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_start (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 = block_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 = block_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 timevar_stop (TV_NAME_LOOKUP);
822 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
823 itself, calling F for each. The DATA is passed to F as well. */
826 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
829 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
831 result |= (*f) (name_space, data);
833 for (; current; current = DECL_CHAIN (current))
834 result |= walk_namespaces_r (current, f, data);
839 /* Walk all the namespaces, calling F for each. The DATA is passed to
843 walk_namespaces (walk_namespaces_fn f, void* data)
845 return walk_namespaces_r (global_namespace, f, data);
848 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
849 DATA is non-NULL, this is the last time we will call
850 wrapup_global_declarations for this NAMESPACE. */
853 wrapup_globals_for_namespace (tree name_space, void* data)
855 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
856 VEC(tree,gc) *statics = level->static_decls;
857 tree *vec = VEC_address (tree, statics);
858 int len = VEC_length (tree, statics);
859 int last_time = (data != 0);
863 check_global_declarations (vec, len);
864 emit_debug_global_declarations (vec, len);
868 /* Write out any globals that need to be output. */
869 return wrapup_global_declarations (vec, len);
873 /* In C++, you don't have to write `struct S' to refer to `S'; you
874 can just use `S'. We accomplish this by creating a TYPE_DECL as
875 if the user had written `typedef struct S S'. Create and return
876 the TYPE_DECL for TYPE. */
879 create_implicit_typedef (tree name, tree type)
883 decl = build_decl (input_location, TYPE_DECL, name, type);
884 DECL_ARTIFICIAL (decl) = 1;
885 /* There are other implicit type declarations, like the one *within*
886 a class that allows you to write `S::S'. We must distinguish
888 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
889 TYPE_NAME (type) = decl;
890 TYPE_STUB_DECL (type) = decl;
895 /* Remember a local name for name-mangling purposes. */
898 push_local_name (tree decl)
903 timevar_start (TV_NAME_LOOKUP);
905 name = DECL_NAME (decl);
907 nelts = VEC_length (tree, local_names);
908 for (i = 0; i < nelts; i++)
910 t = VEC_index (tree, local_names, i);
911 if (DECL_NAME (t) == name)
913 if (!DECL_LANG_SPECIFIC (decl))
914 retrofit_lang_decl (decl);
915 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
916 if (DECL_LANG_SPECIFIC (t))
917 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
919 DECL_DISCRIMINATOR (decl) = 1;
921 VEC_replace (tree, local_names, i, decl);
922 timevar_stop (TV_NAME_LOOKUP);
927 VEC_safe_push (tree, gc, local_names, decl);
928 timevar_stop (TV_NAME_LOOKUP);
931 /* Subroutine of duplicate_decls: return truthvalue of whether
932 or not types of these decls match.
934 For C++, we must compare the parameter list so that `int' can match
935 `int&' in a parameter position, but `int&' is not confused with
939 decls_match (tree newdecl, tree olddecl)
943 if (newdecl == olddecl)
946 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
947 /* If the two DECLs are not even the same kind of thing, we're not
948 interested in their types. */
951 if (TREE_CODE (newdecl) == FUNCTION_DECL)
953 tree f1 = TREE_TYPE (newdecl);
954 tree f2 = TREE_TYPE (olddecl);
955 tree p1 = TYPE_ARG_TYPES (f1);
956 tree p2 = TYPE_ARG_TYPES (f2);
958 /* Specializations of different templates are different functions
959 even if they have the same type. */
960 tree t1 = (DECL_USE_TEMPLATE (newdecl)
961 ? DECL_TI_TEMPLATE (newdecl)
963 tree t2 = (DECL_USE_TEMPLATE (olddecl)
964 ? DECL_TI_TEMPLATE (olddecl)
969 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
970 && ! (DECL_EXTERN_C_P (newdecl)
971 && DECL_EXTERN_C_P (olddecl)))
974 #ifdef NO_IMPLICIT_EXTERN_C
975 /* A new declaration doesn't match a built-in one unless it
976 is also extern "C". */
977 if (DECL_IS_BUILTIN (olddecl)
978 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
982 if (TREE_CODE (f1) != TREE_CODE (f2))
985 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
987 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
988 && (DECL_BUILT_IN (olddecl)
989 #ifndef NO_IMPLICIT_EXTERN_C
990 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
991 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
995 types_match = self_promoting_args_p (p1);
996 if (p1 == void_list_node)
997 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
999 #ifndef NO_IMPLICIT_EXTERN_C
1000 else if (!prototype_p (f1)
1001 && (DECL_EXTERN_C_P (olddecl)
1002 && DECL_IN_SYSTEM_HEADER (olddecl)
1003 && !DECL_CLASS_SCOPE_P (olddecl))
1004 && (DECL_EXTERN_C_P (newdecl)
1005 && DECL_IN_SYSTEM_HEADER (newdecl)
1006 && !DECL_CLASS_SCOPE_P (newdecl)))
1008 types_match = self_promoting_args_p (p2);
1009 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1015 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1016 || comp_type_attributes (TREE_TYPE (newdecl),
1017 TREE_TYPE (olddecl)) != 0);
1022 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1024 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1025 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1028 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1029 DECL_TEMPLATE_PARMS (olddecl)))
1032 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1033 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1034 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1036 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1037 DECL_TEMPLATE_RESULT (newdecl));
1041 /* Need to check scope for variable declaration (VAR_DECL).
1042 For typedef (TYPE_DECL), scope is ignored. */
1043 if (TREE_CODE (newdecl) == VAR_DECL
1044 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1046 Two declarations for an object with C language linkage
1047 with the same name (ignoring the namespace that qualify
1048 it) that appear in different namespace scopes refer to
1050 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1053 if (TREE_TYPE (newdecl) == error_mark_node)
1054 types_match = TREE_TYPE (olddecl) == error_mark_node;
1055 else if (TREE_TYPE (olddecl) == NULL_TREE)
1056 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1057 else if (TREE_TYPE (newdecl) == NULL_TREE)
1060 types_match = comptypes (TREE_TYPE (newdecl),
1061 TREE_TYPE (olddecl),
1062 COMPARE_REDECLARATION);
1068 /* If NEWDECL is `static' and an `extern' was seen previously,
1069 warn about it. OLDDECL is the previous declaration.
1071 Note that this does not apply to the C++ case of declaring
1072 a variable `extern const' and then later `const'.
1074 Don't complain about built-in functions, since they are beyond
1075 the user's control. */
1078 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1080 if (TREE_CODE (newdecl) == TYPE_DECL
1081 || TREE_CODE (newdecl) == TEMPLATE_DECL
1082 || TREE_CODE (newdecl) == CONST_DECL
1083 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1086 /* Don't get confused by static member functions; that's a different
1088 if (TREE_CODE (newdecl) == FUNCTION_DECL
1089 && DECL_STATIC_FUNCTION_P (newdecl))
1092 /* If the old declaration was `static', or the new one isn't, then
1093 everything is OK. */
1094 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1097 /* It's OK to declare a builtin function as `static'. */
1098 if (TREE_CODE (olddecl) == FUNCTION_DECL
1099 && DECL_ARTIFICIAL (olddecl))
1102 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1103 permerror (input_location, "previous declaration of %q+D", olddecl);
1106 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1107 function templates. If their exception specifications do not
1108 match, issue a diagnostic. */
1111 check_redeclaration_exception_specification (tree new_decl,
1116 tree new_exceptions;
1117 tree old_exceptions;
1119 new_type = TREE_TYPE (new_decl);
1120 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1121 old_type = TREE_TYPE (old_decl);
1122 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1126 If any declaration of a function has an exception-specification,
1127 all declarations, including the definition and an explicit
1128 specialization, of that function shall have an
1129 exception-specification with the same set of type-ids. */
1130 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1131 && ! DECL_IS_BUILTIN (old_decl)
1133 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1135 error ("declaration of %qF has a different exception specifier",
1137 error ("from previous declaration %q+F", old_decl);
1141 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1142 Otherwise issue diagnostics. */
1145 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1147 old_decl = STRIP_TEMPLATE (old_decl);
1148 new_decl = STRIP_TEMPLATE (new_decl);
1149 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1150 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1152 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1153 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1155 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1157 /* Hide a built-in declaration. */
1158 DECL_DECLARED_CONSTEXPR_P (old_decl)
1159 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1162 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1163 error ("from previous declaration %q+D", old_decl);
1167 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1168 && lookup_attribute ("gnu_inline", \
1169 DECL_ATTRIBUTES (fn)))
1171 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1172 If the redeclaration is invalid, a diagnostic is issued, and the
1173 error_mark_node is returned. Otherwise, OLDDECL is returned.
1175 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1178 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1181 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1183 unsigned olddecl_uid = DECL_UID (olddecl);
1184 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1185 int new_defines_function = 0;
1186 tree new_template_info;
1188 if (newdecl == olddecl)
1191 types_match = decls_match (newdecl, olddecl);
1193 /* If either the type of the new decl or the type of the old decl is an
1194 error_mark_node, then that implies that we have already issued an
1195 error (earlier) for some bogus type specification, and in that case,
1196 it is rather pointless to harass the user with yet more error message
1197 about the same declaration, so just pretend the types match here. */
1198 if (TREE_TYPE (newdecl) == error_mark_node
1199 || TREE_TYPE (olddecl) == error_mark_node)
1200 return error_mark_node;
1202 if (DECL_P (olddecl)
1203 && TREE_CODE (newdecl) == FUNCTION_DECL
1204 && TREE_CODE (olddecl) == FUNCTION_DECL
1205 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1207 if (DECL_DECLARED_INLINE_P (newdecl)
1208 && DECL_UNINLINABLE (newdecl)
1209 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1210 /* Already warned elsewhere. */;
1211 else if (DECL_DECLARED_INLINE_P (olddecl)
1212 && DECL_UNINLINABLE (olddecl)
1213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1214 /* Already warned. */;
1215 else if (DECL_DECLARED_INLINE_P (newdecl)
1216 && DECL_UNINLINABLE (olddecl)
1217 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1219 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1221 warning (OPT_Wattributes, "previous declaration of %q+D "
1222 "with attribute noinline", olddecl);
1224 else if (DECL_DECLARED_INLINE_P (olddecl)
1225 && DECL_UNINLINABLE (newdecl)
1226 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1228 warning (OPT_Wattributes, "function %q+D redeclared with "
1229 "attribute noinline", newdecl);
1230 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1235 /* Check for redeclaration and other discrepancies. */
1236 if (TREE_CODE (olddecl) == FUNCTION_DECL
1237 && DECL_ARTIFICIAL (olddecl))
1239 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1240 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1242 /* Avoid warnings redeclaring built-ins which have not been
1243 explicitly declared. */
1244 if (DECL_ANTICIPATED (olddecl))
1247 /* If you declare a built-in or predefined function name as static,
1248 the old definition is overridden, but optionally warn this was a
1249 bad choice of name. */
1250 if (! TREE_PUBLIC (newdecl))
1252 warning (OPT_Wshadow,
1253 DECL_BUILT_IN (olddecl)
1254 ? G_("shadowing built-in function %q#D")
1255 : G_("shadowing library function %q#D"), olddecl);
1256 /* Discard the old built-in function. */
1259 /* If the built-in is not ansi, then programs can override
1260 it even globally without an error. */
1261 else if (! DECL_BUILT_IN (olddecl))
1262 warning (0, "library function %q#D redeclared as non-function %q#D",
1266 error ("declaration of %q#D", newdecl);
1267 error ("conflicts with built-in declaration %q#D",
1272 else if (!types_match)
1274 /* Avoid warnings redeclaring built-ins which have not been
1275 explicitly declared. */
1276 if (DECL_ANTICIPATED (olddecl))
1278 /* Deal with fileptr_type_node. FILE type is not known
1279 at the time we create the builtins. */
1282 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1283 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1285 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1288 else if (TREE_VALUE (t2) == fileptr_type_node)
1290 tree t = TREE_VALUE (t1);
1292 if (TREE_CODE (t) == POINTER_TYPE
1293 && TYPE_NAME (TREE_TYPE (t))
1294 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1295 == get_identifier ("FILE")
1296 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1298 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1300 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1301 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1302 types_match = decls_match (newdecl, olddecl);
1304 return duplicate_decls (newdecl, olddecl,
1306 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1309 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1312 else if ((DECL_EXTERN_C_P (newdecl)
1313 && DECL_EXTERN_C_P (olddecl))
1314 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1315 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1317 /* A near match; override the builtin. */
1319 if (TREE_PUBLIC (newdecl))
1321 warning (0, "new declaration %q#D", newdecl);
1322 warning (0, "ambiguates built-in declaration %q#D",
1326 warning (OPT_Wshadow,
1327 DECL_BUILT_IN (olddecl)
1328 ? G_("shadowing built-in function %q#D")
1329 : G_("shadowing library function %q#D"), olddecl);
1332 /* Discard the old built-in function. */
1335 /* Replace the old RTL to avoid problems with inlining. */
1336 COPY_DECL_RTL (newdecl, olddecl);
1338 /* Even if the types match, prefer the new declarations type for
1339 built-ins which have not been explicitly declared, for
1340 exception lists, etc... */
1341 else if (DECL_IS_BUILTIN (olddecl))
1343 tree type = TREE_TYPE (newdecl);
1344 tree attribs = (*targetm.merge_type_attributes)
1345 (TREE_TYPE (olddecl), type);
1347 type = cp_build_type_attribute_variant (type, attribs);
1348 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1351 /* If a function is explicitly declared "throw ()", propagate that to
1352 the corresponding builtin. */
1353 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1354 && DECL_ANTICIPATED (olddecl)
1355 && TREE_NOTHROW (newdecl)
1356 && !TREE_NOTHROW (olddecl)
1357 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1358 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1360 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1362 /* Whether or not the builtin can throw exceptions has no
1363 bearing on this declarator. */
1364 TREE_NOTHROW (olddecl) = 0;
1366 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1368 /* If a builtin function is redeclared as `static', merge
1369 the declarations, but make the original one static. */
1370 DECL_THIS_STATIC (olddecl) = 1;
1371 TREE_PUBLIC (olddecl) = 0;
1373 /* Make the old declaration consistent with the new one so
1374 that all remnants of the builtin-ness of this function
1375 will be banished. */
1376 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1377 COPY_DECL_RTL (newdecl, olddecl);
1380 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1382 /* C++ Standard, 3.3, clause 4:
1383 "[Note: a namespace name or a class template name must be unique
1384 in its declarative region (7.3.2, clause 14). ]" */
1385 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1386 && TREE_CODE (newdecl) != NAMESPACE_DECL
1387 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1388 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1389 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1390 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1392 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1393 && TREE_CODE (newdecl) != TYPE_DECL)
1394 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1395 && TREE_CODE (olddecl) != TYPE_DECL))
1397 /* We do nothing special here, because C++ does such nasty
1398 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1399 get shadowed, and know that if we need to find a TYPE_DECL
1400 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1401 slot of the identifier. */
1405 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1406 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1407 || (TREE_CODE (olddecl) == FUNCTION_DECL
1408 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1412 error ("%q#D redeclared as different kind of symbol", newdecl);
1413 if (TREE_CODE (olddecl) == TREE_LIST)
1414 olddecl = TREE_VALUE (olddecl);
1415 error ("previous declaration of %q+#D", olddecl);
1417 return error_mark_node;
1419 else if (!types_match)
1421 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1422 /* These are certainly not duplicate declarations; they're
1423 from different scopes. */
1426 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1428 /* The name of a class template may not be declared to refer to
1429 any other template, class, function, object, namespace, value,
1430 or type in the same scope. */
1431 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1432 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1434 error ("declaration of template %q#D", newdecl);
1435 error ("conflicts with previous declaration %q+#D", olddecl);
1437 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1438 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1439 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1440 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1441 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1442 DECL_TEMPLATE_PARMS (olddecl))
1443 /* Template functions can be disambiguated by
1445 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1446 TREE_TYPE (TREE_TYPE (olddecl))))
1448 error ("new declaration %q#D", newdecl);
1449 error ("ambiguates old declaration %q+#D", olddecl);
1453 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1455 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1457 error ("declaration of C function %q#D conflicts with",
1459 error ("previous declaration %q+#D here", olddecl);
1462 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1463 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1465 error ("new declaration %q#D", newdecl);
1466 error ("ambiguates old declaration %q+#D", olddecl);
1467 return error_mark_node;
1474 error ("conflicting declaration %q#D", newdecl);
1475 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1476 return error_mark_node;
1479 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1480 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1481 && (!DECL_TEMPLATE_INFO (newdecl)
1482 || (DECL_TI_TEMPLATE (newdecl)
1483 != DECL_TI_TEMPLATE (olddecl))))
1484 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1485 && (!DECL_TEMPLATE_INFO (olddecl)
1486 || (DECL_TI_TEMPLATE (olddecl)
1487 != DECL_TI_TEMPLATE (newdecl))))))
1488 /* It's OK to have a template specialization and a non-template
1489 with the same type, or to have specializations of two
1490 different templates with the same type. Note that if one is a
1491 specialization, and the other is an instantiation of the same
1492 template, that we do not exit at this point. That situation
1493 can occur if we instantiate a template class, and then
1494 specialize one of its methods. This situation is valid, but
1495 the declarations must be merged in the usual way. */
1497 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1498 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1499 && !DECL_USE_TEMPLATE (newdecl))
1500 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1501 && !DECL_USE_TEMPLATE (olddecl))))
1502 /* One of the declarations is a template instantiation, and the
1503 other is not a template at all. That's OK. */
1505 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1507 /* In [namespace.alias] we have:
1509 In a declarative region, a namespace-alias-definition can be
1510 used to redefine a namespace-alias declared in that declarative
1511 region to refer only to the namespace to which it already
1514 Therefore, if we encounter a second alias directive for the same
1515 alias, we can just ignore the second directive. */
1516 if (DECL_NAMESPACE_ALIAS (newdecl)
1517 && (DECL_NAMESPACE_ALIAS (newdecl)
1518 == DECL_NAMESPACE_ALIAS (olddecl)))
1520 /* [namespace.alias]
1522 A namespace-name or namespace-alias shall not be declared as
1523 the name of any other entity in the same declarative region.
1524 A namespace-name defined at global scope shall not be
1525 declared as the name of any other entity in any global scope
1527 error ("declaration of namespace %qD conflicts with", newdecl);
1528 error ("previous declaration of namespace %q+D here", olddecl);
1529 return error_mark_node;
1533 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1536 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1537 if (DECL_NAME (olddecl) != NULL_TREE)
1538 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1539 ? "%q+#D previously defined here"
1540 : "%q+#D previously declared here", olddecl);
1541 return error_mark_node;
1543 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1544 && DECL_INITIAL (olddecl) != NULL_TREE
1545 && !prototype_p (TREE_TYPE (olddecl))
1546 && prototype_p (TREE_TYPE (newdecl)))
1548 /* Prototype decl follows defn w/o prototype. */
1549 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1550 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1551 "follows non-prototype definition here");
1553 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1554 || TREE_CODE (olddecl) == VAR_DECL)
1555 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1558 If two declarations of the same function or object
1559 specify different linkage-specifications ..., the program
1560 is ill-formed.... Except for functions with C++ linkage,
1561 a function declaration without a linkage specification
1562 shall not precede the first linkage specification for
1563 that function. A function can be declared without a
1564 linkage specification after an explicit linkage
1565 specification has been seen; the linkage explicitly
1566 specified in the earlier declaration is not affected by
1567 such a function declaration.
1569 DR 563 raises the question why the restrictions on
1570 functions should not also apply to objects. Older
1571 versions of G++ silently ignore the linkage-specification
1579 which is clearly wrong. Therefore, we now treat objects
1581 if (current_lang_depth () == 0)
1583 /* There is no explicit linkage-specification, so we use
1584 the linkage from the previous declaration. */
1585 if (!DECL_LANG_SPECIFIC (newdecl))
1586 retrofit_lang_decl (newdecl);
1587 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1591 error ("previous declaration of %q+#D with %qL linkage",
1592 olddecl, DECL_LANGUAGE (olddecl));
1593 error ("conflicts with new declaration with %qL linkage",
1594 DECL_LANGUAGE (newdecl));
1598 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1600 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1602 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1603 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1606 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1607 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1609 for (; t1 && t1 != void_list_node;
1610 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1611 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1613 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1616 permerror (input_location, "default argument given for parameter %d of %q#D",
1618 permerror (input_location, "after previous specification in %q+#D", olddecl);
1622 error ("default argument given for parameter %d of %q#D",
1624 error ("after previous specification in %q+#D",
1631 /* Do not merge an implicit typedef with an explicit one. In:
1635 typedef class A A __attribute__ ((foo));
1637 the attribute should apply only to the typedef. */
1638 if (TREE_CODE (olddecl) == TYPE_DECL
1639 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1640 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1643 /* If new decl is `static' and an `extern' was seen previously,
1645 warn_extern_redeclared_static (newdecl, olddecl);
1647 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1648 return error_mark_node;
1650 /* We have committed to returning 1 at this point. */
1651 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1653 /* Now that functions must hold information normally held
1654 by field decls, there is extra work to do so that
1655 declaration information does not get destroyed during
1657 if (DECL_VINDEX (olddecl))
1658 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1659 if (DECL_CONTEXT (olddecl))
1660 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1661 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1662 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1663 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1664 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1665 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1666 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1667 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1668 SET_OVERLOADED_OPERATOR_CODE
1669 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1670 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1672 /* Optionally warn about more than one declaration for the same
1673 name, but don't warn about a function declaration followed by a
1675 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1676 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1677 /* Don't warn about extern decl followed by definition. */
1678 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1679 /* Don't warn about friends, let add_friend take care of it. */
1680 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1682 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1683 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1686 if (DECL_DELETED_FN (newdecl))
1688 error ("deleted definition of %qD", newdecl);
1689 error ("after previous declaration %q+D", olddecl);
1693 /* Deal with C++: must preserve virtual function table size. */
1694 if (TREE_CODE (olddecl) == TYPE_DECL)
1696 tree newtype = TREE_TYPE (newdecl);
1697 tree oldtype = TREE_TYPE (olddecl);
1699 if (newtype != error_mark_node && oldtype != error_mark_node
1700 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1701 CLASSTYPE_FRIEND_CLASSES (newtype)
1702 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1704 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1707 /* Copy all the DECL_... slots specified in the new decl
1708 except for any that we copy here from the old type. */
1709 DECL_ATTRIBUTES (newdecl)
1710 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1712 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1716 old_result = DECL_TEMPLATE_RESULT (olddecl);
1717 new_result = DECL_TEMPLATE_RESULT (newdecl);
1718 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1719 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1720 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1721 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1723 DECL_ATTRIBUTES (old_result)
1724 = (*targetm.merge_decl_attributes) (old_result, new_result);
1726 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1728 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1729 && DECL_INITIAL (new_result))
1731 if (DECL_INITIAL (old_result))
1732 DECL_UNINLINABLE (old_result) = 1;
1734 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1735 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1736 DECL_NOT_REALLY_EXTERN (old_result)
1737 = DECL_NOT_REALLY_EXTERN (new_result);
1738 DECL_INTERFACE_KNOWN (old_result)
1739 = DECL_INTERFACE_KNOWN (new_result);
1740 DECL_DECLARED_INLINE_P (old_result)
1741 = DECL_DECLARED_INLINE_P (new_result);
1742 DECL_DISREGARD_INLINE_LIMITS (old_result)
1743 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1748 DECL_DECLARED_INLINE_P (old_result)
1749 |= DECL_DECLARED_INLINE_P (new_result);
1750 DECL_DISREGARD_INLINE_LIMITS (old_result)
1751 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1752 check_redeclaration_exception_specification (newdecl, olddecl);
1756 /* If the new declaration is a definition, update the file and
1757 line information on the declaration, and also make
1758 the old declaration the same definition. */
1759 if (DECL_INITIAL (new_result) != NULL_TREE)
1761 DECL_SOURCE_LOCATION (olddecl)
1762 = DECL_SOURCE_LOCATION (old_result)
1763 = DECL_SOURCE_LOCATION (newdecl);
1764 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1765 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1768 DECL_ARGUMENTS (old_result)
1769 = DECL_ARGUMENTS (new_result);
1770 for (parm = DECL_ARGUMENTS (old_result); parm;
1771 parm = DECL_CHAIN (parm))
1772 DECL_CONTEXT (parm) = old_result;
1781 /* Automatically handles default parameters. */
1782 tree oldtype = TREE_TYPE (olddecl);
1785 /* Merge the data types specified in the two decls. */
1786 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1788 /* If merge_types produces a non-typedef type, just use the old type. */
1789 if (TREE_CODE (newdecl) == TYPE_DECL
1790 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1793 if (TREE_CODE (newdecl) == VAR_DECL)
1795 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1796 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1797 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1798 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1799 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1800 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1802 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1803 if (DECL_LANG_SPECIFIC (olddecl)
1804 && CP_DECL_THREADPRIVATE_P (olddecl))
1806 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1807 if (!DECL_LANG_SPECIFIC (newdecl))
1808 retrofit_lang_decl (newdecl);
1810 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1811 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1815 /* Do this after calling `merge_types' so that default
1816 parameters don't confuse us. */
1817 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1818 check_redeclaration_exception_specification (newdecl, olddecl);
1819 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1821 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1822 check_default_args (newdecl);
1824 /* Lay the type out, unless already done. */
1825 if (! same_type_p (newtype, oldtype)
1826 && TREE_TYPE (newdecl) != error_mark_node
1827 && !(processing_template_decl && uses_template_parms (newdecl)))
1828 layout_type (TREE_TYPE (newdecl));
1830 if ((TREE_CODE (newdecl) == VAR_DECL
1831 || TREE_CODE (newdecl) == PARM_DECL
1832 || TREE_CODE (newdecl) == RESULT_DECL
1833 || TREE_CODE (newdecl) == FIELD_DECL
1834 || TREE_CODE (newdecl) == TYPE_DECL)
1835 && !(processing_template_decl && uses_template_parms (newdecl)))
1836 layout_decl (newdecl, 0);
1838 /* Merge the type qualifiers. */
1839 if (TREE_READONLY (newdecl))
1840 TREE_READONLY (olddecl) = 1;
1841 if (TREE_THIS_VOLATILE (newdecl))
1842 TREE_THIS_VOLATILE (olddecl) = 1;
1843 if (TREE_NOTHROW (newdecl))
1844 TREE_NOTHROW (olddecl) = 1;
1846 /* Merge deprecatedness. */
1847 if (TREE_DEPRECATED (newdecl))
1848 TREE_DEPRECATED (olddecl) = 1;
1850 /* Preserve function specific target and optimization options */
1851 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1853 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1854 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1855 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1856 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1858 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1859 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1860 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1861 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1864 /* Merge the initialization information. */
1865 if (DECL_INITIAL (newdecl) == NULL_TREE
1866 && DECL_INITIAL (olddecl) != NULL_TREE)
1868 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1869 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1870 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1872 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1873 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1877 /* Merge the section attribute.
1878 We want to issue an error if the sections conflict but that must be
1879 done later in decl_attributes since we are called before attributes
1881 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1882 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1884 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1886 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1887 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1888 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1889 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1890 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1891 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1892 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1893 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1894 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1895 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1896 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1897 /* Keep the old RTL. */
1898 COPY_DECL_RTL (olddecl, newdecl);
1900 else if (TREE_CODE (newdecl) == VAR_DECL
1901 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1903 /* Keep the old RTL. We cannot keep the old RTL if the old
1904 declaration was for an incomplete object and the new
1905 declaration is not since many attributes of the RTL will
1907 COPY_DECL_RTL (olddecl, newdecl);
1910 /* If cannot merge, then use the new type and qualifiers,
1911 and don't preserve the old rtl. */
1914 /* Clean out any memory we had of the old declaration. */
1915 tree oldstatic = value_member (olddecl, static_aggregates);
1917 TREE_VALUE (oldstatic) = error_mark_node;
1919 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1920 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1921 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1922 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1925 /* Merge the storage class information. */
1926 merge_weak (newdecl, olddecl);
1928 if (DECL_ONE_ONLY (olddecl))
1929 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1931 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1932 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1933 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1934 if (! DECL_EXTERNAL (olddecl))
1935 DECL_EXTERNAL (newdecl) = 0;
1937 new_template_info = NULL_TREE;
1938 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1940 bool new_redefines_gnu_inline = false;
1942 if (new_defines_function
1943 && ((DECL_INTERFACE_KNOWN (olddecl)
1944 && TREE_CODE (olddecl) == FUNCTION_DECL)
1945 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1946 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1947 == FUNCTION_DECL))))
1951 if (TREE_CODE (fn) == TEMPLATE_DECL)
1952 fn = DECL_TEMPLATE_RESULT (olddecl);
1954 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1957 if (!new_redefines_gnu_inline)
1959 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1960 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1961 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1963 DECL_TEMPLATE_INSTANTIATED (newdecl)
1964 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1965 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1967 /* If the OLDDECL is an instantiation and/or specialization,
1968 then the NEWDECL must be too. But, it may not yet be marked
1969 as such if the caller has created NEWDECL, but has not yet
1970 figured out that it is a redeclaration. */
1971 if (!DECL_USE_TEMPLATE (newdecl))
1972 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1974 /* Don't really know how much of the language-specific
1975 values we should copy from old to new. */
1976 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1977 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1978 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1979 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1981 if (LANG_DECL_HAS_MIN (newdecl))
1983 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1984 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1985 if (DECL_TEMPLATE_INFO (newdecl))
1986 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1987 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1989 /* Only functions have these fields. */
1990 if (TREE_CODE (newdecl) == FUNCTION_DECL
1991 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1993 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1994 olddecl_friend = DECL_FRIEND_P (olddecl);
1995 hidden_friend = (DECL_ANTICIPATED (olddecl)
1996 && DECL_HIDDEN_FRIEND_P (olddecl)
1997 && newdecl_is_friend);
1998 DECL_BEFRIENDING_CLASSES (newdecl)
1999 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2000 DECL_BEFRIENDING_CLASSES (olddecl));
2001 /* DECL_THUNKS is only valid for virtual functions,
2002 otherwise it is a DECL_FRIEND_CONTEXT. */
2003 if (DECL_VIRTUAL_P (newdecl))
2004 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2006 /* Only variables have this field. */
2007 else if (TREE_CODE (newdecl) == VAR_DECL
2008 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2009 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2012 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2016 /* Merge parameter attributes. */
2017 tree oldarg, newarg;
2018 for (oldarg = DECL_ARGUMENTS(olddecl),
2019 newarg = DECL_ARGUMENTS(newdecl);
2021 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2022 DECL_ATTRIBUTES (newarg)
2023 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2024 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2027 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2028 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2030 /* If newdecl is not a specialization, then it is not a
2031 template-related function at all. And that means that we
2032 should have exited above, returning 0. */
2033 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2035 if (DECL_ODR_USED (olddecl))
2036 /* From [temp.expl.spec]:
2038 If a template, a member template or the member of a class
2039 template is explicitly specialized then that
2040 specialization shall be declared before the first use of
2041 that specialization that would cause an implicit
2042 instantiation to take place, in every translation unit in
2043 which such a use occurs. */
2044 error ("explicit specialization of %qD after first use",
2047 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2049 /* Don't propagate visibility from the template to the
2050 specialization here. We'll do that in determine_visibility if
2052 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2054 /* [temp.expl.spec/14] We don't inline explicit specialization
2055 just because the primary template says so. */
2057 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2058 the always_inline attribute. */
2059 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2060 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2062 if (DECL_DECLARED_INLINE_P (newdecl))
2063 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2065 DECL_ATTRIBUTES (newdecl)
2066 = remove_attribute ("always_inline",
2067 DECL_ATTRIBUTES (newdecl));
2070 else if (new_defines_function && DECL_INITIAL (olddecl))
2072 /* Never inline re-defined extern inline functions.
2073 FIXME: this could be better handled by keeping both
2074 function as separate declarations. */
2075 DECL_UNINLINABLE (newdecl) = 1;
2079 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2080 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2082 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2084 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2085 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2087 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2088 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2089 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2090 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2093 /* Preserve abstractness on cloned [cd]tors. */
2094 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2096 /* Update newdecl's parms to point at olddecl. */
2097 for (parm = DECL_ARGUMENTS (newdecl); parm;
2098 parm = DECL_CHAIN (parm))
2099 DECL_CONTEXT (parm) = olddecl;
2103 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2104 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2105 COPY_DECL_RTL (newdecl, olddecl);
2107 if (! types_match || new_defines_function)
2109 /* These need to be copied so that the names are available.
2110 Note that if the types do match, we'll preserve inline
2111 info and other bits, but if not, we won't. */
2112 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2113 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2115 if (new_defines_function)
2116 /* If defining a function declared with other language
2117 linkage, use the previously declared language linkage. */
2118 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2119 else if (types_match)
2121 /* If redeclaring a builtin function, and not a definition,
2122 it stays built in. */
2123 if (DECL_BUILT_IN (olddecl))
2125 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2126 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2127 /* If we're keeping the built-in definition, keep the rtl,
2128 regardless of declaration matches. */
2129 COPY_DECL_RTL (olddecl, newdecl);
2132 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2133 /* Don't clear out the arguments if we're just redeclaring a
2135 if (DECL_ARGUMENTS (olddecl))
2136 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2139 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2140 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2142 /* Now preserve various other info from the definition. */
2143 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2144 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2145 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2146 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2148 /* Warn about conflicting visibility specifications. */
2149 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2150 && DECL_VISIBILITY_SPECIFIED (newdecl)
2151 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2153 warning_at (input_location, OPT_Wattributes,
2154 "%q+D: visibility attribute ignored because it", newdecl);
2155 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2156 "conflicts with previous declaration here");
2158 /* Choose the declaration which specified visibility. */
2159 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2161 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2162 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2164 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2165 so keep this behavior. */
2166 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2168 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2169 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2171 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2172 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2173 if (TREE_CODE (newdecl) == FIELD_DECL)
2174 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2176 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2177 with that from NEWDECL below. */
2178 if (DECL_LANG_SPECIFIC (olddecl))
2180 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2181 != DECL_LANG_SPECIFIC (newdecl));
2182 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2185 /* Merge the USED information. */
2186 if (TREE_USED (olddecl))
2187 TREE_USED (newdecl) = 1;
2188 else if (TREE_USED (newdecl))
2189 TREE_USED (olddecl) = 1;
2190 if (TREE_CODE (newdecl) == VAR_DECL)
2192 if (DECL_READ_P (olddecl))
2193 DECL_READ_P (newdecl) = 1;
2194 else if (DECL_READ_P (newdecl))
2195 DECL_READ_P (olddecl) = 1;
2197 if (DECL_PRESERVE_P (olddecl))
2198 DECL_PRESERVE_P (newdecl) = 1;
2199 else if (DECL_PRESERVE_P (newdecl))
2200 DECL_PRESERVE_P (olddecl) = 1;
2202 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2206 function_size = sizeof (struct tree_decl_common);
2208 memcpy ((char *) olddecl + sizeof (struct tree_common),
2209 (char *) newdecl + sizeof (struct tree_common),
2210 function_size - sizeof (struct tree_common));
2212 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2213 (char *) newdecl + sizeof (struct tree_decl_common),
2214 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2215 if (new_template_info)
2216 /* If newdecl is a template instantiation, it is possible that
2217 the following sequence of events has occurred:
2219 o A friend function was declared in a class template. The
2220 class template was instantiated.
2222 o The instantiation of the friend declaration was
2223 recorded on the instantiation list, and is newdecl.
2225 o Later, however, instantiate_class_template called pushdecl
2226 on the newdecl to perform name injection. But, pushdecl in
2227 turn called duplicate_decls when it discovered that another
2228 declaration of a global function with the same name already
2231 o Here, in duplicate_decls, we decided to clobber newdecl.
2233 If we're going to do that, we'd better make sure that
2234 olddecl, and not newdecl, is on the list of
2235 instantiations so that if we try to do the instantiation
2236 again we won't get the clobbered declaration. */
2237 reregister_specialization (newdecl,
2243 size_t size = tree_code_size (TREE_CODE (olddecl));
2244 memcpy ((char *) olddecl + sizeof (struct tree_common),
2245 (char *) newdecl + sizeof (struct tree_common),
2246 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2247 switch (TREE_CODE (olddecl))
2257 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2258 (char *) newdecl + sizeof (struct tree_decl_common),
2259 size - sizeof (struct tree_decl_common)
2260 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2264 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2265 (char *) newdecl + sizeof (struct tree_decl_common),
2266 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2267 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2271 DECL_UID (olddecl) = olddecl_uid;
2273 DECL_FRIEND_P (olddecl) = 1;
2276 DECL_ANTICIPATED (olddecl) = 1;
2277 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2280 /* NEWDECL contains the merged attribute lists.
2281 Update OLDDECL to be the same. */
2282 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2284 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2285 so that encode_section_info has a chance to look at the new decl
2286 flags and attributes. */
2287 if (DECL_RTL_SET_P (olddecl)
2288 && (TREE_CODE (olddecl) == FUNCTION_DECL
2289 || (TREE_CODE (olddecl) == VAR_DECL
2290 && TREE_STATIC (olddecl))))
2291 make_decl_rtl (olddecl);
2293 /* The NEWDECL will no longer be needed. Because every out-of-class
2294 declaration of a member results in a call to duplicate_decls,
2295 freeing these nodes represents in a significant savings. */
2301 /* Return zero if the declaration NEWDECL is valid
2302 when the declaration OLDDECL (assumed to be for the same name)
2303 has already been seen.
2304 Otherwise return an error message format string with a %s
2305 where the identifier should go. */
2308 redeclaration_error_message (tree newdecl, tree olddecl)
2310 if (TREE_CODE (newdecl) == TYPE_DECL)
2312 /* Because C++ can put things into name space for free,
2313 constructs like "typedef struct foo { ... } foo"
2314 would look like an erroneous redeclaration. */
2315 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2318 return G_("redefinition of %q#D");
2320 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2322 /* If this is a pure function, its olddecl will actually be
2323 the original initialization to `0' (which we force to call
2324 abort()). Don't complain about redefinition in this case. */
2325 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2326 && DECL_INITIAL (olddecl) == NULL_TREE)
2329 /* If both functions come from different namespaces, this is not
2330 a redeclaration - this is a conflict with a used function. */
2331 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2332 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2333 && ! decls_match (olddecl, newdecl))
2334 return G_("%qD conflicts with used function");
2336 /* We'll complain about linkage mismatches in
2337 warn_extern_redeclared_static. */
2339 /* Defining the same name twice is no good. */
2340 if (DECL_INITIAL (olddecl) != NULL_TREE
2341 && DECL_INITIAL (newdecl) != NULL_TREE)
2343 if (DECL_NAME (olddecl) == NULL_TREE)
2344 return G_("%q#D not declared in class");
2345 else if (!GNU_INLINE_P (olddecl)
2346 || GNU_INLINE_P (newdecl))
2347 return G_("redefinition of %q#D");
2350 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2352 bool olda = GNU_INLINE_P (olddecl);
2353 bool newa = GNU_INLINE_P (newdecl);
2358 return G_("%q+D redeclared inline with "
2359 "%<gnu_inline%> attribute");
2361 return G_("%q+D redeclared inline without "
2362 "%<gnu_inline%> attribute");
2368 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2372 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2374 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2375 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2376 return G_("redefinition of %q#D");
2380 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2381 || (DECL_TEMPLATE_RESULT (newdecl)
2382 == DECL_TEMPLATE_RESULT (olddecl)))
2385 nt = DECL_TEMPLATE_RESULT (newdecl);
2386 if (DECL_TEMPLATE_INFO (nt))
2387 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2388 ot = DECL_TEMPLATE_RESULT (olddecl);
2389 if (DECL_TEMPLATE_INFO (ot))
2390 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2391 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2392 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2393 return G_("redefinition of %q#D");
2395 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2397 bool olda = GNU_INLINE_P (ot);
2398 bool newa = GNU_INLINE_P (nt);
2403 return G_("%q+D redeclared inline with "
2404 "%<gnu_inline%> attribute");
2406 return G_("%q+D redeclared inline without "
2407 "%<gnu_inline%> attribute");
2411 /* Core issue #226 (C++0x):
2413 If a friend function template declaration specifies a
2414 default template-argument, that declaration shall be a
2415 definition and shall be the only declaration of the
2416 function template in the translation unit. */
2417 if ((cxx_dialect != cxx98)
2418 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2419 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2420 /*is_primary=*/1, /*is_partial=*/0,
2421 /*is_friend_decl=*/2))
2422 return G_("redeclaration of friend %q#D "
2423 "may not have default template arguments");
2427 else if (TREE_CODE (newdecl) == VAR_DECL
2428 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2429 && (! DECL_LANG_SPECIFIC (olddecl)
2430 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2431 || DECL_THREAD_LOCAL_P (newdecl)))
2433 /* Only variables can be thread-local, and all declarations must
2434 agree on this property. */
2435 if (DECL_THREAD_LOCAL_P (newdecl))
2436 return G_("thread-local declaration of %q#D follows "
2437 "non-thread-local declaration");
2439 return G_("non-thread-local declaration of %q#D follows "
2440 "thread-local declaration");
2442 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2444 /* The objects have been declared at namespace scope. If either
2445 is a member of an anonymous union, then this is an invalid
2446 redeclaration. For example:
2452 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2453 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2454 return G_("redeclaration of %q#D");
2455 /* If at least one declaration is a reference, there is no
2456 conflict. For example:
2462 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2464 /* Reject two definitions. */
2465 return G_("redefinition of %q#D");
2469 /* Objects declared with block scope: */
2470 /* Reject two definitions, and reject a definition
2471 together with an external reference. */
2472 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2473 return G_("redeclaration of %q#D");
2478 /* Hash and equality functions for the named_label table. */
2481 named_label_entry_hash (const void *data)
2483 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2484 return DECL_UID (ent->label_decl);
2488 named_label_entry_eq (const void *a, const void *b)
2490 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2491 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2492 return ent_a->label_decl == ent_b->label_decl;
2495 /* Create a new label, named ID. */
2498 make_label_decl (tree id, int local_p)
2500 struct named_label_entry *ent;
2504 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2506 DECL_CONTEXT (decl) = current_function_decl;
2507 DECL_MODE (decl) = VOIDmode;
2508 C_DECLARED_LABEL_FLAG (decl) = local_p;
2510 /* Say where one reference is to the label, for the sake of the
2511 error if it is not defined. */
2512 DECL_SOURCE_LOCATION (decl) = input_location;
2514 /* Record the fact that this identifier is bound to this label. */
2515 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2517 /* Create the label htab for the function on demand. */
2519 named_labels = htab_create_ggc (13, named_label_entry_hash,
2520 named_label_entry_eq, NULL);
2522 /* Record this label on the list of labels used in this function.
