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);
1691 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1694 /* Deal with C++: must preserve virtual function table size. */
1695 if (TREE_CODE (olddecl) == TYPE_DECL)
1697 tree newtype = TREE_TYPE (newdecl);
1698 tree oldtype = TREE_TYPE (olddecl);
1700 if (newtype != error_mark_node && oldtype != error_mark_node
1701 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1702 CLASSTYPE_FRIEND_CLASSES (newtype)
1703 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1705 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1708 /* Copy all the DECL_... slots specified in the new decl
1709 except for any that we copy here from the old type. */
1710 DECL_ATTRIBUTES (newdecl)
1711 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1713 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1717 old_result = DECL_TEMPLATE_RESULT (olddecl);
1718 new_result = DECL_TEMPLATE_RESULT (newdecl);
1719 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1720 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1721 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1722 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1724 DECL_ATTRIBUTES (old_result)
1725 = (*targetm.merge_decl_attributes) (old_result, new_result);
1727 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1729 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1730 && DECL_INITIAL (new_result))
1732 if (DECL_INITIAL (old_result))
1733 DECL_UNINLINABLE (old_result) = 1;
1735 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1736 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1737 DECL_NOT_REALLY_EXTERN (old_result)
1738 = DECL_NOT_REALLY_EXTERN (new_result);
1739 DECL_INTERFACE_KNOWN (old_result)
1740 = DECL_INTERFACE_KNOWN (new_result);
1741 DECL_DECLARED_INLINE_P (old_result)
1742 = DECL_DECLARED_INLINE_P (new_result);
1743 DECL_DISREGARD_INLINE_LIMITS (old_result)
1744 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1749 DECL_DECLARED_INLINE_P (old_result)
1750 |= DECL_DECLARED_INLINE_P (new_result);
1751 DECL_DISREGARD_INLINE_LIMITS (old_result)
1752 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1753 check_redeclaration_exception_specification (newdecl, olddecl);
1757 /* If the new declaration is a definition, update the file and
1758 line information on the declaration, and also make
1759 the old declaration the same definition. */
1760 if (DECL_INITIAL (new_result) != NULL_TREE)
1762 DECL_SOURCE_LOCATION (olddecl)
1763 = DECL_SOURCE_LOCATION (old_result)
1764 = DECL_SOURCE_LOCATION (newdecl);
1765 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1766 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1769 DECL_ARGUMENTS (old_result)
1770 = DECL_ARGUMENTS (new_result);
1771 for (parm = DECL_ARGUMENTS (old_result); parm;
1772 parm = DECL_CHAIN (parm))
1773 DECL_CONTEXT (parm) = old_result;
1782 /* Automatically handles default parameters. */
1783 tree oldtype = TREE_TYPE (olddecl);
1786 /* Merge the data types specified in the two decls. */
1787 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1789 /* If merge_types produces a non-typedef type, just use the old type. */
1790 if (TREE_CODE (newdecl) == TYPE_DECL
1791 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1794 if (TREE_CODE (newdecl) == VAR_DECL)
1796 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1797 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1798 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1799 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1800 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1801 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1803 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1804 if (DECL_LANG_SPECIFIC (olddecl)
1805 && CP_DECL_THREADPRIVATE_P (olddecl))
1807 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1808 if (!DECL_LANG_SPECIFIC (newdecl))
1809 retrofit_lang_decl (newdecl);
1811 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1812 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1816 /* Do this after calling `merge_types' so that default
1817 parameters don't confuse us. */
1818 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1819 check_redeclaration_exception_specification (newdecl, olddecl);
1820 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1822 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1823 check_default_args (newdecl);
1825 /* Lay the type out, unless already done. */
1826 if (! same_type_p (newtype, oldtype)
1827 && TREE_TYPE (newdecl) != error_mark_node
1828 && !(processing_template_decl && uses_template_parms (newdecl)))
1829 layout_type (TREE_TYPE (newdecl));
1831 if ((TREE_CODE (newdecl) == VAR_DECL
1832 || TREE_CODE (newdecl) == PARM_DECL
1833 || TREE_CODE (newdecl) == RESULT_DECL
1834 || TREE_CODE (newdecl) == FIELD_DECL
1835 || TREE_CODE (newdecl) == TYPE_DECL)
1836 && !(processing_template_decl && uses_template_parms (newdecl)))
1837 layout_decl (newdecl, 0);
1839 /* Merge the type qualifiers. */
1840 if (TREE_READONLY (newdecl))
1841 TREE_READONLY (olddecl) = 1;
1842 if (TREE_THIS_VOLATILE (newdecl))
1843 TREE_THIS_VOLATILE (olddecl) = 1;
1844 if (TREE_NOTHROW (newdecl))
1845 TREE_NOTHROW (olddecl) = 1;
1847 /* Merge deprecatedness. */
1848 if (TREE_DEPRECATED (newdecl))
1849 TREE_DEPRECATED (olddecl) = 1;
1851 /* Preserve function specific target and optimization options */
1852 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1854 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1855 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1856 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1857 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1859 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1860 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1861 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1862 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1865 /* Merge the initialization information. */
1866 if (DECL_INITIAL (newdecl) == NULL_TREE
1867 && DECL_INITIAL (olddecl) != NULL_TREE)
1869 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1870 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1871 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1873 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1874 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1878 /* Merge the section attribute.
1879 We want to issue an error if the sections conflict but that must be
1880 done later in decl_attributes since we are called before attributes
1882 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1883 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1885 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1887 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1888 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1889 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1890 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1891 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1892 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1893 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1894 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1895 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1896 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1897 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1898 /* Keep the old RTL. */
1899 COPY_DECL_RTL (olddecl, newdecl);
1901 else if (TREE_CODE (newdecl) == VAR_DECL
1902 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1904 /* Keep the old RTL. We cannot keep the old RTL if the old
1905 declaration was for an incomplete object and the new
1906 declaration is not since many attributes of the RTL will
1908 COPY_DECL_RTL (olddecl, newdecl);
1911 /* If cannot merge, then use the new type and qualifiers,
1912 and don't preserve the old rtl. */
1915 /* Clean out any memory we had of the old declaration. */
1916 tree oldstatic = value_member (olddecl, static_aggregates);
1918 TREE_VALUE (oldstatic) = error_mark_node;
1920 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1921 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1922 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1923 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1926 /* Merge the storage class information. */
1927 merge_weak (newdecl, olddecl);
1929 if (DECL_ONE_ONLY (olddecl))
1930 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1932 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1933 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1934 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1935 if (! DECL_EXTERNAL (olddecl))
1936 DECL_EXTERNAL (newdecl) = 0;
1938 new_template_info = NULL_TREE;
1939 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1941 bool new_redefines_gnu_inline = false;
1943 if (new_defines_function
1944 && ((DECL_INTERFACE_KNOWN (olddecl)
1945 && TREE_CODE (olddecl) == FUNCTION_DECL)
1946 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1947 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1948 == FUNCTION_DECL))))
1952 if (TREE_CODE (fn) == TEMPLATE_DECL)
1953 fn = DECL_TEMPLATE_RESULT (olddecl);
1955 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1958 if (!new_redefines_gnu_inline)
1960 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1961 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1962 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1964 DECL_TEMPLATE_INSTANTIATED (newdecl)
1965 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1966 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1968 /* If the OLDDECL is an instantiation and/or specialization,
1969 then the NEWDECL must be too. But, it may not yet be marked
1970 as such if the caller has created NEWDECL, but has not yet
1971 figured out that it is a redeclaration. */
1972 if (!DECL_USE_TEMPLATE (newdecl))
1973 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1975 /* Don't really know how much of the language-specific
1976 values we should copy from old to new. */
1977 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1978 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1979 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1980 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1982 if (LANG_DECL_HAS_MIN (newdecl))
1984 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1985 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1986 if (DECL_TEMPLATE_INFO (newdecl))
1987 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1988 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1990 /* Only functions have these fields. */
1991 if (TREE_CODE (newdecl) == FUNCTION_DECL
1992 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1994 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1995 olddecl_friend = DECL_FRIEND_P (olddecl);
1996 hidden_friend = (DECL_ANTICIPATED (olddecl)
1997 && DECL_HIDDEN_FRIEND_P (olddecl)
1998 && newdecl_is_friend);
1999 DECL_BEFRIENDING_CLASSES (newdecl)
2000 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2001 DECL_BEFRIENDING_CLASSES (olddecl));
2002 /* DECL_THUNKS is only valid for virtual functions,
2003 otherwise it is a DECL_FRIEND_CONTEXT. */
2004 if (DECL_VIRTUAL_P (newdecl))
2005 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2007 /* Only variables have this field. */
2008 else if (TREE_CODE (newdecl) == VAR_DECL
2009 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2010 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2013 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2017 /* Merge parameter attributes. */
2018 tree oldarg, newarg;
2019 for (oldarg = DECL_ARGUMENTS(olddecl),
2020 newarg = DECL_ARGUMENTS(newdecl);
2022 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2023 DECL_ATTRIBUTES (newarg)
2024 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2025 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2028 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2029 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2031 /* If newdecl is not a specialization, then it is not a
2032 template-related function at all. And that means that we
2033 should have exited above, returning 0. */
2034 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2036 if (DECL_ODR_USED (olddecl))
2037 /* From [temp.expl.spec]:
2039 If a template, a member template or the member of a class
2040 template is explicitly specialized then that
2041 specialization shall be declared before the first use of
2042 that specialization that would cause an implicit
2043 instantiation to take place, in every translation unit in
2044 which such a use occurs. */
2045 error ("explicit specialization of %qD after first use",
2048 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2050 /* Don't propagate visibility from the template to the
2051 specialization here. We'll do that in determine_visibility if
2053 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2055 /* [temp.expl.spec/14] We don't inline explicit specialization
2056 just because the primary template says so. */
2058 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2059 the always_inline attribute. */
2060 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2061 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2063 if (DECL_DECLARED_INLINE_P (newdecl))
2064 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2066 DECL_ATTRIBUTES (newdecl)
2067 = remove_attribute ("always_inline",
2068 DECL_ATTRIBUTES (newdecl));
2071 else if (new_defines_function && DECL_INITIAL (olddecl))
2073 /* Never inline re-defined extern inline functions.
2074 FIXME: this could be better handled by keeping both
2075 function as separate declarations. */
2076 DECL_UNINLINABLE (newdecl) = 1;
2080 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2081 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2083 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2085 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2086 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2088 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2089 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2090 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2091 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2094 /* Preserve abstractness on cloned [cd]tors. */
2095 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2097 /* Update newdecl's parms to point at olddecl. */
2098 for (parm = DECL_ARGUMENTS (newdecl); parm;
2099 parm = DECL_CHAIN (parm))
2100 DECL_CONTEXT (parm) = olddecl;
2104 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2105 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2106 COPY_DECL_RTL (newdecl, olddecl);
2108 if (! types_match || new_defines_function)
2110 /* These need to be copied so that the names are available.
2111 Note that if the types do match, we'll preserve inline
2112 info and other bits, but if not, we won't. */
2113 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2114 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2116 if (new_defines_function)
2117 /* If defining a function declared with other language
2118 linkage, use the previously declared language linkage. */
2119 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2120 else if (types_match)
2122 /* If redeclaring a builtin function, and not a definition,
2123 it stays built in. */
2124 if (DECL_BUILT_IN (olddecl))
2126 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2127 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2128 /* If we're keeping the built-in definition, keep the rtl,
2129 regardless of declaration matches. */
2130 COPY_DECL_RTL (olddecl, newdecl);
2133 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2134 /* Don't clear out the arguments if we're just redeclaring a
2136 if (DECL_ARGUMENTS (olddecl))
2137 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2140 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2141 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2143 /* Now preserve various other info from the definition. */
2144 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2145 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2146 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2147 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2149 /* Warn about conflicting visibility specifications. */
2150 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2151 && DECL_VISIBILITY_SPECIFIED (newdecl)
2152 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2154 warning_at (input_location, OPT_Wattributes,
2155 "%q+D: visibility attribute ignored because it", newdecl);
2156 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2157 "conflicts with previous declaration here");
2159 /* Choose the declaration which specified visibility. */
2160 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2162 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2163 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2165 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2166 so keep this behavior. */
2167 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2169 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2170 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2172 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2173 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2174 if (TREE_CODE (newdecl) == FIELD_DECL)
2175 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2177 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2178 with that from NEWDECL below. */
2179 if (DECL_LANG_SPECIFIC (olddecl))
2181 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2182 != DECL_LANG_SPECIFIC (newdecl));
2183 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2186 /* Merge the USED information. */
2187 if (TREE_USED (olddecl))
2188 TREE_USED (newdecl) = 1;
2189 else if (TREE_USED (newdecl))
2190 TREE_USED (olddecl) = 1;
2191 if (TREE_CODE (newdecl) == VAR_DECL)
2193 if (DECL_READ_P (olddecl))
2194 DECL_READ_P (newdecl) = 1;
2195 else if (DECL_READ_P (newdecl))
2196 DECL_READ_P (olddecl) = 1;
2198 if (DECL_PRESERVE_P (olddecl))
2199 DECL_PRESERVE_P (newdecl) = 1;
2200 else if (DECL_PRESERVE_P (newdecl))
2201 DECL_PRESERVE_P (olddecl) = 1;
2203 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2207 function_size = sizeof (struct tree_decl_common);
2209 memcpy ((char *) olddecl + sizeof (struct tree_common),
2210 (char *) newdecl + sizeof (struct tree_common),
2211 function_size - sizeof (struct tree_common));
2213 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2214 (char *) newdecl + sizeof (struct tree_decl_common),
2215 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2216 if (new_template_info)
2217 /* If newdecl is a template instantiation, it is possible that
2218 the following sequence of events has occurred:
2220 o A friend function was declared in a class template. The
2221 class template was instantiated.
2223 o The instantiation of the friend declaration was
2224 recorded on the instantiation list, and is newdecl.
2226 o Later, however, instantiate_class_template called pushdecl
2227 on the newdecl to perform name injection. But, pushdecl in
2228 turn called duplicate_decls when it discovered that another
2229 declaration of a global function with the same name already
2232 o Here, in duplicate_decls, we decided to clobber newdecl.
2234 If we're going to do that, we'd better make sure that
2235 olddecl, and not newdecl, is on the list of
2236 instantiations so that if we try to do the instantiation
2237 again we won't get the clobbered declaration. */
2238 reregister_specialization (newdecl,
2244 size_t size = tree_code_size (TREE_CODE (olddecl));
2245 memcpy ((char *) olddecl + sizeof (struct tree_common),
2246 (char *) newdecl + sizeof (struct tree_common),
2247 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2248 switch (TREE_CODE (olddecl))
2258 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2259 (char *) newdecl + sizeof (struct tree_decl_common),
2260 size - sizeof (struct tree_decl_common)
2261 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2265 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2266 (char *) newdecl + sizeof (struct tree_decl_common),
2267 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2268 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2272 DECL_UID (olddecl) = olddecl_uid;
2274 DECL_FRIEND_P (olddecl) = 1;
2277 DECL_ANTICIPATED (olddecl) = 1;
2278 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2281 /* NEWDECL contains the merged attribute lists.
2282 Update OLDDECL to be the same. */
2283 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2285 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2286 so that encode_section_info has a chance to look at the new decl
2287 flags and attributes. */
2288 if (DECL_RTL_SET_P (olddecl)
2289 && (TREE_CODE (olddecl) == FUNCTION_DECL
2290 || (TREE_CODE (olddecl) == VAR_DECL
2291 && TREE_STATIC (olddecl))))
2292 make_decl_rtl (olddecl);
2294 /* The NEWDECL will no longer be needed. Because every out-of-class
2295 declaration of a member results in a call to duplicate_decls,
2296 freeing these nodes represents in a significant savings. */
2302 /* Return zero if the declaration NEWDECL is valid
2303 when the declaration OLDDECL (assumed to be for the same name)
2304 has already been seen.
2305 Otherwise return an error message format string with a %s
2306 where the identifier should go. */
2309 redeclaration_error_message (tree newdecl, tree olddecl)
2311 if (TREE_CODE (newdecl) == TYPE_DECL)
2313 /* Because C++ can put things into name space for free,
2314 constructs like "typedef struct foo { ... } foo"
2315 would look like an erroneous redeclaration. */
2316 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2319 return G_("redefinition of %q#D");
2321 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2323 /* If this is a pure function, its olddecl will actually be
2324 the original initialization to `0' (which we force to call
2325 abort()). Don't complain about redefinition in this case. */
2326 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2327 && DECL_INITIAL (olddecl) == NULL_TREE)
2330 /* If both functions come from different namespaces, this is not
2331 a redeclaration - this is a conflict with a used function. */
2332 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2333 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2334 && ! decls_match (olddecl, newdecl))
2335 return G_("%qD conflicts with used function");
2337 /* We'll complain about linkage mismatches in
2338 warn_extern_redeclared_static. */
2340 /* Defining the same name twice is no good. */
2341 if (DECL_INITIAL (olddecl) != NULL_TREE
2342 && DECL_INITIAL (newdecl) != NULL_TREE)
2344 if (DECL_NAME (olddecl) == NULL_TREE)
2345 return G_("%q#D not declared in class");
2346 else if (!GNU_INLINE_P (olddecl)
2347 || GNU_INLINE_P (newdecl))
2348 return G_("redefinition of %q#D");
2351 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2353 bool olda = GNU_INLINE_P (olddecl);
2354 bool newa = GNU_INLINE_P (newdecl);
2359 return G_("%q+D redeclared inline with "
2360 "%<gnu_inline%> attribute");
2362 return G_("%q+D redeclared inline without "
2363 "%<gnu_inline%> attribute");
2369 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2373 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2375 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2376 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2377 return G_("redefinition of %q#D");
2381 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2382 || (DECL_TEMPLATE_RESULT (newdecl)
2383 == DECL_TEMPLATE_RESULT (olddecl)))
2386 nt = DECL_TEMPLATE_RESULT (newdecl);
2387 if (DECL_TEMPLATE_INFO (nt))
2388 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2389 ot = DECL_TEMPLATE_RESULT (olddecl);
2390 if (DECL_TEMPLATE_INFO (ot))
2391 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2392 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2393 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2394 return G_("redefinition of %q#D");
2396 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2398 bool olda = GNU_INLINE_P (ot);
2399 bool newa = GNU_INLINE_P (nt);
2404 return G_("%q+D redeclared inline with "
2405 "%<gnu_inline%> attribute");
2407 return G_("%q+D redeclared inline without "
2408 "%<gnu_inline%> attribute");
2412 /* Core issue #226 (C++0x):
2414 If a friend function template declaration specifies a
2415 default template-argument, that declaration shall be a
2416 definition and shall be the only declaration of the
2417 function template in the translation unit. */
2418 if ((cxx_dialect != cxx98)
2419 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2420 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2421 /*is_primary=*/1, /*is_partial=*/0,
2422 /*is_friend_decl=*/2))
2423 return G_("redeclaration of friend %q#D "
2424 "may not have default template arguments");
2428 else if (TREE_CODE (newdecl) == VAR_DECL
2429 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2430 && (! DECL_LANG_SPECIFIC (olddecl)
2431 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2432 || DECL_THREAD_LOCAL_P (newdecl)))
2434 /* Only variables can be thread-local, and all declarations must
2435 agree on this property. */
2436 if (DECL_THREAD_LOCAL_P (newdecl))
2437 return G_("thread-local declaration of %q#D follows "
2438 "non-thread-local declaration");
2440 return G_("non-thread-local declaration of %q#D follows "
2441 "thread-local declaration");
2443 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2445 /* The objects have been declared at namespace scope. If either
2446 is a member of an anonymous union, then this is an invalid
2447 redeclaration. For example:
2453 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2454 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2455 return G_("redeclaration of %q#D");
2456 /* If at least one declaration is a reference, there is no
2457 conflict. For example:
2463 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2465 /* Reject two definitions. */
2466 return G_("redefinition of %q#D");
2470 /* Objects declared with block scope: */
2471 /* Reject two definitions, and reject a definition
2472 together with an external reference. */
2473 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2474 return G_("redeclaration of %q#D");
2479 /* Hash and equality functions for the named_label table. */
2482 named_label_entry_hash (const void *data)
2484 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2485 return DECL_UID (ent->label_decl);
2489 named_label_entry_eq (const void *a, const void *b)
2491 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2492 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2493 return ent_a->label_decl == ent_b->label_decl;
2496 /* Create a new label, named ID. */
2499 make_label_decl (tree id, int local_p)
2501 struct named_label_entry *ent;
2505 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2507 DECL_CONTEXT (decl) = current_function_decl;
2508 DECL_MODE (decl) = VOIDmode;
2509 C_DECLARED_LABEL_FLAG (decl) = local_p;
2511 /* Say where one reference is to the label, for the sake of the
2512 error if it is not defined. */
2513 DECL_SOURCE_LOCATION (decl) = input_location;
2515 /* Record the fact that this identifier is bound to this label. */
2516 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2518 /* Create the label htab for the function on demand. */
2520 named_labels = htab_create_ggc (13, named_label_entry_hash,
2521 named_label_entry_eq, NULL);
2523 /* Record this label on the list of labels used in this function.
2524 We do this before calling make_label_decl so that we get the
2525 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2526 ent = ggc_alloc_cleared_named_label_entry ();
2527 ent->label_decl = decl;
2529 slot = htab_find_slot (named_labels, ent, INSERT);
2530 gcc_assert (*slot == NULL);
2536 /* Look for a label named ID in the current function. If one cannot
2537 be found, create one. (We keep track of used, but undefined,
2538 labels, and complain about them at the end of a function.) */
2541 lookup_label_1 (tree id)
2545 /* You can't use labels at global scope. */
2546 if (current_function_decl == NULL_TREE)
2548 error ("label %qE referenced outside of any function", id);
2552 /* See if we've already got this label. */
2553 decl = IDENTIFIER_LABEL_VALUE (id);
2554 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2557 decl = make_label_decl (id, /*local_p=*/0);
2561 /* Wrapper for lookup_label_1. */
2564 lookup_label (tree id)
2567 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2568 ret = lookup_label_1 (id);
2569 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2573 /* Declare a local label named ID. */
2576 declare_local_label (tree id)
2579 cp_label_binding *bind;
2581 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2582 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2583 bind = VEC_safe_push (cp_label_binding, gc,
2584 current_binding_level->shadowed_labels, NULL);
2585 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2587 decl = make_label_decl (id, /*local_p=*/1);
2593 /* Returns nonzero if it is ill-formed to jump past the declaration of
2594 DECL. Returns 2 if it's also a real problem. */
2597 decl_jump_unsafe (tree decl)
2599 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2600 with automatic storage duration is not in scope to a point where it is
2601 in scope is ill-formed unless the variable has scalar type, class type
2602 with a trivial default constructor and a trivial destructor, a
2603 cv-qualified version of one of these types, or an array of one of the
2604 preceding types and is declared without an initializer (8.5). */
2605 tree type = TREE_TYPE (decl);
2607 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2608 || type == error_mark_node)
2611 type = strip_array_types (type);
2613 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2614 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2617 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2623 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2626 identify_goto (tree decl, const location_t *locus)
2629 permerror (input_location, "jump to label %qD", decl);
2631 permerror (input_location, "jump to case label");
2633 permerror (*locus, " from here");
2636 /* Check that a single previously seen jump to a newly defined label
2637 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2638 the jump context; NAMES are the names in scope in LEVEL at the jump
2639 context; LOCUS is the source position of the jump or 0. Returns
2640 true if all is well. */
2643 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2644 bool exited_omp, const location_t *locus)
2646 struct cp_binding_level *b;
2647 bool identified = false, saw_eh = false, saw_omp = false;
2651 identify_goto (decl, locus);
2652 error (" exits OpenMP structured block");
2653 identified = saw_omp = true;
2656 for (b = current_binding_level; b ; b = b->level_chain)
2658 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2660 for (new_decls = b->names; new_decls != old_decls;
2661 new_decls = DECL_CHAIN (new_decls))
2663 int problem = decl_jump_unsafe (new_decls);
2669 identify_goto (decl, locus);
2673 error (" crosses initialization of %q+#D", new_decls);
2675 permerror (input_location, " enters scope of %q+#D which has "
2676 "non-trivial destructor", new_decls);
2681 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2685 identify_goto (decl, locus);
2688 if (b->kind == sk_try)
2689 error (" enters try block");
2691 error (" enters catch block");
2694 if (b->kind == sk_omp && !saw_omp)
2698 identify_goto (decl, locus);
2701 error (" enters OpenMP structured block");
2710 check_previous_goto (tree decl, struct named_label_use_entry *use)
2712 check_previous_goto_1 (decl, use->binding_level,
2713 use->names_in_scope, use->in_omp_scope,
2714 &use->o_goto_locus);
2718 check_switch_goto (struct cp_binding_level* level)
2720 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2723 /* Check that a new jump to a label DECL is OK. Called by
2724 finish_goto_stmt. */
2727 check_goto (tree decl)
2729 struct named_label_entry *ent, dummy;
2730 bool saw_catch = false, identified = false;
2734 /* We can't know where a computed goto is jumping.
2735 So we assume that it's OK. */
2736 if (TREE_CODE (decl) != LABEL_DECL)
2739 /* We didn't record any information about this label when we created it,
2740 and there's not much point since it's trivial to analyze as a return. */
2741 if (decl == cdtor_label)
2744 dummy.label_decl = decl;
2745 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2746 gcc_assert (ent != NULL);
2748 /* If the label hasn't been defined yet, defer checking. */
2749 if (! DECL_INITIAL (decl))
2751 struct named_label_use_entry *new_use;
2753 /* Don't bother creating another use if the last goto had the
2754 same data, and will therefore create the same set of errors. */
2756 && ent->uses->names_in_scope == current_binding_level->names)
2759 new_use = ggc_alloc_named_label_use_entry ();
2760 new_use->binding_level = current_binding_level;
2761 new_use->names_in_scope = current_binding_level->names;
2762 new_use->o_goto_locus = input_location;
2763 new_use->in_omp_scope = false;
2765 new_use->next = ent->uses;
2766 ent->uses = new_use;
2770 if (ent->in_try_scope || ent->in_catch_scope
2771 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2773 permerror (input_location, "jump to label %q+D", decl);
2774 permerror (input_location, " from here");
2778 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2780 int u = decl_jump_unsafe (bad);
2782 if (u > 1 && DECL_ARTIFICIAL (bad))
2784 /* Can't skip init of __exception_info. */
2785 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2789 error (" skips initialization of %q+#D", bad);
2791 permerror (input_location, " enters scope of %q+#D which has "
2792 "non-trivial destructor", bad);
2795 if (ent->in_try_scope)
2796 error (" enters try block");
2797 else if (ent->in_catch_scope && !saw_catch)
2798 error (" enters catch block");
2800 if (ent->in_omp_scope)
2801 error (" enters OpenMP structured block");
2802 else if (flag_openmp)
2804 struct cp_binding_level *b;
2805 for (b = current_binding_level; b ; b = b->level_chain)
2807 if (b == ent->binding_level)
2809 if (b->kind == sk_omp)
2813 permerror (input_location, "jump to label %q+D", decl);
2814 permerror (input_location, " from here");
2817 error (" exits OpenMP structured block");
2824 /* Check that a return is ok wrt OpenMP structured blocks.
2825 Called by finish_return_stmt. Returns true if all is well. */
2828 check_omp_return (void)
2830 struct cp_binding_level *b;
2831 for (b = current_binding_level; b ; b = b->level_chain)
2832 if (b->kind == sk_omp)
2834 error ("invalid exit from OpenMP structured block");
2837 else if (b->kind == sk_function_parms)
2842 /* Define a label, specifying the location in the source file.
2843 Return the LABEL_DECL node for the label. */
2846 define_label_1 (location_t location, tree name)
2848 struct named_label_entry *ent, dummy;
2849 struct cp_binding_level *p;
2852 decl = lookup_label (name);
2854 dummy.label_decl = decl;
2855 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2856 gcc_assert (ent != NULL);
2858 /* After labels, make any new cleanups in the function go into their
2859 own new (temporary) binding contour. */
2860 for (p = current_binding_level;
2861 p->kind != sk_function_parms;
2863 p->more_cleanups_ok = 0;
2865 if (name == get_identifier ("wchar_t"))
2866 permerror (input_location, "label named wchar_t");
2868 if (DECL_INITIAL (decl) != NULL_TREE)
2870 error ("duplicate label %qD", decl);
2871 return error_mark_node;
2875 struct named_label_use_entry *use;
2877 /* Mark label as having been defined. */
2878 DECL_INITIAL (decl) = error_mark_node;
2879 /* Say where in the source. */
2880 DECL_SOURCE_LOCATION (decl) = location;
2882 ent->binding_level = current_binding_level;
2883 ent->names_in_scope = current_binding_level->names;
2885 for (use = ent->uses; use ; use = use->next)
2886 check_previous_goto (decl, use);
2893 /* Wrapper for define_label_1. */
2896 define_label (location_t location, tree name)
2899 timevar_start (TV_NAME_LOOKUP);
2900 ret = define_label_1 (location, name);
2901 timevar_stop (TV_NAME_LOOKUP);
2908 struct cp_binding_level *level;
2909 struct cp_switch *next;
2910 /* The SWITCH_STMT being built. */
2912 /* A splay-tree mapping the low element of a case range to the high
2913 element, or NULL_TREE if there is no high element. Used to
2914 determine whether or not a new case label duplicates an old case
2915 label. We need a tree, rather than simply a hash table, because
2916 of the GNU case range extension. */
2920 /* A stack of the currently active switch statements. The innermost
2921 switch statement is on the top of the stack. There is no need to
2922 mark the stack for garbage collection because it is only active
2923 during the processing of the body of a function, and we never
2924 collect at that point. */
2926 static struct cp_switch *switch_stack;
2928 /* Called right after a switch-statement condition is parsed.
2929 SWITCH_STMT is the switch statement being parsed. */
2932 push_switch (tree switch_stmt)
2934 struct cp_switch *p = XNEW (struct cp_switch);
2935 p->level = current_binding_level;
2936 p->next = switch_stack;
2937 p->switch_stmt = switch_stmt;
2938 p->cases = splay_tree_new (case_compare, NULL, NULL);
2945 struct cp_switch *cs = switch_stack;
2946 location_t switch_location;
2948 /* Emit warnings as needed. */
2949 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2950 if (!processing_template_decl)
2951 c_do_switch_warnings (cs->cases, switch_location,
2952 SWITCH_STMT_TYPE (cs->switch_stmt),
2953 SWITCH_STMT_COND (cs->switch_stmt));
2955 splay_tree_delete (cs->cases);
2956 switch_stack = switch_stack->next;
2960 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2961 condition. Note that if TYPE and VALUE are already integral we don't
2962 really do the conversion because the language-independent
2963 warning/optimization code will work better that way. */
2966 case_conversion (tree type, tree value)
2968 if (value == NULL_TREE)
2971 if (cxx_dialect >= cxx0x
2972 && (SCOPED_ENUM_P (type)
2973 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
2975 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2976 type = type_promotes_to (type);
2977 value = perform_implicit_conversion (type, value, tf_warning_or_error);
2979 return cxx_constant_value (value);
2982 /* Note that we've seen a definition of a case label, and complain if this
2983 is a bad place for one. */
2986 finish_case_label (location_t loc, tree low_value, tree high_value)
2989 struct cp_binding_level *p;
2992 if (processing_template_decl)
2996 /* For templates, just add the case label; we'll do semantic
2997 analysis at instantiation-time. */
2998 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2999 return add_stmt (build_case_label (low_value, high_value, label));
3002 /* Find the condition on which this switch statement depends. */
3003 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3004 if (cond && TREE_CODE (cond) == TREE_LIST)
3005 cond = TREE_VALUE (cond);
3007 if (!check_switch_goto (switch_stack->level))
3008 return error_mark_node;
3010 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3012 low_value = case_conversion (type, low_value);
3013 high_value = case_conversion (type, high_value);
3015 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3016 low_value, high_value);
3018 /* After labels, make any new cleanups in the function go into their
3019 own new (temporary) binding contour. */
3020 for (p = current_binding_level;
3021 p->kind != sk_function_parms;
3023 p->more_cleanups_ok = 0;
3028 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3031 typename_hash (const void* k)
3034 const_tree const t = (const_tree) k;
3036 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3037 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3042 typedef struct typename_info {
3050 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3051 really of type `typename_info*' */
3054 typename_compare (const void * k1, const void * k2)
3056 const_tree const t1 = (const_tree) k1;
3057 const typename_info *const t2 = (const typename_info *) k2;
3059 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3060 && TYPE_CONTEXT (t1) == t2->scope
3061 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3062 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3063 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3066 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3067 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3069 Returns the new TYPENAME_TYPE. */
3071 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3074 build_typename_type (tree context, tree name, tree fullname,
3075 enum tag_types tag_type)
3083 if (typename_htab == NULL)
3084 typename_htab = htab_create_ggc (61, &typename_hash,
3085 &typename_compare, NULL);
3087 ti.scope = FROB_CONTEXT (context);
3089 ti.template_id = fullname;
3090 ti.enum_p = tag_type == enum_type;
3091 ti.class_p = (tag_type == class_type
3092 || tag_type == record_type
3093 || tag_type == union_type);
3094 hash = (htab_hash_pointer (ti.scope)
3095 ^ htab_hash_pointer (ti.name));
3097 /* See if we already have this type. */
3098 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3103 /* Build the TYPENAME_TYPE. */
3104 t = cxx_make_type (TYPENAME_TYPE);
3105 TYPE_CONTEXT (t) = ti.scope;
3106 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3107 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3108 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3110 /* Build the corresponding TYPE_DECL. */
3111 d = build_decl (input_location, TYPE_DECL, name, t);
3112 TYPE_NAME (TREE_TYPE (d)) = d;
3113 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3114 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3115 DECL_ARTIFICIAL (d) = 1;
3117 /* Store it in the hash table. */
3120 /* TYPENAME_TYPEs must always be compared structurally, because
3121 they may or may not resolve down to another type depending on
3122 the currently open classes. */
3123 SET_TYPE_STRUCTURAL_EQUALITY (t);
3129 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3130 provided to name the type. Returns an appropriate type, unless an
3131 error occurs, in which case error_mark_node is returned. If we
3132 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3133 return that, rather than the _TYPE it corresponds to, in other
3134 cases we look through the type decl. If TF_ERROR is set, complain
3135 about errors, otherwise be quiet. */
3138 make_typename_type (tree context, tree name, enum tag_types tag_type,
3139 tsubst_flags_t complain)
3145 if (name == error_mark_node
3146 || context == NULL_TREE
3147 || context == error_mark_node)
3148 return error_mark_node;
3152 if (!(TYPE_LANG_SPECIFIC (name)
3153 && (CLASSTYPE_IS_TEMPLATE (name)
3154 || CLASSTYPE_USE_TEMPLATE (name))))
3155 name = TYPE_IDENTIFIER (name);
3157 /* Create a TEMPLATE_ID_EXPR for the type. */
3158 name = build_nt (TEMPLATE_ID_EXPR,
3159 CLASSTYPE_TI_TEMPLATE (name),
3160 CLASSTYPE_TI_ARGS (name));
3162 else if (TREE_CODE (name) == TYPE_DECL)
3163 name = DECL_NAME (name);
3167 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3169 name = TREE_OPERAND (name, 0);
3170 if (TREE_CODE (name) == TEMPLATE_DECL)
3171 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3172 else if (TREE_CODE (name) == OVERLOAD)
3174 error ("%qD is not a type", name);
3175 return error_mark_node;
3178 if (TREE_CODE (name) == TEMPLATE_DECL)
3180 error ("%qD used without template parameters", name);
3181 return error_mark_node;
3183 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3184 gcc_assert (TYPE_P (context));
3186 if (!MAYBE_CLASS_TYPE_P (context))
3188 if (complain & tf_error)
3189 error ("%q#T is not a class", context);
3190 return error_mark_node;
3193 /* When the CONTEXT is a dependent type, NAME could refer to a
3194 dependent base class of CONTEXT. But look inside it anyway
3195 if CONTEXT is a currently open scope, in case it refers to a
3196 member of the current instantiation or a non-dependent base;
3197 lookup will stop when we hit a dependent base. */
3198 if (!dependent_scope_p (context))
3199 /* We should only set WANT_TYPE when we're a nested typename type.
3200 Then we can give better diagnostics if we find a non-type. */
3201 t = lookup_field (context, name, 2, /*want_type=*/true);
3205 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3206 return build_typename_type (context, name, fullname, tag_type);
3208 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3212 if (complain & tf_error)
3213 error (want_template ? "no class template named %q#T in %q#T"
3214 : "no type named %q#T in %q#T", name, context);
3215 return error_mark_node;
3218 /* Pull out the template from an injected-class-name (or multiple). */
3220 t = maybe_get_template_decl_from_type_decl (t);
3222 if (TREE_CODE (t) == TREE_LIST)
3224 if (complain & tf_error)
3226 error ("lookup of %qT in %qT is ambiguous", name, context);
3227 print_candidates (t);
3229 return error_mark_node;
3232 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3234 if (complain & tf_error)
3235 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3237 return error_mark_node;
3239 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3241 if (complain & tf_error)
3242 error ("%<typename %T::%D%> names %q#T, which is not a type",
3244 return error_mark_node;
3247 if (complain & tf_error)
3248 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3250 /* If we are currently parsing a template and if T is a typedef accessed
3251 through CONTEXT then we need to remember and check access of T at
3252 template instantiation time. */
3253 add_typedef_to_current_template_for_access_check (t, context, input_location);
3256 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3258 /*entering_scope=*/0,
3259 tf_warning_or_error | tf_user);
3261 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3267 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3268 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3269 in which case error_mark_node is returned.
3271 If PARM_LIST is non-NULL, also make sure that the template parameter
3272 list of TEMPLATE_DECL matches.
