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);
5491 if (auto_node && !type_dependent_expression_p (init))
5493 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5494 if (type == error_mark_node)
5498 if (processing_template_decl)
5500 bool type_dependent_p;
5502 /* Add this declaration to the statement-tree. */
5503 if (at_function_scope_p ())
5504 add_decl_expr (decl);
5506 type_dependent_p = dependent_type_p (type);
5508 if (check_for_bare_parameter_packs (init))
5511 DECL_INITIAL (decl) = NULL_TREE;
5514 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5516 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5517 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5518 TREE_CONSTANT (decl) = 1;
5521 /* Generally, initializers in templates are expanded when the
5522 template is instantiated. But, if DECL is an integral
5523 constant static data member, then it can be used in future
5524 integral constant expressions, and its value must be
5527 && DECL_CLASS_SCOPE_P (decl)
5528 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5529 && !type_dependent_p
5530 && !value_dependent_init_p (init)))
5533 DECL_INITIAL (decl) = init;
5534 if (TREE_CODE (decl) == VAR_DECL
5535 && !DECL_PRETTY_FUNCTION_P (decl)
5536 && !type_dependent_p)
5537 maybe_deduce_size_from_array_init (decl, init);
5541 if (TREE_CODE (init) == TREE_LIST)
5543 /* If the parenthesized-initializer form was used (e.g.,
5544 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5545 arguments. (There is generally only one.) We convert them
5548 for (; list; list = TREE_CHAIN (list))
5550 tree elt = TREE_VALUE (list);
5551 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5555 init = fold_non_dependent_expr (init);
5556 processing_template_decl = 0;
5559 /* Take care of TYPE_DECLs up front. */
5560 if (TREE_CODE (decl) == TYPE_DECL)
5562 if (type != error_mark_node
5563 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5565 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5566 warning (0, "shadowing previous type declaration of %q#D", decl);
5567 set_identifier_type_value (DECL_NAME (decl), decl);
5570 /* If we have installed this as the canonical typedef for this
5571 type, and that type has not been defined yet, delay emitting
5572 the debug information for it, as we will emit it later. */
5573 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5574 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5575 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5577 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5582 /* A reference will be modified here, as it is initialized. */
5583 if (! DECL_EXTERNAL (decl)
5584 && TREE_READONLY (decl)
5585 && TREE_CODE (type) == REFERENCE_TYPE)
5588 TREE_READONLY (decl) = 0;
5591 if (TREE_CODE (decl) == VAR_DECL)
5593 /* Only PODs can have thread-local storage. Other types may require
5594 various kinds of non-trivial initialization. */
5595 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5596 error ("%qD cannot be thread-local because it has non-POD type %qT",
5597 decl, TREE_TYPE (decl));
5598 /* If this is a local variable that will need a mangled name,
5599 register it now. We must do this before processing the
5600 initializer for the variable, since the initialization might
5601 require a guard variable, and since the mangled name of the
5602 guard variable will depend on the mangled name of this
5604 if (DECL_FUNCTION_SCOPE_P (decl)
5605 && TREE_STATIC (decl)
5606 && !DECL_ARTIFICIAL (decl))
5607 push_local_name (decl);
5608 /* Convert the initializer to the type of DECL, if we have not
5609 already initialized DECL. */
5610 if (!DECL_INITIALIZED_P (decl)
5611 /* If !DECL_EXTERNAL then DECL is being defined. In the
5612 case of a static data member initialized inside the
5613 class-specifier, there can be an initializer even if DECL
5614 is *not* defined. */
5615 && (!DECL_EXTERNAL (decl) || init))
5617 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5620 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5621 /* Allow libjava/prims.cc define primitive classes. */
5622 if (init != NULL_TREE
5623 || jclass == NULL_TREE
5624 || TREE_CODE (jclass) != TYPE_DECL
5625 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5626 || !same_type_ignoring_top_level_qualifiers_p
5627 (type, TREE_TYPE (TREE_TYPE (jclass))))
5628 error ("Java object %qD not allocated with %<new%>", decl);
5633 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5634 if (init_const_expr_p)
5636 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5637 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5638 TREE_CONSTANT (decl) = 1;
5641 init = check_initializer (decl, init, flags, &cleanup);
5642 /* Thread-local storage cannot be dynamically initialized. */
5643 if (DECL_THREAD_LOCAL_P (decl) && init)
5645 error ("%qD is thread-local and so cannot be dynamically "
5646 "initialized", decl);
5650 /* Check that the initializer for a static data member was a
5651 constant. Although we check in the parser that the
5652 initializer is an integral constant expression, we do not
5653 simplify division-by-zero at the point at which it
5654 occurs. Therefore, in:
5656 struct S { static const int i = 7 / 0; };
5658 we issue an error at this point. It would
5659 probably be better to forbid division by zero in
5660 integral constant expressions. */
5661 if (DECL_EXTERNAL (decl) && init)
5663 error ("%qD cannot be initialized by a non-constant expression"
5664 " when being declared", decl);
5665 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5673 The memory occupied by any object of static storage
5674 duration is zero-initialized at program startup before
5675 any other initialization takes place.
5677 We cannot create an appropriate initializer until after
5678 the type of DECL is finalized. If DECL_INITIAL is set,
5679 then the DECL is statically initialized, and any
5680 necessary zero-initialization has already been performed. */
5681 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5682 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5683 /*nelts=*/NULL_TREE,
5684 /*static_storage_p=*/true);
5685 /* Remember that the initialization for this variable has
5687 DECL_INITIALIZED_P (decl) = 1;
5688 /* This declaration is the definition of this variable,
5689 unless we are initializing a static data member within
5690 the class specifier. */
5691 if (!DECL_EXTERNAL (decl))
5692 var_definition_p = true;
5694 /* If the variable has an array type, lay out the type, even if
5695 there is no initializer. It is valid to index through the
5696 array, and we must get TYPE_ALIGN set correctly on the array
5698 else if (TREE_CODE (type) == ARRAY_TYPE)
5701 else if (TREE_CODE (decl) == FIELD_DECL
5702 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5703 error ("non-static data member %qD has Java class type", decl);
5705 /* Add this declaration to the statement-tree. This needs to happen
5706 after the call to check_initializer so that the DECL_EXPR for a
5707 reference temp is added before the DECL_EXPR for the reference itself. */
5708 if (at_function_scope_p ())
5709 add_decl_expr (decl);
5711 /* Let the middle end know about variables and functions -- but not
5712 static data members in uninstantiated class templates. */
5713 if (!saved_processing_template_decl
5714 && (TREE_CODE (decl) == VAR_DECL
5715 || TREE_CODE (decl) == FUNCTION_DECL))
5717 if (TREE_CODE (decl) == VAR_DECL)
5719 layout_var_decl (decl);
5720 maybe_commonize_var (decl);
5723 /* This needs to happen after the linkage is set. */
5724 determine_visibility (decl);
5726 if (var_definition_p && TREE_STATIC (decl))
5728 /* If a TREE_READONLY variable needs initialization
5729 at runtime, it is no longer readonly and we need to
5730 avoid MEM_READONLY_P being set on RTL created for it. */
5733 if (TREE_READONLY (decl))
5734 TREE_READONLY (decl) = 0;
5737 else if (was_readonly)
5738 TREE_READONLY (decl) = 1;
5741 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5743 /* Check for abstractness of the type. Notice that there is no
5744 need to strip array types here since the check for those types
5745 is already done within create_array_type_for_decl. */
5746 if (TREE_CODE (type) == FUNCTION_TYPE
5747 || TREE_CODE (type) == METHOD_TYPE)
5748 abstract_virtuals_error (decl, TREE_TYPE (type));
5750 abstract_virtuals_error (decl, type);
5752 if (TREE_TYPE (decl) == error_mark_node)
5753 /* No initialization required. */
5755 else if (TREE_CODE (decl) == FUNCTION_DECL)
5759 if (init == ridpointers[(int)RID_DELETE])
5761 /* fixme check this is 1st decl */
5762 DECL_DELETED_FN (decl) = 1;
5763 DECL_DECLARED_INLINE_P (decl) = 1;
5764 DECL_INITIAL (decl) = error_mark_node;
5766 else if (init == ridpointers[(int)RID_DEFAULT])
5768 if (!defaultable_fn_p (decl))
5769 error ("%qD cannot be defaulted", decl);
5772 /* An out-of-class default definition is defined at
5773 the point where it is explicitly defaulted. */
5774 DECL_DEFAULTED_FN (decl) = 1;
5775 if (DECL_INITIAL (decl) == error_mark_node)
5776 synthesize_method (decl);
5780 error ("function %q#D is initialized like a variable", decl);
5782 /* else no initialization required. */
5784 else if (DECL_EXTERNAL (decl)
5785 && ! (DECL_LANG_SPECIFIC (decl)
5786 && DECL_NOT_REALLY_EXTERN (decl)))
5789 DECL_INITIAL (decl) = init;
5791 /* A variable definition. */
5792 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5793 /* Initialize the local variable. */
5794 initialize_local_var (decl, init);
5796 /* If a variable is defined, and then a subsequent
5797 definition with external linkage is encountered, we will
5798 get here twice for the same variable. We want to avoid
5799 calling expand_static_init more than once. For variables
5800 that are not static data members, we can call
5801 expand_static_init only when we actually process the
5802 initializer. It is not legal to redeclare a static data
5803 member, so this issue does not arise in that case. */
5804 else if (var_definition_p && TREE_STATIC (decl))
5805 expand_static_init (decl, init);
5808 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5809 reference, insert it in the statement-tree now. */
5811 push_cleanup (decl, cleanup, false);
5814 processing_template_decl = saved_processing_template_decl;
5817 TREE_READONLY (decl) = 1;
5819 /* If this was marked 'used', be sure it will be output. */
5820 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5821 mark_decl_referenced (decl);
5824 /* This is here for a midend callback from c-common.c. */
5827 finish_decl (tree decl, tree init, tree asmspec_tree)
5829 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5832 /* Returns a declaration for a VAR_DECL as if:
5834 extern "C" TYPE NAME;
5836 had been seen. Used to create compiler-generated global
5840 declare_global_var (tree name, tree type)
5844 push_to_top_level ();
5845 decl = build_decl (VAR_DECL, name, type);
5846 TREE_PUBLIC (decl) = 1;
5847 DECL_EXTERNAL (decl) = 1;
5848 DECL_ARTIFICIAL (decl) = 1;
5849 /* If the user has explicitly declared this variable (perhaps
5850 because the code we are compiling is part of a low-level runtime
5851 library), then it is possible that our declaration will be merged
5852 with theirs by pushdecl. */
5853 decl = pushdecl (decl);
5854 finish_decl (decl, NULL_TREE, NULL_TREE);
5855 pop_from_top_level ();
5860 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5861 if "__cxa_atexit" is not being used) corresponding to the function
5862 to be called when the program exits. */
5865 get_atexit_fn_ptr_type (void)
5870 if (!atexit_fn_ptr_type_node)
5872 if (flag_use_cxa_atexit
5873 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5874 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5875 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5877 /* The parameter to "atexit" is "void (*)(void)". */
5878 arg_types = void_list_node;
5880 fn_type = build_function_type (void_type_node, arg_types);
5881 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5884 return atexit_fn_ptr_type_node;
5887 /* Returns a pointer to the `atexit' function. Note that if
5888 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5889 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5892 get_atexit_node (void)
5899 bool use_aeabi_atexit;
5904 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5906 /* The declaration for `__cxa_atexit' is:
5908 int __cxa_atexit (void (*)(void *), void *, void *)
5910 We build up the argument types and then then function type
5913 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5914 /* First, build the pointer-to-function type for the first
5916 fn_ptr_type = get_atexit_fn_ptr_type ();
5917 /* Then, build the rest of the argument types. */
5918 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5919 if (use_aeabi_atexit)
5921 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5922 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5926 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5927 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5929 /* And the final __cxa_atexit type. */
5930 fn_type = build_function_type (integer_type_node, arg_types);
5931 fn_ptr_type = build_pointer_type (fn_type);
5932 if (use_aeabi_atexit)
5933 name = "__aeabi_atexit";
5935 name = "__cxa_atexit";
5939 /* The declaration for `atexit' is:
5941 int atexit (void (*)());
5943 We build up the argument types and then then function type
5945 fn_ptr_type = get_atexit_fn_ptr_type ();
5946 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5947 /* Build the final atexit type. */
5948 fn_type = build_function_type (integer_type_node, arg_types);
5952 /* Now, build the function declaration. */
5953 push_lang_context (lang_name_c);
5954 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5955 mark_used (atexit_fndecl);
5956 pop_lang_context ();
5957 atexit_node = decay_conversion (atexit_fndecl);
5962 /* Returns the __dso_handle VAR_DECL. */
5965 get_dso_handle_node (void)
5967 if (dso_handle_node)
5968 return dso_handle_node;
5970 /* Declare the variable. */
5971 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5974 return dso_handle_node;
5977 /* Begin a new function with internal linkage whose job will be simply
5978 to destroy some particular variable. */
5980 static GTY(()) int start_cleanup_cnt;
5983 start_cleanup_fn (void)
5988 bool use_cxa_atexit = flag_use_cxa_atexit
5989 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5991 push_to_top_level ();
5993 /* No need to mangle this. */
5994 push_lang_context (lang_name_c);
5996 /* Build the name of the function. */
5997 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5998 /* Build the function declaration. */
5999 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6000 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6001 /* It's a function with internal linkage, generated by the
6003 TREE_PUBLIC (fndecl) = 0;
6004 DECL_ARTIFICIAL (fndecl) = 1;
6005 /* Make the function `inline' so that it is only emitted if it is
6006 actually needed. It is unlikely that it will be inlined, since
6007 it is only called via a function pointer, but we avoid unnecessary
6008 emissions this way. */
6009 DECL_DECLARED_INLINE_P (fndecl) = 1;
6010 DECL_INTERFACE_KNOWN (fndecl) = 1;
6011 /* Build the parameter. */
6016 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6017 DECL_CONTEXT (parmdecl) = fndecl;
6018 TREE_USED (parmdecl) = 1;
6019 DECL_ARGUMENTS (fndecl) = parmdecl;
6023 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6025 pop_lang_context ();
6027 return current_function_decl;
6030 /* Finish the cleanup function begun by start_cleanup_fn. */
6033 end_cleanup_fn (void)
6035 expand_or_defer_fn (finish_function (0));
6037 pop_from_top_level ();
6040 /* Generate code to handle the destruction of DECL, an object with
6041 static storage duration. */
6044 register_dtor_fn (tree decl)
6053 type = TREE_TYPE (decl);
6054 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6055 return void_zero_node;
6057 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6058 a class object, we can just pass the destructor to
6059 "__cxa_atexit"; we don't have to build a temporary function to do
6061 use_dtor = (flag_use_cxa_atexit
6062 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6063 && CLASS_TYPE_P (type));
6068 /* Find the destructor. */
6069 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6070 gcc_assert (idx >= 0);
6071 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6072 /* Make sure it is accessible. */
6073 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6077 /* Call build_cleanup before we enter the anonymous function so
6078 that any access checks will be done relative to the current
6079 scope, rather than the scope of the anonymous function. */
6080 build_cleanup (decl);
6082 /* Now start the function. */
6083 cleanup = start_cleanup_fn ();
6085 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6086 to the original function, rather than the anonymous one. That
6087 will make the back end think that nested functions are in use,
6088 which causes confusion. */
6089 push_deferring_access_checks (dk_no_check);
6090 fcall = build_cleanup (decl);
6091 pop_deferring_access_checks ();
6093 /* Create the body of the anonymous function. */
6094 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6095 finish_expr_stmt (fcall);
6096 finish_compound_stmt (compound_stmt);
6100 /* Call atexit with the cleanup function. */
6101 mark_used (cleanup);
6102 cleanup = build_address (cleanup);
6103 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6109 /* We must convert CLEANUP to the type that "__cxa_atexit"
6111 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6112 /* "__cxa_atexit" will pass the address of DECL to the
6113 cleanup function. */
6115 addr = build_address (decl);
6116 /* The declared type of the parameter to "__cxa_atexit" is
6117 "void *". For plain "T*", we could just let the
6118 machinery in cp_build_function_call convert it -- but if the
6119 type is "cv-qualified T *", then we need to convert it
6120 before passing it in, to avoid spurious errors. */
6121 addr = build_nop (ptr_type_node, addr);
6124 /* Since the cleanup functions we build ignore the address
6125 they're given, there's no reason to pass the actual address
6126 in, and, in general, it's cheaper to pass NULL than any
6128 addr = null_pointer_node;
6129 args = tree_cons (NULL_TREE,
6130 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6131 tf_warning_or_error),
6133 if (targetm.cxx.use_aeabi_atexit ())
6135 args = tree_cons (NULL_TREE, cleanup, args);
6136 args = tree_cons (NULL_TREE, addr, args);
6140 args = tree_cons (NULL_TREE, addr, args);
6141 args = tree_cons (NULL_TREE, cleanup, args);
6145 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6146 return cp_build_function_call (get_atexit_node (), args,
6147 tf_warning_or_error);
6150 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6151 is its initializer. Generate code to handle the construction
6152 and destruction of DECL. */
6155 expand_static_init (tree decl, tree init)
6157 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6158 gcc_assert (TREE_STATIC (decl));
6160 /* Some variables require no initialization. */
6162 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6163 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6166 if (DECL_FUNCTION_SCOPE_P (decl))
6168 /* Emit code to perform this initialization but once. */
6169 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6170 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6171 tree guard, guard_addr;
6172 tree acquire_fn, release_fn, abort_fn;
6175 /* Emit code to perform this initialization but once. This code
6178 static <type> guard;
6179 if (!guard.first_byte) {
6180 if (__cxa_guard_acquire (&guard)) {
6183 // Do initialization.
6184 flag = true; __cxa_guard_release (&guard);
6185 // Register variable for destruction at end of program.
6187 if (!flag) __cxa_guard_abort (&guard);
6191 Note that the `flag' variable is only set to 1 *after* the
6192 initialization is complete. This ensures that an exception,
6193 thrown during the construction, will cause the variable to
6194 reinitialized when we pass through this code again, as per:
6198 If the initialization exits by throwing an exception, the
6199 initialization is not complete, so it will be tried again
6200 the next time control enters the declaration.
6202 This process should be thread-safe, too; multiple threads
6203 should not be able to initialize the variable more than
6206 /* Create the guard variable. */
6207 guard = get_guard (decl);
6209 /* This optimization isn't safe on targets with relaxed memory
6210 consistency. On such targets we force synchronization in
6211 __cxa_guard_acquire. */
6212 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6214 /* Begin the conditional initialization. */
6215 if_stmt = begin_if_stmt ();
6216 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6217 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6220 if (flag_threadsafe_statics)
6222 guard_addr = build_address (guard);
6224 acquire_fn = get_identifier ("__cxa_guard_acquire");
6225 release_fn = get_identifier ("__cxa_guard_release");
6226 abort_fn = get_identifier ("__cxa_guard_abort");
6227 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6229 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6231 tree vfntype = build_function_type (void_type_node, argtypes);
6232 acquire_fn = push_library_fn
6233 (acquire_fn, build_function_type (integer_type_node, argtypes),
6235 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6236 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6240 release_fn = identifier_global_value (release_fn);
6241 abort_fn = identifier_global_value (abort_fn);
6244 inner_if_stmt = begin_if_stmt ();
6245 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6248 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6249 begin = get_target_expr (boolean_false_node);
6250 flag = TARGET_EXPR_SLOT (begin);
6252 TARGET_EXPR_CLEANUP (begin)
6253 = build3 (COND_EXPR, void_type_node, flag,
6255 build_call_n (abort_fn, 1, guard_addr));
6256 CLEANUP_EH_ONLY (begin) = 1;
6258 /* Do the initialization itself. */
6259 init = add_stmt_to_compound (begin, init);
6260 init = add_stmt_to_compound
6261 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6262 init = add_stmt_to_compound
6263 (init, build_call_n (release_fn, 1, guard_addr));
6266 init = add_stmt_to_compound (init, set_guard (guard));
6268 /* Use atexit to register a function for destroying this static
6270 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6272 finish_expr_stmt (init);
6274 if (flag_threadsafe_statics)
6276 finish_compound_stmt (inner_then_clause);
6277 finish_then_clause (inner_if_stmt);
6278 finish_if_stmt (inner_if_stmt);
6281 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6283 finish_compound_stmt (then_clause);
6284 finish_then_clause (if_stmt);
6285 finish_if_stmt (if_stmt);
6289 static_aggregates = tree_cons (init, decl, static_aggregates);
6293 /* Make TYPE a complete type based on INITIAL_VALUE.
6294 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6295 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6296 3 if the initializer list is empty (in pedantic mode). */
6299 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6302 tree type, elt_type;
6306 unsigned HOST_WIDE_INT i;
6309 /* An array of character type can be initialized from a
6310 brace-enclosed string constant.
6312 FIXME: this code is duplicated from reshape_init. Probably
6313 we should just call reshape_init here? */
6314 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6315 && TREE_CODE (initial_value) == CONSTRUCTOR
6316 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6318 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6319 tree value = VEC_index (constructor_elt, v, 0)->value;
6321 if (TREE_CODE (value) == STRING_CST
6322 && VEC_length (constructor_elt, v) == 1)
6323 initial_value = value;
6326 /* If any of the elements are parameter packs, we can't actually
6327 complete this type now because the array size is dependent. */
6328 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6330 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6333 if (PACK_EXPANSION_P (value))
6339 failure = complete_array_type (ptype, initial_value, do_default);
6341 /* We can create the array before the element type is complete, which
6342 means that we didn't have these two bits set in the original type
6343 either. In completing the type, we are expected to propagate these
6344 bits. See also complete_type which does the same thing for arrays
6347 if (TYPE_DOMAIN (type))
6349 elt_type = TREE_TYPE (type);
6350 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6351 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6352 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6358 /* Return zero if something is declared to be a member of type
6359 CTYPE when in the context of CUR_TYPE. STRING is the error
6360 message to print in that case. Otherwise, quietly return 1. */
6363 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6365 if (ctype && ctype != cur_type)
6367 if (flags == DTOR_FLAG)
6368 error ("destructor for alien class %qT cannot be a member", ctype);
6370 error ("constructor for alien class %qT cannot be a member", ctype);
6376 /* Subroutine of `grokdeclarator'. */
6378 /* Generate errors possibly applicable for a given set of specifiers.