2523 We do this before calling make_label_decl so that we get the
2524 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2525 ent = ggc_alloc_cleared_named_label_entry ();
2526 ent->label_decl = decl;
2528 slot = htab_find_slot (named_labels, ent, INSERT);
2529 gcc_assert (*slot == NULL);
2535 /* Look for a label named ID in the current function. If one cannot
2536 be found, create one. (We keep track of used, but undefined,
2537 labels, and complain about them at the end of a function.) */
2540 lookup_label_1 (tree id)
2544 /* You can't use labels at global scope. */
2545 if (current_function_decl == NULL_TREE)
2547 error ("label %qE referenced outside of any function", id);
2551 /* See if we've already got this label. */
2552 decl = IDENTIFIER_LABEL_VALUE (id);
2553 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2556 decl = make_label_decl (id, /*local_p=*/0);
2560 /* Wrapper for lookup_label_1. */
2563 lookup_label (tree id)
2566 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2567 ret = lookup_label_1 (id);
2568 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2572 /* Declare a local label named ID. */
2575 declare_local_label (tree id)
2578 cp_label_binding *bind;
2580 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2581 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2582 bind = VEC_safe_push (cp_label_binding, gc,
2583 current_binding_level->shadowed_labels, NULL);
2584 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2586 decl = make_label_decl (id, /*local_p=*/1);
2592 /* Returns nonzero if it is ill-formed to jump past the declaration of
2593 DECL. Returns 2 if it's also a real problem. */
2596 decl_jump_unsafe (tree decl)
2598 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2599 with automatic storage duration is not in scope to a point where it is
2600 in scope is ill-formed unless the variable has scalar type, class type
2601 with a trivial default constructor and a trivial destructor, a
2602 cv-qualified version of one of these types, or an array of one of the
2603 preceding types and is declared without an initializer (8.5). */
2604 tree type = TREE_TYPE (decl);
2606 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2607 || type == error_mark_node)
2610 type = strip_array_types (type);
2612 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2613 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2616 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2622 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2625 identify_goto (tree decl, const location_t *locus)
2628 permerror (input_location, "jump to label %qD", decl);
2630 permerror (input_location, "jump to case label");
2632 permerror (*locus, " from here");
2635 /* Check that a single previously seen jump to a newly defined label
2636 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2637 the jump context; NAMES are the names in scope in LEVEL at the jump
2638 context; LOCUS is the source position of the jump or 0. Returns
2639 true if all is well. */
2642 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2643 bool exited_omp, const location_t *locus)
2645 struct cp_binding_level *b;
2646 bool identified = false, saw_eh = false, saw_omp = false;
2650 identify_goto (decl, locus);
2651 error (" exits OpenMP structured block");
2652 identified = saw_omp = true;
2655 for (b = current_binding_level; b ; b = b->level_chain)
2657 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2659 for (new_decls = b->names; new_decls != old_decls;
2660 new_decls = DECL_CHAIN (new_decls))
2662 int problem = decl_jump_unsafe (new_decls);
2668 identify_goto (decl, locus);
2672 error (" crosses initialization of %q+#D", new_decls);
2674 permerror (input_location, " enters scope of %q+#D which has "
2675 "non-trivial destructor", new_decls);
2680 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2684 identify_goto (decl, locus);
2687 if (b->kind == sk_try)
2688 error (" enters try block");
2690 error (" enters catch block");
2693 if (b->kind == sk_omp && !saw_omp)
2697 identify_goto (decl, locus);
2700 error (" enters OpenMP structured block");
2709 check_previous_goto (tree decl, struct named_label_use_entry *use)
2711 check_previous_goto_1 (decl, use->binding_level,
2712 use->names_in_scope, use->in_omp_scope,
2713 &use->o_goto_locus);
2717 check_switch_goto (struct cp_binding_level* level)
2719 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2722 /* Check that a new jump to a label DECL is OK. Called by
2723 finish_goto_stmt. */
2726 check_goto (tree decl)
2728 struct named_label_entry *ent, dummy;
2729 bool saw_catch = false, identified = false;
2733 /* We can't know where a computed goto is jumping.
2734 So we assume that it's OK. */
2735 if (TREE_CODE (decl) != LABEL_DECL)
2738 /* We didn't record any information about this label when we created it,
2739 and there's not much point since it's trivial to analyze as a return. */
2740 if (decl == cdtor_label)
2743 dummy.label_decl = decl;
2744 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2745 gcc_assert (ent != NULL);
2747 /* If the label hasn't been defined yet, defer checking. */
2748 if (! DECL_INITIAL (decl))
2750 struct named_label_use_entry *new_use;
2752 /* Don't bother creating another use if the last goto had the
2753 same data, and will therefore create the same set of errors. */
2755 && ent->uses->names_in_scope == current_binding_level->names)
2758 new_use = ggc_alloc_named_label_use_entry ();
2759 new_use->binding_level = current_binding_level;
2760 new_use->names_in_scope = current_binding_level->names;
2761 new_use->o_goto_locus = input_location;
2762 new_use->in_omp_scope = false;
2764 new_use->next = ent->uses;
2765 ent->uses = new_use;
2769 if (ent->in_try_scope || ent->in_catch_scope
2770 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2772 permerror (input_location, "jump to label %q+D", decl);
2773 permerror (input_location, " from here");
2777 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2779 int u = decl_jump_unsafe (bad);
2781 if (u > 1 && DECL_ARTIFICIAL (bad))
2783 /* Can't skip init of __exception_info. */
2784 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2788 error (" skips initialization of %q+#D", bad);
2790 permerror (input_location, " enters scope of %q+#D which has "
2791 "non-trivial destructor", bad);
2794 if (ent->in_try_scope)
2795 error (" enters try block");
2796 else if (ent->in_catch_scope && !saw_catch)
2797 error (" enters catch block");
2799 if (ent->in_omp_scope)
2800 error (" enters OpenMP structured block");
2801 else if (flag_openmp)
2803 struct cp_binding_level *b;
2804 for (b = current_binding_level; b ; b = b->level_chain)
2806 if (b == ent->binding_level)
2808 if (b->kind == sk_omp)
2812 permerror (input_location, "jump to label %q+D", decl);
2813 permerror (input_location, " from here");
2816 error (" exits OpenMP structured block");
2823 /* Check that a return is ok wrt OpenMP structured blocks.
2824 Called by finish_return_stmt. Returns true if all is well. */
2827 check_omp_return (void)
2829 struct cp_binding_level *b;
2830 for (b = current_binding_level; b ; b = b->level_chain)
2831 if (b->kind == sk_omp)
2833 error ("invalid exit from OpenMP structured block");
2839 /* Define a label, specifying the location in the source file.
2840 Return the LABEL_DECL node for the label. */
2843 define_label_1 (location_t location, tree name)
2845 struct named_label_entry *ent, dummy;
2846 struct cp_binding_level *p;
2849 decl = lookup_label (name);
2851 dummy.label_decl = decl;
2852 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2853 gcc_assert (ent != NULL);
2855 /* After labels, make any new cleanups in the function go into their
2856 own new (temporary) binding contour. */
2857 for (p = current_binding_level;
2858 p->kind != sk_function_parms;
2860 p->more_cleanups_ok = 0;
2862 if (name == get_identifier ("wchar_t"))
2863 permerror (input_location, "label named wchar_t");
2865 if (DECL_INITIAL (decl) != NULL_TREE)
2867 error ("duplicate label %qD", decl);
2868 return error_mark_node;
2872 struct named_label_use_entry *use;
2874 /* Mark label as having been defined. */
2875 DECL_INITIAL (decl) = error_mark_node;
2876 /* Say where in the source. */
2877 DECL_SOURCE_LOCATION (decl) = location;
2879 ent->binding_level = current_binding_level;
2880 ent->names_in_scope = current_binding_level->names;
2882 for (use = ent->uses; use ; use = use->next)
2883 check_previous_goto (decl, use);
2890 /* Wrapper for define_label_1. */
2893 define_label (location_t location, tree name)
2896 timevar_start (TV_NAME_LOOKUP);
2897 ret = define_label_1 (location, name);
2898 timevar_stop (TV_NAME_LOOKUP);
2905 struct cp_binding_level *level;
2906 struct cp_switch *next;
2907 /* The SWITCH_STMT being built. */
2909 /* A splay-tree mapping the low element of a case range to the high
2910 element, or NULL_TREE if there is no high element. Used to
2911 determine whether or not a new case label duplicates an old case
2912 label. We need a tree, rather than simply a hash table, because
2913 of the GNU case range extension. */
2917 /* A stack of the currently active switch statements. The innermost
2918 switch statement is on the top of the stack. There is no need to
2919 mark the stack for garbage collection because it is only active
2920 during the processing of the body of a function, and we never
2921 collect at that point. */
2923 static struct cp_switch *switch_stack;
2925 /* Called right after a switch-statement condition is parsed.
2926 SWITCH_STMT is the switch statement being parsed. */
2929 push_switch (tree switch_stmt)
2931 struct cp_switch *p = XNEW (struct cp_switch);
2932 p->level = current_binding_level;
2933 p->next = switch_stack;
2934 p->switch_stmt = switch_stmt;
2935 p->cases = splay_tree_new (case_compare, NULL, NULL);
2942 struct cp_switch *cs = switch_stack;
2943 location_t switch_location;
2945 /* Emit warnings as needed. */
2946 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2947 if (!processing_template_decl)
2948 c_do_switch_warnings (cs->cases, switch_location,
2949 SWITCH_STMT_TYPE (cs->switch_stmt),
2950 SWITCH_STMT_COND (cs->switch_stmt));
2952 splay_tree_delete (cs->cases);
2953 switch_stack = switch_stack->next;
2957 /* Note that we've seen a definition of a case label, and complain if this
2958 is a bad place for one. */
2961 finish_case_label (location_t loc, tree low_value, tree high_value)
2964 struct cp_binding_level *p;
2966 if (processing_template_decl)
2970 /* For templates, just add the case label; we'll do semantic
2971 analysis at instantiation-time. */
2972 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2973 return add_stmt (build_case_label (low_value, high_value, label));
2976 /* Find the condition on which this switch statement depends. */
2977 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2978 if (cond && TREE_CODE (cond) == TREE_LIST)
2979 cond = TREE_VALUE (cond);
2981 if (!check_switch_goto (switch_stack->level))
2982 return error_mark_node;
2985 low_value = cxx_constant_value (low_value);
2987 high_value = cxx_constant_value (high_value);
2989 r = c_add_case_label (loc, switch_stack->cases, cond,
2990 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2991 low_value, high_value);
2993 /* After labels, make any new cleanups in the function go into their
2994 own new (temporary) binding contour. */
2995 for (p = current_binding_level;
2996 p->kind != sk_function_parms;
2998 p->more_cleanups_ok = 0;
3003 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3006 typename_hash (const void* k)
3009 const_tree const t = (const_tree) k;
3011 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3012 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3017 typedef struct typename_info {
3025 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3026 really of type `typename_info*' */
3029 typename_compare (const void * k1, const void * k2)
3031 const_tree const t1 = (const_tree) k1;
3032 const typename_info *const t2 = (const typename_info *) k2;
3034 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3035 && TYPE_CONTEXT (t1) == t2->scope
3036 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3037 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3038 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3041 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3042 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3044 Returns the new TYPENAME_TYPE. */
3046 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3049 build_typename_type (tree context, tree name, tree fullname,
3050 enum tag_types tag_type)
3058 if (typename_htab == NULL)
3059 typename_htab = htab_create_ggc (61, &typename_hash,
3060 &typename_compare, NULL);
3062 ti.scope = FROB_CONTEXT (context);
3064 ti.template_id = fullname;
3065 ti.enum_p = tag_type == enum_type;
3066 ti.class_p = (tag_type == class_type
3067 || tag_type == record_type
3068 || tag_type == union_type);
3069 hash = (htab_hash_pointer (ti.scope)
3070 ^ htab_hash_pointer (ti.name));
3072 /* See if we already have this type. */
3073 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3078 /* Build the TYPENAME_TYPE. */
3079 t = cxx_make_type (TYPENAME_TYPE);
3080 TYPE_CONTEXT (t) = ti.scope;
3081 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3082 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3083 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3085 /* Build the corresponding TYPE_DECL. */
3086 d = build_decl (input_location, TYPE_DECL, name, t);
3087 TYPE_NAME (TREE_TYPE (d)) = d;
3088 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3089 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3090 DECL_ARTIFICIAL (d) = 1;
3092 /* Store it in the hash table. */
3095 /* TYPENAME_TYPEs must always be compared structurally, because
3096 they may or may not resolve down to another type depending on
3097 the currently open classes. */
3098 SET_TYPE_STRUCTURAL_EQUALITY (t);
3104 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3105 provided to name the type. Returns an appropriate type, unless an
3106 error occurs, in which case error_mark_node is returned. If we
3107 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3108 return that, rather than the _TYPE it corresponds to, in other
3109 cases we look through the type decl. If TF_ERROR is set, complain
3110 about errors, otherwise be quiet. */
3113 make_typename_type (tree context, tree name, enum tag_types tag_type,
3114 tsubst_flags_t complain)
3120 if (name == error_mark_node
3121 || context == NULL_TREE
3122 || context == error_mark_node)
3123 return error_mark_node;
3127 if (!(TYPE_LANG_SPECIFIC (name)
3128 && (CLASSTYPE_IS_TEMPLATE (name)
3129 || CLASSTYPE_USE_TEMPLATE (name))))
3130 name = TYPE_IDENTIFIER (name);
3132 /* Create a TEMPLATE_ID_EXPR for the type. */
3133 name = build_nt (TEMPLATE_ID_EXPR,
3134 CLASSTYPE_TI_TEMPLATE (name),
3135 CLASSTYPE_TI_ARGS (name));
3137 else if (TREE_CODE (name) == TYPE_DECL)
3138 name = DECL_NAME (name);
3142 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3144 name = TREE_OPERAND (name, 0);
3145 if (TREE_CODE (name) == TEMPLATE_DECL)
3146 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3147 else if (TREE_CODE (name) == OVERLOAD)
3149 error ("%qD is not a type", name);
3150 return error_mark_node;
3153 if (TREE_CODE (name) == TEMPLATE_DECL)
3155 error ("%qD used without template parameters", name);
3156 return error_mark_node;
3158 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3159 gcc_assert (TYPE_P (context));
3161 if (!MAYBE_CLASS_TYPE_P (context))
3163 if (complain & tf_error)
3164 error ("%q#T is not a class", context);
3165 return error_mark_node;
3168 /* When the CONTEXT is a dependent type, NAME could refer to a
3169 dependent base class of CONTEXT. But look inside it anyway
3170 if CONTEXT is a currently open scope, in case it refers to a
3171 member of the current instantiation or a non-dependent base;
3172 lookup will stop when we hit a dependent base. */
3173 if (!dependent_scope_p (context))
3174 /* We should only set WANT_TYPE when we're a nested typename type.
3175 Then we can give better diagnostics if we find a non-type. */
3176 t = lookup_field (context, name, 2, /*want_type=*/true);
3180 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3181 return build_typename_type (context, name, fullname, tag_type);
3183 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3187 if (complain & tf_error)
3188 error (want_template ? "no class template named %q#T in %q#T"
3189 : "no type named %q#T in %q#T", name, context);
3190 return error_mark_node;
3193 /* Pull out the template from an injected-class-name (or multiple). */
3195 t = maybe_get_template_decl_from_type_decl (t);
3197 if (TREE_CODE (t) == TREE_LIST)
3199 if (complain & tf_error)
3201 error ("lookup of %qT in %qT is ambiguous", name, context);
3202 print_candidates (t);
3204 return error_mark_node;
3207 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3209 if (complain & tf_error)
3210 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3212 return error_mark_node;
3214 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3216 if (complain & tf_error)
3217 error ("%<typename %T::%D%> names %q#T, which is not a type",
3219 return error_mark_node;
3222 if (complain & tf_error)
3223 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3225 /* If we are currently parsing a template and if T is a typedef accessed
3226 through CONTEXT then we need to remember and check access of T at
3227 template instantiation time. */
3228 add_typedef_to_current_template_for_access_check (t, context, input_location);
3231 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3233 /*entering_scope=*/0,
3234 tf_warning_or_error | tf_user);
3236 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3242 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3243 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3244 in which case error_mark_node is returned.
3246 If PARM_LIST is non-NULL, also make sure that the template parameter
3247 list of TEMPLATE_DECL matches.
3249 If COMPLAIN zero, don't complain about any errors that occur. */
3252 make_unbound_class_template (tree context, tree name, tree parm_list,
3253 tsubst_flags_t complain)
3259 name = TYPE_IDENTIFIER (name);
3260 else if (DECL_P (name))
3261 name = DECL_NAME (name);
3262 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3264 if (!dependent_type_p (context)
3265 || currently_open_class (context))
3267 tree tmpl = NULL_TREE;
3269 if (MAYBE_CLASS_TYPE_P (context))
3270 tmpl = lookup_field (context, name, 0, false);
3272 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3273 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3275 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3277 if (complain & tf_error)
3278 error ("no class template named %q#T in %q#T", name, context);
3279 return error_mark_node;
3283 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3285 if (complain & tf_error)
3287 error ("template parameters do not match template");
3288 error ("%q+D declared here", tmpl);
3290 return error_mark_node;
3293 if (complain & tf_error)
3294 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3299 /* Build the UNBOUND_CLASS_TEMPLATE. */
3300 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3301 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3302 TREE_TYPE (t) = NULL_TREE;
3303 SET_TYPE_STRUCTURAL_EQUALITY (t);
3305 /* Build the corresponding TEMPLATE_DECL. */
3306 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3307 TYPE_NAME (TREE_TYPE (d)) = d;
3308 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3309 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3310 DECL_ARTIFICIAL (d) = 1;
3311 DECL_TEMPLATE_PARMS (d) = parm_list;
3318 /* Push the declarations of builtin types into the namespace.
3319 RID_INDEX is the index of the builtin type in the array
3320 RID_POINTERS. NAME is the name used when looking up the builtin
3321 type. TYPE is the _TYPE node for the builtin type. */
3324 record_builtin_type (enum rid rid_index,
3328 tree rname = NULL_TREE, tname = NULL_TREE;
3329 tree tdecl = NULL_TREE;
3331 if ((int) rid_index < (int) RID_MAX)
3332 rname = ridpointers[(int) rid_index];
3334 tname = get_identifier (name);
3336 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3337 eliminated. Built-in types should not be looked up name; their
3338 names are keywords that the parser can recognize. However, there
3339 is code in c-common.c that uses identifier_global_value to look
3340 up built-in types by name. */
3343 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3344 DECL_ARTIFICIAL (tdecl) = 1;
3345 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3351 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3352 DECL_ARTIFICIAL (tdecl) = 1;
3354 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3357 if (!TYPE_NAME (type))
3358 TYPE_NAME (type) = tdecl;
3361 debug_hooks->type_decl (tdecl, 0);
3364 /* Record one of the standard Java types.
3365 * Declare it as having the given NAME.
3366 * If SIZE > 0, it is the size of one of the integral types;
3367 * otherwise it is the negative of the size of one of the other types. */
3370 record_builtin_java_type (const char* name, int size)
3375 type = build_nonstandard_integer_type (size, 0);
3376 type = build_distinct_type_copy (type);
3378 else if (size > -32)
3381 /* "__java_char" or ""__java_boolean". */
3382 type = build_nonstandard_integer_type (-size, 1);
3383 type = build_distinct_type_copy (type);
3384 /* Get the signed type cached and attached to the unsigned type,
3385 so it doesn't get garbage-collected at "random" times,
3386 causing potential codegen differences out of different UIDs
3387 and different alias set numbers. */
3388 stype = build_nonstandard_integer_type (-size, 0);
3389 stype = build_distinct_type_copy (stype);
3390 TREE_CHAIN (type) = stype;
3391 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3394 { /* "__java_float" or ""__java_double". */
3395 type = make_node (REAL_TYPE);
3396 TYPE_PRECISION (type) = - size;
3399 record_builtin_type (RID_MAX, name, type);
3400 decl = TYPE_NAME (type);
3402 /* Suppress generate debug symbol entries for these types,
3403 since for normal C++ they are just clutter.
3404 However, push_lang_context undoes this if extern "Java" is seen. */
3405 DECL_IGNORED_P (decl) = 1;
3407 TYPE_FOR_JAVA (type) = 1;
3411 /* Push a type into the namespace so that the back ends ignore it. */
3414 record_unknown_type (tree type, const char* name)
3416 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3417 TYPE_DECL, get_identifier (name), type));
3418 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3419 DECL_IGNORED_P (decl) = 1;
3420 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3421 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3422 TYPE_ALIGN (type) = 1;
3423 TYPE_USER_ALIGN (type) = 0;
3424 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3427 /* A string for which we should create an IDENTIFIER_NODE at
3430 typedef struct predefined_identifier
3432 /* The name of the identifier. */
3433 const char *const name;
3434 /* The place where the IDENTIFIER_NODE should be stored. */
3436 /* Nonzero if this is the name of a constructor or destructor. */
3437 const int ctor_or_dtor_p;
3438 } predefined_identifier;
3440 /* Create all the predefined identifiers. */
3443 initialize_predefined_identifiers (void)
3445 const predefined_identifier *pid;
3447 /* A table of identifiers to create at startup. */
3448 static const predefined_identifier predefined_identifiers[] = {
3449 { "C++", &lang_name_cplusplus, 0 },
3450 { "C", &lang_name_c, 0 },
3451 { "Java", &lang_name_java, 0 },
3452 /* Some of these names have a trailing space so that it is
3453 impossible for them to conflict with names written by users. */
3454 { "__ct ", &ctor_identifier, 1 },
3455 { "__base_ctor ", &base_ctor_identifier, 1 },
3456 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3457 { "__dt ", &dtor_identifier, 1 },
3458 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3459 { "__base_dtor ", &base_dtor_identifier, 1 },
3460 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3461 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3462 { "nelts", &nelts_identifier, 0 },
3463 { THIS_NAME, &this_identifier, 0 },
3464 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3465 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3466 { "_vptr", &vptr_identifier, 0 },
3467 { "__vtt_parm", &vtt_parm_identifier, 0 },
3468 { "::", &global_scope_name, 0 },
3469 { "std", &std_identifier, 0 },
3473 for (pid = predefined_identifiers; pid->name; ++pid)
3475 *pid->node = get_identifier (pid->name);
3476 if (pid->ctor_or_dtor_p)
3477 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3481 /* Create the predefined scalar types of C,
3482 and some nodes representing standard constants (0, 1, (void *)0).
3483 Initialize the global binding level.
3484 Make definitions for built-in primitive functions. */
3487 cxx_init_decl_processing (void)
3490 tree void_ftype_ptr;
3492 build_common_tree_nodes (flag_signed_char);
3494 /* Create all the identifiers we need. */
3495 initialize_predefined_identifiers ();
3497 /* Create the global variables. */
3498 push_to_top_level ();
3500 current_function_decl = NULL_TREE;
3501 current_binding_level = NULL;
3502 /* Enter the global namespace. */
3503 gcc_assert (global_namespace == NULL_TREE);
3504 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3506 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3507 TREE_PUBLIC (global_namespace) = 1;
3508 begin_scope (sk_namespace, global_namespace);
3510 current_lang_name = NULL_TREE;
3512 if (flag_visibility_ms_compat)
3513 default_visibility = VISIBILITY_HIDDEN;
3516 current_lang_name = lang_name_c;
3518 /* Create the `std' namespace. */
3519 push_namespace (std_identifier);
3520 std_node = current_namespace;
3523 c_common_nodes_and_builtins ();
3525 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3526 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3527 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3528 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3529 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3530 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3531 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3532 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3534 integer_two_node = build_int_cst (NULL_TREE, 2);
3536 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3537 truthvalue_type_node = boolean_type_node;
3538 truthvalue_false_node = boolean_false_node;
3539 truthvalue_true_node = boolean_true_node;
3541 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3542 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3543 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3546 record_builtin_type (RID_MAX, NULL, string_type_node);
3549 delta_type_node = ptrdiff_type_node;
3550 vtable_index_type = ptrdiff_type_node;
3552 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3553 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3554 void_ftype_ptr = build_function_type_list (void_type_node,
3555 ptr_type_node, NULL_TREE);
3557 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3559 /* C++ extensions */
3561 unknown_type_node = make_node (LANG_TYPE);
3562 record_unknown_type (unknown_type_node, "unknown type");
3564 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3565 TREE_TYPE (unknown_type_node) = unknown_type_node;
3567 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3569 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3570 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3572 init_list_type_node = make_node (LANG_TYPE);
3573 record_unknown_type (init_list_type_node, "init list");
3576 /* Make sure we get a unique function type, so we can give
3577 its pointer type a name. (This wins for gdb.) */
3578 tree vfunc_type = make_node (FUNCTION_TYPE);
3579 TREE_TYPE (vfunc_type) = integer_type_node;
3580 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3581 layout_type (vfunc_type);
3583 vtable_entry_type = build_pointer_type (vfunc_type);
3585 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3588 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3589 layout_type (vtbl_type_node);
3590 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3591 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3592 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3593 layout_type (vtbl_ptr_type_node);
3594 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3596 push_namespace (get_identifier ("__cxxabiv1"));
3597 abi_node = current_namespace;
3600 global_type_node = make_node (LANG_TYPE);
3601 record_unknown_type (global_type_node, "global type");
3604 current_lang_name = lang_name_cplusplus;
3607 tree newtype, deltype;
3608 tree ptr_ftype_sizetype;
3612 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3613 if (cxx_dialect == cxx98)
3616 tree bad_alloc_type_node;
3617 tree bad_alloc_decl;
3619 push_namespace (std_identifier);
3620 bad_alloc_id = get_identifier ("bad_alloc");
3621 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3622 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3624 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3625 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3629 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3632 new_eh_spec = noexcept_false_spec;
3634 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3635 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3636 push_cp_library_fn (NEW_EXPR, newtype);
3637 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3638 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3639 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3641 nullptr_type_node = make_node (NULLPTR_TYPE);
3642 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3643 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3644 TYPE_UNSIGNED (nullptr_type_node) = 1;
3645 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3646 SET_TYPE_MODE (nullptr_type_node, Pmode);
3647 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3648 nullptr_node = build_int_cst (nullptr_type_node, 0);
3652 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3654 /* Perform other language dependent initializations. */
3655 init_class_processing ();
3656 init_rtti_processing ();
3657 init_template_processing ();
3659 if (flag_exceptions)
3660 init_exception_processing ();
3662 if (! supports_one_only ())
3665 make_fname_decl = cp_make_fname_decl;
3666 start_fname_decls ();
3668 /* Show we use EH for cleanups. */
3669 if (flag_exceptions)
3670 using_eh_for_cleanups ();
3673 /* Generate an initializer for a function naming variable from
3674 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3675 filled in with the type of the init. */
3678 cp_fname_init (const char* name, tree *type_p)
3680 tree domain = NULL_TREE;
3682 tree init = NULL_TREE;
3687 length = strlen (name);
3688 domain = build_index_type (size_int (length));
3689 init = build_string (length + 1, name);
3692 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3693 type = build_cplus_array_type (type, domain);
3698 TREE_TYPE (init) = type;
3700 init = error_mark_node;
3705 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3706 the decl, LOC is the location to give the decl, NAME is the
3707 initialization string and TYPE_DEP indicates whether NAME depended
3708 on the type of the function. We make use of that to detect
3709 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3710 at the point of first use, so we mustn't push the decl now. */
3713 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3715 const char *const name = (type_dep && processing_template_decl
3716 ? NULL : fname_as_string (type_dep));
3718 tree init = cp_fname_init (name, &type);
3719 tree decl = build_decl (loc, VAR_DECL, id, type);
3722 free (CONST_CAST (char *, name));
3724 /* As we're using pushdecl_with_scope, we must set the context. */
3725 DECL_CONTEXT (decl) = current_function_decl;
3726 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3728 TREE_STATIC (decl) = 1;
3729 TREE_READONLY (decl) = 1;
3730 DECL_ARTIFICIAL (decl) = 1;
3732 TREE_USED (decl) = 1;
3734 if (current_function_decl)
3736 struct cp_binding_level *b = current_binding_level;
3737 if (b->kind == sk_function_parms)
3738 return error_mark_node;
3739 while (b->level_chain->kind != sk_function_parms)
3741 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3742 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3743 LOOKUP_ONLYCONVERTING);
3747 DECL_THIS_STATIC (decl) = true;
3748 pushdecl_top_level_and_finish (decl, init);
3755 builtin_function_1 (tree decl, tree context, bool is_global)
3757 tree id = DECL_NAME (decl);
3758 const char *name = IDENTIFIER_POINTER (id);
3760 retrofit_lang_decl (decl);
3762 DECL_ARTIFICIAL (decl) = 1;
3763 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3764 SET_DECL_LANGUAGE (decl, lang_c);
3765 /* Runtime library routines are, by definition, available in an
3766 external shared object. */
3767 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3768 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3770 DECL_CONTEXT (decl) = context;
3773 pushdecl_top_level (decl);
3777 /* A function in the user's namespace should have an explicit
3778 declaration before it is used. Mark the built-in function as
3779 anticipated but not actually declared. */
3780 if (name[0] != '_' || name[1] != '_')
3781 DECL_ANTICIPATED (decl) = 1;
3782 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3784 size_t len = strlen (name);
3786 /* Treat __*_chk fortification functions as anticipated as well,
3787 unless they are __builtin_*. */
3788 if (len > strlen ("___chk")
3789 && memcmp (name + len - strlen ("_chk"),
3790 "_chk", strlen ("_chk") + 1) == 0)
3791 DECL_ANTICIPATED (decl) = 1;
3798 cxx_builtin_function (tree decl)
3800 tree id = DECL_NAME (decl);
3801 const char *name = IDENTIFIER_POINTER (id);
3802 /* All builtins that don't begin with an '_' should additionally
3803 go in the 'std' namespace. */
3806 tree decl2 = copy_node(decl);
3807 push_namespace (std_identifier);
3808 builtin_function_1 (decl2, std_node, false);
3812 return builtin_function_1 (decl, NULL_TREE, false);
3815 /* Like cxx_builtin_function, but guarantee the function is added to the global
3816 scope. This is to allow function specific options to add new machine
3817 dependent builtins when the target ISA changes via attribute((target(...)))
3818 which saves space on program startup if the program does not use non-generic
3822 cxx_builtin_function_ext_scope (tree decl)
3825 tree id = DECL_NAME (decl);
3826 const char *name = IDENTIFIER_POINTER (id);
3827 /* All builtins that don't begin with an '_' should additionally
3828 go in the 'std' namespace. */
3831 tree decl2 = copy_node(decl);
3832 push_namespace (std_identifier);
3833 builtin_function_1 (decl2, std_node, true);
3837 return builtin_function_1 (decl, NULL_TREE, true);
3840 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3841 function. Not called directly. */
3844 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3846 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3847 DECL_EXTERNAL (fn) = 1;
3848 TREE_PUBLIC (fn) = 1;
3849 DECL_ARTIFICIAL (fn) = 1;
3850 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3851 SET_DECL_LANGUAGE (fn, lang_c);
3852 /* Runtime library routines are, by definition, available in an
3853 external shared object. */
3854 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3855 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3859 /* Returns the _DECL for a library function with C linkage.
3860 We assume that such functions never throw; if this is incorrect,
3861 callers should unset TREE_NOTHROW. */
3864 build_library_fn (tree name, tree type)
3866 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3867 TREE_NOTHROW (fn) = 1;
3871 /* Returns the _DECL for a library function with C++ linkage. */
3874 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3876 tree fn = build_library_fn_1 (name, operator_code, type);
3877 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3878 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3879 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3883 /* Like build_library_fn, but takes a C string instead of an
3887 build_library_fn_ptr (const char* name, tree type)
3889 return build_library_fn (get_identifier (name), type);
3892 /* Like build_cp_library_fn, but takes a C string instead of an
3896 build_cp_library_fn_ptr (const char* name, tree type)
3898 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3901 /* Like build_library_fn, but also pushes the function so that we will
3902 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3903 may throw exceptions listed in RAISES. */
3906 push_library_fn (tree name, tree type, tree raises)
3911 type = build_exception_variant (type, raises);
3913 fn = build_library_fn (name, type);
3914 pushdecl_top_level (fn);
3918 /* Like build_cp_library_fn, but also pushes the function so that it
3919 will be found by normal lookup. */
3922 push_cp_library_fn (enum tree_code operator_code, tree type)
3924 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3931 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3935 push_void_library_fn (tree name, tree parmtypes)
3937 tree type = build_function_type (void_type_node, parmtypes);
3938 return push_library_fn (name, type, NULL_TREE);
3941 /* Like push_library_fn, but also note that this function throws
3942 and does not return. Used for __throw_foo and the like. */
3945 push_throw_library_fn (tree name, tree type)
3947 tree fn = push_library_fn (name, type, NULL_TREE);
3948 TREE_THIS_VOLATILE (fn) = 1;
3949 TREE_NOTHROW (fn) = 0;
3953 /* When we call finish_struct for an anonymous union, we create
3954 default copy constructors and such. But, an anonymous union
3955 shouldn't have such things; this function undoes the damage to the
3956 anonymous union type T.
3958 (The reason that we create the synthesized methods is that we don't
3959 distinguish `union { int i; }' from `typedef union { int i; } U'.
3960 The first is an anonymous union; the second is just an ordinary
3964 fixup_anonymous_aggr (tree t)
3968 /* Wipe out memory of synthesized methods. */
3969 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3970 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3971 TYPE_HAS_COPY_CTOR (t) = 0;
3972 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3973 TYPE_HAS_COPY_ASSIGN (t) = 0;
3974 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3976 /* Splice the implicitly generated functions out of the TYPE_METHODS
3978 q = &TYPE_METHODS (t);
3981 if (DECL_ARTIFICIAL (*q))
3982 *q = TREE_CHAIN (*q);
3984 q = &DECL_CHAIN (*q);
3987 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3988 if (TYPE_METHODS (t))
3990 tree decl = TYPE_MAIN_DECL (t);
3992 if (TREE_CODE (t) != UNION_TYPE)
3993 error_at (DECL_SOURCE_LOCATION (decl),
3994 "an anonymous struct cannot have function members");
3996 error_at (DECL_SOURCE_LOCATION (decl),
3997 "an anonymous union cannot have function members");
4000 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4001 assignment operators (because they cannot have these methods themselves).
4002 For anonymous unions this is already checked because they are not allowed
4003 in any union, otherwise we have to check it. */
4004 if (TREE_CODE (t) != UNION_TYPE)
4008 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4009 if (TREE_CODE (field) == FIELD_DECL)
4011 type = TREE_TYPE (field);
4012 if (CLASS_TYPE_P (type))
4014 if (TYPE_NEEDS_CONSTRUCTING (type))
4015 error ("member %q+#D with constructor not allowed "
4016 "in anonymous aggregate", field);
4017 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4018 error ("member %q+#D with destructor not allowed "
4019 "in anonymous aggregate", field);
4020 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4021 error ("member %q+#D with copy assignment operator "
4022 "not allowed in anonymous aggregate", field);
4028 /* Make sure that a declaration with no declarator is well-formed, i.e.
4029 just declares a tagged type or anonymous union.
4031 Returns the type declared; or NULL_TREE if none. */
4034 check_tag_decl (cp_decl_specifier_seq *declspecs)
4036 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4037 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4038 /* If a class, struct, or enum type is declared by the DECLSPECS
4039 (i.e, if a class-specifier, enum-specifier, or non-typename
4040 elaborated-type-specifier appears in the DECLSPECS),
4041 DECLARED_TYPE is set to the corresponding type. */
4042 tree declared_type = NULL_TREE;
4043 bool error_p = false;
4045 if (declspecs->multiple_types_p)
4046 error ("multiple types in one declaration");
4047 else if (declspecs->redefined_builtin_type)
4049 if (!in_system_header)
4050 permerror (input_location, "redeclaration of C++ built-in type %qT",
4051 declspecs->redefined_builtin_type);
4056 && TYPE_P (declspecs->type)
4057 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4058 && MAYBE_CLASS_TYPE_P (declspecs->type))
4059 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4060 declared_type = declspecs->type;
4061 else if (declspecs->type == error_mark_node)
4063 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4064 permerror (input_location, "declaration does not declare anything");
4065 /* Check for an anonymous union. */
4066 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4067 && TYPE_ANONYMOUS_P (declared_type))
4069 /* 7/3 In a simple-declaration, the optional init-declarator-list
4070 can be omitted only when declaring a class (clause 9) or
4071 enumeration (7.2), that is, when the decl-specifier-seq contains
4072 either a class-specifier, an elaborated-type-specifier with
4073 a class-key (9.1), or an enum-specifier. In these cases and
4074 whenever a class-specifier or enum-specifier is present in the
4075 decl-specifier-seq, the identifiers in these specifiers are among
4076 the names being declared by the declaration (as class-name,
4077 enum-names, or enumerators, depending on the syntax). In such
4078 cases, and except for the declaration of an unnamed bit-field (9.6),
4079 the decl-specifier-seq shall introduce one or more names into the
4080 program, or shall redeclare a name introduced by a previous
4081 declaration. [Example:
4082 enum { }; // ill-formed
4083 typedef class { }; // ill-formed
4087 error ("missing type-name in typedef-declaration");
4090 /* Anonymous unions are objects, so they can have specifiers. */;
4091 SET_ANON_AGGR_TYPE_P (declared_type);
4093 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4094 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4099 if (declspecs->specs[(int)ds_inline]
4100 || declspecs->specs[(int)ds_virtual])
4101 error ("%qs can only be specified for functions",
4102 declspecs->specs[(int)ds_inline]
4103 ? "inline" : "virtual");
4105 && (!current_class_type
4106 || current_scope () != current_class_type))
4107 error ("%<friend%> can only be specified inside a class");
4108 else if (declspecs->specs[(int)ds_explicit])
4109 error ("%<explicit%> can only be specified for constructors");
4110 else if (declspecs->storage_class)
4111 error ("a storage class can only be specified for objects "
4113 else if (declspecs->specs[(int)ds_const]
4114 || declspecs->specs[(int)ds_volatile]
4115 || declspecs->specs[(int)ds_restrict]
4116 || declspecs->specs[(int)ds_thread])
4117 error ("qualifiers can only be specified for objects "
4119 else if (saw_typedef)
4120 warning (0, "%<typedef%> was ignored in this declaration");
4121 else if (declspecs->specs[(int) ds_constexpr])
4122 error ("%<constexpr%> cannot be used for type declarations");
4125 return declared_type;
4128 /* Called when a declaration is seen that contains no names to declare.
