1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, tree *, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, tree *);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (DECL_P (olddecl)
1207 && TREE_CODE (newdecl) == FUNCTION_DECL
1208 && TREE_CODE (olddecl) == FUNCTION_DECL
1209 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1211 if (DECL_DECLARED_INLINE_P (newdecl)
1212 && DECL_UNINLINABLE (newdecl)
1213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1214 /* Already warned elsewhere. */;
1215 else if (DECL_DECLARED_INLINE_P (olddecl)
1216 && DECL_UNINLINABLE (olddecl)
1217 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 /* Already warned. */;
1219 else if (DECL_DECLARED_INLINE_P (newdecl)
1220 && DECL_UNINLINABLE (olddecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1225 warning (OPT_Wattributes, "previous declaration of %q+D "
1226 "with attribute noinline", olddecl);
1228 else if (DECL_DECLARED_INLINE_P (olddecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1232 warning (OPT_Wattributes, "function %q+D redeclared with "
1233 "attribute noinline", newdecl);
1234 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1239 /* Check for redeclaration and other discrepancies. */
1240 if (TREE_CODE (olddecl) == FUNCTION_DECL
1241 && DECL_ARTIFICIAL (olddecl))
1243 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1244 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1246 /* Avoid warnings redeclaring built-ins which have not been
1247 explicitly declared. */
1248 if (DECL_ANTICIPATED (olddecl))
1251 /* If you declare a built-in or predefined function name as static,
1252 the old definition is overridden, but optionally warn this was a
1253 bad choice of name. */
1254 if (! TREE_PUBLIC (newdecl))
1256 warning (OPT_Wshadow,
1257 DECL_BUILT_IN (olddecl)
1258 ? G_("shadowing built-in function %q#D")
1259 : G_("shadowing library function %q#D"), olddecl);
1260 /* Discard the old built-in function. */
1263 /* If the built-in is not ansi, then programs can override
1264 it even globally without an error. */
1265 else if (! DECL_BUILT_IN (olddecl))
1266 warning (0, "library function %q#D redeclared as non-function %q#D",
1270 error ("declaration of %q#D", newdecl);
1271 error ("conflicts with built-in declaration %q#D",
1276 else if (!types_match)
1278 /* Avoid warnings redeclaring built-ins which have not been
1279 explicitly declared. */
1280 if (DECL_ANTICIPATED (olddecl))
1282 /* Deal with fileptr_type_node. FILE type is not known
1283 at the time we create the builtins. */
1286 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1287 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1289 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1292 else if (TREE_VALUE (t2) == fileptr_type_node)
1294 tree t = TREE_VALUE (t1);
1296 if (TREE_CODE (t) == POINTER_TYPE
1297 && TYPE_NAME (TREE_TYPE (t))
1298 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1299 == get_identifier ("FILE")
1300 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1302 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1305 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1306 types_match = decls_match (newdecl, olddecl);
1308 return duplicate_decls (newdecl, olddecl,
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1313 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1316 else if ((DECL_EXTERN_C_P (newdecl)
1317 && DECL_EXTERN_C_P (olddecl))
1318 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1321 /* A near match; override the builtin. */
1323 if (TREE_PUBLIC (newdecl))
1325 warning (0, "new declaration %q#D", newdecl);
1326 warning (0, "ambiguates built-in declaration %q#D",
1330 warning (OPT_Wshadow,
1331 DECL_BUILT_IN (olddecl)
1332 ? G_("shadowing built-in function %q#D")
1333 : G_("shadowing library function %q#D"), olddecl);
1336 /* Discard the old built-in function. */
1339 /* Replace the old RTL to avoid problems with inlining. */
1340 COPY_DECL_RTL (newdecl, olddecl);
1342 /* Even if the types match, prefer the new declarations type for
1343 built-ins which have not been explicitly declared, for
1344 exception lists, etc... */
1345 else if (DECL_IS_BUILTIN (olddecl))
1347 tree type = TREE_TYPE (newdecl);
1348 tree attribs = (*targetm.merge_type_attributes)
1349 (TREE_TYPE (olddecl), type);
1351 type = cp_build_type_attribute_variant (type, attribs);
1352 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1355 /* If a function is explicitly declared "throw ()", propagate that to
1356 the corresponding builtin. */
1357 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1358 && DECL_ANTICIPATED (olddecl)
1359 && TREE_NOTHROW (newdecl)
1360 && !TREE_NOTHROW (olddecl))
1362 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1363 tree tmpdecl = builtin_decl_explicit (fncode);
1364 if (tmpdecl && tmpdecl != olddecl && types_match)
1365 TREE_NOTHROW (tmpdecl) = 1;
1368 /* Whether or not the builtin can throw exceptions has no
1369 bearing on this declarator. */
1370 TREE_NOTHROW (olddecl) = 0;
1372 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1374 /* If a builtin function is redeclared as `static', merge
1375 the declarations, but make the original one static. */
1376 DECL_THIS_STATIC (olddecl) = 1;
1377 TREE_PUBLIC (olddecl) = 0;
1379 /* Make the old declaration consistent with the new one so
1380 that all remnants of the builtin-ness of this function
1381 will be banished. */
1382 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1383 COPY_DECL_RTL (newdecl, olddecl);
1386 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1388 /* C++ Standard, 3.3, clause 4:
1389 "[Note: a namespace name or a class template name must be unique
1390 in its declarative region (7.3.2, clause 14). ]" */
1391 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1392 && TREE_CODE (newdecl) != NAMESPACE_DECL
1393 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1394 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1395 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1396 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1398 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1399 && TREE_CODE (newdecl) != TYPE_DECL)
1400 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1401 && TREE_CODE (olddecl) != TYPE_DECL))
1403 /* We do nothing special here, because C++ does such nasty
1404 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1405 get shadowed, and know that if we need to find a TYPE_DECL
1406 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1407 slot of the identifier. */
1411 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1412 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1413 || (TREE_CODE (olddecl) == FUNCTION_DECL
1414 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1418 error ("%q#D redeclared as different kind of symbol", newdecl);
1419 if (TREE_CODE (olddecl) == TREE_LIST)
1420 olddecl = TREE_VALUE (olddecl);
1421 error ("previous declaration of %q+#D", olddecl);
1423 return error_mark_node;
1425 else if (!types_match)
1427 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1428 /* These are certainly not duplicate declarations; they're
1429 from different scopes. */
1432 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1434 /* The name of a class template may not be declared to refer to
1435 any other template, class, function, object, namespace, value,
1436 or type in the same scope. */
1437 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1438 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1440 error ("declaration of template %q#D", newdecl);
1441 error ("conflicts with previous declaration %q+#D", olddecl);
1443 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1444 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1445 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1446 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1447 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1448 DECL_TEMPLATE_PARMS (olddecl))
1449 /* Template functions can be disambiguated by
1451 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1452 TREE_TYPE (TREE_TYPE (olddecl))))
1454 error ("new declaration %q#D", newdecl);
1455 error ("ambiguates old declaration %q+#D", olddecl);
1459 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1461 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1463 error ("declaration of C function %q#D conflicts with",
1465 error ("previous declaration %q+#D here", olddecl);
1468 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1469 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1471 error ("new declaration %q#D", newdecl);
1472 error ("ambiguates old declaration %q+#D", olddecl);
1473 return error_mark_node;
1480 error ("conflicting declaration %q#D", newdecl);
1481 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1482 return error_mark_node;
1485 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1486 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1487 && (!DECL_TEMPLATE_INFO (newdecl)
1488 || (DECL_TI_TEMPLATE (newdecl)
1489 != DECL_TI_TEMPLATE (olddecl))))
1490 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1491 && (!DECL_TEMPLATE_INFO (olddecl)
1492 || (DECL_TI_TEMPLATE (olddecl)
1493 != DECL_TI_TEMPLATE (newdecl))))))
1494 /* It's OK to have a template specialization and a non-template
1495 with the same type, or to have specializations of two
1496 different templates with the same type. Note that if one is a
1497 specialization, and the other is an instantiation of the same
1498 template, that we do not exit at this point. That situation
1499 can occur if we instantiate a template class, and then
1500 specialize one of its methods. This situation is valid, but
1501 the declarations must be merged in the usual way. */
1503 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1504 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1505 && !DECL_USE_TEMPLATE (newdecl))
1506 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1507 && !DECL_USE_TEMPLATE (olddecl))))
1508 /* One of the declarations is a template instantiation, and the
1509 other is not a template at all. That's OK. */
1511 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1513 /* In [namespace.alias] we have:
1515 In a declarative region, a namespace-alias-definition can be
1516 used to redefine a namespace-alias declared in that declarative
1517 region to refer only to the namespace to which it already
1520 Therefore, if we encounter a second alias directive for the same
1521 alias, we can just ignore the second directive. */
1522 if (DECL_NAMESPACE_ALIAS (newdecl)
1523 && (DECL_NAMESPACE_ALIAS (newdecl)
1524 == DECL_NAMESPACE_ALIAS (olddecl)))
1526 /* [namespace.alias]
1528 A namespace-name or namespace-alias shall not be declared as
1529 the name of any other entity in the same declarative region.
1530 A namespace-name defined at global scope shall not be
1531 declared as the name of any other entity in any global scope
1533 error ("declaration of namespace %qD conflicts with", newdecl);
1534 error ("previous declaration of namespace %q+D here", olddecl);
1535 return error_mark_node;
1539 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1542 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1543 if (DECL_NAME (olddecl) != NULL_TREE)
1544 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1545 ? "%q+#D previously defined here"
1546 : "%q+#D previously declared here", olddecl);
1547 return error_mark_node;
1549 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1550 && DECL_INITIAL (olddecl) != NULL_TREE
1551 && !prototype_p (TREE_TYPE (olddecl))
1552 && prototype_p (TREE_TYPE (newdecl)))
1554 /* Prototype decl follows defn w/o prototype. */
1555 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1556 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1557 "follows non-prototype definition here");
1559 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1560 || TREE_CODE (olddecl) == VAR_DECL)
1561 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1564 If two declarations of the same function or object
1565 specify different linkage-specifications ..., the program
1566 is ill-formed.... Except for functions with C++ linkage,
1567 a function declaration without a linkage specification
1568 shall not precede the first linkage specification for
1569 that function. A function can be declared without a
1570 linkage specification after an explicit linkage
1571 specification has been seen; the linkage explicitly
1572 specified in the earlier declaration is not affected by
1573 such a function declaration.
1575 DR 563 raises the question why the restrictions on
1576 functions should not also apply to objects. Older
1577 versions of G++ silently ignore the linkage-specification
1585 which is clearly wrong. Therefore, we now treat objects
1587 if (current_lang_depth () == 0)
1589 /* There is no explicit linkage-specification, so we use
1590 the linkage from the previous declaration. */
1591 if (!DECL_LANG_SPECIFIC (newdecl))
1592 retrofit_lang_decl (newdecl);
1593 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1597 error ("previous declaration of %q+#D with %qL linkage",
1598 olddecl, DECL_LANGUAGE (olddecl));
1599 error ("conflicts with new declaration with %qL linkage",
1600 DECL_LANGUAGE (newdecl));
1604 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1606 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1608 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1609 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1612 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1613 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1615 for (; t1 && t1 != void_list_node;
1616 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1617 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1619 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1622 permerror (input_location, "default argument given for parameter %d of %q#D",
1624 permerror (input_location, "after previous specification in %q+#D", olddecl);
1628 error ("default argument given for parameter %d of %q#D",
1630 error ("after previous specification in %q+#D",
1637 /* Do not merge an implicit typedef with an explicit one. In:
1641 typedef class A A __attribute__ ((foo));
1643 the attribute should apply only to the typedef. */
1644 if (TREE_CODE (olddecl) == TYPE_DECL
1645 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1646 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1649 /* If new decl is `static' and an `extern' was seen previously,
1651 warn_extern_redeclared_static (newdecl, olddecl);
1653 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1654 return error_mark_node;
1656 /* We have committed to returning 1 at this point. */
1657 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1659 /* Now that functions must hold information normally held
1660 by field decls, there is extra work to do so that
1661 declaration information does not get destroyed during
1663 if (DECL_VINDEX (olddecl))
1664 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1665 if (DECL_CONTEXT (olddecl))
1666 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1667 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1668 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1669 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1670 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1671 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1672 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1673 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1674 SET_OVERLOADED_OPERATOR_CODE
1675 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1676 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1678 /* Optionally warn about more than one declaration for the same
1679 name, but don't warn about a function declaration followed by a
1681 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1682 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1683 /* Don't warn about extern decl followed by definition. */
1684 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1685 /* Don't warn about friends, let add_friend take care of it. */
1686 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1688 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1689 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1692 if (DECL_DELETED_FN (newdecl))
1694 error ("deleted definition of %qD", newdecl);
1695 error ("after previous declaration %q+D", olddecl);
1697 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1700 /* Deal with C++: must preserve virtual function table size. */
1701 if (TREE_CODE (olddecl) == TYPE_DECL)
1703 tree newtype = TREE_TYPE (newdecl);
1704 tree oldtype = TREE_TYPE (olddecl);
1706 if (newtype != error_mark_node && oldtype != error_mark_node
1707 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1708 CLASSTYPE_FRIEND_CLASSES (newtype)
1709 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1711 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1714 /* Copy all the DECL_... slots specified in the new decl
1715 except for any that we copy here from the old type. */
1716 DECL_ATTRIBUTES (newdecl)
1717 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1719 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1723 old_result = DECL_TEMPLATE_RESULT (olddecl);
1724 new_result = DECL_TEMPLATE_RESULT (newdecl);
1725 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1726 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1727 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1728 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1730 DECL_ATTRIBUTES (old_result)
1731 = (*targetm.merge_decl_attributes) (old_result, new_result);
1733 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1735 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1736 && DECL_INITIAL (new_result))
1738 if (DECL_INITIAL (old_result))
1739 DECL_UNINLINABLE (old_result) = 1;
1741 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1742 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1743 DECL_NOT_REALLY_EXTERN (old_result)
1744 = DECL_NOT_REALLY_EXTERN (new_result);
1745 DECL_INTERFACE_KNOWN (old_result)
1746 = DECL_INTERFACE_KNOWN (new_result);
1747 DECL_DECLARED_INLINE_P (old_result)
1748 = DECL_DECLARED_INLINE_P (new_result);
1749 DECL_DISREGARD_INLINE_LIMITS (old_result)
1750 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1755 DECL_DECLARED_INLINE_P (old_result)
1756 |= DECL_DECLARED_INLINE_P (new_result);
1757 DECL_DISREGARD_INLINE_LIMITS (old_result)
1758 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1759 check_redeclaration_exception_specification (newdecl, olddecl);
1763 /* If the new declaration is a definition, update the file and
1764 line information on the declaration, and also make
1765 the old declaration the same definition. */
1766 if (DECL_INITIAL (new_result) != NULL_TREE)
1768 DECL_SOURCE_LOCATION (olddecl)
1769 = DECL_SOURCE_LOCATION (old_result)
1770 = DECL_SOURCE_LOCATION (newdecl);
1771 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1772 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1775 DECL_ARGUMENTS (old_result)
1776 = DECL_ARGUMENTS (new_result);
1777 for (parm = DECL_ARGUMENTS (old_result); parm;
1778 parm = DECL_CHAIN (parm))
1779 DECL_CONTEXT (parm) = old_result;
1788 /* Automatically handles default parameters. */
1789 tree oldtype = TREE_TYPE (olddecl);
1792 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1793 maybe_instantiate_noexcept (olddecl);
1795 /* Merge the data types specified in the two decls. */
1796 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1798 /* If merge_types produces a non-typedef type, just use the old type. */
1799 if (TREE_CODE (newdecl) == TYPE_DECL
1800 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1803 if (TREE_CODE (newdecl) == VAR_DECL)
1805 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1806 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1807 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1808 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1809 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1810 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1812 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1813 if (DECL_LANG_SPECIFIC (olddecl)
1814 && CP_DECL_THREADPRIVATE_P (olddecl))
1816 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1817 if (!DECL_LANG_SPECIFIC (newdecl))
1818 retrofit_lang_decl (newdecl);
1820 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1821 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1825 /* Do this after calling `merge_types' so that default
1826 parameters don't confuse us. */
1827 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1828 check_redeclaration_exception_specification (newdecl, olddecl);
1829 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1831 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1832 check_default_args (newdecl);
1834 /* Lay the type out, unless already done. */
1835 if (! same_type_p (newtype, oldtype)
1836 && TREE_TYPE (newdecl) != error_mark_node
1837 && !(processing_template_decl && uses_template_parms (newdecl)))
1838 layout_type (TREE_TYPE (newdecl));
1840 if ((TREE_CODE (newdecl) == VAR_DECL
1841 || TREE_CODE (newdecl) == PARM_DECL
1842 || TREE_CODE (newdecl) == RESULT_DECL
1843 || TREE_CODE (newdecl) == FIELD_DECL
1844 || TREE_CODE (newdecl) == TYPE_DECL)
1845 && !(processing_template_decl && uses_template_parms (newdecl)))
1846 layout_decl (newdecl, 0);
1848 /* Merge the type qualifiers. */
1849 if (TREE_READONLY (newdecl))
1850 TREE_READONLY (olddecl) = 1;
1851 if (TREE_THIS_VOLATILE (newdecl))
1852 TREE_THIS_VOLATILE (olddecl) = 1;
1853 if (TREE_NOTHROW (newdecl))
1854 TREE_NOTHROW (olddecl) = 1;
1856 /* Merge deprecatedness. */
1857 if (TREE_DEPRECATED (newdecl))
1858 TREE_DEPRECATED (olddecl) = 1;
1860 /* Preserve function specific target and optimization options */
1861 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1863 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1864 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1865 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1866 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1868 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1869 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1870 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1871 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1874 /* Merge the initialization information. */
1875 if (DECL_INITIAL (newdecl) == NULL_TREE
1876 && DECL_INITIAL (olddecl) != NULL_TREE)
1878 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1879 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1880 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1882 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1883 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1887 /* Merge the section attribute.
1888 We want to issue an error if the sections conflict but that must be
1889 done later in decl_attributes since we are called before attributes
1891 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1892 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1894 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1896 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1897 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1898 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1899 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1900 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1901 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1902 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1903 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1904 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1905 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1906 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1907 /* Keep the old RTL. */
1908 COPY_DECL_RTL (olddecl, newdecl);
1910 else if (TREE_CODE (newdecl) == VAR_DECL
1911 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1913 /* Keep the old RTL. We cannot keep the old RTL if the old
1914 declaration was for an incomplete object and the new
1915 declaration is not since many attributes of the RTL will
1917 COPY_DECL_RTL (olddecl, newdecl);
1920 /* If cannot merge, then use the new type and qualifiers,
1921 and don't preserve the old rtl. */
1924 /* Clean out any memory we had of the old declaration. */
1925 tree oldstatic = value_member (olddecl, static_aggregates);
1927 TREE_VALUE (oldstatic) = error_mark_node;
1929 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1930 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1931 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1932 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1935 /* Merge the storage class information. */
1936 merge_weak (newdecl, olddecl);
1938 if (DECL_ONE_ONLY (olddecl))
1939 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1941 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1942 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1943 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1944 if (! DECL_EXTERNAL (olddecl))
1945 DECL_EXTERNAL (newdecl) = 0;
1947 new_template_info = NULL_TREE;
1948 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1950 bool new_redefines_gnu_inline = false;
1952 if (new_defines_function
1953 && ((DECL_INTERFACE_KNOWN (olddecl)
1954 && TREE_CODE (olddecl) == FUNCTION_DECL)
1955 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1956 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1957 == FUNCTION_DECL))))
1961 if (TREE_CODE (fn) == TEMPLATE_DECL)
1962 fn = DECL_TEMPLATE_RESULT (olddecl);
1964 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1967 if (!new_redefines_gnu_inline)
1969 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1970 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1971 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1973 DECL_TEMPLATE_INSTANTIATED (newdecl)
1974 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1975 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1977 /* If the OLDDECL is an instantiation and/or specialization,
1978 then the NEWDECL must be too. But, it may not yet be marked
1979 as such if the caller has created NEWDECL, but has not yet
1980 figured out that it is a redeclaration. */
1981 if (!DECL_USE_TEMPLATE (newdecl))
1982 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1984 /* Don't really know how much of the language-specific
1985 values we should copy from old to new. */
1986 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1987 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1988 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1989 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1991 if (LANG_DECL_HAS_MIN (newdecl))
1993 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1994 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1995 if (DECL_TEMPLATE_INFO (newdecl))
1996 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1997 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1999 /* Only functions have these fields. */
2000 if (TREE_CODE (newdecl) == FUNCTION_DECL
2001 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2003 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2004 olddecl_friend = DECL_FRIEND_P (olddecl);
2005 hidden_friend = (DECL_ANTICIPATED (olddecl)
2006 && DECL_HIDDEN_FRIEND_P (olddecl)
2007 && newdecl_is_friend);
2008 DECL_BEFRIENDING_CLASSES (newdecl)
2009 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2010 DECL_BEFRIENDING_CLASSES (olddecl));
2011 /* DECL_THUNKS is only valid for virtual functions,
2012 otherwise it is a DECL_FRIEND_CONTEXT. */
2013 if (DECL_VIRTUAL_P (newdecl))
2014 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2016 /* Only variables have this field. */
2017 else if (TREE_CODE (newdecl) == VAR_DECL
2018 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2019 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2022 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2026 /* Merge parameter attributes. */
2027 tree oldarg, newarg;
2028 for (oldarg = DECL_ARGUMENTS(olddecl),
2029 newarg = DECL_ARGUMENTS(newdecl);
2031 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2032 DECL_ATTRIBUTES (newarg)
2033 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2034 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2037 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2038 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2040 /* If newdecl is not a specialization, then it is not a
2041 template-related function at all. And that means that we
2042 should have exited above, returning 0. */
2043 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2045 if (DECL_ODR_USED (olddecl))
2046 /* From [temp.expl.spec]:
2048 If a template, a member template or the member of a class
2049 template is explicitly specialized then that
2050 specialization shall be declared before the first use of
2051 that specialization that would cause an implicit
2052 instantiation to take place, in every translation unit in
2053 which such a use occurs. */
2054 error ("explicit specialization of %qD after first use",
2057 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2059 /* Don't propagate visibility from the template to the
2060 specialization here. We'll do that in determine_visibility if
2062 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2064 /* [temp.expl.spec/14] We don't inline explicit specialization
2065 just because the primary template says so. */
2067 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2068 the always_inline attribute. */
2069 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2070 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2072 if (DECL_DECLARED_INLINE_P (newdecl))
2073 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2075 DECL_ATTRIBUTES (newdecl)
2076 = remove_attribute ("always_inline",
2077 DECL_ATTRIBUTES (newdecl));
2080 else if (new_defines_function && DECL_INITIAL (olddecl))
2082 /* Never inline re-defined extern inline functions.
2083 FIXME: this could be better handled by keeping both
2084 function as separate declarations. */
2085 DECL_UNINLINABLE (newdecl) = 1;
2089 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2090 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2092 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2094 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2095 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2097 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2098 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2099 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2100 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2103 /* Preserve abstractness on cloned [cd]tors. */
2104 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2106 /* Update newdecl's parms to point at olddecl. */
2107 for (parm = DECL_ARGUMENTS (newdecl); parm;
2108 parm = DECL_CHAIN (parm))
2109 DECL_CONTEXT (parm) = olddecl;
2113 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2114 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2115 COPY_DECL_RTL (newdecl, olddecl);
2117 if (! types_match || new_defines_function)
2119 /* These need to be copied so that the names are available.
2120 Note that if the types do match, we'll preserve inline
2121 info and other bits, but if not, we won't. */
2122 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2123 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2125 if (new_defines_function)
2126 /* If defining a function declared with other language
2127 linkage, use the previously declared language linkage. */
2128 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2129 else if (types_match)
2131 /* If redeclaring a builtin function, and not a definition,
2132 it stays built in. */
2133 if (DECL_BUILT_IN (olddecl))
2135 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2136 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2137 /* If we're keeping the built-in definition, keep the rtl,
2138 regardless of declaration matches. */
2139 COPY_DECL_RTL (olddecl, newdecl);
2140 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2142 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2145 /* If a compatible prototype of these builtin functions
2146 is seen, assume the runtime implements it with the
2147 expected semantics. */
2148 case BUILT_IN_STPCPY:
2149 if (builtin_decl_explicit_p (fncode))
2150 set_builtin_decl_implicit_p (fncode, true);
2158 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2159 /* Don't clear out the arguments if we're just redeclaring a
2161 if (DECL_ARGUMENTS (olddecl))
2162 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2165 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2166 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2168 /* Now preserve various other info from the definition. */
2169 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2170 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2171 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2172 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2174 /* Warn about conflicting visibility specifications. */
2175 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2176 && DECL_VISIBILITY_SPECIFIED (newdecl)
2177 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2179 warning_at (input_location, OPT_Wattributes,
2180 "%q+D: visibility attribute ignored because it", newdecl);
2181 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2182 "conflicts with previous declaration here");
2184 /* Choose the declaration which specified visibility. */
2185 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2187 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2188 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2190 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2191 so keep this behavior. */
2192 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2194 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2195 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2197 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2198 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2199 if (TREE_CODE (newdecl) == FIELD_DECL)
2200 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2202 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2203 with that from NEWDECL below. */
2204 if (DECL_LANG_SPECIFIC (olddecl))
2206 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2207 != DECL_LANG_SPECIFIC (newdecl));
2208 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2211 /* Merge the USED information. */
2212 if (TREE_USED (olddecl))
2213 TREE_USED (newdecl) = 1;
2214 else if (TREE_USED (newdecl))
2215 TREE_USED (olddecl) = 1;
2216 if (TREE_CODE (newdecl) == VAR_DECL)
2218 if (DECL_READ_P (olddecl))
2219 DECL_READ_P (newdecl) = 1;
2220 else if (DECL_READ_P (newdecl))
2221 DECL_READ_P (olddecl) = 1;
2223 if (DECL_PRESERVE_P (olddecl))
2224 DECL_PRESERVE_P (newdecl) = 1;
2225 else if (DECL_PRESERVE_P (newdecl))
2226 DECL_PRESERVE_P (olddecl) = 1;
2228 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2232 function_size = sizeof (struct tree_decl_common);
2234 memcpy ((char *) olddecl + sizeof (struct tree_common),
2235 (char *) newdecl + sizeof (struct tree_common),
2236 function_size - sizeof (struct tree_common));
2238 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2239 (char *) newdecl + sizeof (struct tree_decl_common),
2240 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2241 if (new_template_info)
2242 /* If newdecl is a template instantiation, it is possible that
2243 the following sequence of events has occurred:
2245 o A friend function was declared in a class template. The
2246 class template was instantiated.
2248 o The instantiation of the friend declaration was
2249 recorded on the instantiation list, and is newdecl.
2251 o Later, however, instantiate_class_template called pushdecl
2252 on the newdecl to perform name injection. But, pushdecl in
2253 turn called duplicate_decls when it discovered that another
2254 declaration of a global function with the same name already
2257 o Here, in duplicate_decls, we decided to clobber newdecl.
2259 If we're going to do that, we'd better make sure that
2260 olddecl, and not newdecl, is on the list of
2261 instantiations so that if we try to do the instantiation
2262 again we won't get the clobbered declaration. */
2263 reregister_specialization (newdecl,
2269 size_t size = tree_code_size (TREE_CODE (olddecl));
2270 memcpy ((char *) olddecl + sizeof (struct tree_common),
2271 (char *) newdecl + sizeof (struct tree_common),
2272 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2273 switch (TREE_CODE (olddecl))
2283 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2284 (char *) newdecl + sizeof (struct tree_decl_common),
2285 size - sizeof (struct tree_decl_common)
2286 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2290 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2291 (char *) newdecl + sizeof (struct tree_decl_common),
2292 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2293 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2297 DECL_UID (olddecl) = olddecl_uid;
2299 DECL_FRIEND_P (olddecl) = 1;
2302 DECL_ANTICIPATED (olddecl) = 1;
2303 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2306 /* NEWDECL contains the merged attribute lists.
2307 Update OLDDECL to be the same. */
2308 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2310 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2311 so that encode_section_info has a chance to look at the new decl
2312 flags and attributes. */
2313 if (DECL_RTL_SET_P (olddecl)
2314 && (TREE_CODE (olddecl) == FUNCTION_DECL
2315 || (TREE_CODE (olddecl) == VAR_DECL
2316 && TREE_STATIC (olddecl))))
2317 make_decl_rtl (olddecl);
2319 /* The NEWDECL will no longer be needed. Because every out-of-class
2320 declaration of a member results in a call to duplicate_decls,
2321 freeing these nodes represents in a significant savings. */
2327 /* Return zero if the declaration NEWDECL is valid
2328 when the declaration OLDDECL (assumed to be for the same name)
2329 has already been seen.
2330 Otherwise return an error message format string with a %s
2331 where the identifier should go. */
2334 redeclaration_error_message (tree newdecl, tree olddecl)
2336 if (TREE_CODE (newdecl) == TYPE_DECL)
2338 /* Because C++ can put things into name space for free,
2339 constructs like "typedef struct foo { ... } foo"
2340 would look like an erroneous redeclaration. */
2341 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2344 return G_("redefinition of %q#D");
2346 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2348 /* If this is a pure function, its olddecl will actually be
2349 the original initialization to `0' (which we force to call
2350 abort()). Don't complain about redefinition in this case. */
2351 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2352 && DECL_INITIAL (olddecl) == NULL_TREE)
2355 /* If both functions come from different namespaces, this is not
2356 a redeclaration - this is a conflict with a used function. */
2357 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2358 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2359 && ! decls_match (olddecl, newdecl))
2360 return G_("%qD conflicts with used function");
2362 /* We'll complain about linkage mismatches in
2363 warn_extern_redeclared_static. */
2365 /* Defining the same name twice is no good. */
2366 if (DECL_INITIAL (olddecl) != NULL_TREE
2367 && DECL_INITIAL (newdecl) != NULL_TREE)
2369 if (DECL_NAME (olddecl) == NULL_TREE)
2370 return G_("%q#D not declared in class");
2371 else if (!GNU_INLINE_P (olddecl)
2372 || GNU_INLINE_P (newdecl))
2373 return G_("redefinition of %q#D");
2376 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2378 bool olda = GNU_INLINE_P (olddecl);
2379 bool newa = GNU_INLINE_P (newdecl);
2384 return G_("%q+D redeclared inline with "
2385 "%<gnu_inline%> attribute");
2387 return G_("%q+D redeclared inline without "
2388 "%<gnu_inline%> attribute");
2394 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2398 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2400 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2401 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2402 return G_("redefinition of %q#D");
2406 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2407 || (DECL_TEMPLATE_RESULT (newdecl)
2408 == DECL_TEMPLATE_RESULT (olddecl)))
2411 nt = DECL_TEMPLATE_RESULT (newdecl);
2412 if (DECL_TEMPLATE_INFO (nt))
2413 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2414 ot = DECL_TEMPLATE_RESULT (olddecl);
2415 if (DECL_TEMPLATE_INFO (ot))
2416 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2417 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2418 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2419 return G_("redefinition of %q#D");
2421 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2423 bool olda = GNU_INLINE_P (ot);
2424 bool newa = GNU_INLINE_P (nt);
2429 return G_("%q+D redeclared inline with "
2430 "%<gnu_inline%> attribute");
2432 return G_("%q+D redeclared inline without "
2433 "%<gnu_inline%> attribute");
2437 /* Core issue #226 (C++0x):
2439 If a friend function template declaration specifies a
2440 default template-argument, that declaration shall be a
2441 definition and shall be the only declaration of the
2442 function template in the translation unit. */
2443 if ((cxx_dialect != cxx98)
2444 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2445 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2446 /*is_primary=*/1, /*is_partial=*/0,
2447 /*is_friend_decl=*/2))
2448 return G_("redeclaration of friend %q#D "
2449 "may not have default template arguments");
2453 else if (TREE_CODE (newdecl) == VAR_DECL
2454 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2455 && (! DECL_LANG_SPECIFIC (olddecl)
2456 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2457 || DECL_THREAD_LOCAL_P (newdecl)))
2459 /* Only variables can be thread-local, and all declarations must
2460 agree on this property. */
2461 if (DECL_THREAD_LOCAL_P (newdecl))
2462 return G_("thread-local declaration of %q#D follows "
2463 "non-thread-local declaration");
2465 return G_("non-thread-local declaration of %q#D follows "
2466 "thread-local declaration");
2468 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2470 /* The objects have been declared at namespace scope. If either
2471 is a member of an anonymous union, then this is an invalid
2472 redeclaration. For example:
2478 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2479 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2480 return G_("redeclaration of %q#D");
2481 /* If at least one declaration is a reference, there is no
2482 conflict. For example:
2488 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2490 /* Reject two definitions. */
2491 return G_("redefinition of %q#D");
2495 /* Objects declared with block scope: */
2496 /* Reject two definitions, and reject a definition
2497 together with an external reference. */
2498 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2499 return G_("redeclaration of %q#D");
2504 /* Hash and equality functions for the named_label table. */
2507 named_label_entry_hash (const void *data)
2509 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2510 return DECL_UID (ent->label_decl);
2514 named_label_entry_eq (const void *a, const void *b)
2516 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2517 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2518 return ent_a->label_decl == ent_b->label_decl;
2521 /* Create a new label, named ID. */
2524 make_label_decl (tree id, int local_p)
2526 struct named_label_entry *ent;
2530 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2532 DECL_CONTEXT (decl) = current_function_decl;
2533 DECL_MODE (decl) = VOIDmode;
2534 C_DECLARED_LABEL_FLAG (decl) = local_p;
2536 /* Say where one reference is to the label, for the sake of the
2537 error if it is not defined. */
2538 DECL_SOURCE_LOCATION (decl) = input_location;
2540 /* Record the fact that this identifier is bound to this label. */
2541 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2543 /* Create the label htab for the function on demand. */
2545 named_labels = htab_create_ggc (13, named_label_entry_hash,
2546 named_label_entry_eq, NULL);
2548 /* Record this label on the list of labels used in this function.
2549 We do this before calling make_label_decl so that we get the
2550 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2551 ent = ggc_alloc_cleared_named_label_entry ();
2552 ent->label_decl = decl;
2554 slot = htab_find_slot (named_labels, ent, INSERT);
2555 gcc_assert (*slot == NULL);
2561 /* Look for a label named ID in the current function. If one cannot
2562 be found, create one. (We keep track of used, but undefined,
2563 labels, and complain about them at the end of a function.) */
2566 lookup_label_1 (tree id)
2570 /* You can't use labels at global scope. */
2571 if (current_function_decl == NULL_TREE)
2573 error ("label %qE referenced outside of any function", id);
2577 /* See if we've already got this label. */
2578 decl = IDENTIFIER_LABEL_VALUE (id);
2579 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2582 decl = make_label_decl (id, /*local_p=*/0);
2586 /* Wrapper for lookup_label_1. */
2589 lookup_label (tree id)
2592 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2593 ret = lookup_label_1 (id);
2594 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2598 /* Declare a local label named ID. */
2601 declare_local_label (tree id)
2604 cp_label_binding *bind;
2606 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2607 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2608 bind = VEC_safe_push (cp_label_binding, gc,
2609 current_binding_level->shadowed_labels, NULL);
2610 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2612 decl = make_label_decl (id, /*local_p=*/1);
2618 /* Returns nonzero if it is ill-formed to jump past the declaration of
2619 DECL. Returns 2 if it's also a real problem. */
2622 decl_jump_unsafe (tree decl)
2624 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2625 with automatic storage duration is not in scope to a point where it is
2626 in scope is ill-formed unless the variable has scalar type, class type
2627 with a trivial default constructor and a trivial destructor, a
2628 cv-qualified version of one of these types, or an array of one of the
2629 preceding types and is declared without an initializer (8.5). */
2630 tree type = TREE_TYPE (decl);
2632 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2633 || type == error_mark_node)
2636 type = strip_array_types (type);
2638 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2639 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2642 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2648 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2651 identify_goto (tree decl, const location_t *locus)
2654 permerror (input_location, "jump to label %qD", decl);
2656 permerror (input_location, "jump to case label");
2658 permerror (*locus, " from here");
2661 /* Check that a single previously seen jump to a newly defined label
2662 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2663 the jump context; NAMES are the names in scope in LEVEL at the jump
2664 context; LOCUS is the source position of the jump or 0. Returns
2665 true if all is well. */
2668 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2669 bool exited_omp, const location_t *locus)
2671 cp_binding_level *b;
2672 bool identified = false, saw_eh = false, saw_omp = false;
2676 identify_goto (decl, locus);
2677 error (" exits OpenMP structured block");
2678 identified = saw_omp = true;
2681 for (b = current_binding_level; b ; b = b->level_chain)
2683 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2685 for (new_decls = b->names; new_decls != old_decls;
2686 new_decls = DECL_CHAIN (new_decls))
2688 int problem = decl_jump_unsafe (new_decls);
2694 identify_goto (decl, locus);
2698 error (" crosses initialization of %q+#D", new_decls);
2700 permerror (input_location, " enters scope of %q+#D which has "
2701 "non-trivial destructor", new_decls);
2706 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2710 identify_goto (decl, locus);
2713 if (b->kind == sk_try)
2714 error (" enters try block");
2716 error (" enters catch block");
2719 if (b->kind == sk_omp && !saw_omp)
2723 identify_goto (decl, locus);
2726 error (" enters OpenMP structured block");
2735 check_previous_goto (tree decl, struct named_label_use_entry *use)
2737 check_previous_goto_1 (decl, use->binding_level,
2738 use->names_in_scope, use->in_omp_scope,
2739 &use->o_goto_locus);
2743 check_switch_goto (cp_binding_level* level)
2745 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2748 /* Check that a new jump to a label DECL is OK. Called by
2749 finish_goto_stmt. */
2752 check_goto (tree decl)
2754 struct named_label_entry *ent, dummy;
2755 bool saw_catch = false, identified = false;
2759 /* We can't know where a computed goto is jumping.
2760 So we assume that it's OK. */
2761 if (TREE_CODE (decl) != LABEL_DECL)
2764 /* We didn't record any information about this label when we created it,
2765 and there's not much point since it's trivial to analyze as a return. */
2766 if (decl == cdtor_label)
2769 dummy.label_decl = decl;
2770 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2771 gcc_assert (ent != NULL);
2773 /* If the label hasn't been defined yet, defer checking. */
2774 if (! DECL_INITIAL (decl))
2776 struct named_label_use_entry *new_use;
2778 /* Don't bother creating another use if the last goto had the
2779 same data, and will therefore create the same set of errors. */
2781 && ent->uses->names_in_scope == current_binding_level->names)
2784 new_use = ggc_alloc_named_label_use_entry ();
2785 new_use->binding_level = current_binding_level;
2786 new_use->names_in_scope = current_binding_level->names;
2787 new_use->o_goto_locus = input_location;
2788 new_use->in_omp_scope = false;
2790 new_use->next = ent->uses;
2791 ent->uses = new_use;
2795 if (ent->in_try_scope || ent->in_catch_scope
2796 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2798 permerror (input_location, "jump to label %q+D", decl);
2799 permerror (input_location, " from here");
2803 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2805 int u = decl_jump_unsafe (bad);
2807 if (u > 1 && DECL_ARTIFICIAL (bad))
2809 /* Can't skip init of __exception_info. */
2810 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2814 error (" skips initialization of %q+#D", bad);
2816 permerror (input_location, " enters scope of %q+#D which has "
2817 "non-trivial destructor", bad);
2820 if (ent->in_try_scope)
2821 error (" enters try block");
2822 else if (ent->in_catch_scope && !saw_catch)
2823 error (" enters catch block");
2825 if (ent->in_omp_scope)
2826 error (" enters OpenMP structured block");
2827 else if (flag_openmp)
2829 cp_binding_level *b;
2830 for (b = current_binding_level; b ; b = b->level_chain)
2832 if (b == ent->binding_level)
2834 if (b->kind == sk_omp)
2838 permerror (input_location, "jump to label %q+D", decl);
2839 permerror (input_location, " from here");
2842 error (" exits OpenMP structured block");
2849 /* Check that a return is ok wrt OpenMP structured blocks.
