1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, tree *, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, tree *);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (DECL_P (olddecl)
1207 && TREE_CODE (newdecl) == FUNCTION_DECL
1208 && TREE_CODE (olddecl) == FUNCTION_DECL
1209 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1211 if (DECL_DECLARED_INLINE_P (newdecl)
1212 && DECL_UNINLINABLE (newdecl)
1213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1214 /* Already warned elsewhere. */;
1215 else if (DECL_DECLARED_INLINE_P (olddecl)
1216 && DECL_UNINLINABLE (olddecl)
1217 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 /* Already warned. */;
1219 else if (DECL_DECLARED_INLINE_P (newdecl)
1220 && DECL_UNINLINABLE (olddecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1225 warning (OPT_Wattributes, "previous declaration of %q+D "
1226 "with attribute noinline", olddecl);
1228 else if (DECL_DECLARED_INLINE_P (olddecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1232 warning (OPT_Wattributes, "function %q+D redeclared with "
1233 "attribute noinline", newdecl);
1234 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1239 /* Check for redeclaration and other discrepancies. */
1240 if (TREE_CODE (olddecl) == FUNCTION_DECL
1241 && DECL_ARTIFICIAL (olddecl))
1243 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1244 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1246 /* Avoid warnings redeclaring built-ins which have not been
1247 explicitly declared. */
1248 if (DECL_ANTICIPATED (olddecl))
1251 /* If you declare a built-in or predefined function name as static,
1252 the old definition is overridden, but optionally warn this was a
1253 bad choice of name. */
1254 if (! TREE_PUBLIC (newdecl))
1256 warning (OPT_Wshadow,
1257 DECL_BUILT_IN (olddecl)
1258 ? G_("shadowing built-in function %q#D")
1259 : G_("shadowing library function %q#D"), olddecl);
1260 /* Discard the old built-in function. */
1263 /* If the built-in is not ansi, then programs can override
1264 it even globally without an error. */
1265 else if (! DECL_BUILT_IN (olddecl))
1266 warning (0, "library function %q#D redeclared as non-function %q#D",
1270 error ("declaration of %q#D", newdecl);
1271 error ("conflicts with built-in declaration %q#D",
1276 else if (!types_match)
1278 /* Avoid warnings redeclaring built-ins which have not been
1279 explicitly declared. */
1280 if (DECL_ANTICIPATED (olddecl))
1282 /* Deal with fileptr_type_node. FILE type is not known
1283 at the time we create the builtins. */
1286 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1287 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1289 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1292 else if (TREE_VALUE (t2) == fileptr_type_node)
1294 tree t = TREE_VALUE (t1);
1296 if (TREE_CODE (t) == POINTER_TYPE
1297 && TYPE_NAME (TREE_TYPE (t))
1298 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1299 == get_identifier ("FILE")
1300 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1302 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1305 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1306 types_match = decls_match (newdecl, olddecl);
1308 return duplicate_decls (newdecl, olddecl,
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1313 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1316 else if ((DECL_EXTERN_C_P (newdecl)
1317 && DECL_EXTERN_C_P (olddecl))
1318 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1321 /* A near match; override the builtin. */
1323 if (TREE_PUBLIC (newdecl))
1325 warning (0, "new declaration %q#D", newdecl);
1326 warning (0, "ambiguates built-in declaration %q#D",
1330 warning (OPT_Wshadow,
1331 DECL_BUILT_IN (olddecl)
1332 ? G_("shadowing built-in function %q#D")
1333 : G_("shadowing library function %q#D"), olddecl);
1336 /* Discard the old built-in function. */
1339 /* Replace the old RTL to avoid problems with inlining. */
1340 COPY_DECL_RTL (newdecl, olddecl);
1342 /* Even if the types match, prefer the new declarations type for
1343 built-ins which have not been explicitly declared, for
1344 exception lists, etc... */
1345 else if (DECL_IS_BUILTIN (olddecl))
1347 tree type = TREE_TYPE (newdecl);
1348 tree attribs = (*targetm.merge_type_attributes)
1349 (TREE_TYPE (olddecl), type);
1351 type = cp_build_type_attribute_variant (type, attribs);
1352 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1355 /* If a function is explicitly declared "throw ()", propagate that to
1356 the corresponding builtin. */
1357 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1358 && DECL_ANTICIPATED (olddecl)
1359 && TREE_NOTHROW (newdecl)
1360 && !TREE_NOTHROW (olddecl))
1362 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1363 tree tmpdecl = builtin_decl_explicit (fncode);
1364 if (tmpdecl && tmpdecl != olddecl && types_match)
1365 TREE_NOTHROW (tmpdecl) = 1;
1368 /* Whether or not the builtin can throw exceptions has no
1369 bearing on this declarator. */
1370 TREE_NOTHROW (olddecl) = 0;
1372 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1374 /* If a builtin function is redeclared as `static', merge
1375 the declarations, but make the original one static. */
1376 DECL_THIS_STATIC (olddecl) = 1;
1377 TREE_PUBLIC (olddecl) = 0;
1379 /* Make the old declaration consistent with the new one so
1380 that all remnants of the builtin-ness of this function
1381 will be banished. */
1382 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1383 COPY_DECL_RTL (newdecl, olddecl);
1386 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1388 /* C++ Standard, 3.3, clause 4:
1389 "[Note: a namespace name or a class template name must be unique
1390 in its declarative region (7.3.2, clause 14). ]" */
1391 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1392 && TREE_CODE (newdecl) != NAMESPACE_DECL
1393 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1394 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1395 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1396 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1398 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1399 && TREE_CODE (newdecl) != TYPE_DECL)
1400 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1401 && TREE_CODE (olddecl) != TYPE_DECL))
1403 /* We do nothing special here, because C++ does such nasty
1404 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1405 get shadowed, and know that if we need to find a TYPE_DECL
1406 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1407 slot of the identifier. */
1411 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1412 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1413 || (TREE_CODE (olddecl) == FUNCTION_DECL
1414 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1418 error ("%q#D redeclared as different kind of symbol", newdecl);
1419 if (TREE_CODE (olddecl) == TREE_LIST)
1420 olddecl = TREE_VALUE (olddecl);
1421 error ("previous declaration of %q+#D", olddecl);
1423 return error_mark_node;
1425 else if (!types_match)
1427 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1428 /* These are certainly not duplicate declarations; they're
1429 from different scopes. */
1432 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1434 /* The name of a class template may not be declared to refer to
1435 any other template, class, function, object, namespace, value,
1436 or type in the same scope. */
1437 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1438 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1440 error ("declaration of template %q#D", newdecl);
1441 error ("conflicts with previous declaration %q+#D", olddecl);
1443 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1444 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1445 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1446 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1447 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1448 DECL_TEMPLATE_PARMS (olddecl))
1449 /* Template functions can be disambiguated by
1451 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1452 TREE_TYPE (TREE_TYPE (olddecl))))
1454 error ("new declaration %q#D", newdecl);
1455 error ("ambiguates old declaration %q+#D", olddecl);
1459 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1461 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1463 error ("declaration of C function %q#D conflicts with",
1465 error ("previous declaration %q+#D here", olddecl);
1468 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1469 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1471 error ("new declaration %q#D", newdecl);
1472 error ("ambiguates old declaration %q+#D", olddecl);
1473 return error_mark_node;
1480 error ("conflicting declaration %q#D", newdecl);
1481 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1482 return error_mark_node;
1485 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1486 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1487 && (!DECL_TEMPLATE_INFO (newdecl)
1488 || (DECL_TI_TEMPLATE (newdecl)
1489 != DECL_TI_TEMPLATE (olddecl))))
1490 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1491 && (!DECL_TEMPLATE_INFO (olddecl)
1492 || (DECL_TI_TEMPLATE (olddecl)
1493 != DECL_TI_TEMPLATE (newdecl))))))
1494 /* It's OK to have a template specialization and a non-template
1495 with the same type, or to have specializations of two
1496 different templates with the same type. Note that if one is a
1497 specialization, and the other is an instantiation of the same
1498 template, that we do not exit at this point. That situation
1499 can occur if we instantiate a template class, and then
1500 specialize one of its methods. This situation is valid, but
1501 the declarations must be merged in the usual way. */
1503 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1504 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1505 && !DECL_USE_TEMPLATE (newdecl))
1506 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1507 && !DECL_USE_TEMPLATE (olddecl))))
1508 /* One of the declarations is a template instantiation, and the
1509 other is not a template at all. That's OK. */
1511 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1513 /* In [namespace.alias] we have:
1515 In a declarative region, a namespace-alias-definition can be
1516 used to redefine a namespace-alias declared in that declarative
1517 region to refer only to the namespace to which it already
1520 Therefore, if we encounter a second alias directive for the same
1521 alias, we can just ignore the second directive. */
1522 if (DECL_NAMESPACE_ALIAS (newdecl)
1523 && (DECL_NAMESPACE_ALIAS (newdecl)
1524 == DECL_NAMESPACE_ALIAS (olddecl)))
1526 /* [namespace.alias]
1528 A namespace-name or namespace-alias shall not be declared as
1529 the name of any other entity in the same declarative region.
1530 A namespace-name defined at global scope shall not be
1531 declared as the name of any other entity in any global scope
1533 error ("declaration of namespace %qD conflicts with", newdecl);
1534 error ("previous declaration of namespace %q+D here", olddecl);
1535 return error_mark_node;
1539 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1542 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1543 if (DECL_NAME (olddecl) != NULL_TREE)
1544 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1545 ? G_("%q+#D previously defined here")
1546 : G_("%q+#D previously declared here"), olddecl);
1547 return error_mark_node;
1549 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1550 && DECL_INITIAL (olddecl) != NULL_TREE
1551 && !prototype_p (TREE_TYPE (olddecl))
1552 && prototype_p (TREE_TYPE (newdecl)))
1554 /* Prototype decl follows defn w/o prototype. */
1555 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1556 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1557 "follows non-prototype definition here");
1559 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1560 || TREE_CODE (olddecl) == VAR_DECL)
1561 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1564 If two declarations of the same function or object
1565 specify different linkage-specifications ..., the program
1566 is ill-formed.... Except for functions with C++ linkage,
1567 a function declaration without a linkage specification
1568 shall not precede the first linkage specification for
1569 that function. A function can be declared without a
1570 linkage specification after an explicit linkage
1571 specification has been seen; the linkage explicitly
1572 specified in the earlier declaration is not affected by
1573 such a function declaration.
1575 DR 563 raises the question why the restrictions on
1576 functions should not also apply to objects. Older
1577 versions of G++ silently ignore the linkage-specification
1585 which is clearly wrong. Therefore, we now treat objects
1587 if (current_lang_depth () == 0)
1589 /* There is no explicit linkage-specification, so we use
1590 the linkage from the previous declaration. */
1591 if (!DECL_LANG_SPECIFIC (newdecl))
1592 retrofit_lang_decl (newdecl);
1593 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1597 error ("previous declaration of %q+#D with %qL linkage",
1598 olddecl, DECL_LANGUAGE (olddecl));
1599 error ("conflicts with new declaration with %qL linkage",
1600 DECL_LANGUAGE (newdecl));
1604 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1606 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1608 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1609 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1612 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1613 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1615 for (; t1 && t1 != void_list_node;
1616 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1617 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1619 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1622 permerror (input_location, "default argument given for parameter %d of %q#D",
1624 permerror (input_location, "after previous specification in %q+#D", olddecl);
1628 error ("default argument given for parameter %d of %q#D",
1630 error ("after previous specification in %q+#D",
1637 /* Do not merge an implicit typedef with an explicit one. In:
1641 typedef class A A __attribute__ ((foo));
1643 the attribute should apply only to the typedef. */
1644 if (TREE_CODE (olddecl) == TYPE_DECL
1645 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1646 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1649 /* If new decl is `static' and an `extern' was seen previously,
1651 warn_extern_redeclared_static (newdecl, olddecl);
1653 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1654 return error_mark_node;
1656 /* We have committed to returning 1 at this point. */
1657 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1659 /* Now that functions must hold information normally held
1660 by field decls, there is extra work to do so that
1661 declaration information does not get destroyed during
1663 if (DECL_VINDEX (olddecl))
1664 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1665 if (DECL_CONTEXT (olddecl))
1666 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1667 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1668 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1669 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1670 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1671 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1672 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1673 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1674 SET_OVERLOADED_OPERATOR_CODE
1675 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1676 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1678 /* Optionally warn about more than one declaration for the same
1679 name, but don't warn about a function declaration followed by a
1681 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1682 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1683 /* Don't warn about extern decl followed by definition. */
1684 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1685 /* Don't warn about friends, let add_friend take care of it. */
1686 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1688 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1689 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1692 if (DECL_DELETED_FN (newdecl))
1694 error ("deleted definition of %qD", newdecl);
1695 error ("after previous declaration %q+D", olddecl);
1697 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1700 /* Deal with C++: must preserve virtual function table size. */
1701 if (TREE_CODE (olddecl) == TYPE_DECL)
1703 tree newtype = TREE_TYPE (newdecl);
1704 tree oldtype = TREE_TYPE (olddecl);
1706 if (newtype != error_mark_node && oldtype != error_mark_node
1707 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1708 CLASSTYPE_FRIEND_CLASSES (newtype)
1709 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1711 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1714 /* Copy all the DECL_... slots specified in the new decl
1715 except for any that we copy here from the old type. */
1716 DECL_ATTRIBUTES (newdecl)
1717 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1719 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1723 old_result = DECL_TEMPLATE_RESULT (olddecl);
1724 new_result = DECL_TEMPLATE_RESULT (newdecl);
1725 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1726 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1727 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1728 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1730 DECL_ATTRIBUTES (old_result)
1731 = (*targetm.merge_decl_attributes) (old_result, new_result);
1733 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1735 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1736 && DECL_INITIAL (new_result))
1738 if (DECL_INITIAL (old_result))
1739 DECL_UNINLINABLE (old_result) = 1;
1741 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1742 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1743 DECL_NOT_REALLY_EXTERN (old_result)
1744 = DECL_NOT_REALLY_EXTERN (new_result);
1745 DECL_INTERFACE_KNOWN (old_result)
1746 = DECL_INTERFACE_KNOWN (new_result);
1747 DECL_DECLARED_INLINE_P (old_result)
1748 = DECL_DECLARED_INLINE_P (new_result);
1749 DECL_DISREGARD_INLINE_LIMITS (old_result)
1750 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1755 DECL_DECLARED_INLINE_P (old_result)
1756 |= DECL_DECLARED_INLINE_P (new_result);
1757 DECL_DISREGARD_INLINE_LIMITS (old_result)
1758 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1759 check_redeclaration_exception_specification (newdecl, olddecl);
1763 /* If the new declaration is a definition, update the file and
1764 line information on the declaration, and also make
1765 the old declaration the same definition. */
1766 if (DECL_INITIAL (new_result) != NULL_TREE)
1768 DECL_SOURCE_LOCATION (olddecl)
1769 = DECL_SOURCE_LOCATION (old_result)
1770 = DECL_SOURCE_LOCATION (newdecl);
1771 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1772 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1775 DECL_ARGUMENTS (old_result)
1776 = DECL_ARGUMENTS (new_result);
1777 for (parm = DECL_ARGUMENTS (old_result); parm;
1778 parm = DECL_CHAIN (parm))
1779 DECL_CONTEXT (parm) = old_result;
1788 /* Automatically handles default parameters. */
1789 tree oldtype = TREE_TYPE (olddecl);
1792 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1793 maybe_instantiate_noexcept (olddecl);
1795 /* Merge the data types specified in the two decls. */
1796 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1798 /* If merge_types produces a non-typedef type, just use the old type. */
1799 if (TREE_CODE (newdecl) == TYPE_DECL
1800 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1803 if (TREE_CODE (newdecl) == VAR_DECL)
1805 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1806 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1807 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1808 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1809 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1810 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1812 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1813 if (DECL_LANG_SPECIFIC (olddecl)
1814 && CP_DECL_THREADPRIVATE_P (olddecl))
1816 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1817 if (!DECL_LANG_SPECIFIC (newdecl))
1818 retrofit_lang_decl (newdecl);
1820 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1821 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1825 /* Do this after calling `merge_types' so that default
1826 parameters don't confuse us. */
1827 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1828 check_redeclaration_exception_specification (newdecl, olddecl);
1829 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1831 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1832 check_default_args (newdecl);
1834 /* Lay the type out, unless already done. */
1835 if (! same_type_p (newtype, oldtype)
1836 && TREE_TYPE (newdecl) != error_mark_node
1837 && !(processing_template_decl && uses_template_parms (newdecl)))
1838 layout_type (TREE_TYPE (newdecl));
1840 if ((TREE_CODE (newdecl) == VAR_DECL
1841 || TREE_CODE (newdecl) == PARM_DECL
1842 || TREE_CODE (newdecl) == RESULT_DECL
1843 || TREE_CODE (newdecl) == FIELD_DECL
1844 || TREE_CODE (newdecl) == TYPE_DECL)
1845 && !(processing_template_decl && uses_template_parms (newdecl)))
1846 layout_decl (newdecl, 0);
1848 /* Merge the type qualifiers. */
1849 if (TREE_READONLY (newdecl))
1850 TREE_READONLY (olddecl) = 1;
1851 if (TREE_THIS_VOLATILE (newdecl))
1852 TREE_THIS_VOLATILE (olddecl) = 1;
1853 if (TREE_NOTHROW (newdecl))
1854 TREE_NOTHROW (olddecl) = 1;
1856 /* Merge deprecatedness. */
1857 if (TREE_DEPRECATED (newdecl))
1858 TREE_DEPRECATED (olddecl) = 1;
1860 /* Preserve function specific target and optimization options */
1861 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1863 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1864 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1865 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1866 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1868 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1869 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1870 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1871 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1874 /* Merge the initialization information. */
1875 if (DECL_INITIAL (newdecl) == NULL_TREE
1876 && DECL_INITIAL (olddecl) != NULL_TREE)
1878 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1879 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1880 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1882 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1883 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1887 /* Merge the section attribute.
1888 We want to issue an error if the sections conflict but that must be
1889 done later in decl_attributes since we are called before attributes
1891 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1892 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1894 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1896 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1897 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1898 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1899 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1900 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1901 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1902 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1903 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1904 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1905 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1906 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1907 /* Keep the old RTL. */
1908 COPY_DECL_RTL (olddecl, newdecl);
1910 else if (TREE_CODE (newdecl) == VAR_DECL
1911 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1913 /* Keep the old RTL. We cannot keep the old RTL if the old
1914 declaration was for an incomplete object and the new
1915 declaration is not since many attributes of the RTL will
1917 COPY_DECL_RTL (olddecl, newdecl);
1920 /* If cannot merge, then use the new type and qualifiers,
1921 and don't preserve the old rtl. */
1924 /* Clean out any memory we had of the old declaration. */
1925 tree oldstatic = value_member (olddecl, static_aggregates);
1927 TREE_VALUE (oldstatic) = error_mark_node;
1929 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1930 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1931 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1932 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1935 /* Merge the storage class information. */
1936 merge_weak (newdecl, olddecl);
1938 if (DECL_ONE_ONLY (olddecl))
1939 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1941 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1942 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1943 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1944 if (! DECL_EXTERNAL (olddecl))
1945 DECL_EXTERNAL (newdecl) = 0;
1947 new_template_info = NULL_TREE;
1948 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1950 bool new_redefines_gnu_inline = false;
1952 if (new_defines_function
1953 && ((DECL_INTERFACE_KNOWN (olddecl)
1954 && TREE_CODE (olddecl) == FUNCTION_DECL)
1955 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1956 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1957 == FUNCTION_DECL))))
1961 if (TREE_CODE (fn) == TEMPLATE_DECL)
1962 fn = DECL_TEMPLATE_RESULT (olddecl);
1964 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1967 if (!new_redefines_gnu_inline)
1969 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1970 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1971 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1973 DECL_TEMPLATE_INSTANTIATED (newdecl)
1974 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1975 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1977 /* If the OLDDECL is an instantiation and/or specialization,
1978 then the NEWDECL must be too. But, it may not yet be marked
1979 as such if the caller has created NEWDECL, but has not yet
1980 figured out that it is a redeclaration. */
1981 if (!DECL_USE_TEMPLATE (newdecl))
1982 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1984 /* Don't really know how much of the language-specific
1985 values we should copy from old to new. */
1986 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1987 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1988 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1989 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1991 if (LANG_DECL_HAS_MIN (newdecl))
1993 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1994 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1995 if (DECL_TEMPLATE_INFO (newdecl))
1996 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1997 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1999 /* Only functions have these fields. */
2000 if (TREE_CODE (newdecl) == FUNCTION_DECL
2001 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2003 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2004 olddecl_friend = DECL_FRIEND_P (olddecl);
2005 hidden_friend = (DECL_ANTICIPATED (olddecl)
2006 && DECL_HIDDEN_FRIEND_P (olddecl)
2007 && newdecl_is_friend);
2008 DECL_BEFRIENDING_CLASSES (newdecl)
2009 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2010 DECL_BEFRIENDING_CLASSES (olddecl));
2011 /* DECL_THUNKS is only valid for virtual functions,
2012 otherwise it is a DECL_FRIEND_CONTEXT. */
2013 if (DECL_VIRTUAL_P (newdecl))
2014 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2016 /* Only variables have this field. */
2017 else if (TREE_CODE (newdecl) == VAR_DECL
2018 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2019 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2022 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2026 /* Merge parameter attributes. */
2027 tree oldarg, newarg;
2028 for (oldarg = DECL_ARGUMENTS(olddecl),
2029 newarg = DECL_ARGUMENTS(newdecl);
2031 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2032 DECL_ATTRIBUTES (newarg)
2033 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2034 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2037 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2038 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2040 /* If newdecl is not a specialization, then it is not a
2041 template-related function at all. And that means that we
2042 should have exited above, returning 0. */
2043 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2045 if (DECL_ODR_USED (olddecl))
2046 /* From [temp.expl.spec]:
2048 If a template, a member template or the member of a class
2049 template is explicitly specialized then that
2050 specialization shall be declared before the first use of
2051 that specialization that would cause an implicit
2052 instantiation to take place, in every translation unit in
2053 which such a use occurs. */
2054 error ("explicit specialization of %qD after first use",
2057 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2059 /* Don't propagate visibility from the template to the
2060 specialization here. We'll do that in determine_visibility if
2062 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2064 /* [temp.expl.spec/14] We don't inline explicit specialization
2065 just because the primary template says so. */
2067 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2068 the always_inline attribute. */
2069 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2070 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2072 if (DECL_DECLARED_INLINE_P (newdecl))
2073 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2075 DECL_ATTRIBUTES (newdecl)
2076 = remove_attribute ("always_inline",
2077 DECL_ATTRIBUTES (newdecl));
2080 else if (new_defines_function && DECL_INITIAL (olddecl))
2082 /* Never inline re-defined extern inline functions.
2083 FIXME: this could be better handled by keeping both
2084 function as separate declarations. */
2085 DECL_UNINLINABLE (newdecl) = 1;
2089 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2090 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2092 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2094 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2095 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2097 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2098 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2099 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2100 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2103 /* Preserve abstractness on cloned [cd]tors. */
2104 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2106 /* Update newdecl's parms to point at olddecl. */
2107 for (parm = DECL_ARGUMENTS (newdecl); parm;
2108 parm = DECL_CHAIN (parm))
2109 DECL_CONTEXT (parm) = olddecl;
2113 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2114 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2115 COPY_DECL_RTL (newdecl, olddecl);
2117 if (! types_match || new_defines_function)
2119 /* These need to be copied so that the names are available.
2120 Note that if the types do match, we'll preserve inline
2121 info and other bits, but if not, we won't. */
2122 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2123 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2125 if (new_defines_function)
2126 /* If defining a function declared with other language
2127 linkage, use the previously declared language linkage. */
2128 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2129 else if (types_match)
2131 /* If redeclaring a builtin function, and not a definition,
2132 it stays built in. */
2133 if (DECL_BUILT_IN (olddecl))
2135 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2136 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2137 /* If we're keeping the built-in definition, keep the rtl,
2138 regardless of declaration matches. */
2139 COPY_DECL_RTL (olddecl, newdecl);
2140 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2142 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2145 /* If a compatible prototype of these builtin functions
2146 is seen, assume the runtime implements it with the
2147 expected semantics. */
2148 case BUILT_IN_STPCPY:
2149 if (builtin_decl_explicit_p (fncode))
2150 set_builtin_decl_implicit_p (fncode, true);
2158 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2159 /* Don't clear out the arguments if we're just redeclaring a
2161 if (DECL_ARGUMENTS (olddecl))
2162 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2165 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2166 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2168 /* Now preserve various other info from the definition. */
2169 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2170 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2171 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2172 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2174 /* Warn about conflicting visibility specifications. */
2175 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2176 && DECL_VISIBILITY_SPECIFIED (newdecl)
2177 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2179 warning_at (input_location, OPT_Wattributes,
2180 "%q+D: visibility attribute ignored because it", newdecl);
2181 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2182 "conflicts with previous declaration here");
2184 /* Choose the declaration which specified visibility. */
2185 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2187 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2188 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2190 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2191 so keep this behavior. */
2192 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2194 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2195 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2197 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2198 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2199 if (TREE_CODE (newdecl) == FIELD_DECL)
2200 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2202 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2203 with that from NEWDECL below. */
2204 if (DECL_LANG_SPECIFIC (olddecl))
2206 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2207 != DECL_LANG_SPECIFIC (newdecl));
2208 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2211 /* Merge the USED information. */
2212 if (TREE_USED (olddecl))
2213 TREE_USED (newdecl) = 1;
2214 else if (TREE_USED (newdecl))
2215 TREE_USED (olddecl) = 1;
2216 if (TREE_CODE (newdecl) == VAR_DECL)
2218 if (DECL_READ_P (olddecl))
2219 DECL_READ_P (newdecl) = 1;
2220 else if (DECL_READ_P (newdecl))
2221 DECL_READ_P (olddecl) = 1;
2223 if (DECL_PRESERVE_P (olddecl))
2224 DECL_PRESERVE_P (newdecl) = 1;
2225 else if (DECL_PRESERVE_P (newdecl))
2226 DECL_PRESERVE_P (olddecl) = 1;
2228 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2232 function_size = sizeof (struct tree_decl_common);
2234 memcpy ((char *) olddecl + sizeof (struct tree_common),
2235 (char *) newdecl + sizeof (struct tree_common),
2236 function_size - sizeof (struct tree_common));
2238 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2239 (char *) newdecl + sizeof (struct tree_decl_common),
2240 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2241 if (new_template_info)
2242 /* If newdecl is a template instantiation, it is possible that
2243 the following sequence of events has occurred:
2245 o A friend function was declared in a class template. The
2246 class template was instantiated.
2248 o The instantiation of the friend declaration was
2249 recorded on the instantiation list, and is newdecl.
2251 o Later, however, instantiate_class_template called pushdecl
2252 on the newdecl to perform name injection. But, pushdecl in
2253 turn called duplicate_decls when it discovered that another
2254 declaration of a global function with the same name already
2257 o Here, in duplicate_decls, we decided to clobber newdecl.
2259 If we're going to do that, we'd better make sure that
2260 olddecl, and not newdecl, is on the list of
2261 instantiations so that if we try to do the instantiation
2262 again we won't get the clobbered declaration. */
2263 reregister_specialization (newdecl,
2269 size_t size = tree_code_size (TREE_CODE (olddecl));
2270 memcpy ((char *) olddecl + sizeof (struct tree_common),
2271 (char *) newdecl + sizeof (struct tree_common),
2272 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2273 switch (TREE_CODE (olddecl))
2283 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2284 (char *) newdecl + sizeof (struct tree_decl_common),
2285 size - sizeof (struct tree_decl_common)
2286 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2290 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2291 (char *) newdecl + sizeof (struct tree_decl_common),
2292 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2293 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2297 DECL_UID (olddecl) = olddecl_uid;
2299 DECL_FRIEND_P (olddecl) = 1;
2302 DECL_ANTICIPATED (olddecl) = 1;
2303 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2306 /* NEWDECL contains the merged attribute lists.
2307 Update OLDDECL to be the same. */
2308 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2310 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2311 so that encode_section_info has a chance to look at the new decl
2312 flags and attributes. */
2313 if (DECL_RTL_SET_P (olddecl)
2314 && (TREE_CODE (olddecl) == FUNCTION_DECL
2315 || (TREE_CODE (olddecl) == VAR_DECL
2316 && TREE_STATIC (olddecl))))
2317 make_decl_rtl (olddecl);
2319 /* The NEWDECL will no longer be needed. Because every out-of-class
2320 declaration of a member results in a call to duplicate_decls,
2321 freeing these nodes represents in a significant savings. */
2327 /* Return zero if the declaration NEWDECL is valid
2328 when the declaration OLDDECL (assumed to be for the same name)
2329 has already been seen.
2330 Otherwise return an error message format string with a %s
2331 where the identifier should go. */
2334 redeclaration_error_message (tree newdecl, tree olddecl)
2336 if (TREE_CODE (newdecl) == TYPE_DECL)
2338 /* Because C++ can put things into name space for free,
2339 constructs like "typedef struct foo { ... } foo"
2340 would look like an erroneous redeclaration. */
2341 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2344 return G_("redefinition of %q#D");
2346 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2348 /* If this is a pure function, its olddecl will actually be
2349 the original initialization to `0' (which we force to call
2350 abort()). Don't complain about redefinition in this case. */
2351 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2352 && DECL_INITIAL (olddecl) == NULL_TREE)
2355 /* If both functions come from different namespaces, this is not
2356 a redeclaration - this is a conflict with a used function. */
2357 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2358 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2359 && ! decls_match (olddecl, newdecl))
2360 return G_("%qD conflicts with used function");
2362 /* We'll complain about linkage mismatches in
2363 warn_extern_redeclared_static. */
2365 /* Defining the same name twice is no good. */
2366 if (DECL_INITIAL (olddecl) != NULL_TREE
2367 && DECL_INITIAL (newdecl) != NULL_TREE)
2369 if (DECL_NAME (olddecl) == NULL_TREE)
2370 return G_("%q#D not declared in class");
2371 else if (!GNU_INLINE_P (olddecl)
2372 || GNU_INLINE_P (newdecl))
2373 return G_("redefinition of %q#D");
2376 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2378 bool olda = GNU_INLINE_P (olddecl);
2379 bool newa = GNU_INLINE_P (newdecl);
2384 return G_("%q+D redeclared inline with "
2385 "%<gnu_inline%> attribute");
2387 return G_("%q+D redeclared inline without "
2388 "%<gnu_inline%> attribute");
2394 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2398 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2400 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2401 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2402 return G_("redefinition of %q#D");
2406 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2407 || (DECL_TEMPLATE_RESULT (newdecl)
2408 == DECL_TEMPLATE_RESULT (olddecl)))
2411 nt = DECL_TEMPLATE_RESULT (newdecl);
2412 if (DECL_TEMPLATE_INFO (nt))
2413 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2414 ot = DECL_TEMPLATE_RESULT (olddecl);
2415 if (DECL_TEMPLATE_INFO (ot))
2416 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2417 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2418 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2419 return G_("redefinition of %q#D");
2421 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2423 bool olda = GNU_INLINE_P (ot);
2424 bool newa = GNU_INLINE_P (nt);
2429 return G_("%q+D redeclared inline with "
2430 "%<gnu_inline%> attribute");
2432 return G_("%q+D redeclared inline without "
2433 "%<gnu_inline%> attribute");
2437 /* Core issue #226 (C++0x):
2439 If a friend function template declaration specifies a
2440 default template-argument, that declaration shall be a
2441 definition and shall be the only declaration of the
2442 function template in the translation unit. */
2443 if ((cxx_dialect != cxx98)
2444 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2445 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2446 /*is_primary=*/1, /*is_partial=*/0,
2447 /*is_friend_decl=*/2))
2448 return G_("redeclaration of friend %q#D "
2449 "may not have default template arguments");
2453 else if (TREE_CODE (newdecl) == VAR_DECL
2454 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2455 && (! DECL_LANG_SPECIFIC (olddecl)
2456 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2457 || DECL_THREAD_LOCAL_P (newdecl)))
2459 /* Only variables can be thread-local, and all declarations must
2460 agree on this property. */
2461 if (DECL_THREAD_LOCAL_P (newdecl))
2462 return G_("thread-local declaration of %q#D follows "
2463 "non-thread-local declaration");
2465 return G_("non-thread-local declaration of %q#D follows "
2466 "thread-local declaration");
2468 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2470 /* The objects have been declared at namespace scope. If either
2471 is a member of an anonymous union, then this is an invalid
2472 redeclaration. For example:
2478 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2479 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2480 return G_("redeclaration of %q#D");
2481 /* If at least one declaration is a reference, there is no
2482 conflict. For example:
2488 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2490 /* Reject two definitions. */
2491 return G_("redefinition of %q#D");
2495 /* Objects declared with block scope: */
2496 /* Reject two definitions, and reject a definition
2497 together with an external reference. */
2498 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2499 return G_("redeclaration of %q#D");
2504 /* Hash and equality functions for the named_label table. */
2507 named_label_entry_hash (const void *data)
2509 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2510 return DECL_UID (ent->label_decl);
2514 named_label_entry_eq (const void *a, const void *b)
2516 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2517 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2518 return ent_a->label_decl == ent_b->label_decl;
2521 /* Create a new label, named ID. */
2524 make_label_decl (tree id, int local_p)
2526 struct named_label_entry *ent;
2530 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2532 DECL_CONTEXT (decl) = current_function_decl;
2533 DECL_MODE (decl) = VOIDmode;
2534 C_DECLARED_LABEL_FLAG (decl) = local_p;
2536 /* Say where one reference is to the label, for the sake of the
2537 error if it is not defined. */
2538 DECL_SOURCE_LOCATION (decl) = input_location;
2540 /* Record the fact that this identifier is bound to this label. */
2541 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2543 /* Create the label htab for the function on demand. */
2545 named_labels = htab_create_ggc (13, named_label_entry_hash,
2546 named_label_entry_eq, NULL);
2548 /* Record this label on the list of labels used in this function.
2549 We do this before calling make_label_decl so that we get the
2550 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2551 ent = ggc_alloc_cleared_named_label_entry ();
2552 ent->label_decl = decl;
2554 slot = htab_find_slot (named_labels, ent, INSERT);
2555 gcc_assert (*slot == NULL);
2561 /* Look for a label named ID in the current function. If one cannot
2562 be found, create one. (We keep track of used, but undefined,
2563 labels, and complain about them at the end of a function.) */
2566 lookup_label_1 (tree id)
2570 /* You can't use labels at global scope. */
2571 if (current_function_decl == NULL_TREE)
2573 error ("label %qE referenced outside of any function", id);
2577 /* See if we've already got this label. */
2578 decl = IDENTIFIER_LABEL_VALUE (id);
2579 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2582 decl = make_label_decl (id, /*local_p=*/0);
2586 /* Wrapper for lookup_label_1. */
2589 lookup_label (tree id)
2592 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2593 ret = lookup_label_1 (id);
2594 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2598 /* Declare a local label named ID. */
2601 declare_local_label (tree id)
2604 cp_label_binding *bind;
2606 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2607 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2608 bind = VEC_safe_push (cp_label_binding, gc,
2609 current_binding_level->shadowed_labels, NULL);
2610 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2612 decl = make_label_decl (id, /*local_p=*/1);
2618 /* Returns nonzero if it is ill-formed to jump past the declaration of
2619 DECL. Returns 2 if it's also a real problem. */
2622 decl_jump_unsafe (tree decl)
2624 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2625 with automatic storage duration is not in scope to a point where it is
2626 in scope is ill-formed unless the variable has scalar type, class type
2627 with a trivial default constructor and a trivial destructor, a
2628 cv-qualified version of one of these types, or an array of one of the
2629 preceding types and is declared without an initializer (8.5). */
2630 tree type = TREE_TYPE (decl);
2632 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2633 || type == error_mark_node)
2636 type = strip_array_types (type);
2638 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2639 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2642 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2648 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2651 identify_goto (tree decl, const location_t *locus)
2654 permerror (input_location, "jump to label %qD", decl);
2656 permerror (input_location, "jump to case label");
2658 permerror (*locus, " from here");
2661 /* Check that a single previously seen jump to a newly defined label
2662 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2663 the jump context; NAMES are the names in scope in LEVEL at the jump
2664 context; LOCUS is the source position of the jump or 0. Returns
2665 true if all is well. */
2668 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2669 bool exited_omp, const location_t *locus)
2671 cp_binding_level *b;
2672 bool identified = false, saw_eh = false, saw_omp = false;
2676 identify_goto (decl, locus);
2677 error (" exits OpenMP structured block");
2678 identified = saw_omp = true;
2681 for (b = current_binding_level; b ; b = b->level_chain)
2683 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2685 for (new_decls = b->names; new_decls != old_decls;
2686 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2687 : TREE_CHAIN (new_decls)))
2689 int problem = decl_jump_unsafe (new_decls);
2695 identify_goto (decl, locus);
2699 error (" crosses initialization of %q+#D", new_decls);
2701 permerror (input_location, " enters scope of %q+#D which has "
2702 "non-trivial destructor", new_decls);
2707 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2711 identify_goto (decl, locus);
2714 if (b->kind == sk_try)
2715 error (" enters try block");
2717 error (" enters catch block");
2720 if (b->kind == sk_omp && !saw_omp)
2724 identify_goto (decl, locus);
2727 error (" enters OpenMP structured block");
2736 check_previous_goto (tree decl, struct named_label_use_entry *use)
2738 check_previous_goto_1 (decl, use->binding_level,
2739 use->names_in_scope, use->in_omp_scope,
2740 &use->o_goto_locus);
2744 check_switch_goto (cp_binding_level* level)
2746 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2749 /* Check that a new jump to a label DECL is OK. Called by
2750 finish_goto_stmt. */
2753 check_goto (tree decl)
2755 struct named_label_entry *ent, dummy;
2756 bool saw_catch = false, identified = false;
2760 /* We can't know where a computed goto is jumping.
2761 So we assume that it's OK. */
2762 if (TREE_CODE (decl) != LABEL_DECL)
2765 /* We didn't record any information about this label when we created it,
2766 and there's not much point since it's trivial to analyze as a return. */
2767 if (decl == cdtor_label)
2770 dummy.label_decl = decl;
2771 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2772 gcc_assert (ent != NULL);
2774 /* If the label hasn't been defined yet, defer checking. */
2775 if (! DECL_INITIAL (decl))
2777 struct named_label_use_entry *new_use;
2779 /* Don't bother creating another use if the last goto had the
2780 same data, and will therefore create the same set of errors. */
2782 && ent->uses->names_in_scope == current_binding_level->names)
2785 new_use = ggc_alloc_named_label_use_entry ();
2786 new_use->binding_level = current_binding_level;
2787 new_use->names_in_scope = current_binding_level->names;
2788 new_use->o_goto_locus = input_location;
2789 new_use->in_omp_scope = false;
2791 new_use->next = ent->uses;
2792 ent->uses = new_use;
2796 if (ent->in_try_scope || ent->in_catch_scope
2797 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2799 permerror (input_location, "jump to label %q+D", decl);
2800 permerror (input_location, " from here");
2804 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2806 int u = decl_jump_unsafe (bad);
2808 if (u > 1 && DECL_ARTIFICIAL (bad))
2810 /* Can't skip init of __exception_info. */
2811 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2815 error (" skips initialization of %q+#D", bad);
2817 permerror (input_location, " enters scope of %q+#D which has "
2818 "non-trivial destructor", bad);
2821 if (ent->in_try_scope)
2822 error (" enters try block");
2823 else if (ent->in_catch_scope && !saw_catch)
2824 error (" enters catch block");
2826 if (ent->in_omp_scope)
2827 error (" enters OpenMP structured block");
2828 else if (flag_openmp)
2830 cp_binding_level *b;
2831 for (b = current_binding_level; b ; b = b->level_chain)
2833 if (b == ent->binding_level)
2835 if (b->kind == sk_omp)
2839 permerror (input_location, "jump to label %q+D", decl);
2840 permerror (input_location, " from here");
2843 error (" exits OpenMP structured block");
2850 /* Check that a return is ok wrt OpenMP structured blocks.