4129 If its type is a reference to a structure, union or enum inherited
4130 from a containing scope, shadow that tag name for the current scope
4131 with a forward reference.
4132 If its type defines a new named structure or union
4133 or defines an enum, it is valid but we need not do anything here.
4134 Otherwise, it is an error.
4136 C++: may have to grok the declspecs to learn about static,
4137 complain for anonymous unions.
4139 Returns the TYPE declared -- or NULL_TREE if none. */
4142 shadow_tag (cp_decl_specifier_seq *declspecs)
4144 tree t = check_tag_decl (declspecs);
4149 if (declspecs->attributes)
4151 warning (0, "attribute ignored in declaration of %q+#T", t);
4152 warning (0, "attribute for %q+#T must follow the %qs keyword",
4153 t, class_key_or_enum_as_string (t));
4157 if (maybe_process_partial_specialization (t) == error_mark_node)
4160 /* This is where the variables in an anonymous union are
4161 declared. An anonymous union declaration looks like:
4163 because there is no declarator after the union, the parser
4164 sends that declaration here. */
4165 if (ANON_AGGR_TYPE_P (t))
4167 fixup_anonymous_aggr (t);
4169 if (TYPE_FIELDS (t))
4171 tree decl = grokdeclarator (/*declarator=*/NULL,
4172 declspecs, NORMAL, 0, NULL);
4173 finish_anon_union (decl);
4180 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4183 groktypename (cp_decl_specifier_seq *type_specifiers,
4184 const cp_declarator *declarator,
4185 bool is_template_arg)
4189 enum decl_context context
4190 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4191 attrs = type_specifiers->attributes;
4192 type_specifiers->attributes = NULL_TREE;
4193 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4194 if (attrs && type != error_mark_node)
4196 if (CLASS_TYPE_P (type))
4197 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4198 "outside of definition", type);
4199 else if (MAYBE_CLASS_TYPE_P (type))
4200 /* A template type parameter or other dependent type. */
4201 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4202 "type %qT without an associated declaration", type);
4204 cplus_decl_attributes (&type, attrs, 0);
4209 /* Process a DECLARATOR for a function-scope variable declaration,
4210 namespace-scope variable declaration, or function declaration.
4211 (Function definitions go through start_function; class member
4212 declarations appearing in the body of the class go through
4213 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4214 If an error occurs, the error_mark_node is returned instead.
4216 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4217 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4218 for an explicitly defaulted function, or SD_DELETED for an explicitly
4219 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4220 implicitly initialized via a default constructor. ATTRIBUTES and
4221 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4222 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4223 set, the caller is responsible for calling pop_scope. */
4226 start_decl (const cp_declarator *declarator,
4227 cp_decl_specifier_seq *declspecs,
4230 tree prefix_attributes,
4231 tree *pushed_scope_p)
4239 *pushed_scope_p = NULL_TREE;
4241 /* An object declared as __attribute__((deprecated)) suppresses
4242 warnings of uses of other deprecated items. */
4243 if (lookup_attribute ("deprecated", attributes))
4244 deprecated_state = DEPRECATED_SUPPRESS;
4246 attributes = chainon (attributes, prefix_attributes);
4248 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4251 deprecated_state = DEPRECATED_NORMAL;
4253 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4254 || decl == error_mark_node)
4255 return error_mark_node;
4257 context = CP_DECL_CONTEXT (decl);
4258 if (context != global_namespace)
4259 *pushed_scope_p = push_scope (context);
4262 /* Is it valid for this decl to have an initializer at all?
4263 If not, set INITIALIZED to zero, which will indirectly
4264 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4265 switch (TREE_CODE (decl))
4268 error ("typedef %qD is initialized (use decltype instead)", decl);
4269 return error_mark_node;
4272 if (initialized == SD_DELETED)
4273 /* We'll handle the rest of the semantics later, but we need to
4274 set this now so it's visible to duplicate_decls. */
4275 DECL_DELETED_FN (decl) = 1;
4284 if (! toplevel_bindings_p ()
4285 && DECL_EXTERNAL (decl))
4286 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4288 DECL_EXTERNAL (decl) = 0;
4289 if (toplevel_bindings_p ())
4290 TREE_STATIC (decl) = 1;
4292 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4294 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4295 record_key_method_defined (decl);
4297 /* If this is a typedef that names the class for linkage purposes
4298 (7.1.3p8), apply any attributes directly to the type. */
4299 if (TREE_CODE (decl) == TYPE_DECL
4300 && TAGGED_TYPE_P (TREE_TYPE (decl))
4301 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4302 flags = ATTR_FLAG_TYPE_IN_PLACE;
4306 /* Set attributes here so if duplicate decl, will have proper attributes. */
4307 cplus_decl_attributes (&decl, attributes, flags);
4309 /* Dllimported symbols cannot be defined. Static data members (which
4310 can be initialized in-class and dllimported) go through grokfield,
4311 not here, so we don't need to exclude those decls when checking for
4313 if (initialized && DECL_DLLIMPORT_P (decl))
4315 error ("definition of %q#D is marked %<dllimport%>", decl);
4316 DECL_DLLIMPORT_P (decl) = 0;
4319 /* If #pragma weak was used, mark the decl weak now. */
4320 maybe_apply_pragma_weak (decl);
4322 if (TREE_CODE (decl) == FUNCTION_DECL
4323 && DECL_DECLARED_INLINE_P (decl)
4324 && DECL_UNINLINABLE (decl)
4325 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4326 warning (0, "inline function %q+D given attribute noinline", decl);
4328 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4330 if (TREE_CODE (decl) == VAR_DECL)
4332 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4333 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4334 error ("%q#D is not a static member of %q#T", decl, context);
4337 if (DECL_CONTEXT (field) != context)
4339 if (!same_type_p (DECL_CONTEXT (field), context))
4340 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4341 "to be defined as %<%T::%D%>",
4342 DECL_CONTEXT (field), DECL_NAME (decl),
4343 context, DECL_NAME (decl));
4344 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4346 if (processing_specialization
4347 && template_class_depth (context) == 0
4348 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4349 error ("template header not allowed in member definition "
4350 "of explicitly specialized class");
4351 /* Static data member are tricky; an in-class initialization
4352 still doesn't provide a definition, so the in-class
4353 declaration will have DECL_EXTERNAL set, but will have an
4354 initialization. Thus, duplicate_decls won't warn
4355 about this situation, and so we check here. */
4356 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4357 error ("duplicate initialization of %qD", decl);
4358 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4360 if (declspecs->specs[(int) ds_constexpr]
4361 && !DECL_DECLARED_CONSTEXPR_P (field))
4362 error ("%qD declared %<constexpr%> outside its class", field);
4367 tree field = check_classfn (context, decl,
4368 (processing_template_decl
4369 > template_class_depth (context))
4370 ? current_template_parms
4372 if (field && field != error_mark_node
4373 && duplicate_decls (decl, field,
4374 /*newdecl_is_friend=*/false))
4378 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4379 DECL_IN_AGGR_P (decl) = 0;
4380 /* Do not mark DECL as an explicit specialization if it was not
4381 already marked as an instantiation; a declaration should
4382 never be marked as a specialization unless we know what
4383 template is being specialized. */
4384 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4386 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4388 /* [temp.expl.spec] An explicit specialization of a static data
4389 member of a template is a definition if the declaration
4390 includes an initializer; otherwise, it is a declaration.
4392 We check for processing_specialization so this only applies
4393 to the new specialization syntax. */
4394 if (!initialized && processing_specialization)
4395 DECL_EXTERNAL (decl) = 1;
4398 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4399 /* Aliases are definitions. */
4401 permerror (input_location, "declaration of %q#D outside of class is not definition",
4405 was_public = TREE_PUBLIC (decl);
4407 /* Enter this declaration into the symbol table. */
4408 decl = maybe_push_decl (decl);
4410 if (processing_template_decl)
4411 decl = push_template_decl (decl);
4412 if (decl == error_mark_node)
4413 return error_mark_node;
4415 /* Tell the back end to use or not use .common as appropriate. If we say
4416 -fconserve-space, we want this to save .data space, at the expense of
4417 wrong semantics. If we say -fno-conserve-space, we want this to
4418 produce errors about redefs; to do this we force variables into the
4420 if (flag_conserve_space
4421 && TREE_CODE (decl) == VAR_DECL
4422 && TREE_PUBLIC (decl)
4423 && !DECL_THREAD_LOCAL_P (decl)
4424 && !have_global_bss_p ())
4425 DECL_COMMON (decl) = 1;
4427 if (TREE_CODE (decl) == VAR_DECL
4428 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4429 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4431 /* This is a const variable with implicit 'static'. Set
4432 DECL_THIS_STATIC so we can tell it from variables that are
4433 !TREE_PUBLIC because of the anonymous namespace. */
4434 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4435 DECL_THIS_STATIC (decl) = 1;
4438 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4439 start_decl_1 (decl, initialized);
4444 /* Process the declaration of a variable DECL. INITIALIZED is true
4445 iff DECL is explicitly initialized. (INITIALIZED is false if the
4446 variable is initialized via an implicitly-called constructor.)
4447 This function must be called for ordinary variables (including, for
4448 example, implicit instantiations of templates), but must not be
4449 called for template declarations. */
4452 start_decl_1 (tree decl, bool initialized)
4456 bool aggregate_definition_p;
4458 gcc_assert (!processing_template_decl);
4460 if (error_operand_p (decl))
4463 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4465 type = TREE_TYPE (decl);
4466 complete_p = COMPLETE_TYPE_P (type);
4467 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4469 /* If an explicit initializer is present, or if this is a definition
4470 of an aggregate, then we need a complete type at this point.
4471 (Scalars are always complete types, so there is nothing to
4472 check.) This code just sets COMPLETE_P; errors (if necessary)
4473 are issued below. */
4474 if ((initialized || aggregate_definition_p)
4476 && COMPLETE_TYPE_P (complete_type (type)))
4479 /* We will not yet have set TREE_READONLY on DECL if the type
4480 was "const", but incomplete, before this point. But, now, we
4481 have a complete type, so we can try again. */
4482 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4486 /* Is it valid for this decl to have an initializer at all? */
4488 /* Don't allow initializations for incomplete types except for
4489 arrays which might be completed by the initialization. */
4491 ; /* A complete type is ok. */
4492 else if (type_uses_auto (type))
4493 ; /* An auto type is ok. */
4494 else if (TREE_CODE (type) != ARRAY_TYPE)
4496 error ("variable %q#D has initializer but incomplete type", decl);
4497 type = TREE_TYPE (decl) = error_mark_node;
4499 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4501 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4502 error ("elements of array %q#D have incomplete type", decl);
4503 /* else we already gave an error in start_decl. */
4506 else if (aggregate_definition_p && !complete_p)
4508 if (type_uses_auto (type))
4509 error ("declaration of %q#D has no initializer", decl);
4511 error ("aggregate %q#D has incomplete type and cannot be defined",
4513 /* Change the type so that assemble_variable will give
4514 DECL an rtl we can live with: (mem (const_int 0)). */
4515 type = TREE_TYPE (decl) = error_mark_node;
4518 /* Create a new scope to hold this declaration if necessary.
4519 Whether or not a new scope is necessary cannot be determined
4520 until after the type has been completed; if the type is a
4521 specialization of a class template it is not until after
4522 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4523 will be set correctly. */
4524 maybe_push_cleanup_level (type);
4527 /* Handle initialization of references. DECL, TYPE, and INIT have the
4528 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4529 but will be set to a new CLEANUP_STMT if a temporary is created
4530 that must be destroyed subsequently.
4532 Returns an initializer expression to use to initialize DECL, or
4533 NULL if the initialization can be performed statically.
4535 Quotes on semantics can be found in ARM 8.4.3. */
4538 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4542 if (init == NULL_TREE)
4544 if ((DECL_LANG_SPECIFIC (decl) == 0
4545 || DECL_IN_AGGR_P (decl) == 0)
4546 && ! DECL_THIS_EXTERN (decl))
4547 error ("%qD declared as reference but not initialized", decl);
4551 if (TREE_CODE (init) == TREE_LIST)
4552 init = build_x_compound_expr_from_list (init, ELK_INIT,
4553 tf_warning_or_error);
4555 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4556 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4557 /* Note: default conversion is only called in very special cases. */
4558 init = decay_conversion (init);
4560 /* Convert INIT to the reference type TYPE. This may involve the
4561 creation of a temporary, whose lifetime must be the same as that
4562 of the reference. If so, a DECL_EXPR for the temporary will be
4563 added just after the DECL_EXPR for DECL. That's why we don't set
4564 DECL_INITIAL for local references (instead assigning to them
4565 explicitly); we need to allow the temporary to be initialized
4567 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4569 if (tmp == error_mark_node)
4571 else if (tmp == NULL_TREE)
4573 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4577 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4580 DECL_INITIAL (decl) = tmp;
4585 /* Subroutine of check_initializer. We're initializing a DECL of
4586 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4587 extend the lifetime of the underlying array to match that of the decl,
4588 just like for reference initialization. CLEANUP is as for
4589 grok_reference_init. */
4592 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4595 tree aggr_init, array, arrtype;
4596 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4597 if (error_operand_p (init))
4598 return error_mark_node;
4600 aggr_init = TARGET_EXPR_INITIAL (init);
4601 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4602 arrtype = TREE_TYPE (array);
4604 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4605 array = TREE_OPERAND (array, 0);
4606 /* If the array is constant, finish_compound_literal already made it a
4607 static variable and we don't need to do anything here. */
4608 if (decl && TREE_CODE (array) == TARGET_EXPR)
4610 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4611 var = build_address (var);
4612 var = convert (arrtype, var);
4613 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4618 /* Designated initializers in arrays are not supported in GNU C++.
4619 The parser cannot detect this error since it does not know whether
4620 a given brace-enclosed initializer is for a class type or for an
4621 array. This function checks that CE does not use a designated
4622 initializer. If it does, an error is issued. Returns true if CE
4623 is valid, i.e., does not have a designated initializer. */
4626 check_array_designated_initializer (const constructor_elt *ce)
4628 /* Designated initializers for array elements are not supported. */
4631 /* The parser only allows identifiers as designated
4633 if (ce->index == error_mark_node)
4634 error ("name used in a GNU-style designated "
4635 "initializer for an array");
4636 else if (TREE_CODE (ce->index) == INTEGER_CST)
4637 /* An index added by reshape_init. */
4641 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4642 error ("name %qD used in a GNU-style designated "
4643 "initializer for an array", ce->index);
4651 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4652 array until we finish parsing the initializer. If that's the
4653 situation we're in, update DECL accordingly. */
4656 maybe_deduce_size_from_array_init (tree decl, tree init)
4658 tree type = TREE_TYPE (decl);
4660 if (TREE_CODE (type) == ARRAY_TYPE
4661 && TYPE_DOMAIN (type) == NULL_TREE
4662 && TREE_CODE (decl) != TYPE_DECL)
4664 /* do_default is really a C-ism to deal with tentative definitions.
4665 But let's leave it here to ease the eventual merge. */
4666 int do_default = !DECL_EXTERNAL (decl);
4667 tree initializer = init ? init : DECL_INITIAL (decl);
4670 /* Check that there are no designated initializers in INIT, as
4671 those are not supported in GNU C++, and as the middle-end
4672 will crash if presented with a non-numeric designated
4674 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4676 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4677 constructor_elt *ce;
4679 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4680 if (!check_array_designated_initializer (ce))
4686 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4690 error ("initializer fails to determine size of %qD", decl);
4691 TREE_TYPE (decl) = error_mark_node;
4693 else if (failure == 2)
4697 error ("array size missing in %qD", decl);
4698 TREE_TYPE (decl) = error_mark_node;
4700 /* If a `static' var's size isn't known, make it extern as
4701 well as static, so it does not get allocated. If it's not
4702 `static', then don't mark it extern; finish_incomplete_decl
4703 will give it a default size and it will get allocated. */
4704 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4705 DECL_EXTERNAL (decl) = 1;
4707 else if (failure == 3)
4709 error ("zero-size array %qD", decl);
4710 TREE_TYPE (decl) = error_mark_node;
4714 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4716 relayout_decl (decl);
4720 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4721 any appropriate error messages regarding the layout. */
4724 layout_var_decl (tree decl)
4728 type = TREE_TYPE (decl);
4729 if (type == error_mark_node)
4732 /* If we haven't already layed out this declaration, do so now.
4733 Note that we must not call complete type for an external object
4734 because it's type might involve templates that we are not
4735 supposed to instantiate yet. (And it's perfectly valid to say
4736 `extern X x' for some incomplete type `X'.) */
4737 if (!DECL_EXTERNAL (decl))
4738 complete_type (type);
4739 if (!DECL_SIZE (decl)
4740 && TREE_TYPE (decl) != error_mark_node
4741 && (COMPLETE_TYPE_P (type)
4742 || (TREE_CODE (type) == ARRAY_TYPE
4743 && !TYPE_DOMAIN (type)
4744 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4745 layout_decl (decl, 0);
4747 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4749 /* An automatic variable with an incomplete type: that is an error.
4750 Don't talk about array types here, since we took care of that
4751 message in grokdeclarator. */
4752 error ("storage size of %qD isn%'t known", decl);
4753 TREE_TYPE (decl) = error_mark_node;
4756 /* Keep this code around in case we later want to control debug info
4757 based on whether a type is "used". (jason 1999-11-11) */
4759 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4760 /* Let debugger know it should output info for this type. */
4761 note_debug_info_needed (ttype);
4763 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4764 note_debug_info_needed (DECL_CONTEXT (decl));
4767 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4768 && DECL_SIZE (decl) != NULL_TREE
4769 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4771 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4772 constant_expression_warning (DECL_SIZE (decl));
4775 error ("storage size of %qD isn%'t constant", decl);
4776 TREE_TYPE (decl) = error_mark_node;
4781 /* If a local static variable is declared in an inline function, or if
4782 we have a weak definition, we must endeavor to create only one
4783 instance of the variable at link-time. */
4786 maybe_commonize_var (tree decl)
4788 /* Static data in a function with comdat linkage also has comdat
4790 if (TREE_STATIC (decl)
4791 /* Don't mess with __FUNCTION__. */
4792 && ! DECL_ARTIFICIAL (decl)
4793 && DECL_FUNCTION_SCOPE_P (decl)
4794 && vague_linkage_p (DECL_CONTEXT (decl)))
4798 /* With weak symbols, we simply make the variable COMDAT;
4799 that will cause copies in multiple translations units to
4801 comdat_linkage (decl);
4805 if (DECL_INITIAL (decl) == NULL_TREE
4806 || DECL_INITIAL (decl) == error_mark_node)
4808 /* Without weak symbols, we can use COMMON to merge
4809 uninitialized variables. */
4810 TREE_PUBLIC (decl) = 1;
4811 DECL_COMMON (decl) = 1;
4815 /* While for initialized variables, we must use internal
4816 linkage -- which means that multiple copies will not
4818 TREE_PUBLIC (decl) = 0;
4819 DECL_COMMON (decl) = 0;
4820 warning_at (input_location, 0,
4821 "sorry: semantics of inline function static "
4822 "data %q+#D are wrong (you%'ll wind up "
4823 "with multiple copies)", decl);
4824 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4825 " you can work around this by removing "
4830 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4831 /* Set it up again; we might have set DECL_INITIAL since the last
4833 comdat_linkage (decl);
4836 /* Issue an error message if DECL is an uninitialized const variable. */
4839 check_for_uninitialized_const_var (tree decl)
4841 tree type = strip_array_types (TREE_TYPE (decl));
4843 /* ``Unless explicitly declared extern, a const object does not have
4844 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4846 if (TREE_CODE (decl) == VAR_DECL
4847 && TREE_CODE (type) != REFERENCE_TYPE
4848 && CP_TYPE_CONST_P (type)
4849 && (!TYPE_NEEDS_CONSTRUCTING (type)
4850 || !type_has_user_provided_default_constructor (type))
4851 && !DECL_INITIAL (decl))
4853 permerror (DECL_SOURCE_LOCATION (decl),
4854 "uninitialized const %qD", decl);
4856 if (CLASS_TYPE_P (type)
4857 && !type_has_user_provided_default_constructor (type))
4859 tree defaulted_ctor;
4861 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4862 "%q#T has no user-provided default constructor", type);
4863 defaulted_ctor = in_class_defaulted_default_constructor (type);
4865 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4866 "constructor is not user-provided because it is "
4867 "explicitly defaulted in the class body");
4872 /* Structure holding the current initializer being processed by reshape_init.
4873 CUR is a pointer to the current element being processed, END is a pointer
4874 after the last element present in the initializer. */
4875 typedef struct reshape_iterator_t
4877 constructor_elt *cur;
4878 constructor_elt *end;
4881 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4883 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4884 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4885 initialized. If there are no more such fields, the return value
4889 next_initializable_field (tree field)
4892 && (TREE_CODE (field) != FIELD_DECL
4893 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4894 || DECL_ARTIFICIAL (field)))
4895 field = DECL_CHAIN (field);
4900 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4901 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4902 INTEGER_CST representing the size of the array minus one (the maximum index),
4903 or NULL_TREE if the array was declared without specifying the size. D is
4904 the iterator within the constructor. */
4907 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4908 tsubst_flags_t complain)
4911 bool sized_array_p = (max_index != NULL_TREE);
4912 unsigned HOST_WIDE_INT max_index_cst = 0;
4913 unsigned HOST_WIDE_INT index;
4915 /* The initializer for an array is always a CONSTRUCTOR. */
4916 new_init = build_constructor (init_list_type_node, NULL);
4920 /* Minus 1 is used for zero sized arrays. */
4921 if (integer_all_onesp (max_index))
4924 if (host_integerp (max_index, 1))
4925 max_index_cst = tree_low_cst (max_index, 1);
4926 /* sizetype is sign extended, not zero extended. */
4928 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4932 /* Loop until there are no more initializers. */
4934 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4939 check_array_designated_initializer (d->cur);
4940 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4942 if (elt_init == error_mark_node)
4943 return error_mark_node;
4944 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4945 size_int (index), elt_init);
4946 if (!TREE_CONSTANT (elt_init))
4947 TREE_CONSTANT (new_init) = false;
4953 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4954 Parameters are the same of reshape_init_r. */
4957 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
4959 tree max_index = NULL_TREE;
4961 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4963 if (TYPE_DOMAIN (type))
4964 max_index = array_type_nelts (type);
4966 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
4969 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4970 Parameters are the same of reshape_init_r. */
4973 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
4975 tree max_index = NULL_TREE;
4977 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4979 if (COMPOUND_LITERAL_P (d->cur->value))
4981 tree value = d->cur->value;
4982 if (!same_type_p (TREE_TYPE (value), type))
4984 if (complain & tf_error)
4985 error ("invalid type %qT as initializer for a vector of type %qT",
4986 TREE_TYPE (d->cur->value), type);
4987 value = error_mark_node;
4993 /* For a vector, we initialize it as an array of the appropriate size. */
4994 if (TREE_CODE (type) == VECTOR_TYPE)
4995 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4997 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5000 /* Subroutine of reshape_init_r, processes the initializers for classes
5001 or union. Parameters are the same of reshape_init_r. */
5004 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5005 tsubst_flags_t complain)
5010 gcc_assert (CLASS_TYPE_P (type));
5012 /* The initializer for a class is always a CONSTRUCTOR. */
5013 new_init = build_constructor (init_list_type_node, NULL);
5014 field = next_initializable_field (TYPE_FIELDS (type));
5020 An initializer for an aggregate member that is an
5021 empty class shall have the form of an empty
5022 initializer-list {}. */
5023 if (!first_initializer_p)
5025 if (complain & tf_error)
5026 error ("initializer for %qT must be brace-enclosed", type);
5027 return error_mark_node;
5032 /* Loop through the initializable fields, gathering initializers. */
5033 while (d->cur != d->end)
5037 /* Handle designated initializers, as an extension. */
5040 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5042 if (!field || TREE_CODE (field) != FIELD_DECL)
5044 if (complain & tf_error)
5045 error ("%qT has no non-static data member named %qD", type,
5047 return error_mark_node;
5051 /* If we processed all the member of the class, we are done. */
5055 field_init = reshape_init_r (TREE_TYPE (field), d,
5056 /*first_initializer_p=*/false, complain);
5057 if (field_init == error_mark_node)
5058 return error_mark_node;
5060 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5064 When a union is initialized with a brace-enclosed
5065 initializer, the braces shall only contain an
5066 initializer for the first member of the union. */
5067 if (TREE_CODE (type) == UNION_TYPE)
5070 field = next_initializable_field (DECL_CHAIN (field));
5076 /* Subroutine of reshape_init, which processes a single initializer (part of
5077 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5078 iterator within the CONSTRUCTOR which points to the initializer to process.
5079 FIRST_INITIALIZER_P is true if this is the first initializer of the
5080 outermost CONSTRUCTOR node. */
5083 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5084 tsubst_flags_t complain)
5086 tree init = d->cur->value;
5088 if (error_operand_p (init))
5089 return error_mark_node;
5091 if (TREE_CODE (type) == COMPLEX_TYPE)
5093 /* A complex type can be initialized from one or two initializers,
5094 but braces are not elided. */
5096 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5098 if (CONSTRUCTOR_NELTS (init) > 2)
5100 if (complain & tf_error)
5101 error ("too many initializers for %qT", type);
5103 return error_mark_node;
5106 else if (first_initializer_p && d->cur != d->end)
5108 VEC(constructor_elt, gc) *v = 0;
5109 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5110 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5112 init = build_constructor (init_list_type_node, v);
5117 /* A non-aggregate type is always initialized with a single
5119 if (!CP_AGGREGATE_TYPE_P (type))
5121 /* It is invalid to initialize a non-aggregate type with a
5122 brace-enclosed initializer before C++0x.
5123 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5124 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5125 a CONSTRUCTOR (with a record type). */
5126 if (TREE_CODE (init) == CONSTRUCTOR
5127 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5129 if (SCALAR_TYPE_P (type))
5131 if (complain & tf_error)
5132 error ("braces around scalar initializer for type %qT", type);
5133 init = error_mark_node;
5136 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5145 All implicit type conversions (clause _conv_) are considered when
5146 initializing the aggregate member with an initializer from an
5147 initializer-list. If the initializer can initialize a member,
5148 the member is initialized. Otherwise, if the member is itself a
5149 non-empty subaggregate, brace elision is assumed and the
5150 initializer is considered for the initialization of the first
5151 member of the subaggregate. */
5152 if (TREE_CODE (init) != CONSTRUCTOR
5153 /* But don't try this for the first initializer, since that would be
5154 looking through the outermost braces; A a2 = { a1 }; is not a
5155 valid aggregate initialization. */
5156 && !first_initializer_p
5157 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5158 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5164 /* [dcl.init.string]
5166 A char array (whether plain char, signed char, or unsigned char)
5167 can be initialized by a string-literal (optionally enclosed in
5168 braces); a wchar_t array can be initialized by a wide
5169 string-literal (optionally enclosed in braces). */
5170 if (TREE_CODE (type) == ARRAY_TYPE
5171 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5173 tree str_init = init;
5175 /* Strip one level of braces if and only if they enclose a single
5176 element (as allowed by [dcl.init.string]). */
5177 if (!first_initializer_p
5178 && TREE_CODE (str_init) == CONSTRUCTOR
5179 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5181 str_init = VEC_index (constructor_elt,
5182 CONSTRUCTOR_ELTS (str_init), 0)->value;
5185 /* If it's a string literal, then it's the initializer for the array
5186 as a whole. Otherwise, continue with normal initialization for
5187 array types (one value per array element). */
5188 if (TREE_CODE (str_init) == STRING_CST)
5195 /* The following cases are about aggregates. If we are not within a full
5196 initializer already, and there is not a CONSTRUCTOR, it means that there
5197 is a missing set of braces (that is, we are processing the case for
5198 which reshape_init exists). */
5199 if (!first_initializer_p)
5201 if (TREE_CODE (init) == CONSTRUCTOR)
5203 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5204 /* There is no need to reshape pointer-to-member function
5205 initializers, as they are always constructed correctly
5206 by the front end. */
5208 else if (COMPOUND_LITERAL_P (init))
5209 /* For a nested compound literal, there is no need to reshape since
5210 brace elision is not allowed. Even if we decided to allow it,
5211 we should add a call to reshape_init in finish_compound_literal,
5212 before calling digest_init, so changing this code would still
5213 not be necessary. */
5214 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5218 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5219 return reshape_init (type, init, complain);
5223 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5227 /* Dispatch to specialized routines. */
5228 if (CLASS_TYPE_P (type))
5229 return reshape_init_class (type, d, first_initializer_p, complain);
5230 else if (TREE_CODE (type) == ARRAY_TYPE)
5231 return reshape_init_array (type, d, complain);
5232 else if (TREE_CODE (type) == VECTOR_TYPE)
5233 return reshape_init_vector (type, d, complain);
5238 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5239 brace-enclosed aggregate initializer.
5241 INIT is the CONSTRUCTOR containing the list of initializers describing
5242 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5243 It may not presently match the shape of the TYPE; for example:
5245 struct S { int a; int b; };
5246 struct S a[] = { 1, 2, 3, 4 };
5248 Here INIT will hold a VEC of four elements, rather than a
5249 VEC of two elements, each itself a VEC of two elements. This
5250 routine transforms INIT from the former form into the latter. The
5251 revised CONSTRUCTOR node is returned. */
5254 reshape_init (tree type, tree init, tsubst_flags_t complain)
5256 VEC(constructor_elt, gc) *v;
5260 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5262 v = CONSTRUCTOR_ELTS (init);
5264 /* An empty constructor does not need reshaping, and it is always a valid
5266 if (VEC_empty (constructor_elt, v))
5269 /* Recurse on this CONSTRUCTOR. */
5270 d.cur = VEC_index (constructor_elt, v, 0);
5271 d.end = d.cur + VEC_length (constructor_elt, v);
5273 new_init = reshape_init_r (type, &d, true, complain);
5274 if (new_init == error_mark_node)
5275 return error_mark_node;
5277 /* Make sure all the element of the constructor were used. Otherwise,
5278 issue an error about exceeding initializers. */
5281 if (complain & tf_error)
5282 error ("too many initializers for %qT", type);
5284 return error_mark_node;
5290 /* Verify array initializer. Returns true if errors have been reported. */
5293 check_array_initializer (tree decl, tree type, tree init)
5295 tree element_type = TREE_TYPE (type);
5297 /* The array type itself need not be complete, because the
5298 initializer may tell us how many elements are in the array.
5299 But, the elements of the array must be complete. */
5300 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5303 error ("elements of array %q#D have incomplete type", decl);
5305 error ("elements of array %q#T have incomplete type", type);
5308 /* It is not valid to initialize a VLA. */
5310 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5311 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5314 error ("variable-sized object %qD may not be initialized", decl);
5316 error ("variable-sized compound literal");
5322 /* Subroutine of check_initializer; args are passed down from that function.
5323 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5326 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5329 int saved_stmts_are_full_exprs_p = 0;
5330 if (building_stmt_tree ())
5332 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5333 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5335 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5336 if (building_stmt_tree ())
5337 current_stmt_tree ()->stmts_are_full_exprs_p =
5338 saved_stmts_are_full_exprs_p;
5342 /* Verify INIT (the initializer for DECL), and record the
5343 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5344 grok_reference_init.
5346 If the return value is non-NULL, it is an expression that must be
5347 evaluated dynamically to initialize DECL. */
5350 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5352 tree type = TREE_TYPE (decl);
5353 tree init_code = NULL;
5354 tree extra_init = NULL_TREE;
5357 /* Things that are going to be initialized need to have complete
5359 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5361 if (type == error_mark_node)
5362 /* We will have already complained. */
5365 if (TREE_CODE (type) == ARRAY_TYPE)
5367 if (check_array_initializer (decl, type, init))
5370 else if (!COMPLETE_TYPE_P (type))
5372 error ("%qD has incomplete type", decl);
5373 TREE_TYPE (decl) = error_mark_node;
5377 /* There is no way to make a variable-sized class type in GNU C++. */
5378 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5380 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5382 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5383 if (SCALAR_TYPE_P (type))
5387 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5388 init = build_zero_init (type, NULL_TREE, false);
5390 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5392 error ("scalar object %qD requires one element in initializer",
5394 TREE_TYPE (decl) = error_mark_node;
5400 if (TREE_CODE (decl) == CONST_DECL)
5402 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5404 DECL_INITIAL (decl) = init;
5406 gcc_assert (init != NULL_TREE);
5409 else if (!init && DECL_REALLY_EXTERN (decl))
5411 else if (TREE_CODE (type) == REFERENCE_TYPE)
5412 init = grok_reference_init (decl, type, init, cleanup);
5413 else if (init || type_build_ctor_call (type))
5416 check_for_uninitialized_const_var (decl);
5417 /* Do not reshape constructors of vectors (they don't need to be
5419 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5421 if (is_std_init_list (type))
5422 init = build_init_list_var_init (decl, type, init,
5423 &extra_init, cleanup);
5424 else if (TYPE_NON_AGGREGATE_CLASS (type))
5426 /* Don't reshape if the class has constructors. */
5427 if (cxx_dialect == cxx98)
5428 error ("in C++98 %qD must be initialized by constructor, "
5432 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5434 error ("opaque vector types cannot be initialized");
5435 init = error_mark_node;
5438 init = reshape_init (type, init, tf_warning_or_error);
5441 /* If DECL has an array type without a specific bound, deduce the
5442 array size from the initializer. */
5443 maybe_deduce_size_from_array_init (decl, init);
5444 type = TREE_TYPE (decl);
5445 if (type == error_mark_node)
5448 if (type_build_ctor_call (type)
5449 || (CLASS_TYPE_P (type)
5450 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5452 init_code = build_aggr_init_full_exprs (decl, init, flags);
5454 /* If this is a constexpr initializer, expand_default_init will
5455 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5456 case, pull the initializer back out and pass it down into
5457 store_init_value. */
5458 while (TREE_CODE (init_code) == EXPR_STMT
5459 || TREE_CODE (init_code) == CONVERT_EXPR)
5460 init_code = TREE_OPERAND (init_code, 0);
5461 if (TREE_CODE (init_code) == INIT_EXPR)
5463 init = TREE_OPERAND (init_code, 1);
5464 init_code = NULL_TREE;
5465 /* Don't call digest_init; it's unnecessary and will complain
5466 about aggregate initialization of non-aggregate classes. */
5467 flags |= LOOKUP_ALREADY_DIGESTED;
5469 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5471 /* Declared constexpr, but no suitable initializer; massage
5472 init appropriately so we can pass it into store_init_value
5474 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5475 init = finish_compound_literal (type, init,
5476 tf_warning_or_error);
5477 else if (CLASS_TYPE_P (type)
5478 && (!init || TREE_CODE (init) == TREE_LIST))
5480 init = build_functional_cast (type, init, tf_none);
5481 if (init != error_mark_node)
5482 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5484 init_code = NULL_TREE;
5490 if (init && TREE_CODE (init) != TREE_VEC)
5492 init_code = store_init_value (decl, init, flags);
5493 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5494 && DECL_INITIAL (decl)
5495 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5496 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5497 warning (0, "array %qD initialized by parenthesized string literal %qE",
5498 decl, DECL_INITIAL (decl));
5504 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5505 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5506 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5507 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5510 check_for_uninitialized_const_var (decl);
5513 if (init && init != error_mark_node)
5514 init_code = build2 (INIT_EXPR, type, decl, init);
5517 init_code = add_stmt_to_compound (extra_init, init_code);
5519 if (init_code && DECL_IN_AGGR_P (decl))
5521 static int explained = 0;
5523 if (cxx_dialect < cxx0x)
5524 error ("initializer invalid for static member with constructor");
5526 error ("non-constant in-class initialization invalid for static "
5527 "member %qD", decl);
5530 error ("(an out of class initialization is required)");
5538 /* If DECL is not a local variable, give it RTL. */
5541 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5543 int toplev = toplevel_bindings_p ();
5545 const char *filename;
5547 /* Set the DECL_ASSEMBLER_NAME for the object. */
5550 /* The `register' keyword, when used together with an
5551 asm-specification, indicates that the variable should be
5552 placed in a particular register. */
5553 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5555 set_user_assembler_name (decl, asmspec);
5556 DECL_HARD_REGISTER (decl) = 1;
5560 if (TREE_CODE (decl) == FUNCTION_DECL
5561 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5562 set_builtin_user_assembler_name (decl, asmspec);
5563 set_user_assembler_name (decl, asmspec);
5567 /* Handle non-variables up front. */
5568 if (TREE_CODE (decl) != VAR_DECL)
5570 rest_of_decl_compilation (decl, toplev, at_eof);
5574 /* If we see a class member here, it should be a static data
5576 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5578 gcc_assert (TREE_STATIC (decl));
5579 /* An in-class declaration of a static data member should be
5580 external; it is only a declaration, and not a definition. */
5581 if (init == NULL_TREE)
5582 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5585 /* We don't create any RTL for local variables. */
5586 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5589 /* We defer emission of local statics until the corresponding
5590 DECL_EXPR is expanded. */
5591 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5593 /* We try to defer namespace-scope static constants so that they are
5594 not emitted into the object file unnecessarily. */
5595 filename = input_filename;
5596 if (!DECL_VIRTUAL_P (decl)
5597 && TREE_READONLY (decl)
5598 && DECL_INITIAL (decl) != NULL_TREE
5599 && DECL_INITIAL (decl) != error_mark_node
5601 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5603 && !TREE_PUBLIC (decl))
5605 /* Fool with the linkage of static consts according to #pragma
5607 struct c_fileinfo *finfo = get_fileinfo (filename);
5608 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5610 TREE_PUBLIC (decl) = 1;
5611 DECL_EXTERNAL (decl) = finfo->interface_only;
5616 /* Likewise for template instantiations. */
5617 else if (DECL_LANG_SPECIFIC (decl)
5618 && DECL_IMPLICIT_INSTANTIATION (decl))
5621 /* If we're not deferring, go ahead and assemble the variable. */
5623 rest_of_decl_compilation (decl, toplev, at_eof);
5626 /* walk_tree helper for wrap_temporary_cleanups, below. */
5629 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5631 if (TYPE_P (*stmt_p))
5637 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5639 tree guard = (tree)data;
5640 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5642 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5643 /* Tell honor_protect_cleanup_actions to handle this as a separate
5645 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5647 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5653 /* We're initializing a local variable which has a cleanup GUARD. If there
5654 are any temporaries used in the initializer INIT of this variable, we
5655 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5656 variable will be cleaned up properly if one of them throws.