2850 Called by finish_return_stmt. Returns true if all is well. */
2853 check_omp_return (void)
2855 cp_binding_level *b;
2856 for (b = current_binding_level; b ; b = b->level_chain)
2857 if (b->kind == sk_omp)
2859 error ("invalid exit from OpenMP structured block");
2862 else if (b->kind == sk_function_parms)
2867 /* Define a label, specifying the location in the source file.
2868 Return the LABEL_DECL node for the label. */
2871 define_label_1 (location_t location, tree name)
2873 struct named_label_entry *ent, dummy;
2874 cp_binding_level *p;
2877 decl = lookup_label (name);
2879 dummy.label_decl = decl;
2880 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2881 gcc_assert (ent != NULL);
2883 /* After labels, make any new cleanups in the function go into their
2884 own new (temporary) binding contour. */
2885 for (p = current_binding_level;
2886 p->kind != sk_function_parms;
2888 p->more_cleanups_ok = 0;
2890 if (name == get_identifier ("wchar_t"))
2891 permerror (input_location, "label named wchar_t");
2893 if (DECL_INITIAL (decl) != NULL_TREE)
2895 error ("duplicate label %qD", decl);
2896 return error_mark_node;
2900 struct named_label_use_entry *use;
2902 /* Mark label as having been defined. */
2903 DECL_INITIAL (decl) = error_mark_node;
2904 /* Say where in the source. */
2905 DECL_SOURCE_LOCATION (decl) = location;
2907 ent->binding_level = current_binding_level;
2908 ent->names_in_scope = current_binding_level->names;
2910 for (use = ent->uses; use ; use = use->next)
2911 check_previous_goto (decl, use);
2918 /* Wrapper for define_label_1. */
2921 define_label (location_t location, tree name)
2924 timevar_start (TV_NAME_LOOKUP);
2925 ret = define_label_1 (location, name);
2926 timevar_stop (TV_NAME_LOOKUP);
2933 cp_binding_level *level;
2934 struct cp_switch *next;
2935 /* The SWITCH_STMT being built. */
2937 /* A splay-tree mapping the low element of a case range to the high
2938 element, or NULL_TREE if there is no high element. Used to
2939 determine whether or not a new case label duplicates an old case
2940 label. We need a tree, rather than simply a hash table, because
2941 of the GNU case range extension. */
2945 /* A stack of the currently active switch statements. The innermost
2946 switch statement is on the top of the stack. There is no need to
2947 mark the stack for garbage collection because it is only active
2948 during the processing of the body of a function, and we never
2949 collect at that point. */
2951 static struct cp_switch *switch_stack;
2953 /* Called right after a switch-statement condition is parsed.
2954 SWITCH_STMT is the switch statement being parsed. */
2957 push_switch (tree switch_stmt)
2959 struct cp_switch *p = XNEW (struct cp_switch);
2960 p->level = current_binding_level;
2961 p->next = switch_stack;
2962 p->switch_stmt = switch_stmt;
2963 p->cases = splay_tree_new (case_compare, NULL, NULL);
2970 struct cp_switch *cs = switch_stack;
2971 location_t switch_location;
2973 /* Emit warnings as needed. */
2974 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2975 if (!processing_template_decl)
2976 c_do_switch_warnings (cs->cases, switch_location,
2977 SWITCH_STMT_TYPE (cs->switch_stmt),
2978 SWITCH_STMT_COND (cs->switch_stmt));
2980 splay_tree_delete (cs->cases);
2981 switch_stack = switch_stack->next;
2985 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2986 condition. Note that if TYPE and VALUE are already integral we don't
2987 really do the conversion because the language-independent
2988 warning/optimization code will work better that way. */
2991 case_conversion (tree type, tree value)
2993 if (value == NULL_TREE)
2996 if (cxx_dialect >= cxx0x
2997 && (SCOPED_ENUM_P (type)
2998 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3000 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3001 type = type_promotes_to (type);
3002 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3004 return cxx_constant_value (value);
3007 /* Note that we've seen a definition of a case label, and complain if this
3008 is a bad place for one. */
3011 finish_case_label (location_t loc, tree low_value, tree high_value)
3014 cp_binding_level *p;
3017 if (processing_template_decl)
3021 /* For templates, just add the case label; we'll do semantic
3022 analysis at instantiation-time. */
3023 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3024 return add_stmt (build_case_label (low_value, high_value, label));
3027 /* Find the condition on which this switch statement depends. */
3028 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3029 if (cond && TREE_CODE (cond) == TREE_LIST)
3030 cond = TREE_VALUE (cond);
3032 if (!check_switch_goto (switch_stack->level))
3033 return error_mark_node;
3035 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3037 low_value = case_conversion (type, low_value);
3038 high_value = case_conversion (type, high_value);
3040 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3041 low_value, high_value);
3043 /* After labels, make any new cleanups in the function go into their
3044 own new (temporary) binding contour. */
3045 for (p = current_binding_level;
3046 p->kind != sk_function_parms;
3048 p->more_cleanups_ok = 0;
3053 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3056 typename_hash (const void* k)
3059 const_tree const t = (const_tree) k;
3061 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3062 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3067 typedef struct typename_info {
3075 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3076 really of type `typename_info*' */
3079 typename_compare (const void * k1, const void * k2)
3081 const_tree const t1 = (const_tree) k1;
3082 const typename_info *const t2 = (const typename_info *) k2;
3084 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3085 && TYPE_CONTEXT (t1) == t2->scope
3086 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3087 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3088 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3091 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3092 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3094 Returns the new TYPENAME_TYPE. */
3096 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3099 build_typename_type (tree context, tree name, tree fullname,
3100 enum tag_types tag_type)
3108 if (typename_htab == NULL)
3109 typename_htab = htab_create_ggc (61, &typename_hash,
3110 &typename_compare, NULL);
3112 ti.scope = FROB_CONTEXT (context);
3114 ti.template_id = fullname;
3115 ti.enum_p = tag_type == enum_type;
3116 ti.class_p = (tag_type == class_type
3117 || tag_type == record_type
3118 || tag_type == union_type);
3119 hash = (htab_hash_pointer (ti.scope)
3120 ^ htab_hash_pointer (ti.name));
3122 /* See if we already have this type. */
3123 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3128 /* Build the TYPENAME_TYPE. */
3129 t = cxx_make_type (TYPENAME_TYPE);
3130 TYPE_CONTEXT (t) = ti.scope;
3131 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3132 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3133 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3135 /* Build the corresponding TYPE_DECL. */
3136 d = build_decl (input_location, TYPE_DECL, name, t);
3137 TYPE_NAME (TREE_TYPE (d)) = d;
3138 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3139 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3140 DECL_ARTIFICIAL (d) = 1;
3142 /* Store it in the hash table. */
3145 /* TYPENAME_TYPEs must always be compared structurally, because
3146 they may or may not resolve down to another type depending on
3147 the currently open classes. */
3148 SET_TYPE_STRUCTURAL_EQUALITY (t);
3154 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3155 provided to name the type. Returns an appropriate type, unless an
3156 error occurs, in which case error_mark_node is returned. If we
3157 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3158 return that, rather than the _TYPE it corresponds to, in other
3159 cases we look through the type decl. If TF_ERROR is set, complain
3160 about errors, otherwise be quiet. */
3163 make_typename_type (tree context, tree name, enum tag_types tag_type,
3164 tsubst_flags_t complain)
3170 if (name == error_mark_node
3171 || context == NULL_TREE
3172 || context == error_mark_node)
3173 return error_mark_node;
3177 if (!(TYPE_LANG_SPECIFIC (name)
3178 && (CLASSTYPE_IS_TEMPLATE (name)
3179 || CLASSTYPE_USE_TEMPLATE (name))))
3180 name = TYPE_IDENTIFIER (name);
3182 /* Create a TEMPLATE_ID_EXPR for the type. */
3183 name = build_nt (TEMPLATE_ID_EXPR,
3184 CLASSTYPE_TI_TEMPLATE (name),
3185 CLASSTYPE_TI_ARGS (name));
3187 else if (TREE_CODE (name) == TYPE_DECL)
3188 name = DECL_NAME (name);
3192 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3194 name = TREE_OPERAND (name, 0);
3195 if (TREE_CODE (name) == TEMPLATE_DECL)
3196 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3197 else if (TREE_CODE (name) == OVERLOAD)
3199 error ("%qD is not a type", name);
3200 return error_mark_node;
3203 if (TREE_CODE (name) == TEMPLATE_DECL)
3205 error ("%qD used without template parameters", name);
3206 return error_mark_node;
3208 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3209 gcc_assert (TYPE_P (context));
3211 if (!MAYBE_CLASS_TYPE_P (context))
3213 if (complain & tf_error)
3214 error ("%q#T is not a class", context);
3215 return error_mark_node;
3218 /* When the CONTEXT is a dependent type, NAME could refer to a
3219 dependent base class of CONTEXT. But look inside it anyway
3220 if CONTEXT is a currently open scope, in case it refers to a
3221 member of the current instantiation or a non-dependent base;
3222 lookup will stop when we hit a dependent base. */
3223 if (!dependent_scope_p (context))
3224 /* We should only set WANT_TYPE when we're a nested typename type.
3225 Then we can give better diagnostics if we find a non-type. */
3226 t = lookup_field (context, name, 2, /*want_type=*/true);
3230 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3231 return build_typename_type (context, name, fullname, tag_type);
3233 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3237 if (complain & tf_error)
3238 error (want_template ? "no class template named %q#T in %q#T"
3239 : "no type named %q#T in %q#T", name, context);
3240 return error_mark_node;
3243 /* Pull out the template from an injected-class-name (or multiple). */
3245 t = maybe_get_template_decl_from_type_decl (t);
3247 if (TREE_CODE (t) == TREE_LIST)
3249 if (complain & tf_error)
3251 error ("lookup of %qT in %qT is ambiguous", name, context);
3252 print_candidates (t);
3254 return error_mark_node;
3257 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3259 if (complain & tf_error)
3260 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3262 return error_mark_node;
3264 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3266 if (complain & tf_error)
3267 error ("%<typename %T::%D%> names %q#T, which is not a type",
3269 return error_mark_node;
3272 if (complain & tf_error)
3273 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3275 /* If we are currently parsing a template and if T is a typedef accessed
3276 through CONTEXT then we need to remember and check access of T at
3277 template instantiation time. */
3278 add_typedef_to_current_template_for_access_check (t, context, input_location);
3281 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3283 /*entering_scope=*/0,
3284 tf_warning_or_error | tf_user);
3286 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3292 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3293 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3294 in which case error_mark_node is returned.
3296 If PARM_LIST is non-NULL, also make sure that the template parameter
3297 list of TEMPLATE_DECL matches.
3299 If COMPLAIN zero, don't complain about any errors that occur. */
3302 make_unbound_class_template (tree context, tree name, tree parm_list,
3303 tsubst_flags_t complain)
3309 name = TYPE_IDENTIFIER (name);
3310 else if (DECL_P (name))
3311 name = DECL_NAME (name);
3312 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3314 if (!dependent_type_p (context)
3315 || currently_open_class (context))
3317 tree tmpl = NULL_TREE;
3319 if (MAYBE_CLASS_TYPE_P (context))
3320 tmpl = lookup_field (context, name, 0, false);
3322 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3323 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3325 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3327 if (complain & tf_error)
3328 error ("no class template named %q#T in %q#T", name, context);
3329 return error_mark_node;
3333 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3335 if (complain & tf_error)
3337 error ("template parameters do not match template");
3338 error ("%q+D declared here", tmpl);
3340 return error_mark_node;
3343 if (complain & tf_error)
3344 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3349 /* Build the UNBOUND_CLASS_TEMPLATE. */
3350 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3351 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3352 TREE_TYPE (t) = NULL_TREE;
3353 SET_TYPE_STRUCTURAL_EQUALITY (t);
3355 /* Build the corresponding TEMPLATE_DECL. */
3356 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3357 TYPE_NAME (TREE_TYPE (d)) = d;
3358 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3359 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3360 DECL_ARTIFICIAL (d) = 1;
3361 DECL_TEMPLATE_PARMS (d) = parm_list;
3368 /* Push the declarations of builtin types into the namespace.
3369 RID_INDEX is the index of the builtin type in the array
3370 RID_POINTERS. NAME is the name used when looking up the builtin
3371 type. TYPE is the _TYPE node for the builtin type. */
3374 record_builtin_type (enum rid rid_index,
3378 tree rname = NULL_TREE, tname = NULL_TREE;
3379 tree tdecl = NULL_TREE;
3381 if ((int) rid_index < (int) RID_MAX)
3382 rname = ridpointers[(int) rid_index];
3384 tname = get_identifier (name);
3386 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3387 eliminated. Built-in types should not be looked up name; their
3388 names are keywords that the parser can recognize. However, there
3389 is code in c-common.c that uses identifier_global_value to look
3390 up built-in types by name. */
3393 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3394 DECL_ARTIFICIAL (tdecl) = 1;
3395 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3401 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3402 DECL_ARTIFICIAL (tdecl) = 1;
3404 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3407 if (!TYPE_NAME (type))
3408 TYPE_NAME (type) = tdecl;
3411 debug_hooks->type_decl (tdecl, 0);
3414 /* Record one of the standard Java types.
3415 * Declare it as having the given NAME.
3416 * If SIZE > 0, it is the size of one of the integral types;
3417 * otherwise it is the negative of the size of one of the other types. */
3420 record_builtin_java_type (const char* name, int size)
3425 type = build_nonstandard_integer_type (size, 0);
3426 type = build_distinct_type_copy (type);
3428 else if (size > -32)
3431 /* "__java_char" or ""__java_boolean". */
3432 type = build_nonstandard_integer_type (-size, 1);
3433 type = build_distinct_type_copy (type);
3434 /* Get the signed type cached and attached to the unsigned type,
3435 so it doesn't get garbage-collected at "random" times,
3436 causing potential codegen differences out of different UIDs
3437 and different alias set numbers. */
3438 stype = build_nonstandard_integer_type (-size, 0);
3439 stype = build_distinct_type_copy (stype);
3440 TREE_CHAIN (type) = stype;
3441 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3444 { /* "__java_float" or ""__java_double". */
3445 type = make_node (REAL_TYPE);
3446 TYPE_PRECISION (type) = - size;
3449 record_builtin_type (RID_MAX, name, type);
3450 decl = TYPE_NAME (type);
3452 /* Suppress generate debug symbol entries for these types,
3453 since for normal C++ they are just clutter.
3454 However, push_lang_context undoes this if extern "Java" is seen. */
3455 DECL_IGNORED_P (decl) = 1;
3457 TYPE_FOR_JAVA (type) = 1;
3461 /* Push a type into the namespace so that the back ends ignore it. */
3464 record_unknown_type (tree type, const char* name)
3466 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3467 TYPE_DECL, get_identifier (name), type));
3468 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3469 DECL_IGNORED_P (decl) = 1;
3470 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3471 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3472 TYPE_ALIGN (type) = 1;
3473 TYPE_USER_ALIGN (type) = 0;
3474 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3477 /* A string for which we should create an IDENTIFIER_NODE at
3480 typedef struct predefined_identifier
3482 /* The name of the identifier. */
3483 const char *const name;
3484 /* The place where the IDENTIFIER_NODE should be stored. */
3486 /* Nonzero if this is the name of a constructor or destructor. */
3487 const int ctor_or_dtor_p;
3488 } predefined_identifier;
3490 /* Create all the predefined identifiers. */
3493 initialize_predefined_identifiers (void)
3495 const predefined_identifier *pid;
3497 /* A table of identifiers to create at startup. */
3498 static const predefined_identifier predefined_identifiers[] = {
3499 { "C++", &lang_name_cplusplus, 0 },
3500 { "C", &lang_name_c, 0 },
3501 { "Java", &lang_name_java, 0 },
3502 /* Some of these names have a trailing space so that it is
3503 impossible for them to conflict with names written by users. */
3504 { "__ct ", &ctor_identifier, 1 },
3505 { "__base_ctor ", &base_ctor_identifier, 1 },
3506 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3507 { "__dt ", &dtor_identifier, 1 },
3508 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3509 { "__base_dtor ", &base_dtor_identifier, 1 },
3510 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3511 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3512 { "nelts", &nelts_identifier, 0 },
3513 { THIS_NAME, &this_identifier, 0 },
3514 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3515 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3516 { "_vptr", &vptr_identifier, 0 },
3517 { "__vtt_parm", &vtt_parm_identifier, 0 },
3518 { "::", &global_scope_name, 0 },
3519 { "std", &std_identifier, 0 },
3523 for (pid = predefined_identifiers; pid->name; ++pid)
3525 *pid->node = get_identifier (pid->name);
3526 if (pid->ctor_or_dtor_p)
3527 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3531 /* Create the predefined scalar types of C,
3532 and some nodes representing standard constants (0, 1, (void *)0).
3533 Initialize the global binding level.
3534 Make definitions for built-in primitive functions. */
3537 cxx_init_decl_processing (void)
3540 tree void_ftype_ptr;
3542 /* Create all the identifiers we need. */
3543 initialize_predefined_identifiers ();
3545 /* Create the global variables. */
3546 push_to_top_level ();
3548 current_function_decl = NULL_TREE;
3549 current_binding_level = NULL;
3550 /* Enter the global namespace. */
3551 gcc_assert (global_namespace == NULL_TREE);
3552 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3554 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3555 TREE_PUBLIC (global_namespace) = 1;
3556 begin_scope (sk_namespace, global_namespace);
3558 if (flag_visibility_ms_compat)
3559 default_visibility = VISIBILITY_HIDDEN;
3562 current_lang_name = lang_name_c;
3564 /* Create the `std' namespace. */
3565 push_namespace (std_identifier);
3566 std_node = current_namespace;
3569 c_common_nodes_and_builtins ();
3571 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3572 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3573 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3574 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3575 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3576 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3577 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3578 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3580 integer_two_node = build_int_cst (NULL_TREE, 2);
3582 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3583 truthvalue_type_node = boolean_type_node;
3584 truthvalue_false_node = boolean_false_node;
3585 truthvalue_true_node = boolean_true_node;
3587 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3588 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3589 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3592 record_builtin_type (RID_MAX, NULL, string_type_node);
3595 delta_type_node = ptrdiff_type_node;
3596 vtable_index_type = ptrdiff_type_node;
3598 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3599 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3600 void_ftype_ptr = build_function_type_list (void_type_node,
3601 ptr_type_node, NULL_TREE);
3603 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3605 /* C++ extensions */
3607 unknown_type_node = make_node (LANG_TYPE);
3608 record_unknown_type (unknown_type_node, "unknown type");
3610 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3611 TREE_TYPE (unknown_type_node) = unknown_type_node;
3613 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3615 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3616 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3618 init_list_type_node = make_node (LANG_TYPE);
3619 record_unknown_type (init_list_type_node, "init list");
3621 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3622 record_unknown_type (dependent_lambda_return_type_node,
3623 "undeduced lambda return type");
3626 /* Make sure we get a unique function type, so we can give
3627 its pointer type a name. (This wins for gdb.) */
3628 tree vfunc_type = make_node (FUNCTION_TYPE);
3629 TREE_TYPE (vfunc_type) = integer_type_node;
3630 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3631 layout_type (vfunc_type);
3633 vtable_entry_type = build_pointer_type (vfunc_type);
3635 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3638 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3639 layout_type (vtbl_type_node);
3640 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3641 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3642 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3643 layout_type (vtbl_ptr_type_node);
3644 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3646 push_namespace (get_identifier ("__cxxabiv1"));
3647 abi_node = current_namespace;
3650 global_type_node = make_node (LANG_TYPE);
3651 record_unknown_type (global_type_node, "global type");
3654 current_lang_name = lang_name_cplusplus;
3658 tree newtype, deltype;
3659 tree ptr_ftype_sizetype;
3663 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3664 if (cxx_dialect == cxx98)
3667 tree bad_alloc_type_node;
3668 tree bad_alloc_decl;
3670 push_namespace (std_identifier);
3671 bad_alloc_id = get_identifier ("bad_alloc");
3672 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3673 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3675 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3676 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3680 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3683 new_eh_spec = noexcept_false_spec;
3685 /* Ensure attribs.c is initialized. */
3688 = build_tree_list (get_identifier ("alloc_size"),
3689 build_tree_list (NULL_TREE, integer_one_node));
3690 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3691 newtype = build_exception_variant (newtype, new_eh_spec);
3692 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3693 push_cp_library_fn (NEW_EXPR, newtype);
3694 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3695 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3696 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3698 nullptr_type_node = make_node (NULLPTR_TYPE);
3699 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3700 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3701 TYPE_UNSIGNED (nullptr_type_node) = 1;
3702 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3703 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3704 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3705 nullptr_node = build_int_cst (nullptr_type_node, 0);
3709 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3711 /* Perform other language dependent initializations. */
3712 init_class_processing ();
3713 init_rtti_processing ();
3714 init_template_processing ();
3716 if (flag_exceptions)
3717 init_exception_processing ();
3719 if (! supports_one_only ())
3722 make_fname_decl = cp_make_fname_decl;
3723 start_fname_decls ();
3725 /* Show we use EH for cleanups. */
3726 if (flag_exceptions)
3727 using_eh_for_cleanups ();
3730 /* Generate an initializer for a function naming variable from
3731 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3732 filled in with the type of the init. */
3735 cp_fname_init (const char* name, tree *type_p)
3737 tree domain = NULL_TREE;
3739 tree init = NULL_TREE;
3744 length = strlen (name);
3745 domain = build_index_type (size_int (length));
3746 init = build_string (length + 1, name);
3749 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3750 type = build_cplus_array_type (type, domain);
3755 TREE_TYPE (init) = type;
3757 init = error_mark_node;
3762 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3763 the decl, LOC is the location to give the decl, NAME is the
3764 initialization string and TYPE_DEP indicates whether NAME depended
3765 on the type of the function. We make use of that to detect
3766 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3767 at the point of first use, so we mustn't push the decl now. */
3770 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3772 const char *const name = (type_dep && processing_template_decl
3773 ? NULL : fname_as_string (type_dep));
3775 tree init = cp_fname_init (name, &type);
3776 tree decl = build_decl (loc, VAR_DECL, id, type);
3779 free (CONST_CAST (char *, name));
3781 /* As we're using pushdecl_with_scope, we must set the context. */
3782 DECL_CONTEXT (decl) = current_function_decl;
3783 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3785 TREE_STATIC (decl) = 1;
3786 TREE_READONLY (decl) = 1;
3787 DECL_ARTIFICIAL (decl) = 1;
3789 TREE_USED (decl) = 1;
3791 if (current_function_decl)
3793 cp_binding_level *b = current_binding_level;
3794 if (b->kind == sk_function_parms)
3795 return error_mark_node;
3796 while (b->level_chain->kind != sk_function_parms)
3798 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3799 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3800 LOOKUP_ONLYCONVERTING);
3804 DECL_THIS_STATIC (decl) = true;
3805 pushdecl_top_level_and_finish (decl, init);
3812 builtin_function_1 (tree decl, tree context, bool is_global)
3814 tree id = DECL_NAME (decl);
3815 const char *name = IDENTIFIER_POINTER (id);
3817 retrofit_lang_decl (decl);
3819 DECL_ARTIFICIAL (decl) = 1;
3820 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3821 SET_DECL_LANGUAGE (decl, lang_c);
3822 /* Runtime library routines are, by definition, available in an
3823 external shared object. */
3824 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3825 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3827 DECL_CONTEXT (decl) = context;
3830 pushdecl_top_level (decl);
3834 /* A function in the user's namespace should have an explicit
3835 declaration before it is used. Mark the built-in function as
3836 anticipated but not actually declared. */
3837 if (name[0] != '_' || name[1] != '_')
3838 DECL_ANTICIPATED (decl) = 1;
3839 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3841 size_t len = strlen (name);
3843 /* Treat __*_chk fortification functions as anticipated as well,
3844 unless they are __builtin_*. */
3845 if (len > strlen ("___chk")
3846 && memcmp (name + len - strlen ("_chk"),
3847 "_chk", strlen ("_chk") + 1) == 0)
3848 DECL_ANTICIPATED (decl) = 1;
3855 cxx_builtin_function (tree decl)
3857 tree id = DECL_NAME (decl);
3858 const char *name = IDENTIFIER_POINTER (id);
3859 /* All builtins that don't begin with an '_' should additionally
3860 go in the 'std' namespace. */
3863 tree decl2 = copy_node(decl);
3864 push_namespace (std_identifier);
3865 builtin_function_1 (decl2, std_node, false);
3869 return builtin_function_1 (decl, NULL_TREE, false);
3872 /* Like cxx_builtin_function, but guarantee the function is added to the global
3873 scope. This is to allow function specific options to add new machine
3874 dependent builtins when the target ISA changes via attribute((target(...)))
3875 which saves space on program startup if the program does not use non-generic
3879 cxx_builtin_function_ext_scope (tree decl)
3882 tree id = DECL_NAME (decl);
3883 const char *name = IDENTIFIER_POINTER (id);
3884 /* All builtins that don't begin with an '_' should additionally
3885 go in the 'std' namespace. */
3888 tree decl2 = copy_node(decl);
3889 push_namespace (std_identifier);
3890 builtin_function_1 (decl2, std_node, true);
3894 return builtin_function_1 (decl, NULL_TREE, true);
3897 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3898 function. Not called directly. */
3901 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3903 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3904 DECL_EXTERNAL (fn) = 1;
3905 TREE_PUBLIC (fn) = 1;
3906 DECL_ARTIFICIAL (fn) = 1;
3907 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3908 SET_DECL_LANGUAGE (fn, lang_c);
3909 /* Runtime library routines are, by definition, available in an
3910 external shared object. */
3911 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3912 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3916 /* Returns the _DECL for a library function with C linkage.
3917 We assume that such functions never throw; if this is incorrect,
3918 callers should unset TREE_NOTHROW. */
3921 build_library_fn (tree name, tree type)
3923 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3924 TREE_NOTHROW (fn) = 1;
3928 /* Returns the _DECL for a library function with C++ linkage. */
3931 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3933 tree fn = build_library_fn_1 (name, operator_code, type);
3934 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3935 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3936 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3940 /* Like build_library_fn, but takes a C string instead of an
3944 build_library_fn_ptr (const char* name, tree type)
3946 return build_library_fn (get_identifier (name), type);
3949 /* Like build_cp_library_fn, but takes a C string instead of an
3953 build_cp_library_fn_ptr (const char* name, tree type)
3955 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3958 /* Like build_library_fn, but also pushes the function so that we will
3959 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3960 may throw exceptions listed in RAISES. */
3963 push_library_fn (tree name, tree type, tree raises)
3968 type = build_exception_variant (type, raises);
3970 fn = build_library_fn (name, type);
3971 pushdecl_top_level (fn);
3975 /* Like build_cp_library_fn, but also pushes the function so that it
3976 will be found by normal lookup. */
3979 push_cp_library_fn (enum tree_code operator_code, tree type)
3981 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3988 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3992 push_void_library_fn (tree name, tree parmtypes)
3994 tree type = build_function_type (void_type_node, parmtypes);
3995 return push_library_fn (name, type, NULL_TREE);
3998 /* Like push_library_fn, but also note that this function throws
3999 and does not return. Used for __throw_foo and the like. */
4002 push_throw_library_fn (tree name, tree type)
4004 tree fn = push_library_fn (name, type, NULL_TREE);
4005 TREE_THIS_VOLATILE (fn) = 1;
4006 TREE_NOTHROW (fn) = 0;
4010 /* When we call finish_struct for an anonymous union, we create
4011 default copy constructors and such. But, an anonymous union
4012 shouldn't have such things; this function undoes the damage to the
4013 anonymous union type T.
4015 (The reason that we create the synthesized methods is that we don't
4016 distinguish `union { int i; }' from `typedef union { int i; } U'.
4017 The first is an anonymous union; the second is just an ordinary
4021 fixup_anonymous_aggr (tree t)
4025 /* Wipe out memory of synthesized methods. */
4026 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4027 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4028 TYPE_HAS_COPY_CTOR (t) = 0;
4029 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4030 TYPE_HAS_COPY_ASSIGN (t) = 0;
4031 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4033 /* Splice the implicitly generated functions out of the TYPE_METHODS
4035 q = &TYPE_METHODS (t);
4038 if (DECL_ARTIFICIAL (*q))
4039 *q = TREE_CHAIN (*q);
4041 q = &DECL_CHAIN (*q);
4044 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4045 if (TYPE_METHODS (t))
4047 tree decl = TYPE_MAIN_DECL (t);
4049 if (TREE_CODE (t) != UNION_TYPE)
4050 error_at (DECL_SOURCE_LOCATION (decl),
4051 "an anonymous struct cannot have function members");
4053 error_at (DECL_SOURCE_LOCATION (decl),
4054 "an anonymous union cannot have function members");
4057 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4058 assignment operators (because they cannot have these methods themselves).
4059 For anonymous unions this is already checked because they are not allowed
4060 in any union, otherwise we have to check it. */
4061 if (TREE_CODE (t) != UNION_TYPE)
4065 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4066 if (TREE_CODE (field) == FIELD_DECL)
4068 type = TREE_TYPE (field);
4069 if (CLASS_TYPE_P (type))
4071 if (TYPE_NEEDS_CONSTRUCTING (type))
4072 error ("member %q+#D with constructor not allowed "
4073 "in anonymous aggregate", field);
4074 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4075 error ("member %q+#D with destructor not allowed "
4076 "in anonymous aggregate", field);
4077 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4078 error ("member %q+#D with copy assignment operator "
4079 "not allowed in anonymous aggregate", field);
4085 /* Make sure that a declaration with no declarator is well-formed, i.e.
4086 just declares a tagged type or anonymous union.
4088 Returns the type declared; or NULL_TREE if none. */
4091 check_tag_decl (cp_decl_specifier_seq *declspecs)
4093 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4094 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4095 /* If a class, struct, or enum type is declared by the DECLSPECS
4096 (i.e, if a class-specifier, enum-specifier, or non-typename
4097 elaborated-type-specifier appears in the DECLSPECS),
4098 DECLARED_TYPE is set to the corresponding type. */
4099 tree declared_type = NULL_TREE;
4100 bool error_p = false;
4102 if (declspecs->multiple_types_p)
4103 error ("multiple types in one declaration");
4104 else if (declspecs->redefined_builtin_type)
4106 if (!in_system_header)
4107 permerror (input_location, "redeclaration of C++ built-in type %qT",
4108 declspecs->redefined_builtin_type);
4113 && TYPE_P (declspecs->type)
4114 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4115 && MAYBE_CLASS_TYPE_P (declspecs->type))
4116 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4117 declared_type = declspecs->type;
4118 else if (declspecs->type == error_mark_node)
4120 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4121 permerror (input_location, "declaration does not declare anything");
4122 /* Check for an anonymous union. */
4123 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4124 && TYPE_ANONYMOUS_P (declared_type))
4126 /* 7/3 In a simple-declaration, the optional init-declarator-list
4127 can be omitted only when declaring a class (clause 9) or
4128 enumeration (7.2), that is, when the decl-specifier-seq contains
4129 either a class-specifier, an elaborated-type-specifier with
4130 a class-key (9.1), or an enum-specifier. In these cases and
4131 whenever a class-specifier or enum-specifier is present in the
4132 decl-specifier-seq, the identifiers in these specifiers are among
4133 the names being declared by the declaration (as class-name,
4134 enum-names, or enumerators, depending on the syntax). In such
4135 cases, and except for the declaration of an unnamed bit-field (9.6),
4136 the decl-specifier-seq shall introduce one or more names into the
4137 program, or shall redeclare a name introduced by a previous
4138 declaration. [Example:
4139 enum { }; // ill-formed
4140 typedef class { }; // ill-formed
4144 error ("missing type-name in typedef-declaration");
4147 /* Anonymous unions are objects, so they can have specifiers. */;
4148 SET_ANON_AGGR_TYPE_P (declared_type);
4150 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4151 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4156 if (declspecs->specs[(int)ds_inline]
4157 || declspecs->specs[(int)ds_virtual])
4158 error ("%qs can only be specified for functions",
4159 declspecs->specs[(int)ds_inline]
4160 ? "inline" : "virtual");
4162 && (!current_class_type
4163 || current_scope () != current_class_type))
4164 error ("%<friend%> can only be specified inside a class");
4165 else if (declspecs->specs[(int)ds_explicit])
4166 error ("%<explicit%> can only be specified for constructors");
4167 else if (declspecs->storage_class)
4168 error ("a storage class can only be specified for objects "
4170 else if (declspecs->specs[(int)ds_const]
4171 || declspecs->specs[(int)ds_volatile]
4172 || declspecs->specs[(int)ds_restrict]
4173 || declspecs->specs[(int)ds_thread])
4174 error ("qualifiers can only be specified for objects "
4176 else if (saw_typedef)
4177 warning (0, "%<typedef%> was ignored in this declaration");
4178 else if (declspecs->specs[(int) ds_constexpr])
4179 error ("%<constexpr%> cannot be used for type declarations");
4182 return declared_type;
4185 /* Called when a declaration is seen that contains no names to declare.
4186 If its type is a reference to a structure, union or enum inherited
4187 from a containing scope, shadow that tag name for the current scope
4188 with a forward reference.
4189 If its type defines a new named structure or union
4190 or defines an enum, it is valid but we need not do anything here.
4191 Otherwise, it is an error.
4193 C++: may have to grok the declspecs to learn about static,
4194 complain for anonymous unions.
4196 Returns the TYPE declared -- or NULL_TREE if none. */
4199 shadow_tag (cp_decl_specifier_seq *declspecs)
4201 tree t = check_tag_decl (declspecs);
4206 if (declspecs->attributes)
4208 warning (0, "attribute ignored in declaration of %q+#T", t);
4209 warning (0, "attribute for %q+#T must follow the %qs keyword",
4210 t, class_key_or_enum_as_string (t));
4214 if (maybe_process_partial_specialization (t) == error_mark_node)
4217 /* This is where the variables in an anonymous union are
4218 declared. An anonymous union declaration looks like:
4220 because there is no declarator after the union, the parser
4221 sends that declaration here. */
4222 if (ANON_AGGR_TYPE_P (t))
4224 fixup_anonymous_aggr (t);
4226 if (TYPE_FIELDS (t))
4228 tree decl = grokdeclarator (/*declarator=*/NULL,
4229 declspecs, NORMAL, 0, NULL);
4230 finish_anon_union (decl);
4237 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4240 groktypename (cp_decl_specifier_seq *type_specifiers,
4241 const cp_declarator *declarator,
4242 bool is_template_arg)
4246 enum decl_context context
4247 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4248 attrs = type_specifiers->attributes;
4249 type_specifiers->attributes = NULL_TREE;
4250 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4251 if (attrs && type != error_mark_node)
4253 if (CLASS_TYPE_P (type))
4254 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4255 "outside of definition", type);
4256 else if (MAYBE_CLASS_TYPE_P (type))
4257 /* A template type parameter or other dependent type. */
4258 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4259 "type %qT without an associated declaration", type);
4261 cplus_decl_attributes (&type, attrs, 0);
4266 /* Process a DECLARATOR for a function-scope variable declaration,
4267 namespace-scope variable declaration, or function declaration.
4268 (Function definitions go through start_function; class member
4269 declarations appearing in the body of the class go through
4270 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4271 If an error occurs, the error_mark_node is returned instead.
4273 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4274 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4275 for an explicitly defaulted function, or SD_DELETED for an explicitly
4276 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4277 implicitly initialized via a default constructor. ATTRIBUTES and
4278 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4279 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4280 set, the caller is responsible for calling pop_scope. */
4283 start_decl (const cp_declarator *declarator,
4284 cp_decl_specifier_seq *declspecs,
4287 tree prefix_attributes,
4288 tree *pushed_scope_p)
4296 *pushed_scope_p = NULL_TREE;
4298 /* An object declared as __attribute__((deprecated)) suppresses
4299 warnings of uses of other deprecated items. */
4300 if (lookup_attribute ("deprecated", attributes))
4301 deprecated_state = DEPRECATED_SUPPRESS;
4303 attributes = chainon (attributes, prefix_attributes);
4305 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4308 deprecated_state = DEPRECATED_NORMAL;
4310 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4311 || decl == error_mark_node)
4312 return error_mark_node;
4314 context = CP_DECL_CONTEXT (decl);
4315 if (context != global_namespace)
4316 *pushed_scope_p = push_scope (context);
4319 /* Is it valid for this decl to have an initializer at all?
4320 If not, set INITIALIZED to zero, which will indirectly
4321 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4322 switch (TREE_CODE (decl))
4325 error ("typedef %qD is initialized (use decltype instead)", decl);
4326 return error_mark_node;
4329 if (initialized == SD_DELETED)
4330 /* We'll handle the rest of the semantics later, but we need to
4331 set this now so it's visible to duplicate_decls. */
4332 DECL_DELETED_FN (decl) = 1;
4341 if (! toplevel_bindings_p ()
4342 && DECL_EXTERNAL (decl))
4343 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4345 DECL_EXTERNAL (decl) = 0;
4346 if (toplevel_bindings_p ())
4347 TREE_STATIC (decl) = 1;
4349 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4351 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4352 record_key_method_defined (decl);
4354 /* If this is a typedef that names the class for linkage purposes
4355 (7.1.3p8), apply any attributes directly to the type. */
4356 if (TREE_CODE (decl) == TYPE_DECL
4357 && TAGGED_TYPE_P (TREE_TYPE (decl))
4358 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4359 flags = ATTR_FLAG_TYPE_IN_PLACE;
4363 /* Set attributes here so if duplicate decl, will have proper attributes. */
4364 cplus_decl_attributes (&decl, attributes, flags);
4366 /* Dllimported symbols cannot be defined. Static data members (which
4367 can be initialized in-class and dllimported) go through grokfield,
4368 not here, so we don't need to exclude those decls when checking for
4370 if (initialized && DECL_DLLIMPORT_P (decl))
4372 error ("definition of %q#D is marked %<dllimport%>", decl);
4373 DECL_DLLIMPORT_P (decl) = 0;
4376 /* If #pragma weak was used, mark the decl weak now. */
4377 maybe_apply_pragma_weak (decl);
4379 if (TREE_CODE (decl) == FUNCTION_DECL
4380 && DECL_DECLARED_INLINE_P (decl)
4381 && DECL_UNINLINABLE (decl)
4382 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4383 warning (0, "inline function %q+D given attribute noinline", decl);
4385 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4387 if (TREE_CODE (decl) == VAR_DECL)
4389 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4390 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4391 error ("%q#D is not a static member of %q#T", decl, context);
4394 if (DECL_CONTEXT (field) != context)
4396 if (!same_type_p (DECL_CONTEXT (field), context))
4397 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4398 "to be defined as %<%T::%D%>",
4399 DECL_CONTEXT (field), DECL_NAME (decl),
4400 context, DECL_NAME (decl));
4401 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4403 if (processing_specialization
4404 && template_class_depth (context) == 0
4405 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4406 error ("template header not allowed in member definition "
4407 "of explicitly specialized class");
4408 /* Static data member are tricky; an in-class initialization
4409 still doesn't provide a definition, so the in-class
4410 declaration will have DECL_EXTERNAL set, but will have an
4411 initialization. Thus, duplicate_decls won't warn
4412 about this situation, and so we check here. */
4413 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4414 error ("duplicate initialization of %qD", decl);
4415 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4417 if (declspecs->specs[(int) ds_constexpr]
4418 && !DECL_DECLARED_CONSTEXPR_P (field))
4419 error ("%qD declared %<constexpr%> outside its class", field);
4424 tree field = check_classfn (context, decl,
4425 (processing_template_decl
4426 > template_class_depth (context))
4427 ? current_template_parms
4429 if (field && field != error_mark_node
4430 && duplicate_decls (decl, field,
4431 /*newdecl_is_friend=*/false))
4435 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4436 DECL_IN_AGGR_P (decl) = 0;
4437 /* Do not mark DECL as an explicit specialization if it was not
4438 already marked as an instantiation; a declaration should
4439 never be marked as a specialization unless we know what
4440 template is being specialized. */
4441 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4443 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4445 /* [temp.expl.spec] An explicit specialization of a static data
4446 member of a template is a definition if the declaration
4447 includes an initializer; otherwise, it is a declaration.
