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 *);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, tree *);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (DECL_P (olddecl)
1207 && TREE_CODE (newdecl) == FUNCTION_DECL
1208 && TREE_CODE (olddecl) == FUNCTION_DECL
1209 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1211 if (DECL_DECLARED_INLINE_P (newdecl)
1212 && DECL_UNINLINABLE (newdecl)
1213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1214 /* Already warned elsewhere. */;
1215 else if (DECL_DECLARED_INLINE_P (olddecl)
1216 && DECL_UNINLINABLE (olddecl)
1217 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 /* Already warned. */;
1219 else if (DECL_DECLARED_INLINE_P (newdecl)
1220 && DECL_UNINLINABLE (olddecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1225 warning (OPT_Wattributes, "previous declaration of %q+D "
1226 "with attribute noinline", olddecl);
1228 else if (DECL_DECLARED_INLINE_P (olddecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1232 warning (OPT_Wattributes, "function %q+D redeclared with "
1233 "attribute noinline", newdecl);
1234 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1239 /* Check for redeclaration and other discrepancies. */
1240 if (TREE_CODE (olddecl) == FUNCTION_DECL
1241 && DECL_ARTIFICIAL (olddecl))
1243 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1244 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1246 /* Avoid warnings redeclaring built-ins which have not been
1247 explicitly declared. */
1248 if (DECL_ANTICIPATED (olddecl))
1251 /* If you declare a built-in or predefined function name as static,
1252 the old definition is overridden, but optionally warn this was a
1253 bad choice of name. */
1254 if (! TREE_PUBLIC (newdecl))
1256 warning (OPT_Wshadow,
1257 DECL_BUILT_IN (olddecl)
1258 ? G_("shadowing built-in function %q#D")
1259 : G_("shadowing library function %q#D"), olddecl);
1260 /* Discard the old built-in function. */
1263 /* If the built-in is not ansi, then programs can override
1264 it even globally without an error. */
1265 else if (! DECL_BUILT_IN (olddecl))
1266 warning (0, "library function %q#D redeclared as non-function %q#D",
1270 error ("declaration of %q#D", newdecl);
1271 error ("conflicts with built-in declaration %q#D",
1276 else if (!types_match)
1278 /* Avoid warnings redeclaring built-ins which have not been
1279 explicitly declared. */
1280 if (DECL_ANTICIPATED (olddecl))
1282 /* Deal with fileptr_type_node. FILE type is not known
1283 at the time we create the builtins. */
1286 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1287 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1289 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1292 else if (TREE_VALUE (t2) == fileptr_type_node)
1294 tree t = TREE_VALUE (t1);
1296 if (TREE_CODE (t) == POINTER_TYPE
1297 && TYPE_NAME (TREE_TYPE (t))
1298 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1299 == get_identifier ("FILE")
1300 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1302 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1305 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1306 types_match = decls_match (newdecl, olddecl);
1308 return duplicate_decls (newdecl, olddecl,
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1313 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1316 else if ((DECL_EXTERN_C_P (newdecl)
1317 && DECL_EXTERN_C_P (olddecl))
1318 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1321 /* A near match; override the builtin. */
1323 if (TREE_PUBLIC (newdecl))
1325 warning (0, "new declaration %q#D", newdecl);
1326 warning (0, "ambiguates built-in declaration %q#D",
1330 warning (OPT_Wshadow,
1331 DECL_BUILT_IN (olddecl)
1332 ? G_("shadowing built-in function %q#D")
1333 : G_("shadowing library function %q#D"), olddecl);
1336 /* Discard the old built-in function. */
1339 /* Replace the old RTL to avoid problems with inlining. */
1340 COPY_DECL_RTL (newdecl, olddecl);
1342 /* Even if the types match, prefer the new declarations type for
1343 built-ins which have not been explicitly declared, for
1344 exception lists, etc... */
1345 else if (DECL_IS_BUILTIN (olddecl))
1347 tree type = TREE_TYPE (newdecl);
1348 tree attribs = (*targetm.merge_type_attributes)
1349 (TREE_TYPE (olddecl), type);
1351 type = cp_build_type_attribute_variant (type, attribs);
1352 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1355 /* If a function is explicitly declared "throw ()", propagate that to
1356 the corresponding builtin. */
1357 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1358 && DECL_ANTICIPATED (olddecl)
1359 && TREE_NOTHROW (newdecl)
1360 && !TREE_NOTHROW (olddecl)
1361 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1362 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1364 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1366 /* Whether or not the builtin can throw exceptions has no
1367 bearing on this declarator. */
1368 TREE_NOTHROW (olddecl) = 0;
1370 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1372 /* If a builtin function is redeclared as `static', merge
1373 the declarations, but make the original one static. */
1374 DECL_THIS_STATIC (olddecl) = 1;
1375 TREE_PUBLIC (olddecl) = 0;
1377 /* Make the old declaration consistent with the new one so
1378 that all remnants of the builtin-ness of this function
1379 will be banished. */
1380 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1381 COPY_DECL_RTL (newdecl, olddecl);
1384 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1386 /* C++ Standard, 3.3, clause 4:
1387 "[Note: a namespace name or a class template name must be unique
1388 in its declarative region (7.3.2, clause 14). ]" */
1389 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1390 && TREE_CODE (newdecl) != NAMESPACE_DECL
1391 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1392 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1393 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1394 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1396 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1397 && TREE_CODE (newdecl) != TYPE_DECL)
1398 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1399 && TREE_CODE (olddecl) != TYPE_DECL))
1401 /* We do nothing special here, because C++ does such nasty
1402 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1403 get shadowed, and know that if we need to find a TYPE_DECL
1404 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1405 slot of the identifier. */
1409 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1410 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1411 || (TREE_CODE (olddecl) == FUNCTION_DECL
1412 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1416 error ("%q#D redeclared as different kind of symbol", newdecl);
1417 if (TREE_CODE (olddecl) == TREE_LIST)
1418 olddecl = TREE_VALUE (olddecl);
1419 error ("previous declaration of %q+#D", olddecl);
1421 return error_mark_node;
1423 else if (!types_match)
1425 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1426 /* These are certainly not duplicate declarations; they're
1427 from different scopes. */
1430 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1432 /* The name of a class template may not be declared to refer to
1433 any other template, class, function, object, namespace, value,
1434 or type in the same scope. */
1435 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1436 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1438 error ("declaration of template %q#D", newdecl);
1439 error ("conflicts with previous declaration %q+#D", olddecl);
1441 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1442 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1443 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1444 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1445 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1446 DECL_TEMPLATE_PARMS (olddecl))
1447 /* Template functions can be disambiguated by
1449 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1450 TREE_TYPE (TREE_TYPE (olddecl))))
1452 error ("new declaration %q#D", newdecl);
1453 error ("ambiguates old declaration %q+#D", olddecl);
1457 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1459 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1461 error ("declaration of C function %q#D conflicts with",
1463 error ("previous declaration %q+#D here", olddecl);
1466 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1467 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1471 return error_mark_node;
1478 error ("conflicting declaration %q#D", newdecl);
1479 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1480 return error_mark_node;
1483 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1484 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1485 && (!DECL_TEMPLATE_INFO (newdecl)
1486 || (DECL_TI_TEMPLATE (newdecl)
1487 != DECL_TI_TEMPLATE (olddecl))))
1488 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1489 && (!DECL_TEMPLATE_INFO (olddecl)
1490 || (DECL_TI_TEMPLATE (olddecl)
1491 != DECL_TI_TEMPLATE (newdecl))))))
1492 /* It's OK to have a template specialization and a non-template
1493 with the same type, or to have specializations of two
1494 different templates with the same type. Note that if one is a
1495 specialization, and the other is an instantiation of the same
1496 template, that we do not exit at this point. That situation
1497 can occur if we instantiate a template class, and then
1498 specialize one of its methods. This situation is valid, but
1499 the declarations must be merged in the usual way. */
1501 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1502 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1503 && !DECL_USE_TEMPLATE (newdecl))
1504 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1505 && !DECL_USE_TEMPLATE (olddecl))))
1506 /* One of the declarations is a template instantiation, and the
1507 other is not a template at all. That's OK. */
1509 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1511 /* In [namespace.alias] we have:
1513 In a declarative region, a namespace-alias-definition can be
1514 used to redefine a namespace-alias declared in that declarative
1515 region to refer only to the namespace to which it already
1518 Therefore, if we encounter a second alias directive for the same
1519 alias, we can just ignore the second directive. */
1520 if (DECL_NAMESPACE_ALIAS (newdecl)
1521 && (DECL_NAMESPACE_ALIAS (newdecl)
1522 == DECL_NAMESPACE_ALIAS (olddecl)))
1524 /* [namespace.alias]
1526 A namespace-name or namespace-alias shall not be declared as
1527 the name of any other entity in the same declarative region.
1528 A namespace-name defined at global scope shall not be
1529 declared as the name of any other entity in any global scope
1531 error ("declaration of namespace %qD conflicts with", newdecl);
1532 error ("previous declaration of namespace %q+D here", olddecl);
1533 return error_mark_node;
1537 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1540 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1541 if (DECL_NAME (olddecl) != NULL_TREE)
1542 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1543 ? "%q+#D previously defined here"
1544 : "%q+#D previously declared here", olddecl);
1545 return error_mark_node;
1547 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1548 && DECL_INITIAL (olddecl) != NULL_TREE
1549 && !prototype_p (TREE_TYPE (olddecl))
1550 && prototype_p (TREE_TYPE (newdecl)))
1552 /* Prototype decl follows defn w/o prototype. */
1553 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1554 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1555 "follows non-prototype definition here");
1557 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1558 || TREE_CODE (olddecl) == VAR_DECL)
1559 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1562 If two declarations of the same function or object
1563 specify different linkage-specifications ..., the program
1564 is ill-formed.... Except for functions with C++ linkage,
1565 a function declaration without a linkage specification
1566 shall not precede the first linkage specification for
1567 that function. A function can be declared without a
1568 linkage specification after an explicit linkage
1569 specification has been seen; the linkage explicitly
1570 specified in the earlier declaration is not affected by
1571 such a function declaration.
1573 DR 563 raises the question why the restrictions on
1574 functions should not also apply to objects. Older
1575 versions of G++ silently ignore the linkage-specification
1583 which is clearly wrong. Therefore, we now treat objects
1585 if (current_lang_depth () == 0)
1587 /* There is no explicit linkage-specification, so we use
1588 the linkage from the previous declaration. */
1589 if (!DECL_LANG_SPECIFIC (newdecl))
1590 retrofit_lang_decl (newdecl);
1591 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1595 error ("previous declaration of %q+#D with %qL linkage",
1596 olddecl, DECL_LANGUAGE (olddecl));
1597 error ("conflicts with new declaration with %qL linkage",
1598 DECL_LANGUAGE (newdecl));
1602 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1604 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1606 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1607 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1610 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1611 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1613 for (; t1 && t1 != void_list_node;
1614 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1615 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1617 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1620 permerror (input_location, "default argument given for parameter %d of %q#D",
1622 permerror (input_location, "after previous specification in %q+#D", olddecl);
1626 error ("default argument given for parameter %d of %q#D",
1628 error ("after previous specification in %q+#D",
1635 /* Do not merge an implicit typedef with an explicit one. In:
1639 typedef class A A __attribute__ ((foo));
1641 the attribute should apply only to the typedef. */
1642 if (TREE_CODE (olddecl) == TYPE_DECL
1643 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1644 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1647 /* If new decl is `static' and an `extern' was seen previously,
1649 warn_extern_redeclared_static (newdecl, olddecl);
1651 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1652 return error_mark_node;
1654 /* We have committed to returning 1 at this point. */
1655 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1657 /* Now that functions must hold information normally held
1658 by field decls, there is extra work to do so that
1659 declaration information does not get destroyed during
1661 if (DECL_VINDEX (olddecl))
1662 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1663 if (DECL_CONTEXT (olddecl))
1664 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1665 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1666 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1667 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1668 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1669 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1670 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1671 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1672 SET_OVERLOADED_OPERATOR_CODE
1673 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1674 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1676 /* Optionally warn about more than one declaration for the same
1677 name, but don't warn about a function declaration followed by a
1679 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1680 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1681 /* Don't warn about extern decl followed by definition. */
1682 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1683 /* Don't warn about friends, let add_friend take care of it. */
1684 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1686 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1687 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1690 if (DECL_DELETED_FN (newdecl))
1692 error ("deleted definition of %qD", newdecl);
1693 error ("after previous declaration %q+D", olddecl);
1695 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1698 /* Deal with C++: must preserve virtual function table size. */
1699 if (TREE_CODE (olddecl) == TYPE_DECL)
1701 tree newtype = TREE_TYPE (newdecl);
1702 tree oldtype = TREE_TYPE (olddecl);
1704 if (newtype != error_mark_node && oldtype != error_mark_node
1705 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1706 CLASSTYPE_FRIEND_CLASSES (newtype)
1707 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1709 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1712 /* Copy all the DECL_... slots specified in the new decl
1713 except for any that we copy here from the old type. */
1714 DECL_ATTRIBUTES (newdecl)
1715 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1717 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1721 old_result = DECL_TEMPLATE_RESULT (olddecl);
1722 new_result = DECL_TEMPLATE_RESULT (newdecl);
1723 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1724 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1725 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1726 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1728 DECL_ATTRIBUTES (old_result)
1729 = (*targetm.merge_decl_attributes) (old_result, new_result);
1731 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1733 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1734 && DECL_INITIAL (new_result))
1736 if (DECL_INITIAL (old_result))
1737 DECL_UNINLINABLE (old_result) = 1;
1739 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1740 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1741 DECL_NOT_REALLY_EXTERN (old_result)
1742 = DECL_NOT_REALLY_EXTERN (new_result);
1743 DECL_INTERFACE_KNOWN (old_result)
1744 = DECL_INTERFACE_KNOWN (new_result);
1745 DECL_DECLARED_INLINE_P (old_result)
1746 = DECL_DECLARED_INLINE_P (new_result);
1747 DECL_DISREGARD_INLINE_LIMITS (old_result)
1748 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1753 DECL_DECLARED_INLINE_P (old_result)
1754 |= DECL_DECLARED_INLINE_P (new_result);
1755 DECL_DISREGARD_INLINE_LIMITS (old_result)
1756 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1757 check_redeclaration_exception_specification (newdecl, olddecl);
1761 /* If the new declaration is a definition, update the file and
1762 line information on the declaration, and also make
1763 the old declaration the same definition. */
1764 if (DECL_INITIAL (new_result) != NULL_TREE)
1766 DECL_SOURCE_LOCATION (olddecl)
1767 = DECL_SOURCE_LOCATION (old_result)
1768 = DECL_SOURCE_LOCATION (newdecl);
1769 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1770 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1773 DECL_ARGUMENTS (old_result)
1774 = DECL_ARGUMENTS (new_result);
1775 for (parm = DECL_ARGUMENTS (old_result); parm;
1776 parm = DECL_CHAIN (parm))
1777 DECL_CONTEXT (parm) = old_result;
1786 /* Automatically handles default parameters. */
1787 tree oldtype = TREE_TYPE (olddecl);
1790 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1791 maybe_instantiate_noexcept (olddecl);
1793 /* Merge the data types specified in the two decls. */
1794 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1796 /* If merge_types produces a non-typedef type, just use the old type. */
1797 if (TREE_CODE (newdecl) == TYPE_DECL
1798 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1801 if (TREE_CODE (newdecl) == VAR_DECL)
1803 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1804 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1805 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1806 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1807 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1808 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1810 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1811 if (DECL_LANG_SPECIFIC (olddecl)
1812 && CP_DECL_THREADPRIVATE_P (olddecl))
1814 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1815 if (!DECL_LANG_SPECIFIC (newdecl))
1816 retrofit_lang_decl (newdecl);
1818 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1819 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1823 /* Do this after calling `merge_types' so that default
1824 parameters don't confuse us. */
1825 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1826 check_redeclaration_exception_specification (newdecl, olddecl);
1827 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1829 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1830 check_default_args (newdecl);
1832 /* Lay the type out, unless already done. */
1833 if (! same_type_p (newtype, oldtype)
1834 && TREE_TYPE (newdecl) != error_mark_node
1835 && !(processing_template_decl && uses_template_parms (newdecl)))
1836 layout_type (TREE_TYPE (newdecl));
1838 if ((TREE_CODE (newdecl) == VAR_DECL
1839 || TREE_CODE (newdecl) == PARM_DECL
1840 || TREE_CODE (newdecl) == RESULT_DECL
1841 || TREE_CODE (newdecl) == FIELD_DECL
1842 || TREE_CODE (newdecl) == TYPE_DECL)
1843 && !(processing_template_decl && uses_template_parms (newdecl)))
1844 layout_decl (newdecl, 0);
1846 /* Merge the type qualifiers. */
1847 if (TREE_READONLY (newdecl))
1848 TREE_READONLY (olddecl) = 1;
1849 if (TREE_THIS_VOLATILE (newdecl))
1850 TREE_THIS_VOLATILE (olddecl) = 1;
1851 if (TREE_NOTHROW (newdecl))
1852 TREE_NOTHROW (olddecl) = 1;
1854 /* Merge deprecatedness. */
1855 if (TREE_DEPRECATED (newdecl))
1856 TREE_DEPRECATED (olddecl) = 1;
1858 /* Preserve function specific target and optimization options */
1859 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1861 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1862 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1863 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1864 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1866 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1867 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1868 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1869 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1872 /* Merge the initialization information. */
1873 if (DECL_INITIAL (newdecl) == NULL_TREE
1874 && DECL_INITIAL (olddecl) != NULL_TREE)
1876 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1877 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1881 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1885 /* Merge the section attribute.
1886 We want to issue an error if the sections conflict but that must be
1887 done later in decl_attributes since we are called before attributes
1889 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1890 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1892 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1894 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1895 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1896 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1897 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1898 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1899 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1900 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1901 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1902 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1903 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1904 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1905 /* Keep the old RTL. */
1906 COPY_DECL_RTL (olddecl, newdecl);
1908 else if (TREE_CODE (newdecl) == VAR_DECL
1909 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1911 /* Keep the old RTL. We cannot keep the old RTL if the old
1912 declaration was for an incomplete object and the new
1913 declaration is not since many attributes of the RTL will
1915 COPY_DECL_RTL (olddecl, newdecl);
1918 /* If cannot merge, then use the new type and qualifiers,
1919 and don't preserve the old rtl. */
1922 /* Clean out any memory we had of the old declaration. */
1923 tree oldstatic = value_member (olddecl, static_aggregates);
1925 TREE_VALUE (oldstatic) = error_mark_node;
1927 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1928 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1929 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1930 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1933 /* Merge the storage class information. */
1934 merge_weak (newdecl, olddecl);
1936 if (DECL_ONE_ONLY (olddecl))
1937 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1939 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1940 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1941 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1942 if (! DECL_EXTERNAL (olddecl))
1943 DECL_EXTERNAL (newdecl) = 0;
1945 new_template_info = NULL_TREE;
1946 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1948 bool new_redefines_gnu_inline = false;
1950 if (new_defines_function
1951 && ((DECL_INTERFACE_KNOWN (olddecl)
1952 && TREE_CODE (olddecl) == FUNCTION_DECL)
1953 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1954 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1955 == FUNCTION_DECL))))
1959 if (TREE_CODE (fn) == TEMPLATE_DECL)
1960 fn = DECL_TEMPLATE_RESULT (olddecl);
1962 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1965 if (!new_redefines_gnu_inline)
1967 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1968 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1969 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1971 DECL_TEMPLATE_INSTANTIATED (newdecl)
1972 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1973 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1975 /* If the OLDDECL is an instantiation and/or specialization,
1976 then the NEWDECL must be too. But, it may not yet be marked
1977 as such if the caller has created NEWDECL, but has not yet
1978 figured out that it is a redeclaration. */
1979 if (!DECL_USE_TEMPLATE (newdecl))
1980 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1982 /* Don't really know how much of the language-specific
1983 values we should copy from old to new. */
1984 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1985 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1986 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1987 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1989 if (LANG_DECL_HAS_MIN (newdecl))
1991 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1992 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1993 if (DECL_TEMPLATE_INFO (newdecl))
1994 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1995 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1997 /* Only functions have these fields. */
1998 if (TREE_CODE (newdecl) == FUNCTION_DECL
1999 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2001 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2002 olddecl_friend = DECL_FRIEND_P (olddecl);
2003 hidden_friend = (DECL_ANTICIPATED (olddecl)
2004 && DECL_HIDDEN_FRIEND_P (olddecl)
2005 && newdecl_is_friend);
2006 DECL_BEFRIENDING_CLASSES (newdecl)
2007 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2008 DECL_BEFRIENDING_CLASSES (olddecl));
2009 /* DECL_THUNKS is only valid for virtual functions,
2010 otherwise it is a DECL_FRIEND_CONTEXT. */
2011 if (DECL_VIRTUAL_P (newdecl))
2012 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2014 /* Only variables have this field. */
2015 else if (TREE_CODE (newdecl) == VAR_DECL
2016 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2017 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2020 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2024 /* Merge parameter attributes. */
2025 tree oldarg, newarg;
2026 for (oldarg = DECL_ARGUMENTS(olddecl),
2027 newarg = DECL_ARGUMENTS(newdecl);
2029 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2030 DECL_ATTRIBUTES (newarg)
2031 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2032 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2035 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2036 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2038 /* If newdecl is not a specialization, then it is not a
2039 template-related function at all. And that means that we
2040 should have exited above, returning 0. */
2041 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2043 if (DECL_ODR_USED (olddecl))
2044 /* From [temp.expl.spec]:
2046 If a template, a member template or the member of a class
2047 template is explicitly specialized then that
2048 specialization shall be declared before the first use of
2049 that specialization that would cause an implicit
2050 instantiation to take place, in every translation unit in
2051 which such a use occurs. */
2052 error ("explicit specialization of %qD after first use",
2055 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2057 /* Don't propagate visibility from the template to the
2058 specialization here. We'll do that in determine_visibility if
2060 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2062 /* [temp.expl.spec/14] We don't inline explicit specialization
2063 just because the primary template says so. */
2065 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2066 the always_inline attribute. */
2067 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2068 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2070 if (DECL_DECLARED_INLINE_P (newdecl))
2071 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2073 DECL_ATTRIBUTES (newdecl)
2074 = remove_attribute ("always_inline",
2075 DECL_ATTRIBUTES (newdecl));
2078 else if (new_defines_function && DECL_INITIAL (olddecl))
2080 /* Never inline re-defined extern inline functions.
2081 FIXME: this could be better handled by keeping both
2082 function as separate declarations. */
2083 DECL_UNINLINABLE (newdecl) = 1;
2087 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2088 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2090 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2092 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2093 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2095 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2096 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2097 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2098 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2101 /* Preserve abstractness on cloned [cd]tors. */
2102 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2104 /* Update newdecl's parms to point at olddecl. */
2105 for (parm = DECL_ARGUMENTS (newdecl); parm;
2106 parm = DECL_CHAIN (parm))
2107 DECL_CONTEXT (parm) = olddecl;
2111 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2112 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2113 COPY_DECL_RTL (newdecl, olddecl);
2115 if (! types_match || new_defines_function)
2117 /* These need to be copied so that the names are available.
2118 Note that if the types do match, we'll preserve inline
2119 info and other bits, but if not, we won't. */
2120 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2121 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2123 if (new_defines_function)
2124 /* If defining a function declared with other language
2125 linkage, use the previously declared language linkage. */
2126 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2127 else if (types_match)
2129 /* If redeclaring a builtin function, and not a definition,
2130 it stays built in. */
2131 if (DECL_BUILT_IN (olddecl))
2133 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2134 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2135 /* If we're keeping the built-in definition, keep the rtl,
2136 regardless of declaration matches. */
2137 COPY_DECL_RTL (olddecl, newdecl);
2140 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2141 /* Don't clear out the arguments if we're just redeclaring a
2143 if (DECL_ARGUMENTS (olddecl))
2144 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2147 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2148 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2150 /* Now preserve various other info from the definition. */
2151 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2152 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2153 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2154 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2156 /* Warn about conflicting visibility specifications. */
2157 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2158 && DECL_VISIBILITY_SPECIFIED (newdecl)
2159 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2161 warning_at (input_location, OPT_Wattributes,
2162 "%q+D: visibility attribute ignored because it", newdecl);
2163 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2164 "conflicts with previous declaration here");
2166 /* Choose the declaration which specified visibility. */
2167 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2169 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2170 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2172 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2173 so keep this behavior. */
2174 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2176 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2177 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2179 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2180 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2181 if (TREE_CODE (newdecl) == FIELD_DECL)
2182 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2184 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2185 with that from NEWDECL below. */
2186 if (DECL_LANG_SPECIFIC (olddecl))
2188 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2189 != DECL_LANG_SPECIFIC (newdecl));
2190 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2193 /* Merge the USED information. */
2194 if (TREE_USED (olddecl))
2195 TREE_USED (newdecl) = 1;
2196 else if (TREE_USED (newdecl))
2197 TREE_USED (olddecl) = 1;
2198 if (TREE_CODE (newdecl) == VAR_DECL)
2200 if (DECL_READ_P (olddecl))
2201 DECL_READ_P (newdecl) = 1;
2202 else if (DECL_READ_P (newdecl))
2203 DECL_READ_P (olddecl) = 1;
2205 if (DECL_PRESERVE_P (olddecl))
2206 DECL_PRESERVE_P (newdecl) = 1;
2207 else if (DECL_PRESERVE_P (newdecl))
2208 DECL_PRESERVE_P (olddecl) = 1;
2210 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2214 function_size = sizeof (struct tree_decl_common);
2216 memcpy ((char *) olddecl + sizeof (struct tree_common),
2217 (char *) newdecl + sizeof (struct tree_common),
2218 function_size - sizeof (struct tree_common));
2220 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2221 (char *) newdecl + sizeof (struct tree_decl_common),
2222 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2223 if (new_template_info)
2224 /* If newdecl is a template instantiation, it is possible that
2225 the following sequence of events has occurred:
2227 o A friend function was declared in a class template. The
2228 class template was instantiated.
2230 o The instantiation of the friend declaration was
2231 recorded on the instantiation list, and is newdecl.
2233 o Later, however, instantiate_class_template called pushdecl
2234 on the newdecl to perform name injection. But, pushdecl in
2235 turn called duplicate_decls when it discovered that another
2236 declaration of a global function with the same name already
2239 o Here, in duplicate_decls, we decided to clobber newdecl.
2241 If we're going to do that, we'd better make sure that
2242 olddecl, and not newdecl, is on the list of
2243 instantiations so that if we try to do the instantiation
2244 again we won't get the clobbered declaration. */
2245 reregister_specialization (newdecl,
2251 size_t size = tree_code_size (TREE_CODE (olddecl));
2252 memcpy ((char *) olddecl + sizeof (struct tree_common),
2253 (char *) newdecl + sizeof (struct tree_common),
2254 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2255 switch (TREE_CODE (olddecl))
2265 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2266 (char *) newdecl + sizeof (struct tree_decl_common),
2267 size - sizeof (struct tree_decl_common)
2268 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2272 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2273 (char *) newdecl + sizeof (struct tree_decl_common),
2274 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2275 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2279 DECL_UID (olddecl) = olddecl_uid;
2281 DECL_FRIEND_P (olddecl) = 1;
2284 DECL_ANTICIPATED (olddecl) = 1;
2285 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2288 /* NEWDECL contains the merged attribute lists.
2289 Update OLDDECL to be the same. */
2290 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2292 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2293 so that encode_section_info has a chance to look at the new decl
2294 flags and attributes. */
2295 if (DECL_RTL_SET_P (olddecl)
2296 && (TREE_CODE (olddecl) == FUNCTION_DECL
2297 || (TREE_CODE (olddecl) == VAR_DECL
2298 && TREE_STATIC (olddecl))))
2299 make_decl_rtl (olddecl);
2301 /* The NEWDECL will no longer be needed. Because every out-of-class
2302 declaration of a member results in a call to duplicate_decls,
2303 freeing these nodes represents in a significant savings. */
2309 /* Return zero if the declaration NEWDECL is valid
2310 when the declaration OLDDECL (assumed to be for the same name)
2311 has already been seen.
2312 Otherwise return an error message format string with a %s
2313 where the identifier should go. */
2316 redeclaration_error_message (tree newdecl, tree olddecl)
2318 if (TREE_CODE (newdecl) == TYPE_DECL)
2320 /* Because C++ can put things into name space for free,
2321 constructs like "typedef struct foo { ... } foo"
2322 would look like an erroneous redeclaration. */
2323 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2326 return G_("redefinition of %q#D");
2328 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2330 /* If this is a pure function, its olddecl will actually be
2331 the original initialization to `0' (which we force to call
2332 abort()). Don't complain about redefinition in this case. */
2333 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2334 && DECL_INITIAL (olddecl) == NULL_TREE)
2337 /* If both functions come from different namespaces, this is not
2338 a redeclaration - this is a conflict with a used function. */
2339 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2340 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2341 && ! decls_match (olddecl, newdecl))
2342 return G_("%qD conflicts with used function");
2344 /* We'll complain about linkage mismatches in
2345 warn_extern_redeclared_static. */
2347 /* Defining the same name twice is no good. */
2348 if (DECL_INITIAL (olddecl) != NULL_TREE
2349 && DECL_INITIAL (newdecl) != NULL_TREE)
2351 if (DECL_NAME (olddecl) == NULL_TREE)
2352 return G_("%q#D not declared in class");
2353 else if (!GNU_INLINE_P (olddecl)
2354 || GNU_INLINE_P (newdecl))
2355 return G_("redefinition of %q#D");
2358 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2360 bool olda = GNU_INLINE_P (olddecl);
2361 bool newa = GNU_INLINE_P (newdecl);
2366 return G_("%q+D redeclared inline with "
2367 "%<gnu_inline%> attribute");
2369 return G_("%q+D redeclared inline without "
2370 "%<gnu_inline%> attribute");
2376 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2380 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2382 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2383 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2384 return G_("redefinition of %q#D");
2388 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2389 || (DECL_TEMPLATE_RESULT (newdecl)
2390 == DECL_TEMPLATE_RESULT (olddecl)))
2393 nt = DECL_TEMPLATE_RESULT (newdecl);
2394 if (DECL_TEMPLATE_INFO (nt))
2395 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2396 ot = DECL_TEMPLATE_RESULT (olddecl);
2397 if (DECL_TEMPLATE_INFO (ot))
2398 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2399 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2400 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2401 return G_("redefinition of %q#D");
2403 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2405 bool olda = GNU_INLINE_P (ot);
2406 bool newa = GNU_INLINE_P (nt);
2411 return G_("%q+D redeclared inline with "
2412 "%<gnu_inline%> attribute");
2414 return G_("%q+D redeclared inline without "
2415 "%<gnu_inline%> attribute");
2419 /* Core issue #226 (C++0x):
2421 If a friend function template declaration specifies a
2422 default template-argument, that declaration shall be a
2423 definition and shall be the only declaration of the
2424 function template in the translation unit. */
2425 if ((cxx_dialect != cxx98)
2426 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2427 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2428 /*is_primary=*/1, /*is_partial=*/0,
2429 /*is_friend_decl=*/2))
2430 return G_("redeclaration of friend %q#D "
2431 "may not have default template arguments");
2435 else if (TREE_CODE (newdecl) == VAR_DECL
2436 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2437 && (! DECL_LANG_SPECIFIC (olddecl)
2438 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2439 || DECL_THREAD_LOCAL_P (newdecl)))
2441 /* Only variables can be thread-local, and all declarations must
2442 agree on this property. */
2443 if (DECL_THREAD_LOCAL_P (newdecl))
2444 return G_("thread-local declaration of %q#D follows "
2445 "non-thread-local declaration");
2447 return G_("non-thread-local declaration of %q#D follows "
2448 "thread-local declaration");
2450 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2452 /* The objects have been declared at namespace scope. If either
2453 is a member of an anonymous union, then this is an invalid
2454 redeclaration. For example:
2460 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2461 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2462 return G_("redeclaration of %q#D");
2463 /* If at least one declaration is a reference, there is no
2464 conflict. For example:
2470 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2472 /* Reject two definitions. */
2473 return G_("redefinition of %q#D");
2477 /* Objects declared with block scope: */
2478 /* Reject two definitions, and reject a definition
2479 together with an external reference. */
2480 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2481 return G_("redeclaration of %q#D");
2486 /* Hash and equality functions for the named_label table. */
2489 named_label_entry_hash (const void *data)
2491 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2492 return DECL_UID (ent->label_decl);
2496 named_label_entry_eq (const void *a, const void *b)
2498 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2499 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2500 return ent_a->label_decl == ent_b->label_decl;
2503 /* Create a new label, named ID. */
2506 make_label_decl (tree id, int local_p)
2508 struct named_label_entry *ent;
2512 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2514 DECL_CONTEXT (decl) = current_function_decl;
2515 DECL_MODE (decl) = VOIDmode;
2516 C_DECLARED_LABEL_FLAG (decl) = local_p;
2518 /* Say where one reference is to the label, for the sake of the
2519 error if it is not defined. */
2520 DECL_SOURCE_LOCATION (decl) = input_location;
2522 /* Record the fact that this identifier is bound to this label. */
2523 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2525 /* Create the label htab for the function on demand. */
2527 named_labels = htab_create_ggc (13, named_label_entry_hash,
2528 named_label_entry_eq, NULL);
2530 /* Record this label on the list of labels used in this function.
2531 We do this before calling make_label_decl so that we get the
2532 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2533 ent = ggc_alloc_cleared_named_label_entry ();
2534 ent->label_decl = decl;
2536 slot = htab_find_slot (named_labels, ent, INSERT);
2537 gcc_assert (*slot == NULL);
2543 /* Look for a label named ID in the current function. If one cannot
2544 be found, create one. (We keep track of used, but undefined,
2545 labels, and complain about them at the end of a function.) */
2548 lookup_label_1 (tree id)
2552 /* You can't use labels at global scope. */
2553 if (current_function_decl == NULL_TREE)
2555 error ("label %qE referenced outside of any function", id);
2559 /* See if we've already got this label. */
2560 decl = IDENTIFIER_LABEL_VALUE (id);
2561 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2564 decl = make_label_decl (id, /*local_p=*/0);
2568 /* Wrapper for lookup_label_1. */
2571 lookup_label (tree id)
2574 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2575 ret = lookup_label_1 (id);
2576 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2580 /* Declare a local label named ID. */
2583 declare_local_label (tree id)
2586 cp_label_binding *bind;
2588 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2589 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2590 bind = VEC_safe_push (cp_label_binding, gc,
2591 current_binding_level->shadowed_labels, NULL);
2592 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2594 decl = make_label_decl (id, /*local_p=*/1);
2600 /* Returns nonzero if it is ill-formed to jump past the declaration of
2601 DECL. Returns 2 if it's also a real problem. */
2604 decl_jump_unsafe (tree decl)
2606 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2607 with automatic storage duration is not in scope to a point where it is
2608 in scope is ill-formed unless the variable has scalar type, class type
2609 with a trivial default constructor and a trivial destructor, a
2610 cv-qualified version of one of these types, or an array of one of the
2611 preceding types and is declared without an initializer (8.5). */
2612 tree type = TREE_TYPE (decl);
2614 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2615 || type == error_mark_node)
2618 type = strip_array_types (type);
2620 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2621 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2624 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2630 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2633 identify_goto (tree decl, const location_t *locus)
2636 permerror (input_location, "jump to label %qD", decl);
2638 permerror (input_location, "jump to case label");
2640 permerror (*locus, " from here");
2643 /* Check that a single previously seen jump to a newly defined label
2644 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2645 the jump context; NAMES are the names in scope in LEVEL at the jump
2646 context; LOCUS is the source position of the jump or 0. Returns
2647 true if all is well. */
2650 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2651 bool exited_omp, const location_t *locus)
2653 cp_binding_level *b;
2654 bool identified = false, saw_eh = false, saw_omp = false;
2658 identify_goto (decl, locus);
2659 error (" exits OpenMP structured block");
2660 identified = saw_omp = true;
2663 for (b = current_binding_level; b ; b = b->level_chain)
2665 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2667 for (new_decls = b->names; new_decls != old_decls;
2668 new_decls = DECL_CHAIN (new_decls))
2670 int problem = decl_jump_unsafe (new_decls);
2676 identify_goto (decl, locus);
2680 error (" crosses initialization of %q+#D", new_decls);
2682 permerror (input_location, " enters scope of %q+#D which has "
2683 "non-trivial destructor", new_decls);
2688 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2692 identify_goto (decl, locus);
2695 if (b->kind == sk_try)
2696 error (" enters try block");
2698 error (" enters catch block");
2701 if (b->kind == sk_omp && !saw_omp)
2705 identify_goto (decl, locus);
2708 error (" enters OpenMP structured block");
2717 check_previous_goto (tree decl, struct named_label_use_entry *use)
2719 check_previous_goto_1 (decl, use->binding_level,
2720 use->names_in_scope, use->in_omp_scope,
2721 &use->o_goto_locus);
2725 check_switch_goto (cp_binding_level* level)
2727 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2730 /* Check that a new jump to a label DECL is OK. Called by
2731 finish_goto_stmt. */
2734 check_goto (tree decl)
2736 struct named_label_entry *ent, dummy;
2737 bool saw_catch = false, identified = false;
2741 /* We can't know where a computed goto is jumping.
2742 So we assume that it's OK. */
2743 if (TREE_CODE (decl) != LABEL_DECL)
2746 /* We didn't record any information about this label when we created it,
2747 and there's not much point since it's trivial to analyze as a return. */
2748 if (decl == cdtor_label)
2751 dummy.label_decl = decl;
2752 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2753 gcc_assert (ent != NULL);
2755 /* If the label hasn't been defined yet, defer checking. */
2756 if (! DECL_INITIAL (decl))
2758 struct named_label_use_entry *new_use;
2760 /* Don't bother creating another use if the last goto had the
2761 same data, and will therefore create the same set of errors. */
2763 && ent->uses->names_in_scope == current_binding_level->names)
2766 new_use = ggc_alloc_named_label_use_entry ();
2767 new_use->binding_level = current_binding_level;
2768 new_use->names_in_scope = current_binding_level->names;
2769 new_use->o_goto_locus = input_location;
2770 new_use->in_omp_scope = false;
2772 new_use->next = ent->uses;
2773 ent->uses = new_use;
2777 if (ent->in_try_scope || ent->in_catch_scope
2778 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2780 permerror (input_location, "jump to label %q+D", decl);
2781 permerror (input_location, " from here");
2785 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2787 int u = decl_jump_unsafe (bad);
2789 if (u > 1 && DECL_ARTIFICIAL (bad))
2791 /* Can't skip init of __exception_info. */
2792 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2796 error (" skips initialization of %q+#D", bad);
2798 permerror (input_location, " enters scope of %q+#D which has "
2799 "non-trivial destructor", bad);
2802 if (ent->in_try_scope)
2803 error (" enters try block");
2804 else if (ent->in_catch_scope && !saw_catch)
2805 error (" enters catch block");
2807 if (ent->in_omp_scope)
2808 error (" enters OpenMP structured block");
2809 else if (flag_openmp)
2811 cp_binding_level *b;
2812 for (b = current_binding_level; b ; b = b->level_chain)
2814 if (b == ent->binding_level)
2816 if (b->kind == sk_omp)
2820 permerror (input_location, "jump to label %q+D", decl);
2821 permerror (input_location, " from here");
2824 error (" exits OpenMP structured block");
2831 /* Check that a return is ok wrt OpenMP structured blocks.
