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 (UDLIT_OPER_P (DECL_NAME (newdecl))
1207 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1209 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1210 && TREE_CODE (olddecl) != TEMPLATE_DECL
1211 && check_raw_literal_operator (olddecl))
1212 error ("literal operator template %q+D conflicts with"
1213 " raw literal operator %qD", newdecl, olddecl);
1214 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1215 && TREE_CODE (olddecl) == TEMPLATE_DECL
1216 && check_raw_literal_operator (newdecl))
1217 error ("raw literal operator %q+D conflicts with"
1218 " literal operator template %qD", newdecl, olddecl);
1221 if (DECL_P (olddecl)
1222 && TREE_CODE (newdecl) == FUNCTION_DECL
1223 && TREE_CODE (olddecl) == FUNCTION_DECL
1224 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1226 if (DECL_DECLARED_INLINE_P (newdecl)
1227 && DECL_UNINLINABLE (newdecl)
1228 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1229 /* Already warned elsewhere. */;
1230 else if (DECL_DECLARED_INLINE_P (olddecl)
1231 && DECL_UNINLINABLE (olddecl)
1232 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1233 /* Already warned. */;
1234 else if (DECL_DECLARED_INLINE_P (newdecl)
1235 && DECL_UNINLINABLE (olddecl)
1236 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1238 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1240 warning (OPT_Wattributes, "previous declaration of %q+D "
1241 "with attribute noinline", olddecl);
1243 else if (DECL_DECLARED_INLINE_P (olddecl)
1244 && DECL_UNINLINABLE (newdecl)
1245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1247 warning (OPT_Wattributes, "function %q+D redeclared with "
1248 "attribute noinline", newdecl);
1249 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1254 /* Check for redeclaration and other discrepancies. */
1255 if (TREE_CODE (olddecl) == FUNCTION_DECL
1256 && DECL_ARTIFICIAL (olddecl))
1258 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1259 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1261 /* Avoid warnings redeclaring built-ins which have not been
1262 explicitly declared. */
1263 if (DECL_ANTICIPATED (olddecl))
1266 /* If you declare a built-in or predefined function name as static,
1267 the old definition is overridden, but optionally warn this was a
1268 bad choice of name. */
1269 if (! TREE_PUBLIC (newdecl))
1271 warning (OPT_Wshadow,
1272 DECL_BUILT_IN (olddecl)
1273 ? G_("shadowing built-in function %q#D")
1274 : G_("shadowing library function %q#D"), olddecl);
1275 /* Discard the old built-in function. */
1278 /* If the built-in is not ansi, then programs can override
1279 it even globally without an error. */
1280 else if (! DECL_BUILT_IN (olddecl))
1281 warning (0, "library function %q#D redeclared as non-function %q#D",
1285 error ("declaration of %q#D", newdecl);
1286 error ("conflicts with built-in declaration %q#D",
1291 else if (!types_match)
1293 /* Avoid warnings redeclaring built-ins which have not been
1294 explicitly declared. */
1295 if (DECL_ANTICIPATED (olddecl))
1297 /* Deal with fileptr_type_node. FILE type is not known
1298 at the time we create the builtins. */
1301 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1302 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1307 else if (TREE_VALUE (t2) == fileptr_type_node)
1309 tree t = TREE_VALUE (t1);
1311 if (TREE_CODE (t) == POINTER_TYPE
1312 && TYPE_NAME (TREE_TYPE (t))
1313 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1314 == get_identifier ("FILE")
1315 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1317 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1320 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1321 types_match = decls_match (newdecl, olddecl);
1323 return duplicate_decls (newdecl, olddecl,
1325 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1328 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1331 else if ((DECL_EXTERN_C_P (newdecl)
1332 && DECL_EXTERN_C_P (olddecl))
1333 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1334 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1336 /* A near match; override the builtin. */
1338 if (TREE_PUBLIC (newdecl))
1340 warning (0, "new declaration %q#D", newdecl);
1341 warning (0, "ambiguates built-in declaration %q#D",
1345 warning (OPT_Wshadow,
1346 DECL_BUILT_IN (olddecl)
1347 ? G_("shadowing built-in function %q#D")
1348 : G_("shadowing library function %q#D"), olddecl);
1351 /* Discard the old built-in function. */
1354 /* Replace the old RTL to avoid problems with inlining. */
1355 COPY_DECL_RTL (newdecl, olddecl);
1357 /* Even if the types match, prefer the new declarations type for
1358 built-ins which have not been explicitly declared, for
1359 exception lists, etc... */
1360 else if (DECL_IS_BUILTIN (olddecl))
1362 tree type = TREE_TYPE (newdecl);
1363 tree attribs = (*targetm.merge_type_attributes)
1364 (TREE_TYPE (olddecl), type);
1366 type = cp_build_type_attribute_variant (type, attribs);
1367 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1370 /* If a function is explicitly declared "throw ()", propagate that to
1371 the corresponding builtin. */
1372 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1373 && DECL_ANTICIPATED (olddecl)
1374 && TREE_NOTHROW (newdecl)
1375 && !TREE_NOTHROW (olddecl))
1377 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1378 tree tmpdecl = builtin_decl_explicit (fncode);
1379 if (tmpdecl && tmpdecl != olddecl && types_match)
1380 TREE_NOTHROW (tmpdecl) = 1;
1383 /* Whether or not the builtin can throw exceptions has no
1384 bearing on this declarator. */
1385 TREE_NOTHROW (olddecl) = 0;
1387 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1389 /* If a builtin function is redeclared as `static', merge
1390 the declarations, but make the original one static. */
1391 DECL_THIS_STATIC (olddecl) = 1;
1392 TREE_PUBLIC (olddecl) = 0;
1394 /* Make the old declaration consistent with the new one so
1395 that all remnants of the builtin-ness of this function
1396 will be banished. */
1397 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1398 COPY_DECL_RTL (newdecl, olddecl);
1401 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1403 /* C++ Standard, 3.3, clause 4:
1404 "[Note: a namespace name or a class template name must be unique
1405 in its declarative region (7.3.2, clause 14). ]" */
1406 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1407 && TREE_CODE (newdecl) != NAMESPACE_DECL
1408 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1409 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1410 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1411 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1413 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1414 && TREE_CODE (newdecl) != TYPE_DECL)
1415 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1416 && TREE_CODE (olddecl) != TYPE_DECL))
1418 /* We do nothing special here, because C++ does such nasty
1419 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1420 get shadowed, and know that if we need to find a TYPE_DECL
1421 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1422 slot of the identifier. */
1426 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1427 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1428 || (TREE_CODE (olddecl) == FUNCTION_DECL
1429 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1433 error ("%q#D redeclared as different kind of symbol", newdecl);
1434 if (TREE_CODE (olddecl) == TREE_LIST)
1435 olddecl = TREE_VALUE (olddecl);
1436 error ("previous declaration of %q+#D", olddecl);
1438 return error_mark_node;
1440 else if (!types_match)
1442 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1443 /* These are certainly not duplicate declarations; they're
1444 from different scopes. */
1447 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1449 /* The name of a class template may not be declared to refer to
1450 any other template, class, function, object, namespace, value,
1451 or type in the same scope. */
1452 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1453 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1455 error ("declaration of template %q#D", newdecl);
1456 error ("conflicts with previous declaration %q+#D", olddecl);
1458 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1459 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1460 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1461 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1462 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1463 DECL_TEMPLATE_PARMS (olddecl))
1464 /* Template functions can be disambiguated by
1466 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1467 TREE_TYPE (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1474 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1476 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1478 error ("declaration of C function %q#D conflicts with",
1480 error ("previous declaration %q+#D here", olddecl);
1483 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1484 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1486 error ("new declaration %q#D", newdecl);
1487 error ("ambiguates old declaration %q+#D", olddecl);
1488 return error_mark_node;
1495 error ("conflicting declaration %q#D", newdecl);
1496 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1497 return error_mark_node;
1500 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1501 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1502 && (!DECL_TEMPLATE_INFO (newdecl)
1503 || (DECL_TI_TEMPLATE (newdecl)
1504 != DECL_TI_TEMPLATE (olddecl))))
1505 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1506 && (!DECL_TEMPLATE_INFO (olddecl)
1507 || (DECL_TI_TEMPLATE (olddecl)
1508 != DECL_TI_TEMPLATE (newdecl))))))
1509 /* It's OK to have a template specialization and a non-template
1510 with the same type, or to have specializations of two
1511 different templates with the same type. Note that if one is a
1512 specialization, and the other is an instantiation of the same
1513 template, that we do not exit at this point. That situation
1514 can occur if we instantiate a template class, and then
1515 specialize one of its methods. This situation is valid, but
1516 the declarations must be merged in the usual way. */
1518 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1519 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1520 && !DECL_USE_TEMPLATE (newdecl))
1521 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1522 && !DECL_USE_TEMPLATE (olddecl))))
1523 /* One of the declarations is a template instantiation, and the
1524 other is not a template at all. That's OK. */
1526 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1528 /* In [namespace.alias] we have:
1530 In a declarative region, a namespace-alias-definition can be
1531 used to redefine a namespace-alias declared in that declarative
1532 region to refer only to the namespace to which it already
1535 Therefore, if we encounter a second alias directive for the same
1536 alias, we can just ignore the second directive. */
1537 if (DECL_NAMESPACE_ALIAS (newdecl)
1538 && (DECL_NAMESPACE_ALIAS (newdecl)
1539 == DECL_NAMESPACE_ALIAS (olddecl)))
1541 /* [namespace.alias]
1543 A namespace-name or namespace-alias shall not be declared as
1544 the name of any other entity in the same declarative region.
1545 A namespace-name defined at global scope shall not be
1546 declared as the name of any other entity in any global scope
1548 error ("declaration of namespace %qD conflicts with", newdecl);
1549 error ("previous declaration of namespace %q+D here", olddecl);
1550 return error_mark_node;
1554 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1557 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1558 if (DECL_NAME (olddecl) != NULL_TREE)
1559 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1560 ? G_("%q+#D previously defined here")
1561 : G_("%q+#D previously declared here"), olddecl);
1562 return error_mark_node;
1564 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1565 && DECL_INITIAL (olddecl) != NULL_TREE
1566 && !prototype_p (TREE_TYPE (olddecl))
1567 && prototype_p (TREE_TYPE (newdecl)))
1569 /* Prototype decl follows defn w/o prototype. */
1570 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1571 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1572 "follows non-prototype definition here");
1574 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1575 || TREE_CODE (olddecl) == VAR_DECL)
1576 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1579 If two declarations of the same function or object
1580 specify different linkage-specifications ..., the program
1581 is ill-formed.... Except for functions with C++ linkage,
1582 a function declaration without a linkage specification
1583 shall not precede the first linkage specification for
1584 that function. A function can be declared without a
1585 linkage specification after an explicit linkage
1586 specification has been seen; the linkage explicitly
1587 specified in the earlier declaration is not affected by
1588 such a function declaration.
1590 DR 563 raises the question why the restrictions on
1591 functions should not also apply to objects. Older
1592 versions of G++ silently ignore the linkage-specification
1600 which is clearly wrong. Therefore, we now treat objects
1602 if (current_lang_depth () == 0)
1604 /* There is no explicit linkage-specification, so we use
1605 the linkage from the previous declaration. */
1606 if (!DECL_LANG_SPECIFIC (newdecl))
1607 retrofit_lang_decl (newdecl);
1608 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1612 error ("previous declaration of %q+#D with %qL linkage",
1613 olddecl, DECL_LANGUAGE (olddecl));
1614 error ("conflicts with new declaration with %qL linkage",
1615 DECL_LANGUAGE (newdecl));
1619 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1621 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1623 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1624 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1627 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1628 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1630 for (; t1 && t1 != void_list_node;
1631 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1632 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1634 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1637 permerror (input_location, "default argument given for parameter %d of %q#D",
1639 permerror (input_location, "after previous specification in %q+#D", olddecl);
1643 error ("default argument given for parameter %d of %q#D",
1645 error ("after previous specification in %q+#D",
1652 /* Do not merge an implicit typedef with an explicit one. In:
1656 typedef class A A __attribute__ ((foo));
1658 the attribute should apply only to the typedef. */
1659 if (TREE_CODE (olddecl) == TYPE_DECL
1660 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1661 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1664 /* If new decl is `static' and an `extern' was seen previously,
1666 warn_extern_redeclared_static (newdecl, olddecl);
1668 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1669 return error_mark_node;
1671 /* We have committed to returning 1 at this point. */
1672 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1674 /* Now that functions must hold information normally held
1675 by field decls, there is extra work to do so that
1676 declaration information does not get destroyed during
1678 if (DECL_VINDEX (olddecl))
1679 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1680 if (DECL_CONTEXT (olddecl))
1681 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1682 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1683 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1684 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1685 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1686 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1687 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1688 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1689 SET_OVERLOADED_OPERATOR_CODE
1690 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1691 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1693 /* Optionally warn about more than one declaration for the same
1694 name, but don't warn about a function declaration followed by a
1696 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1697 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1698 /* Don't warn about extern decl followed by definition. */
1699 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1700 /* Don't warn about friends, let add_friend take care of it. */
1701 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1703 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1704 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1707 if (DECL_DELETED_FN (newdecl))
1709 error ("deleted definition of %qD", newdecl);
1710 error ("after previous declaration %q+D", olddecl);
1712 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1715 /* Deal with C++: must preserve virtual function table size. */
1716 if (TREE_CODE (olddecl) == TYPE_DECL)
1718 tree newtype = TREE_TYPE (newdecl);
1719 tree oldtype = TREE_TYPE (olddecl);
1721 if (newtype != error_mark_node && oldtype != error_mark_node
1722 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1723 CLASSTYPE_FRIEND_CLASSES (newtype)
1724 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1726 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1729 /* Copy all the DECL_... slots specified in the new decl
1730 except for any that we copy here from the old type. */
1731 DECL_ATTRIBUTES (newdecl)
1732 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1734 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1738 old_result = DECL_TEMPLATE_RESULT (olddecl);
1739 new_result = DECL_TEMPLATE_RESULT (newdecl);
1740 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1741 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1742 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1743 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1745 DECL_ATTRIBUTES (old_result)
1746 = (*targetm.merge_decl_attributes) (old_result, new_result);
1748 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1750 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1751 && DECL_INITIAL (new_result))
1753 if (DECL_INITIAL (old_result))
1754 DECL_UNINLINABLE (old_result) = 1;
1756 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1757 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1758 DECL_NOT_REALLY_EXTERN (old_result)
1759 = DECL_NOT_REALLY_EXTERN (new_result);
1760 DECL_INTERFACE_KNOWN (old_result)
1761 = DECL_INTERFACE_KNOWN (new_result);
1762 DECL_DECLARED_INLINE_P (old_result)
1763 = DECL_DECLARED_INLINE_P (new_result);
1764 DECL_DISREGARD_INLINE_LIMITS (old_result)
1765 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1770 DECL_DECLARED_INLINE_P (old_result)
1771 |= DECL_DECLARED_INLINE_P (new_result);
1772 DECL_DISREGARD_INLINE_LIMITS (old_result)
1773 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1774 check_redeclaration_exception_specification (newdecl, olddecl);
1778 /* If the new declaration is a definition, update the file and
1779 line information on the declaration, and also make
1780 the old declaration the same definition. */
1781 if (DECL_INITIAL (new_result) != NULL_TREE)
1783 DECL_SOURCE_LOCATION (olddecl)
1784 = DECL_SOURCE_LOCATION (old_result)
1785 = DECL_SOURCE_LOCATION (newdecl);
1786 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1787 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1790 DECL_ARGUMENTS (old_result)
1791 = DECL_ARGUMENTS (new_result);
1792 for (parm = DECL_ARGUMENTS (old_result); parm;
1793 parm = DECL_CHAIN (parm))
1794 DECL_CONTEXT (parm) = old_result;
1803 /* Automatically handles default parameters. */
1804 tree oldtype = TREE_TYPE (olddecl);
1807 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1808 maybe_instantiate_noexcept (olddecl);
1810 /* Merge the data types specified in the two decls. */
1811 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1813 /* If merge_types produces a non-typedef type, just use the old type. */
1814 if (TREE_CODE (newdecl) == TYPE_DECL
1815 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1818 if (TREE_CODE (newdecl) == VAR_DECL)
1820 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1821 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1822 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1823 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1824 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1825 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1827 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1828 if (DECL_LANG_SPECIFIC (olddecl)
1829 && CP_DECL_THREADPRIVATE_P (olddecl))
1831 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1832 if (!DECL_LANG_SPECIFIC (newdecl))
1833 retrofit_lang_decl (newdecl);
1835 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1836 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1840 /* Do this after calling `merge_types' so that default
1841 parameters don't confuse us. */
1842 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 check_redeclaration_exception_specification (newdecl, olddecl);
1844 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1846 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 check_default_args (newdecl);
1849 /* Lay the type out, unless already done. */
1850 if (! same_type_p (newtype, oldtype)
1851 && TREE_TYPE (newdecl) != error_mark_node
1852 && !(processing_template_decl && uses_template_parms (newdecl)))
1853 layout_type (TREE_TYPE (newdecl));
1855 if ((TREE_CODE (newdecl) == VAR_DECL
1856 || TREE_CODE (newdecl) == PARM_DECL
1857 || TREE_CODE (newdecl) == RESULT_DECL
1858 || TREE_CODE (newdecl) == FIELD_DECL
1859 || TREE_CODE (newdecl) == TYPE_DECL)
1860 && !(processing_template_decl && uses_template_parms (newdecl)))
1861 layout_decl (newdecl, 0);
1863 /* Merge the type qualifiers. */
1864 if (TREE_READONLY (newdecl))
1865 TREE_READONLY (olddecl) = 1;
1866 if (TREE_THIS_VOLATILE (newdecl))
1867 TREE_THIS_VOLATILE (olddecl) = 1;
1868 if (TREE_NOTHROW (newdecl))
1869 TREE_NOTHROW (olddecl) = 1;
1871 /* Merge deprecatedness. */
1872 if (TREE_DEPRECATED (newdecl))
1873 TREE_DEPRECATED (olddecl) = 1;
1875 /* Preserve function specific target and optimization options */
1876 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1878 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1879 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1880 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1881 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1883 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1884 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1885 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1886 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1889 /* Merge the initialization information. */
1890 if (DECL_INITIAL (newdecl) == NULL_TREE
1891 && DECL_INITIAL (olddecl) != NULL_TREE)
1893 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1894 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1895 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1897 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1898 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1902 /* Merge the section attribute.
1903 We want to issue an error if the sections conflict but that must be
1904 done later in decl_attributes since we are called before attributes
1906 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1907 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1909 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1911 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1912 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1913 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1914 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1915 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1916 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1917 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1918 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1919 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1920 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1921 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1922 /* Keep the old RTL. */
1923 COPY_DECL_RTL (olddecl, newdecl);
1925 else if (TREE_CODE (newdecl) == VAR_DECL
1926 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1928 /* Keep the old RTL. We cannot keep the old RTL if the old
1929 declaration was for an incomplete object and the new
1930 declaration is not since many attributes of the RTL will
1932 COPY_DECL_RTL (olddecl, newdecl);
1935 /* If cannot merge, then use the new type and qualifiers,
1936 and don't preserve the old rtl. */
1939 /* Clean out any memory we had of the old declaration. */
1940 tree oldstatic = value_member (olddecl, static_aggregates);
1942 TREE_VALUE (oldstatic) = error_mark_node;
1944 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1945 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1946 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1947 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1950 /* Merge the storage class information. */
1951 merge_weak (newdecl, olddecl);
1953 if (DECL_ONE_ONLY (olddecl))
1954 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1956 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1957 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1958 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1959 if (! DECL_EXTERNAL (olddecl))
1960 DECL_EXTERNAL (newdecl) = 0;
1962 new_template_info = NULL_TREE;
1963 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1965 bool new_redefines_gnu_inline = false;
1967 if (new_defines_function
1968 && ((DECL_INTERFACE_KNOWN (olddecl)
1969 && TREE_CODE (olddecl) == FUNCTION_DECL)
1970 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1971 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1972 == FUNCTION_DECL))))
1976 if (TREE_CODE (fn) == TEMPLATE_DECL)
1977 fn = DECL_TEMPLATE_RESULT (olddecl);
1979 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1982 if (!new_redefines_gnu_inline)
1984 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1985 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1986 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1988 DECL_TEMPLATE_INSTANTIATED (newdecl)
1989 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1990 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1992 /* If the OLDDECL is an instantiation and/or specialization,
1993 then the NEWDECL must be too. But, it may not yet be marked
1994 as such if the caller has created NEWDECL, but has not yet
1995 figured out that it is a redeclaration. */
1996 if (!DECL_USE_TEMPLATE (newdecl))
1997 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1999 /* Don't really know how much of the language-specific
2000 values we should copy from old to new. */
2001 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2002 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2003 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2004 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2006 if (LANG_DECL_HAS_MIN (newdecl))
2008 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2009 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2010 if (DECL_TEMPLATE_INFO (newdecl))
2011 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2012 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2014 /* Only functions have these fields. */
2015 if (TREE_CODE (newdecl) == FUNCTION_DECL
2016 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2018 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2019 olddecl_friend = DECL_FRIEND_P (olddecl);
2020 hidden_friend = (DECL_ANTICIPATED (olddecl)
2021 && DECL_HIDDEN_FRIEND_P (olddecl)
2022 && newdecl_is_friend);
2023 DECL_BEFRIENDING_CLASSES (newdecl)
2024 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2025 DECL_BEFRIENDING_CLASSES (olddecl));
2026 /* DECL_THUNKS is only valid for virtual functions,
2027 otherwise it is a DECL_FRIEND_CONTEXT. */
2028 if (DECL_VIRTUAL_P (newdecl))
2029 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2031 /* Only variables have this field. */
2032 else if (TREE_CODE (newdecl) == VAR_DECL
2033 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2034 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2041 /* Merge parameter attributes. */
2042 tree oldarg, newarg;
2043 for (oldarg = DECL_ARGUMENTS(olddecl),
2044 newarg = DECL_ARGUMENTS(newdecl);
2046 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2047 DECL_ATTRIBUTES (newarg)
2048 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2049 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2052 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2053 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2055 /* If newdecl is not a specialization, then it is not a
2056 template-related function at all. And that means that we
2057 should have exited above, returning 0. */
2058 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2060 if (DECL_ODR_USED (olddecl))
2061 /* From [temp.expl.spec]:
2063 If a template, a member template or the member of a class
2064 template is explicitly specialized then that
2065 specialization shall be declared before the first use of
2066 that specialization that would cause an implicit
2067 instantiation to take place, in every translation unit in
2068 which such a use occurs. */
2069 error ("explicit specialization of %qD after first use",
2072 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2074 /* Don't propagate visibility from the template to the
2075 specialization here. We'll do that in determine_visibility if
2077 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2079 /* [temp.expl.spec/14] We don't inline explicit specialization
2080 just because the primary template says so. */
2082 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2083 the always_inline attribute. */
2084 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2085 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2087 if (DECL_DECLARED_INLINE_P (newdecl))
2088 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2090 DECL_ATTRIBUTES (newdecl)
2091 = remove_attribute ("always_inline",
2092 DECL_ATTRIBUTES (newdecl));
2095 else if (new_defines_function && DECL_INITIAL (olddecl))
2097 /* Never inline re-defined extern inline functions.
2098 FIXME: this could be better handled by keeping both
2099 function as separate declarations. */
2100 DECL_UNINLINABLE (newdecl) = 1;
2104 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2105 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2107 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2109 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2110 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2112 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2113 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2114 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2115 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2118 /* Preserve abstractness on cloned [cd]tors. */
2119 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2121 /* Update newdecl's parms to point at olddecl. */
2122 for (parm = DECL_ARGUMENTS (newdecl); parm;
2123 parm = DECL_CHAIN (parm))
2124 DECL_CONTEXT (parm) = olddecl;
2128 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2129 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2130 COPY_DECL_RTL (newdecl, olddecl);
2132 if (! types_match || new_defines_function)
2134 /* These need to be copied so that the names are available.
2135 Note that if the types do match, we'll preserve inline
2136 info and other bits, but if not, we won't. */
2137 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2138 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2140 if (new_defines_function)
2141 /* If defining a function declared with other language
2142 linkage, use the previously declared language linkage. */
2143 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2144 else if (types_match)
2146 /* If redeclaring a builtin function, and not a definition,
2147 it stays built in. */
2148 if (DECL_BUILT_IN (olddecl))
2150 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2151 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2152 /* If we're keeping the built-in definition, keep the rtl,
2153 regardless of declaration matches. */
2154 COPY_DECL_RTL (olddecl, newdecl);
2155 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2157 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2160 /* If a compatible prototype of these builtin functions
2161 is seen, assume the runtime implements it with the
2162 expected semantics. */
2163 case BUILT_IN_STPCPY:
2164 if (builtin_decl_explicit_p (fncode))
2165 set_builtin_decl_implicit_p (fncode, true);
2173 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2174 /* Don't clear out the arguments if we're just redeclaring a
2176 if (DECL_ARGUMENTS (olddecl))
2177 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2180 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2181 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2183 /* Now preserve various other info from the definition. */
2184 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2185 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2186 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2187 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2189 /* Warn about conflicting visibility specifications. */
2190 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2191 && DECL_VISIBILITY_SPECIFIED (newdecl)
2192 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2194 warning_at (input_location, OPT_Wattributes,
2195 "%q+D: visibility attribute ignored because it", newdecl);
2196 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2197 "conflicts with previous declaration here");
2199 /* Choose the declaration which specified visibility. */
2200 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2202 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2203 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2205 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2206 so keep this behavior. */
2207 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2209 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2210 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2212 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2213 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2214 if (TREE_CODE (newdecl) == FIELD_DECL)
2215 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2217 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2218 with that from NEWDECL below. */
2219 if (DECL_LANG_SPECIFIC (olddecl))
2221 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2222 != DECL_LANG_SPECIFIC (newdecl));
2223 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2226 /* Merge the USED information. */
2227 if (TREE_USED (olddecl))
2228 TREE_USED (newdecl) = 1;
2229 else if (TREE_USED (newdecl))
2230 TREE_USED (olddecl) = 1;
2231 if (TREE_CODE (newdecl) == VAR_DECL)
2233 if (DECL_READ_P (olddecl))
2234 DECL_READ_P (newdecl) = 1;
2235 else if (DECL_READ_P (newdecl))
2236 DECL_READ_P (olddecl) = 1;
2238 if (DECL_PRESERVE_P (olddecl))
2239 DECL_PRESERVE_P (newdecl) = 1;
2240 else if (DECL_PRESERVE_P (newdecl))
2241 DECL_PRESERVE_P (olddecl) = 1;
2243 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2247 function_size = sizeof (struct tree_decl_common);
2249 memcpy ((char *) olddecl + sizeof (struct tree_common),
2250 (char *) newdecl + sizeof (struct tree_common),
2251 function_size - sizeof (struct tree_common));
2253 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2254 (char *) newdecl + sizeof (struct tree_decl_common),
2255 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2256 if (new_template_info)
2257 /* If newdecl is a template instantiation, it is possible that
2258 the following sequence of events has occurred:
2260 o A friend function was declared in a class template. The
2261 class template was instantiated.
2263 o The instantiation of the friend declaration was
2264 recorded on the instantiation list, and is newdecl.
2266 o Later, however, instantiate_class_template called pushdecl
2267 on the newdecl to perform name injection. But, pushdecl in
2268 turn called duplicate_decls when it discovered that another
2269 declaration of a global function with the same name already
2272 o Here, in duplicate_decls, we decided to clobber newdecl.
2274 If we're going to do that, we'd better make sure that
2275 olddecl, and not newdecl, is on the list of
2276 instantiations so that if we try to do the instantiation
2277 again we won't get the clobbered declaration. */
2278 reregister_specialization (newdecl,
2284 size_t size = tree_code_size (TREE_CODE (olddecl));
2285 memcpy ((char *) olddecl + sizeof (struct tree_common),
2286 (char *) newdecl + sizeof (struct tree_common),
2287 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2288 switch (TREE_CODE (olddecl))
2298 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2299 (char *) newdecl + sizeof (struct tree_decl_common),
2300 size - sizeof (struct tree_decl_common)
2301 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2305 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2306 (char *) newdecl + sizeof (struct tree_decl_common),
2307 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2308 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2312 DECL_UID (olddecl) = olddecl_uid;
2314 DECL_FRIEND_P (olddecl) = 1;
2317 DECL_ANTICIPATED (olddecl) = 1;
2318 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2321 /* NEWDECL contains the merged attribute lists.
2322 Update OLDDECL to be the same. */
2323 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2325 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2326 so that encode_section_info has a chance to look at the new decl
2327 flags and attributes. */
2328 if (DECL_RTL_SET_P (olddecl)
2329 && (TREE_CODE (olddecl) == FUNCTION_DECL
2330 || (TREE_CODE (olddecl) == VAR_DECL
2331 && TREE_STATIC (olddecl))))
2332 make_decl_rtl (olddecl);
2334 /* The NEWDECL will no longer be needed. Because every out-of-class
2335 declaration of a member results in a call to duplicate_decls,
2336 freeing these nodes represents in a significant savings. */
2342 /* Return zero if the declaration NEWDECL is valid
2343 when the declaration OLDDECL (assumed to be for the same name)
2344 has already been seen.
2345 Otherwise return an error message format string with a %s
2346 where the identifier should go. */
2349 redeclaration_error_message (tree newdecl, tree olddecl)
2351 if (TREE_CODE (newdecl) == TYPE_DECL)
2353 /* Because C++ can put things into name space for free,
2354 constructs like "typedef struct foo { ... } foo"
2355 would look like an erroneous redeclaration. */
2356 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2359 return G_("redefinition of %q#D");
2361 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2363 /* If this is a pure function, its olddecl will actually be
2364 the original initialization to `0' (which we force to call
2365 abort()). Don't complain about redefinition in this case. */
2366 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2367 && DECL_INITIAL (olddecl) == NULL_TREE)
2370 /* If both functions come from different namespaces, this is not
2371 a redeclaration - this is a conflict with a used function. */
2372 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2373 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2374 && ! decls_match (olddecl, newdecl))
2375 return G_("%qD conflicts with used function");
2377 /* We'll complain about linkage mismatches in
2378 warn_extern_redeclared_static. */
2380 /* Defining the same name twice is no good. */
2381 if (DECL_INITIAL (olddecl) != NULL_TREE
2382 && DECL_INITIAL (newdecl) != NULL_TREE)
2384 if (DECL_NAME (olddecl) == NULL_TREE)
2385 return G_("%q#D not declared in class");
2386 else if (!GNU_INLINE_P (olddecl)
2387 || GNU_INLINE_P (newdecl))
2388 return G_("redefinition of %q#D");
2391 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2393 bool olda = GNU_INLINE_P (olddecl);
2394 bool newa = GNU_INLINE_P (newdecl);
2399 return G_("%q+D redeclared inline with "
2400 "%<gnu_inline%> attribute");
2402 return G_("%q+D redeclared inline without "
2403 "%<gnu_inline%> attribute");
2409 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2413 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2415 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2416 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2417 return G_("redefinition of %q#D");
2421 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2422 || (DECL_TEMPLATE_RESULT (newdecl)
2423 == DECL_TEMPLATE_RESULT (olddecl)))
2426 nt = DECL_TEMPLATE_RESULT (newdecl);
2427 if (DECL_TEMPLATE_INFO (nt))
2428 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2429 ot = DECL_TEMPLATE_RESULT (olddecl);
2430 if (DECL_TEMPLATE_INFO (ot))
2431 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2432 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2433 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2434 return G_("redefinition of %q#D");
2436 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2438 bool olda = GNU_INLINE_P (ot);
2439 bool newa = GNU_INLINE_P (nt);
2444 return G_("%q+D redeclared inline with "
2445 "%<gnu_inline%> attribute");
2447 return G_("%q+D redeclared inline without "
2448 "%<gnu_inline%> attribute");
2452 /* Core issue #226 (C++0x):
2454 If a friend function template declaration specifies a
2455 default template-argument, that declaration shall be a
2456 definition and shall be the only declaration of the
2457 function template in the translation unit. */
2458 if ((cxx_dialect != cxx98)
2459 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2460 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2461 /*is_primary=*/1, /*is_partial=*/0,
2462 /*is_friend_decl=*/2))
2463 return G_("redeclaration of friend %q#D "
2464 "may not have default template arguments");
2468 else if (TREE_CODE (newdecl) == VAR_DECL
2469 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2470 && (! DECL_LANG_SPECIFIC (olddecl)
2471 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2472 || DECL_THREAD_LOCAL_P (newdecl)))
2474 /* Only variables can be thread-local, and all declarations must
2475 agree on this property. */
2476 if (DECL_THREAD_LOCAL_P (newdecl))
2477 return G_("thread-local declaration of %q#D follows "
2478 "non-thread-local declaration");
2480 return G_("non-thread-local declaration of %q#D follows "
2481 "thread-local declaration");
2483 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2485 /* The objects have been declared at namespace scope. If either
2486 is a member of an anonymous union, then this is an invalid
2487 redeclaration. For example:
2493 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2494 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2495 return G_("redeclaration of %q#D");
2496 /* If at least one declaration is a reference, there is no
2497 conflict. For example:
2503 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2505 /* Reject two definitions. */
2506 return G_("redefinition of %q#D");
2510 /* Objects declared with block scope: */
2511 /* Reject two definitions, and reject a definition
2512 together with an external reference. */
2513 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2514 return G_("redeclaration of %q#D");
2519 /* Hash and equality functions for the named_label table. */
2522 named_label_entry_hash (const void *data)
2524 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2525 return DECL_UID (ent->label_decl);
2529 named_label_entry_eq (const void *a, const void *b)
2531 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2532 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2533 return ent_a->label_decl == ent_b->label_decl;
2536 /* Create a new label, named ID. */
2539 make_label_decl (tree id, int local_p)
2541 struct named_label_entry *ent;
2545 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2547 DECL_CONTEXT (decl) = current_function_decl;
2548 DECL_MODE (decl) = VOIDmode;
2549 C_DECLARED_LABEL_FLAG (decl) = local_p;
2551 /* Say where one reference is to the label, for the sake of the
2552 error if it is not defined. */
2553 DECL_SOURCE_LOCATION (decl) = input_location;
2555 /* Record the fact that this identifier is bound to this label. */
2556 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2558 /* Create the label htab for the function on demand. */
2560 named_labels = htab_create_ggc (13, named_label_entry_hash,
2561 named_label_entry_eq, NULL);
2563 /* Record this label on the list of labels used in this function.
2564 We do this before calling make_label_decl so that we get the
2565 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2566 ent = ggc_alloc_cleared_named_label_entry ();
2567 ent->label_decl = decl;
2569 slot = htab_find_slot (named_labels, ent, INSERT);
2570 gcc_assert (*slot == NULL);
2576 /* Look for a label named ID in the current function. If one cannot
2577 be found, create one. (We keep track of used, but undefined,
2578 labels, and complain about them at the end of a function.) */
2581 lookup_label_1 (tree id)
2585 /* You can't use labels at global scope. */
2586 if (current_function_decl == NULL_TREE)
2588 error ("label %qE referenced outside of any function", id);
2592 /* See if we've already got this label. */
2593 decl = IDENTIFIER_LABEL_VALUE (id);
2594 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2597 decl = make_label_decl (id, /*local_p=*/0);
2601 /* Wrapper for lookup_label_1. */
2604 lookup_label (tree id)
2607 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2608 ret = lookup_label_1 (id);
2609 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2613 /* Declare a local label named ID. */
2616 declare_local_label (tree id)
2619 cp_label_binding *bind;
2621 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2622 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2623 bind = VEC_safe_push (cp_label_binding, gc,
2624 current_binding_level->shadowed_labels, NULL);
2625 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2627 decl = make_label_decl (id, /*local_p=*/1);
2633 /* Returns nonzero if it is ill-formed to jump past the declaration of
2634 DECL. Returns 2 if it's also a real problem. */
2637 decl_jump_unsafe (tree decl)
2639 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2640 with automatic storage duration is not in scope to a point where it is
2641 in scope is ill-formed unless the variable has scalar type, class type
2642 with a trivial default constructor and a trivial destructor, a
2643 cv-qualified version of one of these types, or an array of one of the
2644 preceding types and is declared without an initializer (8.5). */
2645 tree type = TREE_TYPE (decl);
2647 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2648 || type == error_mark_node)
2651 type = strip_array_types (type);
2653 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2654 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2657 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2663 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2666 identify_goto (tree decl, const location_t *locus)
2669 permerror (input_location, "jump to label %qD", decl);
2671 permerror (input_location, "jump to case label");
2673 permerror (*locus, " from here");
2676 /* Check that a single previously seen jump to a newly defined label
2677 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2678 the jump context; NAMES are the names in scope in LEVEL at the jump
2679 context; LOCUS is the source position of the jump or 0. Returns
2680 true if all is well. */
2683 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2684 bool exited_omp, const location_t *locus)
2686 cp_binding_level *b;
2687 bool identified = false, saw_eh = false, saw_omp = false;
2691 identify_goto (decl, locus);
2692 error (" exits OpenMP structured block");
2693 identified = saw_omp = true;
2696 for (b = current_binding_level; b ; b = b->level_chain)
2698 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2700 for (new_decls = b->names; new_decls != old_decls;
2701 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2702 : TREE_CHAIN (new_decls)))
2704 int problem = decl_jump_unsafe (new_decls);
2710 identify_goto (decl, locus);
2714 error (" crosses initialization of %q+#D", new_decls);
2716 permerror (input_location, " enters scope of %q+#D which has "
2717 "non-trivial destructor", new_decls);
2722 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2726 identify_goto (decl, locus);
2729 if (b->kind == sk_try)
2730 error (" enters try block");
2732 error (" enters catch block");
2735 if (b->kind == sk_omp && !saw_omp)
2739 identify_goto (decl, locus);
2742 error (" enters OpenMP structured block");
2751 check_previous_goto (tree decl, struct named_label_use_entry *use)
2753 check_previous_goto_1 (decl, use->binding_level,
2754 use->names_in_scope, use->in_omp_scope,
2755 &use->o_goto_locus);
2759 check_switch_goto (cp_binding_level* level)
2761 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2764 /* Check that a new jump to a label DECL is OK. Called by
2765 finish_goto_stmt. */
2768 check_goto (tree decl)
2770 struct named_label_entry *ent, dummy;
2771 bool saw_catch = false, identified = false;
2775 /* We can't know where a computed goto is jumping.
2776 So we assume that it's OK. */
2777 if (TREE_CODE (decl) != LABEL_DECL)
2780 /* We didn't record any information about this label when we created it,
2781 and there's not much point since it's trivial to analyze as a return. */
2782 if (decl == cdtor_label)
2785 dummy.label_decl = decl;
2786 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2787 gcc_assert (ent != NULL);
2789 /* If the label hasn't been defined yet, defer checking. */
2790 if (! DECL_INITIAL (decl))
2792 struct named_label_use_entry *new_use;
2794 /* Don't bother creating another use if the last goto had the
2795 same data, and will therefore create the same set of errors. */
2797 && ent->uses->names_in_scope == current_binding_level->names)
2800 new_use = ggc_alloc_named_label_use_entry ();
2801 new_use->binding_level = current_binding_level;
2802 new_use->names_in_scope = current_binding_level->names;
2803 new_use->o_goto_locus = input_location;
2804 new_use->in_omp_scope = false;
2806 new_use->next = ent->uses;
2807 ent->uses = new_use;
2811 if (ent->in_try_scope || ent->in_catch_scope
2812 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2814 permerror (input_location, "jump to label %q+D", decl);
2815 permerror (input_location, " from here");
2819 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2821 int u = decl_jump_unsafe (bad);
2823 if (u > 1 && DECL_ARTIFICIAL (bad))
2825 /* Can't skip init of __exception_info. */
2826 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2830 error (" skips initialization of %q+#D", bad);
2832 permerror (input_location, " enters scope of %q+#D which has "
2833 "non-trivial destructor", bad);
2836 if (ent->in_try_scope)
2837 error (" enters try block");
2838 else if (ent->in_catch_scope && !saw_catch)
2839 error (" enters catch block");
2841 if (ent->in_omp_scope)
2842 error (" enters OpenMP structured block");
2843 else if (flag_openmp)
2845 cp_binding_level *b;
2846 for (b = current_binding_level; b ; b = b->level_chain)
2848 if (b == ent->binding_level)
2850 if (b->kind == sk_omp)
2854 permerror (input_location, "jump to label %q+D", decl);
2855 permerror (input_location, " from here");
2858 error (" exits OpenMP structured block");
2865 /* Check that a return is ok wrt OpenMP structured blocks.
