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
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"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
57 static tree grokparms (tree parmlist, tree *);
58 static const char *redeclaration_error_message (tree, tree);
60 static int decl_jump_unsafe (tree);
61 static void require_complete_types_for_parms (tree);
62 static int ambi_op_p (enum tree_code);
63 static int unary_op_p (enum tree_code);
64 static void push_local_name (tree);
65 static tree grok_reference_init (tree, tree, tree, tree *);
66 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
68 static void record_unknown_type (tree, const char *);
69 static tree builtin_function_1 (tree, tree, bool);
70 static tree build_library_fn_1 (tree, enum tree_code, tree);
71 static int member_function_or_else (tree, tree, enum overload_flags);
72 static void bad_specifiers (tree, const char *, int, int, int, int,
74 static void check_for_uninitialized_const_var (tree);
75 static hashval_t typename_hash (const void *);
76 static int typename_compare (const void *, const void *);
77 static tree local_variable_p_walkfn (tree *, int *, void *);
78 static tree record_builtin_java_type (const char *, int);
79 static const char *tag_name (enum tag_types);
80 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
81 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
82 static void maybe_deduce_size_from_array_init (tree, tree);
83 static void layout_var_decl (tree);
84 static void maybe_commonize_var (tree);
85 static tree check_initializer (tree, tree, int, tree *);
86 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
87 static void save_function_data (tree);
88 static void check_function_type (tree, tree);
89 static void finish_constructor_body (void);
90 static void begin_destructor_body (void);
91 static void finish_destructor_body (void);
92 static tree create_array_type_for_decl (tree, tree, tree);
93 static tree get_atexit_node (void);
94 static tree get_dso_handle_node (void);
95 static tree start_cleanup_fn (void);
96 static void end_cleanup_fn (void);
97 static tree cp_make_fname_decl (tree, int);
98 static void initialize_predefined_identifiers (void);
99 static tree check_special_function_return_type
100 (special_function_kind, tree, tree);
101 static tree push_cp_library_fn (enum tree_code, tree);
102 static tree build_cp_library_fn (tree, enum tree_code, tree);
103 static void store_parm_decls (tree);
104 static void initialize_local_var (tree, tree);
105 static void expand_static_init (tree, tree);
106 static tree next_initializable_field (tree);
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
124 tree vtbl_ptr_type_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
137 The FUNCTION_DECL for the default `::operator delete'.
139 tree global_delete_fndecl;
142 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
143 tree tinfo_var_id; */
145 tree cp_global_trees[CPTI_MAX];
147 /* Indicates that there is a type value in some namespace, although
148 that is not necessarily in scope at the moment. */
150 tree global_type_node;
152 /* The node that holds the "name" of the global scope. */
153 tree global_scope_name;
155 #define local_names cp_function_chain->x_local_names
157 /* A list of objects which have constructors or destructors
158 which reside in the global scope. The decl is stored in
159 the TREE_VALUE slot and the initializer is stored
160 in the TREE_PURPOSE slot. */
161 tree static_aggregates;
165 /* A node for the integer constants 2, and 3. */
167 tree integer_two_node, integer_three_node;
169 /* Used only for jumps to as-yet undefined labels, since jumps to
170 defined labels can have their validity checked immediately. */
172 struct named_label_use_entry GTY(())
174 struct named_label_use_entry *next;
175 /* The binding level to which this entry is *currently* attached.
176 This is initially the binding level in which the goto appeared,
177 but is modified as scopes are closed. */
178 struct cp_binding_level *binding_level;
179 /* The head of the names list that was current when the goto appeared,
180 or the inner scope popped. These are the decls that will *not* be
181 skipped when jumping to the label. */
183 /* The location of the goto, for error reporting. */
184 location_t o_goto_locus;
185 /* True if an OpenMP structured block scope has been closed since
186 the goto appeared. This means that the branch from the label will
187 illegally exit an OpenMP scope. */
191 /* A list of all LABEL_DECLs in the function that have names. Here so
192 we can clear out their names' definitions at the end of the
193 function, and so we can check the validity of jumps to these labels. */
195 struct named_label_entry GTY(())
197 /* The decl itself. */
200 /* The binding level to which the label is *currently* attached.
201 This is initially set to the binding level in which the label
202 is defined, but is modified as scopes are closed. */
203 struct cp_binding_level *binding_level;
204 /* The head of the names list that was current when the label was
205 defined, or the inner scope popped. These are the decls that will
206 be skipped when jumping to the label. */
208 /* A tree list of all decls from all binding levels that would be
209 crossed by a backward branch to the label. */
212 /* A list of uses of the label, before the label is defined. */
213 struct named_label_use_entry *uses;
215 /* The following bits are set after the label is defined, and are
216 updated as scopes are popped. They indicate that a backward jump
217 to the label will illegally enter a scope of the given flavor. */
223 #define named_labels cp_function_chain->x_named_labels
225 /* The number of function bodies which we are currently processing.
226 (Zero if we are at namespace scope, one inside the body of a
227 function, two inside the body of a function in a local class, etc.) */
230 /* To avoid unwanted recursion, finish_function defers all mark_used calls
231 encountered during its execution until it finishes. */
232 bool defer_mark_used_calls;
233 VEC(tree, gc) *deferred_mark_used_calls;
235 /* States indicating how grokdeclarator() should handle declspecs marked
236 with __attribute__((deprecated)). An object declared as
237 __attribute__((deprecated)) suppresses warnings of uses of other
239 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
242 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
243 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
244 time the VAR_DECL was declared, the type was incomplete. */
246 static GTY(()) tree incomplete_vars;
248 /* Returns the kind of template specialization we are currently
249 processing, given that it's declaration contained N_CLASS_SCOPES
250 explicit scope qualifications. */
253 current_tmpl_spec_kind (int n_class_scopes)
255 int n_template_parm_scopes = 0;
256 int seen_specialization_p = 0;
257 int innermost_specialization_p = 0;
258 struct cp_binding_level *b;
260 /* Scan through the template parameter scopes. */
261 for (b = current_binding_level;
262 b->kind == sk_template_parms;
265 /* If we see a specialization scope inside a parameter scope,
266 then something is wrong. That corresponds to a declaration
269 template <class T> template <> ...
271 which is always invalid since [temp.expl.spec] forbids the
272 specialization of a class member template if the enclosing
273 class templates are not explicitly specialized as well. */
274 if (b->explicit_spec_p)
276 if (n_template_parm_scopes == 0)
277 innermost_specialization_p = 1;
279 seen_specialization_p = 1;
281 else if (seen_specialization_p == 1)
282 return tsk_invalid_member_spec;
284 ++n_template_parm_scopes;
287 /* Handle explicit instantiations. */
288 if (processing_explicit_instantiation)
290 if (n_template_parm_scopes != 0)
291 /* We've seen a template parameter list during an explicit
292 instantiation. For example:
294 template <class T> template void f(int);
296 This is erroneous. */
297 return tsk_invalid_expl_inst;
299 return tsk_expl_inst;
302 if (n_template_parm_scopes < n_class_scopes)
303 /* We've not seen enough template headers to match all the
304 specialized classes present. For example:
306 template <class T> void R<T>::S<T>::f(int);
308 This is invalid; there needs to be one set of template
309 parameters for each class. */
310 return tsk_insufficient_parms;
311 else if (n_template_parm_scopes == n_class_scopes)
312 /* We're processing a non-template declaration (even though it may
313 be a member of a template class.) For example:
315 template <class T> void S<T>::f(int);
317 The `class T' matches the `S<T>', leaving no template headers
318 corresponding to the `f'. */
320 else if (n_template_parm_scopes > n_class_scopes + 1)
321 /* We've got too many template headers. For example:
323 template <> template <class T> void f (T);
325 There need to be more enclosing classes. */
326 return tsk_excessive_parms;
328 /* This must be a template. It's of the form:
330 template <class T> template <class U> void S<T>::f(U);
332 This is a specialization if the innermost level was a
333 specialization; otherwise it's just a definition of the
335 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
338 /* Exit the current scope. */
346 /* When a label goes out of scope, check to see if that label was used
347 in a valid manner, and issue any appropriate warnings or errors. */
350 pop_label (tree label, tree old_value)
352 if (!processing_template_decl)
354 if (DECL_INITIAL (label) == NULL_TREE)
358 error ("label %q+D used but not defined", label);
359 location = input_location; /* FIXME want (input_filename, (line)0) */
360 /* Avoid crashing later. */
361 define_label (location, DECL_NAME (label));
364 warn_for_unused_label (label);
367 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
370 /* At the end of a function, all labels declared within the function
371 go out of scope. BLOCK is the top-level block for the
375 pop_labels_1 (void **slot, void *data)
377 struct named_label_entry *ent = (struct named_label_entry *) *slot;
378 tree block = (tree) data;
380 pop_label (ent->label_decl, NULL_TREE);
382 /* Put the labels into the "variables" of the top-level block,
383 so debugger can see them. */
384 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
385 BLOCK_VARS (block) = ent->label_decl;
387 htab_clear_slot (named_labels, slot);
393 pop_labels (tree block)
397 htab_traverse (named_labels, pop_labels_1, block);
402 /* At the end of a block with local labels, restore the outer definition. */
405 pop_local_label (tree label, tree old_value)
407 struct named_label_entry dummy;
410 pop_label (label, old_value);
412 dummy.label_decl = label;
413 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
414 htab_clear_slot (named_labels, slot);
417 /* The following two routines are used to interface to Objective-C++.
418 The binding level is purposely treated as an opaque type. */
421 objc_get_current_scope (void)
423 return current_binding_level;
426 /* The following routine is used by the NeXT-style SJLJ exceptions;
427 variables get marked 'volatile' so as to not be clobbered by
428 _setjmp()/_longjmp() calls. All variables in the current scope,
429 as well as parent scopes up to (but not including) ENCLOSING_BLK
430 shall be thusly marked. */
433 objc_mark_locals_volatile (void *enclosing_blk)
435 struct cp_binding_level *scope;
437 for (scope = current_binding_level;
438 scope && scope != enclosing_blk;
439 scope = scope->level_chain)
443 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
444 objc_volatilize_decl (decl);
446 /* Do not climb up past the current function. */
447 if (scope->kind == sk_function_parms)
452 /* Update data for defined and undefined labels when leaving a scope. */
455 poplevel_named_label_1 (void **slot, void *data)
457 struct named_label_entry *ent = (struct named_label_entry *) *slot;
458 struct cp_binding_level *bl = (struct cp_binding_level *) data;
459 struct cp_binding_level *obl = bl->level_chain;
461 if (ent->binding_level == bl)
465 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
466 if (decl_jump_unsafe (decl))
467 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
469 ent->binding_level = obl;
470 ent->names_in_scope = obl->names;
474 ent->in_try_scope = true;
477 ent->in_catch_scope = true;
480 ent->in_omp_scope = true;
488 struct named_label_use_entry *use;
490 for (use = ent->uses; use ; use = use->next)
491 if (use->binding_level == bl)
493 use->binding_level = obl;
494 use->names_in_scope = obl->names;
495 if (bl->kind == sk_omp)
496 use->in_omp_scope = true;
503 /* Exit a binding level.
504 Pop the level off, and restore the state of the identifier-decl mappings
505 that were in effect when this level was entered.
507 If KEEP == 1, this level had explicit declarations, so
508 and create a "block" (a BLOCK node) for the level
509 to record its declarations and subblocks for symbol table output.
511 If FUNCTIONBODY is nonzero, this level is the body of a function,
512 so create a block as if KEEP were set and also clear out all
515 If REVERSE is nonzero, reverse the order of decls before putting
516 them into the BLOCK. */
519 poplevel (int keep, int reverse, int functionbody)
522 /* The chain of decls was accumulated in reverse order.
523 Put it into forward order, just for cleanliness. */
525 int tmp = functionbody;
526 int real_functionbody;
530 int leaving_for_scope;
533 timevar_push (TV_NAME_LOOKUP);
538 gcc_assert (current_binding_level->kind != sk_class);
540 real_functionbody = (current_binding_level->kind == sk_cleanup
541 ? ((functionbody = 0), tmp) : functionbody);
542 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
544 gcc_assert (!VEC_length(cp_class_binding,
545 current_binding_level->class_shadowed));
547 /* We used to use KEEP == 2 to indicate that the new block should go
548 at the beginning of the list of blocks at this binding level,
549 rather than the end. This hack is no longer used. */
550 gcc_assert (keep == 0 || keep == 1);
552 if (current_binding_level->keep)
555 /* Any uses of undefined labels, and any defined labels, now operate
556 under constraints of next binding contour. */
557 if (cfun && !functionbody && named_labels)
558 htab_traverse (named_labels, poplevel_named_label_1,
559 current_binding_level);
561 /* Get the decls in the order they were written.
562 Usually current_binding_level->names is in reverse order.
563 But parameter decls were previously put in forward order. */
566 current_binding_level->names
567 = decls = nreverse (current_binding_level->names);
569 decls = current_binding_level->names;
571 /* If there were any declarations or structure tags in that level,
572 or if this level is a function body,
573 create a BLOCK to record them for the life of this function. */
575 if (keep == 1 || functionbody)
576 block = make_node (BLOCK);
577 if (block != NULL_TREE)
579 BLOCK_VARS (block) = decls;
580 BLOCK_SUBBLOCKS (block) = subblocks;
583 /* In each subblock, record that this is its superior. */
585 for (link = subblocks; link; link = BLOCK_CHAIN (link))
586 BLOCK_SUPERCONTEXT (link) = block;
588 /* We still support the old for-scope rules, whereby the variables
589 in a for-init statement were in scope after the for-statement
590 ended. We only use the new rules if flag_new_for_scope is
593 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
595 /* Before we remove the declarations first check for unused variables. */
596 if (warn_unused_variable
597 && !processing_template_decl)
598 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
599 if (TREE_CODE (decl) == VAR_DECL
600 && ! TREE_USED (decl)
601 && ! DECL_IN_SYSTEM_HEADER (decl)
602 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
603 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
605 /* Remove declarations for all the DECLs in this level. */
606 for (link = decls; link; link = TREE_CHAIN (link))
608 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
611 tree name = DECL_NAME (link);
615 ob = outer_binding (name,
616 IDENTIFIER_BINDING (name),
619 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
621 ns_binding = NULL_TREE;
623 if (ob && ob->scope == current_binding_level->level_chain)
624 /* We have something like:
629 and we are leaving the `for' scope. There's no reason to
630 keep the binding of the inner `i' in this case. */
631 pop_binding (name, link);
632 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
633 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
634 /* Here, we have something like:
642 We must pop the for-scope binding so we know what's a
643 type and what isn't. */
644 pop_binding (name, link);
647 /* Mark this VAR_DECL as dead so that we can tell we left it
648 there only for backward compatibility. */
649 DECL_DEAD_FOR_LOCAL (link) = 1;
651 /* Keep track of what should have happened when we
652 popped the binding. */
655 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
656 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
659 /* Add it to the list of dead variables in the next
660 outermost binding to that we can remove these when we
661 leave that binding. */
662 current_binding_level->level_chain->dead_vars_from_for
663 = tree_cons (NULL_TREE, link,
664 current_binding_level->level_chain->
667 /* Although we don't pop the cxx_binding, we do clear
668 its SCOPE since the scope is going away now. */
669 IDENTIFIER_BINDING (name)->scope
670 = current_binding_level->level_chain;
677 /* Remove the binding. */
680 if (TREE_CODE (decl) == TREE_LIST)
681 decl = TREE_VALUE (decl);
684 if (TREE_CODE (name) == OVERLOAD)
685 name = OVL_FUNCTION (name);
687 gcc_assert (DECL_P (name));
688 pop_binding (DECL_NAME (name), decl);
692 /* Remove declarations for any `for' variables from inner scopes
693 that we kept around. */
694 for (link = current_binding_level->dead_vars_from_for;
695 link; link = TREE_CHAIN (link))
696 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
698 /* Restore the IDENTIFIER_TYPE_VALUEs. */
699 for (link = current_binding_level->type_shadowed;
700 link; link = TREE_CHAIN (link))
701 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
703 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
704 for (link = current_binding_level->shadowed_labels;
706 link = TREE_CHAIN (link))
707 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
709 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
710 list if a `using' declaration put them there. The debugging
711 back ends won't understand OVERLOAD, so we remove them here.
712 Because the BLOCK_VARS are (temporarily) shared with
713 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
714 popped all the bindings. */
719 for (d = &BLOCK_VARS (block); *d; )
721 if (TREE_CODE (*d) == TREE_LIST)
722 *d = TREE_CHAIN (*d);
724 d = &TREE_CHAIN (*d);
728 /* If the level being exited is the top level of a function,
729 check over all the labels. */
732 /* Since this is the top level block of a function, the vars are
733 the function's parameters. Don't leave them in the BLOCK
734 because they are found in the FUNCTION_DECL instead. */
735 BLOCK_VARS (block) = 0;
739 kind = current_binding_level->kind;
740 if (kind == sk_cleanup)
744 /* If this is a temporary binding created for a cleanup, then we'll
745 have pushed a statement list level. Pop that, create a new
746 BIND_EXPR for the block, and insert it into the stream. */
747 stmt = pop_stmt_list (current_binding_level->statement_list);
748 stmt = c_build_bind_expr (block, stmt);
755 /* The current function is being defined, so its DECL_INITIAL
756 should be error_mark_node. */
757 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
758 DECL_INITIAL (current_function_decl) = block;
761 current_binding_level->blocks
762 = chainon (current_binding_level->blocks, block);
764 /* If we did not make a block for the level just exited,
765 any blocks made for inner levels
766 (since they cannot be recorded as subblocks in that level)
767 must be carried forward so they will later become subblocks
768 of something else. */
770 current_binding_level->blocks
771 = chainon (current_binding_level->blocks, subblocks);
773 /* Each and every BLOCK node created here in `poplevel' is important
774 (e.g. for proper debugging information) so if we created one
775 earlier, mark it as "used". */
777 TREE_USED (block) = 1;
779 /* All temporary bindings created for cleanups are popped silently. */
780 if (kind == sk_cleanup)
783 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
786 /* Insert BLOCK at the end of the list of subblocks of the
787 current binding level. This is used when a BIND_EXPR is expanded,
788 to handle the BLOCK node inside the BIND_EXPR. */
791 insert_block (tree block)
793 TREE_USED (block) = 1;
794 current_binding_level->blocks
795 = chainon (current_binding_level->blocks, block);
798 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
799 itself, calling F for each. The DATA is passed to F as well. */
802 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
805 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
807 result |= (*f) (name_space, data);
809 for (; current; current = TREE_CHAIN (current))
810 result |= walk_namespaces_r (current, f, data);
815 /* Walk all the namespaces, calling F for each. The DATA is passed to
819 walk_namespaces (walk_namespaces_fn f, void* data)
821 return walk_namespaces_r (global_namespace, f, data);
824 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
825 DATA is non-NULL, this is the last time we will call
826 wrapup_global_declarations for this NAMESPACE. */
829 wrapup_globals_for_namespace (tree name_space, void* data)
831 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
832 VEC(tree,gc) *statics = level->static_decls;
833 tree *vec = VEC_address (tree, statics);
834 int len = VEC_length (tree, statics);
835 int last_time = (data != 0);
839 check_global_declarations (vec, len);
840 emit_debug_global_declarations (vec, len);
844 /* Write out any globals that need to be output. */
845 return wrapup_global_declarations (vec, len);
849 /* In C++, you don't have to write `struct S' to refer to `S'; you
850 can just use `S'. We accomplish this by creating a TYPE_DECL as
851 if the user had written `typedef struct S S'. Create and return
852 the TYPE_DECL for TYPE. */
855 create_implicit_typedef (tree name, tree type)
859 decl = build_decl (TYPE_DECL, name, type);
860 DECL_ARTIFICIAL (decl) = 1;
861 /* There are other implicit type declarations, like the one *within*
862 a class that allows you to write `S::S'. We must distinguish
864 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
865 TYPE_NAME (type) = decl;
870 /* Remember a local name for name-mangling purposes. */
873 push_local_name (tree decl)
878 timevar_push (TV_NAME_LOOKUP);
880 name = DECL_NAME (decl);
882 nelts = VEC_length (tree, local_names);
883 for (i = 0; i < nelts; i++)
885 t = VEC_index (tree, local_names, i);
886 if (DECL_NAME (t) == name)
888 if (!DECL_LANG_SPECIFIC (decl))
889 retrofit_lang_decl (decl);
890 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
891 if (DECL_LANG_SPECIFIC (t))
892 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
894 DECL_DISCRIMINATOR (decl) = 1;
896 VEC_replace (tree, local_names, i, decl);
897 timevar_pop (TV_NAME_LOOKUP);
902 VEC_safe_push (tree, gc, local_names, decl);
903 timevar_pop (TV_NAME_LOOKUP);
906 /* Subroutine of duplicate_decls: return truthvalue of whether
907 or not types of these decls match.
909 For C++, we must compare the parameter list so that `int' can match
910 `int&' in a parameter position, but `int&' is not confused with
914 decls_match (tree newdecl, tree olddecl)
918 if (newdecl == olddecl)
921 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
922 /* If the two DECLs are not even the same kind of thing, we're not
923 interested in their types. */
926 if (TREE_CODE (newdecl) == FUNCTION_DECL)
928 tree f1 = TREE_TYPE (newdecl);
929 tree f2 = TREE_TYPE (olddecl);
930 tree p1 = TYPE_ARG_TYPES (f1);
931 tree p2 = TYPE_ARG_TYPES (f2);
933 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
934 && ! (DECL_EXTERN_C_P (newdecl)
935 && DECL_EXTERN_C_P (olddecl)))
938 if (TREE_CODE (f1) != TREE_CODE (f2))
941 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
943 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
944 && (DECL_BUILT_IN (olddecl)
945 #ifndef NO_IMPLICIT_EXTERN_C
946 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
947 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
951 types_match = self_promoting_args_p (p1);
952 if (p1 == void_list_node)
953 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
955 #ifndef NO_IMPLICIT_EXTERN_C
956 else if (p1 == NULL_TREE
957 && (DECL_EXTERN_C_P (olddecl)
958 && DECL_IN_SYSTEM_HEADER (olddecl)
959 && !DECL_CLASS_SCOPE_P (olddecl))
960 && (DECL_EXTERN_C_P (newdecl)
961 && DECL_IN_SYSTEM_HEADER (newdecl)
962 && !DECL_CLASS_SCOPE_P (newdecl)))
964 types_match = self_promoting_args_p (p2);
965 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
969 types_match = compparms (p1, p2);
974 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
976 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
977 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
980 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
981 DECL_TEMPLATE_PARMS (olddecl)))
984 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
985 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
986 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
988 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
989 DECL_TEMPLATE_RESULT (newdecl));
993 /* Need to check scope for variable declaration (VAR_DECL).
994 For typedef (TYPE_DECL), scope is ignored. */
995 if (TREE_CODE (newdecl) == VAR_DECL
996 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
998 Two declarations for an object with C language linkage
999 with the same name (ignoring the namespace that qualify
1000 it) that appear in different namespace scopes refer to
1002 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1005 if (TREE_TYPE (newdecl) == error_mark_node)
1006 types_match = TREE_TYPE (olddecl) == error_mark_node;
1007 else if (TREE_TYPE (olddecl) == NULL_TREE)
1008 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1009 else if (TREE_TYPE (newdecl) == NULL_TREE)
1012 types_match = comptypes (TREE_TYPE (newdecl),
1013 TREE_TYPE (olddecl),
1014 COMPARE_REDECLARATION);
1020 /* If NEWDECL is `static' and an `extern' was seen previously,
1021 warn about it. OLDDECL is the previous declaration.
1023 Note that this does not apply to the C++ case of declaring
1024 a variable `extern const' and then later `const'.
1026 Don't complain about built-in functions, since they are beyond
1027 the user's control. */
1030 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1034 if (TREE_CODE (newdecl) == TYPE_DECL
1035 || TREE_CODE (newdecl) == TEMPLATE_DECL
1036 || TREE_CODE (newdecl) == CONST_DECL
1037 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1040 /* Don't get confused by static member functions; that's a different
1042 if (TREE_CODE (newdecl) == FUNCTION_DECL
1043 && DECL_STATIC_FUNCTION_P (newdecl))
1046 /* If the old declaration was `static', or the new one isn't, then
1047 then everything is OK. */
1048 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1051 /* It's OK to declare a builtin function as `static'. */
1052 if (TREE_CODE (olddecl) == FUNCTION_DECL
1053 && DECL_ARTIFICIAL (olddecl))
1056 name = DECL_ASSEMBLER_NAME (newdecl);
1057 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1058 permerror (input_location, "previous declaration of %q+D", olddecl);
1061 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1062 function templates. If their exception specifications do not
1063 match, issue a diagnostic. */
1066 check_redeclaration_exception_specification (tree new_decl,
1071 tree new_exceptions;
1072 tree old_exceptions;
1074 new_type = TREE_TYPE (new_decl);
1075 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1076 old_type = TREE_TYPE (old_decl);
1077 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1081 If any declaration of a function has an exception-specification,
1082 all declarations, including the definition and an explicit
1083 specialization, of that function shall have an
1084 exception-specification with the same set of type-ids. */
1085 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1086 && ! DECL_IS_BUILTIN (old_decl)
1088 && !comp_except_specs (new_exceptions, old_exceptions,
1091 error ("declaration of %qF throws different exceptions", new_decl);
1092 error ("from previous declaration %q+F", old_decl);
1096 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1097 && lookup_attribute ("gnu_inline", \
1098 DECL_ATTRIBUTES (fn)))
1100 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1101 If the redeclaration is invalid, a diagnostic is issued, and the
1102 error_mark_node is returned. Otherwise, OLDDECL is returned.
1104 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1107 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1110 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1112 unsigned olddecl_uid = DECL_UID (olddecl);
1113 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1114 int new_defines_function = 0;
1117 if (newdecl == olddecl)
1120 types_match = decls_match (newdecl, olddecl);
1122 /* If either the type of the new decl or the type of the old decl is an
1123 error_mark_node, then that implies that we have already issued an
1124 error (earlier) for some bogus type specification, and in that case,
1125 it is rather pointless to harass the user with yet more error message
1126 about the same declaration, so just pretend the types match here. */
1127 if (TREE_TYPE (newdecl) == error_mark_node
1128 || TREE_TYPE (olddecl) == error_mark_node)
1129 return error_mark_node;
1131 if (DECL_P (olddecl)
1132 && TREE_CODE (newdecl) == FUNCTION_DECL
1133 && TREE_CODE (olddecl) == FUNCTION_DECL
1134 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1136 if (DECL_DECLARED_INLINE_P (newdecl)
1137 && DECL_UNINLINABLE (newdecl)
1138 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1139 /* Already warned elsewhere. */;
1140 else if (DECL_DECLARED_INLINE_P (olddecl)
1141 && DECL_UNINLINABLE (olddecl)
1142 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1143 /* Already warned. */;
1144 else if (DECL_DECLARED_INLINE_P (newdecl)
1145 && DECL_UNINLINABLE (olddecl)
1146 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1148 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1150 warning (OPT_Wattributes, "previous declaration of %q+D "
1151 "with attribute noinline", olddecl);
1153 else if (DECL_DECLARED_INLINE_P (olddecl)
1154 && DECL_UNINLINABLE (newdecl)
1155 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1157 warning (OPT_Wattributes, "function %q+D redeclared with "
1158 "attribute noinline", newdecl);
1159 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1164 /* Check for redeclaration and other discrepancies. */
1165 if (TREE_CODE (olddecl) == FUNCTION_DECL
1166 && DECL_ARTIFICIAL (olddecl))
1168 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1169 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1171 /* Avoid warnings redeclaring built-ins which have not been
1172 explicitly declared. */
1173 if (DECL_ANTICIPATED (olddecl))
1176 /* If you declare a built-in or predefined function name as static,
1177 the old definition is overridden, but optionally warn this was a
1178 bad choice of name. */
1179 if (! TREE_PUBLIC (newdecl))
1181 warning (OPT_Wshadow, "shadowing %s function %q#D",
1182 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1184 /* Discard the old built-in function. */
1187 /* If the built-in is not ansi, then programs can override
1188 it even globally without an error. */
1189 else if (! DECL_BUILT_IN (olddecl))
1190 warning (0, "library function %q#D redeclared as non-function %q#D",
1194 error ("declaration of %q#D", newdecl);
1195 error ("conflicts with built-in declaration %q#D",
1200 else if (!types_match)
1202 /* Avoid warnings redeclaring built-ins which have not been
1203 explicitly declared. */
1204 if (DECL_ANTICIPATED (olddecl))
1206 /* Deal with fileptr_type_node. FILE type is not known
1207 at the time we create the builtins. */
1210 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1211 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1213 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1216 else if (TREE_VALUE (t2) == fileptr_type_node)
1218 tree t = TREE_VALUE (t1);
1220 if (TREE_CODE (t) == POINTER_TYPE
1221 && TYPE_NAME (TREE_TYPE (t))
1222 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1223 == get_identifier ("FILE")
1224 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1226 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1228 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1229 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1230 types_match = decls_match (newdecl, olddecl);
1232 return duplicate_decls (newdecl, olddecl,
1234 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1237 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1240 else if ((DECL_EXTERN_C_P (newdecl)
1241 && DECL_EXTERN_C_P (olddecl))
1242 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1243 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1245 /* A near match; override the builtin. */
1247 if (TREE_PUBLIC (newdecl))
1249 warning (0, "new declaration %q#D", newdecl);
1250 warning (0, "ambiguates built-in declaration %q#D",
1254 warning (OPT_Wshadow, "shadowing %s function %q#D",
1255 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1259 /* Discard the old built-in function. */
1262 /* Replace the old RTL to avoid problems with inlining. */
1263 COPY_DECL_RTL (newdecl, olddecl);
1265 /* Even if the types match, prefer the new declarations type for
1266 built-ins which have not been explicitly declared, for
1267 exception lists, etc... */
1268 else if (DECL_ANTICIPATED (olddecl))
1270 tree type = TREE_TYPE (newdecl);
1271 tree attribs = (*targetm.merge_type_attributes)
1272 (TREE_TYPE (olddecl), type);
1274 type = cp_build_type_attribute_variant (type, attribs);
1275 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1278 /* If a function is explicitly declared "throw ()", propagate that to
1279 the corresponding builtin. */
1280 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1281 && DECL_ANTICIPATED (olddecl)
1282 && TREE_NOTHROW (newdecl)
1283 && !TREE_NOTHROW (olddecl)
1284 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1285 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1287 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1289 /* Whether or not the builtin can throw exceptions has no
1290 bearing on this declarator. */
1291 TREE_NOTHROW (olddecl) = 0;
1293 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1295 /* If a builtin function is redeclared as `static', merge
1296 the declarations, but make the original one static. */
1297 DECL_THIS_STATIC (olddecl) = 1;
1298 TREE_PUBLIC (olddecl) = 0;
1300 /* Make the old declaration consistent with the new one so
1301 that all remnants of the builtin-ness of this function
1302 will be banished. */
1303 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1304 COPY_DECL_RTL (newdecl, olddecl);
1307 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1309 /* C++ Standard, 3.3, clause 4:
1310 "[Note: a namespace name or a class template name must be unique
1311 in its declarative region (7.3.2, clause 14). ]" */
1312 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1313 && TREE_CODE (newdecl) != NAMESPACE_DECL
1314 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1315 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1316 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1317 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1319 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1320 && TREE_CODE (newdecl) != TYPE_DECL)
1321 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1322 && TREE_CODE (olddecl) != TYPE_DECL))
1324 /* We do nothing special here, because C++ does such nasty
1325 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1326 get shadowed, and know that if we need to find a TYPE_DECL
1327 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1328 slot of the identifier. */
1332 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1333 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1334 || (TREE_CODE (olddecl) == FUNCTION_DECL
1335 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1339 error ("%q#D redeclared as different kind of symbol", newdecl);
1340 if (TREE_CODE (olddecl) == TREE_LIST)
1341 olddecl = TREE_VALUE (olddecl);
1342 error ("previous declaration of %q+#D", olddecl);
1344 return error_mark_node;
1346 else if (!types_match)
1348 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1349 /* These are certainly not duplicate declarations; they're
1350 from different scopes. */
1353 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1355 /* The name of a class template may not be declared to refer to
1356 any other template, class, function, object, namespace, value,
1357 or type in the same scope. */
1358 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1359 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1361 error ("declaration of template %q#D", newdecl);
1362 error ("conflicts with previous declaration %q+#D", olddecl);
1364 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1365 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1366 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1367 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1368 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1369 DECL_TEMPLATE_PARMS (olddecl))
1370 /* Template functions can be disambiguated by
1372 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1373 TREE_TYPE (TREE_TYPE (olddecl))))
1375 error ("new declaration %q#D", newdecl);
1376 error ("ambiguates old declaration %q+#D", olddecl);
1380 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1382 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1384 error ("declaration of C function %q#D conflicts with",
1386 error ("previous declaration %q+#D here", olddecl);
1388 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1389 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1391 error ("new declaration %q#D", newdecl);
1392 error ("ambiguates old declaration %q+#D", olddecl);
1393 return error_mark_node;
1400 error ("conflicting declaration %q#D", newdecl);
1401 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1402 return error_mark_node;
1405 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1406 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1407 && (!DECL_TEMPLATE_INFO (newdecl)
1408 || (DECL_TI_TEMPLATE (newdecl)
1409 != DECL_TI_TEMPLATE (olddecl))))
1410 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1411 && (!DECL_TEMPLATE_INFO (olddecl)
1412 || (DECL_TI_TEMPLATE (olddecl)
1413 != DECL_TI_TEMPLATE (newdecl))))))
1414 /* It's OK to have a template specialization and a non-template
1415 with the same type, or to have specializations of two
1416 different templates with the same type. Note that if one is a
1417 specialization, and the other is an instantiation of the same
1418 template, that we do not exit at this point. That situation
1419 can occur if we instantiate a template class, and then
1420 specialize one of its methods. This situation is valid, but
1421 the declarations must be merged in the usual way. */
1423 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1424 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1425 && !DECL_USE_TEMPLATE (newdecl))
1426 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1427 && !DECL_USE_TEMPLATE (olddecl))))
1428 /* One of the declarations is a template instantiation, and the
1429 other is not a template at all. That's OK. */
1431 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1433 /* In [namespace.alias] we have:
1435 In a declarative region, a namespace-alias-definition can be
1436 used to redefine a namespace-alias declared in that declarative
1437 region to refer only to the namespace to which it already
1440 Therefore, if we encounter a second alias directive for the same
1441 alias, we can just ignore the second directive. */
1442 if (DECL_NAMESPACE_ALIAS (newdecl)
1443 && (DECL_NAMESPACE_ALIAS (newdecl)
1444 == DECL_NAMESPACE_ALIAS (olddecl)))
1446 /* [namespace.alias]
1448 A namespace-name or namespace-alias shall not be declared as
1449 the name of any other entity in the same declarative region.
1450 A namespace-name defined at global scope shall not be
1451 declared as the name of any other entity in any global scope
1453 error ("declaration of namespace %qD conflicts with", newdecl);
1454 error ("previous declaration of namespace %q+D here", olddecl);
1455 return error_mark_node;
1459 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1462 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1463 if (DECL_NAME (olddecl) != NULL_TREE)
1464 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1465 ? "%q+#D previously defined here"
1466 : "%q+#D previously declared here", olddecl);
1467 return error_mark_node;
1469 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1470 && DECL_INITIAL (olddecl) != NULL_TREE
1471 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1472 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1474 /* Prototype decl follows defn w/o prototype. */
1475 warning (0, "prototype for %q+#D", newdecl);
1476 warning (0, "%Jfollows non-prototype definition here", olddecl);
1478 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1479 || TREE_CODE (olddecl) == VAR_DECL)
1480 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1483 If two declarations of the same function or object
1484 specify different linkage-specifications ..., the program
1485 is ill-formed.... Except for functions with C++ linkage,
1486 a function declaration without a linkage specification
1487 shall not precede the first linkage specification for
1488 that function. A function can be declared without a
1489 linkage specification after an explicit linkage
1490 specification has been seen; the linkage explicitly
1491 specified in the earlier declaration is not affected by
1492 such a function declaration.