3274 If COMPLAIN zero, don't complain about any errors that occur. */
3277 make_unbound_class_template (tree context, tree name, tree parm_list,
3278 tsubst_flags_t complain)
3284 name = TYPE_IDENTIFIER (name);
3285 else if (DECL_P (name))
3286 name = DECL_NAME (name);
3287 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3289 if (!dependent_type_p (context)
3290 || currently_open_class (context))
3292 tree tmpl = NULL_TREE;
3294 if (MAYBE_CLASS_TYPE_P (context))
3295 tmpl = lookup_field (context, name, 0, false);
3297 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3298 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3300 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3302 if (complain & tf_error)
3303 error ("no class template named %q#T in %q#T", name, context);
3304 return error_mark_node;
3308 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3310 if (complain & tf_error)
3312 error ("template parameters do not match template");
3313 error ("%q+D declared here", tmpl);
3315 return error_mark_node;
3318 if (complain & tf_error)
3319 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3324 /* Build the UNBOUND_CLASS_TEMPLATE. */
3325 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3326 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3327 TREE_TYPE (t) = NULL_TREE;
3328 SET_TYPE_STRUCTURAL_EQUALITY (t);
3330 /* Build the corresponding TEMPLATE_DECL. */
3331 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3332 TYPE_NAME (TREE_TYPE (d)) = d;
3333 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3334 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3335 DECL_ARTIFICIAL (d) = 1;
3336 DECL_TEMPLATE_PARMS (d) = parm_list;
3343 /* Push the declarations of builtin types into the namespace.
3344 RID_INDEX is the index of the builtin type in the array
3345 RID_POINTERS. NAME is the name used when looking up the builtin
3346 type. TYPE is the _TYPE node for the builtin type. */
3349 record_builtin_type (enum rid rid_index,
3353 tree rname = NULL_TREE, tname = NULL_TREE;
3354 tree tdecl = NULL_TREE;
3356 if ((int) rid_index < (int) RID_MAX)
3357 rname = ridpointers[(int) rid_index];
3359 tname = get_identifier (name);
3361 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3362 eliminated. Built-in types should not be looked up name; their
3363 names are keywords that the parser can recognize. However, there
3364 is code in c-common.c that uses identifier_global_value to look
3365 up built-in types by name. */
3368 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3369 DECL_ARTIFICIAL (tdecl) = 1;
3370 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3376 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3377 DECL_ARTIFICIAL (tdecl) = 1;
3379 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3382 if (!TYPE_NAME (type))
3383 TYPE_NAME (type) = tdecl;
3386 debug_hooks->type_decl (tdecl, 0);
3389 /* Record one of the standard Java types.
3390 * Declare it as having the given NAME.
3391 * If SIZE > 0, it is the size of one of the integral types;
3392 * otherwise it is the negative of the size of one of the other types. */
3395 record_builtin_java_type (const char* name, int size)
3400 type = build_nonstandard_integer_type (size, 0);
3401 type = build_distinct_type_copy (type);
3403 else if (size > -32)
3406 /* "__java_char" or ""__java_boolean". */
3407 type = build_nonstandard_integer_type (-size, 1);
3408 type = build_distinct_type_copy (type);
3409 /* Get the signed type cached and attached to the unsigned type,
3410 so it doesn't get garbage-collected at "random" times,
3411 causing potential codegen differences out of different UIDs
3412 and different alias set numbers. */
3413 stype = build_nonstandard_integer_type (-size, 0);
3414 stype = build_distinct_type_copy (stype);
3415 TREE_CHAIN (type) = stype;
3416 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3419 { /* "__java_float" or ""__java_double". */
3420 type = make_node (REAL_TYPE);
3421 TYPE_PRECISION (type) = - size;
3424 record_builtin_type (RID_MAX, name, type);
3425 decl = TYPE_NAME (type);
3427 /* Suppress generate debug symbol entries for these types,
3428 since for normal C++ they are just clutter.
3429 However, push_lang_context undoes this if extern "Java" is seen. */
3430 DECL_IGNORED_P (decl) = 1;
3432 TYPE_FOR_JAVA (type) = 1;
3436 /* Push a type into the namespace so that the back ends ignore it. */
3439 record_unknown_type (tree type, const char* name)
3441 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3442 TYPE_DECL, get_identifier (name), type));
3443 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3444 DECL_IGNORED_P (decl) = 1;
3445 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3446 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3447 TYPE_ALIGN (type) = 1;
3448 TYPE_USER_ALIGN (type) = 0;
3449 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3452 /* A string for which we should create an IDENTIFIER_NODE at
3455 typedef struct predefined_identifier
3457 /* The name of the identifier. */
3458 const char *const name;
3459 /* The place where the IDENTIFIER_NODE should be stored. */
3461 /* Nonzero if this is the name of a constructor or destructor. */
3462 const int ctor_or_dtor_p;
3463 } predefined_identifier;
3465 /* Create all the predefined identifiers. */
3468 initialize_predefined_identifiers (void)
3470 const predefined_identifier *pid;
3472 /* A table of identifiers to create at startup. */
3473 static const predefined_identifier predefined_identifiers[] = {
3474 { "C++", &lang_name_cplusplus, 0 },
3475 { "C", &lang_name_c, 0 },
3476 { "Java", &lang_name_java, 0 },
3477 /* Some of these names have a trailing space so that it is
3478 impossible for them to conflict with names written by users. */
3479 { "__ct ", &ctor_identifier, 1 },
3480 { "__base_ctor ", &base_ctor_identifier, 1 },
3481 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3482 { "__dt ", &dtor_identifier, 1 },
3483 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3484 { "__base_dtor ", &base_dtor_identifier, 1 },
3485 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3486 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3487 { "nelts", &nelts_identifier, 0 },
3488 { THIS_NAME, &this_identifier, 0 },
3489 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3490 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3491 { "_vptr", &vptr_identifier, 0 },
3492 { "__vtt_parm", &vtt_parm_identifier, 0 },
3493 { "::", &global_scope_name, 0 },
3494 { "std", &std_identifier, 0 },
3498 for (pid = predefined_identifiers; pid->name; ++pid)
3500 *pid->node = get_identifier (pid->name);
3501 if (pid->ctor_or_dtor_p)
3502 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3506 /* Create the predefined scalar types of C,
3507 and some nodes representing standard constants (0, 1, (void *)0).
3508 Initialize the global binding level.
3509 Make definitions for built-in primitive functions. */
3512 cxx_init_decl_processing (void)
3515 tree void_ftype_ptr;
3517 build_common_tree_nodes (flag_signed_char);
3519 /* Create all the identifiers we need. */
3520 initialize_predefined_identifiers ();
3522 /* Create the global variables. */
3523 push_to_top_level ();
3525 current_function_decl = NULL_TREE;
3526 current_binding_level = NULL;
3527 /* Enter the global namespace. */
3528 gcc_assert (global_namespace == NULL_TREE);
3529 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3531 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3532 TREE_PUBLIC (global_namespace) = 1;
3533 begin_scope (sk_namespace, global_namespace);
3535 current_lang_name = NULL_TREE;
3537 if (flag_visibility_ms_compat)
3538 default_visibility = VISIBILITY_HIDDEN;
3541 current_lang_name = lang_name_c;
3543 /* Create the `std' namespace. */
3544 push_namespace (std_identifier);
3545 std_node = current_namespace;
3548 c_common_nodes_and_builtins ();
3550 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3551 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3552 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3553 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3554 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3555 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3556 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3557 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3559 integer_two_node = build_int_cst (NULL_TREE, 2);
3561 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3562 truthvalue_type_node = boolean_type_node;
3563 truthvalue_false_node = boolean_false_node;
3564 truthvalue_true_node = boolean_true_node;
3566 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3567 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3568 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3571 record_builtin_type (RID_MAX, NULL, string_type_node);
3574 delta_type_node = ptrdiff_type_node;
3575 vtable_index_type = ptrdiff_type_node;
3577 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3578 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3579 void_ftype_ptr = build_function_type_list (void_type_node,
3580 ptr_type_node, NULL_TREE);
3582 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3584 /* C++ extensions */
3586 unknown_type_node = make_node (LANG_TYPE);
3587 record_unknown_type (unknown_type_node, "unknown type");
3589 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3590 TREE_TYPE (unknown_type_node) = unknown_type_node;
3592 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3594 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3595 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3597 init_list_type_node = make_node (LANG_TYPE);
3598 record_unknown_type (init_list_type_node, "init list");
3601 /* Make sure we get a unique function type, so we can give
3602 its pointer type a name. (This wins for gdb.) */
3603 tree vfunc_type = make_node (FUNCTION_TYPE);
3604 TREE_TYPE (vfunc_type) = integer_type_node;
3605 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3606 layout_type (vfunc_type);
3608 vtable_entry_type = build_pointer_type (vfunc_type);
3610 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3613 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3614 layout_type (vtbl_type_node);
3615 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3616 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3617 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3618 layout_type (vtbl_ptr_type_node);
3619 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3621 push_namespace (get_identifier ("__cxxabiv1"));
3622 abi_node = current_namespace;
3625 global_type_node = make_node (LANG_TYPE);
3626 record_unknown_type (global_type_node, "global type");
3629 current_lang_name = lang_name_cplusplus;
3632 tree newtype, deltype;
3633 tree ptr_ftype_sizetype;
3637 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3638 if (cxx_dialect == cxx98)
3641 tree bad_alloc_type_node;
3642 tree bad_alloc_decl;
3644 push_namespace (std_identifier);
3645 bad_alloc_id = get_identifier ("bad_alloc");
3646 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3647 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3649 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3650 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3654 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3657 new_eh_spec = noexcept_false_spec;
3659 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3660 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3661 push_cp_library_fn (NEW_EXPR, newtype);
3662 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3663 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3664 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3666 nullptr_type_node = make_node (NULLPTR_TYPE);
3667 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3668 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3669 TYPE_UNSIGNED (nullptr_type_node) = 1;
3670 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3671 SET_TYPE_MODE (nullptr_type_node, Pmode);
3672 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3673 nullptr_node = build_int_cst (nullptr_type_node, 0);
3677 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3679 /* Perform other language dependent initializations. */
3680 init_class_processing ();
3681 init_rtti_processing ();
3682 init_template_processing ();
3684 if (flag_exceptions)
3685 init_exception_processing ();
3687 if (! supports_one_only ())
3690 make_fname_decl = cp_make_fname_decl;
3691 start_fname_decls ();
3693 /* Show we use EH for cleanups. */
3694 if (flag_exceptions)
3695 using_eh_for_cleanups ();
3698 /* Generate an initializer for a function naming variable from
3699 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3700 filled in with the type of the init. */
3703 cp_fname_init (const char* name, tree *type_p)
3705 tree domain = NULL_TREE;
3707 tree init = NULL_TREE;
3712 length = strlen (name);
3713 domain = build_index_type (size_int (length));
3714 init = build_string (length + 1, name);
3717 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3718 type = build_cplus_array_type (type, domain);
3723 TREE_TYPE (init) = type;
3725 init = error_mark_node;
3730 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3731 the decl, LOC is the location to give the decl, NAME is the
3732 initialization string and TYPE_DEP indicates whether NAME depended
3733 on the type of the function. We make use of that to detect
3734 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3735 at the point of first use, so we mustn't push the decl now. */
3738 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3740 const char *const name = (type_dep && processing_template_decl
3741 ? NULL : fname_as_string (type_dep));
3743 tree init = cp_fname_init (name, &type);
3744 tree decl = build_decl (loc, VAR_DECL, id, type);
3747 free (CONST_CAST (char *, name));
3749 /* As we're using pushdecl_with_scope, we must set the context. */
3750 DECL_CONTEXT (decl) = current_function_decl;
3751 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3753 TREE_STATIC (decl) = 1;
3754 TREE_READONLY (decl) = 1;
3755 DECL_ARTIFICIAL (decl) = 1;
3757 TREE_USED (decl) = 1;
3759 if (current_function_decl)
3761 struct cp_binding_level *b = current_binding_level;
3762 if (b->kind == sk_function_parms)
3763 return error_mark_node;
3764 while (b->level_chain->kind != sk_function_parms)
3766 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3767 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3768 LOOKUP_ONLYCONVERTING);
3772 DECL_THIS_STATIC (decl) = true;
3773 pushdecl_top_level_and_finish (decl, init);
3780 builtin_function_1 (tree decl, tree context, bool is_global)
3782 tree id = DECL_NAME (decl);
3783 const char *name = IDENTIFIER_POINTER (id);
3785 retrofit_lang_decl (decl);
3787 DECL_ARTIFICIAL (decl) = 1;
3788 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3789 SET_DECL_LANGUAGE (decl, lang_c);
3790 /* Runtime library routines are, by definition, available in an
3791 external shared object. */
3792 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3793 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3795 DECL_CONTEXT (decl) = context;
3798 pushdecl_top_level (decl);
3802 /* A function in the user's namespace should have an explicit
3803 declaration before it is used. Mark the built-in function as
3804 anticipated but not actually declared. */
3805 if (name[0] != '_' || name[1] != '_')
3806 DECL_ANTICIPATED (decl) = 1;
3807 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3809 size_t len = strlen (name);
3811 /* Treat __*_chk fortification functions as anticipated as well,
3812 unless they are __builtin_*. */
3813 if (len > strlen ("___chk")
3814 && memcmp (name + len - strlen ("_chk"),
3815 "_chk", strlen ("_chk") + 1) == 0)
3816 DECL_ANTICIPATED (decl) = 1;
3823 cxx_builtin_function (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, false);
3837 return builtin_function_1 (decl, NULL_TREE, false);
3840 /* Like cxx_builtin_function, but guarantee the function is added to the global
3841 scope. This is to allow function specific options to add new machine
3842 dependent builtins when the target ISA changes via attribute((target(...)))
3843 which saves space on program startup if the program does not use non-generic
3847 cxx_builtin_function_ext_scope (tree decl)
3850 tree id = DECL_NAME (decl);
3851 const char *name = IDENTIFIER_POINTER (id);
3852 /* All builtins that don't begin with an '_' should additionally
3853 go in the 'std' namespace. */
3856 tree decl2 = copy_node(decl);
3857 push_namespace (std_identifier);
3858 builtin_function_1 (decl2, std_node, true);
3862 return builtin_function_1 (decl, NULL_TREE, true);
3865 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3866 function. Not called directly. */
3869 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3871 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3872 DECL_EXTERNAL (fn) = 1;
3873 TREE_PUBLIC (fn) = 1;
3874 DECL_ARTIFICIAL (fn) = 1;
3875 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3876 SET_DECL_LANGUAGE (fn, lang_c);
3877 /* Runtime library routines are, by definition, available in an
3878 external shared object. */
3879 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3880 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3884 /* Returns the _DECL for a library function with C linkage.
3885 We assume that such functions never throw; if this is incorrect,
3886 callers should unset TREE_NOTHROW. */
3889 build_library_fn (tree name, tree type)
3891 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3892 TREE_NOTHROW (fn) = 1;
3896 /* Returns the _DECL for a library function with C++ linkage. */
3899 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3901 tree fn = build_library_fn_1 (name, operator_code, type);
3902 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3903 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3904 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3908 /* Like build_library_fn, but takes a C string instead of an
3912 build_library_fn_ptr (const char* name, tree type)
3914 return build_library_fn (get_identifier (name), type);
3917 /* Like build_cp_library_fn, but takes a C string instead of an
3921 build_cp_library_fn_ptr (const char* name, tree type)
3923 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3926 /* Like build_library_fn, but also pushes the function so that we will
3927 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3928 may throw exceptions listed in RAISES. */
3931 push_library_fn (tree name, tree type, tree raises)
3936 type = build_exception_variant (type, raises);
3938 fn = build_library_fn (name, type);
3939 pushdecl_top_level (fn);
3943 /* Like build_cp_library_fn, but also pushes the function so that it
3944 will be found by normal lookup. */
3947 push_cp_library_fn (enum tree_code operator_code, tree type)
3949 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3956 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3960 push_void_library_fn (tree name, tree parmtypes)
3962 tree type = build_function_type (void_type_node, parmtypes);
3963 return push_library_fn (name, type, NULL_TREE);
3966 /* Like push_library_fn, but also note that this function throws
3967 and does not return. Used for __throw_foo and the like. */
3970 push_throw_library_fn (tree name, tree type)
3972 tree fn = push_library_fn (name, type, NULL_TREE);
3973 TREE_THIS_VOLATILE (fn) = 1;
3974 TREE_NOTHROW (fn) = 0;
3978 /* When we call finish_struct for an anonymous union, we create
3979 default copy constructors and such. But, an anonymous union
3980 shouldn't have such things; this function undoes the damage to the
3981 anonymous union type T.
3983 (The reason that we create the synthesized methods is that we don't
3984 distinguish `union { int i; }' from `typedef union { int i; } U'.
3985 The first is an anonymous union; the second is just an ordinary
3989 fixup_anonymous_aggr (tree t)
3993 /* Wipe out memory of synthesized methods. */
3994 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3995 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3996 TYPE_HAS_COPY_CTOR (t) = 0;
3997 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3998 TYPE_HAS_COPY_ASSIGN (t) = 0;
3999 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4001 /* Splice the implicitly generated functions out of the TYPE_METHODS
4003 q = &TYPE_METHODS (t);
4006 if (DECL_ARTIFICIAL (*q))
4007 *q = TREE_CHAIN (*q);
4009 q = &DECL_CHAIN (*q);
4012 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4013 if (TYPE_METHODS (t))
4015 tree decl = TYPE_MAIN_DECL (t);
4017 if (TREE_CODE (t) != UNION_TYPE)
4018 error_at (DECL_SOURCE_LOCATION (decl),
4019 "an anonymous struct cannot have function members");
4021 error_at (DECL_SOURCE_LOCATION (decl),
4022 "an anonymous union cannot have function members");
4025 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4026 assignment operators (because they cannot have these methods themselves).
4027 For anonymous unions this is already checked because they are not allowed
4028 in any union, otherwise we have to check it. */
4029 if (TREE_CODE (t) != UNION_TYPE)
4033 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4034 if (TREE_CODE (field) == FIELD_DECL)
4036 type = TREE_TYPE (field);
4037 if (CLASS_TYPE_P (type))
4039 if (TYPE_NEEDS_CONSTRUCTING (type))
4040 error ("member %q+#D with constructor not allowed "
4041 "in anonymous aggregate", field);
4042 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4043 error ("member %q+#D with destructor not allowed "
4044 "in anonymous aggregate", field);
4045 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4046 error ("member %q+#D with copy assignment operator "
4047 "not allowed in anonymous aggregate", field);
4053 /* Make sure that a declaration with no declarator is well-formed, i.e.
4054 just declares a tagged type or anonymous union.
4056 Returns the type declared; or NULL_TREE if none. */
4059 check_tag_decl (cp_decl_specifier_seq *declspecs)
4061 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4062 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4063 /* If a class, struct, or enum type is declared by the DECLSPECS
4064 (i.e, if a class-specifier, enum-specifier, or non-typename
4065 elaborated-type-specifier appears in the DECLSPECS),
4066 DECLARED_TYPE is set to the corresponding type. */
4067 tree declared_type = NULL_TREE;
4068 bool error_p = false;
4070 if (declspecs->multiple_types_p)
4071 error ("multiple types in one declaration");
4072 else if (declspecs->redefined_builtin_type)
4074 if (!in_system_header)
4075 permerror (input_location, "redeclaration of C++ built-in type %qT",
4076 declspecs->redefined_builtin_type);
4081 && TYPE_P (declspecs->type)
4082 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4083 && MAYBE_CLASS_TYPE_P (declspecs->type))
4084 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4085 declared_type = declspecs->type;
4086 else if (declspecs->type == error_mark_node)
4088 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4089 permerror (input_location, "declaration does not declare anything");
4090 /* Check for an anonymous union. */
4091 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4092 && TYPE_ANONYMOUS_P (declared_type))
4094 /* 7/3 In a simple-declaration, the optional init-declarator-list
4095 can be omitted only when declaring a class (clause 9) or
4096 enumeration (7.2), that is, when the decl-specifier-seq contains
4097 either a class-specifier, an elaborated-type-specifier with
4098 a class-key (9.1), or an enum-specifier. In these cases and
4099 whenever a class-specifier or enum-specifier is present in the
4100 decl-specifier-seq, the identifiers in these specifiers are among
4101 the names being declared by the declaration (as class-name,
4102 enum-names, or enumerators, depending on the syntax). In such
4103 cases, and except for the declaration of an unnamed bit-field (9.6),
4104 the decl-specifier-seq shall introduce one or more names into the
4105 program, or shall redeclare a name introduced by a previous
4106 declaration. [Example:
4107 enum { }; // ill-formed
4108 typedef class { }; // ill-formed
4112 error ("missing type-name in typedef-declaration");
4115 /* Anonymous unions are objects, so they can have specifiers. */;
4116 SET_ANON_AGGR_TYPE_P (declared_type);
4118 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4119 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4124 if (declspecs->specs[(int)ds_inline]
4125 || declspecs->specs[(int)ds_virtual])
4126 error ("%qs can only be specified for functions",
4127 declspecs->specs[(int)ds_inline]
4128 ? "inline" : "virtual");
4130 && (!current_class_type
4131 || current_scope () != current_class_type))
4132 error ("%<friend%> can only be specified inside a class");
4133 else if (declspecs->specs[(int)ds_explicit])
4134 error ("%<explicit%> can only be specified for constructors");
4135 else if (declspecs->storage_class)
4136 error ("a storage class can only be specified for objects "
4138 else if (declspecs->specs[(int)ds_const]
4139 || declspecs->specs[(int)ds_volatile]
4140 || declspecs->specs[(int)ds_restrict]
4141 || declspecs->specs[(int)ds_thread])
4142 error ("qualifiers can only be specified for objects "
4144 else if (saw_typedef)
4145 warning (0, "%<typedef%> was ignored in this declaration");
4146 else if (declspecs->specs[(int) ds_constexpr])
4147 error ("%<constexpr%> cannot be used for type declarations");
4150 return declared_type;
4153 /* Called when a declaration is seen that contains no names to declare.
4154 If its type is a reference to a structure, union or enum inherited
4155 from a containing scope, shadow that tag name for the current scope
4156 with a forward reference.
4157 If its type defines a new named structure or union
4158 or defines an enum, it is valid but we need not do anything here.
4159 Otherwise, it is an error.
4161 C++: may have to grok the declspecs to learn about static,
4162 complain for anonymous unions.
4164 Returns the TYPE declared -- or NULL_TREE if none. */
4167 shadow_tag (cp_decl_specifier_seq *declspecs)
4169 tree t = check_tag_decl (declspecs);
4174 if (declspecs->attributes)
4176 warning (0, "attribute ignored in declaration of %q+#T", t);
4177 warning (0, "attribute for %q+#T must follow the %qs keyword",
4178 t, class_key_or_enum_as_string (t));
4182 if (maybe_process_partial_specialization (t) == error_mark_node)
4185 /* This is where the variables in an anonymous union are
4186 declared. An anonymous union declaration looks like:
4188 because there is no declarator after the union, the parser
4189 sends that declaration here. */
4190 if (ANON_AGGR_TYPE_P (t))
4192 fixup_anonymous_aggr (t);
4194 if (TYPE_FIELDS (t))
4196 tree decl = grokdeclarator (/*declarator=*/NULL,
4197 declspecs, NORMAL, 0, NULL);
4198 finish_anon_union (decl);
4205 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4208 groktypename (cp_decl_specifier_seq *type_specifiers,
4209 const cp_declarator *declarator,
4210 bool is_template_arg)
4214 enum decl_context context
4215 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4216 attrs = type_specifiers->attributes;
4217 type_specifiers->attributes = NULL_TREE;
4218 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4219 if (attrs && type != error_mark_node)
4221 if (CLASS_TYPE_P (type))
4222 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4223 "outside of definition", type);
4224 else if (MAYBE_CLASS_TYPE_P (type))
4225 /* A template type parameter or other dependent type. */
4226 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4227 "type %qT without an associated declaration", type);
4229 cplus_decl_attributes (&type, attrs, 0);
4234 /* Process a DECLARATOR for a function-scope variable declaration,
4235 namespace-scope variable declaration, or function declaration.
4236 (Function definitions go through start_function; class member
4237 declarations appearing in the body of the class go through
4238 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4239 If an error occurs, the error_mark_node is returned instead.
4241 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4242 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4243 for an explicitly defaulted function, or SD_DELETED for an explicitly
4244 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4245 implicitly initialized via a default constructor. ATTRIBUTES and
4246 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4247 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4248 set, the caller is responsible for calling pop_scope. */
4251 start_decl (const cp_declarator *declarator,
4252 cp_decl_specifier_seq *declspecs,
4255 tree prefix_attributes,
4256 tree *pushed_scope_p)
4264 *pushed_scope_p = NULL_TREE;
4266 /* An object declared as __attribute__((deprecated)) suppresses
4267 warnings of uses of other deprecated items. */
4268 if (lookup_attribute ("deprecated", attributes))
4269 deprecated_state = DEPRECATED_SUPPRESS;
4271 attributes = chainon (attributes, prefix_attributes);
4273 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4276 deprecated_state = DEPRECATED_NORMAL;
4278 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4279 || decl == error_mark_node)
4280 return error_mark_node;
4282 context = CP_DECL_CONTEXT (decl);
4283 if (context != global_namespace)
4284 *pushed_scope_p = push_scope (context);
4287 /* Is it valid for this decl to have an initializer at all?
4288 If not, set INITIALIZED to zero, which will indirectly
4289 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4290 switch (TREE_CODE (decl))
4293 error ("typedef %qD is initialized (use decltype instead)", decl);
4294 return error_mark_node;
4297 if (initialized == SD_DELETED)
4298 /* We'll handle the rest of the semantics later, but we need to
4299 set this now so it's visible to duplicate_decls. */
4300 DECL_DELETED_FN (decl) = 1;
4309 if (! toplevel_bindings_p ()
4310 && DECL_EXTERNAL (decl))
4311 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4313 DECL_EXTERNAL (decl) = 0;
4314 if (toplevel_bindings_p ())
4315 TREE_STATIC (decl) = 1;
4317 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4319 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4320 record_key_method_defined (decl);
4322 /* If this is a typedef that names the class for linkage purposes
4323 (7.1.3p8), apply any attributes directly to the type. */
4324 if (TREE_CODE (decl) == TYPE_DECL
4325 && TAGGED_TYPE_P (TREE_TYPE (decl))
4326 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4327 flags = ATTR_FLAG_TYPE_IN_PLACE;
4331 /* Set attributes here so if duplicate decl, will have proper attributes. */
4332 cplus_decl_attributes (&decl, attributes, flags);
4334 /* Dllimported symbols cannot be defined. Static data members (which
4335 can be initialized in-class and dllimported) go through grokfield,
4336 not here, so we don't need to exclude those decls when checking for
4338 if (initialized && DECL_DLLIMPORT_P (decl))
4340 error ("definition of %q#D is marked %<dllimport%>", decl);
4341 DECL_DLLIMPORT_P (decl) = 0;
4344 /* If #pragma weak was used, mark the decl weak now. */
4345 maybe_apply_pragma_weak (decl);
4347 if (TREE_CODE (decl) == FUNCTION_DECL
4348 && DECL_DECLARED_INLINE_P (decl)
4349 && DECL_UNINLINABLE (decl)
4350 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4351 warning (0, "inline function %q+D given attribute noinline", decl);
4353 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4355 if (TREE_CODE (decl) == VAR_DECL)
4357 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4358 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4359 error ("%q#D is not a static member of %q#T", decl, context);
4362 if (DECL_CONTEXT (field) != context)
4364 if (!same_type_p (DECL_CONTEXT (field), context))
4365 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4366 "to be defined as %<%T::%D%>",
4367 DECL_CONTEXT (field), DECL_NAME (decl),
4368 context, DECL_NAME (decl));
4369 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4371 if (processing_specialization
4372 && template_class_depth (context) == 0
4373 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4374 error ("template header not allowed in member definition "
4375 "of explicitly specialized class");
4376 /* Static data member are tricky; an in-class initialization
4377 still doesn't provide a definition, so the in-class
4378 declaration will have DECL_EXTERNAL set, but will have an
4379 initialization. Thus, duplicate_decls won't warn
4380 about this situation, and so we check here. */
4381 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4382 error ("duplicate initialization of %qD", decl);
4383 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4385 if (declspecs->specs[(int) ds_constexpr]
4386 && !DECL_DECLARED_CONSTEXPR_P (field))
4387 error ("%qD declared %<constexpr%> outside its class", field);
4392 tree field = check_classfn (context, decl,
4393 (processing_template_decl
4394 > template_class_depth (context))
4395 ? current_template_parms
4397 if (field && field != error_mark_node
4398 && duplicate_decls (decl, field,
4399 /*newdecl_is_friend=*/false))
4403 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4404 DECL_IN_AGGR_P (decl) = 0;
4405 /* Do not mark DECL as an explicit specialization if it was not
4406 already marked as an instantiation; a declaration should
4407 never be marked as a specialization unless we know what
4408 template is being specialized. */
4409 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4411 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4413 /* [temp.expl.spec] An explicit specialization of a static data
4414 member of a template is a definition if the declaration
4415 includes an initializer; otherwise, it is a declaration.
4417 We check for processing_specialization so this only applies
4418 to the new specialization syntax. */
4419 if (!initialized && processing_specialization)
4420 DECL_EXTERNAL (decl) = 1;
4423 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4424 /* Aliases are definitions. */
4426 permerror (input_location, "declaration of %q#D outside of class is not definition",
4430 was_public = TREE_PUBLIC (decl);
4432 /* Enter this declaration into the symbol table. */
4433 decl = maybe_push_decl (decl);
4435 if (processing_template_decl)
4436 decl = push_template_decl (decl);
4437 if (decl == error_mark_node)
4438 return error_mark_node;
4440 /* Tell the back end to use or not use .common as appropriate. If we say
4441 -fconserve-space, we want this to save .data space, at the expense of
4442 wrong semantics. If we say -fno-conserve-space, we want this to
4443 produce errors about redefs; to do this we force variables into the
4445 if (flag_conserve_space
4446 && TREE_CODE (decl) == VAR_DECL
4447 && TREE_PUBLIC (decl)
4448 && !DECL_THREAD_LOCAL_P (decl)
4449 && !have_global_bss_p ())
4450 DECL_COMMON (decl) = 1;
4452 if (TREE_CODE (decl) == VAR_DECL
4453 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4454 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4456 /* This is a const variable with implicit 'static'. Set
4457 DECL_THIS_STATIC so we can tell it from variables that are
4458 !TREE_PUBLIC because of the anonymous namespace. */
4459 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4460 DECL_THIS_STATIC (decl) = 1;
4463 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4464 start_decl_1 (decl, initialized);
4469 /* Process the declaration of a variable DECL. INITIALIZED is true
4470 iff DECL is explicitly initialized. (INITIALIZED is false if the
4471 variable is initialized via an implicitly-called constructor.)
4472 This function must be called for ordinary variables (including, for
4473 example, implicit instantiations of templates), but must not be
4474 called for template declarations. */
4477 start_decl_1 (tree decl, bool initialized)
4481 bool aggregate_definition_p;
4483 gcc_assert (!processing_template_decl);
4485 if (error_operand_p (decl))
4488 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4490 type = TREE_TYPE (decl);
4491 complete_p = COMPLETE_TYPE_P (type);
4492 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4494 /* If an explicit initializer is present, or if this is a definition
4495 of an aggregate, then we need a complete type at this point.
4496 (Scalars are always complete types, so there is nothing to
4497 check.) This code just sets COMPLETE_P; errors (if necessary)
4498 are issued below. */
4499 if ((initialized || aggregate_definition_p)
4501 && COMPLETE_TYPE_P (complete_type (type)))
4504 /* We will not yet have set TREE_READONLY on DECL if the type
4505 was "const", but incomplete, before this point. But, now, we
4506 have a complete type, so we can try again. */
4507 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4511 /* Is it valid for this decl to have an initializer at all? */
4513 /* Don't allow initializations for incomplete types except for
4514 arrays which might be completed by the initialization. */
4516 ; /* A complete type is ok. */
4517 else if (type_uses_auto (type))
4518 ; /* An auto type is ok. */
4519 else if (TREE_CODE (type) != ARRAY_TYPE)
4521 error ("variable %q#D has initializer but incomplete type", decl);
4522 type = TREE_TYPE (decl) = error_mark_node;
4524 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4526 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4527 error ("elements of array %q#D have incomplete type", decl);
4528 /* else we already gave an error in start_decl. */
4531 else if (aggregate_definition_p && !complete_p)
4533 if (type_uses_auto (type))
4534 error ("declaration of %q#D has no initializer", decl);
4536 error ("aggregate %q#D has incomplete type and cannot be defined",
4538 /* Change the type so that assemble_variable will give
4539 DECL an rtl we can live with: (mem (const_int 0)). */
4540 type = TREE_TYPE (decl) = error_mark_node;
4543 /* Create a new scope to hold this declaration if necessary.
4544 Whether or not a new scope is necessary cannot be determined
4545 until after the type has been completed; if the type is a
4546 specialization of a class template it is not until after
4547 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4548 will be set correctly. */
4549 maybe_push_cleanup_level (type);
4552 /* Handle initialization of references. DECL, TYPE, and INIT have the
4553 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4554 but will be set to a new CLEANUP_STMT if a temporary is created
4555 that must be destroyed subsequently.
4557 Returns an initializer expression to use to initialize DECL, or
4558 NULL if the initialization can be performed statically.
4560 Quotes on semantics can be found in ARM 8.4.3. */
4563 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4567 if (init == NULL_TREE)
4569 if ((DECL_LANG_SPECIFIC (decl) == 0
4570 || DECL_IN_AGGR_P (decl) == 0)
4571 && ! DECL_THIS_EXTERN (decl))
4572 error ("%qD declared as reference but not initialized", decl);
4576 if (TREE_CODE (init) == TREE_LIST)
4577 init = build_x_compound_expr_from_list (init, ELK_INIT,
4578 tf_warning_or_error);
4580 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4581 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4582 /* Note: default conversion is only called in very special cases. */
4583 init = decay_conversion (init);
4585 /* Convert INIT to the reference type TYPE. This may involve the
4586 creation of a temporary, whose lifetime must be the same as that
4587 of the reference. If so, a DECL_EXPR for the temporary will be
4588 added just after the DECL_EXPR for DECL. That's why we don't set
4589 DECL_INITIAL for local references (instead assigning to them
4590 explicitly); we need to allow the temporary to be initialized
4592 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4594 if (tmp == error_mark_node)
4596 else if (tmp == NULL_TREE)
4598 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4602 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4605 DECL_INITIAL (decl) = tmp;
4610 /* Subroutine of check_initializer. We're initializing a DECL of
4611 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4612 extend the lifetime of the underlying array to match that of the decl,
4613 just like for reference initialization. CLEANUP is as for
4614 grok_reference_init. */
4617 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4620 tree aggr_init, array, arrtype;
4621 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4622 if (error_operand_p (init))
4623 return error_mark_node;
4625 aggr_init = TARGET_EXPR_INITIAL (init);
4626 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4627 arrtype = TREE_TYPE (array);
4629 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4630 array = TREE_OPERAND (array, 0);
4631 /* If the array is constant, finish_compound_literal already made it a
4632 static variable and we don't need to do anything here. */
4633 if (decl && TREE_CODE (array) == TARGET_EXPR)
4635 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4636 var = build_address (var);
4637 var = convert (arrtype, var);
4638 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4643 /* Designated initializers in arrays are not supported in GNU C++.
4644 The parser cannot detect this error since it does not know whether
4645 a given brace-enclosed initializer is for a class type or for an
4646 array. This function checks that CE does not use a designated
4647 initializer. If it does, an error is issued. Returns true if CE
4648 is valid, i.e., does not have a designated initializer. */
4651 check_array_designated_initializer (const constructor_elt *ce)
4653 /* Designated initializers for array elements are not supported. */
4656 /* The parser only allows identifiers as designated
4658 if (ce->index == error_mark_node)
4659 error ("name used in a GNU-style designated "
4660 "initializer for an array");
4661 else if (TREE_CODE (ce->index) == INTEGER_CST)
4662 /* An index added by reshape_init. */
4666 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4667 error ("name %qD used in a GNU-style designated "
4668 "initializer for an array", ce->index);
4676 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4677 array until we finish parsing the initializer. If that's the
4678 situation we're in, update DECL accordingly. */
4681 maybe_deduce_size_from_array_init (tree decl, tree init)
4683 tree type = TREE_TYPE (decl);
4685 if (TREE_CODE (type) == ARRAY_TYPE
4686 && TYPE_DOMAIN (type) == NULL_TREE
4687 && TREE_CODE (decl) != TYPE_DECL)
4689 /* do_default is really a C-ism to deal with tentative definitions.
4690 But let's leave it here to ease the eventual merge. */
4691 int do_default = !DECL_EXTERNAL (decl);
4692 tree initializer = init ? init : DECL_INITIAL (decl);
4695 /* Check that there are no designated initializers in INIT, as
4696 those are not supported in GNU C++, and as the middle-end
4697 will crash if presented with a non-numeric designated
4699 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4701 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4702 constructor_elt *ce;
4704 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4705 if (!check_array_designated_initializer (ce))
4711 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4715 error ("initializer fails to determine size of %qD", decl);
4716 TREE_TYPE (decl) = error_mark_node;
4718 else if (failure == 2)
4722 error ("array size missing in %qD", decl);
4723 TREE_TYPE (decl) = error_mark_node;
4725 /* If a `static' var's size isn't known, make it extern as
4726 well as static, so it does not get allocated. If it's not
4727 `static', then don't mark it extern; finish_incomplete_decl
4728 will give it a default size and it will get allocated. */
4729 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4730 DECL_EXTERNAL (decl) = 1;
4732 else if (failure == 3)
4734 error ("zero-size array %qD", decl);
4735 TREE_TYPE (decl) = error_mark_node;
4739 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4741 relayout_decl (decl);
4745 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4746 any appropriate error messages regarding the layout. */
4749 layout_var_decl (tree decl)
4753 type = TREE_TYPE (decl);
4754 if (type == error_mark_node)
4757 /* If we haven't already layed out this declaration, do so now.
