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
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-pragma.h"
49 #include "diagnostic.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 BSP_VAR, /* variable */
60 BSP_PARM, /* parameter */
65 static tree grokparms (tree parmlist, tree *);
66 static const char *redeclaration_error_message (tree, tree);
68 static int decl_jump_unsafe (tree);
69 static void require_complete_types_for_parms (tree);
70 static int ambi_op_p (enum tree_code);
71 static int unary_op_p (enum tree_code);
72 static void push_local_name (tree);
73 static tree grok_reference_init (tree, tree, tree, tree *);
74 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
76 static void record_unknown_type (tree, const char *);
77 static tree builtin_function_1 (tree, tree, bool);
78 static tree build_library_fn_1 (tree, enum tree_code, tree);
79 static int member_function_or_else (tree, tree, enum overload_flags);
80 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
82 static void check_for_uninitialized_const_var (tree);
83 static hashval_t typename_hash (const void *);
84 static int typename_compare (const void *, const void *);
85 static tree local_variable_p_walkfn (tree *, int *, void *);
86 static tree record_builtin_java_type (const char *, int);
87 static const char *tag_name (enum tag_types);
88 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
89 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
90 static void maybe_deduce_size_from_array_init (tree, tree);
91 static void layout_var_decl (tree);
92 static tree check_initializer (tree, tree, int, tree *);
93 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
94 static void save_function_data (tree);
95 static void copy_type_enum (tree , tree);
96 static void check_function_type (tree, tree);
97 static void finish_constructor_body (void);
98 static void begin_destructor_body (void);
99 static void finish_destructor_body (void);
100 static void record_key_method_defined (tree);
101 static tree create_array_type_for_decl (tree, tree, tree);
102 static tree get_atexit_node (void);
103 static tree get_dso_handle_node (void);
104 static tree start_cleanup_fn (void);
105 static void end_cleanup_fn (void);
106 static tree cp_make_fname_decl (location_t, tree, int);
107 static void initialize_predefined_identifiers (void);
108 static tree check_special_function_return_type
109 (special_function_kind, tree, tree);
110 static tree push_cp_library_fn (enum tree_code, tree);
111 static tree build_cp_library_fn (tree, enum tree_code, tree);
112 static void store_parm_decls (tree);
113 static void initialize_local_var (tree, tree);
114 static void expand_static_init (tree, tree);
116 /* The following symbols are subsumed in the cp_global_trees array, and
117 listed here individually for documentation purposes.
120 tree wchar_decl_node;
122 tree vtable_entry_type;
123 tree delta_type_node;
124 tree __t_desc_type_node;
126 tree class_type_node;
127 tree unknown_type_node;
129 Array type `vtable_entry_type[]'
132 tree vtbl_ptr_type_node;
139 A FUNCTION_DECL which can call `abort'. Not necessarily the
140 one that the user will declare, but sufficient to be called
141 by routines that want to abort the program.
145 The FUNCTION_DECL for the default `::operator delete'.
147 tree global_delete_fndecl;
150 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
151 tree tinfo_var_id; */
153 tree cp_global_trees[CPTI_MAX];
155 /* Indicates that there is a type value in some namespace, although
156 that is not necessarily in scope at the moment. */
158 tree global_type_node;
160 /* The node that holds the "name" of the global scope. */
161 tree global_scope_name;
163 #define local_names cp_function_chain->x_local_names
165 /* A list of objects which have constructors or destructors
166 which reside in the global scope. The decl is stored in
167 the TREE_VALUE slot and the initializer is stored
168 in the TREE_PURPOSE slot. */
169 tree static_aggregates;
173 /* A node for the integer constant 2. */
175 tree integer_two_node;
177 /* Used only for jumps to as-yet undefined labels, since jumps to
178 defined labels can have their validity checked immediately. */
180 struct GTY(()) named_label_use_entry {
181 struct named_label_use_entry *next;
182 /* The binding level to which this entry is *currently* attached.
183 This is initially the binding level in which the goto appeared,
184 but is modified as scopes are closed. */
185 struct cp_binding_level *binding_level;
186 /* The head of the names list that was current when the goto appeared,
187 or the inner scope popped. These are the decls that will *not* be
188 skipped when jumping to the label. */
190 /* The location of the goto, for error reporting. */
191 location_t o_goto_locus;
192 /* True if an OpenMP structured block scope has been closed since
193 the goto appeared. This means that the branch from the label will
194 illegally exit an OpenMP scope. */
198 /* A list of all LABEL_DECLs in the function that have names. Here so
199 we can clear out their names' definitions at the end of the
200 function, and so we can check the validity of jumps to these labels. */
202 struct GTY(()) named_label_entry {
203 /* The decl itself. */
206 /* The binding level to which the label is *currently* attached.
207 This is initially set to the binding level in which the label
208 is defined, but is modified as scopes are closed. */
209 struct cp_binding_level *binding_level;
210 /* The head of the names list that was current when the label was
211 defined, or the inner scope popped. These are the decls that will
212 be skipped when jumping to the label. */
214 /* A vector of all decls from all binding levels that would be
215 crossed by a backward branch to the label. */
216 VEC(tree,gc) *bad_decls;
218 /* A list of uses of the label, before the label is defined. */
219 struct named_label_use_entry *uses;
221 /* The following bits are set after the label is defined, and are
222 updated as scopes are popped. They indicate that a backward jump
223 to the label will illegally enter a scope of the given flavor. */
229 #define named_labels cp_function_chain->x_named_labels
231 /* The number of function bodies which we are currently processing.
232 (Zero if we are at namespace scope, one inside the body of a
233 function, two inside the body of a function in a local class, etc.) */
236 /* To avoid unwanted recursion, finish_function defers all mark_used calls
237 encountered during its execution until it finishes. */
238 bool defer_mark_used_calls;
239 VEC(tree, gc) *deferred_mark_used_calls;
241 /* States indicating how grokdeclarator() should handle declspecs marked
242 with __attribute__((deprecated)). An object declared as
243 __attribute__((deprecated)) suppresses warnings of uses of other
245 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
248 /* A list of VAR_DECLs whose type was incomplete at the time the
249 variable was declared. */
251 typedef struct GTY(()) incomplete_var_d {
253 tree incomplete_type;
256 DEF_VEC_O(incomplete_var);
257 DEF_VEC_ALLOC_O(incomplete_var,gc);
259 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
261 /* Returns the kind of template specialization we are currently
262 processing, given that it's declaration contained N_CLASS_SCOPES
263 explicit scope qualifications. */
266 current_tmpl_spec_kind (int n_class_scopes)
268 int n_template_parm_scopes = 0;
269 int seen_specialization_p = 0;
270 int innermost_specialization_p = 0;
271 struct cp_binding_level *b;
273 /* Scan through the template parameter scopes. */
274 for (b = current_binding_level;
275 b->kind == sk_template_parms;
278 /* If we see a specialization scope inside a parameter scope,
279 then something is wrong. That corresponds to a declaration
282 template <class T> template <> ...
284 which is always invalid since [temp.expl.spec] forbids the
285 specialization of a class member template if the enclosing
286 class templates are not explicitly specialized as well. */
287 if (b->explicit_spec_p)
289 if (n_template_parm_scopes == 0)
290 innermost_specialization_p = 1;
292 seen_specialization_p = 1;
294 else if (seen_specialization_p == 1)
295 return tsk_invalid_member_spec;
297 ++n_template_parm_scopes;
300 /* Handle explicit instantiations. */
301 if (processing_explicit_instantiation)
303 if (n_template_parm_scopes != 0)
304 /* We've seen a template parameter list during an explicit
305 instantiation. For example:
307 template <class T> template void f(int);
309 This is erroneous. */
310 return tsk_invalid_expl_inst;
312 return tsk_expl_inst;
315 if (n_template_parm_scopes < n_class_scopes)
316 /* We've not seen enough template headers to match all the
317 specialized classes present. For example:
319 template <class T> void R<T>::S<T>::f(int);
321 This is invalid; there needs to be one set of template
322 parameters for each class. */
323 return tsk_insufficient_parms;
324 else if (n_template_parm_scopes == n_class_scopes)
325 /* We're processing a non-template declaration (even though it may
326 be a member of a template class.) For example:
328 template <class T> void S<T>::f(int);
330 The `class T' matches the `S<T>', leaving no template headers
331 corresponding to the `f'. */
333 else if (n_template_parm_scopes > n_class_scopes + 1)
334 /* We've got too many template headers. For example:
336 template <> template <class T> void f (T);
338 There need to be more enclosing classes. */
339 return tsk_excessive_parms;
341 /* This must be a template. It's of the form:
343 template <class T> template <class U> void S<T>::f(U);
345 This is a specialization if the innermost level was a
346 specialization; otherwise it's just a definition of the
348 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
351 /* Exit the current scope. */
359 /* When a label goes out of scope, check to see if that label was used
360 in a valid manner, and issue any appropriate warnings or errors. */
363 pop_label (tree label, tree old_value)
365 if (!processing_template_decl)
367 if (DECL_INITIAL (label) == NULL_TREE)
371 error ("label %q+D used but not defined", label);
372 location = input_location; /* FIXME want (input_filename, (line)0) */
373 /* Avoid crashing later. */
374 define_label (location, DECL_NAME (label));
377 warn_for_unused_label (label);
380 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
383 /* At the end of a function, all labels declared within the function
384 go out of scope. BLOCK is the top-level block for the
388 pop_labels_1 (void **slot, void *data)
390 struct named_label_entry *ent = (struct named_label_entry *) *slot;
391 tree block = (tree) data;
393 pop_label (ent->label_decl, NULL_TREE);
395 /* Put the labels into the "variables" of the top-level block,
396 so debugger can see them. */
397 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
398 BLOCK_VARS (block) = ent->label_decl;
400 htab_clear_slot (named_labels, slot);
406 pop_labels (tree block)
410 htab_traverse (named_labels, pop_labels_1, block);
415 /* At the end of a block with local labels, restore the outer definition. */
418 pop_local_label (tree label, tree old_value)
420 struct named_label_entry dummy;
423 pop_label (label, old_value);
425 dummy.label_decl = label;
426 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
427 htab_clear_slot (named_labels, slot);
430 /* The following two routines are used to interface to Objective-C++.
431 The binding level is purposely treated as an opaque type. */
434 objc_get_current_scope (void)
436 return current_binding_level;
439 /* The following routine is used by the NeXT-style SJLJ exceptions;
440 variables get marked 'volatile' so as to not be clobbered by
441 _setjmp()/_longjmp() calls. All variables in the current scope,
442 as well as parent scopes up to (but not including) ENCLOSING_BLK
443 shall be thusly marked. */
446 objc_mark_locals_volatile (void *enclosing_blk)
448 struct cp_binding_level *scope;
450 for (scope = current_binding_level;
451 scope && scope != enclosing_blk;
452 scope = scope->level_chain)
456 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
457 objc_volatilize_decl (decl);
459 /* Do not climb up past the current function. */
460 if (scope->kind == sk_function_parms)
465 /* Update data for defined and undefined labels when leaving a scope. */
468 poplevel_named_label_1 (void **slot, void *data)
470 struct named_label_entry *ent = (struct named_label_entry *) *slot;
471 struct cp_binding_level *bl = (struct cp_binding_level *) data;
472 struct cp_binding_level *obl = bl->level_chain;
474 if (ent->binding_level == bl)
478 for (decl = ent->names_in_scope; decl; decl = DECL_CHAIN (decl))
479 if (decl_jump_unsafe (decl))
480 VEC_safe_push (tree, gc, ent->bad_decls, decl);
482 ent->binding_level = obl;
483 ent->names_in_scope = obl->names;
487 ent->in_try_scope = true;
490 ent->in_catch_scope = true;
493 ent->in_omp_scope = true;
501 struct named_label_use_entry *use;
503 for (use = ent->uses; use ; use = use->next)
504 if (use->binding_level == bl)
506 use->binding_level = obl;
507 use->names_in_scope = obl->names;
508 if (bl->kind == sk_omp)
509 use->in_omp_scope = true;
516 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
517 when errors were reported, except for -Werror-unused-but-set-*. */
518 static int unused_but_set_errorcount;
520 /* Exit a binding level.
521 Pop the level off, and restore the state of the identifier-decl mappings
522 that were in effect when this level was entered.
524 If KEEP == 1, this level had explicit declarations, so
525 and create a "block" (a BLOCK node) for the level
526 to record its declarations and subblocks for symbol table output.
528 If FUNCTIONBODY is nonzero, this level is the body of a function,
529 so create a block as if KEEP were set and also clear out all
532 If REVERSE is nonzero, reverse the order of decls before putting
533 them into the BLOCK. */
536 poplevel (int keep, int reverse, int functionbody)
539 /* The chain of decls was accumulated in reverse order.
540 Put it into forward order, just for cleanliness. */
545 int leaving_for_scope;
548 cp_label_binding *label_bind;
550 timevar_push (TV_NAME_LOOKUP);
555 gcc_assert (current_binding_level->kind != sk_class);
557 if (current_binding_level->kind == sk_cleanup)
559 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
561 gcc_assert (!VEC_length(cp_class_binding,
562 current_binding_level->class_shadowed));
564 /* We used to use KEEP == 2 to indicate that the new block should go
565 at the beginning of the list of blocks at this binding level,
566 rather than the end. This hack is no longer used. */
567 gcc_assert (keep == 0 || keep == 1);
569 if (current_binding_level->keep)
572 /* Any uses of undefined labels, and any defined labels, now operate
573 under constraints of next binding contour. */
574 if (cfun && !functionbody && named_labels)
575 htab_traverse (named_labels, poplevel_named_label_1,
576 current_binding_level);
578 /* Get the decls in the order they were written.
579 Usually current_binding_level->names is in reverse order.
580 But parameter decls were previously put in forward order. */
583 current_binding_level->names
584 = decls = nreverse (current_binding_level->names);
586 decls = current_binding_level->names;
588 /* If there were any declarations or structure tags in that level,
589 or if this level is a function body,
590 create a BLOCK to record them for the life of this function. */
592 if (keep == 1 || functionbody)
593 block = make_node (BLOCK);
594 if (block != NULL_TREE)
596 BLOCK_VARS (block) = decls;
597 BLOCK_SUBBLOCKS (block) = subblocks;
600 /* In each subblock, record that this is its superior. */
602 for (link = subblocks; link; link = BLOCK_CHAIN (link))
603 BLOCK_SUPERCONTEXT (link) = block;
605 /* We still support the old for-scope rules, whereby the variables
606 in a for-init statement were in scope after the for-statement
607 ended. We only use the new rules if flag_new_for_scope is
610 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
612 /* Before we remove the declarations first check for unused variables. */
613 if ((warn_unused_variable || warn_unused_but_set_variable)
614 && !processing_template_decl)
615 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
616 if (TREE_CODE (decl) == VAR_DECL
617 && (! TREE_USED (decl) || !DECL_READ_P (decl))
618 && ! DECL_IN_SYSTEM_HEADER (decl)
619 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
621 if (! TREE_USED (decl))
622 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
623 else if (DECL_CONTEXT (decl) == current_function_decl
624 && TREE_TYPE (decl) != error_mark_node
625 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
626 && errorcount == unused_but_set_errorcount
627 && (!CLASS_TYPE_P (TREE_TYPE (decl))
628 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
630 warning (OPT_Wunused_but_set_variable,
631 "variable %q+D set but not used", decl);
632 unused_but_set_errorcount = errorcount;
636 /* Remove declarations for all the DECLs in this level. */
637 for (link = decls; link; link = TREE_CHAIN (link))
639 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
642 tree name = DECL_NAME (link);
646 ob = outer_binding (name,
647 IDENTIFIER_BINDING (name),
650 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
652 ns_binding = NULL_TREE;
654 if (ob && ob->scope == current_binding_level->level_chain)
655 /* We have something like:
660 and we are leaving the `for' scope. There's no reason to
661 keep the binding of the inner `i' in this case. */
662 pop_binding (name, link);
663 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
664 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
665 /* Here, we have something like:
673 We must pop the for-scope binding so we know what's a
674 type and what isn't. */
675 pop_binding (name, link);
678 /* Mark this VAR_DECL as dead so that we can tell we left it
679 there only for backward compatibility. */
680 DECL_DEAD_FOR_LOCAL (link) = 1;
682 /* Keep track of what should have happened when we
683 popped the binding. */
686 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
687 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
690 /* Add it to the list of dead variables in the next
691 outermost binding to that we can remove these when we
692 leave that binding. */
693 VEC_safe_push (tree, gc,
694 current_binding_level->level_chain->dead_vars_from_for,
697 /* Although we don't pop the cxx_binding, we do clear
698 its SCOPE since the scope is going away now. */
699 IDENTIFIER_BINDING (name)->scope
700 = current_binding_level->level_chain;
707 /* Remove the binding. */
710 if (TREE_CODE (decl) == TREE_LIST)
711 decl = TREE_VALUE (decl);
714 if (TREE_CODE (name) == OVERLOAD)
715 name = OVL_FUNCTION (name);
717 gcc_assert (DECL_P (name));
718 pop_binding (DECL_NAME (name), decl);
722 /* Remove declarations for any `for' variables from inner scopes
723 that we kept around. */
724 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
726 pop_binding (DECL_NAME (decl), decl);
728 /* Restore the IDENTIFIER_TYPE_VALUEs. */
729 for (link = current_binding_level->type_shadowed;
730 link; link = TREE_CHAIN (link))
731 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
733 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
734 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
735 current_binding_level->shadowed_labels,
737 pop_local_label (label_bind->label, label_bind->prev_value);
739 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
740 list if a `using' declaration put them there. The debugging
741 back ends won't understand OVERLOAD, so we remove them here.
742 Because the BLOCK_VARS are (temporarily) shared with
743 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
744 popped all the bindings. */
749 for (d = &BLOCK_VARS (block); *d; )
751 if (TREE_CODE (*d) == TREE_LIST)
752 *d = TREE_CHAIN (*d);
754 d = &DECL_CHAIN (*d);
758 /* If the level being exited is the top level of a function,
759 check over all the labels. */
762 /* Since this is the top level block of a function, the vars are
763 the function's parameters. Don't leave them in the BLOCK
764 because they are found in the FUNCTION_DECL instead. */
765 BLOCK_VARS (block) = 0;
769 kind = current_binding_level->kind;
770 if (kind == sk_cleanup)
774 /* If this is a temporary binding created for a cleanup, then we'll
775 have pushed a statement list level. Pop that, create a new
776 BIND_EXPR for the block, and insert it into the stream. */
777 stmt = pop_stmt_list (current_binding_level->statement_list);
778 stmt = c_build_bind_expr (input_location, block, stmt);
785 /* The current function is being defined, so its DECL_INITIAL
786 should be error_mark_node. */
787 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
788 DECL_INITIAL (current_function_decl) = block;
791 current_binding_level->blocks
792 = chainon (current_binding_level->blocks, block);
794 /* If we did not make a block for the level just exited,
795 any blocks made for inner levels
796 (since they cannot be recorded as subblocks in that level)
797 must be carried forward so they will later become subblocks
798 of something else. */
800 current_binding_level->blocks
801 = chainon (current_binding_level->blocks, subblocks);
803 /* Each and every BLOCK node created here in `poplevel' is important
804 (e.g. for proper debugging information) so if we created one
805 earlier, mark it as "used". */
807 TREE_USED (block) = 1;
809 /* All temporary bindings created for cleanups are popped silently. */
810 if (kind == sk_cleanup)
813 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
816 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
817 itself, calling F for each. The DATA is passed to F as well. */
820 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
823 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
825 result |= (*f) (name_space, data);
827 for (; current; current = DECL_CHAIN (current))
828 result |= walk_namespaces_r (current, f, data);
833 /* Walk all the namespaces, calling F for each. The DATA is passed to
837 walk_namespaces (walk_namespaces_fn f, void* data)
839 return walk_namespaces_r (global_namespace, f, data);
842 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
843 DATA is non-NULL, this is the last time we will call
844 wrapup_global_declarations for this NAMESPACE. */
847 wrapup_globals_for_namespace (tree name_space, void* data)
849 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
850 VEC(tree,gc) *statics = level->static_decls;
851 tree *vec = VEC_address (tree, statics);
852 int len = VEC_length (tree, statics);
853 int last_time = (data != 0);
857 check_global_declarations (vec, len);
858 emit_debug_global_declarations (vec, len);
862 /* Write out any globals that need to be output. */
863 return wrapup_global_declarations (vec, len);
867 /* In C++, you don't have to write `struct S' to refer to `S'; you
868 can just use `S'. We accomplish this by creating a TYPE_DECL as
869 if the user had written `typedef struct S S'. Create and return
870 the TYPE_DECL for TYPE. */
873 create_implicit_typedef (tree name, tree type)
877 decl = build_decl (input_location, TYPE_DECL, name, type);
878 DECL_ARTIFICIAL (decl) = 1;
879 /* There are other implicit type declarations, like the one *within*
880 a class that allows you to write `S::S'. We must distinguish
882 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
883 TYPE_NAME (type) = decl;
884 TYPE_STUB_DECL (type) = decl;
889 /* Remember a local name for name-mangling purposes. */
892 push_local_name (tree decl)
897 timevar_push (TV_NAME_LOOKUP);
899 name = DECL_NAME (decl);
901 nelts = VEC_length (tree, local_names);
902 for (i = 0; i < nelts; i++)
904 t = VEC_index (tree, local_names, i);
905 if (DECL_NAME (t) == name)
907 if (!DECL_LANG_SPECIFIC (decl))
908 retrofit_lang_decl (decl);
909 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
910 if (DECL_LANG_SPECIFIC (t))
911 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
913 DECL_DISCRIMINATOR (decl) = 1;
915 VEC_replace (tree, local_names, i, decl);
916 timevar_pop (TV_NAME_LOOKUP);
921 VEC_safe_push (tree, gc, local_names, decl);
922 timevar_pop (TV_NAME_LOOKUP);
925 /* Subroutine of duplicate_decls: return truthvalue of whether
926 or not types of these decls match.
928 For C++, we must compare the parameter list so that `int' can match
929 `int&' in a parameter position, but `int&' is not confused with
933 decls_match (tree newdecl, tree olddecl)
937 if (newdecl == olddecl)
940 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
941 /* If the two DECLs are not even the same kind of thing, we're not
942 interested in their types. */
945 if (TREE_CODE (newdecl) == FUNCTION_DECL)
947 tree f1 = TREE_TYPE (newdecl);
948 tree f2 = TREE_TYPE (olddecl);
949 tree p1 = TYPE_ARG_TYPES (f1);
950 tree p2 = TYPE_ARG_TYPES (f2);
952 /* Specializations of different templates are different functions
953 even if they have the same type. */
954 tree t1 = (DECL_USE_TEMPLATE (newdecl)
955 ? DECL_TI_TEMPLATE (newdecl)
957 tree t2 = (DECL_USE_TEMPLATE (olddecl)
958 ? DECL_TI_TEMPLATE (olddecl)
963 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
964 && ! (DECL_EXTERN_C_P (newdecl)
965 && DECL_EXTERN_C_P (olddecl)))
968 #ifdef NO_IMPLICIT_EXTERN_C
969 /* A new declaration doesn't match a built-in one unless it
970 is also extern "C". */
971 if (DECL_IS_BUILTIN (olddecl)
972 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
976 if (TREE_CODE (f1) != TREE_CODE (f2))
979 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
981 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
982 && (DECL_BUILT_IN (olddecl)
983 #ifndef NO_IMPLICIT_EXTERN_C
984 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
985 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
989 types_match = self_promoting_args_p (p1);
990 if (p1 == void_list_node)
991 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
993 #ifndef NO_IMPLICIT_EXTERN_C
994 else if (p1 == NULL_TREE
995 && (DECL_EXTERN_C_P (olddecl)
996 && DECL_IN_SYSTEM_HEADER (olddecl)
997 && !DECL_CLASS_SCOPE_P (olddecl))
998 && (DECL_EXTERN_C_P (newdecl)
999 && DECL_IN_SYSTEM_HEADER (newdecl)
1000 && !DECL_CLASS_SCOPE_P (newdecl)))
1002 types_match = self_promoting_args_p (p2);
1003 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1007 types_match = compparms (p1, p2);
1012 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1014 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1015 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1018 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1019 DECL_TEMPLATE_PARMS (olddecl)))
1022 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1023 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1024 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1026 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1027 DECL_TEMPLATE_RESULT (newdecl));
1031 /* Need to check scope for variable declaration (VAR_DECL).
1032 For typedef (TYPE_DECL), scope is ignored. */
1033 if (TREE_CODE (newdecl) == VAR_DECL
1034 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1036 Two declarations for an object with C language linkage
1037 with the same name (ignoring the namespace that qualify
1038 it) that appear in different namespace scopes refer to
1040 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1043 if (TREE_TYPE (newdecl) == error_mark_node)
1044 types_match = TREE_TYPE (olddecl) == error_mark_node;
1045 else if (TREE_TYPE (olddecl) == NULL_TREE)
1046 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1047 else if (TREE_TYPE (newdecl) == NULL_TREE)
1050 types_match = comptypes (TREE_TYPE (newdecl),
1051 TREE_TYPE (olddecl),
1052 COMPARE_REDECLARATION);
1058 /* If NEWDECL is `static' and an `extern' was seen previously,
1059 warn about it. OLDDECL is the previous declaration.
1061 Note that this does not apply to the C++ case of declaring
1062 a variable `extern const' and then later `const'.
1064 Don't complain about built-in functions, since they are beyond
1065 the user's control. */
1068 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1070 if (TREE_CODE (newdecl) == TYPE_DECL
1071 || TREE_CODE (newdecl) == TEMPLATE_DECL
1072 || TREE_CODE (newdecl) == CONST_DECL
1073 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1076 /* Don't get confused by static member functions; that's a different
1078 if (TREE_CODE (newdecl) == FUNCTION_DECL
1079 && DECL_STATIC_FUNCTION_P (newdecl))
1082 /* If the old declaration was `static', or the new one isn't, then
1083 then everything is OK. */
1084 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1087 /* It's OK to declare a builtin function as `static'. */
1088 if (TREE_CODE (olddecl) == FUNCTION_DECL
1089 && DECL_ARTIFICIAL (olddecl))
1092 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1093 permerror (input_location, "previous declaration of %q+D", olddecl);
1096 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1097 function templates. If their exception specifications do not
1098 match, issue a diagnostic. */
1101 check_redeclaration_exception_specification (tree new_decl,
1106 tree new_exceptions;
1107 tree old_exceptions;
1109 new_type = TREE_TYPE (new_decl);
1110 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1111 old_type = TREE_TYPE (old_decl);
1112 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1116 If any declaration of a function has an exception-specification,
1117 all declarations, including the definition and an explicit
1118 specialization, of that function shall have an
1119 exception-specification with the same set of type-ids. */
1120 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1121 && ! DECL_IS_BUILTIN (old_decl)
1123 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1125 error ("declaration of %qF has a different exception specifier",
1127 error ("from previous declaration %q+F", old_decl);
1131 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1132 Otherwise issue diagnostics. */
1135 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1137 old_decl = STRIP_TEMPLATE (old_decl);
1138 new_decl = STRIP_TEMPLATE (new_decl);
1139 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1140 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1142 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1143 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1145 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1147 /* Hide a built-in declaration. */
1148 DECL_DECLARED_CONSTEXPR_P (old_decl)
1149 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1152 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1153 error ("from previous declaration %q+D", old_decl);
1157 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1158 && lookup_attribute ("gnu_inline", \
1159 DECL_ATTRIBUTES (fn)))
1161 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1162 If the redeclaration is invalid, a diagnostic is issued, and the
1163 error_mark_node is returned. Otherwise, OLDDECL is returned.
1165 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1168 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1171 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1173 unsigned olddecl_uid = DECL_UID (olddecl);
1174 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1175 int new_defines_function = 0;
1176 tree new_template_info;
1178 if (newdecl == olddecl)
1181 types_match = decls_match (newdecl, olddecl);
1183 /* If either the type of the new decl or the type of the old decl is an
1184 error_mark_node, then that implies that we have already issued an
1185 error (earlier) for some bogus type specification, and in that case,
1186 it is rather pointless to harass the user with yet more error message
1187 about the same declaration, so just pretend the types match here. */
1188 if (TREE_TYPE (newdecl) == error_mark_node
1189 || TREE_TYPE (olddecl) == error_mark_node)
1190 return error_mark_node;
1192 if (DECL_P (olddecl)
1193 && TREE_CODE (newdecl) == FUNCTION_DECL
1194 && TREE_CODE (olddecl) == FUNCTION_DECL
1195 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1197 if (DECL_DECLARED_INLINE_P (newdecl)
1198 && DECL_UNINLINABLE (newdecl)
1199 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1200 /* Already warned elsewhere. */;
1201 else if (DECL_DECLARED_INLINE_P (olddecl)
1202 && DECL_UNINLINABLE (olddecl)
1203 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1204 /* Already warned. */;
1205 else if (DECL_DECLARED_INLINE_P (newdecl)
1206 && DECL_UNINLINABLE (olddecl)
1207 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1209 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1211 warning (OPT_Wattributes, "previous declaration of %q+D "
1212 "with attribute noinline", olddecl);
1214 else if (DECL_DECLARED_INLINE_P (olddecl)
1215 && DECL_UNINLINABLE (newdecl)
1216 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1218 warning (OPT_Wattributes, "function %q+D redeclared with "
1219 "attribute noinline", newdecl);
1220 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1225 /* Check for redeclaration and other discrepancies. */
1226 if (TREE_CODE (olddecl) == FUNCTION_DECL
1227 && DECL_ARTIFICIAL (olddecl))
1229 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1230 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1232 /* Avoid warnings redeclaring built-ins which have not been
1233 explicitly declared. */
1234 if (DECL_ANTICIPATED (olddecl))
1237 /* If you declare a built-in or predefined function name as static,
1238 the old definition is overridden, but optionally warn this was a
1239 bad choice of name. */
1240 if (! TREE_PUBLIC (newdecl))
1242 warning (OPT_Wshadow,
1243 DECL_BUILT_IN (olddecl)
1244 ? G_("shadowing built-in function %q#D")
1245 : G_("shadowing library function %q#D"), olddecl);
1246 /* Discard the old built-in function. */
1249 /* If the built-in is not ansi, then programs can override
1250 it even globally without an error. */
1251 else if (! DECL_BUILT_IN (olddecl))
1252 warning (0, "library function %q#D redeclared as non-function %q#D",
1256 error ("declaration of %q#D", newdecl);
1257 error ("conflicts with built-in declaration %q#D",
1262 else if (!types_match)
1264 /* Avoid warnings redeclaring built-ins which have not been
1265 explicitly declared. */
1266 if (DECL_ANTICIPATED (olddecl))
1268 /* Deal with fileptr_type_node. FILE type is not known
1269 at the time we create the builtins. */
1272 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1273 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1275 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1278 else if (TREE_VALUE (t2) == fileptr_type_node)
1280 tree t = TREE_VALUE (t1);
1282 if (TREE_CODE (t) == POINTER_TYPE
1283 && TYPE_NAME (TREE_TYPE (t))
1284 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1285 == get_identifier ("FILE")
1286 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1288 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1290 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1291 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1292 types_match = decls_match (newdecl, olddecl);
1294 return duplicate_decls (newdecl, olddecl,
1296 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1299 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1302 else if ((DECL_EXTERN_C_P (newdecl)
1303 && DECL_EXTERN_C_P (olddecl))
1304 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1305 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1307 /* A near match; override the builtin. */
1309 if (TREE_PUBLIC (newdecl))
1311 warning (0, "new declaration %q#D", newdecl);
1312 warning (0, "ambiguates built-in declaration %q#D",
1316 warning (OPT_Wshadow,
1317 DECL_BUILT_IN (olddecl)
1318 ? G_("shadowing built-in function %q#D")
1319 : G_("shadowing library function %q#D"), olddecl);
1322 /* Discard the old built-in function. */
1325 /* Replace the old RTL to avoid problems with inlining. */
1326 COPY_DECL_RTL (newdecl, olddecl);
1328 /* Even if the types match, prefer the new declarations type for
1329 built-ins which have not been explicitly declared, for
1330 exception lists, etc... */
1331 else if (DECL_IS_BUILTIN (olddecl))
1333 tree type = TREE_TYPE (newdecl);
1334 tree attribs = (*targetm.merge_type_attributes)
1335 (TREE_TYPE (olddecl), type);
1337 type = cp_build_type_attribute_variant (type, attribs);
1338 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1341 /* If a function is explicitly declared "throw ()", propagate that to
1342 the corresponding builtin. */
1343 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1344 && DECL_ANTICIPATED (olddecl)
1345 && TREE_NOTHROW (newdecl)
1346 && !TREE_NOTHROW (olddecl)
1347 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1348 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1350 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1352 /* Whether or not the builtin can throw exceptions has no
1353 bearing on this declarator. */
1354 TREE_NOTHROW (olddecl) = 0;
1356 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1358 /* If a builtin function is redeclared as `static', merge
1359 the declarations, but make the original one static. */
1360 DECL_THIS_STATIC (olddecl) = 1;
1361 TREE_PUBLIC (olddecl) = 0;
1363 /* Make the old declaration consistent with the new one so
1364 that all remnants of the builtin-ness of this function
1365 will be banished. */
1366 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1367 COPY_DECL_RTL (newdecl, olddecl);
1370 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1372 /* C++ Standard, 3.3, clause 4:
1373 "[Note: a namespace name or a class template name must be unique
1374 in its declarative region (7.3.2, clause 14). ]" */
1375 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1376 && TREE_CODE (newdecl) != NAMESPACE_DECL
1377 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1378 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1379 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1380 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1382 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1383 && TREE_CODE (newdecl) != TYPE_DECL)
1384 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1385 && TREE_CODE (olddecl) != TYPE_DECL))
1387 /* We do nothing special here, because C++ does such nasty
1388 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1389 get shadowed, and know that if we need to find a TYPE_DECL
1390 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1391 slot of the identifier. */
1395 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1396 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1397 || (TREE_CODE (olddecl) == FUNCTION_DECL
1398 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1402 error ("%q#D redeclared as different kind of symbol", newdecl);
1403 if (TREE_CODE (olddecl) == TREE_LIST)
1404 olddecl = TREE_VALUE (olddecl);
1405 error ("previous declaration of %q+#D", olddecl);
1407 return error_mark_node;
1409 else if (!types_match)
1411 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1412 /* These are certainly not duplicate declarations; they're
1413 from different scopes. */
1416 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1418 /* The name of a class template may not be declared to refer to
1419 any other template, class, function, object, namespace, value,
1420 or type in the same scope. */
1421 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1422 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1424 error ("declaration of template %q#D", newdecl);
1425 error ("conflicts with previous declaration %q+#D", olddecl);
1427 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1428 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1429 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1430 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1431 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1432 DECL_TEMPLATE_PARMS (olddecl))
1433 /* Template functions can be disambiguated by
1435 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1436 TREE_TYPE (TREE_TYPE (olddecl))))
1438 error ("new declaration %q#D", newdecl);
1439 error ("ambiguates old declaration %q+#D", olddecl);
1443 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1445 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1447 error ("declaration of C function %q#D conflicts with",
1449 error ("previous declaration %q+#D here", olddecl);
1451 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1452 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1454 error ("new declaration %q#D", newdecl);
1455 error ("ambiguates old declaration %q+#D", olddecl);
1456 return error_mark_node;
1463 error ("conflicting declaration %q#D", newdecl);
1464 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1465 return error_mark_node;
1468 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1469 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1470 && (!DECL_TEMPLATE_INFO (newdecl)
1471 || (DECL_TI_TEMPLATE (newdecl)
1472 != DECL_TI_TEMPLATE (olddecl))))
1473 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1474 && (!DECL_TEMPLATE_INFO (olddecl)
1475 || (DECL_TI_TEMPLATE (olddecl)
1476 != DECL_TI_TEMPLATE (newdecl))))))
1477 /* It's OK to have a template specialization and a non-template
1478 with the same type, or to have specializations of two
1479 different templates with the same type. Note that if one is a
1480 specialization, and the other is an instantiation of the same
1481 template, that we do not exit at this point. That situation
1482 can occur if we instantiate a template class, and then
1483 specialize one of its methods. This situation is valid, but
1484 the declarations must be merged in the usual way. */
1486 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1487 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1488 && !DECL_USE_TEMPLATE (newdecl))
1489 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1490 && !DECL_USE_TEMPLATE (olddecl))))
1491 /* One of the declarations is a template instantiation, and the
1492 other is not a template at all. That's OK. */
1494 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1496 /* In [namespace.alias] we have:
1498 In a declarative region, a namespace-alias-definition can be
1499 used to redefine a namespace-alias declared in that declarative
1500 region to refer only to the namespace to which it already
1503 Therefore, if we encounter a second alias directive for the same
1504 alias, we can just ignore the second directive. */
1505 if (DECL_NAMESPACE_ALIAS (newdecl)
1506 && (DECL_NAMESPACE_ALIAS (newdecl)
1507 == DECL_NAMESPACE_ALIAS (olddecl)))
1509 /* [namespace.alias]
1511 A namespace-name or namespace-alias shall not be declared as
1512 the name of any other entity in the same declarative region.
1513 A namespace-name defined at global scope shall not be
1514 declared as the name of any other entity in any global scope
1516 error ("declaration of namespace %qD conflicts with", newdecl);
1517 error ("previous declaration of namespace %q+D here", olddecl);
1518 return error_mark_node;
1522 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1525 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1526 if (DECL_NAME (olddecl) != NULL_TREE)
1527 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1528 ? "%q+#D previously defined here"
1529 : "%q+#D previously declared here", olddecl);
1530 return error_mark_node;
1532 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1533 && DECL_INITIAL (olddecl) != NULL_TREE
1534 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1535 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1537 /* Prototype decl follows defn w/o prototype. */
1538 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1539 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1540 "follows non-prototype definition here");
1542 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1543 || TREE_CODE (olddecl) == VAR_DECL)
1544 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1547 If two declarations of the same function or object
1548 specify different linkage-specifications ..., the program
1549 is ill-formed.... Except for functions with C++ linkage,
1550 a function declaration without a linkage specification
1551 shall not precede the first linkage specification for
1552 that function. A function can be declared without a
1553 linkage specification after an explicit linkage
1554 specification has been seen; the linkage explicitly
1555 specified in the earlier declaration is not affected by
1556 such a function declaration.
