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 || 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);
1461 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1462 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1464 error ("new declaration %q#D", newdecl);
1465 error ("ambiguates old declaration %q+#D", olddecl);
1466 return error_mark_node;
1473 error ("conflicting declaration %q#D", newdecl);
1474 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1475 return error_mark_node;
1478 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1479 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1480 && (!DECL_TEMPLATE_INFO (newdecl)
1481 || (DECL_TI_TEMPLATE (newdecl)
1482 != DECL_TI_TEMPLATE (olddecl))))
1483 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1484 && (!DECL_TEMPLATE_INFO (olddecl)
1485 || (DECL_TI_TEMPLATE (olddecl)
1486 != DECL_TI_TEMPLATE (newdecl))))))
1487 /* It's OK to have a template specialization and a non-template
1488 with the same type, or to have specializations of two
1489 different templates with the same type. Note that if one is a
1490 specialization, and the other is an instantiation of the same
1491 template, that we do not exit at this point. That situation
1492 can occur if we instantiate a template class, and then
1493 specialize one of its methods. This situation is valid, but
1494 the declarations must be merged in the usual way. */
1496 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1497 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1498 && !DECL_USE_TEMPLATE (newdecl))
1499 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1500 && !DECL_USE_TEMPLATE (olddecl))))
1501 /* One of the declarations is a template instantiation, and the
1502 other is not a template at all. That's OK. */
1504 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1506 /* In [namespace.alias] we have:
1508 In a declarative region, a namespace-alias-definition can be
1509 used to redefine a namespace-alias declared in that declarative
1510 region to refer only to the namespace to which it already
1513 Therefore, if we encounter a second alias directive for the same
1514 alias, we can just ignore the second directive. */
1515 if (DECL_NAMESPACE_ALIAS (newdecl)
1516 && (DECL_NAMESPACE_ALIAS (newdecl)
1517 == DECL_NAMESPACE_ALIAS (olddecl)))
1519 /* [namespace.alias]
1521 A namespace-name or namespace-alias shall not be declared as
1522 the name of any other entity in the same declarative region.
1523 A namespace-name defined at global scope shall not be
1524 declared as the name of any other entity in any global scope
1526 error ("declaration of namespace %qD conflicts with", newdecl);
1527 error ("previous declaration of namespace %q+D here", olddecl);
1528 return error_mark_node;
1532 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1535 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1536 if (DECL_NAME (olddecl) != NULL_TREE)
1537 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1538 ? "%q+#D previously defined here"
1539 : "%q+#D previously declared here", olddecl);
1540 return error_mark_node;
1542 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1543 && DECL_INITIAL (olddecl) != NULL_TREE
1544 && !prototype_p (TREE_TYPE (olddecl))
1545 && prototype_p (TREE_TYPE (newdecl)))
1547 /* Prototype decl follows defn w/o prototype. */
1548 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1549 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1550 "follows non-prototype definition here");
1552 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1553 || TREE_CODE (olddecl) == VAR_DECL)
1554 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1557 If two declarations of the same function or object
1558 specify different linkage-specifications ..., the program
1559 is ill-formed.... Except for functions with C++ linkage,
1560 a function declaration without a linkage specification
1561 shall not precede the first linkage specification for
1562 that function. A function can be declared without a
1563 linkage specification after an explicit linkage
1564 specification has been seen; the linkage explicitly
1565 specified in the earlier declaration is not affected by
1566 such a function declaration.
1568 DR 563 raises the question why the restrictions on
1569 functions should not also apply to objects. Older
1570 versions of G++ silently ignore the linkage-specification
1578 which is clearly wrong. Therefore, we now treat objects
1580 if (current_lang_depth () == 0)
1582 /* There is no explicit linkage-specification, so we use
1583 the linkage from the previous declaration. */
1584 if (!DECL_LANG_SPECIFIC (newdecl))
1585 retrofit_lang_decl (newdecl);
1586 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1590 error ("previous declaration of %q+#D with %qL linkage",
1591 olddecl, DECL_LANGUAGE (olddecl));
1592 error ("conflicts with new declaration with %qL linkage",
1593 DECL_LANGUAGE (newdecl));
1597 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1599 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1601 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1602 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1605 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1606 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1608 for (; t1 && t1 != void_list_node;
1609 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1610 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1612 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1615 permerror (input_location, "default argument given for parameter %d of %q#D",
1617 permerror (input_location, "after previous specification in %q+#D", olddecl);
1621 error ("default argument given for parameter %d of %q#D",
1623 error ("after previous specification in %q+#D",
1630 /* Do not merge an implicit typedef with an explicit one. In:
1634 typedef class A A __attribute__ ((foo));
1636 the attribute should apply only to the typedef. */
1637 if (TREE_CODE (olddecl) == TYPE_DECL
1638 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1639 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1642 /* If new decl is `static' and an `extern' was seen previously,
1644 warn_extern_redeclared_static (newdecl, olddecl);
1646 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1647 return error_mark_node;
1649 /* We have committed to returning 1 at this point. */
1650 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1652 /* Now that functions must hold information normally held
1653 by field decls, there is extra work to do so that
1654 declaration information does not get destroyed during
1656 if (DECL_VINDEX (olddecl))
1657 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1658 if (DECL_CONTEXT (olddecl))
1659 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1660 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1661 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1662 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1663 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1664 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1665 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1666 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1667 SET_OVERLOADED_OPERATOR_CODE
1668 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1669 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1671 /* Optionally warn about more than one declaration for the same
1672 name, but don't warn about a function declaration followed by a
1674 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1675 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1676 /* Don't warn about extern decl followed by definition. */
1677 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1678 /* Don't warn about friends, let add_friend take care of it. */
1679 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1681 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1682 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1685 if (DECL_DELETED_FN (newdecl))
1687 error ("deleted definition of %qD", newdecl);
1688 error ("after previous declaration %q+D", olddecl);
1692 /* Deal with C++: must preserve virtual function table size. */
1693 if (TREE_CODE (olddecl) == TYPE_DECL)
1695 tree newtype = TREE_TYPE (newdecl);
1696 tree oldtype = TREE_TYPE (olddecl);
1698 if (newtype != error_mark_node && oldtype != error_mark_node
1699 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1700 CLASSTYPE_FRIEND_CLASSES (newtype)
1701 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1703 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1706 /* Copy all the DECL_... slots specified in the new decl
1707 except for any that we copy here from the old type. */
1708 DECL_ATTRIBUTES (newdecl)
1709 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1711 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1715 old_result = DECL_TEMPLATE_RESULT (olddecl);
1716 new_result = DECL_TEMPLATE_RESULT (newdecl);
1717 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1718 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1719 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1720 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1722 DECL_ATTRIBUTES (old_result)
1723 = (*targetm.merge_decl_attributes) (old_result, new_result);
1725 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1727 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1728 && DECL_INITIAL (new_result))
1730 if (DECL_INITIAL (old_result))
1731 DECL_UNINLINABLE (old_result) = 1;
1733 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1734 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1735 DECL_NOT_REALLY_EXTERN (old_result)
1736 = DECL_NOT_REALLY_EXTERN (new_result);
1737 DECL_INTERFACE_KNOWN (old_result)
1738 = DECL_INTERFACE_KNOWN (new_result);
1739 DECL_DECLARED_INLINE_P (old_result)
1740 = DECL_DECLARED_INLINE_P (new_result);
1741 DECL_DISREGARD_INLINE_LIMITS (old_result)
1742 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1747 DECL_DECLARED_INLINE_P (old_result)
1748 |= DECL_DECLARED_INLINE_P (new_result);
1749 DECL_DISREGARD_INLINE_LIMITS (old_result)
1750 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1751 check_redeclaration_exception_specification (newdecl, olddecl);
1755 /* If the new declaration is a definition, update the file and
1756 line information on the declaration, and also make
1757 the old declaration the same definition. */
1758 if (DECL_INITIAL (new_result) != NULL_TREE)
1760 DECL_SOURCE_LOCATION (olddecl)
1761 = DECL_SOURCE_LOCATION (old_result)
1762 = DECL_SOURCE_LOCATION (newdecl);
1763 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1764 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1767 DECL_ARGUMENTS (old_result)
1768 = DECL_ARGUMENTS (new_result);
1769 for (parm = DECL_ARGUMENTS (old_result); parm;
1770 parm = DECL_CHAIN (parm))
1771 DECL_CONTEXT (parm) = old_result;
1780 /* Automatically handles default parameters. */
1781 tree oldtype = TREE_TYPE (olddecl);
1784 /* Merge the data types specified in the two decls. */
1785 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1787 /* If merge_types produces a non-typedef type, just use the old type. */
1788 if (TREE_CODE (newdecl) == TYPE_DECL
1789 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1792 if (TREE_CODE (newdecl) == VAR_DECL)
1794 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1795 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1796 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1797 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1798 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1799 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1801 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1802 if (DECL_LANG_SPECIFIC (olddecl)
1803 && CP_DECL_THREADPRIVATE_P (olddecl))
1805 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1806 if (!DECL_LANG_SPECIFIC (newdecl))
1807 retrofit_lang_decl (newdecl);
1809 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1810 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1814 /* Do this after calling `merge_types' so that default
1815 parameters don't confuse us. */
1816 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1817 check_redeclaration_exception_specification (newdecl, olddecl);
1818 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1820 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1821 check_default_args (newdecl);
1823 /* Lay the type out, unless already done. */
1824 if (! same_type_p (newtype, oldtype)
1825 && TREE_TYPE (newdecl) != error_mark_node
1826 && !(processing_template_decl && uses_template_parms (newdecl)))
1827 layout_type (TREE_TYPE (newdecl));
1829 if ((TREE_CODE (newdecl) == VAR_DECL
1830 || TREE_CODE (newdecl) == PARM_DECL
1831 || TREE_CODE (newdecl) == RESULT_DECL
1832 || TREE_CODE (newdecl) == FIELD_DECL
1833 || TREE_CODE (newdecl) == TYPE_DECL)
1834 && !(processing_template_decl && uses_template_parms (newdecl)))
1835 layout_decl (newdecl, 0);
1837 /* Merge the type qualifiers. */
1838 if (TREE_READONLY (newdecl))
1839 TREE_READONLY (olddecl) = 1;
1840 if (TREE_THIS_VOLATILE (newdecl))
1841 TREE_THIS_VOLATILE (olddecl) = 1;
1842 if (TREE_NOTHROW (newdecl))
1843 TREE_NOTHROW (olddecl) = 1;
1845 /* Merge deprecatedness. */
1846 if (TREE_DEPRECATED (newdecl))
1847 TREE_DEPRECATED (olddecl) = 1;
1849 /* Preserve function specific target and optimization options */
1850 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1852 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1853 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1854 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1855 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1857 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1858 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1859 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1860 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1863 /* Merge the initialization information. */
1864 if (DECL_INITIAL (newdecl) == NULL_TREE
1865 && DECL_INITIAL (olddecl) != NULL_TREE)
1867 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1868 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1869 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1871 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1872 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1876 /* Merge the section attribute.
1877 We want to issue an error if the sections conflict but that must be
1878 done later in decl_attributes since we are called before attributes
1880 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1881 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1883 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1885 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1886 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1887 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1888 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1889 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1890 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1891 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1892 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1893 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1894 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1895 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1896 /* Keep the old RTL. */
1897 COPY_DECL_RTL (olddecl, newdecl);
1899 else if (TREE_CODE (newdecl) == VAR_DECL
1900 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1902 /* Keep the old RTL. We cannot keep the old RTL if the old
1903 declaration was for an incomplete object and the new
1904 declaration is not since many attributes of the RTL will
1906 COPY_DECL_RTL (olddecl, newdecl);
1909 /* If cannot merge, then use the new type and qualifiers,
1910 and don't preserve the old rtl. */
1913 /* Clean out any memory we had of the old declaration. */
1914 tree oldstatic = value_member (olddecl, static_aggregates);
1916 TREE_VALUE (oldstatic) = error_mark_node;
1918 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1919 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1920 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1921 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1924 /* Merge the storage class information. */
1925 merge_weak (newdecl, olddecl);
1927 if (DECL_ONE_ONLY (olddecl))
1928 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1930 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1931 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1932 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1933 if (! DECL_EXTERNAL (olddecl))
1934 DECL_EXTERNAL (newdecl) = 0;
1936 new_template_info = NULL_TREE;
1937 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1939 bool new_redefines_gnu_inline = false;
1941 if (new_defines_function
1942 && ((DECL_INTERFACE_KNOWN (olddecl)
1943 && TREE_CODE (olddecl) == FUNCTION_DECL)
1944 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1945 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1946 == FUNCTION_DECL))))
1950 if (TREE_CODE (fn) == TEMPLATE_DECL)
1951 fn = DECL_TEMPLATE_RESULT (olddecl);
1953 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1956 if (!new_redefines_gnu_inline)
1958 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1959 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1960 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1962 DECL_TEMPLATE_INSTANTIATED (newdecl)
1963 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1964 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1966 /* If the OLDDECL is an instantiation and/or specialization,
1967 then the NEWDECL must be too. But, it may not yet be marked
1968 as such if the caller has created NEWDECL, but has not yet
1969 figured out that it is a redeclaration. */
1970 if (!DECL_USE_TEMPLATE (newdecl))
1971 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1973 /* Don't really know how much of the language-specific
1974 values we should copy from old to new. */
1975 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1976 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1977 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1978 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1980 if (LANG_DECL_HAS_MIN (newdecl))
1982 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1983 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1984 if (DECL_TEMPLATE_INFO (newdecl))
1985 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1986 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1988 /* Only functions have these fields. */
1989 if (TREE_CODE (newdecl) == FUNCTION_DECL
1990 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1992 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1993 olddecl_friend = DECL_FRIEND_P (olddecl);
1994 hidden_friend = (DECL_ANTICIPATED (olddecl)
1995 && DECL_HIDDEN_FRIEND_P (olddecl)
1996 && newdecl_is_friend);
1997 DECL_BEFRIENDING_CLASSES (newdecl)
1998 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1999 DECL_BEFRIENDING_CLASSES (olddecl));
2000 /* DECL_THUNKS is only valid for virtual functions,
2001 otherwise it is a DECL_FRIEND_CONTEXT. */
2002 if (DECL_VIRTUAL_P (newdecl))
2003 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2005 /* Only variables have this field. */
2006 else if (TREE_CODE (newdecl) == VAR_DECL
2007 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2008 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2011 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2015 /* Merge parameter attributes. */
2016 tree oldarg, newarg;
2017 for (oldarg = DECL_ARGUMENTS(olddecl),
2018 newarg = DECL_ARGUMENTS(newdecl);
2020 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2021 DECL_ATTRIBUTES (newarg)
2022 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2023 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2026 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2027 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2029 /* If newdecl is not a specialization, then it is not a
2030 template-related function at all. And that means that we
2031 should have exited above, returning 0. */
2032 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2034 if (DECL_ODR_USED (olddecl))
2035 /* From [temp.expl.spec]:
2037 If a template, a member template or the member of a class
2038 template is explicitly specialized then that
2039 specialization shall be declared before the first use of
2040 that specialization that would cause an implicit
2041 instantiation to take place, in every translation unit in
2042 which such a use occurs. */
2043 error ("explicit specialization of %qD after first use",
2046 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2048 /* Don't propagate visibility from the template to the
2049 specialization here. We'll do that in determine_visibility if
2051 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2053 /* [temp.expl.spec/14] We don't inline explicit specialization
2054 just because the primary template says so. */
2056 else if (new_defines_function && DECL_INITIAL (olddecl))
2058 /* Never inline re-defined extern inline functions.
2059 FIXME: this could be better handled by keeping both
2060 function as separate declarations. */
2061 DECL_UNINLINABLE (newdecl) = 1;
2065 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2066 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2068 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2070 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2071 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2073 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2074 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2075 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2076 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2079 /* Preserve abstractness on cloned [cd]tors. */
2080 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2082 /* Update newdecl's parms to point at olddecl. */
2083 for (parm = DECL_ARGUMENTS (newdecl); parm;
2084 parm = DECL_CHAIN (parm))
2085 DECL_CONTEXT (parm) = olddecl;
2089 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2090 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2091 COPY_DECL_RTL (newdecl, olddecl);
2093 if (! types_match || new_defines_function)
2095 /* These need to be copied so that the names are available.
2096 Note that if the types do match, we'll preserve inline
2097 info and other bits, but if not, we won't. */
2098 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2099 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2101 if (new_defines_function)
2102 /* If defining a function declared with other language
2103 linkage, use the previously declared language linkage. */
2104 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2105 else if (types_match)
2107 /* If redeclaring a builtin function, and not a definition,
2108 it stays built in. */
2109 if (DECL_BUILT_IN (olddecl))
2111 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2112 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2113 /* If we're keeping the built-in definition, keep the rtl,
2114 regardless of declaration matches. */
2115 COPY_DECL_RTL (olddecl, newdecl);
2118 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2119 /* Don't clear out the arguments if we're just redeclaring a
2121 if (DECL_ARGUMENTS (olddecl))
2122 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2125 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2126 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2128 /* Now preserve various other info from the definition. */
2129 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2130 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2131 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2132 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2134 /* Warn about conflicting visibility specifications. */
2135 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2136 && DECL_VISIBILITY_SPECIFIED (newdecl)
2137 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2139 warning_at (input_location, OPT_Wattributes,
2140 "%q+D: visibility attribute ignored because it", newdecl);
2141 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2142 "conflicts with previous declaration here");
2144 /* Choose the declaration which specified visibility. */
2145 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2147 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2148 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2150 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2151 so keep this behavior. */
2152 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2154 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2155 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2157 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2158 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2159 if (TREE_CODE (newdecl) == FIELD_DECL)
2160 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2162 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2163 with that from NEWDECL below. */
2164 if (DECL_LANG_SPECIFIC (olddecl))
2166 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2167 != DECL_LANG_SPECIFIC (newdecl));
2168 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2171 /* Merge the USED information. */
2172 if (TREE_USED (olddecl))
2173 TREE_USED (newdecl) = 1;
2174 else if (TREE_USED (newdecl))
2175 TREE_USED (olddecl) = 1;
2176 if (TREE_CODE (newdecl) == VAR_DECL)
2178 if (DECL_READ_P (olddecl))
2179 DECL_READ_P (newdecl) = 1;
2180 else if (DECL_READ_P (newdecl))
2181 DECL_READ_P (olddecl) = 1;
2183 if (DECL_PRESERVE_P (olddecl))
2184 DECL_PRESERVE_P (newdecl) = 1;
2185 else if (DECL_PRESERVE_P (newdecl))
2186 DECL_PRESERVE_P (olddecl) = 1;
2188 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2192 function_size = sizeof (struct tree_decl_common);
2194 memcpy ((char *) olddecl + sizeof (struct tree_common),
2195 (char *) newdecl + sizeof (struct tree_common),
2196 function_size - sizeof (struct tree_common));
2198 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2199 (char *) newdecl + sizeof (struct tree_decl_common),
2200 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2201 if (new_template_info)
2202 /* If newdecl is a template instantiation, it is possible that
2203 the following sequence of events has occurred:
2205 o A friend function was declared in a class template. The
2206 class template was instantiated.
2208 o The instantiation of the friend declaration was
2209 recorded on the instantiation list, and is newdecl.
2211 o Later, however, instantiate_class_template called pushdecl
2212 on the newdecl to perform name injection. But, pushdecl in
2213 turn called duplicate_decls when it discovered that another
2214 declaration of a global function with the same name already
2217 o Here, in duplicate_decls, we decided to clobber newdecl.
2219 If we're going to do that, we'd better make sure that
2220 olddecl, and not newdecl, is on the list of
2221 instantiations so that if we try to do the instantiation
2222 again we won't get the clobbered declaration. */
2223 reregister_specialization (newdecl,
2229 size_t size = tree_code_size (TREE_CODE (olddecl));
2230 memcpy ((char *) olddecl + sizeof (struct tree_common),
2231 (char *) newdecl + sizeof (struct tree_common),
2232 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2233 switch (TREE_CODE (olddecl))
2243 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2244 (char *) newdecl + sizeof (struct tree_decl_common),
2245 size - sizeof (struct tree_decl_common)
2246 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2250 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2251 (char *) newdecl + sizeof (struct tree_decl_common),
2252 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2253 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2257 DECL_UID (olddecl) = olddecl_uid;
2259 DECL_FRIEND_P (olddecl) = 1;
2262 DECL_ANTICIPATED (olddecl) = 1;
2263 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2266 /* NEWDECL contains the merged attribute lists.
2267 Update OLDDECL to be the same. */
2268 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2270 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2271 so that encode_section_info has a chance to look at the new decl
2272 flags and attributes. */
2273 if (DECL_RTL_SET_P (olddecl)
2274 && (TREE_CODE (olddecl) == FUNCTION_DECL
2275 || (TREE_CODE (olddecl) == VAR_DECL
2276 && TREE_STATIC (olddecl))))
2277 make_decl_rtl (olddecl);
2279 /* The NEWDECL will no longer be needed. Because every out-of-class
2280 declaration of a member results in a call to duplicate_decls,
2281 freeing these nodes represents in a significant savings. */
2287 /* Return zero if the declaration NEWDECL is valid
2288 when the declaration OLDDECL (assumed to be for the same name)
2289 has already been seen.
2290 Otherwise return an error message format string with a %s
2291 where the identifier should go. */
2294 redeclaration_error_message (tree newdecl, tree olddecl)
2296 if (TREE_CODE (newdecl) == TYPE_DECL)
2298 /* Because C++ can put things into name space for free,
2299 constructs like "typedef struct foo { ... } foo"
2300 would look like an erroneous redeclaration. */
2301 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2304 return G_("redefinition of %q#D");
2306 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2308 /* If this is a pure function, its olddecl will actually be
2309 the original initialization to `0' (which we force to call
2310 abort()). Don't complain about redefinition in this case. */
2311 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2312 && DECL_INITIAL (olddecl) == NULL_TREE)
2315 /* If both functions come from different namespaces, this is not
2316 a redeclaration - this is a conflict with a used function. */
2317 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2318 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2319 && ! decls_match (olddecl, newdecl))
2320 return G_("%qD conflicts with used function");
2322 /* We'll complain about linkage mismatches in
2323 warn_extern_redeclared_static. */
2325 /* Defining the same name twice is no good. */
2326 if (DECL_INITIAL (olddecl) != NULL_TREE
2327 && DECL_INITIAL (newdecl) != NULL_TREE)
2329 if (DECL_NAME (olddecl) == NULL_TREE)
2330 return G_("%q#D not declared in class");
2331 else if (!GNU_INLINE_P (olddecl)
2332 || GNU_INLINE_P (newdecl))
2333 return G_("redefinition of %q#D");
2336 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2338 bool olda = GNU_INLINE_P (olddecl);
2339 bool newa = GNU_INLINE_P (newdecl);
2344 return G_("%q+D redeclared inline with "
2345 "%<gnu_inline%> attribute");
2347 return G_("%q+D redeclared inline without "
2348 "%<gnu_inline%> attribute");
2354 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2358 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2360 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2361 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2362 return G_("redefinition of %q#D");
2366 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2367 || (DECL_TEMPLATE_RESULT (newdecl)
2368 == DECL_TEMPLATE_RESULT (olddecl)))
2371 nt = DECL_TEMPLATE_RESULT (newdecl);
2372 if (DECL_TEMPLATE_INFO (nt))
2373 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2374 ot = DECL_TEMPLATE_RESULT (olddecl);
2375 if (DECL_TEMPLATE_INFO (ot))
2376 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2377 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2378 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2379 return G_("redefinition of %q#D");
2381 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2383 bool olda = GNU_INLINE_P (ot);
2384 bool newa = GNU_INLINE_P (nt);
2389 return G_("%q+D redeclared inline with "
2390 "%<gnu_inline%> attribute");
2392 return G_("%q+D redeclared inline without "
2393 "%<gnu_inline%> attribute");
2397 /* Core issue #226 (C++0x):
2399 If a friend function template declaration specifies a
2400 default template-argument, that declaration shall be a
2401 definition and shall be the only declaration of the
2402 function template in the translation unit. */
2403 if ((cxx_dialect != cxx98)
2404 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2405 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2406 /*is_primary=*/1, /*is_partial=*/0,
2407 /*is_friend_decl=*/2))
2408 return G_("redeclaration of friend %q#D "
2409 "may not have default template arguments");
2413 else if (TREE_CODE (newdecl) == VAR_DECL
2414 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2415 && (! DECL_LANG_SPECIFIC (olddecl)
2416 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2417 || DECL_THREAD_LOCAL_P (newdecl)))
2419 /* Only variables can be thread-local, and all declarations must
2420 agree on this property. */
2421 if (DECL_THREAD_LOCAL_P (newdecl))
2422 return G_("thread-local declaration of %q#D follows "
2423 "non-thread-local declaration");
2425 return G_("non-thread-local declaration of %q#D follows "
2426 "thread-local declaration");
2428 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2430 /* The objects have been declared at namespace scope. If either
2431 is a member of an anonymous union, then this is an invalid
2432 redeclaration. For example:
2438 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2439 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2440 return G_("redeclaration of %q#D");
2441 /* If at least one declaration is a reference, there is no
2442 conflict. For example:
2448 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2450 /* Reject two definitions. */
2451 return G_("redefinition of %q#D");
2455 /* Objects declared with block scope: */
2456 /* Reject two definitions, and reject a definition
2457 together with an external reference. */
2458 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2459 return G_("redeclaration of %q#D");
2464 /* Hash and equality functions for the named_label table. */
2467 named_label_entry_hash (const void *data)
2469 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2470 return DECL_UID (ent->label_decl);
2474 named_label_entry_eq (const void *a, const void *b)
2476 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2477 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2478 return ent_a->label_decl == ent_b->label_decl;
2481 /* Create a new label, named ID. */
2484 make_label_decl (tree id, int local_p)
2486 struct named_label_entry *ent;
2490 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2492 DECL_CONTEXT (decl) = current_function_decl;
2493 DECL_MODE (decl) = VOIDmode;
2494 C_DECLARED_LABEL_FLAG (decl) = local_p;
2496 /* Say where one reference is to the label, for the sake of the
2497 error if it is not defined. */
2498 DECL_SOURCE_LOCATION (decl) = input_location;
2500 /* Record the fact that this identifier is bound to this label. */
2501 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2503 /* Create the label htab for the function on demand. */
2505 named_labels = htab_create_ggc (13, named_label_entry_hash,
2506 named_label_entry_eq, NULL);
2508 /* Record this label on the list of labels used in this function.
2509 We do this before calling make_label_decl so that we get the
2510 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2511 ent = ggc_alloc_cleared_named_label_entry ();
2512 ent->label_decl = decl;
2514 slot = htab_find_slot (named_labels, ent, INSERT);
2515 gcc_assert (*slot == NULL);
2521 /* Look for a label named ID in the current function. If one cannot
2522 be found, create one. (We keep track of used, but undefined,
2523 labels, and complain about them at the end of a function.) */
2526 lookup_label (tree id)
2530 timevar_push (TV_NAME_LOOKUP);
2531 /* You can't use labels at global scope. */
2532 if (current_function_decl == NULL_TREE)
2534 error ("label %qE referenced outside of any function", id);
2535 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2538 /* See if we've already got this label. */
2539 decl = IDENTIFIER_LABEL_VALUE (id);
2540 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2541 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2543 decl = make_label_decl (id, /*local_p=*/0);
2544 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2547 /* Declare a local label named ID. */
2550 declare_local_label (tree id)
2553 cp_label_binding *bind;
2555 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2556 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2557 bind = VEC_safe_push (cp_label_binding, gc,
2558 current_binding_level->shadowed_labels, NULL);
2559 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2561 decl = make_label_decl (id, /*local_p=*/1);
2567 /* Returns nonzero if it is ill-formed to jump past the declaration of
2568 DECL. Returns 2 if it's also a real problem. */
2571 decl_jump_unsafe (tree decl)
2573 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2574 with automatic storage duration is not in scope to a point where it is
2575 in scope is ill-formed unless the variable has scalar type, class type
2576 with a trivial default constructor and a trivial destructor, a
2577 cv-qualified version of one of these types, or an array of one of the
2578 preceding types and is declared without an initializer (8.5). */
2579 tree type = TREE_TYPE (decl);
2581 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2582 || type == error_mark_node)
2585 type = strip_array_types (type);
2587 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2588 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2591 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2597 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2600 identify_goto (tree decl, const location_t *locus)
2603 permerror (input_location, "jump to label %qD", decl);
2605 permerror (input_location, "jump to case label");
2607 permerror (*locus, " from here");
2610 /* Check that a single previously seen jump to a newly defined label
2611 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2612 the jump context; NAMES are the names in scope in LEVEL at the jump
2613 context; LOCUS is the source position of the jump or 0. Returns
2614 true if all is well. */
2617 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2618 bool exited_omp, const location_t *locus)
2620 struct cp_binding_level *b;
2621 bool identified = false, saw_eh = false, saw_omp = false;
2625 identify_goto (decl, locus);
2626 error (" exits OpenMP structured block");
2627 identified = saw_omp = true;
2630 for (b = current_binding_level; b ; b = b->level_chain)
2632 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2634 for (new_decls = b->names; new_decls != old_decls;
2635 new_decls = DECL_CHAIN (new_decls))
2637 int problem = decl_jump_unsafe (new_decls);
2643 identify_goto (decl, locus);
2647 error (" crosses initialization of %q+#D", new_decls);
2649 permerror (input_location, " enters scope of %q+#D which has "
2650 "non-trivial destructor", new_decls);
2655 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2659 identify_goto (decl, locus);
2662 if (b->kind == sk_try)
2663 error (" enters try block");
2665 error (" enters catch block");
2668 if (b->kind == sk_omp && !saw_omp)
2672 identify_goto (decl, locus);
2675 error (" enters OpenMP structured block");
2684 check_previous_goto (tree decl, struct named_label_use_entry *use)
2686 check_previous_goto_1 (decl, use->binding_level,
2687 use->names_in_scope, use->in_omp_scope,
2688 &use->o_goto_locus);
2692 check_switch_goto (struct cp_binding_level* level)
2694 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2697 /* Check that a new jump to a label DECL is OK. Called by
2698 finish_goto_stmt. */
2701 check_goto (tree decl)
2703 struct named_label_entry *ent, dummy;
2704 bool saw_catch = false, identified = false;
2708 /* We can't know where a computed goto is jumping.
2709 So we assume that it's OK. */
2710 if (TREE_CODE (decl) != LABEL_DECL)
2713 /* We didn't record any information about this label when we created it,
2714 and there's not much point since it's trivial to analyze as a return. */
2715 if (decl == cdtor_label)
2718 dummy.label_decl = decl;
2719 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2720 gcc_assert (ent != NULL);
2722 /* If the label hasn't been defined yet, defer checking. */
2723 if (! DECL_INITIAL (decl))
2725 struct named_label_use_entry *new_use;
2727 /* Don't bother creating another use if the last goto had the
2728 same data, and will therefore create the same set of errors. */
2730 && ent->uses->names_in_scope == current_binding_level->names)
2733 new_use = ggc_alloc_named_label_use_entry ();
2734 new_use->binding_level = current_binding_level;
2735 new_use->names_in_scope = current_binding_level->names;
2736 new_use->o_goto_locus = input_location;
2737 new_use->in_omp_scope = false;
2739 new_use->next = ent->uses;
2740 ent->uses = new_use;
2744 if (ent->in_try_scope || ent->in_catch_scope
2745 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2747 permerror (input_location, "jump to label %q+D", decl);
2748 permerror (input_location, " from here");
2752 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2754 int u = decl_jump_unsafe (bad);
2756 if (u > 1 && DECL_ARTIFICIAL (bad))
2758 /* Can't skip init of __exception_info. */
2759 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2763 error (" skips initialization of %q+#D", bad);
2765 permerror (input_location, " enters scope of %q+#D which has "
2766 "non-trivial destructor", bad);
2769 if (ent->in_try_scope)
2770 error (" enters try block");
2771 else if (ent->in_catch_scope && !saw_catch)
2772 error (" enters catch block");
2774 if (ent->in_omp_scope)
2775 error (" enters OpenMP structured block");
2776 else if (flag_openmp)
2778 struct cp_binding_level *b;
2779 for (b = current_binding_level; b ; b = b->level_chain)
2781 if (b == ent->binding_level)
2783 if (b->kind == sk_omp)
2787 permerror (input_location, "jump to label %q+D", decl);
2788 permerror (input_location, " from here");
2791 error (" exits OpenMP structured block");
2798 /* Check that a return is ok wrt OpenMP structured blocks.
2799 Called by finish_return_stmt. Returns true if all is well. */
2802 check_omp_return (void)
2804 struct cp_binding_level *b;
2805 for (b = current_binding_level; b ; b = b->level_chain)
2806 if (b->kind == sk_omp)
2808 error ("invalid exit from OpenMP structured block");
2814 /* Define a label, specifying the location in the source file.
2815 Return the LABEL_DECL node for the label. */
2818 define_label (location_t location, tree name)
2820 struct named_label_entry *ent, dummy;
2821 struct cp_binding_level *p;
2824 timevar_push (TV_NAME_LOOKUP);
2826 decl = lookup_label (name);
2828 dummy.label_decl = decl;
2829 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2830 gcc_assert (ent != NULL);
2832 /* After labels, make any new cleanups in the function go into their
2833 own new (temporary) binding contour. */
2834 for (p = current_binding_level;
2835 p->kind != sk_function_parms;
2837 p->more_cleanups_ok = 0;
2839 if (name == get_identifier ("wchar_t"))
2840 permerror (input_location, "label named wchar_t");
2842 if (DECL_INITIAL (decl) != NULL_TREE)
2844 error ("duplicate label %qD", decl);
2845 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2849 struct named_label_use_entry *use;
2851 /* Mark label as having been defined. */
2852 DECL_INITIAL (decl) = error_mark_node;
2853 /* Say where in the source. */
2854 DECL_SOURCE_LOCATION (decl) = location;
2856 ent->binding_level = current_binding_level;
2857 ent->names_in_scope = current_binding_level->names;
2859 for (use = ent->uses; use ; use = use->next)
2860 check_previous_goto (decl, use);
2864 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2869 struct cp_binding_level *level;
2870 struct cp_switch *next;
2871 /* The SWITCH_STMT being built. */
2873 /* A splay-tree mapping the low element of a case range to the high
2874 element, or NULL_TREE if there is no high element. Used to
2875 determine whether or not a new case label duplicates an old case
2876 label. We need a tree, rather than simply a hash table, because
2877 of the GNU case range extension. */
2881 /* A stack of the currently active switch statements. The innermost
2882 switch statement is on the top of the stack. There is no need to
2883 mark the stack for garbage collection because it is only active
2884 during the processing of the body of a function, and we never
2885 collect at that point. */
2887 static struct cp_switch *switch_stack;
2889 /* Called right after a switch-statement condition is parsed.
