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 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
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"
53 #include "tree-flow.h"
55 static tree grokparms (cp_parameter_declarator *, tree *);
56 static const char *redeclaration_error_message (tree, tree);
58 static int decl_jump_unsafe (tree);
59 static void require_complete_types_for_parms (tree);
60 static int ambi_op_p (enum tree_code);
61 static int unary_op_p (enum tree_code);
62 static void push_local_name (tree);
63 static tree grok_reference_init (tree, tree, tree, tree *);
64 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
66 static void record_unknown_type (tree, const char *);
67 static tree builtin_function_1 (const char *, tree, tree,
68 enum built_in_function code,
69 enum built_in_class cl, const char *,
71 static tree build_library_fn_1 (tree, enum tree_code, tree);
72 static int member_function_or_else (tree, tree, enum overload_flags);
73 static void bad_specifiers (tree, const char *, int, int, int, int,
75 static void check_for_uninitialized_const_var (tree);
76 static hashval_t typename_hash (const void *);
77 static int typename_compare (const void *, const void *);
78 static tree local_variable_p_walkfn (tree *, int *, void *);
79 static tree record_builtin_java_type (const char *, int);
80 static const char *tag_name (enum tag_types);
81 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
82 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
83 static tree make_label_decl (tree, int);
84 static void use_label (tree);
85 static void check_previous_goto_1 (tree, struct cp_binding_level *, tree,
87 static void check_previous_goto (struct named_label_use_list *);
88 static void check_switch_goto (struct cp_binding_level *);
89 static void check_previous_gotos (tree);
90 static void pop_label (tree, tree);
91 static void pop_labels (tree);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static void maybe_commonize_var (tree);
95 static tree check_initializer (tree, tree, int, tree *);
96 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
97 static void save_function_data (tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
116 static tree next_initializable_field (tree);
117 static tree reshape_init (tree, tree *);
119 /* Erroneous argument lists can use this *IFF* they do not modify it. */
120 tree error_mark_list;
122 /* The following symbols are subsumed in the cp_global_trees array, and
123 listed here individually for documentation purposes.
126 tree wchar_decl_node;
128 tree vtable_entry_type;
129 tree delta_type_node;
130 tree __t_desc_type_node;
131 tree ti_desc_type_node;
132 tree bltn_desc_type_node, ptr_desc_type_node;
133 tree ary_desc_type_node, func_desc_type_node, enum_desc_type_node;
134 tree class_desc_type_node, si_class_desc_type_node, vmi_class_desc_type_node;
135 tree ptm_desc_type_node;
136 tree base_desc_type_node;
138 tree class_type_node;
139 tree unknown_type_node;
141 Array type `vtable_entry_type[]'
144 tree vtbl_ptr_type_node;
151 A FUNCTION_DECL which can call `abort'. Not necessarily the
152 one that the user will declare, but sufficient to be called
153 by routines that want to abort the program.
157 The FUNCTION_DECL for the default `::operator delete'.
159 tree global_delete_fndecl;
162 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
167 tree cp_global_trees[CPTI_MAX];
169 /* Indicates that there is a type value in some namespace, although
170 that is not necessarily in scope at the moment. */
172 tree global_type_node;
174 /* The node that holds the "name" of the global scope. */
175 tree global_scope_name;
177 /* Used only for jumps to as-yet undefined labels, since jumps to
178 defined labels can have their validity checked immediately. */
180 struct named_label_use_list GTY(())
182 struct cp_binding_level *binding_level;
185 location_t o_goto_locus;
186 struct named_label_use_list *next;
189 #define named_label_uses cp_function_chain->x_named_label_uses
191 #define local_names cp_function_chain->x_local_names
193 /* A list of objects which have constructors or destructors
194 which reside in the global scope. The decl is stored in
195 the TREE_VALUE slot and the initializer is stored
196 in the TREE_PURPOSE slot. */
197 tree static_aggregates;
201 /* A node for the integer constants 2, and 3. */
203 tree integer_two_node, integer_three_node;
205 /* A list of all LABEL_DECLs in the function that have names. Here so
206 we can clear out their names' definitions at the end of the
207 function, and so we can check the validity of jumps to these labels. */
209 struct named_label_list GTY(())
211 struct cp_binding_level *binding_level;
216 struct named_label_list *next;
217 unsigned int in_try_scope : 1;
218 unsigned int in_catch_scope : 1;
221 #define named_labels cp_function_chain->x_named_labels
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
228 /* States indicating how grokdeclarator() should handle declspecs marked
229 with __attribute__((deprecated)). An object declared as
230 __attribute__((deprecated)) suppresses warnings of uses of other
233 enum deprecated_states {
238 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
240 /* True if a declaration with an `extern' linkage specifier is being
242 bool have_extern_spec;
245 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
246 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
247 time the VAR_DECL was declared, the type was incomplete. */
249 static GTY(()) tree incomplete_vars;
251 /* Returns the kind of template specialization we are currently
252 processing, given that it's declaration contained N_CLASS_SCOPES
253 explicit scope qualifications. */
256 current_tmpl_spec_kind (int n_class_scopes)
258 int n_template_parm_scopes = 0;
259 int seen_specialization_p = 0;
260 int innermost_specialization_p = 0;
261 struct cp_binding_level *b;
263 /* Scan through the template parameter scopes. */
264 for (b = current_binding_level;
265 b->kind == sk_template_parms;
268 /* If we see a specialization scope inside a parameter scope,
269 then something is wrong. That corresponds to a declaration
272 template <class T> template <> ...
274 which is always invalid since [temp.expl.spec] forbids the
275 specialization of a class member template if the enclosing
276 class templates are not explicitly specialized as well. */
277 if (b->explicit_spec_p)
279 if (n_template_parm_scopes == 0)
280 innermost_specialization_p = 1;
282 seen_specialization_p = 1;
284 else if (seen_specialization_p == 1)
285 return tsk_invalid_member_spec;
287 ++n_template_parm_scopes;
290 /* Handle explicit instantiations. */
291 if (processing_explicit_instantiation)
293 if (n_template_parm_scopes != 0)
294 /* We've seen a template parameter list during an explicit
295 instantiation. For example:
297 template <class T> template void f(int);
299 This is erroneous. */
300 return tsk_invalid_expl_inst;
302 return tsk_expl_inst;
305 if (n_template_parm_scopes < n_class_scopes)
306 /* We've not seen enough template headers to match all the
307 specialized classes present. For example:
309 template <class T> void R<T>::S<T>::f(int);
311 This is invalid; there needs to be one set of template
312 parameters for each class. */
313 return tsk_insufficient_parms;
314 else if (n_template_parm_scopes == n_class_scopes)
315 /* We're processing a non-template declaration (even though it may
316 be a member of a template class.) For example:
318 template <class T> void S<T>::f(int);
320 The `class T' maches the `S<T>', leaving no template headers
321 corresponding to the `f'. */
323 else if (n_template_parm_scopes > n_class_scopes + 1)
324 /* We've got too many template headers. For example:
326 template <> template <class T> void f (T);
328 There need to be more enclosing classes. */
329 return tsk_excessive_parms;
331 /* This must be a template. It's of the form:
333 template <class T> template <class U> void S<T>::f(U);
335 This is a specialization if the innermost level was a
336 specialization; otherwise it's just a definition of the
338 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
341 /* Exit the current scope. */
349 /* When a label goes out of scope, check to see if that label was used
350 in a valid manner, and issue any appropriate warnings or errors. */
353 pop_label (tree label, tree old_value)
355 if (!processing_template_decl)
357 if (DECL_INITIAL (label) == NULL_TREE)
361 cp_error_at ("label %qD used but not defined", label);
362 #ifdef USE_MAPPED_LOCATION
363 location = input_location; /* FIXME want (input_filename, (line)0) */
365 location.file = input_filename;
368 /* Avoid crashing later. */
369 define_label (location, DECL_NAME (label));
371 else if (warn_unused_label && !TREE_USED (label))
372 cp_warning_at ("label %qD defined but not used", label);
375 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
378 /* At the end of a function, all labels declared within the function
379 go out of scope. BLOCK is the top-level block for the
383 pop_labels (tree block)
385 struct named_label_list *link;
387 /* Clear out the definitions of all label names, since their scopes
389 for (link = named_labels; link; link = link->next)
391 pop_label (link->label_decl, link->old_value);
392 /* Put the labels into the "variables" of the top-level block,
393 so debugger can see them. */
394 TREE_CHAIN (link->label_decl) = BLOCK_VARS (block);
395 BLOCK_VARS (block) = link->label_decl;
401 /* The following two routines are used to interface to Objective-C++.
402 The binding level is purposely treated as an opaque type. */
405 objc_get_current_scope (void)
407 return current_binding_level;
410 /* The following routine is used by the NeXT-style SJLJ exceptions;
411 variables get marked 'volatile' so as to not be clobbered by
412 _setjmp()/_longjmp() calls. All variables in the current scope,
413 as well as parent scopes up to (but not including) ENCLOSING_BLK
414 shall be thusly marked. */
417 objc_mark_locals_volatile (void *enclosing_blk)
419 struct cp_binding_level *scope;
421 for (scope = current_binding_level;
422 scope && scope != enclosing_blk;
423 scope = scope->level_chain)
427 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
428 objc_volatilize_decl (decl);
430 /* Do not climb up past the current function. */
431 if (scope->kind == sk_function_parms)
436 /* Exit a binding level.
437 Pop the level off, and restore the state of the identifier-decl mappings
438 that were in effect when this level was entered.
440 If KEEP == 1, this level had explicit declarations, so
441 and create a "block" (a BLOCK node) for the level
442 to record its declarations and subblocks for symbol table output.
444 If FUNCTIONBODY is nonzero, this level is the body of a function,
445 so create a block as if KEEP were set and also clear out all
448 If REVERSE is nonzero, reverse the order of decls before putting
449 them into the BLOCK. */
452 poplevel (int keep, int reverse, int functionbody)
455 /* The chain of decls was accumulated in reverse order.
456 Put it into forward order, just for cleanliness. */
458 int tmp = functionbody;
459 int real_functionbody;
463 int leaving_for_scope;
466 timevar_push (TV_NAME_LOOKUP);
471 gcc_assert (current_binding_level->kind != sk_class);
473 real_functionbody = (current_binding_level->kind == sk_cleanup
474 ? ((functionbody = 0), tmp) : functionbody);
475 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
477 gcc_assert (!VEC_length(cp_class_binding,
478 current_binding_level->class_shadowed));
480 /* We used to use KEEP == 2 to indicate that the new block should go
481 at the beginning of the list of blocks at this binding level,
482 rather than the end. This hack is no longer used. */
483 gcc_assert (keep == 0 || keep == 1);
485 if (current_binding_level->keep)
488 /* Any uses of undefined labels, and any defined labels, now operate
489 under constraints of next binding contour. */
490 if (cfun && !functionbody)
492 struct cp_binding_level *level_chain;
493 level_chain = current_binding_level->level_chain;
496 struct named_label_use_list *uses;
497 struct named_label_list *labels;
498 for (labels = named_labels; labels; labels = labels->next)
499 if (labels->binding_level == current_binding_level)
502 if (current_binding_level->kind == sk_try)
503 labels->in_try_scope = 1;
504 if (current_binding_level->kind == sk_catch)
505 labels->in_catch_scope = 1;
506 for (decl = labels->names_in_scope; decl;
507 decl = TREE_CHAIN (decl))
508 if (decl_jump_unsafe (decl))
509 labels->bad_decls = tree_cons (NULL_TREE, decl,
511 labels->binding_level = level_chain;
512 labels->names_in_scope = level_chain->names;
515 for (uses = named_label_uses; uses; uses = uses->next)
516 if (uses->binding_level == current_binding_level)
518 uses->binding_level = level_chain;
519 uses->names_in_scope = level_chain->names;
524 /* Get the decls in the order they were written.
525 Usually current_binding_level->names is in reverse order.
526 But parameter decls were previously put in forward order. */
529 current_binding_level->names
530 = decls = nreverse (current_binding_level->names);
532 decls = current_binding_level->names;
534 /* If there were any declarations or structure tags in that level,
535 or if this level is a function body,
536 create a BLOCK to record them for the life of this function. */
538 if (keep == 1 || functionbody)
539 block = make_node (BLOCK);
540 if (block != NULL_TREE)
542 BLOCK_VARS (block) = decls;
543 BLOCK_SUBBLOCKS (block) = subblocks;
546 /* In each subblock, record that this is its superior. */
548 for (link = subblocks; link; link = TREE_CHAIN (link))
549 BLOCK_SUPERCONTEXT (link) = block;
551 /* We still support the old for-scope rules, whereby the variables
552 in a for-init statement were in scope after the for-statement
553 ended. We only use the new rules if flag_new_for_scope is
556 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
558 /* Before we remove the declarations first check for unused variables. */
559 if (warn_unused_variable
560 && !processing_template_decl)
561 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
562 if (TREE_CODE (decl) == VAR_DECL
563 && ! TREE_USED (decl)
564 && ! DECL_IN_SYSTEM_HEADER (decl)
565 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
566 warning (0, "%Junused variable %qD", decl, decl);
568 /* Remove declarations for all the DECLs in this level. */
569 for (link = decls; link; link = TREE_CHAIN (link))
571 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
574 tree name = DECL_NAME (link);
578 ob = outer_binding (name,
579 IDENTIFIER_BINDING (name),
582 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
584 ns_binding = NULL_TREE;
586 if (ob && ob->scope == current_binding_level->level_chain)
587 /* We have something like:
592 and we are leaving the `for' scope. There's no reason to
593 keep the binding of the inner `i' in this case. */
594 pop_binding (name, link);
595 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
596 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
597 /* Here, we have something like:
605 We must pop the for-scope binding so we know what's a
606 type and what isn't. */
607 pop_binding (name, link);
610 /* Mark this VAR_DECL as dead so that we can tell we left it
611 there only for backward compatibility. */
612 DECL_DEAD_FOR_LOCAL (link) = 1;
614 /* Keep track of what should have happened when we
615 popped the binding. */
617 DECL_SHADOWED_FOR_VAR (link) = ob->value;
619 /* Add it to the list of dead variables in the next
620 outermost binding to that we can remove these when we
621 leave that binding. */
622 current_binding_level->level_chain->dead_vars_from_for
623 = tree_cons (NULL_TREE, link,
624 current_binding_level->level_chain->
627 /* Although we don't pop the cxx_binding, we do clear
628 its SCOPE since the scope is going away now. */
629 IDENTIFIER_BINDING (name)->scope
630 = current_binding_level->level_chain;
637 /* Remove the binding. */
640 if (TREE_CODE (decl) == TREE_LIST)
641 decl = TREE_VALUE (decl);
644 if (TREE_CODE (name) == OVERLOAD)
645 name = OVL_FUNCTION (name);
647 gcc_assert (DECL_P (name));
648 pop_binding (DECL_NAME (name), decl);
652 /* Remove declarations for any `for' variables from inner scopes
653 that we kept around. */
654 for (link = current_binding_level->dead_vars_from_for;
655 link; link = TREE_CHAIN (link))
656 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
658 /* Restore the IDENTIFIER_TYPE_VALUEs. */
659 for (link = current_binding_level->type_shadowed;
660 link; link = TREE_CHAIN (link))
661 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
663 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
664 for (link = current_binding_level->shadowed_labels;
666 link = TREE_CHAIN (link))
667 pop_label (TREE_VALUE (link), TREE_PURPOSE (link));
669 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
670 list if a `using' declaration put them there. The debugging
671 back-ends won't understand OVERLOAD, so we remove them here.
672 Because the BLOCK_VARS are (temporarily) shared with
673 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
674 popped all the bindings. */
679 for (d = &BLOCK_VARS (block); *d; )
681 if (TREE_CODE (*d) == TREE_LIST)
682 *d = TREE_CHAIN (*d);
684 d = &TREE_CHAIN (*d);
688 /* If the level being exited is the top level of a function,
689 check over all the labels. */
692 /* Since this is the top level block of a function, the vars are
693 the function's parameters. Don't leave them in the BLOCK
694 because they are found in the FUNCTION_DECL instead. */
695 BLOCK_VARS (block) = 0;
699 kind = current_binding_level->kind;
700 if (kind == sk_cleanup)
704 /* If this is a temporary binding created for a cleanup, then we'll
705 have pushed a statement list level. Pop that, create a new
706 BIND_EXPR for the block, and insert it into the stream. */
707 stmt = pop_stmt_list (current_binding_level->statement_list);
708 stmt = c_build_bind_expr (block, stmt);
714 DECL_INITIAL (current_function_decl) = block;
716 current_binding_level->blocks
717 = chainon (current_binding_level->blocks, block);
719 /* If we did not make a block for the level just exited,
720 any blocks made for inner levels
721 (since they cannot be recorded as subblocks in that level)
722 must be carried forward so they will later become subblocks
723 of something else. */
725 current_binding_level->blocks
726 = chainon (current_binding_level->blocks, subblocks);
728 /* Each and every BLOCK node created here in `poplevel' is important
729 (e.g. for proper debugging information) so if we created one
730 earlier, mark it as "used". */
732 TREE_USED (block) = 1;
734 /* All temporary bindings created for cleanups are popped silently. */
735 if (kind == sk_cleanup)
738 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
741 /* Insert BLOCK at the end of the list of subblocks of the
742 current binding level. This is used when a BIND_EXPR is expanded,
743 to handle the BLOCK node inside the BIND_EXPR. */
746 insert_block (tree block)
748 TREE_USED (block) = 1;
749 current_binding_level->blocks
750 = chainon (current_binding_level->blocks, block);
753 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
754 itself, calling F for each. The DATA is passed to F as well. */
757 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
760 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
762 result |= (*f) (namespace, data);
764 for (; current; current = TREE_CHAIN (current))
765 result |= walk_namespaces_r (current, f, data);
770 /* Walk all the namespaces, calling F for each. The DATA is passed to
774 walk_namespaces (walk_namespaces_fn f, void* data)
776 return walk_namespaces_r (global_namespace, f, data);
779 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
780 DATA is non-NULL, this is the last time we will call
781 wrapup_global_declarations for this NAMESPACE. */
784 wrapup_globals_for_namespace (tree namespace, void* data)
786 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
787 VEC(tree,gc) *statics = level->static_decls;
788 tree *vec = VEC_address (tree, statics);
789 int len = VEC_length (tree, statics);
790 int last_time = (data != 0);
794 check_global_declarations (vec, len);
798 /* Write out any globals that need to be output. */
799 return wrapup_global_declarations (vec, len);
803 /* In C++, you don't have to write `struct S' to refer to `S'; you
804 can just use `S'. We accomplish this by creating a TYPE_DECL as
805 if the user had written `typedef struct S S'. Create and return
806 the TYPE_DECL for TYPE. */
809 create_implicit_typedef (tree name, tree type)
813 decl = build_decl (TYPE_DECL, name, type);
814 DECL_ARTIFICIAL (decl) = 1;
815 /* There are other implicit type declarations, like the one *within*
816 a class that allows you to write `S::S'. We must distinguish
818 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
819 TYPE_NAME (type) = decl;
824 /* Remember a local name for name-mangling purposes. */
827 push_local_name (tree decl)
832 timevar_push (TV_NAME_LOOKUP);
834 name = DECL_NAME (decl);
836 nelts = VEC_length (tree, local_names);
837 for (i = 0; i < nelts; i++)
839 t = VEC_index (tree, local_names, i);
840 if (DECL_NAME (t) == name)
842 if (!DECL_LANG_SPECIFIC (decl))
843 retrofit_lang_decl (decl);
844 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
845 if (DECL_LANG_SPECIFIC (t))
846 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
848 DECL_DISCRIMINATOR (decl) = 1;
850 VEC_replace (tree, local_names, i, decl);
851 timevar_pop (TV_NAME_LOOKUP);
856 VEC_safe_push (tree, gc, local_names, decl);
857 timevar_pop (TV_NAME_LOOKUP);
860 /* Subroutine of duplicate_decls: return truthvalue of whether
861 or not types of these decls match.
863 For C++, we must compare the parameter list so that `int' can match
864 `int&' in a parameter position, but `int&' is not confused with
868 decls_match (tree newdecl, tree olddecl)
872 if (newdecl == olddecl)
875 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
876 /* If the two DECLs are not even the same kind of thing, we're not
877 interested in their types. */
880 if (TREE_CODE (newdecl) == FUNCTION_DECL)
882 tree f1 = TREE_TYPE (newdecl);
883 tree f2 = TREE_TYPE (olddecl);
884 tree p1 = TYPE_ARG_TYPES (f1);
885 tree p2 = TYPE_ARG_TYPES (f2);
887 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
888 && ! (DECL_EXTERN_C_P (newdecl)
889 && DECL_EXTERN_C_P (olddecl)))
892 if (TREE_CODE (f1) != TREE_CODE (f2))
895 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
897 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
898 && (DECL_BUILT_IN (olddecl)
899 #ifndef NO_IMPLICIT_EXTERN_C
900 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
901 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
905 types_match = self_promoting_args_p (p1);
906 if (p1 == void_list_node)
907 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
909 #ifndef NO_IMPLICIT_EXTERN_C
910 else if (p1 == NULL_TREE
911 && (DECL_EXTERN_C_P (olddecl)
912 && DECL_IN_SYSTEM_HEADER (olddecl)
913 && !DECL_CLASS_SCOPE_P (olddecl))
914 && (DECL_EXTERN_C_P (newdecl)
915 && DECL_IN_SYSTEM_HEADER (newdecl)
916 && !DECL_CLASS_SCOPE_P (newdecl)))
918 types_match = self_promoting_args_p (p2);
919 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
923 types_match = compparms (p1, p2);
928 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
930 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
931 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
934 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
935 DECL_TEMPLATE_PARMS (olddecl)))
938 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
939 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
940 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
942 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
943 DECL_TEMPLATE_RESULT (newdecl));
947 /* Need to check scope for variable declaration (VAR_DECL).
948 For typedef (TYPE_DECL), scope is ignored. */
949 if (TREE_CODE (newdecl) == VAR_DECL
950 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
953 if (TREE_TYPE (newdecl) == error_mark_node)
954 types_match = TREE_TYPE (olddecl) == error_mark_node;
955 else if (TREE_TYPE (olddecl) == NULL_TREE)
956 types_match = TREE_TYPE (newdecl) == NULL_TREE;
957 else if (TREE_TYPE (newdecl) == NULL_TREE)
960 types_match = comptypes (TREE_TYPE (newdecl),
962 COMPARE_REDECLARATION);
968 /* If NEWDECL is `static' and an `extern' was seen previously,
969 warn about it. OLDDECL is the previous declaration.
971 Note that this does not apply to the C++ case of declaring
972 a variable `extern const' and then later `const'.
974 Don't complain about built-in functions, since they are beyond
975 the user's control. */
978 warn_extern_redeclared_static (tree newdecl, tree olddecl)
982 if (TREE_CODE (newdecl) == TYPE_DECL
983 || TREE_CODE (newdecl) == TEMPLATE_DECL
984 || TREE_CODE (newdecl) == CONST_DECL
985 || TREE_CODE (newdecl) == NAMESPACE_DECL)
988 /* Don't get confused by static member functions; that's a different
990 if (TREE_CODE (newdecl) == FUNCTION_DECL
991 && DECL_STATIC_FUNCTION_P (newdecl))
994 /* If the old declaration was `static', or the new one isn't, then
995 then everything is OK. */
996 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
999 /* It's OK to declare a builtin function as `static'. */
1000 if (TREE_CODE (olddecl) == FUNCTION_DECL
1001 && DECL_ARTIFICIAL (olddecl))
1004 name = DECL_ASSEMBLER_NAME (newdecl);
1005 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1006 cp_pedwarn_at ("previous declaration of %qD", olddecl);
1009 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1010 If the redeclaration is invalid, a diagnostic is issued, and the
1011 error_mark_node is returned. Otherwise, OLDDECL is returned.