2832 Called by finish_return_stmt. Returns true if all is well. */
2835 check_omp_return (void)
2837 cp_binding_level *b;
2838 for (b = current_binding_level; b ; b = b->level_chain)
2839 if (b->kind == sk_omp)
2841 error ("invalid exit from OpenMP structured block");
2844 else if (b->kind == sk_function_parms)
2849 /* Define a label, specifying the location in the source file.
2850 Return the LABEL_DECL node for the label. */
2853 define_label_1 (location_t location, tree name)
2855 struct named_label_entry *ent, dummy;
2856 cp_binding_level *p;
2859 decl = lookup_label (name);
2861 dummy.label_decl = decl;
2862 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2863 gcc_assert (ent != NULL);
2865 /* After labels, make any new cleanups in the function go into their
2866 own new (temporary) binding contour. */
2867 for (p = current_binding_level;
2868 p->kind != sk_function_parms;
2870 p->more_cleanups_ok = 0;
2872 if (name == get_identifier ("wchar_t"))
2873 permerror (input_location, "label named wchar_t");
2875 if (DECL_INITIAL (decl) != NULL_TREE)
2877 error ("duplicate label %qD", decl);
2878 return error_mark_node;
2882 struct named_label_use_entry *use;
2884 /* Mark label as having been defined. */
2885 DECL_INITIAL (decl) = error_mark_node;
2886 /* Say where in the source. */
2887 DECL_SOURCE_LOCATION (decl) = location;
2889 ent->binding_level = current_binding_level;
2890 ent->names_in_scope = current_binding_level->names;
2892 for (use = ent->uses; use ; use = use->next)
2893 check_previous_goto (decl, use);
2900 /* Wrapper for define_label_1. */
2903 define_label (location_t location, tree name)
2906 timevar_start (TV_NAME_LOOKUP);
2907 ret = define_label_1 (location, name);
2908 timevar_stop (TV_NAME_LOOKUP);
2915 cp_binding_level *level;
2916 struct cp_switch *next;
2917 /* The SWITCH_STMT being built. */
2919 /* A splay-tree mapping the low element of a case range to the high
2920 element, or NULL_TREE if there is no high element. Used to
2921 determine whether or not a new case label duplicates an old case
2922 label. We need a tree, rather than simply a hash table, because
2923 of the GNU case range extension. */
2927 /* A stack of the currently active switch statements. The innermost
2928 switch statement is on the top of the stack. There is no need to
2929 mark the stack for garbage collection because it is only active
2930 during the processing of the body of a function, and we never
2931 collect at that point. */
2933 static struct cp_switch *switch_stack;
2935 /* Called right after a switch-statement condition is parsed.
2936 SWITCH_STMT is the switch statement being parsed. */
2939 push_switch (tree switch_stmt)
2941 struct cp_switch *p = XNEW (struct cp_switch);
2942 p->level = current_binding_level;
2943 p->next = switch_stack;
2944 p->switch_stmt = switch_stmt;
2945 p->cases = splay_tree_new (case_compare, NULL, NULL);
2952 struct cp_switch *cs = switch_stack;
2953 location_t switch_location;
2955 /* Emit warnings as needed. */
2956 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2957 if (!processing_template_decl)
2958 c_do_switch_warnings (cs->cases, switch_location,
2959 SWITCH_STMT_TYPE (cs->switch_stmt),
2960 SWITCH_STMT_COND (cs->switch_stmt));
2962 splay_tree_delete (cs->cases);
2963 switch_stack = switch_stack->next;
2967 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2968 condition. Note that if TYPE and VALUE are already integral we don't
2969 really do the conversion because the language-independent
2970 warning/optimization code will work better that way. */
2973 case_conversion (tree type, tree value)
2975 if (value == NULL_TREE)
2978 if (cxx_dialect >= cxx0x
2979 && (SCOPED_ENUM_P (type)
2980 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
2982 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2983 type = type_promotes_to (type);
2984 value = perform_implicit_conversion (type, value, tf_warning_or_error);
2986 return cxx_constant_value (value);
2989 /* Note that we've seen a definition of a case label, and complain if this
2990 is a bad place for one. */
2993 finish_case_label (location_t loc, tree low_value, tree high_value)
2996 cp_binding_level *p;
2999 if (processing_template_decl)
3003 /* For templates, just add the case label; we'll do semantic
3004 analysis at instantiation-time. */
3005 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3006 return add_stmt (build_case_label (low_value, high_value, label));
3009 /* Find the condition on which this switch statement depends. */
3010 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3011 if (cond && TREE_CODE (cond) == TREE_LIST)
3012 cond = TREE_VALUE (cond);
3014 if (!check_switch_goto (switch_stack->level))
3015 return error_mark_node;
3017 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3019 low_value = case_conversion (type, low_value);
3020 high_value = case_conversion (type, high_value);
3022 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3023 low_value, high_value);
3025 /* After labels, make any new cleanups in the function go into their
3026 own new (temporary) binding contour. */
3027 for (p = current_binding_level;
3028 p->kind != sk_function_parms;
3030 p->more_cleanups_ok = 0;
3035 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3038 typename_hash (const void* k)
3041 const_tree const t = (const_tree) k;
3043 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3044 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3049 typedef struct typename_info {
3057 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3058 really of type `typename_info*' */
3061 typename_compare (const void * k1, const void * k2)
3063 const_tree const t1 = (const_tree) k1;
3064 const typename_info *const t2 = (const typename_info *) k2;
3066 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3067 && TYPE_CONTEXT (t1) == t2->scope
3068 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3069 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3070 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3073 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3074 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3076 Returns the new TYPENAME_TYPE. */
3078 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3081 build_typename_type (tree context, tree name, tree fullname,
3082 enum tag_types tag_type)
3090 if (typename_htab == NULL)
3091 typename_htab = htab_create_ggc (61, &typename_hash,
3092 &typename_compare, NULL);
3094 ti.scope = FROB_CONTEXT (context);
3096 ti.template_id = fullname;
3097 ti.enum_p = tag_type == enum_type;
3098 ti.class_p = (tag_type == class_type
3099 || tag_type == record_type
3100 || tag_type == union_type);
3101 hash = (htab_hash_pointer (ti.scope)
3102 ^ htab_hash_pointer (ti.name));
3104 /* See if we already have this type. */
3105 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3110 /* Build the TYPENAME_TYPE. */
3111 t = cxx_make_type (TYPENAME_TYPE);
3112 TYPE_CONTEXT (t) = ti.scope;
3113 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3114 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3115 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3117 /* Build the corresponding TYPE_DECL. */
3118 d = build_decl (input_location, TYPE_DECL, name, t);
3119 TYPE_NAME (TREE_TYPE (d)) = d;
3120 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3121 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3122 DECL_ARTIFICIAL (d) = 1;
3124 /* Store it in the hash table. */
3127 /* TYPENAME_TYPEs must always be compared structurally, because
3128 they may or may not resolve down to another type depending on
3129 the currently open classes. */
3130 SET_TYPE_STRUCTURAL_EQUALITY (t);
3136 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3137 provided to name the type. Returns an appropriate type, unless an
3138 error occurs, in which case error_mark_node is returned. If we
3139 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3140 return that, rather than the _TYPE it corresponds to, in other
3141 cases we look through the type decl. If TF_ERROR is set, complain
3142 about errors, otherwise be quiet. */
3145 make_typename_type (tree context, tree name, enum tag_types tag_type,
3146 tsubst_flags_t complain)
3152 if (name == error_mark_node
3153 || context == NULL_TREE
3154 || context == error_mark_node)
3155 return error_mark_node;
3159 if (!(TYPE_LANG_SPECIFIC (name)
3160 && (CLASSTYPE_IS_TEMPLATE (name)
3161 || CLASSTYPE_USE_TEMPLATE (name))))
3162 name = TYPE_IDENTIFIER (name);
3164 /* Create a TEMPLATE_ID_EXPR for the type. */
3165 name = build_nt (TEMPLATE_ID_EXPR,
3166 CLASSTYPE_TI_TEMPLATE (name),
3167 CLASSTYPE_TI_ARGS (name));
3169 else if (TREE_CODE (name) == TYPE_DECL)
3170 name = DECL_NAME (name);
3174 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3176 name = TREE_OPERAND (name, 0);
3177 if (TREE_CODE (name) == TEMPLATE_DECL)
3178 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3179 else if (TREE_CODE (name) == OVERLOAD)
3181 error ("%qD is not a type", name);
3182 return error_mark_node;
3185 if (TREE_CODE (name) == TEMPLATE_DECL)
3187 error ("%qD used without template parameters", name);
3188 return error_mark_node;
3190 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3191 gcc_assert (TYPE_P (context));
3193 if (!MAYBE_CLASS_TYPE_P (context))
3195 if (complain & tf_error)
3196 error ("%q#T is not a class", context);
3197 return error_mark_node;
3200 /* When the CONTEXT is a dependent type, NAME could refer to a
3201 dependent base class of CONTEXT. But look inside it anyway
3202 if CONTEXT is a currently open scope, in case it refers to a
3203 member of the current instantiation or a non-dependent base;
3204 lookup will stop when we hit a dependent base. */
3205 if (!dependent_scope_p (context))
3206 /* We should only set WANT_TYPE when we're a nested typename type.
3207 Then we can give better diagnostics if we find a non-type. */
3208 t = lookup_field (context, name, 2, /*want_type=*/true);
3212 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3213 return build_typename_type (context, name, fullname, tag_type);
3215 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3219 if (complain & tf_error)
3220 error (want_template ? "no class template named %q#T in %q#T"
3221 : "no type named %q#T in %q#T", name, context);
3222 return error_mark_node;
3225 /* Pull out the template from an injected-class-name (or multiple). */
3227 t = maybe_get_template_decl_from_type_decl (t);
3229 if (TREE_CODE (t) == TREE_LIST)
3231 if (complain & tf_error)
3233 error ("lookup of %qT in %qT is ambiguous", name, context);
3234 print_candidates (t);
3236 return error_mark_node;
3239 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3241 if (complain & tf_error)
3242 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3244 return error_mark_node;
3246 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3248 if (complain & tf_error)
3249 error ("%<typename %T::%D%> names %q#T, which is not a type",
3251 return error_mark_node;
3254 if (complain & tf_error)
3255 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3257 /* If we are currently parsing a template and if T is a typedef accessed
3258 through CONTEXT then we need to remember and check access of T at
3259 template instantiation time. */
3260 add_typedef_to_current_template_for_access_check (t, context, input_location);
3263 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3265 /*entering_scope=*/0,
3266 tf_warning_or_error | tf_user);
3268 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3274 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3275 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3276 in which case error_mark_node is returned.
3278 If PARM_LIST is non-NULL, also make sure that the template parameter
3279 list of TEMPLATE_DECL matches.
3281 If COMPLAIN zero, don't complain about any errors that occur. */
3284 make_unbound_class_template (tree context, tree name, tree parm_list,
3285 tsubst_flags_t complain)
3291 name = TYPE_IDENTIFIER (name);
3292 else if (DECL_P (name))
3293 name = DECL_NAME (name);
3294 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3296 if (!dependent_type_p (context)
3297 || currently_open_class (context))
3299 tree tmpl = NULL_TREE;
3301 if (MAYBE_CLASS_TYPE_P (context))
3302 tmpl = lookup_field (context, name, 0, false);
3304 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3305 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3307 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3309 if (complain & tf_error)
3310 error ("no class template named %q#T in %q#T", name, context);
3311 return error_mark_node;
3315 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3317 if (complain & tf_error)
3319 error ("template parameters do not match template");
3320 error ("%q+D declared here", tmpl);
3322 return error_mark_node;
3325 if (complain & tf_error)
3326 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3331 /* Build the UNBOUND_CLASS_TEMPLATE. */
3332 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3333 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3334 TREE_TYPE (t) = NULL_TREE;
3335 SET_TYPE_STRUCTURAL_EQUALITY (t);
3337 /* Build the corresponding TEMPLATE_DECL. */
3338 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3339 TYPE_NAME (TREE_TYPE (d)) = d;
3340 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3341 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3342 DECL_ARTIFICIAL (d) = 1;
3343 DECL_TEMPLATE_PARMS (d) = parm_list;
3350 /* Push the declarations of builtin types into the namespace.
3351 RID_INDEX is the index of the builtin type in the array
3352 RID_POINTERS. NAME is the name used when looking up the builtin
3353 type. TYPE is the _TYPE node for the builtin type. */
3356 record_builtin_type (enum rid rid_index,
3360 tree rname = NULL_TREE, tname = NULL_TREE;
3361 tree tdecl = NULL_TREE;
3363 if ((int) rid_index < (int) RID_MAX)
3364 rname = ridpointers[(int) rid_index];
3366 tname = get_identifier (name);
3368 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3369 eliminated. Built-in types should not be looked up name; their
3370 names are keywords that the parser can recognize. However, there
3371 is code in c-common.c that uses identifier_global_value to look
3372 up built-in types by name. */
3375 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3376 DECL_ARTIFICIAL (tdecl) = 1;
3377 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3383 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3384 DECL_ARTIFICIAL (tdecl) = 1;
3386 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3389 if (!TYPE_NAME (type))
3390 TYPE_NAME (type) = tdecl;
3393 debug_hooks->type_decl (tdecl, 0);
3396 /* Record one of the standard Java types.
3397 * Declare it as having the given NAME.
3398 * If SIZE > 0, it is the size of one of the integral types;
3399 * otherwise it is the negative of the size of one of the other types. */
3402 record_builtin_java_type (const char* name, int size)
3407 type = build_nonstandard_integer_type (size, 0);
3408 type = build_distinct_type_copy (type);
3410 else if (size > -32)
3413 /* "__java_char" or ""__java_boolean". */
3414 type = build_nonstandard_integer_type (-size, 1);
3415 type = build_distinct_type_copy (type);
3416 /* Get the signed type cached and attached to the unsigned type,
3417 so it doesn't get garbage-collected at "random" times,
3418 causing potential codegen differences out of different UIDs
3419 and different alias set numbers. */
3420 stype = build_nonstandard_integer_type (-size, 0);
3421 stype = build_distinct_type_copy (stype);
3422 TREE_CHAIN (type) = stype;
3423 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3426 { /* "__java_float" or ""__java_double". */
3427 type = make_node (REAL_TYPE);
3428 TYPE_PRECISION (type) = - size;
3431 record_builtin_type (RID_MAX, name, type);
3432 decl = TYPE_NAME (type);
3434 /* Suppress generate debug symbol entries for these types,
3435 since for normal C++ they are just clutter.
3436 However, push_lang_context undoes this if extern "Java" is seen. */
3437 DECL_IGNORED_P (decl) = 1;
3439 TYPE_FOR_JAVA (type) = 1;
3443 /* Push a type into the namespace so that the back ends ignore it. */
3446 record_unknown_type (tree type, const char* name)
3448 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3449 TYPE_DECL, get_identifier (name), type));
3450 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3451 DECL_IGNORED_P (decl) = 1;
3452 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3453 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3454 TYPE_ALIGN (type) = 1;
3455 TYPE_USER_ALIGN (type) = 0;
3456 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3459 /* A string for which we should create an IDENTIFIER_NODE at
3462 typedef struct predefined_identifier
3464 /* The name of the identifier. */
3465 const char *const name;
3466 /* The place where the IDENTIFIER_NODE should be stored. */
3468 /* Nonzero if this is the name of a constructor or destructor. */
3469 const int ctor_or_dtor_p;
3470 } predefined_identifier;
3472 /* Create all the predefined identifiers. */
3475 initialize_predefined_identifiers (void)
3477 const predefined_identifier *pid;
3479 /* A table of identifiers to create at startup. */
3480 static const predefined_identifier predefined_identifiers[] = {
3481 { "C++", &lang_name_cplusplus, 0 },
3482 { "C", &lang_name_c, 0 },
3483 { "Java", &lang_name_java, 0 },
3484 /* Some of these names have a trailing space so that it is
3485 impossible for them to conflict with names written by users. */
3486 { "__ct ", &ctor_identifier, 1 },
3487 { "__base_ctor ", &base_ctor_identifier, 1 },
3488 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3489 { "__dt ", &dtor_identifier, 1 },
3490 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3491 { "__base_dtor ", &base_dtor_identifier, 1 },
3492 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3493 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3494 { "nelts", &nelts_identifier, 0 },
3495 { THIS_NAME, &this_identifier, 0 },
3496 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3497 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3498 { "_vptr", &vptr_identifier, 0 },
3499 { "__vtt_parm", &vtt_parm_identifier, 0 },
3500 { "::", &global_scope_name, 0 },
3501 { "std", &std_identifier, 0 },
3505 for (pid = predefined_identifiers; pid->name; ++pid)
3507 *pid->node = get_identifier (pid->name);
3508 if (pid->ctor_or_dtor_p)
3509 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3513 /* Create the predefined scalar types of C,
3514 and some nodes representing standard constants (0, 1, (void *)0).
3515 Initialize the global binding level.
3516 Make definitions for built-in primitive functions. */
3519 cxx_init_decl_processing (void)
3522 tree void_ftype_ptr;
3524 /* Create all the identifiers we need. */
3525 initialize_predefined_identifiers ();
3527 /* Create the global variables. */
3528 push_to_top_level ();
3530 current_function_decl = NULL_TREE;
3531 current_binding_level = NULL;
3532 /* Enter the global namespace. */
3533 gcc_assert (global_namespace == NULL_TREE);
3534 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3536 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3537 TREE_PUBLIC (global_namespace) = 1;
3538 begin_scope (sk_namespace, global_namespace);
3540 if (flag_visibility_ms_compat)
3541 default_visibility = VISIBILITY_HIDDEN;
3544 current_lang_name = lang_name_c;
3546 /* Create the `std' namespace. */
3547 push_namespace (std_identifier);
3548 std_node = current_namespace;
3551 c_common_nodes_and_builtins ();
3553 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3554 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3555 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3556 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3557 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3558 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3559 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3560 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3562 integer_two_node = build_int_cst (NULL_TREE, 2);
3564 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3565 truthvalue_type_node = boolean_type_node;
3566 truthvalue_false_node = boolean_false_node;
3567 truthvalue_true_node = boolean_true_node;
3569 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3570 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3571 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3574 record_builtin_type (RID_MAX, NULL, string_type_node);
3577 delta_type_node = ptrdiff_type_node;
3578 vtable_index_type = ptrdiff_type_node;
3580 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3581 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3582 void_ftype_ptr = build_function_type_list (void_type_node,
3583 ptr_type_node, NULL_TREE);
3585 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3587 /* C++ extensions */
3589 unknown_type_node = make_node (LANG_TYPE);
3590 record_unknown_type (unknown_type_node, "unknown type");
3592 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3593 TREE_TYPE (unknown_type_node) = unknown_type_node;
3595 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3597 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3598 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3600 init_list_type_node = make_node (LANG_TYPE);
3601 record_unknown_type (init_list_type_node, "init list");
3603 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3604 record_unknown_type (dependent_lambda_return_type_node,
3605 "undeduced lambda return type");
3608 /* Make sure we get a unique function type, so we can give
3609 its pointer type a name. (This wins for gdb.) */
3610 tree vfunc_type = make_node (FUNCTION_TYPE);
3611 TREE_TYPE (vfunc_type) = integer_type_node;
3612 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3613 layout_type (vfunc_type);
3615 vtable_entry_type = build_pointer_type (vfunc_type);
3617 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3620 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3621 layout_type (vtbl_type_node);
3622 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3623 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3624 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3625 layout_type (vtbl_ptr_type_node);
3626 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3628 push_namespace (get_identifier ("__cxxabiv1"));
3629 abi_node = current_namespace;
3632 global_type_node = make_node (LANG_TYPE);
3633 record_unknown_type (global_type_node, "global type");
3636 current_lang_name = lang_name_cplusplus;
3640 tree newtype, deltype;
3641 tree ptr_ftype_sizetype;
3645 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3646 if (cxx_dialect == cxx98)
3649 tree bad_alloc_type_node;
3650 tree bad_alloc_decl;
3652 push_namespace (std_identifier);
3653 bad_alloc_id = get_identifier ("bad_alloc");
3654 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3655 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3657 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3658 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3662 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3665 new_eh_spec = noexcept_false_spec;
3667 /* Ensure attribs.c is initialized. */
3670 = build_tree_list (get_identifier ("alloc_size"),
3671 build_tree_list (NULL_TREE, integer_one_node));
3672 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3673 newtype = build_exception_variant (newtype, new_eh_spec);
3674 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3675 push_cp_library_fn (NEW_EXPR, newtype);
3676 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3677 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3678 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3680 nullptr_type_node = make_node (NULLPTR_TYPE);
3681 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3682 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3683 TYPE_UNSIGNED (nullptr_type_node) = 1;
3684 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3685 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3686 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3687 nullptr_node = build_int_cst (nullptr_type_node, 0);
3691 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3693 /* Perform other language dependent initializations. */
3694 init_class_processing ();
3695 init_rtti_processing ();
3696 init_template_processing ();
3698 if (flag_exceptions)
3699 init_exception_processing ();
3701 if (! supports_one_only ())
3704 make_fname_decl = cp_make_fname_decl;
3705 start_fname_decls ();
3707 /* Show we use EH for cleanups. */
3708 if (flag_exceptions)
3709 using_eh_for_cleanups ();
3712 /* Generate an initializer for a function naming variable from
3713 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3714 filled in with the type of the init. */
3717 cp_fname_init (const char* name, tree *type_p)
3719 tree domain = NULL_TREE;
3721 tree init = NULL_TREE;
3726 length = strlen (name);
3727 domain = build_index_type (size_int (length));
3728 init = build_string (length + 1, name);
3731 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3732 type = build_cplus_array_type (type, domain);
3737 TREE_TYPE (init) = type;
3739 init = error_mark_node;
3744 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3745 the decl, LOC is the location to give the decl, NAME is the
3746 initialization string and TYPE_DEP indicates whether NAME depended
3747 on the type of the function. We make use of that to detect
3748 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3749 at the point of first use, so we mustn't push the decl now. */
3752 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3754 const char *const name = (type_dep && processing_template_decl
3755 ? NULL : fname_as_string (type_dep));
3757 tree init = cp_fname_init (name, &type);
3758 tree decl = build_decl (loc, VAR_DECL, id, type);
3761 free (CONST_CAST (char *, name));
3763 /* As we're using pushdecl_with_scope, we must set the context. */
3764 DECL_CONTEXT (decl) = current_function_decl;
3765 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3767 TREE_STATIC (decl) = 1;
3768 TREE_READONLY (decl) = 1;
3769 DECL_ARTIFICIAL (decl) = 1;
3771 TREE_USED (decl) = 1;
3773 if (current_function_decl)
3775 cp_binding_level *b = current_binding_level;
3776 if (b->kind == sk_function_parms)
3777 return error_mark_node;
3778 while (b->level_chain->kind != sk_function_parms)
3780 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3781 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3782 LOOKUP_ONLYCONVERTING);
3786 DECL_THIS_STATIC (decl) = true;
3787 pushdecl_top_level_and_finish (decl, init);
3794 builtin_function_1 (tree decl, tree context, bool is_global)
3796 tree id = DECL_NAME (decl);
3797 const char *name = IDENTIFIER_POINTER (id);
3799 retrofit_lang_decl (decl);
3801 DECL_ARTIFICIAL (decl) = 1;
3802 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3803 SET_DECL_LANGUAGE (decl, lang_c);
3804 /* Runtime library routines are, by definition, available in an
3805 external shared object. */
3806 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3807 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3809 DECL_CONTEXT (decl) = context;
3812 pushdecl_top_level (decl);
3816 /* A function in the user's namespace should have an explicit
3817 declaration before it is used. Mark the built-in function as
3818 anticipated but not actually declared. */
3819 if (name[0] != '_' || name[1] != '_')
3820 DECL_ANTICIPATED (decl) = 1;
3821 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3823 size_t len = strlen (name);
3825 /* Treat __*_chk fortification functions as anticipated as well,
3826 unless they are __builtin_*. */
3827 if (len > strlen ("___chk")
3828 && memcmp (name + len - strlen ("_chk"),
3829 "_chk", strlen ("_chk") + 1) == 0)
3830 DECL_ANTICIPATED (decl) = 1;
3837 cxx_builtin_function (tree decl)
3839 tree id = DECL_NAME (decl);
3840 const char *name = IDENTIFIER_POINTER (id);
3841 /* All builtins that don't begin with an '_' should additionally
3842 go in the 'std' namespace. */
3845 tree decl2 = copy_node(decl);
3846 push_namespace (std_identifier);
3847 builtin_function_1 (decl2, std_node, false);
3851 return builtin_function_1 (decl, NULL_TREE, false);
3854 /* Like cxx_builtin_function, but guarantee the function is added to the global
3855 scope. This is to allow function specific options to add new machine
3856 dependent builtins when the target ISA changes via attribute((target(...)))
3857 which saves space on program startup if the program does not use non-generic
3861 cxx_builtin_function_ext_scope (tree decl)
3864 tree id = DECL_NAME (decl);
3865 const char *name = IDENTIFIER_POINTER (id);
3866 /* All builtins that don't begin with an '_' should additionally
3867 go in the 'std' namespace. */
3870 tree decl2 = copy_node(decl);
3871 push_namespace (std_identifier);
3872 builtin_function_1 (decl2, std_node, true);
3876 return builtin_function_1 (decl, NULL_TREE, true);
3879 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3880 function. Not called directly. */
3883 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3885 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3886 DECL_EXTERNAL (fn) = 1;
3887 TREE_PUBLIC (fn) = 1;
3888 DECL_ARTIFICIAL (fn) = 1;
3889 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3890 SET_DECL_LANGUAGE (fn, lang_c);
3891 /* Runtime library routines are, by definition, available in an
3892 external shared object. */
3893 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3894 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3898 /* Returns the _DECL for a library function with C linkage.
3899 We assume that such functions never throw; if this is incorrect,
3900 callers should unset TREE_NOTHROW. */
3903 build_library_fn (tree name, tree type)
3905 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3906 TREE_NOTHROW (fn) = 1;
3910 /* Returns the _DECL for a library function with C++ linkage. */
3913 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3915 tree fn = build_library_fn_1 (name, operator_code, type);
3916 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3917 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3918 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3922 /* Like build_library_fn, but takes a C string instead of an
3926 build_library_fn_ptr (const char* name, tree type)
3928 return build_library_fn (get_identifier (name), type);
3931 /* Like build_cp_library_fn, but takes a C string instead of an
3935 build_cp_library_fn_ptr (const char* name, tree type)
3937 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3940 /* Like build_library_fn, but also pushes the function so that we will
3941 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3942 may throw exceptions listed in RAISES. */
3945 push_library_fn (tree name, tree type, tree raises)
3950 type = build_exception_variant (type, raises);
3952 fn = build_library_fn (name, type);
3953 pushdecl_top_level (fn);
3957 /* Like build_cp_library_fn, but also pushes the function so that it
3958 will be found by normal lookup. */
3961 push_cp_library_fn (enum tree_code operator_code, tree type)
3963 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3970 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3974 push_void_library_fn (tree name, tree parmtypes)
3976 tree type = build_function_type (void_type_node, parmtypes);
3977 return push_library_fn (name, type, NULL_TREE);
3980 /* Like push_library_fn, but also note that this function throws
3981 and does not return. Used for __throw_foo and the like. */
3984 push_throw_library_fn (tree name, tree type)
3986 tree fn = push_library_fn (name, type, NULL_TREE);
3987 TREE_THIS_VOLATILE (fn) = 1;
3988 TREE_NOTHROW (fn) = 0;
3992 /* When we call finish_struct for an anonymous union, we create
3993 default copy constructors and such. But, an anonymous union
3994 shouldn't have such things; this function undoes the damage to the
3995 anonymous union type T.
3997 (The reason that we create the synthesized methods is that we don't
3998 distinguish `union { int i; }' from `typedef union { int i; } U'.
3999 The first is an anonymous union; the second is just an ordinary
4003 fixup_anonymous_aggr (tree t)
4007 /* Wipe out memory of synthesized methods. */
4008 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4009 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4010 TYPE_HAS_COPY_CTOR (t) = 0;
4011 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4012 TYPE_HAS_COPY_ASSIGN (t) = 0;
4013 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4015 /* Splice the implicitly generated functions out of the TYPE_METHODS
4017 q = &TYPE_METHODS (t);
4020 if (DECL_ARTIFICIAL (*q))
4021 *q = TREE_CHAIN (*q);
4023 q = &DECL_CHAIN (*q);
4026 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4027 if (TYPE_METHODS (t))
4029 tree decl = TYPE_MAIN_DECL (t);
4031 if (TREE_CODE (t) != UNION_TYPE)
4032 error_at (DECL_SOURCE_LOCATION (decl),
4033 "an anonymous struct cannot have function members");
4035 error_at (DECL_SOURCE_LOCATION (decl),
4036 "an anonymous union cannot have function members");
4039 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4040 assignment operators (because they cannot have these methods themselves).
4041 For anonymous unions this is already checked because they are not allowed
4042 in any union, otherwise we have to check it. */
4043 if (TREE_CODE (t) != UNION_TYPE)
4047 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4048 if (TREE_CODE (field) == FIELD_DECL)
4050 type = TREE_TYPE (field);
4051 if (CLASS_TYPE_P (type))
4053 if (TYPE_NEEDS_CONSTRUCTING (type))
4054 error ("member %q+#D with constructor not allowed "
4055 "in anonymous aggregate", field);
4056 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4057 error ("member %q+#D with destructor not allowed "
4058 "in anonymous aggregate", field);
4059 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4060 error ("member %q+#D with copy assignment operator "
4061 "not allowed in anonymous aggregate", field);
4067 /* Make sure that a declaration with no declarator is well-formed, i.e.
4068 just declares a tagged type or anonymous union.
4070 Returns the type declared; or NULL_TREE if none. */
4073 check_tag_decl (cp_decl_specifier_seq *declspecs)
4075 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4076 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4077 /* If a class, struct, or enum type is declared by the DECLSPECS
4078 (i.e, if a class-specifier, enum-specifier, or non-typename
4079 elaborated-type-specifier appears in the DECLSPECS),
4080 DECLARED_TYPE is set to the corresponding type. */
4081 tree declared_type = NULL_TREE;
4082 bool error_p = false;
4084 if (declspecs->multiple_types_p)
4085 error ("multiple types in one declaration");
4086 else if (declspecs->redefined_builtin_type)
4088 if (!in_system_header)
4089 permerror (input_location, "redeclaration of C++ built-in type %qT",
4090 declspecs->redefined_builtin_type);
4095 && TYPE_P (declspecs->type)
4096 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4097 && MAYBE_CLASS_TYPE_P (declspecs->type))
4098 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4099 declared_type = declspecs->type;
4100 else if (declspecs->type == error_mark_node)
4102 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4103 permerror (input_location, "declaration does not declare anything");
4104 /* Check for an anonymous union. */
4105 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4106 && TYPE_ANONYMOUS_P (declared_type))
4108 /* 7/3 In a simple-declaration, the optional init-declarator-list
4109 can be omitted only when declaring a class (clause 9) or
4110 enumeration (7.2), that is, when the decl-specifier-seq contains
4111 either a class-specifier, an elaborated-type-specifier with
4112 a class-key (9.1), or an enum-specifier. In these cases and
4113 whenever a class-specifier or enum-specifier is present in the
4114 decl-specifier-seq, the identifiers in these specifiers are among
4115 the names being declared by the declaration (as class-name,
4116 enum-names, or enumerators, depending on the syntax). In such
4117 cases, and except for the declaration of an unnamed bit-field (9.6),
4118 the decl-specifier-seq shall introduce one or more names into the
4119 program, or shall redeclare a name introduced by a previous
4120 declaration. [Example:
4121 enum { }; // ill-formed
4122 typedef class { }; // ill-formed
4126 error ("missing type-name in typedef-declaration");
4129 /* Anonymous unions are objects, so they can have specifiers. */;
4130 SET_ANON_AGGR_TYPE_P (declared_type);
4132 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4133 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4138 if (declspecs->specs[(int)ds_inline]
4139 || declspecs->specs[(int)ds_virtual])
4140 error ("%qs can only be specified for functions",
4141 declspecs->specs[(int)ds_inline]
4142 ? "inline" : "virtual");
4144 && (!current_class_type
4145 || current_scope () != current_class_type))
4146 error ("%<friend%> can only be specified inside a class");
4147 else if (declspecs->specs[(int)ds_explicit])
4148 error ("%<explicit%> can only be specified for constructors");
4149 else if (declspecs->storage_class)
4150 error ("a storage class can only be specified for objects "
4152 else if (declspecs->specs[(int)ds_const]
4153 || declspecs->specs[(int)ds_volatile]
4154 || declspecs->specs[(int)ds_restrict]
4155 || declspecs->specs[(int)ds_thread])
4156 error ("qualifiers can only be specified for objects "
4158 else if (saw_typedef)
4159 warning (0, "%<typedef%> was ignored in this declaration");
4160 else if (declspecs->specs[(int) ds_constexpr])
4161 error ("%<constexpr%> cannot be used for type declarations");
4164 return declared_type;
4167 /* Called when a declaration is seen that contains no names to declare.
4168 If its type is a reference to a structure, union or enum inherited
4169 from a containing scope, shadow that tag name for the current scope
4170 with a forward reference.
4171 If its type defines a new named structure or union
4172 or defines an enum, it is valid but we need not do anything here.
4173 Otherwise, it is an error.
4175 C++: may have to grok the declspecs to learn about static,
4176 complain for anonymous unions.
4178 Returns the TYPE declared -- or NULL_TREE if none. */
4181 shadow_tag (cp_decl_specifier_seq *declspecs)
4183 tree t = check_tag_decl (declspecs);
4188 if (declspecs->attributes)
4190 warning (0, "attribute ignored in declaration of %q+#T", t);
4191 warning (0, "attribute for %q+#T must follow the %qs keyword",
4192 t, class_key_or_enum_as_string (t));
4196 if (maybe_process_partial_specialization (t) == error_mark_node)
4199 /* This is where the variables in an anonymous union are
4200 declared. An anonymous union declaration looks like:
4202 because there is no declarator after the union, the parser
4203 sends that declaration here. */
4204 if (ANON_AGGR_TYPE_P (t))
4206 fixup_anonymous_aggr (t);
4208 if (TYPE_FIELDS (t))
4210 tree decl = grokdeclarator (/*declarator=*/NULL,
4211 declspecs, NORMAL, 0, NULL);
4212 finish_anon_union (decl);
4219 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4222 groktypename (cp_decl_specifier_seq *type_specifiers,
4223 const cp_declarator *declarator,
4224 bool is_template_arg)
4228 enum decl_context context
4229 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4230 attrs = type_specifiers->attributes;
4231 type_specifiers->attributes = NULL_TREE;
4232 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4233 if (attrs && type != error_mark_node)
4235 if (CLASS_TYPE_P (type))
4236 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4237 "outside of definition", type);
4238 else if (MAYBE_CLASS_TYPE_P (type))
4239 /* A template type parameter or other dependent type. */
4240 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4241 "type %qT without an associated declaration", type);
4243 cplus_decl_attributes (&type, attrs, 0);
4248 /* Process a DECLARATOR for a function-scope variable declaration,
4249 namespace-scope variable declaration, or function declaration.
4250 (Function definitions go through start_function; class member
4251 declarations appearing in the body of the class go through
4252 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4253 If an error occurs, the error_mark_node is returned instead.
4255 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4256 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4257 for an explicitly defaulted function, or SD_DELETED for an explicitly
4258 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4259 implicitly initialized via a default constructor. ATTRIBUTES and
4260 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4261 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4262 set, the caller is responsible for calling pop_scope. */
4265 start_decl (const cp_declarator *declarator,
4266 cp_decl_specifier_seq *declspecs,
4269 tree prefix_attributes,
4270 tree *pushed_scope_p)
4278 *pushed_scope_p = NULL_TREE;
4280 /* An object declared as __attribute__((deprecated)) suppresses
4281 warnings of uses of other deprecated items. */
4282 if (lookup_attribute ("deprecated", attributes))
4283 deprecated_state = DEPRECATED_SUPPRESS;
4285 attributes = chainon (attributes, prefix_attributes);
4287 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4290 deprecated_state = DEPRECATED_NORMAL;
4292 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4293 || decl == error_mark_node)
4294 return error_mark_node;
4296 context = CP_DECL_CONTEXT (decl);
4297 if (context != global_namespace)
4298 *pushed_scope_p = push_scope (context);
4301 /* Is it valid for this decl to have an initializer at all?
4302 If not, set INITIALIZED to zero, which will indirectly
4303 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4304 switch (TREE_CODE (decl))
4307 error ("typedef %qD is initialized (use decltype instead)", decl);
4308 return error_mark_node;
4311 if (initialized == SD_DELETED)
4312 /* We'll handle the rest of the semantics later, but we need to
4313 set this now so it's visible to duplicate_decls. */
4314 DECL_DELETED_FN (decl) = 1;
4323 if (! toplevel_bindings_p ()
4324 && DECL_EXTERNAL (decl))
4325 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4327 DECL_EXTERNAL (decl) = 0;
4328 if (toplevel_bindings_p ())
4329 TREE_STATIC (decl) = 1;
4331 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4333 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4334 record_key_method_defined (decl);
4336 /* If this is a typedef that names the class for linkage purposes
4337 (7.1.3p8), apply any attributes directly to the type. */
4338 if (TREE_CODE (decl) == TYPE_DECL
4339 && TAGGED_TYPE_P (TREE_TYPE (decl))
4340 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4341 flags = ATTR_FLAG_TYPE_IN_PLACE;
4345 /* Set attributes here so if duplicate decl, will have proper attributes. */
4346 cplus_decl_attributes (&decl, attributes, flags);
4348 /* Dllimported symbols cannot be defined. Static data members (which
4349 can be initialized in-class and dllimported) go through grokfield,
4350 not here, so we don't need to exclude those decls when checking for
4352 if (initialized && DECL_DLLIMPORT_P (decl))
4354 error ("definition of %q#D is marked %<dllimport%>", decl);
4355 DECL_DLLIMPORT_P (decl) = 0;
4358 /* If #pragma weak was used, mark the decl weak now. */
4359 maybe_apply_pragma_weak (decl);
4361 if (TREE_CODE (decl) == FUNCTION_DECL
4362 && DECL_DECLARED_INLINE_P (decl)
4363 && DECL_UNINLINABLE (decl)
4364 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4365 warning (0, "inline function %q+D given attribute noinline", decl);
4367 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4369 if (TREE_CODE (decl) == VAR_DECL)
4371 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4372 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4373 error ("%q#D is not a static member of %q#T", decl, context);
4376 if (DECL_CONTEXT (field) != context)
4378 if (!same_type_p (DECL_CONTEXT (field), context))
4379 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4380 "to be defined as %<%T::%D%>",
4381 DECL_CONTEXT (field), DECL_NAME (decl),
4382 context, DECL_NAME (decl));
4383 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4385 if (processing_specialization
4386 && template_class_depth (context) == 0
4387 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4388 error ("template header not allowed in member definition "
4389 "of explicitly specialized class");
4390 /* Static data member are tricky; an in-class initialization
4391 still doesn't provide a definition, so the in-class
4392 declaration will have DECL_EXTERNAL set, but will have an
4393 initialization. Thus, duplicate_decls won't warn
4394 about this situation, and so we check here. */
4395 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4396 error ("duplicate initialization of %qD", decl);
4397 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4399 if (declspecs->specs[(int) ds_constexpr]
4400 && !DECL_DECLARED_CONSTEXPR_P (field))
4401 error ("%qD declared %<constexpr%> outside its class", field);
4406 tree field = check_classfn (context, decl,
4407 (processing_template_decl
4408 > template_class_depth (context))
4409 ? current_template_parms
4411 if (field && field != error_mark_node
4412 && duplicate_decls (decl, field,
4413 /*newdecl_is_friend=*/false))
4417 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4418 DECL_IN_AGGR_P (decl) = 0;
4419 /* Do not mark DECL as an explicit specialization if it was not
4420 already marked as an instantiation; a declaration should
4421 never be marked as a specialization unless we know what
4422 template is being specialized. */
4423 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4425 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4427 /* [temp.expl.spec] An explicit specialization of a static data
4428 member of a template is a definition if the declaration
4429 includes an initializer; otherwise, it is a declaration.
