1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-pragma.h"
49 #include "diagnostic.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 BSP_VAR, /* variable */
60 BSP_PARM, /* parameter */
65 static tree grokparms (tree parmlist, tree *);
66 static const char *redeclaration_error_message (tree, tree);
68 static int decl_jump_unsafe (tree);
69 static void require_complete_types_for_parms (tree);
70 static int ambi_op_p (enum tree_code);
71 static int unary_op_p (enum tree_code);
72 static void push_local_name (tree);
73 static tree grok_reference_init (tree, tree, tree, tree *);
74 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
76 static void record_unknown_type (tree, const char *);
77 static tree builtin_function_1 (tree, tree, bool);
78 static tree build_library_fn_1 (tree, enum tree_code, tree);
79 static int member_function_or_else (tree, tree, enum overload_flags);
80 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
82 static void check_for_uninitialized_const_var (tree);
83 static hashval_t typename_hash (const void *);
84 static int typename_compare (const void *, const void *);
85 static tree local_variable_p_walkfn (tree *, int *, void *);
86 static tree record_builtin_java_type (const char *, int);
87 static const char *tag_name (enum tag_types);
88 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
89 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
90 static void maybe_deduce_size_from_array_init (tree, tree);
91 static void layout_var_decl (tree);
92 static tree check_initializer (tree, tree, int, tree *);
93 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
94 static void save_function_data (tree);
95 static void copy_type_enum (tree , tree);
96 static void check_function_type (tree, tree);
97 static void finish_constructor_body (void);
98 static void begin_destructor_body (void);
99 static void finish_destructor_body (void);
100 static void record_key_method_defined (tree);
101 static tree create_array_type_for_decl (tree, tree, tree);
102 static tree get_atexit_node (void);
103 static tree get_dso_handle_node (void);
104 static tree start_cleanup_fn (void);
105 static void end_cleanup_fn (void);
106 static tree cp_make_fname_decl (location_t, tree, int);
107 static void initialize_predefined_identifiers (void);
108 static tree check_special_function_return_type
109 (special_function_kind, tree, tree);
110 static tree push_cp_library_fn (enum tree_code, tree);
111 static tree build_cp_library_fn (tree, enum tree_code, tree);
112 static void store_parm_decls (tree);
113 static void initialize_local_var (tree, tree);
114 static void expand_static_init (tree, tree);
116 /* The following symbols are subsumed in the cp_global_trees array, and
117 listed here individually for documentation purposes.
120 tree wchar_decl_node;
122 tree vtable_entry_type;
123 tree delta_type_node;
124 tree __t_desc_type_node;
126 tree class_type_node;
127 tree unknown_type_node;
129 Array type `vtable_entry_type[]'
132 tree vtbl_ptr_type_node;
139 A FUNCTION_DECL which can call `abort'. Not necessarily the
140 one that the user will declare, but sufficient to be called
141 by routines that want to abort the program.
145 The FUNCTION_DECL for the default `::operator delete'.
147 tree global_delete_fndecl;
150 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
151 tree tinfo_var_id; */
153 tree cp_global_trees[CPTI_MAX];
155 /* Indicates that there is a type value in some namespace, although
156 that is not necessarily in scope at the moment. */
158 tree global_type_node;
160 /* The node that holds the "name" of the global scope. */
161 tree global_scope_name;
163 #define local_names cp_function_chain->x_local_names
165 /* A list of objects which have constructors or destructors
166 which reside in the global scope. The decl is stored in
167 the TREE_VALUE slot and the initializer is stored
168 in the TREE_PURPOSE slot. */
169 tree static_aggregates;
173 /* A node for the integer constant 2. */
175 tree integer_two_node;
177 /* Used only for jumps to as-yet undefined labels, since jumps to
178 defined labels can have their validity checked immediately. */
180 struct GTY(()) named_label_use_entry {
181 struct named_label_use_entry *next;
182 /* The binding level to which this entry is *currently* attached.
183 This is initially the binding level in which the goto appeared,
184 but is modified as scopes are closed. */
185 struct cp_binding_level *binding_level;
186 /* The head of the names list that was current when the goto appeared,
187 or the inner scope popped. These are the decls that will *not* be
188 skipped when jumping to the label. */
190 /* The location of the goto, for error reporting. */
191 location_t o_goto_locus;
192 /* True if an OpenMP structured block scope has been closed since
193 the goto appeared. This means that the branch from the label will
194 illegally exit an OpenMP scope. */
198 /* A list of all LABEL_DECLs in the function that have names. Here so
199 we can clear out their names' definitions at the end of the
200 function, and so we can check the validity of jumps to these labels. */
202 struct GTY(()) named_label_entry {
203 /* The decl itself. */
206 /* The binding level to which the label is *currently* attached.
207 This is initially set to the binding level in which the label
208 is defined, but is modified as scopes are closed. */
209 struct cp_binding_level *binding_level;
210 /* The head of the names list that was current when the label was
211 defined, or the inner scope popped. These are the decls that will
212 be skipped when jumping to the label. */
214 /* A vector of all decls from all binding levels that would be
215 crossed by a backward branch to the label. */
216 VEC(tree,gc) *bad_decls;
218 /* A list of uses of the label, before the label is defined. */
219 struct named_label_use_entry *uses;
221 /* The following bits are set after the label is defined, and are
222 updated as scopes are popped. They indicate that a backward jump
223 to the label will illegally enter a scope of the given flavor. */
229 #define named_labels cp_function_chain->x_named_labels
231 /* The number of function bodies which we are currently processing.
232 (Zero if we are at namespace scope, one inside the body of a
233 function, two inside the body of a function in a local class, etc.) */
236 /* To avoid unwanted recursion, finish_function defers all mark_used calls
237 encountered during its execution until it finishes. */
238 bool defer_mark_used_calls;
239 VEC(tree, gc) *deferred_mark_used_calls;
241 /* States indicating how grokdeclarator() should handle declspecs marked
242 with __attribute__((deprecated)). An object declared as
243 __attribute__((deprecated)) suppresses warnings of uses of other
245 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
248 /* A list of VAR_DECLs whose type was incomplete at the time the
249 variable was declared. */
251 typedef struct GTY(()) incomplete_var_d {
253 tree incomplete_type;
256 DEF_VEC_O(incomplete_var);
257 DEF_VEC_ALLOC_O(incomplete_var,gc);
259 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
261 /* Returns the kind of template specialization we are currently
262 processing, given that it's declaration contained N_CLASS_SCOPES
263 explicit scope qualifications. */
266 current_tmpl_spec_kind (int n_class_scopes)
268 int n_template_parm_scopes = 0;
269 int seen_specialization_p = 0;
270 int innermost_specialization_p = 0;
271 struct cp_binding_level *b;
273 /* Scan through the template parameter scopes. */
274 for (b = current_binding_level;
275 b->kind == sk_template_parms;
278 /* If we see a specialization scope inside a parameter scope,
279 then something is wrong. That corresponds to a declaration
282 template <class T> template <> ...
284 which is always invalid since [temp.expl.spec] forbids the
285 specialization of a class member template if the enclosing
286 class templates are not explicitly specialized as well. */
287 if (b->explicit_spec_p)
289 if (n_template_parm_scopes == 0)
290 innermost_specialization_p = 1;
292 seen_specialization_p = 1;
294 else if (seen_specialization_p == 1)
295 return tsk_invalid_member_spec;
297 ++n_template_parm_scopes;
300 /* Handle explicit instantiations. */
301 if (processing_explicit_instantiation)
303 if (n_template_parm_scopes != 0)
304 /* We've seen a template parameter list during an explicit
305 instantiation. For example:
307 template <class T> template void f(int);
309 This is erroneous. */
310 return tsk_invalid_expl_inst;
312 return tsk_expl_inst;
315 if (n_template_parm_scopes < n_class_scopes)
316 /* We've not seen enough template headers to match all the
317 specialized classes present. For example:
319 template <class T> void R<T>::S<T>::f(int);
321 This is invalid; there needs to be one set of template
322 parameters for each class. */
323 return tsk_insufficient_parms;
324 else if (n_template_parm_scopes == n_class_scopes)
325 /* We're processing a non-template declaration (even though it may
326 be a member of a template class.) For example:
328 template <class T> void S<T>::f(int);
330 The `class T' matches the `S<T>', leaving no template headers
331 corresponding to the `f'. */
333 else if (n_template_parm_scopes > n_class_scopes + 1)
334 /* We've got too many template headers. For example:
336 template <> template <class T> void f (T);
338 There need to be more enclosing classes. */
339 return tsk_excessive_parms;
341 /* This must be a template. It's of the form:
343 template <class T> template <class U> void S<T>::f(U);
345 This is a specialization if the innermost level was a
346 specialization; otherwise it's just a definition of the
348 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
351 /* Exit the current scope. */
359 /* When a label goes out of scope, check to see if that label was used
360 in a valid manner, and issue any appropriate warnings or errors. */
363 pop_label (tree label, tree old_value)
365 if (!processing_template_decl)
367 if (DECL_INITIAL (label) == NULL_TREE)
371 error ("label %q+D used but not defined", label);
372 location = input_location; /* FIXME want (input_filename, (line)0) */
373 /* Avoid crashing later. */
374 define_label (location, DECL_NAME (label));
377 warn_for_unused_label (label);
380 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
383 /* At the end of a function, all labels declared within the function
384 go out of scope. BLOCK is the top-level block for the
388 pop_labels_1 (void **slot, void *data)
390 struct named_label_entry *ent = (struct named_label_entry *) *slot;
391 tree block = (tree) data;
393 pop_label (ent->label_decl, NULL_TREE);
395 /* Put the labels into the "variables" of the top-level block,
396 so debugger can see them. */
397 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
398 BLOCK_VARS (block) = ent->label_decl;
400 htab_clear_slot (named_labels, slot);
406 pop_labels (tree block)
410 htab_traverse (named_labels, pop_labels_1, block);
415 /* At the end of a block with local labels, restore the outer definition. */
418 pop_local_label (tree label, tree old_value)
420 struct named_label_entry dummy;
423 pop_label (label, old_value);
425 dummy.label_decl = label;
426 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
427 htab_clear_slot (named_labels, slot);
430 /* The following two routines are used to interface to Objective-C++.
431 The binding level is purposely treated as an opaque type. */
434 objc_get_current_scope (void)
436 return current_binding_level;
439 /* The following routine is used by the NeXT-style SJLJ exceptions;
440 variables get marked 'volatile' so as to not be clobbered by
441 _setjmp()/_longjmp() calls. All variables in the current scope,
442 as well as parent scopes up to (but not including) ENCLOSING_BLK
443 shall be thusly marked. */
446 objc_mark_locals_volatile (void *enclosing_blk)
448 struct cp_binding_level *scope;
450 for (scope = current_binding_level;
451 scope && scope != enclosing_blk;
452 scope = scope->level_chain)
456 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
457 objc_volatilize_decl (decl);
459 /* Do not climb up past the current function. */
460 if (scope->kind == sk_function_parms)
465 /* Update data for defined and undefined labels when leaving a scope. */
468 poplevel_named_label_1 (void **slot, void *data)
470 struct named_label_entry *ent = (struct named_label_entry *) *slot;
471 struct cp_binding_level *bl = (struct cp_binding_level *) data;
472 struct cp_binding_level *obl = bl->level_chain;
474 if (ent->binding_level == bl)
478 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
479 TREE_LISTs representing OVERLOADs, so be careful. */
480 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
482 : TREE_CHAIN (decl)))
483 if (decl_jump_unsafe (decl))
484 VEC_safe_push (tree, gc, ent->bad_decls, decl);
486 ent->binding_level = obl;
487 ent->names_in_scope = obl->names;
491 ent->in_try_scope = true;
494 ent->in_catch_scope = true;
497 ent->in_omp_scope = true;
505 struct named_label_use_entry *use;
507 for (use = ent->uses; use ; use = use->next)
508 if (use->binding_level == bl)
510 use->binding_level = obl;
511 use->names_in_scope = obl->names;
512 if (bl->kind == sk_omp)
513 use->in_omp_scope = true;
520 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
521 when errors were reported, except for -Werror-unused-but-set-*. */
522 static int unused_but_set_errorcount;
524 /* Exit a binding level.
525 Pop the level off, and restore the state of the identifier-decl mappings
526 that were in effect when this level was entered.
528 If KEEP == 1, this level had explicit declarations, so
529 and create a "block" (a BLOCK node) for the level
530 to record its declarations and subblocks for symbol table output.
532 If FUNCTIONBODY is nonzero, this level is the body of a function,
533 so create a block as if KEEP were set and also clear out all
536 If REVERSE is nonzero, reverse the order of decls before putting
537 them into the BLOCK. */
540 poplevel (int keep, int reverse, int functionbody)
543 /* The chain of decls was accumulated in reverse order.
544 Put it into forward order, just for cleanliness. */
549 int leaving_for_scope;
552 cp_label_binding *label_bind;
554 timevar_push (TV_NAME_LOOKUP);
559 gcc_assert (current_binding_level->kind != sk_class);
561 if (current_binding_level->kind == sk_cleanup)
563 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
565 gcc_assert (!VEC_length(cp_class_binding,
566 current_binding_level->class_shadowed));
568 /* We used to use KEEP == 2 to indicate that the new block should go
569 at the beginning of the list of blocks at this binding level,
570 rather than the end. This hack is no longer used. */
571 gcc_assert (keep == 0 || keep == 1);
573 if (current_binding_level->keep)
576 /* Any uses of undefined labels, and any defined labels, now operate
577 under constraints of next binding contour. */
578 if (cfun && !functionbody && named_labels)
579 htab_traverse (named_labels, poplevel_named_label_1,
580 current_binding_level);
582 /* Get the decls in the order they were written.
583 Usually current_binding_level->names is in reverse order.
584 But parameter decls were previously put in forward order. */
587 current_binding_level->names
588 = decls = nreverse (current_binding_level->names);
590 decls = current_binding_level->names;
592 /* If there were any declarations or structure tags in that level,
593 or if this level is a function body,
594 create a BLOCK to record them for the life of this function. */
596 if (keep == 1 || functionbody)
597 block = make_node (BLOCK);
598 if (block != NULL_TREE)
600 BLOCK_VARS (block) = decls;
601 BLOCK_SUBBLOCKS (block) = subblocks;
604 /* In each subblock, record that this is its superior. */
606 for (link = subblocks; link; link = BLOCK_CHAIN (link))
607 BLOCK_SUPERCONTEXT (link) = block;
609 /* We still support the old for-scope rules, whereby the variables
610 in a for-init statement were in scope after the for-statement
611 ended. We only use the new rules if flag_new_for_scope is
614 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
616 /* Before we remove the declarations first check for unused variables. */
617 if ((warn_unused_variable || warn_unused_but_set_variable)
618 && !processing_template_decl)
619 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
620 if (TREE_CODE (decl) == VAR_DECL
621 && (! TREE_USED (decl) || !DECL_READ_P (decl))
622 && ! DECL_IN_SYSTEM_HEADER (decl)
623 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
625 if (! TREE_USED (decl))
626 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
627 else if (DECL_CONTEXT (decl) == current_function_decl
628 && TREE_TYPE (decl) != error_mark_node
629 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
630 && errorcount == unused_but_set_errorcount
631 && (!CLASS_TYPE_P (TREE_TYPE (decl))
632 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
634 warning (OPT_Wunused_but_set_variable,
635 "variable %q+D set but not used", decl);
636 unused_but_set_errorcount = errorcount;
640 /* Remove declarations for all the DECLs in this level. */
641 for (link = decls; link; link = TREE_CHAIN (link))
643 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 tree name = DECL_NAME (link);
650 ob = outer_binding (name,
651 IDENTIFIER_BINDING (name),
654 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
656 ns_binding = NULL_TREE;
658 if (ob && ob->scope == current_binding_level->level_chain)
659 /* We have something like:
664 and we are leaving the `for' scope. There's no reason to
665 keep the binding of the inner `i' in this case. */
666 pop_binding (name, link);
667 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
668 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
669 /* Here, we have something like:
677 We must pop the for-scope binding so we know what's a
678 type and what isn't. */
679 pop_binding (name, link);
682 /* Mark this VAR_DECL as dead so that we can tell we left it
683 there only for backward compatibility. */
684 DECL_DEAD_FOR_LOCAL (link) = 1;
686 /* Keep track of what should have happened when we
687 popped the binding. */
690 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
691 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
694 /* Add it to the list of dead variables in the next
695 outermost binding to that we can remove these when we
696 leave that binding. */
697 VEC_safe_push (tree, gc,
698 current_binding_level->level_chain->dead_vars_from_for,
701 /* Although we don't pop the cxx_binding, we do clear
702 its SCOPE since the scope is going away now. */
703 IDENTIFIER_BINDING (name)->scope
704 = current_binding_level->level_chain;
711 /* Remove the binding. */
714 if (TREE_CODE (decl) == TREE_LIST)
715 decl = TREE_VALUE (decl);
718 if (TREE_CODE (name) == OVERLOAD)
719 name = OVL_FUNCTION (name);
721 gcc_assert (DECL_P (name));
722 pop_binding (DECL_NAME (name), decl);
726 /* Remove declarations for any `for' variables from inner scopes
727 that we kept around. */
728 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
730 pop_binding (DECL_NAME (decl), decl);
732 /* Restore the IDENTIFIER_TYPE_VALUEs. */
733 for (link = current_binding_level->type_shadowed;
734 link; link = TREE_CHAIN (link))
735 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
737 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
738 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
739 current_binding_level->shadowed_labels,
741 pop_local_label (label_bind->label, label_bind->prev_value);
743 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
744 list if a `using' declaration put them there. The debugging
745 back ends won't understand OVERLOAD, so we remove them here.
746 Because the BLOCK_VARS are (temporarily) shared with
747 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
748 popped all the bindings. */
753 for (d = &BLOCK_VARS (block); *d; )
755 if (TREE_CODE (*d) == TREE_LIST)
756 *d = TREE_CHAIN (*d);
758 d = &DECL_CHAIN (*d);
762 /* If the level being exited is the top level of a function,
763 check over all the labels. */
766 /* Since this is the top level block of a function, the vars are
767 the function's parameters. Don't leave them in the BLOCK
768 because they are found in the FUNCTION_DECL instead. */
769 BLOCK_VARS (block) = 0;
773 kind = current_binding_level->kind;
774 if (kind == sk_cleanup)
778 /* If this is a temporary binding created for a cleanup, then we'll
779 have pushed a statement list level. Pop that, create a new
780 BIND_EXPR for the block, and insert it into the stream. */
781 stmt = pop_stmt_list (current_binding_level->statement_list);
782 stmt = c_build_bind_expr (input_location, block, stmt);
789 /* The current function is being defined, so its DECL_INITIAL
790 should be error_mark_node. */
791 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
792 DECL_INITIAL (current_function_decl) = block;
795 current_binding_level->blocks
796 = chainon (current_binding_level->blocks, block);
798 /* If we did not make a block for the level just exited,
799 any blocks made for inner levels
800 (since they cannot be recorded as subblocks in that level)
801 must be carried forward so they will later become subblocks
802 of something else. */
804 current_binding_level->blocks
805 = chainon (current_binding_level->blocks, subblocks);
807 /* Each and every BLOCK node created here in `poplevel' is important
808 (e.g. for proper debugging information) so if we created one
809 earlier, mark it as "used". */
811 TREE_USED (block) = 1;
813 /* All temporary bindings created for cleanups are popped silently. */
814 if (kind == sk_cleanup)
817 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
820 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
821 itself, calling F for each. The DATA is passed to F as well. */
824 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
827 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
829 result |= (*f) (name_space, data);
831 for (; current; current = DECL_CHAIN (current))
832 result |= walk_namespaces_r (current, f, data);
837 /* Walk all the namespaces, calling F for each. The DATA is passed to
841 walk_namespaces (walk_namespaces_fn f, void* data)
843 return walk_namespaces_r (global_namespace, f, data);
846 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
847 DATA is non-NULL, this is the last time we will call
848 wrapup_global_declarations for this NAMESPACE. */
851 wrapup_globals_for_namespace (tree name_space, void* data)
853 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
854 VEC(tree,gc) *statics = level->static_decls;
855 tree *vec = VEC_address (tree, statics);
856 int len = VEC_length (tree, statics);
857 int last_time = (data != 0);
861 check_global_declarations (vec, len);
862 emit_debug_global_declarations (vec, len);
866 /* Write out any globals that need to be output. */
867 return wrapup_global_declarations (vec, len);
871 /* In C++, you don't have to write `struct S' to refer to `S'; you
872 can just use `S'. We accomplish this by creating a TYPE_DECL as
873 if the user had written `typedef struct S S'. Create and return
874 the TYPE_DECL for TYPE. */
877 create_implicit_typedef (tree name, tree type)
881 decl = build_decl (input_location, TYPE_DECL, name, type);
882 DECL_ARTIFICIAL (decl) = 1;
883 /* There are other implicit type declarations, like the one *within*
884 a class that allows you to write `S::S'. We must distinguish
886 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
887 TYPE_NAME (type) = decl;
888 TYPE_STUB_DECL (type) = decl;
893 /* Remember a local name for name-mangling purposes. */
896 push_local_name (tree decl)
901 timevar_push (TV_NAME_LOOKUP);
903 name = DECL_NAME (decl);
905 nelts = VEC_length (tree, local_names);
906 for (i = 0; i < nelts; i++)
908 t = VEC_index (tree, local_names, i);
909 if (DECL_NAME (t) == name)
911 if (!DECL_LANG_SPECIFIC (decl))
912 retrofit_lang_decl (decl);
913 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
914 if (DECL_LANG_SPECIFIC (t))
915 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
917 DECL_DISCRIMINATOR (decl) = 1;
919 VEC_replace (tree, local_names, i, decl);
920 timevar_pop (TV_NAME_LOOKUP);
925 VEC_safe_push (tree, gc, local_names, decl);
926 timevar_pop (TV_NAME_LOOKUP);
929 /* Subroutine of duplicate_decls: return truthvalue of whether
930 or not types of these decls match.
932 For C++, we must compare the parameter list so that `int' can match
933 `int&' in a parameter position, but `int&' is not confused with
937 decls_match (tree newdecl, tree olddecl)
941 if (newdecl == olddecl)
944 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
945 /* If the two DECLs are not even the same kind of thing, we're not
946 interested in their types. */
949 if (TREE_CODE (newdecl) == FUNCTION_DECL)
951 tree f1 = TREE_TYPE (newdecl);
952 tree f2 = TREE_TYPE (olddecl);
953 tree p1 = TYPE_ARG_TYPES (f1);
954 tree p2 = TYPE_ARG_TYPES (f2);
956 /* Specializations of different templates are different functions
957 even if they have the same type. */
958 tree t1 = (DECL_USE_TEMPLATE (newdecl)
959 ? DECL_TI_TEMPLATE (newdecl)
961 tree t2 = (DECL_USE_TEMPLATE (olddecl)
962 ? DECL_TI_TEMPLATE (olddecl)
967 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
968 && ! (DECL_EXTERN_C_P (newdecl)
969 && DECL_EXTERN_C_P (olddecl)))
972 #ifdef NO_IMPLICIT_EXTERN_C
973 /* A new declaration doesn't match a built-in one unless it
974 is also extern "C". */
975 if (DECL_IS_BUILTIN (olddecl)
976 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
980 if (TREE_CODE (f1) != TREE_CODE (f2))
983 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
985 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
986 && (DECL_BUILT_IN (olddecl)
987 #ifndef NO_IMPLICIT_EXTERN_C
988 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
989 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
993 types_match = self_promoting_args_p (p1);
994 if (p1 == void_list_node)
995 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
997 #ifndef NO_IMPLICIT_EXTERN_C
998 else if (p1 == NULL_TREE
999 && (DECL_EXTERN_C_P (olddecl)
1000 && DECL_IN_SYSTEM_HEADER (olddecl)
1001 && !DECL_CLASS_SCOPE_P (olddecl))
1002 && (DECL_EXTERN_C_P (newdecl)
1003 && DECL_IN_SYSTEM_HEADER (newdecl)
1004 && !DECL_CLASS_SCOPE_P (newdecl)))
1006 types_match = self_promoting_args_p (p2);
1007 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1011 types_match = compparms (p1, p2);
1016 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1018 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1019 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1022 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1023 DECL_TEMPLATE_PARMS (olddecl)))
1026 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1027 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1028 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1030 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1031 DECL_TEMPLATE_RESULT (newdecl));
1035 /* Need to check scope for variable declaration (VAR_DECL).
1036 For typedef (TYPE_DECL), scope is ignored. */
1037 if (TREE_CODE (newdecl) == VAR_DECL
1038 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1040 Two declarations for an object with C language linkage
1041 with the same name (ignoring the namespace that qualify
1042 it) that appear in different namespace scopes refer to
1044 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1047 if (TREE_TYPE (newdecl) == error_mark_node)
1048 types_match = TREE_TYPE (olddecl) == error_mark_node;
1049 else if (TREE_TYPE (olddecl) == NULL_TREE)
1050 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1051 else if (TREE_TYPE (newdecl) == NULL_TREE)
1054 types_match = comptypes (TREE_TYPE (newdecl),
1055 TREE_TYPE (olddecl),
1056 COMPARE_REDECLARATION);
1062 /* If NEWDECL is `static' and an `extern' was seen previously,
1063 warn about it. OLDDECL is the previous declaration.
1065 Note that this does not apply to the C++ case of declaring
1066 a variable `extern const' and then later `const'.
1068 Don't complain about built-in functions, since they are beyond
1069 the user's control. */
1072 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1074 if (TREE_CODE (newdecl) == TYPE_DECL
1075 || TREE_CODE (newdecl) == TEMPLATE_DECL
1076 || TREE_CODE (newdecl) == CONST_DECL
1077 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1080 /* Don't get confused by static member functions; that's a different
1082 if (TREE_CODE (newdecl) == FUNCTION_DECL
1083 && DECL_STATIC_FUNCTION_P (newdecl))
1086 /* If the old declaration was `static', or the new one isn't, then
1087 then everything is OK. */
1088 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1091 /* It's OK to declare a builtin function as `static'. */
1092 if (TREE_CODE (olddecl) == FUNCTION_DECL
1093 && DECL_ARTIFICIAL (olddecl))
1096 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1097 permerror (input_location, "previous declaration of %q+D", olddecl);
1100 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1101 function templates. If their exception specifications do not
1102 match, issue a diagnostic. */
1105 check_redeclaration_exception_specification (tree new_decl,
1110 tree new_exceptions;
1111 tree old_exceptions;
1113 new_type = TREE_TYPE (new_decl);
1114 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1115 old_type = TREE_TYPE (old_decl);
1116 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1120 If any declaration of a function has an exception-specification,
1121 all declarations, including the definition and an explicit
1122 specialization, of that function shall have an
1123 exception-specification with the same set of type-ids. */
1124 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1125 && ! DECL_IS_BUILTIN (old_decl)
1127 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1129 error ("declaration of %qF has a different exception specifier",
1131 error ("from previous declaration %q+F", old_decl);
1135 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1136 Otherwise issue diagnostics. */
1139 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1141 old_decl = STRIP_TEMPLATE (old_decl);
1142 new_decl = STRIP_TEMPLATE (new_decl);
1143 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1144 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1146 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1147 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1149 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1151 /* Hide a built-in declaration. */
1152 DECL_DECLARED_CONSTEXPR_P (old_decl)
1153 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1156 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1157 error ("from previous declaration %q+D", old_decl);
1161 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1162 && lookup_attribute ("gnu_inline", \
1163 DECL_ATTRIBUTES (fn)))
1165 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1166 If the redeclaration is invalid, a diagnostic is issued, and the
1167 error_mark_node is returned. Otherwise, OLDDECL is returned.
1169 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1172 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1175 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1177 unsigned olddecl_uid = DECL_UID (olddecl);
1178 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1179 int new_defines_function = 0;
1180 tree new_template_info;
1182 if (newdecl == olddecl)
1185 types_match = decls_match (newdecl, olddecl);
1187 /* If either the type of the new decl or the type of the old decl is an
1188 error_mark_node, then that implies that we have already issued an
1189 error (earlier) for some bogus type specification, and in that case,
1190 it is rather pointless to harass the user with yet more error message
1191 about the same declaration, so just pretend the types match here. */
1192 if (TREE_TYPE (newdecl) == error_mark_node
1193 || TREE_TYPE (olddecl) == error_mark_node)
1194 return error_mark_node;
1196 if (DECL_P (olddecl)
1197 && TREE_CODE (newdecl) == FUNCTION_DECL
1198 && TREE_CODE (olddecl) == FUNCTION_DECL
1199 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1201 if (DECL_DECLARED_INLINE_P (newdecl)
1202 && DECL_UNINLINABLE (newdecl)
1203 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1204 /* Already warned elsewhere. */;
1205 else if (DECL_DECLARED_INLINE_P (olddecl)
1206 && DECL_UNINLINABLE (olddecl)
1207 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1208 /* Already warned. */;
1209 else if (DECL_DECLARED_INLINE_P (newdecl)
1210 && DECL_UNINLINABLE (olddecl)
1211 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1213 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1215 warning (OPT_Wattributes, "previous declaration of %q+D "
1216 "with attribute noinline", olddecl);
1218 else if (DECL_DECLARED_INLINE_P (olddecl)
1219 && DECL_UNINLINABLE (newdecl)
1220 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1222 warning (OPT_Wattributes, "function %q+D redeclared with "
1223 "attribute noinline", newdecl);
1224 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1229 /* Check for redeclaration and other discrepancies. */
1230 if (TREE_CODE (olddecl) == FUNCTION_DECL
1231 && DECL_ARTIFICIAL (olddecl))
1233 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1234 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1236 /* Avoid warnings redeclaring built-ins which have not been
1237 explicitly declared. */
1238 if (DECL_ANTICIPATED (olddecl))
1241 /* If you declare a built-in or predefined function name as static,
1242 the old definition is overridden, but optionally warn this was a
1243 bad choice of name. */
1244 if (! TREE_PUBLIC (newdecl))
1246 warning (OPT_Wshadow,
1247 DECL_BUILT_IN (olddecl)
1248 ? G_("shadowing built-in function %q#D")
1249 : G_("shadowing library function %q#D"), olddecl);
1250 /* Discard the old built-in function. */
1253 /* If the built-in is not ansi, then programs can override
1254 it even globally without an error. */
1255 else if (! DECL_BUILT_IN (olddecl))
1256 warning (0, "library function %q#D redeclared as non-function %q#D",
1260 error ("declaration of %q#D", newdecl);
1261 error ("conflicts with built-in declaration %q#D",
1266 else if (!types_match)
1268 /* Avoid warnings redeclaring built-ins which have not been
1269 explicitly declared. */
1270 if (DECL_ANTICIPATED (olddecl))
1272 /* Deal with fileptr_type_node. FILE type is not known
1273 at the time we create the builtins. */
1276 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1277 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1279 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1282 else if (TREE_VALUE (t2) == fileptr_type_node)
1284 tree t = TREE_VALUE (t1);
1286 if (TREE_CODE (t) == POINTER_TYPE
1287 && TYPE_NAME (TREE_TYPE (t))
1288 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1289 == get_identifier ("FILE")
1290 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1292 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1294 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1295 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1296 types_match = decls_match (newdecl, olddecl);
1298 return duplicate_decls (newdecl, olddecl,
1300 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1303 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1306 else if ((DECL_EXTERN_C_P (newdecl)
1307 && DECL_EXTERN_C_P (olddecl))
1308 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1309 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1311 /* A near match; override the builtin. */
1313 if (TREE_PUBLIC (newdecl))
1315 warning (0, "new declaration %q#D", newdecl);
1316 warning (0, "ambiguates built-in declaration %q#D",
1320 warning (OPT_Wshadow,
1321 DECL_BUILT_IN (olddecl)
1322 ? G_("shadowing built-in function %q#D")
1323 : G_("shadowing library function %q#D"), olddecl);
1326 /* Discard the old built-in function. */
1329 /* Replace the old RTL to avoid problems with inlining. */
1330 COPY_DECL_RTL (newdecl, olddecl);
1332 /* Even if the types match, prefer the new declarations type for
1333 built-ins which have not been explicitly declared, for
1334 exception lists, etc... */
1335 else if (DECL_IS_BUILTIN (olddecl))
1337 tree type = TREE_TYPE (newdecl);
1338 tree attribs = (*targetm.merge_type_attributes)
1339 (TREE_TYPE (olddecl), type);
1341 type = cp_build_type_attribute_variant (type, attribs);
1342 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1345 /* If a function is explicitly declared "throw ()", propagate that to
1346 the corresponding builtin. */
1347 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1348 && DECL_ANTICIPATED (olddecl)
1349 && TREE_NOTHROW (newdecl)
1350 && !TREE_NOTHROW (olddecl)
1351 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1352 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1354 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1356 /* Whether or not the builtin can throw exceptions has no
1357 bearing on this declarator. */
1358 TREE_NOTHROW (olddecl) = 0;
1360 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1362 /* If a builtin function is redeclared as `static', merge
1363 the declarations, but make the original one static. */
1364 DECL_THIS_STATIC (olddecl) = 1;
1365 TREE_PUBLIC (olddecl) = 0;
1367 /* Make the old declaration consistent with the new one so
1368 that all remnants of the builtin-ness of this function
1369 will be banished. */
1370 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1371 COPY_DECL_RTL (newdecl, olddecl);
1374 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1376 /* C++ Standard, 3.3, clause 4:
1377 "[Note: a namespace name or a class template name must be unique
1378 in its declarative region (7.3.2, clause 14). ]" */
1379 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1380 && TREE_CODE (newdecl) != NAMESPACE_DECL
1381 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1382 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1383 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1384 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1386 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1387 && TREE_CODE (newdecl) != TYPE_DECL)
1388 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1389 && TREE_CODE (olddecl) != TYPE_DECL))
1391 /* We do nothing special here, because C++ does such nasty
1392 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1393 get shadowed, and know that if we need to find a TYPE_DECL
1394 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1395 slot of the identifier. */
1399 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1400 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1401 || (TREE_CODE (olddecl) == FUNCTION_DECL
1402 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1406 error ("%q#D redeclared as different kind of symbol", newdecl);
1407 if (TREE_CODE (olddecl) == TREE_LIST)
1408 olddecl = TREE_VALUE (olddecl);
1409 error ("previous declaration of %q+#D", olddecl);
1411 return error_mark_node;
1413 else if (!types_match)
1415 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1416 /* These are certainly not duplicate declarations; they're
1417 from different scopes. */
1420 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1422 /* The name of a class template may not be declared to refer to
1423 any other template, class, function, object, namespace, value,
1424 or type in the same scope. */
1425 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1426 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1428 error ("declaration of template %q#D", newdecl);
1429 error ("conflicts with previous declaration %q+#D", olddecl);
1431 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1432 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1433 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1434 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1435 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1436 DECL_TEMPLATE_PARMS (olddecl))
1437 /* Template functions can be disambiguated by
1439 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1440 TREE_TYPE (TREE_TYPE (olddecl))))
1442 error ("new declaration %q#D", newdecl);
1443 error ("ambiguates old declaration %q+#D", olddecl);
1447 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1449 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1451 error ("declaration of C function %q#D conflicts with",
1453 error ("previous declaration %q+#D here", olddecl);
1455 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1456 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1458 error ("new declaration %q#D", newdecl);
1459 error ("ambiguates old declaration %q+#D", olddecl);
1460 return error_mark_node;
1467 error ("conflicting declaration %q#D", newdecl);
1468 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1469 return error_mark_node;
1472 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1473 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1474 && (!DECL_TEMPLATE_INFO (newdecl)
1475 || (DECL_TI_TEMPLATE (newdecl)
1476 != DECL_TI_TEMPLATE (olddecl))))
1477 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1478 && (!DECL_TEMPLATE_INFO (olddecl)
1479 || (DECL_TI_TEMPLATE (olddecl)
1480 != DECL_TI_TEMPLATE (newdecl))))))
1481 /* It's OK to have a template specialization and a non-template
1482 with the same type, or to have specializations of two
1483 different templates with the same type. Note that if one is a
1484 specialization, and the other is an instantiation of the same
1485 template, that we do not exit at this point. That situation
1486 can occur if we instantiate a template class, and then
1487 specialize one of its methods. This situation is valid, but
1488 the declarations must be merged in the usual way. */
1490 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1491 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1492 && !DECL_USE_TEMPLATE (newdecl))
1493 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1494 && !DECL_USE_TEMPLATE (olddecl))))
1495 /* One of the declarations is a template instantiation, and the
1496 other is not a template at all. That's OK. */
1498 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1500 /* In [namespace.alias] we have:
1502 In a declarative region, a namespace-alias-definition can be
1503 used to redefine a namespace-alias declared in that declarative
1504 region to refer only to the namespace to which it already
1507 Therefore, if we encounter a second alias directive for the same
1508 alias, we can just ignore the second directive. */
1509 if (DECL_NAMESPACE_ALIAS (newdecl)
1510 && (DECL_NAMESPACE_ALIAS (newdecl)
1511 == DECL_NAMESPACE_ALIAS (olddecl)))
1513 /* [namespace.alias]
1515 A namespace-name or namespace-alias shall not be declared as
1516 the name of any other entity in the same declarative region.
1517 A namespace-name defined at global scope shall not be
1518 declared as the name of any other entity in any global scope
1520 error ("declaration of namespace %qD conflicts with", newdecl);
1521 error ("previous declaration of namespace %q+D here", olddecl);
1522 return error_mark_node;
1526 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1529 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1530 if (DECL_NAME (olddecl) != NULL_TREE)
1531 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1532 ? "%q+#D previously defined here"
1533 : "%q+#D previously declared here", olddecl);
1534 return error_mark_node;
1536 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1537 && DECL_INITIAL (olddecl) != NULL_TREE
1538 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1539 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1541 /* Prototype decl follows defn w/o prototype. */
1542 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1543 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1544 "follows non-prototype definition here");
1546 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1547 || TREE_CODE (olddecl) == VAR_DECL)
1548 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1551 If two declarations of the same function or object
1552 specify different linkage-specifications ..., the program
1553 is ill-formed.... Except for functions with C++ linkage,
1554 a function declaration without a linkage specification
1555 shall not precede the first linkage specification for
1556 that function. A function can be declared without a
1557 linkage specification after an explicit linkage
1558 specification has been seen; the linkage explicitly
1559 specified in the earlier declaration is not affected by
1560 such a function declaration.