4449 We check for processing_specialization so this only applies
4450 to the new specialization syntax. */
4451 if (!initialized && processing_specialization)
4452 DECL_EXTERNAL (decl) = 1;
4455 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4456 /* Aliases are definitions. */
4458 permerror (input_location, "declaration of %q#D outside of class is not definition",
4462 was_public = TREE_PUBLIC (decl);
4464 /* Enter this declaration into the symbol table. */
4465 decl = maybe_push_decl (decl);
4467 if (processing_template_decl)
4468 decl = push_template_decl (decl);
4469 if (decl == error_mark_node)
4470 return error_mark_node;
4472 /* Tell the back end to use or not use .common as appropriate. If we say
4473 -fconserve-space, we want this to save .data space, at the expense of
4474 wrong semantics. If we say -fno-conserve-space, we want this to
4475 produce errors about redefs; to do this we force variables into the
4477 if (flag_conserve_space
4478 && TREE_CODE (decl) == VAR_DECL
4479 && TREE_PUBLIC (decl)
4480 && !DECL_THREAD_LOCAL_P (decl)
4481 && !have_global_bss_p ())
4482 DECL_COMMON (decl) = 1;
4484 if (TREE_CODE (decl) == VAR_DECL
4485 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4486 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4488 /* This is a const variable with implicit 'static'. Set
4489 DECL_THIS_STATIC so we can tell it from variables that are
4490 !TREE_PUBLIC because of the anonymous namespace. */
4491 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4492 DECL_THIS_STATIC (decl) = 1;
4495 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4496 start_decl_1 (decl, initialized);
4501 /* Process the declaration of a variable DECL. INITIALIZED is true
4502 iff DECL is explicitly initialized. (INITIALIZED is false if the
4503 variable is initialized via an implicitly-called constructor.)
4504 This function must be called for ordinary variables (including, for
4505 example, implicit instantiations of templates), but must not be
4506 called for template declarations. */
4509 start_decl_1 (tree decl, bool initialized)
4513 bool aggregate_definition_p;
4515 gcc_assert (!processing_template_decl);
4517 if (error_operand_p (decl))
4520 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4522 type = TREE_TYPE (decl);
4523 complete_p = COMPLETE_TYPE_P (type);
4524 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4526 /* If an explicit initializer is present, or if this is a definition
4527 of an aggregate, then we need a complete type at this point.
4528 (Scalars are always complete types, so there is nothing to
4529 check.) This code just sets COMPLETE_P; errors (if necessary)
4530 are issued below. */
4531 if ((initialized || aggregate_definition_p)
4533 && COMPLETE_TYPE_P (complete_type (type)))
4536 /* We will not yet have set TREE_READONLY on DECL if the type
4537 was "const", but incomplete, before this point. But, now, we
4538 have a complete type, so we can try again. */
4539 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4543 /* Is it valid for this decl to have an initializer at all? */
4545 /* Don't allow initializations for incomplete types except for
4546 arrays which might be completed by the initialization. */
4548 ; /* A complete type is ok. */
4549 else if (type_uses_auto (type))
4550 ; /* An auto type is ok. */
4551 else if (TREE_CODE (type) != ARRAY_TYPE)
4553 error ("variable %q#D has initializer but incomplete type", decl);
4554 type = TREE_TYPE (decl) = error_mark_node;
4556 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4558 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4559 error ("elements of array %q#D have incomplete type", decl);
4560 /* else we already gave an error in start_decl. */
4563 else if (aggregate_definition_p && !complete_p)
4565 if (type_uses_auto (type))
4566 error ("declaration of %q#D has no initializer", decl);
4568 error ("aggregate %q#D has incomplete type and cannot be defined",
4570 /* Change the type so that assemble_variable will give
4571 DECL an rtl we can live with: (mem (const_int 0)). */
4572 type = TREE_TYPE (decl) = error_mark_node;
4575 /* Create a new scope to hold this declaration if necessary.
4576 Whether or not a new scope is necessary cannot be determined
4577 until after the type has been completed; if the type is a
4578 specialization of a class template it is not until after
4579 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4580 will be set correctly. */
4581 maybe_push_cleanup_level (type);
4584 /* Handle initialization of references. DECL, TYPE, and INIT have the
4585 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4586 but will be set to a new CLEANUP_STMT if a temporary is created
4587 that must be destroyed subsequently.
4589 Returns an initializer expression to use to initialize DECL, or
4590 NULL if the initialization can be performed statically.
4592 Quotes on semantics can be found in ARM 8.4.3. */
4595 grok_reference_init (tree decl, tree type, tree init, tree *cleanup,
4600 if (init == NULL_TREE)
4602 if ((DECL_LANG_SPECIFIC (decl) == 0
4603 || DECL_IN_AGGR_P (decl) == 0)
4604 && ! DECL_THIS_EXTERN (decl))
4605 error ("%qD declared as reference but not initialized", decl);
4609 if (TREE_CODE (init) == TREE_LIST)
4610 init = build_x_compound_expr_from_list (init, ELK_INIT,
4611 tf_warning_or_error);
4613 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4614 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4615 /* Note: default conversion is only called in very special cases. */
4616 init = decay_conversion (init);
4618 /* Convert INIT to the reference type TYPE. This may involve the
4619 creation of a temporary, whose lifetime must be the same as that
4620 of the reference. If so, a DECL_EXPR for the temporary will be
4621 added just after the DECL_EXPR for DECL. That's why we don't set
4622 DECL_INITIAL for local references (instead assigning to them
4623 explicitly); we need to allow the temporary to be initialized
4625 tmp = initialize_reference (type, init, decl, cleanup, flags,
4626 tf_warning_or_error);
4627 if (DECL_DECLARED_CONSTEXPR_P (decl))
4629 tmp = cxx_constant_value (tmp);
4630 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4631 = reduced_constant_expression_p (tmp);
4634 if (tmp == error_mark_node)
4636 else if (tmp == NULL_TREE)
4638 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4642 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4645 DECL_INITIAL (decl) = tmp;
4650 /* Subroutine of check_initializer. We're initializing a DECL of
4651 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4652 extend the lifetime of the underlying array to match that of the decl,
4653 just like for reference initialization. CLEANUP is as for
4654 grok_reference_init. */
4657 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4660 tree aggr_init, array, arrtype;
4661 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4662 if (error_operand_p (init))
4663 return error_mark_node;
4665 aggr_init = TARGET_EXPR_INITIAL (init);
4666 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4667 arrtype = TREE_TYPE (array);
4669 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4670 array = TREE_OPERAND (array, 0);
4671 /* If the array is constant, finish_compound_literal already made it a
4672 static variable and we don't need to do anything here. */
4673 if (decl && TREE_CODE (array) == TARGET_EXPR)
4675 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4676 var = build_address (var);
4677 var = convert (arrtype, var);
4678 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4683 /* Designated initializers in arrays are not supported in GNU C++.
4684 The parser cannot detect this error since it does not know whether
4685 a given brace-enclosed initializer is for a class type or for an
4686 array. This function checks that CE does not use a designated
4687 initializer. If it does, an error is issued. Returns true if CE
4688 is valid, i.e., does not have a designated initializer. */
4691 check_array_designated_initializer (const constructor_elt *ce,
4692 unsigned HOST_WIDE_INT index)
4694 /* Designated initializers for array elements are not supported. */
4697 /* The parser only allows identifiers as designated
4699 if (ce->index == error_mark_node)
4700 error ("name used in a GNU-style designated "
4701 "initializer for an array");
4702 else if (TREE_CODE (ce->index) == INTEGER_CST)
4704 /* A C99 designator is OK if it matches the current index. */
4705 if (TREE_INT_CST_LOW (ce->index) == index)
4708 sorry ("non-trivial designated initializers not supported");
4712 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4713 error ("name %qD used in a GNU-style designated "
4714 "initializer for an array", ce->index);
4722 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4723 array until we finish parsing the initializer. If that's the
4724 situation we're in, update DECL accordingly. */
4727 maybe_deduce_size_from_array_init (tree decl, tree init)
4729 tree type = TREE_TYPE (decl);
4731 if (TREE_CODE (type) == ARRAY_TYPE
4732 && TYPE_DOMAIN (type) == NULL_TREE
4733 && TREE_CODE (decl) != TYPE_DECL)
4735 /* do_default is really a C-ism to deal with tentative definitions.
4736 But let's leave it here to ease the eventual merge. */
4737 int do_default = !DECL_EXTERNAL (decl);
4738 tree initializer = init ? init : DECL_INITIAL (decl);
4741 /* Check that there are no designated initializers in INIT, as
4742 those are not supported in GNU C++, and as the middle-end
4743 will crash if presented with a non-numeric designated
4745 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4747 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4748 constructor_elt *ce;
4750 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4751 if (!check_array_designated_initializer (ce, i))
4757 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4761 error ("initializer fails to determine size of %qD", decl);
4762 TREE_TYPE (decl) = error_mark_node;
4764 else if (failure == 2)
4768 error ("array size missing in %qD", decl);
4769 TREE_TYPE (decl) = error_mark_node;
4771 /* If a `static' var's size isn't known, make it extern as
4772 well as static, so it does not get allocated. If it's not
4773 `static', then don't mark it extern; finish_incomplete_decl
4774 will give it a default size and it will get allocated. */
4775 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4776 DECL_EXTERNAL (decl) = 1;
4778 else if (failure == 3)
4780 error ("zero-size array %qD", decl);
4781 TREE_TYPE (decl) = error_mark_node;
4785 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4787 relayout_decl (decl);
4791 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4792 any appropriate error messages regarding the layout. */
4795 layout_var_decl (tree decl)
4799 type = TREE_TYPE (decl);
4800 if (type == error_mark_node)
4803 /* If we haven't already layed out this declaration, do so now.
4804 Note that we must not call complete type for an external object
4805 because it's type might involve templates that we are not
4806 supposed to instantiate yet. (And it's perfectly valid to say
4807 `extern X x' for some incomplete type `X'.) */
4808 if (!DECL_EXTERNAL (decl))
4809 complete_type (type);
4810 if (!DECL_SIZE (decl)
4811 && TREE_TYPE (decl) != error_mark_node
4812 && (COMPLETE_TYPE_P (type)
4813 || (TREE_CODE (type) == ARRAY_TYPE
4814 && !TYPE_DOMAIN (type)
4815 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4816 layout_decl (decl, 0);
4818 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4820 /* An automatic variable with an incomplete type: that is an error.
4821 Don't talk about array types here, since we took care of that
4822 message in grokdeclarator. */
4823 error ("storage size of %qD isn%'t known", decl);
4824 TREE_TYPE (decl) = error_mark_node;
4827 /* Keep this code around in case we later want to control debug info
4828 based on whether a type is "used". (jason 1999-11-11) */
4830 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4831 /* Let debugger know it should output info for this type. */
4832 note_debug_info_needed (ttype);
4834 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4835 note_debug_info_needed (DECL_CONTEXT (decl));
4838 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4839 && DECL_SIZE (decl) != NULL_TREE
4840 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4842 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4843 constant_expression_warning (DECL_SIZE (decl));
4846 error ("storage size of %qD isn%'t constant", decl);
4847 TREE_TYPE (decl) = error_mark_node;
4852 /* If a local static variable is declared in an inline function, or if
4853 we have a weak definition, we must endeavor to create only one
4854 instance of the variable at link-time. */
4857 maybe_commonize_var (tree decl)
4859 /* Static data in a function with comdat linkage also has comdat
4861 if (TREE_STATIC (decl)
4862 /* Don't mess with __FUNCTION__. */
4863 && ! DECL_ARTIFICIAL (decl)
4864 && DECL_FUNCTION_SCOPE_P (decl)
4865 && vague_linkage_p (DECL_CONTEXT (decl)))
4869 /* With weak symbols, we simply make the variable COMDAT;
4870 that will cause copies in multiple translations units to
4872 comdat_linkage (decl);
4876 if (DECL_INITIAL (decl) == NULL_TREE
4877 || DECL_INITIAL (decl) == error_mark_node)
4879 /* Without weak symbols, we can use COMMON to merge
4880 uninitialized variables. */
4881 TREE_PUBLIC (decl) = 1;
4882 DECL_COMMON (decl) = 1;
4886 /* While for initialized variables, we must use internal
4887 linkage -- which means that multiple copies will not
4889 TREE_PUBLIC (decl) = 0;
4890 DECL_COMMON (decl) = 0;
4891 warning_at (input_location, 0,
4892 "sorry: semantics of inline function static "
4893 "data %q+#D are wrong (you%'ll wind up "
4894 "with multiple copies)", decl);
4895 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4896 " you can work around this by removing "
4901 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4902 /* Set it up again; we might have set DECL_INITIAL since the last
4904 comdat_linkage (decl);
4907 /* Issue an error message if DECL is an uninitialized const variable. */
4910 check_for_uninitialized_const_var (tree decl)
4912 tree type = strip_array_types (TREE_TYPE (decl));
4914 /* ``Unless explicitly declared extern, a const object does not have
4915 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4917 if (TREE_CODE (decl) == VAR_DECL
4918 && TREE_CODE (type) != REFERENCE_TYPE
4919 && CP_TYPE_CONST_P (type)
4920 && !DECL_INITIAL (decl))
4922 tree field = default_init_uninitialized_part (type);
4926 permerror (DECL_SOURCE_LOCATION (decl),
4927 "uninitialized const %qD", decl);
4929 if (CLASS_TYPE_P (type))
4931 tree defaulted_ctor;
4933 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4934 "%q#T has no user-provided default constructor", type);
4935 defaulted_ctor = in_class_defaulted_default_constructor (type);
4937 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4938 "constructor is not user-provided because it is "
4939 "explicitly defaulted in the class body");
4940 inform (0, "and the implicitly-defined constructor does not "
4941 "initialize %q+#D", field);
4946 /* Structure holding the current initializer being processed by reshape_init.
4947 CUR is a pointer to the current element being processed, END is a pointer
4948 after the last element present in the initializer. */
4949 typedef struct reshape_iterator_t
4951 constructor_elt *cur;
4952 constructor_elt *end;
4955 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4957 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4958 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4959 initialized. If there are no more such fields, the return value
4963 next_initializable_field (tree field)
4966 && (TREE_CODE (field) != FIELD_DECL
4967 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4968 || DECL_ARTIFICIAL (field)))
4969 field = DECL_CHAIN (field);
4974 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4975 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4976 INTEGER_CST representing the size of the array minus one (the maximum index),
4977 or NULL_TREE if the array was declared without specifying the size. D is
4978 the iterator within the constructor. */
4981 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4982 tsubst_flags_t complain)
4985 bool sized_array_p = (max_index != NULL_TREE);
4986 unsigned HOST_WIDE_INT max_index_cst = 0;
4987 unsigned HOST_WIDE_INT index;
4989 /* The initializer for an array is always a CONSTRUCTOR. */
4990 new_init = build_constructor (init_list_type_node, NULL);
4994 /* Minus 1 is used for zero sized arrays. */
4995 if (integer_all_onesp (max_index))
4998 if (host_integerp (max_index, 1))
4999 max_index_cst = tree_low_cst (max_index, 1);
5000 /* sizetype is sign extended, not zero extended. */
5002 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
5006 /* Loop until there are no more initializers. */
5008 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5013 check_array_designated_initializer (d->cur, index);
5014 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5016 if (elt_init == error_mark_node)
5017 return error_mark_node;
5018 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5019 size_int (index), elt_init);
5020 if (!TREE_CONSTANT (elt_init))
5021 TREE_CONSTANT (new_init) = false;
5027 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5028 Parameters are the same of reshape_init_r. */
5031 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5033 tree max_index = NULL_TREE;
5035 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5037 if (TYPE_DOMAIN (type))
5038 max_index = array_type_nelts (type);
5040 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5043 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5044 Parameters are the same of reshape_init_r. */
5047 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5049 tree max_index = NULL_TREE;
5051 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5053 if (COMPOUND_LITERAL_P (d->cur->value))
5055 tree value = d->cur->value;
5056 if (!same_type_p (TREE_TYPE (value), type))
5058 if (complain & tf_error)
5059 error ("invalid type %qT as initializer for a vector of type %qT",
5060 TREE_TYPE (d->cur->value), type);
5061 value = error_mark_node;
5067 /* For a vector, we initialize it as an array of the appropriate size. */
5068 if (TREE_CODE (type) == VECTOR_TYPE)
5069 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5071 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5074 /* Subroutine of reshape_init_r, processes the initializers for classes
5075 or union. Parameters are the same of reshape_init_r. */
5078 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5079 tsubst_flags_t complain)
5084 gcc_assert (CLASS_TYPE_P (type));
5086 /* The initializer for a class is always a CONSTRUCTOR. */
5087 new_init = build_constructor (init_list_type_node, NULL);
5088 field = next_initializable_field (TYPE_FIELDS (type));
5094 An initializer for an aggregate member that is an
5095 empty class shall have the form of an empty
5096 initializer-list {}. */
5097 if (!first_initializer_p)
5099 if (complain & tf_error)
5100 error ("initializer for %qT must be brace-enclosed", type);
5101 return error_mark_node;
5106 /* Loop through the initializable fields, gathering initializers. */
5107 while (d->cur != d->end)
5111 /* Handle designated initializers, as an extension. */
5114 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5116 if (!field || TREE_CODE (field) != FIELD_DECL)
5118 if (complain & tf_error)
5119 error ("%qT has no non-static data member named %qD", type,
5121 return error_mark_node;
5125 /* If we processed all the member of the class, we are done. */
5129 field_init = reshape_init_r (TREE_TYPE (field), d,
5130 /*first_initializer_p=*/false, complain);
5131 if (field_init == error_mark_node)
5132 return error_mark_node;
5134 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5138 When a union is initialized with a brace-enclosed
5139 initializer, the braces shall only contain an
5140 initializer for the first member of the union. */
5141 if (TREE_CODE (type) == UNION_TYPE)
5144 field = next_initializable_field (DECL_CHAIN (field));
5150 /* Subroutine of reshape_init, which processes a single initializer (part of
5151 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5152 iterator within the CONSTRUCTOR which points to the initializer to process.
5153 FIRST_INITIALIZER_P is true if this is the first initializer of the
5154 outermost CONSTRUCTOR node. */
5157 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5158 tsubst_flags_t complain)
5160 tree init = d->cur->value;
5162 if (error_operand_p (init))
5163 return error_mark_node;
5165 if (TREE_CODE (type) == COMPLEX_TYPE)
5167 /* A complex type can be initialized from one or two initializers,
5168 but braces are not elided. */
5170 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5172 if (CONSTRUCTOR_NELTS (init) > 2)
5174 if (complain & tf_error)
5175 error ("too many initializers for %qT", type);
5177 return error_mark_node;
5180 else if (first_initializer_p && d->cur != d->end)
5182 VEC(constructor_elt, gc) *v = 0;
5183 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5184 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5186 init = build_constructor (init_list_type_node, v);
5191 /* A non-aggregate type is always initialized with a single
5193 if (!CP_AGGREGATE_TYPE_P (type))
5195 /* It is invalid to initialize a non-aggregate type with a
5196 brace-enclosed initializer before C++0x.
5197 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5198 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5199 a CONSTRUCTOR (with a record type). */
5200 if (TREE_CODE (init) == CONSTRUCTOR
5201 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5203 if (SCALAR_TYPE_P (type))
5205 if (complain & tf_error)
5206 error ("braces around scalar initializer for type %qT", type);
5207 init = error_mark_node;
5210 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5219 All implicit type conversions (clause _conv_) are considered when
5220 initializing the aggregate member with an initializer from an
5221 initializer-list. If the initializer can initialize a member,
5222 the member is initialized. Otherwise, if the member is itself a
5223 non-empty subaggregate, brace elision is assumed and the
5224 initializer is considered for the initialization of the first
5225 member of the subaggregate. */
5226 if (TREE_CODE (init) != CONSTRUCTOR
5227 /* But don't try this for the first initializer, since that would be
5228 looking through the outermost braces; A a2 = { a1 }; is not a
5229 valid aggregate initialization. */
5230 && !first_initializer_p
5231 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5232 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5238 /* [dcl.init.string]
5240 A char array (whether plain char, signed char, or unsigned char)
5241 can be initialized by a string-literal (optionally enclosed in
5242 braces); a wchar_t array can be initialized by a wide
5243 string-literal (optionally enclosed in braces). */
5244 if (TREE_CODE (type) == ARRAY_TYPE
5245 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5247 tree str_init = init;
5249 /* Strip one level of braces if and only if they enclose a single
5250 element (as allowed by [dcl.init.string]). */
5251 if (!first_initializer_p
5252 && TREE_CODE (str_init) == CONSTRUCTOR
5253 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5255 str_init = VEC_index (constructor_elt,
5256 CONSTRUCTOR_ELTS (str_init), 0)->value;
5259 /* If it's a string literal, then it's the initializer for the array
5260 as a whole. Otherwise, continue with normal initialization for
5261 array types (one value per array element). */
5262 if (TREE_CODE (str_init) == STRING_CST)
5269 /* The following cases are about aggregates. If we are not within a full
5270 initializer already, and there is not a CONSTRUCTOR, it means that there
5271 is a missing set of braces (that is, we are processing the case for
5272 which reshape_init exists). */
5273 if (!first_initializer_p)
5275 if (TREE_CODE (init) == CONSTRUCTOR)
5277 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5278 /* There is no need to reshape pointer-to-member function
5279 initializers, as they are always constructed correctly
5280 by the front end. */
5282 else if (COMPOUND_LITERAL_P (init))
5283 /* For a nested compound literal, there is no need to reshape since
5284 brace elision is not allowed. Even if we decided to allow it,
5285 we should add a call to reshape_init in finish_compound_literal,
5286 before calling digest_init, so changing this code would still
5287 not be necessary. */
5288 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5292 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5293 return reshape_init (type, init, complain);
5297 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5301 /* Dispatch to specialized routines. */
5302 if (CLASS_TYPE_P (type))
5303 return reshape_init_class (type, d, first_initializer_p, complain);
5304 else if (TREE_CODE (type) == ARRAY_TYPE)
5305 return reshape_init_array (type, d, complain);
5306 else if (TREE_CODE (type) == VECTOR_TYPE)
5307 return reshape_init_vector (type, d, complain);
5312 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5313 brace-enclosed aggregate initializer.
5315 INIT is the CONSTRUCTOR containing the list of initializers describing
5316 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5317 It may not presently match the shape of the TYPE; for example:
5319 struct S { int a; int b; };
5320 struct S a[] = { 1, 2, 3, 4 };
5322 Here INIT will hold a VEC of four elements, rather than a
5323 VEC of two elements, each itself a VEC of two elements. This
5324 routine transforms INIT from the former form into the latter. The
5325 revised CONSTRUCTOR node is returned. */
5328 reshape_init (tree type, tree init, tsubst_flags_t complain)
5330 VEC(constructor_elt, gc) *v;
5334 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5336 v = CONSTRUCTOR_ELTS (init);
5338 /* An empty constructor does not need reshaping, and it is always a valid
5340 if (VEC_empty (constructor_elt, v))
5343 /* Recurse on this CONSTRUCTOR. */
5344 d.cur = VEC_index (constructor_elt, v, 0);
5345 d.end = d.cur + VEC_length (constructor_elt, v);
5347 new_init = reshape_init_r (type, &d, true, complain);
5348 if (new_init == error_mark_node)
5349 return error_mark_node;
5351 /* Make sure all the element of the constructor were used. Otherwise,
5352 issue an error about exceeding initializers. */
5355 if (complain & tf_error)
5356 error ("too many initializers for %qT", type);
5358 return error_mark_node;
5364 /* Verify array initializer. Returns true if errors have been reported. */
5367 check_array_initializer (tree decl, tree type, tree init)
5369 tree element_type = TREE_TYPE (type);
5371 /* The array type itself need not be complete, because the
5372 initializer may tell us how many elements are in the array.
5373 But, the elements of the array must be complete. */
5374 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5377 error ("elements of array %q#D have incomplete type", decl);
5379 error ("elements of array %q#T have incomplete type", type);
5382 /* It is not valid to initialize a VLA. */
5384 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5385 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5388 error ("variable-sized object %qD may not be initialized", decl);
5390 error ("variable-sized compound literal");
5396 /* Subroutine of check_initializer; args are passed down from that function.
5397 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5400 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5403 int saved_stmts_are_full_exprs_p = 0;
5404 if (building_stmt_list_p ())
5406 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5407 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5409 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5410 if (building_stmt_list_p ())
5411 current_stmt_tree ()->stmts_are_full_exprs_p =
5412 saved_stmts_are_full_exprs_p;
5416 /* Verify INIT (the initializer for DECL), and record the
5417 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5418 grok_reference_init.
5420 If the return value is non-NULL, it is an expression that must be
5421 evaluated dynamically to initialize DECL. */
5424 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5426 tree type = TREE_TYPE (decl);
5427 tree init_code = NULL;
5428 tree extra_init = NULL_TREE;
5431 /* Things that are going to be initialized need to have complete
5433 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5435 if (DECL_HAS_VALUE_EXPR_P (decl))
5437 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5438 it doesn't have storage to be initialized. */
5439 gcc_assert (init == NULL_TREE);
5443 if (type == error_mark_node)
5444 /* We will have already complained. */
5447 if (TREE_CODE (type) == ARRAY_TYPE)
5449 if (check_array_initializer (decl, type, init))
5452 else if (!COMPLETE_TYPE_P (type))
5454 error ("%qD has incomplete type", decl);
5455 TREE_TYPE (decl) = error_mark_node;
5459 /* There is no way to make a variable-sized class type in GNU C++. */
5460 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5462 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5464 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5465 if (SCALAR_TYPE_P (type))
5469 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5470 init = build_zero_init (type, NULL_TREE, false);
5472 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5474 error ("scalar object %qD requires one element in initializer",
5476 TREE_TYPE (decl) = error_mark_node;
5482 if (TREE_CODE (decl) == CONST_DECL)
5484 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5486 DECL_INITIAL (decl) = init;
5488 gcc_assert (init != NULL_TREE);
5491 else if (!init && DECL_REALLY_EXTERN (decl))
5493 else if (TREE_CODE (type) == REFERENCE_TYPE)
5494 init = grok_reference_init (decl, type, init, cleanup, flags);
5495 else if (init || type_build_ctor_call (type))
5498 check_for_uninitialized_const_var (decl);
5499 /* Do not reshape constructors of vectors (they don't need to be
5501 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5503 if (is_std_init_list (type))
5504 init = build_init_list_var_init (decl, type, init,
5505 &extra_init, cleanup);
5506 else if (TYPE_NON_AGGREGATE_CLASS (type))
5508 /* Don't reshape if the class has constructors. */
5509 if (cxx_dialect == cxx98)
5510 error ("in C++98 %qD must be initialized by constructor, "
5514 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5516 error ("opaque vector types cannot be initialized");
5517 init = error_mark_node;
5521 init = reshape_init (type, init, tf_warning_or_error);
5522 if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
5523 check_narrowing (type, init);
5527 /* If DECL has an array type without a specific bound, deduce the
5528 array size from the initializer. */
5529 maybe_deduce_size_from_array_init (decl, init);
5530 type = TREE_TYPE (decl);
5531 if (type == error_mark_node)
5534 if (type_build_ctor_call (type)
5535 || (CLASS_TYPE_P (type)
5536 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5538 init_code = build_aggr_init_full_exprs (decl, init, flags);
5540 /* If this is a constexpr initializer, expand_default_init will
5541 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5542 case, pull the initializer back out and pass it down into
5543 store_init_value. */
5544 while (TREE_CODE (init_code) == EXPR_STMT
5545 || TREE_CODE (init_code) == CONVERT_EXPR)
5546 init_code = TREE_OPERAND (init_code, 0);
5547 if (TREE_CODE (init_code) == INIT_EXPR)
5549 init = TREE_OPERAND (init_code, 1);
5550 init_code = NULL_TREE;
5551 /* Don't call digest_init; it's unnecessary and will complain
5552 about aggregate initialization of non-aggregate classes. */
5553 flags |= LOOKUP_ALREADY_DIGESTED;
5555 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5557 /* Declared constexpr, but no suitable initializer; massage
5558 init appropriately so we can pass it into store_init_value
5560 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5561 init = finish_compound_literal (type, init,
5562 tf_warning_or_error);
5563 else if (CLASS_TYPE_P (type)
5564 && (!init || TREE_CODE (init) == TREE_LIST))
5566 init = build_functional_cast (type, init, tf_none);
5567 if (init != error_mark_node)
5568 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5570 init_code = NULL_TREE;
5576 if (init && TREE_CODE (init) != TREE_VEC)
5578 init_code = store_init_value (decl, init, flags);
5579 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5580 && DECL_INITIAL (decl)
5581 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5582 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5583 warning (0, "array %qD initialized by parenthesized string literal %qE",
5584 decl, DECL_INITIAL (decl));
5590 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5591 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5592 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5593 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5596 check_for_uninitialized_const_var (decl);
5599 if (init && init != error_mark_node)
5600 init_code = build2 (INIT_EXPR, type, decl, init);
5603 init_code = add_stmt_to_compound (extra_init, init_code);
5605 if (init_code && DECL_IN_AGGR_P (decl))
5607 static int explained = 0;
5609 if (cxx_dialect < cxx0x)
5610 error ("initializer invalid for static member with constructor");
5612 error ("non-constant in-class initialization invalid for static "
5613 "member %qD", decl);
5616 error ("(an out of class initialization is required)");
5624 /* If DECL is not a local variable, give it RTL. */
5627 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5629 int toplev = toplevel_bindings_p ();
5631 const char *filename;
5633 /* Set the DECL_ASSEMBLER_NAME for the object. */
5636 /* The `register' keyword, when used together with an
5637 asm-specification, indicates that the variable should be
5638 placed in a particular register. */
5639 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5641 set_user_assembler_name (decl, asmspec);
5642 DECL_HARD_REGISTER (decl) = 1;
5646 if (TREE_CODE (decl) == FUNCTION_DECL
5647 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5648 set_builtin_user_assembler_name (decl, asmspec);
5649 set_user_assembler_name (decl, asmspec);
5653 /* Handle non-variables up front. */
5654 if (TREE_CODE (decl) != VAR_DECL)
5656 rest_of_decl_compilation (decl, toplev, at_eof);
5660 /* If we see a class member here, it should be a static data
5662 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5664 gcc_assert (TREE_STATIC (decl));
5665 /* An in-class declaration of a static data member should be
5666 external; it is only a declaration, and not a definition. */
5667 if (init == NULL_TREE)
5668 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5671 /* We don't create any RTL for local variables. */
5672 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5675 /* We defer emission of local statics until the corresponding
5676 DECL_EXPR is expanded. */
5677 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5679 /* We try to defer namespace-scope static constants so that they are
5680 not emitted into the object file unnecessarily. */
5681 filename = input_filename;
5682 if (!DECL_VIRTUAL_P (decl)
5683 && TREE_READONLY (decl)
5684 && DECL_INITIAL (decl) != NULL_TREE
5685 && DECL_INITIAL (decl) != error_mark_node
5687 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5689 && !TREE_PUBLIC (decl))
5691 /* Fool with the linkage of static consts according to #pragma
5693 struct c_fileinfo *finfo = get_fileinfo (filename);
5694 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5696 TREE_PUBLIC (decl) = 1;
5697 DECL_EXTERNAL (decl) = finfo->interface_only;
5702 /* Likewise for template instantiations. */
5703 else if (DECL_LANG_SPECIFIC (decl)
5704 && DECL_IMPLICIT_INSTANTIATION (decl))
5707 /* If we're not deferring, go ahead and assemble the variable. */
5709 rest_of_decl_compilation (decl, toplev, at_eof);
5712 /* walk_tree helper for wrap_temporary_cleanups, below. */
5715 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5717 if (TYPE_P (*stmt_p))
5723 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5725 tree guard = (tree)data;
5726 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5728 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5729 /* Tell honor_protect_cleanup_actions to handle this as a separate
5731 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5733 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5739 /* We're initializing a local variable which has a cleanup GUARD. If there
5740 are any temporaries used in the initializer INIT of this variable, we
5741 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5742 variable will be cleaned up properly if one of them throws.
5744 Unfortunately, there's no way to express this properly in terms of
5745 nesting, as the regions for the temporaries overlap the region for the
5746 variable itself; if there are two temporaries, the variable needs to be
5747 the first thing destroyed if either of them throws. However, we only
5748 want to run the variable's cleanup if it actually got constructed. So
5749 we need to guard the temporary cleanups with the variable's cleanup if
5750 they are run on the normal path, but not if they are run on the
5751 exceptional path. We implement this by telling
5752 honor_protect_cleanup_actions to strip the variable cleanup from the
5753 exceptional path. */
5756 wrap_temporary_cleanups (tree init, tree guard)
5758 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5761 /* Generate code to initialize DECL (a local variable). */
5764 initialize_local_var (tree decl, tree init)
5766 tree type = TREE_TYPE (decl);
5770 gcc_assert (TREE_CODE (decl) == VAR_DECL
5771 || TREE_CODE (decl) == RESULT_DECL);
5772 gcc_assert (!TREE_STATIC (decl));
5774 if (DECL_SIZE (decl) == NULL_TREE)
5776 /* If we used it already as memory, it must stay in memory. */
5777 DECL_INITIAL (decl) = NULL_TREE;
5778 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5782 if (type == error_mark_node)
5785 /* Compute and store the initial value. */
5786 already_used = TREE_USED (decl) || TREE_USED (type);
5787 if (TREE_USED (type))
5788 DECL_READ_P (decl) = 1;
5790 /* Generate a cleanup, if necessary. */
5791 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5793 /* Perform the initialization. */
5796 if (TREE_CODE (init) == INIT_EXPR
5797 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5799 /* Stick simple initializers in DECL_INITIAL so that
5800 -Wno-init-self works (c++/34772). */
5801 gcc_assert (TREE_OPERAND (init, 0) == decl);
5802 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5806 int saved_stmts_are_full_exprs_p;
5808 /* If we're only initializing a single object, guard the
5809 destructors of any temporaries used in its initializer with
5810 its destructor. This isn't right for arrays because each
5811 element initialization is a full-expression. */
5812 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5813 wrap_temporary_cleanups (init, cleanup);
5815 gcc_assert (building_stmt_list_p ());
5816 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5817 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5818 finish_expr_stmt (init);
5819 current_stmt_tree ()->stmts_are_full_exprs_p =
5820 saved_stmts_are_full_exprs_p;
5824 /* Set this to 0 so we can tell whether an aggregate which was
5825 initialized was ever used. Don't do this if it has a
5826 destructor, so we don't complain about the 'resource
5827 allocation is initialization' idiom. Now set
5828 attribute((unused)) on types so decls of that type will be
5829 marked used. (see TREE_USED, above.) */
5830 if (TYPE_NEEDS_CONSTRUCTING (type)
5832 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5833 && DECL_NAME (decl))
5834 TREE_USED (decl) = 0;
5835 else if (already_used)
5836 TREE_USED (decl) = 1;
5839 finish_decl_cleanup (decl, cleanup);
5842 /* DECL is a VAR_DECL for a compiler-generated variable with static
5843 storage duration (like a virtual table) whose initializer is a
5844 compile-time constant. Initialize the variable and provide it to the
5848 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5851 gcc_assert (DECL_ARTIFICIAL (decl));
5852 init = build_constructor (TREE_TYPE (decl), v);
5853 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5854 DECL_INITIAL (decl) = init;
5855 DECL_INITIALIZED_P (decl) = 1;
5856 determine_visibility (decl);
5857 layout_var_decl (decl);
5858 maybe_commonize_var (decl);
5859 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5862 /* INIT is the initializer for a variable, as represented by the
5863 parser. Returns true iff INIT is type-dependent. */
5866 type_dependent_init_p (tree init)
5868 if (TREE_CODE (init) == TREE_LIST)
5869 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5870 return any_type_dependent_elements_p (init);
5871 else if (TREE_CODE (init) == CONSTRUCTOR)
5872 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5874 VEC(constructor_elt, gc) *elts;
5878 elts = CONSTRUCTOR_ELTS (init);
5879 nelts = VEC_length (constructor_elt, elts);
5880 for (i = 0; i < nelts; ++i)
5881 if (type_dependent_init_p (VEC_index (constructor_elt,
5886 /* It must be a simple expression, e.g., int i = 3; */
5887 return type_dependent_expression_p (init);
5892 /* INIT is the initializer for a variable, as represented by the
5893 parser. Returns true iff INIT is value-dependent. */
5896 value_dependent_init_p (tree init)
5898 if (TREE_CODE (init) == TREE_LIST)
5899 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5900 return any_value_dependent_elements_p (init);
5901 else if (TREE_CODE (init) == CONSTRUCTOR)
5902 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5904 VEC(constructor_elt, gc) *elts;
5908 elts = CONSTRUCTOR_ELTS (init);
5909 nelts = VEC_length (constructor_elt, elts);
5910 for (i = 0; i < nelts; ++i)
5911 if (value_dependent_init_p (VEC_index (constructor_elt,
5916 /* It must be a simple expression, e.g., int i = 3; */
5917 return value_dependent_expression_p (init);
5922 /* Finish processing of a declaration;
5923 install its line number and initial value.
5924 If the length of an array type is not known before,
5925 it must be determined now, from the initial value, or it is an error.
5927 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5928 true, then INIT is an integral constant expression.