4431 We check for processing_specialization so this only applies
4432 to the new specialization syntax. */
4433 if (!initialized && processing_specialization)
4434 DECL_EXTERNAL (decl) = 1;
4437 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4438 /* Aliases are definitions. */
4440 permerror (input_location, "declaration of %q#D outside of class is not definition",
4444 was_public = TREE_PUBLIC (decl);
4446 /* Enter this declaration into the symbol table. */
4447 decl = maybe_push_decl (decl);
4449 if (processing_template_decl)
4450 decl = push_template_decl (decl);
4451 if (decl == error_mark_node)
4452 return error_mark_node;
4454 /* Tell the back end to use or not use .common as appropriate. If we say
4455 -fconserve-space, we want this to save .data space, at the expense of
4456 wrong semantics. If we say -fno-conserve-space, we want this to
4457 produce errors about redefs; to do this we force variables into the
4459 if (flag_conserve_space
4460 && TREE_CODE (decl) == VAR_DECL
4461 && TREE_PUBLIC (decl)
4462 && !DECL_THREAD_LOCAL_P (decl)
4463 && !have_global_bss_p ())
4464 DECL_COMMON (decl) = 1;
4466 if (TREE_CODE (decl) == VAR_DECL
4467 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4468 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4470 /* This is a const variable with implicit 'static'. Set
4471 DECL_THIS_STATIC so we can tell it from variables that are
4472 !TREE_PUBLIC because of the anonymous namespace. */
4473 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4474 DECL_THIS_STATIC (decl) = 1;
4477 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4478 start_decl_1 (decl, initialized);
4483 /* Process the declaration of a variable DECL. INITIALIZED is true
4484 iff DECL is explicitly initialized. (INITIALIZED is false if the
4485 variable is initialized via an implicitly-called constructor.)
4486 This function must be called for ordinary variables (including, for
4487 example, implicit instantiations of templates), but must not be
4488 called for template declarations. */
4491 start_decl_1 (tree decl, bool initialized)
4495 bool aggregate_definition_p;
4497 gcc_assert (!processing_template_decl);
4499 if (error_operand_p (decl))
4502 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4504 type = TREE_TYPE (decl);
4505 complete_p = COMPLETE_TYPE_P (type);
4506 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4508 /* If an explicit initializer is present, or if this is a definition
4509 of an aggregate, then we need a complete type at this point.
4510 (Scalars are always complete types, so there is nothing to
4511 check.) This code just sets COMPLETE_P; errors (if necessary)
4512 are issued below. */
4513 if ((initialized || aggregate_definition_p)
4515 && COMPLETE_TYPE_P (complete_type (type)))
4518 /* We will not yet have set TREE_READONLY on DECL if the type
4519 was "const", but incomplete, before this point. But, now, we
4520 have a complete type, so we can try again. */
4521 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4525 /* Is it valid for this decl to have an initializer at all? */
4527 /* Don't allow initializations for incomplete types except for
4528 arrays which might be completed by the initialization. */
4530 ; /* A complete type is ok. */
4531 else if (type_uses_auto (type))
4532 ; /* An auto type is ok. */
4533 else if (TREE_CODE (type) != ARRAY_TYPE)
4535 error ("variable %q#D has initializer but incomplete type", decl);
4536 type = TREE_TYPE (decl) = error_mark_node;
4538 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4540 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4541 error ("elements of array %q#D have incomplete type", decl);
4542 /* else we already gave an error in start_decl. */
4545 else if (aggregate_definition_p && !complete_p)
4547 if (type_uses_auto (type))
4548 error ("declaration of %q#D has no initializer", decl);
4550 error ("aggregate %q#D has incomplete type and cannot be defined",
4552 /* Change the type so that assemble_variable will give
4553 DECL an rtl we can live with: (mem (const_int 0)). */
4554 type = TREE_TYPE (decl) = error_mark_node;
4557 /* Create a new scope to hold this declaration if necessary.
4558 Whether or not a new scope is necessary cannot be determined
4559 until after the type has been completed; if the type is a
4560 specialization of a class template it is not until after
4561 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4562 will be set correctly. */
4563 maybe_push_cleanup_level (type);
4566 /* Handle initialization of references. DECL, TYPE, and INIT have the
4567 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4568 but will be set to a new CLEANUP_STMT if a temporary is created
4569 that must be destroyed subsequently.
4571 Returns an initializer expression to use to initialize DECL, or
4572 NULL if the initialization can be performed statically.
4574 Quotes on semantics can be found in ARM 8.4.3. */
4577 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4581 if (init == NULL_TREE)
4583 if ((DECL_LANG_SPECIFIC (decl) == 0
4584 || DECL_IN_AGGR_P (decl) == 0)
4585 && ! DECL_THIS_EXTERN (decl))
4586 error ("%qD declared as reference but not initialized", decl);
4590 if (TREE_CODE (init) == TREE_LIST)
4591 init = build_x_compound_expr_from_list (init, ELK_INIT,
4592 tf_warning_or_error);
4594 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4595 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4596 /* Note: default conversion is only called in very special cases. */
4597 init = decay_conversion (init);
4599 /* Convert INIT to the reference type TYPE. This may involve the
4600 creation of a temporary, whose lifetime must be the same as that
4601 of the reference. If so, a DECL_EXPR for the temporary will be
4602 added just after the DECL_EXPR for DECL. That's why we don't set
4603 DECL_INITIAL for local references (instead assigning to them
4604 explicitly); we need to allow the temporary to be initialized
4606 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4607 if (DECL_DECLARED_CONSTEXPR_P (decl))
4609 tmp = cxx_constant_value (tmp);
4610 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4611 = reduced_constant_expression_p (tmp);
4614 if (tmp == error_mark_node)
4616 else if (tmp == NULL_TREE)
4618 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4622 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4625 DECL_INITIAL (decl) = tmp;
4630 /* Subroutine of check_initializer. We're initializing a DECL of
4631 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4632 extend the lifetime of the underlying array to match that of the decl,
4633 just like for reference initialization. CLEANUP is as for
4634 grok_reference_init. */
4637 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4640 tree aggr_init, array, arrtype;
4641 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4642 if (error_operand_p (init))
4643 return error_mark_node;
4645 aggr_init = TARGET_EXPR_INITIAL (init);
4646 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4647 arrtype = TREE_TYPE (array);
4649 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4650 array = TREE_OPERAND (array, 0);
4651 /* If the array is constant, finish_compound_literal already made it a
4652 static variable and we don't need to do anything here. */
4653 if (decl && TREE_CODE (array) == TARGET_EXPR)
4655 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4656 var = build_address (var);
4657 var = convert (arrtype, var);
4658 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4663 /* Designated initializers in arrays are not supported in GNU C++.
4664 The parser cannot detect this error since it does not know whether
4665 a given brace-enclosed initializer is for a class type or for an
4666 array. This function checks that CE does not use a designated
4667 initializer. If it does, an error is issued. Returns true if CE
4668 is valid, i.e., does not have a designated initializer. */
4671 check_array_designated_initializer (const constructor_elt *ce,
4672 unsigned HOST_WIDE_INT index)
4674 /* Designated initializers for array elements are not supported. */
4677 /* The parser only allows identifiers as designated
4679 if (ce->index == error_mark_node)
4680 error ("name used in a GNU-style designated "
4681 "initializer for an array");
4682 else if (TREE_CODE (ce->index) == INTEGER_CST)
4684 /* A C99 designator is OK if it matches the current index. */
4685 if (TREE_INT_CST_LOW (ce->index) == index)
4688 sorry ("non-trivial designated initializers not supported");
4692 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4693 error ("name %qD used in a GNU-style designated "
4694 "initializer for an array", ce->index);
4702 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4703 array until we finish parsing the initializer. If that's the
4704 situation we're in, update DECL accordingly. */
4707 maybe_deduce_size_from_array_init (tree decl, tree init)
4709 tree type = TREE_TYPE (decl);
4711 if (TREE_CODE (type) == ARRAY_TYPE
4712 && TYPE_DOMAIN (type) == NULL_TREE
4713 && TREE_CODE (decl) != TYPE_DECL)
4715 /* do_default is really a C-ism to deal with tentative definitions.
4716 But let's leave it here to ease the eventual merge. */
4717 int do_default = !DECL_EXTERNAL (decl);
4718 tree initializer = init ? init : DECL_INITIAL (decl);
4721 /* Check that there are no designated initializers in INIT, as
4722 those are not supported in GNU C++, and as the middle-end
4723 will crash if presented with a non-numeric designated
4725 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4727 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4728 constructor_elt *ce;
4730 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4731 if (!check_array_designated_initializer (ce, i))
4737 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4741 error ("initializer fails to determine size of %qD", decl);
4742 TREE_TYPE (decl) = error_mark_node;
4744 else if (failure == 2)
4748 error ("array size missing in %qD", decl);
4749 TREE_TYPE (decl) = error_mark_node;
4751 /* If a `static' var's size isn't known, make it extern as
4752 well as static, so it does not get allocated. If it's not
4753 `static', then don't mark it extern; finish_incomplete_decl
4754 will give it a default size and it will get allocated. */
4755 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4756 DECL_EXTERNAL (decl) = 1;
4758 else if (failure == 3)
4760 error ("zero-size array %qD", decl);
4761 TREE_TYPE (decl) = error_mark_node;
4765 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4767 relayout_decl (decl);
4771 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4772 any appropriate error messages regarding the layout. */
4775 layout_var_decl (tree decl)
4779 type = TREE_TYPE (decl);
4780 if (type == error_mark_node)
4783 /* If we haven't already layed out this declaration, do so now.
4784 Note that we must not call complete type for an external object
4785 because it's type might involve templates that we are not
4786 supposed to instantiate yet. (And it's perfectly valid to say
4787 `extern X x' for some incomplete type `X'.) */
4788 if (!DECL_EXTERNAL (decl))
4789 complete_type (type);
4790 if (!DECL_SIZE (decl)
4791 && TREE_TYPE (decl) != error_mark_node
4792 && (COMPLETE_TYPE_P (type)
4793 || (TREE_CODE (type) == ARRAY_TYPE
4794 && !TYPE_DOMAIN (type)
4795 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4796 layout_decl (decl, 0);
4798 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4800 /* An automatic variable with an incomplete type: that is an error.
4801 Don't talk about array types here, since we took care of that
4802 message in grokdeclarator. */
4803 error ("storage size of %qD isn%'t known", decl);
4804 TREE_TYPE (decl) = error_mark_node;
4807 /* Keep this code around in case we later want to control debug info
4808 based on whether a type is "used". (jason 1999-11-11) */
4810 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4811 /* Let debugger know it should output info for this type. */
4812 note_debug_info_needed (ttype);
4814 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4815 note_debug_info_needed (DECL_CONTEXT (decl));
4818 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4819 && DECL_SIZE (decl) != NULL_TREE
4820 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4822 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4823 constant_expression_warning (DECL_SIZE (decl));
4826 error ("storage size of %qD isn%'t constant", decl);
4827 TREE_TYPE (decl) = error_mark_node;
4832 /* If a local static variable is declared in an inline function, or if
4833 we have a weak definition, we must endeavor to create only one
4834 instance of the variable at link-time. */
4837 maybe_commonize_var (tree decl)
4839 /* Static data in a function with comdat linkage also has comdat
4841 if (TREE_STATIC (decl)
4842 /* Don't mess with __FUNCTION__. */
4843 && ! DECL_ARTIFICIAL (decl)
4844 && DECL_FUNCTION_SCOPE_P (decl)
4845 && vague_linkage_p (DECL_CONTEXT (decl)))
4849 /* With weak symbols, we simply make the variable COMDAT;
4850 that will cause copies in multiple translations units to
4852 comdat_linkage (decl);
4856 if (DECL_INITIAL (decl) == NULL_TREE
4857 || DECL_INITIAL (decl) == error_mark_node)
4859 /* Without weak symbols, we can use COMMON to merge
4860 uninitialized variables. */
4861 TREE_PUBLIC (decl) = 1;
4862 DECL_COMMON (decl) = 1;
4866 /* While for initialized variables, we must use internal
4867 linkage -- which means that multiple copies will not
4869 TREE_PUBLIC (decl) = 0;
4870 DECL_COMMON (decl) = 0;
4871 warning_at (input_location, 0,
4872 "sorry: semantics of inline function static "
4873 "data %q+#D are wrong (you%'ll wind up "
4874 "with multiple copies)", decl);
4875 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4876 " you can work around this by removing "
4881 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4882 /* Set it up again; we might have set DECL_INITIAL since the last
4884 comdat_linkage (decl);
4887 /* Issue an error message if DECL is an uninitialized const variable. */
4890 check_for_uninitialized_const_var (tree decl)
4892 tree type = strip_array_types (TREE_TYPE (decl));
4894 /* ``Unless explicitly declared extern, a const object does not have
4895 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4897 if (TREE_CODE (decl) == VAR_DECL
4898 && TREE_CODE (type) != REFERENCE_TYPE
4899 && CP_TYPE_CONST_P (type)
4900 && (!TYPE_NEEDS_CONSTRUCTING (type)
4901 || !type_has_user_provided_default_constructor (type))
4902 && !DECL_INITIAL (decl))
4904 permerror (DECL_SOURCE_LOCATION (decl),
4905 "uninitialized const %qD", decl);
4907 if (CLASS_TYPE_P (type)
4908 && !type_has_user_provided_default_constructor (type))
4910 tree defaulted_ctor;
4912 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4913 "%q#T has no user-provided default constructor", type);
4914 defaulted_ctor = in_class_defaulted_default_constructor (type);
4916 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4917 "constructor is not user-provided because it is "
4918 "explicitly defaulted in the class body");
4923 /* Structure holding the current initializer being processed by reshape_init.
4924 CUR is a pointer to the current element being processed, END is a pointer
4925 after the last element present in the initializer. */
4926 typedef struct reshape_iterator_t
4928 constructor_elt *cur;
4929 constructor_elt *end;
4932 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4934 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4935 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4936 initialized. If there are no more such fields, the return value
4940 next_initializable_field (tree field)
4943 && (TREE_CODE (field) != FIELD_DECL
4944 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4945 || DECL_ARTIFICIAL (field)))
4946 field = DECL_CHAIN (field);
4951 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4952 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4953 INTEGER_CST representing the size of the array minus one (the maximum index),
4954 or NULL_TREE if the array was declared without specifying the size. D is
4955 the iterator within the constructor. */
4958 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4959 tsubst_flags_t complain)
4962 bool sized_array_p = (max_index != NULL_TREE);
4963 unsigned HOST_WIDE_INT max_index_cst = 0;
4964 unsigned HOST_WIDE_INT index;
4966 /* The initializer for an array is always a CONSTRUCTOR. */
4967 new_init = build_constructor (init_list_type_node, NULL);
4971 /* Minus 1 is used for zero sized arrays. */
4972 if (integer_all_onesp (max_index))
4975 if (host_integerp (max_index, 1))
4976 max_index_cst = tree_low_cst (max_index, 1);
4977 /* sizetype is sign extended, not zero extended. */
4979 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4983 /* Loop until there are no more initializers. */
4985 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4990 check_array_designated_initializer (d->cur, index);
4991 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4993 if (elt_init == error_mark_node)
4994 return error_mark_node;
4995 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4996 size_int (index), elt_init);
4997 if (!TREE_CONSTANT (elt_init))
4998 TREE_CONSTANT (new_init) = false;
5004 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5005 Parameters are the same of reshape_init_r. */
5008 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5010 tree max_index = NULL_TREE;
5012 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5014 if (TYPE_DOMAIN (type))
5015 max_index = array_type_nelts (type);
5017 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5020 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5021 Parameters are the same of reshape_init_r. */
5024 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5026 tree max_index = NULL_TREE;
5028 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5030 if (COMPOUND_LITERAL_P (d->cur->value))
5032 tree value = d->cur->value;
5033 if (!same_type_p (TREE_TYPE (value), type))
5035 if (complain & tf_error)
5036 error ("invalid type %qT as initializer for a vector of type %qT",
5037 TREE_TYPE (d->cur->value), type);
5038 value = error_mark_node;
5044 /* For a vector, we initialize it as an array of the appropriate size. */
5045 if (TREE_CODE (type) == VECTOR_TYPE)
5046 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5048 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5051 /* Subroutine of reshape_init_r, processes the initializers for classes
5052 or union. Parameters are the same of reshape_init_r. */
5055 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5056 tsubst_flags_t complain)
5061 gcc_assert (CLASS_TYPE_P (type));
5063 /* The initializer for a class is always a CONSTRUCTOR. */
5064 new_init = build_constructor (init_list_type_node, NULL);
5065 field = next_initializable_field (TYPE_FIELDS (type));
5071 An initializer for an aggregate member that is an
5072 empty class shall have the form of an empty
5073 initializer-list {}. */
5074 if (!first_initializer_p)
5076 if (complain & tf_error)
5077 error ("initializer for %qT must be brace-enclosed", type);
5078 return error_mark_node;
5083 /* Loop through the initializable fields, gathering initializers. */
5084 while (d->cur != d->end)
5088 /* Handle designated initializers, as an extension. */
5091 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5093 if (!field || TREE_CODE (field) != FIELD_DECL)
5095 if (complain & tf_error)
5096 error ("%qT has no non-static data member named %qD", type,
5098 return error_mark_node;
5102 /* If we processed all the member of the class, we are done. */
5106 field_init = reshape_init_r (TREE_TYPE (field), d,
5107 /*first_initializer_p=*/false, complain);
5108 if (field_init == error_mark_node)
5109 return error_mark_node;
5111 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5115 When a union is initialized with a brace-enclosed
5116 initializer, the braces shall only contain an
5117 initializer for the first member of the union. */
5118 if (TREE_CODE (type) == UNION_TYPE)
5121 field = next_initializable_field (DECL_CHAIN (field));
5127 /* Subroutine of reshape_init, which processes a single initializer (part of
5128 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5129 iterator within the CONSTRUCTOR which points to the initializer to process.
5130 FIRST_INITIALIZER_P is true if this is the first initializer of the
5131 outermost CONSTRUCTOR node. */
5134 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5135 tsubst_flags_t complain)
5137 tree init = d->cur->value;
5139 if (error_operand_p (init))
5140 return error_mark_node;
5142 if (TREE_CODE (type) == COMPLEX_TYPE)
5144 /* A complex type can be initialized from one or two initializers,
5145 but braces are not elided. */
5147 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5149 if (CONSTRUCTOR_NELTS (init) > 2)
5151 if (complain & tf_error)
5152 error ("too many initializers for %qT", type);
5154 return error_mark_node;
5157 else if (first_initializer_p && d->cur != d->end)
5159 VEC(constructor_elt, gc) *v = 0;
5160 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5161 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5163 init = build_constructor (init_list_type_node, v);
5168 /* A non-aggregate type is always initialized with a single
5170 if (!CP_AGGREGATE_TYPE_P (type))
5172 /* It is invalid to initialize a non-aggregate type with a
5173 brace-enclosed initializer before C++0x.
5174 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5175 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5176 a CONSTRUCTOR (with a record type). */
5177 if (TREE_CODE (init) == CONSTRUCTOR
5178 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5180 if (SCALAR_TYPE_P (type))
5182 if (complain & tf_error)
5183 error ("braces around scalar initializer for type %qT", type);
5184 init = error_mark_node;
5187 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5196 All implicit type conversions (clause _conv_) are considered when
5197 initializing the aggregate member with an initializer from an
5198 initializer-list. If the initializer can initialize a member,
5199 the member is initialized. Otherwise, if the member is itself a
5200 non-empty subaggregate, brace elision is assumed and the
5201 initializer is considered for the initialization of the first
5202 member of the subaggregate. */
5203 if (TREE_CODE (init) != CONSTRUCTOR
5204 /* But don't try this for the first initializer, since that would be
5205 looking through the outermost braces; A a2 = { a1 }; is not a
5206 valid aggregate initialization. */
5207 && !first_initializer_p
5208 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5209 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5215 /* [dcl.init.string]
5217 A char array (whether plain char, signed char, or unsigned char)
5218 can be initialized by a string-literal (optionally enclosed in
5219 braces); a wchar_t array can be initialized by a wide
5220 string-literal (optionally enclosed in braces). */
5221 if (TREE_CODE (type) == ARRAY_TYPE
5222 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5224 tree str_init = init;
5226 /* Strip one level of braces if and only if they enclose a single
5227 element (as allowed by [dcl.init.string]). */
5228 if (!first_initializer_p
5229 && TREE_CODE (str_init) == CONSTRUCTOR
5230 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5232 str_init = VEC_index (constructor_elt,
5233 CONSTRUCTOR_ELTS (str_init), 0)->value;
5236 /* If it's a string literal, then it's the initializer for the array
5237 as a whole. Otherwise, continue with normal initialization for
5238 array types (one value per array element). */
5239 if (TREE_CODE (str_init) == STRING_CST)
5246 /* The following cases are about aggregates. If we are not within a full
5247 initializer already, and there is not a CONSTRUCTOR, it means that there
5248 is a missing set of braces (that is, we are processing the case for
5249 which reshape_init exists). */
5250 if (!first_initializer_p)
5252 if (TREE_CODE (init) == CONSTRUCTOR)
5254 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5255 /* There is no need to reshape pointer-to-member function
5256 initializers, as they are always constructed correctly
5257 by the front end. */
5259 else if (COMPOUND_LITERAL_P (init))
5260 /* For a nested compound literal, there is no need to reshape since
5261 brace elision is not allowed. Even if we decided to allow it,
5262 we should add a call to reshape_init in finish_compound_literal,
5263 before calling digest_init, so changing this code would still
5264 not be necessary. */
5265 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5269 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5270 return reshape_init (type, init, complain);
5274 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5278 /* Dispatch to specialized routines. */
5279 if (CLASS_TYPE_P (type))
5280 return reshape_init_class (type, d, first_initializer_p, complain);
5281 else if (TREE_CODE (type) == ARRAY_TYPE)
5282 return reshape_init_array (type, d, complain);
5283 else if (TREE_CODE (type) == VECTOR_TYPE)
5284 return reshape_init_vector (type, d, complain);
5289 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5290 brace-enclosed aggregate initializer.
5292 INIT is the CONSTRUCTOR containing the list of initializers describing
5293 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5294 It may not presently match the shape of the TYPE; for example:
5296 struct S { int a; int b; };
5297 struct S a[] = { 1, 2, 3, 4 };
5299 Here INIT will hold a VEC of four elements, rather than a
5300 VEC of two elements, each itself a VEC of two elements. This
5301 routine transforms INIT from the former form into the latter. The
5302 revised CONSTRUCTOR node is returned. */
5305 reshape_init (tree type, tree init, tsubst_flags_t complain)
5307 VEC(constructor_elt, gc) *v;
5311 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5313 v = CONSTRUCTOR_ELTS (init);
5315 /* An empty constructor does not need reshaping, and it is always a valid
5317 if (VEC_empty (constructor_elt, v))
5320 /* Recurse on this CONSTRUCTOR. */
5321 d.cur = VEC_index (constructor_elt, v, 0);
5322 d.end = d.cur + VEC_length (constructor_elt, v);
5324 new_init = reshape_init_r (type, &d, true, complain);
5325 if (new_init == error_mark_node)
5326 return error_mark_node;
5328 /* Make sure all the element of the constructor were used. Otherwise,
5329 issue an error about exceeding initializers. */
5332 if (complain & tf_error)
5333 error ("too many initializers for %qT", type);
5335 return error_mark_node;
5341 /* Verify array initializer. Returns true if errors have been reported. */
5344 check_array_initializer (tree decl, tree type, tree init)
5346 tree element_type = TREE_TYPE (type);
5348 /* The array type itself need not be complete, because the
5349 initializer may tell us how many elements are in the array.
5350 But, the elements of the array must be complete. */
5351 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5354 error ("elements of array %q#D have incomplete type", decl);
5356 error ("elements of array %q#T have incomplete type", type);
5359 /* It is not valid to initialize a VLA. */
5361 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5362 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5365 error ("variable-sized object %qD may not be initialized", decl);
5367 error ("variable-sized compound literal");
5373 /* Subroutine of check_initializer; args are passed down from that function.
5374 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5377 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5380 int saved_stmts_are_full_exprs_p = 0;
5381 if (building_stmt_list_p ())
5383 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5384 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5386 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5387 if (building_stmt_list_p ())
5388 current_stmt_tree ()->stmts_are_full_exprs_p =
5389 saved_stmts_are_full_exprs_p;
5393 /* Verify INIT (the initializer for DECL), and record the
5394 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5395 grok_reference_init.
5397 If the return value is non-NULL, it is an expression that must be
5398 evaluated dynamically to initialize DECL. */
5401 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5403 tree type = TREE_TYPE (decl);
5404 tree init_code = NULL;
5405 tree extra_init = NULL_TREE;
5408 /* Things that are going to be initialized need to have complete
5410 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5412 if (DECL_HAS_VALUE_EXPR_P (decl))
5414 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5415 it doesn't have storage to be initialized. */
5416 gcc_assert (init == NULL_TREE);
5420 if (type == error_mark_node)
5421 /* We will have already complained. */
5424 if (TREE_CODE (type) == ARRAY_TYPE)
5426 if (check_array_initializer (decl, type, init))
5429 else if (!COMPLETE_TYPE_P (type))
5431 error ("%qD has incomplete type", decl);
5432 TREE_TYPE (decl) = error_mark_node;
5436 /* There is no way to make a variable-sized class type in GNU C++. */
5437 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5439 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5441 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5442 if (SCALAR_TYPE_P (type))
5446 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5447 init = build_zero_init (type, NULL_TREE, false);
5449 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5451 error ("scalar object %qD requires one element in initializer",
5453 TREE_TYPE (decl) = error_mark_node;
5459 if (TREE_CODE (decl) == CONST_DECL)
5461 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5463 DECL_INITIAL (decl) = init;
5465 gcc_assert (init != NULL_TREE);
5468 else if (!init && DECL_REALLY_EXTERN (decl))
5470 else if (TREE_CODE (type) == REFERENCE_TYPE)
5471 init = grok_reference_init (decl, type, init, cleanup);
5472 else if (init || type_build_ctor_call (type))
5475 check_for_uninitialized_const_var (decl);
5476 /* Do not reshape constructors of vectors (they don't need to be
5478 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5480 if (is_std_init_list (type))
5481 init = build_init_list_var_init (decl, type, init,
5482 &extra_init, cleanup);
5483 else if (TYPE_NON_AGGREGATE_CLASS (type))
5485 /* Don't reshape if the class has constructors. */
5486 if (cxx_dialect == cxx98)
5487 error ("in C++98 %qD must be initialized by constructor, "
5491 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5493 error ("opaque vector types cannot be initialized");
5494 init = error_mark_node;
5498 init = reshape_init (type, init, tf_warning_or_error);
5499 if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
5500 check_narrowing (type, init);
5504 /* If DECL has an array type without a specific bound, deduce the
5505 array size from the initializer. */
5506 maybe_deduce_size_from_array_init (decl, init);
5507 type = TREE_TYPE (decl);
5508 if (type == error_mark_node)
5511 if (type_build_ctor_call (type)
5512 || (CLASS_TYPE_P (type)
5513 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5515 init_code = build_aggr_init_full_exprs (decl, init, flags);
5517 /* If this is a constexpr initializer, expand_default_init will
5518 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5519 case, pull the initializer back out and pass it down into
5520 store_init_value. */
5521 while (TREE_CODE (init_code) == EXPR_STMT
5522 || TREE_CODE (init_code) == CONVERT_EXPR)
5523 init_code = TREE_OPERAND (init_code, 0);
5524 if (TREE_CODE (init_code) == INIT_EXPR)
5526 init = TREE_OPERAND (init_code, 1);
5527 init_code = NULL_TREE;
5528 /* Don't call digest_init; it's unnecessary and will complain
5529 about aggregate initialization of non-aggregate classes. */
5530 flags |= LOOKUP_ALREADY_DIGESTED;
5532 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5534 /* Declared constexpr, but no suitable initializer; massage
5535 init appropriately so we can pass it into store_init_value
5537 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5538 init = finish_compound_literal (type, init,
5539 tf_warning_or_error);
5540 else if (CLASS_TYPE_P (type)
5541 && (!init || TREE_CODE (init) == TREE_LIST))
5543 init = build_functional_cast (type, init, tf_none);
5544 if (init != error_mark_node)
5545 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5547 init_code = NULL_TREE;
5553 if (init && TREE_CODE (init) != TREE_VEC)
5555 init_code = store_init_value (decl, init, flags);
5556 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5557 && DECL_INITIAL (decl)
5558 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5559 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5560 warning (0, "array %qD initialized by parenthesized string literal %qE",
5561 decl, DECL_INITIAL (decl));
5567 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5568 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5569 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5570 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5573 check_for_uninitialized_const_var (decl);
5576 if (init && init != error_mark_node)
5577 init_code = build2 (INIT_EXPR, type, decl, init);
5580 init_code = add_stmt_to_compound (extra_init, init_code);
5582 if (init_code && DECL_IN_AGGR_P (decl))
5584 static int explained = 0;
5586 if (cxx_dialect < cxx0x)
5587 error ("initializer invalid for static member with constructor");
5589 error ("non-constant in-class initialization invalid for static "
5590 "member %qD", decl);
5593 error ("(an out of class initialization is required)");
5601 /* If DECL is not a local variable, give it RTL. */
5604 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5606 int toplev = toplevel_bindings_p ();
5608 const char *filename;
5610 /* Set the DECL_ASSEMBLER_NAME for the object. */
5613 /* The `register' keyword, when used together with an
5614 asm-specification, indicates that the variable should be
5615 placed in a particular register. */
5616 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5618 set_user_assembler_name (decl, asmspec);
5619 DECL_HARD_REGISTER (decl) = 1;
5623 if (TREE_CODE (decl) == FUNCTION_DECL
5624 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5625 set_builtin_user_assembler_name (decl, asmspec);
5626 set_user_assembler_name (decl, asmspec);
5630 /* Handle non-variables up front. */
5631 if (TREE_CODE (decl) != VAR_DECL)
5633 rest_of_decl_compilation (decl, toplev, at_eof);
5637 /* If we see a class member here, it should be a static data
5639 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5641 gcc_assert (TREE_STATIC (decl));
5642 /* An in-class declaration of a static data member should be
5643 external; it is only a declaration, and not a definition. */
5644 if (init == NULL_TREE)
5645 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5648 /* We don't create any RTL for local variables. */
5649 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5652 /* We defer emission of local statics until the corresponding
5653 DECL_EXPR is expanded. */
5654 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5656 /* We try to defer namespace-scope static constants so that they are
5657 not emitted into the object file unnecessarily. */
5658 filename = input_filename;
5659 if (!DECL_VIRTUAL_P (decl)
5660 && TREE_READONLY (decl)
5661 && DECL_INITIAL (decl) != NULL_TREE
5662 && DECL_INITIAL (decl) != error_mark_node
5664 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5666 && !TREE_PUBLIC (decl))
5668 /* Fool with the linkage of static consts according to #pragma
5670 struct c_fileinfo *finfo = get_fileinfo (filename);
5671 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5673 TREE_PUBLIC (decl) = 1;
5674 DECL_EXTERNAL (decl) = finfo->interface_only;
5679 /* Likewise for template instantiations. */
5680 else if (DECL_LANG_SPECIFIC (decl)
5681 && DECL_IMPLICIT_INSTANTIATION (decl))
5684 /* If we're not deferring, go ahead and assemble the variable. */
5686 rest_of_decl_compilation (decl, toplev, at_eof);
5689 /* walk_tree helper for wrap_temporary_cleanups, below. */
5692 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5694 if (TYPE_P (*stmt_p))
5700 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5702 tree guard = (tree)data;
5703 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5705 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5706 /* Tell honor_protect_cleanup_actions to handle this as a separate
5708 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5710 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5716 /* We're initializing a local variable which has a cleanup GUARD. If there
5717 are any temporaries used in the initializer INIT of this variable, we
5718 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5719 variable will be cleaned up properly if one of them throws.
5721 Unfortunately, there's no way to express this properly in terms of
5722 nesting, as the regions for the temporaries overlap the region for the
5723 variable itself; if there are two temporaries, the variable needs to be
5724 the first thing destroyed if either of them throws. However, we only
5725 want to run the variable's cleanup if it actually got constructed. So
5726 we need to guard the temporary cleanups with the variable's cleanup if
5727 they are run on the normal path, but not if they are run on the
5728 exceptional path. We implement this by telling
5729 honor_protect_cleanup_actions to strip the variable cleanup from the
5730 exceptional path. */
5733 wrap_temporary_cleanups (tree init, tree guard)
5735 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5738 /* Generate code to initialize DECL (a local variable). */
5741 initialize_local_var (tree decl, tree init)
5743 tree type = TREE_TYPE (decl);
5747 gcc_assert (TREE_CODE (decl) == VAR_DECL
5748 || TREE_CODE (decl) == RESULT_DECL);
5749 gcc_assert (!TREE_STATIC (decl));
5751 if (DECL_SIZE (decl) == NULL_TREE)
5753 /* If we used it already as memory, it must stay in memory. */
5754 DECL_INITIAL (decl) = NULL_TREE;
5755 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5759 if (type == error_mark_node)
5762 /* Compute and store the initial value. */
5763 already_used = TREE_USED (decl) || TREE_USED (type);
5764 if (TREE_USED (type))
5765 DECL_READ_P (decl) = 1;
5767 /* Generate a cleanup, if necessary. */
5768 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5770 /* Perform the initialization. */
5773 if (TREE_CODE (init) == INIT_EXPR
5774 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5776 /* Stick simple initializers in DECL_INITIAL so that
5777 -Wno-init-self works (c++/34772). */
5778 gcc_assert (TREE_OPERAND (init, 0) == decl);
5779 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5783 int saved_stmts_are_full_exprs_p;
5785 /* If we're only initializing a single object, guard the
5786 destructors of any temporaries used in its initializer with
5787 its destructor. This isn't right for arrays because each
5788 element initialization is a full-expression. */
5789 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5790 wrap_temporary_cleanups (init, cleanup);
5792 gcc_assert (building_stmt_list_p ());
5793 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5794 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5795 finish_expr_stmt (init);
5796 current_stmt_tree ()->stmts_are_full_exprs_p =
5797 saved_stmts_are_full_exprs_p;
5801 /* Set this to 0 so we can tell whether an aggregate which was
5802 initialized was ever used. Don't do this if it has a
5803 destructor, so we don't complain about the 'resource
5804 allocation is initialization' idiom. Now set
5805 attribute((unused)) on types so decls of that type will be
5806 marked used. (see TREE_USED, above.) */
5807 if (TYPE_NEEDS_CONSTRUCTING (type)
5809 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5810 && DECL_NAME (decl))
5811 TREE_USED (decl) = 0;
5812 else if (already_used)
5813 TREE_USED (decl) = 1;
5816 finish_decl_cleanup (decl, cleanup);
5819 /* DECL is a VAR_DECL for a compiler-generated variable with static
5820 storage duration (like a virtual table) whose initializer is a
5821 compile-time constant. Initialize the variable and provide it to the
5825 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5828 gcc_assert (DECL_ARTIFICIAL (decl));
5829 init = build_constructor (TREE_TYPE (decl), v);
5830 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5831 DECL_INITIAL (decl) = init;
5832 DECL_INITIALIZED_P (decl) = 1;
5833 determine_visibility (decl);
5834 layout_var_decl (decl);
5835 maybe_commonize_var (decl);
5836 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5839 /* INIT is the initializer for a variable, as represented by the
5840 parser. Returns true iff INIT is type-dependent. */
5843 type_dependent_init_p (tree init)
5845 if (TREE_CODE (init) == TREE_LIST)
5846 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5847 return any_type_dependent_elements_p (init);
5848 else if (TREE_CODE (init) == CONSTRUCTOR)
5849 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5851 VEC(constructor_elt, gc) *elts;
5855 elts = CONSTRUCTOR_ELTS (init);
5856 nelts = VEC_length (constructor_elt, elts);
5857 for (i = 0; i < nelts; ++i)
5858 if (type_dependent_init_p (VEC_index (constructor_elt,
5863 /* It must be a simple expression, e.g., int i = 3; */
5864 return type_dependent_expression_p (init);
5869 /* INIT is the initializer for a variable, as represented by the
5870 parser. Returns true iff INIT is value-dependent. */
5873 value_dependent_init_p (tree init)
5875 if (TREE_CODE (init) == TREE_LIST)
5876 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5877 return any_value_dependent_elements_p (init);
5878 else if (TREE_CODE (init) == CONSTRUCTOR)
5879 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5881 VEC(constructor_elt, gc) *elts;
5885 elts = CONSTRUCTOR_ELTS (init);
5886 nelts = VEC_length (constructor_elt, elts);
5887 for (i = 0; i < nelts; ++i)
5888 if (value_dependent_init_p (VEC_index (constructor_elt,
5893 /* It must be a simple expression, e.g., int i = 3; */
5894 return value_dependent_expression_p (init);
5899 /* Finish processing of a declaration;
5900 install its line number and initial value.
5901 If the length of an array type is not known before,
5902 it must be determined now, from the initial value, or it is an error.
5904 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5905 true, then INIT is an integral constant expression.