4758 Note that we must not call complete type for an external object
4759 because it's type might involve templates that we are not
4760 supposed to instantiate yet. (And it's perfectly valid to say
4761 `extern X x' for some incomplete type `X'.) */
4762 if (!DECL_EXTERNAL (decl))
4763 complete_type (type);
4764 if (!DECL_SIZE (decl)
4765 && TREE_TYPE (decl) != error_mark_node
4766 && (COMPLETE_TYPE_P (type)
4767 || (TREE_CODE (type) == ARRAY_TYPE
4768 && !TYPE_DOMAIN (type)
4769 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4770 layout_decl (decl, 0);
4772 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4774 /* An automatic variable with an incomplete type: that is an error.
4775 Don't talk about array types here, since we took care of that
4776 message in grokdeclarator. */
4777 error ("storage size of %qD isn%'t known", decl);
4778 TREE_TYPE (decl) = error_mark_node;
4781 /* Keep this code around in case we later want to control debug info
4782 based on whether a type is "used". (jason 1999-11-11) */
4784 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4785 /* Let debugger know it should output info for this type. */
4786 note_debug_info_needed (ttype);
4788 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4789 note_debug_info_needed (DECL_CONTEXT (decl));
4792 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4793 && DECL_SIZE (decl) != NULL_TREE
4794 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4796 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4797 constant_expression_warning (DECL_SIZE (decl));
4800 error ("storage size of %qD isn%'t constant", decl);
4801 TREE_TYPE (decl) = error_mark_node;
4806 /* If a local static variable is declared in an inline function, or if
4807 we have a weak definition, we must endeavor to create only one
4808 instance of the variable at link-time. */
4811 maybe_commonize_var (tree decl)
4813 /* Static data in a function with comdat linkage also has comdat
4815 if (TREE_STATIC (decl)
4816 /* Don't mess with __FUNCTION__. */
4817 && ! DECL_ARTIFICIAL (decl)
4818 && DECL_FUNCTION_SCOPE_P (decl)
4819 && vague_linkage_p (DECL_CONTEXT (decl)))
4823 /* With weak symbols, we simply make the variable COMDAT;
4824 that will cause copies in multiple translations units to
4826 comdat_linkage (decl);
4830 if (DECL_INITIAL (decl) == NULL_TREE
4831 || DECL_INITIAL (decl) == error_mark_node)
4833 /* Without weak symbols, we can use COMMON to merge
4834 uninitialized variables. */
4835 TREE_PUBLIC (decl) = 1;
4836 DECL_COMMON (decl) = 1;
4840 /* While for initialized variables, we must use internal
4841 linkage -- which means that multiple copies will not
4843 TREE_PUBLIC (decl) = 0;
4844 DECL_COMMON (decl) = 0;
4845 warning_at (input_location, 0,
4846 "sorry: semantics of inline function static "
4847 "data %q+#D are wrong (you%'ll wind up "
4848 "with multiple copies)", decl);
4849 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4850 " you can work around this by removing "
4855 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4856 /* Set it up again; we might have set DECL_INITIAL since the last
4858 comdat_linkage (decl);
4861 /* Issue an error message if DECL is an uninitialized const variable. */
4864 check_for_uninitialized_const_var (tree decl)
4866 tree type = strip_array_types (TREE_TYPE (decl));
4868 /* ``Unless explicitly declared extern, a const object does not have
4869 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4871 if (TREE_CODE (decl) == VAR_DECL
4872 && TREE_CODE (type) != REFERENCE_TYPE
4873 && CP_TYPE_CONST_P (type)
4874 && (!TYPE_NEEDS_CONSTRUCTING (type)
4875 || !type_has_user_provided_default_constructor (type))
4876 && !DECL_INITIAL (decl))
4878 permerror (DECL_SOURCE_LOCATION (decl),
4879 "uninitialized const %qD", decl);
4881 if (CLASS_TYPE_P (type)
4882 && !type_has_user_provided_default_constructor (type))
4884 tree defaulted_ctor;
4886 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4887 "%q#T has no user-provided default constructor", type);
4888 defaulted_ctor = in_class_defaulted_default_constructor (type);
4890 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4891 "constructor is not user-provided because it is "
4892 "explicitly defaulted in the class body");
4897 /* Structure holding the current initializer being processed by reshape_init.
4898 CUR is a pointer to the current element being processed, END is a pointer
4899 after the last element present in the initializer. */
4900 typedef struct reshape_iterator_t
4902 constructor_elt *cur;
4903 constructor_elt *end;
4906 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4908 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4909 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4910 initialized. If there are no more such fields, the return value
4914 next_initializable_field (tree field)
4917 && (TREE_CODE (field) != FIELD_DECL
4918 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4919 || DECL_ARTIFICIAL (field)))
4920 field = DECL_CHAIN (field);
4925 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4926 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4927 INTEGER_CST representing the size of the array minus one (the maximum index),
4928 or NULL_TREE if the array was declared without specifying the size. D is
4929 the iterator within the constructor. */
4932 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4933 tsubst_flags_t complain)
4936 bool sized_array_p = (max_index != NULL_TREE);
4937 unsigned HOST_WIDE_INT max_index_cst = 0;
4938 unsigned HOST_WIDE_INT index;
4940 /* The initializer for an array is always a CONSTRUCTOR. */
4941 new_init = build_constructor (init_list_type_node, NULL);
4945 /* Minus 1 is used for zero sized arrays. */
4946 if (integer_all_onesp (max_index))
4949 if (host_integerp (max_index, 1))
4950 max_index_cst = tree_low_cst (max_index, 1);
4951 /* sizetype is sign extended, not zero extended. */
4953 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4957 /* Loop until there are no more initializers. */
4959 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4964 check_array_designated_initializer (d->cur);
4965 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4967 if (elt_init == error_mark_node)
4968 return error_mark_node;
4969 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4970 size_int (index), elt_init);
4971 if (!TREE_CONSTANT (elt_init))
4972 TREE_CONSTANT (new_init) = false;
4978 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4979 Parameters are the same of reshape_init_r. */
4982 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
4984 tree max_index = NULL_TREE;
4986 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4988 if (TYPE_DOMAIN (type))
4989 max_index = array_type_nelts (type);
4991 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
4994 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4995 Parameters are the same of reshape_init_r. */
4998 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5000 tree max_index = NULL_TREE;
5002 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5004 if (COMPOUND_LITERAL_P (d->cur->value))
5006 tree value = d->cur->value;
5007 if (!same_type_p (TREE_TYPE (value), type))
5009 if (complain & tf_error)
5010 error ("invalid type %qT as initializer for a vector of type %qT",
5011 TREE_TYPE (d->cur->value), type);
5012 value = error_mark_node;
5018 /* For a vector, we initialize it as an array of the appropriate size. */
5019 if (TREE_CODE (type) == VECTOR_TYPE)
5020 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5022 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5025 /* Subroutine of reshape_init_r, processes the initializers for classes
5026 or union. Parameters are the same of reshape_init_r. */
5029 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5030 tsubst_flags_t complain)
5035 gcc_assert (CLASS_TYPE_P (type));
5037 /* The initializer for a class is always a CONSTRUCTOR. */
5038 new_init = build_constructor (init_list_type_node, NULL);
5039 field = next_initializable_field (TYPE_FIELDS (type));
5045 An initializer for an aggregate member that is an
5046 empty class shall have the form of an empty
5047 initializer-list {}. */
5048 if (!first_initializer_p)
5050 if (complain & tf_error)
5051 error ("initializer for %qT must be brace-enclosed", type);
5052 return error_mark_node;
5057 /* Loop through the initializable fields, gathering initializers. */
5058 while (d->cur != d->end)
5062 /* Handle designated initializers, as an extension. */
5065 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5067 if (!field || TREE_CODE (field) != FIELD_DECL)
5069 if (complain & tf_error)
5070 error ("%qT has no non-static data member named %qD", type,
5072 return error_mark_node;
5076 /* If we processed all the member of the class, we are done. */
5080 field_init = reshape_init_r (TREE_TYPE (field), d,
5081 /*first_initializer_p=*/false, complain);
5082 if (field_init == error_mark_node)
5083 return error_mark_node;
5085 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5089 When a union is initialized with a brace-enclosed
5090 initializer, the braces shall only contain an
5091 initializer for the first member of the union. */
5092 if (TREE_CODE (type) == UNION_TYPE)
5095 field = next_initializable_field (DECL_CHAIN (field));
5101 /* Subroutine of reshape_init, which processes a single initializer (part of
5102 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5103 iterator within the CONSTRUCTOR which points to the initializer to process.
5104 FIRST_INITIALIZER_P is true if this is the first initializer of the
5105 outermost CONSTRUCTOR node. */
5108 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5109 tsubst_flags_t complain)
5111 tree init = d->cur->value;
5113 if (error_operand_p (init))
5114 return error_mark_node;
5116 if (TREE_CODE (type) == COMPLEX_TYPE)
5118 /* A complex type can be initialized from one or two initializers,
5119 but braces are not elided. */
5121 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5123 if (CONSTRUCTOR_NELTS (init) > 2)
5125 if (complain & tf_error)
5126 error ("too many initializers for %qT", type);
5128 return error_mark_node;
5131 else if (first_initializer_p && d->cur != d->end)
5133 VEC(constructor_elt, gc) *v = 0;
5134 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5135 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5137 init = build_constructor (init_list_type_node, v);
5142 /* A non-aggregate type is always initialized with a single
5144 if (!CP_AGGREGATE_TYPE_P (type))
5146 /* It is invalid to initialize a non-aggregate type with a
5147 brace-enclosed initializer before C++0x.
5148 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5149 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5150 a CONSTRUCTOR (with a record type). */
5151 if (TREE_CODE (init) == CONSTRUCTOR
5152 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5154 if (SCALAR_TYPE_P (type))
5156 if (complain & tf_error)
5157 error ("braces around scalar initializer for type %qT", type);
5158 init = error_mark_node;
5161 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5170 All implicit type conversions (clause _conv_) are considered when
5171 initializing the aggregate member with an initializer from an
5172 initializer-list. If the initializer can initialize a member,
5173 the member is initialized. Otherwise, if the member is itself a
5174 non-empty subaggregate, brace elision is assumed and the
5175 initializer is considered for the initialization of the first
5176 member of the subaggregate. */
5177 if (TREE_CODE (init) != CONSTRUCTOR
5178 /* But don't try this for the first initializer, since that would be
5179 looking through the outermost braces; A a2 = { a1 }; is not a
5180 valid aggregate initialization. */
5181 && !first_initializer_p
5182 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5183 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5189 /* [dcl.init.string]
5191 A char array (whether plain char, signed char, or unsigned char)
5192 can be initialized by a string-literal (optionally enclosed in
5193 braces); a wchar_t array can be initialized by a wide
5194 string-literal (optionally enclosed in braces). */
5195 if (TREE_CODE (type) == ARRAY_TYPE
5196 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5198 tree str_init = init;
5200 /* Strip one level of braces if and only if they enclose a single
5201 element (as allowed by [dcl.init.string]). */
5202 if (!first_initializer_p
5203 && TREE_CODE (str_init) == CONSTRUCTOR
5204 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5206 str_init = VEC_index (constructor_elt,
5207 CONSTRUCTOR_ELTS (str_init), 0)->value;
5210 /* If it's a string literal, then it's the initializer for the array
5211 as a whole. Otherwise, continue with normal initialization for
5212 array types (one value per array element). */
5213 if (TREE_CODE (str_init) == STRING_CST)
5220 /* The following cases are about aggregates. If we are not within a full
5221 initializer already, and there is not a CONSTRUCTOR, it means that there
5222 is a missing set of braces (that is, we are processing the case for
5223 which reshape_init exists). */
5224 if (!first_initializer_p)
5226 if (TREE_CODE (init) == CONSTRUCTOR)
5228 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5229 /* There is no need to reshape pointer-to-member function
5230 initializers, as they are always constructed correctly
5231 by the front end. */
5233 else if (COMPOUND_LITERAL_P (init))
5234 /* For a nested compound literal, there is no need to reshape since
5235 brace elision is not allowed. Even if we decided to allow it,
5236 we should add a call to reshape_init in finish_compound_literal,
5237 before calling digest_init, so changing this code would still
5238 not be necessary. */
5239 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5243 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5244 return reshape_init (type, init, complain);
5248 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5252 /* Dispatch to specialized routines. */
5253 if (CLASS_TYPE_P (type))
5254 return reshape_init_class (type, d, first_initializer_p, complain);
5255 else if (TREE_CODE (type) == ARRAY_TYPE)
5256 return reshape_init_array (type, d, complain);
5257 else if (TREE_CODE (type) == VECTOR_TYPE)
5258 return reshape_init_vector (type, d, complain);
5263 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5264 brace-enclosed aggregate initializer.
5266 INIT is the CONSTRUCTOR containing the list of initializers describing
5267 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5268 It may not presently match the shape of the TYPE; for example:
5270 struct S { int a; int b; };
5271 struct S a[] = { 1, 2, 3, 4 };
5273 Here INIT will hold a VEC of four elements, rather than a
5274 VEC of two elements, each itself a VEC of two elements. This
5275 routine transforms INIT from the former form into the latter. The
5276 revised CONSTRUCTOR node is returned. */
5279 reshape_init (tree type, tree init, tsubst_flags_t complain)
5281 VEC(constructor_elt, gc) *v;
5285 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5287 v = CONSTRUCTOR_ELTS (init);
5289 /* An empty constructor does not need reshaping, and it is always a valid
5291 if (VEC_empty (constructor_elt, v))
5294 /* Recurse on this CONSTRUCTOR. */
5295 d.cur = VEC_index (constructor_elt, v, 0);
5296 d.end = d.cur + VEC_length (constructor_elt, v);
5298 new_init = reshape_init_r (type, &d, true, complain);
5299 if (new_init == error_mark_node)
5300 return error_mark_node;
5302 /* Make sure all the element of the constructor were used. Otherwise,
5303 issue an error about exceeding initializers. */
5306 if (complain & tf_error)
5307 error ("too many initializers for %qT", type);
5309 return error_mark_node;
5315 /* Verify array initializer. Returns true if errors have been reported. */
5318 check_array_initializer (tree decl, tree type, tree init)
5320 tree element_type = TREE_TYPE (type);
5322 /* The array type itself need not be complete, because the
5323 initializer may tell us how many elements are in the array.
5324 But, the elements of the array must be complete. */
5325 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5328 error ("elements of array %q#D have incomplete type", decl);
5330 error ("elements of array %q#T have incomplete type", type);
5333 /* It is not valid to initialize a VLA. */
5335 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5336 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5339 error ("variable-sized object %qD may not be initialized", decl);
5341 error ("variable-sized compound literal");
5347 /* Subroutine of check_initializer; args are passed down from that function.
5348 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5351 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5354 int saved_stmts_are_full_exprs_p = 0;
5355 if (building_stmt_tree ())
5357 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5358 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5360 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5361 if (building_stmt_tree ())
5362 current_stmt_tree ()->stmts_are_full_exprs_p =
5363 saved_stmts_are_full_exprs_p;
5367 /* Verify INIT (the initializer for DECL), and record the
5368 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5369 grok_reference_init.
5371 If the return value is non-NULL, it is an expression that must be
5372 evaluated dynamically to initialize DECL. */
5375 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5377 tree type = TREE_TYPE (decl);
5378 tree init_code = NULL;
5379 tree extra_init = NULL_TREE;
5382 /* Things that are going to be initialized need to have complete
5384 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5386 if (type == error_mark_node)
5387 /* We will have already complained. */
5390 if (TREE_CODE (type) == ARRAY_TYPE)
5392 if (check_array_initializer (decl, type, init))
5395 else if (!COMPLETE_TYPE_P (type))
5397 error ("%qD has incomplete type", decl);
5398 TREE_TYPE (decl) = error_mark_node;
5402 /* There is no way to make a variable-sized class type in GNU C++. */
5403 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5405 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5407 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5408 if (SCALAR_TYPE_P (type))
5412 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5413 init = build_zero_init (type, NULL_TREE, false);
5415 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5417 error ("scalar object %qD requires one element in initializer",
5419 TREE_TYPE (decl) = error_mark_node;
5425 if (TREE_CODE (decl) == CONST_DECL)
5427 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5429 DECL_INITIAL (decl) = init;
5431 gcc_assert (init != NULL_TREE);
5434 else if (!init && DECL_REALLY_EXTERN (decl))
5436 else if (TREE_CODE (type) == REFERENCE_TYPE)
5437 init = grok_reference_init (decl, type, init, cleanup);
5438 else if (init || type_build_ctor_call (type))
5441 check_for_uninitialized_const_var (decl);
5442 /* Do not reshape constructors of vectors (they don't need to be
5444 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5446 if (is_std_init_list (type))
5447 init = build_init_list_var_init (decl, type, init,
5448 &extra_init, cleanup);
5449 else if (TYPE_NON_AGGREGATE_CLASS (type))
5451 /* Don't reshape if the class has constructors. */
5452 if (cxx_dialect == cxx98)
5453 error ("in C++98 %qD must be initialized by constructor, "
5457 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5459 error ("opaque vector types cannot be initialized");
5460 init = error_mark_node;
5463 init = reshape_init (type, init, tf_warning_or_error);
5466 /* If DECL has an array type without a specific bound, deduce the
5467 array size from the initializer. */
5468 maybe_deduce_size_from_array_init (decl, init);
5469 type = TREE_TYPE (decl);
5470 if (type == error_mark_node)
5473 if (type_build_ctor_call (type)
5474 || (CLASS_TYPE_P (type)
5475 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5477 init_code = build_aggr_init_full_exprs (decl, init, flags);
5479 /* If this is a constexpr initializer, expand_default_init will
5480 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5481 case, pull the initializer back out and pass it down into
5482 store_init_value. */
5483 while (TREE_CODE (init_code) == EXPR_STMT
5484 || TREE_CODE (init_code) == CONVERT_EXPR)
5485 init_code = TREE_OPERAND (init_code, 0);
5486 if (TREE_CODE (init_code) == INIT_EXPR)
5488 init = TREE_OPERAND (init_code, 1);
5489 init_code = NULL_TREE;
5490 /* Don't call digest_init; it's unnecessary and will complain
5491 about aggregate initialization of non-aggregate classes. */
5492 flags |= LOOKUP_ALREADY_DIGESTED;
5494 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5496 /* Declared constexpr, but no suitable initializer; massage
5497 init appropriately so we can pass it into store_init_value
5499 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5500 init = finish_compound_literal (type, init,
5501 tf_warning_or_error);
5502 else if (CLASS_TYPE_P (type)
5503 && (!init || TREE_CODE (init) == TREE_LIST))
5505 init = build_functional_cast (type, init, tf_none);
5506 if (init != error_mark_node)
5507 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5509 init_code = NULL_TREE;
5515 if (init && TREE_CODE (init) != TREE_VEC)
5517 init_code = store_init_value (decl, init, flags);
5518 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5519 && DECL_INITIAL (decl)
5520 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5521 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5522 warning (0, "array %qD initialized by parenthesized string literal %qE",
5523 decl, DECL_INITIAL (decl));
5529 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5530 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5531 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5532 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5535 check_for_uninitialized_const_var (decl);
5538 if (init && init != error_mark_node)
5539 init_code = build2 (INIT_EXPR, type, decl, init);
5542 init_code = add_stmt_to_compound (extra_init, init_code);
5544 if (init_code && DECL_IN_AGGR_P (decl))
5546 static int explained = 0;
5548 if (cxx_dialect < cxx0x)
5549 error ("initializer invalid for static member with constructor");
5551 error ("non-constant in-class initialization invalid for static "
5552 "member %qD", decl);
5555 error ("(an out of class initialization is required)");
5563 /* If DECL is not a local variable, give it RTL. */
5566 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5568 int toplev = toplevel_bindings_p ();
5570 const char *filename;
5572 /* Set the DECL_ASSEMBLER_NAME for the object. */
5575 /* The `register' keyword, when used together with an
5576 asm-specification, indicates that the variable should be
5577 placed in a particular register. */
5578 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5580 set_user_assembler_name (decl, asmspec);
5581 DECL_HARD_REGISTER (decl) = 1;
5585 if (TREE_CODE (decl) == FUNCTION_DECL
5586 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5587 set_builtin_user_assembler_name (decl, asmspec);
5588 set_user_assembler_name (decl, asmspec);
5592 /* Handle non-variables up front. */
5593 if (TREE_CODE (decl) != VAR_DECL)
5595 rest_of_decl_compilation (decl, toplev, at_eof);
5599 /* If we see a class member here, it should be a static data
5601 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5603 gcc_assert (TREE_STATIC (decl));
5604 /* An in-class declaration of a static data member should be
5605 external; it is only a declaration, and not a definition. */
5606 if (init == NULL_TREE)
5607 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5610 /* We don't create any RTL for local variables. */
5611 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5614 /* We defer emission of local statics until the corresponding
5615 DECL_EXPR is expanded. */
5616 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5618 /* We try to defer namespace-scope static constants so that they are
5619 not emitted into the object file unnecessarily. */
5620 filename = input_filename;
5621 if (!DECL_VIRTUAL_P (decl)
5622 && TREE_READONLY (decl)
5623 && DECL_INITIAL (decl) != NULL_TREE
5624 && DECL_INITIAL (decl) != error_mark_node
5626 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5628 && !TREE_PUBLIC (decl))
5630 /* Fool with the linkage of static consts according to #pragma
5632 struct c_fileinfo *finfo = get_fileinfo (filename);
5633 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5635 TREE_PUBLIC (decl) = 1;
5636 DECL_EXTERNAL (decl) = finfo->interface_only;
5641 /* Likewise for template instantiations. */
5642 else if (DECL_LANG_SPECIFIC (decl)
5643 && DECL_IMPLICIT_INSTANTIATION (decl))
5646 /* If we're not deferring, go ahead and assemble the variable. */
5648 rest_of_decl_compilation (decl, toplev, at_eof);
5651 /* walk_tree helper for wrap_temporary_cleanups, below. */
5654 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5656 if (TYPE_P (*stmt_p))
5662 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5664 tree guard = (tree)data;
5665 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5667 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5668 /* Tell honor_protect_cleanup_actions to handle this as a separate
5670 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5672 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5678 /* We're initializing a local variable which has a cleanup GUARD. If there
5679 are any temporaries used in the initializer INIT of this variable, we
5680 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5681 variable will be cleaned up properly if one of them throws.
5683 Unfortunately, there's no way to express this properly in terms of
5684 nesting, as the regions for the temporaries overlap the region for the
5685 variable itself; if there are two temporaries, the variable needs to be
5686 the first thing destroyed if either of them throws. However, we only
5687 want to run the variable's cleanup if it actually got constructed. So
5688 we need to guard the temporary cleanups with the variable's cleanup if
5689 they are run on the normal path, but not if they are run on the
5690 exceptional path. We implement this by telling
5691 honor_protect_cleanup_actions to strip the variable cleanup from the
5692 exceptional path. */
5695 wrap_temporary_cleanups (tree init, tree guard)
5697 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5700 /* Generate code to initialize DECL (a local variable). */
5703 initialize_local_var (tree decl, tree init)
5705 tree type = TREE_TYPE (decl);
5709 gcc_assert (TREE_CODE (decl) == VAR_DECL
5710 || TREE_CODE (decl) == RESULT_DECL);
5711 gcc_assert (!TREE_STATIC (decl));
5713 if (DECL_SIZE (decl) == NULL_TREE)
5715 /* If we used it already as memory, it must stay in memory. */
5716 DECL_INITIAL (decl) = NULL_TREE;
5717 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5721 if (type == error_mark_node)
5724 /* Compute and store the initial value. */
5725 already_used = TREE_USED (decl) || TREE_USED (type);
5726 if (TREE_USED (type))
5727 DECL_READ_P (decl) = 1;
5729 /* Generate a cleanup, if necessary. */
5730 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5732 /* Perform the initialization. */
5735 if (TREE_CODE (init) == INIT_EXPR
5736 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5738 /* Stick simple initializers in DECL_INITIAL so that
5739 -Wno-init-self works (c++/34772). */
5740 gcc_assert (TREE_OPERAND (init, 0) == decl);
5741 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5745 int saved_stmts_are_full_exprs_p;
5747 /* If we're only initializing a single object, guard the
5748 destructors of any temporaries used in its initializer with
5749 its destructor. This isn't right for arrays because each
5750 element initialization is a full-expression. */
5751 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5752 wrap_temporary_cleanups (init, cleanup);
5754 gcc_assert (building_stmt_tree ());
5755 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5756 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5757 finish_expr_stmt (init);
5758 current_stmt_tree ()->stmts_are_full_exprs_p =
5759 saved_stmts_are_full_exprs_p;
5763 /* Set this to 0 so we can tell whether an aggregate which was
5764 initialized was ever used. Don't do this if it has a
5765 destructor, so we don't complain about the 'resource
5766 allocation is initialization' idiom. Now set
5767 attribute((unused)) on types so decls of that type will be
5768 marked used. (see TREE_USED, above.) */
5769 if (TYPE_NEEDS_CONSTRUCTING (type)
5771 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5772 && DECL_NAME (decl))
5773 TREE_USED (decl) = 0;
5774 else if (already_used)
5775 TREE_USED (decl) = 1;
5778 finish_decl_cleanup (decl, cleanup);
5781 /* DECL is a VAR_DECL for a compiler-generated variable with static
5782 storage duration (like a virtual table) whose initializer is a
5783 compile-time constant. Initialize the variable and provide it to the
5787 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5790 gcc_assert (DECL_ARTIFICIAL (decl));
5791 init = build_constructor (TREE_TYPE (decl), v);
5792 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5793 DECL_INITIAL (decl) = init;
5794 DECL_INITIALIZED_P (decl) = 1;
5795 determine_visibility (decl);
5796 layout_var_decl (decl);
5797 maybe_commonize_var (decl);
5798 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5801 /* INIT is the initializer for a variable, as represented by the
5802 parser. Returns true iff INIT is type-dependent. */
5805 type_dependent_init_p (tree init)
5807 if (TREE_CODE (init) == TREE_LIST)
5808 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5809 return any_type_dependent_elements_p (init);
5810 else if (TREE_CODE (init) == CONSTRUCTOR)
5811 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5813 VEC(constructor_elt, gc) *elts;
5817 elts = CONSTRUCTOR_ELTS (init);
5818 nelts = VEC_length (constructor_elt, elts);
5819 for (i = 0; i < nelts; ++i)
5820 if (type_dependent_init_p (VEC_index (constructor_elt,
5825 /* It must be a simple expression, e.g., int i = 3; */
5826 return type_dependent_expression_p (init);
5831 /* INIT is the initializer for a variable, as represented by the
5832 parser. Returns true iff INIT is value-dependent. */
5835 value_dependent_init_p (tree init)
5837 if (TREE_CODE (init) == TREE_LIST)
5838 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5839 return any_value_dependent_elements_p (init);
5840 else if (TREE_CODE (init) == CONSTRUCTOR)
5841 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5843 VEC(constructor_elt, gc) *elts;
5847 elts = CONSTRUCTOR_ELTS (init);
5848 nelts = VEC_length (constructor_elt, elts);
5849 for (i = 0; i < nelts; ++i)
5850 if (value_dependent_init_p (VEC_index (constructor_elt,
5855 /* It must be a simple expression, e.g., int i = 3; */
5856 return value_dependent_expression_p (init);
5861 /* Finish processing of a declaration;
5862 install its line number and initial value.
5863 If the length of an array type is not known before,
5864 it must be determined now, from the initial value, or it is an error.
5866 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5867 true, then INIT is an integral constant expression.
5869 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5870 if the (init) syntax was used. */
5873 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5874 tree asmspec_tree, int flags)
5878 const char *asmspec = NULL;
5879 int was_readonly = 0;
5880 bool var_definition_p = false;
5883 if (decl == error_mark_node)
5888 error ("assignment (not initialization) in declaration");
5892 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5893 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5894 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5896 type = TREE_TYPE (decl);
5897 if (type == error_mark_node)
5900 /* Assume no cleanup is required. */
5901 cleanup = NULL_TREE;
5903 /* If a name was specified, get the string. */
5904 if (global_scope_p (current_binding_level))
5905 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5906 if (asmspec_tree && asmspec_tree != error_mark_node)
5907 asmspec = TREE_STRING_POINTER (asmspec_tree);
5909 if (current_class_type
5910 && CP_DECL_CONTEXT (decl) == current_class_type
5911 && TYPE_BEING_DEFINED (current_class_type)
5912 && (DECL_INITIAL (decl) || init))
5913 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5915 auto_node = type_uses_auto (type);
5919 if (init == NULL_TREE)
5921 error ("declaration of %q#D has no initializer", decl);
5922 TREE_TYPE (decl) = error_mark_node;
5926 if (TREE_CODE (d_init) == TREE_LIST)
5927 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5928 tf_warning_or_error);
5929 d_init = resolve_nondeduced_context (d_init);
5930 if (describable_type (d_init))
5932 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5934 if (type == error_mark_node)
5939 if (!ensure_literal_type_for_constexpr_object (decl))
5940 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5942 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5945 if (init == ridpointers[(int)RID_DELETE])
5947 /* FIXME check this is 1st decl. */
5948 DECL_DELETED_FN (decl) = 1;
5949 DECL_DECLARED_INLINE_P (decl) = 1;
5950 DECL_INITIAL (decl) = error_mark_node;
5951 FOR_EACH_CLONE (clone, decl)
5953 DECL_DELETED_FN (clone) = 1;
5954 DECL_DECLARED_INLINE_P (clone) = 1;
5955 DECL_INITIAL (clone) = error_mark_node;
5959 else if (init == ridpointers[(int)RID_DEFAULT])
5961 if (defaultable_fn_check (decl))
5962 DECL_DEFAULTED_FN (decl) = 1;
5964 DECL_INITIAL (decl) = NULL_TREE;
5968 if (init && TREE_CODE (decl) == VAR_DECL)
5970 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5971 if (init_const_expr_p)
5973 /* Set these flags now for templates. We'll update the flags in
5974 store_init_value for instantiations. */
5975 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5976 if (decl_maybe_constant_var_p (decl))
5977 TREE_CONSTANT (decl) = 1;
5981 if (processing_template_decl)
5983 bool type_dependent_p;
5985 /* Add this declaration to the statement-tree. */
5986 if (at_function_scope_p ())
5987 add_decl_expr (decl);
5989 type_dependent_p = dependent_type_p (type);
5991 if (check_for_bare_parameter_packs (init))
5994 DECL_INITIAL (decl) = NULL_TREE;
5997 /* Generally, initializers in templates are expanded when the
5998 template is instantiated. But, if DECL is a variable constant
5999 then it can be used in future constant expressions, so its value
6000 must be available. */
6002 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6003 /* We can't do anything if the decl has dependent type. */;
6005 && init_const_expr_p
6006 && !type_dependent_p
6007 && decl_maybe_constant_var_p (decl)
6008 && !type_dependent_init_p (init)
6009 && !value_dependent_init_p (init))
6011 /* This variable seems to be a non-dependent constant, so process
6012 its initializer. If check_initializer returns non-null the
6013 initialization wasn't constant after all. */
6014 tree init_code = check_initializer (decl, init, flags, &cleanup);
6015 if (init_code == NULL_TREE)
6018 else if (!DECL_PRETTY_FUNCTION_P (decl))
6019 /* Deduce array size even if the initializer is dependent. */
6020 maybe_deduce_size_from_array_init (decl, init);
6023 DECL_INITIAL (decl) = init;
6027 /* Take care of TYPE_DECLs up front. */
6028 if (TREE_CODE (decl) == TYPE_DECL)
6030 if (type != error_mark_node
6031 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6033 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6034 warning (0, "shadowing previous type declaration of %q#D", decl);
6035 set_identifier_type_value (DECL_NAME (decl), decl);
6038 /* If we have installed this as the canonical typedef for this
6039 type, and that type has not been defined yet, delay emitting
6040 the debug information for it, as we will emit it later. */
6041 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6042 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6043 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6045 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6050 /* A reference will be modified here, as it is initialized. */
6051 if (! DECL_EXTERNAL (decl)
6052 && TREE_READONLY (decl)
6053 && TREE_CODE (type) == REFERENCE_TYPE)
6056 TREE_READONLY (decl) = 0;
6059 if (TREE_CODE (decl) == VAR_DECL)
6061 /* Only variables with trivial initialization and destruction can
6062 have thread-local storage. */
6063 if (DECL_THREAD_LOCAL_P (decl)
6064 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6065 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6066 error ("%qD cannot be thread-local because it has non-trivial "
6067 "type %qT", decl, TREE_TYPE (decl));
6068 /* If this is a local variable that will need a mangled name,
6069 register it now. We must do this before processing the
6070 initializer for the variable, since the initialization might
6071 require a guard variable, and since the mangled name of the
6072 guard variable will depend on the mangled name of this
6074 if (DECL_FUNCTION_SCOPE_P (decl)
6075 && TREE_STATIC (decl)
6076 && !DECL_ARTIFICIAL (decl))
6078 push_local_name (decl);
6079 if (DECL_CONSTRUCTOR_P (current_function_decl)
6080 || DECL_DESTRUCTOR_P (current_function_decl))
6081 /* Normally local_decls is populated during GIMPLE lowering,
6082 but [cd]tors are never actually compiled directly. We need
6083 to put statics on the list so we can deal with the label
6084 address extension. */
6085 add_local_decl (cfun, decl);
6088 /* Convert the initializer to the type of DECL, if we have not
6089 already initialized DECL. */
6090 if (!DECL_INITIALIZED_P (decl)
6091 /* If !DECL_EXTERNAL then DECL is being defined. In the
6092 case of a static data member initialized inside the
6093 class-specifier, there can be an initializer even if DECL
6094 is *not* defined. */
6095 && (!DECL_EXTERNAL (decl) || init))
6097 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6100 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6101 /* Allow libjava/prims.cc define primitive classes. */
6102 if (init != NULL_TREE
6103 || jclass == NULL_TREE
6104 || TREE_CODE (jclass) != TYPE_DECL
6105 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6106 || !same_type_ignoring_top_level_qualifiers_p
6107 (type, TREE_TYPE (TREE_TYPE (jclass))))
6108 error ("Java object %qD not allocated with %<new%>", decl);
6111 init = check_initializer (decl, init, flags, &cleanup);
6112 /* Thread-local storage cannot be dynamically initialized. */
6113 if (DECL_THREAD_LOCAL_P (decl) && init)
6115 error ("%qD is thread-local and so cannot be dynamically "
6116 "initialized", decl);
6120 /* Check that the initializer for a static data member was a
6121 constant. Although we check in the parser that the
6122 initializer is an integral constant expression, we do not
6123 simplify division-by-zero at the point at which it
6124 occurs. Therefore, in:
6126 struct S { static const int i = 7 / 0; };
6128 we issue an error at this point. It would
6129 probably be better to forbid division by zero in
6130 integral constant expressions. */
6131 if (DECL_EXTERNAL (decl) && init)
6133 error ("%qD cannot be initialized by a non-constant expression"
6134 " when being declared", decl);
6135 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6143 The memory occupied by any object of static storage
6144 duration is zero-initialized at program startup before
6145 any other initialization takes place.