2851 Called by finish_return_stmt. Returns true if all is well. */
2854 check_omp_return (void)
2856 cp_binding_level *b;
2857 for (b = current_binding_level; b ; b = b->level_chain)
2858 if (b->kind == sk_omp)
2860 error ("invalid exit from OpenMP structured block");
2863 else if (b->kind == sk_function_parms)
2868 /* Define a label, specifying the location in the source file.
2869 Return the LABEL_DECL node for the label. */
2872 define_label_1 (location_t location, tree name)
2874 struct named_label_entry *ent, dummy;
2875 cp_binding_level *p;
2878 decl = lookup_label (name);
2880 dummy.label_decl = decl;
2881 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2882 gcc_assert (ent != NULL);
2884 /* After labels, make any new cleanups in the function go into their
2885 own new (temporary) binding contour. */
2886 for (p = current_binding_level;
2887 p->kind != sk_function_parms;
2889 p->more_cleanups_ok = 0;
2891 if (name == get_identifier ("wchar_t"))
2892 permerror (input_location, "label named wchar_t");
2894 if (DECL_INITIAL (decl) != NULL_TREE)
2896 error ("duplicate label %qD", decl);
2897 return error_mark_node;
2901 struct named_label_use_entry *use;
2903 /* Mark label as having been defined. */
2904 DECL_INITIAL (decl) = error_mark_node;
2905 /* Say where in the source. */
2906 DECL_SOURCE_LOCATION (decl) = location;
2908 ent->binding_level = current_binding_level;
2909 ent->names_in_scope = current_binding_level->names;
2911 for (use = ent->uses; use ; use = use->next)
2912 check_previous_goto (decl, use);
2919 /* Wrapper for define_label_1. */
2922 define_label (location_t location, tree name)
2925 timevar_start (TV_NAME_LOOKUP);
2926 ret = define_label_1 (location, name);
2927 timevar_stop (TV_NAME_LOOKUP);
2934 cp_binding_level *level;
2935 struct cp_switch *next;
2936 /* The SWITCH_STMT being built. */
2938 /* A splay-tree mapping the low element of a case range to the high
2939 element, or NULL_TREE if there is no high element. Used to
2940 determine whether or not a new case label duplicates an old case
2941 label. We need a tree, rather than simply a hash table, because
2942 of the GNU case range extension. */
2946 /* A stack of the currently active switch statements. The innermost
2947 switch statement is on the top of the stack. There is no need to
2948 mark the stack for garbage collection because it is only active
2949 during the processing of the body of a function, and we never
2950 collect at that point. */
2952 static struct cp_switch *switch_stack;
2954 /* Called right after a switch-statement condition is parsed.
2955 SWITCH_STMT is the switch statement being parsed. */
2958 push_switch (tree switch_stmt)
2960 struct cp_switch *p = XNEW (struct cp_switch);
2961 p->level = current_binding_level;
2962 p->next = switch_stack;
2963 p->switch_stmt = switch_stmt;
2964 p->cases = splay_tree_new (case_compare, NULL, NULL);
2971 struct cp_switch *cs = switch_stack;
2972 location_t switch_location;
2974 /* Emit warnings as needed. */
2975 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2976 if (!processing_template_decl)
2977 c_do_switch_warnings (cs->cases, switch_location,
2978 SWITCH_STMT_TYPE (cs->switch_stmt),
2979 SWITCH_STMT_COND (cs->switch_stmt));
2981 splay_tree_delete (cs->cases);
2982 switch_stack = switch_stack->next;
2986 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2987 condition. Note that if TYPE and VALUE are already integral we don't
2988 really do the conversion because the language-independent
2989 warning/optimization code will work better that way. */
2992 case_conversion (tree type, tree value)
2994 if (value == NULL_TREE)
2997 if (cxx_dialect >= cxx0x
2998 && (SCOPED_ENUM_P (type)
2999 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3001 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3002 type = type_promotes_to (type);
3003 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3005 return cxx_constant_value (value);
3008 /* Note that we've seen a definition of a case label, and complain if this
3009 is a bad place for one. */
3012 finish_case_label (location_t loc, tree low_value, tree high_value)
3015 cp_binding_level *p;
3018 if (processing_template_decl)
3022 /* For templates, just add the case label; we'll do semantic
3023 analysis at instantiation-time. */
3024 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3025 return add_stmt (build_case_label (low_value, high_value, label));
3028 /* Find the condition on which this switch statement depends. */
3029 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3030 if (cond && TREE_CODE (cond) == TREE_LIST)
3031 cond = TREE_VALUE (cond);
3033 if (!check_switch_goto (switch_stack->level))
3034 return error_mark_node;
3036 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3038 low_value = case_conversion (type, low_value);
3039 high_value = case_conversion (type, high_value);
3041 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3042 low_value, high_value);
3044 /* After labels, make any new cleanups in the function go into their
3045 own new (temporary) binding contour. */
3046 for (p = current_binding_level;
3047 p->kind != sk_function_parms;
3049 p->more_cleanups_ok = 0;
3054 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3057 typename_hash (const void* k)
3060 const_tree const t = (const_tree) k;
3062 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3063 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3068 typedef struct typename_info {
3076 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3077 really of type `typename_info*' */
3080 typename_compare (const void * k1, const void * k2)
3082 const_tree const t1 = (const_tree) k1;
3083 const typename_info *const t2 = (const typename_info *) k2;
3085 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3086 && TYPE_CONTEXT (t1) == t2->scope
3087 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3088 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3089 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3092 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3093 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3095 Returns the new TYPENAME_TYPE. */
3097 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3100 build_typename_type (tree context, tree name, tree fullname,
3101 enum tag_types tag_type)
3109 if (typename_htab == NULL)
3110 typename_htab = htab_create_ggc (61, &typename_hash,
3111 &typename_compare, NULL);
3113 ti.scope = FROB_CONTEXT (context);
3115 ti.template_id = fullname;
3116 ti.enum_p = tag_type == enum_type;
3117 ti.class_p = (tag_type == class_type
3118 || tag_type == record_type
3119 || tag_type == union_type);
3120 hash = (htab_hash_pointer (ti.scope)
3121 ^ htab_hash_pointer (ti.name));
3123 /* See if we already have this type. */
3124 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3129 /* Build the TYPENAME_TYPE. */
3130 t = cxx_make_type (TYPENAME_TYPE);
3131 TYPE_CONTEXT (t) = ti.scope;
3132 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3133 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3134 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3136 /* Build the corresponding TYPE_DECL. */
3137 d = build_decl (input_location, TYPE_DECL, name, t);
3138 TYPE_NAME (TREE_TYPE (d)) = d;
3139 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3140 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3141 DECL_ARTIFICIAL (d) = 1;
3143 /* Store it in the hash table. */
3146 /* TYPENAME_TYPEs must always be compared structurally, because
3147 they may or may not resolve down to another type depending on
3148 the currently open classes. */
3149 SET_TYPE_STRUCTURAL_EQUALITY (t);
3155 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3156 provided to name the type. Returns an appropriate type, unless an
3157 error occurs, in which case error_mark_node is returned. If we
3158 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3159 return that, rather than the _TYPE it corresponds to, in other
3160 cases we look through the type decl. If TF_ERROR is set, complain
3161 about errors, otherwise be quiet. */
3164 make_typename_type (tree context, tree name, enum tag_types tag_type,
3165 tsubst_flags_t complain)
3171 if (name == error_mark_node
3172 || context == NULL_TREE
3173 || context == error_mark_node)
3174 return error_mark_node;
3178 if (!(TYPE_LANG_SPECIFIC (name)
3179 && (CLASSTYPE_IS_TEMPLATE (name)
3180 || CLASSTYPE_USE_TEMPLATE (name))))
3181 name = TYPE_IDENTIFIER (name);
3183 /* Create a TEMPLATE_ID_EXPR for the type. */
3184 name = build_nt (TEMPLATE_ID_EXPR,
3185 CLASSTYPE_TI_TEMPLATE (name),
3186 CLASSTYPE_TI_ARGS (name));
3188 else if (TREE_CODE (name) == TYPE_DECL)
3189 name = DECL_NAME (name);
3193 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3195 name = TREE_OPERAND (name, 0);
3196 if (TREE_CODE (name) == TEMPLATE_DECL)
3197 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3198 else if (TREE_CODE (name) == OVERLOAD)
3200 error ("%qD is not a type", name);
3201 return error_mark_node;
3204 if (TREE_CODE (name) == TEMPLATE_DECL)
3206 error ("%qD used without template parameters", name);
3207 return error_mark_node;
3209 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3210 gcc_assert (TYPE_P (context));
3212 if (!MAYBE_CLASS_TYPE_P (context))
3214 if (complain & tf_error)
3215 error ("%q#T is not a class", context);
3216 return error_mark_node;
3219 /* When the CONTEXT is a dependent type, NAME could refer to a
3220 dependent base class of CONTEXT. But look inside it anyway
3221 if CONTEXT is a currently open scope, in case it refers to a
3222 member of the current instantiation or a non-dependent base;
3223 lookup will stop when we hit a dependent base. */
3224 if (!dependent_scope_p (context))
3225 /* We should only set WANT_TYPE when we're a nested typename type.
3226 Then we can give better diagnostics if we find a non-type. */
3227 t = lookup_field (context, name, 2, /*want_type=*/true);
3231 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3232 return build_typename_type (context, name, fullname, tag_type);
3234 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3238 if (complain & tf_error)
3239 error (want_template ? G_("no class template named %q#T in %q#T")
3240 : G_("no type named %q#T in %q#T"), name, context);
3241 return error_mark_node;
3244 /* Pull out the template from an injected-class-name (or multiple). */
3246 t = maybe_get_template_decl_from_type_decl (t);
3248 if (TREE_CODE (t) == TREE_LIST)
3250 if (complain & tf_error)
3252 error ("lookup of %qT in %qT is ambiguous", name, context);
3253 print_candidates (t);
3255 return error_mark_node;
3258 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3260 if (complain & tf_error)
3261 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3263 return error_mark_node;
3265 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3267 if (complain & tf_error)
3268 error ("%<typename %T::%D%> names %q#T, which is not a type",
3270 return error_mark_node;
3273 if (complain & tf_error)
3274 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3276 /* If we are currently parsing a template and if T is a typedef accessed
3277 through CONTEXT then we need to remember and check access of T at
3278 template instantiation time. */
3279 add_typedef_to_current_template_for_access_check (t, context, input_location);
3282 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3284 /*entering_scope=*/0,
3285 tf_warning_or_error | tf_user);
3287 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3293 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3294 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3295 in which case error_mark_node is returned.
3297 If PARM_LIST is non-NULL, also make sure that the template parameter
3298 list of TEMPLATE_DECL matches.
3300 If COMPLAIN zero, don't complain about any errors that occur. */
3303 make_unbound_class_template (tree context, tree name, tree parm_list,
3304 tsubst_flags_t complain)
3310 name = TYPE_IDENTIFIER (name);
3311 else if (DECL_P (name))
3312 name = DECL_NAME (name);
3313 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3315 if (!dependent_type_p (context)
3316 || currently_open_class (context))
3318 tree tmpl = NULL_TREE;
3320 if (MAYBE_CLASS_TYPE_P (context))
3321 tmpl = lookup_field (context, name, 0, false);
3323 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3324 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3326 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3328 if (complain & tf_error)
3329 error ("no class template named %q#T in %q#T", name, context);
3330 return error_mark_node;
3334 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3336 if (complain & tf_error)
3338 error ("template parameters do not match template");
3339 error ("%q+D declared here", tmpl);
3341 return error_mark_node;
3344 if (complain & tf_error)
3345 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3350 /* Build the UNBOUND_CLASS_TEMPLATE. */
3351 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3352 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3353 TREE_TYPE (t) = NULL_TREE;
3354 SET_TYPE_STRUCTURAL_EQUALITY (t);
3356 /* Build the corresponding TEMPLATE_DECL. */
3357 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3358 TYPE_NAME (TREE_TYPE (d)) = d;
3359 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3360 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3361 DECL_ARTIFICIAL (d) = 1;
3362 DECL_TEMPLATE_PARMS (d) = parm_list;
3369 /* Push the declarations of builtin types into the namespace.
3370 RID_INDEX is the index of the builtin type in the array
3371 RID_POINTERS. NAME is the name used when looking up the builtin
3372 type. TYPE is the _TYPE node for the builtin type. */
3375 record_builtin_type (enum rid rid_index,
3379 tree rname = NULL_TREE, tname = NULL_TREE;
3380 tree tdecl = NULL_TREE;
3382 if ((int) rid_index < (int) RID_MAX)
3383 rname = ridpointers[(int) rid_index];
3385 tname = get_identifier (name);
3387 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3388 eliminated. Built-in types should not be looked up name; their
3389 names are keywords that the parser can recognize. However, there
3390 is code in c-common.c that uses identifier_global_value to look
3391 up built-in types by name. */
3394 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3395 DECL_ARTIFICIAL (tdecl) = 1;
3396 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3402 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3403 DECL_ARTIFICIAL (tdecl) = 1;
3405 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3408 if (!TYPE_NAME (type))
3409 TYPE_NAME (type) = tdecl;
3412 debug_hooks->type_decl (tdecl, 0);
3415 /* Record one of the standard Java types.
3416 * Declare it as having the given NAME.
3417 * If SIZE > 0, it is the size of one of the integral types;
3418 * otherwise it is the negative of the size of one of the other types. */
3421 record_builtin_java_type (const char* name, int size)
3426 type = build_nonstandard_integer_type (size, 0);
3427 type = build_distinct_type_copy (type);
3429 else if (size > -32)
3432 /* "__java_char" or ""__java_boolean". */
3433 type = build_nonstandard_integer_type (-size, 1);
3434 type = build_distinct_type_copy (type);
3435 /* Get the signed type cached and attached to the unsigned type,
3436 so it doesn't get garbage-collected at "random" times,
3437 causing potential codegen differences out of different UIDs
3438 and different alias set numbers. */
3439 stype = build_nonstandard_integer_type (-size, 0);
3440 stype = build_distinct_type_copy (stype);
3441 TREE_CHAIN (type) = stype;
3442 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3445 { /* "__java_float" or ""__java_double". */
3446 type = make_node (REAL_TYPE);
3447 TYPE_PRECISION (type) = - size;
3450 record_builtin_type (RID_MAX, name, type);
3451 decl = TYPE_NAME (type);
3453 /* Suppress generate debug symbol entries for these types,
3454 since for normal C++ they are just clutter.
3455 However, push_lang_context undoes this if extern "Java" is seen. */
3456 DECL_IGNORED_P (decl) = 1;
3458 TYPE_FOR_JAVA (type) = 1;
3462 /* Push a type into the namespace so that the back ends ignore it. */
3465 record_unknown_type (tree type, const char* name)
3467 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3468 TYPE_DECL, get_identifier (name), type));
3469 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3470 DECL_IGNORED_P (decl) = 1;
3471 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3472 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3473 TYPE_ALIGN (type) = 1;
3474 TYPE_USER_ALIGN (type) = 0;
3475 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3478 /* A string for which we should create an IDENTIFIER_NODE at
3481 typedef struct predefined_identifier
3483 /* The name of the identifier. */
3484 const char *const name;
3485 /* The place where the IDENTIFIER_NODE should be stored. */
3487 /* Nonzero if this is the name of a constructor or destructor. */
3488 const int ctor_or_dtor_p;
3489 } predefined_identifier;
3491 /* Create all the predefined identifiers. */
3494 initialize_predefined_identifiers (void)
3496 const predefined_identifier *pid;
3498 /* A table of identifiers to create at startup. */
3499 static const predefined_identifier predefined_identifiers[] = {
3500 { "C++", &lang_name_cplusplus, 0 },
3501 { "C", &lang_name_c, 0 },
3502 { "Java", &lang_name_java, 0 },
3503 /* Some of these names have a trailing space so that it is
3504 impossible for them to conflict with names written by users. */
3505 { "__ct ", &ctor_identifier, 1 },
3506 { "__base_ctor ", &base_ctor_identifier, 1 },
3507 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3508 { "__dt ", &dtor_identifier, 1 },
3509 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3510 { "__base_dtor ", &base_dtor_identifier, 1 },
3511 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3512 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3513 { "nelts", &nelts_identifier, 0 },
3514 { THIS_NAME, &this_identifier, 0 },
3515 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3516 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3517 { "_vptr", &vptr_identifier, 0 },
3518 { "__vtt_parm", &vtt_parm_identifier, 0 },
3519 { "::", &global_scope_name, 0 },
3520 { "std", &std_identifier, 0 },
3524 for (pid = predefined_identifiers; pid->name; ++pid)
3526 *pid->node = get_identifier (pid->name);
3527 if (pid->ctor_or_dtor_p)
3528 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3532 /* Create the predefined scalar types of C,
3533 and some nodes representing standard constants (0, 1, (void *)0).
3534 Initialize the global binding level.
3535 Make definitions for built-in primitive functions. */
3538 cxx_init_decl_processing (void)
3541 tree void_ftype_ptr;
3543 /* Create all the identifiers we need. */
3544 initialize_predefined_identifiers ();
3546 /* Create the global variables. */
3547 push_to_top_level ();
3549 current_function_decl = NULL_TREE;
3550 current_binding_level = NULL;
3551 /* Enter the global namespace. */
3552 gcc_assert (global_namespace == NULL_TREE);
3553 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3555 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3556 TREE_PUBLIC (global_namespace) = 1;
3557 begin_scope (sk_namespace, global_namespace);
3559 if (flag_visibility_ms_compat)
3560 default_visibility = VISIBILITY_HIDDEN;
3563 current_lang_name = lang_name_c;
3565 /* Create the `std' namespace. */
3566 push_namespace (std_identifier);
3567 std_node = current_namespace;
3570 c_common_nodes_and_builtins ();
3572 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3573 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3574 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3575 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3576 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3577 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3578 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3579 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3581 integer_two_node = build_int_cst (NULL_TREE, 2);
3583 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3584 truthvalue_type_node = boolean_type_node;
3585 truthvalue_false_node = boolean_false_node;
3586 truthvalue_true_node = boolean_true_node;
3588 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3589 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3590 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3593 record_builtin_type (RID_MAX, NULL, string_type_node);
3596 delta_type_node = ptrdiff_type_node;
3597 vtable_index_type = ptrdiff_type_node;
3599 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3600 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3601 void_ftype_ptr = build_function_type_list (void_type_node,
3602 ptr_type_node, NULL_TREE);
3604 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3606 /* C++ extensions */
3608 unknown_type_node = make_node (LANG_TYPE);
3609 record_unknown_type (unknown_type_node, "unknown type");
3611 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3612 TREE_TYPE (unknown_type_node) = unknown_type_node;
3614 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3616 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3617 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3619 init_list_type_node = make_node (LANG_TYPE);
3620 record_unknown_type (init_list_type_node, "init list");
3622 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3623 record_unknown_type (dependent_lambda_return_type_node,
3624 "undeduced lambda return type");
3627 /* Make sure we get a unique function type, so we can give
3628 its pointer type a name. (This wins for gdb.) */
3629 tree vfunc_type = make_node (FUNCTION_TYPE);
3630 TREE_TYPE (vfunc_type) = integer_type_node;
3631 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3632 layout_type (vfunc_type);
3634 vtable_entry_type = build_pointer_type (vfunc_type);
3636 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3639 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3640 layout_type (vtbl_type_node);
3641 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3642 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3643 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3644 layout_type (vtbl_ptr_type_node);
3645 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3647 push_namespace (get_identifier ("__cxxabiv1"));
3648 abi_node = current_namespace;
3651 global_type_node = make_node (LANG_TYPE);
3652 record_unknown_type (global_type_node, "global type");
3655 current_lang_name = lang_name_cplusplus;
3658 tree newattrs, extvisattr;
3659 tree newtype, deltype;
3660 tree ptr_ftype_sizetype;
3664 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3665 if (cxx_dialect == cxx98)
3668 tree bad_alloc_type_node;
3669 tree bad_alloc_decl;
3671 push_namespace (std_identifier);
3672 bad_alloc_id = get_identifier ("bad_alloc");
3673 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3674 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3676 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3677 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3681 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3684 new_eh_spec = noexcept_false_spec;
3686 /* Ensure attribs.c is initialized. */
3688 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3690 newattrs = tree_cons (get_identifier ("alloc_size"),
3691 build_tree_list (NULL_TREE, integer_one_node),
3693 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3694 newtype = build_exception_variant (newtype, new_eh_spec);
3695 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3696 deltype = build_exception_variant (deltype, empty_except_spec);
3697 push_cp_library_fn (NEW_EXPR, newtype);
3698 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3699 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3700 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3702 nullptr_type_node = make_node (NULLPTR_TYPE);
3703 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3704 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3705 TYPE_UNSIGNED (nullptr_type_node) = 1;
3706 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3707 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3708 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3709 nullptr_node = build_int_cst (nullptr_type_node, 0);
3713 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3715 /* Perform other language dependent initializations. */
3716 init_class_processing ();
3717 init_rtti_processing ();
3718 init_template_processing ();
3720 if (flag_exceptions)
3721 init_exception_processing ();
3723 if (! supports_one_only ())
3726 make_fname_decl = cp_make_fname_decl;
3727 start_fname_decls ();
3729 /* Show we use EH for cleanups. */
3730 if (flag_exceptions)
3731 using_eh_for_cleanups ();
3734 /* Generate an initializer for a function naming variable from
3735 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3736 filled in with the type of the init. */
3739 cp_fname_init (const char* name, tree *type_p)
3741 tree domain = NULL_TREE;
3743 tree init = NULL_TREE;
3748 length = strlen (name);
3749 domain = build_index_type (size_int (length));
3750 init = build_string (length + 1, name);
3753 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3754 type = build_cplus_array_type (type, domain);
3759 TREE_TYPE (init) = type;
3761 init = error_mark_node;
3766 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3767 the decl, LOC is the location to give the decl, NAME is the
3768 initialization string and TYPE_DEP indicates whether NAME depended
3769 on the type of the function. We make use of that to detect
3770 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3771 at the point of first use, so we mustn't push the decl now. */
3774 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3776 const char *const name = (type_dep && processing_template_decl
3777 ? NULL : fname_as_string (type_dep));
3779 tree init = cp_fname_init (name, &type);
3780 tree decl = build_decl (loc, VAR_DECL, id, type);
3783 free (CONST_CAST (char *, name));
3785 /* As we're using pushdecl_with_scope, we must set the context. */
3786 DECL_CONTEXT (decl) = current_function_decl;
3787 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3789 TREE_STATIC (decl) = 1;
3790 TREE_READONLY (decl) = 1;
3791 DECL_ARTIFICIAL (decl) = 1;
3793 TREE_USED (decl) = 1;
3795 if (current_function_decl)
3797 cp_binding_level *b = current_binding_level;
3798 if (b->kind == sk_function_parms)
3799 return error_mark_node;
3800 while (b->level_chain->kind != sk_function_parms)
3802 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3803 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3804 LOOKUP_ONLYCONVERTING);
3808 DECL_THIS_STATIC (decl) = true;
3809 pushdecl_top_level_and_finish (decl, init);
3816 builtin_function_1 (tree decl, tree context, bool is_global)
3818 tree id = DECL_NAME (decl);
3819 const char *name = IDENTIFIER_POINTER (id);
3821 retrofit_lang_decl (decl);
3823 DECL_ARTIFICIAL (decl) = 1;
3824 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3825 SET_DECL_LANGUAGE (decl, lang_c);
3826 /* Runtime library routines are, by definition, available in an
3827 external shared object. */
3828 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3829 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3831 DECL_CONTEXT (decl) = context;
3834 pushdecl_top_level (decl);
3838 /* A function in the user's namespace should have an explicit
3839 declaration before it is used. Mark the built-in function as
3840 anticipated but not actually declared. */
3841 if (name[0] != '_' || name[1] != '_')
3842 DECL_ANTICIPATED (decl) = 1;
3843 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3845 size_t len = strlen (name);
3847 /* Treat __*_chk fortification functions as anticipated as well,
3848 unless they are __builtin_*. */
3849 if (len > strlen ("___chk")
3850 && memcmp (name + len - strlen ("_chk"),
3851 "_chk", strlen ("_chk") + 1) == 0)
3852 DECL_ANTICIPATED (decl) = 1;
3859 cxx_builtin_function (tree decl)
3861 tree id = DECL_NAME (decl);
3862 const char *name = IDENTIFIER_POINTER (id);
3863 /* All builtins that don't begin with an '_' should additionally
3864 go in the 'std' namespace. */
3867 tree decl2 = copy_node(decl);
3868 push_namespace (std_identifier);
3869 builtin_function_1 (decl2, std_node, false);
3873 return builtin_function_1 (decl, NULL_TREE, false);
3876 /* Like cxx_builtin_function, but guarantee the function is added to the global
3877 scope. This is to allow function specific options to add new machine
3878 dependent builtins when the target ISA changes via attribute((target(...)))
3879 which saves space on program startup if the program does not use non-generic
3883 cxx_builtin_function_ext_scope (tree decl)
3886 tree id = DECL_NAME (decl);
3887 const char *name = IDENTIFIER_POINTER (id);
3888 /* All builtins that don't begin with an '_' should additionally
3889 go in the 'std' namespace. */
3892 tree decl2 = copy_node(decl);
3893 push_namespace (std_identifier);
3894 builtin_function_1 (decl2, std_node, true);
3898 return builtin_function_1 (decl, NULL_TREE, true);
3901 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3902 function. Not called directly. */
3905 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3907 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3908 DECL_EXTERNAL (fn) = 1;
3909 TREE_PUBLIC (fn) = 1;
3910 DECL_ARTIFICIAL (fn) = 1;
3911 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3912 SET_DECL_LANGUAGE (fn, lang_c);
3913 /* Runtime library routines are, by definition, available in an
3914 external shared object. */
3915 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3916 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3920 /* Returns the _DECL for a library function with C linkage.
3921 We assume that such functions never throw; if this is incorrect,
3922 callers should unset TREE_NOTHROW. */
3925 build_library_fn (tree name, tree type)
3927 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3928 TREE_NOTHROW (fn) = 1;
3932 /* Returns the _DECL for a library function with C++ linkage. */
3935 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3937 tree fn = build_library_fn_1 (name, operator_code, type);
3938 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3939 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3940 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3944 /* Like build_library_fn, but takes a C string instead of an
3948 build_library_fn_ptr (const char* name, tree type)
3950 return build_library_fn (get_identifier (name), type);
3953 /* Like build_cp_library_fn, but takes a C string instead of an
3957 build_cp_library_fn_ptr (const char* name, tree type)
3959 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3962 /* Like build_library_fn, but also pushes the function so that we will
3963 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3964 may throw exceptions listed in RAISES. */
3967 push_library_fn (tree name, tree type, tree raises)
3972 type = build_exception_variant (type, raises);
3974 fn = build_library_fn (name, type);
3975 pushdecl_top_level (fn);
3979 /* Like build_cp_library_fn, but also pushes the function so that it
3980 will be found by normal lookup. */
3983 push_cp_library_fn (enum tree_code operator_code, tree type)
3985 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3992 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3996 push_void_library_fn (tree name, tree parmtypes)
3998 tree type = build_function_type (void_type_node, parmtypes);
3999 return push_library_fn (name, type, NULL_TREE);
4002 /* Like push_library_fn, but also note that this function throws
4003 and does not return. Used for __throw_foo and the like. */
4006 push_throw_library_fn (tree name, tree type)
4008 tree fn = push_library_fn (name, type, NULL_TREE);
4009 TREE_THIS_VOLATILE (fn) = 1;
4010 TREE_NOTHROW (fn) = 0;
4014 /* When we call finish_struct for an anonymous union, we create
4015 default copy constructors and such. But, an anonymous union
4016 shouldn't have such things; this function undoes the damage to the
4017 anonymous union type T.
4019 (The reason that we create the synthesized methods is that we don't
4020 distinguish `union { int i; }' from `typedef union { int i; } U'.
4021 The first is an anonymous union; the second is just an ordinary
4025 fixup_anonymous_aggr (tree t)
4029 /* Wipe out memory of synthesized methods. */
4030 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4031 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4032 TYPE_HAS_COPY_CTOR (t) = 0;
4033 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4034 TYPE_HAS_COPY_ASSIGN (t) = 0;
4035 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4037 /* Splice the implicitly generated functions out of the TYPE_METHODS
4039 q = &TYPE_METHODS (t);
4042 if (DECL_ARTIFICIAL (*q))
4043 *q = TREE_CHAIN (*q);
4045 q = &DECL_CHAIN (*q);
4048 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4049 if (TYPE_METHODS (t))
4051 tree decl = TYPE_MAIN_DECL (t);
4053 if (TREE_CODE (t) != UNION_TYPE)
4054 error_at (DECL_SOURCE_LOCATION (decl),
4055 "an anonymous struct cannot have function members");
4057 error_at (DECL_SOURCE_LOCATION (decl),
4058 "an anonymous union cannot have function members");
4061 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4062 assignment operators (because they cannot have these methods themselves).
4063 For anonymous unions this is already checked because they are not allowed
4064 in any union, otherwise we have to check it. */
4065 if (TREE_CODE (t) != UNION_TYPE)
4069 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4070 if (TREE_CODE (field) == FIELD_DECL)
4072 type = TREE_TYPE (field);
4073 if (CLASS_TYPE_P (type))
4075 if (TYPE_NEEDS_CONSTRUCTING (type))
4076 error ("member %q+#D with constructor not allowed "
4077 "in anonymous aggregate", field);
4078 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4079 error ("member %q+#D with destructor not allowed "
4080 "in anonymous aggregate", field);
4081 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4082 error ("member %q+#D with copy assignment operator "
4083 "not allowed in anonymous aggregate", field);
4089 /* Make sure that a declaration with no declarator is well-formed, i.e.
4090 just declares a tagged type or anonymous union.
4092 Returns the type declared; or NULL_TREE if none. */
4095 check_tag_decl (cp_decl_specifier_seq *declspecs)
4097 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4098 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4099 /* If a class, struct, or enum type is declared by the DECLSPECS
4100 (i.e, if a class-specifier, enum-specifier, or non-typename
4101 elaborated-type-specifier appears in the DECLSPECS),
4102 DECLARED_TYPE is set to the corresponding type. */
4103 tree declared_type = NULL_TREE;
4104 bool error_p = false;
4106 if (declspecs->multiple_types_p)
4107 error ("multiple types in one declaration");
4108 else if (declspecs->redefined_builtin_type)
4110 if (!in_system_header)
4111 permerror (input_location, "redeclaration of C++ built-in type %qT",
4112 declspecs->redefined_builtin_type);
4117 && TYPE_P (declspecs->type)
4118 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4119 && MAYBE_CLASS_TYPE_P (declspecs->type))
4120 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4121 declared_type = declspecs->type;
4122 else if (declspecs->type == error_mark_node)
4124 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4125 permerror (input_location, "declaration does not declare anything");
4126 /* Check for an anonymous union. */
4127 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4128 && TYPE_ANONYMOUS_P (declared_type))
4130 /* 7/3 In a simple-declaration, the optional init-declarator-list
4131 can be omitted only when declaring a class (clause 9) or
4132 enumeration (7.2), that is, when the decl-specifier-seq contains
4133 either a class-specifier, an elaborated-type-specifier with
4134 a class-key (9.1), or an enum-specifier. In these cases and
4135 whenever a class-specifier or enum-specifier is present in the
4136 decl-specifier-seq, the identifiers in these specifiers are among
4137 the names being declared by the declaration (as class-name,
4138 enum-names, or enumerators, depending on the syntax). In such
4139 cases, and except for the declaration of an unnamed bit-field (9.6),
4140 the decl-specifier-seq shall introduce one or more names into the
4141 program, or shall redeclare a name introduced by a previous
4142 declaration. [Example:
4143 enum { }; // ill-formed
4144 typedef class { }; // ill-formed
4148 error ("missing type-name in typedef-declaration");
4151 /* Anonymous unions are objects, so they can have specifiers. */;
4152 SET_ANON_AGGR_TYPE_P (declared_type);
4154 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4155 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4160 if (declspecs->specs[(int)ds_inline]
4161 || declspecs->specs[(int)ds_virtual])
4162 error ("%qs can only be specified for functions",
4163 declspecs->specs[(int)ds_inline]
4164 ? "inline" : "virtual");
4166 && (!current_class_type
4167 || current_scope () != current_class_type))
4168 error ("%<friend%> can only be specified inside a class");
4169 else if (declspecs->specs[(int)ds_explicit])
4170 error ("%<explicit%> can only be specified for constructors");
4171 else if (declspecs->storage_class)
4172 error ("a storage class can only be specified for objects "
4174 else if (declspecs->specs[(int)ds_const]
4175 || declspecs->specs[(int)ds_volatile]
4176 || declspecs->specs[(int)ds_restrict]
4177 || declspecs->specs[(int)ds_thread])
4178 error ("qualifiers can only be specified for objects "
4180 else if (saw_typedef)
4181 warning (0, "%<typedef%> was ignored in this declaration");
4182 else if (declspecs->specs[(int) ds_constexpr])
4183 error ("%<constexpr%> cannot be used for type declarations");
4186 return declared_type;
4189 /* Called when a declaration is seen that contains no names to declare.
4190 If its type is a reference to a structure, union or enum inherited
4191 from a containing scope, shadow that tag name for the current scope
4192 with a forward reference.
4193 If its type defines a new named structure or union
4194 or defines an enum, it is valid but we need not do anything here.
4195 Otherwise, it is an error.
4197 C++: may have to grok the declspecs to learn about static,
4198 complain for anonymous unions.
4200 Returns the TYPE declared -- or NULL_TREE if none. */
4203 shadow_tag (cp_decl_specifier_seq *declspecs)
4205 tree t = check_tag_decl (declspecs);
4210 if (declspecs->attributes)
4212 warning (0, "attribute ignored in declaration of %q+#T", t);
4213 warning (0, "attribute for %q+#T must follow the %qs keyword",
4214 t, class_key_or_enum_as_string (t));
4218 if (maybe_process_partial_specialization (t) == error_mark_node)
4221 /* This is where the variables in an anonymous union are
4222 declared. An anonymous union declaration looks like:
4224 because there is no declarator after the union, the parser
4225 sends that declaration here. */
4226 if (ANON_AGGR_TYPE_P (t))
4228 fixup_anonymous_aggr (t);
4230 if (TYPE_FIELDS (t))
4232 tree decl = grokdeclarator (/*declarator=*/NULL,
4233 declspecs, NORMAL, 0, NULL);
4234 finish_anon_union (decl);
4241 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4244 groktypename (cp_decl_specifier_seq *type_specifiers,
4245 const cp_declarator *declarator,
4246 bool is_template_arg)
4250 enum decl_context context
4251 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4252 attrs = type_specifiers->attributes;
4253 type_specifiers->attributes = NULL_TREE;
4254 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4255 if (attrs && type != error_mark_node)
4257 if (CLASS_TYPE_P (type))
4258 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4259 "outside of definition", type);
4260 else if (MAYBE_CLASS_TYPE_P (type))
4261 /* A template type parameter or other dependent type. */
4262 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4263 "type %qT without an associated declaration", type);
4265 cplus_decl_attributes (&type, attrs, 0);
4270 /* Process a DECLARATOR for a function-scope variable declaration,
4271 namespace-scope variable declaration, or function declaration.
4272 (Function definitions go through start_function; class member
4273 declarations appearing in the body of the class go through
4274 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4275 If an error occurs, the error_mark_node is returned instead.
4277 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4278 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4279 for an explicitly defaulted function, or SD_DELETED for an explicitly
4280 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4281 implicitly initialized via a default constructor. ATTRIBUTES and
4282 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4283 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4284 set, the caller is responsible for calling pop_scope. */
4287 start_decl (const cp_declarator *declarator,
4288 cp_decl_specifier_seq *declspecs,
4291 tree prefix_attributes,
4292 tree *pushed_scope_p)
4300 *pushed_scope_p = NULL_TREE;
4302 /* An object declared as __attribute__((deprecated)) suppresses
4303 warnings of uses of other deprecated items. */
4304 if (lookup_attribute ("deprecated", attributes))
4305 deprecated_state = DEPRECATED_SUPPRESS;
4307 attributes = chainon (attributes, prefix_attributes);
4309 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4312 deprecated_state = DEPRECATED_NORMAL;
4314 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4315 || decl == error_mark_node)
4316 return error_mark_node;
4318 context = CP_DECL_CONTEXT (decl);
4319 if (context != global_namespace)
4320 *pushed_scope_p = push_scope (context);
4323 /* Is it valid for this decl to have an initializer at all?
4324 If not, set INITIALIZED to zero, which will indirectly
4325 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4326 switch (TREE_CODE (decl))
4329 error ("typedef %qD is initialized (use decltype instead)", decl);
4330 return error_mark_node;
4333 if (initialized == SD_DELETED)
4334 /* We'll handle the rest of the semantics later, but we need to
4335 set this now so it's visible to duplicate_decls. */
4336 DECL_DELETED_FN (decl) = 1;
4345 if (! toplevel_bindings_p ()
4346 && DECL_EXTERNAL (decl))
4347 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4349 DECL_EXTERNAL (decl) = 0;
4350 if (toplevel_bindings_p ())
4351 TREE_STATIC (decl) = 1;
4353 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4355 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4356 record_key_method_defined (decl);
4358 /* If this is a typedef that names the class for linkage purposes
4359 (7.1.3p8), apply any attributes directly to the type. */
4360 if (TREE_CODE (decl) == TYPE_DECL
4361 && TAGGED_TYPE_P (TREE_TYPE (decl))
4362 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4363 flags = ATTR_FLAG_TYPE_IN_PLACE;
4367 /* Set attributes here so if duplicate decl, will have proper attributes. */
4368 cplus_decl_attributes (&decl, attributes, flags);
4370 /* Dllimported symbols cannot be defined. Static data members (which
4371 can be initialized in-class and dllimported) go through grokfield,
4372 not here, so we don't need to exclude those decls when checking for
4374 if (initialized && DECL_DLLIMPORT_P (decl))
4376 error ("definition of %q#D is marked %<dllimport%>", decl);
4377 DECL_DLLIMPORT_P (decl) = 0;
4380 /* If #pragma weak was used, mark the decl weak now. */
4381 maybe_apply_pragma_weak (decl);
4383 if (TREE_CODE (decl) == FUNCTION_DECL
4384 && DECL_DECLARED_INLINE_P (decl)
4385 && DECL_UNINLINABLE (decl)
4386 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4387 warning (0, "inline function %q+D given attribute noinline", decl);
4389 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4391 if (TREE_CODE (decl) == VAR_DECL)
4393 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4394 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4395 error ("%q#D is not a static member of %q#T", decl, context);
4398 if (DECL_CONTEXT (field) != context)
4400 if (!same_type_p (DECL_CONTEXT (field), context))
4401 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4402 "to be defined as %<%T::%D%>",
4403 DECL_CONTEXT (field), DECL_NAME (decl),
4404 context, DECL_NAME (decl));
4405 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4407 if (processing_specialization
4408 && template_class_depth (context) == 0
4409 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4410 error ("template header not allowed in member definition "
4411 "of explicitly specialized class");
4412 /* Static data member are tricky; an in-class initialization
4413 still doesn't provide a definition, so the in-class
4414 declaration will have DECL_EXTERNAL set, but will have an
4415 initialization. Thus, duplicate_decls won't warn
4416 about this situation, and so we check here. */
4417 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4418 error ("duplicate initialization of %qD", decl);
4419 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4421 if (declspecs->specs[(int) ds_constexpr]
4422 && !DECL_DECLARED_CONSTEXPR_P (field))
4423 error ("%qD declared %<constexpr%> outside its class", field);
4428 tree field = check_classfn (context, decl,
4429 (processing_template_decl
4430 > template_class_depth (context))
4431 ? current_template_parms
4433 if (field && field != error_mark_node
4434 && duplicate_decls (decl, field,
4435 /*newdecl_is_friend=*/false))
4439 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4440 DECL_IN_AGGR_P (decl) = 0;
4441 /* Do not mark DECL as an explicit specialization if it was not
4442 already marked as an instantiation; a declaration should
4443 never be marked as a specialization unless we know what
4444 template is being specialized. */
4445 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4447 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4449 /* [temp.expl.spec] An explicit specialization of a static data
4450 member of a template is a definition if the declaration
4451 includes an initializer; otherwise, it is a declaration.
