1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, tree *, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, tree *);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (DECL_P (olddecl)
1207 && TREE_CODE (newdecl) == FUNCTION_DECL
1208 && TREE_CODE (olddecl) == FUNCTION_DECL
1209 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1211 if (DECL_DECLARED_INLINE_P (newdecl)
1212 && DECL_UNINLINABLE (newdecl)
1213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1214 /* Already warned elsewhere. */;
1215 else if (DECL_DECLARED_INLINE_P (olddecl)
1216 && DECL_UNINLINABLE (olddecl)
1217 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 /* Already warned. */;
1219 else if (DECL_DECLARED_INLINE_P (newdecl)
1220 && DECL_UNINLINABLE (olddecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1225 warning (OPT_Wattributes, "previous declaration of %q+D "
1226 "with attribute noinline", olddecl);
1228 else if (DECL_DECLARED_INLINE_P (olddecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1232 warning (OPT_Wattributes, "function %q+D redeclared with "
1233 "attribute noinline", newdecl);
1234 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1239 /* Check for redeclaration and other discrepancies. */
1240 if (TREE_CODE (olddecl) == FUNCTION_DECL
1241 && DECL_ARTIFICIAL (olddecl))
1243 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1244 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1246 /* Avoid warnings redeclaring built-ins which have not been
1247 explicitly declared. */
1248 if (DECL_ANTICIPATED (olddecl))
1251 /* If you declare a built-in or predefined function name as static,
1252 the old definition is overridden, but optionally warn this was a
1253 bad choice of name. */
1254 if (! TREE_PUBLIC (newdecl))
1256 warning (OPT_Wshadow,
1257 DECL_BUILT_IN (olddecl)
1258 ? G_("shadowing built-in function %q#D")
1259 : G_("shadowing library function %q#D"), olddecl);
1260 /* Discard the old built-in function. */
1263 /* If the built-in is not ansi, then programs can override
1264 it even globally without an error. */
1265 else if (! DECL_BUILT_IN (olddecl))
1266 warning (0, "library function %q#D redeclared as non-function %q#D",
1270 error ("declaration of %q#D", newdecl);
1271 error ("conflicts with built-in declaration %q#D",
1276 else if (!types_match)
1278 /* Avoid warnings redeclaring built-ins which have not been
1279 explicitly declared. */
1280 if (DECL_ANTICIPATED (olddecl))
1282 /* Deal with fileptr_type_node. FILE type is not known
1283 at the time we create the builtins. */
1286 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1287 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1289 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1292 else if (TREE_VALUE (t2) == fileptr_type_node)
1294 tree t = TREE_VALUE (t1);
1296 if (TREE_CODE (t) == POINTER_TYPE
1297 && TYPE_NAME (TREE_TYPE (t))
1298 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1299 == get_identifier ("FILE")
1300 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1302 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1305 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1306 types_match = decls_match (newdecl, olddecl);
1308 return duplicate_decls (newdecl, olddecl,
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1313 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1316 else if ((DECL_EXTERN_C_P (newdecl)
1317 && DECL_EXTERN_C_P (olddecl))
1318 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1321 /* A near match; override the builtin. */
1323 if (TREE_PUBLIC (newdecl))
1325 warning (0, "new declaration %q#D", newdecl);
1326 warning (0, "ambiguates built-in declaration %q#D",
1330 warning (OPT_Wshadow,
1331 DECL_BUILT_IN (olddecl)
1332 ? G_("shadowing built-in function %q#D")
1333 : G_("shadowing library function %q#D"), olddecl);
1336 /* Discard the old built-in function. */
1339 /* Replace the old RTL to avoid problems with inlining. */
1340 COPY_DECL_RTL (newdecl, olddecl);
1342 /* Even if the types match, prefer the new declarations type for
1343 built-ins which have not been explicitly declared, for
1344 exception lists, etc... */
1345 else if (DECL_IS_BUILTIN (olddecl))
1347 tree type = TREE_TYPE (newdecl);
1348 tree attribs = (*targetm.merge_type_attributes)
1349 (TREE_TYPE (olddecl), type);
1351 type = cp_build_type_attribute_variant (type, attribs);
1352 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1355 /* If a function is explicitly declared "throw ()", propagate that to
1356 the corresponding builtin. */
1357 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1358 && DECL_ANTICIPATED (olddecl)
1359 && TREE_NOTHROW (newdecl)
1360 && !TREE_NOTHROW (olddecl)
1361 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1362 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1364 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1366 /* Whether or not the builtin can throw exceptions has no
1367 bearing on this declarator. */
1368 TREE_NOTHROW (olddecl) = 0;
1370 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1372 /* If a builtin function is redeclared as `static', merge
1373 the declarations, but make the original one static. */
1374 DECL_THIS_STATIC (olddecl) = 1;
1375 TREE_PUBLIC (olddecl) = 0;
1377 /* Make the old declaration consistent with the new one so
1378 that all remnants of the builtin-ness of this function
1379 will be banished. */
1380 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1381 COPY_DECL_RTL (newdecl, olddecl);
1384 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1386 /* C++ Standard, 3.3, clause 4:
1387 "[Note: a namespace name or a class template name must be unique
1388 in its declarative region (7.3.2, clause 14). ]" */
1389 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1390 && TREE_CODE (newdecl) != NAMESPACE_DECL
1391 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1392 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1393 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1394 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1396 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1397 && TREE_CODE (newdecl) != TYPE_DECL)
1398 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1399 && TREE_CODE (olddecl) != TYPE_DECL))
1401 /* We do nothing special here, because C++ does such nasty
1402 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1403 get shadowed, and know that if we need to find a TYPE_DECL
1404 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1405 slot of the identifier. */
1409 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1410 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1411 || (TREE_CODE (olddecl) == FUNCTION_DECL
1412 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1416 error ("%q#D redeclared as different kind of symbol", newdecl);
1417 if (TREE_CODE (olddecl) == TREE_LIST)
1418 olddecl = TREE_VALUE (olddecl);
1419 error ("previous declaration of %q+#D", olddecl);
1421 return error_mark_node;
1423 else if (!types_match)
1425 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1426 /* These are certainly not duplicate declarations; they're
1427 from different scopes. */
1430 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1432 /* The name of a class template may not be declared to refer to
1433 any other template, class, function, object, namespace, value,
1434 or type in the same scope. */
1435 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1436 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1438 error ("declaration of template %q#D", newdecl);
1439 error ("conflicts with previous declaration %q+#D", olddecl);
1441 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1442 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1443 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1444 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1445 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1446 DECL_TEMPLATE_PARMS (olddecl))
1447 /* Template functions can be disambiguated by
1449 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1450 TREE_TYPE (TREE_TYPE (olddecl))))
1452 error ("new declaration %q#D", newdecl);
1453 error ("ambiguates old declaration %q+#D", olddecl);
1457 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1459 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1461 error ("declaration of C function %q#D conflicts with",
1463 error ("previous declaration %q+#D here", olddecl);
1466 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1467 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1471 return error_mark_node;
1478 error ("conflicting declaration %q#D", newdecl);
1479 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1480 return error_mark_node;
1483 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1484 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1485 && (!DECL_TEMPLATE_INFO (newdecl)
1486 || (DECL_TI_TEMPLATE (newdecl)
1487 != DECL_TI_TEMPLATE (olddecl))))
1488 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1489 && (!DECL_TEMPLATE_INFO (olddecl)
1490 || (DECL_TI_TEMPLATE (olddecl)
1491 != DECL_TI_TEMPLATE (newdecl))))))
1492 /* It's OK to have a template specialization and a non-template
1493 with the same type, or to have specializations of two
1494 different templates with the same type. Note that if one is a
1495 specialization, and the other is an instantiation of the same
1496 template, that we do not exit at this point. That situation
1497 can occur if we instantiate a template class, and then
1498 specialize one of its methods. This situation is valid, but
1499 the declarations must be merged in the usual way. */
1501 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1502 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1503 && !DECL_USE_TEMPLATE (newdecl))
1504 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1505 && !DECL_USE_TEMPLATE (olddecl))))
1506 /* One of the declarations is a template instantiation, and the
1507 other is not a template at all. That's OK. */
1509 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1511 /* In [namespace.alias] we have:
1513 In a declarative region, a namespace-alias-definition can be
1514 used to redefine a namespace-alias declared in that declarative
1515 region to refer only to the namespace to which it already
1518 Therefore, if we encounter a second alias directive for the same
1519 alias, we can just ignore the second directive. */
1520 if (DECL_NAMESPACE_ALIAS (newdecl)
1521 && (DECL_NAMESPACE_ALIAS (newdecl)
1522 == DECL_NAMESPACE_ALIAS (olddecl)))
1524 /* [namespace.alias]
1526 A namespace-name or namespace-alias shall not be declared as
1527 the name of any other entity in the same declarative region.
1528 A namespace-name defined at global scope shall not be
1529 declared as the name of any other entity in any global scope
1531 error ("declaration of namespace %qD conflicts with", newdecl);
1532 error ("previous declaration of namespace %q+D here", olddecl);
1533 return error_mark_node;
1537 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1540 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1541 if (DECL_NAME (olddecl) != NULL_TREE)
1542 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1543 ? "%q+#D previously defined here"
1544 : "%q+#D previously declared here", olddecl);
1545 return error_mark_node;
1547 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1548 && DECL_INITIAL (olddecl) != NULL_TREE
1549 && !prototype_p (TREE_TYPE (olddecl))
1550 && prototype_p (TREE_TYPE (newdecl)))
1552 /* Prototype decl follows defn w/o prototype. */
1553 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1554 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1555 "follows non-prototype definition here");
1557 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1558 || TREE_CODE (olddecl) == VAR_DECL)
1559 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1562 If two declarations of the same function or object
1563 specify different linkage-specifications ..., the program
1564 is ill-formed.... Except for functions with C++ linkage,
1565 a function declaration without a linkage specification
1566 shall not precede the first linkage specification for
1567 that function. A function can be declared without a
1568 linkage specification after an explicit linkage
1569 specification has been seen; the linkage explicitly
1570 specified in the earlier declaration is not affected by
1571 such a function declaration.
1573 DR 563 raises the question why the restrictions on
1574 functions should not also apply to objects. Older
1575 versions of G++ silently ignore the linkage-specification
1583 which is clearly wrong. Therefore, we now treat objects
1585 if (current_lang_depth () == 0)
1587 /* There is no explicit linkage-specification, so we use
1588 the linkage from the previous declaration. */
1589 if (!DECL_LANG_SPECIFIC (newdecl))
1590 retrofit_lang_decl (newdecl);
1591 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1595 error ("previous declaration of %q+#D with %qL linkage",
1596 olddecl, DECL_LANGUAGE (olddecl));
1597 error ("conflicts with new declaration with %qL linkage",
1598 DECL_LANGUAGE (newdecl));
1602 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1604 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1606 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1607 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1610 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1611 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1613 for (; t1 && t1 != void_list_node;
1614 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1615 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1617 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1620 permerror (input_location, "default argument given for parameter %d of %q#D",
1622 permerror (input_location, "after previous specification in %q+#D", olddecl);
1626 error ("default argument given for parameter %d of %q#D",
1628 error ("after previous specification in %q+#D",
1635 /* Do not merge an implicit typedef with an explicit one. In:
1639 typedef class A A __attribute__ ((foo));
1641 the attribute should apply only to the typedef. */
1642 if (TREE_CODE (olddecl) == TYPE_DECL
1643 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1644 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1647 /* If new decl is `static' and an `extern' was seen previously,
1649 warn_extern_redeclared_static (newdecl, olddecl);
1651 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1652 return error_mark_node;
1654 /* We have committed to returning 1 at this point. */
1655 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1657 /* Now that functions must hold information normally held
1658 by field decls, there is extra work to do so that
1659 declaration information does not get destroyed during
1661 if (DECL_VINDEX (olddecl))
1662 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1663 if (DECL_CONTEXT (olddecl))
1664 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1665 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1666 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1667 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1668 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1669 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1670 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1671 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1672 SET_OVERLOADED_OPERATOR_CODE
1673 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1674 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1676 /* Optionally warn about more than one declaration for the same
1677 name, but don't warn about a function declaration followed by a
1679 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1680 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1681 /* Don't warn about extern decl followed by definition. */
1682 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1683 /* Don't warn about friends, let add_friend take care of it. */
1684 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1686 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1687 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1690 if (DECL_DELETED_FN (newdecl))
1692 error ("deleted definition of %qD", newdecl);
1693 error ("after previous declaration %q+D", olddecl);
1695 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1698 /* Deal with C++: must preserve virtual function table size. */
1699 if (TREE_CODE (olddecl) == TYPE_DECL)
1701 tree newtype = TREE_TYPE (newdecl);
1702 tree oldtype = TREE_TYPE (olddecl);
1704 if (newtype != error_mark_node && oldtype != error_mark_node
1705 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1706 CLASSTYPE_FRIEND_CLASSES (newtype)
1707 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1709 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1712 /* Copy all the DECL_... slots specified in the new decl
1713 except for any that we copy here from the old type. */
1714 DECL_ATTRIBUTES (newdecl)
1715 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1717 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1721 old_result = DECL_TEMPLATE_RESULT (olddecl);
1722 new_result = DECL_TEMPLATE_RESULT (newdecl);
1723 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1724 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1725 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1726 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1728 DECL_ATTRIBUTES (old_result)
1729 = (*targetm.merge_decl_attributes) (old_result, new_result);
1731 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1733 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1734 && DECL_INITIAL (new_result))
1736 if (DECL_INITIAL (old_result))
1737 DECL_UNINLINABLE (old_result) = 1;
1739 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1740 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1741 DECL_NOT_REALLY_EXTERN (old_result)
1742 = DECL_NOT_REALLY_EXTERN (new_result);
1743 DECL_INTERFACE_KNOWN (old_result)
1744 = DECL_INTERFACE_KNOWN (new_result);
1745 DECL_DECLARED_INLINE_P (old_result)
1746 = DECL_DECLARED_INLINE_P (new_result);
1747 DECL_DISREGARD_INLINE_LIMITS (old_result)
1748 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1753 DECL_DECLARED_INLINE_P (old_result)
1754 |= DECL_DECLARED_INLINE_P (new_result);
1755 DECL_DISREGARD_INLINE_LIMITS (old_result)
1756 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1757 check_redeclaration_exception_specification (newdecl, olddecl);
1761 /* If the new declaration is a definition, update the file and
1762 line information on the declaration, and also make
1763 the old declaration the same definition. */
1764 if (DECL_INITIAL (new_result) != NULL_TREE)
1766 DECL_SOURCE_LOCATION (olddecl)
1767 = DECL_SOURCE_LOCATION (old_result)
1768 = DECL_SOURCE_LOCATION (newdecl);
1769 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1770 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1773 DECL_ARGUMENTS (old_result)
1774 = DECL_ARGUMENTS (new_result);
1775 for (parm = DECL_ARGUMENTS (old_result); parm;
1776 parm = DECL_CHAIN (parm))
1777 DECL_CONTEXT (parm) = old_result;
1786 /* Automatically handles default parameters. */
1787 tree oldtype = TREE_TYPE (olddecl);
1790 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1791 maybe_instantiate_noexcept (olddecl);
1793 /* Merge the data types specified in the two decls. */
1794 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1796 /* If merge_types produces a non-typedef type, just use the old type. */
1797 if (TREE_CODE (newdecl) == TYPE_DECL
1798 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1801 if (TREE_CODE (newdecl) == VAR_DECL)
1803 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1804 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1805 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1806 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1807 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1808 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1810 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1811 if (DECL_LANG_SPECIFIC (olddecl)
1812 && CP_DECL_THREADPRIVATE_P (olddecl))
1814 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1815 if (!DECL_LANG_SPECIFIC (newdecl))
1816 retrofit_lang_decl (newdecl);
1818 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1819 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1823 /* Do this after calling `merge_types' so that default
1824 parameters don't confuse us. */
1825 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1826 check_redeclaration_exception_specification (newdecl, olddecl);
1827 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1829 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1830 check_default_args (newdecl);
1832 /* Lay the type out, unless already done. */
1833 if (! same_type_p (newtype, oldtype)
1834 && TREE_TYPE (newdecl) != error_mark_node
1835 && !(processing_template_decl && uses_template_parms (newdecl)))
1836 layout_type (TREE_TYPE (newdecl));
1838 if ((TREE_CODE (newdecl) == VAR_DECL
1839 || TREE_CODE (newdecl) == PARM_DECL
1840 || TREE_CODE (newdecl) == RESULT_DECL
1841 || TREE_CODE (newdecl) == FIELD_DECL
1842 || TREE_CODE (newdecl) == TYPE_DECL)
1843 && !(processing_template_decl && uses_template_parms (newdecl)))
1844 layout_decl (newdecl, 0);
1846 /* Merge the type qualifiers. */
1847 if (TREE_READONLY (newdecl))
1848 TREE_READONLY (olddecl) = 1;
1849 if (TREE_THIS_VOLATILE (newdecl))
1850 TREE_THIS_VOLATILE (olddecl) = 1;
1851 if (TREE_NOTHROW (newdecl))
1852 TREE_NOTHROW (olddecl) = 1;
1854 /* Merge deprecatedness. */
1855 if (TREE_DEPRECATED (newdecl))
1856 TREE_DEPRECATED (olddecl) = 1;
1858 /* Preserve function specific target and optimization options */
1859 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1861 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1862 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1863 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1864 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1866 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1867 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1868 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1869 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1872 /* Merge the initialization information. */
1873 if (DECL_INITIAL (newdecl) == NULL_TREE
1874 && DECL_INITIAL (olddecl) != NULL_TREE)
1876 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1877 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1881 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1885 /* Merge the section attribute.
1886 We want to issue an error if the sections conflict but that must be
1887 done later in decl_attributes since we are called before attributes
1889 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1890 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1892 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1894 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1895 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1896 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1897 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1898 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1899 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1900 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1901 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1902 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1903 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1904 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1905 /* Keep the old RTL. */
1906 COPY_DECL_RTL (olddecl, newdecl);
1908 else if (TREE_CODE (newdecl) == VAR_DECL
1909 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1911 /* Keep the old RTL. We cannot keep the old RTL if the old
1912 declaration was for an incomplete object and the new
1913 declaration is not since many attributes of the RTL will
1915 COPY_DECL_RTL (olddecl, newdecl);
1918 /* If cannot merge, then use the new type and qualifiers,
1919 and don't preserve the old rtl. */
1922 /* Clean out any memory we had of the old declaration. */
1923 tree oldstatic = value_member (olddecl, static_aggregates);
1925 TREE_VALUE (oldstatic) = error_mark_node;
1927 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1928 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1929 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1930 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1933 /* Merge the storage class information. */
1934 merge_weak (newdecl, olddecl);
1936 if (DECL_ONE_ONLY (olddecl))
1937 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1939 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1940 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1941 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1942 if (! DECL_EXTERNAL (olddecl))
1943 DECL_EXTERNAL (newdecl) = 0;
1945 new_template_info = NULL_TREE;
1946 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1948 bool new_redefines_gnu_inline = false;
1950 if (new_defines_function
1951 && ((DECL_INTERFACE_KNOWN (olddecl)
1952 && TREE_CODE (olddecl) == FUNCTION_DECL)
1953 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1954 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1955 == FUNCTION_DECL))))
1959 if (TREE_CODE (fn) == TEMPLATE_DECL)
1960 fn = DECL_TEMPLATE_RESULT (olddecl);
1962 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1965 if (!new_redefines_gnu_inline)
1967 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1968 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1969 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1971 DECL_TEMPLATE_INSTANTIATED (newdecl)
1972 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1973 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1975 /* If the OLDDECL is an instantiation and/or specialization,
1976 then the NEWDECL must be too. But, it may not yet be marked
1977 as such if the caller has created NEWDECL, but has not yet
1978 figured out that it is a redeclaration. */
1979 if (!DECL_USE_TEMPLATE (newdecl))
1980 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1982 /* Don't really know how much of the language-specific
1983 values we should copy from old to new. */
1984 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1985 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1986 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1987 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1989 if (LANG_DECL_HAS_MIN (newdecl))
1991 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1992 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1993 if (DECL_TEMPLATE_INFO (newdecl))
1994 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1995 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1997 /* Only functions have these fields. */
1998 if (TREE_CODE (newdecl) == FUNCTION_DECL
1999 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2001 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2002 olddecl_friend = DECL_FRIEND_P (olddecl);
2003 hidden_friend = (DECL_ANTICIPATED (olddecl)
2004 && DECL_HIDDEN_FRIEND_P (olddecl)
2005 && newdecl_is_friend);
2006 DECL_BEFRIENDING_CLASSES (newdecl)
2007 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2008 DECL_BEFRIENDING_CLASSES (olddecl));
2009 /* DECL_THUNKS is only valid for virtual functions,
2010 otherwise it is a DECL_FRIEND_CONTEXT. */
2011 if (DECL_VIRTUAL_P (newdecl))
2012 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2014 /* Only variables have this field. */
2015 else if (TREE_CODE (newdecl) == VAR_DECL
2016 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2017 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2020 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2024 /* Merge parameter attributes. */
2025 tree oldarg, newarg;
2026 for (oldarg = DECL_ARGUMENTS(olddecl),
2027 newarg = DECL_ARGUMENTS(newdecl);
2029 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2030 DECL_ATTRIBUTES (newarg)
2031 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2032 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2035 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2036 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2038 /* If newdecl is not a specialization, then it is not a
2039 template-related function at all. And that means that we
2040 should have exited above, returning 0. */
2041 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2043 if (DECL_ODR_USED (olddecl))
2044 /* From [temp.expl.spec]:
2046 If a template, a member template or the member of a class
2047 template is explicitly specialized then that
2048 specialization shall be declared before the first use of
2049 that specialization that would cause an implicit
2050 instantiation to take place, in every translation unit in
2051 which such a use occurs. */
2052 error ("explicit specialization of %qD after first use",
2055 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2057 /* Don't propagate visibility from the template to the
2058 specialization here. We'll do that in determine_visibility if
2060 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2062 /* [temp.expl.spec/14] We don't inline explicit specialization
2063 just because the primary template says so. */
2065 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2066 the always_inline attribute. */
2067 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2068 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2070 if (DECL_DECLARED_INLINE_P (newdecl))
2071 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2073 DECL_ATTRIBUTES (newdecl)
2074 = remove_attribute ("always_inline",
2075 DECL_ATTRIBUTES (newdecl));
2078 else if (new_defines_function && DECL_INITIAL (olddecl))
2080 /* Never inline re-defined extern inline functions.
2081 FIXME: this could be better handled by keeping both
2082 function as separate declarations. */
2083 DECL_UNINLINABLE (newdecl) = 1;
2087 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2088 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2090 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2092 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2093 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2095 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2096 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2097 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2098 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2101 /* Preserve abstractness on cloned [cd]tors. */
2102 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2104 /* Update newdecl's parms to point at olddecl. */
2105 for (parm = DECL_ARGUMENTS (newdecl); parm;
2106 parm = DECL_CHAIN (parm))
2107 DECL_CONTEXT (parm) = olddecl;
2111 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2112 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2113 COPY_DECL_RTL (newdecl, olddecl);
2115 if (! types_match || new_defines_function)
2117 /* These need to be copied so that the names are available.
2118 Note that if the types do match, we'll preserve inline
2119 info and other bits, but if not, we won't. */
2120 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2121 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2123 if (new_defines_function)
2124 /* If defining a function declared with other language
2125 linkage, use the previously declared language linkage. */
2126 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2127 else if (types_match)
2129 /* If redeclaring a builtin function, and not a definition,
2130 it stays built in. */
2131 if (DECL_BUILT_IN (olddecl))
2133 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2134 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2135 /* If we're keeping the built-in definition, keep the rtl,
2136 regardless of declaration matches. */
2137 COPY_DECL_RTL (olddecl, newdecl);
2140 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2141 /* Don't clear out the arguments if we're just redeclaring a
2143 if (DECL_ARGUMENTS (olddecl))
2144 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2147 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2148 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2150 /* Now preserve various other info from the definition. */
2151 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2152 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2153 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2154 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2156 /* Warn about conflicting visibility specifications. */
2157 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2158 && DECL_VISIBILITY_SPECIFIED (newdecl)
2159 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2161 warning_at (input_location, OPT_Wattributes,
2162 "%q+D: visibility attribute ignored because it", newdecl);
2163 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2164 "conflicts with previous declaration here");
2166 /* Choose the declaration which specified visibility. */
2167 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2169 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2170 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2172 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2173 so keep this behavior. */
2174 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2176 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2177 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2179 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2180 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2181 if (TREE_CODE (newdecl) == FIELD_DECL)
2182 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2184 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2185 with that from NEWDECL below. */
2186 if (DECL_LANG_SPECIFIC (olddecl))
2188 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2189 != DECL_LANG_SPECIFIC (newdecl));
2190 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2193 /* Merge the USED information. */
2194 if (TREE_USED (olddecl))
2195 TREE_USED (newdecl) = 1;
2196 else if (TREE_USED (newdecl))
2197 TREE_USED (olddecl) = 1;
2198 if (TREE_CODE (newdecl) == VAR_DECL)
2200 if (DECL_READ_P (olddecl))
2201 DECL_READ_P (newdecl) = 1;
2202 else if (DECL_READ_P (newdecl))
2203 DECL_READ_P (olddecl) = 1;
2205 if (DECL_PRESERVE_P (olddecl))
2206 DECL_PRESERVE_P (newdecl) = 1;
2207 else if (DECL_PRESERVE_P (newdecl))
2208 DECL_PRESERVE_P (olddecl) = 1;
2210 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2214 function_size = sizeof (struct tree_decl_common);
2216 memcpy ((char *) olddecl + sizeof (struct tree_common),
2217 (char *) newdecl + sizeof (struct tree_common),
2218 function_size - sizeof (struct tree_common));
2220 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2221 (char *) newdecl + sizeof (struct tree_decl_common),
2222 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2223 if (new_template_info)
2224 /* If newdecl is a template instantiation, it is possible that
2225 the following sequence of events has occurred:
2227 o A friend function was declared in a class template. The
2228 class template was instantiated.
2230 o The instantiation of the friend declaration was
2231 recorded on the instantiation list, and is newdecl.
2233 o Later, however, instantiate_class_template called pushdecl
2234 on the newdecl to perform name injection. But, pushdecl in
2235 turn called duplicate_decls when it discovered that another
2236 declaration of a global function with the same name already
2239 o Here, in duplicate_decls, we decided to clobber newdecl.
2241 If we're going to do that, we'd better make sure that
2242 olddecl, and not newdecl, is on the list of
2243 instantiations so that if we try to do the instantiation
2244 again we won't get the clobbered declaration. */
2245 reregister_specialization (newdecl,
2251 size_t size = tree_code_size (TREE_CODE (olddecl));
2252 memcpy ((char *) olddecl + sizeof (struct tree_common),
2253 (char *) newdecl + sizeof (struct tree_common),
2254 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2255 switch (TREE_CODE (olddecl))
2265 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2266 (char *) newdecl + sizeof (struct tree_decl_common),
2267 size - sizeof (struct tree_decl_common)
2268 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2272 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2273 (char *) newdecl + sizeof (struct tree_decl_common),
2274 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2275 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2279 DECL_UID (olddecl) = olddecl_uid;
2281 DECL_FRIEND_P (olddecl) = 1;
2284 DECL_ANTICIPATED (olddecl) = 1;
2285 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2288 /* NEWDECL contains the merged attribute lists.
2289 Update OLDDECL to be the same. */
2290 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2292 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2293 so that encode_section_info has a chance to look at the new decl
2294 flags and attributes. */
2295 if (DECL_RTL_SET_P (olddecl)
2296 && (TREE_CODE (olddecl) == FUNCTION_DECL
2297 || (TREE_CODE (olddecl) == VAR_DECL
2298 && TREE_STATIC (olddecl))))
2299 make_decl_rtl (olddecl);
2301 /* The NEWDECL will no longer be needed. Because every out-of-class
2302 declaration of a member results in a call to duplicate_decls,
2303 freeing these nodes represents in a significant savings. */
2309 /* Return zero if the declaration NEWDECL is valid
2310 when the declaration OLDDECL (assumed to be for the same name)
2311 has already been seen.
2312 Otherwise return an error message format string with a %s
2313 where the identifier should go. */
2316 redeclaration_error_message (tree newdecl, tree olddecl)
2318 if (TREE_CODE (newdecl) == TYPE_DECL)
2320 /* Because C++ can put things into name space for free,
2321 constructs like "typedef struct foo { ... } foo"
2322 would look like an erroneous redeclaration. */
2323 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2326 return G_("redefinition of %q#D");
2328 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2330 /* If this is a pure function, its olddecl will actually be
2331 the original initialization to `0' (which we force to call
2332 abort()). Don't complain about redefinition in this case. */
2333 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2334 && DECL_INITIAL (olddecl) == NULL_TREE)
2337 /* If both functions come from different namespaces, this is not
2338 a redeclaration - this is a conflict with a used function. */
2339 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2340 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2341 && ! decls_match (olddecl, newdecl))
2342 return G_("%qD conflicts with used function");
2344 /* We'll complain about linkage mismatches in
2345 warn_extern_redeclared_static. */
2347 /* Defining the same name twice is no good. */
2348 if (DECL_INITIAL (olddecl) != NULL_TREE
2349 && DECL_INITIAL (newdecl) != NULL_TREE)
2351 if (DECL_NAME (olddecl) == NULL_TREE)
2352 return G_("%q#D not declared in class");
2353 else if (!GNU_INLINE_P (olddecl)
2354 || GNU_INLINE_P (newdecl))
2355 return G_("redefinition of %q#D");
2358 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2360 bool olda = GNU_INLINE_P (olddecl);
2361 bool newa = GNU_INLINE_P (newdecl);
2366 return G_("%q+D redeclared inline with "
2367 "%<gnu_inline%> attribute");
2369 return G_("%q+D redeclared inline without "
2370 "%<gnu_inline%> attribute");
2376 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2380 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2382 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2383 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2384 return G_("redefinition of %q#D");
2388 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2389 || (DECL_TEMPLATE_RESULT (newdecl)
2390 == DECL_TEMPLATE_RESULT (olddecl)))
2393 nt = DECL_TEMPLATE_RESULT (newdecl);
2394 if (DECL_TEMPLATE_INFO (nt))
2395 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2396 ot = DECL_TEMPLATE_RESULT (olddecl);
2397 if (DECL_TEMPLATE_INFO (ot))
2398 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2399 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2400 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2401 return G_("redefinition of %q#D");
2403 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2405 bool olda = GNU_INLINE_P (ot);
2406 bool newa = GNU_INLINE_P (nt);
2411 return G_("%q+D redeclared inline with "
2412 "%<gnu_inline%> attribute");
2414 return G_("%q+D redeclared inline without "
2415 "%<gnu_inline%> attribute");
2419 /* Core issue #226 (C++0x):
2421 If a friend function template declaration specifies a
2422 default template-argument, that declaration shall be a
2423 definition and shall be the only declaration of the
2424 function template in the translation unit. */
2425 if ((cxx_dialect != cxx98)
2426 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2427 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2428 /*is_primary=*/1, /*is_partial=*/0,
2429 /*is_friend_decl=*/2))
2430 return G_("redeclaration of friend %q#D "
2431 "may not have default template arguments");
2435 else if (TREE_CODE (newdecl) == VAR_DECL
2436 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2437 && (! DECL_LANG_SPECIFIC (olddecl)
2438 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2439 || DECL_THREAD_LOCAL_P (newdecl)))
2441 /* Only variables can be thread-local, and all declarations must
2442 agree on this property. */
2443 if (DECL_THREAD_LOCAL_P (newdecl))
2444 return G_("thread-local declaration of %q#D follows "
2445 "non-thread-local declaration");
2447 return G_("non-thread-local declaration of %q#D follows "
2448 "thread-local declaration");
2450 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2452 /* The objects have been declared at namespace scope. If either
2453 is a member of an anonymous union, then this is an invalid
2454 redeclaration. For example:
2460 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2461 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2462 return G_("redeclaration of %q#D");
2463 /* If at least one declaration is a reference, there is no
2464 conflict. For example:
2470 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2472 /* Reject two definitions. */
2473 return G_("redefinition of %q#D");
2477 /* Objects declared with block scope: */
2478 /* Reject two definitions, and reject a definition
2479 together with an external reference. */
2480 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2481 return G_("redeclaration of %q#D");
2486 /* Hash and equality functions for the named_label table. */
2489 named_label_entry_hash (const void *data)
2491 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2492 return DECL_UID (ent->label_decl);
2496 named_label_entry_eq (const void *a, const void *b)
2498 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2499 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2500 return ent_a->label_decl == ent_b->label_decl;
2503 /* Create a new label, named ID. */
2506 make_label_decl (tree id, int local_p)
2508 struct named_label_entry *ent;
2512 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2514 DECL_CONTEXT (decl) = current_function_decl;
2515 DECL_MODE (decl) = VOIDmode;
2516 C_DECLARED_LABEL_FLAG (decl) = local_p;
2518 /* Say where one reference is to the label, for the sake of the
2519 error if it is not defined. */
2520 DECL_SOURCE_LOCATION (decl) = input_location;
2522 /* Record the fact that this identifier is bound to this label. */
2523 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2525 /* Create the label htab for the function on demand. */
2527 named_labels = htab_create_ggc (13, named_label_entry_hash,
2528 named_label_entry_eq, NULL);
2530 /* Record this label on the list of labels used in this function.
2531 We do this before calling make_label_decl so that we get the
2532 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2533 ent = ggc_alloc_cleared_named_label_entry ();
2534 ent->label_decl = decl;
2536 slot = htab_find_slot (named_labels, ent, INSERT);
2537 gcc_assert (*slot == NULL);
2543 /* Look for a label named ID in the current function. If one cannot
2544 be found, create one. (We keep track of used, but undefined,
2545 labels, and complain about them at the end of a function.) */
2548 lookup_label_1 (tree id)
2552 /* You can't use labels at global scope. */
2553 if (current_function_decl == NULL_TREE)
2555 error ("label %qE referenced outside of any function", id);
2559 /* See if we've already got this label. */
2560 decl = IDENTIFIER_LABEL_VALUE (id);
2561 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2564 decl = make_label_decl (id, /*local_p=*/0);
2568 /* Wrapper for lookup_label_1. */
2571 lookup_label (tree id)
2574 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2575 ret = lookup_label_1 (id);
2576 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2580 /* Declare a local label named ID. */
2583 declare_local_label (tree id)
2586 cp_label_binding *bind;
2588 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2589 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2590 bind = VEC_safe_push (cp_label_binding, gc,
2591 current_binding_level->shadowed_labels, NULL);
2592 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2594 decl = make_label_decl (id, /*local_p=*/1);
2600 /* Returns nonzero if it is ill-formed to jump past the declaration of
2601 DECL. Returns 2 if it's also a real problem. */
2604 decl_jump_unsafe (tree decl)
2606 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2607 with automatic storage duration is not in scope to a point where it is
2608 in scope is ill-formed unless the variable has scalar type, class type
2609 with a trivial default constructor and a trivial destructor, a
2610 cv-qualified version of one of these types, or an array of one of the
2611 preceding types and is declared without an initializer (8.5). */
2612 tree type = TREE_TYPE (decl);
2614 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2615 || type == error_mark_node)
2618 type = strip_array_types (type);
2620 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2621 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2624 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2630 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2633 identify_goto (tree decl, const location_t *locus)
2636 permerror (input_location, "jump to label %qD", decl);
2638 permerror (input_location, "jump to case label");
2640 permerror (*locus, " from here");
2643 /* Check that a single previously seen jump to a newly defined label
2644 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2645 the jump context; NAMES are the names in scope in LEVEL at the jump
2646 context; LOCUS is the source position of the jump or 0. Returns
2647 true if all is well. */
2650 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2651 bool exited_omp, const location_t *locus)
2653 cp_binding_level *b;
2654 bool identified = false, saw_eh = false, saw_omp = false;
2658 identify_goto (decl, locus);
2659 error (" exits OpenMP structured block");
2660 identified = saw_omp = true;
2663 for (b = current_binding_level; b ; b = b->level_chain)
2665 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2667 for (new_decls = b->names; new_decls != old_decls;
2668 new_decls = DECL_CHAIN (new_decls))
2670 int problem = decl_jump_unsafe (new_decls);
2676 identify_goto (decl, locus);
2680 error (" crosses initialization of %q+#D", new_decls);
2682 permerror (input_location, " enters scope of %q+#D which has "
2683 "non-trivial destructor", new_decls);
2688 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2692 identify_goto (decl, locus);
2695 if (b->kind == sk_try)
2696 error (" enters try block");
2698 error (" enters catch block");
2701 if (b->kind == sk_omp && !saw_omp)
2705 identify_goto (decl, locus);
2708 error (" enters OpenMP structured block");
2717 check_previous_goto (tree decl, struct named_label_use_entry *use)
2719 check_previous_goto_1 (decl, use->binding_level,
2720 use->names_in_scope, use->in_omp_scope,
2721 &use->o_goto_locus);
2725 check_switch_goto (cp_binding_level* level)
2727 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2730 /* Check that a new jump to a label DECL is OK. Called by
2731 finish_goto_stmt. */
2734 check_goto (tree decl)
2736 struct named_label_entry *ent, dummy;
2737 bool saw_catch = false, identified = false;
2741 /* We can't know where a computed goto is jumping.
2742 So we assume that it's OK. */
2743 if (TREE_CODE (decl) != LABEL_DECL)
2746 /* We didn't record any information about this label when we created it,
2747 and there's not much point since it's trivial to analyze as a return. */
2748 if (decl == cdtor_label)
2751 dummy.label_decl = decl;
2752 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2753 gcc_assert (ent != NULL);
2755 /* If the label hasn't been defined yet, defer checking. */
2756 if (! DECL_INITIAL (decl))
2758 struct named_label_use_entry *new_use;
2760 /* Don't bother creating another use if the last goto had the
2761 same data, and will therefore create the same set of errors. */
2763 && ent->uses->names_in_scope == current_binding_level->names)
2766 new_use = ggc_alloc_named_label_use_entry ();
2767 new_use->binding_level = current_binding_level;
2768 new_use->names_in_scope = current_binding_level->names;
2769 new_use->o_goto_locus = input_location;
2770 new_use->in_omp_scope = false;
2772 new_use->next = ent->uses;
2773 ent->uses = new_use;
2777 if (ent->in_try_scope || ent->in_catch_scope
2778 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2780 permerror (input_location, "jump to label %q+D", decl);
2781 permerror (input_location, " from here");
2785 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2787 int u = decl_jump_unsafe (bad);
2789 if (u > 1 && DECL_ARTIFICIAL (bad))
2791 /* Can't skip init of __exception_info. */
2792 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2796 error (" skips initialization of %q+#D", bad);
2798 permerror (input_location, " enters scope of %q+#D which has "
2799 "non-trivial destructor", bad);
2802 if (ent->in_try_scope)
2803 error (" enters try block");
2804 else if (ent->in_catch_scope && !saw_catch)
2805 error (" enters catch block");
2807 if (ent->in_omp_scope)
2808 error (" enters OpenMP structured block");
2809 else if (flag_openmp)
2811 cp_binding_level *b;
2812 for (b = current_binding_level; b ; b = b->level_chain)
2814 if (b == ent->binding_level)
2816 if (b->kind == sk_omp)
2820 permerror (input_location, "jump to label %q+D", decl);
2821 permerror (input_location, " from here");
2824 error (" exits OpenMP structured block");
2831 /* Check that a return is ok wrt OpenMP structured blocks.