1558 DR 563 raises the question why the restrictions on
1559 functions should not also apply to objects. Older
1560 versions of G++ silently ignore the linkage-specification
1568 which is clearly wrong. Therefore, we now treat objects
1570 if (current_lang_depth () == 0)
1572 /* There is no explicit linkage-specification, so we use
1573 the linkage from the previous declaration. */
1574 if (!DECL_LANG_SPECIFIC (newdecl))
1575 retrofit_lang_decl (newdecl);
1576 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1580 error ("previous declaration of %q+#D with %qL linkage",
1581 olddecl, DECL_LANGUAGE (olddecl));
1582 error ("conflicts with new declaration with %qL linkage",
1583 DECL_LANGUAGE (newdecl));
1587 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1589 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1591 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1592 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1595 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1596 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1598 for (; t1 && t1 != void_list_node;
1599 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1600 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1602 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1605 permerror (input_location, "default argument given for parameter %d of %q#D",
1607 permerror (input_location, "after previous specification in %q+#D", olddecl);
1611 error ("default argument given for parameter %d of %q#D",
1613 error ("after previous specification in %q+#D",
1620 /* Do not merge an implicit typedef with an explicit one. In:
1624 typedef class A A __attribute__ ((foo));
1626 the attribute should apply only to the typedef. */
1627 if (TREE_CODE (olddecl) == TYPE_DECL
1628 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1629 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1632 /* If new decl is `static' and an `extern' was seen previously,
1634 warn_extern_redeclared_static (newdecl, olddecl);
1636 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1637 return error_mark_node;
1639 /* We have committed to returning 1 at this point. */
1640 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1642 /* Now that functions must hold information normally held
1643 by field decls, there is extra work to do so that
1644 declaration information does not get destroyed during
1646 if (DECL_VINDEX (olddecl))
1647 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1648 if (DECL_CONTEXT (olddecl))
1649 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1650 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1651 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1652 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1653 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1654 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1655 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1656 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1657 SET_OVERLOADED_OPERATOR_CODE
1658 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1659 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1661 /* Optionally warn about more than one declaration for the same
1662 name, but don't warn about a function declaration followed by a
1664 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1665 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1666 /* Don't warn about extern decl followed by definition. */
1667 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1668 /* Don't warn about friends, let add_friend take care of it. */
1669 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1671 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1672 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1675 if (DECL_DELETED_FN (newdecl))
1677 error ("deleted definition of %qD", newdecl);
1678 error ("after previous declaration %q+D", olddecl);
1682 /* Deal with C++: must preserve virtual function table size. */
1683 if (TREE_CODE (olddecl) == TYPE_DECL)
1685 tree newtype = TREE_TYPE (newdecl);
1686 tree oldtype = TREE_TYPE (olddecl);
1688 if (newtype != error_mark_node && oldtype != error_mark_node
1689 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1690 CLASSTYPE_FRIEND_CLASSES (newtype)
1691 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1693 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1696 /* Copy all the DECL_... slots specified in the new decl
1697 except for any that we copy here from the old type. */
1698 DECL_ATTRIBUTES (newdecl)
1699 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1701 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1705 old_result = DECL_TEMPLATE_RESULT (olddecl);
1706 new_result = DECL_TEMPLATE_RESULT (newdecl);
1707 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1708 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1709 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1710 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1712 DECL_ATTRIBUTES (old_result)
1713 = (*targetm.merge_decl_attributes) (old_result, new_result);
1715 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1717 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1718 && DECL_INITIAL (new_result))
1720 if (DECL_INITIAL (old_result))
1721 DECL_UNINLINABLE (old_result) = 1;
1723 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1724 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1725 DECL_NOT_REALLY_EXTERN (old_result)
1726 = DECL_NOT_REALLY_EXTERN (new_result);
1727 DECL_INTERFACE_KNOWN (old_result)
1728 = DECL_INTERFACE_KNOWN (new_result);
1729 DECL_DECLARED_INLINE_P (old_result)
1730 = DECL_DECLARED_INLINE_P (new_result);
1731 DECL_DISREGARD_INLINE_LIMITS (old_result)
1732 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1737 DECL_DECLARED_INLINE_P (old_result)
1738 |= DECL_DECLARED_INLINE_P (new_result);
1739 DECL_DISREGARD_INLINE_LIMITS (old_result)
1740 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1741 check_redeclaration_exception_specification (newdecl, olddecl);
1745 /* If the new declaration is a definition, update the file and
1746 line information on the declaration, and also make
1747 the old declaration the same definition. */
1748 if (DECL_INITIAL (new_result) != NULL_TREE)
1750 DECL_SOURCE_LOCATION (olddecl)
1751 = DECL_SOURCE_LOCATION (old_result)
1752 = DECL_SOURCE_LOCATION (newdecl);
1753 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1754 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1757 DECL_ARGUMENTS (old_result)
1758 = DECL_ARGUMENTS (new_result);
1759 for (parm = DECL_ARGUMENTS (old_result); parm;
1760 parm = DECL_CHAIN (parm))
1761 DECL_CONTEXT (parm) = old_result;
1770 /* Automatically handles default parameters. */
1771 tree oldtype = TREE_TYPE (olddecl);
1774 /* Merge the data types specified in the two decls. */
1775 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1777 /* If merge_types produces a non-typedef type, just use the old type. */
1778 if (TREE_CODE (newdecl) == TYPE_DECL
1779 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1782 if (TREE_CODE (newdecl) == VAR_DECL)
1784 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1785 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1786 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1787 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1788 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1789 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1791 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1792 if (DECL_LANG_SPECIFIC (olddecl)
1793 && CP_DECL_THREADPRIVATE_P (olddecl))
1795 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1796 if (!DECL_LANG_SPECIFIC (newdecl))
1797 retrofit_lang_decl (newdecl);
1799 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1800 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1804 /* Do this after calling `merge_types' so that default
1805 parameters don't confuse us. */
1806 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1807 check_redeclaration_exception_specification (newdecl, olddecl);
1808 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1810 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1811 check_default_args (newdecl);
1813 /* Lay the type out, unless already done. */
1814 if (! same_type_p (newtype, oldtype)
1815 && TREE_TYPE (newdecl) != error_mark_node
1816 && !(processing_template_decl && uses_template_parms (newdecl)))
1817 layout_type (TREE_TYPE (newdecl));
1819 if ((TREE_CODE (newdecl) == VAR_DECL
1820 || TREE_CODE (newdecl) == PARM_DECL
1821 || TREE_CODE (newdecl) == RESULT_DECL
1822 || TREE_CODE (newdecl) == FIELD_DECL
1823 || TREE_CODE (newdecl) == TYPE_DECL)
1824 && !(processing_template_decl && uses_template_parms (newdecl)))
1825 layout_decl (newdecl, 0);
1827 /* Merge the type qualifiers. */
1828 if (TREE_READONLY (newdecl))
1829 TREE_READONLY (olddecl) = 1;
1830 if (TREE_THIS_VOLATILE (newdecl))
1831 TREE_THIS_VOLATILE (olddecl) = 1;
1832 if (TREE_NOTHROW (newdecl))
1833 TREE_NOTHROW (olddecl) = 1;
1835 /* Merge deprecatedness. */
1836 if (TREE_DEPRECATED (newdecl))
1837 TREE_DEPRECATED (olddecl) = 1;
1839 /* Preserve function specific target and optimization options */
1840 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1842 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1843 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1844 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1845 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1847 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1848 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1849 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1850 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1853 /* Merge the initialization information. */
1854 if (DECL_INITIAL (newdecl) == NULL_TREE
1855 && DECL_INITIAL (olddecl) != NULL_TREE)
1857 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1858 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1859 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1861 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1862 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1866 /* Merge the section attribute.
1867 We want to issue an error if the sections conflict but that must be
1868 done later in decl_attributes since we are called before attributes
1870 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1871 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1873 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1875 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1876 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1877 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1878 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1879 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1880 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1881 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1882 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1883 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1884 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1885 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1886 /* Keep the old RTL. */
1887 COPY_DECL_RTL (olddecl, newdecl);
1889 else if (TREE_CODE (newdecl) == VAR_DECL
1890 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1892 /* Keep the old RTL. We cannot keep the old RTL if the old
1893 declaration was for an incomplete object and the new
1894 declaration is not since many attributes of the RTL will
1896 COPY_DECL_RTL (olddecl, newdecl);
1899 /* If cannot merge, then use the new type and qualifiers,
1900 and don't preserve the old rtl. */
1903 /* Clean out any memory we had of the old declaration. */
1904 tree oldstatic = value_member (olddecl, static_aggregates);
1906 TREE_VALUE (oldstatic) = error_mark_node;
1908 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1909 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1910 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1911 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1914 /* Merge the storage class information. */
1915 merge_weak (newdecl, olddecl);
1917 if (DECL_ONE_ONLY (olddecl))
1918 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1920 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1921 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1922 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1923 if (! DECL_EXTERNAL (olddecl))
1924 DECL_EXTERNAL (newdecl) = 0;
1926 new_template_info = NULL_TREE;
1927 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1929 bool new_redefines_gnu_inline = false;
1931 if (new_defines_function
1932 && ((DECL_INTERFACE_KNOWN (olddecl)
1933 && TREE_CODE (olddecl) == FUNCTION_DECL)
1934 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1935 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1936 == FUNCTION_DECL))))
1940 if (TREE_CODE (fn) == TEMPLATE_DECL)
1941 fn = DECL_TEMPLATE_RESULT (olddecl);
1943 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1946 if (!new_redefines_gnu_inline)
1948 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1949 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1950 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1952 DECL_TEMPLATE_INSTANTIATED (newdecl)
1953 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1954 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1956 /* If the OLDDECL is an instantiation and/or specialization,
1957 then the NEWDECL must be too. But, it may not yet be marked
1958 as such if the caller has created NEWDECL, but has not yet
1959 figured out that it is a redeclaration. */
1960 if (!DECL_USE_TEMPLATE (newdecl))
1961 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1963 /* Don't really know how much of the language-specific
1964 values we should copy from old to new. */
1965 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1966 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1967 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1968 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1970 if (LANG_DECL_HAS_MIN (newdecl))
1972 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1973 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1974 if (DECL_TEMPLATE_INFO (newdecl))
1975 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1976 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1978 /* Only functions have these fields. */
1979 if (TREE_CODE (newdecl) == FUNCTION_DECL
1980 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1982 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1983 olddecl_friend = DECL_FRIEND_P (olddecl);
1984 hidden_friend = (DECL_ANTICIPATED (olddecl)
1985 && DECL_HIDDEN_FRIEND_P (olddecl)
1986 && newdecl_is_friend);
1987 DECL_BEFRIENDING_CLASSES (newdecl)
1988 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1989 DECL_BEFRIENDING_CLASSES (olddecl));
1990 /* DECL_THUNKS is only valid for virtual functions,
1991 otherwise it is a DECL_FRIEND_CONTEXT. */
1992 if (DECL_VIRTUAL_P (newdecl))
1993 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1995 /* Only variables have this field. */
1996 else if (TREE_CODE (newdecl) == VAR_DECL
1997 && VAR_HAD_UNKNOWN_BOUND (olddecl))
1998 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2001 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2005 /* Merge parameter attributes. */
2006 tree oldarg, newarg;
2007 for (oldarg = DECL_ARGUMENTS(olddecl),
2008 newarg = DECL_ARGUMENTS(newdecl);
2010 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2011 DECL_ATTRIBUTES (newarg)
2012 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2013 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2016 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2017 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2019 /* If newdecl is not a specialization, then it is not a
2020 template-related function at all. And that means that we
2021 should have exited above, returning 0. */
2022 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2024 if (DECL_ODR_USED (olddecl))
2025 /* From [temp.expl.spec]:
2027 If a template, a member template or the member of a class
2028 template is explicitly specialized then that
2029 specialization shall be declared before the first use of
2030 that specialization that would cause an implicit
2031 instantiation to take place, in every translation unit in
2032 which such a use occurs. */
2033 error ("explicit specialization of %qD after first use",
2036 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2038 /* Don't propagate visibility from the template to the
2039 specialization here. We'll do that in determine_visibility if
2041 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2043 /* [temp.expl.spec/14] We don't inline explicit specialization
2044 just because the primary template says so. */
2046 else if (new_defines_function && DECL_INITIAL (olddecl))
2048 /* Never inline re-defined extern inline functions.
2049 FIXME: this could be better handled by keeping both
2050 function as separate declarations. */
2051 DECL_UNINLINABLE (newdecl) = 1;
2055 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2056 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2058 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2060 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2061 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2063 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2064 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2065 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2066 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2069 /* Preserve abstractness on cloned [cd]tors. */
2070 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2072 /* Update newdecl's parms to point at olddecl. */
2073 for (parm = DECL_ARGUMENTS (newdecl); parm;
2074 parm = DECL_CHAIN (parm))
2075 DECL_CONTEXT (parm) = olddecl;
2079 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2080 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2081 COPY_DECL_RTL (newdecl, olddecl);
2083 if (! types_match || new_defines_function)
2085 /* These need to be copied so that the names are available.
2086 Note that if the types do match, we'll preserve inline
2087 info and other bits, but if not, we won't. */
2088 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2089 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2091 if (new_defines_function)
2092 /* If defining a function declared with other language
2093 linkage, use the previously declared language linkage. */
2094 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2095 else if (types_match)
2097 /* If redeclaring a builtin function, and not a definition,
2098 it stays built in. */
2099 if (DECL_BUILT_IN (olddecl))
2101 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2102 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2103 /* If we're keeping the built-in definition, keep the rtl,
2104 regardless of declaration matches. */
2105 COPY_DECL_RTL (olddecl, newdecl);
2108 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2109 /* Don't clear out the arguments if we're just redeclaring a
2111 if (DECL_ARGUMENTS (olddecl))
2112 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2115 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2116 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2118 /* Now preserve various other info from the definition. */
2119 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2120 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2121 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2122 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2124 /* Warn about conflicting visibility specifications. */
2125 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2126 && DECL_VISIBILITY_SPECIFIED (newdecl)
2127 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2129 warning_at (input_location, OPT_Wattributes,
2130 "%q+D: visibility attribute ignored because it", newdecl);
2131 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2132 "conflicts with previous declaration here");
2134 /* Choose the declaration which specified visibility. */
2135 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2137 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2138 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2140 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2141 so keep this behavior. */
2142 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2144 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2145 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2147 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2148 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2149 if (TREE_CODE (newdecl) == FIELD_DECL)
2150 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2152 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2153 with that from NEWDECL below. */
2154 if (DECL_LANG_SPECIFIC (olddecl))
2156 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2157 != DECL_LANG_SPECIFIC (newdecl));
2158 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2161 /* Merge the USED information. */
2162 if (TREE_USED (olddecl))
2163 TREE_USED (newdecl) = 1;
2164 else if (TREE_USED (newdecl))
2165 TREE_USED (olddecl) = 1;
2166 if (TREE_CODE (newdecl) == VAR_DECL)
2168 if (DECL_READ_P (olddecl))
2169 DECL_READ_P (newdecl) = 1;
2170 else if (DECL_READ_P (newdecl))
2171 DECL_READ_P (olddecl) = 1;
2173 if (DECL_PRESERVE_P (olddecl))
2174 DECL_PRESERVE_P (newdecl) = 1;
2175 else if (DECL_PRESERVE_P (newdecl))
2176 DECL_PRESERVE_P (olddecl) = 1;
2178 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2182 function_size = sizeof (struct tree_decl_common);
2184 memcpy ((char *) olddecl + sizeof (struct tree_common),
2185 (char *) newdecl + sizeof (struct tree_common),
2186 function_size - sizeof (struct tree_common));
2188 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2189 (char *) newdecl + sizeof (struct tree_decl_common),
2190 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2191 if (new_template_info)
2192 /* If newdecl is a template instantiation, it is possible that
2193 the following sequence of events has occurred:
2195 o A friend function was declared in a class template. The
2196 class template was instantiated.
2198 o The instantiation of the friend declaration was
2199 recorded on the instantiation list, and is newdecl.
2201 o Later, however, instantiate_class_template called pushdecl
2202 on the newdecl to perform name injection. But, pushdecl in
2203 turn called duplicate_decls when it discovered that another
2204 declaration of a global function with the same name already
2207 o Here, in duplicate_decls, we decided to clobber newdecl.
2209 If we're going to do that, we'd better make sure that
2210 olddecl, and not newdecl, is on the list of
2211 instantiations so that if we try to do the instantiation
2212 again we won't get the clobbered declaration. */
2213 reregister_specialization (newdecl,
2219 size_t size = tree_code_size (TREE_CODE (olddecl));
2220 memcpy ((char *) olddecl + sizeof (struct tree_common),
2221 (char *) newdecl + sizeof (struct tree_common),
2222 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2223 switch (TREE_CODE (olddecl))
2233 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2234 (char *) newdecl + sizeof (struct tree_decl_common),
2235 size - sizeof (struct tree_decl_common)
2236 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2240 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2241 (char *) newdecl + sizeof (struct tree_decl_common),
2242 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2243 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2247 DECL_UID (olddecl) = olddecl_uid;
2249 DECL_FRIEND_P (olddecl) = 1;
2252 DECL_ANTICIPATED (olddecl) = 1;
2253 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2256 /* NEWDECL contains the merged attribute lists.
2257 Update OLDDECL to be the same. */
2258 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2260 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2261 so that encode_section_info has a chance to look at the new decl
2262 flags and attributes. */
2263 if (DECL_RTL_SET_P (olddecl)
2264 && (TREE_CODE (olddecl) == FUNCTION_DECL
2265 || (TREE_CODE (olddecl) == VAR_DECL
2266 && TREE_STATIC (olddecl))))
2267 make_decl_rtl (olddecl);
2269 /* The NEWDECL will no longer be needed. Because every out-of-class
2270 declaration of a member results in a call to duplicate_decls,
2271 freeing these nodes represents in a significant savings. */
2277 /* Return zero if the declaration NEWDECL is valid
2278 when the declaration OLDDECL (assumed to be for the same name)
2279 has already been seen.
2280 Otherwise return an error message format string with a %s
2281 where the identifier should go. */
2284 redeclaration_error_message (tree newdecl, tree olddecl)
2286 if (TREE_CODE (newdecl) == TYPE_DECL)
2288 /* Because C++ can put things into name space for free,
2289 constructs like "typedef struct foo { ... } foo"
2290 would look like an erroneous redeclaration. */
2291 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2294 return G_("redefinition of %q#D");
2296 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2298 /* If this is a pure function, its olddecl will actually be
2299 the original initialization to `0' (which we force to call
2300 abort()). Don't complain about redefinition in this case. */
2301 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2302 && DECL_INITIAL (olddecl) == NULL_TREE)
2305 /* If both functions come from different namespaces, this is not
2306 a redeclaration - this is a conflict with a used function. */
2307 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2308 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2309 && ! decls_match (olddecl, newdecl))
2310 return G_("%qD conflicts with used function");
2312 /* We'll complain about linkage mismatches in
2313 warn_extern_redeclared_static. */
2315 /* Defining the same name twice is no good. */
2316 if (DECL_INITIAL (olddecl) != NULL_TREE
2317 && DECL_INITIAL (newdecl) != NULL_TREE)
2319 if (DECL_NAME (olddecl) == NULL_TREE)
2320 return G_("%q#D not declared in class");
2321 else if (!GNU_INLINE_P (olddecl)
2322 || GNU_INLINE_P (newdecl))
2323 return G_("redefinition of %q#D");
2326 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2328 bool olda = GNU_INLINE_P (olddecl);
2329 bool newa = GNU_INLINE_P (newdecl);
2334 return G_("%q+D redeclared inline with "
2335 "%<gnu_inline%> attribute");
2337 return G_("%q+D redeclared inline without "
2338 "%<gnu_inline%> attribute");
2344 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2348 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2350 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2351 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2352 return G_("redefinition of %q#D");
2356 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2357 || (DECL_TEMPLATE_RESULT (newdecl)
2358 == DECL_TEMPLATE_RESULT (olddecl)))
2361 nt = DECL_TEMPLATE_RESULT (newdecl);
2362 if (DECL_TEMPLATE_INFO (nt))
2363 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2364 ot = DECL_TEMPLATE_RESULT (olddecl);
2365 if (DECL_TEMPLATE_INFO (ot))
2366 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2367 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2368 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2369 return G_("redefinition of %q#D");
2371 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2373 bool olda = GNU_INLINE_P (ot);
2374 bool newa = GNU_INLINE_P (nt);
2379 return G_("%q+D redeclared inline with "
2380 "%<gnu_inline%> attribute");
2382 return G_("%q+D redeclared inline without "
2383 "%<gnu_inline%> attribute");
2387 /* Core issue #226 (C++0x):
2389 If a friend function template declaration specifies a
2390 default template-argument, that declaration shall be a
2391 definition and shall be the only declaration of the
2392 function template in the translation unit. */
2393 if ((cxx_dialect != cxx98)
2394 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2395 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2396 /*is_primary=*/1, /*is_partial=*/0,
2397 /*is_friend_decl=*/2))
2398 return G_("redeclaration of friend %q#D "
2399 "may not have default template arguments");
2403 else if (TREE_CODE (newdecl) == VAR_DECL
2404 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2405 && (! DECL_LANG_SPECIFIC (olddecl)
2406 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2407 || DECL_THREAD_LOCAL_P (newdecl)))
2409 /* Only variables can be thread-local, and all declarations must
2410 agree on this property. */
2411 if (DECL_THREAD_LOCAL_P (newdecl))
2412 return G_("thread-local declaration of %q#D follows "
2413 "non-thread-local declaration");
2415 return G_("non-thread-local declaration of %q#D follows "
2416 "thread-local declaration");
2418 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2420 /* The objects have been declared at namespace scope. If either
2421 is a member of an anonymous union, then this is an invalid
2422 redeclaration. For example:
2428 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2429 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2430 return G_("redeclaration of %q#D");
2431 /* If at least one declaration is a reference, there is no
2432 conflict. For example:
2438 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2440 /* Reject two definitions. */
2441 return G_("redefinition of %q#D");
2445 /* Objects declared with block scope: */
2446 /* Reject two definitions, and reject a definition
2447 together with an external reference. */
2448 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2449 return G_("redeclaration of %q#D");
2454 /* Hash and equality functions for the named_label table. */
2457 named_label_entry_hash (const void *data)
2459 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2460 return DECL_UID (ent->label_decl);
2464 named_label_entry_eq (const void *a, const void *b)
2466 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2467 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2468 return ent_a->label_decl == ent_b->label_decl;
2471 /* Create a new label, named ID. */
2474 make_label_decl (tree id, int local_p)
2476 struct named_label_entry *ent;
2480 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2482 DECL_CONTEXT (decl) = current_function_decl;
2483 DECL_MODE (decl) = VOIDmode;
2484 C_DECLARED_LABEL_FLAG (decl) = local_p;
2486 /* Say where one reference is to the label, for the sake of the
2487 error if it is not defined. */
2488 DECL_SOURCE_LOCATION (decl) = input_location;
2490 /* Record the fact that this identifier is bound to this label. */
2491 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2493 /* Create the label htab for the function on demand. */
2495 named_labels = htab_create_ggc (13, named_label_entry_hash,
2496 named_label_entry_eq, NULL);
2498 /* Record this label on the list of labels used in this function.
2499 We do this before calling make_label_decl so that we get the
2500 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2501 ent = ggc_alloc_cleared_named_label_entry ();
2502 ent->label_decl = decl;
2504 slot = htab_find_slot (named_labels, ent, INSERT);
2505 gcc_assert (*slot == NULL);
2511 /* Look for a label named ID in the current function. If one cannot
2512 be found, create one. (We keep track of used, but undefined,
2513 labels, and complain about them at the end of a function.) */
2516 lookup_label (tree id)
2520 timevar_push (TV_NAME_LOOKUP);
2521 /* You can't use labels at global scope. */
2522 if (current_function_decl == NULL_TREE)
2524 error ("label %qE referenced outside of any function", id);
2525 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2528 /* See if we've already got this label. */
2529 decl = IDENTIFIER_LABEL_VALUE (id);
2530 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2531 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2533 decl = make_label_decl (id, /*local_p=*/0);
2534 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2537 /* Declare a local label named ID. */
2540 declare_local_label (tree id)
2543 cp_label_binding *bind;
2545 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2546 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2547 bind = VEC_safe_push (cp_label_binding, gc,
2548 current_binding_level->shadowed_labels, NULL);
2549 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2551 decl = make_label_decl (id, /*local_p=*/1);
2557 /* Returns nonzero if it is ill-formed to jump past the declaration of
2558 DECL. Returns 2 if it's also a real problem. */
2561 decl_jump_unsafe (tree decl)
2563 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2564 with automatic storage duration is not in scope to a point where it is
2565 in scope is ill-formed unless the variable has scalar type, class type
2566 with a trivial default constructor and a trivial destructor, a
2567 cv-qualified version of one of these types, or an array of one of the
2568 preceding types and is declared without an initializer (8.5). */
2569 tree type = TREE_TYPE (decl);
2571 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2572 || type == error_mark_node)
2575 type = strip_array_types (type);
2577 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2578 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2581 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2587 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2590 identify_goto (tree decl, const location_t *locus)
2593 permerror (input_location, "jump to label %qD", decl);
2595 permerror (input_location, "jump to case label");
2597 permerror (*locus, " from here");
2600 /* Check that a single previously seen jump to a newly defined label
2601 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2602 the jump context; NAMES are the names in scope in LEVEL at the jump
2603 context; LOCUS is the source position of the jump or 0. Returns
2604 true if all is well. */
2607 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2608 bool exited_omp, const location_t *locus)
2610 struct cp_binding_level *b;
2611 bool identified = false, saw_eh = false, saw_omp = false;
2615 identify_goto (decl, locus);
2616 error (" exits OpenMP structured block");
2617 identified = saw_omp = true;
2620 for (b = current_binding_level; b ; b = b->level_chain)
2622 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2624 for (new_decls = b->names; new_decls != old_decls;
2625 new_decls = DECL_CHAIN (new_decls))
2627 int problem = decl_jump_unsafe (new_decls);
2633 identify_goto (decl, locus);
2637 error (" crosses initialization of %q+#D", new_decls);
2639 permerror (input_location, " enters scope of %q+#D which has "
2640 "non-trivial destructor", new_decls);
2645 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2649 identify_goto (decl, locus);
2652 if (b->kind == sk_try)
2653 error (" enters try block");
2655 error (" enters catch block");
2658 if (b->kind == sk_omp && !saw_omp)
2662 identify_goto (decl, locus);
2665 error (" enters OpenMP structured block");
2674 check_previous_goto (tree decl, struct named_label_use_entry *use)
2676 check_previous_goto_1 (decl, use->binding_level,
2677 use->names_in_scope, use->in_omp_scope,
2678 &use->o_goto_locus);
2682 check_switch_goto (struct cp_binding_level* level)
2684 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2687 /* Check that a new jump to a label DECL is OK. Called by
2688 finish_goto_stmt. */
2691 check_goto (tree decl)
2693 struct named_label_entry *ent, dummy;
2694 bool saw_catch = false, identified = false;
2698 /* We can't know where a computed goto is jumping.
2699 So we assume that it's OK. */
2700 if (TREE_CODE (decl) != LABEL_DECL)
2703 /* We didn't record any information about this label when we created it,
2704 and there's not much point since it's trivial to analyze as a return. */
2705 if (decl == cdtor_label)
2708 dummy.label_decl = decl;
2709 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2710 gcc_assert (ent != NULL);
2712 /* If the label hasn't been defined yet, defer checking. */
2713 if (! DECL_INITIAL (decl))
2715 struct named_label_use_entry *new_use;
2717 /* Don't bother creating another use if the last goto had the
2718 same data, and will therefore create the same set of errors. */
2720 && ent->uses->names_in_scope == current_binding_level->names)
2723 new_use = ggc_alloc_named_label_use_entry ();
2724 new_use->binding_level = current_binding_level;
2725 new_use->names_in_scope = current_binding_level->names;
2726 new_use->o_goto_locus = input_location;
2727 new_use->in_omp_scope = false;
2729 new_use->next = ent->uses;
2730 ent->uses = new_use;
2734 if (ent->in_try_scope || ent->in_catch_scope
2735 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2737 permerror (input_location, "jump to label %q+D", decl);
2738 permerror (input_location, " from here");
2742 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2744 int u = decl_jump_unsafe (bad);
2746 if (u > 1 && DECL_ARTIFICIAL (bad))
2748 /* Can't skip init of __exception_info. */
2749 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2753 error (" skips initialization of %q+#D", bad);
2755 permerror (input_location, " enters scope of %q+#D which has "
2756 "non-trivial destructor", bad);
2759 if (ent->in_try_scope)
2760 error (" enters try block");
2761 else if (ent->in_catch_scope && !saw_catch)
2762 error (" enters catch block");
2764 if (ent->in_omp_scope)
2765 error (" enters OpenMP structured block");
2766 else if (flag_openmp)
2768 struct cp_binding_level *b;
2769 for (b = current_binding_level; b ; b = b->level_chain)
2771 if (b == ent->binding_level)
2773 if (b->kind == sk_omp)
2777 permerror (input_location, "jump to label %q+D", decl);
2778 permerror (input_location, " from here");
2781 error (" exits OpenMP structured block");
2788 /* Check that a return is ok wrt OpenMP structured blocks.
2789 Called by finish_return_stmt. Returns true if all is well. */
2792 check_omp_return (void)
2794 struct cp_binding_level *b;
2795 for (b = current_binding_level; b ; b = b->level_chain)
2796 if (b->kind == sk_omp)
2798 error ("invalid exit from OpenMP structured block");
2804 /* Define a label, specifying the location in the source file.
2805 Return the LABEL_DECL node for the label. */
2808 define_label (location_t location, tree name)
2810 struct named_label_entry *ent, dummy;
2811 struct cp_binding_level *p;
2814 timevar_push (TV_NAME_LOOKUP);
2816 decl = lookup_label (name);
2818 dummy.label_decl = decl;
2819 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2820 gcc_assert (ent != NULL);
2822 /* After labels, make any new cleanups in the function go into their
2823 own new (temporary) binding contour. */
2824 for (p = current_binding_level;
2825 p->kind != sk_function_parms;
2827 p->more_cleanups_ok = 0;
2829 if (name == get_identifier ("wchar_t"))
2830 permerror (input_location, "label named wchar_t");
2832 if (DECL_INITIAL (decl) != NULL_TREE)
2834 error ("duplicate label %qD", decl);
2835 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2839 struct named_label_use_entry *use;
2841 /* Mark label as having been defined. */
2842 DECL_INITIAL (decl) = error_mark_node;
2843 /* Say where in the source. */
2844 DECL_SOURCE_LOCATION (decl) = location;
2846 ent->binding_level = current_binding_level;
2847 ent->names_in_scope = current_binding_level->names;
2849 for (use = ent->uses; use ; use = use->next)
2850 check_previous_goto (decl, use);
2854 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2859 struct cp_binding_level *level;
2860 struct cp_switch *next;
2861 /* The SWITCH_STMT being built. */
2863 /* A splay-tree mapping the low element of a case range to the high
2864 element, or NULL_TREE if there is no high element. Used to
2865 determine whether or not a new case label duplicates an old case
2866 label. We need a tree, rather than simply a hash table, because
2867 of the GNU case range extension. */
2871 /* A stack of the currently active switch statements. The innermost
2872 switch statement is on the top of the stack. There is no need to
2873 mark the stack for garbage collection because it is only active
2874 during the processing of the body of a function, and we never
2875 collect at that point. */
2877 static struct cp_switch *switch_stack;
2879 /* Called right after a switch-statement condition is parsed.
2880 SWITCH_STMT is the switch statement being parsed. */
2883 push_switch (tree switch_stmt)
2885 struct cp_switch *p = XNEW (struct cp_switch);
2886 p->level = current_binding_level;
2887 p->next = switch_stack;
2888 p->switch_stmt = switch_stmt;
2889 p->cases = splay_tree_new (case_compare, NULL, NULL);
2896 struct cp_switch *cs = switch_stack;
2897 location_t switch_location;
2899 /* Emit warnings as needed. */
2900 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2901 if (!processing_template_decl)
2902 c_do_switch_warnings (cs->cases, switch_location,
2903 SWITCH_STMT_TYPE (cs->switch_stmt),
2904 SWITCH_STMT_COND (cs->switch_stmt));
2906 splay_tree_delete (cs->cases);
2907 switch_stack = switch_stack->next;
2911 /* Note that we've seen a definition of a case label, and complain if this
2912 is a bad place for one. */
2915 finish_case_label (location_t loc, tree low_value, tree high_value)
2918 struct cp_binding_level *p;
2920 if (processing_template_decl)
2924 /* For templates, just add the case label; we'll do semantic
2925 analysis at instantiation-time. */
2926 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2927 return add_stmt (build_case_label (loc, low_value, high_value, label));
2930 /* Find the condition on which this switch statement depends. */
2931 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2932 if (cond && TREE_CODE (cond) == TREE_LIST)
2933 cond = TREE_VALUE (cond);
2935 if (!check_switch_goto (switch_stack->level))
2936 return error_mark_node;
2939 low_value = cxx_constant_value (low_value);
2941 high_value = cxx_constant_value (high_value);
2943 r = c_add_case_label (loc, switch_stack->cases, cond,
2944 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2945 low_value, high_value);
2947 /* After labels, make any new cleanups in the function go into their
2948 own new (temporary) binding contour. */
2949 for (p = current_binding_level;
2950 p->kind != sk_function_parms;
2952 p->more_cleanups_ok = 0;
2957 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2960 typename_hash (const void* k)
2963 const_tree const t = (const_tree) k;
2965 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2966 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2971 typedef struct typename_info {
2979 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2980 really of type `typename_info*' */
2983 typename_compare (const void * k1, const void * k2)
2985 const_tree const t1 = (const_tree) k1;
2986 const typename_info *const t2 = (const typename_info *) k2;
2988 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2989 && TYPE_CONTEXT (t1) == t2->scope
2990 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2991 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2992 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2995 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2996 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2998 Returns the new TYPENAME_TYPE. */
3000 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3003 build_typename_type (tree context, tree name, tree fullname,
3004 enum tag_types tag_type)
3012 if (typename_htab == NULL)
3013 typename_htab = htab_create_ggc (61, &typename_hash,
3014 &typename_compare, NULL);
3016 ti.scope = FROB_CONTEXT (context);
3018 ti.template_id = fullname;
3019 ti.enum_p = tag_type == enum_type;
3020 ti.class_p = (tag_type == class_type
3021 || tag_type == record_type
3022 || tag_type == union_type);
3023 hash = (htab_hash_pointer (ti.scope)
3024 ^ htab_hash_pointer (ti.name));
3026 /* See if we already have this type. */
3027 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3032 /* Build the TYPENAME_TYPE. */
3033 t = cxx_make_type (TYPENAME_TYPE);
3034 TYPE_CONTEXT (t) = ti.scope;
3035 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3036 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3037 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3039 /* Build the corresponding TYPE_DECL. */
3040 d = build_decl (input_location, TYPE_DECL, name, t);
3041 TYPE_NAME (TREE_TYPE (d)) = d;
3042 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3043 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3044 DECL_ARTIFICIAL (d) = 1;
3046 /* Store it in the hash table. */
3049 /* TYPENAME_TYPEs must always be compared structurally, because
3050 they may or may not resolve down to another type depending on
3051 the currently open classes. */
3052 SET_TYPE_STRUCTURAL_EQUALITY (t);
3058 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3059 provided to name the type. Returns an appropriate type, unless an
3060 error occurs, in which case error_mark_node is returned. If we
3061 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3062 return that, rather than the _TYPE it corresponds to, in other
3063 cases we look through the type decl. If TF_ERROR is set, complain
3064 about errors, otherwise be quiet. */
3067 make_typename_type (tree context, tree name, enum tag_types tag_type,
3068 tsubst_flags_t complain)
3074 if (name == error_mark_node
3075 || context == NULL_TREE
3076 || context == error_mark_node)
3077 return error_mark_node;
3081 if (!(TYPE_LANG_SPECIFIC (name)
3082 && (CLASSTYPE_IS_TEMPLATE (name)
3083 || CLASSTYPE_USE_TEMPLATE (name))))
3084 name = TYPE_IDENTIFIER (name);
3086 /* Create a TEMPLATE_ID_EXPR for the type. */
3087 name = build_nt (TEMPLATE_ID_EXPR,
3088 CLASSTYPE_TI_TEMPLATE (name),
3089 CLASSTYPE_TI_ARGS (name));
3091 else if (TREE_CODE (name) == TYPE_DECL)
3092 name = DECL_NAME (name);
3096 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3098 name = TREE_OPERAND (name, 0);
3099 if (TREE_CODE (name) == TEMPLATE_DECL)
3100 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3101 else if (TREE_CODE (name) == OVERLOAD)
3103 error ("%qD is not a type", name);
3104 return error_mark_node;
3107 if (TREE_CODE (name) == TEMPLATE_DECL)
3109 error ("%qD used without template parameters", name);
3110 return error_mark_node;
3112 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3113 gcc_assert (TYPE_P (context));
3115 if (!MAYBE_CLASS_TYPE_P (context))
3117 if (complain & tf_error)
3118 error ("%q#T is not a class", context);
3119 return error_mark_node;
3122 /* When the CONTEXT is a dependent type, NAME could refer to a
3123 dependent base class of CONTEXT. But look inside it anyway
3124 if CONTEXT is a currently open scope, in case it refers to a
3125 member of the current instantiation or a non-dependent base;
3126 lookup will stop when we hit a dependent base. */
3127 if (!dependent_scope_p (context))
3128 /* We should only set WANT_TYPE when we're a nested typename type.
3129 Then we can give better diagnostics if we find a non-type. */
3130 t = lookup_field (context, name, 2, /*want_type=*/true);
3134 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3135 return build_typename_type (context, name, fullname, tag_type);
3137 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3141 if (complain & tf_error)
3142 error (want_template ? "no class template named %q#T in %q#T"
3143 : "no type named %q#T in %q#T", name, context);
3144 return error_mark_node;
3147 /* Pull out the template from an injected-class-name (or multiple). */
3149 t = maybe_get_template_decl_from_type_decl (t);
3151 if (TREE_CODE (t) == TREE_LIST)
3153 if (complain & tf_error)
3155 error ("lookup of %qT in %qT is ambiguous", name, context);
3156 print_candidates (t);
3158 return error_mark_node;
3161 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3163 if (complain & tf_error)
3164 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3166 return error_mark_node;
3168 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3170 if (complain & tf_error)
3171 error ("%<typename %T::%D%> names %q#T, which is not a type",
3173 return error_mark_node;
3176 if (complain & tf_error)
3177 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3179 /* If we are currently parsing a template and if T is a typedef accessed
3180 through CONTEXT then we need to remember and check access of T at
3181 template instantiation time. */
3182 add_typedef_to_current_template_for_access_check (t, context, input_location);
3185 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3187 /*entering_scope=*/0,
3188 tf_warning_or_error | tf_user);
3190 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3196 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3197 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3198 in which case error_mark_node is returned.
3200 If PARM_LIST is non-NULL, also make sure that the template parameter
3201 list of TEMPLATE_DECL matches.
3203 If COMPLAIN zero, don't complain about any errors that occur. */
3206 make_unbound_class_template (tree context, tree name, tree parm_list,
3207 tsubst_flags_t complain)
3213 name = TYPE_IDENTIFIER (name);
3214 else if (DECL_P (name))
3215 name = DECL_NAME (name);
3216 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3218 if (!dependent_type_p (context)
3219 || currently_open_class (context))
3221 tree tmpl = NULL_TREE;
3223 if (MAYBE_CLASS_TYPE_P (context))
3224 tmpl = lookup_field (context, name, 0, false);
3226 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3228 if (complain & tf_error)
3229 error ("no class template named %q#T in %q#T", name, context);
3230 return error_mark_node;
3234 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3236 if (complain & tf_error)
3238 error ("template parameters do not match template");
3239 error ("%q+D declared here", tmpl);
3241 return error_mark_node;
3244 if (complain & tf_error)
3245 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3250 /* Build the UNBOUND_CLASS_TEMPLATE. */
3251 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3252 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3253 TREE_TYPE (t) = NULL_TREE;
3254 SET_TYPE_STRUCTURAL_EQUALITY (t);
3256 /* Build the corresponding TEMPLATE_DECL. */
3257 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3258 TYPE_NAME (TREE_TYPE (d)) = d;
3259 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3260 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3261 DECL_ARTIFICIAL (d) = 1;
3262 DECL_TEMPLATE_PARMS (d) = parm_list;
3269 /* Push the declarations of builtin types into the namespace.
3270 RID_INDEX is the index of the builtin type in the array
3271 RID_POINTERS. NAME is the name used when looking up the builtin
3272 type. TYPE is the _TYPE node for the builtin type. */
3275 record_builtin_type (enum rid rid_index,
3279 tree rname = NULL_TREE, tname = NULL_TREE;
3280 tree tdecl = NULL_TREE;
3282 if ((int) rid_index < (int) RID_MAX)
3283 rname = ridpointers[(int) rid_index];
3285 tname = get_identifier (name);
3287 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3288 eliminated. Built-in types should not be looked up name; their
3289 names are keywords that the parser can recognize. However, there
3290 is code in c-common.c that uses identifier_global_value to look
3291 up built-in types by name. */
3294 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3295 DECL_ARTIFICIAL (tdecl) = 1;
3296 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3302 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3303 DECL_ARTIFICIAL (tdecl) = 1;
3305 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3308 if (!TYPE_NAME (type))
3309 TYPE_NAME (type) = tdecl;
3312 debug_hooks->type_decl (tdecl, 0);
3315 /* Record one of the standard Java types.
3316 * Declare it as having the given NAME.
3317 * If SIZE > 0, it is the size of one of the integral types;
3318 * otherwise it is the negative of the size of one of the other types. */
3321 record_builtin_java_type (const char* name, int size)
3325 type = build_nonstandard_integer_type (size, 0);
3326 else if (size > -32)
3329 /* "__java_char" or ""__java_boolean". */
3330 type = build_nonstandard_integer_type (-size, 1);
3331 /* Get the signed type cached and attached to the unsigned type,
3332 so it doesn't get garbage-collected at "random" times,
3333 causing potential codegen differences out of different UIDs
3334 and different alias set numbers. */
3335 stype = build_nonstandard_integer_type (-size, 0);
3336 TREE_CHAIN (type) = stype;
3337 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3340 { /* "__java_float" or ""__java_double". */
3341 type = make_node (REAL_TYPE);
3342 TYPE_PRECISION (type) = - size;
3345 record_builtin_type (RID_MAX, name, type);
3346 decl = TYPE_NAME (type);
3348 /* Suppress generate debug symbol entries for these types,
3349 since for normal C++ they are just clutter.
3350 However, push_lang_context undoes this if extern "Java" is seen. */
3351 DECL_IGNORED_P (decl) = 1;
3353 TYPE_FOR_JAVA (type) = 1;
3357 /* Push a type into the namespace so that the back ends ignore it. */
3360 record_unknown_type (tree type, const char* name)
3362 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3363 TYPE_DECL, get_identifier (name), type));
3364 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3365 DECL_IGNORED_P (decl) = 1;
3366 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3367 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3368 TYPE_ALIGN (type) = 1;
3369 TYPE_USER_ALIGN (type) = 0;
3370 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3373 /* A string for which we should create an IDENTIFIER_NODE at
3376 typedef struct predefined_identifier
3378 /* The name of the identifier. */
3379 const char *const name;
3380 /* The place where the IDENTIFIER_NODE should be stored. */
3382 /* Nonzero if this is the name of a constructor or destructor. */
3383 const int ctor_or_dtor_p;
3384 } predefined_identifier;
3386 /* Create all the predefined identifiers. */
3389 initialize_predefined_identifiers (void)
3391 const predefined_identifier *pid;
3393 /* A table of identifiers to create at startup. */
3394 static const predefined_identifier predefined_identifiers[] = {
3395 { "C++", &lang_name_cplusplus, 0 },
3396 { "C", &lang_name_c, 0 },
3397 { "Java", &lang_name_java, 0 },
3398 /* Some of these names have a trailing space so that it is
3399 impossible for them to conflict with names written by users. */
3400 { "__ct ", &ctor_identifier, 1 },
3401 { "__base_ctor ", &base_ctor_identifier, 1 },
3402 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3403 { "__dt ", &dtor_identifier, 1 },
3404 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3405 { "__base_dtor ", &base_dtor_identifier, 1 },
3406 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3407 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3408 { "nelts", &nelts_identifier, 0 },
3409 { THIS_NAME, &this_identifier, 0 },
3410 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3411 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3412 { "_vptr", &vptr_identifier, 0 },
3413 { "__vtt_parm", &vtt_parm_identifier, 0 },
3414 { "::", &global_scope_name, 0 },
3415 { "std", &std_identifier, 0 },
3419 for (pid = predefined_identifiers; pid->name; ++pid)
3421 *pid->node = get_identifier (pid->name);
3422 if (pid->ctor_or_dtor_p)
3423 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3427 /* Create the predefined scalar types of C,
3428 and some nodes representing standard constants (0, 1, (void *)0).
