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, 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, VEC(tree,gc) **);
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 gcc_assert (DECL_P (newdecl));
957 if (TREE_CODE (newdecl) == FUNCTION_DECL)
959 tree f1 = TREE_TYPE (newdecl);
960 tree f2 = TREE_TYPE (olddecl);
961 tree p1 = TYPE_ARG_TYPES (f1);
962 tree p2 = TYPE_ARG_TYPES (f2);
964 /* Specializations of different templates are different functions
965 even if they have the same type. */
966 tree t1 = (DECL_USE_TEMPLATE (newdecl)
967 ? DECL_TI_TEMPLATE (newdecl)
969 tree t2 = (DECL_USE_TEMPLATE (olddecl)
970 ? DECL_TI_TEMPLATE (olddecl)
975 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
976 && ! (DECL_EXTERN_C_P (newdecl)
977 && DECL_EXTERN_C_P (olddecl)))
980 #ifdef NO_IMPLICIT_EXTERN_C
981 /* A new declaration doesn't match a built-in one unless it
982 is also extern "C". */
983 if (DECL_IS_BUILTIN (olddecl)
984 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
988 if (TREE_CODE (f1) != TREE_CODE (f2))
991 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
993 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
994 && (DECL_BUILT_IN (olddecl)
995 #ifndef NO_IMPLICIT_EXTERN_C
996 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
997 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1001 types_match = self_promoting_args_p (p1);
1002 if (p1 == void_list_node)
1003 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1005 #ifndef NO_IMPLICIT_EXTERN_C
1006 else if (!prototype_p (f1)
1007 && (DECL_EXTERN_C_P (olddecl)
1008 && DECL_IN_SYSTEM_HEADER (olddecl)
1009 && !DECL_CLASS_SCOPE_P (olddecl))
1010 && (DECL_EXTERN_C_P (newdecl)
1011 && DECL_IN_SYSTEM_HEADER (newdecl)
1012 && !DECL_CLASS_SCOPE_P (newdecl)))
1014 types_match = self_promoting_args_p (p2);
1015 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1021 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1022 || comp_type_attributes (TREE_TYPE (newdecl),
1023 TREE_TYPE (olddecl)) != 0);
1028 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1030 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1031 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1034 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1035 DECL_TEMPLATE_PARMS (olddecl)))
1038 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1039 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1040 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1042 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1043 DECL_TEMPLATE_RESULT (newdecl));
1047 /* Need to check scope for variable declaration (VAR_DECL).
1048 For typedef (TYPE_DECL), scope is ignored. */
1049 if (TREE_CODE (newdecl) == VAR_DECL
1050 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1052 Two declarations for an object with C language linkage
1053 with the same name (ignoring the namespace that qualify
1054 it) that appear in different namespace scopes refer to
1056 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1059 if (TREE_TYPE (newdecl) == error_mark_node)
1060 types_match = TREE_TYPE (olddecl) == error_mark_node;
1061 else if (TREE_TYPE (olddecl) == NULL_TREE)
1062 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1063 else if (TREE_TYPE (newdecl) == NULL_TREE)
1066 types_match = comptypes (TREE_TYPE (newdecl),
1067 TREE_TYPE (olddecl),
1068 COMPARE_REDECLARATION);
1074 /* If NEWDECL is `static' and an `extern' was seen previously,
1075 warn about it. OLDDECL is the previous declaration.
1077 Note that this does not apply to the C++ case of declaring
1078 a variable `extern const' and then later `const'.
1080 Don't complain about built-in functions, since they are beyond
1081 the user's control. */
1084 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1086 if (TREE_CODE (newdecl) == TYPE_DECL
1087 || TREE_CODE (newdecl) == TEMPLATE_DECL
1088 || TREE_CODE (newdecl) == CONST_DECL
1089 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1092 /* Don't get confused by static member functions; that's a different
1094 if (TREE_CODE (newdecl) == FUNCTION_DECL
1095 && DECL_STATIC_FUNCTION_P (newdecl))
1098 /* If the old declaration was `static', or the new one isn't, then
1099 everything is OK. */
1100 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1103 /* It's OK to declare a builtin function as `static'. */
1104 if (TREE_CODE (olddecl) == FUNCTION_DECL
1105 && DECL_ARTIFICIAL (olddecl))
1108 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1109 permerror (input_location, "previous declaration of %q+D", olddecl);
1112 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1113 function templates. If their exception specifications do not
1114 match, issue a diagnostic. */
1117 check_redeclaration_exception_specification (tree new_decl,
1122 tree new_exceptions;
1123 tree old_exceptions;
1125 new_type = TREE_TYPE (new_decl);
1126 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1127 old_type = TREE_TYPE (old_decl);
1128 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1132 If any declaration of a function has an exception-specification,
1133 all declarations, including the definition and an explicit
1134 specialization, of that function shall have an
1135 exception-specification with the same set of type-ids. */
1136 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1137 && ! DECL_IS_BUILTIN (old_decl)
1139 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1141 error ("declaration of %qF has a different exception specifier",
1143 error ("from previous declaration %q+F", old_decl);
1147 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1148 Otherwise issue diagnostics. */
1151 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1153 old_decl = STRIP_TEMPLATE (old_decl);
1154 new_decl = STRIP_TEMPLATE (new_decl);
1155 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1156 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1158 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1159 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1161 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1163 /* Hide a built-in declaration. */
1164 DECL_DECLARED_CONSTEXPR_P (old_decl)
1165 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1168 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1169 error ("from previous declaration %q+D", old_decl);
1173 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1174 && lookup_attribute ("gnu_inline", \
1175 DECL_ATTRIBUTES (fn)))
1177 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1178 If the redeclaration is invalid, a diagnostic is issued, and the
1179 error_mark_node is returned. Otherwise, OLDDECL is returned.
1181 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1184 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1187 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1189 unsigned olddecl_uid = DECL_UID (olddecl);
1190 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1191 int new_defines_function = 0;
1192 tree new_template_info;
1194 if (newdecl == olddecl)
1197 types_match = decls_match (newdecl, olddecl);
1199 /* If either the type of the new decl or the type of the old decl is an
1200 error_mark_node, then that implies that we have already issued an
1201 error (earlier) for some bogus type specification, and in that case,
1202 it is rather pointless to harass the user with yet more error message
1203 about the same declaration, so just pretend the types match here. */
1204 if (TREE_TYPE (newdecl) == error_mark_node
1205 || TREE_TYPE (olddecl) == error_mark_node)
1206 return error_mark_node;
1208 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1209 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1211 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1212 && TREE_CODE (olddecl) != TEMPLATE_DECL
1213 && check_raw_literal_operator (olddecl))
1214 error ("literal operator template %q+D conflicts with"
1215 " raw literal operator %qD", newdecl, olddecl);
1216 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1217 && TREE_CODE (olddecl) == TEMPLATE_DECL
1218 && check_raw_literal_operator (newdecl))
1219 error ("raw literal operator %q+D conflicts with"
1220 " literal operator template %qD", newdecl, olddecl);
1223 if (DECL_P (olddecl)
1224 && TREE_CODE (newdecl) == FUNCTION_DECL
1225 && TREE_CODE (olddecl) == FUNCTION_DECL
1226 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1228 if (DECL_DECLARED_INLINE_P (newdecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1231 /* Already warned elsewhere. */;
1232 else if (DECL_DECLARED_INLINE_P (olddecl)
1233 && DECL_UNINLINABLE (olddecl)
1234 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1235 /* Already warned. */;
1236 else if (DECL_DECLARED_INLINE_P (newdecl)
1237 && DECL_UNINLINABLE (olddecl)
1238 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1240 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1242 warning (OPT_Wattributes, "previous declaration of %q+D "
1243 "with attribute noinline", olddecl);
1245 else if (DECL_DECLARED_INLINE_P (olddecl)
1246 && DECL_UNINLINABLE (newdecl)
1247 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1249 warning (OPT_Wattributes, "function %q+D redeclared with "
1250 "attribute noinline", newdecl);
1251 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1256 /* Check for redeclaration and other discrepancies. */
1257 if (TREE_CODE (olddecl) == FUNCTION_DECL
1258 && DECL_ARTIFICIAL (olddecl))
1260 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1261 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1263 /* Avoid warnings redeclaring built-ins which have not been
1264 explicitly declared. */
1265 if (DECL_ANTICIPATED (olddecl))
1268 /* If you declare a built-in or predefined function name as static,
1269 the old definition is overridden, but optionally warn this was a
1270 bad choice of name. */
1271 if (! TREE_PUBLIC (newdecl))
1273 warning (OPT_Wshadow,
1274 DECL_BUILT_IN (olddecl)
1275 ? G_("shadowing built-in function %q#D")
1276 : G_("shadowing library function %q#D"), olddecl);
1277 /* Discard the old built-in function. */
1280 /* If the built-in is not ansi, then programs can override
1281 it even globally without an error. */
1282 else if (! DECL_BUILT_IN (olddecl))
1283 warning (0, "library function %q#D redeclared as non-function %q#D",
1287 error ("declaration of %q#D", newdecl);
1288 error ("conflicts with built-in declaration %q#D",
1293 else if (!types_match)
1295 /* Avoid warnings redeclaring built-ins which have not been
1296 explicitly declared. */
1297 if (DECL_ANTICIPATED (olddecl))
1299 /* Deal with fileptr_type_node. FILE type is not known
1300 at the time we create the builtins. */
1303 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1304 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1306 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1309 else if (TREE_VALUE (t2) == fileptr_type_node)
1311 tree t = TREE_VALUE (t1);
1313 if (TREE_CODE (t) == POINTER_TYPE
1314 && TYPE_NAME (TREE_TYPE (t))
1315 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1316 == get_identifier ("FILE")
1317 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1319 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1321 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1322 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1323 types_match = decls_match (newdecl, olddecl);
1325 return duplicate_decls (newdecl, olddecl,
1327 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1330 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1333 else if ((DECL_EXTERN_C_P (newdecl)
1334 && DECL_EXTERN_C_P (olddecl))
1335 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1336 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1338 /* A near match; override the builtin. */
1340 if (TREE_PUBLIC (newdecl))
1342 warning (0, "new declaration %q#D", newdecl);
1343 warning (0, "ambiguates built-in declaration %q#D",
1347 warning (OPT_Wshadow,
1348 DECL_BUILT_IN (olddecl)
1349 ? G_("shadowing built-in function %q#D")
1350 : G_("shadowing library function %q#D"), olddecl);
1353 /* Discard the old built-in function. */
1356 /* Replace the old RTL to avoid problems with inlining. */
1357 COPY_DECL_RTL (newdecl, olddecl);
1359 /* Even if the types match, prefer the new declarations type for
1360 built-ins which have not been explicitly declared, for
1361 exception lists, etc... */
1362 else if (DECL_IS_BUILTIN (olddecl))
1364 tree type = TREE_TYPE (newdecl);
1365 tree attribs = (*targetm.merge_type_attributes)
1366 (TREE_TYPE (olddecl), type);
1368 type = cp_build_type_attribute_variant (type, attribs);
1369 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1372 /* If a function is explicitly declared "throw ()", propagate that to
1373 the corresponding builtin. */
1374 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1375 && DECL_ANTICIPATED (olddecl)
1376 && TREE_NOTHROW (newdecl)
1377 && !TREE_NOTHROW (olddecl))
1379 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1380 tree tmpdecl = builtin_decl_explicit (fncode);
1381 if (tmpdecl && tmpdecl != olddecl && types_match)
1382 TREE_NOTHROW (tmpdecl) = 1;
1385 /* Whether or not the builtin can throw exceptions has no
1386 bearing on this declarator. */
1387 TREE_NOTHROW (olddecl) = 0;
1389 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1391 /* If a builtin function is redeclared as `static', merge
1392 the declarations, but make the original one static. */
1393 DECL_THIS_STATIC (olddecl) = 1;
1394 TREE_PUBLIC (olddecl) = 0;
1396 /* Make the old declaration consistent with the new one so
1397 that all remnants of the builtin-ness of this function
1398 will be banished. */
1399 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1400 COPY_DECL_RTL (newdecl, olddecl);
1403 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1405 /* C++ Standard, 3.3, clause 4:
1406 "[Note: a namespace name or a class template name must be unique
1407 in its declarative region (7.3.2, clause 14). ]" */
1408 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1409 && TREE_CODE (newdecl) != NAMESPACE_DECL
1410 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1411 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1412 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1413 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1415 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1416 && TREE_CODE (newdecl) != TYPE_DECL)
1417 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1418 && TREE_CODE (olddecl) != TYPE_DECL))
1420 /* We do nothing special here, because C++ does such nasty
1421 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1422 get shadowed, and know that if we need to find a TYPE_DECL
1423 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1424 slot of the identifier. */
1428 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1429 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1430 || (TREE_CODE (olddecl) == FUNCTION_DECL
1431 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1435 error ("%q#D redeclared as different kind of symbol", newdecl);
1436 if (TREE_CODE (olddecl) == TREE_LIST)
1437 olddecl = TREE_VALUE (olddecl);
1438 error ("previous declaration of %q+#D", olddecl);
1440 return error_mark_node;
1442 else if (!types_match)
1444 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1445 /* These are certainly not duplicate declarations; they're
1446 from different scopes. */
1449 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1451 /* The name of a class template may not be declared to refer to
1452 any other template, class, function, object, namespace, value,
1453 or type in the same scope. */
1454 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1455 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1457 error ("declaration of template %q#D", newdecl);
1458 error ("conflicts with previous declaration %q+#D", olddecl);
1460 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1461 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1462 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1463 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1464 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1465 DECL_TEMPLATE_PARMS (olddecl))
1466 /* Template functions can be disambiguated by
1468 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1469 TREE_TYPE (TREE_TYPE (olddecl))))
1471 error ("new declaration %q#D", newdecl);
1472 error ("ambiguates old declaration %q+#D", olddecl);
1476 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1478 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1480 error ("declaration of C function %q#D conflicts with",
1482 error ("previous declaration %q+#D here", olddecl);
1485 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1486 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1488 error ("new declaration %q#D", newdecl);
1489 error ("ambiguates old declaration %q+#D", olddecl);
1490 return error_mark_node;
1497 error ("conflicting declaration %q#D", newdecl);
1498 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1499 return error_mark_node;
1502 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1503 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1504 && (!DECL_TEMPLATE_INFO (newdecl)
1505 || (DECL_TI_TEMPLATE (newdecl)
1506 != DECL_TI_TEMPLATE (olddecl))))
1507 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1508 && (!DECL_TEMPLATE_INFO (olddecl)
1509 || (DECL_TI_TEMPLATE (olddecl)
1510 != DECL_TI_TEMPLATE (newdecl))))))
1511 /* It's OK to have a template specialization and a non-template
1512 with the same type, or to have specializations of two
1513 different templates with the same type. Note that if one is a
1514 specialization, and the other is an instantiation of the same
1515 template, that we do not exit at this point. That situation
1516 can occur if we instantiate a template class, and then
1517 specialize one of its methods. This situation is valid, but
1518 the declarations must be merged in the usual way. */
1520 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1521 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1522 && !DECL_USE_TEMPLATE (newdecl))
1523 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1524 && !DECL_USE_TEMPLATE (olddecl))))
1525 /* One of the declarations is a template instantiation, and the
1526 other is not a template at all. That's OK. */
1528 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1530 /* In [namespace.alias] we have:
1532 In a declarative region, a namespace-alias-definition can be
1533 used to redefine a namespace-alias declared in that declarative
1534 region to refer only to the namespace to which it already
1537 Therefore, if we encounter a second alias directive for the same
1538 alias, we can just ignore the second directive. */
1539 if (DECL_NAMESPACE_ALIAS (newdecl)
1540 && (DECL_NAMESPACE_ALIAS (newdecl)
1541 == DECL_NAMESPACE_ALIAS (olddecl)))
1543 /* [namespace.alias]
1545 A namespace-name or namespace-alias shall not be declared as
1546 the name of any other entity in the same declarative region.
1547 A namespace-name defined at global scope shall not be
1548 declared as the name of any other entity in any global scope
1550 error ("declaration of namespace %qD conflicts with", newdecl);
1551 error ("previous declaration of namespace %q+D here", olddecl);
1552 return error_mark_node;
1556 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1559 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1560 if (DECL_NAME (olddecl) != NULL_TREE)
1561 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1562 ? G_("%q+#D previously defined here")
1563 : G_("%q+#D previously declared here"), olddecl);
1564 return error_mark_node;
1566 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1567 && DECL_INITIAL (olddecl) != NULL_TREE
1568 && !prototype_p (TREE_TYPE (olddecl))
1569 && prototype_p (TREE_TYPE (newdecl)))
1571 /* Prototype decl follows defn w/o prototype. */
1572 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1573 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1574 "follows non-prototype definition here");
1576 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1577 || TREE_CODE (olddecl) == VAR_DECL)
1578 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1581 If two declarations of the same function or object
1582 specify different linkage-specifications ..., the program
1583 is ill-formed.... Except for functions with C++ linkage,
1584 a function declaration without a linkage specification
1585 shall not precede the first linkage specification for
1586 that function. A function can be declared without a
1587 linkage specification after an explicit linkage
1588 specification has been seen; the linkage explicitly
1589 specified in the earlier declaration is not affected by
1590 such a function declaration.
1592 DR 563 raises the question why the restrictions on
1593 functions should not also apply to objects. Older
1594 versions of G++ silently ignore the linkage-specification
1602 which is clearly wrong. Therefore, we now treat objects
1604 if (current_lang_depth () == 0)
1606 /* There is no explicit linkage-specification, so we use
1607 the linkage from the previous declaration. */
1608 if (!DECL_LANG_SPECIFIC (newdecl))
1609 retrofit_lang_decl (newdecl);
1610 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1614 error ("previous declaration of %q+#D with %qL linkage",
1615 olddecl, DECL_LANGUAGE (olddecl));
1616 error ("conflicts with new declaration with %qL linkage",
1617 DECL_LANGUAGE (newdecl));
1621 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1623 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1625 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1626 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1629 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1630 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1632 for (; t1 && t1 != void_list_node;
1633 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1634 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1636 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1639 permerror (input_location, "default argument given for parameter %d of %q#D",
1641 permerror (input_location, "after previous specification in %q+#D", olddecl);
1645 error ("default argument given for parameter %d of %q#D",
1647 error ("after previous specification in %q+#D",
1654 /* Do not merge an implicit typedef with an explicit one. In:
1658 typedef class A A __attribute__ ((foo));
1660 the attribute should apply only to the typedef. */
1661 if (TREE_CODE (olddecl) == TYPE_DECL
1662 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1663 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1666 /* If new decl is `static' and an `extern' was seen previously,
1668 warn_extern_redeclared_static (newdecl, olddecl);
1670 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1671 return error_mark_node;
1673 /* We have committed to returning 1 at this point. */
1674 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1676 /* Now that functions must hold information normally held
1677 by field decls, there is extra work to do so that
1678 declaration information does not get destroyed during
1680 if (DECL_VINDEX (olddecl))
1681 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1682 if (DECL_CONTEXT (olddecl))
1683 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1684 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1685 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1686 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1687 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1688 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1689 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1690 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1691 SET_OVERLOADED_OPERATOR_CODE
1692 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1693 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1695 /* Optionally warn about more than one declaration for the same
1696 name, but don't warn about a function declaration followed by a
1698 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1699 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1700 /* Don't warn about extern decl followed by definition. */
1701 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1702 /* Don't warn about friends, let add_friend take care of it. */
1703 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1704 /* Don't warn about declaration followed by specialization. */
1705 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1706 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1708 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1709 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1712 if (DECL_DELETED_FN (newdecl))
1714 error ("deleted definition of %qD", newdecl);
1715 error ("after previous declaration %q+D", olddecl);
1717 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1720 /* Deal with C++: must preserve virtual function table size. */
1721 if (TREE_CODE (olddecl) == TYPE_DECL)
1723 tree newtype = TREE_TYPE (newdecl);
1724 tree oldtype = TREE_TYPE (olddecl);
1726 if (newtype != error_mark_node && oldtype != error_mark_node
1727 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1728 CLASSTYPE_FRIEND_CLASSES (newtype)
1729 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1731 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1734 /* Copy all the DECL_... slots specified in the new decl
1735 except for any that we copy here from the old type. */
1736 DECL_ATTRIBUTES (newdecl)
1737 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1739 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1743 old_result = DECL_TEMPLATE_RESULT (olddecl);
1744 new_result = DECL_TEMPLATE_RESULT (newdecl);
1745 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1746 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1747 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1748 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1750 DECL_ATTRIBUTES (old_result)
1751 = (*targetm.merge_decl_attributes) (old_result, new_result);
1753 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1755 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1756 && DECL_INITIAL (new_result))
1758 if (DECL_INITIAL (old_result))
1759 DECL_UNINLINABLE (old_result) = 1;
1761 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1762 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1763 DECL_NOT_REALLY_EXTERN (old_result)
1764 = DECL_NOT_REALLY_EXTERN (new_result);
1765 DECL_INTERFACE_KNOWN (old_result)
1766 = DECL_INTERFACE_KNOWN (new_result);
1767 DECL_DECLARED_INLINE_P (old_result)
1768 = DECL_DECLARED_INLINE_P (new_result);
1769 DECL_DISREGARD_INLINE_LIMITS (old_result)
1770 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1775 DECL_DECLARED_INLINE_P (old_result)
1776 |= DECL_DECLARED_INLINE_P (new_result);
1777 DECL_DISREGARD_INLINE_LIMITS (old_result)
1778 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1779 check_redeclaration_exception_specification (newdecl, olddecl);
1783 /* If the new declaration is a definition, update the file and
1784 line information on the declaration, and also make
1785 the old declaration the same definition. */
1786 if (DECL_INITIAL (new_result) != NULL_TREE)
1788 DECL_SOURCE_LOCATION (olddecl)
1789 = DECL_SOURCE_LOCATION (old_result)
1790 = DECL_SOURCE_LOCATION (newdecl);
1791 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1792 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1795 DECL_ARGUMENTS (old_result)
1796 = DECL_ARGUMENTS (new_result);
1797 for (parm = DECL_ARGUMENTS (old_result); parm;
1798 parm = DECL_CHAIN (parm))
1799 DECL_CONTEXT (parm) = old_result;
1808 /* Automatically handles default parameters. */
1809 tree oldtype = TREE_TYPE (olddecl);
1812 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1813 maybe_instantiate_noexcept (olddecl);
1815 /* Merge the data types specified in the two decls. */
1816 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1818 /* If merge_types produces a non-typedef type, just use the old type. */
1819 if (TREE_CODE (newdecl) == TYPE_DECL
1820 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1823 if (TREE_CODE (newdecl) == VAR_DECL)
1825 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1826 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1827 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1828 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1829 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1830 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1832 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1833 if (DECL_LANG_SPECIFIC (olddecl)
1834 && CP_DECL_THREADPRIVATE_P (olddecl))
1836 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1837 if (!DECL_LANG_SPECIFIC (newdecl))
1838 retrofit_lang_decl (newdecl);
1840 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1841 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1845 /* Do this after calling `merge_types' so that default
1846 parameters don't confuse us. */
1847 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1848 check_redeclaration_exception_specification (newdecl, olddecl);
1849 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1851 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1852 check_default_args (newdecl);
1854 /* Lay the type out, unless already done. */
1855 if (! same_type_p (newtype, oldtype)
1856 && TREE_TYPE (newdecl) != error_mark_node
1857 && !(processing_template_decl && uses_template_parms (newdecl)))
1858 layout_type (TREE_TYPE (newdecl));
1860 if ((TREE_CODE (newdecl) == VAR_DECL
1861 || TREE_CODE (newdecl) == PARM_DECL
1862 || TREE_CODE (newdecl) == RESULT_DECL
1863 || TREE_CODE (newdecl) == FIELD_DECL
1864 || TREE_CODE (newdecl) == TYPE_DECL)
1865 && !(processing_template_decl && uses_template_parms (newdecl)))
1866 layout_decl (newdecl, 0);
1868 /* Merge the type qualifiers. */
1869 if (TREE_READONLY (newdecl))
1870 TREE_READONLY (olddecl) = 1;
1871 if (TREE_THIS_VOLATILE (newdecl))
1872 TREE_THIS_VOLATILE (olddecl) = 1;
1873 if (TREE_NOTHROW (newdecl))
1874 TREE_NOTHROW (olddecl) = 1;
1876 /* Merge deprecatedness. */
1877 if (TREE_DEPRECATED (newdecl))
1878 TREE_DEPRECATED (olddecl) = 1;
1880 /* Preserve function specific target and optimization options */
1881 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1883 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1884 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1885 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1886 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1888 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1889 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1890 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1891 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1894 /* Merge the initialization information. */
1895 if (DECL_INITIAL (newdecl) == NULL_TREE
1896 && DECL_INITIAL (olddecl) != NULL_TREE)
1898 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1899 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1900 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1902 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1903 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1907 /* Merge the section attribute.
1908 We want to issue an error if the sections conflict but that must be
1909 done later in decl_attributes since we are called before attributes
1911 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1912 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1914 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1916 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1917 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1918 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1919 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1920 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1921 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1922 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1923 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1924 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1925 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1926 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1927 /* Keep the old RTL. */
1928 COPY_DECL_RTL (olddecl, newdecl);
1930 else if (TREE_CODE (newdecl) == VAR_DECL
1931 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1933 /* Keep the old RTL. We cannot keep the old RTL if the old
1934 declaration was for an incomplete object and the new
1935 declaration is not since many attributes of the RTL will
1937 COPY_DECL_RTL (olddecl, newdecl);
1940 /* If cannot merge, then use the new type and qualifiers,
1941 and don't preserve the old rtl. */
1944 /* Clean out any memory we had of the old declaration. */
1945 tree oldstatic = value_member (olddecl, static_aggregates);
1947 TREE_VALUE (oldstatic) = error_mark_node;
1949 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1950 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1951 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1952 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1955 /* Merge the storage class information. */
1956 merge_weak (newdecl, olddecl);
1958 if (DECL_ONE_ONLY (olddecl))
1959 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1961 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1962 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1963 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1964 if (! DECL_EXTERNAL (olddecl))
1965 DECL_EXTERNAL (newdecl) = 0;
1967 new_template_info = NULL_TREE;
1968 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1970 bool new_redefines_gnu_inline = false;
1972 if (new_defines_function
1973 && ((DECL_INTERFACE_KNOWN (olddecl)
1974 && TREE_CODE (olddecl) == FUNCTION_DECL)
1975 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1976 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1977 == FUNCTION_DECL))))
1981 if (TREE_CODE (fn) == TEMPLATE_DECL)
1982 fn = DECL_TEMPLATE_RESULT (olddecl);
1984 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1987 if (!new_redefines_gnu_inline)
1989 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1990 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1991 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1993 DECL_TEMPLATE_INSTANTIATED (newdecl)
1994 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1995 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1997 /* If the OLDDECL is an instantiation and/or specialization,
1998 then the NEWDECL must be too. But, it may not yet be marked
1999 as such if the caller has created NEWDECL, but has not yet
2000 figured out that it is a redeclaration. */
2001 if (!DECL_USE_TEMPLATE (newdecl))
2002 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2004 /* Don't really know how much of the language-specific
2005 values we should copy from old to new. */
2006 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2007 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2008 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2009 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2011 if (LANG_DECL_HAS_MIN (newdecl))
2013 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2014 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2015 if (DECL_TEMPLATE_INFO (newdecl))
2016 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2017 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2019 /* Only functions have these fields. */
2020 if (TREE_CODE (newdecl) == FUNCTION_DECL
2021 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2023 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2024 olddecl_friend = DECL_FRIEND_P (olddecl);
2025 hidden_friend = (DECL_ANTICIPATED (olddecl)
2026 && DECL_HIDDEN_FRIEND_P (olddecl)
2027 && newdecl_is_friend);
2028 DECL_BEFRIENDING_CLASSES (newdecl)
2029 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2030 DECL_BEFRIENDING_CLASSES (olddecl));
2031 /* DECL_THUNKS is only valid for virtual functions,
2032 otherwise it is a DECL_FRIEND_CONTEXT. */
2033 if (DECL_VIRTUAL_P (newdecl))
2034 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2036 /* Only variables have this field. */
2037 else if (TREE_CODE (newdecl) == VAR_DECL
2038 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2039 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2042 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2046 /* Merge parameter attributes. */
2047 tree oldarg, newarg;
2048 for (oldarg = DECL_ARGUMENTS(olddecl),
2049 newarg = DECL_ARGUMENTS(newdecl);
2051 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2052 DECL_ATTRIBUTES (newarg)
2053 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2054 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2057 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2058 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2060 /* If newdecl is not a specialization, then it is not a
2061 template-related function at all. And that means that we
2062 should have exited above, returning 0. */
2063 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2065 if (DECL_ODR_USED (olddecl))
2066 /* From [temp.expl.spec]:
2068 If a template, a member template or the member of a class
2069 template is explicitly specialized then that
2070 specialization shall be declared before the first use of
2071 that specialization that would cause an implicit
2072 instantiation to take place, in every translation unit in
2073 which such a use occurs. */
2074 error ("explicit specialization of %qD after first use",
2077 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2079 /* Don't propagate visibility from the template to the
2080 specialization here. We'll do that in determine_visibility if
2082 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2084 /* [temp.expl.spec/14] We don't inline explicit specialization
2085 just because the primary template says so. */
2087 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2088 the always_inline attribute. */
2089 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2090 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2092 if (DECL_DECLARED_INLINE_P (newdecl))
2093 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2095 DECL_ATTRIBUTES (newdecl)
2096 = remove_attribute ("always_inline",
2097 DECL_ATTRIBUTES (newdecl));
2100 else if (new_defines_function && DECL_INITIAL (olddecl))
2102 /* Never inline re-defined extern inline functions.
2103 FIXME: this could be better handled by keeping both
2104 function as separate declarations. */
2105 DECL_UNINLINABLE (newdecl) = 1;
2109 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2110 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2112 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2114 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2115 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2117 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2118 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2119 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2120 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2123 /* Preserve abstractness on cloned [cd]tors. */
2124 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2126 /* Update newdecl's parms to point at olddecl. */
2127 for (parm = DECL_ARGUMENTS (newdecl); parm;
2128 parm = DECL_CHAIN (parm))
2129 DECL_CONTEXT (parm) = olddecl;
2133 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2134 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2135 COPY_DECL_RTL (newdecl, olddecl);
2137 if (! types_match || new_defines_function)
2139 /* These need to be copied so that the names are available.
2140 Note that if the types do match, we'll preserve inline
2141 info and other bits, but if not, we won't. */
2142 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2143 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2145 if (new_defines_function)
2146 /* If defining a function declared with other language
2147 linkage, use the previously declared language linkage. */
2148 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2149 else if (types_match)
2151 /* If redeclaring a builtin function, and not a definition,
2152 it stays built in. */
2153 if (DECL_BUILT_IN (olddecl))
2155 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2156 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2157 /* If we're keeping the built-in definition, keep the rtl,
2158 regardless of declaration matches. */
2159 COPY_DECL_RTL (olddecl, newdecl);
2160 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2162 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2165 /* If a compatible prototype of these builtin functions
2166 is seen, assume the runtime implements it with the
2167 expected semantics. */
2168 case BUILT_IN_STPCPY:
2169 if (builtin_decl_explicit_p (fncode))
2170 set_builtin_decl_implicit_p (fncode, true);
2178 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2179 /* Don't clear out the arguments if we're just redeclaring a
2181 if (DECL_ARGUMENTS (olddecl))
2182 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2185 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2186 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2188 /* Now preserve various other info from the definition. */
2189 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2190 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2191 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2192 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2194 /* Warn about conflicting visibility specifications. */
2195 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2196 && DECL_VISIBILITY_SPECIFIED (newdecl)
2197 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2199 warning_at (input_location, OPT_Wattributes,
2200 "%q+D: visibility attribute ignored because it", newdecl);
2201 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2202 "conflicts with previous declaration here");
2204 /* Choose the declaration which specified visibility. */
2205 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2207 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2208 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2210 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2211 so keep this behavior. */
2212 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2214 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2215 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2217 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2218 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2219 if (TREE_CODE (newdecl) == FIELD_DECL)
2220 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2222 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2223 with that from NEWDECL below. */
2224 if (DECL_LANG_SPECIFIC (olddecl))
2226 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2227 != DECL_LANG_SPECIFIC (newdecl));
2228 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2231 /* Merge the USED information. */
2232 if (TREE_USED (olddecl))
2233 TREE_USED (newdecl) = 1;
2234 else if (TREE_USED (newdecl))
2235 TREE_USED (olddecl) = 1;
2236 if (TREE_CODE (newdecl) == VAR_DECL)
2238 if (DECL_READ_P (olddecl))
2239 DECL_READ_P (newdecl) = 1;
2240 else if (DECL_READ_P (newdecl))
2241 DECL_READ_P (olddecl) = 1;
2243 if (DECL_PRESERVE_P (olddecl))
2244 DECL_PRESERVE_P (newdecl) = 1;
2245 else if (DECL_PRESERVE_P (newdecl))
2246 DECL_PRESERVE_P (olddecl) = 1;
2248 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2252 function_size = sizeof (struct tree_decl_common);
2254 memcpy ((char *) olddecl + sizeof (struct tree_common),
2255 (char *) newdecl + sizeof (struct tree_common),
2256 function_size - sizeof (struct tree_common));
2258 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2259 (char *) newdecl + sizeof (struct tree_decl_common),
2260 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2261 if (new_template_info)
2262 /* If newdecl is a template instantiation, it is possible that
2263 the following sequence of events has occurred:
2265 o A friend function was declared in a class template. The
2266 class template was instantiated.
2268 o The instantiation of the friend declaration was
2269 recorded on the instantiation list, and is newdecl.
2271 o Later, however, instantiate_class_template called pushdecl
2272 on the newdecl to perform name injection. But, pushdecl in
2273 turn called duplicate_decls when it discovered that another
2274 declaration of a global function with the same name already
2277 o Here, in duplicate_decls, we decided to clobber newdecl.
2279 If we're going to do that, we'd better make sure that
2280 olddecl, and not newdecl, is on the list of
2281 instantiations so that if we try to do the instantiation
2282 again we won't get the clobbered declaration. */
2283 reregister_specialization (newdecl,
2289 size_t size = tree_code_size (TREE_CODE (olddecl));
2290 memcpy ((char *) olddecl + sizeof (struct tree_common),
2291 (char *) newdecl + sizeof (struct tree_common),
2292 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2293 switch (TREE_CODE (olddecl))
2303 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2304 (char *) newdecl + sizeof (struct tree_decl_common),
2305 size - sizeof (struct tree_decl_common)
2306 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2310 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2311 (char *) newdecl + sizeof (struct tree_decl_common),
2312 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2313 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2317 DECL_UID (olddecl) = olddecl_uid;
2319 DECL_FRIEND_P (olddecl) = 1;
2322 DECL_ANTICIPATED (olddecl) = 1;
2323 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2326 /* NEWDECL contains the merged attribute lists.
2327 Update OLDDECL to be the same. */
2328 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2330 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2331 so that encode_section_info has a chance to look at the new decl
2332 flags and attributes. */
2333 if (DECL_RTL_SET_P (olddecl)
2334 && (TREE_CODE (olddecl) == FUNCTION_DECL
2335 || (TREE_CODE (olddecl) == VAR_DECL
2336 && TREE_STATIC (olddecl))))
2337 make_decl_rtl (olddecl);
2339 /* The NEWDECL will no longer be needed. Because every out-of-class
2340 declaration of a member results in a call to duplicate_decls,
2341 freeing these nodes represents in a significant savings. */
2347 /* Return zero if the declaration NEWDECL is valid
2348 when the declaration OLDDECL (assumed to be for the same name)
2349 has already been seen.
2350 Otherwise return an error message format string with a %s
2351 where the identifier should go. */
2354 redeclaration_error_message (tree newdecl, tree olddecl)
2356 if (TREE_CODE (newdecl) == TYPE_DECL)
2358 /* Because C++ can put things into name space for free,
2359 constructs like "typedef struct foo { ... } foo"
2360 would look like an erroneous redeclaration. */
2361 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2364 return G_("redefinition of %q#D");
2366 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2368 /* If this is a pure function, its olddecl will actually be
2369 the original initialization to `0' (which we force to call
2370 abort()). Don't complain about redefinition in this case. */
2371 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2372 && DECL_INITIAL (olddecl) == NULL_TREE)
2375 /* If both functions come from different namespaces, this is not
2376 a redeclaration - this is a conflict with a used function. */
2377 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2378 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2379 && ! decls_match (olddecl, newdecl))
2380 return G_("%qD conflicts with used function");
2382 /* We'll complain about linkage mismatches in
2383 warn_extern_redeclared_static. */
2385 /* Defining the same name twice is no good. */
2386 if (DECL_INITIAL (olddecl) != NULL_TREE
2387 && DECL_INITIAL (newdecl) != NULL_TREE)
2389 if (DECL_NAME (olddecl) == NULL_TREE)
2390 return G_("%q#D not declared in class");
2391 else if (!GNU_INLINE_P (olddecl)
2392 || GNU_INLINE_P (newdecl))
2393 return G_("redefinition of %q#D");
2396 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2398 bool olda = GNU_INLINE_P (olddecl);
2399 bool newa = GNU_INLINE_P (newdecl);
2404 return G_("%q+D redeclared inline with "
2405 "%<gnu_inline%> attribute");
2407 return G_("%q+D redeclared inline without "
2408 "%<gnu_inline%> attribute");
2414 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2418 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2420 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2421 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2422 return G_("redefinition of %q#D");
2426 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2427 || (DECL_TEMPLATE_RESULT (newdecl)
2428 == DECL_TEMPLATE_RESULT (olddecl)))
2431 nt = DECL_TEMPLATE_RESULT (newdecl);
2432 if (DECL_TEMPLATE_INFO (nt))
2433 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2434 ot = DECL_TEMPLATE_RESULT (olddecl);
2435 if (DECL_TEMPLATE_INFO (ot))
2436 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2437 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2438 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2439 return G_("redefinition of %q#D");
2441 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2443 bool olda = GNU_INLINE_P (ot);
2444 bool newa = GNU_INLINE_P (nt);
2449 return G_("%q+D redeclared inline with "
2450 "%<gnu_inline%> attribute");
2452 return G_("%q+D redeclared inline without "
2453 "%<gnu_inline%> attribute");
2457 /* Core issue #226 (C++0x):
2459 If a friend function template declaration specifies a
2460 default template-argument, that declaration shall be a
2461 definition and shall be the only declaration of the
2462 function template in the translation unit. */
2463 if ((cxx_dialect != cxx98)
2464 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2465 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2466 /*is_primary=*/1, /*is_partial=*/0,
2467 /*is_friend_decl=*/2))
2468 return G_("redeclaration of friend %q#D "
2469 "may not have default template arguments");
2473 else if (TREE_CODE (newdecl) == VAR_DECL
2474 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2475 && (! DECL_LANG_SPECIFIC (olddecl)
2476 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2477 || DECL_THREAD_LOCAL_P (newdecl)))
2479 /* Only variables can be thread-local, and all declarations must
2480 agree on this property. */
2481 if (DECL_THREAD_LOCAL_P (newdecl))
2482 return G_("thread-local declaration of %q#D follows "
2483 "non-thread-local declaration");
2485 return G_("non-thread-local declaration of %q#D follows "
2486 "thread-local declaration");
2488 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2490 /* The objects have been declared at namespace scope. If either
2491 is a member of an anonymous union, then this is an invalid
2492 redeclaration. For example:
2498 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2499 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2500 return G_("redeclaration of %q#D");
2501 /* If at least one declaration is a reference, there is no
2502 conflict. For example:
2508 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2510 /* Reject two definitions. */
2511 return G_("redefinition of %q#D");
2515 /* Objects declared with block scope: */
2516 /* Reject two definitions, and reject a definition
2517 together with an external reference. */
2518 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2519 return G_("redeclaration of %q#D");
2524 /* Hash and equality functions for the named_label table. */
2527 named_label_entry_hash (const void *data)
2529 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2530 return DECL_UID (ent->label_decl);
2534 named_label_entry_eq (const void *a, const void *b)
2536 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2537 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2538 return ent_a->label_decl == ent_b->label_decl;
2541 /* Create a new label, named ID. */
2544 make_label_decl (tree id, int local_p)
2546 struct named_label_entry *ent;
2550 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2552 DECL_CONTEXT (decl) = current_function_decl;
2553 DECL_MODE (decl) = VOIDmode;
2554 C_DECLARED_LABEL_FLAG (decl) = local_p;
2556 /* Say where one reference is to the label, for the sake of the
2557 error if it is not defined. */
2558 DECL_SOURCE_LOCATION (decl) = input_location;
2560 /* Record the fact that this identifier is bound to this label. */
2561 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2563 /* Create the label htab for the function on demand. */
2565 named_labels = htab_create_ggc (13, named_label_entry_hash,
2566 named_label_entry_eq, NULL);
2568 /* Record this label on the list of labels used in this function.