2890 SWITCH_STMT is the switch statement being parsed. */
2893 push_switch (tree switch_stmt)
2895 struct cp_switch *p = XNEW (struct cp_switch);
2896 p->level = current_binding_level;
2897 p->next = switch_stack;
2898 p->switch_stmt = switch_stmt;
2899 p->cases = splay_tree_new (case_compare, NULL, NULL);
2906 struct cp_switch *cs = switch_stack;
2907 location_t switch_location;
2909 /* Emit warnings as needed. */
2910 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2911 if (!processing_template_decl)
2912 c_do_switch_warnings (cs->cases, switch_location,
2913 SWITCH_STMT_TYPE (cs->switch_stmt),
2914 SWITCH_STMT_COND (cs->switch_stmt));
2916 splay_tree_delete (cs->cases);
2917 switch_stack = switch_stack->next;
2921 /* Note that we've seen a definition of a case label, and complain if this
2922 is a bad place for one. */
2925 finish_case_label (location_t loc, tree low_value, tree high_value)
2928 struct cp_binding_level *p;
2930 if (processing_template_decl)
2934 /* For templates, just add the case label; we'll do semantic
2935 analysis at instantiation-time. */
2936 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2937 return add_stmt (build_case_label (loc, low_value, high_value, label));
2940 /* Find the condition on which this switch statement depends. */
2941 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2942 if (cond && TREE_CODE (cond) == TREE_LIST)
2943 cond = TREE_VALUE (cond);
2945 if (!check_switch_goto (switch_stack->level))
2946 return error_mark_node;
2949 low_value = cxx_constant_value (low_value);
2951 high_value = cxx_constant_value (high_value);
2953 r = c_add_case_label (loc, switch_stack->cases, cond,
2954 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2955 low_value, high_value);
2957 /* After labels, make any new cleanups in the function go into their
2958 own new (temporary) binding contour. */
2959 for (p = current_binding_level;
2960 p->kind != sk_function_parms;
2962 p->more_cleanups_ok = 0;
2967 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2970 typename_hash (const void* k)
2973 const_tree const t = (const_tree) k;
2975 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2976 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2981 typedef struct typename_info {
2989 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2990 really of type `typename_info*' */
2993 typename_compare (const void * k1, const void * k2)
2995 const_tree const t1 = (const_tree) k1;
2996 const typename_info *const t2 = (const typename_info *) k2;
2998 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2999 && TYPE_CONTEXT (t1) == t2->scope
3000 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3001 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3002 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3005 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3006 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3008 Returns the new TYPENAME_TYPE. */
3010 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3013 build_typename_type (tree context, tree name, tree fullname,
3014 enum tag_types tag_type)
3022 if (typename_htab == NULL)
3023 typename_htab = htab_create_ggc (61, &typename_hash,
3024 &typename_compare, NULL);
3026 ti.scope = FROB_CONTEXT (context);
3028 ti.template_id = fullname;
3029 ti.enum_p = tag_type == enum_type;
3030 ti.class_p = (tag_type == class_type
3031 || tag_type == record_type
3032 || tag_type == union_type);
3033 hash = (htab_hash_pointer (ti.scope)
3034 ^ htab_hash_pointer (ti.name));
3036 /* See if we already have this type. */
3037 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3042 /* Build the TYPENAME_TYPE. */
3043 t = cxx_make_type (TYPENAME_TYPE);
3044 TYPE_CONTEXT (t) = ti.scope;
3045 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3046 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3047 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3049 /* Build the corresponding TYPE_DECL. */
3050 d = build_decl (input_location, TYPE_DECL, name, t);
3051 TYPE_NAME (TREE_TYPE (d)) = d;
3052 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3053 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3054 DECL_ARTIFICIAL (d) = 1;
3056 /* Store it in the hash table. */
3059 /* TYPENAME_TYPEs must always be compared structurally, because
3060 they may or may not resolve down to another type depending on
3061 the currently open classes. */
3062 SET_TYPE_STRUCTURAL_EQUALITY (t);
3068 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3069 provided to name the type. Returns an appropriate type, unless an
3070 error occurs, in which case error_mark_node is returned. If we
3071 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3072 return that, rather than the _TYPE it corresponds to, in other
3073 cases we look through the type decl. If TF_ERROR is set, complain
3074 about errors, otherwise be quiet. */
3077 make_typename_type (tree context, tree name, enum tag_types tag_type,
3078 tsubst_flags_t complain)
3084 if (name == error_mark_node
3085 || context == NULL_TREE
3086 || context == error_mark_node)
3087 return error_mark_node;
3091 if (!(TYPE_LANG_SPECIFIC (name)
3092 && (CLASSTYPE_IS_TEMPLATE (name)
3093 || CLASSTYPE_USE_TEMPLATE (name))))
3094 name = TYPE_IDENTIFIER (name);
3096 /* Create a TEMPLATE_ID_EXPR for the type. */
3097 name = build_nt (TEMPLATE_ID_EXPR,
3098 CLASSTYPE_TI_TEMPLATE (name),
3099 CLASSTYPE_TI_ARGS (name));
3101 else if (TREE_CODE (name) == TYPE_DECL)
3102 name = DECL_NAME (name);
3106 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3108 name = TREE_OPERAND (name, 0);
3109 if (TREE_CODE (name) == TEMPLATE_DECL)
3110 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3111 else if (TREE_CODE (name) == OVERLOAD)
3113 error ("%qD is not a type", name);
3114 return error_mark_node;
3117 if (TREE_CODE (name) == TEMPLATE_DECL)
3119 error ("%qD used without template parameters", name);
3120 return error_mark_node;
3122 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3123 gcc_assert (TYPE_P (context));
3125 if (!MAYBE_CLASS_TYPE_P (context))
3127 if (complain & tf_error)
3128 error ("%q#T is not a class", context);
3129 return error_mark_node;
3132 /* When the CONTEXT is a dependent type, NAME could refer to a
3133 dependent base class of CONTEXT. But look inside it anyway
3134 if CONTEXT is a currently open scope, in case it refers to a
3135 member of the current instantiation or a non-dependent base;
3136 lookup will stop when we hit a dependent base. */
3137 if (!dependent_scope_p (context))
3138 /* We should only set WANT_TYPE when we're a nested typename type.
3139 Then we can give better diagnostics if we find a non-type. */
3140 t = lookup_field (context, name, 2, /*want_type=*/true);
3144 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3145 return build_typename_type (context, name, fullname, tag_type);
3147 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3151 if (complain & tf_error)
3152 error (want_template ? "no class template named %q#T in %q#T"
3153 : "no type named %q#T in %q#T", name, context);
3154 return error_mark_node;
3157 /* Pull out the template from an injected-class-name (or multiple). */
3159 t = maybe_get_template_decl_from_type_decl (t);
3161 if (TREE_CODE (t) == TREE_LIST)
3163 if (complain & tf_error)
3165 error ("lookup of %qT in %qT is ambiguous", name, context);
3166 print_candidates (t);
3168 return error_mark_node;
3171 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3173 if (complain & tf_error)
3174 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3176 return error_mark_node;
3178 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3180 if (complain & tf_error)
3181 error ("%<typename %T::%D%> names %q#T, which is not a type",
3183 return error_mark_node;
3186 if (complain & tf_error)
3187 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3189 /* If we are currently parsing a template and if T is a typedef accessed
3190 through CONTEXT then we need to remember and check access of T at
3191 template instantiation time. */
3192 add_typedef_to_current_template_for_access_check (t, context, input_location);
3195 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3197 /*entering_scope=*/0,
3198 tf_warning_or_error | tf_user);
3200 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3206 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3207 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3208 in which case error_mark_node is returned.
3210 If PARM_LIST is non-NULL, also make sure that the template parameter
3211 list of TEMPLATE_DECL matches.
3213 If COMPLAIN zero, don't complain about any errors that occur. */
3216 make_unbound_class_template (tree context, tree name, tree parm_list,
3217 tsubst_flags_t complain)
3223 name = TYPE_IDENTIFIER (name);
3224 else if (DECL_P (name))
3225 name = DECL_NAME (name);
3226 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3228 if (!dependent_type_p (context)
3229 || currently_open_class (context))
3231 tree tmpl = NULL_TREE;
3233 if (MAYBE_CLASS_TYPE_P (context))
3234 tmpl = lookup_field (context, name, 0, false);
3236 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3237 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3239 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3241 if (complain & tf_error)
3242 error ("no class template named %q#T in %q#T", name, context);
3243 return error_mark_node;
3247 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3249 if (complain & tf_error)
3251 error ("template parameters do not match template");
3252 error ("%q+D declared here", tmpl);
3254 return error_mark_node;
3257 if (complain & tf_error)
3258 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3263 /* Build the UNBOUND_CLASS_TEMPLATE. */
3264 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3265 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3266 TREE_TYPE (t) = NULL_TREE;
3267 SET_TYPE_STRUCTURAL_EQUALITY (t);
3269 /* Build the corresponding TEMPLATE_DECL. */
3270 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3271 TYPE_NAME (TREE_TYPE (d)) = d;
3272 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3273 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3274 DECL_ARTIFICIAL (d) = 1;
3275 DECL_TEMPLATE_PARMS (d) = parm_list;
3282 /* Push the declarations of builtin types into the namespace.
3283 RID_INDEX is the index of the builtin type in the array
3284 RID_POINTERS. NAME is the name used when looking up the builtin
3285 type. TYPE is the _TYPE node for the builtin type. */
3288 record_builtin_type (enum rid rid_index,
3292 tree rname = NULL_TREE, tname = NULL_TREE;
3293 tree tdecl = NULL_TREE;
3295 if ((int) rid_index < (int) RID_MAX)
3296 rname = ridpointers[(int) rid_index];
3298 tname = get_identifier (name);
3300 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3301 eliminated. Built-in types should not be looked up name; their
3302 names are keywords that the parser can recognize. However, there
3303 is code in c-common.c that uses identifier_global_value to look
3304 up built-in types by name. */
3307 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3308 DECL_ARTIFICIAL (tdecl) = 1;
3309 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3315 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3316 DECL_ARTIFICIAL (tdecl) = 1;
3318 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3321 if (!TYPE_NAME (type))
3322 TYPE_NAME (type) = tdecl;
3325 debug_hooks->type_decl (tdecl, 0);
3328 /* Record one of the standard Java types.
3329 * Declare it as having the given NAME.
3330 * If SIZE > 0, it is the size of one of the integral types;
3331 * otherwise it is the negative of the size of one of the other types. */
3334 record_builtin_java_type (const char* name, int size)
3339 type = build_nonstandard_integer_type (size, 0);
3340 type = build_distinct_type_copy (type);
3342 else if (size > -32)
3345 /* "__java_char" or ""__java_boolean". */
3346 type = build_nonstandard_integer_type (-size, 1);
3347 type = build_distinct_type_copy (type);
3348 /* Get the signed type cached and attached to the unsigned type,
3349 so it doesn't get garbage-collected at "random" times,
3350 causing potential codegen differences out of different UIDs
3351 and different alias set numbers. */
3352 stype = build_nonstandard_integer_type (-size, 0);
3353 stype = build_distinct_type_copy (stype);
3354 TREE_CHAIN (type) = stype;
3355 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3358 { /* "__java_float" or ""__java_double". */
3359 type = make_node (REAL_TYPE);
3360 TYPE_PRECISION (type) = - size;
3363 record_builtin_type (RID_MAX, name, type);
3364 decl = TYPE_NAME (type);
3366 /* Suppress generate debug symbol entries for these types,
3367 since for normal C++ they are just clutter.
3368 However, push_lang_context undoes this if extern "Java" is seen. */
3369 DECL_IGNORED_P (decl) = 1;
3371 TYPE_FOR_JAVA (type) = 1;
3375 /* Push a type into the namespace so that the back ends ignore it. */
3378 record_unknown_type (tree type, const char* name)
3380 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3381 TYPE_DECL, get_identifier (name), type));
3382 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3383 DECL_IGNORED_P (decl) = 1;
3384 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3385 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3386 TYPE_ALIGN (type) = 1;
3387 TYPE_USER_ALIGN (type) = 0;
3388 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3391 /* A string for which we should create an IDENTIFIER_NODE at
3394 typedef struct predefined_identifier
3396 /* The name of the identifier. */
3397 const char *const name;
3398 /* The place where the IDENTIFIER_NODE should be stored. */
3400 /* Nonzero if this is the name of a constructor or destructor. */
3401 const int ctor_or_dtor_p;
3402 } predefined_identifier;
3404 /* Create all the predefined identifiers. */
3407 initialize_predefined_identifiers (void)
3409 const predefined_identifier *pid;
3411 /* A table of identifiers to create at startup. */
3412 static const predefined_identifier predefined_identifiers[] = {
3413 { "C++", &lang_name_cplusplus, 0 },
3414 { "C", &lang_name_c, 0 },
3415 { "Java", &lang_name_java, 0 },
3416 /* Some of these names have a trailing space so that it is
3417 impossible for them to conflict with names written by users. */
3418 { "__ct ", &ctor_identifier, 1 },
3419 { "__base_ctor ", &base_ctor_identifier, 1 },
3420 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3421 { "__dt ", &dtor_identifier, 1 },
3422 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3423 { "__base_dtor ", &base_dtor_identifier, 1 },
3424 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3425 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3426 { "nelts", &nelts_identifier, 0 },
3427 { THIS_NAME, &this_identifier, 0 },
3428 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3429 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3430 { "_vptr", &vptr_identifier, 0 },
3431 { "__vtt_parm", &vtt_parm_identifier, 0 },
3432 { "::", &global_scope_name, 0 },
3433 { "std", &std_identifier, 0 },
3437 for (pid = predefined_identifiers; pid->name; ++pid)
3439 *pid->node = get_identifier (pid->name);
3440 if (pid->ctor_or_dtor_p)
3441 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3445 /* Create the predefined scalar types of C,
3446 and some nodes representing standard constants (0, 1, (void *)0).
3447 Initialize the global binding level.
3448 Make definitions for built-in primitive functions. */
3451 cxx_init_decl_processing (void)
3454 tree void_ftype_ptr;
3456 build_common_tree_nodes (flag_signed_char);
3458 /* Create all the identifiers we need. */
3459 initialize_predefined_identifiers ();
3461 /* Create the global variables. */
3462 push_to_top_level ();
3464 current_function_decl = NULL_TREE;
3465 current_binding_level = NULL;
3466 /* Enter the global namespace. */
3467 gcc_assert (global_namespace == NULL_TREE);
3468 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3470 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3471 TREE_PUBLIC (global_namespace) = 1;
3472 begin_scope (sk_namespace, global_namespace);
3474 current_lang_name = NULL_TREE;
3476 if (flag_visibility_ms_compat)
3477 default_visibility = VISIBILITY_HIDDEN;
3480 current_lang_name = lang_name_c;
3482 /* Create the `std' namespace. */
3483 push_namespace (std_identifier);
3484 std_node = current_namespace;
3487 c_common_nodes_and_builtins ();
3489 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3490 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3491 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3492 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3493 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3494 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3495 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3496 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3498 integer_two_node = build_int_cst (NULL_TREE, 2);
3500 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3501 truthvalue_type_node = boolean_type_node;
3502 truthvalue_false_node = boolean_false_node;
3503 truthvalue_true_node = boolean_true_node;
3505 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3506 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3507 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3510 record_builtin_type (RID_MAX, NULL, string_type_node);
3513 delta_type_node = ptrdiff_type_node;
3514 vtable_index_type = ptrdiff_type_node;
3516 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3517 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3518 void_ftype_ptr = build_function_type_list (void_type_node,
3519 ptr_type_node, NULL_TREE);
3521 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3523 /* C++ extensions */
3525 unknown_type_node = make_node (LANG_TYPE);
3526 record_unknown_type (unknown_type_node, "unknown type");
3528 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3529 TREE_TYPE (unknown_type_node) = unknown_type_node;
3531 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3533 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3534 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3536 init_list_type_node = make_node (LANG_TYPE);
3537 record_unknown_type (init_list_type_node, "init list");
3540 /* Make sure we get a unique function type, so we can give
3541 its pointer type a name. (This wins for gdb.) */
3542 tree vfunc_type = make_node (FUNCTION_TYPE);
3543 TREE_TYPE (vfunc_type) = integer_type_node;
3544 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3545 layout_type (vfunc_type);
3547 vtable_entry_type = build_pointer_type (vfunc_type);
3549 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3552 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3553 layout_type (vtbl_type_node);
3554 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3555 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3556 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3557 layout_type (vtbl_ptr_type_node);
3558 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3560 push_namespace (get_identifier ("__cxxabiv1"));
3561 abi_node = current_namespace;
3564 global_type_node = make_node (LANG_TYPE);
3565 record_unknown_type (global_type_node, "global type");
3568 current_lang_name = lang_name_cplusplus;
3571 tree newtype, deltype;
3572 tree ptr_ftype_sizetype;
3576 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3577 if (cxx_dialect == cxx98)
3580 tree bad_alloc_type_node;
3581 tree bad_alloc_decl;
3583 push_namespace (std_identifier);
3584 bad_alloc_id = get_identifier ("bad_alloc");
3585 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3586 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3588 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3589 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3593 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3596 new_eh_spec = noexcept_false_spec;
3598 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3599 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3600 push_cp_library_fn (NEW_EXPR, newtype);
3601 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3602 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3603 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3605 nullptr_type_node = make_node (NULLPTR_TYPE);
3606 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3607 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3608 TYPE_UNSIGNED (nullptr_type_node) = 1;
3609 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3610 SET_TYPE_MODE (nullptr_type_node, Pmode);
3611 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3612 nullptr_node = build_int_cst (nullptr_type_node, 0);
3616 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3618 /* Perform other language dependent initializations. */
3619 init_class_processing ();
3620 init_rtti_processing ();
3621 init_template_processing ();
3623 if (flag_exceptions)
3624 init_exception_processing ();
3626 if (! supports_one_only ())
3629 make_fname_decl = cp_make_fname_decl;
3630 start_fname_decls ();
3632 /* Show we use EH for cleanups. */
3633 if (flag_exceptions)
3634 using_eh_for_cleanups ();
3637 /* Generate an initializer for a function naming variable from
3638 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3639 filled in with the type of the init. */
3642 cp_fname_init (const char* name, tree *type_p)
3644 tree domain = NULL_TREE;
3646 tree init = NULL_TREE;
3651 length = strlen (name);
3652 domain = build_index_type (size_int (length));
3653 init = build_string (length + 1, name);
3656 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3657 type = build_cplus_array_type (type, domain);
3662 TREE_TYPE (init) = type;
3664 init = error_mark_node;
3669 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3670 the decl, LOC is the location to give the decl, NAME is the
3671 initialization string and TYPE_DEP indicates whether NAME depended
3672 on the type of the function. We make use of that to detect
3673 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3674 at the point of first use, so we mustn't push the decl now. */
3677 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3679 const char *const name = (type_dep && processing_template_decl
3680 ? NULL : fname_as_string (type_dep));
3682 tree init = cp_fname_init (name, &type);
3683 tree decl = build_decl (loc, VAR_DECL, id, type);
3686 free (CONST_CAST (char *, name));
3688 /* As we're using pushdecl_with_scope, we must set the context. */
3689 DECL_CONTEXT (decl) = current_function_decl;
3690 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3692 TREE_STATIC (decl) = 1;
3693 TREE_READONLY (decl) = 1;
3694 DECL_ARTIFICIAL (decl) = 1;
3696 TREE_USED (decl) = 1;
3698 if (current_function_decl)
3700 struct cp_binding_level *b = current_binding_level;
3701 if (b->kind == sk_function_parms)
3702 return error_mark_node;
3703 while (b->level_chain->kind != sk_function_parms)
3705 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3706 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3707 LOOKUP_ONLYCONVERTING);
3711 DECL_THIS_STATIC (decl) = true;
3712 pushdecl_top_level_and_finish (decl, init);
3719 builtin_function_1 (tree decl, tree context, bool is_global)
3721 tree id = DECL_NAME (decl);
3722 const char *name = IDENTIFIER_POINTER (id);
3724 retrofit_lang_decl (decl);
3726 DECL_ARTIFICIAL (decl) = 1;
3727 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3728 SET_DECL_LANGUAGE (decl, lang_c);
3729 /* Runtime library routines are, by definition, available in an
3730 external shared object. */
3731 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3732 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3734 DECL_CONTEXT (decl) = context;
3737 pushdecl_top_level (decl);
3741 /* A function in the user's namespace should have an explicit
3742 declaration before it is used. Mark the built-in function as
3743 anticipated but not actually declared. */
3744 if (name[0] != '_' || name[1] != '_')
3745 DECL_ANTICIPATED (decl) = 1;
3746 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3748 size_t len = strlen (name);
3750 /* Treat __*_chk fortification functions as anticipated as well,
3751 unless they are __builtin_*. */
3752 if (len > strlen ("___chk")
3753 && memcmp (name + len - strlen ("_chk"),
3754 "_chk", strlen ("_chk") + 1) == 0)
3755 DECL_ANTICIPATED (decl) = 1;
3762 cxx_builtin_function (tree decl)
3764 tree id = DECL_NAME (decl);
3765 const char *name = IDENTIFIER_POINTER (id);
3766 /* All builtins that don't begin with an '_' should additionally
3767 go in the 'std' namespace. */
3770 tree decl2 = copy_node(decl);
3771 push_namespace (std_identifier);
3772 builtin_function_1 (decl2, std_node, false);
3776 return builtin_function_1 (decl, NULL_TREE, false);
3779 /* Like cxx_builtin_function, but guarantee the function is added to the global
3780 scope. This is to allow function specific options to add new machine
3781 dependent builtins when the target ISA changes via attribute((target(...)))
3782 which saves space on program startup if the program does not use non-generic
3786 cxx_builtin_function_ext_scope (tree decl)
3789 tree id = DECL_NAME (decl);
3790 const char *name = IDENTIFIER_POINTER (id);
3791 /* All builtins that don't begin with an '_' should additionally
3792 go in the 'std' namespace. */
3795 tree decl2 = copy_node(decl);
3796 push_namespace (std_identifier);
3797 builtin_function_1 (decl2, std_node, true);
3801 return builtin_function_1 (decl, NULL_TREE, true);
3804 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3805 function. Not called directly. */
3808 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3810 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3811 DECL_EXTERNAL (fn) = 1;
3812 TREE_PUBLIC (fn) = 1;
3813 DECL_ARTIFICIAL (fn) = 1;
3814 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3815 SET_DECL_LANGUAGE (fn, lang_c);
3816 /* Runtime library routines are, by definition, available in an
3817 external shared object. */
3818 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3819 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3823 /* Returns the _DECL for a library function with C linkage.
3824 We assume that such functions never throw; if this is incorrect,
3825 callers should unset TREE_NOTHROW. */
3828 build_library_fn (tree name, tree type)
3830 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3831 TREE_NOTHROW (fn) = 1;
3835 /* Returns the _DECL for a library function with C++ linkage. */
3838 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3840 tree fn = build_library_fn_1 (name, operator_code, type);
3841 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3842 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3843 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3847 /* Like build_library_fn, but takes a C string instead of an
3851 build_library_fn_ptr (const char* name, tree type)
3853 return build_library_fn (get_identifier (name), type);
3856 /* Like build_cp_library_fn, but takes a C string instead of an
3860 build_cp_library_fn_ptr (const char* name, tree type)
3862 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3865 /* Like build_library_fn, but also pushes the function so that we will
3866 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3867 may throw exceptions listed in RAISES. */
3870 push_library_fn (tree name, tree type, tree raises)
3875 type = build_exception_variant (type, raises);
3877 fn = build_library_fn (name, type);
3878 pushdecl_top_level (fn);
3882 /* Like build_cp_library_fn, but also pushes the function so that it
3883 will be found by normal lookup. */
3886 push_cp_library_fn (enum tree_code operator_code, tree type)
3888 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3895 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3899 push_void_library_fn (tree name, tree parmtypes)
3901 tree type = build_function_type (void_type_node, parmtypes);
3902 return push_library_fn (name, type, NULL_TREE);
3905 /* Like push_library_fn, but also note that this function throws
3906 and does not return. Used for __throw_foo and the like. */
3909 push_throw_library_fn (tree name, tree type)
3911 tree fn = push_library_fn (name, type, NULL_TREE);
3912 TREE_THIS_VOLATILE (fn) = 1;
3913 TREE_NOTHROW (fn) = 0;
3917 /* When we call finish_struct for an anonymous union, we create
3918 default copy constructors and such. But, an anonymous union
3919 shouldn't have such things; this function undoes the damage to the
3920 anonymous union type T.
3922 (The reason that we create the synthesized methods is that we don't
3923 distinguish `union { int i; }' from `typedef union { int i; } U'.
3924 The first is an anonymous union; the second is just an ordinary
3928 fixup_anonymous_aggr (tree t)
3932 /* Wipe out memory of synthesized methods. */
3933 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3934 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3935 TYPE_HAS_COPY_CTOR (t) = 0;
3936 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3937 TYPE_HAS_COPY_ASSIGN (t) = 0;
3938 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3940 /* Splice the implicitly generated functions out of the TYPE_METHODS
3942 q = &TYPE_METHODS (t);
3945 if (DECL_ARTIFICIAL (*q))
3946 *q = TREE_CHAIN (*q);
3948 q = &DECL_CHAIN (*q);
3951 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3952 if (TYPE_METHODS (t))
3954 tree decl = TYPE_MAIN_DECL (t);
3956 if (TREE_CODE (t) != UNION_TYPE)
3957 error_at (DECL_SOURCE_LOCATION (decl),
3958 "an anonymous struct cannot have function members");
3960 error_at (DECL_SOURCE_LOCATION (decl),
3961 "an anonymous union cannot have function members");
3964 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3965 assignment operators (because they cannot have these methods themselves).
3966 For anonymous unions this is already checked because they are not allowed
3967 in any union, otherwise we have to check it. */
3968 if (TREE_CODE (t) != UNION_TYPE)
3972 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3973 if (TREE_CODE (field) == FIELD_DECL)
3975 type = TREE_TYPE (field);
3976 if (CLASS_TYPE_P (type))
3978 if (TYPE_NEEDS_CONSTRUCTING (type))
3979 error ("member %q+#D with constructor not allowed "
3980 "in anonymous aggregate", field);
3981 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3982 error ("member %q+#D with destructor not allowed "
3983 "in anonymous aggregate", field);
3984 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3985 error ("member %q+#D with copy assignment operator "
3986 "not allowed in anonymous aggregate", field);
3992 /* Make sure that a declaration with no declarator is well-formed, i.e.
3993 just declares a tagged type or anonymous union.
3995 Returns the type declared; or NULL_TREE if none. */
3998 check_tag_decl (cp_decl_specifier_seq *declspecs)
4000 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4001 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4002 /* If a class, struct, or enum type is declared by the DECLSPECS
4003 (i.e, if a class-specifier, enum-specifier, or non-typename
4004 elaborated-type-specifier appears in the DECLSPECS),
4005 DECLARED_TYPE is set to the corresponding type. */
4006 tree declared_type = NULL_TREE;
4007 bool error_p = false;
4009 if (declspecs->multiple_types_p)
4010 error ("multiple types in one declaration");
4011 else if (declspecs->redefined_builtin_type)
4013 if (!in_system_header)
4014 permerror (input_location, "redeclaration of C++ built-in type %qT",
4015 declspecs->redefined_builtin_type);
4020 && TYPE_P (declspecs->type)
4021 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4022 && MAYBE_CLASS_TYPE_P (declspecs->type))
4023 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4024 declared_type = declspecs->type;
4025 else if (declspecs->type == error_mark_node)
4027 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4028 permerror (input_location, "declaration does not declare anything");
4029 /* Check for an anonymous union. */
4030 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4031 && TYPE_ANONYMOUS_P (declared_type))
4033 /* 7/3 In a simple-declaration, the optional init-declarator-list
4034 can be omitted only when declaring a class (clause 9) or
4035 enumeration (7.2), that is, when the decl-specifier-seq contains
4036 either a class-specifier, an elaborated-type-specifier with
4037 a class-key (9.1), or an enum-specifier. In these cases and
4038 whenever a class-specifier or enum-specifier is present in the
4039 decl-specifier-seq, the identifiers in these specifiers are among
4040 the names being declared by the declaration (as class-name,
4041 enum-names, or enumerators, depending on the syntax). In such
4042 cases, and except for the declaration of an unnamed bit-field (9.6),
4043 the decl-specifier-seq shall introduce one or more names into the
4044 program, or shall redeclare a name introduced by a previous
4045 declaration. [Example:
4046 enum { }; // ill-formed
4047 typedef class { }; // ill-formed
4051 error ("missing type-name in typedef-declaration");
4054 /* Anonymous unions are objects, so they can have specifiers. */;
4055 SET_ANON_AGGR_TYPE_P (declared_type);
4057 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4058 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4063 if (declspecs->specs[(int)ds_inline]
4064 || declspecs->specs[(int)ds_virtual])
4065 error ("%qs can only be specified for functions",
4066 declspecs->specs[(int)ds_inline]
4067 ? "inline" : "virtual");
4069 && (!current_class_type
4070 || current_scope () != current_class_type))
4071 error ("%<friend%> can only be specified inside a class");
4072 else if (declspecs->specs[(int)ds_explicit])
4073 error ("%<explicit%> can only be specified for constructors");
4074 else if (declspecs->storage_class)
4075 error ("a storage class can only be specified for objects "
4077 else if (declspecs->specs[(int)ds_const]
4078 || declspecs->specs[(int)ds_volatile]
4079 || declspecs->specs[(int)ds_restrict]
4080 || declspecs->specs[(int)ds_thread])
4081 error ("qualifiers can only be specified for objects "
4083 else if (saw_typedef)
4084 warning (0, "%<typedef%> was ignored in this declaration");
4085 else if (declspecs->specs[(int) ds_constexpr])
4086 error ("%<constexpr%> cannot be used for type declarations");
4089 return declared_type;
4092 /* Called when a declaration is seen that contains no names to declare.
4093 If its type is a reference to a structure, union or enum inherited
4094 from a containing scope, shadow that tag name for the current scope
4095 with a forward reference.
4096 If its type defines a new named structure or union
4097 or defines an enum, it is valid but we need not do anything here.
4098 Otherwise, it is an error.
4100 C++: may have to grok the declspecs to learn about static,
4101 complain for anonymous unions.
4103 Returns the TYPE declared -- or NULL_TREE if none. */
4106 shadow_tag (cp_decl_specifier_seq *declspecs)
4108 tree t = check_tag_decl (declspecs);
4113 if (declspecs->attributes)
4115 warning (0, "attribute ignored in declaration of %q+#T", t);
4116 warning (0, "attribute for %q+#T must follow the %qs keyword",
4117 t, class_key_or_enum_as_string (t));
4121 if (maybe_process_partial_specialization (t) == error_mark_node)
4124 /* This is where the variables in an anonymous union are
4125 declared. An anonymous union declaration looks like:
4127 because there is no declarator after the union, the parser
4128 sends that declaration here. */
4129 if (ANON_AGGR_TYPE_P (t))
4131 fixup_anonymous_aggr (t);
4133 if (TYPE_FIELDS (t))
4135 tree decl = grokdeclarator (/*declarator=*/NULL,
4136 declspecs, NORMAL, 0, NULL);
4137 finish_anon_union (decl);
4144 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4147 groktypename (cp_decl_specifier_seq *type_specifiers,
4148 const cp_declarator *declarator,
4149 bool is_template_arg)
4153 enum decl_context context
4154 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4155 attrs = type_specifiers->attributes;
4156 type_specifiers->attributes = NULL_TREE;
4157 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4158 if (attrs && type != error_mark_node)
4160 if (CLASS_TYPE_P (type))
4161 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4162 "outside of definition", type);
4163 else if (MAYBE_CLASS_TYPE_P (type))
4164 /* A template type parameter or other dependent type. */
4165 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4166 "type %qT without an associated declaration", type);
4168 cplus_decl_attributes (&type, attrs, 0);
4173 /* Process a DECLARATOR for a function-scope variable declaration,
4174 namespace-scope variable declaration, or function declaration.
4175 (Function definitions go through start_function; class member
4176 declarations appearing in the body of the class go through
4177 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4178 If an error occurs, the error_mark_node is returned instead.
4180 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4181 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4182 for an explicitly defaulted function, or SD_DELETED for an explicitly
4183 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4184 implicitly initialized via a default constructor. ATTRIBUTES and
4185 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4186 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4187 set, the caller is responsible for calling pop_scope. */
4190 start_decl (const cp_declarator *declarator,
4191 cp_decl_specifier_seq *declspecs,
4194 tree prefix_attributes,
4195 tree *pushed_scope_p)
4203 *pushed_scope_p = NULL_TREE;
4205 /* An object declared as __attribute__((deprecated)) suppresses
4206 warnings of uses of other deprecated items. */
4207 if (lookup_attribute ("deprecated", attributes))
4208 deprecated_state = DEPRECATED_SUPPRESS;
4210 attributes = chainon (attributes, prefix_attributes);
4212 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4215 deprecated_state = DEPRECATED_NORMAL;
4217 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4218 || decl == error_mark_node)
4219 return error_mark_node;
4221 context = CP_DECL_CONTEXT (decl);
4222 if (context != global_namespace)
4223 *pushed_scope_p = push_scope (context);
4226 /* Is it valid for this decl to have an initializer at all?
4227 If not, set INITIALIZED to zero, which will indirectly
4228 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4229 switch (TREE_CODE (decl))
4232 error ("typedef %qD is initialized (use decltype instead)", decl);
4233 return error_mark_node;
4236 if (initialized == SD_DELETED)
4237 /* We'll handle the rest of the semantics later, but we need to
4238 set this now so it's visible to duplicate_decls. */
4239 DECL_DELETED_FN (decl) = 1;
4248 if (! toplevel_bindings_p ()
4249 && DECL_EXTERNAL (decl))
4250 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4252 DECL_EXTERNAL (decl) = 0;
4253 if (toplevel_bindings_p ())
4254 TREE_STATIC (decl) = 1;
4256 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4258 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4259 record_key_method_defined (decl);
4261 /* If this is a typedef that names the class for linkage purposes
4262 (7.1.3p8), apply any attributes directly to the type. */
4263 if (TREE_CODE (decl) == TYPE_DECL
4264 && TAGGED_TYPE_P (TREE_TYPE (decl))
4265 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4266 flags = ATTR_FLAG_TYPE_IN_PLACE;
4270 /* Set attributes here so if duplicate decl, will have proper attributes. */
4271 cplus_decl_attributes (&decl, attributes, flags);
4273 /* Dllimported symbols cannot be defined. Static data members (which
4274 can be initialized in-class and dllimported) go through grokfield,
4275 not here, so we don't need to exclude those decls when checking for
4277 if (initialized && DECL_DLLIMPORT_P (decl))
4279 error ("definition of %q#D is marked %<dllimport%>", decl);
4280 DECL_DLLIMPORT_P (decl) = 0;
4283 /* If #pragma weak was used, mark the decl weak now. */
4284 maybe_apply_pragma_weak (decl);
4286 if (TREE_CODE (decl) == FUNCTION_DECL
4287 && DECL_DECLARED_INLINE_P (decl)
4288 && DECL_UNINLINABLE (decl)
4289 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4290 warning (0, "inline function %q+D given attribute noinline", decl);
4292 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4294 if (TREE_CODE (decl) == VAR_DECL)
4296 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4297 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4298 error ("%q#D is not a static member of %q#T", decl, context);
4301 if (DECL_CONTEXT (field) != context)
4303 if (!same_type_p (DECL_CONTEXT (field), context))
4304 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4305 "to be defined as %<%T::%D%>",
4306 DECL_CONTEXT (field), DECL_NAME (decl),
4307 context, DECL_NAME (decl));
4308 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4310 if (processing_specialization
4311 && template_class_depth (context) == 0
4312 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4313 error ("template header not allowed in member definition "
4314 "of explicitly specialized class");
4315 /* Static data member are tricky; an in-class initialization
4316 still doesn't provide a definition, so the in-class
4317 declaration will have DECL_EXTERNAL set, but will have an
4318 initialization. Thus, duplicate_decls won't warn
4319 about this situation, and so we check here. */
4320 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4321 error ("duplicate initialization of %qD", decl);
4322 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4324 if (declspecs->specs[(int) ds_constexpr]
4325 && !DECL_DECLARED_CONSTEXPR_P (field))
4326 error ("%qD declared %<constexpr%> outside its class", field);
4331 tree field = check_classfn (context, decl,
4332 (processing_template_decl
4333 > template_class_depth (context))
4334 ? current_template_parms
4336 if (field && field != error_mark_node
4337 && duplicate_decls (decl, field,
4338 /*newdecl_is_friend=*/false))
4342 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4343 DECL_IN_AGGR_P (decl) = 0;
4344 /* Do not mark DECL as an explicit specialization if it was not
4345 already marked as an instantiation; a declaration should
4346 never be marked as a specialization unless we know what
4347 template is being specialized. */
4348 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4350 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4352 /* [temp.expl.spec] An explicit specialization of a static data
4353 member of a template is a definition if the declaration
4354 includes an initializer; otherwise, it is a declaration.
4356 We check for processing_specialization so this only applies
4357 to the new specialization syntax. */
4358 if (!initialized && processing_specialization)
4359 DECL_EXTERNAL (decl) = 1;
4362 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4363 /* Aliases are definitions. */
4365 permerror (input_location, "declaration of %q#D outside of class is not definition",
4369 was_public = TREE_PUBLIC (decl);
4371 /* Enter this declaration into the symbol table. */
4372 decl = maybe_push_decl (decl);
4374 if (processing_template_decl)
4375 decl = push_template_decl (decl);
4376 if (decl == error_mark_node)
4377 return error_mark_node;
4379 /* Tell the back end to use or not use .common as appropriate. If we say
4380 -fconserve-space, we want this to save .data space, at the expense of
4381 wrong semantics. If we say -fno-conserve-space, we want this to
4382 produce errors about redefs; to do this we force variables into the
4384 if (flag_conserve_space
4385 && TREE_CODE (decl) == VAR_DECL
4386 && TREE_PUBLIC (decl)
4387 && !DECL_THREAD_LOCAL_P (decl)
4388 && !have_global_bss_p ())
4389 DECL_COMMON (decl) = 1;
4391 if (TREE_CODE (decl) == VAR_DECL
4392 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4393 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4395 /* This is a const variable with implicit 'static'. Set
4396 DECL_THIS_STATIC so we can tell it from variables that are
4397 !TREE_PUBLIC because of the anonymous namespace. */
4398 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4399 DECL_THIS_STATIC (decl) = 1;
4402 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4403 start_decl_1 (decl, initialized);
4408 /* Process the declaration of a variable DECL. INITIALIZED is true
4409 iff DECL is explicitly initialized. (INITIALIZED is false if the
4410 variable is initialized via an implicitly-called constructor.)
4411 This function must be called for ordinary variables (including, for
4412 example, implicit instantiations of templates), but must not be
4413 called for template declarations. */
4416 start_decl_1 (tree decl, bool initialized)
4420 bool aggregate_definition_p;
4422 gcc_assert (!processing_template_decl);
4424 if (error_operand_p (decl))
4427 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4429 type = TREE_TYPE (decl);
4430 complete_p = COMPLETE_TYPE_P (type);
4431 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4433 /* If an explicit initializer is present, or if this is a definition
4434 of an aggregate, then we need a complete type at this point.
4435 (Scalars are always complete types, so there is nothing to
4436 check.) This code just sets COMPLETE_P; errors (if necessary)
4437 are issued below. */
4438 if ((initialized || aggregate_definition_p)
4440 && COMPLETE_TYPE_P (complete_type (type)))
4443 /* We will not yet have set TREE_READONLY on DECL if the type
4444 was "const", but incomplete, before this point. But, now, we
4445 have a complete type, so we can try again. */
4446 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4450 /* Is it valid for this decl to have an initializer at all? */
4452 /* Don't allow initializations for incomplete types except for
4453 arrays which might be completed by the initialization. */
4455 ; /* A complete type is ok. */
4456 else if (type_uses_auto (type))
4457 ; /* An auto type is ok. */
4458 else if (TREE_CODE (type) != ARRAY_TYPE)
4460 error ("variable %q#D has initializer but incomplete type", decl);
4461 type = TREE_TYPE (decl) = error_mark_node;
4463 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4465 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4466 error ("elements of array %q#D have incomplete type", decl);
4467 /* else we already gave an error in start_decl. */
4470 else if (aggregate_definition_p && !complete_p)
4472 if (type_uses_auto (type))
4473 error ("declaration of %q#D has no initializer", decl);
4475 error ("aggregate %q#D has incomplete type and cannot be defined",
4477 /* Change the type so that assemble_variable will give
4478 DECL an rtl we can live with: (mem (const_int 0)). */
4479 type = TREE_TYPE (decl) = error_mark_node;
4482 /* Create a new scope to hold this declaration if necessary.