2866 Called by finish_return_stmt. Returns true if all is well. */
2869 check_omp_return (void)
2871 cp_binding_level *b;
2872 for (b = current_binding_level; b ; b = b->level_chain)
2873 if (b->kind == sk_omp)
2875 error ("invalid exit from OpenMP structured block");
2878 else if (b->kind == sk_function_parms)
2883 /* Define a label, specifying the location in the source file.
2884 Return the LABEL_DECL node for the label. */
2887 define_label_1 (location_t location, tree name)
2889 struct named_label_entry *ent, dummy;
2890 cp_binding_level *p;
2893 decl = lookup_label (name);
2895 dummy.label_decl = decl;
2896 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2897 gcc_assert (ent != NULL);
2899 /* After labels, make any new cleanups in the function go into their
2900 own new (temporary) binding contour. */
2901 for (p = current_binding_level;
2902 p->kind != sk_function_parms;
2904 p->more_cleanups_ok = 0;
2906 if (name == get_identifier ("wchar_t"))
2907 permerror (input_location, "label named wchar_t");
2909 if (DECL_INITIAL (decl) != NULL_TREE)
2911 error ("duplicate label %qD", decl);
2912 return error_mark_node;
2916 struct named_label_use_entry *use;
2918 /* Mark label as having been defined. */
2919 DECL_INITIAL (decl) = error_mark_node;
2920 /* Say where in the source. */
2921 DECL_SOURCE_LOCATION (decl) = location;
2923 ent->binding_level = current_binding_level;
2924 ent->names_in_scope = current_binding_level->names;
2926 for (use = ent->uses; use ; use = use->next)
2927 check_previous_goto (decl, use);
2934 /* Wrapper for define_label_1. */
2937 define_label (location_t location, tree name)
2940 timevar_start (TV_NAME_LOOKUP);
2941 ret = define_label_1 (location, name);
2942 timevar_stop (TV_NAME_LOOKUP);
2949 cp_binding_level *level;
2950 struct cp_switch *next;
2951 /* The SWITCH_STMT being built. */
2953 /* A splay-tree mapping the low element of a case range to the high
2954 element, or NULL_TREE if there is no high element. Used to
2955 determine whether or not a new case label duplicates an old case
2956 label. We need a tree, rather than simply a hash table, because
2957 of the GNU case range extension. */
2961 /* A stack of the currently active switch statements. The innermost
2962 switch statement is on the top of the stack. There is no need to
2963 mark the stack for garbage collection because it is only active
2964 during the processing of the body of a function, and we never
2965 collect at that point. */
2967 static struct cp_switch *switch_stack;
2969 /* Called right after a switch-statement condition is parsed.
2970 SWITCH_STMT is the switch statement being parsed. */
2973 push_switch (tree switch_stmt)
2975 struct cp_switch *p = XNEW (struct cp_switch);
2976 p->level = current_binding_level;
2977 p->next = switch_stack;
2978 p->switch_stmt = switch_stmt;
2979 p->cases = splay_tree_new (case_compare, NULL, NULL);
2986 struct cp_switch *cs = switch_stack;
2987 location_t switch_location;
2989 /* Emit warnings as needed. */
2990 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2991 if (!processing_template_decl)
2992 c_do_switch_warnings (cs->cases, switch_location,
2993 SWITCH_STMT_TYPE (cs->switch_stmt),
2994 SWITCH_STMT_COND (cs->switch_stmt));
2996 splay_tree_delete (cs->cases);
2997 switch_stack = switch_stack->next;
3001 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3002 condition. Note that if TYPE and VALUE are already integral we don't
3003 really do the conversion because the language-independent
3004 warning/optimization code will work better that way. */
3007 case_conversion (tree type, tree value)
3009 if (value == NULL_TREE)
3012 if (cxx_dialect >= cxx0x
3013 && (SCOPED_ENUM_P (type)
3014 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3016 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3017 type = type_promotes_to (type);
3018 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3020 return cxx_constant_value (value);
3023 /* Note that we've seen a definition of a case label, and complain if this
3024 is a bad place for one. */
3027 finish_case_label (location_t loc, tree low_value, tree high_value)
3030 cp_binding_level *p;
3033 if (processing_template_decl)
3037 /* For templates, just add the case label; we'll do semantic
3038 analysis at instantiation-time. */
3039 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3040 return add_stmt (build_case_label (low_value, high_value, label));
3043 /* Find the condition on which this switch statement depends. */
3044 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3045 if (cond && TREE_CODE (cond) == TREE_LIST)
3046 cond = TREE_VALUE (cond);
3048 if (!check_switch_goto (switch_stack->level))
3049 return error_mark_node;
3051 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3053 low_value = case_conversion (type, low_value);
3054 high_value = case_conversion (type, high_value);
3056 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3057 low_value, high_value);
3059 /* After labels, make any new cleanups in the function go into their
3060 own new (temporary) binding contour. */
3061 for (p = current_binding_level;
3062 p->kind != sk_function_parms;
3064 p->more_cleanups_ok = 0;
3069 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3072 typename_hash (const void* k)
3075 const_tree const t = (const_tree) k;
3077 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3078 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3083 typedef struct typename_info {
3091 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3092 really of type `typename_info*' */
3095 typename_compare (const void * k1, const void * k2)
3097 const_tree const t1 = (const_tree) k1;
3098 const typename_info *const t2 = (const typename_info *) k2;
3100 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3101 && TYPE_CONTEXT (t1) == t2->scope
3102 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3103 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3104 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3107 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3108 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3110 Returns the new TYPENAME_TYPE. */
3112 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3115 build_typename_type (tree context, tree name, tree fullname,
3116 enum tag_types tag_type)
3124 if (typename_htab == NULL)
3125 typename_htab = htab_create_ggc (61, &typename_hash,
3126 &typename_compare, NULL);
3128 ti.scope = FROB_CONTEXT (context);
3130 ti.template_id = fullname;
3131 ti.enum_p = tag_type == enum_type;
3132 ti.class_p = (tag_type == class_type
3133 || tag_type == record_type
3134 || tag_type == union_type);
3135 hash = (htab_hash_pointer (ti.scope)
3136 ^ htab_hash_pointer (ti.name));
3138 /* See if we already have this type. */
3139 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3144 /* Build the TYPENAME_TYPE. */
3145 t = cxx_make_type (TYPENAME_TYPE);
3146 TYPE_CONTEXT (t) = ti.scope;
3147 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3148 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3149 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3151 /* Build the corresponding TYPE_DECL. */
3152 d = build_decl (input_location, TYPE_DECL, name, t);
3153 TYPE_NAME (TREE_TYPE (d)) = d;
3154 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3155 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3156 DECL_ARTIFICIAL (d) = 1;
3158 /* Store it in the hash table. */
3161 /* TYPENAME_TYPEs must always be compared structurally, because
3162 they may or may not resolve down to another type depending on
3163 the currently open classes. */
3164 SET_TYPE_STRUCTURAL_EQUALITY (t);
3170 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3171 provided to name the type. Returns an appropriate type, unless an
3172 error occurs, in which case error_mark_node is returned. If we
3173 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3174 return that, rather than the _TYPE it corresponds to, in other
3175 cases we look through the type decl. If TF_ERROR is set, complain
3176 about errors, otherwise be quiet. */
3179 make_typename_type (tree context, tree name, enum tag_types tag_type,
3180 tsubst_flags_t complain)
3186 if (name == error_mark_node
3187 || context == NULL_TREE
3188 || context == error_mark_node)
3189 return error_mark_node;
3193 if (!(TYPE_LANG_SPECIFIC (name)
3194 && (CLASSTYPE_IS_TEMPLATE (name)
3195 || CLASSTYPE_USE_TEMPLATE (name))))
3196 name = TYPE_IDENTIFIER (name);
3198 /* Create a TEMPLATE_ID_EXPR for the type. */
3199 name = build_nt (TEMPLATE_ID_EXPR,
3200 CLASSTYPE_TI_TEMPLATE (name),
3201 CLASSTYPE_TI_ARGS (name));
3203 else if (TREE_CODE (name) == TYPE_DECL)
3204 name = DECL_NAME (name);
3208 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3210 name = TREE_OPERAND (name, 0);
3211 if (TREE_CODE (name) == TEMPLATE_DECL)
3212 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3213 else if (TREE_CODE (name) == OVERLOAD)
3215 error ("%qD is not a type", name);
3216 return error_mark_node;
3219 if (TREE_CODE (name) == TEMPLATE_DECL)
3221 error ("%qD used without template parameters", name);
3222 return error_mark_node;
3224 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3225 gcc_assert (TYPE_P (context));
3227 if (!MAYBE_CLASS_TYPE_P (context))
3229 if (complain & tf_error)
3230 error ("%q#T is not a class", context);
3231 return error_mark_node;
3234 /* When the CONTEXT is a dependent type, NAME could refer to a
3235 dependent base class of CONTEXT. But look inside it anyway
3236 if CONTEXT is a currently open scope, in case it refers to a
3237 member of the current instantiation or a non-dependent base;
3238 lookup will stop when we hit a dependent base. */
3239 if (!dependent_scope_p (context))
3240 /* We should only set WANT_TYPE when we're a nested typename type.
3241 Then we can give better diagnostics if we find a non-type. */
3242 t = lookup_field (context, name, 2, /*want_type=*/true);
3246 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3247 return build_typename_type (context, name, fullname, tag_type);
3249 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3253 if (complain & tf_error)
3254 error (want_template ? G_("no class template named %q#T in %q#T")
3255 : G_("no type named %q#T in %q#T"), name, context);
3256 return error_mark_node;
3259 /* Pull out the template from an injected-class-name (or multiple). */
3261 t = maybe_get_template_decl_from_type_decl (t);
3263 if (TREE_CODE (t) == TREE_LIST)
3265 if (complain & tf_error)
3267 error ("lookup of %qT in %qT is ambiguous", name, context);
3268 print_candidates (t);
3270 return error_mark_node;
3273 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3275 if (complain & tf_error)
3276 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3278 return error_mark_node;
3280 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3282 if (complain & tf_error)
3283 error ("%<typename %T::%D%> names %q#T, which is not a type",
3285 return error_mark_node;
3288 if (complain & tf_error)
3289 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3291 /* If we are currently parsing a template and if T is a typedef accessed
3292 through CONTEXT then we need to remember and check access of T at
3293 template instantiation time. */
3294 add_typedef_to_current_template_for_access_check (t, context, input_location);
3297 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3299 /*entering_scope=*/0,
3300 tf_warning_or_error | tf_user);
3302 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3308 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3309 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3310 in which case error_mark_node is returned.
3312 If PARM_LIST is non-NULL, also make sure that the template parameter
3313 list of TEMPLATE_DECL matches.
3315 If COMPLAIN zero, don't complain about any errors that occur. */
3318 make_unbound_class_template (tree context, tree name, tree parm_list,
3319 tsubst_flags_t complain)
3325 name = TYPE_IDENTIFIER (name);
3326 else if (DECL_P (name))
3327 name = DECL_NAME (name);
3328 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3330 if (!dependent_type_p (context)
3331 || currently_open_class (context))
3333 tree tmpl = NULL_TREE;
3335 if (MAYBE_CLASS_TYPE_P (context))
3336 tmpl = lookup_field (context, name, 0, false);
3338 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3339 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3341 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3343 if (complain & tf_error)
3344 error ("no class template named %q#T in %q#T", name, context);
3345 return error_mark_node;
3349 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3351 if (complain & tf_error)
3353 error ("template parameters do not match template");
3354 error ("%q+D declared here", tmpl);
3356 return error_mark_node;
3359 if (complain & tf_error)
3360 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3365 /* Build the UNBOUND_CLASS_TEMPLATE. */
3366 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3367 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3368 TREE_TYPE (t) = NULL_TREE;
3369 SET_TYPE_STRUCTURAL_EQUALITY (t);
3371 /* Build the corresponding TEMPLATE_DECL. */
3372 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3373 TYPE_NAME (TREE_TYPE (d)) = d;
3374 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3375 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3376 DECL_ARTIFICIAL (d) = 1;
3377 DECL_TEMPLATE_PARMS (d) = parm_list;
3384 /* Push the declarations of builtin types into the namespace.
3385 RID_INDEX is the index of the builtin type in the array
3386 RID_POINTERS. NAME is the name used when looking up the builtin
3387 type. TYPE is the _TYPE node for the builtin type. */
3390 record_builtin_type (enum rid rid_index,
3394 tree rname = NULL_TREE, tname = NULL_TREE;
3395 tree tdecl = NULL_TREE;
3397 if ((int) rid_index < (int) RID_MAX)
3398 rname = ridpointers[(int) rid_index];
3400 tname = get_identifier (name);
3402 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3403 eliminated. Built-in types should not be looked up name; their
3404 names are keywords that the parser can recognize. However, there
3405 is code in c-common.c that uses identifier_global_value to look
3406 up built-in types by name. */
3409 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3410 DECL_ARTIFICIAL (tdecl) = 1;
3411 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3417 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3418 DECL_ARTIFICIAL (tdecl) = 1;
3420 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3423 if (!TYPE_NAME (type))
3424 TYPE_NAME (type) = tdecl;
3427 debug_hooks->type_decl (tdecl, 0);
3430 /* Record one of the standard Java types.
3431 * Declare it as having the given NAME.
3432 * If SIZE > 0, it is the size of one of the integral types;
3433 * otherwise it is the negative of the size of one of the other types. */
3436 record_builtin_java_type (const char* name, int size)
3441 type = build_nonstandard_integer_type (size, 0);
3442 type = build_distinct_type_copy (type);
3444 else if (size > -32)
3447 /* "__java_char" or ""__java_boolean". */
3448 type = build_nonstandard_integer_type (-size, 1);
3449 type = build_distinct_type_copy (type);
3450 /* Get the signed type cached and attached to the unsigned type,
3451 so it doesn't get garbage-collected at "random" times,
3452 causing potential codegen differences out of different UIDs
3453 and different alias set numbers. */
3454 stype = build_nonstandard_integer_type (-size, 0);
3455 stype = build_distinct_type_copy (stype);
3456 TREE_CHAIN (type) = stype;
3457 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3460 { /* "__java_float" or ""__java_double". */
3461 type = make_node (REAL_TYPE);
3462 TYPE_PRECISION (type) = - size;
3465 record_builtin_type (RID_MAX, name, type);
3466 decl = TYPE_NAME (type);
3468 /* Suppress generate debug symbol entries for these types,
3469 since for normal C++ they are just clutter.
3470 However, push_lang_context undoes this if extern "Java" is seen. */
3471 DECL_IGNORED_P (decl) = 1;
3473 TYPE_FOR_JAVA (type) = 1;
3477 /* Push a type into the namespace so that the back ends ignore it. */
3480 record_unknown_type (tree type, const char* name)
3482 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3483 TYPE_DECL, get_identifier (name), type));
3484 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3485 DECL_IGNORED_P (decl) = 1;
3486 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3487 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3488 TYPE_ALIGN (type) = 1;
3489 TYPE_USER_ALIGN (type) = 0;
3490 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3493 /* A string for which we should create an IDENTIFIER_NODE at
3496 typedef struct predefined_identifier
3498 /* The name of the identifier. */
3499 const char *const name;
3500 /* The place where the IDENTIFIER_NODE should be stored. */
3502 /* Nonzero if this is the name of a constructor or destructor. */
3503 const int ctor_or_dtor_p;
3504 } predefined_identifier;
3506 /* Create all the predefined identifiers. */
3509 initialize_predefined_identifiers (void)
3511 const predefined_identifier *pid;
3513 /* A table of identifiers to create at startup. */
3514 static const predefined_identifier predefined_identifiers[] = {
3515 { "C++", &lang_name_cplusplus, 0 },
3516 { "C", &lang_name_c, 0 },
3517 { "Java", &lang_name_java, 0 },
3518 /* Some of these names have a trailing space so that it is
3519 impossible for them to conflict with names written by users. */
3520 { "__ct ", &ctor_identifier, 1 },
3521 { "__base_ctor ", &base_ctor_identifier, 1 },
3522 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3523 { "__dt ", &dtor_identifier, 1 },
3524 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3525 { "__base_dtor ", &base_dtor_identifier, 1 },
3526 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3527 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3528 { "nelts", &nelts_identifier, 0 },
3529 { THIS_NAME, &this_identifier, 0 },
3530 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3531 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3532 { "_vptr", &vptr_identifier, 0 },
3533 { "__vtt_parm", &vtt_parm_identifier, 0 },
3534 { "::", &global_scope_name, 0 },
3535 { "std", &std_identifier, 0 },
3539 for (pid = predefined_identifiers; pid->name; ++pid)
3541 *pid->node = get_identifier (pid->name);
3542 if (pid->ctor_or_dtor_p)
3543 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3547 /* Create the predefined scalar types of C,
3548 and some nodes representing standard constants (0, 1, (void *)0).
3549 Initialize the global binding level.
3550 Make definitions for built-in primitive functions. */
3553 cxx_init_decl_processing (void)
3556 tree void_ftype_ptr;
3558 /* Create all the identifiers we need. */
3559 initialize_predefined_identifiers ();
3561 /* Create the global variables. */
3562 push_to_top_level ();
3564 current_function_decl = NULL_TREE;
3565 current_binding_level = NULL;
3566 /* Enter the global namespace. */
3567 gcc_assert (global_namespace == NULL_TREE);
3568 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3570 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3571 TREE_PUBLIC (global_namespace) = 1;
3572 begin_scope (sk_namespace, global_namespace);
3574 if (flag_visibility_ms_compat)
3575 default_visibility = VISIBILITY_HIDDEN;
3578 current_lang_name = lang_name_c;
3580 /* Create the `std' namespace. */
3581 push_namespace (std_identifier);
3582 std_node = current_namespace;
3585 c_common_nodes_and_builtins ();
3587 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3588 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3589 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3590 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3591 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3592 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3593 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3594 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3596 integer_two_node = build_int_cst (NULL_TREE, 2);
3598 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3599 truthvalue_type_node = boolean_type_node;
3600 truthvalue_false_node = boolean_false_node;
3601 truthvalue_true_node = boolean_true_node;
3603 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3604 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3605 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3608 record_builtin_type (RID_MAX, NULL, string_type_node);
3611 delta_type_node = ptrdiff_type_node;
3612 vtable_index_type = ptrdiff_type_node;
3614 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3615 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3616 void_ftype_ptr = build_function_type_list (void_type_node,
3617 ptr_type_node, NULL_TREE);
3619 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3621 /* C++ extensions */
3623 unknown_type_node = make_node (LANG_TYPE);
3624 record_unknown_type (unknown_type_node, "unknown type");
3626 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3627 TREE_TYPE (unknown_type_node) = unknown_type_node;
3629 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3631 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3632 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3634 init_list_type_node = make_node (LANG_TYPE);
3635 record_unknown_type (init_list_type_node, "init list");
3637 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3638 record_unknown_type (dependent_lambda_return_type_node,
3639 "undeduced lambda return type");
3642 /* Make sure we get a unique function type, so we can give
3643 its pointer type a name. (This wins for gdb.) */
3644 tree vfunc_type = make_node (FUNCTION_TYPE);
3645 TREE_TYPE (vfunc_type) = integer_type_node;
3646 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3647 layout_type (vfunc_type);
3649 vtable_entry_type = build_pointer_type (vfunc_type);
3651 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3654 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3655 layout_type (vtbl_type_node);
3656 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3657 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3658 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3659 layout_type (vtbl_ptr_type_node);
3660 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3662 push_namespace (get_identifier ("__cxxabiv1"));
3663 abi_node = current_namespace;
3666 global_type_node = make_node (LANG_TYPE);
3667 record_unknown_type (global_type_node, "global type");
3670 current_lang_name = lang_name_cplusplus;
3673 tree newattrs, extvisattr;
3674 tree newtype, deltype;
3675 tree ptr_ftype_sizetype;
3679 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3680 if (cxx_dialect == cxx98)
3683 tree bad_alloc_type_node;
3684 tree bad_alloc_decl;
3686 push_namespace (std_identifier);
3687 bad_alloc_id = get_identifier ("bad_alloc");
3688 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3689 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3691 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3692 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3696 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3699 new_eh_spec = noexcept_false_spec;
3701 /* Ensure attribs.c is initialized. */
3703 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3705 newattrs = tree_cons (get_identifier ("alloc_size"),
3706 build_tree_list (NULL_TREE, integer_one_node),
3708 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3709 newtype = build_exception_variant (newtype, new_eh_spec);
3710 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3711 deltype = build_exception_variant (deltype, empty_except_spec);
3712 push_cp_library_fn (NEW_EXPR, newtype);
3713 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3714 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3715 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3717 nullptr_type_node = make_node (NULLPTR_TYPE);
3718 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3719 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3720 TYPE_UNSIGNED (nullptr_type_node) = 1;
3721 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3722 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3723 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3724 nullptr_node = build_int_cst (nullptr_type_node, 0);
3728 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3730 /* Perform other language dependent initializations. */
3731 init_class_processing ();
3732 init_rtti_processing ();
3733 init_template_processing ();
3735 if (flag_exceptions)
3736 init_exception_processing ();
3738 if (! supports_one_only ())
3741 make_fname_decl = cp_make_fname_decl;
3742 start_fname_decls ();
3744 /* Show we use EH for cleanups. */
3745 if (flag_exceptions)
3746 using_eh_for_cleanups ();
3749 /* Generate an initializer for a function naming variable from
3750 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3751 filled in with the type of the init. */
3754 cp_fname_init (const char* name, tree *type_p)
3756 tree domain = NULL_TREE;
3758 tree init = NULL_TREE;
3763 length = strlen (name);
3764 domain = build_index_type (size_int (length));
3765 init = build_string (length + 1, name);
3768 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3769 type = build_cplus_array_type (type, domain);
3774 TREE_TYPE (init) = type;
3776 init = error_mark_node;
3781 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3782 the decl, LOC is the location to give the decl, NAME is the
3783 initialization string and TYPE_DEP indicates whether NAME depended
3784 on the type of the function. We make use of that to detect
3785 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3786 at the point of first use, so we mustn't push the decl now. */
3789 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3791 const char *const name = (type_dep && processing_template_decl
3792 ? NULL : fname_as_string (type_dep));
3794 tree init = cp_fname_init (name, &type);
3795 tree decl = build_decl (loc, VAR_DECL, id, type);
3798 free (CONST_CAST (char *, name));
3800 /* As we're using pushdecl_with_scope, we must set the context. */
3801 DECL_CONTEXT (decl) = current_function_decl;
3802 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3804 TREE_STATIC (decl) = 1;
3805 TREE_READONLY (decl) = 1;
3806 DECL_ARTIFICIAL (decl) = 1;
3808 TREE_USED (decl) = 1;
3810 if (current_function_decl)
3812 cp_binding_level *b = current_binding_level;
3813 if (b->kind == sk_function_parms)
3814 return error_mark_node;
3815 while (b->level_chain->kind != sk_function_parms)
3817 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3818 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3819 LOOKUP_ONLYCONVERTING);
3823 DECL_THIS_STATIC (decl) = true;
3824 pushdecl_top_level_and_finish (decl, init);
3831 builtin_function_1 (tree decl, tree context, bool is_global)
3833 tree id = DECL_NAME (decl);
3834 const char *name = IDENTIFIER_POINTER (id);
3836 retrofit_lang_decl (decl);
3838 DECL_ARTIFICIAL (decl) = 1;
3839 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3840 SET_DECL_LANGUAGE (decl, lang_c);
3841 /* Runtime library routines are, by definition, available in an
3842 external shared object. */
3843 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3844 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3846 DECL_CONTEXT (decl) = context;
3849 pushdecl_top_level (decl);
3853 /* A function in the user's namespace should have an explicit
3854 declaration before it is used. Mark the built-in function as
3855 anticipated but not actually declared. */
3856 if (name[0] != '_' || name[1] != '_')
3857 DECL_ANTICIPATED (decl) = 1;
3858 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3860 size_t len = strlen (name);
3862 /* Treat __*_chk fortification functions as anticipated as well,
3863 unless they are __builtin_*. */
3864 if (len > strlen ("___chk")
3865 && memcmp (name + len - strlen ("_chk"),
3866 "_chk", strlen ("_chk") + 1) == 0)
3867 DECL_ANTICIPATED (decl) = 1;
3874 cxx_builtin_function (tree decl)
3876 tree id = DECL_NAME (decl);
3877 const char *name = IDENTIFIER_POINTER (id);
3878 /* All builtins that don't begin with an '_' should additionally
3879 go in the 'std' namespace. */
3882 tree decl2 = copy_node(decl);
3883 push_namespace (std_identifier);
3884 builtin_function_1 (decl2, std_node, false);
3888 return builtin_function_1 (decl, NULL_TREE, false);
3891 /* Like cxx_builtin_function, but guarantee the function is added to the global
3892 scope. This is to allow function specific options to add new machine
3893 dependent builtins when the target ISA changes via attribute((target(...)))
3894 which saves space on program startup if the program does not use non-generic
3898 cxx_builtin_function_ext_scope (tree decl)
3901 tree id = DECL_NAME (decl);
3902 const char *name = IDENTIFIER_POINTER (id);
3903 /* All builtins that don't begin with an '_' should additionally
3904 go in the 'std' namespace. */
3907 tree decl2 = copy_node(decl);
3908 push_namespace (std_identifier);
3909 builtin_function_1 (decl2, std_node, true);
3913 return builtin_function_1 (decl, NULL_TREE, true);
3916 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3917 function. Not called directly. */
3920 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3922 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3923 DECL_EXTERNAL (fn) = 1;
3924 TREE_PUBLIC (fn) = 1;
3925 DECL_ARTIFICIAL (fn) = 1;
3926 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3927 SET_DECL_LANGUAGE (fn, lang_c);
3928 /* Runtime library routines are, by definition, available in an
3929 external shared object. */
3930 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3931 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3935 /* Returns the _DECL for a library function with C linkage.
3936 We assume that such functions never throw; if this is incorrect,
3937 callers should unset TREE_NOTHROW. */
3940 build_library_fn (tree name, tree type)
3942 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3943 TREE_NOTHROW (fn) = 1;
3947 /* Returns the _DECL for a library function with C++ linkage. */
3950 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3952 tree fn = build_library_fn_1 (name, operator_code, type);
3953 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3954 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3955 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3959 /* Like build_library_fn, but takes a C string instead of an
3963 build_library_fn_ptr (const char* name, tree type)
3965 return build_library_fn (get_identifier (name), type);
3968 /* Like build_cp_library_fn, but takes a C string instead of an
3972 build_cp_library_fn_ptr (const char* name, tree type)
3974 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3977 /* Like build_library_fn, but also pushes the function so that we will
3978 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3979 may throw exceptions listed in RAISES. */
3982 push_library_fn (tree name, tree type, tree raises)
3987 type = build_exception_variant (type, raises);
3989 fn = build_library_fn (name, type);
3990 pushdecl_top_level (fn);
3994 /* Like build_cp_library_fn, but also pushes the function so that it
3995 will be found by normal lookup. */
3998 push_cp_library_fn (enum tree_code operator_code, tree type)
4000 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4007 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4011 push_void_library_fn (tree name, tree parmtypes)
4013 tree type = build_function_type (void_type_node, parmtypes);
4014 return push_library_fn (name, type, NULL_TREE);
4017 /* Like push_library_fn, but also note that this function throws
4018 and does not return. Used for __throw_foo and the like. */
4021 push_throw_library_fn (tree name, tree type)
4023 tree fn = push_library_fn (name, type, NULL_TREE);
4024 TREE_THIS_VOLATILE (fn) = 1;
4025 TREE_NOTHROW (fn) = 0;
4029 /* When we call finish_struct for an anonymous union, we create
4030 default copy constructors and such. But, an anonymous union
4031 shouldn't have such things; this function undoes the damage to the
4032 anonymous union type T.
4034 (The reason that we create the synthesized methods is that we don't
4035 distinguish `union { int i; }' from `typedef union { int i; } U'.
4036 The first is an anonymous union; the second is just an ordinary
4040 fixup_anonymous_aggr (tree t)
4044 /* Wipe out memory of synthesized methods. */
4045 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4046 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4047 TYPE_HAS_COPY_CTOR (t) = 0;
4048 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4049 TYPE_HAS_COPY_ASSIGN (t) = 0;
4050 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4052 /* Splice the implicitly generated functions out of the TYPE_METHODS
4054 q = &TYPE_METHODS (t);
4057 if (DECL_ARTIFICIAL (*q))
4058 *q = TREE_CHAIN (*q);
4060 q = &DECL_CHAIN (*q);
4063 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4064 if (TYPE_METHODS (t))
4066 tree decl = TYPE_MAIN_DECL (t);
4068 if (TREE_CODE (t) != UNION_TYPE)
4069 error_at (DECL_SOURCE_LOCATION (decl),
4070 "an anonymous struct cannot have function members");
4072 error_at (DECL_SOURCE_LOCATION (decl),
4073 "an anonymous union cannot have function members");
4076 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4077 assignment operators (because they cannot have these methods themselves).
4078 For anonymous unions this is already checked because they are not allowed
4079 in any union, otherwise we have to check it. */
4080 if (TREE_CODE (t) != UNION_TYPE)
4084 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4085 if (TREE_CODE (field) == FIELD_DECL)
4087 type = TREE_TYPE (field);
4088 if (CLASS_TYPE_P (type))
4090 if (TYPE_NEEDS_CONSTRUCTING (type))
4091 error ("member %q+#D with constructor not allowed "
4092 "in anonymous aggregate", field);
4093 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4094 error ("member %q+#D with destructor not allowed "
4095 "in anonymous aggregate", field);
4096 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4097 error ("member %q+#D with copy assignment operator "
4098 "not allowed in anonymous aggregate", field);
4104 /* Make sure that a declaration with no declarator is well-formed, i.e.
4105 just declares a tagged type or anonymous union.
4107 Returns the type declared; or NULL_TREE if none. */
4110 check_tag_decl (cp_decl_specifier_seq *declspecs)
4112 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4113 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4114 /* If a class, struct, or enum type is declared by the DECLSPECS
4115 (i.e, if a class-specifier, enum-specifier, or non-typename
4116 elaborated-type-specifier appears in the DECLSPECS),
4117 DECLARED_TYPE is set to the corresponding type. */
4118 tree declared_type = NULL_TREE;
4119 bool error_p = false;
4121 if (declspecs->multiple_types_p)
4122 error ("multiple types in one declaration");
4123 else if (declspecs->redefined_builtin_type)
4125 if (!in_system_header)
4126 permerror (input_location, "redeclaration of C++ built-in type %qT",
4127 declspecs->redefined_builtin_type);
4132 && TYPE_P (declspecs->type)
4133 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4134 && MAYBE_CLASS_TYPE_P (declspecs->type))
4135 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4136 declared_type = declspecs->type;
4137 else if (declspecs->type == error_mark_node)
4139 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4140 permerror (input_location, "declaration does not declare anything");
4141 /* Check for an anonymous union. */
4142 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4143 && TYPE_ANONYMOUS_P (declared_type))
4145 /* 7/3 In a simple-declaration, the optional init-declarator-list
4146 can be omitted only when declaring a class (clause 9) or
4147 enumeration (7.2), that is, when the decl-specifier-seq contains
4148 either a class-specifier, an elaborated-type-specifier with
4149 a class-key (9.1), or an enum-specifier. In these cases and
4150 whenever a class-specifier or enum-specifier is present in the
4151 decl-specifier-seq, the identifiers in these specifiers are among
4152 the names being declared by the declaration (as class-name,
4153 enum-names, or enumerators, depending on the syntax). In such
4154 cases, and except for the declaration of an unnamed bit-field (9.6),
4155 the decl-specifier-seq shall introduce one or more names into the
4156 program, or shall redeclare a name introduced by a previous
4157 declaration. [Example:
4158 enum { }; // ill-formed
4159 typedef class { }; // ill-formed
4163 error ("missing type-name in typedef-declaration");
4166 /* Anonymous unions are objects, so they can have specifiers. */;
4167 SET_ANON_AGGR_TYPE_P (declared_type);
4169 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4170 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4175 if (declspecs->specs[(int)ds_inline]
4176 || declspecs->specs[(int)ds_virtual])
4177 error ("%qs can only be specified for functions",
4178 declspecs->specs[(int)ds_inline]
4179 ? "inline" : "virtual");
4181 && (!current_class_type
4182 || current_scope () != current_class_type))
4183 error ("%<friend%> can only be specified inside a class");
4184 else if (declspecs->specs[(int)ds_explicit])
4185 error ("%<explicit%> can only be specified for constructors");
4186 else if (declspecs->storage_class)
4187 error ("a storage class can only be specified for objects "
4189 else if (declspecs->specs[(int)ds_const]
4190 || declspecs->specs[(int)ds_volatile]
4191 || declspecs->specs[(int)ds_restrict]
4192 || declspecs->specs[(int)ds_thread])
4193 error ("qualifiers can only be specified for objects "
4195 else if (saw_typedef)
4196 warning (0, "%<typedef%> was ignored in this declaration");
4197 else if (declspecs->specs[(int) ds_constexpr])
4198 error ("%<constexpr%> cannot be used for type declarations");
4201 return declared_type;
4204 /* Called when a declaration is seen that contains no names to declare.
4205 If its type is a reference to a structure, union or enum inherited
4206 from a containing scope, shadow that tag name for the current scope
4207 with a forward reference.
4208 If its type defines a new named structure or union
4209 or defines an enum, it is valid but we need not do anything here.
4210 Otherwise, it is an error.
4212 C++: may have to grok the declspecs to learn about static,
4213 complain for anonymous unions.
4215 Returns the TYPE declared -- or NULL_TREE if none. */
4218 shadow_tag (cp_decl_specifier_seq *declspecs)
4220 tree t = check_tag_decl (declspecs);
4225 if (declspecs->attributes)
4227 warning (0, "attribute ignored in declaration of %q+#T", t);
4228 warning (0, "attribute for %q+#T must follow the %qs keyword",
4229 t, class_key_or_enum_as_string (t));
4233 if (maybe_process_partial_specialization (t) == error_mark_node)
4236 /* This is where the variables in an anonymous union are
4237 declared. An anonymous union declaration looks like:
4239 because there is no declarator after the union, the parser
4240 sends that declaration here. */
4241 if (ANON_AGGR_TYPE_P (t))
4243 fixup_anonymous_aggr (t);
4245 if (TYPE_FIELDS (t))
4247 tree decl = grokdeclarator (/*declarator=*/NULL,
4248 declspecs, NORMAL, 0, NULL);
4249 finish_anon_union (decl);
4256 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4259 groktypename (cp_decl_specifier_seq *type_specifiers,
4260 const cp_declarator *declarator,
4261 bool is_template_arg)
4265 enum decl_context context
4266 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4267 attrs = type_specifiers->attributes;
4268 type_specifiers->attributes = NULL_TREE;
4269 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4270 if (attrs && type != error_mark_node)
4272 if (CLASS_TYPE_P (type))
4273 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4274 "outside of definition", type);
4275 else if (MAYBE_CLASS_TYPE_P (type))
4276 /* A template type parameter or other dependent type. */
4277 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4278 "type %qT without an associated declaration", type);
4280 cplus_decl_attributes (&type, attrs, 0);
4285 /* Process a DECLARATOR for a function-scope variable declaration,
4286 namespace-scope variable declaration, or function declaration.
4287 (Function definitions go through start_function; class member
4288 declarations appearing in the body of the class go through
4289 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4290 If an error occurs, the error_mark_node is returned instead.
4292 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4293 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4294 for an explicitly defaulted function, or SD_DELETED for an explicitly
4295 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4296 implicitly initialized via a default constructor. ATTRIBUTES and
4297 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4298 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4299 set, the caller is responsible for calling pop_scope. */
4302 start_decl (const cp_declarator *declarator,
4303 cp_decl_specifier_seq *declspecs,
4306 tree prefix_attributes,
4307 tree *pushed_scope_p)
4315 *pushed_scope_p = NULL_TREE;
4317 /* An object declared as __attribute__((deprecated)) suppresses
4318 warnings of uses of other deprecated items. */
4319 if (lookup_attribute ("deprecated", attributes))
4320 deprecated_state = DEPRECATED_SUPPRESS;
4322 attributes = chainon (attributes, prefix_attributes);
4324 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4327 deprecated_state = DEPRECATED_NORMAL;
4329 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4330 || decl == error_mark_node)
4331 return error_mark_node;
4333 context = CP_DECL_CONTEXT (decl);
4334 if (context != global_namespace)
4335 *pushed_scope_p = push_scope (context);
4338 /* Is it valid for this decl to have an initializer at all?
4339 If not, set INITIALIZED to zero, which will indirectly
4340 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4341 switch (TREE_CODE (decl))
4344 error ("typedef %qD is initialized (use decltype instead)", decl);
4345 return error_mark_node;
4348 if (initialized == SD_DELETED)
4349 /* We'll handle the rest of the semantics later, but we need to
4350 set this now so it's visible to duplicate_decls. */
4351 DECL_DELETED_FN (decl) = 1;
4360 if (! toplevel_bindings_p ()
4361 && DECL_EXTERNAL (decl))
4362 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4364 DECL_EXTERNAL (decl) = 0;
4365 if (toplevel_bindings_p ())
4366 TREE_STATIC (decl) = 1;
4368 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4370 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4371 record_key_method_defined (decl);
4373 /* If this is a typedef that names the class for linkage purposes
4374 (7.1.3p8), apply any attributes directly to the type. */
4375 if (TREE_CODE (decl) == TYPE_DECL
4376 && TAGGED_TYPE_P (TREE_TYPE (decl))
4377 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4378 flags = ATTR_FLAG_TYPE_IN_PLACE;
4382 /* Set attributes here so if duplicate decl, will have proper attributes. */
4383 cplus_decl_attributes (&decl, attributes, flags);
4385 /* Dllimported symbols cannot be defined. Static data members (which
4386 can be initialized in-class and dllimported) go through grokfield,
4387 not here, so we don't need to exclude those decls when checking for
4389 if (initialized && DECL_DLLIMPORT_P (decl))
4391 error ("definition of %q#D is marked %<dllimport%>", decl);
4392 DECL_DLLIMPORT_P (decl) = 0;
4395 /* If #pragma weak was used, mark the decl weak now. */
4396 maybe_apply_pragma_weak (decl);
4398 if (TREE_CODE (decl) == FUNCTION_DECL
4399 && DECL_DECLARED_INLINE_P (decl)
4400 && DECL_UNINLINABLE (decl)
4401 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4402 warning (0, "inline function %q+D given attribute noinline", decl);
4404 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4406 if (TREE_CODE (decl) == VAR_DECL)
4408 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4409 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4410 error ("%q#D is not a static member of %q#T", decl, context);
4413 if (DECL_CONTEXT (field) != context)
4415 if (!same_type_p (DECL_CONTEXT (field), context))
4416 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4417 "to be defined as %<%T::%D%>",
4418 DECL_CONTEXT (field), DECL_NAME (decl),
4419 context, DECL_NAME (decl));
4420 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4422 if (processing_specialization
4423 && template_class_depth (context) == 0
4424 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4425 error ("template header not allowed in member definition "
4426 "of explicitly specialized class");
4427 /* Static data member are tricky; an in-class initialization
4428 still doesn't provide a definition, so the in-class
4429 declaration will have DECL_EXTERNAL set, but will have an
4430 initialization. Thus, duplicate_decls won't warn
4431 about this situation, and so we check here. */
4432 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4433 error ("duplicate initialization of %qD", decl);
4434 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4436 if (declspecs->specs[(int) ds_constexpr]
4437 && !DECL_DECLARED_CONSTEXPR_P (field))
4438 error ("%qD declared %<constexpr%> outside its class", field);
4443 tree field = check_classfn (context, decl,
4444 (processing_template_decl
4445 > template_class_depth (context))
4446 ? current_template_parms
4448 if (field && field != error_mark_node
4449 && duplicate_decls (decl, field,
4450 /*newdecl_is_friend=*/false))
4454 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4455 DECL_IN_AGGR_P (decl) = 0;
4456 /* Do not mark DECL as an explicit specialization if it was not
4457 already marked as an instantiation; a declaration should
4458 never be marked as a specialization unless we know what
4459 template is being specialized. */
4460 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4462 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4464 /* [temp.expl.spec] An explicit specialization of a static data
4465 member of a template is a definition if the declaration
4466 includes an initializer; otherwise, it is a declaration.