5907 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5908 if the (init) syntax was used. */
5911 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5912 tree asmspec_tree, int flags)
5916 const char *asmspec = NULL;
5917 int was_readonly = 0;
5918 bool var_definition_p = false;
5921 if (decl == error_mark_node)
5926 error ("assignment (not initialization) in declaration");
5930 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5931 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5932 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5934 type = TREE_TYPE (decl);
5935 if (type == error_mark_node)
5938 /* Assume no cleanup is required. */
5939 cleanup = NULL_TREE;
5941 /* If a name was specified, get the string. */
5942 if (at_namespace_scope_p ())
5943 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5944 if (asmspec_tree && asmspec_tree != error_mark_node)
5945 asmspec = TREE_STRING_POINTER (asmspec_tree);
5947 if (current_class_type
5948 && CP_DECL_CONTEXT (decl) == current_class_type
5949 && TYPE_BEING_DEFINED (current_class_type)
5950 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5951 && (DECL_INITIAL (decl) || init))
5952 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5954 auto_node = type_uses_auto (type);
5958 if (init == NULL_TREE)
5960 error ("declaration of %q#D has no initializer", decl);
5961 TREE_TYPE (decl) = error_mark_node;
5965 if (TREE_CODE (d_init) == TREE_LIST)
5966 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5967 tf_warning_or_error);
5968 d_init = resolve_nondeduced_context (d_init);
5969 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5971 if (type == error_mark_node)
5975 if (!ensure_literal_type_for_constexpr_object (decl))
5976 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5978 if (TREE_CODE (decl) == VAR_DECL
5979 && DECL_CLASS_SCOPE_P (decl)
5980 && DECL_INITIALIZED_IN_CLASS_P (decl))
5981 check_static_variable_definition (decl, type);
5983 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5986 if (init == ridpointers[(int)RID_DELETE])
5988 /* FIXME check this is 1st decl. */
5989 DECL_DELETED_FN (decl) = 1;
5990 DECL_DECLARED_INLINE_P (decl) = 1;
5991 DECL_INITIAL (decl) = error_mark_node;
5992 FOR_EACH_CLONE (clone, decl)
5994 DECL_DELETED_FN (clone) = 1;
5995 DECL_DECLARED_INLINE_P (clone) = 1;
5996 DECL_INITIAL (clone) = error_mark_node;
6000 else if (init == ridpointers[(int)RID_DEFAULT])
6002 if (defaultable_fn_check (decl))
6003 DECL_DEFAULTED_FN (decl) = 1;
6005 DECL_INITIAL (decl) = NULL_TREE;
6009 if (init && TREE_CODE (decl) == VAR_DECL)
6011 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6012 /* If DECL is a reference, then we want to know whether init is a
6013 reference constant; init_const_expr_p as passed tells us whether
6014 it's an rvalue constant. */
6015 if (TREE_CODE (type) == REFERENCE_TYPE)
6016 init_const_expr_p = potential_constant_expression (init);
6017 if (init_const_expr_p)
6019 /* Set these flags now for templates. We'll update the flags in
6020 store_init_value for instantiations. */
6021 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6022 if (decl_maybe_constant_var_p (decl))
6023 TREE_CONSTANT (decl) = 1;
6027 if (processing_template_decl)
6029 bool type_dependent_p;
6031 /* Add this declaration to the statement-tree. */
6032 if (at_function_scope_p ())
6033 add_decl_expr (decl);
6035 type_dependent_p = dependent_type_p (type);
6037 if (check_for_bare_parameter_packs (init))
6040 DECL_INITIAL (decl) = NULL_TREE;
6043 /* Generally, initializers in templates are expanded when the
6044 template is instantiated. But, if DECL is a variable constant
6045 then it can be used in future constant expressions, so its value
6046 must be available. */
6048 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6049 /* We can't do anything if the decl has dependent type. */;
6051 && init_const_expr_p
6052 && !type_dependent_p
6053 && decl_maybe_constant_var_p (decl)
6054 && !type_dependent_init_p (init)
6055 && !value_dependent_init_p (init))
6057 /* This variable seems to be a non-dependent constant, so process
6058 its initializer. If check_initializer returns non-null the
6059 initialization wasn't constant after all. */
6060 tree init_code = check_initializer (decl, init, flags, &cleanup);
6061 if (init_code == NULL_TREE)
6064 else if (!DECL_PRETTY_FUNCTION_P (decl))
6065 /* Deduce array size even if the initializer is dependent. */
6066 maybe_deduce_size_from_array_init (decl, init);
6069 DECL_INITIAL (decl) = init;
6073 /* Take care of TYPE_DECLs up front. */
6074 if (TREE_CODE (decl) == TYPE_DECL)
6076 if (type != error_mark_node
6077 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6079 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6080 warning (0, "shadowing previous type declaration of %q#D", decl);
6081 set_identifier_type_value (DECL_NAME (decl), decl);
6084 /* If we have installed this as the canonical typedef for this
6085 type, and that type has not been defined yet, delay emitting
6086 the debug information for it, as we will emit it later. */
6087 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6088 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6089 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6091 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6096 /* A reference will be modified here, as it is initialized. */
6097 if (! DECL_EXTERNAL (decl)
6098 && TREE_READONLY (decl)
6099 && TREE_CODE (type) == REFERENCE_TYPE)
6102 TREE_READONLY (decl) = 0;
6105 if (TREE_CODE (decl) == VAR_DECL)
6107 /* Only variables with trivial initialization and destruction can
6108 have thread-local storage. */
6109 if (DECL_THREAD_LOCAL_P (decl)
6110 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6111 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6112 error ("%qD cannot be thread-local because it has non-trivial "
6113 "type %qT", decl, TREE_TYPE (decl));
6114 /* If this is a local variable that will need a mangled name,
6115 register it now. We must do this before processing the
6116 initializer for the variable, since the initialization might
6117 require a guard variable, and since the mangled name of the
6118 guard variable will depend on the mangled name of this
6120 if (DECL_FUNCTION_SCOPE_P (decl)
6121 && TREE_STATIC (decl)
6122 && !DECL_ARTIFICIAL (decl))
6124 push_local_name (decl);
6125 if (DECL_CONSTRUCTOR_P (current_function_decl)
6126 || DECL_DESTRUCTOR_P (current_function_decl))
6127 /* Normally local_decls is populated during GIMPLE lowering,
6128 but [cd]tors are never actually compiled directly. We need
6129 to put statics on the list so we can deal with the label
6130 address extension. */
6131 add_local_decl (cfun, decl);
6134 /* Convert the initializer to the type of DECL, if we have not
6135 already initialized DECL. */
6136 if (!DECL_INITIALIZED_P (decl)
6137 /* If !DECL_EXTERNAL then DECL is being defined. In the
6138 case of a static data member initialized inside the
6139 class-specifier, there can be an initializer even if DECL
6140 is *not* defined. */
6141 && (!DECL_EXTERNAL (decl) || init))
6143 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6146 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6147 /* Allow libjava/prims.cc define primitive classes. */
6148 if (init != NULL_TREE
6149 || jclass == NULL_TREE
6150 || TREE_CODE (jclass) != TYPE_DECL
6151 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6152 || !same_type_ignoring_top_level_qualifiers_p
6153 (type, TREE_TYPE (TREE_TYPE (jclass))))
6154 error ("Java object %qD not allocated with %<new%>", decl);
6157 init = check_initializer (decl, init, flags, &cleanup);
6158 /* Thread-local storage cannot be dynamically initialized. */
6159 if (DECL_THREAD_LOCAL_P (decl) && init)
6161 error ("%qD is thread-local and so cannot be dynamically "
6162 "initialized", decl);
6166 /* Check that the initializer for a static data member was a
6167 constant. Although we check in the parser that the
6168 initializer is an integral constant expression, we do not
6169 simplify division-by-zero at the point at which it
6170 occurs. Therefore, in:
6172 struct S { static const int i = 7 / 0; };
6174 we issue an error at this point. It would
6175 probably be better to forbid division by zero in
6176 integral constant expressions. */
6177 if (DECL_EXTERNAL (decl) && init)
6179 error ("%qD cannot be initialized by a non-constant expression"
6180 " when being declared", decl);
6181 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6189 The memory occupied by any object of static storage
6190 duration is zero-initialized at program startup before
6191 any other initialization takes place.
6193 We cannot create an appropriate initializer until after
6194 the type of DECL is finalized. If DECL_INITIAL is set,
6195 then the DECL is statically initialized, and any
6196 necessary zero-initialization has already been performed. */
6197 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6198 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6199 /*nelts=*/NULL_TREE,
6200 /*static_storage_p=*/true);
6201 /* Remember that the initialization for this variable has
6203 DECL_INITIALIZED_P (decl) = 1;
6204 /* This declaration is the definition of this variable,
6205 unless we are initializing a static data member within
6206 the class specifier. */
6207 if (!DECL_EXTERNAL (decl))
6208 var_definition_p = true;
6210 /* If the variable has an array type, lay out the type, even if
6211 there is no initializer. It is valid to index through the
6212 array, and we must get TYPE_ALIGN set correctly on the array
6214 else if (TREE_CODE (type) == ARRAY_TYPE)
6217 if (TREE_STATIC (decl)
6218 && !at_function_scope_p ()
6219 && current_function_decl == NULL)
6220 /* So decl is a global variable or a static member of a
6221 non local class. Record the types it uses
6222 so that we can decide later to emit debug info for them. */
6223 record_types_used_by_current_var_decl (decl);
6225 else if (TREE_CODE (decl) == FIELD_DECL
6226 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6227 error ("non-static data member %qD has Java class type", decl);
6229 /* Add this declaration to the statement-tree. This needs to happen
6230 after the call to check_initializer so that the DECL_EXPR for a
6231 reference temp is added before the DECL_EXPR for the reference itself. */
6232 if (DECL_FUNCTION_SCOPE_P (decl))
6233 add_decl_expr (decl);
6235 /* Let the middle end know about variables and functions -- but not
6236 static data members in uninstantiated class templates. */
6237 if (TREE_CODE (decl) == VAR_DECL
6238 || TREE_CODE (decl) == FUNCTION_DECL)
6240 if (TREE_CODE (decl) == VAR_DECL)
6242 layout_var_decl (decl);
6243 maybe_commonize_var (decl);
6246 /* This needs to happen after the linkage is set. */
6247 determine_visibility (decl);
6249 if (var_definition_p && TREE_STATIC (decl))
6251 /* If a TREE_READONLY variable needs initialization
6252 at runtime, it is no longer readonly and we need to
6253 avoid MEM_READONLY_P being set on RTL created for it. */
6256 if (TREE_READONLY (decl))
6257 TREE_READONLY (decl) = 0;
6260 else if (was_readonly)
6261 TREE_READONLY (decl) = 1;
6264 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6266 /* Check for abstractness of the type. Notice that there is no
6267 need to strip array types here since the check for those types
6268 is already done within create_array_type_for_decl. */
6269 if (TREE_CODE (type) == FUNCTION_TYPE
6270 || TREE_CODE (type) == METHOD_TYPE)
6271 abstract_virtuals_error (decl, TREE_TYPE (type));
6273 abstract_virtuals_error (decl, type);
6275 if (TREE_TYPE (decl) == error_mark_node)
6276 /* No initialization required. */
6278 else if (TREE_CODE (decl) == FUNCTION_DECL)
6282 if (init == ridpointers[(int)RID_DEFAULT])
6284 /* An out-of-class default definition is defined at
6285 the point where it is explicitly defaulted. */
6286 if (DECL_DELETED_FN (decl))
6287 maybe_explain_implicit_delete (decl);
6288 else if (DECL_INITIAL (decl) == error_mark_node)
6289 synthesize_method (decl);
6292 error ("function %q#D is initialized like a variable", decl);
6294 /* else no initialization required. */
6296 else if (DECL_EXTERNAL (decl)
6297 && ! (DECL_LANG_SPECIFIC (decl)
6298 && DECL_NOT_REALLY_EXTERN (decl)))
6301 DECL_INITIAL (decl) = init;
6303 /* A variable definition. */
6304 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6305 /* Initialize the local variable. */
6306 initialize_local_var (decl, init);
6308 /* If a variable is defined, and then a subsequent
6309 definition with external linkage is encountered, we will
6310 get here twice for the same variable. We want to avoid
6311 calling expand_static_init more than once. For variables
6312 that are not static data members, we can call
6313 expand_static_init only when we actually process the
6314 initializer. It is not legal to redeclare a static data
6315 member, so this issue does not arise in that case. */
6316 else if (var_definition_p && TREE_STATIC (decl))
6317 expand_static_init (decl, init);
6320 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6321 reference, insert it in the statement-tree now. */
6323 push_cleanup (decl, cleanup, false);
6326 TREE_READONLY (decl) = 1;
6328 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6331 /* Returns a declaration for a VAR_DECL as if:
6333 extern "C" TYPE NAME;
6335 had been seen. Used to create compiler-generated global
6339 declare_global_var (tree name, tree type)
6343 push_to_top_level ();
6344 decl = build_decl (input_location, VAR_DECL, name, type);
6345 TREE_PUBLIC (decl) = 1;
6346 DECL_EXTERNAL (decl) = 1;
6347 DECL_ARTIFICIAL (decl) = 1;
6348 /* If the user has explicitly declared this variable (perhaps
6349 because the code we are compiling is part of a low-level runtime
6350 library), then it is possible that our declaration will be merged
6351 with theirs by pushdecl. */
6352 decl = pushdecl (decl);
6353 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6354 pop_from_top_level ();
6359 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6360 if "__cxa_atexit" is not being used) corresponding to the function
6361 to be called when the program exits. */
6364 get_atexit_fn_ptr_type (void)
6368 if (!atexit_fn_ptr_type_node)
6371 if (flag_use_cxa_atexit
6372 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6373 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6374 arg_type = ptr_type_node;
6376 /* The parameter to "atexit" is "void (*)(void)". */
6377 arg_type = NULL_TREE;
6379 fn_type = build_function_type_list (void_type_node,
6380 arg_type, NULL_TREE);
6381 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6384 return atexit_fn_ptr_type_node;
6387 /* Returns a pointer to the `atexit' function. Note that if
6388 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6389 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6392 get_atexit_node (void)
6398 bool use_aeabi_atexit;
6403 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6405 /* The declaration for `__cxa_atexit' is:
6407 int __cxa_atexit (void (*)(void *), void *, void *)
6409 We build up the argument types and then the function type
6411 tree argtype0, argtype1, argtype2;
6413 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6414 /* First, build the pointer-to-function type for the first
6416 fn_ptr_type = get_atexit_fn_ptr_type ();
6417 /* Then, build the rest of the argument types. */
6418 argtype2 = ptr_type_node;
6419 if (use_aeabi_atexit)
6421 argtype1 = fn_ptr_type;
6422 argtype0 = ptr_type_node;
6426 argtype1 = ptr_type_node;
6427 argtype0 = fn_ptr_type;
6429 /* And the final __cxa_atexit type. */
6430 fn_type = build_function_type_list (integer_type_node,
6431 argtype0, argtype1, argtype2,
6433 fn_ptr_type = build_pointer_type (fn_type);
6434 if (use_aeabi_atexit)
6435 name = "__aeabi_atexit";
6437 name = "__cxa_atexit";
6441 /* The declaration for `atexit' is:
6443 int atexit (void (*)());
6445 We build up the argument types and then the function type
6447 fn_ptr_type = get_atexit_fn_ptr_type ();
6448 /* Build the final atexit type. */
6449 fn_type = build_function_type_list (integer_type_node,
6450 fn_ptr_type, NULL_TREE);
6454 /* Now, build the function declaration. */
6455 push_lang_context (lang_name_c);
6456 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6457 mark_used (atexit_fndecl);
6458 pop_lang_context ();
6459 atexit_node = decay_conversion (atexit_fndecl);
6464 /* Returns the __dso_handle VAR_DECL. */
6467 get_dso_handle_node (void)
6469 if (dso_handle_node)
6470 return dso_handle_node;
6472 /* Declare the variable. */
6473 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6476 #ifdef HAVE_GAS_HIDDEN
6477 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6478 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6481 return dso_handle_node;
6484 /* Begin a new function with internal linkage whose job will be simply
6485 to destroy some particular variable. */
6487 static GTY(()) int start_cleanup_cnt;
6490 start_cleanup_fn (void)
6495 bool use_cxa_atexit = flag_use_cxa_atexit
6496 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6498 push_to_top_level ();
6500 /* No need to mangle this. */
6501 push_lang_context (lang_name_c);
6503 /* Build the name of the function. */
6504 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6505 /* Build the function declaration. */
6506 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6507 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6508 /* It's a function with internal linkage, generated by the
6510 TREE_PUBLIC (fndecl) = 0;
6511 DECL_ARTIFICIAL (fndecl) = 1;
6512 /* Make the function `inline' so that it is only emitted if it is
6513 actually needed. It is unlikely that it will be inlined, since
6514 it is only called via a function pointer, but we avoid unnecessary
6515 emissions this way. */
6516 DECL_DECLARED_INLINE_P (fndecl) = 1;
6517 DECL_INTERFACE_KNOWN (fndecl) = 1;
6518 /* Build the parameter. */
6523 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6524 DECL_CONTEXT (parmdecl) = fndecl;
6525 TREE_USED (parmdecl) = 1;
6526 DECL_READ_P (parmdecl) = 1;
6527 DECL_ARGUMENTS (fndecl) = parmdecl;
6531 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6533 pop_lang_context ();
6535 return current_function_decl;
6538 /* Finish the cleanup function begun by start_cleanup_fn. */
6541 end_cleanup_fn (void)
6543 expand_or_defer_fn (finish_function (0));
6545 pop_from_top_level ();
6548 /* Generate code to handle the destruction of DECL, an object with
6549 static storage duration. */
6552 register_dtor_fn (tree decl)
6559 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6561 type = TREE_TYPE (decl);
6562 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6563 return void_zero_node;
6565 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6566 a class object, we can just pass the destructor to
6567 "__cxa_atexit"; we don't have to build a temporary function to do
6569 use_dtor = (flag_use_cxa_atexit
6570 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6571 && CLASS_TYPE_P (type));
6576 /* Find the destructor. */
6577 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6578 gcc_assert (idx >= 0);
6579 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6580 /* Make sure it is accessible. */
6581 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6585 /* Call build_cleanup before we enter the anonymous function so
6586 that any access checks will be done relative to the current
6587 scope, rather than the scope of the anonymous function. */
6588 build_cleanup (decl);
6590 /* Now start the function. */
6591 cleanup = start_cleanup_fn ();
6593 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6594 to the original function, rather than the anonymous one. That
6595 will make the back end think that nested functions are in use,
6596 which causes confusion. */
6597 push_deferring_access_checks (dk_no_check);
6598 fcall = build_cleanup (decl);
6599 pop_deferring_access_checks ();
6601 /* Create the body of the anonymous function. */
6602 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6603 finish_expr_stmt (fcall);
6604 finish_compound_stmt (compound_stmt);
6608 /* Call atexit with the cleanup function. */
6609 mark_used (cleanup);
6610 cleanup = build_address (cleanup);
6611 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6617 /* We must convert CLEANUP to the type that "__cxa_atexit"
6619 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6620 /* "__cxa_atexit" will pass the address of DECL to the
6621 cleanup function. */
6623 addr = build_address (decl);
6624 /* The declared type of the parameter to "__cxa_atexit" is
6625 "void *". For plain "T*", we could just let the
6626 machinery in cp_build_function_call convert it -- but if the
6627 type is "cv-qualified T *", then we need to convert it
6628 before passing it in, to avoid spurious errors. */
6629 addr = build_nop (ptr_type_node, addr);
6632 /* Since the cleanup functions we build ignore the address
6633 they're given, there's no reason to pass the actual address
6634 in, and, in general, it's cheaper to pass NULL than any
6636 addr = null_pointer_node;
6637 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6638 tf_warning_or_error);
6639 if (targetm.cxx.use_aeabi_atexit ())
6652 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6653 arg0, arg1, arg2, NULL_TREE);
6656 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6657 is its initializer. Generate code to handle the construction
6658 and destruction of DECL. */
6661 expand_static_init (tree decl, tree init)
6663 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6664 gcc_assert (TREE_STATIC (decl));
6666 /* Some variables require no dynamic initialization. */
6668 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6671 if (DECL_FUNCTION_SCOPE_P (decl))
6673 /* Emit code to perform this initialization but once. */
6674 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6675 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6676 tree guard, guard_addr;
6679 /* Emit code to perform this initialization but once. This code
6682 static <type> guard;
6683 if (!guard.first_byte) {
6684 if (__cxa_guard_acquire (&guard)) {
6687 // Do initialization.
6688 flag = true; __cxa_guard_release (&guard);
6689 // Register variable for destruction at end of program.
6691 if (!flag) __cxa_guard_abort (&guard);
6695 Note that the `flag' variable is only set to 1 *after* the
6696 initialization is complete. This ensures that an exception,
6697 thrown during the construction, will cause the variable to
6698 reinitialized when we pass through this code again, as per:
6702 If the initialization exits by throwing an exception, the
6703 initialization is not complete, so it will be tried again
6704 the next time control enters the declaration.
6706 This process should be thread-safe, too; multiple threads
6707 should not be able to initialize the variable more than
6710 /* Create the guard variable. */
6711 guard = get_guard (decl);
6713 /* This optimization isn't safe on targets with relaxed memory
6714 consistency. On such targets we force synchronization in
6715 __cxa_guard_acquire. */
6716 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6718 /* Begin the conditional initialization. */
6719 if_stmt = begin_if_stmt ();
6720 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6721 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6724 if (flag_threadsafe_statics)
6726 tree vfntype = NULL_TREE;
6727 tree acquire_name, release_name, abort_name;
6728 tree acquire_fn, release_fn, abort_fn;
6729 guard_addr = build_address (guard);
6731 acquire_name = get_identifier ("__cxa_guard_acquire");
6732 release_name = get_identifier ("__cxa_guard_release");
6733 abort_name = get_identifier ("__cxa_guard_abort");
6734 acquire_fn = identifier_global_value (acquire_name);
6735 release_fn = identifier_global_value (release_name);
6736 abort_fn = identifier_global_value (abort_name);
6738 acquire_fn = push_library_fn
6739 (acquire_name, build_function_type_list (integer_type_node,
6740 TREE_TYPE (guard_addr),
6743 if (!release_fn || !abort_fn)
6744 vfntype = build_function_type_list (void_type_node,
6745 TREE_TYPE (guard_addr),
6748 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6750 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6752 inner_if_stmt = begin_if_stmt ();
6753 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6756 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6757 begin = get_target_expr (boolean_false_node);
6758 flag = TARGET_EXPR_SLOT (begin);
6760 TARGET_EXPR_CLEANUP (begin)
6761 = build3 (COND_EXPR, void_type_node, flag,
6763 build_call_n (abort_fn, 1, guard_addr));
6764 CLEANUP_EH_ONLY (begin) = 1;
6766 /* Do the initialization itself. */
6767 init = add_stmt_to_compound (begin, init);
6768 init = add_stmt_to_compound
6769 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6770 init = add_stmt_to_compound
6771 (init, build_call_n (release_fn, 1, guard_addr));
6774 init = add_stmt_to_compound (init, set_guard (guard));
6776 /* Use atexit to register a function for destroying this static
6778 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6780 finish_expr_stmt (init);
6782 if (flag_threadsafe_statics)
6784 finish_compound_stmt (inner_then_clause);
6785 finish_then_clause (inner_if_stmt);
6786 finish_if_stmt (inner_if_stmt);
6789 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6791 finish_compound_stmt (then_clause);
6792 finish_then_clause (if_stmt);
6793 finish_if_stmt (if_stmt);
6797 static_aggregates = tree_cons (init, decl, static_aggregates);
6801 /* Make TYPE a complete type based on INITIAL_VALUE.
6802 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6803 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6804 3 if the initializer list is empty (in pedantic mode). */
6807 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6810 tree type, elt_type;
6814 unsigned HOST_WIDE_INT i;
6817 /* An array of character type can be initialized from a
6818 brace-enclosed string constant.
6820 FIXME: this code is duplicated from reshape_init. Probably
6821 we should just call reshape_init here? */
6822 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6823 && TREE_CODE (initial_value) == CONSTRUCTOR
6824 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6826 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6827 tree value = VEC_index (constructor_elt, v, 0)->value;
6829 if (TREE_CODE (value) == STRING_CST
6830 && VEC_length (constructor_elt, v) == 1)
6831 initial_value = value;
6834 /* If any of the elements are parameter packs, we can't actually
6835 complete this type now because the array size is dependent. */
6836 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6838 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6841 if (PACK_EXPANSION_P (value))
6847 failure = complete_array_type (ptype, initial_value, do_default);
6849 /* We can create the array before the element type is complete, which
6850 means that we didn't have these two bits set in the original type
6851 either. In completing the type, we are expected to propagate these
6852 bits. See also complete_type which does the same thing for arrays
6855 if (TYPE_DOMAIN (type))
6857 elt_type = TREE_TYPE (type);
6858 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6859 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6860 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6866 /* As above, but either give an error or reject zero-size arrays, depending
6870 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6871 bool do_default, tsubst_flags_t complain)
6874 bool sfinae = !(complain & tf_error);
6875 /* In SFINAE context we can't be lenient about zero-size arrays. */
6878 failure = cp_complete_array_type (ptype, initial_value, do_default);
6884 /* Not an error. */;
6885 else if (failure == 1)
6886 error ("initializer fails to determine size of %qT", *ptype);
6887 else if (failure == 2)
6890 error ("array size missing in %qT", *ptype);
6892 else if (failure == 3)
6893 error ("zero-size array %qT", *ptype);
6894 *ptype = error_mark_node;
6899 /* Return zero if something is declared to be a member of type
6900 CTYPE when in the context of CUR_TYPE. STRING is the error
6901 message to print in that case. Otherwise, quietly return 1. */
6904 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6906 if (ctype && ctype != cur_type)
6908 if (flags == DTOR_FLAG)
6909 error ("destructor for alien class %qT cannot be a member", ctype);
6911 error ("constructor for alien class %qT cannot be a member", ctype);
6917 /* Subroutine of `grokdeclarator'. */
6919 /* Generate errors possibly applicable for a given set of specifiers.
6920 This is for ARM $7.1.2. */
6923 bad_specifiers (tree object,
6924 enum bad_spec_place type,
6935 error ("%qD declared as a %<virtual%> variable", object);
6937 error ("%qD declared as an %<inline%> variable", object);
6939 error ("%<const%> and %<volatile%> function specifiers on "
6940 "%qD invalid in variable declaration", object);
6944 error ("%qD declared as a %<virtual%> parameter", object);
6946 error ("%qD declared as an %<inline%> parameter", object);
6948 error ("%<const%> and %<volatile%> function specifiers on "
6949 "%qD invalid in parameter declaration", object);
6953 error ("%qD declared as a %<virtual%> type", object);
6955 error ("%qD declared as an %<inline%> type", object);
6957 error ("%<const%> and %<volatile%> function specifiers on "
6958 "%qD invalid in type declaration", object);
6962 error ("%qD declared as a %<virtual%> field", object);
6964 error ("%qD declared as an %<inline%> field", object);
6966 error ("%<const%> and %<volatile%> function specifiers on "
6967 "%qD invalid in field declaration", object);
6973 error ("%q+D declared as a friend", object);
6975 && (TREE_CODE (object) == TYPE_DECL
6976 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6977 && !TYPE_REFFN_P (TREE_TYPE (object))
6978 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6979 error ("%q+D declared with an exception specification", object);
6982 /* DECL is a member function or static data member and is presently
6983 being defined. Check that the definition is taking place in a
6987 check_class_member_definition_namespace (tree decl)
6989 /* These checks only apply to member functions and static data
6991 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6992 || TREE_CODE (decl) == VAR_DECL);
6993 /* We check for problems with specializations in pt.c in
6994 check_specialization_namespace, where we can issue better
6996 if (processing_specialization)
6998 /* There are no restrictions on the placement of
6999 explicit instantiations. */
7000 if (processing_explicit_instantiation)
7004 A member function definition that appears outside of the
7005 class definition shall appear in a namespace scope enclosing
7006 the class definition.
7010 The definition for a static data member shall appear in a
7011 namespace scope enclosing the member's class definition. */
7012 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7013 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7014 decl, DECL_CONTEXT (decl));
7017 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7018 METHOD_TYPE for a non-static member function; QUALS are the
7019 cv-qualifiers that apply to the function. */
7022 build_this_parm (tree type, cp_cv_quals quals)
7027 cp_cv_quals this_quals;
7029 if (CLASS_TYPE_P (type))
7032 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7033 this_type = build_pointer_type (this_type);
7036 this_type = type_of_this_parm (type);
7037 /* The `this' parameter is implicitly `const'; it cannot be
7039 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7040 qual_type = cp_build_qualified_type (this_type, this_quals);
7041 parm = build_artificial_parm (this_identifier, qual_type);
7042 cp_apply_type_quals_to_decl (this_quals, parm);
7046 /* DECL is a static member function. Complain if it was declared
7047 with function-cv-quals. */
7050 check_static_quals (tree decl, cp_cv_quals quals)
7052 if (quals != TYPE_UNQUALIFIED)
7053 error ("static member function %q#D declared with type qualifiers",
7057 /* CTYPE is class type, or null if non-class.
7058 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7060 DECLARATOR is the function's name.
7061 PARMS is a chain of PARM_DECLs for the function.
7062 VIRTUALP is truthvalue of whether the function is virtual or not.
7063 FLAGS are to be passed through to `grokclassfn'.
7064 QUALS are qualifiers indicating whether the function is `const'
7066 RAISES is a list of exceptions that this function can raise.
7067 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7068 not look, and -1 if we should not call `grokclassfn' at all.
7070 SFK is the kind of special function (if any) for the new function.
7072 Returns `NULL_TREE' if something goes wrong, after issuing
7073 applicable error messages. */
7076 grokfndecl (tree ctype,
7080 tree orig_declarator,
7082 enum overload_flags flags,
7089 special_function_kind sfk,
7094 location_t location)
7097 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7101 type = build_exception_variant (type, raises);
7103 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7105 /* If we have an explicit location, use it, otherwise use whatever
7106 build_lang_decl used (probably input_location). */
7107 if (location != UNKNOWN_LOCATION)
7108 DECL_SOURCE_LOCATION (decl) = location;
7110 if (TREE_CODE (type) == METHOD_TYPE)
7113 parm = build_this_parm (type, quals);
7114 DECL_CHAIN (parm) = parms;
7117 DECL_ARGUMENTS (decl) = parms;
7118 for (t = parms; t; t = DECL_CHAIN (t))
7119 DECL_CONTEXT (t) = decl;
7120 /* Propagate volatile out from type to decl. */
7121 if (TYPE_VOLATILE (type))
7122 TREE_THIS_VOLATILE (decl) = 1;
7124 /* Setup decl according to sfk. */
7127 case sfk_constructor:
7128 case sfk_copy_constructor:
7129 case sfk_move_constructor:
7130 DECL_CONSTRUCTOR_P (decl) = 1;
7132 case sfk_destructor:
7133 DECL_DESTRUCTOR_P (decl) = 1;
7139 /* If pointers to member functions use the least significant bit to
7140 indicate whether a function is virtual, ensure a pointer
7141 to this function will have that bit clear. */
7142 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7143 && TREE_CODE (type) == METHOD_TYPE
7144 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7145 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7148 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7152 ("defining explicit specialization %qD in friend declaration",
7156 tree fns = TREE_OPERAND (orig_declarator, 0);
7157 tree args = TREE_OPERAND (orig_declarator, 1);
7159 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7161 /* Something like `template <class T> friend void f<T>()'. */
7162 error ("invalid use of template-id %qD in declaration "
7163 "of primary template",
7169 /* A friend declaration of the form friend void f<>(). Record
7170 the information in the TEMPLATE_ID_EXPR. */
7171 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7173 if (TREE_CODE (fns) == COMPONENT_REF)
7175 /* Due to bison parser ickiness, we will have already looked
7176 up an operator_name or PFUNCNAME within the current class
7177 (see template_id in parse.y). If the current class contains
7178 such a name, we'll get a COMPONENT_REF here. Undo that. */
7180 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7181 == current_class_type);
7182 fns = TREE_OPERAND (fns, 1);
7184 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7185 || TREE_CODE (fns) == OVERLOAD);
7186 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7188 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7189 if (TREE_PURPOSE (t)
7190 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7192 error ("default arguments are not allowed in declaration "
7193 "of friend template specialization %qD",
7200 error ("%<inline%> is not allowed in declaration of friend "
7201 "template specialization %qD",
7208 /* If this decl has namespace scope, set that up. */
7210 set_decl_namespace (decl, in_namespace, friendp);
7212 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7214 /* `main' and builtins have implicit 'C' linkage. */
7215 if ((MAIN_NAME_P (declarator)
7216 || (IDENTIFIER_LENGTH (declarator) > 10
7217 && IDENTIFIER_POINTER (declarator)[0] == '_'
7218 && IDENTIFIER_POINTER (declarator)[1] == '_'
7219 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7220 && current_lang_name == lang_name_cplusplus
7221 && ctype == NULL_TREE
7222 && DECL_FILE_SCOPE_P (decl))
7223 SET_DECL_LANGUAGE (decl, lang_c);
7225 /* Should probably propagate const out from type to decl I bet (mrs). */
7228 DECL_STATIC_FUNCTION_P (decl) = 1;
7229 DECL_CONTEXT (decl) = ctype;
7234 DECL_CONTEXT (decl) = ctype;
7236 check_class_member_definition_namespace (decl);
7239 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7241 if (processing_template_decl)
7242 error ("cannot declare %<::main%> to be a template");
7244 error ("cannot declare %<::main%> to be inline");
7246 error ("cannot declare %<::main%> to be static");
7251 /* Members of anonymous types and local classes have no linkage; make
7252 them internal. If a typedef is made later, this will be changed. */
7253 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7254 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7257 if (publicp && cxx_dialect == cxx98)
7259 /* [basic.link]: A name with no linkage (notably, the name of a class
7260 or enumeration declared in a local scope) shall not be used to
7261 declare an entity with linkage.
7263 DR 757 relaxes this restriction for C++0x. */
7264 t = no_linkage_check (TREE_TYPE (decl),
7265 /*relaxed_p=*/false);
7268 if (TYPE_ANONYMOUS_P (t))
7270 if (DECL_EXTERN_C_P (decl))
7271 /* Allow this; it's pretty common in C. */;
7274 permerror (input_location, "anonymous type with no linkage "
7275 "used to declare function %q#D with linkage",
7277 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7278 permerror (input_location, "%q+#D does not refer to the unqualified "
7279 "type, so it is not used for linkage",
7284 permerror (input_location, "type %qT with no linkage used to "
7285 "declare function %q#D with linkage", t, decl);
7289 TREE_PUBLIC (decl) = publicp;
7292 DECL_INTERFACE_KNOWN (decl) = 1;
7293 DECL_NOT_REALLY_EXTERN (decl) = 1;
7296 /* If the declaration was declared inline, mark it as such. */
7298 DECL_DECLARED_INLINE_P (decl) = 1;
7300 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7302 DECL_EXTERNAL (decl) = 1;
7303 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7306 ? G_("static member function %qD cannot have cv-qualifier")
7307 : G_("non-member function %qD cannot have cv-qualifier"),
7309 quals = TYPE_UNQUALIFIED;
7312 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7313 && !grok_op_properties (decl, /*complain=*/true))
7317 /* Make the init_value nonzero so pushdecl knows this is not
7318 tentative. error_mark_node is replaced later with the BLOCK. */
7319 DECL_INITIAL (decl) = error_mark_node;
7321 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7322 TREE_NOTHROW (decl) = 1;
7324 /* Caller will do the rest of this. */
7328 if (ctype != NULL_TREE)
7329 grokclassfn (ctype, decl, flags);
7331 decl = check_explicit_specialization (orig_declarator, decl,
7334 4 * (friendp != 0));
7335 if (decl == error_mark_node)
7338 if (DECL_STATIC_FUNCTION_P (decl))
7339 check_static_quals (decl, quals);
7343 cplus_decl_attributes (&decl, *attrlist, 0);
7344 *attrlist = NULL_TREE;
7347 /* Check main's type after attributes have been applied. */
7348 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7350 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7353 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7355 error ("%<::main%> must return %<int%>");
7356 newtype = build_function_type (integer_type_node, oldtypeargs);
7357 TREE_TYPE (decl) = newtype;
7360 check_main_parameter_types (decl);
7363 if (ctype != NULL_TREE
7364 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7367 tree old_decl = check_classfn (ctype, decl,
7368 (processing_template_decl
7369 > template_class_depth (ctype))
7370 ? current_template_parms
7373 if (old_decl == error_mark_node)
7381 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7382 /* Because grokfndecl is always supposed to return a
7383 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7384 here. We depend on our callers to figure out that its
7385 really a template that's being returned. */
7386 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7388 if (DECL_STATIC_FUNCTION_P (old_decl)
7389 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7391 /* Remove the `this' parm added by grokclassfn. */
7392 revert_static_member_fn (decl);
7393 check_static_quals (decl, quals);
7395 if (DECL_ARTIFICIAL (old_decl))
7397 error ("definition of implicitly-declared %qD", old_decl);
7401 /* Since we've smashed OLD_DECL to its
7402 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7403 if (TREE_CODE (decl) == TEMPLATE_DECL)
7404 decl = DECL_TEMPLATE_RESULT (decl);
7406 /* Attempt to merge the declarations. This can fail, in
7407 the case of some invalid specialization declarations. */
7408 pushed_scope = push_scope (ctype);
7409 ok = duplicate_decls (decl, old_decl, friendp);
7411 pop_scope (pushed_scope);
7414 error ("no %q#D member function declared in class %qT",
7422 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7425 if (ctype == NULL_TREE || check)
7429 DECL_VIRTUAL_P (decl) = 1;
7434 /* decl is a FUNCTION_DECL.
7435 specifiers are the parsed virt-specifiers.
7437 Set flags to reflect the virt-specifiers.
7442 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7444 if (decl == NULL_TREE)
7446 if (specifiers & VIRT_SPEC_OVERRIDE)
7447 DECL_OVERRIDE_P (decl) = 1;
7448 if (specifiers & VIRT_SPEC_FINAL)
7449 DECL_FINAL_P (decl) = 1;
7453 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7454 the linkage that DECL will receive in the object file. */
7457 set_linkage_for_static_data_member (tree decl)
7459 /* A static data member always has static storage duration and
7460 external linkage. Note that static data members are forbidden in
7461 local classes -- the only situation in which a class has
7462 non-external linkage. */
7463 TREE_PUBLIC (decl) = 1;
7464 TREE_STATIC (decl) = 1;
7465 /* For non-template classes, static data members are always put
7466 out in exactly those files where they are defined, just as
7467 with ordinary namespace-scope variables. */
7468 if (!processing_template_decl)
7469 DECL_INTERFACE_KNOWN (decl) = 1;
7472 /* Create a VAR_DECL named NAME with the indicated TYPE.
7474 If SCOPE is non-NULL, it is the class type or namespace containing
7475 the variable. If SCOPE is NULL, the variable should is created in
7476 the innermost enclosings scope. */
7479 grokvardecl (tree type,
7481 const cp_decl_specifier_seq *declspecs,
7487 tree explicit_scope;
7489 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7491 /* Compute the scope in which to place the variable, but remember
7492 whether or not that scope was explicitly specified by the user. */
7493 explicit_scope = scope;
7496 /* An explicit "extern" specifier indicates a namespace-scope
7498 if (declspecs->storage_class == sc_extern)
7499 scope = current_decl_namespace ();
7500 else if (!at_function_scope_p ())
7501 scope = current_scope ();
7505 && (/* If the variable is a namespace-scope variable declared in a
7506 template, we need DECL_LANG_SPECIFIC. */
7507 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7508 /* Similarly for namespace-scope variables with language linkage
7510 || (TREE_CODE (scope) == NAMESPACE_DECL
7511 && current_lang_name != lang_name_cplusplus)
7512 /* Similarly for static data members. */
7514 decl = build_lang_decl (VAR_DECL, name, type);
7516 decl = build_decl (input_location, VAR_DECL, name, type);
7518 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7519 set_decl_namespace (decl, explicit_scope, 0);
7521 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7523 if (declspecs->storage_class == sc_extern)
7525 DECL_THIS_EXTERN (decl) = 1;
7526 DECL_EXTERNAL (decl) = !initialized;
7529 if (DECL_CLASS_SCOPE_P (decl))
7531 set_linkage_for_static_data_member (decl);
7532 /* This function is only called with out-of-class definitions. */
7533 DECL_EXTERNAL (decl) = 0;
7534 check_class_member_definition_namespace (decl);
7536 /* At top level, either `static' or no s.c. makes a definition
7537 (perhaps tentative), and absence of `static' makes it public. */
7538 else if (toplevel_bindings_p ())
7540 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7541 && (DECL_THIS_EXTERN (decl) || ! constp));
7542 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7544 /* Not at top level, only `static' makes a static definition. */
7547 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7548 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7551 if (declspecs->specs[(int)ds_thread])
7552 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7554 /* If the type of the decl has no linkage, make sure that we'll
7555 notice that in mark_used. */
7556 if (cxx_dialect > cxx98
7557 && decl_linkage (decl) != lk_none
7558 && DECL_LANG_SPECIFIC (decl) == NULL
7559 && !DECL_EXTERN_C_P (decl)
7560 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7561 retrofit_lang_decl (decl);
7563 if (TREE_PUBLIC (decl))
7565 /* [basic.link]: A name with no linkage (notably, the name of a class
7566 or enumeration declared in a local scope) shall not be used to
7567 declare an entity with linkage.