6147 We cannot create an appropriate initializer until after
6148 the type of DECL is finalized. If DECL_INITIAL is set,
6149 then the DECL is statically initialized, and any
6150 necessary zero-initialization has already been performed. */
6151 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6152 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6153 /*nelts=*/NULL_TREE,
6154 /*static_storage_p=*/true);
6155 /* Remember that the initialization for this variable has
6157 DECL_INITIALIZED_P (decl) = 1;
6158 /* This declaration is the definition of this variable,
6159 unless we are initializing a static data member within
6160 the class specifier. */
6161 if (!DECL_EXTERNAL (decl))
6162 var_definition_p = true;
6164 /* If the variable has an array type, lay out the type, even if
6165 there is no initializer. It is valid to index through the
6166 array, and we must get TYPE_ALIGN set correctly on the array
6168 else if (TREE_CODE (type) == ARRAY_TYPE)
6171 if (TREE_STATIC (decl)
6172 && !at_function_scope_p ()
6173 && current_function_decl == NULL)
6174 /* So decl is a global variable or a static member of a
6175 non local class. Record the types it uses
6176 so that we can decide later to emit debug info for them. */
6177 record_types_used_by_current_var_decl (decl);
6179 else if (TREE_CODE (decl) == FIELD_DECL
6180 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6181 error ("non-static data member %qD has Java class type", decl);
6183 /* Add this declaration to the statement-tree. This needs to happen
6184 after the call to check_initializer so that the DECL_EXPR for a
6185 reference temp is added before the DECL_EXPR for the reference itself. */
6186 if (at_function_scope_p ())
6187 add_decl_expr (decl);
6189 /* Let the middle end know about variables and functions -- but not
6190 static data members in uninstantiated class templates. */
6191 if (TREE_CODE (decl) == VAR_DECL
6192 || TREE_CODE (decl) == FUNCTION_DECL)
6194 if (TREE_CODE (decl) == VAR_DECL)
6196 layout_var_decl (decl);
6197 maybe_commonize_var (decl);
6200 /* This needs to happen after the linkage is set. */
6201 determine_visibility (decl);
6203 if (var_definition_p && TREE_STATIC (decl))
6205 /* If a TREE_READONLY variable needs initialization
6206 at runtime, it is no longer readonly and we need to
6207 avoid MEM_READONLY_P being set on RTL created for it. */
6210 if (TREE_READONLY (decl))
6211 TREE_READONLY (decl) = 0;
6214 else if (was_readonly)
6215 TREE_READONLY (decl) = 1;
6218 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6220 /* Check for abstractness of the type. Notice that there is no
6221 need to strip array types here since the check for those types
6222 is already done within create_array_type_for_decl. */
6223 if (TREE_CODE (type) == FUNCTION_TYPE
6224 || TREE_CODE (type) == METHOD_TYPE)
6225 abstract_virtuals_error (decl, TREE_TYPE (type));
6227 abstract_virtuals_error (decl, type);
6229 if (TREE_TYPE (decl) == error_mark_node)
6230 /* No initialization required. */
6232 else if (TREE_CODE (decl) == FUNCTION_DECL)
6236 if (init == ridpointers[(int)RID_DEFAULT])
6238 /* An out-of-class default definition is defined at
6239 the point where it is explicitly defaulted. */
6240 if (DECL_DELETED_FN (decl))
6241 maybe_explain_implicit_delete (decl);
6242 else if (DECL_INITIAL (decl) == error_mark_node)
6243 synthesize_method (decl);
6246 error ("function %q#D is initialized like a variable", decl);
6248 /* else no initialization required. */
6250 else if (DECL_EXTERNAL (decl)
6251 && ! (DECL_LANG_SPECIFIC (decl)
6252 && DECL_NOT_REALLY_EXTERN (decl)))
6255 DECL_INITIAL (decl) = init;
6257 /* A variable definition. */
6258 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6259 /* Initialize the local variable. */
6260 initialize_local_var (decl, init);
6262 /* If a variable is defined, and then a subsequent
6263 definition with external linkage is encountered, we will
6264 get here twice for the same variable. We want to avoid
6265 calling expand_static_init more than once. For variables
6266 that are not static data members, we can call
6267 expand_static_init only when we actually process the
6268 initializer. It is not legal to redeclare a static data
6269 member, so this issue does not arise in that case. */
6270 else if (var_definition_p && TREE_STATIC (decl))
6271 expand_static_init (decl, init);
6274 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6275 reference, insert it in the statement-tree now. */
6277 push_cleanup (decl, cleanup, false);
6280 TREE_READONLY (decl) = 1;
6283 /* Returns a declaration for a VAR_DECL as if:
6285 extern "C" TYPE NAME;
6287 had been seen. Used to create compiler-generated global
6291 declare_global_var (tree name, tree type)
6295 push_to_top_level ();
6296 decl = build_decl (input_location, VAR_DECL, name, type);
6297 TREE_PUBLIC (decl) = 1;
6298 DECL_EXTERNAL (decl) = 1;
6299 DECL_ARTIFICIAL (decl) = 1;
6300 /* If the user has explicitly declared this variable (perhaps
6301 because the code we are compiling is part of a low-level runtime
6302 library), then it is possible that our declaration will be merged
6303 with theirs by pushdecl. */
6304 decl = pushdecl (decl);
6305 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6306 pop_from_top_level ();
6311 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6312 if "__cxa_atexit" is not being used) corresponding to the function
6313 to be called when the program exits. */
6316 get_atexit_fn_ptr_type (void)
6320 if (!atexit_fn_ptr_type_node)
6323 if (flag_use_cxa_atexit
6324 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6325 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6326 arg_type = ptr_type_node;
6328 /* The parameter to "atexit" is "void (*)(void)". */
6329 arg_type = NULL_TREE;
6331 fn_type = build_function_type_list (void_type_node,
6332 arg_type, NULL_TREE);
6333 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6336 return atexit_fn_ptr_type_node;
6339 /* Returns a pointer to the `atexit' function. Note that if
6340 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6341 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6344 get_atexit_node (void)
6350 bool use_aeabi_atexit;
6355 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6357 /* The declaration for `__cxa_atexit' is:
6359 int __cxa_atexit (void (*)(void *), void *, void *)
6361 We build up the argument types and then the function type
6363 tree argtype0, argtype1, argtype2;
6365 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6366 /* First, build the pointer-to-function type for the first
6368 fn_ptr_type = get_atexit_fn_ptr_type ();
6369 /* Then, build the rest of the argument types. */
6370 argtype2 = ptr_type_node;
6371 if (use_aeabi_atexit)
6373 argtype1 = fn_ptr_type;
6374 argtype0 = ptr_type_node;
6378 argtype1 = ptr_type_node;
6379 argtype0 = fn_ptr_type;
6381 /* And the final __cxa_atexit type. */
6382 fn_type = build_function_type_list (integer_type_node,
6383 argtype0, argtype1, argtype2,
6385 fn_ptr_type = build_pointer_type (fn_type);
6386 if (use_aeabi_atexit)
6387 name = "__aeabi_atexit";
6389 name = "__cxa_atexit";
6393 /* The declaration for `atexit' is:
6395 int atexit (void (*)());
6397 We build up the argument types and then the function type
6399 fn_ptr_type = get_atexit_fn_ptr_type ();
6400 /* Build the final atexit type. */
6401 fn_type = build_function_type_list (integer_type_node,
6402 fn_ptr_type, NULL_TREE);
6406 /* Now, build the function declaration. */
6407 push_lang_context (lang_name_c);
6408 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6409 mark_used (atexit_fndecl);
6410 pop_lang_context ();
6411 atexit_node = decay_conversion (atexit_fndecl);
6416 /* Returns the __dso_handle VAR_DECL. */
6419 get_dso_handle_node (void)
6421 if (dso_handle_node)
6422 return dso_handle_node;
6424 /* Declare the variable. */
6425 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6428 return dso_handle_node;
6431 /* Begin a new function with internal linkage whose job will be simply
6432 to destroy some particular variable. */
6434 static GTY(()) int start_cleanup_cnt;
6437 start_cleanup_fn (void)
6442 bool use_cxa_atexit = flag_use_cxa_atexit
6443 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6445 push_to_top_level ();
6447 /* No need to mangle this. */
6448 push_lang_context (lang_name_c);
6450 /* Build the name of the function. */
6451 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6452 /* Build the function declaration. */
6453 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6454 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6455 /* It's a function with internal linkage, generated by the
6457 TREE_PUBLIC (fndecl) = 0;
6458 DECL_ARTIFICIAL (fndecl) = 1;
6459 /* Make the function `inline' so that it is only emitted if it is
6460 actually needed. It is unlikely that it will be inlined, since
6461 it is only called via a function pointer, but we avoid unnecessary
6462 emissions this way. */
6463 DECL_DECLARED_INLINE_P (fndecl) = 1;
6464 DECL_INTERFACE_KNOWN (fndecl) = 1;
6465 /* Build the parameter. */
6470 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6471 DECL_CONTEXT (parmdecl) = fndecl;
6472 TREE_USED (parmdecl) = 1;
6473 DECL_READ_P (parmdecl) = 1;
6474 DECL_ARGUMENTS (fndecl) = parmdecl;
6478 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6480 pop_lang_context ();
6482 return current_function_decl;
6485 /* Finish the cleanup function begun by start_cleanup_fn. */
6488 end_cleanup_fn (void)
6490 expand_or_defer_fn (finish_function (0));
6492 pop_from_top_level ();
6495 /* Generate code to handle the destruction of DECL, an object with
6496 static storage duration. */
6499 register_dtor_fn (tree decl)
6506 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6508 type = TREE_TYPE (decl);
6509 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6510 return void_zero_node;
6512 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6513 a class object, we can just pass the destructor to
6514 "__cxa_atexit"; we don't have to build a temporary function to do
6516 use_dtor = (flag_use_cxa_atexit
6517 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6518 && CLASS_TYPE_P (type));
6523 /* Find the destructor. */
6524 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6525 gcc_assert (idx >= 0);
6526 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6527 /* Make sure it is accessible. */
6528 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6532 /* Call build_cleanup before we enter the anonymous function so
6533 that any access checks will be done relative to the current
6534 scope, rather than the scope of the anonymous function. */
6535 build_cleanup (decl);
6537 /* Now start the function. */
6538 cleanup = start_cleanup_fn ();
6540 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6541 to the original function, rather than the anonymous one. That
6542 will make the back end think that nested functions are in use,
6543 which causes confusion. */
6544 push_deferring_access_checks (dk_no_check);
6545 fcall = build_cleanup (decl);
6546 pop_deferring_access_checks ();
6548 /* Create the body of the anonymous function. */
6549 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6550 finish_expr_stmt (fcall);
6551 finish_compound_stmt (compound_stmt);
6555 /* Call atexit with the cleanup function. */
6556 mark_used (cleanup);
6557 cleanup = build_address (cleanup);
6558 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6564 /* We must convert CLEANUP to the type that "__cxa_atexit"
6566 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6567 /* "__cxa_atexit" will pass the address of DECL to the
6568 cleanup function. */
6570 addr = build_address (decl);
6571 /* The declared type of the parameter to "__cxa_atexit" is
6572 "void *". For plain "T*", we could just let the
6573 machinery in cp_build_function_call convert it -- but if the
6574 type is "cv-qualified T *", then we need to convert it
6575 before passing it in, to avoid spurious errors. */
6576 addr = build_nop (ptr_type_node, addr);
6579 /* Since the cleanup functions we build ignore the address
6580 they're given, there's no reason to pass the actual address
6581 in, and, in general, it's cheaper to pass NULL than any
6583 addr = null_pointer_node;
6584 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6585 tf_warning_or_error);
6586 if (targetm.cxx.use_aeabi_atexit ())
6599 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6600 arg0, arg1, arg2, NULL_TREE);
6603 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6604 is its initializer. Generate code to handle the construction
6605 and destruction of DECL. */
6608 expand_static_init (tree decl, tree init)
6610 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6611 gcc_assert (TREE_STATIC (decl));
6613 /* Some variables require no dynamic initialization. */
6615 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6618 if (DECL_FUNCTION_SCOPE_P (decl))
6620 /* Emit code to perform this initialization but once. */
6621 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6622 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6623 tree guard, guard_addr;
6624 tree acquire_fn, release_fn, abort_fn;
6627 /* Emit code to perform this initialization but once. This code
6630 static <type> guard;
6631 if (!guard.first_byte) {
6632 if (__cxa_guard_acquire (&guard)) {
6635 // Do initialization.
6636 flag = true; __cxa_guard_release (&guard);
6637 // Register variable for destruction at end of program.
6639 if (!flag) __cxa_guard_abort (&guard);
6643 Note that the `flag' variable is only set to 1 *after* the
6644 initialization is complete. This ensures that an exception,
6645 thrown during the construction, will cause the variable to
6646 reinitialized when we pass through this code again, as per:
6650 If the initialization exits by throwing an exception, the
6651 initialization is not complete, so it will be tried again
6652 the next time control enters the declaration.
6654 This process should be thread-safe, too; multiple threads
6655 should not be able to initialize the variable more than
6658 /* Create the guard variable. */
6659 guard = get_guard (decl);
6661 /* This optimization isn't safe on targets with relaxed memory
6662 consistency. On such targets we force synchronization in
6663 __cxa_guard_acquire. */
6664 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6666 /* Begin the conditional initialization. */
6667 if_stmt = begin_if_stmt ();
6668 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6669 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6672 if (flag_threadsafe_statics)
6674 guard_addr = build_address (guard);
6676 acquire_fn = get_identifier ("__cxa_guard_acquire");
6677 release_fn = get_identifier ("__cxa_guard_release");
6678 abort_fn = get_identifier ("__cxa_guard_abort");
6679 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6681 tree vfntype = build_function_type_list (void_type_node,
6682 TREE_TYPE (guard_addr),
6684 acquire_fn = push_library_fn
6685 (acquire_fn, build_function_type_list (integer_type_node,
6686 TREE_TYPE (guard_addr),
6689 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6690 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6694 release_fn = identifier_global_value (release_fn);
6695 abort_fn = identifier_global_value (abort_fn);
6698 inner_if_stmt = begin_if_stmt ();
6699 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6702 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6703 begin = get_target_expr (boolean_false_node);
6704 flag = TARGET_EXPR_SLOT (begin);
6706 TARGET_EXPR_CLEANUP (begin)
6707 = build3 (COND_EXPR, void_type_node, flag,
6709 build_call_n (abort_fn, 1, guard_addr));
6710 CLEANUP_EH_ONLY (begin) = 1;
6712 /* Do the initialization itself. */
6713 init = add_stmt_to_compound (begin, init);
6714 init = add_stmt_to_compound
6715 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6716 init = add_stmt_to_compound
6717 (init, build_call_n (release_fn, 1, guard_addr));
6720 init = add_stmt_to_compound (init, set_guard (guard));
6722 /* Use atexit to register a function for destroying this static
6724 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6726 finish_expr_stmt (init);
6728 if (flag_threadsafe_statics)
6730 finish_compound_stmt (inner_then_clause);
6731 finish_then_clause (inner_if_stmt);
6732 finish_if_stmt (inner_if_stmt);
6735 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6737 finish_compound_stmt (then_clause);
6738 finish_then_clause (if_stmt);
6739 finish_if_stmt (if_stmt);
6743 static_aggregates = tree_cons (init, decl, static_aggregates);
6747 /* Make TYPE a complete type based on INITIAL_VALUE.
6748 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6749 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6750 3 if the initializer list is empty (in pedantic mode). */
6753 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6756 tree type, elt_type;
6760 unsigned HOST_WIDE_INT i;
6763 /* An array of character type can be initialized from a
6764 brace-enclosed string constant.
6766 FIXME: this code is duplicated from reshape_init. Probably
6767 we should just call reshape_init here? */
6768 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6769 && TREE_CODE (initial_value) == CONSTRUCTOR
6770 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6772 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6773 tree value = VEC_index (constructor_elt, v, 0)->value;
6775 if (TREE_CODE (value) == STRING_CST
6776 && VEC_length (constructor_elt, v) == 1)
6777 initial_value = value;
6780 /* If any of the elements are parameter packs, we can't actually
6781 complete this type now because the array size is dependent. */
6782 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6784 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6787 if (PACK_EXPANSION_P (value))
6793 failure = complete_array_type (ptype, initial_value, do_default);
6795 /* We can create the array before the element type is complete, which
6796 means that we didn't have these two bits set in the original type
6797 either. In completing the type, we are expected to propagate these
6798 bits. See also complete_type which does the same thing for arrays
6801 if (TYPE_DOMAIN (type))
6803 elt_type = TREE_TYPE (type);
6804 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6805 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6806 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6812 /* As above, but either give an error or reject zero-size arrays, depending
6816 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6817 bool do_default, tsubst_flags_t complain)
6820 bool sfinae = !(complain & tf_error);
6821 /* In SFINAE context we can't be lenient about zero-size arrays. */
6824 failure = cp_complete_array_type (ptype, initial_value, do_default);
6830 /* Not an error. */;
6831 else if (failure == 1)
6832 error ("initializer fails to determine size of %qT", *ptype);
6833 else if (failure == 2)
6836 error ("array size missing in %qT", *ptype);
6838 else if (failure == 3)
6839 error ("zero-size array %qT", *ptype);
6840 *ptype = error_mark_node;
6845 /* Return zero if something is declared to be a member of type
6846 CTYPE when in the context of CUR_TYPE. STRING is the error
6847 message to print in that case. Otherwise, quietly return 1. */
6850 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6852 if (ctype && ctype != cur_type)
6854 if (flags == DTOR_FLAG)
6855 error ("destructor for alien class %qT cannot be a member", ctype);
6857 error ("constructor for alien class %qT cannot be a member", ctype);
6863 /* Subroutine of `grokdeclarator'. */
6865 /* Generate errors possibly applicable for a given set of specifiers.
6866 This is for ARM $7.1.2. */
6869 bad_specifiers (tree object,
6870 enum bad_spec_place type,
6881 error ("%qD declared as a %<virtual%> variable", object);
6883 error ("%qD declared as an %<inline%> variable", object);
6885 error ("%<const%> and %<volatile%> function specifiers on "
6886 "%qD invalid in variable declaration", object);
6890 error ("%qD declared as a %<virtual%> parameter", object);
6892 error ("%qD declared as an %<inline%> parameter", object);
6894 error ("%<const%> and %<volatile%> function specifiers on "
6895 "%qD invalid in parameter declaration", object);
6899 error ("%qD declared as a %<virtual%> type", object);
6901 error ("%qD declared as an %<inline%> type", object);
6903 error ("%<const%> and %<volatile%> function specifiers on "
6904 "%qD invalid in type declaration", object);
6908 error ("%qD declared as a %<virtual%> field", object);
6910 error ("%qD declared as an %<inline%> field", object);
6912 error ("%<const%> and %<volatile%> function specifiers on "
6913 "%qD invalid in field declaration", object);
6919 error ("%q+D declared as a friend", object);
6921 && (TREE_CODE (object) == TYPE_DECL
6922 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6923 && !TYPE_REFFN_P (TREE_TYPE (object))
6924 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6925 error ("%q+D declared with an exception specification", object);
6928 /* DECL is a member function or static data member and is presently
6929 being defined. Check that the definition is taking place in a
6933 check_class_member_definition_namespace (tree decl)
6935 /* These checks only apply to member functions and static data
6937 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6938 || TREE_CODE (decl) == VAR_DECL);
6939 /* We check for problems with specializations in pt.c in
6940 check_specialization_namespace, where we can issue better
6942 if (processing_specialization)
6944 /* There are no restrictions on the placement of
6945 explicit instantiations. */
6946 if (processing_explicit_instantiation)
6950 A member function definition that appears outside of the
6951 class definition shall appear in a namespace scope enclosing
6952 the class definition.
6956 The definition for a static data member shall appear in a
6957 namespace scope enclosing the member's class definition. */
6958 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6959 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6960 decl, DECL_CONTEXT (decl));
6963 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6964 METHOD_TYPE for a non-static member function; QUALS are the
6965 cv-qualifiers that apply to the function. */
6968 build_this_parm (tree type, cp_cv_quals quals)
6973 cp_cv_quals this_quals;
6975 this_type = type_of_this_parm (type);
6976 /* The `this' parameter is implicitly `const'; it cannot be
6978 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6979 qual_type = cp_build_qualified_type (this_type, this_quals);
6980 parm = build_artificial_parm (this_identifier, qual_type);
6981 cp_apply_type_quals_to_decl (this_quals, parm);
6985 /* DECL is a static member function. Complain if it was declared
6986 with function-cv-quals. */
6989 check_static_quals (tree decl, cp_cv_quals quals)
6991 if (quals != TYPE_UNQUALIFIED)
6992 error ("static member function %q#D declared with type qualifiers",
6996 /* CTYPE is class type, or null if non-class.
6997 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6999 DECLARATOR is the function's name.
7000 PARMS is a chain of PARM_DECLs for the function.
7001 VIRTUALP is truthvalue of whether the function is virtual or not.
7002 FLAGS are to be passed through to `grokclassfn'.
7003 QUALS are qualifiers indicating whether the function is `const'
7005 RAISES is a list of exceptions that this function can raise.
7006 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7007 not look, and -1 if we should not call `grokclassfn' at all.
7009 SFK is the kind of special function (if any) for the new function.
7011 Returns `NULL_TREE' if something goes wrong, after issuing
7012 applicable error messages. */
7015 grokfndecl (tree ctype,
7019 tree orig_declarator,
7021 enum overload_flags flags,
7028 special_function_kind sfk,
7033 location_t location)
7036 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7040 type = build_exception_variant (type, raises);
7042 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7044 /* If we have an explicit location, use it, otherwise use whatever
7045 build_lang_decl used (probably input_location). */
7046 if (location != UNKNOWN_LOCATION)
7047 DECL_SOURCE_LOCATION (decl) = location;
7049 if (TREE_CODE (type) == METHOD_TYPE)
7052 parm = build_this_parm (type, quals);
7053 DECL_CHAIN (parm) = parms;
7056 DECL_ARGUMENTS (decl) = parms;
7057 for (t = parms; t; t = DECL_CHAIN (t))
7058 DECL_CONTEXT (t) = decl;
7059 /* Propagate volatile out from type to decl. */
7060 if (TYPE_VOLATILE (type))
7061 TREE_THIS_VOLATILE (decl) = 1;
7063 /* Setup decl according to sfk. */
7066 case sfk_constructor:
7067 case sfk_copy_constructor:
7068 case sfk_move_constructor:
7069 DECL_CONSTRUCTOR_P (decl) = 1;
7071 case sfk_destructor:
7072 DECL_DESTRUCTOR_P (decl) = 1;
7078 /* If pointers to member functions use the least significant bit to
7079 indicate whether a function is virtual, ensure a pointer
7080 to this function will have that bit clear. */
7081 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7082 && TREE_CODE (type) == METHOD_TYPE
7083 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7084 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7087 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7091 ("defining explicit specialization %qD in friend declaration",
7095 tree fns = TREE_OPERAND (orig_declarator, 0);
7096 tree args = TREE_OPERAND (orig_declarator, 1);
7098 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7100 /* Something like `template <class T> friend void f<T>()'. */
7101 error ("invalid use of template-id %qD in declaration "
7102 "of primary template",
7108 /* A friend declaration of the form friend void f<>(). Record
7109 the information in the TEMPLATE_ID_EXPR. */
7110 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7112 if (TREE_CODE (fns) == COMPONENT_REF)
7114 /* Due to bison parser ickiness, we will have already looked
7115 up an operator_name or PFUNCNAME within the current class
7116 (see template_id in parse.y). If the current class contains
7117 such a name, we'll get a COMPONENT_REF here. Undo that. */
7119 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7120 == current_class_type);
7121 fns = TREE_OPERAND (fns, 1);
7123 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7124 || TREE_CODE (fns) == OVERLOAD);
7125 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7127 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7128 if (TREE_PURPOSE (t)
7129 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7131 error ("default arguments are not allowed in declaration "
7132 "of friend template specialization %qD",
7139 error ("%<inline%> is not allowed in declaration of friend "
7140 "template specialization %qD",
7147 /* If this decl has namespace scope, set that up. */
7149 set_decl_namespace (decl, in_namespace, friendp);
7151 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7153 /* `main' and builtins have implicit 'C' linkage. */
7154 if ((MAIN_NAME_P (declarator)
7155 || (IDENTIFIER_LENGTH (declarator) > 10
7156 && IDENTIFIER_POINTER (declarator)[0] == '_'
7157 && IDENTIFIER_POINTER (declarator)[1] == '_'
7158 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7159 && current_lang_name == lang_name_cplusplus
7160 && ctype == NULL_TREE
7161 && DECL_FILE_SCOPE_P (decl))
7162 SET_DECL_LANGUAGE (decl, lang_c);
7164 /* Should probably propagate const out from type to decl I bet (mrs). */
7167 DECL_STATIC_FUNCTION_P (decl) = 1;
7168 DECL_CONTEXT (decl) = ctype;
7173 DECL_CONTEXT (decl) = ctype;
7175 check_class_member_definition_namespace (decl);
7178 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7180 if (processing_template_decl)
7181 error ("cannot declare %<::main%> to be a template");
7183 error ("cannot declare %<::main%> to be inline");
7185 error ("cannot declare %<::main%> to be static");
7190 /* Members of anonymous types and local classes have no linkage; make
7191 them internal. If a typedef is made later, this will be changed. */
7192 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7193 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7196 if (publicp && cxx_dialect == cxx98)
7198 /* [basic.link]: A name with no linkage (notably, the name of a class
7199 or enumeration declared in a local scope) shall not be used to
7200 declare an entity with linkage.
7202 DR 757 relaxes this restriction for C++0x. */
7203 t = no_linkage_check (TREE_TYPE (decl),
7204 /*relaxed_p=*/false);
7207 if (TYPE_ANONYMOUS_P (t))
7209 if (DECL_EXTERN_C_P (decl))
7210 /* Allow this; it's pretty common in C. */;
7213 permerror (input_location, "anonymous type with no linkage "
7214 "used to declare function %q#D with linkage",
7216 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7217 permerror (input_location, "%q+#D does not refer to the unqualified "
7218 "type, so it is not used for linkage",
7223 permerror (input_location, "type %qT with no linkage used to "
7224 "declare function %q#D with linkage", t, decl);
7228 TREE_PUBLIC (decl) = publicp;
7231 DECL_INTERFACE_KNOWN (decl) = 1;
7232 DECL_NOT_REALLY_EXTERN (decl) = 1;
7235 /* If the declaration was declared inline, mark it as such. */
7237 DECL_DECLARED_INLINE_P (decl) = 1;
7239 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7241 DECL_EXTERNAL (decl) = 1;
7242 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7245 ? G_("static member function %qD cannot have cv-qualifier")
7246 : G_("non-member function %qD cannot have cv-qualifier"),
7248 quals = TYPE_UNQUALIFIED;
7251 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7252 && !grok_op_properties (decl, /*complain=*/true))
7256 /* Make the init_value nonzero so pushdecl knows this is not
7257 tentative. error_mark_node is replaced later with the BLOCK. */
7258 DECL_INITIAL (decl) = error_mark_node;
7260 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7261 TREE_NOTHROW (decl) = 1;
7263 /* Caller will do the rest of this. */
7267 if (ctype != NULL_TREE)
7268 grokclassfn (ctype, decl, flags);
7270 decl = check_explicit_specialization (orig_declarator, decl,
7273 4 * (friendp != 0));
7274 if (decl == error_mark_node)
7277 if (DECL_STATIC_FUNCTION_P (decl))
7278 check_static_quals (decl, quals);
7282 cplus_decl_attributes (&decl, *attrlist, 0);
7283 *attrlist = NULL_TREE;
7286 /* Check main's type after attributes have been applied. */
7287 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7289 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7292 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7294 error ("%<::main%> must return %<int%>");
7295 newtype = build_function_type (integer_type_node, oldtypeargs);
7296 TREE_TYPE (decl) = newtype;
7299 check_main_parameter_types (decl);
7302 if (ctype != NULL_TREE
7303 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7306 tree old_decl = check_classfn (ctype, decl,
7307 (processing_template_decl
7308 > template_class_depth (ctype))
7309 ? current_template_parms
7312 if (old_decl == error_mark_node)
7320 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7321 /* Because grokfndecl is always supposed to return a
7322 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7323 here. We depend on our callers to figure out that its
7324 really a template that's being returned. */
7325 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7327 if (DECL_STATIC_FUNCTION_P (old_decl)
7328 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7330 /* Remove the `this' parm added by grokclassfn. */
7331 revert_static_member_fn (decl);
7332 check_static_quals (decl, quals);
7334 if (DECL_ARTIFICIAL (old_decl))
7336 error ("definition of implicitly-declared %qD", old_decl);
7340 /* Since we've smashed OLD_DECL to its
7341 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7342 if (TREE_CODE (decl) == TEMPLATE_DECL)
7343 decl = DECL_TEMPLATE_RESULT (decl);
7345 /* Attempt to merge the declarations. This can fail, in
7346 the case of some invalid specialization declarations. */
7347 pushed_scope = push_scope (ctype);
7348 ok = duplicate_decls (decl, old_decl, friendp);
7350 pop_scope (pushed_scope);
7353 error ("no %q#D member function declared in class %qT",
7361 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7364 if (ctype == NULL_TREE || check)
7368 DECL_VIRTUAL_P (decl) = 1;
7373 /* decl is a FUNCTION_DECL.
7374 specifiers are the parsed virt-specifiers.
7376 Set flags to reflect the virt-specifiers.
7381 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7383 if (decl == NULL_TREE)
7385 if (specifiers & VIRT_SPEC_OVERRIDE)
7386 DECL_OVERRIDE_P (decl) = 1;
7387 if (specifiers & VIRT_SPEC_FINAL)
7388 DECL_FINAL_P (decl) = 1;
7392 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7393 the linkage that DECL will receive in the object file. */
7396 set_linkage_for_static_data_member (tree decl)
7398 /* A static data member always has static storage duration and
7399 external linkage. Note that static data members are forbidden in
7400 local classes -- the only situation in which a class has
7401 non-external linkage. */
7402 TREE_PUBLIC (decl) = 1;
7403 TREE_STATIC (decl) = 1;
7404 /* For non-template classes, static data members are always put
7405 out in exactly those files where they are defined, just as
7406 with ordinary namespace-scope variables. */
7407 if (!processing_template_decl)
7408 DECL_INTERFACE_KNOWN (decl) = 1;
7411 /* Create a VAR_DECL named NAME with the indicated TYPE.
7413 If SCOPE is non-NULL, it is the class type or namespace containing
7414 the variable. If SCOPE is NULL, the variable should is created in
7415 the innermost enclosings scope. */
7418 grokvardecl (tree type,
7420 const cp_decl_specifier_seq *declspecs,
7426 tree explicit_scope;
7428 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7430 /* Compute the scope in which to place the variable, but remember
7431 whether or not that scope was explicitly specified by the user. */
7432 explicit_scope = scope;
7435 /* An explicit "extern" specifier indicates a namespace-scope
7437 if (declspecs->storage_class == sc_extern)
7438 scope = current_decl_namespace ();
7439 else if (!at_function_scope_p ())
7440 scope = current_scope ();
7444 && (/* If the variable is a namespace-scope variable declared in a
7445 template, we need DECL_LANG_SPECIFIC. */
7446 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7447 /* Similarly for namespace-scope variables with language linkage
7449 || (TREE_CODE (scope) == NAMESPACE_DECL
7450 && current_lang_name != lang_name_cplusplus)
7451 /* Similarly for static data members. */
7453 decl = build_lang_decl (VAR_DECL, name, type);
7455 decl = build_decl (input_location, VAR_DECL, name, type);
7457 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7458 set_decl_namespace (decl, explicit_scope, 0);
7460 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7462 if (declspecs->storage_class == sc_extern)
7464 DECL_THIS_EXTERN (decl) = 1;
7465 DECL_EXTERNAL (decl) = !initialized;
7468 if (DECL_CLASS_SCOPE_P (decl))
7470 set_linkage_for_static_data_member (decl);
7471 /* This function is only called with out-of-class definitions. */
7472 DECL_EXTERNAL (decl) = 0;
7473 check_class_member_definition_namespace (decl);
7475 /* At top level, either `static' or no s.c. makes a definition
7476 (perhaps tentative), and absence of `static' makes it public. */
7477 else if (toplevel_bindings_p ())
7479 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7480 && (DECL_THIS_EXTERN (decl) || ! constp));
7481 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7483 /* Not at top level, only `static' makes a static definition. */
7486 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7487 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7490 if (declspecs->specs[(int)ds_thread])
7491 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7493 /* If the type of the decl has no linkage, make sure that we'll
7494 notice that in mark_used. */
7495 if (cxx_dialect > cxx98
7496 && decl_linkage (decl) != lk_none
7497 && DECL_LANG_SPECIFIC (decl) == NULL
7498 && !DECL_EXTERN_C_P (decl)
7499 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7500 retrofit_lang_decl (decl);
7502 if (TREE_PUBLIC (decl))
7504 /* [basic.link]: A name with no linkage (notably, the name of a class
7505 or enumeration declared in a local scope) shall not be used to
7506 declare an entity with linkage.
7508 DR 757 relaxes this restriction for C++0x. */
7509 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7510 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7513 if (TYPE_ANONYMOUS_P (t))
7515 if (DECL_EXTERN_C_P (decl))
7516 /* Allow this; it's pretty common in C. */
7520 /* DRs 132, 319 and 389 seem to indicate types with
7521 no linkage can only be used to declare extern "C"
7522 entities. Since it's not always an error in the
7523 ISO C++ 90 Standard, we only issue a warning. */
7524 warning (0, "anonymous type with no linkage used to declare "
7525 "variable %q#D with linkage", decl);
7526 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7527 warning (0, "%q+#D does not refer to the unqualified "
7528 "type, so it is not used for linkage",
7533 warning (0, "type %qT with no linkage used to declare variable "
7534 "%q#D with linkage", t, decl);
7538 DECL_INTERFACE_KNOWN (decl) = 1;
7543 /* Create and return a canonical pointer to member function type, for
7544 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7547 build_ptrmemfunc_type (tree type)
7551 tree unqualified_variant = NULL_TREE;
7553 if (type == error_mark_node)
7556 /* If a canonical type already exists for this type, use it. We use
7557 this method instead of type_hash_canon, because it only does a
7558 simple equality check on the list of field members. */
7560 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7563 /* Make sure that we always have the unqualified pointer-to-member
7565 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7567 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7569 t = make_class_type (RECORD_TYPE);
7570 xref_basetypes (t, NULL_TREE);
7572 /* Let the front end know this is a pointer to member function... */
7573 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7574 /* ... and not really a class type. */
7575 SET_CLASS_TYPE_P (t, 0);
7577 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7580 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7582 DECL_CHAIN (field) = fields;
7585 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7587 /* Zap out the name so that the back end will give us the debugging
7588 information for this anonymous RECORD_TYPE. */
7589 TYPE_NAME (t) = NULL_TREE;
7591 /* If this is not the unqualified form of this pointer-to-member
7592 type, set the TYPE_MAIN_VARIANT for this type to be the
7593 unqualified type. Since they are actually RECORD_TYPEs that are
7594 not variants of each other, we must do this manually.