4453 We check for processing_specialization so this only applies
4454 to the new specialization syntax. */
4455 if (!initialized && processing_specialization)
4456 DECL_EXTERNAL (decl) = 1;
4459 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4460 /* Aliases are definitions. */
4462 permerror (input_location, "declaration of %q#D outside of class is not definition",
4466 was_public = TREE_PUBLIC (decl);
4468 /* Enter this declaration into the symbol table. */
4469 decl = maybe_push_decl (decl);
4471 if (processing_template_decl)
4472 decl = push_template_decl (decl);
4473 if (decl == error_mark_node)
4474 return error_mark_node;
4476 /* Tell the back end to use or not use .common as appropriate. If we say
4477 -fconserve-space, we want this to save .data space, at the expense of
4478 wrong semantics. If we say -fno-conserve-space, we want this to
4479 produce errors about redefs; to do this we force variables into the
4481 if (flag_conserve_space
4482 && TREE_CODE (decl) == VAR_DECL
4483 && TREE_PUBLIC (decl)
4484 && !DECL_THREAD_LOCAL_P (decl)
4485 && !have_global_bss_p ())
4486 DECL_COMMON (decl) = 1;
4488 if (TREE_CODE (decl) == VAR_DECL
4489 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4490 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4492 /* This is a const variable with implicit 'static'. Set
4493 DECL_THIS_STATIC so we can tell it from variables that are
4494 !TREE_PUBLIC because of the anonymous namespace. */
4495 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4496 DECL_THIS_STATIC (decl) = 1;
4499 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4500 start_decl_1 (decl, initialized);
4505 /* Process the declaration of a variable DECL. INITIALIZED is true
4506 iff DECL is explicitly initialized. (INITIALIZED is false if the
4507 variable is initialized via an implicitly-called constructor.)
4508 This function must be called for ordinary variables (including, for
4509 example, implicit instantiations of templates), but must not be
4510 called for template declarations. */
4513 start_decl_1 (tree decl, bool initialized)
4517 bool aggregate_definition_p;
4519 gcc_assert (!processing_template_decl);
4521 if (error_operand_p (decl))
4524 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4526 type = TREE_TYPE (decl);
4527 complete_p = COMPLETE_TYPE_P (type);
4528 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4530 /* If an explicit initializer is present, or if this is a definition
4531 of an aggregate, then we need a complete type at this point.
4532 (Scalars are always complete types, so there is nothing to
4533 check.) This code just sets COMPLETE_P; errors (if necessary)
4534 are issued below. */
4535 if ((initialized || aggregate_definition_p)
4537 && COMPLETE_TYPE_P (complete_type (type)))
4540 /* We will not yet have set TREE_READONLY on DECL if the type
4541 was "const", but incomplete, before this point. But, now, we
4542 have a complete type, so we can try again. */
4543 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4547 /* Is it valid for this decl to have an initializer at all? */
4549 /* Don't allow initializations for incomplete types except for
4550 arrays which might be completed by the initialization. */
4552 ; /* A complete type is ok. */
4553 else if (type_uses_auto (type))
4554 ; /* An auto type is ok. */
4555 else if (TREE_CODE (type) != ARRAY_TYPE)
4557 error ("variable %q#D has initializer but incomplete type", decl);
4558 type = TREE_TYPE (decl) = error_mark_node;
4560 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4562 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4563 error ("elements of array %q#D have incomplete type", decl);
4564 /* else we already gave an error in start_decl. */
4567 else if (aggregate_definition_p && !complete_p)
4569 if (type_uses_auto (type))
4570 error ("declaration of %q#D has no initializer", decl);
4572 error ("aggregate %q#D has incomplete type and cannot be defined",
4574 /* Change the type so that assemble_variable will give
4575 DECL an rtl we can live with: (mem (const_int 0)). */
4576 type = TREE_TYPE (decl) = error_mark_node;
4579 /* Create a new scope to hold this declaration if necessary.
4580 Whether or not a new scope is necessary cannot be determined
4581 until after the type has been completed; if the type is a
4582 specialization of a class template it is not until after
4583 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4584 will be set correctly. */
4585 maybe_push_cleanup_level (type);
4588 /* Handle initialization of references. DECL, TYPE, and INIT have the
4589 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4590 but will be set to a new CLEANUP_STMT if a temporary is created
4591 that must be destroyed subsequently.
4593 Returns an initializer expression to use to initialize DECL, or
4594 NULL if the initialization can be performed statically.
4596 Quotes on semantics can be found in ARM 8.4.3. */
4599 grok_reference_init (tree decl, tree type, tree init, tree *cleanup,
4604 if (init == NULL_TREE)
4606 if ((DECL_LANG_SPECIFIC (decl) == 0
4607 || DECL_IN_AGGR_P (decl) == 0)
4608 && ! DECL_THIS_EXTERN (decl))
4609 error ("%qD declared as reference but not initialized", decl);
4613 if (TREE_CODE (init) == TREE_LIST)
4614 init = build_x_compound_expr_from_list (init, ELK_INIT,
4615 tf_warning_or_error);
4617 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4618 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4619 /* Note: default conversion is only called in very special cases. */
4620 init = decay_conversion (init);
4622 /* Convert INIT to the reference type TYPE. This may involve the
4623 creation of a temporary, whose lifetime must be the same as that
4624 of the reference. If so, a DECL_EXPR for the temporary will be
4625 added just after the DECL_EXPR for DECL. That's why we don't set
4626 DECL_INITIAL for local references (instead assigning to them
4627 explicitly); we need to allow the temporary to be initialized
4629 tmp = initialize_reference (type, init, decl, cleanup, flags,
4630 tf_warning_or_error);
4631 if (DECL_DECLARED_CONSTEXPR_P (decl))
4633 tmp = cxx_constant_value (tmp);
4634 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4635 = reduced_constant_expression_p (tmp);
4638 if (tmp == error_mark_node)
4640 else if (tmp == NULL_TREE)
4642 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4646 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4649 DECL_INITIAL (decl) = tmp;
4654 /* Subroutine of check_initializer. We're initializing a DECL of
4655 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4656 extend the lifetime of the underlying array to match that of the decl,
4657 just like for reference initialization. CLEANUP is as for
4658 grok_reference_init. */
4661 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4664 tree aggr_init, array, arrtype;
4665 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4666 if (error_operand_p (init))
4667 return error_mark_node;
4669 aggr_init = TARGET_EXPR_INITIAL (init);
4670 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4671 arrtype = TREE_TYPE (array);
4673 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4674 array = TREE_OPERAND (array, 0);
4675 /* If the array is constant, finish_compound_literal already made it a
4676 static variable and we don't need to do anything here. */
4677 if (decl && TREE_CODE (array) == TARGET_EXPR)
4679 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4680 var = build_address (var);
4681 var = convert (arrtype, var);
4682 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4687 /* Designated initializers in arrays are not supported in GNU C++.
4688 The parser cannot detect this error since it does not know whether
4689 a given brace-enclosed initializer is for a class type or for an
4690 array. This function checks that CE does not use a designated
4691 initializer. If it does, an error is issued. Returns true if CE
4692 is valid, i.e., does not have a designated initializer. */
4695 check_array_designated_initializer (const constructor_elt *ce,
4696 unsigned HOST_WIDE_INT index)
4698 /* Designated initializers for array elements are not supported. */
4701 /* The parser only allows identifiers as designated
4703 if (ce->index == error_mark_node)
4704 error ("name used in a GNU-style designated "
4705 "initializer for an array");
4706 else if (TREE_CODE (ce->index) == INTEGER_CST)
4708 /* A C99 designator is OK if it matches the current index. */
4709 if (TREE_INT_CST_LOW (ce->index) == index)
4712 sorry ("non-trivial designated initializers not supported");
4716 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4717 error ("name %qD used in a GNU-style designated "
4718 "initializer for an array", ce->index);
4726 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4727 array until we finish parsing the initializer. If that's the
4728 situation we're in, update DECL accordingly. */
4731 maybe_deduce_size_from_array_init (tree decl, tree init)
4733 tree type = TREE_TYPE (decl);
4735 if (TREE_CODE (type) == ARRAY_TYPE
4736 && TYPE_DOMAIN (type) == NULL_TREE
4737 && TREE_CODE (decl) != TYPE_DECL)
4739 /* do_default is really a C-ism to deal with tentative definitions.
4740 But let's leave it here to ease the eventual merge. */
4741 int do_default = !DECL_EXTERNAL (decl);
4742 tree initializer = init ? init : DECL_INITIAL (decl);
4745 /* Check that there are no designated initializers in INIT, as
4746 those are not supported in GNU C++, and as the middle-end
4747 will crash if presented with a non-numeric designated
4749 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4751 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4752 constructor_elt *ce;
4754 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4755 if (!check_array_designated_initializer (ce, i))
4761 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4765 error ("initializer fails to determine size of %qD", decl);
4766 TREE_TYPE (decl) = error_mark_node;
4768 else if (failure == 2)
4772 error ("array size missing in %qD", decl);
4773 TREE_TYPE (decl) = error_mark_node;
4775 /* If a `static' var's size isn't known, make it extern as
4776 well as static, so it does not get allocated. If it's not
4777 `static', then don't mark it extern; finish_incomplete_decl
4778 will give it a default size and it will get allocated. */
4779 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4780 DECL_EXTERNAL (decl) = 1;
4782 else if (failure == 3)
4784 error ("zero-size array %qD", decl);
4785 TREE_TYPE (decl) = error_mark_node;
4789 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4791 relayout_decl (decl);
4795 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4796 any appropriate error messages regarding the layout. */
4799 layout_var_decl (tree decl)
4803 type = TREE_TYPE (decl);
4804 if (type == error_mark_node)
4807 /* If we haven't already layed out this declaration, do so now.
4808 Note that we must not call complete type for an external object
4809 because it's type might involve templates that we are not
4810 supposed to instantiate yet. (And it's perfectly valid to say
4811 `extern X x' for some incomplete type `X'.) */
4812 if (!DECL_EXTERNAL (decl))
4813 complete_type (type);
4814 if (!DECL_SIZE (decl)
4815 && TREE_TYPE (decl) != error_mark_node
4816 && (COMPLETE_TYPE_P (type)
4817 || (TREE_CODE (type) == ARRAY_TYPE
4818 && !TYPE_DOMAIN (type)
4819 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4820 layout_decl (decl, 0);
4822 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4824 /* An automatic variable with an incomplete type: that is an error.
4825 Don't talk about array types here, since we took care of that
4826 message in grokdeclarator. */
4827 error ("storage size of %qD isn%'t known", decl);
4828 TREE_TYPE (decl) = error_mark_node;
4831 /* Keep this code around in case we later want to control debug info
4832 based on whether a type is "used". (jason 1999-11-11) */
4834 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4835 /* Let debugger know it should output info for this type. */
4836 note_debug_info_needed (ttype);
4838 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4839 note_debug_info_needed (DECL_CONTEXT (decl));
4842 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4843 && DECL_SIZE (decl) != NULL_TREE
4844 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4846 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4847 constant_expression_warning (DECL_SIZE (decl));
4850 error ("storage size of %qD isn%'t constant", decl);
4851 TREE_TYPE (decl) = error_mark_node;
4856 /* If a local static variable is declared in an inline function, or if
4857 we have a weak definition, we must endeavor to create only one
4858 instance of the variable at link-time. */
4861 maybe_commonize_var (tree decl)
4863 /* Static data in a function with comdat linkage also has comdat
4865 if (TREE_STATIC (decl)
4866 /* Don't mess with __FUNCTION__. */
4867 && ! DECL_ARTIFICIAL (decl)
4868 && DECL_FUNCTION_SCOPE_P (decl)
4869 && vague_linkage_p (DECL_CONTEXT (decl)))
4873 /* With weak symbols, we simply make the variable COMDAT;
4874 that will cause copies in multiple translations units to
4876 comdat_linkage (decl);
4880 if (DECL_INITIAL (decl) == NULL_TREE
4881 || DECL_INITIAL (decl) == error_mark_node)
4883 /* Without weak symbols, we can use COMMON to merge
4884 uninitialized variables. */
4885 TREE_PUBLIC (decl) = 1;
4886 DECL_COMMON (decl) = 1;
4890 /* While for initialized variables, we must use internal
4891 linkage -- which means that multiple copies will not
4893 TREE_PUBLIC (decl) = 0;
4894 DECL_COMMON (decl) = 0;
4895 warning_at (input_location, 0,
4896 "sorry: semantics of inline function static "
4897 "data %q+#D are wrong (you%'ll wind up "
4898 "with multiple copies)", decl);
4899 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4900 " you can work around this by removing "
4905 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4906 /* Set it up again; we might have set DECL_INITIAL since the last
4908 comdat_linkage (decl);
4911 /* Issue an error message if DECL is an uninitialized const variable. */
4914 check_for_uninitialized_const_var (tree decl)
4916 tree type = strip_array_types (TREE_TYPE (decl));
4918 /* ``Unless explicitly declared extern, a const object does not have
4919 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4921 if (TREE_CODE (decl) == VAR_DECL
4922 && TREE_CODE (type) != REFERENCE_TYPE
4923 && CP_TYPE_CONST_P (type)
4924 && !DECL_INITIAL (decl))
4926 tree field = default_init_uninitialized_part (type);
4930 permerror (DECL_SOURCE_LOCATION (decl),
4931 "uninitialized const %qD", decl);
4933 if (CLASS_TYPE_P (type))
4935 tree defaulted_ctor;
4937 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4938 "%q#T has no user-provided default constructor", type);
4939 defaulted_ctor = in_class_defaulted_default_constructor (type);
4941 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4942 "constructor is not user-provided because it is "
4943 "explicitly defaulted in the class body");
4944 inform (0, "and the implicitly-defined constructor does not "
4945 "initialize %q+#D", field);
4950 /* Structure holding the current initializer being processed by reshape_init.
4951 CUR is a pointer to the current element being processed, END is a pointer
4952 after the last element present in the initializer. */
4953 typedef struct reshape_iterator_t
4955 constructor_elt *cur;
4956 constructor_elt *end;
4959 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4961 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4962 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4963 initialized. If there are no more such fields, the return value
4967 next_initializable_field (tree field)
4970 && (TREE_CODE (field) != FIELD_DECL
4971 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4972 || DECL_ARTIFICIAL (field)))
4973 field = DECL_CHAIN (field);
4978 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4979 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4980 INTEGER_CST representing the size of the array minus one (the maximum index),
4981 or NULL_TREE if the array was declared without specifying the size. D is
4982 the iterator within the constructor. */
4985 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4986 tsubst_flags_t complain)
4989 bool sized_array_p = (max_index != NULL_TREE);
4990 unsigned HOST_WIDE_INT max_index_cst = 0;
4991 unsigned HOST_WIDE_INT index;
4993 /* The initializer for an array is always a CONSTRUCTOR. */
4994 new_init = build_constructor (init_list_type_node, NULL);
4998 /* Minus 1 is used for zero sized arrays. */
4999 if (integer_all_onesp (max_index))
5002 if (host_integerp (max_index, 1))
5003 max_index_cst = tree_low_cst (max_index, 1);
5004 /* sizetype is sign extended, not zero extended. */
5006 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
5010 /* Loop until there are no more initializers. */
5012 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5017 check_array_designated_initializer (d->cur, index);
5018 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5020 if (elt_init == error_mark_node)
5021 return error_mark_node;
5022 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5023 size_int (index), elt_init);
5024 if (!TREE_CONSTANT (elt_init))
5025 TREE_CONSTANT (new_init) = false;
5031 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5032 Parameters are the same of reshape_init_r. */
5035 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5037 tree max_index = NULL_TREE;
5039 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5041 if (TYPE_DOMAIN (type))
5042 max_index = array_type_nelts (type);
5044 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5047 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5048 Parameters are the same of reshape_init_r. */
5051 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5053 tree max_index = NULL_TREE;
5055 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5057 if (COMPOUND_LITERAL_P (d->cur->value))
5059 tree value = d->cur->value;
5060 if (!same_type_p (TREE_TYPE (value), type))
5062 if (complain & tf_error)
5063 error ("invalid type %qT as initializer for a vector of type %qT",
5064 TREE_TYPE (d->cur->value), type);
5065 value = error_mark_node;
5071 /* For a vector, we initialize it as an array of the appropriate size. */
5072 if (TREE_CODE (type) == VECTOR_TYPE)
5073 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5075 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5078 /* Subroutine of reshape_init_r, processes the initializers for classes
5079 or union. Parameters are the same of reshape_init_r. */
5082 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5083 tsubst_flags_t complain)
5088 gcc_assert (CLASS_TYPE_P (type));
5090 /* The initializer for a class is always a CONSTRUCTOR. */
5091 new_init = build_constructor (init_list_type_node, NULL);
5092 field = next_initializable_field (TYPE_FIELDS (type));
5098 An initializer for an aggregate member that is an
5099 empty class shall have the form of an empty
5100 initializer-list {}. */
5101 if (!first_initializer_p)
5103 if (complain & tf_error)
5104 error ("initializer for %qT must be brace-enclosed", type);
5105 return error_mark_node;
5110 /* Loop through the initializable fields, gathering initializers. */
5111 while (d->cur != d->end)
5115 /* Handle designated initializers, as an extension. */
5118 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5120 if (!field || TREE_CODE (field) != FIELD_DECL)
5122 if (complain & tf_error)
5123 error ("%qT has no non-static data member named %qD", type,
5125 return error_mark_node;
5129 /* If we processed all the member of the class, we are done. */
5133 field_init = reshape_init_r (TREE_TYPE (field), d,
5134 /*first_initializer_p=*/false, complain);
5135 if (field_init == error_mark_node)
5136 return error_mark_node;
5138 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5142 When a union is initialized with a brace-enclosed
5143 initializer, the braces shall only contain an
5144 initializer for the first member of the union. */
5145 if (TREE_CODE (type) == UNION_TYPE)
5148 field = next_initializable_field (DECL_CHAIN (field));
5154 /* Subroutine of reshape_init, which processes a single initializer (part of
5155 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5156 iterator within the CONSTRUCTOR which points to the initializer to process.
5157 FIRST_INITIALIZER_P is true if this is the first initializer of the
5158 outermost CONSTRUCTOR node. */
5161 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5162 tsubst_flags_t complain)
5164 tree init = d->cur->value;
5166 if (error_operand_p (init))
5167 return error_mark_node;
5169 if (TREE_CODE (type) == COMPLEX_TYPE)
5171 /* A complex type can be initialized from one or two initializers,
5172 but braces are not elided. */
5174 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5176 if (CONSTRUCTOR_NELTS (init) > 2)
5178 if (complain & tf_error)
5179 error ("too many initializers for %qT", type);
5181 return error_mark_node;
5184 else if (first_initializer_p && d->cur != d->end)
5186 VEC(constructor_elt, gc) *v = 0;
5187 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5188 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5190 init = build_constructor (init_list_type_node, v);
5195 /* A non-aggregate type is always initialized with a single
5197 if (!CP_AGGREGATE_TYPE_P (type))
5199 /* It is invalid to initialize a non-aggregate type with a
5200 brace-enclosed initializer before C++0x.
5201 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5202 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5203 a CONSTRUCTOR (with a record type). */
5204 if (TREE_CODE (init) == CONSTRUCTOR
5205 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5207 if (SCALAR_TYPE_P (type))
5209 if (complain & tf_error)
5210 error ("braces around scalar initializer for type %qT", type);
5211 init = error_mark_node;
5214 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5223 All implicit type conversions (clause _conv_) are considered when
5224 initializing the aggregate member with an initializer from an
5225 initializer-list. If the initializer can initialize a member,
5226 the member is initialized. Otherwise, if the member is itself a
5227 non-empty subaggregate, brace elision is assumed and the
5228 initializer is considered for the initialization of the first
5229 member of the subaggregate. */
5230 if (TREE_CODE (init) != CONSTRUCTOR
5231 /* But don't try this for the first initializer, since that would be
5232 looking through the outermost braces; A a2 = { a1 }; is not a
5233 valid aggregate initialization. */
5234 && !first_initializer_p
5235 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5236 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5242 /* [dcl.init.string]
5244 A char array (whether plain char, signed char, or unsigned char)
5245 can be initialized by a string-literal (optionally enclosed in
5246 braces); a wchar_t array can be initialized by a wide
5247 string-literal (optionally enclosed in braces). */
5248 if (TREE_CODE (type) == ARRAY_TYPE
5249 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5251 tree str_init = init;
5253 /* Strip one level of braces if and only if they enclose a single
5254 element (as allowed by [dcl.init.string]). */
5255 if (!first_initializer_p
5256 && TREE_CODE (str_init) == CONSTRUCTOR
5257 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5259 str_init = VEC_index (constructor_elt,
5260 CONSTRUCTOR_ELTS (str_init), 0)->value;
5263 /* If it's a string literal, then it's the initializer for the array
5264 as a whole. Otherwise, continue with normal initialization for
5265 array types (one value per array element). */
5266 if (TREE_CODE (str_init) == STRING_CST)
5273 /* The following cases are about aggregates. If we are not within a full
5274 initializer already, and there is not a CONSTRUCTOR, it means that there
5275 is a missing set of braces (that is, we are processing the case for
5276 which reshape_init exists). */
5277 if (!first_initializer_p)
5279 if (TREE_CODE (init) == CONSTRUCTOR)
5281 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5282 /* There is no need to reshape pointer-to-member function
5283 initializers, as they are always constructed correctly
5284 by the front end. */
5286 else if (COMPOUND_LITERAL_P (init))
5287 /* For a nested compound literal, there is no need to reshape since
5288 brace elision is not allowed. Even if we decided to allow it,
5289 we should add a call to reshape_init in finish_compound_literal,
5290 before calling digest_init, so changing this code would still
5291 not be necessary. */
5292 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5296 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5297 return reshape_init (type, init, complain);
5301 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5305 /* Dispatch to specialized routines. */
5306 if (CLASS_TYPE_P (type))
5307 return reshape_init_class (type, d, first_initializer_p, complain);
5308 else if (TREE_CODE (type) == ARRAY_TYPE)
5309 return reshape_init_array (type, d, complain);
5310 else if (TREE_CODE (type) == VECTOR_TYPE)
5311 return reshape_init_vector (type, d, complain);
5316 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5317 brace-enclosed aggregate initializer.
5319 INIT is the CONSTRUCTOR containing the list of initializers describing
5320 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5321 It may not presently match the shape of the TYPE; for example:
5323 struct S { int a; int b; };
5324 struct S a[] = { 1, 2, 3, 4 };
5326 Here INIT will hold a VEC of four elements, rather than a
5327 VEC of two elements, each itself a VEC of two elements. This
5328 routine transforms INIT from the former form into the latter. The
5329 revised CONSTRUCTOR node is returned. */
5332 reshape_init (tree type, tree init, tsubst_flags_t complain)
5334 VEC(constructor_elt, gc) *v;
5338 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5340 v = CONSTRUCTOR_ELTS (init);
5342 /* An empty constructor does not need reshaping, and it is always a valid
5344 if (VEC_empty (constructor_elt, v))
5347 /* Recurse on this CONSTRUCTOR. */
5348 d.cur = VEC_index (constructor_elt, v, 0);
5349 d.end = d.cur + VEC_length (constructor_elt, v);
5351 new_init = reshape_init_r (type, &d, true, complain);
5352 if (new_init == error_mark_node)
5353 return error_mark_node;
5355 /* Make sure all the element of the constructor were used. Otherwise,
5356 issue an error about exceeding initializers. */
5359 if (complain & tf_error)
5360 error ("too many initializers for %qT", type);
5362 return error_mark_node;
5368 /* Verify array initializer. Returns true if errors have been reported. */
5371 check_array_initializer (tree decl, tree type, tree init)
5373 tree element_type = TREE_TYPE (type);
5375 /* The array type itself need not be complete, because the
5376 initializer may tell us how many elements are in the array.
5377 But, the elements of the array must be complete. */
5378 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5381 error ("elements of array %q#D have incomplete type", decl);
5383 error ("elements of array %q#T have incomplete type", type);
5386 /* It is not valid to initialize a VLA. */
5388 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5389 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5392 error ("variable-sized object %qD may not be initialized", decl);
5394 error ("variable-sized compound literal");
5400 /* Subroutine of check_initializer; args are passed down from that function.
5401 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5404 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5407 int saved_stmts_are_full_exprs_p = 0;
5408 if (building_stmt_list_p ())
5410 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5411 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5413 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5414 if (building_stmt_list_p ())
5415 current_stmt_tree ()->stmts_are_full_exprs_p =
5416 saved_stmts_are_full_exprs_p;
5420 /* Verify INIT (the initializer for DECL), and record the
5421 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5422 grok_reference_init.
5424 If the return value is non-NULL, it is an expression that must be
5425 evaluated dynamically to initialize DECL. */
5428 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5430 tree type = TREE_TYPE (decl);
5431 tree init_code = NULL;
5432 tree extra_init = NULL_TREE;
5435 /* Things that are going to be initialized need to have complete
5437 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5439 if (DECL_HAS_VALUE_EXPR_P (decl))
5441 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5442 it doesn't have storage to be initialized. */
5443 gcc_assert (init == NULL_TREE);
5447 if (type == error_mark_node)
5448 /* We will have already complained. */
5451 if (TREE_CODE (type) == ARRAY_TYPE)
5453 if (check_array_initializer (decl, type, init))
5456 else if (!COMPLETE_TYPE_P (type))
5458 error ("%qD has incomplete type", decl);
5459 TREE_TYPE (decl) = error_mark_node;
5463 /* There is no way to make a variable-sized class type in GNU C++. */
5464 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5466 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5468 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5469 if (SCALAR_TYPE_P (type))
5473 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5474 init = build_zero_init (type, NULL_TREE, false);
5476 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5478 error ("scalar object %qD requires one element in initializer",
5480 TREE_TYPE (decl) = error_mark_node;
5486 if (TREE_CODE (decl) == CONST_DECL)
5488 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5490 DECL_INITIAL (decl) = init;
5492 gcc_assert (init != NULL_TREE);
5495 else if (!init && DECL_REALLY_EXTERN (decl))
5497 else if (TREE_CODE (type) == REFERENCE_TYPE)
5498 init = grok_reference_init (decl, type, init, cleanup, flags);
5499 else if (init || type_build_ctor_call (type))
5502 check_for_uninitialized_const_var (decl);
5503 /* Do not reshape constructors of vectors (they don't need to be
5505 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5507 if (is_std_init_list (type))
5508 init = build_init_list_var_init (decl, type, init,
5509 &extra_init, cleanup);
5510 else if (TYPE_NON_AGGREGATE_CLASS (type))
5512 /* Don't reshape if the class has constructors. */
5513 if (cxx_dialect == cxx98)
5514 error ("in C++98 %qD must be initialized by constructor, "
5518 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5520 error ("opaque vector types cannot be initialized");
5521 init = error_mark_node;
5525 init = reshape_init (type, init, tf_warning_or_error);
5526 if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
5527 check_narrowing (type, init);
5531 /* If DECL has an array type without a specific bound, deduce the
5532 array size from the initializer. */
5533 maybe_deduce_size_from_array_init (decl, init);
5534 type = TREE_TYPE (decl);
5535 if (type == error_mark_node)
5538 if (type_build_ctor_call (type)
5539 || (CLASS_TYPE_P (type)
5540 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5542 init_code = build_aggr_init_full_exprs (decl, init, flags);
5544 /* If this is a constexpr initializer, expand_default_init will
5545 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5546 case, pull the initializer back out and pass it down into
5547 store_init_value. */
5548 while (TREE_CODE (init_code) == EXPR_STMT
5549 || TREE_CODE (init_code) == CONVERT_EXPR)
5550 init_code = TREE_OPERAND (init_code, 0);
5551 if (TREE_CODE (init_code) == INIT_EXPR)
5553 init = TREE_OPERAND (init_code, 1);
5554 init_code = NULL_TREE;
5555 /* Don't call digest_init; it's unnecessary and will complain
5556 about aggregate initialization of non-aggregate classes. */
5557 flags |= LOOKUP_ALREADY_DIGESTED;
5559 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5561 /* Declared constexpr, but no suitable initializer; massage
5562 init appropriately so we can pass it into store_init_value
5564 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5565 init = finish_compound_literal (type, init,
5566 tf_warning_or_error);
5567 else if (CLASS_TYPE_P (type)
5568 && (!init || TREE_CODE (init) == TREE_LIST))
5570 init = build_functional_cast (type, init, tf_none);
5571 if (init != error_mark_node)
5572 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5574 init_code = NULL_TREE;
5580 if (init && TREE_CODE (init) != TREE_VEC)
5582 init_code = store_init_value (decl, init, flags);
5583 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5584 && DECL_INITIAL (decl)
5585 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5586 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5587 warning (0, "array %qD initialized by parenthesized string literal %qE",
5588 decl, DECL_INITIAL (decl));
5594 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5595 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5596 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5597 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5600 check_for_uninitialized_const_var (decl);
5603 if (init && init != error_mark_node)
5604 init_code = build2 (INIT_EXPR, type, decl, init);
5607 init_code = add_stmt_to_compound (extra_init, init_code);
5609 if (init_code && DECL_IN_AGGR_P (decl))
5611 static int explained = 0;
5613 if (cxx_dialect < cxx0x)
5614 error ("initializer invalid for static member with constructor");
5616 error ("non-constant in-class initialization invalid for static "
5617 "member %qD", decl);
5620 error ("(an out of class initialization is required)");
5628 /* If DECL is not a local variable, give it RTL. */
5631 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5633 int toplev = toplevel_bindings_p ();
5635 const char *filename;
5637 /* Set the DECL_ASSEMBLER_NAME for the object. */
5640 /* The `register' keyword, when used together with an
5641 asm-specification, indicates that the variable should be
5642 placed in a particular register. */
5643 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5645 set_user_assembler_name (decl, asmspec);
5646 DECL_HARD_REGISTER (decl) = 1;
5650 if (TREE_CODE (decl) == FUNCTION_DECL
5651 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5652 set_builtin_user_assembler_name (decl, asmspec);
5653 set_user_assembler_name (decl, asmspec);
5657 /* Handle non-variables up front. */
5658 if (TREE_CODE (decl) != VAR_DECL)
5660 rest_of_decl_compilation (decl, toplev, at_eof);
5664 /* If we see a class member here, it should be a static data
5666 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5668 gcc_assert (TREE_STATIC (decl));
5669 /* An in-class declaration of a static data member should be
5670 external; it is only a declaration, and not a definition. */
5671 if (init == NULL_TREE)
5672 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5675 /* We don't create any RTL for local variables. */
5676 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5679 /* We defer emission of local statics until the corresponding
5680 DECL_EXPR is expanded. */
5681 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5683 /* We try to defer namespace-scope static constants so that they are
5684 not emitted into the object file unnecessarily. */
5685 filename = input_filename;
5686 if (!DECL_VIRTUAL_P (decl)
5687 && TREE_READONLY (decl)
5688 && DECL_INITIAL (decl) != NULL_TREE
5689 && DECL_INITIAL (decl) != error_mark_node
5691 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5693 && !TREE_PUBLIC (decl))
5695 /* Fool with the linkage of static consts according to #pragma
5697 struct c_fileinfo *finfo = get_fileinfo (filename);
5698 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5700 TREE_PUBLIC (decl) = 1;
5701 DECL_EXTERNAL (decl) = finfo->interface_only;
5706 /* Likewise for template instantiations. */
5707 else if (DECL_LANG_SPECIFIC (decl)
5708 && DECL_IMPLICIT_INSTANTIATION (decl))
5711 /* If we're not deferring, go ahead and assemble the variable. */
5713 rest_of_decl_compilation (decl, toplev, at_eof);
5716 /* walk_tree helper for wrap_temporary_cleanups, below. */
5719 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5721 /* Stop at types or full-expression boundaries. */
5722 if (TYPE_P (*stmt_p)
5723 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5729 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5731 tree guard = (tree)data;
5732 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5734 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5735 /* Tell honor_protect_cleanup_actions to handle this as a separate
5737 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5739 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5745 /* We're initializing a local variable which has a cleanup GUARD. If there
5746 are any temporaries used in the initializer INIT of this variable, we
5747 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5748 variable will be cleaned up properly if one of them throws.
5750 Unfortunately, there's no way to express this properly in terms of
5751 nesting, as the regions for the temporaries overlap the region for the
5752 variable itself; if there are two temporaries, the variable needs to be
5753 the first thing destroyed if either of them throws. However, we only
5754 want to run the variable's cleanup if it actually got constructed. So
5755 we need to guard the temporary cleanups with the variable's cleanup if
5756 they are run on the normal path, but not if they are run on the
5757 exceptional path. We implement this by telling
5758 honor_protect_cleanup_actions to strip the variable cleanup from the
5759 exceptional path. */
5762 wrap_temporary_cleanups (tree init, tree guard)
5764 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5767 /* Generate code to initialize DECL (a local variable). */
5770 initialize_local_var (tree decl, tree init)
5772 tree type = TREE_TYPE (decl);
5776 gcc_assert (TREE_CODE (decl) == VAR_DECL
5777 || TREE_CODE (decl) == RESULT_DECL);
5778 gcc_assert (!TREE_STATIC (decl));
5780 if (DECL_SIZE (decl) == NULL_TREE)
5782 /* If we used it already as memory, it must stay in memory. */
5783 DECL_INITIAL (decl) = NULL_TREE;
5784 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5788 if (type == error_mark_node)
5791 /* Compute and store the initial value. */
5792 already_used = TREE_USED (decl) || TREE_USED (type);
5793 if (TREE_USED (type))
5794 DECL_READ_P (decl) = 1;
5796 /* Generate a cleanup, if necessary. */
5797 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5799 /* Perform the initialization. */
5802 if (TREE_CODE (init) == INIT_EXPR
5803 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5805 /* Stick simple initializers in DECL_INITIAL so that
5806 -Wno-init-self works (c++/34772). */
5807 gcc_assert (TREE_OPERAND (init, 0) == decl);
5808 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5812 int saved_stmts_are_full_exprs_p;
5814 /* If we're only initializing a single object, guard the
5815 destructors of any temporaries used in its initializer with
5816 its destructor. This isn't right for arrays because each
5817 element initialization is a full-expression. */
5818 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5819 wrap_temporary_cleanups (init, cleanup);
5821 gcc_assert (building_stmt_list_p ());
5822 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5823 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5824 finish_expr_stmt (init);
5825 current_stmt_tree ()->stmts_are_full_exprs_p =
5826 saved_stmts_are_full_exprs_p;
5830 /* Set this to 0 so we can tell whether an aggregate which was
5831 initialized was ever used. Don't do this if it has a
5832 destructor, so we don't complain about the 'resource
5833 allocation is initialization' idiom. Now set
5834 attribute((unused)) on types so decls of that type will be
5835 marked used. (see TREE_USED, above.) */
5836 if (TYPE_NEEDS_CONSTRUCTING (type)
5838 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5839 && DECL_NAME (decl))
5840 TREE_USED (decl) = 0;
5841 else if (already_used)
5842 TREE_USED (decl) = 1;
5845 finish_decl_cleanup (decl, cleanup);
5848 /* DECL is a VAR_DECL for a compiler-generated variable with static
5849 storage duration (like a virtual table) whose initializer is a
5850 compile-time constant. Initialize the variable and provide it to the
5854 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5857 gcc_assert (DECL_ARTIFICIAL (decl));
5858 init = build_constructor (TREE_TYPE (decl), v);
5859 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5860 DECL_INITIAL (decl) = init;
5861 DECL_INITIALIZED_P (decl) = 1;
5862 determine_visibility (decl);
5863 layout_var_decl (decl);
5864 maybe_commonize_var (decl);
5865 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5868 /* INIT is the initializer for a variable, as represented by the
5869 parser. Returns true iff INIT is type-dependent. */
5872 type_dependent_init_p (tree init)
5874 if (TREE_CODE (init) == TREE_LIST)
5875 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5876 return any_type_dependent_elements_p (init);
5877 else if (TREE_CODE (init) == CONSTRUCTOR)
5878 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5880 VEC(constructor_elt, gc) *elts;
5884 elts = CONSTRUCTOR_ELTS (init);
5885 nelts = VEC_length (constructor_elt, elts);
5886 for (i = 0; i < nelts; ++i)
5887 if (type_dependent_init_p (VEC_index (constructor_elt,
5892 /* It must be a simple expression, e.g., int i = 3; */
5893 return type_dependent_expression_p (init);
5898 /* INIT is the initializer for a variable, as represented by the
5899 parser. Returns true iff INIT is value-dependent. */
5902 value_dependent_init_p (tree init)
5904 if (TREE_CODE (init) == TREE_LIST)
5905 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5906 return any_value_dependent_elements_p (init);
5907 else if (TREE_CODE (init) == CONSTRUCTOR)
5908 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5910 VEC(constructor_elt, gc) *elts;
5914 elts = CONSTRUCTOR_ELTS (init);
5915 nelts = VEC_length (constructor_elt, elts);
5916 for (i = 0; i < nelts; ++i)
5917 if (value_dependent_init_p (VEC_index (constructor_elt,
5922 /* It must be a simple expression, e.g., int i = 3; */
5923 return value_dependent_expression_p (init);
5928 /* Finish processing of a declaration;
5929 install its line number and initial value.
5930 If the length of an array type is not known before,
5931 it must be determined now, from the initial value, or it is an error.
5933 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5934 true, then INIT is an integral constant expression.
