1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, tree *, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, tree *);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (DECL_P (olddecl)
1207 && TREE_CODE (newdecl) == FUNCTION_DECL
1208 && TREE_CODE (olddecl) == FUNCTION_DECL
1209 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1211 if (DECL_DECLARED_INLINE_P (newdecl)
1212 && DECL_UNINLINABLE (newdecl)
1213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1214 /* Already warned elsewhere. */;
1215 else if (DECL_DECLARED_INLINE_P (olddecl)
1216 && DECL_UNINLINABLE (olddecl)
1217 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 /* Already warned. */;
1219 else if (DECL_DECLARED_INLINE_P (newdecl)
1220 && DECL_UNINLINABLE (olddecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1225 warning (OPT_Wattributes, "previous declaration of %q+D "
1226 "with attribute noinline", olddecl);
1228 else if (DECL_DECLARED_INLINE_P (olddecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1232 warning (OPT_Wattributes, "function %q+D redeclared with "
1233 "attribute noinline", newdecl);
1234 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1239 /* Check for redeclaration and other discrepancies. */
1240 if (TREE_CODE (olddecl) == FUNCTION_DECL
1241 && DECL_ARTIFICIAL (olddecl))
1243 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1244 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1246 /* Avoid warnings redeclaring built-ins which have not been
1247 explicitly declared. */
1248 if (DECL_ANTICIPATED (olddecl))
1251 /* If you declare a built-in or predefined function name as static,
1252 the old definition is overridden, but optionally warn this was a
1253 bad choice of name. */
1254 if (! TREE_PUBLIC (newdecl))
1256 warning (OPT_Wshadow,
1257 DECL_BUILT_IN (olddecl)
1258 ? G_("shadowing built-in function %q#D")
1259 : G_("shadowing library function %q#D"), olddecl);
1260 /* Discard the old built-in function. */
1263 /* If the built-in is not ansi, then programs can override
1264 it even globally without an error. */
1265 else if (! DECL_BUILT_IN (olddecl))
1266 warning (0, "library function %q#D redeclared as non-function %q#D",
1270 error ("declaration of %q#D", newdecl);
1271 error ("conflicts with built-in declaration %q#D",
1276 else if (!types_match)
1278 /* Avoid warnings redeclaring built-ins which have not been
1279 explicitly declared. */
1280 if (DECL_ANTICIPATED (olddecl))
1282 /* Deal with fileptr_type_node. FILE type is not known
1283 at the time we create the builtins. */
1286 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1287 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1289 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1292 else if (TREE_VALUE (t2) == fileptr_type_node)
1294 tree t = TREE_VALUE (t1);
1296 if (TREE_CODE (t) == POINTER_TYPE
1297 && TYPE_NAME (TREE_TYPE (t))
1298 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1299 == get_identifier ("FILE")
1300 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1302 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1305 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1306 types_match = decls_match (newdecl, olddecl);
1308 return duplicate_decls (newdecl, olddecl,
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1313 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1316 else if ((DECL_EXTERN_C_P (newdecl)
1317 && DECL_EXTERN_C_P (olddecl))
1318 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1321 /* A near match; override the builtin. */
1323 if (TREE_PUBLIC (newdecl))
1325 warning (0, "new declaration %q#D", newdecl);
1326 warning (0, "ambiguates built-in declaration %q#D",
1330 warning (OPT_Wshadow,
1331 DECL_BUILT_IN (olddecl)
1332 ? G_("shadowing built-in function %q#D")
1333 : G_("shadowing library function %q#D"), olddecl);
1336 /* Discard the old built-in function. */
1339 /* Replace the old RTL to avoid problems with inlining. */
1340 COPY_DECL_RTL (newdecl, olddecl);
1342 /* Even if the types match, prefer the new declarations type for
1343 built-ins which have not been explicitly declared, for
1344 exception lists, etc... */
1345 else if (DECL_IS_BUILTIN (olddecl))
1347 tree type = TREE_TYPE (newdecl);
1348 tree attribs = (*targetm.merge_type_attributes)
1349 (TREE_TYPE (olddecl), type);
1351 type = cp_build_type_attribute_variant (type, attribs);
1352 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1355 /* If a function is explicitly declared "throw ()", propagate that to
1356 the corresponding builtin. */
1357 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1358 && DECL_ANTICIPATED (olddecl)
1359 && TREE_NOTHROW (newdecl)
1360 && !TREE_NOTHROW (olddecl)
1361 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1362 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1364 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1366 /* Whether or not the builtin can throw exceptions has no
1367 bearing on this declarator. */
1368 TREE_NOTHROW (olddecl) = 0;
1370 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1372 /* If a builtin function is redeclared as `static', merge
1373 the declarations, but make the original one static. */
1374 DECL_THIS_STATIC (olddecl) = 1;
1375 TREE_PUBLIC (olddecl) = 0;
1377 /* Make the old declaration consistent with the new one so
1378 that all remnants of the builtin-ness of this function
1379 will be banished. */
1380 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1381 COPY_DECL_RTL (newdecl, olddecl);
1384 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1386 /* C++ Standard, 3.3, clause 4:
1387 "[Note: a namespace name or a class template name must be unique
1388 in its declarative region (7.3.2, clause 14). ]" */
1389 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1390 && TREE_CODE (newdecl) != NAMESPACE_DECL
1391 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1392 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1393 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1394 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1396 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1397 && TREE_CODE (newdecl) != TYPE_DECL)
1398 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1399 && TREE_CODE (olddecl) != TYPE_DECL))
1401 /* We do nothing special here, because C++ does such nasty
1402 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1403 get shadowed, and know that if we need to find a TYPE_DECL
1404 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1405 slot of the identifier. */
1409 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1410 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1411 || (TREE_CODE (olddecl) == FUNCTION_DECL
1412 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1416 error ("%q#D redeclared as different kind of symbol", newdecl);
1417 if (TREE_CODE (olddecl) == TREE_LIST)
1418 olddecl = TREE_VALUE (olddecl);
1419 error ("previous declaration of %q+#D", olddecl);
1421 return error_mark_node;
1423 else if (!types_match)
1425 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1426 /* These are certainly not duplicate declarations; they're
1427 from different scopes. */
1430 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1432 /* The name of a class template may not be declared to refer to
1433 any other template, class, function, object, namespace, value,
1434 or type in the same scope. */
1435 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1436 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1438 error ("declaration of template %q#D", newdecl);
1439 error ("conflicts with previous declaration %q+#D", olddecl);
1441 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1442 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1443 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1444 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1445 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1446 DECL_TEMPLATE_PARMS (olddecl))
1447 /* Template functions can be disambiguated by
1449 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1450 TREE_TYPE (TREE_TYPE (olddecl))))
1452 error ("new declaration %q#D", newdecl);
1453 error ("ambiguates old declaration %q+#D", olddecl);
1457 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1459 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1461 error ("declaration of C function %q#D conflicts with",
1463 error ("previous declaration %q+#D here", olddecl);
1466 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1467 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1471 return error_mark_node;
1478 error ("conflicting declaration %q#D", newdecl);
1479 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1480 return error_mark_node;
1483 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1484 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1485 && (!DECL_TEMPLATE_INFO (newdecl)
1486 || (DECL_TI_TEMPLATE (newdecl)
1487 != DECL_TI_TEMPLATE (olddecl))))
1488 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1489 && (!DECL_TEMPLATE_INFO (olddecl)
1490 || (DECL_TI_TEMPLATE (olddecl)
1491 != DECL_TI_TEMPLATE (newdecl))))))
1492 /* It's OK to have a template specialization and a non-template
1493 with the same type, or to have specializations of two
1494 different templates with the same type. Note that if one is a
1495 specialization, and the other is an instantiation of the same
1496 template, that we do not exit at this point. That situation
1497 can occur if we instantiate a template class, and then
1498 specialize one of its methods. This situation is valid, but
1499 the declarations must be merged in the usual way. */
1501 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1502 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1503 && !DECL_USE_TEMPLATE (newdecl))
1504 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1505 && !DECL_USE_TEMPLATE (olddecl))))
1506 /* One of the declarations is a template instantiation, and the
1507 other is not a template at all. That's OK. */
1509 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1511 /* In [namespace.alias] we have:
1513 In a declarative region, a namespace-alias-definition can be
1514 used to redefine a namespace-alias declared in that declarative
1515 region to refer only to the namespace to which it already
1518 Therefore, if we encounter a second alias directive for the same
1519 alias, we can just ignore the second directive. */
1520 if (DECL_NAMESPACE_ALIAS (newdecl)
1521 && (DECL_NAMESPACE_ALIAS (newdecl)
1522 == DECL_NAMESPACE_ALIAS (olddecl)))
1524 /* [namespace.alias]
1526 A namespace-name or namespace-alias shall not be declared as
1527 the name of any other entity in the same declarative region.
1528 A namespace-name defined at global scope shall not be
1529 declared as the name of any other entity in any global scope
1531 error ("declaration of namespace %qD conflicts with", newdecl);
1532 error ("previous declaration of namespace %q+D here", olddecl);
1533 return error_mark_node;
1537 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1540 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1541 if (DECL_NAME (olddecl) != NULL_TREE)
1542 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1543 ? "%q+#D previously defined here"
1544 : "%q+#D previously declared here", olddecl);
1545 return error_mark_node;
1547 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1548 && DECL_INITIAL (olddecl) != NULL_TREE
1549 && !prototype_p (TREE_TYPE (olddecl))
1550 && prototype_p (TREE_TYPE (newdecl)))
1552 /* Prototype decl follows defn w/o prototype. */
1553 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1554 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1555 "follows non-prototype definition here");
1557 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1558 || TREE_CODE (olddecl) == VAR_DECL)
1559 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1562 If two declarations of the same function or object
1563 specify different linkage-specifications ..., the program
1564 is ill-formed.... Except for functions with C++ linkage,
1565 a function declaration without a linkage specification
1566 shall not precede the first linkage specification for
1567 that function. A function can be declared without a
1568 linkage specification after an explicit linkage
1569 specification has been seen; the linkage explicitly
1570 specified in the earlier declaration is not affected by
1571 such a function declaration.
1573 DR 563 raises the question why the restrictions on
1574 functions should not also apply to objects. Older
1575 versions of G++ silently ignore the linkage-specification
1583 which is clearly wrong. Therefore, we now treat objects
1585 if (current_lang_depth () == 0)
1587 /* There is no explicit linkage-specification, so we use
1588 the linkage from the previous declaration. */
1589 if (!DECL_LANG_SPECIFIC (newdecl))
1590 retrofit_lang_decl (newdecl);
1591 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1595 error ("previous declaration of %q+#D with %qL linkage",
1596 olddecl, DECL_LANGUAGE (olddecl));
1597 error ("conflicts with new declaration with %qL linkage",
1598 DECL_LANGUAGE (newdecl));
1602 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1604 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1606 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1607 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1610 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1611 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1613 for (; t1 && t1 != void_list_node;
1614 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1615 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1617 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1620 permerror (input_location, "default argument given for parameter %d of %q#D",
1622 permerror (input_location, "after previous specification in %q+#D", olddecl);
1626 error ("default argument given for parameter %d of %q#D",
1628 error ("after previous specification in %q+#D",
1635 /* Do not merge an implicit typedef with an explicit one. In:
1639 typedef class A A __attribute__ ((foo));
1641 the attribute should apply only to the typedef. */
1642 if (TREE_CODE (olddecl) == TYPE_DECL
1643 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1644 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1647 /* If new decl is `static' and an `extern' was seen previously,
1649 warn_extern_redeclared_static (newdecl, olddecl);
1651 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1652 return error_mark_node;
1654 /* We have committed to returning 1 at this point. */
1655 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1657 /* Now that functions must hold information normally held
1658 by field decls, there is extra work to do so that
1659 declaration information does not get destroyed during
1661 if (DECL_VINDEX (olddecl))
1662 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1663 if (DECL_CONTEXT (olddecl))
1664 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1665 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1666 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1667 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1668 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1669 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1670 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1671 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1672 SET_OVERLOADED_OPERATOR_CODE
1673 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1674 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1676 /* Optionally warn about more than one declaration for the same
1677 name, but don't warn about a function declaration followed by a
1679 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1680 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1681 /* Don't warn about extern decl followed by definition. */
1682 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1683 /* Don't warn about friends, let add_friend take care of it. */
1684 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1686 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1687 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1690 if (DECL_DELETED_FN (newdecl))
1692 error ("deleted definition of %qD", newdecl);
1693 error ("after previous declaration %q+D", olddecl);
1695 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1698 /* Deal with C++: must preserve virtual function table size. */
1699 if (TREE_CODE (olddecl) == TYPE_DECL)
1701 tree newtype = TREE_TYPE (newdecl);
1702 tree oldtype = TREE_TYPE (olddecl);
1704 if (newtype != error_mark_node && oldtype != error_mark_node
1705 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1706 CLASSTYPE_FRIEND_CLASSES (newtype)
1707 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1709 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1712 /* Copy all the DECL_... slots specified in the new decl
1713 except for any that we copy here from the old type. */
1714 DECL_ATTRIBUTES (newdecl)
1715 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1717 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1721 old_result = DECL_TEMPLATE_RESULT (olddecl);
1722 new_result = DECL_TEMPLATE_RESULT (newdecl);
1723 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1724 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1725 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1726 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1728 DECL_ATTRIBUTES (old_result)
1729 = (*targetm.merge_decl_attributes) (old_result, new_result);
1731 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1733 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1734 && DECL_INITIAL (new_result))
1736 if (DECL_INITIAL (old_result))
1737 DECL_UNINLINABLE (old_result) = 1;
1739 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1740 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1741 DECL_NOT_REALLY_EXTERN (old_result)
1742 = DECL_NOT_REALLY_EXTERN (new_result);
1743 DECL_INTERFACE_KNOWN (old_result)
1744 = DECL_INTERFACE_KNOWN (new_result);
1745 DECL_DECLARED_INLINE_P (old_result)
1746 = DECL_DECLARED_INLINE_P (new_result);
1747 DECL_DISREGARD_INLINE_LIMITS (old_result)
1748 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1753 DECL_DECLARED_INLINE_P (old_result)
1754 |= DECL_DECLARED_INLINE_P (new_result);
1755 DECL_DISREGARD_INLINE_LIMITS (old_result)
1756 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1757 check_redeclaration_exception_specification (newdecl, olddecl);
1761 /* If the new declaration is a definition, update the file and
1762 line information on the declaration, and also make
1763 the old declaration the same definition. */
1764 if (DECL_INITIAL (new_result) != NULL_TREE)
1766 DECL_SOURCE_LOCATION (olddecl)
1767 = DECL_SOURCE_LOCATION (old_result)
1768 = DECL_SOURCE_LOCATION (newdecl);
1769 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1770 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1773 DECL_ARGUMENTS (old_result)
1774 = DECL_ARGUMENTS (new_result);
1775 for (parm = DECL_ARGUMENTS (old_result); parm;
1776 parm = DECL_CHAIN (parm))
1777 DECL_CONTEXT (parm) = old_result;
1786 /* Automatically handles default parameters. */
1787 tree oldtype = TREE_TYPE (olddecl);
1790 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1791 maybe_instantiate_noexcept (olddecl);
1793 /* Merge the data types specified in the two decls. */
1794 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1796 /* If merge_types produces a non-typedef type, just use the old type. */
1797 if (TREE_CODE (newdecl) == TYPE_DECL
1798 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1801 if (TREE_CODE (newdecl) == VAR_DECL)
1803 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1804 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1805 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1806 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1807 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1808 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1810 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1811 if (DECL_LANG_SPECIFIC (olddecl)
1812 && CP_DECL_THREADPRIVATE_P (olddecl))
1814 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1815 if (!DECL_LANG_SPECIFIC (newdecl))
1816 retrofit_lang_decl (newdecl);
1818 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1819 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1823 /* Do this after calling `merge_types' so that default
1824 parameters don't confuse us. */
1825 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1826 check_redeclaration_exception_specification (newdecl, olddecl);
1827 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1829 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1830 check_default_args (newdecl);
1832 /* Lay the type out, unless already done. */
1833 if (! same_type_p (newtype, oldtype)
1834 && TREE_TYPE (newdecl) != error_mark_node
1835 && !(processing_template_decl && uses_template_parms (newdecl)))
1836 layout_type (TREE_TYPE (newdecl));
1838 if ((TREE_CODE (newdecl) == VAR_DECL
1839 || TREE_CODE (newdecl) == PARM_DECL
1840 || TREE_CODE (newdecl) == RESULT_DECL
1841 || TREE_CODE (newdecl) == FIELD_DECL
1842 || TREE_CODE (newdecl) == TYPE_DECL)
1843 && !(processing_template_decl && uses_template_parms (newdecl)))
1844 layout_decl (newdecl, 0);
1846 /* Merge the type qualifiers. */
1847 if (TREE_READONLY (newdecl))
1848 TREE_READONLY (olddecl) = 1;
1849 if (TREE_THIS_VOLATILE (newdecl))
1850 TREE_THIS_VOLATILE (olddecl) = 1;
1851 if (TREE_NOTHROW (newdecl))
1852 TREE_NOTHROW (olddecl) = 1;
1854 /* Merge deprecatedness. */
1855 if (TREE_DEPRECATED (newdecl))
1856 TREE_DEPRECATED (olddecl) = 1;
1858 /* Preserve function specific target and optimization options */
1859 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1861 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1862 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1863 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1864 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1866 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1867 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1868 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1869 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1872 /* Merge the initialization information. */
1873 if (DECL_INITIAL (newdecl) == NULL_TREE
1874 && DECL_INITIAL (olddecl) != NULL_TREE)
1876 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1877 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1881 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1885 /* Merge the section attribute.
1886 We want to issue an error if the sections conflict but that must be
1887 done later in decl_attributes since we are called before attributes
1889 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1890 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1892 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1894 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1895 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1896 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1897 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1898 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1899 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1900 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1901 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1902 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1903 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1904 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1905 /* Keep the old RTL. */
1906 COPY_DECL_RTL (olddecl, newdecl);
1908 else if (TREE_CODE (newdecl) == VAR_DECL
1909 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1911 /* Keep the old RTL. We cannot keep the old RTL if the old
1912 declaration was for an incomplete object and the new
1913 declaration is not since many attributes of the RTL will
1915 COPY_DECL_RTL (olddecl, newdecl);
1918 /* If cannot merge, then use the new type and qualifiers,
1919 and don't preserve the old rtl. */
1922 /* Clean out any memory we had of the old declaration. */
1923 tree oldstatic = value_member (olddecl, static_aggregates);
1925 TREE_VALUE (oldstatic) = error_mark_node;
1927 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1928 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1929 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1930 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1933 /* Merge the storage class information. */
1934 merge_weak (newdecl, olddecl);
1936 if (DECL_ONE_ONLY (olddecl))
1937 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1939 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1940 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1941 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1942 if (! DECL_EXTERNAL (olddecl))
1943 DECL_EXTERNAL (newdecl) = 0;
1945 new_template_info = NULL_TREE;
1946 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1948 bool new_redefines_gnu_inline = false;
1950 if (new_defines_function
1951 && ((DECL_INTERFACE_KNOWN (olddecl)
1952 && TREE_CODE (olddecl) == FUNCTION_DECL)
1953 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1954 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1955 == FUNCTION_DECL))))
1959 if (TREE_CODE (fn) == TEMPLATE_DECL)
1960 fn = DECL_TEMPLATE_RESULT (olddecl);
1962 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1965 if (!new_redefines_gnu_inline)
1967 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1968 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1969 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1971 DECL_TEMPLATE_INSTANTIATED (newdecl)
1972 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1973 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1975 /* If the OLDDECL is an instantiation and/or specialization,
1976 then the NEWDECL must be too. But, it may not yet be marked
1977 as such if the caller has created NEWDECL, but has not yet
1978 figured out that it is a redeclaration. */
1979 if (!DECL_USE_TEMPLATE (newdecl))
1980 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1982 /* Don't really know how much of the language-specific
1983 values we should copy from old to new. */
1984 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1985 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1986 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1987 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1989 if (LANG_DECL_HAS_MIN (newdecl))
1991 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1992 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1993 if (DECL_TEMPLATE_INFO (newdecl))
1994 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1995 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1997 /* Only functions have these fields. */
1998 if (TREE_CODE (newdecl) == FUNCTION_DECL
1999 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2001 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2002 olddecl_friend = DECL_FRIEND_P (olddecl);
2003 hidden_friend = (DECL_ANTICIPATED (olddecl)
2004 && DECL_HIDDEN_FRIEND_P (olddecl)
2005 && newdecl_is_friend);
2006 DECL_BEFRIENDING_CLASSES (newdecl)
2007 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2008 DECL_BEFRIENDING_CLASSES (olddecl));
2009 /* DECL_THUNKS is only valid for virtual functions,
2010 otherwise it is a DECL_FRIEND_CONTEXT. */
2011 if (DECL_VIRTUAL_P (newdecl))
2012 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2014 /* Only variables have this field. */
2015 else if (TREE_CODE (newdecl) == VAR_DECL
2016 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2017 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2020 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2024 /* Merge parameter attributes. */
2025 tree oldarg, newarg;
2026 for (oldarg = DECL_ARGUMENTS(olddecl),
2027 newarg = DECL_ARGUMENTS(newdecl);
2029 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2030 DECL_ATTRIBUTES (newarg)
2031 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2032 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2035 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2036 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2038 /* If newdecl is not a specialization, then it is not a
2039 template-related function at all. And that means that we
2040 should have exited above, returning 0. */
2041 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2043 if (DECL_ODR_USED (olddecl))
2044 /* From [temp.expl.spec]:
2046 If a template, a member template or the member of a class
2047 template is explicitly specialized then that
2048 specialization shall be declared before the first use of
2049 that specialization that would cause an implicit
2050 instantiation to take place, in every translation unit in
2051 which such a use occurs. */
2052 error ("explicit specialization of %qD after first use",
2055 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2057 /* Don't propagate visibility from the template to the
2058 specialization here. We'll do that in determine_visibility if
2060 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2062 /* [temp.expl.spec/14] We don't inline explicit specialization
2063 just because the primary template says so. */
2065 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2066 the always_inline attribute. */
2067 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2068 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2070 if (DECL_DECLARED_INLINE_P (newdecl))
2071 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2073 DECL_ATTRIBUTES (newdecl)
2074 = remove_attribute ("always_inline",
2075 DECL_ATTRIBUTES (newdecl));
2078 else if (new_defines_function && DECL_INITIAL (olddecl))
2080 /* Never inline re-defined extern inline functions.
2081 FIXME: this could be better handled by keeping both
2082 function as separate declarations. */
2083 DECL_UNINLINABLE (newdecl) = 1;
2087 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2088 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2090 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2092 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2093 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2095 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2096 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2097 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2098 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2101 /* Preserve abstractness on cloned [cd]tors. */
2102 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2104 /* Update newdecl's parms to point at olddecl. */
2105 for (parm = DECL_ARGUMENTS (newdecl); parm;
2106 parm = DECL_CHAIN (parm))
2107 DECL_CONTEXT (parm) = olddecl;
2111 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2112 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2113 COPY_DECL_RTL (newdecl, olddecl);
2115 if (! types_match || new_defines_function)
2117 /* These need to be copied so that the names are available.
2118 Note that if the types do match, we'll preserve inline
2119 info and other bits, but if not, we won't. */
2120 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2121 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2123 if (new_defines_function)
2124 /* If defining a function declared with other language
2125 linkage, use the previously declared language linkage. */
2126 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2127 else if (types_match)
2129 /* If redeclaring a builtin function, and not a definition,
2130 it stays built in. */
2131 if (DECL_BUILT_IN (olddecl))
2133 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2134 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2135 /* If we're keeping the built-in definition, keep the rtl,
2136 regardless of declaration matches. */
2137 COPY_DECL_RTL (olddecl, newdecl);
2140 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2141 /* Don't clear out the arguments if we're just redeclaring a
2143 if (DECL_ARGUMENTS (olddecl))
2144 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2147 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2148 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2150 /* Now preserve various other info from the definition. */
2151 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2152 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2153 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2154 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2156 /* Warn about conflicting visibility specifications. */
2157 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2158 && DECL_VISIBILITY_SPECIFIED (newdecl)
2159 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2161 warning_at (input_location, OPT_Wattributes,
2162 "%q+D: visibility attribute ignored because it", newdecl);
2163 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2164 "conflicts with previous declaration here");
2166 /* Choose the declaration which specified visibility. */
2167 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2169 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2170 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2172 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2173 so keep this behavior. */
2174 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2176 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2177 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2179 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2180 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2181 if (TREE_CODE (newdecl) == FIELD_DECL)
2182 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2184 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2185 with that from NEWDECL below. */
2186 if (DECL_LANG_SPECIFIC (olddecl))
2188 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2189 != DECL_LANG_SPECIFIC (newdecl));
2190 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2193 /* Merge the USED information. */
2194 if (TREE_USED (olddecl))
2195 TREE_USED (newdecl) = 1;
2196 else if (TREE_USED (newdecl))
2197 TREE_USED (olddecl) = 1;
2198 if (TREE_CODE (newdecl) == VAR_DECL)
2200 if (DECL_READ_P (olddecl))
2201 DECL_READ_P (newdecl) = 1;
2202 else if (DECL_READ_P (newdecl))
2203 DECL_READ_P (olddecl) = 1;
2205 if (DECL_PRESERVE_P (olddecl))
2206 DECL_PRESERVE_P (newdecl) = 1;
2207 else if (DECL_PRESERVE_P (newdecl))
2208 DECL_PRESERVE_P (olddecl) = 1;
2210 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2214 function_size = sizeof (struct tree_decl_common);
2216 memcpy ((char *) olddecl + sizeof (struct tree_common),
2217 (char *) newdecl + sizeof (struct tree_common),
2218 function_size - sizeof (struct tree_common));
2220 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2221 (char *) newdecl + sizeof (struct tree_decl_common),
2222 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2223 if (new_template_info)
2224 /* If newdecl is a template instantiation, it is possible that
2225 the following sequence of events has occurred:
2227 o A friend function was declared in a class template. The
2228 class template was instantiated.
2230 o The instantiation of the friend declaration was
2231 recorded on the instantiation list, and is newdecl.
2233 o Later, however, instantiate_class_template called pushdecl
2234 on the newdecl to perform name injection. But, pushdecl in
2235 turn called duplicate_decls when it discovered that another
2236 declaration of a global function with the same name already
2239 o Here, in duplicate_decls, we decided to clobber newdecl.
2241 If we're going to do that, we'd better make sure that
2242 olddecl, and not newdecl, is on the list of
2243 instantiations so that if we try to do the instantiation
2244 again we won't get the clobbered declaration. */
2245 reregister_specialization (newdecl,
2251 size_t size = tree_code_size (TREE_CODE (olddecl));
2252 memcpy ((char *) olddecl + sizeof (struct tree_common),
2253 (char *) newdecl + sizeof (struct tree_common),
2254 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2255 switch (TREE_CODE (olddecl))
2265 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2266 (char *) newdecl + sizeof (struct tree_decl_common),
2267 size - sizeof (struct tree_decl_common)
2268 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2272 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2273 (char *) newdecl + sizeof (struct tree_decl_common),
2274 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2275 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2279 DECL_UID (olddecl) = olddecl_uid;
2281 DECL_FRIEND_P (olddecl) = 1;
2284 DECL_ANTICIPATED (olddecl) = 1;
2285 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2288 /* NEWDECL contains the merged attribute lists.
2289 Update OLDDECL to be the same. */
2290 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2292 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2293 so that encode_section_info has a chance to look at the new decl
2294 flags and attributes. */
2295 if (DECL_RTL_SET_P (olddecl)
2296 && (TREE_CODE (olddecl) == FUNCTION_DECL
2297 || (TREE_CODE (olddecl) == VAR_DECL
2298 && TREE_STATIC (olddecl))))
2299 make_decl_rtl (olddecl);
2301 /* The NEWDECL will no longer be needed. Because every out-of-class
2302 declaration of a member results in a call to duplicate_decls,
2303 freeing these nodes represents in a significant savings. */
2309 /* Return zero if the declaration NEWDECL is valid
2310 when the declaration OLDDECL (assumed to be for the same name)
2311 has already been seen.
2312 Otherwise return an error message format string with a %s
2313 where the identifier should go. */
2316 redeclaration_error_message (tree newdecl, tree olddecl)
2318 if (TREE_CODE (newdecl) == TYPE_DECL)
2320 /* Because C++ can put things into name space for free,
2321 constructs like "typedef struct foo { ... } foo"
2322 would look like an erroneous redeclaration. */
2323 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2326 return G_("redefinition of %q#D");
2328 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2330 /* If this is a pure function, its olddecl will actually be
2331 the original initialization to `0' (which we force to call
2332 abort()). Don't complain about redefinition in this case. */
2333 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2334 && DECL_INITIAL (olddecl) == NULL_TREE)
2337 /* If both functions come from different namespaces, this is not
2338 a redeclaration - this is a conflict with a used function. */
2339 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2340 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2341 && ! decls_match (olddecl, newdecl))
2342 return G_("%qD conflicts with used function");
2344 /* We'll complain about linkage mismatches in
2345 warn_extern_redeclared_static. */
2347 /* Defining the same name twice is no good. */
2348 if (DECL_INITIAL (olddecl) != NULL_TREE
2349 && DECL_INITIAL (newdecl) != NULL_TREE)
2351 if (DECL_NAME (olddecl) == NULL_TREE)
2352 return G_("%q#D not declared in class");
2353 else if (!GNU_INLINE_P (olddecl)
2354 || GNU_INLINE_P (newdecl))
2355 return G_("redefinition of %q#D");
2358 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2360 bool olda = GNU_INLINE_P (olddecl);
2361 bool newa = GNU_INLINE_P (newdecl);
2366 return G_("%q+D redeclared inline with "
2367 "%<gnu_inline%> attribute");
2369 return G_("%q+D redeclared inline without "
2370 "%<gnu_inline%> attribute");
2376 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2380 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2382 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2383 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2384 return G_("redefinition of %q#D");
2388 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2389 || (DECL_TEMPLATE_RESULT (newdecl)
2390 == DECL_TEMPLATE_RESULT (olddecl)))
2393 nt = DECL_TEMPLATE_RESULT (newdecl);
2394 if (DECL_TEMPLATE_INFO (nt))
2395 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2396 ot = DECL_TEMPLATE_RESULT (olddecl);
2397 if (DECL_TEMPLATE_INFO (ot))
2398 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2399 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2400 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2401 return G_("redefinition of %q#D");
2403 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2405 bool olda = GNU_INLINE_P (ot);
2406 bool newa = GNU_INLINE_P (nt);
2411 return G_("%q+D redeclared inline with "
2412 "%<gnu_inline%> attribute");
2414 return G_("%q+D redeclared inline without "
2415 "%<gnu_inline%> attribute");
2419 /* Core issue #226 (C++0x):
2421 If a friend function template declaration specifies a
2422 default template-argument, that declaration shall be a
2423 definition and shall be the only declaration of the
2424 function template in the translation unit. */
2425 if ((cxx_dialect != cxx98)
2426 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2427 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2428 /*is_primary=*/1, /*is_partial=*/0,
2429 /*is_friend_decl=*/2))
2430 return G_("redeclaration of friend %q#D "
2431 "may not have default template arguments");
2435 else if (TREE_CODE (newdecl) == VAR_DECL
2436 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2437 && (! DECL_LANG_SPECIFIC (olddecl)
2438 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2439 || DECL_THREAD_LOCAL_P (newdecl)))
2441 /* Only variables can be thread-local, and all declarations must
2442 agree on this property. */
2443 if (DECL_THREAD_LOCAL_P (newdecl))
2444 return G_("thread-local declaration of %q#D follows "
2445 "non-thread-local declaration");
2447 return G_("non-thread-local declaration of %q#D follows "
2448 "thread-local declaration");
2450 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2452 /* The objects have been declared at namespace scope. If either
2453 is a member of an anonymous union, then this is an invalid
2454 redeclaration. For example:
2460 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2461 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2462 return G_("redeclaration of %q#D");
2463 /* If at least one declaration is a reference, there is no
2464 conflict. For example:
2470 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2472 /* Reject two definitions. */
2473 return G_("redefinition of %q#D");
2477 /* Objects declared with block scope: */
2478 /* Reject two definitions, and reject a definition
2479 together with an external reference. */
2480 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2481 return G_("redeclaration of %q#D");
2486 /* Hash and equality functions for the named_label table. */
2489 named_label_entry_hash (const void *data)
2491 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2492 return DECL_UID (ent->label_decl);
2496 named_label_entry_eq (const void *a, const void *b)
2498 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2499 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2500 return ent_a->label_decl == ent_b->label_decl;
2503 /* Create a new label, named ID. */
2506 make_label_decl (tree id, int local_p)
2508 struct named_label_entry *ent;
2512 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2514 DECL_CONTEXT (decl) = current_function_decl;
2515 DECL_MODE (decl) = VOIDmode;
2516 C_DECLARED_LABEL_FLAG (decl) = local_p;
2518 /* Say where one reference is to the label, for the sake of the
2519 error if it is not defined. */
2520 DECL_SOURCE_LOCATION (decl) = input_location;
2522 /* Record the fact that this identifier is bound to this label. */
2523 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2525 /* Create the label htab for the function on demand. */
2527 named_labels = htab_create_ggc (13, named_label_entry_hash,
2528 named_label_entry_eq, NULL);
2530 /* Record this label on the list of labels used in this function.
2531 We do this before calling make_label_decl so that we get the
2532 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2533 ent = ggc_alloc_cleared_named_label_entry ();
2534 ent->label_decl = decl;
2536 slot = htab_find_slot (named_labels, ent, INSERT);
2537 gcc_assert (*slot == NULL);
2543 /* Look for a label named ID in the current function. If one cannot
2544 be found, create one. (We keep track of used, but undefined,
2545 labels, and complain about them at the end of a function.) */
2548 lookup_label_1 (tree id)
2552 /* You can't use labels at global scope. */
2553 if (current_function_decl == NULL_TREE)
2555 error ("label %qE referenced outside of any function", id);
2559 /* See if we've already got this label. */
2560 decl = IDENTIFIER_LABEL_VALUE (id);
2561 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2564 decl = make_label_decl (id, /*local_p=*/0);
2568 /* Wrapper for lookup_label_1. */
2571 lookup_label (tree id)
2574 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2575 ret = lookup_label_1 (id);
2576 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2580 /* Declare a local label named ID. */
2583 declare_local_label (tree id)
2586 cp_label_binding *bind;
2588 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2589 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2590 bind = VEC_safe_push (cp_label_binding, gc,
2591 current_binding_level->shadowed_labels, NULL);
2592 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2594 decl = make_label_decl (id, /*local_p=*/1);
2600 /* Returns nonzero if it is ill-formed to jump past the declaration of
2601 DECL. Returns 2 if it's also a real problem. */
2604 decl_jump_unsafe (tree decl)
2606 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2607 with automatic storage duration is not in scope to a point where it is
2608 in scope is ill-formed unless the variable has scalar type, class type
2609 with a trivial default constructor and a trivial destructor, a
2610 cv-qualified version of one of these types, or an array of one of the
2611 preceding types and is declared without an initializer (8.5). */
2612 tree type = TREE_TYPE (decl);
2614 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2615 || type == error_mark_node)
2618 type = strip_array_types (type);
2620 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2621 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2624 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2630 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2633 identify_goto (tree decl, const location_t *locus)
2636 permerror (input_location, "jump to label %qD", decl);
2638 permerror (input_location, "jump to case label");
2640 permerror (*locus, " from here");
2643 /* Check that a single previously seen jump to a newly defined label
2644 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2645 the jump context; NAMES are the names in scope in LEVEL at the jump
2646 context; LOCUS is the source position of the jump or 0. Returns
2647 true if all is well. */
2650 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2651 bool exited_omp, const location_t *locus)
2653 cp_binding_level *b;
2654 bool identified = false, saw_eh = false, saw_omp = false;
2658 identify_goto (decl, locus);
2659 error (" exits OpenMP structured block");
2660 identified = saw_omp = true;
2663 for (b = current_binding_level; b ; b = b->level_chain)
2665 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2667 for (new_decls = b->names; new_decls != old_decls;
2668 new_decls = DECL_CHAIN (new_decls))
2670 int problem = decl_jump_unsafe (new_decls);
2676 identify_goto (decl, locus);
2680 error (" crosses initialization of %q+#D", new_decls);
2682 permerror (input_location, " enters scope of %q+#D which has "
2683 "non-trivial destructor", new_decls);
2688 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2692 identify_goto (decl, locus);
2695 if (b->kind == sk_try)
2696 error (" enters try block");
2698 error (" enters catch block");
2701 if (b->kind == sk_omp && !saw_omp)
2705 identify_goto (decl, locus);
2708 error (" enters OpenMP structured block");
2717 check_previous_goto (tree decl, struct named_label_use_entry *use)
2719 check_previous_goto_1 (decl, use->binding_level,
2720 use->names_in_scope, use->in_omp_scope,
2721 &use->o_goto_locus);
2725 check_switch_goto (cp_binding_level* level)
2727 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2730 /* Check that a new jump to a label DECL is OK. Called by
2731 finish_goto_stmt. */
2734 check_goto (tree decl)
2736 struct named_label_entry *ent, dummy;
2737 bool saw_catch = false, identified = false;
2741 /* We can't know where a computed goto is jumping.
2742 So we assume that it's OK. */
2743 if (TREE_CODE (decl) != LABEL_DECL)
2746 /* We didn't record any information about this label when we created it,
2747 and there's not much point since it's trivial to analyze as a return. */
2748 if (decl == cdtor_label)
2751 dummy.label_decl = decl;
2752 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2753 gcc_assert (ent != NULL);
2755 /* If the label hasn't been defined yet, defer checking. */
2756 if (! DECL_INITIAL (decl))
2758 struct named_label_use_entry *new_use;
2760 /* Don't bother creating another use if the last goto had the
2761 same data, and will therefore create the same set of errors. */
2763 && ent->uses->names_in_scope == current_binding_level->names)
2766 new_use = ggc_alloc_named_label_use_entry ();
2767 new_use->binding_level = current_binding_level;
2768 new_use->names_in_scope = current_binding_level->names;
2769 new_use->o_goto_locus = input_location;
2770 new_use->in_omp_scope = false;
2772 new_use->next = ent->uses;
2773 ent->uses = new_use;
2777 if (ent->in_try_scope || ent->in_catch_scope
2778 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2780 permerror (input_location, "jump to label %q+D", decl);
2781 permerror (input_location, " from here");
2785 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2787 int u = decl_jump_unsafe (bad);
2789 if (u > 1 && DECL_ARTIFICIAL (bad))
2791 /* Can't skip init of __exception_info. */
2792 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2796 error (" skips initialization of %q+#D", bad);
2798 permerror (input_location, " enters scope of %q+#D which has "
2799 "non-trivial destructor", bad);
2802 if (ent->in_try_scope)
2803 error (" enters try block");
2804 else if (ent->in_catch_scope && !saw_catch)
2805 error (" enters catch block");
2807 if (ent->in_omp_scope)
2808 error (" enters OpenMP structured block");
2809 else if (flag_openmp)
2811 cp_binding_level *b;
2812 for (b = current_binding_level; b ; b = b->level_chain)
2814 if (b == ent->binding_level)
2816 if (b->kind == sk_omp)
2820 permerror (input_location, "jump to label %q+D", decl);
2821 permerror (input_location, " from here");
2824 error (" exits OpenMP structured block");
2831 /* Check that a return is ok wrt OpenMP structured blocks.