5930 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5931 if the (init) syntax was used. */
5934 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5935 tree asmspec_tree, int flags)
5939 const char *asmspec = NULL;
5940 int was_readonly = 0;
5941 bool var_definition_p = false;
5944 if (decl == error_mark_node)
5949 error ("assignment (not initialization) in declaration");
5953 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5954 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5955 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5957 type = TREE_TYPE (decl);
5958 if (type == error_mark_node)
5961 /* Assume no cleanup is required. */
5962 cleanup = NULL_TREE;
5964 /* If a name was specified, get the string. */
5965 if (at_namespace_scope_p ())
5966 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5967 if (asmspec_tree && asmspec_tree != error_mark_node)
5968 asmspec = TREE_STRING_POINTER (asmspec_tree);
5970 if (current_class_type
5971 && CP_DECL_CONTEXT (decl) == current_class_type
5972 && TYPE_BEING_DEFINED (current_class_type)
5973 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5974 && (DECL_INITIAL (decl) || init))
5975 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5977 auto_node = type_uses_auto (type);
5981 if (init == NULL_TREE)
5983 error ("declaration of %q#D has no initializer", decl);
5984 TREE_TYPE (decl) = error_mark_node;
5988 if (TREE_CODE (d_init) == TREE_LIST)
5989 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5990 tf_warning_or_error);
5991 d_init = resolve_nondeduced_context (d_init);
5992 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5994 if (type == error_mark_node)
5998 if (!ensure_literal_type_for_constexpr_object (decl))
5999 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6001 if (TREE_CODE (decl) == VAR_DECL
6002 && DECL_CLASS_SCOPE_P (decl)
6003 && DECL_INITIALIZED_IN_CLASS_P (decl))
6004 check_static_variable_definition (decl, type);
6006 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6009 if (init == ridpointers[(int)RID_DELETE])
6011 /* FIXME check this is 1st decl. */
6012 DECL_DELETED_FN (decl) = 1;
6013 DECL_DECLARED_INLINE_P (decl) = 1;
6014 DECL_INITIAL (decl) = error_mark_node;
6015 FOR_EACH_CLONE (clone, decl)
6017 DECL_DELETED_FN (clone) = 1;
6018 DECL_DECLARED_INLINE_P (clone) = 1;
6019 DECL_INITIAL (clone) = error_mark_node;
6023 else if (init == ridpointers[(int)RID_DEFAULT])
6025 if (defaultable_fn_check (decl))
6026 DECL_DEFAULTED_FN (decl) = 1;
6028 DECL_INITIAL (decl) = NULL_TREE;
6032 if (init && TREE_CODE (decl) == VAR_DECL)
6034 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6035 /* If DECL is a reference, then we want to know whether init is a
6036 reference constant; init_const_expr_p as passed tells us whether
6037 it's an rvalue constant. */
6038 if (TREE_CODE (type) == REFERENCE_TYPE)
6039 init_const_expr_p = potential_constant_expression (init);
6040 if (init_const_expr_p)
6042 /* Set these flags now for templates. We'll update the flags in
6043 store_init_value for instantiations. */
6044 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6045 if (decl_maybe_constant_var_p (decl))
6046 TREE_CONSTANT (decl) = 1;
6050 if (processing_template_decl)
6052 bool type_dependent_p;
6054 /* Add this declaration to the statement-tree. */
6055 if (at_function_scope_p ())
6056 add_decl_expr (decl);
6058 type_dependent_p = dependent_type_p (type);
6060 if (check_for_bare_parameter_packs (init))
6063 DECL_INITIAL (decl) = NULL_TREE;
6066 /* Generally, initializers in templates are expanded when the
6067 template is instantiated. But, if DECL is a variable constant
6068 then it can be used in future constant expressions, so its value
6069 must be available. */
6071 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6072 /* We can't do anything if the decl has dependent type. */;
6074 && init_const_expr_p
6075 && !type_dependent_p
6076 && decl_maybe_constant_var_p (decl)
6077 && !type_dependent_init_p (init)
6078 && !value_dependent_init_p (init))
6080 /* This variable seems to be a non-dependent constant, so process
6081 its initializer. If check_initializer returns non-null the
6082 initialization wasn't constant after all. */
6083 tree init_code = check_initializer (decl, init, flags, &cleanup);
6084 if (init_code == NULL_TREE)
6087 else if (!DECL_PRETTY_FUNCTION_P (decl))
6088 /* Deduce array size even if the initializer is dependent. */
6089 maybe_deduce_size_from_array_init (decl, init);
6092 DECL_INITIAL (decl) = init;
6096 /* Just store non-static data member initializers for later. */
6097 if (init && TREE_CODE (decl) == FIELD_DECL)
6098 DECL_INITIAL (decl) = init;
6100 /* Take care of TYPE_DECLs up front. */
6101 if (TREE_CODE (decl) == TYPE_DECL)
6103 if (type != error_mark_node
6104 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6106 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6107 warning (0, "shadowing previous type declaration of %q#D", decl);
6108 set_identifier_type_value (DECL_NAME (decl), decl);
6111 /* If we have installed this as the canonical typedef for this
6112 type, and that type has not been defined yet, delay emitting
6113 the debug information for it, as we will emit it later. */
6114 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6115 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6116 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6118 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6123 /* A reference will be modified here, as it is initialized. */
6124 if (! DECL_EXTERNAL (decl)
6125 && TREE_READONLY (decl)
6126 && TREE_CODE (type) == REFERENCE_TYPE)
6129 TREE_READONLY (decl) = 0;
6132 if (TREE_CODE (decl) == VAR_DECL)
6134 /* Only variables with trivial initialization and destruction can
6135 have thread-local storage. */
6136 if (DECL_THREAD_LOCAL_P (decl)
6137 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6138 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6139 error ("%qD cannot be thread-local because it has non-trivial "
6140 "type %qT", decl, TREE_TYPE (decl));
6141 /* If this is a local variable that will need a mangled name,
6142 register it now. We must do this before processing the
6143 initializer for the variable, since the initialization might
6144 require a guard variable, and since the mangled name of the
6145 guard variable will depend on the mangled name of this
6147 if (DECL_FUNCTION_SCOPE_P (decl)
6148 && TREE_STATIC (decl)
6149 && !DECL_ARTIFICIAL (decl))
6151 push_local_name (decl);
6152 if (DECL_CONSTRUCTOR_P (current_function_decl)
6153 || DECL_DESTRUCTOR_P (current_function_decl))
6154 /* Normally local_decls is populated during GIMPLE lowering,
6155 but [cd]tors are never actually compiled directly. We need
6156 to put statics on the list so we can deal with the label
6157 address extension. */
6158 add_local_decl (cfun, decl);
6161 /* Convert the initializer to the type of DECL, if we have not
6162 already initialized DECL. */
6163 if (!DECL_INITIALIZED_P (decl)
6164 /* If !DECL_EXTERNAL then DECL is being defined. In the
6165 case of a static data member initialized inside the
6166 class-specifier, there can be an initializer even if DECL
6167 is *not* defined. */
6168 && (!DECL_EXTERNAL (decl) || init))
6170 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6173 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6174 /* Allow libjava/prims.cc define primitive classes. */
6175 if (init != NULL_TREE
6176 || jclass == NULL_TREE
6177 || TREE_CODE (jclass) != TYPE_DECL
6178 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6179 || !same_type_ignoring_top_level_qualifiers_p
6180 (type, TREE_TYPE (TREE_TYPE (jclass))))
6181 error ("Java object %qD not allocated with %<new%>", decl);
6184 init = check_initializer (decl, init, flags, &cleanup);
6185 /* Thread-local storage cannot be dynamically initialized. */
6186 if (DECL_THREAD_LOCAL_P (decl) && init)
6188 error ("%qD is thread-local and so cannot be dynamically "
6189 "initialized", decl);
6193 /* Check that the initializer for a static data member was a
6194 constant. Although we check in the parser that the
6195 initializer is an integral constant expression, we do not
6196 simplify division-by-zero at the point at which it
6197 occurs. Therefore, in:
6199 struct S { static const int i = 7 / 0; };
6201 we issue an error at this point. It would
6202 probably be better to forbid division by zero in
6203 integral constant expressions. */
6204 if (DECL_EXTERNAL (decl) && init)
6206 error ("%qD cannot be initialized by a non-constant expression"
6207 " when being declared", decl);
6208 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6216 The memory occupied by any object of static storage
6217 duration is zero-initialized at program startup before
6218 any other initialization takes place.
6220 We cannot create an appropriate initializer until after
6221 the type of DECL is finalized. If DECL_INITIAL is set,
6222 then the DECL is statically initialized, and any
6223 necessary zero-initialization has already been performed. */
6224 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6225 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6226 /*nelts=*/NULL_TREE,
6227 /*static_storage_p=*/true);
6228 /* Remember that the initialization for this variable has
6230 DECL_INITIALIZED_P (decl) = 1;
6231 /* This declaration is the definition of this variable,
6232 unless we are initializing a static data member within
6233 the class specifier. */
6234 if (!DECL_EXTERNAL (decl))
6235 var_definition_p = true;
6237 /* If the variable has an array type, lay out the type, even if
6238 there is no initializer. It is valid to index through the
6239 array, and we must get TYPE_ALIGN set correctly on the array
6241 else if (TREE_CODE (type) == ARRAY_TYPE)
6244 if (TREE_STATIC (decl)
6245 && !at_function_scope_p ()
6246 && current_function_decl == NULL)
6247 /* So decl is a global variable or a static member of a
6248 non local class. Record the types it uses
6249 so that we can decide later to emit debug info for them. */
6250 record_types_used_by_current_var_decl (decl);
6252 else if (TREE_CODE (decl) == FIELD_DECL
6253 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6254 error ("non-static data member %qD has Java class type", decl);
6256 /* Add this declaration to the statement-tree. This needs to happen
6257 after the call to check_initializer so that the DECL_EXPR for a
6258 reference temp is added before the DECL_EXPR for the reference itself. */
6259 if (DECL_FUNCTION_SCOPE_P (decl))
6260 add_decl_expr (decl);
6262 /* Let the middle end know about variables and functions -- but not
6263 static data members in uninstantiated class templates. */
6264 if (TREE_CODE (decl) == VAR_DECL
6265 || TREE_CODE (decl) == FUNCTION_DECL)
6267 if (TREE_CODE (decl) == VAR_DECL)
6269 layout_var_decl (decl);
6270 maybe_commonize_var (decl);
6273 /* This needs to happen after the linkage is set. */
6274 determine_visibility (decl);
6276 if (var_definition_p && TREE_STATIC (decl))
6278 /* If a TREE_READONLY variable needs initialization
6279 at runtime, it is no longer readonly and we need to
6280 avoid MEM_READONLY_P being set on RTL created for it. */
6283 if (TREE_READONLY (decl))
6284 TREE_READONLY (decl) = 0;
6287 else if (was_readonly)
6288 TREE_READONLY (decl) = 1;
6291 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6293 /* Check for abstractness of the type. Notice that there is no
6294 need to strip array types here since the check for those types
6295 is already done within create_array_type_for_decl. */
6296 if (TREE_CODE (type) == FUNCTION_TYPE
6297 || TREE_CODE (type) == METHOD_TYPE)
6298 abstract_virtuals_error (decl, TREE_TYPE (type));
6300 abstract_virtuals_error (decl, type);
6302 if (TREE_TYPE (decl) == error_mark_node)
6303 /* No initialization required. */
6305 else if (TREE_CODE (decl) == FUNCTION_DECL)
6309 if (init == ridpointers[(int)RID_DEFAULT])
6311 /* An out-of-class default definition is defined at
6312 the point where it is explicitly defaulted. */
6313 if (DECL_DELETED_FN (decl))
6314 maybe_explain_implicit_delete (decl);
6315 else if (DECL_INITIAL (decl) == error_mark_node)
6316 synthesize_method (decl);
6319 error ("function %q#D is initialized like a variable", decl);
6321 /* else no initialization required. */
6323 else if (DECL_EXTERNAL (decl)
6324 && ! (DECL_LANG_SPECIFIC (decl)
6325 && DECL_NOT_REALLY_EXTERN (decl)))
6328 DECL_INITIAL (decl) = init;
6330 /* A variable definition. */
6331 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6332 /* Initialize the local variable. */
6333 initialize_local_var (decl, init);
6335 /* If a variable is defined, and then a subsequent
6336 definition with external linkage is encountered, we will
6337 get here twice for the same variable. We want to avoid
6338 calling expand_static_init more than once. For variables
6339 that are not static data members, we can call
6340 expand_static_init only when we actually process the
6341 initializer. It is not legal to redeclare a static data
6342 member, so this issue does not arise in that case. */
6343 else if (var_definition_p && TREE_STATIC (decl))
6344 expand_static_init (decl, init);
6347 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6348 reference, insert it in the statement-tree now. */
6350 push_cleanup (decl, cleanup, false);
6353 TREE_READONLY (decl) = 1;
6355 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6358 /* Returns a declaration for a VAR_DECL as if:
6360 extern "C" TYPE NAME;
6362 had been seen. Used to create compiler-generated global
6366 declare_global_var (tree name, tree type)
6370 push_to_top_level ();
6371 decl = build_decl (input_location, VAR_DECL, name, type);
6372 TREE_PUBLIC (decl) = 1;
6373 DECL_EXTERNAL (decl) = 1;
6374 DECL_ARTIFICIAL (decl) = 1;
6375 /* If the user has explicitly declared this variable (perhaps
6376 because the code we are compiling is part of a low-level runtime
6377 library), then it is possible that our declaration will be merged
6378 with theirs by pushdecl. */
6379 decl = pushdecl (decl);
6380 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6381 pop_from_top_level ();
6386 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6387 if "__cxa_atexit" is not being used) corresponding to the function
6388 to be called when the program exits. */
6391 get_atexit_fn_ptr_type (void)
6395 if (!atexit_fn_ptr_type_node)
6398 if (flag_use_cxa_atexit
6399 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6400 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6401 arg_type = ptr_type_node;
6403 /* The parameter to "atexit" is "void (*)(void)". */
6404 arg_type = NULL_TREE;
6406 fn_type = build_function_type_list (void_type_node,
6407 arg_type, NULL_TREE);
6408 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6411 return atexit_fn_ptr_type_node;
6414 /* Returns a pointer to the `atexit' function. Note that if
6415 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6416 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6419 get_atexit_node (void)
6425 bool use_aeabi_atexit;
6430 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6432 /* The declaration for `__cxa_atexit' is:
6434 int __cxa_atexit (void (*)(void *), void *, void *)
6436 We build up the argument types and then the function type
6438 tree argtype0, argtype1, argtype2;
6440 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6441 /* First, build the pointer-to-function type for the first
6443 fn_ptr_type = get_atexit_fn_ptr_type ();
6444 /* Then, build the rest of the argument types. */
6445 argtype2 = ptr_type_node;
6446 if (use_aeabi_atexit)
6448 argtype1 = fn_ptr_type;
6449 argtype0 = ptr_type_node;
6453 argtype1 = ptr_type_node;
6454 argtype0 = fn_ptr_type;
6456 /* And the final __cxa_atexit type. */
6457 fn_type = build_function_type_list (integer_type_node,
6458 argtype0, argtype1, argtype2,
6460 fn_ptr_type = build_pointer_type (fn_type);
6461 if (use_aeabi_atexit)
6462 name = "__aeabi_atexit";
6464 name = "__cxa_atexit";
6468 /* The declaration for `atexit' is:
6470 int atexit (void (*)());
6472 We build up the argument types and then the function type
6474 fn_ptr_type = get_atexit_fn_ptr_type ();
6475 /* Build the final atexit type. */
6476 fn_type = build_function_type_list (integer_type_node,
6477 fn_ptr_type, NULL_TREE);
6481 /* Now, build the function declaration. */
6482 push_lang_context (lang_name_c);
6483 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6484 mark_used (atexit_fndecl);
6485 pop_lang_context ();
6486 atexit_node = decay_conversion (atexit_fndecl);
6491 /* Returns the __dso_handle VAR_DECL. */
6494 get_dso_handle_node (void)
6496 if (dso_handle_node)
6497 return dso_handle_node;
6499 /* Declare the variable. */
6500 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6503 #ifdef HAVE_GAS_HIDDEN
6504 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6505 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6508 return dso_handle_node;
6511 /* Begin a new function with internal linkage whose job will be simply
6512 to destroy some particular variable. */
6514 static GTY(()) int start_cleanup_cnt;
6517 start_cleanup_fn (void)
6522 bool use_cxa_atexit = flag_use_cxa_atexit
6523 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6525 push_to_top_level ();
6527 /* No need to mangle this. */
6528 push_lang_context (lang_name_c);
6530 /* Build the name of the function. */
6531 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6532 /* Build the function declaration. */
6533 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6534 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6535 /* It's a function with internal linkage, generated by the
6537 TREE_PUBLIC (fndecl) = 0;
6538 DECL_ARTIFICIAL (fndecl) = 1;
6539 /* Make the function `inline' so that it is only emitted if it is
6540 actually needed. It is unlikely that it will be inlined, since
6541 it is only called via a function pointer, but we avoid unnecessary
6542 emissions this way. */
6543 DECL_DECLARED_INLINE_P (fndecl) = 1;
6544 DECL_INTERFACE_KNOWN (fndecl) = 1;
6545 /* Build the parameter. */
6550 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6551 DECL_CONTEXT (parmdecl) = fndecl;
6552 TREE_USED (parmdecl) = 1;
6553 DECL_READ_P (parmdecl) = 1;
6554 DECL_ARGUMENTS (fndecl) = parmdecl;
6558 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6560 pop_lang_context ();
6562 return current_function_decl;
6565 /* Finish the cleanup function begun by start_cleanup_fn. */
6568 end_cleanup_fn (void)
6570 expand_or_defer_fn (finish_function (0));
6572 pop_from_top_level ();
6575 /* Generate code to handle the destruction of DECL, an object with
6576 static storage duration. */
6579 register_dtor_fn (tree decl)
6586 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6588 type = TREE_TYPE (decl);
6589 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6590 return void_zero_node;
6592 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6593 a class object, we can just pass the destructor to
6594 "__cxa_atexit"; we don't have to build a temporary function to do
6596 use_dtor = (flag_use_cxa_atexit
6597 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6598 && CLASS_TYPE_P (type));
6603 /* Find the destructor. */
6604 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6605 gcc_assert (idx >= 0);
6606 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6607 /* Make sure it is accessible. */
6608 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6612 /* Call build_cleanup before we enter the anonymous function so
6613 that any access checks will be done relative to the current
6614 scope, rather than the scope of the anonymous function. */
6615 build_cleanup (decl);
6617 /* Now start the function. */
6618 cleanup = start_cleanup_fn ();
6620 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6621 to the original function, rather than the anonymous one. That
6622 will make the back end think that nested functions are in use,
6623 which causes confusion. */
6624 push_deferring_access_checks (dk_no_check);
6625 fcall = build_cleanup (decl);
6626 pop_deferring_access_checks ();
6628 /* Create the body of the anonymous function. */
6629 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6630 finish_expr_stmt (fcall);
6631 finish_compound_stmt (compound_stmt);
6635 /* Call atexit with the cleanup function. */
6636 mark_used (cleanup);
6637 cleanup = build_address (cleanup);
6638 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6644 /* We must convert CLEANUP to the type that "__cxa_atexit"
6646 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6647 /* "__cxa_atexit" will pass the address of DECL to the
6648 cleanup function. */
6650 addr = build_address (decl);
6651 /* The declared type of the parameter to "__cxa_atexit" is
6652 "void *". For plain "T*", we could just let the
6653 machinery in cp_build_function_call convert it -- but if the
6654 type is "cv-qualified T *", then we need to convert it
6655 before passing it in, to avoid spurious errors. */
6656 addr = build_nop (ptr_type_node, addr);
6659 /* Since the cleanup functions we build ignore the address
6660 they're given, there's no reason to pass the actual address
6661 in, and, in general, it's cheaper to pass NULL than any
6663 addr = null_pointer_node;
6664 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6665 tf_warning_or_error);
6666 if (targetm.cxx.use_aeabi_atexit ())
6679 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6680 arg0, arg1, arg2, NULL_TREE);
6683 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6684 is its initializer. Generate code to handle the construction
6685 and destruction of DECL. */
6688 expand_static_init (tree decl, tree init)
6690 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6691 gcc_assert (TREE_STATIC (decl));
6693 /* Some variables require no dynamic initialization. */
6695 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6698 if (DECL_FUNCTION_SCOPE_P (decl))
6700 /* Emit code to perform this initialization but once. */
6701 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6702 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6703 tree guard, guard_addr;
6706 /* Emit code to perform this initialization but once. This code
6709 static <type> guard;
6710 if (!guard.first_byte) {
6711 if (__cxa_guard_acquire (&guard)) {
6714 // Do initialization.
6715 flag = true; __cxa_guard_release (&guard);
6716 // Register variable for destruction at end of program.
6718 if (!flag) __cxa_guard_abort (&guard);
6722 Note that the `flag' variable is only set to 1 *after* the
6723 initialization is complete. This ensures that an exception,
6724 thrown during the construction, will cause the variable to
6725 reinitialized when we pass through this code again, as per:
6729 If the initialization exits by throwing an exception, the
6730 initialization is not complete, so it will be tried again
6731 the next time control enters the declaration.
6733 This process should be thread-safe, too; multiple threads
6734 should not be able to initialize the variable more than
6737 /* Create the guard variable. */
6738 guard = get_guard (decl);
6740 /* This optimization isn't safe on targets with relaxed memory
6741 consistency. On such targets we force synchronization in
6742 __cxa_guard_acquire. */
6743 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6745 /* Begin the conditional initialization. */
6746 if_stmt = begin_if_stmt ();
6747 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6748 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6751 if (flag_threadsafe_statics)
6753 tree vfntype = NULL_TREE;
6754 tree acquire_name, release_name, abort_name;
6755 tree acquire_fn, release_fn, abort_fn;
6756 guard_addr = build_address (guard);
6758 acquire_name = get_identifier ("__cxa_guard_acquire");
6759 release_name = get_identifier ("__cxa_guard_release");
6760 abort_name = get_identifier ("__cxa_guard_abort");
6761 acquire_fn = identifier_global_value (acquire_name);
6762 release_fn = identifier_global_value (release_name);
6763 abort_fn = identifier_global_value (abort_name);
6765 acquire_fn = push_library_fn
6766 (acquire_name, build_function_type_list (integer_type_node,
6767 TREE_TYPE (guard_addr),
6770 if (!release_fn || !abort_fn)
6771 vfntype = build_function_type_list (void_type_node,
6772 TREE_TYPE (guard_addr),
6775 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6777 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6779 inner_if_stmt = begin_if_stmt ();
6780 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6783 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6784 begin = get_target_expr (boolean_false_node);
6785 flag = TARGET_EXPR_SLOT (begin);
6787 TARGET_EXPR_CLEANUP (begin)
6788 = build3 (COND_EXPR, void_type_node, flag,
6790 build_call_n (abort_fn, 1, guard_addr));
6791 CLEANUP_EH_ONLY (begin) = 1;
6793 /* Do the initialization itself. */
6794 init = add_stmt_to_compound (begin, init);
6795 init = add_stmt_to_compound
6796 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6797 init = add_stmt_to_compound
6798 (init, build_call_n (release_fn, 1, guard_addr));
6801 init = add_stmt_to_compound (init, set_guard (guard));
6803 /* Use atexit to register a function for destroying this static
6805 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6807 finish_expr_stmt (init);
6809 if (flag_threadsafe_statics)
6811 finish_compound_stmt (inner_then_clause);
6812 finish_then_clause (inner_if_stmt);
6813 finish_if_stmt (inner_if_stmt);
6816 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6818 finish_compound_stmt (then_clause);
6819 finish_then_clause (if_stmt);
6820 finish_if_stmt (if_stmt);
6824 static_aggregates = tree_cons (init, decl, static_aggregates);
6828 /* Make TYPE a complete type based on INITIAL_VALUE.
6829 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6830 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6831 3 if the initializer list is empty (in pedantic mode). */
6834 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6837 tree type, elt_type;
6841 unsigned HOST_WIDE_INT i;
6844 /* An array of character type can be initialized from a
6845 brace-enclosed string constant.
6847 FIXME: this code is duplicated from reshape_init. Probably
6848 we should just call reshape_init here? */
6849 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6850 && TREE_CODE (initial_value) == CONSTRUCTOR
6851 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6853 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6854 tree value = VEC_index (constructor_elt, v, 0)->value;
6856 if (TREE_CODE (value) == STRING_CST
6857 && VEC_length (constructor_elt, v) == 1)
6858 initial_value = value;
6861 /* If any of the elements are parameter packs, we can't actually
6862 complete this type now because the array size is dependent. */
6863 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6865 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6868 if (PACK_EXPANSION_P (value))
6874 failure = complete_array_type (ptype, initial_value, do_default);
6876 /* We can create the array before the element type is complete, which
6877 means that we didn't have these two bits set in the original type
6878 either. In completing the type, we are expected to propagate these
6879 bits. See also complete_type which does the same thing for arrays
6882 if (TYPE_DOMAIN (type))
6884 elt_type = TREE_TYPE (type);
6885 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6886 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6887 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6893 /* As above, but either give an error or reject zero-size arrays, depending
6897 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6898 bool do_default, tsubst_flags_t complain)
6901 bool sfinae = !(complain & tf_error);
6902 /* In SFINAE context we can't be lenient about zero-size arrays. */
6905 failure = cp_complete_array_type (ptype, initial_value, do_default);
6911 /* Not an error. */;
6912 else if (failure == 1)
6913 error ("initializer fails to determine size of %qT", *ptype);
6914 else if (failure == 2)
6917 error ("array size missing in %qT", *ptype);
6919 else if (failure == 3)
6920 error ("zero-size array %qT", *ptype);
6921 *ptype = error_mark_node;
6926 /* Return zero if something is declared to be a member of type
6927 CTYPE when in the context of CUR_TYPE. STRING is the error
6928 message to print in that case. Otherwise, quietly return 1. */
6931 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6933 if (ctype && ctype != cur_type)
6935 if (flags == DTOR_FLAG)
6936 error ("destructor for alien class %qT cannot be a member", ctype);
6938 error ("constructor for alien class %qT cannot be a member", ctype);
6944 /* Subroutine of `grokdeclarator'. */
6946 /* Generate errors possibly applicable for a given set of specifiers.
6947 This is for ARM $7.1.2. */
6950 bad_specifiers (tree object,
6951 enum bad_spec_place type,
6962 error ("%qD declared as a %<virtual%> variable", object);
6964 error ("%qD declared as an %<inline%> variable", object);
6966 error ("%<const%> and %<volatile%> function specifiers on "
6967 "%qD invalid in variable declaration", object);
6971 error ("%qD declared as a %<virtual%> parameter", object);
6973 error ("%qD declared as an %<inline%> parameter", object);
6975 error ("%<const%> and %<volatile%> function specifiers on "
6976 "%qD invalid in parameter declaration", object);
6980 error ("%qD declared as a %<virtual%> type", object);
6982 error ("%qD declared as an %<inline%> type", object);
6984 error ("%<const%> and %<volatile%> function specifiers on "
6985 "%qD invalid in type declaration", object);
6989 error ("%qD declared as a %<virtual%> field", object);
6991 error ("%qD declared as an %<inline%> field", object);
6993 error ("%<const%> and %<volatile%> function specifiers on "
6994 "%qD invalid in field declaration", object);
7000 error ("%q+D declared as a friend", object);
7002 && (TREE_CODE (object) == TYPE_DECL
7003 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7004 && !TYPE_REFFN_P (TREE_TYPE (object))
7005 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7006 error ("%q+D declared with an exception specification", object);
7009 /* DECL is a member function or static data member and is presently
7010 being defined. Check that the definition is taking place in a
7014 check_class_member_definition_namespace (tree decl)
7016 /* These checks only apply to member functions and static data
7018 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7019 || TREE_CODE (decl) == VAR_DECL);
7020 /* We check for problems with specializations in pt.c in
7021 check_specialization_namespace, where we can issue better
7023 if (processing_specialization)
7025 /* There are no restrictions on the placement of
7026 explicit instantiations. */
7027 if (processing_explicit_instantiation)
7031 A member function definition that appears outside of the
7032 class definition shall appear in a namespace scope enclosing
7033 the class definition.
7037 The definition for a static data member shall appear in a
7038 namespace scope enclosing the member's class definition. */
7039 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7040 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7041 decl, DECL_CONTEXT (decl));
7044 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7045 METHOD_TYPE for a non-static member function; QUALS are the
7046 cv-qualifiers that apply to the function. */
7049 build_this_parm (tree type, cp_cv_quals quals)
7054 cp_cv_quals this_quals;
7056 if (CLASS_TYPE_P (type))
7059 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7060 this_type = build_pointer_type (this_type);
7063 this_type = type_of_this_parm (type);
7064 /* The `this' parameter is implicitly `const'; it cannot be
7066 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7067 qual_type = cp_build_qualified_type (this_type, this_quals);
7068 parm = build_artificial_parm (this_identifier, qual_type);
7069 cp_apply_type_quals_to_decl (this_quals, parm);
7073 /* DECL is a static member function. Complain if it was declared
7074 with function-cv-quals. */
7077 check_static_quals (tree decl, cp_cv_quals quals)
7079 if (quals != TYPE_UNQUALIFIED)
7080 error ("static member function %q#D declared with type qualifiers",
7084 /* CTYPE is class type, or null if non-class.
7085 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7087 DECLARATOR is the function's name.
7088 PARMS is a chain of PARM_DECLs for the function.
7089 VIRTUALP is truthvalue of whether the function is virtual or not.
7090 FLAGS are to be passed through to `grokclassfn'.
7091 QUALS are qualifiers indicating whether the function is `const'
7093 RAISES is a list of exceptions that this function can raise.
7094 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7095 not look, and -1 if we should not call `grokclassfn' at all.
7097 SFK is the kind of special function (if any) for the new function.
7099 Returns `NULL_TREE' if something goes wrong, after issuing
7100 applicable error messages. */
7103 grokfndecl (tree ctype,
7107 tree orig_declarator,
7109 enum overload_flags flags,
7116 special_function_kind sfk,
7121 location_t location)
7124 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7128 type = build_exception_variant (type, raises);
7130 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7132 /* If we have an explicit location, use it, otherwise use whatever
7133 build_lang_decl used (probably input_location). */
7134 if (location != UNKNOWN_LOCATION)
7135 DECL_SOURCE_LOCATION (decl) = location;
7137 if (TREE_CODE (type) == METHOD_TYPE)
7140 parm = build_this_parm (type, quals);
7141 DECL_CHAIN (parm) = parms;
7144 DECL_ARGUMENTS (decl) = parms;
7145 for (t = parms; t; t = DECL_CHAIN (t))
7146 DECL_CONTEXT (t) = decl;
7147 /* Propagate volatile out from type to decl. */
7148 if (TYPE_VOLATILE (type))
7149 TREE_THIS_VOLATILE (decl) = 1;
7151 /* Setup decl according to sfk. */
7154 case sfk_constructor:
7155 case sfk_copy_constructor:
7156 case sfk_move_constructor:
7157 DECL_CONSTRUCTOR_P (decl) = 1;
7159 case sfk_destructor:
7160 DECL_DESTRUCTOR_P (decl) = 1;
7166 /* If pointers to member functions use the least significant bit to
7167 indicate whether a function is virtual, ensure a pointer
7168 to this function will have that bit clear. */
7169 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7170 && TREE_CODE (type) == METHOD_TYPE
7171 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7172 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7175 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7179 ("defining explicit specialization %qD in friend declaration",
7183 tree fns = TREE_OPERAND (orig_declarator, 0);
7184 tree args = TREE_OPERAND (orig_declarator, 1);
7186 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7188 /* Something like `template <class T> friend void f<T>()'. */
7189 error ("invalid use of template-id %qD in declaration "
7190 "of primary template",
7196 /* A friend declaration of the form friend void f<>(). Record
7197 the information in the TEMPLATE_ID_EXPR. */
7198 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7200 if (TREE_CODE (fns) == COMPONENT_REF)
7202 /* Due to bison parser ickiness, we will have already looked
7203 up an operator_name or PFUNCNAME within the current class
7204 (see template_id in parse.y). If the current class contains
7205 such a name, we'll get a COMPONENT_REF here. Undo that. */
7207 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7208 == current_class_type);
7209 fns = TREE_OPERAND (fns, 1);
7211 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7212 || TREE_CODE (fns) == OVERLOAD);
7213 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7215 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7216 if (TREE_PURPOSE (t)
7217 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7219 error ("default arguments are not allowed in declaration "
7220 "of friend template specialization %qD",
7227 error ("%<inline%> is not allowed in declaration of friend "
7228 "template specialization %qD",
7235 /* If this decl has namespace scope, set that up. */
7237 set_decl_namespace (decl, in_namespace, friendp);
7239 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7241 /* `main' and builtins have implicit 'C' linkage. */
7242 if ((MAIN_NAME_P (declarator)
7243 || (IDENTIFIER_LENGTH (declarator) > 10
7244 && IDENTIFIER_POINTER (declarator)[0] == '_'
7245 && IDENTIFIER_POINTER (declarator)[1] == '_'
7246 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7247 && current_lang_name == lang_name_cplusplus
7248 && ctype == NULL_TREE
7249 && DECL_FILE_SCOPE_P (decl))
7250 SET_DECL_LANGUAGE (decl, lang_c);
7252 /* Should probably propagate const out from type to decl I bet (mrs). */
7255 DECL_STATIC_FUNCTION_P (decl) = 1;
7256 DECL_CONTEXT (decl) = ctype;
7261 DECL_CONTEXT (decl) = ctype;
7263 check_class_member_definition_namespace (decl);
7266 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7268 if (processing_template_decl)
7269 error ("cannot declare %<::main%> to be a template");
7271 error ("cannot declare %<::main%> to be inline");
7273 error ("cannot declare %<::main%> to be static");
7278 /* Members of anonymous types and local classes have no linkage; make
7279 them internal. If a typedef is made later, this will be changed. */
7280 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7281 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7284 if (publicp && cxx_dialect == cxx98)
7286 /* [basic.link]: A name with no linkage (notably, the name of a class
7287 or enumeration declared in a local scope) shall not be used to
7288 declare an entity with linkage.
7290 DR 757 relaxes this restriction for C++0x. */
7291 t = no_linkage_check (TREE_TYPE (decl),
7292 /*relaxed_p=*/false);
7295 if (TYPE_ANONYMOUS_P (t))
7297 if (DECL_EXTERN_C_P (decl))
7298 /* Allow this; it's pretty common in C. */;
7301 permerror (input_location, "anonymous type with no linkage "
7302 "used to declare function %q#D with linkage",
7304 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7305 permerror (input_location, "%q+#D does not refer to the unqualified "
7306 "type, so it is not used for linkage",
7311 permerror (input_location, "type %qT with no linkage used to "
7312 "declare function %q#D with linkage", t, decl);
7316 TREE_PUBLIC (decl) = publicp;
7319 DECL_INTERFACE_KNOWN (decl) = 1;
7320 DECL_NOT_REALLY_EXTERN (decl) = 1;
7323 /* If the declaration was declared inline, mark it as such. */
7325 DECL_DECLARED_INLINE_P (decl) = 1;
7327 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7329 DECL_EXTERNAL (decl) = 1;
7330 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7333 ? G_("static member function %qD cannot have cv-qualifier")
7334 : G_("non-member function %qD cannot have cv-qualifier"),
7336 quals = TYPE_UNQUALIFIED;
7339 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7340 && !grok_op_properties (decl, /*complain=*/true))
7344 /* Make the init_value nonzero so pushdecl knows this is not
7345 tentative. error_mark_node is replaced later with the BLOCK. */
7346 DECL_INITIAL (decl) = error_mark_node;
7348 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7349 TREE_NOTHROW (decl) = 1;
7351 /* Caller will do the rest of this. */
7355 if (ctype != NULL_TREE)
7356 grokclassfn (ctype, decl, flags);
7358 decl = check_explicit_specialization (orig_declarator, decl,
7361 4 * (friendp != 0));
7362 if (decl == error_mark_node)
7365 if (DECL_STATIC_FUNCTION_P (decl))
7366 check_static_quals (decl, quals);
7370 cplus_decl_attributes (&decl, *attrlist, 0);
7371 *attrlist = NULL_TREE;
7374 /* Check main's type after attributes have been applied. */
7375 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7377 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7380 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7382 error ("%<::main%> must return %<int%>");
7383 newtype = build_function_type (integer_type_node, oldtypeargs);
7384 TREE_TYPE (decl) = newtype;
7387 check_main_parameter_types (decl);
7390 if (ctype != NULL_TREE
7391 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7394 tree old_decl = check_classfn (ctype, decl,
7395 (processing_template_decl
7396 > template_class_depth (ctype))
7397 ? current_template_parms
7400 if (old_decl == error_mark_node)
7408 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7409 /* Because grokfndecl is always supposed to return a
7410 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7411 here. We depend on our callers to figure out that its
7412 really a template that's being returned. */
7413 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7415 if (DECL_STATIC_FUNCTION_P (old_decl)
7416 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7418 /* Remove the `this' parm added by grokclassfn. */
7419 revert_static_member_fn (decl);
7420 check_static_quals (decl, quals);
7422 if (DECL_ARTIFICIAL (old_decl))
7424 error ("definition of implicitly-declared %qD", old_decl);
7427 else if (DECL_DEFAULTED_FN (old_decl))
7429 error ("definition of explicitly-defaulted %q+D", decl);
7430 error ("%q+#D explicitly defaulted here", old_decl);
7434 /* Since we've smashed OLD_DECL to its
7435 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7436 if (TREE_CODE (decl) == TEMPLATE_DECL)
7437 decl = DECL_TEMPLATE_RESULT (decl);
7439 /* Attempt to merge the declarations. This can fail, in
7440 the case of some invalid specialization declarations. */
7441 pushed_scope = push_scope (ctype);
7442 ok = duplicate_decls (decl, old_decl, friendp);
7444 pop_scope (pushed_scope);
7447 error ("no %q#D member function declared in class %qT",
7455 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7458 if (ctype == NULL_TREE || check)
7462 DECL_VIRTUAL_P (decl) = 1;
7467 /* decl is a FUNCTION_DECL.
7468 specifiers are the parsed virt-specifiers.
7470 Set flags to reflect the virt-specifiers.
7475 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7477 if (decl == NULL_TREE)
7479 if (specifiers & VIRT_SPEC_OVERRIDE)
7480 DECL_OVERRIDE_P (decl) = 1;
7481 if (specifiers & VIRT_SPEC_FINAL)
7482 DECL_FINAL_P (decl) = 1;
7486 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7487 the linkage that DECL will receive in the object file. */
7490 set_linkage_for_static_data_member (tree decl)
7492 /* A static data member always has static storage duration and
7493 external linkage. Note that static data members are forbidden in
7494 local classes -- the only situation in which a class has
7495 non-external linkage. */
7496 TREE_PUBLIC (decl) = 1;
7497 TREE_STATIC (decl) = 1;
7498 /* For non-template classes, static data members are always put
7499 out in exactly those files where they are defined, just as
7500 with ordinary namespace-scope variables. */
7501 if (!processing_template_decl)
7502 DECL_INTERFACE_KNOWN (decl) = 1;
7505 /* Create a VAR_DECL named NAME with the indicated TYPE.
7507 If SCOPE is non-NULL, it is the class type or namespace containing
7508 the variable. If SCOPE is NULL, the variable should is created in
7509 the innermost enclosings scope. */
7512 grokvardecl (tree type,
7514 const cp_decl_specifier_seq *declspecs,
7520 tree explicit_scope;
7522 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7524 /* Compute the scope in which to place the variable, but remember
7525 whether or not that scope was explicitly specified by the user. */
7526 explicit_scope = scope;
7529 /* An explicit "extern" specifier indicates a namespace-scope
7531 if (declspecs->storage_class == sc_extern)
7532 scope = current_decl_namespace ();
7533 else if (!at_function_scope_p ())
7534 scope = current_scope ();
7538 && (/* If the variable is a namespace-scope variable declared in a
7539 template, we need DECL_LANG_SPECIFIC. */
7540 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7541 /* Similarly for namespace-scope variables with language linkage
7543 || (TREE_CODE (scope) == NAMESPACE_DECL
7544 && current_lang_name != lang_name_cplusplus)
7545 /* Similarly for static data members. */
7547 decl = build_lang_decl (VAR_DECL, name, type);
7549 decl = build_decl (input_location, VAR_DECL, name, type);
7551 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7552 set_decl_namespace (decl, explicit_scope, 0);
7554 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7556 if (declspecs->storage_class == sc_extern)
7558 DECL_THIS_EXTERN (decl) = 1;
7559 DECL_EXTERNAL (decl) = !initialized;
7562 if (DECL_CLASS_SCOPE_P (decl))
7564 set_linkage_for_static_data_member (decl);
7565 /* This function is only called with out-of-class definitions. */
7566 DECL_EXTERNAL (decl) = 0;
7567 check_class_member_definition_namespace (decl);
7569 /* At top level, either `static' or no s.c. makes a definition
7570 (perhaps tentative), and absence of `static' makes it public. */
7571 else if (toplevel_bindings_p ())
7573 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7574 && (DECL_THIS_EXTERN (decl) || ! constp));
7575 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7577 /* Not at top level, only `static' makes a static definition. */
7580 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7581 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7584 if (declspecs->specs[(int)ds_thread])
7585 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7587 /* If the type of the decl has no linkage, make sure that we'll
7588 notice that in mark_used. */
7589 if (cxx_dialect > cxx98
7590 && decl_linkage (decl) != lk_none
7591 && DECL_LANG_SPECIFIC (decl) == NULL
7592 && !DECL_EXTERN_C_P (decl)
7593 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7594 retrofit_lang_decl (decl);
7596 if (TREE_PUBLIC (decl))
7598 /* [basic.link]: A name with no linkage (notably, the name of a class
7599 or enumeration declared in a local scope) shall not be used to
7600 declare an entity with linkage.