7595 As we just built a new type there is no need to do yet another copy. */
7596 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7598 int type_quals = cp_type_quals (type);
7599 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7600 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7601 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7602 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7603 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7604 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7605 TREE_TYPE (TYPE_BINFO (t)) = t;
7608 /* Cache this pointer-to-member type so that we can find it again
7610 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7612 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7613 SET_TYPE_STRUCTURAL_EQUALITY (t);
7614 else if (TYPE_CANONICAL (type) != type)
7615 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7620 /* Create and return a pointer to data member type. */
7623 build_ptrmem_type (tree class_type, tree member_type)
7625 if (TREE_CODE (member_type) == METHOD_TYPE)
7627 cp_cv_quals quals = type_memfn_quals (member_type);
7628 member_type = build_memfn_type (member_type, class_type, quals);
7629 return build_ptrmemfunc_type (build_pointer_type (member_type));
7633 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7634 return build_offset_type (class_type, member_type);
7638 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7639 Check to see that the definition is valid. Issue appropriate error
7640 messages. Return 1 if the definition is particularly bad, or 0
7644 check_static_variable_definition (tree decl, tree type)
7646 /* If DECL is declared constexpr, we'll do the appropriate checks
7647 in check_initializer. */
7648 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7650 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7652 if (literal_type_p (type))
7653 error ("%<constexpr%> needed for in-class initialization of static "
7654 "data member %q#D of non-integral type", decl);
7656 error ("in-class initialization of static data member %q#D of "
7657 "non-literal type", decl);
7661 /* Motion 10 at San Diego: If a static const integral data member is
7662 initialized with an integral constant expression, the initializer
7663 may appear either in the declaration (within the class), or in
7664 the definition, but not both. If it appears in the class, the
7665 member is a member constant. The file-scope definition is always
7667 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7669 error ("invalid in-class initialization of static data member "
7670 "of non-integral type %qT",
7674 else if (!CP_TYPE_CONST_P (type))
7675 error ("ISO C++ forbids in-class initialization of non-const "
7676 "static member %qD",
7678 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7679 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7680 "%qD of non-integral type %qT", decl, type);
7685 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7686 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7687 expressions out into temporary variables so that walk_tree doesn't
7688 step into them (c++/15764). */
7691 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7693 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7694 tree expr = *expr_p;
7695 if (TREE_CODE (expr) == SAVE_EXPR)
7697 tree op = TREE_OPERAND (expr, 0);
7698 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7699 if (TREE_SIDE_EFFECTS (op))
7700 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7703 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7708 /* Entry point for the above. */
7711 stabilize_vla_size (tree size)
7713 struct pointer_set_t *pset = pointer_set_create ();
7714 /* Break out any function calls into temporary variables. */
7715 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7718 /* Given the SIZE (i.e., number of elements) in an array, compute an
7719 appropriate index type for the array. If non-NULL, NAME is the
7720 name of the thing being declared. */
7723 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7728 tree abi_1_itype = NULL_TREE;
7730 if (error_operand_p (size))
7731 return error_mark_node;
7733 type = TREE_TYPE (size);
7734 /* type_dependent_expression_p? */
7735 if (!dependent_type_p (type))
7737 mark_rvalue_use (size);
7739 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7740 && TREE_SIDE_EFFECTS (size))
7741 /* In C++98, we mark a non-constant array bound with a magic
7742 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7745 size = fold_non_dependent_expr (size);
7747 if (CLASS_TYPE_P (type)
7748 && CLASSTYPE_LITERAL_P (type))
7750 size = build_expr_type_conversion (WANT_INT, size, true);
7753 if (!(complain & tf_error))
7754 return error_mark_node;
7756 error ("size of array %qD has non-integral type %qT",
7759 error ("size of array has non-integral type %qT", type);
7760 size = integer_one_node;
7762 if (size == error_mark_node)
7763 return error_mark_node;
7764 type = TREE_TYPE (size);
7765 /* We didn't support this case in GCC 3.2, so don't bother
7766 trying to model it now in ABI v1. */
7767 abi_1_itype = error_mark_node;
7770 size = maybe_constant_value (size);
7771 if (!TREE_CONSTANT (size))
7775 if (error_operand_p (size))
7776 return error_mark_node;
7778 /* The array bound must be an integer type. */
7779 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7781 if (!(complain & tf_error))
7782 return error_mark_node;
7784 error ("size of array %qD has non-integral type %qT", name, type);
7786 error ("size of array has non-integral type %qT", type);
7787 size = integer_one_node;
7788 type = TREE_TYPE (size);
7792 /* A type is dependent if it is...an array type constructed from any
7793 dependent type or whose size is specified by a constant expression
7794 that is value-dependent. */
7795 /* We can only call value_dependent_expression_p on integral constant
7796 expressions; treat non-constant expressions as dependent, too. */
7797 if (processing_template_decl
7798 && (dependent_type_p (type)
7799 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7801 /* We cannot do any checking for a SIZE that isn't known to be
7802 constant. Just build the index type and mark that it requires
7803 structural equality checks. */
7804 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7805 size, integer_one_node));
7806 TYPE_DEPENDENT_P (itype) = 1;
7807 TYPE_DEPENDENT_P_VALID (itype) = 1;
7808 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7812 if (!abi_version_at_least (2) && processing_template_decl
7813 && abi_1_itype == NULL_TREE)
7814 /* For abi-1, we handled all instances in templates the same way,
7815 even when they were non-dependent. This affects the manglings
7816 produced. So, we do the normal checking for non-dependent
7817 sizes, but at the end we'll return the same type that abi-1
7818 would have, but with TYPE_CANONICAL set to the "right"
7819 value that the current ABI would provide. */
7820 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7821 osize, integer_one_node));
7823 /* Normally, the array-bound will be a constant. */
7824 if (TREE_CODE (size) == INTEGER_CST)
7826 /* Check to see if the array bound overflowed. Make that an
7827 error, no matter how generous we're being. */
7828 constant_expression_error (size);
7830 /* An array must have a positive number of elements. */
7831 if (INT_CST_LT (size, integer_zero_node))
7833 if (!(complain & tf_error))
7834 return error_mark_node;
7836 error ("size of array %qD is negative", name);
7838 error ("size of array is negative");
7839 size = integer_one_node;
7841 /* As an extension we allow zero-sized arrays. */
7842 else if (integer_zerop (size))
7844 if (!(complain & tf_error))
7845 /* We must fail if performing argument deduction (as
7846 indicated by the state of complain), so that
7847 another substitution can be found. */
7848 return error_mark_node;
7849 else if (in_system_header)
7850 /* Allow them in system headers because glibc uses them. */;
7852 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7854 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7857 else if (TREE_CONSTANT (size)
7858 /* We don't allow VLAs at non-function scopes, or during
7859 tentative template substitution. */
7860 || !at_function_scope_p () || !(complain & tf_error))
7862 if (!(complain & tf_error))
7863 return error_mark_node;
7864 /* `(int) &fn' is not a valid array bound. */
7866 error ("size of array %qD is not an integral constant-expression",
7869 error ("size of array is not an integral constant-expression");
7870 size = integer_one_node;
7872 else if (pedantic && warn_vla != 0)
7875 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7877 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7879 else if (warn_vla > 0)
7883 "variable length array %qD is used", name);
7886 "variable length array is used");
7889 if (processing_template_decl && !TREE_CONSTANT (size))
7890 /* A variable sized array. */
7891 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7894 HOST_WIDE_INT saved_processing_template_decl;
7896 /* Compute the index of the largest element in the array. It is
7897 one less than the number of elements in the array. We save
7898 and restore PROCESSING_TEMPLATE_DECL so that computations in
7899 cp_build_binary_op will be appropriately folded. */
7900 saved_processing_template_decl = processing_template_decl;
7901 processing_template_decl = 0;
7902 itype = cp_build_binary_op (input_location,
7904 cp_convert (ssizetype, size),
7905 cp_convert (ssizetype, integer_one_node),
7906 tf_warning_or_error);
7907 itype = fold (itype);
7908 processing_template_decl = saved_processing_template_decl;
7910 if (!TREE_CONSTANT (itype))
7911 /* A variable sized array. */
7912 itype = variable_size (itype);
7913 /* Make sure that there was no overflow when creating to a signed
7914 index type. (For example, on a 32-bit machine, an array with
7915 size 2^32 - 1 is too big.) */
7916 else if (TREE_CODE (itype) == INTEGER_CST
7917 && TREE_OVERFLOW (itype))
7919 if (!(complain & tf_error))
7920 return error_mark_node;
7921 error ("overflow in array dimension");
7922 TREE_OVERFLOW (itype) = 0;
7926 /* Create and return the appropriate index type. */
7927 if (abi_1_itype && abi_1_itype != error_mark_node)
7929 tree t = build_index_type (itype);
7930 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7931 itype = abi_1_itype;
7934 itype = build_index_type (itype);
7936 /* If the index type were dependent, we would have returned early, so
7937 remember that it isn't. */
7938 TYPE_DEPENDENT_P (itype) = 0;
7939 TYPE_DEPENDENT_P_VALID (itype) = 1;
7943 /* Returns the scope (if any) in which the entity declared by
7944 DECLARATOR will be located. If the entity was declared with an
7945 unqualified name, NULL_TREE is returned. */
7948 get_scope_of_declarator (const cp_declarator *declarator)
7950 while (declarator && declarator->kind != cdk_id)
7951 declarator = declarator->declarator;
7953 /* If the declarator-id is a SCOPE_REF, the scope in which the
7954 declaration occurs is the first operand. */
7956 && declarator->u.id.qualifying_scope)
7957 return declarator->u.id.qualifying_scope;
7959 /* Otherwise, the declarator is not a qualified name; the entity will
7960 be declared in the current scope. */
7964 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7965 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7969 create_array_type_for_decl (tree name, tree type, tree size)
7971 tree itype = NULL_TREE;
7973 /* If things have already gone awry, bail now. */
7974 if (type == error_mark_node || size == error_mark_node)
7975 return error_mark_node;
7977 /* 8.3.4/1: If the type of the identifier of D contains the auto
7978 type-specifier, the program is ill-formed. */
7979 if (pedantic && type_uses_auto (type))
7980 pedwarn (input_location, OPT_pedantic,
7981 "declaration of %qD as array of %<auto%>", name);
7983 /* If there are some types which cannot be array elements,
7984 issue an error-message and return. */
7985 switch (TREE_CODE (type))
7989 error ("declaration of %qD as array of void", name);
7991 error ("creating array of void");
7992 return error_mark_node;
7996 error ("declaration of %qD as array of functions", name);
7998 error ("creating array of functions");
7999 return error_mark_node;
8001 case REFERENCE_TYPE:
8003 error ("declaration of %qD as array of references", name);
8005 error ("creating array of references");
8006 return error_mark_node;
8010 error ("declaration of %qD as array of function members", name);
8012 error ("creating array of function members");
8013 return error_mark_node;
8021 The constant expressions that specify the bounds of the arrays
8022 can be omitted only for the first member of the sequence. */
8023 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8026 error ("declaration of %qD as multidimensional array must "
8027 "have bounds for all dimensions except the first",
8030 error ("multidimensional array must have bounds for all "
8031 "dimensions except the first");
8033 return error_mark_node;
8036 /* Figure out the index type for the array. */
8038 itype = compute_array_index_type (name, size, tf_warning_or_error);
8041 T is called the array element type; this type shall not be [...] an
8042 abstract class type. */
8043 abstract_virtuals_error (name, type);
8045 return build_cplus_array_type (type, itype);
8048 /* Check that it's OK to declare a function with the indicated TYPE.
8049 SFK indicates the kind of special function (if any) that this
8050 function is. OPTYPE is the type given in a conversion operator
8051 declaration, or the class type for a constructor/destructor.
8052 Returns the actual return type of the function; that
8053 may be different than TYPE if an error occurs, or for certain
8054 special functions. */
8057 check_special_function_return_type (special_function_kind sfk,
8063 case sfk_constructor:
8065 error ("return type specification for constructor invalid");
8067 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8068 type = build_pointer_type (optype);
8070 type = void_type_node;
8073 case sfk_destructor:
8075 error ("return type specification for destructor invalid");
8076 /* We can't use the proper return type here because we run into
8077 problems with ambiguous bases and covariant returns.
8078 Java classes are left unchanged because (void *) isn't a valid
8079 Java type, and we don't want to change the Java ABI. */
8080 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8081 type = build_pointer_type (void_type_node);
8083 type = void_type_node;
8086 case sfk_conversion:
8088 error ("return type specified for %<operator %T%>", optype);
8099 /* A variable or data member (whose unqualified name is IDENTIFIER)
8100 has been declared with the indicated TYPE. If the TYPE is not
8101 acceptable, issue an error message and return a type to use for
8102 error-recovery purposes. */
8105 check_var_type (tree identifier, tree type)
8107 if (VOID_TYPE_P (type))
8110 error ("unnamed variable or field declared void");
8111 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8113 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8114 error ("variable or field %qE declared void", identifier);
8117 error ("variable or field declared void");
8118 type = error_mark_node;
8124 /* Given declspecs and a declarator (abstract or otherwise), determine
8125 the name and type of the object declared and construct a DECL node
8128 DECLSPECS points to the representation of declaration-specifier
8129 sequence that precedes declarator.
8131 DECL_CONTEXT says which syntactic context this declaration is in:
8132 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8133 FUNCDEF for a function definition. Like NORMAL but a few different
8134 error messages in each case. Return value may be zero meaning
8135 this definition is too screwy to try to parse.
8136 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8137 handle member functions (which have FIELD context).
8138 Return value may be zero meaning this definition is too screwy to
8140 PARM for a parameter declaration (either within a function prototype
8141 or before a function body). Make a PARM_DECL, or return void_type_node.
8142 TPARM for a template parameter declaration.
8143 CATCHPARM for a parameter declaration before a catch clause.
8144 TYPENAME if for a typename (in a cast or sizeof).
8145 Don't make a DECL node; just return the ..._TYPE node.
8146 FIELD for a struct or union field; make a FIELD_DECL.
8147 BITFIELD for a field with specified width.
8149 INITIALIZED is as for start_decl.
8151 ATTRLIST is a pointer to the list of attributes, which may be NULL
8152 if there are none; *ATTRLIST may be modified if attributes from inside
8153 the declarator should be applied to the declaration.
8155 When this function is called, scoping variables (such as
8156 CURRENT_CLASS_TYPE) should reflect the scope in which the
8157 declaration occurs, not the scope in which the new declaration will
8158 be placed. For example, on:
8162 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8165 Returns a DECL (if a declarator is present), a TYPE (if there is no
8166 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8170 grokdeclarator (const cp_declarator *declarator,
8171 const cp_decl_specifier_seq *declspecs,
8172 enum decl_context decl_context,
8176 tree type = NULL_TREE;
8178 int explicit_int128 = 0;
8179 int virtualp, explicitp, friendp, inlinep, staticp;
8180 int explicit_int = 0;
8181 int explicit_char = 0;
8182 int defaulted_int = 0;
8183 tree dependent_name = NULL_TREE;
8185 tree typedef_decl = NULL_TREE;
8186 const char *name = NULL;
8187 tree typedef_type = NULL_TREE;
8188 /* True if this declarator is a function definition. */
8189 bool funcdef_flag = false;
8190 cp_declarator_kind innermost_code = cdk_error;
8193 /* See the code below that used this. */
8194 tree decl_attr = NULL_TREE;
8197 /* Keep track of what sort of function is being processed
8198 so that we can warn about default return values, or explicit
8199 return values which do not match prescribed defaults. */
8200 special_function_kind sfk = sfk_none;
8202 tree dname = NULL_TREE;
8203 tree ctor_return_type = NULL_TREE;
8204 enum overload_flags flags = NO_SPECIAL;
8205 /* cv-qualifiers that apply to the declarator, for a declaration of
8206 a member function. */
8207 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8208 /* virt-specifiers that apply to the declarator, for a declaration of
8209 a member function. */
8210 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8211 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8213 tree raises = NULL_TREE;
8214 int template_count = 0;
8215 tree returned_attrs = NULL_TREE;
8216 tree parms = NULL_TREE;
8217 const cp_declarator *id_declarator;
8218 /* The unqualified name of the declarator; either an
8219 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8220 tree unqualified_id;
8221 /* The class type, if any, in which this entity is located,
8222 or NULL_TREE if none. Note that this value may be different from
8223 the current class type; for example if an attempt is made to declare
8224 "A::f" inside "B", this value will be "A". */
8225 tree ctype = current_class_type;
8226 /* The NAMESPACE_DECL for the namespace in which this entity is
8227 located. If an unqualified name is used to declare the entity,
8228 this value will be NULL_TREE, even if the entity is located at
8230 tree in_namespace = NULL_TREE;
8231 cp_storage_class storage_class;
8232 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8233 bool type_was_error_mark_node = false;
8234 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8235 bool template_type_arg = false;
8236 bool template_parm_flag = false;
8237 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8240 signed_p = declspecs->specs[(int)ds_signed];
8241 unsigned_p = declspecs->specs[(int)ds_unsigned];
8242 short_p = declspecs->specs[(int)ds_short];
8243 long_p = declspecs->specs[(int)ds_long];
8244 longlong = declspecs->specs[(int)ds_long] >= 2;
8245 explicit_int128 = declspecs->explicit_int128_p;
8246 thread_p = declspecs->specs[(int)ds_thread];
8248 if (decl_context == FUNCDEF)
8249 funcdef_flag = true, decl_context = NORMAL;
8250 else if (decl_context == MEMFUNCDEF)
8251 funcdef_flag = true, decl_context = FIELD;
8252 else if (decl_context == BITFIELD)
8253 bitfield = 1, decl_context = FIELD;
8254 else if (decl_context == TEMPLATE_TYPE_ARG)
8255 template_type_arg = true, decl_context = TYPENAME;
8256 else if (decl_context == TPARM)
8257 template_parm_flag = true, decl_context = PARM;
8259 if (initialized > 1)
8260 funcdef_flag = true;
8262 /* Look inside a declarator for the name being declared
8263 and get it as a string, for an error message. */
8264 for (id_declarator = declarator;
8266 id_declarator = id_declarator->declarator)
8268 if (id_declarator->kind != cdk_id)
8269 innermost_code = id_declarator->kind;
8271 switch (id_declarator->kind)
8274 if (id_declarator->declarator
8275 && id_declarator->declarator->kind == cdk_id)
8277 sfk = id_declarator->declarator->u.id.sfk;
8278 if (sfk == sfk_destructor)
8285 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8286 tree decl = id_declarator->u.id.unqualified_name;
8289 if (qualifying_scope)
8291 if (at_function_scope_p ())
8295 A declarator-id shall not be qualified except
8298 None of the cases are permitted in block
8300 if (qualifying_scope == global_namespace)
8301 error ("invalid use of qualified-name %<::%D%>",
8303 else if (TYPE_P (qualifying_scope))
8304 error ("invalid use of qualified-name %<%T::%D%>",
8305 qualifying_scope, decl);
8307 error ("invalid use of qualified-name %<%D::%D%>",
8308 qualifying_scope, decl);
8309 return error_mark_node;
8311 else if (TYPE_P (qualifying_scope))
8313 ctype = qualifying_scope;
8314 if (innermost_code != cdk_function
8315 && current_class_type
8316 && !UNIQUELY_DERIVED_FROM_P (ctype,
8317 current_class_type))
8319 error ("type %qT is not derived from type %qT",
8320 ctype, current_class_type);
8321 return error_mark_node;
8324 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8325 in_namespace = qualifying_scope;
8327 switch (TREE_CODE (decl))
8333 if (innermost_code != cdk_function)
8335 error ("declaration of %qD as non-function", decl);
8336 return error_mark_node;
8338 else if (!qualifying_scope
8339 && !(current_class_type && at_class_scope_p ()))
8341 error ("declaration of %qD as non-member", decl);
8342 return error_mark_node;
8345 type = TREE_OPERAND (decl, 0);
8347 type = constructor_name (type);
8348 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8353 case TEMPLATE_ID_EXPR:
8355 tree fns = TREE_OPERAND (decl, 0);
8358 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8360 gcc_assert (is_overloaded_fn (dname));
8361 dname = DECL_NAME (get_first_fn (dname));
8366 case IDENTIFIER_NODE:
8367 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8370 if (C_IS_RESERVED_WORD (dname))
8372 error ("declarator-id missing; using reserved word %qD",
8374 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8376 else if (!IDENTIFIER_TYPENAME_P (dname))
8377 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8380 gcc_assert (flags == NO_SPECIAL);
8381 flags = TYPENAME_FLAG;
8382 ctor_return_type = TREE_TYPE (dname);
8383 sfk = sfk_conversion;
8384 if (is_typename_at_global_scope (dname))
8385 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8387 name = "<invalid operator>";
8404 return error_mark_node;
8409 if (id_declarator->kind == cdk_id)
8415 The declarator in a function-definition shall have the form
8416 D1 ( parameter-declaration-clause) ... */
8417 if (funcdef_flag && innermost_code != cdk_function)
8419 error ("function definition does not declare parameters");
8420 return error_mark_node;
8423 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8424 && innermost_code != cdk_function
8425 && ! (ctype && !declspecs->any_specifiers_p))
8427 error ("declaration of %qD as non-function", dname);
8428 return error_mark_node;
8431 /* Anything declared one level down from the top level
8432 must be one of the parameters of a function
8433 (because the body is at least two levels down). */
8435 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8436 by not allowing C++ class definitions to specify their parameters
8437 with xdecls (must be spec.d in the parmlist).
8439 Since we now wait to push a class scope until we are sure that
8440 we are in a legitimate method context, we must set oldcname
8441 explicitly (since current_class_name is not yet alive).
8443 We also want to avoid calling this a PARM if it is in a namespace. */
8445 if (decl_context == NORMAL && !toplevel_bindings_p ())
8447 struct cp_binding_level *b = current_binding_level;
8448 current_binding_level = b->level_chain;
8449 if (current_binding_level != 0 && toplevel_bindings_p ())
8450 decl_context = PARM;
8451 current_binding_level = b;
8455 name = decl_context == PARM ? "parameter" : "type name";
8457 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8459 error ("%<constexpr%> cannot appear in a typedef declaration");
8460 return error_mark_node;
8463 /* If there were multiple types specified in the decl-specifier-seq,
8464 issue an error message. */
8465 if (declspecs->multiple_types_p)
8467 error ("two or more data types in declaration of %qs", name);
8468 return error_mark_node;
8471 if (declspecs->conflicting_specifiers_p)
8473 error ("conflicting specifiers in declaration of %qs", name);
8474 return error_mark_node;
8477 /* Extract the basic type from the decl-specifier-seq. */
8478 type = declspecs->type;
8479 if (type == error_mark_node)
8482 type_was_error_mark_node = true;
8484 /* If the entire declaration is itself tagged as deprecated then
8485 suppress reports of deprecated items. */
8486 if (type && TREE_DEPRECATED (type)
8487 && deprecated_state != DEPRECATED_SUPPRESS)
8488 warn_deprecated_use (type, NULL_TREE);
8489 if (type && TREE_CODE (type) == TYPE_DECL)
8491 typedef_decl = type;
8492 type = TREE_TYPE (typedef_decl);
8493 if (TREE_DEPRECATED (type)
8494 && DECL_ARTIFICIAL (typedef_decl)
8495 && deprecated_state != DEPRECATED_SUPPRESS)
8496 warn_deprecated_use (type, NULL_TREE);
8498 /* No type at all: default to `int', and set DEFAULTED_INT
8499 because it was not a user-defined typedef. */
8500 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8502 /* These imply 'int'. */
8503 type = integer_type_node;
8507 explicit_int = declspecs->explicit_int_p;
8508 explicit_char = declspecs->explicit_char_p;
8511 /* See the code below that used this. */
8513 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8515 typedef_type = type;
8518 if (sfk != sfk_conversion)
8519 ctor_return_type = ctype;
8521 if (sfk != sfk_none)
8522 type = check_special_function_return_type (sfk, type,
8524 else if (type == NULL_TREE)
8530 /* We handle `main' specially here, because 'main () { }' is so
8531 common. With no options, it is allowed. With -Wreturn-type,
8532 it is a warning. It is only an error with -pedantic-errors. */
8533 is_main = (funcdef_flag
8534 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8535 && MAIN_NAME_P (dname)
8536 && ctype == NULL_TREE
8537 && in_namespace == NULL_TREE
8538 && current_namespace == global_namespace);
8540 if (type_was_error_mark_node)
8541 /* We've already issued an error, don't complain more. */;
8542 else if (in_system_header || flag_ms_extensions)
8543 /* Allow it, sigh. */;
8545 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8547 pedwarn (input_location, OPT_pedantic,
8548 "ISO C++ forbids declaration of %qs with no type", name);
8550 warning (OPT_Wreturn_type,
8551 "ISO C++ forbids declaration of %qs with no type", name);
8553 type = integer_type_node;
8558 /* Now process the modifiers that were specified
8559 and check for invalid combinations. */
8561 /* Long double is a special combination. */
8562 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8565 type = cp_build_qualified_type (long_double_type_node,
8566 cp_type_quals (type));
8569 /* Check all other uses of type modifiers. */
8571 if (unsigned_p || signed_p || long_p || short_p)
8575 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8576 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8577 else if (signed_p && unsigned_p)
8578 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8579 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8580 error ("%<long long%> invalid for %qs", name);
8581 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8582 error ("%<__int128%> invalid for %qs", name);
8583 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8584 error ("%<long%> invalid for %qs", name);
8585 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8586 error ("%<short%> invalid for %qs", name);
8587 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8588 error ("%<long%> or %<short%> invalid for %qs", name);
8589 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8590 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8591 else if ((long_p || short_p) && explicit_char)
8592 error ("%<long%> or %<short%> specified with char for %qs", name);
8593 else if (long_p && short_p)
8594 error ("%<long%> and %<short%> specified together for %qs", name);
8595 else if (type == char16_type_node || type == char32_type_node)
8597 if (signed_p || unsigned_p)
8598 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8599 else if (short_p || long_p)
8600 error ("%<short%> or %<long%> invalid for %qs", name);
8605 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8607 pedwarn (input_location, OPT_pedantic,
8608 "long, short, signed or unsigned used invalidly for %qs",
8610 if (flag_pedantic_errors)
8613 if (explicit_int128)
8615 if (int128_integer_type_node == NULL_TREE)
8617 error ("%<__int128%> is not supported by this target");
8622 pedwarn (input_location, OPT_pedantic,
8623 "ISO C++ does not support %<__int128%> for %qs",
8625 if (flag_pedantic_errors)
8631 /* Discard the type modifiers if they are invalid. */
8639 explicit_int128 = false;
8643 /* Decide whether an integer type is signed or not.
8644 Optionally treat bitfields as signed by default. */
8648 It is implementation-defined whether a plain (neither
8649 explicitly signed or unsigned) char, short, int, or long
8650 bit-field is signed or unsigned.
8652 Naturally, we extend this to long long as well. Note that
8653 this does not include wchar_t. */
8654 || (bitfield && !flag_signed_bitfields
8656 /* A typedef for plain `int' without `signed' can be
8657 controlled just like plain `int', but a typedef for
8658 `signed int' cannot be so controlled. */
8660 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8661 && TREE_CODE (type) == INTEGER_TYPE
8662 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8664 if (explicit_int128)
8665 type = int128_unsigned_type_node;
8667 type = long_long_unsigned_type_node;
8669 type = long_unsigned_type_node;
8671 type = short_unsigned_type_node;
8672 else if (type == char_type_node)
8673 type = unsigned_char_type_node;
8674 else if (typedef_decl)
8675 type = unsigned_type_for (type);
8677 type = unsigned_type_node;
8679 else if (signed_p && type == char_type_node)
8680 type = signed_char_type_node;
8681 else if (explicit_int128)
8682 type = int128_integer_type_node;
8684 type = long_long_integer_type_node;
8686 type = long_integer_type_node;
8688 type = short_integer_type_node;
8690 if (declspecs->specs[(int)ds_complex])
8692 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8693 error ("complex invalid for %qs", name);
8694 /* If we just have "complex", it is equivalent to
8695 "complex double", but if any modifiers at all are specified it is
8696 the complex form of TYPE. E.g, "complex short" is
8697 "complex short int". */
8698 else if (defaulted_int && ! longlong && ! explicit_int128
8699 && ! (long_p || short_p || signed_p || unsigned_p))
8700 type = complex_double_type_node;
8701 else if (type == integer_type_node)
8702 type = complex_integer_type_node;
8703 else if (type == float_type_node)
8704 type = complex_float_type_node;
8705 else if (type == double_type_node)
8706 type = complex_double_type_node;
8707 else if (type == long_double_type_node)
8708 type = complex_long_double_type_node;
8710 type = build_complex_type (type);
8713 type_quals = TYPE_UNQUALIFIED;
8714 if (declspecs->specs[(int)ds_const])
8715 type_quals |= TYPE_QUAL_CONST;
8716 if (declspecs->specs[(int)ds_volatile])
8717 type_quals |= TYPE_QUAL_VOLATILE;
8718 if (declspecs->specs[(int)ds_restrict])
8719 type_quals |= TYPE_QUAL_RESTRICT;
8720 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8721 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8724 type_quals |= cp_type_quals (type);
8725 type = cp_build_qualified_type_real
8726 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8727 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8728 /* We might have ignored or rejected some of the qualifiers. */
8729 type_quals = cp_type_quals (type);
8732 inlinep = !! declspecs->specs[(int)ds_inline];
8733 virtualp = !! declspecs->specs[(int)ds_virtual];
8734 explicitp = !! declspecs->specs[(int)ds_explicit];
8736 storage_class = declspecs->storage_class;
8737 if (storage_class == sc_static)
8738 staticp = 1 + (decl_context == FIELD);
8740 if (virtualp && staticp == 2)
8742 error ("member %qD cannot be declared both virtual and static", dname);
8743 storage_class = sc_none;
8746 friendp = !! declspecs->specs[(int)ds_friend];
8748 if (dependent_name && !friendp)
8750 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8751 return error_mark_node;
8754 /* Issue errors about use of storage classes for parameters. */
8755 if (decl_context == PARM)
8757 if (declspecs->specs[(int)ds_typedef])
8759 error ("typedef declaration invalid in parameter declaration");
8760 return error_mark_node;
8762 else if (template_parm_flag && storage_class != sc_none)
8764 error ("storage class specified for template parameter %qs", name);
8765 return error_mark_node;
8767 else if (storage_class == sc_static
8768 || storage_class == sc_extern
8770 error ("storage class specifiers invalid in parameter declarations");
8772 /* Function parameters cannot be constexpr. If we saw one, moan
8773 and pretend it wasn't there. */
8776 error ("a parameter cannot be declared %<constexpr%>");
8781 /* Give error if `virtual' is used outside of class declaration. */
8783 && (current_class_name == NULL_TREE || decl_context != FIELD))
8785 error ("%<virtual%> outside class declaration");
8789 /* Static anonymous unions are dealt with here. */
8790 if (staticp && decl_context == TYPENAME
8792 && ANON_AGGR_TYPE_P (declspecs->type))
8793 decl_context = FIELD;
8795 /* Warn about storage classes that are invalid for certain
8796 kinds of declarations (parameters, typenames, etc.). */
8799 && storage_class != sc_extern
8800 && storage_class != sc_static)
8801 || declspecs->specs[(int)ds_typedef]))
8803 error ("multiple storage classes in declaration of %qs", name);
8806 if (decl_context != NORMAL
8807 && ((storage_class != sc_none
8808 && storage_class != sc_mutable)
8811 if ((decl_context == PARM || decl_context == CATCHPARM)
8812 && (storage_class == sc_register
8813 || storage_class == sc_auto))
8815 else if (declspecs->specs[(int)ds_typedef])
8817 else if (decl_context == FIELD
8818 /* C++ allows static class elements. */
8819 && storage_class == sc_static)
8820 /* C++ also allows inlines and signed and unsigned elements,
8821 but in those cases we don't come in here. */
8825 if (decl_context == FIELD)
8826 error ("storage class specified for %qs", name);
8829 if (decl_context == PARM || decl_context == CATCHPARM)
8830 error ("storage class specified for parameter %qs", name);
8832 error ("storage class specified for typename");
8834 if (storage_class == sc_register
8835 || storage_class == sc_auto
8836 || storage_class == sc_extern
8838 storage_class = sc_none;
8841 else if (storage_class == sc_extern && funcdef_flag
8842 && ! toplevel_bindings_p ())
8843 error ("nested function %qs declared %<extern%>", name);
8844 else if (toplevel_bindings_p ())
8846 if (storage_class == sc_auto)
8847 error ("top-level declaration of %qs specifies %<auto%>", name);
8850 && storage_class != sc_extern
8851 && storage_class != sc_static)
8853 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8858 if (storage_class && friendp)
8860 error ("storage class specifiers invalid in friend function declarations");
8861 storage_class = sc_none;
8866 unqualified_id = NULL_TREE;
8869 unqualified_id = id_declarator->u.id.unqualified_name;
8870 switch (TREE_CODE (unqualified_id))
8873 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8874 if (TYPE_P (unqualified_id))
8875 unqualified_id = constructor_name (unqualified_id);
8878 case IDENTIFIER_NODE:
8879 case TEMPLATE_ID_EXPR:
8887 /* Determine the type of the entity declared by recurring on the
8889 for (; declarator; declarator = declarator->declarator)
8891 const cp_declarator *inner_declarator;
8894 if (type == error_mark_node)
8895 return error_mark_node;
8897 attrs = declarator->attributes;
8903 if (declarator == NULL || declarator->kind == cdk_id)
8904 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8905 if (declarator->kind == cdk_function)
8906 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8907 if (declarator->kind == cdk_array)
8908 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8909 returned_attrs = decl_attributes (&type,
8910 chainon (returned_attrs, attrs),
8914 if (declarator->kind == cdk_id)
8917 inner_declarator = declarator->declarator;
8919 switch (declarator->kind)
8922 type = create_array_type_for_decl (dname, type,
8923 declarator->u.array.bounds);
8931 /* Declaring a function type.
8932 Make sure we have a valid type for the function to return. */
8934 if (type_quals != TYPE_UNQUALIFIED)
8936 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8937 warning (OPT_Wignored_qualifiers,
8938 "type qualifiers ignored on function return type");
8939 /* We now know that the TYPE_QUALS don't apply to the
8940 decl, but to its return type. */
8941 type_quals = TYPE_UNQUALIFIED;
8943 errmsg = targetm.invalid_return_type (type);
8947 type = integer_type_node;
8950 /* Error about some types functions can't return. */
8952 if (TREE_CODE (type) == FUNCTION_TYPE)
8954 error ("%qs declared as function returning a function", name);
8955 return error_mark_node;
8957 if (TREE_CODE (type) == ARRAY_TYPE)
8959 error ("%qs declared as function returning an array", name);
8960 return error_mark_node;
8963 /* Pick up type qualifiers which should be applied to `this'. */
8964 memfn_quals = declarator->u.function.qualifiers;
8965 /* Pick up virt-specifiers. */
8966 virt_specifiers = declarator->u.function.virt_specifiers;
8967 /* Pick up the exception specifications. */
8968 raises = declarator->u.function.exception_specification;
8970 /* Say it's a definition only for the CALL_EXPR
8971 closest to the identifier. */
8972 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8974 /* Handle a late-specified return type. */
8977 if (type_uses_auto (type))
8979 if (!declarator->u.function.late_return_type)
8981 error ("%qs function uses %<auto%> type specifier without"
8982 " late return type", name);
8983 return error_mark_node;
8985 else if (!is_auto (type))
8987 error ("%qs function with late return type has"
8988 " %qT as its type rather than plain %<auto%>",
8990 return error_mark_node;
8993 else if (declarator->u.function.late_return_type)
8995 error ("%qs function with late return type not declared"
8996 " with %<auto%> type specifier", name);
8997 return error_mark_node;
9000 type = splice_late_return_type
9001 (type, declarator->u.function.late_return_type);
9002 if (type == error_mark_node)
9003 return error_mark_node;
9005 if (ctype == NULL_TREE
9006 && decl_context == FIELD
9008 && (friendp == 0 || dname == current_class_name))
9009 ctype = current_class_type;
9011 if (ctype && (sfk == sfk_constructor
9012 || sfk == sfk_destructor))
9014 /* We are within a class's scope. If our declarator name
9015 is the same as the class name, and we are defining
9016 a function, then it is a constructor/destructor, and
9017 therefore returns a void type. */
9019 /* ISO C++ 12.4/2. A destructor may not be declared
9020 const or volatile. A destructor may not be
9023 ISO C++ 12.1. A constructor may not be declared
9024 const or volatile. A constructor may not be
9025 virtual. A constructor may not be static. */
9027 error ((flags == DTOR_FLAG)
9028 ? "destructor cannot be static member function"
9029 : "constructor cannot be static member function");
9032 error ((flags == DTOR_FLAG)
9033 ? "destructors may not be cv-qualified"
9034 : "constructors may not be cv-qualified");
9035 memfn_quals = TYPE_UNQUALIFIED;
9038 if (decl_context == FIELD
9039 && !member_function_or_else (ctype,
9042 return error_mark_node;
9044 if (flags != DTOR_FLAG)
9046 /* It's a constructor. */
9051 permerror (input_location, "constructors cannot be declared virtual");
9054 if (decl_context == FIELD
9055 && sfk != sfk_constructor)
9056 return error_mark_node;
9058 if (decl_context == FIELD)
9064 error ("can%'t initialize friend function %qs", name);
9067 /* Cannot be both friend and virtual. */
9068 error ("virtual functions cannot be friends");
9071 if (decl_context == NORMAL)
9072 error ("friend declaration not in class definition");
9073 if (current_function_decl && funcdef_flag)
9074 error ("can%'t define friend function %qs in a local "
9078 else if (ctype && sfk == sfk_conversion)
9082 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9087 arg_types = grokparms (declarator->u.function.parameters,
9090 if (inner_declarator
9091 && inner_declarator->kind == cdk_id
9092 && inner_declarator->u.id.sfk == sfk_destructor
9093 && arg_types != void_list_node)
9095 error ("destructors may not have parameters");
9096 arg_types = void_list_node;
9100 type = build_function_type (type, arg_types);
9107 /* Filter out pointers-to-references and references-to-references.
9108 We can get these if a TYPE_DECL is used. */
9110 if (TREE_CODE (type) == REFERENCE_TYPE)
9112 if (declarator->kind != cdk_reference)
9114 error ("cannot declare pointer to %q#T", type);
9115 type = TREE_TYPE (type);
9118 /* In C++0x, we allow reference to reference declarations
9119 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9120 and template type arguments [14.3.1/4 temp.arg.type]. The
9121 check for direct reference to reference declarations, which
9122 are still forbidden, occurs below. Reasoning behind the change
9123 can be found in DR106, DR540, and the rvalue reference
9125 else if (cxx_dialect == cxx98)
9127 error ("cannot declare reference to %q#T", type);
9128 type = TREE_TYPE (type);
9131 else if (VOID_TYPE_P (type))
9133 if (declarator->kind == cdk_reference)
9134 error ("cannot declare reference to %q#T", type);
9135 else if (declarator->kind == cdk_ptrmem)
9136 error ("cannot declare pointer to %q#T member", type);
9139 /* We now know that the TYPE_QUALS don't apply to the decl,
9140 but to the target of the pointer. */
9141 type_quals = TYPE_UNQUALIFIED;
9143 if (declarator->kind == cdk_ptrmem
9144 && (TREE_CODE (type) == FUNCTION_TYPE
9145 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9147 memfn_quals |= type_memfn_quals (type);
9148 type = build_memfn_type (type,
9149 declarator->u.pointer.class_type,
9151 if (type == error_mark_node)
9152 return error_mark_node;
9153 memfn_quals = TYPE_UNQUALIFIED;
9156 if (TREE_CODE (type) == FUNCTION_TYPE
9157 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9158 error (declarator->kind == cdk_reference
9159 ? G_("cannot declare reference to qualified function type %qT")
9160 : G_("cannot declare pointer to qualified function type %qT"),
9163 /* When the pointed-to type involves components of variable size,
9164 care must be taken to ensure that the size evaluation code is
9165 emitted early enough to dominate all the possible later uses
9166 and late enough for the variables on which it depends to have
9169 This is expected to happen automatically when the pointed-to
9170 type has a name/declaration of it's own, but special attention
9171 is required if the type is anonymous.
9173 We handle the NORMAL and FIELD contexts here by inserting a
9174 dummy statement that just evaluates the size at a safe point
9175 and ensures it is not deferred until e.g. within a deeper
9176 conditional context (c++/43555).