2832 Called by finish_return_stmt. Returns true if all is well. */
2835 check_omp_return (void)
2837 cp_binding_level *b;
2838 for (b = current_binding_level; b ; b = b->level_chain)
2839 if (b->kind == sk_omp)
2841 error ("invalid exit from OpenMP structured block");
2844 else if (b->kind == sk_function_parms)
2849 /* Define a label, specifying the location in the source file.
2850 Return the LABEL_DECL node for the label. */
2853 define_label_1 (location_t location, tree name)
2855 struct named_label_entry *ent, dummy;
2856 cp_binding_level *p;
2859 decl = lookup_label (name);
2861 dummy.label_decl = decl;
2862 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2863 gcc_assert (ent != NULL);
2865 /* After labels, make any new cleanups in the function go into their
2866 own new (temporary) binding contour. */
2867 for (p = current_binding_level;
2868 p->kind != sk_function_parms;
2870 p->more_cleanups_ok = 0;
2872 if (name == get_identifier ("wchar_t"))
2873 permerror (input_location, "label named wchar_t");
2875 if (DECL_INITIAL (decl) != NULL_TREE)
2877 error ("duplicate label %qD", decl);
2878 return error_mark_node;
2882 struct named_label_use_entry *use;
2884 /* Mark label as having been defined. */
2885 DECL_INITIAL (decl) = error_mark_node;
2886 /* Say where in the source. */
2887 DECL_SOURCE_LOCATION (decl) = location;
2889 ent->binding_level = current_binding_level;
2890 ent->names_in_scope = current_binding_level->names;
2892 for (use = ent->uses; use ; use = use->next)
2893 check_previous_goto (decl, use);
2900 /* Wrapper for define_label_1. */
2903 define_label (location_t location, tree name)
2906 timevar_start (TV_NAME_LOOKUP);
2907 ret = define_label_1 (location, name);
2908 timevar_stop (TV_NAME_LOOKUP);
2915 cp_binding_level *level;
2916 struct cp_switch *next;
2917 /* The SWITCH_STMT being built. */
2919 /* A splay-tree mapping the low element of a case range to the high
2920 element, or NULL_TREE if there is no high element. Used to
2921 determine whether or not a new case label duplicates an old case
2922 label. We need a tree, rather than simply a hash table, because
2923 of the GNU case range extension. */
2927 /* A stack of the currently active switch statements. The innermost
2928 switch statement is on the top of the stack. There is no need to
2929 mark the stack for garbage collection because it is only active
2930 during the processing of the body of a function, and we never
2931 collect at that point. */
2933 static struct cp_switch *switch_stack;
2935 /* Called right after a switch-statement condition is parsed.
2936 SWITCH_STMT is the switch statement being parsed. */
2939 push_switch (tree switch_stmt)
2941 struct cp_switch *p = XNEW (struct cp_switch);
2942 p->level = current_binding_level;
2943 p->next = switch_stack;
2944 p->switch_stmt = switch_stmt;
2945 p->cases = splay_tree_new (case_compare, NULL, NULL);
2952 struct cp_switch *cs = switch_stack;
2953 location_t switch_location;
2955 /* Emit warnings as needed. */
2956 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2957 if (!processing_template_decl)
2958 c_do_switch_warnings (cs->cases, switch_location,
2959 SWITCH_STMT_TYPE (cs->switch_stmt),
2960 SWITCH_STMT_COND (cs->switch_stmt));
2962 splay_tree_delete (cs->cases);
2963 switch_stack = switch_stack->next;
2967 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2968 condition. Note that if TYPE and VALUE are already integral we don't
2969 really do the conversion because the language-independent
2970 warning/optimization code will work better that way. */
2973 case_conversion (tree type, tree value)
2975 if (value == NULL_TREE)
2978 if (cxx_dialect >= cxx0x
2979 && (SCOPED_ENUM_P (type)
2980 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
2982 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2983 type = type_promotes_to (type);
2984 value = perform_implicit_conversion (type, value, tf_warning_or_error);
2986 return cxx_constant_value (value);
2989 /* Note that we've seen a definition of a case label, and complain if this
2990 is a bad place for one. */
2993 finish_case_label (location_t loc, tree low_value, tree high_value)
2996 cp_binding_level *p;
2999 if (processing_template_decl)
3003 /* For templates, just add the case label; we'll do semantic
3004 analysis at instantiation-time. */
3005 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3006 return add_stmt (build_case_label (low_value, high_value, label));
3009 /* Find the condition on which this switch statement depends. */
3010 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3011 if (cond && TREE_CODE (cond) == TREE_LIST)
3012 cond = TREE_VALUE (cond);
3014 if (!check_switch_goto (switch_stack->level))
3015 return error_mark_node;
3017 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3019 low_value = case_conversion (type, low_value);
3020 high_value = case_conversion (type, high_value);
3022 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3023 low_value, high_value);
3025 /* After labels, make any new cleanups in the function go into their
3026 own new (temporary) binding contour. */
3027 for (p = current_binding_level;
3028 p->kind != sk_function_parms;
3030 p->more_cleanups_ok = 0;
3035 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3038 typename_hash (const void* k)
3041 const_tree const t = (const_tree) k;
3043 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3044 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3049 typedef struct typename_info {
3057 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3058 really of type `typename_info*' */
3061 typename_compare (const void * k1, const void * k2)
3063 const_tree const t1 = (const_tree) k1;
3064 const typename_info *const t2 = (const typename_info *) k2;
3066 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3067 && TYPE_CONTEXT (t1) == t2->scope
3068 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3069 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3070 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3073 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3074 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3076 Returns the new TYPENAME_TYPE. */
3078 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3081 build_typename_type (tree context, tree name, tree fullname,
3082 enum tag_types tag_type)
3090 if (typename_htab == NULL)
3091 typename_htab = htab_create_ggc (61, &typename_hash,
3092 &typename_compare, NULL);
3094 ti.scope = FROB_CONTEXT (context);
3096 ti.template_id = fullname;
3097 ti.enum_p = tag_type == enum_type;
3098 ti.class_p = (tag_type == class_type
3099 || tag_type == record_type
3100 || tag_type == union_type);
3101 hash = (htab_hash_pointer (ti.scope)
3102 ^ htab_hash_pointer (ti.name));
3104 /* See if we already have this type. */
3105 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3110 /* Build the TYPENAME_TYPE. */
3111 t = cxx_make_type (TYPENAME_TYPE);
3112 TYPE_CONTEXT (t) = ti.scope;
3113 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3114 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3115 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3117 /* Build the corresponding TYPE_DECL. */
3118 d = build_decl (input_location, TYPE_DECL, name, t);
3119 TYPE_NAME (TREE_TYPE (d)) = d;
3120 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3121 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3122 DECL_ARTIFICIAL (d) = 1;
3124 /* Store it in the hash table. */
3127 /* TYPENAME_TYPEs must always be compared structurally, because
3128 they may or may not resolve down to another type depending on
3129 the currently open classes. */
3130 SET_TYPE_STRUCTURAL_EQUALITY (t);
3136 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3137 provided to name the type. Returns an appropriate type, unless an
3138 error occurs, in which case error_mark_node is returned. If we
3139 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3140 return that, rather than the _TYPE it corresponds to, in other
3141 cases we look through the type decl. If TF_ERROR is set, complain
3142 about errors, otherwise be quiet. */
3145 make_typename_type (tree context, tree name, enum tag_types tag_type,
3146 tsubst_flags_t complain)
3152 if (name == error_mark_node
3153 || context == NULL_TREE
3154 || context == error_mark_node)
3155 return error_mark_node;
3159 if (!(TYPE_LANG_SPECIFIC (name)
3160 && (CLASSTYPE_IS_TEMPLATE (name)
3161 || CLASSTYPE_USE_TEMPLATE (name))))
3162 name = TYPE_IDENTIFIER (name);
3164 /* Create a TEMPLATE_ID_EXPR for the type. */
3165 name = build_nt (TEMPLATE_ID_EXPR,
3166 CLASSTYPE_TI_TEMPLATE (name),
3167 CLASSTYPE_TI_ARGS (name));
3169 else if (TREE_CODE (name) == TYPE_DECL)
3170 name = DECL_NAME (name);
3174 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3176 name = TREE_OPERAND (name, 0);
3177 if (TREE_CODE (name) == TEMPLATE_DECL)
3178 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3179 else if (TREE_CODE (name) == OVERLOAD)
3181 error ("%qD is not a type", name);
3182 return error_mark_node;
3185 if (TREE_CODE (name) == TEMPLATE_DECL)
3187 error ("%qD used without template parameters", name);
3188 return error_mark_node;
3190 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3191 gcc_assert (TYPE_P (context));
3193 if (!MAYBE_CLASS_TYPE_P (context))
3195 if (complain & tf_error)
3196 error ("%q#T is not a class", context);
3197 return error_mark_node;
3200 /* When the CONTEXT is a dependent type, NAME could refer to a
3201 dependent base class of CONTEXT. But look inside it anyway
3202 if CONTEXT is a currently open scope, in case it refers to a
3203 member of the current instantiation or a non-dependent base;
3204 lookup will stop when we hit a dependent base. */
3205 if (!dependent_scope_p (context))
3206 /* We should only set WANT_TYPE when we're a nested typename type.
3207 Then we can give better diagnostics if we find a non-type. */
3208 t = lookup_field (context, name, 2, /*want_type=*/true);
3212 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3213 return build_typename_type (context, name, fullname, tag_type);
3215 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3219 if (complain & tf_error)
3220 error (want_template ? "no class template named %q#T in %q#T"
3221 : "no type named %q#T in %q#T", name, context);
3222 return error_mark_node;
3225 /* Pull out the template from an injected-class-name (or multiple). */
3227 t = maybe_get_template_decl_from_type_decl (t);
3229 if (TREE_CODE (t) == TREE_LIST)
3231 if (complain & tf_error)
3233 error ("lookup of %qT in %qT is ambiguous", name, context);
3234 print_candidates (t);
3236 return error_mark_node;
3239 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3241 if (complain & tf_error)
3242 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3244 return error_mark_node;
3246 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3248 if (complain & tf_error)
3249 error ("%<typename %T::%D%> names %q#T, which is not a type",
3251 return error_mark_node;
3254 if (complain & tf_error)
3255 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3257 /* If we are currently parsing a template and if T is a typedef accessed
3258 through CONTEXT then we need to remember and check access of T at
3259 template instantiation time. */
3260 add_typedef_to_current_template_for_access_check (t, context, input_location);
3263 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3265 /*entering_scope=*/0,
3266 tf_warning_or_error | tf_user);
3268 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3274 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3275 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3276 in which case error_mark_node is returned.
3278 If PARM_LIST is non-NULL, also make sure that the template parameter
3279 list of TEMPLATE_DECL matches.
3281 If COMPLAIN zero, don't complain about any errors that occur. */
3284 make_unbound_class_template (tree context, tree name, tree parm_list,
3285 tsubst_flags_t complain)
3291 name = TYPE_IDENTIFIER (name);
3292 else if (DECL_P (name))
3293 name = DECL_NAME (name);
3294 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3296 if (!dependent_type_p (context)
3297 || currently_open_class (context))
3299 tree tmpl = NULL_TREE;
3301 if (MAYBE_CLASS_TYPE_P (context))
3302 tmpl = lookup_field (context, name, 0, false);
3304 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3305 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3307 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3309 if (complain & tf_error)
3310 error ("no class template named %q#T in %q#T", name, context);
3311 return error_mark_node;
3315 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3317 if (complain & tf_error)
3319 error ("template parameters do not match template");
3320 error ("%q+D declared here", tmpl);
3322 return error_mark_node;
3325 if (complain & tf_error)
3326 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3331 /* Build the UNBOUND_CLASS_TEMPLATE. */
3332 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3333 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3334 TREE_TYPE (t) = NULL_TREE;
3335 SET_TYPE_STRUCTURAL_EQUALITY (t);
3337 /* Build the corresponding TEMPLATE_DECL. */
3338 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3339 TYPE_NAME (TREE_TYPE (d)) = d;
3340 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3341 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3342 DECL_ARTIFICIAL (d) = 1;
3343 DECL_TEMPLATE_PARMS (d) = parm_list;
3350 /* Push the declarations of builtin types into the namespace.
3351 RID_INDEX is the index of the builtin type in the array
3352 RID_POINTERS. NAME is the name used when looking up the builtin
3353 type. TYPE is the _TYPE node for the builtin type. */
3356 record_builtin_type (enum rid rid_index,
3360 tree rname = NULL_TREE, tname = NULL_TREE;
3361 tree tdecl = NULL_TREE;
3363 if ((int) rid_index < (int) RID_MAX)
3364 rname = ridpointers[(int) rid_index];
3366 tname = get_identifier (name);
3368 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3369 eliminated. Built-in types should not be looked up name; their
3370 names are keywords that the parser can recognize. However, there
3371 is code in c-common.c that uses identifier_global_value to look
3372 up built-in types by name. */
3375 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3376 DECL_ARTIFICIAL (tdecl) = 1;
3377 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3383 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3384 DECL_ARTIFICIAL (tdecl) = 1;
3386 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3389 if (!TYPE_NAME (type))
3390 TYPE_NAME (type) = tdecl;
3393 debug_hooks->type_decl (tdecl, 0);
3396 /* Record one of the standard Java types.
3397 * Declare it as having the given NAME.
3398 * If SIZE > 0, it is the size of one of the integral types;
3399 * otherwise it is the negative of the size of one of the other types. */
3402 record_builtin_java_type (const char* name, int size)
3407 type = build_nonstandard_integer_type (size, 0);
3408 type = build_distinct_type_copy (type);
3410 else if (size > -32)
3413 /* "__java_char" or ""__java_boolean". */
3414 type = build_nonstandard_integer_type (-size, 1);
3415 type = build_distinct_type_copy (type);
3416 /* Get the signed type cached and attached to the unsigned type,
3417 so it doesn't get garbage-collected at "random" times,
3418 causing potential codegen differences out of different UIDs
3419 and different alias set numbers. */
3420 stype = build_nonstandard_integer_type (-size, 0);
3421 stype = build_distinct_type_copy (stype);
3422 TREE_CHAIN (type) = stype;
3423 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3426 { /* "__java_float" or ""__java_double". */
3427 type = make_node (REAL_TYPE);
3428 TYPE_PRECISION (type) = - size;
3431 record_builtin_type (RID_MAX, name, type);
3432 decl = TYPE_NAME (type);
3434 /* Suppress generate debug symbol entries for these types,
3435 since for normal C++ they are just clutter.
3436 However, push_lang_context undoes this if extern "Java" is seen. */
3437 DECL_IGNORED_P (decl) = 1;
3439 TYPE_FOR_JAVA (type) = 1;
3443 /* Push a type into the namespace so that the back ends ignore it. */
3446 record_unknown_type (tree type, const char* name)
3448 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3449 TYPE_DECL, get_identifier (name), type));
3450 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3451 DECL_IGNORED_P (decl) = 1;
3452 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3453 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3454 TYPE_ALIGN (type) = 1;
3455 TYPE_USER_ALIGN (type) = 0;
3456 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3459 /* A string for which we should create an IDENTIFIER_NODE at
3462 typedef struct predefined_identifier
3464 /* The name of the identifier. */
3465 const char *const name;
3466 /* The place where the IDENTIFIER_NODE should be stored. */
3468 /* Nonzero if this is the name of a constructor or destructor. */
3469 const int ctor_or_dtor_p;
3470 } predefined_identifier;
3472 /* Create all the predefined identifiers. */
3475 initialize_predefined_identifiers (void)
3477 const predefined_identifier *pid;
3479 /* A table of identifiers to create at startup. */
3480 static const predefined_identifier predefined_identifiers[] = {
3481 { "C++", &lang_name_cplusplus, 0 },
3482 { "C", &lang_name_c, 0 },
3483 { "Java", &lang_name_java, 0 },
3484 /* Some of these names have a trailing space so that it is
3485 impossible for them to conflict with names written by users. */
3486 { "__ct ", &ctor_identifier, 1 },
3487 { "__base_ctor ", &base_ctor_identifier, 1 },
3488 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3489 { "__dt ", &dtor_identifier, 1 },
3490 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3491 { "__base_dtor ", &base_dtor_identifier, 1 },
3492 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3493 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3494 { "nelts", &nelts_identifier, 0 },
3495 { THIS_NAME, &this_identifier, 0 },
3496 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3497 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3498 { "_vptr", &vptr_identifier, 0 },
3499 { "__vtt_parm", &vtt_parm_identifier, 0 },
3500 { "::", &global_scope_name, 0 },
3501 { "std", &std_identifier, 0 },
3505 for (pid = predefined_identifiers; pid->name; ++pid)
3507 *pid->node = get_identifier (pid->name);
3508 if (pid->ctor_or_dtor_p)
3509 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3513 /* Create the predefined scalar types of C,
3514 and some nodes representing standard constants (0, 1, (void *)0).
3515 Initialize the global binding level.
3516 Make definitions for built-in primitive functions. */
3519 cxx_init_decl_processing (void)
3522 tree void_ftype_ptr;
3524 /* Create all the identifiers we need. */
3525 initialize_predefined_identifiers ();
3527 /* Create the global variables. */
3528 push_to_top_level ();
3530 current_function_decl = NULL_TREE;
3531 current_binding_level = NULL;
3532 /* Enter the global namespace. */
3533 gcc_assert (global_namespace == NULL_TREE);
3534 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3536 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3537 TREE_PUBLIC (global_namespace) = 1;
3538 begin_scope (sk_namespace, global_namespace);
3540 if (flag_visibility_ms_compat)
3541 default_visibility = VISIBILITY_HIDDEN;
3544 current_lang_name = lang_name_c;
3546 /* Create the `std' namespace. */
3547 push_namespace (std_identifier);
3548 std_node = current_namespace;
3551 c_common_nodes_and_builtins ();
3553 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3554 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3555 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3556 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3557 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3558 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3559 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3560 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3562 integer_two_node = build_int_cst (NULL_TREE, 2);
3564 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3565 truthvalue_type_node = boolean_type_node;
3566 truthvalue_false_node = boolean_false_node;
3567 truthvalue_true_node = boolean_true_node;
3569 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3570 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3571 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3574 record_builtin_type (RID_MAX, NULL, string_type_node);
3577 delta_type_node = ptrdiff_type_node;
3578 vtable_index_type = ptrdiff_type_node;
3580 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3581 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3582 void_ftype_ptr = build_function_type_list (void_type_node,
3583 ptr_type_node, NULL_TREE);
3585 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3587 /* C++ extensions */
3589 unknown_type_node = make_node (LANG_TYPE);
3590 record_unknown_type (unknown_type_node, "unknown type");
3592 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3593 TREE_TYPE (unknown_type_node) = unknown_type_node;
3595 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3597 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3598 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3600 init_list_type_node = make_node (LANG_TYPE);
3601 record_unknown_type (init_list_type_node, "init list");
3603 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3604 record_unknown_type (dependent_lambda_return_type_node,
3605 "undeduced lambda return type");
3608 /* Make sure we get a unique function type, so we can give
3609 its pointer type a name. (This wins for gdb.) */
3610 tree vfunc_type = make_node (FUNCTION_TYPE);
3611 TREE_TYPE (vfunc_type) = integer_type_node;
3612 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3613 layout_type (vfunc_type);
3615 vtable_entry_type = build_pointer_type (vfunc_type);
3617 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3620 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3621 layout_type (vtbl_type_node);
3622 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3623 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3624 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3625 layout_type (vtbl_ptr_type_node);
3626 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3628 push_namespace (get_identifier ("__cxxabiv1"));
3629 abi_node = current_namespace;
3632 global_type_node = make_node (LANG_TYPE);
3633 record_unknown_type (global_type_node, "global type");
3636 current_lang_name = lang_name_cplusplus;
3640 tree newtype, deltype;
3641 tree ptr_ftype_sizetype;
3645 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3646 if (cxx_dialect == cxx98)
3649 tree bad_alloc_type_node;
3650 tree bad_alloc_decl;
3652 push_namespace (std_identifier);
3653 bad_alloc_id = get_identifier ("bad_alloc");
3654 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3655 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3657 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3658 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3662 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3665 new_eh_spec = noexcept_false_spec;
3667 /* Ensure attribs.c is initialized. */
3670 = build_tree_list (get_identifier ("alloc_size"),
3671 build_tree_list (NULL_TREE, integer_one_node));
3672 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3673 newtype = build_exception_variant (newtype, new_eh_spec);
3674 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3675 push_cp_library_fn (NEW_EXPR, newtype);
3676 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3677 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3678 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3680 nullptr_type_node = make_node (NULLPTR_TYPE);
3681 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3682 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3683 TYPE_UNSIGNED (nullptr_type_node) = 1;
3684 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3685 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3686 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3687 nullptr_node = build_int_cst (nullptr_type_node, 0);
3691 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3693 /* Perform other language dependent initializations. */
3694 init_class_processing ();
3695 init_rtti_processing ();
3696 init_template_processing ();
3698 if (flag_exceptions)
3699 init_exception_processing ();
3701 if (! supports_one_only ())
3704 make_fname_decl = cp_make_fname_decl;
3705 start_fname_decls ();
3707 /* Show we use EH for cleanups. */
3708 if (flag_exceptions)
3709 using_eh_for_cleanups ();
3712 /* Generate an initializer for a function naming variable from
3713 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3714 filled in with the type of the init. */
3717 cp_fname_init (const char* name, tree *type_p)
3719 tree domain = NULL_TREE;
3721 tree init = NULL_TREE;
3726 length = strlen (name);
3727 domain = build_index_type (size_int (length));
3728 init = build_string (length + 1, name);
3731 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3732 type = build_cplus_array_type (type, domain);
3737 TREE_TYPE (init) = type;
3739 init = error_mark_node;
3744 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3745 the decl, LOC is the location to give the decl, NAME is the
3746 initialization string and TYPE_DEP indicates whether NAME depended
3747 on the type of the function. We make use of that to detect
3748 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3749 at the point of first use, so we mustn't push the decl now. */
3752 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3754 const char *const name = (type_dep && processing_template_decl
3755 ? NULL : fname_as_string (type_dep));
3757 tree init = cp_fname_init (name, &type);
3758 tree decl = build_decl (loc, VAR_DECL, id, type);
3761 free (CONST_CAST (char *, name));
3763 /* As we're using pushdecl_with_scope, we must set the context. */
3764 DECL_CONTEXT (decl) = current_function_decl;
3765 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3767 TREE_STATIC (decl) = 1;
3768 TREE_READONLY (decl) = 1;
3769 DECL_ARTIFICIAL (decl) = 1;
3771 TREE_USED (decl) = 1;
3773 if (current_function_decl)
3775 cp_binding_level *b = current_binding_level;
3776 if (b->kind == sk_function_parms)
3777 return error_mark_node;
3778 while (b->level_chain->kind != sk_function_parms)
3780 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3781 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3782 LOOKUP_ONLYCONVERTING);
3786 DECL_THIS_STATIC (decl) = true;
3787 pushdecl_top_level_and_finish (decl, init);
3794 builtin_function_1 (tree decl, tree context, bool is_global)
3796 tree id = DECL_NAME (decl);
3797 const char *name = IDENTIFIER_POINTER (id);
3799 retrofit_lang_decl (decl);
3801 DECL_ARTIFICIAL (decl) = 1;
3802 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3803 SET_DECL_LANGUAGE (decl, lang_c);
3804 /* Runtime library routines are, by definition, available in an
3805 external shared object. */
3806 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3807 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3809 DECL_CONTEXT (decl) = context;
3812 pushdecl_top_level (decl);
3816 /* A function in the user's namespace should have an explicit
3817 declaration before it is used. Mark the built-in function as
3818 anticipated but not actually declared. */
3819 if (name[0] != '_' || name[1] != '_')
3820 DECL_ANTICIPATED (decl) = 1;
3821 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3823 size_t len = strlen (name);
3825 /* Treat __*_chk fortification functions as anticipated as well,
3826 unless they are __builtin_*. */
3827 if (len > strlen ("___chk")
3828 && memcmp (name + len - strlen ("_chk"),
3829 "_chk", strlen ("_chk") + 1) == 0)
3830 DECL_ANTICIPATED (decl) = 1;
3837 cxx_builtin_function (tree decl)
3839 tree id = DECL_NAME (decl);
3840 const char *name = IDENTIFIER_POINTER (id);
3841 /* All builtins that don't begin with an '_' should additionally
3842 go in the 'std' namespace. */
3845 tree decl2 = copy_node(decl);
3846 push_namespace (std_identifier);
3847 builtin_function_1 (decl2, std_node, false);
3851 return builtin_function_1 (decl, NULL_TREE, false);
3854 /* Like cxx_builtin_function, but guarantee the function is added to the global
3855 scope. This is to allow function specific options to add new machine
3856 dependent builtins when the target ISA changes via attribute((target(...)))
3857 which saves space on program startup if the program does not use non-generic
3861 cxx_builtin_function_ext_scope (tree decl)
3864 tree id = DECL_NAME (decl);
3865 const char *name = IDENTIFIER_POINTER (id);
3866 /* All builtins that don't begin with an '_' should additionally
3867 go in the 'std' namespace. */
3870 tree decl2 = copy_node(decl);
3871 push_namespace (std_identifier);
3872 builtin_function_1 (decl2, std_node, true);
3876 return builtin_function_1 (decl, NULL_TREE, true);
3879 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3880 function. Not called directly. */
3883 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3885 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3886 DECL_EXTERNAL (fn) = 1;
3887 TREE_PUBLIC (fn) = 1;
3888 DECL_ARTIFICIAL (fn) = 1;
3889 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3890 SET_DECL_LANGUAGE (fn, lang_c);
3891 /* Runtime library routines are, by definition, available in an
3892 external shared object. */
3893 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3894 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3898 /* Returns the _DECL for a library function with C linkage.
3899 We assume that such functions never throw; if this is incorrect,
3900 callers should unset TREE_NOTHROW. */
3903 build_library_fn (tree name, tree type)
3905 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3906 TREE_NOTHROW (fn) = 1;
3910 /* Returns the _DECL for a library function with C++ linkage. */
3913 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3915 tree fn = build_library_fn_1 (name, operator_code, type);
3916 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3917 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3918 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3922 /* Like build_library_fn, but takes a C string instead of an
3926 build_library_fn_ptr (const char* name, tree type)
3928 return build_library_fn (get_identifier (name), type);
3931 /* Like build_cp_library_fn, but takes a C string instead of an
3935 build_cp_library_fn_ptr (const char* name, tree type)
3937 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3940 /* Like build_library_fn, but also pushes the function so that we will
3941 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3942 may throw exceptions listed in RAISES. */
3945 push_library_fn (tree name, tree type, tree raises)
3950 type = build_exception_variant (type, raises);
3952 fn = build_library_fn (name, type);
3953 pushdecl_top_level (fn);
3957 /* Like build_cp_library_fn, but also pushes the function so that it
3958 will be found by normal lookup. */
3961 push_cp_library_fn (enum tree_code operator_code, tree type)
3963 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3970 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3974 push_void_library_fn (tree name, tree parmtypes)
3976 tree type = build_function_type (void_type_node, parmtypes);
3977 return push_library_fn (name, type, NULL_TREE);
3980 /* Like push_library_fn, but also note that this function throws
3981 and does not return. Used for __throw_foo and the like. */
3984 push_throw_library_fn (tree name, tree type)
3986 tree fn = push_library_fn (name, type, NULL_TREE);
3987 TREE_THIS_VOLATILE (fn) = 1;
3988 TREE_NOTHROW (fn) = 0;
3992 /* When we call finish_struct for an anonymous union, we create
3993 default copy constructors and such. But, an anonymous union
3994 shouldn't have such things; this function undoes the damage to the
3995 anonymous union type T.
3997 (The reason that we create the synthesized methods is that we don't
3998 distinguish `union { int i; }' from `typedef union { int i; } U'.
3999 The first is an anonymous union; the second is just an ordinary
4003 fixup_anonymous_aggr (tree t)
4007 /* Wipe out memory of synthesized methods. */
4008 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4009 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4010 TYPE_HAS_COPY_CTOR (t) = 0;
4011 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4012 TYPE_HAS_COPY_ASSIGN (t) = 0;
4013 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4015 /* Splice the implicitly generated functions out of the TYPE_METHODS
4017 q = &TYPE_METHODS (t);
4020 if (DECL_ARTIFICIAL (*q))
4021 *q = TREE_CHAIN (*q);
4023 q = &DECL_CHAIN (*q);
4026 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4027 if (TYPE_METHODS (t))
4029 tree decl = TYPE_MAIN_DECL (t);
4031 if (TREE_CODE (t) != UNION_TYPE)
4032 error_at (DECL_SOURCE_LOCATION (decl),
4033 "an anonymous struct cannot have function members");
4035 error_at (DECL_SOURCE_LOCATION (decl),
4036 "an anonymous union cannot have function members");
4039 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4040 assignment operators (because they cannot have these methods themselves).
4041 For anonymous unions this is already checked because they are not allowed
4042 in any union, otherwise we have to check it. */
4043 if (TREE_CODE (t) != UNION_TYPE)
4047 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4048 if (TREE_CODE (field) == FIELD_DECL)
4050 type = TREE_TYPE (field);
4051 if (CLASS_TYPE_P (type))
4053 if (TYPE_NEEDS_CONSTRUCTING (type))
4054 error ("member %q+#D with constructor not allowed "
4055 "in anonymous aggregate", field);
4056 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4057 error ("member %q+#D with destructor not allowed "
4058 "in anonymous aggregate", field);
4059 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4060 error ("member %q+#D with copy assignment operator "
4061 "not allowed in anonymous aggregate", field);
4067 /* Make sure that a declaration with no declarator is well-formed, i.e.
4068 just declares a tagged type or anonymous union.
4070 Returns the type declared; or NULL_TREE if none. */
4073 check_tag_decl (cp_decl_specifier_seq *declspecs)
4075 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4076 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4077 /* If a class, struct, or enum type is declared by the DECLSPECS
4078 (i.e, if a class-specifier, enum-specifier, or non-typename
4079 elaborated-type-specifier appears in the DECLSPECS),
4080 DECLARED_TYPE is set to the corresponding type. */
4081 tree declared_type = NULL_TREE;
4082 bool error_p = false;
4084 if (declspecs->multiple_types_p)
4085 error ("multiple types in one declaration");
4086 else if (declspecs->redefined_builtin_type)
4088 if (!in_system_header)
4089 permerror (input_location, "redeclaration of C++ built-in type %qT",
4090 declspecs->redefined_builtin_type);
4095 && TYPE_P (declspecs->type)
4096 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4097 && MAYBE_CLASS_TYPE_P (declspecs->type))
4098 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4099 declared_type = declspecs->type;
4100 else if (declspecs->type == error_mark_node)
4102 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4103 permerror (input_location, "declaration does not declare anything");
4104 /* Check for an anonymous union. */
4105 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4106 && TYPE_ANONYMOUS_P (declared_type))
4108 /* 7/3 In a simple-declaration, the optional init-declarator-list
4109 can be omitted only when declaring a class (clause 9) or
4110 enumeration (7.2), that is, when the decl-specifier-seq contains
4111 either a class-specifier, an elaborated-type-specifier with
4112 a class-key (9.1), or an enum-specifier. In these cases and
4113 whenever a class-specifier or enum-specifier is present in the
4114 decl-specifier-seq, the identifiers in these specifiers are among
4115 the names being declared by the declaration (as class-name,
4116 enum-names, or enumerators, depending on the syntax). In such
4117 cases, and except for the declaration of an unnamed bit-field (9.6),
4118 the decl-specifier-seq shall introduce one or more names into the
4119 program, or shall redeclare a name introduced by a previous
4120 declaration. [Example:
4121 enum { }; // ill-formed
4122 typedef class { }; // ill-formed
4126 error ("missing type-name in typedef-declaration");
4129 /* Anonymous unions are objects, so they can have specifiers. */;
4130 SET_ANON_AGGR_TYPE_P (declared_type);
4132 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4133 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4138 if (declspecs->specs[(int)ds_inline]
4139 || declspecs->specs[(int)ds_virtual])
4140 error ("%qs can only be specified for functions",
4141 declspecs->specs[(int)ds_inline]
4142 ? "inline" : "virtual");
4144 && (!current_class_type
4145 || current_scope () != current_class_type))
4146 error ("%<friend%> can only be specified inside a class");
4147 else if (declspecs->specs[(int)ds_explicit])
4148 error ("%<explicit%> can only be specified for constructors");
4149 else if (declspecs->storage_class)
4150 error ("a storage class can only be specified for objects "
4152 else if (declspecs->specs[(int)ds_const]
4153 || declspecs->specs[(int)ds_volatile]
4154 || declspecs->specs[(int)ds_restrict]
4155 || declspecs->specs[(int)ds_thread])
4156 error ("qualifiers can only be specified for objects "
4158 else if (saw_typedef)
4159 warning (0, "%<typedef%> was ignored in this declaration");
4160 else if (declspecs->specs[(int) ds_constexpr])
4161 error ("%<constexpr%> cannot be used for type declarations");
4164 return declared_type;
4167 /* Called when a declaration is seen that contains no names to declare.
4168 If its type is a reference to a structure, union or enum inherited
4169 from a containing scope, shadow that tag name for the current scope
4170 with a forward reference.
4171 If its type defines a new named structure or union
4172 or defines an enum, it is valid but we need not do anything here.
4173 Otherwise, it is an error.
4175 C++: may have to grok the declspecs to learn about static,
4176 complain for anonymous unions.
4178 Returns the TYPE declared -- or NULL_TREE if none. */
4181 shadow_tag (cp_decl_specifier_seq *declspecs)
4183 tree t = check_tag_decl (declspecs);
4188 if (declspecs->attributes)
4190 warning (0, "attribute ignored in declaration of %q+#T", t);
4191 warning (0, "attribute for %q+#T must follow the %qs keyword",
4192 t, class_key_or_enum_as_string (t));
4196 if (maybe_process_partial_specialization (t) == error_mark_node)
4199 /* This is where the variables in an anonymous union are
4200 declared. An anonymous union declaration looks like:
4202 because there is no declarator after the union, the parser
4203 sends that declaration here. */
4204 if (ANON_AGGR_TYPE_P (t))
4206 fixup_anonymous_aggr (t);
4208 if (TYPE_FIELDS (t))
4210 tree decl = grokdeclarator (/*declarator=*/NULL,
4211 declspecs, NORMAL, 0, NULL);
4212 finish_anon_union (decl);
4219 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4222 groktypename (cp_decl_specifier_seq *type_specifiers,
4223 const cp_declarator *declarator,
4224 bool is_template_arg)
4228 enum decl_context context
4229 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4230 attrs = type_specifiers->attributes;
4231 type_specifiers->attributes = NULL_TREE;
4232 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4233 if (attrs && type != error_mark_node)
4235 if (CLASS_TYPE_P (type))
4236 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4237 "outside of definition", type);
4238 else if (MAYBE_CLASS_TYPE_P (type))
4239 /* A template type parameter or other dependent type. */
4240 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4241 "type %qT without an associated declaration", type);
4243 cplus_decl_attributes (&type, attrs, 0);
4248 /* Process a DECLARATOR for a function-scope variable declaration,
4249 namespace-scope variable declaration, or function declaration.
4250 (Function definitions go through start_function; class member
4251 declarations appearing in the body of the class go through
4252 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4253 If an error occurs, the error_mark_node is returned instead.
4255 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4256 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4257 for an explicitly defaulted function, or SD_DELETED for an explicitly
4258 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4259 implicitly initialized via a default constructor. ATTRIBUTES and
4260 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4261 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4262 set, the caller is responsible for calling pop_scope. */
4265 start_decl (const cp_declarator *declarator,
4266 cp_decl_specifier_seq *declspecs,
4269 tree prefix_attributes,
4270 tree *pushed_scope_p)
4278 *pushed_scope_p = NULL_TREE;
4280 /* An object declared as __attribute__((deprecated)) suppresses
4281 warnings of uses of other deprecated items. */
4282 if (lookup_attribute ("deprecated", attributes))
4283 deprecated_state = DEPRECATED_SUPPRESS;
4285 attributes = chainon (attributes, prefix_attributes);
4287 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4290 deprecated_state = DEPRECATED_NORMAL;
4292 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4293 || decl == error_mark_node)
4294 return error_mark_node;
4296 context = CP_DECL_CONTEXT (decl);
4297 if (context != global_namespace)
4298 *pushed_scope_p = push_scope (context);
4301 /* Is it valid for this decl to have an initializer at all?
4302 If not, set INITIALIZED to zero, which will indirectly
4303 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4304 switch (TREE_CODE (decl))
4307 error ("typedef %qD is initialized (use decltype instead)", decl);
4308 return error_mark_node;
4311 if (initialized == SD_DELETED)
4312 /* We'll handle the rest of the semantics later, but we need to
4313 set this now so it's visible to duplicate_decls. */
4314 DECL_DELETED_FN (decl) = 1;
4323 if (! toplevel_bindings_p ()
4324 && DECL_EXTERNAL (decl))
4325 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4327 DECL_EXTERNAL (decl) = 0;
4328 if (toplevel_bindings_p ())
4329 TREE_STATIC (decl) = 1;
4331 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4333 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4334 record_key_method_defined (decl);
4336 /* If this is a typedef that names the class for linkage purposes
4337 (7.1.3p8), apply any attributes directly to the type. */
4338 if (TREE_CODE (decl) == TYPE_DECL
4339 && TAGGED_TYPE_P (TREE_TYPE (decl))
4340 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4341 flags = ATTR_FLAG_TYPE_IN_PLACE;
4345 /* Set attributes here so if duplicate decl, will have proper attributes. */
4346 cplus_decl_attributes (&decl, attributes, flags);
4348 /* Dllimported symbols cannot be defined. Static data members (which
4349 can be initialized in-class and dllimported) go through grokfield,
4350 not here, so we don't need to exclude those decls when checking for
4352 if (initialized && DECL_DLLIMPORT_P (decl))
4354 error ("definition of %q#D is marked %<dllimport%>", decl);
4355 DECL_DLLIMPORT_P (decl) = 0;
4358 /* If #pragma weak was used, mark the decl weak now. */
4359 maybe_apply_pragma_weak (decl);
4361 if (TREE_CODE (decl) == FUNCTION_DECL
4362 && DECL_DECLARED_INLINE_P (decl)
4363 && DECL_UNINLINABLE (decl)
4364 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4365 warning (0, "inline function %q+D given attribute noinline", decl);
4367 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4369 if (TREE_CODE (decl) == VAR_DECL)
4371 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4372 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4373 error ("%q#D is not a static member of %q#T", decl, context);
4376 if (DECL_CONTEXT (field) != context)
4378 if (!same_type_p (DECL_CONTEXT (field), context))
4379 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4380 "to be defined as %<%T::%D%>",
4381 DECL_CONTEXT (field), DECL_NAME (decl),
4382 context, DECL_NAME (decl));
4383 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4385 if (processing_specialization
4386 && template_class_depth (context) == 0
4387 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4388 error ("template header not allowed in member definition "
4389 "of explicitly specialized class");
4390 /* Static data member are tricky; an in-class initialization
4391 still doesn't provide a definition, so the in-class
4392 declaration will have DECL_EXTERNAL set, but will have an
4393 initialization. Thus, duplicate_decls won't warn
4394 about this situation, and so we check here. */
4395 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4396 error ("duplicate initialization of %qD", decl);
4397 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4399 if (declspecs->specs[(int) ds_constexpr]
4400 && !DECL_DECLARED_CONSTEXPR_P (field))
4401 error ("%qD declared %<constexpr%> outside its class", field);
4406 tree field = check_classfn (context, decl,
4407 (processing_template_decl
4408 > template_class_depth (context))
4409 ? current_template_parms
4411 if (field && field != error_mark_node
4412 && duplicate_decls (decl, field,
4413 /*newdecl_is_friend=*/false))
4417 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4418 DECL_IN_AGGR_P (decl) = 0;
4419 /* Do not mark DECL as an explicit specialization if it was not
4420 already marked as an instantiation; a declaration should
4421 never be marked as a specialization unless we know what
4422 template is being specialized. */
4423 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4425 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4427 /* [temp.expl.spec] An explicit specialization of a static data
4428 member of a template is a definition if the declaration
4429 includes an initializer; otherwise, it is a declaration.