1494 DR 563 raises the question why the restrictions on
1495 functions should not also apply to objects. Older
1496 versions of G++ silently ignore the linkage-specification
1504 which is clearly wrong. Therefore, we now treat objects
1506 if (current_lang_depth () == 0)
1508 /* There is no explicit linkage-specification, so we use
1509 the linkage from the previous declaration. */
1510 if (!DECL_LANG_SPECIFIC (newdecl))
1511 retrofit_lang_decl (newdecl);
1512 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1516 error ("previous declaration of %q+#D with %qL linkage",
1517 olddecl, DECL_LANGUAGE (olddecl));
1518 error ("conflicts with new declaration with %qL linkage",
1519 DECL_LANGUAGE (newdecl));
1523 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1525 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1527 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1528 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1531 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1532 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1534 for (; t1 && t1 != void_list_node;
1535 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1536 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1538 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1541 permerror (input_location, "default argument given for parameter %d of %q#D",
1543 permerror (input_location, "after previous specification in %q+#D", olddecl);
1547 error ("default argument given for parameter %d of %q#D",
1549 error ("after previous specification in %q+#D",
1556 /* Do not merge an implicit typedef with an explicit one. In:
1560 typedef class A A __attribute__ ((foo));
1562 the attribute should apply only to the typedef. */
1563 if (TREE_CODE (olddecl) == TYPE_DECL
1564 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1565 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1568 /* If new decl is `static' and an `extern' was seen previously,
1570 warn_extern_redeclared_static (newdecl, olddecl);
1572 /* We have committed to returning 1 at this point. */
1573 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1575 /* Now that functions must hold information normally held
1576 by field decls, there is extra work to do so that
1577 declaration information does not get destroyed during
1579 if (DECL_VINDEX (olddecl))
1580 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1581 if (DECL_CONTEXT (olddecl))
1582 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1583 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1584 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1585 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1586 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1587 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1588 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1589 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1590 SET_OVERLOADED_OPERATOR_CODE
1591 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1592 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1594 /* Optionally warn about more than one declaration for the same
1595 name, but don't warn about a function declaration followed by a
1597 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1598 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1599 /* Don't warn about extern decl followed by definition. */
1600 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1601 /* Don't warn about friends, let add_friend take care of it. */
1602 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1604 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1605 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1608 if (DECL_DELETED_FN (newdecl))
1610 error ("deleted definition of %qD", newdecl);
1611 error ("after previous declaration %q+D", olddecl);
1615 /* Deal with C++: must preserve virtual function table size. */
1616 if (TREE_CODE (olddecl) == TYPE_DECL)
1618 tree newtype = TREE_TYPE (newdecl);
1619 tree oldtype = TREE_TYPE (olddecl);
1621 if (newtype != error_mark_node && oldtype != error_mark_node
1622 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1623 CLASSTYPE_FRIEND_CLASSES (newtype)
1624 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1626 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1629 /* Copy all the DECL_... slots specified in the new decl
1630 except for any that we copy here from the old type. */
1631 DECL_ATTRIBUTES (newdecl)
1632 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1634 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1638 old_result = DECL_TEMPLATE_RESULT (olddecl);
1639 new_result = DECL_TEMPLATE_RESULT (newdecl);
1640 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1641 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1642 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1643 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1645 DECL_ATTRIBUTES (old_result)
1646 = (*targetm.merge_decl_attributes) (old_result, new_result);
1648 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1650 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1651 && DECL_INITIAL (new_result))
1653 if (DECL_INITIAL (old_result))
1654 DECL_UNINLINABLE (old_result) = 1;
1656 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1657 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1658 DECL_NOT_REALLY_EXTERN (old_result)
1659 = DECL_NOT_REALLY_EXTERN (new_result);
1660 DECL_INTERFACE_KNOWN (old_result)
1661 = DECL_INTERFACE_KNOWN (new_result);
1662 DECL_DECLARED_INLINE_P (old_result)
1663 = DECL_DECLARED_INLINE_P (new_result);
1664 DECL_DISREGARD_INLINE_LIMITS (old_result)
1665 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1670 DECL_DECLARED_INLINE_P (old_result)
1671 |= DECL_DECLARED_INLINE_P (new_result);
1672 DECL_DISREGARD_INLINE_LIMITS (old_result)
1673 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1674 check_redeclaration_exception_specification (newdecl, olddecl);
1678 /* If the new declaration is a definition, update the file and
1679 line information on the declaration, and also make
1680 the old declaration the same definition. */
1681 if (DECL_INITIAL (new_result) != NULL_TREE)
1683 DECL_SOURCE_LOCATION (olddecl)
1684 = DECL_SOURCE_LOCATION (old_result)
1685 = DECL_SOURCE_LOCATION (newdecl);
1686 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1687 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1688 DECL_ARGUMENTS (old_result)
1689 = DECL_ARGUMENTS (new_result);
1697 /* Automatically handles default parameters. */
1698 tree oldtype = TREE_TYPE (olddecl);
1701 /* Merge the data types specified in the two decls. */
1702 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1704 /* If merge_types produces a non-typedef type, just use the old type. */
1705 if (TREE_CODE (newdecl) == TYPE_DECL
1706 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1709 if (TREE_CODE (newdecl) == VAR_DECL)
1711 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1712 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1713 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1714 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1715 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1716 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1718 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1719 if (DECL_LANG_SPECIFIC (olddecl)
1720 && CP_DECL_THREADPRIVATE_P (olddecl))
1722 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1723 if (!DECL_LANG_SPECIFIC (newdecl))
1724 retrofit_lang_decl (newdecl);
1726 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1727 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1731 /* Do this after calling `merge_types' so that default
1732 parameters don't confuse us. */
1733 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1734 check_redeclaration_exception_specification (newdecl, olddecl);
1735 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1737 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1738 check_default_args (newdecl);
1740 /* Lay the type out, unless already done. */
1741 if (! same_type_p (newtype, oldtype)
1742 && TREE_TYPE (newdecl) != error_mark_node
1743 && !(processing_template_decl && uses_template_parms (newdecl)))
1744 layout_type (TREE_TYPE (newdecl));
1746 if ((TREE_CODE (newdecl) == VAR_DECL
1747 || TREE_CODE (newdecl) == PARM_DECL
1748 || TREE_CODE (newdecl) == RESULT_DECL
1749 || TREE_CODE (newdecl) == FIELD_DECL
1750 || TREE_CODE (newdecl) == TYPE_DECL)
1751 && !(processing_template_decl && uses_template_parms (newdecl)))
1752 layout_decl (newdecl, 0);
1754 /* Merge the type qualifiers. */
1755 if (TREE_READONLY (newdecl))
1756 TREE_READONLY (olddecl) = 1;
1757 if (TREE_THIS_VOLATILE (newdecl))
1758 TREE_THIS_VOLATILE (olddecl) = 1;
1759 if (TREE_NOTHROW (newdecl))
1760 TREE_NOTHROW (olddecl) = 1;
1762 /* Merge deprecatedness. */
1763 if (TREE_DEPRECATED (newdecl))
1764 TREE_DEPRECATED (olddecl) = 1;
1766 /* Preserve function specific target and optimization options */
1767 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1769 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1770 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1771 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1772 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1774 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1775 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1776 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1777 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1780 /* Merge the initialization information. */
1781 if (DECL_INITIAL (newdecl) == NULL_TREE
1782 && DECL_INITIAL (olddecl) != NULL_TREE)
1784 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1785 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1786 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1787 && DECL_LANG_SPECIFIC (newdecl)
1788 && DECL_LANG_SPECIFIC (olddecl))
1790 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1791 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1795 /* Merge the section attribute.
1796 We want to issue an error if the sections conflict but that must be
1797 done later in decl_attributes since we are called before attributes
1799 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1800 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1802 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1804 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1805 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1806 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1807 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1808 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1809 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1810 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1811 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1812 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1813 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1814 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1815 /* Keep the old RTL. */
1816 COPY_DECL_RTL (olddecl, newdecl);
1818 else if (TREE_CODE (newdecl) == VAR_DECL
1819 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1821 /* Keep the old RTL. We cannot keep the old RTL if the old
1822 declaration was for an incomplete object and the new
1823 declaration is not since many attributes of the RTL will
1825 COPY_DECL_RTL (olddecl, newdecl);
1828 /* If cannot merge, then use the new type and qualifiers,
1829 and don't preserve the old rtl. */
1832 /* Clean out any memory we had of the old declaration. */
1833 tree oldstatic = value_member (olddecl, static_aggregates);
1835 TREE_VALUE (oldstatic) = error_mark_node;
1837 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1838 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1839 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1840 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1843 /* Merge the storage class information. */
1844 merge_weak (newdecl, olddecl);
1846 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1847 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1848 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1849 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1850 if (! DECL_EXTERNAL (olddecl))
1851 DECL_EXTERNAL (newdecl) = 0;
1853 new_template = NULL_TREE;
1854 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1856 bool new_redefines_gnu_inline = false;
1858 if (new_defines_function
1859 && ((DECL_INTERFACE_KNOWN (olddecl)
1860 && TREE_CODE (olddecl) == FUNCTION_DECL)
1861 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1862 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1863 == FUNCTION_DECL))))
1867 if (TREE_CODE (fn) == TEMPLATE_DECL)
1868 fn = DECL_TEMPLATE_RESULT (olddecl);
1870 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1873 if (!new_redefines_gnu_inline)
1875 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1876 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1877 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1879 DECL_TEMPLATE_INSTANTIATED (newdecl)
1880 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1882 /* If the OLDDECL is an instantiation and/or specialization,
1883 then the NEWDECL must be too. But, it may not yet be marked
1884 as such if the caller has created NEWDECL, but has not yet
1885 figured out that it is a redeclaration. */
1886 if (!DECL_USE_TEMPLATE (newdecl))
1887 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1889 /* Don't really know how much of the language-specific
1890 values we should copy from old to new. */
1891 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1892 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1893 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1894 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1895 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1896 if (DECL_TEMPLATE_INFO (newdecl))
1897 new_template = DECL_TI_TEMPLATE (newdecl);
1898 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1899 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1900 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1901 olddecl_friend = DECL_FRIEND_P (olddecl);
1902 hidden_friend = (DECL_ANTICIPATED (olddecl)
1903 && DECL_HIDDEN_FRIEND_P (olddecl)
1904 && newdecl_is_friend);
1906 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1907 if (TREE_CODE (newdecl) == FUNCTION_DECL
1908 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1910 DECL_BEFRIENDING_CLASSES (newdecl)
1911 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1912 DECL_BEFRIENDING_CLASSES (olddecl));
1913 /* DECL_THUNKS is only valid for virtual functions,
1914 otherwise it is a DECL_FRIEND_CONTEXT. */
1915 if (DECL_VIRTUAL_P (newdecl))
1916 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1920 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1922 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1923 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1925 /* If newdecl is not a specialization, then it is not a
1926 template-related function at all. And that means that we
1927 should have exited above, returning 0. */
1928 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1930 if (TREE_USED (olddecl))
1931 /* From [temp.expl.spec]:
1933 If a template, a member template or the member of a class
1934 template is explicitly specialized then that
1935 specialization shall be declared before the first use of
1936 that specialization that would cause an implicit
1937 instantiation to take place, in every translation unit in
1938 which such a use occurs. */
1939 error ("explicit specialization of %qD after first use",
1942 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1944 /* Don't propagate visibility from the template to the
1945 specialization here. We'll do that in determine_visibility if
1947 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1949 /* [temp.expl.spec/14] We don't inline explicit specialization
1950 just because the primary template says so. */
1952 else if (new_defines_function && DECL_INITIAL (olddecl))
1954 /* Never inline re-defined extern inline functions.
1955 FIXME: this could be better handled by keeping both
1956 function as separate declarations. */
1957 DECL_UNINLINABLE (newdecl) = 1;
1961 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1962 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1964 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1966 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1967 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1969 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1970 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1971 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1972 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1975 /* Preserve abstractness on cloned [cd]tors. */
1976 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1980 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1981 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1982 COPY_DECL_RTL (newdecl, olddecl);
1984 if (! types_match || new_defines_function)
1986 /* These need to be copied so that the names are available.
1987 Note that if the types do match, we'll preserve inline
1988 info and other bits, but if not, we won't. */
1989 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1990 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1992 if (new_defines_function)
1993 /* If defining a function declared with other language
1994 linkage, use the previously declared language linkage. */
1995 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1996 else if (types_match)
1998 /* If redeclaring a builtin function, and not a definition,
1999 it stays built in. */
2000 if (DECL_BUILT_IN (olddecl))
2002 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2003 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2004 /* If we're keeping the built-in definition, keep the rtl,
2005 regardless of declaration matches. */
2006 COPY_DECL_RTL (olddecl, newdecl);
2009 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2010 /* Don't clear out the arguments if we're redefining a function. */
2011 if (DECL_ARGUMENTS (olddecl))
2012 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2015 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2016 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2018 /* Now preserve various other info from the definition. */
2019 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2020 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2021 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2022 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2024 /* Warn about conflicting visibility specifications. */
2025 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2026 && DECL_VISIBILITY_SPECIFIED (newdecl)
2027 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2029 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2030 "because it", newdecl);
2031 warning (OPT_Wattributes, "%Jconflicts with previous "
2032 "declaration here", olddecl);
2034 /* Choose the declaration which specified visibility. */
2035 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2037 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2038 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2040 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2041 so keep this behavior. */
2042 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2044 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2045 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2048 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2049 with that from NEWDECL below. */
2050 if (DECL_LANG_SPECIFIC (olddecl))
2052 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2053 != DECL_LANG_SPECIFIC (newdecl));
2054 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2057 /* Merge the USED information. */
2058 if (TREE_USED (olddecl))
2059 TREE_USED (newdecl) = 1;
2060 else if (TREE_USED (newdecl))
2061 TREE_USED (olddecl) = 1;
2063 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2067 function_size = sizeof (struct tree_decl_common);
2069 memcpy ((char *) olddecl + sizeof (struct tree_common),
2070 (char *) newdecl + sizeof (struct tree_common),
2071 function_size - sizeof (struct tree_common));
2073 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2074 (char *) newdecl + sizeof (struct tree_decl_common),
2075 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2077 /* If newdecl is a template instantiation, it is possible that
2078 the following sequence of events has occurred:
2080 o A friend function was declared in a class template. The
2081 class template was instantiated.
2083 o The instantiation of the friend declaration was
2084 recorded on the instantiation list, and is newdecl.
2086 o Later, however, instantiate_class_template called pushdecl
2087 on the newdecl to perform name injection. But, pushdecl in
2088 turn called duplicate_decls when it discovered that another
2089 declaration of a global function with the same name already
2092 o Here, in duplicate_decls, we decided to clobber newdecl.
2094 If we're going to do that, we'd better make sure that
2095 olddecl, and not newdecl, is on the list of
2096 instantiations so that if we try to do the instantiation
2097 again we won't get the clobbered declaration. */
2098 reregister_specialization (newdecl,
2104 size_t size = tree_code_size (TREE_CODE (olddecl));
2105 memcpy ((char *) olddecl + sizeof (struct tree_common),
2106 (char *) newdecl + sizeof (struct tree_common),
2107 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2108 switch (TREE_CODE (olddecl))
2118 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2119 (char *) newdecl + sizeof (struct tree_decl_common),
2120 size - sizeof (struct tree_decl_common)
2121 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2125 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2126 (char *) newdecl + sizeof (struct tree_decl_common),
2127 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2128 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2132 DECL_UID (olddecl) = olddecl_uid;
2134 DECL_FRIEND_P (olddecl) = 1;
2137 DECL_ANTICIPATED (olddecl) = 1;
2138 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2141 /* NEWDECL contains the merged attribute lists.
2142 Update OLDDECL to be the same. */
2143 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2145 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2146 so that encode_section_info has a chance to look at the new decl
2147 flags and attributes. */
2148 if (DECL_RTL_SET_P (olddecl)
2149 && (TREE_CODE (olddecl) == FUNCTION_DECL
2150 || (TREE_CODE (olddecl) == VAR_DECL
2151 && TREE_STATIC (olddecl))))
2152 make_decl_rtl (olddecl);
2154 /* The NEWDECL will no longer be needed. Because every out-of-class
2155 declaration of a member results in a call to duplicate_decls,
2156 freeing these nodes represents in a significant savings. */
2162 /* Return zero if the declaration NEWDECL is valid
2163 when the declaration OLDDECL (assumed to be for the same name)
2164 has already been seen.
2165 Otherwise return an error message format string with a %s
2166 where the identifier should go. */
2169 redeclaration_error_message (tree newdecl, tree olddecl)
2171 if (TREE_CODE (newdecl) == TYPE_DECL)
2173 /* Because C++ can put things into name space for free,
2174 constructs like "typedef struct foo { ... } foo"
2175 would look like an erroneous redeclaration. */
2176 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2179 return "redefinition of %q#D";
2181 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2183 /* If this is a pure function, its olddecl will actually be
2184 the original initialization to `0' (which we force to call
2185 abort()). Don't complain about redefinition in this case. */
2186 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2187 && DECL_INITIAL (olddecl) == NULL_TREE)
2190 /* If both functions come from different namespaces, this is not
2191 a redeclaration - this is a conflict with a used function. */
2192 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2193 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2194 && ! decls_match (olddecl, newdecl))
2195 return "%qD conflicts with used function";
2197 /* We'll complain about linkage mismatches in
2198 warn_extern_redeclared_static. */
2200 /* Defining the same name twice is no good. */
2201 if (DECL_INITIAL (olddecl) != NULL_TREE
2202 && DECL_INITIAL (newdecl) != NULL_TREE)
2204 if (DECL_NAME (olddecl) == NULL_TREE)
2205 return "%q#D not declared in class";
2206 else if (!GNU_INLINE_P (olddecl)
2207 || GNU_INLINE_P (newdecl))
2208 return "redefinition of %q#D";
2211 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2213 bool olda = GNU_INLINE_P (olddecl);
2214 bool newa = GNU_INLINE_P (newdecl);
2219 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2221 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2227 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2231 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2233 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2234 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2235 return "redefinition of %q#D";
2239 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2240 || (DECL_TEMPLATE_RESULT (newdecl)
2241 == DECL_TEMPLATE_RESULT (olddecl)))
2244 nt = DECL_TEMPLATE_RESULT (newdecl);
2245 if (DECL_TEMPLATE_INFO (nt))
2246 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2247 ot = DECL_TEMPLATE_RESULT (olddecl);
2248 if (DECL_TEMPLATE_INFO (ot))
2249 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2250 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2251 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2252 return "redefinition of %q#D";
2254 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2256 bool olda = GNU_INLINE_P (ot);
2257 bool newa = GNU_INLINE_P (nt);
2262 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2264 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2268 /* Core issue #226 (C++0x):
2270 If a friend function template declaration specifies a
2271 default template-argument, that declaration shall be a
2272 definition and shall be the only declaration of the
2273 function template in the translation unit. */
2274 if ((cxx_dialect != cxx98)
2275 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2276 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2277 /*is_primary=*/1, /*is_partial=*/0,
2278 /*is_friend_decl=*/2))
2279 return "redeclaration of friend %q#D may not have default template arguments";
2283 else if (TREE_CODE (newdecl) == VAR_DECL
2284 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2285 && (! DECL_LANG_SPECIFIC (olddecl)
2286 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2287 || DECL_THREAD_LOCAL_P (newdecl)))
2289 /* Only variables can be thread-local, and all declarations must
2290 agree on this property. */
2291 if (DECL_THREAD_LOCAL_P (newdecl))
2292 return "thread-local declaration of %q#D follows "
2293 "non-thread-local declaration";
2295 return "non-thread-local declaration of %q#D follows "
2296 "thread-local declaration";
2298 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2300 /* The objects have been declared at namespace scope. If either
2301 is a member of an anonymous union, then this is an invalid
2302 redeclaration. For example:
2308 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2309 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2310 return "redeclaration of %q#D";
2311 /* If at least one declaration is a reference, there is no
2312 conflict. For example:
2318 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2320 /* Reject two definitions. */
2321 return "redefinition of %q#D";
2325 /* Objects declared with block scope: */
2326 /* Reject two definitions, and reject a definition
2327 together with an external reference. */
2328 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2329 return "redeclaration of %q#D";
2334 /* Hash and equality functions for the named_label table. */
2337 named_label_entry_hash (const void *data)
2339 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2340 return DECL_UID (ent->label_decl);
2344 named_label_entry_eq (const void *a, const void *b)
2346 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2347 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2348 return ent_a->label_decl == ent_b->label_decl;
2351 /* Create a new label, named ID. */
2354 make_label_decl (tree id, int local_p)
2356 struct named_label_entry *ent;
2360 decl = build_decl (LABEL_DECL, id, void_type_node);
2362 DECL_CONTEXT (decl) = current_function_decl;
2363 DECL_MODE (decl) = VOIDmode;
2364 C_DECLARED_LABEL_FLAG (decl) = local_p;
2366 /* Say where one reference is to the label, for the sake of the
2367 error if it is not defined. */
2368 DECL_SOURCE_LOCATION (decl) = input_location;
2370 /* Record the fact that this identifier is bound to this label. */
2371 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2373 /* Create the label htab for the function on demand. */
2375 named_labels = htab_create_ggc (13, named_label_entry_hash,
2376 named_label_entry_eq, NULL);
2378 /* Record this label on the list of labels used in this function.
2379 We do this before calling make_label_decl so that we get the
2380 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2381 ent = GGC_CNEW (struct named_label_entry);
2382 ent->label_decl = decl;
2384 slot = htab_find_slot (named_labels, ent, INSERT);
2385 gcc_assert (*slot == NULL);
2391 /* Look for a label named ID in the current function. If one cannot
2392 be found, create one. (We keep track of used, but undefined,
2393 labels, and complain about them at the end of a function.) */
2396 lookup_label (tree id)
2400 timevar_push (TV_NAME_LOOKUP);
2401 /* You can't use labels at global scope. */
2402 if (current_function_decl == NULL_TREE)
2404 error ("label %qE referenced outside of any function", id);
2405 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2408 /* See if we've already got this label. */
2409 decl = IDENTIFIER_LABEL_VALUE (id);
2410 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2411 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2413 decl = make_label_decl (id, /*local_p=*/0);
2414 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2417 /* Declare a local label named ID. */
2420 declare_local_label (tree id)
2424 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2425 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2426 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2427 current_binding_level->shadowed_labels);
2428 current_binding_level->shadowed_labels = shadow;
2430 decl = make_label_decl (id, /*local_p=*/1);
2431 TREE_VALUE (shadow) = decl;
2436 /* Returns nonzero if it is ill-formed to jump past the declaration of
2437 DECL. Returns 2 if it's also a real problem. */
2440 decl_jump_unsafe (tree decl)
2442 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2443 || TREE_TYPE (decl) == error_mark_node)
2446 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2447 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2450 if (pod_type_p (TREE_TYPE (decl)))
2453 /* The POD stuff is just pedantry; why should it matter if the class
2454 contains a field of pointer to member type? */
2458 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2461 identify_goto (tree decl, const location_t *locus)
2464 permerror (input_location, "jump to label %qD", decl);
2466 permerror (input_location, "jump to case label");
2468 permerror (input_location, "%H from here", locus);
2471 /* Check that a single previously seen jump to a newly defined label
2472 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2473 the jump context; NAMES are the names in scope in LEVEL at the jump
2474 context; LOCUS is the source position of the jump or 0. Returns
2475 true if all is well. */
2478 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2479 bool exited_omp, const location_t *locus)
2481 struct cp_binding_level *b;
2482 bool identified = false, saw_eh = false, saw_omp = false;
2486 identify_goto (decl, locus);
2487 error (" exits OpenMP structured block");
2488 identified = saw_omp = true;
2491 for (b = current_binding_level; b ; b = b->level_chain)
2493 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2495 for (new_decls = b->names; new_decls != old_decls;
2496 new_decls = TREE_CHAIN (new_decls))
2498 int problem = decl_jump_unsafe (new_decls);
2504 identify_goto (decl, locus);
2508 error (" crosses initialization of %q+#D", new_decls);
2510 permerror (input_location, " enters scope of non-POD %q+#D", new_decls);
2515 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2519 identify_goto (decl, locus);
2522 if (b->kind == sk_try)
2523 error (" enters try block");
2525 error (" enters catch block");
2528 if (b->kind == sk_omp && !saw_omp)
2532 identify_goto (decl, locus);
2535 error (" enters OpenMP structured block");
2544 check_previous_goto (tree decl, struct named_label_use_entry *use)
2546 check_previous_goto_1 (decl, use->binding_level,
2547 use->names_in_scope, use->in_omp_scope,
2548 &use->o_goto_locus);
2552 check_switch_goto (struct cp_binding_level* level)
2554 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2557 /* Check that a new jump to a label DECL is OK. Called by
2558 finish_goto_stmt. */
2561 check_goto (tree decl)
2563 struct named_label_entry *ent, dummy;
2564 bool saw_catch = false, identified = false;
2567 /* We can't know where a computed goto is jumping.
2568 So we assume that it's OK. */
2569 if (TREE_CODE (decl) != LABEL_DECL)
2572 /* We didn't record any information about this label when we created it,
2573 and there's not much point since it's trivial to analyze as a return. */
2574 if (decl == cdtor_label)
2577 dummy.label_decl = decl;
2578 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2579 gcc_assert (ent != NULL);
2581 /* If the label hasn't been defined yet, defer checking. */
2582 if (! DECL_INITIAL (decl))
2584 struct named_label_use_entry *new_use;
2586 /* Don't bother creating another use if the last goto had the
2587 same data, and will therefore create the same set of errors. */
2589 && ent->uses->names_in_scope == current_binding_level->names)
2592 new_use = GGC_NEW (struct named_label_use_entry);
2593 new_use->binding_level = current_binding_level;
2594 new_use->names_in_scope = current_binding_level->names;
2595 new_use->o_goto_locus = input_location;
2596 new_use->in_omp_scope = false;
2598 new_use->next = ent->uses;
2599 ent->uses = new_use;
2603 if (ent->in_try_scope || ent->in_catch_scope
2604 || ent->in_omp_scope || ent->bad_decls)
2606 permerror (input_location, "jump to label %q+D", decl);
2607 permerror (input_location, " from here");
2611 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2613 tree b = TREE_VALUE (bad);
2614 int u = decl_jump_unsafe (b);
2616 if (u > 1 && DECL_ARTIFICIAL (b))
2618 /* Can't skip init of __exception_info. */
2619 error ("%J enters catch block", b);
2623 error (" skips initialization of %q+#D", b);
2625 permerror (input_location, " enters scope of non-POD %q+#D", b);
2628 if (ent->in_try_scope)
2629 error (" enters try block");
2630 else if (ent->in_catch_scope && !saw_catch)
2631 error (" enters catch block");
2633 if (ent->in_omp_scope)
2634 error (" enters OpenMP structured block");
2635 else if (flag_openmp)
2637 struct cp_binding_level *b;
2638 for (b = current_binding_level; b ; b = b->level_chain)
2640 if (b == ent->binding_level)
2642 if (b->kind == sk_omp)
2646 permerror (input_location, "jump to label %q+D", decl);
2647 permerror (input_location, " from here");
2650 error (" exits OpenMP structured block");
2657 /* Check that a return is ok wrt OpenMP structured blocks.
2658 Called by finish_return_stmt. Returns true if all is well. */
2661 check_omp_return (void)
2663 struct cp_binding_level *b;
2664 for (b = current_binding_level; b ; b = b->level_chain)
2665 if (b->kind == sk_omp)
2667 error ("invalid exit from OpenMP structured block");
2673 /* Define a label, specifying the location in the source file.
2674 Return the LABEL_DECL node for the label. */
2677 define_label (location_t location, tree name)
2679 struct named_label_entry *ent, dummy;
2680 struct cp_binding_level *p;
2683 timevar_push (TV_NAME_LOOKUP);
2685 decl = lookup_label (name);
2687 dummy.label_decl = decl;
2688 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2689 gcc_assert (ent != NULL);
2691 /* After labels, make any new cleanups in the function go into their
2692 own new (temporary) binding contour. */
2693 for (p = current_binding_level;
2694 p->kind != sk_function_parms;
2696 p->more_cleanups_ok = 0;
2698 if (name == get_identifier ("wchar_t"))
2699 permerror (input_location, "label named wchar_t");
2701 if (DECL_INITIAL (decl) != NULL_TREE)
2703 error ("duplicate label %qD", decl);
2704 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2708 struct named_label_use_entry *use;
2710 /* Mark label as having been defined. */
2711 DECL_INITIAL (decl) = error_mark_node;
2712 /* Say where in the source. */
2713 DECL_SOURCE_LOCATION (decl) = location;
2715 ent->binding_level = current_binding_level;
2716 ent->names_in_scope = current_binding_level->names;
2718 for (use = ent->uses; use ; use = use->next)
2719 check_previous_goto (decl, use);
2723 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2728 struct cp_binding_level *level;
2729 struct cp_switch *next;
2730 /* The SWITCH_STMT being built. */
2732 /* A splay-tree mapping the low element of a case range to the high
2733 element, or NULL_TREE if there is no high element. Used to
2734 determine whether or not a new case label duplicates an old case
2735 label. We need a tree, rather than simply a hash table, because
2736 of the GNU case range extension. */
2740 /* A stack of the currently active switch statements. The innermost
2741 switch statement is on the top of the stack. There is no need to
2742 mark the stack for garbage collection because it is only active
2743 during the processing of the body of a function, and we never
2744 collect at that point. */
2746 static struct cp_switch *switch_stack;
2748 /* Called right after a switch-statement condition is parsed.
2749 SWITCH_STMT is the switch statement being parsed. */
2752 push_switch (tree switch_stmt)
2754 struct cp_switch *p = XNEW (struct cp_switch);
2755 p->level = current_binding_level;
2756 p->next = switch_stack;
2757 p->switch_stmt = switch_stmt;
2758 p->cases = splay_tree_new (case_compare, NULL, NULL);
2765 struct cp_switch *cs = switch_stack;
2766 location_t switch_location;
2768 /* Emit warnings as needed. */
2769 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2770 switch_location = EXPR_LOCATION (cs->switch_stmt);
2772 switch_location = input_location;
2773 if (!processing_template_decl)
2774 c_do_switch_warnings (cs->cases, switch_location,
2775 SWITCH_STMT_TYPE (cs->switch_stmt),
2776 SWITCH_STMT_COND (cs->switch_stmt));
2778 splay_tree_delete (cs->cases);
2779 switch_stack = switch_stack->next;
2783 /* Note that we've seen a definition of a case label, and complain if this
2784 is a bad place for one. */
2787 finish_case_label (tree low_value, tree high_value)
2790 struct cp_binding_level *p;
2792 if (processing_template_decl)
2796 /* For templates, just add the case label; we'll do semantic
2797 analysis at instantiation-time. */
2798 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2799 return add_stmt (build_case_label (low_value, high_value, label));
2802 /* Find the condition on which this switch statement depends. */
2803 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2804 if (cond && TREE_CODE (cond) == TREE_LIST)
2805 cond = TREE_VALUE (cond);
2807 if (!check_switch_goto (switch_stack->level))
2808 return error_mark_node;
2810 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2811 low_value, high_value);
2813 /* After labels, make any new cleanups in the function go into their
2814 own new (temporary) binding contour. */
2815 for (p = current_binding_level;
2816 p->kind != sk_function_parms;
2818 p->more_cleanups_ok = 0;
2823 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2826 typename_hash (const void* k)
2829 const_tree const t = (const_tree) k;
2831 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2832 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2837 typedef struct typename_info {
2845 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2846 really of type `typename_info*' */
2849 typename_compare (const void * k1, const void * k2)
2851 const_tree const t1 = (const_tree) k1;
2852 const typename_info *const t2 = (const typename_info *) k2;
2854 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2855 && TYPE_CONTEXT (t1) == t2->scope
2856 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2857 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2858 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2861 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2862 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2864 Returns the new TYPENAME_TYPE. */
2866 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2869 build_typename_type (tree context, tree name, tree fullname,
2870 enum tag_types tag_type)
2878 if (typename_htab == NULL)
2879 typename_htab = htab_create_ggc (61, &typename_hash,
2880 &typename_compare, NULL);
2882 ti.scope = FROB_CONTEXT (context);
2884 ti.template_id = fullname;
2885 ti.enum_p = tag_type == enum_type;
2886 ti.class_p = (tag_type == class_type
2887 || tag_type == record_type
2888 || tag_type == union_type);
2889 hash = (htab_hash_pointer (ti.scope)
2890 ^ htab_hash_pointer (ti.name));
2892 /* See if we already have this type. */
2893 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2898 /* Build the TYPENAME_TYPE. */
2899 t = cxx_make_type (TYPENAME_TYPE);
2900 TYPE_CONTEXT (t) = ti.scope;
2901 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2902 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2903 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2905 /* Build the corresponding TYPE_DECL. */
2906 d = build_decl (TYPE_DECL, name, t);
2907 TYPE_NAME (TREE_TYPE (d)) = d;
2908 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2909 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2910 DECL_ARTIFICIAL (d) = 1;
2912 /* Store it in the hash table. */
2915 /* TYPENAME_TYPEs must always be compared structurally, because
2916 they may or may not resolve down to another type depending on
2917 the currently open classes. */
2918 SET_TYPE_STRUCTURAL_EQUALITY (t);
2924 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2925 provided to name the type. Returns an appropriate type, unless an
2926 error occurs, in which case error_mark_node is returned. If we
2927 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2928 return that, rather than the _TYPE it corresponds to, in other
2929 cases we look through the type decl. If TF_ERROR is set, complain
2930 about errors, otherwise be quiet. */
2933 make_typename_type (tree context, tree name, enum tag_types tag_type,
2934 tsubst_flags_t complain)
2940 if (name == error_mark_node
2941 || context == NULL_TREE
2942 || context == error_mark_node)
2943 return error_mark_node;
2947 if (!(TYPE_LANG_SPECIFIC (name)
2948 && (CLASSTYPE_IS_TEMPLATE (name)
2949 || CLASSTYPE_USE_TEMPLATE (name))))
2950 name = TYPE_IDENTIFIER (name);
2952 /* Create a TEMPLATE_ID_EXPR for the type. */
2953 name = build_nt (TEMPLATE_ID_EXPR,
2954 CLASSTYPE_TI_TEMPLATE (name),
2955 CLASSTYPE_TI_ARGS (name));
2957 else if (TREE_CODE (name) == TYPE_DECL)
2958 name = DECL_NAME (name);
2962 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2964 name = TREE_OPERAND (name, 0);
2965 if (TREE_CODE (name) == TEMPLATE_DECL)
2966 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2967 else if (TREE_CODE (name) == OVERLOAD)
2969 error ("%qD is not a type", name);
2970 return error_mark_node;
2973 if (TREE_CODE (name) == TEMPLATE_DECL)
2975 error ("%qD used without template parameters", name);
2976 return error_mark_node;
2978 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2979 gcc_assert (TYPE_P (context));
2981 /* When the CONTEXT is a dependent type, NAME could refer to a
2982 dependent base class of CONTEXT. So we cannot peek inside it,
2983 even if CONTEXT is a currently open scope. */
2984 if (dependent_type_p (context))
2985 return build_typename_type (context, name, fullname, tag_type);
2987 if (!MAYBE_CLASS_TYPE_P (context))
2989 if (complain & tf_error)
2990 error ("%q#T is not a class", context);
2991 return error_mark_node;
2994 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2996 /* We should only set WANT_TYPE when we're a nested typename type.
2997 Then we can give better diagnostics if we find a non-type. */
2998 t = lookup_field (context, name, 0, /*want_type=*/true);
3001 if (complain & tf_error)
3002 error (want_template ? "no class template named %q#T in %q#T"
3003 : "no type named %q#T in %q#T", name, context);
3004 return error_mark_node;
3007 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3009 if (complain & tf_error)
3010 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3012 return error_mark_node;
3014 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3016 if (complain & tf_error)
3017 error ("%<typename %T::%D%> names %q#T, which is not a type",
3019 return error_mark_node;
3022 if (complain & tf_error)
3023 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3026 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3028 /*entering_scope=*/0,
3029 tf_warning_or_error | tf_user);
3031 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3037 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3038 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3039 in which case error_mark_node is returned.
3041 If PARM_LIST is non-NULL, also make sure that the template parameter
3042 list of TEMPLATE_DECL matches.
3044 If COMPLAIN zero, don't complain about any errors that occur. */
3047 make_unbound_class_template (tree context, tree name, tree parm_list,
3048 tsubst_flags_t complain)
3054 name = TYPE_IDENTIFIER (name);
3055 else if (DECL_P (name))
3056 name = DECL_NAME (name);
3057 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3059 if (!dependent_type_p (context)
3060 || currently_open_class (context))
3062 tree tmpl = NULL_TREE;
3064 if (MAYBE_CLASS_TYPE_P (context))
3065 tmpl = lookup_field (context, name, 0, false);
3067 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3069 if (complain & tf_error)
3070 error ("no class template named %q#T in %q#T", name, context);
3071 return error_mark_node;
3075 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3077 if (complain & tf_error)
3079 error ("template parameters do not match template");
3080 error ("%q+D declared here", tmpl);
3082 return error_mark_node;
3085 if (complain & tf_error)
3086 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3091 /* Build the UNBOUND_CLASS_TEMPLATE. */
3092 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3093 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3094 TREE_TYPE (t) = NULL_TREE;
3095 SET_TYPE_STRUCTURAL_EQUALITY (t);
3097 /* Build the corresponding TEMPLATE_DECL. */
3098 d = build_decl (TEMPLATE_DECL, name, t);
3099 TYPE_NAME (TREE_TYPE (d)) = d;
3100 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3101 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3102 DECL_ARTIFICIAL (d) = 1;
3103 DECL_TEMPLATE_PARMS (d) = parm_list;
3110 /* Push the declarations of builtin types into the namespace.
3111 RID_INDEX is the index of the builtin type in the array
3112 RID_POINTERS. NAME is the name used when looking up the builtin
3113 type. TYPE is the _TYPE node for the builtin type. */
3116 record_builtin_type (enum rid rid_index,
3120 tree rname = NULL_TREE, tname = NULL_TREE;
3121 tree tdecl = NULL_TREE;
3123 if ((int) rid_index < (int) RID_MAX)
3124 rname = ridpointers[(int) rid_index];
3126 tname = get_identifier (name);
3128 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3129 eliminated. Built-in types should not be looked up name; their
3130 names are keywords that the parser can recognize. However, there
3131 is code in c-common.c that uses identifier_global_value to look
3132 up built-in types by name. */
3135 tdecl = build_decl (TYPE_DECL, tname, type);
3136 DECL_ARTIFICIAL (tdecl) = 1;
3137 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3143 tdecl = build_decl (TYPE_DECL, rname, type);
3144 DECL_ARTIFICIAL (tdecl) = 1;
3146 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3149 if (!TYPE_NAME (type))
3150 TYPE_NAME (type) = tdecl;
3153 debug_hooks->type_decl (tdecl, 0);
3156 /* Record one of the standard Java types.
3157 * Declare it as having the given NAME.
3158 * If SIZE > 0, it is the size of one of the integral types;
3159 * otherwise it is the negative of the size of one of the other types. */
3162 record_builtin_java_type (const char* name, int size)
3166 type = make_signed_type (size);
3167 else if (size > -32)
3168 { /* "__java_char" or ""__java_boolean". */
3169 type = make_unsigned_type (-size);
3170 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3173 { /* "__java_float" or ""__java_double". */
3174 type = make_node (REAL_TYPE);
3175 TYPE_PRECISION (type) = - size;
3178 record_builtin_type (RID_MAX, name, type);
3179 decl = TYPE_NAME (type);
3181 /* Suppress generate debug symbol entries for these types,
3182 since for normal C++ they are just clutter.
3183 However, push_lang_context undoes this if extern "Java" is seen. */
3184 DECL_IGNORED_P (decl) = 1;
3186 TYPE_FOR_JAVA (type) = 1;
3190 /* Push a type into the namespace so that the back ends ignore it. */
3193 record_unknown_type (tree type, const char* name)
3195 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3196 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3197 DECL_IGNORED_P (decl) = 1;
3198 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3199 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3200 TYPE_ALIGN (type) = 1;
3201 TYPE_USER_ALIGN (type) = 0;
3202 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3205 /* A string for which we should create an IDENTIFIER_NODE at
3208 typedef struct predefined_identifier
3210 /* The name of the identifier. */
3211 const char *const name;
3212 /* The place where the IDENTIFIER_NODE should be stored. */
3214 /* Nonzero if this is the name of a constructor or destructor. */
3215 const int ctor_or_dtor_p;
3216 } predefined_identifier;
3218 /* Create all the predefined identifiers. */
3221 initialize_predefined_identifiers (void)
3223 const predefined_identifier *pid;
3225 /* A table of identifiers to create at startup. */
3226 static const predefined_identifier predefined_identifiers[] = {
3227 { "C++", &lang_name_cplusplus, 0 },
3228 { "C", &lang_name_c, 0 },
3229 { "Java", &lang_name_java, 0 },
3230 /* Some of these names have a trailing space so that it is
3231 impossible for them to conflict with names written by users. */
3232 { "__ct ", &ctor_identifier, 1 },
3233 { "__base_ctor ", &base_ctor_identifier, 1 },
3234 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3235 { "__dt ", &dtor_identifier, 1 },
3236 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3237 { "__base_dtor ", &base_dtor_identifier, 1 },
3238 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3239 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3240 { "nelts", &nelts_identifier, 0 },
3241 { THIS_NAME, &this_identifier, 0 },
3242 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3243 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3244 { "_vptr", &vptr_identifier, 0 },
3245 { "__vtt_parm", &vtt_parm_identifier, 0 },
3246 { "::", &global_scope_name, 0 },
3247 { "std", &std_identifier, 0 },
3251 for (pid = predefined_identifiers; pid->name; ++pid)
3253 *pid->node = get_identifier (pid->name);
3254 if (pid->ctor_or_dtor_p)
3255 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3259 /* Create the predefined scalar types of C,
3260 and some nodes representing standard constants (0, 1, (void *)0).