3429 Initialize the global binding level.
3430 Make definitions for built-in primitive functions. */
3433 cxx_init_decl_processing (void)
3436 tree void_ftype_ptr;
3438 build_common_tree_nodes (flag_signed_char);
3440 /* Create all the identifiers we need. */
3441 initialize_predefined_identifiers ();
3443 /* Create the global variables. */
3444 push_to_top_level ();
3446 current_function_decl = NULL_TREE;
3447 current_binding_level = NULL;
3448 /* Enter the global namespace. */
3449 gcc_assert (global_namespace == NULL_TREE);
3450 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3452 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3453 TREE_PUBLIC (global_namespace) = 1;
3454 begin_scope (sk_namespace, global_namespace);
3456 current_lang_name = NULL_TREE;
3458 if (flag_visibility_ms_compat)
3459 default_visibility = VISIBILITY_HIDDEN;
3462 current_lang_name = lang_name_c;
3464 /* Create the `std' namespace. */
3465 push_namespace (std_identifier);
3466 std_node = current_namespace;
3469 c_common_nodes_and_builtins ();
3471 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3472 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3473 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3474 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3475 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3476 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3477 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3478 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3480 integer_two_node = build_int_cst (NULL_TREE, 2);
3482 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3483 truthvalue_type_node = boolean_type_node;
3484 truthvalue_false_node = boolean_false_node;
3485 truthvalue_true_node = boolean_true_node;
3487 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3488 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3489 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3492 record_builtin_type (RID_MAX, NULL, string_type_node);
3495 delta_type_node = ptrdiff_type_node;
3496 vtable_index_type = ptrdiff_type_node;
3498 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3499 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3500 void_ftype_ptr = build_function_type_list (void_type_node,
3501 ptr_type_node, NULL_TREE);
3503 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3505 /* C++ extensions */
3507 unknown_type_node = make_node (LANG_TYPE);
3508 record_unknown_type (unknown_type_node, "unknown type");
3510 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3511 TREE_TYPE (unknown_type_node) = unknown_type_node;
3513 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3515 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3516 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3518 init_list_type_node = make_node (LANG_TYPE);
3519 record_unknown_type (init_list_type_node, "init list");
3522 /* Make sure we get a unique function type, so we can give
3523 its pointer type a name. (This wins for gdb.) */
3524 tree vfunc_type = make_node (FUNCTION_TYPE);
3525 TREE_TYPE (vfunc_type) = integer_type_node;
3526 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3527 layout_type (vfunc_type);
3529 vtable_entry_type = build_pointer_type (vfunc_type);
3531 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3534 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3535 layout_type (vtbl_type_node);
3536 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3537 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3538 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3539 layout_type (vtbl_ptr_type_node);
3540 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3542 push_namespace (get_identifier ("__cxxabiv1"));
3543 abi_node = current_namespace;
3546 global_type_node = make_node (LANG_TYPE);
3547 record_unknown_type (global_type_node, "global type");
3550 current_lang_name = lang_name_cplusplus;
3553 tree newtype, deltype;
3554 tree ptr_ftype_sizetype;
3558 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3559 if (cxx_dialect == cxx98)
3562 tree bad_alloc_type_node;
3563 tree bad_alloc_decl;
3565 push_namespace (std_identifier);
3566 bad_alloc_id = get_identifier ("bad_alloc");
3567 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3568 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3570 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3571 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3575 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3578 new_eh_spec = noexcept_false_spec;
3580 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3581 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3582 push_cp_library_fn (NEW_EXPR, newtype);
3583 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3584 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3585 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3587 nullptr_type_node = make_node (NULLPTR_TYPE);
3588 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3589 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3590 TYPE_UNSIGNED (nullptr_type_node) = 1;
3591 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3592 SET_TYPE_MODE (nullptr_type_node, Pmode);
3593 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3594 nullptr_node = build_int_cst (nullptr_type_node, 0);
3598 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3600 /* Perform other language dependent initializations. */
3601 init_class_processing ();
3602 init_rtti_processing ();
3603 init_template_processing ();
3605 if (flag_exceptions)
3606 init_exception_processing ();
3608 if (! supports_one_only ())
3611 make_fname_decl = cp_make_fname_decl;
3612 start_fname_decls ();
3614 /* Show we use EH for cleanups. */
3615 if (flag_exceptions)
3616 using_eh_for_cleanups ();
3619 /* Generate an initializer for a function naming variable from
3620 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3621 filled in with the type of the init. */
3624 cp_fname_init (const char* name, tree *type_p)
3626 tree domain = NULL_TREE;
3628 tree init = NULL_TREE;
3633 length = strlen (name);
3634 domain = build_index_type (size_int (length));
3635 init = build_string (length + 1, name);
3638 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3639 type = build_cplus_array_type (type, domain);
3644 TREE_TYPE (init) = type;
3646 init = error_mark_node;
3651 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3652 the decl, LOC is the location to give the decl, NAME is the
3653 initialization string and TYPE_DEP indicates whether NAME depended
3654 on the type of the function. We make use of that to detect
3655 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3656 at the point of first use, so we mustn't push the decl now. */
3659 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3661 const char *const name = (type_dep && processing_template_decl
3662 ? NULL : fname_as_string (type_dep));
3664 tree init = cp_fname_init (name, &type);
3665 tree decl = build_decl (loc, VAR_DECL, id, type);
3668 free (CONST_CAST (char *, name));
3670 /* As we're using pushdecl_with_scope, we must set the context. */
3671 DECL_CONTEXT (decl) = current_function_decl;
3672 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3674 TREE_STATIC (decl) = 1;
3675 TREE_READONLY (decl) = 1;
3676 DECL_ARTIFICIAL (decl) = 1;
3678 TREE_USED (decl) = 1;
3680 if (current_function_decl)
3682 struct cp_binding_level *b = current_binding_level;
3683 while (b->level_chain->kind != sk_function_parms)
3685 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3686 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3687 LOOKUP_ONLYCONVERTING);
3690 pushdecl_top_level_and_finish (decl, init);
3696 builtin_function_1 (tree decl, tree context, bool is_global)
3698 tree id = DECL_NAME (decl);
3699 const char *name = IDENTIFIER_POINTER (id);
3701 retrofit_lang_decl (decl);
3703 DECL_ARTIFICIAL (decl) = 1;
3704 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3705 SET_DECL_LANGUAGE (decl, lang_c);
3706 /* Runtime library routines are, by definition, available in an
3707 external shared object. */
3708 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3709 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3711 DECL_CONTEXT (decl) = context;
3714 pushdecl_top_level (decl);
3718 /* A function in the user's namespace should have an explicit
3719 declaration before it is used. Mark the built-in function as
3720 anticipated but not actually declared. */
3721 if (name[0] != '_' || name[1] != '_')
3722 DECL_ANTICIPATED (decl) = 1;
3723 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3725 size_t len = strlen (name);
3727 /* Treat __*_chk fortification functions as anticipated as well,
3728 unless they are __builtin_*. */
3729 if (len > strlen ("___chk")
3730 && memcmp (name + len - strlen ("_chk"),
3731 "_chk", strlen ("_chk") + 1) == 0)
3732 DECL_ANTICIPATED (decl) = 1;
3739 cxx_builtin_function (tree decl)
3741 tree id = DECL_NAME (decl);
3742 const char *name = IDENTIFIER_POINTER (id);
3743 /* All builtins that don't begin with an '_' should additionally
3744 go in the 'std' namespace. */
3747 tree decl2 = copy_node(decl);
3748 push_namespace (std_identifier);
3749 builtin_function_1 (decl2, std_node, false);
3753 return builtin_function_1 (decl, NULL_TREE, false);
3756 /* Like cxx_builtin_function, but guarantee the function is added to the global
3757 scope. This is to allow function specific options to add new machine
3758 dependent builtins when the target ISA changes via attribute((target(...)))
3759 which saves space on program startup if the program does not use non-generic
3763 cxx_builtin_function_ext_scope (tree decl)
3766 tree id = DECL_NAME (decl);
3767 const char *name = IDENTIFIER_POINTER (id);
3768 /* All builtins that don't begin with an '_' should additionally
3769 go in the 'std' namespace. */
3772 tree decl2 = copy_node(decl);
3773 push_namespace (std_identifier);
3774 builtin_function_1 (decl2, std_node, true);
3778 return builtin_function_1 (decl, NULL_TREE, true);
3781 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3782 function. Not called directly. */
3785 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3787 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3788 DECL_EXTERNAL (fn) = 1;
3789 TREE_PUBLIC (fn) = 1;
3790 DECL_ARTIFICIAL (fn) = 1;
3791 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3792 SET_DECL_LANGUAGE (fn, lang_c);
3793 /* Runtime library routines are, by definition, available in an
3794 external shared object. */
3795 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3796 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3800 /* Returns the _DECL for a library function with C linkage.
3801 We assume that such functions never throw; if this is incorrect,
3802 callers should unset TREE_NOTHROW. */
3805 build_library_fn (tree name, tree type)
3807 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3808 TREE_NOTHROW (fn) = 1;
3812 /* Returns the _DECL for a library function with C++ linkage. */
3815 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3817 tree fn = build_library_fn_1 (name, operator_code, type);
3818 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3819 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3820 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3824 /* Like build_library_fn, but takes a C string instead of an
3828 build_library_fn_ptr (const char* name, tree type)
3830 return build_library_fn (get_identifier (name), type);
3833 /* Like build_cp_library_fn, but takes a C string instead of an
3837 build_cp_library_fn_ptr (const char* name, tree type)
3839 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3842 /* Like build_library_fn, but also pushes the function so that we will
3843 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3844 may throw exceptions listed in RAISES. */
3847 push_library_fn (tree name, tree type, tree raises)
3852 type = build_exception_variant (type, raises);
3854 fn = build_library_fn (name, type);
3855 pushdecl_top_level (fn);
3859 /* Like build_cp_library_fn, but also pushes the function so that it
3860 will be found by normal lookup. */
3863 push_cp_library_fn (enum tree_code operator_code, tree type)
3865 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3872 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3876 push_void_library_fn (tree name, tree parmtypes)
3878 tree type = build_function_type (void_type_node, parmtypes);
3879 return push_library_fn (name, type, NULL_TREE);
3882 /* Like push_library_fn, but also note that this function throws
3883 and does not return. Used for __throw_foo and the like. */
3886 push_throw_library_fn (tree name, tree type)
3888 tree fn = push_library_fn (name, type, NULL_TREE);
3889 TREE_THIS_VOLATILE (fn) = 1;
3890 TREE_NOTHROW (fn) = 0;
3894 /* When we call finish_struct for an anonymous union, we create
3895 default copy constructors and such. But, an anonymous union
3896 shouldn't have such things; this function undoes the damage to the
3897 anonymous union type T.
3899 (The reason that we create the synthesized methods is that we don't
3900 distinguish `union { int i; }' from `typedef union { int i; } U'.
3901 The first is an anonymous union; the second is just an ordinary
3905 fixup_anonymous_aggr (tree t)
3909 /* Wipe out memory of synthesized methods. */
3910 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3911 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3912 TYPE_HAS_COPY_CTOR (t) = 0;
3913 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3914 TYPE_HAS_COPY_ASSIGN (t) = 0;
3915 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3917 /* Splice the implicitly generated functions out of the TYPE_METHODS
3919 q = &TYPE_METHODS (t);
3922 if (DECL_ARTIFICIAL (*q))
3923 *q = TREE_CHAIN (*q);
3925 q = &DECL_CHAIN (*q);
3928 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3929 if (TYPE_METHODS (t))
3931 tree decl = TYPE_MAIN_DECL (t);
3933 if (TREE_CODE (t) != UNION_TYPE)
3934 error_at (DECL_SOURCE_LOCATION (decl),
3935 "an anonymous struct cannot have function members");
3937 error_at (DECL_SOURCE_LOCATION (decl),
3938 "an anonymous union cannot have function members");
3941 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3942 assignment operators (because they cannot have these methods themselves).
3943 For anonymous unions this is already checked because they are not allowed
3944 in any union, otherwise we have to check it. */
3945 if (TREE_CODE (t) != UNION_TYPE)
3949 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3950 if (TREE_CODE (field) == FIELD_DECL)
3952 type = TREE_TYPE (field);
3953 if (CLASS_TYPE_P (type))
3955 if (TYPE_NEEDS_CONSTRUCTING (type))
3956 error ("member %q+#D with constructor not allowed "
3957 "in anonymous aggregate", field);
3958 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3959 error ("member %q+#D with destructor not allowed "
3960 "in anonymous aggregate", field);
3961 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3962 error ("member %q+#D with copy assignment operator "
3963 "not allowed in anonymous aggregate", field);
3969 /* Make sure that a declaration with no declarator is well-formed, i.e.
3970 just declares a tagged type or anonymous union.
3972 Returns the type declared; or NULL_TREE if none. */
3975 check_tag_decl (cp_decl_specifier_seq *declspecs)
3977 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3978 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3979 /* If a class, struct, or enum type is declared by the DECLSPECS
3980 (i.e, if a class-specifier, enum-specifier, or non-typename
3981 elaborated-type-specifier appears in the DECLSPECS),
3982 DECLARED_TYPE is set to the corresponding type. */
3983 tree declared_type = NULL_TREE;
3984 bool error_p = false;
3986 if (declspecs->multiple_types_p)
3987 error ("multiple types in one declaration");
3988 else if (declspecs->redefined_builtin_type)
3990 if (!in_system_header)
3991 permerror (input_location, "redeclaration of C++ built-in type %qT",
3992 declspecs->redefined_builtin_type);
3997 && TYPE_P (declspecs->type)
3998 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3999 && MAYBE_CLASS_TYPE_P (declspecs->type))
4000 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4001 declared_type = declspecs->type;
4002 else if (declspecs->type == error_mark_node)
4004 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4005 permerror (input_location, "declaration does not declare anything");
4006 /* Check for an anonymous union. */
4007 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4008 && TYPE_ANONYMOUS_P (declared_type))
4010 /* 7/3 In a simple-declaration, the optional init-declarator-list
4011 can be omitted only when declaring a class (clause 9) or
4012 enumeration (7.2), that is, when the decl-specifier-seq contains
4013 either a class-specifier, an elaborated-type-specifier with
4014 a class-key (9.1), or an enum-specifier. In these cases and
4015 whenever a class-specifier or enum-specifier is present in the
4016 decl-specifier-seq, the identifiers in these specifiers are among
4017 the names being declared by the declaration (as class-name,
4018 enum-names, or enumerators, depending on the syntax). In such
4019 cases, and except for the declaration of an unnamed bit-field (9.6),
4020 the decl-specifier-seq shall introduce one or more names into the
4021 program, or shall redeclare a name introduced by a previous
4022 declaration. [Example:
4023 enum { }; // ill-formed
4024 typedef class { }; // ill-formed
4028 error ("missing type-name in typedef-declaration");
4031 /* Anonymous unions are objects, so they can have specifiers. */;
4032 SET_ANON_AGGR_TYPE_P (declared_type);
4034 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4035 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4040 if (declspecs->specs[(int)ds_inline]
4041 || declspecs->specs[(int)ds_virtual])
4042 error ("%qs can only be specified for functions",
4043 declspecs->specs[(int)ds_inline]
4044 ? "inline" : "virtual");
4046 && (!current_class_type
4047 || current_scope () != current_class_type))
4048 error ("%<friend%> can only be specified inside a class");
4049 else if (declspecs->specs[(int)ds_explicit])
4050 error ("%<explicit%> can only be specified for constructors");
4051 else if (declspecs->storage_class)
4052 error ("a storage class can only be specified for objects "
4054 else if (declspecs->specs[(int)ds_const]
4055 || declspecs->specs[(int)ds_volatile]
4056 || declspecs->specs[(int)ds_restrict]
4057 || declspecs->specs[(int)ds_thread])
4058 error ("qualifiers can only be specified for objects "
4060 else if (saw_typedef)
4061 warning (0, "%<typedef%> was ignored in this declaration");
4062 else if (declspecs->specs[(int) ds_constexpr])
4063 error ("%<constexpr%> cannot be used for type declarations");
4066 return declared_type;
4069 /* Called when a declaration is seen that contains no names to declare.
4070 If its type is a reference to a structure, union or enum inherited
4071 from a containing scope, shadow that tag name for the current scope
4072 with a forward reference.
4073 If its type defines a new named structure or union
4074 or defines an enum, it is valid but we need not do anything here.
4075 Otherwise, it is an error.
4077 C++: may have to grok the declspecs to learn about static,
4078 complain for anonymous unions.
4080 Returns the TYPE declared -- or NULL_TREE if none. */
4083 shadow_tag (cp_decl_specifier_seq *declspecs)
4085 tree t = check_tag_decl (declspecs);
4090 if (declspecs->attributes)
4092 warning (0, "attribute ignored in declaration of %q+#T", t);
4093 warning (0, "attribute for %q+#T must follow the %qs keyword",
4094 t, class_key_or_enum_as_string (t));
4098 if (maybe_process_partial_specialization (t) == error_mark_node)
4101 /* This is where the variables in an anonymous union are
4102 declared. An anonymous union declaration looks like:
4104 because there is no declarator after the union, the parser
4105 sends that declaration here. */
4106 if (ANON_AGGR_TYPE_P (t))
4108 fixup_anonymous_aggr (t);
4110 if (TYPE_FIELDS (t))
4112 tree decl = grokdeclarator (/*declarator=*/NULL,
4113 declspecs, NORMAL, 0, NULL);
4114 finish_anon_union (decl);
4121 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4124 groktypename (cp_decl_specifier_seq *type_specifiers,
4125 const cp_declarator *declarator,
4126 bool is_template_arg)
4130 enum decl_context context
4131 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4132 attrs = type_specifiers->attributes;
4133 type_specifiers->attributes = NULL_TREE;
4134 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4135 if (attrs && type != error_mark_node)
4137 if (CLASS_TYPE_P (type))
4138 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4139 "outside of definition", type);
4140 else if (MAYBE_CLASS_TYPE_P (type))
4141 /* A template type parameter or other dependent type. */
4142 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4143 "type %qT without an associated declaration", type);
4145 cplus_decl_attributes (&type, attrs, 0);
4150 /* Process a DECLARATOR for a function-scope variable declaration,
4151 namespace-scope variable declaration, or function declaration.
4152 (Function definitions go through start_function; class member
4153 declarations appearing in the body of the class go through
4154 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4155 If an error occurs, the error_mark_node is returned instead.
4157 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4158 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4159 for an explicitly defaulted function, or SD_DELETED for an explicitly
4160 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4161 implicitly initialized via a default constructor. ATTRIBUTES and
4162 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4163 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4164 set, the caller is responsible for calling pop_scope. */
4167 start_decl (const cp_declarator *declarator,
4168 cp_decl_specifier_seq *declspecs,
4171 tree prefix_attributes,
4172 tree *pushed_scope_p)
4180 *pushed_scope_p = NULL_TREE;
4182 /* An object declared as __attribute__((deprecated)) suppresses
4183 warnings of uses of other deprecated items. */
4184 if (lookup_attribute ("deprecated", attributes))
4185 deprecated_state = DEPRECATED_SUPPRESS;
4187 attributes = chainon (attributes, prefix_attributes);
4189 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4192 deprecated_state = DEPRECATED_NORMAL;
4194 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4195 || decl == error_mark_node)
4196 return error_mark_node;
4198 context = CP_DECL_CONTEXT (decl);
4199 if (context != global_namespace)
4200 *pushed_scope_p = push_scope (context);
4203 /* Is it valid for this decl to have an initializer at all?
4204 If not, set INITIALIZED to zero, which will indirectly
4205 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4206 switch (TREE_CODE (decl))
4209 error ("typedef %qD is initialized (use decltype instead)", decl);
4210 return error_mark_node;
4213 if (initialized == SD_DELETED)
4214 /* We'll handle the rest of the semantics later, but we need to
4215 set this now so it's visible to duplicate_decls. */
4216 DECL_DELETED_FN (decl) = 1;
4225 if (! toplevel_bindings_p ()
4226 && DECL_EXTERNAL (decl))
4227 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4229 DECL_EXTERNAL (decl) = 0;
4230 if (toplevel_bindings_p ())
4231 TREE_STATIC (decl) = 1;
4233 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4235 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4236 record_key_method_defined (decl);
4238 /* If this is a typedef that names the class for linkage purposes
4239 (7.1.3p8), apply any attributes directly to the type. */
4240 if (TREE_CODE (decl) == TYPE_DECL
4241 && TAGGED_TYPE_P (TREE_TYPE (decl))
4242 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4243 flags = ATTR_FLAG_TYPE_IN_PLACE;
4247 /* Set attributes here so if duplicate decl, will have proper attributes. */
4248 cplus_decl_attributes (&decl, attributes, flags);
4250 /* Dllimported symbols cannot be defined. Static data members (which
4251 can be initialized in-class and dllimported) go through grokfield,
4252 not here, so we don't need to exclude those decls when checking for
4254 if (initialized && DECL_DLLIMPORT_P (decl))
4256 error ("definition of %q#D is marked %<dllimport%>", decl);
4257 DECL_DLLIMPORT_P (decl) = 0;
4260 /* If #pragma weak was used, mark the decl weak now. */
4261 maybe_apply_pragma_weak (decl);
4263 if (TREE_CODE (decl) == FUNCTION_DECL
4264 && DECL_DECLARED_INLINE_P (decl)
4265 && DECL_UNINLINABLE (decl)
4266 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4267 warning (0, "inline function %q+D given attribute noinline", decl);
4269 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4271 if (TREE_CODE (decl) == VAR_DECL)
4273 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4274 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4275 error ("%q#D is not a static member of %q#T", decl, context);
4278 if (DECL_CONTEXT (field) != context)
4280 if (!same_type_p (DECL_CONTEXT (field), context))
4281 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4282 "to be defined as %<%T::%D%>",
4283 DECL_CONTEXT (field), DECL_NAME (decl),
4284 context, DECL_NAME (decl));
4285 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4287 if (processing_specialization
4288 && template_class_depth (context) == 0
4289 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4290 error ("template header not allowed in member definition "
4291 "of explicitly specialized class");
4292 /* Static data member are tricky; an in-class initialization
4293 still doesn't provide a definition, so the in-class
4294 declaration will have DECL_EXTERNAL set, but will have an
4295 initialization. Thus, duplicate_decls won't warn
4296 about this situation, and so we check here. */
4297 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4298 error ("duplicate initialization of %qD", decl);
4299 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4301 if (declspecs->specs[(int) ds_constexpr]
4302 && !DECL_DECLARED_CONSTEXPR_P (field))
4303 error ("%qD declared %<constexpr%> outside its class", field);
4308 tree field = check_classfn (context, decl,
4309 (processing_template_decl
4310 > template_class_depth (context))
4311 ? current_template_parms
4313 if (field && field != error_mark_node
4314 && duplicate_decls (decl, field,
4315 /*newdecl_is_friend=*/false))
4319 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4320 DECL_IN_AGGR_P (decl) = 0;
4321 /* Do not mark DECL as an explicit specialization if it was not
4322 already marked as an instantiation; a declaration should
4323 never be marked as a specialization unless we know what
4324 template is being specialized. */
4325 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4327 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4329 /* [temp.expl.spec] An explicit specialization of a static data
4330 member of a template is a definition if the declaration
4331 includes an initializer; otherwise, it is a declaration.
4333 We check for processing_specialization so this only applies
4334 to the new specialization syntax. */
4335 if (!initialized && processing_specialization)
4336 DECL_EXTERNAL (decl) = 1;
4339 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4340 /* Aliases are definitions. */
4342 permerror (input_location, "declaration of %q#D outside of class is not definition",
4346 was_public = TREE_PUBLIC (decl);
4348 /* Enter this declaration into the symbol table. */
4349 decl = maybe_push_decl (decl);
4351 if (processing_template_decl)
4352 decl = push_template_decl (decl);
4353 if (decl == error_mark_node)
4354 return error_mark_node;
4356 /* Tell the back end to use or not use .common as appropriate. If we say
4357 -fconserve-space, we want this to save .data space, at the expense of
4358 wrong semantics. If we say -fno-conserve-space, we want this to
4359 produce errors about redefs; to do this we force variables into the
4361 if (flag_conserve_space
4362 && TREE_CODE (decl) == VAR_DECL
4363 && TREE_PUBLIC (decl)
4364 && !DECL_THREAD_LOCAL_P (decl)
4365 && !have_global_bss_p ())
4366 DECL_COMMON (decl) = 1;
4368 if (TREE_CODE (decl) == VAR_DECL
4369 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4370 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4372 /* This is a const variable with implicit 'static'. Set
4373 DECL_THIS_STATIC so we can tell it from variables that are
4374 !TREE_PUBLIC because of the anonymous namespace. */
4375 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4376 DECL_THIS_STATIC (decl) = 1;
4379 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4380 start_decl_1 (decl, initialized);
4385 /* Process the declaration of a variable DECL. INITIALIZED is true
4386 iff DECL is explicitly initialized. (INITIALIZED is false if the
4387 variable is initialized via an implicitly-called constructor.)
4388 This function must be called for ordinary variables (including, for
4389 example, implicit instantiations of templates), but must not be
4390 called for template declarations. */
4393 start_decl_1 (tree decl, bool initialized)
4397 bool aggregate_definition_p;
4399 gcc_assert (!processing_template_decl);
4401 if (error_operand_p (decl))
4404 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4406 type = TREE_TYPE (decl);
4407 complete_p = COMPLETE_TYPE_P (type);
4408 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4410 /* If an explicit initializer is present, or if this is a definition
4411 of an aggregate, then we need a complete type at this point.
4412 (Scalars are always complete types, so there is nothing to
4413 check.) This code just sets COMPLETE_P; errors (if necessary)
4414 are issued below. */
4415 if ((initialized || aggregate_definition_p)
4417 && COMPLETE_TYPE_P (complete_type (type)))
4420 /* We will not yet have set TREE_READONLY on DECL if the type
4421 was "const", but incomplete, before this point. But, now, we
4422 have a complete type, so we can try again. */
4423 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4427 /* Is it valid for this decl to have an initializer at all? */
4429 /* Don't allow initializations for incomplete types except for
4430 arrays which might be completed by the initialization. */
4432 ; /* A complete type is ok. */
4433 else if (type_uses_auto (type))
4434 ; /* An auto type is ok. */
4435 else if (TREE_CODE (type) != ARRAY_TYPE)
4437 error ("variable %q#D has initializer but incomplete type", decl);
4438 type = TREE_TYPE (decl) = error_mark_node;
4440 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4442 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4443 error ("elements of array %q#D have incomplete type", decl);
4444 /* else we already gave an error in start_decl. */
4447 else if (aggregate_definition_p && !complete_p)
4449 if (type_uses_auto (type))
4450 error ("declaration of %q#D has no initializer", decl);
4452 error ("aggregate %q#D has incomplete type and cannot be defined",
4454 /* Change the type so that assemble_variable will give
4455 DECL an rtl we can live with: (mem (const_int 0)). */
4456 type = TREE_TYPE (decl) = error_mark_node;
4459 /* Create a new scope to hold this declaration if necessary.
4460 Whether or not a new scope is necessary cannot be determined
4461 until after the type has been completed; if the type is a
4462 specialization of a class template it is not until after
4463 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4464 will be set correctly. */
4465 maybe_push_cleanup_level (type);
4468 /* Handle initialization of references. DECL, TYPE, and INIT have the
4469 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4470 but will be set to a new CLEANUP_STMT if a temporary is created
4471 that must be destroyed subsequently.
4473 Returns an initializer expression to use to initialize DECL, or
4474 NULL if the initialization can be performed statically.
4476 Quotes on semantics can be found in ARM 8.4.3. */
4479 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4483 if (init == NULL_TREE)
4485 if ((DECL_LANG_SPECIFIC (decl) == 0
4486 || DECL_IN_AGGR_P (decl) == 0)
4487 && ! DECL_THIS_EXTERN (decl))
4488 error ("%qD declared as reference but not initialized", decl);
4492 if (TREE_CODE (init) == TREE_LIST)
4493 init = build_x_compound_expr_from_list (init, ELK_INIT,
4494 tf_warning_or_error);
4496 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4497 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4498 /* Note: default conversion is only called in very special cases. */
4499 init = decay_conversion (init);
4501 /* Convert INIT to the reference type TYPE. This may involve the
4502 creation of a temporary, whose lifetime must be the same as that
4503 of the reference. If so, a DECL_EXPR for the temporary will be
4504 added just after the DECL_EXPR for DECL. That's why we don't set
4505 DECL_INITIAL for local references (instead assigning to them
4506 explicitly); we need to allow the temporary to be initialized
4508 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4510 if (tmp == error_mark_node)
4512 else if (tmp == NULL_TREE)
4514 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4518 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4521 DECL_INITIAL (decl) = tmp;
4526 /* Subroutine of check_initializer. We're initializing a DECL of
4527 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4528 extend the lifetime of the underlying array to match that of the decl,
4529 just like for reference initialization. CLEANUP is as for
4530 grok_reference_init. */
4533 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4536 tree aggr_init, array, arrtype;
4537 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4538 if (error_operand_p (init))
4539 return error_mark_node;
4541 aggr_init = TARGET_EXPR_INITIAL (init);
4542 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4543 arrtype = TREE_TYPE (array);
4545 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4546 array = TREE_OPERAND (array, 0);
4547 /* If the array is constant, finish_compound_literal already made it a
4548 static variable and we don't need to do anything here. */
4549 if (decl && TREE_CODE (array) == TARGET_EXPR)
4551 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4552 var = build_address (var);
4553 var = convert (arrtype, var);
4554 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4559 /* Designated initializers in arrays are not supported in GNU C++.
4560 The parser cannot detect this error since it does not know whether
4561 a given brace-enclosed initializer is for a class type or for an
4562 array. This function checks that CE does not use a designated
4563 initializer. If it does, an error is issued. Returns true if CE
4564 is valid, i.e., does not have a designated initializer. */
4567 check_array_designated_initializer (const constructor_elt *ce)
4569 /* Designated initializers for array elements are not supported. */
4572 /* The parser only allows identifiers as designated
4574 if (ce->index == error_mark_node)
4575 error ("name used in a GNU-style designated "
4576 "initializer for an array");
4579 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4580 error ("name %qD used in a GNU-style designated "
4581 "initializer for an array", ce->index);
4589 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4590 array until we finish parsing the initializer. If that's the
4591 situation we're in, update DECL accordingly. */
4594 maybe_deduce_size_from_array_init (tree decl, tree init)
4596 tree type = TREE_TYPE (decl);
4598 if (TREE_CODE (type) == ARRAY_TYPE
4599 && TYPE_DOMAIN (type) == NULL_TREE
4600 && TREE_CODE (decl) != TYPE_DECL)
4602 /* do_default is really a C-ism to deal with tentative definitions.
4603 But let's leave it here to ease the eventual merge. */
4604 int do_default = !DECL_EXTERNAL (decl);
4605 tree initializer = init ? init : DECL_INITIAL (decl);
4608 /* Check that there are no designated initializers in INIT, as
4609 those are not supported in GNU C++, and as the middle-end
4610 will crash if presented with a non-numeric designated
4612 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4614 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4615 constructor_elt *ce;
4617 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4618 if (!check_array_designated_initializer (ce))
4624 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4628 error ("initializer fails to determine size of %qD", decl);
4629 TREE_TYPE (decl) = error_mark_node;
4631 else if (failure == 2)
4635 error ("array size missing in %qD", decl);
4636 TREE_TYPE (decl) = error_mark_node;
4638 /* If a `static' var's size isn't known, make it extern as
4639 well as static, so it does not get allocated. If it's not
4640 `static', then don't mark it extern; finish_incomplete_decl
4641 will give it a default size and it will get allocated. */
4642 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4643 DECL_EXTERNAL (decl) = 1;
4645 else if (failure == 3)
4647 error ("zero-size array %qD", decl);
4648 TREE_TYPE (decl) = error_mark_node;
4652 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4654 relayout_decl (decl);
4658 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4659 any appropriate error messages regarding the layout. */
4662 layout_var_decl (tree decl)
4666 type = TREE_TYPE (decl);
4667 if (type == error_mark_node)
4670 /* If we haven't already layed out this declaration, do so now.
4671 Note that we must not call complete type for an external object
4672 because it's type might involve templates that we are not
4673 supposed to instantiate yet. (And it's perfectly valid to say
4674 `extern X x' for some incomplete type `X'.) */
4675 if (!DECL_EXTERNAL (decl))
4676 complete_type (type);
4677 if (!DECL_SIZE (decl)
4678 && TREE_TYPE (decl) != error_mark_node
4679 && (COMPLETE_TYPE_P (type)
4680 || (TREE_CODE (type) == ARRAY_TYPE
4681 && !TYPE_DOMAIN (type)
4682 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4683 layout_decl (decl, 0);
4685 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4687 /* An automatic variable with an incomplete type: that is an error.
4688 Don't talk about array types here, since we took care of that
4689 message in grokdeclarator. */
4690 error ("storage size of %qD isn't known", decl);
4691 TREE_TYPE (decl) = error_mark_node;
4694 /* Keep this code around in case we later want to control debug info
4695 based on whether a type is "used". (jason 1999-11-11) */
4697 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4698 /* Let debugger know it should output info for this type. */
4699 note_debug_info_needed (ttype);
4701 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4702 note_debug_info_needed (DECL_CONTEXT (decl));
4705 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4706 && DECL_SIZE (decl) != NULL_TREE
4707 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4709 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4710 constant_expression_warning (DECL_SIZE (decl));
4713 error ("storage size of %qD isn't constant", decl);
4714 TREE_TYPE (decl) = error_mark_node;
4719 /* If a local static variable is declared in an inline function, or if
4720 we have a weak definition, we must endeavor to create only one
4721 instance of the variable at link-time. */
4724 maybe_commonize_var (tree decl)
4726 /* Static data in a function with comdat linkage also has comdat
4728 if (TREE_STATIC (decl)
4729 /* Don't mess with __FUNCTION__. */
4730 && ! DECL_ARTIFICIAL (decl)
4731 && DECL_FUNCTION_SCOPE_P (decl)
4732 && vague_linkage_p (DECL_CONTEXT (decl)))
4736 /* With weak symbols, we simply make the variable COMDAT;
4737 that will cause copies in multiple translations units to
4739 comdat_linkage (decl);
4743 if (DECL_INITIAL (decl) == NULL_TREE
4744 || DECL_INITIAL (decl) == error_mark_node)
4746 /* Without weak symbols, we can use COMMON to merge
4747 uninitialized variables. */
4748 TREE_PUBLIC (decl) = 1;
4749 DECL_COMMON (decl) = 1;
4753 /* While for initialized variables, we must use internal
4754 linkage -- which means that multiple copies will not
4756 TREE_PUBLIC (decl) = 0;
4757 DECL_COMMON (decl) = 0;
4758 warning_at (input_location, 0,
4759 "sorry: semantics of inline function static "
4760 "data %q+#D are wrong (you'll wind up "
4761 "with multiple copies)", decl);
4762 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4763 " you can work around this by removing "
4768 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4769 /* Set it up again; we might have set DECL_INITIAL since the last
4771 comdat_linkage (decl);
4774 /* Issue an error message if DECL is an uninitialized const variable. */
4777 check_for_uninitialized_const_var (tree decl)
4779 tree type = strip_array_types (TREE_TYPE (decl));
4781 /* ``Unless explicitly declared extern, a const object does not have
4782 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4784 if (TREE_CODE (decl) == VAR_DECL
4785 && TREE_CODE (type) != REFERENCE_TYPE
4786 && CP_TYPE_CONST_P (type)
4787 && (!TYPE_NEEDS_CONSTRUCTING (type)
4788 || !type_has_user_provided_default_constructor (type))
4789 && !DECL_INITIAL (decl))
4791 permerror (DECL_SOURCE_LOCATION (decl),
4792 "uninitialized const %qD", decl);
4794 if (CLASS_TYPE_P (type)
4795 && !type_has_user_provided_default_constructor (type))
4797 tree defaulted_ctor;
4799 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4800 "%q#T has no user-provided default constructor", type);
4801 defaulted_ctor = in_class_defaulted_default_constructor (type);
4803 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4804 "constructor is not user-provided because it is "
4805 "explicitly defaulted in the class body");
4810 /* Structure holding the current initializer being processed by reshape_init.
4811 CUR is a pointer to the current element being processed, END is a pointer
4812 after the last element present in the initializer. */
4813 typedef struct reshape_iterator_t
4815 constructor_elt *cur;
4816 constructor_elt *end;
4819 static tree reshape_init_r (tree, reshape_iter *, bool);
4821 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4822 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4823 initialized. If there are no more such fields, the return value
4827 next_initializable_field (tree field)
4830 && (TREE_CODE (field) != FIELD_DECL
4831 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4832 || DECL_ARTIFICIAL (field)))
4833 field = DECL_CHAIN (field);
4838 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4839 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4840 INTEGER_CST representing the size of the array minus one (the maximum index),
4841 or NULL_TREE if the array was declared without specifying the size. D is
4842 the iterator within the constructor. */
4845 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4848 bool sized_array_p = (max_index != NULL_TREE);
4849 unsigned HOST_WIDE_INT max_index_cst = 0;
4850 unsigned HOST_WIDE_INT index;
4852 /* The initializer for an array is always a CONSTRUCTOR. */
4853 new_init = build_constructor (init_list_type_node, NULL);
4857 /* Minus 1 is used for zero sized arrays. */
4858 if (integer_all_onesp (max_index))
4861 if (host_integerp (max_index, 1))
4862 max_index_cst = tree_low_cst (max_index, 1);
4863 /* sizetype is sign extended, not zero extended. */
4865 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4869 /* Loop until there are no more initializers. */
4871 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4876 check_array_designated_initializer (d->cur);
4877 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4878 if (elt_init == error_mark_node)
4879 return error_mark_node;
4880 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4886 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4887 Parameters are the same of reshape_init_r. */
4890 reshape_init_array (tree type, reshape_iter *d)
4892 tree max_index = NULL_TREE;
4894 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4896 if (TYPE_DOMAIN (type))
4897 max_index = array_type_nelts (type);
4899 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4902 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4903 Parameters are the same of reshape_init_r. */
4906 reshape_init_vector (tree type, reshape_iter *d)
4908 tree max_index = NULL_TREE;
4910 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4912 if (COMPOUND_LITERAL_P (d->cur->value))
4914 tree value = d->cur->value;
4915 if (!same_type_p (TREE_TYPE (value), type))
4917 error ("invalid type %qT as initializer for a vector of type %qT",
4918 TREE_TYPE (d->cur->value), type);
4919 value = error_mark_node;
4925 /* For a vector, we initialize it as an array of the appropriate size. */
4926 if (TREE_CODE (type) == VECTOR_TYPE)
4927 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4929 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4932 /* Subroutine of reshape_init_r, processes the initializers for classes
4933 or union. Parameters are the same of reshape_init_r. */
4936 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4941 gcc_assert (CLASS_TYPE_P (type));
4943 /* The initializer for a class is always a CONSTRUCTOR. */
4944 new_init = build_constructor (init_list_type_node, NULL);
4945 field = next_initializable_field (TYPE_FIELDS (type));
4951 An initializer for an aggregate member that is an
4952 empty class shall have the form of an empty
4953 initializer-list {}. */
4954 if (!first_initializer_p)
4956 error ("initializer for %qT must be brace-enclosed", type);
4957 return error_mark_node;
4962 /* Loop through the initializable fields, gathering initializers. */
4963 while (d->cur != d->end)
4967 /* Handle designated initializers, as an extension. */
4970 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4972 if (!field || TREE_CODE (field) != FIELD_DECL)
4974 error ("%qT has no non-static data member named %qD", type,
4976 return error_mark_node;
4980 /* If we processed all the member of the class, we are done. */
4984 field_init = reshape_init_r (TREE_TYPE (field), d,
4985 /*first_initializer_p=*/false);
4986 if (field_init == error_mark_node)
4987 return error_mark_node;
4989 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4993 When a union is initialized with a brace-enclosed
4994 initializer, the braces shall only contain an
4995 initializer for the first member of the union. */
4996 if (TREE_CODE (type) == UNION_TYPE)
4999 field = next_initializable_field (DECL_CHAIN (field));
5005 /* Subroutine of reshape_init, which processes a single initializer (part of
5006 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5007 iterator within the CONSTRUCTOR which points to the initializer to process.
5008 FIRST_INITIALIZER_P is true if this is the first initializer of the
5009 outermost CONSTRUCTOR node. */
5012 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5014 tree init = d->cur->value;
5016 if (error_operand_p (init))
5017 return error_mark_node;
5019 /* A non-aggregate type is always initialized with a single
5021 if (!CP_AGGREGATE_TYPE_P (type))
5023 /* It is invalid to initialize a non-aggregate type with a
5024 brace-enclosed initializer before C++0x.