2569 We do this before calling make_label_decl so that we get the
2570 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2571 ent = ggc_alloc_cleared_named_label_entry ();
2572 ent->label_decl = decl;
2574 slot = htab_find_slot (named_labels, ent, INSERT);
2575 gcc_assert (*slot == NULL);
2581 /* Look for a label named ID in the current function. If one cannot
2582 be found, create one. (We keep track of used, but undefined,
2583 labels, and complain about them at the end of a function.) */
2586 lookup_label_1 (tree id)
2590 /* You can't use labels at global scope. */
2591 if (current_function_decl == NULL_TREE)
2593 error ("label %qE referenced outside of any function", id);
2597 /* See if we've already got this label. */
2598 decl = IDENTIFIER_LABEL_VALUE (id);
2599 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2602 decl = make_label_decl (id, /*local_p=*/0);
2606 /* Wrapper for lookup_label_1. */
2609 lookup_label (tree id)
2612 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2613 ret = lookup_label_1 (id);
2614 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2618 /* Declare a local label named ID. */
2621 declare_local_label (tree id)
2624 cp_label_binding *bind;
2626 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2627 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2628 bind = VEC_safe_push (cp_label_binding, gc,
2629 current_binding_level->shadowed_labels, NULL);
2630 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2632 decl = make_label_decl (id, /*local_p=*/1);
2638 /* Returns nonzero if it is ill-formed to jump past the declaration of
2639 DECL. Returns 2 if it's also a real problem. */
2642 decl_jump_unsafe (tree decl)
2644 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2645 with automatic storage duration is not in scope to a point where it is
2646 in scope is ill-formed unless the variable has scalar type, class type
2647 with a trivial default constructor and a trivial destructor, a
2648 cv-qualified version of one of these types, or an array of one of the
2649 preceding types and is declared without an initializer (8.5). */
2650 tree type = TREE_TYPE (decl);
2652 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2653 || type == error_mark_node)
2656 type = strip_array_types (type);
2658 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2659 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2662 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2668 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2671 identify_goto (tree decl, const location_t *locus)
2674 permerror (input_location, "jump to label %qD", decl);
2676 permerror (input_location, "jump to case label");
2678 permerror (*locus, " from here");
2681 /* Check that a single previously seen jump to a newly defined label
2682 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2683 the jump context; NAMES are the names in scope in LEVEL at the jump
2684 context; LOCUS is the source position of the jump or 0. Returns
2685 true if all is well. */
2688 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2689 bool exited_omp, const location_t *locus)
2691 cp_binding_level *b;
2692 bool identified = false, saw_eh = false, saw_omp = false;
2696 identify_goto (decl, locus);
2697 error (" exits OpenMP structured block");
2698 identified = saw_omp = true;
2701 for (b = current_binding_level; b ; b = b->level_chain)
2703 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2705 for (new_decls = b->names; new_decls != old_decls;
2706 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2707 : TREE_CHAIN (new_decls)))
2709 int problem = decl_jump_unsafe (new_decls);
2715 identify_goto (decl, locus);
2719 error (" crosses initialization of %q+#D", new_decls);
2721 permerror (input_location, " enters scope of %q+#D which has "
2722 "non-trivial destructor", new_decls);
2727 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2731 identify_goto (decl, locus);
2734 if (b->kind == sk_try)
2735 error (" enters try block");
2737 error (" enters catch block");
2740 if (b->kind == sk_omp && !saw_omp)
2744 identify_goto (decl, locus);
2747 error (" enters OpenMP structured block");
2756 check_previous_goto (tree decl, struct named_label_use_entry *use)
2758 check_previous_goto_1 (decl, use->binding_level,
2759 use->names_in_scope, use->in_omp_scope,
2760 &use->o_goto_locus);
2764 check_switch_goto (cp_binding_level* level)
2766 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2769 /* Check that a new jump to a label DECL is OK. Called by
2770 finish_goto_stmt. */
2773 check_goto (tree decl)
2775 struct named_label_entry *ent, dummy;
2776 bool saw_catch = false, identified = false;
2780 /* We can't know where a computed goto is jumping.
2781 So we assume that it's OK. */
2782 if (TREE_CODE (decl) != LABEL_DECL)
2785 /* We didn't record any information about this label when we created it,
2786 and there's not much point since it's trivial to analyze as a return. */
2787 if (decl == cdtor_label)
2790 dummy.label_decl = decl;
2791 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2792 gcc_assert (ent != NULL);
2794 /* If the label hasn't been defined yet, defer checking. */
2795 if (! DECL_INITIAL (decl))
2797 struct named_label_use_entry *new_use;
2799 /* Don't bother creating another use if the last goto had the
2800 same data, and will therefore create the same set of errors. */
2802 && ent->uses->names_in_scope == current_binding_level->names)
2805 new_use = ggc_alloc_named_label_use_entry ();
2806 new_use->binding_level = current_binding_level;
2807 new_use->names_in_scope = current_binding_level->names;
2808 new_use->o_goto_locus = input_location;
2809 new_use->in_omp_scope = false;
2811 new_use->next = ent->uses;
2812 ent->uses = new_use;
2816 if (ent->in_try_scope || ent->in_catch_scope
2817 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2819 permerror (input_location, "jump to label %q+D", decl);
2820 permerror (input_location, " from here");
2824 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2826 int u = decl_jump_unsafe (bad);
2828 if (u > 1 && DECL_ARTIFICIAL (bad))
2830 /* Can't skip init of __exception_info. */
2831 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2835 error (" skips initialization of %q+#D", bad);
2837 permerror (input_location, " enters scope of %q+#D which has "
2838 "non-trivial destructor", bad);
2841 if (ent->in_try_scope)
2842 error (" enters try block");
2843 else if (ent->in_catch_scope && !saw_catch)
2844 error (" enters catch block");
2846 if (ent->in_omp_scope)
2847 error (" enters OpenMP structured block");
2848 else if (flag_openmp)
2850 cp_binding_level *b;
2851 for (b = current_binding_level; b ; b = b->level_chain)
2853 if (b == ent->binding_level)
2855 if (b->kind == sk_omp)
2859 permerror (input_location, "jump to label %q+D", decl);
2860 permerror (input_location, " from here");
2863 error (" exits OpenMP structured block");
2870 /* Check that a return is ok wrt OpenMP structured blocks.
2871 Called by finish_return_stmt. Returns true if all is well. */
2874 check_omp_return (void)
2876 cp_binding_level *b;
2877 for (b = current_binding_level; b ; b = b->level_chain)
2878 if (b->kind == sk_omp)
2880 error ("invalid exit from OpenMP structured block");
2883 else if (b->kind == sk_function_parms)
2888 /* Define a label, specifying the location in the source file.
2889 Return the LABEL_DECL node for the label. */
2892 define_label_1 (location_t location, tree name)
2894 struct named_label_entry *ent, dummy;
2895 cp_binding_level *p;
2898 decl = lookup_label (name);
2900 dummy.label_decl = decl;
2901 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2902 gcc_assert (ent != NULL);
2904 /* After labels, make any new cleanups in the function go into their
2905 own new (temporary) binding contour. */
2906 for (p = current_binding_level;
2907 p->kind != sk_function_parms;
2909 p->more_cleanups_ok = 0;
2911 if (name == get_identifier ("wchar_t"))
2912 permerror (input_location, "label named wchar_t");
2914 if (DECL_INITIAL (decl) != NULL_TREE)
2916 error ("duplicate label %qD", decl);
2917 return error_mark_node;
2921 struct named_label_use_entry *use;
2923 /* Mark label as having been defined. */
2924 DECL_INITIAL (decl) = error_mark_node;
2925 /* Say where in the source. */
2926 DECL_SOURCE_LOCATION (decl) = location;
2928 ent->binding_level = current_binding_level;
2929 ent->names_in_scope = current_binding_level->names;
2931 for (use = ent->uses; use ; use = use->next)
2932 check_previous_goto (decl, use);
2939 /* Wrapper for define_label_1. */
2942 define_label (location_t location, tree name)
2945 timevar_start (TV_NAME_LOOKUP);
2946 ret = define_label_1 (location, name);
2947 timevar_stop (TV_NAME_LOOKUP);
2954 cp_binding_level *level;
2955 struct cp_switch *next;
2956 /* The SWITCH_STMT being built. */
2958 /* A splay-tree mapping the low element of a case range to the high
2959 element, or NULL_TREE if there is no high element. Used to
2960 determine whether or not a new case label duplicates an old case
2961 label. We need a tree, rather than simply a hash table, because
2962 of the GNU case range extension. */
2966 /* A stack of the currently active switch statements. The innermost
2967 switch statement is on the top of the stack. There is no need to
2968 mark the stack for garbage collection because it is only active
2969 during the processing of the body of a function, and we never
2970 collect at that point. */
2972 static struct cp_switch *switch_stack;
2974 /* Called right after a switch-statement condition is parsed.
2975 SWITCH_STMT is the switch statement being parsed. */
2978 push_switch (tree switch_stmt)
2980 struct cp_switch *p = XNEW (struct cp_switch);
2981 p->level = current_binding_level;
2982 p->next = switch_stack;
2983 p->switch_stmt = switch_stmt;
2984 p->cases = splay_tree_new (case_compare, NULL, NULL);
2991 struct cp_switch *cs = switch_stack;
2992 location_t switch_location;
2994 /* Emit warnings as needed. */
2995 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2996 if (!processing_template_decl)
2997 c_do_switch_warnings (cs->cases, switch_location,
2998 SWITCH_STMT_TYPE (cs->switch_stmt),
2999 SWITCH_STMT_COND (cs->switch_stmt));
3001 splay_tree_delete (cs->cases);
3002 switch_stack = switch_stack->next;
3006 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3007 condition. Note that if TYPE and VALUE are already integral we don't
3008 really do the conversion because the language-independent
3009 warning/optimization code will work better that way. */
3012 case_conversion (tree type, tree value)
3014 if (value == NULL_TREE)
3017 if (cxx_dialect >= cxx0x
3018 && (SCOPED_ENUM_P (type)
3019 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3021 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3022 type = type_promotes_to (type);
3023 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3025 return cxx_constant_value (value);
3028 /* Note that we've seen a definition of a case label, and complain if this
3029 is a bad place for one. */
3032 finish_case_label (location_t loc, tree low_value, tree high_value)
3035 cp_binding_level *p;
3038 if (processing_template_decl)
3042 /* For templates, just add the case label; we'll do semantic
3043 analysis at instantiation-time. */
3044 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3045 return add_stmt (build_case_label (low_value, high_value, label));
3048 /* Find the condition on which this switch statement depends. */
3049 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3050 if (cond && TREE_CODE (cond) == TREE_LIST)
3051 cond = TREE_VALUE (cond);
3053 if (!check_switch_goto (switch_stack->level))
3054 return error_mark_node;
3056 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3058 low_value = case_conversion (type, low_value);
3059 high_value = case_conversion (type, high_value);
3061 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3062 low_value, high_value);
3064 /* After labels, make any new cleanups in the function go into their
3065 own new (temporary) binding contour. */
3066 for (p = current_binding_level;
3067 p->kind != sk_function_parms;
3069 p->more_cleanups_ok = 0;
3074 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3077 typename_hash (const void* k)
3080 const_tree const t = (const_tree) k;
3082 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3083 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3088 typedef struct typename_info {
3096 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3097 really of type `typename_info*' */
3100 typename_compare (const void * k1, const void * k2)
3102 const_tree const t1 = (const_tree) k1;
3103 const typename_info *const t2 = (const typename_info *) k2;
3105 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3106 && TYPE_CONTEXT (t1) == t2->scope
3107 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3108 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3109 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3112 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3113 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3115 Returns the new TYPENAME_TYPE. */
3117 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3120 build_typename_type (tree context, tree name, tree fullname,
3121 enum tag_types tag_type)
3129 if (typename_htab == NULL)
3130 typename_htab = htab_create_ggc (61, &typename_hash,
3131 &typename_compare, NULL);
3133 ti.scope = FROB_CONTEXT (context);
3135 ti.template_id = fullname;
3136 ti.enum_p = tag_type == enum_type;
3137 ti.class_p = (tag_type == class_type
3138 || tag_type == record_type
3139 || tag_type == union_type);
3140 hash = (htab_hash_pointer (ti.scope)
3141 ^ htab_hash_pointer (ti.name));
3143 /* See if we already have this type. */
3144 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3149 /* Build the TYPENAME_TYPE. */
3150 t = cxx_make_type (TYPENAME_TYPE);
3151 TYPE_CONTEXT (t) = ti.scope;
3152 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3153 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3154 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3156 /* Build the corresponding TYPE_DECL. */
3157 d = build_decl (input_location, TYPE_DECL, name, t);
3158 TYPE_NAME (TREE_TYPE (d)) = d;
3159 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3160 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3161 DECL_ARTIFICIAL (d) = 1;
3163 /* Store it in the hash table. */
3166 /* TYPENAME_TYPEs must always be compared structurally, because
3167 they may or may not resolve down to another type depending on
3168 the currently open classes. */
3169 SET_TYPE_STRUCTURAL_EQUALITY (t);
3175 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3176 provided to name the type. Returns an appropriate type, unless an
3177 error occurs, in which case error_mark_node is returned. If we
3178 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3179 return that, rather than the _TYPE it corresponds to, in other
3180 cases we look through the type decl. If TF_ERROR is set, complain
3181 about errors, otherwise be quiet. */
3184 make_typename_type (tree context, tree name, enum tag_types tag_type,
3185 tsubst_flags_t complain)
3191 if (name == error_mark_node
3192 || context == NULL_TREE
3193 || context == error_mark_node)
3194 return error_mark_node;
3198 if (!(TYPE_LANG_SPECIFIC (name)
3199 && (CLASSTYPE_IS_TEMPLATE (name)
3200 || CLASSTYPE_USE_TEMPLATE (name))))
3201 name = TYPE_IDENTIFIER (name);
3203 /* Create a TEMPLATE_ID_EXPR for the type. */
3204 name = build_nt (TEMPLATE_ID_EXPR,
3205 CLASSTYPE_TI_TEMPLATE (name),
3206 CLASSTYPE_TI_ARGS (name));
3208 else if (TREE_CODE (name) == TYPE_DECL)
3209 name = DECL_NAME (name);
3213 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3215 name = TREE_OPERAND (name, 0);
3216 if (TREE_CODE (name) == TEMPLATE_DECL)
3217 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3218 else if (TREE_CODE (name) == OVERLOAD)
3220 error ("%qD is not a type", name);
3221 return error_mark_node;
3224 if (TREE_CODE (name) == TEMPLATE_DECL)
3226 error ("%qD used without template parameters", name);
3227 return error_mark_node;
3229 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3230 gcc_assert (TYPE_P (context));
3232 if (!MAYBE_CLASS_TYPE_P (context))
3234 if (complain & tf_error)
3235 error ("%q#T is not a class", context);
3236 return error_mark_node;
3239 /* When the CONTEXT is a dependent type, NAME could refer to a
3240 dependent base class of CONTEXT. But look inside it anyway
3241 if CONTEXT is a currently open scope, in case it refers to a
3242 member of the current instantiation or a non-dependent base;
3243 lookup will stop when we hit a dependent base. */
3244 if (!dependent_scope_p (context))
3245 /* We should only set WANT_TYPE when we're a nested typename type.
3246 Then we can give better diagnostics if we find a non-type. */
3247 t = lookup_field (context, name, 2, /*want_type=*/true);
3251 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3252 return build_typename_type (context, name, fullname, tag_type);
3254 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3258 if (complain & tf_error)
3259 error (want_template ? G_("no class template named %q#T in %q#T")
3260 : G_("no type named %q#T in %q#T"), name, context);
3261 return error_mark_node;
3264 /* Pull out the template from an injected-class-name (or multiple). */
3266 t = maybe_get_template_decl_from_type_decl (t);
3268 if (TREE_CODE (t) == TREE_LIST)
3270 if (complain & tf_error)
3272 error ("lookup of %qT in %qT is ambiguous", name, context);
3273 print_candidates (t);
3275 return error_mark_node;
3278 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3280 if (complain & tf_error)
3281 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3283 return error_mark_node;
3285 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3287 if (complain & tf_error)
3288 error ("%<typename %T::%D%> names %q#T, which is not a type",
3290 return error_mark_node;
3293 if (complain & tf_error)
3294 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3296 /* If we are currently parsing a template and if T is a typedef accessed
3297 through CONTEXT then we need to remember and check access of T at
3298 template instantiation time. */
3299 add_typedef_to_current_template_for_access_check (t, context, input_location);
3302 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3304 /*entering_scope=*/0,
3305 tf_warning_or_error | tf_user);
3307 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3313 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3314 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3315 in which case error_mark_node is returned.
3317 If PARM_LIST is non-NULL, also make sure that the template parameter
3318 list of TEMPLATE_DECL matches.
3320 If COMPLAIN zero, don't complain about any errors that occur. */
3323 make_unbound_class_template (tree context, tree name, tree parm_list,
3324 tsubst_flags_t complain)
3330 name = TYPE_IDENTIFIER (name);
3331 else if (DECL_P (name))
3332 name = DECL_NAME (name);
3333 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3335 if (!dependent_type_p (context)
3336 || currently_open_class (context))
3338 tree tmpl = NULL_TREE;
3340 if (MAYBE_CLASS_TYPE_P (context))
3341 tmpl = lookup_field (context, name, 0, false);
3343 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3344 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3346 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3348 if (complain & tf_error)
3349 error ("no class template named %q#T in %q#T", name, context);
3350 return error_mark_node;
3354 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3356 if (complain & tf_error)
3358 error ("template parameters do not match template");
3359 error ("%q+D declared here", tmpl);
3361 return error_mark_node;
3364 if (complain & tf_error)
3365 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3370 /* Build the UNBOUND_CLASS_TEMPLATE. */
3371 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3372 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3373 TREE_TYPE (t) = NULL_TREE;
3374 SET_TYPE_STRUCTURAL_EQUALITY (t);
3376 /* Build the corresponding TEMPLATE_DECL. */
3377 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3378 TYPE_NAME (TREE_TYPE (d)) = d;
3379 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3380 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3381 DECL_ARTIFICIAL (d) = 1;
3382 DECL_TEMPLATE_PARMS (d) = parm_list;
3389 /* Push the declarations of builtin types into the namespace.
3390 RID_INDEX is the index of the builtin type in the array
3391 RID_POINTERS. NAME is the name used when looking up the builtin
3392 type. TYPE is the _TYPE node for the builtin type. */
3395 record_builtin_type (enum rid rid_index,
3399 tree rname = NULL_TREE, tname = NULL_TREE;
3400 tree tdecl = NULL_TREE;
3402 if ((int) rid_index < (int) RID_MAX)
3403 rname = ridpointers[(int) rid_index];
3405 tname = get_identifier (name);
3407 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3408 eliminated. Built-in types should not be looked up name; their
3409 names are keywords that the parser can recognize. However, there
3410 is code in c-common.c that uses identifier_global_value to look
3411 up built-in types by name. */
3414 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3415 DECL_ARTIFICIAL (tdecl) = 1;
3416 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3422 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3423 DECL_ARTIFICIAL (tdecl) = 1;
3425 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3428 if (!TYPE_NAME (type))
3429 TYPE_NAME (type) = tdecl;
3432 debug_hooks->type_decl (tdecl, 0);
3435 /* Record one of the standard Java types.
3436 * Declare it as having the given NAME.
3437 * If SIZE > 0, it is the size of one of the integral types;
3438 * otherwise it is the negative of the size of one of the other types. */
3441 record_builtin_java_type (const char* name, int size)
3446 type = build_nonstandard_integer_type (size, 0);
3447 type = build_distinct_type_copy (type);
3449 else if (size > -32)
3452 /* "__java_char" or ""__java_boolean". */
3453 type = build_nonstandard_integer_type (-size, 1);
3454 type = build_distinct_type_copy (type);
3455 /* Get the signed type cached and attached to the unsigned type,
3456 so it doesn't get garbage-collected at "random" times,
3457 causing potential codegen differences out of different UIDs
3458 and different alias set numbers. */
3459 stype = build_nonstandard_integer_type (-size, 0);
3460 stype = build_distinct_type_copy (stype);
3461 TREE_CHAIN (type) = stype;
3462 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3465 { /* "__java_float" or ""__java_double". */
3466 type = make_node (REAL_TYPE);
3467 TYPE_PRECISION (type) = - size;
3470 record_builtin_type (RID_MAX, name, type);
3471 decl = TYPE_NAME (type);
3473 /* Suppress generate debug symbol entries for these types,
3474 since for normal C++ they are just clutter.
3475 However, push_lang_context undoes this if extern "Java" is seen. */
3476 DECL_IGNORED_P (decl) = 1;
3478 TYPE_FOR_JAVA (type) = 1;
3482 /* Push a type into the namespace so that the back ends ignore it. */
3485 record_unknown_type (tree type, const char* name)
3487 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3488 TYPE_DECL, get_identifier (name), type));
3489 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3490 DECL_IGNORED_P (decl) = 1;
3491 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3492 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3493 TYPE_ALIGN (type) = 1;
3494 TYPE_USER_ALIGN (type) = 0;
3495 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3498 /* A string for which we should create an IDENTIFIER_NODE at
3501 typedef struct predefined_identifier
3503 /* The name of the identifier. */
3504 const char *const name;
3505 /* The place where the IDENTIFIER_NODE should be stored. */
3507 /* Nonzero if this is the name of a constructor or destructor. */
3508 const int ctor_or_dtor_p;
3509 } predefined_identifier;
3511 /* Create all the predefined identifiers. */
3514 initialize_predefined_identifiers (void)
3516 const predefined_identifier *pid;
3518 /* A table of identifiers to create at startup. */
3519 static const predefined_identifier predefined_identifiers[] = {
3520 { "C++", &lang_name_cplusplus, 0 },
3521 { "C", &lang_name_c, 0 },
3522 { "Java", &lang_name_java, 0 },
3523 /* Some of these names have a trailing space so that it is
3524 impossible for them to conflict with names written by users. */
3525 { "__ct ", &ctor_identifier, 1 },
3526 { "__base_ctor ", &base_ctor_identifier, 1 },
3527 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3528 { "__dt ", &dtor_identifier, 1 },
3529 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3530 { "__base_dtor ", &base_dtor_identifier, 1 },
3531 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3532 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3533 { "nelts", &nelts_identifier, 0 },
3534 { THIS_NAME, &this_identifier, 0 },
3535 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3536 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3537 { "_vptr", &vptr_identifier, 0 },
3538 { "__vtt_parm", &vtt_parm_identifier, 0 },
3539 { "::", &global_scope_name, 0 },
3540 { "std", &std_identifier, 0 },
3544 for (pid = predefined_identifiers; pid->name; ++pid)
3546 *pid->node = get_identifier (pid->name);
3547 if (pid->ctor_or_dtor_p)
3548 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3552 /* Create the predefined scalar types of C,
3553 and some nodes representing standard constants (0, 1, (void *)0).
3554 Initialize the global binding level.
3555 Make definitions for built-in primitive functions. */
3558 cxx_init_decl_processing (void)
3561 tree void_ftype_ptr;
3563 /* Create all the identifiers we need. */
3564 initialize_predefined_identifiers ();
3566 /* Create the global variables. */
3567 push_to_top_level ();
3569 current_function_decl = NULL_TREE;
3570 current_binding_level = NULL;
3571 /* Enter the global namespace. */
3572 gcc_assert (global_namespace == NULL_TREE);
3573 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3575 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3576 TREE_PUBLIC (global_namespace) = 1;
3577 begin_scope (sk_namespace, global_namespace);
3579 if (flag_visibility_ms_compat)
3580 default_visibility = VISIBILITY_HIDDEN;
3583 current_lang_name = lang_name_c;
3585 /* Create the `std' namespace. */
3586 push_namespace (std_identifier);
3587 std_node = current_namespace;
3590 c_common_nodes_and_builtins ();
3592 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3593 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3594 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3595 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3596 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3597 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3598 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3599 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3601 integer_two_node = build_int_cst (NULL_TREE, 2);
3603 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3604 truthvalue_type_node = boolean_type_node;
3605 truthvalue_false_node = boolean_false_node;
3606 truthvalue_true_node = boolean_true_node;
3608 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3609 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3610 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3613 record_builtin_type (RID_MAX, NULL, string_type_node);
3616 delta_type_node = ptrdiff_type_node;
3617 vtable_index_type = ptrdiff_type_node;
3619 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3620 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3621 void_ftype_ptr = build_function_type_list (void_type_node,
3622 ptr_type_node, NULL_TREE);
3624 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3626 /* C++ extensions */
3628 unknown_type_node = make_node (LANG_TYPE);
3629 record_unknown_type (unknown_type_node, "unknown type");
3631 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3632 TREE_TYPE (unknown_type_node) = unknown_type_node;
3634 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3636 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3637 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3639 init_list_type_node = make_node (LANG_TYPE);
3640 record_unknown_type (init_list_type_node, "init list");
3642 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3643 record_unknown_type (dependent_lambda_return_type_node,
3644 "undeduced lambda return type");
3647 /* Make sure we get a unique function type, so we can give
3648 its pointer type a name. (This wins for gdb.) */
3649 tree vfunc_type = make_node (FUNCTION_TYPE);
3650 TREE_TYPE (vfunc_type) = integer_type_node;
3651 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3652 layout_type (vfunc_type);
3654 vtable_entry_type = build_pointer_type (vfunc_type);
3656 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3659 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3660 layout_type (vtbl_type_node);
3661 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3662 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3663 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3664 layout_type (vtbl_ptr_type_node);
3665 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3667 push_namespace (get_identifier ("__cxxabiv1"));
3668 abi_node = current_namespace;
3671 global_type_node = make_node (LANG_TYPE);
3672 record_unknown_type (global_type_node, "global type");
3675 current_lang_name = lang_name_cplusplus;
3678 tree newattrs, extvisattr;
3679 tree newtype, deltype;
3680 tree ptr_ftype_sizetype;
3684 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3685 if (cxx_dialect == cxx98)
3688 tree bad_alloc_type_node;
3689 tree bad_alloc_decl;
3691 push_namespace (std_identifier);
3692 bad_alloc_id = get_identifier ("bad_alloc");
3693 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3694 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3696 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3697 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3701 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3704 new_eh_spec = noexcept_false_spec;
3706 /* Ensure attribs.c is initialized. */
3708 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3710 newattrs = tree_cons (get_identifier ("alloc_size"),
3711 build_tree_list (NULL_TREE, integer_one_node),
3713 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3714 newtype = build_exception_variant (newtype, new_eh_spec);
3715 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3716 deltype = build_exception_variant (deltype, empty_except_spec);
3717 push_cp_library_fn (NEW_EXPR, newtype);
3718 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3719 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3720 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3722 nullptr_type_node = make_node (NULLPTR_TYPE);
3723 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3724 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3725 TYPE_UNSIGNED (nullptr_type_node) = 1;
3726 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3727 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3728 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3729 nullptr_node = build_int_cst (nullptr_type_node, 0);
3733 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3735 /* Perform other language dependent initializations. */
3736 init_class_processing ();
3737 init_rtti_processing ();
3738 init_template_processing ();
3740 if (flag_exceptions)
3741 init_exception_processing ();
3743 if (! supports_one_only ())
3746 make_fname_decl = cp_make_fname_decl;
3747 start_fname_decls ();
3749 /* Show we use EH for cleanups. */
3750 if (flag_exceptions)
3751 using_eh_for_cleanups ();
3754 /* Generate an initializer for a function naming variable from
3755 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3756 filled in with the type of the init. */
3759 cp_fname_init (const char* name, tree *type_p)
3761 tree domain = NULL_TREE;
3763 tree init = NULL_TREE;
3768 length = strlen (name);
3769 domain = build_index_type (size_int (length));
3770 init = build_string (length + 1, name);
3773 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3774 type = build_cplus_array_type (type, domain);
3779 TREE_TYPE (init) = type;
3781 init = error_mark_node;
3786 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3787 the decl, LOC is the location to give the decl, NAME is the
3788 initialization string and TYPE_DEP indicates whether NAME depended
3789 on the type of the function. We make use of that to detect
3790 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3791 at the point of first use, so we mustn't push the decl now. */
3794 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3796 const char *const name = (type_dep && processing_template_decl
3797 ? NULL : fname_as_string (type_dep));
3799 tree init = cp_fname_init (name, &type);
3800 tree decl = build_decl (loc, VAR_DECL, id, type);
3803 free (CONST_CAST (char *, name));
3805 /* As we're using pushdecl_with_scope, we must set the context. */
3806 DECL_CONTEXT (decl) = current_function_decl;
3807 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3809 TREE_STATIC (decl) = 1;
3810 TREE_READONLY (decl) = 1;
3811 DECL_ARTIFICIAL (decl) = 1;
3813 TREE_USED (decl) = 1;
3815 if (current_function_decl)
3817 cp_binding_level *b = current_binding_level;
3818 if (b->kind == sk_function_parms)
3819 return error_mark_node;
3820 while (b->level_chain->kind != sk_function_parms)
3822 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3823 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3824 LOOKUP_ONLYCONVERTING);
3828 DECL_THIS_STATIC (decl) = true;
3829 pushdecl_top_level_and_finish (decl, init);
3836 builtin_function_1 (tree decl, tree context, bool is_global)
3838 tree id = DECL_NAME (decl);
3839 const char *name = IDENTIFIER_POINTER (id);
3841 retrofit_lang_decl (decl);
3843 DECL_ARTIFICIAL (decl) = 1;
3844 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3845 SET_DECL_LANGUAGE (decl, lang_c);
3846 /* Runtime library routines are, by definition, available in an
3847 external shared object. */
3848 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3849 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3851 DECL_CONTEXT (decl) = context;
3854 pushdecl_top_level (decl);
3858 /* A function in the user's namespace should have an explicit
3859 declaration before it is used. Mark the built-in function as
3860 anticipated but not actually declared. */
3861 if (name[0] != '_' || name[1] != '_')
3862 DECL_ANTICIPATED (decl) = 1;
3863 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3865 size_t len = strlen (name);
3867 /* Treat __*_chk fortification functions as anticipated as well,
3868 unless they are __builtin_*. */
3869 if (len > strlen ("___chk")
3870 && memcmp (name + len - strlen ("_chk"),
3871 "_chk", strlen ("_chk") + 1) == 0)
3872 DECL_ANTICIPATED (decl) = 1;
3879 cxx_builtin_function (tree decl)
3881 tree id = DECL_NAME (decl);
3882 const char *name = IDENTIFIER_POINTER (id);
3883 /* All builtins that don't begin with an '_' should additionally
3884 go in the 'std' namespace. */
3887 tree decl2 = copy_node(decl);
3888 push_namespace (std_identifier);
3889 builtin_function_1 (decl2, std_node, false);
3893 return builtin_function_1 (decl, NULL_TREE, false);
3896 /* Like cxx_builtin_function, but guarantee the function is added to the global
3897 scope. This is to allow function specific options to add new machine
3898 dependent builtins when the target ISA changes via attribute((target(...)))
3899 which saves space on program startup if the program does not use non-generic
3903 cxx_builtin_function_ext_scope (tree decl)
3906 tree id = DECL_NAME (decl);
3907 const char *name = IDENTIFIER_POINTER (id);
3908 /* All builtins that don't begin with an '_' should additionally
3909 go in the 'std' namespace. */
3912 tree decl2 = copy_node(decl);
3913 push_namespace (std_identifier);
3914 builtin_function_1 (decl2, std_node, true);
3918 return builtin_function_1 (decl, NULL_TREE, true);
3921 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3922 function. Not called directly. */
3925 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3927 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3928 DECL_EXTERNAL (fn) = 1;
3929 TREE_PUBLIC (fn) = 1;
3930 DECL_ARTIFICIAL (fn) = 1;
3931 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3932 SET_DECL_LANGUAGE (fn, lang_c);
3933 /* Runtime library routines are, by definition, available in an
3934 external shared object. */
3935 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3936 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3940 /* Returns the _DECL for a library function with C linkage.
3941 We assume that such functions never throw; if this is incorrect,
3942 callers should unset TREE_NOTHROW. */
3945 build_library_fn (tree name, tree type)
3947 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3948 TREE_NOTHROW (fn) = 1;
3952 /* Returns the _DECL for a library function with C++ linkage. */
3955 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3957 tree fn = build_library_fn_1 (name, operator_code, type);
3958 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3959 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3960 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3964 /* Like build_library_fn, but takes a C string instead of an
3968 build_library_fn_ptr (const char* name, tree type)
3970 return build_library_fn (get_identifier (name), type);
3973 /* Like build_cp_library_fn, but takes a C string instead of an
3977 build_cp_library_fn_ptr (const char* name, tree type)
3979 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3982 /* Like build_library_fn, but also pushes the function so that we will
3983 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3984 may throw exceptions listed in RAISES. */
3987 push_library_fn (tree name, tree type, tree raises)
3992 type = build_exception_variant (type, raises);
3994 fn = build_library_fn (name, type);
3995 pushdecl_top_level (fn);
3999 /* Like build_cp_library_fn, but also pushes the function so that it
4000 will be found by normal lookup. */
4003 push_cp_library_fn (enum tree_code operator_code, tree type)
4005 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4010 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4014 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4018 push_void_library_fn (tree name, tree parmtypes)
4020 tree type = build_function_type (void_type_node, parmtypes);
4021 return push_library_fn (name, type, NULL_TREE);
4024 /* Like push_library_fn, but also note that this function throws
4025 and does not return. Used for __throw_foo and the like. */
4028 push_throw_library_fn (tree name, tree type)
4030 tree fn = push_library_fn (name, type, NULL_TREE);
4031 TREE_THIS_VOLATILE (fn) = 1;
4032 TREE_NOTHROW (fn) = 0;
4036 /* When we call finish_struct for an anonymous union, we create
4037 default copy constructors and such. But, an anonymous union
4038 shouldn't have such things; this function undoes the damage to the
4039 anonymous union type T.
4041 (The reason that we create the synthesized methods is that we don't
4042 distinguish `union { int i; }' from `typedef union { int i; } U'.
4043 The first is an anonymous union; the second is just an ordinary
4047 fixup_anonymous_aggr (tree t)
4051 /* Wipe out memory of synthesized methods. */
4052 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4053 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4054 TYPE_HAS_COPY_CTOR (t) = 0;
4055 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4056 TYPE_HAS_COPY_ASSIGN (t) = 0;
4057 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4059 /* Splice the implicitly generated functions out of the TYPE_METHODS
4061 q = &TYPE_METHODS (t);
4064 if (DECL_ARTIFICIAL (*q))
4065 *q = TREE_CHAIN (*q);
4067 q = &DECL_CHAIN (*q);
4070 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4071 if (TYPE_METHODS (t))
4073 tree decl = TYPE_MAIN_DECL (t);
4075 if (TREE_CODE (t) != UNION_TYPE)
4076 error_at (DECL_SOURCE_LOCATION (decl),
4077 "an anonymous struct cannot have function members");
4079 error_at (DECL_SOURCE_LOCATION (decl),
4080 "an anonymous union cannot have function members");
4083 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4084 assignment operators (because they cannot have these methods themselves).
4085 For anonymous unions this is already checked because they are not allowed
4086 in any union, otherwise we have to check it. */
4087 if (TREE_CODE (t) != UNION_TYPE)
4091 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4092 if (TREE_CODE (field) == FIELD_DECL)
4094 type = TREE_TYPE (field);
4095 if (CLASS_TYPE_P (type))
4097 if (TYPE_NEEDS_CONSTRUCTING (type))
4098 error ("member %q+#D with constructor not allowed "
4099 "in anonymous aggregate", field);
4100 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4101 error ("member %q+#D with destructor not allowed "
4102 "in anonymous aggregate", field);
4103 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4104 error ("member %q+#D with copy assignment operator "
4105 "not allowed in anonymous aggregate", field);
4111 /* Make sure that a declaration with no declarator is well-formed, i.e.
4112 just declares a tagged type or anonymous union.
4114 Returns the type declared; or NULL_TREE if none. */
4117 check_tag_decl (cp_decl_specifier_seq *declspecs)
4119 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4120 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4121 /* If a class, struct, or enum type is declared by the DECLSPECS
4122 (i.e, if a class-specifier, enum-specifier, or non-typename
4123 elaborated-type-specifier appears in the DECLSPECS),
4124 DECLARED_TYPE is set to the corresponding type. */
4125 tree declared_type = NULL_TREE;
4126 bool error_p = false;
4128 if (declspecs->multiple_types_p)
4129 error ("multiple types in one declaration");
4130 else if (declspecs->redefined_builtin_type)
4132 if (!in_system_header)
4133 permerror (input_location, "redeclaration of C++ built-in type %qT",
4134 declspecs->redefined_builtin_type);
4139 && TYPE_P (declspecs->type)
4140 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4141 && MAYBE_CLASS_TYPE_P (declspecs->type))
4142 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4143 declared_type = declspecs->type;
4144 else if (declspecs->type == error_mark_node)
4146 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4147 permerror (input_location, "declaration does not declare anything");
4148 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4150 error ("%<auto%> can only be specified for variables "
4151 "or function declarations");
4152 return error_mark_node;
4154 /* Check for an anonymous union. */
4155 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4156 && TYPE_ANONYMOUS_P (declared_type))
4158 /* 7/3 In a simple-declaration, the optional init-declarator-list
4159 can be omitted only when declaring a class (clause 9) or
4160 enumeration (7.2), that is, when the decl-specifier-seq contains
4161 either a class-specifier, an elaborated-type-specifier with
4162 a class-key (9.1), or an enum-specifier. In these cases and
4163 whenever a class-specifier or enum-specifier is present in the
4164 decl-specifier-seq, the identifiers in these specifiers are among
4165 the names being declared by the declaration (as class-name,
4166 enum-names, or enumerators, depending on the syntax). In such
4167 cases, and except for the declaration of an unnamed bit-field (9.6),
4168 the decl-specifier-seq shall introduce one or more names into the
4169 program, or shall redeclare a name introduced by a previous
4170 declaration. [Example:
4171 enum { }; // ill-formed
4172 typedef class { }; // ill-formed
4176 error ("missing type-name in typedef-declaration");
4179 /* Anonymous unions are objects, so they can have specifiers. */;
4180 SET_ANON_AGGR_TYPE_P (declared_type);
4182 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4183 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4188 if (declspecs->specs[(int)ds_inline]
4189 || declspecs->specs[(int)ds_virtual])
4190 error ("%qs can only be specified for functions",
4191 declspecs->specs[(int)ds_inline]
4192 ? "inline" : "virtual");
4194 && (!current_class_type
4195 || current_scope () != current_class_type))
4196 error ("%<friend%> can only be specified inside a class");
4197 else if (declspecs->specs[(int)ds_explicit])
4198 error ("%<explicit%> can only be specified for constructors");
4199 else if (declspecs->storage_class)
4200 error ("a storage class can only be specified for objects "
4202 else if (declspecs->specs[(int)ds_const]
4203 || declspecs->specs[(int)ds_volatile]
4204 || declspecs->specs[(int)ds_restrict]
4205 || declspecs->specs[(int)ds_thread])
4206 error ("qualifiers can only be specified for objects "
4208 else if (saw_typedef)
4209 warning (0, "%<typedef%> was ignored in this declaration");
4210 else if (declspecs->specs[(int) ds_constexpr])
4211 error ("%<constexpr%> cannot be used for type declarations");
4214 return declared_type;
4217 /* Called when a declaration is seen that contains no names to declare.
4218 If its type is a reference to a structure, union or enum inherited
4219 from a containing scope, shadow that tag name for the current scope
4220 with a forward reference.
4221 If its type defines a new named structure or union
4222 or defines an enum, it is valid but we need not do anything here.
4223 Otherwise, it is an error.
4225 C++: may have to grok the declspecs to learn about static,
4226 complain for anonymous unions.
4228 Returns the TYPE declared -- or NULL_TREE if none. */
4231 shadow_tag (cp_decl_specifier_seq *declspecs)
4233 tree t = check_tag_decl (declspecs);
4238 if (declspecs->attributes)
4240 warning (0, "attribute ignored in declaration of %q+#T", t);
4241 warning (0, "attribute for %q+#T must follow the %qs keyword",
4242 t, class_key_or_enum_as_string (t));
4246 if (maybe_process_partial_specialization (t) == error_mark_node)
4249 /* This is where the variables in an anonymous union are
4250 declared. An anonymous union declaration looks like:
4252 because there is no declarator after the union, the parser
4253 sends that declaration here. */
4254 if (ANON_AGGR_TYPE_P (t))
4256 fixup_anonymous_aggr (t);
4258 if (TYPE_FIELDS (t))
4260 tree decl = grokdeclarator (/*declarator=*/NULL,
4261 declspecs, NORMAL, 0, NULL);
4262 finish_anon_union (decl);
4269 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4272 groktypename (cp_decl_specifier_seq *type_specifiers,
4273 const cp_declarator *declarator,
4274 bool is_template_arg)
4278 enum decl_context context
4279 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4280 attrs = type_specifiers->attributes;
4281 type_specifiers->attributes = NULL_TREE;
4282 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4283 if (attrs && type != error_mark_node)
4285 if (CLASS_TYPE_P (type))
4286 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4287 "outside of definition", type);
4288 else if (MAYBE_CLASS_TYPE_P (type))
4289 /* A template type parameter or other dependent type. */
4290 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4291 "type %qT without an associated declaration", type);
4293 cplus_decl_attributes (&type, attrs, 0);
4298 /* Process a DECLARATOR for a function-scope variable declaration,
4299 namespace-scope variable declaration, or function declaration.