4483 Whether or not a new scope is necessary cannot be determined
4484 until after the type has been completed; if the type is a
4485 specialization of a class template it is not until after
4486 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4487 will be set correctly. */
4488 maybe_push_cleanup_level (type);
4491 /* Handle initialization of references. DECL, TYPE, and INIT have the
4492 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4493 but will be set to a new CLEANUP_STMT if a temporary is created
4494 that must be destroyed subsequently.
4496 Returns an initializer expression to use to initialize DECL, or
4497 NULL if the initialization can be performed statically.
4499 Quotes on semantics can be found in ARM 8.4.3. */
4502 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4506 if (init == NULL_TREE)
4508 if ((DECL_LANG_SPECIFIC (decl) == 0
4509 || DECL_IN_AGGR_P (decl) == 0)
4510 && ! DECL_THIS_EXTERN (decl))
4511 error ("%qD declared as reference but not initialized", decl);
4515 if (TREE_CODE (init) == TREE_LIST)
4516 init = build_x_compound_expr_from_list (init, ELK_INIT,
4517 tf_warning_or_error);
4519 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4520 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4521 /* Note: default conversion is only called in very special cases. */
4522 init = decay_conversion (init);
4524 /* Convert INIT to the reference type TYPE. This may involve the
4525 creation of a temporary, whose lifetime must be the same as that
4526 of the reference. If so, a DECL_EXPR for the temporary will be
4527 added just after the DECL_EXPR for DECL. That's why we don't set
4528 DECL_INITIAL for local references (instead assigning to them
4529 explicitly); we need to allow the temporary to be initialized
4531 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4533 if (tmp == error_mark_node)
4535 else if (tmp == NULL_TREE)
4537 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4541 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4544 DECL_INITIAL (decl) = tmp;
4549 /* Subroutine of check_initializer. We're initializing a DECL of
4550 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4551 extend the lifetime of the underlying array to match that of the decl,
4552 just like for reference initialization. CLEANUP is as for
4553 grok_reference_init. */
4556 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4559 tree aggr_init, array, arrtype;
4560 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4561 if (error_operand_p (init))
4562 return error_mark_node;
4564 aggr_init = TARGET_EXPR_INITIAL (init);
4565 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4566 arrtype = TREE_TYPE (array);
4568 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4569 array = TREE_OPERAND (array, 0);
4570 /* If the array is constant, finish_compound_literal already made it a
4571 static variable and we don't need to do anything here. */
4572 if (decl && TREE_CODE (array) == TARGET_EXPR)
4574 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4575 var = build_address (var);
4576 var = convert (arrtype, var);
4577 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4582 /* Designated initializers in arrays are not supported in GNU C++.
4583 The parser cannot detect this error since it does not know whether
4584 a given brace-enclosed initializer is for a class type or for an
4585 array. This function checks that CE does not use a designated
4586 initializer. If it does, an error is issued. Returns true if CE
4587 is valid, i.e., does not have a designated initializer. */
4590 check_array_designated_initializer (const constructor_elt *ce)
4592 /* Designated initializers for array elements are not supported. */
4595 /* The parser only allows identifiers as designated
4597 if (ce->index == error_mark_node)
4598 error ("name used in a GNU-style designated "
4599 "initializer for an array");
4600 else if (TREE_CODE (ce->index) == INTEGER_CST)
4601 /* An index added by reshape_init. */
4605 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4606 error ("name %qD used in a GNU-style designated "
4607 "initializer for an array", ce->index);
4615 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4616 array until we finish parsing the initializer. If that's the
4617 situation we're in, update DECL accordingly. */
4620 maybe_deduce_size_from_array_init (tree decl, tree init)
4622 tree type = TREE_TYPE (decl);
4624 if (TREE_CODE (type) == ARRAY_TYPE
4625 && TYPE_DOMAIN (type) == NULL_TREE
4626 && TREE_CODE (decl) != TYPE_DECL)
4628 /* do_default is really a C-ism to deal with tentative definitions.
4629 But let's leave it here to ease the eventual merge. */
4630 int do_default = !DECL_EXTERNAL (decl);
4631 tree initializer = init ? init : DECL_INITIAL (decl);
4634 /* Check that there are no designated initializers in INIT, as
4635 those are not supported in GNU C++, and as the middle-end
4636 will crash if presented with a non-numeric designated
4638 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4640 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4641 constructor_elt *ce;
4643 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4644 if (!check_array_designated_initializer (ce))
4650 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4654 error ("initializer fails to determine size of %qD", decl);
4655 TREE_TYPE (decl) = error_mark_node;
4657 else if (failure == 2)
4661 error ("array size missing in %qD", decl);
4662 TREE_TYPE (decl) = error_mark_node;
4664 /* If a `static' var's size isn't known, make it extern as
4665 well as static, so it does not get allocated. If it's not
4666 `static', then don't mark it extern; finish_incomplete_decl
4667 will give it a default size and it will get allocated. */
4668 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4669 DECL_EXTERNAL (decl) = 1;
4671 else if (failure == 3)
4673 error ("zero-size array %qD", decl);
4674 TREE_TYPE (decl) = error_mark_node;
4678 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4680 relayout_decl (decl);
4684 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4685 any appropriate error messages regarding the layout. */
4688 layout_var_decl (tree decl)
4692 type = TREE_TYPE (decl);
4693 if (type == error_mark_node)
4696 /* If we haven't already layed out this declaration, do so now.
4697 Note that we must not call complete type for an external object
4698 because it's type might involve templates that we are not
4699 supposed to instantiate yet. (And it's perfectly valid to say
4700 `extern X x' for some incomplete type `X'.) */
4701 if (!DECL_EXTERNAL (decl))
4702 complete_type (type);
4703 if (!DECL_SIZE (decl)
4704 && TREE_TYPE (decl) != error_mark_node
4705 && (COMPLETE_TYPE_P (type)
4706 || (TREE_CODE (type) == ARRAY_TYPE
4707 && !TYPE_DOMAIN (type)
4708 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4709 layout_decl (decl, 0);
4711 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4713 /* An automatic variable with an incomplete type: that is an error.
4714 Don't talk about array types here, since we took care of that
4715 message in grokdeclarator. */
4716 error ("storage size of %qD isn%'t known", decl);
4717 TREE_TYPE (decl) = error_mark_node;
4720 /* Keep this code around in case we later want to control debug info
4721 based on whether a type is "used". (jason 1999-11-11) */
4723 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4724 /* Let debugger know it should output info for this type. */
4725 note_debug_info_needed (ttype);
4727 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4728 note_debug_info_needed (DECL_CONTEXT (decl));
4731 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4732 && DECL_SIZE (decl) != NULL_TREE
4733 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4735 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4736 constant_expression_warning (DECL_SIZE (decl));
4739 error ("storage size of %qD isn%'t constant", decl);
4740 TREE_TYPE (decl) = error_mark_node;
4745 /* If a local static variable is declared in an inline function, or if
4746 we have a weak definition, we must endeavor to create only one
4747 instance of the variable at link-time. */
4750 maybe_commonize_var (tree decl)
4752 /* Static data in a function with comdat linkage also has comdat
4754 if (TREE_STATIC (decl)
4755 /* Don't mess with __FUNCTION__. */
4756 && ! DECL_ARTIFICIAL (decl)
4757 && DECL_FUNCTION_SCOPE_P (decl)
4758 && vague_linkage_p (DECL_CONTEXT (decl)))
4762 /* With weak symbols, we simply make the variable COMDAT;
4763 that will cause copies in multiple translations units to
4765 comdat_linkage (decl);
4769 if (DECL_INITIAL (decl) == NULL_TREE
4770 || DECL_INITIAL (decl) == error_mark_node)
4772 /* Without weak symbols, we can use COMMON to merge
4773 uninitialized variables. */
4774 TREE_PUBLIC (decl) = 1;
4775 DECL_COMMON (decl) = 1;
4779 /* While for initialized variables, we must use internal
4780 linkage -- which means that multiple copies will not
4782 TREE_PUBLIC (decl) = 0;
4783 DECL_COMMON (decl) = 0;
4784 warning_at (input_location, 0,
4785 "sorry: semantics of inline function static "
4786 "data %q+#D are wrong (you%'ll wind up "
4787 "with multiple copies)", decl);
4788 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4789 " you can work around this by removing "
4794 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4795 /* Set it up again; we might have set DECL_INITIAL since the last
4797 comdat_linkage (decl);
4800 /* Issue an error message if DECL is an uninitialized const variable. */
4803 check_for_uninitialized_const_var (tree decl)
4805 tree type = strip_array_types (TREE_TYPE (decl));
4807 /* ``Unless explicitly declared extern, a const object does not have
4808 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4810 if (TREE_CODE (decl) == VAR_DECL
4811 && TREE_CODE (type) != REFERENCE_TYPE
4812 && CP_TYPE_CONST_P (type)
4813 && (!TYPE_NEEDS_CONSTRUCTING (type)
4814 || !type_has_user_provided_default_constructor (type))
4815 && !DECL_INITIAL (decl))
4817 permerror (DECL_SOURCE_LOCATION (decl),
4818 "uninitialized const %qD", decl);
4820 if (CLASS_TYPE_P (type)
4821 && !type_has_user_provided_default_constructor (type))
4823 tree defaulted_ctor;
4825 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4826 "%q#T has no user-provided default constructor", type);
4827 defaulted_ctor = in_class_defaulted_default_constructor (type);
4829 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4830 "constructor is not user-provided because it is "
4831 "explicitly defaulted in the class body");
4836 /* Structure holding the current initializer being processed by reshape_init.
4837 CUR is a pointer to the current element being processed, END is a pointer
4838 after the last element present in the initializer. */
4839 typedef struct reshape_iterator_t
4841 constructor_elt *cur;
4842 constructor_elt *end;
4845 static tree reshape_init_r (tree, reshape_iter *, bool);
4847 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4848 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4849 initialized. If there are no more such fields, the return value
4853 next_initializable_field (tree field)
4856 && (TREE_CODE (field) != FIELD_DECL
4857 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4858 || DECL_ARTIFICIAL (field)))
4859 field = DECL_CHAIN (field);
4864 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4865 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4866 INTEGER_CST representing the size of the array minus one (the maximum index),
4867 or NULL_TREE if the array was declared without specifying the size. D is
4868 the iterator within the constructor. */
4871 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4874 bool sized_array_p = (max_index != NULL_TREE);
4875 unsigned HOST_WIDE_INT max_index_cst = 0;
4876 unsigned HOST_WIDE_INT index;
4878 /* The initializer for an array is always a CONSTRUCTOR. */
4879 new_init = build_constructor (init_list_type_node, NULL);
4883 /* Minus 1 is used for zero sized arrays. */
4884 if (integer_all_onesp (max_index))
4887 if (host_integerp (max_index, 1))
4888 max_index_cst = tree_low_cst (max_index, 1);
4889 /* sizetype is sign extended, not zero extended. */
4891 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4895 /* Loop until there are no more initializers. */
4897 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4902 check_array_designated_initializer (d->cur);
4903 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4904 if (elt_init == error_mark_node)
4905 return error_mark_node;
4906 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4907 size_int (index), elt_init);
4908 if (!TREE_CONSTANT (elt_init))
4909 TREE_CONSTANT (new_init) = false;
4915 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4916 Parameters are the same of reshape_init_r. */
4919 reshape_init_array (tree type, reshape_iter *d)
4921 tree max_index = NULL_TREE;
4923 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4925 if (TYPE_DOMAIN (type))
4926 max_index = array_type_nelts (type);
4928 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4931 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4932 Parameters are the same of reshape_init_r. */
4935 reshape_init_vector (tree type, reshape_iter *d)
4937 tree max_index = NULL_TREE;
4939 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4941 if (COMPOUND_LITERAL_P (d->cur->value))
4943 tree value = d->cur->value;
4944 if (!same_type_p (TREE_TYPE (value), type))
4946 error ("invalid type %qT as initializer for a vector of type %qT",
4947 TREE_TYPE (d->cur->value), type);
4948 value = error_mark_node;
4954 /* For a vector, we initialize it as an array of the appropriate size. */
4955 if (TREE_CODE (type) == VECTOR_TYPE)
4956 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4958 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4961 /* Subroutine of reshape_init_r, processes the initializers for classes
4962 or union. Parameters are the same of reshape_init_r. */
4965 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4970 gcc_assert (CLASS_TYPE_P (type));
4972 /* The initializer for a class is always a CONSTRUCTOR. */
4973 new_init = build_constructor (init_list_type_node, NULL);
4974 field = next_initializable_field (TYPE_FIELDS (type));
4980 An initializer for an aggregate member that is an
4981 empty class shall have the form of an empty
4982 initializer-list {}. */
4983 if (!first_initializer_p)
4985 error ("initializer for %qT must be brace-enclosed", type);
4986 return error_mark_node;
4991 /* Loop through the initializable fields, gathering initializers. */
4992 while (d->cur != d->end)
4996 /* Handle designated initializers, as an extension. */
4999 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5001 if (!field || TREE_CODE (field) != FIELD_DECL)
5003 error ("%qT has no non-static data member named %qD", type,
5005 return error_mark_node;
5009 /* If we processed all the member of the class, we are done. */
5013 field_init = reshape_init_r (TREE_TYPE (field), d,
5014 /*first_initializer_p=*/false);
5015 if (field_init == error_mark_node)
5016 return error_mark_node;
5018 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5022 When a union is initialized with a brace-enclosed
5023 initializer, the braces shall only contain an
5024 initializer for the first member of the union. */
5025 if (TREE_CODE (type) == UNION_TYPE)
5028 field = next_initializable_field (DECL_CHAIN (field));
5034 /* Subroutine of reshape_init, which processes a single initializer (part of
5035 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5036 iterator within the CONSTRUCTOR which points to the initializer to process.
5037 FIRST_INITIALIZER_P is true if this is the first initializer of the
5038 outermost CONSTRUCTOR node. */
5041 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5043 tree init = d->cur->value;
5045 if (error_operand_p (init))
5046 return error_mark_node;
5048 /* A non-aggregate type is always initialized with a single
5050 if (!CP_AGGREGATE_TYPE_P (type))
5052 /* It is invalid to initialize a non-aggregate type with a
5053 brace-enclosed initializer before C++0x.
5054 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5055 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5056 a CONSTRUCTOR (with a record type). */
5057 if (TREE_CODE (init) == CONSTRUCTOR
5058 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5060 if (SCALAR_TYPE_P (type))
5062 error ("braces around scalar initializer for type %qT", type);
5063 init = error_mark_node;
5066 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5075 All implicit type conversions (clause _conv_) are considered when
5076 initializing the aggregate member with an initializer from an
5077 initializer-list. If the initializer can initialize a member,
5078 the member is initialized. Otherwise, if the member is itself a
5079 non-empty subaggregate, brace elision is assumed and the
5080 initializer is considered for the initialization of the first
5081 member of the subaggregate. */
5082 if (TREE_CODE (init) != CONSTRUCTOR
5083 /* But don't try this for the first initializer, since that would be
5084 looking through the outermost braces; A a2 = { a1 }; is not a
5085 valid aggregate initialization. */
5086 && !first_initializer_p
5087 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5088 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5094 /* [dcl.init.string]
5096 A char array (whether plain char, signed char, or unsigned char)
5097 can be initialized by a string-literal (optionally enclosed in
5098 braces); a wchar_t array can be initialized by a wide
5099 string-literal (optionally enclosed in braces). */
5100 if (TREE_CODE (type) == ARRAY_TYPE
5101 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5103 tree str_init = init;
5105 /* Strip one level of braces if and only if they enclose a single
5106 element (as allowed by [dcl.init.string]). */
5107 if (!first_initializer_p
5108 && TREE_CODE (str_init) == CONSTRUCTOR
5109 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5111 str_init = VEC_index (constructor_elt,
5112 CONSTRUCTOR_ELTS (str_init), 0)->value;
5115 /* If it's a string literal, then it's the initializer for the array
5116 as a whole. Otherwise, continue with normal initialization for
5117 array types (one value per array element). */
5118 if (TREE_CODE (str_init) == STRING_CST)
5125 /* The following cases are about aggregates. If we are not within a full
5126 initializer already, and there is not a CONSTRUCTOR, it means that there
5127 is a missing set of braces (that is, we are processing the case for
5128 which reshape_init exists). */
5129 if (!first_initializer_p)
5131 if (TREE_CODE (init) == CONSTRUCTOR)
5133 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5134 /* There is no need to reshape pointer-to-member function
5135 initializers, as they are always constructed correctly
5136 by the front end. */
5138 else if (COMPOUND_LITERAL_P (init))
5139 /* For a nested compound literal, there is no need to reshape since
5140 brace elision is not allowed. Even if we decided to allow it,
5141 we should add a call to reshape_init in finish_compound_literal,
5142 before calling digest_init, so changing this code would still
5143 not be necessary. */
5144 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5148 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5149 return reshape_init (type, init);
5153 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5157 /* Dispatch to specialized routines. */
5158 if (CLASS_TYPE_P (type))
5159 return reshape_init_class (type, d, first_initializer_p);
5160 else if (TREE_CODE (type) == ARRAY_TYPE)
5161 return reshape_init_array (type, d);
5162 else if (TREE_CODE (type) == VECTOR_TYPE)
5163 return reshape_init_vector (type, d);
5168 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5169 brace-enclosed aggregate initializer.
5171 INIT is the CONSTRUCTOR containing the list of initializers describing
5172 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5173 It may not presently match the shape of the TYPE; for example:
5175 struct S { int a; int b; };
5176 struct S a[] = { 1, 2, 3, 4 };
5178 Here INIT will hold a VEC of four elements, rather than a
5179 VEC of two elements, each itself a VEC of two elements. This
5180 routine transforms INIT from the former form into the latter. The
5181 revised CONSTRUCTOR node is returned. */
5184 reshape_init (tree type, tree init)
5186 VEC(constructor_elt, gc) *v;
5190 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5192 v = CONSTRUCTOR_ELTS (init);
5194 /* An empty constructor does not need reshaping, and it is always a valid
5196 if (VEC_empty (constructor_elt, v))
5199 /* Recurse on this CONSTRUCTOR. */
5200 d.cur = VEC_index (constructor_elt, v, 0);
5201 d.end = d.cur + VEC_length (constructor_elt, v);
5203 new_init = reshape_init_r (type, &d, true);
5204 if (new_init == error_mark_node)
5205 return error_mark_node;
5207 /* Make sure all the element of the constructor were used. Otherwise,
5208 issue an error about exceeding initializers. */
5210 error ("too many initializers for %qT", type);
5215 /* Verify array initializer. Returns true if errors have been reported. */
5218 check_array_initializer (tree decl, tree type, tree init)
5220 tree element_type = TREE_TYPE (type);
5222 /* The array type itself need not be complete, because the
5223 initializer may tell us how many elements are in the array.
5224 But, the elements of the array must be complete. */
5225 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5228 error ("elements of array %q#D have incomplete type", decl);
5230 error ("elements of array %q#T have incomplete type", type);
5233 /* It is not valid to initialize a VLA. */
5235 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5236 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5239 error ("variable-sized object %qD may not be initialized", decl);
5241 error ("variable-sized compound literal");
5247 /* Subroutine of check_initializer; args are passed down from that function.
5248 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5251 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5254 int saved_stmts_are_full_exprs_p = 0;
5255 if (building_stmt_tree ())
5257 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5258 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5260 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5261 if (building_stmt_tree ())
5262 current_stmt_tree ()->stmts_are_full_exprs_p =
5263 saved_stmts_are_full_exprs_p;
5267 /* Verify INIT (the initializer for DECL), and record the
5268 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5269 grok_reference_init.
5271 If the return value is non-NULL, it is an expression that must be
5272 evaluated dynamically to initialize DECL. */
5275 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5277 tree type = TREE_TYPE (decl);
5278 tree init_code = NULL;
5279 tree extra_init = NULL_TREE;
5282 /* Things that are going to be initialized need to have complete
5284 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5286 if (type == error_mark_node)
5287 /* We will have already complained. */
5290 if (TREE_CODE (type) == ARRAY_TYPE)
5292 if (check_array_initializer (decl, type, init))
5295 else if (!COMPLETE_TYPE_P (type))
5297 error ("%qD has incomplete type", decl);
5298 TREE_TYPE (decl) = error_mark_node;
5302 /* There is no way to make a variable-sized class type in GNU C++. */
5303 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5305 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5307 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5308 if (SCALAR_TYPE_P (type))
5312 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5313 init = build_zero_init (type, NULL_TREE, false);
5315 else if (init_len != 1)
5317 error ("scalar object %qD requires one element in initializer",
5319 TREE_TYPE (decl) = error_mark_node;
5325 if (TREE_CODE (decl) == CONST_DECL)
5327 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5329 DECL_INITIAL (decl) = init;
5331 gcc_assert (init != NULL_TREE);
5334 else if (!init && DECL_REALLY_EXTERN (decl))
5336 else if (TREE_CODE (type) == REFERENCE_TYPE)
5337 init = grok_reference_init (decl, type, init, cleanup);
5338 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5341 check_for_uninitialized_const_var (decl);
5342 /* Do not reshape constructors of vectors (they don't need to be
5344 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5346 if (is_std_init_list (type))
5347 init = build_init_list_var_init (decl, type, init,
5348 &extra_init, cleanup);
5349 else if (TYPE_NON_AGGREGATE_CLASS (type))
5351 /* Don't reshape if the class has constructors. */
5352 if (cxx_dialect == cxx98)
5353 error ("in C++98 %qD must be initialized by constructor, "
5357 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5359 error ("opaque vector types cannot be initialized");
5360 init = error_mark_node;
5363 init = reshape_init (type, init);
5366 /* If DECL has an array type without a specific bound, deduce the
5367 array size from the initializer. */
5368 maybe_deduce_size_from_array_init (decl, init);
5369 type = TREE_TYPE (decl);
5370 if (type == error_mark_node)
5373 if (TYPE_NEEDS_CONSTRUCTING (type)
5374 || (CLASS_TYPE_P (type)
5375 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5377 init_code = build_aggr_init_full_exprs (decl, init, flags);
5379 /* If this is a constexpr initializer, expand_default_init will
5380 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5381 case, pull the initializer back out and pass it down into
5382 store_init_value. */
5383 while (TREE_CODE (init_code) == EXPR_STMT
5384 || TREE_CODE (init_code) == CONVERT_EXPR)
5385 init_code = TREE_OPERAND (init_code, 0);
5386 if (TREE_CODE (init_code) == INIT_EXPR)
5388 init = TREE_OPERAND (init_code, 1);
5389 init_code = NULL_TREE;
5390 /* Don't call digest_init; it's unnecessary and will complain
5391 about aggregate initialization of non-aggregate classes. */
5392 flags |= LOOKUP_ALREADY_DIGESTED;
5394 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5396 /* Declared constexpr, but no suitable initializer; massage
5397 init appropriately so we can pass it into store_init_value
5399 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5400 init = finish_compound_literal (type, init);
5401 else if (CLASS_TYPE_P (type)
5402 && (!init || TREE_CODE (init) == TREE_LIST))
5404 init = build_functional_cast (type, init, tf_none);
5405 if (init != error_mark_node)
5406 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5408 init_code = NULL_TREE;
5414 if (init && TREE_CODE (init) != TREE_VEC)
5416 init_code = store_init_value (decl, init, flags);
5417 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5418 && DECL_INITIAL (decl)
5419 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5420 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5421 warning (0, "array %qD initialized by parenthesized string literal %qE",
5422 decl, DECL_INITIAL (decl));
5428 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5429 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5430 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5431 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5434 check_for_uninitialized_const_var (decl);
5437 if (init && init != error_mark_node)
5438 init_code = build2 (INIT_EXPR, type, decl, init);
5441 init_code = add_stmt_to_compound (extra_init, init_code);
5443 if (init_code && DECL_IN_AGGR_P (decl))
5445 static int explained = 0;
5447 if (cxx_dialect < cxx0x)
5448 error ("initializer invalid for static member with constructor");
5450 error ("non-constant in-class initialization invalid for static "
5451 "member %qD", decl);
5454 error ("(an out of class initialization is required)");
5462 /* If DECL is not a local variable, give it RTL. */
5465 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5467 int toplev = toplevel_bindings_p ();
5469 const char *filename;
5471 /* Set the DECL_ASSEMBLER_NAME for the object. */
5474 /* The `register' keyword, when used together with an
5475 asm-specification, indicates that the variable should be
5476 placed in a particular register. */
5477 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5479 set_user_assembler_name (decl, asmspec);
5480 DECL_HARD_REGISTER (decl) = 1;
5484 if (TREE_CODE (decl) == FUNCTION_DECL
5485 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5486 set_builtin_user_assembler_name (decl, asmspec);
5487 set_user_assembler_name (decl, asmspec);
5491 /* Handle non-variables up front. */
5492 if (TREE_CODE (decl) != VAR_DECL)
5494 rest_of_decl_compilation (decl, toplev, at_eof);
5498 /* If we see a class member here, it should be a static data
5500 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5502 gcc_assert (TREE_STATIC (decl));
5503 /* An in-class declaration of a static data member should be
5504 external; it is only a declaration, and not a definition. */
5505 if (init == NULL_TREE)
5506 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5509 /* We don't create any RTL for local variables. */
5510 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5513 /* We defer emission of local statics until the corresponding
5514 DECL_EXPR is expanded. */
5515 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5517 /* We try to defer namespace-scope static constants so that they are
5518 not emitted into the object file unnecessarily. */
5519 filename = input_filename;
5520 if (!DECL_VIRTUAL_P (decl)
5521 && TREE_READONLY (decl)
5522 && DECL_INITIAL (decl) != NULL_TREE
5523 && DECL_INITIAL (decl) != error_mark_node
5525 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5527 && !TREE_PUBLIC (decl))
5529 /* Fool with the linkage of static consts according to #pragma
5531 struct c_fileinfo *finfo = get_fileinfo (filename);
5532 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5534 TREE_PUBLIC (decl) = 1;
5535 DECL_EXTERNAL (decl) = finfo->interface_only;
5540 /* Likewise for template instantiations. */
5541 else if (DECL_LANG_SPECIFIC (decl)
5542 && DECL_IMPLICIT_INSTANTIATION (decl))
5545 /* If we're not deferring, go ahead and assemble the variable. */
5547 rest_of_decl_compilation (decl, toplev, at_eof);
5550 /* walk_tree helper for wrap_temporary_cleanups, below. */
5553 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5555 if (TYPE_P (*stmt_p))
5561 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5563 tree guard = (tree)data;
5564 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5566 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5567 /* Tell honor_protect_cleanup_actions to handle this as a separate
5569 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5571 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5577 /* We're initializing a local variable which has a cleanup GUARD. If there
5578 are any temporaries used in the initializer INIT of this variable, we
5579 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5580 variable will be cleaned up properly if one of them throws.
5582 Unfortunately, there's no way to express this properly in terms of
5583 nesting, as the regions for the temporaries overlap the region for the
5584 variable itself; if there are two temporaries, the variable needs to be
5585 the first thing destroyed if either of them throws. However, we only
5586 want to run the variable's cleanup if it actually got constructed. So
5587 we need to guard the temporary cleanups with the variable's cleanup if
5588 they are run on the normal path, but not if they are run on the
5589 exceptional path. We implement this by telling
5590 honor_protect_cleanup_actions to strip the variable cleanup from the
5591 exceptional path. */
5594 wrap_temporary_cleanups (tree init, tree guard)
5596 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5599 /* Generate code to initialize DECL (a local variable). */
5602 initialize_local_var (tree decl, tree init)
5604 tree type = TREE_TYPE (decl);
5608 gcc_assert (TREE_CODE (decl) == VAR_DECL
5609 || TREE_CODE (decl) == RESULT_DECL);
5610 gcc_assert (!TREE_STATIC (decl));
5612 if (DECL_SIZE (decl) == NULL_TREE)
5614 /* If we used it already as memory, it must stay in memory. */
5615 DECL_INITIAL (decl) = NULL_TREE;
5616 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5620 if (type == error_mark_node)
5623 /* Compute and store the initial value. */
5624 already_used = TREE_USED (decl) || TREE_USED (type);
5625 if (TREE_USED (type))
5626 DECL_READ_P (decl) = 1;
5628 /* Generate a cleanup, if necessary. */
5629 cleanup = cxx_maybe_build_cleanup (decl);
5631 /* Perform the initialization. */
5634 int saved_stmts_are_full_exprs_p;
5636 /* If we're only initializing a single object, guard the destructors
5637 of any temporaries used in its initializer with its destructor.
5638 This isn't right for arrays because each element initialization is
5639 a full-expression. */
5640 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5641 wrap_temporary_cleanups (init, cleanup);
5643 gcc_assert (building_stmt_tree ());
5644 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5645 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5646 finish_expr_stmt (init);
5647 current_stmt_tree ()->stmts_are_full_exprs_p =
5648 saved_stmts_are_full_exprs_p;
5651 /* Set this to 0 so we can tell whether an aggregate which was
5652 initialized was ever used. Don't do this if it has a
5653 destructor, so we don't complain about the 'resource
5654 allocation is initialization' idiom. Now set
5655 attribute((unused)) on types so decls of that type will be
5656 marked used. (see TREE_USED, above.) */
5657 if (TYPE_NEEDS_CONSTRUCTING (type)
5659 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5660 && DECL_NAME (decl))
5661 TREE_USED (decl) = 0;
5662 else if (already_used)
5663 TREE_USED (decl) = 1;
5666 finish_decl_cleanup (decl, cleanup);
5669 /* DECL is a VAR_DECL for a compiler-generated variable with static
5670 storage duration (like a virtual table) whose initializer is a
5671 compile-time constant. Initialize the variable and provide it to the
5675 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5678 gcc_assert (DECL_ARTIFICIAL (decl));
5679 init = build_constructor (TREE_TYPE (decl), v);
5680 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5681 DECL_INITIAL (decl) = init;
5682 DECL_INITIALIZED_P (decl) = 1;
5683 determine_visibility (decl);
5684 layout_var_decl (decl);
5685 maybe_commonize_var (decl);
5686 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5689 /* INIT is the initializer for a variable, as represented by the
5690 parser. Returns true iff INIT is value-dependent. */
5693 value_dependent_init_p (tree init)
5695 if (TREE_CODE (init) == TREE_LIST)
5696 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5697 return any_value_dependent_elements_p (init);
5698 else if (TREE_CODE (init) == CONSTRUCTOR)
5699 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5701 VEC(constructor_elt, gc) *elts;
5705 elts = CONSTRUCTOR_ELTS (init);
5706 nelts = VEC_length (constructor_elt, elts);
5707 for (i = 0; i < nelts; ++i)
5708 if (value_dependent_init_p (VEC_index (constructor_elt,
5713 /* It must be a simple expression, e.g., int i = 3; */
5714 return value_dependent_expression_p (init);
5719 /* Finish processing of a declaration;
5720 install its line number and initial value.
5721 If the length of an array type is not known before,
5722 it must be determined now, from the initial value, or it is an error.
5724 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5725 true, then INIT is an integral constant expression.
5727 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5728 if the (init) syntax was used. */
5731 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5732 tree asmspec_tree, int flags)
5736 const char *asmspec = NULL;
5737 int was_readonly = 0;
5738 bool var_definition_p = false;
5739 int saved_processing_template_decl;
5742 if (decl == error_mark_node)
5747 error ("assignment (not initialization) in declaration");
5751 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5752 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5753 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5755 type = TREE_TYPE (decl);
5756 if (type == error_mark_node)
5759 /* Assume no cleanup is required. */
5760 cleanup = NULL_TREE;
5761 saved_processing_template_decl = processing_template_decl;
5763 /* If a name was specified, get the string. */
5764 if (global_scope_p (current_binding_level))
5765 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5766 if (asmspec_tree && asmspec_tree != error_mark_node)
5767 asmspec = TREE_STRING_POINTER (asmspec_tree);
5769 if (current_class_type
5770 && CP_DECL_CONTEXT (decl) == current_class_type
5771 && TYPE_BEING_DEFINED (current_class_type)
5772 && (DECL_INITIAL (decl) || init))
5773 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5775 auto_node = type_uses_auto (type);
5779 if (init == NULL_TREE)
5781 error ("declaration of %q#D has no initializer", decl);
5782 TREE_TYPE (decl) = error_mark_node;
5786 if (TREE_CODE (d_init) == TREE_LIST)
5787 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5788 tf_warning_or_error);
5789 d_init = resolve_nondeduced_context (d_init);
5790 if (describable_type (d_init))
5792 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5794 if (type == error_mark_node)
5799 if (TREE_CODE (decl) == FUNCTION_DECL
5800 /* For members, defer until finalize_literal_type_property. */
5801 && (!DECL_CLASS_SCOPE_P (decl)
5802 || !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))))
5803 validate_constexpr_fundecl (decl);
5805 else if (!ensure_literal_type_for_constexpr_object (decl))
5806 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5808 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5811 if (init == ridpointers[(int)RID_DELETE])
5813 /* FIXME check this is 1st decl. */
5814 DECL_DELETED_FN (decl) = 1;
5815 DECL_DECLARED_INLINE_P (decl) = 1;
5816 DECL_INITIAL (decl) = error_mark_node;
5817 FOR_EACH_CLONE (clone, decl)
5819 DECL_DELETED_FN (clone) = 1;
5820 DECL_DECLARED_INLINE_P (clone) = 1;
5821 DECL_INITIAL (clone) = error_mark_node;
5825 else if (init == ridpointers[(int)RID_DEFAULT])
5827 if (defaultable_fn_check (decl))
5828 DECL_DEFAULTED_FN (decl) = 1;
5830 DECL_INITIAL (decl) = NULL_TREE;
5834 if (init && TREE_CODE (decl) == VAR_DECL)
5836 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5837 if (init_const_expr_p)
5839 /* Set these flags now for templates. We'll update the flags in
5840 store_init_value for instantiations. */
5841 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5842 if (decl_maybe_constant_var_p (decl))
5843 TREE_CONSTANT (decl) = 1;
5847 if (processing_template_decl)
5849 bool type_dependent_p;
5851 /* Add this declaration to the statement-tree. */
5852 if (at_function_scope_p ())
5853 add_decl_expr (decl);
5855 type_dependent_p = dependent_type_p (type);
5857 if (check_for_bare_parameter_packs (init))
5860 DECL_INITIAL (decl) = NULL_TREE;
5863 /* Generally, initializers in templates are expanded when the
5864 template is instantiated. But, if DECL is a variable constant
5865 then it can be used in future constant expressions, so its value
5866 must be available. */
5868 && DECL_CLASS_SCOPE_P (decl)
5869 /* We just set TREE_CONSTANT appropriately; see above. */
5870 && TREE_CONSTANT (decl)
5871 && !type_dependent_p
5872 /* FIXME non-value-dependent constant expression */
5873 && !value_dependent_init_p (init)))
5876 DECL_INITIAL (decl) = init;
5877 if (TREE_CODE (decl) == VAR_DECL
5878 && !DECL_PRETTY_FUNCTION_P (decl)
5879 && !type_dependent_p)
5880 maybe_deduce_size_from_array_init (decl, init);
5884 if (TREE_CODE (init) == TREE_LIST)
5886 /* If the parenthesized-initializer form was used (e.g.,
5887 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5888 arguments. (There is generally only one.) We convert them
5891 for (; list; list = TREE_CHAIN (list))
5893 tree elt = TREE_VALUE (list);
5894 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5898 init = fold_non_dependent_expr (init);
5899 processing_template_decl = 0;
5902 /* Take care of TYPE_DECLs up front. */
5903 if (TREE_CODE (decl) == TYPE_DECL)
5905 if (type != error_mark_node
5906 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5908 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5909 warning (0, "shadowing previous type declaration of %q#D", decl);
5910 set_identifier_type_value (DECL_NAME (decl), decl);
5913 /* If we have installed this as the canonical typedef for this
5914 type, and that type has not been defined yet, delay emitting
5915 the debug information for it, as we will emit it later. */
5916 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5917 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5918 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5920 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5925 /* A reference will be modified here, as it is initialized. */
5926 if (! DECL_EXTERNAL (decl)
5927 && TREE_READONLY (decl)
5928 && TREE_CODE (type) == REFERENCE_TYPE)
5931 TREE_READONLY (decl) = 0;
5934 if (TREE_CODE (decl) == VAR_DECL)
5936 /* Only variables with trivial initialization and destruction can
5937 have thread-local storage. */
5938 if (DECL_THREAD_LOCAL_P (decl)
5939 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5940 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5941 error ("%qD cannot be thread-local because it has non-trivial "
5942 "type %qT", decl, TREE_TYPE (decl));
5943 /* If this is a local variable that will need a mangled name,
5944 register it now. We must do this before processing the
5945 initializer for the variable, since the initialization might
5946 require a guard variable, and since the mangled name of the
5947 guard variable will depend on the mangled name of this
5949 if (DECL_FUNCTION_SCOPE_P (decl)
5950 && TREE_STATIC (decl)
5951 && !DECL_ARTIFICIAL (decl))
5953 push_local_name (decl);
5954 if (DECL_CONSTRUCTOR_P (current_function_decl)
5955 || DECL_DESTRUCTOR_P (current_function_decl))
5956 /* Normally local_decls is populated during GIMPLE lowering,
5957 but [cd]tors are never actually compiled directly. We need
5958 to put statics on the list so we can deal with the label
5959 address extension. */
5960 add_local_decl (cfun, decl);
5963 /* Convert the initializer to the type of DECL, if we have not
5964 already initialized DECL. */
5965 if (!DECL_INITIALIZED_P (decl)
5966 /* If !DECL_EXTERNAL then DECL is being defined. In the
5967 case of a static data member initialized inside the
5968 class-specifier, there can be an initializer even if DECL
5969 is *not* defined. */
5970 && (!DECL_EXTERNAL (decl) || init))
5972 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5975 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5976 /* Allow libjava/prims.cc define primitive classes. */
5977 if (init != NULL_TREE
5978 || jclass == NULL_TREE
5979 || TREE_CODE (jclass) != TYPE_DECL
5980 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5981 || !same_type_ignoring_top_level_qualifiers_p
5982 (type, TREE_TYPE (TREE_TYPE (jclass))))
5983 error ("Java object %qD not allocated with %<new%>", decl);
5986 init = check_initializer (decl, init, flags, &cleanup);
5987 /* Thread-local storage cannot be dynamically initialized. */
5988 if (DECL_THREAD_LOCAL_P (decl) && init)
5990 error ("%qD is thread-local and so cannot be dynamically "
5991 "initialized", decl);
5995 /* Check that the initializer for a static data member was a
5996 constant. Although we check in the parser that the
5997 initializer is an integral constant expression, we do not
5998 simplify division-by-zero at the point at which it
5999 occurs. Therefore, in:
6001 struct S { static const int i = 7 / 0; };
6003 we issue an error at this point. It would
6004 probably be better to forbid division by zero in
6005 integral constant expressions. */
6006 if (DECL_EXTERNAL (decl) && init)
6008 error ("%qD cannot be initialized by a non-constant expression"
6009 " when being declared", decl);
6010 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6018 The memory occupied by any object of static storage
6019 duration is zero-initialized at program startup before
6020 any other initialization takes place.