7602 DR 757 relaxes this restriction for C++0x. */
7603 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7604 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7607 if (TYPE_ANONYMOUS_P (t))
7609 if (DECL_EXTERN_C_P (decl))
7610 /* Allow this; it's pretty common in C. */
7614 /* DRs 132, 319 and 389 seem to indicate types with
7615 no linkage can only be used to declare extern "C"
7616 entities. Since it's not always an error in the
7617 ISO C++ 90 Standard, we only issue a warning. */
7618 warning (0, "anonymous type with no linkage used to declare "
7619 "variable %q#D with linkage", decl);
7620 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7621 warning (0, "%q+#D does not refer to the unqualified "
7622 "type, so it is not used for linkage",
7627 warning (0, "type %qT with no linkage used to declare variable "
7628 "%q#D with linkage", t, decl);
7632 DECL_INTERFACE_KNOWN (decl) = 1;
7637 /* Create and return a canonical pointer to member function type, for
7638 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7641 build_ptrmemfunc_type (tree type)
7645 tree unqualified_variant = NULL_TREE;
7647 if (type == error_mark_node)
7650 /* If a canonical type already exists for this type, use it. We use
7651 this method instead of type_hash_canon, because it only does a
7652 simple equality check on the list of field members. */
7654 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7657 /* Make sure that we always have the unqualified pointer-to-member
7659 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7661 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7663 t = make_class_type (RECORD_TYPE);
7664 xref_basetypes (t, NULL_TREE);
7666 /* Let the front end know this is a pointer to member function... */
7667 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7668 /* ... and not really a class type. */
7669 SET_CLASS_TYPE_P (t, 0);
7671 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7674 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7676 DECL_CHAIN (field) = fields;
7679 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7681 /* Zap out the name so that the back end will give us the debugging
7682 information for this anonymous RECORD_TYPE. */
7683 TYPE_NAME (t) = NULL_TREE;
7685 /* If this is not the unqualified form of this pointer-to-member
7686 type, set the TYPE_MAIN_VARIANT for this type to be the
7687 unqualified type. Since they are actually RECORD_TYPEs that are
7688 not variants of each other, we must do this manually.
7689 As we just built a new type there is no need to do yet another copy. */
7690 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7692 int type_quals = cp_type_quals (type);
7693 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7694 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7695 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7696 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7697 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7698 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7699 TREE_TYPE (TYPE_BINFO (t)) = t;
7702 /* Cache this pointer-to-member type so that we can find it again
7704 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7706 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7707 SET_TYPE_STRUCTURAL_EQUALITY (t);
7708 else if (TYPE_CANONICAL (type) != type)
7709 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7714 /* Create and return a pointer to data member type. */
7717 build_ptrmem_type (tree class_type, tree member_type)
7719 if (TREE_CODE (member_type) == METHOD_TYPE)
7721 cp_cv_quals quals = type_memfn_quals (member_type);
7722 member_type = build_memfn_type (member_type, class_type, quals);
7723 return build_ptrmemfunc_type (build_pointer_type (member_type));
7727 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7728 return build_offset_type (class_type, member_type);
7732 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7733 Check to see that the definition is valid. Issue appropriate error
7734 messages. Return 1 if the definition is particularly bad, or 0
7738 check_static_variable_definition (tree decl, tree type)
7740 /* Can't check yet if we don't know the type. */
7741 if (dependent_type_p (type))
7743 /* If DECL is declared constexpr, we'll do the appropriate checks
7744 in check_initializer. */
7745 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7747 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7749 if (literal_type_p (type))
7750 permerror (input_location,
7751 "%<constexpr%> needed for in-class initialization of "
7752 "static data member %q#D of non-integral type", decl);
7754 error ("in-class initialization of static data member %q#D of "
7755 "non-literal type", decl);
7759 /* Motion 10 at San Diego: If a static const integral data member is
7760 initialized with an integral constant expression, the initializer
7761 may appear either in the declaration (within the class), or in
7762 the definition, but not both. If it appears in the class, the
7763 member is a member constant. The file-scope definition is always
7765 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7767 error ("invalid in-class initialization of static data member "
7768 "of non-integral type %qT",
7772 else if (!CP_TYPE_CONST_P (type))
7773 error ("ISO C++ forbids in-class initialization of non-const "
7774 "static member %qD",
7776 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7777 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7778 "%qD of non-integral type %qT", decl, type);
7783 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7784 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7785 expressions out into temporary variables so that walk_tree doesn't
7786 step into them (c++/15764). */
7789 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7791 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7792 tree expr = *expr_p;
7793 if (TREE_CODE (expr) == SAVE_EXPR)
7795 tree op = TREE_OPERAND (expr, 0);
7796 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7797 if (TREE_SIDE_EFFECTS (op))
7798 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7801 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7806 /* Entry point for the above. */
7809 stabilize_vla_size (tree size)
7811 struct pointer_set_t *pset = pointer_set_create ();
7812 /* Break out any function calls into temporary variables. */
7813 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7816 /* Given the SIZE (i.e., number of elements) in an array, compute an
7817 appropriate index type for the array. If non-NULL, NAME is the
7818 name of the thing being declared. */
7821 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7826 tree abi_1_itype = NULL_TREE;
7828 if (error_operand_p (size))
7829 return error_mark_node;
7831 type = TREE_TYPE (size);
7832 /* type_dependent_expression_p? */
7833 if (!dependent_type_p (type))
7835 mark_rvalue_use (size);
7837 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7838 && TREE_SIDE_EFFECTS (size))
7839 /* In C++98, we mark a non-constant array bound with a magic
7840 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7843 size = fold_non_dependent_expr (size);
7845 if (CLASS_TYPE_P (type)
7846 && CLASSTYPE_LITERAL_P (type))
7848 size = build_expr_type_conversion (WANT_INT, size, true);
7851 if (!(complain & tf_error))
7852 return error_mark_node;
7854 error ("size of array %qD has non-integral type %qT",
7857 error ("size of array has non-integral type %qT", type);
7858 size = integer_one_node;
7860 if (size == error_mark_node)
7861 return error_mark_node;
7862 type = TREE_TYPE (size);
7863 /* We didn't support this case in GCC 3.2, so don't bother
7864 trying to model it now in ABI v1. */
7865 abi_1_itype = error_mark_node;
7868 size = maybe_constant_value (size);
7869 if (!TREE_CONSTANT (size))
7873 if (error_operand_p (size))
7874 return error_mark_node;
7876 /* The array bound must be an integer type. */
7877 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7879 if (!(complain & tf_error))
7880 return error_mark_node;
7882 error ("size of array %qD has non-integral type %qT", name, type);
7884 error ("size of array has non-integral type %qT", type);
7885 size = integer_one_node;
7886 type = TREE_TYPE (size);
7890 /* A type is dependent if it is...an array type constructed from any
7891 dependent type or whose size is specified by a constant expression
7892 that is value-dependent. */
7893 /* We can only call value_dependent_expression_p on integral constant
7894 expressions; treat non-constant expressions as dependent, too. */
7895 if (processing_template_decl
7896 && (dependent_type_p (type)
7897 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7899 /* We cannot do any checking for a SIZE that isn't known to be
7900 constant. Just build the index type and mark that it requires
7901 structural equality checks. */
7902 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7903 size, integer_one_node));
7904 TYPE_DEPENDENT_P (itype) = 1;
7905 TYPE_DEPENDENT_P_VALID (itype) = 1;
7906 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7910 if (!abi_version_at_least (2) && processing_template_decl
7911 && abi_1_itype == NULL_TREE)
7912 /* For abi-1, we handled all instances in templates the same way,
7913 even when they were non-dependent. This affects the manglings
7914 produced. So, we do the normal checking for non-dependent
7915 sizes, but at the end we'll return the same type that abi-1
7916 would have, but with TYPE_CANONICAL set to the "right"
7917 value that the current ABI would provide. */
7918 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7919 osize, integer_one_node));
7921 /* Normally, the array-bound will be a constant. */
7922 if (TREE_CODE (size) == INTEGER_CST)
7924 /* Check to see if the array bound overflowed. Make that an
7925 error, no matter how generous we're being. */
7926 constant_expression_error (size);
7928 /* An array must have a positive number of elements. */
7929 if (INT_CST_LT (size, integer_zero_node))
7931 if (!(complain & tf_error))
7932 return error_mark_node;
7934 error ("size of array %qD is negative", name);
7936 error ("size of array is negative");
7937 size = integer_one_node;
7939 /* As an extension we allow zero-sized arrays. */
7940 else if (integer_zerop (size))
7942 if (!(complain & tf_error))
7943 /* We must fail if performing argument deduction (as
7944 indicated by the state of complain), so that
7945 another substitution can be found. */
7946 return error_mark_node;
7947 else if (in_system_header)
7948 /* Allow them in system headers because glibc uses them. */;
7950 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7952 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7955 else if (TREE_CONSTANT (size)
7956 /* We don't allow VLAs at non-function scopes, or during
7957 tentative template substitution. */
7958 || !at_function_scope_p () || !(complain & tf_error))
7960 if (!(complain & tf_error))
7961 return error_mark_node;
7962 /* `(int) &fn' is not a valid array bound. */
7964 error ("size of array %qD is not an integral constant-expression",
7967 error ("size of array is not an integral constant-expression");
7968 size = integer_one_node;
7970 else if (pedantic && warn_vla != 0)
7973 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7975 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7977 else if (warn_vla > 0)
7981 "variable length array %qD is used", name);
7984 "variable length array is used");
7987 if (processing_template_decl && !TREE_CONSTANT (size))
7988 /* A variable sized array. */
7989 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7992 HOST_WIDE_INT saved_processing_template_decl;
7994 /* Compute the index of the largest element in the array. It is
7995 one less than the number of elements in the array. We save
7996 and restore PROCESSING_TEMPLATE_DECL so that computations in
7997 cp_build_binary_op will be appropriately folded. */
7998 saved_processing_template_decl = processing_template_decl;
7999 processing_template_decl = 0;
8000 itype = cp_build_binary_op (input_location,
8002 cp_convert (ssizetype, size),
8003 cp_convert (ssizetype, integer_one_node),
8004 tf_warning_or_error);
8005 itype = fold (itype);
8006 processing_template_decl = saved_processing_template_decl;
8008 if (!TREE_CONSTANT (itype))
8009 /* A variable sized array. */
8010 itype = variable_size (itype);
8011 /* Make sure that there was no overflow when creating to a signed
8012 index type. (For example, on a 32-bit machine, an array with
8013 size 2^32 - 1 is too big.) */
8014 else if (TREE_CODE (itype) == INTEGER_CST
8015 && TREE_OVERFLOW (itype))
8017 if (!(complain & tf_error))
8018 return error_mark_node;
8019 error ("overflow in array dimension");
8020 TREE_OVERFLOW (itype) = 0;
8024 /* Create and return the appropriate index type. */
8025 if (abi_1_itype && abi_1_itype != error_mark_node)
8027 tree t = build_index_type (itype);
8028 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8029 itype = abi_1_itype;
8032 itype = build_index_type (itype);
8034 /* If the index type were dependent, we would have returned early, so
8035 remember that it isn't. */
8036 TYPE_DEPENDENT_P (itype) = 0;
8037 TYPE_DEPENDENT_P_VALID (itype) = 1;
8041 /* Returns the scope (if any) in which the entity declared by
8042 DECLARATOR will be located. If the entity was declared with an
8043 unqualified name, NULL_TREE is returned. */
8046 get_scope_of_declarator (const cp_declarator *declarator)
8048 while (declarator && declarator->kind != cdk_id)
8049 declarator = declarator->declarator;
8051 /* If the declarator-id is a SCOPE_REF, the scope in which the
8052 declaration occurs is the first operand. */
8054 && declarator->u.id.qualifying_scope)
8055 return declarator->u.id.qualifying_scope;
8057 /* Otherwise, the declarator is not a qualified name; the entity will
8058 be declared in the current scope. */
8062 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8063 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8067 create_array_type_for_decl (tree name, tree type, tree size)
8069 tree itype = NULL_TREE;
8071 /* If things have already gone awry, bail now. */
8072 if (type == error_mark_node || size == error_mark_node)
8073 return error_mark_node;
8075 /* 8.3.4/1: If the type of the identifier of D contains the auto
8076 type-specifier, the program is ill-formed. */
8077 if (pedantic && type_uses_auto (type))
8078 pedwarn (input_location, OPT_pedantic,
8079 "declaration of %qD as array of %<auto%>", name);
8081 /* If there are some types which cannot be array elements,
8082 issue an error-message and return. */
8083 switch (TREE_CODE (type))
8087 error ("declaration of %qD as array of void", name);
8089 error ("creating array of void");
8090 return error_mark_node;
8094 error ("declaration of %qD as array of functions", name);
8096 error ("creating array of functions");
8097 return error_mark_node;
8099 case REFERENCE_TYPE:
8101 error ("declaration of %qD as array of references", name);
8103 error ("creating array of references");
8104 return error_mark_node;
8108 error ("declaration of %qD as array of function members", name);
8110 error ("creating array of function members");
8111 return error_mark_node;
8119 The constant expressions that specify the bounds of the arrays
8120 can be omitted only for the first member of the sequence. */
8121 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8124 error ("declaration of %qD as multidimensional array must "
8125 "have bounds for all dimensions except the first",
8128 error ("multidimensional array must have bounds for all "
8129 "dimensions except the first");
8131 return error_mark_node;
8134 /* Figure out the index type for the array. */
8136 itype = compute_array_index_type (name, size, tf_warning_or_error);
8139 T is called the array element type; this type shall not be [...] an
8140 abstract class type. */
8141 abstract_virtuals_error (name, type);
8143 return build_cplus_array_type (type, itype);
8146 /* Check that it's OK to declare a function with the indicated TYPE.
8147 SFK indicates the kind of special function (if any) that this
8148 function is. OPTYPE is the type given in a conversion operator
8149 declaration, or the class type for a constructor/destructor.
8150 Returns the actual return type of the function; that
8151 may be different than TYPE if an error occurs, or for certain
8152 special functions. */
8155 check_special_function_return_type (special_function_kind sfk,
8161 case sfk_constructor:
8163 error ("return type specification for constructor invalid");
8165 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8166 type = build_pointer_type (optype);
8168 type = void_type_node;
8171 case sfk_destructor:
8173 error ("return type specification for destructor invalid");
8174 /* We can't use the proper return type here because we run into
8175 problems with ambiguous bases and covariant returns.
8176 Java classes are left unchanged because (void *) isn't a valid
8177 Java type, and we don't want to change the Java ABI. */
8178 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8179 type = build_pointer_type (void_type_node);
8181 type = void_type_node;
8184 case sfk_conversion:
8186 error ("return type specified for %<operator %T%>", optype);
8197 /* A variable or data member (whose unqualified name is IDENTIFIER)
8198 has been declared with the indicated TYPE. If the TYPE is not
8199 acceptable, issue an error message and return a type to use for
8200 error-recovery purposes. */
8203 check_var_type (tree identifier, tree type)
8205 if (VOID_TYPE_P (type))
8208 error ("unnamed variable or field declared void");
8209 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8211 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8212 error ("variable or field %qE declared void", identifier);
8215 error ("variable or field declared void");
8216 type = error_mark_node;
8222 /* Given declspecs and a declarator (abstract or otherwise), determine
8223 the name and type of the object declared and construct a DECL node
8226 DECLSPECS points to the representation of declaration-specifier
8227 sequence that precedes declarator.
8229 DECL_CONTEXT says which syntactic context this declaration is in:
8230 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8231 FUNCDEF for a function definition. Like NORMAL but a few different
8232 error messages in each case. Return value may be zero meaning
8233 this definition is too screwy to try to parse.
8234 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8235 handle member functions (which have FIELD context).
8236 Return value may be zero meaning this definition is too screwy to
8238 PARM for a parameter declaration (either within a function prototype
8239 or before a function body). Make a PARM_DECL, or return void_type_node.
8240 TPARM for a template parameter declaration.
8241 CATCHPARM for a parameter declaration before a catch clause.
8242 TYPENAME if for a typename (in a cast or sizeof).
8243 Don't make a DECL node; just return the ..._TYPE node.
8244 FIELD for a struct or union field; make a FIELD_DECL.
8245 BITFIELD for a field with specified width.
8247 INITIALIZED is as for start_decl.
8249 ATTRLIST is a pointer to the list of attributes, which may be NULL
8250 if there are none; *ATTRLIST may be modified if attributes from inside
8251 the declarator should be applied to the declaration.
8253 When this function is called, scoping variables (such as
8254 CURRENT_CLASS_TYPE) should reflect the scope in which the
8255 declaration occurs, not the scope in which the new declaration will
8256 be placed. For example, on:
8260 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8263 Returns a DECL (if a declarator is present), a TYPE (if there is no
8264 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8268 grokdeclarator (const cp_declarator *declarator,
8269 const cp_decl_specifier_seq *declspecs,
8270 enum decl_context decl_context,
8274 tree type = NULL_TREE;
8276 int explicit_int128 = 0;
8277 int virtualp, explicitp, friendp, inlinep, staticp;
8278 int explicit_int = 0;
8279 int explicit_char = 0;
8280 int defaulted_int = 0;
8281 tree dependent_name = NULL_TREE;
8283 tree typedef_decl = NULL_TREE;
8284 const char *name = NULL;
8285 tree typedef_type = NULL_TREE;
8286 /* True if this declarator is a function definition. */
8287 bool funcdef_flag = false;
8288 cp_declarator_kind innermost_code = cdk_error;
8291 /* See the code below that used this. */
8292 tree decl_attr = NULL_TREE;
8295 /* Keep track of what sort of function is being processed
8296 so that we can warn about default return values, or explicit
8297 return values which do not match prescribed defaults. */
8298 special_function_kind sfk = sfk_none;
8300 tree dname = NULL_TREE;
8301 tree ctor_return_type = NULL_TREE;
8302 enum overload_flags flags = NO_SPECIAL;
8303 /* cv-qualifiers that apply to the declarator, for a declaration of
8304 a member function. */
8305 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8306 /* virt-specifiers that apply to the declarator, for a declaration of
8307 a member function. */
8308 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8309 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8311 tree raises = NULL_TREE;
8312 int template_count = 0;
8313 tree returned_attrs = NULL_TREE;
8314 tree parms = NULL_TREE;
8315 const cp_declarator *id_declarator;
8316 /* The unqualified name of the declarator; either an
8317 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8318 tree unqualified_id;
8319 /* The class type, if any, in which this entity is located,
8320 or NULL_TREE if none. Note that this value may be different from
8321 the current class type; for example if an attempt is made to declare
8322 "A::f" inside "B", this value will be "A". */
8323 tree ctype = current_class_type;
8324 /* The NAMESPACE_DECL for the namespace in which this entity is
8325 located. If an unqualified name is used to declare the entity,
8326 this value will be NULL_TREE, even if the entity is located at
8328 tree in_namespace = NULL_TREE;
8329 cp_storage_class storage_class;
8330 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8331 bool type_was_error_mark_node = false;
8332 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8333 bool template_type_arg = false;
8334 bool template_parm_flag = false;
8335 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8338 signed_p = declspecs->specs[(int)ds_signed];
8339 unsigned_p = declspecs->specs[(int)ds_unsigned];
8340 short_p = declspecs->specs[(int)ds_short];
8341 long_p = declspecs->specs[(int)ds_long];
8342 longlong = declspecs->specs[(int)ds_long] >= 2;
8343 explicit_int128 = declspecs->explicit_int128_p;
8344 thread_p = declspecs->specs[(int)ds_thread];
8346 if (decl_context == FUNCDEF)
8347 funcdef_flag = true, decl_context = NORMAL;
8348 else if (decl_context == MEMFUNCDEF)
8349 funcdef_flag = true, decl_context = FIELD;
8350 else if (decl_context == BITFIELD)
8351 bitfield = 1, decl_context = FIELD;
8352 else if (decl_context == TEMPLATE_TYPE_ARG)
8353 template_type_arg = true, decl_context = TYPENAME;
8354 else if (decl_context == TPARM)
8355 template_parm_flag = true, decl_context = PARM;
8357 if (initialized > 1)
8358 funcdef_flag = true;
8360 /* Look inside a declarator for the name being declared
8361 and get it as a string, for an error message. */
8362 for (id_declarator = declarator;
8364 id_declarator = id_declarator->declarator)
8366 if (id_declarator->kind != cdk_id)
8367 innermost_code = id_declarator->kind;
8369 switch (id_declarator->kind)
8372 if (id_declarator->declarator
8373 && id_declarator->declarator->kind == cdk_id)
8375 sfk = id_declarator->declarator->u.id.sfk;
8376 if (sfk == sfk_destructor)
8383 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8384 tree decl = id_declarator->u.id.unqualified_name;
8387 if (qualifying_scope)
8389 if (at_function_scope_p ())
8393 A declarator-id shall not be qualified except
8396 None of the cases are permitted in block
8398 if (qualifying_scope == global_namespace)
8399 error ("invalid use of qualified-name %<::%D%>",
8401 else if (TYPE_P (qualifying_scope))
8402 error ("invalid use of qualified-name %<%T::%D%>",
8403 qualifying_scope, decl);
8405 error ("invalid use of qualified-name %<%D::%D%>",
8406 qualifying_scope, decl);
8407 return error_mark_node;
8409 else if (TYPE_P (qualifying_scope))
8411 ctype = qualifying_scope;
8412 if (!MAYBE_CLASS_TYPE_P (ctype))
8414 error ("%q#T is not a class or a namespace", ctype);
8417 else if (innermost_code != cdk_function
8418 && current_class_type
8419 && !UNIQUELY_DERIVED_FROM_P (ctype,
8420 current_class_type))
8422 error ("type %qT is not derived from type %qT",
8423 ctype, current_class_type);
8424 return error_mark_node;
8427 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8428 in_namespace = qualifying_scope;
8430 switch (TREE_CODE (decl))
8436 if (innermost_code != cdk_function)
8438 error ("declaration of %qD as non-function", decl);
8439 return error_mark_node;
8441 else if (!qualifying_scope
8442 && !(current_class_type && at_class_scope_p ()))
8444 error ("declaration of %qD as non-member", decl);
8445 return error_mark_node;
8448 type = TREE_OPERAND (decl, 0);
8450 type = constructor_name (type);
8451 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8456 case TEMPLATE_ID_EXPR:
8458 tree fns = TREE_OPERAND (decl, 0);
8461 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8463 gcc_assert (is_overloaded_fn (dname));
8464 dname = DECL_NAME (get_first_fn (dname));
8469 case IDENTIFIER_NODE:
8470 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8473 if (C_IS_RESERVED_WORD (dname))
8475 error ("declarator-id missing; using reserved word %qD",
8477 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8479 else if (!IDENTIFIER_TYPENAME_P (dname))
8480 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8483 gcc_assert (flags == NO_SPECIAL);
8484 flags = TYPENAME_FLAG;
8485 ctor_return_type = TREE_TYPE (dname);
8486 sfk = sfk_conversion;
8487 if (is_typename_at_global_scope (dname))
8488 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8490 name = "<invalid operator>";
8507 return error_mark_node;
8512 if (id_declarator->kind == cdk_id)
8518 The declarator in a function-definition shall have the form
8519 D1 ( parameter-declaration-clause) ... */
8520 if (funcdef_flag && innermost_code != cdk_function)
8522 error ("function definition does not declare parameters");
8523 return error_mark_node;
8526 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8527 && innermost_code != cdk_function
8528 && ! (ctype && !declspecs->any_specifiers_p))
8530 error ("declaration of %qD as non-function", dname);
8531 return error_mark_node;
8534 if (dname && IDENTIFIER_OPNAME_P (dname))
8536 if (declspecs->specs[(int)ds_typedef])
8538 error ("declaration of %qD as %<typedef%>", dname);
8539 return error_mark_node;
8541 else if (decl_context == PARM || decl_context == CATCHPARM)
8543 error ("declaration of %qD as parameter", dname);
8544 return error_mark_node;
8548 /* Anything declared one level down from the top level
8549 must be one of the parameters of a function
8550 (because the body is at least two levels down). */
8552 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8553 by not allowing C++ class definitions to specify their parameters
8554 with xdecls (must be spec.d in the parmlist).
8556 Since we now wait to push a class scope until we are sure that
8557 we are in a legitimate method context, we must set oldcname
8558 explicitly (since current_class_name is not yet alive).
8560 We also want to avoid calling this a PARM if it is in a namespace. */
8562 if (decl_context == NORMAL && !toplevel_bindings_p ())
8564 cp_binding_level *b = current_binding_level;
8565 current_binding_level = b->level_chain;
8566 if (current_binding_level != 0 && toplevel_bindings_p ())
8567 decl_context = PARM;
8568 current_binding_level = b;
8572 name = decl_context == PARM ? "parameter" : "type name";
8574 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8576 error ("%<constexpr%> cannot appear in a typedef declaration");
8577 return error_mark_node;
8580 /* If there were multiple types specified in the decl-specifier-seq,
8581 issue an error message. */
8582 if (declspecs->multiple_types_p)
8584 error ("two or more data types in declaration of %qs", name);
8585 return error_mark_node;
8588 if (declspecs->conflicting_specifiers_p)
8590 error ("conflicting specifiers in declaration of %qs", name);
8591 return error_mark_node;
8594 /* Extract the basic type from the decl-specifier-seq. */
8595 type = declspecs->type;
8596 if (type == error_mark_node)
8599 type_was_error_mark_node = true;
8601 /* If the entire declaration is itself tagged as deprecated then
8602 suppress reports of deprecated items. */
8603 if (type && TREE_DEPRECATED (type)
8604 && deprecated_state != DEPRECATED_SUPPRESS)
8605 warn_deprecated_use (type, NULL_TREE);
8606 if (type && TREE_CODE (type) == TYPE_DECL)
8608 typedef_decl = type;
8609 type = TREE_TYPE (typedef_decl);
8610 if (TREE_DEPRECATED (type)
8611 && DECL_ARTIFICIAL (typedef_decl)
8612 && deprecated_state != DEPRECATED_SUPPRESS)
8613 warn_deprecated_use (type, NULL_TREE);
8615 /* No type at all: default to `int', and set DEFAULTED_INT
8616 because it was not a user-defined typedef. */
8617 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8619 /* These imply 'int'. */
8620 type = integer_type_node;
8624 explicit_int = declspecs->explicit_int_p;
8625 explicit_char = declspecs->explicit_char_p;
8628 /* See the code below that used this. */
8630 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8632 typedef_type = type;
8635 if (sfk != sfk_conversion)
8636 ctor_return_type = ctype;
8638 if (sfk != sfk_none)
8639 type = check_special_function_return_type (sfk, type,
8641 else if (type == NULL_TREE)
8647 /* We handle `main' specially here, because 'main () { }' is so
8648 common. With no options, it is allowed. With -Wreturn-type,
8649 it is a warning. It is only an error with -pedantic-errors. */
8650 is_main = (funcdef_flag
8651 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8652 && MAIN_NAME_P (dname)
8653 && ctype == NULL_TREE
8654 && in_namespace == NULL_TREE
8655 && current_namespace == global_namespace);
8657 if (type_was_error_mark_node)
8658 /* We've already issued an error, don't complain more. */;
8659 else if (in_system_header || flag_ms_extensions)
8660 /* Allow it, sigh. */;
8662 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8664 pedwarn (input_location, OPT_pedantic,
8665 "ISO C++ forbids declaration of %qs with no type", name);
8667 warning (OPT_Wreturn_type,
8668 "ISO C++ forbids declaration of %qs with no type", name);
8670 type = integer_type_node;
8675 if (explicit_int128)
8677 if (int128_integer_type_node == NULL_TREE)
8679 error ("%<__int128%> is not supported by this target");
8680 explicit_int128 = false;
8682 else if (pedantic && ! in_system_header)
8683 pedwarn (input_location, OPT_pedantic,
8684 "ISO C++ does not support %<__int128%> for %qs", name);
8687 /* Now process the modifiers that were specified
8688 and check for invalid combinations. */
8690 /* Long double is a special combination. */
8691 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8694 type = cp_build_qualified_type (long_double_type_node,
8695 cp_type_quals (type));
8698 /* Check all other uses of type modifiers. */
8700 if (unsigned_p || signed_p || long_p || short_p)
8704 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8705 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8706 else if (signed_p && unsigned_p)
8707 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8708 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8709 error ("%<long long%> invalid for %qs", name);
8710 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8711 error ("%<long%> invalid for %qs", name);
8712 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8713 error ("%<short%> invalid for %qs", name);
8714 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8715 error ("%<long%> or %<short%> invalid for %qs", name);
8716 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8717 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8718 else if ((long_p || short_p) && explicit_char)
8719 error ("%<long%> or %<short%> specified with char for %qs", name);
8720 else if (long_p && short_p)
8721 error ("%<long%> and %<short%> specified together for %qs", name);
8722 else if (type == char16_type_node || type == char32_type_node)
8724 if (signed_p || unsigned_p)
8725 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8726 else if (short_p || long_p)
8727 error ("%<short%> or %<long%> invalid for %qs", name);
8732 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8734 pedwarn (input_location, OPT_pedantic,
8735 "long, short, signed or unsigned used invalidly for %qs",
8737 if (flag_pedantic_errors)
8742 /* Discard the type modifiers if they are invalid. */
8753 /* Decide whether an integer type is signed or not.
8754 Optionally treat bitfields as signed by default. */
8758 It is implementation-defined whether a plain (neither
8759 explicitly signed or unsigned) char, short, int, or long
8760 bit-field is signed or unsigned.
8762 Naturally, we extend this to long long as well. Note that
8763 this does not include wchar_t. */
8764 || (bitfield && !flag_signed_bitfields
8766 /* A typedef for plain `int' without `signed' can be
8767 controlled just like plain `int', but a typedef for
8768 `signed int' cannot be so controlled. */
8770 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8771 && TREE_CODE (type) == INTEGER_TYPE
8772 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8774 if (explicit_int128)
8775 type = int128_unsigned_type_node;
8777 type = long_long_unsigned_type_node;
8779 type = long_unsigned_type_node;
8781 type = short_unsigned_type_node;
8782 else if (type == char_type_node)
8783 type = unsigned_char_type_node;
8784 else if (typedef_decl)
8785 type = unsigned_type_for (type);
8787 type = unsigned_type_node;
8789 else if (signed_p && type == char_type_node)
8790 type = signed_char_type_node;
8791 else if (explicit_int128)
8792 type = int128_integer_type_node;
8794 type = long_long_integer_type_node;
8796 type = long_integer_type_node;
8798 type = short_integer_type_node;
8800 if (declspecs->specs[(int)ds_complex])
8802 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8803 error ("complex invalid for %qs", name);
8804 /* If we just have "complex", it is equivalent to
8805 "complex double", but if any modifiers at all are specified it is
8806 the complex form of TYPE. E.g, "complex short" is
8807 "complex short int". */
8808 else if (defaulted_int && ! longlong && ! explicit_int128
8809 && ! (long_p || short_p || signed_p || unsigned_p))
8810 type = complex_double_type_node;
8811 else if (type == integer_type_node)
8812 type = complex_integer_type_node;
8813 else if (type == float_type_node)
8814 type = complex_float_type_node;
8815 else if (type == double_type_node)
8816 type = complex_double_type_node;
8817 else if (type == long_double_type_node)
8818 type = complex_long_double_type_node;
8820 type = build_complex_type (type);
8823 type_quals = TYPE_UNQUALIFIED;
8824 if (declspecs->specs[(int)ds_const])
8825 type_quals |= TYPE_QUAL_CONST;
8826 if (declspecs->specs[(int)ds_volatile])
8827 type_quals |= TYPE_QUAL_VOLATILE;
8828 if (declspecs->specs[(int)ds_restrict])
8829 type_quals |= TYPE_QUAL_RESTRICT;
8830 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8831 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8834 type_quals |= cp_type_quals (type);
8835 type = cp_build_qualified_type_real
8836 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8837 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8838 /* We might have ignored or rejected some of the qualifiers. */
8839 type_quals = cp_type_quals (type);
8842 inlinep = !! declspecs->specs[(int)ds_inline];
8843 virtualp = !! declspecs->specs[(int)ds_virtual];
8844 explicitp = !! declspecs->specs[(int)ds_explicit];
8846 storage_class = declspecs->storage_class;
8847 if (storage_class == sc_static)
8848 staticp = 1 + (decl_context == FIELD);
8850 if (virtualp && staticp == 2)
8852 error ("member %qD cannot be declared both virtual and static", dname);
8853 storage_class = sc_none;
8856 friendp = !! declspecs->specs[(int)ds_friend];
8858 if (dependent_name && !friendp)
8860 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8861 return error_mark_node;
8864 /* Issue errors about use of storage classes for parameters. */
8865 if (decl_context == PARM)
8867 if (declspecs->specs[(int)ds_typedef])
8869 error ("typedef declaration invalid in parameter declaration");
8870 return error_mark_node;
8872 else if (template_parm_flag && storage_class != sc_none)
8874 error ("storage class specified for template parameter %qs", name);
8875 return error_mark_node;
8877 else if (storage_class == sc_static
8878 || storage_class == sc_extern
8880 error ("storage class specifiers invalid in parameter declarations");
8882 /* Function parameters cannot be constexpr. If we saw one, moan
8883 and pretend it wasn't there. */
8886 error ("a parameter cannot be declared %<constexpr%>");
8891 /* Give error if `virtual' is used outside of class declaration. */
8893 && (current_class_name == NULL_TREE || decl_context != FIELD))
8895 error ("%<virtual%> outside class declaration");
8899 /* Static anonymous unions are dealt with here. */
8900 if (staticp && decl_context == TYPENAME
8902 && ANON_AGGR_TYPE_P (declspecs->type))
8903 decl_context = FIELD;
8905 /* Warn about storage classes that are invalid for certain
8906 kinds of declarations (parameters, typenames, etc.). */
8909 && storage_class != sc_extern
8910 && storage_class != sc_static)
8911 || declspecs->specs[(int)ds_typedef]))
8913 error ("multiple storage classes in declaration of %qs", name);
8916 if (decl_context != NORMAL
8917 && ((storage_class != sc_none
8918 && storage_class != sc_mutable)
8921 if ((decl_context == PARM || decl_context == CATCHPARM)
8922 && (storage_class == sc_register
8923 || storage_class == sc_auto))
8925 else if (declspecs->specs[(int)ds_typedef])
8927 else if (decl_context == FIELD
8928 /* C++ allows static class elements. */
8929 && storage_class == sc_static)
8930 /* C++ also allows inlines and signed and unsigned elements,
8931 but in those cases we don't come in here. */
8935 if (decl_context == FIELD)
8936 error ("storage class specified for %qs", name);
8939 if (decl_context == PARM || decl_context == CATCHPARM)
8940 error ("storage class specified for parameter %qs", name);
8942 error ("storage class specified for typename");
8944 if (storage_class == sc_register
8945 || storage_class == sc_auto
8946 || storage_class == sc_extern
8948 storage_class = sc_none;
8951 else if (storage_class == sc_extern && funcdef_flag
8952 && ! toplevel_bindings_p ())
8953 error ("nested function %qs declared %<extern%>", name);
8954 else if (toplevel_bindings_p ())
8956 if (storage_class == sc_auto)
8957 error ("top-level declaration of %qs specifies %<auto%>", name);
8960 && storage_class != sc_extern
8961 && storage_class != sc_static)
8963 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8968 if (storage_class && friendp)
8970 error ("storage class specifiers invalid in friend function declarations");
8971 storage_class = sc_none;
8976 unqualified_id = NULL_TREE;
8979 unqualified_id = id_declarator->u.id.unqualified_name;
8980 switch (TREE_CODE (unqualified_id))
8983 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8984 if (TYPE_P (unqualified_id))
8985 unqualified_id = constructor_name (unqualified_id);
8988 case IDENTIFIER_NODE:
8989 case TEMPLATE_ID_EXPR:
8997 /* Determine the type of the entity declared by recurring on the
8999 for (; declarator; declarator = declarator->declarator)
9001 const cp_declarator *inner_declarator;
9004 if (type == error_mark_node)
9005 return error_mark_node;
9007 attrs = declarator->attributes;
9013 if (declarator == NULL || declarator->kind == cdk_id)
9014 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9015 if (declarator->kind == cdk_function)
9016 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9017 if (declarator->kind == cdk_array)
9018 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9019 returned_attrs = decl_attributes (&type,
9020 chainon (returned_attrs, attrs),
9024 if (declarator->kind == cdk_id)
9027 inner_declarator = declarator->declarator;
9029 switch (declarator->kind)
9032 type = create_array_type_for_decl (dname, type,
9033 declarator->u.array.bounds);
9041 /* Declaring a function type.