6379 This is for ARM $7.1.2. */
6382 bad_specifiers (tree object,
6391 error ("%qD declared as a %<virtual%> %s", object, type);
6393 error ("%qD declared as an %<inline%> %s", object, type);
6395 error ("%<const%> and %<volatile%> function specifiers on "
6396 "%qD invalid in %s declaration",
6399 error ("%q+D declared as a friend", object);
6401 && (TREE_CODE (object) == TYPE_DECL
6402 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6403 && !TYPE_REFFN_P (TREE_TYPE (object))
6404 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6405 error ("%q+D declared with an exception specification", object);
6408 /* DECL is a member function or static data member and is presently
6409 being defined. Check that the definition is taking place in a
6413 check_class_member_definition_namespace (tree decl)
6415 /* These checks only apply to member functions and static data
6417 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6418 || TREE_CODE (decl) == VAR_DECL);
6419 /* We check for problems with specializations in pt.c in
6420 check_specialization_namespace, where we can issue better
6422 if (processing_specialization)
6424 /* There are no restrictions on the placement of
6425 explicit instantiations. */
6426 if (processing_explicit_instantiation)
6430 A member function definition that appears outside of the
6431 class definition shall appear in a namespace scope enclosing
6432 the class definition.
6436 The definition for a static data member shall appear in a
6437 namespace scope enclosing the member's class definition. */
6438 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6439 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6440 decl, DECL_CONTEXT (decl));
6443 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6444 METHOD_TYPE for a non-static member function; QUALS are the
6445 cv-qualifiers that apply to the function. */
6448 build_this_parm (tree type, cp_cv_quals quals)
6453 cp_cv_quals this_quals;
6455 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6456 /* The `this' parameter is implicitly `const'; it cannot be
6458 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6459 qual_type = cp_build_qualified_type (this_type, this_quals);
6460 parm = build_artificial_parm (this_identifier, qual_type);
6461 cp_apply_type_quals_to_decl (this_quals, parm);
6465 /* CTYPE is class type, or null if non-class.
6466 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6468 DECLARATOR is the function's name.
6469 PARMS is a chain of PARM_DECLs for the function.
6470 VIRTUALP is truthvalue of whether the function is virtual or not.
6471 FLAGS are to be passed through to `grokclassfn'.
6472 QUALS are qualifiers indicating whether the function is `const'
6474 RAISES is a list of exceptions that this function can raise.
6475 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6476 not look, and -1 if we should not call `grokclassfn' at all.
6478 SFK is the kind of special function (if any) for the new function.
6480 Returns `NULL_TREE' if something goes wrong, after issuing
6481 applicable error messages. */
6484 grokfndecl (tree ctype,
6488 tree orig_declarator,
6490 enum overload_flags flags,
6497 special_function_kind sfk,
6502 location_t location)
6505 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6509 type = build_exception_variant (type, raises);
6511 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6513 /* If we have an explicit location, use it, otherwise use whatever
6514 build_lang_decl used (probably input_location). */
6515 if (location != UNKNOWN_LOCATION)
6516 DECL_SOURCE_LOCATION (decl) = location;
6518 if (TREE_CODE (type) == METHOD_TYPE)
6521 parm = build_this_parm (type, quals);
6522 TREE_CHAIN (parm) = parms;
6525 DECL_ARGUMENTS (decl) = parms;
6526 /* Propagate volatile out from type to decl. */
6527 if (TYPE_VOLATILE (type))
6528 TREE_THIS_VOLATILE (decl) = 1;
6530 /* Setup decl according to sfk. */
6533 case sfk_constructor:
6534 case sfk_copy_constructor:
6535 DECL_CONSTRUCTOR_P (decl) = 1;
6537 case sfk_destructor:
6538 DECL_DESTRUCTOR_P (decl) = 1;
6544 /* If pointers to member functions use the least significant bit to
6545 indicate whether a function is virtual, ensure a pointer
6546 to this function will have that bit clear. */
6547 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6548 && TREE_CODE (type) == METHOD_TYPE
6549 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6550 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6553 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6557 ("defining explicit specialization %qD in friend declaration",
6561 tree fns = TREE_OPERAND (orig_declarator, 0);
6562 tree args = TREE_OPERAND (orig_declarator, 1);
6564 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6566 /* Something like `template <class T> friend void f<T>()'. */
6567 error ("invalid use of template-id %qD in declaration "
6568 "of primary template",
6574 /* A friend declaration of the form friend void f<>(). Record
6575 the information in the TEMPLATE_ID_EXPR. */
6576 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6578 if (TREE_CODE (fns) == COMPONENT_REF)
6580 /* Due to bison parser ickiness, we will have already looked
6581 up an operator_name or PFUNCNAME within the current class
6582 (see template_id in parse.y). If the current class contains
6583 such a name, we'll get a COMPONENT_REF here. Undo that. */
6585 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6586 == current_class_type);
6587 fns = TREE_OPERAND (fns, 1);
6589 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6590 || TREE_CODE (fns) == OVERLOAD);
6591 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6593 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6594 if (TREE_PURPOSE (t)
6595 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6597 error ("default arguments are not allowed in declaration "
6598 "of friend template specialization %qD",
6605 error ("%<inline%> is not allowed in declaration of friend "
6606 "template specialization %qD",
6613 /* If this decl has namespace scope, set that up. */
6615 set_decl_namespace (decl, in_namespace, friendp);
6617 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6619 /* `main' and builtins have implicit 'C' linkage. */
6620 if ((MAIN_NAME_P (declarator)
6621 || (IDENTIFIER_LENGTH (declarator) > 10
6622 && IDENTIFIER_POINTER (declarator)[0] == '_'
6623 && IDENTIFIER_POINTER (declarator)[1] == '_'
6624 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6625 && current_lang_name == lang_name_cplusplus
6626 && ctype == NULL_TREE
6627 /* NULL_TREE means global namespace. */
6628 && DECL_CONTEXT (decl) == NULL_TREE)
6629 SET_DECL_LANGUAGE (decl, lang_c);
6631 /* Should probably propagate const out from type to decl I bet (mrs). */
6634 DECL_STATIC_FUNCTION_P (decl) = 1;
6635 DECL_CONTEXT (decl) = ctype;
6640 DECL_CONTEXT (decl) = ctype;
6642 check_class_member_definition_namespace (decl);
6645 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6647 if (processing_template_decl)
6648 error ("cannot declare %<::main%> to be a template");
6650 error ("cannot declare %<::main%> to be inline");
6652 error ("cannot declare %<::main%> to be static");
6657 /* Members of anonymous types and local classes have no linkage; make
6658 them internal. If a typedef is made later, this will be changed. */
6659 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6660 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6665 /* [basic.link]: A name with no linkage (notably, the name of a class
6666 or enumeration declared in a local scope) shall not be used to
6667 declare an entity with linkage.
6669 Only check this for public decls for now. See core 319, 389. */
6670 t = no_linkage_check (TREE_TYPE (decl),
6671 /*relaxed_p=*/false);
6674 if (TYPE_ANONYMOUS_P (t))
6676 if (DECL_EXTERN_C_P (decl))
6677 /* Allow this; it's pretty common in C. */;
6680 permerror (input_location, "non-local function %q#D uses anonymous type",
6682 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6683 permerror (input_location, "%q+#D does not refer to the unqualified "
6684 "type, so it is not used for linkage",
6689 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6693 TREE_PUBLIC (decl) = publicp;
6696 DECL_INTERFACE_KNOWN (decl) = 1;
6697 DECL_NOT_REALLY_EXTERN (decl) = 1;
6700 /* If the declaration was declared inline, mark it as such. */
6702 DECL_DECLARED_INLINE_P (decl) = 1;
6704 DECL_EXTERNAL (decl) = 1;
6705 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6708 ? G_("static member function %qD cannot have cv-qualifier")
6709 : G_("non-member function %qD cannot have cv-qualifier"),
6711 quals = TYPE_UNQUALIFIED;
6714 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6715 && !grok_op_properties (decl, /*complain=*/true))
6718 if (ctype && decl_function_context (decl))
6719 DECL_NO_STATIC_CHAIN (decl) = 1;
6722 /* Make the init_value nonzero so pushdecl knows this is not
6723 tentative. error_mark_node is replaced later with the BLOCK. */
6724 DECL_INITIAL (decl) = error_mark_node;
6726 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6727 TREE_NOTHROW (decl) = 1;
6729 /* Caller will do the rest of this. */
6733 if (ctype != NULL_TREE)
6734 grokclassfn (ctype, decl, flags);
6736 decl = check_explicit_specialization (orig_declarator, decl,
6739 4 * (friendp != 0));
6740 if (decl == error_mark_node)
6745 cplus_decl_attributes (&decl, *attrlist, 0);
6746 *attrlist = NULL_TREE;
6749 /* Check main's type after attributes have been applied. */
6750 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6752 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6755 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6757 error ("%<::main%> must return %<int%>");
6758 newtype = build_function_type (integer_type_node, oldtypeargs);
6759 TREE_TYPE (decl) = newtype;
6762 check_main_parameter_types (decl);
6765 if (ctype != NULL_TREE
6766 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6769 tree old_decl = check_classfn (ctype, decl,
6770 (processing_template_decl
6771 > template_class_depth (ctype))
6772 ? current_template_parms
6775 if (old_decl == error_mark_node)
6783 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6784 /* Because grokfndecl is always supposed to return a
6785 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6786 here. We depend on our callers to figure out that its
6787 really a template that's being returned. */
6788 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6790 if (DECL_STATIC_FUNCTION_P (old_decl)
6791 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6792 /* Remove the `this' parm added by grokclassfn.
6793 XXX Isn't this done in start_function, too? */
6794 revert_static_member_fn (decl);
6795 if (DECL_ARTIFICIAL (old_decl))
6797 error ("definition of implicitly-declared %qD", old_decl);
6801 /* Since we've smashed OLD_DECL to its
6802 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6803 if (TREE_CODE (decl) == TEMPLATE_DECL)
6804 decl = DECL_TEMPLATE_RESULT (decl);
6806 /* Attempt to merge the declarations. This can fail, in
6807 the case of some invalid specialization declarations. */
6808 pushed_scope = push_scope (ctype);
6809 ok = duplicate_decls (decl, old_decl, friendp);
6811 pop_scope (pushed_scope);
6814 error ("no %q#D member function declared in class %qT",
6822 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6825 if (ctype == NULL_TREE || check)
6829 DECL_VIRTUAL_P (decl) = 1;
6834 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6835 the linkage that DECL will receive in the object file. */
6838 set_linkage_for_static_data_member (tree decl)
6840 /* A static data member always has static storage duration and
6841 external linkage. Note that static data members are forbidden in
6842 local classes -- the only situation in which a class has
6843 non-external linkage. */
6844 TREE_PUBLIC (decl) = 1;
6845 TREE_STATIC (decl) = 1;
6846 /* For non-template classes, static data members are always put
6847 out in exactly those files where they are defined, just as
6848 with ordinary namespace-scope variables. */
6849 if (!processing_template_decl)
6850 DECL_INTERFACE_KNOWN (decl) = 1;
6853 /* Create a VAR_DECL named NAME with the indicated TYPE.
6855 If SCOPE is non-NULL, it is the class type or namespace containing
6856 the variable. If SCOPE is NULL, the variable should is created in
6857 the innermost enclosings scope. */
6860 grokvardecl (tree type,
6862 const cp_decl_specifier_seq *declspecs,
6868 tree explicit_scope;
6870 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6872 /* Compute the scope in which to place the variable, but remember
6873 whether or not that scope was explicitly specified by the user. */
6874 explicit_scope = scope;
6877 /* An explicit "extern" specifier indicates a namespace-scope
6879 if (declspecs->storage_class == sc_extern)
6880 scope = current_namespace;
6881 else if (!at_function_scope_p ())
6882 scope = current_scope ();
6886 && (/* If the variable is a namespace-scope variable declared in a
6887 template, we need DECL_LANG_SPECIFIC. */
6888 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6889 /* Similarly for namespace-scope variables with language linkage
6891 || (TREE_CODE (scope) == NAMESPACE_DECL
6892 && current_lang_name != lang_name_cplusplus)
6893 /* Similarly for static data members. */
6895 decl = build_lang_decl (VAR_DECL, name, type);
6897 decl = build_decl (VAR_DECL, name, type);
6899 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6900 set_decl_namespace (decl, explicit_scope, 0);
6902 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6904 if (declspecs->storage_class == sc_extern)
6906 DECL_THIS_EXTERN (decl) = 1;
6907 DECL_EXTERNAL (decl) = !initialized;
6910 if (DECL_CLASS_SCOPE_P (decl))
6912 set_linkage_for_static_data_member (decl);
6913 /* This function is only called with out-of-class definitions. */
6914 DECL_EXTERNAL (decl) = 0;
6915 check_class_member_definition_namespace (decl);
6917 /* At top level, either `static' or no s.c. makes a definition
6918 (perhaps tentative), and absence of `static' makes it public. */
6919 else if (toplevel_bindings_p ())
6921 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6922 && (DECL_THIS_EXTERN (decl) || ! constp));
6923 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6925 /* Not at top level, only `static' makes a static definition. */
6928 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6929 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6932 if (declspecs->specs[(int)ds_thread])
6933 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6935 if (TREE_PUBLIC (decl))
6937 /* [basic.link]: A name with no linkage (notably, the name of a class
6938 or enumeration declared in a local scope) shall not be used to
6939 declare an entity with linkage.
6941 Only check this for public decls for now. */
6942 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6945 if (TYPE_ANONYMOUS_P (t))
6947 if (DECL_EXTERN_C_P (decl))
6948 /* Allow this; it's pretty common in C. */
6952 /* DRs 132, 319 and 389 seem to indicate types with
6953 no linkage can only be used to declare extern "C"
6954 entities. Since it's not always an error in the
6955 ISO C++ 90 Standard, we only issue a warning. */
6956 warning (0, "non-local variable %q#D uses anonymous type",
6958 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6959 warning (0, "%q+#D does not refer to the unqualified "
6960 "type, so it is not used for linkage",
6965 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6969 DECL_INTERFACE_KNOWN (decl) = 1;
6974 /* Create and return a canonical pointer to member function type, for
6975 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6978 build_ptrmemfunc_type (tree type)
6982 tree unqualified_variant = NULL_TREE;
6984 if (type == error_mark_node)
6987 /* If a canonical type already exists for this type, use it. We use
6988 this method instead of type_hash_canon, because it only does a
6989 simple equality check on the list of field members. */
6991 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6994 /* Make sure that we always have the unqualified pointer-to-member
6996 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6998 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7000 t = make_class_type (RECORD_TYPE);
7001 xref_basetypes (t, NULL_TREE);
7003 /* Let the front end know this is a pointer to member function... */
7004 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7005 /* ... and not really a class type. */
7006 SET_CLASS_TYPE_P (t, 0);
7008 field = build_decl (FIELD_DECL, pfn_identifier, type);
7011 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
7012 TREE_CHAIN (field) = fields;
7015 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7017 /* Zap out the name so that the back end will give us the debugging
7018 information for this anonymous RECORD_TYPE. */
7019 TYPE_NAME (t) = NULL_TREE;
7021 /* If this is not the unqualified form of this pointer-to-member
7022 type, set the TYPE_MAIN_VARIANT for this type to be the
7023 unqualified type. Since they are actually RECORD_TYPEs that are
7024 not variants of each other, we must do this manually. */
7025 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7027 t = build_qualified_type (t, cp_type_quals (type));
7028 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7029 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7030 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7031 TREE_TYPE (TYPE_BINFO (t)) = t;
7034 /* Cache this pointer-to-member type so that we can find it again
7036 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7038 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7039 SET_TYPE_STRUCTURAL_EQUALITY (t);
7040 else if (TYPE_CANONICAL (type) != type)
7041 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7046 /* Create and return a pointer to data member type. */
7049 build_ptrmem_type (tree class_type, tree member_type)
7051 if (TREE_CODE (member_type) == METHOD_TYPE)
7055 arg_types = TYPE_ARG_TYPES (member_type);
7056 class_type = (cp_build_qualified_type
7058 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7060 = build_method_type_directly (class_type,
7061 TREE_TYPE (member_type),
7062 TREE_CHAIN (arg_types));
7063 return build_ptrmemfunc_type (build_pointer_type (member_type));
7067 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7068 return build_offset_type (class_type, member_type);
7072 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7073 Check to see that the definition is valid. Issue appropriate error
7074 messages. Return 1 if the definition is particularly bad, or 0
7078 check_static_variable_definition (tree decl, tree type)
7080 /* Motion 10 at San Diego: If a static const integral data member is
7081 initialized with an integral constant expression, the initializer
7082 may appear either in the declaration (within the class), or in
7083 the definition, but not both. If it appears in the class, the
7084 member is a member constant. The file-scope definition is always
7086 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7088 error ("invalid in-class initialization of static data member "
7089 "of non-integral type %qT",
7091 /* If we just return the declaration, crashes will sometimes
7092 occur. We therefore return void_type_node, as if this were a
7093 friend declaration, to cause callers to completely ignore
7094 this declaration. */
7097 else if (!CP_TYPE_CONST_P (type))
7098 error ("ISO C++ forbids in-class initialization of non-const "
7099 "static member %qD",
7101 else if (!INTEGRAL_TYPE_P (type))
7102 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7103 "%qD of non-integral type %qT", decl, type);
7108 /* Given the SIZE (i.e., number of elements) in an array, compute an
7109 appropriate index type for the array. If non-NULL, NAME is the
7110 name of the thing being declared. */
7113 compute_array_index_type (tree name, tree size)
7117 tree abi_1_itype = NULL_TREE;
7119 if (error_operand_p (size))
7120 return error_mark_node;
7122 type = TREE_TYPE (size);
7123 /* The array bound must be an integer type. */
7124 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7127 error ("size of array %qD has non-integral type %qT", name, type);
7129 error ("size of array has non-integral type %qT", type);
7130 size = integer_one_node;
7131 type = TREE_TYPE (size);
7134 if (value_dependent_expression_p (size))
7136 /* We cannot do any checking for a value-dependent SIZE. Just
7137 build the index type and mark that it requires structural
7139 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7140 size, integer_one_node));
7141 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7145 if (!abi_version_at_least (2) && processing_template_decl)
7146 /* For abi-1, we handled all instances in templates the same way,
7147 even when they were non-dependent. This affects the manglings
7148 produced. So, we do the normal checking for non-dependent
7149 sizes, but at the end we'll return the same type that abi-1
7150 would have, but with TYPE_CANONICAL set to the "right"
7151 value that the current ABI would provide. */
7152 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7153 size, integer_one_node));
7155 /* The size might be the result of a cast. */
7156 STRIP_TYPE_NOPS (size);
7158 /* It might be a const variable or enumeration constant. */
7159 size = integral_constant_value (size);
7161 /* Normally, the array-bound will be a constant. */
7162 if (TREE_CODE (size) == INTEGER_CST)
7164 /* Check to see if the array bound overflowed. Make that an
7165 error, no matter how generous we're being. */
7166 constant_expression_error (size);
7168 /* An array must have a positive number of elements. */
7169 if (INT_CST_LT (size, integer_zero_node))
7172 error ("size of array %qD is negative", name);
7174 error ("size of array is negative");
7175 size = integer_one_node;
7177 /* As an extension we allow zero-sized arrays. We always allow
7178 them in system headers because glibc uses them. */
7179 else if (integer_zerop (size) && !in_system_header)
7182 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7184 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7187 else if (TREE_CONSTANT (size))
7189 /* `(int) &fn' is not a valid array bound. */
7191 error ("size of array %qD is not an integral constant-expression",
7194 error ("size of array is not an integral constant-expression");
7195 size = integer_one_node;
7197 else if (pedantic && warn_vla != 0)
7200 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7202 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7204 else if (warn_vla > 0)
7208 "variable length array %qD is used", name);
7211 "variable length array is used");
7214 if (processing_template_decl && !TREE_CONSTANT (size))
7215 /* A variable sized array. */
7216 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7219 HOST_WIDE_INT saved_processing_template_decl;
7221 /* Compute the index of the largest element in the array. It is
7222 one less than the number of elements in the array. We save
7223 and restore PROCESSING_TEMPLATE_DECL so that computations in
7224 cp_build_binary_op will be appropriately folded. */
7225 saved_processing_template_decl = processing_template_decl;
7226 processing_template_decl = 0;
7227 itype = cp_build_binary_op (input_location,
7229 cp_convert (ssizetype, size),
7230 cp_convert (ssizetype, integer_one_node),
7231 tf_warning_or_error);
7232 itype = fold (itype);
7233 processing_template_decl = saved_processing_template_decl;
7235 if (!TREE_CONSTANT (itype))
7236 /* A variable sized array. */
7237 itype = variable_size (itype);
7238 /* Make sure that there was no overflow when creating to a signed
7239 index type. (For example, on a 32-bit machine, an array with
7240 size 2^32 - 1 is too big.) */
7241 else if (TREE_CODE (itype) == INTEGER_CST
7242 && TREE_OVERFLOW (itype))
7244 error ("overflow in array dimension");
7245 TREE_OVERFLOW (itype) = 0;
7249 /* Create and return the appropriate index type. */
7252 tree t = build_index_type (itype);
7253 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7257 return build_index_type (itype);
7260 /* Returns the scope (if any) in which the entity declared by
7261 DECLARATOR will be located. If the entity was declared with an
7262 unqualified name, NULL_TREE is returned. */
7265 get_scope_of_declarator (const cp_declarator *declarator)
7267 while (declarator && declarator->kind != cdk_id)
7268 declarator = declarator->declarator;
7270 /* If the declarator-id is a SCOPE_REF, the scope in which the
7271 declaration occurs is the first operand. */
7273 && declarator->u.id.qualifying_scope)
7274 return declarator->u.id.qualifying_scope;
7276 /* Otherwise, the declarator is not a qualified name; the entity will
7277 be declared in the current scope. */
7281 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7282 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7286 create_array_type_for_decl (tree name, tree type, tree size)
7288 tree itype = NULL_TREE;
7289 const char* error_msg;
7291 /* If things have already gone awry, bail now. */
7292 if (type == error_mark_node || size == error_mark_node)
7293 return error_mark_node;
7295 /* Assume that everything will go OK. */
7298 /* There are some types which cannot be array elements. */
7299 switch (TREE_CODE (type))
7302 error_msg = "array of void";
7306 error_msg = "array of functions";
7309 case REFERENCE_TYPE:
7310 error_msg = "array of references";
7314 error_msg = "array of function members";
7321 /* If something went wrong, issue an error-message and return. */
7325 error ("declaration of %qD as %s", name, error_msg);
7327 error ("creating %s", error_msg);
7329 return error_mark_node;
7334 The constant expressions that specify the bounds of the arrays
7335 can be omitted only for the first member of the sequence. */
7336 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7339 error ("declaration of %qD as multidimensional array must "
7340 "have bounds for all dimensions except the first",
7343 error ("multidimensional array must have bounds for all "
7344 "dimensions except the first");
7346 return error_mark_node;
7349 /* Figure out the index type for the array. */
7351 itype = compute_array_index_type (name, size);
7354 T is called the array element type; this type shall not be [...] an
7355 abstract class type. */
7356 abstract_virtuals_error (name, type);
7358 return build_cplus_array_type (type, itype);
7361 /* Check that it's OK to declare a function with the indicated TYPE.