6022 We cannot create an appropriate initializer until after
6023 the type of DECL is finalized. If DECL_INITIAL is set,
6024 then the DECL is statically initialized, and any
6025 necessary zero-initialization has already been performed. */
6026 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6027 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6028 /*nelts=*/NULL_TREE,
6029 /*static_storage_p=*/true);
6030 /* Remember that the initialization for this variable has
6032 DECL_INITIALIZED_P (decl) = 1;
6033 /* This declaration is the definition of this variable,
6034 unless we are initializing a static data member within
6035 the class specifier. */
6036 if (!DECL_EXTERNAL (decl))
6037 var_definition_p = true;
6039 /* If the variable has an array type, lay out the type, even if
6040 there is no initializer. It is valid to index through the
6041 array, and we must get TYPE_ALIGN set correctly on the array
6043 else if (TREE_CODE (type) == ARRAY_TYPE)
6046 if (!processing_template_decl
6047 && TREE_STATIC (decl)
6048 && !at_function_scope_p ()
6049 && current_function_decl == NULL)
6050 /* So decl is a global variable or a static member of a
6051 non local class. Record the types it uses
6052 so that we can decide later to emit debug info for them. */
6053 record_types_used_by_current_var_decl (decl);
6055 else if (TREE_CODE (decl) == FIELD_DECL
6056 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6057 error ("non-static data member %qD has Java class type", decl);
6059 /* Add this declaration to the statement-tree. This needs to happen
6060 after the call to check_initializer so that the DECL_EXPR for a
6061 reference temp is added before the DECL_EXPR for the reference itself. */
6062 if (at_function_scope_p ())
6063 add_decl_expr (decl);
6065 /* Let the middle end know about variables and functions -- but not
6066 static data members in uninstantiated class templates. */
6067 if (!saved_processing_template_decl
6068 && (TREE_CODE (decl) == VAR_DECL
6069 || TREE_CODE (decl) == FUNCTION_DECL))
6071 if (TREE_CODE (decl) == VAR_DECL)
6073 layout_var_decl (decl);
6074 maybe_commonize_var (decl);
6077 /* This needs to happen after the linkage is set. */
6078 determine_visibility (decl);
6080 if (var_definition_p && TREE_STATIC (decl))
6082 /* If a TREE_READONLY variable needs initialization
6083 at runtime, it is no longer readonly and we need to
6084 avoid MEM_READONLY_P being set on RTL created for it. */
6087 if (TREE_READONLY (decl))
6088 TREE_READONLY (decl) = 0;
6091 else if (was_readonly)
6092 TREE_READONLY (decl) = 1;
6095 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6097 /* Check for abstractness of the type. Notice that there is no
6098 need to strip array types here since the check for those types
6099 is already done within create_array_type_for_decl. */
6100 if (TREE_CODE (type) == FUNCTION_TYPE
6101 || TREE_CODE (type) == METHOD_TYPE)
6102 abstract_virtuals_error (decl, TREE_TYPE (type));
6104 abstract_virtuals_error (decl, type);
6106 if (TREE_TYPE (decl) == error_mark_node)
6107 /* No initialization required. */
6109 else if (TREE_CODE (decl) == FUNCTION_DECL)
6113 if (init == ridpointers[(int)RID_DEFAULT])
6115 /* An out-of-class default definition is defined at
6116 the point where it is explicitly defaulted. */
6117 if (DECL_DELETED_FN (decl))
6118 maybe_explain_implicit_delete (decl);
6119 else if (DECL_INITIAL (decl) == error_mark_node)
6120 synthesize_method (decl);
6123 error ("function %q#D is initialized like a variable", decl);
6125 /* else no initialization required. */
6127 else if (DECL_EXTERNAL (decl)
6128 && ! (DECL_LANG_SPECIFIC (decl)
6129 && DECL_NOT_REALLY_EXTERN (decl)))
6132 DECL_INITIAL (decl) = init;
6134 /* A variable definition. */
6135 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6136 /* Initialize the local variable. */
6137 initialize_local_var (decl, init);
6139 /* If a variable is defined, and then a subsequent
6140 definition with external linkage is encountered, we will
6141 get here twice for the same variable. We want to avoid
6142 calling expand_static_init more than once. For variables
6143 that are not static data members, we can call
6144 expand_static_init only when we actually process the
6145 initializer. It is not legal to redeclare a static data
6146 member, so this issue does not arise in that case. */
6147 else if (var_definition_p && TREE_STATIC (decl))
6148 expand_static_init (decl, init);
6151 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6152 reference, insert it in the statement-tree now. */
6154 push_cleanup (decl, cleanup, false);
6157 processing_template_decl = saved_processing_template_decl;
6160 TREE_READONLY (decl) = 1;
6163 /* Returns a declaration for a VAR_DECL as if:
6165 extern "C" TYPE NAME;
6167 had been seen. Used to create compiler-generated global
6171 declare_global_var (tree name, tree type)
6175 push_to_top_level ();
6176 decl = build_decl (input_location, VAR_DECL, name, type);
6177 TREE_PUBLIC (decl) = 1;
6178 DECL_EXTERNAL (decl) = 1;
6179 DECL_ARTIFICIAL (decl) = 1;
6180 /* If the user has explicitly declared this variable (perhaps
6181 because the code we are compiling is part of a low-level runtime
6182 library), then it is possible that our declaration will be merged
6183 with theirs by pushdecl. */
6184 decl = pushdecl (decl);
6185 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6186 pop_from_top_level ();
6191 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6192 if "__cxa_atexit" is not being used) corresponding to the function
6193 to be called when the program exits. */
6196 get_atexit_fn_ptr_type (void)
6200 if (!atexit_fn_ptr_type_node)
6203 if (flag_use_cxa_atexit
6204 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6205 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6206 arg_type = ptr_type_node;
6208 /* The parameter to "atexit" is "void (*)(void)". */
6209 arg_type = NULL_TREE;
6211 fn_type = build_function_type_list (void_type_node,
6212 arg_type, NULL_TREE);
6213 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6216 return atexit_fn_ptr_type_node;
6219 /* Returns a pointer to the `atexit' function. Note that if
6220 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6221 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6224 get_atexit_node (void)
6230 bool use_aeabi_atexit;
6235 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6237 /* The declaration for `__cxa_atexit' is:
6239 int __cxa_atexit (void (*)(void *), void *, void *)
6241 We build up the argument types and then the function type
6243 tree argtype0, argtype1, argtype2;
6245 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6246 /* First, build the pointer-to-function type for the first
6248 fn_ptr_type = get_atexit_fn_ptr_type ();
6249 /* Then, build the rest of the argument types. */
6250 argtype2 = ptr_type_node;
6251 if (use_aeabi_atexit)
6253 argtype1 = fn_ptr_type;
6254 argtype0 = ptr_type_node;
6258 argtype1 = ptr_type_node;
6259 argtype0 = fn_ptr_type;
6261 /* And the final __cxa_atexit type. */
6262 fn_type = build_function_type_list (integer_type_node,
6263 argtype0, argtype1, argtype2,
6265 fn_ptr_type = build_pointer_type (fn_type);
6266 if (use_aeabi_atexit)
6267 name = "__aeabi_atexit";
6269 name = "__cxa_atexit";
6273 /* The declaration for `atexit' is:
6275 int atexit (void (*)());
6277 We build up the argument types and then the function type
6279 fn_ptr_type = get_atexit_fn_ptr_type ();
6280 /* Build the final atexit type. */
6281 fn_type = build_function_type_list (integer_type_node,
6282 fn_ptr_type, NULL_TREE);
6286 /* Now, build the function declaration. */
6287 push_lang_context (lang_name_c);
6288 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6289 mark_used (atexit_fndecl);
6290 pop_lang_context ();
6291 atexit_node = decay_conversion (atexit_fndecl);
6296 /* Returns the __dso_handle VAR_DECL. */
6299 get_dso_handle_node (void)
6301 if (dso_handle_node)
6302 return dso_handle_node;
6304 /* Declare the variable. */
6305 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6308 return dso_handle_node;
6311 /* Begin a new function with internal linkage whose job will be simply
6312 to destroy some particular variable. */
6314 static GTY(()) int start_cleanup_cnt;
6317 start_cleanup_fn (void)
6322 bool use_cxa_atexit = flag_use_cxa_atexit
6323 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6325 push_to_top_level ();
6327 /* No need to mangle this. */
6328 push_lang_context (lang_name_c);
6330 /* Build the name of the function. */
6331 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6332 /* Build the function declaration. */
6333 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6334 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6335 /* It's a function with internal linkage, generated by the
6337 TREE_PUBLIC (fndecl) = 0;
6338 DECL_ARTIFICIAL (fndecl) = 1;
6339 /* Make the function `inline' so that it is only emitted if it is
6340 actually needed. It is unlikely that it will be inlined, since
6341 it is only called via a function pointer, but we avoid unnecessary
6342 emissions this way. */
6343 DECL_DECLARED_INLINE_P (fndecl) = 1;
6344 DECL_INTERFACE_KNOWN (fndecl) = 1;
6345 /* Build the parameter. */
6350 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6351 DECL_CONTEXT (parmdecl) = fndecl;
6352 TREE_USED (parmdecl) = 1;
6353 DECL_READ_P (parmdecl) = 1;
6354 DECL_ARGUMENTS (fndecl) = parmdecl;
6358 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6360 pop_lang_context ();
6362 return current_function_decl;
6365 /* Finish the cleanup function begun by start_cleanup_fn. */
6368 end_cleanup_fn (void)
6370 expand_or_defer_fn (finish_function (0));
6372 pop_from_top_level ();
6375 /* Generate code to handle the destruction of DECL, an object with
6376 static storage duration. */
6379 register_dtor_fn (tree decl)
6386 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6388 type = TREE_TYPE (decl);
6389 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6390 return void_zero_node;
6392 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6393 a class object, we can just pass the destructor to
6394 "__cxa_atexit"; we don't have to build a temporary function to do
6396 use_dtor = (flag_use_cxa_atexit
6397 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6398 && CLASS_TYPE_P (type));
6403 /* Find the destructor. */
6404 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6405 gcc_assert (idx >= 0);
6406 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6407 /* Make sure it is accessible. */
6408 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6412 /* Call build_cleanup before we enter the anonymous function so
6413 that any access checks will be done relative to the current
6414 scope, rather than the scope of the anonymous function. */
6415 build_cleanup (decl);
6417 /* Now start the function. */
6418 cleanup = start_cleanup_fn ();
6420 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6421 to the original function, rather than the anonymous one. That
6422 will make the back end think that nested functions are in use,
6423 which causes confusion. */
6424 push_deferring_access_checks (dk_no_check);
6425 fcall = build_cleanup (decl);
6426 pop_deferring_access_checks ();
6428 /* Create the body of the anonymous function. */
6429 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6430 finish_expr_stmt (fcall);
6431 finish_compound_stmt (compound_stmt);
6435 /* Call atexit with the cleanup function. */
6436 mark_used (cleanup);
6437 cleanup = build_address (cleanup);
6438 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6444 /* We must convert CLEANUP to the type that "__cxa_atexit"
6446 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6447 /* "__cxa_atexit" will pass the address of DECL to the
6448 cleanup function. */
6450 addr = build_address (decl);
6451 /* The declared type of the parameter to "__cxa_atexit" is
6452 "void *". For plain "T*", we could just let the
6453 machinery in cp_build_function_call convert it -- but if the
6454 type is "cv-qualified T *", then we need to convert it
6455 before passing it in, to avoid spurious errors. */
6456 addr = build_nop (ptr_type_node, addr);
6459 /* Since the cleanup functions we build ignore the address
6460 they're given, there's no reason to pass the actual address
6461 in, and, in general, it's cheaper to pass NULL than any
6463 addr = null_pointer_node;
6464 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6465 tf_warning_or_error);
6466 if (targetm.cxx.use_aeabi_atexit ())
6479 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6480 arg0, arg1, arg2, NULL_TREE);
6483 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6484 is its initializer. Generate code to handle the construction
6485 and destruction of DECL. */
6488 expand_static_init (tree decl, tree init)
6490 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6491 gcc_assert (TREE_STATIC (decl));
6493 /* Some variables require no dynamic initialization. */
6495 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6498 if (DECL_FUNCTION_SCOPE_P (decl))
6500 /* Emit code to perform this initialization but once. */
6501 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6502 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6503 tree guard, guard_addr;
6504 tree acquire_fn, release_fn, abort_fn;
6507 /* Emit code to perform this initialization but once. This code
6510 static <type> guard;
6511 if (!guard.first_byte) {
6512 if (__cxa_guard_acquire (&guard)) {
6515 // Do initialization.
6516 flag = true; __cxa_guard_release (&guard);
6517 // Register variable for destruction at end of program.
6519 if (!flag) __cxa_guard_abort (&guard);
6523 Note that the `flag' variable is only set to 1 *after* the
6524 initialization is complete. This ensures that an exception,
6525 thrown during the construction, will cause the variable to
6526 reinitialized when we pass through this code again, as per:
6530 If the initialization exits by throwing an exception, the
6531 initialization is not complete, so it will be tried again
6532 the next time control enters the declaration.
6534 This process should be thread-safe, too; multiple threads
6535 should not be able to initialize the variable more than
6538 /* Create the guard variable. */
6539 guard = get_guard (decl);
6541 /* This optimization isn't safe on targets with relaxed memory
6542 consistency. On such targets we force synchronization in
6543 __cxa_guard_acquire. */
6544 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6546 /* Begin the conditional initialization. */
6547 if_stmt = begin_if_stmt ();
6548 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6549 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6552 if (flag_threadsafe_statics)
6554 guard_addr = build_address (guard);
6556 acquire_fn = get_identifier ("__cxa_guard_acquire");
6557 release_fn = get_identifier ("__cxa_guard_release");
6558 abort_fn = get_identifier ("__cxa_guard_abort");
6559 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6561 tree vfntype = build_function_type_list (void_type_node,
6562 TREE_TYPE (guard_addr),
6564 acquire_fn = push_library_fn
6565 (acquire_fn, build_function_type_list (integer_type_node,
6566 TREE_TYPE (guard_addr),
6569 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6570 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6574 release_fn = identifier_global_value (release_fn);
6575 abort_fn = identifier_global_value (abort_fn);
6578 inner_if_stmt = begin_if_stmt ();
6579 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6582 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6583 begin = get_target_expr (boolean_false_node);
6584 flag = TARGET_EXPR_SLOT (begin);
6586 TARGET_EXPR_CLEANUP (begin)
6587 = build3 (COND_EXPR, void_type_node, flag,
6589 build_call_n (abort_fn, 1, guard_addr));
6590 CLEANUP_EH_ONLY (begin) = 1;
6592 /* Do the initialization itself. */
6593 init = add_stmt_to_compound (begin, init);
6594 init = add_stmt_to_compound
6595 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6596 init = add_stmt_to_compound
6597 (init, build_call_n (release_fn, 1, guard_addr));
6600 init = add_stmt_to_compound (init, set_guard (guard));
6602 /* Use atexit to register a function for destroying this static
6604 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6606 finish_expr_stmt (init);
6608 if (flag_threadsafe_statics)
6610 finish_compound_stmt (inner_then_clause);
6611 finish_then_clause (inner_if_stmt);
6612 finish_if_stmt (inner_if_stmt);
6615 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6617 finish_compound_stmt (then_clause);
6618 finish_then_clause (if_stmt);
6619 finish_if_stmt (if_stmt);
6623 static_aggregates = tree_cons (init, decl, static_aggregates);
6627 /* Make TYPE a complete type based on INITIAL_VALUE.
6628 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6629 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6630 3 if the initializer list is empty (in pedantic mode). */
6633 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6636 tree type, elt_type;
6640 unsigned HOST_WIDE_INT i;
6643 /* An array of character type can be initialized from a
6644 brace-enclosed string constant.
6646 FIXME: this code is duplicated from reshape_init. Probably
6647 we should just call reshape_init here? */
6648 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6649 && TREE_CODE (initial_value) == CONSTRUCTOR
6650 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6652 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6653 tree value = VEC_index (constructor_elt, v, 0)->value;
6655 if (TREE_CODE (value) == STRING_CST
6656 && VEC_length (constructor_elt, v) == 1)
6657 initial_value = value;
6660 /* If any of the elements are parameter packs, we can't actually
6661 complete this type now because the array size is dependent. */
6662 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6664 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6667 if (PACK_EXPANSION_P (value))
6673 failure = complete_array_type (ptype, initial_value, do_default);
6675 /* We can create the array before the element type is complete, which
6676 means that we didn't have these two bits set in the original type
6677 either. In completing the type, we are expected to propagate these
6678 bits. See also complete_type which does the same thing for arrays
6681 if (TYPE_DOMAIN (type))
6683 elt_type = TREE_TYPE (type);
6684 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6685 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6686 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6692 /* Return zero if something is declared to be a member of type
6693 CTYPE when in the context of CUR_TYPE. STRING is the error
6694 message to print in that case. Otherwise, quietly return 1. */
6697 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6699 if (ctype && ctype != cur_type)
6701 if (flags == DTOR_FLAG)
6702 error ("destructor for alien class %qT cannot be a member", ctype);
6704 error ("constructor for alien class %qT cannot be a member", ctype);
6710 /* Subroutine of `grokdeclarator'. */
6712 /* Generate errors possibly applicable for a given set of specifiers.
6713 This is for ARM $7.1.2. */
6716 bad_specifiers (tree object,
6717 enum bad_spec_place type,
6728 error ("%qD declared as a %<virtual%> variable", object);
6730 error ("%qD declared as an %<inline%> variable", object);
6732 error ("%<const%> and %<volatile%> function specifiers on "
6733 "%qD invalid in variable declaration", object);
6737 error ("%qD declared as a %<virtual%> parameter", object);
6739 error ("%qD declared as an %<inline%> parameter", object);
6741 error ("%<const%> and %<volatile%> function specifiers on "
6742 "%qD invalid in parameter declaration", object);
6746 error ("%qD declared as a %<virtual%> type", object);
6748 error ("%qD declared as an %<inline%> type", object);
6750 error ("%<const%> and %<volatile%> function specifiers on "
6751 "%qD invalid in type declaration", object);
6755 error ("%qD declared as a %<virtual%> field", object);
6757 error ("%qD declared as an %<inline%> field", object);
6759 error ("%<const%> and %<volatile%> function specifiers on "
6760 "%qD invalid in field declaration", object);
6766 error ("%q+D declared as a friend", object);
6768 && (TREE_CODE (object) == TYPE_DECL
6769 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6770 && !TYPE_REFFN_P (TREE_TYPE (object))
6771 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6772 error ("%q+D declared with an exception specification", object);
6775 /* DECL is a member function or static data member and is presently
6776 being defined. Check that the definition is taking place in a
6780 check_class_member_definition_namespace (tree decl)
6782 /* These checks only apply to member functions and static data
6784 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6785 || TREE_CODE (decl) == VAR_DECL);
6786 /* We check for problems with specializations in pt.c in
6787 check_specialization_namespace, where we can issue better
6789 if (processing_specialization)
6791 /* There are no restrictions on the placement of
6792 explicit instantiations. */
6793 if (processing_explicit_instantiation)
6797 A member function definition that appears outside of the
6798 class definition shall appear in a namespace scope enclosing
6799 the class definition.
6803 The definition for a static data member shall appear in a
6804 namespace scope enclosing the member's class definition. */
6805 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6806 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6807 decl, DECL_CONTEXT (decl));
6810 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6811 METHOD_TYPE for a non-static member function; QUALS are the
6812 cv-qualifiers that apply to the function. */
6815 build_this_parm (tree type, cp_cv_quals quals)
6820 cp_cv_quals this_quals;
6822 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6823 /* The `this' parameter is implicitly `const'; it cannot be
6825 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6826 qual_type = cp_build_qualified_type (this_type, this_quals);
6827 parm = build_artificial_parm (this_identifier, qual_type);
6828 cp_apply_type_quals_to_decl (this_quals, parm);
6832 /* CTYPE is class type, or null if non-class.
6833 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6835 DECLARATOR is the function's name.
6836 PARMS is a chain of PARM_DECLs for the function.
6837 VIRTUALP is truthvalue of whether the function is virtual or not.
6838 FLAGS are to be passed through to `grokclassfn'.
6839 QUALS are qualifiers indicating whether the function is `const'
6841 RAISES is a list of exceptions that this function can raise.
6842 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6843 not look, and -1 if we should not call `grokclassfn' at all.
6845 SFK is the kind of special function (if any) for the new function.
6847 Returns `NULL_TREE' if something goes wrong, after issuing
6848 applicable error messages. */
6851 grokfndecl (tree ctype,
6855 tree orig_declarator,
6857 enum overload_flags flags,
6864 special_function_kind sfk,
6869 location_t location)
6872 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6876 type = build_exception_variant (type, raises);
6878 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6880 /* If we have an explicit location, use it, otherwise use whatever
6881 build_lang_decl used (probably input_location). */
6882 if (location != UNKNOWN_LOCATION)
6883 DECL_SOURCE_LOCATION (decl) = location;
6885 if (TREE_CODE (type) == METHOD_TYPE)
6888 parm = build_this_parm (type, quals);
6889 DECL_CHAIN (parm) = parms;
6892 DECL_ARGUMENTS (decl) = parms;
6893 for (t = parms; t; t = DECL_CHAIN (t))
6894 DECL_CONTEXT (t) = decl;
6895 /* Propagate volatile out from type to decl. */
6896 if (TYPE_VOLATILE (type))
6897 TREE_THIS_VOLATILE (decl) = 1;
6899 /* Setup decl according to sfk. */
6902 case sfk_constructor:
6903 case sfk_copy_constructor:
6904 case sfk_move_constructor:
6905 DECL_CONSTRUCTOR_P (decl) = 1;
6907 case sfk_destructor:
6908 DECL_DESTRUCTOR_P (decl) = 1;
6914 /* If pointers to member functions use the least significant bit to
6915 indicate whether a function is virtual, ensure a pointer
6916 to this function will have that bit clear. */
6917 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6918 && TREE_CODE (type) == METHOD_TYPE
6919 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6920 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6923 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6927 ("defining explicit specialization %qD in friend declaration",
6931 tree fns = TREE_OPERAND (orig_declarator, 0);
6932 tree args = TREE_OPERAND (orig_declarator, 1);
6934 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6936 /* Something like `template <class T> friend void f<T>()'. */
6937 error ("invalid use of template-id %qD in declaration "
6938 "of primary template",
6944 /* A friend declaration of the form friend void f<>(). Record
6945 the information in the TEMPLATE_ID_EXPR. */
6946 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6948 if (TREE_CODE (fns) == COMPONENT_REF)
6950 /* Due to bison parser ickiness, we will have already looked
6951 up an operator_name or PFUNCNAME within the current class
6952 (see template_id in parse.y). If the current class contains
6953 such a name, we'll get a COMPONENT_REF here. Undo that. */
6955 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6956 == current_class_type);
6957 fns = TREE_OPERAND (fns, 1);
6959 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6960 || TREE_CODE (fns) == OVERLOAD);
6961 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6963 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6964 if (TREE_PURPOSE (t)
6965 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6967 error ("default arguments are not allowed in declaration "
6968 "of friend template specialization %qD",
6975 error ("%<inline%> is not allowed in declaration of friend "
6976 "template specialization %qD",
6983 /* If this decl has namespace scope, set that up. */
6985 set_decl_namespace (decl, in_namespace, friendp);
6987 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6989 /* `main' and builtins have implicit 'C' linkage. */
6990 if ((MAIN_NAME_P (declarator)
6991 || (IDENTIFIER_LENGTH (declarator) > 10
6992 && IDENTIFIER_POINTER (declarator)[0] == '_'
6993 && IDENTIFIER_POINTER (declarator)[1] == '_'
6994 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6995 && current_lang_name == lang_name_cplusplus
6996 && ctype == NULL_TREE
6997 && DECL_FILE_SCOPE_P (decl))
6998 SET_DECL_LANGUAGE (decl, lang_c);
7000 /* Should probably propagate const out from type to decl I bet (mrs). */
7003 DECL_STATIC_FUNCTION_P (decl) = 1;
7004 DECL_CONTEXT (decl) = ctype;
7009 DECL_CONTEXT (decl) = ctype;
7011 check_class_member_definition_namespace (decl);
7014 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7016 if (processing_template_decl)
7017 error ("cannot declare %<::main%> to be a template");
7019 error ("cannot declare %<::main%> to be inline");
7021 error ("cannot declare %<::main%> to be static");
7026 /* Members of anonymous types and local classes have no linkage; make
7027 them internal. If a typedef is made later, this will be changed. */
7028 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7029 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7032 if (publicp && cxx_dialect == cxx98)
7034 /* [basic.link]: A name with no linkage (notably, the name of a class
7035 or enumeration declared in a local scope) shall not be used to
7036 declare an entity with linkage.
7038 DR 757 relaxes this restriction for C++0x. */
7039 t = no_linkage_check (TREE_TYPE (decl),
7040 /*relaxed_p=*/false);
7043 if (TYPE_ANONYMOUS_P (t))
7045 if (DECL_EXTERN_C_P (decl))
7046 /* Allow this; it's pretty common in C. */;
7049 permerror (input_location, "anonymous type with no linkage "
7050 "used to declare function %q#D with linkage",
7052 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7053 permerror (input_location, "%q+#D does not refer to the unqualified "
7054 "type, so it is not used for linkage",
7059 permerror (input_location, "type %qT with no linkage used to "
7060 "declare function %q#D with linkage", t, decl);
7064 TREE_PUBLIC (decl) = publicp;
7067 DECL_INTERFACE_KNOWN (decl) = 1;
7068 DECL_NOT_REALLY_EXTERN (decl) = 1;
7071 /* If the declaration was declared inline, mark it as such. */
7073 DECL_DECLARED_INLINE_P (decl) = 1;
7075 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7077 DECL_EXTERNAL (decl) = 1;
7078 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7081 ? G_("static member function %qD cannot have cv-qualifier")
7082 : G_("non-member function %qD cannot have cv-qualifier"),
7084 quals = TYPE_UNQUALIFIED;
7087 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7088 && !grok_op_properties (decl, /*complain=*/true))
7092 /* Make the init_value nonzero so pushdecl knows this is not
7093 tentative. error_mark_node is replaced later with the BLOCK. */
7094 DECL_INITIAL (decl) = error_mark_node;
7096 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7097 TREE_NOTHROW (decl) = 1;
7099 /* Caller will do the rest of this. */
7103 if (ctype != NULL_TREE)
7104 grokclassfn (ctype, decl, flags);
7106 decl = check_explicit_specialization (orig_declarator, decl,
7109 4 * (friendp != 0));
7110 if (decl == error_mark_node)
7115 cplus_decl_attributes (&decl, *attrlist, 0);
7116 *attrlist = NULL_TREE;
7119 /* Check main's type after attributes have been applied. */
7120 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7122 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7125 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7127 error ("%<::main%> must return %<int%>");
7128 newtype = build_function_type (integer_type_node, oldtypeargs);
7129 TREE_TYPE (decl) = newtype;
7132 check_main_parameter_types (decl);
7135 if (ctype != NULL_TREE
7136 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7139 tree old_decl = check_classfn (ctype, decl,
7140 (processing_template_decl
7141 > template_class_depth (ctype))
7142 ? current_template_parms
7145 if (old_decl == error_mark_node)
7153 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7154 /* Because grokfndecl is always supposed to return a
7155 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7156 here. We depend on our callers to figure out that its
7157 really a template that's being returned. */
7158 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7160 if (DECL_STATIC_FUNCTION_P (old_decl)
7161 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7162 /* Remove the `this' parm added by grokclassfn.
7163 XXX Isn't this done in start_function, too? */
7164 revert_static_member_fn (decl);
7165 if (DECL_ARTIFICIAL (old_decl))
7167 error ("definition of implicitly-declared %qD", old_decl);
7171 /* Since we've smashed OLD_DECL to its
7172 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7173 if (TREE_CODE (decl) == TEMPLATE_DECL)
7174 decl = DECL_TEMPLATE_RESULT (decl);
7176 /* Attempt to merge the declarations. This can fail, in
7177 the case of some invalid specialization declarations. */
7178 pushed_scope = push_scope (ctype);
7179 ok = duplicate_decls (decl, old_decl, friendp);
7181 pop_scope (pushed_scope);
7184 error ("no %q#D member function declared in class %qT",
7192 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7195 if (ctype == NULL_TREE || check)
7199 DECL_VIRTUAL_P (decl) = 1;
7204 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7205 the linkage that DECL will receive in the object file. */
7208 set_linkage_for_static_data_member (tree decl)
7210 /* A static data member always has static storage duration and
7211 external linkage. Note that static data members are forbidden in
7212 local classes -- the only situation in which a class has
7213 non-external linkage. */
7214 TREE_PUBLIC (decl) = 1;
7215 TREE_STATIC (decl) = 1;
7216 /* For non-template classes, static data members are always put
7217 out in exactly those files where they are defined, just as
7218 with ordinary namespace-scope variables. */
7219 if (!processing_template_decl)
7220 DECL_INTERFACE_KNOWN (decl) = 1;
7223 /* Create a VAR_DECL named NAME with the indicated TYPE.
7225 If SCOPE is non-NULL, it is the class type or namespace containing
7226 the variable. If SCOPE is NULL, the variable should is created in
7227 the innermost enclosings scope. */
7230 grokvardecl (tree type,
7232 const cp_decl_specifier_seq *declspecs,
7238 tree explicit_scope;
7240 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7242 /* Compute the scope in which to place the variable, but remember
7243 whether or not that scope was explicitly specified by the user. */
7244 explicit_scope = scope;
7247 /* An explicit "extern" specifier indicates a namespace-scope
7249 if (declspecs->storage_class == sc_extern)
7250 scope = current_decl_namespace ();
7251 else if (!at_function_scope_p ())
7252 scope = current_scope ();
7256 && (/* If the variable is a namespace-scope variable declared in a
7257 template, we need DECL_LANG_SPECIFIC. */
7258 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7259 /* Similarly for namespace-scope variables with language linkage
7261 || (TREE_CODE (scope) == NAMESPACE_DECL
7262 && current_lang_name != lang_name_cplusplus)
7263 /* Similarly for static data members. */
7265 decl = build_lang_decl (VAR_DECL, name, type);
7267 decl = build_decl (input_location, VAR_DECL, name, type);
7269 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7270 set_decl_namespace (decl, explicit_scope, 0);
7272 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7274 if (declspecs->storage_class == sc_extern)
7276 DECL_THIS_EXTERN (decl) = 1;
7277 DECL_EXTERNAL (decl) = !initialized;
7280 if (DECL_CLASS_SCOPE_P (decl))
7282 set_linkage_for_static_data_member (decl);
7283 /* This function is only called with out-of-class definitions. */
7284 DECL_EXTERNAL (decl) = 0;
7285 check_class_member_definition_namespace (decl);
7287 /* At top level, either `static' or no s.c. makes a definition
7288 (perhaps tentative), and absence of `static' makes it public. */
7289 else if (toplevel_bindings_p ())
7291 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7292 && (DECL_THIS_EXTERN (decl) || ! constp));
7293 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7295 /* Not at top level, only `static' makes a static definition. */
7298 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7299 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7302 if (declspecs->specs[(int)ds_thread])
7303 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7305 /* If the type of the decl has no linkage, make sure that we'll
7306 notice that in mark_used. */
7307 if (cxx_dialect > cxx98
7308 && decl_linkage (decl) != lk_none
7309 && DECL_LANG_SPECIFIC (decl) == NULL
7310 && !DECL_EXTERN_C_P (decl)
7311 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7312 retrofit_lang_decl (decl);
7314 if (TREE_PUBLIC (decl))
7316 /* [basic.link]: A name with no linkage (notably, the name of a class
7317 or enumeration declared in a local scope) shall not be used to
7318 declare an entity with linkage.
7320 DR 757 relaxes this restriction for C++0x. */
7321 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7322 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7325 if (TYPE_ANONYMOUS_P (t))
7327 if (DECL_EXTERN_C_P (decl))
7328 /* Allow this; it's pretty common in C. */
7332 /* DRs 132, 319 and 389 seem to indicate types with
7333 no linkage can only be used to declare extern "C"
7334 entities. Since it's not always an error in the
7335 ISO C++ 90 Standard, we only issue a warning. */
7336 warning (0, "anonymous type with no linkage used to declare "
7337 "variable %q#D with linkage", decl);
7338 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7339 warning (0, "%q+#D does not refer to the unqualified "
7340 "type, so it is not used for linkage",
7345 warning (0, "type %qT with no linkage used to declare variable "
7346 "%q#D with linkage", t, decl);
7350 DECL_INTERFACE_KNOWN (decl) = 1;
7355 /* Create and return a canonical pointer to member function type, for
7356 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7359 build_ptrmemfunc_type (tree type)
7363 tree unqualified_variant = NULL_TREE;
7365 if (type == error_mark_node)
7368 /* If a canonical type already exists for this type, use it. We use
7369 this method instead of type_hash_canon, because it only does a
7370 simple equality check on the list of field members. */
7372 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7375 /* Make sure that we always have the unqualified pointer-to-member
7377 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7379 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7381 t = make_class_type (RECORD_TYPE);
7382 xref_basetypes (t, NULL_TREE);
7384 /* Let the front end know this is a pointer to member function... */
7385 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7386 /* ... and not really a class type. */
7387 SET_CLASS_TYPE_P (t, 0);
7389 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7392 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7394 DECL_CHAIN (field) = fields;
7397 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7399 /* Zap out the name so that the back end will give us the debugging
7400 information for this anonymous RECORD_TYPE. */
7401 TYPE_NAME (t) = NULL_TREE;
7403 /* If this is not the unqualified form of this pointer-to-member
7404 type, set the TYPE_MAIN_VARIANT for this type to be the
7405 unqualified type. Since they are actually RECORD_TYPEs that are
7406 not variants of each other, we must do this manually.