3261 Initialize the global binding level.
3262 Make definitions for built-in primitive functions. */
3265 cxx_init_decl_processing (void)
3268 tree void_ftype_ptr;
3270 build_common_tree_nodes (flag_signed_char, false);
3272 /* Create all the identifiers we need. */
3273 initialize_predefined_identifiers ();
3275 /* Create the global variables. */
3276 push_to_top_level ();
3278 current_function_decl = NULL_TREE;
3279 current_binding_level = NULL;
3280 /* Enter the global namespace. */
3281 gcc_assert (global_namespace == NULL_TREE);
3282 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3284 TREE_PUBLIC (global_namespace) = 1;
3285 begin_scope (sk_namespace, global_namespace);
3287 current_lang_name = NULL_TREE;
3289 if (flag_visibility_ms_compat)
3290 default_visibility = VISIBILITY_HIDDEN;
3293 current_lang_name = lang_name_c;
3295 /* Create the `std' namespace. */
3296 push_namespace (std_identifier);
3297 std_node = current_namespace;
3300 c_common_nodes_and_builtins ();
3302 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3303 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3304 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3305 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3306 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3307 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3308 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3309 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3311 integer_two_node = build_int_cst (NULL_TREE, 2);
3312 integer_three_node = build_int_cst (NULL_TREE, 3);
3314 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3315 truthvalue_type_node = boolean_type_node;
3316 truthvalue_false_node = boolean_false_node;
3317 truthvalue_true_node = boolean_true_node;
3319 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3322 record_builtin_type (RID_MAX, NULL, string_type_node);
3325 delta_type_node = ptrdiff_type_node;
3326 vtable_index_type = ptrdiff_type_node;
3328 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3329 void_ftype = build_function_type (void_type_node, void_list_node);
3330 void_ftype_ptr = build_function_type (void_type_node,
3331 tree_cons (NULL_TREE,
3335 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3337 /* C++ extensions */
3339 unknown_type_node = make_node (UNKNOWN_TYPE);
3340 record_unknown_type (unknown_type_node, "unknown type");
3342 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3343 TREE_TYPE (unknown_type_node) = unknown_type_node;
3345 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3347 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3348 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3350 init_list_type_node = make_node (UNKNOWN_TYPE);
3351 record_unknown_type (init_list_type_node, "init list");
3354 /* Make sure we get a unique function type, so we can give
3355 its pointer type a name. (This wins for gdb.) */
3356 tree vfunc_type = make_node (FUNCTION_TYPE);
3357 TREE_TYPE (vfunc_type) = integer_type_node;
3358 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3359 layout_type (vfunc_type);
3361 vtable_entry_type = build_pointer_type (vfunc_type);
3363 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3366 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3367 layout_type (vtbl_type_node);
3368 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3369 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3370 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3371 layout_type (vtbl_ptr_type_node);
3372 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3374 push_namespace (get_identifier ("__cxxabiv1"));
3375 abi_node = current_namespace;
3378 global_type_node = make_node (LANG_TYPE);
3379 record_unknown_type (global_type_node, "global type");
3382 current_lang_name = lang_name_cplusplus;
3386 tree bad_alloc_type_node;
3387 tree bad_alloc_decl;
3388 tree newtype, deltype;
3389 tree ptr_ftype_sizetype;
3391 push_namespace (std_identifier);
3392 bad_alloc_id = get_identifier ("bad_alloc");
3393 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3394 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3396 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3397 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3398 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3402 = build_function_type (ptr_type_node,
3403 tree_cons (NULL_TREE,
3406 newtype = build_exception_variant
3407 (ptr_ftype_sizetype, add_exception_specifier
3408 (NULL_TREE, bad_alloc_type_node, -1));
3409 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3410 push_cp_library_fn (NEW_EXPR, newtype);
3411 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3412 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3413 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3417 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3419 /* Perform other language dependent initializations. */
3420 init_class_processing ();
3421 init_rtti_processing ();
3423 if (flag_exceptions)
3424 init_exception_processing ();
3426 if (! supports_one_only ())
3429 make_fname_decl = cp_make_fname_decl;
3430 start_fname_decls ();
3432 /* Show we use EH for cleanups. */
3433 if (flag_exceptions)
3434 using_eh_for_cleanups ();
3437 /* Generate an initializer for a function naming variable from
3438 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3439 filled in with the type of the init. */
3442 cp_fname_init (const char* name, tree *type_p)
3444 tree domain = NULL_TREE;
3446 tree init = NULL_TREE;
3451 length = strlen (name);
3452 domain = build_index_type (size_int (length));
3453 init = build_string (length + 1, name);
3456 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3457 type = build_cplus_array_type (type, domain);
3462 TREE_TYPE (init) = type;
3464 init = error_mark_node;
3469 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3470 decl, NAME is the initialization string and TYPE_DEP indicates whether
3471 NAME depended on the type of the function. We make use of that to detect
3472 __PRETTY_FUNCTION__ inside a template fn. This is being done
3473 lazily at the point of first use, so we mustn't push the decl now. */
3476 cp_make_fname_decl (tree id, int type_dep)
3478 const char *const name = (type_dep && processing_template_decl
3479 ? NULL : fname_as_string (type_dep));
3481 tree init = cp_fname_init (name, &type);
3482 tree decl = build_decl (VAR_DECL, id, type);
3485 free (CONST_CAST (char *, name));
3487 /* As we're using pushdecl_with_scope, we must set the context. */
3488 DECL_CONTEXT (decl) = current_function_decl;
3489 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3491 TREE_STATIC (decl) = 1;
3492 TREE_READONLY (decl) = 1;
3493 DECL_ARTIFICIAL (decl) = 1;
3495 TREE_USED (decl) = 1;
3497 if (current_function_decl)
3499 struct cp_binding_level *b = current_binding_level;
3500 while (b->level_chain->kind != sk_function_parms)
3502 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3503 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3504 LOOKUP_ONLYCONVERTING);
3507 pushdecl_top_level_and_finish (decl, init);
3513 builtin_function_1 (tree decl, tree context, bool is_global)
3515 tree id = DECL_NAME (decl);
3516 const char *name = IDENTIFIER_POINTER (id);
3518 retrofit_lang_decl (decl);
3520 /* All nesting of C++ functions is lexical; there is never a "static
3521 chain" in the sense of GNU C nested functions. */
3522 DECL_NO_STATIC_CHAIN (decl) = 1;
3524 DECL_ARTIFICIAL (decl) = 1;
3525 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3526 SET_DECL_LANGUAGE (decl, lang_c);
3527 /* Runtime library routines are, by definition, available in an
3528 external shared object. */
3529 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3530 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3532 DECL_CONTEXT (decl) = context;
3535 pushdecl_top_level (decl);
3539 /* A function in the user's namespace should have an explicit
3540 declaration before it is used. Mark the built-in function as
3541 anticipated but not actually declared. */
3542 if (name[0] != '_' || name[1] != '_')
3543 DECL_ANTICIPATED (decl) = 1;
3544 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3546 size_t len = strlen (name);
3548 /* Treat __*_chk fortification functions as anticipated as well,
3549 unless they are __builtin_*. */
3550 if (len > strlen ("___chk")
3551 && memcmp (name + len - strlen ("_chk"),
3552 "_chk", strlen ("_chk") + 1) == 0)
3553 DECL_ANTICIPATED (decl) = 1;
3560 cxx_builtin_function (tree decl)
3562 tree id = DECL_NAME (decl);
3563 const char *name = IDENTIFIER_POINTER (id);
3564 /* All builtins that don't begin with an '_' should additionally
3565 go in the 'std' namespace. */
3568 tree decl2 = copy_node(decl);
3569 push_namespace (std_identifier);
3570 builtin_function_1 (decl2, std_node, false);
3574 return builtin_function_1 (decl, NULL_TREE, false);
3577 /* Like cxx_builtin_function, but guarantee the function is added to the global
3578 scope. This is to allow function specific options to add new machine
3579 dependent builtins when the target ISA changes via attribute((target(...)))
3580 which saves space on program startup if the program does not use non-generic
3584 cxx_builtin_function_ext_scope (tree decl)
3587 tree id = DECL_NAME (decl);
3588 const char *name = IDENTIFIER_POINTER (id);
3589 /* All builtins that don't begin with an '_' should additionally
3590 go in the 'std' namespace. */
3593 tree decl2 = copy_node(decl);
3594 push_namespace (std_identifier);
3595 builtin_function_1 (decl2, std_node, true);
3599 return builtin_function_1 (decl, NULL_TREE, true);
3602 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3603 function. Not called directly. */
3606 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3608 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3609 DECL_EXTERNAL (fn) = 1;
3610 TREE_PUBLIC (fn) = 1;
3611 DECL_ARTIFICIAL (fn) = 1;
3612 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3613 SET_DECL_LANGUAGE (fn, lang_c);
3614 /* Runtime library routines are, by definition, available in an
3615 external shared object. */
3616 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3617 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3621 /* Returns the _DECL for a library function with C linkage.
3622 We assume that such functions never throw; if this is incorrect,
3623 callers should unset TREE_NOTHROW. */
3626 build_library_fn (tree name, tree type)
3628 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3629 TREE_NOTHROW (fn) = 1;
3633 /* Returns the _DECL for a library function with C++ linkage. */
3636 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3638 tree fn = build_library_fn_1 (name, operator_code, type);
3639 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3640 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3641 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3645 /* Like build_library_fn, but takes a C string instead of an
3649 build_library_fn_ptr (const char* name, tree type)
3651 return build_library_fn (get_identifier (name), type);
3654 /* Like build_cp_library_fn, but takes a C string instead of an
3658 build_cp_library_fn_ptr (const char* name, tree type)
3660 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3663 /* Like build_library_fn, but also pushes the function so that we will
3664 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3665 may throw exceptions listed in RAISES. */
3668 push_library_fn (tree name, tree type, tree raises)
3673 type = build_exception_variant (type, raises);
3675 fn = build_library_fn (name, type);
3676 pushdecl_top_level (fn);
3680 /* Like build_cp_library_fn, but also pushes the function so that it
3681 will be found by normal lookup. */
3684 push_cp_library_fn (enum tree_code operator_code, tree type)
3686 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3693 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3697 push_void_library_fn (tree name, tree parmtypes)
3699 tree type = build_function_type (void_type_node, parmtypes);
3700 return push_library_fn (name, type, NULL_TREE);
3703 /* Like push_library_fn, but also note that this function throws
3704 and does not return. Used for __throw_foo and the like. */
3707 push_throw_library_fn (tree name, tree type)
3709 tree fn = push_library_fn (name, type, NULL_TREE);
3710 TREE_THIS_VOLATILE (fn) = 1;
3711 TREE_NOTHROW (fn) = 0;
3715 /* When we call finish_struct for an anonymous union, we create
3716 default copy constructors and such. But, an anonymous union
3717 shouldn't have such things; this function undoes the damage to the
3718 anonymous union type T.
3720 (The reason that we create the synthesized methods is that we don't
3721 distinguish `union { int i; }' from `typedef union { int i; } U'.
3722 The first is an anonymous union; the second is just an ordinary
3726 fixup_anonymous_aggr (tree t)
3730 /* Wipe out memory of synthesized methods. */
3731 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3732 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3733 TYPE_HAS_INIT_REF (t) = 0;
3734 TYPE_HAS_CONST_INIT_REF (t) = 0;
3735 TYPE_HAS_ASSIGN_REF (t) = 0;
3736 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3738 /* Splice the implicitly generated functions out of the TYPE_METHODS
3740 q = &TYPE_METHODS (t);
3743 if (DECL_ARTIFICIAL (*q))
3744 *q = TREE_CHAIN (*q);
3746 q = &TREE_CHAIN (*q);
3749 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3750 if (TYPE_METHODS (t))
3752 tree decl = TYPE_MAIN_DECL (t);
3754 if (TREE_CODE (t) != UNION_TYPE)
3755 error ("%Jan anonymous struct cannot have function members", decl);
3757 error ("%Jan anonymous union cannot have function members", decl);
3760 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3761 assignment operators (because they cannot have these methods themselves).
3762 For anonymous unions this is already checked because they are not allowed
3763 in any union, otherwise we have to check it. */
3764 if (TREE_CODE (t) != UNION_TYPE)
3768 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3769 if (TREE_CODE (field) == FIELD_DECL)
3771 type = TREE_TYPE (field);
3772 if (CLASS_TYPE_P (type))
3774 if (TYPE_NEEDS_CONSTRUCTING (type))
3775 error ("member %q+#D with constructor not allowed "
3776 "in anonymous aggregate", field);
3777 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3778 error ("member %q+#D with destructor not allowed "
3779 "in anonymous aggregate", field);
3780 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3781 error ("member %q+#D with copy assignment operator "
3782 "not allowed in anonymous aggregate", field);
3788 /* Make sure that a declaration with no declarator is well-formed, i.e.
3789 just declares a tagged type or anonymous union.
3791 Returns the type declared; or NULL_TREE if none. */
3794 check_tag_decl (cp_decl_specifier_seq *declspecs)
3796 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3797 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3798 /* If a class, struct, or enum type is declared by the DECLSPECS
3799 (i.e, if a class-specifier, enum-specifier, or non-typename
3800 elaborated-type-specifier appears in the DECLSPECS),
3801 DECLARED_TYPE is set to the corresponding type. */
3802 tree declared_type = NULL_TREE;
3803 bool error_p = false;
3805 if (declspecs->multiple_types_p)
3806 error ("multiple types in one declaration");
3807 else if (declspecs->redefined_builtin_type)
3809 if (!in_system_header)
3810 permerror (input_location, "redeclaration of C++ built-in type %qT",
3811 declspecs->redefined_builtin_type);
3816 && TYPE_P (declspecs->type)
3817 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3818 && MAYBE_CLASS_TYPE_P (declspecs->type))
3819 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3820 declared_type = declspecs->type;
3821 else if (declspecs->type == error_mark_node)
3823 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3824 permerror (input_location, "declaration does not declare anything");
3825 /* Check for an anonymous union. */
3826 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3827 && TYPE_ANONYMOUS_P (declared_type))
3829 /* 7/3 In a simple-declaration, the optional init-declarator-list
3830 can be omitted only when declaring a class (clause 9) or
3831 enumeration (7.2), that is, when the decl-specifier-seq contains
3832 either a class-specifier, an elaborated-type-specifier with
3833 a class-key (9.1), or an enum-specifier. In these cases and
3834 whenever a class-specifier or enum-specifier is present in the
3835 decl-specifier-seq, the identifiers in these specifiers are among
3836 the names being declared by the declaration (as class-name,
3837 enum-names, or enumerators, depending on the syntax). In such
3838 cases, and except for the declaration of an unnamed bit-field (9.6),
3839 the decl-specifier-seq shall introduce one or more names into the
3840 program, or shall redeclare a name introduced by a previous
3841 declaration. [Example:
3842 enum { }; // ill-formed
3843 typedef class { }; // ill-formed
3847 error ("missing type-name in typedef-declaration");
3850 /* Anonymous unions are objects, so they can have specifiers. */;
3851 SET_ANON_AGGR_TYPE_P (declared_type);
3853 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3854 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3859 if (declspecs->specs[(int)ds_inline]
3860 || declspecs->specs[(int)ds_virtual])
3861 error ("%qs can only be specified for functions",
3862 declspecs->specs[(int)ds_inline]
3863 ? "inline" : "virtual");
3865 && (!current_class_type
3866 || current_scope () != current_class_type))
3867 error ("%<friend%> can only be specified inside a class");
3868 else if (declspecs->specs[(int)ds_explicit])
3869 error ("%<explicit%> can only be specified for constructors");
3870 else if (declspecs->storage_class)
3871 error ("a storage class can only be specified for objects "
3873 else if (declspecs->specs[(int)ds_const]
3874 || declspecs->specs[(int)ds_volatile]
3875 || declspecs->specs[(int)ds_restrict]
3876 || declspecs->specs[(int)ds_thread])
3877 error ("qualifiers can only be specified for objects "
3879 else if (saw_typedef)
3880 warning (0, "%<typedef%> was ignored in this declaration");
3883 return declared_type;
3886 /* Called when a declaration is seen that contains no names to declare.
3887 If its type is a reference to a structure, union or enum inherited
3888 from a containing scope, shadow that tag name for the current scope
3889 with a forward reference.
3890 If its type defines a new named structure or union
3891 or defines an enum, it is valid but we need not do anything here.
3892 Otherwise, it is an error.
3894 C++: may have to grok the declspecs to learn about static,
3895 complain for anonymous unions.
3897 Returns the TYPE declared -- or NULL_TREE if none. */
3900 shadow_tag (cp_decl_specifier_seq *declspecs)
3902 tree t = check_tag_decl (declspecs);
3907 if (declspecs->attributes)
3909 warning (0, "attribute ignored in declaration of %q+#T", t);
3910 warning (0, "attribute for %q+#T must follow the %qs keyword",
3911 t, class_key_or_enum_as_string (t));
3915 if (maybe_process_partial_specialization (t) == error_mark_node)
3918 /* This is where the variables in an anonymous union are
3919 declared. An anonymous union declaration looks like:
3921 because there is no declarator after the union, the parser
3922 sends that declaration here. */
3923 if (ANON_AGGR_TYPE_P (t))
3925 fixup_anonymous_aggr (t);
3927 if (TYPE_FIELDS (t))
3929 tree decl = grokdeclarator (/*declarator=*/NULL,
3930 declspecs, NORMAL, 0, NULL);
3931 finish_anon_union (decl);
3938 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3941 groktypename (cp_decl_specifier_seq *type_specifiers,
3942 const cp_declarator *declarator)
3946 attrs = type_specifiers->attributes;
3947 type_specifiers->attributes = NULL_TREE;
3948 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3949 if (attrs && type != error_mark_node)
3951 if (CLASS_TYPE_P (type))
3952 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3953 "outside of definition", type);
3954 else if (MAYBE_CLASS_TYPE_P (type))
3955 /* A template type parameter or other dependent type. */
3956 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3957 "type %qT without an associated declaration", type);
3959 cplus_decl_attributes (&type, attrs, 0);
3964 /* Process a DECLARATOR for a function-scope variable declaration,
3965 namespace-scope variable declaration, or function declaration.
3966 (Function definitions go through start_function; class member
3967 declarations appearing in the body of the class go through
3968 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3969 If an error occurs, the error_mark_node is returned instead.
3971 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
3972 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
3973 for an explicitly defaulted function, or SD_DELETED for an explicitly
3974 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
3975 implicitly initialized via a default constructor. ATTRIBUTES and
3976 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
3977 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
3978 set, the caller is responsible for calling pop_scope. */
3981 start_decl (const cp_declarator *declarator,
3982 cp_decl_specifier_seq *declspecs,
3985 tree prefix_attributes,
3986 tree *pushed_scope_p)
3994 *pushed_scope_p = NULL_TREE;
3996 /* An object declared as __attribute__((deprecated)) suppresses
3997 warnings of uses of other deprecated items. */
3998 if (lookup_attribute ("deprecated", attributes))
3999 deprecated_state = DEPRECATED_SUPPRESS;
4001 attributes = chainon (attributes, prefix_attributes);
4003 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4006 deprecated_state = DEPRECATED_NORMAL;
4008 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4009 || decl == error_mark_node)
4010 return error_mark_node;
4012 type = TREE_TYPE (decl);
4014 context = DECL_CONTEXT (decl);
4018 *pushed_scope_p = push_scope (context);
4020 /* We are only interested in class contexts, later. */
4021 if (TREE_CODE (context) == NAMESPACE_DECL)
4022 context = NULL_TREE;
4026 /* Is it valid for this decl to have an initializer at all?
4027 If not, set INITIALIZED to zero, which will indirectly
4028 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4029 switch (TREE_CODE (decl))
4032 error ("typedef %qD is initialized (use decltype instead)", decl);
4033 return error_mark_node;
4036 if (initialized == SD_DELETED)
4037 /* We'll handle the rest of the semantics later, but we need to
4038 set this now so it's visible to duplicate_decls. */
4039 DECL_DELETED_FN (decl) = 1;
4048 if (! toplevel_bindings_p ()
4049 && DECL_EXTERNAL (decl))
4050 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4052 DECL_EXTERNAL (decl) = 0;
4053 if (toplevel_bindings_p ())
4054 TREE_STATIC (decl) = 1;
4057 /* If this is a typedef that names the class for linkage purposes
4058 (7.1.3p8), apply any attributes directly to the type. */
4059 if (TREE_CODE (decl) == TYPE_DECL
4060 && TAGGED_TYPE_P (TREE_TYPE (decl))
4061 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4062 flags = ATTR_FLAG_TYPE_IN_PLACE;
4066 /* Set attributes here so if duplicate decl, will have proper attributes. */
4067 cplus_decl_attributes (&decl, attributes, flags);
4069 /* Dllimported symbols cannot be defined. Static data members (which
4070 can be initialized in-class and dllimported) go through grokfield,
4071 not here, so we don't need to exclude those decls when checking for
4073 if (initialized && DECL_DLLIMPORT_P (decl))
4075 error ("definition of %q#D is marked %<dllimport%>", decl);
4076 DECL_DLLIMPORT_P (decl) = 0;
4079 /* If #pragma weak was used, mark the decl weak now. */
4080 maybe_apply_pragma_weak (decl);
4082 if (TREE_CODE (decl) == FUNCTION_DECL
4083 && DECL_DECLARED_INLINE_P (decl)
4084 && DECL_UNINLINABLE (decl)
4085 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4086 warning (0, "inline function %q+D given attribute noinline", decl);
4088 if (context && COMPLETE_TYPE_P (complete_type (context)))
4090 if (TREE_CODE (decl) == VAR_DECL)
4092 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4093 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4094 error ("%q#D is not a static member of %q#T", decl, context);
4097 if (DECL_CONTEXT (field) != context)
4099 if (!same_type_p (DECL_CONTEXT (field), context))
4100 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4101 "to be defined as %<%T::%D%>",
4102 DECL_CONTEXT (field), DECL_NAME (decl),
4103 context, DECL_NAME (decl));
4104 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4106 if (processing_specialization
4107 && template_class_depth (context) == 0
4108 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4109 error ("template header not allowed in member definition "
4110 "of explicitly specialized class");
4111 /* Static data member are tricky; an in-class initialization
4112 still doesn't provide a definition, so the in-class
4113 declaration will have DECL_EXTERNAL set, but will have an
4114 initialization. Thus, duplicate_decls won't warn
4115 about this situation, and so we check here. */
4116 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4117 error ("duplicate initialization of %qD", decl);
4118 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4124 tree field = check_classfn (context, decl,
4125 (processing_template_decl
4126 > template_class_depth (context))
4127 ? current_template_parms
4129 if (field && field != error_mark_node
4130 && duplicate_decls (decl, field,
4131 /*newdecl_is_friend=*/false))
4135 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4136 DECL_IN_AGGR_P (decl) = 0;
4137 /* Do not mark DECL as an explicit specialization if it was not
4138 already marked as an instantiation; a declaration should
4139 never be marked as a specialization unless we know what
4140 template is being specialized. */
4141 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4143 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4145 /* [temp.expl.spec] An explicit specialization of a static data
4146 member of a template is a definition if the declaration
4147 includes an initializer; otherwise, it is a declaration.
4149 We check for processing_specialization so this only applies
4150 to the new specialization syntax. */
4151 if (!initialized && processing_specialization)
4152 DECL_EXTERNAL (decl) = 1;
4155 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4156 permerror (input_location, "declaration of %q#D outside of class is not definition",
4160 was_public = TREE_PUBLIC (decl);
4162 /* Enter this declaration into the symbol table. */
4163 decl = maybe_push_decl (decl);
4165 if (processing_template_decl)
4166 decl = push_template_decl (decl);
4167 if (decl == error_mark_node)
4168 return error_mark_node;
4170 /* Tell the back end to use or not use .common as appropriate. If we say
4171 -fconserve-space, we want this to save .data space, at the expense of
4172 wrong semantics. If we say -fno-conserve-space, we want this to
4173 produce errors about redefs; to do this we force variables into the
4175 if (flag_conserve_space
4176 && TREE_CODE (decl) == VAR_DECL
4177 && TREE_PUBLIC (decl)
4178 && !DECL_THREAD_LOCAL_P (decl)
4179 && !have_global_bss_p ())
4180 DECL_COMMON (decl) = 1;
4182 if (TREE_CODE (decl) == VAR_DECL
4183 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4184 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4186 /* This is a const variable with implicit 'static'. Set
4187 DECL_THIS_STATIC so we can tell it from variables that are
4188 !TREE_PUBLIC because of the anonymous namespace. */
4189 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4190 DECL_THIS_STATIC (decl) = 1;
4193 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4194 start_decl_1 (decl, initialized);
4199 /* Process the declaration of a variable DECL. INITIALIZED is true
4200 iff DECL is explicitly initialized. (INITIALIZED is false if the
4201 variable is initialized via an implicitly-called constructor.)
4202 This function must be called for ordinary variables (including, for
4203 example, implicit instantiations of templates), but must not be
4204 called for template declarations. */
4207 start_decl_1 (tree decl, bool initialized)
4211 bool aggregate_definition_p;
4213 gcc_assert (!processing_template_decl);
4215 if (error_operand_p (decl))
4218 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4220 type = TREE_TYPE (decl);
4221 complete_p = COMPLETE_TYPE_P (type);
4222 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4224 /* If an explicit initializer is present, or if this is a definition
4225 of an aggregate, then we need a complete type at this point.
4226 (Scalars are always complete types, so there is nothing to
4227 check.) This code just sets COMPLETE_P; errors (if necessary)
4228 are issued below. */
4229 if ((initialized || aggregate_definition_p)
4231 && COMPLETE_TYPE_P (complete_type (type)))
4234 /* We will not yet have set TREE_READONLY on DECL if the type
4235 was "const", but incomplete, before this point. But, now, we
4236 have a complete type, so we can try again. */
4237 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4241 /* Is it valid for this decl to have an initializer at all? */
4243 /* Don't allow initializations for incomplete types except for
4244 arrays which might be completed by the initialization. */
4246 ; /* A complete type is ok. */
4247 else if (type_uses_auto (type))
4248 ; /* An auto type is ok. */
4249 else if (TREE_CODE (type) != ARRAY_TYPE)
4251 error ("variable %q#D has initializer but incomplete type", decl);
4252 type = TREE_TYPE (decl) = error_mark_node;
4254 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4256 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4257 error ("elements of array %q#D have incomplete type", decl);
4258 /* else we already gave an error in start_decl. */
4261 else if (aggregate_definition_p && !complete_p)
4263 if (type_uses_auto (type))
4264 error ("declaration of %q#D has no initializer", decl);
4266 error ("aggregate %q#D has incomplete type and cannot be defined",
4268 /* Change the type so that assemble_variable will give
4269 DECL an rtl we can live with: (mem (const_int 0)). */
4270 type = TREE_TYPE (decl) = error_mark_node;
4273 /* Create a new scope to hold this declaration if necessary.
4274 Whether or not a new scope is necessary cannot be determined
4275 until after the type has been completed; if the type is a
4276 specialization of a class template it is not until after
4277 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4278 will be set correctly. */
4279 maybe_push_cleanup_level (type);
4282 /* Handle initialization of references. DECL, TYPE, and INIT have the
4283 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4284 but will be set to a new CLEANUP_STMT if a temporary is created
4285 that must be destroyed subsequently.
4287 Returns an initializer expression to use to initialize DECL, or
4288 NULL if the initialization can be performed statically.
4290 Quotes on semantics can be found in ARM 8.4.3. */
4293 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4297 if (init == NULL_TREE)
4299 if ((DECL_LANG_SPECIFIC (decl) == 0
4300 || DECL_IN_AGGR_P (decl) == 0)
4301 && ! DECL_THIS_EXTERN (decl))
4302 error ("%qD declared as reference but not initialized", decl);
4306 if (TREE_CODE (init) == CONSTRUCTOR)
4308 error ("ISO C++ forbids use of initializer list to "
4309 "initialize reference %qD", decl);
4313 if (TREE_CODE (init) == TREE_LIST)
4314 init = build_x_compound_expr_from_list (init, "initializer");
4316 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4317 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4318 /* Note: default conversion is only called in very special cases. */
4319 init = decay_conversion (init);
4321 /* Convert INIT to the reference type TYPE. This may involve the
4322 creation of a temporary, whose lifetime must be the same as that
4323 of the reference. If so, a DECL_EXPR for the temporary will be
4324 added just after the DECL_EXPR for DECL. That's why we don't set
4325 DECL_INITIAL for local references (instead assigning to them
4326 explicitly); we need to allow the temporary to be initialized
4328 tmp = initialize_reference (type, init, decl, cleanup);
4330 if (tmp == error_mark_node)
4332 else if (tmp == NULL_TREE)
4334 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4338 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4341 DECL_INITIAL (decl) = tmp;
4346 /* Subroutine of check_initializer. We're initializing a DECL of
4347 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4348 extend the lifetime of the underlying array to match that of the decl,
4349 just like for reference initialization. CLEANUP is as for
4350 grok_reference_init. */
4353 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4355 tree aggr_init, array, arrtype;
4356 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4357 aggr_init = TARGET_EXPR_INITIAL (init);
4358 init = build2 (INIT_EXPR, type, decl, init);
4360 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4361 arrtype = TREE_TYPE (array);
4363 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4364 array = TREE_OPERAND (array, 0);
4365 /* If the array is constant, finish_compound_literal already made it a
4366 static variable and we don't need to do anything here. */
4367 if (decl && TREE_CODE (array) == TARGET_EXPR)
4370 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4371 var = build_address (var);
4372 var = convert (arrtype, var);
4373 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4374 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4379 /* Designated initializers in arrays are not supported in GNU C++.
4380 The parser cannot detect this error since it does not know whether
4381 a given brace-enclosed initializer is for a class type or for an
4382 array. This function checks that CE does not use a designated
4383 initializer. If it does, an error is issued. Returns true if CE
4384 is valid, i.e., does not have a designated initializer. */
4387 check_array_designated_initializer (const constructor_elt *ce)
4389 /* Designated initializers for array elements are not supported. */
4392 /* The parser only allows identifiers as designated
4394 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4395 error ("name %qD used in a GNU-style designated "
4396 "initializer for an array", ce->index);
4403 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4404 array until we finish parsing the initializer. If that's the
4405 situation we're in, update DECL accordingly. */
4408 maybe_deduce_size_from_array_init (tree decl, tree init)
4410 tree type = TREE_TYPE (decl);
4412 if (TREE_CODE (type) == ARRAY_TYPE
4413 && TYPE_DOMAIN (type) == NULL_TREE
4414 && TREE_CODE (decl) != TYPE_DECL)
4416 /* do_default is really a C-ism to deal with tentative definitions.
4417 But let's leave it here to ease the eventual merge. */
4418 int do_default = !DECL_EXTERNAL (decl);
4419 tree initializer = init ? init : DECL_INITIAL (decl);
4422 /* Check that there are no designated initializers in INIT, as
4423 those are not supported in GNU C++, and as the middle-end
4424 will crash if presented with a non-numeric designated
4426 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4428 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4429 constructor_elt *ce;
4432 VEC_iterate (constructor_elt, v, i, ce);
4434 if (!check_array_designated_initializer (ce))
4440 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4444 error ("initializer fails to determine size of %qD", decl);
4445 TREE_TYPE (decl) = error_mark_node;
4447 else if (failure == 2)
4451 error ("array size missing in %qD", decl);
4452 TREE_TYPE (decl) = error_mark_node;
4454 /* If a `static' var's size isn't known, make it extern as
4455 well as static, so it does not get allocated. If it's not
4456 `static', then don't mark it extern; finish_incomplete_decl
4457 will give it a default size and it will get allocated. */
4458 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4459 DECL_EXTERNAL (decl) = 1;
4461 else if (failure == 3)
4463 error ("zero-size array %qD", decl);
4464 TREE_TYPE (decl) = error_mark_node;
4468 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4470 layout_decl (decl, 0);
4474 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4475 any appropriate error messages regarding the layout. */
4478 layout_var_decl (tree decl)
4482 type = TREE_TYPE (decl);
4483 if (type == error_mark_node)
4486 /* If we haven't already layed out this declaration, do so now.
4487 Note that we must not call complete type for an external object
4488 because it's type might involve templates that we are not
4489 supposed to instantiate yet. (And it's perfectly valid to say
4490 `extern X x' for some incomplete type `X'.) */
4491 if (!DECL_EXTERNAL (decl))
4492 complete_type (type);
4493 if (!DECL_SIZE (decl)
4494 && TREE_TYPE (decl) != error_mark_node
4495 && (COMPLETE_TYPE_P (type)
4496 || (TREE_CODE (type) == ARRAY_TYPE
4497 && !TYPE_DOMAIN (type)
4498 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4499 layout_decl (decl, 0);
4501 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4503 /* An automatic variable with an incomplete type: that is an error.
4504 Don't talk about array types here, since we took care of that
4505 message in grokdeclarator. */
4506 error ("storage size of %qD isn't known", decl);
4507 TREE_TYPE (decl) = error_mark_node;
4510 /* Keep this code around in case we later want to control debug info
4511 based on whether a type is "used". (jason 1999-11-11) */
4513 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4514 /* Let debugger know it should output info for this type. */
4515 note_debug_info_needed (ttype);
4517 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4518 note_debug_info_needed (DECL_CONTEXT (decl));
4521 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4522 && DECL_SIZE (decl) != NULL_TREE
4523 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4525 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4526 constant_expression_warning (DECL_SIZE (decl));
4529 error ("storage size of %qD isn't constant", decl);
4530 TREE_TYPE (decl) = error_mark_node;
4535 /* If a local static variable is declared in an inline function, or if
4536 we have a weak definition, we must endeavor to create only one
4537 instance of the variable at link-time. */
4540 maybe_commonize_var (tree decl)
4542 /* Static data in a function with comdat linkage also has comdat
4544 if (TREE_STATIC (decl)
4545 /* Don't mess with __FUNCTION__. */
4546 && ! DECL_ARTIFICIAL (decl)
4547 && DECL_FUNCTION_SCOPE_P (decl)
4548 /* Unfortunately, import_export_decl has not always been called
4549 before the function is processed, so we cannot simply check
4551 && (DECL_COMDAT (DECL_CONTEXT (decl))
4552 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4553 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4554 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4558 /* With weak symbols, we simply make the variable COMDAT;
4559 that will cause copies in multiple translations units to
4561 comdat_linkage (decl);
4565 if (DECL_INITIAL (decl) == NULL_TREE
4566 || DECL_INITIAL (decl) == error_mark_node)
4568 /* Without weak symbols, we can use COMMON to merge
4569 uninitialized variables. */
4570 TREE_PUBLIC (decl) = 1;
4571 DECL_COMMON (decl) = 1;
4575 /* While for initialized variables, we must use internal
4576 linkage -- which means that multiple copies will not
4578 TREE_PUBLIC (decl) = 0;
4579 DECL_COMMON (decl) = 0;
4580 warning (0, "sorry: semantics of inline function static "
4581 "data %q+#D are wrong (you'll wind up "
4582 "with multiple copies)", decl);
4583 warning (0, "%J you can work around this by removing "
4589 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4590 /* Set it up again; we might have set DECL_INITIAL since the last
4592 comdat_linkage (decl);
4595 /* Issue an error message if DECL is an uninitialized const variable. */
4598 check_for_uninitialized_const_var (tree decl)
4600 tree type = TREE_TYPE (decl);
4602 /* ``Unless explicitly declared extern, a const object does not have
4603 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4605 if (TREE_CODE (decl) == VAR_DECL
4606 && TREE_CODE (type) != REFERENCE_TYPE
4607 && CP_TYPE_CONST_P (type)
4608 && !TYPE_NEEDS_CONSTRUCTING (type)
4609 && !DECL_INITIAL (decl))
4610 error ("uninitialized const %qD", decl);
4614 /* Structure holding the current initializer being processed by reshape_init.
4615 CUR is a pointer to the current element being processed, END is a pointer
4616 after the last element present in the initializer. */
4617 typedef struct reshape_iterator_t
4619 constructor_elt *cur;
4620 constructor_elt *end;
4623 static tree reshape_init_r (tree, reshape_iter *, bool);
4625 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4626 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4627 initialized. If there are no more such fields, the return value
4631 next_initializable_field (tree field)
4634 && (TREE_CODE (field) != FIELD_DECL
4635 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4636 || DECL_ARTIFICIAL (field)))
4637 field = TREE_CHAIN (field);
4642 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4643 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4644 INTEGER_CST representing the size of the array minus one (the maximum index),
4645 or NULL_TREE if the array was declared without specifying the size. D is
4646 the iterator within the constructor. */
4649 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4652 bool sized_array_p = (max_index != NULL_TREE);
4653 unsigned HOST_WIDE_INT max_index_cst = 0;
4654 unsigned HOST_WIDE_INT index;
4656 /* The initializer for an array is always a CONSTRUCTOR. */
4657 new_init = build_constructor (init_list_type_node, NULL);
4661 /* Minus 1 is used for zero sized arrays. */
4662 if (integer_all_onesp (max_index))
4665 if (host_integerp (max_index, 1))
4666 max_index_cst = tree_low_cst (max_index, 1);
4667 /* sizetype is sign extended, not zero extended. */
4669 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4673 /* Loop until there are no more initializers. */
4675 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4680 check_array_designated_initializer (d->cur);
4681 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4682 if (elt_init == error_mark_node)
4683 return error_mark_node;
4684 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4690 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4691 Parameters are the same of reshape_init_r. */
4694 reshape_init_array (tree type, reshape_iter *d)
4696 tree max_index = NULL_TREE;
4698 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4700 if (TYPE_DOMAIN (type))
4701 max_index = array_type_nelts (type);
4703 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4706 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4707 Parameters are the same of reshape_init_r. */
4710 reshape_init_vector (tree type, reshape_iter *d)
4712 tree max_index = NULL_TREE;
4715 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4717 if (COMPOUND_LITERAL_P (d->cur->value))
4719 tree value = d->cur->value;
4720 if (!same_type_p (TREE_TYPE (value), type))
4722 error ("invalid type %qT as initializer for a vector of type %qT",
4723 TREE_TYPE (d->cur->value), type);
4724 value = error_mark_node;
4730 /* For a vector, the representation type is a struct
4731 containing a single member which is an array of the
4732 appropriate size. */
4733 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4734 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4735 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4737 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4740 /* Subroutine of reshape_init_r, processes the initializers for classes
4741 or union. Parameters are the same of reshape_init_r. */
4744 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4749 gcc_assert (CLASS_TYPE_P (type));
4751 /* The initializer for a class is always a CONSTRUCTOR. */
4752 new_init = build_constructor (init_list_type_node, NULL);
4753 field = next_initializable_field (TYPE_FIELDS (type));
4759 An initializer for an aggregate member that is an
4760 empty class shall have the form of an empty
4761 initializer-list {}. */
4762 if (!first_initializer_p)
4764 error ("initializer for %qT must be brace-enclosed", type);
4765 return error_mark_node;
4770 /* Loop through the initializable fields, gathering initializers. */
4771 while (d->cur != d->end)
4775 /* Handle designated initializers, as an extension. */
4778 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4780 if (!field || TREE_CODE (field) != FIELD_DECL)
4782 error ("%qT has no non-static data member named %qD", type,
4784 return error_mark_node;
4788 /* If we processed all the member of the class, we are done. */
4792 field_init = reshape_init_r (TREE_TYPE (field), d,
4793 /*first_initializer_p=*/false);
4794 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4798 When a union is initialized with a brace-enclosed
4799 initializer, the braces shall only contain an
4800 initializer for the first member of the union. */
4801 if (TREE_CODE (type) == UNION_TYPE)
4804 field = next_initializable_field (TREE_CHAIN (field));
4810 /* Subroutine of reshape_init, which processes a single initializer (part of
4811 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4812 iterator within the CONSTRUCTOR which points to the initializer to process.