1562 DR 563 raises the question why the restrictions on
1563 functions should not also apply to objects. Older
1564 versions of G++ silently ignore the linkage-specification
1572 which is clearly wrong. Therefore, we now treat objects
1574 if (current_lang_depth () == 0)
1576 /* There is no explicit linkage-specification, so we use
1577 the linkage from the previous declaration. */
1578 if (!DECL_LANG_SPECIFIC (newdecl))
1579 retrofit_lang_decl (newdecl);
1580 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1584 error ("previous declaration of %q+#D with %qL linkage",
1585 olddecl, DECL_LANGUAGE (olddecl));
1586 error ("conflicts with new declaration with %qL linkage",
1587 DECL_LANGUAGE (newdecl));
1591 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1593 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1595 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1596 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1599 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1600 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1602 for (; t1 && t1 != void_list_node;
1603 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1604 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1606 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1609 permerror (input_location, "default argument given for parameter %d of %q#D",
1611 permerror (input_location, "after previous specification in %q+#D", olddecl);
1615 error ("default argument given for parameter %d of %q#D",
1617 error ("after previous specification in %q+#D",
1624 /* Do not merge an implicit typedef with an explicit one. In:
1628 typedef class A A __attribute__ ((foo));
1630 the attribute should apply only to the typedef. */
1631 if (TREE_CODE (olddecl) == TYPE_DECL
1632 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1633 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1636 /* If new decl is `static' and an `extern' was seen previously,
1638 warn_extern_redeclared_static (newdecl, olddecl);
1640 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1641 return error_mark_node;
1643 /* We have committed to returning 1 at this point. */
1644 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1646 /* Now that functions must hold information normally held
1647 by field decls, there is extra work to do so that
1648 declaration information does not get destroyed during
1650 if (DECL_VINDEX (olddecl))
1651 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1652 if (DECL_CONTEXT (olddecl))
1653 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1654 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1655 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1656 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1657 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1658 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1659 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1660 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1661 SET_OVERLOADED_OPERATOR_CODE
1662 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1663 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1665 /* Optionally warn about more than one declaration for the same
1666 name, but don't warn about a function declaration followed by a
1668 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1669 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1670 /* Don't warn about extern decl followed by definition. */
1671 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1672 /* Don't warn about friends, let add_friend take care of it. */
1673 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1675 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1676 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1679 if (DECL_DELETED_FN (newdecl))
1681 error ("deleted definition of %qD", newdecl);
1682 error ("after previous declaration %q+D", olddecl);
1686 /* Deal with C++: must preserve virtual function table size. */
1687 if (TREE_CODE (olddecl) == TYPE_DECL)
1689 tree newtype = TREE_TYPE (newdecl);
1690 tree oldtype = TREE_TYPE (olddecl);
1692 if (newtype != error_mark_node && oldtype != error_mark_node
1693 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1694 CLASSTYPE_FRIEND_CLASSES (newtype)
1695 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1697 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1700 /* Copy all the DECL_... slots specified in the new decl
1701 except for any that we copy here from the old type. */
1702 DECL_ATTRIBUTES (newdecl)
1703 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1705 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1709 old_result = DECL_TEMPLATE_RESULT (olddecl);
1710 new_result = DECL_TEMPLATE_RESULT (newdecl);
1711 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1712 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1713 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1714 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1716 DECL_ATTRIBUTES (old_result)
1717 = (*targetm.merge_decl_attributes) (old_result, new_result);
1719 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1721 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1722 && DECL_INITIAL (new_result))
1724 if (DECL_INITIAL (old_result))
1725 DECL_UNINLINABLE (old_result) = 1;
1727 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1728 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1729 DECL_NOT_REALLY_EXTERN (old_result)
1730 = DECL_NOT_REALLY_EXTERN (new_result);
1731 DECL_INTERFACE_KNOWN (old_result)
1732 = DECL_INTERFACE_KNOWN (new_result);
1733 DECL_DECLARED_INLINE_P (old_result)
1734 = DECL_DECLARED_INLINE_P (new_result);
1735 DECL_DISREGARD_INLINE_LIMITS (old_result)
1736 |= DECL_DISREGARD_INLINE_LIMITS (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);
1745 check_redeclaration_exception_specification (newdecl, olddecl);
1749 /* If the new declaration is a definition, update the file and
1750 line information on the declaration, and also make
1751 the old declaration the same definition. */
1752 if (DECL_INITIAL (new_result) != NULL_TREE)
1754 DECL_SOURCE_LOCATION (olddecl)
1755 = DECL_SOURCE_LOCATION (old_result)
1756 = DECL_SOURCE_LOCATION (newdecl);
1757 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1758 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1761 DECL_ARGUMENTS (old_result)
1762 = DECL_ARGUMENTS (new_result);
1763 for (parm = DECL_ARGUMENTS (old_result); parm;
1764 parm = DECL_CHAIN (parm))
1765 DECL_CONTEXT (parm) = old_result;
1774 /* Automatically handles default parameters. */
1775 tree oldtype = TREE_TYPE (olddecl);
1778 /* Merge the data types specified in the two decls. */
1779 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1781 /* If merge_types produces a non-typedef type, just use the old type. */
1782 if (TREE_CODE (newdecl) == TYPE_DECL
1783 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1786 if (TREE_CODE (newdecl) == VAR_DECL)
1788 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1789 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1790 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1791 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1792 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1793 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1795 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1796 if (DECL_LANG_SPECIFIC (olddecl)
1797 && CP_DECL_THREADPRIVATE_P (olddecl))
1799 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1800 if (!DECL_LANG_SPECIFIC (newdecl))
1801 retrofit_lang_decl (newdecl);
1803 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1804 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1808 /* Do this after calling `merge_types' so that default
1809 parameters don't confuse us. */
1810 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1811 check_redeclaration_exception_specification (newdecl, olddecl);
1812 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1814 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1815 check_default_args (newdecl);
1817 /* Lay the type out, unless already done. */
1818 if (! same_type_p (newtype, oldtype)
1819 && TREE_TYPE (newdecl) != error_mark_node
1820 && !(processing_template_decl && uses_template_parms (newdecl)))
1821 layout_type (TREE_TYPE (newdecl));
1823 if ((TREE_CODE (newdecl) == VAR_DECL
1824 || TREE_CODE (newdecl) == PARM_DECL
1825 || TREE_CODE (newdecl) == RESULT_DECL
1826 || TREE_CODE (newdecl) == FIELD_DECL
1827 || TREE_CODE (newdecl) == TYPE_DECL)
1828 && !(processing_template_decl && uses_template_parms (newdecl)))
1829 layout_decl (newdecl, 0);
1831 /* Merge the type qualifiers. */
1832 if (TREE_READONLY (newdecl))
1833 TREE_READONLY (olddecl) = 1;
1834 if (TREE_THIS_VOLATILE (newdecl))
1835 TREE_THIS_VOLATILE (olddecl) = 1;
1836 if (TREE_NOTHROW (newdecl))
1837 TREE_NOTHROW (olddecl) = 1;
1839 /* Merge deprecatedness. */
1840 if (TREE_DEPRECATED (newdecl))
1841 TREE_DEPRECATED (olddecl) = 1;
1843 /* Preserve function specific target and optimization options */
1844 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1846 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1847 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1848 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1849 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1851 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1852 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1853 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1854 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1857 /* Merge the initialization information. */
1858 if (DECL_INITIAL (newdecl) == NULL_TREE
1859 && DECL_INITIAL (olddecl) != NULL_TREE)
1861 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1862 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1863 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1865 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1866 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1870 /* Merge the section attribute.
1871 We want to issue an error if the sections conflict but that must be
1872 done later in decl_attributes since we are called before attributes
1874 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1875 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1877 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1879 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1880 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1881 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1882 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1883 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1884 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1885 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1886 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1887 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1888 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1889 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1890 /* Keep the old RTL. */
1891 COPY_DECL_RTL (olddecl, newdecl);
1893 else if (TREE_CODE (newdecl) == VAR_DECL
1894 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1896 /* Keep the old RTL. We cannot keep the old RTL if the old
1897 declaration was for an incomplete object and the new
1898 declaration is not since many attributes of the RTL will
1900 COPY_DECL_RTL (olddecl, newdecl);
1903 /* If cannot merge, then use the new type and qualifiers,
1904 and don't preserve the old rtl. */
1907 /* Clean out any memory we had of the old declaration. */
1908 tree oldstatic = value_member (olddecl, static_aggregates);
1910 TREE_VALUE (oldstatic) = error_mark_node;
1912 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1913 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1914 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1915 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1918 /* Merge the storage class information. */
1919 merge_weak (newdecl, olddecl);
1921 if (DECL_ONE_ONLY (olddecl))
1922 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1924 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1925 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1926 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1927 if (! DECL_EXTERNAL (olddecl))
1928 DECL_EXTERNAL (newdecl) = 0;
1930 new_template_info = NULL_TREE;
1931 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1933 bool new_redefines_gnu_inline = false;
1935 if (new_defines_function
1936 && ((DECL_INTERFACE_KNOWN (olddecl)
1937 && TREE_CODE (olddecl) == FUNCTION_DECL)
1938 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1939 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1940 == FUNCTION_DECL))))
1944 if (TREE_CODE (fn) == TEMPLATE_DECL)
1945 fn = DECL_TEMPLATE_RESULT (olddecl);
1947 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1950 if (!new_redefines_gnu_inline)
1952 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1953 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1954 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1956 DECL_TEMPLATE_INSTANTIATED (newdecl)
1957 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1958 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1960 /* If the OLDDECL is an instantiation and/or specialization,
1961 then the NEWDECL must be too. But, it may not yet be marked
1962 as such if the caller has created NEWDECL, but has not yet
1963 figured out that it is a redeclaration. */
1964 if (!DECL_USE_TEMPLATE (newdecl))
1965 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1967 /* Don't really know how much of the language-specific
1968 values we should copy from old to new. */
1969 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1970 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1971 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1972 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1974 if (LANG_DECL_HAS_MIN (newdecl))
1976 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1977 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1978 if (DECL_TEMPLATE_INFO (newdecl))
1979 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1980 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1982 /* Only functions have these fields. */
1983 if (TREE_CODE (newdecl) == FUNCTION_DECL
1984 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1986 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1987 olddecl_friend = DECL_FRIEND_P (olddecl);
1988 hidden_friend = (DECL_ANTICIPATED (olddecl)
1989 && DECL_HIDDEN_FRIEND_P (olddecl)
1990 && newdecl_is_friend);
1991 DECL_BEFRIENDING_CLASSES (newdecl)
1992 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1993 DECL_BEFRIENDING_CLASSES (olddecl));
1994 /* DECL_THUNKS is only valid for virtual functions,
1995 otherwise it is a DECL_FRIEND_CONTEXT. */
1996 if (DECL_VIRTUAL_P (newdecl))
1997 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1999 /* Only variables have this field. */
2000 else if (TREE_CODE (newdecl) == VAR_DECL
2001 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2002 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2005 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2009 /* Merge parameter attributes. */
2010 tree oldarg, newarg;
2011 for (oldarg = DECL_ARGUMENTS(olddecl),
2012 newarg = DECL_ARGUMENTS(newdecl);
2014 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2015 DECL_ATTRIBUTES (newarg)
2016 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2017 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2020 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2021 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2023 /* If newdecl is not a specialization, then it is not a
2024 template-related function at all. And that means that we
2025 should have exited above, returning 0. */
2026 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2028 if (DECL_ODR_USED (olddecl))
2029 /* From [temp.expl.spec]:
2031 If a template, a member template or the member of a class
2032 template is explicitly specialized then that
2033 specialization shall be declared before the first use of
2034 that specialization that would cause an implicit
2035 instantiation to take place, in every translation unit in
2036 which such a use occurs. */
2037 error ("explicit specialization of %qD after first use",
2040 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2042 /* Don't propagate visibility from the template to the
2043 specialization here. We'll do that in determine_visibility if
2045 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2047 /* [temp.expl.spec/14] We don't inline explicit specialization
2048 just because the primary template says so. */
2050 else if (new_defines_function && DECL_INITIAL (olddecl))
2052 /* Never inline re-defined extern inline functions.
2053 FIXME: this could be better handled by keeping both
2054 function as separate declarations. */
2055 DECL_UNINLINABLE (newdecl) = 1;
2059 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2060 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2062 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2064 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2065 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2067 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2068 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2069 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2070 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2073 /* Preserve abstractness on cloned [cd]tors. */
2074 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2076 /* Update newdecl's parms to point at olddecl. */
2077 for (parm = DECL_ARGUMENTS (newdecl); parm;
2078 parm = DECL_CHAIN (parm))
2079 DECL_CONTEXT (parm) = olddecl;
2083 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2084 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2085 COPY_DECL_RTL (newdecl, olddecl);
2087 if (! types_match || new_defines_function)
2089 /* These need to be copied so that the names are available.
2090 Note that if the types do match, we'll preserve inline
2091 info and other bits, but if not, we won't. */
2092 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2093 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2095 if (new_defines_function)
2096 /* If defining a function declared with other language
2097 linkage, use the previously declared language linkage. */
2098 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2099 else if (types_match)
2101 /* If redeclaring a builtin function, and not a definition,
2102 it stays built in. */
2103 if (DECL_BUILT_IN (olddecl))
2105 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2106 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2107 /* If we're keeping the built-in definition, keep the rtl,
2108 regardless of declaration matches. */
2109 COPY_DECL_RTL (olddecl, newdecl);
2112 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2113 /* Don't clear out the arguments if we're just redeclaring a
2115 if (DECL_ARGUMENTS (olddecl))
2116 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2119 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2120 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2122 /* Now preserve various other info from the definition. */
2123 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2124 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2125 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2126 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2128 /* Warn about conflicting visibility specifications. */
2129 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2130 && DECL_VISIBILITY_SPECIFIED (newdecl)
2131 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2133 warning_at (input_location, OPT_Wattributes,
2134 "%q+D: visibility attribute ignored because it", newdecl);
2135 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2136 "conflicts with previous declaration here");
2138 /* Choose the declaration which specified visibility. */
2139 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2141 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2142 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2144 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2145 so keep this behavior. */
2146 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2148 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2149 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2151 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2152 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2153 if (TREE_CODE (newdecl) == FIELD_DECL)
2154 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2156 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2157 with that from NEWDECL below. */
2158 if (DECL_LANG_SPECIFIC (olddecl))
2160 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2161 != DECL_LANG_SPECIFIC (newdecl));
2162 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2165 /* Merge the USED information. */
2166 if (TREE_USED (olddecl))
2167 TREE_USED (newdecl) = 1;
2168 else if (TREE_USED (newdecl))
2169 TREE_USED (olddecl) = 1;
2170 if (TREE_CODE (newdecl) == VAR_DECL)
2172 if (DECL_READ_P (olddecl))
2173 DECL_READ_P (newdecl) = 1;
2174 else if (DECL_READ_P (newdecl))
2175 DECL_READ_P (olddecl) = 1;
2177 if (DECL_PRESERVE_P (olddecl))
2178 DECL_PRESERVE_P (newdecl) = 1;
2179 else if (DECL_PRESERVE_P (newdecl))
2180 DECL_PRESERVE_P (olddecl) = 1;
2182 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2186 function_size = sizeof (struct tree_decl_common);
2188 memcpy ((char *) olddecl + sizeof (struct tree_common),
2189 (char *) newdecl + sizeof (struct tree_common),
2190 function_size - sizeof (struct tree_common));
2192 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2193 (char *) newdecl + sizeof (struct tree_decl_common),
2194 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2195 if (new_template_info)
2196 /* If newdecl is a template instantiation, it is possible that
2197 the following sequence of events has occurred:
2199 o A friend function was declared in a class template. The
2200 class template was instantiated.
2202 o The instantiation of the friend declaration was
2203 recorded on the instantiation list, and is newdecl.
2205 o Later, however, instantiate_class_template called pushdecl
2206 on the newdecl to perform name injection. But, pushdecl in
2207 turn called duplicate_decls when it discovered that another
2208 declaration of a global function with the same name already
2211 o Here, in duplicate_decls, we decided to clobber newdecl.
2213 If we're going to do that, we'd better make sure that
2214 olddecl, and not newdecl, is on the list of
2215 instantiations so that if we try to do the instantiation
2216 again we won't get the clobbered declaration. */
2217 reregister_specialization (newdecl,
2223 size_t size = tree_code_size (TREE_CODE (olddecl));
2224 memcpy ((char *) olddecl + sizeof (struct tree_common),
2225 (char *) newdecl + sizeof (struct tree_common),
2226 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2227 switch (TREE_CODE (olddecl))
2237 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2238 (char *) newdecl + sizeof (struct tree_decl_common),
2239 size - sizeof (struct tree_decl_common)
2240 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2244 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2245 (char *) newdecl + sizeof (struct tree_decl_common),
2246 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2247 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2251 DECL_UID (olddecl) = olddecl_uid;
2253 DECL_FRIEND_P (olddecl) = 1;
2256 DECL_ANTICIPATED (olddecl) = 1;
2257 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2260 /* NEWDECL contains the merged attribute lists.
2261 Update OLDDECL to be the same. */
2262 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2264 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2265 so that encode_section_info has a chance to look at the new decl
2266 flags and attributes. */
2267 if (DECL_RTL_SET_P (olddecl)
2268 && (TREE_CODE (olddecl) == FUNCTION_DECL
2269 || (TREE_CODE (olddecl) == VAR_DECL
2270 && TREE_STATIC (olddecl))))
2271 make_decl_rtl (olddecl);
2273 /* The NEWDECL will no longer be needed. Because every out-of-class
2274 declaration of a member results in a call to duplicate_decls,
2275 freeing these nodes represents in a significant savings. */
2281 /* Return zero if the declaration NEWDECL is valid
2282 when the declaration OLDDECL (assumed to be for the same name)
2283 has already been seen.
2284 Otherwise return an error message format string with a %s
2285 where the identifier should go. */
2288 redeclaration_error_message (tree newdecl, tree olddecl)
2290 if (TREE_CODE (newdecl) == TYPE_DECL)
2292 /* Because C++ can put things into name space for free,
2293 constructs like "typedef struct foo { ... } foo"
2294 would look like an erroneous redeclaration. */
2295 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2298 return G_("redefinition of %q#D");
2300 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2302 /* If this is a pure function, its olddecl will actually be
2303 the original initialization to `0' (which we force to call
2304 abort()). Don't complain about redefinition in this case. */
2305 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2306 && DECL_INITIAL (olddecl) == NULL_TREE)
2309 /* If both functions come from different namespaces, this is not
2310 a redeclaration - this is a conflict with a used function. */
2311 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2312 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2313 && ! decls_match (olddecl, newdecl))
2314 return G_("%qD conflicts with used function");
2316 /* We'll complain about linkage mismatches in
2317 warn_extern_redeclared_static. */
2319 /* Defining the same name twice is no good. */
2320 if (DECL_INITIAL (olddecl) != NULL_TREE
2321 && DECL_INITIAL (newdecl) != NULL_TREE)
2323 if (DECL_NAME (olddecl) == NULL_TREE)
2324 return G_("%q#D not declared in class");
2325 else if (!GNU_INLINE_P (olddecl)
2326 || GNU_INLINE_P (newdecl))
2327 return G_("redefinition of %q#D");
2330 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2332 bool olda = GNU_INLINE_P (olddecl);
2333 bool newa = GNU_INLINE_P (newdecl);
2338 return G_("%q+D redeclared inline with "
2339 "%<gnu_inline%> attribute");
2341 return G_("%q+D redeclared inline without "
2342 "%<gnu_inline%> attribute");
2348 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2352 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2354 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2355 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2356 return G_("redefinition of %q#D");
2360 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2361 || (DECL_TEMPLATE_RESULT (newdecl)
2362 == DECL_TEMPLATE_RESULT (olddecl)))
2365 nt = DECL_TEMPLATE_RESULT (newdecl);
2366 if (DECL_TEMPLATE_INFO (nt))
2367 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2368 ot = DECL_TEMPLATE_RESULT (olddecl);
2369 if (DECL_TEMPLATE_INFO (ot))
2370 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2371 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2372 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2373 return G_("redefinition of %q#D");
2375 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2377 bool olda = GNU_INLINE_P (ot);
2378 bool newa = GNU_INLINE_P (nt);
2383 return G_("%q+D redeclared inline with "
2384 "%<gnu_inline%> attribute");
2386 return G_("%q+D redeclared inline without "
2387 "%<gnu_inline%> attribute");
2391 /* Core issue #226 (C++0x):
2393 If a friend function template declaration specifies a
2394 default template-argument, that declaration shall be a
2395 definition and shall be the only declaration of the
2396 function template in the translation unit. */
2397 if ((cxx_dialect != cxx98)
2398 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2399 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2400 /*is_primary=*/1, /*is_partial=*/0,
2401 /*is_friend_decl=*/2))
2402 return G_("redeclaration of friend %q#D "
2403 "may not have default template arguments");
2407 else if (TREE_CODE (newdecl) == VAR_DECL
2408 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2409 && (! DECL_LANG_SPECIFIC (olddecl)
2410 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2411 || DECL_THREAD_LOCAL_P (newdecl)))
2413 /* Only variables can be thread-local, and all declarations must
2414 agree on this property. */
2415 if (DECL_THREAD_LOCAL_P (newdecl))
2416 return G_("thread-local declaration of %q#D follows "
2417 "non-thread-local declaration");
2419 return G_("non-thread-local declaration of %q#D follows "
2420 "thread-local declaration");
2422 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2424 /* The objects have been declared at namespace scope. If either
2425 is a member of an anonymous union, then this is an invalid
2426 redeclaration. For example:
2432 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2433 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2434 return G_("redeclaration of %q#D");
2435 /* If at least one declaration is a reference, there is no
2436 conflict. For example:
2442 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2444 /* Reject two definitions. */
2445 return G_("redefinition of %q#D");
2449 /* Objects declared with block scope: */
2450 /* Reject two definitions, and reject a definition
2451 together with an external reference. */
2452 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2453 return G_("redeclaration of %q#D");
2458 /* Hash and equality functions for the named_label table. */
2461 named_label_entry_hash (const void *data)
2463 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2464 return DECL_UID (ent->label_decl);
2468 named_label_entry_eq (const void *a, const void *b)
2470 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2471 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2472 return ent_a->label_decl == ent_b->label_decl;
2475 /* Create a new label, named ID. */
2478 make_label_decl (tree id, int local_p)
2480 struct named_label_entry *ent;
2484 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2486 DECL_CONTEXT (decl) = current_function_decl;
2487 DECL_MODE (decl) = VOIDmode;
2488 C_DECLARED_LABEL_FLAG (decl) = local_p;
2490 /* Say where one reference is to the label, for the sake of the
2491 error if it is not defined. */
2492 DECL_SOURCE_LOCATION (decl) = input_location;
2494 /* Record the fact that this identifier is bound to this label. */
2495 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2497 /* Create the label htab for the function on demand. */
2499 named_labels = htab_create_ggc (13, named_label_entry_hash,
2500 named_label_entry_eq, NULL);
2502 /* Record this label on the list of labels used in this function.
2503 We do this before calling make_label_decl so that we get the
2504 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2505 ent = ggc_alloc_cleared_named_label_entry ();
2506 ent->label_decl = decl;
2508 slot = htab_find_slot (named_labels, ent, INSERT);
2509 gcc_assert (*slot == NULL);
2515 /* Look for a label named ID in the current function. If one cannot
2516 be found, create one. (We keep track of used, but undefined,
2517 labels, and complain about them at the end of a function.) */
2520 lookup_label (tree id)
2524 timevar_push (TV_NAME_LOOKUP);
2525 /* You can't use labels at global scope. */
2526 if (current_function_decl == NULL_TREE)
2528 error ("label %qE referenced outside of any function", id);
2529 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2532 /* See if we've already got this label. */
2533 decl = IDENTIFIER_LABEL_VALUE (id);
2534 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2535 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2537 decl = make_label_decl (id, /*local_p=*/0);
2538 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2541 /* Declare a local label named ID. */
2544 declare_local_label (tree id)
2547 cp_label_binding *bind;
2549 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2550 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2551 bind = VEC_safe_push (cp_label_binding, gc,
2552 current_binding_level->shadowed_labels, NULL);
2553 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2555 decl = make_label_decl (id, /*local_p=*/1);
2561 /* Returns nonzero if it is ill-formed to jump past the declaration of
2562 DECL. Returns 2 if it's also a real problem. */
2565 decl_jump_unsafe (tree decl)
2567 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2568 with automatic storage duration is not in scope to a point where it is
2569 in scope is ill-formed unless the variable has scalar type, class type
2570 with a trivial default constructor and a trivial destructor, a
2571 cv-qualified version of one of these types, or an array of one of the
2572 preceding types and is declared without an initializer (8.5). */
2573 tree type = TREE_TYPE (decl);
2575 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2576 || type == error_mark_node)
2579 type = strip_array_types (type);
2581 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2582 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2585 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2591 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2594 identify_goto (tree decl, const location_t *locus)
2597 permerror (input_location, "jump to label %qD", decl);
2599 permerror (input_location, "jump to case label");
2601 permerror (*locus, " from here");
2604 /* Check that a single previously seen jump to a newly defined label
2605 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2606 the jump context; NAMES are the names in scope in LEVEL at the jump
2607 context; LOCUS is the source position of the jump or 0. Returns
2608 true if all is well. */
2611 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2612 bool exited_omp, const location_t *locus)
2614 struct cp_binding_level *b;
2615 bool identified = false, saw_eh = false, saw_omp = false;
2619 identify_goto (decl, locus);
2620 error (" exits OpenMP structured block");
2621 identified = saw_omp = true;
2624 for (b = current_binding_level; b ; b = b->level_chain)
2626 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2628 for (new_decls = b->names; new_decls != old_decls;
2629 new_decls = DECL_CHAIN (new_decls))
2631 int problem = decl_jump_unsafe (new_decls);
2637 identify_goto (decl, locus);
2641 error (" crosses initialization of %q+#D", new_decls);
2643 permerror (input_location, " enters scope of %q+#D which has "
2644 "non-trivial destructor", new_decls);
2649 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2653 identify_goto (decl, locus);
2656 if (b->kind == sk_try)
2657 error (" enters try block");
2659 error (" enters catch block");
2662 if (b->kind == sk_omp && !saw_omp)
2666 identify_goto (decl, locus);
2669 error (" enters OpenMP structured block");
2678 check_previous_goto (tree decl, struct named_label_use_entry *use)
2680 check_previous_goto_1 (decl, use->binding_level,
2681 use->names_in_scope, use->in_omp_scope,
2682 &use->o_goto_locus);
2686 check_switch_goto (struct cp_binding_level* level)
2688 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2691 /* Check that a new jump to a label DECL is OK. Called by
2692 finish_goto_stmt. */
2695 check_goto (tree decl)
2697 struct named_label_entry *ent, dummy;
2698 bool saw_catch = false, identified = false;
2702 /* We can't know where a computed goto is jumping.
2703 So we assume that it's OK. */
2704 if (TREE_CODE (decl) != LABEL_DECL)
2707 /* We didn't record any information about this label when we created it,
2708 and there's not much point since it's trivial to analyze as a return. */
2709 if (decl == cdtor_label)
2712 dummy.label_decl = decl;
2713 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2714 gcc_assert (ent != NULL);
2716 /* If the label hasn't been defined yet, defer checking. */
2717 if (! DECL_INITIAL (decl))
2719 struct named_label_use_entry *new_use;
2721 /* Don't bother creating another use if the last goto had the
2722 same data, and will therefore create the same set of errors. */
2724 && ent->uses->names_in_scope == current_binding_level->names)
2727 new_use = ggc_alloc_named_label_use_entry ();
2728 new_use->binding_level = current_binding_level;
2729 new_use->names_in_scope = current_binding_level->names;
2730 new_use->o_goto_locus = input_location;
2731 new_use->in_omp_scope = false;
2733 new_use->next = ent->uses;
2734 ent->uses = new_use;
2738 if (ent->in_try_scope || ent->in_catch_scope
2739 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2741 permerror (input_location, "jump to label %q+D", decl);
2742 permerror (input_location, " from here");
2746 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2748 int u = decl_jump_unsafe (bad);
2750 if (u > 1 && DECL_ARTIFICIAL (bad))
2752 /* Can't skip init of __exception_info. */
2753 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2757 error (" skips initialization of %q+#D", bad);
2759 permerror (input_location, " enters scope of %q+#D which has "
2760 "non-trivial destructor", bad);
2763 if (ent->in_try_scope)
2764 error (" enters try block");
2765 else if (ent->in_catch_scope && !saw_catch)
2766 error (" enters catch block");
2768 if (ent->in_omp_scope)
2769 error (" enters OpenMP structured block");
2770 else if (flag_openmp)
2772 struct cp_binding_level *b;
2773 for (b = current_binding_level; b ; b = b->level_chain)
2775 if (b == ent->binding_level)
2777 if (b->kind == sk_omp)
2781 permerror (input_location, "jump to label %q+D", decl);
2782 permerror (input_location, " from here");
2785 error (" exits OpenMP structured block");
2792 /* Check that a return is ok wrt OpenMP structured blocks.
2793 Called by finish_return_stmt. Returns true if all is well. */
2796 check_omp_return (void)
2798 struct cp_binding_level *b;
2799 for (b = current_binding_level; b ; b = b->level_chain)
2800 if (b->kind == sk_omp)
2802 error ("invalid exit from OpenMP structured block");
2808 /* Define a label, specifying the location in the source file.
2809 Return the LABEL_DECL node for the label. */
2812 define_label (location_t location, tree name)
2814 struct named_label_entry *ent, dummy;
2815 struct cp_binding_level *p;
2818 timevar_push (TV_NAME_LOOKUP);
2820 decl = lookup_label (name);
2822 dummy.label_decl = decl;
2823 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2824 gcc_assert (ent != NULL);
2826 /* After labels, make any new cleanups in the function go into their
2827 own new (temporary) binding contour. */
2828 for (p = current_binding_level;
2829 p->kind != sk_function_parms;
2831 p->more_cleanups_ok = 0;
2833 if (name == get_identifier ("wchar_t"))
2834 permerror (input_location, "label named wchar_t");
2836 if (DECL_INITIAL (decl) != NULL_TREE)
2838 error ("duplicate label %qD", decl);
2839 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2843 struct named_label_use_entry *use;
2845 /* Mark label as having been defined. */
2846 DECL_INITIAL (decl) = error_mark_node;
2847 /* Say where in the source. */
2848 DECL_SOURCE_LOCATION (decl) = location;
2850 ent->binding_level = current_binding_level;
2851 ent->names_in_scope = current_binding_level->names;
2853 for (use = ent->uses; use ; use = use->next)
2854 check_previous_goto (decl, use);
2858 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2863 struct cp_binding_level *level;
2864 struct cp_switch *next;
2865 /* The SWITCH_STMT being built. */
2867 /* A splay-tree mapping the low element of a case range to the high
2868 element, or NULL_TREE if there is no high element. Used to
2869 determine whether or not a new case label duplicates an old case
2870 label. We need a tree, rather than simply a hash table, because
2871 of the GNU case range extension. */
2875 /* A stack of the currently active switch statements. The innermost
2876 switch statement is on the top of the stack. There is no need to
2877 mark the stack for garbage collection because it is only active
2878 during the processing of the body of a function, and we never
2879 collect at that point. */
2881 static struct cp_switch *switch_stack;
2883 /* Called right after a switch-statement condition is parsed.
2884 SWITCH_STMT is the switch statement being parsed. */
2887 push_switch (tree switch_stmt)
2889 struct cp_switch *p = XNEW (struct cp_switch);
2890 p->level = current_binding_level;
2891 p->next = switch_stack;
2892 p->switch_stmt = switch_stmt;
2893 p->cases = splay_tree_new (case_compare, NULL, NULL);
2900 struct cp_switch *cs = switch_stack;
2901 location_t switch_location;
2903 /* Emit warnings as needed. */
2904 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2905 if (!processing_template_decl)
2906 c_do_switch_warnings (cs->cases, switch_location,
2907 SWITCH_STMT_TYPE (cs->switch_stmt),
2908 SWITCH_STMT_COND (cs->switch_stmt));
2910 splay_tree_delete (cs->cases);
2911 switch_stack = switch_stack->next;
2915 /* Note that we've seen a definition of a case label, and complain if this
2916 is a bad place for one. */
2919 finish_case_label (location_t loc, tree low_value, tree high_value)
2922 struct cp_binding_level *p;
2924 if (processing_template_decl)
2928 /* For templates, just add the case label; we'll do semantic
2929 analysis at instantiation-time. */
2930 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2931 return add_stmt (build_case_label (loc, low_value, high_value, label));
2934 /* Find the condition on which this switch statement depends. */
2935 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2936 if (cond && TREE_CODE (cond) == TREE_LIST)
2937 cond = TREE_VALUE (cond);
2939 if (!check_switch_goto (switch_stack->level))
2940 return error_mark_node;
2943 low_value = cxx_constant_value (low_value);
2945 high_value = cxx_constant_value (high_value);
2947 r = c_add_case_label (loc, switch_stack->cases, cond,
2948 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2949 low_value, high_value);
2951 /* After labels, make any new cleanups in the function go into their
2952 own new (temporary) binding contour. */
2953 for (p = current_binding_level;
2954 p->kind != sk_function_parms;
2956 p->more_cleanups_ok = 0;
2961 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2964 typename_hash (const void* k)
2967 const_tree const t = (const_tree) k;
2969 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2970 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2975 typedef struct typename_info {
2983 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2984 really of type `typename_info*' */
2987 typename_compare (const void * k1, const void * k2)
2989 const_tree const t1 = (const_tree) k1;
2990 const typename_info *const t2 = (const typename_info *) k2;
2992 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2993 && TYPE_CONTEXT (t1) == t2->scope
2994 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2995 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2996 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2999 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3000 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3002 Returns the new TYPENAME_TYPE. */
3004 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3007 build_typename_type (tree context, tree name, tree fullname,
3008 enum tag_types tag_type)
3016 if (typename_htab == NULL)
3017 typename_htab = htab_create_ggc (61, &typename_hash,
3018 &typename_compare, NULL);
3020 ti.scope = FROB_CONTEXT (context);
3022 ti.template_id = fullname;
3023 ti.enum_p = tag_type == enum_type;
3024 ti.class_p = (tag_type == class_type
3025 || tag_type == record_type
3026 || tag_type == union_type);
3027 hash = (htab_hash_pointer (ti.scope)
3028 ^ htab_hash_pointer (ti.name));
3030 /* See if we already have this type. */
3031 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3036 /* Build the TYPENAME_TYPE. */
3037 t = cxx_make_type (TYPENAME_TYPE);
3038 TYPE_CONTEXT (t) = ti.scope;
3039 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3040 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3041 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3043 /* Build the corresponding TYPE_DECL. */
3044 d = build_decl (input_location, TYPE_DECL, name, t);
3045 TYPE_NAME (TREE_TYPE (d)) = d;
3046 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3047 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3048 DECL_ARTIFICIAL (d) = 1;
3050 /* Store it in the hash table. */
3053 /* TYPENAME_TYPEs must always be compared structurally, because
3054 they may or may not resolve down to another type depending on
3055 the currently open classes. */
3056 SET_TYPE_STRUCTURAL_EQUALITY (t);
3062 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3063 provided to name the type. Returns an appropriate type, unless an
3064 error occurs, in which case error_mark_node is returned. If we
3065 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3066 return that, rather than the _TYPE it corresponds to, in other
3067 cases we look through the type decl. If TF_ERROR is set, complain
3068 about errors, otherwise be quiet. */
3071 make_typename_type (tree context, tree name, enum tag_types tag_type,
3072 tsubst_flags_t complain)
3078 if (name == error_mark_node
3079 || context == NULL_TREE
3080 || context == error_mark_node)
3081 return error_mark_node;
3085 if (!(TYPE_LANG_SPECIFIC (name)
3086 && (CLASSTYPE_IS_TEMPLATE (name)
3087 || CLASSTYPE_USE_TEMPLATE (name))))
3088 name = TYPE_IDENTIFIER (name);
3090 /* Create a TEMPLATE_ID_EXPR for the type. */
3091 name = build_nt (TEMPLATE_ID_EXPR,
3092 CLASSTYPE_TI_TEMPLATE (name),
3093 CLASSTYPE_TI_ARGS (name));
3095 else if (TREE_CODE (name) == TYPE_DECL)
3096 name = DECL_NAME (name);
3100 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3102 name = TREE_OPERAND (name, 0);
3103 if (TREE_CODE (name) == TEMPLATE_DECL)
3104 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3105 else if (TREE_CODE (name) == OVERLOAD)
3107 error ("%qD is not a type", name);
3108 return error_mark_node;
3111 if (TREE_CODE (name) == TEMPLATE_DECL)
3113 error ("%qD used without template parameters", name);
3114 return error_mark_node;
3116 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3117 gcc_assert (TYPE_P (context));
3119 if (!MAYBE_CLASS_TYPE_P (context))
3121 if (complain & tf_error)
3122 error ("%q#T is not a class", context);
3123 return error_mark_node;
3126 /* When the CONTEXT is a dependent type, NAME could refer to a
3127 dependent base class of CONTEXT. But look inside it anyway
3128 if CONTEXT is a currently open scope, in case it refers to a
3129 member of the current instantiation or a non-dependent base;
3130 lookup will stop when we hit a dependent base. */
3131 if (!dependent_scope_p (context))
3132 /* We should only set WANT_TYPE when we're a nested typename type.
3133 Then we can give better diagnostics if we find a non-type. */
3134 t = lookup_field (context, name, 2, /*want_type=*/true);
3138 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3139 return build_typename_type (context, name, fullname, tag_type);
3141 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3145 if (complain & tf_error)
3146 error (want_template ? "no class template named %q#T in %q#T"
3147 : "no type named %q#T in %q#T", name, context);
3148 return error_mark_node;
3151 /* Pull out the template from an injected-class-name (or multiple). */
3153 t = maybe_get_template_decl_from_type_decl (t);
3155 if (TREE_CODE (t) == TREE_LIST)
3157 if (complain & tf_error)
3159 error ("lookup of %qT in %qT is ambiguous", name, context);
3160 print_candidates (t);
3162 return error_mark_node;
3165 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3167 if (complain & tf_error)
3168 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3170 return error_mark_node;
3172 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3174 if (complain & tf_error)
3175 error ("%<typename %T::%D%> names %q#T, which is not a type",
3177 return error_mark_node;
3180 if (complain & tf_error)
3181 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3183 /* If we are currently parsing a template and if T is a typedef accessed
3184 through CONTEXT then we need to remember and check access of T at
3185 template instantiation time. */
3186 add_typedef_to_current_template_for_access_check (t, context, input_location);
3189 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3191 /*entering_scope=*/0,
3192 tf_warning_or_error | tf_user);
3194 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3200 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3201 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3202 in which case error_mark_node is returned.
3204 If PARM_LIST is non-NULL, also make sure that the template parameter
3205 list of TEMPLATE_DECL matches.
3207 If COMPLAIN zero, don't complain about any errors that occur. */
3210 make_unbound_class_template (tree context, tree name, tree parm_list,
3211 tsubst_flags_t complain)
3217 name = TYPE_IDENTIFIER (name);
3218 else if (DECL_P (name))
3219 name = DECL_NAME (name);
3220 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3222 if (!dependent_type_p (context)
3223 || currently_open_class (context))
3225 tree tmpl = NULL_TREE;
3227 if (MAYBE_CLASS_TYPE_P (context))
3228 tmpl = lookup_field (context, name, 0, false);
3230 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3232 if (complain & tf_error)
3233 error ("no class template named %q#T in %q#T", name, context);
3234 return error_mark_node;
3238 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3240 if (complain & tf_error)
3242 error ("template parameters do not match template");
3243 error ("%q+D declared here", tmpl);
3245 return error_mark_node;
3248 if (complain & tf_error)
3249 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3254 /* Build the UNBOUND_CLASS_TEMPLATE. */
3255 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3256 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3257 TREE_TYPE (t) = NULL_TREE;
3258 SET_TYPE_STRUCTURAL_EQUALITY (t);
3260 /* Build the corresponding TEMPLATE_DECL. */
3261 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3262 TYPE_NAME (TREE_TYPE (d)) = d;
3263 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3264 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3265 DECL_ARTIFICIAL (d) = 1;
3266 DECL_TEMPLATE_PARMS (d) = parm_list;
3273 /* Push the declarations of builtin types into the namespace.
3274 RID_INDEX is the index of the builtin type in the array
3275 RID_POINTERS. NAME is the name used when looking up the builtin
3276 type. TYPE is the _TYPE node for the builtin type. */
3279 record_builtin_type (enum rid rid_index,
3283 tree rname = NULL_TREE, tname = NULL_TREE;
3284 tree tdecl = NULL_TREE;
3286 if ((int) rid_index < (int) RID_MAX)
3287 rname = ridpointers[(int) rid_index];
3289 tname = get_identifier (name);
3291 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3292 eliminated. Built-in types should not be looked up name; their
3293 names are keywords that the parser can recognize. However, there
3294 is code in c-common.c that uses identifier_global_value to look
3295 up built-in types by name. */
3298 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3299 DECL_ARTIFICIAL (tdecl) = 1;
3300 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3306 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3307 DECL_ARTIFICIAL (tdecl) = 1;
3309 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3312 if (!TYPE_NAME (type))
3313 TYPE_NAME (type) = tdecl;
3316 debug_hooks->type_decl (tdecl, 0);
3319 /* Record one of the standard Java types.
3320 * Declare it as having the given NAME.
3321 * If SIZE > 0, it is the size of one of the integral types;
3322 * otherwise it is the negative of the size of one of the other types. */
3325 record_builtin_java_type (const char* name, int size)
3329 type = build_nonstandard_integer_type (size, 0);
3330 else if (size > -32)
3333 /* "__java_char" or ""__java_boolean". */
3334 type = build_nonstandard_integer_type (-size, 1);
3335 /* Get the signed type cached and attached to the unsigned type,
3336 so it doesn't get garbage-collected at "random" times,
3337 causing potential codegen differences out of different UIDs
3338 and different alias set numbers. */
3339 stype = build_nonstandard_integer_type (-size, 0);
3340 TREE_CHAIN (type) = stype;
3341 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3344 { /* "__java_float" or ""__java_double". */
3345 type = make_node (REAL_TYPE);
3346 TYPE_PRECISION (type) = - size;
3349 record_builtin_type (RID_MAX, name, type);
3350 decl = TYPE_NAME (type);
3352 /* Suppress generate debug symbol entries for these types,
3353 since for normal C++ they are just clutter.
3354 However, push_lang_context undoes this if extern "Java" is seen. */
3355 DECL_IGNORED_P (decl) = 1;
3357 TYPE_FOR_JAVA (type) = 1;
3361 /* Push a type into the namespace so that the back ends ignore it. */
3364 record_unknown_type (tree type, const char* name)
3366 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3367 TYPE_DECL, get_identifier (name), type));
3368 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3369 DECL_IGNORED_P (decl) = 1;
3370 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3371 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3372 TYPE_ALIGN (type) = 1;
3373 TYPE_USER_ALIGN (type) = 0;
3374 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3377 /* A string for which we should create an IDENTIFIER_NODE at
3380 typedef struct predefined_identifier
3382 /* The name of the identifier. */
3383 const char *const name;
3384 /* The place where the IDENTIFIER_NODE should be stored. */
3386 /* Nonzero if this is the name of a constructor or destructor. */
3387 const int ctor_or_dtor_p;
3388 } predefined_identifier;
3390 /* Create all the predefined identifiers. */
3393 initialize_predefined_identifiers (void)
3395 const predefined_identifier *pid;
3397 /* A table of identifiers to create at startup. */
3398 static const predefined_identifier predefined_identifiers[] = {
3399 { "C++", &lang_name_cplusplus, 0 },
3400 { "C", &lang_name_c, 0 },
3401 { "Java", &lang_name_java, 0 },
3402 /* Some of these names have a trailing space so that it is
3403 impossible for them to conflict with names written by users. */
3404 { "__ct ", &ctor_identifier, 1 },
3405 { "__base_ctor ", &base_ctor_identifier, 1 },
3406 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3407 { "__dt ", &dtor_identifier, 1 },
3408 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3409 { "__base_dtor ", &base_dtor_identifier, 1 },
3410 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3411 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3412 { "nelts", &nelts_identifier, 0 },
3413 { THIS_NAME, &this_identifier, 0 },
3414 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3415 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3416 { "_vptr", &vptr_identifier, 0 },
3417 { "__vtt_parm", &vtt_parm_identifier, 0 },
3418 { "::", &global_scope_name, 0 },
3419 { "std", &std_identifier, 0 },
3423 for (pid = predefined_identifiers; pid->name; ++pid)
3425 *pid->node = get_identifier (pid->name);
3426 if (pid->ctor_or_dtor_p)
3427 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3431 /* Create the predefined scalar types of C,
3432 and some nodes representing standard constants (0, 1, (void *)0).