5658 Unfortunately, there's no way to express this properly in terms of
5659 nesting, as the regions for the temporaries overlap the region for the
5660 variable itself; if there are two temporaries, the variable needs to be
5661 the first thing destroyed if either of them throws. However, we only
5662 want to run the variable's cleanup if it actually got constructed. So
5663 we need to guard the temporary cleanups with the variable's cleanup if
5664 they are run on the normal path, but not if they are run on the
5665 exceptional path. We implement this by telling
5666 honor_protect_cleanup_actions to strip the variable cleanup from the
5667 exceptional path. */
5670 wrap_temporary_cleanups (tree init, tree guard)
5672 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5675 /* Generate code to initialize DECL (a local variable). */
5678 initialize_local_var (tree decl, tree init)
5680 tree type = TREE_TYPE (decl);
5684 gcc_assert (TREE_CODE (decl) == VAR_DECL
5685 || TREE_CODE (decl) == RESULT_DECL);
5686 gcc_assert (!TREE_STATIC (decl));
5688 if (DECL_SIZE (decl) == NULL_TREE)
5690 /* If we used it already as memory, it must stay in memory. */
5691 DECL_INITIAL (decl) = NULL_TREE;
5692 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5696 if (type == error_mark_node)
5699 /* Compute and store the initial value. */
5700 already_used = TREE_USED (decl) || TREE_USED (type);
5701 if (TREE_USED (type))
5702 DECL_READ_P (decl) = 1;
5704 /* Generate a cleanup, if necessary. */
5705 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5707 /* Perform the initialization. */
5710 if (TREE_CODE (init) == INIT_EXPR
5711 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5713 /* Stick simple initializers in DECL_INITIAL so that
5714 -Wno-init-self works (c++/34772). */
5715 gcc_assert (TREE_OPERAND (init, 0) == decl);
5716 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5720 int saved_stmts_are_full_exprs_p;
5722 /* If we're only initializing a single object, guard the
5723 destructors of any temporaries used in its initializer with
5724 its destructor. This isn't right for arrays because each
5725 element initialization is a full-expression. */
5726 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5727 wrap_temporary_cleanups (init, cleanup);
5729 gcc_assert (building_stmt_tree ());
5730 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5731 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5732 finish_expr_stmt (init);
5733 current_stmt_tree ()->stmts_are_full_exprs_p =
5734 saved_stmts_are_full_exprs_p;
5738 /* Set this to 0 so we can tell whether an aggregate which was
5739 initialized was ever used. Don't do this if it has a
5740 destructor, so we don't complain about the 'resource
5741 allocation is initialization' idiom. Now set
5742 attribute((unused)) on types so decls of that type will be
5743 marked used. (see TREE_USED, above.) */
5744 if (TYPE_NEEDS_CONSTRUCTING (type)
5746 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5747 && DECL_NAME (decl))
5748 TREE_USED (decl) = 0;
5749 else if (already_used)
5750 TREE_USED (decl) = 1;
5753 finish_decl_cleanup (decl, cleanup);
5756 /* DECL is a VAR_DECL for a compiler-generated variable with static
5757 storage duration (like a virtual table) whose initializer is a
5758 compile-time constant. Initialize the variable and provide it to the
5762 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5765 gcc_assert (DECL_ARTIFICIAL (decl));
5766 init = build_constructor (TREE_TYPE (decl), v);
5767 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5768 DECL_INITIAL (decl) = init;
5769 DECL_INITIALIZED_P (decl) = 1;
5770 determine_visibility (decl);
5771 layout_var_decl (decl);
5772 maybe_commonize_var (decl);
5773 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5776 /* INIT is the initializer for a variable, as represented by the
5777 parser. Returns true iff INIT is type-dependent. */
5780 type_dependent_init_p (tree init)
5782 if (TREE_CODE (init) == TREE_LIST)
5783 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5784 return any_type_dependent_elements_p (init);
5785 else if (TREE_CODE (init) == CONSTRUCTOR)
5786 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5788 VEC(constructor_elt, gc) *elts;
5792 elts = CONSTRUCTOR_ELTS (init);
5793 nelts = VEC_length (constructor_elt, elts);
5794 for (i = 0; i < nelts; ++i)
5795 if (type_dependent_init_p (VEC_index (constructor_elt,
5800 /* It must be a simple expression, e.g., int i = 3; */
5801 return type_dependent_expression_p (init);
5806 /* INIT is the initializer for a variable, as represented by the
5807 parser. Returns true iff INIT is value-dependent. */
5810 value_dependent_init_p (tree init)
5812 if (TREE_CODE (init) == TREE_LIST)
5813 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5814 return any_value_dependent_elements_p (init);
5815 else if (TREE_CODE (init) == CONSTRUCTOR)
5816 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5818 VEC(constructor_elt, gc) *elts;
5822 elts = CONSTRUCTOR_ELTS (init);
5823 nelts = VEC_length (constructor_elt, elts);
5824 for (i = 0; i < nelts; ++i)
5825 if (value_dependent_init_p (VEC_index (constructor_elt,
5830 /* It must be a simple expression, e.g., int i = 3; */
5831 return value_dependent_expression_p (init);
5836 /* Finish processing of a declaration;
5837 install its line number and initial value.
5838 If the length of an array type is not known before,
5839 it must be determined now, from the initial value, or it is an error.
5841 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5842 true, then INIT is an integral constant expression.
5844 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5845 if the (init) syntax was used. */
5848 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5849 tree asmspec_tree, int flags)
5853 const char *asmspec = NULL;
5854 int was_readonly = 0;
5855 bool var_definition_p = false;
5858 if (decl == error_mark_node)
5863 error ("assignment (not initialization) in declaration");
5867 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5868 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5869 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5871 type = TREE_TYPE (decl);
5872 if (type == error_mark_node)
5875 /* Assume no cleanup is required. */
5876 cleanup = NULL_TREE;
5878 /* If a name was specified, get the string. */
5879 if (global_scope_p (current_binding_level))
5880 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5881 if (asmspec_tree && asmspec_tree != error_mark_node)
5882 asmspec = TREE_STRING_POINTER (asmspec_tree);
5884 if (current_class_type
5885 && CP_DECL_CONTEXT (decl) == current_class_type
5886 && TYPE_BEING_DEFINED (current_class_type)
5887 && (DECL_INITIAL (decl) || init))
5888 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5890 auto_node = type_uses_auto (type);
5894 if (init == NULL_TREE)
5896 error ("declaration of %q#D has no initializer", decl);
5897 TREE_TYPE (decl) = error_mark_node;
5901 if (TREE_CODE (d_init) == TREE_LIST)
5902 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5903 tf_warning_or_error);
5904 d_init = resolve_nondeduced_context (d_init);
5905 if (describable_type (d_init))
5907 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5909 if (type == error_mark_node)
5914 if (TREE_CODE (decl) == FUNCTION_DECL
5915 /* For members, defer until finalize_literal_type_property. */
5916 && (!DECL_CLASS_SCOPE_P (decl)
5917 || !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))))
5918 validate_constexpr_fundecl (decl);
5920 else if (!ensure_literal_type_for_constexpr_object (decl))
5921 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5923 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5926 if (init == ridpointers[(int)RID_DELETE])
5928 /* FIXME check this is 1st decl. */
5929 DECL_DELETED_FN (decl) = 1;
5930 DECL_DECLARED_INLINE_P (decl) = 1;
5931 DECL_INITIAL (decl) = error_mark_node;
5932 FOR_EACH_CLONE (clone, decl)
5934 DECL_DELETED_FN (clone) = 1;
5935 DECL_DECLARED_INLINE_P (clone) = 1;
5936 DECL_INITIAL (clone) = error_mark_node;
5940 else if (init == ridpointers[(int)RID_DEFAULT])
5942 if (defaultable_fn_check (decl))
5943 DECL_DEFAULTED_FN (decl) = 1;
5945 DECL_INITIAL (decl) = NULL_TREE;
5949 if (init && TREE_CODE (decl) == VAR_DECL)
5951 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5952 if (init_const_expr_p)
5954 /* Set these flags now for templates. We'll update the flags in
5955 store_init_value for instantiations. */
5956 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5957 if (decl_maybe_constant_var_p (decl))
5958 TREE_CONSTANT (decl) = 1;
5962 if (processing_template_decl)
5964 bool type_dependent_p;
5966 /* Add this declaration to the statement-tree. */
5967 if (at_function_scope_p ())
5968 add_decl_expr (decl);
5970 type_dependent_p = dependent_type_p (type);
5972 if (check_for_bare_parameter_packs (init))
5975 DECL_INITIAL (decl) = NULL_TREE;
5978 /* Generally, initializers in templates are expanded when the
5979 template is instantiated. But, if DECL is a variable constant
5980 then it can be used in future constant expressions, so its value
5981 must be available. */
5983 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
5984 /* We can't do anything if the decl has dependent type. */;
5986 && init_const_expr_p
5987 && !type_dependent_p
5988 && decl_maybe_constant_var_p (decl)
5989 && !type_dependent_init_p (init)
5990 && !value_dependent_init_p (init))
5992 /* This variable seems to be a non-dependent constant, so process
5993 its initializer. If check_initializer returns non-null the
5994 initialization wasn't constant after all. */
5995 tree init_code = check_initializer (decl, init, flags, &cleanup);
5996 if (init_code == NULL_TREE)
5999 else if (!DECL_PRETTY_FUNCTION_P (decl))
6000 /* Deduce array size even if the initializer is dependent. */
6001 maybe_deduce_size_from_array_init (decl, init);
6004 DECL_INITIAL (decl) = init;
6008 /* Take care of TYPE_DECLs up front. */
6009 if (TREE_CODE (decl) == TYPE_DECL)
6011 if (type != error_mark_node
6012 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6014 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6015 warning (0, "shadowing previous type declaration of %q#D", decl);
6016 set_identifier_type_value (DECL_NAME (decl), decl);
6019 /* If we have installed this as the canonical typedef for this
6020 type, and that type has not been defined yet, delay emitting
6021 the debug information for it, as we will emit it later. */
6022 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6023 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6024 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6026 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6031 /* A reference will be modified here, as it is initialized. */
6032 if (! DECL_EXTERNAL (decl)
6033 && TREE_READONLY (decl)
6034 && TREE_CODE (type) == REFERENCE_TYPE)
6037 TREE_READONLY (decl) = 0;
6040 if (TREE_CODE (decl) == VAR_DECL)
6042 /* Only variables with trivial initialization and destruction can
6043 have thread-local storage. */
6044 if (DECL_THREAD_LOCAL_P (decl)
6045 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6046 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6047 error ("%qD cannot be thread-local because it has non-trivial "
6048 "type %qT", decl, TREE_TYPE (decl));
6049 /* If this is a local variable that will need a mangled name,
6050 register it now. We must do this before processing the
6051 initializer for the variable, since the initialization might
6052 require a guard variable, and since the mangled name of the
6053 guard variable will depend on the mangled name of this
6055 if (DECL_FUNCTION_SCOPE_P (decl)
6056 && TREE_STATIC (decl)
6057 && !DECL_ARTIFICIAL (decl))
6059 push_local_name (decl);
6060 if (DECL_CONSTRUCTOR_P (current_function_decl)
6061 || DECL_DESTRUCTOR_P (current_function_decl))
6062 /* Normally local_decls is populated during GIMPLE lowering,
6063 but [cd]tors are never actually compiled directly. We need
6064 to put statics on the list so we can deal with the label
6065 address extension. */
6066 add_local_decl (cfun, decl);
6069 /* Convert the initializer to the type of DECL, if we have not
6070 already initialized DECL. */
6071 if (!DECL_INITIALIZED_P (decl)
6072 /* If !DECL_EXTERNAL then DECL is being defined. In the
6073 case of a static data member initialized inside the
6074 class-specifier, there can be an initializer even if DECL
6075 is *not* defined. */
6076 && (!DECL_EXTERNAL (decl) || init))
6078 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6081 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6082 /* Allow libjava/prims.cc define primitive classes. */
6083 if (init != NULL_TREE
6084 || jclass == NULL_TREE
6085 || TREE_CODE (jclass) != TYPE_DECL
6086 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6087 || !same_type_ignoring_top_level_qualifiers_p
6088 (type, TREE_TYPE (TREE_TYPE (jclass))))
6089 error ("Java object %qD not allocated with %<new%>", decl);
6092 init = check_initializer (decl, init, flags, &cleanup);
6093 /* Thread-local storage cannot be dynamically initialized. */
6094 if (DECL_THREAD_LOCAL_P (decl) && init)
6096 error ("%qD is thread-local and so cannot be dynamically "
6097 "initialized", decl);
6101 /* Check that the initializer for a static data member was a
6102 constant. Although we check in the parser that the
6103 initializer is an integral constant expression, we do not
6104 simplify division-by-zero at the point at which it
6105 occurs. Therefore, in:
6107 struct S { static const int i = 7 / 0; };
6109 we issue an error at this point. It would
6110 probably be better to forbid division by zero in
6111 integral constant expressions. */
6112 if (DECL_EXTERNAL (decl) && init)
6114 error ("%qD cannot be initialized by a non-constant expression"
6115 " when being declared", decl);
6116 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6124 The memory occupied by any object of static storage
6125 duration is zero-initialized at program startup before
6126 any other initialization takes place.
6128 We cannot create an appropriate initializer until after
6129 the type of DECL is finalized. If DECL_INITIAL is set,
6130 then the DECL is statically initialized, and any
6131 necessary zero-initialization has already been performed. */
6132 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6133 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6134 /*nelts=*/NULL_TREE,
6135 /*static_storage_p=*/true);
6136 /* Remember that the initialization for this variable has
6138 DECL_INITIALIZED_P (decl) = 1;
6139 /* This declaration is the definition of this variable,
6140 unless we are initializing a static data member within
6141 the class specifier. */
6142 if (!DECL_EXTERNAL (decl))
6143 var_definition_p = true;
6145 /* If the variable has an array type, lay out the type, even if
6146 there is no initializer. It is valid to index through the
6147 array, and we must get TYPE_ALIGN set correctly on the array
6149 else if (TREE_CODE (type) == ARRAY_TYPE)
6152 if (TREE_STATIC (decl)
6153 && !at_function_scope_p ()
6154 && current_function_decl == NULL)
6155 /* So decl is a global variable or a static member of a
6156 non local class. Record the types it uses
6157 so that we can decide later to emit debug info for them. */
6158 record_types_used_by_current_var_decl (decl);
6160 else if (TREE_CODE (decl) == FIELD_DECL
6161 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6162 error ("non-static data member %qD has Java class type", decl);
6164 /* Add this declaration to the statement-tree. This needs to happen
6165 after the call to check_initializer so that the DECL_EXPR for a
6166 reference temp is added before the DECL_EXPR for the reference itself. */
6167 if (at_function_scope_p ())
6168 add_decl_expr (decl);
6170 /* Let the middle end know about variables and functions -- but not
6171 static data members in uninstantiated class templates. */
6172 if (TREE_CODE (decl) == VAR_DECL
6173 || TREE_CODE (decl) == FUNCTION_DECL)
6175 if (TREE_CODE (decl) == VAR_DECL)
6177 layout_var_decl (decl);
6178 maybe_commonize_var (decl);
6181 /* This needs to happen after the linkage is set. */
6182 determine_visibility (decl);
6184 if (var_definition_p && TREE_STATIC (decl))
6186 /* If a TREE_READONLY variable needs initialization
6187 at runtime, it is no longer readonly and we need to
6188 avoid MEM_READONLY_P being set on RTL created for it. */
6191 if (TREE_READONLY (decl))
6192 TREE_READONLY (decl) = 0;
6195 else if (was_readonly)
6196 TREE_READONLY (decl) = 1;
6199 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6201 /* Check for abstractness of the type. Notice that there is no
6202 need to strip array types here since the check for those types
6203 is already done within create_array_type_for_decl. */
6204 if (TREE_CODE (type) == FUNCTION_TYPE
6205 || TREE_CODE (type) == METHOD_TYPE)
6206 abstract_virtuals_error (decl, TREE_TYPE (type));
6208 abstract_virtuals_error (decl, type);
6210 if (TREE_TYPE (decl) == error_mark_node)
6211 /* No initialization required. */
6213 else if (TREE_CODE (decl) == FUNCTION_DECL)
6217 if (init == ridpointers[(int)RID_DEFAULT])
6219 /* An out-of-class default definition is defined at
6220 the point where it is explicitly defaulted. */
6221 if (DECL_DELETED_FN (decl))
6222 maybe_explain_implicit_delete (decl);
6223 else if (DECL_INITIAL (decl) == error_mark_node)
6224 synthesize_method (decl);
6227 error ("function %q#D is initialized like a variable", decl);
6229 /* else no initialization required. */
6231 else if (DECL_EXTERNAL (decl)
6232 && ! (DECL_LANG_SPECIFIC (decl)
6233 && DECL_NOT_REALLY_EXTERN (decl)))
6236 DECL_INITIAL (decl) = init;
6238 /* A variable definition. */
6239 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6240 /* Initialize the local variable. */
6241 initialize_local_var (decl, init);
6243 /* If a variable is defined, and then a subsequent
6244 definition with external linkage is encountered, we will
6245 get here twice for the same variable. We want to avoid
6246 calling expand_static_init more than once. For variables
6247 that are not static data members, we can call
6248 expand_static_init only when we actually process the
6249 initializer. It is not legal to redeclare a static data
6250 member, so this issue does not arise in that case. */
6251 else if (var_definition_p && TREE_STATIC (decl))
6252 expand_static_init (decl, init);
6255 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6256 reference, insert it in the statement-tree now. */
6258 push_cleanup (decl, cleanup, false);
6261 TREE_READONLY (decl) = 1;
6264 /* Returns a declaration for a VAR_DECL as if:
6266 extern "C" TYPE NAME;
6268 had been seen. Used to create compiler-generated global
6272 declare_global_var (tree name, tree type)
6276 push_to_top_level ();
6277 decl = build_decl (input_location, VAR_DECL, name, type);
6278 TREE_PUBLIC (decl) = 1;
6279 DECL_EXTERNAL (decl) = 1;
6280 DECL_ARTIFICIAL (decl) = 1;
6281 /* If the user has explicitly declared this variable (perhaps
6282 because the code we are compiling is part of a low-level runtime
6283 library), then it is possible that our declaration will be merged
6284 with theirs by pushdecl. */
6285 decl = pushdecl (decl);
6286 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6287 pop_from_top_level ();
6292 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6293 if "__cxa_atexit" is not being used) corresponding to the function
6294 to be called when the program exits. */
6297 get_atexit_fn_ptr_type (void)
6301 if (!atexit_fn_ptr_type_node)
6304 if (flag_use_cxa_atexit
6305 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6306 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6307 arg_type = ptr_type_node;
6309 /* The parameter to "atexit" is "void (*)(void)". */
6310 arg_type = NULL_TREE;
6312 fn_type = build_function_type_list (void_type_node,
6313 arg_type, NULL_TREE);
6314 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6317 return atexit_fn_ptr_type_node;
6320 /* Returns a pointer to the `atexit' function. Note that if
6321 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6322 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6325 get_atexit_node (void)
6331 bool use_aeabi_atexit;
6336 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6338 /* The declaration for `__cxa_atexit' is:
6340 int __cxa_atexit (void (*)(void *), void *, void *)
6342 We build up the argument types and then the function type
6344 tree argtype0, argtype1, argtype2;
6346 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6347 /* First, build the pointer-to-function type for the first
6349 fn_ptr_type = get_atexit_fn_ptr_type ();
6350 /* Then, build the rest of the argument types. */
6351 argtype2 = ptr_type_node;
6352 if (use_aeabi_atexit)
6354 argtype1 = fn_ptr_type;
6355 argtype0 = ptr_type_node;
6359 argtype1 = ptr_type_node;
6360 argtype0 = fn_ptr_type;
6362 /* And the final __cxa_atexit type. */
6363 fn_type = build_function_type_list (integer_type_node,
6364 argtype0, argtype1, argtype2,
6366 fn_ptr_type = build_pointer_type (fn_type);
6367 if (use_aeabi_atexit)
6368 name = "__aeabi_atexit";
6370 name = "__cxa_atexit";
6374 /* The declaration for `atexit' is:
6376 int atexit (void (*)());
6378 We build up the argument types and then the function type
6380 fn_ptr_type = get_atexit_fn_ptr_type ();
6381 /* Build the final atexit type. */
6382 fn_type = build_function_type_list (integer_type_node,
6383 fn_ptr_type, NULL_TREE);
6387 /* Now, build the function declaration. */
6388 push_lang_context (lang_name_c);
6389 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6390 mark_used (atexit_fndecl);
6391 pop_lang_context ();
6392 atexit_node = decay_conversion (atexit_fndecl);
6397 /* Returns the __dso_handle VAR_DECL. */
6400 get_dso_handle_node (void)
6402 if (dso_handle_node)
6403 return dso_handle_node;
6405 /* Declare the variable. */
6406 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6409 return dso_handle_node;
6412 /* Begin a new function with internal linkage whose job will be simply
6413 to destroy some particular variable. */
6415 static GTY(()) int start_cleanup_cnt;
6418 start_cleanup_fn (void)
6423 bool use_cxa_atexit = flag_use_cxa_atexit
6424 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6426 push_to_top_level ();
6428 /* No need to mangle this. */
6429 push_lang_context (lang_name_c);
6431 /* Build the name of the function. */
6432 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6433 /* Build the function declaration. */
6434 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6435 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6436 /* It's a function with internal linkage, generated by the
6438 TREE_PUBLIC (fndecl) = 0;
6439 DECL_ARTIFICIAL (fndecl) = 1;
6440 /* Make the function `inline' so that it is only emitted if it is
6441 actually needed. It is unlikely that it will be inlined, since
6442 it is only called via a function pointer, but we avoid unnecessary
6443 emissions this way. */
6444 DECL_DECLARED_INLINE_P (fndecl) = 1;
6445 DECL_INTERFACE_KNOWN (fndecl) = 1;
6446 /* Build the parameter. */
6451 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6452 DECL_CONTEXT (parmdecl) = fndecl;
6453 TREE_USED (parmdecl) = 1;
6454 DECL_READ_P (parmdecl) = 1;
6455 DECL_ARGUMENTS (fndecl) = parmdecl;
6459 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6461 pop_lang_context ();
6463 return current_function_decl;
6466 /* Finish the cleanup function begun by start_cleanup_fn. */
6469 end_cleanup_fn (void)
6471 expand_or_defer_fn (finish_function (0));
6473 pop_from_top_level ();
6476 /* Generate code to handle the destruction of DECL, an object with
6477 static storage duration. */
6480 register_dtor_fn (tree decl)
6487 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6489 type = TREE_TYPE (decl);
6490 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6491 return void_zero_node;
6493 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6494 a class object, we can just pass the destructor to
6495 "__cxa_atexit"; we don't have to build a temporary function to do
6497 use_dtor = (flag_use_cxa_atexit
6498 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6499 && CLASS_TYPE_P (type));
6504 /* Find the destructor. */
6505 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6506 gcc_assert (idx >= 0);
6507 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6508 /* Make sure it is accessible. */
6509 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6513 /* Call build_cleanup before we enter the anonymous function so
6514 that any access checks will be done relative to the current
6515 scope, rather than the scope of the anonymous function. */
6516 build_cleanup (decl);
6518 /* Now start the function. */
6519 cleanup = start_cleanup_fn ();
6521 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6522 to the original function, rather than the anonymous one. That
6523 will make the back end think that nested functions are in use,
6524 which causes confusion. */
6525 push_deferring_access_checks (dk_no_check);
6526 fcall = build_cleanup (decl);
6527 pop_deferring_access_checks ();
6529 /* Create the body of the anonymous function. */
6530 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6531 finish_expr_stmt (fcall);
6532 finish_compound_stmt (compound_stmt);
6536 /* Call atexit with the cleanup function. */
6537 mark_used (cleanup);
6538 cleanup = build_address (cleanup);
6539 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6545 /* We must convert CLEANUP to the type that "__cxa_atexit"
6547 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6548 /* "__cxa_atexit" will pass the address of DECL to the
6549 cleanup function. */
6551 addr = build_address (decl);
6552 /* The declared type of the parameter to "__cxa_atexit" is
6553 "void *". For plain "T*", we could just let the
6554 machinery in cp_build_function_call convert it -- but if the
6555 type is "cv-qualified T *", then we need to convert it
6556 before passing it in, to avoid spurious errors. */
6557 addr = build_nop (ptr_type_node, addr);
6560 /* Since the cleanup functions we build ignore the address
6561 they're given, there's no reason to pass the actual address
6562 in, and, in general, it's cheaper to pass NULL than any
6564 addr = null_pointer_node;
6565 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6566 tf_warning_or_error);
6567 if (targetm.cxx.use_aeabi_atexit ())
6580 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6581 arg0, arg1, arg2, NULL_TREE);
6584 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6585 is its initializer. Generate code to handle the construction
6586 and destruction of DECL. */
6589 expand_static_init (tree decl, tree init)
6591 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6592 gcc_assert (TREE_STATIC (decl));
6594 /* Some variables require no dynamic initialization. */
6596 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6599 if (DECL_FUNCTION_SCOPE_P (decl))
6601 /* Emit code to perform this initialization but once. */
6602 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6603 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6604 tree guard, guard_addr;
6605 tree acquire_fn, release_fn, abort_fn;
6608 /* Emit code to perform this initialization but once. This code
6611 static <type> guard;
6612 if (!guard.first_byte) {
6613 if (__cxa_guard_acquire (&guard)) {
6616 // Do initialization.
6617 flag = true; __cxa_guard_release (&guard);
6618 // Register variable for destruction at end of program.
6620 if (!flag) __cxa_guard_abort (&guard);
6624 Note that the `flag' variable is only set to 1 *after* the
6625 initialization is complete. This ensures that an exception,
6626 thrown during the construction, will cause the variable to
6627 reinitialized when we pass through this code again, as per:
6631 If the initialization exits by throwing an exception, the
6632 initialization is not complete, so it will be tried again
6633 the next time control enters the declaration.
6635 This process should be thread-safe, too; multiple threads
6636 should not be able to initialize the variable more than
6639 /* Create the guard variable. */
6640 guard = get_guard (decl);
6642 /* This optimization isn't safe on targets with relaxed memory
6643 consistency. On such targets we force synchronization in
6644 __cxa_guard_acquire. */
6645 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6647 /* Begin the conditional initialization. */
6648 if_stmt = begin_if_stmt ();
6649 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6650 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6653 if (flag_threadsafe_statics)
6655 guard_addr = build_address (guard);
6657 acquire_fn = get_identifier ("__cxa_guard_acquire");
6658 release_fn = get_identifier ("__cxa_guard_release");
6659 abort_fn = get_identifier ("__cxa_guard_abort");
6660 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6662 tree vfntype = build_function_type_list (void_type_node,
6663 TREE_TYPE (guard_addr),
6665 acquire_fn = push_library_fn
6666 (acquire_fn, build_function_type_list (integer_type_node,
6667 TREE_TYPE (guard_addr),
6670 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6671 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6675 release_fn = identifier_global_value (release_fn);
6676 abort_fn = identifier_global_value (abort_fn);
6679 inner_if_stmt = begin_if_stmt ();
6680 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6683 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6684 begin = get_target_expr (boolean_false_node);
6685 flag = TARGET_EXPR_SLOT (begin);
6687 TARGET_EXPR_CLEANUP (begin)
6688 = build3 (COND_EXPR, void_type_node, flag,
6690 build_call_n (abort_fn, 1, guard_addr));
6691 CLEANUP_EH_ONLY (begin) = 1;
6693 /* Do the initialization itself. */
6694 init = add_stmt_to_compound (begin, init);
6695 init = add_stmt_to_compound
6696 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6697 init = add_stmt_to_compound
6698 (init, build_call_n (release_fn, 1, guard_addr));
6701 init = add_stmt_to_compound (init, set_guard (guard));
6703 /* Use atexit to register a function for destroying this static
6705 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6707 finish_expr_stmt (init);
6709 if (flag_threadsafe_statics)
6711 finish_compound_stmt (inner_then_clause);
6712 finish_then_clause (inner_if_stmt);
6713 finish_if_stmt (inner_if_stmt);
6716 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6718 finish_compound_stmt (then_clause);
6719 finish_then_clause (if_stmt);
6720 finish_if_stmt (if_stmt);
6724 static_aggregates = tree_cons (init, decl, static_aggregates);
6728 /* Make TYPE a complete type based on INITIAL_VALUE.
6729 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6730 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6731 3 if the initializer list is empty (in pedantic mode). */
6734 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6737 tree type, elt_type;
6741 unsigned HOST_WIDE_INT i;
6744 /* An array of character type can be initialized from a
6745 brace-enclosed string constant.
6747 FIXME: this code is duplicated from reshape_init. Probably
6748 we should just call reshape_init here? */
6749 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6750 && TREE_CODE (initial_value) == CONSTRUCTOR
6751 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6753 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6754 tree value = VEC_index (constructor_elt, v, 0)->value;
6756 if (TREE_CODE (value) == STRING_CST
6757 && VEC_length (constructor_elt, v) == 1)
6758 initial_value = value;
6761 /* If any of the elements are parameter packs, we can't actually
6762 complete this type now because the array size is dependent. */
6763 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6765 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6768 if (PACK_EXPANSION_P (value))
6774 failure = complete_array_type (ptype, initial_value, do_default);
6776 /* We can create the array before the element type is complete, which
6777 means that we didn't have these two bits set in the original type
6778 either. In completing the type, we are expected to propagate these
6779 bits. See also complete_type which does the same thing for arrays
6782 if (TYPE_DOMAIN (type))
6784 elt_type = TREE_TYPE (type);
6785 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6786 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6787 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6793 /* As above, but either give an error or reject zero-size arrays, depending
6797 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6798 bool do_default, tsubst_flags_t complain)
6801 bool sfinae = !(complain & tf_error);
6802 /* In SFINAE context we can't be lenient about zero-size arrays. */
6805 failure = cp_complete_array_type (ptype, initial_value, do_default);
6811 /* Not an error. */;
6812 else if (failure == 1)
6813 error ("initializer fails to determine size of %qT", *ptype);
6814 else if (failure == 2)
6817 error ("array size missing in %qT", *ptype);
6819 else if (failure == 3)
6820 error ("zero-size array %qT", *ptype);
6821 *ptype = error_mark_node;
6826 /* Return zero if something is declared to be a member of type
6827 CTYPE when in the context of CUR_TYPE. STRING is the error
6828 message to print in that case. Otherwise, quietly return 1. */
6831 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6833 if (ctype && ctype != cur_type)
6835 if (flags == DTOR_FLAG)
6836 error ("destructor for alien class %qT cannot be a member", ctype);
6838 error ("constructor for alien class %qT cannot be a member", ctype);
6844 /* Subroutine of `grokdeclarator'. */
6846 /* Generate errors possibly applicable for a given set of specifiers.
6847 This is for ARM $7.1.2. */
6850 bad_specifiers (tree object,
6851 enum bad_spec_place type,
6862 error ("%qD declared as a %<virtual%> variable", object);
6864 error ("%qD declared as an %<inline%> variable", object);
6866 error ("%<const%> and %<volatile%> function specifiers on "
6867 "%qD invalid in variable declaration", object);
6871 error ("%qD declared as a %<virtual%> parameter", object);
6873 error ("%qD declared as an %<inline%> parameter", object);
6875 error ("%<const%> and %<volatile%> function specifiers on "
6876 "%qD invalid in parameter declaration", object);
6880 error ("%qD declared as a %<virtual%> type", object);
6882 error ("%qD declared as an %<inline%> type", object);
6884 error ("%<const%> and %<volatile%> function specifiers on "
6885 "%qD invalid in type declaration", object);
6889 error ("%qD declared as a %<virtual%> field", object);
6891 error ("%qD declared as an %<inline%> field", object);
6893 error ("%<const%> and %<volatile%> function specifiers on "
6894 "%qD invalid in field declaration", object);
6900 error ("%q+D declared as a friend", object);
6902 && (TREE_CODE (object) == TYPE_DECL
6903 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6904 && !TYPE_REFFN_P (TREE_TYPE (object))
6905 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6906 error ("%q+D declared with an exception specification", object);
6909 /* DECL is a member function or static data member and is presently
6910 being defined. Check that the definition is taking place in a
6914 check_class_member_definition_namespace (tree decl)
6916 /* These checks only apply to member functions and static data
6918 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6919 || TREE_CODE (decl) == VAR_DECL);
6920 /* We check for problems with specializations in pt.c in
6921 check_specialization_namespace, where we can issue better
6923 if (processing_specialization)
6925 /* There are no restrictions on the placement of
6926 explicit instantiations. */
6927 if (processing_explicit_instantiation)
6931 A member function definition that appears outside of the
6932 class definition shall appear in a namespace scope enclosing
6933 the class definition.
6937 The definition for a static data member shall appear in a
6938 namespace scope enclosing the member's class definition. */
6939 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6940 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6941 decl, DECL_CONTEXT (decl));
6944 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6945 METHOD_TYPE for a non-static member function; QUALS are the
6946 cv-qualifiers that apply to the function. */
6949 build_this_parm (tree type, cp_cv_quals quals)
6954 cp_cv_quals this_quals;
6956 this_type = type_of_this_parm (type);
6957 /* The `this' parameter is implicitly `const'; it cannot be
6959 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6960 qual_type = cp_build_qualified_type (this_type, this_quals);
6961 parm = build_artificial_parm (this_identifier, qual_type);
6962 cp_apply_type_quals_to_decl (this_quals, parm);
6966 /* CTYPE is class type, or null if non-class.
6967 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6969 DECLARATOR is the function's name.
6970 PARMS is a chain of PARM_DECLs for the function.
6971 VIRTUALP is truthvalue of whether the function is virtual or not.
6972 FLAGS are to be passed through to `grokclassfn'.
6973 QUALS are qualifiers indicating whether the function is `const'
6975 RAISES is a list of exceptions that this function can raise.
6976 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6977 not look, and -1 if we should not call `grokclassfn' at all.
6979 SFK is the kind of special function (if any) for the new function.
6981 Returns `NULL_TREE' if something goes wrong, after issuing
6982 applicable error messages. */
6985 grokfndecl (tree ctype,
6989 tree orig_declarator,
6991 enum overload_flags flags,
6998 special_function_kind sfk,
7003 location_t location)
7006 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7010 type = build_exception_variant (type, raises);
7012 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7014 /* If we have an explicit location, use it, otherwise use whatever
7015 build_lang_decl used (probably input_location). */
7016 if (location != UNKNOWN_LOCATION)
7017 DECL_SOURCE_LOCATION (decl) = location;
7019 if (TREE_CODE (type) == METHOD_TYPE)
7022 parm = build_this_parm (type, quals);
7023 DECL_CHAIN (parm) = parms;
7026 DECL_ARGUMENTS (decl) = parms;
7027 for (t = parms; t; t = DECL_CHAIN (t))
7028 DECL_CONTEXT (t) = decl;
7029 /* Propagate volatile out from type to decl. */
7030 if (TYPE_VOLATILE (type))
7031 TREE_THIS_VOLATILE (decl) = 1;
7033 /* Setup decl according to sfk. */
7036 case sfk_constructor:
7037 case sfk_copy_constructor:
7038 case sfk_move_constructor:
7039 DECL_CONSTRUCTOR_P (decl) = 1;
7041 case sfk_destructor:
7042 DECL_DESTRUCTOR_P (decl) = 1;
7048 /* If pointers to member functions use the least significant bit to
7049 indicate whether a function is virtual, ensure a pointer
7050 to this function will have that bit clear. */
7051 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7052 && TREE_CODE (type) == METHOD_TYPE
7053 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7054 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7057 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7061 ("defining explicit specialization %qD in friend declaration",
7065 tree fns = TREE_OPERAND (orig_declarator, 0);
7066 tree args = TREE_OPERAND (orig_declarator, 1);
7068 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7070 /* Something like `template <class T> friend void f<T>()'. */
7071 error ("invalid use of template-id %qD in declaration "
7072 "of primary template",
7078 /* A friend declaration of the form friend void f<>(). Record
7079 the information in the TEMPLATE_ID_EXPR. */
7080 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7082 if (TREE_CODE (fns) == COMPONENT_REF)
7084 /* Due to bison parser ickiness, we will have already looked
7085 up an operator_name or PFUNCNAME within the current class
7086 (see template_id in parse.y). If the current class contains
7087 such a name, we'll get a COMPONENT_REF here. Undo that. */
7089 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7090 == current_class_type);
7091 fns = TREE_OPERAND (fns, 1);
7093 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7094 || TREE_CODE (fns) == OVERLOAD);
7095 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7097 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7098 if (TREE_PURPOSE (t)
7099 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7101 error ("default arguments are not allowed in declaration "
7102 "of friend template specialization %qD",
7109 error ("%<inline%> is not allowed in declaration of friend "
7110 "template specialization %qD",
7117 /* If this decl has namespace scope, set that up. */
7119 set_decl_namespace (decl, in_namespace, friendp);
7121 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7123 /* `main' and builtins have implicit 'C' linkage. */
7124 if ((MAIN_NAME_P (declarator)
7125 || (IDENTIFIER_LENGTH (declarator) > 10
7126 && IDENTIFIER_POINTER (declarator)[0] == '_'
7127 && IDENTIFIER_POINTER (declarator)[1] == '_'
7128 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7129 && current_lang_name == lang_name_cplusplus
7130 && ctype == NULL_TREE
7131 && DECL_FILE_SCOPE_P (decl))
7132 SET_DECL_LANGUAGE (decl, lang_c);
7134 /* Should probably propagate const out from type to decl I bet (mrs). */
7137 DECL_STATIC_FUNCTION_P (decl) = 1;
7138 DECL_CONTEXT (decl) = ctype;
7143 DECL_CONTEXT (decl) = ctype;
7145 check_class_member_definition_namespace (decl);
7148 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7150 if (processing_template_decl)
7151 error ("cannot declare %<::main%> to be a template");
7153 error ("cannot declare %<::main%> to be inline");
7155 error ("cannot declare %<::main%> to be static");
7160 /* Members of anonymous types and local classes have no linkage; make
7161 them internal. If a typedef is made later, this will be changed. */
7162 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7163 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7166 if (publicp && cxx_dialect == cxx98)
7168 /* [basic.link]: A name with no linkage (notably, the name of a class
7169 or enumeration declared in a local scope) shall not be used to
7170 declare an entity with linkage.
7172 DR 757 relaxes this restriction for C++0x. */
7173 t = no_linkage_check (TREE_TYPE (decl),
7174 /*relaxed_p=*/false);
7177 if (TYPE_ANONYMOUS_P (t))
7179 if (DECL_EXTERN_C_P (decl))
7180 /* Allow this; it's pretty common in C. */;
7183 permerror (input_location, "anonymous type with no linkage "
7184 "used to declare function %q#D with linkage",
7186 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7187 permerror (input_location, "%q+#D does not refer to the unqualified "
7188 "type, so it is not used for linkage",
7193 permerror (input_location, "type %qT with no linkage used to "
7194 "declare function %q#D with linkage", t, decl);
7198 TREE_PUBLIC (decl) = publicp;
7201 DECL_INTERFACE_KNOWN (decl) = 1;
7202 DECL_NOT_REALLY_EXTERN (decl) = 1;
7205 /* If the declaration was declared inline, mark it as such. */
7207 DECL_DECLARED_INLINE_P (decl) = 1;
7209 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7211 DECL_EXTERNAL (decl) = 1;
7212 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7215 ? G_("static member function %qD cannot have cv-qualifier")
7216 : G_("non-member function %qD cannot have cv-qualifier"),
7218 quals = TYPE_UNQUALIFIED;
7221 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7222 && !grok_op_properties (decl, /*complain=*/true))
7226 /* Make the init_value nonzero so pushdecl knows this is not
7227 tentative. error_mark_node is replaced later with the BLOCK. */
7228 DECL_INITIAL (decl) = error_mark_node;
7230 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7231 TREE_NOTHROW (decl) = 1;
7233 /* Caller will do the rest of this. */
7237 if (ctype != NULL_TREE)
7238 grokclassfn (ctype, decl, flags);
7240 decl = check_explicit_specialization (orig_declarator, decl,
7243 4 * (friendp != 0));
7244 if (decl == error_mark_node)
7249 cplus_decl_attributes (&decl, *attrlist, 0);
7250 *attrlist = NULL_TREE;
7253 /* Check main's type after attributes have been applied. */
7254 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7256 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7259 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7261 error ("%<::main%> must return %<int%>");
7262 newtype = build_function_type (integer_type_node, oldtypeargs);
7263 TREE_TYPE (decl) = newtype;
7266 check_main_parameter_types (decl);
7269 if (ctype != NULL_TREE
7270 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7273 tree old_decl = check_classfn (ctype, decl,
7274 (processing_template_decl
7275 > template_class_depth (ctype))
7276 ? current_template_parms
7279 if (old_decl == error_mark_node)
7287 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7288 /* Because grokfndecl is always supposed to return a
7289 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7290 here. We depend on our callers to figure out that its
7291 really a template that's being returned. */
7292 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7294 if (DECL_STATIC_FUNCTION_P (old_decl)
7295 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7296 /* Remove the `this' parm added by grokclassfn.
7297 XXX Isn't this done in start_function, too? */
7298 revert_static_member_fn (decl);
7299 if (DECL_ARTIFICIAL (old_decl))
7301 error ("definition of implicitly-declared %qD", old_decl);
7305 /* Since we've smashed OLD_DECL to its
7306 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7307 if (TREE_CODE (decl) == TEMPLATE_DECL)
7308 decl = DECL_TEMPLATE_RESULT (decl);
7310 /* Attempt to merge the declarations. This can fail, in
7311 the case of some invalid specialization declarations. */
7312 pushed_scope = push_scope (ctype);
7313 ok = duplicate_decls (decl, old_decl, friendp);
7315 pop_scope (pushed_scope);
7318 error ("no %q#D member function declared in class %qT",
7326 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7329 if (ctype == NULL_TREE || check)
7333 DECL_VIRTUAL_P (decl) = 1;
7338 /* decl is a FUNCTION_DECL.