2832 Called by finish_return_stmt. Returns true if all is well. */
2835 check_omp_return (void)
2837 cp_binding_level *b;
2838 for (b = current_binding_level; b ; b = b->level_chain)
2839 if (b->kind == sk_omp)
2841 error ("invalid exit from OpenMP structured block");
2844 else if (b->kind == sk_function_parms)
2849 /* Define a label, specifying the location in the source file.
2850 Return the LABEL_DECL node for the label. */
2853 define_label_1 (location_t location, tree name)
2855 struct named_label_entry *ent, dummy;
2856 cp_binding_level *p;
2859 decl = lookup_label (name);
2861 dummy.label_decl = decl;
2862 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2863 gcc_assert (ent != NULL);
2865 /* After labels, make any new cleanups in the function go into their
2866 own new (temporary) binding contour. */
2867 for (p = current_binding_level;
2868 p->kind != sk_function_parms;
2870 p->more_cleanups_ok = 0;
2872 if (name == get_identifier ("wchar_t"))
2873 permerror (input_location, "label named wchar_t");
2875 if (DECL_INITIAL (decl) != NULL_TREE)
2877 error ("duplicate label %qD", decl);
2878 return error_mark_node;
2882 struct named_label_use_entry *use;
2884 /* Mark label as having been defined. */
2885 DECL_INITIAL (decl) = error_mark_node;
2886 /* Say where in the source. */
2887 DECL_SOURCE_LOCATION (decl) = location;
2889 ent->binding_level = current_binding_level;
2890 ent->names_in_scope = current_binding_level->names;
2892 for (use = ent->uses; use ; use = use->next)
2893 check_previous_goto (decl, use);
2900 /* Wrapper for define_label_1. */
2903 define_label (location_t location, tree name)
2906 timevar_start (TV_NAME_LOOKUP);
2907 ret = define_label_1 (location, name);
2908 timevar_stop (TV_NAME_LOOKUP);
2915 cp_binding_level *level;
2916 struct cp_switch *next;
2917 /* The SWITCH_STMT being built. */
2919 /* A splay-tree mapping the low element of a case range to the high
2920 element, or NULL_TREE if there is no high element. Used to
2921 determine whether or not a new case label duplicates an old case
2922 label. We need a tree, rather than simply a hash table, because
2923 of the GNU case range extension. */
2927 /* A stack of the currently active switch statements. The innermost
2928 switch statement is on the top of the stack. There is no need to
2929 mark the stack for garbage collection because it is only active
2930 during the processing of the body of a function, and we never
2931 collect at that point. */
2933 static struct cp_switch *switch_stack;
2935 /* Called right after a switch-statement condition is parsed.
2936 SWITCH_STMT is the switch statement being parsed. */
2939 push_switch (tree switch_stmt)
2941 struct cp_switch *p = XNEW (struct cp_switch);
2942 p->level = current_binding_level;
2943 p->next = switch_stack;
2944 p->switch_stmt = switch_stmt;
2945 p->cases = splay_tree_new (case_compare, NULL, NULL);
2952 struct cp_switch *cs = switch_stack;
2953 location_t switch_location;
2955 /* Emit warnings as needed. */
2956 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2957 if (!processing_template_decl)
2958 c_do_switch_warnings (cs->cases, switch_location,
2959 SWITCH_STMT_TYPE (cs->switch_stmt),
2960 SWITCH_STMT_COND (cs->switch_stmt));
2962 splay_tree_delete (cs->cases);
2963 switch_stack = switch_stack->next;
2967 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2968 condition. Note that if TYPE and VALUE are already integral we don't
2969 really do the conversion because the language-independent
2970 warning/optimization code will work better that way. */
2973 case_conversion (tree type, tree value)
2975 if (value == NULL_TREE)
2978 if (cxx_dialect >= cxx0x
2979 && (SCOPED_ENUM_P (type)
2980 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
2982 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2983 type = type_promotes_to (type);
2984 value = perform_implicit_conversion (type, value, tf_warning_or_error);
2986 return cxx_constant_value (value);
2989 /* Note that we've seen a definition of a case label, and complain if this
2990 is a bad place for one. */
2993 finish_case_label (location_t loc, tree low_value, tree high_value)
2996 cp_binding_level *p;
2999 if (processing_template_decl)
3003 /* For templates, just add the case label; we'll do semantic
3004 analysis at instantiation-time. */
3005 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3006 return add_stmt (build_case_label (low_value, high_value, label));
3009 /* Find the condition on which this switch statement depends. */
3010 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3011 if (cond && TREE_CODE (cond) == TREE_LIST)
3012 cond = TREE_VALUE (cond);
3014 if (!check_switch_goto (switch_stack->level))
3015 return error_mark_node;
3017 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3019 low_value = case_conversion (type, low_value);
3020 high_value = case_conversion (type, high_value);
3022 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3023 low_value, high_value);
3025 /* After labels, make any new cleanups in the function go into their
3026 own new (temporary) binding contour. */
3027 for (p = current_binding_level;
3028 p->kind != sk_function_parms;
3030 p->more_cleanups_ok = 0;
3035 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3038 typename_hash (const void* k)
3041 const_tree const t = (const_tree) k;
3043 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3044 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3049 typedef struct typename_info {
3057 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3058 really of type `typename_info*' */
3061 typename_compare (const void * k1, const void * k2)
3063 const_tree const t1 = (const_tree) k1;
3064 const typename_info *const t2 = (const typename_info *) k2;
3066 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3067 && TYPE_CONTEXT (t1) == t2->scope
3068 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3069 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3070 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3073 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3074 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3076 Returns the new TYPENAME_TYPE. */
3078 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3081 build_typename_type (tree context, tree name, tree fullname,
3082 enum tag_types tag_type)
3090 if (typename_htab == NULL)
3091 typename_htab = htab_create_ggc (61, &typename_hash,
3092 &typename_compare, NULL);
3094 ti.scope = FROB_CONTEXT (context);
3096 ti.template_id = fullname;
3097 ti.enum_p = tag_type == enum_type;
3098 ti.class_p = (tag_type == class_type
3099 || tag_type == record_type
3100 || tag_type == union_type);
3101 hash = (htab_hash_pointer (ti.scope)
3102 ^ htab_hash_pointer (ti.name));
3104 /* See if we already have this type. */
3105 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3110 /* Build the TYPENAME_TYPE. */
3111 t = cxx_make_type (TYPENAME_TYPE);
3112 TYPE_CONTEXT (t) = ti.scope;
3113 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3114 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3115 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3117 /* Build the corresponding TYPE_DECL. */
3118 d = build_decl (input_location, TYPE_DECL, name, t);
3119 TYPE_NAME (TREE_TYPE (d)) = d;
3120 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3121 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3122 DECL_ARTIFICIAL (d) = 1;
3124 /* Store it in the hash table. */
3127 /* TYPENAME_TYPEs must always be compared structurally, because
3128 they may or may not resolve down to another type depending on
3129 the currently open classes. */
3130 SET_TYPE_STRUCTURAL_EQUALITY (t);
3136 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3137 provided to name the type. Returns an appropriate type, unless an
3138 error occurs, in which case error_mark_node is returned. If we
3139 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3140 return that, rather than the _TYPE it corresponds to, in other
3141 cases we look through the type decl. If TF_ERROR is set, complain
3142 about errors, otherwise be quiet. */
3145 make_typename_type (tree context, tree name, enum tag_types tag_type,
3146 tsubst_flags_t complain)
3152 if (name == error_mark_node
3153 || context == NULL_TREE
3154 || context == error_mark_node)
3155 return error_mark_node;
3159 if (!(TYPE_LANG_SPECIFIC (name)
3160 && (CLASSTYPE_IS_TEMPLATE (name)
3161 || CLASSTYPE_USE_TEMPLATE (name))))
3162 name = TYPE_IDENTIFIER (name);
3164 /* Create a TEMPLATE_ID_EXPR for the type. */
3165 name = build_nt (TEMPLATE_ID_EXPR,
3166 CLASSTYPE_TI_TEMPLATE (name),
3167 CLASSTYPE_TI_ARGS (name));
3169 else if (TREE_CODE (name) == TYPE_DECL)
3170 name = DECL_NAME (name);
3174 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3176 name = TREE_OPERAND (name, 0);
3177 if (TREE_CODE (name) == TEMPLATE_DECL)
3178 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3179 else if (TREE_CODE (name) == OVERLOAD)
3181 error ("%qD is not a type", name);
3182 return error_mark_node;
3185 if (TREE_CODE (name) == TEMPLATE_DECL)
3187 error ("%qD used without template parameters", name);
3188 return error_mark_node;
3190 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3191 gcc_assert (TYPE_P (context));
3193 if (!MAYBE_CLASS_TYPE_P (context))
3195 if (complain & tf_error)
3196 error ("%q#T is not a class", context);
3197 return error_mark_node;
3200 /* When the CONTEXT is a dependent type, NAME could refer to a
3201 dependent base class of CONTEXT. But look inside it anyway
3202 if CONTEXT is a currently open scope, in case it refers to a
3203 member of the current instantiation or a non-dependent base;
3204 lookup will stop when we hit a dependent base. */
3205 if (!dependent_scope_p (context))
3206 /* We should only set WANT_TYPE when we're a nested typename type.
3207 Then we can give better diagnostics if we find a non-type. */
3208 t = lookup_field (context, name, 2, /*want_type=*/true);
3212 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3213 return build_typename_type (context, name, fullname, tag_type);
3215 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3219 if (complain & tf_error)
3220 error (want_template ? "no class template named %q#T in %q#T"
3221 : "no type named %q#T in %q#T", name, context);
3222 return error_mark_node;
3225 /* Pull out the template from an injected-class-name (or multiple). */
3227 t = maybe_get_template_decl_from_type_decl (t);
3229 if (TREE_CODE (t) == TREE_LIST)
3231 if (complain & tf_error)
3233 error ("lookup of %qT in %qT is ambiguous", name, context);
3234 print_candidates (t);
3236 return error_mark_node;
3239 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3241 if (complain & tf_error)
3242 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3244 return error_mark_node;
3246 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3248 if (complain & tf_error)
3249 error ("%<typename %T::%D%> names %q#T, which is not a type",
3251 return error_mark_node;
3254 if (complain & tf_error)
3255 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3257 /* If we are currently parsing a template and if T is a typedef accessed
3258 through CONTEXT then we need to remember and check access of T at
3259 template instantiation time. */
3260 add_typedef_to_current_template_for_access_check (t, context, input_location);
3263 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3265 /*entering_scope=*/0,
3266 tf_warning_or_error | tf_user);
3268 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3274 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3275 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3276 in which case error_mark_node is returned.
3278 If PARM_LIST is non-NULL, also make sure that the template parameter
3279 list of TEMPLATE_DECL matches.
3281 If COMPLAIN zero, don't complain about any errors that occur. */
3284 make_unbound_class_template (tree context, tree name, tree parm_list,
3285 tsubst_flags_t complain)
3291 name = TYPE_IDENTIFIER (name);
3292 else if (DECL_P (name))
3293 name = DECL_NAME (name);
3294 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3296 if (!dependent_type_p (context)
3297 || currently_open_class (context))
3299 tree tmpl = NULL_TREE;
3301 if (MAYBE_CLASS_TYPE_P (context))
3302 tmpl = lookup_field (context, name, 0, false);
3304 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3305 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3307 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3309 if (complain & tf_error)
3310 error ("no class template named %q#T in %q#T", name, context);
3311 return error_mark_node;
3315 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3317 if (complain & tf_error)
3319 error ("template parameters do not match template");
3320 error ("%q+D declared here", tmpl);
3322 return error_mark_node;
3325 if (complain & tf_error)
3326 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3331 /* Build the UNBOUND_CLASS_TEMPLATE. */
3332 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3333 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3334 TREE_TYPE (t) = NULL_TREE;
3335 SET_TYPE_STRUCTURAL_EQUALITY (t);
3337 /* Build the corresponding TEMPLATE_DECL. */
3338 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3339 TYPE_NAME (TREE_TYPE (d)) = d;
3340 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3341 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3342 DECL_ARTIFICIAL (d) = 1;
3343 DECL_TEMPLATE_PARMS (d) = parm_list;
3350 /* Push the declarations of builtin types into the namespace.
3351 RID_INDEX is the index of the builtin type in the array
3352 RID_POINTERS. NAME is the name used when looking up the builtin
3353 type. TYPE is the _TYPE node for the builtin type. */
3356 record_builtin_type (enum rid rid_index,
3360 tree rname = NULL_TREE, tname = NULL_TREE;
3361 tree tdecl = NULL_TREE;
3363 if ((int) rid_index < (int) RID_MAX)
3364 rname = ridpointers[(int) rid_index];
3366 tname = get_identifier (name);
3368 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3369 eliminated. Built-in types should not be looked up name; their
3370 names are keywords that the parser can recognize. However, there
3371 is code in c-common.c that uses identifier_global_value to look
3372 up built-in types by name. */
3375 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3376 DECL_ARTIFICIAL (tdecl) = 1;
3377 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3383 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3384 DECL_ARTIFICIAL (tdecl) = 1;
3386 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3389 if (!TYPE_NAME (type))
3390 TYPE_NAME (type) = tdecl;
3393 debug_hooks->type_decl (tdecl, 0);
3396 /* Record one of the standard Java types.
3397 * Declare it as having the given NAME.
3398 * If SIZE > 0, it is the size of one of the integral types;
3399 * otherwise it is the negative of the size of one of the other types. */
3402 record_builtin_java_type (const char* name, int size)
3407 type = build_nonstandard_integer_type (size, 0);
3408 type = build_distinct_type_copy (type);
3410 else if (size > -32)
3413 /* "__java_char" or ""__java_boolean". */
3414 type = build_nonstandard_integer_type (-size, 1);
3415 type = build_distinct_type_copy (type);
3416 /* Get the signed type cached and attached to the unsigned type,
3417 so it doesn't get garbage-collected at "random" times,
3418 causing potential codegen differences out of different UIDs
3419 and different alias set numbers. */
3420 stype = build_nonstandard_integer_type (-size, 0);
3421 stype = build_distinct_type_copy (stype);
3422 TREE_CHAIN (type) = stype;
3423 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3426 { /* "__java_float" or ""__java_double". */
3427 type = make_node (REAL_TYPE);
3428 TYPE_PRECISION (type) = - size;
3431 record_builtin_type (RID_MAX, name, type);
3432 decl = TYPE_NAME (type);
3434 /* Suppress generate debug symbol entries for these types,
3435 since for normal C++ they are just clutter.
3436 However, push_lang_context undoes this if extern "Java" is seen. */
3437 DECL_IGNORED_P (decl) = 1;
3439 TYPE_FOR_JAVA (type) = 1;
3443 /* Push a type into the namespace so that the back ends ignore it. */
3446 record_unknown_type (tree type, const char* name)
3448 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3449 TYPE_DECL, get_identifier (name), type));
3450 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3451 DECL_IGNORED_P (decl) = 1;
3452 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3453 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3454 TYPE_ALIGN (type) = 1;
3455 TYPE_USER_ALIGN (type) = 0;
3456 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3459 /* A string for which we should create an IDENTIFIER_NODE at
3462 typedef struct predefined_identifier
3464 /* The name of the identifier. */
3465 const char *const name;
3466 /* The place where the IDENTIFIER_NODE should be stored. */
3468 /* Nonzero if this is the name of a constructor or destructor. */
3469 const int ctor_or_dtor_p;
3470 } predefined_identifier;
3472 /* Create all the predefined identifiers. */
3475 initialize_predefined_identifiers (void)
3477 const predefined_identifier *pid;
3479 /* A table of identifiers to create at startup. */
3480 static const predefined_identifier predefined_identifiers[] = {
3481 { "C++", &lang_name_cplusplus, 0 },
3482 { "C", &lang_name_c, 0 },
3483 { "Java", &lang_name_java, 0 },
3484 /* Some of these names have a trailing space so that it is
3485 impossible for them to conflict with names written by users. */
3486 { "__ct ", &ctor_identifier, 1 },
3487 { "__base_ctor ", &base_ctor_identifier, 1 },
3488 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3489 { "__dt ", &dtor_identifier, 1 },
3490 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3491 { "__base_dtor ", &base_dtor_identifier, 1 },
3492 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3493 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3494 { "nelts", &nelts_identifier, 0 },
3495 { THIS_NAME, &this_identifier, 0 },
3496 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3497 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3498 { "_vptr", &vptr_identifier, 0 },
3499 { "__vtt_parm", &vtt_parm_identifier, 0 },
3500 { "::", &global_scope_name, 0 },
3501 { "std", &std_identifier, 0 },
3505 for (pid = predefined_identifiers; pid->name; ++pid)
3507 *pid->node = get_identifier (pid->name);
3508 if (pid->ctor_or_dtor_p)
3509 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3513 /* Create the predefined scalar types of C,
3514 and some nodes representing standard constants (0, 1, (void *)0).
3515 Initialize the global binding level.
3516 Make definitions for built-in primitive functions. */
3519 cxx_init_decl_processing (void)
3522 tree void_ftype_ptr;
3524 /* Create all the identifiers we need. */
3525 initialize_predefined_identifiers ();
3527 /* Create the global variables. */
3528 push_to_top_level ();
3530 current_function_decl = NULL_TREE;
3531 current_binding_level = NULL;
3532 /* Enter the global namespace. */
3533 gcc_assert (global_namespace == NULL_TREE);
3534 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3536 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3537 TREE_PUBLIC (global_namespace) = 1;
3538 begin_scope (sk_namespace, global_namespace);
3540 if (flag_visibility_ms_compat)
3541 default_visibility = VISIBILITY_HIDDEN;
3544 current_lang_name = lang_name_c;
3546 /* Create the `std' namespace. */
3547 push_namespace (std_identifier);
3548 std_node = current_namespace;
3551 c_common_nodes_and_builtins ();
3553 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3554 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3555 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3556 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3557 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3558 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3559 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3560 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3562 integer_two_node = build_int_cst (NULL_TREE, 2);
3564 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3565 truthvalue_type_node = boolean_type_node;
3566 truthvalue_false_node = boolean_false_node;
3567 truthvalue_true_node = boolean_true_node;
3569 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3570 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3571 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3574 record_builtin_type (RID_MAX, NULL, string_type_node);
3577 delta_type_node = ptrdiff_type_node;
3578 vtable_index_type = ptrdiff_type_node;
3580 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3581 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3582 void_ftype_ptr = build_function_type_list (void_type_node,
3583 ptr_type_node, NULL_TREE);
3585 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3587 /* C++ extensions */
3589 unknown_type_node = make_node (LANG_TYPE);
3590 record_unknown_type (unknown_type_node, "unknown type");
3592 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3593 TREE_TYPE (unknown_type_node) = unknown_type_node;
3595 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3597 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3598 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3600 init_list_type_node = make_node (LANG_TYPE);
3601 record_unknown_type (init_list_type_node, "init list");
3603 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3604 record_unknown_type (dependent_lambda_return_type_node,
3605 "undeduced lambda return type");
3608 /* Make sure we get a unique function type, so we can give
3609 its pointer type a name. (This wins for gdb.) */
3610 tree vfunc_type = make_node (FUNCTION_TYPE);
3611 TREE_TYPE (vfunc_type) = integer_type_node;
3612 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3613 layout_type (vfunc_type);
3615 vtable_entry_type = build_pointer_type (vfunc_type);
3617 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3620 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3621 layout_type (vtbl_type_node);
3622 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3623 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3624 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3625 layout_type (vtbl_ptr_type_node);
3626 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3628 push_namespace (get_identifier ("__cxxabiv1"));
3629 abi_node = current_namespace;
3632 global_type_node = make_node (LANG_TYPE);
3633 record_unknown_type (global_type_node, "global type");
3636 current_lang_name = lang_name_cplusplus;
3640 tree newtype, deltype;
3641 tree ptr_ftype_sizetype;
3645 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3646 if (cxx_dialect == cxx98)
3649 tree bad_alloc_type_node;
3650 tree bad_alloc_decl;
3652 push_namespace (std_identifier);
3653 bad_alloc_id = get_identifier ("bad_alloc");
3654 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3655 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3657 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3658 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3662 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3665 new_eh_spec = noexcept_false_spec;
3667 /* Ensure attribs.c is initialized. */
3670 = build_tree_list (get_identifier ("alloc_size"),
3671 build_tree_list (NULL_TREE, integer_one_node));
3672 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3673 newtype = build_exception_variant (newtype, new_eh_spec);
3674 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3675 push_cp_library_fn (NEW_EXPR, newtype);
3676 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3677 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3678 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3680 nullptr_type_node = make_node (NULLPTR_TYPE);
3681 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3682 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3683 TYPE_UNSIGNED (nullptr_type_node) = 1;
3684 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3685 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3686 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3687 nullptr_node = build_int_cst (nullptr_type_node, 0);
3691 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3693 /* Perform other language dependent initializations. */
3694 init_class_processing ();
3695 init_rtti_processing ();
3696 init_template_processing ();
3698 if (flag_exceptions)
3699 init_exception_processing ();
3701 if (! supports_one_only ())
3704 make_fname_decl = cp_make_fname_decl;
3705 start_fname_decls ();
3707 /* Show we use EH for cleanups. */
3708 if (flag_exceptions)
3709 using_eh_for_cleanups ();
3712 /* Generate an initializer for a function naming variable from
3713 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3714 filled in with the type of the init. */
3717 cp_fname_init (const char* name, tree *type_p)
3719 tree domain = NULL_TREE;
3721 tree init = NULL_TREE;
3726 length = strlen (name);
3727 domain = build_index_type (size_int (length));
3728 init = build_string (length + 1, name);
3731 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3732 type = build_cplus_array_type (type, domain);
3737 TREE_TYPE (init) = type;
3739 init = error_mark_node;
3744 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3745 the decl, LOC is the location to give the decl, NAME is the
3746 initialization string and TYPE_DEP indicates whether NAME depended
3747 on the type of the function. We make use of that to detect
3748 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3749 at the point of first use, so we mustn't push the decl now. */
3752 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3754 const char *const name = (type_dep && processing_template_decl
3755 ? NULL : fname_as_string (type_dep));
3757 tree init = cp_fname_init (name, &type);
3758 tree decl = build_decl (loc, VAR_DECL, id, type);
3761 free (CONST_CAST (char *, name));
3763 /* As we're using pushdecl_with_scope, we must set the context. */
3764 DECL_CONTEXT (decl) = current_function_decl;
3765 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3767 TREE_STATIC (decl) = 1;
3768 TREE_READONLY (decl) = 1;
3769 DECL_ARTIFICIAL (decl) = 1;
3771 TREE_USED (decl) = 1;
3773 if (current_function_decl)
3775 cp_binding_level *b = current_binding_level;
3776 if (b->kind == sk_function_parms)
3777 return error_mark_node;
3778 while (b->level_chain->kind != sk_function_parms)
3780 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3781 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3782 LOOKUP_ONLYCONVERTING);
3786 DECL_THIS_STATIC (decl) = true;
3787 pushdecl_top_level_and_finish (decl, init);
3794 builtin_function_1 (tree decl, tree context, bool is_global)
3796 tree id = DECL_NAME (decl);
3797 const char *name = IDENTIFIER_POINTER (id);
3799 retrofit_lang_decl (decl);
3801 DECL_ARTIFICIAL (decl) = 1;
3802 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3803 SET_DECL_LANGUAGE (decl, lang_c);
3804 /* Runtime library routines are, by definition, available in an
3805 external shared object. */
3806 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3807 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3809 DECL_CONTEXT (decl) = context;
3812 pushdecl_top_level (decl);
3816 /* A function in the user's namespace should have an explicit
3817 declaration before it is used. Mark the built-in function as
3818 anticipated but not actually declared. */
3819 if (name[0] != '_' || name[1] != '_')
3820 DECL_ANTICIPATED (decl) = 1;
3821 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3823 size_t len = strlen (name);
3825 /* Treat __*_chk fortification functions as anticipated as well,
3826 unless they are __builtin_*. */
3827 if (len > strlen ("___chk")
3828 && memcmp (name + len - strlen ("_chk"),
3829 "_chk", strlen ("_chk") + 1) == 0)
3830 DECL_ANTICIPATED (decl) = 1;
3837 cxx_builtin_function (tree decl)
3839 tree id = DECL_NAME (decl);
3840 const char *name = IDENTIFIER_POINTER (id);
3841 /* All builtins that don't begin with an '_' should additionally
3842 go in the 'std' namespace. */
3845 tree decl2 = copy_node(decl);
3846 push_namespace (std_identifier);
3847 builtin_function_1 (decl2, std_node, false);
3851 return builtin_function_1 (decl, NULL_TREE, false);
3854 /* Like cxx_builtin_function, but guarantee the function is added to the global
3855 scope. This is to allow function specific options to add new machine
3856 dependent builtins when the target ISA changes via attribute((target(...)))
3857 which saves space on program startup if the program does not use non-generic
3861 cxx_builtin_function_ext_scope (tree decl)
3864 tree id = DECL_NAME (decl);
3865 const char *name = IDENTIFIER_POINTER (id);
3866 /* All builtins that don't begin with an '_' should additionally
3867 go in the 'std' namespace. */
3870 tree decl2 = copy_node(decl);
3871 push_namespace (std_identifier);
3872 builtin_function_1 (decl2, std_node, true);
3876 return builtin_function_1 (decl, NULL_TREE, true);
3879 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3880 function. Not called directly. */
3883 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3885 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3886 DECL_EXTERNAL (fn) = 1;
3887 TREE_PUBLIC (fn) = 1;
3888 DECL_ARTIFICIAL (fn) = 1;
3889 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3890 SET_DECL_LANGUAGE (fn, lang_c);
3891 /* Runtime library routines are, by definition, available in an
3892 external shared object. */
3893 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3894 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3898 /* Returns the _DECL for a library function with C linkage.
3899 We assume that such functions never throw; if this is incorrect,
3900 callers should unset TREE_NOTHROW. */
3903 build_library_fn (tree name, tree type)
3905 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3906 TREE_NOTHROW (fn) = 1;
3910 /* Returns the _DECL for a library function with C++ linkage. */
3913 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3915 tree fn = build_library_fn_1 (name, operator_code, type);
3916 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3917 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3918 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3922 /* Like build_library_fn, but takes a C string instead of an
3926 build_library_fn_ptr (const char* name, tree type)
3928 return build_library_fn (get_identifier (name), type);
3931 /* Like build_cp_library_fn, but takes a C string instead of an
3935 build_cp_library_fn_ptr (const char* name, tree type)
3937 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3940 /* Like build_library_fn, but also pushes the function so that we will
3941 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3942 may throw exceptions listed in RAISES. */
3945 push_library_fn (tree name, tree type, tree raises)
3950 type = build_exception_variant (type, raises);
3952 fn = build_library_fn (name, type);
3953 pushdecl_top_level (fn);
3957 /* Like build_cp_library_fn, but also pushes the function so that it
3958 will be found by normal lookup. */
3961 push_cp_library_fn (enum tree_code operator_code, tree type)
3963 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3970 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3974 push_void_library_fn (tree name, tree parmtypes)
3976 tree type = build_function_type (void_type_node, parmtypes);
3977 return push_library_fn (name, type, NULL_TREE);
3980 /* Like push_library_fn, but also note that this function throws
3981 and does not return. Used for __throw_foo and the like. */
3984 push_throw_library_fn (tree name, tree type)
3986 tree fn = push_library_fn (name, type, NULL_TREE);
3987 TREE_THIS_VOLATILE (fn) = 1;
3988 TREE_NOTHROW (fn) = 0;
3992 /* When we call finish_struct for an anonymous union, we create
3993 default copy constructors and such. But, an anonymous union
3994 shouldn't have such things; this function undoes the damage to the
3995 anonymous union type T.
3997 (The reason that we create the synthesized methods is that we don't
3998 distinguish `union { int i; }' from `typedef union { int i; } U'.
3999 The first is an anonymous union; the second is just an ordinary
4003 fixup_anonymous_aggr (tree t)
4007 /* Wipe out memory of synthesized methods. */
4008 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4009 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4010 TYPE_HAS_COPY_CTOR (t) = 0;
4011 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4012 TYPE_HAS_COPY_ASSIGN (t) = 0;
4013 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4015 /* Splice the implicitly generated functions out of the TYPE_METHODS
4017 q = &TYPE_METHODS (t);
4020 if (DECL_ARTIFICIAL (*q))
4021 *q = TREE_CHAIN (*q);
4023 q = &DECL_CHAIN (*q);
4026 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4027 if (TYPE_METHODS (t))
4029 tree decl = TYPE_MAIN_DECL (t);
4031 if (TREE_CODE (t) != UNION_TYPE)
4032 error_at (DECL_SOURCE_LOCATION (decl),
4033 "an anonymous struct cannot have function members");
4035 error_at (DECL_SOURCE_LOCATION (decl),
4036 "an anonymous union cannot have function members");
4039 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4040 assignment operators (because they cannot have these methods themselves).
4041 For anonymous unions this is already checked because they are not allowed
4042 in any union, otherwise we have to check it. */
4043 if (TREE_CODE (t) != UNION_TYPE)
4047 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4048 if (TREE_CODE (field) == FIELD_DECL)
4050 type = TREE_TYPE (field);
4051 if (CLASS_TYPE_P (type))
4053 if (TYPE_NEEDS_CONSTRUCTING (type))
4054 error ("member %q+#D with constructor not allowed "
4055 "in anonymous aggregate", field);
4056 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4057 error ("member %q+#D with destructor not allowed "
4058 "in anonymous aggregate", field);
4059 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4060 error ("member %q+#D with copy assignment operator "
4061 "not allowed in anonymous aggregate", field);
4067 /* Make sure that a declaration with no declarator is well-formed, i.e.
4068 just declares a tagged type or anonymous union.
4070 Returns the type declared; or NULL_TREE if none. */
4073 check_tag_decl (cp_decl_specifier_seq *declspecs)
4075 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4076 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4077 /* If a class, struct, or enum type is declared by the DECLSPECS
4078 (i.e, if a class-specifier, enum-specifier, or non-typename
4079 elaborated-type-specifier appears in the DECLSPECS),
4080 DECLARED_TYPE is set to the corresponding type. */
4081 tree declared_type = NULL_TREE;
4082 bool error_p = false;
4084 if (declspecs->multiple_types_p)
4085 error ("multiple types in one declaration");
4086 else if (declspecs->redefined_builtin_type)
4088 if (!in_system_header)
4089 permerror (input_location, "redeclaration of C++ built-in type %qT",
4090 declspecs->redefined_builtin_type);
4095 && TYPE_P (declspecs->type)
4096 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4097 && MAYBE_CLASS_TYPE_P (declspecs->type))
4098 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4099 declared_type = declspecs->type;
4100 else if (declspecs->type == error_mark_node)
4102 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4103 permerror (input_location, "declaration does not declare anything");
4104 /* Check for an anonymous union. */
4105 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4106 && TYPE_ANONYMOUS_P (declared_type))
4108 /* 7/3 In a simple-declaration, the optional init-declarator-list
4109 can be omitted only when declaring a class (clause 9) or
4110 enumeration (7.2), that is, when the decl-specifier-seq contains
4111 either a class-specifier, an elaborated-type-specifier with
4112 a class-key (9.1), or an enum-specifier. In these cases and
4113 whenever a class-specifier or enum-specifier is present in the
4114 decl-specifier-seq, the identifiers in these specifiers are among
4115 the names being declared by the declaration (as class-name,
4116 enum-names, or enumerators, depending on the syntax). In such
4117 cases, and except for the declaration of an unnamed bit-field (9.6),
4118 the decl-specifier-seq shall introduce one or more names into the
4119 program, or shall redeclare a name introduced by a previous
4120 declaration. [Example:
4121 enum { }; // ill-formed
4122 typedef class { }; // ill-formed
4126 error ("missing type-name in typedef-declaration");
4129 /* Anonymous unions are objects, so they can have specifiers. */;
4130 SET_ANON_AGGR_TYPE_P (declared_type);
4132 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4133 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4138 if (declspecs->specs[(int)ds_inline]
4139 || declspecs->specs[(int)ds_virtual])
4140 error ("%qs can only be specified for functions",
4141 declspecs->specs[(int)ds_inline]
4142 ? "inline" : "virtual");
4144 && (!current_class_type
4145 || current_scope () != current_class_type))
4146 error ("%<friend%> can only be specified inside a class");
4147 else if (declspecs->specs[(int)ds_explicit])
4148 error ("%<explicit%> can only be specified for constructors");
4149 else if (declspecs->storage_class)
4150 error ("a storage class can only be specified for objects "
4152 else if (declspecs->specs[(int)ds_const]
4153 || declspecs->specs[(int)ds_volatile]
4154 || declspecs->specs[(int)ds_restrict]
4155 || declspecs->specs[(int)ds_thread])
4156 error ("qualifiers can only be specified for objects "
4158 else if (saw_typedef)
4159 warning (0, "%<typedef%> was ignored in this declaration");
4160 else if (declspecs->specs[(int) ds_constexpr])
4161 error ("%<constexpr%> cannot be used for type declarations");
4164 return declared_type;
4167 /* Called when a declaration is seen that contains no names to declare.
4168 If its type is a reference to a structure, union or enum inherited
4169 from a containing scope, shadow that tag name for the current scope
4170 with a forward reference.
4171 If its type defines a new named structure or union
4172 or defines an enum, it is valid but we need not do anything here.
4173 Otherwise, it is an error.
4175 C++: may have to grok the declspecs to learn about static,
4176 complain for anonymous unions.
4178 Returns the TYPE declared -- or NULL_TREE if none. */
4181 shadow_tag (cp_decl_specifier_seq *declspecs)
4183 tree t = check_tag_decl (declspecs);
4188 if (declspecs->attributes)
4190 warning (0, "attribute ignored in declaration of %q+#T", t);
4191 warning (0, "attribute for %q+#T must follow the %qs keyword",
4192 t, class_key_or_enum_as_string (t));
4196 if (maybe_process_partial_specialization (t) == error_mark_node)
4199 /* This is where the variables in an anonymous union are
4200 declared. An anonymous union declaration looks like:
4202 because there is no declarator after the union, the parser
4203 sends that declaration here. */
4204 if (ANON_AGGR_TYPE_P (t))
4206 fixup_anonymous_aggr (t);
4208 if (TYPE_FIELDS (t))
4210 tree decl = grokdeclarator (/*declarator=*/NULL,
4211 declspecs, NORMAL, 0, NULL);
4212 finish_anon_union (decl);
4219 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4222 groktypename (cp_decl_specifier_seq *type_specifiers,
4223 const cp_declarator *declarator,
4224 bool is_template_arg)
4228 enum decl_context context
4229 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4230 attrs = type_specifiers->attributes;
4231 type_specifiers->attributes = NULL_TREE;
4232 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4233 if (attrs && type != error_mark_node)
4235 if (CLASS_TYPE_P (type))
4236 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4237 "outside of definition", type);
4238 else if (MAYBE_CLASS_TYPE_P (type))
4239 /* A template type parameter or other dependent type. */
4240 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4241 "type %qT without an associated declaration", type);
4243 cplus_decl_attributes (&type, attrs, 0);
4248 /* Process a DECLARATOR for a function-scope variable declaration,
4249 namespace-scope variable declaration, or function declaration.
4250 (Function definitions go through start_function; class member
4251 declarations appearing in the body of the class go through
4252 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4253 If an error occurs, the error_mark_node is returned instead.
4255 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4256 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4257 for an explicitly defaulted function, or SD_DELETED for an explicitly
4258 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4259 implicitly initialized via a default constructor. ATTRIBUTES and
4260 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4261 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4262 set, the caller is responsible for calling pop_scope. */
4265 start_decl (const cp_declarator *declarator,
4266 cp_decl_specifier_seq *declspecs,
4269 tree prefix_attributes,
4270 tree *pushed_scope_p)
4278 *pushed_scope_p = NULL_TREE;
4280 /* An object declared as __attribute__((deprecated)) suppresses
4281 warnings of uses of other deprecated items. */
4282 if (lookup_attribute ("deprecated", attributes))
4283 deprecated_state = DEPRECATED_SUPPRESS;
4285 attributes = chainon (attributes, prefix_attributes);
4287 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4290 deprecated_state = DEPRECATED_NORMAL;
4292 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4293 || decl == error_mark_node)
4294 return error_mark_node;
4296 context = CP_DECL_CONTEXT (decl);
4297 if (context != global_namespace)
4298 *pushed_scope_p = push_scope (context);
4301 /* Is it valid for this decl to have an initializer at all?
4302 If not, set INITIALIZED to zero, which will indirectly
4303 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4304 switch (TREE_CODE (decl))
4307 error ("typedef %qD is initialized (use decltype instead)", decl);
4308 return error_mark_node;
4311 if (initialized == SD_DELETED)
4312 /* We'll handle the rest of the semantics later, but we need to
4313 set this now so it's visible to duplicate_decls. */
4314 DECL_DELETED_FN (decl) = 1;
4323 if (! toplevel_bindings_p ()
4324 && DECL_EXTERNAL (decl))
4325 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4327 DECL_EXTERNAL (decl) = 0;
4328 if (toplevel_bindings_p ())
4329 TREE_STATIC (decl) = 1;
4331 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4333 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4334 record_key_method_defined (decl);
4336 /* If this is a typedef that names the class for linkage purposes
4337 (7.1.3p8), apply any attributes directly to the type. */
4338 if (TREE_CODE (decl) == TYPE_DECL
4339 && TAGGED_TYPE_P (TREE_TYPE (decl))
4340 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4341 flags = ATTR_FLAG_TYPE_IN_PLACE;
4345 /* Set attributes here so if duplicate decl, will have proper attributes. */
4346 cplus_decl_attributes (&decl, attributes, flags);
4348 /* Dllimported symbols cannot be defined. Static data members (which
4349 can be initialized in-class and dllimported) go through grokfield,
4350 not here, so we don't need to exclude those decls when checking for
4352 if (initialized && DECL_DLLIMPORT_P (decl))
4354 error ("definition of %q#D is marked %<dllimport%>", decl);
4355 DECL_DLLIMPORT_P (decl) = 0;
4358 /* If #pragma weak was used, mark the decl weak now. */
4359 maybe_apply_pragma_weak (decl);
4361 if (TREE_CODE (decl) == FUNCTION_DECL
4362 && DECL_DECLARED_INLINE_P (decl)
4363 && DECL_UNINLINABLE (decl)
4364 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4365 warning (0, "inline function %q+D given attribute noinline", decl);
4367 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4369 if (TREE_CODE (decl) == VAR_DECL)
4371 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4372 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4373 error ("%q#D is not a static member of %q#T", decl, context);
4376 if (DECL_CONTEXT (field) != context)
4378 if (!same_type_p (DECL_CONTEXT (field), context))
4379 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4380 "to be defined as %<%T::%D%>",
4381 DECL_CONTEXT (field), DECL_NAME (decl),
4382 context, DECL_NAME (decl));
4383 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4385 if (processing_specialization
4386 && template_class_depth (context) == 0
4387 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4388 error ("template header not allowed in member definition "
4389 "of explicitly specialized class");
4390 /* Static data member are tricky; an in-class initialization
4391 still doesn't provide a definition, so the in-class
4392 declaration will have DECL_EXTERNAL set, but will have an
4393 initialization. Thus, duplicate_decls won't warn
4394 about this situation, and so we check here. */
4395 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4396 error ("duplicate initialization of %qD", decl);
4397 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4399 if (declspecs->specs[(int) ds_constexpr]
4400 && !DECL_DECLARED_CONSTEXPR_P (field))
4401 error ("%qD declared %<constexpr%> outside its class", field);
4406 tree field = check_classfn (context, decl,
4407 (processing_template_decl
4408 > template_class_depth (context))
4409 ? current_template_parms
4411 if (field && field != error_mark_node
4412 && duplicate_decls (decl, field,
4413 /*newdecl_is_friend=*/false))
4417 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4418 DECL_IN_AGGR_P (decl) = 0;
4419 /* Do not mark DECL as an explicit specialization if it was not
4420 already marked as an instantiation; a declaration should
4421 never be marked as a specialization unless we know what
4422 template is being specialized. */
4423 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4425 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4427 /* [temp.expl.spec] An explicit specialization of a static data
4428 member of a template is a definition if the declaration
4429 includes an initializer; otherwise, it is a declaration.