5936 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5937 if the (init) syntax was used. */
5940 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5941 tree asmspec_tree, int flags)
5945 const char *asmspec = NULL;
5946 int was_readonly = 0;
5947 bool var_definition_p = false;
5950 if (decl == error_mark_node)
5955 error ("assignment (not initialization) in declaration");
5959 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5960 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5961 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5963 type = TREE_TYPE (decl);
5964 if (type == error_mark_node)
5967 /* Assume no cleanup is required. */
5968 cleanup = NULL_TREE;
5970 /* If a name was specified, get the string. */
5971 if (at_namespace_scope_p ())
5972 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5973 if (asmspec_tree && asmspec_tree != error_mark_node)
5974 asmspec = TREE_STRING_POINTER (asmspec_tree);
5976 if (current_class_type
5977 && CP_DECL_CONTEXT (decl) == current_class_type
5978 && TYPE_BEING_DEFINED (current_class_type)
5979 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5980 && (DECL_INITIAL (decl) || init))
5981 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5983 auto_node = type_uses_auto (type);
5987 if (init == NULL_TREE)
5989 error ("declaration of %q#D has no initializer", decl);
5990 TREE_TYPE (decl) = error_mark_node;
5994 if (TREE_CODE (d_init) == TREE_LIST)
5995 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5996 tf_warning_or_error);
5997 d_init = resolve_nondeduced_context (d_init);
5998 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6000 if (type == error_mark_node)
6004 if (!ensure_literal_type_for_constexpr_object (decl))
6005 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6007 if (TREE_CODE (decl) == VAR_DECL
6008 && DECL_CLASS_SCOPE_P (decl)
6009 && DECL_INITIALIZED_IN_CLASS_P (decl))
6010 check_static_variable_definition (decl, type);
6012 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6015 if (init == ridpointers[(int)RID_DELETE])
6017 /* FIXME check this is 1st decl. */
6018 DECL_DELETED_FN (decl) = 1;
6019 DECL_DECLARED_INLINE_P (decl) = 1;
6020 DECL_INITIAL (decl) = error_mark_node;
6021 FOR_EACH_CLONE (clone, decl)
6023 DECL_DELETED_FN (clone) = 1;
6024 DECL_DECLARED_INLINE_P (clone) = 1;
6025 DECL_INITIAL (clone) = error_mark_node;
6029 else if (init == ridpointers[(int)RID_DEFAULT])
6031 if (defaultable_fn_check (decl))
6032 DECL_DEFAULTED_FN (decl) = 1;
6034 DECL_INITIAL (decl) = NULL_TREE;
6038 if (init && TREE_CODE (decl) == VAR_DECL)
6040 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6041 /* If DECL is a reference, then we want to know whether init is a
6042 reference constant; init_const_expr_p as passed tells us whether
6043 it's an rvalue constant. */
6044 if (TREE_CODE (type) == REFERENCE_TYPE)
6045 init_const_expr_p = potential_constant_expression (init);
6046 if (init_const_expr_p)
6048 /* Set these flags now for templates. We'll update the flags in
6049 store_init_value for instantiations. */
6050 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6051 if (decl_maybe_constant_var_p (decl))
6052 TREE_CONSTANT (decl) = 1;
6056 if (processing_template_decl)
6058 bool type_dependent_p;
6060 /* Add this declaration to the statement-tree. */
6061 if (at_function_scope_p ())
6062 add_decl_expr (decl);
6064 type_dependent_p = dependent_type_p (type);
6066 if (check_for_bare_parameter_packs (init))
6069 DECL_INITIAL (decl) = NULL_TREE;
6072 /* Generally, initializers in templates are expanded when the
6073 template is instantiated. But, if DECL is a variable constant
6074 then it can be used in future constant expressions, so its value
6075 must be available. */
6077 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6078 /* We can't do anything if the decl has dependent type. */;
6080 && init_const_expr_p
6081 && !type_dependent_p
6082 && decl_maybe_constant_var_p (decl)
6083 && !type_dependent_init_p (init)
6084 && !value_dependent_init_p (init))
6086 /* This variable seems to be a non-dependent constant, so process
6087 its initializer. If check_initializer returns non-null the
6088 initialization wasn't constant after all. */
6089 tree init_code = check_initializer (decl, init, flags, &cleanup);
6090 if (init_code == NULL_TREE)
6093 else if (!DECL_PRETTY_FUNCTION_P (decl))
6094 /* Deduce array size even if the initializer is dependent. */
6095 maybe_deduce_size_from_array_init (decl, init);
6098 DECL_INITIAL (decl) = init;
6102 /* Just store non-static data member initializers for later. */
6103 if (init && TREE_CODE (decl) == FIELD_DECL)
6104 DECL_INITIAL (decl) = init;
6106 /* Take care of TYPE_DECLs up front. */
6107 if (TREE_CODE (decl) == TYPE_DECL)
6109 if (type != error_mark_node
6110 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6112 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6113 warning (0, "shadowing previous type declaration of %q#D", decl);
6114 set_identifier_type_value (DECL_NAME (decl), decl);
6117 /* If we have installed this as the canonical typedef for this
6118 type, and that type has not been defined yet, delay emitting
6119 the debug information for it, as we will emit it later. */
6120 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6121 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6122 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6124 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6129 /* A reference will be modified here, as it is initialized. */
6130 if (! DECL_EXTERNAL (decl)
6131 && TREE_READONLY (decl)
6132 && TREE_CODE (type) == REFERENCE_TYPE)
6135 TREE_READONLY (decl) = 0;
6138 if (TREE_CODE (decl) == VAR_DECL)
6140 /* Only variables with trivial initialization and destruction can
6141 have thread-local storage. */
6142 if (DECL_THREAD_LOCAL_P (decl)
6143 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6144 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6145 error ("%qD cannot be thread-local because it has non-trivial "
6146 "type %qT", decl, TREE_TYPE (decl));
6147 /* If this is a local variable that will need a mangled name,
6148 register it now. We must do this before processing the
6149 initializer for the variable, since the initialization might
6150 require a guard variable, and since the mangled name of the
6151 guard variable will depend on the mangled name of this
6153 if (DECL_FUNCTION_SCOPE_P (decl)
6154 && TREE_STATIC (decl)
6155 && !DECL_ARTIFICIAL (decl))
6157 push_local_name (decl);
6158 if (DECL_CONSTRUCTOR_P (current_function_decl)
6159 || DECL_DESTRUCTOR_P (current_function_decl))
6160 /* Normally local_decls is populated during GIMPLE lowering,
6161 but [cd]tors are never actually compiled directly. We need
6162 to put statics on the list so we can deal with the label
6163 address extension. */
6164 add_local_decl (cfun, decl);
6167 /* Convert the initializer to the type of DECL, if we have not
6168 already initialized DECL. */
6169 if (!DECL_INITIALIZED_P (decl)
6170 /* If !DECL_EXTERNAL then DECL is being defined. In the
6171 case of a static data member initialized inside the
6172 class-specifier, there can be an initializer even if DECL
6173 is *not* defined. */
6174 && (!DECL_EXTERNAL (decl) || init))
6176 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6179 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6180 /* Allow libjava/prims.cc define primitive classes. */
6181 if (init != NULL_TREE
6182 || jclass == NULL_TREE
6183 || TREE_CODE (jclass) != TYPE_DECL
6184 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6185 || !same_type_ignoring_top_level_qualifiers_p
6186 (type, TREE_TYPE (TREE_TYPE (jclass))))
6187 error ("Java object %qD not allocated with %<new%>", decl);
6190 init = check_initializer (decl, init, flags, &cleanup);
6191 /* Thread-local storage cannot be dynamically initialized. */
6192 if (DECL_THREAD_LOCAL_P (decl) && init)
6194 error ("%qD is thread-local and so cannot be dynamically "
6195 "initialized", decl);
6199 /* Check that the initializer for a static data member was a
6200 constant. Although we check in the parser that the
6201 initializer is an integral constant expression, we do not
6202 simplify division-by-zero at the point at which it
6203 occurs. Therefore, in:
6205 struct S { static const int i = 7 / 0; };
6207 we issue an error at this point. It would
6208 probably be better to forbid division by zero in
6209 integral constant expressions. */
6210 if (DECL_EXTERNAL (decl) && init)
6212 error ("%qD cannot be initialized by a non-constant expression"
6213 " when being declared", decl);
6214 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6222 The memory occupied by any object of static storage
6223 duration is zero-initialized at program startup before
6224 any other initialization takes place.
6226 We cannot create an appropriate initializer until after
6227 the type of DECL is finalized. If DECL_INITIAL is set,
6228 then the DECL is statically initialized, and any
6229 necessary zero-initialization has already been performed. */
6230 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6231 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6232 /*nelts=*/NULL_TREE,
6233 /*static_storage_p=*/true);
6234 /* Remember that the initialization for this variable has
6236 DECL_INITIALIZED_P (decl) = 1;
6237 /* This declaration is the definition of this variable,
6238 unless we are initializing a static data member within
6239 the class specifier. */
6240 if (!DECL_EXTERNAL (decl))
6241 var_definition_p = true;
6243 /* If the variable has an array type, lay out the type, even if
6244 there is no initializer. It is valid to index through the
6245 array, and we must get TYPE_ALIGN set correctly on the array
6247 else if (TREE_CODE (type) == ARRAY_TYPE)
6250 if (TREE_STATIC (decl)
6251 && !at_function_scope_p ()
6252 && current_function_decl == NULL)
6253 /* So decl is a global variable or a static member of a
6254 non local class. Record the types it uses
6255 so that we can decide later to emit debug info for them. */
6256 record_types_used_by_current_var_decl (decl);
6258 else if (TREE_CODE (decl) == FIELD_DECL
6259 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6260 error ("non-static data member %qD has Java class type", decl);
6262 /* Add this declaration to the statement-tree. This needs to happen
6263 after the call to check_initializer so that the DECL_EXPR for a
6264 reference temp is added before the DECL_EXPR for the reference itself. */
6265 if (DECL_FUNCTION_SCOPE_P (decl))
6266 add_decl_expr (decl);
6268 /* Let the middle end know about variables and functions -- but not
6269 static data members in uninstantiated class templates. */
6270 if (TREE_CODE (decl) == VAR_DECL
6271 || TREE_CODE (decl) == FUNCTION_DECL)
6273 if (TREE_CODE (decl) == VAR_DECL)
6275 layout_var_decl (decl);
6276 maybe_commonize_var (decl);
6279 /* This needs to happen after the linkage is set. */
6280 determine_visibility (decl);
6282 if (var_definition_p && TREE_STATIC (decl))
6284 /* If a TREE_READONLY variable needs initialization
6285 at runtime, it is no longer readonly and we need to
6286 avoid MEM_READONLY_P being set on RTL created for it. */
6289 if (TREE_READONLY (decl))
6290 TREE_READONLY (decl) = 0;
6293 else if (was_readonly)
6294 TREE_READONLY (decl) = 1;
6297 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6299 /* Check for abstractness of the type. Notice that there is no
6300 need to strip array types here since the check for those types
6301 is already done within create_array_type_for_decl. */
6302 if (TREE_CODE (type) == FUNCTION_TYPE
6303 || TREE_CODE (type) == METHOD_TYPE)
6304 abstract_virtuals_error (decl, TREE_TYPE (type));
6306 abstract_virtuals_error (decl, type);
6308 if (TREE_TYPE (decl) == error_mark_node)
6309 /* No initialization required. */
6311 else if (TREE_CODE (decl) == FUNCTION_DECL)
6315 if (init == ridpointers[(int)RID_DEFAULT])
6317 /* An out-of-class default definition is defined at
6318 the point where it is explicitly defaulted. */
6319 if (DECL_DELETED_FN (decl))
6320 maybe_explain_implicit_delete (decl);
6321 else if (DECL_INITIAL (decl) == error_mark_node)
6322 synthesize_method (decl);
6325 error ("function %q#D is initialized like a variable", decl);
6327 /* else no initialization required. */
6329 else if (DECL_EXTERNAL (decl)
6330 && ! (DECL_LANG_SPECIFIC (decl)
6331 && DECL_NOT_REALLY_EXTERN (decl)))
6334 DECL_INITIAL (decl) = init;
6336 /* A variable definition. */
6337 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6338 /* Initialize the local variable. */
6339 initialize_local_var (decl, init);
6341 /* If a variable is defined, and then a subsequent
6342 definition with external linkage is encountered, we will
6343 get here twice for the same variable. We want to avoid
6344 calling expand_static_init more than once. For variables
6345 that are not static data members, we can call
6346 expand_static_init only when we actually process the
6347 initializer. It is not legal to redeclare a static data
6348 member, so this issue does not arise in that case. */
6349 else if (var_definition_p && TREE_STATIC (decl))
6350 expand_static_init (decl, init);
6353 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6354 reference, insert it in the statement-tree now. */
6356 push_cleanup (decl, cleanup, false);
6359 TREE_READONLY (decl) = 1;
6361 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6364 /* Returns a declaration for a VAR_DECL as if:
6366 extern "C" TYPE NAME;
6368 had been seen. Used to create compiler-generated global
6372 declare_global_var (tree name, tree type)
6376 push_to_top_level ();
6377 decl = build_decl (input_location, VAR_DECL, name, type);
6378 TREE_PUBLIC (decl) = 1;
6379 DECL_EXTERNAL (decl) = 1;
6380 DECL_ARTIFICIAL (decl) = 1;
6381 /* If the user has explicitly declared this variable (perhaps
6382 because the code we are compiling is part of a low-level runtime
6383 library), then it is possible that our declaration will be merged
6384 with theirs by pushdecl. */
6385 decl = pushdecl (decl);
6386 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6387 pop_from_top_level ();
6392 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6393 if "__cxa_atexit" is not being used) corresponding to the function
6394 to be called when the program exits. */
6397 get_atexit_fn_ptr_type (void)
6401 if (!atexit_fn_ptr_type_node)
6404 if (flag_use_cxa_atexit
6405 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6406 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6407 arg_type = ptr_type_node;
6409 /* The parameter to "atexit" is "void (*)(void)". */
6410 arg_type = NULL_TREE;
6412 fn_type = build_function_type_list (void_type_node,
6413 arg_type, NULL_TREE);
6414 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6417 return atexit_fn_ptr_type_node;
6420 /* Returns a pointer to the `atexit' function. Note that if
6421 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6422 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6425 get_atexit_node (void)
6431 bool use_aeabi_atexit;
6436 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6438 /* The declaration for `__cxa_atexit' is:
6440 int __cxa_atexit (void (*)(void *), void *, void *)
6442 We build up the argument types and then the function type
6444 tree argtype0, argtype1, argtype2;
6446 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6447 /* First, build the pointer-to-function type for the first
6449 fn_ptr_type = get_atexit_fn_ptr_type ();
6450 /* Then, build the rest of the argument types. */
6451 argtype2 = ptr_type_node;
6452 if (use_aeabi_atexit)
6454 argtype1 = fn_ptr_type;
6455 argtype0 = ptr_type_node;
6459 argtype1 = ptr_type_node;
6460 argtype0 = fn_ptr_type;
6462 /* And the final __cxa_atexit type. */
6463 fn_type = build_function_type_list (integer_type_node,
6464 argtype0, argtype1, argtype2,
6466 fn_ptr_type = build_pointer_type (fn_type);
6467 if (use_aeabi_atexit)
6468 name = "__aeabi_atexit";
6470 name = "__cxa_atexit";
6474 /* The declaration for `atexit' is:
6476 int atexit (void (*)());
6478 We build up the argument types and then the function type
6480 fn_ptr_type = get_atexit_fn_ptr_type ();
6481 /* Build the final atexit type. */
6482 fn_type = build_function_type_list (integer_type_node,
6483 fn_ptr_type, NULL_TREE);
6487 /* Now, build the function declaration. */
6488 push_lang_context (lang_name_c);
6489 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6490 mark_used (atexit_fndecl);
6491 pop_lang_context ();
6492 atexit_node = decay_conversion (atexit_fndecl);
6497 /* Returns the __dso_handle VAR_DECL. */
6500 get_dso_handle_node (void)
6502 if (dso_handle_node)
6503 return dso_handle_node;
6505 /* Declare the variable. */
6506 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6509 #ifdef HAVE_GAS_HIDDEN
6510 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6511 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6514 return dso_handle_node;
6517 /* Begin a new function with internal linkage whose job will be simply
6518 to destroy some particular variable. */
6520 static GTY(()) int start_cleanup_cnt;
6523 start_cleanup_fn (void)
6528 bool use_cxa_atexit = flag_use_cxa_atexit
6529 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6531 push_to_top_level ();
6533 /* No need to mangle this. */
6534 push_lang_context (lang_name_c);
6536 /* Build the name of the function. */
6537 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6538 /* Build the function declaration. */
6539 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6540 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6541 /* It's a function with internal linkage, generated by the
6543 TREE_PUBLIC (fndecl) = 0;
6544 DECL_ARTIFICIAL (fndecl) = 1;
6545 /* Make the function `inline' so that it is only emitted if it is
6546 actually needed. It is unlikely that it will be inlined, since
6547 it is only called via a function pointer, but we avoid unnecessary
6548 emissions this way. */
6549 DECL_DECLARED_INLINE_P (fndecl) = 1;
6550 DECL_INTERFACE_KNOWN (fndecl) = 1;
6551 /* Build the parameter. */
6556 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6557 DECL_CONTEXT (parmdecl) = fndecl;
6558 TREE_USED (parmdecl) = 1;
6559 DECL_READ_P (parmdecl) = 1;
6560 DECL_ARGUMENTS (fndecl) = parmdecl;
6564 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6566 pop_lang_context ();
6568 return current_function_decl;
6571 /* Finish the cleanup function begun by start_cleanup_fn. */
6574 end_cleanup_fn (void)
6576 expand_or_defer_fn (finish_function (0));
6578 pop_from_top_level ();
6581 /* Generate code to handle the destruction of DECL, an object with
6582 static storage duration. */
6585 register_dtor_fn (tree decl)
6592 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6594 type = TREE_TYPE (decl);
6595 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6596 return void_zero_node;
6598 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6599 a class object, we can just pass the destructor to
6600 "__cxa_atexit"; we don't have to build a temporary function to do
6602 use_dtor = (flag_use_cxa_atexit
6603 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6604 && CLASS_TYPE_P (type));
6609 /* Find the destructor. */
6610 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6611 gcc_assert (idx >= 0);
6612 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6613 /* Make sure it is accessible. */
6614 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6618 /* Call build_cleanup before we enter the anonymous function so
6619 that any access checks will be done relative to the current
6620 scope, rather than the scope of the anonymous function. */
6621 build_cleanup (decl);
6623 /* Now start the function. */
6624 cleanup = start_cleanup_fn ();
6626 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6627 to the original function, rather than the anonymous one. That
6628 will make the back end think that nested functions are in use,
6629 which causes confusion. */
6630 push_deferring_access_checks (dk_no_check);
6631 fcall = build_cleanup (decl);
6632 pop_deferring_access_checks ();
6634 /* Create the body of the anonymous function. */
6635 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6636 finish_expr_stmt (fcall);
6637 finish_compound_stmt (compound_stmt);
6641 /* Call atexit with the cleanup function. */
6642 mark_used (cleanup);
6643 cleanup = build_address (cleanup);
6644 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6650 /* We must convert CLEANUP to the type that "__cxa_atexit"
6652 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6653 /* "__cxa_atexit" will pass the address of DECL to the
6654 cleanup function. */
6656 addr = build_address (decl);
6657 /* The declared type of the parameter to "__cxa_atexit" is
6658 "void *". For plain "T*", we could just let the
6659 machinery in cp_build_function_call convert it -- but if the
6660 type is "cv-qualified T *", then we need to convert it
6661 before passing it in, to avoid spurious errors. */
6662 addr = build_nop (ptr_type_node, addr);
6665 /* Since the cleanup functions we build ignore the address
6666 they're given, there's no reason to pass the actual address
6667 in, and, in general, it's cheaper to pass NULL than any
6669 addr = null_pointer_node;
6670 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6671 tf_warning_or_error);
6672 if (targetm.cxx.use_aeabi_atexit ())
6685 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6686 arg0, arg1, arg2, NULL_TREE);
6689 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6690 is its initializer. Generate code to handle the construction
6691 and destruction of DECL. */
6694 expand_static_init (tree decl, tree init)
6696 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6697 gcc_assert (TREE_STATIC (decl));
6699 /* Some variables require no dynamic initialization. */
6701 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6704 if (DECL_FUNCTION_SCOPE_P (decl))
6706 /* Emit code to perform this initialization but once. */
6707 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6708 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6709 tree guard, guard_addr;
6712 /* Emit code to perform this initialization but once. This code
6715 static <type> guard;
6716 if (!guard.first_byte) {
6717 if (__cxa_guard_acquire (&guard)) {
6720 // Do initialization.
6721 flag = true; __cxa_guard_release (&guard);
6722 // Register variable for destruction at end of program.
6724 if (!flag) __cxa_guard_abort (&guard);
6728 Note that the `flag' variable is only set to 1 *after* the
6729 initialization is complete. This ensures that an exception,
6730 thrown during the construction, will cause the variable to
6731 reinitialized when we pass through this code again, as per:
6735 If the initialization exits by throwing an exception, the
6736 initialization is not complete, so it will be tried again
6737 the next time control enters the declaration.
6739 This process should be thread-safe, too; multiple threads
6740 should not be able to initialize the variable more than
6743 /* Create the guard variable. */
6744 guard = get_guard (decl);
6746 /* This optimization isn't safe on targets with relaxed memory
6747 consistency. On such targets we force synchronization in
6748 __cxa_guard_acquire. */
6749 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6751 /* Begin the conditional initialization. */
6752 if_stmt = begin_if_stmt ();
6753 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6754 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6757 if (flag_threadsafe_statics)
6759 tree vfntype = NULL_TREE;
6760 tree acquire_name, release_name, abort_name;
6761 tree acquire_fn, release_fn, abort_fn;
6762 guard_addr = build_address (guard);
6764 acquire_name = get_identifier ("__cxa_guard_acquire");
6765 release_name = get_identifier ("__cxa_guard_release");
6766 abort_name = get_identifier ("__cxa_guard_abort");
6767 acquire_fn = identifier_global_value (acquire_name);
6768 release_fn = identifier_global_value (release_name);
6769 abort_fn = identifier_global_value (abort_name);
6771 acquire_fn = push_library_fn
6772 (acquire_name, build_function_type_list (integer_type_node,
6773 TREE_TYPE (guard_addr),
6776 if (!release_fn || !abort_fn)
6777 vfntype = build_function_type_list (void_type_node,
6778 TREE_TYPE (guard_addr),
6781 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6783 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6785 inner_if_stmt = begin_if_stmt ();
6786 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6789 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6790 begin = get_target_expr (boolean_false_node);
6791 flag = TARGET_EXPR_SLOT (begin);
6793 TARGET_EXPR_CLEANUP (begin)
6794 = build3 (COND_EXPR, void_type_node, flag,
6796 build_call_n (abort_fn, 1, guard_addr));
6797 CLEANUP_EH_ONLY (begin) = 1;
6799 /* Do the initialization itself. */
6800 init = add_stmt_to_compound (begin, init);
6801 init = add_stmt_to_compound
6802 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6803 init = add_stmt_to_compound
6804 (init, build_call_n (release_fn, 1, guard_addr));
6807 init = add_stmt_to_compound (init, set_guard (guard));
6809 /* Use atexit to register a function for destroying this static
6811 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6813 finish_expr_stmt (init);
6815 if (flag_threadsafe_statics)
6817 finish_compound_stmt (inner_then_clause);
6818 finish_then_clause (inner_if_stmt);
6819 finish_if_stmt (inner_if_stmt);
6822 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6824 finish_compound_stmt (then_clause);
6825 finish_then_clause (if_stmt);
6826 finish_if_stmt (if_stmt);
6830 static_aggregates = tree_cons (init, decl, static_aggregates);
6834 /* Make TYPE a complete type based on INITIAL_VALUE.
6835 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6836 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6837 3 if the initializer list is empty (in pedantic mode). */
6840 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6843 tree type, elt_type;
6847 unsigned HOST_WIDE_INT i;
6850 /* An array of character type can be initialized from a
6851 brace-enclosed string constant.
6853 FIXME: this code is duplicated from reshape_init. Probably
6854 we should just call reshape_init here? */
6855 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6856 && TREE_CODE (initial_value) == CONSTRUCTOR
6857 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6859 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6860 tree value = VEC_index (constructor_elt, v, 0)->value;
6862 if (TREE_CODE (value) == STRING_CST
6863 && VEC_length (constructor_elt, v) == 1)
6864 initial_value = value;
6867 /* If any of the elements are parameter packs, we can't actually
6868 complete this type now because the array size is dependent. */
6869 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6871 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6874 if (PACK_EXPANSION_P (value))
6880 failure = complete_array_type (ptype, initial_value, do_default);
6882 /* We can create the array before the element type is complete, which
6883 means that we didn't have these two bits set in the original type
6884 either. In completing the type, we are expected to propagate these
6885 bits. See also complete_type which does the same thing for arrays
6888 if (TYPE_DOMAIN (type))
6890 elt_type = TREE_TYPE (type);
6891 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6892 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6893 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6899 /* As above, but either give an error or reject zero-size arrays, depending
6903 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6904 bool do_default, tsubst_flags_t complain)
6907 bool sfinae = !(complain & tf_error);
6908 /* In SFINAE context we can't be lenient about zero-size arrays. */
6911 failure = cp_complete_array_type (ptype, initial_value, do_default);
6917 /* Not an error. */;
6918 else if (failure == 1)
6919 error ("initializer fails to determine size of %qT", *ptype);
6920 else if (failure == 2)
6923 error ("array size missing in %qT", *ptype);
6925 else if (failure == 3)
6926 error ("zero-size array %qT", *ptype);
6927 *ptype = error_mark_node;
6932 /* Return zero if something is declared to be a member of type
6933 CTYPE when in the context of CUR_TYPE. STRING is the error
6934 message to print in that case. Otherwise, quietly return 1. */
6937 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6939 if (ctype && ctype != cur_type)
6941 if (flags == DTOR_FLAG)
6942 error ("destructor for alien class %qT cannot be a member", ctype);
6944 error ("constructor for alien class %qT cannot be a member", ctype);
6950 /* Subroutine of `grokdeclarator'. */
6952 /* Generate errors possibly applicable for a given set of specifiers.
6953 This is for ARM $7.1.2. */
6956 bad_specifiers (tree object,
6957 enum bad_spec_place type,
6968 error ("%qD declared as a %<virtual%> variable", object);
6970 error ("%qD declared as an %<inline%> variable", object);
6972 error ("%<const%> and %<volatile%> function specifiers on "
6973 "%qD invalid in variable declaration", object);
6977 error ("%qD declared as a %<virtual%> parameter", object);
6979 error ("%qD declared as an %<inline%> parameter", object);
6981 error ("%<const%> and %<volatile%> function specifiers on "
6982 "%qD invalid in parameter declaration", object);
6986 error ("%qD declared as a %<virtual%> type", object);
6988 error ("%qD declared as an %<inline%> type", object);
6990 error ("%<const%> and %<volatile%> function specifiers on "
6991 "%qD invalid in type declaration", object);
6995 error ("%qD declared as a %<virtual%> field", object);
6997 error ("%qD declared as an %<inline%> field", object);
6999 error ("%<const%> and %<volatile%> function specifiers on "
7000 "%qD invalid in field declaration", object);
7006 error ("%q+D declared as a friend", object);
7008 && (TREE_CODE (object) == TYPE_DECL
7009 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7010 && !TYPE_REFFN_P (TREE_TYPE (object))
7011 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7012 error ("%q+D declared with an exception specification", object);
7015 /* DECL is a member function or static data member and is presently
7016 being defined. Check that the definition is taking place in a
7020 check_class_member_definition_namespace (tree decl)
7022 /* These checks only apply to member functions and static data
7024 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7025 || TREE_CODE (decl) == VAR_DECL);
7026 /* We check for problems with specializations in pt.c in
7027 check_specialization_namespace, where we can issue better
7029 if (processing_specialization)
7031 /* There are no restrictions on the placement of
7032 explicit instantiations. */
7033 if (processing_explicit_instantiation)
7037 A member function definition that appears outside of the
7038 class definition shall appear in a namespace scope enclosing
7039 the class definition.
7043 The definition for a static data member shall appear in a
7044 namespace scope enclosing the member's class definition. */
7045 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7046 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7047 decl, DECL_CONTEXT (decl));
7050 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7051 METHOD_TYPE for a non-static member function; QUALS are the
7052 cv-qualifiers that apply to the function. */
7055 build_this_parm (tree type, cp_cv_quals quals)
7060 cp_cv_quals this_quals;
7062 if (CLASS_TYPE_P (type))
7065 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7066 this_type = build_pointer_type (this_type);
7069 this_type = type_of_this_parm (type);
7070 /* The `this' parameter is implicitly `const'; it cannot be
7072 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7073 qual_type = cp_build_qualified_type (this_type, this_quals);
7074 parm = build_artificial_parm (this_identifier, qual_type);
7075 cp_apply_type_quals_to_decl (this_quals, parm);
7079 /* DECL is a static member function. Complain if it was declared
7080 with function-cv-quals. */
7083 check_static_quals (tree decl, cp_cv_quals quals)
7085 if (quals != TYPE_UNQUALIFIED)
7086 error ("static member function %q#D declared with type qualifiers",
7090 /* CTYPE is class type, or null if non-class.
7091 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7093 DECLARATOR is the function's name.
7094 PARMS is a chain of PARM_DECLs for the function.
7095 VIRTUALP is truthvalue of whether the function is virtual or not.
7096 FLAGS are to be passed through to `grokclassfn'.
7097 QUALS are qualifiers indicating whether the function is `const'
7099 RAISES is a list of exceptions that this function can raise.
7100 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7101 not look, and -1 if we should not call `grokclassfn' at all.
7103 SFK is the kind of special function (if any) for the new function.
7105 Returns `NULL_TREE' if something goes wrong, after issuing
7106 applicable error messages. */
7109 grokfndecl (tree ctype,
7113 tree orig_declarator,
7115 enum overload_flags flags,
7122 special_function_kind sfk,
7127 location_t location)
7130 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7134 type = build_exception_variant (type, raises);
7136 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7138 /* If we have an explicit location, use it, otherwise use whatever
7139 build_lang_decl used (probably input_location). */
7140 if (location != UNKNOWN_LOCATION)
7141 DECL_SOURCE_LOCATION (decl) = location;
7143 if (TREE_CODE (type) == METHOD_TYPE)
7146 parm = build_this_parm (type, quals);
7147 DECL_CHAIN (parm) = parms;
7150 DECL_ARGUMENTS (decl) = parms;
7151 for (t = parms; t; t = DECL_CHAIN (t))
7152 DECL_CONTEXT (t) = decl;
7153 /* Propagate volatile out from type to decl. */
7154 if (TYPE_VOLATILE (type))
7155 TREE_THIS_VOLATILE (decl) = 1;
7157 /* Setup decl according to sfk. */
7160 case sfk_constructor:
7161 case sfk_copy_constructor:
7162 case sfk_move_constructor:
7163 DECL_CONSTRUCTOR_P (decl) = 1;
7165 case sfk_destructor:
7166 DECL_DESTRUCTOR_P (decl) = 1;
7172 /* If pointers to member functions use the least significant bit to
7173 indicate whether a function is virtual, ensure a pointer
7174 to this function will have that bit clear. */
7175 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7176 && TREE_CODE (type) == METHOD_TYPE
7177 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7178 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7181 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7185 ("defining explicit specialization %qD in friend declaration",
7189 tree fns = TREE_OPERAND (orig_declarator, 0);
7190 tree args = TREE_OPERAND (orig_declarator, 1);
7192 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7194 /* Something like `template <class T> friend void f<T>()'. */
7195 error ("invalid use of template-id %qD in declaration "
7196 "of primary template",
7202 /* A friend declaration of the form friend void f<>(). Record
7203 the information in the TEMPLATE_ID_EXPR. */
7204 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7206 if (TREE_CODE (fns) == COMPONENT_REF)
7208 /* Due to bison parser ickiness, we will have already looked
7209 up an operator_name or PFUNCNAME within the current class
7210 (see template_id in parse.y). If the current class contains
7211 such a name, we'll get a COMPONENT_REF here. Undo that. */
7213 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7214 == current_class_type);
7215 fns = TREE_OPERAND (fns, 1);
7217 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7218 || TREE_CODE (fns) == OVERLOAD);
7219 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7221 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7222 if (TREE_PURPOSE (t)
7223 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7225 error ("default arguments are not allowed in declaration "
7226 "of friend template specialization %qD",
7233 error ("%<inline%> is not allowed in declaration of friend "
7234 "template specialization %qD",
7241 /* If this decl has namespace scope, set that up. */
7243 set_decl_namespace (decl, in_namespace, friendp);
7245 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7247 /* `main' and builtins have implicit 'C' linkage. */
7248 if ((MAIN_NAME_P (declarator)
7249 || (IDENTIFIER_LENGTH (declarator) > 10
7250 && IDENTIFIER_POINTER (declarator)[0] == '_'
7251 && IDENTIFIER_POINTER (declarator)[1] == '_'
7252 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7253 && current_lang_name == lang_name_cplusplus
7254 && ctype == NULL_TREE
7255 && DECL_FILE_SCOPE_P (decl))
7256 SET_DECL_LANGUAGE (decl, lang_c);
7258 /* Should probably propagate const out from type to decl I bet (mrs). */
7261 DECL_STATIC_FUNCTION_P (decl) = 1;
7262 DECL_CONTEXT (decl) = ctype;
7267 DECL_CONTEXT (decl) = ctype;
7269 check_class_member_definition_namespace (decl);
7272 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7274 if (processing_template_decl)
7275 error ("cannot declare %<::main%> to be a template");
7277 error ("cannot declare %<::main%> to be inline");
7279 error ("cannot declare %<::main%> to be static");
7284 /* Members of anonymous types and local classes have no linkage; make
7285 them internal. If a typedef is made later, this will be changed. */
7286 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7287 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7290 if (publicp && cxx_dialect == cxx98)
7292 /* [basic.link]: A name with no linkage (notably, the name of a class
7293 or enumeration declared in a local scope) shall not be used to
7294 declare an entity with linkage.
7296 DR 757 relaxes this restriction for C++0x. */
7297 t = no_linkage_check (TREE_TYPE (decl),
7298 /*relaxed_p=*/false);
7301 if (TYPE_ANONYMOUS_P (t))
7303 if (DECL_EXTERN_C_P (decl))
7304 /* Allow this; it's pretty common in C. */;
7307 permerror (input_location, "anonymous type with no linkage "
7308 "used to declare function %q#D with linkage",
7310 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7311 permerror (input_location, "%q+#D does not refer to the unqualified "
7312 "type, so it is not used for linkage",
7317 permerror (input_location, "type %qT with no linkage used to "
7318 "declare function %q#D with linkage", t, decl);
7322 TREE_PUBLIC (decl) = publicp;
7325 DECL_INTERFACE_KNOWN (decl) = 1;
7326 DECL_NOT_REALLY_EXTERN (decl) = 1;
7329 /* If the declaration was declared inline, mark it as such. */
7331 DECL_DECLARED_INLINE_P (decl) = 1;
7333 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7335 DECL_EXTERNAL (decl) = 1;
7336 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7339 ? G_("static member function %qD cannot have cv-qualifier")
7340 : G_("non-member function %qD cannot have cv-qualifier"),
7342 quals = TYPE_UNQUALIFIED;
7345 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7346 && !grok_op_properties (decl, /*complain=*/true))
7350 /* Make the init_value nonzero so pushdecl knows this is not
7351 tentative. error_mark_node is replaced later with the BLOCK. */
7352 DECL_INITIAL (decl) = error_mark_node;
7354 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7355 TREE_NOTHROW (decl) = 1;
7357 /* Caller will do the rest of this. */
7361 if (ctype != NULL_TREE)
7362 grokclassfn (ctype, decl, flags);
7364 decl = check_explicit_specialization (orig_declarator, decl,
7367 4 * (friendp != 0));
7368 if (decl == error_mark_node)
7371 if (DECL_STATIC_FUNCTION_P (decl))
7372 check_static_quals (decl, quals);
7376 cplus_decl_attributes (&decl, *attrlist, 0);
7377 *attrlist = NULL_TREE;
7380 /* Check main's type after attributes have been applied. */
7381 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7383 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7386 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7388 error ("%<::main%> must return %<int%>");
7389 newtype = build_function_type (integer_type_node, oldtypeargs);
7390 TREE_TYPE (decl) = newtype;
7393 check_main_parameter_types (decl);
7396 if (ctype != NULL_TREE
7397 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7400 tree old_decl = check_classfn (ctype, decl,
7401 (processing_template_decl
7402 > template_class_depth (ctype))
7403 ? current_template_parms
7406 if (old_decl == error_mark_node)
7414 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7415 /* Because grokfndecl is always supposed to return a
7416 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7417 here. We depend on our callers to figure out that its
7418 really a template that's being returned. */
7419 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7421 if (DECL_STATIC_FUNCTION_P (old_decl)
7422 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7424 /* Remove the `this' parm added by grokclassfn. */
7425 revert_static_member_fn (decl);
7426 check_static_quals (decl, quals);
7428 if (DECL_ARTIFICIAL (old_decl))
7430 error ("definition of implicitly-declared %qD", old_decl);
7433 else if (DECL_DEFAULTED_FN (old_decl))
7435 error ("definition of explicitly-defaulted %q+D", decl);
7436 error ("%q+#D explicitly defaulted here", old_decl);
7440 /* Since we've smashed OLD_DECL to its
7441 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7442 if (TREE_CODE (decl) == TEMPLATE_DECL)
7443 decl = DECL_TEMPLATE_RESULT (decl);
7445 /* Attempt to merge the declarations. This can fail, in
7446 the case of some invalid specialization declarations. */
7447 pushed_scope = push_scope (ctype);
7448 ok = duplicate_decls (decl, old_decl, friendp);
7450 pop_scope (pushed_scope);
7453 error ("no %q#D member function declared in class %qT",
7461 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7464 if (ctype == NULL_TREE || check)
7468 DECL_VIRTUAL_P (decl) = 1;
7473 /* decl is a FUNCTION_DECL.
7474 specifiers are the parsed virt-specifiers.
7476 Set flags to reflect the virt-specifiers.
7481 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7483 if (decl == NULL_TREE)
7485 if (specifiers & VIRT_SPEC_OVERRIDE)
7486 DECL_OVERRIDE_P (decl) = 1;
7487 if (specifiers & VIRT_SPEC_FINAL)
7488 DECL_FINAL_P (decl) = 1;
7492 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7493 the linkage that DECL will receive in the object file. */
7496 set_linkage_for_static_data_member (tree decl)
7498 /* A static data member always has static storage duration and
7499 external linkage. Note that static data members are forbidden in
7500 local classes -- the only situation in which a class has
7501 non-external linkage. */
7502 TREE_PUBLIC (decl) = 1;
7503 TREE_STATIC (decl) = 1;
7504 /* For non-template classes, static data members are always put
7505 out in exactly those files where they are defined, just as
7506 with ordinary namespace-scope variables. */
7507 if (!processing_template_decl)
7508 DECL_INTERFACE_KNOWN (decl) = 1;
7511 /* Create a VAR_DECL named NAME with the indicated TYPE.
7513 If SCOPE is non-NULL, it is the class type or namespace containing
7514 the variable. If SCOPE is NULL, the variable should is created in
7515 the innermost enclosings scope. */
7518 grokvardecl (tree type,
7520 const cp_decl_specifier_seq *declspecs,
7526 tree explicit_scope;
7528 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7530 /* Compute the scope in which to place the variable, but remember
7531 whether or not that scope was explicitly specified by the user. */
7532 explicit_scope = scope;
7535 /* An explicit "extern" specifier indicates a namespace-scope
7537 if (declspecs->storage_class == sc_extern)
7538 scope = current_decl_namespace ();
7539 else if (!at_function_scope_p ())
7540 scope = current_scope ();
7544 && (/* If the variable is a namespace-scope variable declared in a
7545 template, we need DECL_LANG_SPECIFIC. */
7546 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7547 /* Similarly for namespace-scope variables with language linkage
7549 || (TREE_CODE (scope) == NAMESPACE_DECL
7550 && current_lang_name != lang_name_cplusplus)
7551 /* Similarly for static data members. */
7553 decl = build_lang_decl (VAR_DECL, name, type);
7555 decl = build_decl (input_location, VAR_DECL, name, type);
7557 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7558 set_decl_namespace (decl, explicit_scope, 0);
7560 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7562 if (declspecs->storage_class == sc_extern)
7564 DECL_THIS_EXTERN (decl) = 1;
7565 DECL_EXTERNAL (decl) = !initialized;
7568 if (DECL_CLASS_SCOPE_P (decl))
7570 set_linkage_for_static_data_member (decl);
7571 /* This function is only called with out-of-class definitions. */
7572 DECL_EXTERNAL (decl) = 0;
7573 check_class_member_definition_namespace (decl);
7575 /* At top level, either `static' or no s.c. makes a definition
7576 (perhaps tentative), and absence of `static' makes it public. */
7577 else if (toplevel_bindings_p ())
7579 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7580 && (DECL_THIS_EXTERN (decl) || ! constp));
7581 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7583 /* Not at top level, only `static' makes a static definition. */
7586 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7587 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7590 if (declspecs->specs[(int)ds_thread])
7591 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7593 /* If the type of the decl has no linkage, make sure that we'll
7594 notice that in mark_used. */
7595 if (cxx_dialect > cxx98
7596 && decl_linkage (decl) != lk_none
7597 && DECL_LANG_SPECIFIC (decl) == NULL
7598 && !DECL_EXTERN_C_P (decl)
7599 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7600 retrofit_lang_decl (decl);
7602 if (TREE_PUBLIC (decl))
7604 /* [basic.link]: A name with no linkage (notably, the name of a class
7605 or enumeration declared in a local scope) shall not be used to
7606 declare an entity with linkage.