7339 specifiers are the parsed virt-specifiers.
7341 Set flags to reflect the virt-specifiers.
7346 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7348 if (decl == NULL_TREE)
7350 if (specifiers & VIRT_SPEC_OVERRIDE)
7351 DECL_OVERRIDE_P (decl) = 1;
7352 if (specifiers & VIRT_SPEC_FINAL)
7353 DECL_FINAL_P (decl) = 1;
7357 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7358 the linkage that DECL will receive in the object file. */
7361 set_linkage_for_static_data_member (tree decl)
7363 /* A static data member always has static storage duration and
7364 external linkage. Note that static data members are forbidden in
7365 local classes -- the only situation in which a class has
7366 non-external linkage. */
7367 TREE_PUBLIC (decl) = 1;
7368 TREE_STATIC (decl) = 1;
7369 /* For non-template classes, static data members are always put
7370 out in exactly those files where they are defined, just as
7371 with ordinary namespace-scope variables. */
7372 if (!processing_template_decl)
7373 DECL_INTERFACE_KNOWN (decl) = 1;
7376 /* Create a VAR_DECL named NAME with the indicated TYPE.
7378 If SCOPE is non-NULL, it is the class type or namespace containing
7379 the variable. If SCOPE is NULL, the variable should is created in
7380 the innermost enclosings scope. */
7383 grokvardecl (tree type,
7385 const cp_decl_specifier_seq *declspecs,
7391 tree explicit_scope;
7393 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7395 /* Compute the scope in which to place the variable, but remember
7396 whether or not that scope was explicitly specified by the user. */
7397 explicit_scope = scope;
7400 /* An explicit "extern" specifier indicates a namespace-scope
7402 if (declspecs->storage_class == sc_extern)
7403 scope = current_decl_namespace ();
7404 else if (!at_function_scope_p ())
7405 scope = current_scope ();
7409 && (/* If the variable is a namespace-scope variable declared in a
7410 template, we need DECL_LANG_SPECIFIC. */
7411 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7412 /* Similarly for namespace-scope variables with language linkage
7414 || (TREE_CODE (scope) == NAMESPACE_DECL
7415 && current_lang_name != lang_name_cplusplus)
7416 /* Similarly for static data members. */
7418 decl = build_lang_decl (VAR_DECL, name, type);
7420 decl = build_decl (input_location, VAR_DECL, name, type);
7422 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7423 set_decl_namespace (decl, explicit_scope, 0);
7425 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7427 if (declspecs->storage_class == sc_extern)
7429 DECL_THIS_EXTERN (decl) = 1;
7430 DECL_EXTERNAL (decl) = !initialized;
7433 if (DECL_CLASS_SCOPE_P (decl))
7435 set_linkage_for_static_data_member (decl);
7436 /* This function is only called with out-of-class definitions. */
7437 DECL_EXTERNAL (decl) = 0;
7438 check_class_member_definition_namespace (decl);
7440 /* At top level, either `static' or no s.c. makes a definition
7441 (perhaps tentative), and absence of `static' makes it public. */
7442 else if (toplevel_bindings_p ())
7444 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7445 && (DECL_THIS_EXTERN (decl) || ! constp));
7446 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7448 /* Not at top level, only `static' makes a static definition. */
7451 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7452 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7455 if (declspecs->specs[(int)ds_thread])
7456 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7458 /* If the type of the decl has no linkage, make sure that we'll
7459 notice that in mark_used. */
7460 if (cxx_dialect > cxx98
7461 && decl_linkage (decl) != lk_none
7462 && DECL_LANG_SPECIFIC (decl) == NULL
7463 && !DECL_EXTERN_C_P (decl)
7464 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7465 retrofit_lang_decl (decl);
7467 if (TREE_PUBLIC (decl))
7469 /* [basic.link]: A name with no linkage (notably, the name of a class
7470 or enumeration declared in a local scope) shall not be used to
7471 declare an entity with linkage.
7473 DR 757 relaxes this restriction for C++0x. */
7474 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7475 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7478 if (TYPE_ANONYMOUS_P (t))
7480 if (DECL_EXTERN_C_P (decl))
7481 /* Allow this; it's pretty common in C. */
7485 /* DRs 132, 319 and 389 seem to indicate types with
7486 no linkage can only be used to declare extern "C"
7487 entities. Since it's not always an error in the
7488 ISO C++ 90 Standard, we only issue a warning. */
7489 warning (0, "anonymous type with no linkage used to declare "
7490 "variable %q#D with linkage", decl);
7491 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7492 warning (0, "%q+#D does not refer to the unqualified "
7493 "type, so it is not used for linkage",
7498 warning (0, "type %qT with no linkage used to declare variable "
7499 "%q#D with linkage", t, decl);
7503 DECL_INTERFACE_KNOWN (decl) = 1;
7508 /* Create and return a canonical pointer to member function type, for
7509 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7512 build_ptrmemfunc_type (tree type)
7516 tree unqualified_variant = NULL_TREE;
7518 if (type == error_mark_node)
7521 /* If a canonical type already exists for this type, use it. We use
7522 this method instead of type_hash_canon, because it only does a
7523 simple equality check on the list of field members. */
7525 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7528 /* Make sure that we always have the unqualified pointer-to-member
7530 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7532 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7534 t = make_class_type (RECORD_TYPE);
7535 xref_basetypes (t, NULL_TREE);
7537 /* Let the front end know this is a pointer to member function... */
7538 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7539 /* ... and not really a class type. */
7540 SET_CLASS_TYPE_P (t, 0);
7542 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7545 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7547 DECL_CHAIN (field) = fields;
7550 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7552 /* Zap out the name so that the back end will give us the debugging
7553 information for this anonymous RECORD_TYPE. */
7554 TYPE_NAME (t) = NULL_TREE;
7556 /* If this is not the unqualified form of this pointer-to-member
7557 type, set the TYPE_MAIN_VARIANT for this type to be the
7558 unqualified type. Since they are actually RECORD_TYPEs that are
7559 not variants of each other, we must do this manually.
7560 As we just built a new type there is no need to do yet another copy. */
7561 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7563 int type_quals = cp_type_quals (type);
7564 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7565 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7566 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7567 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7568 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7569 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7570 TREE_TYPE (TYPE_BINFO (t)) = t;
7573 /* Cache this pointer-to-member type so that we can find it again
7575 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7577 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7578 SET_TYPE_STRUCTURAL_EQUALITY (t);
7579 else if (TYPE_CANONICAL (type) != type)
7580 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7585 /* Create and return a pointer to data member type. */
7588 build_ptrmem_type (tree class_type, tree member_type)
7590 if (TREE_CODE (member_type) == METHOD_TYPE)
7592 cp_cv_quals quals = type_memfn_quals (member_type);
7593 member_type = build_memfn_type (member_type, class_type, quals);
7594 return build_ptrmemfunc_type (build_pointer_type (member_type));
7598 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7599 return build_offset_type (class_type, member_type);
7603 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7604 Check to see that the definition is valid. Issue appropriate error
7605 messages. Return 1 if the definition is particularly bad, or 0
7609 check_static_variable_definition (tree decl, tree type)
7611 /* If DECL is declared constexpr, we'll do the appropriate checks
7612 in check_initializer. */
7613 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7615 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7617 if (literal_type_p (type))
7618 error ("%<constexpr%> needed for in-class initialization of static "
7619 "data member %q#D of non-integral type", decl);
7621 error ("in-class initialization of static data member %q#D of "
7622 "non-literal type", decl);
7626 /* Motion 10 at San Diego: If a static const integral data member is
7627 initialized with an integral constant expression, the initializer
7628 may appear either in the declaration (within the class), or in
7629 the definition, but not both. If it appears in the class, the
7630 member is a member constant. The file-scope definition is always
7632 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7634 error ("invalid in-class initialization of static data member "
7635 "of non-integral type %qT",
7639 else if (!CP_TYPE_CONST_P (type))
7640 error ("ISO C++ forbids in-class initialization of non-const "
7641 "static member %qD",
7643 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7644 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7645 "%qD of non-integral type %qT", decl, type);
7650 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7651 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7652 expressions out into temporary variables so that walk_tree doesn't
7653 step into them (c++/15764). */
7656 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7658 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7659 tree expr = *expr_p;
7660 if (TREE_CODE (expr) == SAVE_EXPR)
7662 tree op = TREE_OPERAND (expr, 0);
7663 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7664 if (TREE_SIDE_EFFECTS (op))
7665 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7668 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7673 /* Entry point for the above. */
7676 stabilize_vla_size (tree size)
7678 struct pointer_set_t *pset = pointer_set_create ();
7679 /* Break out any function calls into temporary variables. */
7680 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7683 /* Given the SIZE (i.e., number of elements) in an array, compute an
7684 appropriate index type for the array. If non-NULL, NAME is the
7685 name of the thing being declared. */
7688 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7693 tree abi_1_itype = NULL_TREE;
7695 if (error_operand_p (size))
7696 return error_mark_node;
7698 type = TREE_TYPE (size);
7699 /* type_dependent_expression_p? */
7700 if (!dependent_type_p (type))
7702 mark_rvalue_use (size);
7704 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7705 && TREE_SIDE_EFFECTS (size))
7706 /* In C++98, we mark a non-constant array bound with a magic
7707 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7710 size = fold_non_dependent_expr (size);
7712 if (CLASS_TYPE_P (type)
7713 && CLASSTYPE_LITERAL_P (type))
7715 size = build_expr_type_conversion (WANT_INT, size, true);
7718 if (!(complain & tf_error))
7719 return error_mark_node;
7721 error ("size of array %qD has non-integral type %qT",
7724 error ("size of array has non-integral type %qT", type);
7725 size = integer_one_node;
7727 if (size == error_mark_node)
7728 return error_mark_node;
7729 type = TREE_TYPE (size);
7730 /* We didn't support this case in GCC 3.2, so don't bother
7731 trying to model it now in ABI v1. */
7732 abi_1_itype = error_mark_node;
7735 size = maybe_constant_value (size);
7736 if (!TREE_CONSTANT (size))
7740 if (error_operand_p (size))
7741 return error_mark_node;
7743 /* The array bound must be an integer type. */
7744 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7746 if (!(complain & tf_error))
7747 return error_mark_node;
7749 error ("size of array %qD has non-integral type %qT", name, type);
7751 error ("size of array has non-integral type %qT", type);
7752 size = integer_one_node;
7753 type = TREE_TYPE (size);
7757 /* A type is dependent if it is...an array type constructed from any
7758 dependent type or whose size is specified by a constant expression
7759 that is value-dependent. */
7760 /* We can only call value_dependent_expression_p on integral constant
7761 expressions; treat non-constant expressions as dependent, too. */
7762 if (processing_template_decl
7763 && (dependent_type_p (type)
7764 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7766 /* We cannot do any checking for a SIZE that isn't known to be
7767 constant. Just build the index type and mark that it requires
7768 structural equality checks. */
7769 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7770 size, integer_one_node));
7771 TYPE_DEPENDENT_P (itype) = 1;
7772 TYPE_DEPENDENT_P_VALID (itype) = 1;
7773 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7777 if (!abi_version_at_least (2) && processing_template_decl
7778 && abi_1_itype == NULL_TREE)
7779 /* For abi-1, we handled all instances in templates the same way,
7780 even when they were non-dependent. This affects the manglings
7781 produced. So, we do the normal checking for non-dependent
7782 sizes, but at the end we'll return the same type that abi-1
7783 would have, but with TYPE_CANONICAL set to the "right"
7784 value that the current ABI would provide. */
7785 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7786 osize, integer_one_node));
7788 /* Normally, the array-bound will be a constant. */
7789 if (TREE_CODE (size) == INTEGER_CST)
7791 /* Check to see if the array bound overflowed. Make that an
7792 error, no matter how generous we're being. */
7793 constant_expression_error (size);
7795 /* An array must have a positive number of elements. */
7796 if (INT_CST_LT (size, integer_zero_node))
7798 if (!(complain & tf_error))
7799 return error_mark_node;
7801 error ("size of array %qD is negative", name);
7803 error ("size of array is negative");
7804 size = integer_one_node;
7806 /* As an extension we allow zero-sized arrays. */
7807 else if (integer_zerop (size))
7809 if (!(complain & tf_error))
7810 /* We must fail if performing argument deduction (as
7811 indicated by the state of complain), so that
7812 another substitution can be found. */
7813 return error_mark_node;
7814 else if (in_system_header)
7815 /* Allow them in system headers because glibc uses them. */;
7817 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7819 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7822 else if (TREE_CONSTANT (size)
7823 /* We don't allow VLAs at non-function scopes, or during
7824 tentative template substitution. */
7825 || !at_function_scope_p () || !(complain & tf_error))
7827 if (!(complain & tf_error))
7828 return error_mark_node;
7829 /* `(int) &fn' is not a valid array bound. */
7831 error ("size of array %qD is not an integral constant-expression",
7834 error ("size of array is not an integral constant-expression");
7835 size = integer_one_node;
7837 else if (pedantic && warn_vla != 0)
7840 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7842 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7844 else if (warn_vla > 0)
7848 "variable length array %qD is used", name);
7851 "variable length array is used");
7854 if (processing_template_decl && !TREE_CONSTANT (size))
7855 /* A variable sized array. */
7856 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7859 HOST_WIDE_INT saved_processing_template_decl;
7861 /* Compute the index of the largest element in the array. It is
7862 one less than the number of elements in the array. We save
7863 and restore PROCESSING_TEMPLATE_DECL so that computations in
7864 cp_build_binary_op will be appropriately folded. */
7865 saved_processing_template_decl = processing_template_decl;
7866 processing_template_decl = 0;
7867 itype = cp_build_binary_op (input_location,
7869 cp_convert (ssizetype, size),
7870 cp_convert (ssizetype, integer_one_node),
7871 tf_warning_or_error);
7872 itype = fold (itype);
7873 processing_template_decl = saved_processing_template_decl;
7875 if (!TREE_CONSTANT (itype))
7876 /* A variable sized array. */
7877 itype = variable_size (itype);
7878 /* Make sure that there was no overflow when creating to a signed
7879 index type. (For example, on a 32-bit machine, an array with
7880 size 2^32 - 1 is too big.) */
7881 else if (TREE_CODE (itype) == INTEGER_CST
7882 && TREE_OVERFLOW (itype))
7884 if (!(complain & tf_error))
7885 return error_mark_node;
7886 error ("overflow in array dimension");
7887 TREE_OVERFLOW (itype) = 0;
7891 /* Create and return the appropriate index type. */
7892 if (abi_1_itype && abi_1_itype != error_mark_node)
7894 tree t = build_index_type (itype);
7895 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7896 itype = abi_1_itype;
7899 itype = build_index_type (itype);
7901 /* If the index type were dependent, we would have returned early, so
7902 remember that it isn't. */
7903 TYPE_DEPENDENT_P (itype) = 0;
7904 TYPE_DEPENDENT_P_VALID (itype) = 1;
7908 /* Returns the scope (if any) in which the entity declared by
7909 DECLARATOR will be located. If the entity was declared with an
7910 unqualified name, NULL_TREE is returned. */
7913 get_scope_of_declarator (const cp_declarator *declarator)
7915 while (declarator && declarator->kind != cdk_id)
7916 declarator = declarator->declarator;
7918 /* If the declarator-id is a SCOPE_REF, the scope in which the
7919 declaration occurs is the first operand. */
7921 && declarator->u.id.qualifying_scope)
7922 return declarator->u.id.qualifying_scope;
7924 /* Otherwise, the declarator is not a qualified name; the entity will
7925 be declared in the current scope. */
7929 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7930 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7934 create_array_type_for_decl (tree name, tree type, tree size)
7936 tree itype = NULL_TREE;
7938 /* If things have already gone awry, bail now. */
7939 if (type == error_mark_node || size == error_mark_node)
7940 return error_mark_node;
7942 /* If there are some types which cannot be array elements,
7943 issue an error-message and return. */
7944 switch (TREE_CODE (type))
7948 error ("declaration of %qD as array of void", name);
7950 error ("creating array of void");
7951 return error_mark_node;
7955 error ("declaration of %qD as array of functions", name);
7957 error ("creating array of functions");
7958 return error_mark_node;
7960 case REFERENCE_TYPE:
7962 error ("declaration of %qD as array of references", name);
7964 error ("creating array of references");
7965 return error_mark_node;
7969 error ("declaration of %qD as array of function members", name);
7971 error ("creating array of function members");
7972 return error_mark_node;
7980 The constant expressions that specify the bounds of the arrays
7981 can be omitted only for the first member of the sequence. */
7982 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7985 error ("declaration of %qD as multidimensional array must "
7986 "have bounds for all dimensions except the first",
7989 error ("multidimensional array must have bounds for all "
7990 "dimensions except the first");
7992 return error_mark_node;
7995 /* Figure out the index type for the array. */
7997 itype = compute_array_index_type (name, size, tf_warning_or_error);
8000 T is called the array element type; this type shall not be [...] an
8001 abstract class type. */
8002 abstract_virtuals_error (name, type);
8004 return build_cplus_array_type (type, itype);
8007 /* Check that it's OK to declare a function with the indicated TYPE.
8008 SFK indicates the kind of special function (if any) that this
8009 function is. OPTYPE is the type given in a conversion operator
8010 declaration, or the class type for a constructor/destructor.
8011 Returns the actual return type of the function; that
8012 may be different than TYPE if an error occurs, or for certain
8013 special functions. */
8016 check_special_function_return_type (special_function_kind sfk,
8022 case sfk_constructor:
8024 error ("return type specification for constructor invalid");
8026 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8027 type = build_pointer_type (optype);
8029 type = void_type_node;
8032 case sfk_destructor:
8034 error ("return type specification for destructor invalid");
8035 /* We can't use the proper return type here because we run into
8036 problems with ambiguous bases and covariant returns.
8037 Java classes are left unchanged because (void *) isn't a valid
8038 Java type, and we don't want to change the Java ABI. */
8039 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8040 type = build_pointer_type (void_type_node);
8042 type = void_type_node;
8045 case sfk_conversion:
8047 error ("return type specified for %<operator %T%>", optype);
8058 /* A variable or data member (whose unqualified name is IDENTIFIER)
8059 has been declared with the indicated TYPE. If the TYPE is not
8060 acceptable, issue an error message and return a type to use for
8061 error-recovery purposes. */
8064 check_var_type (tree identifier, tree type)
8066 if (VOID_TYPE_P (type))
8069 error ("unnamed variable or field declared void");
8070 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8072 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8073 error ("variable or field %qE declared void", identifier);
8076 error ("variable or field declared void");
8077 type = error_mark_node;
8083 /* Given declspecs and a declarator (abstract or otherwise), determine
8084 the name and type of the object declared and construct a DECL node
8087 DECLSPECS points to the representation of declaration-specifier
8088 sequence that precedes declarator.
8090 DECL_CONTEXT says which syntactic context this declaration is in:
8091 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8092 FUNCDEF for a function definition. Like NORMAL but a few different
8093 error messages in each case. Return value may be zero meaning
8094 this definition is too screwy to try to parse.
8095 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8096 handle member functions (which have FIELD context).
8097 Return value may be zero meaning this definition is too screwy to
8099 PARM for a parameter declaration (either within a function prototype
8100 or before a function body). Make a PARM_DECL, or return void_type_node.
8101 TPARM for a template parameter declaration.
8102 CATCHPARM for a parameter declaration before a catch clause.
8103 TYPENAME if for a typename (in a cast or sizeof).
8104 Don't make a DECL node; just return the ..._TYPE node.
8105 FIELD for a struct or union field; make a FIELD_DECL.
8106 BITFIELD for a field with specified width.
8108 INITIALIZED is as for start_decl.
8110 ATTRLIST is a pointer to the list of attributes, which may be NULL
8111 if there are none; *ATTRLIST may be modified if attributes from inside
8112 the declarator should be applied to the declaration.
8114 When this function is called, scoping variables (such as
8115 CURRENT_CLASS_TYPE) should reflect the scope in which the
8116 declaration occurs, not the scope in which the new declaration will
8117 be placed. For example, on:
8121 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8124 Returns a DECL (if a declarator is present), a TYPE (if there is no
8125 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8129 grokdeclarator (const cp_declarator *declarator,
8130 const cp_decl_specifier_seq *declspecs,
8131 enum decl_context decl_context,
8135 tree type = NULL_TREE;
8137 int explicit_int128 = 0;
8138 int virtualp, explicitp, friendp, inlinep, staticp;
8139 int explicit_int = 0;
8140 int explicit_char = 0;
8141 int defaulted_int = 0;
8142 tree dependent_name = NULL_TREE;
8144 tree typedef_decl = NULL_TREE;
8145 const char *name = NULL;
8146 tree typedef_type = NULL_TREE;
8147 /* True if this declarator is a function definition. */
8148 bool funcdef_flag = false;
8149 cp_declarator_kind innermost_code = cdk_error;
8152 /* See the code below that used this. */
8153 tree decl_attr = NULL_TREE;
8156 /* Keep track of what sort of function is being processed
8157 so that we can warn about default return values, or explicit
8158 return values which do not match prescribed defaults. */
8159 special_function_kind sfk = sfk_none;
8161 tree dname = NULL_TREE;
8162 tree ctor_return_type = NULL_TREE;
8163 enum overload_flags flags = NO_SPECIAL;
8164 /* cv-qualifiers that apply to the declarator, for a declaration of
8165 a member function. */
8166 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8167 /* virt-specifiers that apply to the declarator, for a declaration of
8168 a member function. */
8169 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8170 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8172 tree raises = NULL_TREE;
8173 int template_count = 0;
8174 tree returned_attrs = NULL_TREE;
8175 tree parms = NULL_TREE;
8176 const cp_declarator *id_declarator;
8177 /* The unqualified name of the declarator; either an
8178 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8179 tree unqualified_id;
8180 /* The class type, if any, in which this entity is located,
8181 or NULL_TREE if none. Note that this value may be different from
8182 the current class type; for example if an attempt is made to declare
8183 "A::f" inside "B", this value will be "A". */
8184 tree ctype = current_class_type;
8185 /* The NAMESPACE_DECL for the namespace in which this entity is
8186 located. If an unqualified name is used to declare the entity,
8187 this value will be NULL_TREE, even if the entity is located at
8189 tree in_namespace = NULL_TREE;
8190 cp_storage_class storage_class;
8191 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8192 bool type_was_error_mark_node = false;
8193 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8194 bool template_type_arg = false;
8195 bool template_parm_flag = false;
8196 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8199 signed_p = declspecs->specs[(int)ds_signed];
8200 unsigned_p = declspecs->specs[(int)ds_unsigned];
8201 short_p = declspecs->specs[(int)ds_short];
8202 long_p = declspecs->specs[(int)ds_long];
8203 longlong = declspecs->specs[(int)ds_long] >= 2;
8204 explicit_int128 = declspecs->explicit_int128_p;
8205 thread_p = declspecs->specs[(int)ds_thread];
8207 if (decl_context == FUNCDEF)
8208 funcdef_flag = true, decl_context = NORMAL;
8209 else if (decl_context == MEMFUNCDEF)
8210 funcdef_flag = true, decl_context = FIELD;
8211 else if (decl_context == BITFIELD)
8212 bitfield = 1, decl_context = FIELD;
8213 else if (decl_context == TEMPLATE_TYPE_ARG)
8214 template_type_arg = true, decl_context = TYPENAME;
8215 else if (decl_context == TPARM)
8216 template_parm_flag = true, decl_context = PARM;
8218 if (initialized > 1)
8219 funcdef_flag = true;
8221 /* Look inside a declarator for the name being declared
8222 and get it as a string, for an error message. */
8223 for (id_declarator = declarator;
8225 id_declarator = id_declarator->declarator)
8227 if (id_declarator->kind != cdk_id)
8228 innermost_code = id_declarator->kind;
8230 switch (id_declarator->kind)
8233 if (id_declarator->declarator
8234 && id_declarator->declarator->kind == cdk_id)
8236 sfk = id_declarator->declarator->u.id.sfk;
8237 if (sfk == sfk_destructor)
8244 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8245 tree decl = id_declarator->u.id.unqualified_name;
8248 if (qualifying_scope)
8250 if (at_function_scope_p ())
8254 A declarator-id shall not be qualified except
8257 None of the cases are permitted in block
8259 if (qualifying_scope == global_namespace)
8260 error ("invalid use of qualified-name %<::%D%>",
8262 else if (TYPE_P (qualifying_scope))
8263 error ("invalid use of qualified-name %<%T::%D%>",
8264 qualifying_scope, decl);
8266 error ("invalid use of qualified-name %<%D::%D%>",
8267 qualifying_scope, decl);
8268 return error_mark_node;
8270 else if (TYPE_P (qualifying_scope))
8272 ctype = qualifying_scope;
8273 if (innermost_code != cdk_function
8274 && current_class_type
8275 && !UNIQUELY_DERIVED_FROM_P (ctype,
8276 current_class_type))
8278 error ("type %qT is not derived from type %qT",
8279 ctype, current_class_type);
8280 return error_mark_node;
8283 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8284 in_namespace = qualifying_scope;
8286 switch (TREE_CODE (decl))
8292 if (innermost_code != cdk_function)
8294 error ("declaration of %qD as non-function", decl);
8295 return error_mark_node;
8297 else if (!qualifying_scope
8298 && !(current_class_type && at_class_scope_p ()))
8300 error ("declaration of %qD as non-member", decl);
8301 return error_mark_node;
8304 type = TREE_OPERAND (decl, 0);
8306 type = constructor_name (type);
8307 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8312 case TEMPLATE_ID_EXPR:
8314 tree fns = TREE_OPERAND (decl, 0);
8317 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8319 gcc_assert (is_overloaded_fn (dname));
8320 dname = DECL_NAME (get_first_fn (dname));
8325 case IDENTIFIER_NODE:
8326 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8329 if (C_IS_RESERVED_WORD (dname))
8331 error ("declarator-id missing; using reserved word %qD",
8333 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8335 else if (!IDENTIFIER_TYPENAME_P (dname))
8336 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8339 gcc_assert (flags == NO_SPECIAL);
8340 flags = TYPENAME_FLAG;
8341 ctor_return_type = TREE_TYPE (dname);
8342 sfk = sfk_conversion;
8343 if (is_typename_at_global_scope (dname))
8344 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8346 name = "<invalid operator>";
8363 return error_mark_node;
8368 if (id_declarator->kind == cdk_id)
8374 The declarator in a function-definition shall have the form
8375 D1 ( parameter-declaration-clause) ... */
8376 if (funcdef_flag && innermost_code != cdk_function)
8378 error ("function definition does not declare parameters");
8379 return error_mark_node;
8382 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8383 && innermost_code != cdk_function
8384 && ! (ctype && !declspecs->any_specifiers_p))
8386 error ("declaration of %qD as non-function", dname);
8387 return error_mark_node;
8390 /* Anything declared one level down from the top level
8391 must be one of the parameters of a function
8392 (because the body is at least two levels down). */
8394 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8395 by not allowing C++ class definitions to specify their parameters
8396 with xdecls (must be spec.d in the parmlist).
8398 Since we now wait to push a class scope until we are sure that
8399 we are in a legitimate method context, we must set oldcname
8400 explicitly (since current_class_name is not yet alive).
8402 We also want to avoid calling this a PARM if it is in a namespace. */
8404 if (decl_context == NORMAL && !toplevel_bindings_p ())
8406 struct cp_binding_level *b = current_binding_level;
8407 current_binding_level = b->level_chain;
8408 if (current_binding_level != 0 && toplevel_bindings_p ())
8409 decl_context = PARM;
8410 current_binding_level = b;
8414 name = decl_context == PARM ? "parameter" : "type name";
8416 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8418 error ("%<constexpr%> cannot appear in a typedef declaration");
8419 return error_mark_node;
8422 /* If there were multiple types specified in the decl-specifier-seq,
8423 issue an error message. */
8424 if (declspecs->multiple_types_p)
8426 error ("two or more data types in declaration of %qs", name);
8427 return error_mark_node;
8430 if (declspecs->conflicting_specifiers_p)
8432 error ("conflicting specifiers in declaration of %qs", name);
8433 return error_mark_node;
8436 /* Extract the basic type from the decl-specifier-seq. */
8437 type = declspecs->type;
8438 if (type == error_mark_node)
8441 type_was_error_mark_node = true;
8443 /* If the entire declaration is itself tagged as deprecated then
8444 suppress reports of deprecated items. */
8445 if (type && TREE_DEPRECATED (type)
8446 && deprecated_state != DEPRECATED_SUPPRESS)
8447 warn_deprecated_use (type, NULL_TREE);
8448 if (type && TREE_CODE (type) == TYPE_DECL)
8450 typedef_decl = type;
8451 type = TREE_TYPE (typedef_decl);
8452 if (TREE_DEPRECATED (type)
8453 && DECL_ARTIFICIAL (typedef_decl)
8454 && deprecated_state != DEPRECATED_SUPPRESS)
8455 warn_deprecated_use (type, NULL_TREE);
8457 /* No type at all: default to `int', and set DEFAULTED_INT
8458 because it was not a user-defined typedef. */
8459 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8461 /* These imply 'int'. */
8462 type = integer_type_node;
8466 explicit_int = declspecs->explicit_int_p;
8467 explicit_char = declspecs->explicit_char_p;
8470 /* See the code below that used this. */
8472 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8474 typedef_type = type;
8477 if (sfk != sfk_conversion)
8478 ctor_return_type = ctype;
8480 if (sfk != sfk_none)
8481 type = check_special_function_return_type (sfk, type,
8483 else if (type == NULL_TREE)
8489 /* We handle `main' specially here, because 'main () { }' is so
8490 common. With no options, it is allowed. With -Wreturn-type,
8491 it is a warning. It is only an error with -pedantic-errors. */
8492 is_main = (funcdef_flag
8493 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8494 && MAIN_NAME_P (dname)
8495 && ctype == NULL_TREE
8496 && in_namespace == NULL_TREE
8497 && current_namespace == global_namespace);
8499 if (type_was_error_mark_node)
8500 /* We've already issued an error, don't complain more. */;
8501 else if (in_system_header || flag_ms_extensions)
8502 /* Allow it, sigh. */;
8504 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8506 pedwarn (input_location, OPT_pedantic,
8507 "ISO C++ forbids declaration of %qs with no type", name);
8509 warning (OPT_Wreturn_type,
8510 "ISO C++ forbids declaration of %qs with no type", name);
8512 type = integer_type_node;
8517 /* Now process the modifiers that were specified
8518 and check for invalid combinations. */
8520 /* Long double is a special combination. */
8521 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8524 type = cp_build_qualified_type (long_double_type_node,
8525 cp_type_quals (type));
8528 /* Check all other uses of type modifiers. */
8530 if (unsigned_p || signed_p || long_p || short_p)
8534 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8535 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8536 else if (signed_p && unsigned_p)
8537 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8538 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8539 error ("%<long long%> invalid for %qs", name);
8540 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8541 error ("%<__int128%> invalid for %qs", name);
8542 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8543 error ("%<long%> invalid for %qs", name);
8544 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8545 error ("%<short%> invalid for %qs", name);
8546 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8547 error ("%<long%> or %<short%> invalid for %qs", name);
8548 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8549 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8550 else if ((long_p || short_p) && explicit_char)
8551 error ("%<long%> or %<short%> specified with char for %qs", name);
8552 else if (long_p && short_p)
8553 error ("%<long%> and %<short%> specified together for %qs", name);
8554 else if (type == char16_type_node || type == char32_type_node)
8556 if (signed_p || unsigned_p)
8557 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8558 else if (short_p || long_p)
8559 error ("%<short%> or %<long%> invalid for %qs", name);
8564 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8566 pedwarn (input_location, OPT_pedantic,
8567 "long, short, signed or unsigned used invalidly for %qs",
8569 if (flag_pedantic_errors)
8572 if (explicit_int128)
8574 if (int128_integer_type_node == NULL_TREE)
8576 error ("%<__int128%> is not supported by this target");
8581 pedwarn (input_location, OPT_pedantic,
8582 "ISO C++ does not support %<__int128%> for %qs",
8584 if (flag_pedantic_errors)
8590 /* Discard the type modifiers if they are invalid. */
8598 explicit_int128 = false;
8602 /* Decide whether an integer type is signed or not.
8603 Optionally treat bitfields as signed by default. */
8607 It is implementation-defined whether a plain (neither
8608 explicitly signed or unsigned) char, short, int, or long
8609 bit-field is signed or unsigned.
8611 Naturally, we extend this to long long as well. Note that
8612 this does not include wchar_t. */
8613 || (bitfield && !flag_signed_bitfields
8615 /* A typedef for plain `int' without `signed' can be
8616 controlled just like plain `int', but a typedef for
8617 `signed int' cannot be so controlled. */
8619 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8620 && TREE_CODE (type) == INTEGER_TYPE
8621 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8623 if (explicit_int128)
8624 type = int128_unsigned_type_node;
8626 type = long_long_unsigned_type_node;
8628 type = long_unsigned_type_node;
8630 type = short_unsigned_type_node;
8631 else if (type == char_type_node)
8632 type = unsigned_char_type_node;
8633 else if (typedef_decl)
8634 type = unsigned_type_for (type);
8636 type = unsigned_type_node;
8638 else if (signed_p && type == char_type_node)
8639 type = signed_char_type_node;
8640 else if (explicit_int128)
8641 type = int128_integer_type_node;
8643 type = long_long_integer_type_node;
8645 type = long_integer_type_node;
8647 type = short_integer_type_node;
8649 if (declspecs->specs[(int)ds_complex])
8651 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8652 error ("complex invalid for %qs", name);
8653 /* If we just have "complex", it is equivalent to
8654 "complex double", but if any modifiers at all are specified it is
8655 the complex form of TYPE. E.g, "complex short" is
8656 "complex short int". */
8657 else if (defaulted_int && ! longlong && ! explicit_int128
8658 && ! (long_p || short_p || signed_p || unsigned_p))
8659 type = complex_double_type_node;
8660 else if (type == integer_type_node)
8661 type = complex_integer_type_node;
8662 else if (type == float_type_node)
8663 type = complex_float_type_node;
8664 else if (type == double_type_node)
8665 type = complex_double_type_node;
8666 else if (type == long_double_type_node)
8667 type = complex_long_double_type_node;
8669 type = build_complex_type (type);
8672 type_quals = TYPE_UNQUALIFIED;
8673 if (declspecs->specs[(int)ds_const])
8674 type_quals |= TYPE_QUAL_CONST;
8675 if (declspecs->specs[(int)ds_volatile])
8676 type_quals |= TYPE_QUAL_VOLATILE;
8677 if (declspecs->specs[(int)ds_restrict])
8678 type_quals |= TYPE_QUAL_RESTRICT;
8679 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8680 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8683 type_quals |= cp_type_quals (type);
8684 type = cp_build_qualified_type_real
8685 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8686 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8687 /* We might have ignored or rejected some of the qualifiers. */
8688 type_quals = cp_type_quals (type);
8691 inlinep = !! declspecs->specs[(int)ds_inline];
8692 virtualp = !! declspecs->specs[(int)ds_virtual];
8693 explicitp = !! declspecs->specs[(int)ds_explicit];
8695 storage_class = declspecs->storage_class;
8696 if (storage_class == sc_static)
8697 staticp = 1 + (decl_context == FIELD);
8699 if (virtualp && staticp == 2)
8701 error ("member %qD cannot be declared both virtual and static", dname);
8702 storage_class = sc_none;
8705 friendp = !! declspecs->specs[(int)ds_friend];
8707 if (dependent_name && !friendp)
8709 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8710 return error_mark_node;
8713 /* Issue errors about use of storage classes for parameters. */
8714 if (decl_context == PARM)
8716 if (declspecs->specs[(int)ds_typedef])
8718 error ("typedef declaration invalid in parameter declaration");
8719 return error_mark_node;
8721 else if (template_parm_flag && storage_class != sc_none)
8723 error ("storage class specified for template parameter %qs", name);
8724 return error_mark_node;
8726 else if (storage_class == sc_static
8727 || storage_class == sc_extern
8729 error ("storage class specifiers invalid in parameter declarations");
8731 if (type_uses_auto (type))
8733 error ("parameter declared %<auto%>");
8734 type = error_mark_node;
8737 /* Function parameters cannot be constexpr. If we saw one, moan
8738 and pretend it wasn't there. */
8741 error ("a parameter cannot be declared %<constexpr%>");
8746 /* Give error if `virtual' is used outside of class declaration. */
8748 && (current_class_name == NULL_TREE || decl_context != FIELD))
8750 error ("%<virtual%> outside class declaration");
8754 /* Static anonymous unions are dealt with here. */
8755 if (staticp && decl_context == TYPENAME
8757 && ANON_AGGR_TYPE_P (declspecs->type))
8758 decl_context = FIELD;
8760 /* Warn about storage classes that are invalid for certain
8761 kinds of declarations (parameters, typenames, etc.). */
8764 && storage_class != sc_extern
8765 && storage_class != sc_static)
8766 || declspecs->specs[(int)ds_typedef]))
8768 error ("multiple storage classes in declaration of %qs", name);
8771 if (decl_context != NORMAL
8772 && ((storage_class != sc_none
8773 && storage_class != sc_mutable)
8776 if ((decl_context == PARM || decl_context == CATCHPARM)
8777 && (storage_class == sc_register
8778 || storage_class == sc_auto))
8780 else if (declspecs->specs[(int)ds_typedef])
8782 else if (decl_context == FIELD
8783 /* C++ allows static class elements. */
8784 && storage_class == sc_static)
8785 /* C++ also allows inlines and signed and unsigned elements,
8786 but in those cases we don't come in here. */
8790 if (decl_context == FIELD)
8791 error ("storage class specified for %qs", name);
8794 if (decl_context == PARM || decl_context == CATCHPARM)
8795 error ("storage class specified for parameter %qs", name);
8797 error ("storage class specified for typename");
8799 if (storage_class == sc_register
8800 || storage_class == sc_auto
8801 || storage_class == sc_extern
8803 storage_class = sc_none;
8806 else if (storage_class == sc_extern && funcdef_flag
8807 && ! toplevel_bindings_p ())
8808 error ("nested function %qs declared %<extern%>", name);
8809 else if (toplevel_bindings_p ())
8811 if (storage_class == sc_auto)
8812 error ("top-level declaration of %qs specifies %<auto%>", name);
8815 && storage_class != sc_extern
8816 && storage_class != sc_static)
8818 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8823 if (storage_class && friendp)
8825 error ("storage class specifiers invalid in friend function declarations");
8826 storage_class = sc_none;
8831 unqualified_id = NULL_TREE;
8834 unqualified_id = id_declarator->u.id.unqualified_name;
8835 switch (TREE_CODE (unqualified_id))
8838 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8839 if (TYPE_P (unqualified_id))
8840 unqualified_id = constructor_name (unqualified_id);
8843 case IDENTIFIER_NODE:
8844 case TEMPLATE_ID_EXPR:
8852 /* Determine the type of the entity declared by recurring on the
8854 for (; declarator; declarator = declarator->declarator)
8856 const cp_declarator *inner_declarator;
8859 if (type == error_mark_node)
8860 return error_mark_node;
8862 attrs = declarator->attributes;
8868 if (declarator == NULL || declarator->kind == cdk_id)
8869 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8870 if (declarator->kind == cdk_function)
8871 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8872 if (declarator->kind == cdk_array)
8873 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8874 returned_attrs = decl_attributes (&type,
8875 chainon (returned_attrs, attrs),
8879 if (declarator->kind == cdk_id)
8882 inner_declarator = declarator->declarator;
8884 switch (declarator->kind)
8887 type = create_array_type_for_decl (dname, type,
8888 declarator->u.array.bounds);
8896 /* Declaring a function type.