4300 (Function definitions go through start_function; class member
4301 declarations appearing in the body of the class go through
4302 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4303 If an error occurs, the error_mark_node is returned instead.
4305 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4306 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4307 for an explicitly defaulted function, or SD_DELETED for an explicitly
4308 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4309 implicitly initialized via a default constructor. ATTRIBUTES and
4310 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4312 The scope represented by the context of the returned DECL is pushed
4313 (if it is not the global namespace) and is assigned to
4314 *PUSHED_SCOPE_P. The caller is then responsible for calling
4315 pop_scope on *PUSHED_SCOPE_P if it is set. */
4318 start_decl (const cp_declarator *declarator,
4319 cp_decl_specifier_seq *declspecs,
4322 tree prefix_attributes,
4323 tree *pushed_scope_p)
4331 *pushed_scope_p = NULL_TREE;
4333 /* An object declared as __attribute__((deprecated)) suppresses
4334 warnings of uses of other deprecated items. */
4335 if (lookup_attribute ("deprecated", attributes))
4336 deprecated_state = DEPRECATED_SUPPRESS;
4338 attributes = chainon (attributes, prefix_attributes);
4340 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4343 deprecated_state = DEPRECATED_NORMAL;
4345 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4346 || decl == error_mark_node)
4347 return error_mark_node;
4349 context = CP_DECL_CONTEXT (decl);
4350 if (context != global_namespace)
4351 *pushed_scope_p = push_scope (context);
4354 /* Is it valid for this decl to have an initializer at all?
4355 If not, set INITIALIZED to zero, which will indirectly
4356 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4357 switch (TREE_CODE (decl))
4360 error ("typedef %qD is initialized (use decltype instead)", decl);
4361 return error_mark_node;
4364 if (initialized == SD_DELETED)
4365 /* We'll handle the rest of the semantics later, but we need to
4366 set this now so it's visible to duplicate_decls. */
4367 DECL_DELETED_FN (decl) = 1;
4376 if (! toplevel_bindings_p ()
4377 && DECL_EXTERNAL (decl))
4378 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4380 DECL_EXTERNAL (decl) = 0;
4381 if (toplevel_bindings_p ())
4382 TREE_STATIC (decl) = 1;
4384 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4386 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4387 record_key_method_defined (decl);
4389 /* If this is a typedef that names the class for linkage purposes
4390 (7.1.3p8), apply any attributes directly to the type. */
4391 if (TREE_CODE (decl) == TYPE_DECL
4392 && TAGGED_TYPE_P (TREE_TYPE (decl))
4393 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4394 flags = ATTR_FLAG_TYPE_IN_PLACE;
4398 /* Set attributes here so if duplicate decl, will have proper attributes. */
4399 cplus_decl_attributes (&decl, attributes, flags);
4401 /* Dllimported symbols cannot be defined. Static data members (which
4402 can be initialized in-class and dllimported) go through grokfield,
4403 not here, so we don't need to exclude those decls when checking for
4405 if (initialized && DECL_DLLIMPORT_P (decl))
4407 error ("definition of %q#D is marked %<dllimport%>", decl);
4408 DECL_DLLIMPORT_P (decl) = 0;
4411 /* If #pragma weak was used, mark the decl weak now. */
4412 maybe_apply_pragma_weak (decl);
4414 if (TREE_CODE (decl) == FUNCTION_DECL
4415 && DECL_DECLARED_INLINE_P (decl)
4416 && DECL_UNINLINABLE (decl)
4417 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4418 warning (0, "inline function %q+D given attribute noinline", decl);
4420 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4422 if (TREE_CODE (decl) == VAR_DECL)
4424 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4425 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4426 error ("%q#D is not a static member of %q#T", decl, context);
4429 if (DECL_CONTEXT (field) != context)
4431 if (!same_type_p (DECL_CONTEXT (field), context))
4432 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4433 "to be defined as %<%T::%D%>",
4434 DECL_CONTEXT (field), DECL_NAME (decl),
4435 context, DECL_NAME (decl));
4436 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4438 if (processing_specialization
4439 && template_class_depth (context) == 0
4440 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4441 error ("template header not allowed in member definition "
4442 "of explicitly specialized class");
4443 /* Static data member are tricky; an in-class initialization
4444 still doesn't provide a definition, so the in-class
4445 declaration will have DECL_EXTERNAL set, but will have an
4446 initialization. Thus, duplicate_decls won't warn
4447 about this situation, and so we check here. */
4448 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4449 error ("duplicate initialization of %qD", decl);
4450 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4452 if (declspecs->specs[(int) ds_constexpr]
4453 && !DECL_DECLARED_CONSTEXPR_P (field))
4454 error ("%qD declared %<constexpr%> outside its class", field);
4459 tree field = check_classfn (context, decl,
4460 (processing_template_decl
4461 > template_class_depth (context))
4462 ? current_template_parms
4464 if (field && field != error_mark_node
4465 && duplicate_decls (decl, field,
4466 /*newdecl_is_friend=*/false))
4470 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4471 DECL_IN_AGGR_P (decl) = 0;
4472 /* Do not mark DECL as an explicit specialization if it was not
4473 already marked as an instantiation; a declaration should
4474 never be marked as a specialization unless we know what
4475 template is being specialized. */
4476 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4478 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4480 /* [temp.expl.spec] An explicit specialization of a static data
4481 member of a template is a definition if the declaration
4482 includes an initializer; otherwise, it is a declaration.
4484 We check for processing_specialization so this only applies
4485 to the new specialization syntax. */
4486 if (!initialized && processing_specialization)
4487 DECL_EXTERNAL (decl) = 1;
4490 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4491 /* Aliases are definitions. */
4493 permerror (input_location, "declaration of %q#D outside of class is not definition",
4497 was_public = TREE_PUBLIC (decl);
4499 /* Enter this declaration into the symbol table. */
4500 decl = maybe_push_decl (decl);
4502 if (processing_template_decl)
4503 decl = push_template_decl (decl);
4504 if (decl == error_mark_node)
4505 return error_mark_node;
4507 /* Tell the back end to use or not use .common as appropriate. If we say
4508 -fconserve-space, we want this to save .data space, at the expense of
4509 wrong semantics. If we say -fno-conserve-space, we want this to
4510 produce errors about redefs; to do this we force variables into the
4512 if (flag_conserve_space
4513 && TREE_CODE (decl) == VAR_DECL
4514 && TREE_PUBLIC (decl)
4515 && !DECL_THREAD_LOCAL_P (decl)
4516 && !have_global_bss_p ())
4517 DECL_COMMON (decl) = 1;
4519 if (TREE_CODE (decl) == VAR_DECL
4520 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4521 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4523 /* This is a const variable with implicit 'static'. Set
4524 DECL_THIS_STATIC so we can tell it from variables that are
4525 !TREE_PUBLIC because of the anonymous namespace. */
4526 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4527 DECL_THIS_STATIC (decl) = 1;
4530 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4531 start_decl_1 (decl, initialized);
4536 /* Process the declaration of a variable DECL. INITIALIZED is true
4537 iff DECL is explicitly initialized. (INITIALIZED is false if the
4538 variable is initialized via an implicitly-called constructor.)
4539 This function must be called for ordinary variables (including, for
4540 example, implicit instantiations of templates), but must not be
4541 called for template declarations. */
4544 start_decl_1 (tree decl, bool initialized)
4548 bool aggregate_definition_p;
4550 gcc_assert (!processing_template_decl);
4552 if (error_operand_p (decl))
4555 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4557 type = TREE_TYPE (decl);
4558 complete_p = COMPLETE_TYPE_P (type);
4559 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4561 /* If an explicit initializer is present, or if this is a definition
4562 of an aggregate, then we need a complete type at this point.
4563 (Scalars are always complete types, so there is nothing to
4564 check.) This code just sets COMPLETE_P; errors (if necessary)
4565 are issued below. */
4566 if ((initialized || aggregate_definition_p)
4568 && COMPLETE_TYPE_P (complete_type (type)))
4571 /* We will not yet have set TREE_READONLY on DECL if the type
4572 was "const", but incomplete, before this point. But, now, we
4573 have a complete type, so we can try again. */
4574 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4578 /* Is it valid for this decl to have an initializer at all? */
4580 /* Don't allow initializations for incomplete types except for
4581 arrays which might be completed by the initialization. */
4583 ; /* A complete type is ok. */
4584 else if (type_uses_auto (type))
4585 ; /* An auto type is ok. */
4586 else if (TREE_CODE (type) != ARRAY_TYPE)
4588 error ("variable %q#D has initializer but incomplete type", decl);
4589 type = TREE_TYPE (decl) = error_mark_node;
4591 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4593 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4594 error ("elements of array %q#D have incomplete type", decl);
4595 /* else we already gave an error in start_decl. */
4598 else if (aggregate_definition_p && !complete_p)
4600 if (type_uses_auto (type))
4601 error ("declaration of %q#D has no initializer", decl);
4603 error ("aggregate %q#D has incomplete type and cannot be defined",
4605 /* Change the type so that assemble_variable will give
4606 DECL an rtl we can live with: (mem (const_int 0)). */
4607 type = TREE_TYPE (decl) = error_mark_node;
4610 /* Create a new scope to hold this declaration if necessary.
4611 Whether or not a new scope is necessary cannot be determined
4612 until after the type has been completed; if the type is a
4613 specialization of a class template it is not until after
4614 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4615 will be set correctly. */
4616 maybe_push_cleanup_level (type);
4619 /* Handle initialization of references. DECL, TYPE, and INIT have the
4620 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4621 but will be set to a new CLEANUP_STMT if a temporary is created
4622 that must be destroyed subsequently.
4624 Returns an initializer expression to use to initialize DECL, or
4625 NULL if the initialization can be performed statically.
4627 Quotes on semantics can be found in ARM 8.4.3. */
4630 grok_reference_init (tree decl, tree type, tree init, int flags)
4632 if (init == NULL_TREE)
4634 if ((DECL_LANG_SPECIFIC (decl) == 0
4635 || DECL_IN_AGGR_P (decl) == 0)
4636 && ! DECL_THIS_EXTERN (decl))
4637 error ("%qD declared as reference but not initialized", decl);
4641 if (TREE_CODE (init) == TREE_LIST)
4642 init = build_x_compound_expr_from_list (init, ELK_INIT,
4643 tf_warning_or_error);
4645 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4646 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4647 /* Note: default conversion is only called in very special cases. */
4648 init = decay_conversion (init);
4650 /* Convert INIT to the reference type TYPE. This may involve the
4651 creation of a temporary, whose lifetime must be the same as that
4652 of the reference. If so, a DECL_EXPR for the temporary will be
4653 added just after the DECL_EXPR for DECL. That's why we don't set
4654 DECL_INITIAL for local references (instead assigning to them
4655 explicitly); we need to allow the temporary to be initialized
4657 return initialize_reference (type, init, flags,
4658 tf_warning_or_error);
4661 /* Designated initializers in arrays are not supported in GNU C++.
4662 The parser cannot detect this error since it does not know whether
4663 a given brace-enclosed initializer is for a class type or for an
4664 array. This function checks that CE does not use a designated
4665 initializer. If it does, an error is issued. Returns true if CE
4666 is valid, i.e., does not have a designated initializer. */
4669 check_array_designated_initializer (const constructor_elt *ce,
4670 unsigned HOST_WIDE_INT index)
4672 /* Designated initializers for array elements are not supported. */
4675 /* The parser only allows identifiers as designated
4677 if (ce->index == error_mark_node)
4678 error ("name used in a GNU-style designated "
4679 "initializer for an array");
4680 else if (TREE_CODE (ce->index) == INTEGER_CST)
4682 /* A C99 designator is OK if it matches the current index. */
4683 if (TREE_INT_CST_LOW (ce->index) == index)
4686 sorry ("non-trivial designated initializers not supported");
4690 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4691 error ("name %qD used in a GNU-style designated "
4692 "initializer for an array", ce->index);
4700 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4701 array until we finish parsing the initializer. If that's the
4702 situation we're in, update DECL accordingly. */
4705 maybe_deduce_size_from_array_init (tree decl, tree init)
4707 tree type = TREE_TYPE (decl);
4709 if (TREE_CODE (type) == ARRAY_TYPE
4710 && TYPE_DOMAIN (type) == NULL_TREE
4711 && TREE_CODE (decl) != TYPE_DECL)
4713 /* do_default is really a C-ism to deal with tentative definitions.
4714 But let's leave it here to ease the eventual merge. */
4715 int do_default = !DECL_EXTERNAL (decl);
4716 tree initializer = init ? init : DECL_INITIAL (decl);
4719 /* Check that there are no designated initializers in INIT, as
4720 those are not supported in GNU C++, and as the middle-end
4721 will crash if presented with a non-numeric designated
4723 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4725 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4726 constructor_elt *ce;
4728 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4729 if (!check_array_designated_initializer (ce, i))
4735 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4739 error ("initializer fails to determine size of %qD", decl);
4740 TREE_TYPE (decl) = error_mark_node;
4742 else if (failure == 2)
4746 error ("array size missing in %qD", decl);
4747 TREE_TYPE (decl) = error_mark_node;
4749 /* If a `static' var's size isn't known, make it extern as
4750 well as static, so it does not get allocated. If it's not
4751 `static', then don't mark it extern; finish_incomplete_decl
4752 will give it a default size and it will get allocated. */
4753 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4754 DECL_EXTERNAL (decl) = 1;
4756 else if (failure == 3)
4758 error ("zero-size array %qD", decl);
4759 TREE_TYPE (decl) = error_mark_node;
4763 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4765 relayout_decl (decl);
4769 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4770 any appropriate error messages regarding the layout. */
4773 layout_var_decl (tree decl)
4777 type = TREE_TYPE (decl);
4778 if (type == error_mark_node)
4781 /* If we haven't already layed out this declaration, do so now.
4782 Note that we must not call complete type for an external object
4783 because it's type might involve templates that we are not
4784 supposed to instantiate yet. (And it's perfectly valid to say
4785 `extern X x' for some incomplete type `X'.) */
4786 if (!DECL_EXTERNAL (decl))
4787 complete_type (type);
4788 if (!DECL_SIZE (decl)
4789 && TREE_TYPE (decl) != error_mark_node
4790 && (COMPLETE_TYPE_P (type)
4791 || (TREE_CODE (type) == ARRAY_TYPE
4792 && !TYPE_DOMAIN (type)
4793 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4794 layout_decl (decl, 0);
4796 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4798 /* An automatic variable with an incomplete type: that is an error.
4799 Don't talk about array types here, since we took care of that
4800 message in grokdeclarator. */
4801 error ("storage size of %qD isn%'t known", decl);
4802 TREE_TYPE (decl) = error_mark_node;
4805 /* Keep this code around in case we later want to control debug info
4806 based on whether a type is "used". (jason 1999-11-11) */
4808 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4809 /* Let debugger know it should output info for this type. */
4810 note_debug_info_needed (ttype);
4812 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4813 note_debug_info_needed (DECL_CONTEXT (decl));
4816 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4817 && DECL_SIZE (decl) != NULL_TREE
4818 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4820 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4821 constant_expression_warning (DECL_SIZE (decl));
4824 error ("storage size of %qD isn%'t constant", decl);
4825 TREE_TYPE (decl) = error_mark_node;
4830 /* If a local static variable is declared in an inline function, or if
4831 we have a weak definition, we must endeavor to create only one
4832 instance of the variable at link-time. */
4835 maybe_commonize_var (tree decl)
4837 /* Static data in a function with comdat linkage also has comdat
4839 if (TREE_STATIC (decl)
4840 /* Don't mess with __FUNCTION__. */
4841 && ! DECL_ARTIFICIAL (decl)
4842 && DECL_FUNCTION_SCOPE_P (decl)
4843 && vague_linkage_p (DECL_CONTEXT (decl)))
4847 /* With weak symbols, we simply make the variable COMDAT;
4848 that will cause copies in multiple translations units to
4850 comdat_linkage (decl);
4854 if (DECL_INITIAL (decl) == NULL_TREE
4855 || DECL_INITIAL (decl) == error_mark_node)
4857 /* Without weak symbols, we can use COMMON to merge
4858 uninitialized variables. */
4859 TREE_PUBLIC (decl) = 1;
4860 DECL_COMMON (decl) = 1;
4864 /* While for initialized variables, we must use internal
4865 linkage -- which means that multiple copies will not
4867 TREE_PUBLIC (decl) = 0;
4868 DECL_COMMON (decl) = 0;
4869 warning_at (input_location, 0,
4870 "sorry: semantics of inline function static "
4871 "data %q+#D are wrong (you%'ll wind up "
4872 "with multiple copies)", decl);
4873 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4874 " you can work around this by removing "
4879 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4880 /* Set it up again; we might have set DECL_INITIAL since the last
4882 comdat_linkage (decl);
4885 /* Issue an error message if DECL is an uninitialized const variable. */
4888 check_for_uninitialized_const_var (tree decl)
4890 tree type = strip_array_types (TREE_TYPE (decl));
4892 /* ``Unless explicitly declared extern, a const object does not have
4893 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4895 if (TREE_CODE (decl) == VAR_DECL
4896 && TREE_CODE (type) != REFERENCE_TYPE
4897 && CP_TYPE_CONST_P (type)
4898 && !DECL_INITIAL (decl))
4900 tree field = default_init_uninitialized_part (type);
4904 permerror (DECL_SOURCE_LOCATION (decl),
4905 "uninitialized const %qD", decl);
4907 if (CLASS_TYPE_P (type))
4909 tree defaulted_ctor;
4911 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4912 "%q#T has no user-provided default constructor", type);
4913 defaulted_ctor = in_class_defaulted_default_constructor (type);
4915 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4916 "constructor is not user-provided because it is "
4917 "explicitly defaulted in the class body");
4918 inform (0, "and the implicitly-defined constructor does not "
4919 "initialize %q+#D", field);
4924 /* Structure holding the current initializer being processed by reshape_init.
4925 CUR is a pointer to the current element being processed, END is a pointer
4926 after the last element present in the initializer. */
4927 typedef struct reshape_iterator_t
4929 constructor_elt *cur;
4930 constructor_elt *end;
4933 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4935 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4936 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4937 initialized. If there are no more such fields, the return value
4941 next_initializable_field (tree field)
4944 && (TREE_CODE (field) != FIELD_DECL
4945 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4946 || DECL_ARTIFICIAL (field)))
4947 field = DECL_CHAIN (field);
4952 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4953 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4954 INTEGER_CST representing the size of the array minus one (the maximum index),
4955 or NULL_TREE if the array was declared without specifying the size. D is
4956 the iterator within the constructor. */
4959 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4960 tsubst_flags_t complain)
4963 bool sized_array_p = (max_index != NULL_TREE);
4964 unsigned HOST_WIDE_INT max_index_cst = 0;
4965 unsigned HOST_WIDE_INT index;
4967 /* The initializer for an array is always a CONSTRUCTOR. */
4968 new_init = build_constructor (init_list_type_node, NULL);
4972 /* Minus 1 is used for zero sized arrays. */
4973 if (integer_all_onesp (max_index))
4976 if (host_integerp (max_index, 1))
4977 max_index_cst = tree_low_cst (max_index, 1);
4978 /* sizetype is sign extended, not zero extended. */
4980 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4984 /* Loop until there are no more initializers. */
4986 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4991 check_array_designated_initializer (d->cur, index);
4992 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4994 if (elt_init == error_mark_node)
4995 return error_mark_node;
4996 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4997 size_int (index), elt_init);
4998 if (!TREE_CONSTANT (elt_init))
4999 TREE_CONSTANT (new_init) = false;
5005 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5006 Parameters are the same of reshape_init_r. */
5009 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5011 tree max_index = NULL_TREE;
5013 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5015 if (TYPE_DOMAIN (type))
5016 max_index = array_type_nelts (type);
5018 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5021 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5022 Parameters are the same of reshape_init_r. */
5025 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5027 tree max_index = NULL_TREE;
5029 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5031 if (COMPOUND_LITERAL_P (d->cur->value))
5033 tree value = d->cur->value;
5034 if (!same_type_p (TREE_TYPE (value), type))
5036 if (complain & tf_error)
5037 error ("invalid type %qT as initializer for a vector of type %qT",
5038 TREE_TYPE (d->cur->value), type);
5039 value = error_mark_node;
5045 /* For a vector, we initialize it as an array of the appropriate size. */
5046 if (TREE_CODE (type) == VECTOR_TYPE)
5047 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5049 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5052 /* Subroutine of reshape_init_r, processes the initializers for classes
5053 or union. Parameters are the same of reshape_init_r. */
5056 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5057 tsubst_flags_t complain)
5062 gcc_assert (CLASS_TYPE_P (type));
5064 /* The initializer for a class is always a CONSTRUCTOR. */
5065 new_init = build_constructor (init_list_type_node, NULL);
5066 field = next_initializable_field (TYPE_FIELDS (type));
5072 An initializer for an aggregate member that is an
5073 empty class shall have the form of an empty
5074 initializer-list {}. */
5075 if (!first_initializer_p)
5077 if (complain & tf_error)
5078 error ("initializer for %qT must be brace-enclosed", type);
5079 return error_mark_node;
5084 /* Loop through the initializable fields, gathering initializers. */
5085 while (d->cur != d->end)
5089 /* Handle designated initializers, as an extension. */
5092 if (TREE_CODE (d->cur->index) == INTEGER_CST)
5094 if (complain & tf_error)
5095 error ("%<[%E] =%> used in a GNU-style designated initializer"
5096 " for class %qT", d->cur->index, type);
5097 return error_mark_node;
5100 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5102 if (!field || TREE_CODE (field) != FIELD_DECL)
5104 if (complain & tf_error)
5105 error ("%qT has no non-static data member named %qD", type,
5107 return error_mark_node;
5111 /* If we processed all the member of the class, we are done. */
5115 field_init = reshape_init_r (TREE_TYPE (field), d,
5116 /*first_initializer_p=*/false, complain);
5117 if (field_init == error_mark_node)
5118 return error_mark_node;
5120 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5124 When a union is initialized with a brace-enclosed
5125 initializer, the braces shall only contain an
5126 initializer for the first member of the union. */
5127 if (TREE_CODE (type) == UNION_TYPE)
5130 field = next_initializable_field (DECL_CHAIN (field));
5136 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5137 designators are not valid; either complain or return true to indicate
5138 that reshape_init_r should return error_mark_node. */
5141 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5145 if (complain & tf_error)
5146 error ("C99 designator %qE outside aggregate initializer",
5154 /* Subroutine of reshape_init, which processes a single initializer (part of
5155 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5156 iterator within the CONSTRUCTOR which points to the initializer to process.
5157 FIRST_INITIALIZER_P is true if this is the first initializer of the
5158 outermost CONSTRUCTOR node. */
5161 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5162 tsubst_flags_t complain)
5164 tree init = d->cur->value;
5166 if (error_operand_p (init))
5167 return error_mark_node;
5169 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5170 && has_designator_problem (d, complain))
5171 return error_mark_node;
5173 if (TREE_CODE (type) == COMPLEX_TYPE)
5175 /* A complex type can be initialized from one or two initializers,
5176 but braces are not elided. */
5178 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5180 if (CONSTRUCTOR_NELTS (init) > 2)
5182 if (complain & tf_error)
5183 error ("too many initializers for %qT", type);
5185 return error_mark_node;
5188 else if (first_initializer_p && d->cur != d->end)
5190 VEC(constructor_elt, gc) *v = 0;
5191 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5192 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5193 if (has_designator_problem (d, complain))
5194 return error_mark_node;
5196 init = build_constructor (init_list_type_node, v);
5201 /* A non-aggregate type is always initialized with a single
5203 if (!CP_AGGREGATE_TYPE_P (type))
5205 /* It is invalid to initialize a non-aggregate type with a
5206 brace-enclosed initializer before C++0x.
5207 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5208 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5209 a CONSTRUCTOR (with a record type). */
5210 if (TREE_CODE (init) == CONSTRUCTOR
5211 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5213 if (SCALAR_TYPE_P (type))
5215 if (complain & tf_error)
5216 error ("braces around scalar initializer for type %qT", type);
5217 init = error_mark_node;
5220 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5229 All implicit type conversions (clause _conv_) are considered when
5230 initializing the aggregate member with an initializer from an
5231 initializer-list. If the initializer can initialize a member,
5232 the member is initialized. Otherwise, if the member is itself a
5233 non-empty subaggregate, brace elision is assumed and the
5234 initializer is considered for the initialization of the first
5235 member of the subaggregate. */
5236 if (TREE_CODE (init) != CONSTRUCTOR
5237 /* But don't try this for the first initializer, since that would be
5238 looking through the outermost braces; A a2 = { a1 }; is not a
5239 valid aggregate initialization. */
5240 && !first_initializer_p
5241 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5242 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5248 /* [dcl.init.string]
5250 A char array (whether plain char, signed char, or unsigned char)
5251 can be initialized by a string-literal (optionally enclosed in
5252 braces); a wchar_t array can be initialized by a wide
5253 string-literal (optionally enclosed in braces). */
5254 if (TREE_CODE (type) == ARRAY_TYPE
5255 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5257 tree str_init = init;
5259 /* Strip one level of braces if and only if they enclose a single
5260 element (as allowed by [dcl.init.string]). */
5261 if (!first_initializer_p
5262 && TREE_CODE (str_init) == CONSTRUCTOR
5263 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5265 str_init = VEC_index (constructor_elt,
5266 CONSTRUCTOR_ELTS (str_init), 0)->value;
5269 /* If it's a string literal, then it's the initializer for the array
5270 as a whole. Otherwise, continue with normal initialization for
5271 array types (one value per array element). */
5272 if (TREE_CODE (str_init) == STRING_CST)
5274 if (has_designator_problem (d, complain))
5275 return error_mark_node;
5281 /* The following cases are about aggregates. If we are not within a full
5282 initializer already, and there is not a CONSTRUCTOR, it means that there
5283 is a missing set of braces (that is, we are processing the case for
5284 which reshape_init exists). */
5285 if (!first_initializer_p)
5287 if (TREE_CODE (init) == CONSTRUCTOR)
5289 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5290 /* There is no need to reshape pointer-to-member function
5291 initializers, as they are always constructed correctly
5292 by the front end. */
5294 else if (COMPOUND_LITERAL_P (init))
5295 /* For a nested compound literal, there is no need to reshape since
5296 brace elision is not allowed. Even if we decided to allow it,
5297 we should add a call to reshape_init in finish_compound_literal,
5298 before calling digest_init, so changing this code would still
5299 not be necessary. */
5300 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5304 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5305 return reshape_init (type, init, complain);
5309 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5313 /* Dispatch to specialized routines. */
5314 if (CLASS_TYPE_P (type))
5315 return reshape_init_class (type, d, first_initializer_p, complain);
5316 else if (TREE_CODE (type) == ARRAY_TYPE)
5317 return reshape_init_array (type, d, complain);
5318 else if (TREE_CODE (type) == VECTOR_TYPE)
5319 return reshape_init_vector (type, d, complain);
5324 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5325 brace-enclosed aggregate initializer.
5327 INIT is the CONSTRUCTOR containing the list of initializers describing
5328 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5329 It may not presently match the shape of the TYPE; for example:
5331 struct S { int a; int b; };
5332 struct S a[] = { 1, 2, 3, 4 };
5334 Here INIT will hold a VEC of four elements, rather than a
5335 VEC of two elements, each itself a VEC of two elements. This
5336 routine transforms INIT from the former form into the latter. The
5337 revised CONSTRUCTOR node is returned. */
5340 reshape_init (tree type, tree init, tsubst_flags_t complain)
5342 VEC(constructor_elt, gc) *v;
5346 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5348 v = CONSTRUCTOR_ELTS (init);
5350 /* An empty constructor does not need reshaping, and it is always a valid
5352 if (VEC_empty (constructor_elt, v))
5355 /* Recurse on this CONSTRUCTOR. */
5356 d.cur = VEC_index (constructor_elt, v, 0);
5357 d.end = d.cur + VEC_length (constructor_elt, v);
5359 new_init = reshape_init_r (type, &d, true, complain);
5360 if (new_init == error_mark_node)
5361 return error_mark_node;
5363 /* Make sure all the element of the constructor were used. Otherwise,
5364 issue an error about exceeding initializers. */
5367 if (complain & tf_error)
5368 error ("too many initializers for %qT", type);
5370 return error_mark_node;
5376 /* Verify array initializer. Returns true if errors have been reported. */
5379 check_array_initializer (tree decl, tree type, tree init)
5381 tree element_type = TREE_TYPE (type);
5383 /* The array type itself need not be complete, because the
5384 initializer may tell us how many elements are in the array.
5385 But, the elements of the array must be complete. */
5386 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5389 error ("elements of array %q#D have incomplete type", decl);
5391 error ("elements of array %q#T have incomplete type", type);
5394 /* It is not valid to initialize a VLA. */
5396 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5397 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5400 error ("variable-sized object %qD may not be initialized", decl);
5402 error ("variable-sized compound literal");
5408 /* Subroutine of check_initializer; args are passed down from that function.
5409 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5412 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5415 gcc_assert (stmts_are_full_exprs_p ());
5416 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5419 /* Verify INIT (the initializer for DECL), and record the
5420 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5421 grok_reference_init.
5423 If the return value is non-NULL, it is an expression that must be
5424 evaluated dynamically to initialize DECL. */
5427 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5429 tree type = TREE_TYPE (decl);
5430 tree init_code = NULL;
5431 tree extra_init = NULL_TREE;
5434 /* Things that are going to be initialized need to have complete
5436 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5438 if (DECL_HAS_VALUE_EXPR_P (decl))
5440 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5441 it doesn't have storage to be initialized. */
5442 gcc_assert (init == NULL_TREE);
5446 if (type == error_mark_node)
5447 /* We will have already complained. */
5450 if (TREE_CODE (type) == ARRAY_TYPE)
5452 if (check_array_initializer (decl, type, init))
5455 else if (!COMPLETE_TYPE_P (type))
5457 error ("%q#D has incomplete type", decl);
5458 TREE_TYPE (decl) = error_mark_node;
5462 /* There is no way to make a variable-sized class type in GNU C++. */
5463 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5465 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5467 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5468 if (SCALAR_TYPE_P (type))
5472 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5473 init = build_zero_init (type, NULL_TREE, false);
5475 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5477 error ("scalar object %qD requires one element in initializer",
5479 TREE_TYPE (decl) = error_mark_node;
5485 if (TREE_CODE (decl) == CONST_DECL)
5487 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5489 DECL_INITIAL (decl) = init;
5491 gcc_assert (init != NULL_TREE);
5494 else if (!init && DECL_REALLY_EXTERN (decl))
5496 else if (init || type_build_ctor_call (type)
5497 || TREE_CODE (type) == REFERENCE_TYPE)
5499 if (TREE_CODE (type) == REFERENCE_TYPE)
5501 init = grok_reference_init (decl, type, init, flags);
5502 flags |= LOOKUP_ALREADY_DIGESTED;
5505 check_for_uninitialized_const_var (decl);
5506 /* Do not reshape constructors of vectors (they don't need to be
5508 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5510 if (is_std_init_list (type))
5512 init = perform_implicit_conversion (type, init,
5513 tf_warning_or_error);
5514 flags |= LOOKUP_ALREADY_DIGESTED;
5516 else if (TYPE_NON_AGGREGATE_CLASS (type))
5518 /* Don't reshape if the class has constructors. */
5519 if (cxx_dialect == cxx98)
5520 error ("in C++98 %qD must be initialized by constructor, "
5524 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5526 error ("opaque vector types cannot be initialized");
5527 init = error_mark_node;
5531 init = reshape_init (type, init, tf_warning_or_error);
5532 if (SCALAR_TYPE_P (type))
5533 check_narrowing (type, init);
5537 /* If DECL has an array type without a specific bound, deduce the
5538 array size from the initializer. */
5539 maybe_deduce_size_from_array_init (decl, init);
5540 type = TREE_TYPE (decl);
5541 if (type == error_mark_node)
5544 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5545 && !(flags & LOOKUP_ALREADY_DIGESTED)
5546 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5547 && CP_AGGREGATE_TYPE_P (type)))
5549 init_code = build_aggr_init_full_exprs (decl, init, flags);
5551 /* If this is a constexpr initializer, expand_default_init will
5552 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5553 case, pull the initializer back out and pass it down into
5554 store_init_value. */
5555 while (TREE_CODE (init_code) == EXPR_STMT
5556 || TREE_CODE (init_code) == CONVERT_EXPR)
5557 init_code = TREE_OPERAND (init_code, 0);
5558 if (TREE_CODE (init_code) == INIT_EXPR)
5560 init = TREE_OPERAND (init_code, 1);
5561 init_code = NULL_TREE;
5562 /* Don't call digest_init; it's unnecessary and will complain
5563 about aggregate initialization of non-aggregate classes. */
5564 flags |= LOOKUP_ALREADY_DIGESTED;
5566 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5568 /* Declared constexpr, but no suitable initializer; massage
5569 init appropriately so we can pass it into store_init_value
5571 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5572 init = finish_compound_literal (type, init,
5573 tf_warning_or_error);
5574 else if (CLASS_TYPE_P (type)
5575 && (!init || TREE_CODE (init) == TREE_LIST))
5577 init = build_functional_cast (type, init, tf_none);
5578 if (init != error_mark_node)
5579 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5581 init_code = NULL_TREE;
5587 if (init && TREE_CODE (init) != TREE_VEC)
5589 /* In aggregate initialization of a variable, each element
5590 initialization is a full-expression because there is no
5591 enclosing expression. */
5592 gcc_assert (stmts_are_full_exprs_p ());
5594 init_code = store_init_value (decl, init, cleanups, flags);
5596 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5597 && DECL_INITIAL (decl)
5598 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5599 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5600 warning (0, "array %qD initialized by parenthesized string literal %qE",
5601 decl, DECL_INITIAL (decl));
5607 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5608 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5609 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5610 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5613 check_for_uninitialized_const_var (decl);
5616 if (init && init != error_mark_node)
5617 init_code = build2 (INIT_EXPR, type, decl, init);
5620 init_code = add_stmt_to_compound (extra_init, init_code);
5622 if (init_code && DECL_IN_AGGR_P (decl))
5624 static int explained = 0;
5626 if (cxx_dialect < cxx0x)
5627 error ("initializer invalid for static member with constructor");
5629 error ("non-constant in-class initialization invalid for static "
5630 "member %qD", decl);
5633 error ("(an out of class initialization is required)");
5641 /* If DECL is not a local variable, give it RTL. */
5644 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5646 int toplev = toplevel_bindings_p ();
5648 const char *filename;
5650 /* Set the DECL_ASSEMBLER_NAME for the object. */
5653 /* The `register' keyword, when used together with an
5654 asm-specification, indicates that the variable should be
5655 placed in a particular register. */
5656 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5658 set_user_assembler_name (decl, asmspec);
5659 DECL_HARD_REGISTER (decl) = 1;
5663 if (TREE_CODE (decl) == FUNCTION_DECL
5664 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5665 set_builtin_user_assembler_name (decl, asmspec);
5666 set_user_assembler_name (decl, asmspec);
5670 /* Handle non-variables up front. */
5671 if (TREE_CODE (decl) != VAR_DECL)
5673 rest_of_decl_compilation (decl, toplev, at_eof);
5677 /* If we see a class member here, it should be a static data
5679 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5681 gcc_assert (TREE_STATIC (decl));
5682 /* An in-class declaration of a static data member should be
5683 external; it is only a declaration, and not a definition. */
5684 if (init == NULL_TREE)
5685 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5688 /* We don't create any RTL for local variables. */
5689 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5692 /* We defer emission of local statics until the corresponding
5693 DECL_EXPR is expanded. */
5694 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5696 /* We try to defer namespace-scope static constants so that they are
5697 not emitted into the object file unnecessarily. */
5698 filename = input_filename;
5699 if (!DECL_VIRTUAL_P (decl)
5700 && TREE_READONLY (decl)
5701 && DECL_INITIAL (decl) != NULL_TREE
5702 && DECL_INITIAL (decl) != error_mark_node
5704 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5706 && !TREE_PUBLIC (decl))
5708 /* Fool with the linkage of static consts according to #pragma
5710 struct c_fileinfo *finfo = get_fileinfo (filename);
5711 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5713 TREE_PUBLIC (decl) = 1;
5714 DECL_EXTERNAL (decl) = finfo->interface_only;
5719 /* Likewise for template instantiations. */
5720 else if (DECL_LANG_SPECIFIC (decl)
5721 && DECL_IMPLICIT_INSTANTIATION (decl))
5724 /* If we're not deferring, go ahead and assemble the variable. */
5726 rest_of_decl_compilation (decl, toplev, at_eof);
5729 /* walk_tree helper for wrap_temporary_cleanups, below. */
5732 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5734 /* Stop at types or full-expression boundaries. */
5735 if (TYPE_P (*stmt_p)
5736 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5742 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5744 tree guard = (tree)data;
5745 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5747 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5748 /* Tell honor_protect_cleanup_actions to handle this as a separate
5750 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5752 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5758 /* We're initializing a local variable which has a cleanup GUARD. If there
5759 are any temporaries used in the initializer INIT of this variable, we
5760 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5761 variable will be cleaned up properly if one of them throws.
5763 Unfortunately, there's no way to express this properly in terms of
5764 nesting, as the regions for the temporaries overlap the region for the
5765 variable itself; if there are two temporaries, the variable needs to be
5766 the first thing destroyed if either of them throws. However, we only
5767 want to run the variable's cleanup if it actually got constructed. So
5768 we need to guard the temporary cleanups with the variable's cleanup if
5769 they are run on the normal path, but not if they are run on the
5770 exceptional path. We implement this by telling
5771 honor_protect_cleanup_actions to strip the variable cleanup from the
5772 exceptional path. */
5775 wrap_temporary_cleanups (tree init, tree guard)
5777 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5780 /* Generate code to initialize DECL (a local variable). */
5783 initialize_local_var (tree decl, tree init)
5785 tree type = TREE_TYPE (decl);
5789 gcc_assert (TREE_CODE (decl) == VAR_DECL
5790 || TREE_CODE (decl) == RESULT_DECL);
5791 gcc_assert (!TREE_STATIC (decl));
5793 if (DECL_SIZE (decl) == NULL_TREE)
5795 /* If we used it already as memory, it must stay in memory. */
5796 DECL_INITIAL (decl) = NULL_TREE;
5797 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5801 if (type == error_mark_node)
5804 /* Compute and store the initial value. */
5805 already_used = TREE_USED (decl) || TREE_USED (type);
5806 if (TREE_USED (type))
5807 DECL_READ_P (decl) = 1;
5809 /* Generate a cleanup, if necessary. */
5810 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5812 /* Perform the initialization. */
5815 if (TREE_CODE (init) == INIT_EXPR
5816 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5818 /* Stick simple initializers in DECL_INITIAL so that
5819 -Wno-init-self works (c++/34772). */
5820 gcc_assert (TREE_OPERAND (init, 0) == decl);
5821 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5825 int saved_stmts_are_full_exprs_p;
5827 /* If we're only initializing a single object, guard the
5828 destructors of any temporaries used in its initializer with
5829 its destructor. This isn't right for arrays because each
5830 element initialization is a full-expression. */
5831 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5832 wrap_temporary_cleanups (init, cleanup);
5834 gcc_assert (building_stmt_list_p ());
5835 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5836 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5837 finish_expr_stmt (init);
5838 current_stmt_tree ()->stmts_are_full_exprs_p =
5839 saved_stmts_are_full_exprs_p;
5843 /* Set this to 0 so we can tell whether an aggregate which was
5844 initialized was ever used. Don't do this if it has a
5845 destructor, so we don't complain about the 'resource
5846 allocation is initialization' idiom. Now set
5847 attribute((unused)) on types so decls of that type will be
5848 marked used. (see TREE_USED, above.) */
5849 if (TYPE_NEEDS_CONSTRUCTING (type)
5851 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5852 && DECL_NAME (decl))
5853 TREE_USED (decl) = 0;
5854 else if (already_used)
5855 TREE_USED (decl) = 1;
5858 finish_decl_cleanup (decl, cleanup);
5861 /* DECL is a VAR_DECL for a compiler-generated variable with static
5862 storage duration (like a virtual table) whose initializer is a
5863 compile-time constant. Initialize the variable and provide it to the
5867 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5870 gcc_assert (DECL_ARTIFICIAL (decl));
5871 init = build_constructor (TREE_TYPE (decl), v);
5872 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5873 DECL_INITIAL (decl) = init;
5874 DECL_INITIALIZED_P (decl) = 1;
5875 determine_visibility (decl);
5876 layout_var_decl (decl);
5877 maybe_commonize_var (decl);
5878 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5881 /* INIT is the initializer for a variable, as represented by the
5882 parser. Returns true iff INIT is type-dependent. */
5885 type_dependent_init_p (tree init)
5887 if (TREE_CODE (init) == TREE_LIST)
5888 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5889 return any_type_dependent_elements_p (init);
5890 else if (TREE_CODE (init) == CONSTRUCTOR)
5891 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5893 VEC(constructor_elt, gc) *elts;
5897 elts = CONSTRUCTOR_ELTS (init);
5898 nelts = VEC_length (constructor_elt, elts);
5899 for (i = 0; i < nelts; ++i)
5900 if (type_dependent_init_p (VEC_index (constructor_elt,
5905 /* It must be a simple expression, e.g., int i = 3; */
5906 return type_dependent_expression_p (init);
5911 /* INIT is the initializer for a variable, as represented by the
5912 parser. Returns true iff INIT is value-dependent. */
5915 value_dependent_init_p (tree init)
5917 if (TREE_CODE (init) == TREE_LIST)
5918 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5919 return any_value_dependent_elements_p (init);
5920 else if (TREE_CODE (init) == CONSTRUCTOR)
5921 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5923 VEC(constructor_elt, gc) *elts;
5927 elts = CONSTRUCTOR_ELTS (init);
5928 nelts = VEC_length (constructor_elt, elts);
5929 for (i = 0; i < nelts; ++i)
5930 if (value_dependent_init_p (VEC_index (constructor_elt,
5935 /* It must be a simple expression, e.g., int i = 3; */
5936 return value_dependent_expression_p (init);
5941 /* Finish processing of a declaration;
5942 install its line number and initial value.