4813 FIRST_INITIALIZER_P is true if this is the first initializer of the
4814 CONSTRUCTOR node. */
4817 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4819 tree init = d->cur->value;
4821 if (error_operand_p (init))
4822 return error_mark_node;
4824 /* A non-aggregate type is always initialized with a single
4826 if (!CP_AGGREGATE_TYPE_P (type))
4828 /* It is invalid to initialize a non-aggregate type with a
4829 brace-enclosed initializer before C++0x.
4830 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4831 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4832 a CONSTRUCTOR (with a record type). */
4833 if (TREE_CODE (init) == CONSTRUCTOR
4834 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4836 if (SCALAR_TYPE_P (type))
4838 error ("braces around scalar initializer for type %qT", type);
4839 init = error_mark_node;
4842 maybe_warn_cpp0x ("extended initializer lists");
4851 All implicit type conversions (clause _conv_) are considered when
4852 initializing the aggregate member with an initializer from an
4853 initializer-list. If the initializer can initialize a member,
4854 the member is initialized. Otherwise, if the member is itself a
4855 non-empty subaggregate, brace elision is assumed and the
4856 initializer is considered for the initialization of the first
4857 member of the subaggregate. */
4858 if (TREE_CODE (init) != CONSTRUCTOR
4859 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4865 /* [dcl.init.string]
4867 A char array (whether plain char, signed char, or unsigned char)
4868 can be initialized by a string-literal (optionally enclosed in
4869 braces); a wchar_t array can be initialized by a wide
4870 string-literal (optionally enclosed in braces). */
4871 if (TREE_CODE (type) == ARRAY_TYPE
4872 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4874 tree str_init = init;
4876 /* Strip one level of braces if and only if they enclose a single
4877 element (as allowed by [dcl.init.string]). */
4878 if (!first_initializer_p
4879 && TREE_CODE (str_init) == CONSTRUCTOR
4880 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4882 str_init = VEC_index (constructor_elt,
4883 CONSTRUCTOR_ELTS (str_init), 0)->value;
4886 /* If it's a string literal, then it's the initializer for the array
4887 as a whole. Otherwise, continue with normal initialization for
4888 array types (one value per array element). */
4889 if (TREE_CODE (str_init) == STRING_CST)
4896 /* The following cases are about aggregates. If we are not within a full
4897 initializer already, and there is not a CONSTRUCTOR, it means that there
4898 is a missing set of braces (that is, we are processing the case for
4899 which reshape_init exists). */
4900 if (!first_initializer_p)
4902 if (TREE_CODE (init) == CONSTRUCTOR)
4904 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4905 /* There is no need to reshape pointer-to-member function
4906 initializers, as they are always constructed correctly
4907 by the front end. */
4909 else if (COMPOUND_LITERAL_P (init))
4910 /* For a nested compound literal, there is no need to reshape since
4911 brace elision is not allowed. Even if we decided to allow it,
4912 we should add a call to reshape_init in finish_compound_literal,
4913 before calling digest_init, so changing this code would still
4914 not be necessary. */
4915 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4919 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4920 return reshape_init (type, init);
4924 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4928 /* Dispatch to specialized routines. */
4929 if (CLASS_TYPE_P (type))
4930 return reshape_init_class (type, d, first_initializer_p);
4931 else if (TREE_CODE (type) == ARRAY_TYPE)
4932 return reshape_init_array (type, d);
4933 else if (TREE_CODE (type) == VECTOR_TYPE)
4934 return reshape_init_vector (type, d);
4939 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4940 brace-enclosed aggregate initializer.
4942 INIT is the CONSTRUCTOR containing the list of initializers describing
4943 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4944 It may not presently match the shape of the TYPE; for example:
4946 struct S { int a; int b; };
4947 struct S a[] = { 1, 2, 3, 4 };
4949 Here INIT will hold a VEC of four elements, rather than a
4950 VEC of two elements, each itself a VEC of two elements. This
4951 routine transforms INIT from the former form into the latter. The
4952 revised CONSTRUCTOR node is returned. */
4955 reshape_init (tree type, tree init)
4957 VEC(constructor_elt, gc) *v;
4961 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4963 v = CONSTRUCTOR_ELTS (init);
4965 /* An empty constructor does not need reshaping, and it is always a valid
4967 if (VEC_empty (constructor_elt, v))
4970 /* Recurse on this CONSTRUCTOR. */
4971 d.cur = VEC_index (constructor_elt, v, 0);
4972 d.end = d.cur + VEC_length (constructor_elt, v);
4974 new_init = reshape_init_r (type, &d, true);
4975 if (new_init == error_mark_node)
4976 return error_mark_node;
4978 /* Make sure all the element of the constructor were used. Otherwise,
4979 issue an error about exceeding initializers. */
4981 error ("too many initializers for %qT", type);
4986 /* Verify array initializer. Returns true if errors have been reported. */
4989 check_array_initializer (tree decl, tree type, tree init)
4991 tree element_type = TREE_TYPE (type);
4993 /* The array type itself need not be complete, because the
4994 initializer may tell us how many elements are in the array.
4995 But, the elements of the array must be complete. */
4996 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4999 error ("elements of array %q#D have incomplete type", decl);
5001 error ("elements of array %q#T have incomplete type", type);
5004 /* It is not valid to initialize a VLA. */
5006 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5007 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5010 error ("variable-sized object %qD may not be initialized", decl);
5012 error ("variable-sized compound literal");
5018 /* Subroutine of check_initializer; args are passed down from that function.
5019 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5022 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5025 int saved_stmts_are_full_exprs_p = 0;
5026 if (building_stmt_tree ())
5028 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5029 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5031 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5032 if (building_stmt_tree ())
5033 current_stmt_tree ()->stmts_are_full_exprs_p =
5034 saved_stmts_are_full_exprs_p;
5038 /* Verify INIT (the initializer for DECL), and record the
5039 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5040 grok_reference_init.
5042 If the return value is non-NULL, it is an expression that must be
5043 evaluated dynamically to initialize DECL. */
5046 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5048 tree type = TREE_TYPE (decl);
5049 tree init_code = NULL;
5051 /* Things that are going to be initialized need to have complete
5053 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5055 if (type == error_mark_node)
5056 /* We will have already complained. */
5059 if (TREE_CODE (type) == ARRAY_TYPE)
5061 if (check_array_initializer (decl, type, init))
5064 else if (!COMPLETE_TYPE_P (type))
5066 error ("%qD has incomplete type", decl);
5067 TREE_TYPE (decl) = error_mark_node;
5071 /* There is no way to make a variable-sized class type in GNU C++. */
5072 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5074 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5076 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5077 if (SCALAR_TYPE_P (type))
5081 maybe_warn_cpp0x ("extended initializer lists");
5082 init = build_zero_init (type, NULL_TREE, false);
5084 else if (init_len != 1)
5086 error ("scalar object %qD requires one element in initializer",
5088 TREE_TYPE (decl) = error_mark_node;
5094 if (TREE_CODE (decl) == CONST_DECL)
5096 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5098 DECL_INITIAL (decl) = init;
5100 gcc_assert (init != NULL_TREE);
5103 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5104 init = grok_reference_init (decl, type, init, cleanup);
5107 /* Do not reshape constructors of vectors (they don't need to be
5109 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5111 if (is_std_init_list (type))
5112 return build_init_list_var_init (decl, type, init, cleanup);
5113 else if (TYPE_NON_AGGREGATE_CLASS (type))
5115 /* Don't reshape if the class has constructors. */
5116 if (cxx_dialect == cxx98)
5117 error ("in C++98 %qD must be initialized by constructor, "
5120 init = build_tree_list (NULL_TREE, init);
5122 else if ((*targetm.vector_opaque_p) (type))
5124 error ("opaque vector types cannot be initialized");
5125 init = error_mark_node;
5128 init = reshape_init (type, init);
5131 /* If DECL has an array type without a specific bound, deduce the
5132 array size from the initializer. */
5133 maybe_deduce_size_from_array_init (decl, init);
5134 type = TREE_TYPE (decl);
5135 if (type == error_mark_node)
5138 if (TYPE_NEEDS_CONSTRUCTING (type)
5139 || (CLASS_TYPE_P (type)
5140 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5141 return build_aggr_init_full_exprs (decl, init, flags);
5142 else if (TREE_CODE (init) != TREE_VEC)
5144 init_code = store_init_value (decl, init);
5145 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5146 && DECL_INITIAL (decl)
5147 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5148 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5149 warning (0, "array %qD initialized by parenthesized string literal %qE",
5150 decl, DECL_INITIAL (decl));
5154 else if (DECL_EXTERNAL (decl))
5156 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5157 return build_aggr_init_full_exprs (decl, init, flags);
5158 else if (MAYBE_CLASS_TYPE_P (type))
5160 tree core_type = strip_array_types (type);
5162 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5163 error ("structure %qD with uninitialized const members", decl);
5164 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5165 error ("structure %qD with uninitialized reference members", decl);
5167 check_for_uninitialized_const_var (decl);
5170 check_for_uninitialized_const_var (decl);
5172 if (init && init != error_mark_node)
5173 init_code = build2 (INIT_EXPR, type, decl, init);
5178 /* If DECL is not a local variable, give it RTL. */
5181 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5183 int toplev = toplevel_bindings_p ();
5185 const char *filename;
5187 /* Set the DECL_ASSEMBLER_NAME for the object. */
5190 /* The `register' keyword, when used together with an
5191 asm-specification, indicates that the variable should be
5192 placed in a particular register. */
5193 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5195 set_user_assembler_name (decl, asmspec);
5196 DECL_HARD_REGISTER (decl) = 1;
5200 if (TREE_CODE (decl) == FUNCTION_DECL
5201 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5202 set_builtin_user_assembler_name (decl, asmspec);
5203 set_user_assembler_name (decl, asmspec);
5207 /* Handle non-variables up front. */
5208 if (TREE_CODE (decl) != VAR_DECL)
5210 rest_of_decl_compilation (decl, toplev, at_eof);
5214 /* If we see a class member here, it should be a static data
5216 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5218 gcc_assert (TREE_STATIC (decl));
5219 /* An in-class declaration of a static data member should be
5220 external; it is only a declaration, and not a definition. */
5221 if (init == NULL_TREE)
5222 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5225 /* We don't create any RTL for local variables. */
5226 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5229 /* We defer emission of local statics until the corresponding
5230 DECL_EXPR is expanded. */
5231 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5233 /* We try to defer namespace-scope static constants so that they are
5234 not emitted into the object file unnecessarily. */
5235 filename = input_filename;
5236 if (!DECL_VIRTUAL_P (decl)
5237 && TREE_READONLY (decl)
5238 && DECL_INITIAL (decl) != NULL_TREE
5239 && DECL_INITIAL (decl) != error_mark_node
5241 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5243 && !TREE_PUBLIC (decl))
5245 /* Fool with the linkage of static consts according to #pragma
5247 struct c_fileinfo *finfo = get_fileinfo (filename);
5248 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5250 TREE_PUBLIC (decl) = 1;
5251 DECL_EXTERNAL (decl) = finfo->interface_only;
5256 /* Likewise for template instantiations. */
5257 else if (DECL_LANG_SPECIFIC (decl)
5258 && DECL_IMPLICIT_INSTANTIATION (decl))
5261 /* If we're not deferring, go ahead and assemble the variable. */
5263 rest_of_decl_compilation (decl, toplev, at_eof);
5266 /* walk_tree helper for wrap_temporary_cleanups, below. */
5269 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5271 if (TYPE_P (*stmt_p))
5277 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5279 tree guard = (tree)data;
5280 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5282 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5283 /* Tell honor_protect_cleanup_actions to handle this as a separate
5285 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5287 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5293 /* We're initializing a local variable which has a cleanup GUARD. If there
5294 are any temporaries used in the initializer INIT of this variable, we
5295 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5296 variable will be cleaned up properly if one of them throws.
5298 Unfortunately, there's no way to express this properly in terms of
5299 nesting, as the regions for the temporaries overlap the region for the
5300 variable itself; if there are two temporaries, the variable needs to be
5301 the first thing destroyed if either of them throws. However, we only
5302 want to run the variable's cleanup if it actually got constructed. So
5303 we need to guard the temporary cleanups with the variable's cleanup if
5304 they are run on the normal path, but not if they are run on the
5305 exceptional path. We implement this by telling
5306 honor_protect_cleanup_actions to strip the variable cleanup from the
5307 exceptional path. */
5310 wrap_temporary_cleanups (tree init, tree guard)
5312 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5315 /* Generate code to initialize DECL (a local variable). */
5318 initialize_local_var (tree decl, tree init)
5320 tree type = TREE_TYPE (decl);
5324 gcc_assert (TREE_CODE (decl) == VAR_DECL
5325 || TREE_CODE (decl) == RESULT_DECL);
5326 gcc_assert (!TREE_STATIC (decl));
5328 if (DECL_SIZE (decl) == NULL_TREE)
5330 /* If we used it already as memory, it must stay in memory. */
5331 DECL_INITIAL (decl) = NULL_TREE;
5332 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5336 if (type == error_mark_node)
5339 /* Compute and store the initial value. */
5340 already_used = TREE_USED (decl) || TREE_USED (type);
5342 /* Generate a cleanup, if necessary. */
5343 cleanup = cxx_maybe_build_cleanup (decl);
5345 /* Perform the initialization. */
5348 int saved_stmts_are_full_exprs_p;
5350 /* If we're only initializing a single object, guard the destructors
5351 of any temporaries used in its initializer with its destructor.
5352 This isn't right for arrays because each element initialization is
5353 a full-expression. */
5354 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5355 wrap_temporary_cleanups (init, cleanup);
5357 gcc_assert (building_stmt_tree ());
5358 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5359 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5360 finish_expr_stmt (init);
5361 current_stmt_tree ()->stmts_are_full_exprs_p =
5362 saved_stmts_are_full_exprs_p;
5365 /* Set this to 0 so we can tell whether an aggregate which was
5366 initialized was ever used. Don't do this if it has a
5367 destructor, so we don't complain about the 'resource
5368 allocation is initialization' idiom. Now set
5369 attribute((unused)) on types so decls of that type will be
5370 marked used. (see TREE_USED, above.) */
5371 if (TYPE_NEEDS_CONSTRUCTING (type)
5373 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5374 && DECL_NAME (decl))
5375 TREE_USED (decl) = 0;
5376 else if (already_used)
5377 TREE_USED (decl) = 1;
5380 finish_decl_cleanup (decl, cleanup);
5383 /* DECL is a VAR_DECL for a compiler-generated variable with static
5384 storage duration (like a virtual table) whose initializer is a
5385 compile-time constant. INIT must be either a TREE_LIST of values,
5386 or a CONSTRUCTOR. Initialize the variable and provide it to the
5390 initialize_artificial_var (tree decl, tree init)
5392 gcc_assert (DECL_ARTIFICIAL (decl));
5393 if (TREE_CODE (init) == TREE_LIST)
5394 init = build_constructor_from_list (TREE_TYPE (decl), init);
5395 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5396 DECL_INITIAL (decl) = init;
5397 DECL_INITIALIZED_P (decl) = 1;
5398 determine_visibility (decl);
5399 layout_var_decl (decl);
5400 maybe_commonize_var (decl);
5401 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5404 /* INIT is the initializer for a variable, as represented by the
5405 parser. Returns true iff INIT is value-dependent. */
5408 value_dependent_init_p (tree init)
5410 if (TREE_CODE (init) == TREE_LIST)
5411 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5412 return any_value_dependent_elements_p (init);
5413 else if (TREE_CODE (init) == CONSTRUCTOR)
5414 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5416 VEC(constructor_elt, gc) *elts;
5420 elts = CONSTRUCTOR_ELTS (init);
5421 nelts = VEC_length (constructor_elt, elts);
5422 for (i = 0; i < nelts; ++i)
5423 if (value_dependent_init_p (VEC_index (constructor_elt,
5428 /* It must be a simple expression, e.g., int i = 3; */
5429 return value_dependent_expression_p (init);
5434 /* Finish processing of a declaration;
5435 install its line number and initial value.
5436 If the length of an array type is not known before,
5437 it must be determined now, from the initial value, or it is an error.
5439 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5440 true, then INIT is an integral constant expression.
5442 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5443 if the (init) syntax was used. */
5446 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5447 tree asmspec_tree, int flags)
5451 const char *asmspec = NULL;
5452 int was_readonly = 0;
5453 bool var_definition_p = false;
5454 int saved_processing_template_decl;
5457 if (decl == error_mark_node)
5462 error ("assignment (not initialization) in declaration");
5466 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5467 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5468 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5470 type = TREE_TYPE (decl);
5471 if (type == error_mark_node)
5474 /* Assume no cleanup is required. */
5475 cleanup = NULL_TREE;
5476 saved_processing_template_decl = processing_template_decl;
5478 /* If a name was specified, get the string. */
5479 if (global_scope_p (current_binding_level))
5480 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5481 if (asmspec_tree && asmspec_tree != error_mark_node)
5482 asmspec = TREE_STRING_POINTER (asmspec_tree);
5484 if (current_class_type
5485 && CP_DECL_CONTEXT (decl) == current_class_type
5486 && TYPE_BEING_DEFINED (current_class_type)
5487 && (DECL_INITIAL (decl) || init))
5488 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5490 auto_node = type_uses_auto (type);
5493 if (init == NULL_TREE)
5495 error ("declaration of %q#D has no initializer", decl);
5496 TREE_TYPE (decl) = error_mark_node;
5499 else if (!type_dependent_expression_p (init))
5501 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5502 if (type == error_mark_node)
5507 if (processing_template_decl)
5509 bool type_dependent_p;
5511 /* Add this declaration to the statement-tree. */
5512 if (at_function_scope_p ())
5513 add_decl_expr (decl);
5515 type_dependent_p = dependent_type_p (type);
5517 if (check_for_bare_parameter_packs (init))
5520 DECL_INITIAL (decl) = NULL_TREE;
5523 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5525 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5526 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5527 TREE_CONSTANT (decl) = 1;
5530 /* Generally, initializers in templates are expanded when the
5531 template is instantiated. But, if DECL is an integral
5532 constant static data member, then it can be used in future
5533 integral constant expressions, and its value must be
5536 && DECL_CLASS_SCOPE_P (decl)
5537 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5538 && !type_dependent_p
5539 && !value_dependent_init_p (init)))
5542 DECL_INITIAL (decl) = init;
5543 if (TREE_CODE (decl) == VAR_DECL
5544 && !DECL_PRETTY_FUNCTION_P (decl)
5545 && !type_dependent_p)
5546 maybe_deduce_size_from_array_init (decl, init);
5550 if (TREE_CODE (init) == TREE_LIST)
5552 /* If the parenthesized-initializer form was used (e.g.,
5553 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5554 arguments. (There is generally only one.) We convert them
5557 for (; list; list = TREE_CHAIN (list))
5559 tree elt = TREE_VALUE (list);
5560 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5564 init = fold_non_dependent_expr (init);
5565 processing_template_decl = 0;
5568 /* Take care of TYPE_DECLs up front. */
5569 if (TREE_CODE (decl) == TYPE_DECL)
5571 if (type != error_mark_node
5572 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5574 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5575 warning (0, "shadowing previous type declaration of %q#D", decl);
5576 set_identifier_type_value (DECL_NAME (decl), decl);
5579 /* If we have installed this as the canonical typedef for this
5580 type, and that type has not been defined yet, delay emitting
5581 the debug information for it, as we will emit it later. */
5582 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5583 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5584 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5586 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5591 /* A reference will be modified here, as it is initialized. */
5592 if (! DECL_EXTERNAL (decl)
5593 && TREE_READONLY (decl)
5594 && TREE_CODE (type) == REFERENCE_TYPE)
5597 TREE_READONLY (decl) = 0;
5600 if (TREE_CODE (decl) == VAR_DECL)
5602 /* Only PODs can have thread-local storage. Other types may require
5603 various kinds of non-trivial initialization. */
5604 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5605 error ("%qD cannot be thread-local because it has non-POD type %qT",
5606 decl, TREE_TYPE (decl));
5607 /* If this is a local variable that will need a mangled name,
5608 register it now. We must do this before processing the
5609 initializer for the variable, since the initialization might
5610 require a guard variable, and since the mangled name of the
5611 guard variable will depend on the mangled name of this
5613 if (DECL_FUNCTION_SCOPE_P (decl)
5614 && TREE_STATIC (decl)
5615 && !DECL_ARTIFICIAL (decl))
5616 push_local_name (decl);
5617 /* Convert the initializer to the type of DECL, if we have not
5618 already initialized DECL. */
5619 if (!DECL_INITIALIZED_P (decl)
5620 /* If !DECL_EXTERNAL then DECL is being defined. In the
5621 case of a static data member initialized inside the
5622 class-specifier, there can be an initializer even if DECL
5623 is *not* defined. */
5624 && (!DECL_EXTERNAL (decl) || init))
5626 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5629 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5630 /* Allow libjava/prims.cc define primitive classes. */
5631 if (init != NULL_TREE
5632 || jclass == NULL_TREE
5633 || TREE_CODE (jclass) != TYPE_DECL
5634 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5635 || !same_type_ignoring_top_level_qualifiers_p
5636 (type, TREE_TYPE (TREE_TYPE (jclass))))
5637 error ("Java object %qD not allocated with %<new%>", decl);
5642 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5643 if (init_const_expr_p)
5645 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5646 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5647 TREE_CONSTANT (decl) = 1;
5650 init = check_initializer (decl, init, flags, &cleanup);
5651 /* Thread-local storage cannot be dynamically initialized. */
5652 if (DECL_THREAD_LOCAL_P (decl) && init)
5654 error ("%qD is thread-local and so cannot be dynamically "
5655 "initialized", decl);
5659 /* Check that the initializer for a static data member was a
5660 constant. Although we check in the parser that the
5661 initializer is an integral constant expression, we do not
5662 simplify division-by-zero at the point at which it
5663 occurs. Therefore, in:
5665 struct S { static const int i = 7 / 0; };
5667 we issue an error at this point. It would
5668 probably be better to forbid division by zero in
5669 integral constant expressions. */
5670 if (DECL_EXTERNAL (decl) && init)
5672 error ("%qD cannot be initialized by a non-constant expression"
5673 " when being declared", decl);
5674 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5682 The memory occupied by any object of static storage
5683 duration is zero-initialized at program startup before
5684 any other initialization takes place.
5686 We cannot create an appropriate initializer until after
5687 the type of DECL is finalized. If DECL_INITIAL is set,
5688 then the DECL is statically initialized, and any
5689 necessary zero-initialization has already been performed. */
5690 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5691 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5692 /*nelts=*/NULL_TREE,
5693 /*static_storage_p=*/true);
5694 /* Remember that the initialization for this variable has
5696 DECL_INITIALIZED_P (decl) = 1;
5697 /* This declaration is the definition of this variable,
5698 unless we are initializing a static data member within
5699 the class specifier. */
5700 if (!DECL_EXTERNAL (decl))
5701 var_definition_p = true;
5703 /* If the variable has an array type, lay out the type, even if
5704 there is no initializer. It is valid to index through the
5705 array, and we must get TYPE_ALIGN set correctly on the array
5707 else if (TREE_CODE (type) == ARRAY_TYPE)
5710 else if (TREE_CODE (decl) == FIELD_DECL
5711 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5712 error ("non-static data member %qD has Java class type", decl);
5714 /* Add this declaration to the statement-tree. This needs to happen
5715 after the call to check_initializer so that the DECL_EXPR for a
5716 reference temp is added before the DECL_EXPR for the reference itself. */
5717 if (at_function_scope_p ())
5718 add_decl_expr (decl);
5720 /* Let the middle end know about variables and functions -- but not
5721 static data members in uninstantiated class templates. */
5722 if (!saved_processing_template_decl
5723 && (TREE_CODE (decl) == VAR_DECL
5724 || TREE_CODE (decl) == FUNCTION_DECL))
5726 if (TREE_CODE (decl) == VAR_DECL)
5728 layout_var_decl (decl);
5729 maybe_commonize_var (decl);
5732 /* This needs to happen after the linkage is set. */
5733 determine_visibility (decl);
5735 if (var_definition_p && TREE_STATIC (decl))
5737 /* If a TREE_READONLY variable needs initialization
5738 at runtime, it is no longer readonly and we need to
5739 avoid MEM_READONLY_P being set on RTL created for it. */
5742 if (TREE_READONLY (decl))
5743 TREE_READONLY (decl) = 0;
5746 else if (was_readonly)
5747 TREE_READONLY (decl) = 1;
5750 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5752 /* Check for abstractness of the type. Notice that there is no
5753 need to strip array types here since the check for those types
5754 is already done within create_array_type_for_decl. */
5755 if (TREE_CODE (type) == FUNCTION_TYPE
5756 || TREE_CODE (type) == METHOD_TYPE)
5757 abstract_virtuals_error (decl, TREE_TYPE (type));
5759 abstract_virtuals_error (decl, type);
5761 if (TREE_TYPE (decl) == error_mark_node)
5762 /* No initialization required. */
5764 else if (TREE_CODE (decl) == FUNCTION_DECL)
5768 if (init == ridpointers[(int)RID_DELETE])
5770 /* fixme check this is 1st decl */
5771 DECL_DELETED_FN (decl) = 1;
5772 DECL_DECLARED_INLINE_P (decl) = 1;
5773 DECL_INITIAL (decl) = error_mark_node;
5775 else if (init == ridpointers[(int)RID_DEFAULT])
5777 if (!defaultable_fn_p (decl))
5778 error ("%qD cannot be defaulted", decl);
5781 /* An out-of-class default definition is defined at
5782 the point where it is explicitly defaulted. */
5783 DECL_DEFAULTED_FN (decl) = 1;
5784 if (DECL_INITIAL (decl) == error_mark_node)
5785 synthesize_method (decl);
5789 error ("function %q#D is initialized like a variable", decl);
5791 /* else no initialization required. */
5793 else if (DECL_EXTERNAL (decl)
5794 && ! (DECL_LANG_SPECIFIC (decl)
5795 && DECL_NOT_REALLY_EXTERN (decl)))
5798 DECL_INITIAL (decl) = init;
5800 /* A variable definition. */
5801 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5802 /* Initialize the local variable. */
5803 initialize_local_var (decl, init);
5805 /* If a variable is defined, and then a subsequent
5806 definition with external linkage is encountered, we will
5807 get here twice for the same variable. We want to avoid
5808 calling expand_static_init more than once. For variables
5809 that are not static data members, we can call
5810 expand_static_init only when we actually process the
5811 initializer. It is not legal to redeclare a static data
5812 member, so this issue does not arise in that case. */
5813 else if (var_definition_p && TREE_STATIC (decl))
5814 expand_static_init (decl, init);
5817 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5818 reference, insert it in the statement-tree now. */
5820 push_cleanup (decl, cleanup, false);
5823 processing_template_decl = saved_processing_template_decl;
5826 TREE_READONLY (decl) = 1;
5828 /* If this was marked 'used', be sure it will be output. */
5829 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5830 mark_decl_referenced (decl);
5833 /* This is here for a midend callback from c-common.c. */
5836 finish_decl (tree decl, tree init, tree asmspec_tree)
5838 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5841 /* Returns a declaration for a VAR_DECL as if:
5843 extern "C" TYPE NAME;
5845 had been seen. Used to create compiler-generated global
5849 declare_global_var (tree name, tree type)
5853 push_to_top_level ();
5854 decl = build_decl (VAR_DECL, name, type);
5855 TREE_PUBLIC (decl) = 1;
5856 DECL_EXTERNAL (decl) = 1;
5857 DECL_ARTIFICIAL (decl) = 1;
5858 /* If the user has explicitly declared this variable (perhaps
5859 because the code we are compiling is part of a low-level runtime
5860 library), then it is possible that our declaration will be merged
5861 with theirs by pushdecl. */
5862 decl = pushdecl (decl);
5863 finish_decl (decl, NULL_TREE, NULL_TREE);
5864 pop_from_top_level ();
5869 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5870 if "__cxa_atexit" is not being used) corresponding to the function
5871 to be called when the program exits. */
5874 get_atexit_fn_ptr_type (void)
5879 if (!atexit_fn_ptr_type_node)
5881 if (flag_use_cxa_atexit
5882 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5883 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5884 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5886 /* The parameter to "atexit" is "void (*)(void)". */
5887 arg_types = void_list_node;
5889 fn_type = build_function_type (void_type_node, arg_types);
5890 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5893 return atexit_fn_ptr_type_node;
5896 /* Returns a pointer to the `atexit' function. Note that if
5897 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5898 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5901 get_atexit_node (void)
5908 bool use_aeabi_atexit;
5913 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5915 /* The declaration for `__cxa_atexit' is:
5917 int __cxa_atexit (void (*)(void *), void *, void *)
5919 We build up the argument types and then then function type
5922 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5923 /* First, build the pointer-to-function type for the first
5925 fn_ptr_type = get_atexit_fn_ptr_type ();
5926 /* Then, build the rest of the argument types. */
5927 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5928 if (use_aeabi_atexit)
5930 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5931 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5935 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5936 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5938 /* And the final __cxa_atexit type. */
5939 fn_type = build_function_type (integer_type_node, arg_types);
5940 fn_ptr_type = build_pointer_type (fn_type);
5941 if (use_aeabi_atexit)
5942 name = "__aeabi_atexit";
5944 name = "__cxa_atexit";
5948 /* The declaration for `atexit' is:
5950 int atexit (void (*)());
5952 We build up the argument types and then then function type
5954 fn_ptr_type = get_atexit_fn_ptr_type ();
5955 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5956 /* Build the final atexit type. */
5957 fn_type = build_function_type (integer_type_node, arg_types);
5961 /* Now, build the function declaration. */
5962 push_lang_context (lang_name_c);
5963 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5964 mark_used (atexit_fndecl);
5965 pop_lang_context ();
5966 atexit_node = decay_conversion (atexit_fndecl);
5971 /* Returns the __dso_handle VAR_DECL. */
5974 get_dso_handle_node (void)
5976 if (dso_handle_node)
5977 return dso_handle_node;
5979 /* Declare the variable. */
5980 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5983 return dso_handle_node;
5986 /* Begin a new function with internal linkage whose job will be simply
5987 to destroy some particular variable. */
5989 static GTY(()) int start_cleanup_cnt;
5992 start_cleanup_fn (void)
5997 bool use_cxa_atexit = flag_use_cxa_atexit
5998 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6000 push_to_top_level ();
6002 /* No need to mangle this. */
6003 push_lang_context (lang_name_c);
6005 /* Build the name of the function. */
6006 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6007 /* Build the function declaration. */
6008 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6009 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6010 /* It's a function with internal linkage, generated by the
6012 TREE_PUBLIC (fndecl) = 0;
6013 DECL_ARTIFICIAL (fndecl) = 1;
6014 /* Make the function `inline' so that it is only emitted if it is
6015 actually needed. It is unlikely that it will be inlined, since
6016 it is only called via a function pointer, but we avoid unnecessary
6017 emissions this way. */
6018 DECL_DECLARED_INLINE_P (fndecl) = 1;
6019 DECL_INTERFACE_KNOWN (fndecl) = 1;
6020 /* Build the parameter. */
6025 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6026 DECL_CONTEXT (parmdecl) = fndecl;
6027 TREE_USED (parmdecl) = 1;
6028 DECL_ARGUMENTS (fndecl) = parmdecl;
6032 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6034 pop_lang_context ();
6036 return current_function_decl;
6039 /* Finish the cleanup function begun by start_cleanup_fn. */
6042 end_cleanup_fn (void)
6044 expand_or_defer_fn (finish_function (0));
6046 pop_from_top_level ();
6049 /* Generate code to handle the destruction of DECL, an object with
6050 static storage duration. */
6053 register_dtor_fn (tree decl)
6062 type = TREE_TYPE (decl);
6063 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6064 return void_zero_node;
6066 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6067 a class object, we can just pass the destructor to
6068 "__cxa_atexit"; we don't have to build a temporary function to do
6070 use_dtor = (flag_use_cxa_atexit
6071 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6072 && CLASS_TYPE_P (type));
6077 /* Find the destructor. */
6078 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6079 gcc_assert (idx >= 0);
6080 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6081 /* Make sure it is accessible. */
6082 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6086 /* Call build_cleanup before we enter the anonymous function so
6087 that any access checks will be done relative to the current
6088 scope, rather than the scope of the anonymous function. */
6089 build_cleanup (decl);
6091 /* Now start the function. */
6092 cleanup = start_cleanup_fn ();
6094 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6095 to the original function, rather than the anonymous one. That
6096 will make the back end think that nested functions are in use,
6097 which causes confusion. */
6098 push_deferring_access_checks (dk_no_check);
6099 fcall = build_cleanup (decl);
6100 pop_deferring_access_checks ();
6102 /* Create the body of the anonymous function. */
6103 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6104 finish_expr_stmt (fcall);
6105 finish_compound_stmt (compound_stmt);
6109 /* Call atexit with the cleanup function. */
6110 mark_used (cleanup);
6111 cleanup = build_address (cleanup);
6112 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6118 /* We must convert CLEANUP to the type that "__cxa_atexit"
6120 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6121 /* "__cxa_atexit" will pass the address of DECL to the
6122 cleanup function. */
6124 addr = build_address (decl);
6125 /* The declared type of the parameter to "__cxa_atexit" is
6126 "void *". For plain "T*", we could just let the
6127 machinery in cp_build_function_call convert it -- but if the
6128 type is "cv-qualified T *", then we need to convert it
6129 before passing it in, to avoid spurious errors. */
6130 addr = build_nop (ptr_type_node, addr);
6133 /* Since the cleanup functions we build ignore the address
6134 they're given, there's no reason to pass the actual address
6135 in, and, in general, it's cheaper to pass NULL than any
6137 addr = null_pointer_node;
6138 args = tree_cons (NULL_TREE,
6139 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6140 tf_warning_or_error),
6142 if (targetm.cxx.use_aeabi_atexit ())
6144 args = tree_cons (NULL_TREE, cleanup, args);
6145 args = tree_cons (NULL_TREE, addr, args);
6149 args = tree_cons (NULL_TREE, addr, args);
6150 args = tree_cons (NULL_TREE, cleanup, args);
6154 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6155 return cp_build_function_call (get_atexit_node (), args,
6156 tf_warning_or_error);
6159 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6160 is its initializer. Generate code to handle the construction
6161 and destruction of DECL. */
6164 expand_static_init (tree decl, tree init)
6166 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6167 gcc_assert (TREE_STATIC (decl));
6169 /* Some variables require no initialization. */
6171 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6172 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6175 if (DECL_FUNCTION_SCOPE_P (decl))
6177 /* Emit code to perform this initialization but once. */
6178 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6179 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6180 tree guard, guard_addr;
6181 tree acquire_fn, release_fn, abort_fn;
6184 /* Emit code to perform this initialization but once. This code
6187 static <type> guard;
6188 if (!guard.first_byte) {
6189 if (__cxa_guard_acquire (&guard)) {
6192 // Do initialization.
6193 flag = true; __cxa_guard_release (&guard);
6194 // Register variable for destruction at end of program.
6196 if (!flag) __cxa_guard_abort (&guard);
6200 Note that the `flag' variable is only set to 1 *after* the
6201 initialization is complete. This ensures that an exception,
6202 thrown during the construction, will cause the variable to
6203 reinitialized when we pass through this code again, as per:
6207 If the initialization exits by throwing an exception, the
6208 initialization is not complete, so it will be tried again
6209 the next time control enters the declaration.
6211 This process should be thread-safe, too; multiple threads
6212 should not be able to initialize the variable more than
6215 /* Create the guard variable. */
6216 guard = get_guard (decl);
6218 /* This optimization isn't safe on targets with relaxed memory
6219 consistency. On such targets we force synchronization in
6220 __cxa_guard_acquire. */
6221 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6223 /* Begin the conditional initialization. */
6224 if_stmt = begin_if_stmt ();
6225 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6226 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6229 if (flag_threadsafe_statics)
6231 guard_addr = build_address (guard);
6233 acquire_fn = get_identifier ("__cxa_guard_acquire");
6234 release_fn = get_identifier ("__cxa_guard_release");
6235 abort_fn = get_identifier ("__cxa_guard_abort");
6236 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6238 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6240 tree vfntype = build_function_type (void_type_node, argtypes);
6241 acquire_fn = push_library_fn
6242 (acquire_fn, build_function_type (integer_type_node, argtypes),
6244 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6245 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6249 release_fn = identifier_global_value (release_fn);
6250 abort_fn = identifier_global_value (abort_fn);
6253 inner_if_stmt = begin_if_stmt ();
6254 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6257 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6258 begin = get_target_expr (boolean_false_node);
6259 flag = TARGET_EXPR_SLOT (begin);
6261 TARGET_EXPR_CLEANUP (begin)
6262 = build3 (COND_EXPR, void_type_node, flag,
6264 build_call_n (abort_fn, 1, guard_addr));
6265 CLEANUP_EH_ONLY (begin) = 1;
6267 /* Do the initialization itself. */
6268 init = add_stmt_to_compound (begin, init);
6269 init = add_stmt_to_compound
6270 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6271 init = add_stmt_to_compound
6272 (init, build_call_n (release_fn, 1, guard_addr));
6275 init = add_stmt_to_compound (init, set_guard (guard));
6277 /* Use atexit to register a function for destroying this static
6279 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6281 finish_expr_stmt (init);
6283 if (flag_threadsafe_statics)
6285 finish_compound_stmt (inner_then_clause);
6286 finish_then_clause (inner_if_stmt);
6287 finish_if_stmt (inner_if_stmt);
6290 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6292 finish_compound_stmt (then_clause);
6293 finish_then_clause (if_stmt);
6294 finish_if_stmt (if_stmt);
6298 static_aggregates = tree_cons (init, decl, static_aggregates);
6302 /* Make TYPE a complete type based on INITIAL_VALUE.
6303 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6304 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6305 3 if the initializer list is empty (in pedantic mode). */
6308 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6311 tree type, elt_type;
6315 unsigned HOST_WIDE_INT i;
6318 /* An array of character type can be initialized from a
6319 brace-enclosed string constant.
6321 FIXME: this code is duplicated from reshape_init. Probably
6322 we should just call reshape_init here? */
6323 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6324 && TREE_CODE (initial_value) == CONSTRUCTOR
6325 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6327 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6328 tree value = VEC_index (constructor_elt, v, 0)->value;
6330 if (TREE_CODE (value) == STRING_CST
6331 && VEC_length (constructor_elt, v) == 1)
6332 initial_value = value;
6335 /* If any of the elements are parameter packs, we can't actually
6336 complete this type now because the array size is dependent. */
6337 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6339 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6342 if (PACK_EXPANSION_P (value))
6348 failure = complete_array_type (ptype, initial_value, do_default);
6350 /* We can create the array before the element type is complete, which
6351 means that we didn't have these two bits set in the original type
6352 either. In completing the type, we are expected to propagate these
6353 bits. See also complete_type which does the same thing for arrays
6356 if (TYPE_DOMAIN (type))
6358 elt_type = TREE_TYPE (type);
6359 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6360 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6361 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6367 /* Return zero if something is declared to be a member of type
6368 CTYPE when in the context of CUR_TYPE. STRING is the error
6369 message to print in that case. Otherwise, quietly return 1. */
6372 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6374 if (ctype && ctype != cur_type)
6376 if (flags == DTOR_FLAG)
6377 error ("destructor for alien class %qT cannot be a member", ctype);
6379 error ("constructor for alien class %qT cannot be a member", ctype);
6385 /* Subroutine of `grokdeclarator'. */
6387 /* Generate errors possibly applicable for a given set of specifiers.