9178 We expect nothing to be needed here for PARM or TYPENAME.
9179 Evaluating the size at this point for TYPENAME would
9180 actually be incorrect, as we might be in the middle of an
9181 expression with side effects on the pointed-to type size
9182 "arguments" prior to the pointer declaration point and the
9183 size evaluation could end up prior to the side effects. */
9185 if (!TYPE_NAME (type)
9186 && (decl_context == NORMAL || decl_context == FIELD)
9187 && at_function_scope_p ()
9188 && variably_modified_type_p (type, NULL_TREE))
9190 /* First break out any side-effects. */
9191 stabilize_vla_size (TYPE_SIZE (type));
9192 /* And then force evaluation of the SAVE_EXPR. */
9193 finish_expr_stmt (TYPE_SIZE (type));
9196 if (declarator->kind == cdk_reference)
9198 /* In C++0x, the type we are creating a reference to might be
9199 a typedef which is itself a reference type. In that case,
9200 we follow the reference collapsing rules in
9201 [7.1.3/8 dcl.typedef] to create the final reference type:
9203 "If a typedef TD names a type that is a reference to a type
9204 T, an attempt to create the type 'lvalue reference to cv TD'
9205 creates the type 'lvalue reference to T,' while an attempt
9206 to create the type "rvalue reference to cv TD' creates the
9209 if (VOID_TYPE_P (type))
9210 /* We already gave an error. */;
9211 else if (TREE_CODE (type) == REFERENCE_TYPE)
9213 if (declarator->u.reference.rvalue_ref)
9214 /* Leave type alone. */;
9216 type = cp_build_reference_type (TREE_TYPE (type), false);
9219 type = cp_build_reference_type
9220 (type, declarator->u.reference.rvalue_ref);
9222 /* In C++0x, we need this check for direct reference to
9223 reference declarations, which are forbidden by
9224 [8.3.2/5 dcl.ref]. Reference to reference declarations
9225 are only allowed indirectly through typedefs and template
9226 type arguments. Example:
9228 void foo(int & &); // invalid ref-to-ref decl
9230 typedef int & int_ref;
9231 void foo(int_ref &); // valid ref-to-ref decl
9233 if (inner_declarator && inner_declarator->kind == cdk_reference)
9234 error ("cannot declare reference to %q#T, which is not "
9235 "a typedef or a template type argument", type);
9237 else if (TREE_CODE (type) == METHOD_TYPE)
9238 type = build_ptrmemfunc_type (build_pointer_type (type));
9239 else if (declarator->kind == cdk_ptrmem)
9241 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9243 if (declarator->u.pointer.class_type == error_mark_node)
9244 /* We will already have complained. */
9245 type = error_mark_node;
9247 type = build_ptrmem_type (declarator->u.pointer.class_type,
9251 type = build_pointer_type (type);
9253 /* Process a list of type modifier keywords (such as
9254 const or volatile) that were given inside the `*' or `&'. */
9256 if (declarator->u.pointer.qualifiers)
9259 = cp_build_qualified_type (type,
9260 declarator->u.pointer.qualifiers);
9261 type_quals = cp_type_quals (type);
9274 /* We need to stabilize side-effects in VLA sizes for regular array
9275 declarations too, not just pointers to arrays. */
9276 if (type != error_mark_node && !TYPE_NAME (type)
9277 && (decl_context == NORMAL || decl_context == FIELD)
9278 && at_function_scope_p ()
9279 && variably_modified_type_p (type, NULL_TREE))
9280 stabilize_vla_size (TYPE_SIZE (type));
9282 /* A `constexpr' specifier used in an object declaration declares
9283 the object as `const'. */
9284 if (constexpr_p && innermost_code != cdk_function)
9286 if (type_quals & TYPE_QUAL_CONST)
9287 error ("both %<const%> and %<constexpr%> cannot be used here");
9288 if (type_quals & TYPE_QUAL_VOLATILE)
9289 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9290 type_quals |= TYPE_QUAL_CONST;
9291 type = cp_build_qualified_type (type, type_quals);
9294 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9295 && TREE_CODE (type) != FUNCTION_TYPE
9296 && TREE_CODE (type) != METHOD_TYPE)
9298 error ("template-id %qD used as a declarator",
9300 unqualified_id = dname;
9303 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9304 qualified with a class-name, turn it into a METHOD_TYPE, unless
9305 we know that the function is static. We take advantage of this
9306 opportunity to do other processing that pertains to entities
9307 explicitly declared to be class members. Note that if DECLARATOR
9308 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9309 would not have exited the loop above. */
9311 && declarator->u.id.qualifying_scope
9312 && TYPE_P (declarator->u.id.qualifying_scope))
9316 ctype = declarator->u.id.qualifying_scope;
9317 ctype = TYPE_MAIN_VARIANT (ctype);
9319 while (t != NULL_TREE && CLASS_TYPE_P (t))
9321 /* You're supposed to have one `template <...>' for every
9322 template class, but you don't need one for a full
9323 specialization. For example:
9325 template <class T> struct S{};
9326 template <> struct S<int> { void f(); };
9327 void S<int>::f () {}
9329 is correct; there shouldn't be a `template <>' for the
9330 definition of `S<int>::f'. */
9331 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9332 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9333 /* T is an explicit (not partial) specialization. All
9334 containing classes must therefore also be explicitly
9337 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9338 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9339 template_count += 1;
9341 t = TYPE_MAIN_DECL (t);
9342 t = DECL_CONTEXT (t);
9345 if (ctype == current_class_type)
9349 permerror (input_location, "member functions are implicitly friends of their class");
9353 permerror (declarator->id_loc,
9354 "extra qualification %<%T::%> on member %qs",
9357 else if (/* If the qualifying type is already complete, then we
9358 can skip the following checks. */
9359 !COMPLETE_TYPE_P (ctype)
9360 && (/* If the function is being defined, then
9361 qualifying type must certainly be complete. */
9363 /* A friend declaration of "T::f" is OK, even if
9364 "T" is a template parameter. But, if this
9365 function is not a friend, the qualifying type
9367 || (!friendp && !CLASS_TYPE_P (ctype))
9368 /* For a declaration, the type need not be
9369 complete, if either it is dependent (since there
9370 is no meaningful definition of complete in that
9371 case) or the qualifying class is currently being
9373 || !(dependent_type_p (ctype)
9374 || currently_open_class (ctype)))
9375 /* Check that the qualifying type is complete. */
9376 && !complete_type_or_else (ctype, NULL_TREE))
9377 return error_mark_node;
9378 else if (TREE_CODE (type) == FUNCTION_TYPE)
9380 if (current_class_type
9381 && (!friendp || funcdef_flag))
9384 ? "cannot define member function %<%T::%s%> within %<%T%>"
9385 : "cannot declare member function %<%T::%s%> within %<%T%>",
9386 ctype, name, current_class_type);
9387 return error_mark_node;
9390 else if (declspecs->specs[(int)ds_typedef]
9391 && current_class_type)
9393 error ("cannot declare member %<%T::%s%> within %qT",
9394 ctype, name, current_class_type);
9395 return error_mark_node;
9399 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9400 ctype = current_class_type;
9402 /* Now TYPE has the actual type. */
9407 *attrlist = chainon (returned_attrs, *attrlist);
9409 attrlist = &returned_attrs;
9412 /* Handle parameter packs. */
9413 if (parameter_pack_p)
9415 if (decl_context == PARM)
9416 /* Turn the type into a pack expansion.*/
9417 type = make_pack_expansion (type);
9419 error ("non-parameter %qs cannot be a parameter pack", name);
9422 /* Did array size calculations overflow? */
9424 if (TREE_CODE (type) == ARRAY_TYPE
9425 && COMPLETE_TYPE_P (type)
9426 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9427 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9429 error ("size of array %qs is too large", name);
9430 /* If we proceed with the array type as it is, we'll eventually
9431 crash in tree_low_cst(). */
9432 type = error_mark_node;
9435 if ((decl_context == FIELD || decl_context == PARM)
9436 && !processing_template_decl
9437 && variably_modified_type_p (type, NULL_TREE))
9439 if (decl_context == FIELD)
9440 error ("data member may not have variably modified type %qT", type);
9442 error ("parameter may not have variably modified type %qT", type);
9443 type = error_mark_node;
9446 if (explicitp == 1 || (explicitp && friendp))
9448 /* [dcl.fct.spec] The explicit specifier shall only be used in
9449 declarations of constructors within a class definition. */
9450 error ("only declarations of constructors can be %<explicit%>");
9454 if (storage_class == sc_mutable)
9456 if (decl_context != FIELD || friendp)
9458 error ("non-member %qs cannot be declared %<mutable%>", name);
9459 storage_class = sc_none;
9461 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9463 error ("non-object member %qs cannot be declared %<mutable%>", name);
9464 storage_class = sc_none;
9466 else if (TREE_CODE (type) == FUNCTION_TYPE
9467 || TREE_CODE (type) == METHOD_TYPE)
9469 error ("function %qs cannot be declared %<mutable%>", name);
9470 storage_class = sc_none;
9474 error ("static %qs cannot be declared %<mutable%>", name);
9475 storage_class = sc_none;
9477 else if (type_quals & TYPE_QUAL_CONST)
9479 error ("const %qs cannot be declared %<mutable%>", name);
9480 storage_class = sc_none;
9482 else if (TREE_CODE (type) == REFERENCE_TYPE)
9484 permerror (input_location, "reference %qs cannot be declared "
9485 "%<mutable%>", name);
9486 storage_class = sc_none;
9490 /* If this is declaring a typedef name, return a TYPE_DECL. */
9491 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9495 /* Note that the grammar rejects storage classes
9496 in typenames, fields or parameters. */
9497 if (current_lang_name == lang_name_java)
9498 TYPE_FOR_JAVA (type) = 1;
9500 /* This declaration:
9502 typedef void f(int) const;
9504 declares a function type which is not a member of any
9505 particular class, but which is cv-qualified; for
9506 example "f S::*" declares a pointer to a const-qualified
9507 member function of S. We record the cv-qualification in the
9509 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9511 type = apply_memfn_quals (type, memfn_quals);
9513 /* We have now dealt with these qualifiers. */
9514 memfn_quals = TYPE_UNQUALIFIED;
9517 if (type_uses_auto (type))
9519 error ("typedef declared %<auto%>");
9520 type = error_mark_node;
9523 if (decl_context == FIELD)
9524 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9526 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9527 if (id_declarator && declarator->u.id.qualifying_scope) {
9528 error_at (DECL_SOURCE_LOCATION (decl),
9529 "typedef name may not be a nested-name-specifier");
9530 TREE_TYPE (decl) = error_mark_node;
9533 if (decl_context != FIELD)
9535 if (!current_function_decl)
9536 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9537 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9538 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9539 (current_function_decl)))
9540 /* The TYPE_DECL is "abstract" because there will be
9541 clones of this constructor/destructor, and there will
9542 be copies of this TYPE_DECL generated in those
9544 DECL_ABSTRACT (decl) = 1;
9546 else if (constructor_name_p (unqualified_id, current_class_type))
9547 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9548 "as enclosing class",
9551 /* If the user declares "typedef struct {...} foo" then the
9552 struct will have an anonymous name. Fill that name in now.
9553 Nothing can refer to it, so nothing needs know about the name
9555 if (type != error_mark_node
9558 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9559 && TYPE_ANONYMOUS_P (type)
9560 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9564 /* Replace the anonymous name with the real name everywhere. */
9565 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9567 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9568 /* We do not rename the debug info representing the
9569 anonymous tagged type because the standard says in
9570 [dcl.typedef] that the naming applies only for
9571 linkage purposes. */
9572 /*debug_hooks->set_name (t, decl);*/
9573 TYPE_NAME (t) = decl;
9576 if (TYPE_LANG_SPECIFIC (type))
9577 TYPE_WAS_ANONYMOUS (type) = 1;
9579 /* If this is a typedef within a template class, the nested
9580 type is a (non-primary) template. The name for the
9581 template needs updating as well. */
9582 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9583 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9584 = TYPE_IDENTIFIER (type);
9586 /* Adjust linkage now that we aren't anonymous anymore. */
9587 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9588 determine_visibility (TYPE_MAIN_DECL (type));
9590 /* FIXME remangle member functions; member functions of a
9591 type with external linkage have external linkage. */
9595 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9596 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9598 bad_specifiers (decl, BSP_TYPE, virtualp,
9599 memfn_quals != TYPE_UNQUALIFIED,
9600 inlinep, friendp, raises != NULL_TREE);
9605 /* Detect the case of an array type of unspecified size
9606 which came, as such, direct from a typedef name.
9607 We must copy the type, so that the array's domain can be
9608 individually set by the object's initializer. */
9610 if (type && typedef_type
9611 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9612 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9613 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9615 /* Detect where we're using a typedef of function type to declare a
9616 function. PARMS will not be set, so we must create it now. */
9618 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9620 tree decls = NULL_TREE;
9623 for (args = TYPE_ARG_TYPES (type);
9624 args && args != void_list_node;
9625 args = TREE_CHAIN (args))
9627 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9629 DECL_CHAIN (decl) = decls;
9633 parms = nreverse (decls);
9635 if (decl_context != TYPENAME)
9637 /* A cv-qualifier-seq shall only be part of the function type
9638 for a non-static member function. [8.3.5/4 dcl.fct] */
9639 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9640 && (current_class_type == NULL_TREE || staticp) )
9643 ? G_("qualified function types cannot be used to "
9644 "declare static member functions")
9645 : G_("qualified function types cannot be used to "
9646 "declare free functions"));
9647 type = TYPE_MAIN_VARIANT (type);
9650 /* The qualifiers on the function type become the qualifiers on
9651 the non-static member function. */
9652 memfn_quals |= type_memfn_quals (type);
9653 type_quals = TYPE_UNQUALIFIED;
9657 /* If this is a type name (such as, in a cast or sizeof),
9658 compute the type and return it now. */
9660 if (decl_context == TYPENAME)
9662 /* Note that the grammar rejects storage classes
9663 in typenames, fields or parameters. */
9664 if (type_quals != TYPE_UNQUALIFIED)
9665 type_quals = TYPE_UNQUALIFIED;
9667 /* Special case: "friend class foo" looks like a TYPENAME context. */
9670 if (type_quals != TYPE_UNQUALIFIED)
9672 error ("type qualifiers specified for friend class declaration");
9673 type_quals = TYPE_UNQUALIFIED;
9677 error ("%<inline%> specified for friend class declaration");
9683 /* Don't allow friend declaration without a class-key. */
9684 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9685 permerror (input_location, "template parameters cannot be friends");
9686 else if (TREE_CODE (type) == TYPENAME_TYPE)
9687 permerror (input_location, "friend declaration requires class-key, "
9688 "i.e. %<friend class %T::%D%>",
9689 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9691 permerror (input_location, "friend declaration requires class-key, "
9692 "i.e. %<friend %#T%>",
9696 /* Only try to do this stuff if we didn't already give up. */
9697 if (type != integer_type_node)
9699 /* A friendly class? */
9700 if (current_class_type)
9701 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9704 error ("trying to make class %qT a friend of global scope",
9707 type = void_type_node;
9710 else if (memfn_quals)
9712 if (ctype == NULL_TREE
9713 && TREE_CODE (type) == METHOD_TYPE)
9714 ctype = TYPE_METHOD_BASETYPE (type);
9717 type = build_memfn_type (type, ctype, memfn_quals);
9718 /* Core issue #547: need to allow this in template type args. */
9719 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9720 type = apply_memfn_quals (type, memfn_quals);
9722 error ("invalid qualifiers on non-member function type");
9727 else if (unqualified_id == NULL_TREE && decl_context != PARM
9728 && decl_context != CATCHPARM
9729 && TREE_CODE (type) != UNION_TYPE
9732 error ("abstract declarator %qT used as declaration", type);
9733 return error_mark_node;
9736 /* Only functions may be declared using an operator-function-id. */
9738 && IDENTIFIER_OPNAME_P (unqualified_id)
9739 && TREE_CODE (type) != FUNCTION_TYPE
9740 && TREE_CODE (type) != METHOD_TYPE)
9742 error ("declaration of %qD as non-function", unqualified_id);
9743 return error_mark_node;
9746 /* We don't check parameter types here because we can emit a better
9747 error message later. */
9748 if (decl_context != PARM)
9750 type = check_var_type (unqualified_id, type);
9751 if (type == error_mark_node)
9752 return error_mark_node;
9755 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9756 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9758 if (decl_context == PARM || decl_context == CATCHPARM)
9760 if (ctype || in_namespace)
9761 error ("cannot use %<::%> in parameter declaration");
9763 if (type_uses_auto (type))
9765 error ("parameter declared %<auto%>");
9766 type = error_mark_node;
9769 /* A parameter declared as an array of T is really a pointer to T.
9770 One declared as a function is really a pointer to a function.
9771 One declared as a member is really a pointer to member. */
9773 if (TREE_CODE (type) == ARRAY_TYPE)
9775 /* Transfer const-ness of array into that of type pointed to. */
9776 type = build_pointer_type (TREE_TYPE (type));
9777 type_quals = TYPE_UNQUALIFIED;
9779 else if (TREE_CODE (type) == FUNCTION_TYPE)
9780 type = build_pointer_type (type);
9783 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9784 && !NEW_DELETE_OPNAME_P (unqualified_id))
9786 cp_cv_quals real_quals = memfn_quals;
9787 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9788 real_quals |= TYPE_QUAL_CONST;
9789 type = build_memfn_type (type, ctype, real_quals);
9795 if (decl_context == PARM)
9797 decl = cp_build_parm_decl (unqualified_id, type);
9799 bad_specifiers (decl, BSP_PARM, virtualp,
9800 memfn_quals != TYPE_UNQUALIFIED,
9801 inlinep, friendp, raises != NULL_TREE);
9803 else if (decl_context == FIELD)
9805 /* The C99 flexible array extension. */
9806 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9807 && TYPE_DOMAIN (type) == NULL_TREE)
9809 tree itype = compute_array_index_type (dname, integer_zero_node,
9810 tf_warning_or_error);
9811 type = build_cplus_array_type (TREE_TYPE (type), itype);
9814 if (type == error_mark_node)
9816 /* Happens when declaring arrays of sizes which
9817 are error_mark_node, for example. */
9820 else if (in_namespace && !friendp)
9822 /* Something like struct S { int N::j; }; */
9823 error ("invalid use of %<::%>");
9824 return error_mark_node;
9826 else if (TREE_CODE (type) == FUNCTION_TYPE
9827 || TREE_CODE (type) == METHOD_TYPE)
9830 tree function_context;
9834 /* This should never happen in pure C++ (the check
9835 could be an assert). It could happen in
9836 Objective-C++ if someone writes invalid code that
9837 uses a function declaration for an instance
9838 variable or property (instance variables and
9839 properties are parsed as FIELD_DECLs, but they are
9840 part of an Objective-C class, not a C++ class).
9841 That code is invalid and is caught by this
9845 error ("declaration of function %qD in invalid context",
9847 return error_mark_node;
9850 /* ``A union may [ ... ] not [ have ] virtual functions.''
9852 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9854 error ("function %qD declared virtual inside a union",
9856 return error_mark_node;
9859 if (NEW_DELETE_OPNAME_P (unqualified_id))
9863 error ("%qD cannot be declared virtual, since it "
9871 /* Check that the name used for a destructor makes sense. */
9872 if (sfk == sfk_destructor)
9874 tree uqname = id_declarator->u.id.unqualified_name;
9878 gcc_assert (friendp);
9879 error ("expected qualified name in friend declaration "
9880 "for destructor %qD", uqname);
9881 return error_mark_node;
9884 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9886 error ("declaration of %qD as member of %qT",
9888 return error_mark_node;
9892 error ("a destructor cannot be %<constexpr%>");
9893 return error_mark_node;
9896 else if (sfk == sfk_constructor && friendp && !ctype)
9898 error ("expected qualified name in friend declaration "
9899 "for constructor %qD",
9900 id_declarator->u.id.unqualified_name);
9901 return error_mark_node;
9904 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9905 function_context = (ctype != NULL_TREE) ?
9906 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9907 publicp = (! friendp || ! staticp)
9908 && function_context == NULL_TREE;
9909 decl = grokfndecl (ctype, type,
9910 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9911 ? unqualified_id : dname,
9914 virtualp, flags, memfn_quals, raises,
9915 friendp ? -1 : 0, friendp, publicp,
9916 inlinep | (2 * constexpr_p),
9918 funcdef_flag, template_count, in_namespace,
9919 attrlist, declarator->id_loc);
9920 decl = set_virt_specifiers (decl, virt_specifiers);
9921 if (decl == NULL_TREE)
9922 return error_mark_node;
9924 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9925 /* The decl and setting of decl_attr is also turned off. */
9926 decl = build_decl_attribute_variant (decl, decl_attr);
9929 /* [class.conv.ctor]
9931 A constructor declared without the function-specifier
9932 explicit that can be called with a single parameter
9933 specifies a conversion from the type of its first
9934 parameter to the type of its class. Such a constructor
9935 is called a converting constructor. */
9937 DECL_NONCONVERTING_P (decl) = 1;
9939 else if (!staticp && !dependent_type_p (type)
9940 && !COMPLETE_TYPE_P (complete_type (type))
9941 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9944 error ("field %qD has incomplete type", unqualified_id);
9946 error ("name %qT has incomplete type", type);
9948 /* If we're instantiating a template, tell them which
9949 instantiation made the field's type be incomplete. */
9950 if (current_class_type
9951 && TYPE_NAME (current_class_type)
9952 && IDENTIFIER_TEMPLATE (current_class_name)
9954 && declspecs->type == type)
9955 error (" in instantiation of template %qT",
9956 current_class_type);
9958 return error_mark_node;
9964 error ("%qE is neither function nor member function; "
9965 "cannot be declared friend", unqualified_id);
9973 /* Friends are treated specially. */
9974 if (ctype == current_class_type)
9975 ; /* We already issued a permerror. */
9976 else if (decl && DECL_NAME (decl))
9978 if (template_class_depth (current_class_type) == 0)
9980 decl = check_explicit_specialization
9981 (unqualified_id, decl, template_count,
9982 2 * funcdef_flag + 4);
9983 if (decl == error_mark_node)
9984 return error_mark_node;
9987 decl = do_friend (ctype, unqualified_id, decl,
9993 return error_mark_node;
9996 /* Structure field. It may not be a function, except for C++. */
9998 if (decl == NULL_TREE)
10004 /* An attempt is being made to initialize a non-static
10005 member. But, from [class.mem]:
10007 4 A member-declarator can contain a
10008 constant-initializer only if it declares a static
10009 member (_class.static_) of integral or enumeration
10010 type, see _class.static.data_.
10012 This used to be relatively common practice, but
10013 the rest of the compiler does not correctly
10014 handle the initialization unless the member is
10015 static so we make it static below. */
10016 if (cxx_dialect >= cxx0x)
10018 sorry ("non-static data member initializers");
10022 permerror (input_location, "ISO C++ forbids initialization of member %qD",
10024 permerror (input_location, "making %qD static", unqualified_id);
10029 if (uses_template_parms (type))
10030 /* We'll check at instantiation time. */
10032 else if (constexpr_p)
10033 /* constexpr has the same requirements. */
10035 else if (check_static_variable_definition (unqualified_id,
10037 /* If we just return the declaration, crashes
10038 will sometimes occur. We therefore return
10039 void_type_node, as if this was a friend
10040 declaration, to cause callers to completely
10041 ignore this declaration. */
10042 return error_mark_node;
10047 /* C++ allows static class members. All other work
10048 for this is done by grokfield. */
10049 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10050 set_linkage_for_static_data_member (decl);
10051 /* Even if there is an in-class initialization, DECL
10052 is considered undefined until an out-of-class
10053 definition is provided. */
10054 DECL_EXTERNAL (decl) = 1;
10057 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10059 if (constexpr_p && !initialized)
10061 error ("constexpr static data member %qD must have an "
10062 "initializer", decl);
10063 constexpr_p = false;
10070 error ("non-static data member %qE declared %<constexpr%>",
10072 constexpr_p = false;
10074 decl = build_decl (input_location,
10075 FIELD_DECL, unqualified_id, type);
10076 DECL_NONADDRESSABLE_P (decl) = bitfield;
10077 if (bitfield && !unqualified_id)
10078 TREE_NO_WARNING (decl) = 1;
10080 if (storage_class == sc_mutable)
10082 DECL_MUTABLE_P (decl) = 1;
10083 storage_class = sc_none;
10087 bad_specifiers (decl, BSP_FIELD, virtualp,
10088 memfn_quals != TYPE_UNQUALIFIED,
10089 inlinep, friendp, raises != NULL_TREE);
10092 else if (TREE_CODE (type) == FUNCTION_TYPE
10093 || TREE_CODE (type) == METHOD_TYPE)
10095 tree original_name;
10098 if (!unqualified_id)
10099 return error_mark_node;
10101 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10102 original_name = dname;
10104 original_name = unqualified_id;
10106 if (storage_class == sc_auto)
10107 error ("storage class %<auto%> invalid for function %qs", name);
10108 else if (storage_class == sc_register)
10109 error ("storage class %<register%> invalid for function %qs", name);
10111 error ("storage class %<__thread%> invalid for function %qs", name);
10113 if (virt_specifiers)
10114 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10115 /* Function declaration not at top level.
10116 Storage classes other than `extern' are not allowed
10117 and `extern' makes no difference. */
10118 if (! toplevel_bindings_p ()
10119 && (storage_class == sc_static
10120 || declspecs->specs[(int)ds_inline])
10123 if (storage_class == sc_static)
10124 pedwarn (input_location, OPT_pedantic,
10125 "%<static%> specified invalid for function %qs "
10126 "declared out of global scope", name);
10128 pedwarn (input_location, OPT_pedantic,
10129 "%<inline%> specifier invalid for function %qs "
10130 "declared out of global scope", name);
10133 if (ctype != NULL_TREE
10134 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
10136 error ("%q#T is not a class or a namespace", ctype);
10140 if (ctype == NULL_TREE)
10144 error ("virtual non-class function %qs", name);
10147 else if (sfk == sfk_constructor
10148 || sfk == sfk_destructor)
10150 error (funcdef_flag
10151 ? "%qs defined in a non-class scope"
10152 : "%qs declared in a non-class scope", name);
10157 /* Record presence of `static'. */
10158 publicp = (ctype != NULL_TREE
10159 || storage_class == sc_extern
10160 || storage_class != sc_static);
10162 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10163 virtualp, flags, memfn_quals, raises,
10165 publicp, inlinep | (2 * constexpr_p), sfk,
10167 template_count, in_namespace, attrlist,
10168 declarator->id_loc);
10169 if (decl == NULL_TREE)
10170 return error_mark_node;
10174 int invalid_static = 0;
10176 /* Don't allow a static member function in a class, and forbid
10177 declaring main to be static. */
10178 if (TREE_CODE (type) == METHOD_TYPE)
10180 permerror (input_location, "cannot declare member function %qD to have "
10181 "static linkage", decl);
10182 invalid_static = 1;
10184 else if (current_function_decl)
10186 /* FIXME need arm citation */
10187 error ("cannot declare static function inside another function");
10188 invalid_static = 1;
10191 if (invalid_static)
10194 storage_class = sc_none;
10200 /* It's a variable. */
10202 /* An uninitialized decl with `extern' is a reference. */
10203 decl = grokvardecl (type, unqualified_id,
10206 (type_quals & TYPE_QUAL_CONST) != 0,
10207 ctype ? ctype : in_namespace);
10208 bad_specifiers (decl, BSP_VAR, virtualp,
10209 memfn_quals != TYPE_UNQUALIFIED,
10210 inlinep, friendp, raises != NULL_TREE);
10214 DECL_CONTEXT (decl) = ctype;
10217 permerror (input_location, "%<static%> may not be used when defining "
10218 "(as opposed to declaring) a static data member");
10220 storage_class = sc_none;
10222 if (storage_class == sc_register && TREE_STATIC (decl))
10224 error ("static member %qD declared %<register%>", decl);
10225 storage_class = sc_none;
10227 if (storage_class == sc_extern && pedantic)
10229 pedwarn (input_location, OPT_pedantic,
10230 "cannot explicitly declare member %q#D to have "
10231 "extern linkage", decl);
10232 storage_class = sc_none;
10235 else if (constexpr_p && DECL_EXTERNAL (decl))
10237 error ("declaration of constexpr variable %qD is not a definition",
10239 constexpr_p = false;
10243 if (storage_class == sc_extern && initialized && !funcdef_flag)
10245 if (toplevel_bindings_p ())
10247 /* It's common practice (and completely valid) to have a const
10248 be initialized and declared extern. */
10249 if (!(type_quals & TYPE_QUAL_CONST))
10250 warning (0, "%qs initialized and declared %<extern%>", name);
10254 error ("%qs has both %<extern%> and initializer", name);
10255 return error_mark_node;
10259 /* Record `register' declaration for warnings on &
10260 and in case doing stupid register allocation. */
10262 if (storage_class == sc_register)
10263 DECL_REGISTER (decl) = 1;
10264 else if (storage_class == sc_extern)
10265 DECL_THIS_EXTERN (decl) = 1;
10266 else if (storage_class == sc_static)
10267 DECL_THIS_STATIC (decl) = 1;
10269 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10270 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10271 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10273 /* Record constancy and volatility on the DECL itself . There's
10274 no need to do this when processing a template; we'll do this
10275 for the instantiated declaration based on the type of DECL. */
10276 if (!processing_template_decl)
10277 cp_apply_type_quals_to_decl (type_quals, decl);
10283 /* Subroutine of start_function. Ensure that each of the parameter
10284 types (as listed in PARMS) is complete, as is required for a
10285 function definition. */
10288 require_complete_types_for_parms (tree parms)
10290 for (; parms; parms = DECL_CHAIN (parms))
10292 if (dependent_type_p (TREE_TYPE (parms)))
10294 if (!VOID_TYPE_P (TREE_TYPE (parms))
10295 && complete_type_or_else (TREE_TYPE (parms), parms))
10297 relayout_decl (parms);
10298 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10301 /* grokparms or complete_type_or_else will have already issued
10303 TREE_TYPE (parms) = error_mark_node;
10307 /* Returns nonzero if T is a local variable. */
10310 local_variable_p (const_tree t)
10312 if ((TREE_CODE (t) == VAR_DECL
10313 /* A VAR_DECL with a context that is a _TYPE is a static data
10315 && !TYPE_P (CP_DECL_CONTEXT (t))
10316 /* Any other non-local variable must be at namespace scope. */
10317 && !DECL_NAMESPACE_SCOPE_P (t))
10318 || (TREE_CODE (t) == PARM_DECL))
10324 /* Like local_variable_p, but suitable for use as a tree-walking
10328 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10329 void *data ATTRIBUTE_UNUSED)
10331 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10333 else if (TYPE_P (*tp))
10334 *walk_subtrees = 0;
10340 /* Check that ARG, which is a default-argument expression for a
10341 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10342 something goes wrong. DECL may also be a _TYPE node, rather than a
10343 DECL, if there is no DECL available. */
10346 check_default_argument (tree decl, tree arg)
10351 if (TREE_CODE (arg) == DEFAULT_ARG)
10352 /* We get a DEFAULT_ARG when looking at an in-class declaration
10353 with a default argument. Ignore the argument for now; we'll
10354 deal with it after the class is complete. */
10363 decl_type = TREE_TYPE (decl);
10365 if (arg == error_mark_node
10366 || decl == error_mark_node
10367 || TREE_TYPE (arg) == error_mark_node
10368 || decl_type == error_mark_node)
10369 /* Something already went wrong. There's no need to check
10371 return error_mark_node;
10373 /* [dcl.fct.default]
10375 A default argument expression is implicitly converted to the
10377 if (!TREE_TYPE (arg)
10378 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10381 error ("default argument for %q#D has type %qT",
10382 decl, TREE_TYPE (arg));
10384 error ("default argument for parameter of type %qT has type %qT",
10385 decl_type, TREE_TYPE (arg));
10387 return error_mark_node;
10390 /* [dcl.fct.default]
10392 Local variables shall not be used in default argument
10395 The keyword `this' shall not be used in a default argument of a
10396 member function. */
10397 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10400 error ("default argument %qE uses local variable %qD", arg, var);
10401 return error_mark_node;
10408 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10411 type_is_deprecated (tree type)
10413 enum tree_code code;
10414 if (TREE_DEPRECATED (type))
10416 if (TYPE_NAME (type)
10417 && TREE_DEPRECATED (TYPE_NAME (type)))
10420 /* Do warn about using typedefs to a deprecated class. */
10421 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10422 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10424 code = TREE_CODE (type);
10426 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10427 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10428 || code == METHOD_TYPE || code == ARRAY_TYPE)
10429 return type_is_deprecated (TREE_TYPE (type));
10431 if (TYPE_PTRMEMFUNC_P (type))
10432 return type_is_deprecated
10433 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10438 /* Decode the list of parameter types for a function type.
10439 Given the list of things declared inside the parens,
10440 return a list of types.
10442 If this parameter does not end with an ellipsis, we append
10445 *PARMS is set to the chain of PARM_DECLs created. */
10448 grokparms (tree parmlist, tree *parms)
10450 tree result = NULL_TREE;
10451 tree decls = NULL_TREE;
10455 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10457 tree type = NULL_TREE;
10458 tree init = TREE_PURPOSE (parm);
10459 tree decl = TREE_VALUE (parm);
10460 const char *errmsg;
10462 if (parm == void_list_node)
10465 if (! decl || TREE_TYPE (decl) == error_mark_node)
10468 type = TREE_TYPE (decl);
10469 if (VOID_TYPE_P (type))
10471 if (same_type_p (type, void_type_node)
10472 && DECL_SELF_REFERENCE_P (type)
10473 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10474 /* this is a parmlist of `(void)', which is ok. */
10476 cxx_incomplete_type_error (decl, type);
10477 /* It's not a good idea to actually create parameters of
10478 type `void'; other parts of the compiler assume that a
10479 void type terminates the parameter list. */
10480 type = error_mark_node;
10481 TREE_TYPE (decl) = error_mark_node;
10484 if (type != error_mark_node
10485 && TYPE_FOR_JAVA (type)
10486 && MAYBE_CLASS_TYPE_P (type))
10488 error ("parameter %qD has Java class type", decl);
10489 type = error_mark_node;
10490 TREE_TYPE (decl) = error_mark_node;
10494 if (type != error_mark_node
10495 && (errmsg = targetm.invalid_parameter_type (type)))
10498 type = error_mark_node;
10499 TREE_TYPE (decl) = error_mark_node;
10502 if (type != error_mark_node)
10504 if (deprecated_state != DEPRECATED_SUPPRESS)
10506 tree deptype = type_is_deprecated (type);
10508 warn_deprecated_use (deptype, NULL_TREE);
10511 /* Top-level qualifiers on the parameters are
10512 ignored for function types. */
10513 type = cp_build_qualified_type (type, 0);
10514 if (TREE_CODE (type) == METHOD_TYPE)
10516 error ("parameter %qD invalidly declared method type", decl);
10517 type = build_pointer_type (type);
10518 TREE_TYPE (decl) = type;
10520 else if (abstract_virtuals_error (decl, type))
10521 any_error = 1; /* Seems like a good idea. */
10522 else if (POINTER_TYPE_P (type))
10524 /* [dcl.fct]/6, parameter types cannot contain pointers
10525 (references) to arrays of unknown bound. */
10526 tree t = TREE_TYPE (type);
10527 int ptr = TYPE_PTR_P (type);
10531 if (TYPE_PTR_P (t))
10533 else if (TREE_CODE (t) != ARRAY_TYPE)
10535 else if (!TYPE_DOMAIN (t))
10539 if (TREE_CODE (t) == ARRAY_TYPE)
10541 ? G_("parameter %qD includes pointer to array of "
10542 "unknown bound %qT")
10543 : G_("parameter %qD includes reference to array of "
10544 "unknown bound %qT"),
10550 else if (init && !processing_template_decl)
10551 init = check_default_argument (decl, init);
10554 DECL_CHAIN (decl) = decls;
10556 result = tree_cons (init, type, result);
10558 decls = nreverse (decls);
10559 result = nreverse (result);
10561 result = chainon (result, void_list_node);
10568 /* D is a constructor or overloaded `operator='.
10570 Let T be the class in which D is declared. Then, this function
10573 -1 if D's is an ill-formed constructor or copy assignment operator
10574 whose first parameter is of type `T'.
10575 0 if D is not a copy constructor or copy assignment
10577 1 if D is a copy constructor or copy assignment operator whose
10578 first parameter is a reference to non-const qualified T.
10579 2 if D is a copy constructor or copy assignment operator whose
10580 first parameter is a reference to const qualified T.
10582 This function can be used as a predicate. Positive values indicate
10583 a copy constructor and nonzero values indicate a copy assignment
10587 copy_fn_p (const_tree d)
10593 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10595 if (TREE_CODE (d) == TEMPLATE_DECL
10596 || (DECL_TEMPLATE_INFO (d)
10597 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10598 /* Instantiations of template member functions are never copy
10599 functions. Note that member functions of templated classes are
10600 represented as template functions internally, and we must
10601 accept those as copy functions. */
10604 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10608 arg_type = TREE_VALUE (args);
10609 if (arg_type == error_mark_node)
10612 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10614 /* Pass by value copy assignment operator. */
10617 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10618 && !TYPE_REF_IS_RVALUE (arg_type)
10619 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10621 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10627 args = TREE_CHAIN (args);
10629 if (args && args != void_list_node && !TREE_PURPOSE (args))
10630 /* There are more non-optional args. */
10636 /* D is a constructor or overloaded `operator='.
10638 Let T be the class in which D is declared. Then, this function
10639 returns true when D is a move constructor or move assignment
10640 operator, false otherwise. */
10643 move_fn_p (const_tree d)
10647 bool result = false;
10649 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10651 if (cxx_dialect == cxx98)
10652 /* There are no move constructors if we are in C++98 mode. */
10655 if (TREE_CODE (d) == TEMPLATE_DECL
10656 || (DECL_TEMPLATE_INFO (d)
10657 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10658 /* Instantiations of template member functions are never copy
10659 functions. Note that member functions of templated classes are
10660 represented as template functions internally, and we must
10661 accept those as copy functions. */
10664 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10668 arg_type = TREE_VALUE (args);
10669 if (arg_type == error_mark_node)
10672 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10673 && TYPE_REF_IS_RVALUE (arg_type)
10674 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10678 args = TREE_CHAIN (args);
10680 if (args && args != void_list_node && !TREE_PURPOSE (args))
10681 /* There are more non-optional args. */
10687 /* Remember any special properties of member function DECL. */
10690 grok_special_member_properties (tree decl)
10694 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10697 class_type = DECL_CONTEXT (decl);
10698 if (DECL_CONSTRUCTOR_P (decl))
10700 int ctor = copy_fn_p (decl);
10702 if (!DECL_ARTIFICIAL (decl))
10703 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10709 A non-template constructor for class X is a copy
10710 constructor if its first parameter is of type X&, const
10711 X&, volatile X& or const volatile X&, and either there
10712 are no other parameters or else all other parameters have
10713 default arguments. */
10714 TYPE_HAS_COPY_CTOR (class_type) = 1;
10715 if (user_provided_p (decl))
10716 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10718 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10720 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10722 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10723 if (user_provided_p (decl))
10724 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10726 else if (move_fn_p (decl) && user_provided_p (decl))
10727 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10728 else if (is_list_ctor (decl))
10729 TYPE_HAS_LIST_CTOR (class_type) = 1;
10731 if (DECL_DECLARED_CONSTEXPR_P (decl)
10732 && !copy_fn_p (decl) && !move_fn_p (decl))
10733 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10735 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10739 A non-template assignment operator for class X is a copy
10740 assignment operator if its parameter is of type X, X&, const
10741 X&, volatile X& or const volatile X&. */
10743 int assop = copy_fn_p (decl);
10747 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10748 if (user_provided_p (decl))
10749 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10751 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10753 else if (move_fn_p (decl) && user_provided_p (decl))
10754 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10756 /* Destructors are handled in check_methods. */
10759 /* Check a constructor DECL has the correct form. Complains
10760 if the class has a constructor of the form X(X). */
10763 grok_ctor_properties (const_tree ctype, const_tree decl)
10765 int ctor_parm = copy_fn_p (decl);
10771 A declaration of a constructor for a class X is ill-formed if
10772 its first parameter is of type (optionally cv-qualified) X
10773 and either there are no other parameters or else all other
10774 parameters have default arguments.