1013 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1017 duplicate_decls (tree newdecl, tree olddecl)
1019 unsigned olddecl_uid = DECL_UID (olddecl);
1020 int olddecl_friend = 0, types_match = 0;
1021 int new_defines_function = 0;
1023 if (newdecl == olddecl)
1026 types_match = decls_match (newdecl, olddecl);
1028 /* If either the type of the new decl or the type of the old decl is an
1029 error_mark_node, then that implies that we have already issued an
1030 error (earlier) for some bogus type specification, and in that case,
1031 it is rather pointless to harass the user with yet more error message
1032 about the same declaration, so just pretend the types match here. */
1033 if (TREE_TYPE (newdecl) == error_mark_node
1034 || TREE_TYPE (olddecl) == error_mark_node)
1037 if (DECL_P (olddecl)
1038 && TREE_CODE (newdecl) == FUNCTION_DECL
1039 && TREE_CODE (olddecl) == FUNCTION_DECL
1040 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1042 if (DECL_DECLARED_INLINE_P (newdecl)
1043 && DECL_UNINLINABLE (newdecl)
1044 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1045 /* Already warned elsewhere. */;
1046 else if (DECL_DECLARED_INLINE_P (olddecl)
1047 && DECL_UNINLINABLE (olddecl)
1048 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1049 /* Already warned. */;
1050 else if (DECL_DECLARED_INLINE_P (newdecl)
1051 && DECL_UNINLINABLE (olddecl)
1052 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1054 warning (OPT_Wattributes, "%Jfunction %qD redeclared as inline",
1056 warning (OPT_Wattributes, "%Jprevious declaration of %qD "
1057 "with attribute noinline", olddecl, olddecl);
1059 else if (DECL_DECLARED_INLINE_P (olddecl)
1060 && DECL_UNINLINABLE (newdecl)
1061 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1063 warning (OPT_Wattributes, "%Jfunction %qD redeclared with "
1064 "attribute noinline", newdecl, newdecl);
1065 warning (OPT_Wattributes, "%Jprevious declaration of %qD was inline",
1070 /* Check for redeclaration and other discrepancies. */
1071 if (TREE_CODE (olddecl) == FUNCTION_DECL
1072 && DECL_ARTIFICIAL (olddecl))
1074 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1076 /* Avoid warnings redeclaring anticipated built-ins. */
1077 if (DECL_ANTICIPATED (olddecl))
1080 /* If you declare a built-in or predefined function name as static,
1081 the old definition is overridden, but optionally warn this was a
1082 bad choice of name. */
1083 if (! TREE_PUBLIC (newdecl))
1086 warning (0, "shadowing %s function %q#D",
1087 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1089 /* Discard the old built-in function. */
1092 /* If the built-in is not ansi, then programs can override
1093 it even globally without an error. */
1094 else if (! DECL_BUILT_IN (olddecl))
1095 warning (0, "library function %q#D redeclared as non-function %q#D",
1099 error ("declaration of %q#D", newdecl);
1100 error ("conflicts with built-in declaration %q#D",
1105 else if (!types_match)
1107 /* Avoid warnings redeclaring anticipated built-ins. */
1108 if (DECL_ANTICIPATED (olddecl))
1110 /* Deal with fileptr_type_node. FILE type is not known
1111 at the time we create the builtins. */
1114 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1115 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1117 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1120 else if (TREE_VALUE (t2) == fileptr_type_node)
1122 tree t = TREE_VALUE (t1);
1124 if (TREE_CODE (t) == POINTER_TYPE
1125 && TYPE_NAME (TREE_TYPE (t))
1126 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1127 == get_identifier ("FILE")
1128 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1130 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1132 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1133 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1134 types_match = decls_match (newdecl, olddecl);
1136 return duplicate_decls (newdecl, olddecl);
1137 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1140 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1143 else if ((DECL_EXTERN_C_P (newdecl)
1144 && DECL_EXTERN_C_P (olddecl))
1145 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1146 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1148 /* A near match; override the builtin. */
1150 if (TREE_PUBLIC (newdecl))
1152 warning (0, "new declaration %q#D", newdecl);
1153 warning (0, "ambiguates built-in declaration %q#D",
1156 else if (warn_shadow)
1157 warning (0, "shadowing %s function %q#D",
1158 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1162 /* Discard the old built-in function. */
1165 /* Replace the old RTL to avoid problems with inlining. */
1166 COPY_DECL_RTL (newdecl, olddecl);
1168 /* Even if the types match, prefer the new declarations type
1169 for anticipated built-ins, for exception lists, etc... */
1170 else if (DECL_ANTICIPATED (olddecl))
1172 tree type = TREE_TYPE (newdecl);
1173 tree attribs = (*targetm.merge_type_attributes)
1174 (TREE_TYPE (olddecl), type);
1176 type = cp_build_type_attribute_variant (type, attribs);
1177 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1180 /* Whether or not the builtin can throw exceptions has no
1181 bearing on this declarator. */
1182 TREE_NOTHROW (olddecl) = 0;
1184 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1186 /* If a builtin function is redeclared as `static', merge
1187 the declarations, but make the original one static. */
1188 DECL_THIS_STATIC (olddecl) = 1;
1189 TREE_PUBLIC (olddecl) = 0;
1191 /* Make the old declaration consistent with the new one so
1192 that all remnants of the builtin-ness of this function
1193 will be banished. */
1194 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1195 COPY_DECL_RTL (newdecl, olddecl);
1198 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1200 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1201 && TREE_CODE (newdecl) != TYPE_DECL
1202 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1203 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1204 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1205 && TREE_CODE (olddecl) != TYPE_DECL
1206 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1207 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1210 /* We do nothing special here, because C++ does such nasty
1211 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1212 get shadowed, and know that if we need to find a TYPE_DECL
1213 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1214 slot of the identifier. */
1218 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1219 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1220 || (TREE_CODE (olddecl) == FUNCTION_DECL
1221 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1224 error ("%q#D redeclared as different kind of symbol", newdecl);
1225 if (TREE_CODE (olddecl) == TREE_LIST)
1226 olddecl = TREE_VALUE (olddecl);
1227 cp_error_at ("previous declaration of %q#D", olddecl);
1229 return error_mark_node;
1231 else if (!types_match)
1233 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1234 /* These are certainly not duplicate declarations; they're
1235 from different scopes. */
1238 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1240 /* The name of a class template may not be declared to refer to
1241 any other template, class, function, object, namespace, value,
1242 or type in the same scope. */
1243 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1244 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1246 error ("declaration of template %q#D", newdecl);
1247 cp_error_at ("conflicts with previous declaration %q#D",
1250 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1251 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1252 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1253 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1254 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1255 DECL_TEMPLATE_PARMS (olddecl))
1256 /* Template functions can be disambiguated by
1258 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1259 TREE_TYPE (TREE_TYPE (olddecl))))
1261 error ("new declaration %q#D", newdecl);
1262 cp_error_at ("ambiguates old declaration %q#D", olddecl);
1266 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1268 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1270 error ("declaration of C function %q#D conflicts with",
1272 cp_error_at ("previous declaration %q#D here", olddecl);
1274 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1275 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1277 error ("new declaration %q#D", newdecl);
1278 cp_error_at ("ambiguates old declaration %q#D", olddecl);
1285 error ("conflicting declaration %q#D", newdecl);
1286 cp_error_at ("%qD has a previous declaration as %q#D",
1288 return error_mark_node;
1291 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1292 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1293 && (!DECL_TEMPLATE_INFO (newdecl)
1294 || (DECL_TI_TEMPLATE (newdecl)
1295 != DECL_TI_TEMPLATE (olddecl))))
1296 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1297 && (!DECL_TEMPLATE_INFO (olddecl)
1298 || (DECL_TI_TEMPLATE (olddecl)
1299 != DECL_TI_TEMPLATE (newdecl))))))
1300 /* It's OK to have a template specialization and a non-template
1301 with the same type, or to have specializations of two
1302 different templates with the same type. Note that if one is a
1303 specialization, and the other is an instantiation of the same
1304 template, that we do not exit at this point. That situation
1305 can occur if we instantiate a template class, and then
1306 specialize one of its methods. This situation is valid, but
1307 the declarations must be merged in the usual way. */
1309 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1310 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1311 && !DECL_USE_TEMPLATE (newdecl))
1312 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1313 && !DECL_USE_TEMPLATE (olddecl))))
1314 /* One of the declarations is a template instantiation, and the
1315 other is not a template at all. That's OK. */
1317 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1319 /* In [namespace.alias] we have:
1321 In a declarative region, a namespace-alias-definition can be
1322 used to redefine a namespace-alias declared in that declarative
1323 region to refer only to the namespace to which it already
1326 Therefore, if we encounter a second alias directive for the same
1327 alias, we can just ignore the second directive. */
1328 if (DECL_NAMESPACE_ALIAS (newdecl)
1329 && (DECL_NAMESPACE_ALIAS (newdecl)
1330 == DECL_NAMESPACE_ALIAS (olddecl)))
1332 /* [namespace.alias]
1334 A namespace-name or namespace-alias shall not be declared as
1335 the name of any other entity in the same declarative region.
1336 A namespace-name defined at global scope shall not be
1337 declared as the name of any other entity in any global scope
1339 error ("declaration of namespace %qD conflicts with", newdecl);
1340 cp_error_at ("previous declaration of namespace %qD here", olddecl);
1341 return error_mark_node;
1345 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1348 error (errmsg, newdecl);
1349 if (DECL_NAME (olddecl) != NULL_TREE)
1350 cp_error_at ((DECL_INITIAL (olddecl)
1351 && namespace_bindings_p ())
1352 ? "%q#D previously defined here"
1353 : "%q#D previously declared here", olddecl);
1354 return error_mark_node;
1356 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1357 && DECL_INITIAL (olddecl) != NULL_TREE
1358 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1359 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1361 /* Prototype decl follows defn w/o prototype. */
1362 cp_warning_at ("prototype for %q#D", newdecl);
1363 warning (0, "%Jfollows non-prototype definition here", olddecl);
1365 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1366 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1368 /* extern "C" int foo ();
1369 int foo () { bar (); }
1371 if (current_lang_depth () == 0)
1372 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1375 cp_error_at ("previous declaration of %q#D with %qL linkage",
1376 olddecl, DECL_LANGUAGE (olddecl));
1377 error ("conflicts with new declaration with %qL linkage",
1378 DECL_LANGUAGE (newdecl));
1382 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1384 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1386 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1387 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1390 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1391 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1393 for (; t1 && t1 != void_list_node;
1394 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1395 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1397 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1400 pedwarn ("default argument given for parameter %d of %q#D",
1402 cp_pedwarn_at ("after previous specification in %q#D",
1407 error ("default argument given for parameter %d of %q#D",
1409 cp_error_at ("after previous specification in %q#D",
1414 if (DECL_DECLARED_INLINE_P (newdecl)
1415 && ! DECL_DECLARED_INLINE_P (olddecl)
1416 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1418 warning (0, "%q#D was used before it was declared inline", newdecl);
1419 warning (0, "%Jprevious non-inline declaration here", olddecl);
1424 /* Do not merge an implicit typedef with an explicit one. In:
1428 typedef class A A __attribute__ ((foo));
1430 the attribute should apply only to the typedef. */
1431 if (TREE_CODE (olddecl) == TYPE_DECL
1432 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1433 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1436 /* If new decl is `static' and an `extern' was seen previously,
1438 warn_extern_redeclared_static (newdecl, olddecl);
1440 /* We have committed to returning 1 at this point. */
1441 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1443 /* Now that functions must hold information normally held
1444 by field decls, there is extra work to do so that
1445 declaration information does not get destroyed during
1447 if (DECL_VINDEX (olddecl))
1448 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1449 if (DECL_CONTEXT (olddecl))
1450 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1451 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1452 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1453 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1454 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1455 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1456 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1457 SET_OVERLOADED_OPERATOR_CODE
1458 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1459 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1461 /* Optionally warn about more than one declaration for the same
1462 name, but don't warn about a function declaration followed by a
1464 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1465 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1466 /* Don't warn about extern decl followed by definition. */
1467 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1468 /* Don't warn about friends, let add_friend take care of it. */
1469 && ! (DECL_FRIEND_P (newdecl) || DECL_FRIEND_P (olddecl)))
1471 warning (0, "redundant redeclaration of %qD in same scope", newdecl);
1472 cp_warning_at ("previous declaration of %qD", olddecl);
1476 /* Deal with C++: must preserve virtual function table size. */
1477 if (TREE_CODE (olddecl) == TYPE_DECL)
1479 tree newtype = TREE_TYPE (newdecl);
1480 tree oldtype = TREE_TYPE (olddecl);
1482 if (newtype != error_mark_node && oldtype != error_mark_node
1483 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1484 CLASSTYPE_FRIEND_CLASSES (newtype)
1485 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1487 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1490 /* Copy all the DECL_... slots specified in the new decl
1491 except for any that we copy here from the old type. */
1492 DECL_ATTRIBUTES (newdecl)
1493 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1495 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1497 TREE_TYPE (olddecl) = TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl));
1498 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1499 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1500 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1502 /* If the new declaration is a definition, update the file and
1503 line information on the declaration. */
1504 if (DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)) == NULL_TREE
1505 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl)) != NULL_TREE)
1507 DECL_SOURCE_LOCATION (olddecl)
1508 = DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (olddecl))
1509 = DECL_SOURCE_LOCATION (newdecl);
1510 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1511 DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (olddecl))
1512 = DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (newdecl));
1515 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1517 DECL_INLINE (DECL_TEMPLATE_RESULT (olddecl))
1518 |= DECL_INLINE (DECL_TEMPLATE_RESULT (newdecl));
1519 DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (olddecl))
1520 |= DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (newdecl));
1528 /* Automatically handles default parameters. */
1529 tree oldtype = TREE_TYPE (olddecl);
1532 /* Merge the data types specified in the two decls. */
1533 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1535 /* If merge_types produces a non-typedef type, just use the old type. */
1536 if (TREE_CODE (newdecl) == TYPE_DECL
1537 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1540 if (TREE_CODE (newdecl) == VAR_DECL)
1542 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1543 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1544 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1545 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1548 /* Do this after calling `merge_types' so that default
1549 parameters don't confuse us. */
1550 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1551 && (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl))
1552 != TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl))))
1554 TREE_TYPE (newdecl) = build_exception_variant (newtype,
1555 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)));
1556 TREE_TYPE (olddecl) = build_exception_variant (newtype,
1557 TYPE_RAISES_EXCEPTIONS (oldtype));
1559 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (olddecl))
1560 && ! DECL_IS_BUILTIN (olddecl)
1562 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)),
1563 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl)), 1))
1565 error ("declaration of %qF throws different exceptions",
1567 cp_error_at ("than previous declaration %qF", olddecl);
1570 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1572 /* Lay the type out, unless already done. */
1573 if (! same_type_p (newtype, oldtype)
1574 && TREE_TYPE (newdecl) != error_mark_node
1575 && !(processing_template_decl && uses_template_parms (newdecl)))
1576 layout_type (TREE_TYPE (newdecl));
1578 if ((TREE_CODE (newdecl) == VAR_DECL
1579 || TREE_CODE (newdecl) == PARM_DECL
1580 || TREE_CODE (newdecl) == RESULT_DECL
1581 || TREE_CODE (newdecl) == FIELD_DECL
1582 || TREE_CODE (newdecl) == TYPE_DECL)
1583 && !(processing_template_decl && uses_template_parms (newdecl)))
1584 layout_decl (newdecl, 0);
1586 /* Merge the type qualifiers. */
1587 if (TREE_READONLY (newdecl))
1588 TREE_READONLY (olddecl) = 1;
1589 if (TREE_THIS_VOLATILE (newdecl))
1590 TREE_THIS_VOLATILE (olddecl) = 1;
1591 if (TREE_NOTHROW (newdecl))
1592 TREE_NOTHROW (olddecl) = 1;
1594 /* Merge deprecatedness. */
1595 if (TREE_DEPRECATED (newdecl))
1596 TREE_DEPRECATED (olddecl) = 1;
1598 /* Merge the initialization information. */
1599 if (DECL_INITIAL (newdecl) == NULL_TREE
1600 && DECL_INITIAL (olddecl) != NULL_TREE)
1602 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1603 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1604 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1605 && DECL_LANG_SPECIFIC (newdecl)
1606 && DECL_LANG_SPECIFIC (olddecl))
1608 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1609 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1613 /* Merge the section attribute.
1614 We want to issue an error if the sections conflict but that must be
1615 done later in decl_attributes since we are called before attributes
1617 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1618 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1620 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1622 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1623 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1624 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1625 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1626 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1627 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1628 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1629 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1630 /* Keep the old RTL. */
1631 COPY_DECL_RTL (olddecl, newdecl);
1633 else if (TREE_CODE (newdecl) == VAR_DECL
1634 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1636 /* Keep the old RTL. We cannot keep the old RTL if the old
1637 declaration was for an incomplete object and the new
1638 declaration is not since many attributes of the RTL will
1640 COPY_DECL_RTL (olddecl, newdecl);
1643 /* If cannot merge, then use the new type and qualifiers,
1644 and don't preserve the old rtl. */
1647 /* Clean out any memory we had of the old declaration. */
1648 tree oldstatic = value_member (olddecl, static_aggregates);
1650 TREE_VALUE (oldstatic) = error_mark_node;
1652 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1653 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1654 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1655 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1658 /* Merge the storage class information. */
1659 merge_weak (newdecl, olddecl);
1661 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1662 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1663 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1664 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1665 if (! DECL_EXTERNAL (olddecl))
1666 DECL_EXTERNAL (newdecl) = 0;
1668 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1670 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1671 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1672 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1673 DECL_TEMPLATE_INSTANTIATED (newdecl)
1674 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1676 /* If the OLDDECL is an instantiation and/or specialization,
1677 then the NEWDECL must be too. But, it may not yet be marked
1678 as such if the caller has created NEWDECL, but has not yet
1679 figured out that it is a redeclaration. */
1680 if (!DECL_USE_TEMPLATE (newdecl))
1681 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1683 /* Don't really know how much of the language-specific
1684 values we should copy from old to new. */
1685 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1686 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1687 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1688 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1689 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1690 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1691 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1692 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1693 olddecl_friend = DECL_FRIEND_P (olddecl);
1695 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1696 if (TREE_CODE (newdecl) == FUNCTION_DECL
1697 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1699 DECL_BEFRIENDING_CLASSES (newdecl)
1700 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1701 DECL_BEFRIENDING_CLASSES (olddecl));
1702 /* DECL_THUNKS is only valid for virtual functions,
1703 otherwise it is a DECL_FRIEND_CONTEXT. */
1704 if (DECL_VIRTUAL_P (newdecl))
1705 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1709 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1711 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1712 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1714 /* If newdecl is not a specialization, then it is not a
1715 template-related function at all. And that means that we
1716 should have exited above, returning 0. */
1717 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1719 if (TREE_USED (olddecl))
1720 /* From [temp.expl.spec]:
1722 If a template, a member template or the member of a class
1723 template is explicitly specialized then that
1724 specialization shall be declared before the first use of
1725 that specialization that would cause an implicit
1726 instantiation to take place, in every translation unit in
1727 which such a use occurs. */
1728 error ("explicit specialization of %qD after first use",
1731 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1733 /* [temp.expl.spec/14] We don't inline explicit specialization
1734 just because the primary template says so. */
1738 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1739 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1741 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1743 /* If either decl says `inline', this fn is inline, unless
1744 its definition was passed already. */
1745 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1746 DECL_INLINE (olddecl) = 1;
1747 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1749 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1750 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1753 /* Preserve abstractness on cloned [cd]tors. */
1754 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1758 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1759 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1760 COPY_DECL_RTL (newdecl, olddecl);
1762 if (! types_match || new_defines_function)
1764 /* These need to be copied so that the names are available.
1765 Note that if the types do match, we'll preserve inline
1766 info and other bits, but if not, we won't. */
1767 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1768 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1770 if (new_defines_function)
1771 /* If defining a function declared with other language
1772 linkage, use the previously declared language linkage. */
1773 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1774 else if (types_match)
1776 /* If redeclaring a builtin function, and not a definition,
1777 it stays built in. */
1778 if (DECL_BUILT_IN (olddecl))
1780 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1781 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1782 /* If we're keeping the built-in definition, keep the rtl,
1783 regardless of declaration matches. */
1784 COPY_DECL_RTL (olddecl, newdecl);
1787 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1788 /* Don't clear out the arguments if we're redefining a function. */
1789 if (DECL_ARGUMENTS (olddecl))
1790 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1793 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1794 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1796 /* Now preserve various other info from the definition. */
1797 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1798 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1799 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1800 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1802 /* Warn about conflicting visibility specifications. */
1803 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1804 && DECL_VISIBILITY_SPECIFIED (newdecl)
1805 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1807 warning (OPT_Wattributes, "%J%qD: visibility attribute ignored "
1808 "because it", newdecl, newdecl);
1809 warning (OPT_Wattributes, "%Jconflicts with previous "
1810 "declaration here", olddecl);
1812 /* Choose the declaration which specified visibility. */
1813 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1815 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1816 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1819 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1820 with that from NEWDECL below. */
1821 if (DECL_LANG_SPECIFIC (olddecl))
1823 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1824 != DECL_LANG_SPECIFIC (newdecl));
1825 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1828 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1832 function_size = sizeof (struct tree_decl);
1834 memcpy ((char *) olddecl + sizeof (struct tree_common),
1835 (char *) newdecl + sizeof (struct tree_common),
1836 function_size - sizeof (struct tree_common));
1838 if (DECL_TEMPLATE_INSTANTIATION (newdecl))
1839 /* If newdecl is a template instantiation, it is possible that
1840 the following sequence of events has occurred:
1842 o A friend function was declared in a class template. The
1843 class template was instantiated.
1845 o The instantiation of the friend declaration was
1846 recorded on the instantiation list, and is newdecl.
1848 o Later, however, instantiate_class_template called pushdecl
1849 on the newdecl to perform name injection. But, pushdecl in
1850 turn called duplicate_decls when it discovered that another
1851 declaration of a global function with the same name already
1854 o Here, in duplicate_decls, we decided to clobber newdecl.
1856 If we're going to do that, we'd better make sure that
1857 olddecl, and not newdecl, is on the list of
1858 instantiations so that if we try to do the instantiation
1859 again we won't get the clobbered declaration. */
1860 reregister_specialization (newdecl,
1861 DECL_TI_TEMPLATE (newdecl),
1866 memcpy ((char *) olddecl + sizeof (struct tree_common),
1867 (char *) newdecl + sizeof (struct tree_common),
1868 sizeof (struct tree_decl) - sizeof (struct tree_common)
1869 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1872 DECL_UID (olddecl) = olddecl_uid;
1874 DECL_FRIEND_P (olddecl) = 1;
1876 /* NEWDECL contains the merged attribute lists.
1877 Update OLDDECL to be the same. */
1878 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1880 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1881 so that encode_section_info has a chance to look at the new decl
1882 flags and attributes. */
1883 if (DECL_RTL_SET_P (olddecl)
1884 && (TREE_CODE (olddecl) == FUNCTION_DECL
1885 || (TREE_CODE (olddecl) == VAR_DECL
1886 && TREE_STATIC (olddecl))))
1887 make_decl_rtl (olddecl);
1889 /* The NEWDECL will no longer be needed. Because every out-of-class
1890 declaration of a member results in a call to duplicate_decls,
1891 freeing these nodes represents in a significant savings. */
1897 /* Return zero if the declaration NEWDECL is valid
1898 when the declaration OLDDECL (assumed to be for the same name)
1899 has already been seen.
1900 Otherwise return an error message format string with a %s
1901 where the identifier should go. */
1904 redeclaration_error_message (tree newdecl, tree olddecl)
1906 if (TREE_CODE (newdecl) == TYPE_DECL)
1908 /* Because C++ can put things into name space for free,
1909 constructs like "typedef struct foo { ... } foo"
1910 would look like an erroneous redeclaration. */
1911 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1914 return "redefinition of %q#D";
1916 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1918 /* If this is a pure function, its olddecl will actually be
1919 the original initialization to `0' (which we force to call
1920 abort()). Don't complain about redefinition in this case. */
1921 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1922 && DECL_INITIAL (olddecl) == NULL_TREE)
1925 /* If both functions come from different namespaces, this is not
1926 a redeclaration - this is a conflict with a used function. */
1927 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1928 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1929 && ! decls_match (olddecl, newdecl))
1930 return "%qD conflicts with used function";
1932 /* We'll complain about linkage mismatches in
1933 warn_extern_redeclared_static. */
1935 /* Defining the same name twice is no good. */
1936 if (DECL_INITIAL (olddecl) != NULL_TREE
1937 && DECL_INITIAL (newdecl) != NULL_TREE)
1939 if (DECL_NAME (olddecl) == NULL_TREE)
1940 return "%q#D not declared in class";
1942 return "redefinition of %q#D";
1946 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1950 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1952 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
1953 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
1954 return "redefinition of %q#D";
1958 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
1959 || (DECL_TEMPLATE_RESULT (newdecl)
1960 == DECL_TEMPLATE_RESULT (olddecl)))
1963 nt = DECL_TEMPLATE_RESULT (newdecl);
1964 if (DECL_TEMPLATE_INFO (nt))
1965 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
1966 ot = DECL_TEMPLATE_RESULT (olddecl);
1967 if (DECL_TEMPLATE_INFO (ot))
1968 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
1969 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
1970 return "redefinition of %q#D";
1974 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
1976 /* Objects declared at top level: */
1977 /* If at least one is a reference, it's ok. */
1978 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1980 /* Reject two definitions. */
1981 return "redefinition of %q#D";
1985 /* Objects declared with block scope: */
1986 /* Reject two definitions, and reject a definition
1987 together with an external reference. */
1988 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
1989 return "redeclaration of %q#D";
1994 /* Create a new label, named ID. */
1997 make_label_decl (tree id, int local_p)
2001 decl = build_decl (LABEL_DECL, id, void_type_node);
2003 DECL_CONTEXT (decl) = current_function_decl;
2004 DECL_MODE (decl) = VOIDmode;
2005 C_DECLARED_LABEL_FLAG (decl) = local_p;
2007 /* Say where one reference is to the label, for the sake of the
2008 error if it is not defined. */
2009 DECL_SOURCE_LOCATION (decl) = input_location;
2011 /* Record the fact that this identifier is bound to this label. */
2012 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2017 /* Record this label on the list of used labels so that we can check
2018 at the end of the function to see whether or not the label was
2019 actually defined, and so we can check when the label is defined whether
2020 this use is valid. */
2023 use_label (tree decl)
2025 if (named_label_uses == NULL
2026 || named_label_uses->names_in_scope != current_binding_level->names
2027 || named_label_uses->label_decl != decl)
2029 struct named_label_use_list *new_ent;
2030 new_ent = GGC_NEW (struct named_label_use_list);
2031 new_ent->label_decl = decl;
2032 new_ent->names_in_scope = current_binding_level->names;
2033 new_ent->binding_level = current_binding_level;
2034 new_ent->o_goto_locus = input_location;
2035 new_ent->next = named_label_uses;
2036 named_label_uses = new_ent;
2040 /* Look for a label named ID in the current function. If one cannot
2041 be found, create one. (We keep track of used, but undefined,
2042 labels, and complain about them at the end of a function.) */
2045 lookup_label (tree id)
2048 struct named_label_list *ent;
2050 timevar_push (TV_NAME_LOOKUP);
2051 /* You can't use labels at global scope. */
2052 if (current_function_decl == NULL_TREE)
2054 error ("label %qE referenced outside of any function", id);
2055 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2058 /* See if we've already got this label. */
2059 decl = IDENTIFIER_LABEL_VALUE (id);
2060 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2061 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2063 /* Record this label on the list of labels used in this function.