5943 If the length of an array type is not known before,
5944 it must be determined now, from the initial value, or it is an error.
5946 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5947 true, then INIT is an integral constant expression.
5949 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5950 if the (init) syntax was used. */
5953 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5954 tree asmspec_tree, int flags)
5957 VEC(tree,gc) *cleanups = NULL;
5958 const char *asmspec = NULL;
5959 int was_readonly = 0;
5960 bool var_definition_p = false;
5963 if (decl == error_mark_node)
5968 error ("assignment (not initialization) in declaration");
5972 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5973 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5974 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5976 type = TREE_TYPE (decl);
5977 if (type == error_mark_node)
5980 /* If a name was specified, get the string. */
5981 if (at_namespace_scope_p ())
5982 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5983 if (asmspec_tree && asmspec_tree != error_mark_node)
5984 asmspec = TREE_STRING_POINTER (asmspec_tree);
5986 if (current_class_type
5987 && CP_DECL_CONTEXT (decl) == current_class_type
5988 && TYPE_BEING_DEFINED (current_class_type)
5989 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5990 && (DECL_INITIAL (decl) || init))
5991 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5993 auto_node = type_uses_auto (type);
5997 if (init == NULL_TREE)
5999 error ("declaration of %q#D has no initializer", decl);
6000 TREE_TYPE (decl) = error_mark_node;
6004 if (TREE_CODE (d_init) == TREE_LIST)
6005 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6006 tf_warning_or_error);
6007 d_init = resolve_nondeduced_context (d_init);
6008 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6010 if (type == error_mark_node)
6014 if (!ensure_literal_type_for_constexpr_object (decl))
6015 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6017 if (TREE_CODE (decl) == VAR_DECL
6018 && DECL_CLASS_SCOPE_P (decl)
6019 && DECL_INITIALIZED_IN_CLASS_P (decl))
6020 check_static_variable_definition (decl, type);
6022 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6025 if (init == ridpointers[(int)RID_DELETE])
6027 /* FIXME check this is 1st decl. */
6028 DECL_DELETED_FN (decl) = 1;
6029 DECL_DECLARED_INLINE_P (decl) = 1;
6030 DECL_INITIAL (decl) = error_mark_node;
6031 FOR_EACH_CLONE (clone, decl)
6033 DECL_DELETED_FN (clone) = 1;
6034 DECL_DECLARED_INLINE_P (clone) = 1;
6035 DECL_INITIAL (clone) = error_mark_node;
6039 else if (init == ridpointers[(int)RID_DEFAULT])
6041 if (defaultable_fn_check (decl))
6042 DECL_DEFAULTED_FN (decl) = 1;
6044 DECL_INITIAL (decl) = NULL_TREE;
6048 if (init && TREE_CODE (decl) == VAR_DECL)
6050 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6051 /* If DECL is a reference, then we want to know whether init is a
6052 reference constant; init_const_expr_p as passed tells us whether
6053 it's an rvalue constant. */
6054 if (TREE_CODE (type) == REFERENCE_TYPE)
6055 init_const_expr_p = potential_constant_expression (init);
6056 if (init_const_expr_p)
6058 /* Set these flags now for templates. We'll update the flags in
6059 store_init_value for instantiations. */
6060 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6061 if (decl_maybe_constant_var_p (decl))
6062 TREE_CONSTANT (decl) = 1;
6066 if (processing_template_decl)
6068 bool type_dependent_p;
6070 /* Add this declaration to the statement-tree. */
6071 if (at_function_scope_p ())
6072 add_decl_expr (decl);
6074 type_dependent_p = dependent_type_p (type);
6076 if (check_for_bare_parameter_packs (init))
6079 DECL_INITIAL (decl) = NULL_TREE;
6082 /* Generally, initializers in templates are expanded when the
6083 template is instantiated. But, if DECL is a variable constant
6084 then it can be used in future constant expressions, so its value
6085 must be available. */
6087 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6088 /* We can't do anything if the decl has dependent type. */;
6090 && init_const_expr_p
6091 && !type_dependent_p
6092 && decl_maybe_constant_var_p (decl)
6093 && !type_dependent_init_p (init)
6094 && !value_dependent_init_p (init))
6096 /* This variable seems to be a non-dependent constant, so process
6097 its initializer. If check_initializer returns non-null the
6098 initialization wasn't constant after all. */
6100 cleanups = make_tree_vector ();
6101 init_code = check_initializer (decl, init, flags, &cleanups);
6102 if (init_code == NULL_TREE)
6104 release_tree_vector (cleanups);
6106 else if (!DECL_PRETTY_FUNCTION_P (decl))
6107 /* Deduce array size even if the initializer is dependent. */
6108 maybe_deduce_size_from_array_init (decl, init);
6111 DECL_INITIAL (decl) = init;
6115 /* Just store non-static data member initializers for later. */
6116 if (init && TREE_CODE (decl) == FIELD_DECL)
6117 DECL_INITIAL (decl) = init;
6119 /* Take care of TYPE_DECLs up front. */
6120 if (TREE_CODE (decl) == TYPE_DECL)
6122 if (type != error_mark_node
6123 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6125 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6126 warning (0, "shadowing previous type declaration of %q#D", decl);
6127 set_identifier_type_value (DECL_NAME (decl), decl);
6130 /* If we have installed this as the canonical typedef for this
6131 type, and that type has not been defined yet, delay emitting
6132 the debug information for it, as we will emit it later. */
6133 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6134 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6135 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6137 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6142 /* A reference will be modified here, as it is initialized. */
6143 if (! DECL_EXTERNAL (decl)
6144 && TREE_READONLY (decl)
6145 && TREE_CODE (type) == REFERENCE_TYPE)
6148 TREE_READONLY (decl) = 0;
6151 if (TREE_CODE (decl) == VAR_DECL)
6153 /* Only variables with trivial initialization and destruction can
6154 have thread-local storage. */
6155 if (DECL_THREAD_LOCAL_P (decl)
6156 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6157 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6158 error ("%qD cannot be thread-local because it has non-trivial "
6159 "type %qT", decl, TREE_TYPE (decl));
6160 /* If this is a local variable that will need a mangled name,
6161 register it now. We must do this before processing the
6162 initializer for the variable, since the initialization might
6163 require a guard variable, and since the mangled name of the
6164 guard variable will depend on the mangled name of this
6166 if (DECL_FUNCTION_SCOPE_P (decl)
6167 && TREE_STATIC (decl)
6168 && !DECL_ARTIFICIAL (decl))
6170 push_local_name (decl);
6171 if (DECL_CONSTRUCTOR_P (current_function_decl)
6172 || DECL_DESTRUCTOR_P (current_function_decl))
6173 /* Normally local_decls is populated during GIMPLE lowering,
6174 but [cd]tors are never actually compiled directly. We need
6175 to put statics on the list so we can deal with the label
6176 address extension. */
6177 add_local_decl (cfun, decl);
6180 /* Convert the initializer to the type of DECL, if we have not
6181 already initialized DECL. */
6182 if (!DECL_INITIALIZED_P (decl)
6183 /* If !DECL_EXTERNAL then DECL is being defined. In the
6184 case of a static data member initialized inside the
6185 class-specifier, there can be an initializer even if DECL
6186 is *not* defined. */
6187 && (!DECL_EXTERNAL (decl) || init))
6189 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6192 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6193 /* Allow libjava/prims.cc define primitive classes. */
6194 if (init != NULL_TREE
6195 || jclass == NULL_TREE
6196 || TREE_CODE (jclass) != TYPE_DECL
6197 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6198 || !same_type_ignoring_top_level_qualifiers_p
6199 (type, TREE_TYPE (TREE_TYPE (jclass))))
6200 error ("Java object %qD not allocated with %<new%>", decl);
6203 cleanups = make_tree_vector ();
6204 init = check_initializer (decl, init, flags, &cleanups);
6205 /* Thread-local storage cannot be dynamically initialized. */
6206 if (DECL_THREAD_LOCAL_P (decl) && init)
6208 error ("%qD is thread-local and so cannot be dynamically "
6209 "initialized", decl);
6213 /* Check that the initializer for a static data member was a
6214 constant. Although we check in the parser that the
6215 initializer is an integral constant expression, we do not
6216 simplify division-by-zero at the point at which it
6217 occurs. Therefore, in:
6219 struct S { static const int i = 7 / 0; };
6221 we issue an error at this point. It would
6222 probably be better to forbid division by zero in
6223 integral constant expressions. */
6224 if (DECL_EXTERNAL (decl) && init)
6226 error ("%qD cannot be initialized by a non-constant expression"
6227 " when being declared", decl);
6228 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6236 The memory occupied by any object of static storage
6237 duration is zero-initialized at program startup before
6238 any other initialization takes place.
6240 We cannot create an appropriate initializer until after
6241 the type of DECL is finalized. If DECL_INITIAL is set,
6242 then the DECL is statically initialized, and any
6243 necessary zero-initialization has already been performed. */
6244 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6245 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6246 /*nelts=*/NULL_TREE,
6247 /*static_storage_p=*/true);
6248 /* Remember that the initialization for this variable has
6250 DECL_INITIALIZED_P (decl) = 1;
6251 /* This declaration is the definition of this variable,
6252 unless we are initializing a static data member within
6253 the class specifier. */
6254 if (!DECL_EXTERNAL (decl))
6255 var_definition_p = true;
6257 /* If the variable has an array type, lay out the type, even if
6258 there is no initializer. It is valid to index through the
6259 array, and we must get TYPE_ALIGN set correctly on the array
6261 else if (TREE_CODE (type) == ARRAY_TYPE)
6264 if (TREE_STATIC (decl)
6265 && !at_function_scope_p ()
6266 && current_function_decl == NULL)
6267 /* So decl is a global variable or a static member of a
6268 non local class. Record the types it uses
6269 so that we can decide later to emit debug info for them. */
6270 record_types_used_by_current_var_decl (decl);
6272 else if (TREE_CODE (decl) == FIELD_DECL
6273 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6274 error ("non-static data member %qD has Java class type", decl);
6276 /* Add this declaration to the statement-tree. This needs to happen
6277 after the call to check_initializer so that the DECL_EXPR for a
6278 reference temp is added before the DECL_EXPR for the reference itself. */
6279 if (DECL_FUNCTION_SCOPE_P (decl))
6280 add_decl_expr (decl);
6282 /* Let the middle end know about variables and functions -- but not
6283 static data members in uninstantiated class templates. */
6284 if (TREE_CODE (decl) == VAR_DECL
6285 || TREE_CODE (decl) == FUNCTION_DECL)
6287 if (TREE_CODE (decl) == VAR_DECL)
6289 layout_var_decl (decl);
6290 maybe_commonize_var (decl);
6293 /* This needs to happen after the linkage is set. */
6294 determine_visibility (decl);
6296 if (var_definition_p && TREE_STATIC (decl))
6298 /* If a TREE_READONLY variable needs initialization
6299 at runtime, it is no longer readonly and we need to
6300 avoid MEM_READONLY_P being set on RTL created for it. */
6303 if (TREE_READONLY (decl))
6304 TREE_READONLY (decl) = 0;
6307 else if (was_readonly)
6308 TREE_READONLY (decl) = 1;
6311 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6313 /* Check for abstractness of the type. Notice that there is no
6314 need to strip array types here since the check for those types
6315 is already done within create_array_type_for_decl. */
6316 if (TREE_CODE (type) == FUNCTION_TYPE
6317 || TREE_CODE (type) == METHOD_TYPE)
6318 abstract_virtuals_error (decl, TREE_TYPE (type));
6320 abstract_virtuals_error (decl, type);
6322 if (TREE_TYPE (decl) == error_mark_node)
6323 /* No initialization required. */
6325 else if (TREE_CODE (decl) == FUNCTION_DECL)
6329 if (init == ridpointers[(int)RID_DEFAULT])
6331 /* An out-of-class default definition is defined at
6332 the point where it is explicitly defaulted. */
6333 if (DECL_DELETED_FN (decl))
6334 maybe_explain_implicit_delete (decl);
6335 else if (DECL_INITIAL (decl) == error_mark_node)
6336 synthesize_method (decl);
6339 error ("function %q#D is initialized like a variable", decl);
6341 /* else no initialization required. */
6343 else if (DECL_EXTERNAL (decl)
6344 && ! (DECL_LANG_SPECIFIC (decl)
6345 && DECL_NOT_REALLY_EXTERN (decl)))
6348 DECL_INITIAL (decl) = init;
6350 /* A variable definition. */
6351 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6352 /* Initialize the local variable. */
6353 initialize_local_var (decl, init);
6355 /* If a variable is defined, and then a subsequent
6356 definition with external linkage is encountered, we will
6357 get here twice for the same variable. We want to avoid
6358 calling expand_static_init more than once. For variables
6359 that are not static data members, we can call
6360 expand_static_init only when we actually process the
6361 initializer. It is not legal to redeclare a static data
6362 member, so this issue does not arise in that case. */
6363 else if (var_definition_p && TREE_STATIC (decl))
6364 expand_static_init (decl, init);
6367 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6368 reference, insert it in the statement-tree now. */
6372 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6373 push_cleanup (decl, t, false);
6374 release_tree_vector (cleanups);
6378 TREE_READONLY (decl) = 1;
6380 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6383 /* Returns a declaration for a VAR_DECL as if:
6385 extern "C" TYPE NAME;
6387 had been seen. Used to create compiler-generated global
6391 declare_global_var (tree name, tree type)
6395 push_to_top_level ();
6396 decl = build_decl (input_location, VAR_DECL, name, type);
6397 TREE_PUBLIC (decl) = 1;
6398 DECL_EXTERNAL (decl) = 1;
6399 DECL_ARTIFICIAL (decl) = 1;
6400 /* If the user has explicitly declared this variable (perhaps
6401 because the code we are compiling is part of a low-level runtime
6402 library), then it is possible that our declaration will be merged
6403 with theirs by pushdecl. */
6404 decl = pushdecl (decl);
6405 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6406 pop_from_top_level ();
6411 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6412 if "__cxa_atexit" is not being used) corresponding to the function
6413 to be called when the program exits. */
6416 get_atexit_fn_ptr_type (void)
6420 if (!atexit_fn_ptr_type_node)
6423 if (flag_use_cxa_atexit
6424 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6425 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6426 arg_type = ptr_type_node;
6428 /* The parameter to "atexit" is "void (*)(void)". */
6429 arg_type = NULL_TREE;
6431 fn_type = build_function_type_list (void_type_node,
6432 arg_type, NULL_TREE);
6433 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6436 return atexit_fn_ptr_type_node;
6439 /* Returns a pointer to the `atexit' function. Note that if
6440 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6441 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6444 get_atexit_node (void)
6450 bool use_aeabi_atexit;
6455 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6457 /* The declaration for `__cxa_atexit' is:
6459 int __cxa_atexit (void (*)(void *), void *, void *)
6461 We build up the argument types and then the function type
6463 tree argtype0, argtype1, argtype2;
6465 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6466 /* First, build the pointer-to-function type for the first
6468 fn_ptr_type = get_atexit_fn_ptr_type ();
6469 /* Then, build the rest of the argument types. */
6470 argtype2 = ptr_type_node;
6471 if (use_aeabi_atexit)
6473 argtype1 = fn_ptr_type;
6474 argtype0 = ptr_type_node;
6478 argtype1 = ptr_type_node;
6479 argtype0 = fn_ptr_type;
6481 /* And the final __cxa_atexit type. */
6482 fn_type = build_function_type_list (integer_type_node,
6483 argtype0, argtype1, argtype2,
6485 fn_ptr_type = build_pointer_type (fn_type);
6486 if (use_aeabi_atexit)
6487 name = "__aeabi_atexit";
6489 name = "__cxa_atexit";
6493 /* The declaration for `atexit' is:
6495 int atexit (void (*)());
6497 We build up the argument types and then the function type
6499 fn_ptr_type = get_atexit_fn_ptr_type ();
6500 /* Build the final atexit type. */
6501 fn_type = build_function_type_list (integer_type_node,
6502 fn_ptr_type, NULL_TREE);
6506 /* Now, build the function declaration. */
6507 push_lang_context (lang_name_c);
6508 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6509 mark_used (atexit_fndecl);
6510 pop_lang_context ();
6511 atexit_node = decay_conversion (atexit_fndecl);
6516 /* Returns the __dso_handle VAR_DECL. */
6519 get_dso_handle_node (void)
6521 if (dso_handle_node)
6522 return dso_handle_node;
6524 /* Declare the variable. */
6525 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6528 #ifdef HAVE_GAS_HIDDEN
6529 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6530 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6533 return dso_handle_node;
6536 /* Begin a new function with internal linkage whose job will be simply
6537 to destroy some particular variable. */
6539 static GTY(()) int start_cleanup_cnt;
6542 start_cleanup_fn (void)
6547 bool use_cxa_atexit = flag_use_cxa_atexit
6548 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6550 push_to_top_level ();
6552 /* No need to mangle this. */
6553 push_lang_context (lang_name_c);
6555 /* Build the name of the function. */
6556 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6557 /* Build the function declaration. */
6558 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6559 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6560 /* It's a function with internal linkage, generated by the
6562 TREE_PUBLIC (fndecl) = 0;
6563 DECL_ARTIFICIAL (fndecl) = 1;
6564 /* Make the function `inline' so that it is only emitted if it is
6565 actually needed. It is unlikely that it will be inlined, since
6566 it is only called via a function pointer, but we avoid unnecessary
6567 emissions this way. */
6568 DECL_DECLARED_INLINE_P (fndecl) = 1;
6569 DECL_INTERFACE_KNOWN (fndecl) = 1;
6570 /* Build the parameter. */
6575 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6576 DECL_CONTEXT (parmdecl) = fndecl;
6577 TREE_USED (parmdecl) = 1;
6578 DECL_READ_P (parmdecl) = 1;
6579 DECL_ARGUMENTS (fndecl) = parmdecl;
6583 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6585 pop_lang_context ();
6587 return current_function_decl;
6590 /* Finish the cleanup function begun by start_cleanup_fn. */
6593 end_cleanup_fn (void)
6595 expand_or_defer_fn (finish_function (0));
6597 pop_from_top_level ();
6600 /* Generate code to handle the destruction of DECL, an object with
6601 static storage duration. */
6604 register_dtor_fn (tree decl)
6611 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6613 type = TREE_TYPE (decl);
6614 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6615 return void_zero_node;
6617 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6618 a class object, we can just pass the destructor to
6619 "__cxa_atexit"; we don't have to build a temporary function to do
6621 use_dtor = (flag_use_cxa_atexit
6622 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6623 && CLASS_TYPE_P (type));
6628 /* Find the destructor. */
6629 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6630 gcc_assert (idx >= 0);
6631 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6632 /* Make sure it is accessible. */
6633 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6637 /* Call build_cleanup before we enter the anonymous function so
6638 that any access checks will be done relative to the current
6639 scope, rather than the scope of the anonymous function. */
6640 build_cleanup (decl);
6642 /* Now start the function. */
6643 cleanup = start_cleanup_fn ();
6645 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6646 to the original function, rather than the anonymous one. That
6647 will make the back end think that nested functions are in use,
6648 which causes confusion. */
6649 push_deferring_access_checks (dk_no_check);
6650 fcall = build_cleanup (decl);
6651 pop_deferring_access_checks ();
6653 /* Create the body of the anonymous function. */
6654 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6655 finish_expr_stmt (fcall);
6656 finish_compound_stmt (compound_stmt);
6660 /* Call atexit with the cleanup function. */
6661 mark_used (cleanup);
6662 cleanup = build_address (cleanup);
6663 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6669 /* We must convert CLEANUP to the type that "__cxa_atexit"
6671 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6672 /* "__cxa_atexit" will pass the address of DECL to the
6673 cleanup function. */
6675 addr = build_address (decl);
6676 /* The declared type of the parameter to "__cxa_atexit" is
6677 "void *". For plain "T*", we could just let the
6678 machinery in cp_build_function_call convert it -- but if the
6679 type is "cv-qualified T *", then we need to convert it
6680 before passing it in, to avoid spurious errors. */
6681 addr = build_nop (ptr_type_node, addr);
6684 /* Since the cleanup functions we build ignore the address
6685 they're given, there's no reason to pass the actual address
6686 in, and, in general, it's cheaper to pass NULL than any
6688 addr = null_pointer_node;
6689 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6690 tf_warning_or_error);
6691 if (targetm.cxx.use_aeabi_atexit ())
6704 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6705 arg0, arg1, arg2, NULL_TREE);
6708 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6709 is its initializer. Generate code to handle the construction
6710 and destruction of DECL. */
6713 expand_static_init (tree decl, tree init)
6715 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6716 gcc_assert (TREE_STATIC (decl));
6718 /* Some variables require no dynamic initialization. */
6720 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6723 if (DECL_FUNCTION_SCOPE_P (decl))
6725 /* Emit code to perform this initialization but once. */
6726 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6727 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6728 tree guard, guard_addr;
6731 /* Emit code to perform this initialization but once. This code
6734 static <type> guard;
6735 if (!guard.first_byte) {
6736 if (__cxa_guard_acquire (&guard)) {
6739 // Do initialization.
6740 flag = true; __cxa_guard_release (&guard);
6741 // Register variable for destruction at end of program.
6743 if (!flag) __cxa_guard_abort (&guard);
6747 Note that the `flag' variable is only set to 1 *after* the
6748 initialization is complete. This ensures that an exception,
6749 thrown during the construction, will cause the variable to
6750 reinitialized when we pass through this code again, as per:
6754 If the initialization exits by throwing an exception, the
6755 initialization is not complete, so it will be tried again
6756 the next time control enters the declaration.
6758 This process should be thread-safe, too; multiple threads
6759 should not be able to initialize the variable more than
6762 /* Create the guard variable. */
6763 guard = get_guard (decl);
6765 /* This optimization isn't safe on targets with relaxed memory
6766 consistency. On such targets we force synchronization in
6767 __cxa_guard_acquire. */
6768 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6770 /* Begin the conditional initialization. */
6771 if_stmt = begin_if_stmt ();
6772 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6773 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6776 if (flag_threadsafe_statics)
6778 tree vfntype = NULL_TREE;
6779 tree acquire_name, release_name, abort_name;
6780 tree acquire_fn, release_fn, abort_fn;
6781 guard_addr = build_address (guard);
6783 acquire_name = get_identifier ("__cxa_guard_acquire");
6784 release_name = get_identifier ("__cxa_guard_release");
6785 abort_name = get_identifier ("__cxa_guard_abort");
6786 acquire_fn = identifier_global_value (acquire_name);
6787 release_fn = identifier_global_value (release_name);
6788 abort_fn = identifier_global_value (abort_name);
6790 acquire_fn = push_library_fn
6791 (acquire_name, build_function_type_list (integer_type_node,
6792 TREE_TYPE (guard_addr),
6795 if (!release_fn || !abort_fn)
6796 vfntype = build_function_type_list (void_type_node,
6797 TREE_TYPE (guard_addr),
6800 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6802 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6804 inner_if_stmt = begin_if_stmt ();
6805 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6808 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6809 begin = get_target_expr (boolean_false_node);
6810 flag = TARGET_EXPR_SLOT (begin);
6812 TARGET_EXPR_CLEANUP (begin)
6813 = build3 (COND_EXPR, void_type_node, flag,
6815 build_call_n (abort_fn, 1, guard_addr));
6816 CLEANUP_EH_ONLY (begin) = 1;
6818 /* Do the initialization itself. */
6819 init = add_stmt_to_compound (begin, init);
6820 init = add_stmt_to_compound
6821 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6822 init = add_stmt_to_compound
6823 (init, build_call_n (release_fn, 1, guard_addr));
6826 init = add_stmt_to_compound (init, set_guard (guard));
6828 /* Use atexit to register a function for destroying this static
6830 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6832 finish_expr_stmt (init);
6834 if (flag_threadsafe_statics)
6836 finish_compound_stmt (inner_then_clause);
6837 finish_then_clause (inner_if_stmt);
6838 finish_if_stmt (inner_if_stmt);
6841 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6843 finish_compound_stmt (then_clause);
6844 finish_then_clause (if_stmt);
6845 finish_if_stmt (if_stmt);
6849 static_aggregates = tree_cons (init, decl, static_aggregates);
6853 /* Make TYPE a complete type based on INITIAL_VALUE.
6854 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6855 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6856 3 if the initializer list is empty (in pedantic mode). */
6859 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6862 tree type, elt_type;
6866 unsigned HOST_WIDE_INT i;
6869 /* An array of character type can be initialized from a
6870 brace-enclosed string constant.
6872 FIXME: this code is duplicated from reshape_init. Probably
6873 we should just call reshape_init here? */
6874 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6875 && TREE_CODE (initial_value) == CONSTRUCTOR
6876 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6878 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6879 tree value = VEC_index (constructor_elt, v, 0)->value;
6881 if (TREE_CODE (value) == STRING_CST
6882 && VEC_length (constructor_elt, v) == 1)
6883 initial_value = value;
6886 /* If any of the elements are parameter packs, we can't actually
6887 complete this type now because the array size is dependent. */
6888 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6890 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6893 if (PACK_EXPANSION_P (value))
6899 failure = complete_array_type (ptype, initial_value, do_default);
6901 /* We can create the array before the element type is complete, which
6902 means that we didn't have these two bits set in the original type
6903 either. In completing the type, we are expected to propagate these
6904 bits. See also complete_type which does the same thing for arrays
6907 if (TYPE_DOMAIN (type))
6909 elt_type = TREE_TYPE (type);
6910 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6911 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6912 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6918 /* As above, but either give an error or reject zero-size arrays, depending
6922 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6923 bool do_default, tsubst_flags_t complain)
6926 bool sfinae = !(complain & tf_error);
6927 /* In SFINAE context we can't be lenient about zero-size arrays. */
6930 failure = cp_complete_array_type (ptype, initial_value, do_default);
6936 /* Not an error. */;
6937 else if (failure == 1)
6938 error ("initializer fails to determine size of %qT", *ptype);
6939 else if (failure == 2)
6942 error ("array size missing in %qT", *ptype);
6944 else if (failure == 3)
6945 error ("zero-size array %qT", *ptype);
6946 *ptype = error_mark_node;
6951 /* Return zero if something is declared to be a member of type
6952 CTYPE when in the context of CUR_TYPE. STRING is the error
6953 message to print in that case. Otherwise, quietly return 1. */
6956 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6958 if (ctype && ctype != cur_type)
6960 if (flags == DTOR_FLAG)
6961 error ("destructor for alien class %qT cannot be a member", ctype);
6963 error ("constructor for alien class %qT cannot be a member", ctype);
6969 /* Subroutine of `grokdeclarator'. */
6971 /* Generate errors possibly applicable for a given set of specifiers.
6972 This is for ARM $7.1.2. */
6975 bad_specifiers (tree object,
6976 enum bad_spec_place type,
6987 error ("%qD declared as a %<virtual%> variable", object);
6989 error ("%qD declared as an %<inline%> variable", object);
6991 error ("%<const%> and %<volatile%> function specifiers on "
6992 "%qD invalid in variable declaration", object);
6996 error ("%qD declared as a %<virtual%> parameter", object);
6998 error ("%qD declared as an %<inline%> parameter", object);
7000 error ("%<const%> and %<volatile%> function specifiers on "
7001 "%qD invalid in parameter declaration", object);
7005 error ("%qD declared as a %<virtual%> type", object);
7007 error ("%qD declared as an %<inline%> type", object);
7009 error ("%<const%> and %<volatile%> function specifiers on "
7010 "%qD invalid in type declaration", object);
7014 error ("%qD declared as a %<virtual%> field", object);
7016 error ("%qD declared as an %<inline%> field", object);
7018 error ("%<const%> and %<volatile%> function specifiers on "
7019 "%qD invalid in field declaration", object);
7025 error ("%q+D declared as a friend", object);
7027 && (TREE_CODE (object) == TYPE_DECL
7028 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7029 && !TYPE_REFFN_P (TREE_TYPE (object))
7030 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7031 error ("%q+D declared with an exception specification", object);
7034 /* DECL is a member function or static data member and is presently
7035 being defined. Check that the definition is taking place in a
7039 check_class_member_definition_namespace (tree decl)
7041 /* These checks only apply to member functions and static data
7043 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7044 || TREE_CODE (decl) == VAR_DECL);
7045 /* We check for problems with specializations in pt.c in
7046 check_specialization_namespace, where we can issue better
7048 if (processing_specialization)
7050 /* There are no restrictions on the placement of
7051 explicit instantiations. */
7052 if (processing_explicit_instantiation)
7056 A member function definition that appears outside of the
7057 class definition shall appear in a namespace scope enclosing
7058 the class definition.
7062 The definition for a static data member shall appear in a
7063 namespace scope enclosing the member's class definition. */
7064 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7065 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7066 decl, DECL_CONTEXT (decl));
7069 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7070 METHOD_TYPE for a non-static member function; QUALS are the
7071 cv-qualifiers that apply to the function. */
7074 build_this_parm (tree type, cp_cv_quals quals)
7079 cp_cv_quals this_quals;
7081 if (CLASS_TYPE_P (type))
7084 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7085 this_type = build_pointer_type (this_type);
7088 this_type = type_of_this_parm (type);
7089 /* The `this' parameter is implicitly `const'; it cannot be
7091 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7092 qual_type = cp_build_qualified_type (this_type, this_quals);
7093 parm = build_artificial_parm (this_identifier, qual_type);
7094 cp_apply_type_quals_to_decl (this_quals, parm);
7098 /* DECL is a static member function. Complain if it was declared
7099 with function-cv-quals. */
7102 check_static_quals (tree decl, cp_cv_quals quals)
7104 if (quals != TYPE_UNQUALIFIED)
7105 error ("static member function %q#D declared with type qualifiers",
7109 /* CTYPE is class type, or null if non-class.
7110 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7112 DECLARATOR is the function's name.
7113 PARMS is a chain of PARM_DECLs for the function.
7114 VIRTUALP is truthvalue of whether the function is virtual or not.
7115 FLAGS are to be passed through to `grokclassfn'.
7116 QUALS are qualifiers indicating whether the function is `const'
7118 RAISES is a list of exceptions that this function can raise.
7119 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7120 not look, and -1 if we should not call `grokclassfn' at all.
7122 SFK is the kind of special function (if any) for the new function.
7124 Returns `NULL_TREE' if something goes wrong, after issuing
7125 applicable error messages. */
7128 grokfndecl (tree ctype,
7132 tree orig_declarator,
7134 enum overload_flags flags,
7141 special_function_kind sfk,
7146 location_t location)
7149 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7153 type = build_exception_variant (type, raises);
7155 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7157 /* If we have an explicit location, use it, otherwise use whatever
7158 build_lang_decl used (probably input_location). */
7159 if (location != UNKNOWN_LOCATION)
7160 DECL_SOURCE_LOCATION (decl) = location;
7162 if (TREE_CODE (type) == METHOD_TYPE)
7165 parm = build_this_parm (type, quals);
7166 DECL_CHAIN (parm) = parms;
7169 DECL_ARGUMENTS (decl) = parms;
7170 for (t = parms; t; t = DECL_CHAIN (t))
7171 DECL_CONTEXT (t) = decl;
7172 /* Propagate volatile out from type to decl. */
7173 if (TYPE_VOLATILE (type))
7174 TREE_THIS_VOLATILE (decl) = 1;
7176 /* Setup decl according to sfk. */
7179 case sfk_constructor:
7180 case sfk_copy_constructor:
7181 case sfk_move_constructor:
7182 DECL_CONSTRUCTOR_P (decl) = 1;
7184 case sfk_destructor:
7185 DECL_DESTRUCTOR_P (decl) = 1;
7191 /* If pointers to member functions use the least significant bit to
7192 indicate whether a function is virtual, ensure a pointer
7193 to this function will have that bit clear. */
7194 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7195 && TREE_CODE (type) == METHOD_TYPE
7196 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7197 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7200 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7204 ("defining explicit specialization %qD in friend declaration",
7208 tree fns = TREE_OPERAND (orig_declarator, 0);
7209 tree args = TREE_OPERAND (orig_declarator, 1);
7211 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7213 /* Something like `template <class T> friend void f<T>()'. */
7214 error ("invalid use of template-id %qD in declaration "
7215 "of primary template",
7221 /* A friend declaration of the form friend void f<>(). Record
7222 the information in the TEMPLATE_ID_EXPR. */
7223 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7225 if (TREE_CODE (fns) == COMPONENT_REF)
7227 /* Due to bison parser ickiness, we will have already looked
7228 up an operator_name or PFUNCNAME within the current class
7229 (see template_id in parse.y). If the current class contains
7230 such a name, we'll get a COMPONENT_REF here. Undo that. */
7232 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7233 == current_class_type);
7234 fns = TREE_OPERAND (fns, 1);
7236 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7237 || TREE_CODE (fns) == OVERLOAD);
7238 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7240 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7241 if (TREE_PURPOSE (t)
7242 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7244 error ("default arguments are not allowed in declaration "
7245 "of friend template specialization %qD",
7252 error ("%<inline%> is not allowed in declaration of friend "
7253 "template specialization %qD",
7260 /* If this decl has namespace scope, set that up. */
7262 set_decl_namespace (decl, in_namespace, friendp);
7264 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7266 /* `main' and builtins have implicit 'C' linkage. */
7267 if ((MAIN_NAME_P (declarator)
7268 || (IDENTIFIER_LENGTH (declarator) > 10
7269 && IDENTIFIER_POINTER (declarator)[0] == '_'
7270 && IDENTIFIER_POINTER (declarator)[1] == '_'
7271 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7272 && current_lang_name == lang_name_cplusplus
7273 && ctype == NULL_TREE
7274 && DECL_FILE_SCOPE_P (decl))
7275 SET_DECL_LANGUAGE (decl, lang_c);
7277 /* Should probably propagate const out from type to decl I bet (mrs). */
7280 DECL_STATIC_FUNCTION_P (decl) = 1;
7281 DECL_CONTEXT (decl) = ctype;
7286 DECL_CONTEXT (decl) = ctype;
7288 check_class_member_definition_namespace (decl);
7291 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7293 if (processing_template_decl)
7294 error ("cannot declare %<::main%> to be a template");
7296 error ("cannot declare %<::main%> to be inline");
7298 error ("cannot declare %<::main%> to be static");
7303 /* Members of anonymous types and local classes have no linkage; make
7304 them internal. If a typedef is made later, this will be changed. */
7305 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7306 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7309 if (publicp && cxx_dialect == cxx98)
7311 /* [basic.link]: A name with no linkage (notably, the name of a class
7312 or enumeration declared in a local scope) shall not be used to
7313 declare an entity with linkage.
7315 DR 757 relaxes this restriction for C++0x. */
7316 t = no_linkage_check (TREE_TYPE (decl),
7317 /*relaxed_p=*/false);
7320 if (TYPE_ANONYMOUS_P (t))
7322 if (DECL_EXTERN_C_P (decl))
7323 /* Allow this; it's pretty common in C. */;
7326 permerror (input_location, "anonymous type with no linkage "
7327 "used to declare function %q#D with linkage",
7329 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7330 permerror (input_location, "%q+#D does not refer to the unqualified "
7331 "type, so it is not used for linkage",
7336 permerror (input_location, "type %qT with no linkage used to "
7337 "declare function %q#D with linkage", t, decl);
7341 TREE_PUBLIC (decl) = publicp;
7344 DECL_INTERFACE_KNOWN (decl) = 1;
7345 DECL_NOT_REALLY_EXTERN (decl) = 1;
7348 /* If the declaration was declared inline, mark it as such. */
7350 DECL_DECLARED_INLINE_P (decl) = 1;
7352 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7354 DECL_EXTERNAL (decl) = 1;
7355 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7358 ? G_("static member function %qD cannot have cv-qualifier")
7359 : G_("non-member function %qD cannot have cv-qualifier"),
7361 quals = TYPE_UNQUALIFIED;
7364 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7365 && !grok_op_properties (decl, /*complain=*/true))
7367 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7369 bool long_long_unsigned_p;
7371 const char *suffix = NULL;
7372 /* [over.literal]/6: Literal operators shall not have C linkage. */
7373 if (DECL_LANGUAGE (decl) == lang_c)
7375 error ("literal operator with C linkage");
7379 if (DECL_NAMESPACE_SCOPE_P (decl))
7381 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7384 error ("%qD has invalid argument list", decl);
7388 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7389 if (long_long_unsigned_p)
7391 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7392 warning (0, "integer suffix %<%s%>"
7393 " shadowed by implementation", suffix);
7395 else if (long_double_p)
7397 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7398 warning (0, "floating point suffix %<%s%>"
7399 " shadowed by implementation", suffix);
7404 error ("%qD must be a non-member function", decl);
7410 /* Make the init_value nonzero so pushdecl knows this is not
7411 tentative. error_mark_node is replaced later with the BLOCK. */
7412 DECL_INITIAL (decl) = error_mark_node;
7414 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7415 TREE_NOTHROW (decl) = 1;
7417 /* Caller will do the rest of this. */
7421 if (ctype != NULL_TREE)
7422 grokclassfn (ctype, decl, flags);
7424 decl = check_explicit_specialization (orig_declarator, decl,
7427 4 * (friendp != 0));
7428 if (decl == error_mark_node)
7431 if (DECL_STATIC_FUNCTION_P (decl))
7432 check_static_quals (decl, quals);
7436 cplus_decl_attributes (&decl, *attrlist, 0);
7437 *attrlist = NULL_TREE;
7440 /* Check main's type after attributes have been applied. */
7441 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7443 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7446 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7448 error ("%<::main%> must return %<int%>");
7449 newtype = build_function_type (integer_type_node, oldtypeargs);
7450 TREE_TYPE (decl) = newtype;
7453 check_main_parameter_types (decl);
7456 if (ctype != NULL_TREE
7457 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7460 tree old_decl = check_classfn (ctype, decl,
7461 (processing_template_decl
7462 > template_class_depth (ctype))
7463 ? current_template_parms
7466 if (old_decl == error_mark_node)
7474 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7475 /* Because grokfndecl is always supposed to return a
7476 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7477 here. We depend on our callers to figure out that its
7478 really a template that's being returned. */
7479 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7481 if (DECL_STATIC_FUNCTION_P (old_decl)
7482 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7484 /* Remove the `this' parm added by grokclassfn. */
7485 revert_static_member_fn (decl);
7486 check_static_quals (decl, quals);
7488 if (DECL_ARTIFICIAL (old_decl))
7490 error ("definition of implicitly-declared %qD", old_decl);
7493 else if (DECL_DEFAULTED_FN (old_decl))
7495 error ("definition of explicitly-defaulted %q+D", decl);
7496 error ("%q+#D explicitly defaulted here", old_decl);
7500 /* Since we've smashed OLD_DECL to its
7501 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7502 if (TREE_CODE (decl) == TEMPLATE_DECL)
7503 decl = DECL_TEMPLATE_RESULT (decl);
7505 /* Attempt to merge the declarations. This can fail, in
7506 the case of some invalid specialization declarations. */
7507 pushed_scope = push_scope (ctype);
7508 ok = duplicate_decls (decl, old_decl, friendp);
7510 pop_scope (pushed_scope);
7513 error ("no %q#D member function declared in class %qT",
7521 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7524 if (ctype == NULL_TREE || check)
7528 DECL_VIRTUAL_P (decl) = 1;
7533 /* decl is a FUNCTION_DECL.
7534 specifiers are the parsed virt-specifiers.