4431 We check for processing_specialization so this only applies
4432 to the new specialization syntax. */
4433 if (!initialized && processing_specialization)
4434 DECL_EXTERNAL (decl) = 1;
4437 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4438 /* Aliases are definitions. */
4440 permerror (input_location, "declaration of %q#D outside of class is not definition",
4444 was_public = TREE_PUBLIC (decl);
4446 /* Enter this declaration into the symbol table. */
4447 decl = maybe_push_decl (decl);
4449 if (processing_template_decl)
4450 decl = push_template_decl (decl);
4451 if (decl == error_mark_node)
4452 return error_mark_node;
4454 /* Tell the back end to use or not use .common as appropriate. If we say
4455 -fconserve-space, we want this to save .data space, at the expense of
4456 wrong semantics. If we say -fno-conserve-space, we want this to
4457 produce errors about redefs; to do this we force variables into the
4459 if (flag_conserve_space
4460 && TREE_CODE (decl) == VAR_DECL
4461 && TREE_PUBLIC (decl)
4462 && !DECL_THREAD_LOCAL_P (decl)
4463 && !have_global_bss_p ())
4464 DECL_COMMON (decl) = 1;
4466 if (TREE_CODE (decl) == VAR_DECL
4467 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4468 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4470 /* This is a const variable with implicit 'static'. Set
4471 DECL_THIS_STATIC so we can tell it from variables that are
4472 !TREE_PUBLIC because of the anonymous namespace. */
4473 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4474 DECL_THIS_STATIC (decl) = 1;
4477 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4478 start_decl_1 (decl, initialized);
4483 /* Process the declaration of a variable DECL. INITIALIZED is true
4484 iff DECL is explicitly initialized. (INITIALIZED is false if the
4485 variable is initialized via an implicitly-called constructor.)
4486 This function must be called for ordinary variables (including, for
4487 example, implicit instantiations of templates), but must not be
4488 called for template declarations. */
4491 start_decl_1 (tree decl, bool initialized)
4495 bool aggregate_definition_p;
4497 gcc_assert (!processing_template_decl);
4499 if (error_operand_p (decl))
4502 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4504 type = TREE_TYPE (decl);
4505 complete_p = COMPLETE_TYPE_P (type);
4506 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4508 /* If an explicit initializer is present, or if this is a definition
4509 of an aggregate, then we need a complete type at this point.
4510 (Scalars are always complete types, so there is nothing to
4511 check.) This code just sets COMPLETE_P; errors (if necessary)
4512 are issued below. */
4513 if ((initialized || aggregate_definition_p)
4515 && COMPLETE_TYPE_P (complete_type (type)))
4518 /* We will not yet have set TREE_READONLY on DECL if the type
4519 was "const", but incomplete, before this point. But, now, we
4520 have a complete type, so we can try again. */
4521 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4525 /* Is it valid for this decl to have an initializer at all? */
4527 /* Don't allow initializations for incomplete types except for
4528 arrays which might be completed by the initialization. */
4530 ; /* A complete type is ok. */
4531 else if (type_uses_auto (type))
4532 ; /* An auto type is ok. */
4533 else if (TREE_CODE (type) != ARRAY_TYPE)
4535 error ("variable %q#D has initializer but incomplete type", decl);
4536 type = TREE_TYPE (decl) = error_mark_node;
4538 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4540 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4541 error ("elements of array %q#D have incomplete type", decl);
4542 /* else we already gave an error in start_decl. */
4545 else if (aggregate_definition_p && !complete_p)
4547 if (type_uses_auto (type))
4548 error ("declaration of %q#D has no initializer", decl);
4550 error ("aggregate %q#D has incomplete type and cannot be defined",
4552 /* Change the type so that assemble_variable will give
4553 DECL an rtl we can live with: (mem (const_int 0)). */
4554 type = TREE_TYPE (decl) = error_mark_node;
4557 /* Create a new scope to hold this declaration if necessary.
4558 Whether or not a new scope is necessary cannot be determined
4559 until after the type has been completed; if the type is a
4560 specialization of a class template it is not until after
4561 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4562 will be set correctly. */
4563 maybe_push_cleanup_level (type);
4566 /* Handle initialization of references. DECL, TYPE, and INIT have the
4567 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4568 but will be set to a new CLEANUP_STMT if a temporary is created
4569 that must be destroyed subsequently.
4571 Returns an initializer expression to use to initialize DECL, or
4572 NULL if the initialization can be performed statically.
4574 Quotes on semantics can be found in ARM 8.4.3. */
4577 grok_reference_init (tree decl, tree type, tree init, tree *cleanup,
4582 if (init == NULL_TREE)
4584 if ((DECL_LANG_SPECIFIC (decl) == 0
4585 || DECL_IN_AGGR_P (decl) == 0)
4586 && ! DECL_THIS_EXTERN (decl))
4587 error ("%qD declared as reference but not initialized", decl);
4591 if (TREE_CODE (init) == TREE_LIST)
4592 init = build_x_compound_expr_from_list (init, ELK_INIT,
4593 tf_warning_or_error);
4595 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4596 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4597 /* Note: default conversion is only called in very special cases. */
4598 init = decay_conversion (init);
4600 /* Convert INIT to the reference type TYPE. This may involve the
4601 creation of a temporary, whose lifetime must be the same as that
4602 of the reference. If so, a DECL_EXPR for the temporary will be
4603 added just after the DECL_EXPR for DECL. That's why we don't set
4604 DECL_INITIAL for local references (instead assigning to them
4605 explicitly); we need to allow the temporary to be initialized
4607 tmp = initialize_reference (type, init, decl, cleanup, flags,
4608 tf_warning_or_error);
4609 if (DECL_DECLARED_CONSTEXPR_P (decl))
4611 tmp = cxx_constant_value (tmp);
4612 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4613 = reduced_constant_expression_p (tmp);
4616 if (tmp == error_mark_node)
4618 else if (tmp == NULL_TREE)
4620 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4624 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4627 DECL_INITIAL (decl) = tmp;
4632 /* Subroutine of check_initializer. We're initializing a DECL of
4633 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4634 extend the lifetime of the underlying array to match that of the decl,
4635 just like for reference initialization. CLEANUP is as for
4636 grok_reference_init. */
4639 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4642 tree aggr_init, array, arrtype;
4643 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4644 if (error_operand_p (init))
4645 return error_mark_node;
4647 aggr_init = TARGET_EXPR_INITIAL (init);
4648 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4649 arrtype = TREE_TYPE (array);
4651 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4652 array = TREE_OPERAND (array, 0);
4653 /* If the array is constant, finish_compound_literal already made it a
4654 static variable and we don't need to do anything here. */
4655 if (decl && TREE_CODE (array) == TARGET_EXPR)
4657 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4658 var = build_address (var);
4659 var = convert (arrtype, var);
4660 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4665 /* Designated initializers in arrays are not supported in GNU C++.
4666 The parser cannot detect this error since it does not know whether
4667 a given brace-enclosed initializer is for a class type or for an
4668 array. This function checks that CE does not use a designated
4669 initializer. If it does, an error is issued. Returns true if CE
4670 is valid, i.e., does not have a designated initializer. */
4673 check_array_designated_initializer (const constructor_elt *ce,
4674 unsigned HOST_WIDE_INT index)
4676 /* Designated initializers for array elements are not supported. */
4679 /* The parser only allows identifiers as designated
4681 if (ce->index == error_mark_node)
4682 error ("name used in a GNU-style designated "
4683 "initializer for an array");
4684 else if (TREE_CODE (ce->index) == INTEGER_CST)
4686 /* A C99 designator is OK if it matches the current index. */
4687 if (TREE_INT_CST_LOW (ce->index) == index)
4690 sorry ("non-trivial designated initializers not supported");
4694 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4695 error ("name %qD used in a GNU-style designated "
4696 "initializer for an array", ce->index);
4704 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4705 array until we finish parsing the initializer. If that's the
4706 situation we're in, update DECL accordingly. */
4709 maybe_deduce_size_from_array_init (tree decl, tree init)
4711 tree type = TREE_TYPE (decl);
4713 if (TREE_CODE (type) == ARRAY_TYPE
4714 && TYPE_DOMAIN (type) == NULL_TREE
4715 && TREE_CODE (decl) != TYPE_DECL)
4717 /* do_default is really a C-ism to deal with tentative definitions.
4718 But let's leave it here to ease the eventual merge. */
4719 int do_default = !DECL_EXTERNAL (decl);
4720 tree initializer = init ? init : DECL_INITIAL (decl);
4723 /* Check that there are no designated initializers in INIT, as
4724 those are not supported in GNU C++, and as the middle-end
4725 will crash if presented with a non-numeric designated
4727 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4729 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4730 constructor_elt *ce;
4732 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4733 if (!check_array_designated_initializer (ce, i))
4739 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4743 error ("initializer fails to determine size of %qD", decl);
4744 TREE_TYPE (decl) = error_mark_node;
4746 else if (failure == 2)
4750 error ("array size missing in %qD", decl);
4751 TREE_TYPE (decl) = error_mark_node;
4753 /* If a `static' var's size isn't known, make it extern as
4754 well as static, so it does not get allocated. If it's not
4755 `static', then don't mark it extern; finish_incomplete_decl
4756 will give it a default size and it will get allocated. */
4757 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4758 DECL_EXTERNAL (decl) = 1;
4760 else if (failure == 3)
4762 error ("zero-size array %qD", decl);
4763 TREE_TYPE (decl) = error_mark_node;
4767 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4769 relayout_decl (decl);
4773 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4774 any appropriate error messages regarding the layout. */
4777 layout_var_decl (tree decl)
4781 type = TREE_TYPE (decl);
4782 if (type == error_mark_node)
4785 /* If we haven't already layed out this declaration, do so now.
4786 Note that we must not call complete type for an external object
4787 because it's type might involve templates that we are not
4788 supposed to instantiate yet. (And it's perfectly valid to say
4789 `extern X x' for some incomplete type `X'.) */
4790 if (!DECL_EXTERNAL (decl))
4791 complete_type (type);
4792 if (!DECL_SIZE (decl)
4793 && TREE_TYPE (decl) != error_mark_node
4794 && (COMPLETE_TYPE_P (type)
4795 || (TREE_CODE (type) == ARRAY_TYPE
4796 && !TYPE_DOMAIN (type)
4797 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4798 layout_decl (decl, 0);
4800 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4802 /* An automatic variable with an incomplete type: that is an error.
4803 Don't talk about array types here, since we took care of that
4804 message in grokdeclarator. */
4805 error ("storage size of %qD isn%'t known", decl);
4806 TREE_TYPE (decl) = error_mark_node;
4809 /* Keep this code around in case we later want to control debug info
4810 based on whether a type is "used". (jason 1999-11-11) */
4812 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4813 /* Let debugger know it should output info for this type. */
4814 note_debug_info_needed (ttype);
4816 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4817 note_debug_info_needed (DECL_CONTEXT (decl));
4820 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4821 && DECL_SIZE (decl) != NULL_TREE
4822 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4824 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4825 constant_expression_warning (DECL_SIZE (decl));
4828 error ("storage size of %qD isn%'t constant", decl);
4829 TREE_TYPE (decl) = error_mark_node;
4834 /* If a local static variable is declared in an inline function, or if
4835 we have a weak definition, we must endeavor to create only one
4836 instance of the variable at link-time. */
4839 maybe_commonize_var (tree decl)
4841 /* Static data in a function with comdat linkage also has comdat
4843 if (TREE_STATIC (decl)
4844 /* Don't mess with __FUNCTION__. */
4845 && ! DECL_ARTIFICIAL (decl)
4846 && DECL_FUNCTION_SCOPE_P (decl)
4847 && vague_linkage_p (DECL_CONTEXT (decl)))
4851 /* With weak symbols, we simply make the variable COMDAT;
4852 that will cause copies in multiple translations units to
4854 comdat_linkage (decl);
4858 if (DECL_INITIAL (decl) == NULL_TREE
4859 || DECL_INITIAL (decl) == error_mark_node)
4861 /* Without weak symbols, we can use COMMON to merge
4862 uninitialized variables. */
4863 TREE_PUBLIC (decl) = 1;
4864 DECL_COMMON (decl) = 1;
4868 /* While for initialized variables, we must use internal
4869 linkage -- which means that multiple copies will not
4871 TREE_PUBLIC (decl) = 0;
4872 DECL_COMMON (decl) = 0;
4873 warning_at (input_location, 0,
4874 "sorry: semantics of inline function static "
4875 "data %q+#D are wrong (you%'ll wind up "
4876 "with multiple copies)", decl);
4877 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4878 " you can work around this by removing "
4883 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4884 /* Set it up again; we might have set DECL_INITIAL since the last
4886 comdat_linkage (decl);
4889 /* Issue an error message if DECL is an uninitialized const variable. */
4892 check_for_uninitialized_const_var (tree decl)
4894 tree type = strip_array_types (TREE_TYPE (decl));
4896 /* ``Unless explicitly declared extern, a const object does not have
4897 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4899 if (TREE_CODE (decl) == VAR_DECL
4900 && TREE_CODE (type) != REFERENCE_TYPE
4901 && CP_TYPE_CONST_P (type)
4902 && !DECL_INITIAL (decl))
4904 tree field = default_init_uninitialized_part (type);
4908 permerror (DECL_SOURCE_LOCATION (decl),
4909 "uninitialized const %qD", decl);
4911 if (CLASS_TYPE_P (type))
4913 tree defaulted_ctor;
4915 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4916 "%q#T has no user-provided default constructor", type);
4917 defaulted_ctor = in_class_defaulted_default_constructor (type);
4919 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4920 "constructor is not user-provided because it is "
4921 "explicitly defaulted in the class body");
4922 inform (0, "and the implicitly-defined constructor does not "
4923 "initialize %q+#D", field);
4928 /* Structure holding the current initializer being processed by reshape_init.
4929 CUR is a pointer to the current element being processed, END is a pointer
4930 after the last element present in the initializer. */
4931 typedef struct reshape_iterator_t
4933 constructor_elt *cur;
4934 constructor_elt *end;
4937 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4939 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4940 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4941 initialized. If there are no more such fields, the return value
4945 next_initializable_field (tree field)
4948 && (TREE_CODE (field) != FIELD_DECL
4949 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4950 || DECL_ARTIFICIAL (field)))
4951 field = DECL_CHAIN (field);
4956 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4957 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4958 INTEGER_CST representing the size of the array minus one (the maximum index),
4959 or NULL_TREE if the array was declared without specifying the size. D is
4960 the iterator within the constructor. */
4963 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4964 tsubst_flags_t complain)
4967 bool sized_array_p = (max_index != NULL_TREE);
4968 unsigned HOST_WIDE_INT max_index_cst = 0;
4969 unsigned HOST_WIDE_INT index;
4971 /* The initializer for an array is always a CONSTRUCTOR. */
4972 new_init = build_constructor (init_list_type_node, NULL);
4976 /* Minus 1 is used for zero sized arrays. */
4977 if (integer_all_onesp (max_index))
4980 if (host_integerp (max_index, 1))
4981 max_index_cst = tree_low_cst (max_index, 1);
4982 /* sizetype is sign extended, not zero extended. */
4984 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4988 /* Loop until there are no more initializers. */
4990 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4995 check_array_designated_initializer (d->cur, index);
4996 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4998 if (elt_init == error_mark_node)
4999 return error_mark_node;
5000 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5001 size_int (index), elt_init);
5002 if (!TREE_CONSTANT (elt_init))
5003 TREE_CONSTANT (new_init) = false;
5009 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5010 Parameters are the same of reshape_init_r. */
5013 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5015 tree max_index = NULL_TREE;
5017 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5019 if (TYPE_DOMAIN (type))
5020 max_index = array_type_nelts (type);
5022 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5025 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5026 Parameters are the same of reshape_init_r. */
5029 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5031 tree max_index = NULL_TREE;
5033 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5035 if (COMPOUND_LITERAL_P (d->cur->value))
5037 tree value = d->cur->value;
5038 if (!same_type_p (TREE_TYPE (value), type))
5040 if (complain & tf_error)
5041 error ("invalid type %qT as initializer for a vector of type %qT",
5042 TREE_TYPE (d->cur->value), type);
5043 value = error_mark_node;
5049 /* For a vector, we initialize it as an array of the appropriate size. */
5050 if (TREE_CODE (type) == VECTOR_TYPE)
5051 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5053 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5056 /* Subroutine of reshape_init_r, processes the initializers for classes
5057 or union. Parameters are the same of reshape_init_r. */
5060 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5061 tsubst_flags_t complain)
5066 gcc_assert (CLASS_TYPE_P (type));
5068 /* The initializer for a class is always a CONSTRUCTOR. */
5069 new_init = build_constructor (init_list_type_node, NULL);
5070 field = next_initializable_field (TYPE_FIELDS (type));
5076 An initializer for an aggregate member that is an
5077 empty class shall have the form of an empty
5078 initializer-list {}. */
5079 if (!first_initializer_p)
5081 if (complain & tf_error)
5082 error ("initializer for %qT must be brace-enclosed", type);
5083 return error_mark_node;
5088 /* Loop through the initializable fields, gathering initializers. */
5089 while (d->cur != d->end)
5093 /* Handle designated initializers, as an extension. */
5096 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5098 if (!field || TREE_CODE (field) != FIELD_DECL)
5100 if (complain & tf_error)
5101 error ("%qT has no non-static data member named %qD", type,
5103 return error_mark_node;
5107 /* If we processed all the member of the class, we are done. */
5111 field_init = reshape_init_r (TREE_TYPE (field), d,
5112 /*first_initializer_p=*/false, complain);
5113 if (field_init == error_mark_node)
5114 return error_mark_node;
5116 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5120 When a union is initialized with a brace-enclosed
5121 initializer, the braces shall only contain an
5122 initializer for the first member of the union. */
5123 if (TREE_CODE (type) == UNION_TYPE)
5126 field = next_initializable_field (DECL_CHAIN (field));
5132 /* Subroutine of reshape_init, which processes a single initializer (part of
5133 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5134 iterator within the CONSTRUCTOR which points to the initializer to process.
5135 FIRST_INITIALIZER_P is true if this is the first initializer of the
5136 outermost CONSTRUCTOR node. */
5139 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5140 tsubst_flags_t complain)
5142 tree init = d->cur->value;
5144 if (error_operand_p (init))
5145 return error_mark_node;
5147 if (TREE_CODE (type) == COMPLEX_TYPE)
5149 /* A complex type can be initialized from one or two initializers,
5150 but braces are not elided. */
5152 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5154 if (CONSTRUCTOR_NELTS (init) > 2)
5156 if (complain & tf_error)
5157 error ("too many initializers for %qT", type);
5159 return error_mark_node;
5162 else if (first_initializer_p && d->cur != d->end)
5164 VEC(constructor_elt, gc) *v = 0;
5165 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5166 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5168 init = build_constructor (init_list_type_node, v);
5173 /* A non-aggregate type is always initialized with a single
5175 if (!CP_AGGREGATE_TYPE_P (type))
5177 /* It is invalid to initialize a non-aggregate type with a
5178 brace-enclosed initializer before C++0x.
5179 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5180 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5181 a CONSTRUCTOR (with a record type). */
5182 if (TREE_CODE (init) == CONSTRUCTOR
5183 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5185 if (SCALAR_TYPE_P (type))
5187 if (complain & tf_error)
5188 error ("braces around scalar initializer for type %qT", type);
5189 init = error_mark_node;
5192 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5201 All implicit type conversions (clause _conv_) are considered when
5202 initializing the aggregate member with an initializer from an
5203 initializer-list. If the initializer can initialize a member,
5204 the member is initialized. Otherwise, if the member is itself a
5205 non-empty subaggregate, brace elision is assumed and the
5206 initializer is considered for the initialization of the first
5207 member of the subaggregate. */
5208 if (TREE_CODE (init) != CONSTRUCTOR
5209 /* But don't try this for the first initializer, since that would be
5210 looking through the outermost braces; A a2 = { a1 }; is not a
5211 valid aggregate initialization. */
5212 && !first_initializer_p
5213 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5214 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5220 /* [dcl.init.string]
5222 A char array (whether plain char, signed char, or unsigned char)
5223 can be initialized by a string-literal (optionally enclosed in
5224 braces); a wchar_t array can be initialized by a wide
5225 string-literal (optionally enclosed in braces). */
5226 if (TREE_CODE (type) == ARRAY_TYPE
5227 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5229 tree str_init = init;
5231 /* Strip one level of braces if and only if they enclose a single
5232 element (as allowed by [dcl.init.string]). */
5233 if (!first_initializer_p
5234 && TREE_CODE (str_init) == CONSTRUCTOR
5235 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5237 str_init = VEC_index (constructor_elt,
5238 CONSTRUCTOR_ELTS (str_init), 0)->value;
5241 /* If it's a string literal, then it's the initializer for the array
5242 as a whole. Otherwise, continue with normal initialization for
5243 array types (one value per array element). */
5244 if (TREE_CODE (str_init) == STRING_CST)
5251 /* The following cases are about aggregates. If we are not within a full
5252 initializer already, and there is not a CONSTRUCTOR, it means that there
5253 is a missing set of braces (that is, we are processing the case for
5254 which reshape_init exists). */
5255 if (!first_initializer_p)
5257 if (TREE_CODE (init) == CONSTRUCTOR)
5259 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5260 /* There is no need to reshape pointer-to-member function
5261 initializers, as they are always constructed correctly
5262 by the front end. */
5264 else if (COMPOUND_LITERAL_P (init))
5265 /* For a nested compound literal, there is no need to reshape since
5266 brace elision is not allowed. Even if we decided to allow it,
5267 we should add a call to reshape_init in finish_compound_literal,
5268 before calling digest_init, so changing this code would still
5269 not be necessary. */
5270 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5274 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5275 return reshape_init (type, init, complain);
5279 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5283 /* Dispatch to specialized routines. */
5284 if (CLASS_TYPE_P (type))
5285 return reshape_init_class (type, d, first_initializer_p, complain);
5286 else if (TREE_CODE (type) == ARRAY_TYPE)
5287 return reshape_init_array (type, d, complain);
5288 else if (TREE_CODE (type) == VECTOR_TYPE)
5289 return reshape_init_vector (type, d, complain);
5294 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5295 brace-enclosed aggregate initializer.
5297 INIT is the CONSTRUCTOR containing the list of initializers describing
5298 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5299 It may not presently match the shape of the TYPE; for example:
5301 struct S { int a; int b; };
5302 struct S a[] = { 1, 2, 3, 4 };
5304 Here INIT will hold a VEC of four elements, rather than a
5305 VEC of two elements, each itself a VEC of two elements. This
5306 routine transforms INIT from the former form into the latter. The
5307 revised CONSTRUCTOR node is returned. */
5310 reshape_init (tree type, tree init, tsubst_flags_t complain)
5312 VEC(constructor_elt, gc) *v;
5316 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5318 v = CONSTRUCTOR_ELTS (init);
5320 /* An empty constructor does not need reshaping, and it is always a valid
5322 if (VEC_empty (constructor_elt, v))
5325 /* Recurse on this CONSTRUCTOR. */
5326 d.cur = VEC_index (constructor_elt, v, 0);
5327 d.end = d.cur + VEC_length (constructor_elt, v);
5329 new_init = reshape_init_r (type, &d, true, complain);
5330 if (new_init == error_mark_node)
5331 return error_mark_node;
5333 /* Make sure all the element of the constructor were used. Otherwise,
5334 issue an error about exceeding initializers. */
5337 if (complain & tf_error)
5338 error ("too many initializers for %qT", type);
5340 return error_mark_node;
5346 /* Verify array initializer. Returns true if errors have been reported. */
5349 check_array_initializer (tree decl, tree type, tree init)
5351 tree element_type = TREE_TYPE (type);
5353 /* The array type itself need not be complete, because the
5354 initializer may tell us how many elements are in the array.
5355 But, the elements of the array must be complete. */
5356 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5359 error ("elements of array %q#D have incomplete type", decl);
5361 error ("elements of array %q#T have incomplete type", type);
5364 /* It is not valid to initialize a VLA. */
5366 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5367 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5370 error ("variable-sized object %qD may not be initialized", decl);
5372 error ("variable-sized compound literal");
5378 /* Subroutine of check_initializer; args are passed down from that function.
5379 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5382 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5385 int saved_stmts_are_full_exprs_p = 0;
5386 if (building_stmt_list_p ())
5388 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5389 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5391 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5392 if (building_stmt_list_p ())
5393 current_stmt_tree ()->stmts_are_full_exprs_p =
5394 saved_stmts_are_full_exprs_p;
5398 /* Verify INIT (the initializer for DECL), and record the
5399 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5400 grok_reference_init.
5402 If the return value is non-NULL, it is an expression that must be
5403 evaluated dynamically to initialize DECL. */
5406 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5408 tree type = TREE_TYPE (decl);
5409 tree init_code = NULL;
5410 tree extra_init = NULL_TREE;
5413 /* Things that are going to be initialized need to have complete
5415 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5417 if (DECL_HAS_VALUE_EXPR_P (decl))
5419 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5420 it doesn't have storage to be initialized. */
5421 gcc_assert (init == NULL_TREE);
5425 if (type == error_mark_node)
5426 /* We will have already complained. */
5429 if (TREE_CODE (type) == ARRAY_TYPE)
5431 if (check_array_initializer (decl, type, init))
5434 else if (!COMPLETE_TYPE_P (type))
5436 error ("%qD has incomplete type", decl);
5437 TREE_TYPE (decl) = error_mark_node;
5441 /* There is no way to make a variable-sized class type in GNU C++. */
5442 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5444 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5446 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5447 if (SCALAR_TYPE_P (type))
5451 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5452 init = build_zero_init (type, NULL_TREE, false);
5454 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5456 error ("scalar object %qD requires one element in initializer",
5458 TREE_TYPE (decl) = error_mark_node;
5464 if (TREE_CODE (decl) == CONST_DECL)
5466 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5468 DECL_INITIAL (decl) = init;
5470 gcc_assert (init != NULL_TREE);
5473 else if (!init && DECL_REALLY_EXTERN (decl))
5475 else if (TREE_CODE (type) == REFERENCE_TYPE)
5476 init = grok_reference_init (decl, type, init, cleanup, flags);
5477 else if (init || type_build_ctor_call (type))
5480 check_for_uninitialized_const_var (decl);
5481 /* Do not reshape constructors of vectors (they don't need to be
5483 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5485 if (is_std_init_list (type))
5486 init = build_init_list_var_init (decl, type, init,
5487 &extra_init, cleanup);
5488 else if (TYPE_NON_AGGREGATE_CLASS (type))
5490 /* Don't reshape if the class has constructors. */
5491 if (cxx_dialect == cxx98)
5492 error ("in C++98 %qD must be initialized by constructor, "
5496 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5498 error ("opaque vector types cannot be initialized");
5499 init = error_mark_node;
5503 init = reshape_init (type, init, tf_warning_or_error);
5504 if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
5505 check_narrowing (type, init);
5509 /* If DECL has an array type without a specific bound, deduce the
5510 array size from the initializer. */
5511 maybe_deduce_size_from_array_init (decl, init);
5512 type = TREE_TYPE (decl);
5513 if (type == error_mark_node)
5516 if (type_build_ctor_call (type)
5517 || (CLASS_TYPE_P (type)
5518 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5520 init_code = build_aggr_init_full_exprs (decl, init, flags);
5522 /* If this is a constexpr initializer, expand_default_init will
5523 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5524 case, pull the initializer back out and pass it down into
5525 store_init_value. */
5526 while (TREE_CODE (init_code) == EXPR_STMT
5527 || TREE_CODE (init_code) == CONVERT_EXPR)
5528 init_code = TREE_OPERAND (init_code, 0);
5529 if (TREE_CODE (init_code) == INIT_EXPR)
5531 init = TREE_OPERAND (init_code, 1);
5532 init_code = NULL_TREE;
5533 /* Don't call digest_init; it's unnecessary and will complain
5534 about aggregate initialization of non-aggregate classes. */
5535 flags |= LOOKUP_ALREADY_DIGESTED;
5537 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5539 /* Declared constexpr, but no suitable initializer; massage
5540 init appropriately so we can pass it into store_init_value
5542 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5543 init = finish_compound_literal (type, init,
5544 tf_warning_or_error);
5545 else if (CLASS_TYPE_P (type)
5546 && (!init || TREE_CODE (init) == TREE_LIST))
5548 init = build_functional_cast (type, init, tf_none);
5549 if (init != error_mark_node)
5550 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5552 init_code = NULL_TREE;
5558 if (init && TREE_CODE (init) != TREE_VEC)
5560 init_code = store_init_value (decl, init, flags);
5561 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5562 && DECL_INITIAL (decl)
5563 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5564 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5565 warning (0, "array %qD initialized by parenthesized string literal %qE",
5566 decl, DECL_INITIAL (decl));
5572 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5573 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5574 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5575 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5578 check_for_uninitialized_const_var (decl);
5581 if (init && init != error_mark_node)
5582 init_code = build2 (INIT_EXPR, type, decl, init);
5585 init_code = add_stmt_to_compound (extra_init, init_code);
5587 if (init_code && DECL_IN_AGGR_P (decl))
5589 static int explained = 0;
5591 if (cxx_dialect < cxx0x)
5592 error ("initializer invalid for static member with constructor");
5594 error ("non-constant in-class initialization invalid for static "
5595 "member %qD", decl);
5598 error ("(an out of class initialization is required)");
5606 /* If DECL is not a local variable, give it RTL. */
5609 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5611 int toplev = toplevel_bindings_p ();
5613 const char *filename;
5615 /* Set the DECL_ASSEMBLER_NAME for the object. */
5618 /* The `register' keyword, when used together with an
5619 asm-specification, indicates that the variable should be
5620 placed in a particular register. */
5621 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5623 set_user_assembler_name (decl, asmspec);
5624 DECL_HARD_REGISTER (decl) = 1;
5628 if (TREE_CODE (decl) == FUNCTION_DECL
5629 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5630 set_builtin_user_assembler_name (decl, asmspec);
5631 set_user_assembler_name (decl, asmspec);
5635 /* Handle non-variables up front. */
5636 if (TREE_CODE (decl) != VAR_DECL)
5638 rest_of_decl_compilation (decl, toplev, at_eof);
5642 /* If we see a class member here, it should be a static data
5644 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5646 gcc_assert (TREE_STATIC (decl));
5647 /* An in-class declaration of a static data member should be
5648 external; it is only a declaration, and not a definition. */
5649 if (init == NULL_TREE)
5650 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5653 /* We don't create any RTL for local variables. */
5654 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5657 /* We defer emission of local statics until the corresponding
5658 DECL_EXPR is expanded. */
5659 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5661 /* We try to defer namespace-scope static constants so that they are
5662 not emitted into the object file unnecessarily. */
5663 filename = input_filename;
5664 if (!DECL_VIRTUAL_P (decl)
5665 && TREE_READONLY (decl)
5666 && DECL_INITIAL (decl) != NULL_TREE
5667 && DECL_INITIAL (decl) != error_mark_node
5669 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5671 && !TREE_PUBLIC (decl))
5673 /* Fool with the linkage of static consts according to #pragma
5675 struct c_fileinfo *finfo = get_fileinfo (filename);
5676 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5678 TREE_PUBLIC (decl) = 1;
5679 DECL_EXTERNAL (decl) = finfo->interface_only;
5684 /* Likewise for template instantiations. */
5685 else if (DECL_LANG_SPECIFIC (decl)
5686 && DECL_IMPLICIT_INSTANTIATION (decl))
5689 /* If we're not deferring, go ahead and assemble the variable. */
5691 rest_of_decl_compilation (decl, toplev, at_eof);
5694 /* walk_tree helper for wrap_temporary_cleanups, below. */
5697 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5699 if (TYPE_P (*stmt_p))
5705 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5707 tree guard = (tree)data;
5708 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5710 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5711 /* Tell honor_protect_cleanup_actions to handle this as a separate
5713 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5715 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5721 /* We're initializing a local variable which has a cleanup GUARD. If there
5722 are any temporaries used in the initializer INIT of this variable, we
5723 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5724 variable will be cleaned up properly if one of them throws.
5726 Unfortunately, there's no way to express this properly in terms of
5727 nesting, as the regions for the temporaries overlap the region for the
5728 variable itself; if there are two temporaries, the variable needs to be
5729 the first thing destroyed if either of them throws. However, we only
5730 want to run the variable's cleanup if it actually got constructed. So
5731 we need to guard the temporary cleanups with the variable's cleanup if
5732 they are run on the normal path, but not if they are run on the
5733 exceptional path. We implement this by telling
5734 honor_protect_cleanup_actions to strip the variable cleanup from the
5735 exceptional path. */
5738 wrap_temporary_cleanups (tree init, tree guard)
5740 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5743 /* Generate code to initialize DECL (a local variable). */
5746 initialize_local_var (tree decl, tree init)
5748 tree type = TREE_TYPE (decl);
5752 gcc_assert (TREE_CODE (decl) == VAR_DECL
5753 || TREE_CODE (decl) == RESULT_DECL);
5754 gcc_assert (!TREE_STATIC (decl));
5756 if (DECL_SIZE (decl) == NULL_TREE)
5758 /* If we used it already as memory, it must stay in memory. */
5759 DECL_INITIAL (decl) = NULL_TREE;
5760 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5764 if (type == error_mark_node)
5767 /* Compute and store the initial value. */
5768 already_used = TREE_USED (decl) || TREE_USED (type);
5769 if (TREE_USED (type))
5770 DECL_READ_P (decl) = 1;
5772 /* Generate a cleanup, if necessary. */
5773 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5775 /* Perform the initialization. */
5778 if (TREE_CODE (init) == INIT_EXPR
5779 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5781 /* Stick simple initializers in DECL_INITIAL so that
5782 -Wno-init-self works (c++/34772). */
5783 gcc_assert (TREE_OPERAND (init, 0) == decl);
5784 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5788 int saved_stmts_are_full_exprs_p;
5790 /* If we're only initializing a single object, guard the
5791 destructors of any temporaries used in its initializer with
5792 its destructor. This isn't right for arrays because each
5793 element initialization is a full-expression. */
5794 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5795 wrap_temporary_cleanups (init, cleanup);
5797 gcc_assert (building_stmt_list_p ());
5798 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5799 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5800 finish_expr_stmt (init);
5801 current_stmt_tree ()->stmts_are_full_exprs_p =
5802 saved_stmts_are_full_exprs_p;
5806 /* Set this to 0 so we can tell whether an aggregate which was
5807 initialized was ever used. Don't do this if it has a
5808 destructor, so we don't complain about the 'resource
5809 allocation is initialization' idiom. Now set
5810 attribute((unused)) on types so decls of that type will be
5811 marked used. (see TREE_USED, above.) */
5812 if (TYPE_NEEDS_CONSTRUCTING (type)
5814 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5815 && DECL_NAME (decl))
5816 TREE_USED (decl) = 0;
5817 else if (already_used)
5818 TREE_USED (decl) = 1;
5821 finish_decl_cleanup (decl, cleanup);
5824 /* DECL is a VAR_DECL for a compiler-generated variable with static
5825 storage duration (like a virtual table) whose initializer is a
5826 compile-time constant. Initialize the variable and provide it to the
5830 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5833 gcc_assert (DECL_ARTIFICIAL (decl));
5834 init = build_constructor (TREE_TYPE (decl), v);
5835 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5836 DECL_INITIAL (decl) = init;
5837 DECL_INITIALIZED_P (decl) = 1;
5838 determine_visibility (decl);
5839 layout_var_decl (decl);
5840 maybe_commonize_var (decl);
5841 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5844 /* INIT is the initializer for a variable, as represented by the
5845 parser. Returns true iff INIT is type-dependent. */
5848 type_dependent_init_p (tree init)
5850 if (TREE_CODE (init) == TREE_LIST)
5851 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5852 return any_type_dependent_elements_p (init);
5853 else if (TREE_CODE (init) == CONSTRUCTOR)
5854 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5856 VEC(constructor_elt, gc) *elts;
5860 elts = CONSTRUCTOR_ELTS (init);
5861 nelts = VEC_length (constructor_elt, elts);
5862 for (i = 0; i < nelts; ++i)
5863 if (type_dependent_init_p (VEC_index (constructor_elt,
5868 /* It must be a simple expression, e.g., int i = 3; */
5869 return type_dependent_expression_p (init);
5874 /* INIT is the initializer for a variable, as represented by the
5875 parser. Returns true iff INIT is value-dependent. */
5878 value_dependent_init_p (tree init)
5880 if (TREE_CODE (init) == TREE_LIST)
5881 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5882 return any_value_dependent_elements_p (init);
5883 else if (TREE_CODE (init) == CONSTRUCTOR)
5884 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5886 VEC(constructor_elt, gc) *elts;
5890 elts = CONSTRUCTOR_ELTS (init);
5891 nelts = VEC_length (constructor_elt, elts);
5892 for (i = 0; i < nelts; ++i)
5893 if (value_dependent_init_p (VEC_index (constructor_elt,
5898 /* It must be a simple expression, e.g., int i = 3; */
5899 return value_dependent_expression_p (init);
5904 /* Finish processing of a declaration;
5905 install its line number and initial value.
5906 If the length of an array type is not known before,
5907 it must be determined now, from the initial value, or it is an error.
5909 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5910 true, then INIT is an integral constant expression.