9042 Make sure we have a valid type for the function to return. */
9044 if (type_quals != TYPE_UNQUALIFIED)
9046 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9047 warning (OPT_Wignored_qualifiers,
9048 "type qualifiers ignored on function return type");
9049 /* We now know that the TYPE_QUALS don't apply to the
9050 decl, but to its return type. */
9051 type_quals = TYPE_UNQUALIFIED;
9053 errmsg = targetm.invalid_return_type (type);
9057 type = integer_type_node;
9060 /* Error about some types functions can't return. */
9062 if (TREE_CODE (type) == FUNCTION_TYPE)
9064 error ("%qs declared as function returning a function", name);
9065 return error_mark_node;
9067 if (TREE_CODE (type) == ARRAY_TYPE)
9069 error ("%qs declared as function returning an array", name);
9070 return error_mark_node;
9073 /* Pick up type qualifiers which should be applied to `this'. */
9074 memfn_quals = declarator->u.function.qualifiers;
9075 /* Pick up virt-specifiers. */
9076 virt_specifiers = declarator->u.function.virt_specifiers;
9077 /* Pick up the exception specifications. */
9078 raises = declarator->u.function.exception_specification;
9079 /* If the exception-specification is ill-formed, let's pretend
9080 there wasn't one. */
9081 if (raises == error_mark_node)
9084 /* Say it's a definition only for the CALL_EXPR
9085 closest to the identifier. */
9086 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9088 /* Handle a late-specified return type. */
9091 if (type_uses_auto (type))
9093 if (!declarator->u.function.late_return_type)
9095 error ("%qs function uses %<auto%> type specifier without"
9096 " late return type", name);
9097 return error_mark_node;
9099 else if (!is_auto (type))
9101 error ("%qs function with late return type has"
9102 " %qT as its type rather than plain %<auto%>",
9104 return error_mark_node;
9107 else if (declarator->u.function.late_return_type)
9109 error ("%qs function with late return type not declared"
9110 " with %<auto%> type specifier", name);
9111 return error_mark_node;
9114 type = splice_late_return_type
9115 (type, declarator->u.function.late_return_type);
9116 if (type == error_mark_node)
9117 return error_mark_node;
9119 if (ctype == NULL_TREE
9120 && decl_context == FIELD
9122 && (friendp == 0 || dname == current_class_name))
9123 ctype = current_class_type;
9125 if (ctype && (sfk == sfk_constructor
9126 || sfk == sfk_destructor))
9128 /* We are within a class's scope. If our declarator name
9129 is the same as the class name, and we are defining
9130 a function, then it is a constructor/destructor, and
9131 therefore returns a void type. */
9133 /* ISO C++ 12.4/2. A destructor may not be declared
9134 const or volatile. A destructor may not be
9137 ISO C++ 12.1. A constructor may not be declared
9138 const or volatile. A constructor may not be
9139 virtual. A constructor may not be static. */
9141 error ((flags == DTOR_FLAG)
9142 ? "destructor cannot be static member function"
9143 : "constructor cannot be static member function");
9146 error ((flags == DTOR_FLAG)
9147 ? "destructors may not be cv-qualified"
9148 : "constructors may not be cv-qualified");
9149 memfn_quals = TYPE_UNQUALIFIED;
9152 if (decl_context == FIELD
9153 && !member_function_or_else (ctype,
9156 return error_mark_node;
9158 if (flags != DTOR_FLAG)
9160 /* It's a constructor. */
9165 permerror (input_location, "constructors cannot be declared virtual");
9168 if (decl_context == FIELD
9169 && sfk != sfk_constructor)
9170 return error_mark_node;
9172 if (decl_context == FIELD)
9178 error ("can%'t initialize friend function %qs", name);
9181 /* Cannot be both friend and virtual. */
9182 error ("virtual functions cannot be friends");
9185 if (decl_context == NORMAL)
9186 error ("friend declaration not in class definition");
9187 if (current_function_decl && funcdef_flag)
9188 error ("can%'t define friend function %qs in a local "
9192 else if (ctype && sfk == sfk_conversion)
9196 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9201 arg_types = grokparms (declarator->u.function.parameters,
9204 if (inner_declarator
9205 && inner_declarator->kind == cdk_id
9206 && inner_declarator->u.id.sfk == sfk_destructor
9207 && arg_types != void_list_node)
9209 error ("destructors may not have parameters");
9210 arg_types = void_list_node;
9214 type = build_function_type (type, arg_types);
9221 /* Filter out pointers-to-references and references-to-references.
9222 We can get these if a TYPE_DECL is used. */
9224 if (TREE_CODE (type) == REFERENCE_TYPE)
9226 if (declarator->kind != cdk_reference)
9228 error ("cannot declare pointer to %q#T", type);
9229 type = TREE_TYPE (type);
9232 /* In C++0x, we allow reference to reference declarations
9233 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9234 and template type arguments [14.3.1/4 temp.arg.type]. The
9235 check for direct reference to reference declarations, which
9236 are still forbidden, occurs below. Reasoning behind the change
9237 can be found in DR106, DR540, and the rvalue reference
9239 else if (cxx_dialect == cxx98)
9241 error ("cannot declare reference to %q#T", type);
9242 type = TREE_TYPE (type);
9245 else if (VOID_TYPE_P (type))
9247 if (declarator->kind == cdk_reference)
9248 error ("cannot declare reference to %q#T", type);
9249 else if (declarator->kind == cdk_ptrmem)
9250 error ("cannot declare pointer to %q#T member", type);
9253 /* We now know that the TYPE_QUALS don't apply to the decl,
9254 but to the target of the pointer. */
9255 type_quals = TYPE_UNQUALIFIED;
9257 if (declarator->kind == cdk_ptrmem
9258 && (TREE_CODE (type) == FUNCTION_TYPE
9259 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9261 memfn_quals |= type_memfn_quals (type);
9262 type = build_memfn_type (type,
9263 declarator->u.pointer.class_type,
9265 if (type == error_mark_node)
9266 return error_mark_node;
9267 memfn_quals = TYPE_UNQUALIFIED;
9270 if (TREE_CODE (type) == FUNCTION_TYPE
9271 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9272 error (declarator->kind == cdk_reference
9273 ? G_("cannot declare reference to qualified function type %qT")
9274 : G_("cannot declare pointer to qualified function type %qT"),
9277 /* When the pointed-to type involves components of variable size,
9278 care must be taken to ensure that the size evaluation code is
9279 emitted early enough to dominate all the possible later uses
9280 and late enough for the variables on which it depends to have
9283 This is expected to happen automatically when the pointed-to
9284 type has a name/declaration of it's own, but special attention
9285 is required if the type is anonymous.
9287 We handle the NORMAL and FIELD contexts here by inserting a
9288 dummy statement that just evaluates the size at a safe point
9289 and ensures it is not deferred until e.g. within a deeper
9290 conditional context (c++/43555).
9292 We expect nothing to be needed here for PARM or TYPENAME.
9293 Evaluating the size at this point for TYPENAME would
9294 actually be incorrect, as we might be in the middle of an
9295 expression with side effects on the pointed-to type size
9296 "arguments" prior to the pointer declaration point and the
9297 size evaluation could end up prior to the side effects. */
9299 if (!TYPE_NAME (type)
9300 && (decl_context == NORMAL || decl_context == FIELD)
9301 && at_function_scope_p ()
9302 && variably_modified_type_p (type, NULL_TREE))
9304 /* First break out any side-effects. */
9305 stabilize_vla_size (TYPE_SIZE (type));
9306 /* And then force evaluation of the SAVE_EXPR. */
9307 finish_expr_stmt (TYPE_SIZE (type));
9310 if (declarator->kind == cdk_reference)
9312 /* In C++0x, the type we are creating a reference to might be
9313 a typedef which is itself a reference type. In that case,
9314 we follow the reference collapsing rules in
9315 [7.1.3/8 dcl.typedef] to create the final reference type:
9317 "If a typedef TD names a type that is a reference to a type
9318 T, an attempt to create the type 'lvalue reference to cv TD'
9319 creates the type 'lvalue reference to T,' while an attempt
9320 to create the type "rvalue reference to cv TD' creates the
9323 if (VOID_TYPE_P (type))
9324 /* We already gave an error. */;
9325 else if (TREE_CODE (type) == REFERENCE_TYPE)
9327 if (declarator->u.reference.rvalue_ref)
9328 /* Leave type alone. */;
9330 type = cp_build_reference_type (TREE_TYPE (type), false);
9333 type = cp_build_reference_type
9334 (type, declarator->u.reference.rvalue_ref);
9336 /* In C++0x, we need this check for direct reference to
9337 reference declarations, which are forbidden by
9338 [8.3.2/5 dcl.ref]. Reference to reference declarations
9339 are only allowed indirectly through typedefs and template
9340 type arguments. Example:
9342 void foo(int & &); // invalid ref-to-ref decl
9344 typedef int & int_ref;
9345 void foo(int_ref &); // valid ref-to-ref decl
9347 if (inner_declarator && inner_declarator->kind == cdk_reference)
9348 error ("cannot declare reference to %q#T, which is not "
9349 "a typedef or a template type argument", type);
9351 else if (TREE_CODE (type) == METHOD_TYPE)
9352 type = build_ptrmemfunc_type (build_pointer_type (type));
9353 else if (declarator->kind == cdk_ptrmem)
9355 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9357 if (declarator->u.pointer.class_type == error_mark_node)
9358 /* We will already have complained. */
9359 type = error_mark_node;
9361 type = build_ptrmem_type (declarator->u.pointer.class_type,
9365 type = build_pointer_type (type);
9367 /* Process a list of type modifier keywords (such as
9368 const or volatile) that were given inside the `*' or `&'. */
9370 if (declarator->u.pointer.qualifiers)
9373 = cp_build_qualified_type (type,
9374 declarator->u.pointer.qualifiers);
9375 type_quals = cp_type_quals (type);
9388 /* We need to stabilize side-effects in VLA sizes for regular array
9389 declarations too, not just pointers to arrays. */
9390 if (type != error_mark_node && !TYPE_NAME (type)
9391 && (decl_context == NORMAL || decl_context == FIELD)
9392 && at_function_scope_p ()
9393 && variably_modified_type_p (type, NULL_TREE))
9394 stabilize_vla_size (TYPE_SIZE (type));
9396 /* A `constexpr' specifier used in an object declaration declares
9397 the object as `const'. */
9398 if (constexpr_p && innermost_code != cdk_function)
9400 if (type_quals & TYPE_QUAL_CONST)
9401 error ("both %<const%> and %<constexpr%> cannot be used here");
9402 if (type_quals & TYPE_QUAL_VOLATILE)
9403 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9404 if (TREE_CODE (type) != REFERENCE_TYPE)
9406 type_quals |= TYPE_QUAL_CONST;
9407 type = cp_build_qualified_type (type, type_quals);
9411 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9412 && TREE_CODE (type) != FUNCTION_TYPE
9413 && TREE_CODE (type) != METHOD_TYPE)
9415 error ("template-id %qD used as a declarator",
9417 unqualified_id = dname;
9420 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9421 qualified with a class-name, turn it into a METHOD_TYPE, unless
9422 we know that the function is static. We take advantage of this
9423 opportunity to do other processing that pertains to entities
9424 explicitly declared to be class members. Note that if DECLARATOR
9425 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9426 would not have exited the loop above. */
9428 && declarator->u.id.qualifying_scope
9429 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9433 ctype = declarator->u.id.qualifying_scope;
9434 ctype = TYPE_MAIN_VARIANT (ctype);
9436 while (t != NULL_TREE && CLASS_TYPE_P (t))
9438 /* You're supposed to have one `template <...>' for every
9439 template class, but you don't need one for a full
9440 specialization. For example:
9442 template <class T> struct S{};
9443 template <> struct S<int> { void f(); };
9444 void S<int>::f () {}
9446 is correct; there shouldn't be a `template <>' for the
9447 definition of `S<int>::f'. */
9448 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9449 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9450 /* T is an explicit (not partial) specialization. All
9451 containing classes must therefore also be explicitly
9454 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9455 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9456 template_count += 1;
9458 t = TYPE_MAIN_DECL (t);
9459 t = DECL_CONTEXT (t);
9462 if (ctype == current_class_type)
9466 permerror (input_location, "member functions are implicitly friends of their class");
9470 permerror (declarator->id_loc,
9471 "extra qualification %<%T::%> on member %qs",
9474 else if (/* If the qualifying type is already complete, then we
9475 can skip the following checks. */
9476 !COMPLETE_TYPE_P (ctype)
9477 && (/* If the function is being defined, then
9478 qualifying type must certainly be complete. */
9480 /* A friend declaration of "T::f" is OK, even if
9481 "T" is a template parameter. But, if this
9482 function is not a friend, the qualifying type
9484 || (!friendp && !CLASS_TYPE_P (ctype))
9485 /* For a declaration, the type need not be
9486 complete, if either it is dependent (since there
9487 is no meaningful definition of complete in that
9488 case) or the qualifying class is currently being
9490 || !(dependent_type_p (ctype)
9491 || currently_open_class (ctype)))
9492 /* Check that the qualifying type is complete. */
9493 && !complete_type_or_else (ctype, NULL_TREE))
9494 return error_mark_node;
9495 else if (TREE_CODE (type) == FUNCTION_TYPE)
9497 if (current_class_type
9498 && (!friendp || funcdef_flag))
9501 ? "cannot define member function %<%T::%s%> within %<%T%>"
9502 : "cannot declare member function %<%T::%s%> within %<%T%>",
9503 ctype, name, current_class_type);
9504 return error_mark_node;
9507 else if (declspecs->specs[(int)ds_typedef]
9508 && current_class_type)
9510 error ("cannot declare member %<%T::%s%> within %qT",
9511 ctype, name, current_class_type);
9512 return error_mark_node;
9516 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9517 ctype = current_class_type;
9519 /* Now TYPE has the actual type. */
9524 *attrlist = chainon (returned_attrs, *attrlist);
9526 attrlist = &returned_attrs;
9529 /* Handle parameter packs. */
9530 if (parameter_pack_p)
9532 if (decl_context == PARM)
9533 /* Turn the type into a pack expansion.*/
9534 type = make_pack_expansion (type);
9536 error ("non-parameter %qs cannot be a parameter pack", name);
9539 /* Did array size calculations overflow? */
9541 if (TREE_CODE (type) == ARRAY_TYPE
9542 && COMPLETE_TYPE_P (type)
9543 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9544 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9546 error ("size of array %qs is too large", name);
9547 /* If we proceed with the array type as it is, we'll eventually
9548 crash in tree_low_cst(). */
9549 type = error_mark_node;
9552 if ((decl_context == FIELD || decl_context == PARM)
9553 && !processing_template_decl
9554 && variably_modified_type_p (type, NULL_TREE))
9556 if (decl_context == FIELD)
9557 error ("data member may not have variably modified type %qT", type);
9559 error ("parameter may not have variably modified type %qT", type);
9560 type = error_mark_node;
9563 if (explicitp == 1 || (explicitp && friendp))
9565 /* [dcl.fct.spec] The explicit specifier shall only be used in
9566 declarations of constructors within a class definition. */
9567 error ("only declarations of constructors can be %<explicit%>");
9571 if (storage_class == sc_mutable)
9573 if (decl_context != FIELD || friendp)
9575 error ("non-member %qs cannot be declared %<mutable%>", name);
9576 storage_class = sc_none;
9578 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9580 error ("non-object member %qs cannot be declared %<mutable%>", name);
9581 storage_class = sc_none;
9583 else if (TREE_CODE (type) == FUNCTION_TYPE
9584 || TREE_CODE (type) == METHOD_TYPE)
9586 error ("function %qs cannot be declared %<mutable%>", name);
9587 storage_class = sc_none;
9591 error ("static %qs cannot be declared %<mutable%>", name);
9592 storage_class = sc_none;
9594 else if (type_quals & TYPE_QUAL_CONST)
9596 error ("const %qs cannot be declared %<mutable%>", name);
9597 storage_class = sc_none;
9599 else if (TREE_CODE (type) == REFERENCE_TYPE)
9601 permerror (input_location, "reference %qs cannot be declared "
9602 "%<mutable%>", name);
9603 storage_class = sc_none;
9607 /* If this is declaring a typedef name, return a TYPE_DECL. */
9608 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9612 /* Note that the grammar rejects storage classes
9613 in typenames, fields or parameters. */
9614 if (current_lang_name == lang_name_java)
9615 TYPE_FOR_JAVA (type) = 1;
9617 /* This declaration:
9619 typedef void f(int) const;
9621 declares a function type which is not a member of any
9622 particular class, but which is cv-qualified; for
9623 example "f S::*" declares a pointer to a const-qualified
9624 member function of S. We record the cv-qualification in the
9626 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9628 type = apply_memfn_quals (type, memfn_quals);
9630 /* We have now dealt with these qualifiers. */
9631 memfn_quals = TYPE_UNQUALIFIED;
9634 if (type_uses_auto (type))
9636 error ("typedef declared %<auto%>");
9637 type = error_mark_node;
9640 if (decl_context == FIELD)
9641 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9643 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9644 if (id_declarator && declarator->u.id.qualifying_scope) {
9645 error_at (DECL_SOURCE_LOCATION (decl),
9646 "typedef name may not be a nested-name-specifier");
9647 TREE_TYPE (decl) = error_mark_node;
9650 if (decl_context != FIELD)
9652 if (!current_function_decl)
9653 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9654 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9655 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9656 (current_function_decl)))
9657 /* The TYPE_DECL is "abstract" because there will be
9658 clones of this constructor/destructor, and there will
9659 be copies of this TYPE_DECL generated in those
9661 DECL_ABSTRACT (decl) = 1;
9663 else if (constructor_name_p (unqualified_id, current_class_type))
9664 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9665 "as enclosing class",
9668 /* If the user declares "typedef struct {...} foo" then the
9669 struct will have an anonymous name. Fill that name in now.
9670 Nothing can refer to it, so nothing needs know about the name
9672 if (type != error_mark_node
9675 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9676 && TYPE_ANONYMOUS_P (type)
9677 && declspecs->type_definition_p
9678 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9682 /* Replace the anonymous name with the real name everywhere. */
9683 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9685 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9686 /* We do not rename the debug info representing the
9687 anonymous tagged type because the standard says in
9688 [dcl.typedef] that the naming applies only for
9689 linkage purposes. */
9690 /*debug_hooks->set_name (t, decl);*/
9691 TYPE_NAME (t) = decl;
9694 if (TYPE_LANG_SPECIFIC (type))
9695 TYPE_WAS_ANONYMOUS (type) = 1;
9697 /* If this is a typedef within a template class, the nested
9698 type is a (non-primary) template. The name for the
9699 template needs updating as well. */
9700 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9701 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9702 = TYPE_IDENTIFIER (type);
9704 /* Adjust linkage now that we aren't anonymous anymore. */
9705 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9706 determine_visibility (TYPE_MAIN_DECL (type));
9708 /* FIXME remangle member functions; member functions of a
9709 type with external linkage have external linkage. */
9713 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9714 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9716 bad_specifiers (decl, BSP_TYPE, virtualp,
9717 memfn_quals != TYPE_UNQUALIFIED,
9718 inlinep, friendp, raises != NULL_TREE);
9723 /* Detect the case of an array type of unspecified size
9724 which came, as such, direct from a typedef name.
9725 We must copy the type, so that the array's domain can be
9726 individually set by the object's initializer. */
9728 if (type && typedef_type
9729 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9730 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9731 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9733 /* Detect where we're using a typedef of function type to declare a
9734 function. PARMS will not be set, so we must create it now. */
9736 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9738 tree decls = NULL_TREE;
9741 for (args = TYPE_ARG_TYPES (type);
9742 args && args != void_list_node;
9743 args = TREE_CHAIN (args))
9745 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9747 DECL_CHAIN (decl) = decls;
9751 parms = nreverse (decls);
9753 if (decl_context != TYPENAME)
9755 /* A cv-qualifier-seq shall only be part of the function type
9756 for a non-static member function. [8.3.5/4 dcl.fct] */
9757 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9758 && (current_class_type == NULL_TREE || staticp) )
9761 ? G_("qualified function types cannot be used to "
9762 "declare static member functions")
9763 : G_("qualified function types cannot be used to "
9764 "declare free functions"));
9765 type = TYPE_MAIN_VARIANT (type);
9768 /* The qualifiers on the function type become the qualifiers on
9769 the non-static member function. */
9770 memfn_quals |= type_memfn_quals (type);
9771 type_quals = TYPE_UNQUALIFIED;
9775 /* If this is a type name (such as, in a cast or sizeof),
9776 compute the type and return it now. */
9778 if (decl_context == TYPENAME)
9780 /* Note that the grammar rejects storage classes
9781 in typenames, fields or parameters. */
9782 if (type_quals != TYPE_UNQUALIFIED)
9783 type_quals = TYPE_UNQUALIFIED;
9785 /* Special case: "friend class foo" looks like a TYPENAME context. */
9788 if (type_quals != TYPE_UNQUALIFIED)
9790 error ("type qualifiers specified for friend class declaration");
9791 type_quals = TYPE_UNQUALIFIED;
9795 error ("%<inline%> specified for friend class declaration");
9801 /* Don't allow friend declaration without a class-key. */
9802 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9803 permerror (input_location, "template parameters cannot be friends");
9804 else if (TREE_CODE (type) == TYPENAME_TYPE)
9805 permerror (input_location, "friend declaration requires class-key, "
9806 "i.e. %<friend class %T::%D%>",
9807 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9809 permerror (input_location, "friend declaration requires class-key, "
9810 "i.e. %<friend %#T%>",
9814 /* Only try to do this stuff if we didn't already give up. */
9815 if (type != integer_type_node)
9817 /* A friendly class? */
9818 if (current_class_type)
9819 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9822 error ("trying to make class %qT a friend of global scope",
9825 type = void_type_node;
9828 else if (memfn_quals)
9830 if (ctype == NULL_TREE
9831 && TREE_CODE (type) == METHOD_TYPE)
9832 ctype = TYPE_METHOD_BASETYPE (type);
9835 type = build_memfn_type (type, ctype, memfn_quals);
9836 /* Core issue #547: need to allow this in template type args. */
9837 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9838 type = apply_memfn_quals (type, memfn_quals);
9840 error ("invalid qualifiers on non-member function type");
9845 else if (unqualified_id == NULL_TREE && decl_context != PARM
9846 && decl_context != CATCHPARM
9847 && TREE_CODE (type) != UNION_TYPE
9850 error ("abstract declarator %qT used as declaration", type);
9851 return error_mark_node;
9854 /* Only functions may be declared using an operator-function-id. */
9856 && IDENTIFIER_OPNAME_P (unqualified_id)
9857 && TREE_CODE (type) != FUNCTION_TYPE
9858 && TREE_CODE (type) != METHOD_TYPE)
9860 error ("declaration of %qD as non-function", unqualified_id);
9861 return error_mark_node;
9864 /* We don't check parameter types here because we can emit a better
9865 error message later. */
9866 if (decl_context != PARM)
9868 type = check_var_type (unqualified_id, type);
9869 if (type == error_mark_node)
9870 return error_mark_node;
9873 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9874 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9876 if (decl_context == PARM || decl_context == CATCHPARM)
9878 if (ctype || in_namespace)
9879 error ("cannot use %<::%> in parameter declaration");
9881 if (type_uses_auto (type))
9883 error ("parameter declared %<auto%>");
9884 type = error_mark_node;
9887 /* A parameter declared as an array of T is really a pointer to T.
9888 One declared as a function is really a pointer to a function.
9889 One declared as a member is really a pointer to member. */
9891 if (TREE_CODE (type) == ARRAY_TYPE)
9893 /* Transfer const-ness of array into that of type pointed to. */
9894 type = build_pointer_type (TREE_TYPE (type));
9895 type_quals = TYPE_UNQUALIFIED;
9897 else if (TREE_CODE (type) == FUNCTION_TYPE)
9898 type = build_pointer_type (type);
9901 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9902 && !NEW_DELETE_OPNAME_P (unqualified_id))
9904 cp_cv_quals real_quals = memfn_quals;
9905 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9906 real_quals |= TYPE_QUAL_CONST;
9907 type = build_memfn_type (type, ctype, real_quals);
9913 if (decl_context == PARM)
9915 decl = cp_build_parm_decl (unqualified_id, type);
9917 bad_specifiers (decl, BSP_PARM, virtualp,
9918 memfn_quals != TYPE_UNQUALIFIED,
9919 inlinep, friendp, raises != NULL_TREE);
9921 else if (decl_context == FIELD)
9923 /* The C99 flexible array extension. */
9924 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9925 && TYPE_DOMAIN (type) == NULL_TREE)
9927 tree itype = compute_array_index_type (dname, integer_zero_node,
9928 tf_warning_or_error);
9929 type = build_cplus_array_type (TREE_TYPE (type), itype);
9932 if (type == error_mark_node)
9934 /* Happens when declaring arrays of sizes which
9935 are error_mark_node, for example. */
9938 else if (in_namespace && !friendp)
9940 /* Something like struct S { int N::j; }; */
9941 error ("invalid use of %<::%>");
9942 return error_mark_node;
9944 else if (TREE_CODE (type) == FUNCTION_TYPE
9945 || TREE_CODE (type) == METHOD_TYPE)
9948 tree function_context;
9952 /* This should never happen in pure C++ (the check
9953 could be an assert). It could happen in
9954 Objective-C++ if someone writes invalid code that
9955 uses a function declaration for an instance
9956 variable or property (instance variables and
9957 properties are parsed as FIELD_DECLs, but they are
9958 part of an Objective-C class, not a C++ class).
9959 That code is invalid and is caught by this
9963 error ("declaration of function %qD in invalid context",
9965 return error_mark_node;
9968 /* ``A union may [ ... ] not [ have ] virtual functions.''
9970 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9972 error ("function %qD declared virtual inside a union",
9974 return error_mark_node;
9977 if (NEW_DELETE_OPNAME_P (unqualified_id))
9981 error ("%qD cannot be declared virtual, since it "
9989 /* Check that the name used for a destructor makes sense. */
9990 if (sfk == sfk_destructor)
9992 tree uqname = id_declarator->u.id.unqualified_name;
9996 gcc_assert (friendp);
9997 error ("expected qualified name in friend declaration "
9998 "for destructor %qD", uqname);
9999 return error_mark_node;
10002 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10004 error ("declaration of %qD as member of %qT",
10006 return error_mark_node;
10010 error ("a destructor cannot be %<constexpr%>");
10011 return error_mark_node;
10014 else if (sfk == sfk_constructor && friendp && !ctype)
10016 error ("expected qualified name in friend declaration "
10017 "for constructor %qD",
10018 id_declarator->u.id.unqualified_name);
10019 return error_mark_node;
10022 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10023 function_context = (ctype != NULL_TREE) ?
10024 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10025 publicp = (! friendp || ! staticp)
10026 && function_context == NULL_TREE;
10027 decl = grokfndecl (ctype, type,
10028 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10029 ? unqualified_id : dname,
10032 virtualp, flags, memfn_quals, raises,
10033 friendp ? -1 : 0, friendp, publicp,
10034 inlinep | (2 * constexpr_p),
10036 funcdef_flag, template_count, in_namespace,
10037 attrlist, declarator->id_loc);
10038 decl = set_virt_specifiers (decl, virt_specifiers);
10039 if (decl == NULL_TREE)
10040 return error_mark_node;
10042 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10043 /* The decl and setting of decl_attr is also turned off. */
10044 decl = build_decl_attribute_variant (decl, decl_attr);
10047 /* [class.conv.ctor]
10049 A constructor declared without the function-specifier
10050 explicit that can be called with a single parameter
10051 specifies a conversion from the type of its first
10052 parameter to the type of its class. Such a constructor
10053 is called a converting constructor. */
10054 if (explicitp == 2)
10055 DECL_NONCONVERTING_P (decl) = 1;
10057 else if (!staticp && !dependent_type_p (type)
10058 && !COMPLETE_TYPE_P (complete_type (type))
10059 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10061 if (unqualified_id)
10062 error ("field %qD has incomplete type", unqualified_id);
10064 error ("name %qT has incomplete type", type);
10066 /* If we're instantiating a template, tell them which
10067 instantiation made the field's type be incomplete. */
10068 if (current_class_type
10069 && TYPE_NAME (current_class_type)
10070 && IDENTIFIER_TEMPLATE (current_class_name)
10072 && declspecs->type == type)
10073 error (" in instantiation of template %qT",
10074 current_class_type);
10076 return error_mark_node;
10082 error ("%qE is neither function nor member function; "
10083 "cannot be declared friend", unqualified_id);
10091 /* Friends are treated specially. */
10092 if (ctype == current_class_type)
10093 ; /* We already issued a permerror. */
10094 else if (decl && DECL_NAME (decl))
10096 if (template_class_depth (current_class_type) == 0)
10098 decl = check_explicit_specialization
10099 (unqualified_id, decl, template_count,
10100 2 * funcdef_flag + 4);
10101 if (decl == error_mark_node)
10102 return error_mark_node;
10105 decl = do_friend (ctype, unqualified_id, decl,
10111 return error_mark_node;
10114 /* Structure field. It may not be a function, except for C++. */
10116 if (decl == NULL_TREE)
10120 /* C++ allows static class members. All other work
10121 for this is done by grokfield. */
10122 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10123 set_linkage_for_static_data_member (decl);
10124 /* Even if there is an in-class initialization, DECL
10125 is considered undefined until an out-of-class
10126 definition is provided. */
10127 DECL_EXTERNAL (decl) = 1;
10130 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10132 if (constexpr_p && !initialized)
10134 error ("constexpr static data member %qD must have an "
10135 "initializer", decl);
10136 constexpr_p = false;
10143 error ("non-static data member %qE declared %<constexpr%>",
10145 constexpr_p = false;
10147 decl = build_decl (input_location,
10148 FIELD_DECL, unqualified_id, type);
10149 DECL_NONADDRESSABLE_P (decl) = bitfield;
10150 if (bitfield && !unqualified_id)
10151 TREE_NO_WARNING (decl) = 1;
10153 if (storage_class == sc_mutable)
10155 DECL_MUTABLE_P (decl) = 1;
10156 storage_class = sc_none;
10160 /* An attempt is being made to initialize a non-static
10161 member. This is new in C++11. */
10162 maybe_warn_cpp0x (CPP0X_NSDMI);
10165 bad_specifiers (decl, BSP_FIELD, virtualp,
10166 memfn_quals != TYPE_UNQUALIFIED,
10167 inlinep, friendp, raises != NULL_TREE);
10170 else if (TREE_CODE (type) == FUNCTION_TYPE
10171 || TREE_CODE (type) == METHOD_TYPE)
10173 tree original_name;
10176 if (!unqualified_id)
10177 return error_mark_node;
10179 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10180 original_name = dname;
10182 original_name = unqualified_id;
10184 if (storage_class == sc_auto)
10185 error ("storage class %<auto%> invalid for function %qs", name);
10186 else if (storage_class == sc_register)
10187 error ("storage class %<register%> invalid for function %qs", name);
10189 error ("storage class %<__thread%> invalid for function %qs", name);
10191 if (virt_specifiers)
10192 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10193 /* Function declaration not at top level.
10194 Storage classes other than `extern' are not allowed
10195 and `extern' makes no difference. */
10196 if (! toplevel_bindings_p ()
10197 && (storage_class == sc_static
10198 || declspecs->specs[(int)ds_inline])
10201 if (storage_class == sc_static)
10202 pedwarn (input_location, OPT_pedantic,
10203 "%<static%> specified invalid for function %qs "
10204 "declared out of global scope", name);
10206 pedwarn (input_location, OPT_pedantic,
10207 "%<inline%> specifier invalid for function %qs "
10208 "declared out of global scope", name);
10211 if (ctype == NULL_TREE)
10215 error ("virtual non-class function %qs", name);
10218 else if (sfk == sfk_constructor
10219 || sfk == sfk_destructor)
10221 error (funcdef_flag
10222 ? "%qs defined in a non-class scope"
10223 : "%qs declared in a non-class scope", name);
10228 /* Record presence of `static'. */
10229 publicp = (ctype != NULL_TREE
10230 || storage_class == sc_extern
10231 || storage_class != sc_static);
10233 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10234 virtualp, flags, memfn_quals, raises,
10236 publicp, inlinep | (2 * constexpr_p), sfk,
10238 template_count, in_namespace, attrlist,
10239 declarator->id_loc);
10240 if (decl == NULL_TREE)
10241 return error_mark_node;
10245 int invalid_static = 0;
10247 /* Don't allow a static member function in a class, and forbid
10248 declaring main to be static. */
10249 if (TREE_CODE (type) == METHOD_TYPE)
10251 permerror (input_location, "cannot declare member function %qD to have "
10252 "static linkage", decl);
10253 invalid_static = 1;
10255 else if (current_function_decl)
10257 /* FIXME need arm citation */
10258 error ("cannot declare static function inside another function");
10259 invalid_static = 1;
10262 if (invalid_static)
10265 storage_class = sc_none;
10271 /* It's a variable. */
10273 /* An uninitialized decl with `extern' is a reference. */
10274 decl = grokvardecl (type, unqualified_id,
10277 (type_quals & TYPE_QUAL_CONST) != 0,
10278 ctype ? ctype : in_namespace);
10279 bad_specifiers (decl, BSP_VAR, virtualp,
10280 memfn_quals != TYPE_UNQUALIFIED,
10281 inlinep, friendp, raises != NULL_TREE);
10285 DECL_CONTEXT (decl) = ctype;
10288 permerror (input_location, "%<static%> may not be used when defining "
10289 "(as opposed to declaring) a static data member");
10291 storage_class = sc_none;
10293 if (storage_class == sc_register && TREE_STATIC (decl))
10295 error ("static member %qD declared %<register%>", decl);
10296 storage_class = sc_none;
10298 if (storage_class == sc_extern && pedantic)
10300 pedwarn (input_location, OPT_pedantic,
10301 "cannot explicitly declare member %q#D to have "
10302 "extern linkage", decl);
10303 storage_class = sc_none;
10306 else if (constexpr_p && DECL_EXTERNAL (decl))
10308 error ("declaration of constexpr variable %qD is not a definition",
10310 constexpr_p = false;
10314 if (storage_class == sc_extern && initialized && !funcdef_flag)
10316 if (toplevel_bindings_p ())
10318 /* It's common practice (and completely valid) to have a const
10319 be initialized and declared extern. */
10320 if (!(type_quals & TYPE_QUAL_CONST))
10321 warning (0, "%qs initialized and declared %<extern%>", name);
10325 error ("%qs has both %<extern%> and initializer", name);
10326 return error_mark_node;
10330 /* Record `register' declaration for warnings on &
10331 and in case doing stupid register allocation. */
10333 if (storage_class == sc_register)
10334 DECL_REGISTER (decl) = 1;
10335 else if (storage_class == sc_extern)
10336 DECL_THIS_EXTERN (decl) = 1;
10337 else if (storage_class == sc_static)
10338 DECL_THIS_STATIC (decl) = 1;
10340 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10341 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10342 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10344 /* Record constancy and volatility on the DECL itself . There's
10345 no need to do this when processing a template; we'll do this
10346 for the instantiated declaration based on the type of DECL. */
10347 if (!processing_template_decl)
10348 cp_apply_type_quals_to_decl (type_quals, decl);
10354 /* Subroutine of start_function. Ensure that each of the parameter
10355 types (as listed in PARMS) is complete, as is required for a
10356 function definition. */
10359 require_complete_types_for_parms (tree parms)
10361 for (; parms; parms = DECL_CHAIN (parms))
10363 if (dependent_type_p (TREE_TYPE (parms)))
10365 if (!VOID_TYPE_P (TREE_TYPE (parms))
10366 && complete_type_or_else (TREE_TYPE (parms), parms))
10368 relayout_decl (parms);
10369 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10372 /* grokparms or complete_type_or_else will have already issued
10374 TREE_TYPE (parms) = error_mark_node;
10378 /* Returns nonzero if T is a local variable. */
10381 local_variable_p (const_tree t)
10383 if ((TREE_CODE (t) == VAR_DECL
10384 /* A VAR_DECL with a context that is a _TYPE is a static data
10386 && !TYPE_P (CP_DECL_CONTEXT (t))
10387 /* Any other non-local variable must be at namespace scope. */
10388 && !DECL_NAMESPACE_SCOPE_P (t))
10389 || (TREE_CODE (t) == PARM_DECL))
10395 /* Like local_variable_p, but suitable for use as a tree-walking
10399 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10400 void *data ATTRIBUTE_UNUSED)
10402 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10404 else if (TYPE_P (*tp))
10405 *walk_subtrees = 0;
10411 /* Check that ARG, which is a default-argument expression for a
10412 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10413 something goes wrong. DECL may also be a _TYPE node, rather than a
10414 DECL, if there is no DECL available. */
10417 check_default_argument (tree decl, tree arg)
10422 if (TREE_CODE (arg) == DEFAULT_ARG)
10423 /* We get a DEFAULT_ARG when looking at an in-class declaration
10424 with a default argument. Ignore the argument for now; we'll
10425 deal with it after the class is complete. */
10434 decl_type = TREE_TYPE (decl);
10436 if (arg == error_mark_node
10437 || decl == error_mark_node
10438 || TREE_TYPE (arg) == error_mark_node
10439 || decl_type == error_mark_node)
10440 /* Something already went wrong. There's no need to check
10442 return error_mark_node;
10444 /* [dcl.fct.default]
10446 A default argument expression is implicitly converted to the
10448 if (!TREE_TYPE (arg)
10449 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10452 error ("default argument for %q#D has type %qT",
10453 decl, TREE_TYPE (arg));
10455 error ("default argument for parameter of type %qT has type %qT",
10456 decl_type, TREE_TYPE (arg));
10458 return error_mark_node;
10461 /* [dcl.fct.default]
10463 Local variables shall not be used in default argument
10466 The keyword `this' shall not be used in a default argument of a
10467 member function. */
10468 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10471 error ("default argument %qE uses local variable %qD", arg, var);
10472 return error_mark_node;
10479 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10482 type_is_deprecated (tree type)
10484 enum tree_code code;
10485 if (TREE_DEPRECATED (type))
10487 if (TYPE_NAME (type)
10488 && TREE_DEPRECATED (TYPE_NAME (type)))
10491 /* Do warn about using typedefs to a deprecated class. */
10492 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10493 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10495 code = TREE_CODE (type);
10497 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10498 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10499 || code == METHOD_TYPE || code == ARRAY_TYPE)
10500 return type_is_deprecated (TREE_TYPE (type));
10502 if (TYPE_PTRMEMFUNC_P (type))
10503 return type_is_deprecated
10504 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10509 /* Decode the list of parameter types for a function type.
10510 Given the list of things declared inside the parens,
10511 return a list of types.
10513 If this parameter does not end with an ellipsis, we append
10516 *PARMS is set to the chain of PARM_DECLs created. */
10519 grokparms (tree parmlist, tree *parms)
10521 tree result = NULL_TREE;
10522 tree decls = NULL_TREE;
10526 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10528 tree type = NULL_TREE;
10529 tree init = TREE_PURPOSE (parm);
10530 tree decl = TREE_VALUE (parm);
10531 const char *errmsg;
10533 if (parm == void_list_node)
10536 if (! decl || TREE_TYPE (decl) == error_mark_node)
10539 type = TREE_TYPE (decl);
10540 if (VOID_TYPE_P (type))
10542 if (same_type_p (type, void_type_node)
10543 && DECL_SELF_REFERENCE_P (type)
10544 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10545 /* this is a parmlist of `(void)', which is ok. */
10547 cxx_incomplete_type_error (decl, type);
10548 /* It's not a good idea to actually create parameters of
10549 type `void'; other parts of the compiler assume that a
10550 void type terminates the parameter list. */
10551 type = error_mark_node;
10552 TREE_TYPE (decl) = error_mark_node;
10555 if (type != error_mark_node
10556 && TYPE_FOR_JAVA (type)
10557 && MAYBE_CLASS_TYPE_P (type))
10559 error ("parameter %qD has Java class type", decl);
10560 type = error_mark_node;
10561 TREE_TYPE (decl) = error_mark_node;
10565 if (type != error_mark_node
10566 && (errmsg = targetm.invalid_parameter_type (type)))
10569 type = error_mark_node;
10570 TREE_TYPE (decl) = error_mark_node;
10573 if (type != error_mark_node)
10575 if (deprecated_state != DEPRECATED_SUPPRESS)
10577 tree deptype = type_is_deprecated (type);
10579 warn_deprecated_use (deptype, NULL_TREE);
10582 /* Top-level qualifiers on the parameters are
10583 ignored for function types. */
10584 type = cp_build_qualified_type (type, 0);
10585 if (TREE_CODE (type) == METHOD_TYPE)
10587 error ("parameter %qD invalidly declared method type", decl);
10588 type = build_pointer_type (type);
10589 TREE_TYPE (decl) = type;
10591 else if (abstract_virtuals_error (decl, type))
10592 any_error = 1; /* Seems like a good idea. */
10593 else if (POINTER_TYPE_P (type))
10595 /* [dcl.fct]/6, parameter types cannot contain pointers
10596 (references) to arrays of unknown bound. */
10597 tree t = TREE_TYPE (type);
10598 int ptr = TYPE_PTR_P (type);
10602 if (TYPE_PTR_P (t))
10604 else if (TREE_CODE (t) != ARRAY_TYPE)
10606 else if (!TYPE_DOMAIN (t))
10610 if (TREE_CODE (t) == ARRAY_TYPE)
10612 ? G_("parameter %qD includes pointer to array of "
10613 "unknown bound %qT")
10614 : G_("parameter %qD includes reference to array of "
10615 "unknown bound %qT"),
10621 else if (init && !processing_template_decl)
10622 init = check_default_argument (decl, init);
10625 DECL_CHAIN (decl) = decls;
10627 result = tree_cons (init, type, result);
10629 decls = nreverse (decls);
10630 result = nreverse (result);
10632 result = chainon (result, void_list_node);
10639 /* D is a constructor or overloaded `operator='.