10776 We *don't* complain about member template instantiations that
10777 have this form, though; they can occur as we try to decide
10778 what constructor to use during overload resolution. Since
10779 overload resolution will never prefer such a constructor to
10780 the non-template copy constructor (which is either explicitly
10781 or implicitly defined), there's no need to worry about their
10782 existence. Theoretically, they should never even be
10783 instantiated, but that's hard to forestall. */
10784 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10792 /* An operator with this code is unary, but can also be binary. */
10795 ambi_op_p (enum tree_code code)
10797 return (code == INDIRECT_REF
10798 || code == ADDR_EXPR
10799 || code == UNARY_PLUS_EXPR
10800 || code == NEGATE_EXPR
10801 || code == PREINCREMENT_EXPR
10802 || code == PREDECREMENT_EXPR);
10805 /* An operator with this name can only be unary. */
10808 unary_op_p (enum tree_code code)
10810 return (code == TRUTH_NOT_EXPR
10811 || code == BIT_NOT_EXPR
10812 || code == COMPONENT_REF
10813 || code == TYPE_EXPR);
10816 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10817 errors are issued for invalid declarations. */
10820 grok_op_properties (tree decl, bool complain)
10822 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10824 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10825 tree name = DECL_NAME (decl);
10826 enum tree_code operator_code;
10831 /* Count the number of arguments and check for ellipsis. */
10832 for (argtype = argtypes, arity = 0;
10833 argtype && argtype != void_list_node;
10834 argtype = TREE_CHAIN (argtype))
10836 ellipsis_p = !argtype;
10838 class_type = DECL_CONTEXT (decl);
10839 if (class_type && !CLASS_TYPE_P (class_type))
10840 class_type = NULL_TREE;
10842 if (DECL_CONV_FN_P (decl))
10843 operator_code = TYPE_EXPR;
10847 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10848 if (ansi_opname (CODE) == name) \
10850 operator_code = (CODE); \
10853 else if (ansi_assopname (CODE) == name) \
10855 operator_code = (CODE); \
10856 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10860 #include "operators.def"
10861 #undef DEF_OPERATOR
10863 gcc_unreachable ();
10866 gcc_assert (operator_code != MAX_TREE_CODES);
10867 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10870 switch (operator_code)
10873 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10877 TYPE_GETS_DELETE (class_type) |= 1;
10881 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10884 case VEC_DELETE_EXPR:
10885 TYPE_GETS_DELETE (class_type) |= 2;
10892 /* [basic.std.dynamic.allocation]/1:
10894 A program is ill-formed if an allocation function is declared
10895 in a namespace scope other than global scope or declared static
10898 The same also holds true for deallocation functions. */
10899 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10900 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10902 if (DECL_NAMESPACE_SCOPE_P (decl))
10904 if (CP_DECL_CONTEXT (decl) != global_namespace)
10906 error ("%qD may not be declared within a namespace", decl);
10909 else if (!TREE_PUBLIC (decl))
10911 error ("%qD may not be declared as static", decl);
10917 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10919 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10920 DECL_IS_OPERATOR_NEW (decl) = 1;
10922 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10923 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10926 /* An operator function must either be a non-static member function
10927 or have at least one parameter of a class, a reference to a class,
10928 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10929 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10931 if (operator_code == TYPE_EXPR
10932 || operator_code == CALL_EXPR
10933 || operator_code == COMPONENT_REF
10934 || operator_code == ARRAY_REF
10935 || operator_code == NOP_EXPR)
10937 error ("%qD must be a nonstatic member function", decl);
10944 if (DECL_STATIC_FUNCTION_P (decl))
10946 error ("%qD must be either a non-static member "
10947 "function or a non-member function", decl);
10951 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10953 tree arg = non_reference (TREE_VALUE (p));
10954 if (arg == error_mark_node)
10957 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10958 because these checks are performed even on
10959 template functions. */
10960 if (MAYBE_CLASS_TYPE_P (arg)
10961 || TREE_CODE (arg) == ENUMERAL_TYPE)
10965 if (!p || p == void_list_node)
10968 error ("%qD must have an argument of class or "
10969 "enumerated type", decl);
10975 /* There are no restrictions on the arguments to an overloaded
10977 if (operator_code == CALL_EXPR)
10980 /* Warn about conversion operators that will never be used. */
10981 if (IDENTIFIER_TYPENAME_P (name)
10982 && ! DECL_TEMPLATE_INFO (decl)
10984 /* Warn only declaring the function; there is no need to
10985 warn again about out-of-class definitions. */
10986 && class_type == current_class_type)
10988 tree t = TREE_TYPE (name);
10989 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10992 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10994 if (TREE_CODE (t) == VOID_TYPE)
10995 warning (OPT_Wconversion,
10997 ? G_("conversion to a reference to void "
10998 "will never use a type conversion operator")
10999 : G_("conversion to void "
11000 "will never use a type conversion operator"));
11001 else if (class_type)
11003 if (t == class_type)
11004 warning (OPT_Wconversion,
11006 ? G_("conversion to a reference to the same type "
11007 "will never use a type conversion operator")
11008 : G_("conversion to the same type "
11009 "will never use a type conversion operator"));
11010 /* Don't force t to be complete here. */
11011 else if (MAYBE_CLASS_TYPE_P (t)
11012 && COMPLETE_TYPE_P (t)
11013 && DERIVED_FROM_P (t, class_type))
11014 warning (OPT_Wconversion,
11016 ? G_("conversion to a reference to a base class "
11017 "will never use a type conversion operator")
11018 : G_("conversion to a base class "
11019 "will never use a type conversion operator"));
11024 if (operator_code == COND_EXPR)
11027 error ("ISO C++ prohibits overloading operator ?:");
11030 else if (ellipsis_p)
11032 error ("%qD must not have variable number of arguments", decl);
11035 else if (ambi_op_p (operator_code))
11038 /* We pick the one-argument operator codes by default, so
11039 we don't have to change anything. */
11041 else if (arity == 2)
11043 /* If we thought this was a unary operator, we now know
11044 it to be a binary operator. */
11045 switch (operator_code)
11048 operator_code = MULT_EXPR;
11052 operator_code = BIT_AND_EXPR;
11055 case UNARY_PLUS_EXPR:
11056 operator_code = PLUS_EXPR;
11060 operator_code = MINUS_EXPR;
11063 case PREINCREMENT_EXPR:
11064 operator_code = POSTINCREMENT_EXPR;
11067 case PREDECREMENT_EXPR:
11068 operator_code = POSTDECREMENT_EXPR;
11072 gcc_unreachable ();
11075 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11077 if ((operator_code == POSTINCREMENT_EXPR
11078 || operator_code == POSTDECREMENT_EXPR)
11079 && ! processing_template_decl
11080 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11083 error ("postfix %qD must take %<int%> as its argument",
11086 error ("postfix %qD must take %<int%> as its second "
11094 error ("%qD must take either zero or one argument", decl);
11096 error ("%qD must take either one or two arguments", decl);
11100 /* More Effective C++ rule 6. */
11102 && (operator_code == POSTINCREMENT_EXPR
11103 || operator_code == POSTDECREMENT_EXPR
11104 || operator_code == PREINCREMENT_EXPR
11105 || operator_code == PREDECREMENT_EXPR))
11107 tree arg = TREE_VALUE (argtypes);
11108 tree ret = TREE_TYPE (TREE_TYPE (decl));
11109 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11110 arg = TREE_TYPE (arg);
11111 arg = TYPE_MAIN_VARIANT (arg);
11112 if (operator_code == PREINCREMENT_EXPR
11113 || operator_code == PREDECREMENT_EXPR)
11115 if (TREE_CODE (ret) != REFERENCE_TYPE
11116 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11118 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11119 build_reference_type (arg));
11123 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11124 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11128 else if (unary_op_p (operator_code))
11133 error ("%qD must take %<void%>", decl);
11135 error ("%qD must take exactly one argument", decl);
11139 else /* if (binary_op_p (operator_code)) */
11144 error ("%qD must take exactly one argument", decl);
11146 error ("%qD must take exactly two arguments", decl);
11150 /* More Effective C++ rule 7. */
11152 && (operator_code == TRUTH_ANDIF_EXPR
11153 || operator_code == TRUTH_ORIF_EXPR
11154 || operator_code == COMPOUND_EXPR))
11155 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11159 /* Effective C++ rule 23. */
11162 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11163 && (operator_code == PLUS_EXPR
11164 || operator_code == MINUS_EXPR
11165 || operator_code == TRUNC_DIV_EXPR
11166 || operator_code == MULT_EXPR
11167 || operator_code == TRUNC_MOD_EXPR)
11168 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11169 warning (OPT_Weffc__, "%qD should return by value", decl);
11171 /* [over.oper]/8 */
11172 for (; argtypes && argtypes != void_list_node;
11173 argtypes = TREE_CHAIN (argtypes))
11174 if (TREE_PURPOSE (argtypes))
11176 TREE_PURPOSE (argtypes) = NULL_TREE;
11177 if (operator_code == POSTINCREMENT_EXPR
11178 || operator_code == POSTDECREMENT_EXPR)
11180 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11185 error ("%qD cannot have default arguments", decl);
11193 /* Return a string giving the keyword associate with CODE. */
11195 static const char *
11196 tag_name (enum tag_types code)
11208 case typename_type:
11211 gcc_unreachable ();
11215 /* Name lookup in an elaborated-type-specifier (after the keyword
11216 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11217 elaborated-type-specifier is invalid, issue a diagnostic and return
11218 error_mark_node; otherwise, return the *_TYPE to which it referred.
11219 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11222 check_elaborated_type_specifier (enum tag_types tag_code,
11224 bool allow_template_p)
11230 struct S { struct S *p; };
11232 name lookup will find the TYPE_DECL for the implicit "S::S"
11233 typedef. Adjust for that here. */
11234 if (DECL_SELF_REFERENCE_P (decl))
11235 decl = TYPE_NAME (TREE_TYPE (decl));
11237 type = TREE_TYPE (decl);
11239 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11240 is false for this case as well. */
11241 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11243 error ("using template type parameter %qT after %qs",
11244 type, tag_name (tag_code));
11245 return error_mark_node;
11249 If the identifier resolves to a typedef-name or a template
11250 type-parameter, the elaborated-type-specifier is ill-formed.
11252 In other words, the only legitimate declaration to use in the
11253 elaborated type specifier is the implicit typedef created when
11254 the type is declared. */
11255 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11256 && !DECL_SELF_REFERENCE_P (decl)
11257 && tag_code != typename_type)
11259 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11260 error ("%q+D has a previous declaration here", decl);
11261 return error_mark_node;
11263 else if (TREE_CODE (type) != RECORD_TYPE
11264 && TREE_CODE (type) != UNION_TYPE
11265 && tag_code != enum_type
11266 && tag_code != typename_type)
11268 error ("%qT referred to as %qs", type, tag_name (tag_code));
11269 error ("%q+T has a previous declaration here", type);
11270 return error_mark_node;
11272 else if (TREE_CODE (type) != ENUMERAL_TYPE
11273 && tag_code == enum_type)
11275 error ("%qT referred to as enum", type);
11276 error ("%q+T has a previous declaration here", type);
11277 return error_mark_node;
11279 else if (!allow_template_p
11280 && TREE_CODE (type) == RECORD_TYPE
11281 && CLASSTYPE_IS_TEMPLATE (type))
11283 /* If a class template appears as elaborated type specifier
11284 without a template header such as:
11286 template <class T> class C {};
11287 void f(class C); // No template header here
11289 then the required template argument is missing. */
11290 error ("template argument required for %<%s %T%>",
11291 tag_name (tag_code),
11292 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11293 return error_mark_node;
11299 /* Lookup NAME in elaborate type specifier in scope according to
11300 SCOPE and issue diagnostics if necessary.
11301 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11302 found, and ERROR_MARK_NODE for type error. */
11305 lookup_and_check_tag (enum tag_types tag_code, tree name,
11306 tag_scope scope, bool template_header_p)
11310 if (scope == ts_global)
11312 /* First try ordinary name lookup, ignoring hidden class name
11313 injected via friend declaration. */
11314 decl = lookup_name_prefer_type (name, 2);
11315 /* If that fails, the name will be placed in the smallest
11316 non-class, non-function-prototype scope according to 3.3.1/5.
11317 We may already have a hidden name declared as friend in this
11318 scope. So lookup again but not ignoring hidden names.
11319 If we find one, that name will be made visible rather than
11320 creating a new tag. */
11322 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11325 decl = lookup_type_scope (name, scope);
11327 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11328 decl = DECL_TEMPLATE_RESULT (decl);
11330 if (decl && TREE_CODE (decl) == TYPE_DECL)
11332 /* Look for invalid nested type:
11336 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11338 error ("%qD has the same name as the class in which it is "
11341 return error_mark_node;
11344 /* Two cases we need to consider when deciding if a class
11345 template is allowed as an elaborated type specifier:
11346 1. It is a self reference to its own class.
11347 2. It comes with a template header.
11351 template <class T> class C {
11352 class C *c1; // DECL_SELF_REFERENCE_P is true
11355 template <class U> class C; // template_header_p is true
11356 template <class T> class C<T>::D {
11357 class C *c2; // DECL_SELF_REFERENCE_P is true
11360 t = check_elaborated_type_specifier (tag_code,
11363 | DECL_SELF_REFERENCE_P (decl));
11366 else if (decl && TREE_CODE (decl) == TREE_LIST)
11368 error ("reference to %qD is ambiguous", name);
11369 print_candidates (decl);
11370 return error_mark_node;
11376 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11377 Define the tag as a forward-reference if it is not defined.
11379 If a declaration is given, process it here, and report an error if
11380 multiple declarations are not identical.
11382 SCOPE is TS_CURRENT when this is also a definition. Only look in
11383 the current frame for the name (since C++ allows new names in any
11384 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11385 declaration. Only look beginning from the current scope outward up
11386 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11388 TEMPLATE_HEADER_P is true when this declaration is preceded by
11389 a set of template parameters. */
11392 xref_tag_1 (enum tag_types tag_code, tree name,
11393 tag_scope scope, bool template_header_p)
11395 enum tree_code code;
11397 tree context = NULL_TREE;
11399 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11405 code = RECORD_TYPE;
11411 code = ENUMERAL_TYPE;
11414 gcc_unreachable ();
11417 /* In case of anonymous name, xref_tag is only called to
11418 make type node and push name. Name lookup is not required. */
11419 if (ANON_AGGRNAME_P (name))
11422 t = lookup_and_check_tag (tag_code, name,
11423 scope, template_header_p);
11425 if (t == error_mark_node)
11426 return error_mark_node;
11428 if (scope != ts_current && t && current_class_type
11429 && template_class_depth (current_class_type)
11430 && template_header_p)
11432 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11433 definition of this tag. Since, in addition, we are currently
11434 processing a (member) template declaration of a template
11435 class, we must be very careful; consider:
11442 { template <class V>
11443 friend struct S1; };
11445 Here, the S2::S1 declaration should not be confused with the
11446 outer declaration. In particular, the inner version should
11447 have a template parameter of level 2, not level 1. This
11448 would be particularly important if the member declaration
11451 template <class V = U> friend struct S1;
11453 say, when we should tsubst into `U' when instantiating
11454 S2. On the other hand, when presented with:
11464 we must find the inner binding eventually. We
11465 accomplish this by making sure that the new type we
11466 create to represent this declaration has the right
11468 context = TYPE_CONTEXT (t);
11474 /* If no such tag is yet defined, create a forward-reference node
11475 and record it as the "definition".
11476 When a real declaration of this type is found,
11477 the forward-reference will be altered into a real type. */
11478 if (code == ENUMERAL_TYPE)
11480 error ("use of enum %q#D without previous declaration", name);
11481 return error_mark_node;
11485 t = make_class_type (code);
11486 TYPE_CONTEXT (t) = context;
11487 t = pushtag (name, t, scope);
11492 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11494 if (!redeclare_class_template (t, current_template_parms))
11495 return error_mark_node;
11497 else if (!processing_template_decl
11498 && CLASS_TYPE_P (t)
11499 && CLASSTYPE_IS_TEMPLATE (t))
11501 error ("redeclaration of %qT as a non-template", t);
11502 error ("previous declaration %q+D", t);
11503 return error_mark_node;
11506 /* Make injected friend class visible. */
11507 if (scope != ts_within_enclosing_non_class
11508 && hidden_name_p (TYPE_NAME (t)))
11510 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11511 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11513 if (TYPE_TEMPLATE_INFO (t))
11515 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11516 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11524 /* Wrapper for xref_tag_1. */
11527 xref_tag (enum tag_types tag_code, tree name,
11528 tag_scope scope, bool template_header_p)
11531 timevar_start (TV_NAME_LOOKUP);
11532 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11533 timevar_stop (TV_NAME_LOOKUP);
11539 xref_tag_from_type (tree old, tree id, tag_scope scope)
11541 enum tag_types tag_kind;
11543 if (TREE_CODE (old) == RECORD_TYPE)
11544 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11546 tag_kind = union_type;
11548 if (id == NULL_TREE)
11549 id = TYPE_IDENTIFIER (old);
11551 return xref_tag (tag_kind, id, scope, false);
11554 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11555 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11556 access_* node, and the TREE_VALUE is the type of the base-class.
11557 Non-NULL TREE_TYPE indicates virtual inheritance.
11559 Returns true if the binfo hierarchy was successfully created,
11560 false if an error was detected. */
11563 xref_basetypes (tree ref, tree base_list)
11566 tree binfo, base_binfo;
11567 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11568 unsigned max_bases = 0; /* Maximum direct bases. */
11570 tree default_access;
11571 tree igo_prev; /* Track Inheritance Graph Order. */
11573 if (ref == error_mark_node)
11576 /* The base of a derived class is private by default, all others are
11578 default_access = (TREE_CODE (ref) == RECORD_TYPE
11579 && CLASSTYPE_DECLARED_CLASS (ref)
11580 ? access_private_node : access_public_node);
11582 /* First, make sure that any templates in base-classes are
11583 instantiated. This ensures that if we call ourselves recursively
11584 we do not get confused about which classes are marked and which
11586 basep = &base_list;
11589 tree basetype = TREE_VALUE (*basep);
11591 if (!(processing_template_decl && uses_template_parms (basetype))
11592 && !complete_type_or_else (basetype, NULL))
11593 /* An incomplete type. Remove it from the list. */
11594 *basep = TREE_CHAIN (*basep);
11598 if (TREE_TYPE (*basep))
11600 if (CLASS_TYPE_P (basetype))
11601 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11602 basep = &TREE_CHAIN (*basep);
11606 TYPE_MARKED_P (ref) = 1;
11608 /* The binfo slot should be empty, unless this is an (ill-formed)
11610 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11612 error ("redefinition of %q#T", ref);
11616 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11618 binfo = make_tree_binfo (max_bases);
11620 TYPE_BINFO (ref) = binfo;
11621 BINFO_OFFSET (binfo) = size_zero_node;
11622 BINFO_TYPE (binfo) = ref;
11624 /* Apply base-class info set up to the variants of this type. */
11625 fixup_type_variants (ref);
11629 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11630 /* An aggregate cannot have baseclasses. */
11631 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11633 if (TREE_CODE (ref) == UNION_TYPE)
11635 error ("derived union %qT invalid", ref);
11642 if (TYPE_FOR_JAVA (ref))
11644 error ("Java class %qT cannot have multiple bases", ref);
11651 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11653 if (TYPE_FOR_JAVA (ref))
11655 error ("Java class %qT cannot have virtual bases", ref);
11660 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11662 tree access = TREE_PURPOSE (base_list);
11663 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11664 tree basetype = TREE_VALUE (base_list);
11666 if (access == access_default_node)
11667 access = default_access;
11669 if (PACK_EXPANSION_P (basetype))
11670 basetype = PACK_EXPANSION_PATTERN (basetype);
11671 if (TREE_CODE (basetype) == TYPE_DECL)
11672 basetype = TREE_TYPE (basetype);
11673 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11675 error ("base type %qT fails to be a struct or class type",
11680 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11681 TYPE_FOR_JAVA (ref) = 1;
11683 base_binfo = NULL_TREE;
11684 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11686 base_binfo = TYPE_BINFO (basetype);
11687 /* The original basetype could have been a typedef'd type. */
11688 basetype = BINFO_TYPE (base_binfo);
11690 /* Inherit flags from the base. */
11691 TYPE_HAS_NEW_OPERATOR (ref)
11692 |= TYPE_HAS_NEW_OPERATOR (basetype);
11693 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11694 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11695 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11696 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11697 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11698 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11699 CLASSTYPE_REPEATED_BASE_P (ref)
11700 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11703 /* We must do this test after we've seen through a typedef
11705 if (TYPE_MARKED_P (basetype))
11707 if (basetype == ref)
11708 error ("recursive type %qT undefined", basetype);
11710 error ("duplicate base type %qT invalid", basetype);
11714 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11715 /* Regenerate the pack expansion for the bases. */
11716 basetype = make_pack_expansion (basetype);
11718 TYPE_MARKED_P (basetype) = 1;
11720 base_binfo = copy_binfo (base_binfo, basetype, ref,
11721 &igo_prev, via_virtual);
11722 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11723 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11725 BINFO_BASE_APPEND (binfo, base_binfo);
11726 BINFO_BASE_ACCESS_APPEND (binfo, access);
11729 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11730 /* If we have space in the vbase vector, we must have shared at
11731 least one of them, and are therefore diamond shaped. */
11732 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11734 /* Unmark all the types. */
11735 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11736 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11737 TYPE_MARKED_P (ref) = 0;
11739 /* Now see if we have a repeated base type. */
11740 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11742 for (base_binfo = binfo; base_binfo;
11743 base_binfo = TREE_CHAIN (base_binfo))
11745 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11747 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11750 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11752 for (base_binfo = binfo; base_binfo;
11753 base_binfo = TREE_CHAIN (base_binfo))
11754 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11755 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11764 /* Copies the enum-related properties from type SRC to type DST.
11765 Used with the underlying type of an enum and the enum itself. */
11767 copy_type_enum (tree dst, tree src)
11769 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11770 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11771 TYPE_SIZE (dst) = TYPE_SIZE (src);
11772 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11773 SET_TYPE_MODE (dst, TYPE_MODE (src));
11774 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11775 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11776 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11777 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11780 /* Begin compiling the definition of an enumeration type.
11783 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11785 UNDERLYING_TYPE is the type that will be used as the storage for
11786 the enumeration type. This should be NULL_TREE if no storage type
11789 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11791 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11793 Returns the type object, as yet incomplete.
11794 Also records info about it so that build_enumerator
11795 may be used to declare the individual values as they are read. */
11798 start_enum (tree name, tree enumtype, tree underlying_type,
11799 bool scoped_enum_p, bool *is_new)
11801 tree prevtype = NULL_TREE;
11802 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11806 /* [C++0x dcl.enum]p5:
11808 If not explicitly specified, the underlying type of a scoped
11809 enumeration type is int. */
11810 if (!underlying_type && scoped_enum_p)
11811 underlying_type = integer_type_node;
11813 if (underlying_type)
11814 underlying_type = cv_unqualified (underlying_type);
11816 /* If this is the real definition for a previous forward reference,
11817 fill in the contents in the same object that used to be the
11818 forward reference. */
11820 enumtype = lookup_and_check_tag (enum_type, name,
11821 /*tag_scope=*/ts_current,
11822 /*template_header_p=*/false);
11824 /* In case of a template_decl, the only check that should be deferred
11825 to instantiation time is the comparison of underlying types. */
11826 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11828 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11830 error_at (input_location, "scoped/unscoped mismatch "
11831 "in enum %q#T", enumtype);
11832 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11833 "previous definition here");
11834 enumtype = error_mark_node;
11836 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11838 error_at (input_location, "underlying type mismatch "
11839 "in enum %q#T", enumtype);
11840 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11841 "previous definition here");
11842 enumtype = error_mark_node;
11844 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11845 && !dependent_type_p (underlying_type)
11846 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11847 && !same_type_p (underlying_type,
11848 ENUM_UNDERLYING_TYPE (enumtype)))
11850 error_at (input_location, "different underlying type "
11851 "in enum %q#T", enumtype);
11852 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11853 "previous definition here");
11854 underlying_type = NULL_TREE;
11858 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11859 || processing_template_decl)
11861 /* In case of error, make a dummy enum to allow parsing to
11863 if (enumtype == error_mark_node)
11865 name = make_anon_name ();
11866 enumtype = NULL_TREE;
11869 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11870 of an opaque enum, or an opaque enum of an already defined
11871 enumeration (C++0x only).
11872 In any other case, it'll be NULL_TREE. */
11878 prevtype = enumtype;
11879 enumtype = cxx_make_type (ENUMERAL_TYPE);
11880 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11881 if (enumtype == error_mark_node)
11882 return error_mark_node;
11884 /* The enum is considered opaque until the opening '{' of the
11885 enumerator list. */
11886 SET_OPAQUE_ENUM_P (enumtype, true);
11887 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11890 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11892 if (underlying_type)
11894 if (CP_INTEGRAL_TYPE_P (underlying_type))
11896 copy_type_enum (enumtype, underlying_type);
11897 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11899 else if (dependent_type_p (underlying_type))
11900 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11902 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11903 underlying_type, enumtype);
11906 /* If into a template class, the returned enum is always the first
11907 declaration (opaque or not) seen. This way all the references to
11908 this type will be to the same declaration. The following ones are used
11909 only to check for definition errors. */
11910 if (prevtype && processing_template_decl)
11916 /* After processing and defining all the values of an enumeration type,
11917 install their decls in the enumeration type.
11918 ENUMTYPE is the type object. */
11921 finish_enum_value_list (tree enumtype)
11924 tree underlying_type;
11927 tree minnode, maxnode;
11930 bool fixed_underlying_type_p
11931 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11933 /* We built up the VALUES in reverse order. */
11934 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11936 /* For an enum defined in a template, just set the type of the values;
11937 all further processing is postponed until the template is
11938 instantiated. We need to set the type so that tsubst of a CONST_DECL
11940 if (processing_template_decl)
11942 for (values = TYPE_VALUES (enumtype);
11944 values = TREE_CHAIN (values))
11945 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11949 /* Determine the minimum and maximum values of the enumerators. */
11950 if (TYPE_VALUES (enumtype))
11952 minnode = maxnode = NULL_TREE;
11954 for (values = TYPE_VALUES (enumtype);
11956 values = TREE_CHAIN (values))
11958 decl = TREE_VALUE (values);
11960 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11961 each enumerator has the type of its enumeration. Prior to the
11962 closing brace, the type of each enumerator is the type of its
11963 initializing value. */
11964 TREE_TYPE (decl) = enumtype;
11966 /* Update the minimum and maximum values, if appropriate. */
11967 value = DECL_INITIAL (decl);
11968 if (value == error_mark_node)
11969 value = integer_zero_node;
11970 /* Figure out what the minimum and maximum values of the
11971 enumerators are. */
11973 minnode = maxnode = value;
11974 else if (tree_int_cst_lt (maxnode, value))
11976 else if (tree_int_cst_lt (value, minnode))
11983 If the enumerator-list is empty, the underlying type is as if
11984 the enumeration had a single enumerator with value 0. */
11985 minnode = maxnode = integer_zero_node;
11987 if (!fixed_underlying_type_p)
11989 /* Compute the number of bits require to represent all values of the
11990 enumeration. We must do this before the type of MINNODE and
11991 MAXNODE are transformed, since tree_int_cst_min_precision relies
11992 on the TREE_TYPE of the value it is passed. */
11993 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11994 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11995 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11996 int precision = MAX (lowprec, highprec);
11998 bool use_short_enum;
12000 /* Determine the underlying type of the enumeration.
12004 The underlying type of an enumeration is an integral type that
12005 can represent all the enumerator values defined in the
12006 enumeration. It is implementation-defined which integral type is
12007 used as the underlying type for an enumeration except that the
12008 underlying type shall not be larger than int unless the value of
12009 an enumerator cannot fit in an int or unsigned int.
12011 We use "int" or an "unsigned int" as the underlying type, even if
12012 a smaller integral type would work, unless the user has
12013 explicitly requested that we use the smallest possible type. The
12014 user can request that for all enumerations with a command line
12015 flag, or for just one enumeration with an attribute. */
12017 use_short_enum = flag_short_enums
12018 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12020 for (itk = (use_short_enum ? itk_char : itk_int);
12024 underlying_type = integer_types[itk];
12025 if (underlying_type != NULL_TREE
12026 && TYPE_PRECISION (underlying_type) >= precision
12027 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12030 if (itk == itk_none)
12034 IF no integral type can represent all the enumerator values, the
12035 enumeration is ill-formed. */
12036 error ("no integral type can represent all of the enumerator values "
12037 "for %qT", enumtype);
12038 precision = TYPE_PRECISION (long_long_integer_type_node);
12039 underlying_type = integer_types[itk_unsigned_long_long];
12044 The value of sizeof() applied to an enumeration type, an object
12045 of an enumeration type, or an enumerator, is the value of sizeof()
12046 applied to the underlying type. */
12047 copy_type_enum (enumtype, underlying_type);
12049 /* Compute the minimum and maximum values for the type.
12053 For an enumeration where emin is the smallest enumerator and emax
12054 is the largest, the values of the enumeration are the values of the
12055 underlying type in the range bmin to bmax, where bmin and bmax are,
12056 respectively, the smallest and largest values of the smallest bit-
12057 field that can store emin and emax. */
12059 /* The middle-end currently assumes that types with TYPE_PRECISION
12060 narrower than their underlying type are suitably zero or sign
12061 extended to fill their mode. Similarly, it assumes that the front
12062 end assures that a value of a particular type must be within
12063 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12065 We used to set these fields based on bmin and bmax, but that led
12066 to invalid assumptions like optimizing away bounds checking. So
12067 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12068 TYPE_MAX_VALUE to the values for the mode above and only restrict
12069 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12070 ENUM_UNDERLYING_TYPE (enumtype)
12071 = build_distinct_type_copy (underlying_type);
12072 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12073 set_min_and_max_values_for_integral_type
12074 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12076 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12077 if (flag_strict_enums)
12078 set_min_and_max_values_for_integral_type (enumtype, precision,
12082 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12084 /* Convert each of the enumerators to the type of the underlying
12085 type of the enumeration. */
12086 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12088 location_t saved_location;
12090 decl = TREE_VALUE (values);
12091 saved_location = input_location;
12092 input_location = DECL_SOURCE_LOCATION (decl);
12093 if (fixed_underlying_type_p)
12094 /* If the enumeration type has a fixed underlying type, we
12095 already checked all of the enumerator values. */
12096 value = DECL_INITIAL (decl);
12098 value = perform_implicit_conversion (underlying_type,
12099 DECL_INITIAL (decl),
12100 tf_warning_or_error);
12101 input_location = saved_location;
12103 /* Do not clobber shared ints. */
12104 value = copy_node (value);
12106 TREE_TYPE (value) = enumtype;
12107 DECL_INITIAL (decl) = value;
12110 /* Fix up all variant types of this enum type. */
12111 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12112 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12114 /* Finish debugging output for this type. */
12115 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12118 /* Finishes the enum type. This is called only the first time an
12119 enumeration is seen, be it opaque or odinary.
12120 ENUMTYPE is the type object. */
12123 finish_enum (tree enumtype)
12125 if (processing_template_decl)
12127 if (at_function_scope_p ())
12128 add_stmt (build_min (TAG_DEFN, enumtype));
12132 /* Here there should not be any variants of this type. */
12133 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12134 && !TYPE_NEXT_VARIANT (enumtype));
12137 /* Build and install a CONST_DECL for an enumeration constant of the
12138 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12139 LOC is the location of NAME.
12140 Assignment of sequential values by default is handled here. */
12143 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12149 /* If the VALUE was erroneous, pretend it wasn't there; that will
12150 result in the enum being assigned the next value in sequence. */
12151 if (value == error_mark_node)
12154 /* Remove no-op casts from the value. */
12156 STRIP_TYPE_NOPS (value);
12158 if (! processing_template_decl)
12160 /* Validate and default VALUE. */
12161 if (value != NULL_TREE)
12163 value = cxx_constant_value (value);
12165 if (TREE_CODE (value) == INTEGER_CST
12166 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12168 value = perform_integral_promotions (value);
12172 error ("enumerator value for %qD is not an integer constant", name);
12177 /* Default based on previous value. */
12178 if (value == NULL_TREE)
12180 if (TYPE_VALUES (enumtype))
12183 unsigned HOST_WIDE_INT lo;
12187 /* C++03 7.2/4: If no initializer is specified for the first
12188 enumerator, the type is an unspecified integral
12189 type. Otherwise the type is the same as the type of the
12190 initializing value of the preceding enumerator unless the
12191 incremented value is not representable in that type, in
12192 which case the type is an unspecified integral type
12193 sufficient to contain the incremented value. */
12194 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12195 if (error_operand_p (prev_value))
12196 value = error_mark_node;
12199 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12200 TREE_INT_CST_HIGH (prev_value),
12205 tree type = TREE_TYPE (prev_value);
12206 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12207 di.low = lo; di.high = hi;
12208 if (!double_int_fits_to_tree_p (type, di))
12211 for (itk = itk_int; itk != itk_none; itk++)
12213 type = integer_types[itk];
12214 if (type != NULL_TREE
12215 && (pos || !TYPE_UNSIGNED (type))
12216 && double_int_fits_to_tree_p (type, di))
12219 if (type && cxx_dialect < cxx0x
12220 && itk > itk_unsigned_long)
12221 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12222 incremented enumerator value is too large for %<unsigned long%>" : "\
12223 incremented enumerator value is too large for %<long%>");
12225 if (type == NULL_TREE)
12228 value = double_int_to_tree (type, di);
12233 error ("overflow in enumeration values at %qD", name);
12234 value = error_mark_node;
12239 value = integer_zero_node;
12242 /* Remove no-op casts from the value. */
12243 STRIP_TYPE_NOPS (value);
12245 /* If the underlying type of the enum is fixed, check whether
12246 the enumerator values fits in the underlying type. If it
12247 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12248 if (ENUM_UNDERLYING_TYPE (enumtype)
12250 && TREE_CODE (value) == INTEGER_CST
12251 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12253 error ("enumerator value %E is too large for underlying type %<%T%>",
12254 value, ENUM_UNDERLYING_TYPE (enumtype));
12256 /* Silently convert the value so that we can continue. */
12257 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12262 /* C++ associates enums with global, function, or class declarations. */
12263 context = current_scope ();
12265 /* Build the actual enumeration constant. Note that the enumeration
12266 constants have the underlying type of the enum (if it is fixed)
12267 or the type of their initializer (if the underlying type of the
12268 enum is not fixed):
12272 If the underlying type is fixed, the type of each enumerator
12273 prior to the closing brace is the underlying type; if the
12274 initializing value of an enumerator cannot be represented by
12275 the underlying type, the program is ill-formed. If the
12276 underlying type is not fixed, the type of each enumerator is
12277 the type of its initializing value.
12279 If the underlying type is not fixed, it will be computed by
12280 finish_enum and we will reset the type of this enumerator. Of
12281 course, if we're processing a template, there may be no value. */
12282 type = value ? TREE_TYPE (value) : NULL_TREE;
12284 if (context && context == current_class_type)
12285 /* This enum declaration is local to the class. We need the full
12286 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12287 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12289 /* It's a global enum, or it's local to a function. (Note local to
12290 a function could mean local to a class method. */
12291 decl = build_decl (loc, CONST_DECL, name, type);
12293 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12294 TREE_CONSTANT (decl) = 1;
12295 TREE_READONLY (decl) = 1;
12296 DECL_INITIAL (decl) = value;
12298 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12299 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12300 on the TYPE_FIELDS list for `S'. (That's so that you can say
12301 things like `S::i' later.) */
12302 finish_member_declaration (decl);
12306 /* Add this enumeration constant to the list for this type. */
12307 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12310 /* Look for an enumerator with the given NAME within the enumeration
12311 type ENUMTYPE. This routine is used primarily for qualified name
12312 lookup into an enumerator in C++0x, e.g.,
12314 enum class Color { Red, Green, Blue };
12316 Color color = Color::Red;
12318 Returns the value corresponding to the enumerator, or
12319 NULL_TREE if no such enumerator was found. */
12321 lookup_enumerator (tree enumtype, tree name)
12324 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12326 e = purpose_member (name, TYPE_VALUES (enumtype));
12327 return e? TREE_VALUE (e) : NULL_TREE;
12331 /* We're defining DECL. Make sure that its type is OK. */
12334 check_function_type (tree decl, tree current_function_parms)
12336 tree fntype = TREE_TYPE (decl);
12337 tree return_type = complete_type (TREE_TYPE (fntype));
12339 /* In a function definition, arg types must be complete. */
12340 require_complete_types_for_parms (current_function_parms);
12342 if (dependent_type_p (return_type))
12344 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12345 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12347 tree args = TYPE_ARG_TYPES (fntype);
12349 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12350 error ("return type %q#T is incomplete", return_type);
12352 error ("return type has Java class type %q#T", return_type);
12354 /* Make it return void instead. */
12355 if (TREE_CODE (fntype) == METHOD_TYPE)
12356 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12358 TREE_CHAIN (args));
12360 fntype = build_function_type (void_type_node, args);
12362 = build_exception_variant (fntype,
12363 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12364 fntype = (cp_build_type_attribute_variant
12365 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12366 TREE_TYPE (decl) = fntype;
12369 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12372 /* Create the FUNCTION_DECL for a function definition.