7569 DR 757 relaxes this restriction for C++0x. */
7570 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7571 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7574 if (TYPE_ANONYMOUS_P (t))
7576 if (DECL_EXTERN_C_P (decl))
7577 /* Allow this; it's pretty common in C. */
7581 /* DRs 132, 319 and 389 seem to indicate types with
7582 no linkage can only be used to declare extern "C"
7583 entities. Since it's not always an error in the
7584 ISO C++ 90 Standard, we only issue a warning. */
7585 warning (0, "anonymous type with no linkage used to declare "
7586 "variable %q#D with linkage", decl);
7587 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7588 warning (0, "%q+#D does not refer to the unqualified "
7589 "type, so it is not used for linkage",
7594 warning (0, "type %qT with no linkage used to declare variable "
7595 "%q#D with linkage", t, decl);
7599 DECL_INTERFACE_KNOWN (decl) = 1;
7604 /* Create and return a canonical pointer to member function type, for
7605 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7608 build_ptrmemfunc_type (tree type)
7612 tree unqualified_variant = NULL_TREE;
7614 if (type == error_mark_node)
7617 /* If a canonical type already exists for this type, use it. We use
7618 this method instead of type_hash_canon, because it only does a
7619 simple equality check on the list of field members. */
7621 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7624 /* Make sure that we always have the unqualified pointer-to-member
7626 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7628 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7630 t = make_class_type (RECORD_TYPE);
7631 xref_basetypes (t, NULL_TREE);
7633 /* Let the front end know this is a pointer to member function... */
7634 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7635 /* ... and not really a class type. */
7636 SET_CLASS_TYPE_P (t, 0);
7638 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7641 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7643 DECL_CHAIN (field) = fields;
7646 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7648 /* Zap out the name so that the back end will give us the debugging
7649 information for this anonymous RECORD_TYPE. */
7650 TYPE_NAME (t) = NULL_TREE;
7652 /* If this is not the unqualified form of this pointer-to-member
7653 type, set the TYPE_MAIN_VARIANT for this type to be the
7654 unqualified type. Since they are actually RECORD_TYPEs that are
7655 not variants of each other, we must do this manually.
7656 As we just built a new type there is no need to do yet another copy. */
7657 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7659 int type_quals = cp_type_quals (type);
7660 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7661 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7662 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7663 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7664 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7665 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7666 TREE_TYPE (TYPE_BINFO (t)) = t;
7669 /* Cache this pointer-to-member type so that we can find it again
7671 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7673 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7674 SET_TYPE_STRUCTURAL_EQUALITY (t);
7675 else if (TYPE_CANONICAL (type) != type)
7676 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7681 /* Create and return a pointer to data member type. */
7684 build_ptrmem_type (tree class_type, tree member_type)
7686 if (TREE_CODE (member_type) == METHOD_TYPE)
7688 cp_cv_quals quals = type_memfn_quals (member_type);
7689 member_type = build_memfn_type (member_type, class_type, quals);
7690 return build_ptrmemfunc_type (build_pointer_type (member_type));
7694 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7695 return build_offset_type (class_type, member_type);
7699 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7700 Check to see that the definition is valid. Issue appropriate error
7701 messages. Return 1 if the definition is particularly bad, or 0
7705 check_static_variable_definition (tree decl, tree type)
7707 /* Can't check yet if we don't know the type. */
7708 if (dependent_type_p (type))
7710 /* If DECL is declared constexpr, we'll do the appropriate checks
7711 in check_initializer. */
7712 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7714 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7716 if (literal_type_p (type))
7717 error ("%<constexpr%> needed for in-class initialization of static "
7718 "data member %q#D of non-integral type", decl);
7720 error ("in-class initialization of static data member %q#D of "
7721 "non-literal type", decl);
7725 /* Motion 10 at San Diego: If a static const integral data member is
7726 initialized with an integral constant expression, the initializer
7727 may appear either in the declaration (within the class), or in
7728 the definition, but not both. If it appears in the class, the
7729 member is a member constant. The file-scope definition is always
7731 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7733 error ("invalid in-class initialization of static data member "
7734 "of non-integral type %qT",
7738 else if (!CP_TYPE_CONST_P (type))
7739 error ("ISO C++ forbids in-class initialization of non-const "
7740 "static member %qD",
7742 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7743 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7744 "%qD of non-integral type %qT", decl, type);
7749 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7750 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7751 expressions out into temporary variables so that walk_tree doesn't
7752 step into them (c++/15764). */
7755 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7757 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7758 tree expr = *expr_p;
7759 if (TREE_CODE (expr) == SAVE_EXPR)
7761 tree op = TREE_OPERAND (expr, 0);
7762 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7763 if (TREE_SIDE_EFFECTS (op))
7764 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7767 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7772 /* Entry point for the above. */
7775 stabilize_vla_size (tree size)
7777 struct pointer_set_t *pset = pointer_set_create ();
7778 /* Break out any function calls into temporary variables. */
7779 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7782 /* Given the SIZE (i.e., number of elements) in an array, compute an
7783 appropriate index type for the array. If non-NULL, NAME is the
7784 name of the thing being declared. */
7787 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7792 tree abi_1_itype = NULL_TREE;
7794 if (error_operand_p (size))
7795 return error_mark_node;
7797 type = TREE_TYPE (size);
7798 /* type_dependent_expression_p? */
7799 if (!dependent_type_p (type))
7801 mark_rvalue_use (size);
7803 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7804 && TREE_SIDE_EFFECTS (size))
7805 /* In C++98, we mark a non-constant array bound with a magic
7806 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7809 size = fold_non_dependent_expr (size);
7811 if (CLASS_TYPE_P (type)
7812 && CLASSTYPE_LITERAL_P (type))
7814 size = build_expr_type_conversion (WANT_INT, size, true);
7817 if (!(complain & tf_error))
7818 return error_mark_node;
7820 error ("size of array %qD has non-integral type %qT",
7823 error ("size of array has non-integral type %qT", type);
7824 size = integer_one_node;
7826 if (size == error_mark_node)
7827 return error_mark_node;
7828 type = TREE_TYPE (size);
7829 /* We didn't support this case in GCC 3.2, so don't bother
7830 trying to model it now in ABI v1. */
7831 abi_1_itype = error_mark_node;
7834 size = maybe_constant_value (size);
7835 if (!TREE_CONSTANT (size))
7839 if (error_operand_p (size))
7840 return error_mark_node;
7842 /* The array bound must be an integer type. */
7843 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7845 if (!(complain & tf_error))
7846 return error_mark_node;
7848 error ("size of array %qD has non-integral type %qT", name, type);
7850 error ("size of array has non-integral type %qT", type);
7851 size = integer_one_node;
7852 type = TREE_TYPE (size);
7856 /* A type is dependent if it is...an array type constructed from any
7857 dependent type or whose size is specified by a constant expression
7858 that is value-dependent. */
7859 /* We can only call value_dependent_expression_p on integral constant
7860 expressions; treat non-constant expressions as dependent, too. */
7861 if (processing_template_decl
7862 && (dependent_type_p (type)
7863 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7865 /* We cannot do any checking for a SIZE that isn't known to be
7866 constant. Just build the index type and mark that it requires
7867 structural equality checks. */
7868 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7869 size, integer_one_node));
7870 TYPE_DEPENDENT_P (itype) = 1;
7871 TYPE_DEPENDENT_P_VALID (itype) = 1;
7872 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7876 if (!abi_version_at_least (2) && processing_template_decl
7877 && abi_1_itype == NULL_TREE)
7878 /* For abi-1, we handled all instances in templates the same way,
7879 even when they were non-dependent. This affects the manglings
7880 produced. So, we do the normal checking for non-dependent
7881 sizes, but at the end we'll return the same type that abi-1
7882 would have, but with TYPE_CANONICAL set to the "right"
7883 value that the current ABI would provide. */
7884 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7885 osize, integer_one_node));
7887 /* Normally, the array-bound will be a constant. */
7888 if (TREE_CODE (size) == INTEGER_CST)
7890 /* Check to see if the array bound overflowed. Make that an
7891 error, no matter how generous we're being. */
7892 constant_expression_error (size);
7894 /* An array must have a positive number of elements. */
7895 if (INT_CST_LT (size, integer_zero_node))
7897 if (!(complain & tf_error))
7898 return error_mark_node;
7900 error ("size of array %qD is negative", name);
7902 error ("size of array is negative");
7903 size = integer_one_node;
7905 /* As an extension we allow zero-sized arrays. */
7906 else if (integer_zerop (size))
7908 if (!(complain & tf_error))
7909 /* We must fail if performing argument deduction (as
7910 indicated by the state of complain), so that
7911 another substitution can be found. */
7912 return error_mark_node;
7913 else if (in_system_header)
7914 /* Allow them in system headers because glibc uses them. */;
7916 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7918 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7921 else if (TREE_CONSTANT (size)
7922 /* We don't allow VLAs at non-function scopes, or during
7923 tentative template substitution. */
7924 || !at_function_scope_p () || !(complain & tf_error))
7926 if (!(complain & tf_error))
7927 return error_mark_node;
7928 /* `(int) &fn' is not a valid array bound. */
7930 error ("size of array %qD is not an integral constant-expression",
7933 error ("size of array is not an integral constant-expression");
7934 size = integer_one_node;
7936 else if (pedantic && warn_vla != 0)
7939 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7941 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7943 else if (warn_vla > 0)
7947 "variable length array %qD is used", name);
7950 "variable length array is used");
7953 if (processing_template_decl && !TREE_CONSTANT (size))
7954 /* A variable sized array. */
7955 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7958 HOST_WIDE_INT saved_processing_template_decl;
7960 /* Compute the index of the largest element in the array. It is
7961 one less than the number of elements in the array. We save
7962 and restore PROCESSING_TEMPLATE_DECL so that computations in
7963 cp_build_binary_op will be appropriately folded. */
7964 saved_processing_template_decl = processing_template_decl;
7965 processing_template_decl = 0;
7966 itype = cp_build_binary_op (input_location,
7968 cp_convert (ssizetype, size),
7969 cp_convert (ssizetype, integer_one_node),
7970 tf_warning_or_error);
7971 itype = fold (itype);
7972 processing_template_decl = saved_processing_template_decl;
7974 if (!TREE_CONSTANT (itype))
7975 /* A variable sized array. */
7976 itype = variable_size (itype);
7977 /* Make sure that there was no overflow when creating to a signed
7978 index type. (For example, on a 32-bit machine, an array with
7979 size 2^32 - 1 is too big.) */
7980 else if (TREE_CODE (itype) == INTEGER_CST
7981 && TREE_OVERFLOW (itype))
7983 if (!(complain & tf_error))
7984 return error_mark_node;
7985 error ("overflow in array dimension");
7986 TREE_OVERFLOW (itype) = 0;
7990 /* Create and return the appropriate index type. */
7991 if (abi_1_itype && abi_1_itype != error_mark_node)
7993 tree t = build_index_type (itype);
7994 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7995 itype = abi_1_itype;
7998 itype = build_index_type (itype);
8000 /* If the index type were dependent, we would have returned early, so
8001 remember that it isn't. */
8002 TYPE_DEPENDENT_P (itype) = 0;
8003 TYPE_DEPENDENT_P_VALID (itype) = 1;
8007 /* Returns the scope (if any) in which the entity declared by
8008 DECLARATOR will be located. If the entity was declared with an
8009 unqualified name, NULL_TREE is returned. */
8012 get_scope_of_declarator (const cp_declarator *declarator)
8014 while (declarator && declarator->kind != cdk_id)
8015 declarator = declarator->declarator;
8017 /* If the declarator-id is a SCOPE_REF, the scope in which the
8018 declaration occurs is the first operand. */
8020 && declarator->u.id.qualifying_scope)
8021 return declarator->u.id.qualifying_scope;
8023 /* Otherwise, the declarator is not a qualified name; the entity will
8024 be declared in the current scope. */
8028 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8029 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8033 create_array_type_for_decl (tree name, tree type, tree size)
8035 tree itype = NULL_TREE;
8037 /* If things have already gone awry, bail now. */
8038 if (type == error_mark_node || size == error_mark_node)
8039 return error_mark_node;
8041 /* 8.3.4/1: If the type of the identifier of D contains the auto
8042 type-specifier, the program is ill-formed. */
8043 if (pedantic && type_uses_auto (type))
8044 pedwarn (input_location, OPT_pedantic,
8045 "declaration of %qD as array of %<auto%>", name);
8047 /* If there are some types which cannot be array elements,
8048 issue an error-message and return. */
8049 switch (TREE_CODE (type))
8053 error ("declaration of %qD as array of void", name);
8055 error ("creating array of void");
8056 return error_mark_node;
8060 error ("declaration of %qD as array of functions", name);
8062 error ("creating array of functions");
8063 return error_mark_node;
8065 case REFERENCE_TYPE:
8067 error ("declaration of %qD as array of references", name);
8069 error ("creating array of references");
8070 return error_mark_node;
8074 error ("declaration of %qD as array of function members", name);
8076 error ("creating array of function members");
8077 return error_mark_node;
8085 The constant expressions that specify the bounds of the arrays
8086 can be omitted only for the first member of the sequence. */
8087 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8090 error ("declaration of %qD as multidimensional array must "
8091 "have bounds for all dimensions except the first",
8094 error ("multidimensional array must have bounds for all "
8095 "dimensions except the first");
8097 return error_mark_node;
8100 /* Figure out the index type for the array. */
8102 itype = compute_array_index_type (name, size, tf_warning_or_error);
8105 T is called the array element type; this type shall not be [...] an
8106 abstract class type. */
8107 abstract_virtuals_error (name, type);
8109 return build_cplus_array_type (type, itype);
8112 /* Check that it's OK to declare a function with the indicated TYPE.
8113 SFK indicates the kind of special function (if any) that this
8114 function is. OPTYPE is the type given in a conversion operator
8115 declaration, or the class type for a constructor/destructor.
8116 Returns the actual return type of the function; that
8117 may be different than TYPE if an error occurs, or for certain
8118 special functions. */
8121 check_special_function_return_type (special_function_kind sfk,
8127 case sfk_constructor:
8129 error ("return type specification for constructor invalid");
8131 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8132 type = build_pointer_type (optype);
8134 type = void_type_node;
8137 case sfk_destructor:
8139 error ("return type specification for destructor invalid");
8140 /* We can't use the proper return type here because we run into
8141 problems with ambiguous bases and covariant returns.
8142 Java classes are left unchanged because (void *) isn't a valid
8143 Java type, and we don't want to change the Java ABI. */
8144 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8145 type = build_pointer_type (void_type_node);
8147 type = void_type_node;
8150 case sfk_conversion:
8152 error ("return type specified for %<operator %T%>", optype);
8163 /* A variable or data member (whose unqualified name is IDENTIFIER)
8164 has been declared with the indicated TYPE. If the TYPE is not
8165 acceptable, issue an error message and return a type to use for
8166 error-recovery purposes. */
8169 check_var_type (tree identifier, tree type)
8171 if (VOID_TYPE_P (type))
8174 error ("unnamed variable or field declared void");
8175 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8177 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8178 error ("variable or field %qE declared void", identifier);
8181 error ("variable or field declared void");
8182 type = error_mark_node;
8188 /* Given declspecs and a declarator (abstract or otherwise), determine
8189 the name and type of the object declared and construct a DECL node
8192 DECLSPECS points to the representation of declaration-specifier
8193 sequence that precedes declarator.
8195 DECL_CONTEXT says which syntactic context this declaration is in:
8196 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8197 FUNCDEF for a function definition. Like NORMAL but a few different
8198 error messages in each case. Return value may be zero meaning
8199 this definition is too screwy to try to parse.
8200 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8201 handle member functions (which have FIELD context).
8202 Return value may be zero meaning this definition is too screwy to
8204 PARM for a parameter declaration (either within a function prototype
8205 or before a function body). Make a PARM_DECL, or return void_type_node.
8206 TPARM for a template parameter declaration.
8207 CATCHPARM for a parameter declaration before a catch clause.
8208 TYPENAME if for a typename (in a cast or sizeof).
8209 Don't make a DECL node; just return the ..._TYPE node.
8210 FIELD for a struct or union field; make a FIELD_DECL.
8211 BITFIELD for a field with specified width.
8213 INITIALIZED is as for start_decl.
8215 ATTRLIST is a pointer to the list of attributes, which may be NULL
8216 if there are none; *ATTRLIST may be modified if attributes from inside
8217 the declarator should be applied to the declaration.
8219 When this function is called, scoping variables (such as
8220 CURRENT_CLASS_TYPE) should reflect the scope in which the
8221 declaration occurs, not the scope in which the new declaration will
8222 be placed. For example, on:
8226 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8229 Returns a DECL (if a declarator is present), a TYPE (if there is no
8230 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8234 grokdeclarator (const cp_declarator *declarator,
8235 const cp_decl_specifier_seq *declspecs,
8236 enum decl_context decl_context,
8240 tree type = NULL_TREE;
8242 int explicit_int128 = 0;
8243 int virtualp, explicitp, friendp, inlinep, staticp;
8244 int explicit_int = 0;
8245 int explicit_char = 0;
8246 int defaulted_int = 0;
8247 tree dependent_name = NULL_TREE;
8249 tree typedef_decl = NULL_TREE;
8250 const char *name = NULL;
8251 tree typedef_type = NULL_TREE;
8252 /* True if this declarator is a function definition. */
8253 bool funcdef_flag = false;
8254 cp_declarator_kind innermost_code = cdk_error;
8257 /* See the code below that used this. */
8258 tree decl_attr = NULL_TREE;
8261 /* Keep track of what sort of function is being processed
8262 so that we can warn about default return values, or explicit
8263 return values which do not match prescribed defaults. */
8264 special_function_kind sfk = sfk_none;
8266 tree dname = NULL_TREE;
8267 tree ctor_return_type = NULL_TREE;
8268 enum overload_flags flags = NO_SPECIAL;
8269 /* cv-qualifiers that apply to the declarator, for a declaration of
8270 a member function. */
8271 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8272 /* virt-specifiers that apply to the declarator, for a declaration of
8273 a member function. */
8274 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8275 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8277 tree raises = NULL_TREE;
8278 int template_count = 0;
8279 tree returned_attrs = NULL_TREE;
8280 tree parms = NULL_TREE;
8281 const cp_declarator *id_declarator;
8282 /* The unqualified name of the declarator; either an
8283 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8284 tree unqualified_id;
8285 /* The class type, if any, in which this entity is located,
8286 or NULL_TREE if none. Note that this value may be different from
8287 the current class type; for example if an attempt is made to declare
8288 "A::f" inside "B", this value will be "A". */
8289 tree ctype = current_class_type;
8290 /* The NAMESPACE_DECL for the namespace in which this entity is
8291 located. If an unqualified name is used to declare the entity,
8292 this value will be NULL_TREE, even if the entity is located at
8294 tree in_namespace = NULL_TREE;
8295 cp_storage_class storage_class;
8296 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8297 bool type_was_error_mark_node = false;
8298 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8299 bool template_type_arg = false;
8300 bool template_parm_flag = false;
8301 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8304 signed_p = declspecs->specs[(int)ds_signed];
8305 unsigned_p = declspecs->specs[(int)ds_unsigned];
8306 short_p = declspecs->specs[(int)ds_short];
8307 long_p = declspecs->specs[(int)ds_long];
8308 longlong = declspecs->specs[(int)ds_long] >= 2;
8309 explicit_int128 = declspecs->explicit_int128_p;
8310 thread_p = declspecs->specs[(int)ds_thread];
8312 if (decl_context == FUNCDEF)
8313 funcdef_flag = true, decl_context = NORMAL;
8314 else if (decl_context == MEMFUNCDEF)
8315 funcdef_flag = true, decl_context = FIELD;
8316 else if (decl_context == BITFIELD)
8317 bitfield = 1, decl_context = FIELD;
8318 else if (decl_context == TEMPLATE_TYPE_ARG)
8319 template_type_arg = true, decl_context = TYPENAME;
8320 else if (decl_context == TPARM)
8321 template_parm_flag = true, decl_context = PARM;
8323 if (initialized > 1)
8324 funcdef_flag = true;
8326 /* Look inside a declarator for the name being declared
8327 and get it as a string, for an error message. */
8328 for (id_declarator = declarator;
8330 id_declarator = id_declarator->declarator)
8332 if (id_declarator->kind != cdk_id)
8333 innermost_code = id_declarator->kind;
8335 switch (id_declarator->kind)
8338 if (id_declarator->declarator
8339 && id_declarator->declarator->kind == cdk_id)
8341 sfk = id_declarator->declarator->u.id.sfk;
8342 if (sfk == sfk_destructor)
8349 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8350 tree decl = id_declarator->u.id.unqualified_name;
8353 if (qualifying_scope)
8355 if (at_function_scope_p ())
8359 A declarator-id shall not be qualified except
8362 None of the cases are permitted in block
8364 if (qualifying_scope == global_namespace)
8365 error ("invalid use of qualified-name %<::%D%>",
8367 else if (TYPE_P (qualifying_scope))
8368 error ("invalid use of qualified-name %<%T::%D%>",
8369 qualifying_scope, decl);
8371 error ("invalid use of qualified-name %<%D::%D%>",
8372 qualifying_scope, decl);
8373 return error_mark_node;
8375 else if (TYPE_P (qualifying_scope))
8377 ctype = qualifying_scope;
8378 if (!MAYBE_CLASS_TYPE_P (ctype))
8380 error ("%q#T is not a class or a namespace", ctype);
8383 else if (innermost_code != cdk_function
8384 && current_class_type
8385 && !UNIQUELY_DERIVED_FROM_P (ctype,
8386 current_class_type))
8388 error ("type %qT is not derived from type %qT",
8389 ctype, current_class_type);
8390 return error_mark_node;
8393 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8394 in_namespace = qualifying_scope;
8396 switch (TREE_CODE (decl))
8402 if (innermost_code != cdk_function)
8404 error ("declaration of %qD as non-function", decl);
8405 return error_mark_node;
8407 else if (!qualifying_scope
8408 && !(current_class_type && at_class_scope_p ()))
8410 error ("declaration of %qD as non-member", decl);
8411 return error_mark_node;
8414 type = TREE_OPERAND (decl, 0);
8416 type = constructor_name (type);
8417 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8422 case TEMPLATE_ID_EXPR:
8424 tree fns = TREE_OPERAND (decl, 0);
8427 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8429 gcc_assert (is_overloaded_fn (dname));
8430 dname = DECL_NAME (get_first_fn (dname));
8435 case IDENTIFIER_NODE:
8436 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8439 if (C_IS_RESERVED_WORD (dname))
8441 error ("declarator-id missing; using reserved word %qD",
8443 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8445 else if (!IDENTIFIER_TYPENAME_P (dname))
8446 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8449 gcc_assert (flags == NO_SPECIAL);
8450 flags = TYPENAME_FLAG;
8451 ctor_return_type = TREE_TYPE (dname);
8452 sfk = sfk_conversion;
8453 if (is_typename_at_global_scope (dname))
8454 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8456 name = "<invalid operator>";
8473 return error_mark_node;
8478 if (id_declarator->kind == cdk_id)
8484 The declarator in a function-definition shall have the form
8485 D1 ( parameter-declaration-clause) ... */
8486 if (funcdef_flag && innermost_code != cdk_function)
8488 error ("function definition does not declare parameters");
8489 return error_mark_node;
8492 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8493 && innermost_code != cdk_function
8494 && ! (ctype && !declspecs->any_specifiers_p))
8496 error ("declaration of %qD as non-function", dname);
8497 return error_mark_node;
8500 if (dname && IDENTIFIER_OPNAME_P (dname))
8502 if (declspecs->specs[(int)ds_typedef])
8504 error ("declaration of %qD as %<typedef%>", dname);
8505 return error_mark_node;
8507 else if (decl_context == PARM || decl_context == CATCHPARM)
8509 error ("declaration of %qD as parameter", dname);
8510 return error_mark_node;
8514 /* Anything declared one level down from the top level
8515 must be one of the parameters of a function
8516 (because the body is at least two levels down). */
8518 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8519 by not allowing C++ class definitions to specify their parameters
8520 with xdecls (must be spec.d in the parmlist).
8522 Since we now wait to push a class scope until we are sure that
8523 we are in a legitimate method context, we must set oldcname
8524 explicitly (since current_class_name is not yet alive).
8526 We also want to avoid calling this a PARM if it is in a namespace. */
8528 if (decl_context == NORMAL && !toplevel_bindings_p ())
8530 cp_binding_level *b = current_binding_level;
8531 current_binding_level = b->level_chain;
8532 if (current_binding_level != 0 && toplevel_bindings_p ())
8533 decl_context = PARM;
8534 current_binding_level = b;
8538 name = decl_context == PARM ? "parameter" : "type name";
8540 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8542 error ("%<constexpr%> cannot appear in a typedef declaration");
8543 return error_mark_node;
8546 /* If there were multiple types specified in the decl-specifier-seq,
8547 issue an error message. */
8548 if (declspecs->multiple_types_p)
8550 error ("two or more data types in declaration of %qs", name);
8551 return error_mark_node;
8554 if (declspecs->conflicting_specifiers_p)
8556 error ("conflicting specifiers in declaration of %qs", name);
8557 return error_mark_node;
8560 /* Extract the basic type from the decl-specifier-seq. */
8561 type = declspecs->type;
8562 if (type == error_mark_node)
8565 type_was_error_mark_node = true;
8567 /* If the entire declaration is itself tagged as deprecated then
8568 suppress reports of deprecated items. */
8569 if (type && TREE_DEPRECATED (type)
8570 && deprecated_state != DEPRECATED_SUPPRESS)
8571 warn_deprecated_use (type, NULL_TREE);
8572 if (type && TREE_CODE (type) == TYPE_DECL)
8574 typedef_decl = type;
8575 type = TREE_TYPE (typedef_decl);
8576 if (TREE_DEPRECATED (type)
8577 && DECL_ARTIFICIAL (typedef_decl)
8578 && deprecated_state != DEPRECATED_SUPPRESS)
8579 warn_deprecated_use (type, NULL_TREE);
8581 /* No type at all: default to `int', and set DEFAULTED_INT
8582 because it was not a user-defined typedef. */
8583 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8585 /* These imply 'int'. */
8586 type = integer_type_node;
8590 explicit_int = declspecs->explicit_int_p;
8591 explicit_char = declspecs->explicit_char_p;
8594 /* See the code below that used this. */
8596 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8598 typedef_type = type;
8601 if (sfk != sfk_conversion)
8602 ctor_return_type = ctype;
8604 if (sfk != sfk_none)
8605 type = check_special_function_return_type (sfk, type,
8607 else if (type == NULL_TREE)
8613 /* We handle `main' specially here, because 'main () { }' is so
8614 common. With no options, it is allowed. With -Wreturn-type,
8615 it is a warning. It is only an error with -pedantic-errors. */
8616 is_main = (funcdef_flag
8617 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8618 && MAIN_NAME_P (dname)
8619 && ctype == NULL_TREE
8620 && in_namespace == NULL_TREE
8621 && current_namespace == global_namespace);
8623 if (type_was_error_mark_node)
8624 /* We've already issued an error, don't complain more. */;
8625 else if (in_system_header || flag_ms_extensions)
8626 /* Allow it, sigh. */;
8628 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8630 pedwarn (input_location, OPT_pedantic,
8631 "ISO C++ forbids declaration of %qs with no type", name);
8633 warning (OPT_Wreturn_type,
8634 "ISO C++ forbids declaration of %qs with no type", name);
8636 type = integer_type_node;
8641 /* Now process the modifiers that were specified
8642 and check for invalid combinations. */
8644 /* Long double is a special combination. */
8645 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8648 type = cp_build_qualified_type (long_double_type_node,
8649 cp_type_quals (type));
8652 /* Check all other uses of type modifiers. */
8654 if (unsigned_p || signed_p || long_p || short_p)
8658 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8659 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8660 else if (signed_p && unsigned_p)
8661 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8662 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8663 error ("%<long long%> invalid for %qs", name);
8664 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8665 error ("%<__int128%> invalid for %qs", name);
8666 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8667 error ("%<long%> invalid for %qs", name);
8668 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8669 error ("%<short%> invalid for %qs", name);
8670 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8671 error ("%<long%> or %<short%> invalid for %qs", name);
8672 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8673 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8674 else if ((long_p || short_p) && explicit_char)
8675 error ("%<long%> or %<short%> specified with char for %qs", name);
8676 else if (long_p && short_p)
8677 error ("%<long%> and %<short%> specified together for %qs", name);
8678 else if (type == char16_type_node || type == char32_type_node)
8680 if (signed_p || unsigned_p)
8681 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8682 else if (short_p || long_p)
8683 error ("%<short%> or %<long%> invalid for %qs", name);
8688 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8690 pedwarn (input_location, OPT_pedantic,
8691 "long, short, signed or unsigned used invalidly for %qs",
8693 if (flag_pedantic_errors)
8696 if (explicit_int128)
8698 if (int128_integer_type_node == NULL_TREE)
8700 error ("%<__int128%> is not supported by this target");
8705 pedwarn (input_location, OPT_pedantic,
8706 "ISO C++ does not support %<__int128%> for %qs",
8708 if (flag_pedantic_errors)
8714 /* Discard the type modifiers if they are invalid. */
8722 explicit_int128 = false;
8726 /* Decide whether an integer type is signed or not.
8727 Optionally treat bitfields as signed by default. */
8731 It is implementation-defined whether a plain (neither
8732 explicitly signed or unsigned) char, short, int, or long
8733 bit-field is signed or unsigned.
8735 Naturally, we extend this to long long as well. Note that
8736 this does not include wchar_t. */
8737 || (bitfield && !flag_signed_bitfields
8739 /* A typedef for plain `int' without `signed' can be
8740 controlled just like plain `int', but a typedef for
8741 `signed int' cannot be so controlled. */
8743 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8744 && TREE_CODE (type) == INTEGER_TYPE
8745 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8747 if (explicit_int128)
8748 type = int128_unsigned_type_node;
8750 type = long_long_unsigned_type_node;
8752 type = long_unsigned_type_node;
8754 type = short_unsigned_type_node;
8755 else if (type == char_type_node)
8756 type = unsigned_char_type_node;
8757 else if (typedef_decl)
8758 type = unsigned_type_for (type);
8760 type = unsigned_type_node;
8762 else if (signed_p && type == char_type_node)
8763 type = signed_char_type_node;
8764 else if (explicit_int128)
8765 type = int128_integer_type_node;
8767 type = long_long_integer_type_node;
8769 type = long_integer_type_node;
8771 type = short_integer_type_node;
8773 if (declspecs->specs[(int)ds_complex])
8775 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8776 error ("complex invalid for %qs", name);
8777 /* If we just have "complex", it is equivalent to
8778 "complex double", but if any modifiers at all are specified it is
8779 the complex form of TYPE. E.g, "complex short" is
8780 "complex short int". */
8781 else if (defaulted_int && ! longlong && ! explicit_int128
8782 && ! (long_p || short_p || signed_p || unsigned_p))
8783 type = complex_double_type_node;
8784 else if (type == integer_type_node)
8785 type = complex_integer_type_node;
8786 else if (type == float_type_node)
8787 type = complex_float_type_node;
8788 else if (type == double_type_node)
8789 type = complex_double_type_node;
8790 else if (type == long_double_type_node)
8791 type = complex_long_double_type_node;
8793 type = build_complex_type (type);
8796 type_quals = TYPE_UNQUALIFIED;
8797 if (declspecs->specs[(int)ds_const])
8798 type_quals |= TYPE_QUAL_CONST;
8799 if (declspecs->specs[(int)ds_volatile])
8800 type_quals |= TYPE_QUAL_VOLATILE;
8801 if (declspecs->specs[(int)ds_restrict])
8802 type_quals |= TYPE_QUAL_RESTRICT;
8803 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8804 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8807 type_quals |= cp_type_quals (type);
8808 type = cp_build_qualified_type_real
8809 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8810 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8811 /* We might have ignored or rejected some of the qualifiers. */
8812 type_quals = cp_type_quals (type);
8815 inlinep = !! declspecs->specs[(int)ds_inline];
8816 virtualp = !! declspecs->specs[(int)ds_virtual];
8817 explicitp = !! declspecs->specs[(int)ds_explicit];
8819 storage_class = declspecs->storage_class;
8820 if (storage_class == sc_static)
8821 staticp = 1 + (decl_context == FIELD);
8823 if (virtualp && staticp == 2)
8825 error ("member %qD cannot be declared both virtual and static", dname);
8826 storage_class = sc_none;
8829 friendp = !! declspecs->specs[(int)ds_friend];
8831 if (dependent_name && !friendp)
8833 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8834 return error_mark_node;
8837 /* Issue errors about use of storage classes for parameters. */
8838 if (decl_context == PARM)
8840 if (declspecs->specs[(int)ds_typedef])
8842 error ("typedef declaration invalid in parameter declaration");
8843 return error_mark_node;
8845 else if (template_parm_flag && storage_class != sc_none)
8847 error ("storage class specified for template parameter %qs", name);
8848 return error_mark_node;
8850 else if (storage_class == sc_static
8851 || storage_class == sc_extern
8853 error ("storage class specifiers invalid in parameter declarations");
8855 /* Function parameters cannot be constexpr. If we saw one, moan
8856 and pretend it wasn't there. */
8859 error ("a parameter cannot be declared %<constexpr%>");
8864 /* Give error if `virtual' is used outside of class declaration. */
8866 && (current_class_name == NULL_TREE || decl_context != FIELD))
8868 error ("%<virtual%> outside class declaration");
8872 /* Static anonymous unions are dealt with here. */
8873 if (staticp && decl_context == TYPENAME
8875 && ANON_AGGR_TYPE_P (declspecs->type))
8876 decl_context = FIELD;
8878 /* Warn about storage classes that are invalid for certain
8879 kinds of declarations (parameters, typenames, etc.). */
8882 && storage_class != sc_extern
8883 && storage_class != sc_static)
8884 || declspecs->specs[(int)ds_typedef]))
8886 error ("multiple storage classes in declaration of %qs", name);
8889 if (decl_context != NORMAL
8890 && ((storage_class != sc_none
8891 && storage_class != sc_mutable)
8894 if ((decl_context == PARM || decl_context == CATCHPARM)
8895 && (storage_class == sc_register
8896 || storage_class == sc_auto))
8898 else if (declspecs->specs[(int)ds_typedef])
8900 else if (decl_context == FIELD
8901 /* C++ allows static class elements. */
8902 && storage_class == sc_static)
8903 /* C++ also allows inlines and signed and unsigned elements,
8904 but in those cases we don't come in here. */
8908 if (decl_context == FIELD)
8909 error ("storage class specified for %qs", name);
8912 if (decl_context == PARM || decl_context == CATCHPARM)
8913 error ("storage class specified for parameter %qs", name);
8915 error ("storage class specified for typename");
8917 if (storage_class == sc_register
8918 || storage_class == sc_auto
8919 || storage_class == sc_extern
8921 storage_class = sc_none;
8924 else if (storage_class == sc_extern && funcdef_flag
8925 && ! toplevel_bindings_p ())
8926 error ("nested function %qs declared %<extern%>", name);
8927 else if (toplevel_bindings_p ())
8929 if (storage_class == sc_auto)
8930 error ("top-level declaration of %qs specifies %<auto%>", name);
8933 && storage_class != sc_extern
8934 && storage_class != sc_static)
8936 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8941 if (storage_class && friendp)
8943 error ("storage class specifiers invalid in friend function declarations");
8944 storage_class = sc_none;
8949 unqualified_id = NULL_TREE;
8952 unqualified_id = id_declarator->u.id.unqualified_name;
8953 switch (TREE_CODE (unqualified_id))
8956 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8957 if (TYPE_P (unqualified_id))
8958 unqualified_id = constructor_name (unqualified_id);
8961 case IDENTIFIER_NODE:
8962 case TEMPLATE_ID_EXPR:
8970 /* Determine the type of the entity declared by recurring on the
8972 for (; declarator; declarator = declarator->declarator)
8974 const cp_declarator *inner_declarator;
8977 if (type == error_mark_node)
8978 return error_mark_node;
8980 attrs = declarator->attributes;
8986 if (declarator == NULL || declarator->kind == cdk_id)
8987 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8988 if (declarator->kind == cdk_function)
8989 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8990 if (declarator->kind == cdk_array)
8991 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8992 returned_attrs = decl_attributes (&type,
8993 chainon (returned_attrs, attrs),
8997 if (declarator->kind == cdk_id)
9000 inner_declarator = declarator->declarator;
9002 switch (declarator->kind)
9005 type = create_array_type_for_decl (dname, type,
9006 declarator->u.array.bounds);
9014 /* Declaring a function type.
9015 Make sure we have a valid type for the function to return. */
9017 if (type_quals != TYPE_UNQUALIFIED)
9019 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9020 warning (OPT_Wignored_qualifiers,
9021 "type qualifiers ignored on function return type");
9022 /* We now know that the TYPE_QUALS don't apply to the
9023 decl, but to its return type. */
9024 type_quals = TYPE_UNQUALIFIED;
9026 errmsg = targetm.invalid_return_type (type);
9030 type = integer_type_node;
9033 /* Error about some types functions can't return. */
9035 if (TREE_CODE (type) == FUNCTION_TYPE)
9037 error ("%qs declared as function returning a function", name);
9038 return error_mark_node;
9040 if (TREE_CODE (type) == ARRAY_TYPE)
9042 error ("%qs declared as function returning an array", name);
9043 return error_mark_node;
9046 /* Pick up type qualifiers which should be applied to `this'. */
9047 memfn_quals = declarator->u.function.qualifiers;
9048 /* Pick up virt-specifiers. */
9049 virt_specifiers = declarator->u.function.virt_specifiers;
9050 /* Pick up the exception specifications. */
9051 raises = declarator->u.function.exception_specification;
9053 /* Say it's a definition only for the CALL_EXPR
9054 closest to the identifier. */
9055 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9057 /* Handle a late-specified return type. */
9060 if (type_uses_auto (type))
9062 if (!declarator->u.function.late_return_type)
9064 error ("%qs function uses %<auto%> type specifier without"
9065 " late return type", name);
9066 return error_mark_node;
9068 else if (!is_auto (type))
9070 error ("%qs function with late return type has"
9071 " %qT as its type rather than plain %<auto%>",
9073 return error_mark_node;
9076 else if (declarator->u.function.late_return_type)
9078 error ("%qs function with late return type not declared"
9079 " with %<auto%> type specifier", name);
9080 return error_mark_node;
9083 type = splice_late_return_type
9084 (type, declarator->u.function.late_return_type);
9085 if (type == error_mark_node)
9086 return error_mark_node;
9088 if (ctype == NULL_TREE
9089 && decl_context == FIELD
9091 && (friendp == 0 || dname == current_class_name))
9092 ctype = current_class_type;
9094 if (ctype && (sfk == sfk_constructor
9095 || sfk == sfk_destructor))
9097 /* We are within a class's scope. If our declarator name
9098 is the same as the class name, and we are defining
9099 a function, then it is a constructor/destructor, and
9100 therefore returns a void type. */
9102 /* ISO C++ 12.4/2. A destructor may not be declared
9103 const or volatile. A destructor may not be
9106 ISO C++ 12.1. A constructor may not be declared
9107 const or volatile. A constructor may not be
9108 virtual. A constructor may not be static. */
9110 error ((flags == DTOR_FLAG)
9111 ? "destructor cannot be static member function"
9112 : "constructor cannot be static member function");
9115 error ((flags == DTOR_FLAG)
9116 ? "destructors may not be cv-qualified"
9117 : "constructors may not be cv-qualified");
9118 memfn_quals = TYPE_UNQUALIFIED;
9121 if (decl_context == FIELD
9122 && !member_function_or_else (ctype,
9125 return error_mark_node;
9127 if (flags != DTOR_FLAG)
9129 /* It's a constructor. */
9134 permerror (input_location, "constructors cannot be declared virtual");
9137 if (decl_context == FIELD
9138 && sfk != sfk_constructor)
9139 return error_mark_node;
9141 if (decl_context == FIELD)
9147 error ("can%'t initialize friend function %qs", name);
9150 /* Cannot be both friend and virtual. */
9151 error ("virtual functions cannot be friends");
9154 if (decl_context == NORMAL)
9155 error ("friend declaration not in class definition");
9156 if (current_function_decl && funcdef_flag)
9157 error ("can%'t define friend function %qs in a local "
9161 else if (ctype && sfk == sfk_conversion)
9165 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9170 arg_types = grokparms (declarator->u.function.parameters,
9173 if (inner_declarator
9174 && inner_declarator->kind == cdk_id
9175 && inner_declarator->u.id.sfk == sfk_destructor
9176 && arg_types != void_list_node)
9178 error ("destructors may not have parameters");
9179 arg_types = void_list_node;
9183 type = build_function_type (type, arg_types);
9190 /* Filter out pointers-to-references and references-to-references.