4468 We check for processing_specialization so this only applies
4469 to the new specialization syntax. */
4470 if (!initialized && processing_specialization)
4471 DECL_EXTERNAL (decl) = 1;
4474 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4475 /* Aliases are definitions. */
4477 permerror (input_location, "declaration of %q#D outside of class is not definition",
4481 was_public = TREE_PUBLIC (decl);
4483 /* Enter this declaration into the symbol table. */
4484 decl = maybe_push_decl (decl);
4486 if (processing_template_decl)
4487 decl = push_template_decl (decl);
4488 if (decl == error_mark_node)
4489 return error_mark_node;
4491 /* Tell the back end to use or not use .common as appropriate. If we say
4492 -fconserve-space, we want this to save .data space, at the expense of
4493 wrong semantics. If we say -fno-conserve-space, we want this to
4494 produce errors about redefs; to do this we force variables into the
4496 if (flag_conserve_space
4497 && TREE_CODE (decl) == VAR_DECL
4498 && TREE_PUBLIC (decl)
4499 && !DECL_THREAD_LOCAL_P (decl)
4500 && !have_global_bss_p ())
4501 DECL_COMMON (decl) = 1;
4503 if (TREE_CODE (decl) == VAR_DECL
4504 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4505 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4507 /* This is a const variable with implicit 'static'. Set
4508 DECL_THIS_STATIC so we can tell it from variables that are
4509 !TREE_PUBLIC because of the anonymous namespace. */
4510 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4511 DECL_THIS_STATIC (decl) = 1;
4514 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4515 start_decl_1 (decl, initialized);
4520 /* Process the declaration of a variable DECL. INITIALIZED is true
4521 iff DECL is explicitly initialized. (INITIALIZED is false if the
4522 variable is initialized via an implicitly-called constructor.)
4523 This function must be called for ordinary variables (including, for
4524 example, implicit instantiations of templates), but must not be
4525 called for template declarations. */
4528 start_decl_1 (tree decl, bool initialized)
4532 bool aggregate_definition_p;
4534 gcc_assert (!processing_template_decl);
4536 if (error_operand_p (decl))
4539 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4541 type = TREE_TYPE (decl);
4542 complete_p = COMPLETE_TYPE_P (type);
4543 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4545 /* If an explicit initializer is present, or if this is a definition
4546 of an aggregate, then we need a complete type at this point.
4547 (Scalars are always complete types, so there is nothing to
4548 check.) This code just sets COMPLETE_P; errors (if necessary)
4549 are issued below. */
4550 if ((initialized || aggregate_definition_p)
4552 && COMPLETE_TYPE_P (complete_type (type)))
4555 /* We will not yet have set TREE_READONLY on DECL if the type
4556 was "const", but incomplete, before this point. But, now, we
4557 have a complete type, so we can try again. */
4558 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4562 /* Is it valid for this decl to have an initializer at all? */
4564 /* Don't allow initializations for incomplete types except for
4565 arrays which might be completed by the initialization. */
4567 ; /* A complete type is ok. */
4568 else if (type_uses_auto (type))
4569 ; /* An auto type is ok. */
4570 else if (TREE_CODE (type) != ARRAY_TYPE)
4572 error ("variable %q#D has initializer but incomplete type", decl);
4573 type = TREE_TYPE (decl) = error_mark_node;
4575 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4577 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4578 error ("elements of array %q#D have incomplete type", decl);
4579 /* else we already gave an error in start_decl. */
4582 else if (aggregate_definition_p && !complete_p)
4584 if (type_uses_auto (type))
4585 error ("declaration of %q#D has no initializer", decl);
4587 error ("aggregate %q#D has incomplete type and cannot be defined",
4589 /* Change the type so that assemble_variable will give
4590 DECL an rtl we can live with: (mem (const_int 0)). */
4591 type = TREE_TYPE (decl) = error_mark_node;
4594 /* Create a new scope to hold this declaration if necessary.
4595 Whether or not a new scope is necessary cannot be determined
4596 until after the type has been completed; if the type is a
4597 specialization of a class template it is not until after
4598 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4599 will be set correctly. */
4600 maybe_push_cleanup_level (type);
4603 /* Handle initialization of references. DECL, TYPE, and INIT have the
4604 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4605 but will be set to a new CLEANUP_STMT if a temporary is created
4606 that must be destroyed subsequently.
4608 Returns an initializer expression to use to initialize DECL, or
4609 NULL if the initialization can be performed statically.
4611 Quotes on semantics can be found in ARM 8.4.3. */
4614 grok_reference_init (tree decl, tree type, tree init, tree *cleanup,
4619 if (init == NULL_TREE)
4621 if ((DECL_LANG_SPECIFIC (decl) == 0
4622 || DECL_IN_AGGR_P (decl) == 0)
4623 && ! DECL_THIS_EXTERN (decl))
4624 error ("%qD declared as reference but not initialized", decl);
4628 if (TREE_CODE (init) == TREE_LIST)
4629 init = build_x_compound_expr_from_list (init, ELK_INIT,
4630 tf_warning_or_error);
4632 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4633 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4634 /* Note: default conversion is only called in very special cases. */
4635 init = decay_conversion (init);
4637 /* Convert INIT to the reference type TYPE. This may involve the
4638 creation of a temporary, whose lifetime must be the same as that
4639 of the reference. If so, a DECL_EXPR for the temporary will be
4640 added just after the DECL_EXPR for DECL. That's why we don't set
4641 DECL_INITIAL for local references (instead assigning to them
4642 explicitly); we need to allow the temporary to be initialized
4644 tmp = initialize_reference (type, init, decl, cleanup, flags,
4645 tf_warning_or_error);
4646 if (DECL_DECLARED_CONSTEXPR_P (decl))
4648 tmp = cxx_constant_value (tmp);
4649 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4650 = reduced_constant_expression_p (tmp);
4653 if (tmp == error_mark_node)
4655 else if (tmp == NULL_TREE)
4657 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4661 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4664 DECL_INITIAL (decl) = tmp;
4669 /* Subroutine of check_initializer. We're initializing a DECL of
4670 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4671 extend the lifetime of the underlying array to match that of the decl,
4672 just like for reference initialization. CLEANUP is as for
4673 grok_reference_init. */
4676 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4679 tree aggr_init, array, arrtype;
4680 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4681 if (error_operand_p (init))
4682 return error_mark_node;
4684 aggr_init = TARGET_EXPR_INITIAL (init);
4685 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4686 arrtype = TREE_TYPE (array);
4688 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4689 array = TREE_OPERAND (array, 0);
4690 /* If the array is constant, finish_compound_literal already made it a
4691 static variable and we don't need to do anything here. */
4692 if (decl && TREE_CODE (array) == TARGET_EXPR)
4694 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4695 var = build_address (var);
4696 var = convert (arrtype, var);
4697 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4702 /* Designated initializers in arrays are not supported in GNU C++.
4703 The parser cannot detect this error since it does not know whether
4704 a given brace-enclosed initializer is for a class type or for an
4705 array. This function checks that CE does not use a designated
4706 initializer. If it does, an error is issued. Returns true if CE
4707 is valid, i.e., does not have a designated initializer. */
4710 check_array_designated_initializer (const constructor_elt *ce,
4711 unsigned HOST_WIDE_INT index)
4713 /* Designated initializers for array elements are not supported. */
4716 /* The parser only allows identifiers as designated
4718 if (ce->index == error_mark_node)
4719 error ("name used in a GNU-style designated "
4720 "initializer for an array");
4721 else if (TREE_CODE (ce->index) == INTEGER_CST)
4723 /* A C99 designator is OK if it matches the current index. */
4724 if (TREE_INT_CST_LOW (ce->index) == index)
4727 sorry ("non-trivial designated initializers not supported");
4731 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4732 error ("name %qD used in a GNU-style designated "
4733 "initializer for an array", ce->index);
4741 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4742 array until we finish parsing the initializer. If that's the
4743 situation we're in, update DECL accordingly. */
4746 maybe_deduce_size_from_array_init (tree decl, tree init)
4748 tree type = TREE_TYPE (decl);
4750 if (TREE_CODE (type) == ARRAY_TYPE
4751 && TYPE_DOMAIN (type) == NULL_TREE
4752 && TREE_CODE (decl) != TYPE_DECL)
4754 /* do_default is really a C-ism to deal with tentative definitions.
4755 But let's leave it here to ease the eventual merge. */
4756 int do_default = !DECL_EXTERNAL (decl);
4757 tree initializer = init ? init : DECL_INITIAL (decl);
4760 /* Check that there are no designated initializers in INIT, as
4761 those are not supported in GNU C++, and as the middle-end
4762 will crash if presented with a non-numeric designated
4764 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4766 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4767 constructor_elt *ce;
4769 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4770 if (!check_array_designated_initializer (ce, i))
4776 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4780 error ("initializer fails to determine size of %qD", decl);
4781 TREE_TYPE (decl) = error_mark_node;
4783 else if (failure == 2)
4787 error ("array size missing in %qD", decl);
4788 TREE_TYPE (decl) = error_mark_node;
4790 /* If a `static' var's size isn't known, make it extern as
4791 well as static, so it does not get allocated. If it's not
4792 `static', then don't mark it extern; finish_incomplete_decl
4793 will give it a default size and it will get allocated. */
4794 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4795 DECL_EXTERNAL (decl) = 1;
4797 else if (failure == 3)
4799 error ("zero-size array %qD", decl);
4800 TREE_TYPE (decl) = error_mark_node;
4804 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4806 relayout_decl (decl);
4810 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4811 any appropriate error messages regarding the layout. */
4814 layout_var_decl (tree decl)
4818 type = TREE_TYPE (decl);
4819 if (type == error_mark_node)
4822 /* If we haven't already layed out this declaration, do so now.
4823 Note that we must not call complete type for an external object
4824 because it's type might involve templates that we are not
4825 supposed to instantiate yet. (And it's perfectly valid to say
4826 `extern X x' for some incomplete type `X'.) */
4827 if (!DECL_EXTERNAL (decl))
4828 complete_type (type);
4829 if (!DECL_SIZE (decl)
4830 && TREE_TYPE (decl) != error_mark_node
4831 && (COMPLETE_TYPE_P (type)
4832 || (TREE_CODE (type) == ARRAY_TYPE
4833 && !TYPE_DOMAIN (type)
4834 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4835 layout_decl (decl, 0);
4837 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4839 /* An automatic variable with an incomplete type: that is an error.
4840 Don't talk about array types here, since we took care of that
4841 message in grokdeclarator. */
4842 error ("storage size of %qD isn%'t known", decl);
4843 TREE_TYPE (decl) = error_mark_node;
4846 /* Keep this code around in case we later want to control debug info
4847 based on whether a type is "used". (jason 1999-11-11) */
4849 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4850 /* Let debugger know it should output info for this type. */
4851 note_debug_info_needed (ttype);
4853 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4854 note_debug_info_needed (DECL_CONTEXT (decl));
4857 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4858 && DECL_SIZE (decl) != NULL_TREE
4859 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4861 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4862 constant_expression_warning (DECL_SIZE (decl));
4865 error ("storage size of %qD isn%'t constant", decl);
4866 TREE_TYPE (decl) = error_mark_node;
4871 /* If a local static variable is declared in an inline function, or if
4872 we have a weak definition, we must endeavor to create only one
4873 instance of the variable at link-time. */
4876 maybe_commonize_var (tree decl)
4878 /* Static data in a function with comdat linkage also has comdat
4880 if (TREE_STATIC (decl)
4881 /* Don't mess with __FUNCTION__. */
4882 && ! DECL_ARTIFICIAL (decl)
4883 && DECL_FUNCTION_SCOPE_P (decl)
4884 && vague_linkage_p (DECL_CONTEXT (decl)))
4888 /* With weak symbols, we simply make the variable COMDAT;
4889 that will cause copies in multiple translations units to
4891 comdat_linkage (decl);
4895 if (DECL_INITIAL (decl) == NULL_TREE
4896 || DECL_INITIAL (decl) == error_mark_node)
4898 /* Without weak symbols, we can use COMMON to merge
4899 uninitialized variables. */
4900 TREE_PUBLIC (decl) = 1;
4901 DECL_COMMON (decl) = 1;
4905 /* While for initialized variables, we must use internal
4906 linkage -- which means that multiple copies will not
4908 TREE_PUBLIC (decl) = 0;
4909 DECL_COMMON (decl) = 0;
4910 warning_at (input_location, 0,
4911 "sorry: semantics of inline function static "
4912 "data %q+#D are wrong (you%'ll wind up "
4913 "with multiple copies)", decl);
4914 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4915 " you can work around this by removing "
4920 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4921 /* Set it up again; we might have set DECL_INITIAL since the last
4923 comdat_linkage (decl);
4926 /* Issue an error message if DECL is an uninitialized const variable. */
4929 check_for_uninitialized_const_var (tree decl)
4931 tree type = strip_array_types (TREE_TYPE (decl));
4933 /* ``Unless explicitly declared extern, a const object does not have
4934 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4936 if (TREE_CODE (decl) == VAR_DECL
4937 && TREE_CODE (type) != REFERENCE_TYPE
4938 && CP_TYPE_CONST_P (type)
4939 && !DECL_INITIAL (decl))
4941 tree field = default_init_uninitialized_part (type);
4945 permerror (DECL_SOURCE_LOCATION (decl),
4946 "uninitialized const %qD", decl);
4948 if (CLASS_TYPE_P (type))
4950 tree defaulted_ctor;
4952 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4953 "%q#T has no user-provided default constructor", type);
4954 defaulted_ctor = in_class_defaulted_default_constructor (type);
4956 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4957 "constructor is not user-provided because it is "
4958 "explicitly defaulted in the class body");
4959 inform (0, "and the implicitly-defined constructor does not "
4960 "initialize %q+#D", field);
4965 /* Structure holding the current initializer being processed by reshape_init.
4966 CUR is a pointer to the current element being processed, END is a pointer
4967 after the last element present in the initializer. */
4968 typedef struct reshape_iterator_t
4970 constructor_elt *cur;
4971 constructor_elt *end;
4974 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4976 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4977 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4978 initialized. If there are no more such fields, the return value
4982 next_initializable_field (tree field)
4985 && (TREE_CODE (field) != FIELD_DECL
4986 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4987 || DECL_ARTIFICIAL (field)))
4988 field = DECL_CHAIN (field);
4993 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4994 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4995 INTEGER_CST representing the size of the array minus one (the maximum index),
4996 or NULL_TREE if the array was declared without specifying the size. D is
4997 the iterator within the constructor. */
5000 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
5001 tsubst_flags_t complain)
5004 bool sized_array_p = (max_index != NULL_TREE);
5005 unsigned HOST_WIDE_INT max_index_cst = 0;
5006 unsigned HOST_WIDE_INT index;
5008 /* The initializer for an array is always a CONSTRUCTOR. */
5009 new_init = build_constructor (init_list_type_node, NULL);
5013 /* Minus 1 is used for zero sized arrays. */
5014 if (integer_all_onesp (max_index))
5017 if (host_integerp (max_index, 1))
5018 max_index_cst = tree_low_cst (max_index, 1);
5019 /* sizetype is sign extended, not zero extended. */
5021 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
5025 /* Loop until there are no more initializers. */
5027 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5032 check_array_designated_initializer (d->cur, index);
5033 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5035 if (elt_init == error_mark_node)
5036 return error_mark_node;
5037 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5038 size_int (index), elt_init);
5039 if (!TREE_CONSTANT (elt_init))
5040 TREE_CONSTANT (new_init) = false;
5046 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5047 Parameters are the same of reshape_init_r. */
5050 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5052 tree max_index = NULL_TREE;
5054 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5056 if (TYPE_DOMAIN (type))
5057 max_index = array_type_nelts (type);
5059 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5062 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5063 Parameters are the same of reshape_init_r. */
5066 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5068 tree max_index = NULL_TREE;
5070 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5072 if (COMPOUND_LITERAL_P (d->cur->value))
5074 tree value = d->cur->value;
5075 if (!same_type_p (TREE_TYPE (value), type))
5077 if (complain & tf_error)
5078 error ("invalid type %qT as initializer for a vector of type %qT",
5079 TREE_TYPE (d->cur->value), type);
5080 value = error_mark_node;
5086 /* For a vector, we initialize it as an array of the appropriate size. */
5087 if (TREE_CODE (type) == VECTOR_TYPE)
5088 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5090 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5093 /* Subroutine of reshape_init_r, processes the initializers for classes
5094 or union. Parameters are the same of reshape_init_r. */
5097 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5098 tsubst_flags_t complain)
5103 gcc_assert (CLASS_TYPE_P (type));
5105 /* The initializer for a class is always a CONSTRUCTOR. */
5106 new_init = build_constructor (init_list_type_node, NULL);
5107 field = next_initializable_field (TYPE_FIELDS (type));
5113 An initializer for an aggregate member that is an
5114 empty class shall have the form of an empty
5115 initializer-list {}. */
5116 if (!first_initializer_p)
5118 if (complain & tf_error)
5119 error ("initializer for %qT must be brace-enclosed", type);
5120 return error_mark_node;
5125 /* Loop through the initializable fields, gathering initializers. */
5126 while (d->cur != d->end)
5130 /* Handle designated initializers, as an extension. */
5133 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5135 if (!field || TREE_CODE (field) != FIELD_DECL)
5137 if (complain & tf_error)
5138 error ("%qT has no non-static data member named %qD", type,
5140 return error_mark_node;
5144 /* If we processed all the member of the class, we are done. */
5148 field_init = reshape_init_r (TREE_TYPE (field), d,
5149 /*first_initializer_p=*/false, complain);
5150 if (field_init == error_mark_node)
5151 return error_mark_node;
5153 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5157 When a union is initialized with a brace-enclosed
5158 initializer, the braces shall only contain an
5159 initializer for the first member of the union. */
5160 if (TREE_CODE (type) == UNION_TYPE)
5163 field = next_initializable_field (DECL_CHAIN (field));
5169 /* Subroutine of reshape_init, which processes a single initializer (part of
5170 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5171 iterator within the CONSTRUCTOR which points to the initializer to process.
5172 FIRST_INITIALIZER_P is true if this is the first initializer of the
5173 outermost CONSTRUCTOR node. */
5176 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5177 tsubst_flags_t complain)
5179 tree init = d->cur->value;
5181 if (error_operand_p (init))
5182 return error_mark_node;
5184 if (TREE_CODE (type) == COMPLEX_TYPE)
5186 /* A complex type can be initialized from one or two initializers,
5187 but braces are not elided. */
5189 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5191 if (CONSTRUCTOR_NELTS (init) > 2)
5193 if (complain & tf_error)
5194 error ("too many initializers for %qT", type);
5196 return error_mark_node;
5199 else if (first_initializer_p && d->cur != d->end)
5201 VEC(constructor_elt, gc) *v = 0;
5202 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5203 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5205 init = build_constructor (init_list_type_node, v);
5210 /* A non-aggregate type is always initialized with a single
5212 if (!CP_AGGREGATE_TYPE_P (type))
5214 /* It is invalid to initialize a non-aggregate type with a
5215 brace-enclosed initializer before C++0x.
5216 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5217 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5218 a CONSTRUCTOR (with a record type). */
5219 if (TREE_CODE (init) == CONSTRUCTOR
5220 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5222 if (SCALAR_TYPE_P (type))
5224 if (complain & tf_error)
5225 error ("braces around scalar initializer for type %qT", type);
5226 init = error_mark_node;
5229 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5238 All implicit type conversions (clause _conv_) are considered when
5239 initializing the aggregate member with an initializer from an
5240 initializer-list. If the initializer can initialize a member,
5241 the member is initialized. Otherwise, if the member is itself a
5242 non-empty subaggregate, brace elision is assumed and the
5243 initializer is considered for the initialization of the first
5244 member of the subaggregate. */
5245 if (TREE_CODE (init) != CONSTRUCTOR
5246 /* But don't try this for the first initializer, since that would be
5247 looking through the outermost braces; A a2 = { a1 }; is not a
5248 valid aggregate initialization. */
5249 && !first_initializer_p
5250 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5251 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5257 /* [dcl.init.string]
5259 A char array (whether plain char, signed char, or unsigned char)
5260 can be initialized by a string-literal (optionally enclosed in
5261 braces); a wchar_t array can be initialized by a wide
5262 string-literal (optionally enclosed in braces). */
5263 if (TREE_CODE (type) == ARRAY_TYPE
5264 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5266 tree str_init = init;
5268 /* Strip one level of braces if and only if they enclose a single
5269 element (as allowed by [dcl.init.string]). */
5270 if (!first_initializer_p
5271 && TREE_CODE (str_init) == CONSTRUCTOR
5272 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5274 str_init = VEC_index (constructor_elt,
5275 CONSTRUCTOR_ELTS (str_init), 0)->value;
5278 /* If it's a string literal, then it's the initializer for the array
5279 as a whole. Otherwise, continue with normal initialization for
5280 array types (one value per array element). */
5281 if (TREE_CODE (str_init) == STRING_CST)
5288 /* The following cases are about aggregates. If we are not within a full
5289 initializer already, and there is not a CONSTRUCTOR, it means that there
5290 is a missing set of braces (that is, we are processing the case for
5291 which reshape_init exists). */
5292 if (!first_initializer_p)
5294 if (TREE_CODE (init) == CONSTRUCTOR)
5296 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5297 /* There is no need to reshape pointer-to-member function
5298 initializers, as they are always constructed correctly
5299 by the front end. */
5301 else if (COMPOUND_LITERAL_P (init))
5302 /* For a nested compound literal, there is no need to reshape since
5303 brace elision is not allowed. Even if we decided to allow it,
5304 we should add a call to reshape_init in finish_compound_literal,
5305 before calling digest_init, so changing this code would still
5306 not be necessary. */
5307 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5311 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5312 return reshape_init (type, init, complain);
5316 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5320 /* Dispatch to specialized routines. */
5321 if (CLASS_TYPE_P (type))
5322 return reshape_init_class (type, d, first_initializer_p, complain);
5323 else if (TREE_CODE (type) == ARRAY_TYPE)
5324 return reshape_init_array (type, d, complain);
5325 else if (TREE_CODE (type) == VECTOR_TYPE)
5326 return reshape_init_vector (type, d, complain);
5331 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5332 brace-enclosed aggregate initializer.
5334 INIT is the CONSTRUCTOR containing the list of initializers describing
5335 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5336 It may not presently match the shape of the TYPE; for example:
5338 struct S { int a; int b; };
5339 struct S a[] = { 1, 2, 3, 4 };
5341 Here INIT will hold a VEC of four elements, rather than a
5342 VEC of two elements, each itself a VEC of two elements. This
5343 routine transforms INIT from the former form into the latter. The
5344 revised CONSTRUCTOR node is returned. */
5347 reshape_init (tree type, tree init, tsubst_flags_t complain)
5349 VEC(constructor_elt, gc) *v;
5353 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5355 v = CONSTRUCTOR_ELTS (init);
5357 /* An empty constructor does not need reshaping, and it is always a valid
5359 if (VEC_empty (constructor_elt, v))
5362 /* Recurse on this CONSTRUCTOR. */
5363 d.cur = VEC_index (constructor_elt, v, 0);
5364 d.end = d.cur + VEC_length (constructor_elt, v);
5366 new_init = reshape_init_r (type, &d, true, complain);
5367 if (new_init == error_mark_node)
5368 return error_mark_node;
5370 /* Make sure all the element of the constructor were used. Otherwise,
5371 issue an error about exceeding initializers. */
5374 if (complain & tf_error)
5375 error ("too many initializers for %qT", type);
5377 return error_mark_node;
5383 /* Verify array initializer. Returns true if errors have been reported. */
5386 check_array_initializer (tree decl, tree type, tree init)
5388 tree element_type = TREE_TYPE (type);
5390 /* The array type itself need not be complete, because the
5391 initializer may tell us how many elements are in the array.
5392 But, the elements of the array must be complete. */
5393 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5396 error ("elements of array %q#D have incomplete type", decl);
5398 error ("elements of array %q#T have incomplete type", type);
5401 /* It is not valid to initialize a VLA. */
5403 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5404 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5407 error ("variable-sized object %qD may not be initialized", decl);
5409 error ("variable-sized compound literal");
5415 /* Subroutine of check_initializer; args are passed down from that function.
5416 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5419 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5422 int saved_stmts_are_full_exprs_p = 0;
5423 if (building_stmt_list_p ())
5425 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5426 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5428 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5429 if (building_stmt_list_p ())
5430 current_stmt_tree ()->stmts_are_full_exprs_p =
5431 saved_stmts_are_full_exprs_p;
5435 /* Verify INIT (the initializer for DECL), and record the
5436 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5437 grok_reference_init.
5439 If the return value is non-NULL, it is an expression that must be
5440 evaluated dynamically to initialize DECL. */
5443 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5445 tree type = TREE_TYPE (decl);
5446 tree init_code = NULL;
5447 tree extra_init = NULL_TREE;
5450 /* Things that are going to be initialized need to have complete
5452 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5454 if (DECL_HAS_VALUE_EXPR_P (decl))
5456 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5457 it doesn't have storage to be initialized. */
5458 gcc_assert (init == NULL_TREE);
5462 if (type == error_mark_node)
5463 /* We will have already complained. */
5466 if (TREE_CODE (type) == ARRAY_TYPE)
5468 if (check_array_initializer (decl, type, init))
5471 else if (!COMPLETE_TYPE_P (type))
5473 error ("%qD has incomplete type", decl);
5474 TREE_TYPE (decl) = error_mark_node;
5478 /* There is no way to make a variable-sized class type in GNU C++. */
5479 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5481 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5483 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5484 if (SCALAR_TYPE_P (type))
5488 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5489 init = build_zero_init (type, NULL_TREE, false);
5491 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5493 error ("scalar object %qD requires one element in initializer",
5495 TREE_TYPE (decl) = error_mark_node;
5501 if (TREE_CODE (decl) == CONST_DECL)
5503 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5505 DECL_INITIAL (decl) = init;
5507 gcc_assert (init != NULL_TREE);
5510 else if (!init && DECL_REALLY_EXTERN (decl))
5512 else if (TREE_CODE (type) == REFERENCE_TYPE)
5513 init = grok_reference_init (decl, type, init, cleanup, flags);
5514 else if (init || type_build_ctor_call (type))
5517 check_for_uninitialized_const_var (decl);
5518 /* Do not reshape constructors of vectors (they don't need to be
5520 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5522 if (is_std_init_list (type))
5523 init = build_init_list_var_init (decl, type, init,
5524 &extra_init, cleanup);
5525 else if (TYPE_NON_AGGREGATE_CLASS (type))
5527 /* Don't reshape if the class has constructors. */
5528 if (cxx_dialect == cxx98)
5529 error ("in C++98 %qD must be initialized by constructor, "
5533 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5535 error ("opaque vector types cannot be initialized");
5536 init = error_mark_node;
5540 init = reshape_init (type, init, tf_warning_or_error);
5541 if (SCALAR_TYPE_P (type))
5542 check_narrowing (type, init);
5546 /* If DECL has an array type without a specific bound, deduce the
5547 array size from the initializer. */
5548 maybe_deduce_size_from_array_init (decl, init);
5549 type = TREE_TYPE (decl);
5550 if (type == error_mark_node)
5553 if (type_build_ctor_call (type)
5554 || (CLASS_TYPE_P (type)
5555 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5557 init_code = build_aggr_init_full_exprs (decl, init, flags);
5559 /* If this is a constexpr initializer, expand_default_init will
5560 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5561 case, pull the initializer back out and pass it down into
5562 store_init_value. */
5563 while (TREE_CODE (init_code) == EXPR_STMT
5564 || TREE_CODE (init_code) == CONVERT_EXPR)
5565 init_code = TREE_OPERAND (init_code, 0);
5566 if (TREE_CODE (init_code) == INIT_EXPR)
5568 init = TREE_OPERAND (init_code, 1);
5569 init_code = NULL_TREE;
5570 /* Don't call digest_init; it's unnecessary and will complain
5571 about aggregate initialization of non-aggregate classes. */
5572 flags |= LOOKUP_ALREADY_DIGESTED;
5574 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5576 /* Declared constexpr, but no suitable initializer; massage
5577 init appropriately so we can pass it into store_init_value
5579 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5580 init = finish_compound_literal (type, init,
5581 tf_warning_or_error);
5582 else if (CLASS_TYPE_P (type)
5583 && (!init || TREE_CODE (init) == TREE_LIST))
5585 init = build_functional_cast (type, init, tf_none);
5586 if (init != error_mark_node)
5587 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5589 init_code = NULL_TREE;
5595 if (init && TREE_CODE (init) != TREE_VEC)
5597 init_code = store_init_value (decl, init, flags);
5598 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5599 && DECL_INITIAL (decl)
5600 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5601 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5602 warning (0, "array %qD initialized by parenthesized string literal %qE",
5603 decl, DECL_INITIAL (decl));
5609 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5610 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5611 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5612 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5615 check_for_uninitialized_const_var (decl);
5618 if (init && init != error_mark_node)
5619 init_code = build2 (INIT_EXPR, type, decl, init);
5622 init_code = add_stmt_to_compound (extra_init, init_code);
5624 if (init_code && DECL_IN_AGGR_P (decl))
5626 static int explained = 0;
5628 if (cxx_dialect < cxx0x)
5629 error ("initializer invalid for static member with constructor");
5631 error ("non-constant in-class initialization invalid for static "
5632 "member %qD", decl);
5635 error ("(an out of class initialization is required)");
5643 /* If DECL is not a local variable, give it RTL. */
5646 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5648 int toplev = toplevel_bindings_p ();
5650 const char *filename;
5652 /* Set the DECL_ASSEMBLER_NAME for the object. */
5655 /* The `register' keyword, when used together with an
5656 asm-specification, indicates that the variable should be
5657 placed in a particular register. */
5658 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5660 set_user_assembler_name (decl, asmspec);
5661 DECL_HARD_REGISTER (decl) = 1;
5665 if (TREE_CODE (decl) == FUNCTION_DECL
5666 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5667 set_builtin_user_assembler_name (decl, asmspec);
5668 set_user_assembler_name (decl, asmspec);
5672 /* Handle non-variables up front. */
5673 if (TREE_CODE (decl) != VAR_DECL)
5675 rest_of_decl_compilation (decl, toplev, at_eof);
5679 /* If we see a class member here, it should be a static data
5681 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5683 gcc_assert (TREE_STATIC (decl));
5684 /* An in-class declaration of a static data member should be
5685 external; it is only a declaration, and not a definition. */
5686 if (init == NULL_TREE)
5687 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5690 /* We don't create any RTL for local variables. */
5691 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5694 /* We defer emission of local statics until the corresponding
5695 DECL_EXPR is expanded. */
5696 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5698 /* We try to defer namespace-scope static constants so that they are
5699 not emitted into the object file unnecessarily. */
5700 filename = input_filename;
5701 if (!DECL_VIRTUAL_P (decl)
5702 && TREE_READONLY (decl)
5703 && DECL_INITIAL (decl) != NULL_TREE
5704 && DECL_INITIAL (decl) != error_mark_node
5706 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5708 && !TREE_PUBLIC (decl))
5710 /* Fool with the linkage of static consts according to #pragma
5712 struct c_fileinfo *finfo = get_fileinfo (filename);
5713 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5715 TREE_PUBLIC (decl) = 1;
5716 DECL_EXTERNAL (decl) = finfo->interface_only;
5721 /* Likewise for template instantiations. */
5722 else if (DECL_LANG_SPECIFIC (decl)
5723 && DECL_IMPLICIT_INSTANTIATION (decl))
5726 /* If we're not deferring, go ahead and assemble the variable. */
5728 rest_of_decl_compilation (decl, toplev, at_eof);
5731 /* walk_tree helper for wrap_temporary_cleanups, below. */
5734 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5736 /* Stop at types or full-expression boundaries. */
5737 if (TYPE_P (*stmt_p)
5738 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5744 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5746 tree guard = (tree)data;
5747 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5749 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5750 /* Tell honor_protect_cleanup_actions to handle this as a separate
5752 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5754 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5760 /* We're initializing a local variable which has a cleanup GUARD. If there
5761 are any temporaries used in the initializer INIT of this variable, we
5762 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5763 variable will be cleaned up properly if one of them throws.
5765 Unfortunately, there's no way to express this properly in terms of
5766 nesting, as the regions for the temporaries overlap the region for the
5767 variable itself; if there are two temporaries, the variable needs to be
5768 the first thing destroyed if either of them throws. However, we only
5769 want to run the variable's cleanup if it actually got constructed. So
5770 we need to guard the temporary cleanups with the variable's cleanup if
5771 they are run on the normal path, but not if they are run on the
5772 exceptional path. We implement this by telling
5773 honor_protect_cleanup_actions to strip the variable cleanup from the
5774 exceptional path. */
5777 wrap_temporary_cleanups (tree init, tree guard)
5779 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5782 /* Generate code to initialize DECL (a local variable). */
5785 initialize_local_var (tree decl, tree init)
5787 tree type = TREE_TYPE (decl);
5791 gcc_assert (TREE_CODE (decl) == VAR_DECL
5792 || TREE_CODE (decl) == RESULT_DECL);
5793 gcc_assert (!TREE_STATIC (decl));
5795 if (DECL_SIZE (decl) == NULL_TREE)
5797 /* If we used it already as memory, it must stay in memory. */
5798 DECL_INITIAL (decl) = NULL_TREE;
5799 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5803 if (type == error_mark_node)
5806 /* Compute and store the initial value. */
5807 already_used = TREE_USED (decl) || TREE_USED (type);
5808 if (TREE_USED (type))
5809 DECL_READ_P (decl) = 1;
5811 /* Generate a cleanup, if necessary. */
5812 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5814 /* Perform the initialization. */
5817 if (TREE_CODE (init) == INIT_EXPR
5818 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5820 /* Stick simple initializers in DECL_INITIAL so that
5821 -Wno-init-self works (c++/34772). */
5822 gcc_assert (TREE_OPERAND (init, 0) == decl);
5823 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5827 int saved_stmts_are_full_exprs_p;
5829 /* If we're only initializing a single object, guard the
5830 destructors of any temporaries used in its initializer with
5831 its destructor. This isn't right for arrays because each
5832 element initialization is a full-expression. */
5833 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5834 wrap_temporary_cleanups (init, cleanup);
5836 gcc_assert (building_stmt_list_p ());
5837 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5838 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5839 finish_expr_stmt (init);
5840 current_stmt_tree ()->stmts_are_full_exprs_p =
5841 saved_stmts_are_full_exprs_p;
5845 /* Set this to 0 so we can tell whether an aggregate which was
5846 initialized was ever used. Don't do this if it has a
5847 destructor, so we don't complain about the 'resource
5848 allocation is initialization' idiom. Now set
5849 attribute((unused)) on types so decls of that type will be
5850 marked used. (see TREE_USED, above.) */
5851 if (TYPE_NEEDS_CONSTRUCTING (type)
5853 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5854 && DECL_NAME (decl))
5855 TREE_USED (decl) = 0;
5856 else if (already_used)
5857 TREE_USED (decl) = 1;
5860 finish_decl_cleanup (decl, cleanup);
5863 /* DECL is a VAR_DECL for a compiler-generated variable with static
5864 storage duration (like a virtual table) whose initializer is a
5865 compile-time constant. Initialize the variable and provide it to the
5869 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5872 gcc_assert (DECL_ARTIFICIAL (decl));
5873 init = build_constructor (TREE_TYPE (decl), v);
5874 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5875 DECL_INITIAL (decl) = init;
5876 DECL_INITIALIZED_P (decl) = 1;
5877 determine_visibility (decl);
5878 layout_var_decl (decl);
5879 maybe_commonize_var (decl);
5880 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5883 /* INIT is the initializer for a variable, as represented by the
5884 parser. Returns true iff INIT is type-dependent. */
5887 type_dependent_init_p (tree init)
5889 if (TREE_CODE (init) == TREE_LIST)
5890 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5891 return any_type_dependent_elements_p (init);
5892 else if (TREE_CODE (init) == CONSTRUCTOR)
5893 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5895 VEC(constructor_elt, gc) *elts;
5899 elts = CONSTRUCTOR_ELTS (init);
5900 nelts = VEC_length (constructor_elt, elts);
5901 for (i = 0; i < nelts; ++i)
5902 if (type_dependent_init_p (VEC_index (constructor_elt,
5907 /* It must be a simple expression, e.g., int i = 3; */
5908 return type_dependent_expression_p (init);
5913 /* INIT is the initializer for a variable, as represented by the
5914 parser. Returns true iff INIT is value-dependent. */
5917 value_dependent_init_p (tree init)
5919 if (TREE_CODE (init) == TREE_LIST)
5920 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5921 return any_value_dependent_elements_p (init);
5922 else if (TREE_CODE (init) == CONSTRUCTOR)
5923 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5925 VEC(constructor_elt, gc) *elts;
5929 elts = CONSTRUCTOR_ELTS (init);
5930 nelts = VEC_length (constructor_elt, elts);
5931 for (i = 0; i < nelts; ++i)
5932 if (value_dependent_init_p (VEC_index (constructor_elt,
5937 /* It must be a simple expression, e.g., int i = 3; */
5938 return value_dependent_expression_p (init);
5943 /* Finish processing of a declaration;
5944 install its line number and initial value.
5945 If the length of an array type is not known before,
5946 it must be determined now, from the initial value, or it is an error.
5948 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5949 true, then INIT is an integral constant expression.