2064 We do this before calling make_label_decl so that we get the
2065 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2066 ent = GGC_CNEW (struct named_label_list);
2067 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2068 ent->next = named_labels;
2071 /* We need a new label. */
2072 decl = make_label_decl (id, /*local_p=*/0);
2074 /* Now fill in the information we didn't have before. */
2075 ent->label_decl = decl;
2077 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2080 /* Declare a local label named ID. */
2083 declare_local_label (tree id)
2087 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2088 this scope we can restore the old value of
2089 IDENTIFIER_TYPE_VALUE. */
2090 current_binding_level->shadowed_labels
2091 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2092 current_binding_level->shadowed_labels);
2093 /* Look for the label. */
2094 decl = make_label_decl (id, /*local_p=*/1);
2095 /* Now fill in the information we didn't have before. */
2096 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2101 /* Returns nonzero if it is ill-formed to jump past the declaration of
2102 DECL. Returns 2 if it's also a real problem. */
2105 decl_jump_unsafe (tree decl)
2107 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
2110 if (DECL_INITIAL (decl) == NULL_TREE
2111 && pod_type_p (TREE_TYPE (decl)))
2114 /* This is really only important if we're crossing an initialization.
2115 The POD stuff is just pedantry; why should it matter if the class
2116 contains a field of pointer to member type? */
2117 if (DECL_INITIAL (decl)
2118 || (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))))
2123 /* Check that a single previously seen jump to a newly defined label
2124 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2125 the jump context; NAMES are the names in scope in LEVEL at the jump
2126 context; FILE and LINE are the source position of the jump or 0. */
2129 check_previous_goto_1 (tree decl,
2130 struct cp_binding_level* level,
2131 tree names, const location_t *locus)
2135 struct cp_binding_level *b = current_binding_level;
2136 for (; b; b = b->level_chain)
2138 tree new_decls = b->names;
2139 tree old_decls = (b == level ? names : NULL_TREE);
2140 for (; new_decls != old_decls;
2141 new_decls = TREE_CHAIN (new_decls))
2143 int problem = decl_jump_unsafe (new_decls);
2150 pedwarn ("jump to label %qD", decl);
2152 pedwarn ("jump to case label");
2155 pedwarn ("%H from here", locus);
2160 cp_error_at (" crosses initialization of %q#D",
2163 cp_pedwarn_at (" enters scope of non-POD %q#D",
2169 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2174 pedwarn ("jump to label %qD", decl);
2176 pedwarn ("jump to case label");
2179 pedwarn ("%H from here", locus);
2182 if (b->kind == sk_try)
2183 error (" enters try block");
2185 error (" enters catch block");
2192 check_previous_goto (struct named_label_use_list* use)
2194 check_previous_goto_1 (use->label_decl, use->binding_level,
2195 use->names_in_scope, &use->o_goto_locus);
2199 check_switch_goto (struct cp_binding_level* level)
2201 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2204 /* Check that any previously seen jumps to a newly defined label DECL
2205 are OK. Called by define_label. */
2208 check_previous_gotos (tree decl)
2210 struct named_label_use_list **usep;
2212 if (! TREE_USED (decl))
2215 for (usep = &named_label_uses; *usep; )
2217 struct named_label_use_list *use = *usep;
2218 if (use->label_decl == decl)
2220 check_previous_goto (use);
2224 usep = &(use->next);
2228 /* Check that a new jump to a label DECL is OK. Called by
2229 finish_goto_stmt. */
2232 check_goto (tree decl)
2236 struct named_label_list *lab;
2238 /* We can't know where a computed goto is jumping. So we assume
2240 if (! DECL_P (decl))
2243 /* If the label hasn't been defined yet, defer checking. */
2244 if (! DECL_INITIAL (decl))
2250 for (lab = named_labels; lab; lab = lab->next)
2251 if (decl == lab->label_decl)
2254 /* If the label is not on named_labels it's a gcc local label, so
2255 it must be in an outer scope, so jumping to it is always OK. */
2259 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2262 cp_pedwarn_at ("jump to label %qD", decl);
2263 pedwarn (" from here");
2267 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2269 tree b = TREE_VALUE (bad);
2270 int u = decl_jump_unsafe (b);
2272 if (u > 1 && DECL_ARTIFICIAL (b))
2273 /* Can't skip init of __exception_info. */
2274 error ("%J enters catch block", b);
2276 cp_error_at (" skips initialization of %q#D", b);
2278 cp_pedwarn_at (" enters scope of non-POD %q#D", b);
2281 if (lab->in_try_scope)
2282 error (" enters try block");
2283 else if (lab->in_catch_scope)
2284 error (" enters catch block");
2287 /* Define a label, specifying the location in the source file.
2288 Return the LABEL_DECL node for the label. */
2291 define_label (location_t location, tree name)
2293 tree decl = lookup_label (name);
2294 struct named_label_list *ent;
2295 struct cp_binding_level *p;
2297 timevar_push (TV_NAME_LOOKUP);
2298 for (ent = named_labels; ent; ent = ent->next)
2299 if (ent->label_decl == decl)
2302 /* After labels, make any new cleanups in the function go into their
2303 own new (temporary) binding contour. */
2304 for (p = current_binding_level;
2305 p->kind != sk_function_parms;
2307 p->more_cleanups_ok = 0;
2309 if (name == get_identifier ("wchar_t"))
2310 pedwarn ("label named wchar_t");
2312 if (DECL_INITIAL (decl) != NULL_TREE)
2313 error ("duplicate label %qD", decl);
2316 /* Mark label as having been defined. */
2317 DECL_INITIAL (decl) = error_mark_node;
2318 /* Say where in the source. */
2319 DECL_SOURCE_LOCATION (decl) = location;
2322 ent->names_in_scope = current_binding_level->names;
2323 ent->binding_level = current_binding_level;
2325 check_previous_gotos (decl);
2328 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2333 struct cp_binding_level *level;
2334 struct cp_switch *next;
2335 /* The SWITCH_STMT being built. */
2337 /* A splay-tree mapping the low element of a case range to the high
2338 element, or NULL_TREE if there is no high element. Used to
2339 determine whether or not a new case label duplicates an old case
2340 label. We need a tree, rather than simply a hash table, because
2341 of the GNU case range extension. */
2345 /* A stack of the currently active switch statements. The innermost
2346 switch statement is on the top of the stack. There is no need to
2347 mark the stack for garbage collection because it is only active
2348 during the processing of the body of a function, and we never
2349 collect at that point. */
2351 static struct cp_switch *switch_stack;
2353 /* Called right after a switch-statement condition is parsed.
2354 SWITCH_STMT is the switch statement being parsed. */
2357 push_switch (tree switch_stmt)
2359 struct cp_switch *p = xmalloc (sizeof (struct cp_switch));
2360 p->level = current_binding_level;
2361 p->next = switch_stack;
2362 p->switch_stmt = switch_stmt;
2363 p->cases = splay_tree_new (case_compare, NULL, NULL);
2370 struct cp_switch *cs = switch_stack;
2371 location_t switch_location;
2373 /* Emit warnings as needed. */
2374 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2375 switch_location = EXPR_LOCATION (cs->switch_stmt);
2377 switch_location = input_location;
2378 c_do_switch_warnings (cs->cases, switch_location,
2379 SWITCH_STMT_TYPE (cs->switch_stmt),
2380 SWITCH_STMT_COND (cs->switch_stmt));
2382 splay_tree_delete (cs->cases);
2383 switch_stack = switch_stack->next;
2387 /* Note that we've seen a definition of a case label, and complain if this
2388 is a bad place for one. */
2391 finish_case_label (tree low_value, tree high_value)
2394 struct cp_binding_level *p;
2396 if (processing_template_decl)
2400 /* For templates, just add the case label; we'll do semantic
2401 analysis at instantiation-time. */
2402 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2403 return add_stmt (build_case_label (low_value, high_value, label));
2406 /* Find the condition on which this switch statement depends. */
2407 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2408 if (cond && TREE_CODE (cond) == TREE_LIST)
2409 cond = TREE_VALUE (cond);
2411 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2412 low_value, high_value);
2414 check_switch_goto (switch_stack->level);
2416 /* After labels, make any new cleanups in the function go into their
2417 own new (temporary) binding contour. */
2418 for (p = current_binding_level;
2419 p->kind != sk_function_parms;
2421 p->more_cleanups_ok = 0;
2426 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2429 typename_hash (const void* k)
2434 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2435 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2440 typedef struct typename_info {
2448 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2451 typename_compare (const void * k1, const void * k2)
2454 const typename_info *t2;
2457 t2 = (const typename_info *) k2;
2459 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2460 && TYPE_CONTEXT (t1) == t2->scope
2461 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2462 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2463 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2466 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2467 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2469 Returns the new TYPENAME_TYPE. */
2471 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2474 build_typename_type (tree context, tree name, tree fullname,
2475 enum tag_types tag_type)
2483 if (typename_htab == NULL)
2484 typename_htab = htab_create_ggc (61, &typename_hash,
2485 &typename_compare, NULL);
2487 ti.scope = FROB_CONTEXT (context);
2489 ti.template_id = fullname;
2490 ti.enum_p = tag_type == enum_type;
2491 ti.class_p = (tag_type == class_type
2492 || tag_type == record_type
2493 || tag_type == union_type);
2494 hash = (htab_hash_pointer (ti.scope)
2495 ^ htab_hash_pointer (ti.name));
2497 /* See if we already have this type. */
2498 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2503 /* Build the TYPENAME_TYPE. */
2504 t = make_aggr_type (TYPENAME_TYPE);
2505 TYPE_CONTEXT (t) = ti.scope;
2506 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2507 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2508 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2510 /* Build the corresponding TYPE_DECL. */
2511 d = build_decl (TYPE_DECL, name, t);
2512 TYPE_NAME (TREE_TYPE (d)) = d;
2513 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2514 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2515 DECL_ARTIFICIAL (d) = 1;
2517 /* Store it in the hash table. */
2524 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2525 provided to name the type. Returns an appropriate type, unless an
2526 error occurs, in which case error_mark_node is returned. If we
2527 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2528 return that, rather than the _TYPE it corresponds to, in other
2529 cases we look through the type decl. If TF_ERROR is set, complain
2530 about errors, otherwise be quiet. */
2533 make_typename_type (tree context, tree name, enum tag_types tag_type,
2534 tsubst_flags_t complain)
2538 if (name == error_mark_node
2539 || context == NULL_TREE
2540 || context == error_mark_node)
2541 return error_mark_node;
2545 if (!(TYPE_LANG_SPECIFIC (name)
2546 && (CLASSTYPE_IS_TEMPLATE (name)
2547 || CLASSTYPE_USE_TEMPLATE (name))))
2548 name = TYPE_IDENTIFIER (name);
2550 /* Create a TEMPLATE_ID_EXPR for the type. */
2551 name = build_nt (TEMPLATE_ID_EXPR,
2552 CLASSTYPE_TI_TEMPLATE (name),
2553 CLASSTYPE_TI_ARGS (name));
2555 else if (TREE_CODE (name) == TYPE_DECL)
2556 name = DECL_NAME (name);
2560 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2562 name = TREE_OPERAND (name, 0);
2563 if (TREE_CODE (name) == TEMPLATE_DECL)
2564 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2566 if (TREE_CODE (name) == TEMPLATE_DECL)
2568 error ("%qD used without template parameters", name);
2569 return error_mark_node;
2571 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2572 gcc_assert (TYPE_P (context));
2574 if (!dependent_type_p (context)
2575 || currently_open_class (context))
2577 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2579 tree tmpl = NULL_TREE;
2580 if (IS_AGGR_TYPE (context))
2581 tmpl = lookup_field (context, name, 0, false);
2582 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2584 if (complain & tf_error)
2585 error ("no class template named %q#T in %q#T",
2587 return error_mark_node;
2590 if (complain & tf_error)
2591 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2593 return lookup_template_class (tmpl,
2594 TREE_OPERAND (fullname, 1),
2596 /*entering_scope=*/0,
2597 tf_error | tf_warning | tf_user);
2603 if (!IS_AGGR_TYPE (context))
2605 if (complain & tf_error)
2606 error ("no type named %q#T in %q#T", name, context);
2607 return error_mark_node;
2610 t = lookup_field (context, name, 0, true);
2613 if (TREE_CODE (t) != TYPE_DECL)
2615 if (complain & tf_error)
2616 error ("no type named %q#T in %q#T", name, context);
2617 return error_mark_node;
2620 if (complain & tf_error)
2621 perform_or_defer_access_check (TYPE_BINFO (context), t);
2623 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2631 /* If the CONTEXT is not a template type, then either the field is
2632 there now or its never going to be. */
2633 if (!dependent_type_p (context))
2635 if (complain & tf_error)
2636 error ("no type named %q#T in %q#T", name, context);
2637 return error_mark_node;
2640 return build_typename_type (context, name, fullname, tag_type);
2643 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2644 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2645 in which case error_mark_node is returned.
2647 If PARM_LIST is non-NULL, also make sure that the template parameter
2648 list of TEMPLATE_DECL matches.
2650 If COMPLAIN zero, don't complain about any errors that occur. */
2653 make_unbound_class_template (tree context, tree name, tree parm_list,
2654 tsubst_flags_t complain)
2660 name = TYPE_IDENTIFIER (name);
2661 else if (DECL_P (name))
2662 name = DECL_NAME (name);
2663 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2665 if (!dependent_type_p (context)
2666 || currently_open_class (context))
2668 tree tmpl = NULL_TREE;
2670 if (IS_AGGR_TYPE (context))
2671 tmpl = lookup_field (context, name, 0, false);
2673 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2675 if (complain & tf_error)
2676 error ("no class template named %q#T in %q#T", name, context);
2677 return error_mark_node;
2681 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2683 if (complain & tf_error)
2685 error ("template parameters do not match template");
2686 cp_error_at ("%qD declared here", tmpl);
2688 return error_mark_node;
2691 if (complain & tf_error)
2692 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2697 /* Build the UNBOUND_CLASS_TEMPLATE. */
2698 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2699 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2700 TREE_TYPE (t) = NULL_TREE;
2702 /* Build the corresponding TEMPLATE_DECL. */
2703 d = build_decl (TEMPLATE_DECL, name, t);
2704 TYPE_NAME (TREE_TYPE (d)) = d;
2705 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2706 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2707 DECL_ARTIFICIAL (d) = 1;
2708 DECL_TEMPLATE_PARMS (d) = parm_list;
2715 /* Push the declarations of builtin types into the namespace.
2716 RID_INDEX is the index of the builtin type in the array
2717 RID_POINTERS. NAME is the name used when looking up the builtin
2718 type. TYPE is the _TYPE node for the builtin type. */
2721 record_builtin_type (enum rid rid_index,
2725 tree rname = NULL_TREE, tname = NULL_TREE;
2726 tree tdecl = NULL_TREE;
2728 if ((int) rid_index < (int) RID_MAX)
2729 rname = ridpointers[(int) rid_index];
2731 tname = get_identifier (name);
2733 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2734 eliminated. Built-in types should not be looked up name; their
2735 names are keywords that the parser can recognize. However, there
2736 is code in c-common.c that uses identifier_global_value to look
2737 up built-in types by name. */
2740 tdecl = build_decl (TYPE_DECL, tname, type);
2741 DECL_ARTIFICIAL (tdecl) = 1;
2742 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2748 tdecl = build_decl (TYPE_DECL, rname, type);
2749 DECL_ARTIFICIAL (tdecl) = 1;
2751 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2754 if (!TYPE_NAME (type))
2755 TYPE_NAME (type) = tdecl;
2758 debug_hooks->type_decl (tdecl, 0);
2761 /* Record one of the standard Java types.
2762 * Declare it as having the given NAME.
2763 * If SIZE > 0, it is the size of one of the integral types;
2764 * otherwise it is the negative of the size of one of the other types. */
2767 record_builtin_java_type (const char* name, int size)
2771 type = make_signed_type (size);
2772 else if (size > -32)
2773 { /* "__java_char" or ""__java_boolean". */
2774 type = make_unsigned_type (-size);
2775 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2778 { /* "__java_float" or ""__java_double". */
2779 type = make_node (REAL_TYPE);
2780 TYPE_PRECISION (type) = - size;
2783 record_builtin_type (RID_MAX, name, type);
2784 decl = TYPE_NAME (type);
2786 /* Suppress generate debug symbol entries for these types,
2787 since for normal C++ they are just clutter.
2788 However, push_lang_context undoes this if extern "Java" is seen. */
2789 DECL_IGNORED_P (decl) = 1;
2791 TYPE_FOR_JAVA (type) = 1;
2795 /* Push a type into the namespace so that the back-ends ignore it. */
2798 record_unknown_type (tree type, const char* name)
2800 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2801 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2802 DECL_IGNORED_P (decl) = 1;
2803 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2804 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2805 TYPE_ALIGN (type) = 1;
2806 TYPE_USER_ALIGN (type) = 0;
2807 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2810 /* An string for which we should create an IDENTIFIER_NODE at
2813 typedef struct predefined_identifier
2815 /* The name of the identifier. */
2816 const char *const name;
2817 /* The place where the IDENTIFIER_NODE should be stored. */
2819 /* Nonzero if this is the name of a constructor or destructor. */
2820 const int ctor_or_dtor_p;
2821 } predefined_identifier;
2823 /* Create all the predefined identifiers. */
2826 initialize_predefined_identifiers (void)
2828 const predefined_identifier *pid;
2830 /* A table of identifiers to create at startup. */
2831 static const predefined_identifier predefined_identifiers[] = {
2832 { "C++", &lang_name_cplusplus, 0 },
2833 { "C", &lang_name_c, 0 },
2834 { "Java", &lang_name_java, 0 },
2835 /* Some of these names have a trailing space so that it is
2836 impossible for them to conflict with names written by users. */
2837 { "__ct ", &ctor_identifier, 1 },
2838 { "__base_ctor ", &base_ctor_identifier, 1 },
2839 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2840 { "__dt ", &dtor_identifier, 1 },
2841 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2842 { "__base_dtor ", &base_dtor_identifier, 1 },
2843 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2844 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2845 { "nelts", &nelts_identifier, 0 },
2846 { THIS_NAME, &this_identifier, 0 },
2847 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2848 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2849 { "_vptr", &vptr_identifier, 0 },
2850 { "__vtt_parm", &vtt_parm_identifier, 0 },
2851 { "::", &global_scope_name, 0 },
2852 { "std", &std_identifier, 0 },
2856 for (pid = predefined_identifiers; pid->name; ++pid)
2858 *pid->node = get_identifier (pid->name);
2859 if (pid->ctor_or_dtor_p)
2860 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2864 /* Create the predefined scalar types of C,
2865 and some nodes representing standard constants (0, 1, (void *)0).
2866 Initialize the global binding level.
2867 Make definitions for built-in primitive functions. */
2870 cxx_init_decl_processing (void)
2873 tree void_ftype_ptr;
2875 build_common_tree_nodes (flag_signed_char, false);
2877 /* Create all the identifiers we need. */
2878 initialize_predefined_identifiers ();
2880 /* Create the global variables. */
2881 push_to_top_level ();
2883 current_function_decl = NULL_TREE;
2884 current_binding_level = NULL;
2885 /* Enter the global namespace. */
2886 gcc_assert (global_namespace == NULL_TREE);
2887 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2889 begin_scope (sk_namespace, global_namespace);
2891 current_lang_name = NULL_TREE;
2893 /* Adjust various flags based on command-line settings. */
2894 if (!flag_permissive)
2895 flag_pedantic_errors = 1;
2896 if (!flag_no_inline)
2898 flag_inline_trees = 1;
2901 if (flag_inline_functions)
2902 flag_inline_trees = 2;
2904 /* Force minimum function alignment if using the least significant
2905 bit of function pointers to store the virtual bit. */
2906 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2907 && force_align_functions_log < 1)
2908 force_align_functions_log = 1;
2911 current_lang_name = lang_name_c;
2913 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2914 TREE_TYPE (error_mark_list) = error_mark_node;
2916 /* Create the `std' namespace. */
2917 push_namespace (std_identifier);
2918 std_node = current_namespace;
2921 c_common_nodes_and_builtins ();
2923 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
2924 java_short_type_node = record_builtin_java_type ("__java_short", 16);
2925 java_int_type_node = record_builtin_java_type ("__java_int", 32);
2926 java_long_type_node = record_builtin_java_type ("__java_long", 64);
2927 java_float_type_node = record_builtin_java_type ("__java_float", -32);
2928 java_double_type_node = record_builtin_java_type ("__java_double", -64);
2929 java_char_type_node = record_builtin_java_type ("__java_char", -16);
2930 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
2932 integer_two_node = build_int_cst (NULL_TREE, 2);
2933 integer_three_node = build_int_cst (NULL_TREE, 3);
2935 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
2936 truthvalue_type_node = boolean_type_node;
2937 truthvalue_false_node = boolean_false_node;
2938 truthvalue_true_node = boolean_true_node;
2940 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
2943 record_builtin_type (RID_MAX, NULL, string_type_node);
2946 delta_type_node = ptrdiff_type_node;
2947 vtable_index_type = ptrdiff_type_node;
2949 vtt_parm_type = build_pointer_type (const_ptr_type_node);
2950 void_ftype = build_function_type (void_type_node, void_list_node);
2951 void_ftype_ptr = build_function_type (void_type_node,
2952 tree_cons (NULL_TREE,
2956 = build_exception_variant (void_ftype_ptr, empty_except_spec);
2958 /* C++ extensions */
2960 unknown_type_node = make_node (UNKNOWN_TYPE);
2961 record_unknown_type (unknown_type_node, "unknown type");
2963 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
2964 TREE_TYPE (unknown_type_node) = unknown_type_node;
2966 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
2968 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
2969 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
2972 /* Make sure we get a unique function type, so we can give
2973 its pointer type a name. (This wins for gdb.) */
2974 tree vfunc_type = make_node (FUNCTION_TYPE);
2975 TREE_TYPE (vfunc_type) = integer_type_node;
2976 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
2977 layout_type (vfunc_type);
2979 vtable_entry_type = build_pointer_type (vfunc_type);
2981 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
2984 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
2985 layout_type (vtbl_type_node);
2986 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
2987 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
2988 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
2989 layout_type (vtbl_ptr_type_node);
2990 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
2992 push_namespace (get_identifier ("__cxxabiv1"));
2993 abi_node = current_namespace;
2996 global_type_node = make_node (LANG_TYPE);
2997 record_unknown_type (global_type_node, "global type");
3000 current_lang_name = lang_name_cplusplus;
3004 tree bad_alloc_type_node;
3005 tree bad_alloc_decl;
3006 tree newtype, deltype;
3007 tree ptr_ftype_sizetype;
3009 push_namespace (std_identifier);
3010 bad_alloc_id = get_identifier ("bad_alloc");
3011 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3012 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3014 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3015 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3016 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3020 = build_function_type (ptr_type_node,
3021 tree_cons (NULL_TREE,
3024 newtype = build_exception_variant
3025 (ptr_ftype_sizetype, add_exception_specifier
3026 (NULL_TREE, bad_alloc_type_node, -1));
3027 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3028 push_cp_library_fn (NEW_EXPR, newtype);
3029 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3030 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3031 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3035 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3037 /* Perform other language dependent initializations. */
3038 init_class_processing ();
3039 init_rtti_processing ();
3041 if (flag_exceptions)
3042 init_exception_processing ();
3044 if (! supports_one_only ())
3047 make_fname_decl = cp_make_fname_decl;
3048 start_fname_decls ();
3050 /* Show we use EH for cleanups. */
3051 if (flag_exceptions)
3052 using_eh_for_cleanups ();
3055 /* Generate an initializer for a function naming variable from
3056 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3057 filled in with the type of the init. */
3060 cp_fname_init (const char* name, tree *type_p)
3062 tree domain = NULL_TREE;
3064 tree init = NULL_TREE;
3069 length = strlen (name);
3070 domain = build_index_type (size_int (length));
3071 init = build_string (length + 1, name);
3074 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3075 type = build_cplus_array_type (type, domain);
3080 TREE_TYPE (init) = type;
3082 init = error_mark_node;
3087 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3088 decl, NAME is the initialization string and TYPE_DEP indicates whether
3089 NAME depended on the type of the function. We make use of that to detect
3090 __PRETTY_FUNCTION__ inside a template fn. This is being done
3091 lazily at the point of first use, so we mustn't push the decl now. */
3094 cp_make_fname_decl (tree id, int type_dep)
3096 const char *const name = (type_dep && processing_template_decl
3097 ? NULL : fname_as_string (type_dep));
3099 tree init = cp_fname_init (name, &type);
3100 tree decl = build_decl (VAR_DECL, id, type);
3103 free ((char *) name);
3105 /* As we're using pushdecl_with_scope, we must set the context. */
3106 DECL_CONTEXT (decl) = current_function_decl;
3107 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3109 TREE_STATIC (decl) = 1;
3110 TREE_READONLY (decl) = 1;
3111 DECL_ARTIFICIAL (decl) = 1;
3112 DECL_INITIAL (decl) = init;
3114 TREE_USED (decl) = 1;
3116 if (current_function_decl)
3118 struct cp_binding_level *b = current_binding_level;
3119 while (b->level_chain->kind != sk_function_parms)
3121 pushdecl_with_scope (decl, b);
3122 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3125 pushdecl_top_level_and_finish (decl, init);
3130 /* Make a definition for a builtin function named NAME in the current
3131 namespace, whose data type is TYPE and whose context is CONTEXT.