10641 Let T be the class in which D is declared. Then, this function
10644 -1 if D's is an ill-formed constructor or copy assignment operator
10645 whose first parameter is of type `T'.
10646 0 if D is not a copy constructor or copy assignment
10648 1 if D is a copy constructor or copy assignment operator whose
10649 first parameter is a reference to non-const qualified T.
10650 2 if D is a copy constructor or copy assignment operator whose
10651 first parameter is a reference to const qualified T.
10653 This function can be used as a predicate. Positive values indicate
10654 a copy constructor and nonzero values indicate a copy assignment
10658 copy_fn_p (const_tree d)
10664 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10666 if (TREE_CODE (d) == TEMPLATE_DECL
10667 || (DECL_TEMPLATE_INFO (d)
10668 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10669 /* Instantiations of template member functions are never copy
10670 functions. Note that member functions of templated classes are
10671 represented as template functions internally, and we must
10672 accept those as copy functions. */
10675 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10679 arg_type = TREE_VALUE (args);
10680 if (arg_type == error_mark_node)
10683 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10685 /* Pass by value copy assignment operator. */
10688 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10689 && !TYPE_REF_IS_RVALUE (arg_type)
10690 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10692 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10698 args = TREE_CHAIN (args);
10700 if (args && args != void_list_node && !TREE_PURPOSE (args))
10701 /* There are more non-optional args. */
10707 /* D is a constructor or overloaded `operator='.
10709 Let T be the class in which D is declared. Then, this function
10710 returns true when D is a move constructor or move assignment
10711 operator, false otherwise. */
10714 move_fn_p (const_tree d)
10718 bool result = false;
10720 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10722 if (cxx_dialect == cxx98)
10723 /* There are no move constructors if we are in C++98 mode. */
10726 if (TREE_CODE (d) == TEMPLATE_DECL
10727 || (DECL_TEMPLATE_INFO (d)
10728 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10729 /* Instantiations of template member functions are never copy
10730 functions. Note that member functions of templated classes are
10731 represented as template functions internally, and we must
10732 accept those as copy functions. */
10735 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10739 arg_type = TREE_VALUE (args);
10740 if (arg_type == error_mark_node)
10743 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10744 && TYPE_REF_IS_RVALUE (arg_type)
10745 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10749 args = TREE_CHAIN (args);
10751 if (args && args != void_list_node && !TREE_PURPOSE (args))
10752 /* There are more non-optional args. */
10758 /* Remember any special properties of member function DECL. */
10761 grok_special_member_properties (tree decl)
10765 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10768 class_type = DECL_CONTEXT (decl);
10769 if (DECL_CONSTRUCTOR_P (decl))
10771 int ctor = copy_fn_p (decl);
10773 if (!DECL_ARTIFICIAL (decl))
10774 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10780 A non-template constructor for class X is a copy
10781 constructor if its first parameter is of type X&, const
10782 X&, volatile X& or const volatile X&, and either there
10783 are no other parameters or else all other parameters have
10784 default arguments. */
10785 TYPE_HAS_COPY_CTOR (class_type) = 1;
10786 if (user_provided_p (decl))
10787 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10789 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10791 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10793 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10794 if (user_provided_p (decl))
10795 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10797 else if (move_fn_p (decl) && user_provided_p (decl))
10798 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10799 else if (is_list_ctor (decl))
10800 TYPE_HAS_LIST_CTOR (class_type) = 1;
10802 if (DECL_DECLARED_CONSTEXPR_P (decl)
10803 && !copy_fn_p (decl) && !move_fn_p (decl))
10804 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10806 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10810 A non-template assignment operator for class X is a copy
10811 assignment operator if its parameter is of type X, X&, const
10812 X&, volatile X& or const volatile X&. */
10814 int assop = copy_fn_p (decl);
10818 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10819 if (user_provided_p (decl))
10820 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10822 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10824 else if (move_fn_p (decl) && user_provided_p (decl))
10825 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10827 /* Destructors are handled in check_methods. */
10830 /* Check a constructor DECL has the correct form. Complains
10831 if the class has a constructor of the form X(X). */
10834 grok_ctor_properties (const_tree ctype, const_tree decl)
10836 int ctor_parm = copy_fn_p (decl);
10842 A declaration of a constructor for a class X is ill-formed if
10843 its first parameter is of type (optionally cv-qualified) X
10844 and either there are no other parameters or else all other
10845 parameters have default arguments.
10847 We *don't* complain about member template instantiations that
10848 have this form, though; they can occur as we try to decide
10849 what constructor to use during overload resolution. Since
10850 overload resolution will never prefer such a constructor to
10851 the non-template copy constructor (which is either explicitly
10852 or implicitly defined), there's no need to worry about their
10853 existence. Theoretically, they should never even be
10854 instantiated, but that's hard to forestall. */
10855 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10863 /* An operator with this code is unary, but can also be binary. */
10866 ambi_op_p (enum tree_code code)
10868 return (code == INDIRECT_REF
10869 || code == ADDR_EXPR
10870 || code == UNARY_PLUS_EXPR
10871 || code == NEGATE_EXPR
10872 || code == PREINCREMENT_EXPR
10873 || code == PREDECREMENT_EXPR);
10876 /* An operator with this name can only be unary. */
10879 unary_op_p (enum tree_code code)
10881 return (code == TRUTH_NOT_EXPR
10882 || code == BIT_NOT_EXPR
10883 || code == COMPONENT_REF
10884 || code == TYPE_EXPR);
10887 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10888 errors are issued for invalid declarations. */
10891 grok_op_properties (tree decl, bool complain)
10893 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10895 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10896 tree name = DECL_NAME (decl);
10897 enum tree_code operator_code;
10902 /* Count the number of arguments and check for ellipsis. */
10903 for (argtype = argtypes, arity = 0;
10904 argtype && argtype != void_list_node;
10905 argtype = TREE_CHAIN (argtype))
10907 ellipsis_p = !argtype;
10909 class_type = DECL_CONTEXT (decl);
10910 if (class_type && !CLASS_TYPE_P (class_type))
10911 class_type = NULL_TREE;
10913 if (DECL_CONV_FN_P (decl))
10914 operator_code = TYPE_EXPR;
10918 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10919 if (ansi_opname (CODE) == name) \
10921 operator_code = (CODE); \
10924 else if (ansi_assopname (CODE) == name) \
10926 operator_code = (CODE); \
10927 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10931 #include "operators.def"
10932 #undef DEF_OPERATOR
10934 gcc_unreachable ();
10937 gcc_assert (operator_code != MAX_TREE_CODES);
10938 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10941 switch (operator_code)
10944 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10948 TYPE_GETS_DELETE (class_type) |= 1;
10952 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10955 case VEC_DELETE_EXPR:
10956 TYPE_GETS_DELETE (class_type) |= 2;
10963 /* [basic.std.dynamic.allocation]/1:
10965 A program is ill-formed if an allocation function is declared
10966 in a namespace scope other than global scope or declared static
10969 The same also holds true for deallocation functions. */
10970 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10971 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10973 if (DECL_NAMESPACE_SCOPE_P (decl))
10975 if (CP_DECL_CONTEXT (decl) != global_namespace)
10977 error ("%qD may not be declared within a namespace", decl);
10980 else if (!TREE_PUBLIC (decl))
10982 error ("%qD may not be declared as static", decl);
10988 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10990 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10991 DECL_IS_OPERATOR_NEW (decl) = 1;
10993 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10994 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10997 /* An operator function must either be a non-static member function
10998 or have at least one parameter of a class, a reference to a class,
10999 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11000 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11002 if (operator_code == TYPE_EXPR
11003 || operator_code == CALL_EXPR
11004 || operator_code == COMPONENT_REF
11005 || operator_code == ARRAY_REF
11006 || operator_code == NOP_EXPR)
11008 error ("%qD must be a nonstatic member function", decl);
11015 if (DECL_STATIC_FUNCTION_P (decl))
11017 error ("%qD must be either a non-static member "
11018 "function or a non-member function", decl);
11022 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11024 tree arg = non_reference (TREE_VALUE (p));
11025 if (arg == error_mark_node)
11028 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11029 because these checks are performed even on
11030 template functions. */
11031 if (MAYBE_CLASS_TYPE_P (arg)
11032 || TREE_CODE (arg) == ENUMERAL_TYPE)
11036 if (!p || p == void_list_node)
11039 error ("%qD must have an argument of class or "
11040 "enumerated type", decl);
11046 /* There are no restrictions on the arguments to an overloaded
11048 if (operator_code == CALL_EXPR)
11051 /* Warn about conversion operators that will never be used. */
11052 if (IDENTIFIER_TYPENAME_P (name)
11053 && ! DECL_TEMPLATE_INFO (decl)
11055 /* Warn only declaring the function; there is no need to
11056 warn again about out-of-class definitions. */
11057 && class_type == current_class_type)
11059 tree t = TREE_TYPE (name);
11060 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11063 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11065 if (TREE_CODE (t) == VOID_TYPE)
11066 warning (OPT_Wconversion,
11068 ? G_("conversion to a reference to void "
11069 "will never use a type conversion operator")
11070 : G_("conversion to void "
11071 "will never use a type conversion operator"));
11072 else if (class_type)
11074 if (t == class_type)
11075 warning (OPT_Wconversion,
11077 ? G_("conversion to a reference to the same type "
11078 "will never use a type conversion operator")
11079 : G_("conversion to the same type "
11080 "will never use a type conversion operator"));
11081 /* Don't force t to be complete here. */
11082 else if (MAYBE_CLASS_TYPE_P (t)
11083 && COMPLETE_TYPE_P (t)
11084 && DERIVED_FROM_P (t, class_type))
11085 warning (OPT_Wconversion,
11087 ? G_("conversion to a reference to a base class "
11088 "will never use a type conversion operator")
11089 : G_("conversion to a base class "
11090 "will never use a type conversion operator"));
11095 if (operator_code == COND_EXPR)
11098 error ("ISO C++ prohibits overloading operator ?:");
11101 else if (ellipsis_p)
11103 error ("%qD must not have variable number of arguments", decl);
11106 else if (ambi_op_p (operator_code))
11109 /* We pick the one-argument operator codes by default, so
11110 we don't have to change anything. */
11112 else if (arity == 2)
11114 /* If we thought this was a unary operator, we now know
11115 it to be a binary operator. */
11116 switch (operator_code)
11119 operator_code = MULT_EXPR;
11123 operator_code = BIT_AND_EXPR;
11126 case UNARY_PLUS_EXPR:
11127 operator_code = PLUS_EXPR;
11131 operator_code = MINUS_EXPR;
11134 case PREINCREMENT_EXPR:
11135 operator_code = POSTINCREMENT_EXPR;
11138 case PREDECREMENT_EXPR:
11139 operator_code = POSTDECREMENT_EXPR;
11143 gcc_unreachable ();
11146 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11148 if ((operator_code == POSTINCREMENT_EXPR
11149 || operator_code == POSTDECREMENT_EXPR)
11150 && ! processing_template_decl
11151 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11154 error ("postfix %qD must take %<int%> as its argument",
11157 error ("postfix %qD must take %<int%> as its second "
11165 error ("%qD must take either zero or one argument", decl);
11167 error ("%qD must take either one or two arguments", decl);
11171 /* More Effective C++ rule 6. */
11173 && (operator_code == POSTINCREMENT_EXPR
11174 || operator_code == POSTDECREMENT_EXPR
11175 || operator_code == PREINCREMENT_EXPR
11176 || operator_code == PREDECREMENT_EXPR))
11178 tree arg = TREE_VALUE (argtypes);
11179 tree ret = TREE_TYPE (TREE_TYPE (decl));
11180 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11181 arg = TREE_TYPE (arg);
11182 arg = TYPE_MAIN_VARIANT (arg);
11183 if (operator_code == PREINCREMENT_EXPR
11184 || operator_code == PREDECREMENT_EXPR)
11186 if (TREE_CODE (ret) != REFERENCE_TYPE
11187 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11189 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11190 build_reference_type (arg));
11194 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11195 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11199 else if (unary_op_p (operator_code))
11204 error ("%qD must take %<void%>", decl);
11206 error ("%qD must take exactly one argument", decl);
11210 else /* if (binary_op_p (operator_code)) */
11215 error ("%qD must take exactly one argument", decl);
11217 error ("%qD must take exactly two arguments", decl);
11221 /* More Effective C++ rule 7. */
11223 && (operator_code == TRUTH_ANDIF_EXPR
11224 || operator_code == TRUTH_ORIF_EXPR
11225 || operator_code == COMPOUND_EXPR))
11226 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11230 /* Effective C++ rule 23. */
11233 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11234 && (operator_code == PLUS_EXPR
11235 || operator_code == MINUS_EXPR
11236 || operator_code == TRUNC_DIV_EXPR
11237 || operator_code == MULT_EXPR
11238 || operator_code == TRUNC_MOD_EXPR)
11239 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11240 warning (OPT_Weffc__, "%qD should return by value", decl);
11242 /* [over.oper]/8 */
11243 for (; argtypes && argtypes != void_list_node;
11244 argtypes = TREE_CHAIN (argtypes))
11245 if (TREE_PURPOSE (argtypes))
11247 TREE_PURPOSE (argtypes) = NULL_TREE;
11248 if (operator_code == POSTINCREMENT_EXPR
11249 || operator_code == POSTDECREMENT_EXPR)
11251 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11256 error ("%qD cannot have default arguments", decl);
11264 /* Return a string giving the keyword associate with CODE. */
11266 static const char *
11267 tag_name (enum tag_types code)
11279 case typename_type:
11282 gcc_unreachable ();
11286 /* Name lookup in an elaborated-type-specifier (after the keyword
11287 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11288 elaborated-type-specifier is invalid, issue a diagnostic and return
11289 error_mark_node; otherwise, return the *_TYPE to which it referred.
11290 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11293 check_elaborated_type_specifier (enum tag_types tag_code,
11295 bool allow_template_p)
11301 struct S { struct S *p; };
11303 name lookup will find the TYPE_DECL for the implicit "S::S"
11304 typedef. Adjust for that here. */
11305 if (DECL_SELF_REFERENCE_P (decl))
11306 decl = TYPE_NAME (TREE_TYPE (decl));
11308 type = TREE_TYPE (decl);
11310 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11311 is false for this case as well. */
11312 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11314 error ("using template type parameter %qT after %qs",
11315 type, tag_name (tag_code));
11316 return error_mark_node;
11320 If the identifier resolves to a typedef-name or a template
11321 type-parameter, the elaborated-type-specifier is ill-formed.
11323 In other words, the only legitimate declaration to use in the
11324 elaborated type specifier is the implicit typedef created when
11325 the type is declared. */
11326 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11327 && !DECL_SELF_REFERENCE_P (decl)
11328 && tag_code != typename_type)
11330 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11331 error ("%q+D has a previous declaration here", decl);
11332 return error_mark_node;
11334 else if (TREE_CODE (type) != RECORD_TYPE
11335 && TREE_CODE (type) != UNION_TYPE
11336 && tag_code != enum_type
11337 && tag_code != typename_type)
11339 error ("%qT referred to as %qs", type, tag_name (tag_code));
11340 error ("%q+T has a previous declaration here", type);
11341 return error_mark_node;
11343 else if (TREE_CODE (type) != ENUMERAL_TYPE
11344 && tag_code == enum_type)
11346 error ("%qT referred to as enum", type);
11347 error ("%q+T has a previous declaration here", type);
11348 return error_mark_node;
11350 else if (!allow_template_p
11351 && TREE_CODE (type) == RECORD_TYPE
11352 && CLASSTYPE_IS_TEMPLATE (type))
11354 /* If a class template appears as elaborated type specifier
11355 without a template header such as:
11357 template <class T> class C {};
11358 void f(class C); // No template header here
11360 then the required template argument is missing. */
11361 error ("template argument required for %<%s %T%>",
11362 tag_name (tag_code),
11363 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11364 return error_mark_node;
11370 /* Lookup NAME in elaborate type specifier in scope according to
11371 SCOPE and issue diagnostics if necessary.
11372 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11373 found, and ERROR_MARK_NODE for type error. */
11376 lookup_and_check_tag (enum tag_types tag_code, tree name,
11377 tag_scope scope, bool template_header_p)
11381 if (scope == ts_global)
11383 /* First try ordinary name lookup, ignoring hidden class name
11384 injected via friend declaration. */
11385 decl = lookup_name_prefer_type (name, 2);
11386 /* If that fails, the name will be placed in the smallest
11387 non-class, non-function-prototype scope according to 3.3.1/5.
11388 We may already have a hidden name declared as friend in this
11389 scope. So lookup again but not ignoring hidden names.
11390 If we find one, that name will be made visible rather than
11391 creating a new tag. */
11393 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11396 decl = lookup_type_scope (name, scope);
11398 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11399 decl = DECL_TEMPLATE_RESULT (decl);
11401 if (decl && TREE_CODE (decl) == TYPE_DECL)
11403 /* Look for invalid nested type:
11407 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11409 error ("%qD has the same name as the class in which it is "
11412 return error_mark_node;
11415 /* Two cases we need to consider when deciding if a class
11416 template is allowed as an elaborated type specifier:
11417 1. It is a self reference to its own class.
11418 2. It comes with a template header.
11422 template <class T> class C {
11423 class C *c1; // DECL_SELF_REFERENCE_P is true
11426 template <class U> class C; // template_header_p is true
11427 template <class T> class C<T>::D {
11428 class C *c2; // DECL_SELF_REFERENCE_P is true
11431 t = check_elaborated_type_specifier (tag_code,
11434 | DECL_SELF_REFERENCE_P (decl));
11437 else if (decl && TREE_CODE (decl) == TREE_LIST)
11439 error ("reference to %qD is ambiguous", name);
11440 print_candidates (decl);
11441 return error_mark_node;
11447 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11448 Define the tag as a forward-reference if it is not defined.
11450 If a declaration is given, process it here, and report an error if
11451 multiple declarations are not identical.
11453 SCOPE is TS_CURRENT when this is also a definition. Only look in
11454 the current frame for the name (since C++ allows new names in any
11455 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11456 declaration. Only look beginning from the current scope outward up
11457 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11459 TEMPLATE_HEADER_P is true when this declaration is preceded by
11460 a set of template parameters. */
11463 xref_tag_1 (enum tag_types tag_code, tree name,
11464 tag_scope scope, bool template_header_p)
11466 enum tree_code code;
11468 tree context = NULL_TREE;
11470 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11476 code = RECORD_TYPE;
11482 code = ENUMERAL_TYPE;
11485 gcc_unreachable ();
11488 /* In case of anonymous name, xref_tag is only called to
11489 make type node and push name. Name lookup is not required. */
11490 if (ANON_AGGRNAME_P (name))
11493 t = lookup_and_check_tag (tag_code, name,
11494 scope, template_header_p);
11496 if (t == error_mark_node)
11497 return error_mark_node;
11499 if (scope != ts_current && t && current_class_type
11500 && template_class_depth (current_class_type)
11501 && template_header_p)
11503 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11504 definition of this tag. Since, in addition, we are currently
11505 processing a (member) template declaration of a template
11506 class, we must be very careful; consider:
11513 { template <class V>
11514 friend struct S1; };
11516 Here, the S2::S1 declaration should not be confused with the
11517 outer declaration. In particular, the inner version should
11518 have a template parameter of level 2, not level 1. This
11519 would be particularly important if the member declaration
11522 template <class V = U> friend struct S1;
11524 say, when we should tsubst into `U' when instantiating
11525 S2. On the other hand, when presented with:
11535 we must find the inner binding eventually. We
11536 accomplish this by making sure that the new type we
11537 create to represent this declaration has the right
11539 context = TYPE_CONTEXT (t);
11545 /* If no such tag is yet defined, create a forward-reference node
11546 and record it as the "definition".
11547 When a real declaration of this type is found,
11548 the forward-reference will be altered into a real type. */
11549 if (code == ENUMERAL_TYPE)
11551 error ("use of enum %q#D without previous declaration", name);
11552 return error_mark_node;
11556 t = make_class_type (code);
11557 TYPE_CONTEXT (t) = context;
11558 t = pushtag (name, t, scope);
11563 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11565 if (!redeclare_class_template (t, current_template_parms))
11566 return error_mark_node;
11568 else if (!processing_template_decl
11569 && CLASS_TYPE_P (t)
11570 && CLASSTYPE_IS_TEMPLATE (t))
11572 error ("redeclaration of %qT as a non-template", t);
11573 error ("previous declaration %q+D", t);
11574 return error_mark_node;
11577 /* Make injected friend class visible. */
11578 if (scope != ts_within_enclosing_non_class
11579 && hidden_name_p (TYPE_NAME (t)))
11581 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11582 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11584 if (TYPE_TEMPLATE_INFO (t))
11586 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11587 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11595 /* Wrapper for xref_tag_1. */
11598 xref_tag (enum tag_types tag_code, tree name,
11599 tag_scope scope, bool template_header_p)
11603 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11604 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11605 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11611 xref_tag_from_type (tree old, tree id, tag_scope scope)
11613 enum tag_types tag_kind;
11615 if (TREE_CODE (old) == RECORD_TYPE)
11616 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11618 tag_kind = union_type;
11620 if (id == NULL_TREE)
11621 id = TYPE_IDENTIFIER (old);
11623 return xref_tag (tag_kind, id, scope, false);
11626 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11627 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11628 access_* node, and the TREE_VALUE is the type of the base-class.
11629 Non-NULL TREE_TYPE indicates virtual inheritance.
11631 Returns true if the binfo hierarchy was successfully created,
11632 false if an error was detected. */
11635 xref_basetypes (tree ref, tree base_list)
11638 tree binfo, base_binfo;
11639 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11640 unsigned max_bases = 0; /* Maximum direct bases. */
11642 tree default_access;
11643 tree igo_prev; /* Track Inheritance Graph Order. */
11645 if (ref == error_mark_node)
11648 /* The base of a derived class is private by default, all others are
11650 default_access = (TREE_CODE (ref) == RECORD_TYPE
11651 && CLASSTYPE_DECLARED_CLASS (ref)
11652 ? access_private_node : access_public_node);
11654 /* First, make sure that any templates in base-classes are
11655 instantiated. This ensures that if we call ourselves recursively
11656 we do not get confused about which classes are marked and which
11658 basep = &base_list;
11661 tree basetype = TREE_VALUE (*basep);
11663 if (!(processing_template_decl && uses_template_parms (basetype))
11664 && !complete_type_or_else (basetype, NULL))
11665 /* An incomplete type. Remove it from the list. */
11666 *basep = TREE_CHAIN (*basep);
11670 if (TREE_TYPE (*basep))
11672 if (CLASS_TYPE_P (basetype))
11673 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11674 basep = &TREE_CHAIN (*basep);
11678 TYPE_MARKED_P (ref) = 1;
11680 /* The binfo slot should be empty, unless this is an (ill-formed)
11682 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11684 error ("redefinition of %q#T", ref);
11688 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11690 binfo = make_tree_binfo (max_bases);
11692 TYPE_BINFO (ref) = binfo;
11693 BINFO_OFFSET (binfo) = size_zero_node;
11694 BINFO_TYPE (binfo) = ref;
11696 /* Apply base-class info set up to the variants of this type. */
11697 fixup_type_variants (ref);
11701 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11702 /* An aggregate cannot have baseclasses. */
11703 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11705 if (TREE_CODE (ref) == UNION_TYPE)
11707 error ("derived union %qT invalid", ref);
11714 if (TYPE_FOR_JAVA (ref))
11716 error ("Java class %qT cannot have multiple bases", ref);
11723 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11725 if (TYPE_FOR_JAVA (ref))
11727 error ("Java class %qT cannot have virtual bases", ref);
11732 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11734 tree access = TREE_PURPOSE (base_list);
11735 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11736 tree basetype = TREE_VALUE (base_list);
11738 if (access == access_default_node)
11739 access = default_access;
11741 if (PACK_EXPANSION_P (basetype))
11742 basetype = PACK_EXPANSION_PATTERN (basetype);
11743 if (TREE_CODE (basetype) == TYPE_DECL)
11744 basetype = TREE_TYPE (basetype);
11745 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11747 error ("base type %qT fails to be a struct or class type",
11752 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11753 TYPE_FOR_JAVA (ref) = 1;
11755 base_binfo = NULL_TREE;
11756 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11758 base_binfo = TYPE_BINFO (basetype);
11759 /* The original basetype could have been a typedef'd type. */
11760 basetype = BINFO_TYPE (base_binfo);
11762 /* Inherit flags from the base. */
11763 TYPE_HAS_NEW_OPERATOR (ref)
11764 |= TYPE_HAS_NEW_OPERATOR (basetype);
11765 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11766 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11767 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11768 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11769 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11770 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11771 CLASSTYPE_REPEATED_BASE_P (ref)
11772 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11775 /* We must do this test after we've seen through a typedef
11777 if (TYPE_MARKED_P (basetype))
11779 if (basetype == ref)
11780 error ("recursive type %qT undefined", basetype);
11782 error ("duplicate base type %qT invalid", basetype);
11786 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11787 /* Regenerate the pack expansion for the bases. */
11788 basetype = make_pack_expansion (basetype);
11790 TYPE_MARKED_P (basetype) = 1;
11792 base_binfo = copy_binfo (base_binfo, basetype, ref,
11793 &igo_prev, via_virtual);
11794 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11795 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11797 BINFO_BASE_APPEND (binfo, base_binfo);
11798 BINFO_BASE_ACCESS_APPEND (binfo, access);
11801 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11802 /* If we have space in the vbase vector, we must have shared at
11803 least one of them, and are therefore diamond shaped. */
11804 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11806 /* Unmark all the types. */
11807 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11808 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11809 TYPE_MARKED_P (ref) = 0;
11811 /* Now see if we have a repeated base type. */
11812 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11814 for (base_binfo = binfo; base_binfo;
11815 base_binfo = TREE_CHAIN (base_binfo))
11817 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11819 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11822 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11824 for (base_binfo = binfo; base_binfo;
11825 base_binfo = TREE_CHAIN (base_binfo))
11826 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11827 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11836 /* Copies the enum-related properties from type SRC to type DST.
11837 Used with the underlying type of an enum and the enum itself. */
11839 copy_type_enum (tree dst, tree src)
11841 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11842 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11843 TYPE_SIZE (dst) = TYPE_SIZE (src);
11844 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11845 SET_TYPE_MODE (dst, TYPE_MODE (src));
11846 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11847 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11848 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11849 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11852 /* Begin compiling the definition of an enumeration type.
11855 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11857 UNDERLYING_TYPE is the type that will be used as the storage for
11858 the enumeration type. This should be NULL_TREE if no storage type
11861 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11863 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11865 Returns the type object, as yet incomplete.
11866 Also records info about it so that build_enumerator
11867 may be used to declare the individual values as they are read. */
11870 start_enum (tree name, tree enumtype, tree underlying_type,
11871 bool scoped_enum_p, bool *is_new)
11873 tree prevtype = NULL_TREE;
11874 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11878 /* [C++0x dcl.enum]p5:
11880 If not explicitly specified, the underlying type of a scoped
11881 enumeration type is int. */
11882 if (!underlying_type && scoped_enum_p)
11883 underlying_type = integer_type_node;
11885 if (underlying_type)
11886 underlying_type = cv_unqualified (underlying_type);
11888 /* If this is the real definition for a previous forward reference,
11889 fill in the contents in the same object that used to be the
11890 forward reference. */
11892 enumtype = lookup_and_check_tag (enum_type, name,
11893 /*tag_scope=*/ts_current,
11894 /*template_header_p=*/false);
11896 /* In case of a template_decl, the only check that should be deferred
11897 to instantiation time is the comparison of underlying types. */
11898 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11900 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11902 error_at (input_location, "scoped/unscoped mismatch "
11903 "in enum %q#T", enumtype);
11904 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11905 "previous definition here");
11906 enumtype = error_mark_node;
11908 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11910 error_at (input_location, "underlying type mismatch "
11911 "in enum %q#T", enumtype);
11912 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11913 "previous definition here");
11914 enumtype = error_mark_node;
11916 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11917 && !dependent_type_p (underlying_type)
11918 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11919 && !same_type_p (underlying_type,
11920 ENUM_UNDERLYING_TYPE (enumtype)))
11922 error_at (input_location, "different underlying type "
11923 "in enum %q#T", enumtype);
11924 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11925 "previous definition here");
11926 underlying_type = NULL_TREE;
11930 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11931 || processing_template_decl)
11933 /* In case of error, make a dummy enum to allow parsing to
11935 if (enumtype == error_mark_node)
11937 name = make_anon_name ();
11938 enumtype = NULL_TREE;
11941 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11942 of an opaque enum, or an opaque enum of an already defined
11943 enumeration (C++0x only).
11944 In any other case, it'll be NULL_TREE. */
11950 prevtype = enumtype;
11951 enumtype = cxx_make_type (ENUMERAL_TYPE);
11952 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11953 if (enumtype == error_mark_node)
11954 return error_mark_node;
11956 /* The enum is considered opaque until the opening '{' of the
11957 enumerator list. */
11958 SET_OPAQUE_ENUM_P (enumtype, true);
11959 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11962 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11964 if (underlying_type)
11966 if (CP_INTEGRAL_TYPE_P (underlying_type))
11968 copy_type_enum (enumtype, underlying_type);
11969 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11971 else if (dependent_type_p (underlying_type))
11972 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11974 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11975 underlying_type, enumtype);
11978 /* If into a template class, the returned enum is always the first
11979 declaration (opaque or not) seen. This way all the references to
11980 this type will be to the same declaration. The following ones are used
11981 only to check for definition errors. */
11982 if (prevtype && processing_template_decl)
11988 /* After processing and defining all the values of an enumeration type,
11989 install their decls in the enumeration type.
11990 ENUMTYPE is the type object. */
11993 finish_enum_value_list (tree enumtype)
11996 tree underlying_type;
11999 tree minnode, maxnode;
12002 bool fixed_underlying_type_p
12003 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12005 /* We built up the VALUES in reverse order. */
12006 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12008 /* For an enum defined in a template, just set the type of the values;
12009 all further processing is postponed until the template is
12010 instantiated. We need to set the type so that tsubst of a CONST_DECL
12012 if (processing_template_decl)
12014 for (values = TYPE_VALUES (enumtype);
12016 values = TREE_CHAIN (values))
12017 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12021 /* Determine the minimum and maximum values of the enumerators. */
12022 if (TYPE_VALUES (enumtype))
12024 minnode = maxnode = NULL_TREE;
12026 for (values = TYPE_VALUES (enumtype);
12028 values = TREE_CHAIN (values))
12030 decl = TREE_VALUE (values);
12032 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12033 each enumerator has the type of its enumeration. Prior to the
12034 closing brace, the type of each enumerator is the type of its
12035 initializing value. */
12036 TREE_TYPE (decl) = enumtype;
12038 /* Update the minimum and maximum values, if appropriate. */
12039 value = DECL_INITIAL (decl);
12040 if (value == error_mark_node)
12041 value = integer_zero_node;
12042 /* Figure out what the minimum and maximum values of the
12043 enumerators are. */
12045 minnode = maxnode = value;
12046 else if (tree_int_cst_lt (maxnode, value))
12048 else if (tree_int_cst_lt (value, minnode))
12055 If the enumerator-list is empty, the underlying type is as if
12056 the enumeration had a single enumerator with value 0. */
12057 minnode = maxnode = integer_zero_node;
12059 if (!fixed_underlying_type_p)
12061 /* Compute the number of bits require to represent all values of the
12062 enumeration. We must do this before the type of MINNODE and
12063 MAXNODE are transformed, since tree_int_cst_min_precision relies
12064 on the TREE_TYPE of the value it is passed. */
12065 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12066 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12067 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12068 int precision = MAX (lowprec, highprec);
12070 bool use_short_enum;
12072 /* Determine the underlying type of the enumeration.
12076 The underlying type of an enumeration is an integral type that
12077 can represent all the enumerator values defined in the
12078 enumeration. It is implementation-defined which integral type is
12079 used as the underlying type for an enumeration except that the
12080 underlying type shall not be larger than int unless the value of
12081 an enumerator cannot fit in an int or unsigned int.
12083 We use "int" or an "unsigned int" as the underlying type, even if
12084 a smaller integral type would work, unless the user has
12085 explicitly requested that we use the smallest possible type. The
12086 user can request that for all enumerations with a command line
12087 flag, or for just one enumeration with an attribute. */
12089 use_short_enum = flag_short_enums
12090 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12092 for (itk = (use_short_enum ? itk_char : itk_int);
12096 underlying_type = integer_types[itk];
12097 if (underlying_type != NULL_TREE
12098 && TYPE_PRECISION (underlying_type) >= precision
12099 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12102 if (itk == itk_none)
12106 IF no integral type can represent all the enumerator values, the
12107 enumeration is ill-formed. */
12108 error ("no integral type can represent all of the enumerator values "
12109 "for %qT", enumtype);
12110 precision = TYPE_PRECISION (long_long_integer_type_node);
12111 underlying_type = integer_types[itk_unsigned_long_long];
12116 The value of sizeof() applied to an enumeration type, an object
12117 of an enumeration type, or an enumerator, is the value of sizeof()
12118 applied to the underlying type. */
12119 copy_type_enum (enumtype, underlying_type);
12121 /* Compute the minimum and maximum values for the type.
12125 For an enumeration where emin is the smallest enumerator and emax
12126 is the largest, the values of the enumeration are the values of the
12127 underlying type in the range bmin to bmax, where bmin and bmax are,
12128 respectively, the smallest and largest values of the smallest bit-
12129 field that can store emin and emax. */
12131 /* The middle-end currently assumes that types with TYPE_PRECISION
12132 narrower than their underlying type are suitably zero or sign
12133 extended to fill their mode. Similarly, it assumes that the front
12134 end assures that a value of a particular type must be within
12135 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12137 We used to set these fields based on bmin and bmax, but that led
12138 to invalid assumptions like optimizing away bounds checking. So
12139 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12140 TYPE_MAX_VALUE to the values for the mode above and only restrict
12141 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12142 ENUM_UNDERLYING_TYPE (enumtype)
12143 = build_distinct_type_copy (underlying_type);
12144 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12145 set_min_and_max_values_for_integral_type
12146 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12148 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12149 if (flag_strict_enums)
12150 set_min_and_max_values_for_integral_type (enumtype, precision,
12154 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12156 /* Convert each of the enumerators to the type of the underlying
12157 type of the enumeration. */
12158 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12160 location_t saved_location;
12162 decl = TREE_VALUE (values);
12163 saved_location = input_location;
12164 input_location = DECL_SOURCE_LOCATION (decl);
12165 if (fixed_underlying_type_p)
12166 /* If the enumeration type has a fixed underlying type, we
12167 already checked all of the enumerator values. */
12168 value = DECL_INITIAL (decl);
12170 value = perform_implicit_conversion (underlying_type,
12171 DECL_INITIAL (decl),
12172 tf_warning_or_error);
12173 input_location = saved_location;
12175 /* Do not clobber shared ints. */
12176 value = copy_node (value);
12178 TREE_TYPE (value) = enumtype;
12179 DECL_INITIAL (decl) = value;
12182 /* Fix up all variant types of this enum type. */
12183 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12184 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12186 /* Finish debugging output for this type. */
12187 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12190 /* Finishes the enum type. This is called only the first time an
12191 enumeration is seen, be it opaque or odinary.
12192 ENUMTYPE is the type object. */
12195 finish_enum (tree enumtype)
12197 if (processing_template_decl)
12199 if (at_function_scope_p ())
12200 add_stmt (build_min (TAG_DEFN, enumtype));
12204 /* Here there should not be any variants of this type. */
12205 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12206 && !TYPE_NEXT_VARIANT (enumtype));
12209 /* Build and install a CONST_DECL for an enumeration constant of the
12210 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12211 LOC is the location of NAME.
12212 Assignment of sequential values by default is handled here. */
12215 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12221 /* If the VALUE was erroneous, pretend it wasn't there; that will
12222 result in the enum being assigned the next value in sequence. */
12223 if (value == error_mark_node)
12226 /* Remove no-op casts from the value. */
12228 STRIP_TYPE_NOPS (value);
12230 if (! processing_template_decl)
12232 /* Validate and default VALUE. */
12233 if (value != NULL_TREE)
12235 value = cxx_constant_value (value);
12237 if (TREE_CODE (value) == INTEGER_CST
12238 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12240 value = perform_integral_promotions (value);
12244 error ("enumerator value for %qD is not an integer constant", name);
12249 /* Default based on previous value. */
12250 if (value == NULL_TREE)
12252 if (TYPE_VALUES (enumtype))
12255 unsigned HOST_WIDE_INT lo;
12259 /* C++03 7.2/4: If no initializer is specified for the first
12260 enumerator, the type is an unspecified integral
12261 type. Otherwise the type is the same as the type of the
12262 initializing value of the preceding enumerator unless the
12263 incremented value is not representable in that type, in
12264 which case the type is an unspecified integral type
12265 sufficient to contain the incremented value. */
12266 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12267 if (error_operand_p (prev_value))
12268 value = error_mark_node;
12271 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12272 TREE_INT_CST_HIGH (prev_value),
12277 tree type = TREE_TYPE (prev_value);
12278 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12279 di.low = lo; di.high = hi;
12280 if (!double_int_fits_to_tree_p (type, di))
12283 for (itk = itk_int; itk != itk_none; itk++)
12285 type = integer_types[itk];
12286 if (type != NULL_TREE
12287 && (pos || !TYPE_UNSIGNED (type))
12288 && double_int_fits_to_tree_p (type, di))
12291 if (type && cxx_dialect < cxx0x
12292 && itk > itk_unsigned_long)
12293 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12294 incremented enumerator value is too large for %<unsigned long%>" : "\
12295 incremented enumerator value is too large for %<long%>");
12297 if (type == NULL_TREE)
12300 value = double_int_to_tree (type, di);
12305 error ("overflow in enumeration values at %qD", name);
12306 value = error_mark_node;
12311 value = integer_zero_node;
12314 /* Remove no-op casts from the value. */
12315 STRIP_TYPE_NOPS (value);
12317 /* If the underlying type of the enum is fixed, check whether
12318 the enumerator values fits in the underlying type. If it
12319 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12320 if (ENUM_UNDERLYING_TYPE (enumtype)
12322 && TREE_CODE (value) == INTEGER_CST
12323 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12325 error ("enumerator value %E is too large for underlying type %<%T%>",
12326 value, ENUM_UNDERLYING_TYPE (enumtype));
12328 /* Silently convert the value so that we can continue. */
12329 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12334 /* C++ associates enums with global, function, or class declarations. */
12335 context = current_scope ();
12337 /* Build the actual enumeration constant. Note that the enumeration
12338 constants have the underlying type of the enum (if it is fixed)
12339 or the type of their initializer (if the underlying type of the
12340 enum is not fixed):
12344 If the underlying type is fixed, the type of each enumerator
12345 prior to the closing brace is the underlying type; if the
12346 initializing value of an enumerator cannot be represented by
12347 the underlying type, the program is ill-formed. If the
12348 underlying type is not fixed, the type of each enumerator is
12349 the type of its initializing value.