8897 Make sure we have a valid type for the function to return. */
8899 if (type_quals != TYPE_UNQUALIFIED)
8901 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8902 warning (OPT_Wignored_qualifiers,
8903 "type qualifiers ignored on function return type");
8904 /* We now know that the TYPE_QUALS don't apply to the
8905 decl, but to its return type. */
8906 type_quals = TYPE_UNQUALIFIED;
8908 errmsg = targetm.invalid_return_type (type);
8912 type = integer_type_node;
8915 /* Error about some types functions can't return. */
8917 if (TREE_CODE (type) == FUNCTION_TYPE)
8919 error ("%qs declared as function returning a function", name);
8920 return error_mark_node;
8922 if (TREE_CODE (type) == ARRAY_TYPE)
8924 error ("%qs declared as function returning an array", name);
8925 return error_mark_node;
8928 /* Pick up type qualifiers which should be applied to `this'. */
8929 memfn_quals = declarator->u.function.qualifiers;
8930 /* Pick up virt-specifiers. */
8931 virt_specifiers = declarator->u.function.virt_specifiers;
8932 /* Pick up the exception specifications. */
8933 raises = declarator->u.function.exception_specification;
8935 /* Say it's a definition only for the CALL_EXPR
8936 closest to the identifier. */
8937 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8939 /* Handle a late-specified return type. */
8942 if (type_uses_auto (type))
8944 if (!declarator->u.function.late_return_type)
8946 error ("%qs function uses %<auto%> type specifier without"
8947 " late return type", name);
8948 return error_mark_node;
8950 else if (!is_auto (type))
8952 error ("%qs function with late return type has"
8953 " %qT as its type rather than plain %<auto%>",
8955 return error_mark_node;
8958 else if (declarator->u.function.late_return_type)
8960 error ("%qs function with late return type not declared"
8961 " with %<auto%> type specifier", name);
8962 return error_mark_node;
8965 type = splice_late_return_type
8966 (type, declarator->u.function.late_return_type);
8967 if (type == error_mark_node)
8968 return error_mark_node;
8970 if (ctype == NULL_TREE
8971 && decl_context == FIELD
8973 && (friendp == 0 || dname == current_class_name))
8974 ctype = current_class_type;
8976 if (ctype && (sfk == sfk_constructor
8977 || sfk == sfk_destructor))
8979 /* We are within a class's scope. If our declarator name
8980 is the same as the class name, and we are defining
8981 a function, then it is a constructor/destructor, and
8982 therefore returns a void type. */
8984 /* ISO C++ 12.4/2. A destructor may not be declared
8985 const or volatile. A destructor may not be
8988 ISO C++ 12.1. A constructor may not be declared
8989 const or volatile. A constructor may not be
8990 virtual. A constructor may not be static. */
8992 error ((flags == DTOR_FLAG)
8993 ? "destructor cannot be static member function"
8994 : "constructor cannot be static member function");
8997 error ((flags == DTOR_FLAG)
8998 ? "destructors may not be cv-qualified"
8999 : "constructors may not be cv-qualified");
9000 memfn_quals = TYPE_UNQUALIFIED;
9003 if (decl_context == FIELD
9004 && !member_function_or_else (ctype,
9007 return error_mark_node;
9009 if (flags != DTOR_FLAG)
9011 /* It's a constructor. */
9016 permerror (input_location, "constructors cannot be declared virtual");
9019 if (decl_context == FIELD
9020 && sfk != sfk_constructor)
9021 return error_mark_node;
9023 if (decl_context == FIELD)
9029 error ("can%'t initialize friend function %qs", name);
9032 /* Cannot be both friend and virtual. */
9033 error ("virtual functions cannot be friends");
9036 if (decl_context == NORMAL)
9037 error ("friend declaration not in class definition");
9038 if (current_function_decl && funcdef_flag)
9039 error ("can%'t define friend function %qs in a local "
9043 else if (ctype && sfk == sfk_conversion)
9047 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9052 arg_types = grokparms (declarator->u.function.parameters,
9055 if (inner_declarator
9056 && inner_declarator->kind == cdk_id
9057 && inner_declarator->u.id.sfk == sfk_destructor
9058 && arg_types != void_list_node)
9060 error ("destructors may not have parameters");
9061 arg_types = void_list_node;
9065 type = build_function_type (type, arg_types);
9072 /* Filter out pointers-to-references and references-to-references.
9073 We can get these if a TYPE_DECL is used. */
9075 if (TREE_CODE (type) == REFERENCE_TYPE)
9077 if (declarator->kind != cdk_reference)
9079 error ("cannot declare pointer to %q#T", type);
9080 type = TREE_TYPE (type);
9083 /* In C++0x, we allow reference to reference declarations
9084 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9085 and template type arguments [14.3.1/4 temp.arg.type]. The
9086 check for direct reference to reference declarations, which
9087 are still forbidden, occurs below. Reasoning behind the change
9088 can be found in DR106, DR540, and the rvalue reference
9090 else if (cxx_dialect == cxx98)
9092 error ("cannot declare reference to %q#T", type);
9093 type = TREE_TYPE (type);
9096 else if (VOID_TYPE_P (type))
9098 if (declarator->kind == cdk_reference)
9099 error ("cannot declare reference to %q#T", type);
9100 else if (declarator->kind == cdk_ptrmem)
9101 error ("cannot declare pointer to %q#T member", type);
9104 /* We now know that the TYPE_QUALS don't apply to the decl,
9105 but to the target of the pointer. */
9106 type_quals = TYPE_UNQUALIFIED;
9108 if (declarator->kind == cdk_ptrmem
9109 && (TREE_CODE (type) == FUNCTION_TYPE
9110 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9112 memfn_quals |= type_memfn_quals (type);
9113 type = build_memfn_type (type,
9114 declarator->u.pointer.class_type,
9116 if (type == error_mark_node)
9117 return error_mark_node;
9118 memfn_quals = TYPE_UNQUALIFIED;
9121 if (TREE_CODE (type) == FUNCTION_TYPE
9122 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9123 error (declarator->kind == cdk_reference
9124 ? G_("cannot declare reference to qualified function type %qT")
9125 : G_("cannot declare pointer to qualified function type %qT"),
9128 /* When the pointed-to type involves components of variable size,
9129 care must be taken to ensure that the size evaluation code is
9130 emitted early enough to dominate all the possible later uses
9131 and late enough for the variables on which it depends to have
9134 This is expected to happen automatically when the pointed-to
9135 type has a name/declaration of it's own, but special attention
9136 is required if the type is anonymous.
9138 We handle the NORMAL and FIELD contexts here by inserting a
9139 dummy statement that just evaluates the size at a safe point
9140 and ensures it is not deferred until e.g. within a deeper
9141 conditional context (c++/43555).
9143 We expect nothing to be needed here for PARM or TYPENAME.
9144 Evaluating the size at this point for TYPENAME would
9145 actually be incorrect, as we might be in the middle of an
9146 expression with side effects on the pointed-to type size
9147 "arguments" prior to the pointer declaration point and the
9148 size evaluation could end up prior to the side effects. */
9150 if (!TYPE_NAME (type)
9151 && (decl_context == NORMAL || decl_context == FIELD)
9152 && at_function_scope_p ()
9153 && variably_modified_type_p (type, NULL_TREE))
9155 /* First break out any side-effects. */
9156 stabilize_vla_size (TYPE_SIZE (type));
9157 /* And then force evaluation of the SAVE_EXPR. */
9158 finish_expr_stmt (TYPE_SIZE (type));
9161 if (declarator->kind == cdk_reference)
9163 /* In C++0x, the type we are creating a reference to might be
9164 a typedef which is itself a reference type. In that case,
9165 we follow the reference collapsing rules in
9166 [7.1.3/8 dcl.typedef] to create the final reference type:
9168 "If a typedef TD names a type that is a reference to a type
9169 T, an attempt to create the type 'lvalue reference to cv TD'
9170 creates the type 'lvalue reference to T,' while an attempt
9171 to create the type "rvalue reference to cv TD' creates the
9174 if (!VOID_TYPE_P (type))
9175 type = cp_build_reference_type
9176 ((TREE_CODE (type) == REFERENCE_TYPE
9177 ? TREE_TYPE (type) : type),
9178 (declarator->u.reference.rvalue_ref
9179 && (TREE_CODE(type) != REFERENCE_TYPE
9180 || TYPE_REF_IS_RVALUE (type))));
9182 /* In C++0x, we need this check for direct reference to
9183 reference declarations, which are forbidden by
9184 [8.3.2/5 dcl.ref]. Reference to reference declarations
9185 are only allowed indirectly through typedefs and template
9186 type arguments. Example:
9188 void foo(int & &); // invalid ref-to-ref decl
9190 typedef int & int_ref;
9191 void foo(int_ref &); // valid ref-to-ref decl
9193 if (inner_declarator && inner_declarator->kind == cdk_reference)
9194 error ("cannot declare reference to %q#T, which is not "
9195 "a typedef or a template type argument", type);
9197 else if (TREE_CODE (type) == METHOD_TYPE)
9198 type = build_ptrmemfunc_type (build_pointer_type (type));
9199 else if (declarator->kind == cdk_ptrmem)
9201 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9203 if (declarator->u.pointer.class_type == error_mark_node)
9204 /* We will already have complained. */
9205 type = error_mark_node;
9207 type = build_ptrmem_type (declarator->u.pointer.class_type,
9211 type = build_pointer_type (type);
9213 /* Process a list of type modifier keywords (such as
9214 const or volatile) that were given inside the `*' or `&'. */
9216 if (declarator->u.pointer.qualifiers)
9219 = cp_build_qualified_type (type,
9220 declarator->u.pointer.qualifiers);
9221 type_quals = cp_type_quals (type);
9234 /* We need to stabilize side-effects in VLA sizes for regular array
9235 declarations too, not just pointers to arrays. */
9236 if (type != error_mark_node && !TYPE_NAME (type)
9237 && (decl_context == NORMAL || decl_context == FIELD)
9238 && at_function_scope_p ()
9239 && variably_modified_type_p (type, NULL_TREE))
9240 stabilize_vla_size (TYPE_SIZE (type));
9242 /* A `constexpr' specifier used in an object declaration declares
9243 the object as `const'. */
9244 if (constexpr_p && innermost_code != cdk_function)
9246 if (type_quals & TYPE_QUAL_CONST)
9247 error ("both %<const%> and %<constexpr%> cannot be used here");
9248 if (type_quals & TYPE_QUAL_VOLATILE)
9249 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9250 type_quals |= TYPE_QUAL_CONST;
9251 type = cp_build_qualified_type (type, type_quals);
9254 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9255 && TREE_CODE (type) != FUNCTION_TYPE
9256 && TREE_CODE (type) != METHOD_TYPE)
9258 error ("template-id %qD used as a declarator",
9260 unqualified_id = dname;
9263 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9264 qualified with a class-name, turn it into a METHOD_TYPE, unless
9265 we know that the function is static. We take advantage of this
9266 opportunity to do other processing that pertains to entities
9267 explicitly declared to be class members. Note that if DECLARATOR
9268 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9269 would not have exited the loop above. */
9271 && declarator->u.id.qualifying_scope
9272 && TYPE_P (declarator->u.id.qualifying_scope))
9276 ctype = declarator->u.id.qualifying_scope;
9277 ctype = TYPE_MAIN_VARIANT (ctype);
9279 while (t != NULL_TREE && CLASS_TYPE_P (t))
9281 /* You're supposed to have one `template <...>' for every
9282 template class, but you don't need one for a full
9283 specialization. For example:
9285 template <class T> struct S{};
9286 template <> struct S<int> { void f(); };
9287 void S<int>::f () {}
9289 is correct; there shouldn't be a `template <>' for the
9290 definition of `S<int>::f'. */
9291 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9292 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9293 /* T is an explicit (not partial) specialization. All
9294 containing classes must therefore also be explicitly
9297 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9298 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9299 template_count += 1;
9301 t = TYPE_MAIN_DECL (t);
9302 t = DECL_CONTEXT (t);
9305 if (ctype == current_class_type)
9309 permerror (input_location, "member functions are implicitly friends of their class");
9313 permerror (declarator->id_loc,
9314 "extra qualification %<%T::%> on member %qs",
9317 else if (/* If the qualifying type is already complete, then we
9318 can skip the following checks. */
9319 !COMPLETE_TYPE_P (ctype)
9320 && (/* If the function is being defined, then
9321 qualifying type must certainly be complete. */
9323 /* A friend declaration of "T::f" is OK, even if
9324 "T" is a template parameter. But, if this
9325 function is not a friend, the qualifying type
9327 || (!friendp && !CLASS_TYPE_P (ctype))
9328 /* For a declaration, the type need not be
9329 complete, if either it is dependent (since there
9330 is no meaningful definition of complete in that
9331 case) or the qualifying class is currently being
9333 || !(dependent_type_p (ctype)
9334 || currently_open_class (ctype)))
9335 /* Check that the qualifying type is complete. */
9336 && !complete_type_or_else (ctype, NULL_TREE))
9337 return error_mark_node;
9338 else if (TREE_CODE (type) == FUNCTION_TYPE)
9340 if (current_class_type
9341 && (!friendp || funcdef_flag))
9344 ? "cannot define member function %<%T::%s%> within %<%T%>"
9345 : "cannot declare member function %<%T::%s%> within %<%T%>",
9346 ctype, name, current_class_type);
9347 return error_mark_node;
9350 else if (declspecs->specs[(int)ds_typedef]
9351 && current_class_type)
9353 error ("cannot declare member %<%T::%s%> within %qT",
9354 ctype, name, current_class_type);
9355 return error_mark_node;
9359 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9360 ctype = current_class_type;
9362 /* A constexpr non-static member function is implicitly const. */
9363 if (constexpr_p && ctype && staticp == 0
9364 && TREE_CODE (type) == FUNCTION_TYPE
9365 && sfk != sfk_constructor && sfk != sfk_destructor)
9366 memfn_quals |= TYPE_QUAL_CONST;
9368 /* Now TYPE has the actual type. */
9373 *attrlist = chainon (returned_attrs, *attrlist);
9375 attrlist = &returned_attrs;
9378 /* Handle parameter packs. */
9379 if (parameter_pack_p)
9381 if (decl_context == PARM)
9382 /* Turn the type into a pack expansion.*/
9383 type = make_pack_expansion (type);
9385 error ("non-parameter %qs cannot be a parameter pack", name);
9388 /* Did array size calculations overflow? */
9390 if (TREE_CODE (type) == ARRAY_TYPE
9391 && COMPLETE_TYPE_P (type)
9392 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9393 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9395 error ("size of array %qs is too large", name);
9396 /* If we proceed with the array type as it is, we'll eventually
9397 crash in tree_low_cst(). */
9398 type = error_mark_node;
9401 if ((decl_context == FIELD || decl_context == PARM)
9402 && !processing_template_decl
9403 && variably_modified_type_p (type, NULL_TREE))
9405 if (decl_context == FIELD)
9406 error ("data member may not have variably modified type %qT", type);
9408 error ("parameter may not have variably modified type %qT", type);
9409 type = error_mark_node;
9412 if (explicitp == 1 || (explicitp && friendp))
9414 /* [dcl.fct.spec] The explicit specifier shall only be used in
9415 declarations of constructors within a class definition. */
9416 error ("only declarations of constructors can be %<explicit%>");
9420 if (storage_class == sc_mutable)
9422 if (decl_context != FIELD || friendp)
9424 error ("non-member %qs cannot be declared %<mutable%>", name);
9425 storage_class = sc_none;
9427 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9429 error ("non-object member %qs cannot be declared %<mutable%>", name);
9430 storage_class = sc_none;
9432 else if (TREE_CODE (type) == FUNCTION_TYPE
9433 || TREE_CODE (type) == METHOD_TYPE)
9435 error ("function %qs cannot be declared %<mutable%>", name);
9436 storage_class = sc_none;
9440 error ("static %qs cannot be declared %<mutable%>", name);
9441 storage_class = sc_none;
9443 else if (type_quals & TYPE_QUAL_CONST)
9445 error ("const %qs cannot be declared %<mutable%>", name);
9446 storage_class = sc_none;
9448 else if (TREE_CODE (type) == REFERENCE_TYPE)
9450 permerror (input_location, "reference %qs cannot be declared "
9451 "%<mutable%>", name);
9452 storage_class = sc_none;
9456 /* If this is declaring a typedef name, return a TYPE_DECL. */
9457 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9461 /* Note that the grammar rejects storage classes
9462 in typenames, fields or parameters. */
9463 if (current_lang_name == lang_name_java)
9464 TYPE_FOR_JAVA (type) = 1;
9466 /* This declaration:
9468 typedef void f(int) const;
9470 declares a function type which is not a member of any
9471 particular class, but which is cv-qualified; for
9472 example "f S::*" declares a pointer to a const-qualified
9473 member function of S. We record the cv-qualification in the
9475 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9477 type = apply_memfn_quals (type, memfn_quals);
9479 /* We have now dealt with these qualifiers. */
9480 memfn_quals = TYPE_UNQUALIFIED;
9483 if (decl_context == FIELD)
9484 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9486 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9487 if (id_declarator && declarator->u.id.qualifying_scope) {
9488 error_at (DECL_SOURCE_LOCATION (decl),
9489 "typedef name may not be a nested-name-specifier");
9490 TREE_TYPE (decl) = error_mark_node;
9493 if (decl_context != FIELD)
9495 if (!current_function_decl)
9496 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9497 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9498 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9499 (current_function_decl)))
9500 /* The TYPE_DECL is "abstract" because there will be
9501 clones of this constructor/destructor, and there will
9502 be copies of this TYPE_DECL generated in those
9504 DECL_ABSTRACT (decl) = 1;
9506 else if (constructor_name_p (unqualified_id, current_class_type))
9507 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9508 "as enclosing class",
9511 /* If the user declares "typedef struct {...} foo" then the
9512 struct will have an anonymous name. Fill that name in now.
9513 Nothing can refer to it, so nothing needs know about the name
9515 if (type != error_mark_node
9518 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9519 && TYPE_ANONYMOUS_P (type)
9520 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9524 /* Replace the anonymous name with the real name everywhere. */
9525 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9527 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9528 /* We do not rename the debug info representing the
9529 anonymous tagged type because the standard says in
9530 [dcl.typedef] that the naming applies only for
9531 linkage purposes. */
9532 /*debug_hooks->set_name (t, decl);*/
9533 TYPE_NAME (t) = decl;
9536 if (TYPE_LANG_SPECIFIC (type))
9537 TYPE_WAS_ANONYMOUS (type) = 1;
9539 /* If this is a typedef within a template class, the nested
9540 type is a (non-primary) template. The name for the
9541 template needs updating as well. */
9542 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9543 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9544 = TYPE_IDENTIFIER (type);
9546 /* Adjust linkage now that we aren't anonymous anymore. */
9547 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9548 determine_visibility (TYPE_MAIN_DECL (type));
9550 /* FIXME remangle member functions; member functions of a
9551 type with external linkage have external linkage. */
9555 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9556 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9558 bad_specifiers (decl, BSP_TYPE, virtualp,
9559 memfn_quals != TYPE_UNQUALIFIED,
9560 inlinep, friendp, raises != NULL_TREE);
9565 /* Detect the case of an array type of unspecified size
9566 which came, as such, direct from a typedef name.
9567 We must copy the type, so that the array's domain can be
9568 individually set by the object's initializer. */
9570 if (type && typedef_type
9571 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9572 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9573 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9575 /* Detect where we're using a typedef of function type to declare a
9576 function. PARMS will not be set, so we must create it now. */
9578 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9580 tree decls = NULL_TREE;
9583 for (args = TYPE_ARG_TYPES (type);
9584 args && args != void_list_node;
9585 args = TREE_CHAIN (args))
9587 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9589 DECL_CHAIN (decl) = decls;
9593 parms = nreverse (decls);
9595 if (decl_context != TYPENAME)
9597 /* A cv-qualifier-seq shall only be part of the function type
9598 for a non-static member function. [8.3.5/4 dcl.fct] */
9599 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9600 && (current_class_type == NULL_TREE || staticp) )
9603 ? G_("qualified function types cannot be used to "
9604 "declare static member functions")
9605 : G_("qualified function types cannot be used to "
9606 "declare free functions"));
9607 type = TYPE_MAIN_VARIANT (type);
9610 /* The qualifiers on the function type become the qualifiers on
9611 the non-static member function. */
9612 memfn_quals |= type_memfn_quals (type);
9613 type_quals = TYPE_UNQUALIFIED;
9617 /* If this is a type name (such as, in a cast or sizeof),
9618 compute the type and return it now. */
9620 if (decl_context == TYPENAME)
9622 /* Note that the grammar rejects storage classes
9623 in typenames, fields or parameters. */
9624 if (type_quals != TYPE_UNQUALIFIED)
9625 type_quals = TYPE_UNQUALIFIED;
9627 /* Special case: "friend class foo" looks like a TYPENAME context. */
9630 if (type_quals != TYPE_UNQUALIFIED)
9632 error ("type qualifiers specified for friend class declaration");
9633 type_quals = TYPE_UNQUALIFIED;
9637 error ("%<inline%> specified for friend class declaration");
9643 /* Don't allow friend declaration without a class-key. */
9644 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9645 permerror (input_location, "template parameters cannot be friends");
9646 else if (TREE_CODE (type) == TYPENAME_TYPE)
9647 permerror (input_location, "friend declaration requires class-key, "
9648 "i.e. %<friend class %T::%D%>",
9649 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9651 permerror (input_location, "friend declaration requires class-key, "
9652 "i.e. %<friend %#T%>",
9656 /* Only try to do this stuff if we didn't already give up. */
9657 if (type != integer_type_node)
9659 /* A friendly class? */
9660 if (current_class_type)
9661 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9664 error ("trying to make class %qT a friend of global scope",
9667 type = void_type_node;
9670 else if (memfn_quals)
9672 if (ctype == NULL_TREE
9673 && TREE_CODE (type) == METHOD_TYPE)
9674 ctype = TYPE_METHOD_BASETYPE (type);
9677 type = build_memfn_type (type, ctype, memfn_quals);
9678 /* Core issue #547: need to allow this in template type args. */
9679 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9680 type = apply_memfn_quals (type, memfn_quals);
9682 error ("invalid qualifiers on non-member function type");
9687 else if (unqualified_id == NULL_TREE && decl_context != PARM
9688 && decl_context != CATCHPARM
9689 && TREE_CODE (type) != UNION_TYPE
9692 error ("abstract declarator %qT used as declaration", type);
9693 return error_mark_node;
9696 /* Only functions may be declared using an operator-function-id. */
9698 && IDENTIFIER_OPNAME_P (unqualified_id)
9699 && TREE_CODE (type) != FUNCTION_TYPE
9700 && TREE_CODE (type) != METHOD_TYPE)
9702 error ("declaration of %qD as non-function", unqualified_id);
9703 return error_mark_node;
9706 /* We don't check parameter types here because we can emit a better
9707 error message later. */
9708 if (decl_context != PARM)
9710 type = check_var_type (unqualified_id, type);
9711 if (type == error_mark_node)
9712 return error_mark_node;
9715 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9716 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9718 if (decl_context == PARM || decl_context == CATCHPARM)
9720 if (ctype || in_namespace)
9721 error ("cannot use %<::%> in parameter declaration");
9723 /* A parameter declared as an array of T is really a pointer to T.
9724 One declared as a function is really a pointer to a function.
9725 One declared as a member is really a pointer to member. */
9727 if (TREE_CODE (type) == ARRAY_TYPE)
9729 /* Transfer const-ness of array into that of type pointed to. */
9730 type = build_pointer_type (TREE_TYPE (type));
9731 type_quals = TYPE_UNQUALIFIED;
9733 else if (TREE_CODE (type) == FUNCTION_TYPE)
9734 type = build_pointer_type (type);
9737 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9738 && !NEW_DELETE_OPNAME_P (unqualified_id))
9739 type = build_memfn_type (type, ctype, memfn_quals);
9744 if (decl_context == PARM)
9746 decl = cp_build_parm_decl (unqualified_id, type);
9748 bad_specifiers (decl, BSP_PARM, virtualp,
9749 memfn_quals != TYPE_UNQUALIFIED,
9750 inlinep, friendp, raises != NULL_TREE);
9752 else if (decl_context == FIELD)
9754 /* The C99 flexible array extension. */
9755 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9756 && TYPE_DOMAIN (type) == NULL_TREE)
9758 tree itype = compute_array_index_type (dname, integer_zero_node,
9759 tf_warning_or_error);
9760 type = build_cplus_array_type (TREE_TYPE (type), itype);
9763 if (type == error_mark_node)
9765 /* Happens when declaring arrays of sizes which
9766 are error_mark_node, for example. */
9769 else if (in_namespace && !friendp)
9771 /* Something like struct S { int N::j; }; */
9772 error ("invalid use of %<::%>");
9773 return error_mark_node;
9775 else if (TREE_CODE (type) == FUNCTION_TYPE
9776 || TREE_CODE (type) == METHOD_TYPE)
9779 tree function_context;
9783 /* This should never happen in pure C++ (the check
9784 could be an assert). It could happen in
9785 Objective-C++ if someone writes invalid code that
9786 uses a function declaration for an instance
9787 variable or property (instance variables and
9788 properties are parsed as FIELD_DECLs, but they are
9789 part of an Objective-C class, not a C++ class).
9790 That code is invalid and is caught by this
9794 error ("declaration of function %qD in invalid context",
9796 return error_mark_node;
9799 /* ``A union may [ ... ] not [ have ] virtual functions.''
9801 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9803 error ("function %qD declared virtual inside a union",
9805 return error_mark_node;
9808 if (NEW_DELETE_OPNAME_P (unqualified_id))
9812 error ("%qD cannot be declared virtual, since it "
9820 /* Check that the name used for a destructor makes sense. */
9821 if (sfk == sfk_destructor)
9823 tree uqname = id_declarator->u.id.unqualified_name;
9827 gcc_assert (friendp);
9828 error ("expected qualified name in friend declaration "
9829 "for destructor %qD", uqname);
9830 return error_mark_node;
9833 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9835 error ("declaration of %qD as member of %qT",
9837 return error_mark_node;
9841 error ("a destructor cannot be %<constexpr%>");
9842 return error_mark_node;
9845 else if (sfk == sfk_constructor && friendp && !ctype)
9847 error ("expected qualified name in friend declaration "
9848 "for constructor %qD",
9849 id_declarator->u.id.unqualified_name);
9850 return error_mark_node;
9853 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9854 function_context = (ctype != NULL_TREE) ?
9855 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9856 publicp = (! friendp || ! staticp)
9857 && function_context == NULL_TREE;
9858 decl = grokfndecl (ctype, type,
9859 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9860 ? unqualified_id : dname,
9863 virtualp, flags, memfn_quals, raises,
9864 friendp ? -1 : 0, friendp, publicp,
9865 inlinep | (2 * constexpr_p),
9867 funcdef_flag, template_count, in_namespace,
9868 attrlist, declarator->id_loc);
9869 decl = set_virt_specifiers (decl, virt_specifiers);
9870 if (decl == NULL_TREE)
9871 return error_mark_node;
9873 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9874 /* The decl and setting of decl_attr is also turned off. */
9875 decl = build_decl_attribute_variant (decl, decl_attr);
9878 /* [class.conv.ctor]
9880 A constructor declared without the function-specifier
9881 explicit that can be called with a single parameter
9882 specifies a conversion from the type of its first
9883 parameter to the type of its class. Such a constructor
9884 is called a converting constructor. */
9886 DECL_NONCONVERTING_P (decl) = 1;
9888 else if (!staticp && !dependent_type_p (type)
9889 && !COMPLETE_TYPE_P (complete_type (type))
9890 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9893 error ("field %qD has incomplete type", unqualified_id);
9895 error ("name %qT has incomplete type", type);
9897 /* If we're instantiating a template, tell them which
9898 instantiation made the field's type be incomplete. */
9899 if (current_class_type
9900 && TYPE_NAME (current_class_type)
9901 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9903 && declspecs->type == type)
9904 error (" in instantiation of template %qT",
9905 current_class_type);
9907 return error_mark_node;
9913 error ("%qE is neither function nor member function; "
9914 "cannot be declared friend", unqualified_id);
9922 /* Friends are treated specially. */
9923 if (ctype == current_class_type)
9924 ; /* We already issued a permerror. */
9925 else if (decl && DECL_NAME (decl))
9927 if (template_class_depth (current_class_type) == 0)
9929 decl = check_explicit_specialization
9930 (unqualified_id, decl, template_count,
9931 2 * funcdef_flag + 4);
9932 if (decl == error_mark_node)
9933 return error_mark_node;
9936 decl = do_friend (ctype, unqualified_id, decl,
9942 return error_mark_node;
9945 /* Structure field. It may not be a function, except for C++. */
9947 if (decl == NULL_TREE)
9953 /* An attempt is being made to initialize a non-static
9954 member. But, from [class.mem]:
9956 4 A member-declarator can contain a
9957 constant-initializer only if it declares a static
9958 member (_class.static_) of integral or enumeration
9959 type, see _class.static.data_.
9961 This used to be relatively common practice, but
9962 the rest of the compiler does not correctly
9963 handle the initialization unless the member is
9964 static so we make it static below. */
9965 if (cxx_dialect >= cxx0x)
9967 sorry ("non-static data member initializers");
9971 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9973 permerror (input_location, "making %qD static", unqualified_id);
9978 if (uses_template_parms (type))
9979 /* We'll check at instantiation time. */
9981 else if (constexpr_p)
9982 /* constexpr has the same requirements. */
9984 else if (check_static_variable_definition (unqualified_id,
9986 /* If we just return the declaration, crashes
9987 will sometimes occur. We therefore return
9988 void_type_node, as if this was a friend
9989 declaration, to cause callers to completely
9990 ignore this declaration. */
9991 return error_mark_node;
9996 /* C++ allows static class members. All other work
9997 for this is done by grokfield. */
9998 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9999 set_linkage_for_static_data_member (decl);
10000 /* Even if there is an in-class initialization, DECL
10001 is considered undefined until an out-of-class
10002 definition is provided. */
10003 DECL_EXTERNAL (decl) = 1;
10006 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10008 if (constexpr_p && !initialized)
10010 error ("constexpr static data member %qD must have an "
10011 "initializer", decl);
10012 constexpr_p = false;
10019 error ("non-static data member %qE declared %<constexpr%>",
10021 constexpr_p = false;
10023 decl = build_decl (input_location,
10024 FIELD_DECL, unqualified_id, type);
10025 DECL_NONADDRESSABLE_P (decl) = bitfield;
10026 if (bitfield && !unqualified_id)
10027 TREE_NO_WARNING (decl) = 1;
10029 if (storage_class == sc_mutable)
10031 DECL_MUTABLE_P (decl) = 1;
10032 storage_class = sc_none;
10036 bad_specifiers (decl, BSP_FIELD, virtualp,
10037 memfn_quals != TYPE_UNQUALIFIED,
10038 inlinep, friendp, raises != NULL_TREE);
10041 else if (TREE_CODE (type) == FUNCTION_TYPE
10042 || TREE_CODE (type) == METHOD_TYPE)
10044 tree original_name;
10047 if (!unqualified_id)
10048 return error_mark_node;
10050 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10051 original_name = dname;
10053 original_name = unqualified_id;
10055 if (storage_class == sc_auto)
10056 error ("storage class %<auto%> invalid for function %qs", name);
10057 else if (storage_class == sc_register)
10058 error ("storage class %<register%> invalid for function %qs", name);
10060 error ("storage class %<__thread%> invalid for function %qs", name);
10062 if (virt_specifiers)
10063 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10064 /* Function declaration not at top level.
10065 Storage classes other than `extern' are not allowed
10066 and `extern' makes no difference. */
10067 if (! toplevel_bindings_p ()
10068 && (storage_class == sc_static
10069 || declspecs->specs[(int)ds_inline])
10072 if (storage_class == sc_static)
10073 pedwarn (input_location, OPT_pedantic,
10074 "%<static%> specified invalid for function %qs "
10075 "declared out of global scope", name);
10077 pedwarn (input_location, OPT_pedantic,
10078 "%<inline%> specifier invalid for function %qs "
10079 "declared out of global scope", name);
10082 if (ctype != NULL_TREE
10083 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
10085 error ("%q#T is not a class or a namespace", ctype);
10089 if (ctype == NULL_TREE)
10093 error ("virtual non-class function %qs", name);
10096 else if (sfk == sfk_constructor
10097 || sfk == sfk_destructor)
10099 error (funcdef_flag
10100 ? "%qs defined in a non-class scope"
10101 : "%qs declared in a non-class scope", name);
10106 /* Record presence of `static'. */
10107 publicp = (ctype != NULL_TREE
10108 || storage_class == sc_extern
10109 || storage_class != sc_static);
10111 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10112 virtualp, flags, memfn_quals, raises,
10114 publicp, inlinep | (2 * constexpr_p), sfk,
10116 template_count, in_namespace, attrlist,
10117 declarator->id_loc);
10118 if (decl == NULL_TREE)
10119 return error_mark_node;
10123 int invalid_static = 0;
10125 /* Don't allow a static member function in a class, and forbid
10126 declaring main to be static. */
10127 if (TREE_CODE (type) == METHOD_TYPE)
10129 permerror (input_location, "cannot declare member function %qD to have "
10130 "static linkage", decl);
10131 invalid_static = 1;
10133 else if (current_function_decl)
10135 /* FIXME need arm citation */
10136 error ("cannot declare static function inside another function");
10137 invalid_static = 1;
10140 if (invalid_static)
10143 storage_class = sc_none;
10149 /* It's a variable. */
10151 /* An uninitialized decl with `extern' is a reference. */
10152 decl = grokvardecl (type, unqualified_id,
10155 (type_quals & TYPE_QUAL_CONST) != 0,
10156 ctype ? ctype : in_namespace);
10157 bad_specifiers (decl, BSP_VAR, virtualp,
10158 memfn_quals != TYPE_UNQUALIFIED,
10159 inlinep, friendp, raises != NULL_TREE);
10163 DECL_CONTEXT (decl) = ctype;
10166 permerror (input_location, "%<static%> may not be used when defining "
10167 "(as opposed to declaring) a static data member");
10169 storage_class = sc_none;
10171 if (storage_class == sc_register && TREE_STATIC (decl))
10173 error ("static member %qD declared %<register%>", decl);
10174 storage_class = sc_none;
10176 if (storage_class == sc_extern && pedantic)
10178 pedwarn (input_location, OPT_pedantic,
10179 "cannot explicitly declare member %q#D to have "
10180 "extern linkage", decl);
10181 storage_class = sc_none;
10184 else if (constexpr_p && DECL_EXTERNAL (decl))
10186 error ("declaration of constexpr variable %qD is not a definition",
10188 constexpr_p = false;
10192 if (storage_class == sc_extern && initialized && !funcdef_flag)
10194 if (toplevel_bindings_p ())
10196 /* It's common practice (and completely valid) to have a const
10197 be initialized and declared extern. */
10198 if (!(type_quals & TYPE_QUAL_CONST))
10199 warning (0, "%qs initialized and declared %<extern%>", name);
10203 error ("%qs has both %<extern%> and initializer", name);
10204 return error_mark_node;
10208 /* Record `register' declaration for warnings on &
10209 and in case doing stupid register allocation. */
10211 if (storage_class == sc_register)
10212 DECL_REGISTER (decl) = 1;
10213 else if (storage_class == sc_extern)
10214 DECL_THIS_EXTERN (decl) = 1;
10215 else if (storage_class == sc_static)
10216 DECL_THIS_STATIC (decl) = 1;
10218 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10219 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10220 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10222 /* Record constancy and volatility on the DECL itself . There's
10223 no need to do this when processing a template; we'll do this
10224 for the instantiated declaration based on the type of DECL. */
10225 if (!processing_template_decl)
10226 cp_apply_type_quals_to_decl (type_quals, decl);
10232 /* Subroutine of start_function. Ensure that each of the parameter
10233 types (as listed in PARMS) is complete, as is required for a
10234 function definition. */
10237 require_complete_types_for_parms (tree parms)
10239 for (; parms; parms = DECL_CHAIN (parms))
10241 if (dependent_type_p (TREE_TYPE (parms)))
10243 if (!VOID_TYPE_P (TREE_TYPE (parms))
10244 && complete_type_or_else (TREE_TYPE (parms), parms))
10246 relayout_decl (parms);
10247 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10250 /* grokparms or complete_type_or_else will have already issued
10252 TREE_TYPE (parms) = error_mark_node;
10256 /* Returns nonzero if T is a local variable. */
10259 local_variable_p (const_tree t)
10261 if ((TREE_CODE (t) == VAR_DECL
10262 /* A VAR_DECL with a context that is a _TYPE is a static data
10264 && !TYPE_P (CP_DECL_CONTEXT (t))
10265 /* Any other non-local variable must be at namespace scope. */
10266 && !DECL_NAMESPACE_SCOPE_P (t))
10267 || (TREE_CODE (t) == PARM_DECL))
10273 /* Like local_variable_p, but suitable for use as a tree-walking
10277 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10278 void *data ATTRIBUTE_UNUSED)
10280 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10282 else if (TYPE_P (*tp))
10283 *walk_subtrees = 0;
10289 /* Check that ARG, which is a default-argument expression for a
10290 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10291 something goes wrong. DECL may also be a _TYPE node, rather than a
10292 DECL, if there is no DECL available. */
10295 check_default_argument (tree decl, tree arg)
10300 if (TREE_CODE (arg) == DEFAULT_ARG)
10301 /* We get a DEFAULT_ARG when looking at an in-class declaration
10302 with a default argument. Ignore the argument for now; we'll
10303 deal with it after the class is complete. */
10312 decl_type = TREE_TYPE (decl);
10314 if (arg == error_mark_node
10315 || decl == error_mark_node
10316 || TREE_TYPE (arg) == error_mark_node
10317 || decl_type == error_mark_node)
10318 /* Something already went wrong. There's no need to check
10320 return error_mark_node;
10322 /* [dcl.fct.default]
10324 A default argument expression is implicitly converted to the
10326 if (!TREE_TYPE (arg)
10327 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10330 error ("default argument for %q#D has type %qT",
10331 decl, TREE_TYPE (arg));
10333 error ("default argument for parameter of type %qT has type %qT",
10334 decl_type, TREE_TYPE (arg));
10336 return error_mark_node;
10339 /* [dcl.fct.default]
10341 Local variables shall not be used in default argument
10344 The keyword `this' shall not be used in a default argument of a
10345 member function. */
10346 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10349 error ("default argument %qE uses local variable %qD", arg, var);
10350 return error_mark_node;
10357 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10360 type_is_deprecated (tree type)
10362 enum tree_code code;
10363 if (TREE_DEPRECATED (type))
10365 if (TYPE_NAME (type)
10366 && TREE_DEPRECATED (TYPE_NAME (type)))
10369 /* Do warn about using typedefs to a deprecated class. */
10370 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10371 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10373 code = TREE_CODE (type);
10375 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10376 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10377 || code == METHOD_TYPE || code == ARRAY_TYPE)
10378 return type_is_deprecated (TREE_TYPE (type));
10380 if (TYPE_PTRMEMFUNC_P (type))
10381 return type_is_deprecated
10382 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10387 /* Decode the list of parameter types for a function type.
10388 Given the list of things declared inside the parens,
10389 return a list of types.