4431 We check for processing_specialization so this only applies
4432 to the new specialization syntax. */
4433 if (!initialized && processing_specialization)
4434 DECL_EXTERNAL (decl) = 1;
4437 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4438 /* Aliases are definitions. */
4440 permerror (input_location, "declaration of %q#D outside of class is not definition",
4444 was_public = TREE_PUBLIC (decl);
4446 /* Enter this declaration into the symbol table. */
4447 decl = maybe_push_decl (decl);
4449 if (processing_template_decl)
4450 decl = push_template_decl (decl);
4451 if (decl == error_mark_node)
4452 return error_mark_node;
4454 /* Tell the back end to use or not use .common as appropriate. If we say
4455 -fconserve-space, we want this to save .data space, at the expense of
4456 wrong semantics. If we say -fno-conserve-space, we want this to
4457 produce errors about redefs; to do this we force variables into the
4459 if (flag_conserve_space
4460 && TREE_CODE (decl) == VAR_DECL
4461 && TREE_PUBLIC (decl)
4462 && !DECL_THREAD_LOCAL_P (decl)
4463 && !have_global_bss_p ())
4464 DECL_COMMON (decl) = 1;
4466 if (TREE_CODE (decl) == VAR_DECL
4467 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4468 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4470 /* This is a const variable with implicit 'static'. Set
4471 DECL_THIS_STATIC so we can tell it from variables that are
4472 !TREE_PUBLIC because of the anonymous namespace. */
4473 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4474 DECL_THIS_STATIC (decl) = 1;
4477 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4478 start_decl_1 (decl, initialized);
4483 /* Process the declaration of a variable DECL. INITIALIZED is true
4484 iff DECL is explicitly initialized. (INITIALIZED is false if the
4485 variable is initialized via an implicitly-called constructor.)
4486 This function must be called for ordinary variables (including, for
4487 example, implicit instantiations of templates), but must not be
4488 called for template declarations. */
4491 start_decl_1 (tree decl, bool initialized)
4495 bool aggregate_definition_p;
4497 gcc_assert (!processing_template_decl);
4499 if (error_operand_p (decl))
4502 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4504 type = TREE_TYPE (decl);
4505 complete_p = COMPLETE_TYPE_P (type);
4506 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4508 /* If an explicit initializer is present, or if this is a definition
4509 of an aggregate, then we need a complete type at this point.
4510 (Scalars are always complete types, so there is nothing to
4511 check.) This code just sets COMPLETE_P; errors (if necessary)
4512 are issued below. */
4513 if ((initialized || aggregate_definition_p)
4515 && COMPLETE_TYPE_P (complete_type (type)))
4518 /* We will not yet have set TREE_READONLY on DECL if the type
4519 was "const", but incomplete, before this point. But, now, we
4520 have a complete type, so we can try again. */
4521 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4525 /* Is it valid for this decl to have an initializer at all? */
4527 /* Don't allow initializations for incomplete types except for
4528 arrays which might be completed by the initialization. */
4530 ; /* A complete type is ok. */
4531 else if (type_uses_auto (type))
4532 ; /* An auto type is ok. */
4533 else if (TREE_CODE (type) != ARRAY_TYPE)
4535 error ("variable %q#D has initializer but incomplete type", decl);
4536 type = TREE_TYPE (decl) = error_mark_node;
4538 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4540 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4541 error ("elements of array %q#D have incomplete type", decl);
4542 /* else we already gave an error in start_decl. */
4545 else if (aggregate_definition_p && !complete_p)
4547 if (type_uses_auto (type))
4548 error ("declaration of %q#D has no initializer", decl);
4550 error ("aggregate %q#D has incomplete type and cannot be defined",
4552 /* Change the type so that assemble_variable will give
4553 DECL an rtl we can live with: (mem (const_int 0)). */
4554 type = TREE_TYPE (decl) = error_mark_node;
4557 /* Create a new scope to hold this declaration if necessary.
4558 Whether or not a new scope is necessary cannot be determined
4559 until after the type has been completed; if the type is a
4560 specialization of a class template it is not until after
4561 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4562 will be set correctly. */
4563 maybe_push_cleanup_level (type);
4566 /* Handle initialization of references. DECL, TYPE, and INIT have the
4567 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4568 but will be set to a new CLEANUP_STMT if a temporary is created
4569 that must be destroyed subsequently.
4571 Returns an initializer expression to use to initialize DECL, or
4572 NULL if the initialization can be performed statically.
4574 Quotes on semantics can be found in ARM 8.4.3. */
4577 grok_reference_init (tree decl, tree type, tree init, tree *cleanup,
4582 if (init == NULL_TREE)
4584 if ((DECL_LANG_SPECIFIC (decl) == 0
4585 || DECL_IN_AGGR_P (decl) == 0)
4586 && ! DECL_THIS_EXTERN (decl))
4587 error ("%qD declared as reference but not initialized", decl);
4591 if (TREE_CODE (init) == TREE_LIST)
4592 init = build_x_compound_expr_from_list (init, ELK_INIT,
4593 tf_warning_or_error);
4595 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4596 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4597 /* Note: default conversion is only called in very special cases. */
4598 init = decay_conversion (init);
4600 /* Convert INIT to the reference type TYPE. This may involve the
4601 creation of a temporary, whose lifetime must be the same as that
4602 of the reference. If so, a DECL_EXPR for the temporary will be
4603 added just after the DECL_EXPR for DECL. That's why we don't set
4604 DECL_INITIAL for local references (instead assigning to them
4605 explicitly); we need to allow the temporary to be initialized
4607 tmp = initialize_reference (type, init, decl, cleanup, flags,
4608 tf_warning_or_error);
4609 if (DECL_DECLARED_CONSTEXPR_P (decl))
4611 tmp = cxx_constant_value (tmp);
4612 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4613 = reduced_constant_expression_p (tmp);
4616 if (tmp == error_mark_node)
4618 else if (tmp == NULL_TREE)
4620 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4624 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4627 DECL_INITIAL (decl) = tmp;
4632 /* Subroutine of check_initializer. We're initializing a DECL of
4633 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4634 extend the lifetime of the underlying array to match that of the decl,
4635 just like for reference initialization. CLEANUP is as for
4636 grok_reference_init. */
4639 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4642 tree aggr_init, array, arrtype;
4643 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4644 if (error_operand_p (init))
4645 return error_mark_node;
4647 aggr_init = TARGET_EXPR_INITIAL (init);
4648 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4649 arrtype = TREE_TYPE (array);
4651 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4652 array = TREE_OPERAND (array, 0);
4653 /* If the array is constant, finish_compound_literal already made it a
4654 static variable and we don't need to do anything here. */
4655 if (decl && TREE_CODE (array) == TARGET_EXPR)
4657 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4658 var = build_address (var);
4659 var = convert (arrtype, var);
4660 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4665 /* Designated initializers in arrays are not supported in GNU C++.
4666 The parser cannot detect this error since it does not know whether
4667 a given brace-enclosed initializer is for a class type or for an
4668 array. This function checks that CE does not use a designated
4669 initializer. If it does, an error is issued. Returns true if CE
4670 is valid, i.e., does not have a designated initializer. */
4673 check_array_designated_initializer (const constructor_elt *ce,
4674 unsigned HOST_WIDE_INT index)
4676 /* Designated initializers for array elements are not supported. */
4679 /* The parser only allows identifiers as designated
4681 if (ce->index == error_mark_node)
4682 error ("name used in a GNU-style designated "
4683 "initializer for an array");
4684 else if (TREE_CODE (ce->index) == INTEGER_CST)
4686 /* A C99 designator is OK if it matches the current index. */
4687 if (TREE_INT_CST_LOW (ce->index) == index)
4690 sorry ("non-trivial designated initializers not supported");
4694 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4695 error ("name %qD used in a GNU-style designated "
4696 "initializer for an array", ce->index);
4704 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4705 array until we finish parsing the initializer. If that's the
4706 situation we're in, update DECL accordingly. */
4709 maybe_deduce_size_from_array_init (tree decl, tree init)
4711 tree type = TREE_TYPE (decl);
4713 if (TREE_CODE (type) == ARRAY_TYPE
4714 && TYPE_DOMAIN (type) == NULL_TREE
4715 && TREE_CODE (decl) != TYPE_DECL)
4717 /* do_default is really a C-ism to deal with tentative definitions.
4718 But let's leave it here to ease the eventual merge. */
4719 int do_default = !DECL_EXTERNAL (decl);
4720 tree initializer = init ? init : DECL_INITIAL (decl);
4723 /* Check that there are no designated initializers in INIT, as
4724 those are not supported in GNU C++, and as the middle-end
4725 will crash if presented with a non-numeric designated
4727 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4729 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4730 constructor_elt *ce;
4732 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4733 if (!check_array_designated_initializer (ce, i))
4739 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4743 error ("initializer fails to determine size of %qD", decl);
4744 TREE_TYPE (decl) = error_mark_node;
4746 else if (failure == 2)
4750 error ("array size missing in %qD", decl);
4751 TREE_TYPE (decl) = error_mark_node;
4753 /* If a `static' var's size isn't known, make it extern as
4754 well as static, so it does not get allocated. If it's not
4755 `static', then don't mark it extern; finish_incomplete_decl
4756 will give it a default size and it will get allocated. */
4757 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4758 DECL_EXTERNAL (decl) = 1;
4760 else if (failure == 3)
4762 error ("zero-size array %qD", decl);
4763 TREE_TYPE (decl) = error_mark_node;
4767 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4769 relayout_decl (decl);
4773 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4774 any appropriate error messages regarding the layout. */
4777 layout_var_decl (tree decl)
4781 type = TREE_TYPE (decl);
4782 if (type == error_mark_node)
4785 /* If we haven't already layed out this declaration, do so now.
4786 Note that we must not call complete type for an external object
4787 because it's type might involve templates that we are not
4788 supposed to instantiate yet. (And it's perfectly valid to say
4789 `extern X x' for some incomplete type `X'.) */
4790 if (!DECL_EXTERNAL (decl))
4791 complete_type (type);
4792 if (!DECL_SIZE (decl)
4793 && TREE_TYPE (decl) != error_mark_node
4794 && (COMPLETE_TYPE_P (type)
4795 || (TREE_CODE (type) == ARRAY_TYPE
4796 && !TYPE_DOMAIN (type)
4797 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4798 layout_decl (decl, 0);
4800 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4802 /* An automatic variable with an incomplete type: that is an error.
4803 Don't talk about array types here, since we took care of that
4804 message in grokdeclarator. */
4805 error ("storage size of %qD isn%'t known", decl);
4806 TREE_TYPE (decl) = error_mark_node;
4809 /* Keep this code around in case we later want to control debug info
4810 based on whether a type is "used". (jason 1999-11-11) */
4812 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4813 /* Let debugger know it should output info for this type. */
4814 note_debug_info_needed (ttype);
4816 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4817 note_debug_info_needed (DECL_CONTEXT (decl));
4820 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4821 && DECL_SIZE (decl) != NULL_TREE
4822 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4824 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4825 constant_expression_warning (DECL_SIZE (decl));
4828 error ("storage size of %qD isn%'t constant", decl);
4829 TREE_TYPE (decl) = error_mark_node;
4834 /* If a local static variable is declared in an inline function, or if
4835 we have a weak definition, we must endeavor to create only one
4836 instance of the variable at link-time. */
4839 maybe_commonize_var (tree decl)
4841 /* Static data in a function with comdat linkage also has comdat
4843 if (TREE_STATIC (decl)
4844 /* Don't mess with __FUNCTION__. */
4845 && ! DECL_ARTIFICIAL (decl)
4846 && DECL_FUNCTION_SCOPE_P (decl)
4847 && vague_linkage_p (DECL_CONTEXT (decl)))
4851 /* With weak symbols, we simply make the variable COMDAT;
4852 that will cause copies in multiple translations units to
4854 comdat_linkage (decl);
4858 if (DECL_INITIAL (decl) == NULL_TREE
4859 || DECL_INITIAL (decl) == error_mark_node)
4861 /* Without weak symbols, we can use COMMON to merge
4862 uninitialized variables. */
4863 TREE_PUBLIC (decl) = 1;
4864 DECL_COMMON (decl) = 1;
4868 /* While for initialized variables, we must use internal
4869 linkage -- which means that multiple copies will not
4871 TREE_PUBLIC (decl) = 0;
4872 DECL_COMMON (decl) = 0;
4873 warning_at (input_location, 0,
4874 "sorry: semantics of inline function static "
4875 "data %q+#D are wrong (you%'ll wind up "
4876 "with multiple copies)", decl);
4877 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4878 " you can work around this by removing "
4883 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4884 /* Set it up again; we might have set DECL_INITIAL since the last
4886 comdat_linkage (decl);
4889 /* Issue an error message if DECL is an uninitialized const variable. */
4892 check_for_uninitialized_const_var (tree decl)
4894 tree type = strip_array_types (TREE_TYPE (decl));
4896 /* ``Unless explicitly declared extern, a const object does not have
4897 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4899 if (TREE_CODE (decl) == VAR_DECL
4900 && TREE_CODE (type) != REFERENCE_TYPE
4901 && CP_TYPE_CONST_P (type)
4902 && (!TYPE_NEEDS_CONSTRUCTING (type)
4903 || !type_has_user_provided_default_constructor (type))
4904 && !DECL_INITIAL (decl))
4906 permerror (DECL_SOURCE_LOCATION (decl),
4907 "uninitialized const %qD", decl);
4909 if (CLASS_TYPE_P (type)
4910 && !type_has_user_provided_default_constructor (type))
4912 tree defaulted_ctor;
4914 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4915 "%q#T has no user-provided default constructor", type);
4916 defaulted_ctor = in_class_defaulted_default_constructor (type);
4918 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4919 "constructor is not user-provided because it is "
4920 "explicitly defaulted in the class body");
4925 /* Structure holding the current initializer being processed by reshape_init.
4926 CUR is a pointer to the current element being processed, END is a pointer
4927 after the last element present in the initializer. */
4928 typedef struct reshape_iterator_t
4930 constructor_elt *cur;
4931 constructor_elt *end;
4934 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4936 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4937 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4938 initialized. If there are no more such fields, the return value
4942 next_initializable_field (tree field)
4945 && (TREE_CODE (field) != FIELD_DECL
4946 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4947 || DECL_ARTIFICIAL (field)))
4948 field = DECL_CHAIN (field);
4953 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4954 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4955 INTEGER_CST representing the size of the array minus one (the maximum index),
4956 or NULL_TREE if the array was declared without specifying the size. D is
4957 the iterator within the constructor. */
4960 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4961 tsubst_flags_t complain)
4964 bool sized_array_p = (max_index != NULL_TREE);
4965 unsigned HOST_WIDE_INT max_index_cst = 0;
4966 unsigned HOST_WIDE_INT index;
4968 /* The initializer for an array is always a CONSTRUCTOR. */
4969 new_init = build_constructor (init_list_type_node, NULL);
4973 /* Minus 1 is used for zero sized arrays. */
4974 if (integer_all_onesp (max_index))
4977 if (host_integerp (max_index, 1))
4978 max_index_cst = tree_low_cst (max_index, 1);
4979 /* sizetype is sign extended, not zero extended. */
4981 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4985 /* Loop until there are no more initializers. */
4987 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4992 check_array_designated_initializer (d->cur, index);
4993 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4995 if (elt_init == error_mark_node)
4996 return error_mark_node;
4997 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4998 size_int (index), elt_init);
4999 if (!TREE_CONSTANT (elt_init))
5000 TREE_CONSTANT (new_init) = false;
5006 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5007 Parameters are the same of reshape_init_r. */
5010 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5012 tree max_index = NULL_TREE;
5014 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5016 if (TYPE_DOMAIN (type))
5017 max_index = array_type_nelts (type);
5019 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5022 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5023 Parameters are the same of reshape_init_r. */
5026 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5028 tree max_index = NULL_TREE;
5030 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5032 if (COMPOUND_LITERAL_P (d->cur->value))
5034 tree value = d->cur->value;
5035 if (!same_type_p (TREE_TYPE (value), type))
5037 if (complain & tf_error)
5038 error ("invalid type %qT as initializer for a vector of type %qT",
5039 TREE_TYPE (d->cur->value), type);
5040 value = error_mark_node;
5046 /* For a vector, we initialize it as an array of the appropriate size. */
5047 if (TREE_CODE (type) == VECTOR_TYPE)
5048 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5050 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5053 /* Subroutine of reshape_init_r, processes the initializers for classes
5054 or union. Parameters are the same of reshape_init_r. */
5057 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5058 tsubst_flags_t complain)
5063 gcc_assert (CLASS_TYPE_P (type));
5065 /* The initializer for a class is always a CONSTRUCTOR. */
5066 new_init = build_constructor (init_list_type_node, NULL);
5067 field = next_initializable_field (TYPE_FIELDS (type));
5073 An initializer for an aggregate member that is an
5074 empty class shall have the form of an empty
5075 initializer-list {}. */
5076 if (!first_initializer_p)
5078 if (complain & tf_error)
5079 error ("initializer for %qT must be brace-enclosed", type);
5080 return error_mark_node;
5085 /* Loop through the initializable fields, gathering initializers. */
5086 while (d->cur != d->end)
5090 /* Handle designated initializers, as an extension. */
5093 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5095 if (!field || TREE_CODE (field) != FIELD_DECL)
5097 if (complain & tf_error)
5098 error ("%qT has no non-static data member named %qD", type,
5100 return error_mark_node;
5104 /* If we processed all the member of the class, we are done. */
5108 field_init = reshape_init_r (TREE_TYPE (field), d,
5109 /*first_initializer_p=*/false, complain);
5110 if (field_init == error_mark_node)
5111 return error_mark_node;
5113 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5117 When a union is initialized with a brace-enclosed
5118 initializer, the braces shall only contain an
5119 initializer for the first member of the union. */
5120 if (TREE_CODE (type) == UNION_TYPE)
5123 field = next_initializable_field (DECL_CHAIN (field));
5129 /* Subroutine of reshape_init, which processes a single initializer (part of
5130 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5131 iterator within the CONSTRUCTOR which points to the initializer to process.
5132 FIRST_INITIALIZER_P is true if this is the first initializer of the
5133 outermost CONSTRUCTOR node. */
5136 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5137 tsubst_flags_t complain)
5139 tree init = d->cur->value;
5141 if (error_operand_p (init))
5142 return error_mark_node;
5144 if (TREE_CODE (type) == COMPLEX_TYPE)
5146 /* A complex type can be initialized from one or two initializers,
5147 but braces are not elided. */
5149 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5151 if (CONSTRUCTOR_NELTS (init) > 2)
5153 if (complain & tf_error)
5154 error ("too many initializers for %qT", type);
5156 return error_mark_node;
5159 else if (first_initializer_p && d->cur != d->end)
5161 VEC(constructor_elt, gc) *v = 0;
5162 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5163 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5165 init = build_constructor (init_list_type_node, v);
5170 /* A non-aggregate type is always initialized with a single
5172 if (!CP_AGGREGATE_TYPE_P (type))
5174 /* It is invalid to initialize a non-aggregate type with a
5175 brace-enclosed initializer before C++0x.
5176 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5177 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5178 a CONSTRUCTOR (with a record type). */
5179 if (TREE_CODE (init) == CONSTRUCTOR
5180 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5182 if (SCALAR_TYPE_P (type))
5184 if (complain & tf_error)
5185 error ("braces around scalar initializer for type %qT", type);
5186 init = error_mark_node;
5189 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5198 All implicit type conversions (clause _conv_) are considered when
5199 initializing the aggregate member with an initializer from an
5200 initializer-list. If the initializer can initialize a member,
5201 the member is initialized. Otherwise, if the member is itself a
5202 non-empty subaggregate, brace elision is assumed and the
5203 initializer is considered for the initialization of the first
5204 member of the subaggregate. */
5205 if (TREE_CODE (init) != CONSTRUCTOR
5206 /* But don't try this for the first initializer, since that would be
5207 looking through the outermost braces; A a2 = { a1 }; is not a
5208 valid aggregate initialization. */
5209 && !first_initializer_p
5210 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5211 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5217 /* [dcl.init.string]
5219 A char array (whether plain char, signed char, or unsigned char)
5220 can be initialized by a string-literal (optionally enclosed in
5221 braces); a wchar_t array can be initialized by a wide
5222 string-literal (optionally enclosed in braces). */
5223 if (TREE_CODE (type) == ARRAY_TYPE
5224 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5226 tree str_init = init;
5228 /* Strip one level of braces if and only if they enclose a single
5229 element (as allowed by [dcl.init.string]). */
5230 if (!first_initializer_p
5231 && TREE_CODE (str_init) == CONSTRUCTOR
5232 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5234 str_init = VEC_index (constructor_elt,
5235 CONSTRUCTOR_ELTS (str_init), 0)->value;
5238 /* If it's a string literal, then it's the initializer for the array
5239 as a whole. Otherwise, continue with normal initialization for
5240 array types (one value per array element). */
5241 if (TREE_CODE (str_init) == STRING_CST)
5248 /* The following cases are about aggregates. If we are not within a full
5249 initializer already, and there is not a CONSTRUCTOR, it means that there
5250 is a missing set of braces (that is, we are processing the case for
5251 which reshape_init exists). */
5252 if (!first_initializer_p)
5254 if (TREE_CODE (init) == CONSTRUCTOR)
5256 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5257 /* There is no need to reshape pointer-to-member function
5258 initializers, as they are always constructed correctly
5259 by the front end. */
5261 else if (COMPOUND_LITERAL_P (init))
5262 /* For a nested compound literal, there is no need to reshape since
5263 brace elision is not allowed. Even if we decided to allow it,
5264 we should add a call to reshape_init in finish_compound_literal,
5265 before calling digest_init, so changing this code would still
5266 not be necessary. */
5267 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5271 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5272 return reshape_init (type, init, complain);
5276 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5280 /* Dispatch to specialized routines. */
5281 if (CLASS_TYPE_P (type))
5282 return reshape_init_class (type, d, first_initializer_p, complain);
5283 else if (TREE_CODE (type) == ARRAY_TYPE)
5284 return reshape_init_array (type, d, complain);
5285 else if (TREE_CODE (type) == VECTOR_TYPE)
5286 return reshape_init_vector (type, d, complain);
5291 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5292 brace-enclosed aggregate initializer.
5294 INIT is the CONSTRUCTOR containing the list of initializers describing
5295 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5296 It may not presently match the shape of the TYPE; for example:
5298 struct S { int a; int b; };
5299 struct S a[] = { 1, 2, 3, 4 };
5301 Here INIT will hold a VEC of four elements, rather than a
5302 VEC of two elements, each itself a VEC of two elements. This
5303 routine transforms INIT from the former form into the latter. The
5304 revised CONSTRUCTOR node is returned. */
5307 reshape_init (tree type, tree init, tsubst_flags_t complain)
5309 VEC(constructor_elt, gc) *v;
5313 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5315 v = CONSTRUCTOR_ELTS (init);
5317 /* An empty constructor does not need reshaping, and it is always a valid
5319 if (VEC_empty (constructor_elt, v))
5322 /* Recurse on this CONSTRUCTOR. */
5323 d.cur = VEC_index (constructor_elt, v, 0);
5324 d.end = d.cur + VEC_length (constructor_elt, v);
5326 new_init = reshape_init_r (type, &d, true, complain);
5327 if (new_init == error_mark_node)
5328 return error_mark_node;
5330 /* Make sure all the element of the constructor were used. Otherwise,
5331 issue an error about exceeding initializers. */
5334 if (complain & tf_error)
5335 error ("too many initializers for %qT", type);
5337 return error_mark_node;
5343 /* Verify array initializer. Returns true if errors have been reported. */
5346 check_array_initializer (tree decl, tree type, tree init)
5348 tree element_type = TREE_TYPE (type);
5350 /* The array type itself need not be complete, because the
5351 initializer may tell us how many elements are in the array.
5352 But, the elements of the array must be complete. */
5353 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5356 error ("elements of array %q#D have incomplete type", decl);
5358 error ("elements of array %q#T have incomplete type", type);
5361 /* It is not valid to initialize a VLA. */
5363 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5364 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5367 error ("variable-sized object %qD may not be initialized", decl);
5369 error ("variable-sized compound literal");
5375 /* Subroutine of check_initializer; args are passed down from that function.
5376 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5379 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5382 int saved_stmts_are_full_exprs_p = 0;
5383 if (building_stmt_list_p ())
5385 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5386 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5388 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5389 if (building_stmt_list_p ())
5390 current_stmt_tree ()->stmts_are_full_exprs_p =
5391 saved_stmts_are_full_exprs_p;
5395 /* Verify INIT (the initializer for DECL), and record the
5396 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5397 grok_reference_init.
5399 If the return value is non-NULL, it is an expression that must be
5400 evaluated dynamically to initialize DECL. */
5403 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5405 tree type = TREE_TYPE (decl);
5406 tree init_code = NULL;
5407 tree extra_init = NULL_TREE;
5410 /* Things that are going to be initialized need to have complete
5412 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5414 if (DECL_HAS_VALUE_EXPR_P (decl))
5416 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5417 it doesn't have storage to be initialized. */
5418 gcc_assert (init == NULL_TREE);
5422 if (type == error_mark_node)
5423 /* We will have already complained. */
5426 if (TREE_CODE (type) == ARRAY_TYPE)
5428 if (check_array_initializer (decl, type, init))
5431 else if (!COMPLETE_TYPE_P (type))
5433 error ("%qD has incomplete type", decl);
5434 TREE_TYPE (decl) = error_mark_node;
5438 /* There is no way to make a variable-sized class type in GNU C++. */
5439 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5441 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5443 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5444 if (SCALAR_TYPE_P (type))
5448 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5449 init = build_zero_init (type, NULL_TREE, false);
5451 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5453 error ("scalar object %qD requires one element in initializer",
5455 TREE_TYPE (decl) = error_mark_node;
5461 if (TREE_CODE (decl) == CONST_DECL)
5463 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5465 DECL_INITIAL (decl) = init;
5467 gcc_assert (init != NULL_TREE);
5470 else if (!init && DECL_REALLY_EXTERN (decl))
5472 else if (TREE_CODE (type) == REFERENCE_TYPE)
5473 init = grok_reference_init (decl, type, init, cleanup, flags);
5474 else if (init || type_build_ctor_call (type))
5477 check_for_uninitialized_const_var (decl);
5478 /* Do not reshape constructors of vectors (they don't need to be
5480 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5482 if (is_std_init_list (type))
5483 init = build_init_list_var_init (decl, type, init,
5484 &extra_init, cleanup);
5485 else if (TYPE_NON_AGGREGATE_CLASS (type))
5487 /* Don't reshape if the class has constructors. */
5488 if (cxx_dialect == cxx98)
5489 error ("in C++98 %qD must be initialized by constructor, "
5493 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5495 error ("opaque vector types cannot be initialized");
5496 init = error_mark_node;
5500 init = reshape_init (type, init, tf_warning_or_error);
5501 if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
5502 check_narrowing (type, init);
5506 /* If DECL has an array type without a specific bound, deduce the
5507 array size from the initializer. */
5508 maybe_deduce_size_from_array_init (decl, init);
5509 type = TREE_TYPE (decl);
5510 if (type == error_mark_node)
5513 if (type_build_ctor_call (type)
5514 || (CLASS_TYPE_P (type)
5515 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5517 init_code = build_aggr_init_full_exprs (decl, init, flags);
5519 /* If this is a constexpr initializer, expand_default_init will
5520 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5521 case, pull the initializer back out and pass it down into
5522 store_init_value. */
5523 while (TREE_CODE (init_code) == EXPR_STMT
5524 || TREE_CODE (init_code) == CONVERT_EXPR)
5525 init_code = TREE_OPERAND (init_code, 0);
5526 if (TREE_CODE (init_code) == INIT_EXPR)
5528 init = TREE_OPERAND (init_code, 1);
5529 init_code = NULL_TREE;
5530 /* Don't call digest_init; it's unnecessary and will complain
5531 about aggregate initialization of non-aggregate classes. */
5532 flags |= LOOKUP_ALREADY_DIGESTED;
5534 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5536 /* Declared constexpr, but no suitable initializer; massage
5537 init appropriately so we can pass it into store_init_value
5539 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5540 init = finish_compound_literal (type, init,
5541 tf_warning_or_error);
5542 else if (CLASS_TYPE_P (type)
5543 && (!init || TREE_CODE (init) == TREE_LIST))
5545 init = build_functional_cast (type, init, tf_none);
5546 if (init != error_mark_node)
5547 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5549 init_code = NULL_TREE;
5555 if (init && TREE_CODE (init) != TREE_VEC)
5557 init_code = store_init_value (decl, init, flags);
5558 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5559 && DECL_INITIAL (decl)
5560 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5561 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5562 warning (0, "array %qD initialized by parenthesized string literal %qE",
5563 decl, DECL_INITIAL (decl));
5569 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5570 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5571 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5572 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5575 check_for_uninitialized_const_var (decl);
5578 if (init && init != error_mark_node)
5579 init_code = build2 (INIT_EXPR, type, decl, init);
5582 init_code = add_stmt_to_compound (extra_init, init_code);
5584 if (init_code && DECL_IN_AGGR_P (decl))
5586 static int explained = 0;
5588 if (cxx_dialect < cxx0x)
5589 error ("initializer invalid for static member with constructor");
5591 error ("non-constant in-class initialization invalid for static "
5592 "member %qD", decl);
5595 error ("(an out of class initialization is required)");
5603 /* If DECL is not a local variable, give it RTL. */
5606 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5608 int toplev = toplevel_bindings_p ();
5610 const char *filename;
5612 /* Set the DECL_ASSEMBLER_NAME for the object. */
5615 /* The `register' keyword, when used together with an
5616 asm-specification, indicates that the variable should be
5617 placed in a particular register. */
5618 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5620 set_user_assembler_name (decl, asmspec);
5621 DECL_HARD_REGISTER (decl) = 1;
5625 if (TREE_CODE (decl) == FUNCTION_DECL
5626 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5627 set_builtin_user_assembler_name (decl, asmspec);
5628 set_user_assembler_name (decl, asmspec);
5632 /* Handle non-variables up front. */
5633 if (TREE_CODE (decl) != VAR_DECL)
5635 rest_of_decl_compilation (decl, toplev, at_eof);
5639 /* If we see a class member here, it should be a static data
5641 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5643 gcc_assert (TREE_STATIC (decl));
5644 /* An in-class declaration of a static data member should be
5645 external; it is only a declaration, and not a definition. */
5646 if (init == NULL_TREE)
5647 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5650 /* We don't create any RTL for local variables. */
5651 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5654 /* We defer emission of local statics until the corresponding
5655 DECL_EXPR is expanded. */
5656 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5658 /* We try to defer namespace-scope static constants so that they are
5659 not emitted into the object file unnecessarily. */
5660 filename = input_filename;
5661 if (!DECL_VIRTUAL_P (decl)
5662 && TREE_READONLY (decl)
5663 && DECL_INITIAL (decl) != NULL_TREE
5664 && DECL_INITIAL (decl) != error_mark_node
5666 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5668 && !TREE_PUBLIC (decl))
5670 /* Fool with the linkage of static consts according to #pragma
5672 struct c_fileinfo *finfo = get_fileinfo (filename);
5673 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5675 TREE_PUBLIC (decl) = 1;
5676 DECL_EXTERNAL (decl) = finfo->interface_only;
5681 /* Likewise for template instantiations. */
5682 else if (DECL_LANG_SPECIFIC (decl)
5683 && DECL_IMPLICIT_INSTANTIATION (decl))
5686 /* If we're not deferring, go ahead and assemble the variable. */
5688 rest_of_decl_compilation (decl, toplev, at_eof);
5691 /* walk_tree helper for wrap_temporary_cleanups, below. */
5694 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5696 if (TYPE_P (*stmt_p))
5702 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5704 tree guard = (tree)data;
5705 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5707 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5708 /* Tell honor_protect_cleanup_actions to handle this as a separate
5710 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5712 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5718 /* We're initializing a local variable which has a cleanup GUARD. If there
5719 are any temporaries used in the initializer INIT of this variable, we
5720 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5721 variable will be cleaned up properly if one of them throws.
5723 Unfortunately, there's no way to express this properly in terms of
5724 nesting, as the regions for the temporaries overlap the region for the
5725 variable itself; if there are two temporaries, the variable needs to be
5726 the first thing destroyed if either of them throws. However, we only
5727 want to run the variable's cleanup if it actually got constructed. So
5728 we need to guard the temporary cleanups with the variable's cleanup if
5729 they are run on the normal path, but not if they are run on the
5730 exceptional path. We implement this by telling
5731 honor_protect_cleanup_actions to strip the variable cleanup from the
5732 exceptional path. */
5735 wrap_temporary_cleanups (tree init, tree guard)
5737 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5740 /* Generate code to initialize DECL (a local variable). */
5743 initialize_local_var (tree decl, tree init)
5745 tree type = TREE_TYPE (decl);
5749 gcc_assert (TREE_CODE (decl) == VAR_DECL
5750 || TREE_CODE (decl) == RESULT_DECL);
5751 gcc_assert (!TREE_STATIC (decl));
5753 if (DECL_SIZE (decl) == NULL_TREE)
5755 /* If we used it already as memory, it must stay in memory. */
5756 DECL_INITIAL (decl) = NULL_TREE;
5757 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5761 if (type == error_mark_node)
5764 /* Compute and store the initial value. */
5765 already_used = TREE_USED (decl) || TREE_USED (type);
5766 if (TREE_USED (type))
5767 DECL_READ_P (decl) = 1;
5769 /* Generate a cleanup, if necessary. */
5770 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5772 /* Perform the initialization. */
5775 if (TREE_CODE (init) == INIT_EXPR
5776 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5778 /* Stick simple initializers in DECL_INITIAL so that
5779 -Wno-init-self works (c++/34772). */
5780 gcc_assert (TREE_OPERAND (init, 0) == decl);
5781 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5785 int saved_stmts_are_full_exprs_p;
5787 /* If we're only initializing a single object, guard the
5788 destructors of any temporaries used in its initializer with
5789 its destructor. This isn't right for arrays because each
5790 element initialization is a full-expression. */
5791 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5792 wrap_temporary_cleanups (init, cleanup);
5794 gcc_assert (building_stmt_list_p ());
5795 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5796 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5797 finish_expr_stmt (init);
5798 current_stmt_tree ()->stmts_are_full_exprs_p =
5799 saved_stmts_are_full_exprs_p;
5803 /* Set this to 0 so we can tell whether an aggregate which was
5804 initialized was ever used. Don't do this if it has a
5805 destructor, so we don't complain about the 'resource
5806 allocation is initialization' idiom. Now set
5807 attribute((unused)) on types so decls of that type will be
5808 marked used. (see TREE_USED, above.) */
5809 if (TYPE_NEEDS_CONSTRUCTING (type)
5811 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5812 && DECL_NAME (decl))
5813 TREE_USED (decl) = 0;
5814 else if (already_used)
5815 TREE_USED (decl) = 1;
5818 finish_decl_cleanup (decl, cleanup);
5821 /* DECL is a VAR_DECL for a compiler-generated variable with static
5822 storage duration (like a virtual table) whose initializer is a
5823 compile-time constant. Initialize the variable and provide it to the
5827 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5830 gcc_assert (DECL_ARTIFICIAL (decl));
5831 init = build_constructor (TREE_TYPE (decl), v);
5832 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5833 DECL_INITIAL (decl) = init;
5834 DECL_INITIALIZED_P (decl) = 1;
5835 determine_visibility (decl);
5836 layout_var_decl (decl);
5837 maybe_commonize_var (decl);
5838 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5841 /* INIT is the initializer for a variable, as represented by the
5842 parser. Returns true iff INIT is type-dependent. */
5845 type_dependent_init_p (tree init)
5847 if (TREE_CODE (init) == TREE_LIST)
5848 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5849 return any_type_dependent_elements_p (init);
5850 else if (TREE_CODE (init) == CONSTRUCTOR)
5851 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5853 VEC(constructor_elt, gc) *elts;
5857 elts = CONSTRUCTOR_ELTS (init);
5858 nelts = VEC_length (constructor_elt, elts);
5859 for (i = 0; i < nelts; ++i)
5860 if (type_dependent_init_p (VEC_index (constructor_elt,
5865 /* It must be a simple expression, e.g., int i = 3; */
5866 return type_dependent_expression_p (init);
5871 /* INIT is the initializer for a variable, as represented by the
5872 parser. Returns true iff INIT is value-dependent. */
5875 value_dependent_init_p (tree init)
5877 if (TREE_CODE (init) == TREE_LIST)
5878 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5879 return any_value_dependent_elements_p (init);
5880 else if (TREE_CODE (init) == CONSTRUCTOR)
5881 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5883 VEC(constructor_elt, gc) *elts;
5887 elts = CONSTRUCTOR_ELTS (init);
5888 nelts = VEC_length (constructor_elt, elts);
5889 for (i = 0; i < nelts; ++i)
5890 if (value_dependent_init_p (VEC_index (constructor_elt,
5895 /* It must be a simple expression, e.g., int i = 3; */
5896 return value_dependent_expression_p (init);
5901 /* Finish processing of a declaration;
5902 install its line number and initial value.
5903 If the length of an array type is not known before,
5904 it must be determined now, from the initial value, or it is an error.
5906 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5907 true, then INIT is an integral constant expression.