5025 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5026 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5027 a CONSTRUCTOR (with a record type). */
5028 if (TREE_CODE (init) == CONSTRUCTOR
5029 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5031 if (SCALAR_TYPE_P (type))
5033 error ("braces around scalar initializer for type %qT", type);
5034 init = error_mark_node;
5037 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5046 All implicit type conversions (clause _conv_) are considered when
5047 initializing the aggregate member with an initializer from an
5048 initializer-list. If the initializer can initialize a member,
5049 the member is initialized. Otherwise, if the member is itself a
5050 non-empty subaggregate, brace elision is assumed and the
5051 initializer is considered for the initialization of the first
5052 member of the subaggregate. */
5053 if (TREE_CODE (init) != CONSTRUCTOR
5054 /* But don't try this for the first initializer, since that would be
5055 looking through the outermost braces; A a2 = { a1 }; is not a
5056 valid aggregate initialization. */
5057 && !first_initializer_p
5058 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5059 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5065 /* [dcl.init.string]
5067 A char array (whether plain char, signed char, or unsigned char)
5068 can be initialized by a string-literal (optionally enclosed in
5069 braces); a wchar_t array can be initialized by a wide
5070 string-literal (optionally enclosed in braces). */
5071 if (TREE_CODE (type) == ARRAY_TYPE
5072 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5074 tree str_init = init;
5076 /* Strip one level of braces if and only if they enclose a single
5077 element (as allowed by [dcl.init.string]). */
5078 if (!first_initializer_p
5079 && TREE_CODE (str_init) == CONSTRUCTOR
5080 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5082 str_init = VEC_index (constructor_elt,
5083 CONSTRUCTOR_ELTS (str_init), 0)->value;
5086 /* If it's a string literal, then it's the initializer for the array
5087 as a whole. Otherwise, continue with normal initialization for
5088 array types (one value per array element). */
5089 if (TREE_CODE (str_init) == STRING_CST)
5096 /* The following cases are about aggregates. If we are not within a full
5097 initializer already, and there is not a CONSTRUCTOR, it means that there
5098 is a missing set of braces (that is, we are processing the case for
5099 which reshape_init exists). */
5100 if (!first_initializer_p)
5102 if (TREE_CODE (init) == CONSTRUCTOR)
5104 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5105 /* There is no need to reshape pointer-to-member function
5106 initializers, as they are always constructed correctly
5107 by the front end. */
5109 else if (COMPOUND_LITERAL_P (init))
5110 /* For a nested compound literal, there is no need to reshape since
5111 brace elision is not allowed. Even if we decided to allow it,
5112 we should add a call to reshape_init in finish_compound_literal,
5113 before calling digest_init, so changing this code would still
5114 not be necessary. */
5115 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5119 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5120 return reshape_init (type, init);
5124 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5128 /* Dispatch to specialized routines. */
5129 if (CLASS_TYPE_P (type))
5130 return reshape_init_class (type, d, first_initializer_p);
5131 else if (TREE_CODE (type) == ARRAY_TYPE)
5132 return reshape_init_array (type, d);
5133 else if (TREE_CODE (type) == VECTOR_TYPE)
5134 return reshape_init_vector (type, d);
5139 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5140 brace-enclosed aggregate initializer.
5142 INIT is the CONSTRUCTOR containing the list of initializers describing
5143 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5144 It may not presently match the shape of the TYPE; for example:
5146 struct S { int a; int b; };
5147 struct S a[] = { 1, 2, 3, 4 };
5149 Here INIT will hold a VEC of four elements, rather than a
5150 VEC of two elements, each itself a VEC of two elements. This
5151 routine transforms INIT from the former form into the latter. The
5152 revised CONSTRUCTOR node is returned. */
5155 reshape_init (tree type, tree init)
5157 VEC(constructor_elt, gc) *v;
5161 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5163 v = CONSTRUCTOR_ELTS (init);
5165 /* An empty constructor does not need reshaping, and it is always a valid
5167 if (VEC_empty (constructor_elt, v))
5170 /* Recurse on this CONSTRUCTOR. */
5171 d.cur = VEC_index (constructor_elt, v, 0);
5172 d.end = d.cur + VEC_length (constructor_elt, v);
5174 new_init = reshape_init_r (type, &d, true);
5175 if (new_init == error_mark_node)
5176 return error_mark_node;
5178 /* Make sure all the element of the constructor were used. Otherwise,
5179 issue an error about exceeding initializers. */
5181 error ("too many initializers for %qT", type);
5186 /* Verify array initializer. Returns true if errors have been reported. */
5189 check_array_initializer (tree decl, tree type, tree init)
5191 tree element_type = TREE_TYPE (type);
5193 /* The array type itself need not be complete, because the
5194 initializer may tell us how many elements are in the array.
5195 But, the elements of the array must be complete. */
5196 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5199 error ("elements of array %q#D have incomplete type", decl);
5201 error ("elements of array %q#T have incomplete type", type);
5204 /* It is not valid to initialize a VLA. */
5206 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5207 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5210 error ("variable-sized object %qD may not be initialized", decl);
5212 error ("variable-sized compound literal");
5218 /* Subroutine of check_initializer; args are passed down from that function.
5219 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5222 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5225 int saved_stmts_are_full_exprs_p = 0;
5226 if (building_stmt_tree ())
5228 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5229 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5231 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5232 if (building_stmt_tree ())
5233 current_stmt_tree ()->stmts_are_full_exprs_p =
5234 saved_stmts_are_full_exprs_p;
5238 /* Verify INIT (the initializer for DECL), and record the
5239 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5240 grok_reference_init.
5242 If the return value is non-NULL, it is an expression that must be
5243 evaluated dynamically to initialize DECL. */
5246 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5248 tree type = TREE_TYPE (decl);
5249 tree init_code = NULL;
5250 tree extra_init = NULL_TREE;
5253 /* Things that are going to be initialized need to have complete
5255 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5257 if (type == error_mark_node)
5258 /* We will have already complained. */
5261 if (TREE_CODE (type) == ARRAY_TYPE)
5263 if (check_array_initializer (decl, type, init))
5266 else if (!COMPLETE_TYPE_P (type))
5268 error ("%qD has incomplete type", decl);
5269 TREE_TYPE (decl) = error_mark_node;
5273 /* There is no way to make a variable-sized class type in GNU C++. */
5274 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5276 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5278 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5279 if (SCALAR_TYPE_P (type))
5283 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5284 init = build_zero_init (type, NULL_TREE, false);
5286 else if (init_len != 1)
5288 error ("scalar object %qD requires one element in initializer",
5290 TREE_TYPE (decl) = error_mark_node;
5296 if (TREE_CODE (decl) == CONST_DECL)
5298 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5300 DECL_INITIAL (decl) = init;
5302 gcc_assert (init != NULL_TREE);
5305 else if (!init && DECL_REALLY_EXTERN (decl))
5307 else if (TREE_CODE (type) == REFERENCE_TYPE)
5308 init = grok_reference_init (decl, type, init, cleanup);
5309 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5312 check_for_uninitialized_const_var (decl);
5313 /* Do not reshape constructors of vectors (they don't need to be
5315 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5317 if (is_std_init_list (type))
5318 init = build_init_list_var_init (decl, type, init,
5319 &extra_init, cleanup);
5320 else if (TYPE_NON_AGGREGATE_CLASS (type))
5322 /* Don't reshape if the class has constructors. */
5323 if (cxx_dialect == cxx98)
5324 error ("in C++98 %qD must be initialized by constructor, "
5328 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5330 error ("opaque vector types cannot be initialized");
5331 init = error_mark_node;
5334 init = reshape_init (type, init);
5337 /* If DECL has an array type without a specific bound, deduce the
5338 array size from the initializer. */
5339 maybe_deduce_size_from_array_init (decl, init);
5340 type = TREE_TYPE (decl);
5341 if (type == error_mark_node)
5344 if (TYPE_NEEDS_CONSTRUCTING (type)
5345 || (CLASS_TYPE_P (type)
5346 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5348 init_code = build_aggr_init_full_exprs (decl, init, flags);
5350 /* If this is a constexpr initializer, expand_default_init will
5351 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5352 case, pull the initializer back out and pass it down into
5353 store_init_value. */
5354 while (TREE_CODE (init_code) == EXPR_STMT
5355 || TREE_CODE (init_code) == CONVERT_EXPR)
5356 init_code = TREE_OPERAND (init_code, 0);
5357 if (TREE_CODE (init_code) == INIT_EXPR)
5359 init = TREE_OPERAND (init_code, 1);
5360 init_code = NULL_TREE;
5361 /* Don't call digest_init; it's unnecessary and will complain
5362 about aggregate initialization of non-aggregate classes. */
5363 flags |= LOOKUP_ALREADY_DIGESTED;
5365 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5367 /* Declared constexpr, but no suitable initializer; massage
5368 init appropriately so we can pass it into store_init_value
5370 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5371 init = finish_compound_literal (type, init);
5372 else if (CLASS_TYPE_P (type)
5373 && (!init || TREE_CODE (init) == TREE_LIST))
5375 init = build_functional_cast (type, init, tf_none);
5376 if (init != error_mark_node)
5377 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5379 init_code = NULL_TREE;
5385 if (init && TREE_CODE (init) != TREE_VEC)
5387 init_code = store_init_value (decl, init, flags);
5388 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5389 && DECL_INITIAL (decl)
5390 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5391 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5392 warning (0, "array %qD initialized by parenthesized string literal %qE",
5393 decl, DECL_INITIAL (decl));
5399 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5400 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5401 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5402 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5405 check_for_uninitialized_const_var (decl);
5408 if (init && init != error_mark_node)
5409 init_code = build2 (INIT_EXPR, type, decl, init);
5412 init_code = add_stmt_to_compound (extra_init, init_code);
5414 if (init_code && DECL_IN_AGGR_P (decl))
5416 static int explained = 0;
5418 if (cxx_dialect < cxx0x)
5419 error ("initializer invalid for static member with constructor");
5421 error ("non-constant in-class initialization invalid for static "
5422 "member %qD", decl);
5425 error ("(an out of class initialization is required)");
5433 /* If DECL is not a local variable, give it RTL. */
5436 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5438 int toplev = toplevel_bindings_p ();
5440 const char *filename;
5442 /* Set the DECL_ASSEMBLER_NAME for the object. */
5445 /* The `register' keyword, when used together with an
5446 asm-specification, indicates that the variable should be
5447 placed in a particular register. */
5448 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5450 set_user_assembler_name (decl, asmspec);
5451 DECL_HARD_REGISTER (decl) = 1;
5455 if (TREE_CODE (decl) == FUNCTION_DECL
5456 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5457 set_builtin_user_assembler_name (decl, asmspec);
5458 set_user_assembler_name (decl, asmspec);
5462 /* Handle non-variables up front. */
5463 if (TREE_CODE (decl) != VAR_DECL)
5465 rest_of_decl_compilation (decl, toplev, at_eof);
5469 /* If we see a class member here, it should be a static data
5471 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5473 gcc_assert (TREE_STATIC (decl));
5474 /* An in-class declaration of a static data member should be
5475 external; it is only a declaration, and not a definition. */
5476 if (init == NULL_TREE)
5477 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5480 /* We don't create any RTL for local variables. */
5481 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5484 /* We defer emission of local statics until the corresponding
5485 DECL_EXPR is expanded. */
5486 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5488 /* We try to defer namespace-scope static constants so that they are
5489 not emitted into the object file unnecessarily. */
5490 filename = input_filename;
5491 if (!DECL_VIRTUAL_P (decl)
5492 && TREE_READONLY (decl)
5493 && DECL_INITIAL (decl) != NULL_TREE
5494 && DECL_INITIAL (decl) != error_mark_node
5496 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5498 && !TREE_PUBLIC (decl))
5500 /* Fool with the linkage of static consts according to #pragma
5502 struct c_fileinfo *finfo = get_fileinfo (filename);
5503 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5505 TREE_PUBLIC (decl) = 1;
5506 DECL_EXTERNAL (decl) = finfo->interface_only;
5511 /* Likewise for template instantiations. */
5512 else if (DECL_LANG_SPECIFIC (decl)
5513 && DECL_IMPLICIT_INSTANTIATION (decl))
5516 /* If we're not deferring, go ahead and assemble the variable. */
5518 rest_of_decl_compilation (decl, toplev, at_eof);
5521 /* walk_tree helper for wrap_temporary_cleanups, below. */
5524 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5526 if (TYPE_P (*stmt_p))
5532 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5534 tree guard = (tree)data;
5535 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5537 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5538 /* Tell honor_protect_cleanup_actions to handle this as a separate
5540 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5542 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5548 /* We're initializing a local variable which has a cleanup GUARD. If there
5549 are any temporaries used in the initializer INIT of this variable, we
5550 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5551 variable will be cleaned up properly if one of them throws.
5553 Unfortunately, there's no way to express this properly in terms of
5554 nesting, as the regions for the temporaries overlap the region for the
5555 variable itself; if there are two temporaries, the variable needs to be
5556 the first thing destroyed if either of them throws. However, we only
5557 want to run the variable's cleanup if it actually got constructed. So
5558 we need to guard the temporary cleanups with the variable's cleanup if
5559 they are run on the normal path, but not if they are run on the
5560 exceptional path. We implement this by telling
5561 honor_protect_cleanup_actions to strip the variable cleanup from the
5562 exceptional path. */
5565 wrap_temporary_cleanups (tree init, tree guard)
5567 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5570 /* Generate code to initialize DECL (a local variable). */
5573 initialize_local_var (tree decl, tree init)
5575 tree type = TREE_TYPE (decl);
5579 gcc_assert (TREE_CODE (decl) == VAR_DECL
5580 || TREE_CODE (decl) == RESULT_DECL);
5581 gcc_assert (!TREE_STATIC (decl));
5583 if (DECL_SIZE (decl) == NULL_TREE)
5585 /* If we used it already as memory, it must stay in memory. */
5586 DECL_INITIAL (decl) = NULL_TREE;
5587 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5591 if (type == error_mark_node)
5594 /* Compute and store the initial value. */
5595 already_used = TREE_USED (decl) || TREE_USED (type);
5596 if (TREE_USED (type))
5597 DECL_READ_P (decl) = 1;
5599 /* Generate a cleanup, if necessary. */
5600 cleanup = cxx_maybe_build_cleanup (decl);
5602 /* Perform the initialization. */
5605 int saved_stmts_are_full_exprs_p;
5607 /* If we're only initializing a single object, guard the destructors
5608 of any temporaries used in its initializer with its destructor.
5609 This isn't right for arrays because each element initialization is
5610 a full-expression. */
5611 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5612 wrap_temporary_cleanups (init, cleanup);
5614 gcc_assert (building_stmt_tree ());
5615 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5616 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5617 finish_expr_stmt (init);
5618 current_stmt_tree ()->stmts_are_full_exprs_p =
5619 saved_stmts_are_full_exprs_p;
5622 /* Set this to 0 so we can tell whether an aggregate which was
5623 initialized was ever used. Don't do this if it has a
5624 destructor, so we don't complain about the 'resource
5625 allocation is initialization' idiom. Now set
5626 attribute((unused)) on types so decls of that type will be
5627 marked used. (see TREE_USED, above.) */
5628 if (TYPE_NEEDS_CONSTRUCTING (type)
5630 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5631 && DECL_NAME (decl))
5632 TREE_USED (decl) = 0;
5633 else if (already_used)
5634 TREE_USED (decl) = 1;
5637 finish_decl_cleanup (decl, cleanup);
5640 /* DECL is a VAR_DECL for a compiler-generated variable with static
5641 storage duration (like a virtual table) whose initializer is a
5642 compile-time constant. Initialize the variable and provide it to the
5646 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5649 gcc_assert (DECL_ARTIFICIAL (decl));
5650 init = build_constructor (TREE_TYPE (decl), v);
5651 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5652 DECL_INITIAL (decl) = init;
5653 DECL_INITIALIZED_P (decl) = 1;
5654 determine_visibility (decl);
5655 layout_var_decl (decl);
5656 maybe_commonize_var (decl);
5657 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5660 /* INIT is the initializer for a variable, as represented by the
5661 parser. Returns true iff INIT is value-dependent. */
5664 value_dependent_init_p (tree init)
5666 if (TREE_CODE (init) == TREE_LIST)
5667 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5668 return any_value_dependent_elements_p (init);
5669 else if (TREE_CODE (init) == CONSTRUCTOR)
5670 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5672 VEC(constructor_elt, gc) *elts;
5676 elts = CONSTRUCTOR_ELTS (init);
5677 nelts = VEC_length (constructor_elt, elts);
5678 for (i = 0; i < nelts; ++i)
5679 if (value_dependent_init_p (VEC_index (constructor_elt,
5684 /* It must be a simple expression, e.g., int i = 3; */
5685 return value_dependent_expression_p (init);
5690 /* Finish processing of a declaration;
5691 install its line number and initial value.
5692 If the length of an array type is not known before,
5693 it must be determined now, from the initial value, or it is an error.
5695 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5696 true, then INIT is an integral constant expression.
5698 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5699 if the (init) syntax was used. */
5702 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5703 tree asmspec_tree, int flags)
5707 const char *asmspec = NULL;
5708 int was_readonly = 0;
5709 bool var_definition_p = false;
5710 int saved_processing_template_decl;
5713 if (decl == error_mark_node)
5718 error ("assignment (not initialization) in declaration");
5722 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5723 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5724 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5726 type = TREE_TYPE (decl);
5727 if (type == error_mark_node)
5730 /* Assume no cleanup is required. */
5731 cleanup = NULL_TREE;
5732 saved_processing_template_decl = processing_template_decl;
5734 /* If a name was specified, get the string. */
5735 if (global_scope_p (current_binding_level))
5736 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5737 if (asmspec_tree && asmspec_tree != error_mark_node)
5738 asmspec = TREE_STRING_POINTER (asmspec_tree);
5740 if (current_class_type
5741 && CP_DECL_CONTEXT (decl) == current_class_type
5742 && TYPE_BEING_DEFINED (current_class_type)
5743 && (DECL_INITIAL (decl) || init))
5744 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5746 auto_node = type_uses_auto (type);
5750 if (init == NULL_TREE)
5752 error ("declaration of %q#D has no initializer", decl);
5753 TREE_TYPE (decl) = error_mark_node;
5757 if (TREE_CODE (d_init) == TREE_LIST)
5758 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5759 tf_warning_or_error);
5760 if (describable_type (d_init))
5762 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5764 if (type == error_mark_node)
5769 if (TREE_CODE (decl) == FUNCTION_DECL)
5770 validate_constexpr_fundecl (decl);
5772 else if (!ensure_literal_type_for_constexpr_object (decl))
5773 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5775 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5778 if (init == ridpointers[(int)RID_DELETE])
5780 /* FIXME check this is 1st decl. */
5781 DECL_DELETED_FN (decl) = 1;
5782 DECL_DECLARED_INLINE_P (decl) = 1;
5783 DECL_INITIAL (decl) = error_mark_node;
5784 FOR_EACH_CLONE (clone, decl)
5786 DECL_DELETED_FN (clone) = 1;
5787 DECL_DECLARED_INLINE_P (clone) = 1;
5788 DECL_INITIAL (clone) = error_mark_node;
5792 else if (init == ridpointers[(int)RID_DEFAULT])
5794 if (defaultable_fn_check (decl))
5795 DECL_DEFAULTED_FN (decl) = 1;
5797 DECL_INITIAL (decl) = NULL_TREE;
5801 if (init && TREE_CODE (decl) == VAR_DECL)
5803 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5804 /* FIXME we rely on TREE_CONSTANT below; basing that on
5805 init_const_expr_p is probably wrong for C++0x. */
5806 if (init_const_expr_p)
5808 /* Set these flags now for C++98 templates. We'll update the
5809 flags in store_init_value for instantiations and C++0x. */
5810 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5811 if (decl_maybe_constant_var_p (decl))
5812 TREE_CONSTANT (decl) = 1;
5816 if (processing_template_decl)
5818 bool type_dependent_p;
5820 /* Add this declaration to the statement-tree. */
5821 if (at_function_scope_p ())
5822 add_decl_expr (decl);
5824 type_dependent_p = dependent_type_p (type);
5826 if (check_for_bare_parameter_packs (init))
5829 DECL_INITIAL (decl) = NULL_TREE;
5832 /* Generally, initializers in templates are expanded when the
5833 template is instantiated. But, if DECL is a variable constant
5834 then it can be used in future constant expressions, so its value
5835 must be available. */
5837 && DECL_CLASS_SCOPE_P (decl)
5838 /* We just set TREE_CONSTANT appropriately; see above. */
5839 && TREE_CONSTANT (decl)
5840 && !type_dependent_p
5841 /* FIXME non-value-dependent constant expression */
5842 && !value_dependent_init_p (init)))
5845 DECL_INITIAL (decl) = init;
5846 if (TREE_CODE (decl) == VAR_DECL
5847 && !DECL_PRETTY_FUNCTION_P (decl)
5848 && !type_dependent_p)
5849 maybe_deduce_size_from_array_init (decl, init);
5853 if (TREE_CODE (init) == TREE_LIST)
5855 /* If the parenthesized-initializer form was used (e.g.,
5856 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5857 arguments. (There is generally only one.) We convert them
5860 for (; list; list = TREE_CHAIN (list))
5862 tree elt = TREE_VALUE (list);
5863 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5867 init = fold_non_dependent_expr (init);
5868 processing_template_decl = 0;
5871 /* Take care of TYPE_DECLs up front. */
5872 if (TREE_CODE (decl) == TYPE_DECL)
5874 if (type != error_mark_node
5875 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5877 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5878 warning (0, "shadowing previous type declaration of %q#D", decl);
5879 set_identifier_type_value (DECL_NAME (decl), decl);
5882 /* If we have installed this as the canonical typedef for this
5883 type, and that type has not been defined yet, delay emitting
5884 the debug information for it, as we will emit it later. */
5885 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5886 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5887 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5889 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5894 /* A reference will be modified here, as it is initialized. */
5895 if (! DECL_EXTERNAL (decl)
5896 && TREE_READONLY (decl)
5897 && TREE_CODE (type) == REFERENCE_TYPE)
5900 TREE_READONLY (decl) = 0;
5903 if (TREE_CODE (decl) == VAR_DECL)
5905 /* Only variables with trivial initialization and destruction can
5906 have thread-local storage. */
5907 if (DECL_THREAD_LOCAL_P (decl)
5908 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5909 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5910 error ("%qD cannot be thread-local because it has non-trivial "
5911 "type %qT", decl, TREE_TYPE (decl));
5912 /* If this is a local variable that will need a mangled name,
5913 register it now. We must do this before processing the
5914 initializer for the variable, since the initialization might
5915 require a guard variable, and since the mangled name of the
5916 guard variable will depend on the mangled name of this
5918 if (DECL_FUNCTION_SCOPE_P (decl)
5919 && TREE_STATIC (decl)
5920 && !DECL_ARTIFICIAL (decl))
5922 push_local_name (decl);
5923 if (DECL_CONSTRUCTOR_P (current_function_decl)
5924 || DECL_DESTRUCTOR_P (current_function_decl))
5925 /* Normally local_decls is populated during GIMPLE lowering,
5926 but [cd]tors are never actually compiled directly. We need
5927 to put statics on the list so we can deal with the label
5928 address extension. */
5929 add_local_decl (cfun, decl);
5932 /* Convert the initializer to the type of DECL, if we have not
5933 already initialized DECL. */
5934 if (!DECL_INITIALIZED_P (decl)
5935 /* If !DECL_EXTERNAL then DECL is being defined. In the
5936 case of a static data member initialized inside the
5937 class-specifier, there can be an initializer even if DECL
5938 is *not* defined. */
5939 && (!DECL_EXTERNAL (decl) || init))
5941 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5944 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5945 /* Allow libjava/prims.cc define primitive classes. */
5946 if (init != NULL_TREE
5947 || jclass == NULL_TREE
5948 || TREE_CODE (jclass) != TYPE_DECL
5949 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5950 || !same_type_ignoring_top_level_qualifiers_p
5951 (type, TREE_TYPE (TREE_TYPE (jclass))))
5952 error ("Java object %qD not allocated with %<new%>", decl);
5955 init = check_initializer (decl, init, flags, &cleanup);
5956 /* Thread-local storage cannot be dynamically initialized. */
5957 if (DECL_THREAD_LOCAL_P (decl) && init)
5959 error ("%qD is thread-local and so cannot be dynamically "
5960 "initialized", decl);
5964 /* Check that the initializer for a static data member was a
5965 constant. Although we check in the parser that the
5966 initializer is an integral constant expression, we do not
5967 simplify division-by-zero at the point at which it
5968 occurs. Therefore, in:
5970 struct S { static const int i = 7 / 0; };
5972 we issue an error at this point. It would
5973 probably be better to forbid division by zero in
5974 integral constant expressions. */
5975 if (DECL_EXTERNAL (decl) && init)
5977 error ("%qD cannot be initialized by a non-constant expression"
5978 " when being declared", decl);
5979 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5987 The memory occupied by any object of static storage
5988 duration is zero-initialized at program startup before
5989 any other initialization takes place.
5991 We cannot create an appropriate initializer until after
5992 the type of DECL is finalized. If DECL_INITIAL is set,
5993 then the DECL is statically initialized, and any
5994 necessary zero-initialization has already been performed. */
5995 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5996 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5997 /*nelts=*/NULL_TREE,
5998 /*static_storage_p=*/true);
5999 /* Remember that the initialization for this variable has
6001 DECL_INITIALIZED_P (decl) = 1;
6002 /* This declaration is the definition of this variable,
6003 unless we are initializing a static data member within
6004 the class specifier. */
6005 if (!DECL_EXTERNAL (decl))
6006 var_definition_p = true;
6008 /* If the variable has an array type, lay out the type, even if
6009 there is no initializer. It is valid to index through the
6010 array, and we must get TYPE_ALIGN set correctly on the array
6012 else if (TREE_CODE (type) == ARRAY_TYPE)
6015 if (!processing_template_decl
6016 && TREE_STATIC (decl)
6017 && !at_function_scope_p ()
6018 && current_function_decl == NULL)
6019 /* So decl is a global variable or a static member of a
6020 non local class. Record the types it uses
6021 so that we can decide later to emit debug info for them. */
6022 record_types_used_by_current_var_decl (decl);
6024 else if (TREE_CODE (decl) == FIELD_DECL
6025 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6026 error ("non-static data member %qD has Java class type", decl);
6028 /* Add this declaration to the statement-tree. This needs to happen
6029 after the call to check_initializer so that the DECL_EXPR for a
6030 reference temp is added before the DECL_EXPR for the reference itself. */
6031 if (at_function_scope_p ())
6032 add_decl_expr (decl);
6034 /* Let the middle end know about variables and functions -- but not
6035 static data members in uninstantiated class templates. */
6036 if (!saved_processing_template_decl
6037 && (TREE_CODE (decl) == VAR_DECL
6038 || TREE_CODE (decl) == FUNCTION_DECL))
6040 if (TREE_CODE (decl) == VAR_DECL)
6042 layout_var_decl (decl);
6043 maybe_commonize_var (decl);
6046 /* This needs to happen after the linkage is set. */
6047 determine_visibility (decl);
6049 if (var_definition_p && TREE_STATIC (decl))
6051 /* If a TREE_READONLY variable needs initialization
6052 at runtime, it is no longer readonly and we need to
6053 avoid MEM_READONLY_P being set on RTL created for it. */
6056 if (TREE_READONLY (decl))
6057 TREE_READONLY (decl) = 0;
6060 else if (was_readonly)
6061 TREE_READONLY (decl) = 1;
6064 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6066 /* Check for abstractness of the type. Notice that there is no
6067 need to strip array types here since the check for those types
6068 is already done within create_array_type_for_decl. */
6069 if (TREE_CODE (type) == FUNCTION_TYPE
6070 || TREE_CODE (type) == METHOD_TYPE)
6071 abstract_virtuals_error (decl, TREE_TYPE (type));
6073 abstract_virtuals_error (decl, type);
6075 if (TREE_TYPE (decl) == error_mark_node)
6076 /* No initialization required. */
6078 else if (TREE_CODE (decl) == FUNCTION_DECL)
6082 if (init == ridpointers[(int)RID_DEFAULT])
6084 /* An out-of-class default definition is defined at
6085 the point where it is explicitly defaulted. */
6086 if (DECL_INITIAL (decl) == error_mark_node)
6087 synthesize_method (decl);
6090 error ("function %q#D is initialized like a variable", decl);
6092 /* else no initialization required. */
6094 else if (DECL_EXTERNAL (decl)
6095 && ! (DECL_LANG_SPECIFIC (decl)
6096 && DECL_NOT_REALLY_EXTERN (decl)))
6099 DECL_INITIAL (decl) = init;
6101 /* A variable definition. */
6102 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6103 /* Initialize the local variable. */
6104 initialize_local_var (decl, init);
6106 /* If a variable is defined, and then a subsequent
6107 definition with external linkage is encountered, we will
6108 get here twice for the same variable. We want to avoid
6109 calling expand_static_init more than once. For variables
6110 that are not static data members, we can call
6111 expand_static_init only when we actually process the
6112 initializer. It is not legal to redeclare a static data
6113 member, so this issue does not arise in that case. */
6114 else if (var_definition_p && TREE_STATIC (decl))
6115 expand_static_init (decl, init);
6118 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6119 reference, insert it in the statement-tree now. */
6121 push_cleanup (decl, cleanup, false);
6124 processing_template_decl = saved_processing_template_decl;
6127 TREE_READONLY (decl) = 1;
6130 /* Returns a declaration for a VAR_DECL as if:
6132 extern "C" TYPE NAME;
6134 had been seen. Used to create compiler-generated global
6138 declare_global_var (tree name, tree type)
6142 push_to_top_level ();
6143 decl = build_decl (input_location, VAR_DECL, name, type);
6144 TREE_PUBLIC (decl) = 1;
6145 DECL_EXTERNAL (decl) = 1;
6146 DECL_ARTIFICIAL (decl) = 1;
6147 /* If the user has explicitly declared this variable (perhaps
6148 because the code we are compiling is part of a low-level runtime
6149 library), then it is possible that our declaration will be merged
6150 with theirs by pushdecl. */
6151 decl = pushdecl (decl);
6152 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6153 pop_from_top_level ();
6158 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6159 if "__cxa_atexit" is not being used) corresponding to the function
6160 to be called when the program exits. */
6163 get_atexit_fn_ptr_type (void)
6167 if (!atexit_fn_ptr_type_node)
6170 if (flag_use_cxa_atexit
6171 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6172 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6173 arg_type = ptr_type_node;
6175 /* The parameter to "atexit" is "void (*)(void)". */
6176 arg_type = NULL_TREE;
6178 fn_type = build_function_type_list (void_type_node,
6179 arg_type, NULL_TREE);
6180 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6183 return atexit_fn_ptr_type_node;
6186 /* Returns a pointer to the `atexit' function. Note that if
6187 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6188 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6191 get_atexit_node (void)
6197 bool use_aeabi_atexit;
6202 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6204 /* The declaration for `__cxa_atexit' is:
6206 int __cxa_atexit (void (*)(void *), void *, void *)
6208 We build up the argument types and then the function type
6210 tree argtype0, argtype1, argtype2;
6212 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6213 /* First, build the pointer-to-function type for the first
6215 fn_ptr_type = get_atexit_fn_ptr_type ();
6216 /* Then, build the rest of the argument types. */
6217 argtype2 = ptr_type_node;
6218 if (use_aeabi_atexit)
6220 argtype1 = fn_ptr_type;
6221 argtype0 = ptr_type_node;
6225 argtype1 = ptr_type_node;
6226 argtype0 = fn_ptr_type;
6228 /* And the final __cxa_atexit type. */
6229 fn_type = build_function_type_list (integer_type_node,
6230 argtype0, argtype1, argtype2,
6232 fn_ptr_type = build_pointer_type (fn_type);
6233 if (use_aeabi_atexit)
6234 name = "__aeabi_atexit";
6236 name = "__cxa_atexit";
6240 /* The declaration for `atexit' is:
6242 int atexit (void (*)());
6244 We build up the argument types and then the function type
6246 fn_ptr_type = get_atexit_fn_ptr_type ();
6247 /* Build the final atexit type. */
6248 fn_type = build_function_type_list (integer_type_node,
6249 fn_ptr_type, NULL_TREE);
6253 /* Now, build the function declaration. */
6254 push_lang_context (lang_name_c);
6255 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6256 mark_used (atexit_fndecl);
6257 pop_lang_context ();
6258 atexit_node = decay_conversion (atexit_fndecl);
6263 /* Returns the __dso_handle VAR_DECL. */
6266 get_dso_handle_node (void)
6268 if (dso_handle_node)
6269 return dso_handle_node;
6271 /* Declare the variable. */
6272 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6275 return dso_handle_node;
6278 /* Begin a new function with internal linkage whose job will be simply
6279 to destroy some particular variable. */
6281 static GTY(()) int start_cleanup_cnt;
6284 start_cleanup_fn (void)
6289 bool use_cxa_atexit = flag_use_cxa_atexit
6290 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6292 push_to_top_level ();
6294 /* No need to mangle this. */
6295 push_lang_context (lang_name_c);
6297 /* Build the name of the function. */
6298 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6299 /* Build the function declaration. */
6300 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6301 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6302 /* It's a function with internal linkage, generated by the
6304 TREE_PUBLIC (fndecl) = 0;
6305 DECL_ARTIFICIAL (fndecl) = 1;
6306 /* Make the function `inline' so that it is only emitted if it is
6307 actually needed. It is unlikely that it will be inlined, since
6308 it is only called via a function pointer, but we avoid unnecessary
6309 emissions this way. */
6310 DECL_DECLARED_INLINE_P (fndecl) = 1;
6311 DECL_INTERFACE_KNOWN (fndecl) = 1;
6312 /* Build the parameter. */
6317 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6318 DECL_CONTEXT (parmdecl) = fndecl;
6319 TREE_USED (parmdecl) = 1;
6320 DECL_READ_P (parmdecl) = 1;
6321 DECL_ARGUMENTS (fndecl) = parmdecl;
6325 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6327 pop_lang_context ();
6329 return current_function_decl;
6332 /* Finish the cleanup function begun by start_cleanup_fn. */
6335 end_cleanup_fn (void)
6337 expand_or_defer_fn (finish_function (0));
6339 pop_from_top_level ();
6342 /* Generate code to handle the destruction of DECL, an object with
6343 static storage duration. */
6346 register_dtor_fn (tree decl)
6353 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6355 type = TREE_TYPE (decl);
6356 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6357 return void_zero_node;
6359 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6360 a class object, we can just pass the destructor to
6361 "__cxa_atexit"; we don't have to build a temporary function to do
6363 use_dtor = (flag_use_cxa_atexit
6364 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6365 && CLASS_TYPE_P (type));
6370 /* Find the destructor. */
6371 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6372 gcc_assert (idx >= 0);
6373 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6374 /* Make sure it is accessible. */
6375 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6379 /* Call build_cleanup before we enter the anonymous function so
6380 that any access checks will be done relative to the current
6381 scope, rather than the scope of the anonymous function. */
6382 build_cleanup (decl);
6384 /* Now start the function. */
6385 cleanup = start_cleanup_fn ();
6387 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6388 to the original function, rather than the anonymous one. That
6389 will make the back end think that nested functions are in use,
6390 which causes confusion. */
6391 push_deferring_access_checks (dk_no_check);
6392 fcall = build_cleanup (decl);
6393 pop_deferring_access_checks ();
6395 /* Create the body of the anonymous function. */
6396 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6397 finish_expr_stmt (fcall);
6398 finish_compound_stmt (compound_stmt);
6402 /* Call atexit with the cleanup function. */
6403 mark_used (cleanup);
6404 cleanup = build_address (cleanup);
6405 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6411 /* We must convert CLEANUP to the type that "__cxa_atexit"
6413 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6414 /* "__cxa_atexit" will pass the address of DECL to the
6415 cleanup function. */
6417 addr = build_address (decl);
6418 /* The declared type of the parameter to "__cxa_atexit" is
6419 "void *". For plain "T*", we could just let the
6420 machinery in cp_build_function_call convert it -- but if the
6421 type is "cv-qualified T *", then we need to convert it
6422 before passing it in, to avoid spurious errors. */
6423 addr = build_nop (ptr_type_node, addr);
6426 /* Since the cleanup functions we build ignore the address
6427 they're given, there's no reason to pass the actual address
6428 in, and, in general, it's cheaper to pass NULL than any
6430 addr = null_pointer_node;
6431 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6432 tf_warning_or_error);
6433 if (targetm.cxx.use_aeabi_atexit ())
6446 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6447 arg0, arg1, arg2, NULL_TREE);
6450 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6451 is its initializer. Generate code to handle the construction
6452 and destruction of DECL. */
6455 expand_static_init (tree decl, tree init)
6457 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6458 gcc_assert (TREE_STATIC (decl));
6460 /* Some variables require no dynamic initialization. */
6462 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6465 if (DECL_FUNCTION_SCOPE_P (decl))
6467 /* Emit code to perform this initialization but once. */
6468 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6469 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6470 tree guard, guard_addr;
6471 tree acquire_fn, release_fn, abort_fn;
6474 /* Emit code to perform this initialization but once. This code
6477 static <type> guard;
6478 if (!guard.first_byte) {
6479 if (__cxa_guard_acquire (&guard)) {
6482 // Do initialization.
6483 flag = true; __cxa_guard_release (&guard);
6484 // Register variable for destruction at end of program.
6486 if (!flag) __cxa_guard_abort (&guard);
6490 Note that the `flag' variable is only set to 1 *after* the
6491 initialization is complete. This ensures that an exception,
6492 thrown during the construction, will cause the variable to
6493 reinitialized when we pass through this code again, as per:
6497 If the initialization exits by throwing an exception, the
6498 initialization is not complete, so it will be tried again
6499 the next time control enters the declaration.
6501 This process should be thread-safe, too; multiple threads
6502 should not be able to initialize the variable more than
6505 /* Create the guard variable. */
6506 guard = get_guard (decl);
6508 /* This optimization isn't safe on targets with relaxed memory
6509 consistency. On such targets we force synchronization in
6510 __cxa_guard_acquire. */
6511 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6513 /* Begin the conditional initialization. */
6514 if_stmt = begin_if_stmt ();
6515 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6516 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6519 if (flag_threadsafe_statics)
6521 guard_addr = build_address (guard);
6523 acquire_fn = get_identifier ("__cxa_guard_acquire");
6524 release_fn = get_identifier ("__cxa_guard_release");
6525 abort_fn = get_identifier ("__cxa_guard_abort");
6526 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6528 tree vfntype = build_function_type_list (void_type_node,
6529 TREE_TYPE (guard_addr),
6531 acquire_fn = push_library_fn
6532 (acquire_fn, build_function_type_list (integer_type_node,
6533 TREE_TYPE (guard_addr),
6536 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6537 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6541 release_fn = identifier_global_value (release_fn);
6542 abort_fn = identifier_global_value (abort_fn);
6545 inner_if_stmt = begin_if_stmt ();
6546 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6549 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6550 begin = get_target_expr (boolean_false_node);
6551 flag = TARGET_EXPR_SLOT (begin);
6553 TARGET_EXPR_CLEANUP (begin)
6554 = build3 (COND_EXPR, void_type_node, flag,
6556 build_call_n (abort_fn, 1, guard_addr));
6557 CLEANUP_EH_ONLY (begin) = 1;
6559 /* Do the initialization itself. */
6560 init = add_stmt_to_compound (begin, init);
6561 init = add_stmt_to_compound
6562 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6563 init = add_stmt_to_compound
6564 (init, build_call_n (release_fn, 1, guard_addr));
6567 init = add_stmt_to_compound (init, set_guard (guard));
6569 /* Use atexit to register a function for destroying this static
6571 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6573 finish_expr_stmt (init);
6575 if (flag_threadsafe_statics)
6577 finish_compound_stmt (inner_then_clause);
6578 finish_then_clause (inner_if_stmt);
6579 finish_if_stmt (inner_if_stmt);
6582 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6584 finish_compound_stmt (then_clause);
6585 finish_then_clause (if_stmt);
6586 finish_if_stmt (if_stmt);
6590 static_aggregates = tree_cons (init, decl, static_aggregates);
6594 /* Make TYPE a complete type based on INITIAL_VALUE.
6595 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6596 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6597 3 if the initializer list is empty (in pedantic mode). */
6600 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6603 tree type, elt_type;
6607 unsigned HOST_WIDE_INT i;
6610 /* An array of character type can be initialized from a
6611 brace-enclosed string constant.
6613 FIXME: this code is duplicated from reshape_init. Probably
6614 we should just call reshape_init here? */
6615 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6616 && TREE_CODE (initial_value) == CONSTRUCTOR
6617 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6619 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6620 tree value = VEC_index (constructor_elt, v, 0)->value;
6622 if (TREE_CODE (value) == STRING_CST
6623 && VEC_length (constructor_elt, v) == 1)
6624 initial_value = value;
6627 /* If any of the elements are parameter packs, we can't actually
6628 complete this type now because the array size is dependent. */
6629 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6631 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6634 if (PACK_EXPANSION_P (value))
6640 failure = complete_array_type (ptype, initial_value, do_default);
6642 /* We can create the array before the element type is complete, which
6643 means that we didn't have these two bits set in the original type
6644 either. In completing the type, we are expected to propagate these
6645 bits. See also complete_type which does the same thing for arrays
6648 if (TYPE_DOMAIN (type))
6650 elt_type = TREE_TYPE (type);
6651 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6652 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6653 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6659 /* Return zero if something is declared to be a member of type
6660 CTYPE when in the context of CUR_TYPE. STRING is the error
6661 message to print in that case. Otherwise, quietly return 1. */
6664 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6666 if (ctype && ctype != cur_type)
6668 if (flags == DTOR_FLAG)
6669 error ("destructor for alien class %qT cannot be a member", ctype);
6671 error ("constructor for alien class %qT cannot be a member", ctype);
6677 /* Subroutine of `grokdeclarator'. */
6679 /* Generate errors possibly applicable for a given set of specifiers.
6680 This is for ARM $7.1.2. */
6683 bad_specifiers (tree object,
6684 enum bad_spec_place type,
6695 error ("%qD declared as a %<virtual%> variable", object);
6697 error ("%qD declared as an %<inline%> variable", object);
6699 error ("%<const%> and %<volatile%> function specifiers on "
6700 "%qD invalid in variable declaration", object);
6704 error ("%qD declared as a %<virtual%> parameter", object);
6706 error ("%qD declared as an %<inline%> parameter", object);
6708 error ("%<const%> and %<volatile%> function specifiers on "
6709 "%qD invalid in parameter declaration", object);
6713 error ("%qD declared as a %<virtual%> type", object);
6715 error ("%qD declared as an %<inline%> type", object);
6717 error ("%<const%> and %<volatile%> function specifiers on "
6718 "%qD invalid in type declaration", object);
6722 error ("%qD declared as a %<virtual%> field", object);
6724 error ("%qD declared as an %<inline%> field", object);
6726 error ("%<const%> and %<volatile%> function specifiers on "
6727 "%qD invalid in field declaration", object);
6733 error ("%q+D declared as a friend", object);
6735 && (TREE_CODE (object) == TYPE_DECL
6736 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6737 && !TYPE_REFFN_P (TREE_TYPE (object))
6738 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6739 error ("%q+D declared with an exception specification", object);
6742 /* DECL is a member function or static data member and is presently
6743 being defined. Check that the definition is taking place in a
6747 check_class_member_definition_namespace (tree decl)
6749 /* These checks only apply to member functions and static data
6751 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6752 || TREE_CODE (decl) == VAR_DECL);
6753 /* We check for problems with specializations in pt.c in
6754 check_specialization_namespace, where we can issue better
6756 if (processing_specialization)
6758 /* There are no restrictions on the placement of
6759 explicit instantiations. */
6760 if (processing_explicit_instantiation)
6764 A member function definition that appears outside of the
6765 class definition shall appear in a namespace scope enclosing
6766 the class definition.