10391 If this parameter does not end with an ellipsis, we append
10394 *PARMS is set to the chain of PARM_DECLs created. */
10397 grokparms (tree parmlist, tree *parms)
10399 tree result = NULL_TREE;
10400 tree decls = NULL_TREE;
10404 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10406 tree type = NULL_TREE;
10407 tree init = TREE_PURPOSE (parm);
10408 tree decl = TREE_VALUE (parm);
10409 const char *errmsg;
10411 if (parm == void_list_node)
10414 if (! decl || TREE_TYPE (decl) == error_mark_node)
10417 type = TREE_TYPE (decl);
10418 if (VOID_TYPE_P (type))
10420 if (same_type_p (type, void_type_node)
10421 && DECL_SELF_REFERENCE_P (type)
10422 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10423 /* this is a parmlist of `(void)', which is ok. */
10425 cxx_incomplete_type_error (decl, type);
10426 /* It's not a good idea to actually create parameters of
10427 type `void'; other parts of the compiler assume that a
10428 void type terminates the parameter list. */
10429 type = error_mark_node;
10430 TREE_TYPE (decl) = error_mark_node;
10433 if (type != error_mark_node
10434 && TYPE_FOR_JAVA (type)
10435 && MAYBE_CLASS_TYPE_P (type))
10437 error ("parameter %qD has Java class type", decl);
10438 type = error_mark_node;
10439 TREE_TYPE (decl) = error_mark_node;
10443 if (type != error_mark_node
10444 && (errmsg = targetm.invalid_parameter_type (type)))
10447 type = error_mark_node;
10448 TREE_TYPE (decl) = error_mark_node;
10451 if (type != error_mark_node)
10453 if (deprecated_state != DEPRECATED_SUPPRESS)
10455 tree deptype = type_is_deprecated (type);
10457 warn_deprecated_use (deptype, NULL_TREE);
10460 /* Top-level qualifiers on the parameters are
10461 ignored for function types. */
10462 type = cp_build_qualified_type (type, 0);
10463 if (TREE_CODE (type) == METHOD_TYPE)
10465 error ("parameter %qD invalidly declared method type", decl);
10466 type = build_pointer_type (type);
10467 TREE_TYPE (decl) = type;
10469 else if (abstract_virtuals_error (decl, type))
10470 any_error = 1; /* Seems like a good idea. */
10471 else if (POINTER_TYPE_P (type))
10473 /* [dcl.fct]/6, parameter types cannot contain pointers
10474 (references) to arrays of unknown bound. */
10475 tree t = TREE_TYPE (type);
10476 int ptr = TYPE_PTR_P (type);
10480 if (TYPE_PTR_P (t))
10482 else if (TREE_CODE (t) != ARRAY_TYPE)
10484 else if (!TYPE_DOMAIN (t))
10488 if (TREE_CODE (t) == ARRAY_TYPE)
10490 ? G_("parameter %qD includes pointer to array of "
10491 "unknown bound %qT")
10492 : G_("parameter %qD includes reference to array of "
10493 "unknown bound %qT"),
10499 else if (init && !processing_template_decl)
10500 init = check_default_argument (decl, init);
10503 if (TREE_CODE (decl) == PARM_DECL
10504 && FUNCTION_PARAMETER_PACK_P (decl)
10505 && TREE_CHAIN (parm)
10506 && TREE_CHAIN (parm) != void_list_node)
10507 error ("parameter packs must be at the end of the parameter list");
10509 DECL_CHAIN (decl) = decls;
10511 result = tree_cons (init, type, result);
10513 decls = nreverse (decls);
10514 result = nreverse (result);
10516 result = chainon (result, void_list_node);
10523 /* D is a constructor or overloaded `operator='.
10525 Let T be the class in which D is declared. Then, this function
10528 -1 if D's is an ill-formed constructor or copy assignment operator
10529 whose first parameter is of type `T'.
10530 0 if D is not a copy constructor or copy assignment
10532 1 if D is a copy constructor or copy assignment operator whose
10533 first parameter is a reference to non-const qualified T.
10534 2 if D is a copy constructor or copy assignment operator whose
10535 first parameter is a reference to const qualified T.
10537 This function can be used as a predicate. Positive values indicate
10538 a copy constructor and nonzero values indicate a copy assignment
10542 copy_fn_p (const_tree d)
10548 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10550 if (TREE_CODE (d) == TEMPLATE_DECL
10551 || (DECL_TEMPLATE_INFO (d)
10552 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10553 /* Instantiations of template member functions are never copy
10554 functions. Note that member functions of templated classes are
10555 represented as template functions internally, and we must
10556 accept those as copy functions. */
10559 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10563 arg_type = TREE_VALUE (args);
10564 if (arg_type == error_mark_node)
10567 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10569 /* Pass by value copy assignment operator. */
10572 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10573 && !TYPE_REF_IS_RVALUE (arg_type)
10574 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10576 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10582 args = TREE_CHAIN (args);
10584 if (args && args != void_list_node && !TREE_PURPOSE (args))
10585 /* There are more non-optional args. */
10591 /* D is a constructor or overloaded `operator='.
10593 Let T be the class in which D is declared. Then, this function
10594 returns true when D is a move constructor or move assignment
10595 operator, false otherwise. */
10598 move_fn_p (const_tree d)
10602 bool result = false;
10604 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10606 if (cxx_dialect == cxx98)
10607 /* There are no move constructors if we are in C++98 mode. */
10610 if (TREE_CODE (d) == TEMPLATE_DECL
10611 || (DECL_TEMPLATE_INFO (d)
10612 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10613 /* Instantiations of template member functions are never copy
10614 functions. Note that member functions of templated classes are
10615 represented as template functions internally, and we must
10616 accept those as copy functions. */
10619 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10623 arg_type = TREE_VALUE (args);
10624 if (arg_type == error_mark_node)
10627 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10628 && TYPE_REF_IS_RVALUE (arg_type)
10629 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10633 args = TREE_CHAIN (args);
10635 if (args && args != void_list_node && !TREE_PURPOSE (args))
10636 /* There are more non-optional args. */
10642 /* Remember any special properties of member function DECL. */
10645 grok_special_member_properties (tree decl)
10649 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10652 class_type = DECL_CONTEXT (decl);
10653 if (DECL_CONSTRUCTOR_P (decl))
10655 int ctor = copy_fn_p (decl);
10657 if (!DECL_ARTIFICIAL (decl))
10658 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10664 A non-template constructor for class X is a copy
10665 constructor if its first parameter is of type X&, const
10666 X&, volatile X& or const volatile X&, and either there
10667 are no other parameters or else all other parameters have
10668 default arguments. */
10669 TYPE_HAS_COPY_CTOR (class_type) = 1;
10670 if (user_provided_p (decl))
10671 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10673 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10675 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10677 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10678 if (user_provided_p (decl))
10679 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10681 else if (move_fn_p (decl) && user_provided_p (decl))
10682 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10683 else if (is_list_ctor (decl))
10684 TYPE_HAS_LIST_CTOR (class_type) = 1;
10686 if (DECL_DECLARED_CONSTEXPR_P (decl)
10687 && !copy_fn_p (decl) && !move_fn_p (decl))
10688 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10690 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10694 A non-template assignment operator for class X is a copy
10695 assignment operator if its parameter is of type X, X&, const
10696 X&, volatile X& or const volatile X&. */
10698 int assop = copy_fn_p (decl);
10702 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10703 if (user_provided_p (decl))
10704 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10706 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10708 else if (move_fn_p (decl) && user_provided_p (decl))
10709 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10711 /* Destructors are handled in check_methods. */
10714 /* Check a constructor DECL has the correct form. Complains
10715 if the class has a constructor of the form X(X). */
10718 grok_ctor_properties (const_tree ctype, const_tree decl)
10720 int ctor_parm = copy_fn_p (decl);
10726 A declaration of a constructor for a class X is ill-formed if
10727 its first parameter is of type (optionally cv-qualified) X
10728 and either there are no other parameters or else all other
10729 parameters have default arguments.
10731 We *don't* complain about member template instantiations that
10732 have this form, though; they can occur as we try to decide
10733 what constructor to use during overload resolution. Since
10734 overload resolution will never prefer such a constructor to
10735 the non-template copy constructor (which is either explicitly
10736 or implicitly defined), there's no need to worry about their
10737 existence. Theoretically, they should never even be
10738 instantiated, but that's hard to forestall. */
10739 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10747 /* An operator with this code is unary, but can also be binary. */
10750 ambi_op_p (enum tree_code code)
10752 return (code == INDIRECT_REF
10753 || code == ADDR_EXPR
10754 || code == UNARY_PLUS_EXPR
10755 || code == NEGATE_EXPR
10756 || code == PREINCREMENT_EXPR
10757 || code == PREDECREMENT_EXPR);
10760 /* An operator with this name can only be unary. */
10763 unary_op_p (enum tree_code code)
10765 return (code == TRUTH_NOT_EXPR
10766 || code == BIT_NOT_EXPR
10767 || code == COMPONENT_REF
10768 || code == TYPE_EXPR);
10771 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10772 errors are issued for invalid declarations. */
10775 grok_op_properties (tree decl, bool complain)
10777 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10779 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10780 tree name = DECL_NAME (decl);
10781 enum tree_code operator_code;
10786 /* Count the number of arguments and check for ellipsis. */
10787 for (argtype = argtypes, arity = 0;
10788 argtype && argtype != void_list_node;
10789 argtype = TREE_CHAIN (argtype))
10791 ellipsis_p = !argtype;
10793 class_type = DECL_CONTEXT (decl);
10794 if (class_type && !CLASS_TYPE_P (class_type))
10795 class_type = NULL_TREE;
10797 if (DECL_CONV_FN_P (decl))
10798 operator_code = TYPE_EXPR;
10802 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10803 if (ansi_opname (CODE) == name) \
10805 operator_code = (CODE); \
10808 else if (ansi_assopname (CODE) == name) \
10810 operator_code = (CODE); \
10811 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10815 #include "operators.def"
10816 #undef DEF_OPERATOR
10818 gcc_unreachable ();
10821 gcc_assert (operator_code != MAX_TREE_CODES);
10822 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10825 switch (operator_code)
10828 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10832 TYPE_GETS_DELETE (class_type) |= 1;
10836 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10839 case VEC_DELETE_EXPR:
10840 TYPE_GETS_DELETE (class_type) |= 2;
10847 /* [basic.std.dynamic.allocation]/1:
10849 A program is ill-formed if an allocation function is declared
10850 in a namespace scope other than global scope or declared static
10853 The same also holds true for deallocation functions. */
10854 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10855 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10857 if (DECL_NAMESPACE_SCOPE_P (decl))
10859 if (CP_DECL_CONTEXT (decl) != global_namespace)
10861 error ("%qD may not be declared within a namespace", decl);
10864 else if (!TREE_PUBLIC (decl))
10866 error ("%qD may not be declared as static", decl);
10872 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10874 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10875 DECL_IS_OPERATOR_NEW (decl) = 1;
10877 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10878 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10881 /* An operator function must either be a non-static member function
10882 or have at least one parameter of a class, a reference to a class,
10883 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10884 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10886 if (operator_code == TYPE_EXPR
10887 || operator_code == CALL_EXPR
10888 || operator_code == COMPONENT_REF
10889 || operator_code == ARRAY_REF
10890 || operator_code == NOP_EXPR)
10892 error ("%qD must be a nonstatic member function", decl);
10899 if (DECL_STATIC_FUNCTION_P (decl))
10901 error ("%qD must be either a non-static member "
10902 "function or a non-member function", decl);
10906 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10908 tree arg = non_reference (TREE_VALUE (p));
10909 if (arg == error_mark_node)
10912 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10913 because these checks are performed even on
10914 template functions. */
10915 if (MAYBE_CLASS_TYPE_P (arg)
10916 || TREE_CODE (arg) == ENUMERAL_TYPE)
10920 if (!p || p == void_list_node)
10923 error ("%qD must have an argument of class or "
10924 "enumerated type", decl);
10930 /* There are no restrictions on the arguments to an overloaded
10932 if (operator_code == CALL_EXPR)
10935 /* Warn about conversion operators that will never be used. */
10936 if (IDENTIFIER_TYPENAME_P (name)
10937 && ! DECL_TEMPLATE_INFO (decl)
10939 /* Warn only declaring the function; there is no need to
10940 warn again about out-of-class definitions. */
10941 && class_type == current_class_type)
10943 tree t = TREE_TYPE (name);
10944 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10947 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10949 if (TREE_CODE (t) == VOID_TYPE)
10950 warning (OPT_Wconversion,
10952 ? G_("conversion to a reference to void "
10953 "will never use a type conversion operator")
10954 : G_("conversion to void "
10955 "will never use a type conversion operator"));
10956 else if (class_type)
10958 if (t == class_type)
10959 warning (OPT_Wconversion,
10961 ? G_("conversion to a reference to the same type "
10962 "will never use a type conversion operator")
10963 : G_("conversion to the same type "
10964 "will never use a type conversion operator"));
10965 /* Don't force t to be complete here. */
10966 else if (MAYBE_CLASS_TYPE_P (t)
10967 && COMPLETE_TYPE_P (t)
10968 && DERIVED_FROM_P (t, class_type))
10969 warning (OPT_Wconversion,
10971 ? G_("conversion to a reference to a base class "
10972 "will never use a type conversion operator")
10973 : G_("conversion to a base class "
10974 "will never use a type conversion operator"));
10979 if (operator_code == COND_EXPR)
10982 error ("ISO C++ prohibits overloading operator ?:");
10985 else if (ellipsis_p)
10987 error ("%qD must not have variable number of arguments", decl);
10990 else if (ambi_op_p (operator_code))
10993 /* We pick the one-argument operator codes by default, so
10994 we don't have to change anything. */
10996 else if (arity == 2)
10998 /* If we thought this was a unary operator, we now know
10999 it to be a binary operator. */
11000 switch (operator_code)
11003 operator_code = MULT_EXPR;
11007 operator_code = BIT_AND_EXPR;
11010 case UNARY_PLUS_EXPR:
11011 operator_code = PLUS_EXPR;
11015 operator_code = MINUS_EXPR;
11018 case PREINCREMENT_EXPR:
11019 operator_code = POSTINCREMENT_EXPR;
11022 case PREDECREMENT_EXPR:
11023 operator_code = POSTDECREMENT_EXPR;
11027 gcc_unreachable ();
11030 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11032 if ((operator_code == POSTINCREMENT_EXPR
11033 || operator_code == POSTDECREMENT_EXPR)
11034 && ! processing_template_decl
11035 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11038 error ("postfix %qD must take %<int%> as its argument",
11041 error ("postfix %qD must take %<int%> as its second "
11049 error ("%qD must take either zero or one argument", decl);
11051 error ("%qD must take either one or two arguments", decl);
11055 /* More Effective C++ rule 6. */
11057 && (operator_code == POSTINCREMENT_EXPR
11058 || operator_code == POSTDECREMENT_EXPR
11059 || operator_code == PREINCREMENT_EXPR
11060 || operator_code == PREDECREMENT_EXPR))
11062 tree arg = TREE_VALUE (argtypes);
11063 tree ret = TREE_TYPE (TREE_TYPE (decl));
11064 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11065 arg = TREE_TYPE (arg);
11066 arg = TYPE_MAIN_VARIANT (arg);
11067 if (operator_code == PREINCREMENT_EXPR
11068 || operator_code == PREDECREMENT_EXPR)
11070 if (TREE_CODE (ret) != REFERENCE_TYPE
11071 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11073 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11074 build_reference_type (arg));
11078 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11079 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11083 else if (unary_op_p (operator_code))
11088 error ("%qD must take %<void%>", decl);
11090 error ("%qD must take exactly one argument", decl);
11094 else /* if (binary_op_p (operator_code)) */
11099 error ("%qD must take exactly one argument", decl);
11101 error ("%qD must take exactly two arguments", decl);
11105 /* More Effective C++ rule 7. */
11107 && (operator_code == TRUTH_ANDIF_EXPR
11108 || operator_code == TRUTH_ORIF_EXPR
11109 || operator_code == COMPOUND_EXPR))
11110 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11114 /* Effective C++ rule 23. */
11117 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11118 && (operator_code == PLUS_EXPR
11119 || operator_code == MINUS_EXPR
11120 || operator_code == TRUNC_DIV_EXPR
11121 || operator_code == MULT_EXPR
11122 || operator_code == TRUNC_MOD_EXPR)
11123 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11124 warning (OPT_Weffc__, "%qD should return by value", decl);
11126 /* [over.oper]/8 */
11127 for (; argtypes && argtypes != void_list_node;
11128 argtypes = TREE_CHAIN (argtypes))
11129 if (TREE_PURPOSE (argtypes))
11131 TREE_PURPOSE (argtypes) = NULL_TREE;
11132 if (operator_code == POSTINCREMENT_EXPR
11133 || operator_code == POSTDECREMENT_EXPR)
11135 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11140 error ("%qD cannot have default arguments", decl);
11148 /* Return a string giving the keyword associate with CODE. */
11150 static const char *
11151 tag_name (enum tag_types code)
11163 case typename_type:
11166 gcc_unreachable ();
11170 /* Name lookup in an elaborated-type-specifier (after the keyword
11171 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11172 elaborated-type-specifier is invalid, issue a diagnostic and return
11173 error_mark_node; otherwise, return the *_TYPE to which it referred.
11174 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11177 check_elaborated_type_specifier (enum tag_types tag_code,
11179 bool allow_template_p)
11185 struct S { struct S *p; };
11187 name lookup will find the TYPE_DECL for the implicit "S::S"
11188 typedef. Adjust for that here. */
11189 if (DECL_SELF_REFERENCE_P (decl))
11190 decl = TYPE_NAME (TREE_TYPE (decl));
11192 type = TREE_TYPE (decl);
11194 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11195 is false for this case as well. */
11196 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11198 error ("using template type parameter %qT after %qs",
11199 type, tag_name (tag_code));
11200 return error_mark_node;
11204 If the identifier resolves to a typedef-name or a template
11205 type-parameter, the elaborated-type-specifier is ill-formed.
11207 In other words, the only legitimate declaration to use in the
11208 elaborated type specifier is the implicit typedef created when
11209 the type is declared. */
11210 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11211 && !DECL_SELF_REFERENCE_P (decl)
11212 && tag_code != typename_type)
11214 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11215 error ("%q+D has a previous declaration here", decl);
11216 return error_mark_node;
11218 else if (TREE_CODE (type) != RECORD_TYPE
11219 && TREE_CODE (type) != UNION_TYPE
11220 && tag_code != enum_type
11221 && tag_code != typename_type)
11223 error ("%qT referred to as %qs", type, tag_name (tag_code));
11224 error ("%q+T has a previous declaration here", type);
11225 return error_mark_node;
11227 else if (TREE_CODE (type) != ENUMERAL_TYPE
11228 && tag_code == enum_type)
11230 error ("%qT referred to as enum", type);
11231 error ("%q+T has a previous declaration here", type);
11232 return error_mark_node;
11234 else if (!allow_template_p
11235 && TREE_CODE (type) == RECORD_TYPE
11236 && CLASSTYPE_IS_TEMPLATE (type))
11238 /* If a class template appears as elaborated type specifier
11239 without a template header such as:
11241 template <class T> class C {};
11242 void f(class C); // No template header here
11244 then the required template argument is missing. */
11245 error ("template argument required for %<%s %T%>",
11246 tag_name (tag_code),
11247 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11248 return error_mark_node;
11254 /* Lookup NAME in elaborate type specifier in scope according to
11255 SCOPE and issue diagnostics if necessary.
11256 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11257 found, and ERROR_MARK_NODE for type error. */
11260 lookup_and_check_tag (enum tag_types tag_code, tree name,
11261 tag_scope scope, bool template_header_p)
11265 if (scope == ts_global)
11267 /* First try ordinary name lookup, ignoring hidden class name
11268 injected via friend declaration. */
11269 decl = lookup_name_prefer_type (name, 2);
11270 /* If that fails, the name will be placed in the smallest
11271 non-class, non-function-prototype scope according to 3.3.1/5.
11272 We may already have a hidden name declared as friend in this
11273 scope. So lookup again but not ignoring hidden names.
11274 If we find one, that name will be made visible rather than
11275 creating a new tag. */
11277 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11280 decl = lookup_type_scope (name, scope);
11282 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11283 decl = DECL_TEMPLATE_RESULT (decl);
11285 if (decl && TREE_CODE (decl) == TYPE_DECL)
11287 /* Look for invalid nested type:
11291 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11293 error ("%qD has the same name as the class in which it is "
11296 return error_mark_node;
11299 /* Two cases we need to consider when deciding if a class
11300 template is allowed as an elaborated type specifier:
11301 1. It is a self reference to its own class.
11302 2. It comes with a template header.
11306 template <class T> class C {
11307 class C *c1; // DECL_SELF_REFERENCE_P is true
11310 template <class U> class C; // template_header_p is true
11311 template <class T> class C<T>::D {
11312 class C *c2; // DECL_SELF_REFERENCE_P is true
11315 t = check_elaborated_type_specifier (tag_code,
11318 | DECL_SELF_REFERENCE_P (decl));
11321 else if (decl && TREE_CODE (decl) == TREE_LIST)
11323 error ("reference to %qD is ambiguous", name);
11324 print_candidates (decl);
11325 return error_mark_node;
11331 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11332 Define the tag as a forward-reference if it is not defined.
11334 If a declaration is given, process it here, and report an error if
11335 multiple declarations are not identical.
11337 SCOPE is TS_CURRENT when this is also a definition. Only look in
11338 the current frame for the name (since C++ allows new names in any
11339 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11340 declaration. Only look beginning from the current scope outward up
11341 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11343 TEMPLATE_HEADER_P is true when this declaration is preceded by
11344 a set of template parameters. */
11347 xref_tag_1 (enum tag_types tag_code, tree name,
11348 tag_scope scope, bool template_header_p)
11350 enum tree_code code;
11352 tree context = NULL_TREE;
11354 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11360 code = RECORD_TYPE;
11366 code = ENUMERAL_TYPE;
11369 gcc_unreachable ();
11372 /* In case of anonymous name, xref_tag is only called to
11373 make type node and push name. Name lookup is not required. */
11374 if (ANON_AGGRNAME_P (name))
11377 t = lookup_and_check_tag (tag_code, name,
11378 scope, template_header_p);
11380 if (t == error_mark_node)
11381 return error_mark_node;
11383 if (scope != ts_current && t && current_class_type
11384 && template_class_depth (current_class_type)
11385 && template_header_p)
11387 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11388 definition of this tag. Since, in addition, we are currently
11389 processing a (member) template declaration of a template
11390 class, we must be very careful; consider:
11397 { template <class V>
11398 friend struct S1; };
11400 Here, the S2::S1 declaration should not be confused with the
11401 outer declaration. In particular, the inner version should
11402 have a template parameter of level 2, not level 1. This
11403 would be particularly important if the member declaration
11406 template <class V = U> friend struct S1;
11408 say, when we should tsubst into `U' when instantiating
11409 S2. On the other hand, when presented with:
11419 we must find the inner binding eventually. We
11420 accomplish this by making sure that the new type we
11421 create to represent this declaration has the right
11423 context = TYPE_CONTEXT (t);
11429 /* If no such tag is yet defined, create a forward-reference node
11430 and record it as the "definition".
11431 When a real declaration of this type is found,
11432 the forward-reference will be altered into a real type. */
11433 if (code == ENUMERAL_TYPE)
11435 error ("use of enum %q#D without previous declaration", name);
11436 return error_mark_node;
11440 t = make_class_type (code);
11441 TYPE_CONTEXT (t) = context;
11442 t = pushtag (name, t, scope);
11447 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11449 if (!redeclare_class_template (t, current_template_parms))
11450 return error_mark_node;
11452 else if (!processing_template_decl
11453 && CLASS_TYPE_P (t)
11454 && CLASSTYPE_IS_TEMPLATE (t))
11456 error ("redeclaration of %qT as a non-template", t);
11457 error ("previous declaration %q+D", t);
11458 return error_mark_node;
11461 /* Make injected friend class visible. */
11462 if (scope != ts_within_enclosing_non_class
11463 && hidden_name_p (TYPE_NAME (t)))
11465 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11466 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11468 if (TYPE_TEMPLATE_INFO (t))
11470 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11471 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11479 /* Wrapper for xref_tag_1. */
11482 xref_tag (enum tag_types tag_code, tree name,
11483 tag_scope scope, bool template_header_p)
11486 timevar_start (TV_NAME_LOOKUP);
11487 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11488 timevar_stop (TV_NAME_LOOKUP);
11494 xref_tag_from_type (tree old, tree id, tag_scope scope)
11496 enum tag_types tag_kind;
11498 if (TREE_CODE (old) == RECORD_TYPE)
11499 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11501 tag_kind = union_type;
11503 if (id == NULL_TREE)
11504 id = TYPE_IDENTIFIER (old);
11506 return xref_tag (tag_kind, id, scope, false);
11509 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11510 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11511 access_* node, and the TREE_VALUE is the type of the base-class.
11512 Non-NULL TREE_TYPE indicates virtual inheritance.
11514 Returns true if the binfo hierarchy was successfully created,
11515 false if an error was detected. */
11518 xref_basetypes (tree ref, tree base_list)
11521 tree binfo, base_binfo;
11522 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11523 unsigned max_bases = 0; /* Maximum direct bases. */
11525 tree default_access;
11526 tree igo_prev; /* Track Inheritance Graph Order. */
11528 if (ref == error_mark_node)
11531 /* The base of a derived class is private by default, all others are
11533 default_access = (TREE_CODE (ref) == RECORD_TYPE
11534 && CLASSTYPE_DECLARED_CLASS (ref)
11535 ? access_private_node : access_public_node);
11537 /* First, make sure that any templates in base-classes are
11538 instantiated. This ensures that if we call ourselves recursively
11539 we do not get confused about which classes are marked and which
11541 basep = &base_list;
11544 tree basetype = TREE_VALUE (*basep);
11546 if (!(processing_template_decl && uses_template_parms (basetype))
11547 && !complete_type_or_else (basetype, NULL))
11548 /* An incomplete type. Remove it from the list. */
11549 *basep = TREE_CHAIN (*basep);
11553 if (TREE_TYPE (*basep))
11555 if (CLASS_TYPE_P (basetype))
11556 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11557 basep = &TREE_CHAIN (*basep);
11561 TYPE_MARKED_P (ref) = 1;
11563 /* The binfo slot should be empty, unless this is an (ill-formed)
11565 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11567 error ("redefinition of %q#T", ref);
11571 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11573 binfo = make_tree_binfo (max_bases);
11575 TYPE_BINFO (ref) = binfo;
11576 BINFO_OFFSET (binfo) = size_zero_node;
11577 BINFO_TYPE (binfo) = ref;
11579 /* Apply base-class info set up to the variants of this type. */
11580 fixup_type_variants (ref);
11584 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11585 /* An aggregate cannot have baseclasses. */
11586 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11588 if (TREE_CODE (ref) == UNION_TYPE)
11590 error ("derived union %qT invalid", ref);
11597 if (TYPE_FOR_JAVA (ref))
11599 error ("Java class %qT cannot have multiple bases", ref);
11606 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11608 if (TYPE_FOR_JAVA (ref))
11610 error ("Java class %qT cannot have virtual bases", ref);
11615 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11617 tree access = TREE_PURPOSE (base_list);
11618 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11619 tree basetype = TREE_VALUE (base_list);
11621 if (access == access_default_node)
11622 access = default_access;
11624 if (PACK_EXPANSION_P (basetype))
11625 basetype = PACK_EXPANSION_PATTERN (basetype);
11626 if (TREE_CODE (basetype) == TYPE_DECL)
11627 basetype = TREE_TYPE (basetype);
11628 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11630 error ("base type %qT fails to be a struct or class type",
11635 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11636 TYPE_FOR_JAVA (ref) = 1;
11638 base_binfo = NULL_TREE;
11639 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11641 base_binfo = TYPE_BINFO (basetype);
11642 /* The original basetype could have been a typedef'd type. */
11643 basetype = BINFO_TYPE (base_binfo);
11645 /* Inherit flags from the base. */
11646 TYPE_HAS_NEW_OPERATOR (ref)
11647 |= TYPE_HAS_NEW_OPERATOR (basetype);
11648 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11649 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11650 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11651 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11652 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11653 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11654 CLASSTYPE_REPEATED_BASE_P (ref)
11655 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11658 /* We must do this test after we've seen through a typedef
11660 if (TYPE_MARKED_P (basetype))
11662 if (basetype == ref)
11663 error ("recursive type %qT undefined", basetype);
11665 error ("duplicate base type %qT invalid", basetype);
11669 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11670 /* Regenerate the pack expansion for the bases. */
11671 basetype = make_pack_expansion (basetype);
11673 TYPE_MARKED_P (basetype) = 1;
11675 base_binfo = copy_binfo (base_binfo, basetype, ref,
11676 &igo_prev, via_virtual);
11677 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11678 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11680 BINFO_BASE_APPEND (binfo, base_binfo);
11681 BINFO_BASE_ACCESS_APPEND (binfo, access);
11684 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11685 /* If we have space in the vbase vector, we must have shared at
11686 least one of them, and are therefore diamond shaped. */
11687 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11689 /* Unmark all the types. */
11690 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11691 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11692 TYPE_MARKED_P (ref) = 0;
11694 /* Now see if we have a repeated base type. */
11695 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11697 for (base_binfo = binfo; base_binfo;
11698 base_binfo = TREE_CHAIN (base_binfo))
11700 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11702 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11705 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11707 for (base_binfo = binfo; base_binfo;
11708 base_binfo = TREE_CHAIN (base_binfo))
11709 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11710 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11719 /* Copies the enum-related properties from type SRC to type DST.
11720 Used with the underlying type of an enum and the enum itself. */
11722 copy_type_enum (tree dst, tree src)
11724 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11725 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11726 TYPE_SIZE (dst) = TYPE_SIZE (src);
11727 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11728 SET_TYPE_MODE (dst, TYPE_MODE (src));
11729 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11730 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11731 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11732 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11735 /* Begin compiling the definition of an enumeration type.
11738 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11740 UNDERLYING_TYPE is the type that will be used as the storage for
11741 the enumeration type. This should be NULL_TREE if no storage type
11744 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11746 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11748 Returns the type object, as yet incomplete.
11749 Also records info about it so that build_enumerator
11750 may be used to declare the individual values as they are read. */
11753 start_enum (tree name, tree enumtype, tree underlying_type,
11754 bool scoped_enum_p, bool *is_new)
11756 tree prevtype = NULL_TREE;
11757 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11761 /* [C++0x dcl.enum]p5:
11763 If not explicitly specified, the underlying type of a scoped
11764 enumeration type is int. */
11765 if (!underlying_type && scoped_enum_p)
11766 underlying_type = integer_type_node;
11768 if (underlying_type)
11769 underlying_type = cv_unqualified (underlying_type);
11771 /* If this is the real definition for a previous forward reference,
11772 fill in the contents in the same object that used to be the
11773 forward reference. */
11775 enumtype = lookup_and_check_tag (enum_type, name,
11776 /*tag_scope=*/ts_current,
11777 /*template_header_p=*/false);
11779 /* In case of a template_decl, the only check that should be deferred
11780 to instantiation time is the comparison of underlying types. */
11781 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11783 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11785 error_at (input_location, "scoped/unscoped mismatch "
11786 "in enum %q#T", enumtype);
11787 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11788 "previous definition here");
11789 enumtype = error_mark_node;
11791 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11793 error_at (input_location, "underlying type mismatch "
11794 "in enum %q#T", enumtype);
11795 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11796 "previous definition here");
11797 enumtype = error_mark_node;
11799 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11800 && !dependent_type_p (underlying_type)
11801 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11802 && !same_type_p (underlying_type,
11803 ENUM_UNDERLYING_TYPE (enumtype)))
11805 error_at (input_location, "different underlying type "
11806 "in enum %q#T", enumtype);
11807 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11808 "previous definition here");
11809 underlying_type = NULL_TREE;
11813 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11814 || processing_template_decl)
11816 /* In case of error, make a dummy enum to allow parsing to
11818 if (enumtype == error_mark_node)
11820 name = make_anon_name ();
11821 enumtype = NULL_TREE;
11824 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11825 of an opaque enum, or an opaque enum of an already defined
11826 enumeration (C++0x only).
11827 In any other case, it'll be NULL_TREE. */
11833 prevtype = enumtype;
11834 enumtype = cxx_make_type (ENUMERAL_TYPE);
11835 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11836 if (enumtype == error_mark_node)
11837 return error_mark_node;
11839 /* The enum is considered opaque until the opening '{' of the
11840 enumerator list. */
11841 SET_OPAQUE_ENUM_P (enumtype, true);
11842 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11845 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11847 if (underlying_type)
11849 if (CP_INTEGRAL_TYPE_P (underlying_type))
11851 copy_type_enum (enumtype, underlying_type);
11852 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11854 else if (dependent_type_p (underlying_type))
11855 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11857 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11858 underlying_type, enumtype);
11861 /* If into a template class, the returned enum is always the first
11862 declaration (opaque or not) seen. This way all the references to
11863 this type will be to the same declaration. The following ones are used
11864 only to check for definition errors. */
11865 if (prevtype && processing_template_decl)
11871 /* After processing and defining all the values of an enumeration type,
11872 install their decls in the enumeration type.
11873 ENUMTYPE is the type object. */
11876 finish_enum_value_list (tree enumtype)
11879 tree underlying_type;
11882 tree minnode, maxnode;
11885 bool fixed_underlying_type_p
11886 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11888 /* We built up the VALUES in reverse order. */
11889 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11891 /* For an enum defined in a template, just set the type of the values;
11892 all further processing is postponed until the template is
11893 instantiated. We need to set the type so that tsubst of a CONST_DECL
11895 if (processing_template_decl)
11897 for (values = TYPE_VALUES (enumtype);
11899 values = TREE_CHAIN (values))
11900 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11904 /* Determine the minimum and maximum values of the enumerators. */
11905 if (TYPE_VALUES (enumtype))
11907 minnode = maxnode = NULL_TREE;
11909 for (values = TYPE_VALUES (enumtype);
11911 values = TREE_CHAIN (values))
11913 decl = TREE_VALUE (values);
11915 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11916 each enumerator has the type of its enumeration. Prior to the
11917 closing brace, the type of each enumerator is the type of its
11918 initializing value. */
11919 TREE_TYPE (decl) = enumtype;
11921 /* Update the minimum and maximum values, if appropriate. */
11922 value = DECL_INITIAL (decl);
11923 if (value == error_mark_node)
11924 value = integer_zero_node;
11925 /* Figure out what the minimum and maximum values of the
11926 enumerators are. */
11928 minnode = maxnode = value;
11929 else if (tree_int_cst_lt (maxnode, value))
11931 else if (tree_int_cst_lt (value, minnode))
11938 If the enumerator-list is empty, the underlying type is as if
11939 the enumeration had a single enumerator with value 0. */
11940 minnode = maxnode = integer_zero_node;
11942 if (!fixed_underlying_type_p)
11944 /* Compute the number of bits require to represent all values of the
11945 enumeration. We must do this before the type of MINNODE and
11946 MAXNODE are transformed, since tree_int_cst_min_precision relies
11947 on the TREE_TYPE of the value it is passed. */
11948 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11949 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11950 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11951 int precision = MAX (lowprec, highprec);
11953 bool use_short_enum;
11955 /* Determine the underlying type of the enumeration.
11959 The underlying type of an enumeration is an integral type that
11960 can represent all the enumerator values defined in the
11961 enumeration. It is implementation-defined which integral type is
11962 used as the underlying type for an enumeration except that the
11963 underlying type shall not be larger than int unless the value of
11964 an enumerator cannot fit in an int or unsigned int.
11966 We use "int" or an "unsigned int" as the underlying type, even if
11967 a smaller integral type would work, unless the user has
11968 explicitly requested that we use the smallest possible type. The
11969 user can request that for all enumerations with a command line
11970 flag, or for just one enumeration with an attribute. */
11972 use_short_enum = flag_short_enums
11973 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11975 for (itk = (use_short_enum ? itk_char : itk_int);
11979 underlying_type = integer_types[itk];
11980 if (underlying_type != NULL_TREE
11981 && TYPE_PRECISION (underlying_type) >= precision
11982 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11985 if (itk == itk_none)
11989 IF no integral type can represent all the enumerator values, the
11990 enumeration is ill-formed. */
11991 error ("no integral type can represent all of the enumerator values "
11992 "for %qT", enumtype);
11993 precision = TYPE_PRECISION (long_long_integer_type_node);
11994 underlying_type = integer_types[itk_unsigned_long_long];
11999 The value of sizeof() applied to an enumeration type, an object
12000 of an enumeration type, or an enumerator, is the value of sizeof()
12001 applied to the underlying type. */
12002 copy_type_enum (enumtype, underlying_type);
12004 /* Compute the minimum and maximum values for the type.
12008 For an enumeration where emin is the smallest enumerator and emax
12009 is the largest, the values of the enumeration are the values of the
12010 underlying type in the range bmin to bmax, where bmin and bmax are,
12011 respectively, the smallest and largest values of the smallest bit-
12012 field that can store emin and emax. */
12014 /* The middle-end currently assumes that types with TYPE_PRECISION
12015 narrower than their underlying type are suitably zero or sign
12016 extended to fill their mode. Similarly, it assumes that the front
12017 end assures that a value of a particular type must be within
12018 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12020 We used to set these fields based on bmin and bmax, but that led
12021 to invalid assumptions like optimizing away bounds checking. So
12022 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12023 TYPE_MAX_VALUE to the values for the mode above and only restrict
12024 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12025 ENUM_UNDERLYING_TYPE (enumtype)
12026 = build_distinct_type_copy (underlying_type);
12027 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12028 set_min_and_max_values_for_integral_type
12029 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12031 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12032 if (flag_strict_enums)
12033 set_min_and_max_values_for_integral_type (enumtype, precision,
12037 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12039 /* Convert each of the enumerators to the type of the underlying
12040 type of the enumeration. */
12041 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12043 location_t saved_location;
12045 decl = TREE_VALUE (values);
12046 saved_location = input_location;
12047 input_location = DECL_SOURCE_LOCATION (decl);
12048 if (fixed_underlying_type_p)
12049 /* If the enumeration type has a fixed underlying type, we
12050 already checked all of the enumerator values. */
12051 value = DECL_INITIAL (decl);
12053 value = perform_implicit_conversion (underlying_type,
12054 DECL_INITIAL (decl),
12055 tf_warning_or_error);
12056 input_location = saved_location;
12058 /* Do not clobber shared ints. */
12059 value = copy_node (value);
12061 TREE_TYPE (value) = enumtype;
12062 DECL_INITIAL (decl) = value;
12065 /* Fix up all variant types of this enum type. */
12066 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12067 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12069 /* Finish debugging output for this type. */
12070 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12073 /* Finishes the enum type. This is called only the first time an
12074 enumeration is seen, be it opaque or odinary.
12075 ENUMTYPE is the type object. */
12078 finish_enum (tree enumtype)
12080 if (processing_template_decl)
12082 if (at_function_scope_p ())
12083 add_stmt (build_min (TAG_DEFN, enumtype));
12087 /* Here there should not be any variants of this type. */
12088 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12089 && !TYPE_NEXT_VARIANT (enumtype));
12092 /* Build and install a CONST_DECL for an enumeration constant of the
12093 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12094 LOC is the location of NAME.
12095 Assignment of sequential values by default is handled here. */
12098 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12104 /* If the VALUE was erroneous, pretend it wasn't there; that will
12105 result in the enum being assigned the next value in sequence. */
12106 if (value == error_mark_node)
12109 /* Remove no-op casts from the value. */
12111 STRIP_TYPE_NOPS (value);
12113 if (! processing_template_decl)
12115 /* Validate and default VALUE. */
12116 if (value != NULL_TREE)
12118 value = cxx_constant_value (value);
12120 if (TREE_CODE (value) == INTEGER_CST
12121 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12123 value = perform_integral_promotions (value);
12127 error ("enumerator value for %qD is not an integer constant", name);
12132 /* Default based on previous value. */
12133 if (value == NULL_TREE)
12135 if (TYPE_VALUES (enumtype))
12138 unsigned HOST_WIDE_INT lo;
12142 /* The next value is the previous value plus one.
12143 add_double doesn't know the type of the target expression,
12144 so we must check with int_fits_type_p as well. */
12145 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12146 if (error_operand_p (prev_value))
12147 value = error_mark_node;
12150 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12151 TREE_INT_CST_HIGH (prev_value),
12153 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
12155 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
12159 error ("overflow in enumeration values at %qD", name);
12160 value = error_mark_node;
12165 value = integer_zero_node;
12168 /* Remove no-op casts from the value. */
12169 STRIP_TYPE_NOPS (value);
12171 /* If the underlying type of the enum is fixed, check whether
12172 the enumerator values fits in the underlying type. If it
12173 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12174 if (ENUM_UNDERLYING_TYPE (enumtype)
12176 && TREE_CODE (value) == INTEGER_CST
12177 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12179 error ("enumerator value %E is too large for underlying type %<%T%>",
12180 value, ENUM_UNDERLYING_TYPE (enumtype));
12182 /* Silently convert the value so that we can continue. */
12183 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12188 /* C++ associates enums with global, function, or class declarations. */
12189 context = current_scope ();
12191 /* Build the actual enumeration constant. Note that the enumeration
12192 constants have the underlying type of the enum (if it is fixed)
12193 or the type of their initializer (if the underlying type of the
12194 enum is not fixed):
12198 If the underlying type is fixed, the type of each enumerator
12199 prior to the closing brace is the underlying type; if the
12200 initializing value of an enumerator cannot be represented by
12201 the underlying type, the program is ill-formed. If the
12202 underlying type is not fixed, the type of each enumerator is
12203 the type of its initializing value.