3433 Initialize the global binding level.
3434 Make definitions for built-in primitive functions. */
3437 cxx_init_decl_processing (void)
3440 tree void_ftype_ptr;
3442 build_common_tree_nodes (flag_signed_char);
3444 /* Create all the identifiers we need. */
3445 initialize_predefined_identifiers ();
3447 /* Create the global variables. */
3448 push_to_top_level ();
3450 current_function_decl = NULL_TREE;
3451 current_binding_level = NULL;
3452 /* Enter the global namespace. */
3453 gcc_assert (global_namespace == NULL_TREE);
3454 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3456 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3457 TREE_PUBLIC (global_namespace) = 1;
3458 begin_scope (sk_namespace, global_namespace);
3460 current_lang_name = NULL_TREE;
3462 if (flag_visibility_ms_compat)
3463 default_visibility = VISIBILITY_HIDDEN;
3466 current_lang_name = lang_name_c;
3468 /* Create the `std' namespace. */
3469 push_namespace (std_identifier);
3470 std_node = current_namespace;
3473 c_common_nodes_and_builtins ();
3475 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3476 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3477 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3478 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3479 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3480 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3481 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3482 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3484 integer_two_node = build_int_cst (NULL_TREE, 2);
3486 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3487 truthvalue_type_node = boolean_type_node;
3488 truthvalue_false_node = boolean_false_node;
3489 truthvalue_true_node = boolean_true_node;
3491 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3492 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3493 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3496 record_builtin_type (RID_MAX, NULL, string_type_node);
3499 delta_type_node = ptrdiff_type_node;
3500 vtable_index_type = ptrdiff_type_node;
3502 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3503 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3504 void_ftype_ptr = build_function_type_list (void_type_node,
3505 ptr_type_node, NULL_TREE);
3507 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3509 /* C++ extensions */
3511 unknown_type_node = make_node (LANG_TYPE);
3512 record_unknown_type (unknown_type_node, "unknown type");
3514 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3515 TREE_TYPE (unknown_type_node) = unknown_type_node;
3517 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3519 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3520 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3522 init_list_type_node = make_node (LANG_TYPE);
3523 record_unknown_type (init_list_type_node, "init list");
3526 /* Make sure we get a unique function type, so we can give
3527 its pointer type a name. (This wins for gdb.) */
3528 tree vfunc_type = make_node (FUNCTION_TYPE);
3529 TREE_TYPE (vfunc_type) = integer_type_node;
3530 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3531 layout_type (vfunc_type);
3533 vtable_entry_type = build_pointer_type (vfunc_type);
3535 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3538 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3539 layout_type (vtbl_type_node);
3540 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3541 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3542 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3543 layout_type (vtbl_ptr_type_node);
3544 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3546 push_namespace (get_identifier ("__cxxabiv1"));
3547 abi_node = current_namespace;
3550 global_type_node = make_node (LANG_TYPE);
3551 record_unknown_type (global_type_node, "global type");
3554 current_lang_name = lang_name_cplusplus;
3557 tree newtype, deltype;
3558 tree ptr_ftype_sizetype;
3562 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3563 if (cxx_dialect == cxx98)
3566 tree bad_alloc_type_node;
3567 tree bad_alloc_decl;
3569 push_namespace (std_identifier);
3570 bad_alloc_id = get_identifier ("bad_alloc");
3571 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3572 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3574 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3575 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3579 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3582 new_eh_spec = noexcept_false_spec;
3584 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3585 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3586 push_cp_library_fn (NEW_EXPR, newtype);
3587 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3588 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3589 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3591 nullptr_type_node = make_node (NULLPTR_TYPE);
3592 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3593 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3594 TYPE_UNSIGNED (nullptr_type_node) = 1;
3595 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3596 SET_TYPE_MODE (nullptr_type_node, Pmode);
3597 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3598 nullptr_node = build_int_cst (nullptr_type_node, 0);
3602 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3604 /* Perform other language dependent initializations. */
3605 init_class_processing ();
3606 init_rtti_processing ();
3607 init_template_processing ();
3609 if (flag_exceptions)
3610 init_exception_processing ();
3612 if (! supports_one_only ())
3615 make_fname_decl = cp_make_fname_decl;
3616 start_fname_decls ();
3618 /* Show we use EH for cleanups. */
3619 if (flag_exceptions)
3620 using_eh_for_cleanups ();
3623 /* Generate an initializer for a function naming variable from
3624 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3625 filled in with the type of the init. */
3628 cp_fname_init (const char* name, tree *type_p)
3630 tree domain = NULL_TREE;
3632 tree init = NULL_TREE;
3637 length = strlen (name);
3638 domain = build_index_type (size_int (length));
3639 init = build_string (length + 1, name);
3642 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3643 type = build_cplus_array_type (type, domain);
3648 TREE_TYPE (init) = type;
3650 init = error_mark_node;
3655 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3656 the decl, LOC is the location to give the decl, NAME is the
3657 initialization string and TYPE_DEP indicates whether NAME depended
3658 on the type of the function. We make use of that to detect
3659 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3660 at the point of first use, so we mustn't push the decl now. */
3663 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3665 const char *const name = (type_dep && processing_template_decl
3666 ? NULL : fname_as_string (type_dep));
3668 tree init = cp_fname_init (name, &type);
3669 tree decl = build_decl (loc, VAR_DECL, id, type);
3672 free (CONST_CAST (char *, name));
3674 /* As we're using pushdecl_with_scope, we must set the context. */
3675 DECL_CONTEXT (decl) = current_function_decl;
3676 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3678 TREE_STATIC (decl) = 1;
3679 TREE_READONLY (decl) = 1;
3680 DECL_ARTIFICIAL (decl) = 1;
3682 TREE_USED (decl) = 1;
3684 if (current_function_decl)
3686 struct cp_binding_level *b = current_binding_level;
3687 while (b->level_chain->kind != sk_function_parms)
3689 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3690 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3691 LOOKUP_ONLYCONVERTING);
3694 pushdecl_top_level_and_finish (decl, init);
3700 builtin_function_1 (tree decl, tree context, bool is_global)
3702 tree id = DECL_NAME (decl);
3703 const char *name = IDENTIFIER_POINTER (id);
3705 retrofit_lang_decl (decl);
3707 DECL_ARTIFICIAL (decl) = 1;
3708 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3709 SET_DECL_LANGUAGE (decl, lang_c);
3710 /* Runtime library routines are, by definition, available in an
3711 external shared object. */
3712 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3713 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3715 DECL_CONTEXT (decl) = context;
3718 pushdecl_top_level (decl);
3722 /* A function in the user's namespace should have an explicit
3723 declaration before it is used. Mark the built-in function as
3724 anticipated but not actually declared. */
3725 if (name[0] != '_' || name[1] != '_')
3726 DECL_ANTICIPATED (decl) = 1;
3727 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3729 size_t len = strlen (name);
3731 /* Treat __*_chk fortification functions as anticipated as well,
3732 unless they are __builtin_*. */
3733 if (len > strlen ("___chk")
3734 && memcmp (name + len - strlen ("_chk"),
3735 "_chk", strlen ("_chk") + 1) == 0)
3736 DECL_ANTICIPATED (decl) = 1;
3743 cxx_builtin_function (tree decl)
3745 tree id = DECL_NAME (decl);
3746 const char *name = IDENTIFIER_POINTER (id);
3747 /* All builtins that don't begin with an '_' should additionally
3748 go in the 'std' namespace. */
3751 tree decl2 = copy_node(decl);
3752 push_namespace (std_identifier);
3753 builtin_function_1 (decl2, std_node, false);
3757 return builtin_function_1 (decl, NULL_TREE, false);
3760 /* Like cxx_builtin_function, but guarantee the function is added to the global
3761 scope. This is to allow function specific options to add new machine
3762 dependent builtins when the target ISA changes via attribute((target(...)))
3763 which saves space on program startup if the program does not use non-generic
3767 cxx_builtin_function_ext_scope (tree decl)
3770 tree id = DECL_NAME (decl);
3771 const char *name = IDENTIFIER_POINTER (id);
3772 /* All builtins that don't begin with an '_' should additionally
3773 go in the 'std' namespace. */
3776 tree decl2 = copy_node(decl);
3777 push_namespace (std_identifier);
3778 builtin_function_1 (decl2, std_node, true);
3782 return builtin_function_1 (decl, NULL_TREE, true);
3785 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3786 function. Not called directly. */
3789 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3791 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3792 DECL_EXTERNAL (fn) = 1;
3793 TREE_PUBLIC (fn) = 1;
3794 DECL_ARTIFICIAL (fn) = 1;
3795 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3796 SET_DECL_LANGUAGE (fn, lang_c);
3797 /* Runtime library routines are, by definition, available in an
3798 external shared object. */
3799 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3800 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3804 /* Returns the _DECL for a library function with C linkage.
3805 We assume that such functions never throw; if this is incorrect,
3806 callers should unset TREE_NOTHROW. */
3809 build_library_fn (tree name, tree type)
3811 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3812 TREE_NOTHROW (fn) = 1;
3816 /* Returns the _DECL for a library function with C++ linkage. */
3819 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3821 tree fn = build_library_fn_1 (name, operator_code, type);
3822 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3823 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3824 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3828 /* Like build_library_fn, but takes a C string instead of an
3832 build_library_fn_ptr (const char* name, tree type)
3834 return build_library_fn (get_identifier (name), type);
3837 /* Like build_cp_library_fn, but takes a C string instead of an
3841 build_cp_library_fn_ptr (const char* name, tree type)
3843 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3846 /* Like build_library_fn, but also pushes the function so that we will
3847 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3848 may throw exceptions listed in RAISES. */
3851 push_library_fn (tree name, tree type, tree raises)
3856 type = build_exception_variant (type, raises);
3858 fn = build_library_fn (name, type);
3859 pushdecl_top_level (fn);
3863 /* Like build_cp_library_fn, but also pushes the function so that it
3864 will be found by normal lookup. */
3867 push_cp_library_fn (enum tree_code operator_code, tree type)
3869 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3876 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3880 push_void_library_fn (tree name, tree parmtypes)
3882 tree type = build_function_type (void_type_node, parmtypes);
3883 return push_library_fn (name, type, NULL_TREE);
3886 /* Like push_library_fn, but also note that this function throws
3887 and does not return. Used for __throw_foo and the like. */
3890 push_throw_library_fn (tree name, tree type)
3892 tree fn = push_library_fn (name, type, NULL_TREE);
3893 TREE_THIS_VOLATILE (fn) = 1;
3894 TREE_NOTHROW (fn) = 0;
3898 /* When we call finish_struct for an anonymous union, we create
3899 default copy constructors and such. But, an anonymous union
3900 shouldn't have such things; this function undoes the damage to the
3901 anonymous union type T.
3903 (The reason that we create the synthesized methods is that we don't
3904 distinguish `union { int i; }' from `typedef union { int i; } U'.
3905 The first is an anonymous union; the second is just an ordinary
3909 fixup_anonymous_aggr (tree t)
3913 /* Wipe out memory of synthesized methods. */
3914 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3915 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3916 TYPE_HAS_COPY_CTOR (t) = 0;
3917 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3918 TYPE_HAS_COPY_ASSIGN (t) = 0;
3919 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3921 /* Splice the implicitly generated functions out of the TYPE_METHODS
3923 q = &TYPE_METHODS (t);
3926 if (DECL_ARTIFICIAL (*q))
3927 *q = TREE_CHAIN (*q);
3929 q = &DECL_CHAIN (*q);
3932 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3933 if (TYPE_METHODS (t))
3935 tree decl = TYPE_MAIN_DECL (t);
3937 if (TREE_CODE (t) != UNION_TYPE)
3938 error_at (DECL_SOURCE_LOCATION (decl),
3939 "an anonymous struct cannot have function members");
3941 error_at (DECL_SOURCE_LOCATION (decl),
3942 "an anonymous union cannot have function members");
3945 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3946 assignment operators (because they cannot have these methods themselves).
3947 For anonymous unions this is already checked because they are not allowed
3948 in any union, otherwise we have to check it. */
3949 if (TREE_CODE (t) != UNION_TYPE)
3953 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3954 if (TREE_CODE (field) == FIELD_DECL)
3956 type = TREE_TYPE (field);
3957 if (CLASS_TYPE_P (type))
3959 if (TYPE_NEEDS_CONSTRUCTING (type))
3960 error ("member %q+#D with constructor not allowed "
3961 "in anonymous aggregate", field);
3962 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3963 error ("member %q+#D with destructor not allowed "
3964 "in anonymous aggregate", field);
3965 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3966 error ("member %q+#D with copy assignment operator "
3967 "not allowed in anonymous aggregate", field);
3973 /* Make sure that a declaration with no declarator is well-formed, i.e.
3974 just declares a tagged type or anonymous union.
3976 Returns the type declared; or NULL_TREE if none. */
3979 check_tag_decl (cp_decl_specifier_seq *declspecs)
3981 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3982 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3983 /* If a class, struct, or enum type is declared by the DECLSPECS
3984 (i.e, if a class-specifier, enum-specifier, or non-typename
3985 elaborated-type-specifier appears in the DECLSPECS),
3986 DECLARED_TYPE is set to the corresponding type. */
3987 tree declared_type = NULL_TREE;
3988 bool error_p = false;
3990 if (declspecs->multiple_types_p)
3991 error ("multiple types in one declaration");
3992 else if (declspecs->redefined_builtin_type)
3994 if (!in_system_header)
3995 permerror (input_location, "redeclaration of C++ built-in type %qT",
3996 declspecs->redefined_builtin_type);
4001 && TYPE_P (declspecs->type)
4002 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4003 && MAYBE_CLASS_TYPE_P (declspecs->type))
4004 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4005 declared_type = declspecs->type;
4006 else if (declspecs->type == error_mark_node)
4008 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4009 permerror (input_location, "declaration does not declare anything");
4010 /* Check for an anonymous union. */
4011 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4012 && TYPE_ANONYMOUS_P (declared_type))
4014 /* 7/3 In a simple-declaration, the optional init-declarator-list
4015 can be omitted only when declaring a class (clause 9) or
4016 enumeration (7.2), that is, when the decl-specifier-seq contains
4017 either a class-specifier, an elaborated-type-specifier with
4018 a class-key (9.1), or an enum-specifier. In these cases and
4019 whenever a class-specifier or enum-specifier is present in the
4020 decl-specifier-seq, the identifiers in these specifiers are among
4021 the names being declared by the declaration (as class-name,
4022 enum-names, or enumerators, depending on the syntax). In such
4023 cases, and except for the declaration of an unnamed bit-field (9.6),
4024 the decl-specifier-seq shall introduce one or more names into the
4025 program, or shall redeclare a name introduced by a previous
4026 declaration. [Example:
4027 enum { }; // ill-formed
4028 typedef class { }; // ill-formed
4032 error ("missing type-name in typedef-declaration");
4035 /* Anonymous unions are objects, so they can have specifiers. */;
4036 SET_ANON_AGGR_TYPE_P (declared_type);
4038 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4039 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4044 if (declspecs->specs[(int)ds_inline]
4045 || declspecs->specs[(int)ds_virtual])
4046 error ("%qs can only be specified for functions",
4047 declspecs->specs[(int)ds_inline]
4048 ? "inline" : "virtual");
4050 && (!current_class_type
4051 || current_scope () != current_class_type))
4052 error ("%<friend%> can only be specified inside a class");
4053 else if (declspecs->specs[(int)ds_explicit])
4054 error ("%<explicit%> can only be specified for constructors");
4055 else if (declspecs->storage_class)
4056 error ("a storage class can only be specified for objects "
4058 else if (declspecs->specs[(int)ds_const]
4059 || declspecs->specs[(int)ds_volatile]
4060 || declspecs->specs[(int)ds_restrict]
4061 || declspecs->specs[(int)ds_thread])
4062 error ("qualifiers can only be specified for objects "
4064 else if (saw_typedef)
4065 warning (0, "%<typedef%> was ignored in this declaration");
4066 else if (declspecs->specs[(int) ds_constexpr])
4067 error ("%<constexpr%> cannot be used for type declarations");
4070 return declared_type;
4073 /* Called when a declaration is seen that contains no names to declare.
4074 If its type is a reference to a structure, union or enum inherited
4075 from a containing scope, shadow that tag name for the current scope
4076 with a forward reference.
4077 If its type defines a new named structure or union
4078 or defines an enum, it is valid but we need not do anything here.
4079 Otherwise, it is an error.
4081 C++: may have to grok the declspecs to learn about static,
4082 complain for anonymous unions.
4084 Returns the TYPE declared -- or NULL_TREE if none. */
4087 shadow_tag (cp_decl_specifier_seq *declspecs)
4089 tree t = check_tag_decl (declspecs);
4094 if (declspecs->attributes)
4096 warning (0, "attribute ignored in declaration of %q+#T", t);
4097 warning (0, "attribute for %q+#T must follow the %qs keyword",
4098 t, class_key_or_enum_as_string (t));
4102 if (maybe_process_partial_specialization (t) == error_mark_node)
4105 /* This is where the variables in an anonymous union are
4106 declared. An anonymous union declaration looks like:
4108 because there is no declarator after the union, the parser
4109 sends that declaration here. */
4110 if (ANON_AGGR_TYPE_P (t))
4112 fixup_anonymous_aggr (t);
4114 if (TYPE_FIELDS (t))
4116 tree decl = grokdeclarator (/*declarator=*/NULL,
4117 declspecs, NORMAL, 0, NULL);
4118 finish_anon_union (decl);
4125 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4128 groktypename (cp_decl_specifier_seq *type_specifiers,
4129 const cp_declarator *declarator,
4130 bool is_template_arg)
4134 enum decl_context context
4135 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4136 attrs = type_specifiers->attributes;
4137 type_specifiers->attributes = NULL_TREE;
4138 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4139 if (attrs && type != error_mark_node)
4141 if (CLASS_TYPE_P (type))
4142 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4143 "outside of definition", type);
4144 else if (MAYBE_CLASS_TYPE_P (type))
4145 /* A template type parameter or other dependent type. */
4146 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4147 "type %qT without an associated declaration", type);
4149 cplus_decl_attributes (&type, attrs, 0);
4154 /* Process a DECLARATOR for a function-scope variable declaration,
4155 namespace-scope variable declaration, or function declaration.
4156 (Function definitions go through start_function; class member
4157 declarations appearing in the body of the class go through
4158 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4159 If an error occurs, the error_mark_node is returned instead.
4161 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4162 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4163 for an explicitly defaulted function, or SD_DELETED for an explicitly
4164 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4165 implicitly initialized via a default constructor. ATTRIBUTES and
4166 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4167 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4168 set, the caller is responsible for calling pop_scope. */
4171 start_decl (const cp_declarator *declarator,
4172 cp_decl_specifier_seq *declspecs,
4175 tree prefix_attributes,
4176 tree *pushed_scope_p)
4184 *pushed_scope_p = NULL_TREE;
4186 /* An object declared as __attribute__((deprecated)) suppresses
4187 warnings of uses of other deprecated items. */
4188 if (lookup_attribute ("deprecated", attributes))
4189 deprecated_state = DEPRECATED_SUPPRESS;
4191 attributes = chainon (attributes, prefix_attributes);
4193 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4196 deprecated_state = DEPRECATED_NORMAL;
4198 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4199 || decl == error_mark_node)
4200 return error_mark_node;
4202 context = CP_DECL_CONTEXT (decl);
4203 if (context != global_namespace)
4204 *pushed_scope_p = push_scope (context);
4207 /* Is it valid for this decl to have an initializer at all?
4208 If not, set INITIALIZED to zero, which will indirectly
4209 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4210 switch (TREE_CODE (decl))
4213 error ("typedef %qD is initialized (use decltype instead)", decl);
4214 return error_mark_node;
4217 if (initialized == SD_DELETED)
4218 /* We'll handle the rest of the semantics later, but we need to
4219 set this now so it's visible to duplicate_decls. */
4220 DECL_DELETED_FN (decl) = 1;
4229 if (! toplevel_bindings_p ()
4230 && DECL_EXTERNAL (decl))
4231 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4233 DECL_EXTERNAL (decl) = 0;
4234 if (toplevel_bindings_p ())
4235 TREE_STATIC (decl) = 1;
4237 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4239 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4240 record_key_method_defined (decl);
4242 /* If this is a typedef that names the class for linkage purposes
4243 (7.1.3p8), apply any attributes directly to the type. */
4244 if (TREE_CODE (decl) == TYPE_DECL
4245 && TAGGED_TYPE_P (TREE_TYPE (decl))
4246 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4247 flags = ATTR_FLAG_TYPE_IN_PLACE;
4251 /* Set attributes here so if duplicate decl, will have proper attributes. */
4252 cplus_decl_attributes (&decl, attributes, flags);
4254 /* Dllimported symbols cannot be defined. Static data members (which
4255 can be initialized in-class and dllimported) go through grokfield,
4256 not here, so we don't need to exclude those decls when checking for
4258 if (initialized && DECL_DLLIMPORT_P (decl))
4260 error ("definition of %q#D is marked %<dllimport%>", decl);
4261 DECL_DLLIMPORT_P (decl) = 0;
4264 /* If #pragma weak was used, mark the decl weak now. */
4265 maybe_apply_pragma_weak (decl);
4267 if (TREE_CODE (decl) == FUNCTION_DECL
4268 && DECL_DECLARED_INLINE_P (decl)
4269 && DECL_UNINLINABLE (decl)
4270 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4271 warning (0, "inline function %q+D given attribute noinline", decl);
4273 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4275 if (TREE_CODE (decl) == VAR_DECL)
4277 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4278 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4279 error ("%q#D is not a static member of %q#T", decl, context);
4282 if (DECL_CONTEXT (field) != context)
4284 if (!same_type_p (DECL_CONTEXT (field), context))
4285 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4286 "to be defined as %<%T::%D%>",
4287 DECL_CONTEXT (field), DECL_NAME (decl),
4288 context, DECL_NAME (decl));
4289 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4291 if (processing_specialization
4292 && template_class_depth (context) == 0
4293 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4294 error ("template header not allowed in member definition "
4295 "of explicitly specialized class");
4296 /* Static data member are tricky; an in-class initialization
4297 still doesn't provide a definition, so the in-class
4298 declaration will have DECL_EXTERNAL set, but will have an
4299 initialization. Thus, duplicate_decls won't warn
4300 about this situation, and so we check here. */
4301 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4302 error ("duplicate initialization of %qD", decl);
4303 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4305 if (declspecs->specs[(int) ds_constexpr]
4306 && !DECL_DECLARED_CONSTEXPR_P (field))
4307 error ("%qD declared %<constexpr%> outside its class", field);
4312 tree field = check_classfn (context, decl,
4313 (processing_template_decl
4314 > template_class_depth (context))
4315 ? current_template_parms
4317 if (field && field != error_mark_node
4318 && duplicate_decls (decl, field,
4319 /*newdecl_is_friend=*/false))
4323 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4324 DECL_IN_AGGR_P (decl) = 0;
4325 /* Do not mark DECL as an explicit specialization if it was not
4326 already marked as an instantiation; a declaration should
4327 never be marked as a specialization unless we know what
4328 template is being specialized. */
4329 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4331 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4333 /* [temp.expl.spec] An explicit specialization of a static data
4334 member of a template is a definition if the declaration
4335 includes an initializer; otherwise, it is a declaration.
4337 We check for processing_specialization so this only applies
4338 to the new specialization syntax. */
4339 if (!initialized && processing_specialization)
4340 DECL_EXTERNAL (decl) = 1;
4343 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4344 /* Aliases are definitions. */
4346 permerror (input_location, "declaration of %q#D outside of class is not definition",
4350 was_public = TREE_PUBLIC (decl);
4352 /* Enter this declaration into the symbol table. */
4353 decl = maybe_push_decl (decl);
4355 if (processing_template_decl)
4356 decl = push_template_decl (decl);
4357 if (decl == error_mark_node)
4358 return error_mark_node;
4360 /* Tell the back end to use or not use .common as appropriate. If we say
4361 -fconserve-space, we want this to save .data space, at the expense of
4362 wrong semantics. If we say -fno-conserve-space, we want this to
4363 produce errors about redefs; to do this we force variables into the
4365 if (flag_conserve_space
4366 && TREE_CODE (decl) == VAR_DECL
4367 && TREE_PUBLIC (decl)
4368 && !DECL_THREAD_LOCAL_P (decl)
4369 && !have_global_bss_p ())
4370 DECL_COMMON (decl) = 1;
4372 if (TREE_CODE (decl) == VAR_DECL
4373 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4374 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4376 /* This is a const variable with implicit 'static'. Set
4377 DECL_THIS_STATIC so we can tell it from variables that are
4378 !TREE_PUBLIC because of the anonymous namespace. */
4379 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4380 DECL_THIS_STATIC (decl) = 1;
4383 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4384 start_decl_1 (decl, initialized);
4389 /* Process the declaration of a variable DECL. INITIALIZED is true
4390 iff DECL is explicitly initialized. (INITIALIZED is false if the
4391 variable is initialized via an implicitly-called constructor.)
4392 This function must be called for ordinary variables (including, for
4393 example, implicit instantiations of templates), but must not be
4394 called for template declarations. */
4397 start_decl_1 (tree decl, bool initialized)
4401 bool aggregate_definition_p;
4403 gcc_assert (!processing_template_decl);
4405 if (error_operand_p (decl))
4408 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4410 type = TREE_TYPE (decl);
4411 complete_p = COMPLETE_TYPE_P (type);
4412 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4414 /* If an explicit initializer is present, or if this is a definition
4415 of an aggregate, then we need a complete type at this point.
4416 (Scalars are always complete types, so there is nothing to
4417 check.) This code just sets COMPLETE_P; errors (if necessary)
4418 are issued below. */
4419 if ((initialized || aggregate_definition_p)
4421 && COMPLETE_TYPE_P (complete_type (type)))
4424 /* We will not yet have set TREE_READONLY on DECL if the type
4425 was "const", but incomplete, before this point. But, now, we
4426 have a complete type, so we can try again. */
4427 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4431 /* Is it valid for this decl to have an initializer at all? */
4433 /* Don't allow initializations for incomplete types except for
4434 arrays which might be completed by the initialization. */
4436 ; /* A complete type is ok. */
4437 else if (type_uses_auto (type))
4438 ; /* An auto type is ok. */
4439 else if (TREE_CODE (type) != ARRAY_TYPE)
4441 error ("variable %q#D has initializer but incomplete type", decl);
4442 type = TREE_TYPE (decl) = error_mark_node;
4444 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4446 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4447 error ("elements of array %q#D have incomplete type", decl);
4448 /* else we already gave an error in start_decl. */
4451 else if (aggregate_definition_p && !complete_p)
4453 if (type_uses_auto (type))
4454 error ("declaration of %q#D has no initializer", decl);
4456 error ("aggregate %q#D has incomplete type and cannot be defined",
4458 /* Change the type so that assemble_variable will give
4459 DECL an rtl we can live with: (mem (const_int 0)). */
4460 type = TREE_TYPE (decl) = error_mark_node;
4463 /* Create a new scope to hold this declaration if necessary.
4464 Whether or not a new scope is necessary cannot be determined
4465 until after the type has been completed; if the type is a
4466 specialization of a class template it is not until after
4467 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4468 will be set correctly. */
4469 maybe_push_cleanup_level (type);
4472 /* Handle initialization of references. DECL, TYPE, and INIT have the
4473 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4474 but will be set to a new CLEANUP_STMT if a temporary is created
4475 that must be destroyed subsequently.
4477 Returns an initializer expression to use to initialize DECL, or
4478 NULL if the initialization can be performed statically.
4480 Quotes on semantics can be found in ARM 8.4.3. */
4483 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4487 if (init == NULL_TREE)
4489 if ((DECL_LANG_SPECIFIC (decl) == 0
4490 || DECL_IN_AGGR_P (decl) == 0)
4491 && ! DECL_THIS_EXTERN (decl))
4492 error ("%qD declared as reference but not initialized", decl);
4496 if (TREE_CODE (init) == TREE_LIST)
4497 init = build_x_compound_expr_from_list (init, ELK_INIT,
4498 tf_warning_or_error);
4500 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4501 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4502 /* Note: default conversion is only called in very special cases. */
4503 init = decay_conversion (init);
4505 /* Convert INIT to the reference type TYPE. This may involve the
4506 creation of a temporary, whose lifetime must be the same as that
4507 of the reference. If so, a DECL_EXPR for the temporary will be
4508 added just after the DECL_EXPR for DECL. That's why we don't set
4509 DECL_INITIAL for local references (instead assigning to them
4510 explicitly); we need to allow the temporary to be initialized
4512 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4514 if (tmp == error_mark_node)
4516 else if (tmp == NULL_TREE)
4518 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4522 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4525 DECL_INITIAL (decl) = tmp;
4530 /* Subroutine of check_initializer. We're initializing a DECL of
4531 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4532 extend the lifetime of the underlying array to match that of the decl,
4533 just like for reference initialization. CLEANUP is as for
4534 grok_reference_init. */
4537 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4540 tree aggr_init, array, arrtype;
4541 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4542 if (error_operand_p (init))
4543 return error_mark_node;
4545 aggr_init = TARGET_EXPR_INITIAL (init);
4546 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4547 arrtype = TREE_TYPE (array);
4549 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4550 array = TREE_OPERAND (array, 0);
4551 /* If the array is constant, finish_compound_literal already made it a
4552 static variable and we don't need to do anything here. */
4553 if (decl && TREE_CODE (array) == TARGET_EXPR)
4555 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4556 var = build_address (var);
4557 var = convert (arrtype, var);
4558 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4563 /* Designated initializers in arrays are not supported in GNU C++.
4564 The parser cannot detect this error since it does not know whether
4565 a given brace-enclosed initializer is for a class type or for an
4566 array. This function checks that CE does not use a designated
4567 initializer. If it does, an error is issued. Returns true if CE
4568 is valid, i.e., does not have a designated initializer. */
4571 check_array_designated_initializer (const constructor_elt *ce)
4573 /* Designated initializers for array elements are not supported. */
4576 /* The parser only allows identifiers as designated
4578 if (ce->index == error_mark_node)
4579 error ("name used in a GNU-style designated "
4580 "initializer for an array");
4583 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4584 error ("name %qD used in a GNU-style designated "
4585 "initializer for an array", ce->index);
4593 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4594 array until we finish parsing the initializer. If that's the
4595 situation we're in, update DECL accordingly. */
4598 maybe_deduce_size_from_array_init (tree decl, tree init)
4600 tree type = TREE_TYPE (decl);
4602 if (TREE_CODE (type) == ARRAY_TYPE
4603 && TYPE_DOMAIN (type) == NULL_TREE
4604 && TREE_CODE (decl) != TYPE_DECL)
4606 /* do_default is really a C-ism to deal with tentative definitions.
4607 But let's leave it here to ease the eventual merge. */
4608 int do_default = !DECL_EXTERNAL (decl);
4609 tree initializer = init ? init : DECL_INITIAL (decl);
4612 /* Check that there are no designated initializers in INIT, as
4613 those are not supported in GNU C++, and as the middle-end
4614 will crash if presented with a non-numeric designated
4616 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4618 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4619 constructor_elt *ce;
4621 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4622 if (!check_array_designated_initializer (ce))
4628 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4632 error ("initializer fails to determine size of %qD", decl);
4633 TREE_TYPE (decl) = error_mark_node;
4635 else if (failure == 2)
4639 error ("array size missing in %qD", decl);
4640 TREE_TYPE (decl) = error_mark_node;
4642 /* If a `static' var's size isn't known, make it extern as
4643 well as static, so it does not get allocated. If it's not
4644 `static', then don't mark it extern; finish_incomplete_decl
4645 will give it a default size and it will get allocated. */
4646 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4647 DECL_EXTERNAL (decl) = 1;
4649 else if (failure == 3)
4651 error ("zero-size array %qD", decl);
4652 TREE_TYPE (decl) = error_mark_node;
4656 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4658 relayout_decl (decl);
4662 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4663 any appropriate error messages regarding the layout. */
4666 layout_var_decl (tree decl)
4670 type = TREE_TYPE (decl);
4671 if (type == error_mark_node)
4674 /* If we haven't already layed out this declaration, do so now.
4675 Note that we must not call complete type for an external object
4676 because it's type might involve templates that we are not
4677 supposed to instantiate yet. (And it's perfectly valid to say
4678 `extern X x' for some incomplete type `X'.) */
4679 if (!DECL_EXTERNAL (decl))
4680 complete_type (type);
4681 if (!DECL_SIZE (decl)
4682 && TREE_TYPE (decl) != error_mark_node
4683 && (COMPLETE_TYPE_P (type)
4684 || (TREE_CODE (type) == ARRAY_TYPE
4685 && !TYPE_DOMAIN (type)
4686 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4687 layout_decl (decl, 0);
4689 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4691 /* An automatic variable with an incomplete type: that is an error.
4692 Don't talk about array types here, since we took care of that
4693 message in grokdeclarator. */
4694 error ("storage size of %qD isn%'t known", decl);
4695 TREE_TYPE (decl) = error_mark_node;
4698 /* Keep this code around in case we later want to control debug info
4699 based on whether a type is "used". (jason 1999-11-11) */
4701 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4702 /* Let debugger know it should output info for this type. */
4703 note_debug_info_needed (ttype);
4705 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4706 note_debug_info_needed (DECL_CONTEXT (decl));
4709 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4710 && DECL_SIZE (decl) != NULL_TREE
4711 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4713 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4714 constant_expression_warning (DECL_SIZE (decl));
4717 error ("storage size of %qD isn%'t constant", decl);
4718 TREE_TYPE (decl) = error_mark_node;
4723 /* If a local static variable is declared in an inline function, or if
4724 we have a weak definition, we must endeavor to create only one
4725 instance of the variable at link-time. */
4728 maybe_commonize_var (tree decl)
4730 /* Static data in a function with comdat linkage also has comdat
4732 if (TREE_STATIC (decl)
4733 /* Don't mess with __FUNCTION__. */
4734 && ! DECL_ARTIFICIAL (decl)
4735 && DECL_FUNCTION_SCOPE_P (decl)
4736 && vague_linkage_p (DECL_CONTEXT (decl)))
4740 /* With weak symbols, we simply make the variable COMDAT;
4741 that will cause copies in multiple translations units to
4743 comdat_linkage (decl);
4747 if (DECL_INITIAL (decl) == NULL_TREE
4748 || DECL_INITIAL (decl) == error_mark_node)
4750 /* Without weak symbols, we can use COMMON to merge
4751 uninitialized variables. */
4752 TREE_PUBLIC (decl) = 1;
4753 DECL_COMMON (decl) = 1;
4757 /* While for initialized variables, we must use internal
4758 linkage -- which means that multiple copies will not
4760 TREE_PUBLIC (decl) = 0;
4761 DECL_COMMON (decl) = 0;
4762 warning_at (input_location, 0,
4763 "sorry: semantics of inline function static "
4764 "data %q+#D are wrong (you%'ll wind up "
4765 "with multiple copies)", decl);
4766 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4767 " you can work around this by removing "
4772 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4773 /* Set it up again; we might have set DECL_INITIAL since the last
4775 comdat_linkage (decl);
4778 /* Issue an error message if DECL is an uninitialized const variable. */
4781 check_for_uninitialized_const_var (tree decl)
4783 tree type = strip_array_types (TREE_TYPE (decl));
4785 /* ``Unless explicitly declared extern, a const object does not have
4786 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4788 if (TREE_CODE (decl) == VAR_DECL
4789 && TREE_CODE (type) != REFERENCE_TYPE
4790 && CP_TYPE_CONST_P (type)
4791 && (!TYPE_NEEDS_CONSTRUCTING (type)
4792 || !type_has_user_provided_default_constructor (type))
4793 && !DECL_INITIAL (decl))
4795 permerror (DECL_SOURCE_LOCATION (decl),
4796 "uninitialized const %qD", decl);
4798 if (CLASS_TYPE_P (type)
4799 && !type_has_user_provided_default_constructor (type))
4801 tree defaulted_ctor;
4803 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4804 "%q#T has no user-provided default constructor", type);
4805 defaulted_ctor = in_class_defaulted_default_constructor (type);
4807 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4808 "constructor is not user-provided because it is "
4809 "explicitly defaulted in the class body");
4814 /* Structure holding the current initializer being processed by reshape_init.
4815 CUR is a pointer to the current element being processed, END is a pointer
4816 after the last element present in the initializer. */
4817 typedef struct reshape_iterator_t
4819 constructor_elt *cur;
4820 constructor_elt *end;
4823 static tree reshape_init_r (tree, reshape_iter *, bool);
4825 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4826 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4827 initialized. If there are no more such fields, the return value
4831 next_initializable_field (tree field)
4834 && (TREE_CODE (field) != FIELD_DECL
4835 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4836 || DECL_ARTIFICIAL (field)))
4837 field = DECL_CHAIN (field);
4842 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4843 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4844 INTEGER_CST representing the size of the array minus one (the maximum index),
4845 or NULL_TREE if the array was declared without specifying the size. D is
4846 the iterator within the constructor. */
4849 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4852 bool sized_array_p = (max_index != NULL_TREE);
4853 unsigned HOST_WIDE_INT max_index_cst = 0;
4854 unsigned HOST_WIDE_INT index;
4856 /* The initializer for an array is always a CONSTRUCTOR. */
4857 new_init = build_constructor (init_list_type_node, NULL);
4861 /* Minus 1 is used for zero sized arrays. */
4862 if (integer_all_onesp (max_index))
4865 if (host_integerp (max_index, 1))
4866 max_index_cst = tree_low_cst (max_index, 1);
4867 /* sizetype is sign extended, not zero extended. */
4869 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4873 /* Loop until there are no more initializers. */
4875 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4880 check_array_designated_initializer (d->cur);
4881 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4882 if (elt_init == error_mark_node)
4883 return error_mark_node;
4884 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4890 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4891 Parameters are the same of reshape_init_r. */
4894 reshape_init_array (tree type, reshape_iter *d)
4896 tree max_index = NULL_TREE;
4898 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4900 if (TYPE_DOMAIN (type))
4901 max_index = array_type_nelts (type);
4903 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4906 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4907 Parameters are the same of reshape_init_r. */
4910 reshape_init_vector (tree type, reshape_iter *d)
4912 tree max_index = NULL_TREE;
4914 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4916 if (COMPOUND_LITERAL_P (d->cur->value))
4918 tree value = d->cur->value;
4919 if (!same_type_p (TREE_TYPE (value), type))
4921 error ("invalid type %qT as initializer for a vector of type %qT",
4922 TREE_TYPE (d->cur->value), type);
4923 value = error_mark_node;
4929 /* For a vector, we initialize it as an array of the appropriate size. */
4930 if (TREE_CODE (type) == VECTOR_TYPE)
4931 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4933 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4936 /* Subroutine of reshape_init_r, processes the initializers for classes
4937 or union. Parameters are the same of reshape_init_r. */
4940 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4945 gcc_assert (CLASS_TYPE_P (type));
4947 /* The initializer for a class is always a CONSTRUCTOR. */
4948 new_init = build_constructor (init_list_type_node, NULL);
4949 field = next_initializable_field (TYPE_FIELDS (type));
4955 An initializer for an aggregate member that is an
4956 empty class shall have the form of an empty
4957 initializer-list {}. */
4958 if (!first_initializer_p)
4960 error ("initializer for %qT must be brace-enclosed", type);
4961 return error_mark_node;
4966 /* Loop through the initializable fields, gathering initializers. */
4967 while (d->cur != d->end)
4971 /* Handle designated initializers, as an extension. */
4974 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4976 if (!field || TREE_CODE (field) != FIELD_DECL)
4978 error ("%qT has no non-static data member named %qD", type,
4980 return error_mark_node;
4984 /* If we processed all the member of the class, we are done. */
4988 field_init = reshape_init_r (TREE_TYPE (field), d,
4989 /*first_initializer_p=*/false);
4990 if (field_init == error_mark_node)
4991 return error_mark_node;
4993 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4997 When a union is initialized with a brace-enclosed
4998 initializer, the braces shall only contain an
4999 initializer for the first member of the union. */
5000 if (TREE_CODE (type) == UNION_TYPE)
5003 field = next_initializable_field (DECL_CHAIN (field));
5009 /* Subroutine of reshape_init, which processes a single initializer (part of
5010 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5011 iterator within the CONSTRUCTOR which points to the initializer to process.
5012 FIRST_INITIALIZER_P is true if this is the first initializer of the
5013 outermost CONSTRUCTOR node. */
5016 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5018 tree init = d->cur->value;
5020 if (error_operand_p (init))
5021 return error_mark_node;
5023 /* A non-aggregate type is always initialized with a single
5025 if (!CP_AGGREGATE_TYPE_P (type))
5027 /* It is invalid to initialize a non-aggregate type with a
5028 brace-enclosed initializer before C++0x.