5909 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5910 if the (init) syntax was used. */
5913 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5914 tree asmspec_tree, int flags)
5918 const char *asmspec = NULL;
5919 int was_readonly = 0;
5920 bool var_definition_p = false;
5923 if (decl == error_mark_node)
5928 error ("assignment (not initialization) in declaration");
5932 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5933 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5934 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5936 type = TREE_TYPE (decl);
5937 if (type == error_mark_node)
5940 /* Assume no cleanup is required. */
5941 cleanup = NULL_TREE;
5943 /* If a name was specified, get the string. */
5944 if (at_namespace_scope_p ())
5945 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5946 if (asmspec_tree && asmspec_tree != error_mark_node)
5947 asmspec = TREE_STRING_POINTER (asmspec_tree);
5949 if (current_class_type
5950 && CP_DECL_CONTEXT (decl) == current_class_type
5951 && TYPE_BEING_DEFINED (current_class_type)
5952 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5953 && (DECL_INITIAL (decl) || init))
5954 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5956 auto_node = type_uses_auto (type);
5960 if (init == NULL_TREE)
5962 error ("declaration of %q#D has no initializer", decl);
5963 TREE_TYPE (decl) = error_mark_node;
5967 if (TREE_CODE (d_init) == TREE_LIST)
5968 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5969 tf_warning_or_error);
5970 d_init = resolve_nondeduced_context (d_init);
5971 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5973 if (type == error_mark_node)
5977 if (!ensure_literal_type_for_constexpr_object (decl))
5978 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5980 if (TREE_CODE (decl) == VAR_DECL
5981 && DECL_CLASS_SCOPE_P (decl)
5982 && DECL_INITIALIZED_IN_CLASS_P (decl))
5983 check_static_variable_definition (decl, type);
5985 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5988 if (init == ridpointers[(int)RID_DELETE])
5990 /* FIXME check this is 1st decl. */
5991 DECL_DELETED_FN (decl) = 1;
5992 DECL_DECLARED_INLINE_P (decl) = 1;
5993 DECL_INITIAL (decl) = error_mark_node;
5994 FOR_EACH_CLONE (clone, decl)
5996 DECL_DELETED_FN (clone) = 1;
5997 DECL_DECLARED_INLINE_P (clone) = 1;
5998 DECL_INITIAL (clone) = error_mark_node;
6002 else if (init == ridpointers[(int)RID_DEFAULT])
6004 if (defaultable_fn_check (decl))
6005 DECL_DEFAULTED_FN (decl) = 1;
6007 DECL_INITIAL (decl) = NULL_TREE;
6011 if (init && TREE_CODE (decl) == VAR_DECL)
6013 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6014 /* If DECL is a reference, then we want to know whether init is a
6015 reference constant; init_const_expr_p as passed tells us whether
6016 it's an rvalue constant. */
6017 if (TREE_CODE (type) == REFERENCE_TYPE)
6018 init_const_expr_p = potential_constant_expression (init);
6019 if (init_const_expr_p)
6021 /* Set these flags now for templates. We'll update the flags in
6022 store_init_value for instantiations. */
6023 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6024 if (decl_maybe_constant_var_p (decl))
6025 TREE_CONSTANT (decl) = 1;
6029 if (processing_template_decl)
6031 bool type_dependent_p;
6033 /* Add this declaration to the statement-tree. */
6034 if (at_function_scope_p ())
6035 add_decl_expr (decl);
6037 type_dependent_p = dependent_type_p (type);
6039 if (check_for_bare_parameter_packs (init))
6042 DECL_INITIAL (decl) = NULL_TREE;
6045 /* Generally, initializers in templates are expanded when the
6046 template is instantiated. But, if DECL is a variable constant
6047 then it can be used in future constant expressions, so its value
6048 must be available. */
6050 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6051 /* We can't do anything if the decl has dependent type. */;
6053 && init_const_expr_p
6054 && !type_dependent_p
6055 && decl_maybe_constant_var_p (decl)
6056 && !type_dependent_init_p (init)
6057 && !value_dependent_init_p (init))
6059 /* This variable seems to be a non-dependent constant, so process
6060 its initializer. If check_initializer returns non-null the
6061 initialization wasn't constant after all. */
6062 tree init_code = check_initializer (decl, init, flags, &cleanup);
6063 if (init_code == NULL_TREE)
6066 else if (!DECL_PRETTY_FUNCTION_P (decl))
6067 /* Deduce array size even if the initializer is dependent. */
6068 maybe_deduce_size_from_array_init (decl, init);
6071 DECL_INITIAL (decl) = init;
6075 /* Take care of TYPE_DECLs up front. */
6076 if (TREE_CODE (decl) == TYPE_DECL)
6078 if (type != error_mark_node
6079 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6081 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6082 warning (0, "shadowing previous type declaration of %q#D", decl);
6083 set_identifier_type_value (DECL_NAME (decl), decl);
6086 /* If we have installed this as the canonical typedef for this
6087 type, and that type has not been defined yet, delay emitting
6088 the debug information for it, as we will emit it later. */
6089 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6090 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6091 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6093 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6098 /* A reference will be modified here, as it is initialized. */
6099 if (! DECL_EXTERNAL (decl)
6100 && TREE_READONLY (decl)
6101 && TREE_CODE (type) == REFERENCE_TYPE)
6104 TREE_READONLY (decl) = 0;
6107 if (TREE_CODE (decl) == VAR_DECL)
6109 /* Only variables with trivial initialization and destruction can
6110 have thread-local storage. */
6111 if (DECL_THREAD_LOCAL_P (decl)
6112 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6113 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6114 error ("%qD cannot be thread-local because it has non-trivial "
6115 "type %qT", decl, TREE_TYPE (decl));
6116 /* If this is a local variable that will need a mangled name,
6117 register it now. We must do this before processing the
6118 initializer for the variable, since the initialization might
6119 require a guard variable, and since the mangled name of the
6120 guard variable will depend on the mangled name of this
6122 if (DECL_FUNCTION_SCOPE_P (decl)
6123 && TREE_STATIC (decl)
6124 && !DECL_ARTIFICIAL (decl))
6126 push_local_name (decl);
6127 if (DECL_CONSTRUCTOR_P (current_function_decl)
6128 || DECL_DESTRUCTOR_P (current_function_decl))
6129 /* Normally local_decls is populated during GIMPLE lowering,
6130 but [cd]tors are never actually compiled directly. We need
6131 to put statics on the list so we can deal with the label
6132 address extension. */
6133 add_local_decl (cfun, decl);
6136 /* Convert the initializer to the type of DECL, if we have not
6137 already initialized DECL. */
6138 if (!DECL_INITIALIZED_P (decl)
6139 /* If !DECL_EXTERNAL then DECL is being defined. In the
6140 case of a static data member initialized inside the
6141 class-specifier, there can be an initializer even if DECL
6142 is *not* defined. */
6143 && (!DECL_EXTERNAL (decl) || init))
6145 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6148 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6149 /* Allow libjava/prims.cc define primitive classes. */
6150 if (init != NULL_TREE
6151 || jclass == NULL_TREE
6152 || TREE_CODE (jclass) != TYPE_DECL
6153 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6154 || !same_type_ignoring_top_level_qualifiers_p
6155 (type, TREE_TYPE (TREE_TYPE (jclass))))
6156 error ("Java object %qD not allocated with %<new%>", decl);
6159 init = check_initializer (decl, init, flags, &cleanup);
6160 /* Thread-local storage cannot be dynamically initialized. */
6161 if (DECL_THREAD_LOCAL_P (decl) && init)
6163 error ("%qD is thread-local and so cannot be dynamically "
6164 "initialized", decl);
6168 /* Check that the initializer for a static data member was a
6169 constant. Although we check in the parser that the
6170 initializer is an integral constant expression, we do not
6171 simplify division-by-zero at the point at which it
6172 occurs. Therefore, in:
6174 struct S { static const int i = 7 / 0; };
6176 we issue an error at this point. It would
6177 probably be better to forbid division by zero in
6178 integral constant expressions. */
6179 if (DECL_EXTERNAL (decl) && init)
6181 error ("%qD cannot be initialized by a non-constant expression"
6182 " when being declared", decl);
6183 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6191 The memory occupied by any object of static storage
6192 duration is zero-initialized at program startup before
6193 any other initialization takes place.
6195 We cannot create an appropriate initializer until after
6196 the type of DECL is finalized. If DECL_INITIAL is set,
6197 then the DECL is statically initialized, and any
6198 necessary zero-initialization has already been performed. */
6199 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6200 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6201 /*nelts=*/NULL_TREE,
6202 /*static_storage_p=*/true);
6203 /* Remember that the initialization for this variable has
6205 DECL_INITIALIZED_P (decl) = 1;
6206 /* This declaration is the definition of this variable,
6207 unless we are initializing a static data member within
6208 the class specifier. */
6209 if (!DECL_EXTERNAL (decl))
6210 var_definition_p = true;
6212 /* If the variable has an array type, lay out the type, even if
6213 there is no initializer. It is valid to index through the
6214 array, and we must get TYPE_ALIGN set correctly on the array
6216 else if (TREE_CODE (type) == ARRAY_TYPE)
6219 if (TREE_STATIC (decl)
6220 && !at_function_scope_p ()
6221 && current_function_decl == NULL)
6222 /* So decl is a global variable or a static member of a
6223 non local class. Record the types it uses
6224 so that we can decide later to emit debug info for them. */
6225 record_types_used_by_current_var_decl (decl);
6227 else if (TREE_CODE (decl) == FIELD_DECL
6228 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6229 error ("non-static data member %qD has Java class type", decl);
6231 /* Add this declaration to the statement-tree. This needs to happen
6232 after the call to check_initializer so that the DECL_EXPR for a
6233 reference temp is added before the DECL_EXPR for the reference itself. */
6234 if (DECL_FUNCTION_SCOPE_P (decl))
6235 add_decl_expr (decl);
6237 /* Let the middle end know about variables and functions -- but not
6238 static data members in uninstantiated class templates. */
6239 if (TREE_CODE (decl) == VAR_DECL
6240 || TREE_CODE (decl) == FUNCTION_DECL)
6242 if (TREE_CODE (decl) == VAR_DECL)
6244 layout_var_decl (decl);
6245 maybe_commonize_var (decl);
6248 /* This needs to happen after the linkage is set. */
6249 determine_visibility (decl);
6251 if (var_definition_p && TREE_STATIC (decl))
6253 /* If a TREE_READONLY variable needs initialization
6254 at runtime, it is no longer readonly and we need to
6255 avoid MEM_READONLY_P being set on RTL created for it. */
6258 if (TREE_READONLY (decl))
6259 TREE_READONLY (decl) = 0;
6262 else if (was_readonly)
6263 TREE_READONLY (decl) = 1;
6266 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6268 /* Check for abstractness of the type. Notice that there is no
6269 need to strip array types here since the check for those types
6270 is already done within create_array_type_for_decl. */
6271 if (TREE_CODE (type) == FUNCTION_TYPE
6272 || TREE_CODE (type) == METHOD_TYPE)
6273 abstract_virtuals_error (decl, TREE_TYPE (type));
6275 abstract_virtuals_error (decl, type);
6277 if (TREE_TYPE (decl) == error_mark_node)
6278 /* No initialization required. */
6280 else if (TREE_CODE (decl) == FUNCTION_DECL)
6284 if (init == ridpointers[(int)RID_DEFAULT])
6286 /* An out-of-class default definition is defined at
6287 the point where it is explicitly defaulted. */
6288 if (DECL_DELETED_FN (decl))
6289 maybe_explain_implicit_delete (decl);
6290 else if (DECL_INITIAL (decl) == error_mark_node)
6291 synthesize_method (decl);
6294 error ("function %q#D is initialized like a variable", decl);
6296 /* else no initialization required. */
6298 else if (DECL_EXTERNAL (decl)
6299 && ! (DECL_LANG_SPECIFIC (decl)
6300 && DECL_NOT_REALLY_EXTERN (decl)))
6303 DECL_INITIAL (decl) = init;
6305 /* A variable definition. */
6306 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6307 /* Initialize the local variable. */
6308 initialize_local_var (decl, init);
6310 /* If a variable is defined, and then a subsequent
6311 definition with external linkage is encountered, we will
6312 get here twice for the same variable. We want to avoid
6313 calling expand_static_init more than once. For variables
6314 that are not static data members, we can call
6315 expand_static_init only when we actually process the
6316 initializer. It is not legal to redeclare a static data
6317 member, so this issue does not arise in that case. */
6318 else if (var_definition_p && TREE_STATIC (decl))
6319 expand_static_init (decl, init);
6322 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6323 reference, insert it in the statement-tree now. */
6325 push_cleanup (decl, cleanup, false);
6328 TREE_READONLY (decl) = 1;
6330 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6333 /* Returns a declaration for a VAR_DECL as if:
6335 extern "C" TYPE NAME;
6337 had been seen. Used to create compiler-generated global
6341 declare_global_var (tree name, tree type)
6345 push_to_top_level ();
6346 decl = build_decl (input_location, VAR_DECL, name, type);
6347 TREE_PUBLIC (decl) = 1;
6348 DECL_EXTERNAL (decl) = 1;
6349 DECL_ARTIFICIAL (decl) = 1;
6350 /* If the user has explicitly declared this variable (perhaps
6351 because the code we are compiling is part of a low-level runtime
6352 library), then it is possible that our declaration will be merged
6353 with theirs by pushdecl. */
6354 decl = pushdecl (decl);
6355 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6356 pop_from_top_level ();
6361 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6362 if "__cxa_atexit" is not being used) corresponding to the function
6363 to be called when the program exits. */
6366 get_atexit_fn_ptr_type (void)
6370 if (!atexit_fn_ptr_type_node)
6373 if (flag_use_cxa_atexit
6374 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6375 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6376 arg_type = ptr_type_node;
6378 /* The parameter to "atexit" is "void (*)(void)". */
6379 arg_type = NULL_TREE;
6381 fn_type = build_function_type_list (void_type_node,
6382 arg_type, NULL_TREE);
6383 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6386 return atexit_fn_ptr_type_node;
6389 /* Returns a pointer to the `atexit' function. Note that if
6390 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6391 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6394 get_atexit_node (void)
6400 bool use_aeabi_atexit;
6405 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6407 /* The declaration for `__cxa_atexit' is:
6409 int __cxa_atexit (void (*)(void *), void *, void *)
6411 We build up the argument types and then the function type
6413 tree argtype0, argtype1, argtype2;
6415 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6416 /* First, build the pointer-to-function type for the first
6418 fn_ptr_type = get_atexit_fn_ptr_type ();
6419 /* Then, build the rest of the argument types. */
6420 argtype2 = ptr_type_node;
6421 if (use_aeabi_atexit)
6423 argtype1 = fn_ptr_type;
6424 argtype0 = ptr_type_node;
6428 argtype1 = ptr_type_node;
6429 argtype0 = fn_ptr_type;
6431 /* And the final __cxa_atexit type. */
6432 fn_type = build_function_type_list (integer_type_node,
6433 argtype0, argtype1, argtype2,
6435 fn_ptr_type = build_pointer_type (fn_type);
6436 if (use_aeabi_atexit)
6437 name = "__aeabi_atexit";
6439 name = "__cxa_atexit";
6443 /* The declaration for `atexit' is:
6445 int atexit (void (*)());
6447 We build up the argument types and then the function type
6449 fn_ptr_type = get_atexit_fn_ptr_type ();
6450 /* Build the final atexit type. */
6451 fn_type = build_function_type_list (integer_type_node,
6452 fn_ptr_type, NULL_TREE);
6456 /* Now, build the function declaration. */
6457 push_lang_context (lang_name_c);
6458 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6459 mark_used (atexit_fndecl);
6460 pop_lang_context ();
6461 atexit_node = decay_conversion (atexit_fndecl);
6466 /* Returns the __dso_handle VAR_DECL. */
6469 get_dso_handle_node (void)
6471 if (dso_handle_node)
6472 return dso_handle_node;
6474 /* Declare the variable. */
6475 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6478 #ifdef HAVE_GAS_HIDDEN
6479 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6480 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6483 return dso_handle_node;
6486 /* Begin a new function with internal linkage whose job will be simply
6487 to destroy some particular variable. */
6489 static GTY(()) int start_cleanup_cnt;
6492 start_cleanup_fn (void)
6497 bool use_cxa_atexit = flag_use_cxa_atexit
6498 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6500 push_to_top_level ();
6502 /* No need to mangle this. */
6503 push_lang_context (lang_name_c);
6505 /* Build the name of the function. */
6506 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6507 /* Build the function declaration. */
6508 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6509 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6510 /* It's a function with internal linkage, generated by the
6512 TREE_PUBLIC (fndecl) = 0;
6513 DECL_ARTIFICIAL (fndecl) = 1;
6514 /* Make the function `inline' so that it is only emitted if it is
6515 actually needed. It is unlikely that it will be inlined, since
6516 it is only called via a function pointer, but we avoid unnecessary
6517 emissions this way. */
6518 DECL_DECLARED_INLINE_P (fndecl) = 1;
6519 DECL_INTERFACE_KNOWN (fndecl) = 1;
6520 /* Build the parameter. */
6525 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6526 DECL_CONTEXT (parmdecl) = fndecl;
6527 TREE_USED (parmdecl) = 1;
6528 DECL_READ_P (parmdecl) = 1;
6529 DECL_ARGUMENTS (fndecl) = parmdecl;
6533 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6535 pop_lang_context ();
6537 return current_function_decl;
6540 /* Finish the cleanup function begun by start_cleanup_fn. */
6543 end_cleanup_fn (void)
6545 expand_or_defer_fn (finish_function (0));
6547 pop_from_top_level ();
6550 /* Generate code to handle the destruction of DECL, an object with
6551 static storage duration. */
6554 register_dtor_fn (tree decl)
6561 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6563 type = TREE_TYPE (decl);
6564 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6565 return void_zero_node;
6567 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6568 a class object, we can just pass the destructor to
6569 "__cxa_atexit"; we don't have to build a temporary function to do
6571 use_dtor = (flag_use_cxa_atexit
6572 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6573 && CLASS_TYPE_P (type));
6578 /* Find the destructor. */
6579 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6580 gcc_assert (idx >= 0);
6581 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6582 /* Make sure it is accessible. */
6583 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6587 /* Call build_cleanup before we enter the anonymous function so
6588 that any access checks will be done relative to the current
6589 scope, rather than the scope of the anonymous function. */
6590 build_cleanup (decl);
6592 /* Now start the function. */
6593 cleanup = start_cleanup_fn ();
6595 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6596 to the original function, rather than the anonymous one. That
6597 will make the back end think that nested functions are in use,
6598 which causes confusion. */
6599 push_deferring_access_checks (dk_no_check);
6600 fcall = build_cleanup (decl);
6601 pop_deferring_access_checks ();
6603 /* Create the body of the anonymous function. */
6604 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6605 finish_expr_stmt (fcall);
6606 finish_compound_stmt (compound_stmt);
6610 /* Call atexit with the cleanup function. */
6611 mark_used (cleanup);
6612 cleanup = build_address (cleanup);
6613 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6619 /* We must convert CLEANUP to the type that "__cxa_atexit"
6621 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6622 /* "__cxa_atexit" will pass the address of DECL to the
6623 cleanup function. */
6625 addr = build_address (decl);
6626 /* The declared type of the parameter to "__cxa_atexit" is
6627 "void *". For plain "T*", we could just let the
6628 machinery in cp_build_function_call convert it -- but if the
6629 type is "cv-qualified T *", then we need to convert it
6630 before passing it in, to avoid spurious errors. */
6631 addr = build_nop (ptr_type_node, addr);
6634 /* Since the cleanup functions we build ignore the address
6635 they're given, there's no reason to pass the actual address
6636 in, and, in general, it's cheaper to pass NULL than any
6638 addr = null_pointer_node;
6639 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6640 tf_warning_or_error);
6641 if (targetm.cxx.use_aeabi_atexit ())
6654 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6655 arg0, arg1, arg2, NULL_TREE);
6658 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6659 is its initializer. Generate code to handle the construction
6660 and destruction of DECL. */
6663 expand_static_init (tree decl, tree init)
6665 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6666 gcc_assert (TREE_STATIC (decl));
6668 /* Some variables require no dynamic initialization. */
6670 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6673 if (DECL_FUNCTION_SCOPE_P (decl))
6675 /* Emit code to perform this initialization but once. */
6676 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6677 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6678 tree guard, guard_addr;
6681 /* Emit code to perform this initialization but once. This code
6684 static <type> guard;
6685 if (!guard.first_byte) {
6686 if (__cxa_guard_acquire (&guard)) {
6689 // Do initialization.
6690 flag = true; __cxa_guard_release (&guard);
6691 // Register variable for destruction at end of program.
6693 if (!flag) __cxa_guard_abort (&guard);
6697 Note that the `flag' variable is only set to 1 *after* the
6698 initialization is complete. This ensures that an exception,
6699 thrown during the construction, will cause the variable to
6700 reinitialized when we pass through this code again, as per:
6704 If the initialization exits by throwing an exception, the
6705 initialization is not complete, so it will be tried again
6706 the next time control enters the declaration.
6708 This process should be thread-safe, too; multiple threads
6709 should not be able to initialize the variable more than
6712 /* Create the guard variable. */
6713 guard = get_guard (decl);
6715 /* This optimization isn't safe on targets with relaxed memory
6716 consistency. On such targets we force synchronization in
6717 __cxa_guard_acquire. */
6718 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6720 /* Begin the conditional initialization. */
6721 if_stmt = begin_if_stmt ();
6722 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6723 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6726 if (flag_threadsafe_statics)
6728 tree vfntype = NULL_TREE;
6729 tree acquire_name, release_name, abort_name;
6730 tree acquire_fn, release_fn, abort_fn;
6731 guard_addr = build_address (guard);
6733 acquire_name = get_identifier ("__cxa_guard_acquire");
6734 release_name = get_identifier ("__cxa_guard_release");
6735 abort_name = get_identifier ("__cxa_guard_abort");
6736 acquire_fn = identifier_global_value (acquire_name);
6737 release_fn = identifier_global_value (release_name);
6738 abort_fn = identifier_global_value (abort_name);
6740 acquire_fn = push_library_fn
6741 (acquire_name, build_function_type_list (integer_type_node,
6742 TREE_TYPE (guard_addr),
6745 if (!release_fn || !abort_fn)
6746 vfntype = build_function_type_list (void_type_node,
6747 TREE_TYPE (guard_addr),
6750 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6752 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6754 inner_if_stmt = begin_if_stmt ();
6755 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6758 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6759 begin = get_target_expr (boolean_false_node);
6760 flag = TARGET_EXPR_SLOT (begin);
6762 TARGET_EXPR_CLEANUP (begin)
6763 = build3 (COND_EXPR, void_type_node, flag,
6765 build_call_n (abort_fn, 1, guard_addr));
6766 CLEANUP_EH_ONLY (begin) = 1;
6768 /* Do the initialization itself. */
6769 init = add_stmt_to_compound (begin, init);
6770 init = add_stmt_to_compound
6771 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6772 init = add_stmt_to_compound
6773 (init, build_call_n (release_fn, 1, guard_addr));
6776 init = add_stmt_to_compound (init, set_guard (guard));
6778 /* Use atexit to register a function for destroying this static
6780 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6782 finish_expr_stmt (init);
6784 if (flag_threadsafe_statics)
6786 finish_compound_stmt (inner_then_clause);
6787 finish_then_clause (inner_if_stmt);
6788 finish_if_stmt (inner_if_stmt);
6791 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6793 finish_compound_stmt (then_clause);
6794 finish_then_clause (if_stmt);
6795 finish_if_stmt (if_stmt);
6799 static_aggregates = tree_cons (init, decl, static_aggregates);
6803 /* Make TYPE a complete type based on INITIAL_VALUE.
6804 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6805 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6806 3 if the initializer list is empty (in pedantic mode). */
6809 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6812 tree type, elt_type;
6816 unsigned HOST_WIDE_INT i;
6819 /* An array of character type can be initialized from a
6820 brace-enclosed string constant.
6822 FIXME: this code is duplicated from reshape_init. Probably
6823 we should just call reshape_init here? */
6824 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6825 && TREE_CODE (initial_value) == CONSTRUCTOR
6826 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6828 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6829 tree value = VEC_index (constructor_elt, v, 0)->value;
6831 if (TREE_CODE (value) == STRING_CST
6832 && VEC_length (constructor_elt, v) == 1)
6833 initial_value = value;
6836 /* If any of the elements are parameter packs, we can't actually
6837 complete this type now because the array size is dependent. */
6838 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6840 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6843 if (PACK_EXPANSION_P (value))
6849 failure = complete_array_type (ptype, initial_value, do_default);
6851 /* We can create the array before the element type is complete, which
6852 means that we didn't have these two bits set in the original type
6853 either. In completing the type, we are expected to propagate these
6854 bits. See also complete_type which does the same thing for arrays
6857 if (TYPE_DOMAIN (type))
6859 elt_type = TREE_TYPE (type);
6860 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6861 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6862 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6868 /* As above, but either give an error or reject zero-size arrays, depending
6872 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6873 bool do_default, tsubst_flags_t complain)
6876 bool sfinae = !(complain & tf_error);
6877 /* In SFINAE context we can't be lenient about zero-size arrays. */
6880 failure = cp_complete_array_type (ptype, initial_value, do_default);
6886 /* Not an error. */;
6887 else if (failure == 1)
6888 error ("initializer fails to determine size of %qT", *ptype);
6889 else if (failure == 2)
6892 error ("array size missing in %qT", *ptype);
6894 else if (failure == 3)
6895 error ("zero-size array %qT", *ptype);
6896 *ptype = error_mark_node;
6901 /* Return zero if something is declared to be a member of type
6902 CTYPE when in the context of CUR_TYPE. STRING is the error
6903 message to print in that case. Otherwise, quietly return 1. */
6906 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6908 if (ctype && ctype != cur_type)
6910 if (flags == DTOR_FLAG)
6911 error ("destructor for alien class %qT cannot be a member", ctype);
6913 error ("constructor for alien class %qT cannot be a member", ctype);
6919 /* Subroutine of `grokdeclarator'. */
6921 /* Generate errors possibly applicable for a given set of specifiers.
6922 This is for ARM $7.1.2. */
6925 bad_specifiers (tree object,
6926 enum bad_spec_place type,
6937 error ("%qD declared as a %<virtual%> variable", object);
6939 error ("%qD declared as an %<inline%> variable", object);
6941 error ("%<const%> and %<volatile%> function specifiers on "
6942 "%qD invalid in variable declaration", object);
6946 error ("%qD declared as a %<virtual%> parameter", object);
6948 error ("%qD declared as an %<inline%> parameter", object);
6950 error ("%<const%> and %<volatile%> function specifiers on "
6951 "%qD invalid in parameter declaration", object);
6955 error ("%qD declared as a %<virtual%> type", object);
6957 error ("%qD declared as an %<inline%> type", object);
6959 error ("%<const%> and %<volatile%> function specifiers on "
6960 "%qD invalid in type declaration", object);
6964 error ("%qD declared as a %<virtual%> field", object);
6966 error ("%qD declared as an %<inline%> field", object);
6968 error ("%<const%> and %<volatile%> function specifiers on "
6969 "%qD invalid in field declaration", object);
6975 error ("%q+D declared as a friend", object);
6977 && (TREE_CODE (object) == TYPE_DECL
6978 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6979 && !TYPE_REFFN_P (TREE_TYPE (object))
6980 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6981 error ("%q+D declared with an exception specification", object);
6984 /* DECL is a member function or static data member and is presently
6985 being defined. Check that the definition is taking place in a
6989 check_class_member_definition_namespace (tree decl)
6991 /* These checks only apply to member functions and static data
6993 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6994 || TREE_CODE (decl) == VAR_DECL);
6995 /* We check for problems with specializations in pt.c in
6996 check_specialization_namespace, where we can issue better
6998 if (processing_specialization)
7000 /* There are no restrictions on the placement of
7001 explicit instantiations. */
7002 if (processing_explicit_instantiation)
7006 A member function definition that appears outside of the
7007 class definition shall appear in a namespace scope enclosing
7008 the class definition.
7012 The definition for a static data member shall appear in a
7013 namespace scope enclosing the member's class definition. */
7014 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7015 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7016 decl, DECL_CONTEXT (decl));
7019 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7020 METHOD_TYPE for a non-static member function; QUALS are the
7021 cv-qualifiers that apply to the function. */
7024 build_this_parm (tree type, cp_cv_quals quals)
7029 cp_cv_quals this_quals;
7031 if (CLASS_TYPE_P (type))
7034 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7035 this_type = build_pointer_type (this_type);
7038 this_type = type_of_this_parm (type);
7039 /* The `this' parameter is implicitly `const'; it cannot be
7041 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7042 qual_type = cp_build_qualified_type (this_type, this_quals);
7043 parm = build_artificial_parm (this_identifier, qual_type);
7044 cp_apply_type_quals_to_decl (this_quals, parm);
7048 /* DECL is a static member function. Complain if it was declared
7049 with function-cv-quals. */
7052 check_static_quals (tree decl, cp_cv_quals quals)
7054 if (quals != TYPE_UNQUALIFIED)
7055 error ("static member function %q#D declared with type qualifiers",
7059 /* CTYPE is class type, or null if non-class.
7060 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7062 DECLARATOR is the function's name.
7063 PARMS is a chain of PARM_DECLs for the function.
7064 VIRTUALP is truthvalue of whether the function is virtual or not.
7065 FLAGS are to be passed through to `grokclassfn'.
7066 QUALS are qualifiers indicating whether the function is `const'
7068 RAISES is a list of exceptions that this function can raise.
7069 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7070 not look, and -1 if we should not call `grokclassfn' at all.
7072 SFK is the kind of special function (if any) for the new function.
7074 Returns `NULL_TREE' if something goes wrong, after issuing
7075 applicable error messages. */
7078 grokfndecl (tree ctype,
7082 tree orig_declarator,
7084 enum overload_flags flags,
7091 special_function_kind sfk,
7096 location_t location)
7099 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7103 type = build_exception_variant (type, raises);
7105 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7107 /* If we have an explicit location, use it, otherwise use whatever
7108 build_lang_decl used (probably input_location). */
7109 if (location != UNKNOWN_LOCATION)
7110 DECL_SOURCE_LOCATION (decl) = location;
7112 if (TREE_CODE (type) == METHOD_TYPE)
7115 parm = build_this_parm (type, quals);
7116 DECL_CHAIN (parm) = parms;
7119 DECL_ARGUMENTS (decl) = parms;
7120 for (t = parms; t; t = DECL_CHAIN (t))
7121 DECL_CONTEXT (t) = decl;
7122 /* Propagate volatile out from type to decl. */
7123 if (TYPE_VOLATILE (type))
7124 TREE_THIS_VOLATILE (decl) = 1;
7126 /* Setup decl according to sfk. */
7129 case sfk_constructor:
7130 case sfk_copy_constructor:
7131 case sfk_move_constructor:
7132 DECL_CONSTRUCTOR_P (decl) = 1;
7134 case sfk_destructor:
7135 DECL_DESTRUCTOR_P (decl) = 1;
7141 /* If pointers to member functions use the least significant bit to
7142 indicate whether a function is virtual, ensure a pointer
7143 to this function will have that bit clear. */
7144 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7145 && TREE_CODE (type) == METHOD_TYPE
7146 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7147 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7150 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7154 ("defining explicit specialization %qD in friend declaration",
7158 tree fns = TREE_OPERAND (orig_declarator, 0);
7159 tree args = TREE_OPERAND (orig_declarator, 1);
7161 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7163 /* Something like `template <class T> friend void f<T>()'. */
7164 error ("invalid use of template-id %qD in declaration "
7165 "of primary template",
7171 /* A friend declaration of the form friend void f<>(). Record
7172 the information in the TEMPLATE_ID_EXPR. */
7173 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7175 if (TREE_CODE (fns) == COMPONENT_REF)
7177 /* Due to bison parser ickiness, we will have already looked
7178 up an operator_name or PFUNCNAME within the current class
7179 (see template_id in parse.y). If the current class contains
7180 such a name, we'll get a COMPONENT_REF here. Undo that. */
7182 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7183 == current_class_type);
7184 fns = TREE_OPERAND (fns, 1);
7186 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7187 || TREE_CODE (fns) == OVERLOAD);
7188 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7190 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7191 if (TREE_PURPOSE (t)
7192 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7194 error ("default arguments are not allowed in declaration "
7195 "of friend template specialization %qD",
7202 error ("%<inline%> is not allowed in declaration of friend "
7203 "template specialization %qD",
7210 /* If this decl has namespace scope, set that up. */
7212 set_decl_namespace (decl, in_namespace, friendp);
7214 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7216 /* `main' and builtins have implicit 'C' linkage. */
7217 if ((MAIN_NAME_P (declarator)
7218 || (IDENTIFIER_LENGTH (declarator) > 10
7219 && IDENTIFIER_POINTER (declarator)[0] == '_'
7220 && IDENTIFIER_POINTER (declarator)[1] == '_'
7221 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7222 && current_lang_name == lang_name_cplusplus
7223 && ctype == NULL_TREE
7224 && DECL_FILE_SCOPE_P (decl))
7225 SET_DECL_LANGUAGE (decl, lang_c);
7227 /* Should probably propagate const out from type to decl I bet (mrs). */
7230 DECL_STATIC_FUNCTION_P (decl) = 1;
7231 DECL_CONTEXT (decl) = ctype;
7236 DECL_CONTEXT (decl) = ctype;
7238 check_class_member_definition_namespace (decl);
7241 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7243 if (processing_template_decl)
7244 error ("cannot declare %<::main%> to be a template");
7246 error ("cannot declare %<::main%> to be inline");
7248 error ("cannot declare %<::main%> to be static");
7253 /* Members of anonymous types and local classes have no linkage; make
7254 them internal. If a typedef is made later, this will be changed. */
7255 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7256 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7259 if (publicp && cxx_dialect == cxx98)
7261 /* [basic.link]: A name with no linkage (notably, the name of a class
7262 or enumeration declared in a local scope) shall not be used to
7263 declare an entity with linkage.
7265 DR 757 relaxes this restriction for C++0x. */
7266 t = no_linkage_check (TREE_TYPE (decl),
7267 /*relaxed_p=*/false);
7270 if (TYPE_ANONYMOUS_P (t))
7272 if (DECL_EXTERN_C_P (decl))
7273 /* Allow this; it's pretty common in C. */;
7276 permerror (input_location, "anonymous type with no linkage "
7277 "used to declare function %q#D with linkage",
7279 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7280 permerror (input_location, "%q+#D does not refer to the unqualified "
7281 "type, so it is not used for linkage",
7286 permerror (input_location, "type %qT with no linkage used to "
7287 "declare function %q#D with linkage", t, decl);
7291 TREE_PUBLIC (decl) = publicp;
7294 DECL_INTERFACE_KNOWN (decl) = 1;
7295 DECL_NOT_REALLY_EXTERN (decl) = 1;
7298 /* If the declaration was declared inline, mark it as such. */
7300 DECL_DECLARED_INLINE_P (decl) = 1;
7302 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7304 DECL_EXTERNAL (decl) = 1;
7305 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7308 ? G_("static member function %qD cannot have cv-qualifier")
7309 : G_("non-member function %qD cannot have cv-qualifier"),
7311 quals = TYPE_UNQUALIFIED;
7314 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7315 && !grok_op_properties (decl, /*complain=*/true))
7319 /* Make the init_value nonzero so pushdecl knows this is not
7320 tentative. error_mark_node is replaced later with the BLOCK. */
7321 DECL_INITIAL (decl) = error_mark_node;
7323 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7324 TREE_NOTHROW (decl) = 1;
7326 /* Caller will do the rest of this. */
7330 if (ctype != NULL_TREE)
7331 grokclassfn (ctype, decl, flags);
7333 decl = check_explicit_specialization (orig_declarator, decl,
7336 4 * (friendp != 0));
7337 if (decl == error_mark_node)
7340 if (DECL_STATIC_FUNCTION_P (decl))
7341 check_static_quals (decl, quals);
7345 cplus_decl_attributes (&decl, *attrlist, 0);
7346 *attrlist = NULL_TREE;
7349 /* Check main's type after attributes have been applied. */
7350 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7352 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7355 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7357 error ("%<::main%> must return %<int%>");
7358 newtype = build_function_type (integer_type_node, oldtypeargs);
7359 TREE_TYPE (decl) = newtype;
7362 check_main_parameter_types (decl);
7365 if (ctype != NULL_TREE
7366 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7369 tree old_decl = check_classfn (ctype, decl,
7370 (processing_template_decl
7371 > template_class_depth (ctype))
7372 ? current_template_parms
7375 if (old_decl == error_mark_node)
7383 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7384 /* Because grokfndecl is always supposed to return a
7385 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7386 here. We depend on our callers to figure out that its
7387 really a template that's being returned. */
7388 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7390 if (DECL_STATIC_FUNCTION_P (old_decl)
7391 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7393 /* Remove the `this' parm added by grokclassfn. */
7394 revert_static_member_fn (decl);
7395 check_static_quals (decl, quals);
7397 if (DECL_ARTIFICIAL (old_decl))
7399 error ("definition of implicitly-declared %qD", old_decl);
7403 /* Since we've smashed OLD_DECL to its
7404 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7405 if (TREE_CODE (decl) == TEMPLATE_DECL)
7406 decl = DECL_TEMPLATE_RESULT (decl);
7408 /* Attempt to merge the declarations. This can fail, in
7409 the case of some invalid specialization declarations. */
7410 pushed_scope = push_scope (ctype);
7411 ok = duplicate_decls (decl, old_decl, friendp);
7413 pop_scope (pushed_scope);
7416 error ("no %q#D member function declared in class %qT",
7424 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7427 if (ctype == NULL_TREE || check)
7431 DECL_VIRTUAL_P (decl) = 1;
7436 /* decl is a FUNCTION_DECL.
7437 specifiers are the parsed virt-specifiers.
7439 Set flags to reflect the virt-specifiers.
7444 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7446 if (decl == NULL_TREE)
7448 if (specifiers & VIRT_SPEC_OVERRIDE)
7449 DECL_OVERRIDE_P (decl) = 1;
7450 if (specifiers & VIRT_SPEC_FINAL)
7451 DECL_FINAL_P (decl) = 1;
7455 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7456 the linkage that DECL will receive in the object file. */
7459 set_linkage_for_static_data_member (tree decl)
7461 /* A static data member always has static storage duration and
7462 external linkage. Note that static data members are forbidden in
7463 local classes -- the only situation in which a class has
7464 non-external linkage. */
7465 TREE_PUBLIC (decl) = 1;
7466 TREE_STATIC (decl) = 1;
7467 /* For non-template classes, static data members are always put
7468 out in exactly those files where they are defined, just as
7469 with ordinary namespace-scope variables. */
7470 if (!processing_template_decl)
7471 DECL_INTERFACE_KNOWN (decl) = 1;
7474 /* Create a VAR_DECL named NAME with the indicated TYPE.
7476 If SCOPE is non-NULL, it is the class type or namespace containing
7477 the variable. If SCOPE is NULL, the variable should is created in
7478 the innermost enclosings scope. */
7481 grokvardecl (tree type,
7483 const cp_decl_specifier_seq *declspecs,
7489 tree explicit_scope;
7491 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7493 /* Compute the scope in which to place the variable, but remember
7494 whether or not that scope was explicitly specified by the user. */
7495 explicit_scope = scope;
7498 /* An explicit "extern" specifier indicates a namespace-scope
7500 if (declspecs->storage_class == sc_extern)
7501 scope = current_decl_namespace ();
7502 else if (!at_function_scope_p ())
7503 scope = current_scope ();
7507 && (/* If the variable is a namespace-scope variable declared in a
7508 template, we need DECL_LANG_SPECIFIC. */
7509 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7510 /* Similarly for namespace-scope variables with language linkage
7512 || (TREE_CODE (scope) == NAMESPACE_DECL
7513 && current_lang_name != lang_name_cplusplus)
7514 /* Similarly for static data members. */
7516 decl = build_lang_decl (VAR_DECL, name, type);
7518 decl = build_decl (input_location, VAR_DECL, name, type);
7520 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7521 set_decl_namespace (decl, explicit_scope, 0);
7523 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7525 if (declspecs->storage_class == sc_extern)
7527 DECL_THIS_EXTERN (decl) = 1;
7528 DECL_EXTERNAL (decl) = !initialized;
7531 if (DECL_CLASS_SCOPE_P (decl))
7533 set_linkage_for_static_data_member (decl);
7534 /* This function is only called with out-of-class definitions. */
7535 DECL_EXTERNAL (decl) = 0;
7536 check_class_member_definition_namespace (decl);
7538 /* At top level, either `static' or no s.c. makes a definition
7539 (perhaps tentative), and absence of `static' makes it public. */
7540 else if (toplevel_bindings_p ())
7542 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7543 && (DECL_THIS_EXTERN (decl) || ! constp));
7544 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7546 /* Not at top level, only `static' makes a static definition. */
7549 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7550 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7553 if (declspecs->specs[(int)ds_thread])
7554 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7556 /* If the type of the decl has no linkage, make sure that we'll
7557 notice that in mark_used. */
7558 if (cxx_dialect > cxx98
7559 && decl_linkage (decl) != lk_none
7560 && DECL_LANG_SPECIFIC (decl) == NULL
7561 && !DECL_EXTERN_C_P (decl)
7562 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7563 retrofit_lang_decl (decl);
7565 if (TREE_PUBLIC (decl))
7567 /* [basic.link]: A name with no linkage (notably, the name of a class
7568 or enumeration declared in a local scope) shall not be used to
7569 declare an entity with linkage.