7536 Set flags to reflect the virt-specifiers.
7541 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7543 if (decl == NULL_TREE)
7545 if (specifiers & VIRT_SPEC_OVERRIDE)
7546 DECL_OVERRIDE_P (decl) = 1;
7547 if (specifiers & VIRT_SPEC_FINAL)
7548 DECL_FINAL_P (decl) = 1;
7552 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7553 the linkage that DECL will receive in the object file. */
7556 set_linkage_for_static_data_member (tree decl)
7558 /* A static data member always has static storage duration and
7559 external linkage. Note that static data members are forbidden in
7560 local classes -- the only situation in which a class has
7561 non-external linkage. */
7562 TREE_PUBLIC (decl) = 1;
7563 TREE_STATIC (decl) = 1;
7564 /* For non-template classes, static data members are always put
7565 out in exactly those files where they are defined, just as
7566 with ordinary namespace-scope variables. */
7567 if (!processing_template_decl)
7568 DECL_INTERFACE_KNOWN (decl) = 1;
7571 /* Create a VAR_DECL named NAME with the indicated TYPE.
7573 If SCOPE is non-NULL, it is the class type or namespace containing
7574 the variable. If SCOPE is NULL, the variable should is created in
7575 the innermost enclosings scope. */
7578 grokvardecl (tree type,
7580 const cp_decl_specifier_seq *declspecs,
7586 tree explicit_scope;
7588 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7590 /* Compute the scope in which to place the variable, but remember
7591 whether or not that scope was explicitly specified by the user. */
7592 explicit_scope = scope;
7595 /* An explicit "extern" specifier indicates a namespace-scope
7597 if (declspecs->storage_class == sc_extern)
7598 scope = current_decl_namespace ();
7599 else if (!at_function_scope_p ())
7600 scope = current_scope ();
7604 && (/* If the variable is a namespace-scope variable declared in a
7605 template, we need DECL_LANG_SPECIFIC. */
7606 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7607 /* Similarly for namespace-scope variables with language linkage
7609 || (TREE_CODE (scope) == NAMESPACE_DECL
7610 && current_lang_name != lang_name_cplusplus)
7611 /* Similarly for static data members. */
7613 decl = build_lang_decl (VAR_DECL, name, type);
7615 decl = build_decl (input_location, VAR_DECL, name, type);
7617 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7618 set_decl_namespace (decl, explicit_scope, 0);
7620 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7622 if (declspecs->storage_class == sc_extern)
7624 DECL_THIS_EXTERN (decl) = 1;
7625 DECL_EXTERNAL (decl) = !initialized;
7628 if (DECL_CLASS_SCOPE_P (decl))
7630 set_linkage_for_static_data_member (decl);
7631 /* This function is only called with out-of-class definitions. */
7632 DECL_EXTERNAL (decl) = 0;
7633 check_class_member_definition_namespace (decl);
7635 /* At top level, either `static' or no s.c. makes a definition
7636 (perhaps tentative), and absence of `static' makes it public. */
7637 else if (toplevel_bindings_p ())
7639 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7640 && (DECL_THIS_EXTERN (decl) || ! constp));
7641 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7643 /* Not at top level, only `static' makes a static definition. */
7646 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7647 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7650 if (declspecs->specs[(int)ds_thread])
7651 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7653 /* If the type of the decl has no linkage, make sure that we'll
7654 notice that in mark_used. */
7655 if (cxx_dialect > cxx98
7656 && decl_linkage (decl) != lk_none
7657 && DECL_LANG_SPECIFIC (decl) == NULL
7658 && !DECL_EXTERN_C_P (decl)
7659 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7660 retrofit_lang_decl (decl);
7662 if (TREE_PUBLIC (decl))
7664 /* [basic.link]: A name with no linkage (notably, the name of a class
7665 or enumeration declared in a local scope) shall not be used to
7666 declare an entity with linkage.
7668 DR 757 relaxes this restriction for C++0x. */
7669 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7670 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7673 if (TYPE_ANONYMOUS_P (t))
7675 if (DECL_EXTERN_C_P (decl))
7676 /* Allow this; it's pretty common in C. */
7680 /* DRs 132, 319 and 389 seem to indicate types with
7681 no linkage can only be used to declare extern "C"
7682 entities. Since it's not always an error in the
7683 ISO C++ 90 Standard, we only issue a warning. */
7684 warning (0, "anonymous type with no linkage used to declare "
7685 "variable %q#D with linkage", decl);
7686 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7687 warning (0, "%q+#D does not refer to the unqualified "
7688 "type, so it is not used for linkage",
7693 warning (0, "type %qT with no linkage used to declare variable "
7694 "%q#D with linkage", t, decl);
7698 DECL_INTERFACE_KNOWN (decl) = 1;
7703 /* Create and return a canonical pointer to member function type, for
7704 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7707 build_ptrmemfunc_type (tree type)
7711 tree unqualified_variant = NULL_TREE;
7713 if (type == error_mark_node)
7716 /* If a canonical type already exists for this type, use it. We use
7717 this method instead of type_hash_canon, because it only does a
7718 simple equality check on the list of field members. */
7720 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7723 /* Make sure that we always have the unqualified pointer-to-member
7725 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7727 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7729 t = make_class_type (RECORD_TYPE);
7730 xref_basetypes (t, NULL_TREE);
7732 /* Let the front end know this is a pointer to member function... */
7733 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7734 /* ... and not really a class type. */
7735 SET_CLASS_TYPE_P (t, 0);
7737 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7740 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7742 DECL_CHAIN (field) = fields;
7745 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7747 /* Zap out the name so that the back end will give us the debugging
7748 information for this anonymous RECORD_TYPE. */
7749 TYPE_NAME (t) = NULL_TREE;
7751 /* If this is not the unqualified form of this pointer-to-member
7752 type, set the TYPE_MAIN_VARIANT for this type to be the
7753 unqualified type. Since they are actually RECORD_TYPEs that are
7754 not variants of each other, we must do this manually.
7755 As we just built a new type there is no need to do yet another copy. */
7756 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7758 int type_quals = cp_type_quals (type);
7759 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7760 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7761 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7762 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7763 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7764 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7765 TREE_TYPE (TYPE_BINFO (t)) = t;
7768 /* Cache this pointer-to-member type so that we can find it again
7770 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7772 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7773 SET_TYPE_STRUCTURAL_EQUALITY (t);
7774 else if (TYPE_CANONICAL (type) != type)
7775 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7780 /* Create and return a pointer to data member type. */
7783 build_ptrmem_type (tree class_type, tree member_type)
7785 if (TREE_CODE (member_type) == METHOD_TYPE)
7787 cp_cv_quals quals = type_memfn_quals (member_type);
7788 member_type = build_memfn_type (member_type, class_type, quals);
7789 return build_ptrmemfunc_type (build_pointer_type (member_type));
7793 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7794 return build_offset_type (class_type, member_type);
7798 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7799 Check to see that the definition is valid. Issue appropriate error
7800 messages. Return 1 if the definition is particularly bad, or 0
7804 check_static_variable_definition (tree decl, tree type)
7806 /* Can't check yet if we don't know the type. */
7807 if (dependent_type_p (type))
7809 /* If DECL is declared constexpr, we'll do the appropriate checks
7810 in check_initializer. */
7811 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7813 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7815 if (!COMPLETE_TYPE_P (type))
7816 error ("in-class initialization of static data member %q#D of "
7817 "incomplete type", decl);
7818 else if (literal_type_p (type))
7819 permerror (input_location,
7820 "%<constexpr%> needed for in-class initialization of "
7821 "static data member %q#D of non-integral type", decl);
7823 error ("in-class initialization of static data member %q#D of "
7824 "non-literal type", decl);
7828 /* Motion 10 at San Diego: If a static const integral data member is
7829 initialized with an integral constant expression, the initializer
7830 may appear either in the declaration (within the class), or in
7831 the definition, but not both. If it appears in the class, the
7832 member is a member constant. The file-scope definition is always
7834 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7836 error ("invalid in-class initialization of static data member "
7837 "of non-integral type %qT",
7841 else if (!CP_TYPE_CONST_P (type))
7842 error ("ISO C++ forbids in-class initialization of non-const "
7843 "static member %qD",
7845 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7846 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7847 "%qD of non-integral type %qT", decl, type);
7852 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7853 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7854 expressions out into temporary variables so that walk_tree doesn't
7855 step into them (c++/15764). */
7858 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7860 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7861 tree expr = *expr_p;
7862 if (TREE_CODE (expr) == SAVE_EXPR)
7864 tree op = TREE_OPERAND (expr, 0);
7865 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7866 if (TREE_SIDE_EFFECTS (op))
7867 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7870 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7875 /* Entry point for the above. */
7878 stabilize_vla_size (tree size)
7880 struct pointer_set_t *pset = pointer_set_create ();
7881 /* Break out any function calls into temporary variables. */
7882 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7885 /* Given the SIZE (i.e., number of elements) in an array, compute an
7886 appropriate index type for the array. If non-NULL, NAME is the
7887 name of the thing being declared. */
7890 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7895 tree abi_1_itype = NULL_TREE;
7897 if (error_operand_p (size))
7898 return error_mark_node;
7900 type = TREE_TYPE (size);
7901 /* type_dependent_expression_p? */
7902 if (!dependent_type_p (type))
7904 mark_rvalue_use (size);
7906 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7907 && TREE_SIDE_EFFECTS (size))
7908 /* In C++98, we mark a non-constant array bound with a magic
7909 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7912 size = fold_non_dependent_expr (size);
7914 if (CLASS_TYPE_P (type)
7915 && CLASSTYPE_LITERAL_P (type))
7917 size = build_expr_type_conversion (WANT_INT, size, true);
7920 if (!(complain & tf_error))
7921 return error_mark_node;
7923 error ("size of array %qD has non-integral type %qT",
7926 error ("size of array has non-integral type %qT", type);
7927 size = integer_one_node;
7929 if (size == error_mark_node)
7930 return error_mark_node;
7931 type = TREE_TYPE (size);
7932 /* We didn't support this case in GCC 3.2, so don't bother
7933 trying to model it now in ABI v1. */
7934 abi_1_itype = error_mark_node;
7937 size = maybe_constant_value (size);
7938 if (!TREE_CONSTANT (size))
7942 if (error_operand_p (size))
7943 return error_mark_node;
7945 /* The array bound must be an integer type. */
7946 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7948 if (!(complain & tf_error))
7949 return error_mark_node;
7951 error ("size of array %qD has non-integral type %qT", name, type);
7953 error ("size of array has non-integral type %qT", type);
7954 size = integer_one_node;
7955 type = TREE_TYPE (size);
7959 /* A type is dependent if it is...an array type constructed from any
7960 dependent type or whose size is specified by a constant expression
7961 that is value-dependent. */
7962 /* We can only call value_dependent_expression_p on integral constant
7963 expressions; treat non-constant expressions as dependent, too. */
7964 if (processing_template_decl
7965 && (dependent_type_p (type)
7966 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7968 /* We cannot do any checking for a SIZE that isn't known to be
7969 constant. Just build the index type and mark that it requires
7970 structural equality checks. */
7971 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7972 size, integer_one_node));
7973 TYPE_DEPENDENT_P (itype) = 1;
7974 TYPE_DEPENDENT_P_VALID (itype) = 1;
7975 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7979 if (!abi_version_at_least (2) && processing_template_decl
7980 && abi_1_itype == NULL_TREE)
7981 /* For abi-1, we handled all instances in templates the same way,
7982 even when they were non-dependent. This affects the manglings
7983 produced. So, we do the normal checking for non-dependent
7984 sizes, but at the end we'll return the same type that abi-1
7985 would have, but with TYPE_CANONICAL set to the "right"
7986 value that the current ABI would provide. */
7987 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7988 osize, integer_one_node));
7990 /* Normally, the array-bound will be a constant. */
7991 if (TREE_CODE (size) == INTEGER_CST)
7993 /* Check to see if the array bound overflowed. Make that an
7994 error, no matter how generous we're being. */
7995 constant_expression_error (size);
7997 /* An array must have a positive number of elements. */
7998 if (INT_CST_LT (size, integer_zero_node))
8000 if (!(complain & tf_error))
8001 return error_mark_node;
8003 error ("size of array %qD is negative", name);
8005 error ("size of array is negative");
8006 size = integer_one_node;
8008 /* As an extension we allow zero-sized arrays. */
8009 else if (integer_zerop (size))
8011 if (!(complain & tf_error))
8012 /* We must fail if performing argument deduction (as
8013 indicated by the state of complain), so that
8014 another substitution can be found. */
8015 return error_mark_node;
8016 else if (in_system_header)
8017 /* Allow them in system headers because glibc uses them. */;
8019 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
8021 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
8024 else if (TREE_CONSTANT (size)
8025 /* We don't allow VLAs at non-function scopes, or during
8026 tentative template substitution. */
8027 || !at_function_scope_p () || !(complain & tf_error))
8029 if (!(complain & tf_error))
8030 return error_mark_node;
8031 /* `(int) &fn' is not a valid array bound. */
8033 error ("size of array %qD is not an integral constant-expression",
8036 error ("size of array is not an integral constant-expression");
8037 size = integer_one_node;
8039 else if (pedantic && warn_vla != 0)
8042 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8044 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8046 else if (warn_vla > 0)
8050 "variable length array %qD is used", name);
8053 "variable length array is used");
8056 if (processing_template_decl && !TREE_CONSTANT (size))
8057 /* A variable sized array. */
8058 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8061 HOST_WIDE_INT saved_processing_template_decl;
8063 /* Compute the index of the largest element in the array. It is
8064 one less than the number of elements in the array. We save
8065 and restore PROCESSING_TEMPLATE_DECL so that computations in
8066 cp_build_binary_op will be appropriately folded. */
8067 saved_processing_template_decl = processing_template_decl;
8068 processing_template_decl = 0;
8069 itype = cp_build_binary_op (input_location,
8071 cp_convert (ssizetype, size),
8072 cp_convert (ssizetype, integer_one_node),
8073 tf_warning_or_error);
8074 itype = fold (itype);
8075 processing_template_decl = saved_processing_template_decl;
8077 if (!TREE_CONSTANT (itype))
8078 /* A variable sized array. */
8079 itype = variable_size (itype);
8080 /* Make sure that there was no overflow when creating to a signed
8081 index type. (For example, on a 32-bit machine, an array with
8082 size 2^32 - 1 is too big.) */
8083 else if (TREE_CODE (itype) == INTEGER_CST
8084 && TREE_OVERFLOW (itype))
8086 if (!(complain & tf_error))
8087 return error_mark_node;
8088 error ("overflow in array dimension");
8089 TREE_OVERFLOW (itype) = 0;
8093 /* Create and return the appropriate index type. */
8094 if (abi_1_itype && abi_1_itype != error_mark_node)
8096 tree t = build_index_type (itype);
8097 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8098 itype = abi_1_itype;
8101 itype = build_index_type (itype);
8103 /* If the index type were dependent, we would have returned early, so
8104 remember that it isn't. */
8105 TYPE_DEPENDENT_P (itype) = 0;
8106 TYPE_DEPENDENT_P_VALID (itype) = 1;
8110 /* Returns the scope (if any) in which the entity declared by
8111 DECLARATOR will be located. If the entity was declared with an
8112 unqualified name, NULL_TREE is returned. */
8115 get_scope_of_declarator (const cp_declarator *declarator)
8117 while (declarator && declarator->kind != cdk_id)
8118 declarator = declarator->declarator;
8120 /* If the declarator-id is a SCOPE_REF, the scope in which the
8121 declaration occurs is the first operand. */
8123 && declarator->u.id.qualifying_scope)
8124 return declarator->u.id.qualifying_scope;
8126 /* Otherwise, the declarator is not a qualified name; the entity will
8127 be declared in the current scope. */
8131 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8132 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8136 create_array_type_for_decl (tree name, tree type, tree size)
8138 tree itype = NULL_TREE;
8140 /* If things have already gone awry, bail now. */
8141 if (type == error_mark_node || size == error_mark_node)
8142 return error_mark_node;
8144 /* 8.3.4/1: If the type of the identifier of D contains the auto
8145 type-specifier, the program is ill-formed. */
8146 if (pedantic && type_uses_auto (type))
8147 pedwarn (input_location, OPT_pedantic,
8148 "declaration of %qD as array of %<auto%>", name);
8150 /* If there are some types which cannot be array elements,
8151 issue an error-message and return. */
8152 switch (TREE_CODE (type))
8156 error ("declaration of %qD as array of void", name);
8158 error ("creating array of void");
8159 return error_mark_node;
8163 error ("declaration of %qD as array of functions", name);
8165 error ("creating array of functions");
8166 return error_mark_node;
8168 case REFERENCE_TYPE:
8170 error ("declaration of %qD as array of references", name);
8172 error ("creating array of references");
8173 return error_mark_node;
8177 error ("declaration of %qD as array of function members", name);
8179 error ("creating array of function members");
8180 return error_mark_node;
8188 The constant expressions that specify the bounds of the arrays
8189 can be omitted only for the first member of the sequence. */
8190 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8193 error ("declaration of %qD as multidimensional array must "
8194 "have bounds for all dimensions except the first",
8197 error ("multidimensional array must have bounds for all "
8198 "dimensions except the first");
8200 return error_mark_node;
8203 /* Figure out the index type for the array. */
8205 itype = compute_array_index_type (name, size, tf_warning_or_error);
8208 T is called the array element type; this type shall not be [...] an
8209 abstract class type. */
8210 abstract_virtuals_error (name, type);
8212 return build_cplus_array_type (type, itype);
8215 /* Check that it's OK to declare a function with the indicated TYPE.
8216 SFK indicates the kind of special function (if any) that this
8217 function is. OPTYPE is the type given in a conversion operator
8218 declaration, or the class type for a constructor/destructor.
8219 Returns the actual return type of the function; that
8220 may be different than TYPE if an error occurs, or for certain
8221 special functions. */
8224 check_special_function_return_type (special_function_kind sfk,
8230 case sfk_constructor:
8232 error ("return type specification for constructor invalid");
8234 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8235 type = build_pointer_type (optype);
8237 type = void_type_node;
8240 case sfk_destructor:
8242 error ("return type specification for destructor invalid");
8243 /* We can't use the proper return type here because we run into
8244 problems with ambiguous bases and covariant returns.
8245 Java classes are left unchanged because (void *) isn't a valid
8246 Java type, and we don't want to change the Java ABI. */
8247 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8248 type = build_pointer_type (void_type_node);
8250 type = void_type_node;
8253 case sfk_conversion:
8255 error ("return type specified for %<operator %T%>", optype);
8266 /* A variable or data member (whose unqualified name is IDENTIFIER)
8267 has been declared with the indicated TYPE. If the TYPE is not
8268 acceptable, issue an error message and return a type to use for
8269 error-recovery purposes. */
8272 check_var_type (tree identifier, tree type)
8274 if (VOID_TYPE_P (type))
8277 error ("unnamed variable or field declared void");
8278 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8280 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8281 error ("variable or field %qE declared void", identifier);
8284 error ("variable or field declared void");
8285 type = error_mark_node;
8291 /* Given declspecs and a declarator (abstract or otherwise), determine
8292 the name and type of the object declared and construct a DECL node
8295 DECLSPECS points to the representation of declaration-specifier
8296 sequence that precedes declarator.
8298 DECL_CONTEXT says which syntactic context this declaration is in:
8299 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8300 FUNCDEF for a function definition. Like NORMAL but a few different
8301 error messages in each case. Return value may be zero meaning
8302 this definition is too screwy to try to parse.
8303 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8304 handle member functions (which have FIELD context).
8305 Return value may be zero meaning this definition is too screwy to
8307 PARM for a parameter declaration (either within a function prototype
8308 or before a function body). Make a PARM_DECL, or return void_type_node.
8309 TPARM for a template parameter declaration.
8310 CATCHPARM for a parameter declaration before a catch clause.
8311 TYPENAME if for a typename (in a cast or sizeof).
8312 Don't make a DECL node; just return the ..._TYPE node.
8313 FIELD for a struct or union field; make a FIELD_DECL.
8314 BITFIELD for a field with specified width.
8316 INITIALIZED is as for start_decl.
8318 ATTRLIST is a pointer to the list of attributes, which may be NULL
8319 if there are none; *ATTRLIST may be modified if attributes from inside
8320 the declarator should be applied to the declaration.
8322 When this function is called, scoping variables (such as
8323 CURRENT_CLASS_TYPE) should reflect the scope in which the
8324 declaration occurs, not the scope in which the new declaration will
8325 be placed. For example, on:
8329 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8332 Returns a DECL (if a declarator is present), a TYPE (if there is no
8333 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8337 grokdeclarator (const cp_declarator *declarator,
8338 const cp_decl_specifier_seq *declspecs,
8339 enum decl_context decl_context,
8343 tree type = NULL_TREE;
8345 int explicit_int128 = 0;
8346 int virtualp, explicitp, friendp, inlinep, staticp;
8347 int explicit_int = 0;
8348 int explicit_char = 0;
8349 int defaulted_int = 0;
8350 tree dependent_name = NULL_TREE;
8352 tree typedef_decl = NULL_TREE;
8353 const char *name = NULL;
8354 tree typedef_type = NULL_TREE;
8355 /* True if this declarator is a function definition. */
8356 bool funcdef_flag = false;
8357 cp_declarator_kind innermost_code = cdk_error;
8360 /* See the code below that used this. */
8361 tree decl_attr = NULL_TREE;
8364 /* Keep track of what sort of function is being processed
8365 so that we can warn about default return values, or explicit
8366 return values which do not match prescribed defaults. */
8367 special_function_kind sfk = sfk_none;
8369 tree dname = NULL_TREE;
8370 tree ctor_return_type = NULL_TREE;
8371 enum overload_flags flags = NO_SPECIAL;
8372 /* cv-qualifiers that apply to the declarator, for a declaration of
8373 a member function. */
8374 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8375 /* virt-specifiers that apply to the declarator, for a declaration of
8376 a member function. */
8377 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8378 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8380 tree raises = NULL_TREE;
8381 int template_count = 0;
8382 tree returned_attrs = NULL_TREE;
8383 tree parms = NULL_TREE;
8384 const cp_declarator *id_declarator;
8385 /* The unqualified name of the declarator; either an
8386 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8387 tree unqualified_id;
8388 /* The class type, if any, in which this entity is located,
8389 or NULL_TREE if none. Note that this value may be different from
8390 the current class type; for example if an attempt is made to declare
8391 "A::f" inside "B", this value will be "A". */
8392 tree ctype = current_class_type;
8393 /* The NAMESPACE_DECL for the namespace in which this entity is
8394 located. If an unqualified name is used to declare the entity,
8395 this value will be NULL_TREE, even if the entity is located at
8397 tree in_namespace = NULL_TREE;
8398 cp_storage_class storage_class;
8399 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8400 bool type_was_error_mark_node = false;
8401 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8402 bool template_type_arg = false;
8403 bool template_parm_flag = false;
8404 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8407 signed_p = declspecs->specs[(int)ds_signed];
8408 unsigned_p = declspecs->specs[(int)ds_unsigned];
8409 short_p = declspecs->specs[(int)ds_short];
8410 long_p = declspecs->specs[(int)ds_long];
8411 longlong = declspecs->specs[(int)ds_long] >= 2;
8412 explicit_int128 = declspecs->explicit_int128_p;
8413 thread_p = declspecs->specs[(int)ds_thread];
8415 if (decl_context == FUNCDEF)
8416 funcdef_flag = true, decl_context = NORMAL;
8417 else if (decl_context == MEMFUNCDEF)
8418 funcdef_flag = true, decl_context = FIELD;
8419 else if (decl_context == BITFIELD)
8420 bitfield = 1, decl_context = FIELD;
8421 else if (decl_context == TEMPLATE_TYPE_ARG)
8422 template_type_arg = true, decl_context = TYPENAME;
8423 else if (decl_context == TPARM)
8424 template_parm_flag = true, decl_context = PARM;
8426 if (initialized > 1)
8427 funcdef_flag = true;
8429 /* Look inside a declarator for the name being declared
8430 and get it as a string, for an error message. */
8431 for (id_declarator = declarator;
8433 id_declarator = id_declarator->declarator)
8435 if (id_declarator->kind != cdk_id)
8436 innermost_code = id_declarator->kind;
8438 switch (id_declarator->kind)
8441 if (id_declarator->declarator
8442 && id_declarator->declarator->kind == cdk_id)
8444 sfk = id_declarator->declarator->u.id.sfk;
8445 if (sfk == sfk_destructor)
8452 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8453 tree decl = id_declarator->u.id.unqualified_name;
8456 if (qualifying_scope)
8458 if (at_function_scope_p ())
8462 A declarator-id shall not be qualified except
8465 None of the cases are permitted in block
8467 if (qualifying_scope == global_namespace)
8468 error ("invalid use of qualified-name %<::%D%>",
8470 else if (TYPE_P (qualifying_scope))
8471 error ("invalid use of qualified-name %<%T::%D%>",
8472 qualifying_scope, decl);
8474 error ("invalid use of qualified-name %<%D::%D%>",
8475 qualifying_scope, decl);
8476 return error_mark_node;
8478 else if (TYPE_P (qualifying_scope))
8480 ctype = qualifying_scope;
8481 if (!MAYBE_CLASS_TYPE_P (ctype))
8483 error ("%q#T is not a class or a namespace", ctype);
8486 else if (innermost_code != cdk_function
8487 && current_class_type
8488 && !UNIQUELY_DERIVED_FROM_P (ctype,
8489 current_class_type))
8491 error ("type %qT is not derived from type %qT",
8492 ctype, current_class_type);
8493 return error_mark_node;
8496 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8497 in_namespace = qualifying_scope;
8499 switch (TREE_CODE (decl))
8505 if (innermost_code != cdk_function)
8507 error ("declaration of %qD as non-function", decl);
8508 return error_mark_node;
8510 else if (!qualifying_scope
8511 && !(current_class_type && at_class_scope_p ()))
8513 error ("declaration of %qD as non-member", decl);
8514 return error_mark_node;
8517 type = TREE_OPERAND (decl, 0);
8519 type = constructor_name (type);
8520 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8525 case TEMPLATE_ID_EXPR:
8527 tree fns = TREE_OPERAND (decl, 0);
8530 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8532 gcc_assert (is_overloaded_fn (dname));
8533 dname = DECL_NAME (get_first_fn (dname));
8538 case IDENTIFIER_NODE:
8539 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8542 if (C_IS_RESERVED_WORD (dname))
8544 error ("declarator-id missing; using reserved word %qD",
8546 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8548 else if (!IDENTIFIER_TYPENAME_P (dname))
8549 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8552 gcc_assert (flags == NO_SPECIAL);
8553 flags = TYPENAME_FLAG;
8554 ctor_return_type = TREE_TYPE (dname);
8555 sfk = sfk_conversion;
8556 if (is_typename_at_global_scope (dname))
8557 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8559 name = "<invalid operator>";
8576 return error_mark_node;
8581 if (id_declarator->kind == cdk_id)
8587 The declarator in a function-definition shall have the form
8588 D1 ( parameter-declaration-clause) ... */
8589 if (funcdef_flag && innermost_code != cdk_function)
8591 error ("function definition does not declare parameters");
8592 return error_mark_node;
8595 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8596 && innermost_code != cdk_function
8597 && ! (ctype && !declspecs->any_specifiers_p))
8599 error ("declaration of %qD as non-function", dname);
8600 return error_mark_node;
8604 && TREE_CODE (dname) == IDENTIFIER_NODE
8605 && UDLIT_OPER_P (dname)
8606 && innermost_code != cdk_function)
8608 error ("declaration of %qD as non-function", dname);
8609 return error_mark_node;
8612 if (dname && IDENTIFIER_OPNAME_P (dname))
8614 if (declspecs->specs[(int)ds_typedef])
8616 error ("declaration of %qD as %<typedef%>", dname);
8617 return error_mark_node;
8619 else if (decl_context == PARM || decl_context == CATCHPARM)
8621 error ("declaration of %qD as parameter", dname);
8622 return error_mark_node;
8626 /* Anything declared one level down from the top level
8627 must be one of the parameters of a function
8628 (because the body is at least two levels down). */
8630 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8631 by not allowing C++ class definitions to specify their parameters
8632 with xdecls (must be spec.d in the parmlist).
8634 Since we now wait to push a class scope until we are sure that
8635 we are in a legitimate method context, we must set oldcname
8636 explicitly (since current_class_name is not yet alive).
8638 We also want to avoid calling this a PARM if it is in a namespace. */
8640 if (decl_context == NORMAL && !toplevel_bindings_p ())
8642 cp_binding_level *b = current_binding_level;
8643 current_binding_level = b->level_chain;
8644 if (current_binding_level != 0 && toplevel_bindings_p ())
8645 decl_context = PARM;
8646 current_binding_level = b;
8650 name = decl_context == PARM ? "parameter" : "type name";
8652 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8654 error ("%<constexpr%> cannot appear in a typedef declaration");
8655 return error_mark_node;
8658 /* If there were multiple types specified in the decl-specifier-seq,
8659 issue an error message. */
8660 if (declspecs->multiple_types_p)
8662 error ("two or more data types in declaration of %qs", name);
8663 return error_mark_node;
8666 if (declspecs->conflicting_specifiers_p)
8668 error ("conflicting specifiers in declaration of %qs", name);
8669 return error_mark_node;
8672 /* Extract the basic type from the decl-specifier-seq. */
8673 type = declspecs->type;
8674 if (type == error_mark_node)
8677 type_was_error_mark_node = true;
8679 /* If the entire declaration is itself tagged as deprecated then
8680 suppress reports of deprecated items. */
8681 if (type && TREE_DEPRECATED (type)
8682 && deprecated_state != DEPRECATED_SUPPRESS)
8683 warn_deprecated_use (type, NULL_TREE);
8684 if (type && TREE_CODE (type) == TYPE_DECL)
8686 typedef_decl = type;
8687 type = TREE_TYPE (typedef_decl);
8688 if (TREE_DEPRECATED (type)
8689 && DECL_ARTIFICIAL (typedef_decl)
8690 && deprecated_state != DEPRECATED_SUPPRESS)
8691 warn_deprecated_use (type, NULL_TREE);
8693 /* No type at all: default to `int', and set DEFAULTED_INT
8694 because it was not a user-defined typedef. */
8695 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8697 /* These imply 'int'. */
8698 type = integer_type_node;
8702 explicit_int = declspecs->explicit_int_p;
8703 explicit_char = declspecs->explicit_char_p;
8706 /* See the code below that used this. */
8708 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8710 typedef_type = type;
8713 if (sfk != sfk_conversion)
8714 ctor_return_type = ctype;
8716 if (sfk != sfk_none)
8717 type = check_special_function_return_type (sfk, type,
8719 else if (type == NULL_TREE)
8725 /* We handle `main' specially here, because 'main () { }' is so
8726 common. With no options, it is allowed. With -Wreturn-type,
8727 it is a warning. It is only an error with -pedantic-errors. */
8728 is_main = (funcdef_flag
8729 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8730 && MAIN_NAME_P (dname)
8731 && ctype == NULL_TREE
8732 && in_namespace == NULL_TREE
8733 && current_namespace == global_namespace);
8735 if (type_was_error_mark_node)
8736 /* We've already issued an error, don't complain more. */;
8737 else if (in_system_header || flag_ms_extensions)
8738 /* Allow it, sigh. */;
8740 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8742 pedwarn (input_location, OPT_pedantic,
8743 "ISO C++ forbids declaration of %qs with no type", name);
8745 warning (OPT_Wreturn_type,
8746 "ISO C++ forbids declaration of %qs with no type", name);
8748 type = integer_type_node;
8753 if (explicit_int128)
8755 if (int128_integer_type_node == NULL_TREE)
8757 error ("%<__int128%> is not supported by this target");
8758 explicit_int128 = false;
8760 else if (pedantic && ! in_system_header)
8761 pedwarn (input_location, OPT_pedantic,
8762 "ISO C++ does not support %<__int128%> for %qs", name);
8765 /* Now process the modifiers that were specified
8766 and check for invalid combinations. */
8768 /* Long double is a special combination. */
8769 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8772 type = cp_build_qualified_type (long_double_type_node,
8773 cp_type_quals (type));
8776 /* Check all other uses of type modifiers. */
8778 if (unsigned_p || signed_p || long_p || short_p)
8782 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8783 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8784 else if (signed_p && unsigned_p)
8785 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8786 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8787 error ("%<long long%> invalid for %qs", name);
8788 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8789 error ("%<long%> invalid for %qs", name);
8790 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8791 error ("%<short%> invalid for %qs", name);
8792 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8793 error ("%<long%> or %<short%> invalid for %qs", name);
8794 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8795 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8796 else if ((long_p || short_p) && explicit_char)
8797 error ("%<long%> or %<short%> specified with char for %qs", name);
8798 else if (long_p && short_p)
8799 error ("%<long%> and %<short%> specified together for %qs", name);
8800 else if (type == char16_type_node || type == char32_type_node)
8802 if (signed_p || unsigned_p)
8803 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8804 else if (short_p || long_p)
8805 error ("%<short%> or %<long%> invalid for %qs", name);
8810 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8812 pedwarn (input_location, OPT_pedantic,
8813 "long, short, signed or unsigned used invalidly for %qs",
8815 if (flag_pedantic_errors)
8820 /* Discard the type modifiers if they are invalid. */
8831 /* Decide whether an integer type is signed or not.
8832 Optionally treat bitfields as signed by default. */
8836 It is implementation-defined whether a plain (neither
8837 explicitly signed or unsigned) char, short, int, or long
8838 bit-field is signed or unsigned.
8840 Naturally, we extend this to long long as well. Note that
8841 this does not include wchar_t. */
8842 || (bitfield && !flag_signed_bitfields
8844 /* A typedef for plain `int' without `signed' can be
8845 controlled just like plain `int', but a typedef for
8846 `signed int' cannot be so controlled. */
8848 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8849 && TREE_CODE (type) == INTEGER_TYPE
8850 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8852 if (explicit_int128)
8853 type = int128_unsigned_type_node;
8855 type = long_long_unsigned_type_node;
8857 type = long_unsigned_type_node;
8859 type = short_unsigned_type_node;
8860 else if (type == char_type_node)
8861 type = unsigned_char_type_node;
8862 else if (typedef_decl)
8863 type = unsigned_type_for (type);
8865 type = unsigned_type_node;
8867 else if (signed_p && type == char_type_node)
8868 type = signed_char_type_node;
8869 else if (explicit_int128)
8870 type = int128_integer_type_node;
8872 type = long_long_integer_type_node;
8874 type = long_integer_type_node;
8876 type = short_integer_type_node;
8878 if (declspecs->specs[(int)ds_complex])
8880 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8881 error ("complex invalid for %qs", name);
8882 /* If we just have "complex", it is equivalent to
8883 "complex double", but if any modifiers at all are specified it is
8884 the complex form of TYPE. E.g, "complex short" is
8885 "complex short int". */
8886 else if (defaulted_int && ! longlong && ! explicit_int128
8887 && ! (long_p || short_p || signed_p || unsigned_p))
8888 type = complex_double_type_node;
8889 else if (type == integer_type_node)
8890 type = complex_integer_type_node;
8891 else if (type == float_type_node)
8892 type = complex_float_type_node;
8893 else if (type == double_type_node)
8894 type = complex_double_type_node;
8895 else if (type == long_double_type_node)
8896 type = complex_long_double_type_node;
8898 type = build_complex_type (type);
8901 type_quals = TYPE_UNQUALIFIED;
8902 if (declspecs->specs[(int)ds_const])
8903 type_quals |= TYPE_QUAL_CONST;
8904 if (declspecs->specs[(int)ds_volatile])
8905 type_quals |= TYPE_QUAL_VOLATILE;
8906 if (declspecs->specs[(int)ds_restrict])
8907 type_quals |= TYPE_QUAL_RESTRICT;
8908 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8909 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8912 type_quals |= cp_type_quals (type);
8913 type = cp_build_qualified_type_real
8914 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8915 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8916 /* We might have ignored or rejected some of the qualifiers. */
8917 type_quals = cp_type_quals (type);
8920 inlinep = !! declspecs->specs[(int)ds_inline];
8921 virtualp = !! declspecs->specs[(int)ds_virtual];
8922 explicitp = !! declspecs->specs[(int)ds_explicit];
8924 storage_class = declspecs->storage_class;
8925 if (storage_class == sc_static)
8926 staticp = 1 + (decl_context == FIELD);
8928 if (virtualp && staticp == 2)
8930 error ("member %qD cannot be declared both virtual and static", dname);
8931 storage_class = sc_none;
8934 friendp = !! declspecs->specs[(int)ds_friend];
8936 if (dependent_name && !friendp)
8938 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8939 return error_mark_node;
8942 /* Issue errors about use of storage classes for parameters. */
8943 if (decl_context == PARM)
8945 if (declspecs->specs[(int)ds_typedef])
8947 error ("typedef declaration invalid in parameter declaration");
8948 return error_mark_node;
8950 else if (template_parm_flag && storage_class != sc_none)
8952 error ("storage class specified for template parameter %qs", name);
8953 return error_mark_node;
8955 else if (storage_class == sc_static
8956 || storage_class == sc_extern
8958 error ("storage class specifiers invalid in parameter declarations");
8960 /* Function parameters cannot be constexpr. If we saw one, moan
8961 and pretend it wasn't there. */
8964 error ("a parameter cannot be declared %<constexpr%>");
8969 /* Give error if `virtual' is used outside of class declaration. */
8971 && (current_class_name == NULL_TREE || decl_context != FIELD))
8973 error ("%<virtual%> outside class declaration");
8977 /* Static anonymous unions are dealt with here. */
8978 if (staticp && decl_context == TYPENAME
8980 && ANON_AGGR_TYPE_P (declspecs->type))
8981 decl_context = FIELD;
8983 /* Warn about storage classes that are invalid for certain
8984 kinds of declarations (parameters, typenames, etc.). */
8987 && storage_class != sc_extern
8988 && storage_class != sc_static)
8989 || declspecs->specs[(int)ds_typedef]))
8991 error ("multiple storage classes in declaration of %qs", name);
8994 if (decl_context != NORMAL
8995 && ((storage_class != sc_none
8996 && storage_class != sc_mutable)
8999 if ((decl_context == PARM || decl_context == CATCHPARM)
9000 && (storage_class == sc_register
9001 || storage_class == sc_auto))
9003 else if (declspecs->specs[(int)ds_typedef])
9005 else if (decl_context == FIELD
9006 /* C++ allows static class elements. */
9007 && storage_class == sc_static)
9008 /* C++ also allows inlines and signed and unsigned elements,
9009 but in those cases we don't come in here. */
9013 if (decl_context == FIELD)
9014 error ("storage class specified for %qs", name);
9017 if (decl_context == PARM || decl_context == CATCHPARM)
9018 error ("storage class specified for parameter %qs", name);
9020 error ("storage class specified for typename");
9022 if (storage_class == sc_register
9023 || storage_class == sc_auto
9024 || storage_class == sc_extern
9026 storage_class = sc_none;
9029 else if (storage_class == sc_extern && funcdef_flag
9030 && ! toplevel_bindings_p ())
9031 error ("nested function %qs declared %<extern%>", name);
9032 else if (toplevel_bindings_p ())
9034 if (storage_class == sc_auto)
9035 error ("top-level declaration of %qs specifies %<auto%>", name);
9038 && storage_class != sc_extern
9039 && storage_class != sc_static)
9041 error ("function-scope %qs implicitly auto and declared %<__thread%>",
9046 if (storage_class && friendp)
9048 error ("storage class specifiers invalid in friend function declarations");
9049 storage_class = sc_none;
9054 unqualified_id = NULL_TREE;
9057 unqualified_id = id_declarator->u.id.unqualified_name;
9058 switch (TREE_CODE (unqualified_id))
9061 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9062 if (TYPE_P (unqualified_id))
9063 unqualified_id = constructor_name (unqualified_id);
9066 case IDENTIFIER_NODE:
9067 case TEMPLATE_ID_EXPR:
9075 /* Determine the type of the entity declared by recurring on the
9077 for (; declarator; declarator = declarator->declarator)
9079 const cp_declarator *inner_declarator;
9082 if (type == error_mark_node)
9083 return error_mark_node;
9085 attrs = declarator->attributes;
9091 if (declarator == NULL || declarator->kind == cdk_id)
9092 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9093 if (declarator->kind == cdk_function)
9094 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9095 if (declarator->kind == cdk_array)
9096 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9097 returned_attrs = decl_attributes (&type,
9098 chainon (returned_attrs, attrs),
9102 if (declarator->kind == cdk_id)
9105 inner_declarator = declarator->declarator;
9107 switch (declarator->kind)
9110 type = create_array_type_for_decl (dname, type,
9111 declarator->u.array.bounds);
9119 /* Declaring a function type.