5029 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5030 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5031 a CONSTRUCTOR (with a record type). */
5032 if (TREE_CODE (init) == CONSTRUCTOR
5033 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5035 if (SCALAR_TYPE_P (type))
5037 error ("braces around scalar initializer for type %qT", type);
5038 init = error_mark_node;
5041 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5050 All implicit type conversions (clause _conv_) are considered when
5051 initializing the aggregate member with an initializer from an
5052 initializer-list. If the initializer can initialize a member,
5053 the member is initialized. Otherwise, if the member is itself a
5054 non-empty subaggregate, brace elision is assumed and the
5055 initializer is considered for the initialization of the first
5056 member of the subaggregate. */
5057 if (TREE_CODE (init) != CONSTRUCTOR
5058 /* But don't try this for the first initializer, since that would be
5059 looking through the outermost braces; A a2 = { a1 }; is not a
5060 valid aggregate initialization. */
5061 && !first_initializer_p
5062 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5063 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5069 /* [dcl.init.string]
5071 A char array (whether plain char, signed char, or unsigned char)
5072 can be initialized by a string-literal (optionally enclosed in
5073 braces); a wchar_t array can be initialized by a wide
5074 string-literal (optionally enclosed in braces). */
5075 if (TREE_CODE (type) == ARRAY_TYPE
5076 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5078 tree str_init = init;
5080 /* Strip one level of braces if and only if they enclose a single
5081 element (as allowed by [dcl.init.string]). */
5082 if (!first_initializer_p
5083 && TREE_CODE (str_init) == CONSTRUCTOR
5084 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5086 str_init = VEC_index (constructor_elt,
5087 CONSTRUCTOR_ELTS (str_init), 0)->value;
5090 /* If it's a string literal, then it's the initializer for the array
5091 as a whole. Otherwise, continue with normal initialization for
5092 array types (one value per array element). */
5093 if (TREE_CODE (str_init) == STRING_CST)
5100 /* The following cases are about aggregates. If we are not within a full
5101 initializer already, and there is not a CONSTRUCTOR, it means that there
5102 is a missing set of braces (that is, we are processing the case for
5103 which reshape_init exists). */
5104 if (!first_initializer_p)
5106 if (TREE_CODE (init) == CONSTRUCTOR)
5108 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5109 /* There is no need to reshape pointer-to-member function
5110 initializers, as they are always constructed correctly
5111 by the front end. */
5113 else if (COMPOUND_LITERAL_P (init))
5114 /* For a nested compound literal, there is no need to reshape since
5115 brace elision is not allowed. Even if we decided to allow it,
5116 we should add a call to reshape_init in finish_compound_literal,
5117 before calling digest_init, so changing this code would still
5118 not be necessary. */
5119 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5123 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5124 return reshape_init (type, init);
5128 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5132 /* Dispatch to specialized routines. */
5133 if (CLASS_TYPE_P (type))
5134 return reshape_init_class (type, d, first_initializer_p);
5135 else if (TREE_CODE (type) == ARRAY_TYPE)
5136 return reshape_init_array (type, d);
5137 else if (TREE_CODE (type) == VECTOR_TYPE)
5138 return reshape_init_vector (type, d);
5143 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5144 brace-enclosed aggregate initializer.
5146 INIT is the CONSTRUCTOR containing the list of initializers describing
5147 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5148 It may not presently match the shape of the TYPE; for example:
5150 struct S { int a; int b; };
5151 struct S a[] = { 1, 2, 3, 4 };
5153 Here INIT will hold a VEC of four elements, rather than a
5154 VEC of two elements, each itself a VEC of two elements. This
5155 routine transforms INIT from the former form into the latter. The
5156 revised CONSTRUCTOR node is returned. */
5159 reshape_init (tree type, tree init)
5161 VEC(constructor_elt, gc) *v;
5165 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5167 v = CONSTRUCTOR_ELTS (init);
5169 /* An empty constructor does not need reshaping, and it is always a valid
5171 if (VEC_empty (constructor_elt, v))
5174 /* Recurse on this CONSTRUCTOR. */
5175 d.cur = VEC_index (constructor_elt, v, 0);
5176 d.end = d.cur + VEC_length (constructor_elt, v);
5178 new_init = reshape_init_r (type, &d, true);
5179 if (new_init == error_mark_node)
5180 return error_mark_node;
5182 /* Make sure all the element of the constructor were used. Otherwise,
5183 issue an error about exceeding initializers. */
5185 error ("too many initializers for %qT", type);
5190 /* Verify array initializer. Returns true if errors have been reported. */
5193 check_array_initializer (tree decl, tree type, tree init)
5195 tree element_type = TREE_TYPE (type);
5197 /* The array type itself need not be complete, because the
5198 initializer may tell us how many elements are in the array.
5199 But, the elements of the array must be complete. */
5200 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5203 error ("elements of array %q#D have incomplete type", decl);
5205 error ("elements of array %q#T have incomplete type", type);
5208 /* It is not valid to initialize a VLA. */
5210 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5211 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5214 error ("variable-sized object %qD may not be initialized", decl);
5216 error ("variable-sized compound literal");
5222 /* Subroutine of check_initializer; args are passed down from that function.
5223 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5226 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5229 int saved_stmts_are_full_exprs_p = 0;
5230 if (building_stmt_tree ())
5232 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5233 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5235 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5236 if (building_stmt_tree ())
5237 current_stmt_tree ()->stmts_are_full_exprs_p =
5238 saved_stmts_are_full_exprs_p;
5242 /* Verify INIT (the initializer for DECL), and record the
5243 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5244 grok_reference_init.
5246 If the return value is non-NULL, it is an expression that must be
5247 evaluated dynamically to initialize DECL. */
5250 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5252 tree type = TREE_TYPE (decl);
5253 tree init_code = NULL;
5254 tree extra_init = NULL_TREE;
5257 /* Things that are going to be initialized need to have complete
5259 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5261 if (type == error_mark_node)
5262 /* We will have already complained. */
5265 if (TREE_CODE (type) == ARRAY_TYPE)
5267 if (check_array_initializer (decl, type, init))
5270 else if (!COMPLETE_TYPE_P (type))
5272 error ("%qD has incomplete type", decl);
5273 TREE_TYPE (decl) = error_mark_node;
5277 /* There is no way to make a variable-sized class type in GNU C++. */
5278 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5280 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5282 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5283 if (SCALAR_TYPE_P (type))
5287 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5288 init = build_zero_init (type, NULL_TREE, false);
5290 else if (init_len != 1)
5292 error ("scalar object %qD requires one element in initializer",
5294 TREE_TYPE (decl) = error_mark_node;
5300 if (TREE_CODE (decl) == CONST_DECL)
5302 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5304 DECL_INITIAL (decl) = init;
5306 gcc_assert (init != NULL_TREE);
5309 else if (!init && DECL_REALLY_EXTERN (decl))
5311 else if (TREE_CODE (type) == REFERENCE_TYPE)
5312 init = grok_reference_init (decl, type, init, cleanup);
5313 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5316 check_for_uninitialized_const_var (decl);
5317 /* Do not reshape constructors of vectors (they don't need to be
5319 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5321 if (is_std_init_list (type))
5322 init = build_init_list_var_init (decl, type, init,
5323 &extra_init, cleanup);
5324 else if (TYPE_NON_AGGREGATE_CLASS (type))
5326 /* Don't reshape if the class has constructors. */
5327 if (cxx_dialect == cxx98)
5328 error ("in C++98 %qD must be initialized by constructor, "
5332 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5334 error ("opaque vector types cannot be initialized");
5335 init = error_mark_node;
5338 init = reshape_init (type, init);
5341 /* If DECL has an array type without a specific bound, deduce the
5342 array size from the initializer. */
5343 maybe_deduce_size_from_array_init (decl, init);
5344 type = TREE_TYPE (decl);
5345 if (type == error_mark_node)
5348 if (TYPE_NEEDS_CONSTRUCTING (type)
5349 || (CLASS_TYPE_P (type)
5350 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5352 init_code = build_aggr_init_full_exprs (decl, init, flags);
5354 /* If this is a constexpr initializer, expand_default_init will
5355 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5356 case, pull the initializer back out and pass it down into
5357 store_init_value. */
5358 while (TREE_CODE (init_code) == EXPR_STMT
5359 || TREE_CODE (init_code) == CONVERT_EXPR)
5360 init_code = TREE_OPERAND (init_code, 0);
5361 if (TREE_CODE (init_code) == INIT_EXPR)
5363 init = TREE_OPERAND (init_code, 1);
5364 init_code = NULL_TREE;
5365 /* Don't call digest_init; it's unnecessary and will complain
5366 about aggregate initialization of non-aggregate classes. */
5367 flags |= LOOKUP_ALREADY_DIGESTED;
5369 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5371 /* Declared constexpr, but no suitable initializer; massage
5372 init appropriately so we can pass it into store_init_value
5374 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5375 init = finish_compound_literal (type, init);
5376 else if (CLASS_TYPE_P (type)
5377 && (!init || TREE_CODE (init) == TREE_LIST))
5379 init = build_functional_cast (type, init, tf_none);
5380 if (init != error_mark_node)
5381 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5383 init_code = NULL_TREE;
5389 if (init && TREE_CODE (init) != TREE_VEC)
5391 init_code = store_init_value (decl, init, flags);
5392 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5393 && DECL_INITIAL (decl)
5394 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5395 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5396 warning (0, "array %qD initialized by parenthesized string literal %qE",
5397 decl, DECL_INITIAL (decl));
5403 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5404 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5405 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5406 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5409 check_for_uninitialized_const_var (decl);
5412 if (init && init != error_mark_node)
5413 init_code = build2 (INIT_EXPR, type, decl, init);
5416 init_code = add_stmt_to_compound (extra_init, init_code);
5418 if (init_code && DECL_IN_AGGR_P (decl))
5420 static int explained = 0;
5422 if (cxx_dialect < cxx0x)
5423 error ("initializer invalid for static member with constructor");
5425 error ("non-constant in-class initialization invalid for static "
5426 "member %qD", decl);
5429 error ("(an out of class initialization is required)");
5437 /* If DECL is not a local variable, give it RTL. */
5440 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5442 int toplev = toplevel_bindings_p ();
5444 const char *filename;
5446 /* Set the DECL_ASSEMBLER_NAME for the object. */
5449 /* The `register' keyword, when used together with an
5450 asm-specification, indicates that the variable should be
5451 placed in a particular register. */
5452 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5454 set_user_assembler_name (decl, asmspec);
5455 DECL_HARD_REGISTER (decl) = 1;
5459 if (TREE_CODE (decl) == FUNCTION_DECL
5460 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5461 set_builtin_user_assembler_name (decl, asmspec);
5462 set_user_assembler_name (decl, asmspec);
5466 /* Handle non-variables up front. */
5467 if (TREE_CODE (decl) != VAR_DECL)
5469 rest_of_decl_compilation (decl, toplev, at_eof);
5473 /* If we see a class member here, it should be a static data
5475 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5477 gcc_assert (TREE_STATIC (decl));
5478 /* An in-class declaration of a static data member should be
5479 external; it is only a declaration, and not a definition. */
5480 if (init == NULL_TREE)
5481 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5484 /* We don't create any RTL for local variables. */
5485 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5488 /* We defer emission of local statics until the corresponding
5489 DECL_EXPR is expanded. */
5490 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5492 /* We try to defer namespace-scope static constants so that they are
5493 not emitted into the object file unnecessarily. */
5494 filename = input_filename;
5495 if (!DECL_VIRTUAL_P (decl)
5496 && TREE_READONLY (decl)
5497 && DECL_INITIAL (decl) != NULL_TREE
5498 && DECL_INITIAL (decl) != error_mark_node
5500 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5502 && !TREE_PUBLIC (decl))
5504 /* Fool with the linkage of static consts according to #pragma
5506 struct c_fileinfo *finfo = get_fileinfo (filename);
5507 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5509 TREE_PUBLIC (decl) = 1;
5510 DECL_EXTERNAL (decl) = finfo->interface_only;
5515 /* Likewise for template instantiations. */
5516 else if (DECL_LANG_SPECIFIC (decl)
5517 && DECL_IMPLICIT_INSTANTIATION (decl))
5520 /* If we're not deferring, go ahead and assemble the variable. */
5522 rest_of_decl_compilation (decl, toplev, at_eof);
5525 /* walk_tree helper for wrap_temporary_cleanups, below. */
5528 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5530 if (TYPE_P (*stmt_p))
5536 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5538 tree guard = (tree)data;
5539 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5541 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5542 /* Tell honor_protect_cleanup_actions to handle this as a separate
5544 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5546 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5552 /* We're initializing a local variable which has a cleanup GUARD. If there
5553 are any temporaries used in the initializer INIT of this variable, we
5554 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5555 variable will be cleaned up properly if one of them throws.
5557 Unfortunately, there's no way to express this properly in terms of
5558 nesting, as the regions for the temporaries overlap the region for the
5559 variable itself; if there are two temporaries, the variable needs to be
5560 the first thing destroyed if either of them throws. However, we only
5561 want to run the variable's cleanup if it actually got constructed. So
5562 we need to guard the temporary cleanups with the variable's cleanup if
5563 they are run on the normal path, but not if they are run on the
5564 exceptional path. We implement this by telling
5565 honor_protect_cleanup_actions to strip the variable cleanup from the
5566 exceptional path. */
5569 wrap_temporary_cleanups (tree init, tree guard)
5571 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5574 /* Generate code to initialize DECL (a local variable). */
5577 initialize_local_var (tree decl, tree init)
5579 tree type = TREE_TYPE (decl);
5583 gcc_assert (TREE_CODE (decl) == VAR_DECL
5584 || TREE_CODE (decl) == RESULT_DECL);
5585 gcc_assert (!TREE_STATIC (decl));
5587 if (DECL_SIZE (decl) == NULL_TREE)
5589 /* If we used it already as memory, it must stay in memory. */
5590 DECL_INITIAL (decl) = NULL_TREE;
5591 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5595 if (type == error_mark_node)
5598 /* Compute and store the initial value. */
5599 already_used = TREE_USED (decl) || TREE_USED (type);
5600 if (TREE_USED (type))
5601 DECL_READ_P (decl) = 1;
5603 /* Generate a cleanup, if necessary. */
5604 cleanup = cxx_maybe_build_cleanup (decl);
5606 /* Perform the initialization. */
5609 int saved_stmts_are_full_exprs_p;
5611 /* If we're only initializing a single object, guard the destructors
5612 of any temporaries used in its initializer with its destructor.
5613 This isn't right for arrays because each element initialization is
5614 a full-expression. */
5615 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5616 wrap_temporary_cleanups (init, cleanup);
5618 gcc_assert (building_stmt_tree ());
5619 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5620 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5621 finish_expr_stmt (init);
5622 current_stmt_tree ()->stmts_are_full_exprs_p =
5623 saved_stmts_are_full_exprs_p;
5626 /* Set this to 0 so we can tell whether an aggregate which was
5627 initialized was ever used. Don't do this if it has a
5628 destructor, so we don't complain about the 'resource
5629 allocation is initialization' idiom. Now set
5630 attribute((unused)) on types so decls of that type will be
5631 marked used. (see TREE_USED, above.) */
5632 if (TYPE_NEEDS_CONSTRUCTING (type)
5634 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5635 && DECL_NAME (decl))
5636 TREE_USED (decl) = 0;
5637 else if (already_used)
5638 TREE_USED (decl) = 1;
5641 finish_decl_cleanup (decl, cleanup);
5644 /* DECL is a VAR_DECL for a compiler-generated variable with static
5645 storage duration (like a virtual table) whose initializer is a
5646 compile-time constant. Initialize the variable and provide it to the
5650 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5653 gcc_assert (DECL_ARTIFICIAL (decl));
5654 init = build_constructor (TREE_TYPE (decl), v);
5655 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5656 DECL_INITIAL (decl) = init;
5657 DECL_INITIALIZED_P (decl) = 1;
5658 determine_visibility (decl);
5659 layout_var_decl (decl);
5660 maybe_commonize_var (decl);
5661 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5664 /* INIT is the initializer for a variable, as represented by the
5665 parser. Returns true iff INIT is value-dependent. */
5668 value_dependent_init_p (tree init)
5670 if (TREE_CODE (init) == TREE_LIST)
5671 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5672 return any_value_dependent_elements_p (init);
5673 else if (TREE_CODE (init) == CONSTRUCTOR)
5674 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5676 VEC(constructor_elt, gc) *elts;
5680 elts = CONSTRUCTOR_ELTS (init);
5681 nelts = VEC_length (constructor_elt, elts);
5682 for (i = 0; i < nelts; ++i)
5683 if (value_dependent_init_p (VEC_index (constructor_elt,
5688 /* It must be a simple expression, e.g., int i = 3; */
5689 return value_dependent_expression_p (init);
5694 /* Finish processing of a declaration;
5695 install its line number and initial value.
5696 If the length of an array type is not known before,
5697 it must be determined now, from the initial value, or it is an error.
5699 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5700 true, then INIT is an integral constant expression.
5702 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5703 if the (init) syntax was used. */
5706 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5707 tree asmspec_tree, int flags)
5711 const char *asmspec = NULL;
5712 int was_readonly = 0;
5713 bool var_definition_p = false;
5714 int saved_processing_template_decl;
5717 if (decl == error_mark_node)
5722 error ("assignment (not initialization) in declaration");
5726 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5727 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5728 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5730 type = TREE_TYPE (decl);
5731 if (type == error_mark_node)
5734 /* Assume no cleanup is required. */
5735 cleanup = NULL_TREE;
5736 saved_processing_template_decl = processing_template_decl;
5738 /* If a name was specified, get the string. */
5739 if (global_scope_p (current_binding_level))
5740 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5741 if (asmspec_tree && asmspec_tree != error_mark_node)
5742 asmspec = TREE_STRING_POINTER (asmspec_tree);
5744 if (current_class_type
5745 && CP_DECL_CONTEXT (decl) == current_class_type
5746 && TYPE_BEING_DEFINED (current_class_type)
5747 && (DECL_INITIAL (decl) || init))
5748 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5750 auto_node = type_uses_auto (type);
5754 if (init == NULL_TREE)
5756 error ("declaration of %q#D has no initializer", decl);
5757 TREE_TYPE (decl) = error_mark_node;
5761 if (TREE_CODE (d_init) == TREE_LIST)
5762 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5763 tf_warning_or_error);
5764 if (describable_type (d_init))
5766 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5768 if (type == error_mark_node)
5773 if (TREE_CODE (decl) == FUNCTION_DECL)
5774 validate_constexpr_fundecl (decl);
5776 else if (!ensure_literal_type_for_constexpr_object (decl))
5777 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5779 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5782 if (init == ridpointers[(int)RID_DELETE])
5784 /* FIXME check this is 1st decl. */
5785 DECL_DELETED_FN (decl) = 1;
5786 DECL_DECLARED_INLINE_P (decl) = 1;
5787 DECL_INITIAL (decl) = error_mark_node;
5788 FOR_EACH_CLONE (clone, decl)
5790 DECL_DELETED_FN (clone) = 1;
5791 DECL_DECLARED_INLINE_P (clone) = 1;
5792 DECL_INITIAL (clone) = error_mark_node;
5796 else if (init == ridpointers[(int)RID_DEFAULT])
5798 if (defaultable_fn_check (decl))
5799 DECL_DEFAULTED_FN (decl) = 1;
5801 DECL_INITIAL (decl) = NULL_TREE;
5805 if (init && TREE_CODE (decl) == VAR_DECL)
5807 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5808 /* FIXME we rely on TREE_CONSTANT below; basing that on
5809 init_const_expr_p is probably wrong for C++0x. */
5810 if (init_const_expr_p)
5812 /* Set these flags now for C++98 templates. We'll update the
5813 flags in store_init_value for instantiations and C++0x. */
5814 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5815 if (decl_maybe_constant_var_p (decl))
5816 TREE_CONSTANT (decl) = 1;
5820 if (processing_template_decl)
5822 bool type_dependent_p;
5824 /* Add this declaration to the statement-tree. */
5825 if (at_function_scope_p ())
5826 add_decl_expr (decl);
5828 type_dependent_p = dependent_type_p (type);
5830 if (check_for_bare_parameter_packs (init))
5833 DECL_INITIAL (decl) = NULL_TREE;
5836 /* Generally, initializers in templates are expanded when the
5837 template is instantiated. But, if DECL is a variable constant
5838 then it can be used in future constant expressions, so its value
5839 must be available. */
5841 && DECL_CLASS_SCOPE_P (decl)
5842 /* We just set TREE_CONSTANT appropriately; see above. */
5843 && TREE_CONSTANT (decl)
5844 && !type_dependent_p
5845 /* FIXME non-value-dependent constant expression */
5846 && !value_dependent_init_p (init)))
5849 DECL_INITIAL (decl) = init;
5850 if (TREE_CODE (decl) == VAR_DECL
5851 && !DECL_PRETTY_FUNCTION_P (decl)
5852 && !type_dependent_p)
5853 maybe_deduce_size_from_array_init (decl, init);
5857 if (TREE_CODE (init) == TREE_LIST)
5859 /* If the parenthesized-initializer form was used (e.g.,
5860 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5861 arguments. (There is generally only one.) We convert them
5864 for (; list; list = TREE_CHAIN (list))
5866 tree elt = TREE_VALUE (list);
5867 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5871 init = fold_non_dependent_expr (init);
5872 processing_template_decl = 0;
5875 /* Take care of TYPE_DECLs up front. */
5876 if (TREE_CODE (decl) == TYPE_DECL)
5878 if (type != error_mark_node
5879 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5881 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5882 warning (0, "shadowing previous type declaration of %q#D", decl);
5883 set_identifier_type_value (DECL_NAME (decl), decl);
5886 /* If we have installed this as the canonical typedef for this
5887 type, and that type has not been defined yet, delay emitting
5888 the debug information for it, as we will emit it later. */
5889 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5890 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5891 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5893 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5898 /* A reference will be modified here, as it is initialized. */
5899 if (! DECL_EXTERNAL (decl)
5900 && TREE_READONLY (decl)
5901 && TREE_CODE (type) == REFERENCE_TYPE)
5904 TREE_READONLY (decl) = 0;
5907 if (TREE_CODE (decl) == VAR_DECL)
5909 /* Only variables with trivial initialization and destruction can
5910 have thread-local storage. */
5911 if (DECL_THREAD_LOCAL_P (decl)
5912 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5913 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5914 error ("%qD cannot be thread-local because it has non-trivial "
5915 "type %qT", decl, TREE_TYPE (decl));
5916 /* If this is a local variable that will need a mangled name,
5917 register it now. We must do this before processing the
5918 initializer for the variable, since the initialization might
5919 require a guard variable, and since the mangled name of the
5920 guard variable will depend on the mangled name of this
5922 if (DECL_FUNCTION_SCOPE_P (decl)
5923 && TREE_STATIC (decl)
5924 && !DECL_ARTIFICIAL (decl))
5926 push_local_name (decl);
5927 if (DECL_CONSTRUCTOR_P (current_function_decl)
5928 || DECL_DESTRUCTOR_P (current_function_decl))
5929 /* Normally local_decls is populated during GIMPLE lowering,
5930 but [cd]tors are never actually compiled directly. We need
5931 to put statics on the list so we can deal with the label
5932 address extension. */
5933 add_local_decl (cfun, decl);
5936 /* Convert the initializer to the type of DECL, if we have not
5937 already initialized DECL. */
5938 if (!DECL_INITIALIZED_P (decl)
5939 /* If !DECL_EXTERNAL then DECL is being defined. In the
5940 case of a static data member initialized inside the
5941 class-specifier, there can be an initializer even if DECL
5942 is *not* defined. */
5943 && (!DECL_EXTERNAL (decl) || init))
5945 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5948 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5949 /* Allow libjava/prims.cc define primitive classes. */
5950 if (init != NULL_TREE
5951 || jclass == NULL_TREE
5952 || TREE_CODE (jclass) != TYPE_DECL
5953 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5954 || !same_type_ignoring_top_level_qualifiers_p
5955 (type, TREE_TYPE (TREE_TYPE (jclass))))
5956 error ("Java object %qD not allocated with %<new%>", decl);
5959 init = check_initializer (decl, init, flags, &cleanup);
5960 /* Thread-local storage cannot be dynamically initialized. */
5961 if (DECL_THREAD_LOCAL_P (decl) && init)
5963 error ("%qD is thread-local and so cannot be dynamically "
5964 "initialized", decl);
5968 /* Check that the initializer for a static data member was a
5969 constant. Although we check in the parser that the
5970 initializer is an integral constant expression, we do not
5971 simplify division-by-zero at the point at which it
5972 occurs. Therefore, in:
5974 struct S { static const int i = 7 / 0; };
5976 we issue an error at this point. It would
5977 probably be better to forbid division by zero in
5978 integral constant expressions. */
5979 if (DECL_EXTERNAL (decl) && init)
5981 error ("%qD cannot be initialized by a non-constant expression"
5982 " when being declared", decl);
5983 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5991 The memory occupied by any object of static storage
5992 duration is zero-initialized at program startup before
5993 any other initialization takes place.
5995 We cannot create an appropriate initializer until after
5996 the type of DECL is finalized. If DECL_INITIAL is set,
5997 then the DECL is statically initialized, and any
5998 necessary zero-initialization has already been performed. */
5999 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6000 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6001 /*nelts=*/NULL_TREE,
6002 /*static_storage_p=*/true);
6003 /* Remember that the initialization for this variable has
6005 DECL_INITIALIZED_P (decl) = 1;
6006 /* This declaration is the definition of this variable,
6007 unless we are initializing a static data member within
6008 the class specifier. */
6009 if (!DECL_EXTERNAL (decl))
6010 var_definition_p = true;
6012 /* If the variable has an array type, lay out the type, even if
6013 there is no initializer. It is valid to index through the
6014 array, and we must get TYPE_ALIGN set correctly on the array
6016 else if (TREE_CODE (type) == ARRAY_TYPE)
6019 if (!processing_template_decl
6020 && TREE_STATIC (decl)
6021 && !at_function_scope_p ()
6022 && current_function_decl == NULL)
6023 /* So decl is a global variable or a static member of a
6024 non local class. Record the types it uses
6025 so that we can decide later to emit debug info for them. */
6026 record_types_used_by_current_var_decl (decl);
6028 else if (TREE_CODE (decl) == FIELD_DECL
6029 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6030 error ("non-static data member %qD has Java class type", decl);
6032 /* Add this declaration to the statement-tree. This needs to happen
6033 after the call to check_initializer so that the DECL_EXPR for a
6034 reference temp is added before the DECL_EXPR for the reference itself. */
6035 if (at_function_scope_p ())
6036 add_decl_expr (decl);
6038 /* Let the middle end know about variables and functions -- but not
6039 static data members in uninstantiated class templates. */
6040 if (!saved_processing_template_decl
6041 && (TREE_CODE (decl) == VAR_DECL
6042 || TREE_CODE (decl) == FUNCTION_DECL))
6044 if (TREE_CODE (decl) == VAR_DECL)
6046 layout_var_decl (decl);
6047 maybe_commonize_var (decl);
6050 /* This needs to happen after the linkage is set. */
6051 determine_visibility (decl);
6053 if (var_definition_p && TREE_STATIC (decl))
6055 /* If a TREE_READONLY variable needs initialization
6056 at runtime, it is no longer readonly and we need to
6057 avoid MEM_READONLY_P being set on RTL created for it. */
6060 if (TREE_READONLY (decl))
6061 TREE_READONLY (decl) = 0;
6064 else if (was_readonly)
6065 TREE_READONLY (decl) = 1;
6068 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6070 /* Check for abstractness of the type. Notice that there is no
6071 need to strip array types here since the check for those types
6072 is already done within create_array_type_for_decl. */
6073 if (TREE_CODE (type) == FUNCTION_TYPE
6074 || TREE_CODE (type) == METHOD_TYPE)
6075 abstract_virtuals_error (decl, TREE_TYPE (type));
6077 abstract_virtuals_error (decl, type);
6079 if (TREE_TYPE (decl) == error_mark_node)
6080 /* No initialization required. */
6082 else if (TREE_CODE (decl) == FUNCTION_DECL)
6086 if (init == ridpointers[(int)RID_DEFAULT])
6088 /* An out-of-class default definition is defined at
6089 the point where it is explicitly defaulted. */
6090 if (DECL_INITIAL (decl) == error_mark_node)
6091 synthesize_method (decl);
6094 error ("function %q#D is initialized like a variable", decl);
6096 /* else no initialization required. */
6098 else if (DECL_EXTERNAL (decl)
6099 && ! (DECL_LANG_SPECIFIC (decl)
6100 && DECL_NOT_REALLY_EXTERN (decl)))
6103 DECL_INITIAL (decl) = init;
6105 /* A variable definition. */
6106 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6107 /* Initialize the local variable. */
6108 initialize_local_var (decl, init);
6110 /* If a variable is defined, and then a subsequent
6111 definition with external linkage is encountered, we will
6112 get here twice for the same variable. We want to avoid
6113 calling expand_static_init more than once. For variables
6114 that are not static data members, we can call
6115 expand_static_init only when we actually process the
6116 initializer. It is not legal to redeclare a static data
6117 member, so this issue does not arise in that case. */
6118 else if (var_definition_p && TREE_STATIC (decl))
6119 expand_static_init (decl, init);
6122 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6123 reference, insert it in the statement-tree now. */
6125 push_cleanup (decl, cleanup, false);
6128 processing_template_decl = saved_processing_template_decl;
6131 TREE_READONLY (decl) = 1;
6134 /* Returns a declaration for a VAR_DECL as if:
6136 extern "C" TYPE NAME;
6138 had been seen. Used to create compiler-generated global
6142 declare_global_var (tree name, tree type)
6146 push_to_top_level ();
6147 decl = build_decl (input_location, VAR_DECL, name, type);
6148 TREE_PUBLIC (decl) = 1;
6149 DECL_EXTERNAL (decl) = 1;
6150 DECL_ARTIFICIAL (decl) = 1;
6151 /* If the user has explicitly declared this variable (perhaps
6152 because the code we are compiling is part of a low-level runtime
6153 library), then it is possible that our declaration will be merged
6154 with theirs by pushdecl. */
6155 decl = pushdecl (decl);
6156 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6157 pop_from_top_level ();
6162 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6163 if "__cxa_atexit" is not being used) corresponding to the function
6164 to be called when the program exits. */
6167 get_atexit_fn_ptr_type (void)
6171 if (!atexit_fn_ptr_type_node)
6174 if (flag_use_cxa_atexit
6175 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6176 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6177 arg_type = ptr_type_node;
6179 /* The parameter to "atexit" is "void (*)(void)". */
6180 arg_type = NULL_TREE;
6182 fn_type = build_function_type_list (void_type_node,
6183 arg_type, NULL_TREE);
6184 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6187 return atexit_fn_ptr_type_node;
6190 /* Returns a pointer to the `atexit' function. Note that if
6191 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6192 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6195 get_atexit_node (void)
6201 bool use_aeabi_atexit;
6206 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6208 /* The declaration for `__cxa_atexit' is:
6210 int __cxa_atexit (void (*)(void *), void *, void *)
6212 We build up the argument types and then the function type
6214 tree argtype0, argtype1, argtype2;
6216 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6217 /* First, build the pointer-to-function type for the first
6219 fn_ptr_type = get_atexit_fn_ptr_type ();
6220 /* Then, build the rest of the argument types. */
6221 argtype2 = ptr_type_node;
6222 if (use_aeabi_atexit)
6224 argtype1 = fn_ptr_type;
6225 argtype0 = ptr_type_node;
6229 argtype1 = ptr_type_node;
6230 argtype0 = fn_ptr_type;
6232 /* And the final __cxa_atexit type. */
6233 fn_type = build_function_type_list (integer_type_node,
6234 argtype0, argtype1, argtype2,
6236 fn_ptr_type = build_pointer_type (fn_type);
6237 if (use_aeabi_atexit)
6238 name = "__aeabi_atexit";
6240 name = "__cxa_atexit";
6244 /* The declaration for `atexit' is:
6246 int atexit (void (*)());
6248 We build up the argument types and then the function type
6250 fn_ptr_type = get_atexit_fn_ptr_type ();
6251 /* Build the final atexit type. */
6252 fn_type = build_function_type_list (integer_type_node,
6253 fn_ptr_type, NULL_TREE);
6257 /* Now, build the function declaration. */
6258 push_lang_context (lang_name_c);
6259 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6260 mark_used (atexit_fndecl);
6261 pop_lang_context ();
6262 atexit_node = decay_conversion (atexit_fndecl);
6267 /* Returns the __dso_handle VAR_DECL. */
6270 get_dso_handle_node (void)
6272 if (dso_handle_node)
6273 return dso_handle_node;
6275 /* Declare the variable. */
6276 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6279 return dso_handle_node;
6282 /* Begin a new function with internal linkage whose job will be simply
6283 to destroy some particular variable. */
6285 static GTY(()) int start_cleanup_cnt;
6288 start_cleanup_fn (void)
6293 bool use_cxa_atexit = flag_use_cxa_atexit
6294 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6296 push_to_top_level ();
6298 /* No need to mangle this. */
6299 push_lang_context (lang_name_c);
6301 /* Build the name of the function. */
6302 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6303 /* Build the function declaration. */
6304 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6305 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6306 /* It's a function with internal linkage, generated by the
6308 TREE_PUBLIC (fndecl) = 0;
6309 DECL_ARTIFICIAL (fndecl) = 1;
6310 /* Make the function `inline' so that it is only emitted if it is
6311 actually needed. It is unlikely that it will be inlined, since
6312 it is only called via a function pointer, but we avoid unnecessary
6313 emissions this way. */
6314 DECL_DECLARED_INLINE_P (fndecl) = 1;
6315 DECL_INTERFACE_KNOWN (fndecl) = 1;
6316 /* Build the parameter. */
6321 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6322 DECL_CONTEXT (parmdecl) = fndecl;
6323 TREE_USED (parmdecl) = 1;
6324 DECL_READ_P (parmdecl) = 1;
6325 DECL_ARGUMENTS (fndecl) = parmdecl;
6329 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6331 pop_lang_context ();
6333 return current_function_decl;
6336 /* Finish the cleanup function begun by start_cleanup_fn. */
6339 end_cleanup_fn (void)
6341 expand_or_defer_fn (finish_function (0));
6343 pop_from_top_level ();
6346 /* Generate code to handle the destruction of DECL, an object with
6347 static storage duration. */
6350 register_dtor_fn (tree decl)
6357 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6359 type = TREE_TYPE (decl);
6360 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6361 return void_zero_node;
6363 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6364 a class object, we can just pass the destructor to
6365 "__cxa_atexit"; we don't have to build a temporary function to do
6367 use_dtor = (flag_use_cxa_atexit
6368 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6369 && CLASS_TYPE_P (type));
6374 /* Find the destructor. */
6375 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6376 gcc_assert (idx >= 0);
6377 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6378 /* Make sure it is accessible. */
6379 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6383 /* Call build_cleanup before we enter the anonymous function so
6384 that any access checks will be done relative to the current
6385 scope, rather than the scope of the anonymous function. */
6386 build_cleanup (decl);
6388 /* Now start the function. */
6389 cleanup = start_cleanup_fn ();
6391 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6392 to the original function, rather than the anonymous one. That
6393 will make the back end think that nested functions are in use,
6394 which causes confusion. */
6395 push_deferring_access_checks (dk_no_check);
6396 fcall = build_cleanup (decl);
6397 pop_deferring_access_checks ();
6399 /* Create the body of the anonymous function. */
6400 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6401 finish_expr_stmt (fcall);
6402 finish_compound_stmt (compound_stmt);
6406 /* Call atexit with the cleanup function. */
6407 mark_used (cleanup);
6408 cleanup = build_address (cleanup);
6409 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6415 /* We must convert CLEANUP to the type that "__cxa_atexit"
6417 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6418 /* "__cxa_atexit" will pass the address of DECL to the
6419 cleanup function. */
6421 addr = build_address (decl);
6422 /* The declared type of the parameter to "__cxa_atexit" is
6423 "void *". For plain "T*", we could just let the
6424 machinery in cp_build_function_call convert it -- but if the
6425 type is "cv-qualified T *", then we need to convert it
6426 before passing it in, to avoid spurious errors. */
6427 addr = build_nop (ptr_type_node, addr);
6430 /* Since the cleanup functions we build ignore the address
6431 they're given, there's no reason to pass the actual address
6432 in, and, in general, it's cheaper to pass NULL than any
6434 addr = null_pointer_node;
6435 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6436 tf_warning_or_error);
6437 if (targetm.cxx.use_aeabi_atexit ())
6450 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6451 arg0, arg1, arg2, NULL_TREE);
6454 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6455 is its initializer. Generate code to handle the construction
6456 and destruction of DECL. */
6459 expand_static_init (tree decl, tree init)
6461 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6462 gcc_assert (TREE_STATIC (decl));
6464 /* Some variables require no dynamic initialization. */
6466 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6469 if (DECL_FUNCTION_SCOPE_P (decl))
6471 /* Emit code to perform this initialization but once. */
6472 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6473 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6474 tree guard, guard_addr;
6475 tree acquire_fn, release_fn, abort_fn;
6478 /* Emit code to perform this initialization but once. This code
6481 static <type> guard;
6482 if (!guard.first_byte) {
6483 if (__cxa_guard_acquire (&guard)) {
6486 // Do initialization.
6487 flag = true; __cxa_guard_release (&guard);
6488 // Register variable for destruction at end of program.
6490 if (!flag) __cxa_guard_abort (&guard);
6494 Note that the `flag' variable is only set to 1 *after* the
6495 initialization is complete. This ensures that an exception,
6496 thrown during the construction, will cause the variable to
6497 reinitialized when we pass through this code again, as per:
6501 If the initialization exits by throwing an exception, the
6502 initialization is not complete, so it will be tried again
6503 the next time control enters the declaration.
6505 This process should be thread-safe, too; multiple threads
6506 should not be able to initialize the variable more than
6509 /* Create the guard variable. */
6510 guard = get_guard (decl);
6512 /* This optimization isn't safe on targets with relaxed memory
6513 consistency. On such targets we force synchronization in
6514 __cxa_guard_acquire. */
6515 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6517 /* Begin the conditional initialization. */
6518 if_stmt = begin_if_stmt ();
6519 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6520 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6523 if (flag_threadsafe_statics)
6525 guard_addr = build_address (guard);
6527 acquire_fn = get_identifier ("__cxa_guard_acquire");
6528 release_fn = get_identifier ("__cxa_guard_release");
6529 abort_fn = get_identifier ("__cxa_guard_abort");
6530 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6532 tree vfntype = build_function_type_list (void_type_node,
6533 TREE_TYPE (guard_addr),
6535 acquire_fn = push_library_fn
6536 (acquire_fn, build_function_type_list (integer_type_node,
6537 TREE_TYPE (guard_addr),
6540 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6541 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6545 release_fn = identifier_global_value (release_fn);
6546 abort_fn = identifier_global_value (abort_fn);
6549 inner_if_stmt = begin_if_stmt ();
6550 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6553 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6554 begin = get_target_expr (boolean_false_node);
6555 flag = TARGET_EXPR_SLOT (begin);
6557 TARGET_EXPR_CLEANUP (begin)
6558 = build3 (COND_EXPR, void_type_node, flag,
6560 build_call_n (abort_fn, 1, guard_addr));
6561 CLEANUP_EH_ONLY (begin) = 1;
6563 /* Do the initialization itself. */
6564 init = add_stmt_to_compound (begin, init);
6565 init = add_stmt_to_compound
6566 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6567 init = add_stmt_to_compound
6568 (init, build_call_n (release_fn, 1, guard_addr));
6571 init = add_stmt_to_compound (init, set_guard (guard));
6573 /* Use atexit to register a function for destroying this static
6575 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6577 finish_expr_stmt (init);
6579 if (flag_threadsafe_statics)
6581 finish_compound_stmt (inner_then_clause);
6582 finish_then_clause (inner_if_stmt);
6583 finish_if_stmt (inner_if_stmt);
6586 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6588 finish_compound_stmt (then_clause);
6589 finish_then_clause (if_stmt);
6590 finish_if_stmt (if_stmt);
6594 static_aggregates = tree_cons (init, decl, static_aggregates);
6598 /* Make TYPE a complete type based on INITIAL_VALUE.
6599 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6600 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6601 3 if the initializer list is empty (in pedantic mode). */
6604 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6607 tree type, elt_type;
6611 unsigned HOST_WIDE_INT i;
6614 /* An array of character type can be initialized from a
6615 brace-enclosed string constant.
6617 FIXME: this code is duplicated from reshape_init. Probably
6618 we should just call reshape_init here? */
6619 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6620 && TREE_CODE (initial_value) == CONSTRUCTOR
6621 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6623 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6624 tree value = VEC_index (constructor_elt, v, 0)->value;
6626 if (TREE_CODE (value) == STRING_CST
6627 && VEC_length (constructor_elt, v) == 1)
6628 initial_value = value;
6631 /* If any of the elements are parameter packs, we can't actually
6632 complete this type now because the array size is dependent. */
6633 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6635 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6638 if (PACK_EXPANSION_P (value))
6644 failure = complete_array_type (ptype, initial_value, do_default);
6646 /* We can create the array before the element type is complete, which
6647 means that we didn't have these two bits set in the original type
6648 either. In completing the type, we are expected to propagate these
6649 bits. See also complete_type which does the same thing for arrays
6652 if (TYPE_DOMAIN (type))
6654 elt_type = TREE_TYPE (type);
6655 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6656 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6657 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6663 /* Return zero if something is declared to be a member of type
6664 CTYPE when in the context of CUR_TYPE. STRING is the error
6665 message to print in that case. Otherwise, quietly return 1. */
6668 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6670 if (ctype && ctype != cur_type)
6672 if (flags == DTOR_FLAG)
6673 error ("destructor for alien class %qT cannot be a member", ctype);
6675 error ("constructor for alien class %qT cannot be a member", ctype);
6681 /* Subroutine of `grokdeclarator'. */
6683 /* Generate errors possibly applicable for a given set of specifiers.
6684 This is for ARM $7.1.2. */
6687 bad_specifiers (tree object,
6688 enum bad_spec_place type,
6699 error ("%qD declared as a %<virtual%> variable", object);
6701 error ("%qD declared as an %<inline%> variable", object);
6703 error ("%<const%> and %<volatile%> function specifiers on "
6704 "%qD invalid in variable declaration", object);
6708 error ("%qD declared as a %<virtual%> parameter", object);
6710 error ("%qD declared as an %<inline%> parameter", object);
6712 error ("%<const%> and %<volatile%> function specifiers on "
6713 "%qD invalid in parameter declaration", object);
6717 error ("%qD declared as a %<virtual%> type", object);
6719 error ("%qD declared as an %<inline%> type", object);
6721 error ("%<const%> and %<volatile%> function specifiers on "
6722 "%qD invalid in type declaration", object);
6726 error ("%qD declared as a %<virtual%> field", object);
6728 error ("%qD declared as an %<inline%> field", object);
6730 error ("%<const%> and %<volatile%> function specifiers on "
6731 "%qD invalid in field declaration", object);
6737 error ("%q+D declared as a friend", object);
6739 && (TREE_CODE (object) == TYPE_DECL
6740 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6741 && !TYPE_REFFN_P (TREE_TYPE (object))
6742 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6743 error ("%q+D declared with an exception specification", object);
6746 /* DECL is a member function or static data member and is presently
6747 being defined. Check that the definition is taking place in a
6751 check_class_member_definition_namespace (tree decl)
6753 /* These checks only apply to member functions and static data
6755 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6756 || TREE_CODE (decl) == VAR_DECL);
6757 /* We check for problems with specializations in pt.c in
6758 check_specialization_namespace, where we can issue better
6760 if (processing_specialization)
6762 /* There are no restrictions on the placement of
6763 explicit instantiations. */
6764 if (processing_explicit_instantiation)
6768 A member function definition that appears outside of the
6769 class definition shall appear in a namespace scope enclosing
6770 the class definition.