6388 This is for ARM $7.1.2. */
6391 bad_specifiers (tree object,
6400 error ("%qD declared as a %<virtual%> %s", object, type);
6402 error ("%qD declared as an %<inline%> %s", object, type);
6404 error ("%<const%> and %<volatile%> function specifiers on "
6405 "%qD invalid in %s declaration",
6408 error ("%q+D declared as a friend", object);
6410 && (TREE_CODE (object) == TYPE_DECL
6411 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6412 && !TYPE_REFFN_P (TREE_TYPE (object))
6413 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6414 error ("%q+D declared with an exception specification", object);
6417 /* DECL is a member function or static data member and is presently
6418 being defined. Check that the definition is taking place in a
6422 check_class_member_definition_namespace (tree decl)
6424 /* These checks only apply to member functions and static data
6426 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6427 || TREE_CODE (decl) == VAR_DECL);
6428 /* We check for problems with specializations in pt.c in
6429 check_specialization_namespace, where we can issue better
6431 if (processing_specialization)
6433 /* There are no restrictions on the placement of
6434 explicit instantiations. */
6435 if (processing_explicit_instantiation)
6439 A member function definition that appears outside of the
6440 class definition shall appear in a namespace scope enclosing
6441 the class definition.
6445 The definition for a static data member shall appear in a
6446 namespace scope enclosing the member's class definition. */
6447 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6448 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6449 decl, DECL_CONTEXT (decl));
6452 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6453 METHOD_TYPE for a non-static member function; QUALS are the
6454 cv-qualifiers that apply to the function. */
6457 build_this_parm (tree type, cp_cv_quals quals)
6462 cp_cv_quals this_quals;
6464 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6465 /* The `this' parameter is implicitly `const'; it cannot be
6467 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6468 qual_type = cp_build_qualified_type (this_type, this_quals);
6469 parm = build_artificial_parm (this_identifier, qual_type);
6470 cp_apply_type_quals_to_decl (this_quals, parm);
6474 /* CTYPE is class type, or null if non-class.
6475 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6477 DECLARATOR is the function's name.
6478 PARMS is a chain of PARM_DECLs for the function.
6479 VIRTUALP is truthvalue of whether the function is virtual or not.
6480 FLAGS are to be passed through to `grokclassfn'.
6481 QUALS are qualifiers indicating whether the function is `const'
6483 RAISES is a list of exceptions that this function can raise.
6484 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6485 not look, and -1 if we should not call `grokclassfn' at all.
6487 SFK is the kind of special function (if any) for the new function.
6489 Returns `NULL_TREE' if something goes wrong, after issuing
6490 applicable error messages. */
6493 grokfndecl (tree ctype,
6497 tree orig_declarator,
6499 enum overload_flags flags,
6506 special_function_kind sfk,
6511 location_t location)
6514 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6518 type = build_exception_variant (type, raises);
6520 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6522 /* If we have an explicit location, use it, otherwise use whatever
6523 build_lang_decl used (probably input_location). */
6524 if (location != UNKNOWN_LOCATION)
6525 DECL_SOURCE_LOCATION (decl) = location;
6527 if (TREE_CODE (type) == METHOD_TYPE)
6530 parm = build_this_parm (type, quals);
6531 TREE_CHAIN (parm) = parms;
6534 DECL_ARGUMENTS (decl) = parms;
6535 /* Propagate volatile out from type to decl. */
6536 if (TYPE_VOLATILE (type))
6537 TREE_THIS_VOLATILE (decl) = 1;
6539 /* Setup decl according to sfk. */
6542 case sfk_constructor:
6543 case sfk_copy_constructor:
6544 DECL_CONSTRUCTOR_P (decl) = 1;
6546 case sfk_destructor:
6547 DECL_DESTRUCTOR_P (decl) = 1;
6553 /* If pointers to member functions use the least significant bit to
6554 indicate whether a function is virtual, ensure a pointer
6555 to this function will have that bit clear. */
6556 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6557 && TREE_CODE (type) == METHOD_TYPE
6558 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6559 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6562 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6566 ("defining explicit specialization %qD in friend declaration",
6570 tree fns = TREE_OPERAND (orig_declarator, 0);
6571 tree args = TREE_OPERAND (orig_declarator, 1);
6573 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6575 /* Something like `template <class T> friend void f<T>()'. */
6576 error ("invalid use of template-id %qD in declaration "
6577 "of primary template",
6583 /* A friend declaration of the form friend void f<>(). Record
6584 the information in the TEMPLATE_ID_EXPR. */
6585 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6587 if (TREE_CODE (fns) == COMPONENT_REF)
6589 /* Due to bison parser ickiness, we will have already looked
6590 up an operator_name or PFUNCNAME within the current class
6591 (see template_id in parse.y). If the current class contains
6592 such a name, we'll get a COMPONENT_REF here. Undo that. */
6594 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6595 == current_class_type);
6596 fns = TREE_OPERAND (fns, 1);
6598 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6599 || TREE_CODE (fns) == OVERLOAD);
6600 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6602 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6603 if (TREE_PURPOSE (t)
6604 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6606 error ("default arguments are not allowed in declaration "
6607 "of friend template specialization %qD",
6614 error ("%<inline%> is not allowed in declaration of friend "
6615 "template specialization %qD",
6622 /* If this decl has namespace scope, set that up. */
6624 set_decl_namespace (decl, in_namespace, friendp);
6626 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6628 /* `main' and builtins have implicit 'C' linkage. */
6629 if ((MAIN_NAME_P (declarator)
6630 || (IDENTIFIER_LENGTH (declarator) > 10
6631 && IDENTIFIER_POINTER (declarator)[0] == '_'
6632 && IDENTIFIER_POINTER (declarator)[1] == '_'
6633 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6634 && current_lang_name == lang_name_cplusplus
6635 && ctype == NULL_TREE
6636 /* NULL_TREE means global namespace. */
6637 && DECL_CONTEXT (decl) == NULL_TREE)
6638 SET_DECL_LANGUAGE (decl, lang_c);
6640 /* Should probably propagate const out from type to decl I bet (mrs). */
6643 DECL_STATIC_FUNCTION_P (decl) = 1;
6644 DECL_CONTEXT (decl) = ctype;
6649 DECL_CONTEXT (decl) = ctype;
6651 check_class_member_definition_namespace (decl);
6654 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6656 if (processing_template_decl)
6657 error ("cannot declare %<::main%> to be a template");
6659 error ("cannot declare %<::main%> to be inline");
6661 error ("cannot declare %<::main%> to be static");
6666 /* Members of anonymous types and local classes have no linkage; make
6667 them internal. If a typedef is made later, this will be changed. */
6668 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6669 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6674 /* [basic.link]: A name with no linkage (notably, the name of a class
6675 or enumeration declared in a local scope) shall not be used to
6676 declare an entity with linkage.
6678 Only check this for public decls for now. See core 319, 389. */
6679 t = no_linkage_check (TREE_TYPE (decl),
6680 /*relaxed_p=*/false);
6683 if (TYPE_ANONYMOUS_P (t))
6685 if (DECL_EXTERN_C_P (decl))
6686 /* Allow this; it's pretty common in C. */;
6689 permerror (input_location, "non-local function %q#D uses anonymous type",
6691 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6692 permerror (input_location, "%q+#D does not refer to the unqualified "
6693 "type, so it is not used for linkage",
6698 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6702 TREE_PUBLIC (decl) = publicp;
6705 DECL_INTERFACE_KNOWN (decl) = 1;
6706 DECL_NOT_REALLY_EXTERN (decl) = 1;
6709 /* If the declaration was declared inline, mark it as such. */
6711 DECL_DECLARED_INLINE_P (decl) = 1;
6713 DECL_EXTERNAL (decl) = 1;
6714 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6717 ? G_("static member function %qD cannot have cv-qualifier")
6718 : G_("non-member function %qD cannot have cv-qualifier"),
6720 quals = TYPE_UNQUALIFIED;
6723 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6724 && !grok_op_properties (decl, /*complain=*/true))
6727 if (ctype && decl_function_context (decl))
6728 DECL_NO_STATIC_CHAIN (decl) = 1;
6731 /* Make the init_value nonzero so pushdecl knows this is not
6732 tentative. error_mark_node is replaced later with the BLOCK. */
6733 DECL_INITIAL (decl) = error_mark_node;
6735 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6736 TREE_NOTHROW (decl) = 1;
6738 /* Caller will do the rest of this. */
6742 if (ctype != NULL_TREE)
6743 grokclassfn (ctype, decl, flags);
6745 decl = check_explicit_specialization (orig_declarator, decl,
6748 4 * (friendp != 0));
6749 if (decl == error_mark_node)
6754 cplus_decl_attributes (&decl, *attrlist, 0);
6755 *attrlist = NULL_TREE;
6758 /* Check main's type after attributes have been applied. */
6759 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6761 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6764 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6766 error ("%<::main%> must return %<int%>");
6767 newtype = build_function_type (integer_type_node, oldtypeargs);
6768 TREE_TYPE (decl) = newtype;
6771 check_main_parameter_types (decl);
6774 if (ctype != NULL_TREE
6775 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6778 tree old_decl = check_classfn (ctype, decl,
6779 (processing_template_decl
6780 > template_class_depth (ctype))
6781 ? current_template_parms
6784 if (old_decl == error_mark_node)
6792 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6793 /* Because grokfndecl is always supposed to return a
6794 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6795 here. We depend on our callers to figure out that its
6796 really a template that's being returned. */
6797 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6799 if (DECL_STATIC_FUNCTION_P (old_decl)
6800 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6801 /* Remove the `this' parm added by grokclassfn.
6802 XXX Isn't this done in start_function, too? */
6803 revert_static_member_fn (decl);
6804 if (DECL_ARTIFICIAL (old_decl))
6806 error ("definition of implicitly-declared %qD", old_decl);
6810 /* Since we've smashed OLD_DECL to its
6811 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6812 if (TREE_CODE (decl) == TEMPLATE_DECL)
6813 decl = DECL_TEMPLATE_RESULT (decl);
6815 /* Attempt to merge the declarations. This can fail, in
6816 the case of some invalid specialization declarations. */
6817 pushed_scope = push_scope (ctype);
6818 ok = duplicate_decls (decl, old_decl, friendp);
6820 pop_scope (pushed_scope);
6823 error ("no %q#D member function declared in class %qT",
6831 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6834 if (ctype == NULL_TREE || check)
6838 DECL_VIRTUAL_P (decl) = 1;
6843 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6844 the linkage that DECL will receive in the object file. */
6847 set_linkage_for_static_data_member (tree decl)
6849 /* A static data member always has static storage duration and
6850 external linkage. Note that static data members are forbidden in
6851 local classes -- the only situation in which a class has
6852 non-external linkage. */
6853 TREE_PUBLIC (decl) = 1;
6854 TREE_STATIC (decl) = 1;
6855 /* For non-template classes, static data members are always put
6856 out in exactly those files where they are defined, just as
6857 with ordinary namespace-scope variables. */
6858 if (!processing_template_decl)
6859 DECL_INTERFACE_KNOWN (decl) = 1;
6862 /* Create a VAR_DECL named NAME with the indicated TYPE.
6864 If SCOPE is non-NULL, it is the class type or namespace containing
6865 the variable. If SCOPE is NULL, the variable should is created in
6866 the innermost enclosings scope. */
6869 grokvardecl (tree type,
6871 const cp_decl_specifier_seq *declspecs,
6877 tree explicit_scope;
6879 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6881 /* Compute the scope in which to place the variable, but remember
6882 whether or not that scope was explicitly specified by the user. */
6883 explicit_scope = scope;
6886 /* An explicit "extern" specifier indicates a namespace-scope
6888 if (declspecs->storage_class == sc_extern)
6889 scope = current_namespace;
6890 else if (!at_function_scope_p ())
6891 scope = current_scope ();
6895 && (/* If the variable is a namespace-scope variable declared in a
6896 template, we need DECL_LANG_SPECIFIC. */
6897 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6898 /* Similarly for namespace-scope variables with language linkage
6900 || (TREE_CODE (scope) == NAMESPACE_DECL
6901 && current_lang_name != lang_name_cplusplus)
6902 /* Similarly for static data members. */
6904 decl = build_lang_decl (VAR_DECL, name, type);
6906 decl = build_decl (VAR_DECL, name, type);
6908 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6909 set_decl_namespace (decl, explicit_scope, 0);
6911 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6913 if (declspecs->storage_class == sc_extern)
6915 DECL_THIS_EXTERN (decl) = 1;
6916 DECL_EXTERNAL (decl) = !initialized;
6919 if (DECL_CLASS_SCOPE_P (decl))
6921 set_linkage_for_static_data_member (decl);
6922 /* This function is only called with out-of-class definitions. */
6923 DECL_EXTERNAL (decl) = 0;
6924 check_class_member_definition_namespace (decl);
6926 /* At top level, either `static' or no s.c. makes a definition
6927 (perhaps tentative), and absence of `static' makes it public. */
6928 else if (toplevel_bindings_p ())
6930 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6931 && (DECL_THIS_EXTERN (decl) || ! constp));
6932 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6934 /* Not at top level, only `static' makes a static definition. */
6937 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6938 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6941 if (declspecs->specs[(int)ds_thread])
6942 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6944 if (TREE_PUBLIC (decl))
6946 /* [basic.link]: A name with no linkage (notably, the name of a class
6947 or enumeration declared in a local scope) shall not be used to
6948 declare an entity with linkage.
6950 Only check this for public decls for now. */
6951 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6954 if (TYPE_ANONYMOUS_P (t))
6956 if (DECL_EXTERN_C_P (decl))
6957 /* Allow this; it's pretty common in C. */
6961 /* DRs 132, 319 and 389 seem to indicate types with
6962 no linkage can only be used to declare extern "C"
6963 entities. Since it's not always an error in the
6964 ISO C++ 90 Standard, we only issue a warning. */
6965 warning (0, "non-local variable %q#D uses anonymous type",
6967 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6968 warning (0, "%q+#D does not refer to the unqualified "
6969 "type, so it is not used for linkage",
6974 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6978 DECL_INTERFACE_KNOWN (decl) = 1;
6983 /* Create and return a canonical pointer to member function type, for
6984 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6987 build_ptrmemfunc_type (tree type)
6991 tree unqualified_variant = NULL_TREE;
6993 if (type == error_mark_node)
6996 /* If a canonical type already exists for this type, use it. We use
6997 this method instead of type_hash_canon, because it only does a
6998 simple equality check on the list of field members. */
7000 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7003 /* Make sure that we always have the unqualified pointer-to-member
7005 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7007 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7009 t = make_class_type (RECORD_TYPE);
7010 xref_basetypes (t, NULL_TREE);
7012 /* Let the front end know this is a pointer to member function... */
7013 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7014 /* ... and not really a class type. */
7015 SET_CLASS_TYPE_P (t, 0);
7017 field = build_decl (FIELD_DECL, pfn_identifier, type);
7020 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
7021 TREE_CHAIN (field) = fields;
7024 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7026 /* Zap out the name so that the back end will give us the debugging
7027 information for this anonymous RECORD_TYPE. */
7028 TYPE_NAME (t) = NULL_TREE;
7030 /* If this is not the unqualified form of this pointer-to-member
7031 type, set the TYPE_MAIN_VARIANT for this type to be the
7032 unqualified type. Since they are actually RECORD_TYPEs that are
7033 not variants of each other, we must do this manually. */
7034 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7036 t = build_qualified_type (t, cp_type_quals (type));
7037 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7038 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7039 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7040 TREE_TYPE (TYPE_BINFO (t)) = t;
7043 /* Cache this pointer-to-member type so that we can find it again
7045 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7047 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7048 SET_TYPE_STRUCTURAL_EQUALITY (t);
7049 else if (TYPE_CANONICAL (type) != type)
7050 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7055 /* Create and return a pointer to data member type. */
7058 build_ptrmem_type (tree class_type, tree member_type)
7060 if (TREE_CODE (member_type) == METHOD_TYPE)
7064 arg_types = TYPE_ARG_TYPES (member_type);
7065 class_type = (cp_build_qualified_type
7067 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7069 = build_method_type_directly (class_type,
7070 TREE_TYPE (member_type),
7071 TREE_CHAIN (arg_types));
7072 return build_ptrmemfunc_type (build_pointer_type (member_type));
7076 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7077 return build_offset_type (class_type, member_type);
7081 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7082 Check to see that the definition is valid. Issue appropriate error
7083 messages. Return 1 if the definition is particularly bad, or 0
7087 check_static_variable_definition (tree decl, tree type)
7089 /* Motion 10 at San Diego: If a static const integral data member is
7090 initialized with an integral constant expression, the initializer
7091 may appear either in the declaration (within the class), or in
7092 the definition, but not both. If it appears in the class, the
7093 member is a member constant. The file-scope definition is always
7095 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7097 error ("invalid in-class initialization of static data member "
7098 "of non-integral type %qT",
7100 /* If we just return the declaration, crashes will sometimes
7101 occur. We therefore return void_type_node, as if this were a
7102 friend declaration, to cause callers to completely ignore
7103 this declaration. */
7106 else if (!CP_TYPE_CONST_P (type))
7107 error ("ISO C++ forbids in-class initialization of non-const "
7108 "static member %qD",
7110 else if (!INTEGRAL_TYPE_P (type))
7111 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7112 "%qD of non-integral type %qT", decl, type);
7117 /* Given the SIZE (i.e., number of elements) in an array, compute an
7118 appropriate index type for the array. If non-NULL, NAME is the
7119 name of the thing being declared. */
7122 compute_array_index_type (tree name, tree size)
7126 tree abi_1_itype = NULL_TREE;
7128 if (error_operand_p (size))
7129 return error_mark_node;
7131 type = TREE_TYPE (size);
7132 /* The array bound must be an integer type. */
7133 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7136 error ("size of array %qD has non-integral type %qT", name, type);
7138 error ("size of array has non-integral type %qT", type);
7139 size = integer_one_node;
7140 type = TREE_TYPE (size);
7143 if (value_dependent_expression_p (size))
7145 /* We cannot do any checking for a value-dependent SIZE. Just
7146 build the index type and mark that it requires structural
7148 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7149 size, integer_one_node));
7150 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7154 if (!abi_version_at_least (2) && processing_template_decl)
7155 /* For abi-1, we handled all instances in templates the same way,
7156 even when they were non-dependent. This affects the manglings
7157 produced. So, we do the normal checking for non-dependent
7158 sizes, but at the end we'll return the same type that abi-1
7159 would have, but with TYPE_CANONICAL set to the "right"
7160 value that the current ABI would provide. */
7161 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7162 size, integer_one_node));
7164 /* The size might be the result of a cast. */
7165 STRIP_TYPE_NOPS (size);
7167 /* It might be a const variable or enumeration constant. */
7168 size = integral_constant_value (size);
7170 /* Normally, the array-bound will be a constant. */
7171 if (TREE_CODE (size) == INTEGER_CST)
7173 /* Check to see if the array bound overflowed. Make that an
7174 error, no matter how generous we're being. */
7175 constant_expression_error (size);
7177 /* An array must have a positive number of elements. */
7178 if (INT_CST_LT (size, integer_zero_node))
7181 error ("size of array %qD is negative", name);
7183 error ("size of array is negative");
7184 size = integer_one_node;
7186 /* As an extension we allow zero-sized arrays. We always allow
7187 them in system headers because glibc uses them. */
7188 else if (integer_zerop (size) && !in_system_header)
7191 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7193 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7196 else if (TREE_CONSTANT (size))
7198 /* `(int) &fn' is not a valid array bound. */
7200 error ("size of array %qD is not an integral constant-expression",
7203 error ("size of array is not an integral constant-expression");
7204 size = integer_one_node;
7206 else if (pedantic && warn_vla != 0)
7209 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7211 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7213 else if (warn_vla > 0)
7217 "variable length array %qD is used", name);
7220 "variable length array is used");
7223 if (processing_template_decl && !TREE_CONSTANT (size))
7224 /* A variable sized array. */
7225 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7228 HOST_WIDE_INT saved_processing_template_decl;
7230 /* Compute the index of the largest element in the array. It is
7231 one less than the number of elements in the array. We save
7232 and restore PROCESSING_TEMPLATE_DECL so that computations in
7233 cp_build_binary_op will be appropriately folded. */
7234 saved_processing_template_decl = processing_template_decl;
7235 processing_template_decl = 0;
7236 itype = cp_build_binary_op (input_location,
7238 cp_convert (ssizetype, size),
7239 cp_convert (ssizetype, integer_one_node),
7240 tf_warning_or_error);
7241 itype = fold (itype);
7242 processing_template_decl = saved_processing_template_decl;
7244 if (!TREE_CONSTANT (itype))
7245 /* A variable sized array. */
7246 itype = variable_size (itype);
7247 /* Make sure that there was no overflow when creating to a signed
7248 index type. (For example, on a 32-bit machine, an array with
7249 size 2^32 - 1 is too big.) */
7250 else if (TREE_CODE (itype) == INTEGER_CST
7251 && TREE_OVERFLOW (itype))
7253 error ("overflow in array dimension");
7254 TREE_OVERFLOW (itype) = 0;
7258 /* Create and return the appropriate index type. */
7261 tree t = build_index_type (itype);
7262 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7266 return build_index_type (itype);
7269 /* Returns the scope (if any) in which the entity declared by
7270 DECLARATOR will be located. If the entity was declared with an
7271 unqualified name, NULL_TREE is returned. */
7274 get_scope_of_declarator (const cp_declarator *declarator)
7276 while (declarator && declarator->kind != cdk_id)
7277 declarator = declarator->declarator;
7279 /* If the declarator-id is a SCOPE_REF, the scope in which the
7280 declaration occurs is the first operand. */
7282 && declarator->u.id.qualifying_scope)
7283 return declarator->u.id.qualifying_scope;
7285 /* Otherwise, the declarator is not a qualified name; the entity will
7286 be declared in the current scope. */
7290 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7291 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7295 create_array_type_for_decl (tree name, tree type, tree size)
7297 tree itype = NULL_TREE;
7298 const char* error_msg;
7300 /* If things have already gone awry, bail now. */
7301 if (type == error_mark_node || size == error_mark_node)
7302 return error_mark_node;
7304 /* Assume that everything will go OK. */
7307 /* There are some types which cannot be array elements. */
7308 switch (TREE_CODE (type))
7311 error_msg = "array of void";
7315 error_msg = "array of functions";
7318 case REFERENCE_TYPE:
7319 error_msg = "array of references";
7323 error_msg = "array of function members";
7330 /* If something went wrong, issue an error-message and return. */
7334 error ("declaration of %qD as %s", name, error_msg);
7336 error ("creating %s", error_msg);
7338 return error_mark_node;
7343 The constant expressions that specify the bounds of the arrays
7344 can be omitted only for the first member of the sequence. */
7345 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7348 error ("declaration of %qD as multidimensional array must "
7349 "have bounds for all dimensions except the first",
7352 error ("multidimensional array must have bounds for all "
7353 "dimensions except the first");
7355 return error_mark_node;
7358 /* Figure out the index type for the array. */
7360 itype = compute_array_index_type (name, size);
7363 T is called the array element type; this type shall not be [...] an
7364 abstract class type. */
7365 abstract_virtuals_error (name, type);
7367 return build_cplus_array_type (type, itype);
7370 /* Check that it's OK to declare a function with the indicated TYPE.
7371 SFK indicates the kind of special function (if any) that this
7372 function is. OPTYPE is the type given in a conversion operator
7373 declaration, or the class type for a constructor/destructor.
7374 Returns the actual return type of the function; that
7375 may be different than TYPE if an error occurs, or for certain
7376 special functions. */
7379 check_special_function_return_type (special_function_kind sfk,
7385 case sfk_constructor:
7387 error ("return type specification for constructor invalid");
7389 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7390 type = build_pointer_type (optype);
7392 type = void_type_node;
7395 case sfk_destructor:
7397 error ("return type specification for destructor invalid");
7398 /* We can't use the proper return type here because we run into
7399 problems with ambiguous bases and covariant returns.
7400 Java classes are left unchanged because (void *) isn't a valid
7401 Java type, and we don't want to change the Java ABI. */
7402 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7403 type = build_pointer_type (void_type_node);
7405 type = void_type_node;
7408 case sfk_conversion:
7410 error ("return type specified for %<operator %T%>", optype);
7421 /* A variable or data member (whose unqualified name is IDENTIFIER)
7422 has been declared with the indicated TYPE. If the TYPE is not
7423 acceptable, issue an error message and return a type to use for
7424 error-recovery purposes. */
7427 check_var_type (tree identifier, tree type)
7429 if (VOID_TYPE_P (type))
7432 error ("unnamed variable or field declared void");
7433 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7435 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7436 error ("variable or field %qE declared void", identifier);
7439 error ("variable or field declared void");
7440 type = error_mark_node;
7446 /* Given declspecs and a declarator (abstract or otherwise), determine
7447 the name and type of the object declared and construct a DECL node
7450 DECLSPECS points to the representation of declaration-specifier
7451 sequence that precedes declarator.
7453 DECL_CONTEXT says which syntactic context this declaration is in:
7454 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7455 FUNCDEF for a function definition. Like NORMAL but a few different
7456 error messages in each case. Return value may be zero meaning
7457 this definition is too screwy to try to parse.
7458 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7459 handle member functions (which have FIELD context).
7460 Return value may be zero meaning this definition is too screwy to
7462 PARM for a parameter declaration (either within a function prototype
7463 or before a function body). Make a PARM_DECL, or return void_type_node.
7464 CATCHPARM for a parameter declaration before a catch clause.
7465 TYPENAME if for a typename (in a cast or sizeof).
7466 Don't make a DECL node; just return the ..._TYPE node.
7467 FIELD for a struct or union field; make a FIELD_DECL.
7468 BITFIELD for a field with specified width.
7469 INITIALIZED is as for start_decl.
7471 ATTRLIST is a pointer to the list of attributes, which may be NULL
7472 if there are none; *ATTRLIST may be modified if attributes from inside
7473 the declarator should be applied to the declaration.
7475 When this function is called, scoping variables (such as
7476 CURRENT_CLASS_TYPE) should reflect the scope in which the
7477 declaration occurs, not the scope in which the new declaration will
7478 be placed. For example, on:
7482 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7485 Returns a DECL (if a declarator is present), a TYPE (if there is no
7486 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7490 grokdeclarator (const cp_declarator *declarator,
7491 const cp_decl_specifier_seq *declspecs,
7492 enum decl_context decl_context,
7496 tree type = NULL_TREE;
7498 int virtualp, explicitp, friendp, inlinep, staticp;
7499 int explicit_int = 0;
7500 int explicit_char = 0;
7501 int defaulted_int = 0;
7502 tree dependent_name = NULL_TREE;
7504 tree typedef_decl = NULL_TREE;
7505 const char *name = NULL;
7506 tree typedef_type = NULL_TREE;
7507 /* True if this declarator is a function definition. */
7508 bool funcdef_flag = false;
7509 cp_declarator_kind innermost_code = cdk_error;
7512 /* See the code below that used this. */
7513 tree decl_attr = NULL_TREE;
7516 /* Keep track of what sort of function is being processed
7517 so that we can warn about default return values, or explicit
7518 return values which do not match prescribed defaults. */
7519 special_function_kind sfk = sfk_none;
7521 tree dname = NULL_TREE;
7522 tree ctor_return_type = NULL_TREE;
7523 enum overload_flags flags = NO_SPECIAL;
7524 /* cv-qualifiers that apply to the declarator, for a declaration of
7525 a member function. */
7526 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7527 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7529 tree raises = NULL_TREE;
7530 int template_count = 0;
7531 tree returned_attrs = NULL_TREE;
7532 tree parms = NULL_TREE;
7533 const cp_declarator *id_declarator;
7534 /* The unqualified name of the declarator; either an
7535 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7536 tree unqualified_id;
7537 /* The class type, if any, in which this entity is located,
7538 or NULL_TREE if none. Note that this value may be different from
7539 the current class type; for example if an attempt is made to declare
7540 "A::f" inside "B", this value will be "A". */
7541 tree ctype = current_class_type;
7542 /* The NAMESPACE_DECL for the namespace in which this entity is
7543 located. If an unqualified name is used to declare the entity,
7544 this value will be NULL_TREE, even if the entity is located at
7546 tree in_namespace = NULL_TREE;
7547 cp_storage_class storage_class;
7548 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7549 bool type_was_error_mark_node = false;
7550 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7551 bool set_no_warning = false;
7553 signed_p = declspecs->specs[(int)ds_signed];
7554 unsigned_p = declspecs->specs[(int)ds_unsigned];
7555 short_p = declspecs->specs[(int)ds_short];
7556 long_p = declspecs->specs[(int)ds_long];
7557 longlong = declspecs->specs[(int)ds_long] >= 2;
7558 thread_p = declspecs->specs[(int)ds_thread];
7560 if (decl_context == FUNCDEF)
7561 funcdef_flag = true, decl_context = NORMAL;
7562 else if (decl_context == MEMFUNCDEF)
7563 funcdef_flag = true, decl_context = FIELD;
7564 else if (decl_context == BITFIELD)
7565 bitfield = 1, decl_context = FIELD;
7567 if (initialized > 1)
7568 funcdef_flag = true;
7570 /* Look inside a declarator for the name being declared
7571 and get it as a string, for an error message. */
7572 for (id_declarator = declarator;
7574 id_declarator = id_declarator->declarator)
7576 if (id_declarator->kind != cdk_id)
7577 innermost_code = id_declarator->kind;
7579 switch (id_declarator->kind)
7582 if (id_declarator->declarator
7583 && id_declarator->declarator->kind == cdk_id)
7585 sfk = id_declarator->declarator->u.id.sfk;
7586 if (sfk == sfk_destructor)
7593 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7594 tree decl = id_declarator->u.id.unqualified_name;
7597 if (qualifying_scope)
7599 if (at_function_scope_p ())
7603 A declarator-id shall not be qualified except
7606 None of the cases are permitted in block
7608 if (qualifying_scope == global_namespace)
7609 error ("invalid use of qualified-name %<::%D%>",
7611 else if (TYPE_P (qualifying_scope))
7612 error ("invalid use of qualified-name %<%T::%D%>",
7613 qualifying_scope, decl);
7615 error ("invalid use of qualified-name %<%D::%D%>",
7616 qualifying_scope, decl);
7617 return error_mark_node;
7619 else if (TYPE_P (qualifying_scope))
7621 ctype = qualifying_scope;
7622 if (innermost_code != cdk_function
7623 && current_class_type
7624 && !UNIQUELY_DERIVED_FROM_P (ctype,
7625 current_class_type))
7627 error ("type %qT is not derived from type %qT",
7628 ctype, current_class_type);
7629 return error_mark_node;
7632 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7633 in_namespace = qualifying_scope;
7635 switch (TREE_CODE (decl))
7641 if (innermost_code != cdk_function)
7643 error ("declaration of %qD as non-function", decl);
7644 return error_mark_node;
7646 else if (!qualifying_scope
7647 && !(current_class_type && at_class_scope_p ()))
7649 error ("declaration of %qD as non-member", decl);
7650 return error_mark_node;
7653 type = TREE_OPERAND (decl, 0);
7654 name = IDENTIFIER_POINTER (constructor_name (type));
7659 case TEMPLATE_ID_EXPR:
7661 tree fns = TREE_OPERAND (decl, 0);
7664 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7666 gcc_assert (is_overloaded_fn (dname));
7667 dname = DECL_NAME (get_first_fn (dname));
7672 case IDENTIFIER_NODE:
7673 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7676 if (C_IS_RESERVED_WORD (dname))
7678 error ("declarator-id missing; using reserved word %qD",
7680 name = IDENTIFIER_POINTER (dname);
7682 else if (!IDENTIFIER_TYPENAME_P (dname))
7683 name = IDENTIFIER_POINTER (dname);
7686 gcc_assert (flags == NO_SPECIAL);
7687 flags = TYPENAME_FLAG;
7688 ctor_return_type = TREE_TYPE (dname);
7689 sfk = sfk_conversion;
7690 if (is_typename_at_global_scope (dname))
7691 name = IDENTIFIER_POINTER (dname);
7693 name = "<invalid operator>";
7710 return error_mark_node;
7715 if (id_declarator->kind == cdk_id)
7721 The declarator in a function-definition shall have the form
7722 D1 ( parameter-declaration-clause) ... */
7723 if (funcdef_flag && innermost_code != cdk_function)
7725 error ("function definition does not declare parameters");
7726 return error_mark_node;
7729 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7730 && innermost_code != cdk_function
7731 && ! (ctype && !declspecs->any_specifiers_p))
7733 error ("declaration of %qD as non-function", dname);
7734 return error_mark_node;
7737 /* Anything declared one level down from the top level
7738 must be one of the parameters of a function
7739 (because the body is at least two levels down). */
7741 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7742 by not allowing C++ class definitions to specify their parameters
7743 with xdecls (must be spec.d in the parmlist).
7745 Since we now wait to push a class scope until we are sure that
7746 we are in a legitimate method context, we must set oldcname
7747 explicitly (since current_class_name is not yet alive).
7749 We also want to avoid calling this a PARM if it is in a namespace. */
7751 if (decl_context == NORMAL && !toplevel_bindings_p ())
7753 struct cp_binding_level *b = current_binding_level;
7754 current_binding_level = b->level_chain;
7755 if (current_binding_level != 0 && toplevel_bindings_p ())
7756 decl_context = PARM;
7757 current_binding_level = b;
7761 name = decl_context == PARM ? "parameter" : "type name";
7763 /* If there were multiple types specified in the decl-specifier-seq,
7764 issue an error message. */
7765 if (declspecs->multiple_types_p)
7767 error ("two or more data types in declaration of %qs", name);
7768 return error_mark_node;
7771 if (declspecs->conflicting_specifiers_p)
7773 error ("conflicting specifiers in declaration of %qs", name);
7774 return error_mark_node;
7777 /* Extract the basic type from the decl-specifier-seq. */
7778 type = declspecs->type;
7779 if (type == error_mark_node)
7782 type_was_error_mark_node = true;
7784 /* If the entire declaration is itself tagged as deprecated then
7785 suppress reports of deprecated items. */
7786 if (type && TREE_DEPRECATED (type)
7787 && deprecated_state != DEPRECATED_SUPPRESS)
7788 warn_deprecated_use (type);
7789 if (type && TREE_CODE (type) == TYPE_DECL)
7791 typedef_decl = type;
7792 type = TREE_TYPE (typedef_decl);
7793 if (TREE_DEPRECATED (type)
7794 && DECL_ARTIFICIAL (typedef_decl)
7795 && deprecated_state != DEPRECATED_SUPPRESS)
7796 warn_deprecated_use (type);
7798 /* No type at all: default to `int', and set DEFAULTED_INT
7799 because it was not a user-defined typedef. */
7800 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7802 /* These imply 'int'. */
7803 type = integer_type_node;
7807 explicit_int = declspecs->explicit_int_p;
7808 explicit_char = declspecs->explicit_char_p;
7811 /* See the code below that used this. */
7813 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7815 typedef_type = type;
7818 if (sfk != sfk_conversion)
7819 ctor_return_type = ctype;
7821 if (sfk != sfk_none)
7822 type = check_special_function_return_type (sfk, type,
7824 else if (type == NULL_TREE)
7830 /* We handle `main' specially here, because 'main () { }' is so
7831 common. With no options, it is allowed. With -Wreturn-type,
7832 it is a warning. It is only an error with -pedantic-errors. */
7833 is_main = (funcdef_flag
7834 && dname && MAIN_NAME_P (dname)
7835 && ctype == NULL_TREE
7836 && in_namespace == NULL_TREE
7837 && current_namespace == global_namespace);
7839 if (type_was_error_mark_node)
7840 /* We've already issued an error, don't complain more. */;
7841 else if (in_system_header || flag_ms_extensions)
7842 /* Allow it, sigh. */;
7844 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7846 pedwarn (input_location, OPT_pedantic,
7847 "ISO C++ forbids declaration of %qs with no type", name);
7849 warning (OPT_Wreturn_type,
7850 "ISO C++ forbids declaration of %qs with no type", name);
7852 type = integer_type_node;
7857 /* Now process the modifiers that were specified
7858 and check for invalid combinations. */
7860 /* Long double is a special combination. */
7861 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7864 type = build_qualified_type (long_double_type_node,
7865 cp_type_quals (type));
7868 /* Check all other uses of type modifiers. */
7870 if (unsigned_p || signed_p || long_p || short_p)
7874 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7875 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7876 else if (signed_p && unsigned_p)
7877 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7878 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7879 error ("%<long long%> invalid for %qs", name);
7880 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7881 error ("%<long%> invalid for %qs", name);
7882 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7883 error ("%<short%> invalid for %qs", name);
7884 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7885 error ("%<long%> or %<short%> invalid for %qs", name);
7886 else if ((long_p || short_p) && explicit_char)
7887 error ("%<long%> or %<short%> specified with char for %qs", name);
7888 else if (long_p && short_p)
7889 error ("%<long%> and %<short%> specified together for %qs", name);
7890 else if (type == char16_type_node || type == char32_type_node)
7892 if (signed_p || unsigned_p)
7893 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7894 else if (short_p || long_p)
7895 error ("%<short%> or %<long%> invalid for %qs", name);
7900 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7902 pedwarn (input_location, OPT_pedantic,
7903 "long, short, signed or unsigned used invalidly for %qs",
7905 if (flag_pedantic_errors)
7910 /* Discard the type modifiers if they are invalid. */
7921 /* Decide whether an integer type is signed or not.
7922 Optionally treat bitfields as signed by default. */
7926 It is implementation-defined whether a plain (neither
7927 explicitly signed or unsigned) char, short, int, or long
7928 bit-field is signed or unsigned.