9120 Make sure we have a valid type for the function to return. */
9122 if (type_quals != TYPE_UNQUALIFIED)
9124 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9125 warning (OPT_Wignored_qualifiers,
9126 "type qualifiers ignored on function return type");
9127 /* We now know that the TYPE_QUALS don't apply to the
9128 decl, but to its return type. */
9129 type_quals = TYPE_UNQUALIFIED;
9131 errmsg = targetm.invalid_return_type (type);
9135 type = integer_type_node;
9138 /* Error about some types functions can't return. */
9140 if (TREE_CODE (type) == FUNCTION_TYPE)
9142 error ("%qs declared as function returning a function", name);
9143 return error_mark_node;
9145 if (TREE_CODE (type) == ARRAY_TYPE)
9147 error ("%qs declared as function returning an array", name);
9148 return error_mark_node;
9151 /* Pick up type qualifiers which should be applied to `this'. */
9152 memfn_quals = declarator->u.function.qualifiers;
9153 /* Pick up virt-specifiers. */
9154 virt_specifiers = declarator->u.function.virt_specifiers;
9155 /* Pick up the exception specifications. */
9156 raises = declarator->u.function.exception_specification;
9157 /* If the exception-specification is ill-formed, let's pretend
9158 there wasn't one. */
9159 if (raises == error_mark_node)
9162 /* Say it's a definition only for the CALL_EXPR
9163 closest to the identifier. */
9164 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9166 /* Handle a late-specified return type. */
9169 if (type_uses_auto (type))
9171 if (!declarator->u.function.late_return_type)
9173 error ("%qs function uses %<auto%> type specifier without"
9174 " trailing return type", name);
9175 return error_mark_node;
9177 else if (!is_auto (type))
9179 error ("%qs function with trailing return type has"
9180 " %qT as its type rather than plain %<auto%>",
9182 return error_mark_node;
9185 else if (declarator->u.function.late_return_type)
9187 if (cxx_dialect < cxx0x)
9188 /* Not using maybe_warn_cpp0x because this should
9189 always be an error. */
9190 error ("trailing return type only available with "
9191 "-std=c++11 or -std=gnu++11");
9193 error ("%qs function with trailing return type not "
9194 "declared with %<auto%> type specifier", name);
9195 return error_mark_node;
9198 type = splice_late_return_type
9199 (type, declarator->u.function.late_return_type);
9200 if (type == error_mark_node)
9201 return error_mark_node;
9203 if (ctype == NULL_TREE
9204 && decl_context == FIELD
9206 && (friendp == 0 || dname == current_class_name))
9207 ctype = current_class_type;
9209 if (ctype && (sfk == sfk_constructor
9210 || sfk == sfk_destructor))
9212 /* We are within a class's scope. If our declarator name
9213 is the same as the class name, and we are defining
9214 a function, then it is a constructor/destructor, and
9215 therefore returns a void type. */
9217 /* ISO C++ 12.4/2. A destructor may not be declared
9218 const or volatile. A destructor may not be
9221 ISO C++ 12.1. A constructor may not be declared
9222 const or volatile. A constructor may not be
9223 virtual. A constructor may not be static. */
9225 error ((flags == DTOR_FLAG)
9226 ? G_("destructor cannot be static member function")
9227 : G_("constructor cannot be static member function"));
9230 error ((flags == DTOR_FLAG)
9231 ? G_("destructors may not be cv-qualified")
9232 : G_("constructors may not be cv-qualified"));
9233 memfn_quals = TYPE_UNQUALIFIED;
9236 if (decl_context == FIELD
9237 && !member_function_or_else (ctype,
9240 return error_mark_node;
9242 if (flags != DTOR_FLAG)
9244 /* It's a constructor. */
9249 permerror (input_location, "constructors cannot be declared virtual");
9252 if (decl_context == FIELD
9253 && sfk != sfk_constructor)
9254 return error_mark_node;
9256 if (decl_context == FIELD)
9262 error ("can%'t initialize friend function %qs", name);
9265 /* Cannot be both friend and virtual. */
9266 error ("virtual functions cannot be friends");
9269 if (decl_context == NORMAL)
9270 error ("friend declaration not in class definition");
9271 if (current_function_decl && funcdef_flag)
9272 error ("can%'t define friend function %qs in a local "
9276 else if (ctype && sfk == sfk_conversion)
9280 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9285 arg_types = grokparms (declarator->u.function.parameters,
9288 if (inner_declarator
9289 && inner_declarator->kind == cdk_id
9290 && inner_declarator->u.id.sfk == sfk_destructor
9291 && arg_types != void_list_node)
9293 error ("destructors may not have parameters");
9294 arg_types = void_list_node;
9298 type = build_function_type (type, arg_types);
9305 /* Filter out pointers-to-references and references-to-references.
9306 We can get these if a TYPE_DECL is used. */
9308 if (TREE_CODE (type) == REFERENCE_TYPE)
9310 if (declarator->kind != cdk_reference)
9312 error ("cannot declare pointer to %q#T", type);
9313 type = TREE_TYPE (type);
9316 /* In C++0x, we allow reference to reference declarations
9317 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9318 and template type arguments [14.3.1/4 temp.arg.type]. The
9319 check for direct reference to reference declarations, which
9320 are still forbidden, occurs below. Reasoning behind the change
9321 can be found in DR106, DR540, and the rvalue reference
9323 else if (cxx_dialect == cxx98)
9325 error ("cannot declare reference to %q#T", type);
9326 type = TREE_TYPE (type);
9329 else if (VOID_TYPE_P (type))
9331 if (declarator->kind == cdk_reference)
9332 error ("cannot declare reference to %q#T", type);
9333 else if (declarator->kind == cdk_ptrmem)
9334 error ("cannot declare pointer to %q#T member", type);
9337 /* We now know that the TYPE_QUALS don't apply to the decl,
9338 but to the target of the pointer. */
9339 type_quals = TYPE_UNQUALIFIED;
9341 if (declarator->kind == cdk_ptrmem
9342 && (TREE_CODE (type) == FUNCTION_TYPE
9343 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9345 memfn_quals |= type_memfn_quals (type);
9346 type = build_memfn_type (type,
9347 declarator->u.pointer.class_type,
9349 if (type == error_mark_node)
9350 return error_mark_node;
9351 memfn_quals = TYPE_UNQUALIFIED;
9354 if (TREE_CODE (type) == FUNCTION_TYPE
9355 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9356 error (declarator->kind == cdk_reference
9357 ? G_("cannot declare reference to qualified function type %qT")
9358 : G_("cannot declare pointer to qualified function type %qT"),
9361 /* When the pointed-to type involves components of variable size,
9362 care must be taken to ensure that the size evaluation code is
9363 emitted early enough to dominate all the possible later uses
9364 and late enough for the variables on which it depends to have
9367 This is expected to happen automatically when the pointed-to
9368 type has a name/declaration of it's own, but special attention
9369 is required if the type is anonymous.
9371 We handle the NORMAL and FIELD contexts here by inserting a
9372 dummy statement that just evaluates the size at a safe point
9373 and ensures it is not deferred until e.g. within a deeper
9374 conditional context (c++/43555).
9376 We expect nothing to be needed here for PARM or TYPENAME.
9377 Evaluating the size at this point for TYPENAME would
9378 actually be incorrect, as we might be in the middle of an
9379 expression with side effects on the pointed-to type size
9380 "arguments" prior to the pointer declaration point and the
9381 size evaluation could end up prior to the side effects. */
9383 if (!TYPE_NAME (type)
9384 && (decl_context == NORMAL || decl_context == FIELD)
9385 && at_function_scope_p ()
9386 && variably_modified_type_p (type, NULL_TREE))
9388 /* First break out any side-effects. */
9389 stabilize_vla_size (TYPE_SIZE (type));
9390 /* And then force evaluation of the SAVE_EXPR. */
9391 finish_expr_stmt (TYPE_SIZE (type));
9394 if (declarator->kind == cdk_reference)
9396 /* In C++0x, the type we are creating a reference to might be
9397 a typedef which is itself a reference type. In that case,
9398 we follow the reference collapsing rules in
9399 [7.1.3/8 dcl.typedef] to create the final reference type:
9401 "If a typedef TD names a type that is a reference to a type
9402 T, an attempt to create the type 'lvalue reference to cv TD'
9403 creates the type 'lvalue reference to T,' while an attempt
9404 to create the type "rvalue reference to cv TD' creates the
9407 if (VOID_TYPE_P (type))
9408 /* We already gave an error. */;
9409 else if (TREE_CODE (type) == REFERENCE_TYPE)
9411 if (declarator->u.reference.rvalue_ref)
9412 /* Leave type alone. */;
9414 type = cp_build_reference_type (TREE_TYPE (type), false);
9417 type = cp_build_reference_type
9418 (type, declarator->u.reference.rvalue_ref);
9420 /* In C++0x, we need this check for direct reference to
9421 reference declarations, which are forbidden by
9422 [8.3.2/5 dcl.ref]. Reference to reference declarations
9423 are only allowed indirectly through typedefs and template
9424 type arguments. Example:
9426 void foo(int & &); // invalid ref-to-ref decl
9428 typedef int & int_ref;
9429 void foo(int_ref &); // valid ref-to-ref decl
9431 if (inner_declarator && inner_declarator->kind == cdk_reference)
9432 error ("cannot declare reference to %q#T, which is not "
9433 "a typedef or a template type argument", type);
9435 else if (TREE_CODE (type) == METHOD_TYPE)
9436 type = build_ptrmemfunc_type (build_pointer_type (type));
9437 else if (declarator->kind == cdk_ptrmem)
9439 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9441 if (declarator->u.pointer.class_type == error_mark_node)
9442 /* We will already have complained. */
9443 type = error_mark_node;
9445 type = build_ptrmem_type (declarator->u.pointer.class_type,
9449 type = build_pointer_type (type);
9451 /* Process a list of type modifier keywords (such as
9452 const or volatile) that were given inside the `*' or `&'. */
9454 if (declarator->u.pointer.qualifiers)
9457 = cp_build_qualified_type (type,
9458 declarator->u.pointer.qualifiers);
9459 type_quals = cp_type_quals (type);
9472 /* We need to stabilize side-effects in VLA sizes for regular array
9473 declarations too, not just pointers to arrays. */
9474 if (type != error_mark_node && !TYPE_NAME (type)
9475 && (decl_context == NORMAL || decl_context == FIELD)
9476 && at_function_scope_p ()
9477 && variably_modified_type_p (type, NULL_TREE))
9478 stabilize_vla_size (TYPE_SIZE (type));
9480 /* A `constexpr' specifier used in an object declaration declares
9481 the object as `const'. */
9482 if (constexpr_p && innermost_code != cdk_function)
9484 if (type_quals & TYPE_QUAL_CONST)
9485 error ("both %<const%> and %<constexpr%> cannot be used here");
9486 if (type_quals & TYPE_QUAL_VOLATILE)
9487 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9488 if (TREE_CODE (type) != REFERENCE_TYPE)
9490 type_quals |= TYPE_QUAL_CONST;
9491 type = cp_build_qualified_type (type, type_quals);
9495 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9496 && TREE_CODE (type) != FUNCTION_TYPE
9497 && TREE_CODE (type) != METHOD_TYPE)
9499 error ("template-id %qD used as a declarator",
9501 unqualified_id = dname;
9504 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9505 qualified with a class-name, turn it into a METHOD_TYPE, unless
9506 we know that the function is static. We take advantage of this
9507 opportunity to do other processing that pertains to entities
9508 explicitly declared to be class members. Note that if DECLARATOR
9509 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9510 would not have exited the loop above. */
9512 && declarator->u.id.qualifying_scope
9513 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9517 ctype = declarator->u.id.qualifying_scope;
9518 ctype = TYPE_MAIN_VARIANT (ctype);
9520 while (t != NULL_TREE && CLASS_TYPE_P (t))
9522 /* You're supposed to have one `template <...>' for every
9523 template class, but you don't need one for a full
9524 specialization. For example:
9526 template <class T> struct S{};
9527 template <> struct S<int> { void f(); };
9528 void S<int>::f () {}
9530 is correct; there shouldn't be a `template <>' for the
9531 definition of `S<int>::f'. */
9532 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9533 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9534 /* T is an explicit (not partial) specialization. All
9535 containing classes must therefore also be explicitly
9538 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9539 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9540 template_count += 1;
9542 t = TYPE_MAIN_DECL (t);
9543 t = DECL_CONTEXT (t);
9546 if (ctype == current_class_type)
9550 permerror (input_location, "member functions are implicitly friends of their class");
9554 permerror (declarator->id_loc,
9555 "extra qualification %<%T::%> on member %qs",
9558 else if (/* If the qualifying type is already complete, then we
9559 can skip the following checks. */
9560 !COMPLETE_TYPE_P (ctype)
9561 && (/* If the function is being defined, then
9562 qualifying type must certainly be complete. */
9564 /* A friend declaration of "T::f" is OK, even if
9565 "T" is a template parameter. But, if this
9566 function is not a friend, the qualifying type
9568 || (!friendp && !CLASS_TYPE_P (ctype))
9569 /* For a declaration, the type need not be
9570 complete, if either it is dependent (since there
9571 is no meaningful definition of complete in that
9572 case) or the qualifying class is currently being
9574 || !(dependent_type_p (ctype)
9575 || currently_open_class (ctype)))
9576 /* Check that the qualifying type is complete. */
9577 && !complete_type_or_else (ctype, NULL_TREE))
9578 return error_mark_node;
9579 else if (TREE_CODE (type) == FUNCTION_TYPE)
9581 if (current_class_type
9582 && (!friendp || funcdef_flag))
9585 ? G_("cannot define member function %<%T::%s%> "
9587 : G_("cannot declare member function %<%T::%s%> "
9589 ctype, name, current_class_type);
9590 return error_mark_node;
9593 else if (declspecs->specs[(int)ds_typedef]
9594 && current_class_type)
9596 error ("cannot declare member %<%T::%s%> within %qT",
9597 ctype, name, current_class_type);
9598 return error_mark_node;
9602 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9603 ctype = current_class_type;
9605 /* Now TYPE has the actual type. */
9610 *attrlist = chainon (returned_attrs, *attrlist);
9612 attrlist = &returned_attrs;
9615 /* Handle parameter packs. */
9616 if (parameter_pack_p)
9618 if (decl_context == PARM)
9619 /* Turn the type into a pack expansion.*/
9620 type = make_pack_expansion (type);
9622 error ("non-parameter %qs cannot be a parameter pack", name);
9625 /* Did array size calculations overflow? */
9627 if (TREE_CODE (type) == ARRAY_TYPE
9628 && COMPLETE_TYPE_P (type)
9629 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9630 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9632 error ("size of array %qs is too large", name);
9633 /* If we proceed with the array type as it is, we'll eventually
9634 crash in tree_low_cst(). */
9635 type = error_mark_node;
9638 if ((decl_context == FIELD || decl_context == PARM)
9639 && !processing_template_decl
9640 && variably_modified_type_p (type, NULL_TREE))
9642 if (decl_context == FIELD)
9643 error ("data member may not have variably modified type %qT", type);
9645 error ("parameter may not have variably modified type %qT", type);
9646 type = error_mark_node;
9649 if (explicitp == 1 || (explicitp && friendp))
9651 /* [dcl.fct.spec] The explicit specifier shall only be used in
9652 declarations of constructors within a class definition. */
9653 error ("only declarations of constructors can be %<explicit%>");
9657 if (storage_class == sc_mutable)
9659 if (decl_context != FIELD || friendp)
9661 error ("non-member %qs cannot be declared %<mutable%>", name);
9662 storage_class = sc_none;
9664 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9666 error ("non-object member %qs cannot be declared %<mutable%>", name);
9667 storage_class = sc_none;
9669 else if (TREE_CODE (type) == FUNCTION_TYPE
9670 || TREE_CODE (type) == METHOD_TYPE)
9672 error ("function %qs cannot be declared %<mutable%>", name);
9673 storage_class = sc_none;
9677 error ("static %qs cannot be declared %<mutable%>", name);
9678 storage_class = sc_none;
9680 else if (type_quals & TYPE_QUAL_CONST)
9682 error ("const %qs cannot be declared %<mutable%>", name);
9683 storage_class = sc_none;
9685 else if (TREE_CODE (type) == REFERENCE_TYPE)
9687 permerror (input_location, "reference %qs cannot be declared "
9688 "%<mutable%>", name);
9689 storage_class = sc_none;
9693 /* If this is declaring a typedef name, return a TYPE_DECL. */
9694 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9698 /* Note that the grammar rejects storage classes
9699 in typenames, fields or parameters. */
9700 if (current_lang_name == lang_name_java)
9701 TYPE_FOR_JAVA (type) = 1;
9703 /* This declaration:
9705 typedef void f(int) const;
9707 declares a function type which is not a member of any
9708 particular class, but which is cv-qualified; for
9709 example "f S::*" declares a pointer to a const-qualified
9710 member function of S. We record the cv-qualification in the
9712 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9714 type = apply_memfn_quals (type, memfn_quals);
9716 /* We have now dealt with these qualifiers. */
9717 memfn_quals = TYPE_UNQUALIFIED;
9720 if (type_uses_auto (type))
9722 error ("typedef declared %<auto%>");
9723 type = error_mark_node;
9726 if (decl_context == FIELD)
9727 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9729 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9730 if (id_declarator && declarator->u.id.qualifying_scope) {
9731 error_at (DECL_SOURCE_LOCATION (decl),
9732 "typedef name may not be a nested-name-specifier");
9733 TREE_TYPE (decl) = error_mark_node;
9736 if (decl_context != FIELD)
9738 if (!current_function_decl)
9739 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9740 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9741 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9742 (current_function_decl)))
9743 /* The TYPE_DECL is "abstract" because there will be
9744 clones of this constructor/destructor, and there will
9745 be copies of this TYPE_DECL generated in those
9747 DECL_ABSTRACT (decl) = 1;
9749 else if (constructor_name_p (unqualified_id, current_class_type))
9750 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9751 "as enclosing class",
9754 /* If the user declares "typedef struct {...} foo" then the
9755 struct will have an anonymous name. Fill that name in now.
9756 Nothing can refer to it, so nothing needs know about the name
9758 if (type != error_mark_node
9761 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9762 && TYPE_ANONYMOUS_P (type)
9763 && declspecs->type_definition_p
9764 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9768 /* Replace the anonymous name with the real name everywhere. */
9769 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9771 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9772 /* We do not rename the debug info representing the
9773 anonymous tagged type because the standard says in
9774 [dcl.typedef] that the naming applies only for
9775 linkage purposes. */
9776 /*debug_hooks->set_name (t, decl);*/
9777 TYPE_NAME (t) = decl;
9780 if (TYPE_LANG_SPECIFIC (type))
9781 TYPE_WAS_ANONYMOUS (type) = 1;
9783 /* If this is a typedef within a template class, the nested
9784 type is a (non-primary) template. The name for the
9785 template needs updating as well. */
9786 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9787 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9788 = TYPE_IDENTIFIER (type);
9790 /* Adjust linkage now that we aren't anonymous anymore. */
9791 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9792 determine_visibility (TYPE_MAIN_DECL (type));
9794 /* FIXME remangle member functions; member functions of a
9795 type with external linkage have external linkage. */
9799 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9800 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9802 bad_specifiers (decl, BSP_TYPE, virtualp,
9803 memfn_quals != TYPE_UNQUALIFIED,
9804 inlinep, friendp, raises != NULL_TREE);
9806 if (declspecs->specs[(int)ds_alias])
9807 /* Acknowledge that this was written:
9808 `using analias = atype;'. */
9809 TYPE_DECL_ALIAS_P (decl) = 1;
9814 /* Detect the case of an array type of unspecified size
9815 which came, as such, direct from a typedef name.
9816 We must copy the type, so that the array's domain can be
9817 individually set by the object's initializer. */
9819 if (type && typedef_type
9820 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9821 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9822 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9824 /* Detect where we're using a typedef of function type to declare a
9825 function. PARMS will not be set, so we must create it now. */
9827 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9829 tree decls = NULL_TREE;
9832 for (args = TYPE_ARG_TYPES (type);
9833 args && args != void_list_node;
9834 args = TREE_CHAIN (args))
9836 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9838 DECL_CHAIN (decl) = decls;
9842 parms = nreverse (decls);
9844 if (decl_context != TYPENAME)
9846 /* A cv-qualifier-seq shall only be part of the function type
9847 for a non-static member function. [8.3.5/4 dcl.fct] */
9848 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9849 && (current_class_type == NULL_TREE || staticp) )
9852 ? G_("qualified function types cannot be used to "
9853 "declare static member functions")
9854 : G_("qualified function types cannot be used to "
9855 "declare free functions"));
9856 type = TYPE_MAIN_VARIANT (type);
9859 /* The qualifiers on the function type become the qualifiers on
9860 the non-static member function. */
9861 memfn_quals |= type_memfn_quals (type);
9862 type_quals = TYPE_UNQUALIFIED;
9866 /* If this is a type name (such as, in a cast or sizeof),
9867 compute the type and return it now. */
9869 if (decl_context == TYPENAME)
9871 /* Note that the grammar rejects storage classes
9872 in typenames, fields or parameters. */
9873 if (type_quals != TYPE_UNQUALIFIED)
9874 type_quals = TYPE_UNQUALIFIED;
9876 /* Special case: "friend class foo" looks like a TYPENAME context. */
9879 if (type_quals != TYPE_UNQUALIFIED)
9881 error ("type qualifiers specified for friend class declaration");
9882 type_quals = TYPE_UNQUALIFIED;
9886 error ("%<inline%> specified for friend class declaration");
9892 /* Don't allow friend declaration without a class-key. */
9893 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9894 permerror (input_location, "template parameters cannot be friends");
9895 else if (TREE_CODE (type) == TYPENAME_TYPE)
9896 permerror (input_location, "friend declaration requires class-key, "
9897 "i.e. %<friend class %T::%D%>",
9898 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9900 permerror (input_location, "friend declaration requires class-key, "
9901 "i.e. %<friend %#T%>",
9905 /* Only try to do this stuff if we didn't already give up. */
9906 if (type != integer_type_node)
9908 /* A friendly class? */
9909 if (current_class_type)
9910 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9913 error ("trying to make class %qT a friend of global scope",
9916 type = void_type_node;
9919 else if (memfn_quals)
9921 if (ctype == NULL_TREE
9922 && TREE_CODE (type) == METHOD_TYPE)
9923 ctype = TYPE_METHOD_BASETYPE (type);
9926 type = build_memfn_type (type, ctype, memfn_quals);
9927 /* Core issue #547: need to allow this in template type args. */
9928 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9929 type = apply_memfn_quals (type, memfn_quals);
9931 error ("invalid qualifiers on non-member function type");
9936 else if (unqualified_id == NULL_TREE && decl_context != PARM
9937 && decl_context != CATCHPARM
9938 && TREE_CODE (type) != UNION_TYPE
9941 error ("abstract declarator %qT used as declaration", type);
9942 return error_mark_node;
9945 /* Only functions may be declared using an operator-function-id. */
9947 && IDENTIFIER_OPNAME_P (unqualified_id)
9948 && TREE_CODE (type) != FUNCTION_TYPE
9949 && TREE_CODE (type) != METHOD_TYPE)
9951 error ("declaration of %qD as non-function", unqualified_id);
9952 return error_mark_node;
9955 /* We don't check parameter types here because we can emit a better
9956 error message later. */
9957 if (decl_context != PARM)
9959 type = check_var_type (unqualified_id, type);
9960 if (type == error_mark_node)
9961 return error_mark_node;
9964 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9965 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9967 if (decl_context == PARM || decl_context == CATCHPARM)
9969 if (ctype || in_namespace)
9970 error ("cannot use %<::%> in parameter declaration");
9972 if (type_uses_auto (type))
9974 error ("parameter declared %<auto%>");
9975 type = error_mark_node;
9978 /* A parameter declared as an array of T is really a pointer to T.
9979 One declared as a function is really a pointer to a function.
9980 One declared as a member is really a pointer to member. */
9982 if (TREE_CODE (type) == ARRAY_TYPE)
9984 /* Transfer const-ness of array into that of type pointed to. */
9985 type = build_pointer_type (TREE_TYPE (type));
9986 type_quals = TYPE_UNQUALIFIED;
9988 else if (TREE_CODE (type) == FUNCTION_TYPE)
9989 type = build_pointer_type (type);
9992 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9993 && !NEW_DELETE_OPNAME_P (unqualified_id))
9995 cp_cv_quals real_quals = memfn_quals;
9996 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9997 real_quals |= TYPE_QUAL_CONST;
9998 type = build_memfn_type (type, ctype, real_quals);
10004 if (decl_context == PARM)
10006 decl = cp_build_parm_decl (unqualified_id, type);
10008 bad_specifiers (decl, BSP_PARM, virtualp,
10009 memfn_quals != TYPE_UNQUALIFIED,
10010 inlinep, friendp, raises != NULL_TREE);
10012 else if (decl_context == FIELD)
10014 if (!staticp && type_uses_auto (type))
10016 error ("non-static data member declared %<auto%>");
10017 type = error_mark_node;
10020 /* The C99 flexible array extension. */
10021 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10022 && TYPE_DOMAIN (type) == NULL_TREE)
10024 tree itype = compute_array_index_type (dname, integer_zero_node,
10025 tf_warning_or_error);
10026 type = build_cplus_array_type (TREE_TYPE (type), itype);
10029 if (type == error_mark_node)
10031 /* Happens when declaring arrays of sizes which
10032 are error_mark_node, for example. */
10035 else if (in_namespace && !friendp)
10037 /* Something like struct S { int N::j; }; */
10038 error ("invalid use of %<::%>");
10039 return error_mark_node;
10041 else if (TREE_CODE (type) == FUNCTION_TYPE
10042 || TREE_CODE (type) == METHOD_TYPE)
10045 tree function_context;
10049 /* This should never happen in pure C++ (the check
10050 could be an assert). It could happen in
10051 Objective-C++ if someone writes invalid code that
10052 uses a function declaration for an instance
10053 variable or property (instance variables and
10054 properties are parsed as FIELD_DECLs, but they are
10055 part of an Objective-C class, not a C++ class).
10056 That code is invalid and is caught by this
10060 error ("declaration of function %qD in invalid context",
10062 return error_mark_node;
10065 /* ``A union may [ ... ] not [ have ] virtual functions.''
10067 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10069 error ("function %qD declared virtual inside a union",
10071 return error_mark_node;
10074 if (NEW_DELETE_OPNAME_P (unqualified_id))
10078 error ("%qD cannot be declared virtual, since it "
10079 "is always static",
10086 /* Check that the name used for a destructor makes sense. */
10087 if (sfk == sfk_destructor)
10089 tree uqname = id_declarator->u.id.unqualified_name;
10093 gcc_assert (friendp);
10094 error ("expected qualified name in friend declaration "
10095 "for destructor %qD", uqname);
10096 return error_mark_node;
10099 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10101 error ("declaration of %qD as member of %qT",
10103 return error_mark_node;
10107 error ("a destructor cannot be %<constexpr%>");
10108 return error_mark_node;
10111 else if (sfk == sfk_constructor && friendp && !ctype)
10113 error ("expected qualified name in friend declaration "
10114 "for constructor %qD",
10115 id_declarator->u.id.unqualified_name);
10116 return error_mark_node;
10119 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10120 function_context = (ctype != NULL_TREE) ?
10121 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10122 publicp = (! friendp || ! staticp)
10123 && function_context == NULL_TREE;
10124 decl = grokfndecl (ctype, type,
10125 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10126 ? unqualified_id : dname,
10129 virtualp, flags, memfn_quals, raises,
10130 friendp ? -1 : 0, friendp, publicp,
10131 inlinep | (2 * constexpr_p),
10133 funcdef_flag, template_count, in_namespace,
10134 attrlist, declarator->id_loc);
10135 decl = set_virt_specifiers (decl, virt_specifiers);
10136 if (decl == NULL_TREE)
10137 return error_mark_node;
10139 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10140 /* The decl and setting of decl_attr is also turned off. */
10141 decl = build_decl_attribute_variant (decl, decl_attr);
10144 /* [class.conv.ctor]
10146 A constructor declared without the function-specifier
10147 explicit that can be called with a single parameter
10148 specifies a conversion from the type of its first
10149 parameter to the type of its class. Such a constructor
10150 is called a converting constructor. */
10151 if (explicitp == 2)
10152 DECL_NONCONVERTING_P (decl) = 1;
10154 else if (!staticp && !dependent_type_p (type)
10155 && !COMPLETE_TYPE_P (complete_type (type))
10156 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10158 if (unqualified_id)
10159 error ("field %qD has incomplete type", unqualified_id);
10161 error ("name %qT has incomplete type", type);
10163 /* If we're instantiating a template, tell them which
10164 instantiation made the field's type be incomplete. */
10165 if (current_class_type
10166 && TYPE_NAME (current_class_type)
10167 && IDENTIFIER_TEMPLATE (current_class_name)
10169 && declspecs->type == type)
10170 error (" in instantiation of template %qT",
10171 current_class_type);
10173 return error_mark_node;
10179 error ("%qE is neither function nor member function; "
10180 "cannot be declared friend", unqualified_id);
10188 /* Friends are treated specially. */
10189 if (ctype == current_class_type)
10190 ; /* We already issued a permerror. */
10191 else if (decl && DECL_NAME (decl))
10193 if (template_class_depth (current_class_type) == 0)
10195 decl = check_explicit_specialization
10196 (unqualified_id, decl, template_count,
10197 2 * funcdef_flag + 4);
10198 if (decl == error_mark_node)
10199 return error_mark_node;
10202 decl = do_friend (ctype, unqualified_id, decl,
10208 return error_mark_node;
10211 /* Structure field. It may not be a function, except for C++. */
10213 if (decl == NULL_TREE)
10217 /* C++ allows static class members. All other work
10218 for this is done by grokfield. */
10219 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10220 set_linkage_for_static_data_member (decl);
10221 /* Even if there is an in-class initialization, DECL
10222 is considered undefined until an out-of-class
10223 definition is provided. */
10224 DECL_EXTERNAL (decl) = 1;
10227 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10229 if (constexpr_p && !initialized)
10231 error ("constexpr static data member %qD must have an "
10232 "initializer", decl);
10233 constexpr_p = false;
10240 error ("non-static data member %qE declared %<constexpr%>",
10242 constexpr_p = false;
10244 decl = build_decl (input_location,
10245 FIELD_DECL, unqualified_id, type);
10246 DECL_NONADDRESSABLE_P (decl) = bitfield;
10247 if (bitfield && !unqualified_id)
10248 TREE_NO_WARNING (decl) = 1;
10250 if (storage_class == sc_mutable)
10252 DECL_MUTABLE_P (decl) = 1;
10253 storage_class = sc_none;
10258 /* An attempt is being made to initialize a non-static
10259 member. This is new in C++11. */
10260 maybe_warn_cpp0x (CPP0X_NSDMI);
10262 /* If this has been parsed with static storage class, but
10263 errors forced staticp to be cleared, ensure NSDMI is
10265 if (declspecs->storage_class == sc_static)
10266 DECL_INITIAL (decl) = error_mark_node;
10270 bad_specifiers (decl, BSP_FIELD, virtualp,
10271 memfn_quals != TYPE_UNQUALIFIED,
10272 inlinep, friendp, raises != NULL_TREE);
10275 else if (TREE_CODE (type) == FUNCTION_TYPE
10276 || TREE_CODE (type) == METHOD_TYPE)
10278 tree original_name;
10281 if (!unqualified_id)
10282 return error_mark_node;
10284 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10285 original_name = dname;
10287 original_name = unqualified_id;
10289 if (storage_class == sc_auto)
10290 error ("storage class %<auto%> invalid for function %qs", name);
10291 else if (storage_class == sc_register)
10292 error ("storage class %<register%> invalid for function %qs", name);
10294 error ("storage class %<__thread%> invalid for function %qs", name);
10296 if (virt_specifiers)
10297 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10298 /* Function declaration not at top level.
10299 Storage classes other than `extern' are not allowed
10300 and `extern' makes no difference. */
10301 if (! toplevel_bindings_p ()
10302 && (storage_class == sc_static
10303 || declspecs->specs[(int)ds_inline])
10306 if (storage_class == sc_static)
10307 pedwarn (input_location, OPT_pedantic,
10308 "%<static%> specified invalid for function %qs "
10309 "declared out of global scope", name);
10311 pedwarn (input_location, OPT_pedantic,
10312 "%<inline%> specifier invalid for function %qs "
10313 "declared out of global scope", name);
10316 if (ctype == NULL_TREE)
10320 error ("virtual non-class function %qs", name);
10323 else if (sfk == sfk_constructor
10324 || sfk == sfk_destructor)
10326 error (funcdef_flag
10327 ? G_("%qs defined in a non-class scope")
10328 : G_("%qs declared in a non-class scope"), name);
10333 /* Record presence of `static'. */
10334 publicp = (ctype != NULL_TREE
10335 || storage_class == sc_extern
10336 || storage_class != sc_static);
10338 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10339 virtualp, flags, memfn_quals, raises,
10341 publicp, inlinep | (2 * constexpr_p), sfk,
10343 template_count, in_namespace, attrlist,
10344 declarator->id_loc);
10345 if (decl == NULL_TREE)
10346 return error_mark_node;
10350 int invalid_static = 0;
10352 /* Don't allow a static member function in a class, and forbid
10353 declaring main to be static. */
10354 if (TREE_CODE (type) == METHOD_TYPE)
10356 permerror (input_location, "cannot declare member function %qD to have "
10357 "static linkage", decl);
10358 invalid_static = 1;
10360 else if (current_function_decl)
10362 /* FIXME need arm citation */
10363 error ("cannot declare static function inside another function");
10364 invalid_static = 1;
10367 if (invalid_static)
10370 storage_class = sc_none;
10376 /* It's a variable. */
10378 /* An uninitialized decl with `extern' is a reference. */
10379 decl = grokvardecl (type, unqualified_id,
10382 (type_quals & TYPE_QUAL_CONST) != 0,
10383 ctype ? ctype : in_namespace);
10384 bad_specifiers (decl, BSP_VAR, virtualp,
10385 memfn_quals != TYPE_UNQUALIFIED,
10386 inlinep, friendp, raises != NULL_TREE);
10390 DECL_CONTEXT (decl) = ctype;
10393 permerror (input_location, "%<static%> may not be used when defining "
10394 "(as opposed to declaring) a static data member");
10396 storage_class = sc_none;
10398 if (storage_class == sc_register && TREE_STATIC (decl))
10400 error ("static member %qD declared %<register%>", decl);
10401 storage_class = sc_none;
10403 if (storage_class == sc_extern && pedantic)
10405 pedwarn (input_location, OPT_pedantic,
10406 "cannot explicitly declare member %q#D to have "
10407 "extern linkage", decl);
10408 storage_class = sc_none;
10411 else if (constexpr_p && DECL_EXTERNAL (decl))
10413 error ("declaration of constexpr variable %qD is not a definition",
10415 constexpr_p = false;
10419 if (storage_class == sc_extern && initialized && !funcdef_flag)
10421 if (toplevel_bindings_p ())
10423 /* It's common practice (and completely valid) to have a const
10424 be initialized and declared extern. */
10425 if (!(type_quals & TYPE_QUAL_CONST))
10426 warning (0, "%qs initialized and declared %<extern%>", name);
10430 error ("%qs has both %<extern%> and initializer", name);
10431 return error_mark_node;
10435 /* Record `register' declaration for warnings on &
10436 and in case doing stupid register allocation. */
10438 if (storage_class == sc_register)
10439 DECL_REGISTER (decl) = 1;
10440 else if (storage_class == sc_extern)
10441 DECL_THIS_EXTERN (decl) = 1;
10442 else if (storage_class == sc_static)
10443 DECL_THIS_STATIC (decl) = 1;
10445 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10446 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10447 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10449 /* Record constancy and volatility on the DECL itself . There's
10450 no need to do this when processing a template; we'll do this
10451 for the instantiated declaration based on the type of DECL. */
10452 if (!processing_template_decl)
10453 cp_apply_type_quals_to_decl (type_quals, decl);
10459 /* Subroutine of start_function. Ensure that each of the parameter
10460 types (as listed in PARMS) is complete, as is required for a
10461 function definition. */
10464 require_complete_types_for_parms (tree parms)
10466 for (; parms; parms = DECL_CHAIN (parms))
10468 if (dependent_type_p (TREE_TYPE (parms)))
10470 if (!VOID_TYPE_P (TREE_TYPE (parms))
10471 && complete_type_or_else (TREE_TYPE (parms), parms))
10473 relayout_decl (parms);
10474 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10477 /* grokparms or complete_type_or_else will have already issued
10479 TREE_TYPE (parms) = error_mark_node;
10483 /* Returns nonzero if T is a local variable. */
10486 local_variable_p (const_tree t)
10488 if ((TREE_CODE (t) == VAR_DECL
10489 /* A VAR_DECL with a context that is a _TYPE is a static data
10491 && !TYPE_P (CP_DECL_CONTEXT (t))
10492 /* Any other non-local variable must be at namespace scope. */
10493 && !DECL_NAMESPACE_SCOPE_P (t))
10494 || (TREE_CODE (t) == PARM_DECL))
10500 /* Like local_variable_p, but suitable for use as a tree-walking
10504 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10505 void *data ATTRIBUTE_UNUSED)
10507 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10509 else if (TYPE_P (*tp))
10510 *walk_subtrees = 0;
10516 /* Check that ARG, which is a default-argument expression for a
10517 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10518 something goes wrong. DECL may also be a _TYPE node, rather than a
10519 DECL, if there is no DECL available. */
10522 check_default_argument (tree decl, tree arg)
10527 if (TREE_CODE (arg) == DEFAULT_ARG)
10528 /* We get a DEFAULT_ARG when looking at an in-class declaration
10529 with a default argument. Ignore the argument for now; we'll
10530 deal with it after the class is complete. */
10539 decl_type = TREE_TYPE (decl);
10541 if (arg == error_mark_node
10542 || decl == error_mark_node
10543 || TREE_TYPE (arg) == error_mark_node
10544 || decl_type == error_mark_node)
10545 /* Something already went wrong. There's no need to check
10547 return error_mark_node;
10549 /* [dcl.fct.default]
10551 A default argument expression is implicitly converted to the
10553 if (!TREE_TYPE (arg)
10554 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10557 error ("default argument for %q#D has type %qT",
10558 decl, TREE_TYPE (arg));
10560 error ("default argument for parameter of type %qT has type %qT",
10561 decl_type, TREE_TYPE (arg));
10563 return error_mark_node;
10566 /* [dcl.fct.default]
10568 Local variables shall not be used in default argument
10571 The keyword `this' shall not be used in a default argument of a
10572 member function. */
10573 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10576 error ("default argument %qE uses local variable %qD", arg, var);
10577 return error_mark_node;
10584 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10587 type_is_deprecated (tree type)
10589 enum tree_code code;
10590 if (TREE_DEPRECATED (type))
10592 if (TYPE_NAME (type)
10593 && TREE_DEPRECATED (TYPE_NAME (type)))
10596 /* Do warn about using typedefs to a deprecated class. */
10597 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10598 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10600 code = TREE_CODE (type);
10602 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10603 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10604 || code == METHOD_TYPE || code == ARRAY_TYPE)
10605 return type_is_deprecated (TREE_TYPE (type));
10607 if (TYPE_PTRMEMFUNC_P (type))
10608 return type_is_deprecated
10609 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10614 /* Decode the list of parameter types for a function type.
10615 Given the list of things declared inside the parens,
10616 return a list of types.
10618 If this parameter does not end with an ellipsis, we append
10621 *PARMS is set to the chain of PARM_DECLs created. */
10624 grokparms (tree parmlist, tree *parms)
10626 tree result = NULL_TREE;
10627 tree decls = NULL_TREE;
10631 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10633 tree type = NULL_TREE;
10634 tree init = TREE_PURPOSE (parm);
10635 tree decl = TREE_VALUE (parm);
10636 const char *errmsg;
10638 if (parm == void_list_node)
10641 if (! decl || TREE_TYPE (decl) == error_mark_node)
10644 type = TREE_TYPE (decl);
10645 if (VOID_TYPE_P (type))
10647 if (same_type_p (type, void_type_node)
10648 && DECL_SELF_REFERENCE_P (type)
10649 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10650 /* this is a parmlist of `(void)', which is ok. */
10652 cxx_incomplete_type_error (decl, type);
10653 /* It's not a good idea to actually create parameters of
10654 type `void'; other parts of the compiler assume that a
10655 void type terminates the parameter list. */
10656 type = error_mark_node;
10657 TREE_TYPE (decl) = error_mark_node;
10660 if (type != error_mark_node
10661 && TYPE_FOR_JAVA (type)
10662 && MAYBE_CLASS_TYPE_P (type))
10664 error ("parameter %qD has Java class type", decl);
10665 type = error_mark_node;
10666 TREE_TYPE (decl) = error_mark_node;
10670 if (type != error_mark_node
10671 && (errmsg = targetm.invalid_parameter_type (type)))
10674 type = error_mark_node;
10675 TREE_TYPE (decl) = error_mark_node;
10678 if (type != error_mark_node)
10680 if (deprecated_state != DEPRECATED_SUPPRESS)
10682 tree deptype = type_is_deprecated (type);
10684 warn_deprecated_use (deptype, NULL_TREE);
10687 /* Top-level qualifiers on the parameters are
10688 ignored for function types. */
10689 type = cp_build_qualified_type (type, 0);
10690 if (TREE_CODE (type) == METHOD_TYPE)
10692 error ("parameter %qD invalidly declared method type", decl);
10693 type = build_pointer_type (type);
10694 TREE_TYPE (decl) = type;
10696 else if (abstract_virtuals_error (decl, type))
10697 any_error = 1; /* Seems like a good idea. */
10698 else if (POINTER_TYPE_P (type))
10700 /* [dcl.fct]/6, parameter types cannot contain pointers
10701 (references) to arrays of unknown bound. */
10702 tree t = TREE_TYPE (type);
10703 int ptr = TYPE_PTR_P (type);
10707 if (TYPE_PTR_P (t))
10709 else if (TREE_CODE (t) != ARRAY_TYPE)
10711 else if (!TYPE_DOMAIN (t))
10715 if (TREE_CODE (t) == ARRAY_TYPE)
10717 ? G_("parameter %qD includes pointer to array of "
10718 "unknown bound %qT")
10719 : G_("parameter %qD includes reference to array of "
10720 "unknown bound %qT"),
10726 else if (init && !processing_template_decl)
10727 init = check_default_argument (decl, init);
10730 DECL_CHAIN (decl) = decls;
10732 result = tree_cons (init, type, result);
10734 decls = nreverse (decls);
10735 result = nreverse (result);
10737 result = chainon (result, void_list_node);
10744 /* D is a constructor or overloaded `operator='.