12373 DECLSPECS and DECLARATOR are the parts of the declaration;
12374 they describe the function's name and the type it returns,
12375 but twisted together in a fashion that parallels the syntax of C.
12377 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12378 DECLARATOR is really the DECL for the function we are about to
12379 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12380 indicating that the function is an inline defined in-class.
12382 This function creates a binding context for the function body
12383 as well as setting up the FUNCTION_DECL in current_function_decl.
12385 For C++, we must first check whether that datum makes any sense.
12386 For example, "class A local_a(1,2);" means that variable local_a
12387 is an aggregate of type A, which should have a constructor
12388 applied to it with the argument list [1, 2].
12390 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12391 or may be a BLOCK if the function has been defined previously
12392 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12393 error_mark_node if the function has never been defined, or
12394 a BLOCK if the function has been defined somewhere. */
12397 start_preparsed_function (tree decl1, tree attrs, int flags)
12399 tree ctype = NULL_TREE;
12402 int doing_friend = 0;
12403 struct cp_binding_level *bl;
12404 tree current_function_parms;
12405 struct c_fileinfo *finfo
12406 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12407 bool honor_interface;
12409 /* Sanity check. */
12410 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12411 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12413 fntype = TREE_TYPE (decl1);
12414 if (TREE_CODE (fntype) == METHOD_TYPE)
12415 ctype = TYPE_METHOD_BASETYPE (fntype);
12417 /* ISO C++ 11.4/5. A friend function defined in a class is in
12418 the (lexical) scope of the class in which it is defined. */
12419 if (!ctype && DECL_FRIEND_P (decl1))
12421 ctype = DECL_FRIEND_CONTEXT (decl1);
12423 /* CTYPE could be null here if we're dealing with a template;
12424 for example, `inline friend float foo()' inside a template
12425 will have no CTYPE set. */
12426 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12432 if (DECL_DECLARED_INLINE_P (decl1)
12433 && lookup_attribute ("noinline", attrs))
12434 warning (0, "inline function %q+D given attribute noinline", decl1);
12436 /* Handle gnu_inline attribute. */
12437 if (GNU_INLINE_P (decl1))
12439 DECL_EXTERNAL (decl1) = 1;
12440 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12441 DECL_INTERFACE_KNOWN (decl1) = 1;
12442 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12445 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12446 /* This is a constructor, we must ensure that any default args
12447 introduced by this definition are propagated to the clones
12448 now. The clones are used directly in overload resolution. */
12449 adjust_clone_args (decl1);
12451 /* Sometimes we don't notice that a function is a static member, and
12452 build a METHOD_TYPE for it. Fix that up now. */
12453 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12454 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12456 /* Set up current_class_type, and enter the scope of the class, if
12459 push_nested_class (ctype);
12460 else if (DECL_STATIC_FUNCTION_P (decl1))
12461 push_nested_class (DECL_CONTEXT (decl1));
12463 /* Now that we have entered the scope of the class, we must restore
12464 the bindings for any template parameters surrounding DECL1, if it
12465 is an inline member template. (Order is important; consider the
12466 case where a template parameter has the same name as a field of
12467 the class.) It is not until after this point that
12468 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12469 if (flags & SF_INCLASS_INLINE)
12470 maybe_begin_member_template_processing (decl1);
12472 /* Effective C++ rule 15. */
12474 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12475 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12476 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12478 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12479 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12480 if (!DECL_INITIAL (decl1))
12481 DECL_INITIAL (decl1) = error_mark_node;
12483 /* This function exists in static storage.
12484 (This does not mean `static' in the C sense!) */
12485 TREE_STATIC (decl1) = 1;
12487 /* We must call push_template_decl after current_class_type is set
12488 up. (If we are processing inline definitions after exiting a
12489 class scope, current_class_type will be NULL_TREE until set above
12490 by push_nested_class.) */
12491 if (processing_template_decl)
12493 /* FIXME: Handle error_mark_node more gracefully. */
12494 tree newdecl1 = push_template_decl (decl1);
12495 if (newdecl1 != error_mark_node)
12499 /* We are now in the scope of the function being defined. */
12500 current_function_decl = decl1;
12502 /* Save the parm names or decls from this function's declarator
12503 where store_parm_decls will find them. */
12504 current_function_parms = DECL_ARGUMENTS (decl1);
12506 /* Make sure the parameter and return types are reasonable. When
12507 you declare a function, these types can be incomplete, but they
12508 must be complete when you define the function. */
12509 check_function_type (decl1, current_function_parms);
12511 /* Build the return declaration for the function. */
12512 restype = TREE_TYPE (fntype);
12513 if (DECL_RESULT (decl1) == NULL_TREE)
12517 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12518 DECL_ARTIFICIAL (resdecl) = 1;
12519 DECL_IGNORED_P (resdecl) = 1;
12520 DECL_RESULT (decl1) = resdecl;
12522 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12525 /* Let the user know we're compiling this function. */
12526 announce_function (decl1);
12528 /* Record the decl so that the function name is defined.
12529 If we already have a decl for this name, and it is a FUNCTION_DECL,
12530 use the old decl. */
12531 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12533 /* A specialization is not used to guide overload resolution. */
12534 if (!DECL_FUNCTION_MEMBER_P (decl1)
12535 && !(DECL_USE_TEMPLATE (decl1) &&
12536 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12538 tree olddecl = pushdecl (decl1);
12540 if (olddecl == error_mark_node)
12541 /* If something went wrong when registering the declaration,
12542 use DECL1; we have to have a FUNCTION_DECL to use when
12543 parsing the body of the function. */
12547 /* Otherwise, OLDDECL is either a previous declaration
12548 of the same function or DECL1 itself. */
12550 if (warn_missing_declarations
12551 && olddecl == decl1
12552 && !DECL_MAIN_P (decl1)
12553 && TREE_PUBLIC (decl1)
12554 && !DECL_DECLARED_INLINE_P (decl1))
12558 /* Check whether DECL1 is in an anonymous
12560 for (context = DECL_CONTEXT (decl1);
12562 context = DECL_CONTEXT (context))
12564 if (TREE_CODE (context) == NAMESPACE_DECL
12565 && DECL_NAME (context) == NULL_TREE)
12569 if (context == NULL)
12570 warning (OPT_Wmissing_declarations,
12571 "no previous declaration for %q+D", decl1);
12579 /* We need to set the DECL_CONTEXT. */
12580 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12581 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12583 fntype = TREE_TYPE (decl1);
12585 /* If #pragma weak applies, mark the decl appropriately now.
12586 The pragma only applies to global functions. Because
12587 determining whether or not the #pragma applies involves
12588 computing the mangled name for the declaration, we cannot
12589 apply the pragma until after we have merged this declaration
12590 with any previous declarations; if the original declaration
12591 has a linkage specification, that specification applies to
12592 the definition as well, and may affect the mangled name. */
12593 if (DECL_FILE_SCOPE_P (decl1))
12594 maybe_apply_pragma_weak (decl1);
12597 /* constexpr functions must have literal argument types and
12598 literal return type. */
12599 validate_constexpr_fundecl (decl1);
12601 /* Reset this in case the call to pushdecl changed it. */
12602 current_function_decl = decl1;
12604 gcc_assert (DECL_INITIAL (decl1));
12606 /* This function may already have been parsed, in which case just
12607 return; our caller will skip over the body without parsing. */
12608 if (DECL_INITIAL (decl1) != error_mark_node)
12611 /* Initialize RTL machinery. We cannot do this until
12612 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12613 even when processing a template; this is how we get
12614 CFUN set up, and our per-function variables initialized.
12615 FIXME factor out the non-RTL stuff. */
12616 bl = current_binding_level;
12617 allocate_struct_function (decl1, processing_template_decl);
12619 /* Initialize the language data structures. Whenever we start
12620 a new function, we destroy temporaries in the usual way. */
12621 cfun->language = ggc_alloc_cleared_language_function ();
12622 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12623 current_binding_level = bl;
12625 /* Start the statement-tree, start the tree now. */
12626 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12628 /* If we are (erroneously) defining a function that we have already
12629 defined before, wipe out what we knew before. */
12630 if (!DECL_PENDING_INLINE_P (decl1))
12631 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12633 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12635 /* We know that this was set up by `grokclassfn'. We do not
12636 wait until `store_parm_decls', since evil parse errors may
12637 never get us to that point. Here we keep the consistency
12638 between `current_class_type' and `current_class_ptr'. */
12639 tree t = DECL_ARGUMENTS (decl1);
12641 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12642 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12644 cp_function_chain->x_current_class_ref
12645 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12646 cp_function_chain->x_current_class_ptr = t;
12648 /* Constructors and destructors need to know whether they're "in
12649 charge" of initializing virtual base classes. */
12650 t = DECL_CHAIN (t);
12651 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12653 current_in_charge_parm = t;
12654 t = DECL_CHAIN (t);
12656 if (DECL_HAS_VTT_PARM_P (decl1))
12658 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12659 current_vtt_parm = t;
12663 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12664 /* Implicitly-defined methods (like the
12665 destructor for a class in which no destructor
12666 is explicitly declared) must not be defined
12667 until their definition is needed. So, we
12668 ignore interface specifications for
12669 compiler-generated functions. */
12670 && !DECL_ARTIFICIAL (decl1));
12672 if (DECL_INTERFACE_KNOWN (decl1))
12674 tree ctx = decl_function_context (decl1);
12676 if (DECL_NOT_REALLY_EXTERN (decl1))
12677 DECL_EXTERNAL (decl1) = 0;
12679 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12680 && TREE_PUBLIC (ctx))
12681 /* This is a function in a local class in an extern inline
12683 comdat_linkage (decl1);
12685 /* If this function belongs to an interface, it is public.
12686 If it belongs to someone else's interface, it is also external.
12687 This only affects inlines and template instantiations. */
12688 else if (!finfo->interface_unknown && honor_interface)
12690 if (DECL_DECLARED_INLINE_P (decl1)
12691 || DECL_TEMPLATE_INSTANTIATION (decl1)
12692 || processing_template_decl)
12694 DECL_EXTERNAL (decl1)
12695 = (finfo->interface_only
12696 || (DECL_DECLARED_INLINE_P (decl1)
12697 && ! flag_implement_inlines
12698 && !DECL_VINDEX (decl1)));
12700 /* For WIN32 we also want to put these in linkonce sections. */
12701 maybe_make_one_only (decl1);
12704 DECL_EXTERNAL (decl1) = 0;
12705 DECL_INTERFACE_KNOWN (decl1) = 1;
12706 /* If this function is in an interface implemented in this file,
12707 make sure that the back end knows to emit this function
12709 if (!DECL_EXTERNAL (decl1))
12710 mark_needed (decl1);
12712 else if (finfo->interface_unknown && finfo->interface_only
12713 && honor_interface)
12715 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12716 interface, we will have both finfo->interface_unknown and
12717 finfo->interface_only set. In that case, we don't want to
12718 use the normal heuristics because someone will supply a
12719 #pragma implementation elsewhere, and deducing it here would
12720 produce a conflict. */
12721 comdat_linkage (decl1);
12722 DECL_EXTERNAL (decl1) = 0;
12723 DECL_INTERFACE_KNOWN (decl1) = 1;
12724 DECL_DEFER_OUTPUT (decl1) = 1;
12728 /* This is a definition, not a reference.
12729 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12730 if (!GNU_INLINE_P (decl1))
12731 DECL_EXTERNAL (decl1) = 0;
12733 if ((DECL_DECLARED_INLINE_P (decl1)
12734 || DECL_TEMPLATE_INSTANTIATION (decl1))
12735 && ! DECL_INTERFACE_KNOWN (decl1))
12736 DECL_DEFER_OUTPUT (decl1) = 1;
12738 DECL_INTERFACE_KNOWN (decl1) = 1;
12741 /* Determine the ELF visibility attribute for the function. We must not
12742 do this before calling "pushdecl", as we must allow "duplicate_decls"
12743 to merge any attributes appropriately. We also need to wait until
12745 if (!DECL_CLONED_FUNCTION_P (decl1))
12746 determine_visibility (decl1);
12748 begin_scope (sk_function_parms, decl1);
12752 if (DECL_DESTRUCTOR_P (decl1)
12753 || (DECL_CONSTRUCTOR_P (decl1)
12754 && targetm.cxx.cdtor_returns_this ()))
12756 cdtor_label = build_decl (input_location,
12757 LABEL_DECL, NULL_TREE, NULL_TREE);
12758 DECL_CONTEXT (cdtor_label) = current_function_decl;
12761 start_fname_decls ();
12763 store_parm_decls (current_function_parms);
12767 /* Like start_preparsed_function, except that instead of a
12768 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12770 Returns 1 on success. If the DECLARATOR is not suitable for a function
12771 (it defines a datum instead), we return 0, which tells
12772 yyparse to report a parse error. */
12775 start_function (cp_decl_specifier_seq *declspecs,
12776 const cp_declarator *declarator,
12781 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12782 if (decl1 == error_mark_node)
12784 /* If the declarator is not suitable for a function definition,
12785 cause a syntax error. */
12786 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12788 error ("invalid function declaration");
12792 if (DECL_MAIN_P (decl1))
12793 /* main must return int. grokfndecl should have corrected it
12794 (and issued a diagnostic) if the user got it wrong. */
12795 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12796 integer_type_node));
12798 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12803 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12807 use_eh_spec_block (tree fn)
12809 return (flag_exceptions && flag_enforce_eh_specs
12810 && !processing_template_decl
12811 && !type_throw_all_p (TREE_TYPE (fn))
12812 /* We insert the EH_SPEC_BLOCK only in the original
12813 function; then, it is copied automatically to the
12815 && !DECL_CLONED_FUNCTION_P (fn)
12816 /* Implicitly-generated constructors and destructors have
12817 exception specifications. However, those specifications
12818 are the union of the possible exceptions specified by the
12819 constructors/destructors for bases and members, so no
12820 unallowed exception will ever reach this function. By
12821 not creating the EH_SPEC_BLOCK we save a little memory,
12822 and we avoid spurious warnings about unreachable
12824 && !DECL_DEFAULTED_FN (fn));
12827 /* Store the parameter declarations into the current function declaration.
12828 This is called after parsing the parameter declarations, before
12829 digesting the body of the function.
12831 Also install to binding contour return value identifier, if any. */
12834 store_parm_decls (tree current_function_parms)
12836 tree fndecl = current_function_decl;
12839 /* This is a chain of any other decls that came in among the parm
12840 declarations. If a parm is declared with enum {foo, bar} x;
12841 then CONST_DECLs for foo and bar are put here. */
12842 tree nonparms = NULL_TREE;
12844 if (current_function_parms)
12846 /* This case is when the function was defined with an ANSI prototype.
12847 The parms already have decls, so we need not do anything here
12848 except record them as in effect
12849 and complain if any redundant old-style parm decls were written. */
12851 tree specparms = current_function_parms;
12854 /* Must clear this because it might contain TYPE_DECLs declared
12856 current_binding_level->names = NULL;
12858 /* If we're doing semantic analysis, then we'll call pushdecl
12859 for each of these. We must do them in reverse order so that
12860 they end in the correct forward order. */
12861 specparms = nreverse (specparms);
12863 for (parm = specparms; parm; parm = next)
12865 next = DECL_CHAIN (parm);
12866 if (TREE_CODE (parm) == PARM_DECL)
12868 if (DECL_NAME (parm) == NULL_TREE
12869 || TREE_CODE (parm) != VOID_TYPE)
12872 error ("parameter %qD declared void", parm);
12876 /* If we find an enum constant or a type tag,
12877 put it aside for the moment. */
12878 TREE_CHAIN (parm) = NULL_TREE;
12879 nonparms = chainon (nonparms, parm);
12883 /* Get the decls in their original chain order and record in the
12884 function. This is all and only the PARM_DECLs that were
12885 pushed into scope by the loop above. */
12886 DECL_ARGUMENTS (fndecl) = getdecls ();
12889 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12891 /* Now store the final chain of decls for the arguments
12892 as the decl-chain of the current lexical scope.
12893 Put the enumerators in as well, at the front so that
12894 DECL_ARGUMENTS is not modified. */
12895 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12897 if (use_eh_spec_block (current_function_decl))
12898 current_eh_spec_block = begin_eh_spec_block ();
12902 /* We have finished doing semantic analysis on DECL, but have not yet
12903 generated RTL for its body. Save away our current state, so that
12904 when we want to generate RTL later we know what to do. */
12907 save_function_data (tree decl)
12909 struct language_function *f;
12911 /* Save the language-specific per-function data so that we can
12912 get it back when we really expand this function. */
12913 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12916 f = ggc_alloc_language_function ();
12917 memcpy (f, cp_function_chain, sizeof (struct language_function));
12918 DECL_SAVED_FUNCTION_DATA (decl) = f;
12920 /* Clear out the bits we don't need. */
12921 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12922 f->bindings = NULL;
12923 f->x_local_names = NULL;
12927 /* Set the return value of the constructor (if present). */
12930 finish_constructor_body (void)
12935 if (targetm.cxx.cdtor_returns_this ()
12936 && (! TYPE_FOR_JAVA (current_class_type)))
12938 /* Any return from a constructor will end up here. */
12939 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12941 val = DECL_ARGUMENTS (current_function_decl);
12942 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12943 DECL_RESULT (current_function_decl), val);
12944 /* Return the address of the object. */
12945 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12946 add_stmt (exprstmt);
12950 /* Do all the processing for the beginning of a destructor; set up the
12951 vtable pointers and cleanups for bases and members. */
12954 begin_destructor_body (void)
12956 tree compound_stmt;
12958 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12959 issued an error message. We still want to try to process the
12960 body of the function, but initialize_vtbl_ptrs will crash if
12961 TYPE_BINFO is NULL. */
12962 if (COMPLETE_TYPE_P (current_class_type))
12964 compound_stmt = begin_compound_stmt (0);
12965 /* Make all virtual function table pointers in non-virtual base
12966 classes point to CURRENT_CLASS_TYPE's virtual function
12968 initialize_vtbl_ptrs (current_class_ptr);
12969 finish_compound_stmt (compound_stmt);
12971 /* And insert cleanups for our bases and members so that they
12972 will be properly destroyed if we throw. */
12973 push_base_cleanups ();
12977 /* At the end of every destructor we generate code to delete the object if
12978 necessary. Do that now. */
12981 finish_destructor_body (void)
12985 /* Any return from a destructor will end up here; that way all base
12986 and member cleanups will be run when the function returns. */
12987 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12989 /* In a virtual destructor, we must call delete. */
12990 if (DECL_VIRTUAL_P (current_function_decl))
12993 tree virtual_size = cxx_sizeof (current_class_type);
12997 At the point of definition of a virtual destructor (including
12998 an implicit definition), non-placement operator delete shall
12999 be looked up in the scope of the destructor's class and if
13000 found shall be accessible and unambiguous. */
13001 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13003 /*global_p=*/false,
13004 /*placement=*/NULL_TREE,
13005 /*alloc_fn=*/NULL_TREE);
13007 if_stmt = begin_if_stmt ();
13008 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13009 current_in_charge_parm,
13012 finish_expr_stmt (exprstmt);
13013 finish_then_clause (if_stmt);
13014 finish_if_stmt (if_stmt);
13017 if (targetm.cxx.cdtor_returns_this ())
13021 val = DECL_ARGUMENTS (current_function_decl);
13022 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13023 DECL_RESULT (current_function_decl), val);
13024 /* Return the address of the object. */
13025 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13026 add_stmt (exprstmt);
13030 /* Do the necessary processing for the beginning of a function body, which
13031 in this case includes member-initializers, but not the catch clauses of
13032 a function-try-block. Currently, this means opening a binding level
13033 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
13036 begin_function_body (void)
13040 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13043 if (processing_template_decl)
13044 /* Do nothing now. */;
13046 /* Always keep the BLOCK node associated with the outermost pair of
13047 curly braces of a function. These are needed for correct
13048 operation of dwarfout.c. */
13049 keep_next_level (true);
13051 stmt = begin_compound_stmt (BCS_FN_BODY);
13053 if (processing_template_decl)
13054 /* Do nothing now. */;
13055 else if (DECL_DESTRUCTOR_P (current_function_decl))
13056 begin_destructor_body ();
13061 /* Do the processing for the end of a function body. Currently, this means
13062 closing out the cleanups for fully-constructed bases and members, and in
13063 the case of the destructor, deleting the object if desired. Again, this
13064 is only meaningful for [cd]tors, since they are the only functions where
13065 there is a significant distinction between the main body and any
13066 function catch clauses. Handling, say, main() return semantics here
13067 would be wrong, as flowing off the end of a function catch clause for
13068 main() would also need to return 0. */
13071 finish_function_body (tree compstmt)
13073 if (compstmt == NULL_TREE)
13076 /* Close the block. */
13077 finish_compound_stmt (compstmt);
13079 if (processing_template_decl)
13080 /* Do nothing now. */;
13081 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13082 finish_constructor_body ();
13083 else if (DECL_DESTRUCTOR_P (current_function_decl))
13084 finish_destructor_body ();
13087 /* Given a function, returns the BLOCK corresponding to the outermost level
13088 of curly braces, skipping the artificial block created for constructor
13092 outer_curly_brace_block (tree fndecl)
13094 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13095 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13096 /* Skip the artificial function body block. */
13097 block = BLOCK_SUBBLOCKS (block);
13101 /* If FNDECL is a class's key method, add the class to the list of
13102 keyed classes that should be emitted. */
13105 record_key_method_defined (tree fndecl)
13107 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13108 && DECL_VIRTUAL_P (fndecl)
13109 && !processing_template_decl)
13111 tree fnclass = DECL_CONTEXT (fndecl);
13112 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13113 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13117 /* Subroutine of finish_function.
13118 Save the body of constexpr functions for possible
13119 future compile time evaluation. */
13122 maybe_save_function_definition (tree fun)
13124 if (!processing_template_decl
13125 && DECL_DECLARED_CONSTEXPR_P (fun)
13126 && !DECL_CLONED_FUNCTION_P (fun))
13127 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13130 /* Finish up a function declaration and compile that function
13131 all the way to assembler language output. The free the storage
13132 for the function definition.
13134 FLAGS is a bitwise or of the following values:
13136 We just finished processing the body of an in-class inline
13137 function definition. (This processing will have taken place
13138 after the class definition is complete.) */
13141 finish_function (int flags)
13143 tree fndecl = current_function_decl;
13144 tree fntype, ctype = NULL_TREE;
13145 int inclass_inline = (flags & 2) != 0;
13147 /* When we get some parse errors, we can end up without a
13148 current_function_decl, so cope. */
13149 if (fndecl == NULL_TREE)
13150 return error_mark_node;
13152 if (c_dialect_objc ())
13153 objc_finish_function ();
13155 gcc_assert (!defer_mark_used_calls);
13156 defer_mark_used_calls = true;
13158 record_key_method_defined (fndecl);
13160 fntype = TREE_TYPE (fndecl);
13162 /* TREE_READONLY (fndecl) = 1;
13163 This caused &foo to be of type ptr-to-const-function
13164 which then got a warning when stored in a ptr-to-function variable. */
13166 gcc_assert (building_stmt_tree ());
13167 /* The current function is being defined, so its DECL_INITIAL should
13168 be set, and unless there's a multiple definition, it should be
13169 error_mark_node. */
13170 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13172 /* For a cloned function, we've already got all the code we need;
13173 there's no need to add any extra bits. */
13174 if (!DECL_CLONED_FUNCTION_P (fndecl))
13176 if (DECL_MAIN_P (current_function_decl))
13180 /* Make it so that `main' always returns 0 by default (or
13183 stmt = finish_return_stmt (integer_one_node);
13185 stmt = finish_return_stmt (integer_zero_node);
13187 /* Hack. We don't want the middle-end to warn that this
13188 return is unreachable, so put the statement on the
13191 location_t linezero = linemap_line_start (line_table, 0, 1);
13192 SET_EXPR_LOCATION (stmt, linezero);
13196 if (use_eh_spec_block (current_function_decl))
13197 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13198 (TREE_TYPE (current_function_decl)),
13199 current_eh_spec_block);
13202 /* If we're saving up tree structure, tie off the function now. */
13203 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13205 finish_fname_decls ();
13207 /* If this function can't throw any exceptions, remember that. */
13208 if (!processing_template_decl
13209 && !cp_function_chain->can_throw
13210 && !flag_non_call_exceptions
13211 && !decl_replaceable_p (fndecl))
13212 TREE_NOTHROW (fndecl) = 1;
13214 /* This must come after expand_function_end because cleanups might
13215 have declarations (from inline functions) that need to go into
13216 this function's blocks. */
13218 /* If the current binding level isn't the outermost binding level
13219 for this function, either there is a bug, or we have experienced
13220 syntax errors and the statement tree is malformed. */
13221 if (current_binding_level->kind != sk_function_parms)
13223 /* Make sure we have already experienced errors. */
13224 gcc_assert (errorcount);
13226 /* Throw away the broken statement tree and extra binding
13228 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13230 while (current_binding_level->kind != sk_function_parms)
13232 if (current_binding_level->kind == sk_class)
13233 pop_nested_class ();
13235 poplevel (0, 0, 0);
13238 poplevel (1, 0, 1);
13240 /* Statements should always be full-expressions at the outermost set
13241 of curly braces for a function. */
13242 gcc_assert (stmts_are_full_exprs_p ());
13244 /* Save constexpr function body before it gets munged by
13245 the NRV transformation. */
13246 maybe_save_function_definition (fndecl);
13248 /* Set up the named return value optimization, if we can. Candidate
13249 variables are selected in check_return_expr. */
13250 if (current_function_return_value)
13252 tree r = current_function_return_value;
13255 if (r != error_mark_node
13256 /* This is only worth doing for fns that return in memory--and
13257 simpler, since we don't have to worry about promoted modes. */
13258 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13259 /* Only allow this for variables declared in the outer scope of
13260 the function so we know that their lifetime always ends with a
13261 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13262 we were to do this optimization in tree-ssa. */
13263 && (outer = outer_curly_brace_block (fndecl))
13264 && chain_member (r, BLOCK_VARS (outer)))
13265 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13267 current_function_return_value = NULL_TREE;
13270 /* Remember that we were in class scope. */
13271 if (current_class_name)
13272 ctype = current_class_type;
13274 /* Must mark the RESULT_DECL as being in this function. */
13275 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13277 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13278 to the FUNCTION_DECL node itself. */
13279 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13281 /* Save away current state, if appropriate. */
13282 if (!processing_template_decl)
13283 save_function_data (fndecl);
13285 /* Complain if there's just no return statement. */
13286 if (warn_return_type
13287 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13288 && !dependent_type_p (TREE_TYPE (fntype))
13289 && !current_function_returns_value && !current_function_returns_null
13290 /* Don't complain if we abort or throw. */
13291 && !current_function_returns_abnormally
13292 /* Don't complain if we are declared noreturn. */
13293 && !TREE_THIS_VOLATILE (fndecl)
13294 && !DECL_NAME (DECL_RESULT (fndecl))
13295 && !TREE_NO_WARNING (fndecl)
13296 /* Structor return values (if any) are set by the compiler. */
13297 && !DECL_CONSTRUCTOR_P (fndecl)
13298 && !DECL_DESTRUCTOR_P (fndecl))
13300 warning (OPT_Wreturn_type,
13301 "no return statement in function returning non-void");
13302 TREE_NO_WARNING (fndecl) = 1;
13305 /* Store the end of the function, so that we get good line number
13306 info for the epilogue. */
13307 cfun->function_end_locus = input_location;
13309 /* Complain about parameters that are only set, but never otherwise used. */
13310 if (warn_unused_but_set_parameter
13311 && !processing_template_decl
13312 && errorcount == unused_but_set_errorcount
13313 && !DECL_CLONED_FUNCTION_P (fndecl))
13317 for (decl = DECL_ARGUMENTS (fndecl);
13319 decl = DECL_CHAIN (decl))
13320 if (TREE_USED (decl)
13321 && TREE_CODE (decl) == PARM_DECL
13322 && !DECL_READ_P (decl)
13323 && DECL_NAME (decl)
13324 && !DECL_ARTIFICIAL (decl)
13325 && !TREE_NO_WARNING (decl)
13326 && !DECL_IN_SYSTEM_HEADER (decl)
13327 && TREE_TYPE (decl) != error_mark_node
13328 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13329 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13330 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13331 warning (OPT_Wunused_but_set_parameter,
13332 "parameter %q+D set but not used", decl);
13333 unused_but_set_errorcount = errorcount;
13336 /* Genericize before inlining. */
13337 if (!processing_template_decl)
13339 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13340 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13341 cp_genericize (fndecl);
13342 /* Clear out the bits we don't need. */
13343 f->x_current_class_ptr = NULL;
13344 f->x_current_class_ref = NULL;
13345 f->x_eh_spec_block = NULL;
13346 f->x_in_charge_parm = NULL;
13347 f->x_vtt_parm = NULL;
13348 f->x_return_value = NULL;
13349 f->bindings = NULL;
13350 f->extern_decl_map = NULL;
13352 /* Clear out the bits we don't need. */
13353 local_names = NULL;
13355 /* We're leaving the context of this function, so zap cfun. It's still in
13356 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13358 current_function_decl = NULL;
13360 /* If this is an in-class inline definition, we may have to pop the
13361 bindings for the template parameters that we added in
13362 maybe_begin_member_template_processing when start_function was
13364 if (inclass_inline)
13365 maybe_end_member_template_processing ();
13367 /* Leave the scope of the class. */
13369 pop_nested_class ();
13374 current_function_decl = NULL_TREE;
13376 defer_mark_used_calls = false;
13377 if (deferred_mark_used_calls)
13382 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13384 VEC_free (tree, gc, deferred_mark_used_calls);
13390 /* Create the FUNCTION_DECL for a function definition.
13391 DECLSPECS and DECLARATOR are the parts of the declaration;
13392 they describe the return type and the name of the function,
13393 but twisted together in a fashion that parallels the syntax of C.
13395 This function creates a binding context for the function body
13396 as well as setting up the FUNCTION_DECL in current_function_decl.
13398 Returns a FUNCTION_DECL on success.
13400 If the DECLARATOR is not suitable for a function (it defines a datum
13401 instead), we return 0, which tells yyparse to report a parse error.
13403 May return void_type_node indicating that this method is actually
13404 a friend. See grokfield for more details.
13406 Came here with a `.pushlevel' .
13408 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13409 CHANGES TO CODE IN `grokfield'. */
13412 grokmethod (cp_decl_specifier_seq *declspecs,
13413 const cp_declarator *declarator, tree attrlist)
13415 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13418 if (fndecl == error_mark_node)
13419 return error_mark_node;
13421 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13423 error ("invalid member function declaration");
13424 return error_mark_node;
13428 cplus_decl_attributes (&fndecl, attrlist, 0);
13430 /* Pass friends other than inline friend functions back. */
13431 if (fndecl == void_type_node)
13434 if (DECL_IN_AGGR_P (fndecl))
13436 if (DECL_CLASS_SCOPE_P (fndecl))
13437 error ("%qD is already defined in class %qT", fndecl,
13438 DECL_CONTEXT (fndecl));
13439 return error_mark_node;
13442 check_template_shadow (fndecl);
13444 DECL_DECLARED_INLINE_P (fndecl) = 1;
13445 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13447 /* We process method specializations in finish_struct_1. */
13448 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13450 fndecl = push_template_decl (fndecl);
13451 if (fndecl == error_mark_node)
13455 if (! DECL_FRIEND_P (fndecl))
13457 if (DECL_CHAIN (fndecl))
13459 fndecl = copy_node (fndecl);
13460 TREE_CHAIN (fndecl) = NULL_TREE;
13464 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13466 DECL_IN_AGGR_P (fndecl) = 1;
13471 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13472 we can lay it out later, when and if its type becomes complete. */
13475 maybe_register_incomplete_var (tree var)
13477 gcc_assert (TREE_CODE (var) == VAR_DECL);
13479 /* Keep track of variables with incomplete types. */
13480 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13481 && DECL_EXTERNAL (var))
13483 tree inner_type = TREE_TYPE (var);
13485 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13486 inner_type = TREE_TYPE (inner_type);
13487 inner_type = TYPE_MAIN_VARIANT (inner_type);
13489 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13490 /* RTTI TD entries are created while defining the type_info. */
13491 || (TYPE_LANG_SPECIFIC (inner_type)
13492 && TYPE_BEING_DEFINED (inner_type)))
13495 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13497 iv->incomplete_type = inner_type;
13502 /* Called when a class type (given by TYPE) is defined. If there are
13503 any existing VAR_DECLs whose type has been completed by this
13504 declaration, update them now. */
13507 complete_vars (tree type)
13510 incomplete_var *iv;
13512 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13514 if (same_type_p (type, iv->incomplete_type))
13516 tree var = iv->decl;
13517 tree type = TREE_TYPE (var);
13518 /* Complete the type of the variable. The VAR_DECL itself
13519 will be laid out in expand_expr. */
13520 complete_type (type);
13521 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13522 /* Remove this entry from the list. */
13523 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13529 /* Check for pending declarations which may have abstract type. */
13530 complete_type_check_abstract (type);
13533 /* If DECL is of a type which needs a cleanup, build and return an
13534 expression to perform that cleanup here. Return NULL_TREE if no
13535 cleanup need be done. */
13538 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13544 /* Assume no cleanup is required. */
13545 cleanup = NULL_TREE;
13547 if (error_operand_p (decl))
13550 /* Handle "__attribute__((cleanup))". We run the cleanup function
13551 before the destructor since the destructor is what actually
13552 terminates the lifetime of the object. */
13553 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13560 /* Get the name specified by the user for the cleanup function. */
13561 id = TREE_VALUE (TREE_VALUE (attr));
13562 /* Look up the name to find the cleanup function to call. It is
13563 important to use lookup_name here because that is what is
13564 used in c-common.c:handle_cleanup_attribute when performing
13565 initial checks on the attribute. Note that those checks
13566 include ensuring that the function found is not an overloaded
13567 function, or an object with an overloaded call operator,
13568 etc.; we can rely on the fact that the function found is an
13569 ordinary FUNCTION_DECL. */
13570 fn = lookup_name (id);
13571 arg = build_address (decl);
13573 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13574 if (cleanup == error_mark_node)
13575 return error_mark_node;
13577 /* Handle ordinary C++ destructors. */
13578 type = TREE_TYPE (decl);
13579 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13581 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13582 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13583 && CLASSTYPE_VBASECLASSES (type));
13587 if (TREE_CODE (type) == ARRAY_TYPE)
13590 addr = build_address (decl);
13592 /* Optimize for space over speed here. */
13593 if (!has_vbases || flag_expensive_optimizations)
13594 flags |= LOOKUP_NONVIRTUAL;
13596 call = build_delete (TREE_TYPE (addr), addr,
13597 sfk_complete_destructor, flags, 0, complain);
13598 if (call == error_mark_node)
13599 cleanup = error_mark_node;
13601 cleanup = cp_build_compound_expr (cleanup, call, complain);
13609 /* When a stmt has been parsed, this function is called. */
13616 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13617 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13618 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13621 static_fn_type (tree memfntype)
13626 if (TYPE_PTRMEMFUNC_P (memfntype))
13627 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13628 if (POINTER_TYPE_P (memfntype)
13629 || TREE_CODE (memfntype) == FUNCTION_DECL)
13630 memfntype = TREE_TYPE (memfntype);
13631 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13633 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13634 args = TYPE_ARG_TYPES (memfntype);
13635 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13636 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13637 fntype = (cp_build_type_attribute_variant
13638 (fntype, TYPE_ATTRIBUTES (memfntype)));
13639 fntype = (build_exception_variant
13640 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13644 /* DECL was originally constructed as a non-static member function,
13645 but turned out to be static. Update it accordingly. */
13648 revert_static_member_fn (tree decl)
13650 tree stype = static_fn_type (decl);
13651 cp_cv_quals quals = type_memfn_quals (stype);
13653 if (quals != TYPE_UNQUALIFIED)
13654 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13656 TREE_TYPE (decl) = stype;
13658 if (DECL_ARGUMENTS (decl))
13659 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13660 DECL_STATIC_FUNCTION_P (decl) = 1;
13663 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13664 one of the language-independent trees. */
13666 enum cp_tree_node_structure_enum
13667 cp_tree_node_structure (union lang_tree_node * t)
13669 switch (TREE_CODE (&t->generic))
13671 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13672 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13673 case OVERLOAD: return TS_CP_OVERLOAD;
13674 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13675 case PTRMEM_CST: return TS_CP_PTRMEM;
13676 case BASELINK: return TS_CP_BASELINK;
13677 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13678 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13679 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13680 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13681 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13682 default: return TS_CP_GENERIC;
13686 /* Build the void_list_node (void_type_node having been created). */
13688 build_void_list_node (void)
13690 tree t = build_tree_list (NULL_TREE, void_type_node);
13695 cp_missing_noreturn_ok_p (tree decl)
13697 /* A missing noreturn is ok for the `main' function. */
13698 return DECL_MAIN_P (decl);
13701 /* Return the COMDAT group into which DECL should be placed. */
13704 cxx_comdat_group (tree decl)
13708 /* Virtual tables, construction virtual tables, and virtual table
13709 tables all go in a single COMDAT group, named after the primary
13711 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13712 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13713 /* For all other DECLs, the COMDAT group is the mangled name of the
13714 declaration itself. */
13717 while (DECL_THUNK_P (decl))
13719 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13720 into the same section as the target function. In that case
13721 we must return target's name. */
13722 tree target = THUNK_TARGET (decl);
13723 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13724 && DECL_SECTION_NAME (target) != NULL
13725 && DECL_ONE_ONLY (target))
13730 name = DECL_ASSEMBLER_NAME (decl);
13736 #include "gt-cp-decl.h"