6770 The definition for a static data member shall appear in a
6771 namespace scope enclosing the member's class definition. */
6772 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6773 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6774 decl, DECL_CONTEXT (decl));
6777 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6778 METHOD_TYPE for a non-static member function; QUALS are the
6779 cv-qualifiers that apply to the function. */
6782 build_this_parm (tree type, cp_cv_quals quals)
6787 cp_cv_quals this_quals;
6789 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6790 /* The `this' parameter is implicitly `const'; it cannot be
6792 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6793 qual_type = cp_build_qualified_type (this_type, this_quals);
6794 parm = build_artificial_parm (this_identifier, qual_type);
6795 cp_apply_type_quals_to_decl (this_quals, parm);
6799 /* CTYPE is class type, or null if non-class.
6800 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6802 DECLARATOR is the function's name.
6803 PARMS is a chain of PARM_DECLs for the function.
6804 VIRTUALP is truthvalue of whether the function is virtual or not.
6805 FLAGS are to be passed through to `grokclassfn'.
6806 QUALS are qualifiers indicating whether the function is `const'
6808 RAISES is a list of exceptions that this function can raise.
6809 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6810 not look, and -1 if we should not call `grokclassfn' at all.
6812 SFK is the kind of special function (if any) for the new function.
6814 Returns `NULL_TREE' if something goes wrong, after issuing
6815 applicable error messages. */
6818 grokfndecl (tree ctype,
6822 tree orig_declarator,
6824 enum overload_flags flags,
6831 special_function_kind sfk,
6836 location_t location)
6839 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6843 type = build_exception_variant (type, raises);
6845 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6847 /* If we have an explicit location, use it, otherwise use whatever
6848 build_lang_decl used (probably input_location). */
6849 if (location != UNKNOWN_LOCATION)
6850 DECL_SOURCE_LOCATION (decl) = location;
6852 if (TREE_CODE (type) == METHOD_TYPE)
6855 parm = build_this_parm (type, quals);
6856 DECL_CHAIN (parm) = parms;
6859 DECL_ARGUMENTS (decl) = parms;
6860 for (t = parms; t; t = DECL_CHAIN (t))
6861 DECL_CONTEXT (t) = decl;
6862 /* Propagate volatile out from type to decl. */
6863 if (TYPE_VOLATILE (type))
6864 TREE_THIS_VOLATILE (decl) = 1;
6866 /* Setup decl according to sfk. */
6869 case sfk_constructor:
6870 case sfk_copy_constructor:
6871 case sfk_move_constructor:
6872 DECL_CONSTRUCTOR_P (decl) = 1;
6874 case sfk_destructor:
6875 DECL_DESTRUCTOR_P (decl) = 1;
6881 /* If pointers to member functions use the least significant bit to
6882 indicate whether a function is virtual, ensure a pointer
6883 to this function will have that bit clear. */
6884 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6885 && TREE_CODE (type) == METHOD_TYPE
6886 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6887 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6890 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6894 ("defining explicit specialization %qD in friend declaration",
6898 tree fns = TREE_OPERAND (orig_declarator, 0);
6899 tree args = TREE_OPERAND (orig_declarator, 1);
6901 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6903 /* Something like `template <class T> friend void f<T>()'. */
6904 error ("invalid use of template-id %qD in declaration "
6905 "of primary template",
6911 /* A friend declaration of the form friend void f<>(). Record
6912 the information in the TEMPLATE_ID_EXPR. */
6913 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6915 if (TREE_CODE (fns) == COMPONENT_REF)
6917 /* Due to bison parser ickiness, we will have already looked
6918 up an operator_name or PFUNCNAME within the current class
6919 (see template_id in parse.y). If the current class contains
6920 such a name, we'll get a COMPONENT_REF here. Undo that. */
6922 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6923 == current_class_type);
6924 fns = TREE_OPERAND (fns, 1);
6926 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6927 || TREE_CODE (fns) == OVERLOAD);
6928 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6930 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6931 if (TREE_PURPOSE (t)
6932 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6934 error ("default arguments are not allowed in declaration "
6935 "of friend template specialization %qD",
6942 error ("%<inline%> is not allowed in declaration of friend "
6943 "template specialization %qD",
6950 /* If this decl has namespace scope, set that up. */
6952 set_decl_namespace (decl, in_namespace, friendp);
6954 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6956 /* `main' and builtins have implicit 'C' linkage. */
6957 if ((MAIN_NAME_P (declarator)
6958 || (IDENTIFIER_LENGTH (declarator) > 10
6959 && IDENTIFIER_POINTER (declarator)[0] == '_'
6960 && IDENTIFIER_POINTER (declarator)[1] == '_'
6961 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6962 && current_lang_name == lang_name_cplusplus
6963 && ctype == NULL_TREE
6964 && DECL_FILE_SCOPE_P (decl))
6965 SET_DECL_LANGUAGE (decl, lang_c);
6967 /* Should probably propagate const out from type to decl I bet (mrs). */
6970 DECL_STATIC_FUNCTION_P (decl) = 1;
6971 DECL_CONTEXT (decl) = ctype;
6976 DECL_CONTEXT (decl) = ctype;
6978 check_class_member_definition_namespace (decl);
6981 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6983 if (processing_template_decl)
6984 error ("cannot declare %<::main%> to be a template");
6986 error ("cannot declare %<::main%> to be inline");
6988 error ("cannot declare %<::main%> to be static");
6993 /* Members of anonymous types and local classes have no linkage; make
6994 them internal. If a typedef is made later, this will be changed. */
6995 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6996 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6999 if (publicp && cxx_dialect == cxx98)
7001 /* [basic.link]: A name with no linkage (notably, the name of a class
7002 or enumeration declared in a local scope) shall not be used to
7003 declare an entity with linkage.
7005 DR 757 relaxes this restriction for C++0x. */
7006 t = no_linkage_check (TREE_TYPE (decl),
7007 /*relaxed_p=*/false);
7010 if (TYPE_ANONYMOUS_P (t))
7012 if (DECL_EXTERN_C_P (decl))
7013 /* Allow this; it's pretty common in C. */;
7016 permerror (input_location, "anonymous type with no linkage "
7017 "used to declare function %q#D with linkage",
7019 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7020 permerror (input_location, "%q+#D does not refer to the unqualified "
7021 "type, so it is not used for linkage",
7026 permerror (input_location, "type %qT with no linkage used to "
7027 "declare function %q#D with linkage", t, decl);
7031 TREE_PUBLIC (decl) = publicp;
7034 DECL_INTERFACE_KNOWN (decl) = 1;
7035 DECL_NOT_REALLY_EXTERN (decl) = 1;
7038 /* If the declaration was declared inline, mark it as such. */
7040 DECL_DECLARED_INLINE_P (decl) = 1;
7042 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7044 DECL_EXTERNAL (decl) = 1;
7045 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7048 ? G_("static member function %qD cannot have cv-qualifier")
7049 : G_("non-member function %qD cannot have cv-qualifier"),
7051 quals = TYPE_UNQUALIFIED;
7054 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7055 && !grok_op_properties (decl, /*complain=*/true))
7059 /* Make the init_value nonzero so pushdecl knows this is not
7060 tentative. error_mark_node is replaced later with the BLOCK. */
7061 DECL_INITIAL (decl) = error_mark_node;
7063 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7064 TREE_NOTHROW (decl) = 1;
7066 /* Caller will do the rest of this. */
7070 if (ctype != NULL_TREE)
7071 grokclassfn (ctype, decl, flags);
7073 decl = check_explicit_specialization (orig_declarator, decl,
7076 4 * (friendp != 0));
7077 if (decl == error_mark_node)
7082 cplus_decl_attributes (&decl, *attrlist, 0);
7083 *attrlist = NULL_TREE;
7086 /* Check main's type after attributes have been applied. */
7087 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7089 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7092 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7094 error ("%<::main%> must return %<int%>");
7095 newtype = build_function_type (integer_type_node, oldtypeargs);
7096 TREE_TYPE (decl) = newtype;
7099 check_main_parameter_types (decl);
7102 if (ctype != NULL_TREE
7103 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7106 tree old_decl = check_classfn (ctype, decl,
7107 (processing_template_decl
7108 > template_class_depth (ctype))
7109 ? current_template_parms
7112 if (old_decl == error_mark_node)
7120 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7121 /* Because grokfndecl is always supposed to return a
7122 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7123 here. We depend on our callers to figure out that its
7124 really a template that's being returned. */
7125 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7127 if (DECL_STATIC_FUNCTION_P (old_decl)
7128 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7129 /* Remove the `this' parm added by grokclassfn.
7130 XXX Isn't this done in start_function, too? */
7131 revert_static_member_fn (decl);
7132 if (DECL_ARTIFICIAL (old_decl))
7134 error ("definition of implicitly-declared %qD", old_decl);
7138 /* Since we've smashed OLD_DECL to its
7139 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7140 if (TREE_CODE (decl) == TEMPLATE_DECL)
7141 decl = DECL_TEMPLATE_RESULT (decl);
7143 /* Attempt to merge the declarations. This can fail, in
7144 the case of some invalid specialization declarations. */
7145 pushed_scope = push_scope (ctype);
7146 ok = duplicate_decls (decl, old_decl, friendp);
7148 pop_scope (pushed_scope);
7151 error ("no %q#D member function declared in class %qT",
7159 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7162 if (ctype == NULL_TREE || check)
7166 DECL_VIRTUAL_P (decl) = 1;
7171 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7172 the linkage that DECL will receive in the object file. */
7175 set_linkage_for_static_data_member (tree decl)
7177 /* A static data member always has static storage duration and
7178 external linkage. Note that static data members are forbidden in
7179 local classes -- the only situation in which a class has
7180 non-external linkage. */
7181 TREE_PUBLIC (decl) = 1;
7182 TREE_STATIC (decl) = 1;
7183 /* For non-template classes, static data members are always put
7184 out in exactly those files where they are defined, just as
7185 with ordinary namespace-scope variables. */
7186 if (!processing_template_decl)
7187 DECL_INTERFACE_KNOWN (decl) = 1;
7190 /* Create a VAR_DECL named NAME with the indicated TYPE.
7192 If SCOPE is non-NULL, it is the class type or namespace containing
7193 the variable. If SCOPE is NULL, the variable should is created in
7194 the innermost enclosings scope. */
7197 grokvardecl (tree type,
7199 const cp_decl_specifier_seq *declspecs,
7205 tree explicit_scope;
7207 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7209 /* Compute the scope in which to place the variable, but remember
7210 whether or not that scope was explicitly specified by the user. */
7211 explicit_scope = scope;
7214 /* An explicit "extern" specifier indicates a namespace-scope
7216 if (declspecs->storage_class == sc_extern)
7217 scope = current_decl_namespace ();
7218 else if (!at_function_scope_p ())
7219 scope = current_scope ();
7223 && (/* If the variable is a namespace-scope variable declared in a
7224 template, we need DECL_LANG_SPECIFIC. */
7225 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7226 /* Similarly for namespace-scope variables with language linkage
7228 || (TREE_CODE (scope) == NAMESPACE_DECL
7229 && current_lang_name != lang_name_cplusplus)
7230 /* Similarly for static data members. */
7232 decl = build_lang_decl (VAR_DECL, name, type);
7234 decl = build_decl (input_location, VAR_DECL, name, type);
7236 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7237 set_decl_namespace (decl, explicit_scope, 0);
7239 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7241 if (declspecs->storage_class == sc_extern)
7243 DECL_THIS_EXTERN (decl) = 1;
7244 DECL_EXTERNAL (decl) = !initialized;
7247 if (DECL_CLASS_SCOPE_P (decl))
7249 set_linkage_for_static_data_member (decl);
7250 /* This function is only called with out-of-class definitions. */
7251 DECL_EXTERNAL (decl) = 0;
7252 check_class_member_definition_namespace (decl);
7254 /* At top level, either `static' or no s.c. makes a definition
7255 (perhaps tentative), and absence of `static' makes it public. */
7256 else if (toplevel_bindings_p ())
7258 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7259 && (DECL_THIS_EXTERN (decl) || ! constp));
7260 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7262 /* Not at top level, only `static' makes a static definition. */
7265 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7266 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7269 if (declspecs->specs[(int)ds_thread])
7270 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7272 /* If the type of the decl has no linkage, make sure that we'll
7273 notice that in mark_used. */
7274 if (cxx_dialect > cxx98
7275 && decl_linkage (decl) != lk_none
7276 && DECL_LANG_SPECIFIC (decl) == NULL
7277 && !DECL_EXTERN_C_P (decl)
7278 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7279 retrofit_lang_decl (decl);
7281 if (TREE_PUBLIC (decl))
7283 /* [basic.link]: A name with no linkage (notably, the name of a class
7284 or enumeration declared in a local scope) shall not be used to
7285 declare an entity with linkage.
7287 DR 757 relaxes this restriction for C++0x. */
7288 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7289 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7292 if (TYPE_ANONYMOUS_P (t))
7294 if (DECL_EXTERN_C_P (decl))
7295 /* Allow this; it's pretty common in C. */
7299 /* DRs 132, 319 and 389 seem to indicate types with
7300 no linkage can only be used to declare extern "C"
7301 entities. Since it's not always an error in the
7302 ISO C++ 90 Standard, we only issue a warning. */
7303 warning (0, "anonymous type with no linkage used to declare "
7304 "variable %q#D with linkage", decl);
7305 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7306 warning (0, "%q+#D does not refer to the unqualified "
7307 "type, so it is not used for linkage",
7312 warning (0, "type %qT with no linkage used to declare variable "
7313 "%q#D with linkage", t, decl);
7317 DECL_INTERFACE_KNOWN (decl) = 1;
7322 /* Create and return a canonical pointer to member function type, for
7323 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7326 build_ptrmemfunc_type (tree type)
7330 tree unqualified_variant = NULL_TREE;
7332 if (type == error_mark_node)
7335 /* If a canonical type already exists for this type, use it. We use
7336 this method instead of type_hash_canon, because it only does a
7337 simple equality check on the list of field members. */
7339 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7342 /* Make sure that we always have the unqualified pointer-to-member
7344 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7346 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7348 t = make_class_type (RECORD_TYPE);
7349 xref_basetypes (t, NULL_TREE);
7351 /* Let the front end know this is a pointer to member function... */
7352 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7353 /* ... and not really a class type. */
7354 SET_CLASS_TYPE_P (t, 0);
7356 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7359 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7361 DECL_CHAIN (field) = fields;
7364 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7366 /* Zap out the name so that the back end will give us the debugging
7367 information for this anonymous RECORD_TYPE. */
7368 TYPE_NAME (t) = NULL_TREE;
7370 /* If this is not the unqualified form of this pointer-to-member
7371 type, set the TYPE_MAIN_VARIANT for this type to be the
7372 unqualified type. Since they are actually RECORD_TYPEs that are
7373 not variants of each other, we must do this manually.
7374 As we just built a new type there is no need to do yet another copy. */
7375 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7377 int type_quals = cp_type_quals (type);
7378 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7379 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7380 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7381 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7382 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7383 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7384 TREE_TYPE (TYPE_BINFO (t)) = t;
7387 /* Cache this pointer-to-member type so that we can find it again
7389 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7391 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7392 SET_TYPE_STRUCTURAL_EQUALITY (t);
7393 else if (TYPE_CANONICAL (type) != type)
7394 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7399 /* Create and return a pointer to data member type. */
7402 build_ptrmem_type (tree class_type, tree member_type)
7404 if (TREE_CODE (member_type) == METHOD_TYPE)
7406 cp_cv_quals quals = type_memfn_quals (member_type);
7407 member_type = build_memfn_type (member_type, class_type, quals);
7408 return build_ptrmemfunc_type (build_pointer_type (member_type));
7412 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7413 return build_offset_type (class_type, member_type);
7417 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7418 Check to see that the definition is valid. Issue appropriate error
7419 messages. Return 1 if the definition is particularly bad, or 0
7423 check_static_variable_definition (tree decl, tree type)
7425 /* If DECL is declared constexpr, we'll do the appropriate checks
7426 in check_initializer. */
7427 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7429 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7431 if (literal_type_p (type))
7432 error ("%<constexpr%> needed for in-class initialization of static "
7433 "data member %q#D of non-integral type", decl);
7435 error ("in-class initialization of static data member %q#D of "
7436 "non-literal type", decl);
7440 /* Motion 10 at San Diego: If a static const integral data member is
7441 initialized with an integral constant expression, the initializer
7442 may appear either in the declaration (within the class), or in
7443 the definition, but not both. If it appears in the class, the
7444 member is a member constant. The file-scope definition is always
7446 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7448 error ("invalid in-class initialization of static data member "
7449 "of non-integral type %qT",
7453 else if (!CP_TYPE_CONST_P (type))
7454 error ("ISO C++ forbids in-class initialization of non-const "
7455 "static member %qD",
7457 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7458 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7459 "%qD of non-integral type %qT", decl, type);
7464 /* Given the SIZE (i.e., number of elements) in an array, compute an
7465 appropriate index type for the array. If non-NULL, NAME is the
7466 name of the thing being declared. */
7469 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7474 tree abi_1_itype = NULL_TREE;
7476 if (error_operand_p (size))
7477 return error_mark_node;
7479 type = TREE_TYPE (size);
7480 /* type_dependent_expression_p? */
7481 if (!dependent_type_p (type))
7483 mark_rvalue_use (size);
7485 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7486 && TREE_SIDE_EFFECTS (size))
7487 /* In C++98, we mark a non-constant array bound with a magic
7488 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7491 size = fold_non_dependent_expr (size);
7493 if (CLASS_TYPE_P (type)
7494 && CLASSTYPE_LITERAL_P (type))
7496 size = build_expr_type_conversion (WANT_INT, size, true);
7497 if (size == error_mark_node)
7498 return error_mark_node;
7499 type = TREE_TYPE (size);
7502 size = maybe_constant_value (size);
7505 if (error_operand_p (size))
7506 return error_mark_node;
7508 /* The array bound must be an integer type. */
7509 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7511 if (!(complain & tf_error))
7512 return error_mark_node;
7514 error ("size of array %qD has non-integral type %qT", name, type);
7516 error ("size of array has non-integral type %qT", type);
7517 size = integer_one_node;
7518 type = TREE_TYPE (size);
7522 /* A type is dependent if it is...an array type constructed from any
7523 dependent type or whose size is specified by a constant expression
7524 that is value-dependent. */
7525 /* We can only call value_dependent_expression_p on integral constant
7526 expressions; treat non-constant expressions as dependent, too. */
7527 if (processing_template_decl
7528 && (dependent_type_p (type)
7529 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7531 /* We cannot do any checking for a SIZE that isn't known to be
7532 constant. Just build the index type and mark that it requires
7533 structural equality checks. */
7534 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7535 size, integer_one_node));
7536 TYPE_DEPENDENT_P (itype) = 1;
7537 TYPE_DEPENDENT_P_VALID (itype) = 1;
7538 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7542 if (!abi_version_at_least (2) && processing_template_decl)
7543 /* For abi-1, we handled all instances in templates the same way,
7544 even when they were non-dependent. This affects the manglings
7545 produced. So, we do the normal checking for non-dependent
7546 sizes, but at the end we'll return the same type that abi-1
7547 would have, but with TYPE_CANONICAL set to the "right"
7548 value that the current ABI would provide. */
7549 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7550 osize, integer_one_node));
7552 /* Normally, the array-bound will be a constant. */
7553 if (TREE_CODE (size) == INTEGER_CST)
7555 /* Check to see if the array bound overflowed. Make that an
7556 error, no matter how generous we're being. */
7557 constant_expression_error (size);
7559 /* An array must have a positive number of elements. */
7560 if (INT_CST_LT (size, integer_zero_node))
7562 if (!(complain & tf_error))
7563 return error_mark_node;
7565 error ("size of array %qD is negative", name);
7567 error ("size of array is negative");
7568 size = integer_one_node;
7570 /* As an extension we allow zero-sized arrays. */
7571 else if (integer_zerop (size))
7573 if (!(complain & tf_error))
7574 /* We must fail if performing argument deduction (as
7575 indicated by the state of complain), so that
7576 another substitution can be found. */
7577 return error_mark_node;
7578 else if (in_system_header)
7579 /* Allow them in system headers because glibc uses them. */;
7581 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7583 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7586 else if (TREE_CONSTANT (size)
7587 /* We don't allow VLAs at non-function scopes, or during
7588 tentative template substitution. */
7589 || !at_function_scope_p () || !(complain & tf_error))
7591 if (!(complain & tf_error))
7592 return error_mark_node;
7593 /* `(int) &fn' is not a valid array bound. */
7595 error ("size of array %qD is not an integral constant-expression",
7598 error ("size of array is not an integral constant-expression");
7599 size = integer_one_node;
7601 else if (pedantic && warn_vla != 0)
7604 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7606 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7608 else if (warn_vla > 0)
7612 "variable length array %qD is used", name);
7615 "variable length array is used");
7618 if (processing_template_decl && !TREE_CONSTANT (size))
7619 /* A variable sized array. */
7620 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7623 HOST_WIDE_INT saved_processing_template_decl;
7625 /* Compute the index of the largest element in the array. It is
7626 one less than the number of elements in the array. We save
7627 and restore PROCESSING_TEMPLATE_DECL so that computations in
7628 cp_build_binary_op will be appropriately folded. */
7629 saved_processing_template_decl = processing_template_decl;
7630 processing_template_decl = 0;
7631 itype = cp_build_binary_op (input_location,
7633 cp_convert (ssizetype, size),
7634 cp_convert (ssizetype, integer_one_node),
7635 tf_warning_or_error);
7636 itype = fold (itype);
7637 processing_template_decl = saved_processing_template_decl;
7639 if (!TREE_CONSTANT (itype))
7640 /* A variable sized array. */
7641 itype = variable_size (itype);
7642 /* Make sure that there was no overflow when creating to a signed
7643 index type. (For example, on a 32-bit machine, an array with
7644 size 2^32 - 1 is too big.) */
7645 else if (TREE_CODE (itype) == INTEGER_CST
7646 && TREE_OVERFLOW (itype))
7648 if (!(complain & tf_error))
7649 return error_mark_node;
7650 error ("overflow in array dimension");
7651 TREE_OVERFLOW (itype) = 0;
7655 /* Create and return the appropriate index type. */
7658 tree t = build_index_type (itype);
7659 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7660 itype = abi_1_itype;
7663 itype = build_index_type (itype);
7665 /* If the index type were dependent, we would have returned early, so
7666 remember that it isn't. */
7667 TYPE_DEPENDENT_P (itype) = 0;
7668 TYPE_DEPENDENT_P_VALID (itype) = 1;
7672 /* Returns the scope (if any) in which the entity declared by
7673 DECLARATOR will be located. If the entity was declared with an
7674 unqualified name, NULL_TREE is returned. */
7677 get_scope_of_declarator (const cp_declarator *declarator)
7679 while (declarator && declarator->kind != cdk_id)
7680 declarator = declarator->declarator;
7682 /* If the declarator-id is a SCOPE_REF, the scope in which the
7683 declaration occurs is the first operand. */
7685 && declarator->u.id.qualifying_scope)
7686 return declarator->u.id.qualifying_scope;
7688 /* Otherwise, the declarator is not a qualified name; the entity will
7689 be declared in the current scope. */
7693 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7694 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7698 create_array_type_for_decl (tree name, tree type, tree size)
7700 tree itype = NULL_TREE;
7702 /* If things have already gone awry, bail now. */
7703 if (type == error_mark_node || size == error_mark_node)
7704 return error_mark_node;
7706 /* If there are some types which cannot be array elements,
7707 issue an error-message and return. */
7708 switch (TREE_CODE (type))
7712 error ("declaration of %qD as array of void", name);
7714 error ("creating array of void");
7715 return error_mark_node;
7719 error ("declaration of %qD as array of functions", name);
7721 error ("creating array of functions");
7722 return error_mark_node;
7724 case REFERENCE_TYPE:
7726 error ("declaration of %qD as array of references", name);
7728 error ("creating array of references");
7729 return error_mark_node;
7733 error ("declaration of %qD as array of function members", name);
7735 error ("creating array of function members");
7736 return error_mark_node;
7744 The constant expressions that specify the bounds of the arrays
7745 can be omitted only for the first member of the sequence. */
7746 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7749 error ("declaration of %qD as multidimensional array must "
7750 "have bounds for all dimensions except the first",
7753 error ("multidimensional array must have bounds for all "
7754 "dimensions except the first");
7756 return error_mark_node;
7759 /* Figure out the index type for the array. */
7761 itype = compute_array_index_type (name, size, tf_warning_or_error);
7764 T is called the array element type; this type shall not be [...] an
7765 abstract class type. */
7766 abstract_virtuals_error (name, type);
7768 return build_cplus_array_type (type, itype);
7771 /* Check that it's OK to declare a function with the indicated TYPE.
7772 SFK indicates the kind of special function (if any) that this
7773 function is. OPTYPE is the type given in a conversion operator
7774 declaration, or the class type for a constructor/destructor.
7775 Returns the actual return type of the function; that
7776 may be different than TYPE if an error occurs, or for certain
7777 special functions. */
7780 check_special_function_return_type (special_function_kind sfk,
7786 case sfk_constructor:
7788 error ("return type specification for constructor invalid");
7790 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7791 type = build_pointer_type (optype);
7793 type = void_type_node;
7796 case sfk_destructor:
7798 error ("return type specification for destructor invalid");
7799 /* We can't use the proper return type here because we run into
7800 problems with ambiguous bases and covariant returns.
7801 Java classes are left unchanged because (void *) isn't a valid
7802 Java type, and we don't want to change the Java ABI. */
7803 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7804 type = build_pointer_type (void_type_node);
7806 type = void_type_node;
7809 case sfk_conversion:
7811 error ("return type specified for %<operator %T%>", optype);
7822 /* A variable or data member (whose unqualified name is IDENTIFIER)
7823 has been declared with the indicated TYPE. If the TYPE is not
7824 acceptable, issue an error message and return a type to use for
7825 error-recovery purposes. */
7828 check_var_type (tree identifier, tree type)
7830 if (VOID_TYPE_P (type))
7833 error ("unnamed variable or field declared void");
7834 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7836 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7837 error ("variable or field %qE declared void", identifier);
7840 error ("variable or field declared void");
7841 type = error_mark_node;
7847 /* Given declspecs and a declarator (abstract or otherwise), determine
7848 the name and type of the object declared and construct a DECL node
7851 DECLSPECS points to the representation of declaration-specifier
7852 sequence that precedes declarator.
7854 DECL_CONTEXT says which syntactic context this declaration is in:
7855 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7856 FUNCDEF for a function definition. Like NORMAL but a few different
7857 error messages in each case. Return value may be zero meaning
7858 this definition is too screwy to try to parse.
7859 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7860 handle member functions (which have FIELD context).
7861 Return value may be zero meaning this definition is too screwy to
7863 PARM for a parameter declaration (either within a function prototype
7864 or before a function body). Make a PARM_DECL, or return void_type_node.
7865 TPARM for a template parameter declaration.
7866 CATCHPARM for a parameter declaration before a catch clause.
7867 TYPENAME if for a typename (in a cast or sizeof).
7868 Don't make a DECL node; just return the ..._TYPE node.
7869 FIELD for a struct or union field; make a FIELD_DECL.
7870 BITFIELD for a field with specified width.
7872 INITIALIZED is as for start_decl.
7874 ATTRLIST is a pointer to the list of attributes, which may be NULL
7875 if there are none; *ATTRLIST may be modified if attributes from inside
7876 the declarator should be applied to the declaration.
7878 When this function is called, scoping variables (such as
7879 CURRENT_CLASS_TYPE) should reflect the scope in which the
7880 declaration occurs, not the scope in which the new declaration will
7881 be placed. For example, on:
7885 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7888 Returns a DECL (if a declarator is present), a TYPE (if there is no
7889 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7893 grokdeclarator (const cp_declarator *declarator,
7894 const cp_decl_specifier_seq *declspecs,
7895 enum decl_context decl_context,
7899 tree type = NULL_TREE;
7901 int explicit_int128 = 0;
7902 int virtualp, explicitp, friendp, inlinep, staticp;
7903 int explicit_int = 0;
7904 int explicit_char = 0;
7905 int defaulted_int = 0;
7906 tree dependent_name = NULL_TREE;
7908 tree typedef_decl = NULL_TREE;
7909 const char *name = NULL;
7910 tree typedef_type = NULL_TREE;
7911 /* True if this declarator is a function definition. */
7912 bool funcdef_flag = false;
7913 cp_declarator_kind innermost_code = cdk_error;
7916 /* See the code below that used this. */
7917 tree decl_attr = NULL_TREE;
7920 /* Keep track of what sort of function is being processed
7921 so that we can warn about default return values, or explicit
7922 return values which do not match prescribed defaults. */
7923 special_function_kind sfk = sfk_none;
7925 tree dname = NULL_TREE;
7926 tree ctor_return_type = NULL_TREE;
7927 enum overload_flags flags = NO_SPECIAL;
7928 /* cv-qualifiers that apply to the declarator, for a declaration of
7929 a member function. */
7930 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7931 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7933 tree raises = NULL_TREE;
7934 int template_count = 0;
7935 tree returned_attrs = NULL_TREE;
7936 tree parms = NULL_TREE;
7937 const cp_declarator *id_declarator;
7938 /* The unqualified name of the declarator; either an
7939 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7940 tree unqualified_id;
7941 /* The class type, if any, in which this entity is located,
7942 or NULL_TREE if none. Note that this value may be different from
7943 the current class type; for example if an attempt is made to declare
7944 "A::f" inside "B", this value will be "A". */
7945 tree ctype = current_class_type;
7946 /* The NAMESPACE_DECL for the namespace in which this entity is
7947 located. If an unqualified name is used to declare the entity,
7948 this value will be NULL_TREE, even if the entity is located at
7950 tree in_namespace = NULL_TREE;
7951 cp_storage_class storage_class;
7952 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7953 bool type_was_error_mark_node = false;
7954 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7955 bool template_type_arg = false;
7956 bool template_parm_flag = false;
7957 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7960 signed_p = declspecs->specs[(int)ds_signed];
7961 unsigned_p = declspecs->specs[(int)ds_unsigned];
7962 short_p = declspecs->specs[(int)ds_short];
7963 long_p = declspecs->specs[(int)ds_long];
7964 longlong = declspecs->specs[(int)ds_long] >= 2;
7965 explicit_int128 = declspecs->explicit_int128_p;
7966 thread_p = declspecs->specs[(int)ds_thread];
7968 if (decl_context == FUNCDEF)
7969 funcdef_flag = true, decl_context = NORMAL;
7970 else if (decl_context == MEMFUNCDEF)
7971 funcdef_flag = true, decl_context = FIELD;
7972 else if (decl_context == BITFIELD)
7973 bitfield = 1, decl_context = FIELD;
7974 else if (decl_context == TEMPLATE_TYPE_ARG)
7975 template_type_arg = true, decl_context = TYPENAME;
7976 else if (decl_context == TPARM)
7977 template_parm_flag = true, decl_context = PARM;
7979 if (initialized > 1)
7980 funcdef_flag = true;
7982 /* Look inside a declarator for the name being declared
7983 and get it as a string, for an error message. */
7984 for (id_declarator = declarator;
7986 id_declarator = id_declarator->declarator)
7988 if (id_declarator->kind != cdk_id)
7989 innermost_code = id_declarator->kind;
7991 switch (id_declarator->kind)
7994 if (id_declarator->declarator
7995 && id_declarator->declarator->kind == cdk_id)
7997 sfk = id_declarator->declarator->u.id.sfk;
7998 if (sfk == sfk_destructor)
8005 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8006 tree decl = id_declarator->u.id.unqualified_name;
8009 if (qualifying_scope)
8011 if (at_function_scope_p ())
8015 A declarator-id shall not be qualified except
8018 None of the cases are permitted in block
8020 if (qualifying_scope == global_namespace)
8021 error ("invalid use of qualified-name %<::%D%>",
8023 else if (TYPE_P (qualifying_scope))
8024 error ("invalid use of qualified-name %<%T::%D%>",
8025 qualifying_scope, decl);
8027 error ("invalid use of qualified-name %<%D::%D%>",
8028 qualifying_scope, decl);
8029 return error_mark_node;
8031 else if (TYPE_P (qualifying_scope))
8033 ctype = qualifying_scope;
8034 if (innermost_code != cdk_function
8035 && current_class_type
8036 && !UNIQUELY_DERIVED_FROM_P (ctype,
8037 current_class_type))
8039 error ("type %qT is not derived from type %qT",
8040 ctype, current_class_type);
8041 return error_mark_node;
8044 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8045 in_namespace = qualifying_scope;
8047 switch (TREE_CODE (decl))
8053 if (innermost_code != cdk_function)
8055 error ("declaration of %qD as non-function", decl);
8056 return error_mark_node;
8058 else if (!qualifying_scope
8059 && !(current_class_type && at_class_scope_p ()))
8061 error ("declaration of %qD as non-member", decl);
8062 return error_mark_node;
8065 type = TREE_OPERAND (decl, 0);
8067 type = constructor_name (type);
8068 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8073 case TEMPLATE_ID_EXPR:
8075 tree fns = TREE_OPERAND (decl, 0);
8078 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8080 gcc_assert (is_overloaded_fn (dname));
8081 dname = DECL_NAME (get_first_fn (dname));
8086 case IDENTIFIER_NODE:
8087 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8090 if (C_IS_RESERVED_WORD (dname))
8092 error ("declarator-id missing; using reserved word %qD",
8094 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8096 else if (!IDENTIFIER_TYPENAME_P (dname))
8097 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8100 gcc_assert (flags == NO_SPECIAL);
8101 flags = TYPENAME_FLAG;
8102 ctor_return_type = TREE_TYPE (dname);
8103 sfk = sfk_conversion;
8104 if (is_typename_at_global_scope (dname))
8105 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8107 name = "<invalid operator>";
8124 return error_mark_node;
8129 if (id_declarator->kind == cdk_id)
8135 The declarator in a function-definition shall have the form
8136 D1 ( parameter-declaration-clause) ... */
8137 if (funcdef_flag && innermost_code != cdk_function)
8139 error ("function definition does not declare parameters");
8140 return error_mark_node;
8143 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8144 && innermost_code != cdk_function
8145 && ! (ctype && !declspecs->any_specifiers_p))
8147 error ("declaration of %qD as non-function", dname);
8148 return error_mark_node;
8151 /* Anything declared one level down from the top level
8152 must be one of the parameters of a function
8153 (because the body is at least two levels down). */
8155 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8156 by not allowing C++ class definitions to specify their parameters
8157 with xdecls (must be spec.d in the parmlist).
8159 Since we now wait to push a class scope until we are sure that
8160 we are in a legitimate method context, we must set oldcname
8161 explicitly (since current_class_name is not yet alive).
8163 We also want to avoid calling this a PARM if it is in a namespace. */
8165 if (decl_context == NORMAL && !toplevel_bindings_p ())
8167 struct cp_binding_level *b = current_binding_level;
8168 current_binding_level = b->level_chain;
8169 if (current_binding_level != 0 && toplevel_bindings_p ())
8170 decl_context = PARM;
8171 current_binding_level = b;
8175 name = decl_context == PARM ? "parameter" : "type name";
8177 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8179 error ("%<constexpr%> cannot appear in a typedef declaration");
8180 return error_mark_node;
8183 /* If there were multiple types specified in the decl-specifier-seq,
8184 issue an error message. */
8185 if (declspecs->multiple_types_p)
8187 error ("two or more data types in declaration of %qs", name);
8188 return error_mark_node;
8191 if (declspecs->conflicting_specifiers_p)
8193 error ("conflicting specifiers in declaration of %qs", name);
8194 return error_mark_node;
8197 /* Extract the basic type from the decl-specifier-seq. */
8198 type = declspecs->type;
8199 if (type == error_mark_node)
8202 type_was_error_mark_node = true;
8204 /* If the entire declaration is itself tagged as deprecated then
8205 suppress reports of deprecated items. */
8206 if (type && TREE_DEPRECATED (type)
8207 && deprecated_state != DEPRECATED_SUPPRESS)
8208 warn_deprecated_use (type, NULL_TREE);
8209 if (type && TREE_CODE (type) == TYPE_DECL)
8211 typedef_decl = type;
8212 type = TREE_TYPE (typedef_decl);
8213 if (TREE_DEPRECATED (type)
8214 && DECL_ARTIFICIAL (typedef_decl)
8215 && deprecated_state != DEPRECATED_SUPPRESS)
8216 warn_deprecated_use (type, NULL_TREE);
8218 /* No type at all: default to `int', and set DEFAULTED_INT
8219 because it was not a user-defined typedef. */
8220 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8222 /* These imply 'int'. */
8223 type = integer_type_node;
8227 explicit_int = declspecs->explicit_int_p;
8228 explicit_char = declspecs->explicit_char_p;
8231 /* See the code below that used this. */
8233 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8235 typedef_type = type;
8238 if (sfk != sfk_conversion)
8239 ctor_return_type = ctype;
8241 if (sfk != sfk_none)
8242 type = check_special_function_return_type (sfk, type,
8244 else if (type == NULL_TREE)
8250 /* We handle `main' specially here, because 'main () { }' is so
8251 common. With no options, it is allowed. With -Wreturn-type,
8252 it is a warning. It is only an error with -pedantic-errors. */
8253 is_main = (funcdef_flag
8254 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8255 && MAIN_NAME_P (dname)
8256 && ctype == NULL_TREE
8257 && in_namespace == NULL_TREE
8258 && current_namespace == global_namespace);
8260 if (type_was_error_mark_node)
8261 /* We've already issued an error, don't complain more. */;
8262 else if (in_system_header || flag_ms_extensions)
8263 /* Allow it, sigh. */;
8265 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8267 pedwarn (input_location, OPT_pedantic,
8268 "ISO C++ forbids declaration of %qs with no type", name);
8270 warning (OPT_Wreturn_type,
8271 "ISO C++ forbids declaration of %qs with no type", name);
8273 type = integer_type_node;
8278 /* Now process the modifiers that were specified
8279 and check for invalid combinations. */
8281 /* Long double is a special combination. */
8282 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8285 type = cp_build_qualified_type (long_double_type_node,
8286 cp_type_quals (type));
8289 /* Check all other uses of type modifiers. */
8291 if (unsigned_p || signed_p || long_p || short_p)
8295 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8296 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8297 else if (signed_p && unsigned_p)
8298 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8299 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8300 error ("%<long long%> invalid for %qs", name);
8301 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8302 error ("%<__int128%> invalid for %qs", name);
8303 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8304 error ("%<long%> invalid for %qs", name);
8305 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8306 error ("%<short%> invalid for %qs", name);
8307 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8308 error ("%<long%> or %<short%> invalid for %qs", name);
8309 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8310 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8311 else if ((long_p || short_p) && explicit_char)
8312 error ("%<long%> or %<short%> specified with char for %qs", name);
8313 else if (long_p && short_p)
8314 error ("%<long%> and %<short%> specified together for %qs", name);
8315 else if (type == char16_type_node || type == char32_type_node)
8317 if (signed_p || unsigned_p)
8318 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8319 else if (short_p || long_p)
8320 error ("%<short%> or %<long%> invalid for %qs", name);
8325 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8327 pedwarn (input_location, OPT_pedantic,
8328 "long, short, signed or unsigned used invalidly for %qs",
8330 if (flag_pedantic_errors)
8333 if (explicit_int128)
8335 if (int128_integer_type_node == NULL_TREE)
8337 error ("%<__int128%> is not supported by this target");
8342 pedwarn (input_location, OPT_pedantic,
8343 "ISO C++ does not support %<__int128%> for %qs",
8345 if (flag_pedantic_errors)
8351 /* Discard the type modifiers if they are invalid. */
8359 explicit_int128 = false;
8363 /* Decide whether an integer type is signed or not.
8364 Optionally treat bitfields as signed by default. */
8368 It is implementation-defined whether a plain (neither
8369 explicitly signed or unsigned) char, short, int, or long
8370 bit-field is signed or unsigned.