5951 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5952 if the (init) syntax was used. */
5955 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5956 tree asmspec_tree, int flags)
5960 const char *asmspec = NULL;
5961 int was_readonly = 0;
5962 bool var_definition_p = false;
5965 if (decl == error_mark_node)
5970 error ("assignment (not initialization) in declaration");
5974 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5975 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5976 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5978 type = TREE_TYPE (decl);
5979 if (type == error_mark_node)
5982 /* Assume no cleanup is required. */
5983 cleanup = NULL_TREE;
5985 /* If a name was specified, get the string. */
5986 if (at_namespace_scope_p ())
5987 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5988 if (asmspec_tree && asmspec_tree != error_mark_node)
5989 asmspec = TREE_STRING_POINTER (asmspec_tree);
5991 if (current_class_type
5992 && CP_DECL_CONTEXT (decl) == current_class_type
5993 && TYPE_BEING_DEFINED (current_class_type)
5994 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5995 && (DECL_INITIAL (decl) || init))
5996 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5998 auto_node = type_uses_auto (type);
6002 if (init == NULL_TREE)
6004 error ("declaration of %q#D has no initializer", decl);
6005 TREE_TYPE (decl) = error_mark_node;
6009 if (TREE_CODE (d_init) == TREE_LIST)
6010 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6011 tf_warning_or_error);
6012 d_init = resolve_nondeduced_context (d_init);
6013 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6015 if (type == error_mark_node)
6019 if (!ensure_literal_type_for_constexpr_object (decl))
6020 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6022 if (TREE_CODE (decl) == VAR_DECL
6023 && DECL_CLASS_SCOPE_P (decl)
6024 && DECL_INITIALIZED_IN_CLASS_P (decl))
6025 check_static_variable_definition (decl, type);
6027 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6030 if (init == ridpointers[(int)RID_DELETE])
6032 /* FIXME check this is 1st decl. */
6033 DECL_DELETED_FN (decl) = 1;
6034 DECL_DECLARED_INLINE_P (decl) = 1;
6035 DECL_INITIAL (decl) = error_mark_node;
6036 FOR_EACH_CLONE (clone, decl)
6038 DECL_DELETED_FN (clone) = 1;
6039 DECL_DECLARED_INLINE_P (clone) = 1;
6040 DECL_INITIAL (clone) = error_mark_node;
6044 else if (init == ridpointers[(int)RID_DEFAULT])
6046 if (defaultable_fn_check (decl))
6047 DECL_DEFAULTED_FN (decl) = 1;
6049 DECL_INITIAL (decl) = NULL_TREE;
6053 if (init && TREE_CODE (decl) == VAR_DECL)
6055 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6056 /* If DECL is a reference, then we want to know whether init is a
6057 reference constant; init_const_expr_p as passed tells us whether
6058 it's an rvalue constant. */
6059 if (TREE_CODE (type) == REFERENCE_TYPE)
6060 init_const_expr_p = potential_constant_expression (init);
6061 if (init_const_expr_p)
6063 /* Set these flags now for templates. We'll update the flags in
6064 store_init_value for instantiations. */
6065 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6066 if (decl_maybe_constant_var_p (decl))
6067 TREE_CONSTANT (decl) = 1;
6071 if (processing_template_decl)
6073 bool type_dependent_p;
6075 /* Add this declaration to the statement-tree. */
6076 if (at_function_scope_p ())
6077 add_decl_expr (decl);
6079 type_dependent_p = dependent_type_p (type);
6081 if (check_for_bare_parameter_packs (init))
6084 DECL_INITIAL (decl) = NULL_TREE;
6087 /* Generally, initializers in templates are expanded when the
6088 template is instantiated. But, if DECL is a variable constant
6089 then it can be used in future constant expressions, so its value
6090 must be available. */
6092 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6093 /* We can't do anything if the decl has dependent type. */;
6095 && init_const_expr_p
6096 && !type_dependent_p
6097 && decl_maybe_constant_var_p (decl)
6098 && !type_dependent_init_p (init)
6099 && !value_dependent_init_p (init))
6101 /* This variable seems to be a non-dependent constant, so process
6102 its initializer. If check_initializer returns non-null the
6103 initialization wasn't constant after all. */
6104 tree init_code = check_initializer (decl, init, flags, &cleanup);
6105 if (init_code == NULL_TREE)
6108 else if (!DECL_PRETTY_FUNCTION_P (decl))
6109 /* Deduce array size even if the initializer is dependent. */
6110 maybe_deduce_size_from_array_init (decl, init);
6113 DECL_INITIAL (decl) = init;
6117 /* Just store non-static data member initializers for later. */
6118 if (init && TREE_CODE (decl) == FIELD_DECL)
6119 DECL_INITIAL (decl) = init;
6121 /* Take care of TYPE_DECLs up front. */
6122 if (TREE_CODE (decl) == TYPE_DECL)
6124 if (type != error_mark_node
6125 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6127 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6128 warning (0, "shadowing previous type declaration of %q#D", decl);
6129 set_identifier_type_value (DECL_NAME (decl), decl);
6132 /* If we have installed this as the canonical typedef for this
6133 type, and that type has not been defined yet, delay emitting
6134 the debug information for it, as we will emit it later. */
6135 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6136 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6137 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6139 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6144 /* A reference will be modified here, as it is initialized. */
6145 if (! DECL_EXTERNAL (decl)
6146 && TREE_READONLY (decl)
6147 && TREE_CODE (type) == REFERENCE_TYPE)
6150 TREE_READONLY (decl) = 0;
6153 if (TREE_CODE (decl) == VAR_DECL)
6155 /* Only variables with trivial initialization and destruction can
6156 have thread-local storage. */
6157 if (DECL_THREAD_LOCAL_P (decl)
6158 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6159 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6160 error ("%qD cannot be thread-local because it has non-trivial "
6161 "type %qT", decl, TREE_TYPE (decl));
6162 /* If this is a local variable that will need a mangled name,
6163 register it now. We must do this before processing the
6164 initializer for the variable, since the initialization might
6165 require a guard variable, and since the mangled name of the
6166 guard variable will depend on the mangled name of this
6168 if (DECL_FUNCTION_SCOPE_P (decl)
6169 && TREE_STATIC (decl)
6170 && !DECL_ARTIFICIAL (decl))
6172 push_local_name (decl);
6173 if (DECL_CONSTRUCTOR_P (current_function_decl)
6174 || DECL_DESTRUCTOR_P (current_function_decl))
6175 /* Normally local_decls is populated during GIMPLE lowering,
6176 but [cd]tors are never actually compiled directly. We need
6177 to put statics on the list so we can deal with the label
6178 address extension. */
6179 add_local_decl (cfun, decl);
6182 /* Convert the initializer to the type of DECL, if we have not
6183 already initialized DECL. */
6184 if (!DECL_INITIALIZED_P (decl)
6185 /* If !DECL_EXTERNAL then DECL is being defined. In the
6186 case of a static data member initialized inside the
6187 class-specifier, there can be an initializer even if DECL
6188 is *not* defined. */
6189 && (!DECL_EXTERNAL (decl) || init))
6191 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6194 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6195 /* Allow libjava/prims.cc define primitive classes. */
6196 if (init != NULL_TREE
6197 || jclass == NULL_TREE
6198 || TREE_CODE (jclass) != TYPE_DECL
6199 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6200 || !same_type_ignoring_top_level_qualifiers_p
6201 (type, TREE_TYPE (TREE_TYPE (jclass))))
6202 error ("Java object %qD not allocated with %<new%>", decl);
6205 init = check_initializer (decl, init, flags, &cleanup);
6206 /* Thread-local storage cannot be dynamically initialized. */
6207 if (DECL_THREAD_LOCAL_P (decl) && init)
6209 error ("%qD is thread-local and so cannot be dynamically "
6210 "initialized", decl);
6214 /* Check that the initializer for a static data member was a
6215 constant. Although we check in the parser that the
6216 initializer is an integral constant expression, we do not
6217 simplify division-by-zero at the point at which it
6218 occurs. Therefore, in:
6220 struct S { static const int i = 7 / 0; };
6222 we issue an error at this point. It would
6223 probably be better to forbid division by zero in
6224 integral constant expressions. */
6225 if (DECL_EXTERNAL (decl) && init)
6227 error ("%qD cannot be initialized by a non-constant expression"
6228 " when being declared", decl);
6229 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6237 The memory occupied by any object of static storage
6238 duration is zero-initialized at program startup before
6239 any other initialization takes place.
6241 We cannot create an appropriate initializer until after
6242 the type of DECL is finalized. If DECL_INITIAL is set,
6243 then the DECL is statically initialized, and any
6244 necessary zero-initialization has already been performed. */
6245 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6246 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6247 /*nelts=*/NULL_TREE,
6248 /*static_storage_p=*/true);
6249 /* Remember that the initialization for this variable has
6251 DECL_INITIALIZED_P (decl) = 1;
6252 /* This declaration is the definition of this variable,
6253 unless we are initializing a static data member within
6254 the class specifier. */
6255 if (!DECL_EXTERNAL (decl))
6256 var_definition_p = true;
6258 /* If the variable has an array type, lay out the type, even if
6259 there is no initializer. It is valid to index through the
6260 array, and we must get TYPE_ALIGN set correctly on the array
6262 else if (TREE_CODE (type) == ARRAY_TYPE)
6265 if (TREE_STATIC (decl)
6266 && !at_function_scope_p ()
6267 && current_function_decl == NULL)
6268 /* So decl is a global variable or a static member of a
6269 non local class. Record the types it uses
6270 so that we can decide later to emit debug info for them. */
6271 record_types_used_by_current_var_decl (decl);
6273 else if (TREE_CODE (decl) == FIELD_DECL
6274 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6275 error ("non-static data member %qD has Java class type", decl);
6277 /* Add this declaration to the statement-tree. This needs to happen
6278 after the call to check_initializer so that the DECL_EXPR for a
6279 reference temp is added before the DECL_EXPR for the reference itself. */
6280 if (DECL_FUNCTION_SCOPE_P (decl))
6281 add_decl_expr (decl);
6283 /* Let the middle end know about variables and functions -- but not
6284 static data members in uninstantiated class templates. */
6285 if (TREE_CODE (decl) == VAR_DECL
6286 || TREE_CODE (decl) == FUNCTION_DECL)
6288 if (TREE_CODE (decl) == VAR_DECL)
6290 layout_var_decl (decl);
6291 maybe_commonize_var (decl);
6294 /* This needs to happen after the linkage is set. */
6295 determine_visibility (decl);
6297 if (var_definition_p && TREE_STATIC (decl))
6299 /* If a TREE_READONLY variable needs initialization
6300 at runtime, it is no longer readonly and we need to
6301 avoid MEM_READONLY_P being set on RTL created for it. */
6304 if (TREE_READONLY (decl))
6305 TREE_READONLY (decl) = 0;
6308 else if (was_readonly)
6309 TREE_READONLY (decl) = 1;
6312 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6314 /* Check for abstractness of the type. Notice that there is no
6315 need to strip array types here since the check for those types
6316 is already done within create_array_type_for_decl. */
6317 if (TREE_CODE (type) == FUNCTION_TYPE
6318 || TREE_CODE (type) == METHOD_TYPE)
6319 abstract_virtuals_error (decl, TREE_TYPE (type));
6321 abstract_virtuals_error (decl, type);
6323 if (TREE_TYPE (decl) == error_mark_node)
6324 /* No initialization required. */
6326 else if (TREE_CODE (decl) == FUNCTION_DECL)
6330 if (init == ridpointers[(int)RID_DEFAULT])
6332 /* An out-of-class default definition is defined at
6333 the point where it is explicitly defaulted. */
6334 if (DECL_DELETED_FN (decl))
6335 maybe_explain_implicit_delete (decl);
6336 else if (DECL_INITIAL (decl) == error_mark_node)
6337 synthesize_method (decl);
6340 error ("function %q#D is initialized like a variable", decl);
6342 /* else no initialization required. */
6344 else if (DECL_EXTERNAL (decl)
6345 && ! (DECL_LANG_SPECIFIC (decl)
6346 && DECL_NOT_REALLY_EXTERN (decl)))
6349 DECL_INITIAL (decl) = init;
6351 /* A variable definition. */
6352 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6353 /* Initialize the local variable. */
6354 initialize_local_var (decl, init);
6356 /* If a variable is defined, and then a subsequent
6357 definition with external linkage is encountered, we will
6358 get here twice for the same variable. We want to avoid
6359 calling expand_static_init more than once. For variables
6360 that are not static data members, we can call
6361 expand_static_init only when we actually process the
6362 initializer. It is not legal to redeclare a static data
6363 member, so this issue does not arise in that case. */
6364 else if (var_definition_p && TREE_STATIC (decl))
6365 expand_static_init (decl, init);
6368 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6369 reference, insert it in the statement-tree now. */
6371 push_cleanup (decl, cleanup, false);
6374 TREE_READONLY (decl) = 1;
6376 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6379 /* Returns a declaration for a VAR_DECL as if:
6381 extern "C" TYPE NAME;
6383 had been seen. Used to create compiler-generated global
6387 declare_global_var (tree name, tree type)
6391 push_to_top_level ();
6392 decl = build_decl (input_location, VAR_DECL, name, type);
6393 TREE_PUBLIC (decl) = 1;
6394 DECL_EXTERNAL (decl) = 1;
6395 DECL_ARTIFICIAL (decl) = 1;
6396 /* If the user has explicitly declared this variable (perhaps
6397 because the code we are compiling is part of a low-level runtime
6398 library), then it is possible that our declaration will be merged
6399 with theirs by pushdecl. */
6400 decl = pushdecl (decl);
6401 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6402 pop_from_top_level ();
6407 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6408 if "__cxa_atexit" is not being used) corresponding to the function
6409 to be called when the program exits. */
6412 get_atexit_fn_ptr_type (void)
6416 if (!atexit_fn_ptr_type_node)
6419 if (flag_use_cxa_atexit
6420 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6421 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6422 arg_type = ptr_type_node;
6424 /* The parameter to "atexit" is "void (*)(void)". */
6425 arg_type = NULL_TREE;
6427 fn_type = build_function_type_list (void_type_node,
6428 arg_type, NULL_TREE);
6429 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6432 return atexit_fn_ptr_type_node;
6435 /* Returns a pointer to the `atexit' function. Note that if
6436 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6437 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6440 get_atexit_node (void)
6446 bool use_aeabi_atexit;
6451 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6453 /* The declaration for `__cxa_atexit' is:
6455 int __cxa_atexit (void (*)(void *), void *, void *)
6457 We build up the argument types and then the function type
6459 tree argtype0, argtype1, argtype2;
6461 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6462 /* First, build the pointer-to-function type for the first
6464 fn_ptr_type = get_atexit_fn_ptr_type ();
6465 /* Then, build the rest of the argument types. */
6466 argtype2 = ptr_type_node;
6467 if (use_aeabi_atexit)
6469 argtype1 = fn_ptr_type;
6470 argtype0 = ptr_type_node;
6474 argtype1 = ptr_type_node;
6475 argtype0 = fn_ptr_type;
6477 /* And the final __cxa_atexit type. */
6478 fn_type = build_function_type_list (integer_type_node,
6479 argtype0, argtype1, argtype2,
6481 fn_ptr_type = build_pointer_type (fn_type);
6482 if (use_aeabi_atexit)
6483 name = "__aeabi_atexit";
6485 name = "__cxa_atexit";
6489 /* The declaration for `atexit' is:
6491 int atexit (void (*)());
6493 We build up the argument types and then the function type
6495 fn_ptr_type = get_atexit_fn_ptr_type ();
6496 /* Build the final atexit type. */
6497 fn_type = build_function_type_list (integer_type_node,
6498 fn_ptr_type, NULL_TREE);
6502 /* Now, build the function declaration. */
6503 push_lang_context (lang_name_c);
6504 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6505 mark_used (atexit_fndecl);
6506 pop_lang_context ();
6507 atexit_node = decay_conversion (atexit_fndecl);
6512 /* Returns the __dso_handle VAR_DECL. */
6515 get_dso_handle_node (void)
6517 if (dso_handle_node)
6518 return dso_handle_node;
6520 /* Declare the variable. */
6521 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6524 #ifdef HAVE_GAS_HIDDEN
6525 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6526 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6529 return dso_handle_node;
6532 /* Begin a new function with internal linkage whose job will be simply
6533 to destroy some particular variable. */
6535 static GTY(()) int start_cleanup_cnt;
6538 start_cleanup_fn (void)
6543 bool use_cxa_atexit = flag_use_cxa_atexit
6544 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6546 push_to_top_level ();
6548 /* No need to mangle this. */
6549 push_lang_context (lang_name_c);
6551 /* Build the name of the function. */
6552 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6553 /* Build the function declaration. */
6554 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6555 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6556 /* It's a function with internal linkage, generated by the
6558 TREE_PUBLIC (fndecl) = 0;
6559 DECL_ARTIFICIAL (fndecl) = 1;
6560 /* Make the function `inline' so that it is only emitted if it is
6561 actually needed. It is unlikely that it will be inlined, since
6562 it is only called via a function pointer, but we avoid unnecessary
6563 emissions this way. */
6564 DECL_DECLARED_INLINE_P (fndecl) = 1;
6565 DECL_INTERFACE_KNOWN (fndecl) = 1;
6566 /* Build the parameter. */
6571 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6572 DECL_CONTEXT (parmdecl) = fndecl;
6573 TREE_USED (parmdecl) = 1;
6574 DECL_READ_P (parmdecl) = 1;
6575 DECL_ARGUMENTS (fndecl) = parmdecl;
6579 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6581 pop_lang_context ();
6583 return current_function_decl;
6586 /* Finish the cleanup function begun by start_cleanup_fn. */
6589 end_cleanup_fn (void)
6591 expand_or_defer_fn (finish_function (0));
6593 pop_from_top_level ();
6596 /* Generate code to handle the destruction of DECL, an object with
6597 static storage duration. */
6600 register_dtor_fn (tree decl)
6607 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6609 type = TREE_TYPE (decl);
6610 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6611 return void_zero_node;
6613 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6614 a class object, we can just pass the destructor to
6615 "__cxa_atexit"; we don't have to build a temporary function to do
6617 use_dtor = (flag_use_cxa_atexit
6618 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6619 && CLASS_TYPE_P (type));
6624 /* Find the destructor. */
6625 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6626 gcc_assert (idx >= 0);
6627 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6628 /* Make sure it is accessible. */
6629 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6633 /* Call build_cleanup before we enter the anonymous function so
6634 that any access checks will be done relative to the current
6635 scope, rather than the scope of the anonymous function. */
6636 build_cleanup (decl);
6638 /* Now start the function. */
6639 cleanup = start_cleanup_fn ();
6641 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6642 to the original function, rather than the anonymous one. That
6643 will make the back end think that nested functions are in use,
6644 which causes confusion. */
6645 push_deferring_access_checks (dk_no_check);
6646 fcall = build_cleanup (decl);
6647 pop_deferring_access_checks ();
6649 /* Create the body of the anonymous function. */
6650 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6651 finish_expr_stmt (fcall);
6652 finish_compound_stmt (compound_stmt);
6656 /* Call atexit with the cleanup function. */
6657 mark_used (cleanup);
6658 cleanup = build_address (cleanup);
6659 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6665 /* We must convert CLEANUP to the type that "__cxa_atexit"
6667 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6668 /* "__cxa_atexit" will pass the address of DECL to the
6669 cleanup function. */
6671 addr = build_address (decl);
6672 /* The declared type of the parameter to "__cxa_atexit" is
6673 "void *". For plain "T*", we could just let the
6674 machinery in cp_build_function_call convert it -- but if the
6675 type is "cv-qualified T *", then we need to convert it
6676 before passing it in, to avoid spurious errors. */
6677 addr = build_nop (ptr_type_node, addr);
6680 /* Since the cleanup functions we build ignore the address
6681 they're given, there's no reason to pass the actual address
6682 in, and, in general, it's cheaper to pass NULL than any
6684 addr = null_pointer_node;
6685 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6686 tf_warning_or_error);
6687 if (targetm.cxx.use_aeabi_atexit ())
6700 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6701 arg0, arg1, arg2, NULL_TREE);
6704 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6705 is its initializer. Generate code to handle the construction
6706 and destruction of DECL. */
6709 expand_static_init (tree decl, tree init)
6711 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6712 gcc_assert (TREE_STATIC (decl));
6714 /* Some variables require no dynamic initialization. */
6716 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6719 if (DECL_FUNCTION_SCOPE_P (decl))
6721 /* Emit code to perform this initialization but once. */
6722 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6723 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6724 tree guard, guard_addr;
6727 /* Emit code to perform this initialization but once. This code
6730 static <type> guard;
6731 if (!guard.first_byte) {
6732 if (__cxa_guard_acquire (&guard)) {
6735 // Do initialization.
6736 flag = true; __cxa_guard_release (&guard);
6737 // Register variable for destruction at end of program.
6739 if (!flag) __cxa_guard_abort (&guard);
6743 Note that the `flag' variable is only set to 1 *after* the
6744 initialization is complete. This ensures that an exception,
6745 thrown during the construction, will cause the variable to
6746 reinitialized when we pass through this code again, as per:
6750 If the initialization exits by throwing an exception, the
6751 initialization is not complete, so it will be tried again
6752 the next time control enters the declaration.
6754 This process should be thread-safe, too; multiple threads
6755 should not be able to initialize the variable more than
6758 /* Create the guard variable. */
6759 guard = get_guard (decl);
6761 /* This optimization isn't safe on targets with relaxed memory
6762 consistency. On such targets we force synchronization in
6763 __cxa_guard_acquire. */
6764 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6766 /* Begin the conditional initialization. */
6767 if_stmt = begin_if_stmt ();
6768 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6769 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6772 if (flag_threadsafe_statics)
6774 tree vfntype = NULL_TREE;
6775 tree acquire_name, release_name, abort_name;
6776 tree acquire_fn, release_fn, abort_fn;
6777 guard_addr = build_address (guard);
6779 acquire_name = get_identifier ("__cxa_guard_acquire");
6780 release_name = get_identifier ("__cxa_guard_release");
6781 abort_name = get_identifier ("__cxa_guard_abort");
6782 acquire_fn = identifier_global_value (acquire_name);
6783 release_fn = identifier_global_value (release_name);
6784 abort_fn = identifier_global_value (abort_name);
6786 acquire_fn = push_library_fn
6787 (acquire_name, build_function_type_list (integer_type_node,
6788 TREE_TYPE (guard_addr),
6791 if (!release_fn || !abort_fn)
6792 vfntype = build_function_type_list (void_type_node,
6793 TREE_TYPE (guard_addr),
6796 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6798 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6800 inner_if_stmt = begin_if_stmt ();
6801 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6804 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6805 begin = get_target_expr (boolean_false_node);
6806 flag = TARGET_EXPR_SLOT (begin);
6808 TARGET_EXPR_CLEANUP (begin)
6809 = build3 (COND_EXPR, void_type_node, flag,
6811 build_call_n (abort_fn, 1, guard_addr));
6812 CLEANUP_EH_ONLY (begin) = 1;
6814 /* Do the initialization itself. */
6815 init = add_stmt_to_compound (begin, init);
6816 init = add_stmt_to_compound
6817 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6818 init = add_stmt_to_compound
6819 (init, build_call_n (release_fn, 1, guard_addr));
6822 init = add_stmt_to_compound (init, set_guard (guard));
6824 /* Use atexit to register a function for destroying this static
6826 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6828 finish_expr_stmt (init);
6830 if (flag_threadsafe_statics)
6832 finish_compound_stmt (inner_then_clause);
6833 finish_then_clause (inner_if_stmt);
6834 finish_if_stmt (inner_if_stmt);
6837 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6839 finish_compound_stmt (then_clause);
6840 finish_then_clause (if_stmt);
6841 finish_if_stmt (if_stmt);
6845 static_aggregates = tree_cons (init, decl, static_aggregates);
6849 /* Make TYPE a complete type based on INITIAL_VALUE.
6850 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6851 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6852 3 if the initializer list is empty (in pedantic mode). */
6855 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6858 tree type, elt_type;
6862 unsigned HOST_WIDE_INT i;
6865 /* An array of character type can be initialized from a
6866 brace-enclosed string constant.
6868 FIXME: this code is duplicated from reshape_init. Probably
6869 we should just call reshape_init here? */
6870 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6871 && TREE_CODE (initial_value) == CONSTRUCTOR
6872 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6874 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6875 tree value = VEC_index (constructor_elt, v, 0)->value;
6877 if (TREE_CODE (value) == STRING_CST
6878 && VEC_length (constructor_elt, v) == 1)
6879 initial_value = value;
6882 /* If any of the elements are parameter packs, we can't actually
6883 complete this type now because the array size is dependent. */
6884 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6886 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6889 if (PACK_EXPANSION_P (value))
6895 failure = complete_array_type (ptype, initial_value, do_default);
6897 /* We can create the array before the element type is complete, which
6898 means that we didn't have these two bits set in the original type
6899 either. In completing the type, we are expected to propagate these
6900 bits. See also complete_type which does the same thing for arrays
6903 if (TYPE_DOMAIN (type))
6905 elt_type = TREE_TYPE (type);
6906 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6907 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6908 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6914 /* As above, but either give an error or reject zero-size arrays, depending
6918 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6919 bool do_default, tsubst_flags_t complain)
6922 bool sfinae = !(complain & tf_error);
6923 /* In SFINAE context we can't be lenient about zero-size arrays. */
6926 failure = cp_complete_array_type (ptype, initial_value, do_default);
6932 /* Not an error. */;
6933 else if (failure == 1)
6934 error ("initializer fails to determine size of %qT", *ptype);
6935 else if (failure == 2)
6938 error ("array size missing in %qT", *ptype);
6940 else if (failure == 3)
6941 error ("zero-size array %qT", *ptype);
6942 *ptype = error_mark_node;
6947 /* Return zero if something is declared to be a member of type
6948 CTYPE when in the context of CUR_TYPE. STRING is the error
6949 message to print in that case. Otherwise, quietly return 1. */
6952 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6954 if (ctype && ctype != cur_type)
6956 if (flags == DTOR_FLAG)
6957 error ("destructor for alien class %qT cannot be a member", ctype);
6959 error ("constructor for alien class %qT cannot be a member", ctype);
6965 /* Subroutine of `grokdeclarator'. */
6967 /* Generate errors possibly applicable for a given set of specifiers.
6968 This is for ARM $7.1.2. */
6971 bad_specifiers (tree object,
6972 enum bad_spec_place type,
6983 error ("%qD declared as a %<virtual%> variable", object);
6985 error ("%qD declared as an %<inline%> variable", object);
6987 error ("%<const%> and %<volatile%> function specifiers on "
6988 "%qD invalid in variable declaration", object);
6992 error ("%qD declared as a %<virtual%> parameter", object);
6994 error ("%qD declared as an %<inline%> parameter", object);
6996 error ("%<const%> and %<volatile%> function specifiers on "
6997 "%qD invalid in parameter declaration", object);
7001 error ("%qD declared as a %<virtual%> type", object);
7003 error ("%qD declared as an %<inline%> type", object);
7005 error ("%<const%> and %<volatile%> function specifiers on "
7006 "%qD invalid in type declaration", object);
7010 error ("%qD declared as a %<virtual%> field", object);
7012 error ("%qD declared as an %<inline%> field", object);
7014 error ("%<const%> and %<volatile%> function specifiers on "
7015 "%qD invalid in field declaration", object);
7021 error ("%q+D declared as a friend", object);
7023 && (TREE_CODE (object) == TYPE_DECL
7024 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7025 && !TYPE_REFFN_P (TREE_TYPE (object))
7026 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7027 error ("%q+D declared with an exception specification", object);
7030 /* DECL is a member function or static data member and is presently
7031 being defined. Check that the definition is taking place in a
7035 check_class_member_definition_namespace (tree decl)
7037 /* These checks only apply to member functions and static data
7039 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7040 || TREE_CODE (decl) == VAR_DECL);
7041 /* We check for problems with specializations in pt.c in
7042 check_specialization_namespace, where we can issue better
7044 if (processing_specialization)
7046 /* There are no restrictions on the placement of
7047 explicit instantiations. */
7048 if (processing_explicit_instantiation)
7052 A member function definition that appears outside of the
7053 class definition shall appear in a namespace scope enclosing
7054 the class definition.
7058 The definition for a static data member shall appear in a
7059 namespace scope enclosing the member's class definition. */
7060 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7061 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7062 decl, DECL_CONTEXT (decl));
7065 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7066 METHOD_TYPE for a non-static member function; QUALS are the
7067 cv-qualifiers that apply to the function. */
7070 build_this_parm (tree type, cp_cv_quals quals)
7075 cp_cv_quals this_quals;
7077 if (CLASS_TYPE_P (type))
7080 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7081 this_type = build_pointer_type (this_type);
7084 this_type = type_of_this_parm (type);
7085 /* The `this' parameter is implicitly `const'; it cannot be
7087 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7088 qual_type = cp_build_qualified_type (this_type, this_quals);
7089 parm = build_artificial_parm (this_identifier, qual_type);
7090 cp_apply_type_quals_to_decl (this_quals, parm);
7094 /* DECL is a static member function. Complain if it was declared
7095 with function-cv-quals. */
7098 check_static_quals (tree decl, cp_cv_quals quals)
7100 if (quals != TYPE_UNQUALIFIED)
7101 error ("static member function %q#D declared with type qualifiers",
7105 /* CTYPE is class type, or null if non-class.
7106 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7108 DECLARATOR is the function's name.
7109 PARMS is a chain of PARM_DECLs for the function.
7110 VIRTUALP is truthvalue of whether the function is virtual or not.
7111 FLAGS are to be passed through to `grokclassfn'.
7112 QUALS are qualifiers indicating whether the function is `const'
7114 RAISES is a list of exceptions that this function can raise.
7115 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7116 not look, and -1 if we should not call `grokclassfn' at all.
7118 SFK is the kind of special function (if any) for the new function.
7120 Returns `NULL_TREE' if something goes wrong, after issuing
7121 applicable error messages. */
7124 grokfndecl (tree ctype,
7128 tree orig_declarator,
7130 enum overload_flags flags,
7137 special_function_kind sfk,
7142 location_t location)
7145 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7149 type = build_exception_variant (type, raises);
7151 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7153 /* If we have an explicit location, use it, otherwise use whatever
7154 build_lang_decl used (probably input_location). */
7155 if (location != UNKNOWN_LOCATION)
7156 DECL_SOURCE_LOCATION (decl) = location;
7158 if (TREE_CODE (type) == METHOD_TYPE)
7161 parm = build_this_parm (type, quals);
7162 DECL_CHAIN (parm) = parms;
7165 DECL_ARGUMENTS (decl) = parms;
7166 for (t = parms; t; t = DECL_CHAIN (t))
7167 DECL_CONTEXT (t) = decl;
7168 /* Propagate volatile out from type to decl. */
7169 if (TYPE_VOLATILE (type))
7170 TREE_THIS_VOLATILE (decl) = 1;
7172 /* Setup decl according to sfk. */
7175 case sfk_constructor:
7176 case sfk_copy_constructor:
7177 case sfk_move_constructor:
7178 DECL_CONSTRUCTOR_P (decl) = 1;
7180 case sfk_destructor:
7181 DECL_DESTRUCTOR_P (decl) = 1;
7187 /* If pointers to member functions use the least significant bit to
7188 indicate whether a function is virtual, ensure a pointer
7189 to this function will have that bit clear. */
7190 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7191 && TREE_CODE (type) == METHOD_TYPE
7192 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7193 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7196 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7200 ("defining explicit specialization %qD in friend declaration",
7204 tree fns = TREE_OPERAND (orig_declarator, 0);
7205 tree args = TREE_OPERAND (orig_declarator, 1);
7207 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7209 /* Something like `template <class T> friend void f<T>()'. */
7210 error ("invalid use of template-id %qD in declaration "
7211 "of primary template",
7217 /* A friend declaration of the form friend void f<>(). Record
7218 the information in the TEMPLATE_ID_EXPR. */
7219 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7221 if (TREE_CODE (fns) == COMPONENT_REF)
7223 /* Due to bison parser ickiness, we will have already looked
7224 up an operator_name or PFUNCNAME within the current class
7225 (see template_id in parse.y). If the current class contains
7226 such a name, we'll get a COMPONENT_REF here. Undo that. */
7228 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7229 == current_class_type);
7230 fns = TREE_OPERAND (fns, 1);
7232 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7233 || TREE_CODE (fns) == OVERLOAD);
7234 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7236 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7237 if (TREE_PURPOSE (t)
7238 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7240 error ("default arguments are not allowed in declaration "
7241 "of friend template specialization %qD",
7248 error ("%<inline%> is not allowed in declaration of friend "
7249 "template specialization %qD",
7256 /* If this decl has namespace scope, set that up. */
7258 set_decl_namespace (decl, in_namespace, friendp);
7260 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7262 /* `main' and builtins have implicit 'C' linkage. */
7263 if ((MAIN_NAME_P (declarator)
7264 || (IDENTIFIER_LENGTH (declarator) > 10
7265 && IDENTIFIER_POINTER (declarator)[0] == '_'
7266 && IDENTIFIER_POINTER (declarator)[1] == '_'
7267 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7268 && current_lang_name == lang_name_cplusplus
7269 && ctype == NULL_TREE
7270 && DECL_FILE_SCOPE_P (decl))
7271 SET_DECL_LANGUAGE (decl, lang_c);
7273 /* Should probably propagate const out from type to decl I bet (mrs). */
7276 DECL_STATIC_FUNCTION_P (decl) = 1;
7277 DECL_CONTEXT (decl) = ctype;
7282 DECL_CONTEXT (decl) = ctype;
7284 check_class_member_definition_namespace (decl);
7287 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7289 if (processing_template_decl)
7290 error ("cannot declare %<::main%> to be a template");
7292 error ("cannot declare %<::main%> to be inline");
7294 error ("cannot declare %<::main%> to be static");
7299 /* Members of anonymous types and local classes have no linkage; make
7300 them internal. If a typedef is made later, this will be changed. */
7301 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7302 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7305 if (publicp && cxx_dialect == cxx98)
7307 /* [basic.link]: A name with no linkage (notably, the name of a class
7308 or enumeration declared in a local scope) shall not be used to
7309 declare an entity with linkage.
7311 DR 757 relaxes this restriction for C++0x. */
7312 t = no_linkage_check (TREE_TYPE (decl),
7313 /*relaxed_p=*/false);
7316 if (TYPE_ANONYMOUS_P (t))
7318 if (DECL_EXTERN_C_P (decl))
7319 /* Allow this; it's pretty common in C. */;
7322 permerror (input_location, "anonymous type with no linkage "
7323 "used to declare function %q#D with linkage",
7325 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7326 permerror (input_location, "%q+#D does not refer to the unqualified "
7327 "type, so it is not used for linkage",
7332 permerror (input_location, "type %qT with no linkage used to "
7333 "declare function %q#D with linkage", t, decl);
7337 TREE_PUBLIC (decl) = publicp;
7340 DECL_INTERFACE_KNOWN (decl) = 1;
7341 DECL_NOT_REALLY_EXTERN (decl) = 1;
7344 /* If the declaration was declared inline, mark it as such. */
7346 DECL_DECLARED_INLINE_P (decl) = 1;
7348 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7350 DECL_EXTERNAL (decl) = 1;
7351 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7354 ? G_("static member function %qD cannot have cv-qualifier")
7355 : G_("non-member function %qD cannot have cv-qualifier"),
7357 quals = TYPE_UNQUALIFIED;
7360 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7361 && !grok_op_properties (decl, /*complain=*/true))
7363 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7365 bool long_long_unsigned_p;
7367 const char *suffix = NULL;
7368 /* [over.literal]/6: Literal operators shall not have C linkage. */
7369 if (DECL_LANGUAGE (decl) == lang_c)
7371 error ("literal operator with C linkage");
7375 if (DECL_NAMESPACE_SCOPE_P (decl))
7377 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7380 error ("%qD has invalid argument list", decl);
7384 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7385 if (long_long_unsigned_p)
7387 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7388 warning (0, "integer suffix %<%s%>"
7389 " shadowed by implementation", suffix);
7391 else if (long_double_p)
7393 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7394 warning (0, "floating point suffix %<%s%>"
7395 " shadowed by implementation", suffix);
7400 error ("%qD must be a non-member function", decl);
7406 /* Make the init_value nonzero so pushdecl knows this is not
7407 tentative. error_mark_node is replaced later with the BLOCK. */
7408 DECL_INITIAL (decl) = error_mark_node;
7410 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7411 TREE_NOTHROW (decl) = 1;
7413 /* Caller will do the rest of this. */
7417 if (ctype != NULL_TREE)
7418 grokclassfn (ctype, decl, flags);
7420 decl = check_explicit_specialization (orig_declarator, decl,
7423 4 * (friendp != 0));
7424 if (decl == error_mark_node)
7427 if (DECL_STATIC_FUNCTION_P (decl))
7428 check_static_quals (decl, quals);
7432 cplus_decl_attributes (&decl, *attrlist, 0);
7433 *attrlist = NULL_TREE;
7436 /* Check main's type after attributes have been applied. */
7437 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7439 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7442 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7444 error ("%<::main%> must return %<int%>");
7445 newtype = build_function_type (integer_type_node, oldtypeargs);
7446 TREE_TYPE (decl) = newtype;
7449 check_main_parameter_types (decl);
7452 if (ctype != NULL_TREE
7453 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7456 tree old_decl = check_classfn (ctype, decl,
7457 (processing_template_decl
7458 > template_class_depth (ctype))
7459 ? current_template_parms
7462 if (old_decl == error_mark_node)
7470 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7471 /* Because grokfndecl is always supposed to return a
7472 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7473 here. We depend on our callers to figure out that its
7474 really a template that's being returned. */
7475 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7477 if (DECL_STATIC_FUNCTION_P (old_decl)
7478 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7480 /* Remove the `this' parm added by grokclassfn. */
7481 revert_static_member_fn (decl);
7482 check_static_quals (decl, quals);
7484 if (DECL_ARTIFICIAL (old_decl))
7486 error ("definition of implicitly-declared %qD", old_decl);
7489 else if (DECL_DEFAULTED_FN (old_decl))
7491 error ("definition of explicitly-defaulted %q+D", decl);
7492 error ("%q+#D explicitly defaulted here", old_decl);
7496 /* Since we've smashed OLD_DECL to its
7497 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7498 if (TREE_CODE (decl) == TEMPLATE_DECL)
7499 decl = DECL_TEMPLATE_RESULT (decl);
7501 /* Attempt to merge the declarations. This can fail, in
7502 the case of some invalid specialization declarations. */
7503 pushed_scope = push_scope (ctype);
7504 ok = duplicate_decls (decl, old_decl, friendp);
7506 pop_scope (pushed_scope);
7509 error ("no %q#D member function declared in class %qT",
7517 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7520 if (ctype == NULL_TREE || check)
7524 DECL_VIRTUAL_P (decl) = 1;
7529 /* decl is a FUNCTION_DECL.
7530 specifiers are the parsed virt-specifiers.
7532 Set flags to reflect the virt-specifiers.
7537 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7539 if (decl == NULL_TREE)
7541 if (specifiers & VIRT_SPEC_OVERRIDE)
7542 DECL_OVERRIDE_P (decl) = 1;
7543 if (specifiers & VIRT_SPEC_FINAL)
7544 DECL_FINAL_P (decl) = 1;
7548 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7549 the linkage that DECL will receive in the object file. */
7552 set_linkage_for_static_data_member (tree decl)
7554 /* A static data member always has static storage duration and
7555 external linkage. Note that static data members are forbidden in
7556 local classes -- the only situation in which a class has
7557 non-external linkage. */
7558 TREE_PUBLIC (decl) = 1;
7559 TREE_STATIC (decl) = 1;
7560 /* For non-template classes, static data members are always put
7561 out in exactly those files where they are defined, just as
7562 with ordinary namespace-scope variables. */
7563 if (!processing_template_decl)
7564 DECL_INTERFACE_KNOWN (decl) = 1;
7567 /* Create a VAR_DECL named NAME with the indicated TYPE.