12205 If the underlying type is not fixed, it will be computed by
12206 finish_enum and we will reset the type of this enumerator. Of
12207 course, if we're processing a template, there may be no value. */
12208 type = value ? TREE_TYPE (value) : NULL_TREE;
12210 if (context && context == current_class_type)
12211 /* This enum declaration is local to the class. We need the full
12212 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12213 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12215 /* It's a global enum, or it's local to a function. (Note local to
12216 a function could mean local to a class method. */
12217 decl = build_decl (loc, CONST_DECL, name, type);
12219 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12220 TREE_CONSTANT (decl) = 1;
12221 TREE_READONLY (decl) = 1;
12222 DECL_INITIAL (decl) = value;
12224 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12225 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12226 on the TYPE_FIELDS list for `S'. (That's so that you can say
12227 things like `S::i' later.) */
12228 finish_member_declaration (decl);
12232 /* Add this enumeration constant to the list for this type. */
12233 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12236 /* Look for an enumerator with the given NAME within the enumeration
12237 type ENUMTYPE. This routine is used primarily for qualified name
12238 lookup into an enumerator in C++0x, e.g.,
12240 enum class Color { Red, Green, Blue };
12242 Color color = Color::Red;
12244 Returns the value corresponding to the enumerator, or
12245 NULL_TREE if no such enumerator was found. */
12247 lookup_enumerator (tree enumtype, tree name)
12250 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12252 e = purpose_member (name, TYPE_VALUES (enumtype));
12253 return e? TREE_VALUE (e) : NULL_TREE;
12257 /* We're defining DECL. Make sure that its type is OK. */
12260 check_function_type (tree decl, tree current_function_parms)
12262 tree fntype = TREE_TYPE (decl);
12263 tree return_type = complete_type (TREE_TYPE (fntype));
12265 /* In a function definition, arg types must be complete. */
12266 require_complete_types_for_parms (current_function_parms);
12268 if (dependent_type_p (return_type))
12270 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12271 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12273 tree args = TYPE_ARG_TYPES (fntype);
12275 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12276 error ("return type %q#T is incomplete", return_type);
12278 error ("return type has Java class type %q#T", return_type);
12280 /* Make it return void instead. */
12281 if (TREE_CODE (fntype) == METHOD_TYPE)
12282 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12284 TREE_CHAIN (args));
12286 fntype = build_function_type (void_type_node, args);
12288 = build_exception_variant (fntype,
12289 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12290 fntype = (cp_build_type_attribute_variant
12291 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12292 TREE_TYPE (decl) = fntype;
12295 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12298 /* Create the FUNCTION_DECL for a function definition.
12299 DECLSPECS and DECLARATOR are the parts of the declaration;
12300 they describe the function's name and the type it returns,
12301 but twisted together in a fashion that parallels the syntax of C.
12303 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12304 DECLARATOR is really the DECL for the function we are about to
12305 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12306 indicating that the function is an inline defined in-class.
12308 This function creates a binding context for the function body
12309 as well as setting up the FUNCTION_DECL in current_function_decl.
12311 For C++, we must first check whether that datum makes any sense.
12312 For example, "class A local_a(1,2);" means that variable local_a
12313 is an aggregate of type A, which should have a constructor
12314 applied to it with the argument list [1, 2].
12316 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12317 or may be a BLOCK if the function has been defined previously
12318 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12319 error_mark_node if the function has never been defined, or
12320 a BLOCK if the function has been defined somewhere. */
12323 start_preparsed_function (tree decl1, tree attrs, int flags)
12325 tree ctype = NULL_TREE;
12328 int doing_friend = 0;
12329 struct cp_binding_level *bl;
12330 tree current_function_parms;
12331 struct c_fileinfo *finfo
12332 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12333 bool honor_interface;
12335 /* Sanity check. */
12336 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12337 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12339 fntype = TREE_TYPE (decl1);
12340 if (TREE_CODE (fntype) == METHOD_TYPE)
12341 ctype = TYPE_METHOD_BASETYPE (fntype);
12343 /* ISO C++ 11.4/5. A friend function defined in a class is in
12344 the (lexical) scope of the class in which it is defined. */
12345 if (!ctype && DECL_FRIEND_P (decl1))
12347 ctype = DECL_FRIEND_CONTEXT (decl1);
12349 /* CTYPE could be null here if we're dealing with a template;
12350 for example, `inline friend float foo()' inside a template
12351 will have no CTYPE set. */
12352 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12358 if (DECL_DECLARED_INLINE_P (decl1)
12359 && lookup_attribute ("noinline", attrs))
12360 warning (0, "inline function %q+D given attribute noinline", decl1);
12362 /* Handle gnu_inline attribute. */
12363 if (GNU_INLINE_P (decl1))
12365 DECL_EXTERNAL (decl1) = 1;
12366 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12367 DECL_INTERFACE_KNOWN (decl1) = 1;
12368 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12371 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12372 /* This is a constructor, we must ensure that any default args
12373 introduced by this definition are propagated to the clones
12374 now. The clones are used directly in overload resolution. */
12375 adjust_clone_args (decl1);
12377 /* Sometimes we don't notice that a function is a static member, and
12378 build a METHOD_TYPE for it. Fix that up now. */
12379 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12380 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12382 revert_static_member_fn (decl1);
12386 /* Set up current_class_type, and enter the scope of the class, if
12389 push_nested_class (ctype);
12390 else if (DECL_STATIC_FUNCTION_P (decl1))
12391 push_nested_class (DECL_CONTEXT (decl1));
12393 /* Now that we have entered the scope of the class, we must restore
12394 the bindings for any template parameters surrounding DECL1, if it
12395 is an inline member template. (Order is important; consider the
12396 case where a template parameter has the same name as a field of
12397 the class.) It is not until after this point that
12398 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12399 if (flags & SF_INCLASS_INLINE)
12400 maybe_begin_member_template_processing (decl1);
12402 /* Effective C++ rule 15. */
12404 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12405 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12406 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12408 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12409 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12410 if (!DECL_INITIAL (decl1))
12411 DECL_INITIAL (decl1) = error_mark_node;
12413 /* This function exists in static storage.
12414 (This does not mean `static' in the C sense!) */
12415 TREE_STATIC (decl1) = 1;
12417 /* We must call push_template_decl after current_class_type is set
12418 up. (If we are processing inline definitions after exiting a
12419 class scope, current_class_type will be NULL_TREE until set above
12420 by push_nested_class.) */
12421 if (processing_template_decl)
12423 /* FIXME: Handle error_mark_node more gracefully. */
12424 tree newdecl1 = push_template_decl (decl1);
12425 if (newdecl1 != error_mark_node)
12429 /* We are now in the scope of the function being defined. */
12430 current_function_decl = decl1;
12432 /* Save the parm names or decls from this function's declarator
12433 where store_parm_decls will find them. */
12434 current_function_parms = DECL_ARGUMENTS (decl1);
12436 /* Make sure the parameter and return types are reasonable. When
12437 you declare a function, these types can be incomplete, but they
12438 must be complete when you define the function. */
12439 check_function_type (decl1, current_function_parms);
12441 /* Build the return declaration for the function. */
12442 restype = TREE_TYPE (fntype);
12443 if (DECL_RESULT (decl1) == NULL_TREE)
12447 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12448 DECL_ARTIFICIAL (resdecl) = 1;
12449 DECL_IGNORED_P (resdecl) = 1;
12450 DECL_RESULT (decl1) = resdecl;
12452 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12455 /* Let the user know we're compiling this function. */
12456 announce_function (decl1);
12458 /* Record the decl so that the function name is defined.
12459 If we already have a decl for this name, and it is a FUNCTION_DECL,
12460 use the old decl. */
12461 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12463 /* A specialization is not used to guide overload resolution. */
12464 if (!DECL_FUNCTION_MEMBER_P (decl1)
12465 && !(DECL_USE_TEMPLATE (decl1) &&
12466 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12468 tree olddecl = pushdecl (decl1);
12470 if (olddecl == error_mark_node)
12471 /* If something went wrong when registering the declaration,
12472 use DECL1; we have to have a FUNCTION_DECL to use when
12473 parsing the body of the function. */
12477 /* Otherwise, OLDDECL is either a previous declaration
12478 of the same function or DECL1 itself. */
12480 if (warn_missing_declarations
12481 && olddecl == decl1
12482 && !DECL_MAIN_P (decl1)
12483 && TREE_PUBLIC (decl1)
12484 && !DECL_DECLARED_INLINE_P (decl1))
12488 /* Check whether DECL1 is in an anonymous
12490 for (context = DECL_CONTEXT (decl1);
12492 context = DECL_CONTEXT (context))
12494 if (TREE_CODE (context) == NAMESPACE_DECL
12495 && DECL_NAME (context) == NULL_TREE)
12499 if (context == NULL)
12500 warning (OPT_Wmissing_declarations,
12501 "no previous declaration for %q+D", decl1);
12509 /* We need to set the DECL_CONTEXT. */
12510 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12511 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12513 fntype = TREE_TYPE (decl1);
12515 /* If #pragma weak applies, mark the decl appropriately now.
12516 The pragma only applies to global functions. Because
12517 determining whether or not the #pragma applies involves
12518 computing the mangled name for the declaration, we cannot
12519 apply the pragma until after we have merged this declaration
12520 with any previous declarations; if the original declaration
12521 has a linkage specification, that specification applies to
12522 the definition as well, and may affect the mangled name. */
12523 if (DECL_FILE_SCOPE_P (decl1))
12524 maybe_apply_pragma_weak (decl1);
12527 /* constexpr functions must have literal argument types and
12528 literal return type. */
12529 validate_constexpr_fundecl (decl1);
12531 /* Reset this in case the call to pushdecl changed it. */
12532 current_function_decl = decl1;
12534 gcc_assert (DECL_INITIAL (decl1));
12536 /* This function may already have been parsed, in which case just
12537 return; our caller will skip over the body without parsing. */
12538 if (DECL_INITIAL (decl1) != error_mark_node)
12541 /* Initialize RTL machinery. We cannot do this until
12542 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12543 even when processing a template; this is how we get
12544 CFUN set up, and our per-function variables initialized.
12545 FIXME factor out the non-RTL stuff. */
12546 bl = current_binding_level;
12547 allocate_struct_function (decl1, processing_template_decl);
12549 /* Initialize the language data structures. Whenever we start
12550 a new function, we destroy temporaries in the usual way. */
12551 cfun->language = ggc_alloc_cleared_language_function ();
12552 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12553 current_binding_level = bl;
12555 /* Start the statement-tree, start the tree now. */
12556 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12558 /* If we are (erroneously) defining a function that we have already
12559 defined before, wipe out what we knew before. */
12560 if (!DECL_PENDING_INLINE_P (decl1))
12561 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12563 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12565 /* We know that this was set up by `grokclassfn'. We do not
12566 wait until `store_parm_decls', since evil parse errors may
12567 never get us to that point. Here we keep the consistency
12568 between `current_class_type' and `current_class_ptr'. */
12569 tree t = DECL_ARGUMENTS (decl1);
12571 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12572 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12574 cp_function_chain->x_current_class_ref
12575 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12576 cp_function_chain->x_current_class_ptr = t;
12578 /* Constructors and destructors need to know whether they're "in
12579 charge" of initializing virtual base classes. */
12580 t = DECL_CHAIN (t);
12581 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12583 current_in_charge_parm = t;
12584 t = DECL_CHAIN (t);
12586 if (DECL_HAS_VTT_PARM_P (decl1))
12588 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12589 current_vtt_parm = t;
12593 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12594 /* Implicitly-defined methods (like the
12595 destructor for a class in which no destructor
12596 is explicitly declared) must not be defined
12597 until their definition is needed. So, we
12598 ignore interface specifications for
12599 compiler-generated functions. */
12600 && !DECL_ARTIFICIAL (decl1));
12602 if (DECL_INTERFACE_KNOWN (decl1))
12604 tree ctx = decl_function_context (decl1);
12606 if (DECL_NOT_REALLY_EXTERN (decl1))
12607 DECL_EXTERNAL (decl1) = 0;
12609 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12610 && TREE_PUBLIC (ctx))
12611 /* This is a function in a local class in an extern inline
12613 comdat_linkage (decl1);
12615 /* If this function belongs to an interface, it is public.
12616 If it belongs to someone else's interface, it is also external.
12617 This only affects inlines and template instantiations. */
12618 else if (!finfo->interface_unknown && honor_interface)
12620 if (DECL_DECLARED_INLINE_P (decl1)
12621 || DECL_TEMPLATE_INSTANTIATION (decl1)
12622 || processing_template_decl)
12624 DECL_EXTERNAL (decl1)
12625 = (finfo->interface_only
12626 || (DECL_DECLARED_INLINE_P (decl1)
12627 && ! flag_implement_inlines
12628 && !DECL_VINDEX (decl1)));
12630 /* For WIN32 we also want to put these in linkonce sections. */
12631 maybe_make_one_only (decl1);
12634 DECL_EXTERNAL (decl1) = 0;
12635 DECL_INTERFACE_KNOWN (decl1) = 1;
12636 /* If this function is in an interface implemented in this file,
12637 make sure that the back end knows to emit this function
12639 if (!DECL_EXTERNAL (decl1))
12640 mark_needed (decl1);
12642 else if (finfo->interface_unknown && finfo->interface_only
12643 && honor_interface)
12645 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12646 interface, we will have both finfo->interface_unknown and
12647 finfo->interface_only set. In that case, we don't want to
12648 use the normal heuristics because someone will supply a
12649 #pragma implementation elsewhere, and deducing it here would
12650 produce a conflict. */
12651 comdat_linkage (decl1);
12652 DECL_EXTERNAL (decl1) = 0;
12653 DECL_INTERFACE_KNOWN (decl1) = 1;
12654 DECL_DEFER_OUTPUT (decl1) = 1;
12658 /* This is a definition, not a reference.
12659 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12660 if (!GNU_INLINE_P (decl1))
12661 DECL_EXTERNAL (decl1) = 0;
12663 if ((DECL_DECLARED_INLINE_P (decl1)
12664 || DECL_TEMPLATE_INSTANTIATION (decl1))
12665 && ! DECL_INTERFACE_KNOWN (decl1))
12666 DECL_DEFER_OUTPUT (decl1) = 1;
12668 DECL_INTERFACE_KNOWN (decl1) = 1;
12671 /* Determine the ELF visibility attribute for the function. We must not
12672 do this before calling "pushdecl", as we must allow "duplicate_decls"
12673 to merge any attributes appropriately. We also need to wait until
12675 if (!DECL_CLONED_FUNCTION_P (decl1))
12676 determine_visibility (decl1);
12678 begin_scope (sk_function_parms, decl1);
12682 if (DECL_DESTRUCTOR_P (decl1)
12683 || (DECL_CONSTRUCTOR_P (decl1)
12684 && targetm.cxx.cdtor_returns_this ()))
12686 cdtor_label = build_decl (input_location,
12687 LABEL_DECL, NULL_TREE, NULL_TREE);
12688 DECL_CONTEXT (cdtor_label) = current_function_decl;
12691 start_fname_decls ();
12693 store_parm_decls (current_function_parms);
12697 /* Like start_preparsed_function, except that instead of a
12698 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12700 Returns 1 on success. If the DECLARATOR is not suitable for a function
12701 (it defines a datum instead), we return 0, which tells
12702 yyparse to report a parse error. */
12705 start_function (cp_decl_specifier_seq *declspecs,
12706 const cp_declarator *declarator,
12711 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12712 if (decl1 == error_mark_node)
12714 /* If the declarator is not suitable for a function definition,
12715 cause a syntax error. */
12716 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12718 error ("invalid function declaration");
12722 if (DECL_MAIN_P (decl1))
12723 /* main must return int. grokfndecl should have corrected it
12724 (and issued a diagnostic) if the user got it wrong. */
12725 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12726 integer_type_node));
12728 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12733 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12737 use_eh_spec_block (tree fn)
12739 return (flag_exceptions && flag_enforce_eh_specs
12740 && !processing_template_decl
12741 && !type_throw_all_p (TREE_TYPE (fn))
12742 /* We insert the EH_SPEC_BLOCK only in the original
12743 function; then, it is copied automatically to the
12745 && !DECL_CLONED_FUNCTION_P (fn)
12746 /* Implicitly-generated constructors and destructors have
12747 exception specifications. However, those specifications
12748 are the union of the possible exceptions specified by the
12749 constructors/destructors for bases and members, so no
12750 unallowed exception will ever reach this function. By
12751 not creating the EH_SPEC_BLOCK we save a little memory,
12752 and we avoid spurious warnings about unreachable
12754 && !DECL_ARTIFICIAL (fn));
12757 /* Store the parameter declarations into the current function declaration.
12758 This is called after parsing the parameter declarations, before
12759 digesting the body of the function.
12761 Also install to binding contour return value identifier, if any. */
12764 store_parm_decls (tree current_function_parms)
12766 tree fndecl = current_function_decl;
12769 /* This is a chain of any other decls that came in among the parm
12770 declarations. If a parm is declared with enum {foo, bar} x;
12771 then CONST_DECLs for foo and bar are put here. */
12772 tree nonparms = NULL_TREE;
12774 if (current_function_parms)
12776 /* This case is when the function was defined with an ANSI prototype.
12777 The parms already have decls, so we need not do anything here
12778 except record them as in effect
12779 and complain if any redundant old-style parm decls were written. */
12781 tree specparms = current_function_parms;
12784 /* Must clear this because it might contain TYPE_DECLs declared
12786 current_binding_level->names = NULL;
12788 /* If we're doing semantic analysis, then we'll call pushdecl
12789 for each of these. We must do them in reverse order so that
12790 they end in the correct forward order. */
12791 specparms = nreverse (specparms);
12793 for (parm = specparms; parm; parm = next)
12795 next = DECL_CHAIN (parm);
12796 if (TREE_CODE (parm) == PARM_DECL)
12798 if (DECL_NAME (parm) == NULL_TREE
12799 || TREE_CODE (parm) != VOID_TYPE)
12802 error ("parameter %qD declared void", parm);
12806 /* If we find an enum constant or a type tag,
12807 put it aside for the moment. */
12808 TREE_CHAIN (parm) = NULL_TREE;
12809 nonparms = chainon (nonparms, parm);
12813 /* Get the decls in their original chain order and record in the
12814 function. This is all and only the PARM_DECLs that were
12815 pushed into scope by the loop above. */
12816 DECL_ARGUMENTS (fndecl) = getdecls ();
12819 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12821 /* Now store the final chain of decls for the arguments
12822 as the decl-chain of the current lexical scope.
12823 Put the enumerators in as well, at the front so that
12824 DECL_ARGUMENTS is not modified. */
12825 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12827 if (use_eh_spec_block (current_function_decl))
12828 current_eh_spec_block = begin_eh_spec_block ();
12832 /* We have finished doing semantic analysis on DECL, but have not yet
12833 generated RTL for its body. Save away our current state, so that
12834 when we want to generate RTL later we know what to do. */
12837 save_function_data (tree decl)
12839 struct language_function *f;
12841 /* Save the language-specific per-function data so that we can
12842 get it back when we really expand this function. */
12843 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12846 f = ggc_alloc_language_function ();
12847 memcpy (f, cp_function_chain, sizeof (struct language_function));
12848 DECL_SAVED_FUNCTION_DATA (decl) = f;
12850 /* Clear out the bits we don't need. */
12851 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12852 f->bindings = NULL;
12853 f->x_local_names = NULL;
12857 /* Set the return value of the constructor (if present). */
12860 finish_constructor_body (void)
12865 if (targetm.cxx.cdtor_returns_this ()
12866 && (! TYPE_FOR_JAVA (current_class_type)))
12868 /* Any return from a constructor will end up here. */
12869 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12871 val = DECL_ARGUMENTS (current_function_decl);
12872 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12873 DECL_RESULT (current_function_decl), val);
12874 /* Return the address of the object. */
12875 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12876 add_stmt (exprstmt);
12880 /* Do all the processing for the beginning of a destructor; set up the
12881 vtable pointers and cleanups for bases and members. */
12884 begin_destructor_body (void)
12886 tree compound_stmt;
12888 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12889 issued an error message. We still want to try to process the
12890 body of the function, but initialize_vtbl_ptrs will crash if
12891 TYPE_BINFO is NULL. */
12892 if (COMPLETE_TYPE_P (current_class_type))
12894 compound_stmt = begin_compound_stmt (0);
12895 /* Make all virtual function table pointers in non-virtual base
12896 classes point to CURRENT_CLASS_TYPE's virtual function
12898 initialize_vtbl_ptrs (current_class_ptr);
12899 finish_compound_stmt (compound_stmt);
12901 /* And insert cleanups for our bases and members so that they
12902 will be properly destroyed if we throw. */
12903 push_base_cleanups ();
12907 /* At the end of every destructor we generate code to delete the object if
12908 necessary. Do that now. */
12911 finish_destructor_body (void)
12915 /* Any return from a destructor will end up here; that way all base
12916 and member cleanups will be run when the function returns. */
12917 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12919 /* In a virtual destructor, we must call delete. */
12920 if (DECL_VIRTUAL_P (current_function_decl))
12923 tree virtual_size = cxx_sizeof (current_class_type);
12927 At the point of definition of a virtual destructor (including
12928 an implicit definition), non-placement operator delete shall
12929 be looked up in the scope of the destructor's class and if
12930 found shall be accessible and unambiguous. */
12931 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12933 /*global_p=*/false,
12934 /*placement=*/NULL_TREE,
12935 /*alloc_fn=*/NULL_TREE);
12937 if_stmt = begin_if_stmt ();
12938 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12939 current_in_charge_parm,
12942 finish_expr_stmt (exprstmt);
12943 finish_then_clause (if_stmt);
12944 finish_if_stmt (if_stmt);
12947 if (targetm.cxx.cdtor_returns_this ())
12951 val = DECL_ARGUMENTS (current_function_decl);
12952 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12953 DECL_RESULT (current_function_decl), val);
12954 /* Return the address of the object. */
12955 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12956 add_stmt (exprstmt);
12960 /* Do the necessary processing for the beginning of a function body, which
12961 in this case includes member-initializers, but not the catch clauses of
12962 a function-try-block. Currently, this means opening a binding level
12963 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12966 begin_function_body (void)
12970 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12973 if (processing_template_decl)
12974 /* Do nothing now. */;
12976 /* Always keep the BLOCK node associated with the outermost pair of
12977 curly braces of a function. These are needed for correct
12978 operation of dwarfout.c. */
12979 keep_next_level (true);
12981 stmt = begin_compound_stmt (BCS_FN_BODY);
12983 if (processing_template_decl)
12984 /* Do nothing now. */;
12985 else if (DECL_DESTRUCTOR_P (current_function_decl))
12986 begin_destructor_body ();
12991 /* Do the processing for the end of a function body. Currently, this means
12992 closing out the cleanups for fully-constructed bases and members, and in
12993 the case of the destructor, deleting the object if desired. Again, this
12994 is only meaningful for [cd]tors, since they are the only functions where
12995 there is a significant distinction between the main body and any
12996 function catch clauses. Handling, say, main() return semantics here
12997 would be wrong, as flowing off the end of a function catch clause for
12998 main() would also need to return 0. */
13001 finish_function_body (tree compstmt)
13003 if (compstmt == NULL_TREE)
13006 /* Close the block. */
13007 finish_compound_stmt (compstmt);
13009 if (processing_template_decl)
13010 /* Do nothing now. */;
13011 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13012 finish_constructor_body ();
13013 else if (DECL_DESTRUCTOR_P (current_function_decl))
13014 finish_destructor_body ();
13017 /* Given a function, returns the BLOCK corresponding to the outermost level
13018 of curly braces, skipping the artificial block created for constructor
13022 outer_curly_brace_block (tree fndecl)
13024 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13025 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13026 /* Skip the artificial function body block. */
13027 block = BLOCK_SUBBLOCKS (block);
13031 /* If FNDECL is a class's key method, add the class to the list of
13032 keyed classes that should be emitted. */
13035 record_key_method_defined (tree fndecl)
13037 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13038 && DECL_VIRTUAL_P (fndecl)
13039 && !processing_template_decl)
13041 tree fnclass = DECL_CONTEXT (fndecl);
13042 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13043 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13047 /* Subroutine of finish_function.
13048 Save the body of constexpr functions for possible
13049 future compile time evaluation. */
13052 maybe_save_function_definition (tree fun)
13054 if (!processing_template_decl
13055 && DECL_DECLARED_CONSTEXPR_P (fun)
13056 && !DECL_CLONED_FUNCTION_P (fun))
13057 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13060 /* Finish up a function declaration and compile that function
13061 all the way to assembler language output. The free the storage
13062 for the function definition.
13064 FLAGS is a bitwise or of the following values:
13066 We just finished processing the body of an in-class inline
13067 function definition. (This processing will have taken place
13068 after the class definition is complete.) */
13071 finish_function (int flags)
13073 tree fndecl = current_function_decl;
13074 tree fntype, ctype = NULL_TREE;
13075 int inclass_inline = (flags & 2) != 0;
13077 /* When we get some parse errors, we can end up without a
13078 current_function_decl, so cope. */
13079 if (fndecl == NULL_TREE)
13080 return error_mark_node;
13082 if (c_dialect_objc ())
13083 objc_finish_function ();
13085 gcc_assert (!defer_mark_used_calls);
13086 defer_mark_used_calls = true;
13088 record_key_method_defined (fndecl);
13090 fntype = TREE_TYPE (fndecl);
13092 /* TREE_READONLY (fndecl) = 1;
13093 This caused &foo to be of type ptr-to-const-function
13094 which then got a warning when stored in a ptr-to-function variable. */
13096 gcc_assert (building_stmt_tree ());
13097 /* The current function is being defined, so its DECL_INITIAL should
13098 be set, and unless there's a multiple definition, it should be
13099 error_mark_node. */
13100 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13102 /* For a cloned function, we've already got all the code we need;
13103 there's no need to add any extra bits. */
13104 if (!DECL_CLONED_FUNCTION_P (fndecl))
13106 if (DECL_MAIN_P (current_function_decl))
13110 /* Make it so that `main' always returns 0 by default (or
13113 stmt = finish_return_stmt (integer_one_node);
13115 stmt = finish_return_stmt (integer_zero_node);
13117 /* Hack. We don't want the middle-end to warn that this
13118 return is unreachable, so put the statement on the
13121 location_t linezero = linemap_line_start (line_table, 0, 1);
13122 SET_EXPR_LOCATION (stmt, linezero);
13126 if (use_eh_spec_block (current_function_decl))
13127 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13128 (TREE_TYPE (current_function_decl)),
13129 current_eh_spec_block);
13132 /* If we're saving up tree structure, tie off the function now. */
13133 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13135 finish_fname_decls ();
13137 /* If this function can't throw any exceptions, remember that. */
13138 if (!processing_template_decl
13139 && !cp_function_chain->can_throw
13140 && !flag_non_call_exceptions
13141 && !decl_replaceable_p (fndecl))
13142 TREE_NOTHROW (fndecl) = 1;
13144 /* This must come after expand_function_end because cleanups might
13145 have declarations (from inline functions) that need to go into
13146 this function's blocks. */
13148 /* If the current binding level isn't the outermost binding level
13149 for this function, either there is a bug, or we have experienced
13150 syntax errors and the statement tree is malformed. */
13151 if (current_binding_level->kind != sk_function_parms)
13153 /* Make sure we have already experienced errors. */
13154 gcc_assert (errorcount);
13156 /* Throw away the broken statement tree and extra binding
13158 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13160 while (current_binding_level->kind != sk_function_parms)
13162 if (current_binding_level->kind == sk_class)
13163 pop_nested_class ();
13165 poplevel (0, 0, 0);
13168 poplevel (1, 0, 1);
13170 /* Statements should always be full-expressions at the outermost set
13171 of curly braces for a function. */
13172 gcc_assert (stmts_are_full_exprs_p ());
13174 /* Save constexpr function body before it gets munged by
13175 the NRV transformation. */
13176 maybe_save_function_definition (fndecl);
13178 /* Set up the named return value optimization, if we can. Candidate
13179 variables are selected in check_return_expr. */
13180 if (current_function_return_value)
13182 tree r = current_function_return_value;
13185 if (r != error_mark_node
13186 /* This is only worth doing for fns that return in memory--and
13187 simpler, since we don't have to worry about promoted modes. */
13188 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13189 /* Only allow this for variables declared in the outer scope of
13190 the function so we know that their lifetime always ends with a
13191 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13192 we were to do this optimization in tree-ssa. */
13193 && (outer = outer_curly_brace_block (fndecl))
13194 && chain_member (r, BLOCK_VARS (outer)))
13195 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13197 current_function_return_value = NULL_TREE;
13200 /* Remember that we were in class scope. */
13201 if (current_class_name)
13202 ctype = current_class_type;
13204 /* Must mark the RESULT_DECL as being in this function. */
13205 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13207 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13208 to the FUNCTION_DECL node itself. */
13209 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13211 /* Save away current state, if appropriate. */
13212 if (!processing_template_decl)
13213 save_function_data (fndecl);
13215 /* Complain if there's just no return statement. */
13216 if (warn_return_type
13217 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13218 && !dependent_type_p (TREE_TYPE (fntype))
13219 && !current_function_returns_value && !current_function_returns_null
13220 /* Don't complain if we abort or throw. */
13221 && !current_function_returns_abnormally
13222 /* Don't complain if we are declared noreturn. */
13223 && !TREE_THIS_VOLATILE (fndecl)
13224 && !DECL_NAME (DECL_RESULT (fndecl))
13225 && !TREE_NO_WARNING (fndecl)
13226 /* Structor return values (if any) are set by the compiler. */
13227 && !DECL_CONSTRUCTOR_P (fndecl)
13228 && !DECL_DESTRUCTOR_P (fndecl))
13230 warning (OPT_Wreturn_type,
13231 "no return statement in function returning non-void");
13232 TREE_NO_WARNING (fndecl) = 1;
13235 /* Store the end of the function, so that we get good line number
13236 info for the epilogue. */
13237 cfun->function_end_locus = input_location;
13239 /* Complain about parameters that are only set, but never otherwise used. */
13240 if (warn_unused_but_set_parameter
13241 && !processing_template_decl
13242 && errorcount == unused_but_set_errorcount
13243 && !DECL_CLONED_FUNCTION_P (fndecl))
13247 for (decl = DECL_ARGUMENTS (fndecl);
13249 decl = DECL_CHAIN (decl))
13250 if (TREE_USED (decl)
13251 && TREE_CODE (decl) == PARM_DECL
13252 && !DECL_READ_P (decl)
13253 && DECL_NAME (decl)
13254 && !DECL_ARTIFICIAL (decl)
13255 && !TREE_NO_WARNING (decl)
13256 && !DECL_IN_SYSTEM_HEADER (decl)
13257 && TREE_TYPE (decl) != error_mark_node
13258 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13259 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13260 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13261 warning (OPT_Wunused_but_set_parameter,
13262 "parameter %q+D set but not used", decl);
13263 unused_but_set_errorcount = errorcount;
13266 /* Genericize before inlining. */
13267 if (!processing_template_decl)
13269 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13270 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13271 cp_genericize (fndecl);
13272 /* Clear out the bits we don't need. */
13273 f->x_current_class_ptr = NULL;
13274 f->x_current_class_ref = NULL;
13275 f->x_eh_spec_block = NULL;
13276 f->x_in_charge_parm = NULL;
13277 f->x_vtt_parm = NULL;
13278 f->x_return_value = NULL;
13279 f->bindings = NULL;
13280 f->extern_decl_map = NULL;
13282 /* Clear out the bits we don't need. */
13283 local_names = NULL;
13285 /* We're leaving the context of this function, so zap cfun. It's still in
13286 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13288 current_function_decl = NULL;
13290 /* If this is an in-class inline definition, we may have to pop the
13291 bindings for the template parameters that we added in
13292 maybe_begin_member_template_processing when start_function was
13294 if (inclass_inline)
13295 maybe_end_member_template_processing ();
13297 /* Leave the scope of the class. */
13299 pop_nested_class ();
13304 current_function_decl = NULL_TREE;
13306 defer_mark_used_calls = false;
13307 if (deferred_mark_used_calls)
13312 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13314 VEC_free (tree, gc, deferred_mark_used_calls);
13320 /* Create the FUNCTION_DECL for a function definition.
13321 DECLSPECS and DECLARATOR are the parts of the declaration;
13322 they describe the return type and the name of the function,
13323 but twisted together in a fashion that parallels the syntax of C.
13325 This function creates a binding context for the function body
13326 as well as setting up the FUNCTION_DECL in current_function_decl.
13328 Returns a FUNCTION_DECL on success.
13330 If the DECLARATOR is not suitable for a function (it defines a datum
13331 instead), we return 0, which tells yyparse to report a parse error.
13333 May return void_type_node indicating that this method is actually
13334 a friend. See grokfield for more details.
13336 Came here with a `.pushlevel' .
13338 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13339 CHANGES TO CODE IN `grokfield'. */
13342 grokmethod (cp_decl_specifier_seq *declspecs,
13343 const cp_declarator *declarator, tree attrlist)
13345 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13348 if (fndecl == error_mark_node)
13349 return error_mark_node;
13351 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13353 error ("invalid member function declaration");
13354 return error_mark_node;
13358 cplus_decl_attributes (&fndecl, attrlist, 0);
13360 /* Pass friends other than inline friend functions back. */
13361 if (fndecl == void_type_node)
13364 if (DECL_IN_AGGR_P (fndecl))
13366 if (DECL_CLASS_SCOPE_P (fndecl))
13367 error ("%qD is already defined in class %qT", fndecl,
13368 DECL_CONTEXT (fndecl));
13369 return error_mark_node;
13372 check_template_shadow (fndecl);
13374 DECL_DECLARED_INLINE_P (fndecl) = 1;
13375 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13377 /* We process method specializations in finish_struct_1. */
13378 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13380 fndecl = push_template_decl (fndecl);
13381 if (fndecl == error_mark_node)
13385 if (! DECL_FRIEND_P (fndecl))
13387 if (DECL_CHAIN (fndecl))
13389 fndecl = copy_node (fndecl);
13390 TREE_CHAIN (fndecl) = NULL_TREE;
13394 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13396 DECL_IN_AGGR_P (fndecl) = 1;
13401 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13402 we can lay it out later, when and if its type becomes complete. */
13405 maybe_register_incomplete_var (tree var)
13407 gcc_assert (TREE_CODE (var) == VAR_DECL);
13409 /* Keep track of variables with incomplete types. */
13410 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13411 && DECL_EXTERNAL (var))
13413 tree inner_type = TREE_TYPE (var);
13415 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13416 inner_type = TREE_TYPE (inner_type);
13417 inner_type = TYPE_MAIN_VARIANT (inner_type);
13419 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13420 /* RTTI TD entries are created while defining the type_info. */
13421 || (TYPE_LANG_SPECIFIC (inner_type)
13422 && TYPE_BEING_DEFINED (inner_type)))
13425 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13427 iv->incomplete_type = inner_type;
13432 /* Called when a class type (given by TYPE) is defined. If there are
13433 any existing VAR_DECLs whose type has been completed by this
13434 declaration, update them now. */
13437 complete_vars (tree type)
13440 incomplete_var *iv;
13442 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13444 if (same_type_p (type, iv->incomplete_type))
13446 tree var = iv->decl;
13447 tree type = TREE_TYPE (var);
13448 /* Complete the type of the variable. The VAR_DECL itself
13449 will be laid out in expand_expr. */
13450 complete_type (type);
13451 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13452 /* Remove this entry from the list. */
13453 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13459 /* Check for pending declarations which may have abstract type. */
13460 complete_type_check_abstract (type);
13463 /* If DECL is of a type which needs a cleanup, build and return an
13464 expression to perform that cleanup here. Return NULL_TREE if no
13465 cleanup need be done. */
13468 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13474 /* Assume no cleanup is required. */
13475 cleanup = NULL_TREE;
13477 if (error_operand_p (decl))
13480 /* Handle "__attribute__((cleanup))". We run the cleanup function
13481 before the destructor since the destructor is what actually
13482 terminates the lifetime of the object. */
13483 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13490 /* Get the name specified by the user for the cleanup function. */
13491 id = TREE_VALUE (TREE_VALUE (attr));
13492 /* Look up the name to find the cleanup function to call. It is
13493 important to use lookup_name here because that is what is
13494 used in c-common.c:handle_cleanup_attribute when performing
13495 initial checks on the attribute. Note that those checks
13496 include ensuring that the function found is not an overloaded
13497 function, or an object with an overloaded call operator,
13498 etc.; we can rely on the fact that the function found is an
13499 ordinary FUNCTION_DECL. */
13500 fn = lookup_name (id);
13501 arg = build_address (decl);
13503 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13504 if (cleanup == error_mark_node)
13505 return error_mark_node;
13507 /* Handle ordinary C++ destructors. */
13508 type = TREE_TYPE (decl);
13509 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13511 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13512 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13513 && CLASSTYPE_VBASECLASSES (type));
13517 if (TREE_CODE (type) == ARRAY_TYPE)
13520 addr = build_address (decl);
13522 /* Optimize for space over speed here. */
13523 if (!has_vbases || flag_expensive_optimizations)
13524 flags |= LOOKUP_NONVIRTUAL;
13526 call = build_delete (TREE_TYPE (addr), addr,
13527 sfk_complete_destructor, flags, 0, complain);
13528 if (call == error_mark_node)
13529 cleanup = error_mark_node;
13531 cleanup = cp_build_compound_expr (cleanup, call, complain);
13539 /* When a stmt has been parsed, this function is called. */
13546 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13547 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13548 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13551 static_fn_type (tree memfntype)
13556 if (TYPE_PTRMEMFUNC_P (memfntype))
13557 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13558 if (POINTER_TYPE_P (memfntype)
13559 || TREE_CODE (memfntype) == FUNCTION_DECL)
13560 memfntype = TREE_TYPE (memfntype);
13561 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13563 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13564 args = TYPE_ARG_TYPES (memfntype);
13565 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13566 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13567 fntype = (cp_build_type_attribute_variant
13568 (fntype, TYPE_ATTRIBUTES (memfntype)));
13569 fntype = (build_exception_variant
13570 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13574 /* DECL was originally constructed as a non-static member function,
13575 but turned out to be static. Update it accordingly. */
13578 revert_static_member_fn (tree decl)
13580 tree stype = static_fn_type (decl);
13582 if (type_memfn_quals (stype) != TYPE_UNQUALIFIED)
13584 error ("static member function %q#D declared with type qualifiers", decl);
13585 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13587 TREE_TYPE (decl) = stype;
13589 if (DECL_ARGUMENTS (decl))
13590 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13591 DECL_STATIC_FUNCTION_P (decl) = 1;
13594 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13595 one of the language-independent trees. */
13597 enum cp_tree_node_structure_enum
13598 cp_tree_node_structure (union lang_tree_node * t)
13600 switch (TREE_CODE (&t->generic))
13602 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13603 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13604 case OVERLOAD: return TS_CP_OVERLOAD;
13605 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13606 case PTRMEM_CST: return TS_CP_PTRMEM;
13607 case BASELINK: return TS_CP_BASELINK;
13608 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13609 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13610 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13611 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13612 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13613 default: return TS_CP_GENERIC;
13617 /* Build the void_list_node (void_type_node having been created). */
13619 build_void_list_node (void)
13621 tree t = build_tree_list (NULL_TREE, void_type_node);
13626 cp_missing_noreturn_ok_p (tree decl)
13628 /* A missing noreturn is ok for the `main' function. */
13629 return DECL_MAIN_P (decl);
13632 /* Return the COMDAT group into which DECL should be placed. */
13635 cxx_comdat_group (tree decl)
13639 /* Virtual tables, construction virtual tables, and virtual table
13640 tables all go in a single COMDAT group, named after the primary
13642 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13643 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13644 /* For all other DECLs, the COMDAT group is the mangled name of the
13645 declaration itself. */
13648 while (DECL_THUNK_P (decl))
13650 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13651 into the same section as the target function. In that case
13652 we must return target's name. */
13653 tree target = THUNK_TARGET (decl);
13654 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13655 && DECL_SECTION_NAME (target) != NULL
13656 && DECL_ONE_ONLY (target))
13661 name = DECL_ASSEMBLER_NAME (decl);
13667 #include "gt-cp-decl.h"