8372 Naturally, we extend this to long long as well. Note that
8373 this does not include wchar_t. */
8374 || (bitfield && !flag_signed_bitfields
8376 /* A typedef for plain `int' without `signed' can be
8377 controlled just like plain `int', but a typedef for
8378 `signed int' cannot be so controlled. */
8380 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8381 && TREE_CODE (type) == INTEGER_TYPE
8382 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8384 if (explicit_int128)
8385 type = int128_unsigned_type_node;
8387 type = long_long_unsigned_type_node;
8389 type = long_unsigned_type_node;
8391 type = short_unsigned_type_node;
8392 else if (type == char_type_node)
8393 type = unsigned_char_type_node;
8394 else if (typedef_decl)
8395 type = unsigned_type_for (type);
8397 type = unsigned_type_node;
8399 else if (signed_p && type == char_type_node)
8400 type = signed_char_type_node;
8401 else if (explicit_int128)
8402 type = int128_integer_type_node;
8404 type = long_long_integer_type_node;
8406 type = long_integer_type_node;
8408 type = short_integer_type_node;
8410 if (declspecs->specs[(int)ds_complex])
8412 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8413 error ("complex invalid for %qs", name);
8414 /* If we just have "complex", it is equivalent to
8415 "complex double", but if any modifiers at all are specified it is
8416 the complex form of TYPE. E.g, "complex short" is
8417 "complex short int". */
8418 else if (defaulted_int && ! longlong && ! explicit_int128
8419 && ! (long_p || short_p || signed_p || unsigned_p))
8420 type = complex_double_type_node;
8421 else if (type == integer_type_node)
8422 type = complex_integer_type_node;
8423 else if (type == float_type_node)
8424 type = complex_float_type_node;
8425 else if (type == double_type_node)
8426 type = complex_double_type_node;
8427 else if (type == long_double_type_node)
8428 type = complex_long_double_type_node;
8430 type = build_complex_type (type);
8433 type_quals = TYPE_UNQUALIFIED;
8434 if (declspecs->specs[(int)ds_const])
8435 type_quals |= TYPE_QUAL_CONST;
8436 if (declspecs->specs[(int)ds_volatile])
8437 type_quals |= TYPE_QUAL_VOLATILE;
8438 if (declspecs->specs[(int)ds_restrict])
8439 type_quals |= TYPE_QUAL_RESTRICT;
8440 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8441 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8444 type_quals |= cp_type_quals (type);
8445 type = cp_build_qualified_type_real
8446 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8447 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8448 /* We might have ignored or rejected some of the qualifiers. */
8449 type_quals = cp_type_quals (type);
8452 inlinep = !! declspecs->specs[(int)ds_inline];
8453 virtualp = !! declspecs->specs[(int)ds_virtual];
8454 explicitp = !! declspecs->specs[(int)ds_explicit];
8456 storage_class = declspecs->storage_class;
8457 if (storage_class == sc_static)
8458 staticp = 1 + (decl_context == FIELD);
8460 if (virtualp && staticp == 2)
8462 error ("member %qD cannot be declared both virtual and static", dname);
8463 storage_class = sc_none;
8466 friendp = !! declspecs->specs[(int)ds_friend];
8468 if (dependent_name && !friendp)
8470 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8471 return error_mark_node;
8474 /* Issue errors about use of storage classes for parameters. */
8475 if (decl_context == PARM)
8477 if (declspecs->specs[(int)ds_typedef])
8479 error ("typedef declaration invalid in parameter declaration");
8480 return error_mark_node;
8482 else if (template_parm_flag && storage_class != sc_none)
8484 error ("storage class specified for template parameter %qs", name);
8485 return error_mark_node;
8487 else if (storage_class == sc_static
8488 || storage_class == sc_extern
8490 error ("storage class specifiers invalid in parameter declarations");
8492 if (type_uses_auto (type))
8494 error ("parameter declared %<auto%>");
8495 type = error_mark_node;
8498 /* Function parameters cannot be constexpr. If we saw one, moan
8499 and pretend it wasn't there. */
8502 error ("a parameter cannot be declared %<constexpr%>");
8507 /* Give error if `virtual' is used outside of class declaration. */
8509 && (current_class_name == NULL_TREE || decl_context != FIELD))
8511 error ("%<virtual%> outside class declaration");
8515 /* Static anonymous unions are dealt with here. */
8516 if (staticp && decl_context == TYPENAME
8518 && ANON_AGGR_TYPE_P (declspecs->type))
8519 decl_context = FIELD;
8521 /* Warn about storage classes that are invalid for certain
8522 kinds of declarations (parameters, typenames, etc.). */
8525 && storage_class != sc_extern
8526 && storage_class != sc_static)
8527 || declspecs->specs[(int)ds_typedef]))
8529 error ("multiple storage classes in declaration of %qs", name);
8532 if (decl_context != NORMAL
8533 && ((storage_class != sc_none
8534 && storage_class != sc_mutable)
8537 if ((decl_context == PARM || decl_context == CATCHPARM)
8538 && (storage_class == sc_register
8539 || storage_class == sc_auto))
8541 else if (declspecs->specs[(int)ds_typedef])
8543 else if (decl_context == FIELD
8544 /* C++ allows static class elements. */
8545 && storage_class == sc_static)
8546 /* C++ also allows inlines and signed and unsigned elements,
8547 but in those cases we don't come in here. */
8551 if (decl_context == FIELD)
8552 error ("storage class specified for %qs", name);
8555 if (decl_context == PARM || decl_context == CATCHPARM)
8556 error ("storage class specified for parameter %qs", name);
8558 error ("storage class specified for typename");
8560 if (storage_class == sc_register
8561 || storage_class == sc_auto
8562 || storage_class == sc_extern
8564 storage_class = sc_none;
8567 else if (storage_class == sc_extern && funcdef_flag
8568 && ! toplevel_bindings_p ())
8569 error ("nested function %qs declared %<extern%>", name);
8570 else if (toplevel_bindings_p ())
8572 if (storage_class == sc_auto)
8573 error ("top-level declaration of %qs specifies %<auto%>", name);
8576 && storage_class != sc_extern
8577 && storage_class != sc_static)
8579 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8584 if (storage_class && friendp)
8586 error ("storage class specifiers invalid in friend function declarations");
8587 storage_class = sc_none;
8592 unqualified_id = NULL_TREE;
8595 unqualified_id = id_declarator->u.id.unqualified_name;
8596 switch (TREE_CODE (unqualified_id))
8599 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8600 if (TYPE_P (unqualified_id))
8601 unqualified_id = constructor_name (unqualified_id);
8604 case IDENTIFIER_NODE:
8605 case TEMPLATE_ID_EXPR:
8613 /* Determine the type of the entity declared by recurring on the
8615 for (; declarator; declarator = declarator->declarator)
8617 const cp_declarator *inner_declarator;
8620 if (type == error_mark_node)
8621 return error_mark_node;
8623 attrs = declarator->attributes;
8629 if (declarator == NULL || declarator->kind == cdk_id)
8630 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8631 if (declarator->kind == cdk_function)
8632 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8633 if (declarator->kind == cdk_array)
8634 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8635 returned_attrs = decl_attributes (&type,
8636 chainon (returned_attrs, attrs),
8640 if (declarator->kind == cdk_id)
8643 inner_declarator = declarator->declarator;
8645 switch (declarator->kind)
8648 type = create_array_type_for_decl (dname, type,
8649 declarator->u.array.bounds);
8657 /* Declaring a function type.
8658 Make sure we have a valid type for the function to return. */
8660 if (type_quals != TYPE_UNQUALIFIED)
8662 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8663 warning (OPT_Wignored_qualifiers,
8664 "type qualifiers ignored on function return type");
8665 /* We now know that the TYPE_QUALS don't apply to the
8666 decl, but to its return type. */
8667 type_quals = TYPE_UNQUALIFIED;
8669 errmsg = targetm.invalid_return_type (type);
8673 type = integer_type_node;
8676 /* Error about some types functions can't return. */
8678 if (TREE_CODE (type) == FUNCTION_TYPE)
8680 error ("%qs declared as function returning a function", name);
8681 return error_mark_node;
8683 if (TREE_CODE (type) == ARRAY_TYPE)
8685 error ("%qs declared as function returning an array", name);
8686 return error_mark_node;
8689 /* Pick up type qualifiers which should be applied to `this'. */
8690 memfn_quals = declarator->u.function.qualifiers;
8692 /* Pick up the exception specifications. */
8693 raises = declarator->u.function.exception_specification;
8695 /* Say it's a definition only for the CALL_EXPR
8696 closest to the identifier. */
8697 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8699 /* Handle a late-specified return type. */
8702 if (type_uses_auto (type))
8704 if (!declarator->u.function.late_return_type)
8706 error ("%qs function uses %<auto%> type specifier without"
8707 " late return type", name);
8708 return error_mark_node;
8710 else if (!is_auto (type))
8712 error ("%qs function with late return type has"
8713 " %qT as its type rather than plain %<auto%>",
8715 return error_mark_node;
8718 else if (declarator->u.function.late_return_type)
8720 error ("%qs function with late return type not declared"
8721 " with %<auto%> type specifier", name);
8722 return error_mark_node;
8725 type = splice_late_return_type
8726 (type, declarator->u.function.late_return_type);
8727 if (type == error_mark_node)
8728 return error_mark_node;
8730 if (ctype == NULL_TREE
8731 && decl_context == FIELD
8733 && (friendp == 0 || dname == current_class_name))
8734 ctype = current_class_type;
8736 if (ctype && (sfk == sfk_constructor
8737 || sfk == sfk_destructor))
8739 /* We are within a class's scope. If our declarator name
8740 is the same as the class name, and we are defining
8741 a function, then it is a constructor/destructor, and
8742 therefore returns a void type. */
8744 /* ISO C++ 12.4/2. A destructor may not be declared
8745 const or volatile. A destructor may not be
8748 ISO C++ 12.1. A constructor may not be declared
8749 const or volatile. A constructor may not be
8750 virtual. A constructor may not be static. */
8752 error ((flags == DTOR_FLAG)
8753 ? "destructor cannot be static member function"
8754 : "constructor cannot be static member function");
8757 error ((flags == DTOR_FLAG)
8758 ? "destructors may not be cv-qualified"
8759 : "constructors may not be cv-qualified");
8760 memfn_quals = TYPE_UNQUALIFIED;
8763 if (decl_context == FIELD
8764 && !member_function_or_else (ctype,
8767 return error_mark_node;
8769 if (flags != DTOR_FLAG)
8771 /* It's a constructor. */
8776 permerror (input_location, "constructors cannot be declared virtual");
8779 if (decl_context == FIELD
8780 && sfk != sfk_constructor)
8781 return error_mark_node;
8783 if (decl_context == FIELD)
8789 error ("can't initialize friend function %qs", name);
8792 /* Cannot be both friend and virtual. */
8793 error ("virtual functions cannot be friends");
8796 if (decl_context == NORMAL)
8797 error ("friend declaration not in class definition");
8798 if (current_function_decl && funcdef_flag)
8799 error ("can't define friend function %qs in a local "
8803 else if (ctype && sfk == sfk_conversion)
8807 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8812 arg_types = grokparms (declarator->u.function.parameters,
8815 if (inner_declarator
8816 && inner_declarator->kind == cdk_id
8817 && inner_declarator->u.id.sfk == sfk_destructor
8818 && arg_types != void_list_node)
8820 error ("destructors may not have parameters");
8821 arg_types = void_list_node;
8825 type = build_function_type (type, arg_types);
8832 /* Filter out pointers-to-references and references-to-references.
8833 We can get these if a TYPE_DECL is used. */
8835 if (TREE_CODE (type) == REFERENCE_TYPE)
8837 if (declarator->kind != cdk_reference)
8839 error ("cannot declare pointer to %q#T", type);
8840 type = TREE_TYPE (type);
8843 /* In C++0x, we allow reference to reference declarations
8844 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8845 and template type arguments [14.3.1/4 temp.arg.type]. The
8846 check for direct reference to reference declarations, which
8847 are still forbidden, occurs below. Reasoning behind the change
8848 can be found in DR106, DR540, and the rvalue reference
8850 else if (cxx_dialect == cxx98)
8852 error ("cannot declare reference to %q#T", type);
8853 type = TREE_TYPE (type);
8856 else if (VOID_TYPE_P (type))
8858 if (declarator->kind == cdk_reference)
8859 error ("cannot declare reference to %q#T", type);
8860 else if (declarator->kind == cdk_ptrmem)
8861 error ("cannot declare pointer to %q#T member", type);
8864 /* We now know that the TYPE_QUALS don't apply to the decl,
8865 but to the target of the pointer. */
8866 type_quals = TYPE_UNQUALIFIED;
8868 if (declarator->kind == cdk_ptrmem
8869 && (TREE_CODE (type) == FUNCTION_TYPE
8870 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8872 memfn_quals |= type_memfn_quals (type);
8873 type = build_memfn_type (type,
8874 declarator->u.pointer.class_type,
8876 if (type == error_mark_node)
8877 return error_mark_node;
8878 memfn_quals = TYPE_UNQUALIFIED;
8881 if (TREE_CODE (type) == FUNCTION_TYPE
8882 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8883 error (declarator->kind == cdk_reference
8884 ? G_("cannot declare reference to qualified function type %qT")
8885 : G_("cannot declare pointer to qualified function type %qT"),
8888 /* When the pointed-to type involves components of variable size,
8889 care must be taken to ensure that the size evaluation code is
8890 emitted early enough to dominate all the possible later uses
8891 and late enough for the variables on which it depends to have
8894 This is expected to happen automatically when the pointed-to
8895 type has a name/declaration of it's own, but special attention
8896 is required if the type is anonymous.
8898 We handle the NORMAL and FIELD contexts here by inserting a
8899 dummy statement that just evaluates the size at a safe point
8900 and ensures it is not deferred until e.g. within a deeper
8901 conditional context (c++/43555).
8903 We expect nothing to be needed here for PARM or TYPENAME.
8904 Evaluating the size at this point for TYPENAME would
8905 actually be incorrect, as we might be in the middle of an
8906 expression with side effects on the pointed-to type size
8907 "arguments" prior to the pointer declaration point and the
8908 size evaluation could end up prior to the side effects. */
8910 if (!TYPE_NAME (type)
8911 && (decl_context == NORMAL || decl_context == FIELD)
8912 && at_function_scope_p ()
8913 && variably_modified_type_p (type, NULL_TREE))
8914 finish_expr_stmt (TYPE_SIZE (type));
8916 if (declarator->kind == cdk_reference)
8918 /* In C++0x, the type we are creating a reference to might be
8919 a typedef which is itself a reference type. In that case,
8920 we follow the reference collapsing rules in
8921 [7.1.3/8 dcl.typedef] to create the final reference type:
8923 "If a typedef TD names a type that is a reference to a type
8924 T, an attempt to create the type 'lvalue reference to cv TD'
8925 creates the type 'lvalue reference to T,' while an attempt
8926 to create the type "rvalue reference to cv TD' creates the
8929 if (!VOID_TYPE_P (type))
8930 type = cp_build_reference_type
8931 ((TREE_CODE (type) == REFERENCE_TYPE
8932 ? TREE_TYPE (type) : type),
8933 (declarator->u.reference.rvalue_ref
8934 && (TREE_CODE(type) != REFERENCE_TYPE
8935 || TYPE_REF_IS_RVALUE (type))));
8937 /* In C++0x, we need this check for direct reference to
8938 reference declarations, which are forbidden by
8939 [8.3.2/5 dcl.ref]. Reference to reference declarations
8940 are only allowed indirectly through typedefs and template
8941 type arguments. Example:
8943 void foo(int & &); // invalid ref-to-ref decl
8945 typedef int & int_ref;
8946 void foo(int_ref &); // valid ref-to-ref decl
8948 if (inner_declarator && inner_declarator->kind == cdk_reference)
8949 error ("cannot declare reference to %q#T, which is not "
8950 "a typedef or a template type argument", type);
8952 else if (TREE_CODE (type) == METHOD_TYPE)
8953 type = build_ptrmemfunc_type (build_pointer_type (type));
8954 else if (declarator->kind == cdk_ptrmem)
8956 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8958 if (declarator->u.pointer.class_type == error_mark_node)
8959 /* We will already have complained. */
8960 type = error_mark_node;
8962 type = build_ptrmem_type (declarator->u.pointer.class_type,
8966 type = build_pointer_type (type);
8968 /* Process a list of type modifier keywords (such as
8969 const or volatile) that were given inside the `*' or `&'. */
8971 if (declarator->u.pointer.qualifiers)
8974 = cp_build_qualified_type (type,
8975 declarator->u.pointer.qualifiers);
8976 type_quals = cp_type_quals (type);
8989 /* A `constexpr' specifier used in an object declaration declares
8990 the object as `const'. */
8991 if (constexpr_p && innermost_code != cdk_function)
8993 if (type_quals & TYPE_QUAL_CONST)
8994 error ("both %<const%> and %<constexpr%> cannot be used here");
8995 if (type_quals & TYPE_QUAL_VOLATILE)
8996 error ("both %<volatile%> and %<constexpr%> cannot be used here");
8997 type_quals |= TYPE_QUAL_CONST;
8998 type = cp_build_qualified_type (type, type_quals);
9001 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9002 && TREE_CODE (type) != FUNCTION_TYPE
9003 && TREE_CODE (type) != METHOD_TYPE)
9005 error ("template-id %qD used as a declarator",
9007 unqualified_id = dname;
9010 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9011 qualified with a class-name, turn it into a METHOD_TYPE, unless
9012 we know that the function is static. We take advantage of this
9013 opportunity to do other processing that pertains to entities
9014 explicitly declared to be class members. Note that if DECLARATOR
9015 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9016 would not have exited the loop above. */
9018 && declarator->u.id.qualifying_scope
9019 && TYPE_P (declarator->u.id.qualifying_scope))
9023 ctype = declarator->u.id.qualifying_scope;
9024 ctype = TYPE_MAIN_VARIANT (ctype);
9026 while (t != NULL_TREE && CLASS_TYPE_P (t))
9028 /* You're supposed to have one `template <...>' for every
9029 template class, but you don't need one for a full
9030 specialization. For example:
9032 template <class T> struct S{};
9033 template <> struct S<int> { void f(); };
9034 void S<int>::f () {}
9036 is correct; there shouldn't be a `template <>' for the
9037 definition of `S<int>::f'. */
9038 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9039 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9040 /* T is an explicit (not partial) specialization. All
9041 containing classes must therefore also be explicitly
9044 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9045 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9046 template_count += 1;
9048 t = TYPE_MAIN_DECL (t);
9049 t = DECL_CONTEXT (t);
9052 if (ctype == current_class_type)
9056 permerror (input_location, "member functions are implicitly friends of their class");
9060 permerror (declarator->id_loc,
9061 "extra qualification %<%T::%> on member %qs",
9064 else if (/* If the qualifying type is already complete, then we
9065 can skip the following checks. */
9066 !COMPLETE_TYPE_P (ctype)
9067 && (/* If the function is being defined, then
9068 qualifying type must certainly be complete. */
9070 /* A friend declaration of "T::f" is OK, even if
9071 "T" is a template parameter. But, if this
9072 function is not a friend, the qualifying type
9074 || (!friendp && !CLASS_TYPE_P (ctype))
9075 /* For a declaration, the type need not be
9076 complete, if either it is dependent (since there
9077 is no meaningful definition of complete in that
9078 case) or the qualifying class is currently being
9080 || !(dependent_type_p (ctype)
9081 || currently_open_class (ctype)))
9082 /* Check that the qualifying type is complete. */
9083 && !complete_type_or_else (ctype, NULL_TREE))
9084 return error_mark_node;
9085 else if (TREE_CODE (type) == FUNCTION_TYPE)
9087 if (current_class_type
9088 && (!friendp || funcdef_flag))
9091 ? "cannot define member function %<%T::%s%> within %<%T%>"
9092 : "cannot declare member function %<%T::%s%> within %<%T%>",
9093 ctype, name, current_class_type);
9094 return error_mark_node;
9097 else if (declspecs->specs[(int)ds_typedef]
9098 && current_class_type)
9100 error ("cannot declare member %<%T::%s%> within %qT",
9101 ctype, name, current_class_type);
9102 return error_mark_node;
9106 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9107 ctype = current_class_type;
9109 /* A constexpr non-static member function is implicitly const. */
9110 if (constexpr_p && ctype && staticp == 0
9111 && TREE_CODE (type) == FUNCTION_TYPE
9112 && sfk != sfk_constructor && sfk != sfk_destructor)
9113 memfn_quals |= TYPE_QUAL_CONST;
9115 /* Now TYPE has the actual type. */
9120 *attrlist = chainon (returned_attrs, *attrlist);
9122 attrlist = &returned_attrs;
9125 /* Handle parameter packs. */
9126 if (parameter_pack_p)
9128 if (decl_context == PARM)
9129 /* Turn the type into a pack expansion.*/
9130 type = make_pack_expansion (type);
9132 error ("non-parameter %qs cannot be a parameter pack", name);
9135 /* Did array size calculations overflow? */
9137 if (TREE_CODE (type) == ARRAY_TYPE
9138 && COMPLETE_TYPE_P (type)
9139 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9140 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9142 error ("size of array %qs is too large", name);
9143 /* If we proceed with the array type as it is, we'll eventually
9144 crash in tree_low_cst(). */
9145 type = error_mark_node;
9148 if ((decl_context == FIELD || decl_context == PARM)
9149 && !processing_template_decl
9150 && variably_modified_type_p (type, NULL_TREE))
9152 if (decl_context == FIELD)
9153 error ("data member may not have variably modified type %qT", type);
9155 error ("parameter may not have variably modified type %qT", type);
9156 type = error_mark_node;
9159 if (explicitp == 1 || (explicitp && friendp))
9161 /* [dcl.fct.spec] The explicit specifier shall only be used in
9162 declarations of constructors within a class definition. */
9163 error ("only declarations of constructors can be %<explicit%>");
9167 if (storage_class == sc_mutable)
9169 if (decl_context != FIELD || friendp)
9171 error ("non-member %qs cannot be declared %<mutable%>", name);
9172 storage_class = sc_none;
9174 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9176 error ("non-object member %qs cannot be declared %<mutable%>", name);
9177 storage_class = sc_none;
9179 else if (TREE_CODE (type) == FUNCTION_TYPE
9180 || TREE_CODE (type) == METHOD_TYPE)
9182 error ("function %qs cannot be declared %<mutable%>", name);
9183 storage_class = sc_none;
9187 error ("static %qs cannot be declared %<mutable%>", name);
9188 storage_class = sc_none;
9190 else if (type_quals & TYPE_QUAL_CONST)
9192 error ("const %qs cannot be declared %<mutable%>", name);
9193 storage_class = sc_none;
9197 /* If this is declaring a typedef name, return a TYPE_DECL. */
9198 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9202 /* Note that the grammar rejects storage classes
9203 in typenames, fields or parameters. */
9204 if (current_lang_name == lang_name_java)
9205 TYPE_FOR_JAVA (type) = 1;
9207 /* This declaration:
9209 typedef void f(int) const;
9211 declares a function type which is not a member of any
9212 particular class, but which is cv-qualified; for
9213 example "f S::*" declares a pointer to a const-qualified
9214 member function of S. We record the cv-qualification in the
9216 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9218 type = apply_memfn_quals (type, memfn_quals);
9220 /* We have now dealt with these qualifiers. */
9221 memfn_quals = TYPE_UNQUALIFIED;
9224 if (decl_context == FIELD)
9225 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9227 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9228 if (id_declarator && declarator->u.id.qualifying_scope) {
9229 error_at (DECL_SOURCE_LOCATION (decl),
9230 "typedef name may not be a nested-name-specifier");
9231 TREE_TYPE (decl) = error_mark_node;
9234 if (decl_context != FIELD)
9236 if (!current_function_decl)
9237 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9238 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9239 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9240 (current_function_decl)))
9241 /* The TYPE_DECL is "abstract" because there will be
9242 clones of this constructor/destructor, and there will
9243 be copies of this TYPE_DECL generated in those
9245 DECL_ABSTRACT (decl) = 1;
9247 else if (constructor_name_p (unqualified_id, current_class_type))
9248 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9249 "as enclosing class",
9252 /* If the user declares "typedef struct {...} foo" then the
9253 struct will have an anonymous name. Fill that name in now.
9254 Nothing can refer to it, so nothing needs know about the name
9256 if (type != error_mark_node
9259 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9260 && TYPE_ANONYMOUS_P (type)
9261 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9265 /* Replace the anonymous name with the real name everywhere. */
9266 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9268 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9269 /* We do not rename the debug info representing the
9270 anonymous tagged type because the standard says in
9271 [dcl.typedef] that the naming applies only for
9272 linkage purposes. */
9273 /*debug_hooks->set_name (t, decl);*/
9274 TYPE_NAME (t) = decl;
9277 if (TYPE_LANG_SPECIFIC (type))
9278 TYPE_WAS_ANONYMOUS (type) = 1;
9280 /* If this is a typedef within a template class, the nested
9281 type is a (non-primary) template. The name for the
9282 template needs updating as well. */
9283 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9284 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9285 = TYPE_IDENTIFIER (type);
9287 /* Adjust linkage now that we aren't anonymous anymore. */
9288 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9289 determine_visibility (TYPE_MAIN_DECL (type));
9291 /* FIXME remangle member functions; member functions of a
9292 type with external linkage have external linkage. */
9296 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9297 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9299 bad_specifiers (decl, BSP_TYPE, virtualp,
9300 memfn_quals != TYPE_UNQUALIFIED,
9301 inlinep, friendp, raises != NULL_TREE);
9306 /* Detect the case of an array type of unspecified size
9307 which came, as such, direct from a typedef name.
9308 We must copy the type, so that the array's domain can be
9309 individually set by the object's initializer. */
9311 if (type && typedef_type
9312 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9313 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9314 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9316 /* Detect where we're using a typedef of function type to declare a
9317 function. PARMS will not be set, so we must create it now. */
9319 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9321 tree decls = NULL_TREE;
9324 for (args = TYPE_ARG_TYPES (type);
9325 args && args != void_list_node;
9326 args = TREE_CHAIN (args))
9328 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9330 DECL_CHAIN (decl) = decls;
9334 parms = nreverse (decls);
9336 if (decl_context != TYPENAME)
9338 /* A cv-qualifier-seq shall only be part of the function type
9339 for a non-static member function. [8.3.5/4 dcl.fct] */
9340 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9341 && (current_class_type == NULL_TREE || staticp) )
9344 ? G_("qualified function types cannot be used to "
9345 "declare static member functions")
9346 : G_("qualified function types cannot be used to "
9347 "declare free functions"));
9348 type = TYPE_MAIN_VARIANT (type);
9351 /* The qualifiers on the function type become the qualifiers on
9352 the non-static member function. */
9353 memfn_quals |= type_memfn_quals (type);
9354 type_quals = TYPE_UNQUALIFIED;
9358 /* If this is a type name (such as, in a cast or sizeof),
9359 compute the type and return it now. */
9361 if (decl_context == TYPENAME)
9363 /* Note that the grammar rejects storage classes
9364 in typenames, fields or parameters. */
9365 if (type_quals != TYPE_UNQUALIFIED)
9366 type_quals = TYPE_UNQUALIFIED;
9368 /* Special case: "friend class foo" looks like a TYPENAME context. */
9371 if (type_quals != TYPE_UNQUALIFIED)
9373 error ("type qualifiers specified for friend class declaration");
9374 type_quals = TYPE_UNQUALIFIED;
9378 error ("%<inline%> specified for friend class declaration");
9384 /* Don't allow friend declaration without a class-key. */
9385 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9386 permerror (input_location, "template parameters cannot be friends");
9387 else if (TREE_CODE (type) == TYPENAME_TYPE)
9388 permerror (input_location, "friend declaration requires class-key, "
9389 "i.e. %<friend class %T::%D%>",
9390 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9392 permerror (input_location, "friend declaration requires class-key, "
9393 "i.e. %<friend %#T%>",
9397 /* Only try to do this stuff if we didn't already give up. */
9398 if (type != integer_type_node)
9400 /* A friendly class? */
9401 if (current_class_type)
9402 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9405 error ("trying to make class %qT a friend of global scope",
9408 type = void_type_node;
9411 else if (memfn_quals)
9413 if (ctype == NULL_TREE
9414 && TREE_CODE (type) == METHOD_TYPE)
9415 ctype = TYPE_METHOD_BASETYPE (type);
9418 type = build_memfn_type (type, ctype, memfn_quals);
9419 /* Core issue #547: need to allow this in template type args. */
9420 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9421 type = apply_memfn_quals (type, memfn_quals);
9423 error ("invalid qualifiers on non-member function type");
9428 else if (unqualified_id == NULL_TREE && decl_context != PARM
9429 && decl_context != CATCHPARM
9430 && TREE_CODE (type) != UNION_TYPE
9433 error ("abstract declarator %qT used as declaration", type);
9434 return error_mark_node;
9437 /* Only functions may be declared using an operator-function-id. */
9439 && IDENTIFIER_OPNAME_P (unqualified_id)
9440 && TREE_CODE (type) != FUNCTION_TYPE
9441 && TREE_CODE (type) != METHOD_TYPE)
9443 error ("declaration of %qD as non-function", unqualified_id);
9444 return error_mark_node;
9447 /* We don't check parameter types here because we can emit a better
9448 error message later. */
9449 if (decl_context != PARM)
9451 type = check_var_type (unqualified_id, type);
9452 if (type == error_mark_node)
9453 return error_mark_node;
9456 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9457 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9459 if (decl_context == PARM || decl_context == CATCHPARM)
9461 if (ctype || in_namespace)
9462 error ("cannot use %<::%> in parameter declaration");
9464 /* A parameter declared as an array of T is really a pointer to T.
9465 One declared as a function is really a pointer to a function.
9466 One declared as a member is really a pointer to member. */
9468 if (TREE_CODE (type) == ARRAY_TYPE)
9470 /* Transfer const-ness of array into that of type pointed to. */
9471 type = build_pointer_type (TREE_TYPE (type));
9472 type_quals = TYPE_UNQUALIFIED;
9474 else if (TREE_CODE (type) == FUNCTION_TYPE)
9475 type = build_pointer_type (type);
9478 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9479 && !NEW_DELETE_OPNAME_P (unqualified_id))
9480 type = build_memfn_type (type, ctype, memfn_quals);
9485 if (decl_context == PARM)
9487 decl = cp_build_parm_decl (unqualified_id, type);
9489 bad_specifiers (decl, BSP_PARM, virtualp,
9490 memfn_quals != TYPE_UNQUALIFIED,
9491 inlinep, friendp, raises != NULL_TREE);
9493 else if (decl_context == FIELD)
9495 /* The C99 flexible array extension. */
9496 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9497 && TYPE_DOMAIN (type) == NULL_TREE)
9499 tree itype = compute_array_index_type (dname, integer_zero_node,
9500 tf_warning_or_error);
9501 type = build_cplus_array_type (TREE_TYPE (type), itype);
9504 if (type == error_mark_node)
9506 /* Happens when declaring arrays of sizes which
9507 are error_mark_node, for example. */
9510 else if (in_namespace && !friendp)
9512 /* Something like struct S { int N::j; }; */
9513 error ("invalid use of %<::%>");
9514 return error_mark_node;
9516 else if (TREE_CODE (type) == FUNCTION_TYPE
9517 || TREE_CODE (type) == METHOD_TYPE)
9520 tree function_context;
9526 /* ``A union may [ ... ] not [ have ] virtual functions.''
9528 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9530 error ("function %qD declared virtual inside a union",
9532 return error_mark_node;
9535 if (NEW_DELETE_OPNAME_P (unqualified_id))
9539 error ("%qD cannot be declared virtual, since it "
9547 /* Check that the name used for a destructor makes sense. */
9548 if (sfk == sfk_destructor)
9550 tree uqname = id_declarator->u.id.unqualified_name;
9554 gcc_assert (friendp);
9555 error ("expected qualified name in friend declaration "
9556 "for destructor %qD", uqname);
9557 return error_mark_node;
9560 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9562 error ("declaration of %qD as member of %qT",
9564 return error_mark_node;
9568 error ("a destructor cannot be %<constexpr%>");
9569 return error_mark_node;
9572 else if (sfk == sfk_constructor && friendp && !ctype)
9574 error ("expected qualified name in friend declaration "
9575 "for constructor %qD",
9576 id_declarator->u.id.unqualified_name);
9577 return error_mark_node;
9580 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9581 function_context = (ctype != NULL_TREE) ?
9582 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9583 publicp = (! friendp || ! staticp)
9584 && function_context == NULL_TREE;
9585 decl = grokfndecl (ctype, type,
9586 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9587 ? unqualified_id : dname,
9590 virtualp, flags, memfn_quals, raises,
9591 friendp ? -1 : 0, friendp, publicp,
9592 inlinep | (2 * constexpr_p),
9594 funcdef_flag, template_count, in_namespace,
9595 attrlist, declarator->id_loc);
9596 if (decl == NULL_TREE)
9597 return error_mark_node;
9599 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9600 /* The decl and setting of decl_attr is also turned off. */
9601 decl = build_decl_attribute_variant (decl, decl_attr);
9604 /* [class.conv.ctor]
9606 A constructor declared without the function-specifier
9607 explicit that can be called with a single parameter
9608 specifies a conversion from the type of its first
9609 parameter to the type of its class. Such a constructor
9610 is called a converting constructor. */
9612 DECL_NONCONVERTING_P (decl) = 1;
9614 else if (!staticp && !dependent_type_p (type)
9615 && !COMPLETE_TYPE_P (complete_type (type))
9616 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9619 error ("field %qD has incomplete type", unqualified_id);
9621 error ("name %qT has incomplete type", type);
9623 /* If we're instantiating a template, tell them which
9624 instantiation made the field's type be incomplete. */
9625 if (current_class_type
9626 && TYPE_NAME (current_class_type)
9627 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9629 && declspecs->type == type)
9630 error (" in instantiation of template %qT",
9631 current_class_type);
9633 return error_mark_node;
9639 error ("%qE is neither function nor member function; "
9640 "cannot be declared friend", unqualified_id);
9648 /* Friends are treated specially. */
9649 if (ctype == current_class_type)
9650 ; /* We already issued a permerror. */
9651 else if (decl && DECL_NAME (decl))
9653 if (template_class_depth (current_class_type) == 0)
9655 decl = check_explicit_specialization
9656 (unqualified_id, decl, template_count,
9657 2 * funcdef_flag + 4);
9658 if (decl == error_mark_node)
9659 return error_mark_node;
9662 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9663 decl = do_friend (ctype, unqualified_id, decl,
9669 return error_mark_node;
9672 /* Structure field. It may not be a function, except for C++. */
9674 if (decl == NULL_TREE)
9680 /* An attempt is being made to initialize a non-static
9681 member. But, from [class.mem]:
9683 4 A member-declarator can contain a
9684 constant-initializer only if it declares a static
9685 member (_class.static_) of integral or enumeration
9686 type, see _class.static.data_.
9688 This used to be relatively common practice, but
9689 the rest of the compiler does not correctly
9690 handle the initialization unless the member is
9691 static so we make it static below. */
9692 if (cxx_dialect >= cxx0x)
9694 sorry ("non-static data member initializers");
9698 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9700 permerror (input_location, "making %qD static", unqualified_id);
9705 if (uses_template_parms (type))
9706 /* We'll check at instantiation time. */
9708 else if (constexpr_p)
9709 /* constexpr has the same requirements. */
9711 else if (check_static_variable_definition (unqualified_id,
9713 /* If we just return the declaration, crashes
9714 will sometimes occur. We therefore return
9715 void_type_node, as if this was a friend
9716 declaration, to cause callers to completely
9717 ignore this declaration. */
9718 return error_mark_node;
9723 /* C++ allows static class members. All other work
9724 for this is done by grokfield. */
9725 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9726 set_linkage_for_static_data_member (decl);
9727 /* Even if there is an in-class initialization, DECL
9728 is considered undefined until an out-of-class
9729 definition is provided. */
9730 DECL_EXTERNAL (decl) = 1;
9733 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9739 error ("non-static data member %qE declared %<constexpr%>",
9741 constexpr_p = false;
9743 decl = build_decl (input_location,
9744 FIELD_DECL, unqualified_id, type);
9745 DECL_NONADDRESSABLE_P (decl) = bitfield;
9746 if (bitfield && !unqualified_id)
9747 TREE_NO_WARNING (decl) = 1;
9749 if (storage_class == sc_mutable)
9751 DECL_MUTABLE_P (decl) = 1;
9752 storage_class = sc_none;
9756 bad_specifiers (decl, BSP_FIELD, virtualp,
9757 memfn_quals != TYPE_UNQUALIFIED,
9758 inlinep, friendp, raises != NULL_TREE);
9761 else if (TREE_CODE (type) == FUNCTION_TYPE
9762 || TREE_CODE (type) == METHOD_TYPE)
9767 if (!unqualified_id)
9768 return error_mark_node;
9770 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9771 original_name = dname;
9773 original_name = unqualified_id;
9775 if (storage_class == sc_auto)
9776 error ("storage class %<auto%> invalid for function %qs", name);
9777 else if (storage_class == sc_register)
9778 error ("storage class %<register%> invalid for function %qs", name);
9780 error ("storage class %<__thread%> invalid for function %qs", name);
9782 /* Function declaration not at top level.
9783 Storage classes other than `extern' are not allowed
9784 and `extern' makes no difference. */
9785 if (! toplevel_bindings_p ()
9786 && (storage_class == sc_static
9787 || declspecs->specs[(int)ds_inline])
9790 if (storage_class == sc_static)
9791 pedwarn (input_location, OPT_pedantic,
9792 "%<static%> specified invalid for function %qs "
9793 "declared out of global scope", name);
9795 pedwarn (input_location, OPT_pedantic,
9796 "%<inline%> specifier invalid for function %qs "
9797 "declared out of global scope", name);
9800 if (ctype != NULL_TREE
9801 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9803 error ("%q#T is not a class or a namespace", ctype);
9807 if (ctype == NULL_TREE)
9811 error ("virtual non-class function %qs", name);
9814 else if (sfk == sfk_constructor
9815 || sfk == sfk_destructor)
9818 ? "%qs defined in a non-class scope"
9819 : "%qs declared in a non-class scope", name);
9824 /* Record presence of `static'. */
9825 publicp = (ctype != NULL_TREE
9826 || storage_class == sc_extern
9827 || storage_class != sc_static);
9829 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9830 virtualp, flags, memfn_quals, raises,
9832 publicp, inlinep | (2 * constexpr_p), sfk,
9834 template_count, in_namespace, attrlist,
9835 declarator->id_loc);
9836 if (decl == NULL_TREE)
9837 return error_mark_node;
9841 int invalid_static = 0;
9843 /* Don't allow a static member function in a class, and forbid
9844 declaring main to be static. */
9845 if (TREE_CODE (type) == METHOD_TYPE)
9847 permerror (input_location, "cannot declare member function %qD to have "
9848 "static linkage", decl);
9851 else if (current_function_decl)
9853 /* FIXME need arm citation */
9854 error ("cannot declare static function inside another function");
9861 storage_class = sc_none;
9867 /* It's a variable. */
9869 /* An uninitialized decl with `extern' is a reference. */
9870 decl = grokvardecl (type, unqualified_id,
9873 (type_quals & TYPE_QUAL_CONST) != 0,
9874 ctype ? ctype : in_namespace);
9875 bad_specifiers (decl, BSP_VAR, virtualp,
9876 memfn_quals != TYPE_UNQUALIFIED,
9877 inlinep, friendp, raises != NULL_TREE);
9881 DECL_CONTEXT (decl) = ctype;
9884 permerror (input_location, "%<static%> may not be used when defining "
9885 "(as opposed to declaring) a static data member");
9887 storage_class = sc_none;
9889 if (storage_class == sc_register && TREE_STATIC (decl))
9891 error ("static member %qD declared %<register%>", decl);
9892 storage_class = sc_none;
9894 if (storage_class == sc_extern && pedantic)
9896 pedwarn (input_location, OPT_pedantic,
9897 "cannot explicitly declare member %q#D to have "
9898 "extern linkage", decl);
9899 storage_class = sc_none;
9902 else if (constexpr_p && DECL_EXTERNAL (decl))
9903 error ("declaration of constexpr variable %qD is not a definition",
9907 if (storage_class == sc_extern && initialized && !funcdef_flag)
9909 if (toplevel_bindings_p ())
9911 /* It's common practice (and completely valid) to have a const
9912 be initialized and declared extern. */
9913 if (!(type_quals & TYPE_QUAL_CONST))
9914 warning (0, "%qs initialized and declared %<extern%>", name);
9918 error ("%qs has both %<extern%> and initializer", name);
9919 return error_mark_node;
9923 /* Record `register' declaration for warnings on &
9924 and in case doing stupid register allocation. */
9926 if (storage_class == sc_register)
9927 DECL_REGISTER (decl) = 1;
9928 else if (storage_class == sc_extern)
9929 DECL_THIS_EXTERN (decl) = 1;
9930 else if (storage_class == sc_static)
9931 DECL_THIS_STATIC (decl) = 1;
9933 /* Don't forget constexprness. */
9935 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9937 /* Record constancy and volatility on the DECL itself . There's
9938 no need to do this when processing a template; we'll do this
9939 for the instantiated declaration based on the type of DECL. */
9940 if (!processing_template_decl)
9941 cp_apply_type_quals_to_decl (type_quals, decl);
9947 /* Subroutine of start_function. Ensure that each of the parameter
9948 types (as listed in PARMS) is complete, as is required for a
9949 function definition. */
9952 require_complete_types_for_parms (tree parms)
9954 for (; parms; parms = DECL_CHAIN (parms))
9956 if (dependent_type_p (TREE_TYPE (parms)))
9958 if (!VOID_TYPE_P (TREE_TYPE (parms))
9959 && complete_type_or_else (TREE_TYPE (parms), parms))
9961 relayout_decl (parms);
9962 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9965 /* grokparms or complete_type_or_else will have already issued
9967 TREE_TYPE (parms) = error_mark_node;
9971 /* Returns nonzero if T is a local variable. */
9974 local_variable_p (const_tree t)
9976 if ((TREE_CODE (t) == VAR_DECL
9977 /* A VAR_DECL with a context that is a _TYPE is a static data
9979 && !TYPE_P (CP_DECL_CONTEXT (t))
9980 /* Any other non-local variable must be at namespace scope. */
9981 && !DECL_NAMESPACE_SCOPE_P (t))
9982 || (TREE_CODE (t) == PARM_DECL))
9988 /* Like local_variable_p, but suitable for use as a tree-walking
9992 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9993 void *data ATTRIBUTE_UNUSED)
9995 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9997 else if (TYPE_P (*tp))
10004 /* Check that ARG, which is a default-argument expression for a
10005 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10006 something goes wrong. DECL may also be a _TYPE node, rather than a
10007 DECL, if there is no DECL available. */
10010 check_default_argument (tree decl, tree arg)
10015 if (TREE_CODE (arg) == DEFAULT_ARG)
10016 /* We get a DEFAULT_ARG when looking at an in-class declaration
10017 with a default argument. Ignore the argument for now; we'll
10018 deal with it after the class is complete. */
10027 decl_type = TREE_TYPE (decl);
10029 if (arg == error_mark_node
10030 || decl == error_mark_node
10031 || TREE_TYPE (arg) == error_mark_node
10032 || decl_type == error_mark_node)
10033 /* Something already went wrong. There's no need to check
10035 return error_mark_node;
10037 /* [dcl.fct.default]
10039 A default argument expression is implicitly converted to the
10041 if (!TREE_TYPE (arg)
10042 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10045 error ("default argument for %q#D has type %qT",
10046 decl, TREE_TYPE (arg));
10048 error ("default argument for parameter of type %qT has type %qT",
10049 decl_type, TREE_TYPE (arg));
10051 return error_mark_node;
10054 /* [dcl.fct.default]
10056 Local variables shall not be used in default argument
10059 The keyword `this' shall not be used in a default argument of a
10060 member function. */
10061 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10064 error ("default argument %qE uses local variable %qD", arg, var);
10065 return error_mark_node;
10072 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10075 type_is_deprecated (tree type)
10077 enum tree_code code;
10078 if (TREE_DEPRECATED (type))
10080 if (TYPE_NAME (type)
10081 && TREE_DEPRECATED (TYPE_NAME (type)))
10084 /* Do warn about using typedefs to a deprecated class. */
10085 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10086 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10088 code = TREE_CODE (type);
10090 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10091 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10092 || code == METHOD_TYPE || code == ARRAY_TYPE)
10093 return type_is_deprecated (TREE_TYPE (type));
10095 if (TYPE_PTRMEMFUNC_P (type))
10096 return type_is_deprecated
10097 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10102 /* Decode the list of parameter types for a function type.