7569 If SCOPE is non-NULL, it is the class type or namespace containing
7570 the variable. If SCOPE is NULL, the variable should is created in
7571 the innermost enclosings scope. */
7574 grokvardecl (tree type,
7576 const cp_decl_specifier_seq *declspecs,
7582 tree explicit_scope;
7584 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7586 /* Compute the scope in which to place the variable, but remember
7587 whether or not that scope was explicitly specified by the user. */
7588 explicit_scope = scope;
7591 /* An explicit "extern" specifier indicates a namespace-scope
7593 if (declspecs->storage_class == sc_extern)
7594 scope = current_decl_namespace ();
7595 else if (!at_function_scope_p ())
7596 scope = current_scope ();
7600 && (/* If the variable is a namespace-scope variable declared in a
7601 template, we need DECL_LANG_SPECIFIC. */
7602 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7603 /* Similarly for namespace-scope variables with language linkage
7605 || (TREE_CODE (scope) == NAMESPACE_DECL
7606 && current_lang_name != lang_name_cplusplus)
7607 /* Similarly for static data members. */
7609 decl = build_lang_decl (VAR_DECL, name, type);
7611 decl = build_decl (input_location, VAR_DECL, name, type);
7613 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7614 set_decl_namespace (decl, explicit_scope, 0);
7616 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7618 if (declspecs->storage_class == sc_extern)
7620 DECL_THIS_EXTERN (decl) = 1;
7621 DECL_EXTERNAL (decl) = !initialized;
7624 if (DECL_CLASS_SCOPE_P (decl))
7626 set_linkage_for_static_data_member (decl);
7627 /* This function is only called with out-of-class definitions. */
7628 DECL_EXTERNAL (decl) = 0;
7629 check_class_member_definition_namespace (decl);
7631 /* At top level, either `static' or no s.c. makes a definition
7632 (perhaps tentative), and absence of `static' makes it public. */
7633 else if (toplevel_bindings_p ())
7635 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7636 && (DECL_THIS_EXTERN (decl) || ! constp));
7637 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7639 /* Not at top level, only `static' makes a static definition. */
7642 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7643 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7646 if (declspecs->specs[(int)ds_thread])
7647 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7649 /* If the type of the decl has no linkage, make sure that we'll
7650 notice that in mark_used. */
7651 if (cxx_dialect > cxx98
7652 && decl_linkage (decl) != lk_none
7653 && DECL_LANG_SPECIFIC (decl) == NULL
7654 && !DECL_EXTERN_C_P (decl)
7655 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7656 retrofit_lang_decl (decl);
7658 if (TREE_PUBLIC (decl))
7660 /* [basic.link]: A name with no linkage (notably, the name of a class
7661 or enumeration declared in a local scope) shall not be used to
7662 declare an entity with linkage.
7664 DR 757 relaxes this restriction for C++0x. */
7665 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7666 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7669 if (TYPE_ANONYMOUS_P (t))
7671 if (DECL_EXTERN_C_P (decl))
7672 /* Allow this; it's pretty common in C. */
7676 /* DRs 132, 319 and 389 seem to indicate types with
7677 no linkage can only be used to declare extern "C"
7678 entities. Since it's not always an error in the
7679 ISO C++ 90 Standard, we only issue a warning. */
7680 warning (0, "anonymous type with no linkage used to declare "
7681 "variable %q#D with linkage", decl);
7682 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7683 warning (0, "%q+#D does not refer to the unqualified "
7684 "type, so it is not used for linkage",
7689 warning (0, "type %qT with no linkage used to declare variable "
7690 "%q#D with linkage", t, decl);
7694 DECL_INTERFACE_KNOWN (decl) = 1;
7699 /* Create and return a canonical pointer to member function type, for
7700 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7703 build_ptrmemfunc_type (tree type)
7707 tree unqualified_variant = NULL_TREE;
7709 if (type == error_mark_node)
7712 /* If a canonical type already exists for this type, use it. We use
7713 this method instead of type_hash_canon, because it only does a
7714 simple equality check on the list of field members. */
7716 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7719 /* Make sure that we always have the unqualified pointer-to-member
7721 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7723 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7725 t = make_class_type (RECORD_TYPE);
7726 xref_basetypes (t, NULL_TREE);
7728 /* Let the front end know this is a pointer to member function... */
7729 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7730 /* ... and not really a class type. */
7731 SET_CLASS_TYPE_P (t, 0);
7733 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7736 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7738 DECL_CHAIN (field) = fields;
7741 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7743 /* Zap out the name so that the back end will give us the debugging
7744 information for this anonymous RECORD_TYPE. */
7745 TYPE_NAME (t) = NULL_TREE;
7747 /* If this is not the unqualified form of this pointer-to-member
7748 type, set the TYPE_MAIN_VARIANT for this type to be the
7749 unqualified type. Since they are actually RECORD_TYPEs that are
7750 not variants of each other, we must do this manually.
7751 As we just built a new type there is no need to do yet another copy. */
7752 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7754 int type_quals = cp_type_quals (type);
7755 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7756 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7757 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7758 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7759 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7760 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7761 TREE_TYPE (TYPE_BINFO (t)) = t;
7764 /* Cache this pointer-to-member type so that we can find it again
7766 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7768 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7769 SET_TYPE_STRUCTURAL_EQUALITY (t);
7770 else if (TYPE_CANONICAL (type) != type)
7771 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7776 /* Create and return a pointer to data member type. */
7779 build_ptrmem_type (tree class_type, tree member_type)
7781 if (TREE_CODE (member_type) == METHOD_TYPE)
7783 cp_cv_quals quals = type_memfn_quals (member_type);
7784 member_type = build_memfn_type (member_type, class_type, quals);
7785 return build_ptrmemfunc_type (build_pointer_type (member_type));
7789 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7790 return build_offset_type (class_type, member_type);
7794 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7795 Check to see that the definition is valid. Issue appropriate error
7796 messages. Return 1 if the definition is particularly bad, or 0
7800 check_static_variable_definition (tree decl, tree type)
7802 /* Can't check yet if we don't know the type. */
7803 if (dependent_type_p (type))
7805 /* If DECL is declared constexpr, we'll do the appropriate checks
7806 in check_initializer. */
7807 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7809 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7811 if (literal_type_p (type))
7812 permerror (input_location,
7813 "%<constexpr%> needed for in-class initialization of "
7814 "static data member %q#D of non-integral type", decl);
7816 error ("in-class initialization of static data member %q#D of "
7817 "non-literal type", decl);
7821 /* Motion 10 at San Diego: If a static const integral data member is
7822 initialized with an integral constant expression, the initializer
7823 may appear either in the declaration (within the class), or in
7824 the definition, but not both. If it appears in the class, the
7825 member is a member constant. The file-scope definition is always
7827 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7829 error ("invalid in-class initialization of static data member "
7830 "of non-integral type %qT",
7834 else if (!CP_TYPE_CONST_P (type))
7835 error ("ISO C++ forbids in-class initialization of non-const "
7836 "static member %qD",
7838 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7839 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7840 "%qD of non-integral type %qT", decl, type);
7845 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7846 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7847 expressions out into temporary variables so that walk_tree doesn't
7848 step into them (c++/15764). */
7851 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7853 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7854 tree expr = *expr_p;
7855 if (TREE_CODE (expr) == SAVE_EXPR)
7857 tree op = TREE_OPERAND (expr, 0);
7858 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7859 if (TREE_SIDE_EFFECTS (op))
7860 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7863 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7868 /* Entry point for the above. */
7871 stabilize_vla_size (tree size)
7873 struct pointer_set_t *pset = pointer_set_create ();
7874 /* Break out any function calls into temporary variables. */
7875 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7878 /* Given the SIZE (i.e., number of elements) in an array, compute an
7879 appropriate index type for the array. If non-NULL, NAME is the
7880 name of the thing being declared. */
7883 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7888 tree abi_1_itype = NULL_TREE;
7890 if (error_operand_p (size))
7891 return error_mark_node;
7893 type = TREE_TYPE (size);
7894 /* type_dependent_expression_p? */
7895 if (!dependent_type_p (type))
7897 mark_rvalue_use (size);
7899 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7900 && TREE_SIDE_EFFECTS (size))
7901 /* In C++98, we mark a non-constant array bound with a magic
7902 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7905 size = fold_non_dependent_expr (size);
7907 if (CLASS_TYPE_P (type)
7908 && CLASSTYPE_LITERAL_P (type))
7910 size = build_expr_type_conversion (WANT_INT, size, true);
7913 if (!(complain & tf_error))
7914 return error_mark_node;
7916 error ("size of array %qD has non-integral type %qT",
7919 error ("size of array has non-integral type %qT", type);
7920 size = integer_one_node;
7922 if (size == error_mark_node)
7923 return error_mark_node;
7924 type = TREE_TYPE (size);
7925 /* We didn't support this case in GCC 3.2, so don't bother
7926 trying to model it now in ABI v1. */
7927 abi_1_itype = error_mark_node;
7930 size = maybe_constant_value (size);
7931 if (!TREE_CONSTANT (size))
7935 if (error_operand_p (size))
7936 return error_mark_node;
7938 /* The array bound must be an integer type. */
7939 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7941 if (!(complain & tf_error))
7942 return error_mark_node;
7944 error ("size of array %qD has non-integral type %qT", name, type);
7946 error ("size of array has non-integral type %qT", type);
7947 size = integer_one_node;
7948 type = TREE_TYPE (size);
7952 /* A type is dependent if it is...an array type constructed from any
7953 dependent type or whose size is specified by a constant expression
7954 that is value-dependent. */
7955 /* We can only call value_dependent_expression_p on integral constant
7956 expressions; treat non-constant expressions as dependent, too. */
7957 if (processing_template_decl
7958 && (dependent_type_p (type)
7959 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7961 /* We cannot do any checking for a SIZE that isn't known to be
7962 constant. Just build the index type and mark that it requires
7963 structural equality checks. */
7964 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7965 size, integer_one_node));
7966 TYPE_DEPENDENT_P (itype) = 1;
7967 TYPE_DEPENDENT_P_VALID (itype) = 1;
7968 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7972 if (!abi_version_at_least (2) && processing_template_decl
7973 && abi_1_itype == NULL_TREE)
7974 /* For abi-1, we handled all instances in templates the same way,
7975 even when they were non-dependent. This affects the manglings
7976 produced. So, we do the normal checking for non-dependent
7977 sizes, but at the end we'll return the same type that abi-1
7978 would have, but with TYPE_CANONICAL set to the "right"
7979 value that the current ABI would provide. */
7980 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7981 osize, integer_one_node));
7983 /* Normally, the array-bound will be a constant. */
7984 if (TREE_CODE (size) == INTEGER_CST)
7986 /* Check to see if the array bound overflowed. Make that an
7987 error, no matter how generous we're being. */
7988 constant_expression_error (size);
7990 /* An array must have a positive number of elements. */
7991 if (INT_CST_LT (size, integer_zero_node))
7993 if (!(complain & tf_error))
7994 return error_mark_node;
7996 error ("size of array %qD is negative", name);
7998 error ("size of array is negative");
7999 size = integer_one_node;
8001 /* As an extension we allow zero-sized arrays. */
8002 else if (integer_zerop (size))
8004 if (!(complain & tf_error))
8005 /* We must fail if performing argument deduction (as
8006 indicated by the state of complain), so that
8007 another substitution can be found. */
8008 return error_mark_node;
8009 else if (in_system_header)
8010 /* Allow them in system headers because glibc uses them. */;
8012 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
8014 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
8017 else if (TREE_CONSTANT (size)
8018 /* We don't allow VLAs at non-function scopes, or during
8019 tentative template substitution. */
8020 || !at_function_scope_p () || !(complain & tf_error))
8022 if (!(complain & tf_error))
8023 return error_mark_node;
8024 /* `(int) &fn' is not a valid array bound. */
8026 error ("size of array %qD is not an integral constant-expression",
8029 error ("size of array is not an integral constant-expression");
8030 size = integer_one_node;
8032 else if (pedantic && warn_vla != 0)
8035 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8037 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8039 else if (warn_vla > 0)
8043 "variable length array %qD is used", name);
8046 "variable length array is used");
8049 if (processing_template_decl && !TREE_CONSTANT (size))
8050 /* A variable sized array. */
8051 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8054 HOST_WIDE_INT saved_processing_template_decl;
8056 /* Compute the index of the largest element in the array. It is
8057 one less than the number of elements in the array. We save
8058 and restore PROCESSING_TEMPLATE_DECL so that computations in
8059 cp_build_binary_op will be appropriately folded. */
8060 saved_processing_template_decl = processing_template_decl;
8061 processing_template_decl = 0;
8062 itype = cp_build_binary_op (input_location,
8064 cp_convert (ssizetype, size),
8065 cp_convert (ssizetype, integer_one_node),
8066 tf_warning_or_error);
8067 itype = fold (itype);
8068 processing_template_decl = saved_processing_template_decl;
8070 if (!TREE_CONSTANT (itype))
8071 /* A variable sized array. */
8072 itype = variable_size (itype);
8073 /* Make sure that there was no overflow when creating to a signed
8074 index type. (For example, on a 32-bit machine, an array with
8075 size 2^32 - 1 is too big.) */
8076 else if (TREE_CODE (itype) == INTEGER_CST
8077 && TREE_OVERFLOW (itype))
8079 if (!(complain & tf_error))
8080 return error_mark_node;
8081 error ("overflow in array dimension");
8082 TREE_OVERFLOW (itype) = 0;
8086 /* Create and return the appropriate index type. */
8087 if (abi_1_itype && abi_1_itype != error_mark_node)
8089 tree t = build_index_type (itype);
8090 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8091 itype = abi_1_itype;
8094 itype = build_index_type (itype);
8096 /* If the index type were dependent, we would have returned early, so
8097 remember that it isn't. */
8098 TYPE_DEPENDENT_P (itype) = 0;
8099 TYPE_DEPENDENT_P_VALID (itype) = 1;
8103 /* Returns the scope (if any) in which the entity declared by
8104 DECLARATOR will be located. If the entity was declared with an
8105 unqualified name, NULL_TREE is returned. */
8108 get_scope_of_declarator (const cp_declarator *declarator)
8110 while (declarator && declarator->kind != cdk_id)
8111 declarator = declarator->declarator;
8113 /* If the declarator-id is a SCOPE_REF, the scope in which the
8114 declaration occurs is the first operand. */
8116 && declarator->u.id.qualifying_scope)
8117 return declarator->u.id.qualifying_scope;
8119 /* Otherwise, the declarator is not a qualified name; the entity will
8120 be declared in the current scope. */
8124 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8125 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8129 create_array_type_for_decl (tree name, tree type, tree size)
8131 tree itype = NULL_TREE;
8133 /* If things have already gone awry, bail now. */
8134 if (type == error_mark_node || size == error_mark_node)
8135 return error_mark_node;
8137 /* 8.3.4/1: If the type of the identifier of D contains the auto
8138 type-specifier, the program is ill-formed. */
8139 if (pedantic && type_uses_auto (type))
8140 pedwarn (input_location, OPT_pedantic,
8141 "declaration of %qD as array of %<auto%>", name);
8143 /* If there are some types which cannot be array elements,
8144 issue an error-message and return. */
8145 switch (TREE_CODE (type))
8149 error ("declaration of %qD as array of void", name);
8151 error ("creating array of void");
8152 return error_mark_node;
8156 error ("declaration of %qD as array of functions", name);
8158 error ("creating array of functions");
8159 return error_mark_node;
8161 case REFERENCE_TYPE:
8163 error ("declaration of %qD as array of references", name);
8165 error ("creating array of references");
8166 return error_mark_node;
8170 error ("declaration of %qD as array of function members", name);
8172 error ("creating array of function members");
8173 return error_mark_node;
8181 The constant expressions that specify the bounds of the arrays
8182 can be omitted only for the first member of the sequence. */
8183 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8186 error ("declaration of %qD as multidimensional array must "
8187 "have bounds for all dimensions except the first",
8190 error ("multidimensional array must have bounds for all "
8191 "dimensions except the first");
8193 return error_mark_node;
8196 /* Figure out the index type for the array. */
8198 itype = compute_array_index_type (name, size, tf_warning_or_error);
8201 T is called the array element type; this type shall not be [...] an
8202 abstract class type. */
8203 abstract_virtuals_error (name, type);
8205 return build_cplus_array_type (type, itype);
8208 /* Check that it's OK to declare a function with the indicated TYPE.
8209 SFK indicates the kind of special function (if any) that this
8210 function is. OPTYPE is the type given in a conversion operator
8211 declaration, or the class type for a constructor/destructor.
8212 Returns the actual return type of the function; that
8213 may be different than TYPE if an error occurs, or for certain
8214 special functions. */
8217 check_special_function_return_type (special_function_kind sfk,
8223 case sfk_constructor:
8225 error ("return type specification for constructor invalid");
8227 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8228 type = build_pointer_type (optype);
8230 type = void_type_node;
8233 case sfk_destructor:
8235 error ("return type specification for destructor invalid");
8236 /* We can't use the proper return type here because we run into
8237 problems with ambiguous bases and covariant returns.
8238 Java classes are left unchanged because (void *) isn't a valid
8239 Java type, and we don't want to change the Java ABI. */
8240 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8241 type = build_pointer_type (void_type_node);
8243 type = void_type_node;
8246 case sfk_conversion:
8248 error ("return type specified for %<operator %T%>", optype);
8259 /* A variable or data member (whose unqualified name is IDENTIFIER)
8260 has been declared with the indicated TYPE. If the TYPE is not
8261 acceptable, issue an error message and return a type to use for
8262 error-recovery purposes. */
8265 check_var_type (tree identifier, tree type)
8267 if (VOID_TYPE_P (type))
8270 error ("unnamed variable or field declared void");
8271 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8273 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8274 error ("variable or field %qE declared void", identifier);
8277 error ("variable or field declared void");
8278 type = error_mark_node;
8284 /* Given declspecs and a declarator (abstract or otherwise), determine
8285 the name and type of the object declared and construct a DECL node
8288 DECLSPECS points to the representation of declaration-specifier
8289 sequence that precedes declarator.
8291 DECL_CONTEXT says which syntactic context this declaration is in:
8292 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8293 FUNCDEF for a function definition. Like NORMAL but a few different
8294 error messages in each case. Return value may be zero meaning
8295 this definition is too screwy to try to parse.
8296 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8297 handle member functions (which have FIELD context).
8298 Return value may be zero meaning this definition is too screwy to
8300 PARM for a parameter declaration (either within a function prototype
8301 or before a function body). Make a PARM_DECL, or return void_type_node.
8302 TPARM for a template parameter declaration.
8303 CATCHPARM for a parameter declaration before a catch clause.
8304 TYPENAME if for a typename (in a cast or sizeof).
8305 Don't make a DECL node; just return the ..._TYPE node.
8306 FIELD for a struct or union field; make a FIELD_DECL.
8307 BITFIELD for a field with specified width.
8309 INITIALIZED is as for start_decl.
8311 ATTRLIST is a pointer to the list of attributes, which may be NULL
8312 if there are none; *ATTRLIST may be modified if attributes from inside
8313 the declarator should be applied to the declaration.
8315 When this function is called, scoping variables (such as
8316 CURRENT_CLASS_TYPE) should reflect the scope in which the
8317 declaration occurs, not the scope in which the new declaration will
8318 be placed. For example, on:
8322 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8325 Returns a DECL (if a declarator is present), a TYPE (if there is no
8326 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8330 grokdeclarator (const cp_declarator *declarator,
8331 const cp_decl_specifier_seq *declspecs,
8332 enum decl_context decl_context,
8336 tree type = NULL_TREE;
8338 int explicit_int128 = 0;
8339 int virtualp, explicitp, friendp, inlinep, staticp;
8340 int explicit_int = 0;
8341 int explicit_char = 0;
8342 int defaulted_int = 0;
8343 tree dependent_name = NULL_TREE;
8345 tree typedef_decl = NULL_TREE;
8346 const char *name = NULL;
8347 tree typedef_type = NULL_TREE;
8348 /* True if this declarator is a function definition. */
8349 bool funcdef_flag = false;
8350 cp_declarator_kind innermost_code = cdk_error;
8353 /* See the code below that used this. */
8354 tree decl_attr = NULL_TREE;
8357 /* Keep track of what sort of function is being processed
8358 so that we can warn about default return values, or explicit
8359 return values which do not match prescribed defaults. */
8360 special_function_kind sfk = sfk_none;
8362 tree dname = NULL_TREE;
8363 tree ctor_return_type = NULL_TREE;
8364 enum overload_flags flags = NO_SPECIAL;
8365 /* cv-qualifiers that apply to the declarator, for a declaration of
8366 a member function. */
8367 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8368 /* virt-specifiers that apply to the declarator, for a declaration of
8369 a member function. */
8370 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8371 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8373 tree raises = NULL_TREE;
8374 int template_count = 0;
8375 tree returned_attrs = NULL_TREE;
8376 tree parms = NULL_TREE;
8377 const cp_declarator *id_declarator;
8378 /* The unqualified name of the declarator; either an
8379 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8380 tree unqualified_id;
8381 /* The class type, if any, in which this entity is located,
8382 or NULL_TREE if none. Note that this value may be different from
8383 the current class type; for example if an attempt is made to declare
8384 "A::f" inside "B", this value will be "A". */
8385 tree ctype = current_class_type;
8386 /* The NAMESPACE_DECL for the namespace in which this entity is
8387 located. If an unqualified name is used to declare the entity,
8388 this value will be NULL_TREE, even if the entity is located at
8390 tree in_namespace = NULL_TREE;
8391 cp_storage_class storage_class;
8392 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8393 bool type_was_error_mark_node = false;
8394 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8395 bool template_type_arg = false;
8396 bool template_parm_flag = false;
8397 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8400 signed_p = declspecs->specs[(int)ds_signed];
8401 unsigned_p = declspecs->specs[(int)ds_unsigned];
8402 short_p = declspecs->specs[(int)ds_short];
8403 long_p = declspecs->specs[(int)ds_long];
8404 longlong = declspecs->specs[(int)ds_long] >= 2;
8405 explicit_int128 = declspecs->explicit_int128_p;
8406 thread_p = declspecs->specs[(int)ds_thread];
8408 if (decl_context == FUNCDEF)
8409 funcdef_flag = true, decl_context = NORMAL;
8410 else if (decl_context == MEMFUNCDEF)
8411 funcdef_flag = true, decl_context = FIELD;
8412 else if (decl_context == BITFIELD)
8413 bitfield = 1, decl_context = FIELD;
8414 else if (decl_context == TEMPLATE_TYPE_ARG)
8415 template_type_arg = true, decl_context = TYPENAME;
8416 else if (decl_context == TPARM)
8417 template_parm_flag = true, decl_context = PARM;
8419 if (initialized > 1)
8420 funcdef_flag = true;
8422 /* Look inside a declarator for the name being declared
8423 and get it as a string, for an error message. */
8424 for (id_declarator = declarator;
8426 id_declarator = id_declarator->declarator)
8428 if (id_declarator->kind != cdk_id)
8429 innermost_code = id_declarator->kind;
8431 switch (id_declarator->kind)
8434 if (id_declarator->declarator
8435 && id_declarator->declarator->kind == cdk_id)
8437 sfk = id_declarator->declarator->u.id.sfk;
8438 if (sfk == sfk_destructor)
8445 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8446 tree decl = id_declarator->u.id.unqualified_name;
8449 if (qualifying_scope)
8451 if (at_function_scope_p ())
8455 A declarator-id shall not be qualified except
8458 None of the cases are permitted in block
8460 if (qualifying_scope == global_namespace)
8461 error ("invalid use of qualified-name %<::%D%>",
8463 else if (TYPE_P (qualifying_scope))
8464 error ("invalid use of qualified-name %<%T::%D%>",
8465 qualifying_scope, decl);
8467 error ("invalid use of qualified-name %<%D::%D%>",
8468 qualifying_scope, decl);
8469 return error_mark_node;
8471 else if (TYPE_P (qualifying_scope))
8473 ctype = qualifying_scope;
8474 if (!MAYBE_CLASS_TYPE_P (ctype))
8476 error ("%q#T is not a class or a namespace", ctype);
8479 else if (innermost_code != cdk_function
8480 && current_class_type
8481 && !UNIQUELY_DERIVED_FROM_P (ctype,
8482 current_class_type))
8484 error ("type %qT is not derived from type %qT",
8485 ctype, current_class_type);
8486 return error_mark_node;
8489 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8490 in_namespace = qualifying_scope;
8492 switch (TREE_CODE (decl))
8498 if (innermost_code != cdk_function)
8500 error ("declaration of %qD as non-function", decl);
8501 return error_mark_node;
8503 else if (!qualifying_scope
8504 && !(current_class_type && at_class_scope_p ()))
8506 error ("declaration of %qD as non-member", decl);
8507 return error_mark_node;
8510 type = TREE_OPERAND (decl, 0);
8512 type = constructor_name (type);
8513 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8518 case TEMPLATE_ID_EXPR:
8520 tree fns = TREE_OPERAND (decl, 0);
8523 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8525 gcc_assert (is_overloaded_fn (dname));
8526 dname = DECL_NAME (get_first_fn (dname));
8531 case IDENTIFIER_NODE:
8532 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8535 if (C_IS_RESERVED_WORD (dname))
8537 error ("declarator-id missing; using reserved word %qD",
8539 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8541 else if (!IDENTIFIER_TYPENAME_P (dname))
8542 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8545 gcc_assert (flags == NO_SPECIAL);
8546 flags = TYPENAME_FLAG;
8547 ctor_return_type = TREE_TYPE (dname);
8548 sfk = sfk_conversion;
8549 if (is_typename_at_global_scope (dname))
8550 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8552 name = "<invalid operator>";
8569 return error_mark_node;
8574 if (id_declarator->kind == cdk_id)
8580 The declarator in a function-definition shall have the form
8581 D1 ( parameter-declaration-clause) ... */
8582 if (funcdef_flag && innermost_code != cdk_function)
8584 error ("function definition does not declare parameters");
8585 return error_mark_node;
8588 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8589 && innermost_code != cdk_function
8590 && ! (ctype && !declspecs->any_specifiers_p))
8592 error ("declaration of %qD as non-function", dname);
8593 return error_mark_node;
8597 && TREE_CODE (dname) == IDENTIFIER_NODE
8598 && UDLIT_OPER_P (dname)
8599 && innermost_code != cdk_function)
8601 error ("declaration of %qD as non-function", dname);
8602 return error_mark_node;
8605 if (dname && IDENTIFIER_OPNAME_P (dname))
8607 if (declspecs->specs[(int)ds_typedef])
8609 error ("declaration of %qD as %<typedef%>", dname);
8610 return error_mark_node;
8612 else if (decl_context == PARM || decl_context == CATCHPARM)
8614 error ("declaration of %qD as parameter", dname);
8615 return error_mark_node;
8619 /* Anything declared one level down from the top level
8620 must be one of the parameters of a function
8621 (because the body is at least two levels down). */
8623 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8624 by not allowing C++ class definitions to specify their parameters
8625 with xdecls (must be spec.d in the parmlist).
8627 Since we now wait to push a class scope until we are sure that
8628 we are in a legitimate method context, we must set oldcname
8629 explicitly (since current_class_name is not yet alive).
8631 We also want to avoid calling this a PARM if it is in a namespace. */
8633 if (decl_context == NORMAL && !toplevel_bindings_p ())
8635 cp_binding_level *b = current_binding_level;
8636 current_binding_level = b->level_chain;
8637 if (current_binding_level != 0 && toplevel_bindings_p ())
8638 decl_context = PARM;
8639 current_binding_level = b;
8643 name = decl_context == PARM ? "parameter" : "type name";
8645 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8647 error ("%<constexpr%> cannot appear in a typedef declaration");
8648 return error_mark_node;
8651 /* If there were multiple types specified in the decl-specifier-seq,
8652 issue an error message. */
8653 if (declspecs->multiple_types_p)
8655 error ("two or more data types in declaration of %qs", name);
8656 return error_mark_node;
8659 if (declspecs->conflicting_specifiers_p)
8661 error ("conflicting specifiers in declaration of %qs", name);
8662 return error_mark_node;
8665 /* Extract the basic type from the decl-specifier-seq. */
8666 type = declspecs->type;
8667 if (type == error_mark_node)
8670 type_was_error_mark_node = true;
8672 /* If the entire declaration is itself tagged as deprecated then
8673 suppress reports of deprecated items. */
8674 if (type && TREE_DEPRECATED (type)
8675 && deprecated_state != DEPRECATED_SUPPRESS)
8676 warn_deprecated_use (type, NULL_TREE);
8677 if (type && TREE_CODE (type) == TYPE_DECL)
8679 typedef_decl = type;
8680 type = TREE_TYPE (typedef_decl);
8681 if (TREE_DEPRECATED (type)
8682 && DECL_ARTIFICIAL (typedef_decl)
8683 && deprecated_state != DEPRECATED_SUPPRESS)
8684 warn_deprecated_use (type, NULL_TREE);
8686 /* No type at all: default to `int', and set DEFAULTED_INT
8687 because it was not a user-defined typedef. */
8688 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8690 /* These imply 'int'. */
8691 type = integer_type_node;
8695 explicit_int = declspecs->explicit_int_p;
8696 explicit_char = declspecs->explicit_char_p;
8699 /* See the code below that used this. */
8701 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8703 typedef_type = type;
8706 if (sfk != sfk_conversion)
8707 ctor_return_type = ctype;
8709 if (sfk != sfk_none)
8710 type = check_special_function_return_type (sfk, type,
8712 else if (type == NULL_TREE)
8718 /* We handle `main' specially here, because 'main () { }' is so
8719 common. With no options, it is allowed. With -Wreturn-type,
8720 it is a warning. It is only an error with -pedantic-errors. */
8721 is_main = (funcdef_flag
8722 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8723 && MAIN_NAME_P (dname)
8724 && ctype == NULL_TREE
8725 && in_namespace == NULL_TREE
8726 && current_namespace == global_namespace);
8728 if (type_was_error_mark_node)
8729 /* We've already issued an error, don't complain more. */;
8730 else if (in_system_header || flag_ms_extensions)
8731 /* Allow it, sigh. */;
8733 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8735 pedwarn (input_location, OPT_pedantic,
8736 "ISO C++ forbids declaration of %qs with no type", name);
8738 warning (OPT_Wreturn_type,
8739 "ISO C++ forbids declaration of %qs with no type", name);
8741 type = integer_type_node;
8746 if (explicit_int128)
8748 if (int128_integer_type_node == NULL_TREE)
8750 error ("%<__int128%> is not supported by this target");
8751 explicit_int128 = false;
8753 else if (pedantic && ! in_system_header)
8754 pedwarn (input_location, OPT_pedantic,
8755 "ISO C++ does not support %<__int128%> for %qs", name);
8758 /* Now process the modifiers that were specified
8759 and check for invalid combinations. */
8761 /* Long double is a special combination. */
8762 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8765 type = cp_build_qualified_type (long_double_type_node,
8766 cp_type_quals (type));
8769 /* Check all other uses of type modifiers. */
8771 if (unsigned_p || signed_p || long_p || short_p)
8775 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8776 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8777 else if (signed_p && unsigned_p)
8778 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8779 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8780 error ("%<long long%> invalid for %qs", name);
8781 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8782 error ("%<long%> invalid for %qs", name);
8783 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8784 error ("%<short%> invalid for %qs", name);
8785 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8786 error ("%<long%> or %<short%> invalid for %qs", name);
8787 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8788 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8789 else if ((long_p || short_p) && explicit_char)
8790 error ("%<long%> or %<short%> specified with char for %qs", name);
8791 else if (long_p && short_p)
8792 error ("%<long%> and %<short%> specified together for %qs", name);
8793 else if (type == char16_type_node || type == char32_type_node)
8795 if (signed_p || unsigned_p)
8796 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8797 else if (short_p || long_p)
8798 error ("%<short%> or %<long%> invalid for %qs", name);
8803 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8805 pedwarn (input_location, OPT_pedantic,
8806 "long, short, signed or unsigned used invalidly for %qs",
8808 if (flag_pedantic_errors)
8813 /* Discard the type modifiers if they are invalid. */
8824 /* Decide whether an integer type is signed or not.
8825 Optionally treat bitfields as signed by default. */
8829 It is implementation-defined whether a plain (neither
8830 explicitly signed or unsigned) char, short, int, or long
8831 bit-field is signed or unsigned.
8833 Naturally, we extend this to long long as well. Note that
8834 this does not include wchar_t. */
8835 || (bitfield && !flag_signed_bitfields
8837 /* A typedef for plain `int' without `signed' can be
8838 controlled just like plain `int', but a typedef for
8839 `signed int' cannot be so controlled. */
8841 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8842 && TREE_CODE (type) == INTEGER_TYPE
8843 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8845 if (explicit_int128)
8846 type = int128_unsigned_type_node;
8848 type = long_long_unsigned_type_node;
8850 type = long_unsigned_type_node;
8852 type = short_unsigned_type_node;
8853 else if (type == char_type_node)
8854 type = unsigned_char_type_node;
8855 else if (typedef_decl)
8856 type = unsigned_type_for (type);
8858 type = unsigned_type_node;
8860 else if (signed_p && type == char_type_node)
8861 type = signed_char_type_node;
8862 else if (explicit_int128)
8863 type = int128_integer_type_node;
8865 type = long_long_integer_type_node;
8867 type = long_integer_type_node;
8869 type = short_integer_type_node;
8871 if (declspecs->specs[(int)ds_complex])
8873 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8874 error ("complex invalid for %qs", name);
8875 /* If we just have "complex", it is equivalent to
8876 "complex double", but if any modifiers at all are specified it is
8877 the complex form of TYPE. E.g, "complex short" is
8878 "complex short int". */
8879 else if (defaulted_int && ! longlong && ! explicit_int128
8880 && ! (long_p || short_p || signed_p || unsigned_p))
8881 type = complex_double_type_node;
8882 else if (type == integer_type_node)
8883 type = complex_integer_type_node;
8884 else if (type == float_type_node)
8885 type = complex_float_type_node;
8886 else if (type == double_type_node)
8887 type = complex_double_type_node;
8888 else if (type == long_double_type_node)
8889 type = complex_long_double_type_node;
8891 type = build_complex_type (type);
8894 type_quals = TYPE_UNQUALIFIED;
8895 if (declspecs->specs[(int)ds_const])
8896 type_quals |= TYPE_QUAL_CONST;
8897 if (declspecs->specs[(int)ds_volatile])
8898 type_quals |= TYPE_QUAL_VOLATILE;
8899 if (declspecs->specs[(int)ds_restrict])
8900 type_quals |= TYPE_QUAL_RESTRICT;
8901 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8902 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8905 type_quals |= cp_type_quals (type);
8906 type = cp_build_qualified_type_real
8907 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8908 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8909 /* We might have ignored or rejected some of the qualifiers. */
8910 type_quals = cp_type_quals (type);
8913 inlinep = !! declspecs->specs[(int)ds_inline];
8914 virtualp = !! declspecs->specs[(int)ds_virtual];
8915 explicitp = !! declspecs->specs[(int)ds_explicit];
8917 storage_class = declspecs->storage_class;
8918 if (storage_class == sc_static)
8919 staticp = 1 + (decl_context == FIELD);
8921 if (virtualp && staticp == 2)
8923 error ("member %qD cannot be declared both virtual and static", dname);
8924 storage_class = sc_none;
8927 friendp = !! declspecs->specs[(int)ds_friend];
8929 if (dependent_name && !friendp)
8931 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8932 return error_mark_node;
8935 /* Issue errors about use of storage classes for parameters. */
8936 if (decl_context == PARM)
8938 if (declspecs->specs[(int)ds_typedef])
8940 error ("typedef declaration invalid in parameter declaration");
8941 return error_mark_node;
8943 else if (template_parm_flag && storage_class != sc_none)
8945 error ("storage class specified for template parameter %qs", name);
8946 return error_mark_node;
8948 else if (storage_class == sc_static
8949 || storage_class == sc_extern
8951 error ("storage class specifiers invalid in parameter declarations");
8953 /* Function parameters cannot be constexpr. If we saw one, moan
8954 and pretend it wasn't there. */
8957 error ("a parameter cannot be declared %<constexpr%>");
8962 /* Give error if `virtual' is used outside of class declaration. */
8964 && (current_class_name == NULL_TREE || decl_context != FIELD))
8966 error ("%<virtual%> outside class declaration");
8970 /* Static anonymous unions are dealt with here. */
8971 if (staticp && decl_context == TYPENAME
8973 && ANON_AGGR_TYPE_P (declspecs->type))
8974 decl_context = FIELD;
8976 /* Warn about storage classes that are invalid for certain
8977 kinds of declarations (parameters, typenames, etc.). */
8980 && storage_class != sc_extern
8981 && storage_class != sc_static)
8982 || declspecs->specs[(int)ds_typedef]))
8984 error ("multiple storage classes in declaration of %qs", name);
8987 if (decl_context != NORMAL
8988 && ((storage_class != sc_none
8989 && storage_class != sc_mutable)
8992 if ((decl_context == PARM || decl_context == CATCHPARM)
8993 && (storage_class == sc_register
8994 || storage_class == sc_auto))
8996 else if (declspecs->specs[(int)ds_typedef])
8998 else if (decl_context == FIELD
8999 /* C++ allows static class elements. */
9000 && storage_class == sc_static)
9001 /* C++ also allows inlines and signed and unsigned elements,
9002 but in those cases we don't come in here. */
9006 if (decl_context == FIELD)
9007 error ("storage class specified for %qs", name);
9010 if (decl_context == PARM || decl_context == CATCHPARM)
9011 error ("storage class specified for parameter %qs", name);
9013 error ("storage class specified for typename");
9015 if (storage_class == sc_register
9016 || storage_class == sc_auto
9017 || storage_class == sc_extern
9019 storage_class = sc_none;
9022 else if (storage_class == sc_extern && funcdef_flag
9023 && ! toplevel_bindings_p ())
9024 error ("nested function %qs declared %<extern%>", name);
9025 else if (toplevel_bindings_p ())
9027 if (storage_class == sc_auto)
9028 error ("top-level declaration of %qs specifies %<auto%>", name);
9031 && storage_class != sc_extern
9032 && storage_class != sc_static)
9034 error ("function-scope %qs implicitly auto and declared %<__thread%>",
9039 if (storage_class && friendp)
9041 error ("storage class specifiers invalid in friend function declarations");
9042 storage_class = sc_none;
9047 unqualified_id = NULL_TREE;
9050 unqualified_id = id_declarator->u.id.unqualified_name;
9051 switch (TREE_CODE (unqualified_id))
9054 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9055 if (TYPE_P (unqualified_id))
9056 unqualified_id = constructor_name (unqualified_id);
9059 case IDENTIFIER_NODE:
9060 case TEMPLATE_ID_EXPR:
9068 /* Determine the type of the entity declared by recurring on the
9070 for (; declarator; declarator = declarator->declarator)
9072 const cp_declarator *inner_declarator;
9075 if (type == error_mark_node)
9076 return error_mark_node;
9078 attrs = declarator->attributes;
9084 if (declarator == NULL || declarator->kind == cdk_id)
9085 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9086 if (declarator->kind == cdk_function)
9087 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9088 if (declarator->kind == cdk_array)
9089 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9090 returned_attrs = decl_attributes (&type,
9091 chainon (returned_attrs, attrs),
9095 if (declarator->kind == cdk_id)
9098 inner_declarator = declarator->declarator;
9100 switch (declarator->kind)
9103 type = create_array_type_for_decl (dname, type,
9104 declarator->u.array.bounds);
9112 /* Declaring a function type.