7362 SFK indicates the kind of special function (if any) that this
7363 function is. OPTYPE is the type given in a conversion operator
7364 declaration, or the class type for a constructor/destructor.
7365 Returns the actual return type of the function; that
7366 may be different than TYPE if an error occurs, or for certain
7367 special functions. */
7370 check_special_function_return_type (special_function_kind sfk,
7376 case sfk_constructor:
7378 error ("return type specification for constructor invalid");
7380 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7381 type = build_pointer_type (optype);
7383 type = void_type_node;
7386 case sfk_destructor:
7388 error ("return type specification for destructor invalid");
7389 /* We can't use the proper return type here because we run into
7390 problems with ambiguous bases and covariant returns.
7391 Java classes are left unchanged because (void *) isn't a valid
7392 Java type, and we don't want to change the Java ABI. */
7393 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7394 type = build_pointer_type (void_type_node);
7396 type = void_type_node;
7399 case sfk_conversion:
7401 error ("return type specified for %<operator %T%>", optype);
7412 /* A variable or data member (whose unqualified name is IDENTIFIER)
7413 has been declared with the indicated TYPE. If the TYPE is not
7414 acceptable, issue an error message and return a type to use for
7415 error-recovery purposes. */
7418 check_var_type (tree identifier, tree type)
7420 if (VOID_TYPE_P (type))
7423 error ("unnamed variable or field declared void");
7424 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7426 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7427 error ("variable or field %qE declared void", identifier);
7430 error ("variable or field declared void");
7431 type = error_mark_node;
7437 /* Given declspecs and a declarator (abstract or otherwise), determine
7438 the name and type of the object declared and construct a DECL node
7441 DECLSPECS points to the representation of declaration-specifier
7442 sequence that precedes declarator.
7444 DECL_CONTEXT says which syntactic context this declaration is in:
7445 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7446 FUNCDEF for a function definition. Like NORMAL but a few different
7447 error messages in each case. Return value may be zero meaning
7448 this definition is too screwy to try to parse.
7449 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7450 handle member functions (which have FIELD context).
7451 Return value may be zero meaning this definition is too screwy to
7453 PARM for a parameter declaration (either within a function prototype
7454 or before a function body). Make a PARM_DECL, or return void_type_node.
7455 CATCHPARM for a parameter declaration before a catch clause.
7456 TYPENAME if for a typename (in a cast or sizeof).
7457 Don't make a DECL node; just return the ..._TYPE node.
7458 FIELD for a struct or union field; make a FIELD_DECL.
7459 BITFIELD for a field with specified width.
7460 INITIALIZED is as for start_decl.
7462 ATTRLIST is a pointer to the list of attributes, which may be NULL
7463 if there are none; *ATTRLIST may be modified if attributes from inside
7464 the declarator should be applied to the declaration.
7466 When this function is called, scoping variables (such as
7467 CURRENT_CLASS_TYPE) should reflect the scope in which the
7468 declaration occurs, not the scope in which the new declaration will
7469 be placed. For example, on:
7473 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7476 Returns a DECL (if a declarator is present), a TYPE (if there is no
7477 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7481 grokdeclarator (const cp_declarator *declarator,
7482 const cp_decl_specifier_seq *declspecs,
7483 enum decl_context decl_context,
7487 tree type = NULL_TREE;
7489 int virtualp, explicitp, friendp, inlinep, staticp;
7490 int explicit_int = 0;
7491 int explicit_char = 0;
7492 int defaulted_int = 0;
7493 tree dependent_name = NULL_TREE;
7495 tree typedef_decl = NULL_TREE;
7496 const char *name = NULL;
7497 tree typedef_type = NULL_TREE;
7498 /* True if this declarator is a function definition. */
7499 bool funcdef_flag = false;
7500 cp_declarator_kind innermost_code = cdk_error;
7503 /* See the code below that used this. */
7504 tree decl_attr = NULL_TREE;
7507 /* Keep track of what sort of function is being processed
7508 so that we can warn about default return values, or explicit
7509 return values which do not match prescribed defaults. */
7510 special_function_kind sfk = sfk_none;
7512 tree dname = NULL_TREE;
7513 tree ctor_return_type = NULL_TREE;
7514 enum overload_flags flags = NO_SPECIAL;
7515 /* cv-qualifiers that apply to the declarator, for a declaration of
7516 a member function. */
7517 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7518 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7520 tree raises = NULL_TREE;
7521 int template_count = 0;
7522 tree returned_attrs = NULL_TREE;
7523 tree parms = NULL_TREE;
7524 const cp_declarator *id_declarator;
7525 /* The unqualified name of the declarator; either an
7526 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7527 tree unqualified_id;
7528 /* The class type, if any, in which this entity is located,
7529 or NULL_TREE if none. Note that this value may be different from
7530 the current class type; for example if an attempt is made to declare
7531 "A::f" inside "B", this value will be "A". */
7532 tree ctype = current_class_type;
7533 /* The NAMESPACE_DECL for the namespace in which this entity is
7534 located. If an unqualified name is used to declare the entity,
7535 this value will be NULL_TREE, even if the entity is located at
7537 tree in_namespace = NULL_TREE;
7538 cp_storage_class storage_class;
7539 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7540 bool type_was_error_mark_node = false;
7541 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7542 bool set_no_warning = false;
7544 signed_p = declspecs->specs[(int)ds_signed];
7545 unsigned_p = declspecs->specs[(int)ds_unsigned];
7546 short_p = declspecs->specs[(int)ds_short];
7547 long_p = declspecs->specs[(int)ds_long];
7548 longlong = declspecs->specs[(int)ds_long] >= 2;
7549 thread_p = declspecs->specs[(int)ds_thread];
7551 if (decl_context == FUNCDEF)
7552 funcdef_flag = true, decl_context = NORMAL;
7553 else if (decl_context == MEMFUNCDEF)
7554 funcdef_flag = true, decl_context = FIELD;
7555 else if (decl_context == BITFIELD)
7556 bitfield = 1, decl_context = FIELD;
7558 if (initialized > 1)
7559 funcdef_flag = true;
7561 /* Look inside a declarator for the name being declared
7562 and get it as a string, for an error message. */
7563 for (id_declarator = declarator;
7565 id_declarator = id_declarator->declarator)
7567 if (id_declarator->kind != cdk_id)
7568 innermost_code = id_declarator->kind;
7570 switch (id_declarator->kind)
7573 if (id_declarator->declarator
7574 && id_declarator->declarator->kind == cdk_id)
7576 sfk = id_declarator->declarator->u.id.sfk;
7577 if (sfk == sfk_destructor)
7584 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7585 tree decl = id_declarator->u.id.unqualified_name;
7588 if (qualifying_scope)
7590 if (at_function_scope_p ())
7594 A declarator-id shall not be qualified except
7597 None of the cases are permitted in block
7599 if (qualifying_scope == global_namespace)
7600 error ("invalid use of qualified-name %<::%D%>",
7602 else if (TYPE_P (qualifying_scope))
7603 error ("invalid use of qualified-name %<%T::%D%>",
7604 qualifying_scope, decl);
7606 error ("invalid use of qualified-name %<%D::%D%>",
7607 qualifying_scope, decl);
7608 return error_mark_node;
7610 else if (TYPE_P (qualifying_scope))
7612 ctype = qualifying_scope;
7613 if (innermost_code != cdk_function
7614 && current_class_type
7615 && !UNIQUELY_DERIVED_FROM_P (ctype,
7616 current_class_type))
7618 error ("type %qT is not derived from type %qT",
7619 ctype, current_class_type);
7620 return error_mark_node;
7623 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7624 in_namespace = qualifying_scope;
7626 switch (TREE_CODE (decl))
7632 if (innermost_code != cdk_function)
7634 error ("declaration of %qD as non-function", decl);
7635 return error_mark_node;
7637 else if (!qualifying_scope
7638 && !(current_class_type && at_class_scope_p ()))
7640 error ("declaration of %qD as non-member", decl);
7641 return error_mark_node;
7644 type = TREE_OPERAND (decl, 0);
7645 name = IDENTIFIER_POINTER (constructor_name (type));
7650 case TEMPLATE_ID_EXPR:
7652 tree fns = TREE_OPERAND (decl, 0);
7655 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7657 gcc_assert (is_overloaded_fn (dname));
7658 dname = DECL_NAME (get_first_fn (dname));
7663 case IDENTIFIER_NODE:
7664 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7667 if (C_IS_RESERVED_WORD (dname))
7669 error ("declarator-id missing; using reserved word %qD",
7671 name = IDENTIFIER_POINTER (dname);
7673 else if (!IDENTIFIER_TYPENAME_P (dname))
7674 name = IDENTIFIER_POINTER (dname);
7677 gcc_assert (flags == NO_SPECIAL);
7678 flags = TYPENAME_FLAG;
7679 ctor_return_type = TREE_TYPE (dname);
7680 sfk = sfk_conversion;
7681 if (is_typename_at_global_scope (dname))
7682 name = IDENTIFIER_POINTER (dname);
7684 name = "<invalid operator>";
7701 return error_mark_node;
7706 if (id_declarator->kind == cdk_id)
7712 The declarator in a function-definition shall have the form
7713 D1 ( parameter-declaration-clause) ... */
7714 if (funcdef_flag && innermost_code != cdk_function)
7716 error ("function definition does not declare parameters");
7717 return error_mark_node;
7720 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7721 && innermost_code != cdk_function
7722 && ! (ctype && !declspecs->any_specifiers_p))
7724 error ("declaration of %qD as non-function", dname);
7725 return error_mark_node;
7728 /* Anything declared one level down from the top level
7729 must be one of the parameters of a function
7730 (because the body is at least two levels down). */
7732 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7733 by not allowing C++ class definitions to specify their parameters
7734 with xdecls (must be spec.d in the parmlist).
7736 Since we now wait to push a class scope until we are sure that
7737 we are in a legitimate method context, we must set oldcname
7738 explicitly (since current_class_name is not yet alive).
7740 We also want to avoid calling this a PARM if it is in a namespace. */
7742 if (decl_context == NORMAL && !toplevel_bindings_p ())
7744 struct cp_binding_level *b = current_binding_level;
7745 current_binding_level = b->level_chain;
7746 if (current_binding_level != 0 && toplevel_bindings_p ())
7747 decl_context = PARM;
7748 current_binding_level = b;
7752 name = decl_context == PARM ? "parameter" : "type name";
7754 /* If there were multiple types specified in the decl-specifier-seq,
7755 issue an error message. */
7756 if (declspecs->multiple_types_p)
7758 error ("two or more data types in declaration of %qs", name);
7759 return error_mark_node;
7762 if (declspecs->conflicting_specifiers_p)
7764 error ("conflicting specifiers in declaration of %qs", name);
7765 return error_mark_node;
7768 /* Extract the basic type from the decl-specifier-seq. */
7769 type = declspecs->type;
7770 if (type == error_mark_node)
7773 type_was_error_mark_node = true;
7775 /* If the entire declaration is itself tagged as deprecated then
7776 suppress reports of deprecated items. */
7777 if (type && TREE_DEPRECATED (type)
7778 && deprecated_state != DEPRECATED_SUPPRESS)
7779 warn_deprecated_use (type);
7780 if (type && TREE_CODE (type) == TYPE_DECL)
7782 typedef_decl = type;
7783 type = TREE_TYPE (typedef_decl);
7784 if (TREE_DEPRECATED (type)
7785 && DECL_ARTIFICIAL (typedef_decl)
7786 && deprecated_state != DEPRECATED_SUPPRESS)
7787 warn_deprecated_use (type);
7789 /* No type at all: default to `int', and set DEFAULTED_INT
7790 because it was not a user-defined typedef. */
7791 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7793 /* These imply 'int'. */
7794 type = integer_type_node;
7798 explicit_int = declspecs->explicit_int_p;
7799 explicit_char = declspecs->explicit_char_p;
7802 /* See the code below that used this. */
7804 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7806 typedef_type = type;
7809 if (sfk != sfk_conversion)
7810 ctor_return_type = ctype;
7812 if (sfk != sfk_none)
7813 type = check_special_function_return_type (sfk, type,
7815 else if (type == NULL_TREE)
7821 /* We handle `main' specially here, because 'main () { }' is so
7822 common. With no options, it is allowed. With -Wreturn-type,
7823 it is a warning. It is only an error with -pedantic-errors. */
7824 is_main = (funcdef_flag
7825 && dname && MAIN_NAME_P (dname)
7826 && ctype == NULL_TREE
7827 && in_namespace == NULL_TREE
7828 && current_namespace == global_namespace);
7830 if (type_was_error_mark_node)
7831 /* We've already issued an error, don't complain more. */;
7832 else if (in_system_header || flag_ms_extensions)
7833 /* Allow it, sigh. */;
7835 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7837 pedwarn (input_location, OPT_pedantic,
7838 "ISO C++ forbids declaration of %qs with no type", name);
7840 warning (OPT_Wreturn_type,
7841 "ISO C++ forbids declaration of %qs with no type", name);
7843 type = integer_type_node;
7848 /* Now process the modifiers that were specified
7849 and check for invalid combinations. */
7851 /* Long double is a special combination. */
7852 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7855 type = build_qualified_type (long_double_type_node,
7856 cp_type_quals (type));
7859 /* Check all other uses of type modifiers. */
7861 if (unsigned_p || signed_p || long_p || short_p)
7865 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7866 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7867 else if (signed_p && unsigned_p)
7868 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7869 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7870 error ("%<long long%> invalid for %qs", name);
7871 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7872 error ("%<long%> invalid for %qs", name);
7873 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7874 error ("%<short%> invalid for %qs", name);
7875 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7876 error ("%<long%> or %<short%> invalid for %qs", name);
7877 else if ((long_p || short_p) && explicit_char)
7878 error ("%<long%> or %<short%> specified with char for %qs", name);
7879 else if (long_p && short_p)
7880 error ("%<long%> and %<short%> specified together for %qs", name);
7881 else if (type == char16_type_node || type == char32_type_node)
7883 if (signed_p || unsigned_p)
7884 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7885 else if (short_p || long_p)
7886 error ("%<short%> or %<long%> invalid for %qs", name);
7891 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7893 pedwarn (input_location, OPT_pedantic,
7894 "long, short, signed or unsigned used invalidly for %qs",
7896 if (flag_pedantic_errors)
7901 /* Discard the type modifiers if they are invalid. */
7912 /* Decide whether an integer type is signed or not.
7913 Optionally treat bitfields as signed by default. */
7917 It is implementation-defined whether a plain (neither
7918 explicitly signed or unsigned) char, short, int, or long
7919 bit-field is signed or unsigned.
7921 Naturally, we extend this to long long as well. Note that
7922 this does not include wchar_t. */
7923 || (bitfield && !flag_signed_bitfields
7925 /* A typedef for plain `int' without `signed' can be
7926 controlled just like plain `int', but a typedef for
7927 `signed int' cannot be so controlled. */
7929 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7930 && TREE_CODE (type) == INTEGER_TYPE
7931 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7934 type = long_long_unsigned_type_node;
7936 type = long_unsigned_type_node;
7938 type = short_unsigned_type_node;
7939 else if (type == char_type_node)
7940 type = unsigned_char_type_node;
7941 else if (typedef_decl)
7942 type = unsigned_type_for (type);
7944 type = unsigned_type_node;
7946 else if (signed_p && type == char_type_node)
7947 type = signed_char_type_node;
7949 type = long_long_integer_type_node;
7951 type = long_integer_type_node;
7953 type = short_integer_type_node;
7955 if (declspecs->specs[(int)ds_complex])
7957 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7958 error ("complex invalid for %qs", name);
7959 /* If we just have "complex", it is equivalent to
7960 "complex double", but if any modifiers at all are specified it is
7961 the complex form of TYPE. E.g, "complex short" is
7962 "complex short int". */
7964 else if (defaulted_int && ! longlong
7965 && ! (long_p || short_p || signed_p || unsigned_p))
7966 type = complex_double_type_node;
7967 else if (type == integer_type_node)
7968 type = complex_integer_type_node;
7969 else if (type == float_type_node)
7970 type = complex_float_type_node;
7971 else if (type == double_type_node)
7972 type = complex_double_type_node;
7973 else if (type == long_double_type_node)
7974 type = complex_long_double_type_node;
7976 type = build_complex_type (type);
7979 type_quals = TYPE_UNQUALIFIED;
7980 if (declspecs->specs[(int)ds_const])
7981 type_quals |= TYPE_QUAL_CONST;
7982 if (declspecs->specs[(int)ds_volatile])
7983 type_quals |= TYPE_QUAL_VOLATILE;
7984 if (declspecs->specs[(int)ds_restrict])
7985 type_quals |= TYPE_QUAL_RESTRICT;
7986 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7987 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7990 if (TREE_CODE (type) == FUNCTION_TYPE
7991 && type_quals != TYPE_UNQUALIFIED)
7993 /* This was an error in C++98 (cv-qualifiers cannot be added to
7994 a function type), but DR 295 makes the code well-formed by
7995 dropping the extra qualifiers. */
7998 tree bad_type = build_qualified_type (type, type_quals);
7999 pedwarn (input_location, OPT_pedantic,
8000 "ignoring %qV qualifiers added to function type %qT",
8003 type_quals = TYPE_UNQUALIFIED;
8005 type_quals |= cp_type_quals (type);
8006 type = cp_build_qualified_type_real
8007 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8008 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8009 /* We might have ignored or rejected some of the qualifiers. */
8010 type_quals = cp_type_quals (type);
8013 inlinep = !! declspecs->specs[(int)ds_inline];
8014 virtualp = !! declspecs->specs[(int)ds_virtual];
8015 explicitp = !! declspecs->specs[(int)ds_explicit];
8017 storage_class = declspecs->storage_class;
8018 if (storage_class == sc_static)
8019 staticp = 1 + (decl_context == FIELD);
8021 if (virtualp && staticp == 2)
8023 error ("member %qD cannot be declared both virtual and static", dname);
8024 storage_class = sc_none;
8027 friendp = !! declspecs->specs[(int)ds_friend];
8029 if (dependent_name && !friendp)
8031 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8032 return error_mark_node;
8035 /* Issue errors about use of storage classes for parameters. */
8036 if (decl_context == PARM)
8038 if (declspecs->specs[(int)ds_typedef])
8040 error ("typedef declaration invalid in parameter declaration");
8041 return error_mark_node;
8043 else if (storage_class == sc_static
8044 || storage_class == sc_extern
8046 error ("storage class specifiers invalid in parameter declarations");
8049 /* Give error if `virtual' is used outside of class declaration. */
8051 && (current_class_name == NULL_TREE || decl_context != FIELD))
8053 error ("%<virtual%> outside class declaration");
8057 /* Static anonymous unions are dealt with here. */
8058 if (staticp && decl_context == TYPENAME
8060 && ANON_AGGR_TYPE_P (declspecs->type))
8061 decl_context = FIELD;
8063 /* Warn about storage classes that are invalid for certain
8064 kinds of declarations (parameters, typenames, etc.). */
8067 && storage_class != sc_extern
8068 && storage_class != sc_static)
8069 || declspecs->specs[(int)ds_typedef]))
8071 error ("multiple storage classes in declaration of %qs", name);
8074 if (decl_context != NORMAL
8075 && ((storage_class != sc_none
8076 && storage_class != sc_mutable)
8079 if ((decl_context == PARM || decl_context == CATCHPARM)
8080 && (storage_class == sc_register
8081 || storage_class == sc_auto))
8083 else if (declspecs->specs[(int)ds_typedef])
8085 else if (decl_context == FIELD
8086 /* C++ allows static class elements. */
8087 && storage_class == sc_static)
8088 /* C++ also allows inlines and signed and unsigned elements,
8089 but in those cases we don't come in here. */
8093 if (decl_context == FIELD)
8094 error ("storage class specified for %qs", name);
8097 if (decl_context == PARM || decl_context == CATCHPARM)
8098 error ("storage class specified for parameter %qs", name);
8100 error ("storage class specified for typename");
8102 if (storage_class == sc_register
8103 || storage_class == sc_auto
8104 || storage_class == sc_extern
8106 storage_class = sc_none;
8109 else if (storage_class == sc_extern && funcdef_flag
8110 && ! toplevel_bindings_p ())
8111 error ("nested function %qs declared %<extern%>", name);
8112 else if (toplevel_bindings_p ())
8114 if (storage_class == sc_auto)
8115 error ("top-level declaration of %qs specifies %<auto%>", name);
8118 && storage_class != sc_extern
8119 && storage_class != sc_static)
8121 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8126 if (storage_class && friendp)
8128 error ("storage class specifiers invalid in friend function declarations");
8129 storage_class = sc_none;
8134 unqualified_id = NULL_TREE;
8137 unqualified_id = id_declarator->u.id.unqualified_name;
8138 switch (TREE_CODE (unqualified_id))
8142 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8145 case IDENTIFIER_NODE:
8146 case TEMPLATE_ID_EXPR:
8154 /* Determine the type of the entity declared by recurring on the
8156 for (; declarator; declarator = declarator->declarator)
8158 const cp_declarator *inner_declarator;
8161 if (type == error_mark_node)
8162 return error_mark_node;
8164 attrs = declarator->attributes;
8170 if (declarator == NULL || declarator->kind == cdk_id)
8171 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8172 if (declarator->kind == cdk_function)
8173 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8174 if (declarator->kind == cdk_array)
8175 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8176 returned_attrs = decl_attributes (&type,
8177 chainon (returned_attrs, attrs),
8181 if (declarator->kind == cdk_id)
8184 inner_declarator = declarator->declarator;
8186 switch (declarator->kind)
8189 type = create_array_type_for_decl (dname, type,
8190 declarator->u.array.bounds);
8198 /* Declaring a function type.