5912 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5913 if the (init) syntax was used. */
5916 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5917 tree asmspec_tree, int flags)
5921 const char *asmspec = NULL;
5922 int was_readonly = 0;
5923 bool var_definition_p = false;
5926 if (decl == error_mark_node)
5931 error ("assignment (not initialization) in declaration");
5935 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5936 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5937 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5939 type = TREE_TYPE (decl);
5940 if (type == error_mark_node)
5943 /* Assume no cleanup is required. */
5944 cleanup = NULL_TREE;
5946 /* If a name was specified, get the string. */
5947 if (at_namespace_scope_p ())
5948 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5949 if (asmspec_tree && asmspec_tree != error_mark_node)
5950 asmspec = TREE_STRING_POINTER (asmspec_tree);
5952 if (current_class_type
5953 && CP_DECL_CONTEXT (decl) == current_class_type
5954 && TYPE_BEING_DEFINED (current_class_type)
5955 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5956 && (DECL_INITIAL (decl) || init))
5957 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5959 auto_node = type_uses_auto (type);
5963 if (init == NULL_TREE)
5965 error ("declaration of %q#D has no initializer", decl);
5966 TREE_TYPE (decl) = error_mark_node;
5970 if (TREE_CODE (d_init) == TREE_LIST)
5971 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5972 tf_warning_or_error);
5973 d_init = resolve_nondeduced_context (d_init);
5974 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5976 if (type == error_mark_node)
5980 if (!ensure_literal_type_for_constexpr_object (decl))
5981 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5983 if (TREE_CODE (decl) == VAR_DECL
5984 && DECL_CLASS_SCOPE_P (decl)
5985 && DECL_INITIALIZED_IN_CLASS_P (decl))
5986 check_static_variable_definition (decl, type);
5988 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5991 if (init == ridpointers[(int)RID_DELETE])
5993 /* FIXME check this is 1st decl. */
5994 DECL_DELETED_FN (decl) = 1;
5995 DECL_DECLARED_INLINE_P (decl) = 1;
5996 DECL_INITIAL (decl) = error_mark_node;
5997 FOR_EACH_CLONE (clone, decl)
5999 DECL_DELETED_FN (clone) = 1;
6000 DECL_DECLARED_INLINE_P (clone) = 1;
6001 DECL_INITIAL (clone) = error_mark_node;
6005 else if (init == ridpointers[(int)RID_DEFAULT])
6007 if (defaultable_fn_check (decl))
6008 DECL_DEFAULTED_FN (decl) = 1;
6010 DECL_INITIAL (decl) = NULL_TREE;
6014 if (init && TREE_CODE (decl) == VAR_DECL)
6016 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6017 /* If DECL is a reference, then we want to know whether init is a
6018 reference constant; init_const_expr_p as passed tells us whether
6019 it's an rvalue constant. */
6020 if (TREE_CODE (type) == REFERENCE_TYPE)
6021 init_const_expr_p = potential_constant_expression (init);
6022 if (init_const_expr_p)
6024 /* Set these flags now for templates. We'll update the flags in
6025 store_init_value for instantiations. */
6026 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6027 if (decl_maybe_constant_var_p (decl))
6028 TREE_CONSTANT (decl) = 1;
6032 if (processing_template_decl)
6034 bool type_dependent_p;
6036 /* Add this declaration to the statement-tree. */
6037 if (at_function_scope_p ())
6038 add_decl_expr (decl);
6040 type_dependent_p = dependent_type_p (type);
6042 if (check_for_bare_parameter_packs (init))
6045 DECL_INITIAL (decl) = NULL_TREE;
6048 /* Generally, initializers in templates are expanded when the
6049 template is instantiated. But, if DECL is a variable constant
6050 then it can be used in future constant expressions, so its value
6051 must be available. */
6053 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6054 /* We can't do anything if the decl has dependent type. */;
6056 && init_const_expr_p
6057 && !type_dependent_p
6058 && decl_maybe_constant_var_p (decl)
6059 && !type_dependent_init_p (init)
6060 && !value_dependent_init_p (init))
6062 /* This variable seems to be a non-dependent constant, so process
6063 its initializer. If check_initializer returns non-null the
6064 initialization wasn't constant after all. */
6065 tree init_code = check_initializer (decl, init, flags, &cleanup);
6066 if (init_code == NULL_TREE)
6069 else if (!DECL_PRETTY_FUNCTION_P (decl))
6070 /* Deduce array size even if the initializer is dependent. */
6071 maybe_deduce_size_from_array_init (decl, init);
6074 DECL_INITIAL (decl) = init;
6078 /* Just store non-static data member initializers for later. */
6079 if (init && TREE_CODE (decl) == FIELD_DECL)
6080 DECL_INITIAL (decl) = digest_init_flags (TREE_TYPE (decl), init, flags);
6082 /* Take care of TYPE_DECLs up front. */
6083 if (TREE_CODE (decl) == TYPE_DECL)
6085 if (type != error_mark_node
6086 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6088 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6089 warning (0, "shadowing previous type declaration of %q#D", decl);
6090 set_identifier_type_value (DECL_NAME (decl), decl);
6093 /* If we have installed this as the canonical typedef for this
6094 type, and that type has not been defined yet, delay emitting
6095 the debug information for it, as we will emit it later. */
6096 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6097 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6098 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6100 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6105 /* A reference will be modified here, as it is initialized. */
6106 if (! DECL_EXTERNAL (decl)
6107 && TREE_READONLY (decl)
6108 && TREE_CODE (type) == REFERENCE_TYPE)
6111 TREE_READONLY (decl) = 0;
6114 if (TREE_CODE (decl) == VAR_DECL)
6116 /* Only variables with trivial initialization and destruction can
6117 have thread-local storage. */
6118 if (DECL_THREAD_LOCAL_P (decl)
6119 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6120 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6121 error ("%qD cannot be thread-local because it has non-trivial "
6122 "type %qT", decl, TREE_TYPE (decl));
6123 /* If this is a local variable that will need a mangled name,
6124 register it now. We must do this before processing the
6125 initializer for the variable, since the initialization might
6126 require a guard variable, and since the mangled name of the
6127 guard variable will depend on the mangled name of this
6129 if (DECL_FUNCTION_SCOPE_P (decl)
6130 && TREE_STATIC (decl)
6131 && !DECL_ARTIFICIAL (decl))
6133 push_local_name (decl);
6134 if (DECL_CONSTRUCTOR_P (current_function_decl)
6135 || DECL_DESTRUCTOR_P (current_function_decl))
6136 /* Normally local_decls is populated during GIMPLE lowering,
6137 but [cd]tors are never actually compiled directly. We need
6138 to put statics on the list so we can deal with the label
6139 address extension. */
6140 add_local_decl (cfun, decl);
6143 /* Convert the initializer to the type of DECL, if we have not
6144 already initialized DECL. */
6145 if (!DECL_INITIALIZED_P (decl)
6146 /* If !DECL_EXTERNAL then DECL is being defined. In the
6147 case of a static data member initialized inside the
6148 class-specifier, there can be an initializer even if DECL
6149 is *not* defined. */
6150 && (!DECL_EXTERNAL (decl) || init))
6152 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6155 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6156 /* Allow libjava/prims.cc define primitive classes. */
6157 if (init != NULL_TREE
6158 || jclass == NULL_TREE
6159 || TREE_CODE (jclass) != TYPE_DECL
6160 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6161 || !same_type_ignoring_top_level_qualifiers_p
6162 (type, TREE_TYPE (TREE_TYPE (jclass))))
6163 error ("Java object %qD not allocated with %<new%>", decl);
6166 init = check_initializer (decl, init, flags, &cleanup);
6167 /* Thread-local storage cannot be dynamically initialized. */
6168 if (DECL_THREAD_LOCAL_P (decl) && init)
6170 error ("%qD is thread-local and so cannot be dynamically "
6171 "initialized", decl);
6175 /* Check that the initializer for a static data member was a
6176 constant. Although we check in the parser that the
6177 initializer is an integral constant expression, we do not
6178 simplify division-by-zero at the point at which it
6179 occurs. Therefore, in:
6181 struct S { static const int i = 7 / 0; };
6183 we issue an error at this point. It would
6184 probably be better to forbid division by zero in
6185 integral constant expressions. */
6186 if (DECL_EXTERNAL (decl) && init)
6188 error ("%qD cannot be initialized by a non-constant expression"
6189 " when being declared", decl);
6190 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6198 The memory occupied by any object of static storage
6199 duration is zero-initialized at program startup before
6200 any other initialization takes place.
6202 We cannot create an appropriate initializer until after
6203 the type of DECL is finalized. If DECL_INITIAL is set,
6204 then the DECL is statically initialized, and any
6205 necessary zero-initialization has already been performed. */
6206 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6207 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6208 /*nelts=*/NULL_TREE,
6209 /*static_storage_p=*/true);
6210 /* Remember that the initialization for this variable has
6212 DECL_INITIALIZED_P (decl) = 1;
6213 /* This declaration is the definition of this variable,
6214 unless we are initializing a static data member within
6215 the class specifier. */
6216 if (!DECL_EXTERNAL (decl))
6217 var_definition_p = true;
6219 /* If the variable has an array type, lay out the type, even if
6220 there is no initializer. It is valid to index through the
6221 array, and we must get TYPE_ALIGN set correctly on the array
6223 else if (TREE_CODE (type) == ARRAY_TYPE)
6226 if (TREE_STATIC (decl)
6227 && !at_function_scope_p ()
6228 && current_function_decl == NULL)
6229 /* So decl is a global variable or a static member of a
6230 non local class. Record the types it uses
6231 so that we can decide later to emit debug info for them. */
6232 record_types_used_by_current_var_decl (decl);
6234 else if (TREE_CODE (decl) == FIELD_DECL
6235 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6236 error ("non-static data member %qD has Java class type", decl);
6238 /* Add this declaration to the statement-tree. This needs to happen
6239 after the call to check_initializer so that the DECL_EXPR for a
6240 reference temp is added before the DECL_EXPR for the reference itself. */
6241 if (DECL_FUNCTION_SCOPE_P (decl))
6242 add_decl_expr (decl);
6244 /* Let the middle end know about variables and functions -- but not
6245 static data members in uninstantiated class templates. */
6246 if (TREE_CODE (decl) == VAR_DECL
6247 || TREE_CODE (decl) == FUNCTION_DECL)
6249 if (TREE_CODE (decl) == VAR_DECL)
6251 layout_var_decl (decl);
6252 maybe_commonize_var (decl);
6255 /* This needs to happen after the linkage is set. */
6256 determine_visibility (decl);
6258 if (var_definition_p && TREE_STATIC (decl))
6260 /* If a TREE_READONLY variable needs initialization
6261 at runtime, it is no longer readonly and we need to
6262 avoid MEM_READONLY_P being set on RTL created for it. */
6265 if (TREE_READONLY (decl))
6266 TREE_READONLY (decl) = 0;
6269 else if (was_readonly)
6270 TREE_READONLY (decl) = 1;
6273 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6275 /* Check for abstractness of the type. Notice that there is no
6276 need to strip array types here since the check for those types
6277 is already done within create_array_type_for_decl. */
6278 if (TREE_CODE (type) == FUNCTION_TYPE
6279 || TREE_CODE (type) == METHOD_TYPE)
6280 abstract_virtuals_error (decl, TREE_TYPE (type));
6282 abstract_virtuals_error (decl, type);
6284 if (TREE_TYPE (decl) == error_mark_node)
6285 /* No initialization required. */
6287 else if (TREE_CODE (decl) == FUNCTION_DECL)
6291 if (init == ridpointers[(int)RID_DEFAULT])
6293 /* An out-of-class default definition is defined at
6294 the point where it is explicitly defaulted. */
6295 if (DECL_DELETED_FN (decl))
6296 maybe_explain_implicit_delete (decl);
6297 else if (DECL_INITIAL (decl) == error_mark_node)
6298 synthesize_method (decl);
6301 error ("function %q#D is initialized like a variable", decl);
6303 /* else no initialization required. */
6305 else if (DECL_EXTERNAL (decl)
6306 && ! (DECL_LANG_SPECIFIC (decl)
6307 && DECL_NOT_REALLY_EXTERN (decl)))
6310 DECL_INITIAL (decl) = init;
6312 /* A variable definition. */
6313 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6314 /* Initialize the local variable. */
6315 initialize_local_var (decl, init);
6317 /* If a variable is defined, and then a subsequent
6318 definition with external linkage is encountered, we will
6319 get here twice for the same variable. We want to avoid
6320 calling expand_static_init more than once. For variables
6321 that are not static data members, we can call
6322 expand_static_init only when we actually process the
6323 initializer. It is not legal to redeclare a static data
6324 member, so this issue does not arise in that case. */
6325 else if (var_definition_p && TREE_STATIC (decl))
6326 expand_static_init (decl, init);
6329 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6330 reference, insert it in the statement-tree now. */
6332 push_cleanup (decl, cleanup, false);
6335 TREE_READONLY (decl) = 1;
6337 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6340 /* Returns a declaration for a VAR_DECL as if:
6342 extern "C" TYPE NAME;
6344 had been seen. Used to create compiler-generated global
6348 declare_global_var (tree name, tree type)
6352 push_to_top_level ();
6353 decl = build_decl (input_location, VAR_DECL, name, type);
6354 TREE_PUBLIC (decl) = 1;
6355 DECL_EXTERNAL (decl) = 1;
6356 DECL_ARTIFICIAL (decl) = 1;
6357 /* If the user has explicitly declared this variable (perhaps
6358 because the code we are compiling is part of a low-level runtime
6359 library), then it is possible that our declaration will be merged
6360 with theirs by pushdecl. */
6361 decl = pushdecl (decl);
6362 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6363 pop_from_top_level ();
6368 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6369 if "__cxa_atexit" is not being used) corresponding to the function
6370 to be called when the program exits. */
6373 get_atexit_fn_ptr_type (void)
6377 if (!atexit_fn_ptr_type_node)
6380 if (flag_use_cxa_atexit
6381 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6382 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6383 arg_type = ptr_type_node;
6385 /* The parameter to "atexit" is "void (*)(void)". */
6386 arg_type = NULL_TREE;
6388 fn_type = build_function_type_list (void_type_node,
6389 arg_type, NULL_TREE);
6390 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6393 return atexit_fn_ptr_type_node;
6396 /* Returns a pointer to the `atexit' function. Note that if
6397 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6398 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6401 get_atexit_node (void)
6407 bool use_aeabi_atexit;
6412 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6414 /* The declaration for `__cxa_atexit' is:
6416 int __cxa_atexit (void (*)(void *), void *, void *)
6418 We build up the argument types and then the function type
6420 tree argtype0, argtype1, argtype2;
6422 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6423 /* First, build the pointer-to-function type for the first
6425 fn_ptr_type = get_atexit_fn_ptr_type ();
6426 /* Then, build the rest of the argument types. */
6427 argtype2 = ptr_type_node;
6428 if (use_aeabi_atexit)
6430 argtype1 = fn_ptr_type;
6431 argtype0 = ptr_type_node;
6435 argtype1 = ptr_type_node;
6436 argtype0 = fn_ptr_type;
6438 /* And the final __cxa_atexit type. */
6439 fn_type = build_function_type_list (integer_type_node,
6440 argtype0, argtype1, argtype2,
6442 fn_ptr_type = build_pointer_type (fn_type);
6443 if (use_aeabi_atexit)
6444 name = "__aeabi_atexit";
6446 name = "__cxa_atexit";
6450 /* The declaration for `atexit' is:
6452 int atexit (void (*)());
6454 We build up the argument types and then the function type
6456 fn_ptr_type = get_atexit_fn_ptr_type ();
6457 /* Build the final atexit type. */
6458 fn_type = build_function_type_list (integer_type_node,
6459 fn_ptr_type, NULL_TREE);
6463 /* Now, build the function declaration. */
6464 push_lang_context (lang_name_c);
6465 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6466 mark_used (atexit_fndecl);
6467 pop_lang_context ();
6468 atexit_node = decay_conversion (atexit_fndecl);
6473 /* Returns the __dso_handle VAR_DECL. */
6476 get_dso_handle_node (void)
6478 if (dso_handle_node)
6479 return dso_handle_node;
6481 /* Declare the variable. */
6482 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6485 #ifdef HAVE_GAS_HIDDEN
6486 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6487 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6490 return dso_handle_node;
6493 /* Begin a new function with internal linkage whose job will be simply
6494 to destroy some particular variable. */
6496 static GTY(()) int start_cleanup_cnt;
6499 start_cleanup_fn (void)
6504 bool use_cxa_atexit = flag_use_cxa_atexit
6505 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6507 push_to_top_level ();
6509 /* No need to mangle this. */
6510 push_lang_context (lang_name_c);
6512 /* Build the name of the function. */
6513 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6514 /* Build the function declaration. */
6515 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6516 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6517 /* It's a function with internal linkage, generated by the
6519 TREE_PUBLIC (fndecl) = 0;
6520 DECL_ARTIFICIAL (fndecl) = 1;
6521 /* Make the function `inline' so that it is only emitted if it is
6522 actually needed. It is unlikely that it will be inlined, since
6523 it is only called via a function pointer, but we avoid unnecessary
6524 emissions this way. */
6525 DECL_DECLARED_INLINE_P (fndecl) = 1;
6526 DECL_INTERFACE_KNOWN (fndecl) = 1;
6527 /* Build the parameter. */
6532 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6533 DECL_CONTEXT (parmdecl) = fndecl;
6534 TREE_USED (parmdecl) = 1;
6535 DECL_READ_P (parmdecl) = 1;
6536 DECL_ARGUMENTS (fndecl) = parmdecl;
6540 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6542 pop_lang_context ();
6544 return current_function_decl;
6547 /* Finish the cleanup function begun by start_cleanup_fn. */
6550 end_cleanup_fn (void)
6552 expand_or_defer_fn (finish_function (0));
6554 pop_from_top_level ();
6557 /* Generate code to handle the destruction of DECL, an object with
6558 static storage duration. */
6561 register_dtor_fn (tree decl)
6568 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6570 type = TREE_TYPE (decl);
6571 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6572 return void_zero_node;
6574 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6575 a class object, we can just pass the destructor to
6576 "__cxa_atexit"; we don't have to build a temporary function to do
6578 use_dtor = (flag_use_cxa_atexit
6579 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6580 && CLASS_TYPE_P (type));
6585 /* Find the destructor. */
6586 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6587 gcc_assert (idx >= 0);
6588 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6589 /* Make sure it is accessible. */
6590 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6594 /* Call build_cleanup before we enter the anonymous function so
6595 that any access checks will be done relative to the current
6596 scope, rather than the scope of the anonymous function. */
6597 build_cleanup (decl);
6599 /* Now start the function. */
6600 cleanup = start_cleanup_fn ();
6602 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6603 to the original function, rather than the anonymous one. That
6604 will make the back end think that nested functions are in use,
6605 which causes confusion. */
6606 push_deferring_access_checks (dk_no_check);
6607 fcall = build_cleanup (decl);
6608 pop_deferring_access_checks ();
6610 /* Create the body of the anonymous function. */
6611 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6612 finish_expr_stmt (fcall);
6613 finish_compound_stmt (compound_stmt);
6617 /* Call atexit with the cleanup function. */
6618 mark_used (cleanup);
6619 cleanup = build_address (cleanup);
6620 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6626 /* We must convert CLEANUP to the type that "__cxa_atexit"
6628 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6629 /* "__cxa_atexit" will pass the address of DECL to the
6630 cleanup function. */
6632 addr = build_address (decl);
6633 /* The declared type of the parameter to "__cxa_atexit" is
6634 "void *". For plain "T*", we could just let the
6635 machinery in cp_build_function_call convert it -- but if the
6636 type is "cv-qualified T *", then we need to convert it
6637 before passing it in, to avoid spurious errors. */
6638 addr = build_nop (ptr_type_node, addr);
6641 /* Since the cleanup functions we build ignore the address
6642 they're given, there's no reason to pass the actual address
6643 in, and, in general, it's cheaper to pass NULL than any
6645 addr = null_pointer_node;
6646 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6647 tf_warning_or_error);
6648 if (targetm.cxx.use_aeabi_atexit ())
6661 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6662 arg0, arg1, arg2, NULL_TREE);
6665 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6666 is its initializer. Generate code to handle the construction
6667 and destruction of DECL. */
6670 expand_static_init (tree decl, tree init)
6672 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6673 gcc_assert (TREE_STATIC (decl));
6675 /* Some variables require no dynamic initialization. */
6677 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6680 if (DECL_FUNCTION_SCOPE_P (decl))
6682 /* Emit code to perform this initialization but once. */
6683 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6684 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6685 tree guard, guard_addr;
6688 /* Emit code to perform this initialization but once. This code
6691 static <type> guard;
6692 if (!guard.first_byte) {
6693 if (__cxa_guard_acquire (&guard)) {
6696 // Do initialization.
6697 flag = true; __cxa_guard_release (&guard);
6698 // Register variable for destruction at end of program.
6700 if (!flag) __cxa_guard_abort (&guard);
6704 Note that the `flag' variable is only set to 1 *after* the
6705 initialization is complete. This ensures that an exception,
6706 thrown during the construction, will cause the variable to
6707 reinitialized when we pass through this code again, as per:
6711 If the initialization exits by throwing an exception, the
6712 initialization is not complete, so it will be tried again
6713 the next time control enters the declaration.
6715 This process should be thread-safe, too; multiple threads
6716 should not be able to initialize the variable more than
6719 /* Create the guard variable. */
6720 guard = get_guard (decl);
6722 /* This optimization isn't safe on targets with relaxed memory
6723 consistency. On such targets we force synchronization in
6724 __cxa_guard_acquire. */
6725 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6727 /* Begin the conditional initialization. */
6728 if_stmt = begin_if_stmt ();
6729 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6730 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6733 if (flag_threadsafe_statics)
6735 tree vfntype = NULL_TREE;
6736 tree acquire_name, release_name, abort_name;
6737 tree acquire_fn, release_fn, abort_fn;
6738 guard_addr = build_address (guard);
6740 acquire_name = get_identifier ("__cxa_guard_acquire");
6741 release_name = get_identifier ("__cxa_guard_release");
6742 abort_name = get_identifier ("__cxa_guard_abort");
6743 acquire_fn = identifier_global_value (acquire_name);
6744 release_fn = identifier_global_value (release_name);
6745 abort_fn = identifier_global_value (abort_name);
6747 acquire_fn = push_library_fn
6748 (acquire_name, build_function_type_list (integer_type_node,
6749 TREE_TYPE (guard_addr),
6752 if (!release_fn || !abort_fn)
6753 vfntype = build_function_type_list (void_type_node,
6754 TREE_TYPE (guard_addr),
6757 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6759 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6761 inner_if_stmt = begin_if_stmt ();
6762 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6765 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6766 begin = get_target_expr (boolean_false_node);
6767 flag = TARGET_EXPR_SLOT (begin);
6769 TARGET_EXPR_CLEANUP (begin)
6770 = build3 (COND_EXPR, void_type_node, flag,
6772 build_call_n (abort_fn, 1, guard_addr));
6773 CLEANUP_EH_ONLY (begin) = 1;
6775 /* Do the initialization itself. */
6776 init = add_stmt_to_compound (begin, init);
6777 init = add_stmt_to_compound
6778 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6779 init = add_stmt_to_compound
6780 (init, build_call_n (release_fn, 1, guard_addr));
6783 init = add_stmt_to_compound (init, set_guard (guard));
6785 /* Use atexit to register a function for destroying this static
6787 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6789 finish_expr_stmt (init);
6791 if (flag_threadsafe_statics)
6793 finish_compound_stmt (inner_then_clause);
6794 finish_then_clause (inner_if_stmt);
6795 finish_if_stmt (inner_if_stmt);
6798 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6800 finish_compound_stmt (then_clause);
6801 finish_then_clause (if_stmt);
6802 finish_if_stmt (if_stmt);
6806 static_aggregates = tree_cons (init, decl, static_aggregates);
6810 /* Make TYPE a complete type based on INITIAL_VALUE.
6811 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6812 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6813 3 if the initializer list is empty (in pedantic mode). */
6816 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6819 tree type, elt_type;
6823 unsigned HOST_WIDE_INT i;
6826 /* An array of character type can be initialized from a
6827 brace-enclosed string constant.
6829 FIXME: this code is duplicated from reshape_init. Probably
6830 we should just call reshape_init here? */
6831 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6832 && TREE_CODE (initial_value) == CONSTRUCTOR
6833 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6835 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6836 tree value = VEC_index (constructor_elt, v, 0)->value;
6838 if (TREE_CODE (value) == STRING_CST
6839 && VEC_length (constructor_elt, v) == 1)
6840 initial_value = value;
6843 /* If any of the elements are parameter packs, we can't actually
6844 complete this type now because the array size is dependent. */
6845 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6847 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6850 if (PACK_EXPANSION_P (value))
6856 failure = complete_array_type (ptype, initial_value, do_default);
6858 /* We can create the array before the element type is complete, which
6859 means that we didn't have these two bits set in the original type
6860 either. In completing the type, we are expected to propagate these
6861 bits. See also complete_type which does the same thing for arrays
6864 if (TYPE_DOMAIN (type))
6866 elt_type = TREE_TYPE (type);
6867 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6868 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6869 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6875 /* As above, but either give an error or reject zero-size arrays, depending
6879 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6880 bool do_default, tsubst_flags_t complain)
6883 bool sfinae = !(complain & tf_error);
6884 /* In SFINAE context we can't be lenient about zero-size arrays. */
6887 failure = cp_complete_array_type (ptype, initial_value, do_default);
6893 /* Not an error. */;
6894 else if (failure == 1)
6895 error ("initializer fails to determine size of %qT", *ptype);
6896 else if (failure == 2)
6899 error ("array size missing in %qT", *ptype);
6901 else if (failure == 3)
6902 error ("zero-size array %qT", *ptype);
6903 *ptype = error_mark_node;
6908 /* Return zero if something is declared to be a member of type
6909 CTYPE when in the context of CUR_TYPE. STRING is the error
6910 message to print in that case. Otherwise, quietly return 1. */
6913 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6915 if (ctype && ctype != cur_type)
6917 if (flags == DTOR_FLAG)
6918 error ("destructor for alien class %qT cannot be a member", ctype);
6920 error ("constructor for alien class %qT cannot be a member", ctype);
6926 /* Subroutine of `grokdeclarator'. */
6928 /* Generate errors possibly applicable for a given set of specifiers.
6929 This is for ARM $7.1.2. */
6932 bad_specifiers (tree object,
6933 enum bad_spec_place type,
6944 error ("%qD declared as a %<virtual%> variable", object);
6946 error ("%qD declared as an %<inline%> variable", object);
6948 error ("%<const%> and %<volatile%> function specifiers on "
6949 "%qD invalid in variable declaration", object);
6953 error ("%qD declared as a %<virtual%> parameter", object);
6955 error ("%qD declared as an %<inline%> parameter", object);
6957 error ("%<const%> and %<volatile%> function specifiers on "
6958 "%qD invalid in parameter declaration", object);
6962 error ("%qD declared as a %<virtual%> type", object);
6964 error ("%qD declared as an %<inline%> type", object);
6966 error ("%<const%> and %<volatile%> function specifiers on "
6967 "%qD invalid in type declaration", object);
6971 error ("%qD declared as a %<virtual%> field", object);
6973 error ("%qD declared as an %<inline%> field", object);
6975 error ("%<const%> and %<volatile%> function specifiers on "
6976 "%qD invalid in field declaration", object);
6982 error ("%q+D declared as a friend", object);
6984 && (TREE_CODE (object) == TYPE_DECL
6985 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6986 && !TYPE_REFFN_P (TREE_TYPE (object))
6987 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6988 error ("%q+D declared with an exception specification", object);
6991 /* DECL is a member function or static data member and is presently
6992 being defined. Check that the definition is taking place in a
6996 check_class_member_definition_namespace (tree decl)
6998 /* These checks only apply to member functions and static data
7000 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7001 || TREE_CODE (decl) == VAR_DECL);
7002 /* We check for problems with specializations in pt.c in
7003 check_specialization_namespace, where we can issue better
7005 if (processing_specialization)
7007 /* There are no restrictions on the placement of
7008 explicit instantiations. */
7009 if (processing_explicit_instantiation)
7013 A member function definition that appears outside of the
7014 class definition shall appear in a namespace scope enclosing
7015 the class definition.
7019 The definition for a static data member shall appear in a
7020 namespace scope enclosing the member's class definition. */
7021 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7022 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7023 decl, DECL_CONTEXT (decl));
7026 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7027 METHOD_TYPE for a non-static member function; QUALS are the
7028 cv-qualifiers that apply to the function. */
7031 build_this_parm (tree type, cp_cv_quals quals)
7036 cp_cv_quals this_quals;
7038 if (CLASS_TYPE_P (type))
7041 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7042 this_type = build_pointer_type (this_type);
7045 this_type = type_of_this_parm (type);
7046 /* The `this' parameter is implicitly `const'; it cannot be
7048 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7049 qual_type = cp_build_qualified_type (this_type, this_quals);
7050 parm = build_artificial_parm (this_identifier, qual_type);
7051 cp_apply_type_quals_to_decl (this_quals, parm);
7055 /* DECL is a static member function. Complain if it was declared
7056 with function-cv-quals. */
7059 check_static_quals (tree decl, cp_cv_quals quals)
7061 if (quals != TYPE_UNQUALIFIED)
7062 error ("static member function %q#D declared with type qualifiers",
7066 /* CTYPE is class type, or null if non-class.
7067 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7069 DECLARATOR is the function's name.
7070 PARMS is a chain of PARM_DECLs for the function.
7071 VIRTUALP is truthvalue of whether the function is virtual or not.
7072 FLAGS are to be passed through to `grokclassfn'.
7073 QUALS are qualifiers indicating whether the function is `const'
7075 RAISES is a list of exceptions that this function can raise.
7076 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7077 not look, and -1 if we should not call `grokclassfn' at all.
7079 SFK is the kind of special function (if any) for the new function.
7081 Returns `NULL_TREE' if something goes wrong, after issuing
7082 applicable error messages. */
7085 grokfndecl (tree ctype,
7089 tree orig_declarator,
7091 enum overload_flags flags,
7098 special_function_kind sfk,
7103 location_t location)
7106 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7110 type = build_exception_variant (type, raises);
7112 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7114 /* If we have an explicit location, use it, otherwise use whatever
7115 build_lang_decl used (probably input_location). */
7116 if (location != UNKNOWN_LOCATION)
7117 DECL_SOURCE_LOCATION (decl) = location;
7119 if (TREE_CODE (type) == METHOD_TYPE)
7122 parm = build_this_parm (type, quals);
7123 DECL_CHAIN (parm) = parms;
7126 DECL_ARGUMENTS (decl) = parms;
7127 for (t = parms; t; t = DECL_CHAIN (t))
7128 DECL_CONTEXT (t) = decl;
7129 /* Propagate volatile out from type to decl. */
7130 if (TYPE_VOLATILE (type))
7131 TREE_THIS_VOLATILE (decl) = 1;
7133 /* Setup decl according to sfk. */
7136 case sfk_constructor:
7137 case sfk_copy_constructor:
7138 case sfk_move_constructor:
7139 DECL_CONSTRUCTOR_P (decl) = 1;
7141 case sfk_destructor:
7142 DECL_DESTRUCTOR_P (decl) = 1;
7148 /* If pointers to member functions use the least significant bit to
7149 indicate whether a function is virtual, ensure a pointer
7150 to this function will have that bit clear. */
7151 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7152 && TREE_CODE (type) == METHOD_TYPE
7153 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7154 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7157 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7161 ("defining explicit specialization %qD in friend declaration",
7165 tree fns = TREE_OPERAND (orig_declarator, 0);
7166 tree args = TREE_OPERAND (orig_declarator, 1);
7168 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7170 /* Something like `template <class T> friend void f<T>()'. */
7171 error ("invalid use of template-id %qD in declaration "
7172 "of primary template",
7178 /* A friend declaration of the form friend void f<>(). Record
7179 the information in the TEMPLATE_ID_EXPR. */
7180 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7182 if (TREE_CODE (fns) == COMPONENT_REF)
7184 /* Due to bison parser ickiness, we will have already looked
7185 up an operator_name or PFUNCNAME within the current class
7186 (see template_id in parse.y). If the current class contains
7187 such a name, we'll get a COMPONENT_REF here. Undo that. */
7189 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7190 == current_class_type);
7191 fns = TREE_OPERAND (fns, 1);
7193 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7194 || TREE_CODE (fns) == OVERLOAD);
7195 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7197 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7198 if (TREE_PURPOSE (t)
7199 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7201 error ("default arguments are not allowed in declaration "
7202 "of friend template specialization %qD",
7209 error ("%<inline%> is not allowed in declaration of friend "
7210 "template specialization %qD",
7217 /* If this decl has namespace scope, set that up. */
7219 set_decl_namespace (decl, in_namespace, friendp);
7221 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7223 /* `main' and builtins have implicit 'C' linkage. */
7224 if ((MAIN_NAME_P (declarator)
7225 || (IDENTIFIER_LENGTH (declarator) > 10
7226 && IDENTIFIER_POINTER (declarator)[0] == '_'
7227 && IDENTIFIER_POINTER (declarator)[1] == '_'
7228 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7229 && current_lang_name == lang_name_cplusplus
7230 && ctype == NULL_TREE
7231 && DECL_FILE_SCOPE_P (decl))
7232 SET_DECL_LANGUAGE (decl, lang_c);
7234 /* Should probably propagate const out from type to decl I bet (mrs). */
7237 DECL_STATIC_FUNCTION_P (decl) = 1;
7238 DECL_CONTEXT (decl) = ctype;
7243 DECL_CONTEXT (decl) = ctype;
7245 check_class_member_definition_namespace (decl);
7248 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7250 if (processing_template_decl)
7251 error ("cannot declare %<::main%> to be a template");
7253 error ("cannot declare %<::main%> to be inline");
7255 error ("cannot declare %<::main%> to be static");
7260 /* Members of anonymous types and local classes have no linkage; make
7261 them internal. If a typedef is made later, this will be changed. */
7262 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7263 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7266 if (publicp && cxx_dialect == cxx98)
7268 /* [basic.link]: A name with no linkage (notably, the name of a class
7269 or enumeration declared in a local scope) shall not be used to
7270 declare an entity with linkage.
7272 DR 757 relaxes this restriction for C++0x. */
7273 t = no_linkage_check (TREE_TYPE (decl),
7274 /*relaxed_p=*/false);
7277 if (TYPE_ANONYMOUS_P (t))
7279 if (DECL_EXTERN_C_P (decl))
7280 /* Allow this; it's pretty common in C. */;
7283 permerror (input_location, "anonymous type with no linkage "
7284 "used to declare function %q#D with linkage",
7286 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7287 permerror (input_location, "%q+#D does not refer to the unqualified "
7288 "type, so it is not used for linkage",
7293 permerror (input_location, "type %qT with no linkage used to "
7294 "declare function %q#D with linkage", t, decl);
7298 TREE_PUBLIC (decl) = publicp;
7301 DECL_INTERFACE_KNOWN (decl) = 1;
7302 DECL_NOT_REALLY_EXTERN (decl) = 1;
7305 /* If the declaration was declared inline, mark it as such. */
7307 DECL_DECLARED_INLINE_P (decl) = 1;
7309 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7311 DECL_EXTERNAL (decl) = 1;
7312 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7315 ? G_("static member function %qD cannot have cv-qualifier")
7316 : G_("non-member function %qD cannot have cv-qualifier"),
7318 quals = TYPE_UNQUALIFIED;
7321 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7322 && !grok_op_properties (decl, /*complain=*/true))
7326 /* Make the init_value nonzero so pushdecl knows this is not
7327 tentative. error_mark_node is replaced later with the BLOCK. */
7328 DECL_INITIAL (decl) = error_mark_node;
7330 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7331 TREE_NOTHROW (decl) = 1;
7333 /* Caller will do the rest of this. */
7337 if (ctype != NULL_TREE)
7338 grokclassfn (ctype, decl, flags);
7340 decl = check_explicit_specialization (orig_declarator, decl,
7343 4 * (friendp != 0));
7344 if (decl == error_mark_node)
7347 if (DECL_STATIC_FUNCTION_P (decl))
7348 check_static_quals (decl, quals);
7352 cplus_decl_attributes (&decl, *attrlist, 0);
7353 *attrlist = NULL_TREE;
7356 /* Check main's type after attributes have been applied. */
7357 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7359 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7362 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7364 error ("%<::main%> must return %<int%>");
7365 newtype = build_function_type (integer_type_node, oldtypeargs);
7366 TREE_TYPE (decl) = newtype;
7369 check_main_parameter_types (decl);
7372 if (ctype != NULL_TREE
7373 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7376 tree old_decl = check_classfn (ctype, decl,
7377 (processing_template_decl
7378 > template_class_depth (ctype))
7379 ? current_template_parms
7382 if (old_decl == error_mark_node)
7390 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7391 /* Because grokfndecl is always supposed to return a
7392 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7393 here. We depend on our callers to figure out that its
7394 really a template that's being returned. */
7395 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7397 if (DECL_STATIC_FUNCTION_P (old_decl)
7398 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7400 /* Remove the `this' parm added by grokclassfn. */
7401 revert_static_member_fn (decl);
7402 check_static_quals (decl, quals);
7404 if (DECL_ARTIFICIAL (old_decl))
7406 error ("definition of implicitly-declared %qD", old_decl);
7410 /* Since we've smashed OLD_DECL to its
7411 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7412 if (TREE_CODE (decl) == TEMPLATE_DECL)
7413 decl = DECL_TEMPLATE_RESULT (decl);
7415 /* Attempt to merge the declarations. This can fail, in
7416 the case of some invalid specialization declarations. */
7417 pushed_scope = push_scope (ctype);
7418 ok = duplicate_decls (decl, old_decl, friendp);
7420 pop_scope (pushed_scope);
7423 error ("no %q#D member function declared in class %qT",
7431 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7434 if (ctype == NULL_TREE || check)
7438 DECL_VIRTUAL_P (decl) = 1;
7443 /* decl is a FUNCTION_DECL.
7444 specifiers are the parsed virt-specifiers.
7446 Set flags to reflect the virt-specifiers.
7451 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7453 if (decl == NULL_TREE)
7455 if (specifiers & VIRT_SPEC_OVERRIDE)
7456 DECL_OVERRIDE_P (decl) = 1;
7457 if (specifiers & VIRT_SPEC_FINAL)
7458 DECL_FINAL_P (decl) = 1;
7462 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7463 the linkage that DECL will receive in the object file. */
7466 set_linkage_for_static_data_member (tree decl)
7468 /* A static data member always has static storage duration and
7469 external linkage. Note that static data members are forbidden in
7470 local classes -- the only situation in which a class has
7471 non-external linkage. */
7472 TREE_PUBLIC (decl) = 1;
7473 TREE_STATIC (decl) = 1;
7474 /* For non-template classes, static data members are always put
7475 out in exactly those files where they are defined, just as
7476 with ordinary namespace-scope variables. */
7477 if (!processing_template_decl)
7478 DECL_INTERFACE_KNOWN (decl) = 1;
7481 /* Create a VAR_DECL named NAME with the indicated TYPE.
7483 If SCOPE is non-NULL, it is the class type or namespace containing
7484 the variable. If SCOPE is NULL, the variable should is created in
7485 the innermost enclosings scope. */
7488 grokvardecl (tree type,
7490 const cp_decl_specifier_seq *declspecs,
7496 tree explicit_scope;
7498 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7500 /* Compute the scope in which to place the variable, but remember
7501 whether or not that scope was explicitly specified by the user. */
7502 explicit_scope = scope;
7505 /* An explicit "extern" specifier indicates a namespace-scope
7507 if (declspecs->storage_class == sc_extern)
7508 scope = current_decl_namespace ();
7509 else if (!at_function_scope_p ())
7510 scope = current_scope ();
7514 && (/* If the variable is a namespace-scope variable declared in a
7515 template, we need DECL_LANG_SPECIFIC. */
7516 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7517 /* Similarly for namespace-scope variables with language linkage
7519 || (TREE_CODE (scope) == NAMESPACE_DECL
7520 && current_lang_name != lang_name_cplusplus)
7521 /* Similarly for static data members. */
7523 decl = build_lang_decl (VAR_DECL, name, type);
7525 decl = build_decl (input_location, VAR_DECL, name, type);
7527 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7528 set_decl_namespace (decl, explicit_scope, 0);
7530 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7532 if (declspecs->storage_class == sc_extern)
7534 DECL_THIS_EXTERN (decl) = 1;
7535 DECL_EXTERNAL (decl) = !initialized;
7538 if (DECL_CLASS_SCOPE_P (decl))
7540 set_linkage_for_static_data_member (decl);
7541 /* This function is only called with out-of-class definitions. */
7542 DECL_EXTERNAL (decl) = 0;
7543 check_class_member_definition_namespace (decl);
7545 /* At top level, either `static' or no s.c. makes a definition
7546 (perhaps tentative), and absence of `static' makes it public. */
7547 else if (toplevel_bindings_p ())
7549 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7550 && (DECL_THIS_EXTERN (decl) || ! constp));
7551 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7553 /* Not at top level, only `static' makes a static definition. */
7556 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7557 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7560 if (declspecs->specs[(int)ds_thread])
7561 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7563 /* If the type of the decl has no linkage, make sure that we'll
7564 notice that in mark_used. */
7565 if (cxx_dialect > cxx98
7566 && decl_linkage (decl) != lk_none
7567 && DECL_LANG_SPECIFIC (decl) == NULL
7568 && !DECL_EXTERN_C_P (decl)
7569 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7570 retrofit_lang_decl (decl);
7572 if (TREE_PUBLIC (decl))
7574 /* [basic.link]: A name with no linkage (notably, the name of a class
7575 or enumeration declared in a local scope) shall not be used to
7576 declare an entity with linkage.