3132 TYPE should be a function type with argument types.
3134 CLASS and CODE tell later passes how to compile calls to this function.
3135 See tree.h for possible values.
3137 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3138 the name to be called if we can't opencode the function.
3139 If ATTRS is nonzero, use that for the function's attribute
3143 builtin_function_1 (const char* name,
3146 enum built_in_function code,
3147 enum built_in_class class,
3148 const char* libname,
3151 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3152 DECL_BUILT_IN_CLASS (decl) = class;
3153 DECL_FUNCTION_CODE (decl) = code;
3154 DECL_CONTEXT (decl) = context;
3158 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3159 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3160 function in the namespace. */
3162 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3164 /* Warn if a function in the namespace for users
3165 is used without an occasion to consider it declared. */
3166 if (name[0] != '_' || name[1] != '_')
3167 DECL_ANTICIPATED (decl) = 1;
3169 /* Possibly apply some default attributes to this built-in function. */
3171 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3173 decl_attributes (&decl, NULL_TREE, 0);
3178 /* Entry point for the benefit of c_common_nodes_and_builtins.
3180 Make a definition for a builtin function named NAME and whose data type
3181 is TYPE. TYPE should be a function type with argument types. This
3182 function places the anticipated declaration in the global namespace
3183 and additionally in the std namespace if appropriate.
3185 CLASS and CODE tell later passes how to compile calls to this function.
3186 See tree.h for possible values.
3188 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3189 the name to be called if we can't opencode the function.
3191 If ATTRS is nonzero, use that for the function's attribute
3195 builtin_function (const char* name,
3198 enum built_in_class cl,
3199 const char* libname,
3202 /* All builtins that don't begin with an '_' should additionally
3203 go in the 'std' namespace. */
3206 push_namespace (std_identifier);
3207 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3211 return builtin_function_1 (name, type, NULL_TREE, code,
3212 cl, libname, attrs);
3215 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3216 function. Not called directly. */
3219 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3221 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3222 DECL_EXTERNAL (fn) = 1;
3223 TREE_PUBLIC (fn) = 1;
3224 DECL_ARTIFICIAL (fn) = 1;
3225 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3226 SET_DECL_LANGUAGE (fn, lang_c);
3227 /* Runtime library routines are, by definition, available in an
3228 external shared object. */
3229 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3230 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3234 /* Returns the _DECL for a library function with C linkage.
3235 We assume that such functions never throw; if this is incorrect,
3236 callers should unset TREE_NOTHROW. */
3239 build_library_fn (tree name, tree type)
3241 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3242 TREE_NOTHROW (fn) = 1;
3246 /* Returns the _DECL for a library function with C++ linkage. */
3249 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3251 tree fn = build_library_fn_1 (name, operator_code, type);
3252 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3253 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3254 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3258 /* Like build_library_fn, but takes a C string instead of an
3262 build_library_fn_ptr (const char* name, tree type)
3264 return build_library_fn (get_identifier (name), type);
3267 /* Like build_cp_library_fn, but takes a C string instead of an
3271 build_cp_library_fn_ptr (const char* name, tree type)
3273 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3276 /* Like build_library_fn, but also pushes the function so that we will
3277 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3280 push_library_fn (tree name, tree type)
3282 tree fn = build_library_fn (name, type);
3283 pushdecl_top_level (fn);
3287 /* Like build_cp_library_fn, but also pushes the function so that it
3288 will be found by normal lookup. */
3291 push_cp_library_fn (enum tree_code operator_code, tree type)
3293 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3300 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3304 push_void_library_fn (tree name, tree parmtypes)
3306 tree type = build_function_type (void_type_node, parmtypes);
3307 return push_library_fn (name, type);
3310 /* Like push_library_fn, but also note that this function throws
3311 and does not return. Used for __throw_foo and the like. */
3314 push_throw_library_fn (tree name, tree type)
3316 tree fn = push_library_fn (name, type);
3317 TREE_THIS_VOLATILE (fn) = 1;
3318 TREE_NOTHROW (fn) = 0;
3322 /* When we call finish_struct for an anonymous union, we create
3323 default copy constructors and such. But, an anonymous union
3324 shouldn't have such things; this function undoes the damage to the
3325 anonymous union type T.
3327 (The reason that we create the synthesized methods is that we don't
3328 distinguish `union { int i; }' from `typedef union { int i; } U'.
3329 The first is an anonymous union; the second is just an ordinary
3333 fixup_anonymous_aggr (tree t)
3337 /* Wipe out memory of synthesized methods. */
3338 TYPE_HAS_CONSTRUCTOR (t) = 0;
3339 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3340 TYPE_HAS_INIT_REF (t) = 0;
3341 TYPE_HAS_CONST_INIT_REF (t) = 0;
3342 TYPE_HAS_ASSIGN_REF (t) = 0;
3343 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3345 /* Splice the implicitly generated functions out of the TYPE_METHODS
3347 q = &TYPE_METHODS (t);
3350 if (DECL_ARTIFICIAL (*q))
3351 *q = TREE_CHAIN (*q);
3353 q = &TREE_CHAIN (*q);
3356 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3357 if (TYPE_METHODS (t))
3358 error ("%Jan anonymous union cannot have function members",
3359 TYPE_MAIN_DECL (t));
3361 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3362 assignment operators (because they cannot have these methods themselves).
3363 For anonymous unions this is already checked because they are not allowed
3364 in any union, otherwise we have to check it. */
3365 if (TREE_CODE (t) != UNION_TYPE)
3369 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3370 if (TREE_CODE (field) == FIELD_DECL)
3372 type = TREE_TYPE (field);
3373 if (CLASS_TYPE_P (type))
3375 if (TYPE_NEEDS_CONSTRUCTING (type))
3376 cp_error_at ("member %q#D with constructor not allowed "
3377 "in anonymous aggregate",
3379 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3380 cp_error_at ("member %q#D with destructor not allowed "
3381 "in anonymous aggregate",
3383 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3384 cp_error_at ("member %q#D with copy assignment operator "
3385 "not allowed in anonymous aggregate",
3392 /* Make sure that a declaration with no declarator is well-formed, i.e.
3393 just declares a tagged type or anonymous union.
3395 Returns the type declared; or NULL_TREE if none. */
3398 check_tag_decl (cp_decl_specifier_seq *declspecs)
3400 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3401 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3402 /* If a class, struct, or enum type is declared by the DECLSPECS
3403 (i.e, if a class-specifier, enum-specifier, or non-typename
3404 elaborated-type-specifier appears in the DECLSPECS),
3405 DECLARED_TYPE is set to the corresponding type. */
3406 tree declared_type = NULL_TREE;
3407 bool error_p = false;
3409 if (declspecs->multiple_types_p)
3410 error ("multiple types in one declaration");
3411 else if (declspecs->redefined_builtin_type)
3413 if (!in_system_header)
3414 pedwarn ("redeclaration of C++ built-in type %qT",
3415 declspecs->redefined_builtin_type);
3420 && TYPE_P (declspecs->type)
3421 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3422 && IS_AGGR_TYPE (declspecs->type))
3423 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3424 declared_type = declspecs->type;
3425 else if (declspecs->type == error_mark_node)
3427 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3428 pedwarn ("declaration does not declare anything");
3429 /* Check for an anonymous union. */
3430 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3431 && TYPE_ANONYMOUS_P (declared_type))
3433 /* 7/3 In a simple-declaration, the optional init-declarator-list
3434 can be omitted only when declaring a class (clause 9) or
3435 enumeration (7.2), that is, when the decl-specifier-seq contains
3436 either a class-specifier, an elaborated-type-specifier with
3437 a class-key (9.1), or an enum-specifier. In these cases and
3438 whenever a class-specifier or enum-specifier is present in the
3439 decl-specifier-seq, the identifiers in these specifiers are among
3440 the names being declared by the declaration (as class-name,
3441 enum-names, or enumerators, depending on the syntax). In such
3442 cases, and except for the declaration of an unnamed bit-field (9.6),
3443 the decl-specifier-seq shall introduce one or more names into the
3444 program, or shall redeclare a name introduced by a previous
3445 declaration. [Example:
3446 enum { }; // ill-formed
3447 typedef class { }; // ill-formed
3451 error ("missing type-name in typedef-declaration");
3454 /* Anonymous unions are objects, so they can have specifiers. */;
3455 SET_ANON_AGGR_TYPE_P (declared_type);
3457 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3458 && !in_system_header)
3459 pedwarn ("ISO C++ prohibits anonymous structs");
3464 if (declspecs->specs[(int)ds_inline]
3465 || declspecs->specs[(int)ds_virtual])
3466 error ("%qs can only be specified for functions",
3467 declspecs->specs[(int)ds_inline]
3468 ? "inline" : "virtual");
3470 && (!current_class_type
3471 || current_scope () != current_class_type))
3472 error ("%<friend%> can only be specified inside a class");
3473 else if (declspecs->specs[(int)ds_explicit])
3474 error ("%<explicit%> can only be specified for constructors");
3475 else if (declspecs->storage_class)
3476 error ("a storage class can only be specified for objects "
3478 else if (declspecs->specs[(int)ds_const]
3479 || declspecs->specs[(int)ds_volatile]
3480 || declspecs->specs[(int)ds_restrict]
3481 || declspecs->specs[(int)ds_thread])
3482 error ("qualifiers can only be specified for objects "
3486 return declared_type;
3489 /* Called when a declaration is seen that contains no names to declare.
3490 If its type is a reference to a structure, union or enum inherited
3491 from a containing scope, shadow that tag name for the current scope
3492 with a forward reference.
3493 If its type defines a new named structure or union
3494 or defines an enum, it is valid but we need not do anything here.
3495 Otherwise, it is an error.
3497 C++: may have to grok the declspecs to learn about static,
3498 complain for anonymous unions.
3500 Returns the TYPE declared -- or NULL_TREE if none. */
3503 shadow_tag (cp_decl_specifier_seq *declspecs)
3505 tree t = check_tag_decl (declspecs);
3510 if (declspecs->attributes)
3512 cp_warning_at ("attribute ignored in declaration of %q#T", t);
3513 cp_warning_at ("attribute for %q#T must follow the %qs keyword",
3515 class_key_or_enum_as_string (t));
3519 maybe_process_partial_specialization (t);
3521 /* This is where the variables in an anonymous union are
3522 declared. An anonymous union declaration looks like:
3524 because there is no declarator after the union, the parser
3525 sends that declaration here. */
3526 if (ANON_AGGR_TYPE_P (t))
3528 fixup_anonymous_aggr (t);
3530 if (TYPE_FIELDS (t))
3532 tree decl = grokdeclarator (/*declarator=*/NULL,
3533 declspecs, NORMAL, 0, NULL);
3534 finish_anon_union (decl);
3541 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3544 groktypename (cp_decl_specifier_seq *type_specifiers,
3545 const cp_declarator *declarator)
3549 attrs = type_specifiers->attributes;
3550 type_specifiers->attributes = NULL_TREE;
3551 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3553 cplus_decl_attributes (&type, attrs, 0);
3557 /* Decode a declarator in an ordinary declaration or data definition.
3558 This is called as soon as the type information and variable name
3559 have been parsed, before parsing the initializer if any.
3560 Here we create the ..._DECL node, fill in its type,
3561 and put it on the list of decls for the current context.
3562 The ..._DECL node is returned as the value.
3564 Exception: for arrays where the length is not specified,
3565 the type is left null, to be filled in by `cp_finish_decl'.
3567 Function definitions do not come here; they go to start_function
3568 instead. However, external and forward declarations of functions
3569 do go through here. Structure field declarations are done by
3570 grokfield and not through here. */
3573 start_decl (const cp_declarator *declarator,
3574 cp_decl_specifier_seq *declspecs,
3577 tree prefix_attributes,
3578 tree *pushed_scope_p)
3584 *pushed_scope_p = NULL_TREE;
3586 /* This should only be done once on the top most decl. */
3587 if (have_extern_spec)
3589 declspecs->storage_class = sc_extern;
3590 have_extern_spec = false;
3593 /* An object declared as __attribute__((deprecated)) suppresses
3594 warnings of uses of other deprecated items. */
3595 if (lookup_attribute ("deprecated", attributes))
3596 deprecated_state = DEPRECATED_SUPPRESS;
3598 attributes = chainon (attributes, prefix_attributes);
3600 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3603 deprecated_state = DEPRECATED_NORMAL;
3605 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE)
3606 return error_mark_node;
3608 type = TREE_TYPE (decl);
3610 if (type == error_mark_node)
3611 return error_mark_node;
3613 context = DECL_CONTEXT (decl);
3617 *pushed_scope_p = push_scope (context);
3619 /* We are only interested in class contexts, later. */
3620 if (TREE_CODE (context) == NAMESPACE_DECL)
3621 context = NULL_TREE;
3625 /* Is it valid for this decl to have an initializer at all?
3626 If not, set INITIALIZED to zero, which will indirectly
3627 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3628 switch (TREE_CODE (decl))
3631 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3636 error ("function %q#D is initialized like a variable", decl);
3646 if (! toplevel_bindings_p ()
3647 && DECL_EXTERNAL (decl))
3648 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3650 DECL_EXTERNAL (decl) = 0;
3651 if (toplevel_bindings_p ())
3652 TREE_STATIC (decl) = 1;
3654 /* Tell `pushdecl' this is an initialized decl
3655 even though we don't yet have the initializer expression.
3656 Also tell `cp_finish_decl' it may store the real initializer. */
3657 DECL_INITIAL (decl) = error_mark_node;
3660 /* Set attributes here so if duplicate decl, will have proper attributes. */
3661 cplus_decl_attributes (&decl, attributes, 0);
3663 /* If #pragma weak was used, mark the decl weak now. */
3664 maybe_apply_pragma_weak (decl);
3666 if (TREE_CODE (decl) == FUNCTION_DECL
3667 && DECL_DECLARED_INLINE_P (decl)
3668 && DECL_UNINLINABLE (decl)
3669 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3670 warning (0, "%Jinline function %qD given attribute noinline", decl, decl);
3672 if (context && COMPLETE_TYPE_P (complete_type (context)))
3674 if (TREE_CODE (decl) == VAR_DECL)
3676 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3677 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3678 error ("%q#D is not a static member of %q#T", decl, context);
3681 if (DECL_CONTEXT (field) != context)
3683 if (!same_type_p (DECL_CONTEXT (field), context))
3684 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3685 "to be defined as %<%T::%D%>",
3686 DECL_CONTEXT (field), DECL_NAME (decl),
3687 context, DECL_NAME (decl));
3688 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3690 if (processing_specialization
3691 && template_class_depth (context) == 0
3692 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3693 error ("template header not allowed in member definition "
3694 "of explicitly specialized class");
3695 /* Static data member are tricky; an in-class initialization
3696 still doesn't provide a definition, so the in-class
3697 declaration will have DECL_EXTERNAL set, but will have an
3698 initialization. Thus, duplicate_decls won't warn
3699 about this situation, and so we check here. */
3700 if (DECL_INITIAL (decl) && DECL_INITIAL (field))
3701 error ("duplicate initialization of %qD", decl);
3702 if (duplicate_decls (decl, field))
3708 tree field = check_classfn (context, decl,
3709 (processing_template_decl
3710 > template_class_depth (context))
3711 ? current_template_parms
3713 if (field && duplicate_decls (decl, field))
3717 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3718 DECL_IN_AGGR_P (decl) = 0;
3719 /* Do not mark DECL as an explicit specialization if it was not
3720 already marked as an instantiation; a declaration should
3721 never be marked as a specialization unless we know what
3722 template is being specialized. */
3723 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3725 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3727 /* [temp.expl.spec] An explicit specialization of a static data
3728 member of a template is a definition if the declaration
3729 includes an initializer; otherwise, it is a declaration.
3731 We check for processing_specialization so this only applies
3732 to the new specialization syntax. */
3733 if (!DECL_INITIAL (decl)
3734 && processing_specialization)
3735 DECL_EXTERNAL (decl) = 1;
3738 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3739 pedwarn ("declaration of %q#D outside of class is not definition",
3743 /* Enter this declaration into the symbol table. */
3744 tem = maybe_push_decl (decl);
3746 if (processing_template_decl)
3747 tem = push_template_decl (tem);
3748 if (tem == error_mark_node)
3749 return error_mark_node;
3751 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3752 /* Tell the back-end to use or not use .common as appropriate. If we say
3753 -fconserve-space, we want this to save .data space, at the expense of
3754 wrong semantics. If we say -fno-conserve-space, we want this to
3755 produce errors about redefs; to do this we force variables into the
3757 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3758 || !DECL_THREAD_LOCAL (tem))
3759 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3762 if (! processing_template_decl)
3769 start_decl_1 (tree decl)
3771 tree type = TREE_TYPE (decl);
3772 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3774 if (type == error_mark_node)
3778 /* Is it valid for this decl to have an initializer at all?
3779 If not, set INITIALIZED to zero, which will indirectly
3780 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3782 /* Don't allow initializations for incomplete types except for
3783 arrays which might be completed by the initialization. */
3784 if (COMPLETE_TYPE_P (complete_type (type)))
3785 ; /* A complete type is ok. */
3786 else if (TREE_CODE (type) != ARRAY_TYPE)
3788 error ("variable %q#D has initializer but incomplete type", decl);
3790 type = TREE_TYPE (decl) = error_mark_node;
3792 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3794 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3795 error ("elements of array %q#D have incomplete type", decl);
3796 /* else we already gave an error in start_decl. */
3802 && TREE_CODE (decl) != TYPE_DECL
3803 && TREE_CODE (decl) != TEMPLATE_DECL
3804 && type != error_mark_node
3805 && IS_AGGR_TYPE (type)
3806 && ! DECL_EXTERNAL (decl))
3808 if ((! processing_template_decl || ! uses_template_parms (type))
3809 && !COMPLETE_TYPE_P (complete_type (type)))
3811 error ("aggregate %q#D has incomplete type and cannot be defined",
3813 /* Change the type so that assemble_variable will give
3814 DECL an rtl we can live with: (mem (const_int 0)). */
3815 type = TREE_TYPE (decl) = error_mark_node;
3819 /* If any base type in the hierarchy of TYPE needs a constructor,
3820 then we set initialized to 1. This way any nodes which are
3821 created for the purposes of initializing this aggregate
3822 will live as long as it does. This is necessary for global
3823 aggregates which do not have their initializers processed until
3824 the end of the file. */
3825 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3830 DECL_INITIAL (decl) = NULL_TREE;
3832 /* Create a new scope to hold this declaration if necessary.
3833 Whether or not a new scope is necessary cannot be determined
3834 until after the type has been completed; if the type is a
3835 specialization of a class template it is not until after
3836 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3837 will be set correctly. */
3838 maybe_push_cleanup_level (type);
3841 /* Handle initialization of references. DECL, TYPE, and INIT have the
3842 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3843 but will be set to a new CLEANUP_STMT if a temporary is created
3844 that must be destroyed subsequently.
3846 Returns an initializer expression to use to initialize DECL, or
3847 NULL if the initialization can be performed statically.
3849 Quotes on semantics can be found in ARM 8.4.3. */
3852 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3856 if (init == NULL_TREE)
3858 if ((DECL_LANG_SPECIFIC (decl) == 0
3859 || DECL_IN_AGGR_P (decl) == 0)
3860 && ! DECL_THIS_EXTERN (decl))
3861 error ("%qD declared as reference but not initialized", decl);
3865 if (TREE_CODE (init) == CONSTRUCTOR)
3867 error ("ISO C++ forbids use of initializer list to "
3868 "initialize reference %qD", decl);
3872 if (TREE_CODE (init) == TREE_LIST)
3873 init = build_x_compound_expr_from_list (init, "initializer");
3875 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3876 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3877 /* Note: default conversion is only called in very special cases. */
3878 init = decay_conversion (init);
3880 /* Convert INIT to the reference type TYPE. This may involve the
3881 creation of a temporary, whose lifetime must be the same as that
3882 of the reference. If so, a DECL_EXPR for the temporary will be
3883 added just after the DECL_EXPR for DECL. That's why we don't set
3884 DECL_INITIAL for local references (instead assigning to them
3885 explicitly); we need to allow the temporary to be initialized
3887 tmp = initialize_reference (type, init, decl, cleanup);
3889 if (tmp == error_mark_node)
3891 else if (tmp == NULL_TREE)
3893 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3897 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3900 DECL_INITIAL (decl) = tmp;
3905 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3906 array until we finish parsing the initializer. If that's the
3907 situation we're in, update DECL accordingly. */
3910 maybe_deduce_size_from_array_init (tree decl, tree init)
3912 tree type = TREE_TYPE (decl);
3914 if (TREE_CODE (type) == ARRAY_TYPE
3915 && TYPE_DOMAIN (type) == NULL_TREE
3916 && TREE_CODE (decl) != TYPE_DECL)
3918 /* do_default is really a C-ism to deal with tentative definitions.
3919 But let's leave it here to ease the eventual merge. */
3920 int do_default = !DECL_EXTERNAL (decl);
3921 tree initializer = init ? init : DECL_INITIAL (decl);
3922 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
3926 error ("initializer fails to determine size of %qD", decl);
3931 error ("array size missing in %qD", decl);
3932 /* If a `static' var's size isn't known, make it extern as
3933 well as static, so it does not get allocated. If it's not
3934 `static', then don't mark it extern; finish_incomplete_decl
3935 will give it a default size and it will get allocated. */
3936 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3937 DECL_EXTERNAL (decl) = 1;
3941 error ("zero-size array %qD", decl);
3943 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
3945 layout_decl (decl, 0);
3949 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
3950 any appropriate error messages regarding the layout. */
3953 layout_var_decl (tree decl)
3955 tree type = TREE_TYPE (decl);
3957 /* If we haven't already layed out this declaration, do so now.
3958 Note that we must not call complete type for an external object
3959 because it's type might involve templates that we are not
3960 supposed to instantiate yet. (And it's perfectly valid to say
3961 `extern X x' for some incomplete type `X'.) */
3962 if (!DECL_EXTERNAL (decl))
3963 complete_type (type);
3964 if (!DECL_SIZE (decl)
3965 && TREE_TYPE (decl) != error_mark_node
3966 && (COMPLETE_TYPE_P (type)
3967 || (TREE_CODE (type) == ARRAY_TYPE
3968 && !TYPE_DOMAIN (type)
3969 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
3970 layout_decl (decl, 0);
3972 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
3974 /* An automatic variable with an incomplete type: that is an error.
3975 Don't talk about array types here, since we took care of that
3976 message in grokdeclarator. */
3977 error ("storage size of %qD isn't known", decl);
3978 TREE_TYPE (decl) = error_mark_node;
3981 /* Keep this code around in case we later want to control debug info
3982 based on whether a type is "used". (jason 1999-11-11) */
3984 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
3985 /* Let debugger know it should output info for this type. */
3986 note_debug_info_needed (ttype);
3988 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
3989 note_debug_info_needed (DECL_CONTEXT (decl));
3992 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3993 && DECL_SIZE (decl) != NULL_TREE
3994 && ! TREE_CONSTANT (DECL_SIZE (decl)))
3996 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3997 constant_expression_warning (DECL_SIZE (decl));
3999 error ("storage size of %qD isn't constant", decl);
4002 if (TREE_STATIC (decl)
4003 && !DECL_ARTIFICIAL (decl)
4004 && current_function_decl
4005 && DECL_CONTEXT (decl) == current_function_decl)
4006 push_local_name (decl);
4009 /* If a local static variable is declared in an inline function, or if
4010 we have a weak definition, we must endeavor to create only one
4011 instance of the variable at link-time. */
4014 maybe_commonize_var (tree decl)
4016 /* Static data in a function with comdat linkage also has comdat
4018 if (TREE_STATIC (decl)
4019 /* Don't mess with __FUNCTION__. */
4020 && ! DECL_ARTIFICIAL (decl)
4021 && DECL_FUNCTION_SCOPE_P (decl)
4022 /* Unfortunately, import_export_decl has not always been called
4023 before the function is processed, so we cannot simply check
4025 && (DECL_COMDAT (DECL_CONTEXT (decl))
4026 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4027 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4028 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4032 /* With weak symbols, we simply make the variable COMDAT;
4033 that will cause copies in multiple translations units to
4035 comdat_linkage (decl);
4039 if (DECL_INITIAL (decl) == NULL_TREE
4040 || DECL_INITIAL (decl) == error_mark_node)
4042 /* Without weak symbols, we can use COMMON to merge
4043 uninitialized variables. */
4044 TREE_PUBLIC (decl) = 1;
4045 DECL_COMMON (decl) = 1;
4049 /* While for initialized variables, we must use internal
4050 linkage -- which means that multiple copies will not
4052 TREE_PUBLIC (decl) = 0;
4053 DECL_COMMON (decl) = 0;
4054 cp_warning_at ("sorry: semantics of inline function static "
4055 "data %q#D are wrong (you'll wind up "
4056 "with multiple copies)", decl);
4057 warning (0, "%J you can work around this by removing "
4063 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4064 /* Set it up again; we might have set DECL_INITIAL since the last
4066 comdat_linkage (decl);
4069 /* Issue an error message if DECL is an uninitialized const variable. */
4072 check_for_uninitialized_const_var (tree decl)
4074 tree type = TREE_TYPE (decl);
4076 /* ``Unless explicitly declared extern, a const object does not have
4077 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4079 if (TREE_CODE (decl) == VAR_DECL
4080 && TREE_CODE (type) != REFERENCE_TYPE
4081 && CP_TYPE_CONST_P (type)
4082 && !TYPE_NEEDS_CONSTRUCTING (type)
4083 && !DECL_INITIAL (decl))
4084 error ("uninitialized const %qD", decl);
4087 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4088 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4089 initialized. If there are no more such fields, the return value
4093 next_initializable_field (tree field)
4096 && (TREE_CODE (field) != FIELD_DECL
4097 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4098 || DECL_ARTIFICIAL (field)))
4099 field = TREE_CHAIN (field);
4104 /* Subroutine of reshape_init. Reshape the constructor for an array. INITP
4105 is the pointer to the old constructor list (to the CONSTRUCTOR_ELTS of
4106 the CONSTRUCTOR we are processing), while NEW_INIT is the CONSTRUCTOR we
4108 ELT_TYPE is the element type of the array. MAX_INDEX is an INTEGER_CST
4109 representing the size of the array minus one (the maximum index), or
4110 NULL_TREE if the array was declared without specifying the size. */
4113 reshape_init_array (tree elt_type, tree max_index,
4114 tree *initp, tree new_init)
4116 bool sized_array_p = (max_index != NULL_TREE);
4117 unsigned HOST_WIDE_INT max_index_cst = 0;
4118 unsigned HOST_WIDE_INT index;
4122 if (host_integerp (max_index, 1))
4123 max_index_cst = tree_low_cst (max_index, 1);
4124 /* sizetype is sign extended, not zero extended. */
4126 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4130 /* Loop until there are no more initializers. */
4132 *initp && (!sized_array_p || index <= max_index_cst);
4136 tree designated_index;
4138 element_init = reshape_init (elt_type, initp);
4139 if (element_init == error_mark_node)
4141 TREE_CHAIN (element_init) = CONSTRUCTOR_ELTS (new_init);
4142 CONSTRUCTOR_ELTS (new_init) = element_init;
4143 designated_index = TREE_PURPOSE (element_init);
4144 if (designated_index)
4146 /* Handle array designated initializers (GNU extension). */
4147 if (TREE_CODE (designated_index) == IDENTIFIER_NODE)
4149 error ("name %qD used in a GNU-style designated "
4150 "initializer for an array", designated_index);
4151 TREE_PURPOSE (element_init) = NULL_TREE;
4161 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4162 brace-enclosed aggregate initializer.