7407 As we just built a new type there is no need to do yet another copy. */
7408 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7410 int type_quals = cp_type_quals (type);
7411 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7412 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7413 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7414 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7415 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7416 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7417 TREE_TYPE (TYPE_BINFO (t)) = t;
7420 /* Cache this pointer-to-member type so that we can find it again
7422 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7424 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7425 SET_TYPE_STRUCTURAL_EQUALITY (t);
7426 else if (TYPE_CANONICAL (type) != type)
7427 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7432 /* Create and return a pointer to data member type. */
7435 build_ptrmem_type (tree class_type, tree member_type)
7437 if (TREE_CODE (member_type) == METHOD_TYPE)
7439 cp_cv_quals quals = type_memfn_quals (member_type);
7440 member_type = build_memfn_type (member_type, class_type, quals);
7441 return build_ptrmemfunc_type (build_pointer_type (member_type));
7445 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7446 return build_offset_type (class_type, member_type);
7450 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7451 Check to see that the definition is valid. Issue appropriate error
7452 messages. Return 1 if the definition is particularly bad, or 0
7456 check_static_variable_definition (tree decl, tree type)
7458 /* If DECL is declared constexpr, we'll do the appropriate checks
7459 in check_initializer. */
7460 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7462 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7464 if (literal_type_p (type))
7465 error ("%<constexpr%> needed for in-class initialization of static "
7466 "data member %q#D of non-integral type", decl);
7468 error ("in-class initialization of static data member %q#D of "
7469 "non-literal type", decl);
7473 /* Motion 10 at San Diego: If a static const integral data member is
7474 initialized with an integral constant expression, the initializer
7475 may appear either in the declaration (within the class), or in
7476 the definition, but not both. If it appears in the class, the
7477 member is a member constant. The file-scope definition is always
7479 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7481 error ("invalid in-class initialization of static data member "
7482 "of non-integral type %qT",
7486 else if (!CP_TYPE_CONST_P (type))
7487 error ("ISO C++ forbids in-class initialization of non-const "
7488 "static member %qD",
7490 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7491 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7492 "%qD of non-integral type %qT", decl, type);
7497 /* Given the SIZE (i.e., number of elements) in an array, compute an
7498 appropriate index type for the array. If non-NULL, NAME is the
7499 name of the thing being declared. */
7502 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7507 tree abi_1_itype = NULL_TREE;
7509 if (error_operand_p (size))
7510 return error_mark_node;
7512 type = TREE_TYPE (size);
7513 /* type_dependent_expression_p? */
7514 if (!dependent_type_p (type))
7516 mark_rvalue_use (size);
7518 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7519 && TREE_SIDE_EFFECTS (size))
7520 /* In C++98, we mark a non-constant array bound with a magic
7521 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7524 size = fold_non_dependent_expr (size);
7526 if (CLASS_TYPE_P (type)
7527 && CLASSTYPE_LITERAL_P (type))
7529 size = build_expr_type_conversion (WANT_INT, size, true);
7530 if (size == error_mark_node)
7531 return error_mark_node;
7532 type = TREE_TYPE (size);
7533 /* We didn't support this case in GCC 3.2, so don't bother
7534 trying to model it now in ABI v1. */
7535 abi_1_itype = error_mark_node;
7538 size = maybe_constant_value (size);
7539 if (!TREE_CONSTANT (size))
7543 if (error_operand_p (size))
7544 return error_mark_node;
7546 /* The array bound must be an integer type. */
7547 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7549 if (!(complain & tf_error))
7550 return error_mark_node;
7552 error ("size of array %qD has non-integral type %qT", name, type);
7554 error ("size of array has non-integral type %qT", type);
7555 size = integer_one_node;
7556 type = TREE_TYPE (size);
7560 /* A type is dependent if it is...an array type constructed from any
7561 dependent type or whose size is specified by a constant expression
7562 that is value-dependent. */
7563 /* We can only call value_dependent_expression_p on integral constant
7564 expressions; treat non-constant expressions as dependent, too. */
7565 if (processing_template_decl
7566 && (dependent_type_p (type)
7567 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7569 /* We cannot do any checking for a SIZE that isn't known to be
7570 constant. Just build the index type and mark that it requires
7571 structural equality checks. */
7572 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7573 size, integer_one_node));
7574 TYPE_DEPENDENT_P (itype) = 1;
7575 TYPE_DEPENDENT_P_VALID (itype) = 1;
7576 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7580 if (!abi_version_at_least (2) && processing_template_decl
7581 && abi_1_itype == NULL_TREE)
7582 /* For abi-1, we handled all instances in templates the same way,
7583 even when they were non-dependent. This affects the manglings
7584 produced. So, we do the normal checking for non-dependent
7585 sizes, but at the end we'll return the same type that abi-1
7586 would have, but with TYPE_CANONICAL set to the "right"
7587 value that the current ABI would provide. */
7588 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7589 osize, integer_one_node));
7591 /* Normally, the array-bound will be a constant. */
7592 if (TREE_CODE (size) == INTEGER_CST)
7594 /* Check to see if the array bound overflowed. Make that an
7595 error, no matter how generous we're being. */
7596 constant_expression_error (size);
7598 /* An array must have a positive number of elements. */
7599 if (INT_CST_LT (size, integer_zero_node))
7601 if (!(complain & tf_error))
7602 return error_mark_node;
7604 error ("size of array %qD is negative", name);
7606 error ("size of array is negative");
7607 size = integer_one_node;
7609 /* As an extension we allow zero-sized arrays. */
7610 else if (integer_zerop (size))
7612 if (!(complain & tf_error))
7613 /* We must fail if performing argument deduction (as
7614 indicated by the state of complain), so that
7615 another substitution can be found. */
7616 return error_mark_node;
7617 else if (in_system_header)
7618 /* Allow them in system headers because glibc uses them. */;
7620 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7622 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7625 else if (TREE_CONSTANT (size)
7626 /* We don't allow VLAs at non-function scopes, or during
7627 tentative template substitution. */
7628 || !at_function_scope_p () || !(complain & tf_error))
7630 if (!(complain & tf_error))
7631 return error_mark_node;
7632 /* `(int) &fn' is not a valid array bound. */
7634 error ("size of array %qD is not an integral constant-expression",
7637 error ("size of array is not an integral constant-expression");
7638 size = integer_one_node;
7640 else if (pedantic && warn_vla != 0)
7643 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7645 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7647 else if (warn_vla > 0)
7651 "variable length array %qD is used", name);
7654 "variable length array is used");
7657 if (processing_template_decl && !TREE_CONSTANT (size))
7658 /* A variable sized array. */
7659 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7662 HOST_WIDE_INT saved_processing_template_decl;
7664 /* Compute the index of the largest element in the array. It is
7665 one less than the number of elements in the array. We save
7666 and restore PROCESSING_TEMPLATE_DECL so that computations in
7667 cp_build_binary_op will be appropriately folded. */
7668 saved_processing_template_decl = processing_template_decl;
7669 processing_template_decl = 0;
7670 itype = cp_build_binary_op (input_location,
7672 cp_convert (ssizetype, size),
7673 cp_convert (ssizetype, integer_one_node),
7674 tf_warning_or_error);
7675 itype = fold (itype);
7676 processing_template_decl = saved_processing_template_decl;
7678 if (!TREE_CONSTANT (itype))
7679 /* A variable sized array. */
7680 itype = variable_size (itype);
7681 /* Make sure that there was no overflow when creating to a signed
7682 index type. (For example, on a 32-bit machine, an array with
7683 size 2^32 - 1 is too big.) */
7684 else if (TREE_CODE (itype) == INTEGER_CST
7685 && TREE_OVERFLOW (itype))
7687 if (!(complain & tf_error))
7688 return error_mark_node;
7689 error ("overflow in array dimension");
7690 TREE_OVERFLOW (itype) = 0;
7694 /* Create and return the appropriate index type. */
7695 if (abi_1_itype && abi_1_itype != error_mark_node)
7697 tree t = build_index_type (itype);
7698 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7699 itype = abi_1_itype;
7702 itype = build_index_type (itype);
7704 /* If the index type were dependent, we would have returned early, so
7705 remember that it isn't. */
7706 TYPE_DEPENDENT_P (itype) = 0;
7707 TYPE_DEPENDENT_P_VALID (itype) = 1;
7711 /* Returns the scope (if any) in which the entity declared by
7712 DECLARATOR will be located. If the entity was declared with an
7713 unqualified name, NULL_TREE is returned. */
7716 get_scope_of_declarator (const cp_declarator *declarator)
7718 while (declarator && declarator->kind != cdk_id)
7719 declarator = declarator->declarator;
7721 /* If the declarator-id is a SCOPE_REF, the scope in which the
7722 declaration occurs is the first operand. */
7724 && declarator->u.id.qualifying_scope)
7725 return declarator->u.id.qualifying_scope;
7727 /* Otherwise, the declarator is not a qualified name; the entity will
7728 be declared in the current scope. */
7732 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7733 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7737 create_array_type_for_decl (tree name, tree type, tree size)
7739 tree itype = NULL_TREE;
7741 /* If things have already gone awry, bail now. */
7742 if (type == error_mark_node || size == error_mark_node)
7743 return error_mark_node;
7745 /* If there are some types which cannot be array elements,
7746 issue an error-message and return. */
7747 switch (TREE_CODE (type))
7751 error ("declaration of %qD as array of void", name);
7753 error ("creating array of void");
7754 return error_mark_node;
7758 error ("declaration of %qD as array of functions", name);
7760 error ("creating array of functions");
7761 return error_mark_node;
7763 case REFERENCE_TYPE:
7765 error ("declaration of %qD as array of references", name);
7767 error ("creating array of references");
7768 return error_mark_node;
7772 error ("declaration of %qD as array of function members", name);
7774 error ("creating array of function members");
7775 return error_mark_node;
7783 The constant expressions that specify the bounds of the arrays
7784 can be omitted only for the first member of the sequence. */
7785 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7788 error ("declaration of %qD as multidimensional array must "
7789 "have bounds for all dimensions except the first",
7792 error ("multidimensional array must have bounds for all "
7793 "dimensions except the first");
7795 return error_mark_node;
7798 /* Figure out the index type for the array. */
7800 itype = compute_array_index_type (name, size, tf_warning_or_error);
7803 T is called the array element type; this type shall not be [...] an
7804 abstract class type. */
7805 abstract_virtuals_error (name, type);
7807 return build_cplus_array_type (type, itype);
7810 /* Check that it's OK to declare a function with the indicated TYPE.
7811 SFK indicates the kind of special function (if any) that this
7812 function is. OPTYPE is the type given in a conversion operator
7813 declaration, or the class type for a constructor/destructor.
7814 Returns the actual return type of the function; that
7815 may be different than TYPE if an error occurs, or for certain
7816 special functions. */
7819 check_special_function_return_type (special_function_kind sfk,
7825 case sfk_constructor:
7827 error ("return type specification for constructor invalid");
7829 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7830 type = build_pointer_type (optype);
7832 type = void_type_node;
7835 case sfk_destructor:
7837 error ("return type specification for destructor invalid");
7838 /* We can't use the proper return type here because we run into
7839 problems with ambiguous bases and covariant returns.
7840 Java classes are left unchanged because (void *) isn't a valid
7841 Java type, and we don't want to change the Java ABI. */
7842 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7843 type = build_pointer_type (void_type_node);
7845 type = void_type_node;
7848 case sfk_conversion:
7850 error ("return type specified for %<operator %T%>", optype);
7861 /* A variable or data member (whose unqualified name is IDENTIFIER)
7862 has been declared with the indicated TYPE. If the TYPE is not
7863 acceptable, issue an error message and return a type to use for
7864 error-recovery purposes. */
7867 check_var_type (tree identifier, tree type)
7869 if (VOID_TYPE_P (type))
7872 error ("unnamed variable or field declared void");
7873 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7875 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7876 error ("variable or field %qE declared void", identifier);
7879 error ("variable or field declared void");
7880 type = error_mark_node;
7886 /* Given declspecs and a declarator (abstract or otherwise), determine
7887 the name and type of the object declared and construct a DECL node
7890 DECLSPECS points to the representation of declaration-specifier
7891 sequence that precedes declarator.
7893 DECL_CONTEXT says which syntactic context this declaration is in:
7894 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7895 FUNCDEF for a function definition. Like NORMAL but a few different
7896 error messages in each case. Return value may be zero meaning
7897 this definition is too screwy to try to parse.
7898 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7899 handle member functions (which have FIELD context).
7900 Return value may be zero meaning this definition is too screwy to
7902 PARM for a parameter declaration (either within a function prototype
7903 or before a function body). Make a PARM_DECL, or return void_type_node.
7904 TPARM for a template parameter declaration.
7905 CATCHPARM for a parameter declaration before a catch clause.
7906 TYPENAME if for a typename (in a cast or sizeof).
7907 Don't make a DECL node; just return the ..._TYPE node.
7908 FIELD for a struct or union field; make a FIELD_DECL.
7909 BITFIELD for a field with specified width.
7911 INITIALIZED is as for start_decl.
7913 ATTRLIST is a pointer to the list of attributes, which may be NULL
7914 if there are none; *ATTRLIST may be modified if attributes from inside
7915 the declarator should be applied to the declaration.
7917 When this function is called, scoping variables (such as
7918 CURRENT_CLASS_TYPE) should reflect the scope in which the
7919 declaration occurs, not the scope in which the new declaration will
7920 be placed. For example, on:
7924 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7927 Returns a DECL (if a declarator is present), a TYPE (if there is no
7928 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7932 grokdeclarator (const cp_declarator *declarator,
7933 const cp_decl_specifier_seq *declspecs,
7934 enum decl_context decl_context,
7938 tree type = NULL_TREE;
7940 int explicit_int128 = 0;
7941 int virtualp, explicitp, friendp, inlinep, staticp;
7942 int explicit_int = 0;
7943 int explicit_char = 0;
7944 int defaulted_int = 0;
7945 tree dependent_name = NULL_TREE;
7947 tree typedef_decl = NULL_TREE;
7948 const char *name = NULL;
7949 tree typedef_type = NULL_TREE;
7950 /* True if this declarator is a function definition. */
7951 bool funcdef_flag = false;
7952 cp_declarator_kind innermost_code = cdk_error;
7955 /* See the code below that used this. */
7956 tree decl_attr = NULL_TREE;
7959 /* Keep track of what sort of function is being processed
7960 so that we can warn about default return values, or explicit
7961 return values which do not match prescribed defaults. */
7962 special_function_kind sfk = sfk_none;
7964 tree dname = NULL_TREE;
7965 tree ctor_return_type = NULL_TREE;
7966 enum overload_flags flags = NO_SPECIAL;
7967 /* cv-qualifiers that apply to the declarator, for a declaration of
7968 a member function. */
7969 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7970 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7972 tree raises = NULL_TREE;
7973 int template_count = 0;
7974 tree returned_attrs = NULL_TREE;
7975 tree parms = NULL_TREE;
7976 const cp_declarator *id_declarator;
7977 /* The unqualified name of the declarator; either an
7978 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7979 tree unqualified_id;
7980 /* The class type, if any, in which this entity is located,
7981 or NULL_TREE if none. Note that this value may be different from
7982 the current class type; for example if an attempt is made to declare
7983 "A::f" inside "B", this value will be "A". */
7984 tree ctype = current_class_type;
7985 /* The NAMESPACE_DECL for the namespace in which this entity is
7986 located. If an unqualified name is used to declare the entity,
7987 this value will be NULL_TREE, even if the entity is located at
7989 tree in_namespace = NULL_TREE;
7990 cp_storage_class storage_class;
7991 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7992 bool type_was_error_mark_node = false;
7993 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7994 bool template_type_arg = false;
7995 bool template_parm_flag = false;
7996 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7999 signed_p = declspecs->specs[(int)ds_signed];
8000 unsigned_p = declspecs->specs[(int)ds_unsigned];
8001 short_p = declspecs->specs[(int)ds_short];
8002 long_p = declspecs->specs[(int)ds_long];
8003 longlong = declspecs->specs[(int)ds_long] >= 2;
8004 explicit_int128 = declspecs->explicit_int128_p;
8005 thread_p = declspecs->specs[(int)ds_thread];
8007 if (decl_context == FUNCDEF)
8008 funcdef_flag = true, decl_context = NORMAL;
8009 else if (decl_context == MEMFUNCDEF)
8010 funcdef_flag = true, decl_context = FIELD;
8011 else if (decl_context == BITFIELD)
8012 bitfield = 1, decl_context = FIELD;
8013 else if (decl_context == TEMPLATE_TYPE_ARG)
8014 template_type_arg = true, decl_context = TYPENAME;
8015 else if (decl_context == TPARM)
8016 template_parm_flag = true, decl_context = PARM;
8018 if (initialized > 1)
8019 funcdef_flag = true;
8021 /* Look inside a declarator for the name being declared
8022 and get it as a string, for an error message. */
8023 for (id_declarator = declarator;
8025 id_declarator = id_declarator->declarator)
8027 if (id_declarator->kind != cdk_id)
8028 innermost_code = id_declarator->kind;
8030 switch (id_declarator->kind)
8033 if (id_declarator->declarator
8034 && id_declarator->declarator->kind == cdk_id)
8036 sfk = id_declarator->declarator->u.id.sfk;
8037 if (sfk == sfk_destructor)
8044 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8045 tree decl = id_declarator->u.id.unqualified_name;
8048 if (qualifying_scope)
8050 if (at_function_scope_p ())
8054 A declarator-id shall not be qualified except
8057 None of the cases are permitted in block
8059 if (qualifying_scope == global_namespace)
8060 error ("invalid use of qualified-name %<::%D%>",
8062 else if (TYPE_P (qualifying_scope))
8063 error ("invalid use of qualified-name %<%T::%D%>",
8064 qualifying_scope, decl);
8066 error ("invalid use of qualified-name %<%D::%D%>",
8067 qualifying_scope, decl);
8068 return error_mark_node;
8070 else if (TYPE_P (qualifying_scope))
8072 ctype = qualifying_scope;
8073 if (innermost_code != cdk_function
8074 && current_class_type
8075 && !UNIQUELY_DERIVED_FROM_P (ctype,
8076 current_class_type))
8078 error ("type %qT is not derived from type %qT",
8079 ctype, current_class_type);
8080 return error_mark_node;
8083 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8084 in_namespace = qualifying_scope;
8086 switch (TREE_CODE (decl))
8092 if (innermost_code != cdk_function)
8094 error ("declaration of %qD as non-function", decl);
8095 return error_mark_node;
8097 else if (!qualifying_scope
8098 && !(current_class_type && at_class_scope_p ()))
8100 error ("declaration of %qD as non-member", decl);
8101 return error_mark_node;
8104 type = TREE_OPERAND (decl, 0);
8106 type = constructor_name (type);
8107 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8112 case TEMPLATE_ID_EXPR:
8114 tree fns = TREE_OPERAND (decl, 0);
8117 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8119 gcc_assert (is_overloaded_fn (dname));
8120 dname = DECL_NAME (get_first_fn (dname));
8125 case IDENTIFIER_NODE:
8126 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8129 if (C_IS_RESERVED_WORD (dname))
8131 error ("declarator-id missing; using reserved word %qD",
8133 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8135 else if (!IDENTIFIER_TYPENAME_P (dname))
8136 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8139 gcc_assert (flags == NO_SPECIAL);
8140 flags = TYPENAME_FLAG;
8141 ctor_return_type = TREE_TYPE (dname);
8142 sfk = sfk_conversion;
8143 if (is_typename_at_global_scope (dname))
8144 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8146 name = "<invalid operator>";
8163 return error_mark_node;
8168 if (id_declarator->kind == cdk_id)
8174 The declarator in a function-definition shall have the form
8175 D1 ( parameter-declaration-clause) ... */
8176 if (funcdef_flag && innermost_code != cdk_function)
8178 error ("function definition does not declare parameters");
8179 return error_mark_node;
8182 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8183 && innermost_code != cdk_function
8184 && ! (ctype && !declspecs->any_specifiers_p))
8186 error ("declaration of %qD as non-function", dname);
8187 return error_mark_node;
8190 /* Anything declared one level down from the top level
8191 must be one of the parameters of a function
8192 (because the body is at least two levels down). */
8194 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8195 by not allowing C++ class definitions to specify their parameters
8196 with xdecls (must be spec.d in the parmlist).
8198 Since we now wait to push a class scope until we are sure that
8199 we are in a legitimate method context, we must set oldcname
8200 explicitly (since current_class_name is not yet alive).
8202 We also want to avoid calling this a PARM if it is in a namespace. */
8204 if (decl_context == NORMAL && !toplevel_bindings_p ())
8206 struct cp_binding_level *b = current_binding_level;
8207 current_binding_level = b->level_chain;
8208 if (current_binding_level != 0 && toplevel_bindings_p ())
8209 decl_context = PARM;
8210 current_binding_level = b;
8214 name = decl_context == PARM ? "parameter" : "type name";
8216 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8218 error ("%<constexpr%> cannot appear in a typedef declaration");
8219 return error_mark_node;
8222 /* If there were multiple types specified in the decl-specifier-seq,
8223 issue an error message. */
8224 if (declspecs->multiple_types_p)
8226 error ("two or more data types in declaration of %qs", name);
8227 return error_mark_node;
8230 if (declspecs->conflicting_specifiers_p)
8232 error ("conflicting specifiers in declaration of %qs", name);
8233 return error_mark_node;
8236 /* Extract the basic type from the decl-specifier-seq. */
8237 type = declspecs->type;
8238 if (type == error_mark_node)
8241 type_was_error_mark_node = true;
8243 /* If the entire declaration is itself tagged as deprecated then
8244 suppress reports of deprecated items. */
8245 if (type && TREE_DEPRECATED (type)
8246 && deprecated_state != DEPRECATED_SUPPRESS)
8247 warn_deprecated_use (type, NULL_TREE);
8248 if (type && TREE_CODE (type) == TYPE_DECL)
8250 typedef_decl = type;
8251 type = TREE_TYPE (typedef_decl);
8252 if (TREE_DEPRECATED (type)
8253 && DECL_ARTIFICIAL (typedef_decl)
8254 && deprecated_state != DEPRECATED_SUPPRESS)
8255 warn_deprecated_use (type, NULL_TREE);
8257 /* No type at all: default to `int', and set DEFAULTED_INT
8258 because it was not a user-defined typedef. */
8259 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8261 /* These imply 'int'. */
8262 type = integer_type_node;
8266 explicit_int = declspecs->explicit_int_p;
8267 explicit_char = declspecs->explicit_char_p;
8270 /* See the code below that used this. */
8272 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8274 typedef_type = type;
8277 if (sfk != sfk_conversion)
8278 ctor_return_type = ctype;
8280 if (sfk != sfk_none)
8281 type = check_special_function_return_type (sfk, type,
8283 else if (type == NULL_TREE)
8289 /* We handle `main' specially here, because 'main () { }' is so
8290 common. With no options, it is allowed. With -Wreturn-type,
8291 it is a warning. It is only an error with -pedantic-errors. */
8292 is_main = (funcdef_flag
8293 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8294 && MAIN_NAME_P (dname)
8295 && ctype == NULL_TREE
8296 && in_namespace == NULL_TREE
8297 && current_namespace == global_namespace);
8299 if (type_was_error_mark_node)
8300 /* We've already issued an error, don't complain more. */;
8301 else if (in_system_header || flag_ms_extensions)
8302 /* Allow it, sigh. */;
8304 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8306 pedwarn (input_location, OPT_pedantic,
8307 "ISO C++ forbids declaration of %qs with no type", name);
8309 warning (OPT_Wreturn_type,
8310 "ISO C++ forbids declaration of %qs with no type", name);
8312 type = integer_type_node;
8317 /* Now process the modifiers that were specified
8318 and check for invalid combinations. */
8320 /* Long double is a special combination. */
8321 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8324 type = cp_build_qualified_type (long_double_type_node,
8325 cp_type_quals (type));
8328 /* Check all other uses of type modifiers. */
8330 if (unsigned_p || signed_p || long_p || short_p)
8334 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8335 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8336 else if (signed_p && unsigned_p)
8337 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8338 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8339 error ("%<long long%> invalid for %qs", name);
8340 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8341 error ("%<__int128%> invalid for %qs", name);
8342 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8343 error ("%<long%> invalid for %qs", name);
8344 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8345 error ("%<short%> invalid for %qs", name);
8346 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8347 error ("%<long%> or %<short%> invalid for %qs", name);
8348 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8349 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8350 else if ((long_p || short_p) && explicit_char)
8351 error ("%<long%> or %<short%> specified with char for %qs", name);
8352 else if (long_p && short_p)
8353 error ("%<long%> and %<short%> specified together for %qs", name);
8354 else if (type == char16_type_node || type == char32_type_node)
8356 if (signed_p || unsigned_p)
8357 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8358 else if (short_p || long_p)
8359 error ("%<short%> or %<long%> invalid for %qs", name);
8364 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8366 pedwarn (input_location, OPT_pedantic,
8367 "long, short, signed or unsigned used invalidly for %qs",
8369 if (flag_pedantic_errors)
8372 if (explicit_int128)
8374 if (int128_integer_type_node == NULL_TREE)
8376 error ("%<__int128%> is not supported by this target");
8381 pedwarn (input_location, OPT_pedantic,
8382 "ISO C++ does not support %<__int128%> for %qs",
8384 if (flag_pedantic_errors)
8390 /* Discard the type modifiers if they are invalid. */
8398 explicit_int128 = false;
8402 /* Decide whether an integer type is signed or not.
8403 Optionally treat bitfields as signed by default. */
8407 It is implementation-defined whether a plain (neither
8408 explicitly signed or unsigned) char, short, int, or long
8409 bit-field is signed or unsigned.
8411 Naturally, we extend this to long long as well. Note that
8412 this does not include wchar_t. */
8413 || (bitfield && !flag_signed_bitfields
8415 /* A typedef for plain `int' without `signed' can be
8416 controlled just like plain `int', but a typedef for
8417 `signed int' cannot be so controlled. */
8419 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8420 && TREE_CODE (type) == INTEGER_TYPE
8421 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8423 if (explicit_int128)
8424 type = int128_unsigned_type_node;
8426 type = long_long_unsigned_type_node;
8428 type = long_unsigned_type_node;
8430 type = short_unsigned_type_node;
8431 else if (type == char_type_node)
8432 type = unsigned_char_type_node;
8433 else if (typedef_decl)
8434 type = unsigned_type_for (type);
8436 type = unsigned_type_node;
8438 else if (signed_p && type == char_type_node)
8439 type = signed_char_type_node;
8440 else if (explicit_int128)
8441 type = int128_integer_type_node;
8443 type = long_long_integer_type_node;
8445 type = long_integer_type_node;
8447 type = short_integer_type_node;
8449 if (declspecs->specs[(int)ds_complex])
8451 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8452 error ("complex invalid for %qs", name);
8453 /* If we just have "complex", it is equivalent to
8454 "complex double", but if any modifiers at all are specified it is
8455 the complex form of TYPE. E.g, "complex short" is
8456 "complex short int". */
8457 else if (defaulted_int && ! longlong && ! explicit_int128
8458 && ! (long_p || short_p || signed_p || unsigned_p))
8459 type = complex_double_type_node;
8460 else if (type == integer_type_node)
8461 type = complex_integer_type_node;
8462 else if (type == float_type_node)
8463 type = complex_float_type_node;
8464 else if (type == double_type_node)
8465 type = complex_double_type_node;
8466 else if (type == long_double_type_node)
8467 type = complex_long_double_type_node;
8469 type = build_complex_type (type);
8472 type_quals = TYPE_UNQUALIFIED;
8473 if (declspecs->specs[(int)ds_const])
8474 type_quals |= TYPE_QUAL_CONST;
8475 if (declspecs->specs[(int)ds_volatile])
8476 type_quals |= TYPE_QUAL_VOLATILE;
8477 if (declspecs->specs[(int)ds_restrict])
8478 type_quals |= TYPE_QUAL_RESTRICT;
8479 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8480 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8483 type_quals |= cp_type_quals (type);
8484 type = cp_build_qualified_type_real
8485 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8486 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8487 /* We might have ignored or rejected some of the qualifiers. */
8488 type_quals = cp_type_quals (type);
8491 inlinep = !! declspecs->specs[(int)ds_inline];
8492 virtualp = !! declspecs->specs[(int)ds_virtual];
8493 explicitp = !! declspecs->specs[(int)ds_explicit];
8495 storage_class = declspecs->storage_class;
8496 if (storage_class == sc_static)
8497 staticp = 1 + (decl_context == FIELD);
8499 if (virtualp && staticp == 2)
8501 error ("member %qD cannot be declared both virtual and static", dname);
8502 storage_class = sc_none;
8505 friendp = !! declspecs->specs[(int)ds_friend];
8507 if (dependent_name && !friendp)
8509 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8510 return error_mark_node;
8513 /* Issue errors about use of storage classes for parameters. */
8514 if (decl_context == PARM)
8516 if (declspecs->specs[(int)ds_typedef])
8518 error ("typedef declaration invalid in parameter declaration");
8519 return error_mark_node;
8521 else if (template_parm_flag && storage_class != sc_none)
8523 error ("storage class specified for template parameter %qs", name);
8524 return error_mark_node;
8526 else if (storage_class == sc_static
8527 || storage_class == sc_extern
8529 error ("storage class specifiers invalid in parameter declarations");
8531 if (type_uses_auto (type))
8533 error ("parameter declared %<auto%>");
8534 type = error_mark_node;
8537 /* Function parameters cannot be constexpr. If we saw one, moan
8538 and pretend it wasn't there. */
8541 error ("a parameter cannot be declared %<constexpr%>");
8546 /* Give error if `virtual' is used outside of class declaration. */
8548 && (current_class_name == NULL_TREE || decl_context != FIELD))
8550 error ("%<virtual%> outside class declaration");
8554 /* Static anonymous unions are dealt with here. */
8555 if (staticp && decl_context == TYPENAME
8557 && ANON_AGGR_TYPE_P (declspecs->type))
8558 decl_context = FIELD;
8560 /* Warn about storage classes that are invalid for certain
8561 kinds of declarations (parameters, typenames, etc.). */
8564 && storage_class != sc_extern
8565 && storage_class != sc_static)
8566 || declspecs->specs[(int)ds_typedef]))
8568 error ("multiple storage classes in declaration of %qs", name);
8571 if (decl_context != NORMAL
8572 && ((storage_class != sc_none
8573 && storage_class != sc_mutable)
8576 if ((decl_context == PARM || decl_context == CATCHPARM)
8577 && (storage_class == sc_register
8578 || storage_class == sc_auto))
8580 else if (declspecs->specs[(int)ds_typedef])
8582 else if (decl_context == FIELD
8583 /* C++ allows static class elements. */
8584 && storage_class == sc_static)
8585 /* C++ also allows inlines and signed and unsigned elements,
8586 but in those cases we don't come in here. */
8590 if (decl_context == FIELD)
8591 error ("storage class specified for %qs", name);
8594 if (decl_context == PARM || decl_context == CATCHPARM)
8595 error ("storage class specified for parameter %qs", name);
8597 error ("storage class specified for typename");
8599 if (storage_class == sc_register
8600 || storage_class == sc_auto
8601 || storage_class == sc_extern
8603 storage_class = sc_none;
8606 else if (storage_class == sc_extern && funcdef_flag
8607 && ! toplevel_bindings_p ())
8608 error ("nested function %qs declared %<extern%>", name);
8609 else if (toplevel_bindings_p ())
8611 if (storage_class == sc_auto)
8612 error ("top-level declaration of %qs specifies %<auto%>", name);
8615 && storage_class != sc_extern
8616 && storage_class != sc_static)
8618 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8623 if (storage_class && friendp)
8625 error ("storage class specifiers invalid in friend function declarations");
8626 storage_class = sc_none;
8631 unqualified_id = NULL_TREE;
8634 unqualified_id = id_declarator->u.id.unqualified_name;
8635 switch (TREE_CODE (unqualified_id))
8638 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8639 if (TYPE_P (unqualified_id))
8640 unqualified_id = constructor_name (unqualified_id);
8643 case IDENTIFIER_NODE:
8644 case TEMPLATE_ID_EXPR:
8652 /* Determine the type of the entity declared by recurring on the
8654 for (; declarator; declarator = declarator->declarator)
8656 const cp_declarator *inner_declarator;
8659 if (type == error_mark_node)
8660 return error_mark_node;
8662 attrs = declarator->attributes;
8668 if (declarator == NULL || declarator->kind == cdk_id)
8669 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8670 if (declarator->kind == cdk_function)
8671 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8672 if (declarator->kind == cdk_array)
8673 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8674 returned_attrs = decl_attributes (&type,
8675 chainon (returned_attrs, attrs),
8679 if (declarator->kind == cdk_id)
8682 inner_declarator = declarator->declarator;
8684 switch (declarator->kind)
8687 type = create_array_type_for_decl (dname, type,
8688 declarator->u.array.bounds);
8696 /* Declaring a function type.
8697 Make sure we have a valid type for the function to return. */
8699 if (type_quals != TYPE_UNQUALIFIED)
8701 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8702 warning (OPT_Wignored_qualifiers,
8703 "type qualifiers ignored on function return type");
8704 /* We now know that the TYPE_QUALS don't apply to the
8705 decl, but to its return type. */
8706 type_quals = TYPE_UNQUALIFIED;
8708 errmsg = targetm.invalid_return_type (type);
8712 type = integer_type_node;
8715 /* Error about some types functions can't return. */
8717 if (TREE_CODE (type) == FUNCTION_TYPE)
8719 error ("%qs declared as function returning a function", name);
8720 return error_mark_node;
8722 if (TREE_CODE (type) == ARRAY_TYPE)
8724 error ("%qs declared as function returning an array", name);
8725 return error_mark_node;
8728 /* Pick up type qualifiers which should be applied to `this'. */
8729 memfn_quals = declarator->u.function.qualifiers;
8731 /* Pick up the exception specifications. */
8732 raises = declarator->u.function.exception_specification;
8734 /* Say it's a definition only for the CALL_EXPR
8735 closest to the identifier. */
8736 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8738 /* Handle a late-specified return type. */
8741 if (type_uses_auto (type))
8743 if (!declarator->u.function.late_return_type)
8745 error ("%qs function uses %<auto%> type specifier without"
8746 " late return type", name);
8747 return error_mark_node;
8749 else if (!is_auto (type))
8751 error ("%qs function with late return type has"
8752 " %qT as its type rather than plain %<auto%>",
8754 return error_mark_node;
8757 else if (declarator->u.function.late_return_type)
8759 error ("%qs function with late return type not declared"
8760 " with %<auto%> type specifier", name);
8761 return error_mark_node;
8764 type = splice_late_return_type
8765 (type, declarator->u.function.late_return_type);
8766 if (type == error_mark_node)
8767 return error_mark_node;
8769 if (ctype == NULL_TREE
8770 && decl_context == FIELD
8772 && (friendp == 0 || dname == current_class_name))
8773 ctype = current_class_type;
8775 if (ctype && (sfk == sfk_constructor
8776 || sfk == sfk_destructor))
8778 /* We are within a class's scope. If our declarator name
8779 is the same as the class name, and we are defining
8780 a function, then it is a constructor/destructor, and
8781 therefore returns a void type. */
8783 /* ISO C++ 12.4/2. A destructor may not be declared
8784 const or volatile. A destructor may not be
8787 ISO C++ 12.1. A constructor may not be declared
8788 const or volatile. A constructor may not be
8789 virtual. A constructor may not be static. */
8791 error ((flags == DTOR_FLAG)
8792 ? "destructor cannot be static member function"
8793 : "constructor cannot be static member function");
8796 error ((flags == DTOR_FLAG)
8797 ? "destructors may not be cv-qualified"
8798 : "constructors may not be cv-qualified");
8799 memfn_quals = TYPE_UNQUALIFIED;
8802 if (decl_context == FIELD
8803 && !member_function_or_else (ctype,
8806 return error_mark_node;
8808 if (flags != DTOR_FLAG)
8810 /* It's a constructor. */
8815 permerror (input_location, "constructors cannot be declared virtual");
8818 if (decl_context == FIELD
8819 && sfk != sfk_constructor)
8820 return error_mark_node;
8822 if (decl_context == FIELD)
8828 error ("can%'t initialize friend function %qs", name);
8831 /* Cannot be both friend and virtual. */
8832 error ("virtual functions cannot be friends");
8835 if (decl_context == NORMAL)
8836 error ("friend declaration not in class definition");
8837 if (current_function_decl && funcdef_flag)
8838 error ("can%'t define friend function %qs in a local "
8842 else if (ctype && sfk == sfk_conversion)
8846 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8851 arg_types = grokparms (declarator->u.function.parameters,
8854 if (inner_declarator
8855 && inner_declarator->kind == cdk_id
8856 && inner_declarator->u.id.sfk == sfk_destructor
8857 && arg_types != void_list_node)
8859 error ("destructors may not have parameters");
8860 arg_types = void_list_node;
8864 type = build_function_type (type, arg_types);
8871 /* Filter out pointers-to-references and references-to-references.
8872 We can get these if a TYPE_DECL is used. */
8874 if (TREE_CODE (type) == REFERENCE_TYPE)
8876 if (declarator->kind != cdk_reference)
8878 error ("cannot declare pointer to %q#T", type);
8879 type = TREE_TYPE (type);
8882 /* In C++0x, we allow reference to reference declarations
8883 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8884 and template type arguments [14.3.1/4 temp.arg.type]. The
8885 check for direct reference to reference declarations, which
8886 are still forbidden, occurs below. Reasoning behind the change
8887 can be found in DR106, DR540, and the rvalue reference
8889 else if (cxx_dialect == cxx98)
8891 error ("cannot declare reference to %q#T", type);
8892 type = TREE_TYPE (type);
8895 else if (VOID_TYPE_P (type))
8897 if (declarator->kind == cdk_reference)
8898 error ("cannot declare reference to %q#T", type);
8899 else if (declarator->kind == cdk_ptrmem)
8900 error ("cannot declare pointer to %q#T member", type);
8903 /* We now know that the TYPE_QUALS don't apply to the decl,
8904 but to the target of the pointer. */
8905 type_quals = TYPE_UNQUALIFIED;
8907 if (declarator->kind == cdk_ptrmem
8908 && (TREE_CODE (type) == FUNCTION_TYPE
8909 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8911 memfn_quals |= type_memfn_quals (type);
8912 type = build_memfn_type (type,
8913 declarator->u.pointer.class_type,
8915 if (type == error_mark_node)
8916 return error_mark_node;
8917 memfn_quals = TYPE_UNQUALIFIED;
8920 if (TREE_CODE (type) == FUNCTION_TYPE
8921 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8922 error (declarator->kind == cdk_reference
8923 ? G_("cannot declare reference to qualified function type %qT")
8924 : G_("cannot declare pointer to qualified function type %qT"),
8927 /* When the pointed-to type involves components of variable size,
8928 care must be taken to ensure that the size evaluation code is
8929 emitted early enough to dominate all the possible later uses
8930 and late enough for the variables on which it depends to have
8933 This is expected to happen automatically when the pointed-to
8934 type has a name/declaration of it's own, but special attention
8935 is required if the type is anonymous.
8937 We handle the NORMAL and FIELD contexts here by inserting a
8938 dummy statement that just evaluates the size at a safe point
8939 and ensures it is not deferred until e.g. within a deeper
8940 conditional context (c++/43555).