7608 DR 757 relaxes this restriction for C++0x. */
7609 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7610 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7613 if (TYPE_ANONYMOUS_P (t))
7615 if (DECL_EXTERN_C_P (decl))
7616 /* Allow this; it's pretty common in C. */
7620 /* DRs 132, 319 and 389 seem to indicate types with
7621 no linkage can only be used to declare extern "C"
7622 entities. Since it's not always an error in the
7623 ISO C++ 90 Standard, we only issue a warning. */
7624 warning (0, "anonymous type with no linkage used to declare "
7625 "variable %q#D with linkage", decl);
7626 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7627 warning (0, "%q+#D does not refer to the unqualified "
7628 "type, so it is not used for linkage",
7633 warning (0, "type %qT with no linkage used to declare variable "
7634 "%q#D with linkage", t, decl);
7638 DECL_INTERFACE_KNOWN (decl) = 1;
7643 /* Create and return a canonical pointer to member function type, for
7644 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7647 build_ptrmemfunc_type (tree type)
7651 tree unqualified_variant = NULL_TREE;
7653 if (type == error_mark_node)
7656 /* If a canonical type already exists for this type, use it. We use
7657 this method instead of type_hash_canon, because it only does a
7658 simple equality check on the list of field members. */
7660 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7663 /* Make sure that we always have the unqualified pointer-to-member
7665 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7667 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7669 t = make_class_type (RECORD_TYPE);
7670 xref_basetypes (t, NULL_TREE);
7672 /* Let the front end know this is a pointer to member function... */
7673 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7674 /* ... and not really a class type. */
7675 SET_CLASS_TYPE_P (t, 0);
7677 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7680 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7682 DECL_CHAIN (field) = fields;
7685 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7687 /* Zap out the name so that the back end will give us the debugging
7688 information for this anonymous RECORD_TYPE. */
7689 TYPE_NAME (t) = NULL_TREE;
7691 /* If this is not the unqualified form of this pointer-to-member
7692 type, set the TYPE_MAIN_VARIANT for this type to be the
7693 unqualified type. Since they are actually RECORD_TYPEs that are
7694 not variants of each other, we must do this manually.
7695 As we just built a new type there is no need to do yet another copy. */
7696 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7698 int type_quals = cp_type_quals (type);
7699 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7700 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7701 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7702 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7703 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7704 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7705 TREE_TYPE (TYPE_BINFO (t)) = t;
7708 /* Cache this pointer-to-member type so that we can find it again
7710 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7712 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7713 SET_TYPE_STRUCTURAL_EQUALITY (t);
7714 else if (TYPE_CANONICAL (type) != type)
7715 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7720 /* Create and return a pointer to data member type. */
7723 build_ptrmem_type (tree class_type, tree member_type)
7725 if (TREE_CODE (member_type) == METHOD_TYPE)
7727 cp_cv_quals quals = type_memfn_quals (member_type);
7728 member_type = build_memfn_type (member_type, class_type, quals);
7729 return build_ptrmemfunc_type (build_pointer_type (member_type));
7733 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7734 return build_offset_type (class_type, member_type);
7738 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7739 Check to see that the definition is valid. Issue appropriate error
7740 messages. Return 1 if the definition is particularly bad, or 0
7744 check_static_variable_definition (tree decl, tree type)
7746 /* Can't check yet if we don't know the type. */
7747 if (dependent_type_p (type))
7749 /* If DECL is declared constexpr, we'll do the appropriate checks
7750 in check_initializer. */
7751 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7753 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7755 if (literal_type_p (type))
7756 permerror (input_location,
7757 "%<constexpr%> needed for in-class initialization of "
7758 "static data member %q#D of non-integral type", decl);
7760 error ("in-class initialization of static data member %q#D of "
7761 "non-literal type", decl);
7765 /* Motion 10 at San Diego: If a static const integral data member is
7766 initialized with an integral constant expression, the initializer
7767 may appear either in the declaration (within the class), or in
7768 the definition, but not both. If it appears in the class, the
7769 member is a member constant. The file-scope definition is always
7771 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7773 error ("invalid in-class initialization of static data member "
7774 "of non-integral type %qT",
7778 else if (!CP_TYPE_CONST_P (type))
7779 error ("ISO C++ forbids in-class initialization of non-const "
7780 "static member %qD",
7782 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7783 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7784 "%qD of non-integral type %qT", decl, type);
7789 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7790 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7791 expressions out into temporary variables so that walk_tree doesn't
7792 step into them (c++/15764). */
7795 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7797 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7798 tree expr = *expr_p;
7799 if (TREE_CODE (expr) == SAVE_EXPR)
7801 tree op = TREE_OPERAND (expr, 0);
7802 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7803 if (TREE_SIDE_EFFECTS (op))
7804 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7807 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7812 /* Entry point for the above. */
7815 stabilize_vla_size (tree size)
7817 struct pointer_set_t *pset = pointer_set_create ();
7818 /* Break out any function calls into temporary variables. */
7819 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7822 /* Given the SIZE (i.e., number of elements) in an array, compute an
7823 appropriate index type for the array. If non-NULL, NAME is the
7824 name of the thing being declared. */
7827 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7832 tree abi_1_itype = NULL_TREE;
7834 if (error_operand_p (size))
7835 return error_mark_node;
7837 type = TREE_TYPE (size);
7838 /* type_dependent_expression_p? */
7839 if (!dependent_type_p (type))
7841 mark_rvalue_use (size);
7843 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7844 && TREE_SIDE_EFFECTS (size))
7845 /* In C++98, we mark a non-constant array bound with a magic
7846 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7849 size = fold_non_dependent_expr (size);
7851 if (CLASS_TYPE_P (type)
7852 && CLASSTYPE_LITERAL_P (type))
7854 size = build_expr_type_conversion (WANT_INT, size, true);
7857 if (!(complain & tf_error))
7858 return error_mark_node;
7860 error ("size of array %qD has non-integral type %qT",
7863 error ("size of array has non-integral type %qT", type);
7864 size = integer_one_node;
7866 if (size == error_mark_node)
7867 return error_mark_node;
7868 type = TREE_TYPE (size);
7869 /* We didn't support this case in GCC 3.2, so don't bother
7870 trying to model it now in ABI v1. */
7871 abi_1_itype = error_mark_node;
7874 size = maybe_constant_value (size);
7875 if (!TREE_CONSTANT (size))
7879 if (error_operand_p (size))
7880 return error_mark_node;
7882 /* The array bound must be an integer type. */
7883 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7885 if (!(complain & tf_error))
7886 return error_mark_node;
7888 error ("size of array %qD has non-integral type %qT", name, type);
7890 error ("size of array has non-integral type %qT", type);
7891 size = integer_one_node;
7892 type = TREE_TYPE (size);
7896 /* A type is dependent if it is...an array type constructed from any
7897 dependent type or whose size is specified by a constant expression
7898 that is value-dependent. */
7899 /* We can only call value_dependent_expression_p on integral constant
7900 expressions; treat non-constant expressions as dependent, too. */
7901 if (processing_template_decl
7902 && (dependent_type_p (type)
7903 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7905 /* We cannot do any checking for a SIZE that isn't known to be
7906 constant. Just build the index type and mark that it requires
7907 structural equality checks. */
7908 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7909 size, integer_one_node));
7910 TYPE_DEPENDENT_P (itype) = 1;
7911 TYPE_DEPENDENT_P_VALID (itype) = 1;
7912 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7916 if (!abi_version_at_least (2) && processing_template_decl
7917 && abi_1_itype == NULL_TREE)
7918 /* For abi-1, we handled all instances in templates the same way,
7919 even when they were non-dependent. This affects the manglings
7920 produced. So, we do the normal checking for non-dependent
7921 sizes, but at the end we'll return the same type that abi-1
7922 would have, but with TYPE_CANONICAL set to the "right"
7923 value that the current ABI would provide. */
7924 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7925 osize, integer_one_node));
7927 /* Normally, the array-bound will be a constant. */
7928 if (TREE_CODE (size) == INTEGER_CST)
7930 /* Check to see if the array bound overflowed. Make that an
7931 error, no matter how generous we're being. */
7932 constant_expression_error (size);
7934 /* An array must have a positive number of elements. */
7935 if (INT_CST_LT (size, integer_zero_node))
7937 if (!(complain & tf_error))
7938 return error_mark_node;
7940 error ("size of array %qD is negative", name);
7942 error ("size of array is negative");
7943 size = integer_one_node;
7945 /* As an extension we allow zero-sized arrays. */
7946 else if (integer_zerop (size))
7948 if (!(complain & tf_error))
7949 /* We must fail if performing argument deduction (as
7950 indicated by the state of complain), so that
7951 another substitution can be found. */
7952 return error_mark_node;
7953 else if (in_system_header)
7954 /* Allow them in system headers because glibc uses them. */;
7956 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7958 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7961 else if (TREE_CONSTANT (size)
7962 /* We don't allow VLAs at non-function scopes, or during
7963 tentative template substitution. */
7964 || !at_function_scope_p () || !(complain & tf_error))
7966 if (!(complain & tf_error))
7967 return error_mark_node;
7968 /* `(int) &fn' is not a valid array bound. */
7970 error ("size of array %qD is not an integral constant-expression",
7973 error ("size of array is not an integral constant-expression");
7974 size = integer_one_node;
7976 else if (pedantic && warn_vla != 0)
7979 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7981 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7983 else if (warn_vla > 0)
7987 "variable length array %qD is used", name);
7990 "variable length array is used");
7993 if (processing_template_decl && !TREE_CONSTANT (size))
7994 /* A variable sized array. */
7995 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7998 HOST_WIDE_INT saved_processing_template_decl;
8000 /* Compute the index of the largest element in the array. It is
8001 one less than the number of elements in the array. We save
8002 and restore PROCESSING_TEMPLATE_DECL so that computations in
8003 cp_build_binary_op will be appropriately folded. */
8004 saved_processing_template_decl = processing_template_decl;
8005 processing_template_decl = 0;
8006 itype = cp_build_binary_op (input_location,
8008 cp_convert (ssizetype, size),
8009 cp_convert (ssizetype, integer_one_node),
8010 tf_warning_or_error);
8011 itype = fold (itype);
8012 processing_template_decl = saved_processing_template_decl;
8014 if (!TREE_CONSTANT (itype))
8015 /* A variable sized array. */
8016 itype = variable_size (itype);
8017 /* Make sure that there was no overflow when creating to a signed
8018 index type. (For example, on a 32-bit machine, an array with
8019 size 2^32 - 1 is too big.) */
8020 else if (TREE_CODE (itype) == INTEGER_CST
8021 && TREE_OVERFLOW (itype))
8023 if (!(complain & tf_error))
8024 return error_mark_node;
8025 error ("overflow in array dimension");
8026 TREE_OVERFLOW (itype) = 0;
8030 /* Create and return the appropriate index type. */
8031 if (abi_1_itype && abi_1_itype != error_mark_node)
8033 tree t = build_index_type (itype);
8034 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8035 itype = abi_1_itype;
8038 itype = build_index_type (itype);
8040 /* If the index type were dependent, we would have returned early, so
8041 remember that it isn't. */
8042 TYPE_DEPENDENT_P (itype) = 0;
8043 TYPE_DEPENDENT_P_VALID (itype) = 1;
8047 /* Returns the scope (if any) in which the entity declared by
8048 DECLARATOR will be located. If the entity was declared with an
8049 unqualified name, NULL_TREE is returned. */
8052 get_scope_of_declarator (const cp_declarator *declarator)
8054 while (declarator && declarator->kind != cdk_id)
8055 declarator = declarator->declarator;
8057 /* If the declarator-id is a SCOPE_REF, the scope in which the
8058 declaration occurs is the first operand. */
8060 && declarator->u.id.qualifying_scope)
8061 return declarator->u.id.qualifying_scope;
8063 /* Otherwise, the declarator is not a qualified name; the entity will
8064 be declared in the current scope. */
8068 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8069 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8073 create_array_type_for_decl (tree name, tree type, tree size)
8075 tree itype = NULL_TREE;
8077 /* If things have already gone awry, bail now. */
8078 if (type == error_mark_node || size == error_mark_node)
8079 return error_mark_node;
8081 /* 8.3.4/1: If the type of the identifier of D contains the auto
8082 type-specifier, the program is ill-formed. */
8083 if (pedantic && type_uses_auto (type))
8084 pedwarn (input_location, OPT_pedantic,
8085 "declaration of %qD as array of %<auto%>", name);
8087 /* If there are some types which cannot be array elements,
8088 issue an error-message and return. */
8089 switch (TREE_CODE (type))
8093 error ("declaration of %qD as array of void", name);
8095 error ("creating array of void");
8096 return error_mark_node;
8100 error ("declaration of %qD as array of functions", name);
8102 error ("creating array of functions");
8103 return error_mark_node;
8105 case REFERENCE_TYPE:
8107 error ("declaration of %qD as array of references", name);
8109 error ("creating array of references");
8110 return error_mark_node;
8114 error ("declaration of %qD as array of function members", name);
8116 error ("creating array of function members");
8117 return error_mark_node;
8125 The constant expressions that specify the bounds of the arrays
8126 can be omitted only for the first member of the sequence. */
8127 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8130 error ("declaration of %qD as multidimensional array must "
8131 "have bounds for all dimensions except the first",
8134 error ("multidimensional array must have bounds for all "
8135 "dimensions except the first");
8137 return error_mark_node;
8140 /* Figure out the index type for the array. */
8142 itype = compute_array_index_type (name, size, tf_warning_or_error);
8145 T is called the array element type; this type shall not be [...] an
8146 abstract class type. */
8147 abstract_virtuals_error (name, type);
8149 return build_cplus_array_type (type, itype);
8152 /* Check that it's OK to declare a function with the indicated TYPE.
8153 SFK indicates the kind of special function (if any) that this
8154 function is. OPTYPE is the type given in a conversion operator
8155 declaration, or the class type for a constructor/destructor.
8156 Returns the actual return type of the function; that
8157 may be different than TYPE if an error occurs, or for certain
8158 special functions. */
8161 check_special_function_return_type (special_function_kind sfk,
8167 case sfk_constructor:
8169 error ("return type specification for constructor invalid");
8171 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8172 type = build_pointer_type (optype);
8174 type = void_type_node;
8177 case sfk_destructor:
8179 error ("return type specification for destructor invalid");
8180 /* We can't use the proper return type here because we run into
8181 problems with ambiguous bases and covariant returns.
8182 Java classes are left unchanged because (void *) isn't a valid
8183 Java type, and we don't want to change the Java ABI. */
8184 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8185 type = build_pointer_type (void_type_node);
8187 type = void_type_node;
8190 case sfk_conversion:
8192 error ("return type specified for %<operator %T%>", optype);
8203 /* A variable or data member (whose unqualified name is IDENTIFIER)
8204 has been declared with the indicated TYPE. If the TYPE is not
8205 acceptable, issue an error message and return a type to use for
8206 error-recovery purposes. */
8209 check_var_type (tree identifier, tree type)
8211 if (VOID_TYPE_P (type))
8214 error ("unnamed variable or field declared void");
8215 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8217 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8218 error ("variable or field %qE declared void", identifier);
8221 error ("variable or field declared void");
8222 type = error_mark_node;
8228 /* Given declspecs and a declarator (abstract or otherwise), determine
8229 the name and type of the object declared and construct a DECL node
8232 DECLSPECS points to the representation of declaration-specifier
8233 sequence that precedes declarator.
8235 DECL_CONTEXT says which syntactic context this declaration is in:
8236 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8237 FUNCDEF for a function definition. Like NORMAL but a few different
8238 error messages in each case. Return value may be zero meaning
8239 this definition is too screwy to try to parse.
8240 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8241 handle member functions (which have FIELD context).
8242 Return value may be zero meaning this definition is too screwy to
8244 PARM for a parameter declaration (either within a function prototype
8245 or before a function body). Make a PARM_DECL, or return void_type_node.
8246 TPARM for a template parameter declaration.
8247 CATCHPARM for a parameter declaration before a catch clause.
8248 TYPENAME if for a typename (in a cast or sizeof).
8249 Don't make a DECL node; just return the ..._TYPE node.
8250 FIELD for a struct or union field; make a FIELD_DECL.
8251 BITFIELD for a field with specified width.
8253 INITIALIZED is as for start_decl.
8255 ATTRLIST is a pointer to the list of attributes, which may be NULL
8256 if there are none; *ATTRLIST may be modified if attributes from inside
8257 the declarator should be applied to the declaration.
8259 When this function is called, scoping variables (such as
8260 CURRENT_CLASS_TYPE) should reflect the scope in which the
8261 declaration occurs, not the scope in which the new declaration will
8262 be placed. For example, on:
8266 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8269 Returns a DECL (if a declarator is present), a TYPE (if there is no
8270 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8274 grokdeclarator (const cp_declarator *declarator,
8275 const cp_decl_specifier_seq *declspecs,
8276 enum decl_context decl_context,
8280 tree type = NULL_TREE;
8282 int explicit_int128 = 0;
8283 int virtualp, explicitp, friendp, inlinep, staticp;
8284 int explicit_int = 0;
8285 int explicit_char = 0;
8286 int defaulted_int = 0;
8287 tree dependent_name = NULL_TREE;
8289 tree typedef_decl = NULL_TREE;
8290 const char *name = NULL;
8291 tree typedef_type = NULL_TREE;
8292 /* True if this declarator is a function definition. */
8293 bool funcdef_flag = false;
8294 cp_declarator_kind innermost_code = cdk_error;
8297 /* See the code below that used this. */
8298 tree decl_attr = NULL_TREE;
8301 /* Keep track of what sort of function is being processed
8302 so that we can warn about default return values, or explicit
8303 return values which do not match prescribed defaults. */
8304 special_function_kind sfk = sfk_none;
8306 tree dname = NULL_TREE;
8307 tree ctor_return_type = NULL_TREE;
8308 enum overload_flags flags = NO_SPECIAL;
8309 /* cv-qualifiers that apply to the declarator, for a declaration of
8310 a member function. */
8311 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8312 /* virt-specifiers that apply to the declarator, for a declaration of
8313 a member function. */
8314 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8315 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8317 tree raises = NULL_TREE;
8318 int template_count = 0;
8319 tree returned_attrs = NULL_TREE;
8320 tree parms = NULL_TREE;
8321 const cp_declarator *id_declarator;
8322 /* The unqualified name of the declarator; either an
8323 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8324 tree unqualified_id;
8325 /* The class type, if any, in which this entity is located,
8326 or NULL_TREE if none. Note that this value may be different from
8327 the current class type; for example if an attempt is made to declare
8328 "A::f" inside "B", this value will be "A". */
8329 tree ctype = current_class_type;
8330 /* The NAMESPACE_DECL for the namespace in which this entity is
8331 located. If an unqualified name is used to declare the entity,
8332 this value will be NULL_TREE, even if the entity is located at
8334 tree in_namespace = NULL_TREE;
8335 cp_storage_class storage_class;
8336 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8337 bool type_was_error_mark_node = false;
8338 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8339 bool template_type_arg = false;
8340 bool template_parm_flag = false;
8341 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8344 signed_p = declspecs->specs[(int)ds_signed];
8345 unsigned_p = declspecs->specs[(int)ds_unsigned];
8346 short_p = declspecs->specs[(int)ds_short];
8347 long_p = declspecs->specs[(int)ds_long];
8348 longlong = declspecs->specs[(int)ds_long] >= 2;
8349 explicit_int128 = declspecs->explicit_int128_p;
8350 thread_p = declspecs->specs[(int)ds_thread];
8352 if (decl_context == FUNCDEF)
8353 funcdef_flag = true, decl_context = NORMAL;
8354 else if (decl_context == MEMFUNCDEF)
8355 funcdef_flag = true, decl_context = FIELD;
8356 else if (decl_context == BITFIELD)
8357 bitfield = 1, decl_context = FIELD;
8358 else if (decl_context == TEMPLATE_TYPE_ARG)
8359 template_type_arg = true, decl_context = TYPENAME;
8360 else if (decl_context == TPARM)
8361 template_parm_flag = true, decl_context = PARM;
8363 if (initialized > 1)
8364 funcdef_flag = true;
8366 /* Look inside a declarator for the name being declared
8367 and get it as a string, for an error message. */
8368 for (id_declarator = declarator;
8370 id_declarator = id_declarator->declarator)
8372 if (id_declarator->kind != cdk_id)
8373 innermost_code = id_declarator->kind;
8375 switch (id_declarator->kind)
8378 if (id_declarator->declarator
8379 && id_declarator->declarator->kind == cdk_id)
8381 sfk = id_declarator->declarator->u.id.sfk;
8382 if (sfk == sfk_destructor)
8389 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8390 tree decl = id_declarator->u.id.unqualified_name;
8393 if (qualifying_scope)
8395 if (at_function_scope_p ())
8399 A declarator-id shall not be qualified except
8402 None of the cases are permitted in block
8404 if (qualifying_scope == global_namespace)
8405 error ("invalid use of qualified-name %<::%D%>",
8407 else if (TYPE_P (qualifying_scope))
8408 error ("invalid use of qualified-name %<%T::%D%>",
8409 qualifying_scope, decl);
8411 error ("invalid use of qualified-name %<%D::%D%>",
8412 qualifying_scope, decl);
8413 return error_mark_node;
8415 else if (TYPE_P (qualifying_scope))
8417 ctype = qualifying_scope;
8418 if (!MAYBE_CLASS_TYPE_P (ctype))
8420 error ("%q#T is not a class or a namespace", ctype);
8423 else if (innermost_code != cdk_function
8424 && current_class_type
8425 && !UNIQUELY_DERIVED_FROM_P (ctype,
8426 current_class_type))
8428 error ("type %qT is not derived from type %qT",
8429 ctype, current_class_type);
8430 return error_mark_node;
8433 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8434 in_namespace = qualifying_scope;
8436 switch (TREE_CODE (decl))
8442 if (innermost_code != cdk_function)
8444 error ("declaration of %qD as non-function", decl);
8445 return error_mark_node;
8447 else if (!qualifying_scope
8448 && !(current_class_type && at_class_scope_p ()))
8450 error ("declaration of %qD as non-member", decl);
8451 return error_mark_node;
8454 type = TREE_OPERAND (decl, 0);
8456 type = constructor_name (type);
8457 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8462 case TEMPLATE_ID_EXPR:
8464 tree fns = TREE_OPERAND (decl, 0);
8467 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8469 gcc_assert (is_overloaded_fn (dname));
8470 dname = DECL_NAME (get_first_fn (dname));
8475 case IDENTIFIER_NODE:
8476 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8479 if (C_IS_RESERVED_WORD (dname))
8481 error ("declarator-id missing; using reserved word %qD",
8483 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8485 else if (!IDENTIFIER_TYPENAME_P (dname))
8486 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8489 gcc_assert (flags == NO_SPECIAL);
8490 flags = TYPENAME_FLAG;
8491 ctor_return_type = TREE_TYPE (dname);
8492 sfk = sfk_conversion;
8493 if (is_typename_at_global_scope (dname))
8494 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8496 name = "<invalid operator>";
8513 return error_mark_node;
8518 if (id_declarator->kind == cdk_id)
8524 The declarator in a function-definition shall have the form
8525 D1 ( parameter-declaration-clause) ... */
8526 if (funcdef_flag && innermost_code != cdk_function)
8528 error ("function definition does not declare parameters");
8529 return error_mark_node;
8532 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8533 && innermost_code != cdk_function
8534 && ! (ctype && !declspecs->any_specifiers_p))
8536 error ("declaration of %qD as non-function", dname);
8537 return error_mark_node;
8540 if (dname && IDENTIFIER_OPNAME_P (dname))
8542 if (declspecs->specs[(int)ds_typedef])
8544 error ("declaration of %qD as %<typedef%>", dname);
8545 return error_mark_node;
8547 else if (decl_context == PARM || decl_context == CATCHPARM)
8549 error ("declaration of %qD as parameter", dname);
8550 return error_mark_node;
8554 /* Anything declared one level down from the top level
8555 must be one of the parameters of a function
8556 (because the body is at least two levels down). */
8558 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8559 by not allowing C++ class definitions to specify their parameters
8560 with xdecls (must be spec.d in the parmlist).
8562 Since we now wait to push a class scope until we are sure that
8563 we are in a legitimate method context, we must set oldcname
8564 explicitly (since current_class_name is not yet alive).
8566 We also want to avoid calling this a PARM if it is in a namespace. */
8568 if (decl_context == NORMAL && !toplevel_bindings_p ())
8570 cp_binding_level *b = current_binding_level;
8571 current_binding_level = b->level_chain;
8572 if (current_binding_level != 0 && toplevel_bindings_p ())
8573 decl_context = PARM;
8574 current_binding_level = b;
8578 name = decl_context == PARM ? "parameter" : "type name";
8580 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8582 error ("%<constexpr%> cannot appear in a typedef declaration");
8583 return error_mark_node;
8586 /* If there were multiple types specified in the decl-specifier-seq,
8587 issue an error message. */
8588 if (declspecs->multiple_types_p)
8590 error ("two or more data types in declaration of %qs", name);
8591 return error_mark_node;
8594 if (declspecs->conflicting_specifiers_p)
8596 error ("conflicting specifiers in declaration of %qs", name);
8597 return error_mark_node;
8600 /* Extract the basic type from the decl-specifier-seq. */
8601 type = declspecs->type;
8602 if (type == error_mark_node)
8605 type_was_error_mark_node = true;
8607 /* If the entire declaration is itself tagged as deprecated then
8608 suppress reports of deprecated items. */
8609 if (type && TREE_DEPRECATED (type)
8610 && deprecated_state != DEPRECATED_SUPPRESS)
8611 warn_deprecated_use (type, NULL_TREE);
8612 if (type && TREE_CODE (type) == TYPE_DECL)
8614 typedef_decl = type;
8615 type = TREE_TYPE (typedef_decl);
8616 if (TREE_DEPRECATED (type)
8617 && DECL_ARTIFICIAL (typedef_decl)
8618 && deprecated_state != DEPRECATED_SUPPRESS)
8619 warn_deprecated_use (type, NULL_TREE);
8621 /* No type at all: default to `int', and set DEFAULTED_INT
8622 because it was not a user-defined typedef. */
8623 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8625 /* These imply 'int'. */
8626 type = integer_type_node;
8630 explicit_int = declspecs->explicit_int_p;
8631 explicit_char = declspecs->explicit_char_p;
8634 /* See the code below that used this. */
8636 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8638 typedef_type = type;
8641 if (sfk != sfk_conversion)
8642 ctor_return_type = ctype;
8644 if (sfk != sfk_none)
8645 type = check_special_function_return_type (sfk, type,
8647 else if (type == NULL_TREE)
8653 /* We handle `main' specially here, because 'main () { }' is so
8654 common. With no options, it is allowed. With -Wreturn-type,
8655 it is a warning. It is only an error with -pedantic-errors. */
8656 is_main = (funcdef_flag
8657 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8658 && MAIN_NAME_P (dname)
8659 && ctype == NULL_TREE
8660 && in_namespace == NULL_TREE
8661 && current_namespace == global_namespace);
8663 if (type_was_error_mark_node)
8664 /* We've already issued an error, don't complain more. */;
8665 else if (in_system_header || flag_ms_extensions)
8666 /* Allow it, sigh. */;
8668 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8670 pedwarn (input_location, OPT_pedantic,
8671 "ISO C++ forbids declaration of %qs with no type", name);
8673 warning (OPT_Wreturn_type,
8674 "ISO C++ forbids declaration of %qs with no type", name);
8676 type = integer_type_node;
8681 if (explicit_int128)
8683 if (int128_integer_type_node == NULL_TREE)
8685 error ("%<__int128%> is not supported by this target");
8686 explicit_int128 = false;
8688 else if (pedantic && ! in_system_header)
8689 pedwarn (input_location, OPT_pedantic,
8690 "ISO C++ does not support %<__int128%> for %qs", name);
8693 /* Now process the modifiers that were specified
8694 and check for invalid combinations. */
8696 /* Long double is a special combination. */
8697 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8700 type = cp_build_qualified_type (long_double_type_node,
8701 cp_type_quals (type));
8704 /* Check all other uses of type modifiers. */
8706 if (unsigned_p || signed_p || long_p || short_p)
8710 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8711 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8712 else if (signed_p && unsigned_p)
8713 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8714 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8715 error ("%<long long%> invalid for %qs", name);
8716 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8717 error ("%<long%> invalid for %qs", name);
8718 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8719 error ("%<short%> invalid for %qs", name);
8720 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8721 error ("%<long%> or %<short%> invalid for %qs", name);
8722 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8723 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8724 else if ((long_p || short_p) && explicit_char)
8725 error ("%<long%> or %<short%> specified with char for %qs", name);
8726 else if (long_p && short_p)
8727 error ("%<long%> and %<short%> specified together for %qs", name);
8728 else if (type == char16_type_node || type == char32_type_node)
8730 if (signed_p || unsigned_p)
8731 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8732 else if (short_p || long_p)
8733 error ("%<short%> or %<long%> invalid for %qs", name);
8738 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8740 pedwarn (input_location, OPT_pedantic,
8741 "long, short, signed or unsigned used invalidly for %qs",
8743 if (flag_pedantic_errors)
8748 /* Discard the type modifiers if they are invalid. */
8759 /* Decide whether an integer type is signed or not.
8760 Optionally treat bitfields as signed by default. */
8764 It is implementation-defined whether a plain (neither
8765 explicitly signed or unsigned) char, short, int, or long
8766 bit-field is signed or unsigned.
8768 Naturally, we extend this to long long as well. Note that
8769 this does not include wchar_t. */
8770 || (bitfield && !flag_signed_bitfields
8772 /* A typedef for plain `int' without `signed' can be
8773 controlled just like plain `int', but a typedef for
8774 `signed int' cannot be so controlled. */
8776 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8777 && TREE_CODE (type) == INTEGER_TYPE
8778 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8780 if (explicit_int128)
8781 type = int128_unsigned_type_node;
8783 type = long_long_unsigned_type_node;
8785 type = long_unsigned_type_node;
8787 type = short_unsigned_type_node;
8788 else if (type == char_type_node)
8789 type = unsigned_char_type_node;
8790 else if (typedef_decl)
8791 type = unsigned_type_for (type);
8793 type = unsigned_type_node;
8795 else if (signed_p && type == char_type_node)
8796 type = signed_char_type_node;
8797 else if (explicit_int128)
8798 type = int128_integer_type_node;
8800 type = long_long_integer_type_node;
8802 type = long_integer_type_node;
8804 type = short_integer_type_node;
8806 if (declspecs->specs[(int)ds_complex])
8808 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8809 error ("complex invalid for %qs", name);
8810 /* If we just have "complex", it is equivalent to
8811 "complex double", but if any modifiers at all are specified it is
8812 the complex form of TYPE. E.g, "complex short" is
8813 "complex short int". */
8814 else if (defaulted_int && ! longlong && ! explicit_int128
8815 && ! (long_p || short_p || signed_p || unsigned_p))
8816 type = complex_double_type_node;
8817 else if (type == integer_type_node)
8818 type = complex_integer_type_node;
8819 else if (type == float_type_node)
8820 type = complex_float_type_node;
8821 else if (type == double_type_node)
8822 type = complex_double_type_node;
8823 else if (type == long_double_type_node)
8824 type = complex_long_double_type_node;
8826 type = build_complex_type (type);
8829 type_quals = TYPE_UNQUALIFIED;
8830 if (declspecs->specs[(int)ds_const])
8831 type_quals |= TYPE_QUAL_CONST;
8832 if (declspecs->specs[(int)ds_volatile])
8833 type_quals |= TYPE_QUAL_VOLATILE;
8834 if (declspecs->specs[(int)ds_restrict])
8835 type_quals |= TYPE_QUAL_RESTRICT;
8836 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8837 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8840 type_quals |= cp_type_quals (type);
8841 type = cp_build_qualified_type_real
8842 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8843 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8844 /* We might have ignored or rejected some of the qualifiers. */
8845 type_quals = cp_type_quals (type);
8848 inlinep = !! declspecs->specs[(int)ds_inline];
8849 virtualp = !! declspecs->specs[(int)ds_virtual];
8850 explicitp = !! declspecs->specs[(int)ds_explicit];
8852 storage_class = declspecs->storage_class;
8853 if (storage_class == sc_static)
8854 staticp = 1 + (decl_context == FIELD);
8856 if (virtualp && staticp == 2)
8858 error ("member %qD cannot be declared both virtual and static", dname);
8859 storage_class = sc_none;
8862 friendp = !! declspecs->specs[(int)ds_friend];
8864 if (dependent_name && !friendp)
8866 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8867 return error_mark_node;
8870 /* Issue errors about use of storage classes for parameters. */
8871 if (decl_context == PARM)
8873 if (declspecs->specs[(int)ds_typedef])
8875 error ("typedef declaration invalid in parameter declaration");
8876 return error_mark_node;
8878 else if (template_parm_flag && storage_class != sc_none)
8880 error ("storage class specified for template parameter %qs", name);
8881 return error_mark_node;
8883 else if (storage_class == sc_static
8884 || storage_class == sc_extern
8886 error ("storage class specifiers invalid in parameter declarations");
8888 /* Function parameters cannot be constexpr. If we saw one, moan
8889 and pretend it wasn't there. */
8892 error ("a parameter cannot be declared %<constexpr%>");
8897 /* Give error if `virtual' is used outside of class declaration. */
8899 && (current_class_name == NULL_TREE || decl_context != FIELD))
8901 error ("%<virtual%> outside class declaration");
8905 /* Static anonymous unions are dealt with here. */
8906 if (staticp && decl_context == TYPENAME
8908 && ANON_AGGR_TYPE_P (declspecs->type))
8909 decl_context = FIELD;
8911 /* Warn about storage classes that are invalid for certain
8912 kinds of declarations (parameters, typenames, etc.). */
8915 && storage_class != sc_extern
8916 && storage_class != sc_static)
8917 || declspecs->specs[(int)ds_typedef]))
8919 error ("multiple storage classes in declaration of %qs", name);
8922 if (decl_context != NORMAL
8923 && ((storage_class != sc_none
8924 && storage_class != sc_mutable)
8927 if ((decl_context == PARM || decl_context == CATCHPARM)
8928 && (storage_class == sc_register
8929 || storage_class == sc_auto))
8931 else if (declspecs->specs[(int)ds_typedef])
8933 else if (decl_context == FIELD
8934 /* C++ allows static class elements. */
8935 && storage_class == sc_static)
8936 /* C++ also allows inlines and signed and unsigned elements,
8937 but in those cases we don't come in here. */
8941 if (decl_context == FIELD)
8942 error ("storage class specified for %qs", name);
8945 if (decl_context == PARM || decl_context == CATCHPARM)
8946 error ("storage class specified for parameter %qs", name);
8948 error ("storage class specified for typename");
8950 if (storage_class == sc_register
8951 || storage_class == sc_auto
8952 || storage_class == sc_extern
8954 storage_class = sc_none;
8957 else if (storage_class == sc_extern && funcdef_flag
8958 && ! toplevel_bindings_p ())
8959 error ("nested function %qs declared %<extern%>", name);
8960 else if (toplevel_bindings_p ())
8962 if (storage_class == sc_auto)
8963 error ("top-level declaration of %qs specifies %<auto%>", name);
8966 && storage_class != sc_extern
8967 && storage_class != sc_static)
8969 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8974 if (storage_class && friendp)
8976 error ("storage class specifiers invalid in friend function declarations");
8977 storage_class = sc_none;
8982 unqualified_id = NULL_TREE;
8985 unqualified_id = id_declarator->u.id.unqualified_name;
8986 switch (TREE_CODE (unqualified_id))
8989 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8990 if (TYPE_P (unqualified_id))
8991 unqualified_id = constructor_name (unqualified_id);
8994 case IDENTIFIER_NODE:
8995 case TEMPLATE_ID_EXPR:
9003 /* Determine the type of the entity declared by recurring on the
9005 for (; declarator; declarator = declarator->declarator)
9007 const cp_declarator *inner_declarator;
9010 if (type == error_mark_node)
9011 return error_mark_node;
9013 attrs = declarator->attributes;
9019 if (declarator == NULL || declarator->kind == cdk_id)
9020 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9021 if (declarator->kind == cdk_function)
9022 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9023 if (declarator->kind == cdk_array)
9024 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9025 returned_attrs = decl_attributes (&type,
9026 chainon (returned_attrs, attrs),
9030 if (declarator->kind == cdk_id)
9033 inner_declarator = declarator->declarator;
9035 switch (declarator->kind)
9038 type = create_array_type_for_decl (dname, type,
9039 declarator->u.array.bounds);
9047 /* Declaring a function type.