6774 The definition for a static data member shall appear in a
6775 namespace scope enclosing the member's class definition. */
6776 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6777 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6778 decl, DECL_CONTEXT (decl));
6781 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6782 METHOD_TYPE for a non-static member function; QUALS are the
6783 cv-qualifiers that apply to the function. */
6786 build_this_parm (tree type, cp_cv_quals quals)
6791 cp_cv_quals this_quals;
6793 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6794 /* The `this' parameter is implicitly `const'; it cannot be
6796 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6797 qual_type = cp_build_qualified_type (this_type, this_quals);
6798 parm = build_artificial_parm (this_identifier, qual_type);
6799 cp_apply_type_quals_to_decl (this_quals, parm);
6803 /* CTYPE is class type, or null if non-class.
6804 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6806 DECLARATOR is the function's name.
6807 PARMS is a chain of PARM_DECLs for the function.
6808 VIRTUALP is truthvalue of whether the function is virtual or not.
6809 FLAGS are to be passed through to `grokclassfn'.
6810 QUALS are qualifiers indicating whether the function is `const'
6812 RAISES is a list of exceptions that this function can raise.
6813 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6814 not look, and -1 if we should not call `grokclassfn' at all.
6816 SFK is the kind of special function (if any) for the new function.
6818 Returns `NULL_TREE' if something goes wrong, after issuing
6819 applicable error messages. */
6822 grokfndecl (tree ctype,
6826 tree orig_declarator,
6828 enum overload_flags flags,
6835 special_function_kind sfk,
6840 location_t location)
6843 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6847 type = build_exception_variant (type, raises);
6849 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6851 /* If we have an explicit location, use it, otherwise use whatever
6852 build_lang_decl used (probably input_location). */
6853 if (location != UNKNOWN_LOCATION)
6854 DECL_SOURCE_LOCATION (decl) = location;
6856 if (TREE_CODE (type) == METHOD_TYPE)
6859 parm = build_this_parm (type, quals);
6860 DECL_CHAIN (parm) = parms;
6863 DECL_ARGUMENTS (decl) = parms;
6864 for (t = parms; t; t = DECL_CHAIN (t))
6865 DECL_CONTEXT (t) = decl;
6866 /* Propagate volatile out from type to decl. */
6867 if (TYPE_VOLATILE (type))
6868 TREE_THIS_VOLATILE (decl) = 1;
6870 /* Setup decl according to sfk. */
6873 case sfk_constructor:
6874 case sfk_copy_constructor:
6875 case sfk_move_constructor:
6876 DECL_CONSTRUCTOR_P (decl) = 1;
6878 case sfk_destructor:
6879 DECL_DESTRUCTOR_P (decl) = 1;
6885 /* If pointers to member functions use the least significant bit to
6886 indicate whether a function is virtual, ensure a pointer
6887 to this function will have that bit clear. */
6888 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6889 && TREE_CODE (type) == METHOD_TYPE
6890 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6891 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6894 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6898 ("defining explicit specialization %qD in friend declaration",
6902 tree fns = TREE_OPERAND (orig_declarator, 0);
6903 tree args = TREE_OPERAND (orig_declarator, 1);
6905 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6907 /* Something like `template <class T> friend void f<T>()'. */
6908 error ("invalid use of template-id %qD in declaration "
6909 "of primary template",
6915 /* A friend declaration of the form friend void f<>(). Record
6916 the information in the TEMPLATE_ID_EXPR. */
6917 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6919 if (TREE_CODE (fns) == COMPONENT_REF)
6921 /* Due to bison parser ickiness, we will have already looked
6922 up an operator_name or PFUNCNAME within the current class
6923 (see template_id in parse.y). If the current class contains
6924 such a name, we'll get a COMPONENT_REF here. Undo that. */
6926 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6927 == current_class_type);
6928 fns = TREE_OPERAND (fns, 1);
6930 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6931 || TREE_CODE (fns) == OVERLOAD);
6932 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6934 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6935 if (TREE_PURPOSE (t)
6936 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6938 error ("default arguments are not allowed in declaration "
6939 "of friend template specialization %qD",
6946 error ("%<inline%> is not allowed in declaration of friend "
6947 "template specialization %qD",
6954 /* If this decl has namespace scope, set that up. */
6956 set_decl_namespace (decl, in_namespace, friendp);
6958 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6960 /* `main' and builtins have implicit 'C' linkage. */
6961 if ((MAIN_NAME_P (declarator)
6962 || (IDENTIFIER_LENGTH (declarator) > 10
6963 && IDENTIFIER_POINTER (declarator)[0] == '_'
6964 && IDENTIFIER_POINTER (declarator)[1] == '_'
6965 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6966 && current_lang_name == lang_name_cplusplus
6967 && ctype == NULL_TREE
6968 && DECL_FILE_SCOPE_P (decl))
6969 SET_DECL_LANGUAGE (decl, lang_c);
6971 /* Should probably propagate const out from type to decl I bet (mrs). */
6974 DECL_STATIC_FUNCTION_P (decl) = 1;
6975 DECL_CONTEXT (decl) = ctype;
6980 DECL_CONTEXT (decl) = ctype;
6982 check_class_member_definition_namespace (decl);
6985 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6987 if (processing_template_decl)
6988 error ("cannot declare %<::main%> to be a template");
6990 error ("cannot declare %<::main%> to be inline");
6992 error ("cannot declare %<::main%> to be static");
6997 /* Members of anonymous types and local classes have no linkage; make
6998 them internal. If a typedef is made later, this will be changed. */
6999 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7000 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7003 if (publicp && cxx_dialect == cxx98)
7005 /* [basic.link]: A name with no linkage (notably, the name of a class
7006 or enumeration declared in a local scope) shall not be used to
7007 declare an entity with linkage.
7009 DR 757 relaxes this restriction for C++0x. */
7010 t = no_linkage_check (TREE_TYPE (decl),
7011 /*relaxed_p=*/false);
7014 if (TYPE_ANONYMOUS_P (t))
7016 if (DECL_EXTERN_C_P (decl))
7017 /* Allow this; it's pretty common in C. */;
7020 permerror (input_location, "anonymous type with no linkage "
7021 "used to declare function %q#D with linkage",
7023 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7024 permerror (input_location, "%q+#D does not refer to the unqualified "
7025 "type, so it is not used for linkage",
7030 permerror (input_location, "type %qT with no linkage used to "
7031 "declare function %q#D with linkage", t, decl);
7035 TREE_PUBLIC (decl) = publicp;
7038 DECL_INTERFACE_KNOWN (decl) = 1;
7039 DECL_NOT_REALLY_EXTERN (decl) = 1;
7042 /* If the declaration was declared inline, mark it as such. */
7044 DECL_DECLARED_INLINE_P (decl) = 1;
7046 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7048 DECL_EXTERNAL (decl) = 1;
7049 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7052 ? G_("static member function %qD cannot have cv-qualifier")
7053 : G_("non-member function %qD cannot have cv-qualifier"),
7055 quals = TYPE_UNQUALIFIED;
7058 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7059 && !grok_op_properties (decl, /*complain=*/true))
7063 /* Make the init_value nonzero so pushdecl knows this is not
7064 tentative. error_mark_node is replaced later with the BLOCK. */
7065 DECL_INITIAL (decl) = error_mark_node;
7067 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7068 TREE_NOTHROW (decl) = 1;
7070 /* Caller will do the rest of this. */
7074 if (ctype != NULL_TREE)
7075 grokclassfn (ctype, decl, flags);
7077 decl = check_explicit_specialization (orig_declarator, decl,
7080 4 * (friendp != 0));
7081 if (decl == error_mark_node)
7086 cplus_decl_attributes (&decl, *attrlist, 0);
7087 *attrlist = NULL_TREE;
7090 /* Check main's type after attributes have been applied. */
7091 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7093 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7096 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7098 error ("%<::main%> must return %<int%>");
7099 newtype = build_function_type (integer_type_node, oldtypeargs);
7100 TREE_TYPE (decl) = newtype;
7103 check_main_parameter_types (decl);
7106 if (ctype != NULL_TREE
7107 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7110 tree old_decl = check_classfn (ctype, decl,
7111 (processing_template_decl
7112 > template_class_depth (ctype))
7113 ? current_template_parms
7116 if (old_decl == error_mark_node)
7124 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7125 /* Because grokfndecl is always supposed to return a
7126 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7127 here. We depend on our callers to figure out that its
7128 really a template that's being returned. */
7129 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7131 if (DECL_STATIC_FUNCTION_P (old_decl)
7132 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7133 /* Remove the `this' parm added by grokclassfn.
7134 XXX Isn't this done in start_function, too? */
7135 revert_static_member_fn (decl);
7136 if (DECL_ARTIFICIAL (old_decl))
7138 error ("definition of implicitly-declared %qD", old_decl);
7142 /* Since we've smashed OLD_DECL to its
7143 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7144 if (TREE_CODE (decl) == TEMPLATE_DECL)
7145 decl = DECL_TEMPLATE_RESULT (decl);
7147 /* Attempt to merge the declarations. This can fail, in
7148 the case of some invalid specialization declarations. */
7149 pushed_scope = push_scope (ctype);
7150 ok = duplicate_decls (decl, old_decl, friendp);
7152 pop_scope (pushed_scope);
7155 error ("no %q#D member function declared in class %qT",
7163 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7166 if (ctype == NULL_TREE || check)
7170 DECL_VIRTUAL_P (decl) = 1;
7175 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7176 the linkage that DECL will receive in the object file. */
7179 set_linkage_for_static_data_member (tree decl)
7181 /* A static data member always has static storage duration and
7182 external linkage. Note that static data members are forbidden in
7183 local classes -- the only situation in which a class has
7184 non-external linkage. */
7185 TREE_PUBLIC (decl) = 1;
7186 TREE_STATIC (decl) = 1;
7187 /* For non-template classes, static data members are always put
7188 out in exactly those files where they are defined, just as
7189 with ordinary namespace-scope variables. */
7190 if (!processing_template_decl)
7191 DECL_INTERFACE_KNOWN (decl) = 1;
7194 /* Create a VAR_DECL named NAME with the indicated TYPE.
7196 If SCOPE is non-NULL, it is the class type or namespace containing
7197 the variable. If SCOPE is NULL, the variable should is created in
7198 the innermost enclosings scope. */
7201 grokvardecl (tree type,
7203 const cp_decl_specifier_seq *declspecs,
7209 tree explicit_scope;
7211 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7213 /* Compute the scope in which to place the variable, but remember
7214 whether or not that scope was explicitly specified by the user. */
7215 explicit_scope = scope;
7218 /* An explicit "extern" specifier indicates a namespace-scope
7220 if (declspecs->storage_class == sc_extern)
7221 scope = current_decl_namespace ();
7222 else if (!at_function_scope_p ())
7223 scope = current_scope ();
7227 && (/* If the variable is a namespace-scope variable declared in a
7228 template, we need DECL_LANG_SPECIFIC. */
7229 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7230 /* Similarly for namespace-scope variables with language linkage
7232 || (TREE_CODE (scope) == NAMESPACE_DECL
7233 && current_lang_name != lang_name_cplusplus)
7234 /* Similarly for static data members. */
7236 decl = build_lang_decl (VAR_DECL, name, type);
7238 decl = build_decl (input_location, VAR_DECL, name, type);
7240 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7241 set_decl_namespace (decl, explicit_scope, 0);
7243 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7245 if (declspecs->storage_class == sc_extern)
7247 DECL_THIS_EXTERN (decl) = 1;
7248 DECL_EXTERNAL (decl) = !initialized;
7251 if (DECL_CLASS_SCOPE_P (decl))
7253 set_linkage_for_static_data_member (decl);
7254 /* This function is only called with out-of-class definitions. */
7255 DECL_EXTERNAL (decl) = 0;
7256 check_class_member_definition_namespace (decl);
7258 /* At top level, either `static' or no s.c. makes a definition
7259 (perhaps tentative), and absence of `static' makes it public. */
7260 else if (toplevel_bindings_p ())
7262 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7263 && (DECL_THIS_EXTERN (decl) || ! constp));
7264 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7266 /* Not at top level, only `static' makes a static definition. */
7269 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7270 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7273 if (declspecs->specs[(int)ds_thread])
7274 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7276 /* If the type of the decl has no linkage, make sure that we'll
7277 notice that in mark_used. */
7278 if (cxx_dialect > cxx98
7279 && decl_linkage (decl) != lk_none
7280 && DECL_LANG_SPECIFIC (decl) == NULL
7281 && !DECL_EXTERN_C_P (decl)
7282 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7283 retrofit_lang_decl (decl);
7285 if (TREE_PUBLIC (decl))
7287 /* [basic.link]: A name with no linkage (notably, the name of a class
7288 or enumeration declared in a local scope) shall not be used to
7289 declare an entity with linkage.
7291 DR 757 relaxes this restriction for C++0x. */
7292 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7293 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7296 if (TYPE_ANONYMOUS_P (t))
7298 if (DECL_EXTERN_C_P (decl))
7299 /* Allow this; it's pretty common in C. */
7303 /* DRs 132, 319 and 389 seem to indicate types with
7304 no linkage can only be used to declare extern "C"
7305 entities. Since it's not always an error in the
7306 ISO C++ 90 Standard, we only issue a warning. */
7307 warning (0, "anonymous type with no linkage used to declare "
7308 "variable %q#D with linkage", decl);
7309 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7310 warning (0, "%q+#D does not refer to the unqualified "
7311 "type, so it is not used for linkage",
7316 warning (0, "type %qT with no linkage used to declare variable "
7317 "%q#D with linkage", t, decl);
7321 DECL_INTERFACE_KNOWN (decl) = 1;
7326 /* Create and return a canonical pointer to member function type, for
7327 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7330 build_ptrmemfunc_type (tree type)
7334 tree unqualified_variant = NULL_TREE;
7336 if (type == error_mark_node)
7339 /* If a canonical type already exists for this type, use it. We use
7340 this method instead of type_hash_canon, because it only does a
7341 simple equality check on the list of field members. */
7343 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7346 /* Make sure that we always have the unqualified pointer-to-member
7348 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7350 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7352 t = make_class_type (RECORD_TYPE);
7353 xref_basetypes (t, NULL_TREE);
7355 /* Let the front end know this is a pointer to member function... */
7356 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7357 /* ... and not really a class type. */
7358 SET_CLASS_TYPE_P (t, 0);
7360 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7363 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7365 DECL_CHAIN (field) = fields;
7368 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7370 /* Zap out the name so that the back end will give us the debugging
7371 information for this anonymous RECORD_TYPE. */
7372 TYPE_NAME (t) = NULL_TREE;
7374 /* If this is not the unqualified form of this pointer-to-member
7375 type, set the TYPE_MAIN_VARIANT for this type to be the
7376 unqualified type. Since they are actually RECORD_TYPEs that are
7377 not variants of each other, we must do this manually.
7378 As we just built a new type there is no need to do yet another copy. */
7379 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7381 int type_quals = cp_type_quals (type);
7382 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7383 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7384 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7385 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7386 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7387 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7388 TREE_TYPE (TYPE_BINFO (t)) = t;
7391 /* Cache this pointer-to-member type so that we can find it again
7393 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7395 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7396 SET_TYPE_STRUCTURAL_EQUALITY (t);
7397 else if (TYPE_CANONICAL (type) != type)
7398 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7403 /* Create and return a pointer to data member type. */
7406 build_ptrmem_type (tree class_type, tree member_type)
7408 if (TREE_CODE (member_type) == METHOD_TYPE)
7410 cp_cv_quals quals = type_memfn_quals (member_type);
7411 member_type = build_memfn_type (member_type, class_type, quals);
7412 return build_ptrmemfunc_type (build_pointer_type (member_type));
7416 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7417 return build_offset_type (class_type, member_type);
7421 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7422 Check to see that the definition is valid. Issue appropriate error
7423 messages. Return 1 if the definition is particularly bad, or 0
7427 check_static_variable_definition (tree decl, tree type)
7429 /* If DECL is declared constexpr, we'll do the appropriate checks
7430 in check_initializer. */
7431 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7433 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7435 if (literal_type_p (type))
7436 error ("%<constexpr%> needed for in-class initialization of static "
7437 "data member %q#D of non-integral type", decl);
7439 error ("in-class initialization of static data member %q#D of "
7440 "non-literal type", decl);
7444 /* Motion 10 at San Diego: If a static const integral data member is
7445 initialized with an integral constant expression, the initializer
7446 may appear either in the declaration (within the class), or in
7447 the definition, but not both. If it appears in the class, the
7448 member is a member constant. The file-scope definition is always
7450 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7452 error ("invalid in-class initialization of static data member "
7453 "of non-integral type %qT",
7457 else if (!CP_TYPE_CONST_P (type))
7458 error ("ISO C++ forbids in-class initialization of non-const "
7459 "static member %qD",
7461 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7462 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7463 "%qD of non-integral type %qT", decl, type);
7468 /* Given the SIZE (i.e., number of elements) in an array, compute an
7469 appropriate index type for the array. If non-NULL, NAME is the
7470 name of the thing being declared. */
7473 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7478 tree abi_1_itype = NULL_TREE;
7480 if (error_operand_p (size))
7481 return error_mark_node;
7483 type = TREE_TYPE (size);
7484 /* type_dependent_expression_p? */
7485 if (!dependent_type_p (type))
7487 mark_rvalue_use (size);
7489 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7490 && TREE_SIDE_EFFECTS (size))
7491 /* In C++98, we mark a non-constant array bound with a magic
7492 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7495 size = fold_non_dependent_expr (size);
7497 if (CLASS_TYPE_P (type)
7498 && CLASSTYPE_LITERAL_P (type))
7500 size = build_expr_type_conversion (WANT_INT, size, true);
7501 if (size == error_mark_node)
7502 return error_mark_node;
7503 type = TREE_TYPE (size);
7506 size = maybe_constant_value (size);
7509 if (error_operand_p (size))
7510 return error_mark_node;
7512 /* The array bound must be an integer type. */
7513 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7515 if (!(complain & tf_error))
7516 return error_mark_node;
7518 error ("size of array %qD has non-integral type %qT", name, type);
7520 error ("size of array has non-integral type %qT", type);
7521 size = integer_one_node;
7522 type = TREE_TYPE (size);
7526 /* A type is dependent if it is...an array type constructed from any
7527 dependent type or whose size is specified by a constant expression
7528 that is value-dependent. */
7529 /* We can only call value_dependent_expression_p on integral constant
7530 expressions; treat non-constant expressions as dependent, too. */
7531 if (processing_template_decl
7532 && (dependent_type_p (type)
7533 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7535 /* We cannot do any checking for a SIZE that isn't known to be
7536 constant. Just build the index type and mark that it requires
7537 structural equality checks. */
7538 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7539 size, integer_one_node));
7540 TYPE_DEPENDENT_P (itype) = 1;
7541 TYPE_DEPENDENT_P_VALID (itype) = 1;
7542 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7546 if (!abi_version_at_least (2) && processing_template_decl)
7547 /* For abi-1, we handled all instances in templates the same way,
7548 even when they were non-dependent. This affects the manglings
7549 produced. So, we do the normal checking for non-dependent
7550 sizes, but at the end we'll return the same type that abi-1
7551 would have, but with TYPE_CANONICAL set to the "right"
7552 value that the current ABI would provide. */
7553 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7554 osize, integer_one_node));
7556 /* Normally, the array-bound will be a constant. */
7557 if (TREE_CODE (size) == INTEGER_CST)
7559 /* Check to see if the array bound overflowed. Make that an
7560 error, no matter how generous we're being. */
7561 constant_expression_error (size);
7563 /* An array must have a positive number of elements. */
7564 if (INT_CST_LT (size, integer_zero_node))
7566 if (!(complain & tf_error))
7567 return error_mark_node;
7569 error ("size of array %qD is negative", name);
7571 error ("size of array is negative");
7572 size = integer_one_node;
7574 /* As an extension we allow zero-sized arrays. */
7575 else if (integer_zerop (size))
7577 if (!(complain & tf_error))
7578 /* We must fail if performing argument deduction (as
7579 indicated by the state of complain), so that
7580 another substitution can be found. */
7581 return error_mark_node;
7582 else if (in_system_header)
7583 /* Allow them in system headers because glibc uses them. */;
7585 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7587 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7590 else if (TREE_CONSTANT (size)
7591 /* We don't allow VLAs at non-function scopes, or during
7592 tentative template substitution. */
7593 || !at_function_scope_p () || !(complain & tf_error))
7595 if (!(complain & tf_error))
7596 return error_mark_node;
7597 /* `(int) &fn' is not a valid array bound. */
7599 error ("size of array %qD is not an integral constant-expression",
7602 error ("size of array is not an integral constant-expression");
7603 size = integer_one_node;
7605 else if (pedantic && warn_vla != 0)
7608 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7610 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7612 else if (warn_vla > 0)
7616 "variable length array %qD is used", name);
7619 "variable length array is used");
7622 if (processing_template_decl && !TREE_CONSTANT (size))
7623 /* A variable sized array. */
7624 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7627 HOST_WIDE_INT saved_processing_template_decl;
7629 /* Compute the index of the largest element in the array. It is
7630 one less than the number of elements in the array. We save
7631 and restore PROCESSING_TEMPLATE_DECL so that computations in
7632 cp_build_binary_op will be appropriately folded. */
7633 saved_processing_template_decl = processing_template_decl;
7634 processing_template_decl = 0;
7635 itype = cp_build_binary_op (input_location,
7637 cp_convert (ssizetype, size),
7638 cp_convert (ssizetype, integer_one_node),
7639 tf_warning_or_error);
7640 itype = fold (itype);
7641 processing_template_decl = saved_processing_template_decl;
7643 if (!TREE_CONSTANT (itype))
7644 /* A variable sized array. */
7645 itype = variable_size (itype);
7646 /* Make sure that there was no overflow when creating to a signed
7647 index type. (For example, on a 32-bit machine, an array with
7648 size 2^32 - 1 is too big.) */
7649 else if (TREE_CODE (itype) == INTEGER_CST
7650 && TREE_OVERFLOW (itype))
7652 if (!(complain & tf_error))
7653 return error_mark_node;
7654 error ("overflow in array dimension");
7655 TREE_OVERFLOW (itype) = 0;
7659 /* Create and return the appropriate index type. */
7662 tree t = build_index_type (itype);
7663 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7664 itype = abi_1_itype;
7667 itype = build_index_type (itype);
7669 /* If the index type were dependent, we would have returned early, so
7670 remember that it isn't. */
7671 TYPE_DEPENDENT_P (itype) = 0;
7672 TYPE_DEPENDENT_P_VALID (itype) = 1;
7676 /* Returns the scope (if any) in which the entity declared by
7677 DECLARATOR will be located. If the entity was declared with an
7678 unqualified name, NULL_TREE is returned. */
7681 get_scope_of_declarator (const cp_declarator *declarator)
7683 while (declarator && declarator->kind != cdk_id)
7684 declarator = declarator->declarator;
7686 /* If the declarator-id is a SCOPE_REF, the scope in which the
7687 declaration occurs is the first operand. */
7689 && declarator->u.id.qualifying_scope)
7690 return declarator->u.id.qualifying_scope;
7692 /* Otherwise, the declarator is not a qualified name; the entity will
7693 be declared in the current scope. */
7697 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7698 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7702 create_array_type_for_decl (tree name, tree type, tree size)
7704 tree itype = NULL_TREE;
7706 /* If things have already gone awry, bail now. */
7707 if (type == error_mark_node || size == error_mark_node)
7708 return error_mark_node;
7710 /* If there are some types which cannot be array elements,
7711 issue an error-message and return. */
7712 switch (TREE_CODE (type))
7716 error ("declaration of %qD as array of void", name);
7718 error ("creating array of void");
7719 return error_mark_node;
7723 error ("declaration of %qD as array of functions", name);
7725 error ("creating array of functions");
7726 return error_mark_node;
7728 case REFERENCE_TYPE:
7730 error ("declaration of %qD as array of references", name);
7732 error ("creating array of references");
7733 return error_mark_node;
7737 error ("declaration of %qD as array of function members", name);
7739 error ("creating array of function members");
7740 return error_mark_node;
7748 The constant expressions that specify the bounds of the arrays
7749 can be omitted only for the first member of the sequence. */
7750 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7753 error ("declaration of %qD as multidimensional array must "
7754 "have bounds for all dimensions except the first",
7757 error ("multidimensional array must have bounds for all "
7758 "dimensions except the first");
7760 return error_mark_node;
7763 /* Figure out the index type for the array. */
7765 itype = compute_array_index_type (name, size, tf_warning_or_error);
7768 T is called the array element type; this type shall not be [...] an
7769 abstract class type. */
7770 abstract_virtuals_error (name, type);
7772 return build_cplus_array_type (type, itype);
7775 /* Check that it's OK to declare a function with the indicated TYPE.
7776 SFK indicates the kind of special function (if any) that this
7777 function is. OPTYPE is the type given in a conversion operator
7778 declaration, or the class type for a constructor/destructor.
7779 Returns the actual return type of the function; that
7780 may be different than TYPE if an error occurs, or for certain
7781 special functions. */
7784 check_special_function_return_type (special_function_kind sfk,
7790 case sfk_constructor:
7792 error ("return type specification for constructor invalid");
7794 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7795 type = build_pointer_type (optype);
7797 type = void_type_node;
7800 case sfk_destructor:
7802 error ("return type specification for destructor invalid");
7803 /* We can't use the proper return type here because we run into
7804 problems with ambiguous bases and covariant returns.
7805 Java classes are left unchanged because (void *) isn't a valid
7806 Java type, and we don't want to change the Java ABI. */
7807 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7808 type = build_pointer_type (void_type_node);
7810 type = void_type_node;
7813 case sfk_conversion:
7815 error ("return type specified for %<operator %T%>", optype);
7826 /* A variable or data member (whose unqualified name is IDENTIFIER)
7827 has been declared with the indicated TYPE. If the TYPE is not
7828 acceptable, issue an error message and return a type to use for
7829 error-recovery purposes. */
7832 check_var_type (tree identifier, tree type)
7834 if (VOID_TYPE_P (type))
7837 error ("unnamed variable or field declared void");
7838 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7840 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7841 error ("variable or field %qE declared void", identifier);
7844 error ("variable or field declared void");
7845 type = error_mark_node;
7851 /* Given declspecs and a declarator (abstract or otherwise), determine
7852 the name and type of the object declared and construct a DECL node
7855 DECLSPECS points to the representation of declaration-specifier
7856 sequence that precedes declarator.
7858 DECL_CONTEXT says which syntactic context this declaration is in:
7859 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7860 FUNCDEF for a function definition. Like NORMAL but a few different
7861 error messages in each case. Return value may be zero meaning
7862 this definition is too screwy to try to parse.
7863 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7864 handle member functions (which have FIELD context).
7865 Return value may be zero meaning this definition is too screwy to
7867 PARM for a parameter declaration (either within a function prototype
7868 or before a function body). Make a PARM_DECL, or return void_type_node.
7869 TPARM for a template parameter declaration.
7870 CATCHPARM for a parameter declaration before a catch clause.
7871 TYPENAME if for a typename (in a cast or sizeof).
7872 Don't make a DECL node; just return the ..._TYPE node.
7873 FIELD for a struct or union field; make a FIELD_DECL.
7874 BITFIELD for a field with specified width.
7876 INITIALIZED is as for start_decl.
7878 ATTRLIST is a pointer to the list of attributes, which may be NULL
7879 if there are none; *ATTRLIST may be modified if attributes from inside
7880 the declarator should be applied to the declaration.
7882 When this function is called, scoping variables (such as
7883 CURRENT_CLASS_TYPE) should reflect the scope in which the
7884 declaration occurs, not the scope in which the new declaration will
7885 be placed. For example, on:
7889 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7892 Returns a DECL (if a declarator is present), a TYPE (if there is no
7893 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7897 grokdeclarator (const cp_declarator *declarator,
7898 const cp_decl_specifier_seq *declspecs,
7899 enum decl_context decl_context,
7903 tree type = NULL_TREE;
7905 int explicit_int128 = 0;
7906 int virtualp, explicitp, friendp, inlinep, staticp;
7907 int explicit_int = 0;
7908 int explicit_char = 0;
7909 int defaulted_int = 0;
7910 tree dependent_name = NULL_TREE;
7912 tree typedef_decl = NULL_TREE;
7913 const char *name = NULL;
7914 tree typedef_type = NULL_TREE;
7915 /* True if this declarator is a function definition. */
7916 bool funcdef_flag = false;
7917 cp_declarator_kind innermost_code = cdk_error;
7920 /* See the code below that used this. */
7921 tree decl_attr = NULL_TREE;
7924 /* Keep track of what sort of function is being processed
7925 so that we can warn about default return values, or explicit
7926 return values which do not match prescribed defaults. */
7927 special_function_kind sfk = sfk_none;
7929 tree dname = NULL_TREE;
7930 tree ctor_return_type = NULL_TREE;
7931 enum overload_flags flags = NO_SPECIAL;
7932 /* cv-qualifiers that apply to the declarator, for a declaration of
7933 a member function. */
7934 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7935 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7937 tree raises = NULL_TREE;
7938 int template_count = 0;
7939 tree returned_attrs = NULL_TREE;
7940 tree parms = NULL_TREE;
7941 const cp_declarator *id_declarator;
7942 /* The unqualified name of the declarator; either an
7943 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7944 tree unqualified_id;
7945 /* The class type, if any, in which this entity is located,
7946 or NULL_TREE if none. Note that this value may be different from
7947 the current class type; for example if an attempt is made to declare
7948 "A::f" inside "B", this value will be "A". */
7949 tree ctype = current_class_type;
7950 /* The NAMESPACE_DECL for the namespace in which this entity is
7951 located. If an unqualified name is used to declare the entity,
7952 this value will be NULL_TREE, even if the entity is located at
7954 tree in_namespace = NULL_TREE;
7955 cp_storage_class storage_class;
7956 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7957 bool type_was_error_mark_node = false;
7958 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7959 bool template_type_arg = false;
7960 bool template_parm_flag = false;
7961 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7964 signed_p = declspecs->specs[(int)ds_signed];
7965 unsigned_p = declspecs->specs[(int)ds_unsigned];
7966 short_p = declspecs->specs[(int)ds_short];
7967 long_p = declspecs->specs[(int)ds_long];
7968 longlong = declspecs->specs[(int)ds_long] >= 2;
7969 explicit_int128 = declspecs->explicit_int128_p;
7970 thread_p = declspecs->specs[(int)ds_thread];
7972 if (decl_context == FUNCDEF)
7973 funcdef_flag = true, decl_context = NORMAL;
7974 else if (decl_context == MEMFUNCDEF)
7975 funcdef_flag = true, decl_context = FIELD;
7976 else if (decl_context == BITFIELD)
7977 bitfield = 1, decl_context = FIELD;
7978 else if (decl_context == TEMPLATE_TYPE_ARG)
7979 template_type_arg = true, decl_context = TYPENAME;
7980 else if (decl_context == TPARM)
7981 template_parm_flag = true, decl_context = PARM;
7983 if (initialized > 1)
7984 funcdef_flag = true;
7986 /* Look inside a declarator for the name being declared
7987 and get it as a string, for an error message. */
7988 for (id_declarator = declarator;
7990 id_declarator = id_declarator->declarator)
7992 if (id_declarator->kind != cdk_id)
7993 innermost_code = id_declarator->kind;
7995 switch (id_declarator->kind)
7998 if (id_declarator->declarator
7999 && id_declarator->declarator->kind == cdk_id)
8001 sfk = id_declarator->declarator->u.id.sfk;
8002 if (sfk == sfk_destructor)
8009 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8010 tree decl = id_declarator->u.id.unqualified_name;
8013 if (qualifying_scope)
8015 if (at_function_scope_p ())
8019 A declarator-id shall not be qualified except
8022 None of the cases are permitted in block
8024 if (qualifying_scope == global_namespace)
8025 error ("invalid use of qualified-name %<::%D%>",
8027 else if (TYPE_P (qualifying_scope))
8028 error ("invalid use of qualified-name %<%T::%D%>",
8029 qualifying_scope, decl);
8031 error ("invalid use of qualified-name %<%D::%D%>",
8032 qualifying_scope, decl);
8033 return error_mark_node;
8035 else if (TYPE_P (qualifying_scope))
8037 ctype = qualifying_scope;
8038 if (innermost_code != cdk_function
8039 && current_class_type
8040 && !UNIQUELY_DERIVED_FROM_P (ctype,
8041 current_class_type))
8043 error ("type %qT is not derived from type %qT",
8044 ctype, current_class_type);
8045 return error_mark_node;
8048 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8049 in_namespace = qualifying_scope;
8051 switch (TREE_CODE (decl))
8057 if (innermost_code != cdk_function)
8059 error ("declaration of %qD as non-function", decl);
8060 return error_mark_node;
8062 else if (!qualifying_scope
8063 && !(current_class_type && at_class_scope_p ()))
8065 error ("declaration of %qD as non-member", decl);
8066 return error_mark_node;
8069 type = TREE_OPERAND (decl, 0);
8071 type = constructor_name (type);
8072 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8077 case TEMPLATE_ID_EXPR:
8079 tree fns = TREE_OPERAND (decl, 0);
8082 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8084 gcc_assert (is_overloaded_fn (dname));
8085 dname = DECL_NAME (get_first_fn (dname));
8090 case IDENTIFIER_NODE:
8091 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8094 if (C_IS_RESERVED_WORD (dname))
8096 error ("declarator-id missing; using reserved word %qD",
8098 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8100 else if (!IDENTIFIER_TYPENAME_P (dname))
8101 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8104 gcc_assert (flags == NO_SPECIAL);
8105 flags = TYPENAME_FLAG;
8106 ctor_return_type = TREE_TYPE (dname);
8107 sfk = sfk_conversion;
8108 if (is_typename_at_global_scope (dname))
8109 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8111 name = "<invalid operator>";
8128 return error_mark_node;
8133 if (id_declarator->kind == cdk_id)
8139 The declarator in a function-definition shall have the form
8140 D1 ( parameter-declaration-clause) ... */
8141 if (funcdef_flag && innermost_code != cdk_function)
8143 error ("function definition does not declare parameters");
8144 return error_mark_node;
8147 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8148 && innermost_code != cdk_function
8149 && ! (ctype && !declspecs->any_specifiers_p))
8151 error ("declaration of %qD as non-function", dname);
8152 return error_mark_node;
8155 /* Anything declared one level down from the top level
8156 must be one of the parameters of a function
8157 (because the body is at least two levels down). */
8159 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8160 by not allowing C++ class definitions to specify their parameters
8161 with xdecls (must be spec.d in the parmlist).
8163 Since we now wait to push a class scope until we are sure that
8164 we are in a legitimate method context, we must set oldcname
8165 explicitly (since current_class_name is not yet alive).
8167 We also want to avoid calling this a PARM if it is in a namespace. */
8169 if (decl_context == NORMAL && !toplevel_bindings_p ())
8171 struct cp_binding_level *b = current_binding_level;
8172 current_binding_level = b->level_chain;
8173 if (current_binding_level != 0 && toplevel_bindings_p ())
8174 decl_context = PARM;
8175 current_binding_level = b;
8179 name = decl_context == PARM ? "parameter" : "type name";
8181 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8183 error ("%<constexpr%> cannot appear in a typedef declaration");
8184 return error_mark_node;
8187 /* If there were multiple types specified in the decl-specifier-seq,
8188 issue an error message. */
8189 if (declspecs->multiple_types_p)
8191 error ("two or more data types in declaration of %qs", name);
8192 return error_mark_node;
8195 if (declspecs->conflicting_specifiers_p)
8197 error ("conflicting specifiers in declaration of %qs", name);
8198 return error_mark_node;
8201 /* Extract the basic type from the decl-specifier-seq. */
8202 type = declspecs->type;
8203 if (type == error_mark_node)
8206 type_was_error_mark_node = true;
8208 /* If the entire declaration is itself tagged as deprecated then
8209 suppress reports of deprecated items. */
8210 if (type && TREE_DEPRECATED (type)
8211 && deprecated_state != DEPRECATED_SUPPRESS)
8212 warn_deprecated_use (type, NULL_TREE);
8213 if (type && TREE_CODE (type) == TYPE_DECL)
8215 typedef_decl = type;
8216 type = TREE_TYPE (typedef_decl);
8217 if (TREE_DEPRECATED (type)
8218 && DECL_ARTIFICIAL (typedef_decl)
8219 && deprecated_state != DEPRECATED_SUPPRESS)
8220 warn_deprecated_use (type, NULL_TREE);
8222 /* No type at all: default to `int', and set DEFAULTED_INT
8223 because it was not a user-defined typedef. */
8224 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8226 /* These imply 'int'. */
8227 type = integer_type_node;
8231 explicit_int = declspecs->explicit_int_p;
8232 explicit_char = declspecs->explicit_char_p;
8235 /* See the code below that used this. */
8237 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8239 typedef_type = type;
8242 if (sfk != sfk_conversion)
8243 ctor_return_type = ctype;
8245 if (sfk != sfk_none)
8246 type = check_special_function_return_type (sfk, type,
8248 else if (type == NULL_TREE)
8254 /* We handle `main' specially here, because 'main () { }' is so
8255 common. With no options, it is allowed. With -Wreturn-type,
8256 it is a warning. It is only an error with -pedantic-errors. */
8257 is_main = (funcdef_flag
8258 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8259 && MAIN_NAME_P (dname)
8260 && ctype == NULL_TREE
8261 && in_namespace == NULL_TREE
8262 && current_namespace == global_namespace);
8264 if (type_was_error_mark_node)
8265 /* We've already issued an error, don't complain more. */;
8266 else if (in_system_header || flag_ms_extensions)
8267 /* Allow it, sigh. */;
8269 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8271 pedwarn (input_location, OPT_pedantic,
8272 "ISO C++ forbids declaration of %qs with no type", name);
8274 warning (OPT_Wreturn_type,
8275 "ISO C++ forbids declaration of %qs with no type", name);
8277 type = integer_type_node;
8282 /* Now process the modifiers that were specified
8283 and check for invalid combinations. */
8285 /* Long double is a special combination. */
8286 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8289 type = cp_build_qualified_type (long_double_type_node,
8290 cp_type_quals (type));
8293 /* Check all other uses of type modifiers. */
8295 if (unsigned_p || signed_p || long_p || short_p)
8299 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8300 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8301 else if (signed_p && unsigned_p)
8302 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8303 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8304 error ("%<long long%> invalid for %qs", name);
8305 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8306 error ("%<__int128%> invalid for %qs", name);
8307 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8308 error ("%<long%> invalid for %qs", name);
8309 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8310 error ("%<short%> invalid for %qs", name);
8311 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8312 error ("%<long%> or %<short%> invalid for %qs", name);
8313 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8314 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8315 else if ((long_p || short_p) && explicit_char)
8316 error ("%<long%> or %<short%> specified with char for %qs", name);
8317 else if (long_p && short_p)
8318 error ("%<long%> and %<short%> specified together for %qs", name);
8319 else if (type == char16_type_node || type == char32_type_node)
8321 if (signed_p || unsigned_p)
8322 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8323 else if (short_p || long_p)
8324 error ("%<short%> or %<long%> invalid for %qs", name);
8329 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8331 pedwarn (input_location, OPT_pedantic,
8332 "long, short, signed or unsigned used invalidly for %qs",
8334 if (flag_pedantic_errors)
8337 if (explicit_int128)
8339 if (int128_integer_type_node == NULL_TREE)
8341 error ("%<__int128%> is not supported by this target");
8346 pedwarn (input_location, OPT_pedantic,
8347 "ISO C++ does not support %<__int128%> for %qs",
8349 if (flag_pedantic_errors)
8355 /* Discard the type modifiers if they are invalid. */
8363 explicit_int128 = false;
8367 /* Decide whether an integer type is signed or not.
8368 Optionally treat bitfields as signed by default. */
8372 It is implementation-defined whether a plain (neither
8373 explicitly signed or unsigned) char, short, int, or long
8374 bit-field is signed or unsigned.