7578 DR 757 relaxes this restriction for C++0x. */
7579 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7580 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7583 if (TYPE_ANONYMOUS_P (t))
7585 if (DECL_EXTERN_C_P (decl))
7586 /* Allow this; it's pretty common in C. */
7590 /* DRs 132, 319 and 389 seem to indicate types with
7591 no linkage can only be used to declare extern "C"
7592 entities. Since it's not always an error in the
7593 ISO C++ 90 Standard, we only issue a warning. */
7594 warning (0, "anonymous type with no linkage used to declare "
7595 "variable %q#D with linkage", decl);
7596 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7597 warning (0, "%q+#D does not refer to the unqualified "
7598 "type, so it is not used for linkage",
7603 warning (0, "type %qT with no linkage used to declare variable "
7604 "%q#D with linkage", t, decl);
7608 DECL_INTERFACE_KNOWN (decl) = 1;
7613 /* Create and return a canonical pointer to member function type, for
7614 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7617 build_ptrmemfunc_type (tree type)
7621 tree unqualified_variant = NULL_TREE;
7623 if (type == error_mark_node)
7626 /* If a canonical type already exists for this type, use it. We use
7627 this method instead of type_hash_canon, because it only does a
7628 simple equality check on the list of field members. */
7630 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7633 /* Make sure that we always have the unqualified pointer-to-member
7635 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7637 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7639 t = make_class_type (RECORD_TYPE);
7640 xref_basetypes (t, NULL_TREE);
7642 /* Let the front end know this is a pointer to member function... */
7643 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7644 /* ... and not really a class type. */
7645 SET_CLASS_TYPE_P (t, 0);
7647 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7650 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7652 DECL_CHAIN (field) = fields;
7655 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7657 /* Zap out the name so that the back end will give us the debugging
7658 information for this anonymous RECORD_TYPE. */
7659 TYPE_NAME (t) = NULL_TREE;
7661 /* If this is not the unqualified form of this pointer-to-member
7662 type, set the TYPE_MAIN_VARIANT for this type to be the
7663 unqualified type. Since they are actually RECORD_TYPEs that are
7664 not variants of each other, we must do this manually.
7665 As we just built a new type there is no need to do yet another copy. */
7666 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7668 int type_quals = cp_type_quals (type);
7669 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7670 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7671 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7672 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7673 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7674 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7675 TREE_TYPE (TYPE_BINFO (t)) = t;
7678 /* Cache this pointer-to-member type so that we can find it again
7680 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7682 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7683 SET_TYPE_STRUCTURAL_EQUALITY (t);
7684 else if (TYPE_CANONICAL (type) != type)
7685 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7690 /* Create and return a pointer to data member type. */
7693 build_ptrmem_type (tree class_type, tree member_type)
7695 if (TREE_CODE (member_type) == METHOD_TYPE)
7697 cp_cv_quals quals = type_memfn_quals (member_type);
7698 member_type = build_memfn_type (member_type, class_type, quals);
7699 return build_ptrmemfunc_type (build_pointer_type (member_type));
7703 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7704 return build_offset_type (class_type, member_type);
7708 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7709 Check to see that the definition is valid. Issue appropriate error
7710 messages. Return 1 if the definition is particularly bad, or 0
7714 check_static_variable_definition (tree decl, tree type)
7716 /* Can't check yet if we don't know the type. */
7717 if (dependent_type_p (type))
7719 /* If DECL is declared constexpr, we'll do the appropriate checks
7720 in check_initializer. */
7721 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7723 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7725 if (literal_type_p (type))
7726 permerror (input_location,
7727 "%<constexpr%> needed for in-class initialization of "
7728 "static data member %q#D of non-integral type", decl);
7730 error ("in-class initialization of static data member %q#D of "
7731 "non-literal type", decl);
7735 /* Motion 10 at San Diego: If a static const integral data member is
7736 initialized with an integral constant expression, the initializer
7737 may appear either in the declaration (within the class), or in
7738 the definition, but not both. If it appears in the class, the
7739 member is a member constant. The file-scope definition is always
7741 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7743 error ("invalid in-class initialization of static data member "
7744 "of non-integral type %qT",
7748 else if (!CP_TYPE_CONST_P (type))
7749 error ("ISO C++ forbids in-class initialization of non-const "
7750 "static member %qD",
7752 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7753 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7754 "%qD of non-integral type %qT", decl, type);
7759 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7760 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7761 expressions out into temporary variables so that walk_tree doesn't
7762 step into them (c++/15764). */
7765 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7767 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7768 tree expr = *expr_p;
7769 if (TREE_CODE (expr) == SAVE_EXPR)
7771 tree op = TREE_OPERAND (expr, 0);
7772 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7773 if (TREE_SIDE_EFFECTS (op))
7774 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7777 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7782 /* Entry point for the above. */
7785 stabilize_vla_size (tree size)
7787 struct pointer_set_t *pset = pointer_set_create ();
7788 /* Break out any function calls into temporary variables. */
7789 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7792 /* Given the SIZE (i.e., number of elements) in an array, compute an
7793 appropriate index type for the array. If non-NULL, NAME is the
7794 name of the thing being declared. */
7797 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7802 tree abi_1_itype = NULL_TREE;
7804 if (error_operand_p (size))
7805 return error_mark_node;
7807 type = TREE_TYPE (size);
7808 /* type_dependent_expression_p? */
7809 if (!dependent_type_p (type))
7811 mark_rvalue_use (size);
7813 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7814 && TREE_SIDE_EFFECTS (size))
7815 /* In C++98, we mark a non-constant array bound with a magic
7816 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7819 size = fold_non_dependent_expr (size);
7821 if (CLASS_TYPE_P (type)
7822 && CLASSTYPE_LITERAL_P (type))
7824 size = build_expr_type_conversion (WANT_INT, size, true);
7827 if (!(complain & tf_error))
7828 return error_mark_node;
7830 error ("size of array %qD has non-integral type %qT",
7833 error ("size of array has non-integral type %qT", type);
7834 size = integer_one_node;
7836 if (size == error_mark_node)
7837 return error_mark_node;
7838 type = TREE_TYPE (size);
7839 /* We didn't support this case in GCC 3.2, so don't bother
7840 trying to model it now in ABI v1. */
7841 abi_1_itype = error_mark_node;
7844 size = maybe_constant_value (size);
7845 if (!TREE_CONSTANT (size))
7849 if (error_operand_p (size))
7850 return error_mark_node;
7852 /* The array bound must be an integer type. */
7853 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7855 if (!(complain & tf_error))
7856 return error_mark_node;
7858 error ("size of array %qD has non-integral type %qT", name, type);
7860 error ("size of array has non-integral type %qT", type);
7861 size = integer_one_node;
7862 type = TREE_TYPE (size);
7866 /* A type is dependent if it is...an array type constructed from any
7867 dependent type or whose size is specified by a constant expression
7868 that is value-dependent. */
7869 /* We can only call value_dependent_expression_p on integral constant
7870 expressions; treat non-constant expressions as dependent, too. */
7871 if (processing_template_decl
7872 && (dependent_type_p (type)
7873 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7875 /* We cannot do any checking for a SIZE that isn't known to be
7876 constant. Just build the index type and mark that it requires
7877 structural equality checks. */
7878 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7879 size, integer_one_node));
7880 TYPE_DEPENDENT_P (itype) = 1;
7881 TYPE_DEPENDENT_P_VALID (itype) = 1;
7882 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7886 if (!abi_version_at_least (2) && processing_template_decl
7887 && abi_1_itype == NULL_TREE)
7888 /* For abi-1, we handled all instances in templates the same way,
7889 even when they were non-dependent. This affects the manglings
7890 produced. So, we do the normal checking for non-dependent
7891 sizes, but at the end we'll return the same type that abi-1
7892 would have, but with TYPE_CANONICAL set to the "right"
7893 value that the current ABI would provide. */
7894 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7895 osize, integer_one_node));
7897 /* Normally, the array-bound will be a constant. */
7898 if (TREE_CODE (size) == INTEGER_CST)
7900 /* Check to see if the array bound overflowed. Make that an
7901 error, no matter how generous we're being. */
7902 constant_expression_error (size);
7904 /* An array must have a positive number of elements. */
7905 if (INT_CST_LT (size, integer_zero_node))
7907 if (!(complain & tf_error))
7908 return error_mark_node;
7910 error ("size of array %qD is negative", name);
7912 error ("size of array is negative");
7913 size = integer_one_node;
7915 /* As an extension we allow zero-sized arrays. */
7916 else if (integer_zerop (size))
7918 if (!(complain & tf_error))
7919 /* We must fail if performing argument deduction (as
7920 indicated by the state of complain), so that
7921 another substitution can be found. */
7922 return error_mark_node;
7923 else if (in_system_header)
7924 /* Allow them in system headers because glibc uses them. */;
7926 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7928 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7931 else if (TREE_CONSTANT (size)
7932 /* We don't allow VLAs at non-function scopes, or during
7933 tentative template substitution. */
7934 || !at_function_scope_p () || !(complain & tf_error))
7936 if (!(complain & tf_error))
7937 return error_mark_node;
7938 /* `(int) &fn' is not a valid array bound. */
7940 error ("size of array %qD is not an integral constant-expression",
7943 error ("size of array is not an integral constant-expression");
7944 size = integer_one_node;
7946 else if (pedantic && warn_vla != 0)
7949 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7951 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7953 else if (warn_vla > 0)
7957 "variable length array %qD is used", name);
7960 "variable length array is used");
7963 if (processing_template_decl && !TREE_CONSTANT (size))
7964 /* A variable sized array. */
7965 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7968 HOST_WIDE_INT saved_processing_template_decl;
7970 /* Compute the index of the largest element in the array. It is
7971 one less than the number of elements in the array. We save
7972 and restore PROCESSING_TEMPLATE_DECL so that computations in
7973 cp_build_binary_op will be appropriately folded. */
7974 saved_processing_template_decl = processing_template_decl;
7975 processing_template_decl = 0;
7976 itype = cp_build_binary_op (input_location,
7978 cp_convert (ssizetype, size),
7979 cp_convert (ssizetype, integer_one_node),
7980 tf_warning_or_error);
7981 itype = fold (itype);
7982 processing_template_decl = saved_processing_template_decl;
7984 if (!TREE_CONSTANT (itype))
7985 /* A variable sized array. */
7986 itype = variable_size (itype);
7987 /* Make sure that there was no overflow when creating to a signed
7988 index type. (For example, on a 32-bit machine, an array with
7989 size 2^32 - 1 is too big.) */
7990 else if (TREE_CODE (itype) == INTEGER_CST
7991 && TREE_OVERFLOW (itype))
7993 if (!(complain & tf_error))
7994 return error_mark_node;
7995 error ("overflow in array dimension");
7996 TREE_OVERFLOW (itype) = 0;
8000 /* Create and return the appropriate index type. */
8001 if (abi_1_itype && abi_1_itype != error_mark_node)
8003 tree t = build_index_type (itype);
8004 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8005 itype = abi_1_itype;
8008 itype = build_index_type (itype);
8010 /* If the index type were dependent, we would have returned early, so
8011 remember that it isn't. */
8012 TYPE_DEPENDENT_P (itype) = 0;
8013 TYPE_DEPENDENT_P_VALID (itype) = 1;
8017 /* Returns the scope (if any) in which the entity declared by
8018 DECLARATOR will be located. If the entity was declared with an
8019 unqualified name, NULL_TREE is returned. */
8022 get_scope_of_declarator (const cp_declarator *declarator)
8024 while (declarator && declarator->kind != cdk_id)
8025 declarator = declarator->declarator;
8027 /* If the declarator-id is a SCOPE_REF, the scope in which the
8028 declaration occurs is the first operand. */
8030 && declarator->u.id.qualifying_scope)
8031 return declarator->u.id.qualifying_scope;
8033 /* Otherwise, the declarator is not a qualified name; the entity will
8034 be declared in the current scope. */
8038 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8039 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8043 create_array_type_for_decl (tree name, tree type, tree size)
8045 tree itype = NULL_TREE;
8047 /* If things have already gone awry, bail now. */
8048 if (type == error_mark_node || size == error_mark_node)
8049 return error_mark_node;
8051 /* 8.3.4/1: If the type of the identifier of D contains the auto
8052 type-specifier, the program is ill-formed. */
8053 if (pedantic && type_uses_auto (type))
8054 pedwarn (input_location, OPT_pedantic,
8055 "declaration of %qD as array of %<auto%>", name);
8057 /* If there are some types which cannot be array elements,
8058 issue an error-message and return. */
8059 switch (TREE_CODE (type))
8063 error ("declaration of %qD as array of void", name);
8065 error ("creating array of void");
8066 return error_mark_node;
8070 error ("declaration of %qD as array of functions", name);
8072 error ("creating array of functions");
8073 return error_mark_node;
8075 case REFERENCE_TYPE:
8077 error ("declaration of %qD as array of references", name);
8079 error ("creating array of references");
8080 return error_mark_node;
8084 error ("declaration of %qD as array of function members", name);
8086 error ("creating array of function members");
8087 return error_mark_node;
8095 The constant expressions that specify the bounds of the arrays
8096 can be omitted only for the first member of the sequence. */
8097 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8100 error ("declaration of %qD as multidimensional array must "
8101 "have bounds for all dimensions except the first",
8104 error ("multidimensional array must have bounds for all "
8105 "dimensions except the first");
8107 return error_mark_node;
8110 /* Figure out the index type for the array. */
8112 itype = compute_array_index_type (name, size, tf_warning_or_error);
8115 T is called the array element type; this type shall not be [...] an
8116 abstract class type. */
8117 abstract_virtuals_error (name, type);
8119 return build_cplus_array_type (type, itype);
8122 /* Check that it's OK to declare a function with the indicated TYPE.
8123 SFK indicates the kind of special function (if any) that this
8124 function is. OPTYPE is the type given in a conversion operator
8125 declaration, or the class type for a constructor/destructor.
8126 Returns the actual return type of the function; that
8127 may be different than TYPE if an error occurs, or for certain
8128 special functions. */
8131 check_special_function_return_type (special_function_kind sfk,
8137 case sfk_constructor:
8139 error ("return type specification for constructor invalid");
8141 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8142 type = build_pointer_type (optype);
8144 type = void_type_node;
8147 case sfk_destructor:
8149 error ("return type specification for destructor invalid");
8150 /* We can't use the proper return type here because we run into
8151 problems with ambiguous bases and covariant returns.
8152 Java classes are left unchanged because (void *) isn't a valid
8153 Java type, and we don't want to change the Java ABI. */
8154 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8155 type = build_pointer_type (void_type_node);
8157 type = void_type_node;
8160 case sfk_conversion:
8162 error ("return type specified for %<operator %T%>", optype);
8173 /* A variable or data member (whose unqualified name is IDENTIFIER)
8174 has been declared with the indicated TYPE. If the TYPE is not
8175 acceptable, issue an error message and return a type to use for
8176 error-recovery purposes. */
8179 check_var_type (tree identifier, tree type)
8181 if (VOID_TYPE_P (type))
8184 error ("unnamed variable or field declared void");
8185 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8187 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8188 error ("variable or field %qE declared void", identifier);
8191 error ("variable or field declared void");
8192 type = error_mark_node;
8198 /* Given declspecs and a declarator (abstract or otherwise), determine
8199 the name and type of the object declared and construct a DECL node
8202 DECLSPECS points to the representation of declaration-specifier
8203 sequence that precedes declarator.
8205 DECL_CONTEXT says which syntactic context this declaration is in:
8206 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8207 FUNCDEF for a function definition. Like NORMAL but a few different
8208 error messages in each case. Return value may be zero meaning
8209 this definition is too screwy to try to parse.
8210 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8211 handle member functions (which have FIELD context).
8212 Return value may be zero meaning this definition is too screwy to
8214 PARM for a parameter declaration (either within a function prototype
8215 or before a function body). Make a PARM_DECL, or return void_type_node.
8216 TPARM for a template parameter declaration.
8217 CATCHPARM for a parameter declaration before a catch clause.
8218 TYPENAME if for a typename (in a cast or sizeof).
8219 Don't make a DECL node; just return the ..._TYPE node.
8220 FIELD for a struct or union field; make a FIELD_DECL.
8221 BITFIELD for a field with specified width.
8223 INITIALIZED is as for start_decl.
8225 ATTRLIST is a pointer to the list of attributes, which may be NULL
8226 if there are none; *ATTRLIST may be modified if attributes from inside
8227 the declarator should be applied to the declaration.
8229 When this function is called, scoping variables (such as
8230 CURRENT_CLASS_TYPE) should reflect the scope in which the
8231 declaration occurs, not the scope in which the new declaration will
8232 be placed. For example, on:
8236 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8239 Returns a DECL (if a declarator is present), a TYPE (if there is no
8240 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8244 grokdeclarator (const cp_declarator *declarator,
8245 const cp_decl_specifier_seq *declspecs,
8246 enum decl_context decl_context,
8250 tree type = NULL_TREE;
8252 int explicit_int128 = 0;
8253 int virtualp, explicitp, friendp, inlinep, staticp;
8254 int explicit_int = 0;
8255 int explicit_char = 0;
8256 int defaulted_int = 0;
8257 tree dependent_name = NULL_TREE;
8259 tree typedef_decl = NULL_TREE;
8260 const char *name = NULL;
8261 tree typedef_type = NULL_TREE;
8262 /* True if this declarator is a function definition. */
8263 bool funcdef_flag = false;
8264 cp_declarator_kind innermost_code = cdk_error;
8267 /* See the code below that used this. */
8268 tree decl_attr = NULL_TREE;
8271 /* Keep track of what sort of function is being processed
8272 so that we can warn about default return values, or explicit
8273 return values which do not match prescribed defaults. */
8274 special_function_kind sfk = sfk_none;
8276 tree dname = NULL_TREE;
8277 tree ctor_return_type = NULL_TREE;
8278 enum overload_flags flags = NO_SPECIAL;
8279 /* cv-qualifiers that apply to the declarator, for a declaration of
8280 a member function. */
8281 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8282 /* virt-specifiers that apply to the declarator, for a declaration of
8283 a member function. */
8284 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8285 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8287 tree raises = NULL_TREE;
8288 int template_count = 0;
8289 tree returned_attrs = NULL_TREE;
8290 tree parms = NULL_TREE;
8291 const cp_declarator *id_declarator;
8292 /* The unqualified name of the declarator; either an
8293 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8294 tree unqualified_id;
8295 /* The class type, if any, in which this entity is located,
8296 or NULL_TREE if none. Note that this value may be different from
8297 the current class type; for example if an attempt is made to declare
8298 "A::f" inside "B", this value will be "A". */
8299 tree ctype = current_class_type;
8300 /* The NAMESPACE_DECL for the namespace in which this entity is
8301 located. If an unqualified name is used to declare the entity,
8302 this value will be NULL_TREE, even if the entity is located at
8304 tree in_namespace = NULL_TREE;
8305 cp_storage_class storage_class;
8306 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8307 bool type_was_error_mark_node = false;
8308 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8309 bool template_type_arg = false;
8310 bool template_parm_flag = false;
8311 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8314 signed_p = declspecs->specs[(int)ds_signed];
8315 unsigned_p = declspecs->specs[(int)ds_unsigned];
8316 short_p = declspecs->specs[(int)ds_short];
8317 long_p = declspecs->specs[(int)ds_long];
8318 longlong = declspecs->specs[(int)ds_long] >= 2;
8319 explicit_int128 = declspecs->explicit_int128_p;
8320 thread_p = declspecs->specs[(int)ds_thread];
8322 if (decl_context == FUNCDEF)
8323 funcdef_flag = true, decl_context = NORMAL;
8324 else if (decl_context == MEMFUNCDEF)
8325 funcdef_flag = true, decl_context = FIELD;
8326 else if (decl_context == BITFIELD)
8327 bitfield = 1, decl_context = FIELD;
8328 else if (decl_context == TEMPLATE_TYPE_ARG)
8329 template_type_arg = true, decl_context = TYPENAME;
8330 else if (decl_context == TPARM)
8331 template_parm_flag = true, decl_context = PARM;
8333 if (initialized > 1)
8334 funcdef_flag = true;
8336 /* Look inside a declarator for the name being declared
8337 and get it as a string, for an error message. */
8338 for (id_declarator = declarator;
8340 id_declarator = id_declarator->declarator)
8342 if (id_declarator->kind != cdk_id)
8343 innermost_code = id_declarator->kind;
8345 switch (id_declarator->kind)
8348 if (id_declarator->declarator
8349 && id_declarator->declarator->kind == cdk_id)
8351 sfk = id_declarator->declarator->u.id.sfk;
8352 if (sfk == sfk_destructor)
8359 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8360 tree decl = id_declarator->u.id.unqualified_name;
8363 if (qualifying_scope)
8365 if (at_function_scope_p ())
8369 A declarator-id shall not be qualified except
8372 None of the cases are permitted in block
8374 if (qualifying_scope == global_namespace)
8375 error ("invalid use of qualified-name %<::%D%>",
8377 else if (TYPE_P (qualifying_scope))
8378 error ("invalid use of qualified-name %<%T::%D%>",
8379 qualifying_scope, decl);
8381 error ("invalid use of qualified-name %<%D::%D%>",
8382 qualifying_scope, decl);
8383 return error_mark_node;
8385 else if (TYPE_P (qualifying_scope))
8387 ctype = qualifying_scope;
8388 if (!MAYBE_CLASS_TYPE_P (ctype))
8390 error ("%q#T is not a class or a namespace", ctype);
8393 else if (innermost_code != cdk_function
8394 && current_class_type
8395 && !UNIQUELY_DERIVED_FROM_P (ctype,
8396 current_class_type))
8398 error ("type %qT is not derived from type %qT",
8399 ctype, current_class_type);
8400 return error_mark_node;
8403 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8404 in_namespace = qualifying_scope;
8406 switch (TREE_CODE (decl))
8412 if (innermost_code != cdk_function)
8414 error ("declaration of %qD as non-function", decl);
8415 return error_mark_node;
8417 else if (!qualifying_scope
8418 && !(current_class_type && at_class_scope_p ()))
8420 error ("declaration of %qD as non-member", decl);
8421 return error_mark_node;
8424 type = TREE_OPERAND (decl, 0);
8426 type = constructor_name (type);
8427 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8432 case TEMPLATE_ID_EXPR:
8434 tree fns = TREE_OPERAND (decl, 0);
8437 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8439 gcc_assert (is_overloaded_fn (dname));
8440 dname = DECL_NAME (get_first_fn (dname));
8445 case IDENTIFIER_NODE:
8446 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8449 if (C_IS_RESERVED_WORD (dname))
8451 error ("declarator-id missing; using reserved word %qD",
8453 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8455 else if (!IDENTIFIER_TYPENAME_P (dname))
8456 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8459 gcc_assert (flags == NO_SPECIAL);
8460 flags = TYPENAME_FLAG;
8461 ctor_return_type = TREE_TYPE (dname);
8462 sfk = sfk_conversion;
8463 if (is_typename_at_global_scope (dname))
8464 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8466 name = "<invalid operator>";
8483 return error_mark_node;
8488 if (id_declarator->kind == cdk_id)
8494 The declarator in a function-definition shall have the form
8495 D1 ( parameter-declaration-clause) ... */
8496 if (funcdef_flag && innermost_code != cdk_function)
8498 error ("function definition does not declare parameters");
8499 return error_mark_node;
8502 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8503 && innermost_code != cdk_function
8504 && ! (ctype && !declspecs->any_specifiers_p))
8506 error ("declaration of %qD as non-function", dname);
8507 return error_mark_node;
8510 if (dname && IDENTIFIER_OPNAME_P (dname))
8512 if (declspecs->specs[(int)ds_typedef])
8514 error ("declaration of %qD as %<typedef%>", dname);
8515 return error_mark_node;
8517 else if (decl_context == PARM || decl_context == CATCHPARM)
8519 error ("declaration of %qD as parameter", dname);
8520 return error_mark_node;
8524 /* Anything declared one level down from the top level
8525 must be one of the parameters of a function
8526 (because the body is at least two levels down). */
8528 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8529 by not allowing C++ class definitions to specify their parameters
8530 with xdecls (must be spec.d in the parmlist).
8532 Since we now wait to push a class scope until we are sure that
8533 we are in a legitimate method context, we must set oldcname
8534 explicitly (since current_class_name is not yet alive).
8536 We also want to avoid calling this a PARM if it is in a namespace. */
8538 if (decl_context == NORMAL && !toplevel_bindings_p ())
8540 cp_binding_level *b = current_binding_level;
8541 current_binding_level = b->level_chain;
8542 if (current_binding_level != 0 && toplevel_bindings_p ())
8543 decl_context = PARM;
8544 current_binding_level = b;
8548 name = decl_context == PARM ? "parameter" : "type name";
8550 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8552 error ("%<constexpr%> cannot appear in a typedef declaration");
8553 return error_mark_node;
8556 /* If there were multiple types specified in the decl-specifier-seq,
8557 issue an error message. */
8558 if (declspecs->multiple_types_p)
8560 error ("two or more data types in declaration of %qs", name);
8561 return error_mark_node;
8564 if (declspecs->conflicting_specifiers_p)
8566 error ("conflicting specifiers in declaration of %qs", name);
8567 return error_mark_node;
8570 /* Extract the basic type from the decl-specifier-seq. */
8571 type = declspecs->type;
8572 if (type == error_mark_node)
8575 type_was_error_mark_node = true;
8577 /* If the entire declaration is itself tagged as deprecated then
8578 suppress reports of deprecated items. */
8579 if (type && TREE_DEPRECATED (type)
8580 && deprecated_state != DEPRECATED_SUPPRESS)
8581 warn_deprecated_use (type, NULL_TREE);
8582 if (type && TREE_CODE (type) == TYPE_DECL)
8584 typedef_decl = type;
8585 type = TREE_TYPE (typedef_decl);
8586 if (TREE_DEPRECATED (type)
8587 && DECL_ARTIFICIAL (typedef_decl)
8588 && deprecated_state != DEPRECATED_SUPPRESS)
8589 warn_deprecated_use (type, NULL_TREE);
8591 /* No type at all: default to `int', and set DEFAULTED_INT
8592 because it was not a user-defined typedef. */
8593 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8595 /* These imply 'int'. */
8596 type = integer_type_node;
8600 explicit_int = declspecs->explicit_int_p;
8601 explicit_char = declspecs->explicit_char_p;
8604 /* See the code below that used this. */
8606 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8608 typedef_type = type;
8611 if (sfk != sfk_conversion)
8612 ctor_return_type = ctype;
8614 if (sfk != sfk_none)
8615 type = check_special_function_return_type (sfk, type,
8617 else if (type == NULL_TREE)
8623 /* We handle `main' specially here, because 'main () { }' is so
8624 common. With no options, it is allowed. With -Wreturn-type,
8625 it is a warning. It is only an error with -pedantic-errors. */
8626 is_main = (funcdef_flag
8627 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8628 && MAIN_NAME_P (dname)
8629 && ctype == NULL_TREE
8630 && in_namespace == NULL_TREE
8631 && current_namespace == global_namespace);
8633 if (type_was_error_mark_node)
8634 /* We've already issued an error, don't complain more. */;
8635 else if (in_system_header || flag_ms_extensions)
8636 /* Allow it, sigh. */;
8638 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8640 pedwarn (input_location, OPT_pedantic,
8641 "ISO C++ forbids declaration of %qs with no type", name);
8643 warning (OPT_Wreturn_type,
8644 "ISO C++ forbids declaration of %qs with no type", name);
8646 type = integer_type_node;
8651 if (explicit_int128)
8653 if (int128_integer_type_node == NULL_TREE)
8655 error ("%<__int128%> is not supported by this target");
8656 explicit_int128 = false;
8658 else if (pedantic && ! in_system_header)
8659 pedwarn (input_location, OPT_pedantic,
8660 "ISO C++ does not support %<__int128%> for %qs", name);
8663 /* Now process the modifiers that were specified
8664 and check for invalid combinations. */
8666 /* Long double is a special combination. */
8667 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8670 type = cp_build_qualified_type (long_double_type_node,
8671 cp_type_quals (type));
8674 /* Check all other uses of type modifiers. */
8676 if (unsigned_p || signed_p || long_p || short_p)
8680 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8681 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8682 else if (signed_p && unsigned_p)
8683 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8684 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8685 error ("%<long long%> invalid for %qs", name);
8686 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8687 error ("%<long%> invalid for %qs", name);
8688 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8689 error ("%<short%> invalid for %qs", name);
8690 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8691 error ("%<long%> or %<short%> invalid for %qs", name);
8692 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8693 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8694 else if ((long_p || short_p) && explicit_char)
8695 error ("%<long%> or %<short%> specified with char for %qs", name);
8696 else if (long_p && short_p)
8697 error ("%<long%> and %<short%> specified together for %qs", name);
8698 else if (type == char16_type_node || type == char32_type_node)
8700 if (signed_p || unsigned_p)
8701 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8702 else if (short_p || long_p)
8703 error ("%<short%> or %<long%> invalid for %qs", name);
8708 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8710 pedwarn (input_location, OPT_pedantic,
8711 "long, short, signed or unsigned used invalidly for %qs",
8713 if (flag_pedantic_errors)
8718 /* Discard the type modifiers if they are invalid. */
8729 /* Decide whether an integer type is signed or not.
8730 Optionally treat bitfields as signed by default. */
8734 It is implementation-defined whether a plain (neither
8735 explicitly signed or unsigned) char, short, int, or long
8736 bit-field is signed or unsigned.
8738 Naturally, we extend this to long long as well. Note that
8739 this does not include wchar_t. */
8740 || (bitfield && !flag_signed_bitfields
8742 /* A typedef for plain `int' without `signed' can be
8743 controlled just like plain `int', but a typedef for
8744 `signed int' cannot be so controlled. */
8746 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8747 && TREE_CODE (type) == INTEGER_TYPE
8748 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8750 if (explicit_int128)
8751 type = int128_unsigned_type_node;
8753 type = long_long_unsigned_type_node;
8755 type = long_unsigned_type_node;
8757 type = short_unsigned_type_node;
8758 else if (type == char_type_node)
8759 type = unsigned_char_type_node;
8760 else if (typedef_decl)
8761 type = unsigned_type_for (type);
8763 type = unsigned_type_node;
8765 else if (signed_p && type == char_type_node)
8766 type = signed_char_type_node;
8767 else if (explicit_int128)
8768 type = int128_integer_type_node;
8770 type = long_long_integer_type_node;
8772 type = long_integer_type_node;
8774 type = short_integer_type_node;
8776 if (declspecs->specs[(int)ds_complex])
8778 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8779 error ("complex invalid for %qs", name);
8780 /* If we just have "complex", it is equivalent to
8781 "complex double", but if any modifiers at all are specified it is
8782 the complex form of TYPE. E.g, "complex short" is
8783 "complex short int". */
8784 else if (defaulted_int && ! longlong && ! explicit_int128
8785 && ! (long_p || short_p || signed_p || unsigned_p))
8786 type = complex_double_type_node;
8787 else if (type == integer_type_node)
8788 type = complex_integer_type_node;
8789 else if (type == float_type_node)
8790 type = complex_float_type_node;
8791 else if (type == double_type_node)
8792 type = complex_double_type_node;
8793 else if (type == long_double_type_node)
8794 type = complex_long_double_type_node;
8796 type = build_complex_type (type);
8799 type_quals = TYPE_UNQUALIFIED;
8800 if (declspecs->specs[(int)ds_const])
8801 type_quals |= TYPE_QUAL_CONST;
8802 if (declspecs->specs[(int)ds_volatile])
8803 type_quals |= TYPE_QUAL_VOLATILE;
8804 if (declspecs->specs[(int)ds_restrict])
8805 type_quals |= TYPE_QUAL_RESTRICT;
8806 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8807 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8810 type_quals |= cp_type_quals (type);
8811 type = cp_build_qualified_type_real
8812 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8813 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8814 /* We might have ignored or rejected some of the qualifiers. */
8815 type_quals = cp_type_quals (type);
8818 inlinep = !! declspecs->specs[(int)ds_inline];
8819 virtualp = !! declspecs->specs[(int)ds_virtual];
8820 explicitp = !! declspecs->specs[(int)ds_explicit];
8822 storage_class = declspecs->storage_class;
8823 if (storage_class == sc_static)
8824 staticp = 1 + (decl_context == FIELD);
8826 if (virtualp && staticp == 2)
8828 error ("member %qD cannot be declared both virtual and static", dname);
8829 storage_class = sc_none;
8832 friendp = !! declspecs->specs[(int)ds_friend];
8834 if (dependent_name && !friendp)
8836 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8837 return error_mark_node;
8840 /* Issue errors about use of storage classes for parameters. */
8841 if (decl_context == PARM)
8843 if (declspecs->specs[(int)ds_typedef])
8845 error ("typedef declaration invalid in parameter declaration");
8846 return error_mark_node;
8848 else if (template_parm_flag && storage_class != sc_none)
8850 error ("storage class specified for template parameter %qs", name);
8851 return error_mark_node;
8853 else if (storage_class == sc_static
8854 || storage_class == sc_extern
8856 error ("storage class specifiers invalid in parameter declarations");
8858 /* Function parameters cannot be constexpr. If we saw one, moan
8859 and pretend it wasn't there. */
8862 error ("a parameter cannot be declared %<constexpr%>");
8867 /* Give error if `virtual' is used outside of class declaration. */
8869 && (current_class_name == NULL_TREE || decl_context != FIELD))
8871 error ("%<virtual%> outside class declaration");
8875 /* Static anonymous unions are dealt with here. */
8876 if (staticp && decl_context == TYPENAME
8878 && ANON_AGGR_TYPE_P (declspecs->type))
8879 decl_context = FIELD;
8881 /* Warn about storage classes that are invalid for certain
8882 kinds of declarations (parameters, typenames, etc.). */
8885 && storage_class != sc_extern
8886 && storage_class != sc_static)
8887 || declspecs->specs[(int)ds_typedef]))
8889 error ("multiple storage classes in declaration of %qs", name);
8892 if (decl_context != NORMAL
8893 && ((storage_class != sc_none
8894 && storage_class != sc_mutable)
8897 if ((decl_context == PARM || decl_context == CATCHPARM)
8898 && (storage_class == sc_register
8899 || storage_class == sc_auto))
8901 else if (declspecs->specs[(int)ds_typedef])
8903 else if (decl_context == FIELD
8904 /* C++ allows static class elements. */
8905 && storage_class == sc_static)
8906 /* C++ also allows inlines and signed and unsigned elements,
8907 but in those cases we don't come in here. */
8911 if (decl_context == FIELD)
8912 error ("storage class specified for %qs", name);
8915 if (decl_context == PARM || decl_context == CATCHPARM)
8916 error ("storage class specified for parameter %qs", name);
8918 error ("storage class specified for typename");
8920 if (storage_class == sc_register
8921 || storage_class == sc_auto
8922 || storage_class == sc_extern
8924 storage_class = sc_none;
8927 else if (storage_class == sc_extern && funcdef_flag
8928 && ! toplevel_bindings_p ())
8929 error ("nested function %qs declared %<extern%>", name);
8930 else if (toplevel_bindings_p ())
8932 if (storage_class == sc_auto)
8933 error ("top-level declaration of %qs specifies %<auto%>", name);
8936 && storage_class != sc_extern
8937 && storage_class != sc_static)
8939 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8944 if (storage_class && friendp)
8946 error ("storage class specifiers invalid in friend function declarations");
8947 storage_class = sc_none;
8952 unqualified_id = NULL_TREE;
8955 unqualified_id = id_declarator->u.id.unqualified_name;
8956 switch (TREE_CODE (unqualified_id))
8959 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8960 if (TYPE_P (unqualified_id))
8961 unqualified_id = constructor_name (unqualified_id);
8964 case IDENTIFIER_NODE:
8965 case TEMPLATE_ID_EXPR:
8973 /* Determine the type of the entity declared by recurring on the
8975 for (; declarator; declarator = declarator->declarator)
8977 const cp_declarator *inner_declarator;
8980 if (type == error_mark_node)
8981 return error_mark_node;
8983 attrs = declarator->attributes;
8989 if (declarator == NULL || declarator->kind == cdk_id)
8990 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8991 if (declarator->kind == cdk_function)
8992 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8993 if (declarator->kind == cdk_array)
8994 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8995 returned_attrs = decl_attributes (&type,
8996 chainon (returned_attrs, attrs),
9000 if (declarator->kind == cdk_id)
9003 inner_declarator = declarator->declarator;
9005 switch (declarator->kind)
9008 type = create_array_type_for_decl (dname, type,
9009 declarator->u.array.bounds);
9017 /* Declaring a function type.
9018 Make sure we have a valid type for the function to return. */
9020 if (type_quals != TYPE_UNQUALIFIED)
9022 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9023 warning (OPT_Wignored_qualifiers,
9024 "type qualifiers ignored on function return type");
9025 /* We now know that the TYPE_QUALS don't apply to the
9026 decl, but to its return type. */
9027 type_quals = TYPE_UNQUALIFIED;
9029 errmsg = targetm.invalid_return_type (type);
9033 type = integer_type_node;
9036 /* Error about some types functions can't return. */
9038 if (TREE_CODE (type) == FUNCTION_TYPE)
9040 error ("%qs declared as function returning a function", name);
9041 return error_mark_node;
9043 if (TREE_CODE (type) == ARRAY_TYPE)
9045 error ("%qs declared as function returning an array", name);
9046 return error_mark_node;
9049 /* Pick up type qualifiers which should be applied to `this'. */
9050 memfn_quals = declarator->u.function.qualifiers;
9051 /* Pick up virt-specifiers. */
9052 virt_specifiers = declarator->u.function.virt_specifiers;
9053 /* Pick up the exception specifications. */
9054 raises = declarator->u.function.exception_specification;
9055 /* If the exception-specification is ill-formed, let's pretend
9056 there wasn't one. */
9057 if (raises == error_mark_node)
9060 /* Say it's a definition only for the CALL_EXPR
9061 closest to the identifier. */
9062 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9064 /* Handle a late-specified return type. */
9067 if (type_uses_auto (type))
9069 if (!declarator->u.function.late_return_type)
9071 error ("%qs function uses %<auto%> type specifier without"
9072 " late return type", name);
9073 return error_mark_node;
9075 else if (!is_auto (type))
9077 error ("%qs function with late return type has"
9078 " %qT as its type rather than plain %<auto%>",
9080 return error_mark_node;
9083 else if (declarator->u.function.late_return_type)
9085 error ("%qs function with late return type not declared"
9086 " with %<auto%> type specifier", name);
9087 return error_mark_node;
9090 type = splice_late_return_type
9091 (type, declarator->u.function.late_return_type);
9092 if (type == error_mark_node)
9093 return error_mark_node;
9095 if (ctype == NULL_TREE
9096 && decl_context == FIELD
9098 && (friendp == 0 || dname == current_class_name))
9099 ctype = current_class_type;
9101 if (ctype && (sfk == sfk_constructor
9102 || sfk == sfk_destructor))
9104 /* We are within a class's scope. If our declarator name
9105 is the same as the class name, and we are defining
9106 a function, then it is a constructor/destructor, and
9107 therefore returns a void type. */
9109 /* ISO C++ 12.4/2. A destructor may not be declared
9110 const or volatile. A destructor may not be
9113 ISO C++ 12.1. A constructor may not be declared
9114 const or volatile. A constructor may not be
9115 virtual. A constructor may not be static. */
9117 error ((flags == DTOR_FLAG)
9118 ? "destructor cannot be static member function"
9119 : "constructor cannot be static member function");
9122 error ((flags == DTOR_FLAG)
9123 ? "destructors may not be cv-qualified"
9124 : "constructors may not be cv-qualified");
9125 memfn_quals = TYPE_UNQUALIFIED;
9128 if (decl_context == FIELD
9129 && !member_function_or_else (ctype,
9132 return error_mark_node;
9134 if (flags != DTOR_FLAG)
9136 /* It's a constructor. */
9141 permerror (input_location, "constructors cannot be declared virtual");
9144 if (decl_context == FIELD
9145 && sfk != sfk_constructor)
9146 return error_mark_node;
9148 if (decl_context == FIELD)
9154 error ("can%'t initialize friend function %qs", name);
9157 /* Cannot be both friend and virtual. */
9158 error ("virtual functions cannot be friends");
9161 if (decl_context == NORMAL)
9162 error ("friend declaration not in class definition");
9163 if (current_function_decl && funcdef_flag)
9164 error ("can%'t define friend function %qs in a local "
9168 else if (ctype && sfk == sfk_conversion)
9172 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9177 arg_types = grokparms (declarator->u.function.parameters,
9180 if (inner_declarator
9181 && inner_declarator->kind == cdk_id
9182 && inner_declarator->u.id.sfk == sfk_destructor
9183 && arg_types != void_list_node)
9185 error ("destructors may not have parameters");
9186 arg_types = void_list_node;
9190 type = build_function_type (type, arg_types);
9197 /* Filter out pointers-to-references and references-to-references.