9048 Make sure we have a valid type for the function to return. */
9050 if (type_quals != TYPE_UNQUALIFIED)
9052 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9053 warning (OPT_Wignored_qualifiers,
9054 "type qualifiers ignored on function return type");
9055 /* We now know that the TYPE_QUALS don't apply to the
9056 decl, but to its return type. */
9057 type_quals = TYPE_UNQUALIFIED;
9059 errmsg = targetm.invalid_return_type (type);
9063 type = integer_type_node;
9066 /* Error about some types functions can't return. */
9068 if (TREE_CODE (type) == FUNCTION_TYPE)
9070 error ("%qs declared as function returning a function", name);
9071 return error_mark_node;
9073 if (TREE_CODE (type) == ARRAY_TYPE)
9075 error ("%qs declared as function returning an array", name);
9076 return error_mark_node;
9079 /* Pick up type qualifiers which should be applied to `this'. */
9080 memfn_quals = declarator->u.function.qualifiers;
9081 /* Pick up virt-specifiers. */
9082 virt_specifiers = declarator->u.function.virt_specifiers;
9083 /* Pick up the exception specifications. */
9084 raises = declarator->u.function.exception_specification;
9085 /* If the exception-specification is ill-formed, let's pretend
9086 there wasn't one. */
9087 if (raises == error_mark_node)
9090 /* Say it's a definition only for the CALL_EXPR
9091 closest to the identifier. */
9092 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9094 /* Handle a late-specified return type. */
9097 if (type_uses_auto (type))
9099 if (!declarator->u.function.late_return_type)
9101 error ("%qs function uses %<auto%> type specifier without"
9102 " late return type", name);
9103 return error_mark_node;
9105 else if (!is_auto (type))
9107 error ("%qs function with late return type has"
9108 " %qT as its type rather than plain %<auto%>",
9110 return error_mark_node;
9113 else if (declarator->u.function.late_return_type)
9115 error ("%qs function with late return type not declared"
9116 " with %<auto%> type specifier", name);
9117 return error_mark_node;
9120 type = splice_late_return_type
9121 (type, declarator->u.function.late_return_type);
9122 if (type == error_mark_node)
9123 return error_mark_node;
9125 if (ctype == NULL_TREE
9126 && decl_context == FIELD
9128 && (friendp == 0 || dname == current_class_name))
9129 ctype = current_class_type;
9131 if (ctype && (sfk == sfk_constructor
9132 || sfk == sfk_destructor))
9134 /* We are within a class's scope. If our declarator name
9135 is the same as the class name, and we are defining
9136 a function, then it is a constructor/destructor, and
9137 therefore returns a void type. */
9139 /* ISO C++ 12.4/2. A destructor may not be declared
9140 const or volatile. A destructor may not be
9143 ISO C++ 12.1. A constructor may not be declared
9144 const or volatile. A constructor may not be
9145 virtual. A constructor may not be static. */
9147 error ((flags == DTOR_FLAG)
9148 ? G_("destructor cannot be static member function")
9149 : G_("constructor cannot be static member function"));
9152 error ((flags == DTOR_FLAG)
9153 ? G_("destructors may not be cv-qualified")
9154 : G_("constructors may not be cv-qualified"));
9155 memfn_quals = TYPE_UNQUALIFIED;
9158 if (decl_context == FIELD
9159 && !member_function_or_else (ctype,
9162 return error_mark_node;
9164 if (flags != DTOR_FLAG)
9166 /* It's a constructor. */
9171 permerror (input_location, "constructors cannot be declared virtual");
9174 if (decl_context == FIELD
9175 && sfk != sfk_constructor)
9176 return error_mark_node;
9178 if (decl_context == FIELD)
9184 error ("can%'t initialize friend function %qs", name);
9187 /* Cannot be both friend and virtual. */
9188 error ("virtual functions cannot be friends");
9191 if (decl_context == NORMAL)
9192 error ("friend declaration not in class definition");
9193 if (current_function_decl && funcdef_flag)
9194 error ("can%'t define friend function %qs in a local "
9198 else if (ctype && sfk == sfk_conversion)
9202 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9207 arg_types = grokparms (declarator->u.function.parameters,
9210 if (inner_declarator
9211 && inner_declarator->kind == cdk_id
9212 && inner_declarator->u.id.sfk == sfk_destructor
9213 && arg_types != void_list_node)
9215 error ("destructors may not have parameters");
9216 arg_types = void_list_node;
9220 type = build_function_type (type, arg_types);
9227 /* Filter out pointers-to-references and references-to-references.
9228 We can get these if a TYPE_DECL is used. */
9230 if (TREE_CODE (type) == REFERENCE_TYPE)
9232 if (declarator->kind != cdk_reference)
9234 error ("cannot declare pointer to %q#T", type);
9235 type = TREE_TYPE (type);
9238 /* In C++0x, we allow reference to reference declarations
9239 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9240 and template type arguments [14.3.1/4 temp.arg.type]. The
9241 check for direct reference to reference declarations, which
9242 are still forbidden, occurs below. Reasoning behind the change
9243 can be found in DR106, DR540, and the rvalue reference
9245 else if (cxx_dialect == cxx98)
9247 error ("cannot declare reference to %q#T", type);
9248 type = TREE_TYPE (type);
9251 else if (VOID_TYPE_P (type))
9253 if (declarator->kind == cdk_reference)
9254 error ("cannot declare reference to %q#T", type);
9255 else if (declarator->kind == cdk_ptrmem)
9256 error ("cannot declare pointer to %q#T member", type);
9259 /* We now know that the TYPE_QUALS don't apply to the decl,
9260 but to the target of the pointer. */
9261 type_quals = TYPE_UNQUALIFIED;
9263 if (declarator->kind == cdk_ptrmem
9264 && (TREE_CODE (type) == FUNCTION_TYPE
9265 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9267 memfn_quals |= type_memfn_quals (type);
9268 type = build_memfn_type (type,
9269 declarator->u.pointer.class_type,
9271 if (type == error_mark_node)
9272 return error_mark_node;
9273 memfn_quals = TYPE_UNQUALIFIED;
9276 if (TREE_CODE (type) == FUNCTION_TYPE
9277 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9278 error (declarator->kind == cdk_reference
9279 ? G_("cannot declare reference to qualified function type %qT")
9280 : G_("cannot declare pointer to qualified function type %qT"),
9283 /* When the pointed-to type involves components of variable size,
9284 care must be taken to ensure that the size evaluation code is
9285 emitted early enough to dominate all the possible later uses
9286 and late enough for the variables on which it depends to have
9289 This is expected to happen automatically when the pointed-to
9290 type has a name/declaration of it's own, but special attention
9291 is required if the type is anonymous.
9293 We handle the NORMAL and FIELD contexts here by inserting a
9294 dummy statement that just evaluates the size at a safe point
9295 and ensures it is not deferred until e.g. within a deeper
9296 conditional context (c++/43555).
9298 We expect nothing to be needed here for PARM or TYPENAME.
9299 Evaluating the size at this point for TYPENAME would
9300 actually be incorrect, as we might be in the middle of an
9301 expression with side effects on the pointed-to type size
9302 "arguments" prior to the pointer declaration point and the
9303 size evaluation could end up prior to the side effects. */
9305 if (!TYPE_NAME (type)
9306 && (decl_context == NORMAL || decl_context == FIELD)
9307 && at_function_scope_p ()
9308 && variably_modified_type_p (type, NULL_TREE))
9310 /* First break out any side-effects. */
9311 stabilize_vla_size (TYPE_SIZE (type));
9312 /* And then force evaluation of the SAVE_EXPR. */
9313 finish_expr_stmt (TYPE_SIZE (type));
9316 if (declarator->kind == cdk_reference)
9318 /* In C++0x, the type we are creating a reference to might be
9319 a typedef which is itself a reference type. In that case,
9320 we follow the reference collapsing rules in
9321 [7.1.3/8 dcl.typedef] to create the final reference type:
9323 "If a typedef TD names a type that is a reference to a type
9324 T, an attempt to create the type 'lvalue reference to cv TD'
9325 creates the type 'lvalue reference to T,' while an attempt
9326 to create the type "rvalue reference to cv TD' creates the
9329 if (VOID_TYPE_P (type))
9330 /* We already gave an error. */;
9331 else if (TREE_CODE (type) == REFERENCE_TYPE)
9333 if (declarator->u.reference.rvalue_ref)
9334 /* Leave type alone. */;
9336 type = cp_build_reference_type (TREE_TYPE (type), false);
9339 type = cp_build_reference_type
9340 (type, declarator->u.reference.rvalue_ref);
9342 /* In C++0x, we need this check for direct reference to
9343 reference declarations, which are forbidden by
9344 [8.3.2/5 dcl.ref]. Reference to reference declarations
9345 are only allowed indirectly through typedefs and template
9346 type arguments. Example:
9348 void foo(int & &); // invalid ref-to-ref decl
9350 typedef int & int_ref;
9351 void foo(int_ref &); // valid ref-to-ref decl
9353 if (inner_declarator && inner_declarator->kind == cdk_reference)
9354 error ("cannot declare reference to %q#T, which is not "
9355 "a typedef or a template type argument", type);
9357 else if (TREE_CODE (type) == METHOD_TYPE)
9358 type = build_ptrmemfunc_type (build_pointer_type (type));
9359 else if (declarator->kind == cdk_ptrmem)
9361 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9363 if (declarator->u.pointer.class_type == error_mark_node)
9364 /* We will already have complained. */
9365 type = error_mark_node;
9367 type = build_ptrmem_type (declarator->u.pointer.class_type,
9371 type = build_pointer_type (type);
9373 /* Process a list of type modifier keywords (such as
9374 const or volatile) that were given inside the `*' or `&'. */
9376 if (declarator->u.pointer.qualifiers)
9379 = cp_build_qualified_type (type,
9380 declarator->u.pointer.qualifiers);
9381 type_quals = cp_type_quals (type);
9394 /* We need to stabilize side-effects in VLA sizes for regular array
9395 declarations too, not just pointers to arrays. */
9396 if (type != error_mark_node && !TYPE_NAME (type)
9397 && (decl_context == NORMAL || decl_context == FIELD)
9398 && at_function_scope_p ()
9399 && variably_modified_type_p (type, NULL_TREE))
9400 stabilize_vla_size (TYPE_SIZE (type));
9402 /* A `constexpr' specifier used in an object declaration declares
9403 the object as `const'. */
9404 if (constexpr_p && innermost_code != cdk_function)
9406 if (type_quals & TYPE_QUAL_CONST)
9407 error ("both %<const%> and %<constexpr%> cannot be used here");
9408 if (type_quals & TYPE_QUAL_VOLATILE)
9409 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9410 if (TREE_CODE (type) != REFERENCE_TYPE)
9412 type_quals |= TYPE_QUAL_CONST;
9413 type = cp_build_qualified_type (type, type_quals);
9417 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9418 && TREE_CODE (type) != FUNCTION_TYPE
9419 && TREE_CODE (type) != METHOD_TYPE)
9421 error ("template-id %qD used as a declarator",
9423 unqualified_id = dname;
9426 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9427 qualified with a class-name, turn it into a METHOD_TYPE, unless
9428 we know that the function is static. We take advantage of this
9429 opportunity to do other processing that pertains to entities
9430 explicitly declared to be class members. Note that if DECLARATOR
9431 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9432 would not have exited the loop above. */
9434 && declarator->u.id.qualifying_scope
9435 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9439 ctype = declarator->u.id.qualifying_scope;
9440 ctype = TYPE_MAIN_VARIANT (ctype);
9442 while (t != NULL_TREE && CLASS_TYPE_P (t))
9444 /* You're supposed to have one `template <...>' for every
9445 template class, but you don't need one for a full
9446 specialization. For example:
9448 template <class T> struct S{};
9449 template <> struct S<int> { void f(); };
9450 void S<int>::f () {}
9452 is correct; there shouldn't be a `template <>' for the
9453 definition of `S<int>::f'. */
9454 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9455 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9456 /* T is an explicit (not partial) specialization. All
9457 containing classes must therefore also be explicitly
9460 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9461 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9462 template_count += 1;
9464 t = TYPE_MAIN_DECL (t);
9465 t = DECL_CONTEXT (t);
9468 if (ctype == current_class_type)
9472 permerror (input_location, "member functions are implicitly friends of their class");
9476 permerror (declarator->id_loc,
9477 "extra qualification %<%T::%> on member %qs",
9480 else if (/* If the qualifying type is already complete, then we
9481 can skip the following checks. */
9482 !COMPLETE_TYPE_P (ctype)
9483 && (/* If the function is being defined, then
9484 qualifying type must certainly be complete. */
9486 /* A friend declaration of "T::f" is OK, even if
9487 "T" is a template parameter. But, if this
9488 function is not a friend, the qualifying type
9490 || (!friendp && !CLASS_TYPE_P (ctype))
9491 /* For a declaration, the type need not be
9492 complete, if either it is dependent (since there
9493 is no meaningful definition of complete in that
9494 case) or the qualifying class is currently being
9496 || !(dependent_type_p (ctype)
9497 || currently_open_class (ctype)))
9498 /* Check that the qualifying type is complete. */
9499 && !complete_type_or_else (ctype, NULL_TREE))
9500 return error_mark_node;
9501 else if (TREE_CODE (type) == FUNCTION_TYPE)
9503 if (current_class_type
9504 && (!friendp || funcdef_flag))
9507 ? G_("cannot define member function %<%T::%s%> "
9509 : G_("cannot declare member function %<%T::%s%> "
9511 ctype, name, current_class_type);
9512 return error_mark_node;
9515 else if (declspecs->specs[(int)ds_typedef]
9516 && current_class_type)
9518 error ("cannot declare member %<%T::%s%> within %qT",
9519 ctype, name, current_class_type);
9520 return error_mark_node;
9524 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9525 ctype = current_class_type;
9527 /* Now TYPE has the actual type. */
9532 *attrlist = chainon (returned_attrs, *attrlist);
9534 attrlist = &returned_attrs;
9537 /* Handle parameter packs. */
9538 if (parameter_pack_p)
9540 if (decl_context == PARM)
9541 /* Turn the type into a pack expansion.*/
9542 type = make_pack_expansion (type);
9544 error ("non-parameter %qs cannot be a parameter pack", name);
9547 /* Did array size calculations overflow? */
9549 if (TREE_CODE (type) == ARRAY_TYPE
9550 && COMPLETE_TYPE_P (type)
9551 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9552 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9554 error ("size of array %qs is too large", name);
9555 /* If we proceed with the array type as it is, we'll eventually
9556 crash in tree_low_cst(). */
9557 type = error_mark_node;
9560 if ((decl_context == FIELD || decl_context == PARM)
9561 && !processing_template_decl
9562 && variably_modified_type_p (type, NULL_TREE))
9564 if (decl_context == FIELD)
9565 error ("data member may not have variably modified type %qT", type);
9567 error ("parameter may not have variably modified type %qT", type);
9568 type = error_mark_node;
9571 if (explicitp == 1 || (explicitp && friendp))
9573 /* [dcl.fct.spec] The explicit specifier shall only be used in
9574 declarations of constructors within a class definition. */
9575 error ("only declarations of constructors can be %<explicit%>");
9579 if (storage_class == sc_mutable)
9581 if (decl_context != FIELD || friendp)
9583 error ("non-member %qs cannot be declared %<mutable%>", name);
9584 storage_class = sc_none;
9586 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9588 error ("non-object member %qs cannot be declared %<mutable%>", name);
9589 storage_class = sc_none;
9591 else if (TREE_CODE (type) == FUNCTION_TYPE
9592 || TREE_CODE (type) == METHOD_TYPE)
9594 error ("function %qs cannot be declared %<mutable%>", name);
9595 storage_class = sc_none;
9599 error ("static %qs cannot be declared %<mutable%>", name);
9600 storage_class = sc_none;
9602 else if (type_quals & TYPE_QUAL_CONST)
9604 error ("const %qs cannot be declared %<mutable%>", name);
9605 storage_class = sc_none;
9607 else if (TREE_CODE (type) == REFERENCE_TYPE)
9609 permerror (input_location, "reference %qs cannot be declared "
9610 "%<mutable%>", name);
9611 storage_class = sc_none;
9615 /* If this is declaring a typedef name, return a TYPE_DECL. */
9616 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9620 /* Note that the grammar rejects storage classes
9621 in typenames, fields or parameters. */
9622 if (current_lang_name == lang_name_java)
9623 TYPE_FOR_JAVA (type) = 1;
9625 /* This declaration:
9627 typedef void f(int) const;
9629 declares a function type which is not a member of any
9630 particular class, but which is cv-qualified; for
9631 example "f S::*" declares a pointer to a const-qualified
9632 member function of S. We record the cv-qualification in the
9634 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9636 type = apply_memfn_quals (type, memfn_quals);
9638 /* We have now dealt with these qualifiers. */
9639 memfn_quals = TYPE_UNQUALIFIED;
9642 if (type_uses_auto (type))
9644 error ("typedef declared %<auto%>");
9645 type = error_mark_node;
9648 if (decl_context == FIELD)
9649 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9651 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9652 if (id_declarator && declarator->u.id.qualifying_scope) {
9653 error_at (DECL_SOURCE_LOCATION (decl),
9654 "typedef name may not be a nested-name-specifier");
9655 TREE_TYPE (decl) = error_mark_node;
9658 if (decl_context != FIELD)
9660 if (!current_function_decl)
9661 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9662 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9663 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9664 (current_function_decl)))
9665 /* The TYPE_DECL is "abstract" because there will be
9666 clones of this constructor/destructor, and there will
9667 be copies of this TYPE_DECL generated in those
9669 DECL_ABSTRACT (decl) = 1;
9671 else if (constructor_name_p (unqualified_id, current_class_type))
9672 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9673 "as enclosing class",
9676 /* If the user declares "typedef struct {...} foo" then the
9677 struct will have an anonymous name. Fill that name in now.
9678 Nothing can refer to it, so nothing needs know about the name
9680 if (type != error_mark_node
9683 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9684 && TYPE_ANONYMOUS_P (type)
9685 && declspecs->type_definition_p
9686 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9690 /* Replace the anonymous name with the real name everywhere. */
9691 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9693 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9694 /* We do not rename the debug info representing the
9695 anonymous tagged type because the standard says in
9696 [dcl.typedef] that the naming applies only for
9697 linkage purposes. */
9698 /*debug_hooks->set_name (t, decl);*/
9699 TYPE_NAME (t) = decl;
9702 if (TYPE_LANG_SPECIFIC (type))
9703 TYPE_WAS_ANONYMOUS (type) = 1;
9705 /* If this is a typedef within a template class, the nested
9706 type is a (non-primary) template. The name for the
9707 template needs updating as well. */
9708 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9709 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9710 = TYPE_IDENTIFIER (type);
9712 /* Adjust linkage now that we aren't anonymous anymore. */
9713 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9714 determine_visibility (TYPE_MAIN_DECL (type));
9716 /* FIXME remangle member functions; member functions of a
9717 type with external linkage have external linkage. */
9721 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9722 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9724 bad_specifiers (decl, BSP_TYPE, virtualp,
9725 memfn_quals != TYPE_UNQUALIFIED,
9726 inlinep, friendp, raises != NULL_TREE);
9731 /* Detect the case of an array type of unspecified size
9732 which came, as such, direct from a typedef name.
9733 We must copy the type, so that the array's domain can be
9734 individually set by the object's initializer. */
9736 if (type && typedef_type
9737 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9738 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9739 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9741 /* Detect where we're using a typedef of function type to declare a
9742 function. PARMS will not be set, so we must create it now. */
9744 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9746 tree decls = NULL_TREE;
9749 for (args = TYPE_ARG_TYPES (type);
9750 args && args != void_list_node;
9751 args = TREE_CHAIN (args))
9753 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9755 DECL_CHAIN (decl) = decls;
9759 parms = nreverse (decls);
9761 if (decl_context != TYPENAME)
9763 /* A cv-qualifier-seq shall only be part of the function type
9764 for a non-static member function. [8.3.5/4 dcl.fct] */
9765 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9766 && (current_class_type == NULL_TREE || staticp) )
9769 ? G_("qualified function types cannot be used to "
9770 "declare static member functions")
9771 : G_("qualified function types cannot be used to "
9772 "declare free functions"));
9773 type = TYPE_MAIN_VARIANT (type);
9776 /* The qualifiers on the function type become the qualifiers on
9777 the non-static member function. */
9778 memfn_quals |= type_memfn_quals (type);
9779 type_quals = TYPE_UNQUALIFIED;
9783 /* If this is a type name (such as, in a cast or sizeof),
9784 compute the type and return it now. */
9786 if (decl_context == TYPENAME)
9788 /* Note that the grammar rejects storage classes
9789 in typenames, fields or parameters. */
9790 if (type_quals != TYPE_UNQUALIFIED)
9791 type_quals = TYPE_UNQUALIFIED;
9793 /* Special case: "friend class foo" looks like a TYPENAME context. */
9796 if (type_quals != TYPE_UNQUALIFIED)
9798 error ("type qualifiers specified for friend class declaration");
9799 type_quals = TYPE_UNQUALIFIED;
9803 error ("%<inline%> specified for friend class declaration");
9809 /* Don't allow friend declaration without a class-key. */
9810 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9811 permerror (input_location, "template parameters cannot be friends");
9812 else if (TREE_CODE (type) == TYPENAME_TYPE)
9813 permerror (input_location, "friend declaration requires class-key, "
9814 "i.e. %<friend class %T::%D%>",
9815 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9817 permerror (input_location, "friend declaration requires class-key, "
9818 "i.e. %<friend %#T%>",
9822 /* Only try to do this stuff if we didn't already give up. */
9823 if (type != integer_type_node)
9825 /* A friendly class? */
9826 if (current_class_type)
9827 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9830 error ("trying to make class %qT a friend of global scope",
9833 type = void_type_node;
9836 else if (memfn_quals)
9838 if (ctype == NULL_TREE
9839 && TREE_CODE (type) == METHOD_TYPE)
9840 ctype = TYPE_METHOD_BASETYPE (type);
9843 type = build_memfn_type (type, ctype, memfn_quals);
9844 /* Core issue #547: need to allow this in template type args. */
9845 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9846 type = apply_memfn_quals (type, memfn_quals);
9848 error ("invalid qualifiers on non-member function type");
9853 else if (unqualified_id == NULL_TREE && decl_context != PARM
9854 && decl_context != CATCHPARM
9855 && TREE_CODE (type) != UNION_TYPE
9858 error ("abstract declarator %qT used as declaration", type);
9859 return error_mark_node;
9862 /* Only functions may be declared using an operator-function-id. */
9864 && IDENTIFIER_OPNAME_P (unqualified_id)
9865 && TREE_CODE (type) != FUNCTION_TYPE
9866 && TREE_CODE (type) != METHOD_TYPE)
9868 error ("declaration of %qD as non-function", unqualified_id);
9869 return error_mark_node;
9872 /* We don't check parameter types here because we can emit a better
9873 error message later. */
9874 if (decl_context != PARM)
9876 type = check_var_type (unqualified_id, type);
9877 if (type == error_mark_node)
9878 return error_mark_node;
9881 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9882 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9884 if (decl_context == PARM || decl_context == CATCHPARM)
9886 if (ctype || in_namespace)
9887 error ("cannot use %<::%> in parameter declaration");
9889 if (type_uses_auto (type))
9891 error ("parameter declared %<auto%>");
9892 type = error_mark_node;
9895 /* A parameter declared as an array of T is really a pointer to T.
9896 One declared as a function is really a pointer to a function.
9897 One declared as a member is really a pointer to member. */
9899 if (TREE_CODE (type) == ARRAY_TYPE)
9901 /* Transfer const-ness of array into that of type pointed to. */
9902 type = build_pointer_type (TREE_TYPE (type));
9903 type_quals = TYPE_UNQUALIFIED;
9905 else if (TREE_CODE (type) == FUNCTION_TYPE)
9906 type = build_pointer_type (type);
9909 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9910 && !NEW_DELETE_OPNAME_P (unqualified_id))
9912 cp_cv_quals real_quals = memfn_quals;
9913 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9914 real_quals |= TYPE_QUAL_CONST;
9915 type = build_memfn_type (type, ctype, real_quals);
9921 if (decl_context == PARM)
9923 decl = cp_build_parm_decl (unqualified_id, type);
9925 bad_specifiers (decl, BSP_PARM, virtualp,
9926 memfn_quals != TYPE_UNQUALIFIED,
9927 inlinep, friendp, raises != NULL_TREE);
9929 else if (decl_context == FIELD)
9931 /* The C99 flexible array extension. */
9932 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9933 && TYPE_DOMAIN (type) == NULL_TREE)
9935 tree itype = compute_array_index_type (dname, integer_zero_node,
9936 tf_warning_or_error);
9937 type = build_cplus_array_type (TREE_TYPE (type), itype);
9940 if (type == error_mark_node)
9942 /* Happens when declaring arrays of sizes which
9943 are error_mark_node, for example. */
9946 else if (in_namespace && !friendp)
9948 /* Something like struct S { int N::j; }; */
9949 error ("invalid use of %<::%>");
9950 return error_mark_node;
9952 else if (TREE_CODE (type) == FUNCTION_TYPE
9953 || TREE_CODE (type) == METHOD_TYPE)
9956 tree function_context;
9960 /* This should never happen in pure C++ (the check
9961 could be an assert). It could happen in
9962 Objective-C++ if someone writes invalid code that
9963 uses a function declaration for an instance
9964 variable or property (instance variables and
9965 properties are parsed as FIELD_DECLs, but they are
9966 part of an Objective-C class, not a C++ class).
9967 That code is invalid and is caught by this
9971 error ("declaration of function %qD in invalid context",
9973 return error_mark_node;
9976 /* ``A union may [ ... ] not [ have ] virtual functions.''
9978 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9980 error ("function %qD declared virtual inside a union",
9982 return error_mark_node;
9985 if (NEW_DELETE_OPNAME_P (unqualified_id))
9989 error ("%qD cannot be declared virtual, since it "
9997 /* Check that the name used for a destructor makes sense. */
9998 if (sfk == sfk_destructor)
10000 tree uqname = id_declarator->u.id.unqualified_name;
10004 gcc_assert (friendp);
10005 error ("expected qualified name in friend declaration "
10006 "for destructor %qD", uqname);
10007 return error_mark_node;
10010 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10012 error ("declaration of %qD as member of %qT",
10014 return error_mark_node;
10018 error ("a destructor cannot be %<constexpr%>");
10019 return error_mark_node;
10022 else if (sfk == sfk_constructor && friendp && !ctype)
10024 error ("expected qualified name in friend declaration "
10025 "for constructor %qD",
10026 id_declarator->u.id.unqualified_name);
10027 return error_mark_node;
10030 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10031 function_context = (ctype != NULL_TREE) ?
10032 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10033 publicp = (! friendp || ! staticp)
10034 && function_context == NULL_TREE;
10035 decl = grokfndecl (ctype, type,
10036 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10037 ? unqualified_id : dname,
10040 virtualp, flags, memfn_quals, raises,
10041 friendp ? -1 : 0, friendp, publicp,
10042 inlinep | (2 * constexpr_p),
10044 funcdef_flag, template_count, in_namespace,
10045 attrlist, declarator->id_loc);
10046 decl = set_virt_specifiers (decl, virt_specifiers);
10047 if (decl == NULL_TREE)
10048 return error_mark_node;
10050 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10051 /* The decl and setting of decl_attr is also turned off. */
10052 decl = build_decl_attribute_variant (decl, decl_attr);
10055 /* [class.conv.ctor]
10057 A constructor declared without the function-specifier
10058 explicit that can be called with a single parameter
10059 specifies a conversion from the type of its first
10060 parameter to the type of its class. Such a constructor
10061 is called a converting constructor. */
10062 if (explicitp == 2)
10063 DECL_NONCONVERTING_P (decl) = 1;
10065 else if (!staticp && !dependent_type_p (type)
10066 && !COMPLETE_TYPE_P (complete_type (type))
10067 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10069 if (unqualified_id)
10070 error ("field %qD has incomplete type", unqualified_id);
10072 error ("name %qT has incomplete type", type);
10074 /* If we're instantiating a template, tell them which
10075 instantiation made the field's type be incomplete. */
10076 if (current_class_type
10077 && TYPE_NAME (current_class_type)
10078 && IDENTIFIER_TEMPLATE (current_class_name)
10080 && declspecs->type == type)
10081 error (" in instantiation of template %qT",
10082 current_class_type);
10084 return error_mark_node;
10090 error ("%qE is neither function nor member function; "
10091 "cannot be declared friend", unqualified_id);
10099 /* Friends are treated specially. */
10100 if (ctype == current_class_type)
10101 ; /* We already issued a permerror. */
10102 else if (decl && DECL_NAME (decl))
10104 if (template_class_depth (current_class_type) == 0)
10106 decl = check_explicit_specialization
10107 (unqualified_id, decl, template_count,
10108 2 * funcdef_flag + 4);
10109 if (decl == error_mark_node)
10110 return error_mark_node;
10113 decl = do_friend (ctype, unqualified_id, decl,
10119 return error_mark_node;
10122 /* Structure field. It may not be a function, except for C++. */
10124 if (decl == NULL_TREE)
10128 /* C++ allows static class members. All other work
10129 for this is done by grokfield. */
10130 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10131 set_linkage_for_static_data_member (decl);
10132 /* Even if there is an in-class initialization, DECL
10133 is considered undefined until an out-of-class
10134 definition is provided. */
10135 DECL_EXTERNAL (decl) = 1;
10138 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10140 if (constexpr_p && !initialized)
10142 error ("constexpr static data member %qD must have an "
10143 "initializer", decl);
10144 constexpr_p = false;
10151 error ("non-static data member %qE declared %<constexpr%>",
10153 constexpr_p = false;
10155 decl = build_decl (input_location,
10156 FIELD_DECL, unqualified_id, type);
10157 DECL_NONADDRESSABLE_P (decl) = bitfield;
10158 if (bitfield && !unqualified_id)
10159 TREE_NO_WARNING (decl) = 1;
10161 if (storage_class == sc_mutable)
10163 DECL_MUTABLE_P (decl) = 1;
10164 storage_class = sc_none;
10168 /* An attempt is being made to initialize a non-static
10169 member. This is new in C++11. */
10170 maybe_warn_cpp0x (CPP0X_NSDMI);
10173 bad_specifiers (decl, BSP_FIELD, virtualp,
10174 memfn_quals != TYPE_UNQUALIFIED,
10175 inlinep, friendp, raises != NULL_TREE);
10178 else if (TREE_CODE (type) == FUNCTION_TYPE
10179 || TREE_CODE (type) == METHOD_TYPE)
10181 tree original_name;
10184 if (!unqualified_id)
10185 return error_mark_node;
10187 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10188 original_name = dname;
10190 original_name = unqualified_id;
10192 if (storage_class == sc_auto)
10193 error ("storage class %<auto%> invalid for function %qs", name);
10194 else if (storage_class == sc_register)
10195 error ("storage class %<register%> invalid for function %qs", name);
10197 error ("storage class %<__thread%> invalid for function %qs", name);
10199 if (virt_specifiers)
10200 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10201 /* Function declaration not at top level.
10202 Storage classes other than `extern' are not allowed
10203 and `extern' makes no difference. */
10204 if (! toplevel_bindings_p ()
10205 && (storage_class == sc_static
10206 || declspecs->specs[(int)ds_inline])
10209 if (storage_class == sc_static)
10210 pedwarn (input_location, OPT_pedantic,
10211 "%<static%> specified invalid for function %qs "
10212 "declared out of global scope", name);
10214 pedwarn (input_location, OPT_pedantic,
10215 "%<inline%> specifier invalid for function %qs "
10216 "declared out of global scope", name);
10219 if (ctype == NULL_TREE)
10223 error ("virtual non-class function %qs", name);
10226 else if (sfk == sfk_constructor
10227 || sfk == sfk_destructor)
10229 error (funcdef_flag
10230 ? G_("%qs defined in a non-class scope")
10231 : G_("%qs declared in a non-class scope"), name);
10236 /* Record presence of `static'. */
10237 publicp = (ctype != NULL_TREE
10238 || storage_class == sc_extern
10239 || storage_class != sc_static);
10241 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10242 virtualp, flags, memfn_quals, raises,
10244 publicp, inlinep | (2 * constexpr_p), sfk,
10246 template_count, in_namespace, attrlist,
10247 declarator->id_loc);
10248 if (decl == NULL_TREE)
10249 return error_mark_node;
10253 int invalid_static = 0;
10255 /* Don't allow a static member function in a class, and forbid
10256 declaring main to be static. */
10257 if (TREE_CODE (type) == METHOD_TYPE)
10259 permerror (input_location, "cannot declare member function %qD to have "
10260 "static linkage", decl);
10261 invalid_static = 1;
10263 else if (current_function_decl)
10265 /* FIXME need arm citation */
10266 error ("cannot declare static function inside another function");
10267 invalid_static = 1;
10270 if (invalid_static)
10273 storage_class = sc_none;
10279 /* It's a variable. */
10281 /* An uninitialized decl with `extern' is a reference. */
10282 decl = grokvardecl (type, unqualified_id,
10285 (type_quals & TYPE_QUAL_CONST) != 0,
10286 ctype ? ctype : in_namespace);
10287 bad_specifiers (decl, BSP_VAR, virtualp,
10288 memfn_quals != TYPE_UNQUALIFIED,
10289 inlinep, friendp, raises != NULL_TREE);
10293 DECL_CONTEXT (decl) = ctype;
10296 permerror (input_location, "%<static%> may not be used when defining "
10297 "(as opposed to declaring) a static data member");
10299 storage_class = sc_none;
10301 if (storage_class == sc_register && TREE_STATIC (decl))
10303 error ("static member %qD declared %<register%>", decl);
10304 storage_class = sc_none;
10306 if (storage_class == sc_extern && pedantic)
10308 pedwarn (input_location, OPT_pedantic,
10309 "cannot explicitly declare member %q#D to have "
10310 "extern linkage", decl);
10311 storage_class = sc_none;
10314 else if (constexpr_p && DECL_EXTERNAL (decl))
10316 error ("declaration of constexpr variable %qD is not a definition",
10318 constexpr_p = false;
10322 if (storage_class == sc_extern && initialized && !funcdef_flag)
10324 if (toplevel_bindings_p ())
10326 /* It's common practice (and completely valid) to have a const
10327 be initialized and declared extern. */
10328 if (!(type_quals & TYPE_QUAL_CONST))
10329 warning (0, "%qs initialized and declared %<extern%>", name);
10333 error ("%qs has both %<extern%> and initializer", name);
10334 return error_mark_node;
10338 /* Record `register' declaration for warnings on &
10339 and in case doing stupid register allocation. */
10341 if (storage_class == sc_register)
10342 DECL_REGISTER (decl) = 1;
10343 else if (storage_class == sc_extern)
10344 DECL_THIS_EXTERN (decl) = 1;
10345 else if (storage_class == sc_static)
10346 DECL_THIS_STATIC (decl) = 1;
10348 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10349 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10350 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10352 /* Record constancy and volatility on the DECL itself . There's
10353 no need to do this when processing a template; we'll do this
10354 for the instantiated declaration based on the type of DECL. */
10355 if (!processing_template_decl)
10356 cp_apply_type_quals_to_decl (type_quals, decl);
10362 /* Subroutine of start_function. Ensure that each of the parameter
10363 types (as listed in PARMS) is complete, as is required for a
10364 function definition. */
10367 require_complete_types_for_parms (tree parms)
10369 for (; parms; parms = DECL_CHAIN (parms))
10371 if (dependent_type_p (TREE_TYPE (parms)))
10373 if (!VOID_TYPE_P (TREE_TYPE (parms))
10374 && complete_type_or_else (TREE_TYPE (parms), parms))
10376 relayout_decl (parms);
10377 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10380 /* grokparms or complete_type_or_else will have already issued
10382 TREE_TYPE (parms) = error_mark_node;
10386 /* Returns nonzero if T is a local variable. */
10389 local_variable_p (const_tree t)
10391 if ((TREE_CODE (t) == VAR_DECL
10392 /* A VAR_DECL with a context that is a _TYPE is a static data
10394 && !TYPE_P (CP_DECL_CONTEXT (t))
10395 /* Any other non-local variable must be at namespace scope. */
10396 && !DECL_NAMESPACE_SCOPE_P (t))
10397 || (TREE_CODE (t) == PARM_DECL))
10403 /* Like local_variable_p, but suitable for use as a tree-walking
10407 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10408 void *data ATTRIBUTE_UNUSED)
10410 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10412 else if (TYPE_P (*tp))
10413 *walk_subtrees = 0;
10419 /* Check that ARG, which is a default-argument expression for a
10420 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10421 something goes wrong. DECL may also be a _TYPE node, rather than a
10422 DECL, if there is no DECL available. */
10425 check_default_argument (tree decl, tree arg)
10430 if (TREE_CODE (arg) == DEFAULT_ARG)
10431 /* We get a DEFAULT_ARG when looking at an in-class declaration
10432 with a default argument. Ignore the argument for now; we'll
10433 deal with it after the class is complete. */
10442 decl_type = TREE_TYPE (decl);
10444 if (arg == error_mark_node
10445 || decl == error_mark_node
10446 || TREE_TYPE (arg) == error_mark_node
10447 || decl_type == error_mark_node)
10448 /* Something already went wrong. There's no need to check
10450 return error_mark_node;
10452 /* [dcl.fct.default]
10454 A default argument expression is implicitly converted to the
10456 if (!TREE_TYPE (arg)
10457 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10460 error ("default argument for %q#D has type %qT",
10461 decl, TREE_TYPE (arg));
10463 error ("default argument for parameter of type %qT has type %qT",
10464 decl_type, TREE_TYPE (arg));
10466 return error_mark_node;
10469 /* [dcl.fct.default]
10471 Local variables shall not be used in default argument
10474 The keyword `this' shall not be used in a default argument of a
10475 member function. */
10476 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10479 error ("default argument %qE uses local variable %qD", arg, var);
10480 return error_mark_node;
10487 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10490 type_is_deprecated (tree type)
10492 enum tree_code code;
10493 if (TREE_DEPRECATED (type))
10495 if (TYPE_NAME (type)
10496 && TREE_DEPRECATED (TYPE_NAME (type)))
10499 /* Do warn about using typedefs to a deprecated class. */
10500 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10501 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10503 code = TREE_CODE (type);
10505 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10506 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10507 || code == METHOD_TYPE || code == ARRAY_TYPE)
10508 return type_is_deprecated (TREE_TYPE (type));
10510 if (TYPE_PTRMEMFUNC_P (type))
10511 return type_is_deprecated
10512 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10517 /* Decode the list of parameter types for a function type.
10518 Given the list of things declared inside the parens,
10519 return a list of types.
10521 If this parameter does not end with an ellipsis, we append
10524 *PARMS is set to the chain of PARM_DECLs created. */
10527 grokparms (tree parmlist, tree *parms)
10529 tree result = NULL_TREE;
10530 tree decls = NULL_TREE;
10534 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10536 tree type = NULL_TREE;
10537 tree init = TREE_PURPOSE (parm);
10538 tree decl = TREE_VALUE (parm);
10539 const char *errmsg;
10541 if (parm == void_list_node)
10544 if (! decl || TREE_TYPE (decl) == error_mark_node)
10547 type = TREE_TYPE (decl);
10548 if (VOID_TYPE_P (type))
10550 if (same_type_p (type, void_type_node)
10551 && DECL_SELF_REFERENCE_P (type)
10552 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10553 /* this is a parmlist of `(void)', which is ok. */
10555 cxx_incomplete_type_error (decl, type);
10556 /* It's not a good idea to actually create parameters of
10557 type `void'; other parts of the compiler assume that a
10558 void type terminates the parameter list. */
10559 type = error_mark_node;
10560 TREE_TYPE (decl) = error_mark_node;
10563 if (type != error_mark_node
10564 && TYPE_FOR_JAVA (type)
10565 && MAYBE_CLASS_TYPE_P (type))
10567 error ("parameter %qD has Java class type", decl);
10568 type = error_mark_node;
10569 TREE_TYPE (decl) = error_mark_node;
10573 if (type != error_mark_node
10574 && (errmsg = targetm.invalid_parameter_type (type)))
10577 type = error_mark_node;
10578 TREE_TYPE (decl) = error_mark_node;
10581 if (type != error_mark_node)
10583 if (deprecated_state != DEPRECATED_SUPPRESS)
10585 tree deptype = type_is_deprecated (type);
10587 warn_deprecated_use (deptype, NULL_TREE);
10590 /* Top-level qualifiers on the parameters are
10591 ignored for function types. */
10592 type = cp_build_qualified_type (type, 0);
10593 if (TREE_CODE (type) == METHOD_TYPE)
10595 error ("parameter %qD invalidly declared method type", decl);
10596 type = build_pointer_type (type);
10597 TREE_TYPE (decl) = type;
10599 else if (abstract_virtuals_error (decl, type))
10600 any_error = 1; /* Seems like a good idea. */
10601 else if (POINTER_TYPE_P (type))
10603 /* [dcl.fct]/6, parameter types cannot contain pointers
10604 (references) to arrays of unknown bound. */
10605 tree t = TREE_TYPE (type);
10606 int ptr = TYPE_PTR_P (type);
10610 if (TYPE_PTR_P (t))
10612 else if (TREE_CODE (t) != ARRAY_TYPE)
10614 else if (!TYPE_DOMAIN (t))
10618 if (TREE_CODE (t) == ARRAY_TYPE)
10620 ? G_("parameter %qD includes pointer to array of "
10621 "unknown bound %qT")
10622 : G_("parameter %qD includes reference to array of "
10623 "unknown bound %qT"),
10629 else if (init && !processing_template_decl)
10630 init = check_default_argument (decl, init);
10633 DECL_CHAIN (decl) = decls;
10635 result = tree_cons (init, type, result);
10637 decls = nreverse (decls);
10638 result = nreverse (result);
10640 result = chainon (result, void_list_node);
10647 /* D is a constructor or overloaded `operator='.