9191 We can get these if a TYPE_DECL is used. */
9193 if (TREE_CODE (type) == REFERENCE_TYPE)
9195 if (declarator->kind != cdk_reference)
9197 error ("cannot declare pointer to %q#T", type);
9198 type = TREE_TYPE (type);
9201 /* In C++0x, we allow reference to reference declarations
9202 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9203 and template type arguments [14.3.1/4 temp.arg.type]. The
9204 check for direct reference to reference declarations, which
9205 are still forbidden, occurs below. Reasoning behind the change
9206 can be found in DR106, DR540, and the rvalue reference
9208 else if (cxx_dialect == cxx98)
9210 error ("cannot declare reference to %q#T", type);
9211 type = TREE_TYPE (type);
9214 else if (VOID_TYPE_P (type))
9216 if (declarator->kind == cdk_reference)
9217 error ("cannot declare reference to %q#T", type);
9218 else if (declarator->kind == cdk_ptrmem)
9219 error ("cannot declare pointer to %q#T member", type);
9222 /* We now know that the TYPE_QUALS don't apply to the decl,
9223 but to the target of the pointer. */
9224 type_quals = TYPE_UNQUALIFIED;
9226 if (declarator->kind == cdk_ptrmem
9227 && (TREE_CODE (type) == FUNCTION_TYPE
9228 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9230 memfn_quals |= type_memfn_quals (type);
9231 type = build_memfn_type (type,
9232 declarator->u.pointer.class_type,
9234 if (type == error_mark_node)
9235 return error_mark_node;
9236 memfn_quals = TYPE_UNQUALIFIED;
9239 if (TREE_CODE (type) == FUNCTION_TYPE
9240 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9241 error (declarator->kind == cdk_reference
9242 ? G_("cannot declare reference to qualified function type %qT")
9243 : G_("cannot declare pointer to qualified function type %qT"),
9246 /* When the pointed-to type involves components of variable size,
9247 care must be taken to ensure that the size evaluation code is
9248 emitted early enough to dominate all the possible later uses
9249 and late enough for the variables on which it depends to have
9252 This is expected to happen automatically when the pointed-to
9253 type has a name/declaration of it's own, but special attention
9254 is required if the type is anonymous.
9256 We handle the NORMAL and FIELD contexts here by inserting a
9257 dummy statement that just evaluates the size at a safe point
9258 and ensures it is not deferred until e.g. within a deeper
9259 conditional context (c++/43555).
9261 We expect nothing to be needed here for PARM or TYPENAME.
9262 Evaluating the size at this point for TYPENAME would
9263 actually be incorrect, as we might be in the middle of an
9264 expression with side effects on the pointed-to type size
9265 "arguments" prior to the pointer declaration point and the
9266 size evaluation could end up prior to the side effects. */
9268 if (!TYPE_NAME (type)
9269 && (decl_context == NORMAL || decl_context == FIELD)
9270 && at_function_scope_p ()
9271 && variably_modified_type_p (type, NULL_TREE))
9273 /* First break out any side-effects. */
9274 stabilize_vla_size (TYPE_SIZE (type));
9275 /* And then force evaluation of the SAVE_EXPR. */
9276 finish_expr_stmt (TYPE_SIZE (type));
9279 if (declarator->kind == cdk_reference)
9281 /* In C++0x, the type we are creating a reference to might be
9282 a typedef which is itself a reference type. In that case,
9283 we follow the reference collapsing rules in
9284 [7.1.3/8 dcl.typedef] to create the final reference type:
9286 "If a typedef TD names a type that is a reference to a type
9287 T, an attempt to create the type 'lvalue reference to cv TD'
9288 creates the type 'lvalue reference to T,' while an attempt
9289 to create the type "rvalue reference to cv TD' creates the
9292 if (VOID_TYPE_P (type))
9293 /* We already gave an error. */;
9294 else if (TREE_CODE (type) == REFERENCE_TYPE)
9296 if (declarator->u.reference.rvalue_ref)
9297 /* Leave type alone. */;
9299 type = cp_build_reference_type (TREE_TYPE (type), false);
9302 type = cp_build_reference_type
9303 (type, declarator->u.reference.rvalue_ref);
9305 /* In C++0x, we need this check for direct reference to
9306 reference declarations, which are forbidden by
9307 [8.3.2/5 dcl.ref]. Reference to reference declarations
9308 are only allowed indirectly through typedefs and template
9309 type arguments. Example:
9311 void foo(int & &); // invalid ref-to-ref decl
9313 typedef int & int_ref;
9314 void foo(int_ref &); // valid ref-to-ref decl
9316 if (inner_declarator && inner_declarator->kind == cdk_reference)
9317 error ("cannot declare reference to %q#T, which is not "
9318 "a typedef or a template type argument", type);
9320 else if (TREE_CODE (type) == METHOD_TYPE)
9321 type = build_ptrmemfunc_type (build_pointer_type (type));
9322 else if (declarator->kind == cdk_ptrmem)
9324 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9326 if (declarator->u.pointer.class_type == error_mark_node)
9327 /* We will already have complained. */
9328 type = error_mark_node;
9330 type = build_ptrmem_type (declarator->u.pointer.class_type,
9334 type = build_pointer_type (type);
9336 /* Process a list of type modifier keywords (such as
9337 const or volatile) that were given inside the `*' or `&'. */
9339 if (declarator->u.pointer.qualifiers)
9342 = cp_build_qualified_type (type,
9343 declarator->u.pointer.qualifiers);
9344 type_quals = cp_type_quals (type);
9357 /* We need to stabilize side-effects in VLA sizes for regular array
9358 declarations too, not just pointers to arrays. */
9359 if (type != error_mark_node && !TYPE_NAME (type)
9360 && (decl_context == NORMAL || decl_context == FIELD)
9361 && at_function_scope_p ()
9362 && variably_modified_type_p (type, NULL_TREE))
9363 stabilize_vla_size (TYPE_SIZE (type));
9365 /* A `constexpr' specifier used in an object declaration declares
9366 the object as `const'. */
9367 if (constexpr_p && innermost_code != cdk_function)
9369 if (type_quals & TYPE_QUAL_CONST)
9370 error ("both %<const%> and %<constexpr%> cannot be used here");
9371 if (type_quals & TYPE_QUAL_VOLATILE)
9372 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9373 if (TREE_CODE (type) != REFERENCE_TYPE)
9375 type_quals |= TYPE_QUAL_CONST;
9376 type = cp_build_qualified_type (type, type_quals);
9380 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9381 && TREE_CODE (type) != FUNCTION_TYPE
9382 && TREE_CODE (type) != METHOD_TYPE)
9384 error ("template-id %qD used as a declarator",
9386 unqualified_id = dname;
9389 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9390 qualified with a class-name, turn it into a METHOD_TYPE, unless
9391 we know that the function is static. We take advantage of this
9392 opportunity to do other processing that pertains to entities
9393 explicitly declared to be class members. Note that if DECLARATOR
9394 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9395 would not have exited the loop above. */
9397 && declarator->u.id.qualifying_scope
9398 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9402 ctype = declarator->u.id.qualifying_scope;
9403 ctype = TYPE_MAIN_VARIANT (ctype);
9405 while (t != NULL_TREE && CLASS_TYPE_P (t))
9407 /* You're supposed to have one `template <...>' for every
9408 template class, but you don't need one for a full
9409 specialization. For example:
9411 template <class T> struct S{};
9412 template <> struct S<int> { void f(); };
9413 void S<int>::f () {}
9415 is correct; there shouldn't be a `template <>' for the
9416 definition of `S<int>::f'. */
9417 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9418 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9419 /* T is an explicit (not partial) specialization. All
9420 containing classes must therefore also be explicitly
9423 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9424 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9425 template_count += 1;
9427 t = TYPE_MAIN_DECL (t);
9428 t = DECL_CONTEXT (t);
9431 if (ctype == current_class_type)
9435 permerror (input_location, "member functions are implicitly friends of their class");
9439 permerror (declarator->id_loc,
9440 "extra qualification %<%T::%> on member %qs",
9443 else if (/* If the qualifying type is already complete, then we
9444 can skip the following checks. */
9445 !COMPLETE_TYPE_P (ctype)
9446 && (/* If the function is being defined, then
9447 qualifying type must certainly be complete. */
9449 /* A friend declaration of "T::f" is OK, even if
9450 "T" is a template parameter. But, if this
9451 function is not a friend, the qualifying type
9453 || (!friendp && !CLASS_TYPE_P (ctype))
9454 /* For a declaration, the type need not be
9455 complete, if either it is dependent (since there
9456 is no meaningful definition of complete in that
9457 case) or the qualifying class is currently being
9459 || !(dependent_type_p (ctype)
9460 || currently_open_class (ctype)))
9461 /* Check that the qualifying type is complete. */
9462 && !complete_type_or_else (ctype, NULL_TREE))
9463 return error_mark_node;
9464 else if (TREE_CODE (type) == FUNCTION_TYPE)
9466 if (current_class_type
9467 && (!friendp || funcdef_flag))
9470 ? "cannot define member function %<%T::%s%> within %<%T%>"
9471 : "cannot declare member function %<%T::%s%> within %<%T%>",
9472 ctype, name, current_class_type);
9473 return error_mark_node;
9476 else if (declspecs->specs[(int)ds_typedef]
9477 && current_class_type)
9479 error ("cannot declare member %<%T::%s%> within %qT",
9480 ctype, name, current_class_type);
9481 return error_mark_node;
9485 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9486 ctype = current_class_type;
9488 /* Now TYPE has the actual type. */
9493 *attrlist = chainon (returned_attrs, *attrlist);
9495 attrlist = &returned_attrs;
9498 /* Handle parameter packs. */
9499 if (parameter_pack_p)
9501 if (decl_context == PARM)
9502 /* Turn the type into a pack expansion.*/
9503 type = make_pack_expansion (type);
9505 error ("non-parameter %qs cannot be a parameter pack", name);
9508 /* Did array size calculations overflow? */
9510 if (TREE_CODE (type) == ARRAY_TYPE
9511 && COMPLETE_TYPE_P (type)
9512 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9513 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9515 error ("size of array %qs is too large", name);
9516 /* If we proceed with the array type as it is, we'll eventually
9517 crash in tree_low_cst(). */
9518 type = error_mark_node;
9521 if ((decl_context == FIELD || decl_context == PARM)
9522 && !processing_template_decl
9523 && variably_modified_type_p (type, NULL_TREE))
9525 if (decl_context == FIELD)
9526 error ("data member may not have variably modified type %qT", type);
9528 error ("parameter may not have variably modified type %qT", type);
9529 type = error_mark_node;
9532 if (explicitp == 1 || (explicitp && friendp))
9534 /* [dcl.fct.spec] The explicit specifier shall only be used in
9535 declarations of constructors within a class definition. */
9536 error ("only declarations of constructors can be %<explicit%>");
9540 if (storage_class == sc_mutable)
9542 if (decl_context != FIELD || friendp)
9544 error ("non-member %qs cannot be declared %<mutable%>", name);
9545 storage_class = sc_none;
9547 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9549 error ("non-object member %qs cannot be declared %<mutable%>", name);
9550 storage_class = sc_none;
9552 else if (TREE_CODE (type) == FUNCTION_TYPE
9553 || TREE_CODE (type) == METHOD_TYPE)
9555 error ("function %qs cannot be declared %<mutable%>", name);
9556 storage_class = sc_none;
9560 error ("static %qs cannot be declared %<mutable%>", name);
9561 storage_class = sc_none;
9563 else if (type_quals & TYPE_QUAL_CONST)
9565 error ("const %qs cannot be declared %<mutable%>", name);
9566 storage_class = sc_none;
9568 else if (TREE_CODE (type) == REFERENCE_TYPE)
9570 permerror (input_location, "reference %qs cannot be declared "
9571 "%<mutable%>", name);
9572 storage_class = sc_none;
9576 /* If this is declaring a typedef name, return a TYPE_DECL. */
9577 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9581 /* Note that the grammar rejects storage classes
9582 in typenames, fields or parameters. */
9583 if (current_lang_name == lang_name_java)
9584 TYPE_FOR_JAVA (type) = 1;
9586 /* This declaration:
9588 typedef void f(int) const;
9590 declares a function type which is not a member of any
9591 particular class, but which is cv-qualified; for
9592 example "f S::*" declares a pointer to a const-qualified
9593 member function of S. We record the cv-qualification in the
9595 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9597 type = apply_memfn_quals (type, memfn_quals);
9599 /* We have now dealt with these qualifiers. */
9600 memfn_quals = TYPE_UNQUALIFIED;
9603 if (type_uses_auto (type))
9605 error ("typedef declared %<auto%>");
9606 type = error_mark_node;
9609 if (decl_context == FIELD)
9610 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9612 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9613 if (id_declarator && declarator->u.id.qualifying_scope) {
9614 error_at (DECL_SOURCE_LOCATION (decl),
9615 "typedef name may not be a nested-name-specifier");
9616 TREE_TYPE (decl) = error_mark_node;
9619 if (decl_context != FIELD)
9621 if (!current_function_decl)
9622 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9623 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9624 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9625 (current_function_decl)))
9626 /* The TYPE_DECL is "abstract" because there will be
9627 clones of this constructor/destructor, and there will
9628 be copies of this TYPE_DECL generated in those
9630 DECL_ABSTRACT (decl) = 1;
9632 else if (constructor_name_p (unqualified_id, current_class_type))
9633 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9634 "as enclosing class",
9637 /* If the user declares "typedef struct {...} foo" then the
9638 struct will have an anonymous name. Fill that name in now.
9639 Nothing can refer to it, so nothing needs know about the name
9641 if (type != error_mark_node
9644 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9645 && TYPE_ANONYMOUS_P (type)
9646 && declspecs->type_definition_p
9647 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9651 /* Replace the anonymous name with the real name everywhere. */
9652 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9654 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9655 /* We do not rename the debug info representing the
9656 anonymous tagged type because the standard says in
9657 [dcl.typedef] that the naming applies only for
9658 linkage purposes. */
9659 /*debug_hooks->set_name (t, decl);*/
9660 TYPE_NAME (t) = decl;
9663 if (TYPE_LANG_SPECIFIC (type))
9664 TYPE_WAS_ANONYMOUS (type) = 1;
9666 /* If this is a typedef within a template class, the nested
9667 type is a (non-primary) template. The name for the
9668 template needs updating as well. */
9669 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9670 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9671 = TYPE_IDENTIFIER (type);
9673 /* Adjust linkage now that we aren't anonymous anymore. */
9674 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9675 determine_visibility (TYPE_MAIN_DECL (type));
9677 /* FIXME remangle member functions; member functions of a
9678 type with external linkage have external linkage. */
9682 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9683 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9685 bad_specifiers (decl, BSP_TYPE, virtualp,
9686 memfn_quals != TYPE_UNQUALIFIED,
9687 inlinep, friendp, raises != NULL_TREE);
9692 /* Detect the case of an array type of unspecified size
9693 which came, as such, direct from a typedef name.
9694 We must copy the type, so that the array's domain can be
9695 individually set by the object's initializer. */
9697 if (type && typedef_type
9698 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9699 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9700 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9702 /* Detect where we're using a typedef of function type to declare a
9703 function. PARMS will not be set, so we must create it now. */
9705 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9707 tree decls = NULL_TREE;
9710 for (args = TYPE_ARG_TYPES (type);
9711 args && args != void_list_node;
9712 args = TREE_CHAIN (args))
9714 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9716 DECL_CHAIN (decl) = decls;
9720 parms = nreverse (decls);
9722 if (decl_context != TYPENAME)
9724 /* A cv-qualifier-seq shall only be part of the function type
9725 for a non-static member function. [8.3.5/4 dcl.fct] */
9726 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9727 && (current_class_type == NULL_TREE || staticp) )
9730 ? G_("qualified function types cannot be used to "
9731 "declare static member functions")
9732 : G_("qualified function types cannot be used to "
9733 "declare free functions"));
9734 type = TYPE_MAIN_VARIANT (type);
9737 /* The qualifiers on the function type become the qualifiers on
9738 the non-static member function. */
9739 memfn_quals |= type_memfn_quals (type);
9740 type_quals = TYPE_UNQUALIFIED;
9744 /* If this is a type name (such as, in a cast or sizeof),
9745 compute the type and return it now. */
9747 if (decl_context == TYPENAME)
9749 /* Note that the grammar rejects storage classes
9750 in typenames, fields or parameters. */
9751 if (type_quals != TYPE_UNQUALIFIED)
9752 type_quals = TYPE_UNQUALIFIED;
9754 /* Special case: "friend class foo" looks like a TYPENAME context. */
9757 if (type_quals != TYPE_UNQUALIFIED)
9759 error ("type qualifiers specified for friend class declaration");
9760 type_quals = TYPE_UNQUALIFIED;
9764 error ("%<inline%> specified for friend class declaration");
9770 /* Don't allow friend declaration without a class-key. */
9771 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9772 permerror (input_location, "template parameters cannot be friends");
9773 else if (TREE_CODE (type) == TYPENAME_TYPE)
9774 permerror (input_location, "friend declaration requires class-key, "
9775 "i.e. %<friend class %T::%D%>",
9776 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9778 permerror (input_location, "friend declaration requires class-key, "
9779 "i.e. %<friend %#T%>",
9783 /* Only try to do this stuff if we didn't already give up. */
9784 if (type != integer_type_node)
9786 /* A friendly class? */
9787 if (current_class_type)
9788 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9791 error ("trying to make class %qT a friend of global scope",
9794 type = void_type_node;
9797 else if (memfn_quals)
9799 if (ctype == NULL_TREE
9800 && TREE_CODE (type) == METHOD_TYPE)
9801 ctype = TYPE_METHOD_BASETYPE (type);
9804 type = build_memfn_type (type, ctype, memfn_quals);
9805 /* Core issue #547: need to allow this in template type args. */
9806 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9807 type = apply_memfn_quals (type, memfn_quals);
9809 error ("invalid qualifiers on non-member function type");
9814 else if (unqualified_id == NULL_TREE && decl_context != PARM
9815 && decl_context != CATCHPARM
9816 && TREE_CODE (type) != UNION_TYPE
9819 error ("abstract declarator %qT used as declaration", type);
9820 return error_mark_node;
9823 /* Only functions may be declared using an operator-function-id. */
9825 && IDENTIFIER_OPNAME_P (unqualified_id)
9826 && TREE_CODE (type) != FUNCTION_TYPE
9827 && TREE_CODE (type) != METHOD_TYPE)
9829 error ("declaration of %qD as non-function", unqualified_id);
9830 return error_mark_node;
9833 /* We don't check parameter types here because we can emit a better
9834 error message later. */
9835 if (decl_context != PARM)
9837 type = check_var_type (unqualified_id, type);
9838 if (type == error_mark_node)
9839 return error_mark_node;
9842 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9843 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9845 if (decl_context == PARM || decl_context == CATCHPARM)
9847 if (ctype || in_namespace)
9848 error ("cannot use %<::%> in parameter declaration");
9850 if (type_uses_auto (type))
9852 error ("parameter declared %<auto%>");
9853 type = error_mark_node;
9856 /* A parameter declared as an array of T is really a pointer to T.
9857 One declared as a function is really a pointer to a function.
9858 One declared as a member is really a pointer to member. */
9860 if (TREE_CODE (type) == ARRAY_TYPE)
9862 /* Transfer const-ness of array into that of type pointed to. */
9863 type = build_pointer_type (TREE_TYPE (type));
9864 type_quals = TYPE_UNQUALIFIED;
9866 else if (TREE_CODE (type) == FUNCTION_TYPE)
9867 type = build_pointer_type (type);
9870 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9871 && !NEW_DELETE_OPNAME_P (unqualified_id))
9873 cp_cv_quals real_quals = memfn_quals;
9874 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9875 real_quals |= TYPE_QUAL_CONST;
9876 type = build_memfn_type (type, ctype, real_quals);
9882 if (decl_context == PARM)
9884 decl = cp_build_parm_decl (unqualified_id, type);
9886 bad_specifiers (decl, BSP_PARM, virtualp,
9887 memfn_quals != TYPE_UNQUALIFIED,
9888 inlinep, friendp, raises != NULL_TREE);
9890 else if (decl_context == FIELD)
9892 /* The C99 flexible array extension. */
9893 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9894 && TYPE_DOMAIN (type) == NULL_TREE)
9896 tree itype = compute_array_index_type (dname, integer_zero_node,
9897 tf_warning_or_error);
9898 type = build_cplus_array_type (TREE_TYPE (type), itype);
9901 if (type == error_mark_node)
9903 /* Happens when declaring arrays of sizes which
9904 are error_mark_node, for example. */
9907 else if (in_namespace && !friendp)
9909 /* Something like struct S { int N::j; }; */
9910 error ("invalid use of %<::%>");
9911 return error_mark_node;
9913 else if (TREE_CODE (type) == FUNCTION_TYPE
9914 || TREE_CODE (type) == METHOD_TYPE)
9917 tree function_context;
9921 /* This should never happen in pure C++ (the check
9922 could be an assert). It could happen in
9923 Objective-C++ if someone writes invalid code that
9924 uses a function declaration for an instance
9925 variable or property (instance variables and
9926 properties are parsed as FIELD_DECLs, but they are
9927 part of an Objective-C class, not a C++ class).
9928 That code is invalid and is caught by this
9932 error ("declaration of function %qD in invalid context",
9934 return error_mark_node;
9937 /* ``A union may [ ... ] not [ have ] virtual functions.''
9939 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9941 error ("function %qD declared virtual inside a union",
9943 return error_mark_node;
9946 if (NEW_DELETE_OPNAME_P (unqualified_id))
9950 error ("%qD cannot be declared virtual, since it "
9958 /* Check that the name used for a destructor makes sense. */
9959 if (sfk == sfk_destructor)
9961 tree uqname = id_declarator->u.id.unqualified_name;
9965 gcc_assert (friendp);
9966 error ("expected qualified name in friend declaration "
9967 "for destructor %qD", uqname);
9968 return error_mark_node;
9971 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9973 error ("declaration of %qD as member of %qT",
9975 return error_mark_node;
9979 error ("a destructor cannot be %<constexpr%>");
9980 return error_mark_node;
9983 else if (sfk == sfk_constructor && friendp && !ctype)
9985 error ("expected qualified name in friend declaration "
9986 "for constructor %qD",
9987 id_declarator->u.id.unqualified_name);
9988 return error_mark_node;
9991 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9992 function_context = (ctype != NULL_TREE) ?
9993 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9994 publicp = (! friendp || ! staticp)
9995 && function_context == NULL_TREE;
9996 decl = grokfndecl (ctype, type,
9997 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9998 ? unqualified_id : dname,
10001 virtualp, flags, memfn_quals, raises,
10002 friendp ? -1 : 0, friendp, publicp,
10003 inlinep | (2 * constexpr_p),
10005 funcdef_flag, template_count, in_namespace,
10006 attrlist, declarator->id_loc);
10007 decl = set_virt_specifiers (decl, virt_specifiers);
10008 if (decl == NULL_TREE)
10009 return error_mark_node;
10011 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10012 /* The decl and setting of decl_attr is also turned off. */
10013 decl = build_decl_attribute_variant (decl, decl_attr);
10016 /* [class.conv.ctor]
10018 A constructor declared without the function-specifier
10019 explicit that can be called with a single parameter
10020 specifies a conversion from the type of its first
10021 parameter to the type of its class. Such a constructor
10022 is called a converting constructor. */
10023 if (explicitp == 2)
10024 DECL_NONCONVERTING_P (decl) = 1;
10026 else if (!staticp && !dependent_type_p (type)
10027 && !COMPLETE_TYPE_P (complete_type (type))
10028 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10030 if (unqualified_id)
10031 error ("field %qD has incomplete type", unqualified_id);
10033 error ("name %qT has incomplete type", type);
10035 /* If we're instantiating a template, tell them which
10036 instantiation made the field's type be incomplete. */
10037 if (current_class_type
10038 && TYPE_NAME (current_class_type)
10039 && IDENTIFIER_TEMPLATE (current_class_name)
10041 && declspecs->type == type)
10042 error (" in instantiation of template %qT",
10043 current_class_type);
10045 return error_mark_node;
10051 error ("%qE is neither function nor member function; "
10052 "cannot be declared friend", unqualified_id);
10060 /* Friends are treated specially. */
10061 if (ctype == current_class_type)
10062 ; /* We already issued a permerror. */
10063 else if (decl && DECL_NAME (decl))
10065 if (template_class_depth (current_class_type) == 0)
10067 decl = check_explicit_specialization
10068 (unqualified_id, decl, template_count,
10069 2 * funcdef_flag + 4);
10070 if (decl == error_mark_node)
10071 return error_mark_node;
10074 decl = do_friend (ctype, unqualified_id, decl,
10080 return error_mark_node;
10083 /* Structure field. It may not be a function, except for C++. */
10085 if (decl == NULL_TREE)
10091 /* An attempt is being made to initialize a non-static
10092 member. But, from [class.mem]:
10094 4 A member-declarator can contain a
10095 constant-initializer only if it declares a static
10096 member (_class.static_) of integral or enumeration
10097 type, see _class.static.data_.
10099 This used to be relatively common practice, but
10100 the rest of the compiler does not correctly
10101 handle the initialization unless the member is
10102 static so we make it static below. */
10103 if (cxx_dialect >= cxx0x)
10105 sorry ("non-static data member initializers");
10109 permerror (input_location, "ISO C++ forbids initialization of member %qD",
10111 permerror (input_location, "making %qD static", unqualified_id);
10119 /* C++ allows static class members. All other work
10120 for this is done by grokfield. */
10121 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10122 set_linkage_for_static_data_member (decl);
10123 /* Even if there is an in-class initialization, DECL
10124 is considered undefined until an out-of-class
10125 definition is provided. */
10126 DECL_EXTERNAL (decl) = 1;
10129 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10131 if (constexpr_p && !initialized)
10133 error ("constexpr static data member %qD must have an "
10134 "initializer", decl);
10135 constexpr_p = false;
10142 error ("non-static data member %qE declared %<constexpr%>",
10144 constexpr_p = false;
10146 decl = build_decl (input_location,
10147 FIELD_DECL, unqualified_id, type);
10148 DECL_NONADDRESSABLE_P (decl) = bitfield;
10149 if (bitfield && !unqualified_id)
10150 TREE_NO_WARNING (decl) = 1;
10152 if (storage_class == sc_mutable)
10154 DECL_MUTABLE_P (decl) = 1;
10155 storage_class = sc_none;
10159 bad_specifiers (decl, BSP_FIELD, virtualp,
10160 memfn_quals != TYPE_UNQUALIFIED,
10161 inlinep, friendp, raises != NULL_TREE);
10164 else if (TREE_CODE (type) == FUNCTION_TYPE
10165 || TREE_CODE (type) == METHOD_TYPE)
10167 tree original_name;
10170 if (!unqualified_id)
10171 return error_mark_node;
10173 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10174 original_name = dname;
10176 original_name = unqualified_id;
10178 if (storage_class == sc_auto)
10179 error ("storage class %<auto%> invalid for function %qs", name);
10180 else if (storage_class == sc_register)
10181 error ("storage class %<register%> invalid for function %qs", name);
10183 error ("storage class %<__thread%> invalid for function %qs", name);
10185 if (virt_specifiers)
10186 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10187 /* Function declaration not at top level.
10188 Storage classes other than `extern' are not allowed
10189 and `extern' makes no difference. */
10190 if (! toplevel_bindings_p ()
10191 && (storage_class == sc_static
10192 || declspecs->specs[(int)ds_inline])
10195 if (storage_class == sc_static)
10196 pedwarn (input_location, OPT_pedantic,
10197 "%<static%> specified invalid for function %qs "
10198 "declared out of global scope", name);
10200 pedwarn (input_location, OPT_pedantic,
10201 "%<inline%> specifier invalid for function %qs "
10202 "declared out of global scope", name);
10205 if (ctype == NULL_TREE)
10209 error ("virtual non-class function %qs", name);
10212 else if (sfk == sfk_constructor
10213 || sfk == sfk_destructor)
10215 error (funcdef_flag
10216 ? "%qs defined in a non-class scope"
10217 : "%qs declared in a non-class scope", name);
10222 /* Record presence of `static'. */
10223 publicp = (ctype != NULL_TREE
10224 || storage_class == sc_extern
10225 || storage_class != sc_static);
10227 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10228 virtualp, flags, memfn_quals, raises,
10230 publicp, inlinep | (2 * constexpr_p), sfk,
10232 template_count, in_namespace, attrlist,
10233 declarator->id_loc);
10234 if (decl == NULL_TREE)
10235 return error_mark_node;
10239 int invalid_static = 0;
10241 /* Don't allow a static member function in a class, and forbid
10242 declaring main to be static. */
10243 if (TREE_CODE (type) == METHOD_TYPE)
10245 permerror (input_location, "cannot declare member function %qD to have "
10246 "static linkage", decl);
10247 invalid_static = 1;
10249 else if (current_function_decl)
10251 /* FIXME need arm citation */
10252 error ("cannot declare static function inside another function");
10253 invalid_static = 1;
10256 if (invalid_static)
10259 storage_class = sc_none;
10265 /* It's a variable. */
10267 /* An uninitialized decl with `extern' is a reference. */
10268 decl = grokvardecl (type, unqualified_id,
10271 (type_quals & TYPE_QUAL_CONST) != 0,
10272 ctype ? ctype : in_namespace);
10273 bad_specifiers (decl, BSP_VAR, virtualp,
10274 memfn_quals != TYPE_UNQUALIFIED,
10275 inlinep, friendp, raises != NULL_TREE);
10279 DECL_CONTEXT (decl) = ctype;
10282 permerror (input_location, "%<static%> may not be used when defining "
10283 "(as opposed to declaring) a static data member");
10285 storage_class = sc_none;
10287 if (storage_class == sc_register && TREE_STATIC (decl))
10289 error ("static member %qD declared %<register%>", decl);
10290 storage_class = sc_none;
10292 if (storage_class == sc_extern && pedantic)
10294 pedwarn (input_location, OPT_pedantic,
10295 "cannot explicitly declare member %q#D to have "
10296 "extern linkage", decl);
10297 storage_class = sc_none;
10300 else if (constexpr_p && DECL_EXTERNAL (decl))
10302 error ("declaration of constexpr variable %qD is not a definition",
10304 constexpr_p = false;
10308 if (storage_class == sc_extern && initialized && !funcdef_flag)
10310 if (toplevel_bindings_p ())
10312 /* It's common practice (and completely valid) to have a const
10313 be initialized and declared extern. */
10314 if (!(type_quals & TYPE_QUAL_CONST))
10315 warning (0, "%qs initialized and declared %<extern%>", name);
10319 error ("%qs has both %<extern%> and initializer", name);
10320 return error_mark_node;
10324 /* Record `register' declaration for warnings on &
10325 and in case doing stupid register allocation. */
10327 if (storage_class == sc_register)
10328 DECL_REGISTER (decl) = 1;
10329 else if (storage_class == sc_extern)
10330 DECL_THIS_EXTERN (decl) = 1;
10331 else if (storage_class == sc_static)
10332 DECL_THIS_STATIC (decl) = 1;
10334 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10335 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10336 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10338 /* Record constancy and volatility on the DECL itself . There's
10339 no need to do this when processing a template; we'll do this
10340 for the instantiated declaration based on the type of DECL. */
10341 if (!processing_template_decl)
10342 cp_apply_type_quals_to_decl (type_quals, decl);
10348 /* Subroutine of start_function. Ensure that each of the parameter
10349 types (as listed in PARMS) is complete, as is required for a
10350 function definition. */
10353 require_complete_types_for_parms (tree parms)
10355 for (; parms; parms = DECL_CHAIN (parms))
10357 if (dependent_type_p (TREE_TYPE (parms)))
10359 if (!VOID_TYPE_P (TREE_TYPE (parms))
10360 && complete_type_or_else (TREE_TYPE (parms), parms))
10362 relayout_decl (parms);
10363 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10366 /* grokparms or complete_type_or_else will have already issued
10368 TREE_TYPE (parms) = error_mark_node;
10372 /* Returns nonzero if T is a local variable. */
10375 local_variable_p (const_tree t)
10377 if ((TREE_CODE (t) == VAR_DECL
10378 /* A VAR_DECL with a context that is a _TYPE is a static data
10380 && !TYPE_P (CP_DECL_CONTEXT (t))
10381 /* Any other non-local variable must be at namespace scope. */
10382 && !DECL_NAMESPACE_SCOPE_P (t))
10383 || (TREE_CODE (t) == PARM_DECL))
10389 /* Like local_variable_p, but suitable for use as a tree-walking
10393 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10394 void *data ATTRIBUTE_UNUSED)
10396 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10398 else if (TYPE_P (*tp))
10399 *walk_subtrees = 0;
10405 /* Check that ARG, which is a default-argument expression for a
10406 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10407 something goes wrong. DECL may also be a _TYPE node, rather than a
10408 DECL, if there is no DECL available. */
10411 check_default_argument (tree decl, tree arg)
10416 if (TREE_CODE (arg) == DEFAULT_ARG)
10417 /* We get a DEFAULT_ARG when looking at an in-class declaration
10418 with a default argument. Ignore the argument for now; we'll
10419 deal with it after the class is complete. */
10428 decl_type = TREE_TYPE (decl);
10430 if (arg == error_mark_node
10431 || decl == error_mark_node
10432 || TREE_TYPE (arg) == error_mark_node
10433 || decl_type == error_mark_node)
10434 /* Something already went wrong. There's no need to check
10436 return error_mark_node;
10438 /* [dcl.fct.default]
10440 A default argument expression is implicitly converted to the
10442 if (!TREE_TYPE (arg)
10443 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10446 error ("default argument for %q#D has type %qT",
10447 decl, TREE_TYPE (arg));
10449 error ("default argument for parameter of type %qT has type %qT",
10450 decl_type, TREE_TYPE (arg));
10452 return error_mark_node;
10455 /* [dcl.fct.default]
10457 Local variables shall not be used in default argument
10460 The keyword `this' shall not be used in a default argument of a
10461 member function. */
10462 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10465 error ("default argument %qE uses local variable %qD", arg, var);
10466 return error_mark_node;
10473 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10476 type_is_deprecated (tree type)
10478 enum tree_code code;
10479 if (TREE_DEPRECATED (type))
10481 if (TYPE_NAME (type)
10482 && TREE_DEPRECATED (TYPE_NAME (type)))
10485 /* Do warn about using typedefs to a deprecated class. */
10486 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10487 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10489 code = TREE_CODE (type);
10491 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10492 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10493 || code == METHOD_TYPE || code == ARRAY_TYPE)
10494 return type_is_deprecated (TREE_TYPE (type));
10496 if (TYPE_PTRMEMFUNC_P (type))
10497 return type_is_deprecated
10498 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10503 /* Decode the list of parameter types for a function type.
10504 Given the list of things declared inside the parens,
10505 return a list of types.
10507 If this parameter does not end with an ellipsis, we append
10510 *PARMS is set to the chain of PARM_DECLs created. */
10513 grokparms (tree parmlist, tree *parms)
10515 tree result = NULL_TREE;
10516 tree decls = NULL_TREE;
10520 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10522 tree type = NULL_TREE;
10523 tree init = TREE_PURPOSE (parm);
10524 tree decl = TREE_VALUE (parm);
10525 const char *errmsg;
10527 if (parm == void_list_node)
10530 if (! decl || TREE_TYPE (decl) == error_mark_node)
10533 type = TREE_TYPE (decl);
10534 if (VOID_TYPE_P (type))
10536 if (same_type_p (type, void_type_node)
10537 && DECL_SELF_REFERENCE_P (type)
10538 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10539 /* this is a parmlist of `(void)', which is ok. */
10541 cxx_incomplete_type_error (decl, type);
10542 /* It's not a good idea to actually create parameters of
10543 type `void'; other parts of the compiler assume that a
10544 void type terminates the parameter list. */
10545 type = error_mark_node;
10546 TREE_TYPE (decl) = error_mark_node;
10549 if (type != error_mark_node
10550 && TYPE_FOR_JAVA (type)
10551 && MAYBE_CLASS_TYPE_P (type))
10553 error ("parameter %qD has Java class type", decl);
10554 type = error_mark_node;
10555 TREE_TYPE (decl) = error_mark_node;
10559 if (type != error_mark_node
10560 && (errmsg = targetm.invalid_parameter_type (type)))
10563 type = error_mark_node;
10564 TREE_TYPE (decl) = error_mark_node;
10567 if (type != error_mark_node)
10569 if (deprecated_state != DEPRECATED_SUPPRESS)
10571 tree deptype = type_is_deprecated (type);
10573 warn_deprecated_use (deptype, NULL_TREE);
10576 /* Top-level qualifiers on the parameters are
10577 ignored for function types. */
10578 type = cp_build_qualified_type (type, 0);
10579 if (TREE_CODE (type) == METHOD_TYPE)
10581 error ("parameter %qD invalidly declared method type", decl);
10582 type = build_pointer_type (type);
10583 TREE_TYPE (decl) = type;
10585 else if (abstract_virtuals_error (decl, type))
10586 any_error = 1; /* Seems like a good idea. */
10587 else if (POINTER_TYPE_P (type))
10589 /* [dcl.fct]/6, parameter types cannot contain pointers
10590 (references) to arrays of unknown bound. */
10591 tree t = TREE_TYPE (type);
10592 int ptr = TYPE_PTR_P (type);
10596 if (TYPE_PTR_P (t))
10598 else if (TREE_CODE (t) != ARRAY_TYPE)
10600 else if (!TYPE_DOMAIN (t))
10604 if (TREE_CODE (t) == ARRAY_TYPE)
10606 ? G_("parameter %qD includes pointer to array of "
10607 "unknown bound %qT")
10608 : G_("parameter %qD includes reference to array of "
10609 "unknown bound %qT"),
10615 else if (init && !processing_template_decl)
10616 init = check_default_argument (decl, init);
10619 DECL_CHAIN (decl) = decls;
10621 result = tree_cons (init, type, result);
10623 decls = nreverse (decls);
10624 result = nreverse (result);
10626 result = chainon (result, void_list_node);
10633 /* D is a constructor or overloaded `operator='.