8199 Make sure we have a valid type for the function to return. */
8201 if (type_quals != TYPE_UNQUALIFIED)
8203 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8204 warning (OPT_Wignored_qualifiers,
8205 "type qualifiers ignored on function return type");
8206 /* We now know that the TYPE_QUALS don't apply to the
8207 decl, but to its return type. */
8208 type_quals = TYPE_UNQUALIFIED;
8209 set_no_warning = true;
8212 /* Error about some types functions can't return. */
8214 if (TREE_CODE (type) == FUNCTION_TYPE)
8216 error ("%qs declared as function returning a function", name);
8217 return error_mark_node;
8219 if (TREE_CODE (type) == ARRAY_TYPE)
8221 error ("%qs declared as function returning an array", name);
8222 return error_mark_node;
8225 /* Pick up type qualifiers which should be applied to `this'. */
8226 memfn_quals = declarator->u.function.qualifiers;
8228 /* Pick up the exception specifications. */
8229 raises = declarator->u.function.exception_specification;
8231 /* Handle a late-specified return type. */
8232 type = splice_late_return_type
8233 (type, declarator->u.function.late_return_type);
8234 if (type == error_mark_node)
8235 return error_mark_node;
8237 /* Say it's a definition only for the CALL_EXPR
8238 closest to the identifier. */
8239 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8241 if (ctype == NULL_TREE
8242 && decl_context == FIELD
8244 && (friendp == 0 || dname == current_class_name))
8245 ctype = current_class_type;
8247 if (ctype && (sfk == sfk_constructor
8248 || sfk == sfk_destructor))
8250 /* We are within a class's scope. If our declarator name
8251 is the same as the class name, and we are defining
8252 a function, then it is a constructor/destructor, and
8253 therefore returns a void type. */
8255 /* ISO C++ 12.4/2. A destructor may not be declared
8256 const or volatile. A destructor may not be
8259 ISO C++ 12.1. A constructor may not be declared
8260 const or volatile. A constructor may not be
8261 virtual. A constructor may not be static. */
8263 error ((flags == DTOR_FLAG)
8264 ? "destructor cannot be static member function"
8265 : "constructor cannot be static member function");
8268 error ((flags == DTOR_FLAG)
8269 ? "destructors may not be cv-qualified"
8270 : "constructors may not be cv-qualified");
8271 memfn_quals = TYPE_UNQUALIFIED;
8274 if (decl_context == FIELD
8275 && !member_function_or_else (ctype,
8278 return error_mark_node;
8280 if (flags != DTOR_FLAG)
8282 /* It's a constructor. */
8287 permerror (input_location, "constructors cannot be declared virtual");
8290 if (decl_context == FIELD
8291 && sfk != sfk_constructor)
8292 return error_mark_node;
8294 if (decl_context == FIELD)
8300 error ("can't initialize friend function %qs", name);
8303 /* Cannot be both friend and virtual. */
8304 error ("virtual functions cannot be friends");
8307 if (decl_context == NORMAL)
8308 error ("friend declaration not in class definition");
8309 if (current_function_decl && funcdef_flag)
8310 error ("can't define friend function %qs in a local "
8315 arg_types = grokparms (declarator->u.function.parameters,
8318 if (inner_declarator
8319 && inner_declarator->kind == cdk_id
8320 && inner_declarator->u.id.sfk == sfk_destructor
8321 && arg_types != void_list_node)
8323 error ("destructors may not have parameters");
8324 arg_types = void_list_node;
8328 type = build_function_type (type, arg_types);
8335 /* Filter out pointers-to-references and references-to-references.
8336 We can get these if a TYPE_DECL is used. */
8338 if (TREE_CODE (type) == REFERENCE_TYPE)
8340 if (declarator->kind != cdk_reference)
8342 error ("cannot declare pointer to %q#T", type);
8343 type = TREE_TYPE (type);
8346 /* In C++0x, we allow reference to reference declarations
8347 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8348 and template type arguments [14.3.1/4 temp.arg.type]. The
8349 check for direct reference to reference declarations, which
8350 are still forbidden, occurs below. Reasoning behind the change
8351 can be found in DR106, DR540, and the rvalue reference
8353 else if (cxx_dialect == cxx98)
8355 error ("cannot declare reference to %q#T", type);
8356 type = TREE_TYPE (type);
8359 else if (VOID_TYPE_P (type))
8361 if (declarator->kind == cdk_reference)
8362 error ("cannot declare reference to %q#T", type);
8363 else if (declarator->kind == cdk_ptrmem)
8364 error ("cannot declare pointer to %q#T member", type);
8367 /* We now know that the TYPE_QUALS don't apply to the decl,
8368 but to the target of the pointer. */
8369 type_quals = TYPE_UNQUALIFIED;
8371 if (declarator->kind == cdk_ptrmem
8372 && (TREE_CODE (type) == FUNCTION_TYPE
8373 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8375 memfn_quals |= cp_type_quals (type);
8376 type = build_memfn_type (type,
8377 declarator->u.pointer.class_type,
8379 memfn_quals = TYPE_UNQUALIFIED;
8382 if (declarator->kind == cdk_reference)
8384 /* In C++0x, the type we are creating a reference to might be
8385 a typedef which is itself a reference type. In that case,
8386 we follow the reference collapsing rules in
8387 [7.1.3/8 dcl.typedef] to create the final reference type:
8389 "If a typedef TD names a type that is a reference to a type
8390 T, an attempt to create the type 'lvalue reference to cv TD'
8391 creates the type 'lvalue reference to T,' while an attempt
8392 to create the type "rvalue reference to cv TD' creates the
8395 if (!VOID_TYPE_P (type))
8396 type = cp_build_reference_type
8397 ((TREE_CODE (type) == REFERENCE_TYPE
8398 ? TREE_TYPE (type) : type),
8399 (declarator->u.reference.rvalue_ref
8400 && (TREE_CODE(type) != REFERENCE_TYPE
8401 || TYPE_REF_IS_RVALUE (type))));
8403 /* In C++0x, we need this check for direct reference to
8404 reference declarations, which are forbidden by
8405 [8.3.2/5 dcl.ref]. Reference to reference declarations
8406 are only allowed indirectly through typedefs and template
8407 type arguments. Example:
8409 void foo(int & &); // invalid ref-to-ref decl
8411 typedef int & int_ref;
8412 void foo(int_ref &); // valid ref-to-ref decl
8414 if (inner_declarator && inner_declarator->kind == cdk_reference)
8415 error ("cannot declare reference to %q#T, which is not "
8416 "a typedef or a template type argument", type);
8418 else if (TREE_CODE (type) == METHOD_TYPE)
8419 type = build_ptrmemfunc_type (build_pointer_type (type));
8420 else if (declarator->kind == cdk_ptrmem)
8422 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8424 if (declarator->u.pointer.class_type == error_mark_node)
8425 /* We will already have complained. */
8426 type = error_mark_node;
8428 type = build_ptrmem_type (declarator->u.pointer.class_type,
8432 type = build_pointer_type (type);
8434 /* Process a list of type modifier keywords (such as
8435 const or volatile) that were given inside the `*' or `&'. */
8437 if (declarator->u.pointer.qualifiers)
8440 = cp_build_qualified_type (type,
8441 declarator->u.pointer.qualifiers);
8442 type_quals = cp_type_quals (type);
8455 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8456 && TREE_CODE (type) != FUNCTION_TYPE
8457 && TREE_CODE (type) != METHOD_TYPE)
8459 error ("template-id %qD used as a declarator",
8461 unqualified_id = dname;
8464 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8465 qualified with a class-name, turn it into a METHOD_TYPE, unless
8466 we know that the function is static. We take advantage of this
8467 opportunity to do other processing that pertains to entities
8468 explicitly declared to be class members. Note that if DECLARATOR
8469 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8470 would not have exited the loop above. */
8472 && declarator->u.id.qualifying_scope
8473 && TYPE_P (declarator->u.id.qualifying_scope))
8477 ctype = declarator->u.id.qualifying_scope;
8478 ctype = TYPE_MAIN_VARIANT (ctype);
8480 while (t != NULL_TREE && CLASS_TYPE_P (t))
8482 /* You're supposed to have one `template <...>' for every
8483 template class, but you don't need one for a full
8484 specialization. For example:
8486 template <class T> struct S{};
8487 template <> struct S<int> { void f(); };
8488 void S<int>::f () {}
8490 is correct; there shouldn't be a `template <>' for the
8491 definition of `S<int>::f'. */
8492 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8493 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8494 /* T is an explicit (not partial) specialization. All
8495 containing classes must therefore also be explicitly
8498 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8499 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8500 template_count += 1;
8502 t = TYPE_MAIN_DECL (t);
8503 t = DECL_CONTEXT (t);
8506 if (ctype == current_class_type)
8510 permerror (input_location, "member functions are implicitly friends of their class");
8514 permerror (declarator->id_loc,
8515 "extra qualification %<%T::%> on member %qs",
8518 else if (/* If the qualifying type is already complete, then we
8519 can skip the following checks. */
8520 !COMPLETE_TYPE_P (ctype)
8521 && (/* If the function is being defined, then
8522 qualifying type must certainly be complete. */
8524 /* A friend declaration of "T::f" is OK, even if
8525 "T" is a template parameter. But, if this
8526 function is not a friend, the qualifying type
8528 || (!friendp && !CLASS_TYPE_P (ctype))
8529 /* For a declaration, the type need not be
8530 complete, if either it is dependent (since there
8531 is no meaningful definition of complete in that
8532 case) or the qualifying class is currently being
8534 || !(dependent_type_p (ctype)
8535 || currently_open_class (ctype)))
8536 /* Check that the qualifying type is complete. */
8537 && !complete_type_or_else (ctype, NULL_TREE))
8538 return error_mark_node;
8539 else if (TREE_CODE (type) == FUNCTION_TYPE)
8541 tree sname = declarator->u.id.unqualified_name;
8543 if (current_class_type
8544 && (!friendp || funcdef_flag))
8547 ? "cannot define member function %<%T::%s%> within %<%T%>"
8548 : "cannot declare member function %<%T::%s%> within %<%T%>",
8549 ctype, name, current_class_type);
8550 return error_mark_node;
8553 if (TREE_CODE (sname) == IDENTIFIER_NODE
8554 && NEW_DELETE_OPNAME_P (sname))
8555 /* Overloaded operator new and operator delete
8556 are always static functions. */
8559 type = build_memfn_type (type, ctype, memfn_quals);
8561 else if (declspecs->specs[(int)ds_typedef]
8562 && current_class_type)
8564 error ("cannot declare member %<%T::%s%> within %qT",
8565 ctype, name, current_class_type);
8566 return error_mark_node;
8570 /* Now TYPE has the actual type. */
8575 *attrlist = chainon (returned_attrs, *attrlist);
8577 attrlist = &returned_attrs;
8580 /* Handle parameter packs. */
8581 if (parameter_pack_p)
8583 if (decl_context == PARM)
8584 /* Turn the type into a pack expansion.*/
8585 type = make_pack_expansion (type);
8587 error ("non-parameter %qs cannot be a parameter pack", name);
8590 /* Did array size calculations overflow? */
8592 if (TREE_CODE (type) == ARRAY_TYPE
8593 && COMPLETE_TYPE_P (type)
8594 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8595 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8597 error ("size of array %qs is too large", name);
8598 /* If we proceed with the array type as it is, we'll eventually
8599 crash in tree_low_cst(). */
8600 type = error_mark_node;
8603 if ((decl_context == FIELD || decl_context == PARM)
8604 && !processing_template_decl
8605 && variably_modified_type_p (type, NULL_TREE))
8607 if (decl_context == FIELD)
8608 error ("data member may not have variably modified type %qT", type);
8610 error ("parameter may not have variably modified type %qT", type);
8611 type = error_mark_node;
8614 if (explicitp == 1 || (explicitp && friendp))
8616 /* [dcl.fct.spec] The explicit specifier shall only be used in
8617 declarations of constructors within a class definition. */
8618 error ("only declarations of constructors can be %<explicit%>");
8622 if (storage_class == sc_mutable)
8624 if (decl_context != FIELD || friendp)
8626 error ("non-member %qs cannot be declared %<mutable%>", name);
8627 storage_class = sc_none;
8629 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8631 error ("non-object member %qs cannot be declared %<mutable%>", name);
8632 storage_class = sc_none;
8634 else if (TREE_CODE (type) == FUNCTION_TYPE
8635 || TREE_CODE (type) == METHOD_TYPE)
8637 error ("function %qs cannot be declared %<mutable%>", name);
8638 storage_class = sc_none;
8642 error ("static %qs cannot be declared %<mutable%>", name);
8643 storage_class = sc_none;
8645 else if (type_quals & TYPE_QUAL_CONST)
8647 error ("const %qs cannot be declared %<mutable%>", name);
8648 storage_class = sc_none;
8652 /* If this is declaring a typedef name, return a TYPE_DECL. */
8653 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8657 /* Note that the grammar rejects storage classes
8658 in typenames, fields or parameters. */
8659 if (current_lang_name == lang_name_java)
8660 TYPE_FOR_JAVA (type) = 1;
8662 /* This declaration:
8664 typedef void f(int) const;
8666 declares a function type which is not a member of any
8667 particular class, but which is cv-qualified; for
8668 example "f S::*" declares a pointer to a const-qualified
8669 member function of S. We record the cv-qualification in the
8671 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8673 type = cp_build_qualified_type (type, memfn_quals);
8675 /* We have now dealt with these qualifiers. */
8676 memfn_quals = TYPE_UNQUALIFIED;
8679 if (decl_context == FIELD)
8680 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8682 decl = build_decl (TYPE_DECL, unqualified_id, type);
8683 if (id_declarator && declarator->u.id.qualifying_scope) {
8684 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8685 TREE_TYPE (decl) = error_mark_node;
8688 if (decl_context != FIELD)
8690 if (!current_function_decl)
8691 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8692 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8693 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8694 (current_function_decl)))
8695 /* The TYPE_DECL is "abstract" because there will be
8696 clones of this constructor/destructor, and there will
8697 be copies of this TYPE_DECL generated in those
8699 DECL_ABSTRACT (decl) = 1;
8701 else if (constructor_name_p (unqualified_id, current_class_type))
8702 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8703 "as enclosing class",
8706 /* If the user declares "typedef struct {...} foo" then the
8707 struct will have an anonymous name. Fill that name in now.
8708 Nothing can refer to it, so nothing needs know about the name
8710 if (type != error_mark_node
8713 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8714 && TYPE_ANONYMOUS_P (type)
8715 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8717 tree oldname = TYPE_NAME (type);
8720 /* Replace the anonymous name with the real name everywhere. */
8721 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8722 if (TYPE_NAME (t) == oldname)
8723 TYPE_NAME (t) = decl;
8725 if (TYPE_LANG_SPECIFIC (type))
8726 TYPE_WAS_ANONYMOUS (type) = 1;
8728 /* If this is a typedef within a template class, the nested
8729 type is a (non-primary) template. The name for the
8730 template needs updating as well. */
8731 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8732 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8733 = TYPE_IDENTIFIER (type);
8735 /* FIXME remangle member functions; member functions of a
8736 type with external linkage have external linkage. */
8740 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8741 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8743 bad_specifiers (decl, "type", virtualp,
8744 memfn_quals != TYPE_UNQUALIFIED,
8745 inlinep, friendp, raises != NULL_TREE);
8750 /* Detect the case of an array type of unspecified size
8751 which came, as such, direct from a typedef name.
8752 We must copy the type, so that the array's domain can be
8753 individually set by the object's initializer. */
8755 if (type && typedef_type
8756 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8757 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8758 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8760 /* Detect where we're using a typedef of function type to declare a
8761 function. PARMS will not be set, so we must create it now. */
8763 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8765 tree decls = NULL_TREE;
8768 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8770 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8772 TREE_CHAIN (decl) = decls;
8776 parms = nreverse (decls);
8778 if (decl_context != TYPENAME)
8780 /* A cv-qualifier-seq shall only be part of the function type
8781 for a non-static member function. [8.3.5/4 dcl.fct] */
8782 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8783 && (current_class_type == NULL_TREE || staticp) )
8786 ? G_("qualified function types cannot be used to "
8787 "declare static member functions")
8788 : G_("qualified function types cannot be used to "
8789 "declare free functions"));
8790 type = TYPE_MAIN_VARIANT (type);
8793 /* The qualifiers on the function type become the qualifiers on
8794 the non-static member function. */
8795 memfn_quals |= cp_type_quals (type);
8799 /* If this is a type name (such as, in a cast or sizeof),
8800 compute the type and return it now. */
8802 if (decl_context == TYPENAME)
8804 /* Note that the grammar rejects storage classes
8805 in typenames, fields or parameters. */
8806 if (type_quals != TYPE_UNQUALIFIED)
8807 type_quals = TYPE_UNQUALIFIED;
8809 /* Special case: "friend class foo" looks like a TYPENAME context. */
8812 if (type_quals != TYPE_UNQUALIFIED)
8814 error ("type qualifiers specified for friend class declaration");
8815 type_quals = TYPE_UNQUALIFIED;
8819 error ("%<inline%> specified for friend class declaration");
8825 /* Don't allow friend declaration without a class-key. */
8826 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8827 permerror (input_location, "template parameters cannot be friends");
8828 else if (TREE_CODE (type) == TYPENAME_TYPE)
8829 permerror (input_location, "friend declaration requires class-key, "
8830 "i.e. %<friend class %T::%D%>",
8831 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8833 permerror (input_location, "friend declaration requires class-key, "
8834 "i.e. %<friend %#T%>",
8838 /* Only try to do this stuff if we didn't already give up. */
8839 if (type != integer_type_node)
8841 /* A friendly class? */
8842 if (current_class_type)
8843 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8846 error ("trying to make class %qT a friend of global scope",
8849 type = void_type_node;
8852 else if (memfn_quals)
8854 if (ctype == NULL_TREE)
8856 if (TREE_CODE (type) != METHOD_TYPE)
8857 error ("invalid qualifiers on non-member function type");
8859 ctype = TYPE_METHOD_BASETYPE (type);
8862 type = build_memfn_type (type, ctype, memfn_quals);
8867 else if (unqualified_id == NULL_TREE && decl_context != PARM
8868 && decl_context != CATCHPARM
8869 && TREE_CODE (type) != UNION_TYPE
8872 error ("abstract declarator %qT used as declaration", type);
8873 return error_mark_node;
8876 /* Only functions may be declared using an operator-function-id. */
8878 && IDENTIFIER_OPNAME_P (unqualified_id)
8879 && TREE_CODE (type) != FUNCTION_TYPE
8880 && TREE_CODE (type) != METHOD_TYPE)
8882 error ("declaration of %qD as non-function", unqualified_id);
8883 return error_mark_node;
8886 /* We don't check parameter types here because we can emit a better
8887 error message later. */
8888 if (decl_context != PARM)
8890 type = check_var_type (unqualified_id, type);
8891 if (type == error_mark_node)
8892 return error_mark_node;
8895 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8896 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8898 if (decl_context == PARM || decl_context == CATCHPARM)
8900 if (ctype || in_namespace)
8901 error ("cannot use %<::%> in parameter declaration");
8903 /* A parameter declared as an array of T is really a pointer to T.
8904 One declared as a function is really a pointer to a function.
8905 One declared as a member is really a pointer to member. */
8907 if (TREE_CODE (type) == ARRAY_TYPE)
8909 /* Transfer const-ness of array into that of type pointed to. */
8910 type = build_pointer_type (TREE_TYPE (type));
8911 type_quals = TYPE_UNQUALIFIED;
8913 else if (TREE_CODE (type) == FUNCTION_TYPE)
8914 type = build_pointer_type (type);
8920 if (decl_context == PARM)
8922 decl = cp_build_parm_decl (unqualified_id, type);
8924 bad_specifiers (decl, "parameter", virtualp,
8925 memfn_quals != TYPE_UNQUALIFIED,
8926 inlinep, friendp, raises != NULL_TREE);
8928 else if (decl_context == FIELD)
8930 /* The C99 flexible array extension. */
8931 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8932 && TYPE_DOMAIN (type) == NULL_TREE)
8934 tree itype = compute_array_index_type (dname, integer_zero_node);
8935 type = build_cplus_array_type (TREE_TYPE (type), itype);
8938 if (type == error_mark_node)
8940 /* Happens when declaring arrays of sizes which
8941 are error_mark_node, for example. */
8944 else if (in_namespace && !friendp)
8946 /* Something like struct S { int N::j; }; */
8947 error ("invalid use of %<::%>");
8948 return error_mark_node;
8950 else if (TREE_CODE (type) == FUNCTION_TYPE)
8953 tree function_context;
8957 if (ctype == NULL_TREE)
8958 ctype = current_class_type;
8960 if (ctype == NULL_TREE)
8962 error ("can't make %qD into a method -- not in a class",
8964 return error_mark_node;
8967 /* ``A union may [ ... ] not [ have ] virtual functions.''
8969 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8971 error ("function %qD declared virtual inside a union",
8973 return error_mark_node;
8976 if (NEW_DELETE_OPNAME_P (unqualified_id))
8980 error ("%qD cannot be declared virtual, since it "
8986 else if (staticp < 2)
8987 type = build_memfn_type (type, ctype, memfn_quals);
8990 /* Check that the name used for a destructor makes sense. */
8991 if (sfk == sfk_destructor)
8995 gcc_assert (friendp);
8996 error ("expected qualified name in friend declaration "
8997 "for destructor %qD",
8998 id_declarator->u.id.unqualified_name);
8999 return error_mark_node;
9002 if (!same_type_p (TREE_OPERAND
9003 (id_declarator->u.id.unqualified_name, 0),
9006 error ("declaration of %qD as member of %qT",
9007 id_declarator->u.id.unqualified_name, ctype);
9008 return error_mark_node;
9011 else if (sfk == sfk_constructor && friendp)
9013 error ("expected qualified name in friend declaration "
9014 "for constructor %qD",
9015 id_declarator->u.id.unqualified_name);
9016 return error_mark_node;
9019 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9020 function_context = (ctype != NULL_TREE) ?
9021 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9022 publicp = (! friendp || ! staticp)
9023 && function_context == NULL_TREE;
9024 decl = grokfndecl (ctype, type,
9025 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9026 ? unqualified_id : dname,
9029 virtualp, flags, memfn_quals, raises,
9030 friendp ? -1 : 0, friendp, publicp, inlinep,
9032 funcdef_flag, template_count, in_namespace,
9033 attrlist, declarator->id_loc);
9034 if (decl == NULL_TREE)
9035 return error_mark_node;
9037 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9038 /* The decl and setting of decl_attr is also turned off. */
9039 decl = build_decl_attribute_variant (decl, decl_attr);
9042 /* [class.conv.ctor]
9044 A constructor declared without the function-specifier
9045 explicit that can be called with a single parameter
9046 specifies a conversion from the type of its first
9047 parameter to the type of its class. Such a constructor
9048 is called a converting constructor. */
9050 DECL_NONCONVERTING_P (decl) = 1;
9051 else if (DECL_CONSTRUCTOR_P (decl))
9053 /* A constructor with no parms is not a conversion.