8942 We expect nothing to be needed here for PARM or TYPENAME.
8943 Evaluating the size at this point for TYPENAME would
8944 actually be incorrect, as we might be in the middle of an
8945 expression with side effects on the pointed-to type size
8946 "arguments" prior to the pointer declaration point and the
8947 size evaluation could end up prior to the side effects. */
8949 if (!TYPE_NAME (type)
8950 && (decl_context == NORMAL || decl_context == FIELD)
8951 && at_function_scope_p ()
8952 && variably_modified_type_p (type, NULL_TREE))
8953 finish_expr_stmt (TYPE_SIZE (type));
8955 if (declarator->kind == cdk_reference)
8957 /* In C++0x, the type we are creating a reference to might be
8958 a typedef which is itself a reference type. In that case,
8959 we follow the reference collapsing rules in
8960 [7.1.3/8 dcl.typedef] to create the final reference type:
8962 "If a typedef TD names a type that is a reference to a type
8963 T, an attempt to create the type 'lvalue reference to cv TD'
8964 creates the type 'lvalue reference to T,' while an attempt
8965 to create the type "rvalue reference to cv TD' creates the
8968 if (!VOID_TYPE_P (type))
8969 type = cp_build_reference_type
8970 ((TREE_CODE (type) == REFERENCE_TYPE
8971 ? TREE_TYPE (type) : type),
8972 (declarator->u.reference.rvalue_ref
8973 && (TREE_CODE(type) != REFERENCE_TYPE
8974 || TYPE_REF_IS_RVALUE (type))));
8976 /* In C++0x, we need this check for direct reference to
8977 reference declarations, which are forbidden by
8978 [8.3.2/5 dcl.ref]. Reference to reference declarations
8979 are only allowed indirectly through typedefs and template
8980 type arguments. Example:
8982 void foo(int & &); // invalid ref-to-ref decl
8984 typedef int & int_ref;
8985 void foo(int_ref &); // valid ref-to-ref decl
8987 if (inner_declarator && inner_declarator->kind == cdk_reference)
8988 error ("cannot declare reference to %q#T, which is not "
8989 "a typedef or a template type argument", type);
8991 else if (TREE_CODE (type) == METHOD_TYPE)
8992 type = build_ptrmemfunc_type (build_pointer_type (type));
8993 else if (declarator->kind == cdk_ptrmem)
8995 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8997 if (declarator->u.pointer.class_type == error_mark_node)
8998 /* We will already have complained. */
8999 type = error_mark_node;
9001 type = build_ptrmem_type (declarator->u.pointer.class_type,
9005 type = build_pointer_type (type);
9007 /* Process a list of type modifier keywords (such as
9008 const or volatile) that were given inside the `*' or `&'. */
9010 if (declarator->u.pointer.qualifiers)
9013 = cp_build_qualified_type (type,
9014 declarator->u.pointer.qualifiers);
9015 type_quals = cp_type_quals (type);
9028 /* A `constexpr' specifier used in an object declaration declares
9029 the object as `const'. */
9030 if (constexpr_p && innermost_code != cdk_function)
9032 if (type_quals & TYPE_QUAL_CONST)
9033 error ("both %<const%> and %<constexpr%> cannot be used here");
9034 if (type_quals & TYPE_QUAL_VOLATILE)
9035 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9036 type_quals |= TYPE_QUAL_CONST;
9037 type = cp_build_qualified_type (type, type_quals);
9040 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9041 && TREE_CODE (type) != FUNCTION_TYPE
9042 && TREE_CODE (type) != METHOD_TYPE)
9044 error ("template-id %qD used as a declarator",
9046 unqualified_id = dname;
9049 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9050 qualified with a class-name, turn it into a METHOD_TYPE, unless
9051 we know that the function is static. We take advantage of this
9052 opportunity to do other processing that pertains to entities
9053 explicitly declared to be class members. Note that if DECLARATOR
9054 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9055 would not have exited the loop above. */
9057 && declarator->u.id.qualifying_scope
9058 && TYPE_P (declarator->u.id.qualifying_scope))
9062 ctype = declarator->u.id.qualifying_scope;
9063 ctype = TYPE_MAIN_VARIANT (ctype);
9065 while (t != NULL_TREE && CLASS_TYPE_P (t))
9067 /* You're supposed to have one `template <...>' for every
9068 template class, but you don't need one for a full
9069 specialization. For example:
9071 template <class T> struct S{};
9072 template <> struct S<int> { void f(); };
9073 void S<int>::f () {}
9075 is correct; there shouldn't be a `template <>' for the
9076 definition of `S<int>::f'. */
9077 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9078 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9079 /* T is an explicit (not partial) specialization. All
9080 containing classes must therefore also be explicitly
9083 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9084 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9085 template_count += 1;
9087 t = TYPE_MAIN_DECL (t);
9088 t = DECL_CONTEXT (t);
9091 if (ctype == current_class_type)
9095 permerror (input_location, "member functions are implicitly friends of their class");
9099 permerror (declarator->id_loc,
9100 "extra qualification %<%T::%> on member %qs",
9103 else if (/* If the qualifying type is already complete, then we
9104 can skip the following checks. */
9105 !COMPLETE_TYPE_P (ctype)
9106 && (/* If the function is being defined, then
9107 qualifying type must certainly be complete. */
9109 /* A friend declaration of "T::f" is OK, even if
9110 "T" is a template parameter. But, if this
9111 function is not a friend, the qualifying type
9113 || (!friendp && !CLASS_TYPE_P (ctype))
9114 /* For a declaration, the type need not be
9115 complete, if either it is dependent (since there
9116 is no meaningful definition of complete in that
9117 case) or the qualifying class is currently being
9119 || !(dependent_type_p (ctype)
9120 || currently_open_class (ctype)))
9121 /* Check that the qualifying type is complete. */
9122 && !complete_type_or_else (ctype, NULL_TREE))
9123 return error_mark_node;
9124 else if (TREE_CODE (type) == FUNCTION_TYPE)
9126 if (current_class_type
9127 && (!friendp || funcdef_flag))
9130 ? "cannot define member function %<%T::%s%> within %<%T%>"
9131 : "cannot declare member function %<%T::%s%> within %<%T%>",
9132 ctype, name, current_class_type);
9133 return error_mark_node;
9136 else if (declspecs->specs[(int)ds_typedef]
9137 && current_class_type)
9139 error ("cannot declare member %<%T::%s%> within %qT",
9140 ctype, name, current_class_type);
9141 return error_mark_node;
9145 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9146 ctype = current_class_type;
9148 /* A constexpr non-static member function is implicitly const. */
9149 if (constexpr_p && ctype && staticp == 0
9150 && TREE_CODE (type) == FUNCTION_TYPE
9151 && sfk != sfk_constructor && sfk != sfk_destructor)
9152 memfn_quals |= TYPE_QUAL_CONST;
9154 /* Now TYPE has the actual type. */
9159 *attrlist = chainon (returned_attrs, *attrlist);
9161 attrlist = &returned_attrs;
9164 /* Handle parameter packs. */
9165 if (parameter_pack_p)
9167 if (decl_context == PARM)
9168 /* Turn the type into a pack expansion.*/
9169 type = make_pack_expansion (type);
9171 error ("non-parameter %qs cannot be a parameter pack", name);
9174 /* Did array size calculations overflow? */
9176 if (TREE_CODE (type) == ARRAY_TYPE
9177 && COMPLETE_TYPE_P (type)
9178 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9179 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9181 error ("size of array %qs is too large", name);
9182 /* If we proceed with the array type as it is, we'll eventually
9183 crash in tree_low_cst(). */
9184 type = error_mark_node;
9187 if ((decl_context == FIELD || decl_context == PARM)
9188 && !processing_template_decl
9189 && variably_modified_type_p (type, NULL_TREE))
9191 if (decl_context == FIELD)
9192 error ("data member may not have variably modified type %qT", type);
9194 error ("parameter may not have variably modified type %qT", type);
9195 type = error_mark_node;
9198 if (explicitp == 1 || (explicitp && friendp))
9200 /* [dcl.fct.spec] The explicit specifier shall only be used in
9201 declarations of constructors within a class definition. */
9202 error ("only declarations of constructors can be %<explicit%>");
9206 if (storage_class == sc_mutable)
9208 if (decl_context != FIELD || friendp)
9210 error ("non-member %qs cannot be declared %<mutable%>", name);
9211 storage_class = sc_none;
9213 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9215 error ("non-object member %qs cannot be declared %<mutable%>", name);
9216 storage_class = sc_none;
9218 else if (TREE_CODE (type) == FUNCTION_TYPE
9219 || TREE_CODE (type) == METHOD_TYPE)
9221 error ("function %qs cannot be declared %<mutable%>", name);
9222 storage_class = sc_none;
9226 error ("static %qs cannot be declared %<mutable%>", name);
9227 storage_class = sc_none;
9229 else if (type_quals & TYPE_QUAL_CONST)
9231 error ("const %qs cannot be declared %<mutable%>", name);
9232 storage_class = sc_none;
9234 else if (TREE_CODE (type) == REFERENCE_TYPE)
9236 permerror (input_location, "reference %qs cannot be declared "
9237 "%<mutable%>", name);
9238 storage_class = sc_none;
9242 /* If this is declaring a typedef name, return a TYPE_DECL. */
9243 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9247 /* Note that the grammar rejects storage classes
9248 in typenames, fields or parameters. */
9249 if (current_lang_name == lang_name_java)
9250 TYPE_FOR_JAVA (type) = 1;
9252 /* This declaration:
9254 typedef void f(int) const;
9256 declares a function type which is not a member of any
9257 particular class, but which is cv-qualified; for
9258 example "f S::*" declares a pointer to a const-qualified
9259 member function of S. We record the cv-qualification in the
9261 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9263 type = apply_memfn_quals (type, memfn_quals);
9265 /* We have now dealt with these qualifiers. */
9266 memfn_quals = TYPE_UNQUALIFIED;
9269 if (decl_context == FIELD)
9270 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9272 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9273 if (id_declarator && declarator->u.id.qualifying_scope) {
9274 error_at (DECL_SOURCE_LOCATION (decl),
9275 "typedef name may not be a nested-name-specifier");
9276 TREE_TYPE (decl) = error_mark_node;
9279 if (decl_context != FIELD)
9281 if (!current_function_decl)
9282 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9283 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9284 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9285 (current_function_decl)))
9286 /* The TYPE_DECL is "abstract" because there will be
9287 clones of this constructor/destructor, and there will
9288 be copies of this TYPE_DECL generated in those
9290 DECL_ABSTRACT (decl) = 1;
9292 else if (constructor_name_p (unqualified_id, current_class_type))
9293 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9294 "as enclosing class",
9297 /* If the user declares "typedef struct {...} foo" then the
9298 struct will have an anonymous name. Fill that name in now.
9299 Nothing can refer to it, so nothing needs know about the name
9301 if (type != error_mark_node
9304 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9305 && TYPE_ANONYMOUS_P (type)
9306 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9310 /* Replace the anonymous name with the real name everywhere. */
9311 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9313 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9314 /* We do not rename the debug info representing the
9315 anonymous tagged type because the standard says in
9316 [dcl.typedef] that the naming applies only for
9317 linkage purposes. */
9318 /*debug_hooks->set_name (t, decl);*/
9319 TYPE_NAME (t) = decl;
9322 if (TYPE_LANG_SPECIFIC (type))
9323 TYPE_WAS_ANONYMOUS (type) = 1;
9325 /* If this is a typedef within a template class, the nested
9326 type is a (non-primary) template. The name for the
9327 template needs updating as well. */
9328 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9329 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9330 = TYPE_IDENTIFIER (type);
9332 /* Adjust linkage now that we aren't anonymous anymore. */
9333 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9334 determine_visibility (TYPE_MAIN_DECL (type));
9336 /* FIXME remangle member functions; member functions of a
9337 type with external linkage have external linkage. */
9341 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9342 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9344 bad_specifiers (decl, BSP_TYPE, virtualp,
9345 memfn_quals != TYPE_UNQUALIFIED,
9346 inlinep, friendp, raises != NULL_TREE);
9351 /* Detect the case of an array type of unspecified size
9352 which came, as such, direct from a typedef name.
9353 We must copy the type, so that the array's domain can be
9354 individually set by the object's initializer. */
9356 if (type && typedef_type
9357 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9358 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9359 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9361 /* Detect where we're using a typedef of function type to declare a
9362 function. PARMS will not be set, so we must create it now. */
9364 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9366 tree decls = NULL_TREE;
9369 for (args = TYPE_ARG_TYPES (type);
9370 args && args != void_list_node;
9371 args = TREE_CHAIN (args))
9373 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9375 DECL_CHAIN (decl) = decls;
9379 parms = nreverse (decls);
9381 if (decl_context != TYPENAME)
9383 /* A cv-qualifier-seq shall only be part of the function type
9384 for a non-static member function. [8.3.5/4 dcl.fct] */
9385 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9386 && (current_class_type == NULL_TREE || staticp) )
9389 ? G_("qualified function types cannot be used to "
9390 "declare static member functions")
9391 : G_("qualified function types cannot be used to "
9392 "declare free functions"));
9393 type = TYPE_MAIN_VARIANT (type);
9396 /* The qualifiers on the function type become the qualifiers on
9397 the non-static member function. */
9398 memfn_quals |= type_memfn_quals (type);
9399 type_quals = TYPE_UNQUALIFIED;
9403 /* If this is a type name (such as, in a cast or sizeof),
9404 compute the type and return it now. */
9406 if (decl_context == TYPENAME)
9408 /* Note that the grammar rejects storage classes
9409 in typenames, fields or parameters. */
9410 if (type_quals != TYPE_UNQUALIFIED)
9411 type_quals = TYPE_UNQUALIFIED;
9413 /* Special case: "friend class foo" looks like a TYPENAME context. */
9416 if (type_quals != TYPE_UNQUALIFIED)
9418 error ("type qualifiers specified for friend class declaration");
9419 type_quals = TYPE_UNQUALIFIED;
9423 error ("%<inline%> specified for friend class declaration");
9429 /* Don't allow friend declaration without a class-key. */
9430 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9431 permerror (input_location, "template parameters cannot be friends");
9432 else if (TREE_CODE (type) == TYPENAME_TYPE)
9433 permerror (input_location, "friend declaration requires class-key, "
9434 "i.e. %<friend class %T::%D%>",
9435 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9437 permerror (input_location, "friend declaration requires class-key, "
9438 "i.e. %<friend %#T%>",
9442 /* Only try to do this stuff if we didn't already give up. */
9443 if (type != integer_type_node)
9445 /* A friendly class? */
9446 if (current_class_type)
9447 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9450 error ("trying to make class %qT a friend of global scope",
9453 type = void_type_node;
9456 else if (memfn_quals)
9458 if (ctype == NULL_TREE
9459 && TREE_CODE (type) == METHOD_TYPE)
9460 ctype = TYPE_METHOD_BASETYPE (type);
9463 type = build_memfn_type (type, ctype, memfn_quals);
9464 /* Core issue #547: need to allow this in template type args. */
9465 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9466 type = apply_memfn_quals (type, memfn_quals);
9468 error ("invalid qualifiers on non-member function type");
9473 else if (unqualified_id == NULL_TREE && decl_context != PARM
9474 && decl_context != CATCHPARM
9475 && TREE_CODE (type) != UNION_TYPE
9478 error ("abstract declarator %qT used as declaration", type);
9479 return error_mark_node;
9482 /* Only functions may be declared using an operator-function-id. */
9484 && IDENTIFIER_OPNAME_P (unqualified_id)
9485 && TREE_CODE (type) != FUNCTION_TYPE
9486 && TREE_CODE (type) != METHOD_TYPE)
9488 error ("declaration of %qD as non-function", unqualified_id);
9489 return error_mark_node;
9492 /* We don't check parameter types here because we can emit a better
9493 error message later. */
9494 if (decl_context != PARM)
9496 type = check_var_type (unqualified_id, type);
9497 if (type == error_mark_node)
9498 return error_mark_node;
9501 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9502 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9504 if (decl_context == PARM || decl_context == CATCHPARM)
9506 if (ctype || in_namespace)
9507 error ("cannot use %<::%> in parameter declaration");
9509 /* A parameter declared as an array of T is really a pointer to T.
9510 One declared as a function is really a pointer to a function.
9511 One declared as a member is really a pointer to member. */
9513 if (TREE_CODE (type) == ARRAY_TYPE)
9515 /* Transfer const-ness of array into that of type pointed to. */
9516 type = build_pointer_type (TREE_TYPE (type));
9517 type_quals = TYPE_UNQUALIFIED;
9519 else if (TREE_CODE (type) == FUNCTION_TYPE)
9520 type = build_pointer_type (type);
9523 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9524 && !NEW_DELETE_OPNAME_P (unqualified_id))
9525 type = build_memfn_type (type, ctype, memfn_quals);
9530 if (decl_context == PARM)
9532 decl = cp_build_parm_decl (unqualified_id, type);
9534 bad_specifiers (decl, BSP_PARM, virtualp,
9535 memfn_quals != TYPE_UNQUALIFIED,
9536 inlinep, friendp, raises != NULL_TREE);
9538 else if (decl_context == FIELD)
9540 /* The C99 flexible array extension. */
9541 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9542 && TYPE_DOMAIN (type) == NULL_TREE)
9544 tree itype = compute_array_index_type (dname, integer_zero_node,
9545 tf_warning_or_error);
9546 type = build_cplus_array_type (TREE_TYPE (type), itype);
9549 if (type == error_mark_node)
9551 /* Happens when declaring arrays of sizes which
9552 are error_mark_node, for example. */
9555 else if (in_namespace && !friendp)
9557 /* Something like struct S { int N::j; }; */
9558 error ("invalid use of %<::%>");
9559 return error_mark_node;
9561 else if (TREE_CODE (type) == FUNCTION_TYPE
9562 || TREE_CODE (type) == METHOD_TYPE)
9565 tree function_context;
9569 /* This should never happen in pure C++ (the check
9570 could be an assert). It could happen in
9571 Objective-C++ if someone writes invalid code that
9572 uses a function declaration for an instance
9573 variable or property (instance variables and
9574 properties are parsed as FIELD_DECLs, but they are
9575 part of an Objective-C class, not a C++ class).
9576 That code is invalid and is caught by this
9580 error ("declaration of function %qD in invalid context",
9582 return error_mark_node;
9585 /* ``A union may [ ... ] not [ have ] virtual functions.''
9587 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9589 error ("function %qD declared virtual inside a union",
9591 return error_mark_node;
9594 if (NEW_DELETE_OPNAME_P (unqualified_id))
9598 error ("%qD cannot be declared virtual, since it "
9606 /* Check that the name used for a destructor makes sense. */
9607 if (sfk == sfk_destructor)
9609 tree uqname = id_declarator->u.id.unqualified_name;
9613 gcc_assert (friendp);
9614 error ("expected qualified name in friend declaration "
9615 "for destructor %qD", uqname);
9616 return error_mark_node;
9619 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9621 error ("declaration of %qD as member of %qT",
9623 return error_mark_node;
9627 error ("a destructor cannot be %<constexpr%>");
9628 return error_mark_node;
9631 else if (sfk == sfk_constructor && friendp && !ctype)
9633 error ("expected qualified name in friend declaration "
9634 "for constructor %qD",
9635 id_declarator->u.id.unqualified_name);
9636 return error_mark_node;
9639 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9640 function_context = (ctype != NULL_TREE) ?
9641 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9642 publicp = (! friendp || ! staticp)
9643 && function_context == NULL_TREE;
9644 decl = grokfndecl (ctype, type,
9645 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9646 ? unqualified_id : dname,
9649 virtualp, flags, memfn_quals, raises,
9650 friendp ? -1 : 0, friendp, publicp,
9651 inlinep | (2 * constexpr_p),
9653 funcdef_flag, template_count, in_namespace,
9654 attrlist, declarator->id_loc);
9655 if (decl == NULL_TREE)
9656 return error_mark_node;
9658 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9659 /* The decl and setting of decl_attr is also turned off. */
9660 decl = build_decl_attribute_variant (decl, decl_attr);
9663 /* [class.conv.ctor]
9665 A constructor declared without the function-specifier
9666 explicit that can be called with a single parameter
9667 specifies a conversion from the type of its first
9668 parameter to the type of its class. Such a constructor
9669 is called a converting constructor. */
9671 DECL_NONCONVERTING_P (decl) = 1;
9673 else if (!staticp && !dependent_type_p (type)
9674 && !COMPLETE_TYPE_P (complete_type (type))
9675 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9678 error ("field %qD has incomplete type", unqualified_id);
9680 error ("name %qT has incomplete type", type);
9682 /* If we're instantiating a template, tell them which
9683 instantiation made the field's type be incomplete. */
9684 if (current_class_type
9685 && TYPE_NAME (current_class_type)
9686 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9688 && declspecs->type == type)
9689 error (" in instantiation of template %qT",
9690 current_class_type);
9692 return error_mark_node;
9698 error ("%qE is neither function nor member function; "
9699 "cannot be declared friend", unqualified_id);
9707 /* Friends are treated specially. */
9708 if (ctype == current_class_type)
9709 ; /* We already issued a permerror. */
9710 else if (decl && DECL_NAME (decl))
9712 if (template_class_depth (current_class_type) == 0)
9714 decl = check_explicit_specialization
9715 (unqualified_id, decl, template_count,
9716 2 * funcdef_flag + 4);
9717 if (decl == error_mark_node)
9718 return error_mark_node;
9721 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9722 decl = do_friend (ctype, unqualified_id, decl,
9728 return error_mark_node;
9731 /* Structure field. It may not be a function, except for C++. */
9733 if (decl == NULL_TREE)
9739 /* An attempt is being made to initialize a non-static
9740 member. But, from [class.mem]:
9742 4 A member-declarator can contain a
9743 constant-initializer only if it declares a static
9744 member (_class.static_) of integral or enumeration
9745 type, see _class.static.data_.
9747 This used to be relatively common practice, but
9748 the rest of the compiler does not correctly
9749 handle the initialization unless the member is
9750 static so we make it static below. */
9751 if (cxx_dialect >= cxx0x)
9753 sorry ("non-static data member initializers");
9757 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9759 permerror (input_location, "making %qD static", unqualified_id);
9764 if (uses_template_parms (type))
9765 /* We'll check at instantiation time. */
9767 else if (constexpr_p)
9768 /* constexpr has the same requirements. */
9770 else if (check_static_variable_definition (unqualified_id,
9772 /* If we just return the declaration, crashes
9773 will sometimes occur. We therefore return
9774 void_type_node, as if this was a friend
9775 declaration, to cause callers to completely
9776 ignore this declaration. */
9777 return error_mark_node;
9782 /* C++ allows static class members. All other work
9783 for this is done by grokfield. */
9784 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9785 set_linkage_for_static_data_member (decl);
9786 /* Even if there is an in-class initialization, DECL
9787 is considered undefined until an out-of-class
9788 definition is provided. */
9789 DECL_EXTERNAL (decl) = 1;
9792 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9794 if (constexpr_p && !initialized)
9796 error ("constexpr static data member %qD must have an "
9797 "initializer", decl);
9798 constexpr_p = false;
9805 error ("non-static data member %qE declared %<constexpr%>",
9807 constexpr_p = false;
9809 decl = build_decl (input_location,
9810 FIELD_DECL, unqualified_id, type);
9811 DECL_NONADDRESSABLE_P (decl) = bitfield;
9812 if (bitfield && !unqualified_id)
9813 TREE_NO_WARNING (decl) = 1;
9815 if (storage_class == sc_mutable)
9817 DECL_MUTABLE_P (decl) = 1;
9818 storage_class = sc_none;
9822 bad_specifiers (decl, BSP_FIELD, virtualp,
9823 memfn_quals != TYPE_UNQUALIFIED,
9824 inlinep, friendp, raises != NULL_TREE);
9827 else if (TREE_CODE (type) == FUNCTION_TYPE
9828 || TREE_CODE (type) == METHOD_TYPE)
9833 if (!unqualified_id)
9834 return error_mark_node;
9836 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9837 original_name = dname;
9839 original_name = unqualified_id;
9841 if (storage_class == sc_auto)
9842 error ("storage class %<auto%> invalid for function %qs", name);
9843 else if (storage_class == sc_register)
9844 error ("storage class %<register%> invalid for function %qs", name);
9846 error ("storage class %<__thread%> invalid for function %qs", name);
9848 /* Function declaration not at top level.
9849 Storage classes other than `extern' are not allowed
9850 and `extern' makes no difference. */
9851 if (! toplevel_bindings_p ()
9852 && (storage_class == sc_static
9853 || declspecs->specs[(int)ds_inline])
9856 if (storage_class == sc_static)
9857 pedwarn (input_location, OPT_pedantic,
9858 "%<static%> specified invalid for function %qs "
9859 "declared out of global scope", name);
9861 pedwarn (input_location, OPT_pedantic,
9862 "%<inline%> specifier invalid for function %qs "
9863 "declared out of global scope", name);
9866 if (ctype != NULL_TREE
9867 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9869 error ("%q#T is not a class or a namespace", ctype);
9873 if (ctype == NULL_TREE)
9877 error ("virtual non-class function %qs", name);
9880 else if (sfk == sfk_constructor
9881 || sfk == sfk_destructor)
9884 ? "%qs defined in a non-class scope"
9885 : "%qs declared in a non-class scope", name);
9890 /* Record presence of `static'. */
9891 publicp = (ctype != NULL_TREE
9892 || storage_class == sc_extern
9893 || storage_class != sc_static);
9895 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9896 virtualp, flags, memfn_quals, raises,
9898 publicp, inlinep | (2 * constexpr_p), sfk,
9900 template_count, in_namespace, attrlist,
9901 declarator->id_loc);
9902 if (decl == NULL_TREE)
9903 return error_mark_node;
9907 int invalid_static = 0;
9909 /* Don't allow a static member function in a class, and forbid
9910 declaring main to be static. */
9911 if (TREE_CODE (type) == METHOD_TYPE)
9913 permerror (input_location, "cannot declare member function %qD to have "
9914 "static linkage", decl);
9917 else if (current_function_decl)
9919 /* FIXME need arm citation */
9920 error ("cannot declare static function inside another function");
9927 storage_class = sc_none;
9933 /* It's a variable. */
9935 /* An uninitialized decl with `extern' is a reference. */
9936 decl = grokvardecl (type, unqualified_id,
9939 (type_quals & TYPE_QUAL_CONST) != 0,
9940 ctype ? ctype : in_namespace);
9941 bad_specifiers (decl, BSP_VAR, virtualp,
9942 memfn_quals != TYPE_UNQUALIFIED,
9943 inlinep, friendp, raises != NULL_TREE);
9947 DECL_CONTEXT (decl) = ctype;
9950 permerror (input_location, "%<static%> may not be used when defining "
9951 "(as opposed to declaring) a static data member");
9953 storage_class = sc_none;
9955 if (storage_class == sc_register && TREE_STATIC (decl))
9957 error ("static member %qD declared %<register%>", decl);
9958 storage_class = sc_none;
9960 if (storage_class == sc_extern && pedantic)
9962 pedwarn (input_location, OPT_pedantic,
9963 "cannot explicitly declare member %q#D to have "
9964 "extern linkage", decl);
9965 storage_class = sc_none;
9968 else if (constexpr_p && DECL_EXTERNAL (decl))
9969 error ("declaration of constexpr variable %qD is not a definition",
9973 if (storage_class == sc_extern && initialized && !funcdef_flag)
9975 if (toplevel_bindings_p ())
9977 /* It's common practice (and completely valid) to have a const
9978 be initialized and declared extern. */
9979 if (!(type_quals & TYPE_QUAL_CONST))
9980 warning (0, "%qs initialized and declared %<extern%>", name);
9984 error ("%qs has both %<extern%> and initializer", name);
9985 return error_mark_node;
9989 /* Record `register' declaration for warnings on &
9990 and in case doing stupid register allocation. */
9992 if (storage_class == sc_register)
9993 DECL_REGISTER (decl) = 1;
9994 else if (storage_class == sc_extern)
9995 DECL_THIS_EXTERN (decl) = 1;
9996 else if (storage_class == sc_static)
9997 DECL_THIS_STATIC (decl) = 1;
9999 /* Don't forget constexprness. */
10001 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10003 /* Record constancy and volatility on the DECL itself . There's
10004 no need to do this when processing a template; we'll do this
10005 for the instantiated declaration based on the type of DECL. */
10006 if (!processing_template_decl)
10007 cp_apply_type_quals_to_decl (type_quals, decl);
10013 /* Subroutine of start_function. Ensure that each of the parameter
10014 types (as listed in PARMS) is complete, as is required for a
10015 function definition. */
10018 require_complete_types_for_parms (tree parms)
10020 for (; parms; parms = DECL_CHAIN (parms))
10022 if (dependent_type_p (TREE_TYPE (parms)))
10024 if (!VOID_TYPE_P (TREE_TYPE (parms))
10025 && complete_type_or_else (TREE_TYPE (parms), parms))
10027 relayout_decl (parms);
10028 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10031 /* grokparms or complete_type_or_else will have already issued
10033 TREE_TYPE (parms) = error_mark_node;
10037 /* Returns nonzero if T is a local variable. */
10040 local_variable_p (const_tree t)
10042 if ((TREE_CODE (t) == VAR_DECL
10043 /* A VAR_DECL with a context that is a _TYPE is a static data
10045 && !TYPE_P (CP_DECL_CONTEXT (t))
10046 /* Any other non-local variable must be at namespace scope. */
10047 && !DECL_NAMESPACE_SCOPE_P (t))
10048 || (TREE_CODE (t) == PARM_DECL))
10054 /* Like local_variable_p, but suitable for use as a tree-walking
10058 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10059 void *data ATTRIBUTE_UNUSED)
10061 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10063 else if (TYPE_P (*tp))
10064 *walk_subtrees = 0;
10070 /* Check that ARG, which is a default-argument expression for a
10071 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10072 something goes wrong. DECL may also be a _TYPE node, rather than a
10073 DECL, if there is no DECL available. */
10076 check_default_argument (tree decl, tree arg)
10081 if (TREE_CODE (arg) == DEFAULT_ARG)
10082 /* We get a DEFAULT_ARG when looking at an in-class declaration
10083 with a default argument. Ignore the argument for now; we'll
10084 deal with it after the class is complete. */
10093 decl_type = TREE_TYPE (decl);
10095 if (arg == error_mark_node
10096 || decl == error_mark_node
10097 || TREE_TYPE (arg) == error_mark_node
10098 || decl_type == error_mark_node)
10099 /* Something already went wrong. There's no need to check
10101 return error_mark_node;
10103 /* [dcl.fct.default]
10105 A default argument expression is implicitly converted to the
10107 if (!TREE_TYPE (arg)
10108 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10111 error ("default argument for %q#D has type %qT",
10112 decl, TREE_TYPE (arg));
10114 error ("default argument for parameter of type %qT has type %qT",
10115 decl_type, TREE_TYPE (arg));
10117 return error_mark_node;
10120 /* [dcl.fct.default]
10122 Local variables shall not be used in default argument
10125 The keyword `this' shall not be used in a default argument of a
10126 member function. */
10127 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10130 error ("default argument %qE uses local variable %qD", arg, var);
10131 return error_mark_node;
10138 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10141 type_is_deprecated (tree type)
10143 enum tree_code code;
10144 if (TREE_DEPRECATED (type))
10146 if (TYPE_NAME (type)
10147 && TREE_DEPRECATED (TYPE_NAME (type)))
10150 /* Do warn about using typedefs to a deprecated class. */
10151 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10152 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10154 code = TREE_CODE (type);
10156 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10157 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10158 || code == METHOD_TYPE || code == ARRAY_TYPE)
10159 return type_is_deprecated (TREE_TYPE (type));
10161 if (TYPE_PTRMEMFUNC_P (type))
10162 return type_is_deprecated
10163 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10168 /* Decode the list of parameter types for a function type.
10169 Given the list of things declared inside the parens,
10170 return a list of types.
10172 If this parameter does not end with an ellipsis, we append
10175 *PARMS is set to the chain of PARM_DECLs created. */
10178 grokparms (tree parmlist, tree *parms)
10180 tree result = NULL_TREE;
10181 tree decls = NULL_TREE;
10185 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10187 tree type = NULL_TREE;
10188 tree init = TREE_PURPOSE (parm);
10189 tree decl = TREE_VALUE (parm);
10190 const char *errmsg;
10192 if (parm == void_list_node)
10195 if (! decl || TREE_TYPE (decl) == error_mark_node)
10198 type = TREE_TYPE (decl);
10199 if (VOID_TYPE_P (type))
10201 if (same_type_p (type, void_type_node)
10202 && DECL_SELF_REFERENCE_P (type)
10203 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10204 /* this is a parmlist of `(void)', which is ok. */
10206 cxx_incomplete_type_error (decl, type);
10207 /* It's not a good idea to actually create parameters of
10208 type `void'; other parts of the compiler assume that a
10209 void type terminates the parameter list. */
10210 type = error_mark_node;
10211 TREE_TYPE (decl) = error_mark_node;
10214 if (type != error_mark_node
10215 && TYPE_FOR_JAVA (type)
10216 && MAYBE_CLASS_TYPE_P (type))
10218 error ("parameter %qD has Java class type", decl);
10219 type = error_mark_node;
10220 TREE_TYPE (decl) = error_mark_node;
10224 if (type != error_mark_node
10225 && (errmsg = targetm.invalid_parameter_type (type)))
10228 type = error_mark_node;
10229 TREE_TYPE (decl) = error_mark_node;
10232 if (type != error_mark_node)
10234 if (deprecated_state != DEPRECATED_SUPPRESS)
10236 tree deptype = type_is_deprecated (type);
10238 warn_deprecated_use (deptype, NULL_TREE);
10241 /* Top-level qualifiers on the parameters are
10242 ignored for function types. */
10243 type = cp_build_qualified_type (type, 0);
10244 if (TREE_CODE (type) == METHOD_TYPE)
10246 error ("parameter %qD invalidly declared method type", decl);
10247 type = build_pointer_type (type);
10248 TREE_TYPE (decl) = type;
10250 else if (abstract_virtuals_error (decl, type))
10251 any_error = 1; /* Seems like a good idea. */
10252 else if (POINTER_TYPE_P (type))
10254 /* [dcl.fct]/6, parameter types cannot contain pointers
10255 (references) to arrays of unknown bound. */
10256 tree t = TREE_TYPE (type);
10257 int ptr = TYPE_PTR_P (type);
10261 if (TYPE_PTR_P (t))
10263 else if (TREE_CODE (t) != ARRAY_TYPE)
10265 else if (!TYPE_DOMAIN (t))
10269 if (TREE_CODE (t) == ARRAY_TYPE)
10271 ? G_("parameter %qD includes pointer to array of "
10272 "unknown bound %qT")
10273 : G_("parameter %qD includes reference to array of "
10274 "unknown bound %qT"),
10280 else if (init && !processing_template_decl)
10281 init = check_default_argument (decl, init);
10284 if (TREE_CODE (decl) == PARM_DECL
10285 && FUNCTION_PARAMETER_PACK_P (decl)
10286 && TREE_CHAIN (parm)
10287 && TREE_CHAIN (parm) != void_list_node)
10288 error ("parameter packs must be at the end of the parameter list");
10290 DECL_CHAIN (decl) = decls;
10292 result = tree_cons (init, type, result);
10294 decls = nreverse (decls);
10295 result = nreverse (result);
10297 result = chainon (result, void_list_node);
10304 /* D is a constructor or overloaded `operator='.
10306 Let T be the class in which D is declared. Then, this function
10309 -1 if D's is an ill-formed constructor or copy assignment operator
10310 whose first parameter is of type `T'.
10311 0 if D is not a copy constructor or copy assignment
10313 1 if D is a copy constructor or copy assignment operator whose
10314 first parameter is a reference to non-const qualified T.
10315 2 if D is a copy constructor or copy assignment operator whose
10316 first parameter is a reference to const qualified T.
10318 This function can be used as a predicate. Positive values indicate
10319 a copy constructor and nonzero values indicate a copy assignment
10323 copy_fn_p (const_tree d)
10329 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10331 if (TREE_CODE (d) == TEMPLATE_DECL
10332 || (DECL_TEMPLATE_INFO (d)
10333 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10334 /* Instantiations of template member functions are never copy
10335 functions. Note that member functions of templated classes are
10336 represented as template functions internally, and we must
10337 accept those as copy functions. */
10340 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10344 arg_type = TREE_VALUE (args);
10345 if (arg_type == error_mark_node)
10348 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10350 /* Pass by value copy assignment operator. */
10353 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10354 && !TYPE_REF_IS_RVALUE (arg_type)
10355 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10357 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10363 args = TREE_CHAIN (args);
10365 if (args && args != void_list_node && !TREE_PURPOSE (args))
10366 /* There are more non-optional args. */
10372 /* D is a constructor or overloaded `operator='.
10374 Let T be the class in which D is declared. Then, this function
10375 returns true when D is a move constructor or move assignment
10376 operator, false otherwise. */
10379 move_fn_p (const_tree d)
10383 bool result = false;
10385 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10387 if (cxx_dialect == cxx98)
10388 /* There are no move constructors if we are in C++98 mode. */
10391 if (TREE_CODE (d) == TEMPLATE_DECL
10392 || (DECL_TEMPLATE_INFO (d)
10393 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10394 /* Instantiations of template member functions are never copy
10395 functions. Note that member functions of templated classes are
10396 represented as template functions internally, and we must
10397 accept those as copy functions. */
10400 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10404 arg_type = TREE_VALUE (args);
10405 if (arg_type == error_mark_node)
10408 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10409 && TYPE_REF_IS_RVALUE (arg_type)
10410 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10414 args = TREE_CHAIN (args);
10416 if (args && args != void_list_node && !TREE_PURPOSE (args))
10417 /* There are more non-optional args. */
10423 /* Remember any special properties of member function DECL. */
10426 grok_special_member_properties (tree decl)
10430 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10433 class_type = DECL_CONTEXT (decl);
10434 if (DECL_CONSTRUCTOR_P (decl))
10436 int ctor = copy_fn_p (decl);
10438 if (!DECL_ARTIFICIAL (decl))
10439 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10445 A non-template constructor for class X is a copy
10446 constructor if its first parameter is of type X&, const
10447 X&, volatile X& or const volatile X&, and either there
10448 are no other parameters or else all other parameters have
10449 default arguments. */
10450 TYPE_HAS_COPY_CTOR (class_type) = 1;
10451 if (user_provided_p (decl))
10452 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10454 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10456 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10458 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10459 if (user_provided_p (decl))
10460 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10462 else if (move_fn_p (decl) && user_provided_p (decl))
10463 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10464 else if (is_list_ctor (decl))
10465 TYPE_HAS_LIST_CTOR (class_type) = 1;
10467 if (DECL_DECLARED_CONSTEXPR_P (decl)
10468 && !copy_fn_p (decl) && !move_fn_p (decl))
10469 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10471 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10475 A non-template assignment operator for class X is a copy
10476 assignment operator if its parameter is of type X, X&, const
10477 X&, volatile X& or const volatile X&. */
10479 int assop = copy_fn_p (decl);
10483 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10484 if (user_provided_p (decl))
10485 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10487 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10489 else if (move_fn_p (decl) && user_provided_p (decl))
10490 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10492 /* Destructors are handled in check_methods. */
10495 /* Check a constructor DECL has the correct form. Complains
10496 if the class has a constructor of the form X(X). */
10499 grok_ctor_properties (const_tree ctype, const_tree decl)
10501 int ctor_parm = copy_fn_p (decl);
10507 A declaration of a constructor for a class X is ill-formed if
10508 its first parameter is of type (optionally cv-qualified) X
10509 and either there are no other parameters or else all other
10510 parameters have default arguments.