10635 Let T be the class in which D is declared. Then, this function
10638 -1 if D's is an ill-formed constructor or copy assignment operator
10639 whose first parameter is of type `T'.
10640 0 if D is not a copy constructor or copy assignment
10642 1 if D is a copy constructor or copy assignment operator whose
10643 first parameter is a reference to non-const qualified T.
10644 2 if D is a copy constructor or copy assignment operator whose
10645 first parameter is a reference to const qualified T.
10647 This function can be used as a predicate. Positive values indicate
10648 a copy constructor and nonzero values indicate a copy assignment
10652 copy_fn_p (const_tree d)
10658 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10660 if (TREE_CODE (d) == TEMPLATE_DECL
10661 || (DECL_TEMPLATE_INFO (d)
10662 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10663 /* Instantiations of template member functions are never copy
10664 functions. Note that member functions of templated classes are
10665 represented as template functions internally, and we must
10666 accept those as copy functions. */
10669 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10673 arg_type = TREE_VALUE (args);
10674 if (arg_type == error_mark_node)
10677 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10679 /* Pass by value copy assignment operator. */
10682 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10683 && !TYPE_REF_IS_RVALUE (arg_type)
10684 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10686 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10692 args = TREE_CHAIN (args);
10694 if (args && args != void_list_node && !TREE_PURPOSE (args))
10695 /* There are more non-optional args. */
10701 /* D is a constructor or overloaded `operator='.
10703 Let T be the class in which D is declared. Then, this function
10704 returns true when D is a move constructor or move assignment
10705 operator, false otherwise. */
10708 move_fn_p (const_tree d)
10712 bool result = false;
10714 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10716 if (cxx_dialect == cxx98)
10717 /* There are no move constructors if we are in C++98 mode. */
10720 if (TREE_CODE (d) == TEMPLATE_DECL
10721 || (DECL_TEMPLATE_INFO (d)
10722 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10723 /* Instantiations of template member functions are never copy
10724 functions. Note that member functions of templated classes are
10725 represented as template functions internally, and we must
10726 accept those as copy functions. */
10729 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10733 arg_type = TREE_VALUE (args);
10734 if (arg_type == error_mark_node)
10737 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10738 && TYPE_REF_IS_RVALUE (arg_type)
10739 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10743 args = TREE_CHAIN (args);
10745 if (args && args != void_list_node && !TREE_PURPOSE (args))
10746 /* There are more non-optional args. */
10752 /* Remember any special properties of member function DECL. */
10755 grok_special_member_properties (tree decl)
10759 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10762 class_type = DECL_CONTEXT (decl);
10763 if (DECL_CONSTRUCTOR_P (decl))
10765 int ctor = copy_fn_p (decl);
10767 if (!DECL_ARTIFICIAL (decl))
10768 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10774 A non-template constructor for class X is a copy
10775 constructor if its first parameter is of type X&, const
10776 X&, volatile X& or const volatile X&, and either there
10777 are no other parameters or else all other parameters have
10778 default arguments. */
10779 TYPE_HAS_COPY_CTOR (class_type) = 1;
10780 if (user_provided_p (decl))
10781 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10783 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10785 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10787 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10788 if (user_provided_p (decl))
10789 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10791 else if (move_fn_p (decl) && user_provided_p (decl))
10792 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10793 else if (is_list_ctor (decl))
10794 TYPE_HAS_LIST_CTOR (class_type) = 1;
10796 if (DECL_DECLARED_CONSTEXPR_P (decl)
10797 && !copy_fn_p (decl) && !move_fn_p (decl))
10798 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10800 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10804 A non-template assignment operator for class X is a copy
10805 assignment operator if its parameter is of type X, X&, const
10806 X&, volatile X& or const volatile X&. */
10808 int assop = copy_fn_p (decl);
10812 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10813 if (user_provided_p (decl))
10814 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10816 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10818 else if (move_fn_p (decl) && user_provided_p (decl))
10819 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10821 /* Destructors are handled in check_methods. */
10824 /* Check a constructor DECL has the correct form. Complains
10825 if the class has a constructor of the form X(X). */
10828 grok_ctor_properties (const_tree ctype, const_tree decl)
10830 int ctor_parm = copy_fn_p (decl);
10836 A declaration of a constructor for a class X is ill-formed if
10837 its first parameter is of type (optionally cv-qualified) X
10838 and either there are no other parameters or else all other
10839 parameters have default arguments.
10841 We *don't* complain about member template instantiations that
10842 have this form, though; they can occur as we try to decide
10843 what constructor to use during overload resolution. Since
10844 overload resolution will never prefer such a constructor to
10845 the non-template copy constructor (which is either explicitly
10846 or implicitly defined), there's no need to worry about their
10847 existence. Theoretically, they should never even be
10848 instantiated, but that's hard to forestall. */
10849 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10857 /* An operator with this code is unary, but can also be binary. */
10860 ambi_op_p (enum tree_code code)
10862 return (code == INDIRECT_REF
10863 || code == ADDR_EXPR
10864 || code == UNARY_PLUS_EXPR
10865 || code == NEGATE_EXPR
10866 || code == PREINCREMENT_EXPR
10867 || code == PREDECREMENT_EXPR);
10870 /* An operator with this name can only be unary. */
10873 unary_op_p (enum tree_code code)
10875 return (code == TRUTH_NOT_EXPR
10876 || code == BIT_NOT_EXPR
10877 || code == COMPONENT_REF
10878 || code == TYPE_EXPR);
10881 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10882 errors are issued for invalid declarations. */
10885 grok_op_properties (tree decl, bool complain)
10887 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10889 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10890 tree name = DECL_NAME (decl);
10891 enum tree_code operator_code;
10896 /* Count the number of arguments and check for ellipsis. */
10897 for (argtype = argtypes, arity = 0;
10898 argtype && argtype != void_list_node;
10899 argtype = TREE_CHAIN (argtype))
10901 ellipsis_p = !argtype;
10903 class_type = DECL_CONTEXT (decl);
10904 if (class_type && !CLASS_TYPE_P (class_type))
10905 class_type = NULL_TREE;
10907 if (DECL_CONV_FN_P (decl))
10908 operator_code = TYPE_EXPR;
10912 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10913 if (ansi_opname (CODE) == name) \
10915 operator_code = (CODE); \
10918 else if (ansi_assopname (CODE) == name) \
10920 operator_code = (CODE); \
10921 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10925 #include "operators.def"
10926 #undef DEF_OPERATOR
10928 gcc_unreachable ();
10931 gcc_assert (operator_code != MAX_TREE_CODES);
10932 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10935 switch (operator_code)
10938 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10942 TYPE_GETS_DELETE (class_type) |= 1;
10946 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10949 case VEC_DELETE_EXPR:
10950 TYPE_GETS_DELETE (class_type) |= 2;
10957 /* [basic.std.dynamic.allocation]/1:
10959 A program is ill-formed if an allocation function is declared
10960 in a namespace scope other than global scope or declared static
10963 The same also holds true for deallocation functions. */
10964 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10965 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10967 if (DECL_NAMESPACE_SCOPE_P (decl))
10969 if (CP_DECL_CONTEXT (decl) != global_namespace)
10971 error ("%qD may not be declared within a namespace", decl);
10974 else if (!TREE_PUBLIC (decl))
10976 error ("%qD may not be declared as static", decl);
10982 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10984 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10985 DECL_IS_OPERATOR_NEW (decl) = 1;
10987 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10988 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10991 /* An operator function must either be a non-static member function
10992 or have at least one parameter of a class, a reference to a class,
10993 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10994 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10996 if (operator_code == TYPE_EXPR
10997 || operator_code == CALL_EXPR
10998 || operator_code == COMPONENT_REF
10999 || operator_code == ARRAY_REF
11000 || operator_code == NOP_EXPR)
11002 error ("%qD must be a nonstatic member function", decl);
11009 if (DECL_STATIC_FUNCTION_P (decl))
11011 error ("%qD must be either a non-static member "
11012 "function or a non-member function", decl);
11016 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11018 tree arg = non_reference (TREE_VALUE (p));
11019 if (arg == error_mark_node)
11022 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11023 because these checks are performed even on
11024 template functions. */
11025 if (MAYBE_CLASS_TYPE_P (arg)
11026 || TREE_CODE (arg) == ENUMERAL_TYPE)
11030 if (!p || p == void_list_node)
11033 error ("%qD must have an argument of class or "
11034 "enumerated type", decl);
11040 /* There are no restrictions on the arguments to an overloaded
11042 if (operator_code == CALL_EXPR)
11045 /* Warn about conversion operators that will never be used. */
11046 if (IDENTIFIER_TYPENAME_P (name)
11047 && ! DECL_TEMPLATE_INFO (decl)
11049 /* Warn only declaring the function; there is no need to
11050 warn again about out-of-class definitions. */
11051 && class_type == current_class_type)
11053 tree t = TREE_TYPE (name);
11054 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11057 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11059 if (TREE_CODE (t) == VOID_TYPE)
11060 warning (OPT_Wconversion,
11062 ? G_("conversion to a reference to void "
11063 "will never use a type conversion operator")
11064 : G_("conversion to void "
11065 "will never use a type conversion operator"));
11066 else if (class_type)
11068 if (t == class_type)
11069 warning (OPT_Wconversion,
11071 ? G_("conversion to a reference to the same type "
11072 "will never use a type conversion operator")
11073 : G_("conversion to the same type "
11074 "will never use a type conversion operator"));
11075 /* Don't force t to be complete here. */
11076 else if (MAYBE_CLASS_TYPE_P (t)
11077 && COMPLETE_TYPE_P (t)
11078 && DERIVED_FROM_P (t, class_type))
11079 warning (OPT_Wconversion,
11081 ? G_("conversion to a reference to a base class "
11082 "will never use a type conversion operator")
11083 : G_("conversion to a base class "
11084 "will never use a type conversion operator"));
11089 if (operator_code == COND_EXPR)
11092 error ("ISO C++ prohibits overloading operator ?:");
11095 else if (ellipsis_p)
11097 error ("%qD must not have variable number of arguments", decl);
11100 else if (ambi_op_p (operator_code))
11103 /* We pick the one-argument operator codes by default, so
11104 we don't have to change anything. */
11106 else if (arity == 2)
11108 /* If we thought this was a unary operator, we now know
11109 it to be a binary operator. */
11110 switch (operator_code)
11113 operator_code = MULT_EXPR;
11117 operator_code = BIT_AND_EXPR;
11120 case UNARY_PLUS_EXPR:
11121 operator_code = PLUS_EXPR;
11125 operator_code = MINUS_EXPR;
11128 case PREINCREMENT_EXPR:
11129 operator_code = POSTINCREMENT_EXPR;
11132 case PREDECREMENT_EXPR:
11133 operator_code = POSTDECREMENT_EXPR;
11137 gcc_unreachable ();
11140 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11142 if ((operator_code == POSTINCREMENT_EXPR
11143 || operator_code == POSTDECREMENT_EXPR)
11144 && ! processing_template_decl
11145 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11148 error ("postfix %qD must take %<int%> as its argument",
11151 error ("postfix %qD must take %<int%> as its second "
11159 error ("%qD must take either zero or one argument", decl);
11161 error ("%qD must take either one or two arguments", decl);
11165 /* More Effective C++ rule 6. */
11167 && (operator_code == POSTINCREMENT_EXPR
11168 || operator_code == POSTDECREMENT_EXPR
11169 || operator_code == PREINCREMENT_EXPR
11170 || operator_code == PREDECREMENT_EXPR))
11172 tree arg = TREE_VALUE (argtypes);
11173 tree ret = TREE_TYPE (TREE_TYPE (decl));
11174 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11175 arg = TREE_TYPE (arg);
11176 arg = TYPE_MAIN_VARIANT (arg);
11177 if (operator_code == PREINCREMENT_EXPR
11178 || operator_code == PREDECREMENT_EXPR)
11180 if (TREE_CODE (ret) != REFERENCE_TYPE
11181 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11183 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11184 build_reference_type (arg));
11188 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11189 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11193 else if (unary_op_p (operator_code))
11198 error ("%qD must take %<void%>", decl);
11200 error ("%qD must take exactly one argument", decl);
11204 else /* if (binary_op_p (operator_code)) */
11209 error ("%qD must take exactly one argument", decl);
11211 error ("%qD must take exactly two arguments", decl);
11215 /* More Effective C++ rule 7. */
11217 && (operator_code == TRUTH_ANDIF_EXPR
11218 || operator_code == TRUTH_ORIF_EXPR
11219 || operator_code == COMPOUND_EXPR))
11220 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11224 /* Effective C++ rule 23. */
11227 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11228 && (operator_code == PLUS_EXPR
11229 || operator_code == MINUS_EXPR
11230 || operator_code == TRUNC_DIV_EXPR
11231 || operator_code == MULT_EXPR
11232 || operator_code == TRUNC_MOD_EXPR)
11233 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11234 warning (OPT_Weffc__, "%qD should return by value", decl);
11236 /* [over.oper]/8 */
11237 for (; argtypes && argtypes != void_list_node;
11238 argtypes = TREE_CHAIN (argtypes))
11239 if (TREE_PURPOSE (argtypes))
11241 TREE_PURPOSE (argtypes) = NULL_TREE;
11242 if (operator_code == POSTINCREMENT_EXPR
11243 || operator_code == POSTDECREMENT_EXPR)
11245 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11250 error ("%qD cannot have default arguments", decl);
11258 /* Return a string giving the keyword associate with CODE. */
11260 static const char *
11261 tag_name (enum tag_types code)
11273 case typename_type:
11276 gcc_unreachable ();
11280 /* Name lookup in an elaborated-type-specifier (after the keyword
11281 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11282 elaborated-type-specifier is invalid, issue a diagnostic and return
11283 error_mark_node; otherwise, return the *_TYPE to which it referred.
11284 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11287 check_elaborated_type_specifier (enum tag_types tag_code,
11289 bool allow_template_p)
11295 struct S { struct S *p; };
11297 name lookup will find the TYPE_DECL for the implicit "S::S"
11298 typedef. Adjust for that here. */
11299 if (DECL_SELF_REFERENCE_P (decl))
11300 decl = TYPE_NAME (TREE_TYPE (decl));
11302 type = TREE_TYPE (decl);
11304 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11305 is false for this case as well. */
11306 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11308 error ("using template type parameter %qT after %qs",
11309 type, tag_name (tag_code));
11310 return error_mark_node;
11314 If the identifier resolves to a typedef-name or a template
11315 type-parameter, the elaborated-type-specifier is ill-formed.
11317 In other words, the only legitimate declaration to use in the
11318 elaborated type specifier is the implicit typedef created when
11319 the type is declared. */
11320 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11321 && !DECL_SELF_REFERENCE_P (decl)
11322 && tag_code != typename_type)
11324 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11325 error ("%q+D has a previous declaration here", decl);
11326 return error_mark_node;
11328 else if (TREE_CODE (type) != RECORD_TYPE
11329 && TREE_CODE (type) != UNION_TYPE
11330 && tag_code != enum_type
11331 && tag_code != typename_type)
11333 error ("%qT referred to as %qs", type, tag_name (tag_code));
11334 error ("%q+T has a previous declaration here", type);
11335 return error_mark_node;
11337 else if (TREE_CODE (type) != ENUMERAL_TYPE
11338 && tag_code == enum_type)
11340 error ("%qT referred to as enum", type);
11341 error ("%q+T has a previous declaration here", type);
11342 return error_mark_node;
11344 else if (!allow_template_p
11345 && TREE_CODE (type) == RECORD_TYPE
11346 && CLASSTYPE_IS_TEMPLATE (type))
11348 /* If a class template appears as elaborated type specifier
11349 without a template header such as:
11351 template <class T> class C {};
11352 void f(class C); // No template header here
11354 then the required template argument is missing. */
11355 error ("template argument required for %<%s %T%>",
11356 tag_name (tag_code),
11357 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11358 return error_mark_node;
11364 /* Lookup NAME in elaborate type specifier in scope according to
11365 SCOPE and issue diagnostics if necessary.
11366 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11367 found, and ERROR_MARK_NODE for type error. */
11370 lookup_and_check_tag (enum tag_types tag_code, tree name,
11371 tag_scope scope, bool template_header_p)
11375 if (scope == ts_global)
11377 /* First try ordinary name lookup, ignoring hidden class name
11378 injected via friend declaration. */
11379 decl = lookup_name_prefer_type (name, 2);
11380 /* If that fails, the name will be placed in the smallest
11381 non-class, non-function-prototype scope according to 3.3.1/5.
11382 We may already have a hidden name declared as friend in this
11383 scope. So lookup again but not ignoring hidden names.
11384 If we find one, that name will be made visible rather than
11385 creating a new tag. */
11387 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11390 decl = lookup_type_scope (name, scope);
11392 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11393 decl = DECL_TEMPLATE_RESULT (decl);
11395 if (decl && TREE_CODE (decl) == TYPE_DECL)
11397 /* Look for invalid nested type:
11401 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11403 error ("%qD has the same name as the class in which it is "
11406 return error_mark_node;
11409 /* Two cases we need to consider when deciding if a class
11410 template is allowed as an elaborated type specifier:
11411 1. It is a self reference to its own class.
11412 2. It comes with a template header.
11416 template <class T> class C {
11417 class C *c1; // DECL_SELF_REFERENCE_P is true
11420 template <class U> class C; // template_header_p is true
11421 template <class T> class C<T>::D {
11422 class C *c2; // DECL_SELF_REFERENCE_P is true
11425 t = check_elaborated_type_specifier (tag_code,
11428 | DECL_SELF_REFERENCE_P (decl));
11431 else if (decl && TREE_CODE (decl) == TREE_LIST)
11433 error ("reference to %qD is ambiguous", name);
11434 print_candidates (decl);
11435 return error_mark_node;
11441 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11442 Define the tag as a forward-reference if it is not defined.
11444 If a declaration is given, process it here, and report an error if
11445 multiple declarations are not identical.
11447 SCOPE is TS_CURRENT when this is also a definition. Only look in
11448 the current frame for the name (since C++ allows new names in any
11449 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11450 declaration. Only look beginning from the current scope outward up
11451 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11453 TEMPLATE_HEADER_P is true when this declaration is preceded by
11454 a set of template parameters. */
11457 xref_tag_1 (enum tag_types tag_code, tree name,
11458 tag_scope scope, bool template_header_p)
11460 enum tree_code code;
11462 tree context = NULL_TREE;
11464 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11470 code = RECORD_TYPE;
11476 code = ENUMERAL_TYPE;
11479 gcc_unreachable ();
11482 /* In case of anonymous name, xref_tag is only called to
11483 make type node and push name. Name lookup is not required. */
11484 if (ANON_AGGRNAME_P (name))
11487 t = lookup_and_check_tag (tag_code, name,
11488 scope, template_header_p);
11490 if (t == error_mark_node)
11491 return error_mark_node;
11493 if (scope != ts_current && t && current_class_type
11494 && template_class_depth (current_class_type)
11495 && template_header_p)
11497 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11498 definition of this tag. Since, in addition, we are currently
11499 processing a (member) template declaration of a template
11500 class, we must be very careful; consider:
11507 { template <class V>
11508 friend struct S1; };
11510 Here, the S2::S1 declaration should not be confused with the
11511 outer declaration. In particular, the inner version should
11512 have a template parameter of level 2, not level 1. This
11513 would be particularly important if the member declaration
11516 template <class V = U> friend struct S1;
11518 say, when we should tsubst into `U' when instantiating
11519 S2. On the other hand, when presented with:
11529 we must find the inner binding eventually. We
11530 accomplish this by making sure that the new type we
11531 create to represent this declaration has the right
11533 context = TYPE_CONTEXT (t);
11539 /* If no such tag is yet defined, create a forward-reference node
11540 and record it as the "definition".
11541 When a real declaration of this type is found,
11542 the forward-reference will be altered into a real type. */
11543 if (code == ENUMERAL_TYPE)
11545 error ("use of enum %q#D without previous declaration", name);
11546 return error_mark_node;
11550 t = make_class_type (code);
11551 TYPE_CONTEXT (t) = context;
11552 t = pushtag (name, t, scope);
11557 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11559 if (!redeclare_class_template (t, current_template_parms))
11560 return error_mark_node;
11562 else if (!processing_template_decl
11563 && CLASS_TYPE_P (t)
11564 && CLASSTYPE_IS_TEMPLATE (t))
11566 error ("redeclaration of %qT as a non-template", t);
11567 error ("previous declaration %q+D", t);
11568 return error_mark_node;
11571 /* Make injected friend class visible. */
11572 if (scope != ts_within_enclosing_non_class
11573 && hidden_name_p (TYPE_NAME (t)))
11575 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11576 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11578 if (TYPE_TEMPLATE_INFO (t))
11580 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11581 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11589 /* Wrapper for xref_tag_1. */
11592 xref_tag (enum tag_types tag_code, tree name,
11593 tag_scope scope, bool template_header_p)
11596 timevar_start (TV_NAME_LOOKUP);
11597 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11598 timevar_stop (TV_NAME_LOOKUP);
11604 xref_tag_from_type (tree old, tree id, tag_scope scope)
11606 enum tag_types tag_kind;
11608 if (TREE_CODE (old) == RECORD_TYPE)
11609 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11611 tag_kind = union_type;
11613 if (id == NULL_TREE)
11614 id = TYPE_IDENTIFIER (old);
11616 return xref_tag (tag_kind, id, scope, false);
11619 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11620 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11621 access_* node, and the TREE_VALUE is the type of the base-class.
11622 Non-NULL TREE_TYPE indicates virtual inheritance.
11624 Returns true if the binfo hierarchy was successfully created,
11625 false if an error was detected. */
11628 xref_basetypes (tree ref, tree base_list)
11631 tree binfo, base_binfo;
11632 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11633 unsigned max_bases = 0; /* Maximum direct bases. */
11635 tree default_access;
11636 tree igo_prev; /* Track Inheritance Graph Order. */
11638 if (ref == error_mark_node)
11641 /* The base of a derived class is private by default, all others are
11643 default_access = (TREE_CODE (ref) == RECORD_TYPE
11644 && CLASSTYPE_DECLARED_CLASS (ref)
11645 ? access_private_node : access_public_node);
11647 /* First, make sure that any templates in base-classes are
11648 instantiated. This ensures that if we call ourselves recursively
11649 we do not get confused about which classes are marked and which
11651 basep = &base_list;
11654 tree basetype = TREE_VALUE (*basep);
11656 if (!(processing_template_decl && uses_template_parms (basetype))
11657 && !complete_type_or_else (basetype, NULL))
11658 /* An incomplete type. Remove it from the list. */
11659 *basep = TREE_CHAIN (*basep);
11663 if (TREE_TYPE (*basep))
11665 if (CLASS_TYPE_P (basetype))
11666 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11667 basep = &TREE_CHAIN (*basep);
11671 TYPE_MARKED_P (ref) = 1;
11673 /* The binfo slot should be empty, unless this is an (ill-formed)
11675 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11677 error ("redefinition of %q#T", ref);
11681 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11683 binfo = make_tree_binfo (max_bases);
11685 TYPE_BINFO (ref) = binfo;
11686 BINFO_OFFSET (binfo) = size_zero_node;
11687 BINFO_TYPE (binfo) = ref;
11689 /* Apply base-class info set up to the variants of this type. */
11690 fixup_type_variants (ref);
11694 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11695 /* An aggregate cannot have baseclasses. */
11696 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11698 if (TREE_CODE (ref) == UNION_TYPE)
11700 error ("derived union %qT invalid", ref);
11707 if (TYPE_FOR_JAVA (ref))
11709 error ("Java class %qT cannot have multiple bases", ref);
11716 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11718 if (TYPE_FOR_JAVA (ref))
11720 error ("Java class %qT cannot have virtual bases", ref);
11725 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11727 tree access = TREE_PURPOSE (base_list);
11728 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11729 tree basetype = TREE_VALUE (base_list);
11731 if (access == access_default_node)
11732 access = default_access;
11734 if (PACK_EXPANSION_P (basetype))
11735 basetype = PACK_EXPANSION_PATTERN (basetype);
11736 if (TREE_CODE (basetype) == TYPE_DECL)
11737 basetype = TREE_TYPE (basetype);
11738 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11740 error ("base type %qT fails to be a struct or class type",
11745 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11746 TYPE_FOR_JAVA (ref) = 1;
11748 base_binfo = NULL_TREE;
11749 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11751 base_binfo = TYPE_BINFO (basetype);
11752 /* The original basetype could have been a typedef'd type. */
11753 basetype = BINFO_TYPE (base_binfo);
11755 /* Inherit flags from the base. */
11756 TYPE_HAS_NEW_OPERATOR (ref)
11757 |= TYPE_HAS_NEW_OPERATOR (basetype);
11758 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11759 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11760 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11761 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11762 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11763 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11764 CLASSTYPE_REPEATED_BASE_P (ref)
11765 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11768 /* We must do this test after we've seen through a typedef
11770 if (TYPE_MARKED_P (basetype))
11772 if (basetype == ref)
11773 error ("recursive type %qT undefined", basetype);
11775 error ("duplicate base type %qT invalid", basetype);
11779 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11780 /* Regenerate the pack expansion for the bases. */
11781 basetype = make_pack_expansion (basetype);
11783 TYPE_MARKED_P (basetype) = 1;
11785 base_binfo = copy_binfo (base_binfo, basetype, ref,
11786 &igo_prev, via_virtual);
11787 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11788 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11790 BINFO_BASE_APPEND (binfo, base_binfo);
11791 BINFO_BASE_ACCESS_APPEND (binfo, access);
11794 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11795 /* If we have space in the vbase vector, we must have shared at
11796 least one of them, and are therefore diamond shaped. */
11797 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11799 /* Unmark all the types. */
11800 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11801 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11802 TYPE_MARKED_P (ref) = 0;
11804 /* Now see if we have a repeated base type. */
11805 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11807 for (base_binfo = binfo; base_binfo;
11808 base_binfo = TREE_CHAIN (base_binfo))
11810 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11812 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11815 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11817 for (base_binfo = binfo; base_binfo;
11818 base_binfo = TREE_CHAIN (base_binfo))
11819 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11820 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11829 /* Copies the enum-related properties from type SRC to type DST.
11830 Used with the underlying type of an enum and the enum itself. */
11832 copy_type_enum (tree dst, tree src)
11834 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11835 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11836 TYPE_SIZE (dst) = TYPE_SIZE (src);
11837 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11838 SET_TYPE_MODE (dst, TYPE_MODE (src));
11839 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11840 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11841 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11842 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11845 /* Begin compiling the definition of an enumeration type.
11848 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11850 UNDERLYING_TYPE is the type that will be used as the storage for
11851 the enumeration type. This should be NULL_TREE if no storage type
11854 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11856 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11858 Returns the type object, as yet incomplete.
11859 Also records info about it so that build_enumerator
11860 may be used to declare the individual values as they are read. */
11863 start_enum (tree name, tree enumtype, tree underlying_type,
11864 bool scoped_enum_p, bool *is_new)
11866 tree prevtype = NULL_TREE;
11867 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11871 /* [C++0x dcl.enum]p5:
11873 If not explicitly specified, the underlying type of a scoped
11874 enumeration type is int. */
11875 if (!underlying_type && scoped_enum_p)
11876 underlying_type = integer_type_node;
11878 if (underlying_type)
11879 underlying_type = cv_unqualified (underlying_type);
11881 /* If this is the real definition for a previous forward reference,
11882 fill in the contents in the same object that used to be the
11883 forward reference. */
11885 enumtype = lookup_and_check_tag (enum_type, name,
11886 /*tag_scope=*/ts_current,
11887 /*template_header_p=*/false);
11889 /* In case of a template_decl, the only check that should be deferred
11890 to instantiation time is the comparison of underlying types. */
11891 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11893 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11895 error_at (input_location, "scoped/unscoped mismatch "
11896 "in enum %q#T", enumtype);
11897 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11898 "previous definition here");
11899 enumtype = error_mark_node;
11901 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11903 error_at (input_location, "underlying type mismatch "
11904 "in enum %q#T", enumtype);
11905 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11906 "previous definition here");
11907 enumtype = error_mark_node;
11909 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11910 && !dependent_type_p (underlying_type)
11911 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11912 && !same_type_p (underlying_type,
11913 ENUM_UNDERLYING_TYPE (enumtype)))
11915 error_at (input_location, "different underlying type "
11916 "in enum %q#T", enumtype);
11917 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11918 "previous definition here");
11919 underlying_type = NULL_TREE;
11923 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11924 || processing_template_decl)
11926 /* In case of error, make a dummy enum to allow parsing to
11928 if (enumtype == error_mark_node)
11930 name = make_anon_name ();
11931 enumtype = NULL_TREE;
11934 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11935 of an opaque enum, or an opaque enum of an already defined
11936 enumeration (C++0x only).
11937 In any other case, it'll be NULL_TREE. */
11943 prevtype = enumtype;
11944 enumtype = cxx_make_type (ENUMERAL_TYPE);
11945 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11946 if (enumtype == error_mark_node)
11947 return error_mark_node;
11949 /* The enum is considered opaque until the opening '{' of the
11950 enumerator list. */
11951 SET_OPAQUE_ENUM_P (enumtype, true);
11952 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11955 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11957 if (underlying_type)
11959 if (CP_INTEGRAL_TYPE_P (underlying_type))
11961 copy_type_enum (enumtype, underlying_type);
11962 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11964 else if (dependent_type_p (underlying_type))
11965 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11967 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11968 underlying_type, enumtype);
11971 /* If into a template class, the returned enum is always the first
11972 declaration (opaque or not) seen. This way all the references to
11973 this type will be to the same declaration. The following ones are used
11974 only to check for definition errors. */
11975 if (prevtype && processing_template_decl)
11981 /* After processing and defining all the values of an enumeration type,
11982 install their decls in the enumeration type.
11983 ENUMTYPE is the type object. */
11986 finish_enum_value_list (tree enumtype)
11989 tree underlying_type;
11992 tree minnode, maxnode;
11995 bool fixed_underlying_type_p
11996 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11998 /* We built up the VALUES in reverse order. */
11999 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12001 /* For an enum defined in a template, just set the type of the values;
12002 all further processing is postponed until the template is
12003 instantiated. We need to set the type so that tsubst of a CONST_DECL
12005 if (processing_template_decl)
12007 for (values = TYPE_VALUES (enumtype);
12009 values = TREE_CHAIN (values))
12010 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12014 /* Determine the minimum and maximum values of the enumerators. */
12015 if (TYPE_VALUES (enumtype))
12017 minnode = maxnode = NULL_TREE;
12019 for (values = TYPE_VALUES (enumtype);
12021 values = TREE_CHAIN (values))
12023 decl = TREE_VALUE (values);
12025 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12026 each enumerator has the type of its enumeration. Prior to the
12027 closing brace, the type of each enumerator is the type of its
12028 initializing value. */
12029 TREE_TYPE (decl) = enumtype;
12031 /* Update the minimum and maximum values, if appropriate. */
12032 value = DECL_INITIAL (decl);
12033 if (value == error_mark_node)
12034 value = integer_zero_node;
12035 /* Figure out what the minimum and maximum values of the
12036 enumerators are. */
12038 minnode = maxnode = value;
12039 else if (tree_int_cst_lt (maxnode, value))
12041 else if (tree_int_cst_lt (value, minnode))
12048 If the enumerator-list is empty, the underlying type is as if
12049 the enumeration had a single enumerator with value 0. */
12050 minnode = maxnode = integer_zero_node;
12052 if (!fixed_underlying_type_p)
12054 /* Compute the number of bits require to represent all values of the
12055 enumeration. We must do this before the type of MINNODE and
12056 MAXNODE are transformed, since tree_int_cst_min_precision relies
12057 on the TREE_TYPE of the value it is passed. */
12058 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12059 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12060 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12061 int precision = MAX (lowprec, highprec);
12063 bool use_short_enum;
12065 /* Determine the underlying type of the enumeration.
12069 The underlying type of an enumeration is an integral type that
12070 can represent all the enumerator values defined in the
12071 enumeration. It is implementation-defined which integral type is
12072 used as the underlying type for an enumeration except that the
12073 underlying type shall not be larger than int unless the value of
12074 an enumerator cannot fit in an int or unsigned int.
12076 We use "int" or an "unsigned int" as the underlying type, even if
12077 a smaller integral type would work, unless the user has
12078 explicitly requested that we use the smallest possible type. The
12079 user can request that for all enumerations with a command line
12080 flag, or for just one enumeration with an attribute. */
12082 use_short_enum = flag_short_enums
12083 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12085 for (itk = (use_short_enum ? itk_char : itk_int);
12089 underlying_type = integer_types[itk];
12090 if (underlying_type != NULL_TREE
12091 && TYPE_PRECISION (underlying_type) >= precision
12092 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12095 if (itk == itk_none)
12099 IF no integral type can represent all the enumerator values, the
12100 enumeration is ill-formed. */
12101 error ("no integral type can represent all of the enumerator values "
12102 "for %qT", enumtype);
12103 precision = TYPE_PRECISION (long_long_integer_type_node);
12104 underlying_type = integer_types[itk_unsigned_long_long];
12109 The value of sizeof() applied to an enumeration type, an object
12110 of an enumeration type, or an enumerator, is the value of sizeof()
12111 applied to the underlying type. */
12112 copy_type_enum (enumtype, underlying_type);
12114 /* Compute the minimum and maximum values for the type.
12118 For an enumeration where emin is the smallest enumerator and emax
12119 is the largest, the values of the enumeration are the values of the
12120 underlying type in the range bmin to bmax, where bmin and bmax are,
12121 respectively, the smallest and largest values of the smallest bit-
12122 field that can store emin and emax. */
12124 /* The middle-end currently assumes that types with TYPE_PRECISION
12125 narrower than their underlying type are suitably zero or sign
12126 extended to fill their mode. Similarly, it assumes that the front
12127 end assures that a value of a particular type must be within
12128 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12130 We used to set these fields based on bmin and bmax, but that led
12131 to invalid assumptions like optimizing away bounds checking. So
12132 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12133 TYPE_MAX_VALUE to the values for the mode above and only restrict
12134 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12135 ENUM_UNDERLYING_TYPE (enumtype)
12136 = build_distinct_type_copy (underlying_type);
12137 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12138 set_min_and_max_values_for_integral_type
12139 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12141 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12142 if (flag_strict_enums)
12143 set_min_and_max_values_for_integral_type (enumtype, precision,
12147 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12149 /* Convert each of the enumerators to the type of the underlying
12150 type of the enumeration. */
12151 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12153 location_t saved_location;
12155 decl = TREE_VALUE (values);
12156 saved_location = input_location;
12157 input_location = DECL_SOURCE_LOCATION (decl);
12158 if (fixed_underlying_type_p)
12159 /* If the enumeration type has a fixed underlying type, we
12160 already checked all of the enumerator values. */
12161 value = DECL_INITIAL (decl);
12163 value = perform_implicit_conversion (underlying_type,
12164 DECL_INITIAL (decl),
12165 tf_warning_or_error);
12166 input_location = saved_location;
12168 /* Do not clobber shared ints. */
12169 value = copy_node (value);
12171 TREE_TYPE (value) = enumtype;
12172 DECL_INITIAL (decl) = value;
12175 /* Fix up all variant types of this enum type. */
12176 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12177 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12179 /* Finish debugging output for this type. */
12180 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12183 /* Finishes the enum type. This is called only the first time an
12184 enumeration is seen, be it opaque or odinary.
12185 ENUMTYPE is the type object. */
12188 finish_enum (tree enumtype)
12190 if (processing_template_decl)
12192 if (at_function_scope_p ())
12193 add_stmt (build_min (TAG_DEFN, enumtype));
12197 /* Here there should not be any variants of this type. */
12198 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12199 && !TYPE_NEXT_VARIANT (enumtype));
12202 /* Build and install a CONST_DECL for an enumeration constant of the
12203 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12204 LOC is the location of NAME.
12205 Assignment of sequential values by default is handled here. */
12208 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12214 /* If the VALUE was erroneous, pretend it wasn't there; that will
12215 result in the enum being assigned the next value in sequence. */
12216 if (value == error_mark_node)
12219 /* Remove no-op casts from the value. */
12221 STRIP_TYPE_NOPS (value);
12223 if (! processing_template_decl)
12225 /* Validate and default VALUE. */
12226 if (value != NULL_TREE)
12228 value = cxx_constant_value (value);
12230 if (TREE_CODE (value) == INTEGER_CST
12231 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12233 value = perform_integral_promotions (value);
12237 error ("enumerator value for %qD is not an integer constant", name);
12242 /* Default based on previous value. */
12243 if (value == NULL_TREE)
12245 if (TYPE_VALUES (enumtype))
12248 unsigned HOST_WIDE_INT lo;
12252 /* C++03 7.2/4: If no initializer is specified for the first
12253 enumerator, the type is an unspecified integral
12254 type. Otherwise the type is the same as the type of the
12255 initializing value of the preceding enumerator unless the
12256 incremented value is not representable in that type, in
12257 which case the type is an unspecified integral type
12258 sufficient to contain the incremented value. */
12259 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12260 if (error_operand_p (prev_value))
12261 value = error_mark_node;
12264 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12265 TREE_INT_CST_HIGH (prev_value),
12270 tree type = TREE_TYPE (prev_value);
12271 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12272 di.low = lo; di.high = hi;
12273 if (!double_int_fits_to_tree_p (type, di))
12276 for (itk = itk_int; itk != itk_none; itk++)
12278 type = integer_types[itk];
12279 if (type != NULL_TREE
12280 && (pos || !TYPE_UNSIGNED (type))
12281 && double_int_fits_to_tree_p (type, di))
12284 if (type && cxx_dialect < cxx0x
12285 && itk > itk_unsigned_long)
12286 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12287 incremented enumerator value is too large for %<unsigned long%>" : "\
12288 incremented enumerator value is too large for %<long%>");
12290 if (type == NULL_TREE)
12293 value = double_int_to_tree (type, di);
12298 error ("overflow in enumeration values at %qD", name);
12299 value = error_mark_node;
12304 value = integer_zero_node;
12307 /* Remove no-op casts from the value. */
12308 STRIP_TYPE_NOPS (value);
12310 /* If the underlying type of the enum is fixed, check whether
12311 the enumerator values fits in the underlying type. If it
12312 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12313 if (ENUM_UNDERLYING_TYPE (enumtype)
12315 && TREE_CODE (value) == INTEGER_CST
12316 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12318 error ("enumerator value %E is too large for underlying type %<%T%>",
12319 value, ENUM_UNDERLYING_TYPE (enumtype));
12321 /* Silently convert the value so that we can continue. */
12322 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12327 /* C++ associates enums with global, function, or class declarations. */
12328 context = current_scope ();
12330 /* Build the actual enumeration constant. Note that the enumeration
12331 constants have the underlying type of the enum (if it is fixed)
12332 or the type of their initializer (if the underlying type of the
12333 enum is not fixed):
12337 If the underlying type is fixed, the type of each enumerator
12338 prior to the closing brace is the underlying type; if the
12339 initializing value of an enumerator cannot be represented by
12340 the underlying type, the program is ill-formed. If the
12341 underlying type is not fixed, the type of each enumerator is
12342 the type of its initializing value.