9054 Ignore any compiler-added parms. */
9055 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
9057 if (arg_types == void_list_node)
9058 DECL_NONCONVERTING_P (decl) = 1;
9061 else if (TREE_CODE (type) == METHOD_TYPE)
9063 /* We only get here for friend declarations of
9064 members of other classes. */
9065 /* All method decls are public, so tell grokfndecl to set
9066 TREE_PUBLIC, also. */
9067 decl = grokfndecl (ctype, type,
9068 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9069 ? unqualified_id : dname,
9072 virtualp, flags, memfn_quals, raises,
9073 friendp ? -1 : 0, friendp, 1, 0, sfk,
9074 funcdef_flag, template_count, in_namespace,
9076 declarator->id_loc);
9077 if (decl == NULL_TREE)
9078 return error_mark_node;
9080 else if (!staticp && !dependent_type_p (type)
9081 && !COMPLETE_TYPE_P (complete_type (type))
9082 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9085 error ("field %qD has incomplete type", unqualified_id);
9087 error ("name %qT has incomplete type", type);
9089 /* If we're instantiating a template, tell them which
9090 instantiation made the field's type be incomplete. */
9091 if (current_class_type
9092 && TYPE_NAME (current_class_type)
9093 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9095 && declspecs->type == type)
9096 error (" in instantiation of template %qT",
9097 current_class_type);
9099 return error_mark_node;
9105 error ("%qE is neither function nor member function; "
9106 "cannot be declared friend", unqualified_id);
9114 /* Friends are treated specially. */
9115 if (ctype == current_class_type)
9116 ; /* We already issued a permerror. */
9117 else if (decl && DECL_NAME (decl))
9119 if (template_class_depth (current_class_type) == 0)
9121 decl = check_explicit_specialization
9122 (unqualified_id, decl, template_count,
9123 2 * funcdef_flag + 4);
9124 if (decl == error_mark_node)
9125 return error_mark_node;
9128 decl = do_friend (ctype, unqualified_id, decl,
9134 return error_mark_node;
9137 /* Structure field. It may not be a function, except for C++. */
9139 if (decl == NULL_TREE)
9145 /* An attempt is being made to initialize a non-static
9146 member. But, from [class.mem]:
9148 4 A member-declarator can contain a
9149 constant-initializer only if it declares a static
9150 member (_class.static_) of integral or enumeration
9151 type, see _class.static.data_.
9153 This used to be relatively common practice, but
9154 the rest of the compiler does not correctly
9155 handle the initialization unless the member is
9156 static so we make it static below. */
9157 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9159 permerror (input_location, "making %qD static", unqualified_id);
9163 if (uses_template_parms (type))
9164 /* We'll check at instantiation time. */
9166 else if (check_static_variable_definition (unqualified_id,
9168 /* If we just return the declaration, crashes
9169 will sometimes occur. We therefore return
9170 void_type_node, as if this was a friend
9171 declaration, to cause callers to completely
9172 ignore this declaration. */
9173 return error_mark_node;
9178 /* C++ allows static class members. All other work
9179 for this is done by grokfield. */
9180 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9181 set_linkage_for_static_data_member (decl);
9182 /* Even if there is an in-class initialization, DECL
9183 is considered undefined until an out-of-class
9184 definition is provided. */
9185 DECL_EXTERNAL (decl) = 1;
9188 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9192 decl = build_decl (FIELD_DECL, unqualified_id, type);
9193 DECL_NONADDRESSABLE_P (decl) = bitfield;
9194 if (bitfield && !unqualified_id)
9195 TREE_NO_WARNING (decl) = 1;
9197 if (storage_class == sc_mutable)
9199 DECL_MUTABLE_P (decl) = 1;
9200 storage_class = sc_none;
9204 bad_specifiers (decl, "field", virtualp,
9205 memfn_quals != TYPE_UNQUALIFIED,
9206 inlinep, friendp, raises != NULL_TREE);
9209 else if (TREE_CODE (type) == FUNCTION_TYPE
9210 || TREE_CODE (type) == METHOD_TYPE)
9215 if (!unqualified_id)
9216 return error_mark_node;
9218 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9219 original_name = dname;
9221 original_name = unqualified_id;
9223 if (storage_class == sc_auto)
9224 error ("storage class %<auto%> invalid for function %qs", name);
9225 else if (storage_class == sc_register)
9226 error ("storage class %<register%> invalid for function %qs", name);
9228 error ("storage class %<__thread%> invalid for function %qs", name);
9230 /* Function declaration not at top level.
9231 Storage classes other than `extern' are not allowed
9232 and `extern' makes no difference. */
9233 if (! toplevel_bindings_p ()
9234 && (storage_class == sc_static
9235 || declspecs->specs[(int)ds_inline])
9238 if (storage_class == sc_static)
9239 pedwarn (input_location, OPT_pedantic,
9240 "%<static%> specified invalid for function %qs "
9241 "declared out of global scope", name);
9243 pedwarn (input_location, OPT_pedantic,
9244 "%<inline%> specifier invalid for function %qs "
9245 "declared out of global scope", name);
9248 if (ctype == NULL_TREE)
9252 error ("virtual non-class function %qs", name);
9256 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9257 && !NEW_DELETE_OPNAME_P (original_name))
9258 type = build_method_type_directly (ctype,
9260 TYPE_ARG_TYPES (type));
9262 /* Record presence of `static'. */
9263 publicp = (ctype != NULL_TREE
9264 || storage_class == sc_extern
9265 || storage_class != sc_static);
9267 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9268 virtualp, flags, memfn_quals, raises,
9270 publicp, inlinep, sfk, funcdef_flag,
9271 template_count, in_namespace, attrlist,
9272 declarator->id_loc);
9273 if (decl == NULL_TREE)
9274 return error_mark_node;
9278 int invalid_static = 0;
9280 /* Don't allow a static member function in a class, and forbid
9281 declaring main to be static. */
9282 if (TREE_CODE (type) == METHOD_TYPE)
9284 permerror (input_location, "cannot declare member function %qD to have "
9285 "static linkage", decl);
9288 else if (current_function_decl)
9290 /* FIXME need arm citation */
9291 error ("cannot declare static function inside another function");
9298 storage_class = sc_none;
9304 /* It's a variable. */
9306 /* An uninitialized decl with `extern' is a reference. */
9307 decl = grokvardecl (type, unqualified_id,
9310 (type_quals & TYPE_QUAL_CONST) != 0,
9311 ctype ? ctype : in_namespace);
9312 bad_specifiers (decl, "variable", virtualp,
9313 memfn_quals != TYPE_UNQUALIFIED,
9314 inlinep, friendp, raises != NULL_TREE);
9318 DECL_CONTEXT (decl) = ctype;
9321 permerror (input_location, "%<static%> may not be used when defining "
9322 "(as opposed to declaring) a static data member");
9324 storage_class = sc_none;
9326 if (storage_class == sc_register && TREE_STATIC (decl))
9328 error ("static member %qD declared %<register%>", decl);
9329 storage_class = sc_none;
9331 if (storage_class == sc_extern && pedantic)
9333 pedwarn (input_location, OPT_pedantic,
9334 "cannot explicitly declare member %q#D to have "
9335 "extern linkage", decl);
9336 storage_class = sc_none;
9341 if (storage_class == sc_extern && initialized && !funcdef_flag)
9343 if (toplevel_bindings_p ())
9345 /* It's common practice (and completely valid) to have a const
9346 be initialized and declared extern. */
9347 if (!(type_quals & TYPE_QUAL_CONST))
9348 warning (0, "%qs initialized and declared %<extern%>", name);
9352 error ("%qs has both %<extern%> and initializer", name);
9353 return error_mark_node;
9357 /* Record `register' declaration for warnings on &
9358 and in case doing stupid register allocation. */
9360 if (storage_class == sc_register)
9361 DECL_REGISTER (decl) = 1;
9362 else if (storage_class == sc_extern)
9363 DECL_THIS_EXTERN (decl) = 1;
9364 else if (storage_class == sc_static)
9365 DECL_THIS_STATIC (decl) = 1;
9367 /* Record constancy and volatility on the DECL itself . There's
9368 no need to do this when processing a template; we'll do this
9369 for the instantiated declaration based on the type of DECL. */
9370 if (!processing_template_decl)
9371 cp_apply_type_quals_to_decl (type_quals, decl);
9374 TREE_NO_WARNING (decl) = 1;
9380 /* Subroutine of start_function. Ensure that each of the parameter
9381 types (as listed in PARMS) is complete, as is required for a
9382 function definition. */
9385 require_complete_types_for_parms (tree parms)
9387 for (; parms; parms = TREE_CHAIN (parms))
9389 if (dependent_type_p (TREE_TYPE (parms)))
9391 if (!VOID_TYPE_P (TREE_TYPE (parms))
9392 && complete_type_or_else (TREE_TYPE (parms), parms))
9394 relayout_decl (parms);
9395 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9398 /* grokparms or complete_type_or_else will have already issued
9400 TREE_TYPE (parms) = error_mark_node;
9404 /* Returns nonzero if T is a local variable. */
9407 local_variable_p (const_tree t)
9409 if ((TREE_CODE (t) == VAR_DECL
9410 /* A VAR_DECL with a context that is a _TYPE is a static data
9412 && !TYPE_P (CP_DECL_CONTEXT (t))
9413 /* Any other non-local variable must be at namespace scope. */
9414 && !DECL_NAMESPACE_SCOPE_P (t))
9415 || (TREE_CODE (t) == PARM_DECL))
9421 /* Like local_variable_p, but suitable for use as a tree-walking
9425 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9426 void *data ATTRIBUTE_UNUSED)
9428 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9430 else if (TYPE_P (*tp))
9437 /* Check that ARG, which is a default-argument expression for a
9438 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9439 something goes wrong. DECL may also be a _TYPE node, rather than a
9440 DECL, if there is no DECL available. */
9443 check_default_argument (tree decl, tree arg)
9448 if (TREE_CODE (arg) == DEFAULT_ARG)
9449 /* We get a DEFAULT_ARG when looking at an in-class declaration
9450 with a default argument. Ignore the argument for now; we'll
9451 deal with it after the class is complete. */
9460 decl_type = TREE_TYPE (decl);
9462 if (arg == error_mark_node
9463 || decl == error_mark_node
9464 || TREE_TYPE (arg) == error_mark_node
9465 || decl_type == error_mark_node)
9466 /* Something already went wrong. There's no need to check
9468 return error_mark_node;
9470 /* [dcl.fct.default]
9472 A default argument expression is implicitly converted to the
9474 if (!TREE_TYPE (arg)
9475 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9478 error ("default argument for %q#D has type %qT",
9479 decl, TREE_TYPE (arg));
9481 error ("default argument for parameter of type %qT has type %qT",
9482 decl_type, TREE_TYPE (arg));
9484 return error_mark_node;
9487 /* [dcl.fct.default]
9489 Local variables shall not be used in default argument
9492 The keyword `this' shall not be used in a default argument of a
9494 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9497 error ("default argument %qE uses local variable %qD", arg, var);
9498 return error_mark_node;
9505 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9508 type_is_deprecated (tree type)
9510 enum tree_code code;
9511 if (TREE_DEPRECATED (type))
9513 if (TYPE_NAME (type)
9514 && TREE_DEPRECATED (TYPE_NAME (type)))
9517 code = TREE_CODE (type);
9519 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9520 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9521 || code == METHOD_TYPE || code == ARRAY_TYPE)
9522 return type_is_deprecated (TREE_TYPE (type));
9524 if (TYPE_PTRMEMFUNC_P (type))
9525 return type_is_deprecated
9526 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9531 /* Decode the list of parameter types for a function type.
9532 Given the list of things declared inside the parens,
9533 return a list of types.
9535 If this parameter does not end with an ellipsis, we append
9538 *PARMS is set to the chain of PARM_DECLs created. */
9541 grokparms (tree parmlist, tree *parms)
9543 tree result = NULL_TREE;
9544 tree decls = NULL_TREE;
9548 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9550 tree type = NULL_TREE;
9551 tree init = TREE_PURPOSE (parm);
9552 tree decl = TREE_VALUE (parm);
9554 if (parm == void_list_node)
9557 if (! decl || TREE_TYPE (decl) == error_mark_node)
9560 type = TREE_TYPE (decl);
9561 if (VOID_TYPE_P (type))
9563 if (same_type_p (type, void_type_node)
9564 && DECL_SELF_REFERENCE_P (type)
9565 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9566 /* this is a parmlist of `(void)', which is ok. */
9568 cxx_incomplete_type_error (decl, type);
9569 /* It's not a good idea to actually create parameters of
9570 type `void'; other parts of the compiler assume that a
9571 void type terminates the parameter list. */
9572 type = error_mark_node;
9573 TREE_TYPE (decl) = error_mark_node;
9576 if (type != error_mark_node
9577 && TYPE_FOR_JAVA (type)
9578 && MAYBE_CLASS_TYPE_P (type))
9580 error ("parameter %qD has Java class type", decl);
9581 type = error_mark_node;
9582 TREE_TYPE (decl) = error_mark_node;
9586 if (type != error_mark_node)
9588 if (deprecated_state != DEPRECATED_SUPPRESS)
9590 tree deptype = type_is_deprecated (type);
9592 warn_deprecated_use (deptype);
9595 /* Top-level qualifiers on the parameters are
9596 ignored for function types. */
9597 type = cp_build_qualified_type (type, 0);
9598 if (TREE_CODE (type) == METHOD_TYPE)
9600 error ("parameter %qD invalidly declared method type", decl);
9601 type = build_pointer_type (type);
9602 TREE_TYPE (decl) = type;
9604 else if (abstract_virtuals_error (decl, type))
9605 any_error = 1; /* Seems like a good idea. */
9606 else if (POINTER_TYPE_P (type))
9608 /* [dcl.fct]/6, parameter types cannot contain pointers
9609 (references) to arrays of unknown bound. */
9610 tree t = TREE_TYPE (type);
9611 int ptr = TYPE_PTR_P (type);
9617 else if (TREE_CODE (t) != ARRAY_TYPE)
9619 else if (!TYPE_DOMAIN (t))
9623 if (TREE_CODE (t) == ARRAY_TYPE)
9624 error ("parameter %qD includes %s to array of unknown "
9626 decl, ptr ? "pointer" : "reference", t);
9631 else if (init && !processing_template_decl)
9632 init = check_default_argument (decl, init);
9635 if (TREE_CODE (decl) == PARM_DECL
9636 && FUNCTION_PARAMETER_PACK_P (decl)
9637 && TREE_CHAIN (parm)
9638 && TREE_CHAIN (parm) != void_list_node)
9639 error ("parameter packs must be at the end of the parameter list");
9641 TREE_CHAIN (decl) = decls;
9643 result = tree_cons (init, type, result);
9645 decls = nreverse (decls);
9646 result = nreverse (result);
9648 result = chainon (result, void_list_node);
9655 /* D is a constructor or overloaded `operator='.
9657 Let T be the class in which D is declared. Then, this function
9660 -1 if D's is an ill-formed constructor or copy assignment operator
9661 whose first parameter is of type `T'.
9662 0 if D is not a copy constructor or copy assignment
9664 1 if D is a copy constructor or copy assignment operator whose
9665 first parameter is a reference to const qualified T.
9666 2 if D is a copy constructor or copy assignment operator whose
9667 first parameter is a reference to non-const qualified T.
9669 This function can be used as a predicate. Positive values indicate
9670 a copy constructor and nonzero values indicate a copy assignment
9674 copy_fn_p (const_tree d)
9680 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9682 if (TREE_CODE (d) == TEMPLATE_DECL
9683 || (DECL_TEMPLATE_INFO (d)
9684 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9685 /* Instantiations of template member functions are never copy
9686 functions. Note that member functions of templated classes are
9687 represented as template functions internally, and we must
9688 accept those as copy functions. */
9691 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9695 arg_type = TREE_VALUE (args);
9696 if (arg_type == error_mark_node)
9699 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9701 /* Pass by value copy assignment operator. */
9704 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9705 && !TYPE_REF_IS_RVALUE (arg_type)
9706 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9708 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9714 args = TREE_CHAIN (args);
9716 if (args && args != void_list_node && !TREE_PURPOSE (args))
9717 /* There are more non-optional args. */
9723 /* D is a constructor or overloaded `operator='.
9725 Let T be the class in which D is declared. Then, this function
9726 returns true when D is a move constructor or move assignment
9727 operator, false otherwise. */
9730 move_fn_p (const_tree d)
9734 bool result = false;
9736 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9738 if (cxx_dialect == cxx98)
9739 /* There are no move constructors if we are in C++98 mode. */
9742 if (TREE_CODE (d) == TEMPLATE_DECL
9743 || (DECL_TEMPLATE_INFO (d)
9744 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9745 /* Instantiations of template member functions are never copy
9746 functions. Note that member functions of templated classes are
9747 represented as template functions internally, and we must
9748 accept those as copy functions. */
9751 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9755 arg_type = TREE_VALUE (args);
9756 if (arg_type == error_mark_node)
9759 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9760 && TYPE_REF_IS_RVALUE (arg_type)
9761 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9765 args = TREE_CHAIN (args);
9767 if (args && args != void_list_node && !TREE_PURPOSE (args))
9768 /* There are more non-optional args. */
9774 /* Remember any special properties of member function DECL. */
9777 grok_special_member_properties (tree decl)
9781 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9784 class_type = DECL_CONTEXT (decl);
9785 if (DECL_CONSTRUCTOR_P (decl))
9787 int ctor = copy_fn_p (decl);
9789 if (!DECL_ARTIFICIAL (decl))
9790 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9796 A non-template constructor for class X is a copy
9797 constructor if its first parameter is of type X&, const
9798 X&, volatile X& or const volatile X&, and either there
9799 are no other parameters or else all other parameters have
9800 default arguments. */
9801 TYPE_HAS_INIT_REF (class_type) = 1;
9802 if (!DECL_DEFAULTED_FN (decl))
9803 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9805 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9807 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9808 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9809 else if (is_list_ctor (decl))
9810 TYPE_HAS_LIST_CTOR (class_type) = 1;
9812 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9816 A non-template assignment operator for class X is a copy
9817 assignment operator if its parameter is of type X, X&, const
9818 X&, volatile X& or const volatile X&. */
9820 int assop = copy_fn_p (decl);
9824 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9825 if (!DECL_DEFAULTED_FN (decl))
9826 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9828 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9833 /* Check a constructor DECL has the correct form. Complains
9834 if the class has a constructor of the form X(X). */
9837 grok_ctor_properties (const_tree ctype, const_tree decl)
9839 int ctor_parm = copy_fn_p (decl);
9845 A declaration of a constructor for a class X is ill-formed if
9846 its first parameter is of type (optionally cv-qualified) X
9847 and either there are no other parameters or else all other
9848 parameters have default arguments.