10103 Given the list of things declared inside the parens,
10104 return a list of types.
10106 If this parameter does not end with an ellipsis, we append
10109 *PARMS is set to the chain of PARM_DECLs created. */
10112 grokparms (tree parmlist, tree *parms)
10114 tree result = NULL_TREE;
10115 tree decls = NULL_TREE;
10119 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10121 tree type = NULL_TREE;
10122 tree init = TREE_PURPOSE (parm);
10123 tree decl = TREE_VALUE (parm);
10124 const char *errmsg;
10126 if (parm == void_list_node)
10129 if (! decl || TREE_TYPE (decl) == error_mark_node)
10132 type = TREE_TYPE (decl);
10133 if (VOID_TYPE_P (type))
10135 if (same_type_p (type, void_type_node)
10136 && DECL_SELF_REFERENCE_P (type)
10137 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10138 /* this is a parmlist of `(void)', which is ok. */
10140 cxx_incomplete_type_error (decl, type);
10141 /* It's not a good idea to actually create parameters of
10142 type `void'; other parts of the compiler assume that a
10143 void type terminates the parameter list. */
10144 type = error_mark_node;
10145 TREE_TYPE (decl) = error_mark_node;
10148 if (type != error_mark_node
10149 && TYPE_FOR_JAVA (type)
10150 && MAYBE_CLASS_TYPE_P (type))
10152 error ("parameter %qD has Java class type", decl);
10153 type = error_mark_node;
10154 TREE_TYPE (decl) = error_mark_node;
10158 if (type != error_mark_node
10159 && (errmsg = targetm.invalid_parameter_type (type)))
10162 type = error_mark_node;
10163 TREE_TYPE (decl) = error_mark_node;
10166 if (type != error_mark_node)
10168 if (deprecated_state != DEPRECATED_SUPPRESS)
10170 tree deptype = type_is_deprecated (type);
10172 warn_deprecated_use (deptype, NULL_TREE);
10175 /* Top-level qualifiers on the parameters are
10176 ignored for function types. */
10177 type = cp_build_qualified_type (type, 0);
10178 if (TREE_CODE (type) == METHOD_TYPE)
10180 error ("parameter %qD invalidly declared method type", decl);
10181 type = build_pointer_type (type);
10182 TREE_TYPE (decl) = type;
10184 else if (abstract_virtuals_error (decl, type))
10185 any_error = 1; /* Seems like a good idea. */
10186 else if (POINTER_TYPE_P (type))
10188 /* [dcl.fct]/6, parameter types cannot contain pointers
10189 (references) to arrays of unknown bound. */
10190 tree t = TREE_TYPE (type);
10191 int ptr = TYPE_PTR_P (type);
10195 if (TYPE_PTR_P (t))
10197 else if (TREE_CODE (t) != ARRAY_TYPE)
10199 else if (!TYPE_DOMAIN (t))
10203 if (TREE_CODE (t) == ARRAY_TYPE)
10205 ? G_("parameter %qD includes pointer to array of "
10206 "unknown bound %qT")
10207 : G_("parameter %qD includes reference to array of "
10208 "unknown bound %qT"),
10214 else if (init && !processing_template_decl)
10215 init = check_default_argument (decl, init);
10218 if (TREE_CODE (decl) == PARM_DECL
10219 && FUNCTION_PARAMETER_PACK_P (decl)
10220 && TREE_CHAIN (parm)
10221 && TREE_CHAIN (parm) != void_list_node)
10222 error ("parameter packs must be at the end of the parameter list");
10224 DECL_CHAIN (decl) = decls;
10226 result = tree_cons (init, type, result);
10228 decls = nreverse (decls);
10229 result = nreverse (result);
10231 result = chainon (result, void_list_node);
10238 /* D is a constructor or overloaded `operator='.
10240 Let T be the class in which D is declared. Then, this function
10243 -1 if D's is an ill-formed constructor or copy assignment operator
10244 whose first parameter is of type `T'.
10245 0 if D is not a copy constructor or copy assignment
10247 1 if D is a copy constructor or copy assignment operator whose
10248 first parameter is a reference to non-const qualified T.
10249 2 if D is a copy constructor or copy assignment operator whose
10250 first parameter is a reference to const qualified T.
10252 This function can be used as a predicate. Positive values indicate
10253 a copy constructor and nonzero values indicate a copy assignment
10257 copy_fn_p (const_tree d)
10263 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10265 if (TREE_CODE (d) == TEMPLATE_DECL
10266 || (DECL_TEMPLATE_INFO (d)
10267 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10268 /* Instantiations of template member functions are never copy
10269 functions. Note that member functions of templated classes are
10270 represented as template functions internally, and we must
10271 accept those as copy functions. */
10274 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10278 arg_type = TREE_VALUE (args);
10279 if (arg_type == error_mark_node)
10282 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10284 /* Pass by value copy assignment operator. */
10287 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10288 && !TYPE_REF_IS_RVALUE (arg_type)
10289 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10291 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10297 args = TREE_CHAIN (args);
10299 if (args && args != void_list_node && !TREE_PURPOSE (args))
10300 /* There are more non-optional args. */
10306 /* D is a constructor or overloaded `operator='.
10308 Let T be the class in which D is declared. Then, this function
10309 returns true when D is a move constructor or move assignment
10310 operator, false otherwise. */
10313 move_fn_p (const_tree d)
10317 bool result = false;
10319 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10321 if (cxx_dialect == cxx98)
10322 /* There are no move constructors if we are in C++98 mode. */
10325 if (TREE_CODE (d) == TEMPLATE_DECL
10326 || (DECL_TEMPLATE_INFO (d)
10327 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10328 /* Instantiations of template member functions are never copy
10329 functions. Note that member functions of templated classes are
10330 represented as template functions internally, and we must
10331 accept those as copy functions. */
10334 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10338 arg_type = TREE_VALUE (args);
10339 if (arg_type == error_mark_node)
10342 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10343 && TYPE_REF_IS_RVALUE (arg_type)
10344 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10348 args = TREE_CHAIN (args);
10350 if (args && args != void_list_node && !TREE_PURPOSE (args))
10351 /* There are more non-optional args. */
10357 /* Remember any special properties of member function DECL. */
10360 grok_special_member_properties (tree decl)
10364 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10367 class_type = DECL_CONTEXT (decl);
10368 if (DECL_CONSTRUCTOR_P (decl))
10370 int ctor = copy_fn_p (decl);
10372 if (!DECL_ARTIFICIAL (decl))
10373 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10379 A non-template constructor for class X is a copy
10380 constructor if its first parameter is of type X&, const
10381 X&, volatile X& or const volatile X&, and either there
10382 are no other parameters or else all other parameters have
10383 default arguments. */
10384 TYPE_HAS_COPY_CTOR (class_type) = 1;
10385 if (user_provided_p (decl))
10386 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10388 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10390 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10392 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10393 if (user_provided_p (decl))
10394 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10396 else if (move_fn_p (decl) && user_provided_p (decl))
10397 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10398 else if (is_list_ctor (decl))
10399 TYPE_HAS_LIST_CTOR (class_type) = 1;
10401 if (DECL_DECLARED_CONSTEXPR_P (decl)
10402 && !copy_fn_p (decl) && !move_fn_p (decl))
10403 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10405 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10409 A non-template assignment operator for class X is a copy
10410 assignment operator if its parameter is of type X, X&, const
10411 X&, volatile X& or const volatile X&. */
10413 int assop = copy_fn_p (decl);
10417 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10418 if (user_provided_p (decl))
10419 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10421 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10423 else if (move_fn_p (decl) && user_provided_p (decl))
10424 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10426 /* Destructors are handled in check_methods. */
10429 /* Check a constructor DECL has the correct form. Complains
10430 if the class has a constructor of the form X(X). */
10433 grok_ctor_properties (const_tree ctype, const_tree decl)
10435 int ctor_parm = copy_fn_p (decl);
10441 A declaration of a constructor for a class X is ill-formed if
10442 its first parameter is of type (optionally cv-qualified) X
10443 and either there are no other parameters or else all other
10444 parameters have default arguments.
10446 We *don't* complain about member template instantiations that
10447 have this form, though; they can occur as we try to decide
10448 what constructor to use during overload resolution. Since
10449 overload resolution will never prefer such a constructor to
10450 the non-template copy constructor (which is either explicitly
10451 or implicitly defined), there's no need to worry about their
10452 existence. Theoretically, they should never even be
10453 instantiated, but that's hard to forestall. */
10454 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10462 /* An operator with this code is unary, but can also be binary. */
10465 ambi_op_p (enum tree_code code)
10467 return (code == INDIRECT_REF
10468 || code == ADDR_EXPR
10469 || code == UNARY_PLUS_EXPR
10470 || code == NEGATE_EXPR
10471 || code == PREINCREMENT_EXPR
10472 || code == PREDECREMENT_EXPR);
10475 /* An operator with this name can only be unary. */
10478 unary_op_p (enum tree_code code)
10480 return (code == TRUTH_NOT_EXPR
10481 || code == BIT_NOT_EXPR
10482 || code == COMPONENT_REF
10483 || code == TYPE_EXPR);
10486 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10487 errors are issued for invalid declarations. */
10490 grok_op_properties (tree decl, bool complain)
10492 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10494 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10495 tree name = DECL_NAME (decl);
10496 enum tree_code operator_code;
10501 /* Count the number of arguments and check for ellipsis. */
10502 for (argtype = argtypes, arity = 0;
10503 argtype && argtype != void_list_node;
10504 argtype = TREE_CHAIN (argtype))
10506 ellipsis_p = !argtype;
10508 class_type = DECL_CONTEXT (decl);
10509 if (class_type && !CLASS_TYPE_P (class_type))
10510 class_type = NULL_TREE;
10512 if (DECL_CONV_FN_P (decl))
10513 operator_code = TYPE_EXPR;
10517 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10518 if (ansi_opname (CODE) == name) \
10520 operator_code = (CODE); \
10523 else if (ansi_assopname (CODE) == name) \
10525 operator_code = (CODE); \
10526 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10530 #include "operators.def"
10531 #undef DEF_OPERATOR
10533 gcc_unreachable ();
10536 gcc_assert (operator_code != MAX_TREE_CODES);
10537 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10540 switch (operator_code)
10543 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10547 TYPE_GETS_DELETE (class_type) |= 1;
10551 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10554 case VEC_DELETE_EXPR:
10555 TYPE_GETS_DELETE (class_type) |= 2;
10562 /* [basic.std.dynamic.allocation]/1:
10564 A program is ill-formed if an allocation function is declared
10565 in a namespace scope other than global scope or declared static
10568 The same also holds true for deallocation functions. */
10569 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10570 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10572 if (DECL_NAMESPACE_SCOPE_P (decl))
10574 if (CP_DECL_CONTEXT (decl) != global_namespace)
10576 error ("%qD may not be declared within a namespace", decl);
10579 else if (!TREE_PUBLIC (decl))
10581 error ("%qD may not be declared as static", decl);
10587 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10589 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10590 DECL_IS_OPERATOR_NEW (decl) = 1;
10592 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10593 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10596 /* An operator function must either be a non-static member function
10597 or have at least one parameter of a class, a reference to a class,
10598 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10599 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10601 if (operator_code == TYPE_EXPR
10602 || operator_code == CALL_EXPR
10603 || operator_code == COMPONENT_REF
10604 || operator_code == ARRAY_REF
10605 || operator_code == NOP_EXPR)
10607 error ("%qD must be a nonstatic member function", decl);
10614 if (DECL_STATIC_FUNCTION_P (decl))
10616 error ("%qD must be either a non-static member "
10617 "function or a non-member function", decl);
10621 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10623 tree arg = non_reference (TREE_VALUE (p));
10624 if (arg == error_mark_node)
10627 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10628 because these checks are performed even on
10629 template functions. */
10630 if (MAYBE_CLASS_TYPE_P (arg)
10631 || TREE_CODE (arg) == ENUMERAL_TYPE)
10635 if (!p || p == void_list_node)
10638 error ("%qD must have an argument of class or "
10639 "enumerated type", decl);
10645 /* There are no restrictions on the arguments to an overloaded
10647 if (operator_code == CALL_EXPR)
10650 /* Warn about conversion operators that will never be used. */
10651 if (IDENTIFIER_TYPENAME_P (name)
10652 && ! DECL_TEMPLATE_INFO (decl)
10654 /* Warn only declaring the function; there is no need to
10655 warn again about out-of-class definitions. */
10656 && class_type == current_class_type)
10658 tree t = TREE_TYPE (name);
10659 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10662 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10664 if (TREE_CODE (t) == VOID_TYPE)
10665 warning (OPT_Wconversion,
10667 ? G_("conversion to a reference to void "
10668 "will never use a type conversion operator")
10669 : G_("conversion to void "
10670 "will never use a type conversion operator"));
10671 else if (class_type)
10673 if (t == class_type)
10674 warning (OPT_Wconversion,
10676 ? G_("conversion to a reference to the same type "
10677 "will never use a type conversion operator")
10678 : G_("conversion to the same type "
10679 "will never use a type conversion operator"));
10680 /* Don't force t to be complete here. */
10681 else if (MAYBE_CLASS_TYPE_P (t)
10682 && COMPLETE_TYPE_P (t)
10683 && DERIVED_FROM_P (t, class_type))
10684 warning (OPT_Wconversion,
10686 ? G_("conversion to a reference to a base class "
10687 "will never use a type conversion operator")
10688 : G_("conversion to a base class "
10689 "will never use a type conversion operator"));
10694 if (operator_code == COND_EXPR)
10697 error ("ISO C++ prohibits overloading operator ?:");
10700 else if (ellipsis_p)
10702 error ("%qD must not have variable number of arguments", decl);
10705 else if (ambi_op_p (operator_code))
10708 /* We pick the one-argument operator codes by default, so
10709 we don't have to change anything. */
10711 else if (arity == 2)
10713 /* If we thought this was a unary operator, we now know
10714 it to be a binary operator. */
10715 switch (operator_code)
10718 operator_code = MULT_EXPR;
10722 operator_code = BIT_AND_EXPR;
10725 case UNARY_PLUS_EXPR:
10726 operator_code = PLUS_EXPR;
10730 operator_code = MINUS_EXPR;
10733 case PREINCREMENT_EXPR:
10734 operator_code = POSTINCREMENT_EXPR;
10737 case PREDECREMENT_EXPR:
10738 operator_code = POSTDECREMENT_EXPR;
10742 gcc_unreachable ();
10745 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10747 if ((operator_code == POSTINCREMENT_EXPR
10748 || operator_code == POSTDECREMENT_EXPR)
10749 && ! processing_template_decl
10750 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10753 error ("postfix %qD must take %<int%> as its argument",
10756 error ("postfix %qD must take %<int%> as its second "
10764 error ("%qD must take either zero or one argument", decl);
10766 error ("%qD must take either one or two arguments", decl);
10770 /* More Effective C++ rule 6. */
10772 && (operator_code == POSTINCREMENT_EXPR
10773 || operator_code == POSTDECREMENT_EXPR
10774 || operator_code == PREINCREMENT_EXPR
10775 || operator_code == PREDECREMENT_EXPR))
10777 tree arg = TREE_VALUE (argtypes);
10778 tree ret = TREE_TYPE (TREE_TYPE (decl));
10779 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10780 arg = TREE_TYPE (arg);
10781 arg = TYPE_MAIN_VARIANT (arg);
10782 if (operator_code == PREINCREMENT_EXPR
10783 || operator_code == PREDECREMENT_EXPR)
10785 if (TREE_CODE (ret) != REFERENCE_TYPE
10786 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10788 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10789 build_reference_type (arg));
10793 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10794 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10798 else if (unary_op_p (operator_code))
10803 error ("%qD must take %<void%>", decl);
10805 error ("%qD must take exactly one argument", decl);
10809 else /* if (binary_op_p (operator_code)) */
10814 error ("%qD must take exactly one argument", decl);
10816 error ("%qD must take exactly two arguments", decl);
10820 /* More Effective C++ rule 7. */
10822 && (operator_code == TRUTH_ANDIF_EXPR
10823 || operator_code == TRUTH_ORIF_EXPR
10824 || operator_code == COMPOUND_EXPR))
10825 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10829 /* Effective C++ rule 23. */
10832 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10833 && (operator_code == PLUS_EXPR
10834 || operator_code == MINUS_EXPR
10835 || operator_code == TRUNC_DIV_EXPR
10836 || operator_code == MULT_EXPR
10837 || operator_code == TRUNC_MOD_EXPR)
10838 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10839 warning (OPT_Weffc__, "%qD should return by value", decl);
10841 /* [over.oper]/8 */
10842 for (; argtypes && argtypes != void_list_node;
10843 argtypes = TREE_CHAIN (argtypes))
10844 if (TREE_PURPOSE (argtypes))
10846 TREE_PURPOSE (argtypes) = NULL_TREE;
10847 if (operator_code == POSTINCREMENT_EXPR
10848 || operator_code == POSTDECREMENT_EXPR)
10850 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10855 error ("%qD cannot have default arguments", decl);
10863 /* Return a string giving the keyword associate with CODE. */
10865 static const char *
10866 tag_name (enum tag_types code)
10878 case typename_type:
10881 gcc_unreachable ();
10885 /* Name lookup in an elaborated-type-specifier (after the keyword
10886 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10887 elaborated-type-specifier is invalid, issue a diagnostic and return
10888 error_mark_node; otherwise, return the *_TYPE to which it referred.
10889 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10892 check_elaborated_type_specifier (enum tag_types tag_code,
10894 bool allow_template_p)
10900 struct S { struct S *p; };
10902 name lookup will find the TYPE_DECL for the implicit "S::S"
10903 typedef. Adjust for that here. */
10904 if (DECL_SELF_REFERENCE_P (decl))
10905 decl = TYPE_NAME (TREE_TYPE (decl));
10907 type = TREE_TYPE (decl);
10909 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10910 is false for this case as well. */
10911 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10913 error ("using template type parameter %qT after %qs",
10914 type, tag_name (tag_code));
10915 return error_mark_node;
10919 If the identifier resolves to a typedef-name or a template
10920 type-parameter, the elaborated-type-specifier is ill-formed.
10922 In other words, the only legitimate declaration to use in the
10923 elaborated type specifier is the implicit typedef created when
10924 the type is declared. */
10925 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10926 && !DECL_SELF_REFERENCE_P (decl)
10927 && tag_code != typename_type)
10929 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10930 error ("%q+D has a previous declaration here", decl);
10931 return error_mark_node;
10933 else if (TREE_CODE (type) != RECORD_TYPE
10934 && TREE_CODE (type) != UNION_TYPE
10935 && tag_code != enum_type
10936 && tag_code != typename_type)
10938 error ("%qT referred to as %qs", type, tag_name (tag_code));
10939 error ("%q+T has a previous declaration here", type);
10940 return error_mark_node;
10942 else if (TREE_CODE (type) != ENUMERAL_TYPE
10943 && tag_code == enum_type)
10945 error ("%qT referred to as enum", type);
10946 error ("%q+T has a previous declaration here", type);
10947 return error_mark_node;
10949 else if (!allow_template_p
10950 && TREE_CODE (type) == RECORD_TYPE
10951 && CLASSTYPE_IS_TEMPLATE (type))
10953 /* If a class template appears as elaborated type specifier
10954 without a template header such as:
10956 template <class T> class C {};
10957 void f(class C); // No template header here
10959 then the required template argument is missing. */
10960 error ("template argument required for %<%s %T%>",
10961 tag_name (tag_code),
10962 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10963 return error_mark_node;
10969 /* Lookup NAME in elaborate type specifier in scope according to
10970 SCOPE and issue diagnostics if necessary.
10971 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10972 found, and ERROR_MARK_NODE for type error. */
10975 lookup_and_check_tag (enum tag_types tag_code, tree name,
10976 tag_scope scope, bool template_header_p)
10980 if (scope == ts_global)
10982 /* First try ordinary name lookup, ignoring hidden class name
10983 injected via friend declaration. */
10984 decl = lookup_name_prefer_type (name, 2);
10985 /* If that fails, the name will be placed in the smallest
10986 non-class, non-function-prototype scope according to 3.3.1/5.
10987 We may already have a hidden name declared as friend in this
10988 scope. So lookup again but not ignoring hidden names.
10989 If we find one, that name will be made visible rather than
10990 creating a new tag. */
10992 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10995 decl = lookup_type_scope (name, scope);
10997 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10998 decl = DECL_TEMPLATE_RESULT (decl);
11000 if (decl && TREE_CODE (decl) == TYPE_DECL)
11002 /* Look for invalid nested type:
11006 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11008 error ("%qD has the same name as the class in which it is "
11011 return error_mark_node;
11014 /* Two cases we need to consider when deciding if a class
11015 template is allowed as an elaborated type specifier:
11016 1. It is a self reference to its own class.
11017 2. It comes with a template header.
11021 template <class T> class C {
11022 class C *c1; // DECL_SELF_REFERENCE_P is true
11025 template <class U> class C; // template_header_p is true
11026 template <class T> class C<T>::D {
11027 class C *c2; // DECL_SELF_REFERENCE_P is true
11030 t = check_elaborated_type_specifier (tag_code,
11033 | DECL_SELF_REFERENCE_P (decl));
11036 else if (decl && TREE_CODE (decl) == TREE_LIST)
11038 error ("reference to %qD is ambiguous", name);
11039 print_candidates (decl);
11040 return error_mark_node;
11046 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11047 Define the tag as a forward-reference if it is not defined.
11049 If a declaration is given, process it here, and report an error if
11050 multiple declarations are not identical.
11052 SCOPE is TS_CURRENT when this is also a definition. Only look in
11053 the current frame for the name (since C++ allows new names in any
11054 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11055 declaration. Only look beginning from the current scope outward up
11056 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11058 TEMPLATE_HEADER_P is true when this declaration is preceded by
11059 a set of template parameters. */
11062 xref_tag (enum tag_types tag_code, tree name,
11063 tag_scope scope, bool template_header_p)
11065 enum tree_code code;
11067 tree context = NULL_TREE;
11069 timevar_push (TV_NAME_LOOKUP);
11071 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11077 code = RECORD_TYPE;
11083 code = ENUMERAL_TYPE;
11086 gcc_unreachable ();
11089 /* In case of anonymous name, xref_tag is only called to
11090 make type node and push name. Name lookup is not required. */
11091 if (ANON_AGGRNAME_P (name))
11094 t = lookup_and_check_tag (tag_code, name,
11095 scope, template_header_p);
11097 if (t == error_mark_node)
11098 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11100 if (scope != ts_current && t && current_class_type
11101 && template_class_depth (current_class_type)
11102 && template_header_p)
11104 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11105 definition of this tag. Since, in addition, we are currently
11106 processing a (member) template declaration of a template
11107 class, we must be very careful; consider:
11114 { template <class V>
11115 friend struct S1; };
11117 Here, the S2::S1 declaration should not be confused with the
11118 outer declaration. In particular, the inner version should
11119 have a template parameter of level 2, not level 1. This
11120 would be particularly important if the member declaration
11123 template <class V = U> friend struct S1;
11125 say, when we should tsubst into `U' when instantiating
11126 S2. On the other hand, when presented with:
11136 we must find the inner binding eventually. We
11137 accomplish this by making sure that the new type we
11138 create to represent this declaration has the right
11140 context = TYPE_CONTEXT (t);
11146 /* If no such tag is yet defined, create a forward-reference node
11147 and record it as the "definition".
11148 When a real declaration of this type is found,
11149 the forward-reference will be altered into a real type. */
11150 if (code == ENUMERAL_TYPE)
11152 error ("use of enum %q#D without previous declaration", name);
11153 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11157 t = make_class_type (code);
11158 TYPE_CONTEXT (t) = context;
11159 t = pushtag (name, t, scope);
11164 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11166 if (!redeclare_class_template (t, current_template_parms))
11167 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11169 else if (!processing_template_decl
11170 && CLASS_TYPE_P (t)
11171 && CLASSTYPE_IS_TEMPLATE (t))
11173 error ("redeclaration of %qT as a non-template", t);
11174 error ("previous declaration %q+D", t);
11175 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11178 /* Make injected friend class visible. */
11179 if (scope != ts_within_enclosing_non_class
11180 && hidden_name_p (TYPE_NAME (t)))
11182 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11183 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11185 if (TYPE_TEMPLATE_INFO (t))
11187 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11188 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11193 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11197 xref_tag_from_type (tree old, tree id, tag_scope scope)
11199 enum tag_types tag_kind;
11201 if (TREE_CODE (old) == RECORD_TYPE)
11202 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11204 tag_kind = union_type;
11206 if (id == NULL_TREE)
11207 id = TYPE_IDENTIFIER (old);
11209 return xref_tag (tag_kind, id, scope, false);
11212 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11213 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11214 access_* node, and the TREE_VALUE is the type of the base-class.
11215 Non-NULL TREE_TYPE indicates virtual inheritance.
11217 Returns true if the binfo hierarchy was successfully created,
11218 false if an error was detected. */
11221 xref_basetypes (tree ref, tree base_list)
11224 tree binfo, base_binfo;
11225 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11226 unsigned max_bases = 0; /* Maximum direct bases. */
11228 tree default_access;
11229 tree igo_prev; /* Track Inheritance Graph Order. */
11231 if (ref == error_mark_node)
11234 /* The base of a derived class is private by default, all others are
11236 default_access = (TREE_CODE (ref) == RECORD_TYPE
11237 && CLASSTYPE_DECLARED_CLASS (ref)
11238 ? access_private_node : access_public_node);
11240 /* First, make sure that any templates in base-classes are
11241 instantiated. This ensures that if we call ourselves recursively
11242 we do not get confused about which classes are marked and which
11244 basep = &base_list;
11247 tree basetype = TREE_VALUE (*basep);
11249 if (!(processing_template_decl && uses_template_parms (basetype))
11250 && !complete_type_or_else (basetype, NULL))
11251 /* An incomplete type. Remove it from the list. */
11252 *basep = TREE_CHAIN (*basep);
11256 if (TREE_TYPE (*basep))
11258 if (CLASS_TYPE_P (basetype))
11259 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11260 basep = &TREE_CHAIN (*basep);
11264 TYPE_MARKED_P (ref) = 1;
11266 /* The binfo slot should be empty, unless this is an (ill-formed)
11268 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11270 error ("redefinition of %q#T", ref);
11274 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11276 binfo = make_tree_binfo (max_bases);
11278 TYPE_BINFO (ref) = binfo;
11279 BINFO_OFFSET (binfo) = size_zero_node;
11280 BINFO_TYPE (binfo) = ref;
11282 /* Apply base-class info set up to the variants of this type. */
11283 fixup_type_variants (ref);
11287 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11288 /* An aggregate cannot have baseclasses. */
11289 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11291 if (TREE_CODE (ref) == UNION_TYPE)
11293 error ("derived union %qT invalid", ref);
11300 if (TYPE_FOR_JAVA (ref))
11302 error ("Java class %qT cannot have multiple bases", ref);
11309 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11311 if (TYPE_FOR_JAVA (ref))
11313 error ("Java class %qT cannot have virtual bases", ref);
11318 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11320 tree access = TREE_PURPOSE (base_list);
11321 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11322 tree basetype = TREE_VALUE (base_list);
11324 if (access == access_default_node)
11325 access = default_access;
11327 if (PACK_EXPANSION_P (basetype))
11328 basetype = PACK_EXPANSION_PATTERN (basetype);
11329 if (TREE_CODE (basetype) == TYPE_DECL)
11330 basetype = TREE_TYPE (basetype);
11331 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11333 error ("base type %qT fails to be a struct or class type",
11338 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11339 TYPE_FOR_JAVA (ref) = 1;
11341 base_binfo = NULL_TREE;
11342 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11344 base_binfo = TYPE_BINFO (basetype);
11345 /* The original basetype could have been a typedef'd type. */
11346 basetype = BINFO_TYPE (base_binfo);
11348 /* Inherit flags from the base. */
11349 TYPE_HAS_NEW_OPERATOR (ref)
11350 |= TYPE_HAS_NEW_OPERATOR (basetype);
11351 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11352 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11353 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11354 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11355 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11356 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11357 CLASSTYPE_REPEATED_BASE_P (ref)
11358 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11361 /* We must do this test after we've seen through a typedef
11363 if (TYPE_MARKED_P (basetype))
11365 if (basetype == ref)
11366 error ("recursive type %qT undefined", basetype);
11368 error ("duplicate base type %qT invalid", basetype);
11372 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11373 /* Regenerate the pack expansion for the bases. */
11374 basetype = make_pack_expansion (basetype);
11376 TYPE_MARKED_P (basetype) = 1;
11378 base_binfo = copy_binfo (base_binfo, basetype, ref,
11379 &igo_prev, via_virtual);
11380 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11381 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11383 BINFO_BASE_APPEND (binfo, base_binfo);
11384 BINFO_BASE_ACCESS_APPEND (binfo, access);
11387 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11388 /* If we have space in the vbase vector, we must have shared at
11389 least one of them, and are therefore diamond shaped. */
11390 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11392 /* Unmark all the types. */
11393 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11394 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11395 TYPE_MARKED_P (ref) = 0;
11397 /* Now see if we have a repeated base type. */
11398 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11400 for (base_binfo = binfo; base_binfo;
11401 base_binfo = TREE_CHAIN (base_binfo))
11403 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11405 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11408 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11410 for (base_binfo = binfo; base_binfo;
11411 base_binfo = TREE_CHAIN (base_binfo))
11412 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11413 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11422 /* Copies the enum-related properties from type SRC to type DST.
11423 Used with the underlying type of an enum and the enum itself. */
11425 copy_type_enum (tree dst, tree src)
11427 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11428 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11429 TYPE_SIZE (dst) = TYPE_SIZE (src);
11430 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11431 SET_TYPE_MODE (dst, TYPE_MODE (src));
11432 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11433 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11434 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11435 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11438 /* Begin compiling the definition of an enumeration type.
11441 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11443 UNDERLYING_TYPE is the type that will be used as the storage for
11444 the enumeration type. This should be NULL_TREE if no storage type
11447 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11449 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11451 Returns the type object, as yet incomplete.
11452 Also records info about it so that build_enumerator
11453 may be used to declare the individual values as they are read. */
11456 start_enum (tree name, tree enumtype, tree underlying_type,
11457 bool scoped_enum_p, bool *is_new)
11459 tree prevtype = NULL_TREE;
11460 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11464 /* [C++0x dcl.enum]p5:
11466 If not explicitly specified, the underlying type of a scoped
11467 enumeration type is int. */
11468 if (!underlying_type && scoped_enum_p)
11469 underlying_type = integer_type_node;
11471 if (underlying_type)
11472 underlying_type = cv_unqualified (underlying_type);
11474 /* If this is the real definition for a previous forward reference,
11475 fill in the contents in the same object that used to be the
11476 forward reference. */
11478 enumtype = lookup_and_check_tag (enum_type, name,
11479 /*tag_scope=*/ts_current,
11480 /*template_header_p=*/false);
11482 /* In case of a template_decl, the only check that should be deferred
11483 to instantiation time is the comparison of underlying types. */
11484 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11486 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11488 error_at (input_location, "scoped/unscoped mismatch "
11489 "in enum %q#T", enumtype);
11490 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11491 "previous definition here");
11492 enumtype = error_mark_node;
11494 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11496 error_at (input_location, "underlying type mismatch "
11497 "in enum %q#T", enumtype);
11498 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11499 "previous definition here");
11500 enumtype = error_mark_node;
11502 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11503 && !dependent_type_p (underlying_type)
11504 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11505 && !same_type_p (underlying_type,
11506 ENUM_UNDERLYING_TYPE (enumtype)))
11508 error_at (input_location, "different underlying type "
11509 "in enum %q#T", enumtype);
11510 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11511 "previous definition here");
11512 underlying_type = NULL_TREE;
11516 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11517 || processing_template_decl)
11519 /* In case of error, make a dummy enum to allow parsing to
11521 if (enumtype == error_mark_node)
11523 name = make_anon_name ();
11524 enumtype = NULL_TREE;
11527 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11528 of an opaque enum, or an opaque enum of an already defined
11529 enumeration (C++0x only).
11530 In any other case, it'll be NULL_TREE. */
11536 prevtype = enumtype;
11537 enumtype = cxx_make_type (ENUMERAL_TYPE);
11538 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11539 if (enumtype == error_mark_node)
11540 return error_mark_node;
11542 /* The enum is considered opaque until the opening '{' of the
11543 enumerator list. */
11544 SET_OPAQUE_ENUM_P (enumtype, true);
11545 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11548 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11550 if (underlying_type)
11552 if (CP_INTEGRAL_TYPE_P (underlying_type))
11554 copy_type_enum (enumtype, underlying_type);
11555 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11557 else if (dependent_type_p (underlying_type))
11558 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11560 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11561 underlying_type, enumtype);
11564 /* If into a template class, the returned enum is always the first
11565 declaration (opaque or not) seen. This way all the references to
11566 this type will be to the same declaration. The following ones are used
11567 only to check for definition errors. */
11568 if (prevtype && processing_template_decl)
11574 /* After processing and defining all the values of an enumeration type,
11575 install their decls in the enumeration type.
11576 ENUMTYPE is the type object. */
11579 finish_enum_value_list (tree enumtype)
11582 tree underlying_type;
11585 tree minnode, maxnode;
11588 bool fixed_underlying_type_p
11589 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11591 /* We built up the VALUES in reverse order. */
11592 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11594 /* For an enum defined in a template, just set the type of the values;
11595 all further processing is postponed until the template is
11596 instantiated. We need to set the type so that tsubst of a CONST_DECL
11598 if (processing_template_decl)
11600 for (values = TYPE_VALUES (enumtype);
11602 values = TREE_CHAIN (values))
11603 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11607 /* Determine the minimum and maximum values of the enumerators. */
11608 if (TYPE_VALUES (enumtype))
11610 minnode = maxnode = NULL_TREE;
11612 for (values = TYPE_VALUES (enumtype);
11614 values = TREE_CHAIN (values))
11616 decl = TREE_VALUE (values);
11618 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11619 each enumerator has the type of its enumeration. Prior to the
11620 closing brace, the type of each enumerator is the type of its
11621 initializing value. */
11622 TREE_TYPE (decl) = enumtype;
11624 /* Update the minimum and maximum values, if appropriate. */
11625 value = DECL_INITIAL (decl);
11626 if (value == error_mark_node)
11627 value = integer_zero_node;
11628 /* Figure out what the minimum and maximum values of the
11629 enumerators are. */
11631 minnode = maxnode = value;
11632 else if (tree_int_cst_lt (maxnode, value))
11634 else if (tree_int_cst_lt (value, minnode))
11641 If the enumerator-list is empty, the underlying type is as if
11642 the enumeration had a single enumerator with value 0. */
11643 minnode = maxnode = integer_zero_node;
11645 if (!fixed_underlying_type_p)
11647 /* Compute the number of bits require to represent all values of the
11648 enumeration. We must do this before the type of MINNODE and
11649 MAXNODE are transformed, since tree_int_cst_min_precision relies
11650 on the TREE_TYPE of the value it is passed. */
11651 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11652 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11653 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11654 int precision = MAX (lowprec, highprec);
11656 bool use_short_enum;
11658 /* Determine the underlying type of the enumeration.
11662 The underlying type of an enumeration is an integral type that
11663 can represent all the enumerator values defined in the
11664 enumeration. It is implementation-defined which integral type is
11665 used as the underlying type for an enumeration except that the
11666 underlying type shall not be larger than int unless the value of
11667 an enumerator cannot fit in an int or unsigned int.
11669 We use "int" or an "unsigned int" as the underlying type, even if
11670 a smaller integral type would work, unless the user has
11671 explicitly requested that we use the smallest possible type. The
11672 user can request that for all enumerations with a command line
11673 flag, or for just one enumeration with an attribute. */
11675 use_short_enum = flag_short_enums
11676 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11678 for (itk = (use_short_enum ? itk_char : itk_int);
11682 underlying_type = integer_types[itk];
11683 if (underlying_type != NULL_TREE
11684 && TYPE_PRECISION (underlying_type) >= precision
11685 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11688 if (itk == itk_none)
11692 IF no integral type can represent all the enumerator values, the
11693 enumeration is ill-formed. */
11694 error ("no integral type can represent all of the enumerator values "
11695 "for %qT", enumtype);
11696 precision = TYPE_PRECISION (long_long_integer_type_node);
11697 underlying_type = integer_types[itk_unsigned_long_long];
11702 The value of sizeof() applied to an enumeration type, an object
11703 of an enumeration type, or an enumerator, is the value of sizeof()
11704 applied to the underlying type. */
11705 copy_type_enum (enumtype, underlying_type);
11707 /* Compute the minimum and maximum values for the type.
11711 For an enumeration where emin is the smallest enumerator and emax
11712 is the largest, the values of the enumeration are the values of the
11713 underlying type in the range bmin to bmax, where bmin and bmax are,
11714 respectively, the smallest and largest values of the smallest bit-
11715 field that can store emin and emax. */
11717 /* The middle-end currently assumes that types with TYPE_PRECISION
11718 narrower than their underlying type are suitably zero or sign
11719 extended to fill their mode. Similarly, it assumes that the front
11720 end assures that a value of a particular type must be within
11721 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11723 We used to set these fields based on bmin and bmax, but that led
11724 to invalid assumptions like optimizing away bounds checking. So
11725 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11726 TYPE_MAX_VALUE to the values for the mode above and only restrict
11727 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11728 ENUM_UNDERLYING_TYPE (enumtype)
11729 = build_distinct_type_copy (underlying_type);
11730 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11731 set_min_and_max_values_for_integral_type
11732 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11734 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11735 if (flag_strict_enums)
11736 set_min_and_max_values_for_integral_type (enumtype, precision,
11740 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11742 /* Convert each of the enumerators to the type of the underlying
11743 type of the enumeration. */
11744 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11746 location_t saved_location;
11748 decl = TREE_VALUE (values);
11749 saved_location = input_location;
11750 input_location = DECL_SOURCE_LOCATION (decl);
11751 if (fixed_underlying_type_p)
11752 /* If the enumeration type has a fixed underlying type, we
11753 already checked all of the enumerator values. */
11754 value = DECL_INITIAL (decl);
11756 value = perform_implicit_conversion (underlying_type,
11757 DECL_INITIAL (decl),
11758 tf_warning_or_error);
11759 input_location = saved_location;
11761 /* Do not clobber shared ints. */
11762 value = copy_node (value);
11764 TREE_TYPE (value) = enumtype;
11765 DECL_INITIAL (decl) = value;
11768 /* Fix up all variant types of this enum type. */
11769 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11770 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11772 /* Finish debugging output for this type. */
11773 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11776 /* Finishes the enum type. This is called only the first time an
11777 enumeration is seen, be it opaque or odinary.
11778 ENUMTYPE is the type object. */
11781 finish_enum (tree enumtype)
11783 if (processing_template_decl)
11785 if (at_function_scope_p ())
11786 add_stmt (build_min (TAG_DEFN, enumtype));
11790 /* Here there should not be any variants of this type. */
11791 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11792 && !TYPE_NEXT_VARIANT (enumtype));
11795 /* Build and install a CONST_DECL for an enumeration constant of the
11796 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11797 LOC is the location of NAME.
11798 Assignment of sequential values by default is handled here. */
11801 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11807 /* If the VALUE was erroneous, pretend it wasn't there; that will
11808 result in the enum being assigned the next value in sequence. */
11809 if (value == error_mark_node)
11812 /* Remove no-op casts from the value. */
11814 STRIP_TYPE_NOPS (value);
11816 if (! processing_template_decl)
11818 /* Validate and default VALUE. */
11819 if (value != NULL_TREE)
11821 value = cxx_constant_value (value);
11823 if (TREE_CODE (value) == INTEGER_CST)
11825 value = perform_integral_promotions (value);
11826 constant_expression_warning (value);
11830 error ("enumerator value for %qD is not an integer constant", name);
11835 /* Default based on previous value. */
11836 if (value == NULL_TREE)
11838 if (TYPE_VALUES (enumtype))
11841 unsigned HOST_WIDE_INT lo;
11845 /* The next value is the previous value plus one.