9198 We can get these if a TYPE_DECL is used. */
9200 if (TREE_CODE (type) == REFERENCE_TYPE)
9202 if (declarator->kind != cdk_reference)
9204 error ("cannot declare pointer to %q#T", type);
9205 type = TREE_TYPE (type);
9208 /* In C++0x, we allow reference to reference declarations
9209 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9210 and template type arguments [14.3.1/4 temp.arg.type]. The
9211 check for direct reference to reference declarations, which
9212 are still forbidden, occurs below. Reasoning behind the change
9213 can be found in DR106, DR540, and the rvalue reference
9215 else if (cxx_dialect == cxx98)
9217 error ("cannot declare reference to %q#T", type);
9218 type = TREE_TYPE (type);
9221 else if (VOID_TYPE_P (type))
9223 if (declarator->kind == cdk_reference)
9224 error ("cannot declare reference to %q#T", type);
9225 else if (declarator->kind == cdk_ptrmem)
9226 error ("cannot declare pointer to %q#T member", type);
9229 /* We now know that the TYPE_QUALS don't apply to the decl,
9230 but to the target of the pointer. */
9231 type_quals = TYPE_UNQUALIFIED;
9233 if (declarator->kind == cdk_ptrmem
9234 && (TREE_CODE (type) == FUNCTION_TYPE
9235 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9237 memfn_quals |= type_memfn_quals (type);
9238 type = build_memfn_type (type,
9239 declarator->u.pointer.class_type,
9241 if (type == error_mark_node)
9242 return error_mark_node;
9243 memfn_quals = TYPE_UNQUALIFIED;
9246 if (TREE_CODE (type) == FUNCTION_TYPE
9247 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9248 error (declarator->kind == cdk_reference
9249 ? G_("cannot declare reference to qualified function type %qT")
9250 : G_("cannot declare pointer to qualified function type %qT"),
9253 /* When the pointed-to type involves components of variable size,
9254 care must be taken to ensure that the size evaluation code is
9255 emitted early enough to dominate all the possible later uses
9256 and late enough for the variables on which it depends to have
9259 This is expected to happen automatically when the pointed-to
9260 type has a name/declaration of it's own, but special attention
9261 is required if the type is anonymous.
9263 We handle the NORMAL and FIELD contexts here by inserting a
9264 dummy statement that just evaluates the size at a safe point
9265 and ensures it is not deferred until e.g. within a deeper
9266 conditional context (c++/43555).
9268 We expect nothing to be needed here for PARM or TYPENAME.
9269 Evaluating the size at this point for TYPENAME would
9270 actually be incorrect, as we might be in the middle of an
9271 expression with side effects on the pointed-to type size
9272 "arguments" prior to the pointer declaration point and the
9273 size evaluation could end up prior to the side effects. */
9275 if (!TYPE_NAME (type)
9276 && (decl_context == NORMAL || decl_context == FIELD)
9277 && at_function_scope_p ()
9278 && variably_modified_type_p (type, NULL_TREE))
9280 /* First break out any side-effects. */
9281 stabilize_vla_size (TYPE_SIZE (type));
9282 /* And then force evaluation of the SAVE_EXPR. */
9283 finish_expr_stmt (TYPE_SIZE (type));
9286 if (declarator->kind == cdk_reference)
9288 /* In C++0x, the type we are creating a reference to might be
9289 a typedef which is itself a reference type. In that case,
9290 we follow the reference collapsing rules in
9291 [7.1.3/8 dcl.typedef] to create the final reference type:
9293 "If a typedef TD names a type that is a reference to a type
9294 T, an attempt to create the type 'lvalue reference to cv TD'
9295 creates the type 'lvalue reference to T,' while an attempt
9296 to create the type "rvalue reference to cv TD' creates the
9299 if (VOID_TYPE_P (type))
9300 /* We already gave an error. */;
9301 else if (TREE_CODE (type) == REFERENCE_TYPE)
9303 if (declarator->u.reference.rvalue_ref)
9304 /* Leave type alone. */;
9306 type = cp_build_reference_type (TREE_TYPE (type), false);
9309 type = cp_build_reference_type
9310 (type, declarator->u.reference.rvalue_ref);
9312 /* In C++0x, we need this check for direct reference to
9313 reference declarations, which are forbidden by
9314 [8.3.2/5 dcl.ref]. Reference to reference declarations
9315 are only allowed indirectly through typedefs and template
9316 type arguments. Example:
9318 void foo(int & &); // invalid ref-to-ref decl
9320 typedef int & int_ref;
9321 void foo(int_ref &); // valid ref-to-ref decl
9323 if (inner_declarator && inner_declarator->kind == cdk_reference)
9324 error ("cannot declare reference to %q#T, which is not "
9325 "a typedef or a template type argument", type);
9327 else if (TREE_CODE (type) == METHOD_TYPE)
9328 type = build_ptrmemfunc_type (build_pointer_type (type));
9329 else if (declarator->kind == cdk_ptrmem)
9331 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9333 if (declarator->u.pointer.class_type == error_mark_node)
9334 /* We will already have complained. */
9335 type = error_mark_node;
9337 type = build_ptrmem_type (declarator->u.pointer.class_type,
9341 type = build_pointer_type (type);
9343 /* Process a list of type modifier keywords (such as
9344 const or volatile) that were given inside the `*' or `&'. */
9346 if (declarator->u.pointer.qualifiers)
9349 = cp_build_qualified_type (type,
9350 declarator->u.pointer.qualifiers);
9351 type_quals = cp_type_quals (type);
9364 /* We need to stabilize side-effects in VLA sizes for regular array
9365 declarations too, not just pointers to arrays. */
9366 if (type != error_mark_node && !TYPE_NAME (type)
9367 && (decl_context == NORMAL || decl_context == FIELD)
9368 && at_function_scope_p ()
9369 && variably_modified_type_p (type, NULL_TREE))
9370 stabilize_vla_size (TYPE_SIZE (type));
9372 /* A `constexpr' specifier used in an object declaration declares
9373 the object as `const'. */
9374 if (constexpr_p && innermost_code != cdk_function)
9376 if (type_quals & TYPE_QUAL_CONST)
9377 error ("both %<const%> and %<constexpr%> cannot be used here");
9378 if (type_quals & TYPE_QUAL_VOLATILE)
9379 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9380 if (TREE_CODE (type) != REFERENCE_TYPE)
9382 type_quals |= TYPE_QUAL_CONST;
9383 type = cp_build_qualified_type (type, type_quals);
9387 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9388 && TREE_CODE (type) != FUNCTION_TYPE
9389 && TREE_CODE (type) != METHOD_TYPE)
9391 error ("template-id %qD used as a declarator",
9393 unqualified_id = dname;
9396 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9397 qualified with a class-name, turn it into a METHOD_TYPE, unless
9398 we know that the function is static. We take advantage of this
9399 opportunity to do other processing that pertains to entities
9400 explicitly declared to be class members. Note that if DECLARATOR
9401 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9402 would not have exited the loop above. */
9404 && declarator->u.id.qualifying_scope
9405 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9409 ctype = declarator->u.id.qualifying_scope;
9410 ctype = TYPE_MAIN_VARIANT (ctype);
9412 while (t != NULL_TREE && CLASS_TYPE_P (t))
9414 /* You're supposed to have one `template <...>' for every
9415 template class, but you don't need one for a full
9416 specialization. For example:
9418 template <class T> struct S{};
9419 template <> struct S<int> { void f(); };
9420 void S<int>::f () {}
9422 is correct; there shouldn't be a `template <>' for the
9423 definition of `S<int>::f'. */
9424 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9425 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9426 /* T is an explicit (not partial) specialization. All
9427 containing classes must therefore also be explicitly
9430 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9431 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9432 template_count += 1;
9434 t = TYPE_MAIN_DECL (t);
9435 t = DECL_CONTEXT (t);
9438 if (ctype == current_class_type)
9442 permerror (input_location, "member functions are implicitly friends of their class");
9446 permerror (declarator->id_loc,
9447 "extra qualification %<%T::%> on member %qs",
9450 else if (/* If the qualifying type is already complete, then we
9451 can skip the following checks. */
9452 !COMPLETE_TYPE_P (ctype)
9453 && (/* If the function is being defined, then
9454 qualifying type must certainly be complete. */
9456 /* A friend declaration of "T::f" is OK, even if
9457 "T" is a template parameter. But, if this
9458 function is not a friend, the qualifying type
9460 || (!friendp && !CLASS_TYPE_P (ctype))
9461 /* For a declaration, the type need not be
9462 complete, if either it is dependent (since there
9463 is no meaningful definition of complete in that
9464 case) or the qualifying class is currently being
9466 || !(dependent_type_p (ctype)
9467 || currently_open_class (ctype)))
9468 /* Check that the qualifying type is complete. */
9469 && !complete_type_or_else (ctype, NULL_TREE))
9470 return error_mark_node;
9471 else if (TREE_CODE (type) == FUNCTION_TYPE)
9473 if (current_class_type
9474 && (!friendp || funcdef_flag))
9477 ? "cannot define member function %<%T::%s%> within %<%T%>"
9478 : "cannot declare member function %<%T::%s%> within %<%T%>",
9479 ctype, name, current_class_type);
9480 return error_mark_node;
9483 else if (declspecs->specs[(int)ds_typedef]
9484 && current_class_type)
9486 error ("cannot declare member %<%T::%s%> within %qT",
9487 ctype, name, current_class_type);
9488 return error_mark_node;
9492 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9493 ctype = current_class_type;
9495 /* Now TYPE has the actual type. */
9500 *attrlist = chainon (returned_attrs, *attrlist);
9502 attrlist = &returned_attrs;
9505 /* Handle parameter packs. */
9506 if (parameter_pack_p)
9508 if (decl_context == PARM)
9509 /* Turn the type into a pack expansion.*/
9510 type = make_pack_expansion (type);
9512 error ("non-parameter %qs cannot be a parameter pack", name);
9515 /* Did array size calculations overflow? */
9517 if (TREE_CODE (type) == ARRAY_TYPE
9518 && COMPLETE_TYPE_P (type)
9519 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9520 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9522 error ("size of array %qs is too large", name);
9523 /* If we proceed with the array type as it is, we'll eventually
9524 crash in tree_low_cst(). */
9525 type = error_mark_node;
9528 if ((decl_context == FIELD || decl_context == PARM)
9529 && !processing_template_decl
9530 && variably_modified_type_p (type, NULL_TREE))
9532 if (decl_context == FIELD)
9533 error ("data member may not have variably modified type %qT", type);
9535 error ("parameter may not have variably modified type %qT", type);
9536 type = error_mark_node;
9539 if (explicitp == 1 || (explicitp && friendp))
9541 /* [dcl.fct.spec] The explicit specifier shall only be used in
9542 declarations of constructors within a class definition. */
9543 error ("only declarations of constructors can be %<explicit%>");
9547 if (storage_class == sc_mutable)
9549 if (decl_context != FIELD || friendp)
9551 error ("non-member %qs cannot be declared %<mutable%>", name);
9552 storage_class = sc_none;
9554 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9556 error ("non-object member %qs cannot be declared %<mutable%>", name);
9557 storage_class = sc_none;
9559 else if (TREE_CODE (type) == FUNCTION_TYPE
9560 || TREE_CODE (type) == METHOD_TYPE)
9562 error ("function %qs cannot be declared %<mutable%>", name);
9563 storage_class = sc_none;
9567 error ("static %qs cannot be declared %<mutable%>", name);
9568 storage_class = sc_none;
9570 else if (type_quals & TYPE_QUAL_CONST)
9572 error ("const %qs cannot be declared %<mutable%>", name);
9573 storage_class = sc_none;
9575 else if (TREE_CODE (type) == REFERENCE_TYPE)
9577 permerror (input_location, "reference %qs cannot be declared "
9578 "%<mutable%>", name);
9579 storage_class = sc_none;
9583 /* If this is declaring a typedef name, return a TYPE_DECL. */
9584 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9588 /* Note that the grammar rejects storage classes
9589 in typenames, fields or parameters. */
9590 if (current_lang_name == lang_name_java)
9591 TYPE_FOR_JAVA (type) = 1;
9593 /* This declaration:
9595 typedef void f(int) const;
9597 declares a function type which is not a member of any
9598 particular class, but which is cv-qualified; for
9599 example "f S::*" declares a pointer to a const-qualified
9600 member function of S. We record the cv-qualification in the
9602 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9604 type = apply_memfn_quals (type, memfn_quals);
9606 /* We have now dealt with these qualifiers. */
9607 memfn_quals = TYPE_UNQUALIFIED;
9610 if (type_uses_auto (type))
9612 error ("typedef declared %<auto%>");
9613 type = error_mark_node;
9616 if (decl_context == FIELD)
9617 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9619 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9620 if (id_declarator && declarator->u.id.qualifying_scope) {
9621 error_at (DECL_SOURCE_LOCATION (decl),
9622 "typedef name may not be a nested-name-specifier");
9623 TREE_TYPE (decl) = error_mark_node;
9626 if (decl_context != FIELD)
9628 if (!current_function_decl)
9629 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9630 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9631 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9632 (current_function_decl)))
9633 /* The TYPE_DECL is "abstract" because there will be
9634 clones of this constructor/destructor, and there will
9635 be copies of this TYPE_DECL generated in those
9637 DECL_ABSTRACT (decl) = 1;
9639 else if (constructor_name_p (unqualified_id, current_class_type))
9640 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9641 "as enclosing class",
9644 /* If the user declares "typedef struct {...} foo" then the
9645 struct will have an anonymous name. Fill that name in now.
9646 Nothing can refer to it, so nothing needs know about the name
9648 if (type != error_mark_node
9651 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9652 && TYPE_ANONYMOUS_P (type)
9653 && declspecs->type_definition_p
9654 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9658 /* Replace the anonymous name with the real name everywhere. */
9659 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9661 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9662 /* We do not rename the debug info representing the
9663 anonymous tagged type because the standard says in
9664 [dcl.typedef] that the naming applies only for
9665 linkage purposes. */
9666 /*debug_hooks->set_name (t, decl);*/
9667 TYPE_NAME (t) = decl;
9670 if (TYPE_LANG_SPECIFIC (type))
9671 TYPE_WAS_ANONYMOUS (type) = 1;
9673 /* If this is a typedef within a template class, the nested
9674 type is a (non-primary) template. The name for the
9675 template needs updating as well. */
9676 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9677 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9678 = TYPE_IDENTIFIER (type);
9680 /* Adjust linkage now that we aren't anonymous anymore. */
9681 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9682 determine_visibility (TYPE_MAIN_DECL (type));
9684 /* FIXME remangle member functions; member functions of a
9685 type with external linkage have external linkage. */
9689 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9690 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9692 bad_specifiers (decl, BSP_TYPE, virtualp,
9693 memfn_quals != TYPE_UNQUALIFIED,
9694 inlinep, friendp, raises != NULL_TREE);
9699 /* Detect the case of an array type of unspecified size
9700 which came, as such, direct from a typedef name.
9701 We must copy the type, so that the array's domain can be
9702 individually set by the object's initializer. */
9704 if (type && typedef_type
9705 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9706 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9707 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9709 /* Detect where we're using a typedef of function type to declare a
9710 function. PARMS will not be set, so we must create it now. */
9712 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9714 tree decls = NULL_TREE;
9717 for (args = TYPE_ARG_TYPES (type);
9718 args && args != void_list_node;
9719 args = TREE_CHAIN (args))
9721 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9723 DECL_CHAIN (decl) = decls;
9727 parms = nreverse (decls);
9729 if (decl_context != TYPENAME)
9731 /* A cv-qualifier-seq shall only be part of the function type
9732 for a non-static member function. [8.3.5/4 dcl.fct] */
9733 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9734 && (current_class_type == NULL_TREE || staticp) )
9737 ? G_("qualified function types cannot be used to "
9738 "declare static member functions")
9739 : G_("qualified function types cannot be used to "
9740 "declare free functions"));
9741 type = TYPE_MAIN_VARIANT (type);
9744 /* The qualifiers on the function type become the qualifiers on
9745 the non-static member function. */
9746 memfn_quals |= type_memfn_quals (type);
9747 type_quals = TYPE_UNQUALIFIED;
9751 /* If this is a type name (such as, in a cast or sizeof),
9752 compute the type and return it now. */
9754 if (decl_context == TYPENAME)
9756 /* Note that the grammar rejects storage classes
9757 in typenames, fields or parameters. */
9758 if (type_quals != TYPE_UNQUALIFIED)
9759 type_quals = TYPE_UNQUALIFIED;
9761 /* Special case: "friend class foo" looks like a TYPENAME context. */
9764 if (type_quals != TYPE_UNQUALIFIED)
9766 error ("type qualifiers specified for friend class declaration");
9767 type_quals = TYPE_UNQUALIFIED;
9771 error ("%<inline%> specified for friend class declaration");
9777 /* Don't allow friend declaration without a class-key. */
9778 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9779 permerror (input_location, "template parameters cannot be friends");
9780 else if (TREE_CODE (type) == TYPENAME_TYPE)
9781 permerror (input_location, "friend declaration requires class-key, "
9782 "i.e. %<friend class %T::%D%>",
9783 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9785 permerror (input_location, "friend declaration requires class-key, "
9786 "i.e. %<friend %#T%>",
9790 /* Only try to do this stuff if we didn't already give up. */
9791 if (type != integer_type_node)
9793 /* A friendly class? */
9794 if (current_class_type)
9795 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9798 error ("trying to make class %qT a friend of global scope",
9801 type = void_type_node;
9804 else if (memfn_quals)
9806 if (ctype == NULL_TREE
9807 && TREE_CODE (type) == METHOD_TYPE)
9808 ctype = TYPE_METHOD_BASETYPE (type);
9811 type = build_memfn_type (type, ctype, memfn_quals);
9812 /* Core issue #547: need to allow this in template type args. */
9813 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9814 type = apply_memfn_quals (type, memfn_quals);
9816 error ("invalid qualifiers on non-member function type");
9821 else if (unqualified_id == NULL_TREE && decl_context != PARM
9822 && decl_context != CATCHPARM
9823 && TREE_CODE (type) != UNION_TYPE
9826 error ("abstract declarator %qT used as declaration", type);
9827 return error_mark_node;
9830 /* Only functions may be declared using an operator-function-id. */
9832 && IDENTIFIER_OPNAME_P (unqualified_id)
9833 && TREE_CODE (type) != FUNCTION_TYPE
9834 && TREE_CODE (type) != METHOD_TYPE)
9836 error ("declaration of %qD as non-function", unqualified_id);
9837 return error_mark_node;
9840 /* We don't check parameter types here because we can emit a better
9841 error message later. */
9842 if (decl_context != PARM)
9844 type = check_var_type (unqualified_id, type);
9845 if (type == error_mark_node)
9846 return error_mark_node;
9849 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9850 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9852 if (decl_context == PARM || decl_context == CATCHPARM)
9854 if (ctype || in_namespace)
9855 error ("cannot use %<::%> in parameter declaration");
9857 if (type_uses_auto (type))
9859 error ("parameter declared %<auto%>");
9860 type = error_mark_node;
9863 /* A parameter declared as an array of T is really a pointer to T.
9864 One declared as a function is really a pointer to a function.
9865 One declared as a member is really a pointer to member. */
9867 if (TREE_CODE (type) == ARRAY_TYPE)
9869 /* Transfer const-ness of array into that of type pointed to. */
9870 type = build_pointer_type (TREE_TYPE (type));
9871 type_quals = TYPE_UNQUALIFIED;
9873 else if (TREE_CODE (type) == FUNCTION_TYPE)
9874 type = build_pointer_type (type);
9877 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9878 && !NEW_DELETE_OPNAME_P (unqualified_id))
9880 cp_cv_quals real_quals = memfn_quals;
9881 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9882 real_quals |= TYPE_QUAL_CONST;
9883 type = build_memfn_type (type, ctype, real_quals);
9889 if (decl_context == PARM)
9891 decl = cp_build_parm_decl (unqualified_id, type);
9893 bad_specifiers (decl, BSP_PARM, virtualp,
9894 memfn_quals != TYPE_UNQUALIFIED,
9895 inlinep, friendp, raises != NULL_TREE);
9897 else if (decl_context == FIELD)
9899 /* The C99 flexible array extension. */
9900 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9901 && TYPE_DOMAIN (type) == NULL_TREE)
9903 tree itype = compute_array_index_type (dname, integer_zero_node,
9904 tf_warning_or_error);
9905 type = build_cplus_array_type (TREE_TYPE (type), itype);
9908 if (type == error_mark_node)
9910 /* Happens when declaring arrays of sizes which
9911 are error_mark_node, for example. */
9914 else if (in_namespace && !friendp)
9916 /* Something like struct S { int N::j; }; */
9917 error ("invalid use of %<::%>");
9918 return error_mark_node;
9920 else if (TREE_CODE (type) == FUNCTION_TYPE
9921 || TREE_CODE (type) == METHOD_TYPE)
9924 tree function_context;
9928 /* This should never happen in pure C++ (the check
9929 could be an assert). It could happen in
9930 Objective-C++ if someone writes invalid code that
9931 uses a function declaration for an instance
9932 variable or property (instance variables and
9933 properties are parsed as FIELD_DECLs, but they are
9934 part of an Objective-C class, not a C++ class).
9935 That code is invalid and is caught by this
9939 error ("declaration of function %qD in invalid context",
9941 return error_mark_node;
9944 /* ``A union may [ ... ] not [ have ] virtual functions.''
9946 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9948 error ("function %qD declared virtual inside a union",
9950 return error_mark_node;
9953 if (NEW_DELETE_OPNAME_P (unqualified_id))
9957 error ("%qD cannot be declared virtual, since it "
9965 /* Check that the name used for a destructor makes sense. */
9966 if (sfk == sfk_destructor)
9968 tree uqname = id_declarator->u.id.unqualified_name;
9972 gcc_assert (friendp);
9973 error ("expected qualified name in friend declaration "
9974 "for destructor %qD", uqname);
9975 return error_mark_node;
9978 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9980 error ("declaration of %qD as member of %qT",
9982 return error_mark_node;
9986 error ("a destructor cannot be %<constexpr%>");
9987 return error_mark_node;
9990 else if (sfk == sfk_constructor && friendp && !ctype)
9992 error ("expected qualified name in friend declaration "
9993 "for constructor %qD",
9994 id_declarator->u.id.unqualified_name);
9995 return error_mark_node;
9998 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9999 function_context = (ctype != NULL_TREE) ?
10000 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10001 publicp = (! friendp || ! staticp)
10002 && function_context == NULL_TREE;
10003 decl = grokfndecl (ctype, type,
10004 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10005 ? unqualified_id : dname,
10008 virtualp, flags, memfn_quals, raises,
10009 friendp ? -1 : 0, friendp, publicp,
10010 inlinep | (2 * constexpr_p),
10012 funcdef_flag, template_count, in_namespace,
10013 attrlist, declarator->id_loc);
10014 decl = set_virt_specifiers (decl, virt_specifiers);
10015 if (decl == NULL_TREE)
10016 return error_mark_node;
10018 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10019 /* The decl and setting of decl_attr is also turned off. */
10020 decl = build_decl_attribute_variant (decl, decl_attr);
10023 /* [class.conv.ctor]
10025 A constructor declared without the function-specifier
10026 explicit that can be called with a single parameter
10027 specifies a conversion from the type of its first
10028 parameter to the type of its class. Such a constructor
10029 is called a converting constructor. */
10030 if (explicitp == 2)
10031 DECL_NONCONVERTING_P (decl) = 1;
10033 else if (!staticp && !dependent_type_p (type)
10034 && !COMPLETE_TYPE_P (complete_type (type))
10035 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10037 if (unqualified_id)
10038 error ("field %qD has incomplete type", unqualified_id);
10040 error ("name %qT has incomplete type", type);
10042 /* If we're instantiating a template, tell them which
10043 instantiation made the field's type be incomplete. */
10044 if (current_class_type
10045 && TYPE_NAME (current_class_type)
10046 && IDENTIFIER_TEMPLATE (current_class_name)
10048 && declspecs->type == type)
10049 error (" in instantiation of template %qT",
10050 current_class_type);
10052 return error_mark_node;
10058 error ("%qE is neither function nor member function; "
10059 "cannot be declared friend", unqualified_id);
10067 /* Friends are treated specially. */
10068 if (ctype == current_class_type)
10069 ; /* We already issued a permerror. */
10070 else if (decl && DECL_NAME (decl))
10072 if (template_class_depth (current_class_type) == 0)
10074 decl = check_explicit_specialization
10075 (unqualified_id, decl, template_count,
10076 2 * funcdef_flag + 4);
10077 if (decl == error_mark_node)
10078 return error_mark_node;
10081 decl = do_friend (ctype, unqualified_id, decl,
10087 return error_mark_node;
10090 /* Structure field. It may not be a function, except for C++. */
10092 if (decl == NULL_TREE)
10096 /* C++ allows static class members. All other work
10097 for this is done by grokfield. */
10098 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10099 set_linkage_for_static_data_member (decl);
10100 /* Even if there is an in-class initialization, DECL
10101 is considered undefined until an out-of-class
10102 definition is provided. */
10103 DECL_EXTERNAL (decl) = 1;
10106 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10108 if (constexpr_p && !initialized)
10110 error ("constexpr static data member %qD must have an "
10111 "initializer", decl);
10112 constexpr_p = false;
10119 error ("non-static data member %qE declared %<constexpr%>",
10121 constexpr_p = false;
10123 decl = build_decl (input_location,
10124 FIELD_DECL, unqualified_id, type);
10125 DECL_NONADDRESSABLE_P (decl) = bitfield;
10126 if (bitfield && !unqualified_id)
10127 TREE_NO_WARNING (decl) = 1;
10129 if (storage_class == sc_mutable)
10131 DECL_MUTABLE_P (decl) = 1;
10132 storage_class = sc_none;
10136 /* An attempt is being made to initialize a non-static
10137 member. This is new in C++11. */
10138 maybe_warn_cpp0x (CPP0X_NSDMI);
10141 bad_specifiers (decl, BSP_FIELD, virtualp,
10142 memfn_quals != TYPE_UNQUALIFIED,
10143 inlinep, friendp, raises != NULL_TREE);
10146 else if (TREE_CODE (type) == FUNCTION_TYPE
10147 || TREE_CODE (type) == METHOD_TYPE)
10149 tree original_name;
10152 if (!unqualified_id)
10153 return error_mark_node;
10155 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10156 original_name = dname;
10158 original_name = unqualified_id;
10160 if (storage_class == sc_auto)
10161 error ("storage class %<auto%> invalid for function %qs", name);
10162 else if (storage_class == sc_register)
10163 error ("storage class %<register%> invalid for function %qs", name);
10165 error ("storage class %<__thread%> invalid for function %qs", name);
10167 if (virt_specifiers)
10168 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10169 /* Function declaration not at top level.
10170 Storage classes other than `extern' are not allowed
10171 and `extern' makes no difference. */
10172 if (! toplevel_bindings_p ()
10173 && (storage_class == sc_static
10174 || declspecs->specs[(int)ds_inline])
10177 if (storage_class == sc_static)
10178 pedwarn (input_location, OPT_pedantic,
10179 "%<static%> specified invalid for function %qs "
10180 "declared out of global scope", name);
10182 pedwarn (input_location, OPT_pedantic,
10183 "%<inline%> specifier invalid for function %qs "
10184 "declared out of global scope", name);
10187 if (ctype == NULL_TREE)
10191 error ("virtual non-class function %qs", name);
10194 else if (sfk == sfk_constructor
10195 || sfk == sfk_destructor)
10197 error (funcdef_flag
10198 ? "%qs defined in a non-class scope"
10199 : "%qs declared in a non-class scope", name);
10204 /* Record presence of `static'. */
10205 publicp = (ctype != NULL_TREE
10206 || storage_class == sc_extern
10207 || storage_class != sc_static);
10209 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10210 virtualp, flags, memfn_quals, raises,
10212 publicp, inlinep | (2 * constexpr_p), sfk,
10214 template_count, in_namespace, attrlist,
10215 declarator->id_loc);
10216 if (decl == NULL_TREE)
10217 return error_mark_node;
10221 int invalid_static = 0;
10223 /* Don't allow a static member function in a class, and forbid
10224 declaring main to be static. */
10225 if (TREE_CODE (type) == METHOD_TYPE)
10227 permerror (input_location, "cannot declare member function %qD to have "
10228 "static linkage", decl);
10229 invalid_static = 1;
10231 else if (current_function_decl)
10233 /* FIXME need arm citation */
10234 error ("cannot declare static function inside another function");
10235 invalid_static = 1;
10238 if (invalid_static)
10241 storage_class = sc_none;
10247 /* It's a variable. */
10249 /* An uninitialized decl with `extern' is a reference. */
10250 decl = grokvardecl (type, unqualified_id,
10253 (type_quals & TYPE_QUAL_CONST) != 0,
10254 ctype ? ctype : in_namespace);
10255 bad_specifiers (decl, BSP_VAR, virtualp,
10256 memfn_quals != TYPE_UNQUALIFIED,
10257 inlinep, friendp, raises != NULL_TREE);
10261 DECL_CONTEXT (decl) = ctype;
10264 permerror (input_location, "%<static%> may not be used when defining "
10265 "(as opposed to declaring) a static data member");
10267 storage_class = sc_none;
10269 if (storage_class == sc_register && TREE_STATIC (decl))
10271 error ("static member %qD declared %<register%>", decl);
10272 storage_class = sc_none;
10274 if (storage_class == sc_extern && pedantic)
10276 pedwarn (input_location, OPT_pedantic,
10277 "cannot explicitly declare member %q#D to have "
10278 "extern linkage", decl);
10279 storage_class = sc_none;
10282 else if (constexpr_p && DECL_EXTERNAL (decl))
10284 error ("declaration of constexpr variable %qD is not a definition",
10286 constexpr_p = false;
10290 if (storage_class == sc_extern && initialized && !funcdef_flag)
10292 if (toplevel_bindings_p ())
10294 /* It's common practice (and completely valid) to have a const
10295 be initialized and declared extern. */
10296 if (!(type_quals & TYPE_QUAL_CONST))
10297 warning (0, "%qs initialized and declared %<extern%>", name);
10301 error ("%qs has both %<extern%> and initializer", name);
10302 return error_mark_node;
10306 /* Record `register' declaration for warnings on &
10307 and in case doing stupid register allocation. */
10309 if (storage_class == sc_register)
10310 DECL_REGISTER (decl) = 1;
10311 else if (storage_class == sc_extern)
10312 DECL_THIS_EXTERN (decl) = 1;
10313 else if (storage_class == sc_static)
10314 DECL_THIS_STATIC (decl) = 1;
10316 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10317 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10318 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10320 /* Record constancy and volatility on the DECL itself . There's
10321 no need to do this when processing a template; we'll do this
10322 for the instantiated declaration based on the type of DECL. */
10323 if (!processing_template_decl)
10324 cp_apply_type_quals_to_decl (type_quals, decl);
10330 /* Subroutine of start_function. Ensure that each of the parameter
10331 types (as listed in PARMS) is complete, as is required for a
10332 function definition. */
10335 require_complete_types_for_parms (tree parms)
10337 for (; parms; parms = DECL_CHAIN (parms))
10339 if (dependent_type_p (TREE_TYPE (parms)))
10341 if (!VOID_TYPE_P (TREE_TYPE (parms))
10342 && complete_type_or_else (TREE_TYPE (parms), parms))
10344 relayout_decl (parms);
10345 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10348 /* grokparms or complete_type_or_else will have already issued
10350 TREE_TYPE (parms) = error_mark_node;
10354 /* Returns nonzero if T is a local variable. */
10357 local_variable_p (const_tree t)
10359 if ((TREE_CODE (t) == VAR_DECL
10360 /* A VAR_DECL with a context that is a _TYPE is a static data
10362 && !TYPE_P (CP_DECL_CONTEXT (t))
10363 /* Any other non-local variable must be at namespace scope. */
10364 && !DECL_NAMESPACE_SCOPE_P (t))
10365 || (TREE_CODE (t) == PARM_DECL))
10371 /* Like local_variable_p, but suitable for use as a tree-walking
10375 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10376 void *data ATTRIBUTE_UNUSED)
10378 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10380 else if (TYPE_P (*tp))
10381 *walk_subtrees = 0;
10387 /* Check that ARG, which is a default-argument expression for a
10388 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10389 something goes wrong. DECL may also be a _TYPE node, rather than a
10390 DECL, if there is no DECL available. */
10393 check_default_argument (tree decl, tree arg)
10398 if (TREE_CODE (arg) == DEFAULT_ARG)
10399 /* We get a DEFAULT_ARG when looking at an in-class declaration
10400 with a default argument. Ignore the argument for now; we'll
10401 deal with it after the class is complete. */
10410 decl_type = TREE_TYPE (decl);
10412 if (arg == error_mark_node
10413 || decl == error_mark_node
10414 || TREE_TYPE (arg) == error_mark_node
10415 || decl_type == error_mark_node)
10416 /* Something already went wrong. There's no need to check
10418 return error_mark_node;
10420 /* [dcl.fct.default]
10422 A default argument expression is implicitly converted to the
10424 if (!TREE_TYPE (arg)
10425 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10428 error ("default argument for %q#D has type %qT",
10429 decl, TREE_TYPE (arg));
10431 error ("default argument for parameter of type %qT has type %qT",
10432 decl_type, TREE_TYPE (arg));
10434 return error_mark_node;
10437 /* [dcl.fct.default]
10439 Local variables shall not be used in default argument
10442 The keyword `this' shall not be used in a default argument of a
10443 member function. */
10444 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10447 error ("default argument %qE uses local variable %qD", arg, var);
10448 return error_mark_node;
10455 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10458 type_is_deprecated (tree type)
10460 enum tree_code code;
10461 if (TREE_DEPRECATED (type))
10463 if (TYPE_NAME (type)
10464 && TREE_DEPRECATED (TYPE_NAME (type)))
10467 /* Do warn about using typedefs to a deprecated class. */
10468 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10469 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10471 code = TREE_CODE (type);
10473 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10474 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10475 || code == METHOD_TYPE || code == ARRAY_TYPE)
10476 return type_is_deprecated (TREE_TYPE (type));
10478 if (TYPE_PTRMEMFUNC_P (type))
10479 return type_is_deprecated
10480 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10485 /* Decode the list of parameter types for a function type.
10486 Given the list of things declared inside the parens,
10487 return a list of types.
10489 If this parameter does not end with an ellipsis, we append
10492 *PARMS is set to the chain of PARM_DECLs created. */
10495 grokparms (tree parmlist, tree *parms)
10497 tree result = NULL_TREE;
10498 tree decls = NULL_TREE;
10502 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10504 tree type = NULL_TREE;
10505 tree init = TREE_PURPOSE (parm);
10506 tree decl = TREE_VALUE (parm);
10507 const char *errmsg;
10509 if (parm == void_list_node)
10512 if (! decl || TREE_TYPE (decl) == error_mark_node)
10515 type = TREE_TYPE (decl);
10516 if (VOID_TYPE_P (type))
10518 if (same_type_p (type, void_type_node)
10519 && DECL_SELF_REFERENCE_P (type)
10520 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10521 /* this is a parmlist of `(void)', which is ok. */
10523 cxx_incomplete_type_error (decl, type);
10524 /* It's not a good idea to actually create parameters of
10525 type `void'; other parts of the compiler assume that a
10526 void type terminates the parameter list. */
10527 type = error_mark_node;
10528 TREE_TYPE (decl) = error_mark_node;
10531 if (type != error_mark_node
10532 && TYPE_FOR_JAVA (type)
10533 && MAYBE_CLASS_TYPE_P (type))
10535 error ("parameter %qD has Java class type", decl);
10536 type = error_mark_node;
10537 TREE_TYPE (decl) = error_mark_node;
10541 if (type != error_mark_node
10542 && (errmsg = targetm.invalid_parameter_type (type)))
10545 type = error_mark_node;
10546 TREE_TYPE (decl) = error_mark_node;
10549 if (type != error_mark_node)
10551 if (deprecated_state != DEPRECATED_SUPPRESS)
10553 tree deptype = type_is_deprecated (type);
10555 warn_deprecated_use (deptype, NULL_TREE);
10558 /* Top-level qualifiers on the parameters are
10559 ignored for function types. */
10560 type = cp_build_qualified_type (type, 0);
10561 if (TREE_CODE (type) == METHOD_TYPE)
10563 error ("parameter %qD invalidly declared method type", decl);
10564 type = build_pointer_type (type);
10565 TREE_TYPE (decl) = type;
10567 else if (abstract_virtuals_error (decl, type))
10568 any_error = 1; /* Seems like a good idea. */
10569 else if (POINTER_TYPE_P (type))
10571 /* [dcl.fct]/6, parameter types cannot contain pointers
10572 (references) to arrays of unknown bound. */
10573 tree t = TREE_TYPE (type);
10574 int ptr = TYPE_PTR_P (type);
10578 if (TYPE_PTR_P (t))
10580 else if (TREE_CODE (t) != ARRAY_TYPE)
10582 else if (!TYPE_DOMAIN (t))
10586 if (TREE_CODE (t) == ARRAY_TYPE)
10588 ? G_("parameter %qD includes pointer to array of "
10589 "unknown bound %qT")
10590 : G_("parameter %qD includes reference to array of "
10591 "unknown bound %qT"),
10597 else if (init && !processing_template_decl)
10598 init = check_default_argument (decl, init);
10601 DECL_CHAIN (decl) = decls;
10603 result = tree_cons (init, type, result);
10605 decls = nreverse (decls);
10606 result = nreverse (result);
10608 result = chainon (result, void_list_node);
10615 /* D is a constructor or overloaded `operator='.