8376 Naturally, we extend this to long long as well. Note that
8377 this does not include wchar_t. */
8378 || (bitfield && !flag_signed_bitfields
8380 /* A typedef for plain `int' without `signed' can be
8381 controlled just like plain `int', but a typedef for
8382 `signed int' cannot be so controlled. */
8384 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8385 && TREE_CODE (type) == INTEGER_TYPE
8386 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8388 if (explicit_int128)
8389 type = int128_unsigned_type_node;
8391 type = long_long_unsigned_type_node;
8393 type = long_unsigned_type_node;
8395 type = short_unsigned_type_node;
8396 else if (type == char_type_node)
8397 type = unsigned_char_type_node;
8398 else if (typedef_decl)
8399 type = unsigned_type_for (type);
8401 type = unsigned_type_node;
8403 else if (signed_p && type == char_type_node)
8404 type = signed_char_type_node;
8405 else if (explicit_int128)
8406 type = int128_integer_type_node;
8408 type = long_long_integer_type_node;
8410 type = long_integer_type_node;
8412 type = short_integer_type_node;
8414 if (declspecs->specs[(int)ds_complex])
8416 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8417 error ("complex invalid for %qs", name);
8418 /* If we just have "complex", it is equivalent to
8419 "complex double", but if any modifiers at all are specified it is
8420 the complex form of TYPE. E.g, "complex short" is
8421 "complex short int". */
8422 else if (defaulted_int && ! longlong && ! explicit_int128
8423 && ! (long_p || short_p || signed_p || unsigned_p))
8424 type = complex_double_type_node;
8425 else if (type == integer_type_node)
8426 type = complex_integer_type_node;
8427 else if (type == float_type_node)
8428 type = complex_float_type_node;
8429 else if (type == double_type_node)
8430 type = complex_double_type_node;
8431 else if (type == long_double_type_node)
8432 type = complex_long_double_type_node;
8434 type = build_complex_type (type);
8437 type_quals = TYPE_UNQUALIFIED;
8438 if (declspecs->specs[(int)ds_const])
8439 type_quals |= TYPE_QUAL_CONST;
8440 if (declspecs->specs[(int)ds_volatile])
8441 type_quals |= TYPE_QUAL_VOLATILE;
8442 if (declspecs->specs[(int)ds_restrict])
8443 type_quals |= TYPE_QUAL_RESTRICT;
8444 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8445 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8448 type_quals |= cp_type_quals (type);
8449 type = cp_build_qualified_type_real
8450 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8451 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8452 /* We might have ignored or rejected some of the qualifiers. */
8453 type_quals = cp_type_quals (type);
8456 inlinep = !! declspecs->specs[(int)ds_inline];
8457 virtualp = !! declspecs->specs[(int)ds_virtual];
8458 explicitp = !! declspecs->specs[(int)ds_explicit];
8460 storage_class = declspecs->storage_class;
8461 if (storage_class == sc_static)
8462 staticp = 1 + (decl_context == FIELD);
8464 if (virtualp && staticp == 2)
8466 error ("member %qD cannot be declared both virtual and static", dname);
8467 storage_class = sc_none;
8470 friendp = !! declspecs->specs[(int)ds_friend];
8472 if (dependent_name && !friendp)
8474 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8475 return error_mark_node;
8478 /* Issue errors about use of storage classes for parameters. */
8479 if (decl_context == PARM)
8481 if (declspecs->specs[(int)ds_typedef])
8483 error ("typedef declaration invalid in parameter declaration");
8484 return error_mark_node;
8486 else if (template_parm_flag && storage_class != sc_none)
8488 error ("storage class specified for template parameter %qs", name);
8489 return error_mark_node;
8491 else if (storage_class == sc_static
8492 || storage_class == sc_extern
8494 error ("storage class specifiers invalid in parameter declarations");
8496 if (type_uses_auto (type))
8498 error ("parameter declared %<auto%>");
8499 type = error_mark_node;
8502 /* Function parameters cannot be constexpr. If we saw one, moan
8503 and pretend it wasn't there. */
8506 error ("a parameter cannot be declared %<constexpr%>");
8511 /* Give error if `virtual' is used outside of class declaration. */
8513 && (current_class_name == NULL_TREE || decl_context != FIELD))
8515 error ("%<virtual%> outside class declaration");
8519 /* Static anonymous unions are dealt with here. */
8520 if (staticp && decl_context == TYPENAME
8522 && ANON_AGGR_TYPE_P (declspecs->type))
8523 decl_context = FIELD;
8525 /* Warn about storage classes that are invalid for certain
8526 kinds of declarations (parameters, typenames, etc.). */
8529 && storage_class != sc_extern
8530 && storage_class != sc_static)
8531 || declspecs->specs[(int)ds_typedef]))
8533 error ("multiple storage classes in declaration of %qs", name);
8536 if (decl_context != NORMAL
8537 && ((storage_class != sc_none
8538 && storage_class != sc_mutable)
8541 if ((decl_context == PARM || decl_context == CATCHPARM)
8542 && (storage_class == sc_register
8543 || storage_class == sc_auto))
8545 else if (declspecs->specs[(int)ds_typedef])
8547 else if (decl_context == FIELD
8548 /* C++ allows static class elements. */
8549 && storage_class == sc_static)
8550 /* C++ also allows inlines and signed and unsigned elements,
8551 but in those cases we don't come in here. */
8555 if (decl_context == FIELD)
8556 error ("storage class specified for %qs", name);
8559 if (decl_context == PARM || decl_context == CATCHPARM)
8560 error ("storage class specified for parameter %qs", name);
8562 error ("storage class specified for typename");
8564 if (storage_class == sc_register
8565 || storage_class == sc_auto
8566 || storage_class == sc_extern
8568 storage_class = sc_none;
8571 else if (storage_class == sc_extern && funcdef_flag
8572 && ! toplevel_bindings_p ())
8573 error ("nested function %qs declared %<extern%>", name);
8574 else if (toplevel_bindings_p ())
8576 if (storage_class == sc_auto)
8577 error ("top-level declaration of %qs specifies %<auto%>", name);
8580 && storage_class != sc_extern
8581 && storage_class != sc_static)
8583 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8588 if (storage_class && friendp)
8590 error ("storage class specifiers invalid in friend function declarations");
8591 storage_class = sc_none;
8596 unqualified_id = NULL_TREE;
8599 unqualified_id = id_declarator->u.id.unqualified_name;
8600 switch (TREE_CODE (unqualified_id))
8603 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8604 if (TYPE_P (unqualified_id))
8605 unqualified_id = constructor_name (unqualified_id);
8608 case IDENTIFIER_NODE:
8609 case TEMPLATE_ID_EXPR:
8617 /* Determine the type of the entity declared by recurring on the
8619 for (; declarator; declarator = declarator->declarator)
8621 const cp_declarator *inner_declarator;
8624 if (type == error_mark_node)
8625 return error_mark_node;
8627 attrs = declarator->attributes;
8633 if (declarator == NULL || declarator->kind == cdk_id)
8634 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8635 if (declarator->kind == cdk_function)
8636 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8637 if (declarator->kind == cdk_array)
8638 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8639 returned_attrs = decl_attributes (&type,
8640 chainon (returned_attrs, attrs),
8644 if (declarator->kind == cdk_id)
8647 inner_declarator = declarator->declarator;
8649 switch (declarator->kind)
8652 type = create_array_type_for_decl (dname, type,
8653 declarator->u.array.bounds);
8661 /* Declaring a function type.
8662 Make sure we have a valid type for the function to return. */
8664 if (type_quals != TYPE_UNQUALIFIED)
8666 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8667 warning (OPT_Wignored_qualifiers,
8668 "type qualifiers ignored on function return type");
8669 /* We now know that the TYPE_QUALS don't apply to the
8670 decl, but to its return type. */
8671 type_quals = TYPE_UNQUALIFIED;
8673 errmsg = targetm.invalid_return_type (type);
8677 type = integer_type_node;
8680 /* Error about some types functions can't return. */
8682 if (TREE_CODE (type) == FUNCTION_TYPE)
8684 error ("%qs declared as function returning a function", name);
8685 return error_mark_node;
8687 if (TREE_CODE (type) == ARRAY_TYPE)
8689 error ("%qs declared as function returning an array", name);
8690 return error_mark_node;
8693 /* Pick up type qualifiers which should be applied to `this'. */
8694 memfn_quals = declarator->u.function.qualifiers;
8696 /* Pick up the exception specifications. */
8697 raises = declarator->u.function.exception_specification;
8699 /* Say it's a definition only for the CALL_EXPR
8700 closest to the identifier. */
8701 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8703 /* Handle a late-specified return type. */
8706 if (type_uses_auto (type))
8708 if (!declarator->u.function.late_return_type)
8710 error ("%qs function uses %<auto%> type specifier without"
8711 " late return type", name);
8712 return error_mark_node;
8714 else if (!is_auto (type))
8716 error ("%qs function with late return type has"
8717 " %qT as its type rather than plain %<auto%>",
8719 return error_mark_node;
8722 else if (declarator->u.function.late_return_type)
8724 error ("%qs function with late return type not declared"
8725 " with %<auto%> type specifier", name);
8726 return error_mark_node;
8729 type = splice_late_return_type
8730 (type, declarator->u.function.late_return_type);
8731 if (type == error_mark_node)
8732 return error_mark_node;
8734 if (ctype == NULL_TREE
8735 && decl_context == FIELD
8737 && (friendp == 0 || dname == current_class_name))
8738 ctype = current_class_type;
8740 if (ctype && (sfk == sfk_constructor
8741 || sfk == sfk_destructor))
8743 /* We are within a class's scope. If our declarator name
8744 is the same as the class name, and we are defining
8745 a function, then it is a constructor/destructor, and
8746 therefore returns a void type. */
8748 /* ISO C++ 12.4/2. A destructor may not be declared
8749 const or volatile. A destructor may not be
8752 ISO C++ 12.1. A constructor may not be declared
8753 const or volatile. A constructor may not be
8754 virtual. A constructor may not be static. */
8756 error ((flags == DTOR_FLAG)
8757 ? "destructor cannot be static member function"
8758 : "constructor cannot be static member function");
8761 error ((flags == DTOR_FLAG)
8762 ? "destructors may not be cv-qualified"
8763 : "constructors may not be cv-qualified");
8764 memfn_quals = TYPE_UNQUALIFIED;
8767 if (decl_context == FIELD
8768 && !member_function_or_else (ctype,
8771 return error_mark_node;
8773 if (flags != DTOR_FLAG)
8775 /* It's a constructor. */
8780 permerror (input_location, "constructors cannot be declared virtual");
8783 if (decl_context == FIELD
8784 && sfk != sfk_constructor)
8785 return error_mark_node;
8787 if (decl_context == FIELD)
8793 error ("can%'t initialize friend function %qs", name);
8796 /* Cannot be both friend and virtual. */
8797 error ("virtual functions cannot be friends");
8800 if (decl_context == NORMAL)
8801 error ("friend declaration not in class definition");
8802 if (current_function_decl && funcdef_flag)
8803 error ("can%'t define friend function %qs in a local "
8807 else if (ctype && sfk == sfk_conversion)
8811 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8816 arg_types = grokparms (declarator->u.function.parameters,
8819 if (inner_declarator
8820 && inner_declarator->kind == cdk_id
8821 && inner_declarator->u.id.sfk == sfk_destructor
8822 && arg_types != void_list_node)
8824 error ("destructors may not have parameters");
8825 arg_types = void_list_node;
8829 type = build_function_type (type, arg_types);
8836 /* Filter out pointers-to-references and references-to-references.
8837 We can get these if a TYPE_DECL is used. */
8839 if (TREE_CODE (type) == REFERENCE_TYPE)
8841 if (declarator->kind != cdk_reference)
8843 error ("cannot declare pointer to %q#T", type);
8844 type = TREE_TYPE (type);
8847 /* In C++0x, we allow reference to reference declarations
8848 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8849 and template type arguments [14.3.1/4 temp.arg.type]. The
8850 check for direct reference to reference declarations, which
8851 are still forbidden, occurs below. Reasoning behind the change
8852 can be found in DR106, DR540, and the rvalue reference
8854 else if (cxx_dialect == cxx98)
8856 error ("cannot declare reference to %q#T", type);
8857 type = TREE_TYPE (type);
8860 else if (VOID_TYPE_P (type))
8862 if (declarator->kind == cdk_reference)
8863 error ("cannot declare reference to %q#T", type);
8864 else if (declarator->kind == cdk_ptrmem)
8865 error ("cannot declare pointer to %q#T member", type);
8868 /* We now know that the TYPE_QUALS don't apply to the decl,
8869 but to the target of the pointer. */
8870 type_quals = TYPE_UNQUALIFIED;
8872 if (declarator->kind == cdk_ptrmem
8873 && (TREE_CODE (type) == FUNCTION_TYPE
8874 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8876 memfn_quals |= type_memfn_quals (type);
8877 type = build_memfn_type (type,
8878 declarator->u.pointer.class_type,
8880 if (type == error_mark_node)
8881 return error_mark_node;
8882 memfn_quals = TYPE_UNQUALIFIED;
8885 if (TREE_CODE (type) == FUNCTION_TYPE
8886 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8887 error (declarator->kind == cdk_reference
8888 ? G_("cannot declare reference to qualified function type %qT")
8889 : G_("cannot declare pointer to qualified function type %qT"),
8892 /* When the pointed-to type involves components of variable size,
8893 care must be taken to ensure that the size evaluation code is
8894 emitted early enough to dominate all the possible later uses
8895 and late enough for the variables on which it depends to have
8898 This is expected to happen automatically when the pointed-to
8899 type has a name/declaration of it's own, but special attention
8900 is required if the type is anonymous.
8902 We handle the NORMAL and FIELD contexts here by inserting a
8903 dummy statement that just evaluates the size at a safe point
8904 and ensures it is not deferred until e.g. within a deeper
8905 conditional context (c++/43555).
8907 We expect nothing to be needed here for PARM or TYPENAME.
8908 Evaluating the size at this point for TYPENAME would
8909 actually be incorrect, as we might be in the middle of an
8910 expression with side effects on the pointed-to type size
8911 "arguments" prior to the pointer declaration point and the
8912 size evaluation could end up prior to the side effects. */
8914 if (!TYPE_NAME (type)
8915 && (decl_context == NORMAL || decl_context == FIELD)
8916 && at_function_scope_p ()
8917 && variably_modified_type_p (type, NULL_TREE))
8918 finish_expr_stmt (TYPE_SIZE (type));
8920 if (declarator->kind == cdk_reference)
8922 /* In C++0x, the type we are creating a reference to might be
8923 a typedef which is itself a reference type. In that case,
8924 we follow the reference collapsing rules in
8925 [7.1.3/8 dcl.typedef] to create the final reference type:
8927 "If a typedef TD names a type that is a reference to a type
8928 T, an attempt to create the type 'lvalue reference to cv TD'
8929 creates the type 'lvalue reference to T,' while an attempt
8930 to create the type "rvalue reference to cv TD' creates the
8933 if (!VOID_TYPE_P (type))
8934 type = cp_build_reference_type
8935 ((TREE_CODE (type) == REFERENCE_TYPE
8936 ? TREE_TYPE (type) : type),
8937 (declarator->u.reference.rvalue_ref
8938 && (TREE_CODE(type) != REFERENCE_TYPE
8939 || TYPE_REF_IS_RVALUE (type))));
8941 /* In C++0x, we need this check for direct reference to
8942 reference declarations, which are forbidden by
8943 [8.3.2/5 dcl.ref]. Reference to reference declarations
8944 are only allowed indirectly through typedefs and template
8945 type arguments. Example:
8947 void foo(int & &); // invalid ref-to-ref decl
8949 typedef int & int_ref;
8950 void foo(int_ref &); // valid ref-to-ref decl
8952 if (inner_declarator && inner_declarator->kind == cdk_reference)
8953 error ("cannot declare reference to %q#T, which is not "
8954 "a typedef or a template type argument", type);
8956 else if (TREE_CODE (type) == METHOD_TYPE)
8957 type = build_ptrmemfunc_type (build_pointer_type (type));
8958 else if (declarator->kind == cdk_ptrmem)
8960 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8962 if (declarator->u.pointer.class_type == error_mark_node)
8963 /* We will already have complained. */
8964 type = error_mark_node;
8966 type = build_ptrmem_type (declarator->u.pointer.class_type,
8970 type = build_pointer_type (type);
8972 /* Process a list of type modifier keywords (such as
8973 const or volatile) that were given inside the `*' or `&'. */
8975 if (declarator->u.pointer.qualifiers)
8978 = cp_build_qualified_type (type,
8979 declarator->u.pointer.qualifiers);
8980 type_quals = cp_type_quals (type);
8993 /* A `constexpr' specifier used in an object declaration declares
8994 the object as `const'. */
8995 if (constexpr_p && innermost_code != cdk_function)
8997 if (type_quals & TYPE_QUAL_CONST)
8998 error ("both %<const%> and %<constexpr%> cannot be used here");
8999 if (type_quals & TYPE_QUAL_VOLATILE)
9000 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9001 type_quals |= TYPE_QUAL_CONST;
9002 type = cp_build_qualified_type (type, type_quals);
9005 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9006 && TREE_CODE (type) != FUNCTION_TYPE
9007 && TREE_CODE (type) != METHOD_TYPE)
9009 error ("template-id %qD used as a declarator",
9011 unqualified_id = dname;
9014 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9015 qualified with a class-name, turn it into a METHOD_TYPE, unless
9016 we know that the function is static. We take advantage of this
9017 opportunity to do other processing that pertains to entities
9018 explicitly declared to be class members. Note that if DECLARATOR
9019 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9020 would not have exited the loop above. */
9022 && declarator->u.id.qualifying_scope
9023 && TYPE_P (declarator->u.id.qualifying_scope))
9027 ctype = declarator->u.id.qualifying_scope;
9028 ctype = TYPE_MAIN_VARIANT (ctype);
9030 while (t != NULL_TREE && CLASS_TYPE_P (t))
9032 /* You're supposed to have one `template <...>' for every
9033 template class, but you don't need one for a full
9034 specialization. For example:
9036 template <class T> struct S{};
9037 template <> struct S<int> { void f(); };
9038 void S<int>::f () {}
9040 is correct; there shouldn't be a `template <>' for the
9041 definition of `S<int>::f'. */
9042 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9043 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9044 /* T is an explicit (not partial) specialization. All
9045 containing classes must therefore also be explicitly
9048 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9049 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9050 template_count += 1;
9052 t = TYPE_MAIN_DECL (t);
9053 t = DECL_CONTEXT (t);
9056 if (ctype == current_class_type)
9060 permerror (input_location, "member functions are implicitly friends of their class");
9064 permerror (declarator->id_loc,
9065 "extra qualification %<%T::%> on member %qs",
9068 else if (/* If the qualifying type is already complete, then we
9069 can skip the following checks. */
9070 !COMPLETE_TYPE_P (ctype)
9071 && (/* If the function is being defined, then
9072 qualifying type must certainly be complete. */
9074 /* A friend declaration of "T::f" is OK, even if
9075 "T" is a template parameter. But, if this
9076 function is not a friend, the qualifying type
9078 || (!friendp && !CLASS_TYPE_P (ctype))
9079 /* For a declaration, the type need not be
9080 complete, if either it is dependent (since there
9081 is no meaningful definition of complete in that
9082 case) or the qualifying class is currently being
9084 || !(dependent_type_p (ctype)
9085 || currently_open_class (ctype)))
9086 /* Check that the qualifying type is complete. */
9087 && !complete_type_or_else (ctype, NULL_TREE))
9088 return error_mark_node;
9089 else if (TREE_CODE (type) == FUNCTION_TYPE)
9091 if (current_class_type
9092 && (!friendp || funcdef_flag))
9095 ? "cannot define member function %<%T::%s%> within %<%T%>"
9096 : "cannot declare member function %<%T::%s%> within %<%T%>",
9097 ctype, name, current_class_type);
9098 return error_mark_node;
9101 else if (declspecs->specs[(int)ds_typedef]
9102 && current_class_type)
9104 error ("cannot declare member %<%T::%s%> within %qT",
9105 ctype, name, current_class_type);
9106 return error_mark_node;
9110 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9111 ctype = current_class_type;
9113 /* A constexpr non-static member function is implicitly const. */
9114 if (constexpr_p && ctype && staticp == 0
9115 && TREE_CODE (type) == FUNCTION_TYPE
9116 && sfk != sfk_constructor && sfk != sfk_destructor)
9117 memfn_quals |= TYPE_QUAL_CONST;
9119 /* Now TYPE has the actual type. */
9124 *attrlist = chainon (returned_attrs, *attrlist);
9126 attrlist = &returned_attrs;
9129 /* Handle parameter packs. */
9130 if (parameter_pack_p)
9132 if (decl_context == PARM)
9133 /* Turn the type into a pack expansion.*/
9134 type = make_pack_expansion (type);
9136 error ("non-parameter %qs cannot be a parameter pack", name);
9139 /* Did array size calculations overflow? */
9141 if (TREE_CODE (type) == ARRAY_TYPE
9142 && COMPLETE_TYPE_P (type)
9143 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9144 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9146 error ("size of array %qs is too large", name);
9147 /* If we proceed with the array type as it is, we'll eventually
9148 crash in tree_low_cst(). */
9149 type = error_mark_node;
9152 if ((decl_context == FIELD || decl_context == PARM)
9153 && !processing_template_decl
9154 && variably_modified_type_p (type, NULL_TREE))
9156 if (decl_context == FIELD)
9157 error ("data member may not have variably modified type %qT", type);
9159 error ("parameter may not have variably modified type %qT", type);
9160 type = error_mark_node;
9163 if (explicitp == 1 || (explicitp && friendp))
9165 /* [dcl.fct.spec] The explicit specifier shall only be used in
9166 declarations of constructors within a class definition. */
9167 error ("only declarations of constructors can be %<explicit%>");
9171 if (storage_class == sc_mutable)
9173 if (decl_context != FIELD || friendp)
9175 error ("non-member %qs cannot be declared %<mutable%>", name);
9176 storage_class = sc_none;
9178 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9180 error ("non-object member %qs cannot be declared %<mutable%>", name);
9181 storage_class = sc_none;
9183 else if (TREE_CODE (type) == FUNCTION_TYPE
9184 || TREE_CODE (type) == METHOD_TYPE)
9186 error ("function %qs cannot be declared %<mutable%>", name);
9187 storage_class = sc_none;
9191 error ("static %qs cannot be declared %<mutable%>", name);
9192 storage_class = sc_none;
9194 else if (type_quals & TYPE_QUAL_CONST)
9196 error ("const %qs cannot be declared %<mutable%>", name);
9197 storage_class = sc_none;
9201 /* If this is declaring a typedef name, return a TYPE_DECL. */
9202 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9206 /* Note that the grammar rejects storage classes
9207 in typenames, fields or parameters. */
9208 if (current_lang_name == lang_name_java)
9209 TYPE_FOR_JAVA (type) = 1;
9211 /* This declaration:
9213 typedef void f(int) const;
9215 declares a function type which is not a member of any
9216 particular class, but which is cv-qualified; for
9217 example "f S::*" declares a pointer to a const-qualified
9218 member function of S. We record the cv-qualification in the
9220 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9222 type = apply_memfn_quals (type, memfn_quals);
9224 /* We have now dealt with these qualifiers. */
9225 memfn_quals = TYPE_UNQUALIFIED;
9228 if (decl_context == FIELD)
9229 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9231 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9232 if (id_declarator && declarator->u.id.qualifying_scope) {
9233 error_at (DECL_SOURCE_LOCATION (decl),
9234 "typedef name may not be a nested-name-specifier");
9235 TREE_TYPE (decl) = error_mark_node;
9238 if (decl_context != FIELD)
9240 if (!current_function_decl)
9241 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9242 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9243 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9244 (current_function_decl)))
9245 /* The TYPE_DECL is "abstract" because there will be
9246 clones of this constructor/destructor, and there will
9247 be copies of this TYPE_DECL generated in those
9249 DECL_ABSTRACT (decl) = 1;
9251 else if (constructor_name_p (unqualified_id, current_class_type))
9252 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9253 "as enclosing class",
9256 /* If the user declares "typedef struct {...} foo" then the
9257 struct will have an anonymous name. Fill that name in now.
9258 Nothing can refer to it, so nothing needs know about the name
9260 if (type != error_mark_node
9263 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9264 && TYPE_ANONYMOUS_P (type)
9265 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9269 /* Replace the anonymous name with the real name everywhere. */
9270 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9272 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9273 /* We do not rename the debug info representing the
9274 anonymous tagged type because the standard says in
9275 [dcl.typedef] that the naming applies only for
9276 linkage purposes. */
9277 /*debug_hooks->set_name (t, decl);*/
9278 TYPE_NAME (t) = decl;
9281 if (TYPE_LANG_SPECIFIC (type))
9282 TYPE_WAS_ANONYMOUS (type) = 1;
9284 /* If this is a typedef within a template class, the nested
9285 type is a (non-primary) template. The name for the
9286 template needs updating as well. */
9287 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9288 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9289 = TYPE_IDENTIFIER (type);
9291 /* Adjust linkage now that we aren't anonymous anymore. */
9292 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9293 determine_visibility (TYPE_MAIN_DECL (type));
9295 /* FIXME remangle member functions; member functions of a
9296 type with external linkage have external linkage. */
9300 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9301 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9303 bad_specifiers (decl, BSP_TYPE, virtualp,
9304 memfn_quals != TYPE_UNQUALIFIED,
9305 inlinep, friendp, raises != NULL_TREE);
9310 /* Detect the case of an array type of unspecified size
9311 which came, as such, direct from a typedef name.
9312 We must copy the type, so that the array's domain can be
9313 individually set by the object's initializer. */
9315 if (type && typedef_type
9316 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9317 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9318 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9320 /* Detect where we're using a typedef of function type to declare a
9321 function. PARMS will not be set, so we must create it now. */
9323 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9325 tree decls = NULL_TREE;
9328 for (args = TYPE_ARG_TYPES (type);
9329 args && args != void_list_node;
9330 args = TREE_CHAIN (args))
9332 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9334 DECL_CHAIN (decl) = decls;
9338 parms = nreverse (decls);
9340 if (decl_context != TYPENAME)
9342 /* A cv-qualifier-seq shall only be part of the function type
9343 for a non-static member function. [8.3.5/4 dcl.fct] */
9344 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9345 && (current_class_type == NULL_TREE || staticp) )
9348 ? G_("qualified function types cannot be used to "
9349 "declare static member functions")
9350 : G_("qualified function types cannot be used to "
9351 "declare free functions"));
9352 type = TYPE_MAIN_VARIANT (type);
9355 /* The qualifiers on the function type become the qualifiers on
9356 the non-static member function. */
9357 memfn_quals |= type_memfn_quals (type);
9358 type_quals = TYPE_UNQUALIFIED;
9362 /* If this is a type name (such as, in a cast or sizeof),
9363 compute the type and return it now. */
9365 if (decl_context == TYPENAME)
9367 /* Note that the grammar rejects storage classes
9368 in typenames, fields or parameters. */
9369 if (type_quals != TYPE_UNQUALIFIED)
9370 type_quals = TYPE_UNQUALIFIED;
9372 /* Special case: "friend class foo" looks like a TYPENAME context. */
9375 if (type_quals != TYPE_UNQUALIFIED)
9377 error ("type qualifiers specified for friend class declaration");
9378 type_quals = TYPE_UNQUALIFIED;
9382 error ("%<inline%> specified for friend class declaration");
9388 /* Don't allow friend declaration without a class-key. */
9389 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9390 permerror (input_location, "template parameters cannot be friends");
9391 else if (TREE_CODE (type) == TYPENAME_TYPE)
9392 permerror (input_location, "friend declaration requires class-key, "
9393 "i.e. %<friend class %T::%D%>",
9394 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9396 permerror (input_location, "friend declaration requires class-key, "
9397 "i.e. %<friend %#T%>",
9401 /* Only try to do this stuff if we didn't already give up. */
9402 if (type != integer_type_node)
9404 /* A friendly class? */
9405 if (current_class_type)
9406 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9409 error ("trying to make class %qT a friend of global scope",
9412 type = void_type_node;
9415 else if (memfn_quals)
9417 if (ctype == NULL_TREE
9418 && TREE_CODE (type) == METHOD_TYPE)
9419 ctype = TYPE_METHOD_BASETYPE (type);
9422 type = build_memfn_type (type, ctype, memfn_quals);
9423 /* Core issue #547: need to allow this in template type args. */
9424 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9425 type = apply_memfn_quals (type, memfn_quals);
9427 error ("invalid qualifiers on non-member function type");
9432 else if (unqualified_id == NULL_TREE && decl_context != PARM
9433 && decl_context != CATCHPARM
9434 && TREE_CODE (type) != UNION_TYPE
9437 error ("abstract declarator %qT used as declaration", type);
9438 return error_mark_node;
9441 /* Only functions may be declared using an operator-function-id. */
9443 && IDENTIFIER_OPNAME_P (unqualified_id)
9444 && TREE_CODE (type) != FUNCTION_TYPE
9445 && TREE_CODE (type) != METHOD_TYPE)
9447 error ("declaration of %qD as non-function", unqualified_id);
9448 return error_mark_node;
9451 /* We don't check parameter types here because we can emit a better
9452 error message later. */
9453 if (decl_context != PARM)
9455 type = check_var_type (unqualified_id, type);
9456 if (type == error_mark_node)
9457 return error_mark_node;
9460 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9461 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9463 if (decl_context == PARM || decl_context == CATCHPARM)
9465 if (ctype || in_namespace)
9466 error ("cannot use %<::%> in parameter declaration");
9468 /* A parameter declared as an array of T is really a pointer to T.
9469 One declared as a function is really a pointer to a function.
9470 One declared as a member is really a pointer to member. */
9472 if (TREE_CODE (type) == ARRAY_TYPE)
9474 /* Transfer const-ness of array into that of type pointed to. */
9475 type = build_pointer_type (TREE_TYPE (type));
9476 type_quals = TYPE_UNQUALIFIED;
9478 else if (TREE_CODE (type) == FUNCTION_TYPE)
9479 type = build_pointer_type (type);
9482 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9483 && !NEW_DELETE_OPNAME_P (unqualified_id))
9484 type = build_memfn_type (type, ctype, memfn_quals);
9489 if (decl_context == PARM)
9491 decl = cp_build_parm_decl (unqualified_id, type);
9493 bad_specifiers (decl, BSP_PARM, virtualp,
9494 memfn_quals != TYPE_UNQUALIFIED,
9495 inlinep, friendp, raises != NULL_TREE);
9497 else if (decl_context == FIELD)
9499 /* The C99 flexible array extension. */
9500 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9501 && TYPE_DOMAIN (type) == NULL_TREE)
9503 tree itype = compute_array_index_type (dname, integer_zero_node,
9504 tf_warning_or_error);
9505 type = build_cplus_array_type (TREE_TYPE (type), itype);
9508 if (type == error_mark_node)
9510 /* Happens when declaring arrays of sizes which
9511 are error_mark_node, for example. */
9514 else if (in_namespace && !friendp)
9516 /* Something like struct S { int N::j; }; */
9517 error ("invalid use of %<::%>");
9518 return error_mark_node;
9520 else if (TREE_CODE (type) == FUNCTION_TYPE
9521 || TREE_CODE (type) == METHOD_TYPE)
9524 tree function_context;
9530 /* ``A union may [ ... ] not [ have ] virtual functions.''
9532 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9534 error ("function %qD declared virtual inside a union",
9536 return error_mark_node;
9539 if (NEW_DELETE_OPNAME_P (unqualified_id))
9543 error ("%qD cannot be declared virtual, since it "
9551 /* Check that the name used for a destructor makes sense. */
9552 if (sfk == sfk_destructor)
9554 tree uqname = id_declarator->u.id.unqualified_name;
9558 gcc_assert (friendp);
9559 error ("expected qualified name in friend declaration "
9560 "for destructor %qD", uqname);
9561 return error_mark_node;
9564 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9566 error ("declaration of %qD as member of %qT",
9568 return error_mark_node;
9572 error ("a destructor cannot be %<constexpr%>");
9573 return error_mark_node;
9576 else if (sfk == sfk_constructor && friendp && !ctype)
9578 error ("expected qualified name in friend declaration "
9579 "for constructor %qD",
9580 id_declarator->u.id.unqualified_name);
9581 return error_mark_node;
9584 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9585 function_context = (ctype != NULL_TREE) ?
9586 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9587 publicp = (! friendp || ! staticp)
9588 && function_context == NULL_TREE;
9589 decl = grokfndecl (ctype, type,
9590 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9591 ? unqualified_id : dname,
9594 virtualp, flags, memfn_quals, raises,
9595 friendp ? -1 : 0, friendp, publicp,
9596 inlinep | (2 * constexpr_p),
9598 funcdef_flag, template_count, in_namespace,
9599 attrlist, declarator->id_loc);
9600 if (decl == NULL_TREE)
9601 return error_mark_node;
9603 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9604 /* The decl and setting of decl_attr is also turned off. */
9605 decl = build_decl_attribute_variant (decl, decl_attr);
9608 /* [class.conv.ctor]
9610 A constructor declared without the function-specifier
9611 explicit that can be called with a single parameter
9612 specifies a conversion from the type of its first
9613 parameter to the type of its class. Such a constructor
9614 is called a converting constructor. */
9616 DECL_NONCONVERTING_P (decl) = 1;
9618 else if (!staticp && !dependent_type_p (type)
9619 && !COMPLETE_TYPE_P (complete_type (type))
9620 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9623 error ("field %qD has incomplete type", unqualified_id);
9625 error ("name %qT has incomplete type", type);
9627 /* If we're instantiating a template, tell them which
9628 instantiation made the field's type be incomplete. */
9629 if (current_class_type
9630 && TYPE_NAME (current_class_type)
9631 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9633 && declspecs->type == type)
9634 error (" in instantiation of template %qT",
9635 current_class_type);
9637 return error_mark_node;
9643 error ("%qE is neither function nor member function; "
9644 "cannot be declared friend", unqualified_id);
9652 /* Friends are treated specially. */
9653 if (ctype == current_class_type)
9654 ; /* We already issued a permerror. */
9655 else if (decl && DECL_NAME (decl))
9657 if (template_class_depth (current_class_type) == 0)
9659 decl = check_explicit_specialization
9660 (unqualified_id, decl, template_count,
9661 2 * funcdef_flag + 4);
9662 if (decl == error_mark_node)
9663 return error_mark_node;
9666 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9667 decl = do_friend (ctype, unqualified_id, decl,
9673 return error_mark_node;
9676 /* Structure field. It may not be a function, except for C++. */
9678 if (decl == NULL_TREE)
9684 /* An attempt is being made to initialize a non-static
9685 member. But, from [class.mem]:
9687 4 A member-declarator can contain a
9688 constant-initializer only if it declares a static
9689 member (_class.static_) of integral or enumeration
9690 type, see _class.static.data_.
9692 This used to be relatively common practice, but
9693 the rest of the compiler does not correctly
9694 handle the initialization unless the member is
9695 static so we make it static below. */
9696 if (cxx_dialect >= cxx0x)
9698 sorry ("non-static data member initializers");
9702 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9704 permerror (input_location, "making %qD static", unqualified_id);
9709 if (uses_template_parms (type))
9710 /* We'll check at instantiation time. */
9712 else if (constexpr_p)
9713 /* constexpr has the same requirements. */
9715 else if (check_static_variable_definition (unqualified_id,
9717 /* If we just return the declaration, crashes
9718 will sometimes occur. We therefore return
9719 void_type_node, as if this was a friend
9720 declaration, to cause callers to completely
9721 ignore this declaration. */
9722 return error_mark_node;
9727 /* C++ allows static class members. All other work
9728 for this is done by grokfield. */
9729 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9730 set_linkage_for_static_data_member (decl);
9731 /* Even if there is an in-class initialization, DECL
9732 is considered undefined until an out-of-class
9733 definition is provided. */
9734 DECL_EXTERNAL (decl) = 1;
9737 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9743 error ("non-static data member %qE declared %<constexpr%>",
9745 constexpr_p = false;
9747 decl = build_decl (input_location,
9748 FIELD_DECL, unqualified_id, type);
9749 DECL_NONADDRESSABLE_P (decl) = bitfield;
9750 if (bitfield && !unqualified_id)
9751 TREE_NO_WARNING (decl) = 1;
9753 if (storage_class == sc_mutable)
9755 DECL_MUTABLE_P (decl) = 1;
9756 storage_class = sc_none;
9760 bad_specifiers (decl, BSP_FIELD, virtualp,
9761 memfn_quals != TYPE_UNQUALIFIED,
9762 inlinep, friendp, raises != NULL_TREE);
9765 else if (TREE_CODE (type) == FUNCTION_TYPE
9766 || TREE_CODE (type) == METHOD_TYPE)
9771 if (!unqualified_id)
9772 return error_mark_node;
9774 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9775 original_name = dname;
9777 original_name = unqualified_id;
9779 if (storage_class == sc_auto)
9780 error ("storage class %<auto%> invalid for function %qs", name);
9781 else if (storage_class == sc_register)
9782 error ("storage class %<register%> invalid for function %qs", name);
9784 error ("storage class %<__thread%> invalid for function %qs", name);
9786 /* Function declaration not at top level.
9787 Storage classes other than `extern' are not allowed
9788 and `extern' makes no difference. */
9789 if (! toplevel_bindings_p ()
9790 && (storage_class == sc_static
9791 || declspecs->specs[(int)ds_inline])
9794 if (storage_class == sc_static)
9795 pedwarn (input_location, OPT_pedantic,
9796 "%<static%> specified invalid for function %qs "
9797 "declared out of global scope", name);
9799 pedwarn (input_location, OPT_pedantic,
9800 "%<inline%> specifier invalid for function %qs "
9801 "declared out of global scope", name);
9804 if (ctype != NULL_TREE
9805 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9807 error ("%q#T is not a class or a namespace", ctype);
9811 if (ctype == NULL_TREE)
9815 error ("virtual non-class function %qs", name);
9818 else if (sfk == sfk_constructor
9819 || sfk == sfk_destructor)
9822 ? "%qs defined in a non-class scope"
9823 : "%qs declared in a non-class scope", name);
9828 /* Record presence of `static'. */
9829 publicp = (ctype != NULL_TREE
9830 || storage_class == sc_extern
9831 || storage_class != sc_static);
9833 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9834 virtualp, flags, memfn_quals, raises,
9836 publicp, inlinep | (2 * constexpr_p), sfk,
9838 template_count, in_namespace, attrlist,
9839 declarator->id_loc);
9840 if (decl == NULL_TREE)
9841 return error_mark_node;
9845 int invalid_static = 0;
9847 /* Don't allow a static member function in a class, and forbid
9848 declaring main to be static. */
9849 if (TREE_CODE (type) == METHOD_TYPE)
9851 permerror (input_location, "cannot declare member function %qD to have "
9852 "static linkage", decl);
9855 else if (current_function_decl)
9857 /* FIXME need arm citation */
9858 error ("cannot declare static function inside another function");
9865 storage_class = sc_none;
9871 /* It's a variable. */
9873 /* An uninitialized decl with `extern' is a reference. */
9874 decl = grokvardecl (type, unqualified_id,
9877 (type_quals & TYPE_QUAL_CONST) != 0,
9878 ctype ? ctype : in_namespace);
9879 bad_specifiers (decl, BSP_VAR, virtualp,
9880 memfn_quals != TYPE_UNQUALIFIED,
9881 inlinep, friendp, raises != NULL_TREE);
9885 DECL_CONTEXT (decl) = ctype;
9888 permerror (input_location, "%<static%> may not be used when defining "
9889 "(as opposed to declaring) a static data member");
9891 storage_class = sc_none;
9893 if (storage_class == sc_register && TREE_STATIC (decl))
9895 error ("static member %qD declared %<register%>", decl);
9896 storage_class = sc_none;
9898 if (storage_class == sc_extern && pedantic)
9900 pedwarn (input_location, OPT_pedantic,
9901 "cannot explicitly declare member %q#D to have "
9902 "extern linkage", decl);
9903 storage_class = sc_none;
9906 else if (constexpr_p && DECL_EXTERNAL (decl))
9907 error ("declaration of constexpr variable %qD is not a definition",
9911 if (storage_class == sc_extern && initialized && !funcdef_flag)
9913 if (toplevel_bindings_p ())
9915 /* It's common practice (and completely valid) to have a const
9916 be initialized and declared extern. */
9917 if (!(type_quals & TYPE_QUAL_CONST))
9918 warning (0, "%qs initialized and declared %<extern%>", name);
9922 error ("%qs has both %<extern%> and initializer", name);
9923 return error_mark_node;
9927 /* Record `register' declaration for warnings on &
9928 and in case doing stupid register allocation. */
9930 if (storage_class == sc_register)
9931 DECL_REGISTER (decl) = 1;
9932 else if (storage_class == sc_extern)
9933 DECL_THIS_EXTERN (decl) = 1;
9934 else if (storage_class == sc_static)
9935 DECL_THIS_STATIC (decl) = 1;
9937 /* Don't forget constexprness. */
9939 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9941 /* Record constancy and volatility on the DECL itself . There's
9942 no need to do this when processing a template; we'll do this
9943 for the instantiated declaration based on the type of DECL. */
9944 if (!processing_template_decl)
9945 cp_apply_type_quals_to_decl (type_quals, decl);
9951 /* Subroutine of start_function. Ensure that each of the parameter
9952 types (as listed in PARMS) is complete, as is required for a
9953 function definition. */
9956 require_complete_types_for_parms (tree parms)
9958 for (; parms; parms = DECL_CHAIN (parms))
9960 if (dependent_type_p (TREE_TYPE (parms)))
9962 if (!VOID_TYPE_P (TREE_TYPE (parms))
9963 && complete_type_or_else (TREE_TYPE (parms), parms))
9965 relayout_decl (parms);
9966 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9969 /* grokparms or complete_type_or_else will have already issued
9971 TREE_TYPE (parms) = error_mark_node;
9975 /* Returns nonzero if T is a local variable. */
9978 local_variable_p (const_tree t)
9980 if ((TREE_CODE (t) == VAR_DECL
9981 /* A VAR_DECL with a context that is a _TYPE is a static data
9983 && !TYPE_P (CP_DECL_CONTEXT (t))
9984 /* Any other non-local variable must be at namespace scope. */
9985 && !DECL_NAMESPACE_SCOPE_P (t))
9986 || (TREE_CODE (t) == PARM_DECL))
9992 /* Like local_variable_p, but suitable for use as a tree-walking
9996 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9997 void *data ATTRIBUTE_UNUSED)
9999 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10001 else if (TYPE_P (*tp))
10002 *walk_subtrees = 0;
10008 /* Check that ARG, which is a default-argument expression for a
10009 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10010 something goes wrong. DECL may also be a _TYPE node, rather than a
10011 DECL, if there is no DECL available. */
10014 check_default_argument (tree decl, tree arg)
10019 if (TREE_CODE (arg) == DEFAULT_ARG)
10020 /* We get a DEFAULT_ARG when looking at an in-class declaration
10021 with a default argument. Ignore the argument for now; we'll
10022 deal with it after the class is complete. */
10031 decl_type = TREE_TYPE (decl);
10033 if (arg == error_mark_node
10034 || decl == error_mark_node
10035 || TREE_TYPE (arg) == error_mark_node
10036 || decl_type == error_mark_node)
10037 /* Something already went wrong. There's no need to check
10039 return error_mark_node;
10041 /* [dcl.fct.default]
10043 A default argument expression is implicitly converted to the
10045 if (!TREE_TYPE (arg)
10046 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10049 error ("default argument for %q#D has type %qT",
10050 decl, TREE_TYPE (arg));
10052 error ("default argument for parameter of type %qT has type %qT",
10053 decl_type, TREE_TYPE (arg));
10055 return error_mark_node;
10058 /* [dcl.fct.default]
10060 Local variables shall not be used in default argument
10063 The keyword `this' shall not be used in a default argument of a
10064 member function. */
10065 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10068 error ("default argument %qE uses local variable %qD", arg, var);
10069 return error_mark_node;
10076 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10079 type_is_deprecated (tree type)
10081 enum tree_code code;
10082 if (TREE_DEPRECATED (type))
10084 if (TYPE_NAME (type)
10085 && TREE_DEPRECATED (TYPE_NAME (type)))
10088 /* Do warn about using typedefs to a deprecated class. */
10089 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10090 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10092 code = TREE_CODE (type);
10094 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10095 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10096 || code == METHOD_TYPE || code == ARRAY_TYPE)
10097 return type_is_deprecated (TREE_TYPE (type));
10099 if (TYPE_PTRMEMFUNC_P (type))
10100 return type_is_deprecated
10101 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10106 /* Decode the list of parameter types for a function type.