12351 If the underlying type is not fixed, it will be computed by
12352 finish_enum and we will reset the type of this enumerator. Of
12353 course, if we're processing a template, there may be no value. */
12354 type = value ? TREE_TYPE (value) : NULL_TREE;
12356 if (context && context == current_class_type)
12357 /* This enum declaration is local to the class. We need the full
12358 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12359 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12361 /* It's a global enum, or it's local to a function. (Note local to
12362 a function could mean local to a class method. */
12363 decl = build_decl (loc, CONST_DECL, name, type);
12365 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12366 TREE_CONSTANT (decl) = 1;
12367 TREE_READONLY (decl) = 1;
12368 DECL_INITIAL (decl) = value;
12370 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12371 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12372 on the TYPE_FIELDS list for `S'. (That's so that you can say
12373 things like `S::i' later.) */
12374 finish_member_declaration (decl);
12378 /* Add this enumeration constant to the list for this type. */
12379 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12382 /* Look for an enumerator with the given NAME within the enumeration
12383 type ENUMTYPE. This routine is used primarily for qualified name
12384 lookup into an enumerator in C++0x, e.g.,
12386 enum class Color { Red, Green, Blue };
12388 Color color = Color::Red;
12390 Returns the value corresponding to the enumerator, or
12391 NULL_TREE if no such enumerator was found. */
12393 lookup_enumerator (tree enumtype, tree name)
12396 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12398 e = purpose_member (name, TYPE_VALUES (enumtype));
12399 return e? TREE_VALUE (e) : NULL_TREE;
12403 /* We're defining DECL. Make sure that its type is OK. */
12406 check_function_type (tree decl, tree current_function_parms)
12408 tree fntype = TREE_TYPE (decl);
12409 tree return_type = complete_type (TREE_TYPE (fntype));
12411 /* In a function definition, arg types must be complete. */
12412 require_complete_types_for_parms (current_function_parms);
12414 if (dependent_type_p (return_type))
12416 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12417 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12419 tree args = TYPE_ARG_TYPES (fntype);
12421 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12422 error ("return type %q#T is incomplete", return_type);
12424 error ("return type has Java class type %q#T", return_type);
12426 /* Make it return void instead. */
12427 if (TREE_CODE (fntype) == METHOD_TYPE)
12428 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12430 TREE_CHAIN (args));
12432 fntype = build_function_type (void_type_node, args);
12434 = build_exception_variant (fntype,
12435 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12436 fntype = (cp_build_type_attribute_variant
12437 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12438 TREE_TYPE (decl) = fntype;
12441 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12444 /* Create the FUNCTION_DECL for a function definition.
12445 DECLSPECS and DECLARATOR are the parts of the declaration;
12446 they describe the function's name and the type it returns,
12447 but twisted together in a fashion that parallels the syntax of C.
12449 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12450 DECLARATOR is really the DECL for the function we are about to
12451 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12452 indicating that the function is an inline defined in-class.
12454 This function creates a binding context for the function body
12455 as well as setting up the FUNCTION_DECL in current_function_decl.
12457 For C++, we must first check whether that datum makes any sense.
12458 For example, "class A local_a(1,2);" means that variable local_a
12459 is an aggregate of type A, which should have a constructor
12460 applied to it with the argument list [1, 2].
12462 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12463 or may be a BLOCK if the function has been defined previously
12464 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12465 error_mark_node if the function has never been defined, or
12466 a BLOCK if the function has been defined somewhere. */
12469 start_preparsed_function (tree decl1, tree attrs, int flags)
12471 tree ctype = NULL_TREE;
12474 int doing_friend = 0;
12475 cp_binding_level *bl;
12476 tree current_function_parms;
12477 struct c_fileinfo *finfo
12478 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12479 bool honor_interface;
12481 /* Sanity check. */
12482 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12483 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12485 fntype = TREE_TYPE (decl1);
12486 if (TREE_CODE (fntype) == METHOD_TYPE)
12487 ctype = TYPE_METHOD_BASETYPE (fntype);
12489 /* ISO C++ 11.4/5. A friend function defined in a class is in
12490 the (lexical) scope of the class in which it is defined. */
12491 if (!ctype && DECL_FRIEND_P (decl1))
12493 ctype = DECL_FRIEND_CONTEXT (decl1);
12495 /* CTYPE could be null here if we're dealing with a template;
12496 for example, `inline friend float foo()' inside a template
12497 will have no CTYPE set. */
12498 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12504 if (DECL_DECLARED_INLINE_P (decl1)
12505 && lookup_attribute ("noinline", attrs))
12506 warning (0, "inline function %q+D given attribute noinline", decl1);
12508 /* Handle gnu_inline attribute. */
12509 if (GNU_INLINE_P (decl1))
12511 DECL_EXTERNAL (decl1) = 1;
12512 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12513 DECL_INTERFACE_KNOWN (decl1) = 1;
12514 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12517 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12518 /* This is a constructor, we must ensure that any default args
12519 introduced by this definition are propagated to the clones
12520 now. The clones are used directly in overload resolution. */
12521 adjust_clone_args (decl1);
12523 /* Sometimes we don't notice that a function is a static member, and
12524 build a METHOD_TYPE for it. Fix that up now. */
12525 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12526 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12528 /* Set up current_class_type, and enter the scope of the class, if
12531 push_nested_class (ctype);
12532 else if (DECL_STATIC_FUNCTION_P (decl1))
12533 push_nested_class (DECL_CONTEXT (decl1));
12535 /* Now that we have entered the scope of the class, we must restore
12536 the bindings for any template parameters surrounding DECL1, if it
12537 is an inline member template. (Order is important; consider the
12538 case where a template parameter has the same name as a field of
12539 the class.) It is not until after this point that
12540 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12541 if (flags & SF_INCLASS_INLINE)
12542 maybe_begin_member_template_processing (decl1);
12544 /* Effective C++ rule 15. */
12546 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12547 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12548 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12550 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12551 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12552 if (!DECL_INITIAL (decl1))
12553 DECL_INITIAL (decl1) = error_mark_node;
12555 /* This function exists in static storage.
12556 (This does not mean `static' in the C sense!) */
12557 TREE_STATIC (decl1) = 1;
12559 /* We must call push_template_decl after current_class_type is set
12560 up. (If we are processing inline definitions after exiting a
12561 class scope, current_class_type will be NULL_TREE until set above
12562 by push_nested_class.) */
12563 if (processing_template_decl)
12565 /* FIXME: Handle error_mark_node more gracefully. */
12566 tree newdecl1 = push_template_decl (decl1);
12567 if (newdecl1 != error_mark_node)
12571 /* We are now in the scope of the function being defined. */
12572 current_function_decl = decl1;
12574 /* Save the parm names or decls from this function's declarator
12575 where store_parm_decls will find them. */
12576 current_function_parms = DECL_ARGUMENTS (decl1);
12578 /* Make sure the parameter and return types are reasonable. When
12579 you declare a function, these types can be incomplete, but they
12580 must be complete when you define the function. */
12581 check_function_type (decl1, current_function_parms);
12583 /* Build the return declaration for the function. */
12584 restype = TREE_TYPE (fntype);
12585 if (DECL_RESULT (decl1) == NULL_TREE)
12589 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12590 DECL_ARTIFICIAL (resdecl) = 1;
12591 DECL_IGNORED_P (resdecl) = 1;
12592 DECL_RESULT (decl1) = resdecl;
12594 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12597 /* Let the user know we're compiling this function. */
12598 announce_function (decl1);
12600 /* Record the decl so that the function name is defined.
12601 If we already have a decl for this name, and it is a FUNCTION_DECL,
12602 use the old decl. */
12603 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12605 /* A specialization is not used to guide overload resolution. */
12606 if (!DECL_FUNCTION_MEMBER_P (decl1)
12607 && !(DECL_USE_TEMPLATE (decl1) &&
12608 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12610 tree olddecl = pushdecl (decl1);
12612 if (olddecl == error_mark_node)
12613 /* If something went wrong when registering the declaration,
12614 use DECL1; we have to have a FUNCTION_DECL to use when
12615 parsing the body of the function. */
12619 /* Otherwise, OLDDECL is either a previous declaration
12620 of the same function or DECL1 itself. */
12622 if (warn_missing_declarations
12623 && olddecl == decl1
12624 && !DECL_MAIN_P (decl1)
12625 && TREE_PUBLIC (decl1)
12626 && !DECL_DECLARED_INLINE_P (decl1))
12630 /* Check whether DECL1 is in an anonymous
12632 for (context = DECL_CONTEXT (decl1);
12634 context = DECL_CONTEXT (context))
12636 if (TREE_CODE (context) == NAMESPACE_DECL
12637 && DECL_NAME (context) == NULL_TREE)
12641 if (context == NULL)
12642 warning (OPT_Wmissing_declarations,
12643 "no previous declaration for %q+D", decl1);
12651 /* We need to set the DECL_CONTEXT. */
12652 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12653 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12655 fntype = TREE_TYPE (decl1);
12657 /* If #pragma weak applies, mark the decl appropriately now.
12658 The pragma only applies to global functions. Because
12659 determining whether or not the #pragma applies involves
12660 computing the mangled name for the declaration, we cannot
12661 apply the pragma until after we have merged this declaration
12662 with any previous declarations; if the original declaration
12663 has a linkage specification, that specification applies to
12664 the definition as well, and may affect the mangled name. */
12665 if (DECL_FILE_SCOPE_P (decl1))
12666 maybe_apply_pragma_weak (decl1);
12669 /* Reset this in case the call to pushdecl changed it. */
12670 current_function_decl = decl1;
12672 gcc_assert (DECL_INITIAL (decl1));
12674 /* This function may already have been parsed, in which case just
12675 return; our caller will skip over the body without parsing. */
12676 if (DECL_INITIAL (decl1) != error_mark_node)
12679 /* Initialize RTL machinery. We cannot do this until
12680 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12681 even when processing a template; this is how we get
12682 CFUN set up, and our per-function variables initialized.
12683 FIXME factor out the non-RTL stuff. */
12684 bl = current_binding_level;
12685 allocate_struct_function (decl1, processing_template_decl);
12687 /* Initialize the language data structures. Whenever we start
12688 a new function, we destroy temporaries in the usual way. */
12689 cfun->language = ggc_alloc_cleared_language_function ();
12690 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12691 current_binding_level = bl;
12693 /* Start the statement-tree, start the tree now. */
12694 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12696 /* If we are (erroneously) defining a function that we have already
12697 defined before, wipe out what we knew before. */
12698 if (!DECL_PENDING_INLINE_P (decl1))
12699 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12701 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12703 /* We know that this was set up by `grokclassfn'. We do not
12704 wait until `store_parm_decls', since evil parse errors may
12705 never get us to that point. Here we keep the consistency
12706 between `current_class_type' and `current_class_ptr'. */
12707 tree t = DECL_ARGUMENTS (decl1);
12709 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12710 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12712 cp_function_chain->x_current_class_ref
12713 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12714 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12715 cp_function_chain->x_current_class_ptr = t;
12717 /* Constructors and destructors need to know whether they're "in
12718 charge" of initializing virtual base classes. */
12719 t = DECL_CHAIN (t);
12720 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12722 current_in_charge_parm = t;
12723 t = DECL_CHAIN (t);
12725 if (DECL_HAS_VTT_PARM_P (decl1))
12727 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12728 current_vtt_parm = t;
12732 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12733 /* Implicitly-defined methods (like the
12734 destructor for a class in which no destructor
12735 is explicitly declared) must not be defined
12736 until their definition is needed. So, we
12737 ignore interface specifications for
12738 compiler-generated functions. */
12739 && !DECL_ARTIFICIAL (decl1));
12741 if (processing_template_decl)
12742 /* Don't mess with interface flags. */;
12743 else if (DECL_INTERFACE_KNOWN (decl1))
12745 tree ctx = decl_function_context (decl1);
12747 if (DECL_NOT_REALLY_EXTERN (decl1))
12748 DECL_EXTERNAL (decl1) = 0;
12750 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12751 && TREE_PUBLIC (ctx))
12752 /* This is a function in a local class in an extern inline
12754 comdat_linkage (decl1);
12756 /* If this function belongs to an interface, it is public.
12757 If it belongs to someone else's interface, it is also external.
12758 This only affects inlines and template instantiations. */
12759 else if (!finfo->interface_unknown && honor_interface)
12761 if (DECL_DECLARED_INLINE_P (decl1)
12762 || DECL_TEMPLATE_INSTANTIATION (decl1))
12764 DECL_EXTERNAL (decl1)
12765 = (finfo->interface_only
12766 || (DECL_DECLARED_INLINE_P (decl1)
12767 && ! flag_implement_inlines
12768 && !DECL_VINDEX (decl1)));
12770 /* For WIN32 we also want to put these in linkonce sections. */
12771 maybe_make_one_only (decl1);
12774 DECL_EXTERNAL (decl1) = 0;
12775 DECL_INTERFACE_KNOWN (decl1) = 1;
12776 /* If this function is in an interface implemented in this file,
12777 make sure that the back end knows to emit this function
12779 if (!DECL_EXTERNAL (decl1))
12780 mark_needed (decl1);
12782 else if (finfo->interface_unknown && finfo->interface_only
12783 && honor_interface)
12785 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12786 interface, we will have both finfo->interface_unknown and
12787 finfo->interface_only set. In that case, we don't want to
12788 use the normal heuristics because someone will supply a
12789 #pragma implementation elsewhere, and deducing it here would
12790 produce a conflict. */
12791 comdat_linkage (decl1);
12792 DECL_EXTERNAL (decl1) = 0;
12793 DECL_INTERFACE_KNOWN (decl1) = 1;
12794 DECL_DEFER_OUTPUT (decl1) = 1;
12798 /* This is a definition, not a reference.
12799 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12800 if (!GNU_INLINE_P (decl1))
12801 DECL_EXTERNAL (decl1) = 0;
12803 if ((DECL_DECLARED_INLINE_P (decl1)
12804 || DECL_TEMPLATE_INSTANTIATION (decl1))
12805 && ! DECL_INTERFACE_KNOWN (decl1))
12806 DECL_DEFER_OUTPUT (decl1) = 1;
12808 DECL_INTERFACE_KNOWN (decl1) = 1;
12811 /* Determine the ELF visibility attribute for the function. We must not
12812 do this before calling "pushdecl", as we must allow "duplicate_decls"
12813 to merge any attributes appropriately. We also need to wait until
12815 if (!DECL_CLONED_FUNCTION_P (decl1))
12816 determine_visibility (decl1);
12818 begin_scope (sk_function_parms, decl1);
12822 if (DECL_DESTRUCTOR_P (decl1)
12823 || (DECL_CONSTRUCTOR_P (decl1)
12824 && targetm.cxx.cdtor_returns_this ()))
12826 cdtor_label = build_decl (input_location,
12827 LABEL_DECL, NULL_TREE, NULL_TREE);
12828 DECL_CONTEXT (cdtor_label) = current_function_decl;
12831 start_fname_decls ();
12833 store_parm_decls (current_function_parms);
12837 /* Like start_preparsed_function, except that instead of a
12838 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12840 Returns 1 on success. If the DECLARATOR is not suitable for a function
12841 (it defines a datum instead), we return 0, which tells
12842 yyparse to report a parse error. */
12845 start_function (cp_decl_specifier_seq *declspecs,
12846 const cp_declarator *declarator,
12851 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12852 if (decl1 == error_mark_node)
12854 /* If the declarator is not suitable for a function definition,
12855 cause a syntax error. */
12856 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12858 error ("invalid function declaration");
12862 if (DECL_MAIN_P (decl1))
12863 /* main must return int. grokfndecl should have corrected it
12864 (and issued a diagnostic) if the user got it wrong. */
12865 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12866 integer_type_node));
12868 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12873 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12877 use_eh_spec_block (tree fn)
12879 return (flag_exceptions && flag_enforce_eh_specs
12880 && !processing_template_decl
12881 && !type_throw_all_p (TREE_TYPE (fn))
12882 /* We insert the EH_SPEC_BLOCK only in the original
12883 function; then, it is copied automatically to the
12885 && !DECL_CLONED_FUNCTION_P (fn)
12886 /* Implicitly-generated constructors and destructors have
12887 exception specifications. However, those specifications
12888 are the union of the possible exceptions specified by the
12889 constructors/destructors for bases and members, so no
12890 unallowed exception will ever reach this function. By
12891 not creating the EH_SPEC_BLOCK we save a little memory,
12892 and we avoid spurious warnings about unreachable
12894 && !DECL_DEFAULTED_FN (fn));
12897 /* Store the parameter declarations into the current function declaration.
12898 This is called after parsing the parameter declarations, before
12899 digesting the body of the function.
12901 Also install to binding contour return value identifier, if any. */
12904 store_parm_decls (tree current_function_parms)
12906 tree fndecl = current_function_decl;
12909 /* This is a chain of any other decls that came in among the parm
12910 declarations. If a parm is declared with enum {foo, bar} x;
12911 then CONST_DECLs for foo and bar are put here. */
12912 tree nonparms = NULL_TREE;
12914 if (current_function_parms)
12916 /* This case is when the function was defined with an ANSI prototype.
12917 The parms already have decls, so we need not do anything here
12918 except record them as in effect
12919 and complain if any redundant old-style parm decls were written. */
12921 tree specparms = current_function_parms;
12924 /* Must clear this because it might contain TYPE_DECLs declared
12926 current_binding_level->names = NULL;
12928 /* If we're doing semantic analysis, then we'll call pushdecl
12929 for each of these. We must do them in reverse order so that
12930 they end in the correct forward order. */
12931 specparms = nreverse (specparms);
12933 for (parm = specparms; parm; parm = next)
12935 next = DECL_CHAIN (parm);
12936 if (TREE_CODE (parm) == PARM_DECL)
12938 if (DECL_NAME (parm) == NULL_TREE
12939 || TREE_CODE (parm) != VOID_TYPE)
12942 error ("parameter %qD declared void", parm);
12946 /* If we find an enum constant or a type tag,
12947 put it aside for the moment. */
12948 TREE_CHAIN (parm) = NULL_TREE;
12949 nonparms = chainon (nonparms, parm);
12953 /* Get the decls in their original chain order and record in the
12954 function. This is all and only the PARM_DECLs that were
12955 pushed into scope by the loop above. */
12956 DECL_ARGUMENTS (fndecl) = getdecls ();
12959 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12961 /* Now store the final chain of decls for the arguments
12962 as the decl-chain of the current lexical scope.
12963 Put the enumerators in as well, at the front so that
12964 DECL_ARGUMENTS is not modified. */
12965 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12967 if (use_eh_spec_block (current_function_decl))
12968 current_eh_spec_block = begin_eh_spec_block ();
12972 /* We have finished doing semantic analysis on DECL, but have not yet
12973 generated RTL for its body. Save away our current state, so that
12974 when we want to generate RTL later we know what to do. */
12977 save_function_data (tree decl)
12979 struct language_function *f;
12981 /* Save the language-specific per-function data so that we can
12982 get it back when we really expand this function. */
12983 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12986 f = ggc_alloc_language_function ();
12987 memcpy (f, cp_function_chain, sizeof (struct language_function));
12988 DECL_SAVED_FUNCTION_DATA (decl) = f;
12990 /* Clear out the bits we don't need. */
12991 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
12992 f->bindings = NULL;
12993 f->x_local_names = NULL;
12997 /* Set the return value of the constructor (if present). */
13000 finish_constructor_body (void)
13005 if (targetm.cxx.cdtor_returns_this ()
13006 && (! TYPE_FOR_JAVA (current_class_type)))
13008 /* Any return from a constructor will end up here. */
13009 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13011 val = DECL_ARGUMENTS (current_function_decl);
13012 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13013 DECL_RESULT (current_function_decl), val);
13014 /* Return the address of the object. */
13015 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13016 add_stmt (exprstmt);
13020 /* Do all the processing for the beginning of a destructor; set up the
13021 vtable pointers and cleanups for bases and members. */
13024 begin_destructor_body (void)
13026 tree compound_stmt;
13028 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13029 issued an error message. We still want to try to process the
13030 body of the function, but initialize_vtbl_ptrs will crash if
13031 TYPE_BINFO is NULL. */
13032 if (COMPLETE_TYPE_P (current_class_type))
13034 compound_stmt = begin_compound_stmt (0);
13035 /* Make all virtual function table pointers in non-virtual base
13036 classes point to CURRENT_CLASS_TYPE's virtual function
13038 initialize_vtbl_ptrs (current_class_ptr);
13039 finish_compound_stmt (compound_stmt);
13041 /* And insert cleanups for our bases and members so that they
13042 will be properly destroyed if we throw. */
13043 push_base_cleanups ();
13047 /* At the end of every destructor we generate code to delete the object if
13048 necessary. Do that now. */
13051 finish_destructor_body (void)
13055 /* Any return from a destructor will end up here; that way all base
13056 and member cleanups will be run when the function returns. */
13057 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13059 /* In a virtual destructor, we must call delete. */
13060 if (DECL_VIRTUAL_P (current_function_decl))
13063 tree virtual_size = cxx_sizeof (current_class_type);
13067 At the point of definition of a virtual destructor (including
13068 an implicit definition), non-placement operator delete shall
13069 be looked up in the scope of the destructor's class and if
13070 found shall be accessible and unambiguous. */
13071 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13073 /*global_p=*/false,
13074 /*placement=*/NULL_TREE,
13075 /*alloc_fn=*/NULL_TREE);
13077 if_stmt = begin_if_stmt ();
13078 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13079 current_in_charge_parm,
13082 finish_expr_stmt (exprstmt);
13083 finish_then_clause (if_stmt);
13084 finish_if_stmt (if_stmt);
13087 if (targetm.cxx.cdtor_returns_this ())
13091 val = DECL_ARGUMENTS (current_function_decl);
13092 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13093 DECL_RESULT (current_function_decl), val);
13094 /* Return the address of the object. */
13095 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13096 add_stmt (exprstmt);
13100 /* Do the necessary processing for the beginning of a function body, which
13101 in this case includes member-initializers, but not the catch clauses of
13102 a function-try-block. Currently, this means opening a binding level
13103 for the member-initializers (in a ctor), member cleanups (in a dtor),
13104 and capture proxies (in a lambda operator()). */
13107 begin_function_body (void)
13111 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13114 if (processing_template_decl)
13115 /* Do nothing now. */;
13117 /* Always keep the BLOCK node associated with the outermost pair of
13118 curly braces of a function. These are needed for correct
13119 operation of dwarfout.c. */
13120 keep_next_level (true);
13122 stmt = begin_compound_stmt (BCS_FN_BODY);
13124 if (processing_template_decl)
13125 /* Do nothing now. */;
13126 else if (DECL_DESTRUCTOR_P (current_function_decl))
13127 begin_destructor_body ();
13132 /* Do the processing for the end of a function body. Currently, this means
13133 closing out the cleanups for fully-constructed bases and members, and in
13134 the case of the destructor, deleting the object if desired. Again, this
13135 is only meaningful for [cd]tors, since they are the only functions where
13136 there is a significant distinction between the main body and any
13137 function catch clauses. Handling, say, main() return semantics here
13138 would be wrong, as flowing off the end of a function catch clause for
13139 main() would also need to return 0. */
13142 finish_function_body (tree compstmt)
13144 if (compstmt == NULL_TREE)
13147 /* Close the block. */
13148 finish_compound_stmt (compstmt);
13150 if (processing_template_decl)
13151 /* Do nothing now. */;
13152 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13153 finish_constructor_body ();
13154 else if (DECL_DESTRUCTOR_P (current_function_decl))
13155 finish_destructor_body ();
13158 /* Given a function, returns the BLOCK corresponding to the outermost level
13159 of curly braces, skipping the artificial block created for constructor
13163 outer_curly_brace_block (tree fndecl)
13165 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13166 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13167 /* Skip the artificial function body block. */
13168 block = BLOCK_SUBBLOCKS (block);
13172 /* If FNDECL is a class's key method, add the class to the list of
13173 keyed classes that should be emitted. */
13176 record_key_method_defined (tree fndecl)
13178 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13179 && DECL_VIRTUAL_P (fndecl)
13180 && !processing_template_decl)
13182 tree fnclass = DECL_CONTEXT (fndecl);
13183 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13184 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13188 /* Subroutine of finish_function.
13189 Save the body of constexpr functions for possible
13190 future compile time evaluation. */
13193 maybe_save_function_definition (tree fun)
13195 if (!processing_template_decl
13196 && DECL_DECLARED_CONSTEXPR_P (fun)
13197 && !DECL_CLONED_FUNCTION_P (fun))
13198 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13201 /* Finish up a function declaration and compile that function
13202 all the way to assembler language output. The free the storage
13203 for the function definition.
13205 FLAGS is a bitwise or of the following values:
13207 We just finished processing the body of an in-class inline
13208 function definition. (This processing will have taken place
13209 after the class definition is complete.) */
13212 finish_function (int flags)
13214 tree fndecl = current_function_decl;
13215 tree fntype, ctype = NULL_TREE;
13216 int inclass_inline = (flags & 2) != 0;
13218 /* When we get some parse errors, we can end up without a
13219 current_function_decl, so cope. */
13220 if (fndecl == NULL_TREE)
13221 return error_mark_node;
13223 if (c_dialect_objc ())
13224 objc_finish_function ();
13226 gcc_assert (!defer_mark_used_calls);
13227 defer_mark_used_calls = true;
13229 record_key_method_defined (fndecl);
13231 fntype = TREE_TYPE (fndecl);
13233 /* TREE_READONLY (fndecl) = 1;
13234 This caused &foo to be of type ptr-to-const-function
13235 which then got a warning when stored in a ptr-to-function variable. */
13237 gcc_assert (building_stmt_list_p ());
13238 /* The current function is being defined, so its DECL_INITIAL should
13239 be set, and unless there's a multiple definition, it should be
13240 error_mark_node. */
13241 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13243 /* For a cloned function, we've already got all the code we need;
13244 there's no need to add any extra bits. */
13245 if (!DECL_CLONED_FUNCTION_P (fndecl))
13247 if (DECL_MAIN_P (current_function_decl))
13249 /* Make it so that `main' always returns 0 by default (or
13252 finish_return_stmt (integer_one_node);
13254 finish_return_stmt (integer_zero_node);
13258 if (use_eh_spec_block (current_function_decl))
13259 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13260 (TREE_TYPE (current_function_decl)),
13261 current_eh_spec_block);
13264 /* If we're saving up tree structure, tie off the function now. */
13265 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13267 finish_fname_decls ();
13269 /* If this function can't throw any exceptions, remember that. */
13270 if (!processing_template_decl
13271 && !cp_function_chain->can_throw
13272 && !flag_non_call_exceptions
13273 && !decl_replaceable_p (fndecl))
13274 TREE_NOTHROW (fndecl) = 1;
13276 /* This must come after expand_function_end because cleanups might
13277 have declarations (from inline functions) that need to go into
13278 this function's blocks. */
13280 /* If the current binding level isn't the outermost binding level
13281 for this function, either there is a bug, or we have experienced
13282 syntax errors and the statement tree is malformed. */
13283 if (current_binding_level->kind != sk_function_parms)
13285 /* Make sure we have already experienced errors. */
13286 gcc_assert (errorcount);
13288 /* Throw away the broken statement tree and extra binding
13290 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13292 while (current_binding_level->kind != sk_function_parms)
13294 if (current_binding_level->kind == sk_class)
13295 pop_nested_class ();
13297 poplevel (0, 0, 0);
13300 poplevel (1, 0, 1);
13302 /* Statements should always be full-expressions at the outermost set
13303 of curly braces for a function. */
13304 gcc_assert (stmts_are_full_exprs_p ());
13306 /* Save constexpr function body before it gets munged by
13307 the NRV transformation. */
13308 maybe_save_function_definition (fndecl);
13310 /* Set up the named return value optimization, if we can. Candidate
13311 variables are selected in check_return_expr. */
13312 if (current_function_return_value)
13314 tree r = current_function_return_value;
13317 if (r != error_mark_node
13318 /* This is only worth doing for fns that return in memory--and
13319 simpler, since we don't have to worry about promoted modes. */
13320 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13321 /* Only allow this for variables declared in the outer scope of
13322 the function so we know that their lifetime always ends with a
13323 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13324 we were to do this optimization in tree-ssa. */
13325 && (outer = outer_curly_brace_block (fndecl))
13326 && chain_member (r, BLOCK_VARS (outer)))
13327 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13329 current_function_return_value = NULL_TREE;
13332 /* Remember that we were in class scope. */
13333 if (current_class_name)
13334 ctype = current_class_type;
13336 /* Must mark the RESULT_DECL as being in this function. */
13337 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13339 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13340 to the FUNCTION_DECL node itself. */
13341 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13343 /* Save away current state, if appropriate. */
13344 if (!processing_template_decl)
13345 save_function_data (fndecl);
13347 /* Complain if there's just no return statement. */
13348 if (warn_return_type
13349 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13350 && !dependent_type_p (TREE_TYPE (fntype))
13351 && !current_function_returns_value && !current_function_returns_null
13352 /* Don't complain if we abort or throw. */
13353 && !current_function_returns_abnormally
13354 /* Don't complain if we are declared noreturn. */
13355 && !TREE_THIS_VOLATILE (fndecl)
13356 && !DECL_NAME (DECL_RESULT (fndecl))
13357 && !TREE_NO_WARNING (fndecl)
13358 /* Structor return values (if any) are set by the compiler. */
13359 && !DECL_CONSTRUCTOR_P (fndecl)
13360 && !DECL_DESTRUCTOR_P (fndecl))
13362 warning (OPT_Wreturn_type,
13363 "no return statement in function returning non-void");
13364 TREE_NO_WARNING (fndecl) = 1;
13367 /* Store the end of the function, so that we get good line number
13368 info for the epilogue. */
13369 cfun->function_end_locus = input_location;
13371 /* Complain about parameters that are only set, but never otherwise used. */
13372 if (warn_unused_but_set_parameter
13373 && !processing_template_decl
13374 && errorcount == unused_but_set_errorcount
13375 && !DECL_CLONED_FUNCTION_P (fndecl))
13379 for (decl = DECL_ARGUMENTS (fndecl);
13381 decl = DECL_CHAIN (decl))
13382 if (TREE_USED (decl)
13383 && TREE_CODE (decl) == PARM_DECL
13384 && !DECL_READ_P (decl)
13385 && DECL_NAME (decl)
13386 && !DECL_ARTIFICIAL (decl)
13387 && !TREE_NO_WARNING (decl)
13388 && !DECL_IN_SYSTEM_HEADER (decl)
13389 && TREE_TYPE (decl) != error_mark_node
13390 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13391 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13392 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13393 warning (OPT_Wunused_but_set_parameter,
13394 "parameter %q+D set but not used", decl);
13395 unused_but_set_errorcount = errorcount;
13398 /* Complain about locally defined typedefs that are not used in this
13400 maybe_warn_unused_local_typedefs ();
13402 /* Genericize before inlining. */
13403 if (!processing_template_decl)
13405 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13406 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13407 cp_genericize (fndecl);
13408 /* Clear out the bits we don't need. */
13409 f->x_current_class_ptr = NULL;
13410 f->x_current_class_ref = NULL;
13411 f->x_eh_spec_block = NULL;
13412 f->x_in_charge_parm = NULL;
13413 f->x_vtt_parm = NULL;
13414 f->x_return_value = NULL;
13415 f->bindings = NULL;
13416 f->extern_decl_map = NULL;
13418 /* Clear out the bits we don't need. */
13419 local_names = NULL;
13421 /* We're leaving the context of this function, so zap cfun. It's still in
13422 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13424 current_function_decl = NULL;
13426 /* If this is an in-class inline definition, we may have to pop the
13427 bindings for the template parameters that we added in
13428 maybe_begin_member_template_processing when start_function was
13430 if (inclass_inline)
13431 maybe_end_member_template_processing ();
13433 /* Leave the scope of the class. */
13435 pop_nested_class ();
13440 current_function_decl = NULL_TREE;
13442 defer_mark_used_calls = false;
13443 if (deferred_mark_used_calls)
13448 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13450 VEC_free (tree, gc, deferred_mark_used_calls);
13456 /* Create the FUNCTION_DECL for a function definition.
13457 DECLSPECS and DECLARATOR are the parts of the declaration;
13458 they describe the return type and the name of the function,
13459 but twisted together in a fashion that parallels the syntax of C.
13461 This function creates a binding context for the function body
13462 as well as setting up the FUNCTION_DECL in current_function_decl.
13464 Returns a FUNCTION_DECL on success.
13466 If the DECLARATOR is not suitable for a function (it defines a datum
13467 instead), we return 0, which tells yyparse to report a parse error.
13469 May return void_type_node indicating that this method is actually
13470 a friend. See grokfield for more details.
13472 Came here with a `.pushlevel' .
13474 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13475 CHANGES TO CODE IN `grokfield'. */
13478 grokmethod (cp_decl_specifier_seq *declspecs,
13479 const cp_declarator *declarator, tree attrlist)
13481 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13484 if (fndecl == error_mark_node)
13485 return error_mark_node;
13487 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13489 error ("invalid member function declaration");
13490 return error_mark_node;
13494 cplus_decl_attributes (&fndecl, attrlist, 0);
13496 /* Pass friends other than inline friend functions back. */
13497 if (fndecl == void_type_node)
13500 if (DECL_IN_AGGR_P (fndecl))
13502 if (DECL_CLASS_SCOPE_P (fndecl))
13503 error ("%qD is already defined in class %qT", fndecl,
13504 DECL_CONTEXT (fndecl));
13505 return error_mark_node;
13508 check_template_shadow (fndecl);
13510 DECL_DECLARED_INLINE_P (fndecl) = 1;
13511 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13513 /* We process method specializations in finish_struct_1. */
13514 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13516 fndecl = push_template_decl (fndecl);
13517 if (fndecl == error_mark_node)
13521 if (! DECL_FRIEND_P (fndecl))
13523 if (DECL_CHAIN (fndecl))
13525 fndecl = copy_node (fndecl);
13526 TREE_CHAIN (fndecl) = NULL_TREE;
13530 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13532 DECL_IN_AGGR_P (fndecl) = 1;
13537 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13538 we can lay it out later, when and if its type becomes complete. */
13541 maybe_register_incomplete_var (tree var)
13543 gcc_assert (TREE_CODE (var) == VAR_DECL);
13545 /* Keep track of variables with incomplete types. */
13546 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13547 && DECL_EXTERNAL (var))
13549 tree inner_type = TREE_TYPE (var);
13551 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13552 inner_type = TREE_TYPE (inner_type);
13553 inner_type = TYPE_MAIN_VARIANT (inner_type);
13555 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13556 /* RTTI TD entries are created while defining the type_info. */
13557 || (TYPE_LANG_SPECIFIC (inner_type)
13558 && TYPE_BEING_DEFINED (inner_type)))
13561 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13563 iv->incomplete_type = inner_type;
13568 /* Called when a class type (given by TYPE) is defined. If there are
13569 any existing VAR_DECLs whose type has been completed by this
13570 declaration, update them now. */
13573 complete_vars (tree type)
13576 incomplete_var *iv;
13578 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13580 if (same_type_p (type, iv->incomplete_type))
13582 tree var = iv->decl;
13583 tree type = TREE_TYPE (var);
13584 /* Complete the type of the variable. The VAR_DECL itself
13585 will be laid out in expand_expr. */
13586 complete_type (type);
13587 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13588 /* Remove this entry from the list. */
13589 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13595 /* Check for pending declarations which may have abstract type. */
13596 complete_type_check_abstract (type);
13599 /* If DECL is of a type which needs a cleanup, build and return an
13600 expression to perform that cleanup here. Return NULL_TREE if no
13601 cleanup need be done. */
13604 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13610 /* Assume no cleanup is required. */
13611 cleanup = NULL_TREE;
13613 if (error_operand_p (decl))
13616 /* Handle "__attribute__((cleanup))". We run the cleanup function
13617 before the destructor since the destructor is what actually
13618 terminates the lifetime of the object. */
13619 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13626 /* Get the name specified by the user for the cleanup function. */
13627 id = TREE_VALUE (TREE_VALUE (attr));
13628 /* Look up the name to find the cleanup function to call. It is
13629 important to use lookup_name here because that is what is
13630 used in c-common.c:handle_cleanup_attribute when performing
13631 initial checks on the attribute. Note that those checks
13632 include ensuring that the function found is not an overloaded
13633 function, or an object with an overloaded call operator,
13634 etc.; we can rely on the fact that the function found is an
13635 ordinary FUNCTION_DECL. */
13636 fn = lookup_name (id);
13637 arg = build_address (decl);
13639 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13640 if (cleanup == error_mark_node)
13641 return error_mark_node;
13643 /* Handle ordinary C++ destructors. */
13644 type = TREE_TYPE (decl);
13645 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13647 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13648 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13649 && CLASSTYPE_VBASECLASSES (type));
13653 if (TREE_CODE (type) == ARRAY_TYPE)
13656 addr = build_address (decl);
13658 /* Optimize for space over speed here. */
13659 if (!has_vbases || flag_expensive_optimizations)
13660 flags |= LOOKUP_NONVIRTUAL;
13662 call = build_delete (TREE_TYPE (addr), addr,
13663 sfk_complete_destructor, flags, 0, complain);
13664 if (call == error_mark_node)
13665 cleanup = error_mark_node;
13667 cleanup = cp_build_compound_expr (cleanup, call, complain);
13675 /* When a stmt has been parsed, this function is called. */
13682 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13683 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13684 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13687 static_fn_type (tree memfntype)
13692 if (TYPE_PTRMEMFUNC_P (memfntype))
13693 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13694 if (POINTER_TYPE_P (memfntype)
13695 || TREE_CODE (memfntype) == FUNCTION_DECL)
13696 memfntype = TREE_TYPE (memfntype);
13697 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13699 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13700 args = TYPE_ARG_TYPES (memfntype);
13701 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13702 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13703 fntype = (cp_build_type_attribute_variant
13704 (fntype, TYPE_ATTRIBUTES (memfntype)));
13705 fntype = (build_exception_variant
13706 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13710 /* DECL was originally constructed as a non-static member function,
13711 but turned out to be static. Update it accordingly. */
13714 revert_static_member_fn (tree decl)
13716 tree stype = static_fn_type (decl);
13717 cp_cv_quals quals = type_memfn_quals (stype);
13719 if (quals != TYPE_UNQUALIFIED)
13720 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13722 TREE_TYPE (decl) = stype;
13724 if (DECL_ARGUMENTS (decl))
13725 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13726 DECL_STATIC_FUNCTION_P (decl) = 1;
13729 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13730 one of the language-independent trees. */
13732 enum cp_tree_node_structure_enum
13733 cp_tree_node_structure (union lang_tree_node * t)
13735 switch (TREE_CODE (&t->generic))
13737 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13738 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13739 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13740 case OVERLOAD: return TS_CP_OVERLOAD;
13741 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13742 case PTRMEM_CST: return TS_CP_PTRMEM;
13743 case BASELINK: return TS_CP_BASELINK;
13744 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13745 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13746 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13747 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13748 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13749 default: return TS_CP_GENERIC;
13753 /* Build the void_list_node (void_type_node having been created). */
13755 build_void_list_node (void)
13757 tree t = build_tree_list (NULL_TREE, void_type_node);
13762 cp_missing_noreturn_ok_p (tree decl)
13764 /* A missing noreturn is ok for the `main' function. */
13765 return DECL_MAIN_P (decl);
13768 /* Return the COMDAT group into which DECL should be placed. */
13771 cxx_comdat_group (tree decl)
13775 /* Virtual tables, construction virtual tables, and virtual table
13776 tables all go in a single COMDAT group, named after the primary
13778 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13779 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13780 /* For all other DECLs, the COMDAT group is the mangled name of the
13781 declaration itself. */
13784 while (DECL_THUNK_P (decl))
13786 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13787 into the same section as the target function. In that case
13788 we must return target's name. */
13789 tree target = THUNK_TARGET (decl);
13790 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13791 && DECL_SECTION_NAME (target) != NULL
13792 && DECL_ONE_ONLY (target))
13797 name = DECL_ASSEMBLER_NAME (decl);
13803 #include "gt-cp-decl.h"