10649 Let T be the class in which D is declared. Then, this function
10652 -1 if D's is an ill-formed constructor or copy assignment operator
10653 whose first parameter is of type `T'.
10654 0 if D is not a copy constructor or copy assignment
10656 1 if D is a copy constructor or copy assignment operator whose
10657 first parameter is a reference to non-const qualified T.
10658 2 if D is a copy constructor or copy assignment operator whose
10659 first parameter is a reference to const qualified T.
10661 This function can be used as a predicate. Positive values indicate
10662 a copy constructor and nonzero values indicate a copy assignment
10666 copy_fn_p (const_tree d)
10672 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10674 if (TREE_CODE (d) == TEMPLATE_DECL
10675 || (DECL_TEMPLATE_INFO (d)
10676 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10677 /* Instantiations of template member functions are never copy
10678 functions. Note that member functions of templated classes are
10679 represented as template functions internally, and we must
10680 accept those as copy functions. */
10683 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10687 arg_type = TREE_VALUE (args);
10688 if (arg_type == error_mark_node)
10691 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10693 /* Pass by value copy assignment operator. */
10696 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10697 && !TYPE_REF_IS_RVALUE (arg_type)
10698 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10700 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10706 args = TREE_CHAIN (args);
10708 if (args && args != void_list_node && !TREE_PURPOSE (args))
10709 /* There are more non-optional args. */
10715 /* D is a constructor or overloaded `operator='.
10717 Let T be the class in which D is declared. Then, this function
10718 returns true when D is a move constructor or move assignment
10719 operator, false otherwise. */
10722 move_fn_p (const_tree d)
10726 bool result = false;
10728 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10730 if (cxx_dialect == cxx98)
10731 /* There are no move constructors if we are in C++98 mode. */
10734 if (TREE_CODE (d) == TEMPLATE_DECL
10735 || (DECL_TEMPLATE_INFO (d)
10736 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10737 /* Instantiations of template member functions are never copy
10738 functions. Note that member functions of templated classes are
10739 represented as template functions internally, and we must
10740 accept those as copy functions. */
10743 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10747 arg_type = TREE_VALUE (args);
10748 if (arg_type == error_mark_node)
10751 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10752 && TYPE_REF_IS_RVALUE (arg_type)
10753 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10757 args = TREE_CHAIN (args);
10759 if (args && args != void_list_node && !TREE_PURPOSE (args))
10760 /* There are more non-optional args. */
10766 /* Remember any special properties of member function DECL. */
10769 grok_special_member_properties (tree decl)
10773 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10776 class_type = DECL_CONTEXT (decl);
10777 if (DECL_CONSTRUCTOR_P (decl))
10779 int ctor = copy_fn_p (decl);
10781 if (!DECL_ARTIFICIAL (decl))
10782 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10788 A non-template constructor for class X is a copy
10789 constructor if its first parameter is of type X&, const
10790 X&, volatile X& or const volatile X&, and either there
10791 are no other parameters or else all other parameters have
10792 default arguments. */
10793 TYPE_HAS_COPY_CTOR (class_type) = 1;
10794 if (user_provided_p (decl))
10795 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10797 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10799 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10801 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10802 if (user_provided_p (decl))
10803 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10805 else if (move_fn_p (decl) && user_provided_p (decl))
10806 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10807 else if (is_list_ctor (decl))
10808 TYPE_HAS_LIST_CTOR (class_type) = 1;
10810 if (DECL_DECLARED_CONSTEXPR_P (decl)
10811 && !copy_fn_p (decl) && !move_fn_p (decl))
10812 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10814 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10818 A non-template assignment operator for class X is a copy
10819 assignment operator if its parameter is of type X, X&, const
10820 X&, volatile X& or const volatile X&. */
10822 int assop = copy_fn_p (decl);
10826 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10827 if (user_provided_p (decl))
10828 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10830 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10832 else if (move_fn_p (decl) && user_provided_p (decl))
10833 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10835 /* Destructors are handled in check_methods. */
10838 /* Check a constructor DECL has the correct form. Complains
10839 if the class has a constructor of the form X(X). */
10842 grok_ctor_properties (const_tree ctype, const_tree decl)
10844 int ctor_parm = copy_fn_p (decl);
10850 A declaration of a constructor for a class X is ill-formed if
10851 its first parameter is of type (optionally cv-qualified) X
10852 and either there are no other parameters or else all other
10853 parameters have default arguments.
10855 We *don't* complain about member template instantiations that
10856 have this form, though; they can occur as we try to decide
10857 what constructor to use during overload resolution. Since
10858 overload resolution will never prefer such a constructor to
10859 the non-template copy constructor (which is either explicitly
10860 or implicitly defined), there's no need to worry about their
10861 existence. Theoretically, they should never even be
10862 instantiated, but that's hard to forestall. */
10863 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10871 /* An operator with this code is unary, but can also be binary. */
10874 ambi_op_p (enum tree_code code)
10876 return (code == INDIRECT_REF
10877 || code == ADDR_EXPR
10878 || code == UNARY_PLUS_EXPR
10879 || code == NEGATE_EXPR
10880 || code == PREINCREMENT_EXPR
10881 || code == PREDECREMENT_EXPR);
10884 /* An operator with this name can only be unary. */
10887 unary_op_p (enum tree_code code)
10889 return (code == TRUTH_NOT_EXPR
10890 || code == BIT_NOT_EXPR
10891 || code == COMPONENT_REF
10892 || code == TYPE_EXPR);
10895 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10896 errors are issued for invalid declarations. */
10899 grok_op_properties (tree decl, bool complain)
10901 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10903 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10904 tree name = DECL_NAME (decl);
10905 enum tree_code operator_code;
10910 /* Count the number of arguments and check for ellipsis. */
10911 for (argtype = argtypes, arity = 0;
10912 argtype && argtype != void_list_node;
10913 argtype = TREE_CHAIN (argtype))
10915 ellipsis_p = !argtype;
10917 class_type = DECL_CONTEXT (decl);
10918 if (class_type && !CLASS_TYPE_P (class_type))
10919 class_type = NULL_TREE;
10921 if (DECL_CONV_FN_P (decl))
10922 operator_code = TYPE_EXPR;
10926 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10927 if (ansi_opname (CODE) == name) \
10929 operator_code = (CODE); \
10932 else if (ansi_assopname (CODE) == name) \
10934 operator_code = (CODE); \
10935 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10939 #include "operators.def"
10940 #undef DEF_OPERATOR
10942 gcc_unreachable ();
10945 gcc_assert (operator_code != MAX_TREE_CODES);
10946 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10949 switch (operator_code)
10952 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10956 TYPE_GETS_DELETE (class_type) |= 1;
10960 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10963 case VEC_DELETE_EXPR:
10964 TYPE_GETS_DELETE (class_type) |= 2;
10971 /* [basic.std.dynamic.allocation]/1:
10973 A program is ill-formed if an allocation function is declared
10974 in a namespace scope other than global scope or declared static
10977 The same also holds true for deallocation functions. */
10978 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10979 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10981 if (DECL_NAMESPACE_SCOPE_P (decl))
10983 if (CP_DECL_CONTEXT (decl) != global_namespace)
10985 error ("%qD may not be declared within a namespace", decl);
10988 else if (!TREE_PUBLIC (decl))
10990 error ("%qD may not be declared as static", decl);
10996 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10998 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10999 DECL_IS_OPERATOR_NEW (decl) = 1;
11001 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11002 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11005 /* An operator function must either be a non-static member function
11006 or have at least one parameter of a class, a reference to a class,
11007 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11008 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11010 if (operator_code == TYPE_EXPR
11011 || operator_code == CALL_EXPR
11012 || operator_code == COMPONENT_REF
11013 || operator_code == ARRAY_REF
11014 || operator_code == NOP_EXPR)
11016 error ("%qD must be a nonstatic member function", decl);
11023 if (DECL_STATIC_FUNCTION_P (decl))
11025 error ("%qD must be either a non-static member "
11026 "function or a non-member function", decl);
11030 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11032 tree arg = non_reference (TREE_VALUE (p));
11033 if (arg == error_mark_node)
11036 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11037 because these checks are performed even on
11038 template functions. */
11039 if (MAYBE_CLASS_TYPE_P (arg)
11040 || TREE_CODE (arg) == ENUMERAL_TYPE)
11044 if (!p || p == void_list_node)
11047 error ("%qD must have an argument of class or "
11048 "enumerated type", decl);
11054 /* There are no restrictions on the arguments to an overloaded
11056 if (operator_code == CALL_EXPR)
11059 /* Warn about conversion operators that will never be used. */
11060 if (IDENTIFIER_TYPENAME_P (name)
11061 && ! DECL_TEMPLATE_INFO (decl)
11063 /* Warn only declaring the function; there is no need to
11064 warn again about out-of-class definitions. */
11065 && class_type == current_class_type)
11067 tree t = TREE_TYPE (name);
11068 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11071 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11073 if (TREE_CODE (t) == VOID_TYPE)
11074 warning (OPT_Wconversion,
11076 ? G_("conversion to a reference to void "
11077 "will never use a type conversion operator")
11078 : G_("conversion to void "
11079 "will never use a type conversion operator"));
11080 else if (class_type)
11082 if (t == class_type)
11083 warning (OPT_Wconversion,
11085 ? G_("conversion to a reference to the same type "
11086 "will never use a type conversion operator")
11087 : G_("conversion to the same type "
11088 "will never use a type conversion operator"));
11089 /* Don't force t to be complete here. */
11090 else if (MAYBE_CLASS_TYPE_P (t)
11091 && COMPLETE_TYPE_P (t)
11092 && DERIVED_FROM_P (t, class_type))
11093 warning (OPT_Wconversion,
11095 ? G_("conversion to a reference to a base class "
11096 "will never use a type conversion operator")
11097 : G_("conversion to a base class "
11098 "will never use a type conversion operator"));
11103 if (operator_code == COND_EXPR)
11106 error ("ISO C++ prohibits overloading operator ?:");
11109 else if (ellipsis_p)
11111 error ("%qD must not have variable number of arguments", decl);
11114 else if (ambi_op_p (operator_code))
11117 /* We pick the one-argument operator codes by default, so
11118 we don't have to change anything. */
11120 else if (arity == 2)
11122 /* If we thought this was a unary operator, we now know
11123 it to be a binary operator. */
11124 switch (operator_code)
11127 operator_code = MULT_EXPR;
11131 operator_code = BIT_AND_EXPR;
11134 case UNARY_PLUS_EXPR:
11135 operator_code = PLUS_EXPR;
11139 operator_code = MINUS_EXPR;
11142 case PREINCREMENT_EXPR:
11143 operator_code = POSTINCREMENT_EXPR;
11146 case PREDECREMENT_EXPR:
11147 operator_code = POSTDECREMENT_EXPR;
11151 gcc_unreachable ();
11154 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11156 if ((operator_code == POSTINCREMENT_EXPR
11157 || operator_code == POSTDECREMENT_EXPR)
11158 && ! processing_template_decl
11159 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11162 error ("postfix %qD must take %<int%> as its argument",
11165 error ("postfix %qD must take %<int%> as its second "
11173 error ("%qD must take either zero or one argument", decl);
11175 error ("%qD must take either one or two arguments", decl);
11179 /* More Effective C++ rule 6. */
11181 && (operator_code == POSTINCREMENT_EXPR
11182 || operator_code == POSTDECREMENT_EXPR
11183 || operator_code == PREINCREMENT_EXPR
11184 || operator_code == PREDECREMENT_EXPR))
11186 tree arg = TREE_VALUE (argtypes);
11187 tree ret = TREE_TYPE (TREE_TYPE (decl));
11188 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11189 arg = TREE_TYPE (arg);
11190 arg = TYPE_MAIN_VARIANT (arg);
11191 if (operator_code == PREINCREMENT_EXPR
11192 || operator_code == PREDECREMENT_EXPR)
11194 if (TREE_CODE (ret) != REFERENCE_TYPE
11195 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11197 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11198 build_reference_type (arg));
11202 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11203 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11207 else if (unary_op_p (operator_code))
11212 error ("%qD must take %<void%>", decl);
11214 error ("%qD must take exactly one argument", decl);
11218 else /* if (binary_op_p (operator_code)) */
11223 error ("%qD must take exactly one argument", decl);
11225 error ("%qD must take exactly two arguments", decl);
11229 /* More Effective C++ rule 7. */
11231 && (operator_code == TRUTH_ANDIF_EXPR
11232 || operator_code == TRUTH_ORIF_EXPR
11233 || operator_code == COMPOUND_EXPR))
11234 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11238 /* Effective C++ rule 23. */
11241 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11242 && (operator_code == PLUS_EXPR
11243 || operator_code == MINUS_EXPR
11244 || operator_code == TRUNC_DIV_EXPR
11245 || operator_code == MULT_EXPR
11246 || operator_code == TRUNC_MOD_EXPR)
11247 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11248 warning (OPT_Weffc__, "%qD should return by value", decl);
11250 /* [over.oper]/8 */
11251 for (; argtypes && argtypes != void_list_node;
11252 argtypes = TREE_CHAIN (argtypes))
11253 if (TREE_PURPOSE (argtypes))
11255 TREE_PURPOSE (argtypes) = NULL_TREE;
11256 if (operator_code == POSTINCREMENT_EXPR
11257 || operator_code == POSTDECREMENT_EXPR)
11259 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11264 error ("%qD cannot have default arguments", decl);
11272 /* Return a string giving the keyword associate with CODE. */
11274 static const char *
11275 tag_name (enum tag_types code)
11287 case typename_type:
11290 gcc_unreachable ();
11294 /* Name lookup in an elaborated-type-specifier (after the keyword
11295 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11296 elaborated-type-specifier is invalid, issue a diagnostic and return
11297 error_mark_node; otherwise, return the *_TYPE to which it referred.
11298 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11301 check_elaborated_type_specifier (enum tag_types tag_code,
11303 bool allow_template_p)
11309 struct S { struct S *p; };
11311 name lookup will find the TYPE_DECL for the implicit "S::S"
11312 typedef. Adjust for that here. */
11313 if (DECL_SELF_REFERENCE_P (decl))
11314 decl = TYPE_NAME (TREE_TYPE (decl));
11316 type = TREE_TYPE (decl);
11318 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11319 is false for this case as well. */
11320 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11322 error ("using template type parameter %qT after %qs",
11323 type, tag_name (tag_code));
11324 return error_mark_node;
11328 If the identifier resolves to a typedef-name or a template
11329 type-parameter, the elaborated-type-specifier is ill-formed.
11331 In other words, the only legitimate declaration to use in the
11332 elaborated type specifier is the implicit typedef created when
11333 the type is declared. */
11334 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11335 && !DECL_SELF_REFERENCE_P (decl)
11336 && tag_code != typename_type)
11338 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11339 error ("%q+D has a previous declaration here", decl);
11340 return error_mark_node;
11342 else if (TREE_CODE (type) != RECORD_TYPE
11343 && TREE_CODE (type) != UNION_TYPE
11344 && tag_code != enum_type
11345 && tag_code != typename_type)
11347 error ("%qT referred to as %qs", type, tag_name (tag_code));
11348 error ("%q+T has a previous declaration here", type);
11349 return error_mark_node;
11351 else if (TREE_CODE (type) != ENUMERAL_TYPE
11352 && tag_code == enum_type)
11354 error ("%qT referred to as enum", type);
11355 error ("%q+T has a previous declaration here", type);
11356 return error_mark_node;
11358 else if (!allow_template_p
11359 && TREE_CODE (type) == RECORD_TYPE
11360 && CLASSTYPE_IS_TEMPLATE (type))
11362 /* If a class template appears as elaborated type specifier
11363 without a template header such as:
11365 template <class T> class C {};
11366 void f(class C); // No template header here
11368 then the required template argument is missing. */
11369 error ("template argument required for %<%s %T%>",
11370 tag_name (tag_code),
11371 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11372 return error_mark_node;
11378 /* Lookup NAME in elaborate type specifier in scope according to
11379 SCOPE and issue diagnostics if necessary.
11380 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11381 found, and ERROR_MARK_NODE for type error. */
11384 lookup_and_check_tag (enum tag_types tag_code, tree name,
11385 tag_scope scope, bool template_header_p)
11389 if (scope == ts_global)
11391 /* First try ordinary name lookup, ignoring hidden class name
11392 injected via friend declaration. */
11393 decl = lookup_name_prefer_type (name, 2);
11394 /* If that fails, the name will be placed in the smallest
11395 non-class, non-function-prototype scope according to 3.3.1/5.
11396 We may already have a hidden name declared as friend in this
11397 scope. So lookup again but not ignoring hidden names.
11398 If we find one, that name will be made visible rather than
11399 creating a new tag. */
11401 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11404 decl = lookup_type_scope (name, scope);
11406 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11407 decl = DECL_TEMPLATE_RESULT (decl);
11409 if (decl && TREE_CODE (decl) == TYPE_DECL)
11411 /* Look for invalid nested type:
11415 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11417 error ("%qD has the same name as the class in which it is "
11420 return error_mark_node;
11423 /* Two cases we need to consider when deciding if a class
11424 template is allowed as an elaborated type specifier:
11425 1. It is a self reference to its own class.
11426 2. It comes with a template header.
11430 template <class T> class C {
11431 class C *c1; // DECL_SELF_REFERENCE_P is true
11434 template <class U> class C; // template_header_p is true
11435 template <class T> class C<T>::D {
11436 class C *c2; // DECL_SELF_REFERENCE_P is true
11439 t = check_elaborated_type_specifier (tag_code,
11442 | DECL_SELF_REFERENCE_P (decl));
11445 else if (decl && TREE_CODE (decl) == TREE_LIST)
11447 error ("reference to %qD is ambiguous", name);
11448 print_candidates (decl);
11449 return error_mark_node;
11455 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11456 Define the tag as a forward-reference if it is not defined.
11458 If a declaration is given, process it here, and report an error if
11459 multiple declarations are not identical.
11461 SCOPE is TS_CURRENT when this is also a definition. Only look in
11462 the current frame for the name (since C++ allows new names in any
11463 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11464 declaration. Only look beginning from the current scope outward up
11465 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11467 TEMPLATE_HEADER_P is true when this declaration is preceded by
11468 a set of template parameters. */
11471 xref_tag_1 (enum tag_types tag_code, tree name,
11472 tag_scope scope, bool template_header_p)
11474 enum tree_code code;
11476 tree context = NULL_TREE;
11478 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11484 code = RECORD_TYPE;
11490 code = ENUMERAL_TYPE;
11493 gcc_unreachable ();
11496 /* In case of anonymous name, xref_tag is only called to
11497 make type node and push name. Name lookup is not required. */
11498 if (ANON_AGGRNAME_P (name))
11501 t = lookup_and_check_tag (tag_code, name,
11502 scope, template_header_p);
11504 if (t == error_mark_node)
11505 return error_mark_node;
11507 if (scope != ts_current && t && current_class_type
11508 && template_class_depth (current_class_type)
11509 && template_header_p)
11511 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11512 definition of this tag. Since, in addition, we are currently
11513 processing a (member) template declaration of a template
11514 class, we must be very careful; consider:
11521 { template <class V>
11522 friend struct S1; };
11524 Here, the S2::S1 declaration should not be confused with the
11525 outer declaration. In particular, the inner version should
11526 have a template parameter of level 2, not level 1. This
11527 would be particularly important if the member declaration
11530 template <class V = U> friend struct S1;
11532 say, when we should tsubst into `U' when instantiating
11533 S2. On the other hand, when presented with:
11543 we must find the inner binding eventually. We
11544 accomplish this by making sure that the new type we
11545 create to represent this declaration has the right
11547 context = TYPE_CONTEXT (t);
11553 /* If no such tag is yet defined, create a forward-reference node
11554 and record it as the "definition".
11555 When a real declaration of this type is found,
11556 the forward-reference will be altered into a real type. */
11557 if (code == ENUMERAL_TYPE)
11559 error ("use of enum %q#D without previous declaration", name);
11560 return error_mark_node;
11564 t = make_class_type (code);
11565 TYPE_CONTEXT (t) = context;
11566 t = pushtag (name, t, scope);
11571 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11573 if (!redeclare_class_template (t, current_template_parms))
11574 return error_mark_node;
11576 else if (!processing_template_decl
11577 && CLASS_TYPE_P (t)
11578 && CLASSTYPE_IS_TEMPLATE (t))
11580 error ("redeclaration of %qT as a non-template", t);
11581 error ("previous declaration %q+D", t);
11582 return error_mark_node;
11585 /* Make injected friend class visible. */
11586 if (scope != ts_within_enclosing_non_class
11587 && hidden_name_p (TYPE_NAME (t)))
11589 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11590 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11592 if (TYPE_TEMPLATE_INFO (t))
11594 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11595 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11603 /* Wrapper for xref_tag_1. */
11606 xref_tag (enum tag_types tag_code, tree name,
11607 tag_scope scope, bool template_header_p)
11611 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11612 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11613 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11619 xref_tag_from_type (tree old, tree id, tag_scope scope)
11621 enum tag_types tag_kind;
11623 if (TREE_CODE (old) == RECORD_TYPE)
11624 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11626 tag_kind = union_type;
11628 if (id == NULL_TREE)
11629 id = TYPE_IDENTIFIER (old);
11631 return xref_tag (tag_kind, id, scope, false);
11634 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11635 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11636 access_* node, and the TREE_VALUE is the type of the base-class.
11637 Non-NULL TREE_TYPE indicates virtual inheritance.
11639 Returns true if the binfo hierarchy was successfully created,
11640 false if an error was detected. */
11643 xref_basetypes (tree ref, tree base_list)
11646 tree binfo, base_binfo;
11647 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11648 unsigned max_bases = 0; /* Maximum direct bases. */
11650 tree default_access;
11651 tree igo_prev; /* Track Inheritance Graph Order. */
11653 if (ref == error_mark_node)
11656 /* The base of a derived class is private by default, all others are
11658 default_access = (TREE_CODE (ref) == RECORD_TYPE
11659 && CLASSTYPE_DECLARED_CLASS (ref)
11660 ? access_private_node : access_public_node);
11662 /* First, make sure that any templates in base-classes are
11663 instantiated. This ensures that if we call ourselves recursively
11664 we do not get confused about which classes are marked and which
11666 basep = &base_list;
11669 tree basetype = TREE_VALUE (*basep);
11671 if (!(processing_template_decl && uses_template_parms (basetype))
11672 && !complete_type_or_else (basetype, NULL))
11673 /* An incomplete type. Remove it from the list. */
11674 *basep = TREE_CHAIN (*basep);
11678 if (TREE_TYPE (*basep))
11680 if (CLASS_TYPE_P (basetype))
11681 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11682 basep = &TREE_CHAIN (*basep);
11686 TYPE_MARKED_P (ref) = 1;
11688 /* The binfo slot should be empty, unless this is an (ill-formed)
11690 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11692 error ("redefinition of %q#T", ref);
11696 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11698 binfo = make_tree_binfo (max_bases);
11700 TYPE_BINFO (ref) = binfo;
11701 BINFO_OFFSET (binfo) = size_zero_node;
11702 BINFO_TYPE (binfo) = ref;
11704 /* Apply base-class info set up to the variants of this type. */
11705 fixup_type_variants (ref);
11709 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11710 /* An aggregate cannot have baseclasses. */
11711 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11713 if (TREE_CODE (ref) == UNION_TYPE)
11715 error ("derived union %qT invalid", ref);
11722 if (TYPE_FOR_JAVA (ref))
11724 error ("Java class %qT cannot have multiple bases", ref);
11731 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11733 if (TYPE_FOR_JAVA (ref))
11735 error ("Java class %qT cannot have virtual bases", ref);
11740 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11742 tree access = TREE_PURPOSE (base_list);
11743 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11744 tree basetype = TREE_VALUE (base_list);
11746 if (access == access_default_node)
11747 access = default_access;
11749 if (PACK_EXPANSION_P (basetype))
11750 basetype = PACK_EXPANSION_PATTERN (basetype);
11751 if (TREE_CODE (basetype) == TYPE_DECL)
11752 basetype = TREE_TYPE (basetype);
11753 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11755 error ("base type %qT fails to be a struct or class type",
11760 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11761 TYPE_FOR_JAVA (ref) = 1;
11763 base_binfo = NULL_TREE;
11764 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11766 base_binfo = TYPE_BINFO (basetype);
11767 /* The original basetype could have been a typedef'd type. */
11768 basetype = BINFO_TYPE (base_binfo);
11770 /* Inherit flags from the base. */
11771 TYPE_HAS_NEW_OPERATOR (ref)
11772 |= TYPE_HAS_NEW_OPERATOR (basetype);
11773 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11774 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11775 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11776 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11777 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11778 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11779 CLASSTYPE_REPEATED_BASE_P (ref)
11780 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11783 /* We must do this test after we've seen through a typedef
11785 if (TYPE_MARKED_P (basetype))
11787 if (basetype == ref)
11788 error ("recursive type %qT undefined", basetype);
11790 error ("duplicate base type %qT invalid", basetype);
11794 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11795 /* Regenerate the pack expansion for the bases. */
11796 basetype = make_pack_expansion (basetype);
11798 TYPE_MARKED_P (basetype) = 1;
11800 base_binfo = copy_binfo (base_binfo, basetype, ref,
11801 &igo_prev, via_virtual);
11802 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11803 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11805 BINFO_BASE_APPEND (binfo, base_binfo);
11806 BINFO_BASE_ACCESS_APPEND (binfo, access);
11809 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11810 /* If we have space in the vbase vector, we must have shared at
11811 least one of them, and are therefore diamond shaped. */
11812 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11814 /* Unmark all the types. */
11815 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11816 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11817 TYPE_MARKED_P (ref) = 0;
11819 /* Now see if we have a repeated base type. */
11820 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11822 for (base_binfo = binfo; base_binfo;
11823 base_binfo = TREE_CHAIN (base_binfo))
11825 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11827 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11830 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11832 for (base_binfo = binfo; base_binfo;
11833 base_binfo = TREE_CHAIN (base_binfo))
11834 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11835 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11844 /* Copies the enum-related properties from type SRC to type DST.
11845 Used with the underlying type of an enum and the enum itself. */
11847 copy_type_enum (tree dst, tree src)
11849 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11850 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11851 TYPE_SIZE (dst) = TYPE_SIZE (src);
11852 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11853 SET_TYPE_MODE (dst, TYPE_MODE (src));
11854 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11855 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11856 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11857 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11860 /* Begin compiling the definition of an enumeration type.
11863 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11865 UNDERLYING_TYPE is the type that will be used as the storage for
11866 the enumeration type. This should be NULL_TREE if no storage type
11869 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11871 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11873 Returns the type object, as yet incomplete.
11874 Also records info about it so that build_enumerator
11875 may be used to declare the individual values as they are read. */
11878 start_enum (tree name, tree enumtype, tree underlying_type,
11879 bool scoped_enum_p, bool *is_new)
11881 tree prevtype = NULL_TREE;
11882 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11886 /* [C++0x dcl.enum]p5:
11888 If not explicitly specified, the underlying type of a scoped
11889 enumeration type is int. */
11890 if (!underlying_type && scoped_enum_p)
11891 underlying_type = integer_type_node;
11893 if (underlying_type)
11894 underlying_type = cv_unqualified (underlying_type);
11896 /* If this is the real definition for a previous forward reference,
11897 fill in the contents in the same object that used to be the
11898 forward reference. */
11900 enumtype = lookup_and_check_tag (enum_type, name,
11901 /*tag_scope=*/ts_current,
11902 /*template_header_p=*/false);
11904 /* In case of a template_decl, the only check that should be deferred
11905 to instantiation time is the comparison of underlying types. */
11906 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11908 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11910 error_at (input_location, "scoped/unscoped mismatch "
11911 "in enum %q#T", enumtype);
11912 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11913 "previous definition here");
11914 enumtype = error_mark_node;
11916 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11918 error_at (input_location, "underlying type mismatch "
11919 "in enum %q#T", enumtype);
11920 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11921 "previous definition here");
11922 enumtype = error_mark_node;
11924 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11925 && !dependent_type_p (underlying_type)
11926 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11927 && !same_type_p (underlying_type,
11928 ENUM_UNDERLYING_TYPE (enumtype)))
11930 error_at (input_location, "different underlying type "
11931 "in enum %q#T", enumtype);
11932 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11933 "previous definition here");
11934 underlying_type = NULL_TREE;
11938 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11939 || processing_template_decl)
11941 /* In case of error, make a dummy enum to allow parsing to
11943 if (enumtype == error_mark_node)
11945 name = make_anon_name ();
11946 enumtype = NULL_TREE;
11949 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11950 of an opaque enum, or an opaque enum of an already defined
11951 enumeration (C++0x only).
11952 In any other case, it'll be NULL_TREE. */
11958 prevtype = enumtype;
11959 enumtype = cxx_make_type (ENUMERAL_TYPE);
11960 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11961 if (enumtype == error_mark_node)
11962 return error_mark_node;
11964 /* The enum is considered opaque until the opening '{' of the
11965 enumerator list. */
11966 SET_OPAQUE_ENUM_P (enumtype, true);
11967 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11970 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11972 if (underlying_type)
11974 if (CP_INTEGRAL_TYPE_P (underlying_type))
11976 copy_type_enum (enumtype, underlying_type);
11977 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11979 else if (dependent_type_p (underlying_type))
11980 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11982 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11983 underlying_type, enumtype);
11986 /* If into a template class, the returned enum is always the first
11987 declaration (opaque or not) seen. This way all the references to
11988 this type will be to the same declaration. The following ones are used
11989 only to check for definition errors. */
11990 if (prevtype && processing_template_decl)
11996 /* After processing and defining all the values of an enumeration type,
11997 install their decls in the enumeration type.
11998 ENUMTYPE is the type object. */
12001 finish_enum_value_list (tree enumtype)
12004 tree underlying_type;
12007 tree minnode, maxnode;
12010 bool fixed_underlying_type_p
12011 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12013 /* We built up the VALUES in reverse order. */
12014 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12016 /* For an enum defined in a template, just set the type of the values;
12017 all further processing is postponed until the template is
12018 instantiated. We need to set the type so that tsubst of a CONST_DECL
12020 if (processing_template_decl)
12022 for (values = TYPE_VALUES (enumtype);
12024 values = TREE_CHAIN (values))
12025 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12029 /* Determine the minimum and maximum values of the enumerators. */
12030 if (TYPE_VALUES (enumtype))
12032 minnode = maxnode = NULL_TREE;
12034 for (values = TYPE_VALUES (enumtype);
12036 values = TREE_CHAIN (values))
12038 decl = TREE_VALUE (values);
12040 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12041 each enumerator has the type of its enumeration. Prior to the
12042 closing brace, the type of each enumerator is the type of its
12043 initializing value. */
12044 TREE_TYPE (decl) = enumtype;
12046 /* Update the minimum and maximum values, if appropriate. */
12047 value = DECL_INITIAL (decl);
12048 if (value == error_mark_node)
12049 value = integer_zero_node;
12050 /* Figure out what the minimum and maximum values of the
12051 enumerators are. */
12053 minnode = maxnode = value;
12054 else if (tree_int_cst_lt (maxnode, value))
12056 else if (tree_int_cst_lt (value, minnode))
12063 If the enumerator-list is empty, the underlying type is as if
12064 the enumeration had a single enumerator with value 0. */
12065 minnode = maxnode = integer_zero_node;
12067 if (!fixed_underlying_type_p)
12069 /* Compute the number of bits require to represent all values of the
12070 enumeration. We must do this before the type of MINNODE and
12071 MAXNODE are transformed, since tree_int_cst_min_precision relies
12072 on the TREE_TYPE of the value it is passed. */
12073 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12074 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12075 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12076 int precision = MAX (lowprec, highprec);
12078 bool use_short_enum;
12080 /* Determine the underlying type of the enumeration.
12084 The underlying type of an enumeration is an integral type that
12085 can represent all the enumerator values defined in the
12086 enumeration. It is implementation-defined which integral type is
12087 used as the underlying type for an enumeration except that the
12088 underlying type shall not be larger than int unless the value of
12089 an enumerator cannot fit in an int or unsigned int.
12091 We use "int" or an "unsigned int" as the underlying type, even if
12092 a smaller integral type would work, unless the user has
12093 explicitly requested that we use the smallest possible type. The
12094 user can request that for all enumerations with a command line
12095 flag, or for just one enumeration with an attribute. */
12097 use_short_enum = flag_short_enums
12098 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12100 for (itk = (use_short_enum ? itk_char : itk_int);
12104 underlying_type = integer_types[itk];
12105 if (underlying_type != NULL_TREE
12106 && TYPE_PRECISION (underlying_type) >= precision
12107 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12110 if (itk == itk_none)
12114 IF no integral type can represent all the enumerator values, the
12115 enumeration is ill-formed. */
12116 error ("no integral type can represent all of the enumerator values "
12117 "for %qT", enumtype);
12118 precision = TYPE_PRECISION (long_long_integer_type_node);
12119 underlying_type = integer_types[itk_unsigned_long_long];
12124 The value of sizeof() applied to an enumeration type, an object
12125 of an enumeration type, or an enumerator, is the value of sizeof()
12126 applied to the underlying type. */
12127 copy_type_enum (enumtype, underlying_type);
12129 /* Compute the minimum and maximum values for the type.
12133 For an enumeration where emin is the smallest enumerator and emax
12134 is the largest, the values of the enumeration are the values of the
12135 underlying type in the range bmin to bmax, where bmin and bmax are,
12136 respectively, the smallest and largest values of the smallest bit-
12137 field that can store emin and emax. */
12139 /* The middle-end currently assumes that types with TYPE_PRECISION
12140 narrower than their underlying type are suitably zero or sign
12141 extended to fill their mode. Similarly, it assumes that the front
12142 end assures that a value of a particular type must be within
12143 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12145 We used to set these fields based on bmin and bmax, but that led
12146 to invalid assumptions like optimizing away bounds checking. So
12147 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12148 TYPE_MAX_VALUE to the values for the mode above and only restrict
12149 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12150 ENUM_UNDERLYING_TYPE (enumtype)
12151 = build_distinct_type_copy (underlying_type);
12152 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12153 set_min_and_max_values_for_integral_type
12154 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12156 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12157 if (flag_strict_enums)
12158 set_min_and_max_values_for_integral_type (enumtype, precision,
12162 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12164 /* Convert each of the enumerators to the type of the underlying
12165 type of the enumeration. */
12166 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12168 location_t saved_location;
12170 decl = TREE_VALUE (values);
12171 saved_location = input_location;
12172 input_location = DECL_SOURCE_LOCATION (decl);
12173 if (fixed_underlying_type_p)
12174 /* If the enumeration type has a fixed underlying type, we
12175 already checked all of the enumerator values. */
12176 value = DECL_INITIAL (decl);
12178 value = perform_implicit_conversion (underlying_type,
12179 DECL_INITIAL (decl),
12180 tf_warning_or_error);
12181 input_location = saved_location;
12183 /* Do not clobber shared ints. */
12184 value = copy_node (value);
12186 TREE_TYPE (value) = enumtype;
12187 DECL_INITIAL (decl) = value;
12190 /* Fix up all variant types of this enum type. */
12191 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12192 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12194 /* Finish debugging output for this type. */
12195 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12198 /* Finishes the enum type. This is called only the first time an
12199 enumeration is seen, be it opaque or odinary.
12200 ENUMTYPE is the type object. */
12203 finish_enum (tree enumtype)
12205 if (processing_template_decl)
12207 if (at_function_scope_p ())
12208 add_stmt (build_min (TAG_DEFN, enumtype));
12212 /* Here there should not be any variants of this type. */
12213 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12214 && !TYPE_NEXT_VARIANT (enumtype));
12217 /* Build and install a CONST_DECL for an enumeration constant of the
12218 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12219 LOC is the location of NAME.
12220 Assignment of sequential values by default is handled here. */
12223 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12229 /* If the VALUE was erroneous, pretend it wasn't there; that will
12230 result in the enum being assigned the next value in sequence. */
12231 if (value == error_mark_node)
12234 /* Remove no-op casts from the value. */
12236 STRIP_TYPE_NOPS (value);
12238 if (! processing_template_decl)
12240 /* Validate and default VALUE. */
12241 if (value != NULL_TREE)
12243 value = cxx_constant_value (value);
12245 if (TREE_CODE (value) == INTEGER_CST
12246 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12248 value = perform_integral_promotions (value);
12252 error ("enumerator value for %qD is not an integer constant", name);
12257 /* Default based on previous value. */
12258 if (value == NULL_TREE)
12260 if (TYPE_VALUES (enumtype))
12263 unsigned HOST_WIDE_INT lo;
12267 /* C++03 7.2/4: If no initializer is specified for the first
12268 enumerator, the type is an unspecified integral
12269 type. Otherwise the type is the same as the type of the
12270 initializing value of the preceding enumerator unless the
12271 incremented value is not representable in that type, in
12272 which case the type is an unspecified integral type
12273 sufficient to contain the incremented value. */
12274 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12275 if (error_operand_p (prev_value))
12276 value = error_mark_node;
12279 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12280 TREE_INT_CST_HIGH (prev_value),
12285 tree type = TREE_TYPE (prev_value);
12286 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12287 di.low = lo; di.high = hi;
12288 if (!double_int_fits_to_tree_p (type, di))
12291 for (itk = itk_int; itk != itk_none; itk++)
12293 type = integer_types[itk];
12294 if (type != NULL_TREE
12295 && (pos || !TYPE_UNSIGNED (type))
12296 && double_int_fits_to_tree_p (type, di))
12299 if (type && cxx_dialect < cxx0x
12300 && itk > itk_unsigned_long)
12301 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12302 incremented enumerator value is too large for %<unsigned long%>" : "\
12303 incremented enumerator value is too large for %<long%>");
12305 if (type == NULL_TREE)
12308 value = double_int_to_tree (type, di);
12313 error ("overflow in enumeration values at %qD", name);
12314 value = error_mark_node;
12319 value = integer_zero_node;
12322 /* Remove no-op casts from the value. */
12323 STRIP_TYPE_NOPS (value);
12325 /* If the underlying type of the enum is fixed, check whether
12326 the enumerator values fits in the underlying type. If it
12327 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12328 if (ENUM_UNDERLYING_TYPE (enumtype)
12330 && TREE_CODE (value) == INTEGER_CST
12331 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12333 error ("enumerator value %E is too large for underlying type %<%T%>",
12334 value, ENUM_UNDERLYING_TYPE (enumtype));
12336 /* Silently convert the value so that we can continue. */
12337 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12342 /* C++ associates enums with global, function, or class declarations. */
12343 context = current_scope ();
12345 /* Build the actual enumeration constant. Note that the enumeration
12346 constants have the underlying type of the enum (if it is fixed)
12347 or the type of their initializer (if the underlying type of the
12348 enum is not fixed):
12352 If the underlying type is fixed, the type of each enumerator
12353 prior to the closing brace is the underlying type; if the
12354 initializing value of an enumerator cannot be represented by
12355 the underlying type, the program is ill-formed. If the
12356 underlying type is not fixed, the type of each enumerator is
12357 the type of its initializing value.