10107 Given the list of things declared inside the parens,
10108 return a list of types.
10110 If this parameter does not end with an ellipsis, we append
10113 *PARMS is set to the chain of PARM_DECLs created. */
10116 grokparms (tree parmlist, tree *parms)
10118 tree result = NULL_TREE;
10119 tree decls = NULL_TREE;
10123 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10125 tree type = NULL_TREE;
10126 tree init = TREE_PURPOSE (parm);
10127 tree decl = TREE_VALUE (parm);
10128 const char *errmsg;
10130 if (parm == void_list_node)
10133 if (! decl || TREE_TYPE (decl) == error_mark_node)
10136 type = TREE_TYPE (decl);
10137 if (VOID_TYPE_P (type))
10139 if (same_type_p (type, void_type_node)
10140 && DECL_SELF_REFERENCE_P (type)
10141 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10142 /* this is a parmlist of `(void)', which is ok. */
10144 cxx_incomplete_type_error (decl, type);
10145 /* It's not a good idea to actually create parameters of
10146 type `void'; other parts of the compiler assume that a
10147 void type terminates the parameter list. */
10148 type = error_mark_node;
10149 TREE_TYPE (decl) = error_mark_node;
10152 if (type != error_mark_node
10153 && TYPE_FOR_JAVA (type)
10154 && MAYBE_CLASS_TYPE_P (type))
10156 error ("parameter %qD has Java class type", decl);
10157 type = error_mark_node;
10158 TREE_TYPE (decl) = error_mark_node;
10162 if (type != error_mark_node
10163 && (errmsg = targetm.invalid_parameter_type (type)))
10166 type = error_mark_node;
10167 TREE_TYPE (decl) = error_mark_node;
10170 if (type != error_mark_node)
10172 if (deprecated_state != DEPRECATED_SUPPRESS)
10174 tree deptype = type_is_deprecated (type);
10176 warn_deprecated_use (deptype, NULL_TREE);
10179 /* Top-level qualifiers on the parameters are
10180 ignored for function types. */
10181 type = cp_build_qualified_type (type, 0);
10182 if (TREE_CODE (type) == METHOD_TYPE)
10184 error ("parameter %qD invalidly declared method type", decl);
10185 type = build_pointer_type (type);
10186 TREE_TYPE (decl) = type;
10188 else if (abstract_virtuals_error (decl, type))
10189 any_error = 1; /* Seems like a good idea. */
10190 else if (POINTER_TYPE_P (type))
10192 /* [dcl.fct]/6, parameter types cannot contain pointers
10193 (references) to arrays of unknown bound. */
10194 tree t = TREE_TYPE (type);
10195 int ptr = TYPE_PTR_P (type);
10199 if (TYPE_PTR_P (t))
10201 else if (TREE_CODE (t) != ARRAY_TYPE)
10203 else if (!TYPE_DOMAIN (t))
10207 if (TREE_CODE (t) == ARRAY_TYPE)
10209 ? G_("parameter %qD includes pointer to array of "
10210 "unknown bound %qT")
10211 : G_("parameter %qD includes reference to array of "
10212 "unknown bound %qT"),
10218 else if (init && !processing_template_decl)
10219 init = check_default_argument (decl, init);
10222 if (TREE_CODE (decl) == PARM_DECL
10223 && FUNCTION_PARAMETER_PACK_P (decl)
10224 && TREE_CHAIN (parm)
10225 && TREE_CHAIN (parm) != void_list_node)
10226 error ("parameter packs must be at the end of the parameter list");
10228 DECL_CHAIN (decl) = decls;
10230 result = tree_cons (init, type, result);
10232 decls = nreverse (decls);
10233 result = nreverse (result);
10235 result = chainon (result, void_list_node);
10242 /* D is a constructor or overloaded `operator='.
10244 Let T be the class in which D is declared. Then, this function
10247 -1 if D's is an ill-formed constructor or copy assignment operator
10248 whose first parameter is of type `T'.
10249 0 if D is not a copy constructor or copy assignment
10251 1 if D is a copy constructor or copy assignment operator whose
10252 first parameter is a reference to non-const qualified T.
10253 2 if D is a copy constructor or copy assignment operator whose
10254 first parameter is a reference to const qualified T.
10256 This function can be used as a predicate. Positive values indicate
10257 a copy constructor and nonzero values indicate a copy assignment
10261 copy_fn_p (const_tree d)
10267 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10269 if (TREE_CODE (d) == TEMPLATE_DECL
10270 || (DECL_TEMPLATE_INFO (d)
10271 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10272 /* Instantiations of template member functions are never copy
10273 functions. Note that member functions of templated classes are
10274 represented as template functions internally, and we must
10275 accept those as copy functions. */
10278 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10282 arg_type = TREE_VALUE (args);
10283 if (arg_type == error_mark_node)
10286 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10288 /* Pass by value copy assignment operator. */
10291 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10292 && !TYPE_REF_IS_RVALUE (arg_type)
10293 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10295 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10301 args = TREE_CHAIN (args);
10303 if (args && args != void_list_node && !TREE_PURPOSE (args))
10304 /* There are more non-optional args. */
10310 /* D is a constructor or overloaded `operator='.
10312 Let T be the class in which D is declared. Then, this function
10313 returns true when D is a move constructor or move assignment
10314 operator, false otherwise. */
10317 move_fn_p (const_tree d)
10321 bool result = false;
10323 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10325 if (cxx_dialect == cxx98)
10326 /* There are no move constructors if we are in C++98 mode. */
10329 if (TREE_CODE (d) == TEMPLATE_DECL
10330 || (DECL_TEMPLATE_INFO (d)
10331 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10332 /* Instantiations of template member functions are never copy
10333 functions. Note that member functions of templated classes are
10334 represented as template functions internally, and we must
10335 accept those as copy functions. */
10338 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10342 arg_type = TREE_VALUE (args);
10343 if (arg_type == error_mark_node)
10346 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10347 && TYPE_REF_IS_RVALUE (arg_type)
10348 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10352 args = TREE_CHAIN (args);
10354 if (args && args != void_list_node && !TREE_PURPOSE (args))
10355 /* There are more non-optional args. */
10361 /* Remember any special properties of member function DECL. */
10364 grok_special_member_properties (tree decl)
10368 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10371 class_type = DECL_CONTEXT (decl);
10372 if (DECL_CONSTRUCTOR_P (decl))
10374 int ctor = copy_fn_p (decl);
10376 if (!DECL_ARTIFICIAL (decl))
10377 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10383 A non-template constructor for class X is a copy
10384 constructor if its first parameter is of type X&, const
10385 X&, volatile X& or const volatile X&, and either there
10386 are no other parameters or else all other parameters have
10387 default arguments. */
10388 TYPE_HAS_COPY_CTOR (class_type) = 1;
10389 if (user_provided_p (decl))
10390 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10392 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10394 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10396 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10397 if (user_provided_p (decl))
10398 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10400 else if (move_fn_p (decl) && user_provided_p (decl))
10401 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10402 else if (is_list_ctor (decl))
10403 TYPE_HAS_LIST_CTOR (class_type) = 1;
10405 if (DECL_DECLARED_CONSTEXPR_P (decl)
10406 && !copy_fn_p (decl) && !move_fn_p (decl))
10407 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10409 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10413 A non-template assignment operator for class X is a copy
10414 assignment operator if its parameter is of type X, X&, const
10415 X&, volatile X& or const volatile X&. */
10417 int assop = copy_fn_p (decl);
10421 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10422 if (user_provided_p (decl))
10423 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10425 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10427 else if (move_fn_p (decl) && user_provided_p (decl))
10428 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10430 /* Destructors are handled in check_methods. */
10433 /* Check a constructor DECL has the correct form. Complains
10434 if the class has a constructor of the form X(X). */
10437 grok_ctor_properties (const_tree ctype, const_tree decl)
10439 int ctor_parm = copy_fn_p (decl);
10445 A declaration of a constructor for a class X is ill-formed if
10446 its first parameter is of type (optionally cv-qualified) X
10447 and either there are no other parameters or else all other
10448 parameters have default arguments.
10450 We *don't* complain about member template instantiations that
10451 have this form, though; they can occur as we try to decide
10452 what constructor to use during overload resolution. Since
10453 overload resolution will never prefer such a constructor to
10454 the non-template copy constructor (which is either explicitly
10455 or implicitly defined), there's no need to worry about their
10456 existence. Theoretically, they should never even be
10457 instantiated, but that's hard to forestall. */
10458 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10466 /* An operator with this code is unary, but can also be binary. */
10469 ambi_op_p (enum tree_code code)
10471 return (code == INDIRECT_REF
10472 || code == ADDR_EXPR
10473 || code == UNARY_PLUS_EXPR
10474 || code == NEGATE_EXPR
10475 || code == PREINCREMENT_EXPR
10476 || code == PREDECREMENT_EXPR);
10479 /* An operator with this name can only be unary. */
10482 unary_op_p (enum tree_code code)
10484 return (code == TRUTH_NOT_EXPR
10485 || code == BIT_NOT_EXPR
10486 || code == COMPONENT_REF
10487 || code == TYPE_EXPR);
10490 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10491 errors are issued for invalid declarations. */
10494 grok_op_properties (tree decl, bool complain)
10496 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10498 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10499 tree name = DECL_NAME (decl);
10500 enum tree_code operator_code;
10505 /* Count the number of arguments and check for ellipsis. */
10506 for (argtype = argtypes, arity = 0;
10507 argtype && argtype != void_list_node;
10508 argtype = TREE_CHAIN (argtype))
10510 ellipsis_p = !argtype;
10512 class_type = DECL_CONTEXT (decl);
10513 if (class_type && !CLASS_TYPE_P (class_type))
10514 class_type = NULL_TREE;
10516 if (DECL_CONV_FN_P (decl))
10517 operator_code = TYPE_EXPR;
10521 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10522 if (ansi_opname (CODE) == name) \
10524 operator_code = (CODE); \
10527 else if (ansi_assopname (CODE) == name) \
10529 operator_code = (CODE); \
10530 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10534 #include "operators.def"
10535 #undef DEF_OPERATOR
10537 gcc_unreachable ();
10540 gcc_assert (operator_code != MAX_TREE_CODES);
10541 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10544 switch (operator_code)
10547 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10551 TYPE_GETS_DELETE (class_type) |= 1;
10555 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10558 case VEC_DELETE_EXPR:
10559 TYPE_GETS_DELETE (class_type) |= 2;
10566 /* [basic.std.dynamic.allocation]/1:
10568 A program is ill-formed if an allocation function is declared
10569 in a namespace scope other than global scope or declared static
10572 The same also holds true for deallocation functions. */
10573 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10574 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10576 if (DECL_NAMESPACE_SCOPE_P (decl))
10578 if (CP_DECL_CONTEXT (decl) != global_namespace)
10580 error ("%qD may not be declared within a namespace", decl);
10583 else if (!TREE_PUBLIC (decl))
10585 error ("%qD may not be declared as static", decl);
10591 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10593 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10594 DECL_IS_OPERATOR_NEW (decl) = 1;
10596 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10597 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10600 /* An operator function must either be a non-static member function
10601 or have at least one parameter of a class, a reference to a class,
10602 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10603 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10605 if (operator_code == TYPE_EXPR
10606 || operator_code == CALL_EXPR
10607 || operator_code == COMPONENT_REF
10608 || operator_code == ARRAY_REF
10609 || operator_code == NOP_EXPR)
10611 error ("%qD must be a nonstatic member function", decl);
10618 if (DECL_STATIC_FUNCTION_P (decl))
10620 error ("%qD must be either a non-static member "
10621 "function or a non-member function", decl);
10625 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10627 tree arg = non_reference (TREE_VALUE (p));
10628 if (arg == error_mark_node)
10631 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10632 because these checks are performed even on
10633 template functions. */
10634 if (MAYBE_CLASS_TYPE_P (arg)
10635 || TREE_CODE (arg) == ENUMERAL_TYPE)
10639 if (!p || p == void_list_node)
10642 error ("%qD must have an argument of class or "
10643 "enumerated type", decl);
10649 /* There are no restrictions on the arguments to an overloaded
10651 if (operator_code == CALL_EXPR)
10654 /* Warn about conversion operators that will never be used. */
10655 if (IDENTIFIER_TYPENAME_P (name)
10656 && ! DECL_TEMPLATE_INFO (decl)
10658 /* Warn only declaring the function; there is no need to
10659 warn again about out-of-class definitions. */
10660 && class_type == current_class_type)
10662 tree t = TREE_TYPE (name);
10663 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10666 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10668 if (TREE_CODE (t) == VOID_TYPE)
10669 warning (OPT_Wconversion,
10671 ? G_("conversion to a reference to void "
10672 "will never use a type conversion operator")
10673 : G_("conversion to void "
10674 "will never use a type conversion operator"));
10675 else if (class_type)
10677 if (t == class_type)
10678 warning (OPT_Wconversion,
10680 ? G_("conversion to a reference to the same type "
10681 "will never use a type conversion operator")
10682 : G_("conversion to the same type "
10683 "will never use a type conversion operator"));
10684 /* Don't force t to be complete here. */
10685 else if (MAYBE_CLASS_TYPE_P (t)
10686 && COMPLETE_TYPE_P (t)
10687 && DERIVED_FROM_P (t, class_type))
10688 warning (OPT_Wconversion,
10690 ? G_("conversion to a reference to a base class "
10691 "will never use a type conversion operator")
10692 : G_("conversion to a base class "
10693 "will never use a type conversion operator"));
10698 if (operator_code == COND_EXPR)
10701 error ("ISO C++ prohibits overloading operator ?:");
10704 else if (ellipsis_p)
10706 error ("%qD must not have variable number of arguments", decl);
10709 else if (ambi_op_p (operator_code))
10712 /* We pick the one-argument operator codes by default, so
10713 we don't have to change anything. */
10715 else if (arity == 2)
10717 /* If we thought this was a unary operator, we now know
10718 it to be a binary operator. */
10719 switch (operator_code)
10722 operator_code = MULT_EXPR;
10726 operator_code = BIT_AND_EXPR;
10729 case UNARY_PLUS_EXPR:
10730 operator_code = PLUS_EXPR;
10734 operator_code = MINUS_EXPR;
10737 case PREINCREMENT_EXPR:
10738 operator_code = POSTINCREMENT_EXPR;
10741 case PREDECREMENT_EXPR:
10742 operator_code = POSTDECREMENT_EXPR;
10746 gcc_unreachable ();
10749 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10751 if ((operator_code == POSTINCREMENT_EXPR
10752 || operator_code == POSTDECREMENT_EXPR)
10753 && ! processing_template_decl
10754 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10757 error ("postfix %qD must take %<int%> as its argument",
10760 error ("postfix %qD must take %<int%> as its second "
10768 error ("%qD must take either zero or one argument", decl);
10770 error ("%qD must take either one or two arguments", decl);
10774 /* More Effective C++ rule 6. */
10776 && (operator_code == POSTINCREMENT_EXPR
10777 || operator_code == POSTDECREMENT_EXPR
10778 || operator_code == PREINCREMENT_EXPR
10779 || operator_code == PREDECREMENT_EXPR))
10781 tree arg = TREE_VALUE (argtypes);
10782 tree ret = TREE_TYPE (TREE_TYPE (decl));
10783 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10784 arg = TREE_TYPE (arg);
10785 arg = TYPE_MAIN_VARIANT (arg);
10786 if (operator_code == PREINCREMENT_EXPR
10787 || operator_code == PREDECREMENT_EXPR)
10789 if (TREE_CODE (ret) != REFERENCE_TYPE
10790 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10792 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10793 build_reference_type (arg));
10797 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10798 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10802 else if (unary_op_p (operator_code))
10807 error ("%qD must take %<void%>", decl);
10809 error ("%qD must take exactly one argument", decl);
10813 else /* if (binary_op_p (operator_code)) */
10818 error ("%qD must take exactly one argument", decl);
10820 error ("%qD must take exactly two arguments", decl);
10824 /* More Effective C++ rule 7. */
10826 && (operator_code == TRUTH_ANDIF_EXPR
10827 || operator_code == TRUTH_ORIF_EXPR
10828 || operator_code == COMPOUND_EXPR))
10829 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10833 /* Effective C++ rule 23. */
10836 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10837 && (operator_code == PLUS_EXPR
10838 || operator_code == MINUS_EXPR
10839 || operator_code == TRUNC_DIV_EXPR
10840 || operator_code == MULT_EXPR
10841 || operator_code == TRUNC_MOD_EXPR)
10842 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10843 warning (OPT_Weffc__, "%qD should return by value", decl);
10845 /* [over.oper]/8 */
10846 for (; argtypes && argtypes != void_list_node;
10847 argtypes = TREE_CHAIN (argtypes))
10848 if (TREE_PURPOSE (argtypes))
10850 TREE_PURPOSE (argtypes) = NULL_TREE;
10851 if (operator_code == POSTINCREMENT_EXPR
10852 || operator_code == POSTDECREMENT_EXPR)
10854 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10859 error ("%qD cannot have default arguments", decl);
10867 /* Return a string giving the keyword associate with CODE. */
10869 static const char *
10870 tag_name (enum tag_types code)
10882 case typename_type:
10885 gcc_unreachable ();
10889 /* Name lookup in an elaborated-type-specifier (after the keyword
10890 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10891 elaborated-type-specifier is invalid, issue a diagnostic and return
10892 error_mark_node; otherwise, return the *_TYPE to which it referred.
10893 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10896 check_elaborated_type_specifier (enum tag_types tag_code,
10898 bool allow_template_p)
10904 struct S { struct S *p; };
10906 name lookup will find the TYPE_DECL for the implicit "S::S"
10907 typedef. Adjust for that here. */
10908 if (DECL_SELF_REFERENCE_P (decl))
10909 decl = TYPE_NAME (TREE_TYPE (decl));
10911 type = TREE_TYPE (decl);
10913 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10914 is false for this case as well. */
10915 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10917 error ("using template type parameter %qT after %qs",
10918 type, tag_name (tag_code));
10919 return error_mark_node;
10923 If the identifier resolves to a typedef-name or a template
10924 type-parameter, the elaborated-type-specifier is ill-formed.
10926 In other words, the only legitimate declaration to use in the
10927 elaborated type specifier is the implicit typedef created when
10928 the type is declared. */
10929 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10930 && !DECL_SELF_REFERENCE_P (decl)
10931 && tag_code != typename_type)
10933 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10934 error ("%q+D has a previous declaration here", decl);
10935 return error_mark_node;
10937 else if (TREE_CODE (type) != RECORD_TYPE
10938 && TREE_CODE (type) != UNION_TYPE
10939 && tag_code != enum_type
10940 && tag_code != typename_type)
10942 error ("%qT referred to as %qs", type, tag_name (tag_code));
10943 error ("%q+T has a previous declaration here", type);
10944 return error_mark_node;
10946 else if (TREE_CODE (type) != ENUMERAL_TYPE
10947 && tag_code == enum_type)
10949 error ("%qT referred to as enum", type);
10950 error ("%q+T has a previous declaration here", type);
10951 return error_mark_node;
10953 else if (!allow_template_p
10954 && TREE_CODE (type) == RECORD_TYPE
10955 && CLASSTYPE_IS_TEMPLATE (type))
10957 /* If a class template appears as elaborated type specifier
10958 without a template header such as:
10960 template <class T> class C {};
10961 void f(class C); // No template header here
10963 then the required template argument is missing. */
10964 error ("template argument required for %<%s %T%>",
10965 tag_name (tag_code),
10966 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10967 return error_mark_node;
10973 /* Lookup NAME in elaborate type specifier in scope according to
10974 SCOPE and issue diagnostics if necessary.
10975 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10976 found, and ERROR_MARK_NODE for type error. */
10979 lookup_and_check_tag (enum tag_types tag_code, tree name,
10980 tag_scope scope, bool template_header_p)
10984 if (scope == ts_global)
10986 /* First try ordinary name lookup, ignoring hidden class name
10987 injected via friend declaration. */
10988 decl = lookup_name_prefer_type (name, 2);
10989 /* If that fails, the name will be placed in the smallest
10990 non-class, non-function-prototype scope according to 3.3.1/5.
10991 We may already have a hidden name declared as friend in this
10992 scope. So lookup again but not ignoring hidden names.
10993 If we find one, that name will be made visible rather than
10994 creating a new tag. */
10996 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10999 decl = lookup_type_scope (name, scope);
11001 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11002 decl = DECL_TEMPLATE_RESULT (decl);
11004 if (decl && TREE_CODE (decl) == TYPE_DECL)
11006 /* Look for invalid nested type:
11010 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11012 error ("%qD has the same name as the class in which it is "
11015 return error_mark_node;
11018 /* Two cases we need to consider when deciding if a class
11019 template is allowed as an elaborated type specifier:
11020 1. It is a self reference to its own class.
11021 2. It comes with a template header.
11025 template <class T> class C {
11026 class C *c1; // DECL_SELF_REFERENCE_P is true
11029 template <class U> class C; // template_header_p is true
11030 template <class T> class C<T>::D {
11031 class C *c2; // DECL_SELF_REFERENCE_P is true
11034 t = check_elaborated_type_specifier (tag_code,
11037 | DECL_SELF_REFERENCE_P (decl));
11040 else if (decl && TREE_CODE (decl) == TREE_LIST)
11042 error ("reference to %qD is ambiguous", name);
11043 print_candidates (decl);
11044 return error_mark_node;
11050 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11051 Define the tag as a forward-reference if it is not defined.
11053 If a declaration is given, process it here, and report an error if
11054 multiple declarations are not identical.
11056 SCOPE is TS_CURRENT when this is also a definition. Only look in
11057 the current frame for the name (since C++ allows new names in any
11058 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11059 declaration. Only look beginning from the current scope outward up
11060 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11062 TEMPLATE_HEADER_P is true when this declaration is preceded by
11063 a set of template parameters. */
11066 xref_tag (enum tag_types tag_code, tree name,
11067 tag_scope scope, bool template_header_p)
11069 enum tree_code code;
11071 tree context = NULL_TREE;
11073 timevar_push (TV_NAME_LOOKUP);
11075 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11081 code = RECORD_TYPE;
11087 code = ENUMERAL_TYPE;
11090 gcc_unreachable ();
11093 /* In case of anonymous name, xref_tag is only called to
11094 make type node and push name. Name lookup is not required. */
11095 if (ANON_AGGRNAME_P (name))
11098 t = lookup_and_check_tag (tag_code, name,
11099 scope, template_header_p);
11101 if (t == error_mark_node)
11102 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11104 if (scope != ts_current && t && current_class_type
11105 && template_class_depth (current_class_type)
11106 && template_header_p)
11108 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11109 definition of this tag. Since, in addition, we are currently
11110 processing a (member) template declaration of a template
11111 class, we must be very careful; consider:
11118 { template <class V>
11119 friend struct S1; };
11121 Here, the S2::S1 declaration should not be confused with the
11122 outer declaration. In particular, the inner version should
11123 have a template parameter of level 2, not level 1. This
11124 would be particularly important if the member declaration
11127 template <class V = U> friend struct S1;
11129 say, when we should tsubst into `U' when instantiating
11130 S2. On the other hand, when presented with:
11140 we must find the inner binding eventually. We
11141 accomplish this by making sure that the new type we
11142 create to represent this declaration has the right
11144 context = TYPE_CONTEXT (t);
11150 /* If no such tag is yet defined, create a forward-reference node
11151 and record it as the "definition".
11152 When a real declaration of this type is found,
11153 the forward-reference will be altered into a real type. */
11154 if (code == ENUMERAL_TYPE)
11156 error ("use of enum %q#D without previous declaration", name);
11157 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11161 t = make_class_type (code);
11162 TYPE_CONTEXT (t) = context;
11163 t = pushtag (name, t, scope);
11168 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11170 if (!redeclare_class_template (t, current_template_parms))
11171 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11173 else if (!processing_template_decl
11174 && CLASS_TYPE_P (t)
11175 && CLASSTYPE_IS_TEMPLATE (t))
11177 error ("redeclaration of %qT as a non-template", t);
11178 error ("previous declaration %q+D", t);
11179 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11182 /* Make injected friend class visible. */
11183 if (scope != ts_within_enclosing_non_class
11184 && hidden_name_p (TYPE_NAME (t)))
11186 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11187 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11189 if (TYPE_TEMPLATE_INFO (t))
11191 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11192 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11197 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11201 xref_tag_from_type (tree old, tree id, tag_scope scope)
11203 enum tag_types tag_kind;
11205 if (TREE_CODE (old) == RECORD_TYPE)
11206 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11208 tag_kind = union_type;
11210 if (id == NULL_TREE)
11211 id = TYPE_IDENTIFIER (old);
11213 return xref_tag (tag_kind, id, scope, false);
11216 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11217 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11218 access_* node, and the TREE_VALUE is the type of the base-class.
11219 Non-NULL TREE_TYPE indicates virtual inheritance.
11221 Returns true if the binfo hierarchy was successfully created,
11222 false if an error was detected. */
11225 xref_basetypes (tree ref, tree base_list)
11228 tree binfo, base_binfo;
11229 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11230 unsigned max_bases = 0; /* Maximum direct bases. */
11232 tree default_access;
11233 tree igo_prev; /* Track Inheritance Graph Order. */
11235 if (ref == error_mark_node)
11238 /* The base of a derived class is private by default, all others are
11240 default_access = (TREE_CODE (ref) == RECORD_TYPE
11241 && CLASSTYPE_DECLARED_CLASS (ref)
11242 ? access_private_node : access_public_node);
11244 /* First, make sure that any templates in base-classes are
11245 instantiated. This ensures that if we call ourselves recursively
11246 we do not get confused about which classes are marked and which
11248 basep = &base_list;
11251 tree basetype = TREE_VALUE (*basep);
11253 if (!(processing_template_decl && uses_template_parms (basetype))
11254 && !complete_type_or_else (basetype, NULL))
11255 /* An incomplete type. Remove it from the list. */
11256 *basep = TREE_CHAIN (*basep);
11260 if (TREE_TYPE (*basep))
11262 if (CLASS_TYPE_P (basetype))
11263 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11264 basep = &TREE_CHAIN (*basep);
11268 TYPE_MARKED_P (ref) = 1;
11270 /* The binfo slot should be empty, unless this is an (ill-formed)
11272 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11274 error ("redefinition of %q#T", ref);
11278 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11280 binfo = make_tree_binfo (max_bases);
11282 TYPE_BINFO (ref) = binfo;
11283 BINFO_OFFSET (binfo) = size_zero_node;
11284 BINFO_TYPE (binfo) = ref;
11286 /* Apply base-class info set up to the variants of this type. */
11287 fixup_type_variants (ref);
11291 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11292 /* An aggregate cannot have baseclasses. */
11293 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11295 if (TREE_CODE (ref) == UNION_TYPE)
11297 error ("derived union %qT invalid", ref);
11304 if (TYPE_FOR_JAVA (ref))
11306 error ("Java class %qT cannot have multiple bases", ref);
11313 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11315 if (TYPE_FOR_JAVA (ref))
11317 error ("Java class %qT cannot have virtual bases", ref);
11322 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11324 tree access = TREE_PURPOSE (base_list);
11325 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11326 tree basetype = TREE_VALUE (base_list);
11328 if (access == access_default_node)
11329 access = default_access;
11331 if (PACK_EXPANSION_P (basetype))
11332 basetype = PACK_EXPANSION_PATTERN (basetype);
11333 if (TREE_CODE (basetype) == TYPE_DECL)
11334 basetype = TREE_TYPE (basetype);
11335 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11337 error ("base type %qT fails to be a struct or class type",
11342 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11343 TYPE_FOR_JAVA (ref) = 1;
11345 base_binfo = NULL_TREE;
11346 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11348 base_binfo = TYPE_BINFO (basetype);
11349 /* The original basetype could have been a typedef'd type. */
11350 basetype = BINFO_TYPE (base_binfo);
11352 /* Inherit flags from the base. */
11353 TYPE_HAS_NEW_OPERATOR (ref)
11354 |= TYPE_HAS_NEW_OPERATOR (basetype);
11355 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11356 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11357 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11358 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11359 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11360 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11361 CLASSTYPE_REPEATED_BASE_P (ref)
11362 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11365 /* We must do this test after we've seen through a typedef
11367 if (TYPE_MARKED_P (basetype))
11369 if (basetype == ref)
11370 error ("recursive type %qT undefined", basetype);
11372 error ("duplicate base type %qT invalid", basetype);
11376 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11377 /* Regenerate the pack expansion for the bases. */
11378 basetype = make_pack_expansion (basetype);
11380 TYPE_MARKED_P (basetype) = 1;
11382 base_binfo = copy_binfo (base_binfo, basetype, ref,
11383 &igo_prev, via_virtual);
11384 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11385 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11387 BINFO_BASE_APPEND (binfo, base_binfo);
11388 BINFO_BASE_ACCESS_APPEND (binfo, access);
11391 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11392 /* If we have space in the vbase vector, we must have shared at
11393 least one of them, and are therefore diamond shaped. */
11394 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11396 /* Unmark all the types. */
11397 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11398 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11399 TYPE_MARKED_P (ref) = 0;
11401 /* Now see if we have a repeated base type. */
11402 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11404 for (base_binfo = binfo; base_binfo;
11405 base_binfo = TREE_CHAIN (base_binfo))
11407 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11409 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11412 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11414 for (base_binfo = binfo; base_binfo;
11415 base_binfo = TREE_CHAIN (base_binfo))
11416 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11417 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11426 /* Copies the enum-related properties from type SRC to type DST.
11427 Used with the underlying type of an enum and the enum itself. */
11429 copy_type_enum (tree dst, tree src)
11431 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11432 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11433 TYPE_SIZE (dst) = TYPE_SIZE (src);
11434 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11435 SET_TYPE_MODE (dst, TYPE_MODE (src));
11436 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11437 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11438 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11439 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11442 /* Begin compiling the definition of an enumeration type.
11445 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11447 UNDERLYING_TYPE is the type that will be used as the storage for
11448 the enumeration type. This should be NULL_TREE if no storage type
11451 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11453 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11455 Returns the type object, as yet incomplete.
11456 Also records info about it so that build_enumerator
11457 may be used to declare the individual values as they are read. */
11460 start_enum (tree name, tree enumtype, tree underlying_type,
11461 bool scoped_enum_p, bool *is_new)
11463 tree prevtype = NULL_TREE;
11464 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11468 /* [C++0x dcl.enum]p5:
11470 If not explicitly specified, the underlying type of a scoped
11471 enumeration type is int. */
11472 if (!underlying_type && scoped_enum_p)
11473 underlying_type = integer_type_node;
11475 if (underlying_type)
11476 underlying_type = cv_unqualified (underlying_type);
11478 /* If this is the real definition for a previous forward reference,
11479 fill in the contents in the same object that used to be the
11480 forward reference. */
11482 enumtype = lookup_and_check_tag (enum_type, name,
11483 /*tag_scope=*/ts_current,
11484 /*template_header_p=*/false);
11486 /* In case of a template_decl, the only check that should be deferred
11487 to instantiation time is the comparison of underlying types. */
11488 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11490 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11492 error_at (input_location, "scoped/unscoped mismatch "
11493 "in enum %q#T", enumtype);
11494 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11495 "previous definition here");
11496 enumtype = error_mark_node;
11498 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11500 error_at (input_location, "underlying type mismatch "
11501 "in enum %q#T", enumtype);
11502 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11503 "previous definition here");
11504 enumtype = error_mark_node;
11506 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11507 && !dependent_type_p (underlying_type)
11508 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11509 && !same_type_p (underlying_type,
11510 ENUM_UNDERLYING_TYPE (enumtype)))
11512 error_at (input_location, "different underlying type "
11513 "in enum %q#T", enumtype);
11514 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11515 "previous definition here");
11516 underlying_type = NULL_TREE;
11520 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11521 || processing_template_decl)
11523 /* In case of error, make a dummy enum to allow parsing to
11525 if (enumtype == error_mark_node)
11527 name = make_anon_name ();
11528 enumtype = NULL_TREE;
11531 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11532 of an opaque enum, or an opaque enum of an already defined
11533 enumeration (C++0x only).
11534 In any other case, it'll be NULL_TREE. */
11540 prevtype = enumtype;
11541 enumtype = cxx_make_type (ENUMERAL_TYPE);
11542 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11543 if (enumtype == error_mark_node)
11544 return error_mark_node;
11546 /* The enum is considered opaque until the opening '{' of the
11547 enumerator list. */
11548 SET_OPAQUE_ENUM_P (enumtype, true);
11549 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11552 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11554 if (underlying_type)
11556 if (CP_INTEGRAL_TYPE_P (underlying_type))
11558 copy_type_enum (enumtype, underlying_type);
11559 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11561 else if (dependent_type_p (underlying_type))
11562 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11564 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11565 underlying_type, enumtype);
11568 /* If into a template class, the returned enum is always the first
11569 declaration (opaque or not) seen. This way all the references to
11570 this type will be to the same declaration. The following ones are used
11571 only to check for definition errors. */
11572 if (prevtype && processing_template_decl)
11578 /* After processing and defining all the values of an enumeration type,
11579 install their decls in the enumeration type.
11580 ENUMTYPE is the type object. */
11583 finish_enum_value_list (tree enumtype)
11586 tree underlying_type;
11589 tree minnode, maxnode;
11592 bool fixed_underlying_type_p
11593 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11595 /* We built up the VALUES in reverse order. */
11596 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11598 /* For an enum defined in a template, just set the type of the values;
11599 all further processing is postponed until the template is
11600 instantiated. We need to set the type so that tsubst of a CONST_DECL
11602 if (processing_template_decl)
11604 for (values = TYPE_VALUES (enumtype);
11606 values = TREE_CHAIN (values))
11607 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11611 /* Determine the minimum and maximum values of the enumerators. */
11612 if (TYPE_VALUES (enumtype))
11614 minnode = maxnode = NULL_TREE;
11616 for (values = TYPE_VALUES (enumtype);
11618 values = TREE_CHAIN (values))
11620 decl = TREE_VALUE (values);
11622 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11623 each enumerator has the type of its enumeration. Prior to the
11624 closing brace, the type of each enumerator is the type of its
11625 initializing value. */
11626 TREE_TYPE (decl) = enumtype;
11628 /* Update the minimum and maximum values, if appropriate. */
11629 value = DECL_INITIAL (decl);
11630 if (value == error_mark_node)
11631 value = integer_zero_node;
11632 /* Figure out what the minimum and maximum values of the
11633 enumerators are. */
11635 minnode = maxnode = value;
11636 else if (tree_int_cst_lt (maxnode, value))
11638 else if (tree_int_cst_lt (value, minnode))
11645 If the enumerator-list is empty, the underlying type is as if
11646 the enumeration had a single enumerator with value 0. */
11647 minnode = maxnode = integer_zero_node;
11649 if (!fixed_underlying_type_p)
11651 /* Compute the number of bits require to represent all values of the
11652 enumeration. We must do this before the type of MINNODE and
11653 MAXNODE are transformed, since tree_int_cst_min_precision relies
11654 on the TREE_TYPE of the value it is passed. */
11655 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11656 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11657 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11658 int precision = MAX (lowprec, highprec);
11660 bool use_short_enum;
11662 /* Determine the underlying type of the enumeration.
11666 The underlying type of an enumeration is an integral type that
11667 can represent all the enumerator values defined in the
11668 enumeration. It is implementation-defined which integral type is
11669 used as the underlying type for an enumeration except that the
11670 underlying type shall not be larger than int unless the value of
11671 an enumerator cannot fit in an int or unsigned int.
11673 We use "int" or an "unsigned int" as the underlying type, even if
11674 a smaller integral type would work, unless the user has
11675 explicitly requested that we use the smallest possible type. The
11676 user can request that for all enumerations with a command line
11677 flag, or for just one enumeration with an attribute. */
11679 use_short_enum = flag_short_enums
11680 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11682 for (itk = (use_short_enum ? itk_char : itk_int);
11686 underlying_type = integer_types[itk];
11687 if (underlying_type != NULL_TREE
11688 && TYPE_PRECISION (underlying_type) >= precision
11689 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11692 if (itk == itk_none)
11696 IF no integral type can represent all the enumerator values, the
11697 enumeration is ill-formed. */
11698 error ("no integral type can represent all of the enumerator values "
11699 "for %qT", enumtype);
11700 precision = TYPE_PRECISION (long_long_integer_type_node);
11701 underlying_type = integer_types[itk_unsigned_long_long];
11706 The value of sizeof() applied to an enumeration type, an object
11707 of an enumeration type, or an enumerator, is the value of sizeof()
11708 applied to the underlying type. */
11709 copy_type_enum (enumtype, underlying_type);
11711 /* Compute the minimum and maximum values for the type.
11715 For an enumeration where emin is the smallest enumerator and emax
11716 is the largest, the values of the enumeration are the values of the
11717 underlying type in the range bmin to bmax, where bmin and bmax are,
11718 respectively, the smallest and largest values of the smallest bit-
11719 field that can store emin and emax. */
11721 /* The middle-end currently assumes that types with TYPE_PRECISION
11722 narrower than their underlying type are suitably zero or sign
11723 extended to fill their mode. Similarly, it assumes that the front
11724 end assures that a value of a particular type must be within
11725 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11727 We used to set these fields based on bmin and bmax, but that led
11728 to invalid assumptions like optimizing away bounds checking. So
11729 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11730 TYPE_MAX_VALUE to the values for the mode above and only restrict
11731 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11732 ENUM_UNDERLYING_TYPE (enumtype)
11733 = build_distinct_type_copy (underlying_type);
11734 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11735 set_min_and_max_values_for_integral_type
11736 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11738 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11739 if (flag_strict_enums)
11740 set_min_and_max_values_for_integral_type (enumtype, precision,
11744 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11746 /* Convert each of the enumerators to the type of the underlying
11747 type of the enumeration. */
11748 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11750 location_t saved_location;
11752 decl = TREE_VALUE (values);
11753 saved_location = input_location;
11754 input_location = DECL_SOURCE_LOCATION (decl);
11755 if (fixed_underlying_type_p)
11756 /* If the enumeration type has a fixed underlying type, we
11757 already checked all of the enumerator values. */
11758 value = DECL_INITIAL (decl);
11760 value = perform_implicit_conversion (underlying_type,
11761 DECL_INITIAL (decl),
11762 tf_warning_or_error);
11763 input_location = saved_location;
11765 /* Do not clobber shared ints. */
11766 value = copy_node (value);
11768 TREE_TYPE (value) = enumtype;
11769 DECL_INITIAL (decl) = value;
11772 /* Fix up all variant types of this enum type. */
11773 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11774 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11776 /* Finish debugging output for this type. */
11777 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11780 /* Finishes the enum type. This is called only the first time an
11781 enumeration is seen, be it opaque or odinary.
11782 ENUMTYPE is the type object. */
11785 finish_enum (tree enumtype)
11787 if (processing_template_decl)
11789 if (at_function_scope_p ())
11790 add_stmt (build_min (TAG_DEFN, enumtype));
11794 /* Here there should not be any variants of this type. */
11795 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11796 && !TYPE_NEXT_VARIANT (enumtype));
11799 /* Build and install a CONST_DECL for an enumeration constant of the
11800 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11801 LOC is the location of NAME.
11802 Assignment of sequential values by default is handled here. */
11805 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11811 /* If the VALUE was erroneous, pretend it wasn't there; that will
11812 result in the enum being assigned the next value in sequence. */
11813 if (value == error_mark_node)
11816 /* Remove no-op casts from the value. */
11818 STRIP_TYPE_NOPS (value);
11820 if (! processing_template_decl)
11822 /* Validate and default VALUE. */
11823 if (value != NULL_TREE)
11825 value = cxx_constant_value (value);
11827 if (TREE_CODE (value) == INTEGER_CST)
11829 value = perform_integral_promotions (value);
11833 error ("enumerator value for %qD is not an integer constant", name);
11838 /* Default based on previous value. */
11839 if (value == NULL_TREE)
11841 if (TYPE_VALUES (enumtype))
11844 unsigned HOST_WIDE_INT lo;
11848 /* The next value is the previous value plus one.