7930 Naturally, we extend this to long long as well. Note that
7931 this does not include wchar_t. */
7932 || (bitfield && !flag_signed_bitfields
7934 /* A typedef for plain `int' without `signed' can be
7935 controlled just like plain `int', but a typedef for
7936 `signed int' cannot be so controlled. */
7938 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7939 && TREE_CODE (type) == INTEGER_TYPE
7940 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7943 type = long_long_unsigned_type_node;
7945 type = long_unsigned_type_node;
7947 type = short_unsigned_type_node;
7948 else if (type == char_type_node)
7949 type = unsigned_char_type_node;
7950 else if (typedef_decl)
7951 type = unsigned_type_for (type);
7953 type = unsigned_type_node;
7955 else if (signed_p && type == char_type_node)
7956 type = signed_char_type_node;
7958 type = long_long_integer_type_node;
7960 type = long_integer_type_node;
7962 type = short_integer_type_node;
7964 if (declspecs->specs[(int)ds_complex])
7966 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7967 error ("complex invalid for %qs", name);
7968 /* If we just have "complex", it is equivalent to
7969 "complex double", but if any modifiers at all are specified it is
7970 the complex form of TYPE. E.g, "complex short" is
7971 "complex short int". */
7973 else if (defaulted_int && ! longlong
7974 && ! (long_p || short_p || signed_p || unsigned_p))
7975 type = complex_double_type_node;
7976 else if (type == integer_type_node)
7977 type = complex_integer_type_node;
7978 else if (type == float_type_node)
7979 type = complex_float_type_node;
7980 else if (type == double_type_node)
7981 type = complex_double_type_node;
7982 else if (type == long_double_type_node)
7983 type = complex_long_double_type_node;
7985 type = build_complex_type (type);
7988 type_quals = TYPE_UNQUALIFIED;
7989 if (declspecs->specs[(int)ds_const])
7990 type_quals |= TYPE_QUAL_CONST;
7991 if (declspecs->specs[(int)ds_volatile])
7992 type_quals |= TYPE_QUAL_VOLATILE;
7993 if (declspecs->specs[(int)ds_restrict])
7994 type_quals |= TYPE_QUAL_RESTRICT;
7995 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7996 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7999 if (TREE_CODE (type) == FUNCTION_TYPE
8000 && type_quals != TYPE_UNQUALIFIED)
8002 /* This was an error in C++98 (cv-qualifiers cannot be added to
8003 a function type), but DR 295 makes the code well-formed by
8004 dropping the extra qualifiers. */
8007 tree bad_type = build_qualified_type (type, type_quals);
8008 pedwarn (input_location, OPT_pedantic,
8009 "ignoring %qV qualifiers added to function type %qT",
8012 type_quals = TYPE_UNQUALIFIED;
8014 type_quals |= cp_type_quals (type);
8015 type = cp_build_qualified_type_real
8016 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8017 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8018 /* We might have ignored or rejected some of the qualifiers. */
8019 type_quals = cp_type_quals (type);
8022 inlinep = !! declspecs->specs[(int)ds_inline];
8023 virtualp = !! declspecs->specs[(int)ds_virtual];
8024 explicitp = !! declspecs->specs[(int)ds_explicit];
8026 storage_class = declspecs->storage_class;
8027 if (storage_class == sc_static)
8028 staticp = 1 + (decl_context == FIELD);
8030 if (virtualp && staticp == 2)
8032 error ("member %qD cannot be declared both virtual and static", dname);
8033 storage_class = sc_none;
8036 friendp = !! declspecs->specs[(int)ds_friend];
8038 if (dependent_name && !friendp)
8040 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8041 return error_mark_node;
8044 /* Issue errors about use of storage classes for parameters. */
8045 if (decl_context == PARM)
8047 if (declspecs->specs[(int)ds_typedef])
8049 error ("typedef declaration invalid in parameter declaration");
8050 return error_mark_node;
8052 else if (storage_class == sc_static
8053 || storage_class == sc_extern
8055 error ("storage class specifiers invalid in parameter declarations");
8058 /* Give error if `virtual' is used outside of class declaration. */
8060 && (current_class_name == NULL_TREE || decl_context != FIELD))
8062 error ("%<virtual%> outside class declaration");
8066 /* Static anonymous unions are dealt with here. */
8067 if (staticp && decl_context == TYPENAME
8069 && ANON_AGGR_TYPE_P (declspecs->type))
8070 decl_context = FIELD;
8072 /* Warn about storage classes that are invalid for certain
8073 kinds of declarations (parameters, typenames, etc.). */
8076 && storage_class != sc_extern
8077 && storage_class != sc_static)
8078 || declspecs->specs[(int)ds_typedef]))
8080 error ("multiple storage classes in declaration of %qs", name);
8083 if (decl_context != NORMAL
8084 && ((storage_class != sc_none
8085 && storage_class != sc_mutable)
8088 if ((decl_context == PARM || decl_context == CATCHPARM)
8089 && (storage_class == sc_register
8090 || storage_class == sc_auto))
8092 else if (declspecs->specs[(int)ds_typedef])
8094 else if (decl_context == FIELD
8095 /* C++ allows static class elements. */
8096 && storage_class == sc_static)
8097 /* C++ also allows inlines and signed and unsigned elements,
8098 but in those cases we don't come in here. */
8102 if (decl_context == FIELD)
8103 error ("storage class specified for %qs", name);
8106 if (decl_context == PARM || decl_context == CATCHPARM)
8107 error ("storage class specified for parameter %qs", name);
8109 error ("storage class specified for typename");
8111 if (storage_class == sc_register
8112 || storage_class == sc_auto
8113 || storage_class == sc_extern
8115 storage_class = sc_none;
8118 else if (storage_class == sc_extern && funcdef_flag
8119 && ! toplevel_bindings_p ())
8120 error ("nested function %qs declared %<extern%>", name);
8121 else if (toplevel_bindings_p ())
8123 if (storage_class == sc_auto)
8124 error ("top-level declaration of %qs specifies %<auto%>", name);
8127 && storage_class != sc_extern
8128 && storage_class != sc_static)
8130 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8135 if (storage_class && friendp)
8137 error ("storage class specifiers invalid in friend function declarations");
8138 storage_class = sc_none;
8143 unqualified_id = NULL_TREE;
8146 unqualified_id = id_declarator->u.id.unqualified_name;
8147 switch (TREE_CODE (unqualified_id))
8151 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8154 case IDENTIFIER_NODE:
8155 case TEMPLATE_ID_EXPR:
8163 /* Determine the type of the entity declared by recurring on the
8165 for (; declarator; declarator = declarator->declarator)
8167 const cp_declarator *inner_declarator;
8170 if (type == error_mark_node)
8171 return error_mark_node;
8173 attrs = declarator->attributes;
8179 if (declarator == NULL || declarator->kind == cdk_id)
8180 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8181 if (declarator->kind == cdk_function)
8182 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8183 if (declarator->kind == cdk_array)
8184 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8185 returned_attrs = decl_attributes (&type,
8186 chainon (returned_attrs, attrs),
8190 if (declarator->kind == cdk_id)
8193 inner_declarator = declarator->declarator;
8195 switch (declarator->kind)
8198 type = create_array_type_for_decl (dname, type,
8199 declarator->u.array.bounds);
8207 /* Declaring a function type.
8208 Make sure we have a valid type for the function to return. */
8210 if (type_quals != TYPE_UNQUALIFIED)
8212 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8213 warning (OPT_Wignored_qualifiers,
8214 "type qualifiers ignored on function return type");
8215 /* We now know that the TYPE_QUALS don't apply to the
8216 decl, but to its return type. */
8217 type_quals = TYPE_UNQUALIFIED;
8218 set_no_warning = true;
8221 /* Error about some types functions can't return. */
8223 if (TREE_CODE (type) == FUNCTION_TYPE)
8225 error ("%qs declared as function returning a function", name);
8226 return error_mark_node;
8228 if (TREE_CODE (type) == ARRAY_TYPE)
8230 error ("%qs declared as function returning an array", name);
8231 return error_mark_node;
8234 /* Pick up type qualifiers which should be applied to `this'. */
8235 memfn_quals = declarator->u.function.qualifiers;
8237 /* Pick up the exception specifications. */
8238 raises = declarator->u.function.exception_specification;
8240 /* Say it's a definition only for the CALL_EXPR
8241 closest to the identifier. */
8242 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8244 /* Handle a late-specified return type. */
8247 if (type_uses_auto (type))
8249 if (!declarator->u.function.late_return_type)
8251 error ("%qs function uses auto type specifier without"
8252 " late return type", name);
8253 return error_mark_node;
8255 else if (!is_auto (type))
8257 error ("%qs function with late return type not using"
8258 " auto type specifier as its type", name);
8259 return error_mark_node;
8262 else if (declarator->u.function.late_return_type)
8264 error ("%qs function with late return type not declared"
8265 " with auto type specifier", name);
8266 return error_mark_node;
8269 type = splice_late_return_type
8270 (type, declarator->u.function.late_return_type);
8271 if (type == error_mark_node)
8272 return error_mark_node;
8274 if (ctype == NULL_TREE
8275 && decl_context == FIELD
8277 && (friendp == 0 || dname == current_class_name))
8278 ctype = current_class_type;
8280 if (ctype && (sfk == sfk_constructor
8281 || sfk == sfk_destructor))
8283 /* We are within a class's scope. If our declarator name
8284 is the same as the class name, and we are defining
8285 a function, then it is a constructor/destructor, and
8286 therefore returns a void type. */
8288 /* ISO C++ 12.4/2. A destructor may not be declared
8289 const or volatile. A destructor may not be
8292 ISO C++ 12.1. A constructor may not be declared
8293 const or volatile. A constructor may not be
8294 virtual. A constructor may not be static. */
8296 error ((flags == DTOR_FLAG)
8297 ? "destructor cannot be static member function"
8298 : "constructor cannot be static member function");
8301 error ((flags == DTOR_FLAG)
8302 ? "destructors may not be cv-qualified"
8303 : "constructors may not be cv-qualified");
8304 memfn_quals = TYPE_UNQUALIFIED;
8307 if (decl_context == FIELD
8308 && !member_function_or_else (ctype,
8311 return error_mark_node;
8313 if (flags != DTOR_FLAG)
8315 /* It's a constructor. */
8320 permerror (input_location, "constructors cannot be declared virtual");
8323 if (decl_context == FIELD
8324 && sfk != sfk_constructor)
8325 return error_mark_node;
8327 if (decl_context == FIELD)
8333 error ("can't initialize friend function %qs", name);
8336 /* Cannot be both friend and virtual. */
8337 error ("virtual functions cannot be friends");
8340 if (decl_context == NORMAL)
8341 error ("friend declaration not in class definition");
8342 if (current_function_decl && funcdef_flag)
8343 error ("can't define friend function %qs in a local "
8348 arg_types = grokparms (declarator->u.function.parameters,
8351 if (inner_declarator
8352 && inner_declarator->kind == cdk_id
8353 && inner_declarator->u.id.sfk == sfk_destructor
8354 && arg_types != void_list_node)
8356 error ("destructors may not have parameters");
8357 arg_types = void_list_node;
8361 type = build_function_type (type, arg_types);
8368 /* Filter out pointers-to-references and references-to-references.
8369 We can get these if a TYPE_DECL is used. */
8371 if (TREE_CODE (type) == REFERENCE_TYPE)
8373 if (declarator->kind != cdk_reference)
8375 error ("cannot declare pointer to %q#T", type);
8376 type = TREE_TYPE (type);
8379 /* In C++0x, we allow reference to reference declarations
8380 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8381 and template type arguments [14.3.1/4 temp.arg.type]. The
8382 check for direct reference to reference declarations, which
8383 are still forbidden, occurs below. Reasoning behind the change
8384 can be found in DR106, DR540, and the rvalue reference
8386 else if (cxx_dialect == cxx98)
8388 error ("cannot declare reference to %q#T", type);
8389 type = TREE_TYPE (type);
8392 else if (VOID_TYPE_P (type))
8394 if (declarator->kind == cdk_reference)
8395 error ("cannot declare reference to %q#T", type);
8396 else if (declarator->kind == cdk_ptrmem)
8397 error ("cannot declare pointer to %q#T member", type);
8400 /* We now know that the TYPE_QUALS don't apply to the decl,
8401 but to the target of the pointer. */
8402 type_quals = TYPE_UNQUALIFIED;
8404 if (declarator->kind == cdk_ptrmem
8405 && (TREE_CODE (type) == FUNCTION_TYPE
8406 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8408 memfn_quals |= cp_type_quals (type);
8409 type = build_memfn_type (type,
8410 declarator->u.pointer.class_type,
8412 memfn_quals = TYPE_UNQUALIFIED;
8415 if (declarator->kind == cdk_reference)
8417 /* In C++0x, the type we are creating a reference to might be
8418 a typedef which is itself a reference type. In that case,
8419 we follow the reference collapsing rules in
8420 [7.1.3/8 dcl.typedef] to create the final reference type:
8422 "If a typedef TD names a type that is a reference to a type
8423 T, an attempt to create the type 'lvalue reference to cv TD'
8424 creates the type 'lvalue reference to T,' while an attempt
8425 to create the type "rvalue reference to cv TD' creates the
8428 if (!VOID_TYPE_P (type))
8429 type = cp_build_reference_type
8430 ((TREE_CODE (type) == REFERENCE_TYPE
8431 ? TREE_TYPE (type) : type),
8432 (declarator->u.reference.rvalue_ref
8433 && (TREE_CODE(type) != REFERENCE_TYPE
8434 || TYPE_REF_IS_RVALUE (type))));
8436 /* In C++0x, we need this check for direct reference to
8437 reference declarations, which are forbidden by
8438 [8.3.2/5 dcl.ref]. Reference to reference declarations
8439 are only allowed indirectly through typedefs and template
8440 type arguments. Example:
8442 void foo(int & &); // invalid ref-to-ref decl
8444 typedef int & int_ref;
8445 void foo(int_ref &); // valid ref-to-ref decl
8447 if (inner_declarator && inner_declarator->kind == cdk_reference)
8448 error ("cannot declare reference to %q#T, which is not "
8449 "a typedef or a template type argument", type);
8451 else if (TREE_CODE (type) == METHOD_TYPE)
8452 type = build_ptrmemfunc_type (build_pointer_type (type));
8453 else if (declarator->kind == cdk_ptrmem)
8455 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8457 if (declarator->u.pointer.class_type == error_mark_node)
8458 /* We will already have complained. */
8459 type = error_mark_node;
8461 type = build_ptrmem_type (declarator->u.pointer.class_type,
8465 type = build_pointer_type (type);
8467 /* Process a list of type modifier keywords (such as
8468 const or volatile) that were given inside the `*' or `&'. */
8470 if (declarator->u.pointer.qualifiers)
8473 = cp_build_qualified_type (type,
8474 declarator->u.pointer.qualifiers);
8475 type_quals = cp_type_quals (type);
8488 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8489 && TREE_CODE (type) != FUNCTION_TYPE
8490 && TREE_CODE (type) != METHOD_TYPE)
8492 error ("template-id %qD used as a declarator",
8494 unqualified_id = dname;
8497 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8498 qualified with a class-name, turn it into a METHOD_TYPE, unless
8499 we know that the function is static. We take advantage of this
8500 opportunity to do other processing that pertains to entities
8501 explicitly declared to be class members. Note that if DECLARATOR
8502 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8503 would not have exited the loop above. */
8505 && declarator->u.id.qualifying_scope
8506 && TYPE_P (declarator->u.id.qualifying_scope))
8510 ctype = declarator->u.id.qualifying_scope;
8511 ctype = TYPE_MAIN_VARIANT (ctype);
8513 while (t != NULL_TREE && CLASS_TYPE_P (t))
8515 /* You're supposed to have one `template <...>' for every
8516 template class, but you don't need one for a full
8517 specialization. For example:
8519 template <class T> struct S{};
8520 template <> struct S<int> { void f(); };
8521 void S<int>::f () {}
8523 is correct; there shouldn't be a `template <>' for the
8524 definition of `S<int>::f'. */
8525 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8526 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8527 /* T is an explicit (not partial) specialization. All
8528 containing classes must therefore also be explicitly
8531 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8532 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8533 template_count += 1;
8535 t = TYPE_MAIN_DECL (t);
8536 t = DECL_CONTEXT (t);
8539 if (ctype == current_class_type)
8543 permerror (input_location, "member functions are implicitly friends of their class");
8547 permerror (declarator->id_loc,
8548 "extra qualification %<%T::%> on member %qs",
8551 else if (/* If the qualifying type is already complete, then we
8552 can skip the following checks. */
8553 !COMPLETE_TYPE_P (ctype)
8554 && (/* If the function is being defined, then
8555 qualifying type must certainly be complete. */
8557 /* A friend declaration of "T::f" is OK, even if
8558 "T" is a template parameter. But, if this
8559 function is not a friend, the qualifying type
8561 || (!friendp && !CLASS_TYPE_P (ctype))
8562 /* For a declaration, the type need not be
8563 complete, if either it is dependent (since there
8564 is no meaningful definition of complete in that
8565 case) or the qualifying class is currently being
8567 || !(dependent_type_p (ctype)
8568 || currently_open_class (ctype)))
8569 /* Check that the qualifying type is complete. */
8570 && !complete_type_or_else (ctype, NULL_TREE))
8571 return error_mark_node;
8572 else if (TREE_CODE (type) == FUNCTION_TYPE)
8574 tree sname = declarator->u.id.unqualified_name;
8576 if (current_class_type
8577 && (!friendp || funcdef_flag))
8580 ? "cannot define member function %<%T::%s%> within %<%T%>"
8581 : "cannot declare member function %<%T::%s%> within %<%T%>",
8582 ctype, name, current_class_type);
8583 return error_mark_node;
8586 if (TREE_CODE (sname) == IDENTIFIER_NODE
8587 && NEW_DELETE_OPNAME_P (sname))
8588 /* Overloaded operator new and operator delete
8589 are always static functions. */
8592 type = build_memfn_type (type, ctype, memfn_quals);
8594 else if (declspecs->specs[(int)ds_typedef]
8595 && current_class_type)
8597 error ("cannot declare member %<%T::%s%> within %qT",
8598 ctype, name, current_class_type);
8599 return error_mark_node;
8603 /* Now TYPE has the actual type. */
8608 *attrlist = chainon (returned_attrs, *attrlist);
8610 attrlist = &returned_attrs;
8613 /* Handle parameter packs. */
8614 if (parameter_pack_p)
8616 if (decl_context == PARM)
8617 /* Turn the type into a pack expansion.*/
8618 type = make_pack_expansion (type);
8620 error ("non-parameter %qs cannot be a parameter pack", name);
8623 /* Did array size calculations overflow? */
8625 if (TREE_CODE (type) == ARRAY_TYPE
8626 && COMPLETE_TYPE_P (type)
8627 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8628 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8630 error ("size of array %qs is too large", name);
8631 /* If we proceed with the array type as it is, we'll eventually
8632 crash in tree_low_cst(). */
8633 type = error_mark_node;
8636 if ((decl_context == FIELD || decl_context == PARM)
8637 && !processing_template_decl
8638 && variably_modified_type_p (type, NULL_TREE))
8640 if (decl_context == FIELD)
8641 error ("data member may not have variably modified type %qT", type);
8643 error ("parameter may not have variably modified type %qT", type);
8644 type = error_mark_node;
8647 if (explicitp == 1 || (explicitp && friendp))
8649 /* [dcl.fct.spec] The explicit specifier shall only be used in
8650 declarations of constructors within a class definition. */
8651 error ("only declarations of constructors can be %<explicit%>");
8655 if (storage_class == sc_mutable)
8657 if (decl_context != FIELD || friendp)
8659 error ("non-member %qs cannot be declared %<mutable%>", name);
8660 storage_class = sc_none;
8662 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8664 error ("non-object member %qs cannot be declared %<mutable%>", name);
8665 storage_class = sc_none;
8667 else if (TREE_CODE (type) == FUNCTION_TYPE
8668 || TREE_CODE (type) == METHOD_TYPE)
8670 error ("function %qs cannot be declared %<mutable%>", name);
8671 storage_class = sc_none;
8675 error ("static %qs cannot be declared %<mutable%>", name);
8676 storage_class = sc_none;
8678 else if (type_quals & TYPE_QUAL_CONST)
8680 error ("const %qs cannot be declared %<mutable%>", name);
8681 storage_class = sc_none;
8685 /* If this is declaring a typedef name, return a TYPE_DECL. */
8686 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8690 /* Note that the grammar rejects storage classes
8691 in typenames, fields or parameters. */
8692 if (current_lang_name == lang_name_java)
8693 TYPE_FOR_JAVA (type) = 1;
8695 /* This declaration:
8697 typedef void f(int) const;
8699 declares a function type which is not a member of any
8700 particular class, but which is cv-qualified; for
8701 example "f S::*" declares a pointer to a const-qualified
8702 member function of S. We record the cv-qualification in the
8704 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8706 type = cp_build_qualified_type (type, memfn_quals);
8708 /* We have now dealt with these qualifiers. */
8709 memfn_quals = TYPE_UNQUALIFIED;
8712 if (decl_context == FIELD)
8713 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8715 decl = build_decl (TYPE_DECL, unqualified_id, type);
8716 if (id_declarator && declarator->u.id.qualifying_scope) {
8717 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8718 TREE_TYPE (decl) = error_mark_node;
8721 if (decl_context != FIELD)
8723 if (!current_function_decl)
8724 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8725 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8726 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8727 (current_function_decl)))
8728 /* The TYPE_DECL is "abstract" because there will be
8729 clones of this constructor/destructor, and there will
8730 be copies of this TYPE_DECL generated in those
8732 DECL_ABSTRACT (decl) = 1;
8734 else if (constructor_name_p (unqualified_id, current_class_type))
8735 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8736 "as enclosing class",
8739 /* If the user declares "typedef struct {...} foo" then the
8740 struct will have an anonymous name. Fill that name in now.
8741 Nothing can refer to it, so nothing needs know about the name
8743 if (type != error_mark_node
8746 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8747 && TYPE_ANONYMOUS_P (type)
8748 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8750 tree oldname = TYPE_NAME (type);
8753 /* Replace the anonymous name with the real name everywhere. */
8754 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8755 if (TYPE_NAME (t) == oldname)
8756 TYPE_NAME (t) = decl;
8758 if (TYPE_LANG_SPECIFIC (type))
8759 TYPE_WAS_ANONYMOUS (type) = 1;
8761 /* If this is a typedef within a template class, the nested
8762 type is a (non-primary) template. The name for the
8763 template needs updating as well. */
8764 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8765 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8766 = TYPE_IDENTIFIER (type);
8768 /* FIXME remangle member functions; member functions of a
8769 type with external linkage have external linkage. */
8773 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8774 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8776 bad_specifiers (decl, "type", virtualp,
8777 memfn_quals != TYPE_UNQUALIFIED,
8778 inlinep, friendp, raises != NULL_TREE);
8783 /* Detect the case of an array type of unspecified size
8784 which came, as such, direct from a typedef name.
8785 We must copy the type, so that the array's domain can be
8786 individually set by the object's initializer. */
8788 if (type && typedef_type
8789 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8790 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8791 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8793 /* Detect where we're using a typedef of function type to declare a
8794 function. PARMS will not be set, so we must create it now. */
8796 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8798 tree decls = NULL_TREE;
8801 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8803 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8805 TREE_CHAIN (decl) = decls;
8809 parms = nreverse (decls);
8811 if (decl_context != TYPENAME)
8813 /* A cv-qualifier-seq shall only be part of the function type
8814 for a non-static member function. [8.3.5/4 dcl.fct] */
8815 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8816 && (current_class_type == NULL_TREE || staticp) )
8819 ? G_("qualified function types cannot be used to "
8820 "declare static member functions")
8821 : G_("qualified function types cannot be used to "
8822 "declare free functions"));
8823 type = TYPE_MAIN_VARIANT (type);
8826 /* The qualifiers on the function type become the qualifiers on
8827 the non-static member function. */
8828 memfn_quals |= cp_type_quals (type);
8832 /* If this is a type name (such as, in a cast or sizeof),
8833 compute the type and return it now. */
8835 if (decl_context == TYPENAME)
8837 /* Note that the grammar rejects storage classes
8838 in typenames, fields or parameters. */
8839 if (type_quals != TYPE_UNQUALIFIED)
8840 type_quals = TYPE_UNQUALIFIED;
8842 /* Special case: "friend class foo" looks like a TYPENAME context. */
8845 if (type_quals != TYPE_UNQUALIFIED)
8847 error ("type qualifiers specified for friend class declaration");
8848 type_quals = TYPE_UNQUALIFIED;
8852 error ("%<inline%> specified for friend class declaration");
8858 /* Don't allow friend declaration without a class-key. */
8859 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8860 permerror (input_location, "template parameters cannot be friends");
8861 else if (TREE_CODE (type) == TYPENAME_TYPE)
8862 permerror (input_location, "friend declaration requires class-key, "
8863 "i.e. %<friend class %T::%D%>",
8864 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8866 permerror (input_location, "friend declaration requires class-key, "
8867 "i.e. %<friend %#T%>",
8871 /* Only try to do this stuff if we didn't already give up. */
8872 if (type != integer_type_node)
8874 /* A friendly class? */
8875 if (current_class_type)
8876 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8879 error ("trying to make class %qT a friend of global scope",
8882 type = void_type_node;
8885 else if (memfn_quals)
8887 if (ctype == NULL_TREE)
8889 if (TREE_CODE (type) != METHOD_TYPE)
8890 error ("invalid qualifiers on non-member function type");
8892 ctype = TYPE_METHOD_BASETYPE (type);
8895 type = build_memfn_type (type, ctype, memfn_quals);
8900 else if (unqualified_id == NULL_TREE && decl_context != PARM
8901 && decl_context != CATCHPARM
8902 && TREE_CODE (type) != UNION_TYPE
8905 error ("abstract declarator %qT used as declaration", type);
8906 return error_mark_node;
8909 /* Only functions may be declared using an operator-function-id. */
8911 && IDENTIFIER_OPNAME_P (unqualified_id)
8912 && TREE_CODE (type) != FUNCTION_TYPE
8913 && TREE_CODE (type) != METHOD_TYPE)
8915 error ("declaration of %qD as non-function", unqualified_id);
8916 return error_mark_node;
8919 /* We don't check parameter types here because we can emit a better
8920 error message later. */
8921 if (decl_context != PARM)
8923 type = check_var_type (unqualified_id, type);
8924 if (type == error_mark_node)
8925 return error_mark_node;
8928 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8929 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8931 if (decl_context == PARM || decl_context == CATCHPARM)
8933 if (ctype || in_namespace)
8934 error ("cannot use %<::%> in parameter declaration");
8936 /* A parameter declared as an array of T is really a pointer to T.
8937 One declared as a function is really a pointer to a function.
8938 One declared as a member is really a pointer to member. */
8940 if (TREE_CODE (type) == ARRAY_TYPE)
8942 /* Transfer const-ness of array into that of type pointed to. */
8943 type = build_pointer_type (TREE_TYPE (type));
8944 type_quals = TYPE_UNQUALIFIED;
8946 else if (TREE_CODE (type) == FUNCTION_TYPE)
8947 type = build_pointer_type (type);
8953 if (decl_context == PARM)
8955 decl = cp_build_parm_decl (unqualified_id, type);
8957 bad_specifiers (decl, "parameter", virtualp,
8958 memfn_quals != TYPE_UNQUALIFIED,
8959 inlinep, friendp, raises != NULL_TREE);
8961 else if (decl_context == FIELD)
8963 /* The C99 flexible array extension. */
8964 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8965 && TYPE_DOMAIN (type) == NULL_TREE)
8967 tree itype = compute_array_index_type (dname, integer_zero_node);
8968 type = build_cplus_array_type (TREE_TYPE (type), itype);
8971 if (type == error_mark_node)
8973 /* Happens when declaring arrays of sizes which
8974 are error_mark_node, for example. */
8977 else if (in_namespace && !friendp)
8979 /* Something like struct S { int N::j; }; */
8980 error ("invalid use of %<::%>");
8981 return error_mark_node;
8983 else if (TREE_CODE (type) == FUNCTION_TYPE)
8986 tree function_context;
8990 if (ctype == NULL_TREE)
8991 ctype = current_class_type;
8993 if (ctype == NULL_TREE)
8995 error ("can't make %qD into a method -- not in a class",
8997 return error_mark_node;
9000 /* ``A union may [ ... ] not [ have ] virtual functions.''
9002 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9004 error ("function %qD declared virtual inside a union",
9006 return error_mark_node;
9009 if (NEW_DELETE_OPNAME_P (unqualified_id))
9013 error ("%qD cannot be declared virtual, since it "
9019 else if (staticp < 2)
9020 type = build_memfn_type (type, ctype, memfn_quals);
9023 /* Check that the name used for a destructor makes sense. */
9024 if (sfk == sfk_destructor)
9028 gcc_assert (friendp);
9029 error ("expected qualified name in friend declaration "
9030 "for destructor %qD",
9031 id_declarator->u.id.unqualified_name);
9032 return error_mark_node;
9035 if (!same_type_p (TREE_OPERAND
9036 (id_declarator->u.id.unqualified_name, 0),
9039 error ("declaration of %qD as member of %qT",
9040 id_declarator->u.id.unqualified_name, ctype);
9041 return error_mark_node;
9044 else if (sfk == sfk_constructor && friendp)
9046 error ("expected qualified name in friend declaration "
9047 "for constructor %qD",
9048 id_declarator->u.id.unqualified_name);
9049 return error_mark_node;
9052 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9053 function_context = (ctype != NULL_TREE) ?
9054 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9055 publicp = (! friendp || ! staticp)
9056 && function_context == NULL_TREE;
9057 decl = grokfndecl (ctype, type,
9058 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9059 ? unqualified_id : dname,
9062 virtualp, flags, memfn_quals, raises,
9063 friendp ? -1 : 0, friendp, publicp, inlinep,
9065 funcdef_flag, template_count, in_namespace,
9066 attrlist, declarator->id_loc);
9067 if (decl == NULL_TREE)
9068 return error_mark_node;
9070 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9071 /* The decl and setting of decl_attr is also turned off. */
9072 decl = build_decl_attribute_variant (decl, decl_attr);
9075 /* [class.conv.ctor]
9077 A constructor declared without the function-specifier
9078 explicit that can be called with a single parameter
9079 specifies a conversion from the type of its first
9080 parameter to the type of its class. Such a constructor
9081 is called a converting constructor. */
9083 DECL_NONCONVERTING_P (decl) = 1;
9084 else if (DECL_CONSTRUCTOR_P (decl))
9086 /* A constructor with no parms is not a conversion.
9087 Ignore any compiler-added parms. */
9088 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
9090 if (arg_types == void_list_node)
9091 DECL_NONCONVERTING_P (decl) = 1;
9094 else if (TREE_CODE (type) == METHOD_TYPE)
9096 /* We only get here for friend declarations of
9097 members of other classes. */
9098 /* All method decls are public, so tell grokfndecl to set
9099 TREE_PUBLIC, also. */
9100 decl = grokfndecl (ctype, type,
9101 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9102 ? unqualified_id : dname,
9105 virtualp, flags, memfn_quals, raises,
9106 friendp ? -1 : 0, friendp, 1, 0, sfk,
9107 funcdef_flag, template_count, in_namespace,
9109 declarator->id_loc);
9110 if (decl == NULL_TREE)
9111 return error_mark_node;
9113 else if (!staticp && !dependent_type_p (type)
9114 && !COMPLETE_TYPE_P (complete_type (type))
9115 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9118 error ("field %qD has incomplete type", unqualified_id);
9120 error ("name %qT has incomplete type", type);
9122 /* If we're instantiating a template, tell them which
9123 instantiation made the field's type be incomplete. */
9124 if (current_class_type
9125 && TYPE_NAME (current_class_type)
9126 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9128 && declspecs->type == type)
9129 error (" in instantiation of template %qT",
9130 current_class_type);
9132 return error_mark_node;
9138 error ("%qE is neither function nor member function; "
9139 "cannot be declared friend", unqualified_id);
9147 /* Friends are treated specially. */
9148 if (ctype == current_class_type)
9149 ; /* We already issued a permerror. */
9150 else if (decl && DECL_NAME (decl))
9152 if (template_class_depth (current_class_type) == 0)
9154 decl = check_explicit_specialization
9155 (unqualified_id, decl, template_count,
9156 2 * funcdef_flag + 4);
9157 if (decl == error_mark_node)
9158 return error_mark_node;
9161 decl = do_friend (ctype, unqualified_id, decl,
9167 return error_mark_node;
9170 /* Structure field. It may not be a function, except for C++. */
9172 if (decl == NULL_TREE)
9178 /* An attempt is being made to initialize a non-static
9179 member. But, from [class.mem]:
9181 4 A member-declarator can contain a
9182 constant-initializer only if it declares a static
9183 member (_class.static_) of integral or enumeration
9184 type, see _class.static.data_.
9186 This used to be relatively common practice, but
9187 the rest of the compiler does not correctly
9188 handle the initialization unless the member is
9189 static so we make it static below. */
9190 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9192 permerror (input_location, "making %qD static", unqualified_id);
9196 if (uses_template_parms (type))
9197 /* We'll check at instantiation time. */
9199 else if (check_static_variable_definition (unqualified_id,
9201 /* If we just return the declaration, crashes
9202 will sometimes occur. We therefore return
9203 void_type_node, as if this was a friend
9204 declaration, to cause callers to completely
9205 ignore this declaration. */
9206 return error_mark_node;
9211 /* C++ allows static class members. All other work
9212 for this is done by grokfield. */
9213 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9214 set_linkage_for_static_data_member (decl);
9215 /* Even if there is an in-class initialization, DECL
9216 is considered undefined until an out-of-class
9217 definition is provided. */
9218 DECL_EXTERNAL (decl) = 1;
9221 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9225 decl = build_decl (FIELD_DECL, unqualified_id, type);
9226 DECL_NONADDRESSABLE_P (decl) = bitfield;
9227 if (bitfield && !unqualified_id)
9228 TREE_NO_WARNING (decl) = 1;
9230 if (storage_class == sc_mutable)
9232 DECL_MUTABLE_P (decl) = 1;
9233 storage_class = sc_none;
9237 bad_specifiers (decl, "field", virtualp,
9238 memfn_quals != TYPE_UNQUALIFIED,
9239 inlinep, friendp, raises != NULL_TREE);
9242 else if (TREE_CODE (type) == FUNCTION_TYPE
9243 || TREE_CODE (type) == METHOD_TYPE)
9248 if (!unqualified_id)
9249 return error_mark_node;
9251 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9252 original_name = dname;
9254 original_name = unqualified_id;
9256 if (storage_class == sc_auto)
9257 error ("storage class %<auto%> invalid for function %qs", name);
9258 else if (storage_class == sc_register)
9259 error ("storage class %<register%> invalid for function %qs", name);
9261 error ("storage class %<__thread%> invalid for function %qs", name);
9263 /* Function declaration not at top level.
9264 Storage classes other than `extern' are not allowed
9265 and `extern' makes no difference. */
9266 if (! toplevel_bindings_p ()
9267 && (storage_class == sc_static
9268 || declspecs->specs[(int)ds_inline])
9271 if (storage_class == sc_static)
9272 pedwarn (input_location, OPT_pedantic,
9273 "%<static%> specified invalid for function %qs "
9274 "declared out of global scope", name);
9276 pedwarn (input_location, OPT_pedantic,
9277 "%<inline%> specifier invalid for function %qs "
9278 "declared out of global scope", name);
9281 if (ctype == NULL_TREE)
9285 error ("virtual non-class function %qs", name);
9289 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9290 && !NEW_DELETE_OPNAME_P (original_name))
9291 type = build_method_type_directly (ctype,
9293 TYPE_ARG_TYPES (type));
9295 /* Record presence of `static'. */
9296 publicp = (ctype != NULL_TREE
9297 || storage_class == sc_extern
9298 || storage_class != sc_static);
9300 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9301 virtualp, flags, memfn_quals, raises,
9303 publicp, inlinep, sfk, funcdef_flag,
9304 template_count, in_namespace, attrlist,
9305 declarator->id_loc);
9306 if (decl == NULL_TREE)
9307 return error_mark_node;
9311 int invalid_static = 0;
9313 /* Don't allow a static member function in a class, and forbid
9314 declaring main to be static. */
9315 if (TREE_CODE (type) == METHOD_TYPE)
9317 permerror (input_location, "cannot declare member function %qD to have "
9318 "static linkage", decl);
9321 else if (current_function_decl)
9323 /* FIXME need arm citation */
9324 error ("cannot declare static function inside another function");
9331 storage_class = sc_none;
9337 /* It's a variable. */
9339 /* An uninitialized decl with `extern' is a reference. */
9340 decl = grokvardecl (type, unqualified_id,
9343 (type_quals & TYPE_QUAL_CONST) != 0,
9344 ctype ? ctype : in_namespace);
9345 bad_specifiers (decl, "variable", virtualp,
9346 memfn_quals != TYPE_UNQUALIFIED,
9347 inlinep, friendp, raises != NULL_TREE);
9351 DECL_CONTEXT (decl) = ctype;
9354 permerror (input_location, "%<static%> may not be used when defining "
9355 "(as opposed to declaring) a static data member");
9357 storage_class = sc_none;
9359 if (storage_class == sc_register && TREE_STATIC (decl))
9361 error ("static member %qD declared %<register%>", decl);
9362 storage_class = sc_none;
9364 if (storage_class == sc_extern && pedantic)
9366 pedwarn (input_location, OPT_pedantic,
9367 "cannot explicitly declare member %q#D to have "
9368 "extern linkage", decl);
9369 storage_class = sc_none;
9374 if (storage_class == sc_extern && initialized && !funcdef_flag)
9376 if (toplevel_bindings_p ())
9378 /* It's common practice (and completely valid) to have a const
9379 be initialized and declared extern. */
9380 if (!(type_quals & TYPE_QUAL_CONST))
9381 warning (0, "%qs initialized and declared %<extern%>", name);
9385 error ("%qs has both %<extern%> and initializer", name);
9386 return error_mark_node;
9390 /* Record `register' declaration for warnings on &
9391 and in case doing stupid register allocation. */
9393 if (storage_class == sc_register)
9394 DECL_REGISTER (decl) = 1;
9395 else if (storage_class == sc_extern)
9396 DECL_THIS_EXTERN (decl) = 1;
9397 else if (storage_class == sc_static)
9398 DECL_THIS_STATIC (decl) = 1;
9400 /* Record constancy and volatility on the DECL itself . There's
9401 no need to do this when processing a template; we'll do this
9402 for the instantiated declaration based on the type of DECL. */
9403 if (!processing_template_decl)
9404 cp_apply_type_quals_to_decl (type_quals, decl);
9407 TREE_NO_WARNING (decl) = 1;
9413 /* Subroutine of start_function. Ensure that each of the parameter
9414 types (as listed in PARMS) is complete, as is required for a
9415 function definition. */
9418 require_complete_types_for_parms (tree parms)
9420 for (; parms; parms = TREE_CHAIN (parms))
9422 if (dependent_type_p (TREE_TYPE (parms)))
9424 if (!VOID_TYPE_P (TREE_TYPE (parms))
9425 && complete_type_or_else (TREE_TYPE (parms), parms))
9427 relayout_decl (parms);
9428 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9431 /* grokparms or complete_type_or_else will have already issued
9433 TREE_TYPE (parms) = error_mark_node;
9437 /* Returns nonzero if T is a local variable. */
9440 local_variable_p (const_tree t)
9442 if ((TREE_CODE (t) == VAR_DECL
9443 /* A VAR_DECL with a context that is a _TYPE is a static data
9445 && !TYPE_P (CP_DECL_CONTEXT (t))
9446 /* Any other non-local variable must be at namespace scope. */
9447 && !DECL_NAMESPACE_SCOPE_P (t))
9448 || (TREE_CODE (t) == PARM_DECL))
9454 /* Like local_variable_p, but suitable for use as a tree-walking
9458 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9459 void *data ATTRIBUTE_UNUSED)
9461 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9463 else if (TYPE_P (*tp))
9470 /* Check that ARG, which is a default-argument expression for a
9471 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9472 something goes wrong. DECL may also be a _TYPE node, rather than a
9473 DECL, if there is no DECL available. */
9476 check_default_argument (tree decl, tree arg)
9481 if (TREE_CODE (arg) == DEFAULT_ARG)
9482 /* We get a DEFAULT_ARG when looking at an in-class declaration
9483 with a default argument. Ignore the argument for now; we'll
9484 deal with it after the class is complete. */
9493 decl_type = TREE_TYPE (decl);
9495 if (arg == error_mark_node
9496 || decl == error_mark_node
9497 || TREE_TYPE (arg) == error_mark_node
9498 || decl_type == error_mark_node)
9499 /* Something already went wrong. There's no need to check
9501 return error_mark_node;
9503 /* [dcl.fct.default]
9505 A default argument expression is implicitly converted to the
9507 if (!TREE_TYPE (arg)
9508 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9511 error ("default argument for %q#D has type %qT",
9512 decl, TREE_TYPE (arg));
9514 error ("default argument for parameter of type %qT has type %qT",
9515 decl_type, TREE_TYPE (arg));
9517 return error_mark_node;
9520 /* [dcl.fct.default]
9522 Local variables shall not be used in default argument
9525 The keyword `this' shall not be used in a default argument of a
9527 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9530 error ("default argument %qE uses local variable %qD", arg, var);
9531 return error_mark_node;
9538 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9541 type_is_deprecated (tree type)
9543 enum tree_code code;
9544 if (TREE_DEPRECATED (type))
9546 if (TYPE_NAME (type)
9547 && TREE_DEPRECATED (TYPE_NAME (type)))
9550 code = TREE_CODE (type);
9552 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9553 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9554 || code == METHOD_TYPE || code == ARRAY_TYPE)
9555 return type_is_deprecated (TREE_TYPE (type));
9557 if (TYPE_PTRMEMFUNC_P (type))
9558 return type_is_deprecated
9559 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9564 /* Decode the list of parameter types for a function type.