4164 *INITP is one of a list of initializers describing a brace-enclosed
4165 initializer for an entity of the indicated aggregate TYPE. It may
4166 not presently match the shape of the TYPE; for example:
4168 struct S { int a; int b; };
4169 struct S a[] = { 1, 2, 3, 4 };
4171 Here *INITP will point to TREE_LIST of four elements, rather than a
4172 list of two elements, each itself a list of two elements. This
4173 routine transforms INIT from the former form into the latter. The
4174 revised initializer is returned. */
4177 reshape_init (tree type, tree *initp)
4181 tree old_init_value;
4183 bool brace_enclosed_p;
4187 old_init_value = (TREE_CODE (*initp) == TREE_LIST
4188 ? TREE_VALUE (*initp) : old_init);
4190 gcc_assert (old_init_value);
4192 /* If the initializer is brace-enclosed, pull initializers from the
4193 enclosed elements. Advance past the brace-enclosed initializer
4195 if (TREE_CODE (old_init_value) == CONSTRUCTOR
4196 && BRACE_ENCLOSED_INITIALIZER_P (old_init_value))
4198 *initp = TREE_CHAIN (old_init);
4199 TREE_CHAIN (old_init) = NULL_TREE;
4200 inits = CONSTRUCTOR_ELTS (old_init_value);
4202 brace_enclosed_p = true;
4207 brace_enclosed_p = false;
4210 /* A non-aggregate type is always initialized with a single
4212 if (!CP_AGGREGATE_TYPE_P (type))
4214 *initp = TREE_CHAIN (old_init);
4215 TREE_CHAIN (old_init) = NULL_TREE;
4216 /* It is invalid to initialize a non-aggregate type with a
4217 brace-enclosed initializer. */
4218 if (brace_enclosed_p)
4220 error ("brace-enclosed initializer used to initialize %qT",
4222 if (TREE_CODE (old_init) == TREE_LIST)
4223 TREE_VALUE (old_init) = error_mark_node;
4225 old_init = error_mark_node;
4233 All implicit type conversions (clause _conv_) are considered when
4234 initializing the aggregate member with an initializer from an
4235 initializer-list. If the initializer can initialize a member,
4236 the member is initialized. Otherwise, if the member is itself a
4237 non-empty subaggregate, brace elision is assumed and the
4238 initializer is considered for the initialization of the first
4239 member of the subaggregate. */
4240 if (!brace_enclosed_p
4241 && can_convert_arg (type, TREE_TYPE (old_init_value), old_init_value))
4243 *initp = TREE_CHAIN (old_init);
4244 TREE_CHAIN (old_init) = NULL_TREE;
4248 string_init_p = false;
4249 if (TREE_CODE (old_init_value) == STRING_CST
4250 && TREE_CODE (type) == ARRAY_TYPE
4251 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4253 /* [dcl.init.string]
4255 A char array (whether plain char, signed char, or unsigned char)
4256 can be initialized by a string-literal (optionally enclosed in
4257 braces); a wchar_t array can be initialized by a wide
4258 string-literal (optionally enclosed in braces). */
4259 new_init = old_init;
4260 /* Move past the initializer. */
4261 *initp = TREE_CHAIN (old_init);
4262 TREE_CHAIN (old_init) = NULL_TREE;
4263 string_init_p = true;
4267 /* Build a CONSTRUCTOR to hold the contents of the aggregate. */
4268 new_init = build_constructor (NULL_TREE, NULL_TREE);
4270 if (CLASS_TYPE_P (type))
4274 field = next_initializable_field (TYPE_FIELDS (type));
4280 An initializer for an aggregate member that is an
4281 empty class shall have the form of an empty
4282 initializer-list {}. */
4283 if (!brace_enclosed_p)
4285 error ("initializer for %qT must be brace-enclosed", type);
4286 return error_mark_node;
4291 /* Loop through the initializable fields, gathering
4297 /* Handle designated initializers, as an extension. */
4298 if (TREE_PURPOSE (*initp))
4301 pedwarn ("ISO C++ does not allow designated initializers");
4302 field = lookup_field_1 (type, TREE_PURPOSE (*initp),
4303 /*want_type=*/false);
4304 if (!field || TREE_CODE (field) != FIELD_DECL)
4305 error ("%qT has no non-static data member named %qD",
4306 type, TREE_PURPOSE (*initp));
4311 field_init = reshape_init (TREE_TYPE (field), initp);
4312 if (field_init == error_mark_node)
4313 return error_mark_node;
4314 TREE_CHAIN (field_init) = CONSTRUCTOR_ELTS (new_init);
4315 CONSTRUCTOR_ELTS (new_init) = field_init;
4318 When a union is initialized with a brace-enclosed
4319 initializer, the braces shall only contain an
4320 initializer for the first member of the union. */
4321 if (TREE_CODE (type) == UNION_TYPE)
4323 field = next_initializable_field (TREE_CHAIN (field));
4327 else if (TREE_CODE (type) == ARRAY_TYPE
4328 || TREE_CODE (type) == VECTOR_TYPE)
4330 /* If the bound of the array is known, take no more initializers
4331 than are allowed. */
4332 tree max_index = NULL_TREE;
4333 if (TREE_CODE (type) == ARRAY_TYPE)
4335 if (TYPE_DOMAIN (type))
4336 max_index = array_type_nelts (type);
4340 /* For a vector, the representation type is a struct
4341 containing a single member which is an array of the
4342 appropriate size. */
4343 tree rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4344 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4345 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS
4349 if (!reshape_init_array (TREE_TYPE (type), max_index,
4351 return error_mark_node;
4356 /* The initializers were placed in reverse order in the
4358 CONSTRUCTOR_ELTS (new_init) = nreverse (CONSTRUCTOR_ELTS (new_init));
4360 if (TREE_CODE (old_init) == TREE_LIST)
4361 new_init = build_tree_list (TREE_PURPOSE (old_init), new_init);
4364 /* If there are more initializers than necessary, issue a
4368 if (brace_enclosed_p)
4369 error ("too many initializers for %qT", type);
4370 else if (warn_missing_braces && !string_init_p)
4371 warning (0, "missing braces around initializer");
4377 /* Verify INIT (the initializer for DECL), and record the
4378 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4379 grok_reference_init.
4381 If the return value is non-NULL, it is an expression that must be
4382 evaluated dynamically to initialize DECL. */
4385 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4387 tree type = TREE_TYPE (decl);
4388 tree init_code = NULL;
4390 /* If `start_decl' didn't like having an initialization, ignore it now. */
4391 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4394 /* If an initializer is present, DECL_INITIAL has been
4395 error_mark_node, to indicate that an as-of-yet unevaluated
4396 initialization will occur. From now on, DECL_INITIAL reflects
4397 the static initialization -- if any -- of DECL. */
4398 DECL_INITIAL (decl) = NULL_TREE;
4400 /* Things that are going to be initialized need to have complete
4402 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4404 if (type == error_mark_node)
4405 /* We will have already complained. */
4407 else if (init && COMPLETE_TYPE_P (type)
4408 && !TREE_CONSTANT (TYPE_SIZE (type)))
4410 error ("variable-sized object %qD may not be initialized", decl);
4413 else if (TREE_CODE (type) == ARRAY_TYPE
4414 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4416 error ("elements of array %q#D have incomplete type", decl);
4419 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4421 error ("%qD has incomplete type", decl);
4422 TREE_TYPE (decl) = error_mark_node;
4426 if (TREE_CODE (decl) == CONST_DECL)
4428 gcc_assert (TREE_CODE (decl) != REFERENCE_TYPE);
4430 DECL_INITIAL (decl) = init;
4432 gcc_assert (init != NULL_TREE);
4435 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4436 init = grok_reference_init (decl, type, init, cleanup);
4439 if (TREE_CODE (init) == CONSTRUCTOR
4440 && BRACE_ENCLOSED_INITIALIZER_P (init))
4442 /* [dcl.init] paragraph 13,
4443 If T is a scalar type, then a declaration of the form
4448 reshape_init will complain about the extra braces,
4449 and doesn't do anything useful in the case where TYPE is
4450 scalar, so just don't call it. */
4451 if (CP_AGGREGATE_TYPE_P (type))
4452 init = reshape_init (type, &init);
4454 if ((*targetm.vector_opaque_p) (type))
4456 error ("opaque vector types cannot be initialized");
4457 init = error_mark_node;
4461 /* If DECL has an array type without a specific bound, deduce the
4462 array size from the initializer. */
4463 maybe_deduce_size_from_array_init (decl, init);
4464 type = TREE_TYPE (decl);
4466 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4468 if (TREE_CODE (type) == ARRAY_TYPE)
4469 goto initialize_aggr;
4470 else if (TREE_CODE (init) == CONSTRUCTOR
4471 && BRACE_ENCLOSED_INITIALIZER_P (init))
4473 if (TYPE_NON_AGGREGATE_CLASS (type))
4475 error ("%qD must be initialized by constructor, "
4478 init = error_mark_node;
4481 goto dont_use_constructor;
4485 int saved_stmts_are_full_exprs_p;
4488 saved_stmts_are_full_exprs_p = 0;
4489 if (building_stmt_tree ())
4491 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4492 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4494 init = build_aggr_init (decl, init, flags);
4495 if (building_stmt_tree ())
4496 current_stmt_tree ()->stmts_are_full_exprs_p =
4497 saved_stmts_are_full_exprs_p;
4503 dont_use_constructor:
4504 if (TREE_CODE (init) != TREE_VEC)
4506 init_code = store_init_value (decl, init);
4507 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4508 && DECL_INITIAL (decl)
4509 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4510 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4511 warning (0, "array %qD initialized by parenthesized string literal %qE",
4512 decl, DECL_INITIAL (decl));
4517 else if (DECL_EXTERNAL (decl))
4519 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4520 goto initialize_aggr;
4521 else if (IS_AGGR_TYPE (type))
4523 tree core_type = strip_array_types (type);
4525 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4526 error ("structure %qD with uninitialized const members", decl);
4527 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4528 error ("structure %qD with uninitialized reference members", decl);
4530 check_for_uninitialized_const_var (decl);
4533 check_for_uninitialized_const_var (decl);
4535 if (init && init != error_mark_node)
4536 init_code = build2 (INIT_EXPR, type, decl, init);
4541 /* If DECL is not a local variable, give it RTL. */
4544 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4546 int toplev = toplevel_bindings_p ();
4548 const char *filename;
4550 /* Set the DECL_ASSEMBLER_NAME for the object. */
4553 /* The `register' keyword, when used together with an
4554 asm-specification, indicates that the variable should be
4555 placed in a particular register. */
4556 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4558 change_decl_assembler_name (decl, get_identifier (asmspec));
4559 DECL_HARD_REGISTER (decl) = 1;
4563 if (TREE_CODE (decl) == FUNCTION_DECL
4564 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4565 set_builtin_user_assembler_name (decl, asmspec);
4566 set_user_assembler_name (decl, asmspec);
4570 /* Handle non-variables up front. */
4571 if (TREE_CODE (decl) != VAR_DECL)
4573 rest_of_decl_compilation (decl, toplev, at_eof);
4577 /* If we see a class member here, it should be a static data
4579 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4581 gcc_assert (TREE_STATIC (decl));
4582 /* An in-class declaration of a static data member should be
4583 external; it is only a declaration, and not a definition. */
4584 if (init == NULL_TREE)
4585 gcc_assert (DECL_EXTERNAL (decl));
4588 /* We don't create any RTL for local variables. */
4589 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4592 /* We defer emission of local statics until the corresponding
4593 DECL_EXPR is expanded. */
4594 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4596 /* We try to defer namespace-scope static constants so that they are
4597 not emitted into the object file unnecessarily. */
4598 filename = input_filename;
4599 if (!DECL_VIRTUAL_P (decl)
4600 && TREE_READONLY (decl)
4601 && DECL_INITIAL (decl) != NULL_TREE
4602 && DECL_INITIAL (decl) != error_mark_node
4604 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4606 && !TREE_PUBLIC (decl))
4608 /* Fool with the linkage of static consts according to #pragma
4610 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4611 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4613 TREE_PUBLIC (decl) = 1;
4614 DECL_EXTERNAL (decl) = finfo->interface_only;
4619 /* Likewise for template instantiations. */
4620 else if (DECL_LANG_SPECIFIC (decl)
4621 && DECL_IMPLICIT_INSTANTIATION (decl))
4624 /* If we're not deferring, go ahead and assemble the variable. */
4626 rest_of_decl_compilation (decl, toplev, at_eof);
4629 /* Generate code to initialize DECL (a local variable). */
4632 initialize_local_var (tree decl, tree init)
4634 tree type = TREE_TYPE (decl);
4637 gcc_assert (TREE_CODE (decl) == VAR_DECL
4638 || TREE_CODE (decl) == RESULT_DECL);
4639 gcc_assert (!TREE_STATIC (decl));
4641 if (DECL_SIZE (decl) == NULL_TREE)
4643 /* If we used it already as memory, it must stay in memory. */
4644 DECL_INITIAL (decl) = NULL_TREE;
4645 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4648 if (DECL_SIZE (decl) && type != error_mark_node)
4652 /* Compute and store the initial value. */
4653 already_used = TREE_USED (decl) || TREE_USED (type);
4655 /* Perform the initialization. */
4658 int saved_stmts_are_full_exprs_p;
4660 gcc_assert (building_stmt_tree ());
4661 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4662 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4663 finish_expr_stmt (init);
4664 current_stmt_tree ()->stmts_are_full_exprs_p =
4665 saved_stmts_are_full_exprs_p;
4668 /* Set this to 0 so we can tell whether an aggregate which was
4669 initialized was ever used. Don't do this if it has a
4670 destructor, so we don't complain about the 'resource
4671 allocation is initialization' idiom. Now set
4672 attribute((unused)) on types so decls of that type will be
4673 marked used. (see TREE_USED, above.) */
4674 if (TYPE_NEEDS_CONSTRUCTING (type)
4676 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4677 && DECL_NAME (decl))
4678 TREE_USED (decl) = 0;
4679 else if (already_used)
4680 TREE_USED (decl) = 1;
4683 /* Generate a cleanup, if necessary. */
4684 cleanup = cxx_maybe_build_cleanup (decl);
4685 if (DECL_SIZE (decl) && cleanup)
4686 finish_decl_cleanup (decl, cleanup);
4689 /* DECL is a VAR_DECL for a compiler-generated variable with static
4690 storage duration (like a virtual table) whose initializer is a
4691 compile-time constant. Initialize the variable and provide it to
4695 initialize_artificial_var (tree decl, tree init)
4697 DECL_INITIAL (decl) = build_constructor (NULL_TREE, init);
4698 DECL_INITIALIZED_P (decl) = 1;
4699 determine_visibility (decl);
4700 layout_var_decl (decl);
4701 maybe_commonize_var (decl);
4702 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4705 /* Finish processing of a declaration;
4706 install its line number and initial value.
4707 If the length of an array type is not known before,
4708 it must be determined now, from the initial value, or it is an error.
4710 INIT holds the value of an initializer that should be allowed to escape
4713 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4714 if the (init) syntax was used. */
4717 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4721 const char *asmspec = NULL;
4722 int was_readonly = 0;
4723 bool var_definition_p = false;
4725 if (decl == error_mark_node)
4730 error ("assignment (not initialization) in declaration");
4734 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4736 /* Assume no cleanup is required. */
4737 cleanup = NULL_TREE;
4739 /* If a name was specified, get the string. */
4740 if (global_scope_p (current_binding_level))
4741 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4743 asmspec = TREE_STRING_POINTER (asmspec_tree);
4745 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4747 error ("cannot initialize %qD to namespace %qD", decl, init);
4751 if (current_class_type
4752 && CP_DECL_CONTEXT (decl) == current_class_type
4753 && TYPE_BEING_DEFINED (current_class_type)
4754 && (DECL_INITIAL (decl) || init))
4755 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4757 type = TREE_TYPE (decl);
4759 if (type == error_mark_node)
4762 if (processing_template_decl)
4764 /* Add this declaration to the statement-tree. */
4765 if (at_function_scope_p ())
4766 add_decl_expr (decl);
4768 if (init && DECL_INITIAL (decl))
4769 DECL_INITIAL (decl) = init;
4770 if (TREE_CODE (decl) == VAR_DECL
4771 && !DECL_PRETTY_FUNCTION_P (decl)
4772 && !dependent_type_p (TREE_TYPE (decl)))
4773 maybe_deduce_size_from_array_init (decl, init);
4778 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4779 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4781 /* Take care of TYPE_DECLs up front. */
4782 if (TREE_CODE (decl) == TYPE_DECL)
4784 if (type != error_mark_node
4785 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4787 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4788 warning (0, "shadowing previous type declaration of %q#D", decl);
4789 set_identifier_type_value (DECL_NAME (decl), decl);
4792 /* If we have installed this as the canonical typedef for this
4793 type, and that type has not been defined yet, delay emitting
4794 the debug information for it, as we will emit it later. */
4795 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4796 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4797 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4799 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4804 /* A reference will be modified here, as it is initialized. */
4805 if (! DECL_EXTERNAL (decl)
4806 && TREE_READONLY (decl)
4807 && TREE_CODE (type) == REFERENCE_TYPE)
4810 TREE_READONLY (decl) = 0;
4813 if (TREE_CODE (decl) == VAR_DECL)
4815 /* Only PODs can have thread-local storage. Other types may require
4816 various kinds of non-trivial initialization. */
4817 if (DECL_THREAD_LOCAL (decl) && !pod_type_p (TREE_TYPE (decl)))
4818 error ("%qD cannot be thread-local because it has non-POD type %qT",
4819 decl, TREE_TYPE (decl));
4820 /* Convert the initializer to the type of DECL, if we have not
4821 already initialized DECL. */
4822 if (!DECL_INITIALIZED_P (decl)
4823 /* If !DECL_EXTERNAL then DECL is being defined. In the
4824 case of a static data member initialized inside the
4825 class-specifier, there can be an initializer even if DECL
4826 is *not* defined. */
4827 && (!DECL_EXTERNAL (decl) || init))
4829 init = check_initializer (decl, init, flags, &cleanup);
4830 /* Thread-local storage cannot be dynamically initialized. */
4831 if (DECL_THREAD_LOCAL (decl) && init)
4833 error ("%qD is thread-local and so cannot be dynamically "
4834 "initialized", decl);
4837 if (DECL_EXTERNAL (decl) && init)
4839 /* The static data member cannot be initialized by a
4840 non-constant when being declared. */
4841 error ("%qD cannot be initialized by a non-constant expression"
4842 " when being declared", decl);
4843 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
4851 The memory occupied by any object of static storage
4852 duration is zero-initialized at program startup before
4853 any other initialization takes place.
4855 We cannot create an appropriate initializer until after
4856 the type of DECL is finalized. If DECL_INITIAL is set,
4857 then the DECL is statically initialized, and any
4858 necessary zero-initialization has already been performed. */
4859 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
4860 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
4861 /*nelts=*/NULL_TREE,
4862 /*static_storage_p=*/true);
4863 /* Remember that the initialization for this variable has
4865 DECL_INITIALIZED_P (decl) = 1;
4866 /* This declaration is the definition of this variable,
4867 unless we are initializing a static data member within
4868 the class specifier. */
4869 if (!DECL_EXTERNAL (decl))
4870 var_definition_p = true;
4871 /* The variable is being defined, so determine its
4873 determine_visibility (decl);
4875 /* If the variable has an array type, lay out the type, even if
4876 there is no initializer. It is valid to index through the
4877 array, and we must get TYPE_ALIGN set correctly on the array
4879 else if (TREE_CODE (type) == ARRAY_TYPE)
4883 /* Add this declaration to the statement-tree. This needs to happen
4884 after the call to check_initializer so that the DECL_EXPR for a
4885 reference temp is added before the DECL_EXPR for the reference itself. */
4886 if (at_function_scope_p ())
4887 add_decl_expr (decl);
4889 if (TREE_CODE (decl) == VAR_DECL)
4890 layout_var_decl (decl);
4892 /* Output the assembler code and/or RTL code for variables and functions,
4893 unless the type is an undefined structure or union.
4894 If not, it will get done when the type is completed. */
4895 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4897 if (TREE_CODE (decl) == VAR_DECL)
4898 maybe_commonize_var (decl);
4900 make_rtl_for_nonlocal_decl (decl, init, asmspec);
4902 /* Check for abstractness of the type. Notice that there is no
4903 need to strip array types here since the check for those types
4904 is already done within create_array_type_for_decl. */
4905 if (TREE_CODE (type) == FUNCTION_TYPE
4906 || TREE_CODE (type) == METHOD_TYPE)
4907 abstract_virtuals_error (decl, TREE_TYPE (type));
4909 abstract_virtuals_error (decl, type);
4911 if (TREE_CODE (decl) == FUNCTION_DECL
4912 || TREE_TYPE (decl) == error_mark_node)
4913 /* No initialization required. */
4915 else if (DECL_EXTERNAL (decl)
4916 && ! (DECL_LANG_SPECIFIC (decl)
4917 && DECL_NOT_REALLY_EXTERN (decl)))
4920 DECL_INITIAL (decl) = init;
4924 /* A variable definition. */
4925 if (DECL_FUNCTION_SCOPE_P (decl))
4927 /* Initialize the local variable. */
4928 if (processing_template_decl)
4930 if (init || DECL_INITIAL (decl) == error_mark_node)
4931 DECL_INITIAL (decl) = init;
4933 else if (!TREE_STATIC (decl))
4934 initialize_local_var (decl, init);
4937 /* If a variable is defined, and then a subsequent
4938 definition with external linkage is encountered, we will
4939 get here twice for the same variable. We want to avoid
4940 calling expand_static_init more than once. For variables
4941 that are not static data members, we can call
4942 expand_static_init only when we actually process the
4943 initializer. It is not legal to redeclare a static data
4944 member, so this issue does not arise in that case. */
4945 if (var_definition_p && TREE_STATIC (decl))
4946 expand_static_init (decl, init);
4950 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
4951 reference, insert it in the statement-tree now. */
4953 push_cleanup (decl, cleanup, false);
4958 TREE_READONLY (decl) = 1;
4960 /* If this was marked 'used', be sure it will be output. */
4961 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
4962 mark_decl_referenced (decl);
4965 /* This is here for a midend callback from c-common.c. */
4968 finish_decl (tree decl, tree init, tree asmspec_tree)
4970 cp_finish_decl (decl, init, asmspec_tree, 0);
4973 /* Returns a declaration for a VAR_DECL as if:
4975 extern "C" TYPE NAME;
4977 had been seen. Used to create compiler-generated global
4981 declare_global_var (tree name, tree type)
4985 push_to_top_level ();
4986 decl = build_decl (VAR_DECL, name, type);
4987 TREE_PUBLIC (decl) = 1;
4988 DECL_EXTERNAL (decl) = 1;
4989 DECL_ARTIFICIAL (decl) = 1;
4990 /* If the user has explicitly declared this variable (perhaps
4991 because the code we are compiling is part of a low-level runtime
4992 library), then it is possible that our declaration will be merged
4993 with theirs by pushdecl. */
4994 decl = pushdecl (decl);
4995 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
4996 pop_from_top_level ();
5001 /* Returns a pointer to the `atexit' function. Note that if
5002 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5003 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5006 get_atexit_node (void)
5013 bool use_aeabi_atexit;
5018 if (flag_use_cxa_atexit)
5020 /* The declaration for `__cxa_atexit' is:
5022 int __cxa_atexit (void (*)(void *), void *, void *)
5024 We build up the argument types and then then function type
5027 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5028 /* First, build the pointer-to-function type for the first
5030 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5031 fn_type = build_function_type (void_type_node, arg_types);
5032 fn_ptr_type = build_pointer_type (fn_type);
5033 /* Then, build the rest of the argument types. */
5034 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5035 if (use_aeabi_atexit)
5037 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5038 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5042 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5043 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5045 /* And the final __cxa_atexit type. */
5046 fn_type = build_function_type (integer_type_node, arg_types);
5047 fn_ptr_type = build_pointer_type (fn_type);
5048 if (use_aeabi_atexit)
5049 name = "__aeabi_atexit";
5051 name = "__cxa_atexit";
5055 /* The declaration for `atexit' is:
5057 int atexit (void (*)());
5059 We build up the argument types and then then function type
5061 fn_type = build_function_type (void_type_node, void_list_node);
5062 fn_ptr_type = build_pointer_type (fn_type);
5063 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5064 /* Build the final atexit type. */
5065 fn_type = build_function_type (integer_type_node, arg_types);
5069 /* Now, build the function declaration. */
5070 push_lang_context (lang_name_c);
5071 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5072 mark_used (atexit_fndecl);
5073 pop_lang_context ();
5074 atexit_node = decay_conversion (atexit_fndecl);
5079 /* Returns the __dso_handle VAR_DECL. */
5082 get_dso_handle_node (void)
5084 if (dso_handle_node)
5085 return dso_handle_node;
5087 /* Declare the variable. */
5088 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5091 return dso_handle_node;
5094 /* Begin a new function with internal linkage whose job will be simply
5095 to destroy some particular variable. */
5097 static GTY(()) int start_cleanup_cnt;
5100 start_cleanup_fn (void)
5107 push_to_top_level ();
5109 /* No need to mangle this. */
5110 push_lang_context (lang_name_c);
5112 /* Build the parameter-types. */
5113 parmtypes = void_list_node;
5114 /* Functions passed to __cxa_atexit take an additional parameter.