10746 Let T be the class in which D is declared. Then, this function
10749 -1 if D's is an ill-formed constructor or copy assignment operator
10750 whose first parameter is of type `T'.
10751 0 if D is not a copy constructor or copy assignment
10753 1 if D is a copy constructor or copy assignment operator whose
10754 first parameter is a reference to non-const qualified T.
10755 2 if D is a copy constructor or copy assignment operator whose
10756 first parameter is a reference to const qualified T.
10758 This function can be used as a predicate. Positive values indicate
10759 a copy constructor and nonzero values indicate a copy assignment
10763 copy_fn_p (const_tree d)
10769 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10771 if (TREE_CODE (d) == TEMPLATE_DECL
10772 || (DECL_TEMPLATE_INFO (d)
10773 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10774 /* Instantiations of template member functions are never copy
10775 functions. Note that member functions of templated classes are
10776 represented as template functions internally, and we must
10777 accept those as copy functions. */
10780 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10784 arg_type = TREE_VALUE (args);
10785 if (arg_type == error_mark_node)
10788 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10790 /* Pass by value copy assignment operator. */
10793 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10794 && !TYPE_REF_IS_RVALUE (arg_type)
10795 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10797 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10803 args = TREE_CHAIN (args);
10805 if (args && args != void_list_node && !TREE_PURPOSE (args))
10806 /* There are more non-optional args. */
10812 /* D is a constructor or overloaded `operator='.
10814 Let T be the class in which D is declared. Then, this function
10815 returns true when D is a move constructor or move assignment
10816 operator, false otherwise. */
10819 move_fn_p (const_tree d)
10823 bool result = false;
10825 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10827 if (cxx_dialect == cxx98)
10828 /* There are no move constructors if we are in C++98 mode. */
10831 if (TREE_CODE (d) == TEMPLATE_DECL
10832 || (DECL_TEMPLATE_INFO (d)
10833 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10834 /* Instantiations of template member functions are never copy
10835 functions. Note that member functions of templated classes are
10836 represented as template functions internally, and we must
10837 accept those as copy functions. */
10840 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10844 arg_type = TREE_VALUE (args);
10845 if (arg_type == error_mark_node)
10848 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10849 && TYPE_REF_IS_RVALUE (arg_type)
10850 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10854 args = TREE_CHAIN (args);
10856 if (args && args != void_list_node && !TREE_PURPOSE (args))
10857 /* There are more non-optional args. */
10863 /* Remember any special properties of member function DECL. */
10866 grok_special_member_properties (tree decl)
10870 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10873 class_type = DECL_CONTEXT (decl);
10874 if (DECL_CONSTRUCTOR_P (decl))
10876 int ctor = copy_fn_p (decl);
10878 if (!DECL_ARTIFICIAL (decl))
10879 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10885 A non-template constructor for class X is a copy
10886 constructor if its first parameter is of type X&, const
10887 X&, volatile X& or const volatile X&, and either there
10888 are no other parameters or else all other parameters have
10889 default arguments. */
10890 TYPE_HAS_COPY_CTOR (class_type) = 1;
10891 if (user_provided_p (decl))
10892 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10894 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10896 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10898 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10899 if (user_provided_p (decl))
10900 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10902 else if (move_fn_p (decl) && user_provided_p (decl))
10903 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10904 else if (is_list_ctor (decl))
10905 TYPE_HAS_LIST_CTOR (class_type) = 1;
10907 if (DECL_DECLARED_CONSTEXPR_P (decl)
10908 && !copy_fn_p (decl) && !move_fn_p (decl))
10909 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10911 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10915 A non-template assignment operator for class X is a copy
10916 assignment operator if its parameter is of type X, X&, const
10917 X&, volatile X& or const volatile X&. */
10919 int assop = copy_fn_p (decl);
10923 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10924 if (user_provided_p (decl))
10925 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10927 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10929 else if (move_fn_p (decl) && user_provided_p (decl))
10930 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10932 /* Destructors are handled in check_methods. */
10935 /* Check a constructor DECL has the correct form. Complains
10936 if the class has a constructor of the form X(X). */
10939 grok_ctor_properties (const_tree ctype, const_tree decl)
10941 int ctor_parm = copy_fn_p (decl);
10947 A declaration of a constructor for a class X is ill-formed if
10948 its first parameter is of type (optionally cv-qualified) X
10949 and either there are no other parameters or else all other
10950 parameters have default arguments.
10952 We *don't* complain about member template instantiations that
10953 have this form, though; they can occur as we try to decide
10954 what constructor to use during overload resolution. Since
10955 overload resolution will never prefer such a constructor to
10956 the non-template copy constructor (which is either explicitly
10957 or implicitly defined), there's no need to worry about their
10958 existence. Theoretically, they should never even be
10959 instantiated, but that's hard to forestall. */
10960 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10968 /* An operator with this code is unary, but can also be binary. */
10971 ambi_op_p (enum tree_code code)
10973 return (code == INDIRECT_REF
10974 || code == ADDR_EXPR
10975 || code == UNARY_PLUS_EXPR
10976 || code == NEGATE_EXPR
10977 || code == PREINCREMENT_EXPR
10978 || code == PREDECREMENT_EXPR);
10981 /* An operator with this name can only be unary. */
10984 unary_op_p (enum tree_code code)
10986 return (code == TRUTH_NOT_EXPR
10987 || code == BIT_NOT_EXPR
10988 || code == COMPONENT_REF
10989 || code == TYPE_EXPR);
10992 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10993 errors are issued for invalid declarations. */
10996 grok_op_properties (tree decl, bool complain)
10998 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
11000 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
11001 tree name = DECL_NAME (decl);
11002 enum tree_code operator_code;
11007 /* Count the number of arguments and check for ellipsis. */
11008 for (argtype = argtypes, arity = 0;
11009 argtype && argtype != void_list_node;
11010 argtype = TREE_CHAIN (argtype))
11012 ellipsis_p = !argtype;
11014 class_type = DECL_CONTEXT (decl);
11015 if (class_type && !CLASS_TYPE_P (class_type))
11016 class_type = NULL_TREE;
11018 if (DECL_CONV_FN_P (decl))
11019 operator_code = TYPE_EXPR;
11023 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11024 if (ansi_opname (CODE) == name) \
11026 operator_code = (CODE); \
11029 else if (ansi_assopname (CODE) == name) \
11031 operator_code = (CODE); \
11032 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11036 #include "operators.def"
11037 #undef DEF_OPERATOR
11039 gcc_unreachable ();
11042 gcc_assert (operator_code != MAX_TREE_CODES);
11043 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11046 switch (operator_code)
11049 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11053 TYPE_GETS_DELETE (class_type) |= 1;
11057 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11060 case VEC_DELETE_EXPR:
11061 TYPE_GETS_DELETE (class_type) |= 2;
11068 /* [basic.std.dynamic.allocation]/1:
11070 A program is ill-formed if an allocation function is declared
11071 in a namespace scope other than global scope or declared static
11074 The same also holds true for deallocation functions. */
11075 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11076 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11078 if (DECL_NAMESPACE_SCOPE_P (decl))
11080 if (CP_DECL_CONTEXT (decl) != global_namespace)
11082 error ("%qD may not be declared within a namespace", decl);
11085 else if (!TREE_PUBLIC (decl))
11087 error ("%qD may not be declared as static", decl);
11093 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11095 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11096 DECL_IS_OPERATOR_NEW (decl) = 1;
11098 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11099 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11102 /* An operator function must either be a non-static member function
11103 or have at least one parameter of a class, a reference to a class,
11104 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11105 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11107 if (operator_code == TYPE_EXPR
11108 || operator_code == CALL_EXPR
11109 || operator_code == COMPONENT_REF
11110 || operator_code == ARRAY_REF
11111 || operator_code == NOP_EXPR)
11113 error ("%qD must be a nonstatic member function", decl);
11120 if (DECL_STATIC_FUNCTION_P (decl))
11122 error ("%qD must be either a non-static member "
11123 "function or a non-member function", decl);
11127 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11129 tree arg = non_reference (TREE_VALUE (p));
11130 if (arg == error_mark_node)
11133 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11134 because these checks are performed even on
11135 template functions. */
11136 if (MAYBE_CLASS_TYPE_P (arg)
11137 || TREE_CODE (arg) == ENUMERAL_TYPE)
11141 if (!p || p == void_list_node)
11144 error ("%qD must have an argument of class or "
11145 "enumerated type", decl);
11151 /* There are no restrictions on the arguments to an overloaded
11153 if (operator_code == CALL_EXPR)
11156 /* Warn about conversion operators that will never be used. */
11157 if (IDENTIFIER_TYPENAME_P (name)
11158 && ! DECL_TEMPLATE_INFO (decl)
11160 /* Warn only declaring the function; there is no need to
11161 warn again about out-of-class definitions. */
11162 && class_type == current_class_type)
11164 tree t = TREE_TYPE (name);
11165 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11168 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11170 if (TREE_CODE (t) == VOID_TYPE)
11171 warning (OPT_Wconversion,
11173 ? G_("conversion to a reference to void "
11174 "will never use a type conversion operator")
11175 : G_("conversion to void "
11176 "will never use a type conversion operator"));
11177 else if (class_type)
11179 if (t == class_type)
11180 warning (OPT_Wconversion,
11182 ? G_("conversion to a reference to the same type "
11183 "will never use a type conversion operator")
11184 : G_("conversion to the same type "
11185 "will never use a type conversion operator"));
11186 /* Don't force t to be complete here. */
11187 else if (MAYBE_CLASS_TYPE_P (t)
11188 && COMPLETE_TYPE_P (t)
11189 && DERIVED_FROM_P (t, class_type))
11190 warning (OPT_Wconversion,
11192 ? G_("conversion to a reference to a base class "
11193 "will never use a type conversion operator")
11194 : G_("conversion to a base class "
11195 "will never use a type conversion operator"));
11200 if (operator_code == COND_EXPR)
11203 error ("ISO C++ prohibits overloading operator ?:");
11206 else if (ellipsis_p)
11208 error ("%qD must not have variable number of arguments", decl);
11211 else if (ambi_op_p (operator_code))
11214 /* We pick the one-argument operator codes by default, so
11215 we don't have to change anything. */
11217 else if (arity == 2)
11219 /* If we thought this was a unary operator, we now know
11220 it to be a binary operator. */
11221 switch (operator_code)
11224 operator_code = MULT_EXPR;
11228 operator_code = BIT_AND_EXPR;
11231 case UNARY_PLUS_EXPR:
11232 operator_code = PLUS_EXPR;
11236 operator_code = MINUS_EXPR;
11239 case PREINCREMENT_EXPR:
11240 operator_code = POSTINCREMENT_EXPR;
11243 case PREDECREMENT_EXPR:
11244 operator_code = POSTDECREMENT_EXPR;
11248 gcc_unreachable ();
11251 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11253 if ((operator_code == POSTINCREMENT_EXPR
11254 || operator_code == POSTDECREMENT_EXPR)
11255 && ! processing_template_decl
11256 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11259 error ("postfix %qD must take %<int%> as its argument",
11262 error ("postfix %qD must take %<int%> as its second "
11270 error ("%qD must take either zero or one argument", decl);
11272 error ("%qD must take either one or two arguments", decl);
11276 /* More Effective C++ rule 6. */
11278 && (operator_code == POSTINCREMENT_EXPR
11279 || operator_code == POSTDECREMENT_EXPR
11280 || operator_code == PREINCREMENT_EXPR
11281 || operator_code == PREDECREMENT_EXPR))
11283 tree arg = TREE_VALUE (argtypes);
11284 tree ret = TREE_TYPE (TREE_TYPE (decl));
11285 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11286 arg = TREE_TYPE (arg);
11287 arg = TYPE_MAIN_VARIANT (arg);
11288 if (operator_code == PREINCREMENT_EXPR
11289 || operator_code == PREDECREMENT_EXPR)
11291 if (TREE_CODE (ret) != REFERENCE_TYPE
11292 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11294 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11295 build_reference_type (arg));
11299 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11300 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11304 else if (unary_op_p (operator_code))
11309 error ("%qD must take %<void%>", decl);
11311 error ("%qD must take exactly one argument", decl);
11315 else /* if (binary_op_p (operator_code)) */
11320 error ("%qD must take exactly one argument", decl);
11322 error ("%qD must take exactly two arguments", decl);
11326 /* More Effective C++ rule 7. */
11328 && (operator_code == TRUTH_ANDIF_EXPR
11329 || operator_code == TRUTH_ORIF_EXPR
11330 || operator_code == COMPOUND_EXPR))
11331 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11335 /* Effective C++ rule 23. */
11338 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11339 && (operator_code == PLUS_EXPR
11340 || operator_code == MINUS_EXPR
11341 || operator_code == TRUNC_DIV_EXPR
11342 || operator_code == MULT_EXPR
11343 || operator_code == TRUNC_MOD_EXPR)
11344 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11345 warning (OPT_Weffc__, "%qD should return by value", decl);
11347 /* [over.oper]/8 */
11348 for (; argtypes && argtypes != void_list_node;
11349 argtypes = TREE_CHAIN (argtypes))
11350 if (TREE_PURPOSE (argtypes))
11352 TREE_PURPOSE (argtypes) = NULL_TREE;
11353 if (operator_code == POSTINCREMENT_EXPR
11354 || operator_code == POSTDECREMENT_EXPR)
11356 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11361 error ("%qD cannot have default arguments", decl);
11369 /* Return a string giving the keyword associate with CODE. */
11371 static const char *
11372 tag_name (enum tag_types code)
11384 case typename_type:
11387 gcc_unreachable ();
11391 /* Name lookup in an elaborated-type-specifier (after the keyword
11392 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11393 elaborated-type-specifier is invalid, issue a diagnostic and return
11394 error_mark_node; otherwise, return the *_TYPE to which it referred.
11395 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11398 check_elaborated_type_specifier (enum tag_types tag_code,
11400 bool allow_template_p)
11404 if (decl == error_mark_node)
11405 return error_mark_node;
11409 struct S { struct S *p; };
11411 name lookup will find the TYPE_DECL for the implicit "S::S"
11412 typedef. Adjust for that here. */
11413 if (DECL_SELF_REFERENCE_P (decl))
11414 decl = TYPE_NAME (TREE_TYPE (decl));
11416 type = TREE_TYPE (decl);
11418 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11419 is false for this case as well. */
11420 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11422 error ("using template type parameter %qT after %qs",
11423 type, tag_name (tag_code));
11424 return error_mark_node;
11426 /* Accept bound template template parameters. */
11427 else if (allow_template_p
11428 && TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
11432 If the identifier resolves to a typedef-name or the
11433 simple-template-id resolves to an alias template
11434 specialization, the elaborated-type-specifier is ill-formed.
11436 In other words, the only legitimate declaration to use in the
11437 elaborated type specifier is the implicit typedef created when
11438 the type is declared. */
11439 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11440 && !DECL_SELF_REFERENCE_P (decl)
11441 && tag_code != typename_type)
11443 if (alias_template_specialization_p (type))
11444 error ("using alias template specialization %qT after %qs",
11445 type, tag_name (tag_code));
11447 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11448 inform (DECL_SOURCE_LOCATION (decl),
11449 "%qD has a previous declaration here", decl);
11450 return error_mark_node;
11452 else if (TREE_CODE (type) != RECORD_TYPE
11453 && TREE_CODE (type) != UNION_TYPE
11454 && tag_code != enum_type
11455 && tag_code != typename_type)
11457 error ("%qT referred to as %qs", type, tag_name (tag_code));
11458 error ("%q+T has a previous declaration here", type);
11459 return error_mark_node;
11461 else if (TREE_CODE (type) != ENUMERAL_TYPE
11462 && tag_code == enum_type)
11464 error ("%qT referred to as enum", type);
11465 error ("%q+T has a previous declaration here", type);
11466 return error_mark_node;
11468 else if (!allow_template_p
11469 && TREE_CODE (type) == RECORD_TYPE
11470 && CLASSTYPE_IS_TEMPLATE (type))
11472 /* If a class template appears as elaborated type specifier
11473 without a template header such as:
11475 template <class T> class C {};
11476 void f(class C); // No template header here
11478 then the required template argument is missing. */
11479 error ("template argument required for %<%s %T%>",
11480 tag_name (tag_code),
11481 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11482 return error_mark_node;
11488 /* Lookup NAME in elaborate type specifier in scope according to
11489 SCOPE and issue diagnostics if necessary.
11490 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11491 found, and ERROR_MARK_NODE for type error. */
11494 lookup_and_check_tag (enum tag_types tag_code, tree name,
11495 tag_scope scope, bool template_header_p)
11499 if (scope == ts_global)
11501 /* First try ordinary name lookup, ignoring hidden class name
11502 injected via friend declaration. */
11503 decl = lookup_name_prefer_type (name, 2);
11504 /* If that fails, the name will be placed in the smallest
11505 non-class, non-function-prototype scope according to 3.3.1/5.
11506 We may already have a hidden name declared as friend in this
11507 scope. So lookup again but not ignoring hidden names.
11508 If we find one, that name will be made visible rather than
11509 creating a new tag. */
11511 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11514 decl = lookup_type_scope (name, scope);
11516 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11517 decl = DECL_TEMPLATE_RESULT (decl);
11519 if (decl && TREE_CODE (decl) == TYPE_DECL)
11521 /* Look for invalid nested type:
11525 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11527 error ("%qD has the same name as the class in which it is "
11530 return error_mark_node;
11533 /* Two cases we need to consider when deciding if a class
11534 template is allowed as an elaborated type specifier:
11535 1. It is a self reference to its own class.
11536 2. It comes with a template header.
11540 template <class T> class C {
11541 class C *c1; // DECL_SELF_REFERENCE_P is true
11544 template <class U> class C; // template_header_p is true
11545 template <class T> class C<T>::D {
11546 class C *c2; // DECL_SELF_REFERENCE_P is true
11549 t = check_elaborated_type_specifier (tag_code,
11552 | DECL_SELF_REFERENCE_P (decl));
11555 else if (decl && TREE_CODE (decl) == TREE_LIST)
11557 error ("reference to %qD is ambiguous", name);
11558 print_candidates (decl);
11559 return error_mark_node;
11565 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11566 Define the tag as a forward-reference if it is not defined.
11568 If a declaration is given, process it here, and report an error if
11569 multiple declarations are not identical.
11571 SCOPE is TS_CURRENT when this is also a definition. Only look in
11572 the current frame for the name (since C++ allows new names in any
11573 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11574 declaration. Only look beginning from the current scope outward up
11575 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11577 TEMPLATE_HEADER_P is true when this declaration is preceded by
11578 a set of template parameters. */
11581 xref_tag_1 (enum tag_types tag_code, tree name,
11582 tag_scope scope, bool template_header_p)
11584 enum tree_code code;
11586 tree context = NULL_TREE;
11588 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11594 code = RECORD_TYPE;
11600 code = ENUMERAL_TYPE;
11603 gcc_unreachable ();
11606 /* In case of anonymous name, xref_tag is only called to
11607 make type node and push name. Name lookup is not required. */
11608 if (ANON_AGGRNAME_P (name))
11611 t = lookup_and_check_tag (tag_code, name,
11612 scope, template_header_p);
11614 if (t == error_mark_node)
11615 return error_mark_node;
11617 if (scope != ts_current && t && current_class_type
11618 && template_class_depth (current_class_type)
11619 && template_header_p)
11621 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11622 definition of this tag. Since, in addition, we are currently
11623 processing a (member) template declaration of a template
11624 class, we must be very careful; consider:
11631 { template <class V>
11632 friend struct S1; };
11634 Here, the S2::S1 declaration should not be confused with the
11635 outer declaration. In particular, the inner version should
11636 have a template parameter of level 2, not level 1. This
11637 would be particularly important if the member declaration
11640 template <class V = U> friend struct S1;
11642 say, when we should tsubst into `U' when instantiating
11643 S2. On the other hand, when presented with:
11653 we must find the inner binding eventually. We
11654 accomplish this by making sure that the new type we
11655 create to represent this declaration has the right
11657 context = TYPE_CONTEXT (t);
11663 /* If no such tag is yet defined, create a forward-reference node
11664 and record it as the "definition".
11665 When a real declaration of this type is found,
11666 the forward-reference will be altered into a real type. */
11667 if (code == ENUMERAL_TYPE)
11669 error ("use of enum %q#D without previous declaration", name);
11670 return error_mark_node;
11674 t = make_class_type (code);
11675 TYPE_CONTEXT (t) = context;
11676 t = pushtag (name, t, scope);
11681 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11683 if (!redeclare_class_template (t, current_template_parms))
11684 return error_mark_node;
11686 else if (!processing_template_decl
11687 && CLASS_TYPE_P (t)
11688 && CLASSTYPE_IS_TEMPLATE (t))
11690 error ("redeclaration of %qT as a non-template", t);
11691 error ("previous declaration %q+D", t);
11692 return error_mark_node;
11695 /* Make injected friend class visible. */
11696 if (scope != ts_within_enclosing_non_class
11697 && hidden_name_p (TYPE_NAME (t)))
11699 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11700 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11702 if (TYPE_TEMPLATE_INFO (t))
11704 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11705 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11713 /* Wrapper for xref_tag_1. */
11716 xref_tag (enum tag_types tag_code, tree name,
11717 tag_scope scope, bool template_header_p)
11721 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11722 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11723 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11729 xref_tag_from_type (tree old, tree id, tag_scope scope)
11731 enum tag_types tag_kind;
11733 if (TREE_CODE (old) == RECORD_TYPE)
11734 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11736 tag_kind = union_type;
11738 if (id == NULL_TREE)
11739 id = TYPE_IDENTIFIER (old);
11741 return xref_tag (tag_kind, id, scope, false);
11744 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11745 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11746 access_* node, and the TREE_VALUE is the type of the base-class.
11747 Non-NULL TREE_TYPE indicates virtual inheritance.
11749 Returns true if the binfo hierarchy was successfully created,
11750 false if an error was detected. */
11753 xref_basetypes (tree ref, tree base_list)
11756 tree binfo, base_binfo;
11757 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11758 unsigned max_bases = 0; /* Maximum direct bases. */
11760 tree default_access;
11761 tree igo_prev; /* Track Inheritance Graph Order. */
11763 if (ref == error_mark_node)
11766 /* The base of a derived class is private by default, all others are
11768 default_access = (TREE_CODE (ref) == RECORD_TYPE
11769 && CLASSTYPE_DECLARED_CLASS (ref)
11770 ? access_private_node : access_public_node);
11772 /* First, make sure that any templates in base-classes are
11773 instantiated. This ensures that if we call ourselves recursively
11774 we do not get confused about which classes are marked and which
11776 basep = &base_list;
11779 tree basetype = TREE_VALUE (*basep);
11781 if (!(processing_template_decl && uses_template_parms (basetype))
11782 && !complete_type_or_else (basetype, NULL))
11783 /* An incomplete type. Remove it from the list. */
11784 *basep = TREE_CHAIN (*basep);
11788 if (TREE_TYPE (*basep))
11790 if (CLASS_TYPE_P (basetype))
11791 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11792 basep = &TREE_CHAIN (*basep);
11796 TYPE_MARKED_P (ref) = 1;
11798 /* The binfo slot should be empty, unless this is an (ill-formed)
11800 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11802 error ("redefinition of %q#T", ref);
11806 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11808 binfo = make_tree_binfo (max_bases);
11810 TYPE_BINFO (ref) = binfo;
11811 BINFO_OFFSET (binfo) = size_zero_node;
11812 BINFO_TYPE (binfo) = ref;
11814 /* Apply base-class info set up to the variants of this type. */
11815 fixup_type_variants (ref);
11819 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11820 /* An aggregate cannot have baseclasses. */
11821 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11823 if (TREE_CODE (ref) == UNION_TYPE)
11825 error ("derived union %qT invalid", ref);
11832 if (TYPE_FOR_JAVA (ref))
11834 error ("Java class %qT cannot have multiple bases", ref);
11841 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11843 if (TYPE_FOR_JAVA (ref))
11845 error ("Java class %qT cannot have virtual bases", ref);
11850 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11852 tree access = TREE_PURPOSE (base_list);
11853 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11854 tree basetype = TREE_VALUE (base_list);
11856 if (access == access_default_node)
11857 access = default_access;
11859 if (PACK_EXPANSION_P (basetype))
11860 basetype = PACK_EXPANSION_PATTERN (basetype);
11861 if (TREE_CODE (basetype) == TYPE_DECL)
11862 basetype = TREE_TYPE (basetype);
11863 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11865 error ("base type %qT fails to be a struct or class type",
11870 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11871 TYPE_FOR_JAVA (ref) = 1;
11873 base_binfo = NULL_TREE;
11874 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11876 base_binfo = TYPE_BINFO (basetype);
11877 /* The original basetype could have been a typedef'd type. */
11878 basetype = BINFO_TYPE (base_binfo);
11880 /* Inherit flags from the base. */
11881 TYPE_HAS_NEW_OPERATOR (ref)
11882 |= TYPE_HAS_NEW_OPERATOR (basetype);
11883 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11884 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11885 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11886 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11887 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11888 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11889 CLASSTYPE_REPEATED_BASE_P (ref)
11890 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11893 /* We must do this test after we've seen through a typedef
11895 if (TYPE_MARKED_P (basetype))
11897 if (basetype == ref)
11898 error ("recursive type %qT undefined", basetype);
11900 error ("duplicate base type %qT invalid", basetype);
11904 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11905 /* Regenerate the pack expansion for the bases. */
11906 basetype = make_pack_expansion (basetype);
11908 TYPE_MARKED_P (basetype) = 1;
11910 base_binfo = copy_binfo (base_binfo, basetype, ref,
11911 &igo_prev, via_virtual);
11912 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11913 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11915 BINFO_BASE_APPEND (binfo, base_binfo);
11916 BINFO_BASE_ACCESS_APPEND (binfo, access);
11919 if (VEC_length (tree, CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
11920 /* If we didn't get max_vbases vbases, we must have shared at
11921 least one of them, and are therefore diamond shaped. */
11922 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11924 /* Unmark all the types. */
11925 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11926 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11927 TYPE_MARKED_P (ref) = 0;
11929 /* Now see if we have a repeated base type. */
11930 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11932 for (base_binfo = binfo; base_binfo;
11933 base_binfo = TREE_CHAIN (base_binfo))
11935 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11937 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11940 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11942 for (base_binfo = binfo; base_binfo;
11943 base_binfo = TREE_CHAIN (base_binfo))
11944 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11945 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11954 /* Copies the enum-related properties from type SRC to type DST.
11955 Used with the underlying type of an enum and the enum itself. */
11957 copy_type_enum (tree dst, tree src)
11960 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
11962 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
11963 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
11964 TYPE_SIZE (t) = TYPE_SIZE (src);
11965 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
11966 SET_TYPE_MODE (dst, TYPE_MODE (src));
11967 TYPE_PRECISION (t) = TYPE_PRECISION (src);
11968 TYPE_ALIGN (t) = TYPE_ALIGN (src);
11969 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
11970 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
11974 /* Begin compiling the definition of an enumeration type.
11977 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11979 UNDERLYING_TYPE is the type that will be used as the storage for
11980 the enumeration type. This should be NULL_TREE if no storage type
11983 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11985 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11987 Returns the type object, as yet incomplete.
11988 Also records info about it so that build_enumerator
11989 may be used to declare the individual values as they are read. */
11992 start_enum (tree name, tree enumtype, tree underlying_type,
11993 bool scoped_enum_p, bool *is_new)
11995 tree prevtype = NULL_TREE;
11996 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
12000 /* [C++0x dcl.enum]p5:
12002 If not explicitly specified, the underlying type of a scoped
12003 enumeration type is int. */
12004 if (!underlying_type && scoped_enum_p)
12005 underlying_type = integer_type_node;
12007 if (underlying_type)
12008 underlying_type = cv_unqualified (underlying_type);
12010 /* If this is the real definition for a previous forward reference,
12011 fill in the contents in the same object that used to be the
12012 forward reference. */
12014 enumtype = lookup_and_check_tag (enum_type, name,
12015 /*tag_scope=*/ts_current,
12016 /*template_header_p=*/false);
12018 /* In case of a template_decl, the only check that should be deferred
12019 to instantiation time is the comparison of underlying types. */
12020 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12022 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12024 error_at (input_location, "scoped/unscoped mismatch "
12025 "in enum %q#T", enumtype);
12026 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12027 "previous definition here");
12028 enumtype = error_mark_node;
12030 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12032 error_at (input_location, "underlying type mismatch "
12033 "in enum %q#T", enumtype);
12034 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12035 "previous definition here");
12036 enumtype = error_mark_node;
12038 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12039 && !dependent_type_p (underlying_type)
12040 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12041 && !same_type_p (underlying_type,
12042 ENUM_UNDERLYING_TYPE (enumtype)))
12044 error_at (input_location, "different underlying type "
12045 "in enum %q#T", enumtype);
12046 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12047 "previous definition here");
12048 underlying_type = NULL_TREE;
12052 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12053 || processing_template_decl)
12055 /* In case of error, make a dummy enum to allow parsing to
12057 if (enumtype == error_mark_node)
12059 name = make_anon_name ();
12060 enumtype = NULL_TREE;
12063 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12064 of an opaque enum, or an opaque enum of an already defined
12065 enumeration (C++0x only).
12066 In any other case, it'll be NULL_TREE. */
12072 prevtype = enumtype;
12074 /* Do not push the decl more than once, unless we need to
12075 compare underlying types at instantiation time */
12077 || TREE_CODE (enumtype) != ENUMERAL_TYPE
12078 || (underlying_type
12079 && dependent_type_p (underlying_type))
12080 || (ENUM_UNDERLYING_TYPE (enumtype)
12081 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12083 enumtype = cxx_make_type (ENUMERAL_TYPE);
12084 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12087 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12090 if (enumtype == error_mark_node)
12091 return error_mark_node;
12093 /* The enum is considered opaque until the opening '{' of the
12094 enumerator list. */
12095 SET_OPAQUE_ENUM_P (enumtype, true);
12096 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12099 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12101 if (underlying_type)
12103 if (CP_INTEGRAL_TYPE_P (underlying_type))
12105 copy_type_enum (enumtype, underlying_type);
12106 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12108 else if (dependent_type_p (underlying_type))
12109 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12111 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12112 underlying_type, enumtype);
12115 /* If into a template class, the returned enum is always the first
12116 declaration (opaque or not) seen. This way all the references to
12117 this type will be to the same declaration. The following ones are used
12118 only to check for definition errors. */
12119 if (prevtype && processing_template_decl)
12125 /* After processing and defining all the values of an enumeration type,
12126 install their decls in the enumeration type.
12127 ENUMTYPE is the type object. */
12130 finish_enum_value_list (tree enumtype)
12133 tree underlying_type;
12136 tree minnode, maxnode;
12139 bool fixed_underlying_type_p
12140 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12142 /* We built up the VALUES in reverse order. */
12143 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12145 /* For an enum defined in a template, just set the type of the values;
12146 all further processing is postponed until the template is
12147 instantiated. We need to set the type so that tsubst of a CONST_DECL
12149 if (processing_template_decl)
12151 for (values = TYPE_VALUES (enumtype);
12153 values = TREE_CHAIN (values))
12154 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12158 /* Determine the minimum and maximum values of the enumerators. */
12159 if (TYPE_VALUES (enumtype))
12161 minnode = maxnode = NULL_TREE;
12163 for (values = TYPE_VALUES (enumtype);
12165 values = TREE_CHAIN (values))
12167 decl = TREE_VALUE (values);
12169 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12170 each enumerator has the type of its enumeration. Prior to the
12171 closing brace, the type of each enumerator is the type of its
12172 initializing value. */
12173 TREE_TYPE (decl) = enumtype;
12175 /* Update the minimum and maximum values, if appropriate. */
12176 value = DECL_INITIAL (decl);
12177 if (value == error_mark_node)
12178 value = integer_zero_node;
12179 /* Figure out what the minimum and maximum values of the
12180 enumerators are. */
12182 minnode = maxnode = value;
12183 else if (tree_int_cst_lt (maxnode, value))
12185 else if (tree_int_cst_lt (value, minnode))
12192 If the enumerator-list is empty, the underlying type is as if
12193 the enumeration had a single enumerator with value 0. */
12194 minnode = maxnode = integer_zero_node;
12196 if (!fixed_underlying_type_p)
12198 /* Compute the number of bits require to represent all values of the
12199 enumeration. We must do this before the type of MINNODE and
12200 MAXNODE are transformed, since tree_int_cst_min_precision relies
12201 on the TREE_TYPE of the value it is passed. */
12202 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12203 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12204 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12205 int precision = MAX (lowprec, highprec);
12207 bool use_short_enum;
12209 /* Determine the underlying type of the enumeration.
12213 The underlying type of an enumeration is an integral type that
12214 can represent all the enumerator values defined in the
12215 enumeration. It is implementation-defined which integral type is
12216 used as the underlying type for an enumeration except that the
12217 underlying type shall not be larger than int unless the value of
12218 an enumerator cannot fit in an int or unsigned int.
12220 We use "int" or an "unsigned int" as the underlying type, even if
12221 a smaller integral type would work, unless the user has
12222 explicitly requested that we use the smallest possible type. The
12223 user can request that for all enumerations with a command line
12224 flag, or for just one enumeration with an attribute. */
12226 use_short_enum = flag_short_enums
12227 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12229 for (itk = (use_short_enum ? itk_char : itk_int);
12233 underlying_type = integer_types[itk];
12234 if (underlying_type != NULL_TREE
12235 && TYPE_PRECISION (underlying_type) >= precision
12236 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12239 if (itk == itk_none)
12243 IF no integral type can represent all the enumerator values, the
12244 enumeration is ill-formed. */
12245 error ("no integral type can represent all of the enumerator values "
12246 "for %qT", enumtype);
12247 precision = TYPE_PRECISION (long_long_integer_type_node);
12248 underlying_type = integer_types[itk_unsigned_long_long];
12253 The value of sizeof() applied to an enumeration type, an object
12254 of an enumeration type, or an enumerator, is the value of sizeof()
12255 applied to the underlying type. */
12256 copy_type_enum (enumtype, underlying_type);
12258 /* Compute the minimum and maximum values for the type.
12262 For an enumeration where emin is the smallest enumerator and emax
12263 is the largest, the values of the enumeration are the values of the
12264 underlying type in the range bmin to bmax, where bmin and bmax are,
12265 respectively, the smallest and largest values of the smallest bit-
12266 field that can store emin and emax. */
12268 /* The middle-end currently assumes that types with TYPE_PRECISION
12269 narrower than their underlying type are suitably zero or sign
12270 extended to fill their mode. Similarly, it assumes that the front
12271 end assures that a value of a particular type must be within
12272 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12274 We used to set these fields based on bmin and bmax, but that led
12275 to invalid assumptions like optimizing away bounds checking. So
12276 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12277 TYPE_MAX_VALUE to the values for the mode above and only restrict
12278 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12279 ENUM_UNDERLYING_TYPE (enumtype)
12280 = build_distinct_type_copy (underlying_type);
12281 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12282 set_min_and_max_values_for_integral_type
12283 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12285 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12286 if (flag_strict_enums)
12287 set_min_and_max_values_for_integral_type (enumtype, precision,
12291 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12293 /* Convert each of the enumerators to the type of the underlying
12294 type of the enumeration. */
12295 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12297 location_t saved_location;
12299 decl = TREE_VALUE (values);
12300 saved_location = input_location;
12301 input_location = DECL_SOURCE_LOCATION (decl);
12302 if (fixed_underlying_type_p)
12303 /* If the enumeration type has a fixed underlying type, we
12304 already checked all of the enumerator values. */
12305 value = DECL_INITIAL (decl);
12307 value = perform_implicit_conversion (underlying_type,
12308 DECL_INITIAL (decl),
12309 tf_warning_or_error);
12310 input_location = saved_location;
12312 /* Do not clobber shared ints. */
12313 value = copy_node (value);
12315 TREE_TYPE (value) = enumtype;
12316 DECL_INITIAL (decl) = value;
12319 /* Fix up all variant types of this enum type. */
12320 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12321 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12323 /* Finish debugging output for this type. */
12324 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12327 /* Finishes the enum type. This is called only the first time an
12328 enumeration is seen, be it opaque or odinary.
12329 ENUMTYPE is the type object. */
12332 finish_enum (tree enumtype)
12334 if (processing_template_decl)
12336 if (at_function_scope_p ())
12337 add_stmt (build_min (TAG_DEFN, enumtype));
12341 /* If this is a forward declaration, there should not be any variants,
12342 though we can get a variant in the middle of an enum-specifier with
12343 wacky code like 'enum E { e = sizeof(const E*) };' */
12344 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12345 && (TYPE_VALUES (enumtype)
12346 || !TYPE_NEXT_VARIANT (enumtype)));
12349 /* Build and install a CONST_DECL for an enumeration constant of the
12350 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12351 LOC is the location of NAME.
12352 Assignment of sequential values by default is handled here. */
12355 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12361 /* If the VALUE was erroneous, pretend it wasn't there; that will
12362 result in the enum being assigned the next value in sequence. */
12363 if (value == error_mark_node)
12366 /* Remove no-op casts from the value. */
12368 STRIP_TYPE_NOPS (value);
12370 if (! processing_template_decl)
12372 /* Validate and default VALUE. */
12373 if (value != NULL_TREE)
12375 value = cxx_constant_value (value);
12377 if (TREE_CODE (value) != INTEGER_CST
12378 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12380 error ("enumerator value for %qD is not an integer constant",
12386 /* Default based on previous value. */
12387 if (value == NULL_TREE)
12389 if (TYPE_VALUES (enumtype))
12392 unsigned HOST_WIDE_INT lo;
12396 /* C++03 7.2/4: If no initializer is specified for the first
12397 enumerator, the type is an unspecified integral
12398 type. Otherwise the type is the same as the type of the
12399 initializing value of the preceding enumerator unless the
12400 incremented value is not representable in that type, in
12401 which case the type is an unspecified integral type
12402 sufficient to contain the incremented value. */
12403 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12404 if (error_operand_p (prev_value))
12405 value = error_mark_node;
12408 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12409 TREE_INT_CST_HIGH (prev_value),
12414 tree type = TREE_TYPE (prev_value);
12415 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12416 di.low = lo; di.high = hi;
12417 if (!double_int_fits_to_tree_p (type, di))
12420 for (itk = itk_int; itk != itk_none; itk++)
12422 type = integer_types[itk];
12423 if (type != NULL_TREE
12424 && (pos || !TYPE_UNSIGNED (type))
12425 && double_int_fits_to_tree_p (type, di))
12428 if (type && cxx_dialect < cxx0x
12429 && itk > itk_unsigned_long)
12430 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12431 incremented enumerator value is too large for %<unsigned long%>" : "\
12432 incremented enumerator value is too large for %<long%>");
12434 if (type == NULL_TREE)
12437 value = double_int_to_tree (type, di);
12442 error ("overflow in enumeration values at %qD", name);
12443 value = error_mark_node;
12448 value = integer_zero_node;
12451 /* Remove no-op casts from the value. */
12452 STRIP_TYPE_NOPS (value);
12454 /* If the underlying type of the enum is fixed, check whether
12455 the enumerator values fits in the underlying type. If it
12456 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12457 if (ENUM_UNDERLYING_TYPE (enumtype)
12459 && TREE_CODE (value) == INTEGER_CST
12460 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12462 error ("enumerator value %E is too large for underlying type %<%T%>",
12463 value, ENUM_UNDERLYING_TYPE (enumtype));
12465 /* Silently convert the value so that we can continue. */
12466 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12471 /* C++ associates enums with global, function, or class declarations. */
12472 context = current_scope ();
12474 /* Build the actual enumeration constant. Note that the enumeration
12475 constants have the underlying type of the enum (if it is fixed)
12476 or the type of their initializer (if the underlying type of the
12477 enum is not fixed):
12481 If the underlying type is fixed, the type of each enumerator
12482 prior to the closing brace is the underlying type; if the
12483 initializing value of an enumerator cannot be represented by
12484 the underlying type, the program is ill-formed. If the
12485 underlying type is not fixed, the type of each enumerator is
12486 the type of its initializing value.