9850 We *don't* complain about member template instantiations that
9851 have this form, though; they can occur as we try to decide
9852 what constructor to use during overload resolution. Since
9853 overload resolution will never prefer such a constructor to
9854 the non-template copy constructor (which is either explicitly
9855 or implicitly defined), there's no need to worry about their
9856 existence. Theoretically, they should never even be
9857 instantiated, but that's hard to forestall. */
9858 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9866 /* An operator with this code is unary, but can also be binary. */
9869 ambi_op_p (enum tree_code code)
9871 return (code == INDIRECT_REF
9872 || code == ADDR_EXPR
9873 || code == UNARY_PLUS_EXPR
9874 || code == NEGATE_EXPR
9875 || code == PREINCREMENT_EXPR
9876 || code == PREDECREMENT_EXPR);
9879 /* An operator with this name can only be unary. */
9882 unary_op_p (enum tree_code code)
9884 return (code == TRUTH_NOT_EXPR
9885 || code == BIT_NOT_EXPR
9886 || code == COMPONENT_REF
9887 || code == TYPE_EXPR);
9890 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9891 errors are issued for invalid declarations. */
9894 grok_op_properties (tree decl, bool complain)
9896 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9898 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9899 tree name = DECL_NAME (decl);
9900 enum tree_code operator_code;
9905 /* Count the number of arguments and check for ellipsis. */
9906 for (argtype = argtypes, arity = 0;
9907 argtype && argtype != void_list_node;
9908 argtype = TREE_CHAIN (argtype))
9910 ellipsis_p = !argtype;
9912 class_type = DECL_CONTEXT (decl);
9913 if (class_type && !CLASS_TYPE_P (class_type))
9914 class_type = NULL_TREE;
9916 if (DECL_CONV_FN_P (decl))
9917 operator_code = TYPE_EXPR;
9921 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9922 if (ansi_opname (CODE) == name) \
9924 operator_code = (CODE); \
9927 else if (ansi_assopname (CODE) == name) \
9929 operator_code = (CODE); \
9930 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9934 #include "operators.def"
9940 gcc_assert (operator_code != MAX_TREE_CODES);
9941 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9944 switch (operator_code)
9947 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9951 TYPE_GETS_DELETE (class_type) |= 1;
9955 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9958 case VEC_DELETE_EXPR:
9959 TYPE_GETS_DELETE (class_type) |= 2;
9966 /* [basic.std.dynamic.allocation]/1:
9968 A program is ill-formed if an allocation function is declared
9969 in a namespace scope other than global scope or declared static
9972 The same also holds true for deallocation functions. */
9973 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9974 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9976 if (DECL_NAMESPACE_SCOPE_P (decl))
9978 if (CP_DECL_CONTEXT (decl) != global_namespace)
9980 error ("%qD may not be declared within a namespace", decl);
9983 else if (!TREE_PUBLIC (decl))
9985 error ("%qD may not be declared as static", decl);
9991 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9993 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9994 DECL_IS_OPERATOR_NEW (decl) = 1;
9996 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9997 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10000 /* An operator function must either be a non-static member function
10001 or have at least one parameter of a class, a reference to a class,
10002 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10003 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10005 if (operator_code == TYPE_EXPR
10006 || operator_code == CALL_EXPR
10007 || operator_code == COMPONENT_REF
10008 || operator_code == ARRAY_REF
10009 || operator_code == NOP_EXPR)
10011 error ("%qD must be a nonstatic member function", decl);
10018 if (DECL_STATIC_FUNCTION_P (decl))
10020 error ("%qD must be either a non-static member "
10021 "function or a non-member function", decl);
10025 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10027 tree arg = non_reference (TREE_VALUE (p));
10028 if (arg == error_mark_node)
10031 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10032 because these checks are performed even on
10033 template functions. */
10034 if (MAYBE_CLASS_TYPE_P (arg)
10035 || TREE_CODE (arg) == ENUMERAL_TYPE)
10039 if (!p || p == void_list_node)
10042 error ("%qD must have an argument of class or "
10043 "enumerated type", decl);
10049 /* There are no restrictions on the arguments to an overloaded
10051 if (operator_code == CALL_EXPR)
10054 /* Warn about conversion operators that will never be used. */
10055 if (IDENTIFIER_TYPENAME_P (name)
10056 && ! DECL_TEMPLATE_INFO (decl)
10058 /* Warn only declaring the function; there is no need to
10059 warn again about out-of-class definitions. */
10060 && class_type == current_class_type)
10062 tree t = TREE_TYPE (name);
10063 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10064 const char *what = 0;
10067 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10069 if (TREE_CODE (t) == VOID_TYPE)
10071 else if (class_type)
10073 if (t == class_type)
10074 what = "the same type";
10075 /* Don't force t to be complete here. */
10076 else if (MAYBE_CLASS_TYPE_P (t)
10077 && COMPLETE_TYPE_P (t)
10078 && DERIVED_FROM_P (t, class_type))
10079 what = "a base class";
10083 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10084 "conversion operator",
10085 ref ? "a reference to " : "", what);
10088 if (operator_code == COND_EXPR)
10091 error ("ISO C++ prohibits overloading operator ?:");
10094 else if (ellipsis_p)
10096 error ("%qD must not have variable number of arguments", decl);
10099 else if (ambi_op_p (operator_code))
10102 /* We pick the one-argument operator codes by default, so
10103 we don't have to change anything. */
10105 else if (arity == 2)
10107 /* If we thought this was a unary operator, we now know
10108 it to be a binary operator. */
10109 switch (operator_code)
10112 operator_code = MULT_EXPR;
10116 operator_code = BIT_AND_EXPR;
10119 case UNARY_PLUS_EXPR:
10120 operator_code = PLUS_EXPR;
10124 operator_code = MINUS_EXPR;
10127 case PREINCREMENT_EXPR:
10128 operator_code = POSTINCREMENT_EXPR;
10131 case PREDECREMENT_EXPR:
10132 operator_code = POSTDECREMENT_EXPR;
10136 gcc_unreachable ();
10139 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10141 if ((operator_code == POSTINCREMENT_EXPR
10142 || operator_code == POSTDECREMENT_EXPR)
10143 && ! processing_template_decl
10144 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10147 error ("postfix %qD must take %<int%> as its argument",
10150 error ("postfix %qD must take %<int%> as its second "
10158 error ("%qD must take either zero or one argument", decl);
10160 error ("%qD must take either one or two arguments", decl);
10164 /* More Effective C++ rule 6. */
10166 && (operator_code == POSTINCREMENT_EXPR
10167 || operator_code == POSTDECREMENT_EXPR
10168 || operator_code == PREINCREMENT_EXPR
10169 || operator_code == PREDECREMENT_EXPR))
10171 tree arg = TREE_VALUE (argtypes);
10172 tree ret = TREE_TYPE (TREE_TYPE (decl));
10173 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10174 arg = TREE_TYPE (arg);
10175 arg = TYPE_MAIN_VARIANT (arg);
10176 if (operator_code == PREINCREMENT_EXPR
10177 || operator_code == PREDECREMENT_EXPR)
10179 if (TREE_CODE (ret) != REFERENCE_TYPE
10180 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10182 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10183 build_reference_type (arg));
10187 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10188 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10192 else if (unary_op_p (operator_code))
10197 error ("%qD must take %<void%>", decl);
10199 error ("%qD must take exactly one argument", decl);
10203 else /* if (binary_op_p (operator_code)) */
10208 error ("%qD must take exactly one argument", decl);
10210 error ("%qD must take exactly two arguments", decl);
10214 /* More Effective C++ rule 7. */
10216 && (operator_code == TRUTH_ANDIF_EXPR
10217 || operator_code == TRUTH_ORIF_EXPR
10218 || operator_code == COMPOUND_EXPR))
10219 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10223 /* Effective C++ rule 23. */
10226 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10227 && (operator_code == PLUS_EXPR
10228 || operator_code == MINUS_EXPR
10229 || operator_code == TRUNC_DIV_EXPR
10230 || operator_code == MULT_EXPR
10231 || operator_code == TRUNC_MOD_EXPR)
10232 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10233 warning (OPT_Weffc__, "%qD should return by value", decl);
10235 /* [over.oper]/8 */
10236 for (; argtypes && argtypes != void_list_node;
10237 argtypes = TREE_CHAIN (argtypes))
10238 if (TREE_PURPOSE (argtypes))
10240 TREE_PURPOSE (argtypes) = NULL_TREE;
10241 if (operator_code == POSTINCREMENT_EXPR
10242 || operator_code == POSTDECREMENT_EXPR)
10244 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10249 error ("%qD cannot have default arguments", decl);
10257 /* Return a string giving the keyword associate with CODE. */
10259 static const char *
10260 tag_name (enum tag_types code)
10272 case typename_type:
10275 gcc_unreachable ();
10279 /* Name lookup in an elaborated-type-specifier (after the keyword
10280 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10281 elaborated-type-specifier is invalid, issue a diagnostic and return
10282 error_mark_node; otherwise, return the *_TYPE to which it referred.
10283 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10286 check_elaborated_type_specifier (enum tag_types tag_code,
10288 bool allow_template_p)
10294 struct S { struct S *p; };
10296 name lookup will find the TYPE_DECL for the implicit "S::S"
10297 typedef. Adjust for that here. */
10298 if (DECL_SELF_REFERENCE_P (decl))
10299 decl = TYPE_NAME (TREE_TYPE (decl));
10301 type = TREE_TYPE (decl);
10303 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10304 is false for this case as well. */
10305 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10307 error ("using template type parameter %qT after %qs",
10308 type, tag_name (tag_code));
10309 return error_mark_node;
10313 If the identifier resolves to a typedef-name or a template
10314 type-parameter, the elaborated-type-specifier is ill-formed.
10316 In other words, the only legitimate declaration to use in the
10317 elaborated type specifier is the implicit typedef created when
10318 the type is declared. */
10319 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10320 && tag_code != typename_type)
10322 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10323 error ("%q+D has a previous declaration here", decl);
10324 return error_mark_node;
10326 else if (TREE_CODE (type) != RECORD_TYPE
10327 && TREE_CODE (type) != UNION_TYPE
10328 && tag_code != enum_type
10329 && tag_code != typename_type)
10331 error ("%qT referred to as %qs", type, tag_name (tag_code));
10332 error ("%q+T has a previous declaration here", type);
10333 return error_mark_node;
10335 else if (TREE_CODE (type) != ENUMERAL_TYPE
10336 && tag_code == enum_type)
10338 error ("%qT referred to as enum", type);
10339 error ("%q+T has a previous declaration here", type);
10340 return error_mark_node;
10342 else if (!allow_template_p
10343 && TREE_CODE (type) == RECORD_TYPE
10344 && CLASSTYPE_IS_TEMPLATE (type))
10346 /* If a class template appears as elaborated type specifier
10347 without a template header such as:
10349 template <class T> class C {};
10350 void f(class C); // No template header here
10352 then the required template argument is missing. */
10353 error ("template argument required for %<%s %T%>",
10354 tag_name (tag_code),
10355 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10356 return error_mark_node;
10362 /* Lookup NAME in elaborate type specifier in scope according to
10363 SCOPE and issue diagnostics if necessary.
10364 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10365 found, and ERROR_MARK_NODE for type error. */
10368 lookup_and_check_tag (enum tag_types tag_code, tree name,
10369 tag_scope scope, bool template_header_p)
10373 if (scope == ts_global)
10375 /* First try ordinary name lookup, ignoring hidden class name
10376 injected via friend declaration. */
10377 decl = lookup_name_prefer_type (name, 2);
10378 /* If that fails, the name will be placed in the smallest
10379 non-class, non-function-prototype scope according to 3.3.1/5.
10380 We may already have a hidden name declared as friend in this
10381 scope. So lookup again but not ignoring hidden names.
10382 If we find one, that name will be made visible rather than
10383 creating a new tag. */
10385 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10388 decl = lookup_type_scope (name, scope);
10390 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10391 decl = DECL_TEMPLATE_RESULT (decl);
10393 if (decl && TREE_CODE (decl) == TYPE_DECL)
10395 /* Look for invalid nested type:
10399 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10401 error ("%qD has the same name as the class in which it is "
10404 return error_mark_node;
10407 /* Two cases we need to consider when deciding if a class
10408 template is allowed as an elaborated type specifier:
10409 1. It is a self reference to its own class.
10410 2. It comes with a template header.
10414 template <class T> class C {
10415 class C *c1; // DECL_SELF_REFERENCE_P is true
10418 template <class U> class C; // template_header_p is true
10419 template <class T> class C<T>::D {
10420 class C *c2; // DECL_SELF_REFERENCE_P is true
10423 t = check_elaborated_type_specifier (tag_code,
10426 | DECL_SELF_REFERENCE_P (decl));
10429 else if (decl && TREE_CODE (decl) == TREE_LIST)
10431 error ("reference to %qD is ambiguous", name);
10432 print_candidates (decl);
10433 return error_mark_node;
10439 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10440 Define the tag as a forward-reference if it is not defined.
10442 If a declaration is given, process it here, and report an error if
10443 multiple declarations are not identical.
10445 SCOPE is TS_CURRENT when this is also a definition. Only look in
10446 the current frame for the name (since C++ allows new names in any
10447 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10448 declaration. Only look beginning from the current scope outward up
10449 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10451 TEMPLATE_HEADER_P is true when this declaration is preceded by
10452 a set of template parameters. */
10455 xref_tag (enum tag_types tag_code, tree name,
10456 tag_scope scope, bool template_header_p)
10458 enum tree_code code;
10460 tree context = NULL_TREE;
10462 timevar_push (TV_NAME_LOOKUP);
10464 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10470 code = RECORD_TYPE;
10476 code = ENUMERAL_TYPE;
10479 gcc_unreachable ();
10482 /* In case of anonymous name, xref_tag is only called to
10483 make type node and push name. Name lookup is not required. */
10484 if (ANON_AGGRNAME_P (name))
10487 t = lookup_and_check_tag (tag_code, name,
10488 scope, template_header_p);
10490 if (t == error_mark_node)
10491 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10493 if (scope != ts_current && t && current_class_type
10494 && template_class_depth (current_class_type)
10495 && template_header_p)
10497 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10498 definition of this tag. Since, in addition, we are currently
10499 processing a (member) template declaration of a template
10500 class, we must be very careful; consider:
10507 { template <class V>
10508 friend struct S1; };
10510 Here, the S2::S1 declaration should not be confused with the
10511 outer declaration. In particular, the inner version should
10512 have a template parameter of level 2, not level 1. This
10513 would be particularly important if the member declaration
10516 template <class V = U> friend struct S1;
10518 say, when we should tsubst into `U' when instantiating
10519 S2. On the other hand, when presented with:
10529 we must find the inner binding eventually. We
10530 accomplish this by making sure that the new type we
10531 create to represent this declaration has the right
10533 context = TYPE_CONTEXT (t);
10539 /* If no such tag is yet defined, create a forward-reference node
10540 and record it as the "definition".
10541 When a real declaration of this type is found,
10542 the forward-reference will be altered into a real type. */
10543 if (code == ENUMERAL_TYPE)
10545 error ("use of enum %q#D without previous declaration", name);
10546 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10550 t = make_class_type (code);
10551 TYPE_CONTEXT (t) = context;
10552 t = pushtag (name, t, scope);
10557 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10559 if (!redeclare_class_template (t, current_template_parms))
10560 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10562 else if (!processing_template_decl
10563 && CLASS_TYPE_P (t)
10564 && CLASSTYPE_IS_TEMPLATE (t))
10566 error ("redeclaration of %qT as a non-template", t);
10567 error ("previous declaration %q+D", t);
10568 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10571 /* Make injected friend class visible. */
10572 if (scope != ts_within_enclosing_non_class
10573 && hidden_name_p (TYPE_NAME (t)))
10575 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10576 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10578 if (TYPE_TEMPLATE_INFO (t))
10580 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10581 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10586 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10590 xref_tag_from_type (tree old, tree id, tag_scope scope)
10592 enum tag_types tag_kind;
10594 if (TREE_CODE (old) == RECORD_TYPE)
10595 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10597 tag_kind = union_type;
10599 if (id == NULL_TREE)
10600 id = TYPE_IDENTIFIER (old);
10602 return xref_tag (tag_kind, id, scope, false);
10605 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10606 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10607 access_* node, and the TREE_VALUE is the type of the base-class.
10608 Non-NULL TREE_TYPE indicates virtual inheritance.
10610 Returns true if the binfo hierarchy was successfully created,
10611 false if an error was detected. */
10614 xref_basetypes (tree ref, tree base_list)
10617 tree binfo, base_binfo;
10618 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10619 unsigned max_bases = 0; /* Maximum direct bases. */
10621 tree default_access;
10622 tree igo_prev; /* Track Inheritance Graph Order. */
10624 if (ref == error_mark_node)
10627 /* The base of a derived class is private by default, all others are
10629 default_access = (TREE_CODE (ref) == RECORD_TYPE
10630 && CLASSTYPE_DECLARED_CLASS (ref)
10631 ? access_private_node : access_public_node);
10633 /* First, make sure that any templates in base-classes are
10634 instantiated. This ensures that if we call ourselves recursively
10635 we do not get confused about which classes are marked and which
10637 basep = &base_list;
10640 tree basetype = TREE_VALUE (*basep);
10642 if (!(processing_template_decl && uses_template_parms (basetype))
10643 && !complete_type_or_else (basetype, NULL))
10644 /* An incomplete type. Remove it from the list. */
10645 *basep = TREE_CHAIN (*basep);
10649 if (TREE_TYPE (*basep))
10651 if (CLASS_TYPE_P (basetype))
10652 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10653 basep = &TREE_CHAIN (*basep);
10657 TYPE_MARKED_P (ref) = 1;
10659 /* The binfo slot should be empty, unless this is an (ill-formed)
10661 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10662 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10664 binfo = make_tree_binfo (max_bases);
10666 TYPE_BINFO (ref) = binfo;
10667 BINFO_OFFSET (binfo) = size_zero_node;
10668 BINFO_TYPE (binfo) = ref;
10672 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10673 /* An aggregate cannot have baseclasses. */
10674 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10676 if (TREE_CODE (ref) == UNION_TYPE)
10678 error ("derived union %qT invalid", ref);
10685 if (TYPE_FOR_JAVA (ref))
10687 error ("Java class %qT cannot have multiple bases", ref);
10694 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10696 if (TYPE_FOR_JAVA (ref))
10698 error ("Java class %qT cannot have virtual bases", ref);
10703 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10705 tree access = TREE_PURPOSE (base_list);
10706 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10707 tree basetype = TREE_VALUE (base_list);
10709 if (access == access_default_node)
10710 access = default_access;
10712 if (PACK_EXPANSION_P (basetype))
10713 basetype = PACK_EXPANSION_PATTERN (basetype);
10714 if (TREE_CODE (basetype) == TYPE_DECL)
10715 basetype = TREE_TYPE (basetype);
10716 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10718 error ("base type %qT fails to be a struct or class type",
10723 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10724 TYPE_FOR_JAVA (ref) = 1;
10726 base_binfo = NULL_TREE;
10727 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10729 base_binfo = TYPE_BINFO (basetype);
10730 /* The original basetype could have been a typedef'd type. */
10731 basetype = BINFO_TYPE (base_binfo);
10733 /* Inherit flags from the base. */
10734 TYPE_HAS_NEW_OPERATOR (ref)
10735 |= TYPE_HAS_NEW_OPERATOR (basetype);
10736 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10737 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10738 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10739 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10740 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10741 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10742 CLASSTYPE_REPEATED_BASE_P (ref)
10743 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10746 /* We must do this test after we've seen through a typedef
10748 if (TYPE_MARKED_P (basetype))
10750 if (basetype == ref)
10751 error ("recursive type %qT undefined", basetype);
10753 error ("duplicate base type %qT invalid", basetype);
10757 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10758 /* Regenerate the pack expansion for the bases. */
10759 basetype = make_pack_expansion (basetype);
10761 TYPE_MARKED_P (basetype) = 1;
10763 base_binfo = copy_binfo (base_binfo, basetype, ref,
10764 &igo_prev, via_virtual);
10765 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10766 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10768 BINFO_BASE_APPEND (binfo, base_binfo);
10769 BINFO_BASE_ACCESS_APPEND (binfo, access);
10772 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10773 /* If we have space in the vbase vector, we must have shared at
10774 least one of them, and are therefore diamond shaped. */
10775 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10777 /* Unmark all the types. */
10778 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10779 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10780 TYPE_MARKED_P (ref) = 0;
10782 /* Now see if we have a repeated base type. */
10783 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10785 for (base_binfo = binfo; base_binfo;
10786 base_binfo = TREE_CHAIN (base_binfo))
10788 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10790 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10793 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10795 for (base_binfo = binfo; base_binfo;
10796 base_binfo = TREE_CHAIN (base_binfo))
10797 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10798 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10807 /* Begin compiling the definition of an enumeration type.
10810 UNDERLYING_TYPE is the type that will be used as the storage for
10811 the enumeration type. This should be NULL_TREE if no storage type
10814 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10816 Returns the type object, as yet incomplete.
10817 Also records info about it so that build_enumerator
10818 may be used to declare the individual values as they are read. */
10821 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10825 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10827 /* If this is the real definition for a previous forward reference,
10828 fill in the contents in the same object that used to be the
10829 forward reference. */
10831 enumtype = lookup_and_check_tag (enum_type, name,
10832 /*tag_scope=*/ts_current,
10833 /*template_header_p=*/false);
10835 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10837 error ("multiple definition of %q#T", enumtype);
10838 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10839 /* Clear out TYPE_VALUES, and start again. */
10840 TYPE_VALUES (enumtype) = NULL_TREE;
10844 /* In case of error, make a dummy enum to allow parsing to
10846 if (enumtype == error_mark_node)
10847 name = make_anon_name ();
10849 enumtype = make_node (ENUMERAL_TYPE);
10850 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10855 SET_SCOPED_ENUM_P (enumtype, 1);
10856 begin_scope (sk_scoped_enum, enumtype);
10858 /* [C++0x dcl.enum]p5:
10860 If not explicitly specified, the underlying type of a scoped
10861 enumeration type is int. */
10862 if (!underlying_type)
10863 underlying_type = integer_type_node;
10866 if (underlying_type)
10868 if (CP_INTEGRAL_TYPE_P (underlying_type))
10870 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10871 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10872 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10873 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10874 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10875 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10876 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10877 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10878 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10879 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10882 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10883 underlying_type, enumtype);
10889 /* After processing and defining all the values of an enumeration type,
10890 install their decls in the enumeration type and finish it off.
10891 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10894 finish_enum (tree enumtype)
10903 bool use_short_enum;
10907 integer_type_kind itk;
10908 tree underlying_type = NULL_TREE;
10909 bool fixed_underlying_type_p
10910 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
10912 /* We built up the VALUES in reverse order. */
10913 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10915 /* For an enum defined in a template, just set the type of the values;
10916 all further processing is postponed until the template is
10917 instantiated. We need to set the type so that tsubst of a CONST_DECL
10919 if (processing_template_decl)
10921 for (values = TYPE_VALUES (enumtype);
10923 values = TREE_CHAIN (values))
10924 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10925 if (at_function_scope_p ())
10926 add_stmt (build_min (TAG_DEFN, enumtype));
10930 /* Determine the minimum and maximum values of the enumerators. */
10931 if (TYPE_VALUES (enumtype))
10933 minnode = maxnode = NULL_TREE;
10935 for (values = TYPE_VALUES (enumtype);
10937 values = TREE_CHAIN (values))
10939 decl = TREE_VALUE (values);
10941 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10942 each enumerator has the type of its enumeration. Prior to the
10943 closing brace, the type of each enumerator is the type of its
10944 initializing value. */
10945 TREE_TYPE (decl) = enumtype;
10947 /* Update the minimum and maximum values, if appropriate. */
10948 value = DECL_INITIAL (decl);
10949 if (value == error_mark_node)
10950 value = integer_zero_node;
10951 /* Figure out what the minimum and maximum values of the
10952 enumerators are. */
10954 minnode = maxnode = value;
10955 else if (tree_int_cst_lt (maxnode, value))
10957 else if (tree_int_cst_lt (value, minnode))
10964 If the enumerator-list is empty, the underlying type is as if
10965 the enumeration had a single enumerator with value 0. */
10966 minnode = maxnode = integer_zero_node;
10968 /* Compute the number of bits require to represent all values of the
10969 enumeration. We must do this before the type of MINNODE and
10970 MAXNODE are transformed, since min_precision relies on the
10971 TREE_TYPE of the value it is passed. */
10972 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10973 lowprec = min_precision (minnode, unsignedp);
10974 highprec = min_precision (maxnode, unsignedp);
10975 precision = MAX (lowprec, highprec);
10977 if (!fixed_underlying_type_p)
10979 /* Determine the underlying type of the enumeration.
10983 The underlying type of an enumeration is an integral type that
10984 can represent all the enumerator values defined in the
10985 enumeration. It is implementation-defined which integral type is
10986 used as the underlying type for an enumeration except that the
10987 underlying type shall not be larger than int unless the value of
10988 an enumerator cannot fit in an int or unsigned int.
10990 We use "int" or an "unsigned int" as the underlying type, even if
10991 a smaller integral type would work, unless the user has
10992 explicitly requested that we use the smallest possible type. The
10993 user can request that for all enumerations with a command line
10994 flag, or for just one enumeration with an attribute. */
10996 use_short_enum = flag_short_enums
10997 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10999 for (itk = (use_short_enum ? itk_char : itk_int);
11003 underlying_type = integer_types[itk];
11004 if (TYPE_PRECISION (underlying_type) >= precision
11005 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11008 if (itk == itk_none)
11012 IF no integral type can represent all the enumerator values, the
11013 enumeration is ill-formed. */
11014 error ("no integral type can represent all of the enumerator values "
11015 "for %qT", enumtype);
11016 precision = TYPE_PRECISION (long_long_integer_type_node);
11017 underlying_type = integer_types[itk_unsigned_long_long];
11022 The value of sizeof() applied to an enumeration type, an object
11023 of an enumeration type, or an enumerator, is the value of sizeof()
11024 applied to the underlying type. */
11025 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11026 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11027 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
11028 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11029 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11030 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11032 /* Set the underlying type of the enumeration type to the
11033 computed enumeration type, restricted to the enumerator
11035 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
11036 set_min_and_max_values_for_integral_type
11037 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11040 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11042 /* Compute the minimum and maximum values for the type.