5115 We'll just ignore it. After we implement the new calling
5116 convention for destructors, we can eliminate the use of
5117 additional cleanup functions entirely in the -fnew-abi case. */
5118 if (flag_use_cxa_atexit)
5119 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5120 /* Build the function type itself. */
5121 fntype = build_function_type (void_type_node, parmtypes);
5122 /* Build the name of the function. */
5123 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5124 /* Build the function declaration. */
5125 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5126 /* It's a function with internal linkage, generated by the
5128 TREE_PUBLIC (fndecl) = 0;
5129 DECL_ARTIFICIAL (fndecl) = 1;
5130 /* Make the function `inline' so that it is only emitted if it is
5131 actually needed. It is unlikely that it will be inlined, since
5132 it is only called via a function pointer, but we avoid unnecessary
5133 emissions this way. */
5134 DECL_INLINE (fndecl) = 1;
5135 DECL_DECLARED_INLINE_P (fndecl) = 1;
5136 DECL_INTERFACE_KNOWN (fndecl) = 1;
5137 /* Build the parameter. */
5138 if (flag_use_cxa_atexit)
5142 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5143 DECL_CONTEXT (parmdecl) = fndecl;
5144 TREE_USED (parmdecl) = 1;
5145 DECL_ARGUMENTS (fndecl) = parmdecl;
5149 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5151 pop_lang_context ();
5153 return current_function_decl;
5156 /* Finish the cleanup function begun by start_cleanup_fn. */
5159 end_cleanup_fn (void)
5161 expand_or_defer_fn (finish_function (0));
5163 pop_from_top_level ();
5166 /* Generate code to handle the destruction of DECL, an object with
5167 static storage duration. */
5170 register_dtor_fn (tree decl)
5177 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5178 return void_zero_node;
5180 /* Call build_cleanup before we enter the anonymous function so that
5181 any access checks will be done relative to the current scope,
5182 rather than the scope of the anonymous function. */
5183 build_cleanup (decl);
5185 /* Now start the function. */
5186 cleanup = start_cleanup_fn ();
5188 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5189 to the original function, rather than the anonymous one. That
5190 will make the back-end think that nested functions are in use,
5191 which causes confusion. */
5193 push_deferring_access_checks (dk_no_check);
5194 fcall = build_cleanup (decl);
5195 pop_deferring_access_checks ();
5197 /* Create the body of the anonymous function. */
5198 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5199 finish_expr_stmt (fcall);
5200 finish_compound_stmt (compound_stmt);
5203 /* Call atexit with the cleanup function. */
5204 cxx_mark_addressable (cleanup);
5205 mark_used (cleanup);
5206 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5207 if (flag_use_cxa_atexit)
5209 args = tree_cons (NULL_TREE,
5210 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5212 if (targetm.cxx.use_aeabi_atexit ())
5214 args = tree_cons (NULL_TREE, cleanup, args);
5215 args = tree_cons (NULL_TREE, null_pointer_node, args);
5219 args = tree_cons (NULL_TREE, null_pointer_node, args);
5220 args = tree_cons (NULL_TREE, cleanup, args);
5224 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5225 return build_function_call (get_atexit_node (), args);
5228 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5229 is its initializer. Generate code to handle the construction
5230 and destruction of DECL. */
5233 expand_static_init (tree decl, tree init)
5235 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5236 gcc_assert (TREE_STATIC (decl));
5238 /* Some variables require no initialization. */
5240 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5241 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5244 if (DECL_FUNCTION_SCOPE_P (decl))
5246 /* Emit code to perform this initialization but once. */
5247 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5248 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5249 tree guard, guard_addr, guard_addr_list;
5250 tree acquire_fn, release_fn, abort_fn;
5253 /* Emit code to perform this initialization but once. This code
5256 static <type> guard;
5257 if (!guard.first_byte) {
5258 if (__cxa_guard_acquire (&guard)) {
5261 // Do initialization.
5262 flag = true; __cxa_guard_release (&guard);
5263 // Register variable for destruction at end of program.
5265 if (!flag) __cxa_guard_abort (&guard);
5269 Note that the `flag' variable is only set to 1 *after* the
5270 initialization is complete. This ensures that an exception,
5271 thrown during the construction, will cause the variable to
5272 reinitialized when we pass through this code again, as per:
5276 If the initialization exits by throwing an exception, the
5277 initialization is not complete, so it will be tried again
5278 the next time control enters the declaration.
5280 This process should be thread-safe, too; multiple threads
5281 should not be able to initialize the variable more than
5284 /* Create the guard variable. */
5285 guard = get_guard (decl);
5287 /* This optimization isn't safe on targets with relaxed memory
5288 consistency. On such targets we force synchronization in
5289 __cxa_guard_acquire. */
5290 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5292 /* Begin the conditional initialization. */
5293 if_stmt = begin_if_stmt ();
5294 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5295 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5298 if (flag_threadsafe_statics)
5300 guard_addr = build_address (guard);
5301 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5303 acquire_fn = get_identifier ("__cxa_guard_acquire");
5304 release_fn = get_identifier ("__cxa_guard_release");
5305 abort_fn = get_identifier ("__cxa_guard_abort");
5306 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5308 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5310 tree vfntype = build_function_type (void_type_node, argtypes);
5311 acquire_fn = push_library_fn
5312 (acquire_fn, build_function_type (integer_type_node, argtypes));
5313 release_fn = push_library_fn (release_fn, vfntype);
5314 abort_fn = push_library_fn (abort_fn, vfntype);
5318 release_fn = identifier_global_value (release_fn);
5319 abort_fn = identifier_global_value (abort_fn);
5322 inner_if_stmt = begin_if_stmt ();
5323 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5326 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5327 begin = get_target_expr (boolean_false_node);
5328 flag = TARGET_EXPR_SLOT (begin);
5330 TARGET_EXPR_CLEANUP (begin)
5331 = build3 (COND_EXPR, void_type_node, flag,
5333 build_call (abort_fn, guard_addr_list));
5334 CLEANUP_EH_ONLY (begin) = 1;
5336 /* Do the initialization itself. */
5337 init = add_stmt_to_compound (begin, init);
5338 init = add_stmt_to_compound
5339 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5340 init = add_stmt_to_compound
5341 (init, build_call (release_fn, guard_addr_list));
5344 init = add_stmt_to_compound (init, set_guard (guard));
5346 /* Use atexit to register a function for destroying this static
5348 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5350 finish_expr_stmt (init);
5352 if (flag_threadsafe_statics)
5354 finish_compound_stmt (inner_then_clause);
5355 finish_then_clause (inner_if_stmt);
5356 finish_if_stmt (inner_if_stmt);
5359 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5361 finish_compound_stmt (then_clause);
5362 finish_then_clause (if_stmt);
5363 finish_if_stmt (if_stmt);
5367 static_aggregates = tree_cons (init, decl, static_aggregates);
5371 /* Make TYPE a complete type based on INITIAL_VALUE.
5372 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5373 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5374 3 if the initializer list is empty (in pedantic mode). */
5377 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5380 tree type, elt_type;
5384 /* An array of character type can be initialized from a
5385 brace-enclosed string constant. */
5386 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5387 && TREE_CODE (initial_value) == CONSTRUCTOR
5388 && CONSTRUCTOR_ELTS (initial_value)
5389 && (TREE_CODE (TREE_VALUE (CONSTRUCTOR_ELTS (initial_value)))
5391 && TREE_CHAIN (CONSTRUCTOR_ELTS (initial_value)) == NULL_TREE)
5392 initial_value = TREE_VALUE (CONSTRUCTOR_ELTS (initial_value));
5395 failure = complete_array_type (ptype, initial_value, do_default);
5397 /* We can create the array before the element type is complete, which
5398 means that we didn't have these two bits set in the original type
5399 either. In completing the type, we are expected to propagate these
5400 bits. See also complete_type which does the same thing for arrays
5403 if (TYPE_DOMAIN (type))
5405 elt_type = TREE_TYPE (type);
5406 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5407 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5408 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5414 /* Return zero if something is declared to be a member of type
5415 CTYPE when in the context of CUR_TYPE. STRING is the error
5416 message to print in that case. Otherwise, quietly return 1. */
5419 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5421 if (ctype && ctype != cur_type)
5423 if (flags == DTOR_FLAG)
5424 error ("destructor for alien class %qT cannot be a member", ctype);
5426 error ("constructor for alien class %qT cannot be a member", ctype);
5432 /* Subroutine of `grokdeclarator'. */
5434 /* Generate errors possibly applicable for a given set of specifiers.
5435 This is for ARM $7.1.2. */
5438 bad_specifiers (tree object,
5447 error ("%qD declared as a %<virtual%> %s", object, type);
5449 error ("%qD declared as an %<inline%> %s", object, type);
5451 error ("%<const%> and %<volatile%> function specifiers on "
5452 "%qD invalid in %s declaration",
5455 cp_error_at ("%qD declared as a friend", object);
5457 && (TREE_CODE (object) == TYPE_DECL
5458 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5459 && !TYPE_REFFN_P (TREE_TYPE (object))
5460 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5461 cp_error_at ("%qD declared with an exception specification", object);
5464 /* CTYPE is class type, or null if non-class.
5465 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5467 DECLARATOR is the function's name.
5468 PARMS is a chain of PARM_DECLs for the function.
5469 VIRTUALP is truthvalue of whether the function is virtual or not.
5470 FLAGS are to be passed through to `grokclassfn'.
5471 QUALS are qualifiers indicating whether the function is `const'
5473 RAISES is a list of exceptions that this function can raise.
5474 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5475 not look, and -1 if we should not call `grokclassfn' at all.
5477 SFK is the kind of special function (if any) for the new function.
5479 Returns `NULL_TREE' if something goes wrong, after issuing
5480 applicable error messages. */
5483 grokfndecl (tree ctype,
5487 tree orig_declarator,
5489 enum overload_flags flags,
5496 special_function_kind sfk,
5503 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5504 int has_default_arg = 0;
5508 type = build_exception_variant (type, raises);
5510 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5511 DECL_ARGUMENTS (decl) = parms;
5512 /* Propagate volatile out from type to decl. */
5513 if (TYPE_VOLATILE (type))
5514 TREE_THIS_VOLATILE (decl) = 1;
5516 /* If this decl has namespace scope, set that up. */
5518 set_decl_namespace (decl, in_namespace, friendp);
5520 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5522 /* `main' and builtins have implicit 'C' linkage. */
5523 if ((MAIN_NAME_P (declarator)
5524 || (IDENTIFIER_LENGTH (declarator) > 10
5525 && IDENTIFIER_POINTER (declarator)[0] == '_'
5526 && IDENTIFIER_POINTER (declarator)[1] == '_'
5527 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5528 && current_lang_name == lang_name_cplusplus
5529 && ctype == NULL_TREE
5530 /* NULL_TREE means global namespace. */
5531 && DECL_CONTEXT (decl) == NULL_TREE)
5532 SET_DECL_LANGUAGE (decl, lang_c);
5534 /* Should probably propagate const out from type to decl I bet (mrs). */
5537 DECL_STATIC_FUNCTION_P (decl) = 1;
5538 DECL_CONTEXT (decl) = ctype;
5542 DECL_CONTEXT (decl) = ctype;
5544 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5546 if (processing_template_decl)
5547 error ("cannot declare %<::main%> to be a template");
5549 error ("cannot declare %<::main%> to be inline");
5551 error ("cannot declare %<::main%> to be static");
5552 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5555 error ("%<::main%> must return %<int%>");
5556 TREE_TYPE (TREE_TYPE (decl)) = integer_type_node;
5562 /* Members of anonymous types and local classes have no linkage; make
5563 them internal. If a typedef is made later, this will be changed. */
5564 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5565 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5570 /* [basic.link]: A name with no linkage (notably, the name of a class
5571 or enumeration declared in a local scope) shall not be used to
5572 declare an entity with linkage.
5574 Only check this for public decls for now. See core 319, 389. */
5575 t = no_linkage_check (TREE_TYPE (decl),
5576 /*relaxed_p=*/false);
5579 if (TYPE_ANONYMOUS_P (t))
5581 if (DECL_EXTERN_C_P (decl))
5582 /* Allow this; it's pretty common in C. */;
5585 pedwarn ("non-local function %q#D uses anonymous type",
5587 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5588 cp_pedwarn_at ("%q#D does not refer to the unqualified "
5589 "type, so it is not used for linkage",
5594 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5598 TREE_PUBLIC (decl) = publicp;
5601 DECL_INTERFACE_KNOWN (decl) = 1;
5602 DECL_NOT_REALLY_EXTERN (decl) = 1;
5605 /* If the declaration was declared inline, mark it as such. */
5607 DECL_DECLARED_INLINE_P (decl) = 1;
5608 /* We inline functions that are explicitly declared inline, or, when
5609 the user explicitly asks us to, all functions. */
5610 if (DECL_DECLARED_INLINE_P (decl)
5611 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5612 DECL_INLINE (decl) = 1;
5614 DECL_EXTERNAL (decl) = 1;
5615 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5617 error ("%smember function %qD cannot have cv-qualifier",
5618 (ctype ? "static " : "non-"), decl);
5619 quals = TYPE_UNQUALIFIED;
5622 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5623 grok_op_properties (decl, /*complain=*/true);
5625 if (ctype && decl_function_context (decl))
5626 DECL_NO_STATIC_CHAIN (decl) = 1;
5628 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5629 if (TREE_PURPOSE (t)
5630 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5632 has_default_arg = 1;
5637 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5641 ("defining explicit specialization %qD in friend declaration",
5645 tree fns = TREE_OPERAND (orig_declarator, 0);
5646 tree args = TREE_OPERAND (orig_declarator, 1);
5648 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5650 /* Something like `template <class T> friend void f<T>()'. */
5651 error ("invalid use of template-id %qD in declaration "
5652 "of primary template",
5658 /* A friend declaration of the form friend void f<>(). Record
5659 the information in the TEMPLATE_ID_EXPR. */
5660 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5662 if (TREE_CODE (fns) == COMPONENT_REF)
5664 /* Due to bison parser ickiness, we will have already looked
5665 up an operator_name or PFUNCNAME within the current class
5666 (see template_id in parse.y). If the current class contains
5667 such a name, we'll get a COMPONENT_REF here. Undo that. */
5669 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5670 == current_class_type);
5671 fns = TREE_OPERAND (fns, 1);
5673 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5674 || TREE_CODE (fns) == OVERLOAD);
5675 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5677 if (has_default_arg)
5679 error ("default arguments are not allowed in declaration "
5680 "of friend template specialization %qD",
5687 error ("%<inline%> is not allowed in declaration of friend "
5688 "template specialization %qD",
5696 /* Make the init_value nonzero so pushdecl knows this is not
5697 tentative. error_mark_node is replaced later with the BLOCK. */
5698 DECL_INITIAL (decl) = error_mark_node;
5700 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5701 TREE_NOTHROW (decl) = 1;
5703 /* Caller will do the rest of this. */
5707 if (ctype != NULL_TREE)
5709 if (sfk == sfk_constructor)
5710 DECL_CONSTRUCTOR_P (decl) = 1;
5712 grokclassfn (ctype, decl, flags, quals);
5715 decl = check_explicit_specialization (orig_declarator, decl,
5717 2 * (funcdef_flag != 0) +
5718 4 * (friendp != 0));
5719 if (decl == error_mark_node)
5724 cplus_decl_attributes (&decl, *attrlist, 0);
5725 *attrlist = NULL_TREE;
5728 if (ctype != NULL_TREE
5729 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5734 old_decl = check_classfn (ctype, decl,
5735 (processing_template_decl
5736 > template_class_depth (ctype))
5737 ? current_template_parms
5740 if (old_decl && TREE_CODE (old_decl) == TEMPLATE_DECL)
5741 /* Because grokfndecl is always supposed to return a
5742 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5743 here. We depend on our callers to figure out that its
5744 really a template that's being returned. */
5745 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5747 if (old_decl && DECL_STATIC_FUNCTION_P (old_decl)
5748 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5749 /* Remove the `this' parm added by grokclassfn.
5750 XXX Isn't this done in start_function, too? */
5751 revert_static_member_fn (decl);
5752 if (old_decl && DECL_ARTIFICIAL (old_decl))
5753 error ("definition of implicitly-declared %qD", old_decl);
5760 /* Since we've smashed OLD_DECL to its
5761 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5762 if (TREE_CODE (decl) == TEMPLATE_DECL)
5763 decl = DECL_TEMPLATE_RESULT (decl);
5765 /* Attempt to merge the declarations. This can fail, in
5766 the case of some invalid specialization declarations. */
5767 pushed_scope = push_scope (ctype);
5768 ok = duplicate_decls (decl, old_decl);
5770 pop_scope (pushed_scope);
5773 error ("no %q#D member function declared in class %qT",
5781 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5784 if (ctype == NULL_TREE || check)
5788 DECL_VIRTUAL_P (decl) = 1;
5793 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5794 the linkage that DECL will receive in the object file. */
5797 set_linkage_for_static_data_member (tree decl)
5799 /* A static data member always has static storage duration and
5800 external linkage. Note that static data members are forbidden in
5801 local classes -- the only situation in which a class has
5802 non-external linkage. */
5803 TREE_PUBLIC (decl) = 1;
5804 TREE_STATIC (decl) = 1;
5805 /* For non-template classes, static data members are always put
5806 out in exactly those files where they are defined, just as
5807 with ordinary namespace-scope variables. */
5808 if (!processing_template_decl)
5809 DECL_INTERFACE_KNOWN (decl) = 1;
5812 /* Create a VAR_DECL named NAME with the indicated TYPE.
5814 If SCOPE is non-NULL, it is the class type or namespace containing
5815 the variable. If SCOPE is NULL, the variable should is created in
5816 the innermost enclosings scope. */
5819 grokvardecl (tree type,
5821 const cp_decl_specifier_seq *declspecs,
5827 tree explicit_scope;
5829 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
5831 /* Compute the scope in which to place the variable, but remember
5832 whether or not that scope was explicitly specified by the user. */
5833 explicit_scope = scope;
5836 /* An explicit "extern" specifier indicates a namespace-scope
5838 if (declspecs->storage_class == sc_extern)
5839 scope = current_namespace;
5840 else if (!at_function_scope_p ())
5841 scope = current_scope ();
5845 && (/* If the variable is a namespace-scope variable declared in a
5846 template, we need DECL_LANG_SPECIFIC. */
5847 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
5848 /* Similarly for namespace-scope variables with language linkage
5850 || (TREE_CODE (scope) == NAMESPACE_DECL
5851 && current_lang_name != lang_name_cplusplus)
5852 /* Similarly for static data members. */
5854 decl = build_lang_decl (VAR_DECL, name, type);
5856 decl = build_decl (VAR_DECL, name, type);
5858 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
5859 set_decl_namespace (decl, explicit_scope, 0);
5861 DECL_CONTEXT (decl) = scope;
5863 if (declspecs->storage_class == sc_extern)
5865 DECL_THIS_EXTERN (decl) = 1;
5866 DECL_EXTERNAL (decl) = !initialized;
5869 if (DECL_CLASS_SCOPE_P (decl))
5871 set_linkage_for_static_data_member (decl);
5872 /* This function is only called with out-of-class definitions. */
5873 DECL_EXTERNAL (decl) = 0;
5875 /* At top level, either `static' or no s.c. makes a definition
5876 (perhaps tentative), and absence of `static' makes it public. */
5877 else if (toplevel_bindings_p ())
5879 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
5880 && (DECL_THIS_EXTERN (decl) || ! constp));
5881 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5883 /* Not at top level, only `static' makes a static definition. */
5886 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
5887 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5890 if (declspecs->specs[(int)ds_thread])
5892 if (targetm.have_tls)
5893 DECL_THREAD_LOCAL (decl) = 1;
5895 /* A mere warning is sure to result in improper semantics
5896 at runtime. Don't bother to allow this to compile. */
5897 error ("thread-local storage not supported for this target");
5900 if (TREE_PUBLIC (decl))
5902 /* [basic.link]: A name with no linkage (notably, the name of a class
5903 or enumeration declared in a local scope) shall not be used to
5904 declare an entity with linkage.