11846 add_double doesn't know the type of the target expression,
11847 so we must check with int_fits_type_p as well. */
11848 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11849 if (error_operand_p (prev_value))
11850 value = error_mark_node;
11853 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11854 TREE_INT_CST_HIGH (prev_value),
11856 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11858 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11862 error ("overflow in enumeration values at %qD", name);
11863 value = error_mark_node;
11868 value = integer_zero_node;
11871 /* Remove no-op casts from the value. */
11872 STRIP_TYPE_NOPS (value);
11874 /* If the underlying type of the enum is fixed, check whether
11875 the enumerator values fits in the underlying type. If it
11876 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11877 if (ENUM_UNDERLYING_TYPE (enumtype)
11879 && TREE_CODE (value) == INTEGER_CST
11880 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11882 error ("enumerator value %E is too large for underlying type %<%T%>",
11883 value, ENUM_UNDERLYING_TYPE (enumtype));
11885 /* Silently convert the value so that we can continue. */
11886 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11891 /* C++ associates enums with global, function, or class declarations. */
11892 context = current_scope ();
11894 /* Build the actual enumeration constant. Note that the enumeration
11895 constants have the underlying type of the enum (if it is fixed)
11896 or the type of their initializer (if the underlying type of the
11897 enum is not fixed):
11901 If the underlying type is fixed, the type of each enumerator
11902 prior to the closing brace is the underlying type; if the
11903 initializing value of an enumerator cannot be represented by
11904 the underlying type, the program is ill-formed. If the
11905 underlying type is not fixed, the type of each enumerator is
11906 the type of its initializing value.
11908 If the underlying type is not fixed, it will be computed by
11909 finish_enum and we will reset the type of this enumerator. Of
11910 course, if we're processing a template, there may be no value. */
11911 type = value ? TREE_TYPE (value) : NULL_TREE;
11913 if (context && context == current_class_type)
11914 /* This enum declaration is local to the class. We need the full
11915 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11916 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11918 /* It's a global enum, or it's local to a function. (Note local to
11919 a function could mean local to a class method. */
11920 decl = build_decl (loc, CONST_DECL, name, type);
11922 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11923 TREE_CONSTANT (decl) = 1;
11924 TREE_READONLY (decl) = 1;
11925 DECL_INITIAL (decl) = value;
11927 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11928 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11929 on the TYPE_FIELDS list for `S'. (That's so that you can say
11930 things like `S::i' later.) */
11931 finish_member_declaration (decl);
11935 /* Add this enumeration constant to the list for this type. */
11936 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11939 /* Look for an enumerator with the given NAME within the enumeration
11940 type ENUMTYPE. This routine is used primarily for qualified name
11941 lookup into an enumerator in C++0x, e.g.,
11943 enum class Color { Red, Green, Blue };
11945 Color color = Color::Red;
11947 Returns the value corresponding to the enumerator, or
11948 NULL_TREE if no such enumerator was found. */
11950 lookup_enumerator (tree enumtype, tree name)
11953 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11955 e = purpose_member (name, TYPE_VALUES (enumtype));
11956 return e? TREE_VALUE (e) : NULL_TREE;
11960 /* We're defining DECL. Make sure that its type is OK. */
11963 check_function_type (tree decl, tree current_function_parms)
11965 tree fntype = TREE_TYPE (decl);
11966 tree return_type = complete_type (TREE_TYPE (fntype));
11968 /* In a function definition, arg types must be complete. */
11969 require_complete_types_for_parms (current_function_parms);
11971 if (dependent_type_p (return_type))
11973 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11974 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11976 tree args = TYPE_ARG_TYPES (fntype);
11978 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11979 error ("return type %q#T is incomplete", return_type);
11981 error ("return type has Java class type %q#T", return_type);
11983 /* Make it return void instead. */
11984 if (TREE_CODE (fntype) == METHOD_TYPE)
11985 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11987 TREE_CHAIN (args));
11989 fntype = build_function_type (void_type_node, args);
11991 = build_exception_variant (fntype,
11992 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11993 fntype = (cp_build_type_attribute_variant
11994 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11995 TREE_TYPE (decl) = fntype;
11998 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12001 /* Create the FUNCTION_DECL for a function definition.
12002 DECLSPECS and DECLARATOR are the parts of the declaration;
12003 they describe the function's name and the type it returns,
12004 but twisted together in a fashion that parallels the syntax of C.
12006 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12007 DECLARATOR is really the DECL for the function we are about to
12008 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12009 indicating that the function is an inline defined in-class.
12011 This function creates a binding context for the function body
12012 as well as setting up the FUNCTION_DECL in current_function_decl.
12014 For C++, we must first check whether that datum makes any sense.
12015 For example, "class A local_a(1,2);" means that variable local_a
12016 is an aggregate of type A, which should have a constructor
12017 applied to it with the argument list [1, 2].
12019 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12020 or may be a BLOCK if the function has been defined previously
12021 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12022 error_mark_node if the function has never been defined, or
12023 a BLOCK if the function has been defined somewhere. */
12026 start_preparsed_function (tree decl1, tree attrs, int flags)
12028 tree ctype = NULL_TREE;
12031 int doing_friend = 0;
12032 struct cp_binding_level *bl;
12033 tree current_function_parms;
12034 struct c_fileinfo *finfo
12035 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12036 bool honor_interface;
12038 /* Sanity check. */
12039 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12040 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12042 fntype = TREE_TYPE (decl1);
12043 if (TREE_CODE (fntype) == METHOD_TYPE)
12044 ctype = TYPE_METHOD_BASETYPE (fntype);
12046 /* ISO C++ 11.4/5. A friend function defined in a class is in
12047 the (lexical) scope of the class in which it is defined. */
12048 if (!ctype && DECL_FRIEND_P (decl1))
12050 ctype = DECL_FRIEND_CONTEXT (decl1);
12052 /* CTYPE could be null here if we're dealing with a template;
12053 for example, `inline friend float foo()' inside a template
12054 will have no CTYPE set. */
12055 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12061 if (DECL_DECLARED_INLINE_P (decl1)
12062 && lookup_attribute ("noinline", attrs))
12063 warning (0, "inline function %q+D given attribute noinline", decl1);
12065 /* Handle gnu_inline attribute. */
12066 if (GNU_INLINE_P (decl1))
12068 DECL_EXTERNAL (decl1) = 1;
12069 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12070 DECL_INTERFACE_KNOWN (decl1) = 1;
12071 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12074 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12075 /* This is a constructor, we must ensure that any default args
12076 introduced by this definition are propagated to the clones
12077 now. The clones are used directly in overload resolution. */
12078 adjust_clone_args (decl1);
12080 /* Sometimes we don't notice that a function is a static member, and
12081 build a METHOD_TYPE for it. Fix that up now. */
12082 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12083 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12085 revert_static_member_fn (decl1);
12089 /* Set up current_class_type, and enter the scope of the class, if
12092 push_nested_class (ctype);
12093 else if (DECL_STATIC_FUNCTION_P (decl1))
12094 push_nested_class (DECL_CONTEXT (decl1));
12096 /* Now that we have entered the scope of the class, we must restore
12097 the bindings for any template parameters surrounding DECL1, if it
12098 is an inline member template. (Order is important; consider the
12099 case where a template parameter has the same name as a field of
12100 the class.) It is not until after this point that
12101 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12102 if (flags & SF_INCLASS_INLINE)
12103 maybe_begin_member_template_processing (decl1);
12105 /* Effective C++ rule 15. */
12107 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12108 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12109 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12111 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12112 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12113 if (!DECL_INITIAL (decl1))
12114 DECL_INITIAL (decl1) = error_mark_node;
12116 /* This function exists in static storage.
12117 (This does not mean `static' in the C sense!) */
12118 TREE_STATIC (decl1) = 1;
12120 /* We must call push_template_decl after current_class_type is set
12121 up. (If we are processing inline definitions after exiting a
12122 class scope, current_class_type will be NULL_TREE until set above
12123 by push_nested_class.) */
12124 if (processing_template_decl)
12126 /* FIXME: Handle error_mark_node more gracefully. */
12127 tree newdecl1 = push_template_decl (decl1);
12128 if (newdecl1 != error_mark_node)
12132 /* We are now in the scope of the function being defined. */
12133 current_function_decl = decl1;
12135 /* Save the parm names or decls from this function's declarator
12136 where store_parm_decls will find them. */
12137 current_function_parms = DECL_ARGUMENTS (decl1);
12139 /* Make sure the parameter and return types are reasonable. When
12140 you declare a function, these types can be incomplete, but they
12141 must be complete when you define the function. */
12142 check_function_type (decl1, current_function_parms);
12144 /* Build the return declaration for the function. */
12145 restype = TREE_TYPE (fntype);
12146 if (DECL_RESULT (decl1) == NULL_TREE)
12150 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12151 DECL_ARTIFICIAL (resdecl) = 1;
12152 DECL_IGNORED_P (resdecl) = 1;
12153 DECL_RESULT (decl1) = resdecl;
12155 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12158 /* Let the user know we're compiling this function. */
12159 announce_function (decl1);
12161 /* Record the decl so that the function name is defined.
12162 If we already have a decl for this name, and it is a FUNCTION_DECL,
12163 use the old decl. */
12164 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12166 /* A specialization is not used to guide overload resolution. */
12167 if (!DECL_FUNCTION_MEMBER_P (decl1)
12168 && !(DECL_USE_TEMPLATE (decl1) &&
12169 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12171 tree olddecl = pushdecl (decl1);
12173 if (olddecl == error_mark_node)
12174 /* If something went wrong when registering the declaration,
12175 use DECL1; we have to have a FUNCTION_DECL to use when
12176 parsing the body of the function. */
12180 /* Otherwise, OLDDECL is either a previous declaration
12181 of the same function or DECL1 itself. */
12183 if (warn_missing_declarations
12184 && olddecl == decl1
12185 && !DECL_MAIN_P (decl1)
12186 && TREE_PUBLIC (decl1)
12187 && !DECL_DECLARED_INLINE_P (decl1))
12191 /* Check whether DECL1 is in an anonymous
12193 for (context = DECL_CONTEXT (decl1);
12195 context = DECL_CONTEXT (context))
12197 if (TREE_CODE (context) == NAMESPACE_DECL
12198 && DECL_NAME (context) == NULL_TREE)
12202 if (context == NULL)
12203 warning (OPT_Wmissing_declarations,
12204 "no previous declaration for %q+D", decl1);
12212 /* We need to set the DECL_CONTEXT. */
12213 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12214 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12216 fntype = TREE_TYPE (decl1);
12218 /* If #pragma weak applies, mark the decl appropriately now.
12219 The pragma only applies to global functions. Because
12220 determining whether or not the #pragma applies involves
12221 computing the mangled name for the declaration, we cannot
12222 apply the pragma until after we have merged this declaration
12223 with any previous declarations; if the original declaration
12224 has a linkage specification, that specification applies to
12225 the definition as well, and may affect the mangled name. */
12226 if (DECL_FILE_SCOPE_P (decl1))
12227 maybe_apply_pragma_weak (decl1);
12230 /* constexpr functions must have literal argument types and
12231 literal return type. */
12232 validate_constexpr_fundecl (decl1);
12234 /* Reset this in case the call to pushdecl changed it. */
12235 current_function_decl = decl1;
12237 gcc_assert (DECL_INITIAL (decl1));
12239 /* This function may already have been parsed, in which case just
12240 return; our caller will skip over the body without parsing. */
12241 if (DECL_INITIAL (decl1) != error_mark_node)
12244 /* Initialize RTL machinery. We cannot do this until
12245 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12246 even when processing a template; this is how we get
12247 CFUN set up, and our per-function variables initialized.
12248 FIXME factor out the non-RTL stuff. */
12249 bl = current_binding_level;
12250 allocate_struct_function (decl1, processing_template_decl);
12252 /* Initialize the language data structures. Whenever we start
12253 a new function, we destroy temporaries in the usual way. */
12254 cfun->language = ggc_alloc_cleared_language_function ();
12255 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12256 current_binding_level = bl;
12258 /* Even though we're inside a function body, we still don't want to
12259 call expand_expr to calculate the size of a variable-sized array.
12260 We haven't necessarily assigned RTL to all variables yet, so it's
12261 not safe to try to expand expressions involving them. */
12262 cfun->dont_save_pending_sizes_p = 1;
12264 /* Start the statement-tree, start the tree now. */
12265 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12267 /* If we are (erroneously) defining a function that we have already
12268 defined before, wipe out what we knew before. */
12269 if (!DECL_PENDING_INLINE_P (decl1))
12270 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12272 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12274 /* We know that this was set up by `grokclassfn'. We do not
12275 wait until `store_parm_decls', since evil parse errors may
12276 never get us to that point. Here we keep the consistency
12277 between `current_class_type' and `current_class_ptr'. */
12278 tree t = DECL_ARGUMENTS (decl1);
12280 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12281 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12283 cp_function_chain->x_current_class_ref
12284 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12285 cp_function_chain->x_current_class_ptr = t;
12287 /* Constructors and destructors need to know whether they're "in
12288 charge" of initializing virtual base classes. */
12289 t = DECL_CHAIN (t);
12290 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12292 current_in_charge_parm = t;
12293 t = DECL_CHAIN (t);
12295 if (DECL_HAS_VTT_PARM_P (decl1))
12297 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12298 current_vtt_parm = t;
12302 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12303 /* Implicitly-defined methods (like the
12304 destructor for a class in which no destructor
12305 is explicitly declared) must not be defined
12306 until their definition is needed. So, we
12307 ignore interface specifications for
12308 compiler-generated functions. */
12309 && !DECL_ARTIFICIAL (decl1));
12311 if (DECL_INTERFACE_KNOWN (decl1))
12313 tree ctx = decl_function_context (decl1);
12315 if (DECL_NOT_REALLY_EXTERN (decl1))
12316 DECL_EXTERNAL (decl1) = 0;
12318 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12319 && TREE_PUBLIC (ctx))
12320 /* This is a function in a local class in an extern inline
12322 comdat_linkage (decl1);
12324 /* If this function belongs to an interface, it is public.
12325 If it belongs to someone else's interface, it is also external.
12326 This only affects inlines and template instantiations. */
12327 else if (!finfo->interface_unknown && honor_interface)
12329 if (DECL_DECLARED_INLINE_P (decl1)
12330 || DECL_TEMPLATE_INSTANTIATION (decl1)
12331 || processing_template_decl)
12333 DECL_EXTERNAL (decl1)
12334 = (finfo->interface_only
12335 || (DECL_DECLARED_INLINE_P (decl1)
12336 && ! flag_implement_inlines
12337 && !DECL_VINDEX (decl1)));
12339 /* For WIN32 we also want to put these in linkonce sections. */
12340 maybe_make_one_only (decl1);
12343 DECL_EXTERNAL (decl1) = 0;
12344 DECL_INTERFACE_KNOWN (decl1) = 1;
12345 /* If this function is in an interface implemented in this file,
12346 make sure that the back end knows to emit this function
12348 if (!DECL_EXTERNAL (decl1))
12349 mark_needed (decl1);
12351 else if (finfo->interface_unknown && finfo->interface_only
12352 && honor_interface)
12354 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12355 interface, we will have both finfo->interface_unknown and
12356 finfo->interface_only set. In that case, we don't want to
12357 use the normal heuristics because someone will supply a
12358 #pragma implementation elsewhere, and deducing it here would
12359 produce a conflict. */
12360 comdat_linkage (decl1);
12361 DECL_EXTERNAL (decl1) = 0;
12362 DECL_INTERFACE_KNOWN (decl1) = 1;
12363 DECL_DEFER_OUTPUT (decl1) = 1;
12367 /* This is a definition, not a reference.
12368 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12369 if (!GNU_INLINE_P (decl1))
12370 DECL_EXTERNAL (decl1) = 0;
12372 if ((DECL_DECLARED_INLINE_P (decl1)
12373 || DECL_TEMPLATE_INSTANTIATION (decl1))
12374 && ! DECL_INTERFACE_KNOWN (decl1))
12375 DECL_DEFER_OUTPUT (decl1) = 1;
12377 DECL_INTERFACE_KNOWN (decl1) = 1;
12380 /* Determine the ELF visibility attribute for the function. We must not
12381 do this before calling "pushdecl", as we must allow "duplicate_decls"
12382 to merge any attributes appropriately. We also need to wait until
12384 if (!DECL_CLONED_FUNCTION_P (decl1))
12385 determine_visibility (decl1);
12387 begin_scope (sk_function_parms, decl1);
12391 if (DECL_DESTRUCTOR_P (decl1)
12392 || (DECL_CONSTRUCTOR_P (decl1)
12393 && targetm.cxx.cdtor_returns_this ()))
12395 cdtor_label = build_decl (input_location,
12396 LABEL_DECL, NULL_TREE, NULL_TREE);
12397 DECL_CONTEXT (cdtor_label) = current_function_decl;
12400 start_fname_decls ();
12402 store_parm_decls (current_function_parms);
12406 /* Like start_preparsed_function, except that instead of a
12407 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12409 Returns 1 on success. If the DECLARATOR is not suitable for a function
12410 (it defines a datum instead), we return 0, which tells
12411 yyparse to report a parse error. */
12414 start_function (cp_decl_specifier_seq *declspecs,
12415 const cp_declarator *declarator,
12420 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12421 if (decl1 == error_mark_node)
12423 /* If the declarator is not suitable for a function definition,
12424 cause a syntax error. */
12425 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12427 error ("invalid function declaration");
12431 if (DECL_MAIN_P (decl1))
12432 /* main must return int. grokfndecl should have corrected it
12433 (and issued a diagnostic) if the user got it wrong. */
12434 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12435 integer_type_node));
12437 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12442 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12446 use_eh_spec_block (tree fn)
12448 return (flag_exceptions && flag_enforce_eh_specs
12449 && !processing_template_decl
12450 && !type_throw_all_p (TREE_TYPE (fn))
12451 /* We insert the EH_SPEC_BLOCK only in the original
12452 function; then, it is copied automatically to the
12454 && !DECL_CLONED_FUNCTION_P (fn)
12455 /* Implicitly-generated constructors and destructors have
12456 exception specifications. However, those specifications
12457 are the union of the possible exceptions specified by the
12458 constructors/destructors for bases and members, so no
12459 unallowed exception will ever reach this function. By
12460 not creating the EH_SPEC_BLOCK we save a little memory,
12461 and we avoid spurious warnings about unreachable
12463 && !DECL_ARTIFICIAL (fn));
12466 /* Store the parameter declarations into the current function declaration.
12467 This is called after parsing the parameter declarations, before
12468 digesting the body of the function.
12470 Also install to binding contour return value identifier, if any. */
12473 store_parm_decls (tree current_function_parms)
12475 tree fndecl = current_function_decl;
12478 /* This is a chain of any other decls that came in among the parm
12479 declarations. If a parm is declared with enum {foo, bar} x;
12480 then CONST_DECLs for foo and bar are put here. */
12481 tree nonparms = NULL_TREE;
12483 if (current_function_parms)
12485 /* This case is when the function was defined with an ANSI prototype.
12486 The parms already have decls, so we need not do anything here
12487 except record them as in effect
12488 and complain if any redundant old-style parm decls were written. */
12490 tree specparms = current_function_parms;
12493 /* Must clear this because it might contain TYPE_DECLs declared
12495 current_binding_level->names = NULL;
12497 /* If we're doing semantic analysis, then we'll call pushdecl
12498 for each of these. We must do them in reverse order so that
12499 they end in the correct forward order. */
12500 specparms = nreverse (specparms);
12502 for (parm = specparms; parm; parm = next)
12504 next = DECL_CHAIN (parm);
12505 if (TREE_CODE (parm) == PARM_DECL)
12507 if (DECL_NAME (parm) == NULL_TREE
12508 || TREE_CODE (parm) != VOID_TYPE)
12511 error ("parameter %qD declared void", parm);
12515 /* If we find an enum constant or a type tag,
12516 put it aside for the moment. */
12517 TREE_CHAIN (parm) = NULL_TREE;
12518 nonparms = chainon (nonparms, parm);
12522 /* Get the decls in their original chain order and record in the
12523 function. This is all and only the PARM_DECLs that were
12524 pushed into scope by the loop above. */
12525 DECL_ARGUMENTS (fndecl) = getdecls ();
12528 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12530 /* Now store the final chain of decls for the arguments
12531 as the decl-chain of the current lexical scope.
12532 Put the enumerators in as well, at the front so that
12533 DECL_ARGUMENTS is not modified. */
12534 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12536 if (use_eh_spec_block (current_function_decl))
12537 current_eh_spec_block = begin_eh_spec_block ();
12541 /* We have finished doing semantic analysis on DECL, but have not yet
12542 generated RTL for its body. Save away our current state, so that
12543 when we want to generate RTL later we know what to do. */
12546 save_function_data (tree decl)
12548 struct language_function *f;
12550 /* Save the language-specific per-function data so that we can
12551 get it back when we really expand this function. */
12552 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12555 f = ggc_alloc_language_function ();
12556 memcpy (f, cp_function_chain, sizeof (struct language_function));
12557 DECL_SAVED_FUNCTION_DATA (decl) = f;
12559 /* Clear out the bits we don't need. */
12560 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12561 f->bindings = NULL;
12562 f->x_local_names = NULL;
12566 /* Set the return value of the constructor (if present). */
12569 finish_constructor_body (void)
12574 if (targetm.cxx.cdtor_returns_this ()
12575 && (! TYPE_FOR_JAVA (current_class_type)))
12577 /* Any return from a constructor will end up here. */
12578 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12580 val = DECL_ARGUMENTS (current_function_decl);
12581 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12582 DECL_RESULT (current_function_decl), val);
12583 /* Return the address of the object. */
12584 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12585 add_stmt (exprstmt);
12589 /* Do all the processing for the beginning of a destructor; set up the
12590 vtable pointers and cleanups for bases and members. */
12593 begin_destructor_body (void)
12595 tree compound_stmt;
12597 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12598 issued an error message. We still want to try to process the
12599 body of the function, but initialize_vtbl_ptrs will crash if
12600 TYPE_BINFO is NULL. */
12601 if (COMPLETE_TYPE_P (current_class_type))
12603 compound_stmt = begin_compound_stmt (0);
12604 /* Make all virtual function table pointers in non-virtual base
12605 classes point to CURRENT_CLASS_TYPE's virtual function
12607 initialize_vtbl_ptrs (current_class_ptr);
12608 finish_compound_stmt (compound_stmt);
12610 /* And insert cleanups for our bases and members so that they
12611 will be properly destroyed if we throw. */
12612 push_base_cleanups ();
12616 /* At the end of every destructor we generate code to delete the object if
12617 necessary. Do that now. */
12620 finish_destructor_body (void)
12624 /* Any return from a destructor will end up here; that way all base
12625 and member cleanups will be run when the function returns. */
12626 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12628 /* In a virtual destructor, we must call delete. */
12629 if (DECL_VIRTUAL_P (current_function_decl))
12632 tree virtual_size = cxx_sizeof (current_class_type);
12636 At the point of definition of a virtual destructor (including
12637 an implicit definition), non-placement operator delete shall
12638 be looked up in the scope of the destructor's class and if
12639 found shall be accessible and unambiguous. */
12640 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12642 /*global_p=*/false,
12643 /*placement=*/NULL_TREE,
12644 /*alloc_fn=*/NULL_TREE);
12646 if_stmt = begin_if_stmt ();
12647 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12648 current_in_charge_parm,
12651 finish_expr_stmt (exprstmt);
12652 finish_then_clause (if_stmt);
12653 finish_if_stmt (if_stmt);
12656 if (targetm.cxx.cdtor_returns_this ())
12660 val = DECL_ARGUMENTS (current_function_decl);
12661 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12662 DECL_RESULT (current_function_decl), val);
12663 /* Return the address of the object. */
12664 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12665 add_stmt (exprstmt);
12669 /* Do the necessary processing for the beginning of a function body, which
12670 in this case includes member-initializers, but not the catch clauses of
12671 a function-try-block. Currently, this means opening a binding level
12672 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12675 begin_function_body (void)
12679 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12682 if (processing_template_decl)
12683 /* Do nothing now. */;
12685 /* Always keep the BLOCK node associated with the outermost pair of
12686 curly braces of a function. These are needed for correct
12687 operation of dwarfout.c. */
12688 keep_next_level (true);
12690 stmt = begin_compound_stmt (BCS_FN_BODY);
12692 if (processing_template_decl)
12693 /* Do nothing now. */;
12694 else if (DECL_DESTRUCTOR_P (current_function_decl))
12695 begin_destructor_body ();
12700 /* Do the processing for the end of a function body. Currently, this means
12701 closing out the cleanups for fully-constructed bases and members, and in
12702 the case of the destructor, deleting the object if desired. Again, this
12703 is only meaningful for [cd]tors, since they are the only functions where
12704 there is a significant distinction between the main body and any
12705 function catch clauses. Handling, say, main() return semantics here
12706 would be wrong, as flowing off the end of a function catch clause for
12707 main() would also need to return 0. */
12710 finish_function_body (tree compstmt)
12712 if (compstmt == NULL_TREE)
12715 /* Close the block. */
12716 finish_compound_stmt (compstmt);
12718 if (processing_template_decl)
12719 /* Do nothing now. */;
12720 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12721 finish_constructor_body ();
12722 else if (DECL_DESTRUCTOR_P (current_function_decl))
12723 finish_destructor_body ();
12726 /* Given a function, returns the BLOCK corresponding to the outermost level
12727 of curly braces, skipping the artificial block created for constructor
12731 outer_curly_brace_block (tree fndecl)
12733 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12734 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12735 /* Skip the artificial function body block. */
12736 block = BLOCK_SUBBLOCKS (block);
12740 /* If FNDECL is a class's key method, add the class to the list of
12741 keyed classes that should be emitted. */
12744 record_key_method_defined (tree fndecl)
12746 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12747 && DECL_VIRTUAL_P (fndecl)
12748 && !processing_template_decl)
12750 tree fnclass = DECL_CONTEXT (fndecl);
12751 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12752 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12756 /* Subroutine of finish_function.
12757 Save the body of constexpr functions for possible
12758 future compile time evaluation. */
12761 maybe_save_function_definition (tree fun)
12763 if (!processing_template_decl
12764 && DECL_DECLARED_CONSTEXPR_P (fun)
12765 && !DECL_CLONED_FUNCTION_P (fun))
12766 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12769 /* Finish up a function declaration and compile that function
12770 all the way to assembler language output. The free the storage
12771 for the function definition.
12773 FLAGS is a bitwise or of the following values:
12775 We just finished processing the body of an in-class inline
12776 function definition. (This processing will have taken place
12777 after the class definition is complete.) */
12780 finish_function (int flags)
12782 tree fndecl = current_function_decl;
12783 tree fntype, ctype = NULL_TREE;
12784 int inclass_inline = (flags & 2) != 0;
12786 /* When we get some parse errors, we can end up without a
12787 current_function_decl, so cope. */
12788 if (fndecl == NULL_TREE)
12789 return error_mark_node;
12791 gcc_assert (!defer_mark_used_calls);
12792 defer_mark_used_calls = true;
12794 record_key_method_defined (fndecl);
12796 fntype = TREE_TYPE (fndecl);
12798 /* TREE_READONLY (fndecl) = 1;
12799 This caused &foo to be of type ptr-to-const-function
12800 which then got a warning when stored in a ptr-to-function variable. */
12802 gcc_assert (building_stmt_tree ());
12803 /* The current function is being defined, so its DECL_INITIAL should
12804 be set, and unless there's a multiple definition, it should be
12805 error_mark_node. */
12806 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12808 /* For a cloned function, we've already got all the code we need;
12809 there's no need to add any extra bits. */
12810 if (!DECL_CLONED_FUNCTION_P (fndecl))
12812 if (DECL_MAIN_P (current_function_decl))
12816 /* Make it so that `main' always returns 0 by default (or
12819 stmt = finish_return_stmt (integer_one_node);
12821 stmt = finish_return_stmt (integer_zero_node);
12823 /* Hack. We don't want the middle-end to warn that this
12824 return is unreachable, so put the statement on the
12827 location_t linezero = linemap_line_start (line_table, 0, 1);
12828 SET_EXPR_LOCATION (stmt, linezero);
12832 if (use_eh_spec_block (current_function_decl))
12833 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12834 (TREE_TYPE (current_function_decl)),
12835 current_eh_spec_block);
12838 /* If we're saving up tree structure, tie off the function now. */
12839 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12841 finish_fname_decls ();
12843 /* If this function can't throw any exceptions, remember that. */
12844 if (!processing_template_decl
12845 && !cp_function_chain->can_throw
12846 && !flag_non_call_exceptions
12847 && !decl_replaceable_p (fndecl))
12848 TREE_NOTHROW (fndecl) = 1;
12850 /* This must come after expand_function_end because cleanups might
12851 have declarations (from inline functions) that need to go into
12852 this function's blocks. */
12854 /* If the current binding level isn't the outermost binding level
12855 for this function, either there is a bug, or we have experienced
12856 syntax errors and the statement tree is malformed. */
12857 if (current_binding_level->kind != sk_function_parms)
12859 /* Make sure we have already experienced errors. */
12860 gcc_assert (errorcount);
12862 /* Throw away the broken statement tree and extra binding
12864 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12866 while (current_binding_level->kind != sk_function_parms)
12868 if (current_binding_level->kind == sk_class)
12869 pop_nested_class ();
12871 poplevel (0, 0, 0);
12874 poplevel (1, 0, 1);
12876 /* Statements should always be full-expressions at the outermost set
12877 of curly braces for a function. */
12878 gcc_assert (stmts_are_full_exprs_p ());
12880 /* Save constexpr function body before it gets munged by
12881 the NRV transformation. */
12882 maybe_save_function_definition (fndecl);
12884 /* Set up the named return value optimization, if we can. Candidate
12885 variables are selected in check_return_expr. */
12886 if (current_function_return_value)
12888 tree r = current_function_return_value;
12891 if (r != error_mark_node
12892 /* This is only worth doing for fns that return in memory--and
12893 simpler, since we don't have to worry about promoted modes. */
12894 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12895 /* Only allow this for variables declared in the outer scope of
12896 the function so we know that their lifetime always ends with a
12897 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12898 we were to do this optimization in tree-ssa. */
12899 && (outer = outer_curly_brace_block (fndecl))
12900 && chain_member (r, BLOCK_VARS (outer)))
12901 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12903 current_function_return_value = NULL_TREE;
12906 /* Remember that we were in class scope. */
12907 if (current_class_name)
12908 ctype = current_class_type;
12910 /* Must mark the RESULT_DECL as being in this function. */
12911 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12913 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12914 to the FUNCTION_DECL node itself. */
12915 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12917 /* Save away current state, if appropriate. */
12918 if (!processing_template_decl)
12919 save_function_data (fndecl);
12921 /* Complain if there's just no return statement. */
12922 if (warn_return_type
12923 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12924 && !dependent_type_p (TREE_TYPE (fntype))
12925 && !current_function_returns_value && !current_function_returns_null
12926 /* Don't complain if we abort or throw. */
12927 && !current_function_returns_abnormally
12928 /* Don't complain if we are declared noreturn. */
12929 && !TREE_THIS_VOLATILE (fndecl)
12930 && !DECL_NAME (DECL_RESULT (fndecl))
12931 && !TREE_NO_WARNING (fndecl)
12932 /* Structor return values (if any) are set by the compiler. */
12933 && !DECL_CONSTRUCTOR_P (fndecl)
12934 && !DECL_DESTRUCTOR_P (fndecl))
12936 warning (OPT_Wreturn_type,
12937 "no return statement in function returning non-void");
12938 TREE_NO_WARNING (fndecl) = 1;
12941 /* Store the end of the function, so that we get good line number
12942 info for the epilogue. */
12943 cfun->function_end_locus = input_location;
12945 /* Complain about parameters that are only set, but never otherwise used. */
12946 if (warn_unused_but_set_parameter
12947 && !processing_template_decl
12948 && errorcount == unused_but_set_errorcount
12949 && !DECL_CLONED_FUNCTION_P (fndecl))
12953 for (decl = DECL_ARGUMENTS (fndecl);
12955 decl = DECL_CHAIN (decl))
12956 if (TREE_USED (decl)
12957 && TREE_CODE (decl) == PARM_DECL
12958 && !DECL_READ_P (decl)
12959 && DECL_NAME (decl)
12960 && !DECL_ARTIFICIAL (decl)
12961 && !TREE_NO_WARNING (decl)
12962 && !DECL_IN_SYSTEM_HEADER (decl)
12963 && TREE_TYPE (decl) != error_mark_node
12964 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
12965 && (!CLASS_TYPE_P (TREE_TYPE (decl))
12966 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
12967 warning (OPT_Wunused_but_set_parameter,
12968 "parameter %q+D set but not used", decl);
12969 unused_but_set_errorcount = errorcount;
12972 /* Genericize before inlining. */
12973 if (!processing_template_decl)
12975 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12976 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
12977 cp_genericize (fndecl);
12978 /* Clear out the bits we don't need. */
12979 f->x_current_class_ptr = NULL;
12980 f->x_current_class_ref = NULL;
12981 f->x_eh_spec_block = NULL;
12982 f->x_in_charge_parm = NULL;
12983 f->x_vtt_parm = NULL;
12984 f->x_return_value = NULL;
12985 f->bindings = NULL;
12986 f->extern_decl_map = NULL;
12988 /* Clear out the bits we don't need. */
12989 local_names = NULL;
12991 /* We're leaving the context of this function, so zap cfun. It's still in
12992 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12994 current_function_decl = NULL;
12996 /* If this is an in-class inline definition, we may have to pop the
12997 bindings for the template parameters that we added in
12998 maybe_begin_member_template_processing when start_function was
13000 if (inclass_inline)
13001 maybe_end_member_template_processing ();
13003 /* Leave the scope of the class. */
13005 pop_nested_class ();
13010 current_function_decl = NULL_TREE;
13012 defer_mark_used_calls = false;
13013 if (deferred_mark_used_calls)
13018 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13020 VEC_free (tree, gc, deferred_mark_used_calls);
13026 /* Create the FUNCTION_DECL for a function definition.
13027 DECLSPECS and DECLARATOR are the parts of the declaration;
13028 they describe the return type and the name of the function,
13029 but twisted together in a fashion that parallels the syntax of C.
13031 This function creates a binding context for the function body
13032 as well as setting up the FUNCTION_DECL in current_function_decl.
13034 Returns a FUNCTION_DECL on success.
13036 If the DECLARATOR is not suitable for a function (it defines a datum
13037 instead), we return 0, which tells yyparse to report a parse error.
13039 May return void_type_node indicating that this method is actually
13040 a friend. See grokfield for more details.
13042 Came here with a `.pushlevel' .
13044 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13045 CHANGES TO CODE IN `grokfield'. */
13048 grokmethod (cp_decl_specifier_seq *declspecs,
13049 const cp_declarator *declarator, tree attrlist)
13051 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13054 if (fndecl == error_mark_node)
13055 return error_mark_node;
13057 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13059 error ("invalid member function declaration");
13060 return error_mark_node;
13064 cplus_decl_attributes (&fndecl, attrlist, 0);
13066 /* Pass friends other than inline friend functions back. */
13067 if (fndecl == void_type_node)
13070 if (DECL_IN_AGGR_P (fndecl))
13072 if (DECL_CONTEXT (fndecl)
13073 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
13074 error ("%qD is already defined in class %qT", fndecl,
13075 DECL_CONTEXT (fndecl));
13076 return error_mark_node;
13079 check_template_shadow (fndecl);
13081 DECL_DECLARED_INLINE_P (fndecl) = 1;
13082 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13084 /* We process method specializations in finish_struct_1. */
13085 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13087 fndecl = push_template_decl (fndecl);
13088 if (fndecl == error_mark_node)
13092 if (! DECL_FRIEND_P (fndecl))
13094 if (DECL_CHAIN (fndecl))
13096 fndecl = copy_node (fndecl);
13097 TREE_CHAIN (fndecl) = NULL_TREE;
13101 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13103 DECL_IN_AGGR_P (fndecl) = 1;
13108 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13109 we can lay it out later, when and if its type becomes complete. */
13112 maybe_register_incomplete_var (tree var)
13114 gcc_assert (TREE_CODE (var) == VAR_DECL);
13116 /* Keep track of variables with incomplete types. */
13117 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13118 && DECL_EXTERNAL (var))
13120 tree inner_type = TREE_TYPE (var);
13122 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13123 inner_type = TREE_TYPE (inner_type);
13124 inner_type = TYPE_MAIN_VARIANT (inner_type);
13126 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13127 /* RTTI TD entries are created while defining the type_info. */
13128 || (TYPE_LANG_SPECIFIC (inner_type)
13129 && TYPE_BEING_DEFINED (inner_type)))
13132 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13134 iv->incomplete_type = inner_type;
13139 /* Called when a class type (given by TYPE) is defined. If there are
13140 any existing VAR_DECLs whose type has been completed by this
13141 declaration, update them now. */
13144 complete_vars (tree type)
13147 incomplete_var *iv;
13149 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13151 if (same_type_p (type, iv->incomplete_type))
13153 tree var = iv->decl;
13154 tree type = TREE_TYPE (var);
13155 /* Complete the type of the variable. The VAR_DECL itself
13156 will be laid out in expand_expr. */
13157 complete_type (type);
13158 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13159 /* Remove this entry from the list. */
13160 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13166 /* Check for pending declarations which may have abstract type. */
13167 complete_type_check_abstract (type);
13170 /* If DECL is of a type which needs a cleanup, build and return an
13171 expression to perform that cleanup here. Return NULL_TREE if no
13172 cleanup need be done. */
13175 cxx_maybe_build_cleanup (tree decl)
13181 /* Assume no cleanup is required. */
13182 cleanup = NULL_TREE;
13184 if (error_operand_p (decl))
13187 /* Handle "__attribute__((cleanup))". We run the cleanup function
13188 before the destructor since the destructor is what actually
13189 terminates the lifetime of the object. */
13190 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13197 /* Get the name specified by the user for the cleanup function. */
13198 id = TREE_VALUE (TREE_VALUE (attr));
13199 /* Look up the name to find the cleanup function to call. It is
13200 important to use lookup_name here because that is what is
13201 used in c-common.c:handle_cleanup_attribute when performing
13202 initial checks on the attribute. Note that those checks
13203 include ensuring that the function found is not an overloaded
13204 function, or an object with an overloaded call operator,
13205 etc.; we can rely on the fact that the function found is an
13206 ordinary FUNCTION_DECL. */
13207 fn = lookup_name (id);
13208 arg = build_address (decl);
13210 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13213 /* Handle ordinary C++ destructors. */
13214 type = TREE_TYPE (decl);
13215 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13217 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13218 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13219 && CLASSTYPE_VBASECLASSES (type));
13223 if (TREE_CODE (type) == ARRAY_TYPE)
13226 addr = build_address (decl);
13228 /* Optimize for space over speed here. */
13229 if (!has_vbases || flag_expensive_optimizations)
13230 flags |= LOOKUP_NONVIRTUAL;
13232 call = build_delete (TREE_TYPE (addr), addr,
13233 sfk_complete_destructor, flags, 0);
13235 cleanup = build_compound_expr (input_location, cleanup, call);
13243 /* When a stmt has been parsed, this function is called. */
13250 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13251 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13252 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13255 static_fn_type (tree memfntype)
13260 if (TYPE_PTRMEMFUNC_P (memfntype))
13261 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13262 if (POINTER_TYPE_P (memfntype)
13263 || TREE_CODE (memfntype) == FUNCTION_DECL)
13264 memfntype = TREE_TYPE (memfntype);
13265 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13267 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13268 args = TYPE_ARG_TYPES (memfntype);
13269 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13270 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13271 fntype = (cp_build_type_attribute_variant
13272 (fntype, TYPE_ATTRIBUTES (memfntype)));
13273 fntype = (build_exception_variant
13274 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13278 /* DECL was originally constructed as a non-static member function,
13279 but turned out to be static. Update it accordingly. */
13282 revert_static_member_fn (tree decl)
13284 TREE_TYPE (decl) = static_fn_type (decl);
13286 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13287 error ("static member function %q#D declared with type qualifiers", decl);
13289 if (DECL_ARGUMENTS (decl))
13290 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13291 DECL_STATIC_FUNCTION_P (decl) = 1;
13294 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13295 one of the language-independent trees. */
13297 enum cp_tree_node_structure_enum
13298 cp_tree_node_structure (union lang_tree_node * t)
13300 switch (TREE_CODE (&t->generic))
13302 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13303 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13304 case OVERLOAD: return TS_CP_OVERLOAD;
13305 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13306 case PTRMEM_CST: return TS_CP_PTRMEM;
13307 case BASELINK: return TS_CP_BASELINK;
13308 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13309 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13310 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13311 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13312 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13313 default: return TS_CP_GENERIC;
13317 /* Build the void_list_node (void_type_node having been created). */
13319 build_void_list_node (void)
13321 tree t = build_tree_list (NULL_TREE, void_type_node);
13326 cp_missing_noreturn_ok_p (tree decl)
13328 /* A missing noreturn is ok for the `main' function. */
13329 return DECL_MAIN_P (decl);
13332 /* Return the COMDAT group into which DECL should be placed. */
13335 cxx_comdat_group (tree decl)
13339 /* Virtual tables, construction virtual tables, and virtual table
13340 tables all go in a single COMDAT group, named after the primary
13342 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13343 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13344 /* For all other DECLs, the COMDAT group is the mangled name of the
13345 declaration itself. */
13348 while (DECL_THUNK_P (decl))
13350 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13351 into the same section as the target function. In that case
13352 we must return target's name. */
13353 tree target = THUNK_TARGET (decl);
13354 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13355 && DECL_SECTION_NAME (target) != NULL
13356 && DECL_ONE_ONLY (target))
13361 name = DECL_ASSEMBLER_NAME (decl);
13367 #include "gt-cp-decl.h"