9565 Given the list of things declared inside the parens,
9566 return a list of types.
9568 If this parameter does not end with an ellipsis, we append
9571 *PARMS is set to the chain of PARM_DECLs created. */
9574 grokparms (tree parmlist, tree *parms)
9576 tree result = NULL_TREE;
9577 tree decls = NULL_TREE;
9581 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9583 tree type = NULL_TREE;
9584 tree init = TREE_PURPOSE (parm);
9585 tree decl = TREE_VALUE (parm);
9587 if (parm == void_list_node)
9590 if (! decl || TREE_TYPE (decl) == error_mark_node)
9593 type = TREE_TYPE (decl);
9594 if (VOID_TYPE_P (type))
9596 if (same_type_p (type, void_type_node)
9597 && DECL_SELF_REFERENCE_P (type)
9598 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9599 /* this is a parmlist of `(void)', which is ok. */
9601 cxx_incomplete_type_error (decl, type);
9602 /* It's not a good idea to actually create parameters of
9603 type `void'; other parts of the compiler assume that a
9604 void type terminates the parameter list. */
9605 type = error_mark_node;
9606 TREE_TYPE (decl) = error_mark_node;
9609 if (type != error_mark_node
9610 && TYPE_FOR_JAVA (type)
9611 && MAYBE_CLASS_TYPE_P (type))
9613 error ("parameter %qD has Java class type", decl);
9614 type = error_mark_node;
9615 TREE_TYPE (decl) = error_mark_node;
9619 if (type != error_mark_node)
9621 if (deprecated_state != DEPRECATED_SUPPRESS)
9623 tree deptype = type_is_deprecated (type);
9625 warn_deprecated_use (deptype);
9628 /* Top-level qualifiers on the parameters are
9629 ignored for function types. */
9630 type = cp_build_qualified_type (type, 0);
9631 if (TREE_CODE (type) == METHOD_TYPE)
9633 error ("parameter %qD invalidly declared method type", decl);
9634 type = build_pointer_type (type);
9635 TREE_TYPE (decl) = type;
9637 else if (abstract_virtuals_error (decl, type))
9638 any_error = 1; /* Seems like a good idea. */
9639 else if (POINTER_TYPE_P (type))
9641 /* [dcl.fct]/6, parameter types cannot contain pointers
9642 (references) to arrays of unknown bound. */
9643 tree t = TREE_TYPE (type);
9644 int ptr = TYPE_PTR_P (type);
9650 else if (TREE_CODE (t) != ARRAY_TYPE)
9652 else if (!TYPE_DOMAIN (t))
9656 if (TREE_CODE (t) == ARRAY_TYPE)
9657 error ("parameter %qD includes %s to array of unknown "
9659 decl, ptr ? "pointer" : "reference", t);
9664 else if (init && !processing_template_decl)
9665 init = check_default_argument (decl, init);
9668 if (TREE_CODE (decl) == PARM_DECL
9669 && FUNCTION_PARAMETER_PACK_P (decl)
9670 && TREE_CHAIN (parm)
9671 && TREE_CHAIN (parm) != void_list_node)
9672 error ("parameter packs must be at the end of the parameter list");
9674 TREE_CHAIN (decl) = decls;
9676 result = tree_cons (init, type, result);
9678 decls = nreverse (decls);
9679 result = nreverse (result);
9681 result = chainon (result, void_list_node);
9688 /* D is a constructor or overloaded `operator='.
9690 Let T be the class in which D is declared. Then, this function
9693 -1 if D's is an ill-formed constructor or copy assignment operator
9694 whose first parameter is of type `T'.
9695 0 if D is not a copy constructor or copy assignment
9697 1 if D is a copy constructor or copy assignment operator whose
9698 first parameter is a reference to const qualified T.
9699 2 if D is a copy constructor or copy assignment operator whose
9700 first parameter is a reference to non-const qualified T.
9702 This function can be used as a predicate. Positive values indicate
9703 a copy constructor and nonzero values indicate a copy assignment
9707 copy_fn_p (const_tree d)
9713 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9715 if (TREE_CODE (d) == TEMPLATE_DECL
9716 || (DECL_TEMPLATE_INFO (d)
9717 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9718 /* Instantiations of template member functions are never copy
9719 functions. Note that member functions of templated classes are
9720 represented as template functions internally, and we must
9721 accept those as copy functions. */
9724 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9728 arg_type = TREE_VALUE (args);
9729 if (arg_type == error_mark_node)
9732 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9734 /* Pass by value copy assignment operator. */
9737 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9738 && !TYPE_REF_IS_RVALUE (arg_type)
9739 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9741 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9747 args = TREE_CHAIN (args);
9749 if (args && args != void_list_node && !TREE_PURPOSE (args))
9750 /* There are more non-optional args. */
9756 /* D is a constructor or overloaded `operator='.
9758 Let T be the class in which D is declared. Then, this function
9759 returns true when D is a move constructor or move assignment
9760 operator, false otherwise. */
9763 move_fn_p (const_tree d)
9767 bool result = false;
9769 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9771 if (cxx_dialect == cxx98)
9772 /* There are no move constructors if we are in C++98 mode. */
9775 if (TREE_CODE (d) == TEMPLATE_DECL
9776 || (DECL_TEMPLATE_INFO (d)
9777 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9778 /* Instantiations of template member functions are never copy
9779 functions. Note that member functions of templated classes are
9780 represented as template functions internally, and we must
9781 accept those as copy functions. */
9784 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9788 arg_type = TREE_VALUE (args);
9789 if (arg_type == error_mark_node)
9792 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9793 && TYPE_REF_IS_RVALUE (arg_type)
9794 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9798 args = TREE_CHAIN (args);
9800 if (args && args != void_list_node && !TREE_PURPOSE (args))
9801 /* There are more non-optional args. */
9807 /* Remember any special properties of member function DECL. */
9810 grok_special_member_properties (tree decl)
9814 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9817 class_type = DECL_CONTEXT (decl);
9818 if (DECL_CONSTRUCTOR_P (decl))
9820 int ctor = copy_fn_p (decl);
9822 if (!DECL_ARTIFICIAL (decl))
9823 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9829 A non-template constructor for class X is a copy
9830 constructor if its first parameter is of type X&, const
9831 X&, volatile X& or const volatile X&, and either there
9832 are no other parameters or else all other parameters have
9833 default arguments. */
9834 TYPE_HAS_INIT_REF (class_type) = 1;
9835 if (!DECL_DEFAULTED_FN (decl))
9836 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9838 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9840 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9841 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9842 else if (is_list_ctor (decl))
9843 TYPE_HAS_LIST_CTOR (class_type) = 1;
9845 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9849 A non-template assignment operator for class X is a copy
9850 assignment operator if its parameter is of type X, X&, const
9851 X&, volatile X& or const volatile X&. */
9853 int assop = copy_fn_p (decl);
9857 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9858 if (!DECL_DEFAULTED_FN (decl))
9859 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9861 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9866 /* Check a constructor DECL has the correct form. Complains
9867 if the class has a constructor of the form X(X). */
9870 grok_ctor_properties (const_tree ctype, const_tree decl)
9872 int ctor_parm = copy_fn_p (decl);
9878 A declaration of a constructor for a class X is ill-formed if
9879 its first parameter is of type (optionally cv-qualified) X
9880 and either there are no other parameters or else all other
9881 parameters have default arguments.
9883 We *don't* complain about member template instantiations that
9884 have this form, though; they can occur as we try to decide
9885 what constructor to use during overload resolution. Since
9886 overload resolution will never prefer such a constructor to
9887 the non-template copy constructor (which is either explicitly
9888 or implicitly defined), there's no need to worry about their
9889 existence. Theoretically, they should never even be
9890 instantiated, but that's hard to forestall. */
9891 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9899 /* An operator with this code is unary, but can also be binary. */
9902 ambi_op_p (enum tree_code code)
9904 return (code == INDIRECT_REF
9905 || code == ADDR_EXPR
9906 || code == UNARY_PLUS_EXPR
9907 || code == NEGATE_EXPR
9908 || code == PREINCREMENT_EXPR
9909 || code == PREDECREMENT_EXPR);
9912 /* An operator with this name can only be unary. */
9915 unary_op_p (enum tree_code code)
9917 return (code == TRUTH_NOT_EXPR
9918 || code == BIT_NOT_EXPR
9919 || code == COMPONENT_REF
9920 || code == TYPE_EXPR);
9923 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9924 errors are issued for invalid declarations. */
9927 grok_op_properties (tree decl, bool complain)
9929 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9931 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9932 tree name = DECL_NAME (decl);
9933 enum tree_code operator_code;
9938 /* Count the number of arguments and check for ellipsis. */
9939 for (argtype = argtypes, arity = 0;
9940 argtype && argtype != void_list_node;
9941 argtype = TREE_CHAIN (argtype))
9943 ellipsis_p = !argtype;
9945 class_type = DECL_CONTEXT (decl);
9946 if (class_type && !CLASS_TYPE_P (class_type))
9947 class_type = NULL_TREE;
9949 if (DECL_CONV_FN_P (decl))
9950 operator_code = TYPE_EXPR;
9954 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9955 if (ansi_opname (CODE) == name) \
9957 operator_code = (CODE); \
9960 else if (ansi_assopname (CODE) == name) \
9962 operator_code = (CODE); \
9963 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9967 #include "operators.def"
9973 gcc_assert (operator_code != MAX_TREE_CODES);
9974 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9977 switch (operator_code)
9980 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9984 TYPE_GETS_DELETE (class_type) |= 1;
9988 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9991 case VEC_DELETE_EXPR:
9992 TYPE_GETS_DELETE (class_type) |= 2;
9999 /* [basic.std.dynamic.allocation]/1:
10001 A program is ill-formed if an allocation function is declared
10002 in a namespace scope other than global scope or declared static
10005 The same also holds true for deallocation functions. */
10006 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10007 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10009 if (DECL_NAMESPACE_SCOPE_P (decl))
10011 if (CP_DECL_CONTEXT (decl) != global_namespace)
10013 error ("%qD may not be declared within a namespace", decl);
10016 else if (!TREE_PUBLIC (decl))
10018 error ("%qD may not be declared as static", decl);
10024 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10026 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10027 DECL_IS_OPERATOR_NEW (decl) = 1;
10029 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10030 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10033 /* An operator function must either be a non-static member function
10034 or have at least one parameter of a class, a reference to a class,
10035 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10036 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10038 if (operator_code == TYPE_EXPR
10039 || operator_code == CALL_EXPR
10040 || operator_code == COMPONENT_REF
10041 || operator_code == ARRAY_REF
10042 || operator_code == NOP_EXPR)
10044 error ("%qD must be a nonstatic member function", decl);
10051 if (DECL_STATIC_FUNCTION_P (decl))
10053 error ("%qD must be either a non-static member "
10054 "function or a non-member function", decl);
10058 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10060 tree arg = non_reference (TREE_VALUE (p));
10061 if (arg == error_mark_node)
10064 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10065 because these checks are performed even on
10066 template functions. */
10067 if (MAYBE_CLASS_TYPE_P (arg)
10068 || TREE_CODE (arg) == ENUMERAL_TYPE)
10072 if (!p || p == void_list_node)
10075 error ("%qD must have an argument of class or "
10076 "enumerated type", decl);
10082 /* There are no restrictions on the arguments to an overloaded
10084 if (operator_code == CALL_EXPR)
10087 /* Warn about conversion operators that will never be used. */
10088 if (IDENTIFIER_TYPENAME_P (name)
10089 && ! DECL_TEMPLATE_INFO (decl)
10091 /* Warn only declaring the function; there is no need to
10092 warn again about out-of-class definitions. */
10093 && class_type == current_class_type)
10095 tree t = TREE_TYPE (name);
10096 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10097 const char *what = 0;
10100 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10102 if (TREE_CODE (t) == VOID_TYPE)
10104 else if (class_type)
10106 if (t == class_type)
10107 what = "the same type";
10108 /* Don't force t to be complete here. */
10109 else if (MAYBE_CLASS_TYPE_P (t)
10110 && COMPLETE_TYPE_P (t)
10111 && DERIVED_FROM_P (t, class_type))
10112 what = "a base class";
10116 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10117 "conversion operator",
10118 ref ? "a reference to " : "", what);
10121 if (operator_code == COND_EXPR)
10124 error ("ISO C++ prohibits overloading operator ?:");
10127 else if (ellipsis_p)
10129 error ("%qD must not have variable number of arguments", decl);
10132 else if (ambi_op_p (operator_code))
10135 /* We pick the one-argument operator codes by default, so
10136 we don't have to change anything. */
10138 else if (arity == 2)
10140 /* If we thought this was a unary operator, we now know
10141 it to be a binary operator. */
10142 switch (operator_code)
10145 operator_code = MULT_EXPR;
10149 operator_code = BIT_AND_EXPR;
10152 case UNARY_PLUS_EXPR:
10153 operator_code = PLUS_EXPR;
10157 operator_code = MINUS_EXPR;
10160 case PREINCREMENT_EXPR:
10161 operator_code = POSTINCREMENT_EXPR;
10164 case PREDECREMENT_EXPR:
10165 operator_code = POSTDECREMENT_EXPR;
10169 gcc_unreachable ();
10172 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10174 if ((operator_code == POSTINCREMENT_EXPR
10175 || operator_code == POSTDECREMENT_EXPR)
10176 && ! processing_template_decl
10177 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10180 error ("postfix %qD must take %<int%> as its argument",
10183 error ("postfix %qD must take %<int%> as its second "
10191 error ("%qD must take either zero or one argument", decl);
10193 error ("%qD must take either one or two arguments", decl);
10197 /* More Effective C++ rule 6. */
10199 && (operator_code == POSTINCREMENT_EXPR
10200 || operator_code == POSTDECREMENT_EXPR
10201 || operator_code == PREINCREMENT_EXPR
10202 || operator_code == PREDECREMENT_EXPR))
10204 tree arg = TREE_VALUE (argtypes);
10205 tree ret = TREE_TYPE (TREE_TYPE (decl));
10206 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10207 arg = TREE_TYPE (arg);
10208 arg = TYPE_MAIN_VARIANT (arg);
10209 if (operator_code == PREINCREMENT_EXPR
10210 || operator_code == PREDECREMENT_EXPR)
10212 if (TREE_CODE (ret) != REFERENCE_TYPE
10213 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10215 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10216 build_reference_type (arg));
10220 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10221 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10225 else if (unary_op_p (operator_code))
10230 error ("%qD must take %<void%>", decl);
10232 error ("%qD must take exactly one argument", decl);
10236 else /* if (binary_op_p (operator_code)) */
10241 error ("%qD must take exactly one argument", decl);
10243 error ("%qD must take exactly two arguments", decl);
10247 /* More Effective C++ rule 7. */
10249 && (operator_code == TRUTH_ANDIF_EXPR
10250 || operator_code == TRUTH_ORIF_EXPR
10251 || operator_code == COMPOUND_EXPR))
10252 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10256 /* Effective C++ rule 23. */
10259 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10260 && (operator_code == PLUS_EXPR
10261 || operator_code == MINUS_EXPR
10262 || operator_code == TRUNC_DIV_EXPR
10263 || operator_code == MULT_EXPR
10264 || operator_code == TRUNC_MOD_EXPR)
10265 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10266 warning (OPT_Weffc__, "%qD should return by value", decl);
10268 /* [over.oper]/8 */
10269 for (; argtypes && argtypes != void_list_node;
10270 argtypes = TREE_CHAIN (argtypes))
10271 if (TREE_PURPOSE (argtypes))
10273 TREE_PURPOSE (argtypes) = NULL_TREE;
10274 if (operator_code == POSTINCREMENT_EXPR
10275 || operator_code == POSTDECREMENT_EXPR)
10277 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10282 error ("%qD cannot have default arguments", decl);
10290 /* Return a string giving the keyword associate with CODE. */
10292 static const char *
10293 tag_name (enum tag_types code)
10305 case typename_type:
10308 gcc_unreachable ();
10312 /* Name lookup in an elaborated-type-specifier (after the keyword
10313 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10314 elaborated-type-specifier is invalid, issue a diagnostic and return
10315 error_mark_node; otherwise, return the *_TYPE to which it referred.
10316 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10319 check_elaborated_type_specifier (enum tag_types tag_code,
10321 bool allow_template_p)
10327 struct S { struct S *p; };
10329 name lookup will find the TYPE_DECL for the implicit "S::S"
10330 typedef. Adjust for that here. */
10331 if (DECL_SELF_REFERENCE_P (decl))
10332 decl = TYPE_NAME (TREE_TYPE (decl));
10334 type = TREE_TYPE (decl);
10336 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10337 is false for this case as well. */
10338 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10340 error ("using template type parameter %qT after %qs",
10341 type, tag_name (tag_code));
10342 return error_mark_node;
10346 If the identifier resolves to a typedef-name or a template
10347 type-parameter, the elaborated-type-specifier is ill-formed.
10349 In other words, the only legitimate declaration to use in the
10350 elaborated type specifier is the implicit typedef created when
10351 the type is declared. */
10352 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10353 && tag_code != typename_type)
10355 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10356 error ("%q+D has a previous declaration here", decl);
10357 return error_mark_node;
10359 else if (TREE_CODE (type) != RECORD_TYPE
10360 && TREE_CODE (type) != UNION_TYPE
10361 && tag_code != enum_type
10362 && tag_code != typename_type)
10364 error ("%qT referred to as %qs", type, tag_name (tag_code));
10365 error ("%q+T has a previous declaration here", type);
10366 return error_mark_node;
10368 else if (TREE_CODE (type) != ENUMERAL_TYPE
10369 && tag_code == enum_type)
10371 error ("%qT referred to as enum", type);
10372 error ("%q+T has a previous declaration here", type);
10373 return error_mark_node;
10375 else if (!allow_template_p
10376 && TREE_CODE (type) == RECORD_TYPE
10377 && CLASSTYPE_IS_TEMPLATE (type))
10379 /* If a class template appears as elaborated type specifier
10380 without a template header such as:
10382 template <class T> class C {};
10383 void f(class C); // No template header here
10385 then the required template argument is missing. */
10386 error ("template argument required for %<%s %T%>",
10387 tag_name (tag_code),
10388 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10389 return error_mark_node;
10395 /* Lookup NAME in elaborate type specifier in scope according to
10396 SCOPE and issue diagnostics if necessary.
10397 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10398 found, and ERROR_MARK_NODE for type error. */
10401 lookup_and_check_tag (enum tag_types tag_code, tree name,
10402 tag_scope scope, bool template_header_p)
10406 if (scope == ts_global)
10408 /* First try ordinary name lookup, ignoring hidden class name
10409 injected via friend declaration. */
10410 decl = lookup_name_prefer_type (name, 2);
10411 /* If that fails, the name will be placed in the smallest
10412 non-class, non-function-prototype scope according to 3.3.1/5.
10413 We may already have a hidden name declared as friend in this
10414 scope. So lookup again but not ignoring hidden names.
10415 If we find one, that name will be made visible rather than
10416 creating a new tag. */
10418 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10421 decl = lookup_type_scope (name, scope);
10423 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10424 decl = DECL_TEMPLATE_RESULT (decl);
10426 if (decl && TREE_CODE (decl) == TYPE_DECL)
10428 /* Look for invalid nested type:
10432 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10434 error ("%qD has the same name as the class in which it is "
10437 return error_mark_node;
10440 /* Two cases we need to consider when deciding if a class
10441 template is allowed as an elaborated type specifier:
10442 1. It is a self reference to its own class.
10443 2. It comes with a template header.
10447 template <class T> class C {
10448 class C *c1; // DECL_SELF_REFERENCE_P is true
10451 template <class U> class C; // template_header_p is true
10452 template <class T> class C<T>::D {
10453 class C *c2; // DECL_SELF_REFERENCE_P is true
10456 t = check_elaborated_type_specifier (tag_code,
10459 | DECL_SELF_REFERENCE_P (decl));
10462 else if (decl && TREE_CODE (decl) == TREE_LIST)
10464 error ("reference to %qD is ambiguous", name);
10465 print_candidates (decl);
10466 return error_mark_node;
10472 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10473 Define the tag as a forward-reference if it is not defined.
10475 If a declaration is given, process it here, and report an error if
10476 multiple declarations are not identical.
10478 SCOPE is TS_CURRENT when this is also a definition. Only look in
10479 the current frame for the name (since C++ allows new names in any
10480 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10481 declaration. Only look beginning from the current scope outward up
10482 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10484 TEMPLATE_HEADER_P is true when this declaration is preceded by
10485 a set of template parameters. */
10488 xref_tag (enum tag_types tag_code, tree name,
10489 tag_scope scope, bool template_header_p)
10491 enum tree_code code;
10493 tree context = NULL_TREE;
10495 timevar_push (TV_NAME_LOOKUP);
10497 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10503 code = RECORD_TYPE;
10509 code = ENUMERAL_TYPE;
10512 gcc_unreachable ();
10515 /* In case of anonymous name, xref_tag is only called to
10516 make type node and push name. Name lookup is not required. */
10517 if (ANON_AGGRNAME_P (name))
10520 t = lookup_and_check_tag (tag_code, name,
10521 scope, template_header_p);
10523 if (t == error_mark_node)
10524 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10526 if (scope != ts_current && t && current_class_type
10527 && template_class_depth (current_class_type)
10528 && template_header_p)
10530 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10531 definition of this tag. Since, in addition, we are currently
10532 processing a (member) template declaration of a template
10533 class, we must be very careful; consider:
10540 { template <class V>
10541 friend struct S1; };
10543 Here, the S2::S1 declaration should not be confused with the
10544 outer declaration. In particular, the inner version should
10545 have a template parameter of level 2, not level 1. This
10546 would be particularly important if the member declaration
10549 template <class V = U> friend struct S1;
10551 say, when we should tsubst into `U' when instantiating
10552 S2. On the other hand, when presented with:
10562 we must find the inner binding eventually. We
10563 accomplish this by making sure that the new type we
10564 create to represent this declaration has the right
10566 context = TYPE_CONTEXT (t);
10572 /* If no such tag is yet defined, create a forward-reference node
10573 and record it as the "definition".
10574 When a real declaration of this type is found,
10575 the forward-reference will be altered into a real type. */
10576 if (code == ENUMERAL_TYPE)
10578 error ("use of enum %q#D without previous declaration", name);
10579 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10583 t = make_class_type (code);
10584 TYPE_CONTEXT (t) = context;
10585 t = pushtag (name, t, scope);
10590 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10592 if (!redeclare_class_template (t, current_template_parms))
10593 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10595 else if (!processing_template_decl
10596 && CLASS_TYPE_P (t)
10597 && CLASSTYPE_IS_TEMPLATE (t))
10599 error ("redeclaration of %qT as a non-template", t);
10600 error ("previous declaration %q+D", t);
10601 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10604 /* Make injected friend class visible. */
10605 if (scope != ts_within_enclosing_non_class
10606 && hidden_name_p (TYPE_NAME (t)))
10608 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10609 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10611 if (TYPE_TEMPLATE_INFO (t))
10613 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10614 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10619 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10623 xref_tag_from_type (tree old, tree id, tag_scope scope)
10625 enum tag_types tag_kind;
10627 if (TREE_CODE (old) == RECORD_TYPE)
10628 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10630 tag_kind = union_type;
10632 if (id == NULL_TREE)
10633 id = TYPE_IDENTIFIER (old);
10635 return xref_tag (tag_kind, id, scope, false);
10638 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10639 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10640 access_* node, and the TREE_VALUE is the type of the base-class.
10641 Non-NULL TREE_TYPE indicates virtual inheritance.
10643 Returns true if the binfo hierarchy was successfully created,
10644 false if an error was detected. */
10647 xref_basetypes (tree ref, tree base_list)
10650 tree binfo, base_binfo;
10651 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10652 unsigned max_bases = 0; /* Maximum direct bases. */
10654 tree default_access;
10655 tree igo_prev; /* Track Inheritance Graph Order. */
10657 if (ref == error_mark_node)
10660 /* The base of a derived class is private by default, all others are
10662 default_access = (TREE_CODE (ref) == RECORD_TYPE
10663 && CLASSTYPE_DECLARED_CLASS (ref)
10664 ? access_private_node : access_public_node);
10666 /* First, make sure that any templates in base-classes are
10667 instantiated. This ensures that if we call ourselves recursively
10668 we do not get confused about which classes are marked and which
10670 basep = &base_list;
10673 tree basetype = TREE_VALUE (*basep);
10675 if (!(processing_template_decl && uses_template_parms (basetype))
10676 && !complete_type_or_else (basetype, NULL))
10677 /* An incomplete type. Remove it from the list. */
10678 *basep = TREE_CHAIN (*basep);
10682 if (TREE_TYPE (*basep))
10684 if (CLASS_TYPE_P (basetype))
10685 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10686 basep = &TREE_CHAIN (*basep);
10690 TYPE_MARKED_P (ref) = 1;
10692 /* The binfo slot should be empty, unless this is an (ill-formed)
10694 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10695 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10697 binfo = make_tree_binfo (max_bases);
10699 TYPE_BINFO (ref) = binfo;
10700 BINFO_OFFSET (binfo) = size_zero_node;
10701 BINFO_TYPE (binfo) = ref;
10705 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10706 /* An aggregate cannot have baseclasses. */
10707 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10709 if (TREE_CODE (ref) == UNION_TYPE)
10711 error ("derived union %qT invalid", ref);
10718 if (TYPE_FOR_JAVA (ref))
10720 error ("Java class %qT cannot have multiple bases", ref);
10727 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10729 if (TYPE_FOR_JAVA (ref))
10731 error ("Java class %qT cannot have virtual bases", ref);
10736 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10738 tree access = TREE_PURPOSE (base_list);
10739 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10740 tree basetype = TREE_VALUE (base_list);
10742 if (access == access_default_node)
10743 access = default_access;
10745 if (PACK_EXPANSION_P (basetype))
10746 basetype = PACK_EXPANSION_PATTERN (basetype);
10747 if (TREE_CODE (basetype) == TYPE_DECL)
10748 basetype = TREE_TYPE (basetype);
10749 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10751 error ("base type %qT fails to be a struct or class type",
10756 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10757 TYPE_FOR_JAVA (ref) = 1;
10759 base_binfo = NULL_TREE;
10760 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10762 base_binfo = TYPE_BINFO (basetype);
10763 /* The original basetype could have been a typedef'd type. */
10764 basetype = BINFO_TYPE (base_binfo);
10766 /* Inherit flags from the base. */
10767 TYPE_HAS_NEW_OPERATOR (ref)
10768 |= TYPE_HAS_NEW_OPERATOR (basetype);
10769 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10770 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10771 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10772 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10773 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10774 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10775 CLASSTYPE_REPEATED_BASE_P (ref)
10776 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10779 /* We must do this test after we've seen through a typedef
10781 if (TYPE_MARKED_P (basetype))
10783 if (basetype == ref)
10784 error ("recursive type %qT undefined", basetype);
10786 error ("duplicate base type %qT invalid", basetype);
10790 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10791 /* Regenerate the pack expansion for the bases. */
10792 basetype = make_pack_expansion (basetype);
10794 TYPE_MARKED_P (basetype) = 1;
10796 base_binfo = copy_binfo (base_binfo, basetype, ref,
10797 &igo_prev, via_virtual);
10798 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10799 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10801 BINFO_BASE_APPEND (binfo, base_binfo);
10802 BINFO_BASE_ACCESS_APPEND (binfo, access);
10805 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10806 /* If we have space in the vbase vector, we must have shared at
10807 least one of them, and are therefore diamond shaped. */
10808 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10810 /* Unmark all the types. */
10811 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10812 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10813 TYPE_MARKED_P (ref) = 0;
10815 /* Now see if we have a repeated base type. */
10816 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10818 for (base_binfo = binfo; base_binfo;
10819 base_binfo = TREE_CHAIN (base_binfo))
10821 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10823 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10826 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10828 for (base_binfo = binfo; base_binfo;
10829 base_binfo = TREE_CHAIN (base_binfo))
10830 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10831 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10840 /* Begin compiling the definition of an enumeration type.
10843 UNDERLYING_TYPE is the type that will be used as the storage for
10844 the enumeration type. This should be NULL_TREE if no storage type
10847 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10849 Returns the type object, as yet incomplete.
10850 Also records info about it so that build_enumerator
10851 may be used to declare the individual values as they are read. */
10854 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10858 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10860 /* If this is the real definition for a previous forward reference,
10861 fill in the contents in the same object that used to be the
10862 forward reference. */
10864 enumtype = lookup_and_check_tag (enum_type, name,
10865 /*tag_scope=*/ts_current,
10866 /*template_header_p=*/false);
10868 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10870 error ("multiple definition of %q#T", enumtype);
10871 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10872 /* Clear out TYPE_VALUES, and start again. */
10873 TYPE_VALUES (enumtype) = NULL_TREE;
10877 /* In case of error, make a dummy enum to allow parsing to
10879 if (enumtype == error_mark_node)
10880 name = make_anon_name ();
10882 enumtype = make_node (ENUMERAL_TYPE);
10883 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10888 SET_SCOPED_ENUM_P (enumtype, 1);
10889 begin_scope (sk_scoped_enum, enumtype);
10891 /* [C++0x dcl.enum]p5:
10893 If not explicitly specified, the underlying type of a scoped
10894 enumeration type is int. */
10895 if (!underlying_type)
10896 underlying_type = integer_type_node;
10899 if (underlying_type)
10901 if (CP_INTEGRAL_TYPE_P (underlying_type))
10903 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10904 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10905 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10906 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10907 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10908 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10909 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10910 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10911 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10912 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10915 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10916 underlying_type, enumtype);
10922 /* After processing and defining all the values of an enumeration type,
10923 install their decls in the enumeration type and finish it off.
10924 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10927 finish_enum (tree enumtype)
10936 bool use_short_enum;
10940 integer_type_kind itk;
10941 tree underlying_type = NULL_TREE;
10942 bool fixed_underlying_type_p
10943 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
10945 /* We built up the VALUES in reverse order. */
10946 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10948 /* For an enum defined in a template, just set the type of the values;
10949 all further processing is postponed until the template is
10950 instantiated. We need to set the type so that tsubst of a CONST_DECL
10952 if (processing_template_decl)
10954 for (values = TYPE_VALUES (enumtype);
10956 values = TREE_CHAIN (values))
10957 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10958 if (at_function_scope_p ())
10959 add_stmt (build_min (TAG_DEFN, enumtype));
10963 /* Determine the minimum and maximum values of the enumerators. */
10964 if (TYPE_VALUES (enumtype))
10966 minnode = maxnode = NULL_TREE;
10968 for (values = TYPE_VALUES (enumtype);
10970 values = TREE_CHAIN (values))
10972 decl = TREE_VALUE (values);
10974 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10975 each enumerator has the type of its enumeration. Prior to the
10976 closing brace, the type of each enumerator is the type of its
10977 initializing value. */
10978 TREE_TYPE (decl) = enumtype;
10980 /* Update the minimum and maximum values, if appropriate. */
10981 value = DECL_INITIAL (decl);
10982 if (value == error_mark_node)
10983 value = integer_zero_node;
10984 /* Figure out what the minimum and maximum values of the
10985 enumerators are. */
10987 minnode = maxnode = value;
10988 else if (tree_int_cst_lt (maxnode, value))
10990 else if (tree_int_cst_lt (value, minnode))
10997 If the enumerator-list is empty, the underlying type is as if
10998 the enumeration had a single enumerator with value 0. */
10999 minnode = maxnode = integer_zero_node;
11001 /* Compute the number of bits require to represent all values of the
11002 enumeration. We must do this before the type of MINNODE and
11003 MAXNODE are transformed, since tree_int_cst_min_precision relies
11004 on the TREE_TYPE of the value it is passed. */
11005 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11006 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11007 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11008 precision = MAX (lowprec, highprec);
11010 if (!fixed_underlying_type_p)
11012 /* Determine the underlying type of the enumeration.
11016 The underlying type of an enumeration is an integral type that
11017 can represent all the enumerator values defined in the
11018 enumeration. It is implementation-defined which integral type is
11019 used as the underlying type for an enumeration except that the
11020 underlying type shall not be larger than int unless the value of
11021 an enumerator cannot fit in an int or unsigned int.
11023 We use "int" or an "unsigned int" as the underlying type, even if
11024 a smaller integral type would work, unless the user has
11025 explicitly requested that we use the smallest possible type. The
11026 user can request that for all enumerations with a command line
11027 flag, or for just one enumeration with an attribute. */
11029 use_short_enum = flag_short_enums
11030 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11032 for (itk = (use_short_enum ? itk_char : itk_int);
11036 underlying_type = integer_types[itk];
11037 if (TYPE_PRECISION (underlying_type) >= precision
11038 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11041 if (itk == itk_none)
11045 IF no integral type can represent all the enumerator values, the
11046 enumeration is ill-formed. */
11047 error ("no integral type can represent all of the enumerator values "
11048 "for %qT", enumtype);
11049 precision = TYPE_PRECISION (long_long_integer_type_node);
11050 underlying_type = integer_types[itk_unsigned_long_long];
11055 The value of sizeof() applied to an enumeration type, an object
11056 of an enumeration type, or an enumerator, is the value of sizeof()
11057 applied to the underlying type. */
11058 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11059 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11060 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
11061 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11062 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11063 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11065 /* Set the underlying type of the enumeration type to the
11066 computed enumeration type, restricted to the enumerator
11068 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
11069 set_min_and_max_values_for_integral_type
11070 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11073 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11075 /* Compute the minimum and maximum values for the type.
11079 For an enumeration where emin is the smallest enumerator and emax
11080 is the largest, the values of the enumeration are the values of the
11081 underlying type in the range bmin to bmax, where bmin and bmax are,
11082 respectively, the smallest and largest values of the smallest bit-
11083 field that can store emin and emax. */
11085 /* The middle-end currently assumes that types with TYPE_PRECISION
11086 narrower than their underlying type are suitably zero or sign
11087 extended to fill their mode. g++ doesn't make these guarantees.
11088 Until the middle-end can represent such paradoxical types, we
11089 set the TYPE_PRECISION to the width of the underlying type. */
11090 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11092 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11094 /* Convert each of the enumerators to the type of the underlying
11095 type of the enumeration. */
11096 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11098 location_t saved_location;
11100 decl = TREE_VALUE (values);
11101 saved_location = input_location;
11102 input_location = DECL_SOURCE_LOCATION (decl);
11103 if (fixed_underlying_type_p)
11104 /* If the enumeration type has a fixed underlying type, we
11105 already checked all of the enumerator values. */
11106 value = DECL_INITIAL (decl);
11108 value = perform_implicit_conversion (underlying_type,
11109 DECL_INITIAL (decl),
11110 tf_warning_or_error);
11111 input_location = saved_location;
11113 /* Do not clobber shared ints. */
11114 value = copy_node (value);
11116 TREE_TYPE (value) = enumtype;
11117 DECL_INITIAL (decl) = value;
11120 /* Fix up all variant types of this enum type. */
11121 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11123 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11124 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11125 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11126 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11127 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11128 TYPE_MODE (t) = TYPE_MODE (enumtype);
11129 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11130 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11131 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11132 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11133 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11136 /* Finish up the scope of a scoped enumeration. */
11137 if (SCOPED_ENUM_P (enumtype))
11140 /* Finish debugging output for this type. */
11141 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11144 /* Build and install a CONST_DECL for an enumeration constant of the
11145 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11146 Assignment of sequential values by default is handled here. */
11149 build_enumerator (tree name, tree value, tree enumtype)
11155 /* If the VALUE was erroneous, pretend it wasn't there; that will
11156 result in the enum being assigned the next value in sequence. */
11157 if (value == error_mark_node)
11160 /* Remove no-op casts from the value. */
11162 STRIP_TYPE_NOPS (value);
11164 if (! processing_template_decl)
11166 /* Validate and default VALUE. */
11167 if (value != NULL_TREE)
11169 value = integral_constant_value (value);
11171 if (TREE_CODE (value) == INTEGER_CST)
11173 value = perform_integral_promotions (value);
11174 constant_expression_warning (value);
11178 error ("enumerator value for %qD is not an integer constant", name);
11183 /* Default based on previous value. */
11184 if (value == NULL_TREE)
11186 if (TYPE_VALUES (enumtype))
11189 unsigned HOST_WIDE_INT lo;
11193 /* The next value is the previous value plus one.
11194 add_double doesn't know the type of the target expression,
11195 so we must check with int_fits_type_p as well. */
11196 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11197 if (error_operand_p (prev_value))
11198 value = error_mark_node;
11201 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11202 TREE_INT_CST_HIGH (prev_value),
11204 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11206 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11210 error ("overflow in enumeration values at %qD", name);
11211 value = error_mark_node;
11216 value = integer_zero_node;
11219 /* Remove no-op casts from the value. */
11220 STRIP_TYPE_NOPS (value);
11222 /* If the underlying type of the enum is fixed, check whether
11223 the enumerator values fits in the underlying type. If it
11224 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11225 if (ENUM_UNDERLYING_TYPE (enumtype)
11227 && TREE_CODE (value) == INTEGER_CST
11228 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11230 error ("enumerator value %E is too large for underlying type %<%T%>",
11231 value, ENUM_UNDERLYING_TYPE (enumtype));
11233 /* Silently convert the value so that we can continue. */
11234 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11239 /* C++ associates enums with global, function, or class declarations. */
11240 context = current_scope ();
11242 /* Build the actual enumeration constant. Note that the enumeration
11243 constants have the underlying type of the enum (if it is fixed)
11244 or the type of their initializer (if the underlying type of the
11245 enum is not fixed):
11249 If the underlying type is fixed, the type of each enumerator
11250 prior to the closing brace is the underlying type; if the
11251 initializing value of an enumerator cannot be represented by
11252 the underlying type, the program is ill-formed. If the
11253 underlying type is not fixed, the type of each enumerator is
11254 the type of its initializing value.