5906 Only check this for public decls for now. */
5907 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
5910 if (TYPE_ANONYMOUS_P (t))
5912 if (DECL_EXTERN_C_P (decl))
5913 /* Allow this; it's pretty common in C. */
5917 /* DRs 132, 319 and 389 seem to indicate types with
5918 no linkage can only be used to declare extern "C"
5919 entities. Since it's not always an error in the
5920 ISO C++ 90 Standard, we only issue a warning. */
5921 warning (0, "non-local variable %q#D uses anonymous type",
5923 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5924 cp_warning_at ("%q#D does not refer to the unqualified "
5925 "type, so it is not used for linkage",
5930 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
5934 DECL_INTERFACE_KNOWN (decl) = 1;
5939 /* Create and return a canonical pointer to member function type, for
5940 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
5943 build_ptrmemfunc_type (tree type)
5947 tree unqualified_variant = NULL_TREE;
5949 if (type == error_mark_node)
5952 /* If a canonical type already exists for this type, use it. We use
5953 this method instead of type_hash_canon, because it only does a
5954 simple equality check on the list of field members. */
5956 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
5959 /* Make sure that we always have the unqualified pointer-to-member
5961 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
5963 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
5965 t = make_aggr_type (RECORD_TYPE);
5966 xref_basetypes (t, NULL_TREE);
5968 /* Let the front-end know this is a pointer to member function... */
5969 TYPE_PTRMEMFUNC_FLAG (t) = 1;
5970 /* ... and not really an aggregate. */
5971 SET_IS_AGGR_TYPE (t, 0);
5973 field = build_decl (FIELD_DECL, pfn_identifier, type);
5976 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
5977 TREE_CHAIN (field) = fields;
5980 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
5982 /* Zap out the name so that the back-end will give us the debugging
5983 information for this anonymous RECORD_TYPE. */
5984 TYPE_NAME (t) = NULL_TREE;
5986 /* If this is not the unqualified form of this pointer-to-member
5987 type, set the TYPE_MAIN_VARIANT for this type to be the
5988 unqualified type. Since they are actually RECORD_TYPEs that are
5989 not variants of each other, we must do this manually. */
5990 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
5992 t = build_qualified_type (t, cp_type_quals (type));
5993 TYPE_MAIN_VARIANT (t) = unqualified_variant;
5994 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
5995 TYPE_NEXT_VARIANT (unqualified_variant) = t;
5998 /* Cache this pointer-to-member type so that we can find it again
6000 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6005 /* Create and return a pointer to data member type. */
6008 build_ptrmem_type (tree class_type, tree member_type)
6010 if (TREE_CODE (member_type) == METHOD_TYPE)
6014 arg_types = TYPE_ARG_TYPES (member_type);
6015 class_type = (cp_build_qualified_type
6017 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6019 = build_method_type_directly (class_type,
6020 TREE_TYPE (member_type),
6021 TREE_CHAIN (arg_types));
6022 return build_ptrmemfunc_type (build_pointer_type (member_type));
6026 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6027 return build_offset_type (class_type, member_type);
6031 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6032 Check to see that the definition is valid. Issue appropriate error
6033 messages. Return 1 if the definition is particularly bad, or 0
6037 check_static_variable_definition (tree decl, tree type)
6039 /* Motion 10 at San Diego: If a static const integral data member is
6040 initialized with an integral constant expression, the initializer
6041 may appear either in the declaration (within the class), or in
6042 the definition, but not both. If it appears in the class, the
6043 member is a member constant. The file-scope definition is always
6045 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6047 error ("invalid in-class initialization of static data member "
6048 "of non-integral type %qT",
6050 /* If we just return the declaration, crashes will sometimes
6051 occur. We therefore return void_type_node, as if this were a
6052 friend declaration, to cause callers to completely ignore
6053 this declaration. */
6056 else if (!CP_TYPE_CONST_P (type))
6057 error ("ISO C++ forbids in-class initialization of non-const "
6058 "static member %qD",
6060 else if (pedantic && !INTEGRAL_TYPE_P (type))
6061 pedwarn ("ISO C++ forbids initialization of member constant "
6062 "%qD of non-integral type %qT", decl, type);
6067 /* Given the SIZE (i.e., number of elements) in an array, compute an
6068 appropriate index type for the array. If non-NULL, NAME is the
6069 name of the thing being declared. */
6072 compute_array_index_type (tree name, tree size)
6074 tree type = TREE_TYPE (size);
6077 /* The array bound must be an integer type. */
6078 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6081 error ("size of array %qD has non-integral type %qT", name, type);
6083 error ("size of array has non-integral type %qT", type);
6084 size = integer_one_node;
6085 type = TREE_TYPE (size);
6088 if (abi_version_at_least (2)
6089 /* We should only handle value dependent expressions specially. */
6090 ? value_dependent_expression_p (size)
6091 /* But for abi-1, we handled all instances in templates. This
6092 effects the manglings produced. */
6093 : processing_template_decl)
6094 return build_index_type (build_min (MINUS_EXPR, sizetype,
6095 size, integer_one_node));
6097 /* The size might be the result of a cast. */
6098 STRIP_TYPE_NOPS (size);
6100 /* It might be a const variable or enumeration constant. */
6101 size = integral_constant_value (size);
6103 /* Normally, the array-bound will be a constant. */
6104 if (TREE_CODE (size) == INTEGER_CST)
6106 /* Check to see if the array bound overflowed. Make that an
6107 error, no matter how generous we're being. */
6108 int old_flag_pedantic_errors = flag_pedantic_errors;
6109 int old_pedantic = pedantic;
6110 pedantic = flag_pedantic_errors = 1;
6111 constant_expression_warning (size);
6112 pedantic = old_pedantic;
6113 flag_pedantic_errors = old_flag_pedantic_errors;
6115 /* An array must have a positive number of elements. */
6116 if (INT_CST_LT (size, integer_zero_node))
6119 error ("size of array %qD is negative", name);
6121 error ("size of array is negative");
6122 size = integer_one_node;
6124 /* As an extension we allow zero-sized arrays. We always allow
6125 them in system headers because glibc uses them. */
6126 else if (integer_zerop (size) && pedantic && !in_system_header)
6129 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6131 pedwarn ("ISO C++ forbids zero-size array");
6134 else if (TREE_CONSTANT (size))
6136 /* `(int) &fn' is not a valid array bound. */
6138 error ("size of array %qD is not an integral constant-expression",
6141 error ("size of array is not an integral constant-expression");
6146 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6148 pedwarn ("ISO C++ forbids variable-size array");
6151 if (processing_template_decl && !TREE_CONSTANT (size))
6152 /* A variable sized array. */
6153 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6156 HOST_WIDE_INT saved_processing_template_decl;
6158 /* Compute the index of the largest element in the array. It is
6159 one less than the number of elements in the array. We save
6160 and restore PROCESSING_TEMPLATE_DECL so that computations in
6161 cp_build_binary_op will be appropriately folded. */
6162 saved_processing_template_decl = processing_template_decl;
6163 processing_template_decl = 0;
6164 itype = cp_build_binary_op (MINUS_EXPR,
6165 cp_convert (ssizetype, size),
6166 cp_convert (ssizetype, integer_one_node));
6167 itype = fold (itype);
6168 processing_template_decl = saved_processing_template_decl;
6170 if (!TREE_CONSTANT (itype))
6171 /* A variable sized array. */
6172 itype = variable_size (itype);
6173 /* Make sure that there was no overflow when creating to a signed
6174 index type. (For example, on a 32-bit machine, an array with
6175 size 2^32 - 1 is too big.) */
6176 else if (TREE_OVERFLOW (itype))
6178 error ("overflow in array dimension");
6179 TREE_OVERFLOW (itype) = 0;
6183 /* Create and return the appropriate index type. */
6184 return build_index_type (itype);
6187 /* Returns the scope (if any) in which the entity declared by
6188 DECLARATOR will be located. If the entity was declared with an
6189 unqualified name, NULL_TREE is returned. */
6192 get_scope_of_declarator (const cp_declarator *declarator)
6194 while (declarator && declarator->kind != cdk_id)
6195 declarator = declarator->declarator;
6197 /* If the declarator-id is a SCOPE_REF, the scope in which the
6198 declaration occurs is the first operand. */
6200 && declarator->u.id.qualifying_scope)
6201 return declarator->u.id.qualifying_scope;
6203 /* Otherwise, the declarator is not a qualified name; the entity will
6204 be declared in the current scope. */
6208 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6209 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6213 create_array_type_for_decl (tree name, tree type, tree size)
6215 tree itype = NULL_TREE;
6216 const char* error_msg;
6218 /* If things have already gone awry, bail now. */
6219 if (type == error_mark_node || size == error_mark_node)
6220 return error_mark_node;
6222 /* Assume that everything will go OK. */
6225 /* There are some types which cannot be array elements. */
6226 switch (TREE_CODE (type))
6229 error_msg = "array of void";
6233 error_msg = "array of functions";
6236 case REFERENCE_TYPE:
6237 error_msg = "array of references";
6241 error_msg = "array of function members";
6248 /* If something went wrong, issue an error-message and return. */
6252 error ("declaration of %qD as %s", name, error_msg);
6254 error ("creating %s", error_msg);
6256 return error_mark_node;
6261 The constant expressions that specify the bounds of the arrays
6262 can be omitted only for the first member of the sequence. */
6263 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6266 error ("declaration of %qD as multidimensional array must "
6267 "have bounds for all dimensions except the first",
6270 error ("multidimensional array must have bounds for all "
6271 "dimensions except the first");
6273 return error_mark_node;
6276 /* Figure out the index type for the array. */
6278 itype = compute_array_index_type (name, size);
6281 T is called the array element type; this type shall not be [...] an
6282 abstract class type. */
6283 abstract_virtuals_error (name, type);
6285 return build_cplus_array_type (type, itype);
6288 /* Check that it's OK to declare a function with the indicated TYPE.
6289 SFK indicates the kind of special function (if any) that this
6290 function is. OPTYPE is the type given in a conversion operator
6291 declaration, or the class type for a constructor/destructor.
6292 Returns the actual return type of the function; that
6293 may be different than TYPE if an error occurs, or for certain
6294 special functions. */
6297 check_special_function_return_type (special_function_kind sfk,
6303 case sfk_constructor:
6305 error ("return type specification for constructor invalid");
6307 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6308 type = build_pointer_type (optype);
6310 type = void_type_node;
6313 case sfk_destructor:
6315 error ("return type specification for destructor invalid");
6316 /* We can't use the proper return type here because we run into
6317 problems with ambiguous bases and covariant returns.
6318 Java classes are left unchanged because (void *) isn't a valid
6319 Java type, and we don't want to change the Java ABI. */
6320 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6321 type = build_pointer_type (void_type_node);
6323 type = void_type_node;
6326 case sfk_conversion:
6327 if (type && !same_type_p (type, optype))
6328 error ("operator %qT declared to return %qT", optype, type);
6330 pedwarn ("return type specified for %<operator %T%>", optype);
6341 /* A variable or data member (whose unqualified name is IDENTIFIER)
6342 has been declared with the indicated TYPE. If the TYPE is not
6343 acceptable, issue an error message and return a type to use for
6344 error-recovery purposes. */
6347 check_var_type (tree identifier, tree type)
6349 if (VOID_TYPE_P (type))
6352 error ("unnamed variable or field declared void");
6353 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6355 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6356 error ("variable or field %qE declared void", identifier);
6359 error ("variable or field declared void");
6360 type = integer_type_node;
6366 /* Given declspecs and a declarator (abstract or otherwise), determine
6367 the name and type of the object declared and construct a DECL node
6370 DECLSPECS is a chain of tree_list nodes whose value fields
6371 are the storage classes and type specifiers.
6373 DECL_CONTEXT says which syntactic context this declaration is in:
6374 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6375 FUNCDEF for a function definition. Like NORMAL but a few different
6376 error messages in each case. Return value may be zero meaning
6377 this definition is too screwy to try to parse.
6378 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6379 handle member functions (which have FIELD context).
6380 Return value may be zero meaning this definition is too screwy to
6382 PARM for a parameter declaration (either within a function prototype
6383 or before a function body). Make a PARM_DECL, or return void_type_node.
6384 CATCHPARM for a parameter declaration before a catch clause.
6385 TYPENAME if for a typename (in a cast or sizeof).
6386 Don't make a DECL node; just return the ..._TYPE node.
6387 FIELD for a struct or union field; make a FIELD_DECL.
6388 BITFIELD for a field with specified width.
6389 INITIALIZED is 1 if the decl has an initializer.
6391 ATTRLIST is a pointer to the list of attributes, which may be NULL
6392 if there are none; *ATTRLIST may be modified if attributes from inside
6393 the declarator should be applied to the declaration.
6395 When this function is called, scoping variables (such as
6396 CURRENT_CLASS_TYPE) should reflect the scope in which the
6397 declaration occurs, not the scope in which the new declaration will
6398 be placed. For example, on:
6402 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6403 should not be `S'. */
6406 grokdeclarator (const cp_declarator *declarator,
6407 const cp_decl_specifier_seq *declspecs,
6408 enum decl_context decl_context,
6412 tree type = NULL_TREE;
6415 int virtualp, explicitp, friendp, inlinep, staticp;
6416 int explicit_int = 0;
6417 int explicit_char = 0;
6418 int defaulted_int = 0;
6419 tree dependant_name = NULL_TREE;
6421 tree typedef_decl = NULL_TREE;
6422 const char *name = NULL;
6423 tree typedef_type = NULL_TREE;
6424 int funcdef_flag = 0;
6425 cp_declarator_kind innermost_code = cdk_error;
6428 /* See the code below that used this. */
6429 tree decl_attr = NULL_TREE;
6432 /* Keep track of what sort of function is being processed
6433 so that we can warn about default return values, or explicit
6434 return values which do not match prescribed defaults. */
6435 special_function_kind sfk = sfk_none;
6437 tree dname = NULL_TREE;
6438 tree ctor_return_type = NULL_TREE;
6439 enum overload_flags flags = NO_SPECIAL;
6440 cp_cv_quals quals = TYPE_UNQUALIFIED;
6441 tree raises = NULL_TREE;
6442 int template_count = 0;
6443 tree returned_attrs = NULL_TREE;
6444 tree parms = NULL_TREE;
6445 const cp_declarator *id_declarator;
6446 /* The unqualified name of the declarator; either an
6447 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6448 tree unqualified_id;
6449 /* The class type, if any, in which this entity is located,
6450 or NULL_TREE if none. Note that this value may be different from
6451 the current class type; for example if an attempt is made to declare
6452 "A::f" inside "B", this value will be "A". */
6453 tree ctype = current_class_type;
6454 /* The NAMESPACE_DECL for the namespace in which this entity is
6455 located. If an unqualified name is used to declare the entity,
6456 this value will be NULL_TREE, even if the entity is located at
6458 tree in_namespace = NULL_TREE;
6460 cp_storage_class storage_class;
6461 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6462 bool type_was_error_mark_node = false;
6464 signed_p = declspecs->specs[(int)ds_signed];
6465 unsigned_p = declspecs->specs[(int)ds_unsigned];
6466 short_p = declspecs->specs[(int)ds_short];
6467 long_p = declspecs->specs[(int)ds_long];
6468 thread_p = declspecs->specs[(int)ds_thread];
6470 if (decl_context == FUNCDEF)
6471 funcdef_flag = 1, decl_context = NORMAL;
6472 else if (decl_context == MEMFUNCDEF)
6473 funcdef_flag = -1, decl_context = FIELD;
6474 else if (decl_context == BITFIELD)
6475 bitfield = 1, decl_context = FIELD;
6477 /* Look inside a declarator for the name being declared
6478 and get it as a string, for an error message. */
6479 for (id_declarator = declarator;
6481 id_declarator = id_declarator->declarator)
6483 if (id_declarator->kind != cdk_id)
6484 innermost_code = id_declarator->kind;
6486 switch (id_declarator->kind)
6489 if (id_declarator->declarator
6490 && id_declarator->declarator->kind == cdk_id)
6492 sfk = id_declarator->declarator->u.id.sfk;
6493 if (sfk == sfk_destructor)
6500 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6501 tree decl = id_declarator->u.id.unqualified_name;
6504 if (qualifying_scope)
6506 if (TYPE_P (qualifying_scope))
6508 ctype = qualifying_scope;
6509 if (innermost_code != cdk_function
6510 && current_class_type
6511 && !UNIQUELY_DERIVED_FROM_P (ctype,
6512 current_class_type))
6514 error ("type %qT is not derived from type %qT",
6515 ctype, current_class_type);
6516 return error_mark_node;
6519 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6520 in_namespace = qualifying_scope;
6522 if (TREE_CODE (decl) == BASELINK)
6523 decl = BASELINK_FUNCTIONS (decl);
6524 if (decl == error_mark_node)
6525 return error_mark_node;
6526 switch (TREE_CODE (decl))
6532 if (innermost_code != cdk_function)
6534 error ("declaration of %qD as non-function", decl);
6535 return error_mark_node;
6537 else if (!qualifying_scope
6538 && !(current_class_type && at_class_scope_p ()))
6540 error ("declaration of %qD as non-member", decl);
6541 return error_mark_node;
6544 type = TREE_OPERAND (decl, 0);
6545 name = IDENTIFIER_POINTER (constructor_name (type));
6549 case TEMPLATE_ID_EXPR:
6551 tree fns = TREE_OPERAND (decl, 0);
6554 if (TREE_CODE (dname) == COMPONENT_REF)
6555 dname = TREE_OPERAND (dname, 1);
6556 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6558 gcc_assert (is_overloaded_fn (dname));
6559 dname = DECL_NAME (get_first_fn (dname));
6564 case IDENTIFIER_NODE:
6565 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6568 if (C_IS_RESERVED_WORD (dname))
6570 error ("declarator-id missing; using reserved word %qD",
6572 name = IDENTIFIER_POINTER (dname);
6574 else if (!IDENTIFIER_TYPENAME_P (dname))
6575 name = IDENTIFIER_POINTER (dname);
6578 gcc_assert (flags == NO_SPECIAL);
6579 flags = TYPENAME_FLAG;
6580 ctor_return_type = TREE_TYPE (dname);
6581 sfk = sfk_conversion;
6582 if (is_typename_at_global_scope (dname))
6583 name = IDENTIFIER_POINTER (dname);
6585 name = "<invalid operator>";
6590 dname = constructor_name (TREE_TYPE (decl));
6591 name = IDENTIFIER_POINTER (dname);
6612 if (id_declarator->kind == cdk_id)
6616 /* A function definition's declarator must have the form of
6617 a function declarator. */
6619 if (funcdef_flag && innermost_code != cdk_function)
6622 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6623 && innermost_code != cdk_function
6624 && ! (ctype && !declspecs->any_specifiers_p))
6626 error ("declaration of %qD as non-function", dname);
6627 return error_mark_node;
6630 /* Anything declared one level down from the top level
6631 must be one of the parameters of a function
6632 (because the body is at least two levels down). */
6634 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6635 by not allowing C++ class definitions to specify their parameters
6636 with xdecls (must be spec.d in the parmlist).
6638 Since we now wait to push a class scope until we are sure that
6639 we are in a legitimate method context, we must set oldcname
6640 explicitly (since current_class_name is not yet alive).
6642 We also want to avoid calling this a PARM if it is in a namespace. */
6644 if (decl_context == NORMAL && !toplevel_bindings_p ())
6646 struct cp_binding_level *b = current_binding_level;
6647 current_binding_level = b->level_chain;
6648 if (current_binding_level != 0 && toplevel_bindings_p ())
6649 decl_context = PARM;
6650 current_binding_level = b;
6654 name = decl_context == PARM ? "parameter" : "type name";
6656 /* If there were multiple types specified in the decl-specifier-seq,
6657 issue an error message. */
6658 if (declspecs->multiple_types_p)
6659 error ("two or more data types in declaration of %qs", name);
6660 /* Extract the basic type from the decl-specifier-seq. */
6661 type = declspecs->type;
6662 if (type == error_mark_node)
6665 type_was_error_mark_node = true;
6667 /* If the entire declaration is itself tagged as deprecated then
6668 suppress reports of deprecated items. */
6669 if (type && TREE_DEPRECATED (type)
6670 && deprecated_state != DEPRECATED_SUPPRESS)
6671 warn_deprecated_use (type);
6672 if (type && TREE_CODE (type) == TYPE_DECL)
6674 typedef_decl = type;
6675 type = TREE_TYPE (typedef_decl);
6677 /* No type at all: default to `int', and set DEFAULTED_INT
6678 because it was not a user-defined typedef. */
6679 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
6681 /* These imply 'int'. */
6682 type = integer_type_node;
6686 explicit_int = declspecs->explicit_int_p;
6687 explicit_char = declspecs->explicit_char_p;
6689 /* Check for repeated decl-specifiers. */
6690 for (ds = ds_first; ds != ds_last; ++ds)
6692 unsigned count = declspecs->specs[(int)ds];
6695 /* The "long" specifier is a special case because of
6700 error ("%<long long long%> is too long for GCC");
6701 else if (pedantic && !in_system_header && warn_long_long)
6702 pedwarn ("ISO C++ does not support %<long long%>");
6706 else if (declspecs->specs[(int)ds] > 1)
6708 static const char *const decl_spec_names[] = {
6724 error ("duplicate %qs", decl_spec_names[(int)ds]);
6729 /* See the code below that used this. */
6731 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6733 typedef_type = type;
6736 if (sfk != sfk_conversion)
6737 ctor_return_type = ctype;
6739 if (sfk != sfk_none)
6740 type = check_special_function_return_type (sfk, type,
6742 else if (type == NULL_TREE)
6748 /* We handle `main' specially here, because 'main () { }' is so
6749 common. With no options, it is allowed. With -Wreturn-type,
6750 it is a warning. It is only an error with -pedantic-errors. */
6751 is_main = (funcdef_flag
6752 && dname && MAIN_NAME_P (dname)
6753 && ctype == NULL_TREE
6754 && in_namespace == NULL_TREE
6755 && current_namespace == global_namespace);
6757 if (type_was_error_mark_node)
6758 /* We've already issued an error, don't complain more. */;
6759 else if (in_system_header || flag_ms_extensions)
6760 /* Allow it, sigh. */;
6761 else if (pedantic || ! is_main)
6762 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6763 else if (warn_return_type)
6764 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6766 type = integer_type_node;
6771 /* Now process the modifiers that were specified
6772 and check for invalid combinations. */
6774 /* Long double is a special combination. */
6775 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6778 type = build_qualified_type (long_double_type_node,
6779 cp_type_quals (type));
6782 /* Check all other uses of type modifiers. */
6784 if (unsigned_p || signed_p || long_p || short_p)
6788 if (TREE_CODE (type) == REAL_TYPE)
6789 error ("short, signed or unsigned invalid for %qs", name);
6790 else if (TREE_CODE (type) != INTEGER_TYPE)
6791 error ("long, short, signed or unsigned invalid for %qs", name);
6792 else if (long_p && short_p)
6793 error ("long and short specified together for %qs", name);
6794 else if ((long_p || short_p) && explicit_char)
6795 error ("long or short specified with char for %qs", name);
6796 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6797 error ("long or short specified with floating type for %qs", name);
6798 else if (signed_p && unsigned_p)
6799 error ("signed and unsigned given together for %qs", name);
6803 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6805 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
6807 if (flag_pedantic_errors)
6812 /* Discard the type modifiers if they are invalid. */
6823 /* Decide whether an integer type is signed or not.
6824 Optionally treat bitfields as signed by default. */
6828 It is implementation-defined whether a plain (neither
6829 explicitly signed or unsigned) char, short, int, or long
6830 bit-field is signed or unsigned.
6832 Naturally, we extend this to long long as well. Note that
6833 this does not include wchar_t. */
6834 || (bitfield && !flag_signed_bitfields
6836 /* A typedef for plain `int' without `signed' can be
6837 controlled just like plain `int', but a typedef for
6838 `signed int' cannot be so controlled. */
6840 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
6841 && (TREE_CODE (type) == INTEGER_TYPE
6842 || TREE_CODE (type) == CHAR_TYPE)
6843 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
6846 type = long_long_unsigned_type_node;
6848 type = long_unsigned_type_node;
6850 type = short_unsigned_type_node;
6851 else if (type == char_type_node)
6852 type = unsigned_char_type_node;
6853 else if (typedef_decl)
6854 type = c_common_unsigned_type (type);
6856 type = unsigned_type_node;
6858 else if (signed_p && type == char_type_node)
6859 type = signed_char_type_node;
6861 type = long_long_integer_type_node;
6863 type = long_integer_type_node;
6865 type = short_integer_type_node;
6867 if (declspecs->specs[(int)ds_complex])
6869 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
6870 error ("complex invalid for %qs", name);
6871 /* If we just have "complex", it is equivalent to
6872 "complex double", but if any modifiers at all are specified it is
6873 the complex form of TYPE. E.g, "complex short" is
6874 "complex short int". */
6876 else if (defaulted_int && ! longlong
6877 && ! (long_p || short_p || signed_p || unsigned_p))
6878 type = complex_double_type_node;
6879 else if (type == integer_type_node)
6880 type = complex_integer_type_node;
6881 else if (type == float_type_node)
6882 type = complex_float_type_node;
6883 else if (type == double_type_node)
6884 type = complex_double_type_node;
6885 else if (type == long_double_type_node)
6886 type = complex_long_double_type_node;
6888 type = build_complex_type (type);
6891 type_quals = TYPE_UNQUALIFIED;
6892 if (declspecs->specs[(int)ds_const])
6893 type_quals |= TYPE_QUAL_CONST;
6894 if (declspecs->specs[(int)ds_volatile])
6895 type_quals |= TYPE_QUAL_VOLATILE;
6896 if (declspecs->specs[(int)ds_restrict])
6897 type_quals |= TYPE_QUAL_RESTRICT;
6898 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
6899 error ("qualifiers are not allowed on declaration of %<operator %T%>",
6902 if (TREE_CODE (type) == FUNCTION_TYPE
6903 && type_quals != TYPE_UNQUALIFIED)
6905 /* This was an error in C++98 (cv-qualifiers cannot be added to
6906 a function type), but DR 295 makes the code well-formed by
6907 dropping the extra qualifiers. */
6910 tree bad_type = build_qualified_type (type, type_quals);
6911 pedwarn ("ignoring %qV qualifiers added to function type %qT",
6914 type_quals = TYPE_UNQUALIFIED;
6916 type_quals |= cp_type_quals (type);
6917 type = cp_build_qualified_type_real
6918 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
6919 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
6920 /* We might have ignored or rejected some of the qualifiers. */
6921 type_quals = cp_type_quals (type);
6924 inlinep = !! declspecs->specs[(int)ds_inline];
6925 virtualp = !! declspecs->specs[(int)ds_virtual];
6926 explicitp = !! declspecs->specs[(int)ds_explicit];
6928 storage_class = declspecs->storage_class;
6929 if (storage_class == sc_static)
6930 staticp = 1 + (decl_context == FIELD);
6932 if (virtualp && staticp == 2)
6934 error ("member %qD cannot be declared both virtual and static", dname);
6937 friendp = !! declspecs->specs[(int)ds_friend];
6939 if (dependant_name && !friendp)
6941 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
6942 return void_type_node;
6945 /* Issue errors about use of storage classes for parameters. */
6946 if (decl_context == PARM)
6948 if (declspecs->specs[(int)ds_typedef])
6949 error ("typedef declaration invalid in parameter declaration");
6950 else if (storage_class == sc_static
6951 || storage_class == sc_extern
6953 error ("storage class specifiers invalid in parameter declarations");
6956 /* Give error if `virtual' is used outside of class declaration. */
6958 && (current_class_name == NULL_TREE || decl_context != FIELD))
6960 error ("virtual outside class declaration");
6964 /* Static anonymous unions are dealt with here. */
6965 if (staticp && decl_context == TYPENAME
6967 && ANON_AGGR_TYPE_P (declspecs->type))
6968 decl_context = FIELD;
6970 /* Warn about storage classes that are invalid for certain
6971 kinds of declarations (parameters, typenames, etc.). */
6972 if (declspecs->multiple_storage_classes_p)
6973 error ("multiple storage classes in declaration of %qs", name);
6976 && storage_class != sc_extern
6977 && storage_class != sc_static)
6978 || declspecs->specs[(int)ds_typedef]))
6980 error ("multiple storage classes in declaration of %qs", name);
6983 else if (decl_context != NORMAL
6984 && ((storage_class != sc_none
6985 && storage_class != sc_mutable)
6988 if ((decl_context == PARM || decl_context == CATCHPARM)
6989 && (storage_class == sc_register
6990 || storage_class == sc_auto))
6992 else if (declspecs->specs[(int)ds_typedef])
6994 else if (decl_context == FIELD
6995 /* C++ allows static class elements. */
6996 && storage_class == sc_static)
6997 /* C++ also allows inlines and signed and unsigned elements,
6998 but in those cases we don't come in here. */
7002 if (decl_context == FIELD)
7003 error ("storage class specified for %qs", name);
7006 if (decl_context == PARM || decl_context == CATCHPARM)
7007 error ("storage class specified for parameter %qs", name);
7009 error ("storage class specified for typename");
7011 if (storage_class == sc_register
7012 || storage_class == sc_auto
7013 || storage_class == sc_extern
7015 storage_class = sc_none;
7018 else if (storage_class == sc_extern && initialized
7021 if (toplevel_bindings_p ())
7023 /* It's common practice (and completely valid) to have a const
7024 be initialized and declared extern. */
7025 if (!(type_quals & TYPE_QUAL_CONST))
7026 warning (0, "%qs initialized and declared %<extern%>", name);
7029 error ("%qs has both %<extern%> and initializer", name);
7031 else if (storage_class == sc_extern && funcdef_flag
7032 && ! toplevel_bindings_p ())
7033 error ("nested function %qs declared %<extern%>", name);
7034 else if (toplevel_bindings_p ())
7036 if (storage_class == sc_auto)
7037 error ("top-level declaration of %qs specifies %<auto%>", name);
7040 && storage_class != sc_extern
7041 && storage_class != sc_static)
7043 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7048 if (storage_class && friendp)
7049 error ("storage class specifiers invalid in friend function declarations");
7052 unqualified_id = NULL_TREE;
7055 unqualified_id = id_declarator->u.id.unqualified_name;
7056 if (TREE_CODE (unqualified_id) == BASELINK)
7057 unqualified_id = BASELINK_FUNCTIONS (unqualified_id);
7058 switch (TREE_CODE (unqualified_id))
7062 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7067 = constructor_name (TREE_TYPE (unqualified_id));
7070 case IDENTIFIER_NODE:
7071 case TEMPLATE_ID_EXPR:
7079 /* Determine the type of the entity declared by recurring on the
7081 for (; declarator; declarator = declarator->declarator)
7083 const cp_declarator *inner_declarator;
7086 if (type == error_mark_node)
7087 return error_mark_node;
7089 attrs = declarator->attributes;
7095 if (declarator == NULL || declarator->kind == cdk_id)
7096 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7097 if (declarator->kind == cdk_function)
7098 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7099 if (declarator->kind == cdk_array)
7100 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7101 returned_attrs = decl_attributes (&type,
7102 chainon (returned_attrs, attrs),
7106 if (declarator->kind == cdk_id)
7109 inner_declarator = declarator->declarator;
7111 switch (declarator->kind)
7114 type = create_array_type_for_decl (dname, type,
7115 declarator->u.array.bounds);
7123 /* Declaring a function type.