10617 Let T be the class in which D is declared. Then, this function
10620 -1 if D's is an ill-formed constructor or copy assignment operator
10621 whose first parameter is of type `T'.
10622 0 if D is not a copy constructor or copy assignment
10624 1 if D is a copy constructor or copy assignment operator whose
10625 first parameter is a reference to non-const qualified T.
10626 2 if D is a copy constructor or copy assignment operator whose
10627 first parameter is a reference to const qualified T.
10629 This function can be used as a predicate. Positive values indicate
10630 a copy constructor and nonzero values indicate a copy assignment
10634 copy_fn_p (const_tree d)
10640 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10642 if (TREE_CODE (d) == TEMPLATE_DECL
10643 || (DECL_TEMPLATE_INFO (d)
10644 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10645 /* Instantiations of template member functions are never copy
10646 functions. Note that member functions of templated classes are
10647 represented as template functions internally, and we must
10648 accept those as copy functions. */
10651 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10655 arg_type = TREE_VALUE (args);
10656 if (arg_type == error_mark_node)
10659 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10661 /* Pass by value copy assignment operator. */
10664 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10665 && !TYPE_REF_IS_RVALUE (arg_type)
10666 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10668 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10674 args = TREE_CHAIN (args);
10676 if (args && args != void_list_node && !TREE_PURPOSE (args))
10677 /* There are more non-optional args. */
10683 /* D is a constructor or overloaded `operator='.
10685 Let T be the class in which D is declared. Then, this function
10686 returns true when D is a move constructor or move assignment
10687 operator, false otherwise. */
10690 move_fn_p (const_tree d)
10694 bool result = false;
10696 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10698 if (cxx_dialect == cxx98)
10699 /* There are no move constructors if we are in C++98 mode. */
10702 if (TREE_CODE (d) == TEMPLATE_DECL
10703 || (DECL_TEMPLATE_INFO (d)
10704 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10705 /* Instantiations of template member functions are never copy
10706 functions. Note that member functions of templated classes are
10707 represented as template functions internally, and we must
10708 accept those as copy functions. */
10711 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10715 arg_type = TREE_VALUE (args);
10716 if (arg_type == error_mark_node)
10719 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10720 && TYPE_REF_IS_RVALUE (arg_type)
10721 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10725 args = TREE_CHAIN (args);
10727 if (args && args != void_list_node && !TREE_PURPOSE (args))
10728 /* There are more non-optional args. */
10734 /* Remember any special properties of member function DECL. */
10737 grok_special_member_properties (tree decl)
10741 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10744 class_type = DECL_CONTEXT (decl);
10745 if (DECL_CONSTRUCTOR_P (decl))
10747 int ctor = copy_fn_p (decl);
10749 if (!DECL_ARTIFICIAL (decl))
10750 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10756 A non-template constructor for class X is a copy
10757 constructor if its first parameter is of type X&, const
10758 X&, volatile X& or const volatile X&, and either there
10759 are no other parameters or else all other parameters have
10760 default arguments. */
10761 TYPE_HAS_COPY_CTOR (class_type) = 1;
10762 if (user_provided_p (decl))
10763 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10765 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10767 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10769 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10770 if (user_provided_p (decl))
10771 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10773 else if (move_fn_p (decl) && user_provided_p (decl))
10774 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10775 else if (is_list_ctor (decl))
10776 TYPE_HAS_LIST_CTOR (class_type) = 1;
10778 if (DECL_DECLARED_CONSTEXPR_P (decl)
10779 && !copy_fn_p (decl) && !move_fn_p (decl))
10780 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10782 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10786 A non-template assignment operator for class X is a copy
10787 assignment operator if its parameter is of type X, X&, const
10788 X&, volatile X& or const volatile X&. */
10790 int assop = copy_fn_p (decl);
10794 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10795 if (user_provided_p (decl))
10796 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10798 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10800 else if (move_fn_p (decl) && user_provided_p (decl))
10801 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10803 /* Destructors are handled in check_methods. */
10806 /* Check a constructor DECL has the correct form. Complains
10807 if the class has a constructor of the form X(X). */
10810 grok_ctor_properties (const_tree ctype, const_tree decl)
10812 int ctor_parm = copy_fn_p (decl);
10818 A declaration of a constructor for a class X is ill-formed if
10819 its first parameter is of type (optionally cv-qualified) X
10820 and either there are no other parameters or else all other
10821 parameters have default arguments.
10823 We *don't* complain about member template instantiations that
10824 have this form, though; they can occur as we try to decide
10825 what constructor to use during overload resolution. Since
10826 overload resolution will never prefer such a constructor to
10827 the non-template copy constructor (which is either explicitly
10828 or implicitly defined), there's no need to worry about their
10829 existence. Theoretically, they should never even be
10830 instantiated, but that's hard to forestall. */
10831 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10839 /* An operator with this code is unary, but can also be binary. */
10842 ambi_op_p (enum tree_code code)
10844 return (code == INDIRECT_REF
10845 || code == ADDR_EXPR
10846 || code == UNARY_PLUS_EXPR
10847 || code == NEGATE_EXPR
10848 || code == PREINCREMENT_EXPR
10849 || code == PREDECREMENT_EXPR);
10852 /* An operator with this name can only be unary. */
10855 unary_op_p (enum tree_code code)
10857 return (code == TRUTH_NOT_EXPR
10858 || code == BIT_NOT_EXPR
10859 || code == COMPONENT_REF
10860 || code == TYPE_EXPR);
10863 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10864 errors are issued for invalid declarations. */
10867 grok_op_properties (tree decl, bool complain)
10869 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10871 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10872 tree name = DECL_NAME (decl);
10873 enum tree_code operator_code;
10878 /* Count the number of arguments and check for ellipsis. */
10879 for (argtype = argtypes, arity = 0;
10880 argtype && argtype != void_list_node;
10881 argtype = TREE_CHAIN (argtype))
10883 ellipsis_p = !argtype;
10885 class_type = DECL_CONTEXT (decl);
10886 if (class_type && !CLASS_TYPE_P (class_type))
10887 class_type = NULL_TREE;
10889 if (DECL_CONV_FN_P (decl))
10890 operator_code = TYPE_EXPR;
10894 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10895 if (ansi_opname (CODE) == name) \
10897 operator_code = (CODE); \
10900 else if (ansi_assopname (CODE) == name) \
10902 operator_code = (CODE); \
10903 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10907 #include "operators.def"
10908 #undef DEF_OPERATOR
10910 gcc_unreachable ();
10913 gcc_assert (operator_code != MAX_TREE_CODES);
10914 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10917 switch (operator_code)
10920 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10924 TYPE_GETS_DELETE (class_type) |= 1;
10928 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10931 case VEC_DELETE_EXPR:
10932 TYPE_GETS_DELETE (class_type) |= 2;
10939 /* [basic.std.dynamic.allocation]/1:
10941 A program is ill-formed if an allocation function is declared
10942 in a namespace scope other than global scope or declared static
10945 The same also holds true for deallocation functions. */
10946 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10947 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10949 if (DECL_NAMESPACE_SCOPE_P (decl))
10951 if (CP_DECL_CONTEXT (decl) != global_namespace)
10953 error ("%qD may not be declared within a namespace", decl);
10956 else if (!TREE_PUBLIC (decl))
10958 error ("%qD may not be declared as static", decl);
10964 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10966 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10967 DECL_IS_OPERATOR_NEW (decl) = 1;
10969 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10970 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10973 /* An operator function must either be a non-static member function
10974 or have at least one parameter of a class, a reference to a class,
10975 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10976 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10978 if (operator_code == TYPE_EXPR
10979 || operator_code == CALL_EXPR
10980 || operator_code == COMPONENT_REF
10981 || operator_code == ARRAY_REF
10982 || operator_code == NOP_EXPR)
10984 error ("%qD must be a nonstatic member function", decl);
10991 if (DECL_STATIC_FUNCTION_P (decl))
10993 error ("%qD must be either a non-static member "
10994 "function or a non-member function", decl);
10998 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11000 tree arg = non_reference (TREE_VALUE (p));
11001 if (arg == error_mark_node)
11004 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11005 because these checks are performed even on
11006 template functions. */
11007 if (MAYBE_CLASS_TYPE_P (arg)
11008 || TREE_CODE (arg) == ENUMERAL_TYPE)
11012 if (!p || p == void_list_node)
11015 error ("%qD must have an argument of class or "
11016 "enumerated type", decl);
11022 /* There are no restrictions on the arguments to an overloaded
11024 if (operator_code == CALL_EXPR)
11027 /* Warn about conversion operators that will never be used. */
11028 if (IDENTIFIER_TYPENAME_P (name)
11029 && ! DECL_TEMPLATE_INFO (decl)
11031 /* Warn only declaring the function; there is no need to
11032 warn again about out-of-class definitions. */
11033 && class_type == current_class_type)
11035 tree t = TREE_TYPE (name);
11036 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11039 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11041 if (TREE_CODE (t) == VOID_TYPE)
11042 warning (OPT_Wconversion,
11044 ? G_("conversion to a reference to void "
11045 "will never use a type conversion operator")
11046 : G_("conversion to void "
11047 "will never use a type conversion operator"));
11048 else if (class_type)
11050 if (t == class_type)
11051 warning (OPT_Wconversion,
11053 ? G_("conversion to a reference to the same type "
11054 "will never use a type conversion operator")
11055 : G_("conversion to the same type "
11056 "will never use a type conversion operator"));
11057 /* Don't force t to be complete here. */
11058 else if (MAYBE_CLASS_TYPE_P (t)
11059 && COMPLETE_TYPE_P (t)
11060 && DERIVED_FROM_P (t, class_type))
11061 warning (OPT_Wconversion,
11063 ? G_("conversion to a reference to a base class "
11064 "will never use a type conversion operator")
11065 : G_("conversion to a base class "
11066 "will never use a type conversion operator"));
11071 if (operator_code == COND_EXPR)
11074 error ("ISO C++ prohibits overloading operator ?:");
11077 else if (ellipsis_p)
11079 error ("%qD must not have variable number of arguments", decl);
11082 else if (ambi_op_p (operator_code))
11085 /* We pick the one-argument operator codes by default, so
11086 we don't have to change anything. */
11088 else if (arity == 2)
11090 /* If we thought this was a unary operator, we now know
11091 it to be a binary operator. */
11092 switch (operator_code)
11095 operator_code = MULT_EXPR;
11099 operator_code = BIT_AND_EXPR;
11102 case UNARY_PLUS_EXPR:
11103 operator_code = PLUS_EXPR;
11107 operator_code = MINUS_EXPR;
11110 case PREINCREMENT_EXPR:
11111 operator_code = POSTINCREMENT_EXPR;
11114 case PREDECREMENT_EXPR:
11115 operator_code = POSTDECREMENT_EXPR;
11119 gcc_unreachable ();
11122 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11124 if ((operator_code == POSTINCREMENT_EXPR
11125 || operator_code == POSTDECREMENT_EXPR)
11126 && ! processing_template_decl
11127 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11130 error ("postfix %qD must take %<int%> as its argument",
11133 error ("postfix %qD must take %<int%> as its second "
11141 error ("%qD must take either zero or one argument", decl);
11143 error ("%qD must take either one or two arguments", decl);
11147 /* More Effective C++ rule 6. */
11149 && (operator_code == POSTINCREMENT_EXPR
11150 || operator_code == POSTDECREMENT_EXPR
11151 || operator_code == PREINCREMENT_EXPR
11152 || operator_code == PREDECREMENT_EXPR))
11154 tree arg = TREE_VALUE (argtypes);
11155 tree ret = TREE_TYPE (TREE_TYPE (decl));
11156 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11157 arg = TREE_TYPE (arg);
11158 arg = TYPE_MAIN_VARIANT (arg);
11159 if (operator_code == PREINCREMENT_EXPR
11160 || operator_code == PREDECREMENT_EXPR)
11162 if (TREE_CODE (ret) != REFERENCE_TYPE
11163 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11165 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11166 build_reference_type (arg));
11170 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11171 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11175 else if (unary_op_p (operator_code))
11180 error ("%qD must take %<void%>", decl);
11182 error ("%qD must take exactly one argument", decl);
11186 else /* if (binary_op_p (operator_code)) */
11191 error ("%qD must take exactly one argument", decl);
11193 error ("%qD must take exactly two arguments", decl);
11197 /* More Effective C++ rule 7. */
11199 && (operator_code == TRUTH_ANDIF_EXPR
11200 || operator_code == TRUTH_ORIF_EXPR
11201 || operator_code == COMPOUND_EXPR))
11202 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11206 /* Effective C++ rule 23. */
11209 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11210 && (operator_code == PLUS_EXPR
11211 || operator_code == MINUS_EXPR
11212 || operator_code == TRUNC_DIV_EXPR
11213 || operator_code == MULT_EXPR
11214 || operator_code == TRUNC_MOD_EXPR)
11215 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11216 warning (OPT_Weffc__, "%qD should return by value", decl);
11218 /* [over.oper]/8 */
11219 for (; argtypes && argtypes != void_list_node;
11220 argtypes = TREE_CHAIN (argtypes))
11221 if (TREE_PURPOSE (argtypes))
11223 TREE_PURPOSE (argtypes) = NULL_TREE;
11224 if (operator_code == POSTINCREMENT_EXPR
11225 || operator_code == POSTDECREMENT_EXPR)
11227 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11232 error ("%qD cannot have default arguments", decl);
11240 /* Return a string giving the keyword associate with CODE. */
11242 static const char *
11243 tag_name (enum tag_types code)
11255 case typename_type:
11258 gcc_unreachable ();
11262 /* Name lookup in an elaborated-type-specifier (after the keyword
11263 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11264 elaborated-type-specifier is invalid, issue a diagnostic and return
11265 error_mark_node; otherwise, return the *_TYPE to which it referred.
11266 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11269 check_elaborated_type_specifier (enum tag_types tag_code,
11271 bool allow_template_p)
11277 struct S { struct S *p; };
11279 name lookup will find the TYPE_DECL for the implicit "S::S"
11280 typedef. Adjust for that here. */
11281 if (DECL_SELF_REFERENCE_P (decl))
11282 decl = TYPE_NAME (TREE_TYPE (decl));
11284 type = TREE_TYPE (decl);
11286 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11287 is false for this case as well. */
11288 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11290 error ("using template type parameter %qT after %qs",
11291 type, tag_name (tag_code));
11292 return error_mark_node;
11296 If the identifier resolves to a typedef-name or a template
11297 type-parameter, the elaborated-type-specifier is ill-formed.
11299 In other words, the only legitimate declaration to use in the
11300 elaborated type specifier is the implicit typedef created when
11301 the type is declared. */
11302 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11303 && !DECL_SELF_REFERENCE_P (decl)
11304 && tag_code != typename_type)
11306 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11307 error ("%q+D has a previous declaration here", decl);
11308 return error_mark_node;
11310 else if (TREE_CODE (type) != RECORD_TYPE
11311 && TREE_CODE (type) != UNION_TYPE
11312 && tag_code != enum_type
11313 && tag_code != typename_type)
11315 error ("%qT referred to as %qs", type, tag_name (tag_code));
11316 error ("%q+T has a previous declaration here", type);
11317 return error_mark_node;
11319 else if (TREE_CODE (type) != ENUMERAL_TYPE
11320 && tag_code == enum_type)
11322 error ("%qT referred to as enum", type);
11323 error ("%q+T has a previous declaration here", type);
11324 return error_mark_node;
11326 else if (!allow_template_p
11327 && TREE_CODE (type) == RECORD_TYPE
11328 && CLASSTYPE_IS_TEMPLATE (type))
11330 /* If a class template appears as elaborated type specifier
11331 without a template header such as:
11333 template <class T> class C {};
11334 void f(class C); // No template header here
11336 then the required template argument is missing. */
11337 error ("template argument required for %<%s %T%>",
11338 tag_name (tag_code),
11339 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11340 return error_mark_node;
11346 /* Lookup NAME in elaborate type specifier in scope according to
11347 SCOPE and issue diagnostics if necessary.
11348 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11349 found, and ERROR_MARK_NODE for type error. */
11352 lookup_and_check_tag (enum tag_types tag_code, tree name,
11353 tag_scope scope, bool template_header_p)
11357 if (scope == ts_global)
11359 /* First try ordinary name lookup, ignoring hidden class name
11360 injected via friend declaration. */
11361 decl = lookup_name_prefer_type (name, 2);
11362 /* If that fails, the name will be placed in the smallest
11363 non-class, non-function-prototype scope according to 3.3.1/5.
11364 We may already have a hidden name declared as friend in this
11365 scope. So lookup again but not ignoring hidden names.
11366 If we find one, that name will be made visible rather than
11367 creating a new tag. */
11369 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11372 decl = lookup_type_scope (name, scope);
11374 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11375 decl = DECL_TEMPLATE_RESULT (decl);
11377 if (decl && TREE_CODE (decl) == TYPE_DECL)
11379 /* Look for invalid nested type:
11383 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11385 error ("%qD has the same name as the class in which it is "
11388 return error_mark_node;
11391 /* Two cases we need to consider when deciding if a class
11392 template is allowed as an elaborated type specifier:
11393 1. It is a self reference to its own class.
11394 2. It comes with a template header.
11398 template <class T> class C {
11399 class C *c1; // DECL_SELF_REFERENCE_P is true
11402 template <class U> class C; // template_header_p is true
11403 template <class T> class C<T>::D {
11404 class C *c2; // DECL_SELF_REFERENCE_P is true
11407 t = check_elaborated_type_specifier (tag_code,
11410 | DECL_SELF_REFERENCE_P (decl));
11413 else if (decl && TREE_CODE (decl) == TREE_LIST)
11415 error ("reference to %qD is ambiguous", name);
11416 print_candidates (decl);
11417 return error_mark_node;
11423 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11424 Define the tag as a forward-reference if it is not defined.
11426 If a declaration is given, process it here, and report an error if
11427 multiple declarations are not identical.
11429 SCOPE is TS_CURRENT when this is also a definition. Only look in
11430 the current frame for the name (since C++ allows new names in any
11431 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11432 declaration. Only look beginning from the current scope outward up
11433 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11435 TEMPLATE_HEADER_P is true when this declaration is preceded by
11436 a set of template parameters. */
11439 xref_tag_1 (enum tag_types tag_code, tree name,
11440 tag_scope scope, bool template_header_p)
11442 enum tree_code code;
11444 tree context = NULL_TREE;
11446 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11452 code = RECORD_TYPE;
11458 code = ENUMERAL_TYPE;
11461 gcc_unreachable ();
11464 /* In case of anonymous name, xref_tag is only called to
11465 make type node and push name. Name lookup is not required. */
11466 if (ANON_AGGRNAME_P (name))
11469 t = lookup_and_check_tag (tag_code, name,
11470 scope, template_header_p);
11472 if (t == error_mark_node)
11473 return error_mark_node;
11475 if (scope != ts_current && t && current_class_type
11476 && template_class_depth (current_class_type)
11477 && template_header_p)
11479 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11480 definition of this tag. Since, in addition, we are currently
11481 processing a (member) template declaration of a template
11482 class, we must be very careful; consider:
11489 { template <class V>
11490 friend struct S1; };
11492 Here, the S2::S1 declaration should not be confused with the
11493 outer declaration. In particular, the inner version should
11494 have a template parameter of level 2, not level 1. This
11495 would be particularly important if the member declaration
11498 template <class V = U> friend struct S1;
11500 say, when we should tsubst into `U' when instantiating
11501 S2. On the other hand, when presented with:
11511 we must find the inner binding eventually. We
11512 accomplish this by making sure that the new type we
11513 create to represent this declaration has the right
11515 context = TYPE_CONTEXT (t);
11521 /* If no such tag is yet defined, create a forward-reference node
11522 and record it as the "definition".
11523 When a real declaration of this type is found,
11524 the forward-reference will be altered into a real type. */
11525 if (code == ENUMERAL_TYPE)
11527 error ("use of enum %q#D without previous declaration", name);
11528 return error_mark_node;
11532 t = make_class_type (code);
11533 TYPE_CONTEXT (t) = context;
11534 t = pushtag (name, t, scope);
11539 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11541 if (!redeclare_class_template (t, current_template_parms))
11542 return error_mark_node;
11544 else if (!processing_template_decl
11545 && CLASS_TYPE_P (t)
11546 && CLASSTYPE_IS_TEMPLATE (t))
11548 error ("redeclaration of %qT as a non-template", t);
11549 error ("previous declaration %q+D", t);
11550 return error_mark_node;
11553 /* Make injected friend class visible. */
11554 if (scope != ts_within_enclosing_non_class
11555 && hidden_name_p (TYPE_NAME (t)))
11557 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11558 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11560 if (TYPE_TEMPLATE_INFO (t))
11562 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11563 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11571 /* Wrapper for xref_tag_1. */
11574 xref_tag (enum tag_types tag_code, tree name,
11575 tag_scope scope, bool template_header_p)
11579 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11580 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11581 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11587 xref_tag_from_type (tree old, tree id, tag_scope scope)
11589 enum tag_types tag_kind;
11591 if (TREE_CODE (old) == RECORD_TYPE)
11592 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11594 tag_kind = union_type;
11596 if (id == NULL_TREE)
11597 id = TYPE_IDENTIFIER (old);
11599 return xref_tag (tag_kind, id, scope, false);
11602 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11603 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11604 access_* node, and the TREE_VALUE is the type of the base-class.
11605 Non-NULL TREE_TYPE indicates virtual inheritance.
11607 Returns true if the binfo hierarchy was successfully created,
11608 false if an error was detected. */
11611 xref_basetypes (tree ref, tree base_list)
11614 tree binfo, base_binfo;
11615 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11616 unsigned max_bases = 0; /* Maximum direct bases. */
11618 tree default_access;
11619 tree igo_prev; /* Track Inheritance Graph Order. */
11621 if (ref == error_mark_node)
11624 /* The base of a derived class is private by default, all others are
11626 default_access = (TREE_CODE (ref) == RECORD_TYPE
11627 && CLASSTYPE_DECLARED_CLASS (ref)
11628 ? access_private_node : access_public_node);
11630 /* First, make sure that any templates in base-classes are
11631 instantiated. This ensures that if we call ourselves recursively
11632 we do not get confused about which classes are marked and which
11634 basep = &base_list;
11637 tree basetype = TREE_VALUE (*basep);
11639 if (!(processing_template_decl && uses_template_parms (basetype))
11640 && !complete_type_or_else (basetype, NULL))
11641 /* An incomplete type. Remove it from the list. */
11642 *basep = TREE_CHAIN (*basep);
11646 if (TREE_TYPE (*basep))
11648 if (CLASS_TYPE_P (basetype))
11649 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11650 basep = &TREE_CHAIN (*basep);
11654 TYPE_MARKED_P (ref) = 1;
11656 /* The binfo slot should be empty, unless this is an (ill-formed)
11658 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11660 error ("redefinition of %q#T", ref);
11664 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11666 binfo = make_tree_binfo (max_bases);
11668 TYPE_BINFO (ref) = binfo;
11669 BINFO_OFFSET (binfo) = size_zero_node;
11670 BINFO_TYPE (binfo) = ref;
11672 /* Apply base-class info set up to the variants of this type. */
11673 fixup_type_variants (ref);
11677 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11678 /* An aggregate cannot have baseclasses. */
11679 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11681 if (TREE_CODE (ref) == UNION_TYPE)
11683 error ("derived union %qT invalid", ref);
11690 if (TYPE_FOR_JAVA (ref))
11692 error ("Java class %qT cannot have multiple bases", ref);
11699 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11701 if (TYPE_FOR_JAVA (ref))
11703 error ("Java class %qT cannot have virtual bases", ref);
11708 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11710 tree access = TREE_PURPOSE (base_list);
11711 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11712 tree basetype = TREE_VALUE (base_list);
11714 if (access == access_default_node)
11715 access = default_access;
11717 if (PACK_EXPANSION_P (basetype))
11718 basetype = PACK_EXPANSION_PATTERN (basetype);
11719 if (TREE_CODE (basetype) == TYPE_DECL)
11720 basetype = TREE_TYPE (basetype);
11721 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11723 error ("base type %qT fails to be a struct or class type",
11728 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11729 TYPE_FOR_JAVA (ref) = 1;
11731 base_binfo = NULL_TREE;
11732 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11734 base_binfo = TYPE_BINFO (basetype);
11735 /* The original basetype could have been a typedef'd type. */
11736 basetype = BINFO_TYPE (base_binfo);
11738 /* Inherit flags from the base. */
11739 TYPE_HAS_NEW_OPERATOR (ref)
11740 |= TYPE_HAS_NEW_OPERATOR (basetype);
11741 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11742 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11743 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11744 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11745 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11746 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11747 CLASSTYPE_REPEATED_BASE_P (ref)
11748 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11751 /* We must do this test after we've seen through a typedef
11753 if (TYPE_MARKED_P (basetype))
11755 if (basetype == ref)
11756 error ("recursive type %qT undefined", basetype);
11758 error ("duplicate base type %qT invalid", basetype);
11762 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11763 /* Regenerate the pack expansion for the bases. */
11764 basetype = make_pack_expansion (basetype);
11766 TYPE_MARKED_P (basetype) = 1;
11768 base_binfo = copy_binfo (base_binfo, basetype, ref,
11769 &igo_prev, via_virtual);
11770 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11771 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11773 BINFO_BASE_APPEND (binfo, base_binfo);
11774 BINFO_BASE_ACCESS_APPEND (binfo, access);
11777 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11778 /* If we have space in the vbase vector, we must have shared at
11779 least one of them, and are therefore diamond shaped. */
11780 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11782 /* Unmark all the types. */
11783 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11784 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11785 TYPE_MARKED_P (ref) = 0;
11787 /* Now see if we have a repeated base type. */
11788 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11790 for (base_binfo = binfo; base_binfo;
11791 base_binfo = TREE_CHAIN (base_binfo))
11793 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11795 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11798 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11800 for (base_binfo = binfo; base_binfo;
11801 base_binfo = TREE_CHAIN (base_binfo))
11802 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11803 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11812 /* Copies the enum-related properties from type SRC to type DST.
11813 Used with the underlying type of an enum and the enum itself. */
11815 copy_type_enum (tree dst, tree src)
11817 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11818 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11819 TYPE_SIZE (dst) = TYPE_SIZE (src);
11820 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11821 SET_TYPE_MODE (dst, TYPE_MODE (src));
11822 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11823 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11824 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11825 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11828 /* Begin compiling the definition of an enumeration type.
11831 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11833 UNDERLYING_TYPE is the type that will be used as the storage for
11834 the enumeration type. This should be NULL_TREE if no storage type
11837 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11839 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11841 Returns the type object, as yet incomplete.
11842 Also records info about it so that build_enumerator
11843 may be used to declare the individual values as they are read. */
11846 start_enum (tree name, tree enumtype, tree underlying_type,
11847 bool scoped_enum_p, bool *is_new)
11849 tree prevtype = NULL_TREE;
11850 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11854 /* [C++0x dcl.enum]p5:
11856 If not explicitly specified, the underlying type of a scoped
11857 enumeration type is int. */
11858 if (!underlying_type && scoped_enum_p)
11859 underlying_type = integer_type_node;
11861 if (underlying_type)
11862 underlying_type = cv_unqualified (underlying_type);
11864 /* If this is the real definition for a previous forward reference,
11865 fill in the contents in the same object that used to be the
11866 forward reference. */
11868 enumtype = lookup_and_check_tag (enum_type, name,
11869 /*tag_scope=*/ts_current,
11870 /*template_header_p=*/false);
11872 /* In case of a template_decl, the only check that should be deferred
11873 to instantiation time is the comparison of underlying types. */
11874 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11876 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11878 error_at (input_location, "scoped/unscoped mismatch "
11879 "in enum %q#T", enumtype);
11880 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11881 "previous definition here");
11882 enumtype = error_mark_node;
11884 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11886 error_at (input_location, "underlying type mismatch "
11887 "in enum %q#T", enumtype);
11888 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11889 "previous definition here");
11890 enumtype = error_mark_node;
11892 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11893 && !dependent_type_p (underlying_type)
11894 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11895 && !same_type_p (underlying_type,
11896 ENUM_UNDERLYING_TYPE (enumtype)))
11898 error_at (input_location, "different underlying type "
11899 "in enum %q#T", enumtype);
11900 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11901 "previous definition here");
11902 underlying_type = NULL_TREE;
11906 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11907 || processing_template_decl)
11909 /* In case of error, make a dummy enum to allow parsing to
11911 if (enumtype == error_mark_node)
11913 name = make_anon_name ();
11914 enumtype = NULL_TREE;
11917 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11918 of an opaque enum, or an opaque enum of an already defined
11919 enumeration (C++0x only).
11920 In any other case, it'll be NULL_TREE. */
11926 prevtype = enumtype;
11927 enumtype = cxx_make_type (ENUMERAL_TYPE);
11928 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11929 if (enumtype == error_mark_node)
11930 return error_mark_node;
11932 /* The enum is considered opaque until the opening '{' of the
11933 enumerator list. */
11934 SET_OPAQUE_ENUM_P (enumtype, true);
11935 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11938 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11940 if (underlying_type)
11942 if (CP_INTEGRAL_TYPE_P (underlying_type))
11944 copy_type_enum (enumtype, underlying_type);
11945 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11947 else if (dependent_type_p (underlying_type))
11948 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11950 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11951 underlying_type, enumtype);
11954 /* If into a template class, the returned enum is always the first
11955 declaration (opaque or not) seen. This way all the references to
11956 this type will be to the same declaration. The following ones are used
11957 only to check for definition errors. */
11958 if (prevtype && processing_template_decl)
11964 /* After processing and defining all the values of an enumeration type,
11965 install their decls in the enumeration type.
11966 ENUMTYPE is the type object. */
11969 finish_enum_value_list (tree enumtype)
11972 tree underlying_type;
11975 tree minnode, maxnode;
11978 bool fixed_underlying_type_p
11979 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11981 /* We built up the VALUES in reverse order. */
11982 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11984 /* For an enum defined in a template, just set the type of the values;
11985 all further processing is postponed until the template is
11986 instantiated. We need to set the type so that tsubst of a CONST_DECL
11988 if (processing_template_decl)
11990 for (values = TYPE_VALUES (enumtype);
11992 values = TREE_CHAIN (values))
11993 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11997 /* Determine the minimum and maximum values of the enumerators. */
11998 if (TYPE_VALUES (enumtype))
12000 minnode = maxnode = NULL_TREE;
12002 for (values = TYPE_VALUES (enumtype);
12004 values = TREE_CHAIN (values))
12006 decl = TREE_VALUE (values);
12008 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12009 each enumerator has the type of its enumeration. Prior to the
12010 closing brace, the type of each enumerator is the type of its
12011 initializing value. */
12012 TREE_TYPE (decl) = enumtype;
12014 /* Update the minimum and maximum values, if appropriate. */
12015 value = DECL_INITIAL (decl);
12016 if (value == error_mark_node)
12017 value = integer_zero_node;
12018 /* Figure out what the minimum and maximum values of the
12019 enumerators are. */
12021 minnode = maxnode = value;
12022 else if (tree_int_cst_lt (maxnode, value))
12024 else if (tree_int_cst_lt (value, minnode))
12031 If the enumerator-list is empty, the underlying type is as if
12032 the enumeration had a single enumerator with value 0. */
12033 minnode = maxnode = integer_zero_node;
12035 if (!fixed_underlying_type_p)
12037 /* Compute the number of bits require to represent all values of the
12038 enumeration. We must do this before the type of MINNODE and
12039 MAXNODE are transformed, since tree_int_cst_min_precision relies
12040 on the TREE_TYPE of the value it is passed. */
12041 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12042 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12043 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12044 int precision = MAX (lowprec, highprec);
12046 bool use_short_enum;
12048 /* Determine the underlying type of the enumeration.
12052 The underlying type of an enumeration is an integral type that
12053 can represent all the enumerator values defined in the
12054 enumeration. It is implementation-defined which integral type is
12055 used as the underlying type for an enumeration except that the
12056 underlying type shall not be larger than int unless the value of
12057 an enumerator cannot fit in an int or unsigned int.
12059 We use "int" or an "unsigned int" as the underlying type, even if
12060 a smaller integral type would work, unless the user has
12061 explicitly requested that we use the smallest possible type. The
12062 user can request that for all enumerations with a command line
12063 flag, or for just one enumeration with an attribute. */
12065 use_short_enum = flag_short_enums
12066 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12068 for (itk = (use_short_enum ? itk_char : itk_int);
12072 underlying_type = integer_types[itk];
12073 if (underlying_type != NULL_TREE
12074 && TYPE_PRECISION (underlying_type) >= precision
12075 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12078 if (itk == itk_none)
12082 IF no integral type can represent all the enumerator values, the
12083 enumeration is ill-formed. */
12084 error ("no integral type can represent all of the enumerator values "
12085 "for %qT", enumtype);
12086 precision = TYPE_PRECISION (long_long_integer_type_node);
12087 underlying_type = integer_types[itk_unsigned_long_long];
12092 The value of sizeof() applied to an enumeration type, an object
12093 of an enumeration type, or an enumerator, is the value of sizeof()
12094 applied to the underlying type. */
12095 copy_type_enum (enumtype, underlying_type);
12097 /* Compute the minimum and maximum values for the type.
12101 For an enumeration where emin is the smallest enumerator and emax
12102 is the largest, the values of the enumeration are the values of the
12103 underlying type in the range bmin to bmax, where bmin and bmax are,
12104 respectively, the smallest and largest values of the smallest bit-
12105 field that can store emin and emax. */
12107 /* The middle-end currently assumes that types with TYPE_PRECISION
12108 narrower than their underlying type are suitably zero or sign
12109 extended to fill their mode. Similarly, it assumes that the front
12110 end assures that a value of a particular type must be within
12111 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12113 We used to set these fields based on bmin and bmax, but that led
12114 to invalid assumptions like optimizing away bounds checking. So
12115 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12116 TYPE_MAX_VALUE to the values for the mode above and only restrict
12117 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12118 ENUM_UNDERLYING_TYPE (enumtype)
12119 = build_distinct_type_copy (underlying_type);
12120 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12121 set_min_and_max_values_for_integral_type
12122 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12124 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12125 if (flag_strict_enums)
12126 set_min_and_max_values_for_integral_type (enumtype, precision,
12130 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12132 /* Convert each of the enumerators to the type of the underlying
12133 type of the enumeration. */
12134 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12136 location_t saved_location;
12138 decl = TREE_VALUE (values);
12139 saved_location = input_location;
12140 input_location = DECL_SOURCE_LOCATION (decl);
12141 if (fixed_underlying_type_p)
12142 /* If the enumeration type has a fixed underlying type, we
12143 already checked all of the enumerator values. */
12144 value = DECL_INITIAL (decl);
12146 value = perform_implicit_conversion (underlying_type,
12147 DECL_INITIAL (decl),
12148 tf_warning_or_error);
12149 input_location = saved_location;
12151 /* Do not clobber shared ints. */
12152 value = copy_node (value);
12154 TREE_TYPE (value) = enumtype;
12155 DECL_INITIAL (decl) = value;
12158 /* Fix up all variant types of this enum type. */
12159 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12160 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12162 /* Finish debugging output for this type. */
12163 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12166 /* Finishes the enum type. This is called only the first time an
12167 enumeration is seen, be it opaque or odinary.
12168 ENUMTYPE is the type object. */
12171 finish_enum (tree enumtype)
12173 if (processing_template_decl)
12175 if (at_function_scope_p ())
12176 add_stmt (build_min (TAG_DEFN, enumtype));
12180 /* Here there should not be any variants of this type. */
12181 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12182 && !TYPE_NEXT_VARIANT (enumtype));
12185 /* Build and install a CONST_DECL for an enumeration constant of the
12186 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12187 LOC is the location of NAME.
12188 Assignment of sequential values by default is handled here. */
12191 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12197 /* If the VALUE was erroneous, pretend it wasn't there; that will
12198 result in the enum being assigned the next value in sequence. */
12199 if (value == error_mark_node)
12202 /* Remove no-op casts from the value. */
12204 STRIP_TYPE_NOPS (value);
12206 if (! processing_template_decl)
12208 /* Validate and default VALUE. */
12209 if (value != NULL_TREE)
12211 value = cxx_constant_value (value);
12213 if (TREE_CODE (value) == INTEGER_CST
12214 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12216 value = perform_integral_promotions (value);
12220 error ("enumerator value for %qD is not an integer constant", name);
12225 /* Default based on previous value. */
12226 if (value == NULL_TREE)
12228 if (TYPE_VALUES (enumtype))
12231 unsigned HOST_WIDE_INT lo;
12235 /* C++03 7.2/4: If no initializer is specified for the first
12236 enumerator, the type is an unspecified integral
12237 type. Otherwise the type is the same as the type of the
12238 initializing value of the preceding enumerator unless the
12239 incremented value is not representable in that type, in
12240 which case the type is an unspecified integral type
12241 sufficient to contain the incremented value. */
12242 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12243 if (error_operand_p (prev_value))
12244 value = error_mark_node;
12247 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12248 TREE_INT_CST_HIGH (prev_value),
12253 tree type = TREE_TYPE (prev_value);
12254 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12255 di.low = lo; di.high = hi;
12256 if (!double_int_fits_to_tree_p (type, di))
12259 for (itk = itk_int; itk != itk_none; itk++)
12261 type = integer_types[itk];
12262 if (type != NULL_TREE
12263 && (pos || !TYPE_UNSIGNED (type))
12264 && double_int_fits_to_tree_p (type, di))
12267 if (type && cxx_dialect < cxx0x
12268 && itk > itk_unsigned_long)
12269 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12270 incremented enumerator value is too large for %<unsigned long%>" : "\
12271 incremented enumerator value is too large for %<long%>");
12273 if (type == NULL_TREE)
12276 value = double_int_to_tree (type, di);
12281 error ("overflow in enumeration values at %qD", name);
12282 value = error_mark_node;
12287 value = integer_zero_node;
12290 /* Remove no-op casts from the value. */
12291 STRIP_TYPE_NOPS (value);
12293 /* If the underlying type of the enum is fixed, check whether
12294 the enumerator values fits in the underlying type. If it
12295 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12296 if (ENUM_UNDERLYING_TYPE (enumtype)
12298 && TREE_CODE (value) == INTEGER_CST
12299 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12301 error ("enumerator value %E is too large for underlying type %<%T%>",
12302 value, ENUM_UNDERLYING_TYPE (enumtype));
12304 /* Silently convert the value so that we can continue. */
12305 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12310 /* C++ associates enums with global, function, or class declarations. */
12311 context = current_scope ();
12313 /* Build the actual enumeration constant. Note that the enumeration
12314 constants have the underlying type of the enum (if it is fixed)
12315 or the type of their initializer (if the underlying type of the
12316 enum is not fixed):
12320 If the underlying type is fixed, the type of each enumerator
12321 prior to the closing brace is the underlying type; if the
12322 initializing value of an enumerator cannot be represented by
12323 the underlying type, the program is ill-formed. If the
12324 underlying type is not fixed, the type of each enumerator is
12325 the type of its initializing value.