12359 If the underlying type is not fixed, it will be computed by
12360 finish_enum and we will reset the type of this enumerator. Of
12361 course, if we're processing a template, there may be no value. */
12362 type = value ? TREE_TYPE (value) : NULL_TREE;
12364 if (context && context == current_class_type)
12365 /* This enum declaration is local to the class. We need the full
12366 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12367 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12369 /* It's a global enum, or it's local to a function. (Note local to
12370 a function could mean local to a class method. */
12371 decl = build_decl (loc, CONST_DECL, name, type);
12373 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12374 TREE_CONSTANT (decl) = 1;
12375 TREE_READONLY (decl) = 1;
12376 DECL_INITIAL (decl) = value;
12378 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12379 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12380 on the TYPE_FIELDS list for `S'. (That's so that you can say
12381 things like `S::i' later.) */
12382 finish_member_declaration (decl);
12386 /* Add this enumeration constant to the list for this type. */
12387 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12390 /* Look for an enumerator with the given NAME within the enumeration
12391 type ENUMTYPE. This routine is used primarily for qualified name
12392 lookup into an enumerator in C++0x, e.g.,
12394 enum class Color { Red, Green, Blue };
12396 Color color = Color::Red;
12398 Returns the value corresponding to the enumerator, or
12399 NULL_TREE if no such enumerator was found. */
12401 lookup_enumerator (tree enumtype, tree name)
12404 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12406 e = purpose_member (name, TYPE_VALUES (enumtype));
12407 return e? TREE_VALUE (e) : NULL_TREE;
12411 /* We're defining DECL. Make sure that its type is OK. */
12414 check_function_type (tree decl, tree current_function_parms)
12416 tree fntype = TREE_TYPE (decl);
12417 tree return_type = complete_type (TREE_TYPE (fntype));
12419 /* In a function definition, arg types must be complete. */
12420 require_complete_types_for_parms (current_function_parms);
12422 if (dependent_type_p (return_type))
12424 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12425 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12427 tree args = TYPE_ARG_TYPES (fntype);
12429 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12430 error ("return type %q#T is incomplete", return_type);
12432 error ("return type has Java class type %q#T", return_type);
12434 /* Make it return void instead. */
12435 if (TREE_CODE (fntype) == METHOD_TYPE)
12436 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12438 TREE_CHAIN (args));
12440 fntype = build_function_type (void_type_node, args);
12442 = build_exception_variant (fntype,
12443 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12444 fntype = (cp_build_type_attribute_variant
12445 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12446 TREE_TYPE (decl) = fntype;
12449 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12452 /* Create the FUNCTION_DECL for a function definition.
12453 DECLSPECS and DECLARATOR are the parts of the declaration;
12454 they describe the function's name and the type it returns,
12455 but twisted together in a fashion that parallels the syntax of C.
12457 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12458 DECLARATOR is really the DECL for the function we are about to
12459 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12460 indicating that the function is an inline defined in-class.
12462 This function creates a binding context for the function body
12463 as well as setting up the FUNCTION_DECL in current_function_decl.
12465 For C++, we must first check whether that datum makes any sense.
12466 For example, "class A local_a(1,2);" means that variable local_a
12467 is an aggregate of type A, which should have a constructor
12468 applied to it with the argument list [1, 2].
12470 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12471 or may be a BLOCK if the function has been defined previously
12472 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12473 error_mark_node if the function has never been defined, or
12474 a BLOCK if the function has been defined somewhere. */
12477 start_preparsed_function (tree decl1, tree attrs, int flags)
12479 tree ctype = NULL_TREE;
12482 int doing_friend = 0;
12483 cp_binding_level *bl;
12484 tree current_function_parms;
12485 struct c_fileinfo *finfo
12486 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12487 bool honor_interface;
12489 /* Sanity check. */
12490 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12491 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12493 fntype = TREE_TYPE (decl1);
12494 if (TREE_CODE (fntype) == METHOD_TYPE)
12495 ctype = TYPE_METHOD_BASETYPE (fntype);
12497 /* ISO C++ 11.4/5. A friend function defined in a class is in
12498 the (lexical) scope of the class in which it is defined. */
12499 if (!ctype && DECL_FRIEND_P (decl1))
12501 ctype = DECL_FRIEND_CONTEXT (decl1);
12503 /* CTYPE could be null here if we're dealing with a template;
12504 for example, `inline friend float foo()' inside a template
12505 will have no CTYPE set. */
12506 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12512 if (DECL_DECLARED_INLINE_P (decl1)
12513 && lookup_attribute ("noinline", attrs))
12514 warning (0, "inline function %q+D given attribute noinline", decl1);
12516 /* Handle gnu_inline attribute. */
12517 if (GNU_INLINE_P (decl1))
12519 DECL_EXTERNAL (decl1) = 1;
12520 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12521 DECL_INTERFACE_KNOWN (decl1) = 1;
12522 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12525 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12526 /* This is a constructor, we must ensure that any default args
12527 introduced by this definition are propagated to the clones
12528 now. The clones are used directly in overload resolution. */
12529 adjust_clone_args (decl1);
12531 /* Sometimes we don't notice that a function is a static member, and
12532 build a METHOD_TYPE for it. Fix that up now. */
12533 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12534 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12536 /* Set up current_class_type, and enter the scope of the class, if
12539 push_nested_class (ctype);
12540 else if (DECL_STATIC_FUNCTION_P (decl1))
12541 push_nested_class (DECL_CONTEXT (decl1));
12543 /* Now that we have entered the scope of the class, we must restore
12544 the bindings for any template parameters surrounding DECL1, if it
12545 is an inline member template. (Order is important; consider the
12546 case where a template parameter has the same name as a field of
12547 the class.) It is not until after this point that
12548 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12549 if (flags & SF_INCLASS_INLINE)
12550 maybe_begin_member_template_processing (decl1);
12552 /* Effective C++ rule 15. */
12554 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12555 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12556 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12558 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12559 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12560 if (!DECL_INITIAL (decl1))
12561 DECL_INITIAL (decl1) = error_mark_node;
12563 /* This function exists in static storage.
12564 (This does not mean `static' in the C sense!) */
12565 TREE_STATIC (decl1) = 1;
12567 /* We must call push_template_decl after current_class_type is set
12568 up. (If we are processing inline definitions after exiting a
12569 class scope, current_class_type will be NULL_TREE until set above
12570 by push_nested_class.) */
12571 if (processing_template_decl)
12573 /* FIXME: Handle error_mark_node more gracefully. */
12574 tree newdecl1 = push_template_decl (decl1);
12575 if (newdecl1 != error_mark_node)
12579 /* We are now in the scope of the function being defined. */
12580 current_function_decl = decl1;
12582 /* Save the parm names or decls from this function's declarator
12583 where store_parm_decls will find them. */
12584 current_function_parms = DECL_ARGUMENTS (decl1);
12586 /* Make sure the parameter and return types are reasonable. When
12587 you declare a function, these types can be incomplete, but they
12588 must be complete when you define the function. */
12589 check_function_type (decl1, current_function_parms);
12591 /* Build the return declaration for the function. */
12592 restype = TREE_TYPE (fntype);
12593 if (DECL_RESULT (decl1) == NULL_TREE)
12597 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12598 DECL_ARTIFICIAL (resdecl) = 1;
12599 DECL_IGNORED_P (resdecl) = 1;
12600 DECL_RESULT (decl1) = resdecl;
12602 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12605 /* Let the user know we're compiling this function. */
12606 announce_function (decl1);
12608 /* Record the decl so that the function name is defined.
12609 If we already have a decl for this name, and it is a FUNCTION_DECL,
12610 use the old decl. */
12611 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12613 /* A specialization is not used to guide overload resolution. */
12614 if (!DECL_FUNCTION_MEMBER_P (decl1)
12615 && !(DECL_USE_TEMPLATE (decl1) &&
12616 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12618 tree olddecl = pushdecl (decl1);
12620 if (olddecl == error_mark_node)
12621 /* If something went wrong when registering the declaration,
12622 use DECL1; we have to have a FUNCTION_DECL to use when
12623 parsing the body of the function. */
12627 /* Otherwise, OLDDECL is either a previous declaration
12628 of the same function or DECL1 itself. */
12630 if (warn_missing_declarations
12631 && olddecl == decl1
12632 && !DECL_MAIN_P (decl1)
12633 && TREE_PUBLIC (decl1)
12634 && !DECL_DECLARED_INLINE_P (decl1))
12638 /* Check whether DECL1 is in an anonymous
12640 for (context = DECL_CONTEXT (decl1);
12642 context = DECL_CONTEXT (context))
12644 if (TREE_CODE (context) == NAMESPACE_DECL
12645 && DECL_NAME (context) == NULL_TREE)
12649 if (context == NULL)
12650 warning (OPT_Wmissing_declarations,
12651 "no previous declaration for %q+D", decl1);
12659 /* We need to set the DECL_CONTEXT. */
12660 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12661 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12663 fntype = TREE_TYPE (decl1);
12665 /* If #pragma weak applies, mark the decl appropriately now.
12666 The pragma only applies to global functions. Because
12667 determining whether or not the #pragma applies involves
12668 computing the mangled name for the declaration, we cannot
12669 apply the pragma until after we have merged this declaration
12670 with any previous declarations; if the original declaration
12671 has a linkage specification, that specification applies to
12672 the definition as well, and may affect the mangled name. */
12673 if (DECL_FILE_SCOPE_P (decl1))
12674 maybe_apply_pragma_weak (decl1);
12677 /* Reset this in case the call to pushdecl changed it. */
12678 current_function_decl = decl1;
12680 gcc_assert (DECL_INITIAL (decl1));
12682 /* This function may already have been parsed, in which case just
12683 return; our caller will skip over the body without parsing. */
12684 if (DECL_INITIAL (decl1) != error_mark_node)
12687 /* Initialize RTL machinery. We cannot do this until
12688 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12689 even when processing a template; this is how we get
12690 CFUN set up, and our per-function variables initialized.
12691 FIXME factor out the non-RTL stuff. */
12692 bl = current_binding_level;
12693 allocate_struct_function (decl1, processing_template_decl);
12695 /* Initialize the language data structures. Whenever we start
12696 a new function, we destroy temporaries in the usual way. */
12697 cfun->language = ggc_alloc_cleared_language_function ();
12698 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12699 current_binding_level = bl;
12701 /* Start the statement-tree, start the tree now. */
12702 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12704 /* If we are (erroneously) defining a function that we have already
12705 defined before, wipe out what we knew before. */
12706 if (!DECL_PENDING_INLINE_P (decl1))
12707 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12709 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12711 /* We know that this was set up by `grokclassfn'. We do not
12712 wait until `store_parm_decls', since evil parse errors may
12713 never get us to that point. Here we keep the consistency
12714 between `current_class_type' and `current_class_ptr'. */
12715 tree t = DECL_ARGUMENTS (decl1);
12717 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12718 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12720 cp_function_chain->x_current_class_ref
12721 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12722 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12723 cp_function_chain->x_current_class_ptr = t;
12725 /* Constructors and destructors need to know whether they're "in
12726 charge" of initializing virtual base classes. */
12727 t = DECL_CHAIN (t);
12728 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12730 current_in_charge_parm = t;
12731 t = DECL_CHAIN (t);
12733 if (DECL_HAS_VTT_PARM_P (decl1))
12735 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12736 current_vtt_parm = t;
12740 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12741 /* Implicitly-defined methods (like the
12742 destructor for a class in which no destructor
12743 is explicitly declared) must not be defined
12744 until their definition is needed. So, we
12745 ignore interface specifications for
12746 compiler-generated functions. */
12747 && !DECL_ARTIFICIAL (decl1));
12749 if (processing_template_decl)
12750 /* Don't mess with interface flags. */;
12751 else if (DECL_INTERFACE_KNOWN (decl1))
12753 tree ctx = decl_function_context (decl1);
12755 if (DECL_NOT_REALLY_EXTERN (decl1))
12756 DECL_EXTERNAL (decl1) = 0;
12758 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12759 && TREE_PUBLIC (ctx))
12760 /* This is a function in a local class in an extern inline
12762 comdat_linkage (decl1);
12764 /* If this function belongs to an interface, it is public.
12765 If it belongs to someone else's interface, it is also external.
12766 This only affects inlines and template instantiations. */
12767 else if (!finfo->interface_unknown && honor_interface)
12769 if (DECL_DECLARED_INLINE_P (decl1)
12770 || DECL_TEMPLATE_INSTANTIATION (decl1))
12772 DECL_EXTERNAL (decl1)
12773 = (finfo->interface_only
12774 || (DECL_DECLARED_INLINE_P (decl1)
12775 && ! flag_implement_inlines
12776 && !DECL_VINDEX (decl1)));
12778 /* For WIN32 we also want to put these in linkonce sections. */
12779 maybe_make_one_only (decl1);
12782 DECL_EXTERNAL (decl1) = 0;
12783 DECL_INTERFACE_KNOWN (decl1) = 1;
12784 /* If this function is in an interface implemented in this file,
12785 make sure that the back end knows to emit this function
12787 if (!DECL_EXTERNAL (decl1))
12788 mark_needed (decl1);
12790 else if (finfo->interface_unknown && finfo->interface_only
12791 && honor_interface)
12793 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12794 interface, we will have both finfo->interface_unknown and
12795 finfo->interface_only set. In that case, we don't want to
12796 use the normal heuristics because someone will supply a
12797 #pragma implementation elsewhere, and deducing it here would
12798 produce a conflict. */
12799 comdat_linkage (decl1);
12800 DECL_EXTERNAL (decl1) = 0;
12801 DECL_INTERFACE_KNOWN (decl1) = 1;
12802 DECL_DEFER_OUTPUT (decl1) = 1;
12806 /* This is a definition, not a reference.
12807 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12808 if (!GNU_INLINE_P (decl1))
12809 DECL_EXTERNAL (decl1) = 0;
12811 if ((DECL_DECLARED_INLINE_P (decl1)
12812 || DECL_TEMPLATE_INSTANTIATION (decl1))
12813 && ! DECL_INTERFACE_KNOWN (decl1))
12814 DECL_DEFER_OUTPUT (decl1) = 1;
12816 DECL_INTERFACE_KNOWN (decl1) = 1;
12819 /* Determine the ELF visibility attribute for the function. We must not
12820 do this before calling "pushdecl", as we must allow "duplicate_decls"
12821 to merge any attributes appropriately. We also need to wait until
12823 if (!DECL_CLONED_FUNCTION_P (decl1))
12824 determine_visibility (decl1);
12826 begin_scope (sk_function_parms, decl1);
12830 if (DECL_DESTRUCTOR_P (decl1)
12831 || (DECL_CONSTRUCTOR_P (decl1)
12832 && targetm.cxx.cdtor_returns_this ()))
12834 cdtor_label = build_decl (input_location,
12835 LABEL_DECL, NULL_TREE, NULL_TREE);
12836 DECL_CONTEXT (cdtor_label) = current_function_decl;
12839 start_fname_decls ();
12841 store_parm_decls (current_function_parms);
12845 /* Like start_preparsed_function, except that instead of a
12846 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12848 Returns 1 on success. If the DECLARATOR is not suitable for a function
12849 (it defines a datum instead), we return 0, which tells
12850 yyparse to report a parse error. */
12853 start_function (cp_decl_specifier_seq *declspecs,
12854 const cp_declarator *declarator,
12859 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12860 if (decl1 == error_mark_node)
12862 /* If the declarator is not suitable for a function definition,
12863 cause a syntax error. */
12864 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12866 error ("invalid function declaration");
12870 if (DECL_MAIN_P (decl1))
12871 /* main must return int. grokfndecl should have corrected it
12872 (and issued a diagnostic) if the user got it wrong. */
12873 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12874 integer_type_node));
12876 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12881 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12885 use_eh_spec_block (tree fn)
12887 return (flag_exceptions && flag_enforce_eh_specs
12888 && !processing_template_decl
12889 && !type_throw_all_p (TREE_TYPE (fn))
12890 /* We insert the EH_SPEC_BLOCK only in the original
12891 function; then, it is copied automatically to the
12893 && !DECL_CLONED_FUNCTION_P (fn)
12894 /* Implicitly-generated constructors and destructors have
12895 exception specifications. However, those specifications
12896 are the union of the possible exceptions specified by the
12897 constructors/destructors for bases and members, so no
12898 unallowed exception will ever reach this function. By
12899 not creating the EH_SPEC_BLOCK we save a little memory,
12900 and we avoid spurious warnings about unreachable
12902 && !DECL_DEFAULTED_FN (fn));
12905 /* Store the parameter declarations into the current function declaration.
12906 This is called after parsing the parameter declarations, before
12907 digesting the body of the function.
12909 Also install to binding contour return value identifier, if any. */
12912 store_parm_decls (tree current_function_parms)
12914 tree fndecl = current_function_decl;
12917 /* This is a chain of any other decls that came in among the parm
12918 declarations. If a parm is declared with enum {foo, bar} x;
12919 then CONST_DECLs for foo and bar are put here. */
12920 tree nonparms = NULL_TREE;
12922 if (current_function_parms)
12924 /* This case is when the function was defined with an ANSI prototype.
12925 The parms already have decls, so we need not do anything here
12926 except record them as in effect
12927 and complain if any redundant old-style parm decls were written. */
12929 tree specparms = current_function_parms;
12932 /* Must clear this because it might contain TYPE_DECLs declared
12934 current_binding_level->names = NULL;
12936 /* If we're doing semantic analysis, then we'll call pushdecl
12937 for each of these. We must do them in reverse order so that
12938 they end in the correct forward order. */
12939 specparms = nreverse (specparms);
12941 for (parm = specparms; parm; parm = next)
12943 next = DECL_CHAIN (parm);
12944 if (TREE_CODE (parm) == PARM_DECL)
12946 if (DECL_NAME (parm) == NULL_TREE
12947 || TREE_CODE (parm) != VOID_TYPE)
12950 error ("parameter %qD declared void", parm);
12954 /* If we find an enum constant or a type tag,
12955 put it aside for the moment. */
12956 TREE_CHAIN (parm) = NULL_TREE;
12957 nonparms = chainon (nonparms, parm);
12961 /* Get the decls in their original chain order and record in the
12962 function. This is all and only the PARM_DECLs that were
12963 pushed into scope by the loop above. */
12964 DECL_ARGUMENTS (fndecl) = getdecls ();
12967 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12969 /* Now store the final chain of decls for the arguments
12970 as the decl-chain of the current lexical scope.
12971 Put the enumerators in as well, at the front so that
12972 DECL_ARGUMENTS is not modified. */
12973 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12975 if (use_eh_spec_block (current_function_decl))
12976 current_eh_spec_block = begin_eh_spec_block ();
12980 /* We have finished doing semantic analysis on DECL, but have not yet
12981 generated RTL for its body. Save away our current state, so that
12982 when we want to generate RTL later we know what to do. */
12985 save_function_data (tree decl)
12987 struct language_function *f;
12989 /* Save the language-specific per-function data so that we can
12990 get it back when we really expand this function. */
12991 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12994 f = ggc_alloc_language_function ();
12995 memcpy (f, cp_function_chain, sizeof (struct language_function));
12996 DECL_SAVED_FUNCTION_DATA (decl) = f;
12998 /* Clear out the bits we don't need. */
12999 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13000 f->bindings = NULL;
13001 f->x_local_names = NULL;
13005 /* Set the return value of the constructor (if present). */
13008 finish_constructor_body (void)
13013 if (targetm.cxx.cdtor_returns_this ()
13014 && (! TYPE_FOR_JAVA (current_class_type)))
13016 /* Any return from a constructor will end up here. */
13017 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13019 val = DECL_ARGUMENTS (current_function_decl);
13020 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13021 DECL_RESULT (current_function_decl), val);
13022 /* Return the address of the object. */
13023 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13024 add_stmt (exprstmt);
13028 /* Do all the processing for the beginning of a destructor; set up the
13029 vtable pointers and cleanups for bases and members. */
13032 begin_destructor_body (void)
13034 tree compound_stmt;
13036 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13037 issued an error message. We still want to try to process the
13038 body of the function, but initialize_vtbl_ptrs will crash if
13039 TYPE_BINFO is NULL. */
13040 if (COMPLETE_TYPE_P (current_class_type))
13042 compound_stmt = begin_compound_stmt (0);
13043 /* Make all virtual function table pointers in non-virtual base
13044 classes point to CURRENT_CLASS_TYPE's virtual function
13046 initialize_vtbl_ptrs (current_class_ptr);
13047 finish_compound_stmt (compound_stmt);
13049 /* And insert cleanups for our bases and members so that they
13050 will be properly destroyed if we throw. */
13051 push_base_cleanups ();
13055 /* At the end of every destructor we generate code to delete the object if
13056 necessary. Do that now. */
13059 finish_destructor_body (void)
13063 /* Any return from a destructor will end up here; that way all base
13064 and member cleanups will be run when the function returns. */
13065 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13067 /* In a virtual destructor, we must call delete. */
13068 if (DECL_VIRTUAL_P (current_function_decl))
13071 tree virtual_size = cxx_sizeof (current_class_type);
13075 At the point of definition of a virtual destructor (including
13076 an implicit definition), non-placement operator delete shall
13077 be looked up in the scope of the destructor's class and if
13078 found shall be accessible and unambiguous. */
13079 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13081 /*global_p=*/false,
13082 /*placement=*/NULL_TREE,
13083 /*alloc_fn=*/NULL_TREE);
13085 if_stmt = begin_if_stmt ();
13086 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13087 current_in_charge_parm,
13090 finish_expr_stmt (exprstmt);
13091 finish_then_clause (if_stmt);
13092 finish_if_stmt (if_stmt);
13095 if (targetm.cxx.cdtor_returns_this ())
13099 val = DECL_ARGUMENTS (current_function_decl);
13100 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13101 DECL_RESULT (current_function_decl), val);
13102 /* Return the address of the object. */
13103 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13104 add_stmt (exprstmt);
13108 /* Do the necessary processing for the beginning of a function body, which
13109 in this case includes member-initializers, but not the catch clauses of
13110 a function-try-block. Currently, this means opening a binding level
13111 for the member-initializers (in a ctor), member cleanups (in a dtor),
13112 and capture proxies (in a lambda operator()). */
13115 begin_function_body (void)
13119 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13122 if (processing_template_decl)
13123 /* Do nothing now. */;
13125 /* Always keep the BLOCK node associated with the outermost pair of
13126 curly braces of a function. These are needed for correct
13127 operation of dwarfout.c. */
13128 keep_next_level (true);
13130 stmt = begin_compound_stmt (BCS_FN_BODY);
13132 if (processing_template_decl)
13133 /* Do nothing now. */;
13134 else if (DECL_DESTRUCTOR_P (current_function_decl))
13135 begin_destructor_body ();
13140 /* Do the processing for the end of a function body. Currently, this means
13141 closing out the cleanups for fully-constructed bases and members, and in
13142 the case of the destructor, deleting the object if desired. Again, this
13143 is only meaningful for [cd]tors, since they are the only functions where
13144 there is a significant distinction between the main body and any
13145 function catch clauses. Handling, say, main() return semantics here
13146 would be wrong, as flowing off the end of a function catch clause for
13147 main() would also need to return 0. */
13150 finish_function_body (tree compstmt)
13152 if (compstmt == NULL_TREE)
13155 /* Close the block. */
13156 finish_compound_stmt (compstmt);
13158 if (processing_template_decl)
13159 /* Do nothing now. */;
13160 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13161 finish_constructor_body ();
13162 else if (DECL_DESTRUCTOR_P (current_function_decl))
13163 finish_destructor_body ();
13166 /* Given a function, returns the BLOCK corresponding to the outermost level
13167 of curly braces, skipping the artificial block created for constructor
13171 outer_curly_brace_block (tree fndecl)
13173 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13174 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13175 /* Skip the artificial function body block. */
13176 block = BLOCK_SUBBLOCKS (block);
13180 /* If FNDECL is a class's key method, add the class to the list of
13181 keyed classes that should be emitted. */
13184 record_key_method_defined (tree fndecl)
13186 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13187 && DECL_VIRTUAL_P (fndecl)
13188 && !processing_template_decl)
13190 tree fnclass = DECL_CONTEXT (fndecl);
13191 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13192 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13196 /* Subroutine of finish_function.
13197 Save the body of constexpr functions for possible
13198 future compile time evaluation. */
13201 maybe_save_function_definition (tree fun)
13203 if (!processing_template_decl
13204 && DECL_DECLARED_CONSTEXPR_P (fun)
13205 && !DECL_CLONED_FUNCTION_P (fun))
13206 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13209 /* Finish up a function declaration and compile that function
13210 all the way to assembler language output. The free the storage
13211 for the function definition.
13213 FLAGS is a bitwise or of the following values:
13215 We just finished processing the body of an in-class inline
13216 function definition. (This processing will have taken place
13217 after the class definition is complete.) */
13220 finish_function (int flags)
13222 tree fndecl = current_function_decl;
13223 tree fntype, ctype = NULL_TREE;
13224 int inclass_inline = (flags & 2) != 0;
13226 /* When we get some parse errors, we can end up without a
13227 current_function_decl, so cope. */
13228 if (fndecl == NULL_TREE)
13229 return error_mark_node;
13231 if (c_dialect_objc ())
13232 objc_finish_function ();
13234 gcc_assert (!defer_mark_used_calls);
13235 defer_mark_used_calls = true;
13237 record_key_method_defined (fndecl);
13239 fntype = TREE_TYPE (fndecl);
13241 /* TREE_READONLY (fndecl) = 1;
13242 This caused &foo to be of type ptr-to-const-function
13243 which then got a warning when stored in a ptr-to-function variable. */
13245 gcc_assert (building_stmt_list_p ());
13246 /* The current function is being defined, so its DECL_INITIAL should
13247 be set, and unless there's a multiple definition, it should be
13248 error_mark_node. */
13249 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13251 /* For a cloned function, we've already got all the code we need;
13252 there's no need to add any extra bits. */
13253 if (!DECL_CLONED_FUNCTION_P (fndecl))
13255 if (DECL_MAIN_P (current_function_decl))
13257 /* Make it so that `main' always returns 0 by default (or
13260 finish_return_stmt (integer_one_node);
13262 finish_return_stmt (integer_zero_node);
13266 if (use_eh_spec_block (current_function_decl))
13267 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13268 (TREE_TYPE (current_function_decl)),
13269 current_eh_spec_block);
13272 /* If we're saving up tree structure, tie off the function now. */
13273 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13275 finish_fname_decls ();
13277 /* If this function can't throw any exceptions, remember that. */
13278 if (!processing_template_decl
13279 && !cp_function_chain->can_throw
13280 && !flag_non_call_exceptions
13281 && !decl_replaceable_p (fndecl))
13282 TREE_NOTHROW (fndecl) = 1;
13284 /* This must come after expand_function_end because cleanups might
13285 have declarations (from inline functions) that need to go into
13286 this function's blocks. */
13288 /* If the current binding level isn't the outermost binding level
13289 for this function, either there is a bug, or we have experienced
13290 syntax errors and the statement tree is malformed. */
13291 if (current_binding_level->kind != sk_function_parms)
13293 /* Make sure we have already experienced errors. */
13294 gcc_assert (errorcount);
13296 /* Throw away the broken statement tree and extra binding
13298 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13300 while (current_binding_level->kind != sk_function_parms)
13302 if (current_binding_level->kind == sk_class)
13303 pop_nested_class ();
13305 poplevel (0, 0, 0);
13308 poplevel (1, 0, 1);
13310 /* Statements should always be full-expressions at the outermost set
13311 of curly braces for a function. */
13312 gcc_assert (stmts_are_full_exprs_p ());
13314 /* Save constexpr function body before it gets munged by
13315 the NRV transformation. */
13316 maybe_save_function_definition (fndecl);
13318 /* Set up the named return value optimization, if we can. Candidate
13319 variables are selected in check_return_expr. */
13320 if (current_function_return_value)
13322 tree r = current_function_return_value;
13325 if (r != error_mark_node
13326 /* This is only worth doing for fns that return in memory--and
13327 simpler, since we don't have to worry about promoted modes. */
13328 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13329 /* Only allow this for variables declared in the outer scope of
13330 the function so we know that their lifetime always ends with a
13331 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13332 we were to do this optimization in tree-ssa. */
13333 && (outer = outer_curly_brace_block (fndecl))
13334 && chain_member (r, BLOCK_VARS (outer)))
13335 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13337 current_function_return_value = NULL_TREE;
13340 /* Remember that we were in class scope. */
13341 if (current_class_name)
13342 ctype = current_class_type;
13344 /* Must mark the RESULT_DECL as being in this function. */
13345 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13347 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13348 to the FUNCTION_DECL node itself. */
13349 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13351 /* Save away current state, if appropriate. */
13352 if (!processing_template_decl)
13353 save_function_data (fndecl);
13355 /* Complain if there's just no return statement. */
13356 if (warn_return_type
13357 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13358 && !dependent_type_p (TREE_TYPE (fntype))
13359 && !current_function_returns_value && !current_function_returns_null
13360 /* Don't complain if we abort or throw. */
13361 && !current_function_returns_abnormally
13362 /* Don't complain if we are declared noreturn. */
13363 && !TREE_THIS_VOLATILE (fndecl)
13364 && !DECL_NAME (DECL_RESULT (fndecl))
13365 && !TREE_NO_WARNING (fndecl)
13366 /* Structor return values (if any) are set by the compiler. */
13367 && !DECL_CONSTRUCTOR_P (fndecl)
13368 && !DECL_DESTRUCTOR_P (fndecl))
13370 warning (OPT_Wreturn_type,
13371 "no return statement in function returning non-void");
13372 TREE_NO_WARNING (fndecl) = 1;
13375 /* Store the end of the function, so that we get good line number
13376 info for the epilogue. */
13377 cfun->function_end_locus = input_location;
13379 /* Complain about parameters that are only set, but never otherwise used. */
13380 if (warn_unused_but_set_parameter
13381 && !processing_template_decl
13382 && errorcount == unused_but_set_errorcount
13383 && !DECL_CLONED_FUNCTION_P (fndecl))
13387 for (decl = DECL_ARGUMENTS (fndecl);
13389 decl = DECL_CHAIN (decl))
13390 if (TREE_USED (decl)
13391 && TREE_CODE (decl) == PARM_DECL
13392 && !DECL_READ_P (decl)
13393 && DECL_NAME (decl)
13394 && !DECL_ARTIFICIAL (decl)
13395 && !TREE_NO_WARNING (decl)
13396 && !DECL_IN_SYSTEM_HEADER (decl)
13397 && TREE_TYPE (decl) != error_mark_node
13398 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13399 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13400 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13401 warning (OPT_Wunused_but_set_parameter,
13402 "parameter %q+D set but not used", decl);
13403 unused_but_set_errorcount = errorcount;
13406 /* Complain about locally defined typedefs that are not used in this
13408 maybe_warn_unused_local_typedefs ();
13410 /* Genericize before inlining. */
13411 if (!processing_template_decl)
13413 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13414 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13415 cp_genericize (fndecl);
13416 /* Clear out the bits we don't need. */
13417 f->x_current_class_ptr = NULL;
13418 f->x_current_class_ref = NULL;
13419 f->x_eh_spec_block = NULL;
13420 f->x_in_charge_parm = NULL;
13421 f->x_vtt_parm = NULL;
13422 f->x_return_value = NULL;
13423 f->bindings = NULL;
13424 f->extern_decl_map = NULL;
13426 /* Clear out the bits we don't need. */
13427 local_names = NULL;
13429 /* We're leaving the context of this function, so zap cfun. It's still in
13430 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13432 current_function_decl = NULL;
13434 /* If this is an in-class inline definition, we may have to pop the
13435 bindings for the template parameters that we added in
13436 maybe_begin_member_template_processing when start_function was
13438 if (inclass_inline)
13439 maybe_end_member_template_processing ();
13441 /* Leave the scope of the class. */
13443 pop_nested_class ();
13448 current_function_decl = NULL_TREE;
13450 defer_mark_used_calls = false;
13451 if (deferred_mark_used_calls)
13456 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13458 VEC_free (tree, gc, deferred_mark_used_calls);
13464 /* Create the FUNCTION_DECL for a function definition.
13465 DECLSPECS and DECLARATOR are the parts of the declaration;
13466 they describe the return type and the name of the function,
13467 but twisted together in a fashion that parallels the syntax of C.
13469 This function creates a binding context for the function body
13470 as well as setting up the FUNCTION_DECL in current_function_decl.
13472 Returns a FUNCTION_DECL on success.
13474 If the DECLARATOR is not suitable for a function (it defines a datum
13475 instead), we return 0, which tells yyparse to report a parse error.
13477 May return void_type_node indicating that this method is actually
13478 a friend. See grokfield for more details.
13480 Came here with a `.pushlevel' .
13482 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13483 CHANGES TO CODE IN `grokfield'. */
13486 grokmethod (cp_decl_specifier_seq *declspecs,
13487 const cp_declarator *declarator, tree attrlist)
13489 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13492 if (fndecl == error_mark_node)
13493 return error_mark_node;
13495 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13497 error ("invalid member function declaration");
13498 return error_mark_node;
13502 cplus_decl_attributes (&fndecl, attrlist, 0);
13504 /* Pass friends other than inline friend functions back. */
13505 if (fndecl == void_type_node)
13508 if (DECL_IN_AGGR_P (fndecl))
13510 if (DECL_CLASS_SCOPE_P (fndecl))
13511 error ("%qD is already defined in class %qT", fndecl,
13512 DECL_CONTEXT (fndecl));
13513 return error_mark_node;
13516 check_template_shadow (fndecl);
13518 DECL_DECLARED_INLINE_P (fndecl) = 1;
13519 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13521 /* We process method specializations in finish_struct_1. */
13522 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13524 fndecl = push_template_decl (fndecl);
13525 if (fndecl == error_mark_node)
13529 if (! DECL_FRIEND_P (fndecl))
13531 if (DECL_CHAIN (fndecl))
13533 fndecl = copy_node (fndecl);
13534 TREE_CHAIN (fndecl) = NULL_TREE;
13538 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13540 DECL_IN_AGGR_P (fndecl) = 1;
13545 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13546 we can lay it out later, when and if its type becomes complete. */
13549 maybe_register_incomplete_var (tree var)
13551 gcc_assert (TREE_CODE (var) == VAR_DECL);
13553 /* Keep track of variables with incomplete types. */
13554 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13555 && DECL_EXTERNAL (var))
13557 tree inner_type = TREE_TYPE (var);
13559 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13560 inner_type = TREE_TYPE (inner_type);
13561 inner_type = TYPE_MAIN_VARIANT (inner_type);
13563 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13564 /* RTTI TD entries are created while defining the type_info. */
13565 || (TYPE_LANG_SPECIFIC (inner_type)
13566 && TYPE_BEING_DEFINED (inner_type)))
13569 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13571 iv->incomplete_type = inner_type;
13576 /* Called when a class type (given by TYPE) is defined. If there are
13577 any existing VAR_DECLs whose type has been completed by this
13578 declaration, update them now. */
13581 complete_vars (tree type)
13584 incomplete_var *iv;
13586 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13588 if (same_type_p (type, iv->incomplete_type))
13590 tree var = iv->decl;
13591 tree type = TREE_TYPE (var);
13592 /* Complete the type of the variable. The VAR_DECL itself
13593 will be laid out in expand_expr. */
13594 complete_type (type);
13595 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13596 /* Remove this entry from the list. */
13597 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13603 /* Check for pending declarations which may have abstract type. */
13604 complete_type_check_abstract (type);
13607 /* If DECL is of a type which needs a cleanup, build and return an
13608 expression to perform that cleanup here. Return NULL_TREE if no
13609 cleanup need be done. */
13612 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13618 /* Assume no cleanup is required. */
13619 cleanup = NULL_TREE;
13621 if (error_operand_p (decl))
13624 /* Handle "__attribute__((cleanup))". We run the cleanup function
13625 before the destructor since the destructor is what actually
13626 terminates the lifetime of the object. */
13627 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13634 /* Get the name specified by the user for the cleanup function. */
13635 id = TREE_VALUE (TREE_VALUE (attr));
13636 /* Look up the name to find the cleanup function to call. It is
13637 important to use lookup_name here because that is what is
13638 used in c-common.c:handle_cleanup_attribute when performing
13639 initial checks on the attribute. Note that those checks
13640 include ensuring that the function found is not an overloaded
13641 function, or an object with an overloaded call operator,
13642 etc.; we can rely on the fact that the function found is an
13643 ordinary FUNCTION_DECL. */
13644 fn = lookup_name (id);
13645 arg = build_address (decl);
13647 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13648 if (cleanup == error_mark_node)
13649 return error_mark_node;
13651 /* Handle ordinary C++ destructors. */
13652 type = TREE_TYPE (decl);
13653 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13655 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13656 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13657 && CLASSTYPE_VBASECLASSES (type));
13661 if (TREE_CODE (type) == ARRAY_TYPE)
13664 addr = build_address (decl);
13666 /* Optimize for space over speed here. */
13667 if (!has_vbases || flag_expensive_optimizations)
13668 flags |= LOOKUP_NONVIRTUAL;
13670 call = build_delete (TREE_TYPE (addr), addr,
13671 sfk_complete_destructor, flags, 0, complain);
13672 if (call == error_mark_node)
13673 cleanup = error_mark_node;
13675 cleanup = cp_build_compound_expr (cleanup, call, complain);
13683 /* When a stmt has been parsed, this function is called. */
13690 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13691 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13692 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13695 static_fn_type (tree memfntype)
13700 if (TYPE_PTRMEMFUNC_P (memfntype))
13701 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13702 if (POINTER_TYPE_P (memfntype)
13703 || TREE_CODE (memfntype) == FUNCTION_DECL)
13704 memfntype = TREE_TYPE (memfntype);
13705 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13707 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13708 args = TYPE_ARG_TYPES (memfntype);
13709 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13710 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13711 fntype = (cp_build_type_attribute_variant
13712 (fntype, TYPE_ATTRIBUTES (memfntype)));
13713 fntype = (build_exception_variant
13714 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13718 /* DECL was originally constructed as a non-static member function,
13719 but turned out to be static. Update it accordingly. */
13722 revert_static_member_fn (tree decl)
13724 tree stype = static_fn_type (decl);
13725 cp_cv_quals quals = type_memfn_quals (stype);
13727 if (quals != TYPE_UNQUALIFIED)
13728 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13730 TREE_TYPE (decl) = stype;
13732 if (DECL_ARGUMENTS (decl))
13733 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13734 DECL_STATIC_FUNCTION_P (decl) = 1;
13737 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13738 one of the language-independent trees. */
13740 enum cp_tree_node_structure_enum
13741 cp_tree_node_structure (union lang_tree_node * t)
13743 switch (TREE_CODE (&t->generic))
13745 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13746 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13747 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13748 case OVERLOAD: return TS_CP_OVERLOAD;
13749 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13750 case PTRMEM_CST: return TS_CP_PTRMEM;
13751 case BASELINK: return TS_CP_BASELINK;
13752 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13753 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13754 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13755 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13756 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13757 default: return TS_CP_GENERIC;
13761 /* Build the void_list_node (void_type_node having been created). */
13763 build_void_list_node (void)
13765 tree t = build_tree_list (NULL_TREE, void_type_node);
13770 cp_missing_noreturn_ok_p (tree decl)
13772 /* A missing noreturn is ok for the `main' function. */
13773 return DECL_MAIN_P (decl);
13776 /* Return the COMDAT group into which DECL should be placed. */
13779 cxx_comdat_group (tree decl)
13783 /* Virtual tables, construction virtual tables, and virtual table
13784 tables all go in a single COMDAT group, named after the primary
13786 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13787 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13788 /* For all other DECLs, the COMDAT group is the mangled name of the
13789 declaration itself. */
13792 while (DECL_THUNK_P (decl))
13794 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13795 into the same section as the target function. In that case
13796 we must return target's name. */
13797 tree target = THUNK_TARGET (decl);
13798 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13799 && DECL_SECTION_NAME (target) != NULL
13800 && DECL_ONE_ONLY (target))
13805 name = DECL_ASSEMBLER_NAME (decl);
13811 #include "gt-cp-decl.h"