11849 add_double doesn't know the type of the target expression,
11850 so we must check with int_fits_type_p as well. */
11851 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11852 if (error_operand_p (prev_value))
11853 value = error_mark_node;
11856 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11857 TREE_INT_CST_HIGH (prev_value),
11859 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11861 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11865 error ("overflow in enumeration values at %qD", name);
11866 value = error_mark_node;
11871 value = integer_zero_node;
11874 /* Remove no-op casts from the value. */
11875 STRIP_TYPE_NOPS (value);
11877 /* If the underlying type of the enum is fixed, check whether
11878 the enumerator values fits in the underlying type. If it
11879 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11880 if (ENUM_UNDERLYING_TYPE (enumtype)
11882 && TREE_CODE (value) == INTEGER_CST
11883 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11885 error ("enumerator value %E is too large for underlying type %<%T%>",
11886 value, ENUM_UNDERLYING_TYPE (enumtype));
11888 /* Silently convert the value so that we can continue. */
11889 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11894 /* C++ associates enums with global, function, or class declarations. */
11895 context = current_scope ();
11897 /* Build the actual enumeration constant. Note that the enumeration
11898 constants have the underlying type of the enum (if it is fixed)
11899 or the type of their initializer (if the underlying type of the
11900 enum is not fixed):
11904 If the underlying type is fixed, the type of each enumerator
11905 prior to the closing brace is the underlying type; if the
11906 initializing value of an enumerator cannot be represented by
11907 the underlying type, the program is ill-formed. If the
11908 underlying type is not fixed, the type of each enumerator is
11909 the type of its initializing value.
11911 If the underlying type is not fixed, it will be computed by
11912 finish_enum and we will reset the type of this enumerator. Of
11913 course, if we're processing a template, there may be no value. */
11914 type = value ? TREE_TYPE (value) : NULL_TREE;
11916 if (context && context == current_class_type)
11917 /* This enum declaration is local to the class. We need the full
11918 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11919 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11921 /* It's a global enum, or it's local to a function. (Note local to
11922 a function could mean local to a class method. */
11923 decl = build_decl (loc, CONST_DECL, name, type);
11925 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11926 TREE_CONSTANT (decl) = 1;
11927 TREE_READONLY (decl) = 1;
11928 DECL_INITIAL (decl) = value;
11930 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11931 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11932 on the TYPE_FIELDS list for `S'. (That's so that you can say
11933 things like `S::i' later.) */
11934 finish_member_declaration (decl);
11938 /* Add this enumeration constant to the list for this type. */
11939 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11942 /* Look for an enumerator with the given NAME within the enumeration
11943 type ENUMTYPE. This routine is used primarily for qualified name
11944 lookup into an enumerator in C++0x, e.g.,
11946 enum class Color { Red, Green, Blue };
11948 Color color = Color::Red;
11950 Returns the value corresponding to the enumerator, or
11951 NULL_TREE if no such enumerator was found. */
11953 lookup_enumerator (tree enumtype, tree name)
11956 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11958 e = purpose_member (name, TYPE_VALUES (enumtype));
11959 return e? TREE_VALUE (e) : NULL_TREE;
11963 /* We're defining DECL. Make sure that its type is OK. */
11966 check_function_type (tree decl, tree current_function_parms)
11968 tree fntype = TREE_TYPE (decl);
11969 tree return_type = complete_type (TREE_TYPE (fntype));
11971 /* In a function definition, arg types must be complete. */
11972 require_complete_types_for_parms (current_function_parms);
11974 if (dependent_type_p (return_type))
11976 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11977 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11979 tree args = TYPE_ARG_TYPES (fntype);
11981 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11982 error ("return type %q#T is incomplete", return_type);
11984 error ("return type has Java class type %q#T", return_type);
11986 /* Make it return void instead. */
11987 if (TREE_CODE (fntype) == METHOD_TYPE)
11988 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11990 TREE_CHAIN (args));
11992 fntype = build_function_type (void_type_node, args);
11994 = build_exception_variant (fntype,
11995 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11996 fntype = (cp_build_type_attribute_variant
11997 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11998 TREE_TYPE (decl) = fntype;
12001 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12004 /* Create the FUNCTION_DECL for a function definition.
12005 DECLSPECS and DECLARATOR are the parts of the declaration;
12006 they describe the function's name and the type it returns,
12007 but twisted together in a fashion that parallels the syntax of C.
12009 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12010 DECLARATOR is really the DECL for the function we are about to
12011 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12012 indicating that the function is an inline defined in-class.
12014 This function creates a binding context for the function body
12015 as well as setting up the FUNCTION_DECL in current_function_decl.
12017 For C++, we must first check whether that datum makes any sense.
12018 For example, "class A local_a(1,2);" means that variable local_a
12019 is an aggregate of type A, which should have a constructor
12020 applied to it with the argument list [1, 2].
12022 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12023 or may be a BLOCK if the function has been defined previously
12024 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12025 error_mark_node if the function has never been defined, or
12026 a BLOCK if the function has been defined somewhere. */
12029 start_preparsed_function (tree decl1, tree attrs, int flags)
12031 tree ctype = NULL_TREE;
12034 int doing_friend = 0;
12035 struct cp_binding_level *bl;
12036 tree current_function_parms;
12037 struct c_fileinfo *finfo
12038 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12039 bool honor_interface;
12041 /* Sanity check. */
12042 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12043 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12045 fntype = TREE_TYPE (decl1);
12046 if (TREE_CODE (fntype) == METHOD_TYPE)
12047 ctype = TYPE_METHOD_BASETYPE (fntype);
12049 /* ISO C++ 11.4/5. A friend function defined in a class is in
12050 the (lexical) scope of the class in which it is defined. */
12051 if (!ctype && DECL_FRIEND_P (decl1))
12053 ctype = DECL_FRIEND_CONTEXT (decl1);
12055 /* CTYPE could be null here if we're dealing with a template;
12056 for example, `inline friend float foo()' inside a template
12057 will have no CTYPE set. */
12058 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12064 if (DECL_DECLARED_INLINE_P (decl1)
12065 && lookup_attribute ("noinline", attrs))
12066 warning (0, "inline function %q+D given attribute noinline", decl1);
12068 /* Handle gnu_inline attribute. */
12069 if (GNU_INLINE_P (decl1))
12071 DECL_EXTERNAL (decl1) = 1;
12072 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12073 DECL_INTERFACE_KNOWN (decl1) = 1;
12074 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12077 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12078 /* This is a constructor, we must ensure that any default args
12079 introduced by this definition are propagated to the clones
12080 now. The clones are used directly in overload resolution. */
12081 adjust_clone_args (decl1);
12083 /* Sometimes we don't notice that a function is a static member, and
12084 build a METHOD_TYPE for it. Fix that up now. */
12085 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12086 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12088 revert_static_member_fn (decl1);
12092 /* Set up current_class_type, and enter the scope of the class, if
12095 push_nested_class (ctype);
12096 else if (DECL_STATIC_FUNCTION_P (decl1))
12097 push_nested_class (DECL_CONTEXT (decl1));
12099 /* Now that we have entered the scope of the class, we must restore
12100 the bindings for any template parameters surrounding DECL1, if it
12101 is an inline member template. (Order is important; consider the
12102 case where a template parameter has the same name as a field of
12103 the class.) It is not until after this point that
12104 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12105 if (flags & SF_INCLASS_INLINE)
12106 maybe_begin_member_template_processing (decl1);
12108 /* Effective C++ rule 15. */
12110 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12111 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12112 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12114 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12115 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12116 if (!DECL_INITIAL (decl1))
12117 DECL_INITIAL (decl1) = error_mark_node;
12119 /* This function exists in static storage.
12120 (This does not mean `static' in the C sense!) */
12121 TREE_STATIC (decl1) = 1;
12123 /* We must call push_template_decl after current_class_type is set
12124 up. (If we are processing inline definitions after exiting a
12125 class scope, current_class_type will be NULL_TREE until set above
12126 by push_nested_class.) */
12127 if (processing_template_decl)
12129 /* FIXME: Handle error_mark_node more gracefully. */
12130 tree newdecl1 = push_template_decl (decl1);
12131 if (newdecl1 != error_mark_node)
12135 /* We are now in the scope of the function being defined. */
12136 current_function_decl = decl1;
12138 /* Save the parm names or decls from this function's declarator
12139 where store_parm_decls will find them. */
12140 current_function_parms = DECL_ARGUMENTS (decl1);
12142 /* Make sure the parameter and return types are reasonable. When
12143 you declare a function, these types can be incomplete, but they
12144 must be complete when you define the function. */
12145 check_function_type (decl1, current_function_parms);
12147 /* Build the return declaration for the function. */
12148 restype = TREE_TYPE (fntype);
12149 if (DECL_RESULT (decl1) == NULL_TREE)
12153 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12154 DECL_ARTIFICIAL (resdecl) = 1;
12155 DECL_IGNORED_P (resdecl) = 1;
12156 DECL_RESULT (decl1) = resdecl;
12158 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12161 /* Let the user know we're compiling this function. */
12162 announce_function (decl1);
12164 /* Record the decl so that the function name is defined.
12165 If we already have a decl for this name, and it is a FUNCTION_DECL,
12166 use the old decl. */
12167 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12169 /* A specialization is not used to guide overload resolution. */
12170 if (!DECL_FUNCTION_MEMBER_P (decl1)
12171 && !(DECL_USE_TEMPLATE (decl1) &&
12172 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12174 tree olddecl = pushdecl (decl1);
12176 if (olddecl == error_mark_node)
12177 /* If something went wrong when registering the declaration,
12178 use DECL1; we have to have a FUNCTION_DECL to use when
12179 parsing the body of the function. */
12183 /* Otherwise, OLDDECL is either a previous declaration
12184 of the same function or DECL1 itself. */
12186 if (warn_missing_declarations
12187 && olddecl == decl1
12188 && !DECL_MAIN_P (decl1)
12189 && TREE_PUBLIC (decl1)
12190 && !DECL_DECLARED_INLINE_P (decl1))
12194 /* Check whether DECL1 is in an anonymous
12196 for (context = DECL_CONTEXT (decl1);
12198 context = DECL_CONTEXT (context))
12200 if (TREE_CODE (context) == NAMESPACE_DECL
12201 && DECL_NAME (context) == NULL_TREE)
12205 if (context == NULL)
12206 warning (OPT_Wmissing_declarations,
12207 "no previous declaration for %q+D", decl1);
12215 /* We need to set the DECL_CONTEXT. */
12216 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12217 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12219 fntype = TREE_TYPE (decl1);
12221 /* If #pragma weak applies, mark the decl appropriately now.
12222 The pragma only applies to global functions. Because
12223 determining whether or not the #pragma applies involves
12224 computing the mangled name for the declaration, we cannot
12225 apply the pragma until after we have merged this declaration
12226 with any previous declarations; if the original declaration
12227 has a linkage specification, that specification applies to
12228 the definition as well, and may affect the mangled name. */
12229 if (DECL_FILE_SCOPE_P (decl1))
12230 maybe_apply_pragma_weak (decl1);
12233 /* constexpr functions must have literal argument types and
12234 literal return type. */
12235 validate_constexpr_fundecl (decl1);
12237 /* Reset this in case the call to pushdecl changed it. */
12238 current_function_decl = decl1;
12240 gcc_assert (DECL_INITIAL (decl1));
12242 /* This function may already have been parsed, in which case just
12243 return; our caller will skip over the body without parsing. */
12244 if (DECL_INITIAL (decl1) != error_mark_node)
12247 /* Initialize RTL machinery. We cannot do this until
12248 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12249 even when processing a template; this is how we get
12250 CFUN set up, and our per-function variables initialized.
12251 FIXME factor out the non-RTL stuff. */
12252 bl = current_binding_level;
12253 allocate_struct_function (decl1, processing_template_decl);
12255 /* Initialize the language data structures. Whenever we start
12256 a new function, we destroy temporaries in the usual way. */
12257 cfun->language = ggc_alloc_cleared_language_function ();
12258 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12259 current_binding_level = bl;
12261 /* Even though we're inside a function body, we still don't want to
12262 call expand_expr to calculate the size of a variable-sized array.
12263 We haven't necessarily assigned RTL to all variables yet, so it's
12264 not safe to try to expand expressions involving them. */
12265 cfun->dont_save_pending_sizes_p = 1;
12267 /* Start the statement-tree, start the tree now. */
12268 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12270 /* If we are (erroneously) defining a function that we have already
12271 defined before, wipe out what we knew before. */
12272 if (!DECL_PENDING_INLINE_P (decl1))
12273 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12275 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12277 /* We know that this was set up by `grokclassfn'. We do not
12278 wait until `store_parm_decls', since evil parse errors may
12279 never get us to that point. Here we keep the consistency
12280 between `current_class_type' and `current_class_ptr'. */
12281 tree t = DECL_ARGUMENTS (decl1);
12283 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12284 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12286 cp_function_chain->x_current_class_ref
12287 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12288 cp_function_chain->x_current_class_ptr = t;
12290 /* Constructors and destructors need to know whether they're "in
12291 charge" of initializing virtual base classes. */
12292 t = DECL_CHAIN (t);
12293 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12295 current_in_charge_parm = t;
12296 t = DECL_CHAIN (t);
12298 if (DECL_HAS_VTT_PARM_P (decl1))
12300 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12301 current_vtt_parm = t;
12305 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12306 /* Implicitly-defined methods (like the
12307 destructor for a class in which no destructor
12308 is explicitly declared) must not be defined
12309 until their definition is needed. So, we
12310 ignore interface specifications for
12311 compiler-generated functions. */
12312 && !DECL_ARTIFICIAL (decl1));
12314 if (DECL_INTERFACE_KNOWN (decl1))
12316 tree ctx = decl_function_context (decl1);
12318 if (DECL_NOT_REALLY_EXTERN (decl1))
12319 DECL_EXTERNAL (decl1) = 0;
12321 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12322 && TREE_PUBLIC (ctx))
12323 /* This is a function in a local class in an extern inline
12325 comdat_linkage (decl1);
12327 /* If this function belongs to an interface, it is public.
12328 If it belongs to someone else's interface, it is also external.
12329 This only affects inlines and template instantiations. */
12330 else if (!finfo->interface_unknown && honor_interface)
12332 if (DECL_DECLARED_INLINE_P (decl1)
12333 || DECL_TEMPLATE_INSTANTIATION (decl1)
12334 || processing_template_decl)
12336 DECL_EXTERNAL (decl1)
12337 = (finfo->interface_only
12338 || (DECL_DECLARED_INLINE_P (decl1)
12339 && ! flag_implement_inlines
12340 && !DECL_VINDEX (decl1)));
12342 /* For WIN32 we also want to put these in linkonce sections. */
12343 maybe_make_one_only (decl1);
12346 DECL_EXTERNAL (decl1) = 0;
12347 DECL_INTERFACE_KNOWN (decl1) = 1;
12348 /* If this function is in an interface implemented in this file,
12349 make sure that the back end knows to emit this function
12351 if (!DECL_EXTERNAL (decl1))
12352 mark_needed (decl1);
12354 else if (finfo->interface_unknown && finfo->interface_only
12355 && honor_interface)
12357 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12358 interface, we will have both finfo->interface_unknown and
12359 finfo->interface_only set. In that case, we don't want to
12360 use the normal heuristics because someone will supply a
12361 #pragma implementation elsewhere, and deducing it here would
12362 produce a conflict. */
12363 comdat_linkage (decl1);
12364 DECL_EXTERNAL (decl1) = 0;
12365 DECL_INTERFACE_KNOWN (decl1) = 1;
12366 DECL_DEFER_OUTPUT (decl1) = 1;
12370 /* This is a definition, not a reference.
12371 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12372 if (!GNU_INLINE_P (decl1))
12373 DECL_EXTERNAL (decl1) = 0;
12375 if ((DECL_DECLARED_INLINE_P (decl1)
12376 || DECL_TEMPLATE_INSTANTIATION (decl1))
12377 && ! DECL_INTERFACE_KNOWN (decl1))
12378 DECL_DEFER_OUTPUT (decl1) = 1;
12380 DECL_INTERFACE_KNOWN (decl1) = 1;
12383 /* Determine the ELF visibility attribute for the function. We must not
12384 do this before calling "pushdecl", as we must allow "duplicate_decls"
12385 to merge any attributes appropriately. We also need to wait until
12387 if (!DECL_CLONED_FUNCTION_P (decl1))
12388 determine_visibility (decl1);
12390 begin_scope (sk_function_parms, decl1);
12394 if (DECL_DESTRUCTOR_P (decl1)
12395 || (DECL_CONSTRUCTOR_P (decl1)
12396 && targetm.cxx.cdtor_returns_this ()))
12398 cdtor_label = build_decl (input_location,
12399 LABEL_DECL, NULL_TREE, NULL_TREE);
12400 DECL_CONTEXT (cdtor_label) = current_function_decl;
12403 start_fname_decls ();
12405 store_parm_decls (current_function_parms);
12409 /* Like start_preparsed_function, except that instead of a
12410 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12412 Returns 1 on success. If the DECLARATOR is not suitable for a function
12413 (it defines a datum instead), we return 0, which tells
12414 yyparse to report a parse error. */
12417 start_function (cp_decl_specifier_seq *declspecs,
12418 const cp_declarator *declarator,
12423 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12424 if (decl1 == error_mark_node)
12426 /* If the declarator is not suitable for a function definition,
12427 cause a syntax error. */
12428 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12430 error ("invalid function declaration");
12434 if (DECL_MAIN_P (decl1))
12435 /* main must return int. grokfndecl should have corrected it
12436 (and issued a diagnostic) if the user got it wrong. */
12437 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12438 integer_type_node));
12440 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12445 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12449 use_eh_spec_block (tree fn)
12451 return (flag_exceptions && flag_enforce_eh_specs
12452 && !processing_template_decl
12453 && !type_throw_all_p (TREE_TYPE (fn))
12454 /* We insert the EH_SPEC_BLOCK only in the original
12455 function; then, it is copied automatically to the
12457 && !DECL_CLONED_FUNCTION_P (fn)
12458 /* Implicitly-generated constructors and destructors have
12459 exception specifications. However, those specifications
12460 are the union of the possible exceptions specified by the
12461 constructors/destructors for bases and members, so no
12462 unallowed exception will ever reach this function. By
12463 not creating the EH_SPEC_BLOCK we save a little memory,
12464 and we avoid spurious warnings about unreachable
12466 && !DECL_ARTIFICIAL (fn));
12469 /* Store the parameter declarations into the current function declaration.
12470 This is called after parsing the parameter declarations, before
12471 digesting the body of the function.
12473 Also install to binding contour return value identifier, if any. */
12476 store_parm_decls (tree current_function_parms)
12478 tree fndecl = current_function_decl;
12481 /* This is a chain of any other decls that came in among the parm
12482 declarations. If a parm is declared with enum {foo, bar} x;
12483 then CONST_DECLs for foo and bar are put here. */
12484 tree nonparms = NULL_TREE;
12486 if (current_function_parms)
12488 /* This case is when the function was defined with an ANSI prototype.
12489 The parms already have decls, so we need not do anything here
12490 except record them as in effect
12491 and complain if any redundant old-style parm decls were written. */
12493 tree specparms = current_function_parms;
12496 /* Must clear this because it might contain TYPE_DECLs declared
12498 current_binding_level->names = NULL;
12500 /* If we're doing semantic analysis, then we'll call pushdecl
12501 for each of these. We must do them in reverse order so that
12502 they end in the correct forward order. */
12503 specparms = nreverse (specparms);
12505 for (parm = specparms; parm; parm = next)
12507 next = DECL_CHAIN (parm);
12508 if (TREE_CODE (parm) == PARM_DECL)
12510 if (DECL_NAME (parm) == NULL_TREE
12511 || TREE_CODE (parm) != VOID_TYPE)
12514 error ("parameter %qD declared void", parm);
12518 /* If we find an enum constant or a type tag,
12519 put it aside for the moment. */
12520 TREE_CHAIN (parm) = NULL_TREE;
12521 nonparms = chainon (nonparms, parm);
12525 /* Get the decls in their original chain order and record in the
12526 function. This is all and only the PARM_DECLs that were
12527 pushed into scope by the loop above. */
12528 DECL_ARGUMENTS (fndecl) = getdecls ();
12531 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12533 /* Now store the final chain of decls for the arguments
12534 as the decl-chain of the current lexical scope.
12535 Put the enumerators in as well, at the front so that
12536 DECL_ARGUMENTS is not modified. */
12537 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12539 if (use_eh_spec_block (current_function_decl))
12540 current_eh_spec_block = begin_eh_spec_block ();
12544 /* We have finished doing semantic analysis on DECL, but have not yet
12545 generated RTL for its body. Save away our current state, so that
12546 when we want to generate RTL later we know what to do. */
12549 save_function_data (tree decl)
12551 struct language_function *f;
12553 /* Save the language-specific per-function data so that we can
12554 get it back when we really expand this function. */
12555 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12558 f = ggc_alloc_language_function ();
12559 memcpy (f, cp_function_chain, sizeof (struct language_function));
12560 DECL_SAVED_FUNCTION_DATA (decl) = f;
12562 /* Clear out the bits we don't need. */
12563 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12564 f->bindings = NULL;
12565 f->x_local_names = NULL;
12569 /* Set the return value of the constructor (if present). */
12572 finish_constructor_body (void)
12577 if (targetm.cxx.cdtor_returns_this ()
12578 && (! TYPE_FOR_JAVA (current_class_type)))
12580 /* Any return from a constructor will end up here. */
12581 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12583 val = DECL_ARGUMENTS (current_function_decl);
12584 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12585 DECL_RESULT (current_function_decl), val);
12586 /* Return the address of the object. */
12587 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12588 add_stmt (exprstmt);
12592 /* Do all the processing for the beginning of a destructor; set up the
12593 vtable pointers and cleanups for bases and members. */
12596 begin_destructor_body (void)
12598 tree compound_stmt;
12600 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12601 issued an error message. We still want to try to process the
12602 body of the function, but initialize_vtbl_ptrs will crash if
12603 TYPE_BINFO is NULL. */
12604 if (COMPLETE_TYPE_P (current_class_type))
12606 compound_stmt = begin_compound_stmt (0);
12607 /* Make all virtual function table pointers in non-virtual base
12608 classes point to CURRENT_CLASS_TYPE's virtual function
12610 initialize_vtbl_ptrs (current_class_ptr);
12611 finish_compound_stmt (compound_stmt);
12613 /* And insert cleanups for our bases and members so that they
12614 will be properly destroyed if we throw. */
12615 push_base_cleanups ();
12619 /* At the end of every destructor we generate code to delete the object if
12620 necessary. Do that now. */
12623 finish_destructor_body (void)
12627 /* Any return from a destructor will end up here; that way all base
12628 and member cleanups will be run when the function returns. */
12629 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12631 /* In a virtual destructor, we must call delete. */
12632 if (DECL_VIRTUAL_P (current_function_decl))
12635 tree virtual_size = cxx_sizeof (current_class_type);
12639 At the point of definition of a virtual destructor (including
12640 an implicit definition), non-placement operator delete shall
12641 be looked up in the scope of the destructor's class and if
12642 found shall be accessible and unambiguous. */
12643 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12645 /*global_p=*/false,
12646 /*placement=*/NULL_TREE,
12647 /*alloc_fn=*/NULL_TREE);
12649 if_stmt = begin_if_stmt ();
12650 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12651 current_in_charge_parm,
12654 finish_expr_stmt (exprstmt);
12655 finish_then_clause (if_stmt);
12656 finish_if_stmt (if_stmt);
12659 if (targetm.cxx.cdtor_returns_this ())
12663 val = DECL_ARGUMENTS (current_function_decl);
12664 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12665 DECL_RESULT (current_function_decl), val);
12666 /* Return the address of the object. */
12667 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12668 add_stmt (exprstmt);
12672 /* Do the necessary processing for the beginning of a function body, which
12673 in this case includes member-initializers, but not the catch clauses of
12674 a function-try-block. Currently, this means opening a binding level
12675 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12678 begin_function_body (void)
12682 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12685 if (processing_template_decl)
12686 /* Do nothing now. */;
12688 /* Always keep the BLOCK node associated with the outermost pair of
12689 curly braces of a function. These are needed for correct
12690 operation of dwarfout.c. */
12691 keep_next_level (true);
12693 stmt = begin_compound_stmt (BCS_FN_BODY);
12695 if (processing_template_decl)
12696 /* Do nothing now. */;
12697 else if (DECL_DESTRUCTOR_P (current_function_decl))
12698 begin_destructor_body ();
12703 /* Do the processing for the end of a function body. Currently, this means
12704 closing out the cleanups for fully-constructed bases and members, and in
12705 the case of the destructor, deleting the object if desired. Again, this
12706 is only meaningful for [cd]tors, since they are the only functions where
12707 there is a significant distinction between the main body and any
12708 function catch clauses. Handling, say, main() return semantics here
12709 would be wrong, as flowing off the end of a function catch clause for
12710 main() would also need to return 0. */
12713 finish_function_body (tree compstmt)
12715 if (compstmt == NULL_TREE)
12718 /* Close the block. */
12719 finish_compound_stmt (compstmt);
12721 if (processing_template_decl)
12722 /* Do nothing now. */;
12723 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12724 finish_constructor_body ();
12725 else if (DECL_DESTRUCTOR_P (current_function_decl))
12726 finish_destructor_body ();
12729 /* Given a function, returns the BLOCK corresponding to the outermost level
12730 of curly braces, skipping the artificial block created for constructor
12734 outer_curly_brace_block (tree fndecl)
12736 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12737 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12738 /* Skip the artificial function body block. */
12739 block = BLOCK_SUBBLOCKS (block);
12743 /* If FNDECL is a class's key method, add the class to the list of
12744 keyed classes that should be emitted. */
12747 record_key_method_defined (tree fndecl)
12749 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12750 && DECL_VIRTUAL_P (fndecl)
12751 && !processing_template_decl)
12753 tree fnclass = DECL_CONTEXT (fndecl);
12754 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12755 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12759 /* Subroutine of finish_function.
12760 Save the body of constexpr functions for possible
12761 future compile time evaluation. */
12764 maybe_save_function_definition (tree fun)
12766 if (!processing_template_decl
12767 && DECL_DECLARED_CONSTEXPR_P (fun)
12768 && !DECL_CLONED_FUNCTION_P (fun))
12769 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12772 /* Finish up a function declaration and compile that function
12773 all the way to assembler language output. The free the storage
12774 for the function definition.
12776 FLAGS is a bitwise or of the following values:
12778 We just finished processing the body of an in-class inline
12779 function definition. (This processing will have taken place
12780 after the class definition is complete.) */
12783 finish_function (int flags)
12785 tree fndecl = current_function_decl;
12786 tree fntype, ctype = NULL_TREE;
12787 int inclass_inline = (flags & 2) != 0;
12789 /* When we get some parse errors, we can end up without a
12790 current_function_decl, so cope. */
12791 if (fndecl == NULL_TREE)
12792 return error_mark_node;
12794 gcc_assert (!defer_mark_used_calls);
12795 defer_mark_used_calls = true;
12797 record_key_method_defined (fndecl);
12799 fntype = TREE_TYPE (fndecl);
12801 /* TREE_READONLY (fndecl) = 1;
12802 This caused &foo to be of type ptr-to-const-function
12803 which then got a warning when stored in a ptr-to-function variable. */
12805 gcc_assert (building_stmt_tree ());
12806 /* The current function is being defined, so its DECL_INITIAL should
12807 be set, and unless there's a multiple definition, it should be
12808 error_mark_node. */
12809 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12811 /* For a cloned function, we've already got all the code we need;
12812 there's no need to add any extra bits. */
12813 if (!DECL_CLONED_FUNCTION_P (fndecl))
12815 if (DECL_MAIN_P (current_function_decl))
12819 /* Make it so that `main' always returns 0 by default (or
12822 stmt = finish_return_stmt (integer_one_node);
12824 stmt = finish_return_stmt (integer_zero_node);
12826 /* Hack. We don't want the middle-end to warn that this
12827 return is unreachable, so put the statement on the
12830 location_t linezero = linemap_line_start (line_table, 0, 1);
12831 SET_EXPR_LOCATION (stmt, linezero);
12835 if (use_eh_spec_block (current_function_decl))
12836 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12837 (TREE_TYPE (current_function_decl)),
12838 current_eh_spec_block);
12841 /* If we're saving up tree structure, tie off the function now. */
12842 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12844 finish_fname_decls ();
12846 /* If this function can't throw any exceptions, remember that. */
12847 if (!processing_template_decl
12848 && !cp_function_chain->can_throw
12849 && !flag_non_call_exceptions
12850 && !decl_replaceable_p (fndecl))
12851 TREE_NOTHROW (fndecl) = 1;
12853 /* This must come after expand_function_end because cleanups might
12854 have declarations (from inline functions) that need to go into
12855 this function's blocks. */
12857 /* If the current binding level isn't the outermost binding level
12858 for this function, either there is a bug, or we have experienced
12859 syntax errors and the statement tree is malformed. */
12860 if (current_binding_level->kind != sk_function_parms)
12862 /* Make sure we have already experienced errors. */
12863 gcc_assert (errorcount);
12865 /* Throw away the broken statement tree and extra binding
12867 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12869 while (current_binding_level->kind != sk_function_parms)
12871 if (current_binding_level->kind == sk_class)
12872 pop_nested_class ();
12874 poplevel (0, 0, 0);
12877 poplevel (1, 0, 1);
12879 /* Statements should always be full-expressions at the outermost set
12880 of curly braces for a function. */
12881 gcc_assert (stmts_are_full_exprs_p ());
12883 /* Save constexpr function body before it gets munged by
12884 the NRV transformation. */
12885 maybe_save_function_definition (fndecl);
12887 /* Set up the named return value optimization, if we can. Candidate
12888 variables are selected in check_return_expr. */
12889 if (current_function_return_value)
12891 tree r = current_function_return_value;
12894 if (r != error_mark_node
12895 /* This is only worth doing for fns that return in memory--and
12896 simpler, since we don't have to worry about promoted modes. */
12897 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12898 /* Only allow this for variables declared in the outer scope of
12899 the function so we know that their lifetime always ends with a
12900 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12901 we were to do this optimization in tree-ssa. */
12902 && (outer = outer_curly_brace_block (fndecl))
12903 && chain_member (r, BLOCK_VARS (outer)))
12904 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12906 current_function_return_value = NULL_TREE;
12909 /* Remember that we were in class scope. */
12910 if (current_class_name)
12911 ctype = current_class_type;
12913 /* Must mark the RESULT_DECL as being in this function. */
12914 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12916 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12917 to the FUNCTION_DECL node itself. */
12918 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12920 /* Save away current state, if appropriate. */
12921 if (!processing_template_decl)
12922 save_function_data (fndecl);
12924 /* Complain if there's just no return statement. */
12925 if (warn_return_type
12926 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12927 && !dependent_type_p (TREE_TYPE (fntype))
12928 && !current_function_returns_value && !current_function_returns_null
12929 /* Don't complain if we abort or throw. */
12930 && !current_function_returns_abnormally
12931 /* Don't complain if we are declared noreturn. */
12932 && !TREE_THIS_VOLATILE (fndecl)
12933 && !DECL_NAME (DECL_RESULT (fndecl))
12934 && !TREE_NO_WARNING (fndecl)
12935 /* Structor return values (if any) are set by the compiler. */
12936 && !DECL_CONSTRUCTOR_P (fndecl)
12937 && !DECL_DESTRUCTOR_P (fndecl))
12939 warning (OPT_Wreturn_type,
12940 "no return statement in function returning non-void");
12941 TREE_NO_WARNING (fndecl) = 1;
12944 /* Store the end of the function, so that we get good line number
12945 info for the epilogue. */
12946 cfun->function_end_locus = input_location;
12948 /* Complain about parameters that are only set, but never otherwise used. */
12949 if (warn_unused_but_set_parameter
12950 && !processing_template_decl
12951 && errorcount == unused_but_set_errorcount
12952 && !DECL_CLONED_FUNCTION_P (fndecl))
12956 for (decl = DECL_ARGUMENTS (fndecl);
12958 decl = DECL_CHAIN (decl))
12959 if (TREE_USED (decl)
12960 && TREE_CODE (decl) == PARM_DECL
12961 && !DECL_READ_P (decl)
12962 && DECL_NAME (decl)
12963 && !DECL_ARTIFICIAL (decl)
12964 && !TREE_NO_WARNING (decl)
12965 && !DECL_IN_SYSTEM_HEADER (decl)
12966 && TREE_TYPE (decl) != error_mark_node
12967 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
12968 && (!CLASS_TYPE_P (TREE_TYPE (decl))
12969 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
12970 warning (OPT_Wunused_but_set_parameter,
12971 "parameter %q+D set but not used", decl);
12972 unused_but_set_errorcount = errorcount;
12975 /* Genericize before inlining. */
12976 if (!processing_template_decl)
12978 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12979 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
12980 cp_genericize (fndecl);
12981 /* Clear out the bits we don't need. */
12982 f->x_current_class_ptr = NULL;
12983 f->x_current_class_ref = NULL;
12984 f->x_eh_spec_block = NULL;
12985 f->x_in_charge_parm = NULL;
12986 f->x_vtt_parm = NULL;
12987 f->x_return_value = NULL;
12988 f->bindings = NULL;
12989 f->extern_decl_map = NULL;
12991 /* Clear out the bits we don't need. */
12992 local_names = NULL;
12994 /* We're leaving the context of this function, so zap cfun. It's still in
12995 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12997 current_function_decl = NULL;
12999 /* If this is an in-class inline definition, we may have to pop the
13000 bindings for the template parameters that we added in
13001 maybe_begin_member_template_processing when start_function was
13003 if (inclass_inline)
13004 maybe_end_member_template_processing ();
13006 /* Leave the scope of the class. */
13008 pop_nested_class ();
13013 current_function_decl = NULL_TREE;
13015 defer_mark_used_calls = false;
13016 if (deferred_mark_used_calls)
13021 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13023 VEC_free (tree, gc, deferred_mark_used_calls);
13029 /* Create the FUNCTION_DECL for a function definition.
13030 DECLSPECS and DECLARATOR are the parts of the declaration;
13031 they describe the return type and the name of the function,
13032 but twisted together in a fashion that parallels the syntax of C.
13034 This function creates a binding context for the function body
13035 as well as setting up the FUNCTION_DECL in current_function_decl.
13037 Returns a FUNCTION_DECL on success.
13039 If the DECLARATOR is not suitable for a function (it defines a datum
13040 instead), we return 0, which tells yyparse to report a parse error.
13042 May return void_type_node indicating that this method is actually
13043 a friend. See grokfield for more details.
13045 Came here with a `.pushlevel' .
13047 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13048 CHANGES TO CODE IN `grokfield'. */
13051 grokmethod (cp_decl_specifier_seq *declspecs,
13052 const cp_declarator *declarator, tree attrlist)
13054 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13057 if (fndecl == error_mark_node)
13058 return error_mark_node;
13060 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13062 error ("invalid member function declaration");
13063 return error_mark_node;
13067 cplus_decl_attributes (&fndecl, attrlist, 0);
13069 /* Pass friends other than inline friend functions back. */
13070 if (fndecl == void_type_node)
13073 if (DECL_IN_AGGR_P (fndecl))
13075 if (DECL_CONTEXT (fndecl)
13076 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
13077 error ("%qD is already defined in class %qT", fndecl,
13078 DECL_CONTEXT (fndecl));
13079 return error_mark_node;
13082 check_template_shadow (fndecl);
13084 DECL_DECLARED_INLINE_P (fndecl) = 1;
13085 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13087 /* We process method specializations in finish_struct_1. */
13088 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13090 fndecl = push_template_decl (fndecl);
13091 if (fndecl == error_mark_node)
13095 if (! DECL_FRIEND_P (fndecl))
13097 if (DECL_CHAIN (fndecl))
13099 fndecl = copy_node (fndecl);
13100 TREE_CHAIN (fndecl) = NULL_TREE;
13104 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13106 DECL_IN_AGGR_P (fndecl) = 1;
13111 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13112 we can lay it out later, when and if its type becomes complete. */
13115 maybe_register_incomplete_var (tree var)
13117 gcc_assert (TREE_CODE (var) == VAR_DECL);
13119 /* Keep track of variables with incomplete types. */
13120 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13121 && DECL_EXTERNAL (var))
13123 tree inner_type = TREE_TYPE (var);
13125 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13126 inner_type = TREE_TYPE (inner_type);
13127 inner_type = TYPE_MAIN_VARIANT (inner_type);
13129 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13130 /* RTTI TD entries are created while defining the type_info. */
13131 || (TYPE_LANG_SPECIFIC (inner_type)
13132 && TYPE_BEING_DEFINED (inner_type)))
13135 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13137 iv->incomplete_type = inner_type;
13142 /* Called when a class type (given by TYPE) is defined. If there are
13143 any existing VAR_DECLs whose type has been completed by this
13144 declaration, update them now. */
13147 complete_vars (tree type)
13150 incomplete_var *iv;
13152 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13154 if (same_type_p (type, iv->incomplete_type))
13156 tree var = iv->decl;
13157 tree type = TREE_TYPE (var);
13158 /* Complete the type of the variable. The VAR_DECL itself
13159 will be laid out in expand_expr. */
13160 complete_type (type);
13161 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13162 /* Remove this entry from the list. */
13163 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13169 /* Check for pending declarations which may have abstract type. */
13170 complete_type_check_abstract (type);
13173 /* If DECL is of a type which needs a cleanup, build and return an
13174 expression to perform that cleanup here. Return NULL_TREE if no
13175 cleanup need be done. */
13178 cxx_maybe_build_cleanup (tree decl)
13184 /* Assume no cleanup is required. */
13185 cleanup = NULL_TREE;
13187 if (error_operand_p (decl))
13190 /* Handle "__attribute__((cleanup))". We run the cleanup function
13191 before the destructor since the destructor is what actually
13192 terminates the lifetime of the object. */
13193 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13200 /* Get the name specified by the user for the cleanup function. */
13201 id = TREE_VALUE (TREE_VALUE (attr));
13202 /* Look up the name to find the cleanup function to call. It is
13203 important to use lookup_name here because that is what is
13204 used in c-common.c:handle_cleanup_attribute when performing
13205 initial checks on the attribute. Note that those checks
13206 include ensuring that the function found is not an overloaded
13207 function, or an object with an overloaded call operator,
13208 etc.; we can rely on the fact that the function found is an
13209 ordinary FUNCTION_DECL. */
13210 fn = lookup_name (id);
13211 arg = build_address (decl);
13213 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13216 /* Handle ordinary C++ destructors. */
13217 type = TREE_TYPE (decl);
13218 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13220 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13221 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13222 && CLASSTYPE_VBASECLASSES (type));
13226 if (TREE_CODE (type) == ARRAY_TYPE)
13229 addr = build_address (decl);
13231 /* Optimize for space over speed here. */
13232 if (!has_vbases || flag_expensive_optimizations)
13233 flags |= LOOKUP_NONVIRTUAL;
13235 call = build_delete (TREE_TYPE (addr), addr,
13236 sfk_complete_destructor, flags, 0);
13238 cleanup = build_compound_expr (input_location, cleanup, call);
13246 /* When a stmt has been parsed, this function is called. */
13253 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13254 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13255 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13258 static_fn_type (tree memfntype)
13263 if (TYPE_PTRMEMFUNC_P (memfntype))
13264 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13265 if (POINTER_TYPE_P (memfntype)
13266 || TREE_CODE (memfntype) == FUNCTION_DECL)
13267 memfntype = TREE_TYPE (memfntype);
13268 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13270 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13271 args = TYPE_ARG_TYPES (memfntype);
13272 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13273 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13274 fntype = (cp_build_type_attribute_variant
13275 (fntype, TYPE_ATTRIBUTES (memfntype)));
13276 fntype = (build_exception_variant
13277 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13281 /* DECL was originally constructed as a non-static member function,
13282 but turned out to be static. Update it accordingly. */
13285 revert_static_member_fn (tree decl)
13287 TREE_TYPE (decl) = static_fn_type (decl);
13289 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13290 error ("static member function %q#D declared with type qualifiers", decl);
13292 if (DECL_ARGUMENTS (decl))
13293 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13294 DECL_STATIC_FUNCTION_P (decl) = 1;
13297 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13298 one of the language-independent trees. */
13300 enum cp_tree_node_structure_enum
13301 cp_tree_node_structure (union lang_tree_node * t)
13303 switch (TREE_CODE (&t->generic))
13305 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13306 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13307 case OVERLOAD: return TS_CP_OVERLOAD;
13308 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13309 case PTRMEM_CST: return TS_CP_PTRMEM;
13310 case BASELINK: return TS_CP_BASELINK;
13311 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13312 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13313 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13314 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13315 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13316 default: return TS_CP_GENERIC;
13320 /* Build the void_list_node (void_type_node having been created). */
13322 build_void_list_node (void)
13324 tree t = build_tree_list (NULL_TREE, void_type_node);
13329 cp_missing_noreturn_ok_p (tree decl)
13331 /* A missing noreturn is ok for the `main' function. */
13332 return DECL_MAIN_P (decl);
13335 /* Return the COMDAT group into which DECL should be placed. */
13338 cxx_comdat_group (tree decl)
13342 /* Virtual tables, construction virtual tables, and virtual table
13343 tables all go in a single COMDAT group, named after the primary
13345 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13346 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13347 /* For all other DECLs, the COMDAT group is the mangled name of the
13348 declaration itself. */
13351 while (DECL_THUNK_P (decl))
13353 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13354 into the same section as the target function. In that case
13355 we must return target's name. */
13356 tree target = THUNK_TARGET (decl);
13357 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13358 && DECL_SECTION_NAME (target) != NULL
13359 && DECL_ONE_ONLY (target))
13364 name = DECL_ASSEMBLER_NAME (decl);
13370 #include "gt-cp-decl.h"