9113 Make sure we have a valid type for the function to return. */
9115 if (type_quals != TYPE_UNQUALIFIED)
9117 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9118 warning (OPT_Wignored_qualifiers,
9119 "type qualifiers ignored on function return type");
9120 /* We now know that the TYPE_QUALS don't apply to the
9121 decl, but to its return type. */
9122 type_quals = TYPE_UNQUALIFIED;
9124 errmsg = targetm.invalid_return_type (type);
9128 type = integer_type_node;
9131 /* Error about some types functions can't return. */
9133 if (TREE_CODE (type) == FUNCTION_TYPE)
9135 error ("%qs declared as function returning a function", name);
9136 return error_mark_node;
9138 if (TREE_CODE (type) == ARRAY_TYPE)
9140 error ("%qs declared as function returning an array", name);
9141 return error_mark_node;
9144 /* Pick up type qualifiers which should be applied to `this'. */
9145 memfn_quals = declarator->u.function.qualifiers;
9146 /* Pick up virt-specifiers. */
9147 virt_specifiers = declarator->u.function.virt_specifiers;
9148 /* Pick up the exception specifications. */
9149 raises = declarator->u.function.exception_specification;
9150 /* If the exception-specification is ill-formed, let's pretend
9151 there wasn't one. */
9152 if (raises == error_mark_node)
9155 /* Say it's a definition only for the CALL_EXPR
9156 closest to the identifier. */
9157 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9159 /* Handle a late-specified return type. */
9162 if (type_uses_auto (type))
9164 if (!declarator->u.function.late_return_type)
9166 error ("%qs function uses %<auto%> type specifier without"
9167 " late return type", name);
9168 return error_mark_node;
9170 else if (!is_auto (type))
9172 error ("%qs function with late return type has"
9173 " %qT as its type rather than plain %<auto%>",
9175 return error_mark_node;
9178 else if (declarator->u.function.late_return_type)
9180 error ("%qs function with late return type not declared"
9181 " with %<auto%> type specifier", name);
9182 return error_mark_node;
9185 type = splice_late_return_type
9186 (type, declarator->u.function.late_return_type);
9187 if (type == error_mark_node)
9188 return error_mark_node;
9190 if (ctype == NULL_TREE
9191 && decl_context == FIELD
9193 && (friendp == 0 || dname == current_class_name))
9194 ctype = current_class_type;
9196 if (ctype && (sfk == sfk_constructor
9197 || sfk == sfk_destructor))
9199 /* We are within a class's scope. If our declarator name
9200 is the same as the class name, and we are defining
9201 a function, then it is a constructor/destructor, and
9202 therefore returns a void type. */
9204 /* ISO C++ 12.4/2. A destructor may not be declared
9205 const or volatile. A destructor may not be
9208 ISO C++ 12.1. A constructor may not be declared
9209 const or volatile. A constructor may not be
9210 virtual. A constructor may not be static. */
9212 error ((flags == DTOR_FLAG)
9213 ? G_("destructor cannot be static member function")
9214 : G_("constructor cannot be static member function"));
9217 error ((flags == DTOR_FLAG)
9218 ? G_("destructors may not be cv-qualified")
9219 : G_("constructors may not be cv-qualified"));
9220 memfn_quals = TYPE_UNQUALIFIED;
9223 if (decl_context == FIELD
9224 && !member_function_or_else (ctype,
9227 return error_mark_node;
9229 if (flags != DTOR_FLAG)
9231 /* It's a constructor. */
9236 permerror (input_location, "constructors cannot be declared virtual");
9239 if (decl_context == FIELD
9240 && sfk != sfk_constructor)
9241 return error_mark_node;
9243 if (decl_context == FIELD)
9249 error ("can%'t initialize friend function %qs", name);
9252 /* Cannot be both friend and virtual. */
9253 error ("virtual functions cannot be friends");
9256 if (decl_context == NORMAL)
9257 error ("friend declaration not in class definition");
9258 if (current_function_decl && funcdef_flag)
9259 error ("can%'t define friend function %qs in a local "
9263 else if (ctype && sfk == sfk_conversion)
9267 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9272 arg_types = grokparms (declarator->u.function.parameters,
9275 if (inner_declarator
9276 && inner_declarator->kind == cdk_id
9277 && inner_declarator->u.id.sfk == sfk_destructor
9278 && arg_types != void_list_node)
9280 error ("destructors may not have parameters");
9281 arg_types = void_list_node;
9285 type = build_function_type (type, arg_types);
9292 /* Filter out pointers-to-references and references-to-references.
9293 We can get these if a TYPE_DECL is used. */
9295 if (TREE_CODE (type) == REFERENCE_TYPE)
9297 if (declarator->kind != cdk_reference)
9299 error ("cannot declare pointer to %q#T", type);
9300 type = TREE_TYPE (type);
9303 /* In C++0x, we allow reference to reference declarations
9304 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9305 and template type arguments [14.3.1/4 temp.arg.type]. The
9306 check for direct reference to reference declarations, which
9307 are still forbidden, occurs below. Reasoning behind the change
9308 can be found in DR106, DR540, and the rvalue reference
9310 else if (cxx_dialect == cxx98)
9312 error ("cannot declare reference to %q#T", type);
9313 type = TREE_TYPE (type);
9316 else if (VOID_TYPE_P (type))
9318 if (declarator->kind == cdk_reference)
9319 error ("cannot declare reference to %q#T", type);
9320 else if (declarator->kind == cdk_ptrmem)
9321 error ("cannot declare pointer to %q#T member", type);
9324 /* We now know that the TYPE_QUALS don't apply to the decl,
9325 but to the target of the pointer. */
9326 type_quals = TYPE_UNQUALIFIED;
9328 if (declarator->kind == cdk_ptrmem
9329 && (TREE_CODE (type) == FUNCTION_TYPE
9330 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9332 memfn_quals |= type_memfn_quals (type);
9333 type = build_memfn_type (type,
9334 declarator->u.pointer.class_type,
9336 if (type == error_mark_node)
9337 return error_mark_node;
9338 memfn_quals = TYPE_UNQUALIFIED;
9341 if (TREE_CODE (type) == FUNCTION_TYPE
9342 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9343 error (declarator->kind == cdk_reference
9344 ? G_("cannot declare reference to qualified function type %qT")
9345 : G_("cannot declare pointer to qualified function type %qT"),
9348 /* When the pointed-to type involves components of variable size,
9349 care must be taken to ensure that the size evaluation code is
9350 emitted early enough to dominate all the possible later uses
9351 and late enough for the variables on which it depends to have
9354 This is expected to happen automatically when the pointed-to
9355 type has a name/declaration of it's own, but special attention
9356 is required if the type is anonymous.
9358 We handle the NORMAL and FIELD contexts here by inserting a
9359 dummy statement that just evaluates the size at a safe point
9360 and ensures it is not deferred until e.g. within a deeper
9361 conditional context (c++/43555).
9363 We expect nothing to be needed here for PARM or TYPENAME.
9364 Evaluating the size at this point for TYPENAME would
9365 actually be incorrect, as we might be in the middle of an
9366 expression with side effects on the pointed-to type size
9367 "arguments" prior to the pointer declaration point and the
9368 size evaluation could end up prior to the side effects. */
9370 if (!TYPE_NAME (type)
9371 && (decl_context == NORMAL || decl_context == FIELD)
9372 && at_function_scope_p ()
9373 && variably_modified_type_p (type, NULL_TREE))
9375 /* First break out any side-effects. */
9376 stabilize_vla_size (TYPE_SIZE (type));
9377 /* And then force evaluation of the SAVE_EXPR. */
9378 finish_expr_stmt (TYPE_SIZE (type));
9381 if (declarator->kind == cdk_reference)
9383 /* In C++0x, the type we are creating a reference to might be
9384 a typedef which is itself a reference type. In that case,
9385 we follow the reference collapsing rules in
9386 [7.1.3/8 dcl.typedef] to create the final reference type:
9388 "If a typedef TD names a type that is a reference to a type
9389 T, an attempt to create the type 'lvalue reference to cv TD'
9390 creates the type 'lvalue reference to T,' while an attempt
9391 to create the type "rvalue reference to cv TD' creates the
9394 if (VOID_TYPE_P (type))
9395 /* We already gave an error. */;
9396 else if (TREE_CODE (type) == REFERENCE_TYPE)
9398 if (declarator->u.reference.rvalue_ref)
9399 /* Leave type alone. */;
9401 type = cp_build_reference_type (TREE_TYPE (type), false);
9404 type = cp_build_reference_type
9405 (type, declarator->u.reference.rvalue_ref);
9407 /* In C++0x, we need this check for direct reference to
9408 reference declarations, which are forbidden by
9409 [8.3.2/5 dcl.ref]. Reference to reference declarations
9410 are only allowed indirectly through typedefs and template
9411 type arguments. Example:
9413 void foo(int & &); // invalid ref-to-ref decl
9415 typedef int & int_ref;
9416 void foo(int_ref &); // valid ref-to-ref decl
9418 if (inner_declarator && inner_declarator->kind == cdk_reference)
9419 error ("cannot declare reference to %q#T, which is not "
9420 "a typedef or a template type argument", type);
9422 else if (TREE_CODE (type) == METHOD_TYPE)
9423 type = build_ptrmemfunc_type (build_pointer_type (type));
9424 else if (declarator->kind == cdk_ptrmem)
9426 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9428 if (declarator->u.pointer.class_type == error_mark_node)
9429 /* We will already have complained. */
9430 type = error_mark_node;
9432 type = build_ptrmem_type (declarator->u.pointer.class_type,
9436 type = build_pointer_type (type);
9438 /* Process a list of type modifier keywords (such as
9439 const or volatile) that were given inside the `*' or `&'. */
9441 if (declarator->u.pointer.qualifiers)
9444 = cp_build_qualified_type (type,
9445 declarator->u.pointer.qualifiers);
9446 type_quals = cp_type_quals (type);
9459 /* We need to stabilize side-effects in VLA sizes for regular array
9460 declarations too, not just pointers to arrays. */
9461 if (type != error_mark_node && !TYPE_NAME (type)
9462 && (decl_context == NORMAL || decl_context == FIELD)
9463 && at_function_scope_p ()
9464 && variably_modified_type_p (type, NULL_TREE))
9465 stabilize_vla_size (TYPE_SIZE (type));
9467 /* A `constexpr' specifier used in an object declaration declares
9468 the object as `const'. */
9469 if (constexpr_p && innermost_code != cdk_function)
9471 if (type_quals & TYPE_QUAL_CONST)
9472 error ("both %<const%> and %<constexpr%> cannot be used here");
9473 if (type_quals & TYPE_QUAL_VOLATILE)
9474 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9475 if (TREE_CODE (type) != REFERENCE_TYPE)
9477 type_quals |= TYPE_QUAL_CONST;
9478 type = cp_build_qualified_type (type, type_quals);
9482 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9483 && TREE_CODE (type) != FUNCTION_TYPE
9484 && TREE_CODE (type) != METHOD_TYPE)
9486 error ("template-id %qD used as a declarator",
9488 unqualified_id = dname;
9491 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9492 qualified with a class-name, turn it into a METHOD_TYPE, unless
9493 we know that the function is static. We take advantage of this
9494 opportunity to do other processing that pertains to entities
9495 explicitly declared to be class members. Note that if DECLARATOR
9496 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9497 would not have exited the loop above. */
9499 && declarator->u.id.qualifying_scope
9500 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9504 ctype = declarator->u.id.qualifying_scope;
9505 ctype = TYPE_MAIN_VARIANT (ctype);
9507 while (t != NULL_TREE && CLASS_TYPE_P (t))
9509 /* You're supposed to have one `template <...>' for every
9510 template class, but you don't need one for a full
9511 specialization. For example:
9513 template <class T> struct S{};
9514 template <> struct S<int> { void f(); };
9515 void S<int>::f () {}
9517 is correct; there shouldn't be a `template <>' for the
9518 definition of `S<int>::f'. */
9519 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9520 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9521 /* T is an explicit (not partial) specialization. All
9522 containing classes must therefore also be explicitly
9525 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9526 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9527 template_count += 1;
9529 t = TYPE_MAIN_DECL (t);
9530 t = DECL_CONTEXT (t);
9533 if (ctype == current_class_type)
9537 permerror (input_location, "member functions are implicitly friends of their class");
9541 permerror (declarator->id_loc,
9542 "extra qualification %<%T::%> on member %qs",
9545 else if (/* If the qualifying type is already complete, then we
9546 can skip the following checks. */
9547 !COMPLETE_TYPE_P (ctype)
9548 && (/* If the function is being defined, then
9549 qualifying type must certainly be complete. */
9551 /* A friend declaration of "T::f" is OK, even if
9552 "T" is a template parameter. But, if this
9553 function is not a friend, the qualifying type
9555 || (!friendp && !CLASS_TYPE_P (ctype))
9556 /* For a declaration, the type need not be
9557 complete, if either it is dependent (since there
9558 is no meaningful definition of complete in that
9559 case) or the qualifying class is currently being
9561 || !(dependent_type_p (ctype)
9562 || currently_open_class (ctype)))
9563 /* Check that the qualifying type is complete. */
9564 && !complete_type_or_else (ctype, NULL_TREE))
9565 return error_mark_node;
9566 else if (TREE_CODE (type) == FUNCTION_TYPE)
9568 if (current_class_type
9569 && (!friendp || funcdef_flag))
9572 ? G_("cannot define member function %<%T::%s%> "
9574 : G_("cannot declare member function %<%T::%s%> "
9576 ctype, name, current_class_type);
9577 return error_mark_node;
9580 else if (declspecs->specs[(int)ds_typedef]
9581 && current_class_type)
9583 error ("cannot declare member %<%T::%s%> within %qT",
9584 ctype, name, current_class_type);
9585 return error_mark_node;
9589 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9590 ctype = current_class_type;
9592 /* Now TYPE has the actual type. */
9597 *attrlist = chainon (returned_attrs, *attrlist);
9599 attrlist = &returned_attrs;
9602 /* Handle parameter packs. */
9603 if (parameter_pack_p)
9605 if (decl_context == PARM)
9606 /* Turn the type into a pack expansion.*/
9607 type = make_pack_expansion (type);
9609 error ("non-parameter %qs cannot be a parameter pack", name);
9612 /* Did array size calculations overflow? */
9614 if (TREE_CODE (type) == ARRAY_TYPE
9615 && COMPLETE_TYPE_P (type)
9616 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9617 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9619 error ("size of array %qs is too large", name);
9620 /* If we proceed with the array type as it is, we'll eventually
9621 crash in tree_low_cst(). */
9622 type = error_mark_node;
9625 if ((decl_context == FIELD || decl_context == PARM)
9626 && !processing_template_decl
9627 && variably_modified_type_p (type, NULL_TREE))
9629 if (decl_context == FIELD)
9630 error ("data member may not have variably modified type %qT", type);
9632 error ("parameter may not have variably modified type %qT", type);
9633 type = error_mark_node;
9636 if (explicitp == 1 || (explicitp && friendp))
9638 /* [dcl.fct.spec] The explicit specifier shall only be used in
9639 declarations of constructors within a class definition. */
9640 error ("only declarations of constructors can be %<explicit%>");
9644 if (storage_class == sc_mutable)
9646 if (decl_context != FIELD || friendp)
9648 error ("non-member %qs cannot be declared %<mutable%>", name);
9649 storage_class = sc_none;
9651 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9653 error ("non-object member %qs cannot be declared %<mutable%>", name);
9654 storage_class = sc_none;
9656 else if (TREE_CODE (type) == FUNCTION_TYPE
9657 || TREE_CODE (type) == METHOD_TYPE)
9659 error ("function %qs cannot be declared %<mutable%>", name);
9660 storage_class = sc_none;
9664 error ("static %qs cannot be declared %<mutable%>", name);
9665 storage_class = sc_none;
9667 else if (type_quals & TYPE_QUAL_CONST)
9669 error ("const %qs cannot be declared %<mutable%>", name);
9670 storage_class = sc_none;
9672 else if (TREE_CODE (type) == REFERENCE_TYPE)
9674 permerror (input_location, "reference %qs cannot be declared "
9675 "%<mutable%>", name);
9676 storage_class = sc_none;
9680 /* If this is declaring a typedef name, return a TYPE_DECL. */
9681 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9685 /* Note that the grammar rejects storage classes
9686 in typenames, fields or parameters. */
9687 if (current_lang_name == lang_name_java)
9688 TYPE_FOR_JAVA (type) = 1;
9690 /* This declaration:
9692 typedef void f(int) const;
9694 declares a function type which is not a member of any
9695 particular class, but which is cv-qualified; for
9696 example "f S::*" declares a pointer to a const-qualified
9697 member function of S. We record the cv-qualification in the
9699 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9701 type = apply_memfn_quals (type, memfn_quals);
9703 /* We have now dealt with these qualifiers. */
9704 memfn_quals = TYPE_UNQUALIFIED;
9707 if (type_uses_auto (type))
9709 error ("typedef declared %<auto%>");
9710 type = error_mark_node;
9713 if (decl_context == FIELD)
9714 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9716 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9717 if (id_declarator && declarator->u.id.qualifying_scope) {
9718 error_at (DECL_SOURCE_LOCATION (decl),
9719 "typedef name may not be a nested-name-specifier");
9720 TREE_TYPE (decl) = error_mark_node;
9723 if (decl_context != FIELD)
9725 if (!current_function_decl)
9726 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9727 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9728 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9729 (current_function_decl)))
9730 /* The TYPE_DECL is "abstract" because there will be
9731 clones of this constructor/destructor, and there will
9732 be copies of this TYPE_DECL generated in those
9734 DECL_ABSTRACT (decl) = 1;
9736 else if (constructor_name_p (unqualified_id, current_class_type))
9737 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9738 "as enclosing class",
9741 /* If the user declares "typedef struct {...} foo" then the
9742 struct will have an anonymous name. Fill that name in now.
9743 Nothing can refer to it, so nothing needs know about the name
9745 if (type != error_mark_node
9748 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9749 && TYPE_ANONYMOUS_P (type)
9750 && declspecs->type_definition_p
9751 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9755 /* Replace the anonymous name with the real name everywhere. */
9756 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9758 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9759 /* We do not rename the debug info representing the
9760 anonymous tagged type because the standard says in
9761 [dcl.typedef] that the naming applies only for
9762 linkage purposes. */
9763 /*debug_hooks->set_name (t, decl);*/
9764 TYPE_NAME (t) = decl;
9767 if (TYPE_LANG_SPECIFIC (type))
9768 TYPE_WAS_ANONYMOUS (type) = 1;
9770 /* If this is a typedef within a template class, the nested
9771 type is a (non-primary) template. The name for the
9772 template needs updating as well. */
9773 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9774 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9775 = TYPE_IDENTIFIER (type);
9777 /* Adjust linkage now that we aren't anonymous anymore. */
9778 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9779 determine_visibility (TYPE_MAIN_DECL (type));
9781 /* FIXME remangle member functions; member functions of a
9782 type with external linkage have external linkage. */
9786 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9787 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9789 bad_specifiers (decl, BSP_TYPE, virtualp,
9790 memfn_quals != TYPE_UNQUALIFIED,
9791 inlinep, friendp, raises != NULL_TREE);
9796 /* Detect the case of an array type of unspecified size
9797 which came, as such, direct from a typedef name.
9798 We must copy the type, so that the array's domain can be
9799 individually set by the object's initializer. */
9801 if (type && typedef_type
9802 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9803 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9804 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9806 /* Detect where we're using a typedef of function type to declare a
9807 function. PARMS will not be set, so we must create it now. */
9809 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9811 tree decls = NULL_TREE;
9814 for (args = TYPE_ARG_TYPES (type);
9815 args && args != void_list_node;
9816 args = TREE_CHAIN (args))
9818 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9820 DECL_CHAIN (decl) = decls;
9824 parms = nreverse (decls);
9826 if (decl_context != TYPENAME)
9828 /* A cv-qualifier-seq shall only be part of the function type
9829 for a non-static member function. [8.3.5/4 dcl.fct] */
9830 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9831 && (current_class_type == NULL_TREE || staticp) )
9834 ? G_("qualified function types cannot be used to "
9835 "declare static member functions")
9836 : G_("qualified function types cannot be used to "
9837 "declare free functions"));
9838 type = TYPE_MAIN_VARIANT (type);
9841 /* The qualifiers on the function type become the qualifiers on
9842 the non-static member function. */
9843 memfn_quals |= type_memfn_quals (type);
9844 type_quals = TYPE_UNQUALIFIED;
9848 /* If this is a type name (such as, in a cast or sizeof),
9849 compute the type and return it now. */
9851 if (decl_context == TYPENAME)
9853 /* Note that the grammar rejects storage classes
9854 in typenames, fields or parameters. */
9855 if (type_quals != TYPE_UNQUALIFIED)
9856 type_quals = TYPE_UNQUALIFIED;
9858 /* Special case: "friend class foo" looks like a TYPENAME context. */
9861 if (type_quals != TYPE_UNQUALIFIED)
9863 error ("type qualifiers specified for friend class declaration");
9864 type_quals = TYPE_UNQUALIFIED;
9868 error ("%<inline%> specified for friend class declaration");
9874 /* Don't allow friend declaration without a class-key. */
9875 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9876 permerror (input_location, "template parameters cannot be friends");
9877 else if (TREE_CODE (type) == TYPENAME_TYPE)
9878 permerror (input_location, "friend declaration requires class-key, "
9879 "i.e. %<friend class %T::%D%>",
9880 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9882 permerror (input_location, "friend declaration requires class-key, "
9883 "i.e. %<friend %#T%>",
9887 /* Only try to do this stuff if we didn't already give up. */
9888 if (type != integer_type_node)
9890 /* A friendly class? */
9891 if (current_class_type)
9892 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9895 error ("trying to make class %qT a friend of global scope",
9898 type = void_type_node;
9901 else if (memfn_quals)
9903 if (ctype == NULL_TREE
9904 && TREE_CODE (type) == METHOD_TYPE)
9905 ctype = TYPE_METHOD_BASETYPE (type);
9908 type = build_memfn_type (type, ctype, memfn_quals);
9909 /* Core issue #547: need to allow this in template type args. */
9910 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9911 type = apply_memfn_quals (type, memfn_quals);
9913 error ("invalid qualifiers on non-member function type");
9918 else if (unqualified_id == NULL_TREE && decl_context != PARM
9919 && decl_context != CATCHPARM
9920 && TREE_CODE (type) != UNION_TYPE
9923 error ("abstract declarator %qT used as declaration", type);
9924 return error_mark_node;
9927 /* Only functions may be declared using an operator-function-id. */
9929 && IDENTIFIER_OPNAME_P (unqualified_id)
9930 && TREE_CODE (type) != FUNCTION_TYPE
9931 && TREE_CODE (type) != METHOD_TYPE)
9933 error ("declaration of %qD as non-function", unqualified_id);
9934 return error_mark_node;
9937 /* We don't check parameter types here because we can emit a better
9938 error message later. */
9939 if (decl_context != PARM)
9941 type = check_var_type (unqualified_id, type);
9942 if (type == error_mark_node)
9943 return error_mark_node;
9946 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9947 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9949 if (decl_context == PARM || decl_context == CATCHPARM)
9951 if (ctype || in_namespace)
9952 error ("cannot use %<::%> in parameter declaration");
9954 if (type_uses_auto (type))
9956 error ("parameter declared %<auto%>");
9957 type = error_mark_node;
9960 /* A parameter declared as an array of T is really a pointer to T.
9961 One declared as a function is really a pointer to a function.
9962 One declared as a member is really a pointer to member. */
9964 if (TREE_CODE (type) == ARRAY_TYPE)
9966 /* Transfer const-ness of array into that of type pointed to. */
9967 type = build_pointer_type (TREE_TYPE (type));
9968 type_quals = TYPE_UNQUALIFIED;
9970 else if (TREE_CODE (type) == FUNCTION_TYPE)
9971 type = build_pointer_type (type);
9974 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9975 && !NEW_DELETE_OPNAME_P (unqualified_id))
9977 cp_cv_quals real_quals = memfn_quals;
9978 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9979 real_quals |= TYPE_QUAL_CONST;
9980 type = build_memfn_type (type, ctype, real_quals);
9986 if (decl_context == PARM)
9988 decl = cp_build_parm_decl (unqualified_id, type);
9990 bad_specifiers (decl, BSP_PARM, virtualp,
9991 memfn_quals != TYPE_UNQUALIFIED,
9992 inlinep, friendp, raises != NULL_TREE);
9994 else if (decl_context == FIELD)
9996 /* The C99 flexible array extension. */
9997 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9998 && TYPE_DOMAIN (type) == NULL_TREE)
10000 tree itype = compute_array_index_type (dname, integer_zero_node,
10001 tf_warning_or_error);
10002 type = build_cplus_array_type (TREE_TYPE (type), itype);
10005 if (type == error_mark_node)
10007 /* Happens when declaring arrays of sizes which
10008 are error_mark_node, for example. */
10011 else if (in_namespace && !friendp)
10013 /* Something like struct S { int N::j; }; */
10014 error ("invalid use of %<::%>");
10015 return error_mark_node;
10017 else if (TREE_CODE (type) == FUNCTION_TYPE
10018 || TREE_CODE (type) == METHOD_TYPE)
10021 tree function_context;
10025 /* This should never happen in pure C++ (the check
10026 could be an assert). It could happen in
10027 Objective-C++ if someone writes invalid code that
10028 uses a function declaration for an instance
10029 variable or property (instance variables and
10030 properties are parsed as FIELD_DECLs, but they are
10031 part of an Objective-C class, not a C++ class).
10032 That code is invalid and is caught by this
10036 error ("declaration of function %qD in invalid context",
10038 return error_mark_node;
10041 /* ``A union may [ ... ] not [ have ] virtual functions.''
10043 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10045 error ("function %qD declared virtual inside a union",
10047 return error_mark_node;
10050 if (NEW_DELETE_OPNAME_P (unqualified_id))
10054 error ("%qD cannot be declared virtual, since it "
10055 "is always static",
10062 /* Check that the name used for a destructor makes sense. */
10063 if (sfk == sfk_destructor)
10065 tree uqname = id_declarator->u.id.unqualified_name;
10069 gcc_assert (friendp);
10070 error ("expected qualified name in friend declaration "
10071 "for destructor %qD", uqname);
10072 return error_mark_node;
10075 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10077 error ("declaration of %qD as member of %qT",
10079 return error_mark_node;
10083 error ("a destructor cannot be %<constexpr%>");
10084 return error_mark_node;
10087 else if (sfk == sfk_constructor && friendp && !ctype)
10089 error ("expected qualified name in friend declaration "
10090 "for constructor %qD",
10091 id_declarator->u.id.unqualified_name);
10092 return error_mark_node;
10095 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10096 function_context = (ctype != NULL_TREE) ?
10097 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10098 publicp = (! friendp || ! staticp)
10099 && function_context == NULL_TREE;
10100 decl = grokfndecl (ctype, type,
10101 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10102 ? unqualified_id : dname,
10105 virtualp, flags, memfn_quals, raises,
10106 friendp ? -1 : 0, friendp, publicp,
10107 inlinep | (2 * constexpr_p),
10109 funcdef_flag, template_count, in_namespace,
10110 attrlist, declarator->id_loc);
10111 decl = set_virt_specifiers (decl, virt_specifiers);
10112 if (decl == NULL_TREE)
10113 return error_mark_node;
10115 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10116 /* The decl and setting of decl_attr is also turned off. */
10117 decl = build_decl_attribute_variant (decl, decl_attr);
10120 /* [class.conv.ctor]
10122 A constructor declared without the function-specifier
10123 explicit that can be called with a single parameter
10124 specifies a conversion from the type of its first
10125 parameter to the type of its class. Such a constructor
10126 is called a converting constructor. */
10127 if (explicitp == 2)
10128 DECL_NONCONVERTING_P (decl) = 1;
10130 else if (!staticp && !dependent_type_p (type)
10131 && !COMPLETE_TYPE_P (complete_type (type))
10132 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10134 if (unqualified_id)
10135 error ("field %qD has incomplete type", unqualified_id);
10137 error ("name %qT has incomplete type", type);
10139 /* If we're instantiating a template, tell them which
10140 instantiation made the field's type be incomplete. */
10141 if (current_class_type
10142 && TYPE_NAME (current_class_type)
10143 && IDENTIFIER_TEMPLATE (current_class_name)
10145 && declspecs->type == type)
10146 error (" in instantiation of template %qT",
10147 current_class_type);
10149 return error_mark_node;
10155 error ("%qE is neither function nor member function; "
10156 "cannot be declared friend", unqualified_id);
10164 /* Friends are treated specially. */
10165 if (ctype == current_class_type)
10166 ; /* We already issued a permerror. */
10167 else if (decl && DECL_NAME (decl))
10169 if (template_class_depth (current_class_type) == 0)
10171 decl = check_explicit_specialization
10172 (unqualified_id, decl, template_count,
10173 2 * funcdef_flag + 4);
10174 if (decl == error_mark_node)
10175 return error_mark_node;
10178 decl = do_friend (ctype, unqualified_id, decl,
10184 return error_mark_node;
10187 /* Structure field. It may not be a function, except for C++. */
10189 if (decl == NULL_TREE)
10193 /* C++ allows static class members. All other work
10194 for this is done by grokfield. */
10195 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10196 set_linkage_for_static_data_member (decl);
10197 /* Even if there is an in-class initialization, DECL
10198 is considered undefined until an out-of-class
10199 definition is provided. */
10200 DECL_EXTERNAL (decl) = 1;
10203 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10205 if (constexpr_p && !initialized)
10207 error ("constexpr static data member %qD must have an "
10208 "initializer", decl);
10209 constexpr_p = false;
10216 error ("non-static data member %qE declared %<constexpr%>",
10218 constexpr_p = false;
10220 decl = build_decl (input_location,
10221 FIELD_DECL, unqualified_id, type);
10222 DECL_NONADDRESSABLE_P (decl) = bitfield;
10223 if (bitfield && !unqualified_id)
10224 TREE_NO_WARNING (decl) = 1;
10226 if (storage_class == sc_mutable)
10228 DECL_MUTABLE_P (decl) = 1;
10229 storage_class = sc_none;
10233 /* An attempt is being made to initialize a non-static
10234 member. This is new in C++11. */
10235 maybe_warn_cpp0x (CPP0X_NSDMI);
10238 bad_specifiers (decl, BSP_FIELD, virtualp,
10239 memfn_quals != TYPE_UNQUALIFIED,
10240 inlinep, friendp, raises != NULL_TREE);
10243 else if (TREE_CODE (type) == FUNCTION_TYPE
10244 || TREE_CODE (type) == METHOD_TYPE)
10246 tree original_name;
10249 if (!unqualified_id)
10250 return error_mark_node;
10252 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10253 original_name = dname;
10255 original_name = unqualified_id;
10257 if (storage_class == sc_auto)
10258 error ("storage class %<auto%> invalid for function %qs", name);
10259 else if (storage_class == sc_register)
10260 error ("storage class %<register%> invalid for function %qs", name);
10262 error ("storage class %<__thread%> invalid for function %qs", name);
10264 if (virt_specifiers)
10265 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10266 /* Function declaration not at top level.
10267 Storage classes other than `extern' are not allowed
10268 and `extern' makes no difference. */
10269 if (! toplevel_bindings_p ()
10270 && (storage_class == sc_static
10271 || declspecs->specs[(int)ds_inline])
10274 if (storage_class == sc_static)
10275 pedwarn (input_location, OPT_pedantic,
10276 "%<static%> specified invalid for function %qs "
10277 "declared out of global scope", name);
10279 pedwarn (input_location, OPT_pedantic,
10280 "%<inline%> specifier invalid for function %qs "
10281 "declared out of global scope", name);
10284 if (ctype == NULL_TREE)
10288 error ("virtual non-class function %qs", name);
10291 else if (sfk == sfk_constructor
10292 || sfk == sfk_destructor)
10294 error (funcdef_flag
10295 ? G_("%qs defined in a non-class scope")
10296 : G_("%qs declared in a non-class scope"), name);
10301 /* Record presence of `static'. */
10302 publicp = (ctype != NULL_TREE
10303 || storage_class == sc_extern
10304 || storage_class != sc_static);
10306 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10307 virtualp, flags, memfn_quals, raises,
10309 publicp, inlinep | (2 * constexpr_p), sfk,
10311 template_count, in_namespace, attrlist,
10312 declarator->id_loc);
10313 if (decl == NULL_TREE)
10314 return error_mark_node;
10318 int invalid_static = 0;
10320 /* Don't allow a static member function in a class, and forbid
10321 declaring main to be static. */
10322 if (TREE_CODE (type) == METHOD_TYPE)
10324 permerror (input_location, "cannot declare member function %qD to have "
10325 "static linkage", decl);
10326 invalid_static = 1;
10328 else if (current_function_decl)
10330 /* FIXME need arm citation */
10331 error ("cannot declare static function inside another function");
10332 invalid_static = 1;
10335 if (invalid_static)
10338 storage_class = sc_none;
10344 /* It's a variable. */
10346 /* An uninitialized decl with `extern' is a reference. */
10347 decl = grokvardecl (type, unqualified_id,
10350 (type_quals & TYPE_QUAL_CONST) != 0,
10351 ctype ? ctype : in_namespace);
10352 bad_specifiers (decl, BSP_VAR, virtualp,
10353 memfn_quals != TYPE_UNQUALIFIED,
10354 inlinep, friendp, raises != NULL_TREE);
10358 DECL_CONTEXT (decl) = ctype;
10361 permerror (input_location, "%<static%> may not be used when defining "
10362 "(as opposed to declaring) a static data member");
10364 storage_class = sc_none;
10366 if (storage_class == sc_register && TREE_STATIC (decl))
10368 error ("static member %qD declared %<register%>", decl);
10369 storage_class = sc_none;
10371 if (storage_class == sc_extern && pedantic)
10373 pedwarn (input_location, OPT_pedantic,
10374 "cannot explicitly declare member %q#D to have "
10375 "extern linkage", decl);
10376 storage_class = sc_none;
10379 else if (constexpr_p && DECL_EXTERNAL (decl))
10381 error ("declaration of constexpr variable %qD is not a definition",
10383 constexpr_p = false;
10387 if (storage_class == sc_extern && initialized && !funcdef_flag)
10389 if (toplevel_bindings_p ())
10391 /* It's common practice (and completely valid) to have a const
10392 be initialized and declared extern. */
10393 if (!(type_quals & TYPE_QUAL_CONST))
10394 warning (0, "%qs initialized and declared %<extern%>", name);
10398 error ("%qs has both %<extern%> and initializer", name);
10399 return error_mark_node;
10403 /* Record `register' declaration for warnings on &
10404 and in case doing stupid register allocation. */
10406 if (storage_class == sc_register)
10407 DECL_REGISTER (decl) = 1;
10408 else if (storage_class == sc_extern)
10409 DECL_THIS_EXTERN (decl) = 1;
10410 else if (storage_class == sc_static)
10411 DECL_THIS_STATIC (decl) = 1;
10413 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10414 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10415 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10417 /* Record constancy and volatility on the DECL itself . There's
10418 no need to do this when processing a template; we'll do this
10419 for the instantiated declaration based on the type of DECL. */
10420 if (!processing_template_decl)
10421 cp_apply_type_quals_to_decl (type_quals, decl);
10427 /* Subroutine of start_function. Ensure that each of the parameter
10428 types (as listed in PARMS) is complete, as is required for a
10429 function definition. */
10432 require_complete_types_for_parms (tree parms)
10434 for (; parms; parms = DECL_CHAIN (parms))
10436 if (dependent_type_p (TREE_TYPE (parms)))
10438 if (!VOID_TYPE_P (TREE_TYPE (parms))
10439 && complete_type_or_else (TREE_TYPE (parms), parms))
10441 relayout_decl (parms);
10442 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10445 /* grokparms or complete_type_or_else will have already issued
10447 TREE_TYPE (parms) = error_mark_node;
10451 /* Returns nonzero if T is a local variable. */
10454 local_variable_p (const_tree t)
10456 if ((TREE_CODE (t) == VAR_DECL
10457 /* A VAR_DECL with a context that is a _TYPE is a static data
10459 && !TYPE_P (CP_DECL_CONTEXT (t))
10460 /* Any other non-local variable must be at namespace scope. */
10461 && !DECL_NAMESPACE_SCOPE_P (t))
10462 || (TREE_CODE (t) == PARM_DECL))
10468 /* Like local_variable_p, but suitable for use as a tree-walking
10472 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10473 void *data ATTRIBUTE_UNUSED)
10475 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10477 else if (TYPE_P (*tp))
10478 *walk_subtrees = 0;
10484 /* Check that ARG, which is a default-argument expression for a
10485 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10486 something goes wrong. DECL may also be a _TYPE node, rather than a
10487 DECL, if there is no DECL available. */
10490 check_default_argument (tree decl, tree arg)
10495 if (TREE_CODE (arg) == DEFAULT_ARG)
10496 /* We get a DEFAULT_ARG when looking at an in-class declaration
10497 with a default argument. Ignore the argument for now; we'll
10498 deal with it after the class is complete. */
10507 decl_type = TREE_TYPE (decl);
10509 if (arg == error_mark_node
10510 || decl == error_mark_node
10511 || TREE_TYPE (arg) == error_mark_node
10512 || decl_type == error_mark_node)
10513 /* Something already went wrong. There's no need to check
10515 return error_mark_node;
10517 /* [dcl.fct.default]
10519 A default argument expression is implicitly converted to the
10521 if (!TREE_TYPE (arg)
10522 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10525 error ("default argument for %q#D has type %qT",
10526 decl, TREE_TYPE (arg));
10528 error ("default argument for parameter of type %qT has type %qT",
10529 decl_type, TREE_TYPE (arg));
10531 return error_mark_node;
10534 /* [dcl.fct.default]
10536 Local variables shall not be used in default argument
10539 The keyword `this' shall not be used in a default argument of a
10540 member function. */
10541 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10544 error ("default argument %qE uses local variable %qD", arg, var);
10545 return error_mark_node;
10552 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10555 type_is_deprecated (tree type)
10557 enum tree_code code;
10558 if (TREE_DEPRECATED (type))
10560 if (TYPE_NAME (type)
10561 && TREE_DEPRECATED (TYPE_NAME (type)))
10564 /* Do warn about using typedefs to a deprecated class. */
10565 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10566 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10568 code = TREE_CODE (type);
10570 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10571 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10572 || code == METHOD_TYPE || code == ARRAY_TYPE)
10573 return type_is_deprecated (TREE_TYPE (type));
10575 if (TYPE_PTRMEMFUNC_P (type))
10576 return type_is_deprecated
10577 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10582 /* Decode the list of parameter types for a function type.
10583 Given the list of things declared inside the parens,
10584 return a list of types.
10586 If this parameter does not end with an ellipsis, we append
10589 *PARMS is set to the chain of PARM_DECLs created. */
10592 grokparms (tree parmlist, tree *parms)
10594 tree result = NULL_TREE;
10595 tree decls = NULL_TREE;
10599 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10601 tree type = NULL_TREE;
10602 tree init = TREE_PURPOSE (parm);
10603 tree decl = TREE_VALUE (parm);
10604 const char *errmsg;
10606 if (parm == void_list_node)
10609 if (! decl || TREE_TYPE (decl) == error_mark_node)
10612 type = TREE_TYPE (decl);
10613 if (VOID_TYPE_P (type))
10615 if (same_type_p (type, void_type_node)
10616 && DECL_SELF_REFERENCE_P (type)
10617 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10618 /* this is a parmlist of `(void)', which is ok. */
10620 cxx_incomplete_type_error (decl, type);
10621 /* It's not a good idea to actually create parameters of
10622 type `void'; other parts of the compiler assume that a
10623 void type terminates the parameter list. */
10624 type = error_mark_node;
10625 TREE_TYPE (decl) = error_mark_node;
10628 if (type != error_mark_node
10629 && TYPE_FOR_JAVA (type)
10630 && MAYBE_CLASS_TYPE_P (type))
10632 error ("parameter %qD has Java class type", decl);
10633 type = error_mark_node;
10634 TREE_TYPE (decl) = error_mark_node;
10638 if (type != error_mark_node
10639 && (errmsg = targetm.invalid_parameter_type (type)))
10642 type = error_mark_node;
10643 TREE_TYPE (decl) = error_mark_node;
10646 if (type != error_mark_node)
10648 if (deprecated_state != DEPRECATED_SUPPRESS)
10650 tree deptype = type_is_deprecated (type);
10652 warn_deprecated_use (deptype, NULL_TREE);
10655 /* Top-level qualifiers on the parameters are
10656 ignored for function types. */
10657 type = cp_build_qualified_type (type, 0);
10658 if (TREE_CODE (type) == METHOD_TYPE)
10660 error ("parameter %qD invalidly declared method type", decl);
10661 type = build_pointer_type (type);
10662 TREE_TYPE (decl) = type;
10664 else if (abstract_virtuals_error (decl, type))
10665 any_error = 1; /* Seems like a good idea. */
10666 else if (POINTER_TYPE_P (type))
10668 /* [dcl.fct]/6, parameter types cannot contain pointers
10669 (references) to arrays of unknown bound. */
10670 tree t = TREE_TYPE (type);
10671 int ptr = TYPE_PTR_P (type);
10675 if (TYPE_PTR_P (t))
10677 else if (TREE_CODE (t) != ARRAY_TYPE)
10679 else if (!TYPE_DOMAIN (t))
10683 if (TREE_CODE (t) == ARRAY_TYPE)
10685 ? G_("parameter %qD includes pointer to array of "
10686 "unknown bound %qT")
10687 : G_("parameter %qD includes reference to array of "
10688 "unknown bound %qT"),
10694 else if (init && !processing_template_decl)
10695 init = check_default_argument (decl, init);
10698 DECL_CHAIN (decl) = decls;
10700 result = tree_cons (init, type, result);
10702 decls = nreverse (decls);
10703 result = nreverse (result);
10705 result = chainon (result, void_list_node);
10712 /* D is a constructor or overloaded `operator='.