12327 If the underlying type is not fixed, it will be computed by
12328 finish_enum and we will reset the type of this enumerator. Of
12329 course, if we're processing a template, there may be no value. */
12330 type = value ? TREE_TYPE (value) : NULL_TREE;
12332 if (context && context == current_class_type)
12333 /* This enum declaration is local to the class. We need the full
12334 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12335 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12337 /* It's a global enum, or it's local to a function. (Note local to
12338 a function could mean local to a class method. */
12339 decl = build_decl (loc, CONST_DECL, name, type);
12341 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12342 TREE_CONSTANT (decl) = 1;
12343 TREE_READONLY (decl) = 1;
12344 DECL_INITIAL (decl) = value;
12346 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12347 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12348 on the TYPE_FIELDS list for `S'. (That's so that you can say
12349 things like `S::i' later.) */
12350 finish_member_declaration (decl);
12354 /* Add this enumeration constant to the list for this type. */
12355 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12358 /* Look for an enumerator with the given NAME within the enumeration
12359 type ENUMTYPE. This routine is used primarily for qualified name
12360 lookup into an enumerator in C++0x, e.g.,
12362 enum class Color { Red, Green, Blue };
12364 Color color = Color::Red;
12366 Returns the value corresponding to the enumerator, or
12367 NULL_TREE if no such enumerator was found. */
12369 lookup_enumerator (tree enumtype, tree name)
12372 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12374 e = purpose_member (name, TYPE_VALUES (enumtype));
12375 return e? TREE_VALUE (e) : NULL_TREE;
12379 /* We're defining DECL. Make sure that its type is OK. */
12382 check_function_type (tree decl, tree current_function_parms)
12384 tree fntype = TREE_TYPE (decl);
12385 tree return_type = complete_type (TREE_TYPE (fntype));
12387 /* In a function definition, arg types must be complete. */
12388 require_complete_types_for_parms (current_function_parms);
12390 if (dependent_type_p (return_type))
12392 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12393 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12395 tree args = TYPE_ARG_TYPES (fntype);
12397 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12398 error ("return type %q#T is incomplete", return_type);
12400 error ("return type has Java class type %q#T", return_type);
12402 /* Make it return void instead. */
12403 if (TREE_CODE (fntype) == METHOD_TYPE)
12404 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12406 TREE_CHAIN (args));
12408 fntype = build_function_type (void_type_node, args);
12410 = build_exception_variant (fntype,
12411 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12412 fntype = (cp_build_type_attribute_variant
12413 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12414 TREE_TYPE (decl) = fntype;
12417 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12420 /* Create the FUNCTION_DECL for a function definition.
12421 DECLSPECS and DECLARATOR are the parts of the declaration;
12422 they describe the function's name and the type it returns,
12423 but twisted together in a fashion that parallels the syntax of C.
12425 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12426 DECLARATOR is really the DECL for the function we are about to
12427 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12428 indicating that the function is an inline defined in-class.
12430 This function creates a binding context for the function body
12431 as well as setting up the FUNCTION_DECL in current_function_decl.
12433 For C++, we must first check whether that datum makes any sense.
12434 For example, "class A local_a(1,2);" means that variable local_a
12435 is an aggregate of type A, which should have a constructor
12436 applied to it with the argument list [1, 2].
12438 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12439 or may be a BLOCK if the function has been defined previously
12440 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12441 error_mark_node if the function has never been defined, or
12442 a BLOCK if the function has been defined somewhere. */
12445 start_preparsed_function (tree decl1, tree attrs, int flags)
12447 tree ctype = NULL_TREE;
12450 int doing_friend = 0;
12451 cp_binding_level *bl;
12452 tree current_function_parms;
12453 struct c_fileinfo *finfo
12454 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12455 bool honor_interface;
12457 /* Sanity check. */
12458 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12459 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12461 fntype = TREE_TYPE (decl1);
12462 if (TREE_CODE (fntype) == METHOD_TYPE)
12463 ctype = TYPE_METHOD_BASETYPE (fntype);
12465 /* ISO C++ 11.4/5. A friend function defined in a class is in
12466 the (lexical) scope of the class in which it is defined. */
12467 if (!ctype && DECL_FRIEND_P (decl1))
12469 ctype = DECL_FRIEND_CONTEXT (decl1);
12471 /* CTYPE could be null here if we're dealing with a template;
12472 for example, `inline friend float foo()' inside a template
12473 will have no CTYPE set. */
12474 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12480 if (DECL_DECLARED_INLINE_P (decl1)
12481 && lookup_attribute ("noinline", attrs))
12482 warning (0, "inline function %q+D given attribute noinline", decl1);
12484 /* Handle gnu_inline attribute. */
12485 if (GNU_INLINE_P (decl1))
12487 DECL_EXTERNAL (decl1) = 1;
12488 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12489 DECL_INTERFACE_KNOWN (decl1) = 1;
12490 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12493 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12494 /* This is a constructor, we must ensure that any default args
12495 introduced by this definition are propagated to the clones
12496 now. The clones are used directly in overload resolution. */
12497 adjust_clone_args (decl1);
12499 /* Sometimes we don't notice that a function is a static member, and
12500 build a METHOD_TYPE for it. Fix that up now. */
12501 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12502 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12504 /* Set up current_class_type, and enter the scope of the class, if
12507 push_nested_class (ctype);
12508 else if (DECL_STATIC_FUNCTION_P (decl1))
12509 push_nested_class (DECL_CONTEXT (decl1));
12511 /* Now that we have entered the scope of the class, we must restore
12512 the bindings for any template parameters surrounding DECL1, if it
12513 is an inline member template. (Order is important; consider the
12514 case where a template parameter has the same name as a field of
12515 the class.) It is not until after this point that
12516 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12517 if (flags & SF_INCLASS_INLINE)
12518 maybe_begin_member_template_processing (decl1);
12520 /* Effective C++ rule 15. */
12522 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12523 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12524 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12526 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12527 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12528 if (!DECL_INITIAL (decl1))
12529 DECL_INITIAL (decl1) = error_mark_node;
12531 /* This function exists in static storage.
12532 (This does not mean `static' in the C sense!) */
12533 TREE_STATIC (decl1) = 1;
12535 /* We must call push_template_decl after current_class_type is set
12536 up. (If we are processing inline definitions after exiting a
12537 class scope, current_class_type will be NULL_TREE until set above
12538 by push_nested_class.) */
12539 if (processing_template_decl)
12541 /* FIXME: Handle error_mark_node more gracefully. */
12542 tree newdecl1 = push_template_decl (decl1);
12543 if (newdecl1 != error_mark_node)
12547 /* We are now in the scope of the function being defined. */
12548 current_function_decl = decl1;
12550 /* Save the parm names or decls from this function's declarator
12551 where store_parm_decls will find them. */
12552 current_function_parms = DECL_ARGUMENTS (decl1);
12554 /* Make sure the parameter and return types are reasonable. When
12555 you declare a function, these types can be incomplete, but they
12556 must be complete when you define the function. */
12557 check_function_type (decl1, current_function_parms);
12559 /* Build the return declaration for the function. */
12560 restype = TREE_TYPE (fntype);
12561 if (DECL_RESULT (decl1) == NULL_TREE)
12565 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12566 DECL_ARTIFICIAL (resdecl) = 1;
12567 DECL_IGNORED_P (resdecl) = 1;
12568 DECL_RESULT (decl1) = resdecl;
12570 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12573 /* Let the user know we're compiling this function. */
12574 announce_function (decl1);
12576 /* Record the decl so that the function name is defined.
12577 If we already have a decl for this name, and it is a FUNCTION_DECL,
12578 use the old decl. */
12579 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12581 /* A specialization is not used to guide overload resolution. */
12582 if (!DECL_FUNCTION_MEMBER_P (decl1)
12583 && !(DECL_USE_TEMPLATE (decl1) &&
12584 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12586 tree olddecl = pushdecl (decl1);
12588 if (olddecl == error_mark_node)
12589 /* If something went wrong when registering the declaration,
12590 use DECL1; we have to have a FUNCTION_DECL to use when
12591 parsing the body of the function. */
12595 /* Otherwise, OLDDECL is either a previous declaration
12596 of the same function or DECL1 itself. */
12598 if (warn_missing_declarations
12599 && olddecl == decl1
12600 && !DECL_MAIN_P (decl1)
12601 && TREE_PUBLIC (decl1)
12602 && !DECL_DECLARED_INLINE_P (decl1))
12606 /* Check whether DECL1 is in an anonymous
12608 for (context = DECL_CONTEXT (decl1);
12610 context = DECL_CONTEXT (context))
12612 if (TREE_CODE (context) == NAMESPACE_DECL
12613 && DECL_NAME (context) == NULL_TREE)
12617 if (context == NULL)
12618 warning (OPT_Wmissing_declarations,
12619 "no previous declaration for %q+D", decl1);
12627 /* We need to set the DECL_CONTEXT. */
12628 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12629 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12631 fntype = TREE_TYPE (decl1);
12633 /* If #pragma weak applies, mark the decl appropriately now.
12634 The pragma only applies to global functions. Because
12635 determining whether or not the #pragma applies involves
12636 computing the mangled name for the declaration, we cannot
12637 apply the pragma until after we have merged this declaration
12638 with any previous declarations; if the original declaration
12639 has a linkage specification, that specification applies to
12640 the definition as well, and may affect the mangled name. */
12641 if (DECL_FILE_SCOPE_P (decl1))
12642 maybe_apply_pragma_weak (decl1);
12645 /* Reset this in case the call to pushdecl changed it. */
12646 current_function_decl = decl1;
12648 gcc_assert (DECL_INITIAL (decl1));
12650 /* This function may already have been parsed, in which case just
12651 return; our caller will skip over the body without parsing. */
12652 if (DECL_INITIAL (decl1) != error_mark_node)
12655 /* Initialize RTL machinery. We cannot do this until
12656 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12657 even when processing a template; this is how we get
12658 CFUN set up, and our per-function variables initialized.
12659 FIXME factor out the non-RTL stuff. */
12660 bl = current_binding_level;
12661 allocate_struct_function (decl1, processing_template_decl);
12663 /* Initialize the language data structures. Whenever we start
12664 a new function, we destroy temporaries in the usual way. */
12665 cfun->language = ggc_alloc_cleared_language_function ();
12666 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12667 current_binding_level = bl;
12669 /* Start the statement-tree, start the tree now. */
12670 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12672 /* If we are (erroneously) defining a function that we have already
12673 defined before, wipe out what we knew before. */
12674 if (!DECL_PENDING_INLINE_P (decl1))
12675 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12677 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12679 /* We know that this was set up by `grokclassfn'. We do not
12680 wait until `store_parm_decls', since evil parse errors may
12681 never get us to that point. Here we keep the consistency
12682 between `current_class_type' and `current_class_ptr'. */
12683 tree t = DECL_ARGUMENTS (decl1);
12685 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12686 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12688 cp_function_chain->x_current_class_ref
12689 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12690 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12691 cp_function_chain->x_current_class_ptr = t;
12693 /* Constructors and destructors need to know whether they're "in
12694 charge" of initializing virtual base classes. */
12695 t = DECL_CHAIN (t);
12696 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12698 current_in_charge_parm = t;
12699 t = DECL_CHAIN (t);
12701 if (DECL_HAS_VTT_PARM_P (decl1))
12703 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12704 current_vtt_parm = t;
12708 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12709 /* Implicitly-defined methods (like the
12710 destructor for a class in which no destructor
12711 is explicitly declared) must not be defined
12712 until their definition is needed. So, we
12713 ignore interface specifications for
12714 compiler-generated functions. */
12715 && !DECL_ARTIFICIAL (decl1));
12717 if (processing_template_decl)
12718 /* Don't mess with interface flags. */;
12719 else if (DECL_INTERFACE_KNOWN (decl1))
12721 tree ctx = decl_function_context (decl1);
12723 if (DECL_NOT_REALLY_EXTERN (decl1))
12724 DECL_EXTERNAL (decl1) = 0;
12726 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12727 && TREE_PUBLIC (ctx))
12728 /* This is a function in a local class in an extern inline
12730 comdat_linkage (decl1);
12732 /* If this function belongs to an interface, it is public.
12733 If it belongs to someone else's interface, it is also external.
12734 This only affects inlines and template instantiations. */
12735 else if (!finfo->interface_unknown && honor_interface)
12737 if (DECL_DECLARED_INLINE_P (decl1)
12738 || DECL_TEMPLATE_INSTANTIATION (decl1))
12740 DECL_EXTERNAL (decl1)
12741 = (finfo->interface_only
12742 || (DECL_DECLARED_INLINE_P (decl1)
12743 && ! flag_implement_inlines
12744 && !DECL_VINDEX (decl1)));
12746 /* For WIN32 we also want to put these in linkonce sections. */
12747 maybe_make_one_only (decl1);
12750 DECL_EXTERNAL (decl1) = 0;
12751 DECL_INTERFACE_KNOWN (decl1) = 1;
12752 /* If this function is in an interface implemented in this file,
12753 make sure that the back end knows to emit this function
12755 if (!DECL_EXTERNAL (decl1))
12756 mark_needed (decl1);
12758 else if (finfo->interface_unknown && finfo->interface_only
12759 && honor_interface)
12761 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12762 interface, we will have both finfo->interface_unknown and
12763 finfo->interface_only set. In that case, we don't want to
12764 use the normal heuristics because someone will supply a
12765 #pragma implementation elsewhere, and deducing it here would
12766 produce a conflict. */
12767 comdat_linkage (decl1);
12768 DECL_EXTERNAL (decl1) = 0;
12769 DECL_INTERFACE_KNOWN (decl1) = 1;
12770 DECL_DEFER_OUTPUT (decl1) = 1;
12774 /* This is a definition, not a reference.
12775 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12776 if (!GNU_INLINE_P (decl1))
12777 DECL_EXTERNAL (decl1) = 0;
12779 if ((DECL_DECLARED_INLINE_P (decl1)
12780 || DECL_TEMPLATE_INSTANTIATION (decl1))
12781 && ! DECL_INTERFACE_KNOWN (decl1))
12782 DECL_DEFER_OUTPUT (decl1) = 1;
12784 DECL_INTERFACE_KNOWN (decl1) = 1;
12787 /* Determine the ELF visibility attribute for the function. We must not
12788 do this before calling "pushdecl", as we must allow "duplicate_decls"
12789 to merge any attributes appropriately. We also need to wait until
12791 if (!DECL_CLONED_FUNCTION_P (decl1))
12792 determine_visibility (decl1);
12794 begin_scope (sk_function_parms, decl1);
12798 if (DECL_DESTRUCTOR_P (decl1)
12799 || (DECL_CONSTRUCTOR_P (decl1)
12800 && targetm.cxx.cdtor_returns_this ()))
12802 cdtor_label = build_decl (input_location,
12803 LABEL_DECL, NULL_TREE, NULL_TREE);
12804 DECL_CONTEXT (cdtor_label) = current_function_decl;
12807 start_fname_decls ();
12809 store_parm_decls (current_function_parms);
12813 /* Like start_preparsed_function, except that instead of a
12814 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12816 Returns 1 on success. If the DECLARATOR is not suitable for a function
12817 (it defines a datum instead), we return 0, which tells
12818 yyparse to report a parse error. */
12821 start_function (cp_decl_specifier_seq *declspecs,
12822 const cp_declarator *declarator,
12827 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12828 if (decl1 == error_mark_node)
12830 /* If the declarator is not suitable for a function definition,
12831 cause a syntax error. */
12832 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12834 error ("invalid function declaration");
12838 if (DECL_MAIN_P (decl1))
12839 /* main must return int. grokfndecl should have corrected it
12840 (and issued a diagnostic) if the user got it wrong. */
12841 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12842 integer_type_node));
12844 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12849 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12853 use_eh_spec_block (tree fn)
12855 return (flag_exceptions && flag_enforce_eh_specs
12856 && !processing_template_decl
12857 && !type_throw_all_p (TREE_TYPE (fn))
12858 /* We insert the EH_SPEC_BLOCK only in the original
12859 function; then, it is copied automatically to the
12861 && !DECL_CLONED_FUNCTION_P (fn)
12862 /* Implicitly-generated constructors and destructors have
12863 exception specifications. However, those specifications
12864 are the union of the possible exceptions specified by the
12865 constructors/destructors for bases and members, so no
12866 unallowed exception will ever reach this function. By
12867 not creating the EH_SPEC_BLOCK we save a little memory,
12868 and we avoid spurious warnings about unreachable
12870 && !DECL_DEFAULTED_FN (fn));
12873 /* Store the parameter declarations into the current function declaration.
12874 This is called after parsing the parameter declarations, before
12875 digesting the body of the function.
12877 Also install to binding contour return value identifier, if any. */
12880 store_parm_decls (tree current_function_parms)
12882 tree fndecl = current_function_decl;
12885 /* This is a chain of any other decls that came in among the parm
12886 declarations. If a parm is declared with enum {foo, bar} x;
12887 then CONST_DECLs for foo and bar are put here. */
12888 tree nonparms = NULL_TREE;
12890 if (current_function_parms)
12892 /* This case is when the function was defined with an ANSI prototype.
12893 The parms already have decls, so we need not do anything here
12894 except record them as in effect
12895 and complain if any redundant old-style parm decls were written. */
12897 tree specparms = current_function_parms;
12900 /* Must clear this because it might contain TYPE_DECLs declared
12902 current_binding_level->names = NULL;
12904 /* If we're doing semantic analysis, then we'll call pushdecl
12905 for each of these. We must do them in reverse order so that
12906 they end in the correct forward order. */
12907 specparms = nreverse (specparms);
12909 for (parm = specparms; parm; parm = next)
12911 next = DECL_CHAIN (parm);
12912 if (TREE_CODE (parm) == PARM_DECL)
12914 if (DECL_NAME (parm) == NULL_TREE
12915 || TREE_CODE (parm) != VOID_TYPE)
12918 error ("parameter %qD declared void", parm);
12922 /* If we find an enum constant or a type tag,
12923 put it aside for the moment. */
12924 TREE_CHAIN (parm) = NULL_TREE;
12925 nonparms = chainon (nonparms, parm);
12929 /* Get the decls in their original chain order and record in the
12930 function. This is all and only the PARM_DECLs that were
12931 pushed into scope by the loop above. */
12932 DECL_ARGUMENTS (fndecl) = getdecls ();
12935 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12937 /* Now store the final chain of decls for the arguments
12938 as the decl-chain of the current lexical scope.
12939 Put the enumerators in as well, at the front so that
12940 DECL_ARGUMENTS is not modified. */
12941 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12943 if (use_eh_spec_block (current_function_decl))
12944 current_eh_spec_block = begin_eh_spec_block ();
12948 /* We have finished doing semantic analysis on DECL, but have not yet
12949 generated RTL for its body. Save away our current state, so that
12950 when we want to generate RTL later we know what to do. */
12953 save_function_data (tree decl)
12955 struct language_function *f;
12957 /* Save the language-specific per-function data so that we can
12958 get it back when we really expand this function. */
12959 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12962 f = ggc_alloc_language_function ();
12963 memcpy (f, cp_function_chain, sizeof (struct language_function));
12964 DECL_SAVED_FUNCTION_DATA (decl) = f;
12966 /* Clear out the bits we don't need. */
12967 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
12968 f->bindings = NULL;
12969 f->x_local_names = NULL;
12973 /* Set the return value of the constructor (if present). */
12976 finish_constructor_body (void)
12981 if (targetm.cxx.cdtor_returns_this ()
12982 && (! TYPE_FOR_JAVA (current_class_type)))
12984 /* Any return from a constructor will end up here. */
12985 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12987 val = DECL_ARGUMENTS (current_function_decl);
12988 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12989 DECL_RESULT (current_function_decl), val);
12990 /* Return the address of the object. */
12991 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12992 add_stmt (exprstmt);
12996 /* Do all the processing for the beginning of a destructor; set up the
12997 vtable pointers and cleanups for bases and members. */
13000 begin_destructor_body (void)
13002 tree compound_stmt;
13004 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13005 issued an error message. We still want to try to process the
13006 body of the function, but initialize_vtbl_ptrs will crash if
13007 TYPE_BINFO is NULL. */
13008 if (COMPLETE_TYPE_P (current_class_type))
13010 compound_stmt = begin_compound_stmt (0);
13011 /* Make all virtual function table pointers in non-virtual base
13012 classes point to CURRENT_CLASS_TYPE's virtual function
13014 initialize_vtbl_ptrs (current_class_ptr);
13015 finish_compound_stmt (compound_stmt);
13017 /* And insert cleanups for our bases and members so that they
13018 will be properly destroyed if we throw. */
13019 push_base_cleanups ();
13023 /* At the end of every destructor we generate code to delete the object if
13024 necessary. Do that now. */
13027 finish_destructor_body (void)
13031 /* Any return from a destructor will end up here; that way all base
13032 and member cleanups will be run when the function returns. */
13033 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13035 /* In a virtual destructor, we must call delete. */
13036 if (DECL_VIRTUAL_P (current_function_decl))
13039 tree virtual_size = cxx_sizeof (current_class_type);
13043 At the point of definition of a virtual destructor (including
13044 an implicit definition), non-placement operator delete shall
13045 be looked up in the scope of the destructor's class and if
13046 found shall be accessible and unambiguous. */
13047 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13049 /*global_p=*/false,
13050 /*placement=*/NULL_TREE,
13051 /*alloc_fn=*/NULL_TREE);
13053 if_stmt = begin_if_stmt ();
13054 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13055 current_in_charge_parm,
13058 finish_expr_stmt (exprstmt);
13059 finish_then_clause (if_stmt);
13060 finish_if_stmt (if_stmt);
13063 if (targetm.cxx.cdtor_returns_this ())
13067 val = DECL_ARGUMENTS (current_function_decl);
13068 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13069 DECL_RESULT (current_function_decl), val);
13070 /* Return the address of the object. */
13071 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13072 add_stmt (exprstmt);
13076 /* Do the necessary processing for the beginning of a function body, which
13077 in this case includes member-initializers, but not the catch clauses of
13078 a function-try-block. Currently, this means opening a binding level
13079 for the member-initializers (in a ctor), member cleanups (in a dtor),
13080 and capture proxies (in a lambda operator()). */
13083 begin_function_body (void)
13087 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13090 if (processing_template_decl)
13091 /* Do nothing now. */;
13093 /* Always keep the BLOCK node associated with the outermost pair of
13094 curly braces of a function. These are needed for correct
13095 operation of dwarfout.c. */
13096 keep_next_level (true);
13098 stmt = begin_compound_stmt (BCS_FN_BODY);
13100 if (processing_template_decl)
13101 /* Do nothing now. */;
13102 else if (DECL_DESTRUCTOR_P (current_function_decl))
13103 begin_destructor_body ();
13108 /* Do the processing for the end of a function body. Currently, this means
13109 closing out the cleanups for fully-constructed bases and members, and in
13110 the case of the destructor, deleting the object if desired. Again, this
13111 is only meaningful for [cd]tors, since they are the only functions where
13112 there is a significant distinction between the main body and any
13113 function catch clauses. Handling, say, main() return semantics here
13114 would be wrong, as flowing off the end of a function catch clause for
13115 main() would also need to return 0. */
13118 finish_function_body (tree compstmt)
13120 if (compstmt == NULL_TREE)
13123 /* Close the block. */
13124 finish_compound_stmt (compstmt);
13126 if (processing_template_decl)
13127 /* Do nothing now. */;
13128 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13129 finish_constructor_body ();
13130 else if (DECL_DESTRUCTOR_P (current_function_decl))
13131 finish_destructor_body ();
13134 /* Given a function, returns the BLOCK corresponding to the outermost level
13135 of curly braces, skipping the artificial block created for constructor
13139 outer_curly_brace_block (tree fndecl)
13141 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13142 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13143 /* Skip the artificial function body block. */
13144 block = BLOCK_SUBBLOCKS (block);
13148 /* If FNDECL is a class's key method, add the class to the list of
13149 keyed classes that should be emitted. */
13152 record_key_method_defined (tree fndecl)
13154 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13155 && DECL_VIRTUAL_P (fndecl)
13156 && !processing_template_decl)
13158 tree fnclass = DECL_CONTEXT (fndecl);
13159 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13160 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13164 /* Subroutine of finish_function.
13165 Save the body of constexpr functions for possible
13166 future compile time evaluation. */
13169 maybe_save_function_definition (tree fun)
13171 if (!processing_template_decl
13172 && DECL_DECLARED_CONSTEXPR_P (fun)
13173 && !DECL_CLONED_FUNCTION_P (fun))
13174 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13177 /* Finish up a function declaration and compile that function
13178 all the way to assembler language output. The free the storage
13179 for the function definition.
13181 FLAGS is a bitwise or of the following values:
13183 We just finished processing the body of an in-class inline
13184 function definition. (This processing will have taken place
13185 after the class definition is complete.) */
13188 finish_function (int flags)
13190 tree fndecl = current_function_decl;
13191 tree fntype, ctype = NULL_TREE;
13192 int inclass_inline = (flags & 2) != 0;
13194 /* When we get some parse errors, we can end up without a
13195 current_function_decl, so cope. */
13196 if (fndecl == NULL_TREE)
13197 return error_mark_node;
13199 if (c_dialect_objc ())
13200 objc_finish_function ();
13202 gcc_assert (!defer_mark_used_calls);
13203 defer_mark_used_calls = true;
13205 record_key_method_defined (fndecl);
13207 fntype = TREE_TYPE (fndecl);
13209 /* TREE_READONLY (fndecl) = 1;
13210 This caused &foo to be of type ptr-to-const-function
13211 which then got a warning when stored in a ptr-to-function variable. */
13213 gcc_assert (building_stmt_list_p ());
13214 /* The current function is being defined, so its DECL_INITIAL should
13215 be set, and unless there's a multiple definition, it should be
13216 error_mark_node. */
13217 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13219 /* For a cloned function, we've already got all the code we need;
13220 there's no need to add any extra bits. */
13221 if (!DECL_CLONED_FUNCTION_P (fndecl))
13223 if (DECL_MAIN_P (current_function_decl))
13225 /* Make it so that `main' always returns 0 by default (or
13228 finish_return_stmt (integer_one_node);
13230 finish_return_stmt (integer_zero_node);
13234 if (use_eh_spec_block (current_function_decl))
13235 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13236 (TREE_TYPE (current_function_decl)),
13237 current_eh_spec_block);
13240 /* If we're saving up tree structure, tie off the function now. */
13241 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13243 finish_fname_decls ();
13245 /* If this function can't throw any exceptions, remember that. */
13246 if (!processing_template_decl
13247 && !cp_function_chain->can_throw
13248 && !flag_non_call_exceptions
13249 && !decl_replaceable_p (fndecl))
13250 TREE_NOTHROW (fndecl) = 1;
13252 /* This must come after expand_function_end because cleanups might
13253 have declarations (from inline functions) that need to go into
13254 this function's blocks. */
13256 /* If the current binding level isn't the outermost binding level
13257 for this function, either there is a bug, or we have experienced
13258 syntax errors and the statement tree is malformed. */
13259 if (current_binding_level->kind != sk_function_parms)
13261 /* Make sure we have already experienced errors. */
13262 gcc_assert (errorcount);
13264 /* Throw away the broken statement tree and extra binding
13266 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13268 while (current_binding_level->kind != sk_function_parms)
13270 if (current_binding_level->kind == sk_class)
13271 pop_nested_class ();
13273 poplevel (0, 0, 0);
13276 poplevel (1, 0, 1);
13278 /* Statements should always be full-expressions at the outermost set
13279 of curly braces for a function. */
13280 gcc_assert (stmts_are_full_exprs_p ());
13282 /* Save constexpr function body before it gets munged by
13283 the NRV transformation. */
13284 maybe_save_function_definition (fndecl);
13286 /* Set up the named return value optimization, if we can. Candidate
13287 variables are selected in check_return_expr. */
13288 if (current_function_return_value)
13290 tree r = current_function_return_value;
13293 if (r != error_mark_node
13294 /* This is only worth doing for fns that return in memory--and
13295 simpler, since we don't have to worry about promoted modes. */
13296 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13297 /* Only allow this for variables declared in the outer scope of
13298 the function so we know that their lifetime always ends with a
13299 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13300 we were to do this optimization in tree-ssa. */
13301 && (outer = outer_curly_brace_block (fndecl))
13302 && chain_member (r, BLOCK_VARS (outer)))
13303 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13305 current_function_return_value = NULL_TREE;
13308 /* Remember that we were in class scope. */
13309 if (current_class_name)
13310 ctype = current_class_type;
13312 /* Must mark the RESULT_DECL as being in this function. */
13313 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13315 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13316 to the FUNCTION_DECL node itself. */
13317 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13319 /* Save away current state, if appropriate. */
13320 if (!processing_template_decl)
13321 save_function_data (fndecl);
13323 /* Complain if there's just no return statement. */
13324 if (warn_return_type
13325 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13326 && !dependent_type_p (TREE_TYPE (fntype))
13327 && !current_function_returns_value && !current_function_returns_null
13328 /* Don't complain if we abort or throw. */
13329 && !current_function_returns_abnormally
13330 /* Don't complain if we are declared noreturn. */
13331 && !TREE_THIS_VOLATILE (fndecl)
13332 && !DECL_NAME (DECL_RESULT (fndecl))
13333 && !TREE_NO_WARNING (fndecl)
13334 /* Structor return values (if any) are set by the compiler. */
13335 && !DECL_CONSTRUCTOR_P (fndecl)
13336 && !DECL_DESTRUCTOR_P (fndecl))
13338 warning (OPT_Wreturn_type,
13339 "no return statement in function returning non-void");
13340 TREE_NO_WARNING (fndecl) = 1;
13343 /* Store the end of the function, so that we get good line number
13344 info for the epilogue. */
13345 cfun->function_end_locus = input_location;
13347 /* Complain about parameters that are only set, but never otherwise used. */
13348 if (warn_unused_but_set_parameter
13349 && !processing_template_decl
13350 && errorcount == unused_but_set_errorcount
13351 && !DECL_CLONED_FUNCTION_P (fndecl))
13355 for (decl = DECL_ARGUMENTS (fndecl);
13357 decl = DECL_CHAIN (decl))
13358 if (TREE_USED (decl)
13359 && TREE_CODE (decl) == PARM_DECL
13360 && !DECL_READ_P (decl)
13361 && DECL_NAME (decl)
13362 && !DECL_ARTIFICIAL (decl)
13363 && !TREE_NO_WARNING (decl)
13364 && !DECL_IN_SYSTEM_HEADER (decl)
13365 && TREE_TYPE (decl) != error_mark_node
13366 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13367 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13368 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13369 warning (OPT_Wunused_but_set_parameter,
13370 "parameter %q+D set but not used", decl);
13371 unused_but_set_errorcount = errorcount;
13374 /* Complain about locally defined typedefs that are not used in this
13376 maybe_warn_unused_local_typedefs ();
13378 /* Genericize before inlining. */
13379 if (!processing_template_decl)
13381 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13382 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13383 cp_genericize (fndecl);
13384 /* Clear out the bits we don't need. */
13385 f->x_current_class_ptr = NULL;
13386 f->x_current_class_ref = NULL;
13387 f->x_eh_spec_block = NULL;
13388 f->x_in_charge_parm = NULL;
13389 f->x_vtt_parm = NULL;
13390 f->x_return_value = NULL;
13391 f->bindings = NULL;
13392 f->extern_decl_map = NULL;
13394 /* Clear out the bits we don't need. */
13395 local_names = NULL;
13397 /* We're leaving the context of this function, so zap cfun. It's still in
13398 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13400 current_function_decl = NULL;
13402 /* If this is an in-class inline definition, we may have to pop the
13403 bindings for the template parameters that we added in
13404 maybe_begin_member_template_processing when start_function was
13406 if (inclass_inline)
13407 maybe_end_member_template_processing ();
13409 /* Leave the scope of the class. */
13411 pop_nested_class ();
13416 current_function_decl = NULL_TREE;
13418 defer_mark_used_calls = false;
13419 if (deferred_mark_used_calls)
13424 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13426 VEC_free (tree, gc, deferred_mark_used_calls);
13432 /* Create the FUNCTION_DECL for a function definition.
13433 DECLSPECS and DECLARATOR are the parts of the declaration;
13434 they describe the return type and the name of the function,
13435 but twisted together in a fashion that parallels the syntax of C.
13437 This function creates a binding context for the function body
13438 as well as setting up the FUNCTION_DECL in current_function_decl.
13440 Returns a FUNCTION_DECL on success.
13442 If the DECLARATOR is not suitable for a function (it defines a datum
13443 instead), we return 0, which tells yyparse to report a parse error.
13445 May return void_type_node indicating that this method is actually
13446 a friend. See grokfield for more details.
13448 Came here with a `.pushlevel' .
13450 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13451 CHANGES TO CODE IN `grokfield'. */
13454 grokmethod (cp_decl_specifier_seq *declspecs,
13455 const cp_declarator *declarator, tree attrlist)
13457 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13460 if (fndecl == error_mark_node)
13461 return error_mark_node;
13463 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13465 error ("invalid member function declaration");
13466 return error_mark_node;
13470 cplus_decl_attributes (&fndecl, attrlist, 0);
13472 /* Pass friends other than inline friend functions back. */
13473 if (fndecl == void_type_node)
13476 if (DECL_IN_AGGR_P (fndecl))
13478 if (DECL_CLASS_SCOPE_P (fndecl))
13479 error ("%qD is already defined in class %qT", fndecl,
13480 DECL_CONTEXT (fndecl));
13481 return error_mark_node;
13484 check_template_shadow (fndecl);
13486 DECL_DECLARED_INLINE_P (fndecl) = 1;
13487 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13489 /* We process method specializations in finish_struct_1. */
13490 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13492 fndecl = push_template_decl (fndecl);
13493 if (fndecl == error_mark_node)
13497 if (! DECL_FRIEND_P (fndecl))
13499 if (DECL_CHAIN (fndecl))
13501 fndecl = copy_node (fndecl);
13502 TREE_CHAIN (fndecl) = NULL_TREE;
13506 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13508 DECL_IN_AGGR_P (fndecl) = 1;
13513 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13514 we can lay it out later, when and if its type becomes complete. */
13517 maybe_register_incomplete_var (tree var)
13519 gcc_assert (TREE_CODE (var) == VAR_DECL);
13521 /* Keep track of variables with incomplete types. */
13522 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13523 && DECL_EXTERNAL (var))
13525 tree inner_type = TREE_TYPE (var);
13527 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13528 inner_type = TREE_TYPE (inner_type);
13529 inner_type = TYPE_MAIN_VARIANT (inner_type);
13531 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13532 /* RTTI TD entries are created while defining the type_info. */
13533 || (TYPE_LANG_SPECIFIC (inner_type)
13534 && TYPE_BEING_DEFINED (inner_type)))
13537 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13539 iv->incomplete_type = inner_type;
13544 /* Called when a class type (given by TYPE) is defined. If there are
13545 any existing VAR_DECLs whose type has been completed by this
13546 declaration, update them now. */
13549 complete_vars (tree type)
13552 incomplete_var *iv;
13554 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13556 if (same_type_p (type, iv->incomplete_type))
13558 tree var = iv->decl;
13559 tree type = TREE_TYPE (var);
13560 /* Complete the type of the variable. The VAR_DECL itself
13561 will be laid out in expand_expr. */
13562 complete_type (type);
13563 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13564 /* Remove this entry from the list. */
13565 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13571 /* Check for pending declarations which may have abstract type. */
13572 complete_type_check_abstract (type);
13575 /* If DECL is of a type which needs a cleanup, build and return an
13576 expression to perform that cleanup here. Return NULL_TREE if no
13577 cleanup need be done. */
13580 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13586 /* Assume no cleanup is required. */
13587 cleanup = NULL_TREE;
13589 if (error_operand_p (decl))
13592 /* Handle "__attribute__((cleanup))". We run the cleanup function
13593 before the destructor since the destructor is what actually
13594 terminates the lifetime of the object. */
13595 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13602 /* Get the name specified by the user for the cleanup function. */
13603 id = TREE_VALUE (TREE_VALUE (attr));
13604 /* Look up the name to find the cleanup function to call. It is
13605 important to use lookup_name here because that is what is
13606 used in c-common.c:handle_cleanup_attribute when performing
13607 initial checks on the attribute. Note that those checks
13608 include ensuring that the function found is not an overloaded
13609 function, or an object with an overloaded call operator,
13610 etc.; we can rely on the fact that the function found is an
13611 ordinary FUNCTION_DECL. */
13612 fn = lookup_name (id);
13613 arg = build_address (decl);
13615 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13616 if (cleanup == error_mark_node)
13617 return error_mark_node;
13619 /* Handle ordinary C++ destructors. */
13620 type = TREE_TYPE (decl);
13621 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13623 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13624 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13625 && CLASSTYPE_VBASECLASSES (type));
13629 if (TREE_CODE (type) == ARRAY_TYPE)
13632 addr = build_address (decl);
13634 /* Optimize for space over speed here. */
13635 if (!has_vbases || flag_expensive_optimizations)
13636 flags |= LOOKUP_NONVIRTUAL;
13638 call = build_delete (TREE_TYPE (addr), addr,
13639 sfk_complete_destructor, flags, 0, complain);
13640 if (call == error_mark_node)
13641 cleanup = error_mark_node;
13643 cleanup = cp_build_compound_expr (cleanup, call, complain);
13651 /* When a stmt has been parsed, this function is called. */
13658 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13659 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13660 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13663 static_fn_type (tree memfntype)
13668 if (TYPE_PTRMEMFUNC_P (memfntype))
13669 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13670 if (POINTER_TYPE_P (memfntype)
13671 || TREE_CODE (memfntype) == FUNCTION_DECL)
13672 memfntype = TREE_TYPE (memfntype);
13673 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13675 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13676 args = TYPE_ARG_TYPES (memfntype);
13677 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13678 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13679 fntype = (cp_build_type_attribute_variant
13680 (fntype, TYPE_ATTRIBUTES (memfntype)));
13681 fntype = (build_exception_variant
13682 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13686 /* DECL was originally constructed as a non-static member function,
13687 but turned out to be static. Update it accordingly. */
13690 revert_static_member_fn (tree decl)
13692 tree stype = static_fn_type (decl);
13693 cp_cv_quals quals = type_memfn_quals (stype);
13695 if (quals != TYPE_UNQUALIFIED)
13696 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13698 TREE_TYPE (decl) = stype;
13700 if (DECL_ARGUMENTS (decl))
13701 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13702 DECL_STATIC_FUNCTION_P (decl) = 1;
13705 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13706 one of the language-independent trees. */
13708 enum cp_tree_node_structure_enum
13709 cp_tree_node_structure (union lang_tree_node * t)
13711 switch (TREE_CODE (&t->generic))
13713 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13714 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13715 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13716 case OVERLOAD: return TS_CP_OVERLOAD;
13717 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13718 case PTRMEM_CST: return TS_CP_PTRMEM;
13719 case BASELINK: return TS_CP_BASELINK;
13720 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13721 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13722 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13723 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13724 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13725 default: return TS_CP_GENERIC;
13729 /* Build the void_list_node (void_type_node having been created). */
13731 build_void_list_node (void)
13733 tree t = build_tree_list (NULL_TREE, void_type_node);
13738 cp_missing_noreturn_ok_p (tree decl)
13740 /* A missing noreturn is ok for the `main' function. */
13741 return DECL_MAIN_P (decl);
13744 /* Return the COMDAT group into which DECL should be placed. */
13747 cxx_comdat_group (tree decl)
13751 /* Virtual tables, construction virtual tables, and virtual table
13752 tables all go in a single COMDAT group, named after the primary
13754 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13755 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13756 /* For all other DECLs, the COMDAT group is the mangled name of the
13757 declaration itself. */
13760 while (DECL_THUNK_P (decl))
13762 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13763 into the same section as the target function. In that case
13764 we must return target's name. */
13765 tree target = THUNK_TARGET (decl);
13766 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13767 && DECL_SECTION_NAME (target) != NULL
13768 && DECL_ONE_ONLY (target))
13773 name = DECL_ASSEMBLER_NAME (decl);
13779 #include "gt-cp-decl.h"