11256 If the underlying type is not fixed, it will be computed by
11257 finish_enum and we will reset the type of this enumerator. Of
11258 course, if we're processing a template, there may be no value. */
11259 type = value ? TREE_TYPE (value) : NULL_TREE;
11261 if (context && context == current_class_type)
11262 /* This enum declaration is local to the class. We need the full
11263 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11264 decl = build_lang_decl (CONST_DECL, name, type);
11266 /* It's a global enum, or it's local to a function. (Note local to
11267 a function could mean local to a class method. */
11268 decl = build_decl (CONST_DECL, name, type);
11270 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11271 TREE_CONSTANT (decl) = 1;
11272 TREE_READONLY (decl) = 1;
11273 DECL_INITIAL (decl) = value;
11275 if (context && context == current_class_type)
11276 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11277 on the TYPE_FIELDS list for `S'. (That's so that you can say
11278 things like `S::i' later.) */
11279 finish_member_declaration (decl);
11283 /* Add this enumeration constant to the list for this type. */
11284 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11287 /* Look for an enumerator with the given NAME within the enumeration
11288 type ENUMTYPE. This routine is used primarily for qualified name
11289 lookup into an enumerator in C++0x, e.g.,
11291 enum class Color { Red, Green, Blue };
11293 Color color = Color::Red;
11295 Returns the value corresponding to the enumerator, or
11296 NULL_TREE if no such enumerator was found. */
11298 lookup_enumerator (tree enumtype, tree name)
11301 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11303 e = purpose_member (name, TYPE_VALUES (enumtype));
11304 return e? TREE_VALUE (e) : NULL_TREE;
11308 /* We're defining DECL. Make sure that it's type is OK. */
11311 check_function_type (tree decl, tree current_function_parms)
11313 tree fntype = TREE_TYPE (decl);
11314 tree return_type = complete_type (TREE_TYPE (fntype));
11316 /* In a function definition, arg types must be complete. */
11317 require_complete_types_for_parms (current_function_parms);
11319 if (dependent_type_p (return_type))
11321 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11322 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11324 tree args = TYPE_ARG_TYPES (fntype);
11326 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11327 error ("return type %q#T is incomplete", return_type);
11329 error ("return type has Java class type %q#T", return_type);
11331 /* Make it return void instead. */
11332 if (TREE_CODE (fntype) == METHOD_TYPE)
11333 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11335 TREE_CHAIN (args));
11337 fntype = build_function_type (void_type_node, args);
11339 = build_exception_variant (fntype,
11340 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11343 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11346 /* Create the FUNCTION_DECL for a function definition.
11347 DECLSPECS and DECLARATOR are the parts of the declaration;
11348 they describe the function's name and the type it returns,
11349 but twisted together in a fashion that parallels the syntax of C.
11351 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11352 DECLARATOR is really the DECL for the function we are about to
11353 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11354 indicating that the function is an inline defined in-class.
11356 This function creates a binding context for the function body
11357 as well as setting up the FUNCTION_DECL in current_function_decl.
11359 For C++, we must first check whether that datum makes any sense.
11360 For example, "class A local_a(1,2);" means that variable local_a
11361 is an aggregate of type A, which should have a constructor
11362 applied to it with the argument list [1, 2].
11364 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11365 or may be a BLOCK if the function has been defined previously
11366 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11367 error_mark_node if the function has never been defined, or
11368 a BLOCK if the function has been defined somewhere. */
11371 start_preparsed_function (tree decl1, tree attrs, int flags)
11373 tree ctype = NULL_TREE;
11376 int doing_friend = 0;
11377 struct cp_binding_level *bl;
11378 tree current_function_parms;
11379 struct c_fileinfo *finfo
11380 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11381 bool honor_interface;
11383 /* Sanity check. */
11384 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11385 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11387 fntype = TREE_TYPE (decl1);
11388 if (TREE_CODE (fntype) == METHOD_TYPE)
11389 ctype = TYPE_METHOD_BASETYPE (fntype);
11391 /* ISO C++ 11.4/5. A friend function defined in a class is in
11392 the (lexical) scope of the class in which it is defined. */
11393 if (!ctype && DECL_FRIEND_P (decl1))
11395 ctype = DECL_FRIEND_CONTEXT (decl1);
11397 /* CTYPE could be null here if we're dealing with a template;
11398 for example, `inline friend float foo()' inside a template
11399 will have no CTYPE set. */
11400 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11406 if (DECL_DECLARED_INLINE_P (decl1)
11407 && lookup_attribute ("noinline", attrs))
11408 warning (0, "inline function %q+D given attribute noinline", decl1);
11410 /* Handle gnu_inline attribute. */
11411 if (GNU_INLINE_P (decl1))
11413 DECL_EXTERNAL (decl1) = 1;
11414 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11415 DECL_INTERFACE_KNOWN (decl1) = 1;
11416 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11419 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11420 /* This is a constructor, we must ensure that any default args
11421 introduced by this definition are propagated to the clones
11422 now. The clones are used directly in overload resolution. */
11423 adjust_clone_args (decl1);
11425 /* Sometimes we don't notice that a function is a static member, and
11426 build a METHOD_TYPE for it. Fix that up now. */
11427 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11428 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11430 revert_static_member_fn (decl1);
11434 /* Set up current_class_type, and enter the scope of the class, if
11437 push_nested_class (ctype);
11438 else if (DECL_STATIC_FUNCTION_P (decl1))
11439 push_nested_class (DECL_CONTEXT (decl1));
11441 /* Now that we have entered the scope of the class, we must restore
11442 the bindings for any template parameters surrounding DECL1, if it
11443 is an inline member template. (Order is important; consider the
11444 case where a template parameter has the same name as a field of
11445 the class.) It is not until after this point that
11446 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11447 if (flags & SF_INCLASS_INLINE)
11448 maybe_begin_member_template_processing (decl1);
11450 /* Effective C++ rule 15. */
11452 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11453 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11454 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11456 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11457 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11458 if (!DECL_INITIAL (decl1))
11459 DECL_INITIAL (decl1) = error_mark_node;
11461 /* This function exists in static storage.
11462 (This does not mean `static' in the C sense!) */
11463 TREE_STATIC (decl1) = 1;
11465 /* We must call push_template_decl after current_class_type is set
11466 up. (If we are processing inline definitions after exiting a
11467 class scope, current_class_type will be NULL_TREE until set above
11468 by push_nested_class.) */
11469 if (processing_template_decl)
11471 /* FIXME: Handle error_mark_node more gracefully. */
11472 tree newdecl1 = push_template_decl (decl1);
11473 if (newdecl1 != error_mark_node)
11477 /* We are now in the scope of the function being defined. */
11478 current_function_decl = decl1;
11480 /* Save the parm names or decls from this function's declarator
11481 where store_parm_decls will find them. */
11482 current_function_parms = DECL_ARGUMENTS (decl1);
11484 /* Make sure the parameter and return types are reasonable. When
11485 you declare a function, these types can be incomplete, but they
11486 must be complete when you define the function. */
11487 check_function_type (decl1, current_function_parms);
11489 /* Build the return declaration for the function. */
11490 restype = TREE_TYPE (fntype);
11491 if (DECL_RESULT (decl1) == NULL_TREE)
11495 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11496 DECL_ARTIFICIAL (resdecl) = 1;
11497 DECL_IGNORED_P (resdecl) = 1;
11498 DECL_RESULT (decl1) = resdecl;
11500 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11503 /* Let the user know we're compiling this function. */
11504 announce_function (decl1);
11506 /* Record the decl so that the function name is defined.
11507 If we already have a decl for this name, and it is a FUNCTION_DECL,
11508 use the old decl. */
11509 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11511 /* A specialization is not used to guide overload resolution. */
11512 if (!DECL_FUNCTION_MEMBER_P (decl1)
11513 && !(DECL_USE_TEMPLATE (decl1) &&
11514 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11516 tree olddecl = pushdecl (decl1);
11518 if (olddecl == error_mark_node)
11519 /* If something went wrong when registering the declaration,
11520 use DECL1; we have to have a FUNCTION_DECL to use when
11521 parsing the body of the function. */
11525 /* Otherwise, OLDDECL is either a previous declaration
11526 of the same function or DECL1 itself. */
11528 if (warn_missing_declarations
11529 && olddecl == decl1
11530 && !DECL_MAIN_P (decl1)
11531 && TREE_PUBLIC (decl1)
11532 && !DECL_DECLARED_INLINE_P (decl1))
11536 /* Check whether DECL1 is in an anonymous
11538 for (context = DECL_CONTEXT (decl1);
11540 context = DECL_CONTEXT (context))
11542 if (TREE_CODE (context) == NAMESPACE_DECL
11543 && DECL_NAME (context) == NULL_TREE)
11547 if (context == NULL)
11548 warning (OPT_Wmissing_declarations,
11549 "no previous declaration for %q+D", decl1);
11557 /* We need to set the DECL_CONTEXT. */
11558 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11559 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11561 fntype = TREE_TYPE (decl1);
11563 /* If #pragma weak applies, mark the decl appropriately now.
11564 The pragma only applies to global functions. Because
11565 determining whether or not the #pragma applies involves
11566 computing the mangled name for the declaration, we cannot
11567 apply the pragma until after we have merged this declaration
11568 with any previous declarations; if the original declaration
11569 has a linkage specification, that specification applies to
11570 the definition as well, and may affect the mangled name. */
11571 if (!DECL_CONTEXT (decl1))
11572 maybe_apply_pragma_weak (decl1);
11575 /* Reset this in case the call to pushdecl changed it. */
11576 current_function_decl = decl1;
11578 gcc_assert (DECL_INITIAL (decl1));
11580 /* This function may already have been parsed, in which case just
11581 return; our caller will skip over the body without parsing. */
11582 if (DECL_INITIAL (decl1) != error_mark_node)
11585 /* Initialize RTL machinery. We cannot do this until
11586 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11587 even when processing a template; this is how we get
11588 CFUN set up, and our per-function variables initialized.
11589 FIXME factor out the non-RTL stuff. */
11590 bl = current_binding_level;
11591 allocate_struct_function (decl1, processing_template_decl);
11593 /* Initialize the language data structures. Whenever we start
11594 a new function, we destroy temporaries in the usual way. */
11595 cfun->language = GGC_CNEW (struct language_function);
11596 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11597 current_binding_level = bl;
11599 /* Even though we're inside a function body, we still don't want to
11600 call expand_expr to calculate the size of a variable-sized array.
11601 We haven't necessarily assigned RTL to all variables yet, so it's
11602 not safe to try to expand expressions involving them. */
11603 cfun->dont_save_pending_sizes_p = 1;
11605 /* Start the statement-tree, start the tree now. */
11606 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11608 /* If we are (erroneously) defining a function that we have already
11609 defined before, wipe out what we knew before. */
11610 if (!DECL_PENDING_INLINE_P (decl1))
11611 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11613 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11615 /* We know that this was set up by `grokclassfn'. We do not
11616 wait until `store_parm_decls', since evil parse errors may
11617 never get us to that point. Here we keep the consistency
11618 between `current_class_type' and `current_class_ptr'. */
11619 tree t = DECL_ARGUMENTS (decl1);
11621 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11622 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11624 cp_function_chain->x_current_class_ref
11625 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11626 cp_function_chain->x_current_class_ptr = t;
11628 /* Constructors and destructors need to know whether they're "in
11629 charge" of initializing virtual base classes. */
11630 t = TREE_CHAIN (t);
11631 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11633 current_in_charge_parm = t;
11634 t = TREE_CHAIN (t);
11636 if (DECL_HAS_VTT_PARM_P (decl1))
11638 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11639 current_vtt_parm = t;
11643 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11644 /* Implicitly-defined methods (like the
11645 destructor for a class in which no destructor
11646 is explicitly declared) must not be defined
11647 until their definition is needed. So, we
11648 ignore interface specifications for
11649 compiler-generated functions. */
11650 && !DECL_ARTIFICIAL (decl1));
11652 if (DECL_INTERFACE_KNOWN (decl1))
11654 tree ctx = decl_function_context (decl1);
11656 if (DECL_NOT_REALLY_EXTERN (decl1))
11657 DECL_EXTERNAL (decl1) = 0;
11659 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11660 && TREE_PUBLIC (ctx))
11661 /* This is a function in a local class in an extern inline
11663 comdat_linkage (decl1);
11665 /* If this function belongs to an interface, it is public.
11666 If it belongs to someone else's interface, it is also external.
11667 This only affects inlines and template instantiations. */
11668 else if (!finfo->interface_unknown && honor_interface)
11670 if (DECL_DECLARED_INLINE_P (decl1)
11671 || DECL_TEMPLATE_INSTANTIATION (decl1)
11672 || processing_template_decl)
11674 DECL_EXTERNAL (decl1)
11675 = (finfo->interface_only
11676 || (DECL_DECLARED_INLINE_P (decl1)
11677 && ! flag_implement_inlines
11678 && !DECL_VINDEX (decl1)));
11680 /* For WIN32 we also want to put these in linkonce sections. */
11681 maybe_make_one_only (decl1);
11684 DECL_EXTERNAL (decl1) = 0;
11685 DECL_INTERFACE_KNOWN (decl1) = 1;
11686 /* If this function is in an interface implemented in this file,
11687 make sure that the back end knows to emit this function
11689 if (!DECL_EXTERNAL (decl1))
11690 mark_needed (decl1);
11692 else if (finfo->interface_unknown && finfo->interface_only
11693 && honor_interface)
11695 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11696 interface, we will have both finfo->interface_unknown and
11697 finfo->interface_only set. In that case, we don't want to
11698 use the normal heuristics because someone will supply a
11699 #pragma implementation elsewhere, and deducing it here would
11700 produce a conflict. */
11701 comdat_linkage (decl1);
11702 DECL_EXTERNAL (decl1) = 0;
11703 DECL_INTERFACE_KNOWN (decl1) = 1;
11704 DECL_DEFER_OUTPUT (decl1) = 1;
11708 /* This is a definition, not a reference.
11709 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11710 if (!GNU_INLINE_P (decl1))
11711 DECL_EXTERNAL (decl1) = 0;
11713 if ((DECL_DECLARED_INLINE_P (decl1)
11714 || DECL_TEMPLATE_INSTANTIATION (decl1))
11715 && ! DECL_INTERFACE_KNOWN (decl1)
11716 /* Don't try to defer nested functions for now. */
11717 && ! decl_function_context (decl1))
11718 DECL_DEFER_OUTPUT (decl1) = 1;
11720 DECL_INTERFACE_KNOWN (decl1) = 1;
11723 /* Determine the ELF visibility attribute for the function. We must not
11724 do this before calling "pushdecl", as we must allow "duplicate_decls"
11725 to merge any attributes appropriately. We also need to wait until
11727 if (!DECL_CLONED_FUNCTION_P (decl1))
11728 determine_visibility (decl1);
11730 begin_scope (sk_function_parms, decl1);
11734 if (DECL_DESTRUCTOR_P (decl1)
11735 || (DECL_CONSTRUCTOR_P (decl1)
11736 && targetm.cxx.cdtor_returns_this ()))
11738 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11739 DECL_CONTEXT (cdtor_label) = current_function_decl;
11742 start_fname_decls ();
11744 store_parm_decls (current_function_parms);
11748 /* Like start_preparsed_function, except that instead of a
11749 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11751 Returns 1 on success. If the DECLARATOR is not suitable for a function
11752 (it defines a datum instead), we return 0, which tells
11753 yyparse to report a parse error. */
11756 start_function (cp_decl_specifier_seq *declspecs,
11757 const cp_declarator *declarator,
11762 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11763 /* If the declarator is not suitable for a function definition,
11764 cause a syntax error. */
11765 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11768 if (DECL_MAIN_P (decl1))
11769 /* main must return int. grokfndecl should have corrected it
11770 (and issued a diagnostic) if the user got it wrong. */
11771 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11772 integer_type_node));
11774 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11779 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11783 use_eh_spec_block (tree fn)
11785 return (flag_exceptions && flag_enforce_eh_specs
11786 && !processing_template_decl
11787 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11788 /* We insert the EH_SPEC_BLOCK only in the original
11789 function; then, it is copied automatically to the
11791 && !DECL_CLONED_FUNCTION_P (fn)
11792 /* Implicitly-generated constructors and destructors have
11793 exception specifications. However, those specifications
11794 are the union of the possible exceptions specified by the
11795 constructors/destructors for bases and members, so no
11796 unallowed exception will ever reach this function. By
11797 not creating the EH_SPEC_BLOCK we save a little memory,
11798 and we avoid spurious warnings about unreachable
11800 && !DECL_ARTIFICIAL (fn));
11803 /* Store the parameter declarations into the current function declaration.
11804 This is called after parsing the parameter declarations, before
11805 digesting the body of the function.
11807 Also install to binding contour return value identifier, if any. */
11810 store_parm_decls (tree current_function_parms)
11812 tree fndecl = current_function_decl;
11815 /* This is a chain of any other decls that came in among the parm
11816 declarations. If a parm is declared with enum {foo, bar} x;
11817 then CONST_DECLs for foo and bar are put here. */
11818 tree nonparms = NULL_TREE;
11820 if (current_function_parms)
11822 /* This case is when the function was defined with an ANSI prototype.
11823 The parms already have decls, so we need not do anything here
11824 except record them as in effect
11825 and complain if any redundant old-style parm decls were written. */
11827 tree specparms = current_function_parms;
11830 /* Must clear this because it might contain TYPE_DECLs declared
11832 current_binding_level->names = NULL;
11834 /* If we're doing semantic analysis, then we'll call pushdecl
11835 for each of these. We must do them in reverse order so that
11836 they end in the correct forward order. */
11837 specparms = nreverse (specparms);
11839 for (parm = specparms; parm; parm = next)
11841 next = TREE_CHAIN (parm);
11842 if (TREE_CODE (parm) == PARM_DECL)
11844 if (DECL_NAME (parm) == NULL_TREE
11845 || TREE_CODE (parm) != VOID_TYPE)
11848 error ("parameter %qD declared void", parm);
11852 /* If we find an enum constant or a type tag,
11853 put it aside for the moment. */
11854 TREE_CHAIN (parm) = NULL_TREE;
11855 nonparms = chainon (nonparms, parm);
11859 /* Get the decls in their original chain order and record in the
11860 function. This is all and only the PARM_DECLs that were
11861 pushed into scope by the loop above. */
11862 DECL_ARGUMENTS (fndecl) = getdecls ();
11865 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11867 /* Now store the final chain of decls for the arguments
11868 as the decl-chain of the current lexical scope.
11869 Put the enumerators in as well, at the front so that
11870 DECL_ARGUMENTS is not modified. */
11871 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11873 if (use_eh_spec_block (current_function_decl))
11874 current_eh_spec_block = begin_eh_spec_block ();
11878 /* We have finished doing semantic analysis on DECL, but have not yet
11879 generated RTL for its body. Save away our current state, so that
11880 when we want to generate RTL later we know what to do. */
11883 save_function_data (tree decl)
11885 struct language_function *f;
11887 /* Save the language-specific per-function data so that we can
11888 get it back when we really expand this function. */
11889 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11892 f = GGC_NEW (struct language_function);
11893 memcpy (f, cp_function_chain, sizeof (struct language_function));
11894 DECL_SAVED_FUNCTION_DATA (decl) = f;
11896 /* Clear out the bits we don't need. */
11897 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11898 f->bindings = NULL;
11899 f->x_local_names = NULL;
11903 /* Set the return value of the constructor (if present). */
11906 finish_constructor_body (void)
11911 if (targetm.cxx.cdtor_returns_this ()
11912 && (! TYPE_FOR_JAVA (current_class_type)))
11914 /* Any return from a constructor will end up here. */
11915 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11917 val = DECL_ARGUMENTS (current_function_decl);
11918 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11919 DECL_RESULT (current_function_decl), val);
11920 /* Return the address of the object. */
11921 exprstmt = build_stmt (RETURN_EXPR, val);
11922 add_stmt (exprstmt);
11926 /* Do all the processing for the beginning of a destructor; set up the
11927 vtable pointers and cleanups for bases and members. */
11930 begin_destructor_body (void)
11932 tree compound_stmt;
11934 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11935 issued an error message. We still want to try to process the
11936 body of the function, but initialize_vtbl_ptrs will crash if
11937 TYPE_BINFO is NULL. */
11938 if (COMPLETE_TYPE_P (current_class_type))
11940 compound_stmt = begin_compound_stmt (0);
11941 /* Make all virtual function table pointers in non-virtual base
11942 classes point to CURRENT_CLASS_TYPE's virtual function
11944 initialize_vtbl_ptrs (current_class_ptr);
11945 finish_compound_stmt (compound_stmt);
11947 /* And insert cleanups for our bases and members so that they
11948 will be properly destroyed if we throw. */
11949 push_base_cleanups ();
11953 /* At the end of every destructor we generate code to delete the object if
11954 necessary. Do that now. */
11957 finish_destructor_body (void)
11961 /* Any return from a destructor will end up here; that way all base
11962 and member cleanups will be run when the function returns. */
11963 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11965 /* In a virtual destructor, we must call delete. */
11966 if (DECL_VIRTUAL_P (current_function_decl))
11969 tree virtual_size = cxx_sizeof (current_class_type);
11973 At the point of definition of a virtual destructor (including
11974 an implicit definition), non-placement operator delete shall
11975 be looked up in the scope of the destructor's class and if
11976 found shall be accessible and unambiguous. */
11977 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11979 /*global_p=*/false,
11980 /*placement=*/NULL_TREE,
11981 /*alloc_fn=*/NULL_TREE);
11983 if_stmt = begin_if_stmt ();
11984 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11985 current_in_charge_parm,
11988 finish_expr_stmt (exprstmt);
11989 finish_then_clause (if_stmt);
11990 finish_if_stmt (if_stmt);
11993 if (targetm.cxx.cdtor_returns_this ())
11997 val = DECL_ARGUMENTS (current_function_decl);
11998 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11999 DECL_RESULT (current_function_decl), val);
12000 /* Return the address of the object. */
12001 exprstmt = build_stmt (RETURN_EXPR, val);
12002 add_stmt (exprstmt);
12006 /* Do the necessary processing for the beginning of a function body, which
12007 in this case includes member-initializers, but not the catch clauses of
12008 a function-try-block. Currently, this means opening a binding level
12009 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12012 begin_function_body (void)
12016 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12019 if (processing_template_decl)
12020 /* Do nothing now. */;
12022 /* Always keep the BLOCK node associated with the outermost pair of
12023 curly braces of a function. These are needed for correct
12024 operation of dwarfout.c. */
12025 keep_next_level (true);
12027 stmt = begin_compound_stmt (BCS_FN_BODY);
12029 if (processing_template_decl)
12030 /* Do nothing now. */;
12031 else if (DECL_DESTRUCTOR_P (current_function_decl))
12032 begin_destructor_body ();
12037 /* Do the processing for the end of a function body. Currently, this means
12038 closing out the cleanups for fully-constructed bases and members, and in
12039 the case of the destructor, deleting the object if desired. Again, this
12040 is only meaningful for [cd]tors, since they are the only functions where
12041 there is a significant distinction between the main body and any
12042 function catch clauses. Handling, say, main() return semantics here
12043 would be wrong, as flowing off the end of a function catch clause for
12044 main() would also need to return 0. */
12047 finish_function_body (tree compstmt)
12049 if (compstmt == NULL_TREE)
12052 /* Close the block. */
12053 finish_compound_stmt (compstmt);
12055 if (processing_template_decl)
12056 /* Do nothing now. */;
12057 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12058 finish_constructor_body ();
12059 else if (DECL_DESTRUCTOR_P (current_function_decl))
12060 finish_destructor_body ();
12063 /* Given a function, returns the BLOCK corresponding to the outermost level
12064 of curly braces, skipping the artificial block created for constructor
12068 outer_curly_brace_block (tree fndecl)
12070 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12071 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12072 /* Skip the artificial function body block. */
12073 block = BLOCK_SUBBLOCKS (block);
12077 /* Finish up a function declaration and compile that function
12078 all the way to assembler language output. The free the storage
12079 for the function definition.
12081 FLAGS is a bitwise or of the following values:
12083 We just finished processing the body of an in-class inline
12084 function definition. (This processing will have taken place
12085 after the class definition is complete.) */
12088 finish_function (int flags)
12090 tree fndecl = current_function_decl;
12091 tree fntype, ctype = NULL_TREE;
12092 int inclass_inline = (flags & 2) != 0;
12095 /* When we get some parse errors, we can end up without a
12096 current_function_decl, so cope. */
12097 if (fndecl == NULL_TREE)
12098 return error_mark_node;
12100 gcc_assert (!defer_mark_used_calls);
12101 defer_mark_used_calls = true;
12103 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12104 && DECL_VIRTUAL_P (fndecl)
12105 && !processing_template_decl)
12107 tree fnclass = DECL_CONTEXT (fndecl);
12108 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12109 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12112 nested = function_depth > 1;
12113 fntype = TREE_TYPE (fndecl);
12115 /* TREE_READONLY (fndecl) = 1;
12116 This caused &foo to be of type ptr-to-const-function
12117 which then got a warning when stored in a ptr-to-function variable. */
12119 gcc_assert (building_stmt_tree ());
12120 /* The current function is being defined, so its DECL_INITIAL should
12121 be set, and unless there's a multiple definition, it should be
12122 error_mark_node. */
12123 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12125 /* For a cloned function, we've already got all the code we need;
12126 there's no need to add any extra bits. */
12127 if (!DECL_CLONED_FUNCTION_P (fndecl))
12129 if (DECL_MAIN_P (current_function_decl))
12133 /* Make it so that `main' always returns 0 by default (or
12136 stmt = finish_return_stmt (integer_one_node);
12138 stmt = finish_return_stmt (integer_zero_node);
12140 /* Hack. We don't want the middle-end to warn that this
12141 return is unreachable, so put the statement on the
12144 location_t linezero = linemap_line_start (line_table, 0, 1);
12145 SET_EXPR_LOCATION (stmt, linezero);
12149 if (use_eh_spec_block (current_function_decl))
12150 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12151 (TREE_TYPE (current_function_decl)),
12152 current_eh_spec_block);
12155 /* If we're saving up tree structure, tie off the function now. */
12156 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12158 finish_fname_decls ();
12160 /* If this function can't throw any exceptions, remember that. */
12161 if (!processing_template_decl
12162 && !cp_function_chain->can_throw
12163 && !flag_non_call_exceptions
12164 && !DECL_REPLACEABLE_P (fndecl))
12165 TREE_NOTHROW (fndecl) = 1;
12167 /* This must come after expand_function_end because cleanups might
12168 have declarations (from inline functions) that need to go into
12169 this function's blocks. */
12171 /* If the current binding level isn't the outermost binding level
12172 for this function, either there is a bug, or we have experienced
12173 syntax errors and the statement tree is malformed. */
12174 if (current_binding_level->kind != sk_function_parms)
12176 /* Make sure we have already experienced errors. */
12177 gcc_assert (errorcount);
12179 /* Throw away the broken statement tree and extra binding
12181 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12183 while (current_binding_level->kind != sk_function_parms)
12185 if (current_binding_level->kind == sk_class)
12186 pop_nested_class ();
12188 poplevel (0, 0, 0);
12191 poplevel (1, 0, 1);
12193 /* Statements should always be full-expressions at the outermost set
12194 of curly braces for a function. */
12195 gcc_assert (stmts_are_full_exprs_p ());
12197 /* Set up the named return value optimization, if we can. Candidate
12198 variables are selected in check_return_expr. */
12199 if (current_function_return_value)
12201 tree r = current_function_return_value;
12204 if (r != error_mark_node
12205 /* This is only worth doing for fns that return in memory--and
12206 simpler, since we don't have to worry about promoted modes. */
12207 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12208 /* Only allow this for variables declared in the outer scope of
12209 the function so we know that their lifetime always ends with a
12210 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12211 we were to do this optimization in tree-ssa. */
12212 && (outer = outer_curly_brace_block (fndecl))
12213 && chain_member (r, BLOCK_VARS (outer)))
12214 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12216 current_function_return_value = NULL_TREE;
12219 /* Remember that we were in class scope. */
12220 if (current_class_name)
12221 ctype = current_class_type;
12223 /* Must mark the RESULT_DECL as being in this function. */
12224 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12226 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12227 to the FUNCTION_DECL node itself. */
12228 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12230 /* Save away current state, if appropriate. */
12231 if (!processing_template_decl)
12232 save_function_data (fndecl);
12234 /* Complain if there's just no return statement. */
12235 if (warn_return_type
12236 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12237 && !dependent_type_p (TREE_TYPE (fntype))
12238 && !current_function_returns_value && !current_function_returns_null
12239 /* Don't complain if we abort or throw. */
12240 && !current_function_returns_abnormally
12241 && !DECL_NAME (DECL_RESULT (fndecl))
12242 && !TREE_NO_WARNING (fndecl)
12243 /* Structor return values (if any) are set by the compiler. */
12244 && !DECL_CONSTRUCTOR_P (fndecl)
12245 && !DECL_DESTRUCTOR_P (fndecl))
12247 warning (OPT_Wreturn_type,
12248 "no return statement in function returning non-void");
12249 TREE_NO_WARNING (fndecl) = 1;
12252 /* Store the end of the function, so that we get good line number
12253 info for the epilogue. */
12254 cfun->function_end_locus = input_location;
12256 /* Genericize before inlining. */
12257 if (!processing_template_decl)
12259 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12260 cp_genericize (fndecl);
12261 /* Clear out the bits we don't need. */
12262 f->x_current_class_ptr = NULL;
12263 f->x_current_class_ref = NULL;
12264 f->x_eh_spec_block = NULL;
12265 f->x_in_charge_parm = NULL;
12266 f->x_vtt_parm = NULL;
12267 f->x_return_value = NULL;
12268 f->bindings = NULL;
12269 f->extern_decl_map = NULL;
12271 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12272 c_warn_unused_result (gimple_body (fndecl));
12274 /* Clear out the bits we don't need. */
12275 local_names = NULL;
12277 /* We're leaving the context of this function, so zap cfun. It's still in
12278 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12280 current_function_decl = NULL;
12282 /* If this is an in-class inline definition, we may have to pop the
12283 bindings for the template parameters that we added in
12284 maybe_begin_member_template_processing when start_function was
12286 if (inclass_inline)
12287 maybe_end_member_template_processing ();
12289 /* Leave the scope of the class. */
12291 pop_nested_class ();
12297 /* Let the error reporting routines know that we're outside a
12298 function. For a nested function, this value is used in
12299 cxx_pop_function_context and then reset via pop_function_context. */
12300 current_function_decl = NULL_TREE;
12302 defer_mark_used_calls = false;
12303 if (deferred_mark_used_calls)
12308 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12310 VEC_free (tree, gc, deferred_mark_used_calls);
12316 /* Create the FUNCTION_DECL for a function definition.
12317 DECLSPECS and DECLARATOR are the parts of the declaration;
12318 they describe the return type and the name of the function,
12319 but twisted together in a fashion that parallels the syntax of C.
12321 This function creates a binding context for the function body
12322 as well as setting up the FUNCTION_DECL in current_function_decl.
12324 Returns a FUNCTION_DECL on success.
12326 If the DECLARATOR is not suitable for a function (it defines a datum
12327 instead), we return 0, which tells yyparse to report a parse error.
12329 May return void_type_node indicating that this method is actually
12330 a friend. See grokfield for more details.
12332 Came here with a `.pushlevel' .
12334 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12335 CHANGES TO CODE IN `grokfield'. */
12338 start_method (cp_decl_specifier_seq *declspecs,
12339 const cp_declarator *declarator, tree attrlist)
12341 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12344 if (fndecl == error_mark_node)
12345 return error_mark_node;
12347 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12349 error ("invalid member function declaration");
12350 return error_mark_node;
12354 cplus_decl_attributes (&fndecl, attrlist, 0);
12356 /* Pass friends other than inline friend functions back. */
12357 if (fndecl == void_type_node)
12360 if (DECL_IN_AGGR_P (fndecl))
12362 if (DECL_CONTEXT (fndecl)
12363 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12364 error ("%qD is already defined in class %qT", fndecl,
12365 DECL_CONTEXT (fndecl));
12366 return error_mark_node;
12369 check_template_shadow (fndecl);
12371 DECL_DECLARED_INLINE_P (fndecl) = 1;
12372 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12374 /* We process method specializations in finish_struct_1. */
12375 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12377 fndecl = push_template_decl (fndecl);
12378 if (fndecl == error_mark_node)
12382 if (! DECL_FRIEND_P (fndecl))
12384 if (TREE_CHAIN (fndecl))
12386 fndecl = copy_node (fndecl);
12387 TREE_CHAIN (fndecl) = NULL_TREE;
12391 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12393 /* Make a place for the parms. */
12394 begin_scope (sk_function_parms, fndecl);
12396 DECL_IN_AGGR_P (fndecl) = 1;
12400 /* Go through the motions of finishing a function definition.
12401 We don't compile this method until after the whole class has
12404 FINISH_METHOD must return something that looks as though it
12405 came from GROKFIELD (since we are defining a method, after all).
12407 This is called after parsing the body of the function definition.
12408 STMTS is the chain of statements that makes up the function body.
12410 DECL is the ..._DECL that `start_method' provided. */
12413 finish_method (tree decl)
12415 tree fndecl = decl;
12420 if (decl == void_type_node)
12423 old_initial = DECL_INITIAL (fndecl);
12425 /* Undo the level for the parms (from start_method).
12426 This is like poplevel, but it causes nothing to be
12427 saved. Saving information here confuses symbol-table
12428 output routines. Besides, this information will
12429 be correctly output when this method is actually
12432 /* Clear out the meanings of the local variables of this level;
12433 also record in each decl which block it belongs to. */
12435 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12437 if (DECL_NAME (link) != NULL_TREE)
12438 pop_binding (DECL_NAME (link), link);
12439 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12440 DECL_CONTEXT (link) = NULL_TREE;
12443 poplevel (0, 0, 0);
12445 DECL_INITIAL (fndecl) = old_initial;
12447 /* We used to check if the context of FNDECL was different from
12448 current_class_type as another way to get inside here. This didn't work
12449 for String.cc in libg++. */
12450 if (DECL_FRIEND_P (fndecl))
12452 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12454 decl = void_type_node;
12461 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12462 we can lay it out later, when and if its type becomes complete. */
12465 maybe_register_incomplete_var (tree var)
12467 gcc_assert (TREE_CODE (var) == VAR_DECL);
12469 /* Keep track of variables with incomplete types. */
12470 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12471 && DECL_EXTERNAL (var))
12473 tree inner_type = TREE_TYPE (var);
12475 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12476 inner_type = TREE_TYPE (inner_type);
12477 inner_type = TYPE_MAIN_VARIANT (inner_type);
12479 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12480 /* RTTI TD entries are created while defining the type_info. */
12481 || (TYPE_LANG_SPECIFIC (inner_type)
12482 && TYPE_BEING_DEFINED (inner_type)))
12483 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12487 /* Called when a class type (given by TYPE) is defined. If there are
12488 any existing VAR_DECLs whose type has been completed by this
12489 declaration, update them now. */
12492 complete_vars (tree type)
12494 tree *list = &incomplete_vars;
12496 gcc_assert (CLASS_TYPE_P (type));
12499 if (same_type_p (type, TREE_PURPOSE (*list)))
12501 tree var = TREE_VALUE (*list);
12502 tree type = TREE_TYPE (var);
12503 /* Complete the type of the variable. The VAR_DECL itself
12504 will be laid out in expand_expr. */
12505 complete_type (type);
12506 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12507 /* Remove this entry from the list. */
12508 *list = TREE_CHAIN (*list);
12511 list = &TREE_CHAIN (*list);
12514 /* Check for pending declarations which may have abstract type. */
12515 complete_type_check_abstract (type);
12518 /* If DECL is of a type which needs a cleanup, build and return an
12519 expression to perform that cleanup here. Return NULL_TREE if no
12520 cleanup need be done. */
12523 cxx_maybe_build_cleanup (tree decl)
12529 /* Assume no cleanup is required. */
12530 cleanup = NULL_TREE;
12532 if (error_operand_p (decl))
12535 /* Handle "__attribute__((cleanup))". We run the cleanup function
12536 before the destructor since the destructor is what actually
12537 terminates the lifetime of the object. */
12538 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12545 /* Get the name specified by the user for the cleanup function. */
12546 id = TREE_VALUE (TREE_VALUE (attr));
12547 /* Look up the name to find the cleanup function to call. It is
12548 important to use lookup_name here because that is what is
12549 used in c-common.c:handle_cleanup_attribute when performing
12550 initial checks on the attribute. Note that those checks
12551 include ensuring that the function found is not an overloaded
12552 function, or an object with an overloaded call operator,
12553 etc.; we can rely on the fact that the function found is an
12554 ordinary FUNCTION_DECL. */
12555 fn = lookup_name (id);
12556 arg = build_address (decl);
12558 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12560 tf_warning_or_error);
12562 /* Handle ordinary C++ destructors. */
12563 type = TREE_TYPE (decl);
12564 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12566 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12567 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12568 && CLASSTYPE_VBASECLASSES (type));
12572 if (TREE_CODE (type) == ARRAY_TYPE)
12575 addr = build_address (decl);
12577 /* Optimize for space over speed here. */
12578 if (!has_vbases || flag_expensive_optimizations)
12579 flags |= LOOKUP_NONVIRTUAL;
12581 call = build_delete (TREE_TYPE (addr), addr,
12582 sfk_complete_destructor, flags, 0);
12584 cleanup = build_compound_expr (cleanup, call);
12592 /* When a stmt has been parsed, this function is called. */
12599 /* DECL was originally constructed as a non-static member function,
12600 but turned out to be static. Update it accordingly. */
12603 revert_static_member_fn (tree decl)
12606 tree function = TREE_TYPE (decl);
12607 tree args = TYPE_ARG_TYPES (function);
12609 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12610 != TYPE_UNQUALIFIED)
12611 error ("static member function %q#D declared with type qualifiers", decl);
12613 args = TREE_CHAIN (args);
12614 tmp = build_function_type (TREE_TYPE (function), args);
12615 tmp = build_qualified_type (tmp, cp_type_quals (function));
12616 tmp = build_exception_variant (tmp,
12617 TYPE_RAISES_EXCEPTIONS (function));
12618 TREE_TYPE (decl) = tmp;
12619 if (DECL_ARGUMENTS (decl))
12620 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12621 DECL_STATIC_FUNCTION_P (decl) = 1;
12624 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12625 one of the language-independent trees. */
12627 enum cp_tree_node_structure_enum
12628 cp_tree_node_structure (union lang_tree_node * t)
12630 switch (TREE_CODE (&t->generic))
12632 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12633 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12634 case OVERLOAD: return TS_CP_OVERLOAD;
12635 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12636 case PTRMEM_CST: return TS_CP_PTRMEM;
12637 case BASELINK: return TS_CP_BASELINK;
12638 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12639 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12640 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12641 default: return TS_CP_GENERIC;
12645 /* Build the void_list_node (void_type_node having been created). */
12647 build_void_list_node (void)
12649 tree t = build_tree_list (NULL_TREE, void_type_node);
12654 cp_missing_noreturn_ok_p (tree decl)
12656 /* A missing noreturn is ok for the `main' function. */
12657 return DECL_MAIN_P (decl);
12660 /* Return the COMDAT group into which DECL should be placed. */
12663 cxx_comdat_group (tree decl)
12667 /* Virtual tables, construction virtual tables, and virtual table
12668 tables all go in a single COMDAT group, named after the primary
12670 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12671 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12672 /* For all other DECLs, the COMDAT group is the mangled name of the
12673 declaration itself. */
12676 while (DECL_THUNK_P (decl))
12678 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12679 into the same section as the target function. In that case
12680 we must return target's name. */
12681 tree target = THUNK_TARGET (decl);
12682 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12683 && DECL_SECTION_NAME (target) != NULL
12684 && DECL_ONE_ONLY (target))
12689 name = DECL_ASSEMBLER_NAME (decl);
12692 return IDENTIFIER_POINTER (name);
12695 #include "gt-cp-decl.h"