11046 For an enumeration where emin is the smallest enumerator and emax
11047 is the largest, the values of the enumeration are the values of the
11048 underlying type in the range bmin to bmax, where bmin and bmax are,
11049 respectively, the smallest and largest values of the smallest bit-
11050 field that can store emin and emax. */
11052 /* The middle-end currently assumes that types with TYPE_PRECISION
11053 narrower than their underlying type are suitably zero or sign
11054 extended to fill their mode. g++ doesn't make these guarantees.
11055 Until the middle-end can represent such paradoxical types, we
11056 set the TYPE_PRECISION to the width of the underlying type. */
11057 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11059 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11061 /* Convert each of the enumerators to the type of the underlying
11062 type of the enumeration. */
11063 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11065 location_t saved_location;
11067 decl = TREE_VALUE (values);
11068 saved_location = input_location;
11069 input_location = DECL_SOURCE_LOCATION (decl);
11070 if (fixed_underlying_type_p)
11071 /* If the enumeration type has a fixed underlying type, we
11072 already checked all of the enumerator values. */
11073 value = DECL_INITIAL (decl);
11075 value = perform_implicit_conversion (underlying_type,
11076 DECL_INITIAL (decl),
11077 tf_warning_or_error);
11078 input_location = saved_location;
11080 /* Do not clobber shared ints. */
11081 value = copy_node (value);
11083 TREE_TYPE (value) = enumtype;
11084 DECL_INITIAL (decl) = value;
11087 /* Fix up all variant types of this enum type. */
11088 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11090 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11091 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11092 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11093 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11094 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11095 TYPE_MODE (t) = TYPE_MODE (enumtype);
11096 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11097 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11098 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11099 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11100 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11103 /* Finish up the scope of a scoped enumeration. */
11104 if (SCOPED_ENUM_P (enumtype))
11107 /* Finish debugging output for this type. */
11108 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11111 /* Build and install a CONST_DECL for an enumeration constant of the
11112 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11113 Assignment of sequential values by default is handled here. */
11116 build_enumerator (tree name, tree value, tree enumtype)
11122 /* If the VALUE was erroneous, pretend it wasn't there; that will
11123 result in the enum being assigned the next value in sequence. */
11124 if (value == error_mark_node)
11127 /* Remove no-op casts from the value. */
11129 STRIP_TYPE_NOPS (value);
11131 if (! processing_template_decl)
11133 /* Validate and default VALUE. */
11134 if (value != NULL_TREE)
11136 value = integral_constant_value (value);
11138 if (TREE_CODE (value) == INTEGER_CST)
11140 value = perform_integral_promotions (value);
11141 constant_expression_warning (value);
11145 error ("enumerator value for %qD is not an integer constant", name);
11150 /* Default based on previous value. */
11151 if (value == NULL_TREE)
11153 if (TYPE_VALUES (enumtype))
11156 unsigned HOST_WIDE_INT lo;
11160 /* The next value is the previous value plus one.
11161 add_double doesn't know the type of the target expression,
11162 so we must check with int_fits_type_p as well. */
11163 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11164 if (error_operand_p (prev_value))
11165 value = error_mark_node;
11168 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11169 TREE_INT_CST_HIGH (prev_value),
11171 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11173 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11177 error ("overflow in enumeration values at %qD", name);
11178 value = error_mark_node;
11183 value = integer_zero_node;
11186 /* Remove no-op casts from the value. */
11187 STRIP_TYPE_NOPS (value);
11189 /* If the underlying type of the enum is fixed, check whether
11190 the enumerator values fits in the underlying type. If it
11191 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11192 if (ENUM_UNDERLYING_TYPE (enumtype)
11194 && TREE_CODE (value) == INTEGER_CST
11195 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11197 error ("enumerator value %E is too large for underlying type %<%T%>",
11198 value, ENUM_UNDERLYING_TYPE (enumtype));
11200 /* Silently convert the value so that we can continue. */
11201 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11206 /* C++ associates enums with global, function, or class declarations. */
11207 context = current_scope ();
11209 /* Build the actual enumeration constant. Note that the enumeration
11210 constants have the underlying type of the enum (if it is fixed)
11211 or the type of their initializer (if the underlying type of the
11212 enum is not fixed):
11216 If the underlying type is fixed, the type of each enumerator
11217 prior to the closing brace is the underlying type; if the
11218 initializing value of an enumerator cannot be represented by
11219 the underlying type, the program is ill-formed. If the
11220 underlying type is not fixed, the type of each enumerator is
11221 the type of its initializing value.
11223 If the underlying type is not fixed, it will be computed by
11224 finish_enum and we will reset the type of this enumerator. Of
11225 course, if we're processing a template, there may be no value. */
11226 type = value ? TREE_TYPE (value) : NULL_TREE;
11228 if (context && context == current_class_type)
11229 /* This enum declaration is local to the class. We need the full
11230 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11231 decl = build_lang_decl (CONST_DECL, name, type);
11233 /* It's a global enum, or it's local to a function. (Note local to
11234 a function could mean local to a class method. */
11235 decl = build_decl (CONST_DECL, name, type);
11237 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11238 TREE_CONSTANT (decl) = 1;
11239 TREE_READONLY (decl) = 1;
11240 DECL_INITIAL (decl) = value;
11242 if (context && context == current_class_type)
11243 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11244 on the TYPE_FIELDS list for `S'. (That's so that you can say
11245 things like `S::i' later.) */
11246 finish_member_declaration (decl);
11250 /* Add this enumeration constant to the list for this type. */
11251 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11254 /* Look for an enumerator with the given NAME within the enumeration
11255 type ENUMTYPE. This routine is used primarily for qualified name
11256 lookup into an enumerator in C++0x, e.g.,
11258 enum class Color { Red, Green, Blue };
11260 Color color = Color::Red;
11262 Returns the value corresponding to the enumerator, or
11263 NULL_TREE if no such enumerator was found. */
11265 lookup_enumerator (tree enumtype, tree name)
11268 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11270 e = purpose_member (name, TYPE_VALUES (enumtype));
11271 return e? TREE_VALUE (e) : NULL_TREE;
11275 /* We're defining DECL. Make sure that it's type is OK. */
11278 check_function_type (tree decl, tree current_function_parms)
11280 tree fntype = TREE_TYPE (decl);
11281 tree return_type = complete_type (TREE_TYPE (fntype));
11283 /* In a function definition, arg types must be complete. */
11284 require_complete_types_for_parms (current_function_parms);
11286 if (dependent_type_p (return_type))
11288 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11289 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11291 tree args = TYPE_ARG_TYPES (fntype);
11293 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11294 error ("return type %q#T is incomplete", return_type);
11296 error ("return type has Java class type %q#T", return_type);
11298 /* Make it return void instead. */
11299 if (TREE_CODE (fntype) == METHOD_TYPE)
11300 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11302 TREE_CHAIN (args));
11304 fntype = build_function_type (void_type_node, args);
11306 = build_exception_variant (fntype,
11307 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11310 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11313 /* Create the FUNCTION_DECL for a function definition.
11314 DECLSPECS and DECLARATOR are the parts of the declaration;
11315 they describe the function's name and the type it returns,
11316 but twisted together in a fashion that parallels the syntax of C.
11318 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11319 DECLARATOR is really the DECL for the function we are about to
11320 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11321 indicating that the function is an inline defined in-class.
11323 This function creates a binding context for the function body
11324 as well as setting up the FUNCTION_DECL in current_function_decl.
11326 For C++, we must first check whether that datum makes any sense.
11327 For example, "class A local_a(1,2);" means that variable local_a
11328 is an aggregate of type A, which should have a constructor
11329 applied to it with the argument list [1, 2].
11331 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11332 or may be a BLOCK if the function has been defined previously
11333 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11334 error_mark_node if the function has never been defined, or
11335 a BLOCK if the function has been defined somewhere. */
11338 start_preparsed_function (tree decl1, tree attrs, int flags)
11340 tree ctype = NULL_TREE;
11343 int doing_friend = 0;
11344 struct cp_binding_level *bl;
11345 tree current_function_parms;
11346 struct c_fileinfo *finfo
11347 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11348 bool honor_interface;
11350 /* Sanity check. */
11351 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11352 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11354 fntype = TREE_TYPE (decl1);
11355 if (TREE_CODE (fntype) == METHOD_TYPE)
11356 ctype = TYPE_METHOD_BASETYPE (fntype);
11358 /* ISO C++ 11.4/5. A friend function defined in a class is in
11359 the (lexical) scope of the class in which it is defined. */
11360 if (!ctype && DECL_FRIEND_P (decl1))
11362 ctype = DECL_FRIEND_CONTEXT (decl1);
11364 /* CTYPE could be null here if we're dealing with a template;
11365 for example, `inline friend float foo()' inside a template
11366 will have no CTYPE set. */
11367 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11373 if (DECL_DECLARED_INLINE_P (decl1)
11374 && lookup_attribute ("noinline", attrs))
11375 warning (0, "inline function %q+D given attribute noinline", decl1);
11377 /* Handle gnu_inline attribute. */
11378 if (GNU_INLINE_P (decl1))
11380 DECL_EXTERNAL (decl1) = 1;
11381 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11382 DECL_INTERFACE_KNOWN (decl1) = 1;
11383 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11386 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11387 /* This is a constructor, we must ensure that any default args
11388 introduced by this definition are propagated to the clones
11389 now. The clones are used directly in overload resolution. */
11390 adjust_clone_args (decl1);
11392 /* Sometimes we don't notice that a function is a static member, and
11393 build a METHOD_TYPE for it. Fix that up now. */
11394 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11395 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11397 revert_static_member_fn (decl1);
11401 /* Set up current_class_type, and enter the scope of the class, if
11404 push_nested_class (ctype);
11405 else if (DECL_STATIC_FUNCTION_P (decl1))
11406 push_nested_class (DECL_CONTEXT (decl1));
11408 /* Now that we have entered the scope of the class, we must restore
11409 the bindings for any template parameters surrounding DECL1, if it
11410 is an inline member template. (Order is important; consider the
11411 case where a template parameter has the same name as a field of
11412 the class.) It is not until after this point that
11413 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11414 if (flags & SF_INCLASS_INLINE)
11415 maybe_begin_member_template_processing (decl1);
11417 /* Effective C++ rule 15. */
11419 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11420 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11421 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11423 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11424 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11425 if (!DECL_INITIAL (decl1))
11426 DECL_INITIAL (decl1) = error_mark_node;
11428 /* This function exists in static storage.
11429 (This does not mean `static' in the C sense!) */
11430 TREE_STATIC (decl1) = 1;
11432 /* We must call push_template_decl after current_class_type is set
11433 up. (If we are processing inline definitions after exiting a
11434 class scope, current_class_type will be NULL_TREE until set above
11435 by push_nested_class.) */
11436 if (processing_template_decl)
11438 /* FIXME: Handle error_mark_node more gracefully. */
11439 tree newdecl1 = push_template_decl (decl1);
11440 if (newdecl1 != error_mark_node)
11444 /* We are now in the scope of the function being defined. */
11445 current_function_decl = decl1;
11447 /* Save the parm names or decls from this function's declarator
11448 where store_parm_decls will find them. */
11449 current_function_parms = DECL_ARGUMENTS (decl1);
11451 /* Make sure the parameter and return types are reasonable. When
11452 you declare a function, these types can be incomplete, but they
11453 must be complete when you define the function. */
11454 check_function_type (decl1, current_function_parms);
11456 /* Build the return declaration for the function. */
11457 restype = TREE_TYPE (fntype);
11458 if (DECL_RESULT (decl1) == NULL_TREE)
11462 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11463 DECL_ARTIFICIAL (resdecl) = 1;
11464 DECL_IGNORED_P (resdecl) = 1;
11465 DECL_RESULT (decl1) = resdecl;
11467 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11470 /* Let the user know we're compiling this function. */
11471 announce_function (decl1);
11473 /* Record the decl so that the function name is defined.
11474 If we already have a decl for this name, and it is a FUNCTION_DECL,
11475 use the old decl. */
11476 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11478 /* A specialization is not used to guide overload resolution. */
11479 if (!DECL_FUNCTION_MEMBER_P (decl1)
11480 && !(DECL_USE_TEMPLATE (decl1) &&
11481 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11483 tree olddecl = pushdecl (decl1);
11485 if (olddecl == error_mark_node)
11486 /* If something went wrong when registering the declaration,
11487 use DECL1; we have to have a FUNCTION_DECL to use when
11488 parsing the body of the function. */
11492 /* Otherwise, OLDDECL is either a previous declaration
11493 of the same function or DECL1 itself. */
11495 if (warn_missing_declarations
11496 && olddecl == decl1
11497 && !DECL_MAIN_P (decl1)
11498 && TREE_PUBLIC (decl1)
11499 && !DECL_DECLARED_INLINE_P (decl1))
11503 /* Check whether DECL1 is in an anonymous
11505 for (context = DECL_CONTEXT (decl1);
11507 context = DECL_CONTEXT (context))
11509 if (TREE_CODE (context) == NAMESPACE_DECL
11510 && DECL_NAME (context) == NULL_TREE)
11514 if (context == NULL)
11515 warning (OPT_Wmissing_declarations,
11516 "no previous declaration for %q+D", decl1);
11524 /* We need to set the DECL_CONTEXT. */
11525 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11526 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11528 fntype = TREE_TYPE (decl1);
11530 /* If #pragma weak applies, mark the decl appropriately now.
11531 The pragma only applies to global functions. Because
11532 determining whether or not the #pragma applies involves
11533 computing the mangled name for the declaration, we cannot
11534 apply the pragma until after we have merged this declaration
11535 with any previous declarations; if the original declaration
11536 has a linkage specification, that specification applies to
11537 the definition as well, and may affect the mangled name. */
11538 if (!DECL_CONTEXT (decl1))
11539 maybe_apply_pragma_weak (decl1);
11542 /* Reset this in case the call to pushdecl changed it. */
11543 current_function_decl = decl1;
11545 gcc_assert (DECL_INITIAL (decl1));
11547 /* This function may already have been parsed, in which case just
11548 return; our caller will skip over the body without parsing. */
11549 if (DECL_INITIAL (decl1) != error_mark_node)
11552 /* Initialize RTL machinery. We cannot do this until
11553 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11554 even when processing a template; this is how we get
11555 CFUN set up, and our per-function variables initialized.
11556 FIXME factor out the non-RTL stuff. */
11557 bl = current_binding_level;
11558 allocate_struct_function (decl1, processing_template_decl);
11560 /* Initialize the language data structures. Whenever we start
11561 a new function, we destroy temporaries in the usual way. */
11562 cfun->language = GGC_CNEW (struct language_function);
11563 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11564 current_binding_level = bl;
11566 /* Even though we're inside a function body, we still don't want to
11567 call expand_expr to calculate the size of a variable-sized array.
11568 We haven't necessarily assigned RTL to all variables yet, so it's
11569 not safe to try to expand expressions involving them. */
11570 cfun->dont_save_pending_sizes_p = 1;
11572 /* Start the statement-tree, start the tree now. */
11573 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11575 /* If we are (erroneously) defining a function that we have already
11576 defined before, wipe out what we knew before. */
11577 if (!DECL_PENDING_INLINE_P (decl1))
11578 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11580 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11582 /* We know that this was set up by `grokclassfn'. We do not
11583 wait until `store_parm_decls', since evil parse errors may
11584 never get us to that point. Here we keep the consistency
11585 between `current_class_type' and `current_class_ptr'. */
11586 tree t = DECL_ARGUMENTS (decl1);
11588 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11589 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11591 cp_function_chain->x_current_class_ref
11592 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11593 cp_function_chain->x_current_class_ptr = t;
11595 /* Constructors and destructors need to know whether they're "in
11596 charge" of initializing virtual base classes. */
11597 t = TREE_CHAIN (t);
11598 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11600 current_in_charge_parm = t;
11601 t = TREE_CHAIN (t);
11603 if (DECL_HAS_VTT_PARM_P (decl1))
11605 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11606 current_vtt_parm = t;
11610 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11611 /* Implicitly-defined methods (like the
11612 destructor for a class in which no destructor
11613 is explicitly declared) must not be defined
11614 until their definition is needed. So, we
11615 ignore interface specifications for
11616 compiler-generated functions. */
11617 && !DECL_ARTIFICIAL (decl1));
11619 if (DECL_INTERFACE_KNOWN (decl1))
11621 tree ctx = decl_function_context (decl1);
11623 if (DECL_NOT_REALLY_EXTERN (decl1))
11624 DECL_EXTERNAL (decl1) = 0;
11626 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11627 && TREE_PUBLIC (ctx))
11628 /* This is a function in a local class in an extern inline
11630 comdat_linkage (decl1);
11632 /* If this function belongs to an interface, it is public.
11633 If it belongs to someone else's interface, it is also external.
11634 This only affects inlines and template instantiations. */
11635 else if (!finfo->interface_unknown && honor_interface)
11637 if (DECL_DECLARED_INLINE_P (decl1)
11638 || DECL_TEMPLATE_INSTANTIATION (decl1)
11639 || processing_template_decl)
11641 DECL_EXTERNAL (decl1)
11642 = (finfo->interface_only
11643 || (DECL_DECLARED_INLINE_P (decl1)
11644 && ! flag_implement_inlines
11645 && !DECL_VINDEX (decl1)));
11647 /* For WIN32 we also want to put these in linkonce sections. */
11648 maybe_make_one_only (decl1);
11651 DECL_EXTERNAL (decl1) = 0;
11652 DECL_INTERFACE_KNOWN (decl1) = 1;
11653 /* If this function is in an interface implemented in this file,
11654 make sure that the back end knows to emit this function
11656 if (!DECL_EXTERNAL (decl1))
11657 mark_needed (decl1);
11659 else if (finfo->interface_unknown && finfo->interface_only
11660 && honor_interface)
11662 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11663 interface, we will have both finfo->interface_unknown and
11664 finfo->interface_only set. In that case, we don't want to
11665 use the normal heuristics because someone will supply a
11666 #pragma implementation elsewhere, and deducing it here would
11667 produce a conflict. */
11668 comdat_linkage (decl1);
11669 DECL_EXTERNAL (decl1) = 0;
11670 DECL_INTERFACE_KNOWN (decl1) = 1;
11671 DECL_DEFER_OUTPUT (decl1) = 1;
11675 /* This is a definition, not a reference.
11676 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11677 if (!GNU_INLINE_P (decl1))
11678 DECL_EXTERNAL (decl1) = 0;
11680 if ((DECL_DECLARED_INLINE_P (decl1)
11681 || DECL_TEMPLATE_INSTANTIATION (decl1))
11682 && ! DECL_INTERFACE_KNOWN (decl1)
11683 /* Don't try to defer nested functions for now. */
11684 && ! decl_function_context (decl1))
11685 DECL_DEFER_OUTPUT (decl1) = 1;
11687 DECL_INTERFACE_KNOWN (decl1) = 1;
11690 /* Determine the ELF visibility attribute for the function. We must not
11691 do this before calling "pushdecl", as we must allow "duplicate_decls"
11692 to merge any attributes appropriately. We also need to wait until
11694 if (!DECL_CLONED_FUNCTION_P (decl1))
11695 determine_visibility (decl1);
11697 begin_scope (sk_function_parms, decl1);
11701 if (DECL_DESTRUCTOR_P (decl1)
11702 || (DECL_CONSTRUCTOR_P (decl1)
11703 && targetm.cxx.cdtor_returns_this ()))
11705 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11706 DECL_CONTEXT (cdtor_label) = current_function_decl;
11709 start_fname_decls ();
11711 store_parm_decls (current_function_parms);
11715 /* Like start_preparsed_function, except that instead of a
11716 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11718 Returns 1 on success. If the DECLARATOR is not suitable for a function
11719 (it defines a datum instead), we return 0, which tells
11720 yyparse to report a parse error. */
11723 start_function (cp_decl_specifier_seq *declspecs,
11724 const cp_declarator *declarator,
11729 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11730 /* If the declarator is not suitable for a function definition,
11731 cause a syntax error. */
11732 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11735 if (DECL_MAIN_P (decl1))
11736 /* main must return int. grokfndecl should have corrected it
11737 (and issued a diagnostic) if the user got it wrong. */
11738 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11739 integer_type_node));
11741 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11746 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11750 use_eh_spec_block (tree fn)
11752 return (flag_exceptions && flag_enforce_eh_specs
11753 && !processing_template_decl
11754 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11755 /* We insert the EH_SPEC_BLOCK only in the original
11756 function; then, it is copied automatically to the
11758 && !DECL_CLONED_FUNCTION_P (fn)
11759 /* Implicitly-generated constructors and destructors have
11760 exception specifications. However, those specifications
11761 are the union of the possible exceptions specified by the
11762 constructors/destructors for bases and members, so no
11763 unallowed exception will ever reach this function. By
11764 not creating the EH_SPEC_BLOCK we save a little memory,
11765 and we avoid spurious warnings about unreachable
11767 && !DECL_ARTIFICIAL (fn));
11770 /* Store the parameter declarations into the current function declaration.
11771 This is called after parsing the parameter declarations, before
11772 digesting the body of the function.
11774 Also install to binding contour return value identifier, if any. */
11777 store_parm_decls (tree current_function_parms)
11779 tree fndecl = current_function_decl;
11782 /* This is a chain of any other decls that came in among the parm
11783 declarations. If a parm is declared with enum {foo, bar} x;
11784 then CONST_DECLs for foo and bar are put here. */
11785 tree nonparms = NULL_TREE;
11787 if (current_function_parms)
11789 /* This case is when the function was defined with an ANSI prototype.