7571 DR 757 relaxes this restriction for C++0x. */
7572 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7573 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7576 if (TYPE_ANONYMOUS_P (t))
7578 if (DECL_EXTERN_C_P (decl))
7579 /* Allow this; it's pretty common in C. */
7583 /* DRs 132, 319 and 389 seem to indicate types with
7584 no linkage can only be used to declare extern "C"
7585 entities. Since it's not always an error in the
7586 ISO C++ 90 Standard, we only issue a warning. */
7587 warning (0, "anonymous type with no linkage used to declare "
7588 "variable %q#D with linkage", decl);
7589 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7590 warning (0, "%q+#D does not refer to the unqualified "
7591 "type, so it is not used for linkage",
7596 warning (0, "type %qT with no linkage used to declare variable "
7597 "%q#D with linkage", t, decl);
7601 DECL_INTERFACE_KNOWN (decl) = 1;
7606 /* Create and return a canonical pointer to member function type, for
7607 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7610 build_ptrmemfunc_type (tree type)
7614 tree unqualified_variant = NULL_TREE;
7616 if (type == error_mark_node)
7619 /* If a canonical type already exists for this type, use it. We use
7620 this method instead of type_hash_canon, because it only does a
7621 simple equality check on the list of field members. */
7623 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7626 /* Make sure that we always have the unqualified pointer-to-member
7628 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7630 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7632 t = make_class_type (RECORD_TYPE);
7633 xref_basetypes (t, NULL_TREE);
7635 /* Let the front end know this is a pointer to member function... */
7636 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7637 /* ... and not really a class type. */
7638 SET_CLASS_TYPE_P (t, 0);
7640 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7643 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7645 DECL_CHAIN (field) = fields;
7648 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7650 /* Zap out the name so that the back end will give us the debugging
7651 information for this anonymous RECORD_TYPE. */
7652 TYPE_NAME (t) = NULL_TREE;
7654 /* If this is not the unqualified form of this pointer-to-member
7655 type, set the TYPE_MAIN_VARIANT for this type to be the
7656 unqualified type. Since they are actually RECORD_TYPEs that are
7657 not variants of each other, we must do this manually.
7658 As we just built a new type there is no need to do yet another copy. */
7659 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7661 int type_quals = cp_type_quals (type);
7662 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7663 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7664 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7665 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7666 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7667 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7668 TREE_TYPE (TYPE_BINFO (t)) = t;
7671 /* Cache this pointer-to-member type so that we can find it again
7673 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7675 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7676 SET_TYPE_STRUCTURAL_EQUALITY (t);
7677 else if (TYPE_CANONICAL (type) != type)
7678 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7683 /* Create and return a pointer to data member type. */
7686 build_ptrmem_type (tree class_type, tree member_type)
7688 if (TREE_CODE (member_type) == METHOD_TYPE)
7690 cp_cv_quals quals = type_memfn_quals (member_type);
7691 member_type = build_memfn_type (member_type, class_type, quals);
7692 return build_ptrmemfunc_type (build_pointer_type (member_type));
7696 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7697 return build_offset_type (class_type, member_type);
7701 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7702 Check to see that the definition is valid. Issue appropriate error
7703 messages. Return 1 if the definition is particularly bad, or 0
7707 check_static_variable_definition (tree decl, tree type)
7709 /* Can't check yet if we don't know the type. */
7710 if (dependent_type_p (type))
7712 /* If DECL is declared constexpr, we'll do the appropriate checks
7713 in check_initializer. */
7714 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7716 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7718 if (literal_type_p (type))
7719 error ("%<constexpr%> needed for in-class initialization of static "
7720 "data member %q#D of non-integral type", decl);
7722 error ("in-class initialization of static data member %q#D of "
7723 "non-literal type", decl);
7727 /* Motion 10 at San Diego: If a static const integral data member is
7728 initialized with an integral constant expression, the initializer
7729 may appear either in the declaration (within the class), or in
7730 the definition, but not both. If it appears in the class, the
7731 member is a member constant. The file-scope definition is always
7733 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7735 error ("invalid in-class initialization of static data member "
7736 "of non-integral type %qT",
7740 else if (!CP_TYPE_CONST_P (type))
7741 error ("ISO C++ forbids in-class initialization of non-const "
7742 "static member %qD",
7744 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7745 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7746 "%qD of non-integral type %qT", decl, type);
7751 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7752 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7753 expressions out into temporary variables so that walk_tree doesn't
7754 step into them (c++/15764). */
7757 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7759 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7760 tree expr = *expr_p;
7761 if (TREE_CODE (expr) == SAVE_EXPR)
7763 tree op = TREE_OPERAND (expr, 0);
7764 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7765 if (TREE_SIDE_EFFECTS (op))
7766 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7769 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7774 /* Entry point for the above. */
7777 stabilize_vla_size (tree size)
7779 struct pointer_set_t *pset = pointer_set_create ();
7780 /* Break out any function calls into temporary variables. */
7781 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7784 /* Given the SIZE (i.e., number of elements) in an array, compute an
7785 appropriate index type for the array. If non-NULL, NAME is the
7786 name of the thing being declared. */
7789 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7794 tree abi_1_itype = NULL_TREE;
7796 if (error_operand_p (size))
7797 return error_mark_node;
7799 type = TREE_TYPE (size);
7800 /* type_dependent_expression_p? */
7801 if (!dependent_type_p (type))
7803 mark_rvalue_use (size);
7805 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7806 && TREE_SIDE_EFFECTS (size))
7807 /* In C++98, we mark a non-constant array bound with a magic
7808 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7811 size = fold_non_dependent_expr (size);
7813 if (CLASS_TYPE_P (type)
7814 && CLASSTYPE_LITERAL_P (type))
7816 size = build_expr_type_conversion (WANT_INT, size, true);
7819 if (!(complain & tf_error))
7820 return error_mark_node;
7822 error ("size of array %qD has non-integral type %qT",
7825 error ("size of array has non-integral type %qT", type);
7826 size = integer_one_node;
7828 if (size == error_mark_node)
7829 return error_mark_node;
7830 type = TREE_TYPE (size);
7831 /* We didn't support this case in GCC 3.2, so don't bother
7832 trying to model it now in ABI v1. */
7833 abi_1_itype = error_mark_node;
7836 size = maybe_constant_value (size);
7837 if (!TREE_CONSTANT (size))
7841 if (error_operand_p (size))
7842 return error_mark_node;
7844 /* The array bound must be an integer type. */
7845 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7847 if (!(complain & tf_error))
7848 return error_mark_node;
7850 error ("size of array %qD has non-integral type %qT", name, type);
7852 error ("size of array has non-integral type %qT", type);
7853 size = integer_one_node;
7854 type = TREE_TYPE (size);
7858 /* A type is dependent if it is...an array type constructed from any
7859 dependent type or whose size is specified by a constant expression
7860 that is value-dependent. */
7861 /* We can only call value_dependent_expression_p on integral constant
7862 expressions; treat non-constant expressions as dependent, too. */
7863 if (processing_template_decl
7864 && (dependent_type_p (type)
7865 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7867 /* We cannot do any checking for a SIZE that isn't known to be
7868 constant. Just build the index type and mark that it requires
7869 structural equality checks. */
7870 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7871 size, integer_one_node));
7872 TYPE_DEPENDENT_P (itype) = 1;
7873 TYPE_DEPENDENT_P_VALID (itype) = 1;
7874 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7878 if (!abi_version_at_least (2) && processing_template_decl
7879 && abi_1_itype == NULL_TREE)
7880 /* For abi-1, we handled all instances in templates the same way,
7881 even when they were non-dependent. This affects the manglings
7882 produced. So, we do the normal checking for non-dependent
7883 sizes, but at the end we'll return the same type that abi-1
7884 would have, but with TYPE_CANONICAL set to the "right"
7885 value that the current ABI would provide. */
7886 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7887 osize, integer_one_node));
7889 /* Normally, the array-bound will be a constant. */
7890 if (TREE_CODE (size) == INTEGER_CST)
7892 /* Check to see if the array bound overflowed. Make that an
7893 error, no matter how generous we're being. */
7894 constant_expression_error (size);
7896 /* An array must have a positive number of elements. */
7897 if (INT_CST_LT (size, integer_zero_node))
7899 if (!(complain & tf_error))
7900 return error_mark_node;
7902 error ("size of array %qD is negative", name);
7904 error ("size of array is negative");
7905 size = integer_one_node;
7907 /* As an extension we allow zero-sized arrays. */
7908 else if (integer_zerop (size))
7910 if (!(complain & tf_error))
7911 /* We must fail if performing argument deduction (as
7912 indicated by the state of complain), so that
7913 another substitution can be found. */
7914 return error_mark_node;
7915 else if (in_system_header)
7916 /* Allow them in system headers because glibc uses them. */;
7918 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7920 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7923 else if (TREE_CONSTANT (size)
7924 /* We don't allow VLAs at non-function scopes, or during
7925 tentative template substitution. */
7926 || !at_function_scope_p () || !(complain & tf_error))
7928 if (!(complain & tf_error))
7929 return error_mark_node;
7930 /* `(int) &fn' is not a valid array bound. */
7932 error ("size of array %qD is not an integral constant-expression",
7935 error ("size of array is not an integral constant-expression");
7936 size = integer_one_node;
7938 else if (pedantic && warn_vla != 0)
7941 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7943 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7945 else if (warn_vla > 0)
7949 "variable length array %qD is used", name);
7952 "variable length array is used");
7955 if (processing_template_decl && !TREE_CONSTANT (size))
7956 /* A variable sized array. */
7957 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7960 HOST_WIDE_INT saved_processing_template_decl;
7962 /* Compute the index of the largest element in the array. It is
7963 one less than the number of elements in the array. We save
7964 and restore PROCESSING_TEMPLATE_DECL so that computations in
7965 cp_build_binary_op will be appropriately folded. */
7966 saved_processing_template_decl = processing_template_decl;
7967 processing_template_decl = 0;
7968 itype = cp_build_binary_op (input_location,
7970 cp_convert (ssizetype, size),
7971 cp_convert (ssizetype, integer_one_node),
7972 tf_warning_or_error);
7973 itype = fold (itype);
7974 processing_template_decl = saved_processing_template_decl;
7976 if (!TREE_CONSTANT (itype))
7977 /* A variable sized array. */
7978 itype = variable_size (itype);
7979 /* Make sure that there was no overflow when creating to a signed
7980 index type. (For example, on a 32-bit machine, an array with
7981 size 2^32 - 1 is too big.) */
7982 else if (TREE_CODE (itype) == INTEGER_CST
7983 && TREE_OVERFLOW (itype))
7985 if (!(complain & tf_error))
7986 return error_mark_node;
7987 error ("overflow in array dimension");
7988 TREE_OVERFLOW (itype) = 0;
7992 /* Create and return the appropriate index type. */
7993 if (abi_1_itype && abi_1_itype != error_mark_node)
7995 tree t = build_index_type (itype);
7996 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7997 itype = abi_1_itype;
8000 itype = build_index_type (itype);
8002 /* If the index type were dependent, we would have returned early, so
8003 remember that it isn't. */
8004 TYPE_DEPENDENT_P (itype) = 0;
8005 TYPE_DEPENDENT_P_VALID (itype) = 1;
8009 /* Returns the scope (if any) in which the entity declared by
8010 DECLARATOR will be located. If the entity was declared with an
8011 unqualified name, NULL_TREE is returned. */
8014 get_scope_of_declarator (const cp_declarator *declarator)
8016 while (declarator && declarator->kind != cdk_id)
8017 declarator = declarator->declarator;
8019 /* If the declarator-id is a SCOPE_REF, the scope in which the
8020 declaration occurs is the first operand. */
8022 && declarator->u.id.qualifying_scope)
8023 return declarator->u.id.qualifying_scope;
8025 /* Otherwise, the declarator is not a qualified name; the entity will
8026 be declared in the current scope. */
8030 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8031 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8035 create_array_type_for_decl (tree name, tree type, tree size)
8037 tree itype = NULL_TREE;
8039 /* If things have already gone awry, bail now. */
8040 if (type == error_mark_node || size == error_mark_node)
8041 return error_mark_node;
8043 /* 8.3.4/1: If the type of the identifier of D contains the auto
8044 type-specifier, the program is ill-formed. */
8045 if (pedantic && type_uses_auto (type))
8046 pedwarn (input_location, OPT_pedantic,
8047 "declaration of %qD as array of %<auto%>", name);
8049 /* If there are some types which cannot be array elements,
8050 issue an error-message and return. */
8051 switch (TREE_CODE (type))
8055 error ("declaration of %qD as array of void", name);
8057 error ("creating array of void");
8058 return error_mark_node;
8062 error ("declaration of %qD as array of functions", name);
8064 error ("creating array of functions");
8065 return error_mark_node;
8067 case REFERENCE_TYPE:
8069 error ("declaration of %qD as array of references", name);
8071 error ("creating array of references");
8072 return error_mark_node;
8076 error ("declaration of %qD as array of function members", name);
8078 error ("creating array of function members");
8079 return error_mark_node;
8087 The constant expressions that specify the bounds of the arrays
8088 can be omitted only for the first member of the sequence. */
8089 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8092 error ("declaration of %qD as multidimensional array must "
8093 "have bounds for all dimensions except the first",
8096 error ("multidimensional array must have bounds for all "
8097 "dimensions except the first");
8099 return error_mark_node;
8102 /* Figure out the index type for the array. */
8104 itype = compute_array_index_type (name, size, tf_warning_or_error);
8107 T is called the array element type; this type shall not be [...] an
8108 abstract class type. */
8109 abstract_virtuals_error (name, type);
8111 return build_cplus_array_type (type, itype);
8114 /* Check that it's OK to declare a function with the indicated TYPE.
8115 SFK indicates the kind of special function (if any) that this
8116 function is. OPTYPE is the type given in a conversion operator
8117 declaration, or the class type for a constructor/destructor.
8118 Returns the actual return type of the function; that
8119 may be different than TYPE if an error occurs, or for certain
8120 special functions. */
8123 check_special_function_return_type (special_function_kind sfk,
8129 case sfk_constructor:
8131 error ("return type specification for constructor invalid");
8133 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8134 type = build_pointer_type (optype);
8136 type = void_type_node;
8139 case sfk_destructor:
8141 error ("return type specification for destructor invalid");
8142 /* We can't use the proper return type here because we run into
8143 problems with ambiguous bases and covariant returns.
8144 Java classes are left unchanged because (void *) isn't a valid
8145 Java type, and we don't want to change the Java ABI. */
8146 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8147 type = build_pointer_type (void_type_node);
8149 type = void_type_node;
8152 case sfk_conversion:
8154 error ("return type specified for %<operator %T%>", optype);
8165 /* A variable or data member (whose unqualified name is IDENTIFIER)
8166 has been declared with the indicated TYPE. If the TYPE is not
8167 acceptable, issue an error message and return a type to use for
8168 error-recovery purposes. */
8171 check_var_type (tree identifier, tree type)
8173 if (VOID_TYPE_P (type))
8176 error ("unnamed variable or field declared void");
8177 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8179 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8180 error ("variable or field %qE declared void", identifier);
8183 error ("variable or field declared void");
8184 type = error_mark_node;
8190 /* Given declspecs and a declarator (abstract or otherwise), determine
8191 the name and type of the object declared and construct a DECL node
8194 DECLSPECS points to the representation of declaration-specifier
8195 sequence that precedes declarator.
8197 DECL_CONTEXT says which syntactic context this declaration is in:
8198 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8199 FUNCDEF for a function definition. Like NORMAL but a few different
8200 error messages in each case. Return value may be zero meaning
8201 this definition is too screwy to try to parse.
8202 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8203 handle member functions (which have FIELD context).
8204 Return value may be zero meaning this definition is too screwy to
8206 PARM for a parameter declaration (either within a function prototype
8207 or before a function body). Make a PARM_DECL, or return void_type_node.
8208 TPARM for a template parameter declaration.
8209 CATCHPARM for a parameter declaration before a catch clause.
8210 TYPENAME if for a typename (in a cast or sizeof).
8211 Don't make a DECL node; just return the ..._TYPE node.
8212 FIELD for a struct or union field; make a FIELD_DECL.
8213 BITFIELD for a field with specified width.
8215 INITIALIZED is as for start_decl.
8217 ATTRLIST is a pointer to the list of attributes, which may be NULL
8218 if there are none; *ATTRLIST may be modified if attributes from inside
8219 the declarator should be applied to the declaration.
8221 When this function is called, scoping variables (such as
8222 CURRENT_CLASS_TYPE) should reflect the scope in which the
8223 declaration occurs, not the scope in which the new declaration will
8224 be placed. For example, on:
8228 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8231 Returns a DECL (if a declarator is present), a TYPE (if there is no
8232 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8236 grokdeclarator (const cp_declarator *declarator,
8237 const cp_decl_specifier_seq *declspecs,
8238 enum decl_context decl_context,
8242 tree type = NULL_TREE;
8244 int explicit_int128 = 0;
8245 int virtualp, explicitp, friendp, inlinep, staticp;
8246 int explicit_int = 0;
8247 int explicit_char = 0;
8248 int defaulted_int = 0;
8249 tree dependent_name = NULL_TREE;
8251 tree typedef_decl = NULL_TREE;
8252 const char *name = NULL;
8253 tree typedef_type = NULL_TREE;
8254 /* True if this declarator is a function definition. */
8255 bool funcdef_flag = false;
8256 cp_declarator_kind innermost_code = cdk_error;
8259 /* See the code below that used this. */
8260 tree decl_attr = NULL_TREE;
8263 /* Keep track of what sort of function is being processed
8264 so that we can warn about default return values, or explicit
8265 return values which do not match prescribed defaults. */
8266 special_function_kind sfk = sfk_none;
8268 tree dname = NULL_TREE;
8269 tree ctor_return_type = NULL_TREE;
8270 enum overload_flags flags = NO_SPECIAL;
8271 /* cv-qualifiers that apply to the declarator, for a declaration of
8272 a member function. */
8273 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8274 /* virt-specifiers that apply to the declarator, for a declaration of
8275 a member function. */
8276 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8277 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8279 tree raises = NULL_TREE;
8280 int template_count = 0;
8281 tree returned_attrs = NULL_TREE;
8282 tree parms = NULL_TREE;
8283 const cp_declarator *id_declarator;
8284 /* The unqualified name of the declarator; either an
8285 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8286 tree unqualified_id;
8287 /* The class type, if any, in which this entity is located,
8288 or NULL_TREE if none. Note that this value may be different from
8289 the current class type; for example if an attempt is made to declare
8290 "A::f" inside "B", this value will be "A". */
8291 tree ctype = current_class_type;
8292 /* The NAMESPACE_DECL for the namespace in which this entity is
8293 located. If an unqualified name is used to declare the entity,
8294 this value will be NULL_TREE, even if the entity is located at
8296 tree in_namespace = NULL_TREE;
8297 cp_storage_class storage_class;
8298 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8299 bool type_was_error_mark_node = false;
8300 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8301 bool template_type_arg = false;
8302 bool template_parm_flag = false;
8303 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8306 signed_p = declspecs->specs[(int)ds_signed];
8307 unsigned_p = declspecs->specs[(int)ds_unsigned];
8308 short_p = declspecs->specs[(int)ds_short];
8309 long_p = declspecs->specs[(int)ds_long];
8310 longlong = declspecs->specs[(int)ds_long] >= 2;
8311 explicit_int128 = declspecs->explicit_int128_p;
8312 thread_p = declspecs->specs[(int)ds_thread];
8314 if (decl_context == FUNCDEF)
8315 funcdef_flag = true, decl_context = NORMAL;
8316 else if (decl_context == MEMFUNCDEF)
8317 funcdef_flag = true, decl_context = FIELD;
8318 else if (decl_context == BITFIELD)
8319 bitfield = 1, decl_context = FIELD;
8320 else if (decl_context == TEMPLATE_TYPE_ARG)
8321 template_type_arg = true, decl_context = TYPENAME;
8322 else if (decl_context == TPARM)
8323 template_parm_flag = true, decl_context = PARM;
8325 if (initialized > 1)
8326 funcdef_flag = true;
8328 /* Look inside a declarator for the name being declared
8329 and get it as a string, for an error message. */
8330 for (id_declarator = declarator;
8332 id_declarator = id_declarator->declarator)
8334 if (id_declarator->kind != cdk_id)
8335 innermost_code = id_declarator->kind;
8337 switch (id_declarator->kind)
8340 if (id_declarator->declarator
8341 && id_declarator->declarator->kind == cdk_id)
8343 sfk = id_declarator->declarator->u.id.sfk;
8344 if (sfk == sfk_destructor)
8351 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8352 tree decl = id_declarator->u.id.unqualified_name;
8355 if (qualifying_scope)
8357 if (at_function_scope_p ())
8361 A declarator-id shall not be qualified except
8364 None of the cases are permitted in block
8366 if (qualifying_scope == global_namespace)
8367 error ("invalid use of qualified-name %<::%D%>",
8369 else if (TYPE_P (qualifying_scope))
8370 error ("invalid use of qualified-name %<%T::%D%>",
8371 qualifying_scope, decl);
8373 error ("invalid use of qualified-name %<%D::%D%>",
8374 qualifying_scope, decl);
8375 return error_mark_node;
8377 else if (TYPE_P (qualifying_scope))
8379 ctype = qualifying_scope;
8380 if (!MAYBE_CLASS_TYPE_P (ctype))
8382 error ("%q#T is not a class or a namespace", ctype);
8385 else if (innermost_code != cdk_function
8386 && current_class_type
8387 && !UNIQUELY_DERIVED_FROM_P (ctype,
8388 current_class_type))
8390 error ("type %qT is not derived from type %qT",
8391 ctype, current_class_type);
8392 return error_mark_node;
8395 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8396 in_namespace = qualifying_scope;
8398 switch (TREE_CODE (decl))
8404 if (innermost_code != cdk_function)
8406 error ("declaration of %qD as non-function", decl);
8407 return error_mark_node;
8409 else if (!qualifying_scope
8410 && !(current_class_type && at_class_scope_p ()))
8412 error ("declaration of %qD as non-member", decl);
8413 return error_mark_node;
8416 type = TREE_OPERAND (decl, 0);
8418 type = constructor_name (type);
8419 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8424 case TEMPLATE_ID_EXPR:
8426 tree fns = TREE_OPERAND (decl, 0);
8429 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8431 gcc_assert (is_overloaded_fn (dname));
8432 dname = DECL_NAME (get_first_fn (dname));
8437 case IDENTIFIER_NODE:
8438 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8441 if (C_IS_RESERVED_WORD (dname))
8443 error ("declarator-id missing; using reserved word %qD",
8445 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8447 else if (!IDENTIFIER_TYPENAME_P (dname))
8448 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8451 gcc_assert (flags == NO_SPECIAL);
8452 flags = TYPENAME_FLAG;
8453 ctor_return_type = TREE_TYPE (dname);
8454 sfk = sfk_conversion;
8455 if (is_typename_at_global_scope (dname))
8456 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8458 name = "<invalid operator>";
8475 return error_mark_node;
8480 if (id_declarator->kind == cdk_id)
8486 The declarator in a function-definition shall have the form
8487 D1 ( parameter-declaration-clause) ... */
8488 if (funcdef_flag && innermost_code != cdk_function)
8490 error ("function definition does not declare parameters");
8491 return error_mark_node;
8494 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8495 && innermost_code != cdk_function
8496 && ! (ctype && !declspecs->any_specifiers_p))
8498 error ("declaration of %qD as non-function", dname);
8499 return error_mark_node;
8502 if (dname && IDENTIFIER_OPNAME_P (dname))
8504 if (declspecs->specs[(int)ds_typedef])
8506 error ("declaration of %qD as %<typedef%>", dname);
8507 return error_mark_node;
8509 else if (decl_context == PARM || decl_context == CATCHPARM)
8511 error ("declaration of %qD as parameter", dname);
8512 return error_mark_node;
8516 /* Anything declared one level down from the top level
8517 must be one of the parameters of a function
8518 (because the body is at least two levels down). */
8520 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8521 by not allowing C++ class definitions to specify their parameters
8522 with xdecls (must be spec.d in the parmlist).
8524 Since we now wait to push a class scope until we are sure that
8525 we are in a legitimate method context, we must set oldcname
8526 explicitly (since current_class_name is not yet alive).
8528 We also want to avoid calling this a PARM if it is in a namespace. */
8530 if (decl_context == NORMAL && !toplevel_bindings_p ())
8532 cp_binding_level *b = current_binding_level;
8533 current_binding_level = b->level_chain;
8534 if (current_binding_level != 0 && toplevel_bindings_p ())
8535 decl_context = PARM;
8536 current_binding_level = b;
8540 name = decl_context == PARM ? "parameter" : "type name";
8542 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8544 error ("%<constexpr%> cannot appear in a typedef declaration");
8545 return error_mark_node;
8548 /* If there were multiple types specified in the decl-specifier-seq,
8549 issue an error message. */
8550 if (declspecs->multiple_types_p)
8552 error ("two or more data types in declaration of %qs", name);
8553 return error_mark_node;
8556 if (declspecs->conflicting_specifiers_p)
8558 error ("conflicting specifiers in declaration of %qs", name);
8559 return error_mark_node;
8562 /* Extract the basic type from the decl-specifier-seq. */
8563 type = declspecs->type;
8564 if (type == error_mark_node)
8567 type_was_error_mark_node = true;
8569 /* If the entire declaration is itself tagged as deprecated then
8570 suppress reports of deprecated items. */
8571 if (type && TREE_DEPRECATED (type)
8572 && deprecated_state != DEPRECATED_SUPPRESS)
8573 warn_deprecated_use (type, NULL_TREE);
8574 if (type && TREE_CODE (type) == TYPE_DECL)
8576 typedef_decl = type;
8577 type = TREE_TYPE (typedef_decl);
8578 if (TREE_DEPRECATED (type)
8579 && DECL_ARTIFICIAL (typedef_decl)
8580 && deprecated_state != DEPRECATED_SUPPRESS)
8581 warn_deprecated_use (type, NULL_TREE);
8583 /* No type at all: default to `int', and set DEFAULTED_INT
8584 because it was not a user-defined typedef. */
8585 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8587 /* These imply 'int'. */
8588 type = integer_type_node;
8592 explicit_int = declspecs->explicit_int_p;
8593 explicit_char = declspecs->explicit_char_p;
8596 /* See the code below that used this. */
8598 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8600 typedef_type = type;
8603 if (sfk != sfk_conversion)
8604 ctor_return_type = ctype;
8606 if (sfk != sfk_none)
8607 type = check_special_function_return_type (sfk, type,
8609 else if (type == NULL_TREE)
8615 /* We handle `main' specially here, because 'main () { }' is so
8616 common. With no options, it is allowed. With -Wreturn-type,
8617 it is a warning. It is only an error with -pedantic-errors. */
8618 is_main = (funcdef_flag
8619 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8620 && MAIN_NAME_P (dname)
8621 && ctype == NULL_TREE
8622 && in_namespace == NULL_TREE
8623 && current_namespace == global_namespace);
8625 if (type_was_error_mark_node)
8626 /* We've already issued an error, don't complain more. */;
8627 else if (in_system_header || flag_ms_extensions)
8628 /* Allow it, sigh. */;
8630 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8632 pedwarn (input_location, OPT_pedantic,
8633 "ISO C++ forbids declaration of %qs with no type", name);
8635 warning (OPT_Wreturn_type,
8636 "ISO C++ forbids declaration of %qs with no type", name);
8638 type = integer_type_node;
8643 /* Now process the modifiers that were specified
8644 and check for invalid combinations. */
8646 /* Long double is a special combination. */
8647 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8650 type = cp_build_qualified_type (long_double_type_node,
8651 cp_type_quals (type));
8654 /* Check all other uses of type modifiers. */
8656 if (unsigned_p || signed_p || long_p || short_p)
8660 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8661 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8662 else if (signed_p && unsigned_p)
8663 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8664 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8665 error ("%<long long%> invalid for %qs", name);
8666 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8667 error ("%<__int128%> invalid for %qs", name);
8668 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8669 error ("%<long%> invalid for %qs", name);
8670 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8671 error ("%<short%> invalid for %qs", name);
8672 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8673 error ("%<long%> or %<short%> invalid for %qs", name);
8674 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8675 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8676 else if ((long_p || short_p) && explicit_char)
8677 error ("%<long%> or %<short%> specified with char for %qs", name);
8678 else if (long_p && short_p)
8679 error ("%<long%> and %<short%> specified together for %qs", name);
8680 else if (type == char16_type_node || type == char32_type_node)
8682 if (signed_p || unsigned_p)
8683 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8684 else if (short_p || long_p)
8685 error ("%<short%> or %<long%> invalid for %qs", name);
8690 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8692 pedwarn (input_location, OPT_pedantic,
8693 "long, short, signed or unsigned used invalidly for %qs",
8695 if (flag_pedantic_errors)
8698 if (explicit_int128)
8700 if (int128_integer_type_node == NULL_TREE)
8702 error ("%<__int128%> is not supported by this target");
8707 pedwarn (input_location, OPT_pedantic,
8708 "ISO C++ does not support %<__int128%> for %qs",
8710 if (flag_pedantic_errors)
8716 /* Discard the type modifiers if they are invalid. */
8724 explicit_int128 = false;
8728 /* Decide whether an integer type is signed or not.
8729 Optionally treat bitfields as signed by default. */
8733 It is implementation-defined whether a plain (neither
8734 explicitly signed or unsigned) char, short, int, or long
8735 bit-field is signed or unsigned.
8737 Naturally, we extend this to long long as well. Note that
8738 this does not include wchar_t. */
8739 || (bitfield && !flag_signed_bitfields
8741 /* A typedef for plain `int' without `signed' can be
8742 controlled just like plain `int', but a typedef for
8743 `signed int' cannot be so controlled. */
8745 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8746 && TREE_CODE (type) == INTEGER_TYPE
8747 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8749 if (explicit_int128)
8750 type = int128_unsigned_type_node;
8752 type = long_long_unsigned_type_node;
8754 type = long_unsigned_type_node;
8756 type = short_unsigned_type_node;
8757 else if (type == char_type_node)
8758 type = unsigned_char_type_node;
8759 else if (typedef_decl)
8760 type = unsigned_type_for (type);
8762 type = unsigned_type_node;
8764 else if (signed_p && type == char_type_node)
8765 type = signed_char_type_node;
8766 else if (explicit_int128)
8767 type = int128_integer_type_node;
8769 type = long_long_integer_type_node;
8771 type = long_integer_type_node;
8773 type = short_integer_type_node;
8775 if (declspecs->specs[(int)ds_complex])
8777 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8778 error ("complex invalid for %qs", name);
8779 /* If we just have "complex", it is equivalent to
8780 "complex double", but if any modifiers at all are specified it is
8781 the complex form of TYPE. E.g, "complex short" is
8782 "complex short int". */
8783 else if (defaulted_int && ! longlong && ! explicit_int128
8784 && ! (long_p || short_p || signed_p || unsigned_p))
8785 type = complex_double_type_node;
8786 else if (type == integer_type_node)
8787 type = complex_integer_type_node;
8788 else if (type == float_type_node)
8789 type = complex_float_type_node;
8790 else if (type == double_type_node)
8791 type = complex_double_type_node;
8792 else if (type == long_double_type_node)
8793 type = complex_long_double_type_node;
8795 type = build_complex_type (type);
8798 type_quals = TYPE_UNQUALIFIED;
8799 if (declspecs->specs[(int)ds_const])
8800 type_quals |= TYPE_QUAL_CONST;
8801 if (declspecs->specs[(int)ds_volatile])
8802 type_quals |= TYPE_QUAL_VOLATILE;
8803 if (declspecs->specs[(int)ds_restrict])
8804 type_quals |= TYPE_QUAL_RESTRICT;
8805 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8806 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8809 type_quals |= cp_type_quals (type);
8810 type = cp_build_qualified_type_real
8811 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8812 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8813 /* We might have ignored or rejected some of the qualifiers. */
8814 type_quals = cp_type_quals (type);
8817 inlinep = !! declspecs->specs[(int)ds_inline];
8818 virtualp = !! declspecs->specs[(int)ds_virtual];
8819 explicitp = !! declspecs->specs[(int)ds_explicit];
8821 storage_class = declspecs->storage_class;
8822 if (storage_class == sc_static)
8823 staticp = 1 + (decl_context == FIELD);
8825 if (virtualp && staticp == 2)
8827 error ("member %qD cannot be declared both virtual and static", dname);
8828 storage_class = sc_none;
8831 friendp = !! declspecs->specs[(int)ds_friend];
8833 if (dependent_name && !friendp)
8835 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8836 return error_mark_node;
8839 /* Issue errors about use of storage classes for parameters. */
8840 if (decl_context == PARM)
8842 if (declspecs->specs[(int)ds_typedef])
8844 error ("typedef declaration invalid in parameter declaration");
8845 return error_mark_node;
8847 else if (template_parm_flag && storage_class != sc_none)
8849 error ("storage class specified for template parameter %qs", name);
8850 return error_mark_node;
8852 else if (storage_class == sc_static
8853 || storage_class == sc_extern
8855 error ("storage class specifiers invalid in parameter declarations");
8857 /* Function parameters cannot be constexpr. If we saw one, moan
8858 and pretend it wasn't there. */
8861 error ("a parameter cannot be declared %<constexpr%>");
8866 /* Give error if `virtual' is used outside of class declaration. */
8868 && (current_class_name == NULL_TREE || decl_context != FIELD))
8870 error ("%<virtual%> outside class declaration");
8874 /* Static anonymous unions are dealt with here. */
8875 if (staticp && decl_context == TYPENAME
8877 && ANON_AGGR_TYPE_P (declspecs->type))
8878 decl_context = FIELD;
8880 /* Warn about storage classes that are invalid for certain
8881 kinds of declarations (parameters, typenames, etc.). */
8884 && storage_class != sc_extern
8885 && storage_class != sc_static)
8886 || declspecs->specs[(int)ds_typedef]))
8888 error ("multiple storage classes in declaration of %qs", name);
8891 if (decl_context != NORMAL
8892 && ((storage_class != sc_none
8893 && storage_class != sc_mutable)
8896 if ((decl_context == PARM || decl_context == CATCHPARM)
8897 && (storage_class == sc_register
8898 || storage_class == sc_auto))
8900 else if (declspecs->specs[(int)ds_typedef])
8902 else if (decl_context == FIELD
8903 /* C++ allows static class elements. */
8904 && storage_class == sc_static)
8905 /* C++ also allows inlines and signed and unsigned elements,
8906 but in those cases we don't come in here. */
8910 if (decl_context == FIELD)
8911 error ("storage class specified for %qs", name);
8914 if (decl_context == PARM || decl_context == CATCHPARM)
8915 error ("storage class specified for parameter %qs", name);
8917 error ("storage class specified for typename");
8919 if (storage_class == sc_register
8920 || storage_class == sc_auto
8921 || storage_class == sc_extern
8923 storage_class = sc_none;
8926 else if (storage_class == sc_extern && funcdef_flag
8927 && ! toplevel_bindings_p ())
8928 error ("nested function %qs declared %<extern%>", name);
8929 else if (toplevel_bindings_p ())
8931 if (storage_class == sc_auto)
8932 error ("top-level declaration of %qs specifies %<auto%>", name);
8935 && storage_class != sc_extern
8936 && storage_class != sc_static)
8938 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8943 if (storage_class && friendp)
8945 error ("storage class specifiers invalid in friend function declarations");
8946 storage_class = sc_none;
8951 unqualified_id = NULL_TREE;
8954 unqualified_id = id_declarator->u.id.unqualified_name;
8955 switch (TREE_CODE (unqualified_id))
8958 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8959 if (TYPE_P (unqualified_id))
8960 unqualified_id = constructor_name (unqualified_id);
8963 case IDENTIFIER_NODE:
8964 case TEMPLATE_ID_EXPR:
8972 /* Determine the type of the entity declared by recurring on the
8974 for (; declarator; declarator = declarator->declarator)
8976 const cp_declarator *inner_declarator;
8979 if (type == error_mark_node)
8980 return error_mark_node;
8982 attrs = declarator->attributes;
8988 if (declarator == NULL || declarator->kind == cdk_id)
8989 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8990 if (declarator->kind == cdk_function)
8991 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8992 if (declarator->kind == cdk_array)
8993 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8994 returned_attrs = decl_attributes (&type,
8995 chainon (returned_attrs, attrs),
8999 if (declarator->kind == cdk_id)
9002 inner_declarator = declarator->declarator;
9004 switch (declarator->kind)
9007 type = create_array_type_for_decl (dname, type,
9008 declarator->u.array.bounds);
9016 /* Declaring a function type.
9017 Make sure we have a valid type for the function to return. */
9019 if (type_quals != TYPE_UNQUALIFIED)
9021 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9022 warning (OPT_Wignored_qualifiers,
9023 "type qualifiers ignored on function return type");
9024 /* We now know that the TYPE_QUALS don't apply to the
9025 decl, but to its return type. */
9026 type_quals = TYPE_UNQUALIFIED;
9028 errmsg = targetm.invalid_return_type (type);
9032 type = integer_type_node;
9035 /* Error about some types functions can't return. */
9037 if (TREE_CODE (type) == FUNCTION_TYPE)
9039 error ("%qs declared as function returning a function", name);
9040 return error_mark_node;
9042 if (TREE_CODE (type) == ARRAY_TYPE)
9044 error ("%qs declared as function returning an array", name);
9045 return error_mark_node;
9048 /* Pick up type qualifiers which should be applied to `this'. */
9049 memfn_quals = declarator->u.function.qualifiers;
9050 /* Pick up virt-specifiers. */
9051 virt_specifiers = declarator->u.function.virt_specifiers;
9052 /* Pick up the exception specifications. */
9053 raises = declarator->u.function.exception_specification;
9054 /* If the exception-specification is ill-formed, let's pretend
9055 there wasn't one. */
9056 if (raises == error_mark_node)
9059 /* Say it's a definition only for the CALL_EXPR
9060 closest to the identifier. */
9061 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9063 /* Handle a late-specified return type. */
9066 if (type_uses_auto (type))
9068 if (!declarator->u.function.late_return_type)
9070 error ("%qs function uses %<auto%> type specifier without"
9071 " late return type", name);
9072 return error_mark_node;
9074 else if (!is_auto (type))
9076 error ("%qs function with late return type has"
9077 " %qT as its type rather than plain %<auto%>",
9079 return error_mark_node;
9082 else if (declarator->u.function.late_return_type)
9084 error ("%qs function with late return type not declared"
9085 " with %<auto%> type specifier", name);
9086 return error_mark_node;
9089 type = splice_late_return_type
9090 (type, declarator->u.function.late_return_type);
9091 if (type == error_mark_node)
9092 return error_mark_node;
9094 if (ctype == NULL_TREE
9095 && decl_context == FIELD
9097 && (friendp == 0 || dname == current_class_name))
9098 ctype = current_class_type;
9100 if (ctype && (sfk == sfk_constructor
9101 || sfk == sfk_destructor))
9103 /* We are within a class's scope. If our declarator name
9104 is the same as the class name, and we are defining
9105 a function, then it is a constructor/destructor, and
9106 therefore returns a void type. */
9108 /* ISO C++ 12.4/2. A destructor may not be declared
9109 const or volatile. A destructor may not be
9112 ISO C++ 12.1. A constructor may not be declared
9113 const or volatile. A constructor may not be
9114 virtual. A constructor may not be static. */
9116 error ((flags == DTOR_FLAG)
9117 ? "destructor cannot be static member function"
9118 : "constructor cannot be static member function");
9121 error ((flags == DTOR_FLAG)
9122 ? "destructors may not be cv-qualified"
9123 : "constructors may not be cv-qualified");
9124 memfn_quals = TYPE_UNQUALIFIED;
9127 if (decl_context == FIELD
9128 && !member_function_or_else (ctype,
9131 return error_mark_node;
9133 if (flags != DTOR_FLAG)
9135 /* It's a constructor. */
9140 permerror (input_location, "constructors cannot be declared virtual");
9143 if (decl_context == FIELD
9144 && sfk != sfk_constructor)
9145 return error_mark_node;
9147 if (decl_context == FIELD)
9153 error ("can%'t initialize friend function %qs", name);
9156 /* Cannot be both friend and virtual. */
9157 error ("virtual functions cannot be friends");
9160 if (decl_context == NORMAL)
9161 error ("friend declaration not in class definition");
9162 if (current_function_decl && funcdef_flag)
9163 error ("can%'t define friend function %qs in a local "
9167 else if (ctype && sfk == sfk_conversion)
9171 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9176 arg_types = grokparms (declarator->u.function.parameters,
9179 if (inner_declarator
9180 && inner_declarator->kind == cdk_id
9181 && inner_declarator->u.id.sfk == sfk_destructor
9182 && arg_types != void_list_node)
9184 error ("destructors may not have parameters");
9185 arg_types = void_list_node;
9189 type = build_function_type (type, arg_types);
9196 /* Filter out pointers-to-references and references-to-references.