12344 If the underlying type is not fixed, it will be computed by
12345 finish_enum and we will reset the type of this enumerator. Of
12346 course, if we're processing a template, there may be no value. */
12347 type = value ? TREE_TYPE (value) : NULL_TREE;
12349 if (context && context == current_class_type)
12350 /* This enum declaration is local to the class. We need the full
12351 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12352 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12354 /* It's a global enum, or it's local to a function. (Note local to
12355 a function could mean local to a class method. */
12356 decl = build_decl (loc, CONST_DECL, name, type);
12358 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12359 TREE_CONSTANT (decl) = 1;
12360 TREE_READONLY (decl) = 1;
12361 DECL_INITIAL (decl) = value;
12363 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12364 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12365 on the TYPE_FIELDS list for `S'. (That's so that you can say
12366 things like `S::i' later.) */
12367 finish_member_declaration (decl);
12371 /* Add this enumeration constant to the list for this type. */
12372 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12375 /* Look for an enumerator with the given NAME within the enumeration
12376 type ENUMTYPE. This routine is used primarily for qualified name
12377 lookup into an enumerator in C++0x, e.g.,
12379 enum class Color { Red, Green, Blue };
12381 Color color = Color::Red;
12383 Returns the value corresponding to the enumerator, or
12384 NULL_TREE if no such enumerator was found. */
12386 lookup_enumerator (tree enumtype, tree name)
12389 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12391 e = purpose_member (name, TYPE_VALUES (enumtype));
12392 return e? TREE_VALUE (e) : NULL_TREE;
12396 /* We're defining DECL. Make sure that its type is OK. */
12399 check_function_type (tree decl, tree current_function_parms)
12401 tree fntype = TREE_TYPE (decl);
12402 tree return_type = complete_type (TREE_TYPE (fntype));
12404 /* In a function definition, arg types must be complete. */
12405 require_complete_types_for_parms (current_function_parms);
12407 if (dependent_type_p (return_type))
12409 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12410 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12412 tree args = TYPE_ARG_TYPES (fntype);
12414 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12415 error ("return type %q#T is incomplete", return_type);
12417 error ("return type has Java class type %q#T", return_type);
12419 /* Make it return void instead. */
12420 if (TREE_CODE (fntype) == METHOD_TYPE)
12421 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12423 TREE_CHAIN (args));
12425 fntype = build_function_type (void_type_node, args);
12427 = build_exception_variant (fntype,
12428 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12429 fntype = (cp_build_type_attribute_variant
12430 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12431 TREE_TYPE (decl) = fntype;
12434 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12437 /* Create the FUNCTION_DECL for a function definition.
12438 DECLSPECS and DECLARATOR are the parts of the declaration;
12439 they describe the function's name and the type it returns,
12440 but twisted together in a fashion that parallels the syntax of C.
12442 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12443 DECLARATOR is really the DECL for the function we are about to
12444 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12445 indicating that the function is an inline defined in-class.
12447 This function creates a binding context for the function body
12448 as well as setting up the FUNCTION_DECL in current_function_decl.
12450 For C++, we must first check whether that datum makes any sense.
12451 For example, "class A local_a(1,2);" means that variable local_a
12452 is an aggregate of type A, which should have a constructor
12453 applied to it with the argument list [1, 2].
12455 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12456 or may be a BLOCK if the function has been defined previously
12457 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12458 error_mark_node if the function has never been defined, or
12459 a BLOCK if the function has been defined somewhere. */
12462 start_preparsed_function (tree decl1, tree attrs, int flags)
12464 tree ctype = NULL_TREE;
12467 int doing_friend = 0;
12468 cp_binding_level *bl;
12469 tree current_function_parms;
12470 struct c_fileinfo *finfo
12471 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12472 bool honor_interface;
12474 /* Sanity check. */
12475 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12476 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12478 fntype = TREE_TYPE (decl1);
12479 if (TREE_CODE (fntype) == METHOD_TYPE)
12480 ctype = TYPE_METHOD_BASETYPE (fntype);
12482 /* ISO C++ 11.4/5. A friend function defined in a class is in
12483 the (lexical) scope of the class in which it is defined. */
12484 if (!ctype && DECL_FRIEND_P (decl1))
12486 ctype = DECL_FRIEND_CONTEXT (decl1);
12488 /* CTYPE could be null here if we're dealing with a template;
12489 for example, `inline friend float foo()' inside a template
12490 will have no CTYPE set. */
12491 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12497 if (DECL_DECLARED_INLINE_P (decl1)
12498 && lookup_attribute ("noinline", attrs))
12499 warning (0, "inline function %q+D given attribute noinline", decl1);
12501 /* Handle gnu_inline attribute. */
12502 if (GNU_INLINE_P (decl1))
12504 DECL_EXTERNAL (decl1) = 1;
12505 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12506 DECL_INTERFACE_KNOWN (decl1) = 1;
12507 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12510 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12511 /* This is a constructor, we must ensure that any default args
12512 introduced by this definition are propagated to the clones
12513 now. The clones are used directly in overload resolution. */
12514 adjust_clone_args (decl1);
12516 /* Sometimes we don't notice that a function is a static member, and
12517 build a METHOD_TYPE for it. Fix that up now. */
12518 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12519 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12521 /* Set up current_class_type, and enter the scope of the class, if
12524 push_nested_class (ctype);
12525 else if (DECL_STATIC_FUNCTION_P (decl1))
12526 push_nested_class (DECL_CONTEXT (decl1));
12528 /* Now that we have entered the scope of the class, we must restore
12529 the bindings for any template parameters surrounding DECL1, if it
12530 is an inline member template. (Order is important; consider the
12531 case where a template parameter has the same name as a field of
12532 the class.) It is not until after this point that
12533 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12534 if (flags & SF_INCLASS_INLINE)
12535 maybe_begin_member_template_processing (decl1);
12537 /* Effective C++ rule 15. */
12539 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12540 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12541 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12543 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12544 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12545 if (!DECL_INITIAL (decl1))
12546 DECL_INITIAL (decl1) = error_mark_node;
12548 /* This function exists in static storage.
12549 (This does not mean `static' in the C sense!) */
12550 TREE_STATIC (decl1) = 1;
12552 /* We must call push_template_decl after current_class_type is set
12553 up. (If we are processing inline definitions after exiting a
12554 class scope, current_class_type will be NULL_TREE until set above
12555 by push_nested_class.) */
12556 if (processing_template_decl)
12558 /* FIXME: Handle error_mark_node more gracefully. */
12559 tree newdecl1 = push_template_decl (decl1);
12560 if (newdecl1 != error_mark_node)
12564 /* We are now in the scope of the function being defined. */
12565 current_function_decl = decl1;
12567 /* Save the parm names or decls from this function's declarator
12568 where store_parm_decls will find them. */
12569 current_function_parms = DECL_ARGUMENTS (decl1);
12571 /* Make sure the parameter and return types are reasonable. When
12572 you declare a function, these types can be incomplete, but they
12573 must be complete when you define the function. */
12574 check_function_type (decl1, current_function_parms);
12576 /* Build the return declaration for the function. */
12577 restype = TREE_TYPE (fntype);
12578 if (DECL_RESULT (decl1) == NULL_TREE)
12582 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12583 DECL_ARTIFICIAL (resdecl) = 1;
12584 DECL_IGNORED_P (resdecl) = 1;
12585 DECL_RESULT (decl1) = resdecl;
12587 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12590 /* Let the user know we're compiling this function. */
12591 announce_function (decl1);
12593 /* Record the decl so that the function name is defined.
12594 If we already have a decl for this name, and it is a FUNCTION_DECL,
12595 use the old decl. */
12596 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12598 /* A specialization is not used to guide overload resolution. */
12599 if (!DECL_FUNCTION_MEMBER_P (decl1)
12600 && !(DECL_USE_TEMPLATE (decl1) &&
12601 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12603 tree olddecl = pushdecl (decl1);
12605 if (olddecl == error_mark_node)
12606 /* If something went wrong when registering the declaration,
12607 use DECL1; we have to have a FUNCTION_DECL to use when
12608 parsing the body of the function. */
12612 /* Otherwise, OLDDECL is either a previous declaration
12613 of the same function or DECL1 itself. */
12615 if (warn_missing_declarations
12616 && olddecl == decl1
12617 && !DECL_MAIN_P (decl1)
12618 && TREE_PUBLIC (decl1)
12619 && !DECL_DECLARED_INLINE_P (decl1))
12623 /* Check whether DECL1 is in an anonymous
12625 for (context = DECL_CONTEXT (decl1);
12627 context = DECL_CONTEXT (context))
12629 if (TREE_CODE (context) == NAMESPACE_DECL
12630 && DECL_NAME (context) == NULL_TREE)
12634 if (context == NULL)
12635 warning (OPT_Wmissing_declarations,
12636 "no previous declaration for %q+D", decl1);
12644 /* We need to set the DECL_CONTEXT. */
12645 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12646 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12648 fntype = TREE_TYPE (decl1);
12650 /* If #pragma weak applies, mark the decl appropriately now.
12651 The pragma only applies to global functions. Because
12652 determining whether or not the #pragma applies involves
12653 computing the mangled name for the declaration, we cannot
12654 apply the pragma until after we have merged this declaration
12655 with any previous declarations; if the original declaration
12656 has a linkage specification, that specification applies to
12657 the definition as well, and may affect the mangled name. */
12658 if (DECL_FILE_SCOPE_P (decl1))
12659 maybe_apply_pragma_weak (decl1);
12662 /* Reset this in case the call to pushdecl changed it. */
12663 current_function_decl = decl1;
12665 gcc_assert (DECL_INITIAL (decl1));
12667 /* This function may already have been parsed, in which case just
12668 return; our caller will skip over the body without parsing. */
12669 if (DECL_INITIAL (decl1) != error_mark_node)
12672 /* Initialize RTL machinery. We cannot do this until
12673 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12674 even when processing a template; this is how we get
12675 CFUN set up, and our per-function variables initialized.
12676 FIXME factor out the non-RTL stuff. */
12677 bl = current_binding_level;
12678 allocate_struct_function (decl1, processing_template_decl);
12680 /* Initialize the language data structures. Whenever we start
12681 a new function, we destroy temporaries in the usual way. */
12682 cfun->language = ggc_alloc_cleared_language_function ();
12683 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12684 current_binding_level = bl;
12686 /* Start the statement-tree, start the tree now. */
12687 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12689 /* If we are (erroneously) defining a function that we have already
12690 defined before, wipe out what we knew before. */
12691 if (!DECL_PENDING_INLINE_P (decl1))
12692 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12694 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12696 /* We know that this was set up by `grokclassfn'. We do not
12697 wait until `store_parm_decls', since evil parse errors may
12698 never get us to that point. Here we keep the consistency
12699 between `current_class_type' and `current_class_ptr'. */
12700 tree t = DECL_ARGUMENTS (decl1);
12702 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12703 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12705 cp_function_chain->x_current_class_ref
12706 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12707 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12708 cp_function_chain->x_current_class_ptr = t;
12710 /* Constructors and destructors need to know whether they're "in
12711 charge" of initializing virtual base classes. */
12712 t = DECL_CHAIN (t);
12713 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12715 current_in_charge_parm = t;
12716 t = DECL_CHAIN (t);
12718 if (DECL_HAS_VTT_PARM_P (decl1))
12720 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12721 current_vtt_parm = t;
12725 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12726 /* Implicitly-defined methods (like the
12727 destructor for a class in which no destructor
12728 is explicitly declared) must not be defined
12729 until their definition is needed. So, we
12730 ignore interface specifications for
12731 compiler-generated functions. */
12732 && !DECL_ARTIFICIAL (decl1));
12734 if (processing_template_decl)
12735 /* Don't mess with interface flags. */;
12736 else if (DECL_INTERFACE_KNOWN (decl1))
12738 tree ctx = decl_function_context (decl1);
12740 if (DECL_NOT_REALLY_EXTERN (decl1))
12741 DECL_EXTERNAL (decl1) = 0;
12743 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12744 && TREE_PUBLIC (ctx))
12745 /* This is a function in a local class in an extern inline
12747 comdat_linkage (decl1);
12749 /* If this function belongs to an interface, it is public.
12750 If it belongs to someone else's interface, it is also external.
12751 This only affects inlines and template instantiations. */
12752 else if (!finfo->interface_unknown && honor_interface)
12754 if (DECL_DECLARED_INLINE_P (decl1)
12755 || DECL_TEMPLATE_INSTANTIATION (decl1))
12757 DECL_EXTERNAL (decl1)
12758 = (finfo->interface_only
12759 || (DECL_DECLARED_INLINE_P (decl1)
12760 && ! flag_implement_inlines
12761 && !DECL_VINDEX (decl1)));
12763 /* For WIN32 we also want to put these in linkonce sections. */
12764 maybe_make_one_only (decl1);
12767 DECL_EXTERNAL (decl1) = 0;
12768 DECL_INTERFACE_KNOWN (decl1) = 1;
12769 /* If this function is in an interface implemented in this file,
12770 make sure that the back end knows to emit this function
12772 if (!DECL_EXTERNAL (decl1))
12773 mark_needed (decl1);
12775 else if (finfo->interface_unknown && finfo->interface_only
12776 && honor_interface)
12778 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12779 interface, we will have both finfo->interface_unknown and
12780 finfo->interface_only set. In that case, we don't want to
12781 use the normal heuristics because someone will supply a
12782 #pragma implementation elsewhere, and deducing it here would
12783 produce a conflict. */
12784 comdat_linkage (decl1);
12785 DECL_EXTERNAL (decl1) = 0;
12786 DECL_INTERFACE_KNOWN (decl1) = 1;
12787 DECL_DEFER_OUTPUT (decl1) = 1;
12791 /* This is a definition, not a reference.
12792 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12793 if (!GNU_INLINE_P (decl1))
12794 DECL_EXTERNAL (decl1) = 0;
12796 if ((DECL_DECLARED_INLINE_P (decl1)
12797 || DECL_TEMPLATE_INSTANTIATION (decl1))
12798 && ! DECL_INTERFACE_KNOWN (decl1))
12799 DECL_DEFER_OUTPUT (decl1) = 1;
12801 DECL_INTERFACE_KNOWN (decl1) = 1;
12804 /* Determine the ELF visibility attribute for the function. We must not
12805 do this before calling "pushdecl", as we must allow "duplicate_decls"
12806 to merge any attributes appropriately. We also need to wait until
12808 if (!DECL_CLONED_FUNCTION_P (decl1))
12809 determine_visibility (decl1);
12811 begin_scope (sk_function_parms, decl1);
12815 if (DECL_DESTRUCTOR_P (decl1)
12816 || (DECL_CONSTRUCTOR_P (decl1)
12817 && targetm.cxx.cdtor_returns_this ()))
12819 cdtor_label = build_decl (input_location,
12820 LABEL_DECL, NULL_TREE, NULL_TREE);
12821 DECL_CONTEXT (cdtor_label) = current_function_decl;
12824 start_fname_decls ();
12826 store_parm_decls (current_function_parms);
12830 /* Like start_preparsed_function, except that instead of a
12831 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12833 Returns 1 on success. If the DECLARATOR is not suitable for a function
12834 (it defines a datum instead), we return 0, which tells
12835 yyparse to report a parse error. */
12838 start_function (cp_decl_specifier_seq *declspecs,
12839 const cp_declarator *declarator,
12844 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12845 if (decl1 == error_mark_node)
12847 /* If the declarator is not suitable for a function definition,
12848 cause a syntax error. */
12849 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12851 error ("invalid function declaration");
12855 if (DECL_MAIN_P (decl1))
12856 /* main must return int. grokfndecl should have corrected it
12857 (and issued a diagnostic) if the user got it wrong. */
12858 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12859 integer_type_node));
12861 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12866 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12870 use_eh_spec_block (tree fn)
12872 return (flag_exceptions && flag_enforce_eh_specs
12873 && !processing_template_decl
12874 && !type_throw_all_p (TREE_TYPE (fn))
12875 /* We insert the EH_SPEC_BLOCK only in the original
12876 function; then, it is copied automatically to the
12878 && !DECL_CLONED_FUNCTION_P (fn)
12879 /* Implicitly-generated constructors and destructors have
12880 exception specifications. However, those specifications
12881 are the union of the possible exceptions specified by the
12882 constructors/destructors for bases and members, so no
12883 unallowed exception will ever reach this function. By
12884 not creating the EH_SPEC_BLOCK we save a little memory,
12885 and we avoid spurious warnings about unreachable
12887 && !DECL_DEFAULTED_FN (fn));
12890 /* Store the parameter declarations into the current function declaration.
12891 This is called after parsing the parameter declarations, before
12892 digesting the body of the function.
12894 Also install to binding contour return value identifier, if any. */
12897 store_parm_decls (tree current_function_parms)
12899 tree fndecl = current_function_decl;
12902 /* This is a chain of any other decls that came in among the parm
12903 declarations. If a parm is declared with enum {foo, bar} x;
12904 then CONST_DECLs for foo and bar are put here. */
12905 tree nonparms = NULL_TREE;
12907 if (current_function_parms)
12909 /* This case is when the function was defined with an ANSI prototype.
12910 The parms already have decls, so we need not do anything here
12911 except record them as in effect
12912 and complain if any redundant old-style parm decls were written. */
12914 tree specparms = current_function_parms;
12917 /* Must clear this because it might contain TYPE_DECLs declared
12919 current_binding_level->names = NULL;
12921 /* If we're doing semantic analysis, then we'll call pushdecl
12922 for each of these. We must do them in reverse order so that
12923 they end in the correct forward order. */
12924 specparms = nreverse (specparms);
12926 for (parm = specparms; parm; parm = next)
12928 next = DECL_CHAIN (parm);
12929 if (TREE_CODE (parm) == PARM_DECL)
12931 if (DECL_NAME (parm) == NULL_TREE
12932 || TREE_CODE (parm) != VOID_TYPE)
12935 error ("parameter %qD declared void", parm);
12939 /* If we find an enum constant or a type tag,
12940 put it aside for the moment. */
12941 TREE_CHAIN (parm) = NULL_TREE;
12942 nonparms = chainon (nonparms, parm);
12946 /* Get the decls in their original chain order and record in the
12947 function. This is all and only the PARM_DECLs that were
12948 pushed into scope by the loop above. */
12949 DECL_ARGUMENTS (fndecl) = getdecls ();
12952 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12954 /* Now store the final chain of decls for the arguments
12955 as the decl-chain of the current lexical scope.
12956 Put the enumerators in as well, at the front so that
12957 DECL_ARGUMENTS is not modified. */
12958 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12960 if (use_eh_spec_block (current_function_decl))
12961 current_eh_spec_block = begin_eh_spec_block ();
12965 /* We have finished doing semantic analysis on DECL, but have not yet
12966 generated RTL for its body. Save away our current state, so that
12967 when we want to generate RTL later we know what to do. */
12970 save_function_data (tree decl)
12972 struct language_function *f;
12974 /* Save the language-specific per-function data so that we can
12975 get it back when we really expand this function. */
12976 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12979 f = ggc_alloc_language_function ();
12980 memcpy (f, cp_function_chain, sizeof (struct language_function));
12981 DECL_SAVED_FUNCTION_DATA (decl) = f;
12983 /* Clear out the bits we don't need. */
12984 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
12985 f->bindings = NULL;
12986 f->x_local_names = NULL;
12990 /* Set the return value of the constructor (if present). */
12993 finish_constructor_body (void)
12998 if (targetm.cxx.cdtor_returns_this ()
12999 && (! TYPE_FOR_JAVA (current_class_type)))
13001 /* Any return from a constructor will end up here. */
13002 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13004 val = DECL_ARGUMENTS (current_function_decl);
13005 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13006 DECL_RESULT (current_function_decl), val);
13007 /* Return the address of the object. */
13008 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13009 add_stmt (exprstmt);
13013 /* Do all the processing for the beginning of a destructor; set up the
13014 vtable pointers and cleanups for bases and members. */
13017 begin_destructor_body (void)
13019 tree compound_stmt;
13021 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13022 issued an error message. We still want to try to process the
13023 body of the function, but initialize_vtbl_ptrs will crash if
13024 TYPE_BINFO is NULL. */
13025 if (COMPLETE_TYPE_P (current_class_type))
13027 compound_stmt = begin_compound_stmt (0);
13028 /* Make all virtual function table pointers in non-virtual base
13029 classes point to CURRENT_CLASS_TYPE's virtual function
13031 initialize_vtbl_ptrs (current_class_ptr);
13032 finish_compound_stmt (compound_stmt);
13034 /* And insert cleanups for our bases and members so that they
13035 will be properly destroyed if we throw. */
13036 push_base_cleanups ();
13040 /* At the end of every destructor we generate code to delete the object if
13041 necessary. Do that now. */
13044 finish_destructor_body (void)
13048 /* Any return from a destructor will end up here; that way all base
13049 and member cleanups will be run when the function returns. */
13050 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13052 /* In a virtual destructor, we must call delete. */
13053 if (DECL_VIRTUAL_P (current_function_decl))
13056 tree virtual_size = cxx_sizeof (current_class_type);
13060 At the point of definition of a virtual destructor (including
13061 an implicit definition), non-placement operator delete shall
13062 be looked up in the scope of the destructor's class and if
13063 found shall be accessible and unambiguous. */
13064 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13066 /*global_p=*/false,
13067 /*placement=*/NULL_TREE,
13068 /*alloc_fn=*/NULL_TREE);
13070 if_stmt = begin_if_stmt ();
13071 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13072 current_in_charge_parm,
13075 finish_expr_stmt (exprstmt);
13076 finish_then_clause (if_stmt);
13077 finish_if_stmt (if_stmt);
13080 if (targetm.cxx.cdtor_returns_this ())
13084 val = DECL_ARGUMENTS (current_function_decl);
13085 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13086 DECL_RESULT (current_function_decl), val);
13087 /* Return the address of the object. */
13088 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13089 add_stmt (exprstmt);
13093 /* Do the necessary processing for the beginning of a function body, which
13094 in this case includes member-initializers, but not the catch clauses of
13095 a function-try-block. Currently, this means opening a binding level
13096 for the member-initializers (in a ctor), member cleanups (in a dtor),
13097 and capture proxies (in a lambda operator()). */
13100 begin_function_body (void)
13104 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13107 if (processing_template_decl)
13108 /* Do nothing now. */;
13110 /* Always keep the BLOCK node associated with the outermost pair of
13111 curly braces of a function. These are needed for correct
13112 operation of dwarfout.c. */
13113 keep_next_level (true);
13115 stmt = begin_compound_stmt (BCS_FN_BODY);
13117 if (processing_template_decl)
13118 /* Do nothing now. */;
13119 else if (DECL_DESTRUCTOR_P (current_function_decl))
13120 begin_destructor_body ();
13125 /* Do the processing for the end of a function body. Currently, this means
13126 closing out the cleanups for fully-constructed bases and members, and in
13127 the case of the destructor, deleting the object if desired. Again, this
13128 is only meaningful for [cd]tors, since they are the only functions where
13129 there is a significant distinction between the main body and any
13130 function catch clauses. Handling, say, main() return semantics here
13131 would be wrong, as flowing off the end of a function catch clause for
13132 main() would also need to return 0. */
13135 finish_function_body (tree compstmt)
13137 if (compstmt == NULL_TREE)
13140 /* Close the block. */
13141 finish_compound_stmt (compstmt);
13143 if (processing_template_decl)
13144 /* Do nothing now. */;
13145 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13146 finish_constructor_body ();
13147 else if (DECL_DESTRUCTOR_P (current_function_decl))
13148 finish_destructor_body ();
13151 /* Given a function, returns the BLOCK corresponding to the outermost level
13152 of curly braces, skipping the artificial block created for constructor
13156 outer_curly_brace_block (tree fndecl)
13158 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13159 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13160 /* Skip the artificial function body block. */
13161 block = BLOCK_SUBBLOCKS (block);
13165 /* If FNDECL is a class's key method, add the class to the list of
13166 keyed classes that should be emitted. */
13169 record_key_method_defined (tree fndecl)
13171 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13172 && DECL_VIRTUAL_P (fndecl)
13173 && !processing_template_decl)
13175 tree fnclass = DECL_CONTEXT (fndecl);
13176 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13177 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13181 /* Subroutine of finish_function.
13182 Save the body of constexpr functions for possible
13183 future compile time evaluation. */
13186 maybe_save_function_definition (tree fun)
13188 if (!processing_template_decl
13189 && DECL_DECLARED_CONSTEXPR_P (fun)
13190 && !DECL_CLONED_FUNCTION_P (fun))
13191 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13194 /* Finish up a function declaration and compile that function
13195 all the way to assembler language output. The free the storage
13196 for the function definition.
13198 FLAGS is a bitwise or of the following values:
13200 We just finished processing the body of an in-class inline
13201 function definition. (This processing will have taken place
13202 after the class definition is complete.) */
13205 finish_function (int flags)
13207 tree fndecl = current_function_decl;
13208 tree fntype, ctype = NULL_TREE;
13209 int inclass_inline = (flags & 2) != 0;
13211 /* When we get some parse errors, we can end up without a
13212 current_function_decl, so cope. */
13213 if (fndecl == NULL_TREE)
13214 return error_mark_node;
13216 if (c_dialect_objc ())
13217 objc_finish_function ();
13219 gcc_assert (!defer_mark_used_calls);
13220 defer_mark_used_calls = true;
13222 record_key_method_defined (fndecl);
13224 fntype = TREE_TYPE (fndecl);
13226 /* TREE_READONLY (fndecl) = 1;
13227 This caused &foo to be of type ptr-to-const-function
13228 which then got a warning when stored in a ptr-to-function variable. */
13230 gcc_assert (building_stmt_list_p ());
13231 /* The current function is being defined, so its DECL_INITIAL should
13232 be set, and unless there's a multiple definition, it should be
13233 error_mark_node. */
13234 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13236 /* For a cloned function, we've already got all the code we need;
13237 there's no need to add any extra bits. */
13238 if (!DECL_CLONED_FUNCTION_P (fndecl))
13240 if (DECL_MAIN_P (current_function_decl))
13242 /* Make it so that `main' always returns 0 by default (or
13245 finish_return_stmt (integer_one_node);
13247 finish_return_stmt (integer_zero_node);
13251 if (use_eh_spec_block (current_function_decl))
13252 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13253 (TREE_TYPE (current_function_decl)),
13254 current_eh_spec_block);
13257 /* If we're saving up tree structure, tie off the function now. */
13258 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13260 finish_fname_decls ();
13262 /* If this function can't throw any exceptions, remember that. */
13263 if (!processing_template_decl
13264 && !cp_function_chain->can_throw
13265 && !flag_non_call_exceptions
13266 && !decl_replaceable_p (fndecl))
13267 TREE_NOTHROW (fndecl) = 1;
13269 /* This must come after expand_function_end because cleanups might
13270 have declarations (from inline functions) that need to go into
13271 this function's blocks. */
13273 /* If the current binding level isn't the outermost binding level
13274 for this function, either there is a bug, or we have experienced
13275 syntax errors and the statement tree is malformed. */
13276 if (current_binding_level->kind != sk_function_parms)
13278 /* Make sure we have already experienced errors. */
13279 gcc_assert (errorcount);
13281 /* Throw away the broken statement tree and extra binding
13283 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13285 while (current_binding_level->kind != sk_function_parms)
13287 if (current_binding_level->kind == sk_class)
13288 pop_nested_class ();
13290 poplevel (0, 0, 0);
13293 poplevel (1, 0, 1);
13295 /* Statements should always be full-expressions at the outermost set
13296 of curly braces for a function. */
13297 gcc_assert (stmts_are_full_exprs_p ());
13299 /* Save constexpr function body before it gets munged by
13300 the NRV transformation. */
13301 maybe_save_function_definition (fndecl);
13303 /* Set up the named return value optimization, if we can. Candidate
13304 variables are selected in check_return_expr. */
13305 if (current_function_return_value)
13307 tree r = current_function_return_value;
13310 if (r != error_mark_node
13311 /* This is only worth doing for fns that return in memory--and
13312 simpler, since we don't have to worry about promoted modes. */
13313 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13314 /* Only allow this for variables declared in the outer scope of
13315 the function so we know that their lifetime always ends with a
13316 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13317 we were to do this optimization in tree-ssa. */
13318 && (outer = outer_curly_brace_block (fndecl))
13319 && chain_member (r, BLOCK_VARS (outer)))
13320 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13322 current_function_return_value = NULL_TREE;
13325 /* Remember that we were in class scope. */
13326 if (current_class_name)
13327 ctype = current_class_type;
13329 /* Must mark the RESULT_DECL as being in this function. */
13330 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13332 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13333 to the FUNCTION_DECL node itself. */
13334 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13336 /* Save away current state, if appropriate. */
13337 if (!processing_template_decl)
13338 save_function_data (fndecl);
13340 /* Complain if there's just no return statement. */
13341 if (warn_return_type
13342 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13343 && !dependent_type_p (TREE_TYPE (fntype))
13344 && !current_function_returns_value && !current_function_returns_null
13345 /* Don't complain if we abort or throw. */
13346 && !current_function_returns_abnormally
13347 /* Don't complain if we are declared noreturn. */
13348 && !TREE_THIS_VOLATILE (fndecl)
13349 && !DECL_NAME (DECL_RESULT (fndecl))
13350 && !TREE_NO_WARNING (fndecl)
13351 /* Structor return values (if any) are set by the compiler. */
13352 && !DECL_CONSTRUCTOR_P (fndecl)
13353 && !DECL_DESTRUCTOR_P (fndecl))
13355 warning (OPT_Wreturn_type,
13356 "no return statement in function returning non-void");
13357 TREE_NO_WARNING (fndecl) = 1;
13360 /* Store the end of the function, so that we get good line number
13361 info for the epilogue. */
13362 cfun->function_end_locus = input_location;
13364 /* Complain about parameters that are only set, but never otherwise used. */
13365 if (warn_unused_but_set_parameter
13366 && !processing_template_decl
13367 && errorcount == unused_but_set_errorcount
13368 && !DECL_CLONED_FUNCTION_P (fndecl))
13372 for (decl = DECL_ARGUMENTS (fndecl);
13374 decl = DECL_CHAIN (decl))
13375 if (TREE_USED (decl)
13376 && TREE_CODE (decl) == PARM_DECL
13377 && !DECL_READ_P (decl)
13378 && DECL_NAME (decl)
13379 && !DECL_ARTIFICIAL (decl)
13380 && !TREE_NO_WARNING (decl)
13381 && !DECL_IN_SYSTEM_HEADER (decl)
13382 && TREE_TYPE (decl) != error_mark_node
13383 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13384 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13385 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13386 warning (OPT_Wunused_but_set_parameter,
13387 "parameter %q+D set but not used", decl);
13388 unused_but_set_errorcount = errorcount;
13391 /* Genericize before inlining. */
13392 if (!processing_template_decl)
13394 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13395 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13396 cp_genericize (fndecl);
13397 /* Clear out the bits we don't need. */
13398 f->x_current_class_ptr = NULL;
13399 f->x_current_class_ref = NULL;
13400 f->x_eh_spec_block = NULL;
13401 f->x_in_charge_parm = NULL;
13402 f->x_vtt_parm = NULL;
13403 f->x_return_value = NULL;
13404 f->bindings = NULL;
13405 f->extern_decl_map = NULL;
13407 /* Clear out the bits we don't need. */
13408 local_names = NULL;
13410 /* We're leaving the context of this function, so zap cfun. It's still in
13411 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13413 current_function_decl = NULL;
13415 /* If this is an in-class inline definition, we may have to pop the
13416 bindings for the template parameters that we added in
13417 maybe_begin_member_template_processing when start_function was
13419 if (inclass_inline)
13420 maybe_end_member_template_processing ();
13422 /* Leave the scope of the class. */
13424 pop_nested_class ();
13429 current_function_decl = NULL_TREE;
13431 defer_mark_used_calls = false;
13432 if (deferred_mark_used_calls)
13437 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13439 VEC_free (tree, gc, deferred_mark_used_calls);
13445 /* Create the FUNCTION_DECL for a function definition.
13446 DECLSPECS and DECLARATOR are the parts of the declaration;
13447 they describe the return type and the name of the function,
13448 but twisted together in a fashion that parallels the syntax of C.
13450 This function creates a binding context for the function body
13451 as well as setting up the FUNCTION_DECL in current_function_decl.
13453 Returns a FUNCTION_DECL on success.
13455 If the DECLARATOR is not suitable for a function (it defines a datum
13456 instead), we return 0, which tells yyparse to report a parse error.
13458 May return void_type_node indicating that this method is actually
13459 a friend. See grokfield for more details.
13461 Came here with a `.pushlevel' .
13463 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13464 CHANGES TO CODE IN `grokfield'. */
13467 grokmethod (cp_decl_specifier_seq *declspecs,
13468 const cp_declarator *declarator, tree attrlist)
13470 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13473 if (fndecl == error_mark_node)
13474 return error_mark_node;
13476 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13478 error ("invalid member function declaration");
13479 return error_mark_node;
13483 cplus_decl_attributes (&fndecl, attrlist, 0);
13485 /* Pass friends other than inline friend functions back. */
13486 if (fndecl == void_type_node)
13489 if (DECL_IN_AGGR_P (fndecl))
13491 if (DECL_CLASS_SCOPE_P (fndecl))
13492 error ("%qD is already defined in class %qT", fndecl,
13493 DECL_CONTEXT (fndecl));
13494 return error_mark_node;
13497 check_template_shadow (fndecl);
13499 DECL_DECLARED_INLINE_P (fndecl) = 1;
13500 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13502 /* We process method specializations in finish_struct_1. */
13503 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13505 fndecl = push_template_decl (fndecl);
13506 if (fndecl == error_mark_node)
13510 if (! DECL_FRIEND_P (fndecl))
13512 if (DECL_CHAIN (fndecl))
13514 fndecl = copy_node (fndecl);
13515 TREE_CHAIN (fndecl) = NULL_TREE;
13519 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13521 DECL_IN_AGGR_P (fndecl) = 1;
13526 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13527 we can lay it out later, when and if its type becomes complete. */
13530 maybe_register_incomplete_var (tree var)
13532 gcc_assert (TREE_CODE (var) == VAR_DECL);
13534 /* Keep track of variables with incomplete types. */
13535 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13536 && DECL_EXTERNAL (var))
13538 tree inner_type = TREE_TYPE (var);
13540 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13541 inner_type = TREE_TYPE (inner_type);
13542 inner_type = TYPE_MAIN_VARIANT (inner_type);
13544 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13545 /* RTTI TD entries are created while defining the type_info. */
13546 || (TYPE_LANG_SPECIFIC (inner_type)
13547 && TYPE_BEING_DEFINED (inner_type)))
13550 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13552 iv->incomplete_type = inner_type;
13557 /* Called when a class type (given by TYPE) is defined. If there are
13558 any existing VAR_DECLs whose type has been completed by this
13559 declaration, update them now. */
13562 complete_vars (tree type)
13565 incomplete_var *iv;
13567 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13569 if (same_type_p (type, iv->incomplete_type))
13571 tree var = iv->decl;
13572 tree type = TREE_TYPE (var);
13573 /* Complete the type of the variable. The VAR_DECL itself
13574 will be laid out in expand_expr. */
13575 complete_type (type);
13576 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13577 /* Remove this entry from the list. */
13578 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13584 /* Check for pending declarations which may have abstract type. */
13585 complete_type_check_abstract (type);
13588 /* If DECL is of a type which needs a cleanup, build and return an
13589 expression to perform that cleanup here. Return NULL_TREE if no
13590 cleanup need be done. */
13593 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13599 /* Assume no cleanup is required. */
13600 cleanup = NULL_TREE;
13602 if (error_operand_p (decl))
13605 /* Handle "__attribute__((cleanup))". We run the cleanup function
13606 before the destructor since the destructor is what actually
13607 terminates the lifetime of the object. */
13608 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13615 /* Get the name specified by the user for the cleanup function. */
13616 id = TREE_VALUE (TREE_VALUE (attr));
13617 /* Look up the name to find the cleanup function to call. It is
13618 important to use lookup_name here because that is what is
13619 used in c-common.c:handle_cleanup_attribute when performing
13620 initial checks on the attribute. Note that those checks
13621 include ensuring that the function found is not an overloaded
13622 function, or an object with an overloaded call operator,
13623 etc.; we can rely on the fact that the function found is an
13624 ordinary FUNCTION_DECL. */
13625 fn = lookup_name (id);
13626 arg = build_address (decl);
13628 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13629 if (cleanup == error_mark_node)
13630 return error_mark_node;
13632 /* Handle ordinary C++ destructors. */
13633 type = TREE_TYPE (decl);
13634 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13636 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13637 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13638 && CLASSTYPE_VBASECLASSES (type));
13642 if (TREE_CODE (type) == ARRAY_TYPE)
13645 addr = build_address (decl);
13647 /* Optimize for space over speed here. */
13648 if (!has_vbases || flag_expensive_optimizations)
13649 flags |= LOOKUP_NONVIRTUAL;
13651 call = build_delete (TREE_TYPE (addr), addr,
13652 sfk_complete_destructor, flags, 0, complain);
13653 if (call == error_mark_node)
13654 cleanup = error_mark_node;
13656 cleanup = cp_build_compound_expr (cleanup, call, complain);
13664 /* When a stmt has been parsed, this function is called. */
13671 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13672 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13673 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13676 static_fn_type (tree memfntype)
13681 if (TYPE_PTRMEMFUNC_P (memfntype))
13682 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13683 if (POINTER_TYPE_P (memfntype)
13684 || TREE_CODE (memfntype) == FUNCTION_DECL)
13685 memfntype = TREE_TYPE (memfntype);
13686 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13688 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13689 args = TYPE_ARG_TYPES (memfntype);
13690 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13691 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13692 fntype = (cp_build_type_attribute_variant
13693 (fntype, TYPE_ATTRIBUTES (memfntype)));
13694 fntype = (build_exception_variant
13695 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13699 /* DECL was originally constructed as a non-static member function,
13700 but turned out to be static. Update it accordingly. */
13703 revert_static_member_fn (tree decl)
13705 tree stype = static_fn_type (decl);
13706 cp_cv_quals quals = type_memfn_quals (stype);
13708 if (quals != TYPE_UNQUALIFIED)
13709 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13711 TREE_TYPE (decl) = stype;
13713 if (DECL_ARGUMENTS (decl))
13714 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13715 DECL_STATIC_FUNCTION_P (decl) = 1;
13718 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13719 one of the language-independent trees. */
13721 enum cp_tree_node_structure_enum
13722 cp_tree_node_structure (union lang_tree_node * t)
13724 switch (TREE_CODE (&t->generic))
13726 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13727 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13728 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13729 case OVERLOAD: return TS_CP_OVERLOAD;
13730 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13731 case PTRMEM_CST: return TS_CP_PTRMEM;
13732 case BASELINK: return TS_CP_BASELINK;
13733 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13734 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13735 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13736 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13737 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13738 default: return TS_CP_GENERIC;
13742 /* Build the void_list_node (void_type_node having been created). */
13744 build_void_list_node (void)
13746 tree t = build_tree_list (NULL_TREE, void_type_node);
13751 cp_missing_noreturn_ok_p (tree decl)
13753 /* A missing noreturn is ok for the `main' function. */
13754 return DECL_MAIN_P (decl);
13757 /* Return the COMDAT group into which DECL should be placed. */
13760 cxx_comdat_group (tree decl)
13764 /* Virtual tables, construction virtual tables, and virtual table
13765 tables all go in a single COMDAT group, named after the primary
13767 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13768 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13769 /* For all other DECLs, the COMDAT group is the mangled name of the
13770 declaration itself. */
13773 while (DECL_THUNK_P (decl))
13775 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13776 into the same section as the target function. In that case
13777 we must return target's name. */
13778 tree target = THUNK_TARGET (decl);
13779 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13780 && DECL_SECTION_NAME (target) != NULL
13781 && DECL_ONE_ONLY (target))
13786 name = DECL_ASSEMBLER_NAME (decl);
13792 #include "gt-cp-decl.h"