10714 Let T be the class in which D is declared. Then, this function
10717 -1 if D's is an ill-formed constructor or copy assignment operator
10718 whose first parameter is of type `T'.
10719 0 if D is not a copy constructor or copy assignment
10721 1 if D is a copy constructor or copy assignment operator whose
10722 first parameter is a reference to non-const qualified T.
10723 2 if D is a copy constructor or copy assignment operator whose
10724 first parameter is a reference to const qualified T.
10726 This function can be used as a predicate. Positive values indicate
10727 a copy constructor and nonzero values indicate a copy assignment
10731 copy_fn_p (const_tree d)
10737 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10739 if (TREE_CODE (d) == TEMPLATE_DECL
10740 || (DECL_TEMPLATE_INFO (d)
10741 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10742 /* Instantiations of template member functions are never copy
10743 functions. Note that member functions of templated classes are
10744 represented as template functions internally, and we must
10745 accept those as copy functions. */
10748 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10752 arg_type = TREE_VALUE (args);
10753 if (arg_type == error_mark_node)
10756 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10758 /* Pass by value copy assignment operator. */
10761 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10762 && !TYPE_REF_IS_RVALUE (arg_type)
10763 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10765 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10771 args = TREE_CHAIN (args);
10773 if (args && args != void_list_node && !TREE_PURPOSE (args))
10774 /* There are more non-optional args. */
10780 /* D is a constructor or overloaded `operator='.
10782 Let T be the class in which D is declared. Then, this function
10783 returns true when D is a move constructor or move assignment
10784 operator, false otherwise. */
10787 move_fn_p (const_tree d)
10791 bool result = false;
10793 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10795 if (cxx_dialect == cxx98)
10796 /* There are no move constructors if we are in C++98 mode. */
10799 if (TREE_CODE (d) == TEMPLATE_DECL
10800 || (DECL_TEMPLATE_INFO (d)
10801 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10802 /* Instantiations of template member functions are never copy
10803 functions. Note that member functions of templated classes are
10804 represented as template functions internally, and we must
10805 accept those as copy functions. */
10808 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10812 arg_type = TREE_VALUE (args);
10813 if (arg_type == error_mark_node)
10816 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10817 && TYPE_REF_IS_RVALUE (arg_type)
10818 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10822 args = TREE_CHAIN (args);
10824 if (args && args != void_list_node && !TREE_PURPOSE (args))
10825 /* There are more non-optional args. */
10831 /* Remember any special properties of member function DECL. */
10834 grok_special_member_properties (tree decl)
10838 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10841 class_type = DECL_CONTEXT (decl);
10842 if (DECL_CONSTRUCTOR_P (decl))
10844 int ctor = copy_fn_p (decl);
10846 if (!DECL_ARTIFICIAL (decl))
10847 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10853 A non-template constructor for class X is a copy
10854 constructor if its first parameter is of type X&, const
10855 X&, volatile X& or const volatile X&, and either there
10856 are no other parameters or else all other parameters have
10857 default arguments. */
10858 TYPE_HAS_COPY_CTOR (class_type) = 1;
10859 if (user_provided_p (decl))
10860 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10862 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10864 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10866 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10867 if (user_provided_p (decl))
10868 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10870 else if (move_fn_p (decl) && user_provided_p (decl))
10871 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10872 else if (is_list_ctor (decl))
10873 TYPE_HAS_LIST_CTOR (class_type) = 1;
10875 if (DECL_DECLARED_CONSTEXPR_P (decl)
10876 && !copy_fn_p (decl) && !move_fn_p (decl))
10877 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10879 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10883 A non-template assignment operator for class X is a copy
10884 assignment operator if its parameter is of type X, X&, const
10885 X&, volatile X& or const volatile X&. */
10887 int assop = copy_fn_p (decl);
10891 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10892 if (user_provided_p (decl))
10893 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10895 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10897 else if (move_fn_p (decl) && user_provided_p (decl))
10898 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10900 /* Destructors are handled in check_methods. */
10903 /* Check a constructor DECL has the correct form. Complains
10904 if the class has a constructor of the form X(X). */
10907 grok_ctor_properties (const_tree ctype, const_tree decl)
10909 int ctor_parm = copy_fn_p (decl);
10915 A declaration of a constructor for a class X is ill-formed if
10916 its first parameter is of type (optionally cv-qualified) X
10917 and either there are no other parameters or else all other
10918 parameters have default arguments.
10920 We *don't* complain about member template instantiations that
10921 have this form, though; they can occur as we try to decide
10922 what constructor to use during overload resolution. Since
10923 overload resolution will never prefer such a constructor to
10924 the non-template copy constructor (which is either explicitly
10925 or implicitly defined), there's no need to worry about their
10926 existence. Theoretically, they should never even be
10927 instantiated, but that's hard to forestall. */
10928 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10936 /* An operator with this code is unary, but can also be binary. */
10939 ambi_op_p (enum tree_code code)
10941 return (code == INDIRECT_REF
10942 || code == ADDR_EXPR
10943 || code == UNARY_PLUS_EXPR
10944 || code == NEGATE_EXPR
10945 || code == PREINCREMENT_EXPR
10946 || code == PREDECREMENT_EXPR);
10949 /* An operator with this name can only be unary. */
10952 unary_op_p (enum tree_code code)
10954 return (code == TRUTH_NOT_EXPR
10955 || code == BIT_NOT_EXPR
10956 || code == COMPONENT_REF
10957 || code == TYPE_EXPR);
10960 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10961 errors are issued for invalid declarations. */
10964 grok_op_properties (tree decl, bool complain)
10966 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10968 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10969 tree name = DECL_NAME (decl);
10970 enum tree_code operator_code;
10975 /* Count the number of arguments and check for ellipsis. */
10976 for (argtype = argtypes, arity = 0;
10977 argtype && argtype != void_list_node;
10978 argtype = TREE_CHAIN (argtype))
10980 ellipsis_p = !argtype;
10982 class_type = DECL_CONTEXT (decl);
10983 if (class_type && !CLASS_TYPE_P (class_type))
10984 class_type = NULL_TREE;
10986 if (DECL_CONV_FN_P (decl))
10987 operator_code = TYPE_EXPR;
10991 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10992 if (ansi_opname (CODE) == name) \
10994 operator_code = (CODE); \
10997 else if (ansi_assopname (CODE) == name) \
10999 operator_code = (CODE); \
11000 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11004 #include "operators.def"
11005 #undef DEF_OPERATOR
11007 gcc_unreachable ();
11010 gcc_assert (operator_code != MAX_TREE_CODES);
11011 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11014 switch (operator_code)
11017 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11021 TYPE_GETS_DELETE (class_type) |= 1;
11025 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11028 case VEC_DELETE_EXPR:
11029 TYPE_GETS_DELETE (class_type) |= 2;
11036 /* [basic.std.dynamic.allocation]/1:
11038 A program is ill-formed if an allocation function is declared
11039 in a namespace scope other than global scope or declared static
11042 The same also holds true for deallocation functions. */
11043 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11044 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11046 if (DECL_NAMESPACE_SCOPE_P (decl))
11048 if (CP_DECL_CONTEXT (decl) != global_namespace)
11050 error ("%qD may not be declared within a namespace", decl);
11053 else if (!TREE_PUBLIC (decl))
11055 error ("%qD may not be declared as static", decl);
11061 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11063 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11064 DECL_IS_OPERATOR_NEW (decl) = 1;
11066 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11067 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11070 /* An operator function must either be a non-static member function
11071 or have at least one parameter of a class, a reference to a class,
11072 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11073 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11075 if (operator_code == TYPE_EXPR
11076 || operator_code == CALL_EXPR
11077 || operator_code == COMPONENT_REF
11078 || operator_code == ARRAY_REF
11079 || operator_code == NOP_EXPR)
11081 error ("%qD must be a nonstatic member function", decl);
11088 if (DECL_STATIC_FUNCTION_P (decl))
11090 error ("%qD must be either a non-static member "
11091 "function or a non-member function", decl);
11095 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11097 tree arg = non_reference (TREE_VALUE (p));
11098 if (arg == error_mark_node)
11101 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11102 because these checks are performed even on
11103 template functions. */
11104 if (MAYBE_CLASS_TYPE_P (arg)
11105 || TREE_CODE (arg) == ENUMERAL_TYPE)
11109 if (!p || p == void_list_node)
11112 error ("%qD must have an argument of class or "
11113 "enumerated type", decl);
11119 /* There are no restrictions on the arguments to an overloaded
11121 if (operator_code == CALL_EXPR)
11124 /* Warn about conversion operators that will never be used. */
11125 if (IDENTIFIER_TYPENAME_P (name)
11126 && ! DECL_TEMPLATE_INFO (decl)
11128 /* Warn only declaring the function; there is no need to
11129 warn again about out-of-class definitions. */
11130 && class_type == current_class_type)
11132 tree t = TREE_TYPE (name);
11133 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11136 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11138 if (TREE_CODE (t) == VOID_TYPE)
11139 warning (OPT_Wconversion,
11141 ? G_("conversion to a reference to void "
11142 "will never use a type conversion operator")
11143 : G_("conversion to void "
11144 "will never use a type conversion operator"));
11145 else if (class_type)
11147 if (t == class_type)
11148 warning (OPT_Wconversion,
11150 ? G_("conversion to a reference to the same type "
11151 "will never use a type conversion operator")
11152 : G_("conversion to the same type "
11153 "will never use a type conversion operator"));
11154 /* Don't force t to be complete here. */
11155 else if (MAYBE_CLASS_TYPE_P (t)
11156 && COMPLETE_TYPE_P (t)
11157 && DERIVED_FROM_P (t, class_type))
11158 warning (OPT_Wconversion,
11160 ? G_("conversion to a reference to a base class "
11161 "will never use a type conversion operator")
11162 : G_("conversion to a base class "
11163 "will never use a type conversion operator"));
11168 if (operator_code == COND_EXPR)
11171 error ("ISO C++ prohibits overloading operator ?:");
11174 else if (ellipsis_p)
11176 error ("%qD must not have variable number of arguments", decl);
11179 else if (ambi_op_p (operator_code))
11182 /* We pick the one-argument operator codes by default, so
11183 we don't have to change anything. */
11185 else if (arity == 2)
11187 /* If we thought this was a unary operator, we now know
11188 it to be a binary operator. */
11189 switch (operator_code)
11192 operator_code = MULT_EXPR;
11196 operator_code = BIT_AND_EXPR;
11199 case UNARY_PLUS_EXPR:
11200 operator_code = PLUS_EXPR;
11204 operator_code = MINUS_EXPR;
11207 case PREINCREMENT_EXPR:
11208 operator_code = POSTINCREMENT_EXPR;
11211 case PREDECREMENT_EXPR:
11212 operator_code = POSTDECREMENT_EXPR;
11216 gcc_unreachable ();
11219 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11221 if ((operator_code == POSTINCREMENT_EXPR
11222 || operator_code == POSTDECREMENT_EXPR)
11223 && ! processing_template_decl
11224 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11227 error ("postfix %qD must take %<int%> as its argument",
11230 error ("postfix %qD must take %<int%> as its second "
11238 error ("%qD must take either zero or one argument", decl);
11240 error ("%qD must take either one or two arguments", decl);
11244 /* More Effective C++ rule 6. */
11246 && (operator_code == POSTINCREMENT_EXPR
11247 || operator_code == POSTDECREMENT_EXPR
11248 || operator_code == PREINCREMENT_EXPR
11249 || operator_code == PREDECREMENT_EXPR))
11251 tree arg = TREE_VALUE (argtypes);
11252 tree ret = TREE_TYPE (TREE_TYPE (decl));
11253 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11254 arg = TREE_TYPE (arg);
11255 arg = TYPE_MAIN_VARIANT (arg);
11256 if (operator_code == PREINCREMENT_EXPR
11257 || operator_code == PREDECREMENT_EXPR)
11259 if (TREE_CODE (ret) != REFERENCE_TYPE
11260 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11262 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11263 build_reference_type (arg));
11267 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11268 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11272 else if (unary_op_p (operator_code))
11277 error ("%qD must take %<void%>", decl);
11279 error ("%qD must take exactly one argument", decl);
11283 else /* if (binary_op_p (operator_code)) */
11288 error ("%qD must take exactly one argument", decl);
11290 error ("%qD must take exactly two arguments", decl);
11294 /* More Effective C++ rule 7. */
11296 && (operator_code == TRUTH_ANDIF_EXPR
11297 || operator_code == TRUTH_ORIF_EXPR
11298 || operator_code == COMPOUND_EXPR))
11299 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11303 /* Effective C++ rule 23. */
11306 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11307 && (operator_code == PLUS_EXPR
11308 || operator_code == MINUS_EXPR
11309 || operator_code == TRUNC_DIV_EXPR
11310 || operator_code == MULT_EXPR
11311 || operator_code == TRUNC_MOD_EXPR)
11312 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11313 warning (OPT_Weffc__, "%qD should return by value", decl);
11315 /* [over.oper]/8 */
11316 for (; argtypes && argtypes != void_list_node;
11317 argtypes = TREE_CHAIN (argtypes))
11318 if (TREE_PURPOSE (argtypes))
11320 TREE_PURPOSE (argtypes) = NULL_TREE;
11321 if (operator_code == POSTINCREMENT_EXPR
11322 || operator_code == POSTDECREMENT_EXPR)
11324 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11329 error ("%qD cannot have default arguments", decl);
11337 /* Return a string giving the keyword associate with CODE. */
11339 static const char *
11340 tag_name (enum tag_types code)
11352 case typename_type:
11355 gcc_unreachable ();
11359 /* Name lookup in an elaborated-type-specifier (after the keyword
11360 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11361 elaborated-type-specifier is invalid, issue a diagnostic and return
11362 error_mark_node; otherwise, return the *_TYPE to which it referred.
11363 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11366 check_elaborated_type_specifier (enum tag_types tag_code,
11368 bool allow_template_p)
11374 struct S { struct S *p; };
11376 name lookup will find the TYPE_DECL for the implicit "S::S"
11377 typedef. Adjust for that here. */
11378 if (DECL_SELF_REFERENCE_P (decl))
11379 decl = TYPE_NAME (TREE_TYPE (decl));
11381 type = TREE_TYPE (decl);
11383 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11384 is false for this case as well. */
11385 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11387 error ("using template type parameter %qT after %qs",
11388 type, tag_name (tag_code));
11389 return error_mark_node;
11393 If the identifier resolves to a typedef-name or a template
11394 type-parameter, the elaborated-type-specifier is ill-formed.
11396 In other words, the only legitimate declaration to use in the
11397 elaborated type specifier is the implicit typedef created when
11398 the type is declared. */
11399 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11400 && !DECL_SELF_REFERENCE_P (decl)
11401 && tag_code != typename_type)
11403 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11404 error ("%q+D has a previous declaration here", decl);
11405 return error_mark_node;
11407 else if (TREE_CODE (type) != RECORD_TYPE
11408 && TREE_CODE (type) != UNION_TYPE
11409 && tag_code != enum_type
11410 && tag_code != typename_type)
11412 error ("%qT referred to as %qs", type, tag_name (tag_code));
11413 error ("%q+T has a previous declaration here", type);
11414 return error_mark_node;
11416 else if (TREE_CODE (type) != ENUMERAL_TYPE
11417 && tag_code == enum_type)
11419 error ("%qT referred to as enum", type);
11420 error ("%q+T has a previous declaration here", type);
11421 return error_mark_node;
11423 else if (!allow_template_p
11424 && TREE_CODE (type) == RECORD_TYPE
11425 && CLASSTYPE_IS_TEMPLATE (type))
11427 /* If a class template appears as elaborated type specifier
11428 without a template header such as:
11430 template <class T> class C {};
11431 void f(class C); // No template header here
11433 then the required template argument is missing. */
11434 error ("template argument required for %<%s %T%>",
11435 tag_name (tag_code),
11436 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11437 return error_mark_node;
11443 /* Lookup NAME in elaborate type specifier in scope according to
11444 SCOPE and issue diagnostics if necessary.
11445 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11446 found, and ERROR_MARK_NODE for type error. */
11449 lookup_and_check_tag (enum tag_types tag_code, tree name,
11450 tag_scope scope, bool template_header_p)
11454 if (scope == ts_global)
11456 /* First try ordinary name lookup, ignoring hidden class name
11457 injected via friend declaration. */
11458 decl = lookup_name_prefer_type (name, 2);
11459 /* If that fails, the name will be placed in the smallest
11460 non-class, non-function-prototype scope according to 3.3.1/5.
11461 We may already have a hidden name declared as friend in this
11462 scope. So lookup again but not ignoring hidden names.
11463 If we find one, that name will be made visible rather than
11464 creating a new tag. */
11466 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11469 decl = lookup_type_scope (name, scope);
11471 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11472 decl = DECL_TEMPLATE_RESULT (decl);
11474 if (decl && TREE_CODE (decl) == TYPE_DECL)
11476 /* Look for invalid nested type:
11480 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11482 error ("%qD has the same name as the class in which it is "
11485 return error_mark_node;
11488 /* Two cases we need to consider when deciding if a class
11489 template is allowed as an elaborated type specifier:
11490 1. It is a self reference to its own class.
11491 2. It comes with a template header.
11495 template <class T> class C {
11496 class C *c1; // DECL_SELF_REFERENCE_P is true
11499 template <class U> class C; // template_header_p is true
11500 template <class T> class C<T>::D {
11501 class C *c2; // DECL_SELF_REFERENCE_P is true
11504 t = check_elaborated_type_specifier (tag_code,
11507 | DECL_SELF_REFERENCE_P (decl));
11510 else if (decl && TREE_CODE (decl) == TREE_LIST)
11512 error ("reference to %qD is ambiguous", name);
11513 print_candidates (decl);
11514 return error_mark_node;
11520 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11521 Define the tag as a forward-reference if it is not defined.
11523 If a declaration is given, process it here, and report an error if
11524 multiple declarations are not identical.
11526 SCOPE is TS_CURRENT when this is also a definition. Only look in
11527 the current frame for the name (since C++ allows new names in any
11528 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11529 declaration. Only look beginning from the current scope outward up
11530 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11532 TEMPLATE_HEADER_P is true when this declaration is preceded by
11533 a set of template parameters. */
11536 xref_tag_1 (enum tag_types tag_code, tree name,
11537 tag_scope scope, bool template_header_p)
11539 enum tree_code code;
11541 tree context = NULL_TREE;
11543 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11549 code = RECORD_TYPE;
11555 code = ENUMERAL_TYPE;
11558 gcc_unreachable ();
11561 /* In case of anonymous name, xref_tag is only called to
11562 make type node and push name. Name lookup is not required. */
11563 if (ANON_AGGRNAME_P (name))
11566 t = lookup_and_check_tag (tag_code, name,
11567 scope, template_header_p);
11569 if (t == error_mark_node)
11570 return error_mark_node;
11572 if (scope != ts_current && t && current_class_type
11573 && template_class_depth (current_class_type)
11574 && template_header_p)
11576 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11577 definition of this tag. Since, in addition, we are currently
11578 processing a (member) template declaration of a template
11579 class, we must be very careful; consider:
11586 { template <class V>
11587 friend struct S1; };
11589 Here, the S2::S1 declaration should not be confused with the
11590 outer declaration. In particular, the inner version should
11591 have a template parameter of level 2, not level 1. This
11592 would be particularly important if the member declaration
11595 template <class V = U> friend struct S1;
11597 say, when we should tsubst into `U' when instantiating
11598 S2. On the other hand, when presented with:
11608 we must find the inner binding eventually. We
11609 accomplish this by making sure that the new type we
11610 create to represent this declaration has the right
11612 context = TYPE_CONTEXT (t);
11618 /* If no such tag is yet defined, create a forward-reference node
11619 and record it as the "definition".
11620 When a real declaration of this type is found,
11621 the forward-reference will be altered into a real type. */
11622 if (code == ENUMERAL_TYPE)
11624 error ("use of enum %q#D without previous declaration", name);
11625 return error_mark_node;
11629 t = make_class_type (code);
11630 TYPE_CONTEXT (t) = context;
11631 t = pushtag (name, t, scope);
11636 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11638 if (!redeclare_class_template (t, current_template_parms))
11639 return error_mark_node;
11641 else if (!processing_template_decl
11642 && CLASS_TYPE_P (t)
11643 && CLASSTYPE_IS_TEMPLATE (t))
11645 error ("redeclaration of %qT as a non-template", t);
11646 error ("previous declaration %q+D", t);
11647 return error_mark_node;
11650 /* Make injected friend class visible. */
11651 if (scope != ts_within_enclosing_non_class
11652 && hidden_name_p (TYPE_NAME (t)))
11654 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11655 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11657 if (TYPE_TEMPLATE_INFO (t))
11659 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11660 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11668 /* Wrapper for xref_tag_1. */
11671 xref_tag (enum tag_types tag_code, tree name,
11672 tag_scope scope, bool template_header_p)
11676 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11677 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11678 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11684 xref_tag_from_type (tree old, tree id, tag_scope scope)
11686 enum tag_types tag_kind;
11688 if (TREE_CODE (old) == RECORD_TYPE)
11689 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11691 tag_kind = union_type;
11693 if (id == NULL_TREE)
11694 id = TYPE_IDENTIFIER (old);
11696 return xref_tag (tag_kind, id, scope, false);
11699 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11700 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11701 access_* node, and the TREE_VALUE is the type of the base-class.
11702 Non-NULL TREE_TYPE indicates virtual inheritance.
11704 Returns true if the binfo hierarchy was successfully created,
11705 false if an error was detected. */
11708 xref_basetypes (tree ref, tree base_list)
11711 tree binfo, base_binfo;
11712 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11713 unsigned max_bases = 0; /* Maximum direct bases. */
11715 tree default_access;
11716 tree igo_prev; /* Track Inheritance Graph Order. */
11718 if (ref == error_mark_node)
11721 /* The base of a derived class is private by default, all others are
11723 default_access = (TREE_CODE (ref) == RECORD_TYPE
11724 && CLASSTYPE_DECLARED_CLASS (ref)
11725 ? access_private_node : access_public_node);
11727 /* First, make sure that any templates in base-classes are
11728 instantiated. This ensures that if we call ourselves recursively
11729 we do not get confused about which classes are marked and which
11731 basep = &base_list;
11734 tree basetype = TREE_VALUE (*basep);
11736 if (!(processing_template_decl && uses_template_parms (basetype))
11737 && !complete_type_or_else (basetype, NULL))
11738 /* An incomplete type. Remove it from the list. */
11739 *basep = TREE_CHAIN (*basep);
11743 if (TREE_TYPE (*basep))
11745 if (CLASS_TYPE_P (basetype))
11746 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11747 basep = &TREE_CHAIN (*basep);
11751 TYPE_MARKED_P (ref) = 1;
11753 /* The binfo slot should be empty, unless this is an (ill-formed)
11755 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11757 error ("redefinition of %q#T", ref);
11761 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11763 binfo = make_tree_binfo (max_bases);
11765 TYPE_BINFO (ref) = binfo;
11766 BINFO_OFFSET (binfo) = size_zero_node;
11767 BINFO_TYPE (binfo) = ref;
11769 /* Apply base-class info set up to the variants of this type. */
11770 fixup_type_variants (ref);
11774 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11775 /* An aggregate cannot have baseclasses. */
11776 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11778 if (TREE_CODE (ref) == UNION_TYPE)
11780 error ("derived union %qT invalid", ref);
11787 if (TYPE_FOR_JAVA (ref))
11789 error ("Java class %qT cannot have multiple bases", ref);
11796 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11798 if (TYPE_FOR_JAVA (ref))
11800 error ("Java class %qT cannot have virtual bases", ref);
11805 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11807 tree access = TREE_PURPOSE (base_list);
11808 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11809 tree basetype = TREE_VALUE (base_list);
11811 if (access == access_default_node)
11812 access = default_access;
11814 if (PACK_EXPANSION_P (basetype))
11815 basetype = PACK_EXPANSION_PATTERN (basetype);
11816 if (TREE_CODE (basetype) == TYPE_DECL)
11817 basetype = TREE_TYPE (basetype);
11818 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11820 error ("base type %qT fails to be a struct or class type",
11825 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11826 TYPE_FOR_JAVA (ref) = 1;
11828 base_binfo = NULL_TREE;
11829 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11831 base_binfo = TYPE_BINFO (basetype);
11832 /* The original basetype could have been a typedef'd type. */
11833 basetype = BINFO_TYPE (base_binfo);
11835 /* Inherit flags from the base. */
11836 TYPE_HAS_NEW_OPERATOR (ref)
11837 |= TYPE_HAS_NEW_OPERATOR (basetype);
11838 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11839 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11840 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11841 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11842 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11843 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11844 CLASSTYPE_REPEATED_BASE_P (ref)
11845 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11848 /* We must do this test after we've seen through a typedef
11850 if (TYPE_MARKED_P (basetype))
11852 if (basetype == ref)
11853 error ("recursive type %qT undefined", basetype);
11855 error ("duplicate base type %qT invalid", basetype);
11859 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11860 /* Regenerate the pack expansion for the bases. */
11861 basetype = make_pack_expansion (basetype);
11863 TYPE_MARKED_P (basetype) = 1;
11865 base_binfo = copy_binfo (base_binfo, basetype, ref,
11866 &igo_prev, via_virtual);
11867 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11868 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11870 BINFO_BASE_APPEND (binfo, base_binfo);
11871 BINFO_BASE_ACCESS_APPEND (binfo, access);
11874 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11875 /* If we have space in the vbase vector, we must have shared at
11876 least one of them, and are therefore diamond shaped. */
11877 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11879 /* Unmark all the types. */
11880 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11881 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11882 TYPE_MARKED_P (ref) = 0;
11884 /* Now see if we have a repeated base type. */
11885 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11887 for (base_binfo = binfo; base_binfo;
11888 base_binfo = TREE_CHAIN (base_binfo))
11890 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11892 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11895 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11897 for (base_binfo = binfo; base_binfo;
11898 base_binfo = TREE_CHAIN (base_binfo))
11899 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11900 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11909 /* Copies the enum-related properties from type SRC to type DST.
11910 Used with the underlying type of an enum and the enum itself. */
11912 copy_type_enum (tree dst, tree src)
11914 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11915 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11916 TYPE_SIZE (dst) = TYPE_SIZE (src);
11917 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11918 SET_TYPE_MODE (dst, TYPE_MODE (src));
11919 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11920 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11921 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11922 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11925 /* Begin compiling the definition of an enumeration type.
11928 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11930 UNDERLYING_TYPE is the type that will be used as the storage for
11931 the enumeration type. This should be NULL_TREE if no storage type
11934 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11936 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11938 Returns the type object, as yet incomplete.
11939 Also records info about it so that build_enumerator
11940 may be used to declare the individual values as they are read. */
11943 start_enum (tree name, tree enumtype, tree underlying_type,
11944 bool scoped_enum_p, bool *is_new)
11946 tree prevtype = NULL_TREE;
11947 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11951 /* [C++0x dcl.enum]p5:
11953 If not explicitly specified, the underlying type of a scoped
11954 enumeration type is int. */
11955 if (!underlying_type && scoped_enum_p)
11956 underlying_type = integer_type_node;
11958 if (underlying_type)
11959 underlying_type = cv_unqualified (underlying_type);
11961 /* If this is the real definition for a previous forward reference,
11962 fill in the contents in the same object that used to be the
11963 forward reference. */
11965 enumtype = lookup_and_check_tag (enum_type, name,
11966 /*tag_scope=*/ts_current,
11967 /*template_header_p=*/false);
11969 /* In case of a template_decl, the only check that should be deferred
11970 to instantiation time is the comparison of underlying types. */
11971 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11973 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11975 error_at (input_location, "scoped/unscoped mismatch "
11976 "in enum %q#T", enumtype);
11977 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11978 "previous definition here");
11979 enumtype = error_mark_node;
11981 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11983 error_at (input_location, "underlying type mismatch "
11984 "in enum %q#T", enumtype);
11985 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11986 "previous definition here");
11987 enumtype = error_mark_node;
11989 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11990 && !dependent_type_p (underlying_type)
11991 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11992 && !same_type_p (underlying_type,
11993 ENUM_UNDERLYING_TYPE (enumtype)))
11995 error_at (input_location, "different underlying type "
11996 "in enum %q#T", enumtype);
11997 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11998 "previous definition here");
11999 underlying_type = NULL_TREE;
12003 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12004 || processing_template_decl)
12006 /* In case of error, make a dummy enum to allow parsing to
12008 if (enumtype == error_mark_node)
12010 name = make_anon_name ();
12011 enumtype = NULL_TREE;
12014 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12015 of an opaque enum, or an opaque enum of an already defined
12016 enumeration (C++0x only).
12017 In any other case, it'll be NULL_TREE. */
12023 prevtype = enumtype;
12024 enumtype = cxx_make_type (ENUMERAL_TYPE);
12025 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12026 if (enumtype == error_mark_node)
12027 return error_mark_node;
12029 /* The enum is considered opaque until the opening '{' of the
12030 enumerator list. */
12031 SET_OPAQUE_ENUM_P (enumtype, true);
12032 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12035 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12037 if (underlying_type)
12039 if (CP_INTEGRAL_TYPE_P (underlying_type))
12041 copy_type_enum (enumtype, underlying_type);
12042 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12044 else if (dependent_type_p (underlying_type))
12045 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12047 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12048 underlying_type, enumtype);
12051 /* If into a template class, the returned enum is always the first
12052 declaration (opaque or not) seen. This way all the references to
12053 this type will be to the same declaration. The following ones are used
12054 only to check for definition errors. */
12055 if (prevtype && processing_template_decl)
12061 /* After processing and defining all the values of an enumeration type,
12062 install their decls in the enumeration type.
12063 ENUMTYPE is the type object. */
12066 finish_enum_value_list (tree enumtype)
12069 tree underlying_type;
12072 tree minnode, maxnode;
12075 bool fixed_underlying_type_p
12076 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12078 /* We built up the VALUES in reverse order. */
12079 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12081 /* For an enum defined in a template, just set the type of the values;
12082 all further processing is postponed until the template is
12083 instantiated. We need to set the type so that tsubst of a CONST_DECL
12085 if (processing_template_decl)
12087 for (values = TYPE_VALUES (enumtype);
12089 values = TREE_CHAIN (values))
12090 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12094 /* Determine the minimum and maximum values of the enumerators. */
12095 if (TYPE_VALUES (enumtype))
12097 minnode = maxnode = NULL_TREE;
12099 for (values = TYPE_VALUES (enumtype);
12101 values = TREE_CHAIN (values))
12103 decl = TREE_VALUE (values);
12105 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12106 each enumerator has the type of its enumeration. Prior to the
12107 closing brace, the type of each enumerator is the type of its
12108 initializing value. */
12109 TREE_TYPE (decl) = enumtype;
12111 /* Update the minimum and maximum values, if appropriate. */
12112 value = DECL_INITIAL (decl);
12113 if (value == error_mark_node)
12114 value = integer_zero_node;
12115 /* Figure out what the minimum and maximum values of the
12116 enumerators are. */
12118 minnode = maxnode = value;
12119 else if (tree_int_cst_lt (maxnode, value))
12121 else if (tree_int_cst_lt (value, minnode))
12128 If the enumerator-list is empty, the underlying type is as if
12129 the enumeration had a single enumerator with value 0. */
12130 minnode = maxnode = integer_zero_node;
12132 if (!fixed_underlying_type_p)
12134 /* Compute the number of bits require to represent all values of the
12135 enumeration. We must do this before the type of MINNODE and
12136 MAXNODE are transformed, since tree_int_cst_min_precision relies
12137 on the TREE_TYPE of the value it is passed. */
12138 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12139 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12140 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12141 int precision = MAX (lowprec, highprec);
12143 bool use_short_enum;
12145 /* Determine the underlying type of the enumeration.
12149 The underlying type of an enumeration is an integral type that
12150 can represent all the enumerator values defined in the
12151 enumeration. It is implementation-defined which integral type is
12152 used as the underlying type for an enumeration except that the
12153 underlying type shall not be larger than int unless the value of
12154 an enumerator cannot fit in an int or unsigned int.
12156 We use "int" or an "unsigned int" as the underlying type, even if
12157 a smaller integral type would work, unless the user has
12158 explicitly requested that we use the smallest possible type. The
12159 user can request that for all enumerations with a command line
12160 flag, or for just one enumeration with an attribute. */
12162 use_short_enum = flag_short_enums
12163 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12165 for (itk = (use_short_enum ? itk_char : itk_int);
12169 underlying_type = integer_types[itk];
12170 if (underlying_type != NULL_TREE
12171 && TYPE_PRECISION (underlying_type) >= precision
12172 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12175 if (itk == itk_none)
12179 IF no integral type can represent all the enumerator values, the
12180 enumeration is ill-formed. */
12181 error ("no integral type can represent all of the enumerator values "
12182 "for %qT", enumtype);
12183 precision = TYPE_PRECISION (long_long_integer_type_node);
12184 underlying_type = integer_types[itk_unsigned_long_long];
12189 The value of sizeof() applied to an enumeration type, an object
12190 of an enumeration type, or an enumerator, is the value of sizeof()
12191 applied to the underlying type. */
12192 copy_type_enum (enumtype, underlying_type);
12194 /* Compute the minimum and maximum values for the type.
12198 For an enumeration where emin is the smallest enumerator and emax
12199 is the largest, the values of the enumeration are the values of the
12200 underlying type in the range bmin to bmax, where bmin and bmax are,
12201 respectively, the smallest and largest values of the smallest bit-
12202 field that can store emin and emax. */
12204 /* The middle-end currently assumes that types with TYPE_PRECISION
12205 narrower than their underlying type are suitably zero or sign
12206 extended to fill their mode. Similarly, it assumes that the front
12207 end assures that a value of a particular type must be within
12208 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12210 We used to set these fields based on bmin and bmax, but that led
12211 to invalid assumptions like optimizing away bounds checking. So
12212 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12213 TYPE_MAX_VALUE to the values for the mode above and only restrict
12214 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12215 ENUM_UNDERLYING_TYPE (enumtype)
12216 = build_distinct_type_copy (underlying_type);
12217 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12218 set_min_and_max_values_for_integral_type
12219 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12221 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12222 if (flag_strict_enums)
12223 set_min_and_max_values_for_integral_type (enumtype, precision,
12227 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12229 /* Convert each of the enumerators to the type of the underlying
12230 type of the enumeration. */
12231 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12233 location_t saved_location;
12235 decl = TREE_VALUE (values);
12236 saved_location = input_location;
12237 input_location = DECL_SOURCE_LOCATION (decl);
12238 if (fixed_underlying_type_p)
12239 /* If the enumeration type has a fixed underlying type, we
12240 already checked all of the enumerator values. */
12241 value = DECL_INITIAL (decl);
12243 value = perform_implicit_conversion (underlying_type,
12244 DECL_INITIAL (decl),
12245 tf_warning_or_error);
12246 input_location = saved_location;
12248 /* Do not clobber shared ints. */
12249 value = copy_node (value);
12251 TREE_TYPE (value) = enumtype;
12252 DECL_INITIAL (decl) = value;
12255 /* Fix up all variant types of this enum type. */
12256 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12257 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12259 /* Finish debugging output for this type. */
12260 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12263 /* Finishes the enum type. This is called only the first time an
12264 enumeration is seen, be it opaque or odinary.
12265 ENUMTYPE is the type object. */
12268 finish_enum (tree enumtype)
12270 if (processing_template_decl)
12272 if (at_function_scope_p ())
12273 add_stmt (build_min (TAG_DEFN, enumtype));
12277 /* Here there should not be any variants of this type. */
12278 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12279 && !TYPE_NEXT_VARIANT (enumtype));
12282 /* Build and install a CONST_DECL for an enumeration constant of the
12283 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12284 LOC is the location of NAME.
12285 Assignment of sequential values by default is handled here. */
12288 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12294 /* If the VALUE was erroneous, pretend it wasn't there; that will
12295 result in the enum being assigned the next value in sequence. */
12296 if (value == error_mark_node)
12299 /* Remove no-op casts from the value. */
12301 STRIP_TYPE_NOPS (value);
12303 if (! processing_template_decl)
12305 /* Validate and default VALUE. */
12306 if (value != NULL_TREE)
12308 value = cxx_constant_value (value);
12310 if (TREE_CODE (value) == INTEGER_CST
12311 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12313 value = perform_integral_promotions (value);
12317 error ("enumerator value for %qD is not an integer constant", name);
12322 /* Default based on previous value. */
12323 if (value == NULL_TREE)
12325 if (TYPE_VALUES (enumtype))
12328 unsigned HOST_WIDE_INT lo;
12332 /* C++03 7.2/4: If no initializer is specified for the first
12333 enumerator, the type is an unspecified integral
12334 type. Otherwise the type is the same as the type of the
12335 initializing value of the preceding enumerator unless the
12336 incremented value is not representable in that type, in
12337 which case the type is an unspecified integral type
12338 sufficient to contain the incremented value. */
12339 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12340 if (error_operand_p (prev_value))
12341 value = error_mark_node;
12344 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12345 TREE_INT_CST_HIGH (prev_value),
12350 tree type = TREE_TYPE (prev_value);
12351 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12352 di.low = lo; di.high = hi;
12353 if (!double_int_fits_to_tree_p (type, di))
12356 for (itk = itk_int; itk != itk_none; itk++)
12358 type = integer_types[itk];
12359 if (type != NULL_TREE
12360 && (pos || !TYPE_UNSIGNED (type))
12361 && double_int_fits_to_tree_p (type, di))
12364 if (type && cxx_dialect < cxx0x
12365 && itk > itk_unsigned_long)
12366 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12367 incremented enumerator value is too large for %<unsigned long%>" : "\
12368 incremented enumerator value is too large for %<long%>");
12370 if (type == NULL_TREE)
12373 value = double_int_to_tree (type, di);
12378 error ("overflow in enumeration values at %qD", name);
12379 value = error_mark_node;
12384 value = integer_zero_node;
12387 /* Remove no-op casts from the value. */
12388 STRIP_TYPE_NOPS (value);
12390 /* If the underlying type of the enum is fixed, check whether
12391 the enumerator values fits in the underlying type. If it
12392 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12393 if (ENUM_UNDERLYING_TYPE (enumtype)
12395 && TREE_CODE (value) == INTEGER_CST
12396 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12398 error ("enumerator value %E is too large for underlying type %<%T%>",
12399 value, ENUM_UNDERLYING_TYPE (enumtype));
12401 /* Silently convert the value so that we can continue. */
12402 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12407 /* C++ associates enums with global, function, or class declarations. */
12408 context = current_scope ();
12410 /* Build the actual enumeration constant. Note that the enumeration
12411 constants have the underlying type of the enum (if it is fixed)
12412 or the type of their initializer (if the underlying type of the
12413 enum is not fixed):
12417 If the underlying type is fixed, the type of each enumerator
12418 prior to the closing brace is the underlying type; if the
12419 initializing value of an enumerator cannot be represented by
12420 the underlying type, the program is ill-formed. If the
12421 underlying type is not fixed, the type of each enumerator is
12422 the type of its initializing value.