10512 We *don't* complain about member template instantiations that
10513 have this form, though; they can occur as we try to decide
10514 what constructor to use during overload resolution. Since
10515 overload resolution will never prefer such a constructor to
10516 the non-template copy constructor (which is either explicitly
10517 or implicitly defined), there's no need to worry about their
10518 existence. Theoretically, they should never even be
10519 instantiated, but that's hard to forestall. */
10520 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10528 /* An operator with this code is unary, but can also be binary. */
10531 ambi_op_p (enum tree_code code)
10533 return (code == INDIRECT_REF
10534 || code == ADDR_EXPR
10535 || code == UNARY_PLUS_EXPR
10536 || code == NEGATE_EXPR
10537 || code == PREINCREMENT_EXPR
10538 || code == PREDECREMENT_EXPR);
10541 /* An operator with this name can only be unary. */
10544 unary_op_p (enum tree_code code)
10546 return (code == TRUTH_NOT_EXPR
10547 || code == BIT_NOT_EXPR
10548 || code == COMPONENT_REF
10549 || code == TYPE_EXPR);
10552 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10553 errors are issued for invalid declarations. */
10556 grok_op_properties (tree decl, bool complain)
10558 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10560 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10561 tree name = DECL_NAME (decl);
10562 enum tree_code operator_code;
10567 /* Count the number of arguments and check for ellipsis. */
10568 for (argtype = argtypes, arity = 0;
10569 argtype && argtype != void_list_node;
10570 argtype = TREE_CHAIN (argtype))
10572 ellipsis_p = !argtype;
10574 class_type = DECL_CONTEXT (decl);
10575 if (class_type && !CLASS_TYPE_P (class_type))
10576 class_type = NULL_TREE;
10578 if (DECL_CONV_FN_P (decl))
10579 operator_code = TYPE_EXPR;
10583 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10584 if (ansi_opname (CODE) == name) \
10586 operator_code = (CODE); \
10589 else if (ansi_assopname (CODE) == name) \
10591 operator_code = (CODE); \
10592 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10596 #include "operators.def"
10597 #undef DEF_OPERATOR
10599 gcc_unreachable ();
10602 gcc_assert (operator_code != MAX_TREE_CODES);
10603 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10606 switch (operator_code)
10609 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10613 TYPE_GETS_DELETE (class_type) |= 1;
10617 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10620 case VEC_DELETE_EXPR:
10621 TYPE_GETS_DELETE (class_type) |= 2;
10628 /* [basic.std.dynamic.allocation]/1:
10630 A program is ill-formed if an allocation function is declared
10631 in a namespace scope other than global scope or declared static
10634 The same also holds true for deallocation functions. */
10635 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10636 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10638 if (DECL_NAMESPACE_SCOPE_P (decl))
10640 if (CP_DECL_CONTEXT (decl) != global_namespace)
10642 error ("%qD may not be declared within a namespace", decl);
10645 else if (!TREE_PUBLIC (decl))
10647 error ("%qD may not be declared as static", decl);
10653 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10655 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10656 DECL_IS_OPERATOR_NEW (decl) = 1;
10658 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10659 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10662 /* An operator function must either be a non-static member function
10663 or have at least one parameter of a class, a reference to a class,
10664 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10665 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10667 if (operator_code == TYPE_EXPR
10668 || operator_code == CALL_EXPR
10669 || operator_code == COMPONENT_REF
10670 || operator_code == ARRAY_REF
10671 || operator_code == NOP_EXPR)
10673 error ("%qD must be a nonstatic member function", decl);
10680 if (DECL_STATIC_FUNCTION_P (decl))
10682 error ("%qD must be either a non-static member "
10683 "function or a non-member function", decl);
10687 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10689 tree arg = non_reference (TREE_VALUE (p));
10690 if (arg == error_mark_node)
10693 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10694 because these checks are performed even on
10695 template functions. */
10696 if (MAYBE_CLASS_TYPE_P (arg)
10697 || TREE_CODE (arg) == ENUMERAL_TYPE)
10701 if (!p || p == void_list_node)
10704 error ("%qD must have an argument of class or "
10705 "enumerated type", decl);
10711 /* There are no restrictions on the arguments to an overloaded
10713 if (operator_code == CALL_EXPR)
10716 /* Warn about conversion operators that will never be used. */
10717 if (IDENTIFIER_TYPENAME_P (name)
10718 && ! DECL_TEMPLATE_INFO (decl)
10720 /* Warn only declaring the function; there is no need to
10721 warn again about out-of-class definitions. */
10722 && class_type == current_class_type)
10724 tree t = TREE_TYPE (name);
10725 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10728 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10730 if (TREE_CODE (t) == VOID_TYPE)
10731 warning (OPT_Wconversion,
10733 ? G_("conversion to a reference to void "
10734 "will never use a type conversion operator")
10735 : G_("conversion to void "
10736 "will never use a type conversion operator"));
10737 else if (class_type)
10739 if (t == class_type)
10740 warning (OPT_Wconversion,
10742 ? G_("conversion to a reference to the same type "
10743 "will never use a type conversion operator")
10744 : G_("conversion to the same type "
10745 "will never use a type conversion operator"));
10746 /* Don't force t to be complete here. */
10747 else if (MAYBE_CLASS_TYPE_P (t)
10748 && COMPLETE_TYPE_P (t)
10749 && DERIVED_FROM_P (t, class_type))
10750 warning (OPT_Wconversion,
10752 ? G_("conversion to a reference to a base class "
10753 "will never use a type conversion operator")
10754 : G_("conversion to a base class "
10755 "will never use a type conversion operator"));
10760 if (operator_code == COND_EXPR)
10763 error ("ISO C++ prohibits overloading operator ?:");
10766 else if (ellipsis_p)
10768 error ("%qD must not have variable number of arguments", decl);
10771 else if (ambi_op_p (operator_code))
10774 /* We pick the one-argument operator codes by default, so
10775 we don't have to change anything. */
10777 else if (arity == 2)
10779 /* If we thought this was a unary operator, we now know
10780 it to be a binary operator. */
10781 switch (operator_code)
10784 operator_code = MULT_EXPR;
10788 operator_code = BIT_AND_EXPR;
10791 case UNARY_PLUS_EXPR:
10792 operator_code = PLUS_EXPR;
10796 operator_code = MINUS_EXPR;
10799 case PREINCREMENT_EXPR:
10800 operator_code = POSTINCREMENT_EXPR;
10803 case PREDECREMENT_EXPR:
10804 operator_code = POSTDECREMENT_EXPR;
10808 gcc_unreachable ();
10811 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10813 if ((operator_code == POSTINCREMENT_EXPR
10814 || operator_code == POSTDECREMENT_EXPR)
10815 && ! processing_template_decl
10816 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10819 error ("postfix %qD must take %<int%> as its argument",
10822 error ("postfix %qD must take %<int%> as its second "
10830 error ("%qD must take either zero or one argument", decl);
10832 error ("%qD must take either one or two arguments", decl);
10836 /* More Effective C++ rule 6. */
10838 && (operator_code == POSTINCREMENT_EXPR
10839 || operator_code == POSTDECREMENT_EXPR
10840 || operator_code == PREINCREMENT_EXPR
10841 || operator_code == PREDECREMENT_EXPR))
10843 tree arg = TREE_VALUE (argtypes);
10844 tree ret = TREE_TYPE (TREE_TYPE (decl));
10845 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10846 arg = TREE_TYPE (arg);
10847 arg = TYPE_MAIN_VARIANT (arg);
10848 if (operator_code == PREINCREMENT_EXPR
10849 || operator_code == PREDECREMENT_EXPR)
10851 if (TREE_CODE (ret) != REFERENCE_TYPE
10852 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10854 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10855 build_reference_type (arg));
10859 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10860 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10864 else if (unary_op_p (operator_code))
10869 error ("%qD must take %<void%>", decl);
10871 error ("%qD must take exactly one argument", decl);
10875 else /* if (binary_op_p (operator_code)) */
10880 error ("%qD must take exactly one argument", decl);
10882 error ("%qD must take exactly two arguments", decl);
10886 /* More Effective C++ rule 7. */
10888 && (operator_code == TRUTH_ANDIF_EXPR
10889 || operator_code == TRUTH_ORIF_EXPR
10890 || operator_code == COMPOUND_EXPR))
10891 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10895 /* Effective C++ rule 23. */
10898 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10899 && (operator_code == PLUS_EXPR
10900 || operator_code == MINUS_EXPR
10901 || operator_code == TRUNC_DIV_EXPR
10902 || operator_code == MULT_EXPR
10903 || operator_code == TRUNC_MOD_EXPR)
10904 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10905 warning (OPT_Weffc__, "%qD should return by value", decl);
10907 /* [over.oper]/8 */
10908 for (; argtypes && argtypes != void_list_node;
10909 argtypes = TREE_CHAIN (argtypes))
10910 if (TREE_PURPOSE (argtypes))
10912 TREE_PURPOSE (argtypes) = NULL_TREE;
10913 if (operator_code == POSTINCREMENT_EXPR
10914 || operator_code == POSTDECREMENT_EXPR)
10916 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10921 error ("%qD cannot have default arguments", decl);
10929 /* Return a string giving the keyword associate with CODE. */
10931 static const char *
10932 tag_name (enum tag_types code)
10944 case typename_type:
10947 gcc_unreachable ();
10951 /* Name lookup in an elaborated-type-specifier (after the keyword
10952 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10953 elaborated-type-specifier is invalid, issue a diagnostic and return
10954 error_mark_node; otherwise, return the *_TYPE to which it referred.
10955 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10958 check_elaborated_type_specifier (enum tag_types tag_code,
10960 bool allow_template_p)
10966 struct S { struct S *p; };
10968 name lookup will find the TYPE_DECL for the implicit "S::S"
10969 typedef. Adjust for that here. */
10970 if (DECL_SELF_REFERENCE_P (decl))
10971 decl = TYPE_NAME (TREE_TYPE (decl));
10973 type = TREE_TYPE (decl);
10975 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10976 is false for this case as well. */
10977 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10979 error ("using template type parameter %qT after %qs",
10980 type, tag_name (tag_code));
10981 return error_mark_node;
10985 If the identifier resolves to a typedef-name or a template
10986 type-parameter, the elaborated-type-specifier is ill-formed.
10988 In other words, the only legitimate declaration to use in the
10989 elaborated type specifier is the implicit typedef created when
10990 the type is declared. */
10991 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10992 && !DECL_SELF_REFERENCE_P (decl)
10993 && tag_code != typename_type)
10995 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10996 error ("%q+D has a previous declaration here", decl);
10997 return error_mark_node;
10999 else if (TREE_CODE (type) != RECORD_TYPE
11000 && TREE_CODE (type) != UNION_TYPE
11001 && tag_code != enum_type
11002 && tag_code != typename_type)
11004 error ("%qT referred to as %qs", type, tag_name (tag_code));
11005 error ("%q+T has a previous declaration here", type);
11006 return error_mark_node;
11008 else if (TREE_CODE (type) != ENUMERAL_TYPE
11009 && tag_code == enum_type)
11011 error ("%qT referred to as enum", type);
11012 error ("%q+T has a previous declaration here", type);
11013 return error_mark_node;
11015 else if (!allow_template_p
11016 && TREE_CODE (type) == RECORD_TYPE
11017 && CLASSTYPE_IS_TEMPLATE (type))
11019 /* If a class template appears as elaborated type specifier
11020 without a template header such as:
11022 template <class T> class C {};
11023 void f(class C); // No template header here
11025 then the required template argument is missing. */
11026 error ("template argument required for %<%s %T%>",
11027 tag_name (tag_code),
11028 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11029 return error_mark_node;
11035 /* Lookup NAME in elaborate type specifier in scope according to
11036 SCOPE and issue diagnostics if necessary.
11037 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11038 found, and ERROR_MARK_NODE for type error. */
11041 lookup_and_check_tag (enum tag_types tag_code, tree name,
11042 tag_scope scope, bool template_header_p)
11046 if (scope == ts_global)
11048 /* First try ordinary name lookup, ignoring hidden class name
11049 injected via friend declaration. */
11050 decl = lookup_name_prefer_type (name, 2);
11051 /* If that fails, the name will be placed in the smallest
11052 non-class, non-function-prototype scope according to 3.3.1/5.
11053 We may already have a hidden name declared as friend in this
11054 scope. So lookup again but not ignoring hidden names.
11055 If we find one, that name will be made visible rather than
11056 creating a new tag. */
11058 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11061 decl = lookup_type_scope (name, scope);
11063 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11064 decl = DECL_TEMPLATE_RESULT (decl);
11066 if (decl && TREE_CODE (decl) == TYPE_DECL)
11068 /* Look for invalid nested type:
11072 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11074 error ("%qD has the same name as the class in which it is "
11077 return error_mark_node;
11080 /* Two cases we need to consider when deciding if a class
11081 template is allowed as an elaborated type specifier:
11082 1. It is a self reference to its own class.
11083 2. It comes with a template header.
11087 template <class T> class C {
11088 class C *c1; // DECL_SELF_REFERENCE_P is true
11091 template <class U> class C; // template_header_p is true
11092 template <class T> class C<T>::D {
11093 class C *c2; // DECL_SELF_REFERENCE_P is true
11096 t = check_elaborated_type_specifier (tag_code,
11099 | DECL_SELF_REFERENCE_P (decl));
11102 else if (decl && TREE_CODE (decl) == TREE_LIST)
11104 error ("reference to %qD is ambiguous", name);
11105 print_candidates (decl);
11106 return error_mark_node;
11112 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11113 Define the tag as a forward-reference if it is not defined.
11115 If a declaration is given, process it here, and report an error if
11116 multiple declarations are not identical.
11118 SCOPE is TS_CURRENT when this is also a definition. Only look in
11119 the current frame for the name (since C++ allows new names in any
11120 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11121 declaration. Only look beginning from the current scope outward up
11122 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11124 TEMPLATE_HEADER_P is true when this declaration is preceded by
11125 a set of template parameters. */
11128 xref_tag (enum tag_types tag_code, tree name,
11129 tag_scope scope, bool template_header_p)
11131 enum tree_code code;
11133 tree context = NULL_TREE;
11135 timevar_push (TV_NAME_LOOKUP);
11137 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11143 code = RECORD_TYPE;
11149 code = ENUMERAL_TYPE;
11152 gcc_unreachable ();
11155 /* In case of anonymous name, xref_tag is only called to
11156 make type node and push name. Name lookup is not required. */
11157 if (ANON_AGGRNAME_P (name))
11160 t = lookup_and_check_tag (tag_code, name,
11161 scope, template_header_p);
11163 if (t == error_mark_node)
11164 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11166 if (scope != ts_current && t && current_class_type
11167 && template_class_depth (current_class_type)
11168 && template_header_p)
11170 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11171 definition of this tag. Since, in addition, we are currently
11172 processing a (member) template declaration of a template
11173 class, we must be very careful; consider:
11180 { template <class V>
11181 friend struct S1; };
11183 Here, the S2::S1 declaration should not be confused with the
11184 outer declaration. In particular, the inner version should
11185 have a template parameter of level 2, not level 1. This
11186 would be particularly important if the member declaration
11189 template <class V = U> friend struct S1;
11191 say, when we should tsubst into `U' when instantiating
11192 S2. On the other hand, when presented with:
11202 we must find the inner binding eventually. We
11203 accomplish this by making sure that the new type we
11204 create to represent this declaration has the right
11206 context = TYPE_CONTEXT (t);
11212 /* If no such tag is yet defined, create a forward-reference node
11213 and record it as the "definition".
11214 When a real declaration of this type is found,
11215 the forward-reference will be altered into a real type. */
11216 if (code == ENUMERAL_TYPE)
11218 error ("use of enum %q#D without previous declaration", name);
11219 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11223 t = make_class_type (code);
11224 TYPE_CONTEXT (t) = context;
11225 t = pushtag (name, t, scope);
11230 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11232 if (!redeclare_class_template (t, current_template_parms))
11233 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11235 else if (!processing_template_decl
11236 && CLASS_TYPE_P (t)
11237 && CLASSTYPE_IS_TEMPLATE (t))
11239 error ("redeclaration of %qT as a non-template", t);
11240 error ("previous declaration %q+D", t);
11241 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11244 /* Make injected friend class visible. */
11245 if (scope != ts_within_enclosing_non_class
11246 && hidden_name_p (TYPE_NAME (t)))
11248 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11249 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11251 if (TYPE_TEMPLATE_INFO (t))
11253 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11254 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11259 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11263 xref_tag_from_type (tree old, tree id, tag_scope scope)
11265 enum tag_types tag_kind;
11267 if (TREE_CODE (old) == RECORD_TYPE)
11268 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11270 tag_kind = union_type;
11272 if (id == NULL_TREE)
11273 id = TYPE_IDENTIFIER (old);
11275 return xref_tag (tag_kind, id, scope, false);
11278 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11279 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11280 access_* node, and the TREE_VALUE is the type of the base-class.
11281 Non-NULL TREE_TYPE indicates virtual inheritance.
11283 Returns true if the binfo hierarchy was successfully created,
11284 false if an error was detected. */
11287 xref_basetypes (tree ref, tree base_list)
11290 tree binfo, base_binfo;
11291 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11292 unsigned max_bases = 0; /* Maximum direct bases. */
11294 tree default_access;
11295 tree igo_prev; /* Track Inheritance Graph Order. */
11297 if (ref == error_mark_node)
11300 /* The base of a derived class is private by default, all others are
11302 default_access = (TREE_CODE (ref) == RECORD_TYPE
11303 && CLASSTYPE_DECLARED_CLASS (ref)
11304 ? access_private_node : access_public_node);
11306 /* First, make sure that any templates in base-classes are
11307 instantiated. This ensures that if we call ourselves recursively
11308 we do not get confused about which classes are marked and which
11310 basep = &base_list;
11313 tree basetype = TREE_VALUE (*basep);
11315 if (!(processing_template_decl && uses_template_parms (basetype))
11316 && !complete_type_or_else (basetype, NULL))
11317 /* An incomplete type. Remove it from the list. */
11318 *basep = TREE_CHAIN (*basep);
11322 if (TREE_TYPE (*basep))
11324 if (CLASS_TYPE_P (basetype))
11325 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11326 basep = &TREE_CHAIN (*basep);
11330 TYPE_MARKED_P (ref) = 1;
11332 /* The binfo slot should be empty, unless this is an (ill-formed)
11334 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11336 error ("redefinition of %q#T", ref);
11340 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11342 binfo = make_tree_binfo (max_bases);
11344 TYPE_BINFO (ref) = binfo;
11345 BINFO_OFFSET (binfo) = size_zero_node;
11346 BINFO_TYPE (binfo) = ref;
11348 /* Apply base-class info set up to the variants of this type. */
11349 fixup_type_variants (ref);
11353 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11354 /* An aggregate cannot have baseclasses. */
11355 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11357 if (TREE_CODE (ref) == UNION_TYPE)
11359 error ("derived union %qT invalid", ref);
11366 if (TYPE_FOR_JAVA (ref))
11368 error ("Java class %qT cannot have multiple bases", ref);
11375 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11377 if (TYPE_FOR_JAVA (ref))
11379 error ("Java class %qT cannot have virtual bases", ref);
11384 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11386 tree access = TREE_PURPOSE (base_list);
11387 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11388 tree basetype = TREE_VALUE (base_list);
11390 if (access == access_default_node)
11391 access = default_access;
11393 if (PACK_EXPANSION_P (basetype))
11394 basetype = PACK_EXPANSION_PATTERN (basetype);
11395 if (TREE_CODE (basetype) == TYPE_DECL)
11396 basetype = TREE_TYPE (basetype);
11397 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11399 error ("base type %qT fails to be a struct or class type",
11404 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11405 TYPE_FOR_JAVA (ref) = 1;
11407 base_binfo = NULL_TREE;
11408 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11410 base_binfo = TYPE_BINFO (basetype);
11411 /* The original basetype could have been a typedef'd type. */
11412 basetype = BINFO_TYPE (base_binfo);
11414 /* Inherit flags from the base. */
11415 TYPE_HAS_NEW_OPERATOR (ref)
11416 |= TYPE_HAS_NEW_OPERATOR (basetype);
11417 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11418 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11419 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11420 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11421 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11422 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11423 CLASSTYPE_REPEATED_BASE_P (ref)
11424 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11427 /* We must do this test after we've seen through a typedef
11429 if (TYPE_MARKED_P (basetype))
11431 if (basetype == ref)
11432 error ("recursive type %qT undefined", basetype);
11434 error ("duplicate base type %qT invalid", basetype);
11438 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11439 /* Regenerate the pack expansion for the bases. */
11440 basetype = make_pack_expansion (basetype);
11442 TYPE_MARKED_P (basetype) = 1;
11444 base_binfo = copy_binfo (base_binfo, basetype, ref,
11445 &igo_prev, via_virtual);
11446 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11447 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11449 BINFO_BASE_APPEND (binfo, base_binfo);
11450 BINFO_BASE_ACCESS_APPEND (binfo, access);
11453 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11454 /* If we have space in the vbase vector, we must have shared at
11455 least one of them, and are therefore diamond shaped. */
11456 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11458 /* Unmark all the types. */
11459 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11460 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11461 TYPE_MARKED_P (ref) = 0;
11463 /* Now see if we have a repeated base type. */
11464 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11466 for (base_binfo = binfo; base_binfo;
11467 base_binfo = TREE_CHAIN (base_binfo))
11469 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11471 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11474 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11476 for (base_binfo = binfo; base_binfo;
11477 base_binfo = TREE_CHAIN (base_binfo))
11478 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11479 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11488 /* Copies the enum-related properties from type SRC to type DST.
11489 Used with the underlying type of an enum and the enum itself. */
11491 copy_type_enum (tree dst, tree src)
11493 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11494 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11495 TYPE_SIZE (dst) = TYPE_SIZE (src);
11496 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11497 SET_TYPE_MODE (dst, TYPE_MODE (src));
11498 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11499 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11500 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11501 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11504 /* Begin compiling the definition of an enumeration type.
11507 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11509 UNDERLYING_TYPE is the type that will be used as the storage for
11510 the enumeration type. This should be NULL_TREE if no storage type
11513 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11515 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11517 Returns the type object, as yet incomplete.
11518 Also records info about it so that build_enumerator
11519 may be used to declare the individual values as they are read. */
11522 start_enum (tree name, tree enumtype, tree underlying_type,
11523 bool scoped_enum_p, bool *is_new)
11525 tree prevtype = NULL_TREE;
11526 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11530 /* [C++0x dcl.enum]p5:
11532 If not explicitly specified, the underlying type of a scoped
11533 enumeration type is int. */
11534 if (!underlying_type && scoped_enum_p)
11535 underlying_type = integer_type_node;
11537 if (underlying_type)
11538 underlying_type = cv_unqualified (underlying_type);
11540 /* If this is the real definition for a previous forward reference,
11541 fill in the contents in the same object that used to be the
11542 forward reference. */
11544 enumtype = lookup_and_check_tag (enum_type, name,
11545 /*tag_scope=*/ts_current,
11546 /*template_header_p=*/false);
11548 /* In case of a template_decl, the only check that should be deferred
11549 to instantiation time is the comparison of underlying types. */
11550 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11552 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11554 error_at (input_location, "scoped/unscoped mismatch "
11555 "in enum %q#T", enumtype);
11556 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11557 "previous definition here");
11558 enumtype = error_mark_node;
11560 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11562 error_at (input_location, "underlying type mismatch "
11563 "in enum %q#T", enumtype);
11564 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11565 "previous definition here");
11566 enumtype = error_mark_node;
11568 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11569 && !dependent_type_p (underlying_type)
11570 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11571 && !same_type_p (underlying_type,
11572 ENUM_UNDERLYING_TYPE (enumtype)))
11574 error_at (input_location, "different underlying type "
11575 "in enum %q#T", enumtype);
11576 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11577 "previous definition here");
11578 underlying_type = NULL_TREE;
11582 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11583 || processing_template_decl)
11585 /* In case of error, make a dummy enum to allow parsing to
11587 if (enumtype == error_mark_node)
11589 name = make_anon_name ();
11590 enumtype = NULL_TREE;
11593 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11594 of an opaque enum, or an opaque enum of an already defined
11595 enumeration (C++0x only).
11596 In any other case, it'll be NULL_TREE. */
11602 prevtype = enumtype;
11603 enumtype = cxx_make_type (ENUMERAL_TYPE);
11604 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11605 if (enumtype == error_mark_node)
11606 return error_mark_node;
11608 /* The enum is considered opaque until the opening '{' of the
11609 enumerator list. */
11610 SET_OPAQUE_ENUM_P (enumtype, true);
11611 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11614 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11616 if (underlying_type)
11618 if (CP_INTEGRAL_TYPE_P (underlying_type))
11620 copy_type_enum (enumtype, underlying_type);
11621 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11623 else if (dependent_type_p (underlying_type))
11624 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11626 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11627 underlying_type, enumtype);
11630 /* If into a template class, the returned enum is always the first
11631 declaration (opaque or not) seen. This way all the references to
11632 this type will be to the same declaration. The following ones are used
11633 only to check for definition errors. */
11634 if (prevtype && processing_template_decl)
11640 /* After processing and defining all the values of an enumeration type,
11641 install their decls in the enumeration type.
11642 ENUMTYPE is the type object. */
11645 finish_enum_value_list (tree enumtype)
11648 tree underlying_type;
11651 tree minnode, maxnode;
11654 bool fixed_underlying_type_p
11655 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11657 /* We built up the VALUES in reverse order. */
11658 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11660 /* For an enum defined in a template, just set the type of the values;
11661 all further processing is postponed until the template is
11662 instantiated. We need to set the type so that tsubst of a CONST_DECL
11664 if (processing_template_decl)
11666 for (values = TYPE_VALUES (enumtype);
11668 values = TREE_CHAIN (values))
11669 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11673 /* Determine the minimum and maximum values of the enumerators. */
11674 if (TYPE_VALUES (enumtype))
11676 minnode = maxnode = NULL_TREE;
11678 for (values = TYPE_VALUES (enumtype);
11680 values = TREE_CHAIN (values))
11682 decl = TREE_VALUE (values);
11684 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11685 each enumerator has the type of its enumeration. Prior to the
11686 closing brace, the type of each enumerator is the type of its
11687 initializing value. */
11688 TREE_TYPE (decl) = enumtype;
11690 /* Update the minimum and maximum values, if appropriate. */
11691 value = DECL_INITIAL (decl);
11692 if (value == error_mark_node)
11693 value = integer_zero_node;
11694 /* Figure out what the minimum and maximum values of the
11695 enumerators are. */
11697 minnode = maxnode = value;
11698 else if (tree_int_cst_lt (maxnode, value))
11700 else if (tree_int_cst_lt (value, minnode))
11707 If the enumerator-list is empty, the underlying type is as if
11708 the enumeration had a single enumerator with value 0. */
11709 minnode = maxnode = integer_zero_node;
11711 if (!fixed_underlying_type_p)
11713 /* Compute the number of bits require to represent all values of the
11714 enumeration. We must do this before the type of MINNODE and
11715 MAXNODE are transformed, since tree_int_cst_min_precision relies
11716 on the TREE_TYPE of the value it is passed. */
11717 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11718 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11719 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11720 int precision = MAX (lowprec, highprec);
11722 bool use_short_enum;
11724 /* Determine the underlying type of the enumeration.
11728 The underlying type of an enumeration is an integral type that
11729 can represent all the enumerator values defined in the
11730 enumeration. It is implementation-defined which integral type is
11731 used as the underlying type for an enumeration except that the
11732 underlying type shall not be larger than int unless the value of
11733 an enumerator cannot fit in an int or unsigned int.
11735 We use "int" or an "unsigned int" as the underlying type, even if
11736 a smaller integral type would work, unless the user has
11737 explicitly requested that we use the smallest possible type. The
11738 user can request that for all enumerations with a command line
11739 flag, or for just one enumeration with an attribute. */
11741 use_short_enum = flag_short_enums
11742 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11744 for (itk = (use_short_enum ? itk_char : itk_int);
11748 underlying_type = integer_types[itk];
11749 if (underlying_type != NULL_TREE
11750 && TYPE_PRECISION (underlying_type) >= precision
11751 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11754 if (itk == itk_none)
11758 IF no integral type can represent all the enumerator values, the
11759 enumeration is ill-formed. */
11760 error ("no integral type can represent all of the enumerator values "
11761 "for %qT", enumtype);
11762 precision = TYPE_PRECISION (long_long_integer_type_node);
11763 underlying_type = integer_types[itk_unsigned_long_long];
11768 The value of sizeof() applied to an enumeration type, an object
11769 of an enumeration type, or an enumerator, is the value of sizeof()
11770 applied to the underlying type. */
11771 copy_type_enum (enumtype, underlying_type);
11773 /* Compute the minimum and maximum values for the type.
11777 For an enumeration where emin is the smallest enumerator and emax
11778 is the largest, the values of the enumeration are the values of the
11779 underlying type in the range bmin to bmax, where bmin and bmax are,
11780 respectively, the smallest and largest values of the smallest bit-
11781 field that can store emin and emax. */
11783 /* The middle-end currently assumes that types with TYPE_PRECISION
11784 narrower than their underlying type are suitably zero or sign
11785 extended to fill their mode. Similarly, it assumes that the front
11786 end assures that a value of a particular type must be within
11787 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11789 We used to set these fields based on bmin and bmax, but that led
11790 to invalid assumptions like optimizing away bounds checking. So
11791 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11792 TYPE_MAX_VALUE to the values for the mode above and only restrict
11793 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11794 ENUM_UNDERLYING_TYPE (enumtype)
11795 = build_distinct_type_copy (underlying_type);
11796 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11797 set_min_and_max_values_for_integral_type
11798 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11800 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11801 if (flag_strict_enums)
11802 set_min_and_max_values_for_integral_type (enumtype, precision,
11806 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11808 /* Convert each of the enumerators to the type of the underlying
11809 type of the enumeration. */
11810 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11812 location_t saved_location;
11814 decl = TREE_VALUE (values);
11815 saved_location = input_location;
11816 input_location = DECL_SOURCE_LOCATION (decl);
11817 if (fixed_underlying_type_p)
11818 /* If the enumeration type has a fixed underlying type, we
11819 already checked all of the enumerator values. */
11820 value = DECL_INITIAL (decl);
11822 value = perform_implicit_conversion (underlying_type,
11823 DECL_INITIAL (decl),
11824 tf_warning_or_error);
11825 input_location = saved_location;
11827 /* Do not clobber shared ints. */
11828 value = copy_node (value);
11830 TREE_TYPE (value) = enumtype;
11831 DECL_INITIAL (decl) = value;
11834 /* Fix up all variant types of this enum type. */
11835 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11836 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11838 /* Finish debugging output for this type. */
11839 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11842 /* Finishes the enum type. This is called only the first time an
11843 enumeration is seen, be it opaque or odinary.
11844 ENUMTYPE is the type object. */
11847 finish_enum (tree enumtype)
11849 if (processing_template_decl)
11851 if (at_function_scope_p ())
11852 add_stmt (build_min (TAG_DEFN, enumtype));
11856 /* Here there should not be any variants of this type. */
11857 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11858 && !TYPE_NEXT_VARIANT (enumtype));
11861 /* Build and install a CONST_DECL for an enumeration constant of the
11862 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11863 LOC is the location of NAME.
11864 Assignment of sequential values by default is handled here. */
11867 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11873 /* If the VALUE was erroneous, pretend it wasn't there; that will
11874 result in the enum being assigned the next value in sequence. */
11875 if (value == error_mark_node)
11878 /* Remove no-op casts from the value. */
11880 STRIP_TYPE_NOPS (value);
11882 if (! processing_template_decl)
11884 /* Validate and default VALUE. */
11885 if (value != NULL_TREE)
11887 value = cxx_constant_value (value);
11889 if (TREE_CODE (value) == INTEGER_CST
11890 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
11892 value = perform_integral_promotions (value);
11896 error ("enumerator value for %qD is not an integer constant", name);
11901 /* Default based on previous value. */
11902 if (value == NULL_TREE)
11904 if (TYPE_VALUES (enumtype))
11907 unsigned HOST_WIDE_INT lo;
11911 /* The next value is the previous value plus one.
11912 add_double doesn't know the type of the target expression,
11913 so we must check with int_fits_type_p as well. */
11914 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11915 if (error_operand_p (prev_value))
11916 value = error_mark_node;
11919 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11920 TREE_INT_CST_HIGH (prev_value),
11922 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11924 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11928 error ("overflow in enumeration values at %qD", name);
11929 value = error_mark_node;
11934 value = integer_zero_node;
11937 /* Remove no-op casts from the value. */
11938 STRIP_TYPE_NOPS (value);
11940 /* If the underlying type of the enum is fixed, check whether
11941 the enumerator values fits in the underlying type. If it
11942 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11943 if (ENUM_UNDERLYING_TYPE (enumtype)
11945 && TREE_CODE (value) == INTEGER_CST
11946 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11948 error ("enumerator value %E is too large for underlying type %<%T%>",
11949 value, ENUM_UNDERLYING_TYPE (enumtype));
11951 /* Silently convert the value so that we can continue. */
11952 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11957 /* C++ associates enums with global, function, or class declarations. */
11958 context = current_scope ();
11960 /* Build the actual enumeration constant. Note that the enumeration
11961 constants have the underlying type of the enum (if it is fixed)
11962 or the type of their initializer (if the underlying type of the
11963 enum is not fixed):
11967 If the underlying type is fixed, the type of each enumerator
11968 prior to the closing brace is the underlying type; if the
11969 initializing value of an enumerator cannot be represented by
11970 the underlying type, the program is ill-formed. If the
11971 underlying type is not fixed, the type of each enumerator is
11972 the type of its initializing value.
11974 If the underlying type is not fixed, it will be computed by
11975 finish_enum and we will reset the type of this enumerator. Of
11976 course, if we're processing a template, there may be no value. */
11977 type = value ? TREE_TYPE (value) : NULL_TREE;
11979 if (context && context == current_class_type)
11980 /* This enum declaration is local to the class. We need the full
11981 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11982 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11984 /* It's a global enum, or it's local to a function. (Note local to
11985 a function could mean local to a class method. */
11986 decl = build_decl (loc, CONST_DECL, name, type);
11988 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11989 TREE_CONSTANT (decl) = 1;
11990 TREE_READONLY (decl) = 1;
11991 DECL_INITIAL (decl) = value;
11993 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11994 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11995 on the TYPE_FIELDS list for `S'. (That's so that you can say
11996 things like `S::i' later.) */
11997 finish_member_declaration (decl);
12001 /* Add this enumeration constant to the list for this type. */
12002 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12005 /* Look for an enumerator with the given NAME within the enumeration
12006 type ENUMTYPE. This routine is used primarily for qualified name
12007 lookup into an enumerator in C++0x, e.g.,
12009 enum class Color { Red, Green, Blue };
12011 Color color = Color::Red;
12013 Returns the value corresponding to the enumerator, or
12014 NULL_TREE if no such enumerator was found. */
12016 lookup_enumerator (tree enumtype, tree name)
12019 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12021 e = purpose_member (name, TYPE_VALUES (enumtype));
12022 return e? TREE_VALUE (e) : NULL_TREE;
12026 /* We're defining DECL. Make sure that its type is OK. */
12029 check_function_type (tree decl, tree current_function_parms)
12031 tree fntype = TREE_TYPE (decl);
12032 tree return_type = complete_type (TREE_TYPE (fntype));
12034 /* In a function definition, arg types must be complete. */
12035 require_complete_types_for_parms (current_function_parms);
12037 if (dependent_type_p (return_type))
12039 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12040 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12042 tree args = TYPE_ARG_TYPES (fntype);
12044 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12045 error ("return type %q#T is incomplete", return_type);
12047 error ("return type has Java class type %q#T", return_type);
12049 /* Make it return void instead. */
12050 if (TREE_CODE (fntype) == METHOD_TYPE)
12051 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12053 TREE_CHAIN (args));
12055 fntype = build_function_type (void_type_node, args);
12057 = build_exception_variant (fntype,
12058 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12059 fntype = (cp_build_type_attribute_variant
12060 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12061 TREE_TYPE (decl) = fntype;
12064 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12067 /* Create the FUNCTION_DECL for a function definition.
12068 DECLSPECS and DECLARATOR are the parts of the declaration;
12069 they describe the function's name and the type it returns,
12070 but twisted together in a fashion that parallels the syntax of C.