11790 The parms already have decls, so we need not do anything here
11791 except record them as in effect
11792 and complain if any redundant old-style parm decls were written. */
11794 tree specparms = current_function_parms;
11797 /* Must clear this because it might contain TYPE_DECLs declared
11799 current_binding_level->names = NULL;
11801 /* If we're doing semantic analysis, then we'll call pushdecl
11802 for each of these. We must do them in reverse order so that
11803 they end in the correct forward order. */
11804 specparms = nreverse (specparms);
11806 for (parm = specparms; parm; parm = next)
11808 next = TREE_CHAIN (parm);
11809 if (TREE_CODE (parm) == PARM_DECL)
11811 if (DECL_NAME (parm) == NULL_TREE
11812 || TREE_CODE (parm) != VOID_TYPE)
11815 error ("parameter %qD declared void", parm);
11819 /* If we find an enum constant or a type tag,
11820 put it aside for the moment. */
11821 TREE_CHAIN (parm) = NULL_TREE;
11822 nonparms = chainon (nonparms, parm);
11826 /* Get the decls in their original chain order and record in the
11827 function. This is all and only the PARM_DECLs that were
11828 pushed into scope by the loop above. */
11829 DECL_ARGUMENTS (fndecl) = getdecls ();
11832 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11834 /* Now store the final chain of decls for the arguments
11835 as the decl-chain of the current lexical scope.
11836 Put the enumerators in as well, at the front so that
11837 DECL_ARGUMENTS is not modified. */
11838 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11840 if (use_eh_spec_block (current_function_decl))
11841 current_eh_spec_block = begin_eh_spec_block ();
11845 /* We have finished doing semantic analysis on DECL, but have not yet
11846 generated RTL for its body. Save away our current state, so that
11847 when we want to generate RTL later we know what to do. */
11850 save_function_data (tree decl)
11852 struct language_function *f;
11854 /* Save the language-specific per-function data so that we can
11855 get it back when we really expand this function. */
11856 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11859 f = GGC_NEW (struct language_function);
11860 memcpy (f, cp_function_chain, sizeof (struct language_function));
11861 DECL_SAVED_FUNCTION_DATA (decl) = f;
11863 /* Clear out the bits we don't need. */
11864 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11865 f->bindings = NULL;
11866 f->x_local_names = NULL;
11870 /* Set the return value of the constructor (if present). */
11873 finish_constructor_body (void)
11878 if (targetm.cxx.cdtor_returns_this ()
11879 && (! TYPE_FOR_JAVA (current_class_type)))
11881 /* Any return from a constructor will end up here. */
11882 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11884 val = DECL_ARGUMENTS (current_function_decl);
11885 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11886 DECL_RESULT (current_function_decl), val);
11887 /* Return the address of the object. */
11888 exprstmt = build_stmt (RETURN_EXPR, val);
11889 add_stmt (exprstmt);
11893 /* Do all the processing for the beginning of a destructor; set up the
11894 vtable pointers and cleanups for bases and members. */
11897 begin_destructor_body (void)
11899 tree compound_stmt;
11901 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11902 issued an error message. We still want to try to process the
11903 body of the function, but initialize_vtbl_ptrs will crash if
11904 TYPE_BINFO is NULL. */
11905 if (COMPLETE_TYPE_P (current_class_type))
11907 compound_stmt = begin_compound_stmt (0);
11908 /* Make all virtual function table pointers in non-virtual base
11909 classes point to CURRENT_CLASS_TYPE's virtual function
11911 initialize_vtbl_ptrs (current_class_ptr);
11912 finish_compound_stmt (compound_stmt);
11914 /* And insert cleanups for our bases and members so that they
11915 will be properly destroyed if we throw. */
11916 push_base_cleanups ();
11920 /* At the end of every destructor we generate code to delete the object if
11921 necessary. Do that now. */
11924 finish_destructor_body (void)
11928 /* Any return from a destructor will end up here; that way all base
11929 and member cleanups will be run when the function returns. */
11930 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11932 /* In a virtual destructor, we must call delete. */
11933 if (DECL_VIRTUAL_P (current_function_decl))
11936 tree virtual_size = cxx_sizeof (current_class_type);
11940 At the point of definition of a virtual destructor (including
11941 an implicit definition), non-placement operator delete shall
11942 be looked up in the scope of the destructor's class and if
11943 found shall be accessible and unambiguous. */
11944 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11946 /*global_p=*/false,
11947 /*placement=*/NULL_TREE,
11948 /*alloc_fn=*/NULL_TREE);
11950 if_stmt = begin_if_stmt ();
11951 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11952 current_in_charge_parm,
11955 finish_expr_stmt (exprstmt);
11956 finish_then_clause (if_stmt);
11957 finish_if_stmt (if_stmt);
11960 if (targetm.cxx.cdtor_returns_this ())
11964 val = DECL_ARGUMENTS (current_function_decl);
11965 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11966 DECL_RESULT (current_function_decl), val);
11967 /* Return the address of the object. */
11968 exprstmt = build_stmt (RETURN_EXPR, val);
11969 add_stmt (exprstmt);
11973 /* Do the necessary processing for the beginning of a function body, which
11974 in this case includes member-initializers, but not the catch clauses of
11975 a function-try-block. Currently, this means opening a binding level
11976 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11979 begin_function_body (void)
11983 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11986 if (processing_template_decl)
11987 /* Do nothing now. */;
11989 /* Always keep the BLOCK node associated with the outermost pair of
11990 curly braces of a function. These are needed for correct
11991 operation of dwarfout.c. */
11992 keep_next_level (true);
11994 stmt = begin_compound_stmt (BCS_FN_BODY);
11996 if (processing_template_decl)
11997 /* Do nothing now. */;
11998 else if (DECL_DESTRUCTOR_P (current_function_decl))
11999 begin_destructor_body ();
12004 /* Do the processing for the end of a function body. Currently, this means
12005 closing out the cleanups for fully-constructed bases and members, and in
12006 the case of the destructor, deleting the object if desired. Again, this
12007 is only meaningful for [cd]tors, since they are the only functions where
12008 there is a significant distinction between the main body and any
12009 function catch clauses. Handling, say, main() return semantics here
12010 would be wrong, as flowing off the end of a function catch clause for
12011 main() would also need to return 0. */
12014 finish_function_body (tree compstmt)
12016 if (compstmt == NULL_TREE)
12019 /* Close the block. */
12020 finish_compound_stmt (compstmt);
12022 if (processing_template_decl)
12023 /* Do nothing now. */;
12024 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12025 finish_constructor_body ();
12026 else if (DECL_DESTRUCTOR_P (current_function_decl))
12027 finish_destructor_body ();
12030 /* Given a function, returns the BLOCK corresponding to the outermost level
12031 of curly braces, skipping the artificial block created for constructor
12035 outer_curly_brace_block (tree fndecl)
12037 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12038 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12039 /* Skip the artificial function body block. */
12040 block = BLOCK_SUBBLOCKS (block);
12044 /* Finish up a function declaration and compile that function
12045 all the way to assembler language output. The free the storage
12046 for the function definition.
12048 FLAGS is a bitwise or of the following values:
12050 We just finished processing the body of an in-class inline
12051 function definition. (This processing will have taken place
12052 after the class definition is complete.) */
12055 finish_function (int flags)
12057 tree fndecl = current_function_decl;
12058 tree fntype, ctype = NULL_TREE;
12059 int inclass_inline = (flags & 2) != 0;
12062 /* When we get some parse errors, we can end up without a
12063 current_function_decl, so cope. */
12064 if (fndecl == NULL_TREE)
12065 return error_mark_node;
12067 gcc_assert (!defer_mark_used_calls);
12068 defer_mark_used_calls = true;
12070 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12071 && DECL_VIRTUAL_P (fndecl)
12072 && !processing_template_decl)
12074 tree fnclass = DECL_CONTEXT (fndecl);
12075 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12076 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12079 nested = function_depth > 1;
12080 fntype = TREE_TYPE (fndecl);
12082 /* TREE_READONLY (fndecl) = 1;
12083 This caused &foo to be of type ptr-to-const-function
12084 which then got a warning when stored in a ptr-to-function variable. */
12086 gcc_assert (building_stmt_tree ());
12087 /* The current function is being defined, so its DECL_INITIAL should
12088 be set, and unless there's a multiple definition, it should be
12089 error_mark_node. */
12090 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12092 /* For a cloned function, we've already got all the code we need;
12093 there's no need to add any extra bits. */
12094 if (!DECL_CLONED_FUNCTION_P (fndecl))
12096 if (DECL_MAIN_P (current_function_decl))
12100 /* Make it so that `main' always returns 0 by default (or
12103 stmt = finish_return_stmt (integer_one_node);
12105 stmt = finish_return_stmt (integer_zero_node);
12107 /* Hack. We don't want the middle-end to warn that this
12108 return is unreachable, so put the statement on the
12111 location_t linezero = linemap_line_start (line_table, 0, 1);
12112 SET_EXPR_LOCATION (stmt, linezero);
12116 if (use_eh_spec_block (current_function_decl))
12117 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12118 (TREE_TYPE (current_function_decl)),
12119 current_eh_spec_block);
12122 /* If we're saving up tree structure, tie off the function now. */
12123 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12125 finish_fname_decls ();
12127 /* If this function can't throw any exceptions, remember that. */
12128 if (!processing_template_decl
12129 && !cp_function_chain->can_throw
12130 && !flag_non_call_exceptions
12131 && !DECL_REPLACEABLE_P (fndecl))
12132 TREE_NOTHROW (fndecl) = 1;
12134 /* This must come after expand_function_end because cleanups might
12135 have declarations (from inline functions) that need to go into
12136 this function's blocks. */
12138 /* If the current binding level isn't the outermost binding level
12139 for this function, either there is a bug, or we have experienced
12140 syntax errors and the statement tree is malformed. */
12141 if (current_binding_level->kind != sk_function_parms)
12143 /* Make sure we have already experienced errors. */
12144 gcc_assert (errorcount);
12146 /* Throw away the broken statement tree and extra binding
12148 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12150 while (current_binding_level->kind != sk_function_parms)
12152 if (current_binding_level->kind == sk_class)
12153 pop_nested_class ();
12155 poplevel (0, 0, 0);
12158 poplevel (1, 0, 1);
12160 /* Statements should always be full-expressions at the outermost set
12161 of curly braces for a function. */
12162 gcc_assert (stmts_are_full_exprs_p ());
12164 /* Set up the named return value optimization, if we can. Candidate
12165 variables are selected in check_return_expr. */
12166 if (current_function_return_value)
12168 tree r = current_function_return_value;
12171 if (r != error_mark_node
12172 /* This is only worth doing for fns that return in memory--and
12173 simpler, since we don't have to worry about promoted modes. */
12174 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12175 /* Only allow this for variables declared in the outer scope of
12176 the function so we know that their lifetime always ends with a
12177 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12178 we were to do this optimization in tree-ssa. */
12179 && (outer = outer_curly_brace_block (fndecl))
12180 && chain_member (r, BLOCK_VARS (outer)))
12181 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12183 current_function_return_value = NULL_TREE;
12186 /* Remember that we were in class scope. */
12187 if (current_class_name)
12188 ctype = current_class_type;
12190 /* Must mark the RESULT_DECL as being in this function. */
12191 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12193 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12194 to the FUNCTION_DECL node itself. */
12195 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12197 /* Save away current state, if appropriate. */
12198 if (!processing_template_decl)
12199 save_function_data (fndecl);
12201 /* Complain if there's just no return statement. */
12202 if (warn_return_type
12203 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12204 && !dependent_type_p (TREE_TYPE (fntype))
12205 && !current_function_returns_value && !current_function_returns_null
12206 /* Don't complain if we abort or throw. */
12207 && !current_function_returns_abnormally
12208 && !DECL_NAME (DECL_RESULT (fndecl))
12209 && !TREE_NO_WARNING (fndecl)
12210 /* Structor return values (if any) are set by the compiler. */
12211 && !DECL_CONSTRUCTOR_P (fndecl)
12212 && !DECL_DESTRUCTOR_P (fndecl))
12214 warning (OPT_Wreturn_type,
12215 "no return statement in function returning non-void");
12216 TREE_NO_WARNING (fndecl) = 1;
12219 /* Store the end of the function, so that we get good line number
12220 info for the epilogue. */
12221 cfun->function_end_locus = input_location;
12223 /* Genericize before inlining. */
12224 if (!processing_template_decl)
12226 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12227 cp_genericize (fndecl);
12228 /* Clear out the bits we don't need. */
12229 f->x_current_class_ptr = NULL;
12230 f->x_current_class_ref = NULL;
12231 f->x_eh_spec_block = NULL;
12232 f->x_in_charge_parm = NULL;
12233 f->x_vtt_parm = NULL;
12234 f->x_return_value = NULL;
12235 f->bindings = NULL;
12236 f->extern_decl_map = NULL;
12238 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12239 c_warn_unused_result (gimple_body (fndecl));
12241 /* Clear out the bits we don't need. */
12242 local_names = NULL;
12244 /* We're leaving the context of this function, so zap cfun. It's still in
12245 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12247 current_function_decl = NULL;
12249 /* If this is an in-class inline definition, we may have to pop the
12250 bindings for the template parameters that we added in
12251 maybe_begin_member_template_processing when start_function was
12253 if (inclass_inline)
12254 maybe_end_member_template_processing ();
12256 /* Leave the scope of the class. */
12258 pop_nested_class ();
12264 /* Let the error reporting routines know that we're outside a
12265 function. For a nested function, this value is used in
12266 cxx_pop_function_context and then reset via pop_function_context. */
12267 current_function_decl = NULL_TREE;
12269 defer_mark_used_calls = false;
12270 if (deferred_mark_used_calls)
12275 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12277 VEC_free (tree, gc, deferred_mark_used_calls);
12283 /* Create the FUNCTION_DECL for a function definition.
12284 DECLSPECS and DECLARATOR are the parts of the declaration;
12285 they describe the return type and the name of the function,
12286 but twisted together in a fashion that parallels the syntax of C.
12288 This function creates a binding context for the function body
12289 as well as setting up the FUNCTION_DECL in current_function_decl.
12291 Returns a FUNCTION_DECL on success.
12293 If the DECLARATOR is not suitable for a function (it defines a datum
12294 instead), we return 0, which tells yyparse to report a parse error.
12296 May return void_type_node indicating that this method is actually
12297 a friend. See grokfield for more details.
12299 Came here with a `.pushlevel' .
12301 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12302 CHANGES TO CODE IN `grokfield'. */
12305 start_method (cp_decl_specifier_seq *declspecs,
12306 const cp_declarator *declarator, tree attrlist)
12308 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12311 if (fndecl == error_mark_node)
12312 return error_mark_node;
12314 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12316 error ("invalid member function declaration");
12317 return error_mark_node;
12321 cplus_decl_attributes (&fndecl, attrlist, 0);
12323 /* Pass friends other than inline friend functions back. */
12324 if (fndecl == void_type_node)
12327 if (DECL_IN_AGGR_P (fndecl))
12329 if (DECL_CONTEXT (fndecl)
12330 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12331 error ("%qD is already defined in class %qT", fndecl,
12332 DECL_CONTEXT (fndecl));
12333 return error_mark_node;
12336 check_template_shadow (fndecl);
12338 DECL_DECLARED_INLINE_P (fndecl) = 1;
12339 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12341 /* We process method specializations in finish_struct_1. */
12342 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12344 fndecl = push_template_decl (fndecl);
12345 if (fndecl == error_mark_node)
12349 if (! DECL_FRIEND_P (fndecl))
12351 if (TREE_CHAIN (fndecl))
12353 fndecl = copy_node (fndecl);
12354 TREE_CHAIN (fndecl) = NULL_TREE;
12358 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12360 /* Make a place for the parms. */
12361 begin_scope (sk_function_parms, fndecl);
12363 DECL_IN_AGGR_P (fndecl) = 1;
12367 /* Go through the motions of finishing a function definition.
12368 We don't compile this method until after the whole class has
12371 FINISH_METHOD must return something that looks as though it
12372 came from GROKFIELD (since we are defining a method, after all).
12374 This is called after parsing the body of the function definition.
12375 STMTS is the chain of statements that makes up the function body.
12377 DECL is the ..._DECL that `start_method' provided. */
12380 finish_method (tree decl)
12382 tree fndecl = decl;
12387 if (decl == void_type_node)
12390 old_initial = DECL_INITIAL (fndecl);
12392 /* Undo the level for the parms (from start_method).
12393 This is like poplevel, but it causes nothing to be
12394 saved. Saving information here confuses symbol-table
12395 output routines. Besides, this information will
12396 be correctly output when this method is actually
12399 /* Clear out the meanings of the local variables of this level;
12400 also record in each decl which block it belongs to. */
12402 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12404 if (DECL_NAME (link) != NULL_TREE)
12405 pop_binding (DECL_NAME (link), link);
12406 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12407 DECL_CONTEXT (link) = NULL_TREE;
12410 poplevel (0, 0, 0);
12412 DECL_INITIAL (fndecl) = old_initial;
12414 /* We used to check if the context of FNDECL was different from
12415 current_class_type as another way to get inside here. This didn't work
12416 for String.cc in libg++. */
12417 if (DECL_FRIEND_P (fndecl))
12419 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12421 decl = void_type_node;
12428 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12429 we can lay it out later, when and if its type becomes complete. */
12432 maybe_register_incomplete_var (tree var)
12434 gcc_assert (TREE_CODE (var) == VAR_DECL);
12436 /* Keep track of variables with incomplete types. */
12437 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12438 && DECL_EXTERNAL (var))
12440 tree inner_type = TREE_TYPE (var);
12442 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12443 inner_type = TREE_TYPE (inner_type);
12444 inner_type = TYPE_MAIN_VARIANT (inner_type);
12446 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12447 /* RTTI TD entries are created while defining the type_info. */
12448 || (TYPE_LANG_SPECIFIC (inner_type)
12449 && TYPE_BEING_DEFINED (inner_type)))
12450 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12454 /* Called when a class type (given by TYPE) is defined. If there are
12455 any existing VAR_DECLs whose type has been completed by this
12456 declaration, update them now. */
12459 complete_vars (tree type)
12461 tree *list = &incomplete_vars;
12463 gcc_assert (CLASS_TYPE_P (type));
12466 if (same_type_p (type, TREE_PURPOSE (*list)))
12468 tree var = TREE_VALUE (*list);
12469 tree type = TREE_TYPE (var);
12470 /* Complete the type of the variable. The VAR_DECL itself
12471 will be laid out in expand_expr. */
12472 complete_type (type);
12473 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12474 /* Remove this entry from the list. */
12475 *list = TREE_CHAIN (*list);
12478 list = &TREE_CHAIN (*list);
12481 /* Check for pending declarations which may have abstract type. */
12482 complete_type_check_abstract (type);
12485 /* If DECL is of a type which needs a cleanup, build and return an
12486 expression to perform that cleanup here. Return NULL_TREE if no
12487 cleanup need be done. */
12490 cxx_maybe_build_cleanup (tree decl)
12496 /* Assume no cleanup is required. */
12497 cleanup = NULL_TREE;
12499 if (error_operand_p (decl))
12502 /* Handle "__attribute__((cleanup))". We run the cleanup function
12503 before the destructor since the destructor is what actually
12504 terminates the lifetime of the object. */
12505 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12512 /* Get the name specified by the user for the cleanup function. */
12513 id = TREE_VALUE (TREE_VALUE (attr));
12514 /* Look up the name to find the cleanup function to call. It is
12515 important to use lookup_name here because that is what is
12516 used in c-common.c:handle_cleanup_attribute when performing
12517 initial checks on the attribute. Note that those checks
12518 include ensuring that the function found is not an overloaded
12519 function, or an object with an overloaded call operator,
12520 etc.; we can rely on the fact that the function found is an
12521 ordinary FUNCTION_DECL. */
12522 fn = lookup_name (id);
12523 arg = build_address (decl);
12525 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12527 tf_warning_or_error);
12529 /* Handle ordinary C++ destructors. */
12530 type = TREE_TYPE (decl);
12531 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12533 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12534 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12535 && CLASSTYPE_VBASECLASSES (type));
12539 if (TREE_CODE (type) == ARRAY_TYPE)
12542 addr = build_address (decl);
12544 /* Optimize for space over speed here. */
12545 if (!has_vbases || flag_expensive_optimizations)
12546 flags |= LOOKUP_NONVIRTUAL;
12548 call = build_delete (TREE_TYPE (addr), addr,
12549 sfk_complete_destructor, flags, 0);
12551 cleanup = build_compound_expr (cleanup, call);
12559 /* When a stmt has been parsed, this function is called. */
12566 /* DECL was originally constructed as a non-static member function,
12567 but turned out to be static. Update it accordingly. */
12570 revert_static_member_fn (tree decl)
12573 tree function = TREE_TYPE (decl);
12574 tree args = TYPE_ARG_TYPES (function);
12576 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12577 != TYPE_UNQUALIFIED)
12578 error ("static member function %q#D declared with type qualifiers", decl);
12580 args = TREE_CHAIN (args);
12581 tmp = build_function_type (TREE_TYPE (function), args);
12582 tmp = build_qualified_type (tmp, cp_type_quals (function));
12583 tmp = build_exception_variant (tmp,
12584 TYPE_RAISES_EXCEPTIONS (function));
12585 TREE_TYPE (decl) = tmp;
12586 if (DECL_ARGUMENTS (decl))
12587 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12588 DECL_STATIC_FUNCTION_P (decl) = 1;
12591 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12592 one of the language-independent trees. */
12594 enum cp_tree_node_structure_enum
12595 cp_tree_node_structure (union lang_tree_node * t)
12597 switch (TREE_CODE (&t->generic))
12599 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12600 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12601 case OVERLOAD: return TS_CP_OVERLOAD;
12602 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12603 case PTRMEM_CST: return TS_CP_PTRMEM;
12604 case BASELINK: return TS_CP_BASELINK;
12605 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12606 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12607 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12608 default: return TS_CP_GENERIC;
12612 /* Build the void_list_node (void_type_node having been created). */
12614 build_void_list_node (void)
12616 tree t = build_tree_list (NULL_TREE, void_type_node);
12621 cp_missing_noreturn_ok_p (tree decl)
12623 /* A missing noreturn is ok for the `main' function. */
12624 return DECL_MAIN_P (decl);
12627 /* Return the COMDAT group into which DECL should be placed. */
12630 cxx_comdat_group (tree decl)
12634 /* Virtual tables, construction virtual tables, and virtual table
12635 tables all go in a single COMDAT group, named after the primary
12637 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12638 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12639 /* For all other DECLs, the COMDAT group is the mangled name of the
12640 declaration itself. */
12643 while (DECL_THUNK_P (decl))
12645 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12646 into the same section as the target function. In that case
12647 we must return target's name. */
12648 tree target = THUNK_TARGET (decl);
12649 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12650 && DECL_SECTION_NAME (target) != NULL
12651 && DECL_ONE_ONLY (target))
12656 name = DECL_ASSEMBLER_NAME (decl);
12659 return IDENTIFIER_POINTER (name);
12662 #include "gt-cp-decl.h"