12424 If the underlying type is not fixed, it will be computed by
12425 finish_enum and we will reset the type of this enumerator. Of
12426 course, if we're processing a template, there may be no value. */
12427 type = value ? TREE_TYPE (value) : NULL_TREE;
12429 if (context && context == current_class_type)
12430 /* This enum declaration is local to the class. We need the full
12431 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12432 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12434 /* It's a global enum, or it's local to a function. (Note local to
12435 a function could mean local to a class method. */
12436 decl = build_decl (loc, CONST_DECL, name, type);
12438 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12439 TREE_CONSTANT (decl) = 1;
12440 TREE_READONLY (decl) = 1;
12441 DECL_INITIAL (decl) = value;
12443 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12444 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12445 on the TYPE_FIELDS list for `S'. (That's so that you can say
12446 things like `S::i' later.) */
12447 finish_member_declaration (decl);
12451 /* Add this enumeration constant to the list for this type. */
12452 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12455 /* Look for an enumerator with the given NAME within the enumeration
12456 type ENUMTYPE. This routine is used primarily for qualified name
12457 lookup into an enumerator in C++0x, e.g.,
12459 enum class Color { Red, Green, Blue };
12461 Color color = Color::Red;
12463 Returns the value corresponding to the enumerator, or
12464 NULL_TREE if no such enumerator was found. */
12466 lookup_enumerator (tree enumtype, tree name)
12469 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12471 e = purpose_member (name, TYPE_VALUES (enumtype));
12472 return e? TREE_VALUE (e) : NULL_TREE;
12476 /* We're defining DECL. Make sure that its type is OK. */
12479 check_function_type (tree decl, tree current_function_parms)
12481 tree fntype = TREE_TYPE (decl);
12482 tree return_type = complete_type (TREE_TYPE (fntype));
12484 /* In a function definition, arg types must be complete. */
12485 require_complete_types_for_parms (current_function_parms);
12487 if (dependent_type_p (return_type))
12489 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12490 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12492 tree args = TYPE_ARG_TYPES (fntype);
12494 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12495 error ("return type %q#T is incomplete", return_type);
12497 error ("return type has Java class type %q#T", return_type);
12499 /* Make it return void instead. */
12500 if (TREE_CODE (fntype) == METHOD_TYPE)
12501 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12503 TREE_CHAIN (args));
12505 fntype = build_function_type (void_type_node, args);
12507 = build_exception_variant (fntype,
12508 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12509 fntype = (cp_build_type_attribute_variant
12510 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12511 TREE_TYPE (decl) = fntype;
12514 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12517 /* Create the FUNCTION_DECL for a function definition.
12518 DECLSPECS and DECLARATOR are the parts of the declaration;
12519 they describe the function's name and the type it returns,
12520 but twisted together in a fashion that parallels the syntax of C.
12522 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12523 DECLARATOR is really the DECL for the function we are about to
12524 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12525 indicating that the function is an inline defined in-class.
12527 This function creates a binding context for the function body
12528 as well as setting up the FUNCTION_DECL in current_function_decl.
12530 For C++, we must first check whether that datum makes any sense.
12531 For example, "class A local_a(1,2);" means that variable local_a
12532 is an aggregate of type A, which should have a constructor
12533 applied to it with the argument list [1, 2].
12535 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12536 or may be a BLOCK if the function has been defined previously
12537 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12538 error_mark_node if the function has never been defined, or
12539 a BLOCK if the function has been defined somewhere. */
12542 start_preparsed_function (tree decl1, tree attrs, int flags)
12544 tree ctype = NULL_TREE;
12547 int doing_friend = 0;
12548 cp_binding_level *bl;
12549 tree current_function_parms;
12550 struct c_fileinfo *finfo
12551 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12552 bool honor_interface;
12554 /* Sanity check. */
12555 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12556 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12558 fntype = TREE_TYPE (decl1);
12559 if (TREE_CODE (fntype) == METHOD_TYPE)
12560 ctype = TYPE_METHOD_BASETYPE (fntype);
12562 /* ISO C++ 11.4/5. A friend function defined in a class is in
12563 the (lexical) scope of the class in which it is defined. */
12564 if (!ctype && DECL_FRIEND_P (decl1))
12566 ctype = DECL_FRIEND_CONTEXT (decl1);
12568 /* CTYPE could be null here if we're dealing with a template;
12569 for example, `inline friend float foo()' inside a template
12570 will have no CTYPE set. */
12571 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12577 if (DECL_DECLARED_INLINE_P (decl1)
12578 && lookup_attribute ("noinline", attrs))
12579 warning (0, "inline function %q+D given attribute noinline", decl1);
12581 /* Handle gnu_inline attribute. */
12582 if (GNU_INLINE_P (decl1))
12584 DECL_EXTERNAL (decl1) = 1;
12585 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12586 DECL_INTERFACE_KNOWN (decl1) = 1;
12587 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12590 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12591 /* This is a constructor, we must ensure that any default args
12592 introduced by this definition are propagated to the clones
12593 now. The clones are used directly in overload resolution. */
12594 adjust_clone_args (decl1);
12596 /* Sometimes we don't notice that a function is a static member, and
12597 build a METHOD_TYPE for it. Fix that up now. */
12598 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12599 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12601 /* Set up current_class_type, and enter the scope of the class, if
12604 push_nested_class (ctype);
12605 else if (DECL_STATIC_FUNCTION_P (decl1))
12606 push_nested_class (DECL_CONTEXT (decl1));
12608 /* Now that we have entered the scope of the class, we must restore
12609 the bindings for any template parameters surrounding DECL1, if it
12610 is an inline member template. (Order is important; consider the
12611 case where a template parameter has the same name as a field of
12612 the class.) It is not until after this point that
12613 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12614 if (flags & SF_INCLASS_INLINE)
12615 maybe_begin_member_template_processing (decl1);
12617 /* Effective C++ rule 15. */
12619 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12620 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12621 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12623 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12624 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12625 if (!DECL_INITIAL (decl1))
12626 DECL_INITIAL (decl1) = error_mark_node;
12628 /* This function exists in static storage.
12629 (This does not mean `static' in the C sense!) */
12630 TREE_STATIC (decl1) = 1;
12632 /* We must call push_template_decl after current_class_type is set
12633 up. (If we are processing inline definitions after exiting a
12634 class scope, current_class_type will be NULL_TREE until set above
12635 by push_nested_class.) */
12636 if (processing_template_decl)
12638 /* FIXME: Handle error_mark_node more gracefully. */
12639 tree newdecl1 = push_template_decl (decl1);
12640 if (newdecl1 != error_mark_node)
12644 /* We are now in the scope of the function being defined. */
12645 current_function_decl = decl1;
12647 /* Save the parm names or decls from this function's declarator
12648 where store_parm_decls will find them. */
12649 current_function_parms = DECL_ARGUMENTS (decl1);
12651 /* Make sure the parameter and return types are reasonable. When
12652 you declare a function, these types can be incomplete, but they
12653 must be complete when you define the function. */
12654 check_function_type (decl1, current_function_parms);
12656 /* Build the return declaration for the function. */
12657 restype = TREE_TYPE (fntype);
12658 if (DECL_RESULT (decl1) == NULL_TREE)
12662 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12663 DECL_ARTIFICIAL (resdecl) = 1;
12664 DECL_IGNORED_P (resdecl) = 1;
12665 DECL_RESULT (decl1) = resdecl;
12667 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12670 /* Let the user know we're compiling this function. */
12671 announce_function (decl1);
12673 /* Record the decl so that the function name is defined.
12674 If we already have a decl for this name, and it is a FUNCTION_DECL,
12675 use the old decl. */
12676 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12678 /* A specialization is not used to guide overload resolution. */
12679 if (!DECL_FUNCTION_MEMBER_P (decl1)
12680 && !(DECL_USE_TEMPLATE (decl1) &&
12681 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12683 tree olddecl = pushdecl (decl1);
12685 if (olddecl == error_mark_node)
12686 /* If something went wrong when registering the declaration,
12687 use DECL1; we have to have a FUNCTION_DECL to use when
12688 parsing the body of the function. */
12692 /* Otherwise, OLDDECL is either a previous declaration
12693 of the same function or DECL1 itself. */
12695 if (warn_missing_declarations
12696 && olddecl == decl1
12697 && !DECL_MAIN_P (decl1)
12698 && TREE_PUBLIC (decl1)
12699 && !DECL_DECLARED_INLINE_P (decl1))
12703 /* Check whether DECL1 is in an anonymous
12705 for (context = DECL_CONTEXT (decl1);
12707 context = DECL_CONTEXT (context))
12709 if (TREE_CODE (context) == NAMESPACE_DECL
12710 && DECL_NAME (context) == NULL_TREE)
12714 if (context == NULL)
12715 warning (OPT_Wmissing_declarations,
12716 "no previous declaration for %q+D", decl1);
12724 /* We need to set the DECL_CONTEXT. */
12725 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12726 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12728 fntype = TREE_TYPE (decl1);
12730 /* If #pragma weak applies, mark the decl appropriately now.
12731 The pragma only applies to global functions. Because
12732 determining whether or not the #pragma applies involves
12733 computing the mangled name for the declaration, we cannot
12734 apply the pragma until after we have merged this declaration
12735 with any previous declarations; if the original declaration
12736 has a linkage specification, that specification applies to
12737 the definition as well, and may affect the mangled name. */
12738 if (DECL_FILE_SCOPE_P (decl1))
12739 maybe_apply_pragma_weak (decl1);
12742 /* Reset this in case the call to pushdecl changed it. */
12743 current_function_decl = decl1;
12745 gcc_assert (DECL_INITIAL (decl1));
12747 /* This function may already have been parsed, in which case just
12748 return; our caller will skip over the body without parsing. */
12749 if (DECL_INITIAL (decl1) != error_mark_node)
12752 /* Initialize RTL machinery. We cannot do this until
12753 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12754 even when processing a template; this is how we get
12755 CFUN set up, and our per-function variables initialized.
12756 FIXME factor out the non-RTL stuff. */
12757 bl = current_binding_level;
12758 allocate_struct_function (decl1, processing_template_decl);
12760 /* Initialize the language data structures. Whenever we start
12761 a new function, we destroy temporaries in the usual way. */
12762 cfun->language = ggc_alloc_cleared_language_function ();
12763 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12764 current_binding_level = bl;
12766 /* Start the statement-tree, start the tree now. */
12767 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12769 /* If we are (erroneously) defining a function that we have already
12770 defined before, wipe out what we knew before. */
12771 if (!DECL_PENDING_INLINE_P (decl1))
12772 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12774 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12776 /* We know that this was set up by `grokclassfn'. We do not
12777 wait until `store_parm_decls', since evil parse errors may
12778 never get us to that point. Here we keep the consistency
12779 between `current_class_type' and `current_class_ptr'. */
12780 tree t = DECL_ARGUMENTS (decl1);
12782 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12783 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12785 cp_function_chain->x_current_class_ref
12786 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12787 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12788 cp_function_chain->x_current_class_ptr = t;
12790 /* Constructors and destructors need to know whether they're "in
12791 charge" of initializing virtual base classes. */
12792 t = DECL_CHAIN (t);
12793 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12795 current_in_charge_parm = t;
12796 t = DECL_CHAIN (t);
12798 if (DECL_HAS_VTT_PARM_P (decl1))
12800 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12801 current_vtt_parm = t;
12805 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12806 /* Implicitly-defined methods (like the
12807 destructor for a class in which no destructor
12808 is explicitly declared) must not be defined
12809 until their definition is needed. So, we
12810 ignore interface specifications for
12811 compiler-generated functions. */
12812 && !DECL_ARTIFICIAL (decl1));
12814 if (processing_template_decl)
12815 /* Don't mess with interface flags. */;
12816 else if (DECL_INTERFACE_KNOWN (decl1))
12818 tree ctx = decl_function_context (decl1);
12820 if (DECL_NOT_REALLY_EXTERN (decl1))
12821 DECL_EXTERNAL (decl1) = 0;
12823 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12824 && TREE_PUBLIC (ctx))
12825 /* This is a function in a local class in an extern inline
12827 comdat_linkage (decl1);
12829 /* If this function belongs to an interface, it is public.
12830 If it belongs to someone else's interface, it is also external.
12831 This only affects inlines and template instantiations. */
12832 else if (!finfo->interface_unknown && honor_interface)
12834 if (DECL_DECLARED_INLINE_P (decl1)
12835 || DECL_TEMPLATE_INSTANTIATION (decl1))
12837 DECL_EXTERNAL (decl1)
12838 = (finfo->interface_only
12839 || (DECL_DECLARED_INLINE_P (decl1)
12840 && ! flag_implement_inlines
12841 && !DECL_VINDEX (decl1)));
12843 /* For WIN32 we also want to put these in linkonce sections. */
12844 maybe_make_one_only (decl1);
12847 DECL_EXTERNAL (decl1) = 0;
12848 DECL_INTERFACE_KNOWN (decl1) = 1;
12849 /* If this function is in an interface implemented in this file,
12850 make sure that the back end knows to emit this function
12852 if (!DECL_EXTERNAL (decl1))
12853 mark_needed (decl1);
12855 else if (finfo->interface_unknown && finfo->interface_only
12856 && honor_interface)
12858 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12859 interface, we will have both finfo->interface_unknown and
12860 finfo->interface_only set. In that case, we don't want to
12861 use the normal heuristics because someone will supply a
12862 #pragma implementation elsewhere, and deducing it here would
12863 produce a conflict. */
12864 comdat_linkage (decl1);
12865 DECL_EXTERNAL (decl1) = 0;
12866 DECL_INTERFACE_KNOWN (decl1) = 1;
12867 DECL_DEFER_OUTPUT (decl1) = 1;
12871 /* This is a definition, not a reference.
12872 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12873 if (!GNU_INLINE_P (decl1))
12874 DECL_EXTERNAL (decl1) = 0;
12876 if ((DECL_DECLARED_INLINE_P (decl1)
12877 || DECL_TEMPLATE_INSTANTIATION (decl1))
12878 && ! DECL_INTERFACE_KNOWN (decl1))
12879 DECL_DEFER_OUTPUT (decl1) = 1;
12881 DECL_INTERFACE_KNOWN (decl1) = 1;
12884 /* Determine the ELF visibility attribute for the function. We must not
12885 do this before calling "pushdecl", as we must allow "duplicate_decls"
12886 to merge any attributes appropriately. We also need to wait until
12888 if (!DECL_CLONED_FUNCTION_P (decl1))
12889 determine_visibility (decl1);
12891 begin_scope (sk_function_parms, decl1);
12895 if (DECL_DESTRUCTOR_P (decl1)
12896 || (DECL_CONSTRUCTOR_P (decl1)
12897 && targetm.cxx.cdtor_returns_this ()))
12899 cdtor_label = build_decl (input_location,
12900 LABEL_DECL, NULL_TREE, NULL_TREE);
12901 DECL_CONTEXT (cdtor_label) = current_function_decl;
12904 start_fname_decls ();
12906 store_parm_decls (current_function_parms);
12910 /* Like start_preparsed_function, except that instead of a
12911 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12913 Returns 1 on success. If the DECLARATOR is not suitable for a function
12914 (it defines a datum instead), we return 0, which tells
12915 yyparse to report a parse error. */
12918 start_function (cp_decl_specifier_seq *declspecs,
12919 const cp_declarator *declarator,
12924 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12925 if (decl1 == error_mark_node)
12927 /* If the declarator is not suitable for a function definition,
12928 cause a syntax error. */
12929 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12931 error ("invalid function declaration");
12935 if (DECL_MAIN_P (decl1))
12936 /* main must return int. grokfndecl should have corrected it
12937 (and issued a diagnostic) if the user got it wrong. */
12938 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12939 integer_type_node));
12941 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12946 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12950 use_eh_spec_block (tree fn)
12952 return (flag_exceptions && flag_enforce_eh_specs
12953 && !processing_template_decl
12954 && !type_throw_all_p (TREE_TYPE (fn))
12955 /* We insert the EH_SPEC_BLOCK only in the original
12956 function; then, it is copied automatically to the
12958 && !DECL_CLONED_FUNCTION_P (fn)
12959 /* Implicitly-generated constructors and destructors have
12960 exception specifications. However, those specifications
12961 are the union of the possible exceptions specified by the
12962 constructors/destructors for bases and members, so no
12963 unallowed exception will ever reach this function. By
12964 not creating the EH_SPEC_BLOCK we save a little memory,
12965 and we avoid spurious warnings about unreachable
12967 && !DECL_DEFAULTED_FN (fn));
12970 /* Store the parameter declarations into the current function declaration.
12971 This is called after parsing the parameter declarations, before
12972 digesting the body of the function.
12974 Also install to binding contour return value identifier, if any. */
12977 store_parm_decls (tree current_function_parms)
12979 tree fndecl = current_function_decl;
12982 /* This is a chain of any other decls that came in among the parm
12983 declarations. If a parm is declared with enum {foo, bar} x;
12984 then CONST_DECLs for foo and bar are put here. */
12985 tree nonparms = NULL_TREE;
12987 if (current_function_parms)
12989 /* This case is when the function was defined with an ANSI prototype.
12990 The parms already have decls, so we need not do anything here
12991 except record them as in effect
12992 and complain if any redundant old-style parm decls were written. */
12994 tree specparms = current_function_parms;
12997 /* Must clear this because it might contain TYPE_DECLs declared
12999 current_binding_level->names = NULL;
13001 /* If we're doing semantic analysis, then we'll call pushdecl
13002 for each of these. We must do them in reverse order so that
13003 they end in the correct forward order. */
13004 specparms = nreverse (specparms);
13006 for (parm = specparms; parm; parm = next)
13008 next = DECL_CHAIN (parm);
13009 if (TREE_CODE (parm) == PARM_DECL)
13011 if (DECL_NAME (parm) == NULL_TREE
13012 || TREE_CODE (parm) != VOID_TYPE)
13015 error ("parameter %qD declared void", parm);
13019 /* If we find an enum constant or a type tag,
13020 put it aside for the moment. */
13021 TREE_CHAIN (parm) = NULL_TREE;
13022 nonparms = chainon (nonparms, parm);
13026 /* Get the decls in their original chain order and record in the
13027 function. This is all and only the PARM_DECLs that were
13028 pushed into scope by the loop above. */
13029 DECL_ARGUMENTS (fndecl) = getdecls ();
13032 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13034 /* Now store the final chain of decls for the arguments
13035 as the decl-chain of the current lexical scope.
13036 Put the enumerators in as well, at the front so that
13037 DECL_ARGUMENTS is not modified. */
13038 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13040 if (use_eh_spec_block (current_function_decl))
13041 current_eh_spec_block = begin_eh_spec_block ();
13045 /* We have finished doing semantic analysis on DECL, but have not yet
13046 generated RTL for its body. Save away our current state, so that
13047 when we want to generate RTL later we know what to do. */
13050 save_function_data (tree decl)
13052 struct language_function *f;
13054 /* Save the language-specific per-function data so that we can
13055 get it back when we really expand this function. */
13056 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13059 f = ggc_alloc_language_function ();
13060 memcpy (f, cp_function_chain, sizeof (struct language_function));
13061 DECL_SAVED_FUNCTION_DATA (decl) = f;
13063 /* Clear out the bits we don't need. */
13064 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13065 f->bindings = NULL;
13066 f->x_local_names = NULL;
13070 /* Set the return value of the constructor (if present). */
13073 finish_constructor_body (void)
13078 if (targetm.cxx.cdtor_returns_this ()
13079 && (! TYPE_FOR_JAVA (current_class_type)))
13081 /* Any return from a constructor will end up here. */
13082 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13084 val = DECL_ARGUMENTS (current_function_decl);
13085 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13086 DECL_RESULT (current_function_decl), val);
13087 /* Return the address of the object. */
13088 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13089 add_stmt (exprstmt);
13093 /* Do all the processing for the beginning of a destructor; set up the
13094 vtable pointers and cleanups for bases and members. */
13097 begin_destructor_body (void)
13099 tree compound_stmt;
13101 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13102 issued an error message. We still want to try to process the
13103 body of the function, but initialize_vtbl_ptrs will crash if
13104 TYPE_BINFO is NULL. */
13105 if (COMPLETE_TYPE_P (current_class_type))
13107 compound_stmt = begin_compound_stmt (0);
13108 /* Make all virtual function table pointers in non-virtual base
13109 classes point to CURRENT_CLASS_TYPE's virtual function
13111 initialize_vtbl_ptrs (current_class_ptr);
13112 finish_compound_stmt (compound_stmt);
13114 /* And insert cleanups for our bases and members so that they
13115 will be properly destroyed if we throw. */
13116 push_base_cleanups ();
13120 /* At the end of every destructor we generate code to delete the object if
13121 necessary. Do that now. */
13124 finish_destructor_body (void)
13128 /* Any return from a destructor will end up here; that way all base
13129 and member cleanups will be run when the function returns. */
13130 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13132 /* In a virtual destructor, we must call delete. */
13133 if (DECL_VIRTUAL_P (current_function_decl))
13136 tree virtual_size = cxx_sizeof (current_class_type);
13140 At the point of definition of a virtual destructor (including
13141 an implicit definition), non-placement operator delete shall
13142 be looked up in the scope of the destructor's class and if
13143 found shall be accessible and unambiguous. */
13144 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13146 /*global_p=*/false,
13147 /*placement=*/NULL_TREE,
13148 /*alloc_fn=*/NULL_TREE);
13150 if_stmt = begin_if_stmt ();
13151 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13152 current_in_charge_parm,
13155 finish_expr_stmt (exprstmt);
13156 finish_then_clause (if_stmt);
13157 finish_if_stmt (if_stmt);
13160 if (targetm.cxx.cdtor_returns_this ())
13164 val = DECL_ARGUMENTS (current_function_decl);
13165 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13166 DECL_RESULT (current_function_decl), val);
13167 /* Return the address of the object. */
13168 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13169 add_stmt (exprstmt);
13173 /* Do the necessary processing for the beginning of a function body, which
13174 in this case includes member-initializers, but not the catch clauses of
13175 a function-try-block. Currently, this means opening a binding level
13176 for the member-initializers (in a ctor), member cleanups (in a dtor),
13177 and capture proxies (in a lambda operator()). */
13180 begin_function_body (void)
13184 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13187 if (processing_template_decl)
13188 /* Do nothing now. */;
13190 /* Always keep the BLOCK node associated with the outermost pair of
13191 curly braces of a function. These are needed for correct
13192 operation of dwarfout.c. */
13193 keep_next_level (true);
13195 stmt = begin_compound_stmt (BCS_FN_BODY);
13197 if (processing_template_decl)
13198 /* Do nothing now. */;
13199 else if (DECL_DESTRUCTOR_P (current_function_decl))
13200 begin_destructor_body ();
13205 /* Do the processing for the end of a function body. Currently, this means
13206 closing out the cleanups for fully-constructed bases and members, and in
13207 the case of the destructor, deleting the object if desired. Again, this
13208 is only meaningful for [cd]tors, since they are the only functions where
13209 there is a significant distinction between the main body and any
13210 function catch clauses. Handling, say, main() return semantics here
13211 would be wrong, as flowing off the end of a function catch clause for
13212 main() would also need to return 0. */
13215 finish_function_body (tree compstmt)
13217 if (compstmt == NULL_TREE)
13220 /* Close the block. */
13221 finish_compound_stmt (compstmt);
13223 if (processing_template_decl)
13224 /* Do nothing now. */;
13225 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13226 finish_constructor_body ();
13227 else if (DECL_DESTRUCTOR_P (current_function_decl))
13228 finish_destructor_body ();
13231 /* Given a function, returns the BLOCK corresponding to the outermost level
13232 of curly braces, skipping the artificial block created for constructor
13236 outer_curly_brace_block (tree fndecl)
13238 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13239 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13240 /* Skip the artificial function body block. */
13241 block = BLOCK_SUBBLOCKS (block);
13245 /* If FNDECL is a class's key method, add the class to the list of
13246 keyed classes that should be emitted. */
13249 record_key_method_defined (tree fndecl)
13251 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13252 && DECL_VIRTUAL_P (fndecl)
13253 && !processing_template_decl)
13255 tree fnclass = DECL_CONTEXT (fndecl);
13256 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13257 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13261 /* Subroutine of finish_function.
13262 Save the body of constexpr functions for possible
13263 future compile time evaluation. */
13266 maybe_save_function_definition (tree fun)
13268 if (!processing_template_decl
13269 && DECL_DECLARED_CONSTEXPR_P (fun)
13270 && !DECL_CLONED_FUNCTION_P (fun))
13271 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13274 /* Finish up a function declaration and compile that function
13275 all the way to assembler language output. The free the storage
13276 for the function definition.
13278 FLAGS is a bitwise or of the following values:
13280 We just finished processing the body of an in-class inline
13281 function definition. (This processing will have taken place
13282 after the class definition is complete.) */
13285 finish_function (int flags)
13287 tree fndecl = current_function_decl;
13288 tree fntype, ctype = NULL_TREE;
13289 int inclass_inline = (flags & 2) != 0;
13291 /* When we get some parse errors, we can end up without a
13292 current_function_decl, so cope. */
13293 if (fndecl == NULL_TREE)
13294 return error_mark_node;
13296 if (c_dialect_objc ())
13297 objc_finish_function ();
13299 gcc_assert (!defer_mark_used_calls);
13300 defer_mark_used_calls = true;
13302 record_key_method_defined (fndecl);
13304 fntype = TREE_TYPE (fndecl);
13306 /* TREE_READONLY (fndecl) = 1;
13307 This caused &foo to be of type ptr-to-const-function
13308 which then got a warning when stored in a ptr-to-function variable. */
13310 gcc_assert (building_stmt_list_p ());
13311 /* The current function is being defined, so its DECL_INITIAL should
13312 be set, and unless there's a multiple definition, it should be
13313 error_mark_node. */
13314 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13316 /* For a cloned function, we've already got all the code we need;
13317 there's no need to add any extra bits. */
13318 if (!DECL_CLONED_FUNCTION_P (fndecl))
13320 if (DECL_MAIN_P (current_function_decl))
13322 /* Make it so that `main' always returns 0 by default (or
13325 finish_return_stmt (integer_one_node);
13327 finish_return_stmt (integer_zero_node);
13331 if (use_eh_spec_block (current_function_decl))
13332 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13333 (TREE_TYPE (current_function_decl)),
13334 current_eh_spec_block);
13337 /* If we're saving up tree structure, tie off the function now. */
13338 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13340 finish_fname_decls ();
13342 /* If this function can't throw any exceptions, remember that. */
13343 if (!processing_template_decl
13344 && !cp_function_chain->can_throw
13345 && !flag_non_call_exceptions
13346 && !decl_replaceable_p (fndecl))
13347 TREE_NOTHROW (fndecl) = 1;
13349 /* This must come after expand_function_end because cleanups might
13350 have declarations (from inline functions) that need to go into
13351 this function's blocks. */
13353 /* If the current binding level isn't the outermost binding level
13354 for this function, either there is a bug, or we have experienced
13355 syntax errors and the statement tree is malformed. */
13356 if (current_binding_level->kind != sk_function_parms)
13358 /* Make sure we have already experienced errors. */
13359 gcc_assert (errorcount);
13361 /* Throw away the broken statement tree and extra binding
13363 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13365 while (current_binding_level->kind != sk_function_parms)
13367 if (current_binding_level->kind == sk_class)
13368 pop_nested_class ();
13370 poplevel (0, 0, 0);
13373 poplevel (1, 0, 1);
13375 /* Statements should always be full-expressions at the outermost set
13376 of curly braces for a function. */
13377 gcc_assert (stmts_are_full_exprs_p ());
13379 /* Save constexpr function body before it gets munged by
13380 the NRV transformation. */
13381 maybe_save_function_definition (fndecl);
13383 /* Set up the named return value optimization, if we can. Candidate
13384 variables are selected in check_return_expr. */
13385 if (current_function_return_value)
13387 tree r = current_function_return_value;
13390 if (r != error_mark_node
13391 /* This is only worth doing for fns that return in memory--and
13392 simpler, since we don't have to worry about promoted modes. */
13393 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13394 /* Only allow this for variables declared in the outer scope of
13395 the function so we know that their lifetime always ends with a
13396 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13397 we were to do this optimization in tree-ssa. */
13398 && (outer = outer_curly_brace_block (fndecl))
13399 && chain_member (r, BLOCK_VARS (outer)))
13400 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13402 current_function_return_value = NULL_TREE;
13405 /* Remember that we were in class scope. */
13406 if (current_class_name)
13407 ctype = current_class_type;
13409 /* Must mark the RESULT_DECL as being in this function. */
13410 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13412 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13413 to the FUNCTION_DECL node itself. */
13414 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13416 /* Save away current state, if appropriate. */
13417 if (!processing_template_decl)
13418 save_function_data (fndecl);
13420 /* Complain if there's just no return statement. */
13421 if (warn_return_type
13422 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13423 && !dependent_type_p (TREE_TYPE (fntype))
13424 && !current_function_returns_value && !current_function_returns_null
13425 /* Don't complain if we abort or throw. */
13426 && !current_function_returns_abnormally
13427 /* Don't complain if we are declared noreturn. */
13428 && !TREE_THIS_VOLATILE (fndecl)
13429 && !DECL_NAME (DECL_RESULT (fndecl))
13430 && !TREE_NO_WARNING (fndecl)
13431 /* Structor return values (if any) are set by the compiler. */
13432 && !DECL_CONSTRUCTOR_P (fndecl)
13433 && !DECL_DESTRUCTOR_P (fndecl))
13435 warning (OPT_Wreturn_type,
13436 "no return statement in function returning non-void");
13437 TREE_NO_WARNING (fndecl) = 1;
13440 /* Store the end of the function, so that we get good line number
13441 info for the epilogue. */
13442 cfun->function_end_locus = input_location;
13444 /* Complain about parameters that are only set, but never otherwise used. */
13445 if (warn_unused_but_set_parameter
13446 && !processing_template_decl
13447 && errorcount == unused_but_set_errorcount
13448 && !DECL_CLONED_FUNCTION_P (fndecl))
13452 for (decl = DECL_ARGUMENTS (fndecl);
13454 decl = DECL_CHAIN (decl))
13455 if (TREE_USED (decl)
13456 && TREE_CODE (decl) == PARM_DECL
13457 && !DECL_READ_P (decl)
13458 && DECL_NAME (decl)
13459 && !DECL_ARTIFICIAL (decl)
13460 && !TREE_NO_WARNING (decl)
13461 && !DECL_IN_SYSTEM_HEADER (decl)
13462 && TREE_TYPE (decl) != error_mark_node
13463 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13464 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13465 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13466 warning (OPT_Wunused_but_set_parameter,
13467 "parameter %q+D set but not used", decl);
13468 unused_but_set_errorcount = errorcount;
13471 /* Complain about locally defined typedefs that are not used in this
13473 maybe_warn_unused_local_typedefs ();
13475 /* Genericize before inlining. */
13476 if (!processing_template_decl)
13478 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13479 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13480 cp_genericize (fndecl);
13481 /* Clear out the bits we don't need. */
13482 f->x_current_class_ptr = NULL;
13483 f->x_current_class_ref = NULL;
13484 f->x_eh_spec_block = NULL;
13485 f->x_in_charge_parm = NULL;
13486 f->x_vtt_parm = NULL;
13487 f->x_return_value = NULL;
13488 f->bindings = NULL;
13489 f->extern_decl_map = NULL;
13491 /* Clear out the bits we don't need. */
13492 local_names = NULL;
13494 /* We're leaving the context of this function, so zap cfun. It's still in
13495 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13497 current_function_decl = NULL;
13499 /* If this is an in-class inline definition, we may have to pop the
13500 bindings for the template parameters that we added in
13501 maybe_begin_member_template_processing when start_function was
13503 if (inclass_inline)
13504 maybe_end_member_template_processing ();
13506 /* Leave the scope of the class. */
13508 pop_nested_class ();
13513 current_function_decl = NULL_TREE;
13515 defer_mark_used_calls = false;
13516 if (deferred_mark_used_calls)
13521 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13523 VEC_free (tree, gc, deferred_mark_used_calls);
13529 /* Create the FUNCTION_DECL for a function definition.
13530 DECLSPECS and DECLARATOR are the parts of the declaration;
13531 they describe the return type and the name of the function,
13532 but twisted together in a fashion that parallels the syntax of C.
13534 This function creates a binding context for the function body
13535 as well as setting up the FUNCTION_DECL in current_function_decl.
13537 Returns a FUNCTION_DECL on success.
13539 If the DECLARATOR is not suitable for a function (it defines a datum
13540 instead), we return 0, which tells yyparse to report a parse error.
13542 May return void_type_node indicating that this method is actually
13543 a friend. See grokfield for more details.
13545 Came here with a `.pushlevel' .
13547 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13548 CHANGES TO CODE IN `grokfield'. */
13551 grokmethod (cp_decl_specifier_seq *declspecs,
13552 const cp_declarator *declarator, tree attrlist)
13554 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13557 if (fndecl == error_mark_node)
13558 return error_mark_node;
13560 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13562 error ("invalid member function declaration");
13563 return error_mark_node;
13567 cplus_decl_attributes (&fndecl, attrlist, 0);
13569 /* Pass friends other than inline friend functions back. */
13570 if (fndecl == void_type_node)
13573 if (DECL_IN_AGGR_P (fndecl))
13575 if (DECL_CLASS_SCOPE_P (fndecl))
13576 error ("%qD is already defined in class %qT", fndecl,
13577 DECL_CONTEXT (fndecl));
13578 return error_mark_node;
13581 check_template_shadow (fndecl);
13583 DECL_DECLARED_INLINE_P (fndecl) = 1;
13584 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13586 /* We process method specializations in finish_struct_1. */
13587 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13589 fndecl = push_template_decl (fndecl);
13590 if (fndecl == error_mark_node)
13594 if (! DECL_FRIEND_P (fndecl))
13596 if (DECL_CHAIN (fndecl))
13598 fndecl = copy_node (fndecl);
13599 TREE_CHAIN (fndecl) = NULL_TREE;
13603 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13605 DECL_IN_AGGR_P (fndecl) = 1;
13610 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13611 we can lay it out later, when and if its type becomes complete. */
13614 maybe_register_incomplete_var (tree var)
13616 gcc_assert (TREE_CODE (var) == VAR_DECL);
13618 /* Keep track of variables with incomplete types. */
13619 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13620 && DECL_EXTERNAL (var))
13622 tree inner_type = TREE_TYPE (var);
13624 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13625 inner_type = TREE_TYPE (inner_type);
13626 inner_type = TYPE_MAIN_VARIANT (inner_type);
13628 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13629 /* RTTI TD entries are created while defining the type_info. */
13630 || (TYPE_LANG_SPECIFIC (inner_type)
13631 && TYPE_BEING_DEFINED (inner_type)))
13634 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13636 iv->incomplete_type = inner_type;
13641 /* Called when a class type (given by TYPE) is defined. If there are
13642 any existing VAR_DECLs whose type has been completed by this
13643 declaration, update them now. */
13646 complete_vars (tree type)
13649 incomplete_var *iv;
13651 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13653 if (same_type_p (type, iv->incomplete_type))
13655 tree var = iv->decl;
13656 tree type = TREE_TYPE (var);
13657 /* Complete the type of the variable. The VAR_DECL itself
13658 will be laid out in expand_expr. */
13659 complete_type (type);
13660 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13661 /* Remove this entry from the list. */
13662 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13668 /* Check for pending declarations which may have abstract type. */
13669 complete_type_check_abstract (type);
13672 /* If DECL is of a type which needs a cleanup, build and return an
13673 expression to perform that cleanup here. Return NULL_TREE if no
13674 cleanup need be done. */
13677 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13683 /* Assume no cleanup is required. */
13684 cleanup = NULL_TREE;
13686 if (error_operand_p (decl))
13689 /* Handle "__attribute__((cleanup))". We run the cleanup function
13690 before the destructor since the destructor is what actually
13691 terminates the lifetime of the object. */
13692 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13699 /* Get the name specified by the user for the cleanup function. */
13700 id = TREE_VALUE (TREE_VALUE (attr));
13701 /* Look up the name to find the cleanup function to call. It is
13702 important to use lookup_name here because that is what is
13703 used in c-common.c:handle_cleanup_attribute when performing
13704 initial checks on the attribute. Note that those checks
13705 include ensuring that the function found is not an overloaded
13706 function, or an object with an overloaded call operator,
13707 etc.; we can rely on the fact that the function found is an
13708 ordinary FUNCTION_DECL. */
13709 fn = lookup_name (id);
13710 arg = build_address (decl);
13712 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13713 if (cleanup == error_mark_node)
13714 return error_mark_node;
13716 /* Handle ordinary C++ destructors. */
13717 type = TREE_TYPE (decl);
13718 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13720 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13721 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13722 && CLASSTYPE_VBASECLASSES (type));
13726 if (TREE_CODE (type) == ARRAY_TYPE)
13729 addr = build_address (decl);
13731 /* Optimize for space over speed here. */
13732 if (!has_vbases || flag_expensive_optimizations)
13733 flags |= LOOKUP_NONVIRTUAL;
13735 call = build_delete (TREE_TYPE (addr), addr,
13736 sfk_complete_destructor, flags, 0, complain);
13737 if (call == error_mark_node)
13738 cleanup = error_mark_node;
13740 cleanup = cp_build_compound_expr (cleanup, call, complain);
13748 /* When a stmt has been parsed, this function is called. */
13755 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13756 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13757 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13760 static_fn_type (tree memfntype)
13765 if (TYPE_PTRMEMFUNC_P (memfntype))
13766 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13767 if (POINTER_TYPE_P (memfntype)
13768 || TREE_CODE (memfntype) == FUNCTION_DECL)
13769 memfntype = TREE_TYPE (memfntype);
13770 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13772 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13773 args = TYPE_ARG_TYPES (memfntype);
13774 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13775 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13776 fntype = (cp_build_type_attribute_variant
13777 (fntype, TYPE_ATTRIBUTES (memfntype)));
13778 fntype = (build_exception_variant
13779 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13783 /* DECL was originally constructed as a non-static member function,
13784 but turned out to be static. Update it accordingly. */
13787 revert_static_member_fn (tree decl)
13789 tree stype = static_fn_type (decl);
13790 cp_cv_quals quals = type_memfn_quals (stype);
13792 if (quals != TYPE_UNQUALIFIED)
13793 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13795 TREE_TYPE (decl) = stype;
13797 if (DECL_ARGUMENTS (decl))
13798 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13799 DECL_STATIC_FUNCTION_P (decl) = 1;
13802 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13803 one of the language-independent trees. */
13805 enum cp_tree_node_structure_enum
13806 cp_tree_node_structure (union lang_tree_node * t)
13808 switch (TREE_CODE (&t->generic))
13810 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13811 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13812 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13813 case OVERLOAD: return TS_CP_OVERLOAD;
13814 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13815 case PTRMEM_CST: return TS_CP_PTRMEM;
13816 case BASELINK: return TS_CP_BASELINK;
13817 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13818 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13819 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13820 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13821 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13822 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13823 default: return TS_CP_GENERIC;
13827 /* Build the void_list_node (void_type_node having been created). */
13829 build_void_list_node (void)
13831 tree t = build_tree_list (NULL_TREE, void_type_node);
13836 cp_missing_noreturn_ok_p (tree decl)
13838 /* A missing noreturn is ok for the `main' function. */
13839 return DECL_MAIN_P (decl);
13842 /* Return the COMDAT group into which DECL should be placed. */
13845 cxx_comdat_group (tree decl)
13849 /* Virtual tables, construction virtual tables, and virtual table
13850 tables all go in a single COMDAT group, named after the primary
13852 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13853 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13854 /* For all other DECLs, the COMDAT group is the mangled name of the
13855 declaration itself. */
13858 while (DECL_THUNK_P (decl))
13860 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13861 into the same section as the target function. In that case
13862 we must return target's name. */
13863 tree target = THUNK_TARGET (decl);
13864 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13865 && DECL_SECTION_NAME (target) != NULL
13866 && DECL_ONE_ONLY (target))
13871 name = DECL_ASSEMBLER_NAME (decl);
13877 #include "gt-cp-decl.h"