12072 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12073 DECLARATOR is really the DECL for the function we are about to
12074 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12075 indicating that the function is an inline defined in-class.
12077 This function creates a binding context for the function body
12078 as well as setting up the FUNCTION_DECL in current_function_decl.
12080 For C++, we must first check whether that datum makes any sense.
12081 For example, "class A local_a(1,2);" means that variable local_a
12082 is an aggregate of type A, which should have a constructor
12083 applied to it with the argument list [1, 2].
12085 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12086 or may be a BLOCK if the function has been defined previously
12087 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12088 error_mark_node if the function has never been defined, or
12089 a BLOCK if the function has been defined somewhere. */
12092 start_preparsed_function (tree decl1, tree attrs, int flags)
12094 tree ctype = NULL_TREE;
12097 int doing_friend = 0;
12098 struct cp_binding_level *bl;
12099 tree current_function_parms;
12100 struct c_fileinfo *finfo
12101 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12102 bool honor_interface;
12104 /* Sanity check. */
12105 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12106 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12108 fntype = TREE_TYPE (decl1);
12109 if (TREE_CODE (fntype) == METHOD_TYPE)
12110 ctype = TYPE_METHOD_BASETYPE (fntype);
12112 /* ISO C++ 11.4/5. A friend function defined in a class is in
12113 the (lexical) scope of the class in which it is defined. */
12114 if (!ctype && DECL_FRIEND_P (decl1))
12116 ctype = DECL_FRIEND_CONTEXT (decl1);
12118 /* CTYPE could be null here if we're dealing with a template;
12119 for example, `inline friend float foo()' inside a template
12120 will have no CTYPE set. */
12121 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12127 if (DECL_DECLARED_INLINE_P (decl1)
12128 && lookup_attribute ("noinline", attrs))
12129 warning (0, "inline function %q+D given attribute noinline", decl1);
12131 /* Handle gnu_inline attribute. */
12132 if (GNU_INLINE_P (decl1))
12134 DECL_EXTERNAL (decl1) = 1;
12135 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12136 DECL_INTERFACE_KNOWN (decl1) = 1;
12137 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12140 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12141 /* This is a constructor, we must ensure that any default args
12142 introduced by this definition are propagated to the clones
12143 now. The clones are used directly in overload resolution. */
12144 adjust_clone_args (decl1);
12146 /* Sometimes we don't notice that a function is a static member, and
12147 build a METHOD_TYPE for it. Fix that up now. */
12148 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12149 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12151 revert_static_member_fn (decl1);
12155 /* Set up current_class_type, and enter the scope of the class, if
12158 push_nested_class (ctype);
12159 else if (DECL_STATIC_FUNCTION_P (decl1))
12160 push_nested_class (DECL_CONTEXT (decl1));
12162 /* Now that we have entered the scope of the class, we must restore
12163 the bindings for any template parameters surrounding DECL1, if it
12164 is an inline member template. (Order is important; consider the
12165 case where a template parameter has the same name as a field of
12166 the class.) It is not until after this point that
12167 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12168 if (flags & SF_INCLASS_INLINE)
12169 maybe_begin_member_template_processing (decl1);
12171 /* Effective C++ rule 15. */
12173 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12174 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12175 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12177 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12178 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12179 if (!DECL_INITIAL (decl1))
12180 DECL_INITIAL (decl1) = error_mark_node;
12182 /* This function exists in static storage.
12183 (This does not mean `static' in the C sense!) */
12184 TREE_STATIC (decl1) = 1;
12186 /* We must call push_template_decl after current_class_type is set
12187 up. (If we are processing inline definitions after exiting a
12188 class scope, current_class_type will be NULL_TREE until set above
12189 by push_nested_class.) */
12190 if (processing_template_decl)
12192 /* FIXME: Handle error_mark_node more gracefully. */
12193 tree newdecl1 = push_template_decl (decl1);
12194 if (newdecl1 != error_mark_node)
12198 /* We are now in the scope of the function being defined. */
12199 current_function_decl = decl1;
12201 /* Save the parm names or decls from this function's declarator
12202 where store_parm_decls will find them. */
12203 current_function_parms = DECL_ARGUMENTS (decl1);
12205 /* Make sure the parameter and return types are reasonable. When
12206 you declare a function, these types can be incomplete, but they
12207 must be complete when you define the function. */
12208 check_function_type (decl1, current_function_parms);
12210 /* Build the return declaration for the function. */
12211 restype = TREE_TYPE (fntype);
12212 if (DECL_RESULT (decl1) == NULL_TREE)
12216 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12217 DECL_ARTIFICIAL (resdecl) = 1;
12218 DECL_IGNORED_P (resdecl) = 1;
12219 DECL_RESULT (decl1) = resdecl;
12221 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12224 /* Let the user know we're compiling this function. */
12225 announce_function (decl1);
12227 /* Record the decl so that the function name is defined.
12228 If we already have a decl for this name, and it is a FUNCTION_DECL,
12229 use the old decl. */
12230 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12232 /* A specialization is not used to guide overload resolution. */
12233 if (!DECL_FUNCTION_MEMBER_P (decl1)
12234 && !(DECL_USE_TEMPLATE (decl1) &&
12235 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12237 tree olddecl = pushdecl (decl1);
12239 if (olddecl == error_mark_node)
12240 /* If something went wrong when registering the declaration,
12241 use DECL1; we have to have a FUNCTION_DECL to use when
12242 parsing the body of the function. */
12246 /* Otherwise, OLDDECL is either a previous declaration
12247 of the same function or DECL1 itself. */
12249 if (warn_missing_declarations
12250 && olddecl == decl1
12251 && !DECL_MAIN_P (decl1)
12252 && TREE_PUBLIC (decl1)
12253 && !DECL_DECLARED_INLINE_P (decl1))
12257 /* Check whether DECL1 is in an anonymous
12259 for (context = DECL_CONTEXT (decl1);
12261 context = DECL_CONTEXT (context))
12263 if (TREE_CODE (context) == NAMESPACE_DECL
12264 && DECL_NAME (context) == NULL_TREE)
12268 if (context == NULL)
12269 warning (OPT_Wmissing_declarations,
12270 "no previous declaration for %q+D", decl1);
12278 /* We need to set the DECL_CONTEXT. */
12279 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12280 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12282 fntype = TREE_TYPE (decl1);
12284 /* If #pragma weak applies, mark the decl appropriately now.
12285 The pragma only applies to global functions. Because
12286 determining whether or not the #pragma applies involves
12287 computing the mangled name for the declaration, we cannot
12288 apply the pragma until after we have merged this declaration
12289 with any previous declarations; if the original declaration
12290 has a linkage specification, that specification applies to
12291 the definition as well, and may affect the mangled name. */
12292 if (DECL_FILE_SCOPE_P (decl1))
12293 maybe_apply_pragma_weak (decl1);
12296 /* constexpr functions must have literal argument types and
12297 literal return type. */
12298 validate_constexpr_fundecl (decl1);
12300 /* Reset this in case the call to pushdecl changed it. */
12301 current_function_decl = decl1;
12303 gcc_assert (DECL_INITIAL (decl1));
12305 /* This function may already have been parsed, in which case just
12306 return; our caller will skip over the body without parsing. */
12307 if (DECL_INITIAL (decl1) != error_mark_node)
12310 /* Initialize RTL machinery. We cannot do this until
12311 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12312 even when processing a template; this is how we get
12313 CFUN set up, and our per-function variables initialized.
12314 FIXME factor out the non-RTL stuff. */
12315 bl = current_binding_level;
12316 allocate_struct_function (decl1, processing_template_decl);
12318 /* Initialize the language data structures. Whenever we start
12319 a new function, we destroy temporaries in the usual way. */
12320 cfun->language = ggc_alloc_cleared_language_function ();
12321 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12322 current_binding_level = bl;
12324 /* Even though we're inside a function body, we still don't want to
12325 call expand_expr to calculate the size of a variable-sized array.
12326 We haven't necessarily assigned RTL to all variables yet, so it's
12327 not safe to try to expand expressions involving them. */
12328 cfun->dont_save_pending_sizes_p = 1;
12330 /* Start the statement-tree, start the tree now. */
12331 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12333 /* If we are (erroneously) defining a function that we have already
12334 defined before, wipe out what we knew before. */
12335 if (!DECL_PENDING_INLINE_P (decl1))
12336 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12338 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12340 /* We know that this was set up by `grokclassfn'. We do not
12341 wait until `store_parm_decls', since evil parse errors may
12342 never get us to that point. Here we keep the consistency
12343 between `current_class_type' and `current_class_ptr'. */
12344 tree t = DECL_ARGUMENTS (decl1);
12346 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12347 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12349 cp_function_chain->x_current_class_ref
12350 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12351 cp_function_chain->x_current_class_ptr = t;
12353 /* Constructors and destructors need to know whether they're "in
12354 charge" of initializing virtual base classes. */
12355 t = DECL_CHAIN (t);
12356 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12358 current_in_charge_parm = t;
12359 t = DECL_CHAIN (t);
12361 if (DECL_HAS_VTT_PARM_P (decl1))
12363 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12364 current_vtt_parm = t;
12368 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12369 /* Implicitly-defined methods (like the
12370 destructor for a class in which no destructor
12371 is explicitly declared) must not be defined
12372 until their definition is needed. So, we
12373 ignore interface specifications for
12374 compiler-generated functions. */
12375 && !DECL_ARTIFICIAL (decl1));
12377 if (DECL_INTERFACE_KNOWN (decl1))
12379 tree ctx = decl_function_context (decl1);
12381 if (DECL_NOT_REALLY_EXTERN (decl1))
12382 DECL_EXTERNAL (decl1) = 0;
12384 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12385 && TREE_PUBLIC (ctx))
12386 /* This is a function in a local class in an extern inline
12388 comdat_linkage (decl1);
12390 /* If this function belongs to an interface, it is public.
12391 If it belongs to someone else's interface, it is also external.
12392 This only affects inlines and template instantiations. */
12393 else if (!finfo->interface_unknown && honor_interface)
12395 if (DECL_DECLARED_INLINE_P (decl1)
12396 || DECL_TEMPLATE_INSTANTIATION (decl1)
12397 || processing_template_decl)
12399 DECL_EXTERNAL (decl1)
12400 = (finfo->interface_only
12401 || (DECL_DECLARED_INLINE_P (decl1)
12402 && ! flag_implement_inlines
12403 && !DECL_VINDEX (decl1)));
12405 /* For WIN32 we also want to put these in linkonce sections. */
12406 maybe_make_one_only (decl1);
12409 DECL_EXTERNAL (decl1) = 0;
12410 DECL_INTERFACE_KNOWN (decl1) = 1;
12411 /* If this function is in an interface implemented in this file,
12412 make sure that the back end knows to emit this function
12414 if (!DECL_EXTERNAL (decl1))
12415 mark_needed (decl1);
12417 else if (finfo->interface_unknown && finfo->interface_only
12418 && honor_interface)
12420 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12421 interface, we will have both finfo->interface_unknown and
12422 finfo->interface_only set. In that case, we don't want to
12423 use the normal heuristics because someone will supply a
12424 #pragma implementation elsewhere, and deducing it here would
12425 produce a conflict. */
12426 comdat_linkage (decl1);
12427 DECL_EXTERNAL (decl1) = 0;
12428 DECL_INTERFACE_KNOWN (decl1) = 1;
12429 DECL_DEFER_OUTPUT (decl1) = 1;
12433 /* This is a definition, not a reference.
12434 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12435 if (!GNU_INLINE_P (decl1))
12436 DECL_EXTERNAL (decl1) = 0;
12438 if ((DECL_DECLARED_INLINE_P (decl1)
12439 || DECL_TEMPLATE_INSTANTIATION (decl1))
12440 && ! DECL_INTERFACE_KNOWN (decl1))
12441 DECL_DEFER_OUTPUT (decl1) = 1;
12443 DECL_INTERFACE_KNOWN (decl1) = 1;
12446 /* Determine the ELF visibility attribute for the function. We must not
12447 do this before calling "pushdecl", as we must allow "duplicate_decls"
12448 to merge any attributes appropriately. We also need to wait until
12450 if (!DECL_CLONED_FUNCTION_P (decl1))
12451 determine_visibility (decl1);
12453 begin_scope (sk_function_parms, decl1);
12457 if (DECL_DESTRUCTOR_P (decl1)
12458 || (DECL_CONSTRUCTOR_P (decl1)
12459 && targetm.cxx.cdtor_returns_this ()))
12461 cdtor_label = build_decl (input_location,
12462 LABEL_DECL, NULL_TREE, NULL_TREE);
12463 DECL_CONTEXT (cdtor_label) = current_function_decl;
12466 start_fname_decls ();
12468 store_parm_decls (current_function_parms);
12472 /* Like start_preparsed_function, except that instead of a
12473 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12475 Returns 1 on success. If the DECLARATOR is not suitable for a function
12476 (it defines a datum instead), we return 0, which tells
12477 yyparse to report a parse error. */
12480 start_function (cp_decl_specifier_seq *declspecs,
12481 const cp_declarator *declarator,
12486 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12487 if (decl1 == error_mark_node)
12489 /* If the declarator is not suitable for a function definition,
12490 cause a syntax error. */
12491 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12493 error ("invalid function declaration");
12497 if (DECL_MAIN_P (decl1))
12498 /* main must return int. grokfndecl should have corrected it
12499 (and issued a diagnostic) if the user got it wrong. */
12500 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12501 integer_type_node));
12503 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12508 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12512 use_eh_spec_block (tree fn)
12514 return (flag_exceptions && flag_enforce_eh_specs
12515 && !processing_template_decl
12516 && !type_throw_all_p (TREE_TYPE (fn))
12517 /* We insert the EH_SPEC_BLOCK only in the original
12518 function; then, it is copied automatically to the
12520 && !DECL_CLONED_FUNCTION_P (fn)
12521 /* Implicitly-generated constructors and destructors have
12522 exception specifications. However, those specifications
12523 are the union of the possible exceptions specified by the
12524 constructors/destructors for bases and members, so no
12525 unallowed exception will ever reach this function. By
12526 not creating the EH_SPEC_BLOCK we save a little memory,
12527 and we avoid spurious warnings about unreachable
12529 && !DECL_ARTIFICIAL (fn));
12532 /* Store the parameter declarations into the current function declaration.
12533 This is called after parsing the parameter declarations, before
12534 digesting the body of the function.
12536 Also install to binding contour return value identifier, if any. */
12539 store_parm_decls (tree current_function_parms)
12541 tree fndecl = current_function_decl;
12544 /* This is a chain of any other decls that came in among the parm
12545 declarations. If a parm is declared with enum {foo, bar} x;
12546 then CONST_DECLs for foo and bar are put here. */
12547 tree nonparms = NULL_TREE;
12549 if (current_function_parms)
12551 /* This case is when the function was defined with an ANSI prototype.
12552 The parms already have decls, so we need not do anything here
12553 except record them as in effect
12554 and complain if any redundant old-style parm decls were written. */
12556 tree specparms = current_function_parms;
12559 /* Must clear this because it might contain TYPE_DECLs declared
12561 current_binding_level->names = NULL;
12563 /* If we're doing semantic analysis, then we'll call pushdecl
12564 for each of these. We must do them in reverse order so that
12565 they end in the correct forward order. */
12566 specparms = nreverse (specparms);
12568 for (parm = specparms; parm; parm = next)
12570 next = DECL_CHAIN (parm);
12571 if (TREE_CODE (parm) == PARM_DECL)
12573 if (DECL_NAME (parm) == NULL_TREE
12574 || TREE_CODE (parm) != VOID_TYPE)
12577 error ("parameter %qD declared void", parm);
12581 /* If we find an enum constant or a type tag,
12582 put it aside for the moment. */
12583 TREE_CHAIN (parm) = NULL_TREE;
12584 nonparms = chainon (nonparms, parm);
12588 /* Get the decls in their original chain order and record in the
12589 function. This is all and only the PARM_DECLs that were
12590 pushed into scope by the loop above. */
12591 DECL_ARGUMENTS (fndecl) = getdecls ();
12594 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12596 /* Now store the final chain of decls for the arguments
12597 as the decl-chain of the current lexical scope.
12598 Put the enumerators in as well, at the front so that
12599 DECL_ARGUMENTS is not modified. */
12600 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12602 if (use_eh_spec_block (current_function_decl))
12603 current_eh_spec_block = begin_eh_spec_block ();
12607 /* We have finished doing semantic analysis on DECL, but have not yet
12608 generated RTL for its body. Save away our current state, so that
12609 when we want to generate RTL later we know what to do. */
12612 save_function_data (tree decl)
12614 struct language_function *f;
12616 /* Save the language-specific per-function data so that we can
12617 get it back when we really expand this function. */
12618 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12621 f = ggc_alloc_language_function ();
12622 memcpy (f, cp_function_chain, sizeof (struct language_function));
12623 DECL_SAVED_FUNCTION_DATA (decl) = f;
12625 /* Clear out the bits we don't need. */
12626 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12627 f->bindings = NULL;
12628 f->x_local_names = NULL;
12632 /* Set the return value of the constructor (if present). */
12635 finish_constructor_body (void)
12640 if (targetm.cxx.cdtor_returns_this ()
12641 && (! TYPE_FOR_JAVA (current_class_type)))
12643 /* Any return from a constructor will end up here. */
12644 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12646 val = DECL_ARGUMENTS (current_function_decl);
12647 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12648 DECL_RESULT (current_function_decl), val);
12649 /* Return the address of the object. */
12650 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12651 add_stmt (exprstmt);
12655 /* Do all the processing for the beginning of a destructor; set up the
12656 vtable pointers and cleanups for bases and members. */
12659 begin_destructor_body (void)
12661 tree compound_stmt;
12663 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12664 issued an error message. We still want to try to process the
12665 body of the function, but initialize_vtbl_ptrs will crash if
12666 TYPE_BINFO is NULL. */
12667 if (COMPLETE_TYPE_P (current_class_type))
12669 compound_stmt = begin_compound_stmt (0);
12670 /* Make all virtual function table pointers in non-virtual base
12671 classes point to CURRENT_CLASS_TYPE's virtual function
12673 initialize_vtbl_ptrs (current_class_ptr);
12674 finish_compound_stmt (compound_stmt);
12676 /* And insert cleanups for our bases and members so that they
12677 will be properly destroyed if we throw. */
12678 push_base_cleanups ();
12682 /* At the end of every destructor we generate code to delete the object if
12683 necessary. Do that now. */
12686 finish_destructor_body (void)
12690 /* Any return from a destructor will end up here; that way all base
12691 and member cleanups will be run when the function returns. */
12692 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12694 /* In a virtual destructor, we must call delete. */
12695 if (DECL_VIRTUAL_P (current_function_decl))
12698 tree virtual_size = cxx_sizeof (current_class_type);
12702 At the point of definition of a virtual destructor (including
12703 an implicit definition), non-placement operator delete shall
12704 be looked up in the scope of the destructor's class and if
12705 found shall be accessible and unambiguous. */
12706 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12708 /*global_p=*/false,
12709 /*placement=*/NULL_TREE,
12710 /*alloc_fn=*/NULL_TREE);
12712 if_stmt = begin_if_stmt ();
12713 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12714 current_in_charge_parm,
12717 finish_expr_stmt (exprstmt);
12718 finish_then_clause (if_stmt);
12719 finish_if_stmt (if_stmt);
12722 if (targetm.cxx.cdtor_returns_this ())
12726 val = DECL_ARGUMENTS (current_function_decl);
12727 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12728 DECL_RESULT (current_function_decl), val);
12729 /* Return the address of the object. */
12730 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12731 add_stmt (exprstmt);
12735 /* Do the necessary processing for the beginning of a function body, which
12736 in this case includes member-initializers, but not the catch clauses of
12737 a function-try-block. Currently, this means opening a binding level
12738 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12741 begin_function_body (void)
12745 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12748 if (processing_template_decl)
12749 /* Do nothing now. */;
12751 /* Always keep the BLOCK node associated with the outermost pair of
12752 curly braces of a function. These are needed for correct
12753 operation of dwarfout.c. */
12754 keep_next_level (true);
12756 stmt = begin_compound_stmt (BCS_FN_BODY);
12758 if (processing_template_decl)
12759 /* Do nothing now. */;
12760 else if (DECL_DESTRUCTOR_P (current_function_decl))
12761 begin_destructor_body ();
12766 /* Do the processing for the end of a function body. Currently, this means
12767 closing out the cleanups for fully-constructed bases and members, and in
12768 the case of the destructor, deleting the object if desired. Again, this
12769 is only meaningful for [cd]tors, since they are the only functions where
12770 there is a significant distinction between the main body and any
12771 function catch clauses. Handling, say, main() return semantics here
12772 would be wrong, as flowing off the end of a function catch clause for
12773 main() would also need to return 0. */
12776 finish_function_body (tree compstmt)
12778 if (compstmt == NULL_TREE)
12781 /* Close the block. */
12782 finish_compound_stmt (compstmt);
12784 if (processing_template_decl)
12785 /* Do nothing now. */;
12786 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12787 finish_constructor_body ();
12788 else if (DECL_DESTRUCTOR_P (current_function_decl))
12789 finish_destructor_body ();
12792 /* Given a function, returns the BLOCK corresponding to the outermost level
12793 of curly braces, skipping the artificial block created for constructor
12797 outer_curly_brace_block (tree fndecl)
12799 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12800 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12801 /* Skip the artificial function body block. */
12802 block = BLOCK_SUBBLOCKS (block);
12806 /* If FNDECL is a class's key method, add the class to the list of
12807 keyed classes that should be emitted. */
12810 record_key_method_defined (tree fndecl)
12812 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12813 && DECL_VIRTUAL_P (fndecl)
12814 && !processing_template_decl)
12816 tree fnclass = DECL_CONTEXT (fndecl);
12817 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12818 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12822 /* Subroutine of finish_function.
12823 Save the body of constexpr functions for possible
12824 future compile time evaluation. */
12827 maybe_save_function_definition (tree fun)
12829 if (!processing_template_decl
12830 && DECL_DECLARED_CONSTEXPR_P (fun)
12831 && !DECL_CLONED_FUNCTION_P (fun))
12832 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12835 /* Finish up a function declaration and compile that function
12836 all the way to assembler language output. The free the storage
12837 for the function definition.
12839 FLAGS is a bitwise or of the following values:
12841 We just finished processing the body of an in-class inline
12842 function definition. (This processing will have taken place
12843 after the class definition is complete.) */
12846 finish_function (int flags)
12848 tree fndecl = current_function_decl;
12849 tree fntype, ctype = NULL_TREE;
12850 int inclass_inline = (flags & 2) != 0;
12852 /* When we get some parse errors, we can end up without a
12853 current_function_decl, so cope. */
12854 if (fndecl == NULL_TREE)
12855 return error_mark_node;
12857 if (c_dialect_objc ())
12858 objc_finish_function ();
12860 gcc_assert (!defer_mark_used_calls);
12861 defer_mark_used_calls = true;
12863 record_key_method_defined (fndecl);
12865 fntype = TREE_TYPE (fndecl);
12867 /* TREE_READONLY (fndecl) = 1;
12868 This caused &foo to be of type ptr-to-const-function
12869 which then got a warning when stored in a ptr-to-function variable. */
12871 gcc_assert (building_stmt_tree ());
12872 /* The current function is being defined, so its DECL_INITIAL should
12873 be set, and unless there's a multiple definition, it should be
12874 error_mark_node. */
12875 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12877 /* For a cloned function, we've already got all the code we need;
12878 there's no need to add any extra bits. */
12879 if (!DECL_CLONED_FUNCTION_P (fndecl))
12881 if (DECL_MAIN_P (current_function_decl))
12885 /* Make it so that `main' always returns 0 by default (or
12888 stmt = finish_return_stmt (integer_one_node);
12890 stmt = finish_return_stmt (integer_zero_node);
12892 /* Hack. We don't want the middle-end to warn that this
12893 return is unreachable, so put the statement on the
12896 location_t linezero = linemap_line_start (line_table, 0, 1);
12897 SET_EXPR_LOCATION (stmt, linezero);
12901 if (use_eh_spec_block (current_function_decl))
12902 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12903 (TREE_TYPE (current_function_decl)),
12904 current_eh_spec_block);
12907 /* If we're saving up tree structure, tie off the function now. */
12908 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12910 finish_fname_decls ();
12912 /* If this function can't throw any exceptions, remember that. */
12913 if (!processing_template_decl
12914 && !cp_function_chain->can_throw
12915 && !flag_non_call_exceptions
12916 && !decl_replaceable_p (fndecl))
12917 TREE_NOTHROW (fndecl) = 1;
12919 /* This must come after expand_function_end because cleanups might
12920 have declarations (from inline functions) that need to go into
12921 this function's blocks. */
12923 /* If the current binding level isn't the outermost binding level
12924 for this function, either there is a bug, or we have experienced
12925 syntax errors and the statement tree is malformed. */
12926 if (current_binding_level->kind != sk_function_parms)
12928 /* Make sure we have already experienced errors. */
12929 gcc_assert (errorcount);
12931 /* Throw away the broken statement tree and extra binding
12933 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12935 while (current_binding_level->kind != sk_function_parms)
12937 if (current_binding_level->kind == sk_class)
12938 pop_nested_class ();
12940 poplevel (0, 0, 0);
12943 poplevel (1, 0, 1);
12945 /* Statements should always be full-expressions at the outermost set
12946 of curly braces for a function. */
12947 gcc_assert (stmts_are_full_exprs_p ());
12949 /* Save constexpr function body before it gets munged by
12950 the NRV transformation. */
12951 maybe_save_function_definition (fndecl);
12953 /* Set up the named return value optimization, if we can. Candidate
12954 variables are selected in check_return_expr. */
12955 if (current_function_return_value)
12957 tree r = current_function_return_value;
12960 if (r != error_mark_node
12961 /* This is only worth doing for fns that return in memory--and
12962 simpler, since we don't have to worry about promoted modes. */
12963 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12964 /* Only allow this for variables declared in the outer scope of
12965 the function so we know that their lifetime always ends with a
12966 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12967 we were to do this optimization in tree-ssa. */
12968 && (outer = outer_curly_brace_block (fndecl))
12969 && chain_member (r, BLOCK_VARS (outer)))
12970 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12972 current_function_return_value = NULL_TREE;
12975 /* Remember that we were in class scope. */
12976 if (current_class_name)
12977 ctype = current_class_type;
12979 /* Must mark the RESULT_DECL as being in this function. */
12980 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12982 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12983 to the FUNCTION_DECL node itself. */
12984 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12986 /* Save away current state, if appropriate. */
12987 if (!processing_template_decl)
12988 save_function_data (fndecl);
12990 /* Complain if there's just no return statement. */
12991 if (warn_return_type
12992 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12993 && !dependent_type_p (TREE_TYPE (fntype))
12994 && !current_function_returns_value && !current_function_returns_null
12995 /* Don't complain if we abort or throw. */
12996 && !current_function_returns_abnormally
12997 /* Don't complain if we are declared noreturn. */
12998 && !TREE_THIS_VOLATILE (fndecl)
12999 && !DECL_NAME (DECL_RESULT (fndecl))
13000 && !TREE_NO_WARNING (fndecl)
13001 /* Structor return values (if any) are set by the compiler. */
13002 && !DECL_CONSTRUCTOR_P (fndecl)
13003 && !DECL_DESTRUCTOR_P (fndecl))
13005 warning (OPT_Wreturn_type,
13006 "no return statement in function returning non-void");
13007 TREE_NO_WARNING (fndecl) = 1;
13010 /* Store the end of the function, so that we get good line number
13011 info for the epilogue. */
13012 cfun->function_end_locus = input_location;
13014 /* Complain about parameters that are only set, but never otherwise used. */
13015 if (warn_unused_but_set_parameter
13016 && !processing_template_decl
13017 && errorcount == unused_but_set_errorcount
13018 && !DECL_CLONED_FUNCTION_P (fndecl))
13022 for (decl = DECL_ARGUMENTS (fndecl);
13024 decl = DECL_CHAIN (decl))
13025 if (TREE_USED (decl)
13026 && TREE_CODE (decl) == PARM_DECL
13027 && !DECL_READ_P (decl)
13028 && DECL_NAME (decl)
13029 && !DECL_ARTIFICIAL (decl)
13030 && !TREE_NO_WARNING (decl)
13031 && !DECL_IN_SYSTEM_HEADER (decl)
13032 && TREE_TYPE (decl) != error_mark_node
13033 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13034 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13035 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13036 warning (OPT_Wunused_but_set_parameter,
13037 "parameter %q+D set but not used", decl);
13038 unused_but_set_errorcount = errorcount;
13041 /* Genericize before inlining. */
13042 if (!processing_template_decl)
13044 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13045 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13046 cp_genericize (fndecl);
13047 /* Clear out the bits we don't need. */
13048 f->x_current_class_ptr = NULL;
13049 f->x_current_class_ref = NULL;
13050 f->x_eh_spec_block = NULL;
13051 f->x_in_charge_parm = NULL;
13052 f->x_vtt_parm = NULL;
13053 f->x_return_value = NULL;
13054 f->bindings = NULL;
13055 f->extern_decl_map = NULL;
13057 /* Clear out the bits we don't need. */
13058 local_names = NULL;
13060 /* We're leaving the context of this function, so zap cfun. It's still in
13061 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13063 current_function_decl = NULL;
13065 /* If this is an in-class inline definition, we may have to pop the
13066 bindings for the template parameters that we added in
13067 maybe_begin_member_template_processing when start_function was
13069 if (inclass_inline)
13070 maybe_end_member_template_processing ();
13072 /* Leave the scope of the class. */
13074 pop_nested_class ();
13079 current_function_decl = NULL_TREE;
13081 defer_mark_used_calls = false;
13082 if (deferred_mark_used_calls)
13087 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13089 VEC_free (tree, gc, deferred_mark_used_calls);
13095 /* Create the FUNCTION_DECL for a function definition.
13096 DECLSPECS and DECLARATOR are the parts of the declaration;
13097 they describe the return type and the name of the function,
13098 but twisted together in a fashion that parallels the syntax of C.
13100 This function creates a binding context for the function body
13101 as well as setting up the FUNCTION_DECL in current_function_decl.
13103 Returns a FUNCTION_DECL on success.
13105 If the DECLARATOR is not suitable for a function (it defines a datum
13106 instead), we return 0, which tells yyparse to report a parse error.
13108 May return void_type_node indicating that this method is actually
13109 a friend. See grokfield for more details.
13111 Came here with a `.pushlevel' .
13113 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13114 CHANGES TO CODE IN `grokfield'. */
13117 grokmethod (cp_decl_specifier_seq *declspecs,
13118 const cp_declarator *declarator, tree attrlist)
13120 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13123 if (fndecl == error_mark_node)
13124 return error_mark_node;
13126 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13128 error ("invalid member function declaration");
13129 return error_mark_node;
13133 cplus_decl_attributes (&fndecl, attrlist, 0);
13135 /* Pass friends other than inline friend functions back. */
13136 if (fndecl == void_type_node)
13139 if (DECL_IN_AGGR_P (fndecl))
13141 if (DECL_CLASS_SCOPE_P (fndecl))
13142 error ("%qD is already defined in class %qT", fndecl,
13143 DECL_CONTEXT (fndecl));
13144 return error_mark_node;
13147 check_template_shadow (fndecl);
13149 DECL_DECLARED_INLINE_P (fndecl) = 1;
13150 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13152 /* We process method specializations in finish_struct_1. */
13153 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13155 fndecl = push_template_decl (fndecl);
13156 if (fndecl == error_mark_node)
13160 if (! DECL_FRIEND_P (fndecl))
13162 if (DECL_CHAIN (fndecl))
13164 fndecl = copy_node (fndecl);
13165 TREE_CHAIN (fndecl) = NULL_TREE;
13169 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13171 DECL_IN_AGGR_P (fndecl) = 1;
13176 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13177 we can lay it out later, when and if its type becomes complete. */
13180 maybe_register_incomplete_var (tree var)
13182 gcc_assert (TREE_CODE (var) == VAR_DECL);
13184 /* Keep track of variables with incomplete types. */
13185 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13186 && DECL_EXTERNAL (var))
13188 tree inner_type = TREE_TYPE (var);
13190 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13191 inner_type = TREE_TYPE (inner_type);
13192 inner_type = TYPE_MAIN_VARIANT (inner_type);
13194 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13195 /* RTTI TD entries are created while defining the type_info. */
13196 || (TYPE_LANG_SPECIFIC (inner_type)
13197 && TYPE_BEING_DEFINED (inner_type)))
13200 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13202 iv->incomplete_type = inner_type;
13207 /* Called when a class type (given by TYPE) is defined. If there are
13208 any existing VAR_DECLs whose type has been completed by this
13209 declaration, update them now. */
13212 complete_vars (tree type)
13215 incomplete_var *iv;
13217 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13219 if (same_type_p (type, iv->incomplete_type))
13221 tree var = iv->decl;
13222 tree type = TREE_TYPE (var);
13223 /* Complete the type of the variable. The VAR_DECL itself
13224 will be laid out in expand_expr. */
13225 complete_type (type);
13226 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13227 /* Remove this entry from the list. */
13228 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13234 /* Check for pending declarations which may have abstract type. */
13235 complete_type_check_abstract (type);
13238 /* If DECL is of a type which needs a cleanup, build and return an
13239 expression to perform that cleanup here. Return NULL_TREE if no
13240 cleanup need be done. */
13243 cxx_maybe_build_cleanup (tree decl)
13249 /* Assume no cleanup is required. */
13250 cleanup = NULL_TREE;
13252 if (error_operand_p (decl))
13255 /* Handle "__attribute__((cleanup))". We run the cleanup function
13256 before the destructor since the destructor is what actually
13257 terminates the lifetime of the object. */
13258 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13265 /* Get the name specified by the user for the cleanup function. */
13266 id = TREE_VALUE (TREE_VALUE (attr));
13267 /* Look up the name to find the cleanup function to call. It is
13268 important to use lookup_name here because that is what is
13269 used in c-common.c:handle_cleanup_attribute when performing
13270 initial checks on the attribute. Note that those checks
13271 include ensuring that the function found is not an overloaded
13272 function, or an object with an overloaded call operator,
13273 etc.; we can rely on the fact that the function found is an
13274 ordinary FUNCTION_DECL. */
13275 fn = lookup_name (id);
13276 arg = build_address (decl);
13278 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13281 /* Handle ordinary C++ destructors. */
13282 type = TREE_TYPE (decl);
13283 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13285 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13286 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13287 && CLASSTYPE_VBASECLASSES (type));
13291 if (TREE_CODE (type) == ARRAY_TYPE)
13294 addr = build_address (decl);
13296 /* Optimize for space over speed here. */
13297 if (!has_vbases || flag_expensive_optimizations)
13298 flags |= LOOKUP_NONVIRTUAL;
13300 call = build_delete (TREE_TYPE (addr), addr,
13301 sfk_complete_destructor, flags, 0);
13303 cleanup = build_compound_expr (input_location, cleanup, call);
13311 /* When a stmt has been parsed, this function is called. */
13318 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13319 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13320 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13323 static_fn_type (tree memfntype)
13328 if (TYPE_PTRMEMFUNC_P (memfntype))
13329 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13330 if (POINTER_TYPE_P (memfntype)
13331 || TREE_CODE (memfntype) == FUNCTION_DECL)
13332 memfntype = TREE_TYPE (memfntype);
13333 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13335 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13336 args = TYPE_ARG_TYPES (memfntype);
13337 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13338 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13339 fntype = (cp_build_type_attribute_variant
13340 (fntype, TYPE_ATTRIBUTES (memfntype)));
13341 fntype = (build_exception_variant
13342 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13346 /* DECL was originally constructed as a non-static member function,
13347 but turned out to be static. Update it accordingly. */
13350 revert_static_member_fn (tree decl)
13352 tree stype = static_fn_type (decl);
13354 if (type_memfn_quals (stype) != TYPE_UNQUALIFIED)
13356 error ("static member function %q#D declared with type qualifiers", decl);
13357 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13359 TREE_TYPE (decl) = stype;
13361 if (DECL_ARGUMENTS (decl))
13362 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13363 DECL_STATIC_FUNCTION_P (decl) = 1;
13366 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13367 one of the language-independent trees. */
13369 enum cp_tree_node_structure_enum
13370 cp_tree_node_structure (union lang_tree_node * t)
13372 switch (TREE_CODE (&t->generic))
13374 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13375 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13376 case OVERLOAD: return TS_CP_OVERLOAD;
13377 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13378 case PTRMEM_CST: return TS_CP_PTRMEM;
13379 case BASELINK: return TS_CP_BASELINK;
13380 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13381 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13382 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13383 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13384 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13385 default: return TS_CP_GENERIC;
13389 /* Build the void_list_node (void_type_node having been created). */
13391 build_void_list_node (void)
13393 tree t = build_tree_list (NULL_TREE, void_type_node);
13398 cp_missing_noreturn_ok_p (tree decl)
13400 /* A missing noreturn is ok for the `main' function. */
13401 return DECL_MAIN_P (decl);
13404 /* Return the COMDAT group into which DECL should be placed. */
13407 cxx_comdat_group (tree decl)
13411 /* Virtual tables, construction virtual tables, and virtual table
13412 tables all go in a single COMDAT group, named after the primary
13414 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13415 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13416 /* For all other DECLs, the COMDAT group is the mangled name of the
13417 declaration itself. */
13420 while (DECL_THUNK_P (decl))
13422 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13423 into the same section as the target function. In that case
13424 we must return target's name. */
13425 tree target = THUNK_TARGET (decl);
13426 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13427 && DECL_SECTION_NAME (target) != NULL
13428 && DECL_ONE_ONLY (target))
13433 name = DECL_ASSEMBLER_NAME (decl);
13439 #include "gt-cp-decl.h"