12488 If the underlying type is not fixed, it will be computed by
12489 finish_enum and we will reset the type of this enumerator. Of
12490 course, if we're processing a template, there may be no value. */
12491 type = value ? TREE_TYPE (value) : NULL_TREE;
12493 if (context && context == current_class_type)
12494 /* This enum declaration is local to the class. We need the full
12495 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12496 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12498 /* It's a global enum, or it's local to a function. (Note local to
12499 a function could mean local to a class method. */
12500 decl = build_decl (loc, CONST_DECL, name, type);
12502 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12503 TREE_CONSTANT (decl) = 1;
12504 TREE_READONLY (decl) = 1;
12505 DECL_INITIAL (decl) = value;
12507 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12508 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12509 on the TYPE_FIELDS list for `S'. (That's so that you can say
12510 things like `S::i' later.) */
12511 finish_member_declaration (decl);
12515 /* Add this enumeration constant to the list for this type. */
12516 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12519 /* Look for an enumerator with the given NAME within the enumeration
12520 type ENUMTYPE. This routine is used primarily for qualified name
12521 lookup into an enumerator in C++0x, e.g.,
12523 enum class Color { Red, Green, Blue };
12525 Color color = Color::Red;
12527 Returns the value corresponding to the enumerator, or
12528 NULL_TREE if no such enumerator was found. */
12530 lookup_enumerator (tree enumtype, tree name)
12533 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12535 e = purpose_member (name, TYPE_VALUES (enumtype));
12536 return e? TREE_VALUE (e) : NULL_TREE;
12540 /* We're defining DECL. Make sure that its type is OK. */
12543 check_function_type (tree decl, tree current_function_parms)
12545 tree fntype = TREE_TYPE (decl);
12546 tree return_type = complete_type (TREE_TYPE (fntype));
12548 /* In a function definition, arg types must be complete. */
12549 require_complete_types_for_parms (current_function_parms);
12551 if (dependent_type_p (return_type))
12553 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12554 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12556 tree args = TYPE_ARG_TYPES (fntype);
12558 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12559 error ("return type %q#T is incomplete", return_type);
12561 error ("return type has Java class type %q#T", return_type);
12563 /* Make it return void instead. */
12564 if (TREE_CODE (fntype) == METHOD_TYPE)
12565 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12567 TREE_CHAIN (args));
12569 fntype = build_function_type (void_type_node, args);
12571 = build_exception_variant (fntype,
12572 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12573 fntype = (cp_build_type_attribute_variant
12574 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12575 TREE_TYPE (decl) = fntype;
12578 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12581 /* Create the FUNCTION_DECL for a function definition.
12582 DECLSPECS and DECLARATOR are the parts of the declaration;
12583 they describe the function's name and the type it returns,
12584 but twisted together in a fashion that parallels the syntax of C.
12586 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12587 DECLARATOR is really the DECL for the function we are about to
12588 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12589 indicating that the function is an inline defined in-class.
12591 This function creates a binding context for the function body
12592 as well as setting up the FUNCTION_DECL in current_function_decl.
12594 For C++, we must first check whether that datum makes any sense.
12595 For example, "class A local_a(1,2);" means that variable local_a
12596 is an aggregate of type A, which should have a constructor
12597 applied to it with the argument list [1, 2].
12599 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12600 or may be a BLOCK if the function has been defined previously
12601 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12602 error_mark_node if the function has never been defined, or
12603 a BLOCK if the function has been defined somewhere. */
12606 start_preparsed_function (tree decl1, tree attrs, int flags)
12608 tree ctype = NULL_TREE;
12611 int doing_friend = 0;
12612 cp_binding_level *bl;
12613 tree current_function_parms;
12614 struct c_fileinfo *finfo
12615 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12616 bool honor_interface;
12618 /* Sanity check. */
12619 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12620 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12622 fntype = TREE_TYPE (decl1);
12623 if (TREE_CODE (fntype) == METHOD_TYPE)
12624 ctype = TYPE_METHOD_BASETYPE (fntype);
12626 /* ISO C++ 11.4/5. A friend function defined in a class is in
12627 the (lexical) scope of the class in which it is defined. */
12628 if (!ctype && DECL_FRIEND_P (decl1))
12630 ctype = DECL_FRIEND_CONTEXT (decl1);
12632 /* CTYPE could be null here if we're dealing with a template;
12633 for example, `inline friend float foo()' inside a template
12634 will have no CTYPE set. */
12635 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12641 if (DECL_DECLARED_INLINE_P (decl1)
12642 && lookup_attribute ("noinline", attrs))
12643 warning (0, "inline function %q+D given attribute noinline", decl1);
12645 /* Handle gnu_inline attribute. */
12646 if (GNU_INLINE_P (decl1))
12648 DECL_EXTERNAL (decl1) = 1;
12649 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12650 DECL_INTERFACE_KNOWN (decl1) = 1;
12651 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12654 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12655 /* This is a constructor, we must ensure that any default args
12656 introduced by this definition are propagated to the clones
12657 now. The clones are used directly in overload resolution. */
12658 adjust_clone_args (decl1);
12660 /* Sometimes we don't notice that a function is a static member, and
12661 build a METHOD_TYPE for it. Fix that up now. */
12662 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12663 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12665 /* Set up current_class_type, and enter the scope of the class, if
12668 push_nested_class (ctype);
12669 else if (DECL_STATIC_FUNCTION_P (decl1))
12670 push_nested_class (DECL_CONTEXT (decl1));
12672 /* Now that we have entered the scope of the class, we must restore
12673 the bindings for any template parameters surrounding DECL1, if it
12674 is an inline member template. (Order is important; consider the
12675 case where a template parameter has the same name as a field of
12676 the class.) It is not until after this point that
12677 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12678 if (flags & SF_INCLASS_INLINE)
12679 maybe_begin_member_template_processing (decl1);
12681 /* Effective C++ rule 15. */
12683 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12684 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12685 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12687 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12688 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12689 if (!DECL_INITIAL (decl1))
12690 DECL_INITIAL (decl1) = error_mark_node;
12692 /* This function exists in static storage.
12693 (This does not mean `static' in the C sense!) */
12694 TREE_STATIC (decl1) = 1;
12696 /* We must call push_template_decl after current_class_type is set
12697 up. (If we are processing inline definitions after exiting a
12698 class scope, current_class_type will be NULL_TREE until set above
12699 by push_nested_class.) */
12700 if (processing_template_decl)
12702 /* FIXME: Handle error_mark_node more gracefully. */
12703 tree newdecl1 = push_template_decl (decl1);
12704 if (newdecl1 != error_mark_node)
12708 /* We are now in the scope of the function being defined. */
12709 current_function_decl = decl1;
12711 /* Save the parm names or decls from this function's declarator
12712 where store_parm_decls will find them. */
12713 current_function_parms = DECL_ARGUMENTS (decl1);
12715 /* Make sure the parameter and return types are reasonable. When
12716 you declare a function, these types can be incomplete, but they
12717 must be complete when you define the function. */
12718 check_function_type (decl1, current_function_parms);
12720 /* Build the return declaration for the function. */
12721 restype = TREE_TYPE (fntype);
12722 if (DECL_RESULT (decl1) == NULL_TREE)
12726 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12727 DECL_ARTIFICIAL (resdecl) = 1;
12728 DECL_IGNORED_P (resdecl) = 1;
12729 DECL_RESULT (decl1) = resdecl;
12731 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12734 /* Let the user know we're compiling this function. */
12735 announce_function (decl1);
12737 /* Record the decl so that the function name is defined.
12738 If we already have a decl for this name, and it is a FUNCTION_DECL,
12739 use the old decl. */
12740 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12742 /* A specialization is not used to guide overload resolution. */
12743 if (!DECL_FUNCTION_MEMBER_P (decl1)
12744 && !(DECL_USE_TEMPLATE (decl1) &&
12745 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12747 tree olddecl = pushdecl (decl1);
12749 if (olddecl == error_mark_node)
12750 /* If something went wrong when registering the declaration,
12751 use DECL1; we have to have a FUNCTION_DECL to use when
12752 parsing the body of the function. */
12756 /* Otherwise, OLDDECL is either a previous declaration
12757 of the same function or DECL1 itself. */
12759 if (warn_missing_declarations
12760 && olddecl == decl1
12761 && !DECL_MAIN_P (decl1)
12762 && TREE_PUBLIC (decl1)
12763 && !DECL_DECLARED_INLINE_P (decl1))
12767 /* Check whether DECL1 is in an anonymous
12769 for (context = DECL_CONTEXT (decl1);
12771 context = DECL_CONTEXT (context))
12773 if (TREE_CODE (context) == NAMESPACE_DECL
12774 && DECL_NAME (context) == NULL_TREE)
12778 if (context == NULL)
12779 warning (OPT_Wmissing_declarations,
12780 "no previous declaration for %q+D", decl1);
12788 /* We need to set the DECL_CONTEXT. */
12789 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12790 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12792 fntype = TREE_TYPE (decl1);
12794 /* If #pragma weak applies, mark the decl appropriately now.
12795 The pragma only applies to global functions. Because
12796 determining whether or not the #pragma applies involves
12797 computing the mangled name for the declaration, we cannot
12798 apply the pragma until after we have merged this declaration
12799 with any previous declarations; if the original declaration
12800 has a linkage specification, that specification applies to
12801 the definition as well, and may affect the mangled name. */
12802 if (DECL_FILE_SCOPE_P (decl1))
12803 maybe_apply_pragma_weak (decl1);
12806 /* Reset this in case the call to pushdecl changed it. */
12807 current_function_decl = decl1;
12809 gcc_assert (DECL_INITIAL (decl1));
12811 /* This function may already have been parsed, in which case just
12812 return; our caller will skip over the body without parsing. */
12813 if (DECL_INITIAL (decl1) != error_mark_node)
12816 /* Initialize RTL machinery. We cannot do this until
12817 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12818 even when processing a template; this is how we get
12819 CFUN set up, and our per-function variables initialized.
12820 FIXME factor out the non-RTL stuff. */
12821 bl = current_binding_level;
12822 allocate_struct_function (decl1, processing_template_decl);
12824 /* Initialize the language data structures. Whenever we start
12825 a new function, we destroy temporaries in the usual way. */
12826 cfun->language = ggc_alloc_cleared_language_function ();
12827 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12828 current_binding_level = bl;
12830 /* Start the statement-tree, start the tree now. */
12831 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12833 /* If we are (erroneously) defining a function that we have already
12834 defined before, wipe out what we knew before. */
12835 if (!DECL_PENDING_INLINE_P (decl1))
12836 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12838 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12840 /* We know that this was set up by `grokclassfn'. We do not
12841 wait until `store_parm_decls', since evil parse errors may
12842 never get us to that point. Here we keep the consistency
12843 between `current_class_type' and `current_class_ptr'. */
12844 tree t = DECL_ARGUMENTS (decl1);
12846 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12847 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12849 cp_function_chain->x_current_class_ref
12850 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12851 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12852 cp_function_chain->x_current_class_ptr = t;
12854 /* Constructors and destructors need to know whether they're "in
12855 charge" of initializing virtual base classes. */
12856 t = DECL_CHAIN (t);
12857 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12859 current_in_charge_parm = t;
12860 t = DECL_CHAIN (t);
12862 if (DECL_HAS_VTT_PARM_P (decl1))
12864 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12865 current_vtt_parm = t;
12869 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12870 /* Implicitly-defined methods (like the
12871 destructor for a class in which no destructor
12872 is explicitly declared) must not be defined
12873 until their definition is needed. So, we
12874 ignore interface specifications for
12875 compiler-generated functions. */
12876 && !DECL_ARTIFICIAL (decl1));
12878 if (processing_template_decl)
12879 /* Don't mess with interface flags. */;
12880 else if (DECL_INTERFACE_KNOWN (decl1))
12882 tree ctx = decl_function_context (decl1);
12884 if (DECL_NOT_REALLY_EXTERN (decl1))
12885 DECL_EXTERNAL (decl1) = 0;
12887 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12888 && TREE_PUBLIC (ctx))
12889 /* This is a function in a local class in an extern inline
12891 comdat_linkage (decl1);
12893 /* If this function belongs to an interface, it is public.
12894 If it belongs to someone else's interface, it is also external.
12895 This only affects inlines and template instantiations. */
12896 else if (!finfo->interface_unknown && honor_interface)
12898 if (DECL_DECLARED_INLINE_P (decl1)
12899 || DECL_TEMPLATE_INSTANTIATION (decl1))
12901 DECL_EXTERNAL (decl1)
12902 = (finfo->interface_only
12903 || (DECL_DECLARED_INLINE_P (decl1)
12904 && ! flag_implement_inlines
12905 && !DECL_VINDEX (decl1)));
12907 /* For WIN32 we also want to put these in linkonce sections. */
12908 maybe_make_one_only (decl1);
12911 DECL_EXTERNAL (decl1) = 0;
12912 DECL_INTERFACE_KNOWN (decl1) = 1;
12913 /* If this function is in an interface implemented in this file,
12914 make sure that the back end knows to emit this function
12916 if (!DECL_EXTERNAL (decl1))
12917 mark_needed (decl1);
12919 else if (finfo->interface_unknown && finfo->interface_only
12920 && honor_interface)
12922 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12923 interface, we will have both finfo->interface_unknown and
12924 finfo->interface_only set. In that case, we don't want to
12925 use the normal heuristics because someone will supply a
12926 #pragma implementation elsewhere, and deducing it here would
12927 produce a conflict. */
12928 comdat_linkage (decl1);
12929 DECL_EXTERNAL (decl1) = 0;
12930 DECL_INTERFACE_KNOWN (decl1) = 1;
12931 DECL_DEFER_OUTPUT (decl1) = 1;
12935 /* This is a definition, not a reference.
12936 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12937 if (!GNU_INLINE_P (decl1))
12938 DECL_EXTERNAL (decl1) = 0;
12940 if ((DECL_DECLARED_INLINE_P (decl1)
12941 || DECL_TEMPLATE_INSTANTIATION (decl1))
12942 && ! DECL_INTERFACE_KNOWN (decl1))
12943 DECL_DEFER_OUTPUT (decl1) = 1;
12945 DECL_INTERFACE_KNOWN (decl1) = 1;
12948 /* Determine the ELF visibility attribute for the function. We must not
12949 do this before calling "pushdecl", as we must allow "duplicate_decls"
12950 to merge any attributes appropriately. We also need to wait until
12952 if (!DECL_CLONED_FUNCTION_P (decl1))
12953 determine_visibility (decl1);
12955 begin_scope (sk_function_parms, decl1);
12959 if (DECL_DESTRUCTOR_P (decl1)
12960 || (DECL_CONSTRUCTOR_P (decl1)
12961 && targetm.cxx.cdtor_returns_this ()))
12963 cdtor_label = build_decl (input_location,
12964 LABEL_DECL, NULL_TREE, NULL_TREE);
12965 DECL_CONTEXT (cdtor_label) = current_function_decl;
12968 start_fname_decls ();
12970 store_parm_decls (current_function_parms);
12974 /* Like start_preparsed_function, except that instead of a
12975 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12977 Returns 1 on success. If the DECLARATOR is not suitable for a function
12978 (it defines a datum instead), we return 0, which tells
12979 yyparse to report a parse error. */
12982 start_function (cp_decl_specifier_seq *declspecs,
12983 const cp_declarator *declarator,
12988 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12989 if (decl1 == error_mark_node)
12991 /* If the declarator is not suitable for a function definition,
12992 cause a syntax error. */
12993 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12995 error ("invalid function declaration");
12999 if (DECL_MAIN_P (decl1))
13000 /* main must return int. grokfndecl should have corrected it
13001 (and issued a diagnostic) if the user got it wrong. */
13002 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
13003 integer_type_node));
13005 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13010 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13014 use_eh_spec_block (tree fn)
13016 return (flag_exceptions && flag_enforce_eh_specs
13017 && !processing_template_decl
13018 && !type_throw_all_p (TREE_TYPE (fn))
13019 /* We insert the EH_SPEC_BLOCK only in the original
13020 function; then, it is copied automatically to the
13022 && !DECL_CLONED_FUNCTION_P (fn)
13023 /* Implicitly-generated constructors and destructors have
13024 exception specifications. However, those specifications
13025 are the union of the possible exceptions specified by the
13026 constructors/destructors for bases and members, so no
13027 unallowed exception will ever reach this function. By
13028 not creating the EH_SPEC_BLOCK we save a little memory,
13029 and we avoid spurious warnings about unreachable
13031 && !DECL_DEFAULTED_FN (fn));
13034 /* Store the parameter declarations into the current function declaration.
13035 This is called after parsing the parameter declarations, before
13036 digesting the body of the function.
13038 Also install to binding contour return value identifier, if any. */
13041 store_parm_decls (tree current_function_parms)
13043 tree fndecl = current_function_decl;
13046 /* This is a chain of any other decls that came in among the parm
13047 declarations. If a parm is declared with enum {foo, bar} x;
13048 then CONST_DECLs for foo and bar are put here. */
13049 tree nonparms = NULL_TREE;
13051 if (current_function_parms)
13053 /* This case is when the function was defined with an ANSI prototype.
13054 The parms already have decls, so we need not do anything here
13055 except record them as in effect
13056 and complain if any redundant old-style parm decls were written. */
13058 tree specparms = current_function_parms;
13061 /* Must clear this because it might contain TYPE_DECLs declared
13063 current_binding_level->names = NULL;
13065 /* If we're doing semantic analysis, then we'll call pushdecl
13066 for each of these. We must do them in reverse order so that
13067 they end in the correct forward order. */
13068 specparms = nreverse (specparms);
13070 for (parm = specparms; parm; parm = next)
13072 next = DECL_CHAIN (parm);
13073 if (TREE_CODE (parm) == PARM_DECL)
13075 if (DECL_NAME (parm) == NULL_TREE
13076 || TREE_CODE (parm) != VOID_TYPE)
13079 error ("parameter %qD declared void", parm);
13083 /* If we find an enum constant or a type tag,
13084 put it aside for the moment. */
13085 TREE_CHAIN (parm) = NULL_TREE;
13086 nonparms = chainon (nonparms, parm);
13090 /* Get the decls in their original chain order and record in the
13091 function. This is all and only the PARM_DECLs that were
13092 pushed into scope by the loop above. */
13093 DECL_ARGUMENTS (fndecl) = getdecls ();
13096 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13098 /* Now store the final chain of decls for the arguments
13099 as the decl-chain of the current lexical scope.
13100 Put the enumerators in as well, at the front so that
13101 DECL_ARGUMENTS is not modified. */
13102 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13104 if (use_eh_spec_block (current_function_decl))
13105 current_eh_spec_block = begin_eh_spec_block ();
13109 /* We have finished doing semantic analysis on DECL, but have not yet
13110 generated RTL for its body. Save away our current state, so that
13111 when we want to generate RTL later we know what to do. */
13114 save_function_data (tree decl)
13116 struct language_function *f;
13118 /* Save the language-specific per-function data so that we can
13119 get it back when we really expand this function. */
13120 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13123 f = ggc_alloc_language_function ();
13124 memcpy (f, cp_function_chain, sizeof (struct language_function));
13125 DECL_SAVED_FUNCTION_DATA (decl) = f;
13127 /* Clear out the bits we don't need. */
13128 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13129 f->bindings = NULL;
13130 f->x_local_names = NULL;
13131 f->base.local_typedefs = NULL;
13135 /* Set the return value of the constructor (if present). */
13138 finish_constructor_body (void)
13143 if (targetm.cxx.cdtor_returns_this ()
13144 && (! TYPE_FOR_JAVA (current_class_type)))
13146 /* Any return from a constructor will end up here. */
13147 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13149 val = DECL_ARGUMENTS (current_function_decl);
13150 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13151 DECL_RESULT (current_function_decl), val);
13152 /* Return the address of the object. */
13153 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13154 add_stmt (exprstmt);
13158 /* Do all the processing for the beginning of a destructor; set up the
13159 vtable pointers and cleanups for bases and members. */
13162 begin_destructor_body (void)
13164 tree compound_stmt;
13166 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13167 issued an error message. We still want to try to process the
13168 body of the function, but initialize_vtbl_ptrs will crash if
13169 TYPE_BINFO is NULL. */
13170 if (COMPLETE_TYPE_P (current_class_type))
13172 compound_stmt = begin_compound_stmt (0);
13173 /* Make all virtual function table pointers in non-virtual base
13174 classes point to CURRENT_CLASS_TYPE's virtual function
13176 initialize_vtbl_ptrs (current_class_ptr);
13177 finish_compound_stmt (compound_stmt);
13179 /* And insert cleanups for our bases and members so that they
13180 will be properly destroyed if we throw. */
13181 push_base_cleanups ();
13185 /* At the end of every destructor we generate code to delete the object if
13186 necessary. Do that now. */
13189 finish_destructor_body (void)
13193 /* Any return from a destructor will end up here; that way all base
13194 and member cleanups will be run when the function returns. */
13195 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13197 /* In a virtual destructor, we must call delete. */
13198 if (DECL_VIRTUAL_P (current_function_decl))
13201 tree virtual_size = cxx_sizeof (current_class_type);
13205 At the point of definition of a virtual destructor (including
13206 an implicit definition), non-placement operator delete shall
13207 be looked up in the scope of the destructor's class and if
13208 found shall be accessible and unambiguous. */
13209 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13211 /*global_p=*/false,
13212 /*placement=*/NULL_TREE,
13213 /*alloc_fn=*/NULL_TREE);
13215 if_stmt = begin_if_stmt ();
13216 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13217 current_in_charge_parm,
13220 finish_expr_stmt (exprstmt);
13221 finish_then_clause (if_stmt);
13222 finish_if_stmt (if_stmt);
13225 if (targetm.cxx.cdtor_returns_this ())
13229 val = DECL_ARGUMENTS (current_function_decl);
13230 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13231 DECL_RESULT (current_function_decl), val);
13232 /* Return the address of the object. */
13233 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13234 add_stmt (exprstmt);
13238 /* Do the necessary processing for the beginning of a function body, which
13239 in this case includes member-initializers, but not the catch clauses of
13240 a function-try-block. Currently, this means opening a binding level
13241 for the member-initializers (in a ctor), member cleanups (in a dtor),
13242 and capture proxies (in a lambda operator()). */
13245 begin_function_body (void)
13249 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13252 if (processing_template_decl)
13253 /* Do nothing now. */;
13255 /* Always keep the BLOCK node associated with the outermost pair of
13256 curly braces of a function. These are needed for correct
13257 operation of dwarfout.c. */
13258 keep_next_level (true);
13260 stmt = begin_compound_stmt (BCS_FN_BODY);
13262 if (processing_template_decl)
13263 /* Do nothing now. */;
13264 else if (DECL_DESTRUCTOR_P (current_function_decl))
13265 begin_destructor_body ();
13270 /* Do the processing for the end of a function body. Currently, this means
13271 closing out the cleanups for fully-constructed bases and members, and in
13272 the case of the destructor, deleting the object if desired. Again, this
13273 is only meaningful for [cd]tors, since they are the only functions where
13274 there is a significant distinction between the main body and any
13275 function catch clauses. Handling, say, main() return semantics here
13276 would be wrong, as flowing off the end of a function catch clause for
13277 main() would also need to return 0. */
13280 finish_function_body (tree compstmt)
13282 if (compstmt == NULL_TREE)
13285 /* Close the block. */
13286 finish_compound_stmt (compstmt);
13288 if (processing_template_decl)
13289 /* Do nothing now. */;
13290 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13291 finish_constructor_body ();
13292 else if (DECL_DESTRUCTOR_P (current_function_decl))
13293 finish_destructor_body ();
13296 /* Given a function, returns the BLOCK corresponding to the outermost level
13297 of curly braces, skipping the artificial block created for constructor
13301 outer_curly_brace_block (tree fndecl)
13303 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13304 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13305 /* Skip the artificial function body block. */
13306 block = BLOCK_SUBBLOCKS (block);
13310 /* If FNDECL is a class's key method, add the class to the list of
13311 keyed classes that should be emitted. */
13314 record_key_method_defined (tree fndecl)
13316 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13317 && DECL_VIRTUAL_P (fndecl)
13318 && !processing_template_decl)
13320 tree fnclass = DECL_CONTEXT (fndecl);
13321 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13322 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13326 /* Subroutine of finish_function.
13327 Save the body of constexpr functions for possible
13328 future compile time evaluation. */
13331 maybe_save_function_definition (tree fun)
13333 if (!processing_template_decl
13334 && DECL_DECLARED_CONSTEXPR_P (fun)
13335 && !DECL_CLONED_FUNCTION_P (fun))
13336 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13339 /* Finish up a function declaration and compile that function
13340 all the way to assembler language output. The free the storage
13341 for the function definition.
13343 FLAGS is a bitwise or of the following values:
13345 We just finished processing the body of an in-class inline
13346 function definition. (This processing will have taken place
13347 after the class definition is complete.) */
13350 finish_function (int flags)
13352 tree fndecl = current_function_decl;
13353 tree fntype, ctype = NULL_TREE;
13354 int inclass_inline = (flags & 2) != 0;
13356 /* When we get some parse errors, we can end up without a
13357 current_function_decl, so cope. */
13358 if (fndecl == NULL_TREE)
13359 return error_mark_node;
13361 if (c_dialect_objc ())
13362 objc_finish_function ();
13364 gcc_assert (!defer_mark_used_calls);
13365 defer_mark_used_calls = true;
13367 record_key_method_defined (fndecl);
13369 fntype = TREE_TYPE (fndecl);
13371 /* TREE_READONLY (fndecl) = 1;
13372 This caused &foo to be of type ptr-to-const-function
13373 which then got a warning when stored in a ptr-to-function variable. */
13375 gcc_assert (building_stmt_list_p ());
13376 /* The current function is being defined, so its DECL_INITIAL should
13377 be set, and unless there's a multiple definition, it should be
13378 error_mark_node. */
13379 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13381 /* For a cloned function, we've already got all the code we need;
13382 there's no need to add any extra bits. */
13383 if (!DECL_CLONED_FUNCTION_P (fndecl))
13385 if (DECL_MAIN_P (current_function_decl))
13387 /* Make it so that `main' always returns 0 by default (or
13390 finish_return_stmt (integer_one_node);
13392 finish_return_stmt (integer_zero_node);
13396 if (use_eh_spec_block (current_function_decl))
13397 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13398 (TREE_TYPE (current_function_decl)),
13399 current_eh_spec_block);
13402 /* If we're saving up tree structure, tie off the function now. */
13403 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13405 finish_fname_decls ();
13407 /* If this function can't throw any exceptions, remember that. */
13408 if (!processing_template_decl
13409 && !cp_function_chain->can_throw
13410 && !flag_non_call_exceptions
13411 && !decl_replaceable_p (fndecl))
13412 TREE_NOTHROW (fndecl) = 1;
13414 /* This must come after expand_function_end because cleanups might
13415 have declarations (from inline functions) that need to go into
13416 this function's blocks. */
13418 /* If the current binding level isn't the outermost binding level
13419 for this function, either there is a bug, or we have experienced
13420 syntax errors and the statement tree is malformed. */
13421 if (current_binding_level->kind != sk_function_parms)
13423 /* Make sure we have already experienced errors. */
13424 gcc_assert (errorcount);
13426 /* Throw away the broken statement tree and extra binding
13428 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13430 while (current_binding_level->kind != sk_function_parms)
13432 if (current_binding_level->kind == sk_class)
13433 pop_nested_class ();
13435 poplevel (0, 0, 0);
13438 poplevel (1, 0, 1);
13440 /* Statements should always be full-expressions at the outermost set
13441 of curly braces for a function. */
13442 gcc_assert (stmts_are_full_exprs_p ());
13444 /* Save constexpr function body before it gets munged by
13445 the NRV transformation. */
13446 maybe_save_function_definition (fndecl);
13448 /* Set up the named return value optimization, if we can. Candidate
13449 variables are selected in check_return_expr. */
13450 if (current_function_return_value)
13452 tree r = current_function_return_value;
13455 if (r != error_mark_node
13456 /* This is only worth doing for fns that return in memory--and
13457 simpler, since we don't have to worry about promoted modes. */
13458 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13459 /* Only allow this for variables declared in the outer scope of
13460 the function so we know that their lifetime always ends with a
13461 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13462 we were to do this optimization in tree-ssa. */
13463 && (outer = outer_curly_brace_block (fndecl))
13464 && chain_member (r, BLOCK_VARS (outer)))
13465 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13467 current_function_return_value = NULL_TREE;
13470 /* Remember that we were in class scope. */
13471 if (current_class_name)
13472 ctype = current_class_type;
13474 /* Must mark the RESULT_DECL as being in this function. */
13475 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13477 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13478 to the FUNCTION_DECL node itself. */
13479 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13481 /* Save away current state, if appropriate. */
13482 if (!processing_template_decl)
13483 save_function_data (fndecl);
13485 /* Complain if there's just no return statement. */
13486 if (warn_return_type
13487 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13488 && !dependent_type_p (TREE_TYPE (fntype))
13489 && !current_function_returns_value && !current_function_returns_null
13490 /* Don't complain if we abort or throw. */
13491 && !current_function_returns_abnormally
13492 /* Don't complain if we are declared noreturn. */
13493 && !TREE_THIS_VOLATILE (fndecl)
13494 && !DECL_NAME (DECL_RESULT (fndecl))
13495 && !TREE_NO_WARNING (fndecl)
13496 /* Structor return values (if any) are set by the compiler. */
13497 && !DECL_CONSTRUCTOR_P (fndecl)
13498 && !DECL_DESTRUCTOR_P (fndecl))
13500 warning (OPT_Wreturn_type,
13501 "no return statement in function returning non-void");
13502 TREE_NO_WARNING (fndecl) = 1;
13505 /* Store the end of the function, so that we get good line number
13506 info for the epilogue. */
13507 cfun->function_end_locus = input_location;
13509 /* Complain about parameters that are only set, but never otherwise used. */
13510 if (warn_unused_but_set_parameter
13511 && !processing_template_decl
13512 && errorcount == unused_but_set_errorcount
13513 && !DECL_CLONED_FUNCTION_P (fndecl))
13517 for (decl = DECL_ARGUMENTS (fndecl);
13519 decl = DECL_CHAIN (decl))
13520 if (TREE_USED (decl)
13521 && TREE_CODE (decl) == PARM_DECL
13522 && !DECL_READ_P (decl)
13523 && DECL_NAME (decl)
13524 && !DECL_ARTIFICIAL (decl)
13525 && !TREE_NO_WARNING (decl)
13526 && !DECL_IN_SYSTEM_HEADER (decl)
13527 && TREE_TYPE (decl) != error_mark_node
13528 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13529 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13530 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13531 warning (OPT_Wunused_but_set_parameter,
13532 "parameter %q+D set but not used", decl);
13533 unused_but_set_errorcount = errorcount;
13536 /* Complain about locally defined typedefs that are not used in this
13538 maybe_warn_unused_local_typedefs ();
13540 /* Genericize before inlining. */
13541 if (!processing_template_decl)
13543 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13544 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13545 cp_genericize (fndecl);
13546 /* Clear out the bits we don't need. */
13547 f->x_current_class_ptr = NULL;
13548 f->x_current_class_ref = NULL;
13549 f->x_eh_spec_block = NULL;
13550 f->x_in_charge_parm = NULL;
13551 f->x_vtt_parm = NULL;
13552 f->x_return_value = NULL;
13553 f->bindings = NULL;
13554 f->extern_decl_map = NULL;
13556 /* Clear out the bits we don't need. */
13557 local_names = NULL;
13559 /* We're leaving the context of this function, so zap cfun. It's still in
13560 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13562 current_function_decl = NULL;
13564 /* If this is an in-class inline definition, we may have to pop the
13565 bindings for the template parameters that we added in
13566 maybe_begin_member_template_processing when start_function was
13568 if (inclass_inline)
13569 maybe_end_member_template_processing ();
13571 /* Leave the scope of the class. */
13573 pop_nested_class ();
13578 current_function_decl = NULL_TREE;
13580 defer_mark_used_calls = false;
13581 if (deferred_mark_used_calls)
13586 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13588 VEC_free (tree, gc, deferred_mark_used_calls);
13594 /* Create the FUNCTION_DECL for a function definition.
13595 DECLSPECS and DECLARATOR are the parts of the declaration;
13596 they describe the return type and the name of the function,
13597 but twisted together in a fashion that parallels the syntax of C.
13599 This function creates a binding context for the function body
13600 as well as setting up the FUNCTION_DECL in current_function_decl.
13602 Returns a FUNCTION_DECL on success.
13604 If the DECLARATOR is not suitable for a function (it defines a datum
13605 instead), we return 0, which tells yyparse to report a parse error.
13607 May return void_type_node indicating that this method is actually
13608 a friend. See grokfield for more details.
13610 Came here with a `.pushlevel' .
13612 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13613 CHANGES TO CODE IN `grokfield'. */
13616 grokmethod (cp_decl_specifier_seq *declspecs,
13617 const cp_declarator *declarator, tree attrlist)
13619 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13622 if (fndecl == error_mark_node)
13623 return error_mark_node;
13625 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13627 error ("invalid member function declaration");
13628 return error_mark_node;
13632 cplus_decl_attributes (&fndecl, attrlist, 0);
13634 /* Pass friends other than inline friend functions back. */
13635 if (fndecl == void_type_node)
13638 if (DECL_IN_AGGR_P (fndecl))
13640 if (DECL_CLASS_SCOPE_P (fndecl))
13641 error ("%qD is already defined in class %qT", fndecl,
13642 DECL_CONTEXT (fndecl));
13643 return error_mark_node;
13646 check_template_shadow (fndecl);
13648 DECL_DECLARED_INLINE_P (fndecl) = 1;
13649 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13651 /* We process method specializations in finish_struct_1. */
13652 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13654 fndecl = push_template_decl (fndecl);
13655 if (fndecl == error_mark_node)
13659 if (! DECL_FRIEND_P (fndecl))
13661 if (DECL_CHAIN (fndecl))
13663 fndecl = copy_node (fndecl);
13664 TREE_CHAIN (fndecl) = NULL_TREE;
13668 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13670 DECL_IN_AGGR_P (fndecl) = 1;
13675 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13676 we can lay it out later, when and if its type becomes complete. */
13679 maybe_register_incomplete_var (tree var)
13681 gcc_assert (TREE_CODE (var) == VAR_DECL);
13683 /* Keep track of variables with incomplete types. */
13684 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13685 && DECL_EXTERNAL (var))
13687 tree inner_type = TREE_TYPE (var);
13689 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13690 inner_type = TREE_TYPE (inner_type);
13691 inner_type = TYPE_MAIN_VARIANT (inner_type);
13693 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13694 /* RTTI TD entries are created while defining the type_info. */
13695 || (TYPE_LANG_SPECIFIC (inner_type)
13696 && TYPE_BEING_DEFINED (inner_type)))
13699 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13701 iv->incomplete_type = inner_type;
13706 /* Called when a class type (given by TYPE) is defined. If there are
13707 any existing VAR_DECLs whose type has been completed by this
13708 declaration, update them now. */
13711 complete_vars (tree type)
13714 incomplete_var *iv;
13716 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13718 if (same_type_p (type, iv->incomplete_type))
13720 tree var = iv->decl;
13721 tree type = TREE_TYPE (var);
13722 /* Complete the type of the variable. The VAR_DECL itself
13723 will be laid out in expand_expr. */
13724 complete_type (type);
13725 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13726 /* Remove this entry from the list. */
13727 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13733 /* Check for pending declarations which may have abstract type. */
13734 complete_type_check_abstract (type);
13737 /* If DECL is of a type which needs a cleanup, build and return an
13738 expression to perform that cleanup here. Return NULL_TREE if no
13739 cleanup need be done. */
13742 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13748 /* Assume no cleanup is required. */
13749 cleanup = NULL_TREE;
13751 if (error_operand_p (decl))
13754 /* Handle "__attribute__((cleanup))". We run the cleanup function
13755 before the destructor since the destructor is what actually
13756 terminates the lifetime of the object. */
13757 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13764 /* Get the name specified by the user for the cleanup function. */
13765 id = TREE_VALUE (TREE_VALUE (attr));
13766 /* Look up the name to find the cleanup function to call. It is
13767 important to use lookup_name here because that is what is
13768 used in c-common.c:handle_cleanup_attribute when performing
13769 initial checks on the attribute. Note that those checks
13770 include ensuring that the function found is not an overloaded
13771 function, or an object with an overloaded call operator,
13772 etc.; we can rely on the fact that the function found is an
13773 ordinary FUNCTION_DECL. */
13774 fn = lookup_name (id);
13775 arg = build_address (decl);
13777 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13778 if (cleanup == error_mark_node)
13779 return error_mark_node;
13781 /* Handle ordinary C++ destructors. */
13782 type = TREE_TYPE (decl);
13783 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13785 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13786 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13787 && CLASSTYPE_VBASECLASSES (type));
13791 if (TREE_CODE (type) == ARRAY_TYPE)
13794 addr = build_address (decl);
13796 /* Optimize for space over speed here. */
13797 if (!has_vbases || flag_expensive_optimizations)
13798 flags |= LOOKUP_NONVIRTUAL;
13800 call = build_delete (TREE_TYPE (addr), addr,
13801 sfk_complete_destructor, flags, 0, complain);
13802 if (call == error_mark_node)
13803 cleanup = error_mark_node;
13805 cleanup = cp_build_compound_expr (cleanup, call, complain);
13810 /* build_delete sets the location of the destructor call to the
13811 current location, even though the destructor is going to be
13812 called later, at the end of the current scope. This can lead to
13813 a "jumpy" behaviour for users of debuggers when they step around
13814 the end of the block. So let's unset the location of the
13815 destructor call instead. */
13816 if (cleanup != NULL && EXPR_P (cleanup))
13817 SET_EXPR_LOCATION (cleanup, UNKNOWN_LOCATION);
13822 /* When a stmt has been parsed, this function is called. */
13829 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13830 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13831 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13834 static_fn_type (tree memfntype)
13839 if (TYPE_PTRMEMFUNC_P (memfntype))
13840 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13841 if (POINTER_TYPE_P (memfntype)
13842 || TREE_CODE (memfntype) == FUNCTION_DECL)
13843 memfntype = TREE_TYPE (memfntype);
13844 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13846 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13847 args = TYPE_ARG_TYPES (memfntype);
13848 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13849 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13850 fntype = (cp_build_type_attribute_variant
13851 (fntype, TYPE_ATTRIBUTES (memfntype)));
13852 fntype = (build_exception_variant
13853 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13857 /* DECL was originally constructed as a non-static member function,
13858 but turned out to be static. Update it accordingly. */
13861 revert_static_member_fn (tree decl)
13863 tree stype = static_fn_type (decl);
13864 cp_cv_quals quals = type_memfn_quals (stype);
13866 if (quals != TYPE_UNQUALIFIED)
13867 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13869 TREE_TYPE (decl) = stype;
13871 if (DECL_ARGUMENTS (decl))
13872 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13873 DECL_STATIC_FUNCTION_P (decl) = 1;
13876 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13877 one of the language-independent trees. */
13879 enum cp_tree_node_structure_enum
13880 cp_tree_node_structure (union lang_tree_node * t)
13882 switch (TREE_CODE (&t->generic))
13884 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13885 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13886 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13887 case OVERLOAD: return TS_CP_OVERLOAD;
13888 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13889 case PTRMEM_CST: return TS_CP_PTRMEM;
13890 case BASELINK: return TS_CP_BASELINK;
13891 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13892 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13893 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13894 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13895 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13896 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13897 default: return TS_CP_GENERIC;
13901 /* Build the void_list_node (void_type_node having been created). */
13903 build_void_list_node (void)
13905 tree t = build_tree_list (NULL_TREE, void_type_node);
13910 cp_missing_noreturn_ok_p (tree decl)
13912 /* A missing noreturn is ok for the `main' function. */
13913 return DECL_MAIN_P (decl);
13916 /* Return the COMDAT group into which DECL should be placed. */
13919 cxx_comdat_group (tree decl)
13923 /* Virtual tables, construction virtual tables, and virtual table
13924 tables all go in a single COMDAT group, named after the primary
13926 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13927 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13928 /* For all other DECLs, the COMDAT group is the mangled name of the
13929 declaration itself. */
13932 while (DECL_THUNK_P (decl))
13934 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13935 into the same section as the target function. In that case
13936 we must return target's name. */
13937 tree target = THUNK_TARGET (decl);
13938 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13939 && DECL_SECTION_NAME (target) != NULL
13940 && DECL_ONE_ONLY (target))
13945 name = DECL_ASSEMBLER_NAME (decl);
13951 #include "gt-cp-decl.h"