9197 We can get these if a TYPE_DECL is used. */
9199 if (TREE_CODE (type) == REFERENCE_TYPE)
9201 if (declarator->kind != cdk_reference)
9203 error ("cannot declare pointer to %q#T", type);
9204 type = TREE_TYPE (type);
9207 /* In C++0x, we allow reference to reference declarations
9208 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9209 and template type arguments [14.3.1/4 temp.arg.type]. The
9210 check for direct reference to reference declarations, which
9211 are still forbidden, occurs below. Reasoning behind the change
9212 can be found in DR106, DR540, and the rvalue reference
9214 else if (cxx_dialect == cxx98)
9216 error ("cannot declare reference to %q#T", type);
9217 type = TREE_TYPE (type);
9220 else if (VOID_TYPE_P (type))
9222 if (declarator->kind == cdk_reference)
9223 error ("cannot declare reference to %q#T", type);
9224 else if (declarator->kind == cdk_ptrmem)
9225 error ("cannot declare pointer to %q#T member", type);
9228 /* We now know that the TYPE_QUALS don't apply to the decl,
9229 but to the target of the pointer. */
9230 type_quals = TYPE_UNQUALIFIED;
9232 if (declarator->kind == cdk_ptrmem
9233 && (TREE_CODE (type) == FUNCTION_TYPE
9234 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9236 memfn_quals |= type_memfn_quals (type);
9237 type = build_memfn_type (type,
9238 declarator->u.pointer.class_type,
9240 if (type == error_mark_node)
9241 return error_mark_node;
9242 memfn_quals = TYPE_UNQUALIFIED;
9245 if (TREE_CODE (type) == FUNCTION_TYPE
9246 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9247 error (declarator->kind == cdk_reference
9248 ? G_("cannot declare reference to qualified function type %qT")
9249 : G_("cannot declare pointer to qualified function type %qT"),
9252 /* When the pointed-to type involves components of variable size,
9253 care must be taken to ensure that the size evaluation code is
9254 emitted early enough to dominate all the possible later uses
9255 and late enough for the variables on which it depends to have
9258 This is expected to happen automatically when the pointed-to
9259 type has a name/declaration of it's own, but special attention
9260 is required if the type is anonymous.
9262 We handle the NORMAL and FIELD contexts here by inserting a
9263 dummy statement that just evaluates the size at a safe point
9264 and ensures it is not deferred until e.g. within a deeper
9265 conditional context (c++/43555).
9267 We expect nothing to be needed here for PARM or TYPENAME.
9268 Evaluating the size at this point for TYPENAME would
9269 actually be incorrect, as we might be in the middle of an
9270 expression with side effects on the pointed-to type size
9271 "arguments" prior to the pointer declaration point and the
9272 size evaluation could end up prior to the side effects. */
9274 if (!TYPE_NAME (type)
9275 && (decl_context == NORMAL || decl_context == FIELD)
9276 && at_function_scope_p ()
9277 && variably_modified_type_p (type, NULL_TREE))
9279 /* First break out any side-effects. */
9280 stabilize_vla_size (TYPE_SIZE (type));
9281 /* And then force evaluation of the SAVE_EXPR. */
9282 finish_expr_stmt (TYPE_SIZE (type));
9285 if (declarator->kind == cdk_reference)
9287 /* In C++0x, the type we are creating a reference to might be
9288 a typedef which is itself a reference type. In that case,
9289 we follow the reference collapsing rules in
9290 [7.1.3/8 dcl.typedef] to create the final reference type:
9292 "If a typedef TD names a type that is a reference to a type
9293 T, an attempt to create the type 'lvalue reference to cv TD'
9294 creates the type 'lvalue reference to T,' while an attempt
9295 to create the type "rvalue reference to cv TD' creates the
9298 if (VOID_TYPE_P (type))
9299 /* We already gave an error. */;
9300 else if (TREE_CODE (type) == REFERENCE_TYPE)
9302 if (declarator->u.reference.rvalue_ref)
9303 /* Leave type alone. */;
9305 type = cp_build_reference_type (TREE_TYPE (type), false);
9308 type = cp_build_reference_type
9309 (type, declarator->u.reference.rvalue_ref);
9311 /* In C++0x, we need this check for direct reference to
9312 reference declarations, which are forbidden by
9313 [8.3.2/5 dcl.ref]. Reference to reference declarations
9314 are only allowed indirectly through typedefs and template
9315 type arguments. Example:
9317 void foo(int & &); // invalid ref-to-ref decl
9319 typedef int & int_ref;
9320 void foo(int_ref &); // valid ref-to-ref decl
9322 if (inner_declarator && inner_declarator->kind == cdk_reference)
9323 error ("cannot declare reference to %q#T, which is not "
9324 "a typedef or a template type argument", type);
9326 else if (TREE_CODE (type) == METHOD_TYPE)
9327 type = build_ptrmemfunc_type (build_pointer_type (type));
9328 else if (declarator->kind == cdk_ptrmem)
9330 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9332 if (declarator->u.pointer.class_type == error_mark_node)
9333 /* We will already have complained. */
9334 type = error_mark_node;
9336 type = build_ptrmem_type (declarator->u.pointer.class_type,
9340 type = build_pointer_type (type);
9342 /* Process a list of type modifier keywords (such as
9343 const or volatile) that were given inside the `*' or `&'. */
9345 if (declarator->u.pointer.qualifiers)
9348 = cp_build_qualified_type (type,
9349 declarator->u.pointer.qualifiers);
9350 type_quals = cp_type_quals (type);
9363 /* We need to stabilize side-effects in VLA sizes for regular array
9364 declarations too, not just pointers to arrays. */
9365 if (type != error_mark_node && !TYPE_NAME (type)
9366 && (decl_context == NORMAL || decl_context == FIELD)
9367 && at_function_scope_p ()
9368 && variably_modified_type_p (type, NULL_TREE))
9369 stabilize_vla_size (TYPE_SIZE (type));
9371 /* A `constexpr' specifier used in an object declaration declares
9372 the object as `const'. */
9373 if (constexpr_p && innermost_code != cdk_function)
9375 if (type_quals & TYPE_QUAL_CONST)
9376 error ("both %<const%> and %<constexpr%> cannot be used here");
9377 if (type_quals & TYPE_QUAL_VOLATILE)
9378 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9379 if (TREE_CODE (type) != REFERENCE_TYPE)
9381 type_quals |= TYPE_QUAL_CONST;
9382 type = cp_build_qualified_type (type, type_quals);
9386 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9387 && TREE_CODE (type) != FUNCTION_TYPE
9388 && TREE_CODE (type) != METHOD_TYPE)
9390 error ("template-id %qD used as a declarator",
9392 unqualified_id = dname;
9395 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9396 qualified with a class-name, turn it into a METHOD_TYPE, unless
9397 we know that the function is static. We take advantage of this
9398 opportunity to do other processing that pertains to entities
9399 explicitly declared to be class members. Note that if DECLARATOR
9400 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9401 would not have exited the loop above. */
9403 && declarator->u.id.qualifying_scope
9404 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9408 ctype = declarator->u.id.qualifying_scope;
9409 ctype = TYPE_MAIN_VARIANT (ctype);
9411 while (t != NULL_TREE && CLASS_TYPE_P (t))
9413 /* You're supposed to have one `template <...>' for every
9414 template class, but you don't need one for a full
9415 specialization. For example:
9417 template <class T> struct S{};
9418 template <> struct S<int> { void f(); };
9419 void S<int>::f () {}
9421 is correct; there shouldn't be a `template <>' for the
9422 definition of `S<int>::f'. */
9423 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9424 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9425 /* T is an explicit (not partial) specialization. All
9426 containing classes must therefore also be explicitly
9429 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9430 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9431 template_count += 1;
9433 t = TYPE_MAIN_DECL (t);
9434 t = DECL_CONTEXT (t);
9437 if (ctype == current_class_type)
9441 permerror (input_location, "member functions are implicitly friends of their class");
9445 permerror (declarator->id_loc,
9446 "extra qualification %<%T::%> on member %qs",
9449 else if (/* If the qualifying type is already complete, then we
9450 can skip the following checks. */
9451 !COMPLETE_TYPE_P (ctype)
9452 && (/* If the function is being defined, then
9453 qualifying type must certainly be complete. */
9455 /* A friend declaration of "T::f" is OK, even if
9456 "T" is a template parameter. But, if this
9457 function is not a friend, the qualifying type
9459 || (!friendp && !CLASS_TYPE_P (ctype))
9460 /* For a declaration, the type need not be
9461 complete, if either it is dependent (since there
9462 is no meaningful definition of complete in that
9463 case) or the qualifying class is currently being
9465 || !(dependent_type_p (ctype)
9466 || currently_open_class (ctype)))
9467 /* Check that the qualifying type is complete. */
9468 && !complete_type_or_else (ctype, NULL_TREE))
9469 return error_mark_node;
9470 else if (TREE_CODE (type) == FUNCTION_TYPE)
9472 if (current_class_type
9473 && (!friendp || funcdef_flag))
9476 ? "cannot define member function %<%T::%s%> within %<%T%>"
9477 : "cannot declare member function %<%T::%s%> within %<%T%>",
9478 ctype, name, current_class_type);
9479 return error_mark_node;
9482 else if (declspecs->specs[(int)ds_typedef]
9483 && current_class_type)
9485 error ("cannot declare member %<%T::%s%> within %qT",
9486 ctype, name, current_class_type);
9487 return error_mark_node;
9491 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9492 ctype = current_class_type;
9494 /* Now TYPE has the actual type. */
9499 *attrlist = chainon (returned_attrs, *attrlist);
9501 attrlist = &returned_attrs;
9504 /* Handle parameter packs. */
9505 if (parameter_pack_p)
9507 if (decl_context == PARM)
9508 /* Turn the type into a pack expansion.*/
9509 type = make_pack_expansion (type);
9511 error ("non-parameter %qs cannot be a parameter pack", name);
9514 /* Did array size calculations overflow? */
9516 if (TREE_CODE (type) == ARRAY_TYPE
9517 && COMPLETE_TYPE_P (type)
9518 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9519 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9521 error ("size of array %qs is too large", name);
9522 /* If we proceed with the array type as it is, we'll eventually
9523 crash in tree_low_cst(). */
9524 type = error_mark_node;
9527 if ((decl_context == FIELD || decl_context == PARM)
9528 && !processing_template_decl
9529 && variably_modified_type_p (type, NULL_TREE))
9531 if (decl_context == FIELD)
9532 error ("data member may not have variably modified type %qT", type);
9534 error ("parameter may not have variably modified type %qT", type);
9535 type = error_mark_node;
9538 if (explicitp == 1 || (explicitp && friendp))
9540 /* [dcl.fct.spec] The explicit specifier shall only be used in
9541 declarations of constructors within a class definition. */
9542 error ("only declarations of constructors can be %<explicit%>");
9546 if (storage_class == sc_mutable)
9548 if (decl_context != FIELD || friendp)
9550 error ("non-member %qs cannot be declared %<mutable%>", name);
9551 storage_class = sc_none;
9553 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9555 error ("non-object member %qs cannot be declared %<mutable%>", name);
9556 storage_class = sc_none;
9558 else if (TREE_CODE (type) == FUNCTION_TYPE
9559 || TREE_CODE (type) == METHOD_TYPE)
9561 error ("function %qs cannot be declared %<mutable%>", name);
9562 storage_class = sc_none;
9566 error ("static %qs cannot be declared %<mutable%>", name);
9567 storage_class = sc_none;
9569 else if (type_quals & TYPE_QUAL_CONST)
9571 error ("const %qs cannot be declared %<mutable%>", name);
9572 storage_class = sc_none;
9574 else if (TREE_CODE (type) == REFERENCE_TYPE)
9576 permerror (input_location, "reference %qs cannot be declared "
9577 "%<mutable%>", name);
9578 storage_class = sc_none;
9582 /* If this is declaring a typedef name, return a TYPE_DECL. */
9583 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9587 /* Note that the grammar rejects storage classes
9588 in typenames, fields or parameters. */
9589 if (current_lang_name == lang_name_java)
9590 TYPE_FOR_JAVA (type) = 1;
9592 /* This declaration:
9594 typedef void f(int) const;
9596 declares a function type which is not a member of any
9597 particular class, but which is cv-qualified; for
9598 example "f S::*" declares a pointer to a const-qualified
9599 member function of S. We record the cv-qualification in the
9601 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9603 type = apply_memfn_quals (type, memfn_quals);
9605 /* We have now dealt with these qualifiers. */
9606 memfn_quals = TYPE_UNQUALIFIED;
9609 if (type_uses_auto (type))
9611 error ("typedef declared %<auto%>");
9612 type = error_mark_node;
9615 if (decl_context == FIELD)
9616 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9618 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9619 if (id_declarator && declarator->u.id.qualifying_scope) {
9620 error_at (DECL_SOURCE_LOCATION (decl),
9621 "typedef name may not be a nested-name-specifier");
9622 TREE_TYPE (decl) = error_mark_node;
9625 if (decl_context != FIELD)
9627 if (!current_function_decl)
9628 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9629 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9630 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9631 (current_function_decl)))
9632 /* The TYPE_DECL is "abstract" because there will be
9633 clones of this constructor/destructor, and there will
9634 be copies of this TYPE_DECL generated in those
9636 DECL_ABSTRACT (decl) = 1;
9638 else if (constructor_name_p (unqualified_id, current_class_type))
9639 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9640 "as enclosing class",
9643 /* If the user declares "typedef struct {...} foo" then the
9644 struct will have an anonymous name. Fill that name in now.
9645 Nothing can refer to it, so nothing needs know about the name
9647 if (type != error_mark_node
9650 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9651 && TYPE_ANONYMOUS_P (type)
9652 && declspecs->type_definition_p
9653 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9657 /* Replace the anonymous name with the real name everywhere. */
9658 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9660 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9661 /* We do not rename the debug info representing the
9662 anonymous tagged type because the standard says in
9663 [dcl.typedef] that the naming applies only for
9664 linkage purposes. */
9665 /*debug_hooks->set_name (t, decl);*/
9666 TYPE_NAME (t) = decl;
9669 if (TYPE_LANG_SPECIFIC (type))
9670 TYPE_WAS_ANONYMOUS (type) = 1;
9672 /* If this is a typedef within a template class, the nested
9673 type is a (non-primary) template. The name for the
9674 template needs updating as well. */
9675 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9676 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9677 = TYPE_IDENTIFIER (type);
9679 /* Adjust linkage now that we aren't anonymous anymore. */
9680 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9681 determine_visibility (TYPE_MAIN_DECL (type));
9683 /* FIXME remangle member functions; member functions of a
9684 type with external linkage have external linkage. */
9688 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9689 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9691 bad_specifiers (decl, BSP_TYPE, virtualp,
9692 memfn_quals != TYPE_UNQUALIFIED,
9693 inlinep, friendp, raises != NULL_TREE);
9698 /* Detect the case of an array type of unspecified size
9699 which came, as such, direct from a typedef name.
9700 We must copy the type, so that the array's domain can be
9701 individually set by the object's initializer. */
9703 if (type && typedef_type
9704 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9705 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9706 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9708 /* Detect where we're using a typedef of function type to declare a
9709 function. PARMS will not be set, so we must create it now. */
9711 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9713 tree decls = NULL_TREE;
9716 for (args = TYPE_ARG_TYPES (type);
9717 args && args != void_list_node;
9718 args = TREE_CHAIN (args))
9720 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9722 DECL_CHAIN (decl) = decls;
9726 parms = nreverse (decls);
9728 if (decl_context != TYPENAME)
9730 /* A cv-qualifier-seq shall only be part of the function type
9731 for a non-static member function. [8.3.5/4 dcl.fct] */
9732 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9733 && (current_class_type == NULL_TREE || staticp) )
9736 ? G_("qualified function types cannot be used to "
9737 "declare static member functions")
9738 : G_("qualified function types cannot be used to "
9739 "declare free functions"));
9740 type = TYPE_MAIN_VARIANT (type);
9743 /* The qualifiers on the function type become the qualifiers on
9744 the non-static member function. */
9745 memfn_quals |= type_memfn_quals (type);
9746 type_quals = TYPE_UNQUALIFIED;
9750 /* If this is a type name (such as, in a cast or sizeof),
9751 compute the type and return it now. */
9753 if (decl_context == TYPENAME)
9755 /* Note that the grammar rejects storage classes
9756 in typenames, fields or parameters. */
9757 if (type_quals != TYPE_UNQUALIFIED)
9758 type_quals = TYPE_UNQUALIFIED;
9760 /* Special case: "friend class foo" looks like a TYPENAME context. */
9763 if (type_quals != TYPE_UNQUALIFIED)
9765 error ("type qualifiers specified for friend class declaration");
9766 type_quals = TYPE_UNQUALIFIED;
9770 error ("%<inline%> specified for friend class declaration");
9776 /* Don't allow friend declaration without a class-key. */
9777 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9778 permerror (input_location, "template parameters cannot be friends");
9779 else if (TREE_CODE (type) == TYPENAME_TYPE)
9780 permerror (input_location, "friend declaration requires class-key, "
9781 "i.e. %<friend class %T::%D%>",
9782 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9784 permerror (input_location, "friend declaration requires class-key, "
9785 "i.e. %<friend %#T%>",
9789 /* Only try to do this stuff if we didn't already give up. */
9790 if (type != integer_type_node)
9792 /* A friendly class? */
9793 if (current_class_type)
9794 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9797 error ("trying to make class %qT a friend of global scope",
9800 type = void_type_node;
9803 else if (memfn_quals)
9805 if (ctype == NULL_TREE
9806 && TREE_CODE (type) == METHOD_TYPE)
9807 ctype = TYPE_METHOD_BASETYPE (type);
9810 type = build_memfn_type (type, ctype, memfn_quals);
9811 /* Core issue #547: need to allow this in template type args. */
9812 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9813 type = apply_memfn_quals (type, memfn_quals);
9815 error ("invalid qualifiers on non-member function type");
9820 else if (unqualified_id == NULL_TREE && decl_context != PARM
9821 && decl_context != CATCHPARM
9822 && TREE_CODE (type) != UNION_TYPE
9825 error ("abstract declarator %qT used as declaration", type);
9826 return error_mark_node;
9829 /* Only functions may be declared using an operator-function-id. */
9831 && IDENTIFIER_OPNAME_P (unqualified_id)
9832 && TREE_CODE (type) != FUNCTION_TYPE
9833 && TREE_CODE (type) != METHOD_TYPE)
9835 error ("declaration of %qD as non-function", unqualified_id);
9836 return error_mark_node;
9839 /* We don't check parameter types here because we can emit a better
9840 error message later. */
9841 if (decl_context != PARM)
9843 type = check_var_type (unqualified_id, type);
9844 if (type == error_mark_node)
9845 return error_mark_node;
9848 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9849 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9851 if (decl_context == PARM || decl_context == CATCHPARM)
9853 if (ctype || in_namespace)
9854 error ("cannot use %<::%> in parameter declaration");
9856 if (type_uses_auto (type))
9858 error ("parameter declared %<auto%>");
9859 type = error_mark_node;
9862 /* A parameter declared as an array of T is really a pointer to T.
9863 One declared as a function is really a pointer to a function.
9864 One declared as a member is really a pointer to member. */
9866 if (TREE_CODE (type) == ARRAY_TYPE)
9868 /* Transfer const-ness of array into that of type pointed to. */
9869 type = build_pointer_type (TREE_TYPE (type));
9870 type_quals = TYPE_UNQUALIFIED;
9872 else if (TREE_CODE (type) == FUNCTION_TYPE)
9873 type = build_pointer_type (type);
9876 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9877 && !NEW_DELETE_OPNAME_P (unqualified_id))
9879 cp_cv_quals real_quals = memfn_quals;
9880 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9881 real_quals |= TYPE_QUAL_CONST;
9882 type = build_memfn_type (type, ctype, real_quals);
9888 if (decl_context == PARM)
9890 decl = cp_build_parm_decl (unqualified_id, type);
9892 bad_specifiers (decl, BSP_PARM, virtualp,
9893 memfn_quals != TYPE_UNQUALIFIED,
9894 inlinep, friendp, raises != NULL_TREE);
9896 else if (decl_context == FIELD)
9898 /* The C99 flexible array extension. */
9899 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9900 && TYPE_DOMAIN (type) == NULL_TREE)
9902 tree itype = compute_array_index_type (dname, integer_zero_node,
9903 tf_warning_or_error);
9904 type = build_cplus_array_type (TREE_TYPE (type), itype);
9907 if (type == error_mark_node)
9909 /* Happens when declaring arrays of sizes which
9910 are error_mark_node, for example. */
9913 else if (in_namespace && !friendp)
9915 /* Something like struct S { int N::j; }; */
9916 error ("invalid use of %<::%>");
9917 return error_mark_node;
9919 else if (TREE_CODE (type) == FUNCTION_TYPE
9920 || TREE_CODE (type) == METHOD_TYPE)
9923 tree function_context;
9927 /* This should never happen in pure C++ (the check
9928 could be an assert). It could happen in
9929 Objective-C++ if someone writes invalid code that
9930 uses a function declaration for an instance
9931 variable or property (instance variables and
9932 properties are parsed as FIELD_DECLs, but they are
9933 part of an Objective-C class, not a C++ class).
9934 That code is invalid and is caught by this
9938 error ("declaration of function %qD in invalid context",
9940 return error_mark_node;
9943 /* ``A union may [ ... ] not [ have ] virtual functions.''
9945 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9947 error ("function %qD declared virtual inside a union",
9949 return error_mark_node;
9952 if (NEW_DELETE_OPNAME_P (unqualified_id))
9956 error ("%qD cannot be declared virtual, since it "
9964 /* Check that the name used for a destructor makes sense. */
9965 if (sfk == sfk_destructor)
9967 tree uqname = id_declarator->u.id.unqualified_name;
9971 gcc_assert (friendp);
9972 error ("expected qualified name in friend declaration "
9973 "for destructor %qD", uqname);
9974 return error_mark_node;
9977 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9979 error ("declaration of %qD as member of %qT",
9981 return error_mark_node;
9985 error ("a destructor cannot be %<constexpr%>");
9986 return error_mark_node;
9989 else if (sfk == sfk_constructor && friendp && !ctype)
9991 error ("expected qualified name in friend declaration "
9992 "for constructor %qD",
9993 id_declarator->u.id.unqualified_name);
9994 return error_mark_node;
9997 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9998 function_context = (ctype != NULL_TREE) ?
9999 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10000 publicp = (! friendp || ! staticp)
10001 && function_context == NULL_TREE;
10002 decl = grokfndecl (ctype, type,
10003 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10004 ? unqualified_id : dname,
10007 virtualp, flags, memfn_quals, raises,
10008 friendp ? -1 : 0, friendp, publicp,
10009 inlinep | (2 * constexpr_p),
10011 funcdef_flag, template_count, in_namespace,
10012 attrlist, declarator->id_loc);
10013 decl = set_virt_specifiers (decl, virt_specifiers);
10014 if (decl == NULL_TREE)
10015 return error_mark_node;
10017 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10018 /* The decl and setting of decl_attr is also turned off. */
10019 decl = build_decl_attribute_variant (decl, decl_attr);
10022 /* [class.conv.ctor]
10024 A constructor declared without the function-specifier
10025 explicit that can be called with a single parameter
10026 specifies a conversion from the type of its first
10027 parameter to the type of its class. Such a constructor
10028 is called a converting constructor. */
10029 if (explicitp == 2)
10030 DECL_NONCONVERTING_P (decl) = 1;
10032 else if (!staticp && !dependent_type_p (type)
10033 && !COMPLETE_TYPE_P (complete_type (type))
10034 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10036 if (unqualified_id)
10037 error ("field %qD has incomplete type", unqualified_id);
10039 error ("name %qT has incomplete type", type);
10041 /* If we're instantiating a template, tell them which
10042 instantiation made the field's type be incomplete. */
10043 if (current_class_type
10044 && TYPE_NAME (current_class_type)
10045 && IDENTIFIER_TEMPLATE (current_class_name)
10047 && declspecs->type == type)
10048 error (" in instantiation of template %qT",
10049 current_class_type);
10051 return error_mark_node;
10057 error ("%qE is neither function nor member function; "
10058 "cannot be declared friend", unqualified_id);
10066 /* Friends are treated specially. */
10067 if (ctype == current_class_type)
10068 ; /* We already issued a permerror. */
10069 else if (decl && DECL_NAME (decl))
10071 if (template_class_depth (current_class_type) == 0)
10073 decl = check_explicit_specialization
10074 (unqualified_id, decl, template_count,
10075 2 * funcdef_flag + 4);
10076 if (decl == error_mark_node)
10077 return error_mark_node;
10080 decl = do_friend (ctype, unqualified_id, decl,
10086 return error_mark_node;
10089 /* Structure field. It may not be a function, except for C++. */
10091 if (decl == NULL_TREE)
10097 /* An attempt is being made to initialize a non-static
10098 member. But, from [class.mem]:
10100 4 A member-declarator can contain a
10101 constant-initializer only if it declares a static
10102 member (_class.static_) of integral or enumeration
10103 type, see _class.static.data_.
10105 This used to be relatively common practice, but
10106 the rest of the compiler does not correctly
10107 handle the initialization unless the member is
10108 static so we make it static below. */
10109 if (cxx_dialect >= cxx0x)
10111 sorry ("non-static data member initializers");
10115 permerror (input_location, "ISO C++ forbids initialization of member %qD",
10117 permerror (input_location, "making %qD static", unqualified_id);
10125 /* C++ allows static class members. All other work
10126 for this is done by grokfield. */
10127 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10128 set_linkage_for_static_data_member (decl);
10129 /* Even if there is an in-class initialization, DECL
10130 is considered undefined until an out-of-class
10131 definition is provided. */
10132 DECL_EXTERNAL (decl) = 1;
10135 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10137 if (constexpr_p && !initialized)
10139 error ("constexpr static data member %qD must have an "
10140 "initializer", decl);
10141 constexpr_p = false;
10148 error ("non-static data member %qE declared %<constexpr%>",
10150 constexpr_p = false;
10152 decl = build_decl (input_location,
10153 FIELD_DECL, unqualified_id, type);
10154 DECL_NONADDRESSABLE_P (decl) = bitfield;
10155 if (bitfield && !unqualified_id)
10156 TREE_NO_WARNING (decl) = 1;
10158 if (storage_class == sc_mutable)
10160 DECL_MUTABLE_P (decl) = 1;
10161 storage_class = sc_none;
10165 bad_specifiers (decl, BSP_FIELD, virtualp,
10166 memfn_quals != TYPE_UNQUALIFIED,
10167 inlinep, friendp, raises != NULL_TREE);
10170 else if (TREE_CODE (type) == FUNCTION_TYPE
10171 || TREE_CODE (type) == METHOD_TYPE)
10173 tree original_name;
10176 if (!unqualified_id)
10177 return error_mark_node;
10179 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10180 original_name = dname;
10182 original_name = unqualified_id;
10184 if (storage_class == sc_auto)
10185 error ("storage class %<auto%> invalid for function %qs", name);
10186 else if (storage_class == sc_register)
10187 error ("storage class %<register%> invalid for function %qs", name);
10189 error ("storage class %<__thread%> invalid for function %qs", name);
10191 if (virt_specifiers)
10192 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10193 /* Function declaration not at top level.
10194 Storage classes other than `extern' are not allowed
10195 and `extern' makes no difference. */
10196 if (! toplevel_bindings_p ()
10197 && (storage_class == sc_static
10198 || declspecs->specs[(int)ds_inline])
10201 if (storage_class == sc_static)
10202 pedwarn (input_location, OPT_pedantic,
10203 "%<static%> specified invalid for function %qs "
10204 "declared out of global scope", name);
10206 pedwarn (input_location, OPT_pedantic,
10207 "%<inline%> specifier invalid for function %qs "
10208 "declared out of global scope", name);
10211 if (ctype == NULL_TREE)
10215 error ("virtual non-class function %qs", name);
10218 else if (sfk == sfk_constructor
10219 || sfk == sfk_destructor)
10221 error (funcdef_flag
10222 ? "%qs defined in a non-class scope"
10223 : "%qs declared in a non-class scope", name);
10228 /* Record presence of `static'. */
10229 publicp = (ctype != NULL_TREE
10230 || storage_class == sc_extern
10231 || storage_class != sc_static);
10233 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10234 virtualp, flags, memfn_quals, raises,
10236 publicp, inlinep | (2 * constexpr_p), sfk,
10238 template_count, in_namespace, attrlist,
10239 declarator->id_loc);
10240 if (decl == NULL_TREE)
10241 return error_mark_node;
10245 int invalid_static = 0;
10247 /* Don't allow a static member function in a class, and forbid
10248 declaring main to be static. */
10249 if (TREE_CODE (type) == METHOD_TYPE)
10251 permerror (input_location, "cannot declare member function %qD to have "
10252 "static linkage", decl);
10253 invalid_static = 1;
10255 else if (current_function_decl)
10257 /* FIXME need arm citation */
10258 error ("cannot declare static function inside another function");
10259 invalid_static = 1;
10262 if (invalid_static)
10265 storage_class = sc_none;
10271 /* It's a variable. */
10273 /* An uninitialized decl with `extern' is a reference. */
10274 decl = grokvardecl (type, unqualified_id,
10277 (type_quals & TYPE_QUAL_CONST) != 0,
10278 ctype ? ctype : in_namespace);
10279 bad_specifiers (decl, BSP_VAR, virtualp,
10280 memfn_quals != TYPE_UNQUALIFIED,
10281 inlinep, friendp, raises != NULL_TREE);
10285 DECL_CONTEXT (decl) = ctype;
10288 permerror (input_location, "%<static%> may not be used when defining "
10289 "(as opposed to declaring) a static data member");
10291 storage_class = sc_none;
10293 if (storage_class == sc_register && TREE_STATIC (decl))
10295 error ("static member %qD declared %<register%>", decl);
10296 storage_class = sc_none;
10298 if (storage_class == sc_extern && pedantic)
10300 pedwarn (input_location, OPT_pedantic,
10301 "cannot explicitly declare member %q#D to have "
10302 "extern linkage", decl);
10303 storage_class = sc_none;
10306 else if (constexpr_p && DECL_EXTERNAL (decl))
10308 error ("declaration of constexpr variable %qD is not a definition",
10310 constexpr_p = false;
10314 if (storage_class == sc_extern && initialized && !funcdef_flag)
10316 if (toplevel_bindings_p ())
10318 /* It's common practice (and completely valid) to have a const
10319 be initialized and declared extern. */
10320 if (!(type_quals & TYPE_QUAL_CONST))
10321 warning (0, "%qs initialized and declared %<extern%>", name);
10325 error ("%qs has both %<extern%> and initializer", name);
10326 return error_mark_node;
10330 /* Record `register' declaration for warnings on &
10331 and in case doing stupid register allocation. */
10333 if (storage_class == sc_register)
10334 DECL_REGISTER (decl) = 1;
10335 else if (storage_class == sc_extern)
10336 DECL_THIS_EXTERN (decl) = 1;
10337 else if (storage_class == sc_static)
10338 DECL_THIS_STATIC (decl) = 1;
10340 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10341 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10342 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10344 /* Record constancy and volatility on the DECL itself . There's
10345 no need to do this when processing a template; we'll do this
10346 for the instantiated declaration based on the type of DECL. */
10347 if (!processing_template_decl)
10348 cp_apply_type_quals_to_decl (type_quals, decl);
10354 /* Subroutine of start_function. Ensure that each of the parameter
10355 types (as listed in PARMS) is complete, as is required for a
10356 function definition. */
10359 require_complete_types_for_parms (tree parms)
10361 for (; parms; parms = DECL_CHAIN (parms))
10363 if (dependent_type_p (TREE_TYPE (parms)))
10365 if (!VOID_TYPE_P (TREE_TYPE (parms))
10366 && complete_type_or_else (TREE_TYPE (parms), parms))
10368 relayout_decl (parms);
10369 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10372 /* grokparms or complete_type_or_else will have already issued
10374 TREE_TYPE (parms) = error_mark_node;
10378 /* Returns nonzero if T is a local variable. */
10381 local_variable_p (const_tree t)
10383 if ((TREE_CODE (t) == VAR_DECL
10384 /* A VAR_DECL with a context that is a _TYPE is a static data
10386 && !TYPE_P (CP_DECL_CONTEXT (t))
10387 /* Any other non-local variable must be at namespace scope. */
10388 && !DECL_NAMESPACE_SCOPE_P (t))
10389 || (TREE_CODE (t) == PARM_DECL))
10395 /* Like local_variable_p, but suitable for use as a tree-walking
10399 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10400 void *data ATTRIBUTE_UNUSED)
10402 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10404 else if (TYPE_P (*tp))
10405 *walk_subtrees = 0;
10411 /* Check that ARG, which is a default-argument expression for a
10412 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10413 something goes wrong. DECL may also be a _TYPE node, rather than a
10414 DECL, if there is no DECL available. */
10417 check_default_argument (tree decl, tree arg)
10422 if (TREE_CODE (arg) == DEFAULT_ARG)
10423 /* We get a DEFAULT_ARG when looking at an in-class declaration
10424 with a default argument. Ignore the argument for now; we'll
10425 deal with it after the class is complete. */
10434 decl_type = TREE_TYPE (decl);
10436 if (arg == error_mark_node
10437 || decl == error_mark_node
10438 || TREE_TYPE (arg) == error_mark_node
10439 || decl_type == error_mark_node)
10440 /* Something already went wrong. There's no need to check
10442 return error_mark_node;
10444 /* [dcl.fct.default]
10446 A default argument expression is implicitly converted to the
10448 if (!TREE_TYPE (arg)
10449 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10452 error ("default argument for %q#D has type %qT",
10453 decl, TREE_TYPE (arg));
10455 error ("default argument for parameter of type %qT has type %qT",
10456 decl_type, TREE_TYPE (arg));
10458 return error_mark_node;
10461 /* [dcl.fct.default]
10463 Local variables shall not be used in default argument
10466 The keyword `this' shall not be used in a default argument of a
10467 member function. */
10468 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10471 error ("default argument %qE uses local variable %qD", arg, var);
10472 return error_mark_node;
10479 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10482 type_is_deprecated (tree type)
10484 enum tree_code code;
10485 if (TREE_DEPRECATED (type))
10487 if (TYPE_NAME (type)
10488 && TREE_DEPRECATED (TYPE_NAME (type)))
10491 /* Do warn about using typedefs to a deprecated class. */
10492 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10493 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10495 code = TREE_CODE (type);
10497 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10498 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10499 || code == METHOD_TYPE || code == ARRAY_TYPE)
10500 return type_is_deprecated (TREE_TYPE (type));
10502 if (TYPE_PTRMEMFUNC_P (type))
10503 return type_is_deprecated
10504 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10509 /* Decode the list of parameter types for a function type.
10510 Given the list of things declared inside the parens,
10511 return a list of types.
10513 If this parameter does not end with an ellipsis, we append
10516 *PARMS is set to the chain of PARM_DECLs created. */
10519 grokparms (tree parmlist, tree *parms)
10521 tree result = NULL_TREE;
10522 tree decls = NULL_TREE;
10526 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10528 tree type = NULL_TREE;
10529 tree init = TREE_PURPOSE (parm);
10530 tree decl = TREE_VALUE (parm);
10531 const char *errmsg;
10533 if (parm == void_list_node)
10536 if (! decl || TREE_TYPE (decl) == error_mark_node)
10539 type = TREE_TYPE (decl);
10540 if (VOID_TYPE_P (type))
10542 if (same_type_p (type, void_type_node)
10543 && DECL_SELF_REFERENCE_P (type)
10544 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10545 /* this is a parmlist of `(void)', which is ok. */
10547 cxx_incomplete_type_error (decl, type);
10548 /* It's not a good idea to actually create parameters of
10549 type `void'; other parts of the compiler assume that a
10550 void type terminates the parameter list. */
10551 type = error_mark_node;
10552 TREE_TYPE (decl) = error_mark_node;
10555 if (type != error_mark_node
10556 && TYPE_FOR_JAVA (type)
10557 && MAYBE_CLASS_TYPE_P (type))
10559 error ("parameter %qD has Java class type", decl);
10560 type = error_mark_node;
10561 TREE_TYPE (decl) = error_mark_node;
10565 if (type != error_mark_node
10566 && (errmsg = targetm.invalid_parameter_type (type)))
10569 type = error_mark_node;
10570 TREE_TYPE (decl) = error_mark_node;
10573 if (type != error_mark_node)
10575 if (deprecated_state != DEPRECATED_SUPPRESS)
10577 tree deptype = type_is_deprecated (type);
10579 warn_deprecated_use (deptype, NULL_TREE);
10582 /* Top-level qualifiers on the parameters are
10583 ignored for function types. */
10584 type = cp_build_qualified_type (type, 0);
10585 if (TREE_CODE (type) == METHOD_TYPE)
10587 error ("parameter %qD invalidly declared method type", decl);
10588 type = build_pointer_type (type);
10589 TREE_TYPE (decl) = type;
10591 else if (abstract_virtuals_error (decl, type))
10592 any_error = 1; /* Seems like a good idea. */
10593 else if (POINTER_TYPE_P (type))
10595 /* [dcl.fct]/6, parameter types cannot contain pointers
10596 (references) to arrays of unknown bound. */
10597 tree t = TREE_TYPE (type);
10598 int ptr = TYPE_PTR_P (type);
10602 if (TYPE_PTR_P (t))
10604 else if (TREE_CODE (t) != ARRAY_TYPE)
10606 else if (!TYPE_DOMAIN (t))
10610 if (TREE_CODE (t) == ARRAY_TYPE)
10612 ? G_("parameter %qD includes pointer to array of "
10613 "unknown bound %qT")
10614 : G_("parameter %qD includes reference to array of "
10615 "unknown bound %qT"),
10621 else if (init && !processing_template_decl)
10622 init = check_default_argument (decl, init);
10625 DECL_CHAIN (decl) = decls;
10627 result = tree_cons (init, type, result);
10629 decls = nreverse (decls);
10630 result = nreverse (result);
10632 result = chainon (result, void_list_node);
10639 /* D is a constructor or overloaded `operator='.
10641 Let T be the class in which D is declared. Then, this function
10644 -1 if D's is an ill-formed constructor or copy assignment operator
10645 whose first parameter is of type `T'.
10646 0 if D is not a copy constructor or copy assignment
10648 1 if D is a copy constructor or copy assignment operator whose
10649 first parameter is a reference to non-const qualified T.
10650 2 if D is a copy constructor or copy assignment operator whose
10651 first parameter is a reference to const qualified T.
10653 This function can be used as a predicate. Positive values indicate
10654 a copy constructor and nonzero values indicate a copy assignment
10658 copy_fn_p (const_tree d)
10664 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10666 if (TREE_CODE (d) == TEMPLATE_DECL
10667 || (DECL_TEMPLATE_INFO (d)
10668 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10669 /* Instantiations of template member functions are never copy
10670 functions. Note that member functions of templated classes are
10671 represented as template functions internally, and we must
10672 accept those as copy functions. */
10675 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10679 arg_type = TREE_VALUE (args);
10680 if (arg_type == error_mark_node)
10683 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10685 /* Pass by value copy assignment operator. */
10688 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10689 && !TYPE_REF_IS_RVALUE (arg_type)
10690 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10692 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10698 args = TREE_CHAIN (args);
10700 if (args && args != void_list_node && !TREE_PURPOSE (args))
10701 /* There are more non-optional args. */
10707 /* D is a constructor or overloaded `operator='.
10709 Let T be the class in which D is declared. Then, this function
10710 returns true when D is a move constructor or move assignment
10711 operator, false otherwise. */
10714 move_fn_p (const_tree d)
10718 bool result = false;
10720 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10722 if (cxx_dialect == cxx98)
10723 /* There are no move constructors if we are in C++98 mode. */
10726 if (TREE_CODE (d) == TEMPLATE_DECL
10727 || (DECL_TEMPLATE_INFO (d)
10728 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10729 /* Instantiations of template member functions are never copy
10730 functions. Note that member functions of templated classes are
10731 represented as template functions internally, and we must
10732 accept those as copy functions. */
10735 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10739 arg_type = TREE_VALUE (args);
10740 if (arg_type == error_mark_node)
10743 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10744 && TYPE_REF_IS_RVALUE (arg_type)
10745 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10749 args = TREE_CHAIN (args);
10751 if (args && args != void_list_node && !TREE_PURPOSE (args))
10752 /* There are more non-optional args. */
10758 /* Remember any special properties of member function DECL. */
10761 grok_special_member_properties (tree decl)
10765 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10768 class_type = DECL_CONTEXT (decl);
10769 if (DECL_CONSTRUCTOR_P (decl))
10771 int ctor = copy_fn_p (decl);
10773 if (!DECL_ARTIFICIAL (decl))
10774 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10780 A non-template constructor for class X is a copy
10781 constructor if its first parameter is of type X&, const
10782 X&, volatile X& or const volatile X&, and either there
10783 are no other parameters or else all other parameters have
10784 default arguments. */
10785 TYPE_HAS_COPY_CTOR (class_type) = 1;
10786 if (user_provided_p (decl))
10787 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10789 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10791 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10793 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10794 if (user_provided_p (decl))
10795 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10797 else if (move_fn_p (decl) && user_provided_p (decl))
10798 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10799 else if (is_list_ctor (decl))
10800 TYPE_HAS_LIST_CTOR (class_type) = 1;
10802 if (DECL_DECLARED_CONSTEXPR_P (decl)
10803 && !copy_fn_p (decl) && !move_fn_p (decl))
10804 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10806 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10810 A non-template assignment operator for class X is a copy
10811 assignment operator if its parameter is of type X, X&, const
10812 X&, volatile X& or const volatile X&. */
10814 int assop = copy_fn_p (decl);
10818 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10819 if (user_provided_p (decl))
10820 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10822 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10824 else if (move_fn_p (decl) && user_provided_p (decl))
10825 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10827 /* Destructors are handled in check_methods. */
10830 /* Check a constructor DECL has the correct form. Complains
10831 if the class has a constructor of the form X(X). */
10834 grok_ctor_properties (const_tree ctype, const_tree decl)
10836 int ctor_parm = copy_fn_p (decl);
10842 A declaration of a constructor for a class X is ill-formed if
10843 its first parameter is of type (optionally cv-qualified) X
10844 and either there are no other parameters or else all other
10845 parameters have default arguments.
10847 We *don't* complain about member template instantiations that
10848 have this form, though; they can occur as we try to decide
10849 what constructor to use during overload resolution. Since
10850 overload resolution will never prefer such a constructor to
10851 the non-template copy constructor (which is either explicitly
10852 or implicitly defined), there's no need to worry about their
10853 existence. Theoretically, they should never even be
10854 instantiated, but that's hard to forestall. */
10855 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10863 /* An operator with this code is unary, but can also be binary. */
10866 ambi_op_p (enum tree_code code)
10868 return (code == INDIRECT_REF
10869 || code == ADDR_EXPR
10870 || code == UNARY_PLUS_EXPR
10871 || code == NEGATE_EXPR
10872 || code == PREINCREMENT_EXPR
10873 || code == PREDECREMENT_EXPR);
10876 /* An operator with this name can only be unary. */
10879 unary_op_p (enum tree_code code)
10881 return (code == TRUTH_NOT_EXPR
10882 || code == BIT_NOT_EXPR
10883 || code == COMPONENT_REF
10884 || code == TYPE_EXPR);
10887 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10888 errors are issued for invalid declarations. */
10891 grok_op_properties (tree decl, bool complain)
10893 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10895 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10896 tree name = DECL_NAME (decl);
10897 enum tree_code operator_code;
10902 /* Count the number of arguments and check for ellipsis. */
10903 for (argtype = argtypes, arity = 0;
10904 argtype && argtype != void_list_node;
10905 argtype = TREE_CHAIN (argtype))
10907 ellipsis_p = !argtype;
10909 class_type = DECL_CONTEXT (decl);
10910 if (class_type && !CLASS_TYPE_P (class_type))
10911 class_type = NULL_TREE;
10913 if (DECL_CONV_FN_P (decl))
10914 operator_code = TYPE_EXPR;
10918 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10919 if (ansi_opname (CODE) == name) \
10921 operator_code = (CODE); \
10924 else if (ansi_assopname (CODE) == name) \
10926 operator_code = (CODE); \
10927 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10931 #include "operators.def"
10932 #undef DEF_OPERATOR
10934 gcc_unreachable ();
10937 gcc_assert (operator_code != MAX_TREE_CODES);
10938 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10941 switch (operator_code)
10944 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10948 TYPE_GETS_DELETE (class_type) |= 1;
10952 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10955 case VEC_DELETE_EXPR:
10956 TYPE_GETS_DELETE (class_type) |= 2;
10963 /* [basic.std.dynamic.allocation]/1:
10965 A program is ill-formed if an allocation function is declared
10966 in a namespace scope other than global scope or declared static
10969 The same also holds true for deallocation functions. */
10970 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10971 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10973 if (DECL_NAMESPACE_SCOPE_P (decl))
10975 if (CP_DECL_CONTEXT (decl) != global_namespace)
10977 error ("%qD may not be declared within a namespace", decl);
10980 else if (!TREE_PUBLIC (decl))
10982 error ("%qD may not be declared as static", decl);
10988 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10990 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10991 DECL_IS_OPERATOR_NEW (decl) = 1;
10993 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10994 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10997 /* An operator function must either be a non-static member function
10998 or have at least one parameter of a class, a reference to a class,
10999 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11000 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11002 if (operator_code == TYPE_EXPR
11003 || operator_code == CALL_EXPR
11004 || operator_code == COMPONENT_REF
11005 || operator_code == ARRAY_REF
11006 || operator_code == NOP_EXPR)
11008 error ("%qD must be a nonstatic member function", decl);
11015 if (DECL_STATIC_FUNCTION_P (decl))
11017 error ("%qD must be either a non-static member "
11018 "function or a non-member function", decl);
11022 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11024 tree arg = non_reference (TREE_VALUE (p));
11025 if (arg == error_mark_node)
11028 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11029 because these checks are performed even on
11030 template functions. */
11031 if (MAYBE_CLASS_TYPE_P (arg)
11032 || TREE_CODE (arg) == ENUMERAL_TYPE)
11036 if (!p || p == void_list_node)
11039 error ("%qD must have an argument of class or "
11040 "enumerated type", decl);
11046 /* There are no restrictions on the arguments to an overloaded
11048 if (operator_code == CALL_EXPR)
11051 /* Warn about conversion operators that will never be used. */
11052 if (IDENTIFIER_TYPENAME_P (name)
11053 && ! DECL_TEMPLATE_INFO (decl)
11055 /* Warn only declaring the function; there is no need to
11056 warn again about out-of-class definitions. */
11057 && class_type == current_class_type)
11059 tree t = TREE_TYPE (name);
11060 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11063 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11065 if (TREE_CODE (t) == VOID_TYPE)
11066 warning (OPT_Wconversion,
11068 ? G_("conversion to a reference to void "
11069 "will never use a type conversion operator")
11070 : G_("conversion to void "
11071 "will never use a type conversion operator"));
11072 else if (class_type)
11074 if (t == class_type)
11075 warning (OPT_Wconversion,
11077 ? G_("conversion to a reference to the same type "
11078 "will never use a type conversion operator")
11079 : G_("conversion to the same type "
11080 "will never use a type conversion operator"));
11081 /* Don't force t to be complete here. */
11082 else if (MAYBE_CLASS_TYPE_P (t)
11083 && COMPLETE_TYPE_P (t)
11084 && DERIVED_FROM_P (t, class_type))
11085 warning (OPT_Wconversion,
11087 ? G_("conversion to a reference to a base class "
11088 "will never use a type conversion operator")
11089 : G_("conversion to a base class "
11090 "will never use a type conversion operator"));
11095 if (operator_code == COND_EXPR)
11098 error ("ISO C++ prohibits overloading operator ?:");
11101 else if (ellipsis_p)
11103 error ("%qD must not have variable number of arguments", decl);
11106 else if (ambi_op_p (operator_code))
11109 /* We pick the one-argument operator codes by default, so
11110 we don't have to change anything. */
11112 else if (arity == 2)
11114 /* If we thought this was a unary operator, we now know
11115 it to be a binary operator. */
11116 switch (operator_code)
11119 operator_code = MULT_EXPR;
11123 operator_code = BIT_AND_EXPR;
11126 case UNARY_PLUS_EXPR:
11127 operator_code = PLUS_EXPR;
11131 operator_code = MINUS_EXPR;
11134 case PREINCREMENT_EXPR:
11135 operator_code = POSTINCREMENT_EXPR;
11138 case PREDECREMENT_EXPR:
11139 operator_code = POSTDECREMENT_EXPR;
11143 gcc_unreachable ();
11146 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11148 if ((operator_code == POSTINCREMENT_EXPR
11149 || operator_code == POSTDECREMENT_EXPR)
11150 && ! processing_template_decl
11151 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11154 error ("postfix %qD must take %<int%> as its argument",
11157 error ("postfix %qD must take %<int%> as its second "
11165 error ("%qD must take either zero or one argument", decl);
11167 error ("%qD must take either one or two arguments", decl);
11171 /* More Effective C++ rule 6. */
11173 && (operator_code == POSTINCREMENT_EXPR
11174 || operator_code == POSTDECREMENT_EXPR
11175 || operator_code == PREINCREMENT_EXPR
11176 || operator_code == PREDECREMENT_EXPR))
11178 tree arg = TREE_VALUE (argtypes);
11179 tree ret = TREE_TYPE (TREE_TYPE (decl));
11180 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11181 arg = TREE_TYPE (arg);
11182 arg = TYPE_MAIN_VARIANT (arg);
11183 if (operator_code == PREINCREMENT_EXPR
11184 || operator_code == PREDECREMENT_EXPR)
11186 if (TREE_CODE (ret) != REFERENCE_TYPE
11187 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11189 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11190 build_reference_type (arg));
11194 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11195 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11199 else if (unary_op_p (operator_code))
11204 error ("%qD must take %<void%>", decl);
11206 error ("%qD must take exactly one argument", decl);
11210 else /* if (binary_op_p (operator_code)) */
11215 error ("%qD must take exactly one argument", decl);
11217 error ("%qD must take exactly two arguments", decl);
11221 /* More Effective C++ rule 7. */
11223 && (operator_code == TRUTH_ANDIF_EXPR
11224 || operator_code == TRUTH_ORIF_EXPR
11225 || operator_code == COMPOUND_EXPR))
11226 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11230 /* Effective C++ rule 23. */
11233 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11234 && (operator_code == PLUS_EXPR
11235 || operator_code == MINUS_EXPR
11236 || operator_code == TRUNC_DIV_EXPR
11237 || operator_code == MULT_EXPR
11238 || operator_code == TRUNC_MOD_EXPR)
11239 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11240 warning (OPT_Weffc__, "%qD should return by value", decl);
11242 /* [over.oper]/8 */
11243 for (; argtypes && argtypes != void_list_node;
11244 argtypes = TREE_CHAIN (argtypes))
11245 if (TREE_PURPOSE (argtypes))
11247 TREE_PURPOSE (argtypes) = NULL_TREE;
11248 if (operator_code == POSTINCREMENT_EXPR
11249 || operator_code == POSTDECREMENT_EXPR)
11251 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11256 error ("%qD cannot have default arguments", decl);
11264 /* Return a string giving the keyword associate with CODE. */
11266 static const char *
11267 tag_name (enum tag_types code)
11279 case typename_type:
11282 gcc_unreachable ();
11286 /* Name lookup in an elaborated-type-specifier (after the keyword
11287 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11288 elaborated-type-specifier is invalid, issue a diagnostic and return
11289 error_mark_node; otherwise, return the *_TYPE to which it referred.
11290 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11293 check_elaborated_type_specifier (enum tag_types tag_code,
11295 bool allow_template_p)
11301 struct S { struct S *p; };
11303 name lookup will find the TYPE_DECL for the implicit "S::S"
11304 typedef. Adjust for that here. */
11305 if (DECL_SELF_REFERENCE_P (decl))
11306 decl = TYPE_NAME (TREE_TYPE (decl));
11308 type = TREE_TYPE (decl);
11310 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11311 is false for this case as well. */
11312 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11314 error ("using template type parameter %qT after %qs",
11315 type, tag_name (tag_code));
11316 return error_mark_node;
11320 If the identifier resolves to a typedef-name or a template
11321 type-parameter, the elaborated-type-specifier is ill-formed.
11323 In other words, the only legitimate declaration to use in the
11324 elaborated type specifier is the implicit typedef created when
11325 the type is declared. */
11326 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11327 && !DECL_SELF_REFERENCE_P (decl)
11328 && tag_code != typename_type)
11330 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11331 error ("%q+D has a previous declaration here", decl);
11332 return error_mark_node;
11334 else if (TREE_CODE (type) != RECORD_TYPE
11335 && TREE_CODE (type) != UNION_TYPE
11336 && tag_code != enum_type
11337 && tag_code != typename_type)
11339 error ("%qT referred to as %qs", type, tag_name (tag_code));
11340 error ("%q+T has a previous declaration here", type);
11341 return error_mark_node;
11343 else if (TREE_CODE (type) != ENUMERAL_TYPE
11344 && tag_code == enum_type)
11346 error ("%qT referred to as enum", type);
11347 error ("%q+T has a previous declaration here", type);
11348 return error_mark_node;
11350 else if (!allow_template_p
11351 && TREE_CODE (type) == RECORD_TYPE
11352 && CLASSTYPE_IS_TEMPLATE (type))
11354 /* If a class template appears as elaborated type specifier
11355 without a template header such as:
11357 template <class T> class C {};
11358 void f(class C); // No template header here
11360 then the required template argument is missing. */
11361 error ("template argument required for %<%s %T%>",
11362 tag_name (tag_code),
11363 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11364 return error_mark_node;
11370 /* Lookup NAME in elaborate type specifier in scope according to
11371 SCOPE and issue diagnostics if necessary.
11372 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11373 found, and ERROR_MARK_NODE for type error. */
11376 lookup_and_check_tag (enum tag_types tag_code, tree name,
11377 tag_scope scope, bool template_header_p)
11381 if (scope == ts_global)
11383 /* First try ordinary name lookup, ignoring hidden class name
11384 injected via friend declaration. */
11385 decl = lookup_name_prefer_type (name, 2);
11386 /* If that fails, the name will be placed in the smallest
11387 non-class, non-function-prototype scope according to 3.3.1/5.
11388 We may already have a hidden name declared as friend in this
11389 scope. So lookup again but not ignoring hidden names.
11390 If we find one, that name will be made visible rather than
11391 creating a new tag. */
11393 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11396 decl = lookup_type_scope (name, scope);
11398 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11399 decl = DECL_TEMPLATE_RESULT (decl);
11401 if (decl && TREE_CODE (decl) == TYPE_DECL)
11403 /* Look for invalid nested type:
11407 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11409 error ("%qD has the same name as the class in which it is "
11412 return error_mark_node;
11415 /* Two cases we need to consider when deciding if a class
11416 template is allowed as an elaborated type specifier:
11417 1. It is a self reference to its own class.
11418 2. It comes with a template header.
11422 template <class T> class C {
11423 class C *c1; // DECL_SELF_REFERENCE_P is true
11426 template <class U> class C; // template_header_p is true
11427 template <class T> class C<T>::D {
11428 class C *c2; // DECL_SELF_REFERENCE_P is true
11431 t = check_elaborated_type_specifier (tag_code,
11434 | DECL_SELF_REFERENCE_P (decl));
11437 else if (decl && TREE_CODE (decl) == TREE_LIST)
11439 error ("reference to %qD is ambiguous", name);
11440 print_candidates (decl);
11441 return error_mark_node;
11447 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11448 Define the tag as a forward-reference if it is not defined.
11450 If a declaration is given, process it here, and report an error if
11451 multiple declarations are not identical.
11453 SCOPE is TS_CURRENT when this is also a definition. Only look in
11454 the current frame for the name (since C++ allows new names in any
11455 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11456 declaration. Only look beginning from the current scope outward up
11457 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11459 TEMPLATE_HEADER_P is true when this declaration is preceded by
11460 a set of template parameters. */
11463 xref_tag_1 (enum tag_types tag_code, tree name,
11464 tag_scope scope, bool template_header_p)
11466 enum tree_code code;
11468 tree context = NULL_TREE;
11470 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11476 code = RECORD_TYPE;
11482 code = ENUMERAL_TYPE;
11485 gcc_unreachable ();
11488 /* In case of anonymous name, xref_tag is only called to
11489 make type node and push name. Name lookup is not required. */
11490 if (ANON_AGGRNAME_P (name))
11493 t = lookup_and_check_tag (tag_code, name,
11494 scope, template_header_p);
11496 if (t == error_mark_node)
11497 return error_mark_node;
11499 if (scope != ts_current && t && current_class_type
11500 && template_class_depth (current_class_type)
11501 && template_header_p)
11503 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11504 definition of this tag. Since, in addition, we are currently
11505 processing a (member) template declaration of a template
11506 class, we must be very careful; consider:
11513 { template <class V>
11514 friend struct S1; };
11516 Here, the S2::S1 declaration should not be confused with the
11517 outer declaration. In particular, the inner version should
11518 have a template parameter of level 2, not level 1. This
11519 would be particularly important if the member declaration
11522 template <class V = U> friend struct S1;
11524 say, when we should tsubst into `U' when instantiating
11525 S2. On the other hand, when presented with:
11535 we must find the inner binding eventually. We
11536 accomplish this by making sure that the new type we
11537 create to represent this declaration has the right
11539 context = TYPE_CONTEXT (t);
11545 /* If no such tag is yet defined, create a forward-reference node
11546 and record it as the "definition".
11547 When a real declaration of this type is found,
11548 the forward-reference will be altered into a real type. */
11549 if (code == ENUMERAL_TYPE)
11551 error ("use of enum %q#D without previous declaration", name);
11552 return error_mark_node;
11556 t = make_class_type (code);
11557 TYPE_CONTEXT (t) = context;
11558 t = pushtag (name, t, scope);
11563 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11565 if (!redeclare_class_template (t, current_template_parms))
11566 return error_mark_node;
11568 else if (!processing_template_decl
11569 && CLASS_TYPE_P (t)
11570 && CLASSTYPE_IS_TEMPLATE (t))
11572 error ("redeclaration of %qT as a non-template", t);
11573 error ("previous declaration %q+D", t);
11574 return error_mark_node;
11577 /* Make injected friend class visible. */
11578 if (scope != ts_within_enclosing_non_class
11579 && hidden_name_p (TYPE_NAME (t)))
11581 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11582 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11584 if (TYPE_TEMPLATE_INFO (t))
11586 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11587 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11595 /* Wrapper for xref_tag_1. */
11598 xref_tag (enum tag_types tag_code, tree name,
11599 tag_scope scope, bool template_header_p)
11602 timevar_start (TV_NAME_LOOKUP);
11603 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11604 timevar_stop (TV_NAME_LOOKUP);
11610 xref_tag_from_type (tree old, tree id, tag_scope scope)
11612 enum tag_types tag_kind;
11614 if (TREE_CODE (old) == RECORD_TYPE)
11615 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11617 tag_kind = union_type;
11619 if (id == NULL_TREE)
11620 id = TYPE_IDENTIFIER (old);
11622 return xref_tag (tag_kind, id, scope, false);
11625 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11626 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11627 access_* node, and the TREE_VALUE is the type of the base-class.
11628 Non-NULL TREE_TYPE indicates virtual inheritance.
11630 Returns true if the binfo hierarchy was successfully created,
11631 false if an error was detected. */
11634 xref_basetypes (tree ref, tree base_list)
11637 tree binfo, base_binfo;
11638 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11639 unsigned max_bases = 0; /* Maximum direct bases. */
11641 tree default_access;
11642 tree igo_prev; /* Track Inheritance Graph Order. */
11644 if (ref == error_mark_node)
11647 /* The base of a derived class is private by default, all others are
11649 default_access = (TREE_CODE (ref) == RECORD_TYPE
11650 && CLASSTYPE_DECLARED_CLASS (ref)
11651 ? access_private_node : access_public_node);
11653 /* First, make sure that any templates in base-classes are
11654 instantiated. This ensures that if we call ourselves recursively
11655 we do not get confused about which classes are marked and which
11657 basep = &base_list;
11660 tree basetype = TREE_VALUE (*basep);
11662 if (!(processing_template_decl && uses_template_parms (basetype))
11663 && !complete_type_or_else (basetype, NULL))
11664 /* An incomplete type. Remove it from the list. */
11665 *basep = TREE_CHAIN (*basep);
11669 if (TREE_TYPE (*basep))
11671 if (CLASS_TYPE_P (basetype))
11672 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11673 basep = &TREE_CHAIN (*basep);
11677 TYPE_MARKED_P (ref) = 1;
11679 /* The binfo slot should be empty, unless this is an (ill-formed)
11681 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11683 error ("redefinition of %q#T", ref);
11687 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11689 binfo = make_tree_binfo (max_bases);
11691 TYPE_BINFO (ref) = binfo;
11692 BINFO_OFFSET (binfo) = size_zero_node;
11693 BINFO_TYPE (binfo) = ref;
11695 /* Apply base-class info set up to the variants of this type. */
11696 fixup_type_variants (ref);
11700 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11701 /* An aggregate cannot have baseclasses. */
11702 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11704 if (TREE_CODE (ref) == UNION_TYPE)
11706 error ("derived union %qT invalid", ref);
11713 if (TYPE_FOR_JAVA (ref))
11715 error ("Java class %qT cannot have multiple bases", ref);
11722 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11724 if (TYPE_FOR_JAVA (ref))
11726 error ("Java class %qT cannot have virtual bases", ref);
11731 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11733 tree access = TREE_PURPOSE (base_list);
11734 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11735 tree basetype = TREE_VALUE (base_list);
11737 if (access == access_default_node)
11738 access = default_access;
11740 if (PACK_EXPANSION_P (basetype))
11741 basetype = PACK_EXPANSION_PATTERN (basetype);
11742 if (TREE_CODE (basetype) == TYPE_DECL)
11743 basetype = TREE_TYPE (basetype);
11744 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11746 error ("base type %qT fails to be a struct or class type",
11751 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11752 TYPE_FOR_JAVA (ref) = 1;
11754 base_binfo = NULL_TREE;
11755 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11757 base_binfo = TYPE_BINFO (basetype);
11758 /* The original basetype could have been a typedef'd type. */
11759 basetype = BINFO_TYPE (base_binfo);
11761 /* Inherit flags from the base. */
11762 TYPE_HAS_NEW_OPERATOR (ref)
11763 |= TYPE_HAS_NEW_OPERATOR (basetype);
11764 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11765 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11766 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11767 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11768 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11769 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11770 CLASSTYPE_REPEATED_BASE_P (ref)
11771 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11774 /* We must do this test after we've seen through a typedef
11776 if (TYPE_MARKED_P (basetype))
11778 if (basetype == ref)
11779 error ("recursive type %qT undefined", basetype);
11781 error ("duplicate base type %qT invalid", basetype);
11785 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11786 /* Regenerate the pack expansion for the bases. */
11787 basetype = make_pack_expansion (basetype);
11789 TYPE_MARKED_P (basetype) = 1;
11791 base_binfo = copy_binfo (base_binfo, basetype, ref,
11792 &igo_prev, via_virtual);
11793 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11794 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11796 BINFO_BASE_APPEND (binfo, base_binfo);
11797 BINFO_BASE_ACCESS_APPEND (binfo, access);
11800 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11801 /* If we have space in the vbase vector, we must have shared at
11802 least one of them, and are therefore diamond shaped. */
11803 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11805 /* Unmark all the types. */
11806 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11807 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11808 TYPE_MARKED_P (ref) = 0;
11810 /* Now see if we have a repeated base type. */
11811 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11813 for (base_binfo = binfo; base_binfo;
11814 base_binfo = TREE_CHAIN (base_binfo))
11816 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11818 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11821 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11823 for (base_binfo = binfo; base_binfo;
11824 base_binfo = TREE_CHAIN (base_binfo))
11825 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11826 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11835 /* Copies the enum-related properties from type SRC to type DST.
11836 Used with the underlying type of an enum and the enum itself. */
11838 copy_type_enum (tree dst, tree src)
11840 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11841 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11842 TYPE_SIZE (dst) = TYPE_SIZE (src);
11843 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11844 SET_TYPE_MODE (dst, TYPE_MODE (src));
11845 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11846 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11847 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11848 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11851 /* Begin compiling the definition of an enumeration type.
11854 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11856 UNDERLYING_TYPE is the type that will be used as the storage for
11857 the enumeration type. This should be NULL_TREE if no storage type
11860 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11862 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11864 Returns the type object, as yet incomplete.
11865 Also records info about it so that build_enumerator
11866 may be used to declare the individual values as they are read. */
11869 start_enum (tree name, tree enumtype, tree underlying_type,
11870 bool scoped_enum_p, bool *is_new)
11872 tree prevtype = NULL_TREE;
11873 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11877 /* [C++0x dcl.enum]p5:
11879 If not explicitly specified, the underlying type of a scoped
11880 enumeration type is int. */
11881 if (!underlying_type && scoped_enum_p)
11882 underlying_type = integer_type_node;
11884 if (underlying_type)
11885 underlying_type = cv_unqualified (underlying_type);
11887 /* If this is the real definition for a previous forward reference,
11888 fill in the contents in the same object that used to be the
11889 forward reference. */
11891 enumtype = lookup_and_check_tag (enum_type, name,
11892 /*tag_scope=*/ts_current,
11893 /*template_header_p=*/false);
11895 /* In case of a template_decl, the only check that should be deferred
11896 to instantiation time is the comparison of underlying types. */
11897 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11899 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11901 error_at (input_location, "scoped/unscoped mismatch "
11902 "in enum %q#T", enumtype);
11903 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11904 "previous definition here");
11905 enumtype = error_mark_node;
11907 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11909 error_at (input_location, "underlying type mismatch "
11910 "in enum %q#T", enumtype);
11911 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11912 "previous definition here");
11913 enumtype = error_mark_node;
11915 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11916 && !dependent_type_p (underlying_type)
11917 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11918 && !same_type_p (underlying_type,
11919 ENUM_UNDERLYING_TYPE (enumtype)))
11921 error_at (input_location, "different underlying type "
11922 "in enum %q#T", enumtype);
11923 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11924 "previous definition here");
11925 underlying_type = NULL_TREE;
11929 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11930 || processing_template_decl)
11932 /* In case of error, make a dummy enum to allow parsing to
11934 if (enumtype == error_mark_node)
11936 name = make_anon_name ();
11937 enumtype = NULL_TREE;
11940 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11941 of an opaque enum, or an opaque enum of an already defined
11942 enumeration (C++0x only).
11943 In any other case, it'll be NULL_TREE. */
11949 prevtype = enumtype;
11950 enumtype = cxx_make_type (ENUMERAL_TYPE);
11951 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11952 if (enumtype == error_mark_node)
11953 return error_mark_node;
11955 /* The enum is considered opaque until the opening '{' of the
11956 enumerator list. */
11957 SET_OPAQUE_ENUM_P (enumtype, true);
11958 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11961 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11963 if (underlying_type)
11965 if (CP_INTEGRAL_TYPE_P (underlying_type))
11967 copy_type_enum (enumtype, underlying_type);
11968 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11970 else if (dependent_type_p (underlying_type))
11971 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11973 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11974 underlying_type, enumtype);
11977 /* If into a template class, the returned enum is always the first
11978 declaration (opaque or not) seen. This way all the references to
11979 this type will be to the same declaration. The following ones are used
11980 only to check for definition errors. */
11981 if (prevtype && processing_template_decl)
11987 /* After processing and defining all the values of an enumeration type,
11988 install their decls in the enumeration type.
11989 ENUMTYPE is the type object. */
11992 finish_enum_value_list (tree enumtype)
11995 tree underlying_type;
11998 tree minnode, maxnode;
12001 bool fixed_underlying_type_p
12002 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12004 /* We built up the VALUES in reverse order. */
12005 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12007 /* For an enum defined in a template, just set the type of the values;
12008 all further processing is postponed until the template is
12009 instantiated. We need to set the type so that tsubst of a CONST_DECL
12011 if (processing_template_decl)
12013 for (values = TYPE_VALUES (enumtype);
12015 values = TREE_CHAIN (values))
12016 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12020 /* Determine the minimum and maximum values of the enumerators. */
12021 if (TYPE_VALUES (enumtype))
12023 minnode = maxnode = NULL_TREE;
12025 for (values = TYPE_VALUES (enumtype);
12027 values = TREE_CHAIN (values))
12029 decl = TREE_VALUE (values);
12031 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12032 each enumerator has the type of its enumeration. Prior to the
12033 closing brace, the type of each enumerator is the type of its
12034 initializing value. */
12035 TREE_TYPE (decl) = enumtype;
12037 /* Update the minimum and maximum values, if appropriate. */
12038 value = DECL_INITIAL (decl);
12039 if (value == error_mark_node)
12040 value = integer_zero_node;
12041 /* Figure out what the minimum and maximum values of the
12042 enumerators are. */
12044 minnode = maxnode = value;
12045 else if (tree_int_cst_lt (maxnode, value))
12047 else if (tree_int_cst_lt (value, minnode))
12054 If the enumerator-list is empty, the underlying type is as if
12055 the enumeration had a single enumerator with value 0. */
12056 minnode = maxnode = integer_zero_node;
12058 if (!fixed_underlying_type_p)
12060 /* Compute the number of bits require to represent all values of the
12061 enumeration. We must do this before the type of MINNODE and
12062 MAXNODE are transformed, since tree_int_cst_min_precision relies
12063 on the TREE_TYPE of the value it is passed. */
12064 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12065 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12066 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12067 int precision = MAX (lowprec, highprec);
12069 bool use_short_enum;
12071 /* Determine the underlying type of the enumeration.
12075 The underlying type of an enumeration is an integral type that
12076 can represent all the enumerator values defined in the
12077 enumeration. It is implementation-defined which integral type is
12078 used as the underlying type for an enumeration except that the
12079 underlying type shall not be larger than int unless the value of
12080 an enumerator cannot fit in an int or unsigned int.
12082 We use "int" or an "unsigned int" as the underlying type, even if
12083 a smaller integral type would work, unless the user has
12084 explicitly requested that we use the smallest possible type. The
12085 user can request that for all enumerations with a command line
12086 flag, or for just one enumeration with an attribute. */
12088 use_short_enum = flag_short_enums
12089 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12091 for (itk = (use_short_enum ? itk_char : itk_int);
12095 underlying_type = integer_types[itk];
12096 if (underlying_type != NULL_TREE
12097 && TYPE_PRECISION (underlying_type) >= precision
12098 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12101 if (itk == itk_none)
12105 IF no integral type can represent all the enumerator values, the
12106 enumeration is ill-formed. */
12107 error ("no integral type can represent all of the enumerator values "
12108 "for %qT", enumtype);
12109 precision = TYPE_PRECISION (long_long_integer_type_node);
12110 underlying_type = integer_types[itk_unsigned_long_long];
12115 The value of sizeof() applied to an enumeration type, an object
12116 of an enumeration type, or an enumerator, is the value of sizeof()
12117 applied to the underlying type. */
12118 copy_type_enum (enumtype, underlying_type);
12120 /* Compute the minimum and maximum values for the type.
12124 For an enumeration where emin is the smallest enumerator and emax
12125 is the largest, the values of the enumeration are the values of the
12126 underlying type in the range bmin to bmax, where bmin and bmax are,
12127 respectively, the smallest and largest values of the smallest bit-
12128 field that can store emin and emax. */
12130 /* The middle-end currently assumes that types with TYPE_PRECISION
12131 narrower than their underlying type are suitably zero or sign
12132 extended to fill their mode. Similarly, it assumes that the front
12133 end assures that a value of a particular type must be within
12134 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12136 We used to set these fields based on bmin and bmax, but that led
12137 to invalid assumptions like optimizing away bounds checking. So
12138 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12139 TYPE_MAX_VALUE to the values for the mode above and only restrict
12140 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12141 ENUM_UNDERLYING_TYPE (enumtype)
12142 = build_distinct_type_copy (underlying_type);
12143 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12144 set_min_and_max_values_for_integral_type
12145 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12147 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12148 if (flag_strict_enums)
12149 set_min_and_max_values_for_integral_type (enumtype, precision,
12153 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12155 /* Convert each of the enumerators to the type of the underlying
12156 type of the enumeration. */
12157 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12159 location_t saved_location;
12161 decl = TREE_VALUE (values);
12162 saved_location = input_location;
12163 input_location = DECL_SOURCE_LOCATION (decl);
12164 if (fixed_underlying_type_p)
12165 /* If the enumeration type has a fixed underlying type, we
12166 already checked all of the enumerator values. */
12167 value = DECL_INITIAL (decl);
12169 value = perform_implicit_conversion (underlying_type,
12170 DECL_INITIAL (decl),
12171 tf_warning_or_error);
12172 input_location = saved_location;
12174 /* Do not clobber shared ints. */
12175 value = copy_node (value);
12177 TREE_TYPE (value) = enumtype;
12178 DECL_INITIAL (decl) = value;
12181 /* Fix up all variant types of this enum type. */
12182 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12183 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12185 /* Finish debugging output for this type. */
12186 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12189 /* Finishes the enum type. This is called only the first time an
12190 enumeration is seen, be it opaque or odinary.
12191 ENUMTYPE is the type object. */
12194 finish_enum (tree enumtype)
12196 if (processing_template_decl)
12198 if (at_function_scope_p ())
12199 add_stmt (build_min (TAG_DEFN, enumtype));
12203 /* Here there should not be any variants of this type. */
12204 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12205 && !TYPE_NEXT_VARIANT (enumtype));
12208 /* Build and install a CONST_DECL for an enumeration constant of the
12209 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12210 LOC is the location of NAME.
12211 Assignment of sequential values by default is handled here. */
12214 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12220 /* If the VALUE was erroneous, pretend it wasn't there; that will
12221 result in the enum being assigned the next value in sequence. */
12222 if (value == error_mark_node)
12225 /* Remove no-op casts from the value. */
12227 STRIP_TYPE_NOPS (value);
12229 if (! processing_template_decl)
12231 /* Validate and default VALUE. */
12232 if (value != NULL_TREE)
12234 value = cxx_constant_value (value);
12236 if (TREE_CODE (value) == INTEGER_CST
12237 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12239 value = perform_integral_promotions (value);
12243 error ("enumerator value for %qD is not an integer constant", name);
12248 /* Default based on previous value. */
12249 if (value == NULL_TREE)
12251 if (TYPE_VALUES (enumtype))
12254 unsigned HOST_WIDE_INT lo;
12258 /* C++03 7.2/4: If no initializer is specified for the first
12259 enumerator, the type is an unspecified integral
12260 type. Otherwise the type is the same as the type of the
12261 initializing value of the preceding enumerator unless the
12262 incremented value is not representable in that type, in
12263 which case the type is an unspecified integral type
12264 sufficient to contain the incremented value. */
12265 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12266 if (error_operand_p (prev_value))
12267 value = error_mark_node;
12270 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12271 TREE_INT_CST_HIGH (prev_value),
12276 tree type = TREE_TYPE (prev_value);
12277 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12278 di.low = lo; di.high = hi;
12279 if (!double_int_fits_to_tree_p (type, di))
12282 for (itk = itk_int; itk != itk_none; itk++)
12284 type = integer_types[itk];
12285 if (type != NULL_TREE
12286 && (pos || !TYPE_UNSIGNED (type))
12287 && double_int_fits_to_tree_p (type, di))
12290 if (type && cxx_dialect < cxx0x
12291 && itk > itk_unsigned_long)
12292 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12293 incremented enumerator value is too large for %<unsigned long%>" : "\
12294 incremented enumerator value is too large for %<long%>");
12296 if (type == NULL_TREE)
12299 value = double_int_to_tree (type, di);
12304 error ("overflow in enumeration values at %qD", name);
12305 value = error_mark_node;
12310 value = integer_zero_node;
12313 /* Remove no-op casts from the value. */
12314 STRIP_TYPE_NOPS (value);
12316 /* If the underlying type of the enum is fixed, check whether
12317 the enumerator values fits in the underlying type. If it
12318 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12319 if (ENUM_UNDERLYING_TYPE (enumtype)
12321 && TREE_CODE (value) == INTEGER_CST
12322 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12324 error ("enumerator value %E is too large for underlying type %<%T%>",
12325 value, ENUM_UNDERLYING_TYPE (enumtype));
12327 /* Silently convert the value so that we can continue. */
12328 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12333 /* C++ associates enums with global, function, or class declarations. */
12334 context = current_scope ();
12336 /* Build the actual enumeration constant. Note that the enumeration
12337 constants have the underlying type of the enum (if it is fixed)
12338 or the type of their initializer (if the underlying type of the
12339 enum is not fixed):
12343 If the underlying type is fixed, the type of each enumerator
12344 prior to the closing brace is the underlying type; if the
12345 initializing value of an enumerator cannot be represented by
12346 the underlying type, the program is ill-formed. If the
12347 underlying type is not fixed, the type of each enumerator is
12348 the type of its initializing value.
12350 If the underlying type is not fixed, it will be computed by
12351 finish_enum and we will reset the type of this enumerator. Of
12352 course, if we're processing a template, there may be no value. */
12353 type = value ? TREE_TYPE (value) : NULL_TREE;
12355 if (context && context == current_class_type)
12356 /* This enum declaration is local to the class. We need the full
12357 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12358 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12360 /* It's a global enum, or it's local to a function. (Note local to
12361 a function could mean local to a class method. */
12362 decl = build_decl (loc, CONST_DECL, name, type);
12364 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12365 TREE_CONSTANT (decl) = 1;
12366 TREE_READONLY (decl) = 1;
12367 DECL_INITIAL (decl) = value;
12369 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12370 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12371 on the TYPE_FIELDS list for `S'. (That's so that you can say
12372 things like `S::i' later.) */
12373 finish_member_declaration (decl);
12377 /* Add this enumeration constant to the list for this type. */
12378 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12381 /* Look for an enumerator with the given NAME within the enumeration
12382 type ENUMTYPE. This routine is used primarily for qualified name
12383 lookup into an enumerator in C++0x, e.g.,
12385 enum class Color { Red, Green, Blue };
12387 Color color = Color::Red;
12389 Returns the value corresponding to the enumerator, or
12390 NULL_TREE if no such enumerator was found. */
12392 lookup_enumerator (tree enumtype, tree name)
12395 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12397 e = purpose_member (name, TYPE_VALUES (enumtype));
12398 return e? TREE_VALUE (e) : NULL_TREE;
12402 /* We're defining DECL. Make sure that its type is OK. */
12405 check_function_type (tree decl, tree current_function_parms)
12407 tree fntype = TREE_TYPE (decl);
12408 tree return_type = complete_type (TREE_TYPE (fntype));
12410 /* In a function definition, arg types must be complete. */
12411 require_complete_types_for_parms (current_function_parms);
12413 if (dependent_type_p (return_type))
12415 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12416 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12418 tree args = TYPE_ARG_TYPES (fntype);
12420 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12421 error ("return type %q#T is incomplete", return_type);
12423 error ("return type has Java class type %q#T", return_type);
12425 /* Make it return void instead. */
12426 if (TREE_CODE (fntype) == METHOD_TYPE)
12427 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12429 TREE_CHAIN (args));
12431 fntype = build_function_type (void_type_node, args);
12433 = build_exception_variant (fntype,
12434 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12435 fntype = (cp_build_type_attribute_variant
12436 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12437 TREE_TYPE (decl) = fntype;
12440 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12443 /* Create the FUNCTION_DECL for a function definition.
12444 DECLSPECS and DECLARATOR are the parts of the declaration;
12445 they describe the function's name and the type it returns,
12446 but twisted together in a fashion that parallels the syntax of C.
12448 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12449 DECLARATOR is really the DECL for the function we are about to
12450 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12451 indicating that the function is an inline defined in-class.
12453 This function creates a binding context for the function body
12454 as well as setting up the FUNCTION_DECL in current_function_decl.
12456 For C++, we must first check whether that datum makes any sense.
12457 For example, "class A local_a(1,2);" means that variable local_a
12458 is an aggregate of type A, which should have a constructor
12459 applied to it with the argument list [1, 2].
12461 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12462 or may be a BLOCK if the function has been defined previously
12463 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12464 error_mark_node if the function has never been defined, or
12465 a BLOCK if the function has been defined somewhere. */
12468 start_preparsed_function (tree decl1, tree attrs, int flags)
12470 tree ctype = NULL_TREE;
12473 int doing_friend = 0;
12474 cp_binding_level *bl;
12475 tree current_function_parms;
12476 struct c_fileinfo *finfo
12477 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12478 bool honor_interface;
12480 /* Sanity check. */
12481 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12482 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12484 fntype = TREE_TYPE (decl1);
12485 if (TREE_CODE (fntype) == METHOD_TYPE)
12486 ctype = TYPE_METHOD_BASETYPE (fntype);
12488 /* ISO C++ 11.4/5. A friend function defined in a class is in
12489 the (lexical) scope of the class in which it is defined. */
12490 if (!ctype && DECL_FRIEND_P (decl1))
12492 ctype = DECL_FRIEND_CONTEXT (decl1);
12494 /* CTYPE could be null here if we're dealing with a template;
12495 for example, `inline friend float foo()' inside a template
12496 will have no CTYPE set. */
12497 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12503 if (DECL_DECLARED_INLINE_P (decl1)
12504 && lookup_attribute ("noinline", attrs))
12505 warning (0, "inline function %q+D given attribute noinline", decl1);
12507 /* Handle gnu_inline attribute. */
12508 if (GNU_INLINE_P (decl1))
12510 DECL_EXTERNAL (decl1) = 1;
12511 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12512 DECL_INTERFACE_KNOWN (decl1) = 1;
12513 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12516 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12517 /* This is a constructor, we must ensure that any default args
12518 introduced by this definition are propagated to the clones
12519 now. The clones are used directly in overload resolution. */
12520 adjust_clone_args (decl1);
12522 /* Sometimes we don't notice that a function is a static member, and
12523 build a METHOD_TYPE for it. Fix that up now. */
12524 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12525 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12527 /* Set up current_class_type, and enter the scope of the class, if
12530 push_nested_class (ctype);
12531 else if (DECL_STATIC_FUNCTION_P (decl1))
12532 push_nested_class (DECL_CONTEXT (decl1));
12534 /* Now that we have entered the scope of the class, we must restore
12535 the bindings for any template parameters surrounding DECL1, if it
12536 is an inline member template. (Order is important; consider the
12537 case where a template parameter has the same name as a field of
12538 the class.) It is not until after this point that
12539 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12540 if (flags & SF_INCLASS_INLINE)
12541 maybe_begin_member_template_processing (decl1);
12543 /* Effective C++ rule 15. */
12545 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12546 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12547 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12549 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12550 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12551 if (!DECL_INITIAL (decl1))
12552 DECL_INITIAL (decl1) = error_mark_node;
12554 /* This function exists in static storage.
12555 (This does not mean `static' in the C sense!) */
12556 TREE_STATIC (decl1) = 1;
12558 /* We must call push_template_decl after current_class_type is set
12559 up. (If we are processing inline definitions after exiting a
12560 class scope, current_class_type will be NULL_TREE until set above
12561 by push_nested_class.) */
12562 if (processing_template_decl)
12564 /* FIXME: Handle error_mark_node more gracefully. */
12565 tree newdecl1 = push_template_decl (decl1);
12566 if (newdecl1 != error_mark_node)
12570 /* We are now in the scope of the function being defined. */
12571 current_function_decl = decl1;
12573 /* Save the parm names or decls from this function's declarator
12574 where store_parm_decls will find them. */
12575 current_function_parms = DECL_ARGUMENTS (decl1);
12577 /* Make sure the parameter and return types are reasonable. When
12578 you declare a function, these types can be incomplete, but they
12579 must be complete when you define the function. */
12580 check_function_type (decl1, current_function_parms);
12582 /* Build the return declaration for the function. */
12583 restype = TREE_TYPE (fntype);
12584 if (DECL_RESULT (decl1) == NULL_TREE)
12588 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12589 DECL_ARTIFICIAL (resdecl) = 1;
12590 DECL_IGNORED_P (resdecl) = 1;
12591 DECL_RESULT (decl1) = resdecl;
12593 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12596 /* Let the user know we're compiling this function. */
12597 announce_function (decl1);
12599 /* Record the decl so that the function name is defined.
12600 If we already have a decl for this name, and it is a FUNCTION_DECL,
12601 use the old decl. */
12602 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12604 /* A specialization is not used to guide overload resolution. */
12605 if (!DECL_FUNCTION_MEMBER_P (decl1)
12606 && !(DECL_USE_TEMPLATE (decl1) &&
12607 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12609 tree olddecl = pushdecl (decl1);
12611 if (olddecl == error_mark_node)
12612 /* If something went wrong when registering the declaration,
12613 use DECL1; we have to have a FUNCTION_DECL to use when
12614 parsing the body of the function. */
12618 /* Otherwise, OLDDECL is either a previous declaration
12619 of the same function or DECL1 itself. */
12621 if (warn_missing_declarations
12622 && olddecl == decl1
12623 && !DECL_MAIN_P (decl1)
12624 && TREE_PUBLIC (decl1)
12625 && !DECL_DECLARED_INLINE_P (decl1))
12629 /* Check whether DECL1 is in an anonymous
12631 for (context = DECL_CONTEXT (decl1);
12633 context = DECL_CONTEXT (context))
12635 if (TREE_CODE (context) == NAMESPACE_DECL
12636 && DECL_NAME (context) == NULL_TREE)
12640 if (context == NULL)
12641 warning (OPT_Wmissing_declarations,
12642 "no previous declaration for %q+D", decl1);
12650 /* We need to set the DECL_CONTEXT. */
12651 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12652 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12654 fntype = TREE_TYPE (decl1);
12656 /* If #pragma weak applies, mark the decl appropriately now.
12657 The pragma only applies to global functions. Because
12658 determining whether or not the #pragma applies involves
12659 computing the mangled name for the declaration, we cannot
12660 apply the pragma until after we have merged this declaration
12661 with any previous declarations; if the original declaration
12662 has a linkage specification, that specification applies to
12663 the definition as well, and may affect the mangled name. */
12664 if (DECL_FILE_SCOPE_P (decl1))
12665 maybe_apply_pragma_weak (decl1);
12668 /* Reset this in case the call to pushdecl changed it. */
12669 current_function_decl = decl1;
12671 gcc_assert (DECL_INITIAL (decl1));
12673 /* This function may already have been parsed, in which case just
12674 return; our caller will skip over the body without parsing. */
12675 if (DECL_INITIAL (decl1) != error_mark_node)
12678 /* Initialize RTL machinery. We cannot do this until
12679 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12680 even when processing a template; this is how we get
12681 CFUN set up, and our per-function variables initialized.
12682 FIXME factor out the non-RTL stuff. */
12683 bl = current_binding_level;
12684 allocate_struct_function (decl1, processing_template_decl);
12686 /* Initialize the language data structures. Whenever we start
12687 a new function, we destroy temporaries in the usual way. */
12688 cfun->language = ggc_alloc_cleared_language_function ();
12689 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12690 current_binding_level = bl;
12692 /* Start the statement-tree, start the tree now. */
12693 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12695 /* If we are (erroneously) defining a function that we have already
12696 defined before, wipe out what we knew before. */
12697 if (!DECL_PENDING_INLINE_P (decl1))
12698 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12700 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12702 /* We know that this was set up by `grokclassfn'. We do not
12703 wait until `store_parm_decls', since evil parse errors may
12704 never get us to that point. Here we keep the consistency
12705 between `current_class_type' and `current_class_ptr'. */
12706 tree t = DECL_ARGUMENTS (decl1);
12708 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12709 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12711 cp_function_chain->x_current_class_ref
12712 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12713 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12714 cp_function_chain->x_current_class_ptr = t;
12716 /* Constructors and destructors need to know whether they're "in
12717 charge" of initializing virtual base classes. */
12718 t = DECL_CHAIN (t);
12719 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12721 current_in_charge_parm = t;
12722 t = DECL_CHAIN (t);
12724 if (DECL_HAS_VTT_PARM_P (decl1))
12726 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12727 current_vtt_parm = t;
12731 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12732 /* Implicitly-defined methods (like the
12733 destructor for a class in which no destructor
12734 is explicitly declared) must not be defined
12735 until their definition is needed. So, we
12736 ignore interface specifications for
12737 compiler-generated functions. */
12738 && !DECL_ARTIFICIAL (decl1));
12740 if (processing_template_decl)
12741 /* Don't mess with interface flags. */;
12742 else if (DECL_INTERFACE_KNOWN (decl1))
12744 tree ctx = decl_function_context (decl1);
12746 if (DECL_NOT_REALLY_EXTERN (decl1))
12747 DECL_EXTERNAL (decl1) = 0;
12749 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12750 && TREE_PUBLIC (ctx))
12751 /* This is a function in a local class in an extern inline
12753 comdat_linkage (decl1);
12755 /* If this function belongs to an interface, it is public.
12756 If it belongs to someone else's interface, it is also external.
12757 This only affects inlines and template instantiations. */
12758 else if (!finfo->interface_unknown && honor_interface)
12760 if (DECL_DECLARED_INLINE_P (decl1)
12761 || DECL_TEMPLATE_INSTANTIATION (decl1))
12763 DECL_EXTERNAL (decl1)
12764 = (finfo->interface_only
12765 || (DECL_DECLARED_INLINE_P (decl1)
12766 && ! flag_implement_inlines
12767 && !DECL_VINDEX (decl1)));
12769 /* For WIN32 we also want to put these in linkonce sections. */
12770 maybe_make_one_only (decl1);
12773 DECL_EXTERNAL (decl1) = 0;
12774 DECL_INTERFACE_KNOWN (decl1) = 1;
12775 /* If this function is in an interface implemented in this file,
12776 make sure that the back end knows to emit this function
12778 if (!DECL_EXTERNAL (decl1))
12779 mark_needed (decl1);
12781 else if (finfo->interface_unknown && finfo->interface_only
12782 && honor_interface)
12784 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12785 interface, we will have both finfo->interface_unknown and
12786 finfo->interface_only set. In that case, we don't want to
12787 use the normal heuristics because someone will supply a
12788 #pragma implementation elsewhere, and deducing it here would
12789 produce a conflict. */
12790 comdat_linkage (decl1);
12791 DECL_EXTERNAL (decl1) = 0;
12792 DECL_INTERFACE_KNOWN (decl1) = 1;
12793 DECL_DEFER_OUTPUT (decl1) = 1;
12797 /* This is a definition, not a reference.
12798 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12799 if (!GNU_INLINE_P (decl1))
12800 DECL_EXTERNAL (decl1) = 0;
12802 if ((DECL_DECLARED_INLINE_P (decl1)
12803 || DECL_TEMPLATE_INSTANTIATION (decl1))
12804 && ! DECL_INTERFACE_KNOWN (decl1))
12805 DECL_DEFER_OUTPUT (decl1) = 1;
12807 DECL_INTERFACE_KNOWN (decl1) = 1;
12810 /* Determine the ELF visibility attribute for the function. We must not
12811 do this before calling "pushdecl", as we must allow "duplicate_decls"
12812 to merge any attributes appropriately. We also need to wait until
12814 if (!DECL_CLONED_FUNCTION_P (decl1))
12815 determine_visibility (decl1);
12817 begin_scope (sk_function_parms, decl1);
12821 if (DECL_DESTRUCTOR_P (decl1)
12822 || (DECL_CONSTRUCTOR_P (decl1)
12823 && targetm.cxx.cdtor_returns_this ()))
12825 cdtor_label = build_decl (input_location,
12826 LABEL_DECL, NULL_TREE, NULL_TREE);
12827 DECL_CONTEXT (cdtor_label) = current_function_decl;
12830 start_fname_decls ();
12832 store_parm_decls (current_function_parms);
12836 /* Like start_preparsed_function, except that instead of a
12837 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12839 Returns 1 on success. If the DECLARATOR is not suitable for a function
12840 (it defines a datum instead), we return 0, which tells
12841 yyparse to report a parse error. */
12844 start_function (cp_decl_specifier_seq *declspecs,
12845 const cp_declarator *declarator,
12850 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12851 if (decl1 == error_mark_node)
12853 /* If the declarator is not suitable for a function definition,
12854 cause a syntax error. */
12855 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12857 error ("invalid function declaration");
12861 if (DECL_MAIN_P (decl1))
12862 /* main must return int. grokfndecl should have corrected it
12863 (and issued a diagnostic) if the user got it wrong. */
12864 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12865 integer_type_node));
12867 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12872 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12876 use_eh_spec_block (tree fn)
12878 return (flag_exceptions && flag_enforce_eh_specs
12879 && !processing_template_decl
12880 && !type_throw_all_p (TREE_TYPE (fn))
12881 /* We insert the EH_SPEC_BLOCK only in the original
12882 function; then, it is copied automatically to the
12884 && !DECL_CLONED_FUNCTION_P (fn)
12885 /* Implicitly-generated constructors and destructors have
12886 exception specifications. However, those specifications
12887 are the union of the possible exceptions specified by the
12888 constructors/destructors for bases and members, so no
12889 unallowed exception will ever reach this function. By
12890 not creating the EH_SPEC_BLOCK we save a little memory,
12891 and we avoid spurious warnings about unreachable
12893 && !DECL_DEFAULTED_FN (fn));
12896 /* Store the parameter declarations into the current function declaration.
12897 This is called after parsing the parameter declarations, before
12898 digesting the body of the function.
12900 Also install to binding contour return value identifier, if any. */
12903 store_parm_decls (tree current_function_parms)
12905 tree fndecl = current_function_decl;
12908 /* This is a chain of any other decls that came in among the parm
12909 declarations. If a parm is declared with enum {foo, bar} x;
12910 then CONST_DECLs for foo and bar are put here. */
12911 tree nonparms = NULL_TREE;
12913 if (current_function_parms)
12915 /* This case is when the function was defined with an ANSI prototype.
12916 The parms already have decls, so we need not do anything here
12917 except record them as in effect
12918 and complain if any redundant old-style parm decls were written. */
12920 tree specparms = current_function_parms;
12923 /* Must clear this because it might contain TYPE_DECLs declared
12925 current_binding_level->names = NULL;
12927 /* If we're doing semantic analysis, then we'll call pushdecl
12928 for each of these. We must do them in reverse order so that
12929 they end in the correct forward order. */
12930 specparms = nreverse (specparms);
12932 for (parm = specparms; parm; parm = next)
12934 next = DECL_CHAIN (parm);
12935 if (TREE_CODE (parm) == PARM_DECL)
12937 if (DECL_NAME (parm) == NULL_TREE
12938 || TREE_CODE (parm) != VOID_TYPE)
12941 error ("parameter %qD declared void", parm);
12945 /* If we find an enum constant or a type tag,
12946 put it aside for the moment. */
12947 TREE_CHAIN (parm) = NULL_TREE;
12948 nonparms = chainon (nonparms, parm);
12952 /* Get the decls in their original chain order and record in the
12953 function. This is all and only the PARM_DECLs that were
12954 pushed into scope by the loop above. */
12955 DECL_ARGUMENTS (fndecl) = getdecls ();
12958 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12960 /* Now store the final chain of decls for the arguments
12961 as the decl-chain of the current lexical scope.
12962 Put the enumerators in as well, at the front so that
12963 DECL_ARGUMENTS is not modified. */
12964 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12966 if (use_eh_spec_block (current_function_decl))
12967 current_eh_spec_block = begin_eh_spec_block ();
12971 /* We have finished doing semantic analysis on DECL, but have not yet
12972 generated RTL for its body. Save away our current state, so that
12973 when we want to generate RTL later we know what to do. */
12976 save_function_data (tree decl)
12978 struct language_function *f;
12980 /* Save the language-specific per-function data so that we can
12981 get it back when we really expand this function. */
12982 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12985 f = ggc_alloc_language_function ();
12986 memcpy (f, cp_function_chain, sizeof (struct language_function));
12987 DECL_SAVED_FUNCTION_DATA (decl) = f;
12989 /* Clear out the bits we don't need. */
12990 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
12991 f->bindings = NULL;
12992 f->x_local_names = NULL;
12996 /* Set the return value of the constructor (if present). */
12999 finish_constructor_body (void)
13004 if (targetm.cxx.cdtor_returns_this ()
13005 && (! TYPE_FOR_JAVA (current_class_type)))
13007 /* Any return from a constructor will end up here. */
13008 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13010 val = DECL_ARGUMENTS (current_function_decl);
13011 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13012 DECL_RESULT (current_function_decl), val);
13013 /* Return the address of the object. */
13014 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13015 add_stmt (exprstmt);
13019 /* Do all the processing for the beginning of a destructor; set up the
13020 vtable pointers and cleanups for bases and members. */
13023 begin_destructor_body (void)
13025 tree compound_stmt;
13027 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13028 issued an error message. We still want to try to process the
13029 body of the function, but initialize_vtbl_ptrs will crash if
13030 TYPE_BINFO is NULL. */
13031 if (COMPLETE_TYPE_P (current_class_type))
13033 compound_stmt = begin_compound_stmt (0);
13034 /* Make all virtual function table pointers in non-virtual base
13035 classes point to CURRENT_CLASS_TYPE's virtual function
13037 initialize_vtbl_ptrs (current_class_ptr);
13038 finish_compound_stmt (compound_stmt);
13040 /* And insert cleanups for our bases and members so that they
13041 will be properly destroyed if we throw. */
13042 push_base_cleanups ();
13046 /* At the end of every destructor we generate code to delete the object if
13047 necessary. Do that now. */
13050 finish_destructor_body (void)
13054 /* Any return from a destructor will end up here; that way all base
13055 and member cleanups will be run when the function returns. */
13056 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13058 /* In a virtual destructor, we must call delete. */
13059 if (DECL_VIRTUAL_P (current_function_decl))
13062 tree virtual_size = cxx_sizeof (current_class_type);
13066 At the point of definition of a virtual destructor (including
13067 an implicit definition), non-placement operator delete shall
13068 be looked up in the scope of the destructor's class and if
13069 found shall be accessible and unambiguous. */
13070 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13072 /*global_p=*/false,
13073 /*placement=*/NULL_TREE,
13074 /*alloc_fn=*/NULL_TREE);
13076 if_stmt = begin_if_stmt ();
13077 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13078 current_in_charge_parm,
13081 finish_expr_stmt (exprstmt);
13082 finish_then_clause (if_stmt);
13083 finish_if_stmt (if_stmt);
13086 if (targetm.cxx.cdtor_returns_this ())
13090 val = DECL_ARGUMENTS (current_function_decl);
13091 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13092 DECL_RESULT (current_function_decl), val);
13093 /* Return the address of the object. */
13094 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13095 add_stmt (exprstmt);
13099 /* Do the necessary processing for the beginning of a function body, which
13100 in this case includes member-initializers, but not the catch clauses of
13101 a function-try-block. Currently, this means opening a binding level
13102 for the member-initializers (in a ctor), member cleanups (in a dtor),
13103 and capture proxies (in a lambda operator()). */
13106 begin_function_body (void)
13110 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13113 if (processing_template_decl)
13114 /* Do nothing now. */;
13116 /* Always keep the BLOCK node associated with the outermost pair of
13117 curly braces of a function. These are needed for correct
13118 operation of dwarfout.c. */
13119 keep_next_level (true);
13121 stmt = begin_compound_stmt (BCS_FN_BODY);
13123 if (processing_template_decl)
13124 /* Do nothing now. */;
13125 else if (DECL_DESTRUCTOR_P (current_function_decl))
13126 begin_destructor_body ();
13131 /* Do the processing for the end of a function body. Currently, this means
13132 closing out the cleanups for fully-constructed bases and members, and in
13133 the case of the destructor, deleting the object if desired. Again, this
13134 is only meaningful for [cd]tors, since they are the only functions where
13135 there is a significant distinction between the main body and any
13136 function catch clauses. Handling, say, main() return semantics here
13137 would be wrong, as flowing off the end of a function catch clause for
13138 main() would also need to return 0. */
13141 finish_function_body (tree compstmt)
13143 if (compstmt == NULL_TREE)
13146 /* Close the block. */
13147 finish_compound_stmt (compstmt);
13149 if (processing_template_decl)
13150 /* Do nothing now. */;
13151 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13152 finish_constructor_body ();
13153 else if (DECL_DESTRUCTOR_P (current_function_decl))
13154 finish_destructor_body ();
13157 /* Given a function, returns the BLOCK corresponding to the outermost level
13158 of curly braces, skipping the artificial block created for constructor
13162 outer_curly_brace_block (tree fndecl)
13164 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13165 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13166 /* Skip the artificial function body block. */
13167 block = BLOCK_SUBBLOCKS (block);
13171 /* If FNDECL is a class's key method, add the class to the list of
13172 keyed classes that should be emitted. */
13175 record_key_method_defined (tree fndecl)
13177 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13178 && DECL_VIRTUAL_P (fndecl)
13179 && !processing_template_decl)
13181 tree fnclass = DECL_CONTEXT (fndecl);
13182 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13183 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13187 /* Subroutine of finish_function.
13188 Save the body of constexpr functions for possible
13189 future compile time evaluation. */
13192 maybe_save_function_definition (tree fun)
13194 if (!processing_template_decl
13195 && DECL_DECLARED_CONSTEXPR_P (fun)
13196 && !DECL_CLONED_FUNCTION_P (fun))
13197 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13200 /* Finish up a function declaration and compile that function
13201 all the way to assembler language output. The free the storage
13202 for the function definition.
13204 FLAGS is a bitwise or of the following values:
13206 We just finished processing the body of an in-class inline
13207 function definition. (This processing will have taken place
13208 after the class definition is complete.) */
13211 finish_function (int flags)
13213 tree fndecl = current_function_decl;
13214 tree fntype, ctype = NULL_TREE;
13215 int inclass_inline = (flags & 2) != 0;
13217 /* When we get some parse errors, we can end up without a
13218 current_function_decl, so cope. */
13219 if (fndecl == NULL_TREE)
13220 return error_mark_node;
13222 if (c_dialect_objc ())
13223 objc_finish_function ();
13225 gcc_assert (!defer_mark_used_calls);
13226 defer_mark_used_calls = true;
13228 record_key_method_defined (fndecl);
13230 fntype = TREE_TYPE (fndecl);
13232 /* TREE_READONLY (fndecl) = 1;
13233 This caused &foo to be of type ptr-to-const-function
13234 which then got a warning when stored in a ptr-to-function variable. */
13236 gcc_assert (building_stmt_list_p ());
13237 /* The current function is being defined, so its DECL_INITIAL should
13238 be set, and unless there's a multiple definition, it should be
13239 error_mark_node. */
13240 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13242 /* For a cloned function, we've already got all the code we need;
13243 there's no need to add any extra bits. */
13244 if (!DECL_CLONED_FUNCTION_P (fndecl))
13246 if (DECL_MAIN_P (current_function_decl))
13248 /* Make it so that `main' always returns 0 by default (or
13251 finish_return_stmt (integer_one_node);
13253 finish_return_stmt (integer_zero_node);
13257 if (use_eh_spec_block (current_function_decl))
13258 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13259 (TREE_TYPE (current_function_decl)),
13260 current_eh_spec_block);
13263 /* If we're saving up tree structure, tie off the function now. */
13264 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13266 finish_fname_decls ();
13268 /* If this function can't throw any exceptions, remember that. */
13269 if (!processing_template_decl
13270 && !cp_function_chain->can_throw
13271 && !flag_non_call_exceptions
13272 && !decl_replaceable_p (fndecl))
13273 TREE_NOTHROW (fndecl) = 1;
13275 /* This must come after expand_function_end because cleanups might
13276 have declarations (from inline functions) that need to go into
13277 this function's blocks. */
13279 /* If the current binding level isn't the outermost binding level
13280 for this function, either there is a bug, or we have experienced
13281 syntax errors and the statement tree is malformed. */
13282 if (current_binding_level->kind != sk_function_parms)
13284 /* Make sure we have already experienced errors. */
13285 gcc_assert (errorcount);
13287 /* Throw away the broken statement tree and extra binding
13289 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13291 while (current_binding_level->kind != sk_function_parms)
13293 if (current_binding_level->kind == sk_class)
13294 pop_nested_class ();
13296 poplevel (0, 0, 0);
13299 poplevel (1, 0, 1);
13301 /* Statements should always be full-expressions at the outermost set
13302 of curly braces for a function. */
13303 gcc_assert (stmts_are_full_exprs_p ());
13305 /* Save constexpr function body before it gets munged by
13306 the NRV transformation. */
13307 maybe_save_function_definition (fndecl);
13309 /* Set up the named return value optimization, if we can. Candidate
13310 variables are selected in check_return_expr. */
13311 if (current_function_return_value)
13313 tree r = current_function_return_value;
13316 if (r != error_mark_node
13317 /* This is only worth doing for fns that return in memory--and
13318 simpler, since we don't have to worry about promoted modes. */
13319 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13320 /* Only allow this for variables declared in the outer scope of
13321 the function so we know that their lifetime always ends with a
13322 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13323 we were to do this optimization in tree-ssa. */
13324 && (outer = outer_curly_brace_block (fndecl))
13325 && chain_member (r, BLOCK_VARS (outer)))
13326 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13328 current_function_return_value = NULL_TREE;
13331 /* Remember that we were in class scope. */
13332 if (current_class_name)
13333 ctype = current_class_type;
13335 /* Must mark the RESULT_DECL as being in this function. */
13336 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13338 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13339 to the FUNCTION_DECL node itself. */
13340 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13342 /* Save away current state, if appropriate. */
13343 if (!processing_template_decl)
13344 save_function_data (fndecl);
13346 /* Complain if there's just no return statement. */
13347 if (warn_return_type
13348 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13349 && !dependent_type_p (TREE_TYPE (fntype))
13350 && !current_function_returns_value && !current_function_returns_null
13351 /* Don't complain if we abort or throw. */
13352 && !current_function_returns_abnormally
13353 /* Don't complain if we are declared noreturn. */
13354 && !TREE_THIS_VOLATILE (fndecl)
13355 && !DECL_NAME (DECL_RESULT (fndecl))
13356 && !TREE_NO_WARNING (fndecl)
13357 /* Structor return values (if any) are set by the compiler. */
13358 && !DECL_CONSTRUCTOR_P (fndecl)
13359 && !DECL_DESTRUCTOR_P (fndecl))
13361 warning (OPT_Wreturn_type,
13362 "no return statement in function returning non-void");
13363 TREE_NO_WARNING (fndecl) = 1;
13366 /* Store the end of the function, so that we get good line number
13367 info for the epilogue. */
13368 cfun->function_end_locus = input_location;
13370 /* Complain about parameters that are only set, but never otherwise used. */
13371 if (warn_unused_but_set_parameter
13372 && !processing_template_decl
13373 && errorcount == unused_but_set_errorcount
13374 && !DECL_CLONED_FUNCTION_P (fndecl))
13378 for (decl = DECL_ARGUMENTS (fndecl);
13380 decl = DECL_CHAIN (decl))
13381 if (TREE_USED (decl)
13382 && TREE_CODE (decl) == PARM_DECL
13383 && !DECL_READ_P (decl)
13384 && DECL_NAME (decl)
13385 && !DECL_ARTIFICIAL (decl)
13386 && !TREE_NO_WARNING (decl)
13387 && !DECL_IN_SYSTEM_HEADER (decl)
13388 && TREE_TYPE (decl) != error_mark_node
13389 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13390 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13391 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13392 warning (OPT_Wunused_but_set_parameter,
13393 "parameter %q+D set but not used", decl);
13394 unused_but_set_errorcount = errorcount;
13397 /* Complain about locally defined typedefs that are not used in this
13399 maybe_warn_unused_local_typedefs ();
13401 /* Genericize before inlining. */
13402 if (!processing_template_decl)
13404 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13405 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13406 cp_genericize (fndecl);
13407 /* Clear out the bits we don't need. */
13408 f->x_current_class_ptr = NULL;
13409 f->x_current_class_ref = NULL;
13410 f->x_eh_spec_block = NULL;
13411 f->x_in_charge_parm = NULL;
13412 f->x_vtt_parm = NULL;
13413 f->x_return_value = NULL;
13414 f->bindings = NULL;
13415 f->extern_decl_map = NULL;
13417 /* Clear out the bits we don't need. */
13418 local_names = NULL;
13420 /* We're leaving the context of this function, so zap cfun. It's still in
13421 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13423 current_function_decl = NULL;
13425 /* If this is an in-class inline definition, we may have to pop the
13426 bindings for the template parameters that we added in
13427 maybe_begin_member_template_processing when start_function was
13429 if (inclass_inline)
13430 maybe_end_member_template_processing ();
13432 /* Leave the scope of the class. */
13434 pop_nested_class ();
13439 current_function_decl = NULL_TREE;
13441 defer_mark_used_calls = false;
13442 if (deferred_mark_used_calls)
13447 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13449 VEC_free (tree, gc, deferred_mark_used_calls);
13455 /* Create the FUNCTION_DECL for a function definition.
13456 DECLSPECS and DECLARATOR are the parts of the declaration;
13457 they describe the return type and the name of the function,
13458 but twisted together in a fashion that parallels the syntax of C.
13460 This function creates a binding context for the function body
13461 as well as setting up the FUNCTION_DECL in current_function_decl.
13463 Returns a FUNCTION_DECL on success.
13465 If the DECLARATOR is not suitable for a function (it defines a datum
13466 instead), we return 0, which tells yyparse to report a parse error.
13468 May return void_type_node indicating that this method is actually
13469 a friend. See grokfield for more details.
13471 Came here with a `.pushlevel' .
13473 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13474 CHANGES TO CODE IN `grokfield'. */
13477 grokmethod (cp_decl_specifier_seq *declspecs,
13478 const cp_declarator *declarator, tree attrlist)
13480 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13483 if (fndecl == error_mark_node)
13484 return error_mark_node;
13486 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13488 error ("invalid member function declaration");
13489 return error_mark_node;
13493 cplus_decl_attributes (&fndecl, attrlist, 0);
13495 /* Pass friends other than inline friend functions back. */
13496 if (fndecl == void_type_node)
13499 if (DECL_IN_AGGR_P (fndecl))
13501 if (DECL_CLASS_SCOPE_P (fndecl))
13502 error ("%qD is already defined in class %qT", fndecl,
13503 DECL_CONTEXT (fndecl));
13504 return error_mark_node;
13507 check_template_shadow (fndecl);
13509 DECL_DECLARED_INLINE_P (fndecl) = 1;
13510 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13512 /* We process method specializations in finish_struct_1. */
13513 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13515 fndecl = push_template_decl (fndecl);
13516 if (fndecl == error_mark_node)
13520 if (! DECL_FRIEND_P (fndecl))
13522 if (DECL_CHAIN (fndecl))
13524 fndecl = copy_node (fndecl);
13525 TREE_CHAIN (fndecl) = NULL_TREE;
13529 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13531 DECL_IN_AGGR_P (fndecl) = 1;
13536 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13537 we can lay it out later, when and if its type becomes complete. */
13540 maybe_register_incomplete_var (tree var)
13542 gcc_assert (TREE_CODE (var) == VAR_DECL);
13544 /* Keep track of variables with incomplete types. */
13545 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13546 && DECL_EXTERNAL (var))
13548 tree inner_type = TREE_TYPE (var);
13550 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13551 inner_type = TREE_TYPE (inner_type);
13552 inner_type = TYPE_MAIN_VARIANT (inner_type);
13554 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13555 /* RTTI TD entries are created while defining the type_info. */
13556 || (TYPE_LANG_SPECIFIC (inner_type)
13557 && TYPE_BEING_DEFINED (inner_type)))
13560 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13562 iv->incomplete_type = inner_type;
13567 /* Called when a class type (given by TYPE) is defined. If there are
13568 any existing VAR_DECLs whose type has been completed by this
13569 declaration, update them now. */
13572 complete_vars (tree type)
13575 incomplete_var *iv;
13577 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13579 if (same_type_p (type, iv->incomplete_type))
13581 tree var = iv->decl;
13582 tree type = TREE_TYPE (var);
13583 /* Complete the type of the variable. The VAR_DECL itself
13584 will be laid out in expand_expr. */
13585 complete_type (type);
13586 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13587 /* Remove this entry from the list. */
13588 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13594 /* Check for pending declarations which may have abstract type. */
13595 complete_type_check_abstract (type);
13598 /* If DECL is of a type which needs a cleanup, build and return an
13599 expression to perform that cleanup here. Return NULL_TREE if no
13600 cleanup need be done. */
13603 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13609 /* Assume no cleanup is required. */
13610 cleanup = NULL_TREE;
13612 if (error_operand_p (decl))
13615 /* Handle "__attribute__((cleanup))". We run the cleanup function
13616 before the destructor since the destructor is what actually
13617 terminates the lifetime of the object. */
13618 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13625 /* Get the name specified by the user for the cleanup function. */
13626 id = TREE_VALUE (TREE_VALUE (attr));
13627 /* Look up the name to find the cleanup function to call. It is
13628 important to use lookup_name here because that is what is
13629 used in c-common.c:handle_cleanup_attribute when performing
13630 initial checks on the attribute. Note that those checks
13631 include ensuring that the function found is not an overloaded
13632 function, or an object with an overloaded call operator,
13633 etc.; we can rely on the fact that the function found is an
13634 ordinary FUNCTION_DECL. */
13635 fn = lookup_name (id);
13636 arg = build_address (decl);
13638 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13639 if (cleanup == error_mark_node)
13640 return error_mark_node;
13642 /* Handle ordinary C++ destructors. */
13643 type = TREE_TYPE (decl);
13644 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13646 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13647 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13648 && CLASSTYPE_VBASECLASSES (type));
13652 if (TREE_CODE (type) == ARRAY_TYPE)
13655 addr = build_address (decl);
13657 /* Optimize for space over speed here. */
13658 if (!has_vbases || flag_expensive_optimizations)
13659 flags |= LOOKUP_NONVIRTUAL;
13661 call = build_delete (TREE_TYPE (addr), addr,
13662 sfk_complete_destructor, flags, 0, complain);
13663 if (call == error_mark_node)
13664 cleanup = error_mark_node;
13666 cleanup = cp_build_compound_expr (cleanup, call, complain);
13674 /* When a stmt has been parsed, this function is called. */
13681 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13682 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13683 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13686 static_fn_type (tree memfntype)
13691 if (TYPE_PTRMEMFUNC_P (memfntype))
13692 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13693 if (POINTER_TYPE_P (memfntype)
13694 || TREE_CODE (memfntype) == FUNCTION_DECL)
13695 memfntype = TREE_TYPE (memfntype);
13696 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13698 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13699 args = TYPE_ARG_TYPES (memfntype);
13700 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13701 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13702 fntype = (cp_build_type_attribute_variant
13703 (fntype, TYPE_ATTRIBUTES (memfntype)));
13704 fntype = (build_exception_variant
13705 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13709 /* DECL was originally constructed as a non-static member function,
13710 but turned out to be static. Update it accordingly. */
13713 revert_static_member_fn (tree decl)
13715 tree stype = static_fn_type (decl);
13716 cp_cv_quals quals = type_memfn_quals (stype);
13718 if (quals != TYPE_UNQUALIFIED)
13719 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13721 TREE_TYPE (decl) = stype;
13723 if (DECL_ARGUMENTS (decl))
13724 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13725 DECL_STATIC_FUNCTION_P (decl) = 1;
13728 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13729 one of the language-independent trees. */
13731 enum cp_tree_node_structure_enum
13732 cp_tree_node_structure (union lang_tree_node * t)
13734 switch (TREE_CODE (&t->generic))
13736 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13737 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13738 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13739 case OVERLOAD: return TS_CP_OVERLOAD;
13740 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13741 case PTRMEM_CST: return TS_CP_PTRMEM;
13742 case BASELINK: return TS_CP_BASELINK;
13743 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13744 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13745 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13746 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13747 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13748 default: return TS_CP_GENERIC;
13752 /* Build the void_list_node (void_type_node having been created). */
13754 build_void_list_node (void)
13756 tree t = build_tree_list (NULL_TREE, void_type_node);
13761 cp_missing_noreturn_ok_p (tree decl)
13763 /* A missing noreturn is ok for the `main' function. */
13764 return DECL_MAIN_P (decl);
13767 /* Return the COMDAT group into which DECL should be placed. */
13770 cxx_comdat_group (tree decl)
13774 /* Virtual tables, construction virtual tables, and virtual table
13775 tables all go in a single COMDAT group, named after the primary
13777 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13778 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13779 /* For all other DECLs, the COMDAT group is the mangled name of the
13780 declaration itself. */
13783 while (DECL_THUNK_P (decl))
13785 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13786 into the same section as the target function. In that case
13787 we must return target's name. */
13788 tree target = THUNK_TARGET (decl);
13789 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13790 && DECL_SECTION_NAME (target) != NULL
13791 && DECL_ONE_ONLY (target))
13796 name = DECL_ASSEMBLER_NAME (decl);
13802 #include "gt-cp-decl.h"