7124 Make sure we have a valid type for the function to return. */
7126 /* We now know that the TYPE_QUALS don't apply to the
7127 decl, but to its return type. */
7128 type_quals = TYPE_UNQUALIFIED;
7130 /* Warn about some types functions can't return. */
7132 if (TREE_CODE (type) == FUNCTION_TYPE)
7134 error ("%qs declared as function returning a function", name);
7135 type = integer_type_node;
7137 if (TREE_CODE (type) == ARRAY_TYPE)
7139 error ("%qs declared as function returning an array", name);
7140 type = integer_type_node;
7143 /* Pick up type qualifiers which should be applied to `this'. */
7144 quals = declarator->u.function.qualifiers;
7146 /* Pick up the exception specifications. */
7147 raises = declarator->u.function.exception_specification;
7149 /* Say it's a definition only for the CALL_EXPR
7150 closest to the identifier. */
7151 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7153 if (ctype == NULL_TREE
7154 && decl_context == FIELD
7156 && (friendp == 0 || dname == current_class_name))
7157 ctype = current_class_type;
7159 if (ctype && sfk == sfk_conversion)
7160 TYPE_HAS_CONVERSION (ctype) = 1;
7161 if (ctype && (sfk == sfk_constructor
7162 || sfk == sfk_destructor))
7164 /* We are within a class's scope. If our declarator name
7165 is the same as the class name, and we are defining
7166 a function, then it is a constructor/destructor, and
7167 therefore returns a void type. */
7169 if (flags == DTOR_FLAG)
7171 /* ISO C++ 12.4/2. A destructor may not be
7172 declared const or volatile. A destructor may
7175 error ("destructor cannot be static member function");
7178 error ("destructors may not be cv-qualified");
7179 quals = TYPE_UNQUALIFIED;
7181 if (decl_context == FIELD)
7183 if (! member_function_or_else (ctype,
7186 return void_type_node;
7189 else /* It's a constructor. */
7193 /* ISO C++ 12.1. A constructor may not be
7194 declared const or volatile. A constructor may
7195 not be virtual. A constructor may not be
7198 error ("constructor cannot be static member function");
7201 pedwarn ("constructors cannot be declared virtual");
7206 error ("constructors may not be cv-qualified");
7207 quals = TYPE_UNQUALIFIED;
7209 if (decl_context == FIELD)
7211 if (! member_function_or_else (ctype,
7214 return void_type_node;
7215 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7216 if (sfk != sfk_constructor)
7220 if (decl_context == FIELD)
7226 error ("can't initialize friend function %qs", name);
7229 /* Cannot be both friend and virtual. */
7230 error ("virtual functions cannot be friends");
7233 if (decl_context == NORMAL)
7234 error ("friend declaration not in class definition");
7235 if (current_function_decl && funcdef_flag)
7236 error ("can't define friend function %qs in a local "
7241 arg_types = grokparms (declarator->u.function.parameters,
7244 if (inner_declarator
7245 && inner_declarator->kind == cdk_id
7246 && inner_declarator->u.id.sfk == sfk_destructor
7247 && arg_types != void_list_node)
7249 error ("destructors may not have parameters");
7250 arg_types = void_list_node;
7254 type = build_function_type (type, arg_types);
7255 type = cp_build_qualified_type (type, quals);
7262 /* Filter out pointers-to-references and references-to-references.
7263 We can get these if a TYPE_DECL is used. */
7265 if (TREE_CODE (type) == REFERENCE_TYPE)
7267 error (declarator->kind == cdk_reference
7268 ? "cannot declare reference to %q#T"
7269 : "cannot declare pointer to %q#T", type);
7270 type = TREE_TYPE (type);
7272 else if (VOID_TYPE_P (type))
7274 if (declarator->kind == cdk_reference)
7275 error ("cannot declare reference to %q#T", type);
7276 else if (declarator->kind == cdk_ptrmem)
7277 error ("cannot declare pointer to %q#T member", type);
7280 /* We now know that the TYPE_QUALS don't apply to the decl,
7281 but to the target of the pointer. */
7282 type_quals = TYPE_UNQUALIFIED;
7284 if (declarator->kind == cdk_ptrmem
7285 && (TREE_CODE (type) == FUNCTION_TYPE
7286 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7290 /* If the type is a FUNCTION_TYPE, pick up the
7291 qualifiers from that function type. No other
7292 qualifiers may be supplied. */
7293 if (TREE_CODE (type) == FUNCTION_TYPE)
7294 quals = cp_type_quals (type);
7296 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7297 grok_method_quals (declarator->u.pointer.class_type,
7299 type = TREE_TYPE (dummy);
7300 quals = TYPE_UNQUALIFIED;
7303 if (declarator->kind == cdk_reference)
7305 if (!VOID_TYPE_P (type))
7306 type = build_reference_type (type);
7308 else if (TREE_CODE (type) == METHOD_TYPE)
7309 type = build_ptrmemfunc_type (build_pointer_type (type));
7310 else if (declarator->kind == cdk_ptrmem)
7312 /* We might have parsed a namespace as the class type. */
7313 if (TREE_CODE (declarator->u.pointer.class_type)
7316 error ("%qD is a namespace",
7317 declarator->u.pointer.class_type);
7318 type = build_pointer_type (type);
7320 else if (declarator->u.pointer.class_type == error_mark_node)
7321 /* We will already have complained. */
7322 type = error_mark_node;
7324 type = build_ptrmem_type (declarator->u.pointer.class_type,
7328 type = build_pointer_type (type);
7330 /* Process a list of type modifier keywords (such as
7331 const or volatile) that were given inside the `*' or `&'. */
7333 if (declarator->u.pointer.qualifiers)
7336 = cp_build_qualified_type (type,
7337 declarator->u.pointer.qualifiers);
7338 type_quals = cp_type_quals (type);
7351 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7352 && TREE_CODE (type) != FUNCTION_TYPE
7353 && TREE_CODE (type) != METHOD_TYPE)
7355 error ("template-id %qD used as a declarator",
7357 unqualified_id = dname;
7360 /* If DECLARATOR is non-NULL, we know it is a cdk_id declarator;
7361 otherwise, we would not have exited the loop above. */
7363 && declarator->u.id.qualifying_scope
7364 && TYPE_P (declarator->u.id.qualifying_scope))
7368 ctype = declarator->u.id.qualifying_scope;
7369 ctype = TYPE_MAIN_VARIANT (ctype);
7371 while (t != NULL_TREE && CLASS_TYPE_P (t))
7373 /* You're supposed to have one `template <...>' for every
7374 template class, but you don't need one for a full
7375 specialization. For example:
7377 template <class T> struct S{};
7378 template <> struct S<int> { void f(); };
7379 void S<int>::f () {}
7381 is correct; there shouldn't be a `template <>' for the
7382 definition of `S<int>::f'. */
7383 if (CLASSTYPE_TEMPLATE_INFO (t)
7384 && (CLASSTYPE_TEMPLATE_INSTANTIATION (t)
7385 || uses_template_parms (CLASSTYPE_TI_ARGS (t)))
7386 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7387 template_count += 1;
7389 t = TYPE_MAIN_DECL (t);
7390 t = DECL_CONTEXT (t);
7393 if (ctype == current_class_type)
7399 Is this ill-formed? */
7402 pedwarn ("extra qualification %<%T::%> on member %qs ignored",
7405 else if (TREE_CODE (type) == FUNCTION_TYPE)
7407 tree sname = declarator->u.id.unqualified_name;
7409 if (TREE_CODE (sname) == IDENTIFIER_NODE
7410 && NEW_DELETE_OPNAME_P (sname))
7411 /* Overloaded operator new and operator delete
7412 are always static functions. */
7414 else if (current_class_type == NULL_TREE || friendp)
7416 = build_method_type_directly (ctype,
7418 TYPE_ARG_TYPES (type));
7421 error ("cannot declare member function %<%T::%s%> within %<%T%>",
7422 ctype, name, current_class_type);
7423 return error_mark_node;
7426 else if (declspecs->specs[(int)ds_typedef]
7427 || COMPLETE_TYPE_P (complete_type (ctype)))
7429 /* Have to move this code elsewhere in this function.
7430 this code is used for i.e., typedef int A::M; M *pm;
7432 It is? How? jason 10/2/94 */
7434 if (current_class_type)
7436 error ("cannot declare member %<%T::%s%> within %qT",
7437 ctype, name, current_class_type);
7438 return void_type_node;
7443 cxx_incomplete_type_error (NULL_TREE, ctype);
7444 return error_mark_node;
7451 *attrlist = chainon (returned_attrs, *attrlist);
7453 attrlist = &returned_attrs;
7456 /* Now TYPE has the actual type. */
7458 /* Did array size calculations overflow? */
7460 if (TREE_CODE (type) == ARRAY_TYPE
7461 && COMPLETE_TYPE_P (type)
7462 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
7463 && TREE_OVERFLOW (TYPE_SIZE (type)))
7465 error ("size of array %qs is too large", name);
7466 /* If we proceed with the array type as it is, we'll eventually
7467 crash in tree_low_cst(). */
7468 type = error_mark_node;
7471 if ((decl_context == FIELD || decl_context == PARM)
7472 && !processing_template_decl
7473 && variably_modified_type_p (type, NULL_TREE))
7475 if (decl_context == FIELD)
7476 error ("data member may not have variably modified type %qT", type);
7478 error ("parameter may not have variably modified type %qT", type);
7479 type = error_mark_node;
7482 if (explicitp == 1 || (explicitp && friendp))
7484 /* [dcl.fct.spec] The explicit specifier shall only be used in
7485 declarations of constructors within a class definition. */
7486 error ("only declarations of constructors can be %<explicit%>");
7490 if (storage_class == sc_mutable)
7492 if (decl_context != FIELD || friendp)
7494 error ("non-member %qs cannot be declared %<mutable%>", name);
7495 storage_class = sc_none;
7497 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7499 error ("non-object member %qs cannot be declared %<mutable%>", name);
7500 storage_class = sc_none;
7502 else if (TREE_CODE (type) == FUNCTION_TYPE
7503 || TREE_CODE (type) == METHOD_TYPE)
7505 error ("function %qs cannot be declared %<mutable%>", name);
7506 storage_class = sc_none;
7510 error ("static %qs cannot be declared %<mutable%>", name);
7511 storage_class = sc_none;
7513 else if (type_quals & TYPE_QUAL_CONST)
7515 error ("const %qs cannot be declared %<mutable%>", name);
7516 storage_class = sc_none;
7520 /* If this is declaring a typedef name, return a TYPE_DECL. */
7521 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7525 /* Note that the grammar rejects storage classes
7526 in typenames, fields or parameters. */
7527 if (current_lang_name == lang_name_java)
7528 TYPE_FOR_JAVA (type) = 1;
7530 if (decl_context == FIELD)
7531 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7533 decl = build_decl (TYPE_DECL, unqualified_id, type);
7534 if (id_declarator && declarator->u.id.qualifying_scope)
7535 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7537 if (decl_context != FIELD)
7539 if (!current_function_decl)
7540 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7541 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7542 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7543 (current_function_decl)))
7544 /* The TYPE_DECL is "abstract" because there will be
7545 clones of this constructor/destructor, and there will
7546 be copies of this TYPE_DECL generated in those
7548 DECL_ABSTRACT (decl) = 1;
7550 else if (constructor_name_p (unqualified_id, current_class_type))
7551 pedwarn ("ISO C++ forbids nested type %qD with same name "
7552 "as enclosing class",
7555 /* If the user declares "typedef struct {...} foo" then the
7556 struct will have an anonymous name. Fill that name in now.
7557 Nothing can refer to it, so nothing needs know about the name
7559 if (type != error_mark_node
7562 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7563 && TYPE_ANONYMOUS_P (type)
7564 /* Don't do this if there are attributes. */
7565 && (!attrlist || !*attrlist)
7566 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7568 tree oldname = TYPE_NAME (type);
7571 /* Replace the anonymous name with the real name everywhere. */
7572 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7573 if (TYPE_NAME (t) == oldname)
7574 TYPE_NAME (t) = decl;
7576 if (TYPE_LANG_SPECIFIC (type))
7577 TYPE_WAS_ANONYMOUS (type) = 1;
7579 /* If this is a typedef within a template class, the nested
7580 type is a (non-primary) template. The name for the
7581 template needs updating as well. */
7582 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7583 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7584 = TYPE_IDENTIFIER (type);
7586 /* FIXME remangle member functions; member functions of a
7587 type with external linkage have external linkage. */
7592 if (ctype == NULL_TREE)
7594 if (TREE_CODE (type) == METHOD_TYPE)
7595 ctype = TYPE_METHOD_BASETYPE (type);
7596 /* Any qualifiers on a function type typedef have
7597 already been dealt with. */
7598 else if (TREE_CODE (type) == FUNCTION_TYPE)
7599 quals = TYPE_UNQUALIFIED;
7601 if (ctype != NULL_TREE)
7602 grok_method_quals (ctype, decl, quals);
7606 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7607 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7609 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7610 inlinep, friendp, raises != NULL_TREE);
7615 /* Detect the case of an array type of unspecified size
7616 which came, as such, direct from a typedef name.
7617 We must copy the type, so that the array's domain can be
7618 individually set by the object's initializer. */
7620 if (type && typedef_type
7621 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7622 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7623 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7625 /* Detect where we're using a typedef of function type to declare a
7626 function. PARMS will not be set, so we must create it now. */
7628 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7630 tree decls = NULL_TREE;
7633 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7635 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7637 TREE_CHAIN (decl) = decls;
7641 parms = nreverse (decls);
7643 if (decl_context != TYPENAME)
7645 /* A cv-qualifier-seq shall only be part of the function type
7646 for a non-static member function. [8.3.5/4 dcl.fct] */
7647 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7648 && (current_class_type == NULL_TREE || staticp) )
7650 error ("qualified function types cannot be used to declare %s functions",
7651 (staticp? "static member" : "free"));
7652 type = TYPE_MAIN_VARIANT (type);
7655 /* The qualifiers on the function type become the qualifiers on
7656 the non-static member function. */
7657 quals |= cp_type_quals (type);
7661 /* If this is a type name (such as, in a cast or sizeof),
7662 compute the type and return it now. */
7664 if (decl_context == TYPENAME)
7666 /* Note that the grammar rejects storage classes
7667 in typenames, fields or parameters. */
7668 if (type_quals != TYPE_UNQUALIFIED)
7669 type_quals = TYPE_UNQUALIFIED;
7671 /* Special case: "friend class foo" looks like a TYPENAME context. */
7674 if (type_quals != TYPE_UNQUALIFIED)
7676 error ("type qualifiers specified for friend class declaration");
7677 type_quals = TYPE_UNQUALIFIED;
7681 error ("%<inline%> specified for friend class declaration");
7687 /* Don't allow friend declaration without a class-key. */
7688 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7689 pedwarn ("template parameters cannot be friends");
7690 else if (TREE_CODE (type) == TYPENAME_TYPE)
7691 pedwarn ("friend declaration requires class-key, "
7692 "i.e. %<friend class %T::%D%>",
7693 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7695 pedwarn ("friend declaration requires class-key, "
7696 "i.e. %<friend %#T%>",
7700 /* Only try to do this stuff if we didn't already give up. */
7701 if (type != integer_type_node)
7703 /* A friendly class? */
7704 if (current_class_type)
7705 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7708 error ("trying to make class %qT a friend of global scope",
7711 type = void_type_node;
7716 if (ctype == NULL_TREE)
7718 if (TREE_CODE (type) != METHOD_TYPE)
7719 error ("invalid qualifiers on non-member function type");
7721 ctype = TYPE_METHOD_BASETYPE (type);
7725 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7726 grok_method_quals (ctype, dummy, quals);
7727 type = TREE_TYPE (dummy);
7733 else if (unqualified_id == NULL_TREE && decl_context != PARM
7734 && decl_context != CATCHPARM
7735 && TREE_CODE (type) != UNION_TYPE
7738 error ("abstract declarator %qT used as declaration", type);
7739 return error_mark_node;
7742 /* Only functions may be declared using an operator-function-id. */
7744 && IDENTIFIER_OPNAME_P (unqualified_id)
7745 && TREE_CODE (type) != FUNCTION_TYPE
7746 && TREE_CODE (type) != METHOD_TYPE)
7748 error ("declaration of %qD as non-function", unqualified_id);
7749 return error_mark_node;
7752 /* We don't check parameter types here because we can emit a better
7753 error message later. */
7754 if (decl_context != PARM)
7755 type = check_var_type (unqualified_id, type);
7757 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7758 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7760 if (decl_context == PARM || decl_context == CATCHPARM)
7762 if (ctype || in_namespace)
7763 error ("cannot use %<::%> in parameter declaration");
7765 /* A parameter declared as an array of T is really a pointer to T.
7766 One declared as a function is really a pointer to a function.
7767 One declared as a member is really a pointer to member. */
7769 if (TREE_CODE (type) == ARRAY_TYPE)
7771 /* Transfer const-ness of array into that of type pointed to. */
7772 type = build_pointer_type (TREE_TYPE (type));
7773 type_quals = TYPE_UNQUALIFIED;
7775 else if (TREE_CODE (type) == FUNCTION_TYPE)
7776 type = build_pointer_type (type);
7782 if (decl_context == PARM)
7784 decl = cp_build_parm_decl (unqualified_id, type);
7786 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7787 inlinep, friendp, raises != NULL_TREE);
7789 else if (decl_context == FIELD)
7791 /* The C99 flexible array extension. */
7792 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7793 && TYPE_DOMAIN (type) == NULL_TREE)
7795 tree itype = compute_array_index_type (dname, integer_zero_node);
7796 type = build_cplus_array_type (TREE_TYPE (type), itype);
7799 if (type == error_mark_node)
7801 /* Happens when declaring arrays of sizes which
7802 are error_mark_node, for example. */
7805 else if (in_namespace && !friendp)
7807 /* Something like struct S { int N::j; }; */
7808 error ("invalid use of %<::%>");
7811 else if (TREE_CODE (type) == FUNCTION_TYPE)
7814 tree function_context;
7818 if (ctype == NULL_TREE)
7819 ctype = current_class_type;
7821 if (ctype == NULL_TREE)
7823 error ("can't make %qD into a method -- not in a class",
7825 return void_type_node;
7828 /* ``A union may [ ... ] not [ have ] virtual functions.''
7830 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
7832 error ("function %qD declared virtual inside a union",
7834 return void_type_node;
7837 if (NEW_DELETE_OPNAME_P (unqualified_id))
7841 error ("%qD cannot be declared virtual, since it "
7847 else if (staticp < 2)
7848 type = build_method_type_directly (ctype,
7850 TYPE_ARG_TYPES (type));
7853 /* Check that the name used for a destructor makes sense. */
7854 if (sfk == sfk_destructor
7855 && !same_type_p (TREE_OPERAND
7856 (id_declarator->u.id.unqualified_name, 0),
7859 error ("declaration of %qD as member of %qT",
7860 id_declarator->u.id.unqualified_name,
7862 return error_mark_node;
7865 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
7866 function_context = (ctype != NULL_TREE) ?
7867 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
7868 publicp = (! friendp || ! staticp)
7869 && function_context == NULL_TREE;
7870 decl = grokfndecl (ctype, type,
7871 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
7872 ? unqualified_id : dname,
7875 virtualp, flags, quals, raises,
7876 friendp ? -1 : 0, friendp, publicp, inlinep,
7878 funcdef_flag, template_count, in_namespace, attrlist);
7879 if (decl == NULL_TREE)
7882 /* This clobbers the attrs stored in `decl' from `attrlist'. */
7883 /* The decl and setting of decl_attr is also turned off. */
7884 decl = build_decl_attribute_variant (decl, decl_attr);
7887 /* [class.conv.ctor]
7889 A constructor declared without the function-specifier
7890 explicit that can be called with a single parameter
7891 specifies a conversion from the type of its first
7892 parameter to the type of its class. Such a constructor
7893 is called a converting constructor. */
7895 DECL_NONCONVERTING_P (decl) = 1;
7896 else if (DECL_CONSTRUCTOR_P (decl))
7898 /* The constructor can be called with exactly one
7899 parameter if there is at least one parameter, and
7900 any subsequent parameters have default arguments.
7901 Ignore any compiler-added parms. */
7902 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
7904 if (arg_types == void_list_node
7906 && TREE_CHAIN (arg_types)
7907 && TREE_CHAIN (arg_types) != void_list_node
7908 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
7909 DECL_NONCONVERTING_P (decl) = 1;
7912 else if (TREE_CODE (type) == METHOD_TYPE)
7914 /* We only get here for friend declarations of
7915 members of other classes. */
7916 /* All method decls are public, so tell grokfndecl to set
7917 TREE_PUBLIC, also. */
7918 decl = grokfndecl (ctype, type,
7919 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
7920 ? unqualified_id : dname,
7923 virtualp, flags, quals, raises,
7924 friendp ? -1 : 0, friendp, 1, 0, sfk,
7925 funcdef_flag, template_count, in_namespace,
7927 if (decl == NULL_TREE)
7930 else if (!staticp && !dependent_type_p (type)
7931 && !COMPLETE_TYPE_P (complete_type (type))
7932 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
7935 error ("field %qD has incomplete type", unqualified_id);
7937 error ("name %qT has incomplete type", type);
7939 /* If we're instantiating a template, tell them which
7940 instantiation made the field's type be incomplete. */
7941 if (current_class_type
7942 && TYPE_NAME (current_class_type)
7943 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
7945 && declspecs->type == type)
7946 error (" in instantiation of template %qT",
7947 current_class_type);
7949 type = error_mark_node;
7956 error ("%qE is neither function nor member function; "
7957 "cannot be declared friend", unqualified_id);
7965 /* Friends are treated specially. */
7966 if (ctype == current_class_type)
7967 warning (0, "member functions are implicitly friends of their class");
7968 else if (decl && DECL_NAME (decl))
7970 if (template_class_depth (current_class_type) == 0)
7972 decl = check_explicit_specialization
7973 (unqualified_id, decl, template_count,
7974 2 * (funcdef_flag != 0) + 4);
7975 if (decl == error_mark_node)
7976 return error_mark_node;
7979 decl = do_friend (ctype, unqualified_id, decl,
7980 *attrlist, flags, quals, funcdef_flag);
7984 return void_type_node;
7987 /* Structure field. It may not be a function, except for C++. */
7989 if (decl == NULL_TREE)
7995 /* An attempt is being made to initialize a non-static
7996 member. But, from [class.mem]:
7998 4 A member-declarator can contain a
7999 constant-initializer only if it declares a static
8000 member (_class.static_) of integral or enumeration
8001 type, see _class.static.data_.
8003 This used to be relatively common practice, but
8004 the rest of the compiler does not correctly
8005 handle the initialization unless the member is
8006 static so we make it static below. */
8007 pedwarn ("ISO C++ forbids initialization of member %qD",
8009 pedwarn ("making %qD static", unqualified_id);
8013 if (uses_template_parms (type))
8014 /* We'll check at instantiation time. */
8016 else if (check_static_variable_definition (unqualified_id,
8018 /* If we just return the declaration, crashes
8019 will sometimes occur. We therefore return
8020 void_type_node, as if this was a friend
8021 declaration, to cause callers to completely
8022 ignore this declaration. */
8023 return void_type_node;
8028 /* C++ allows static class members. All other work
8029 for this is done by grokfield. */
8030 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8031 set_linkage_for_static_data_member (decl);
8032 /* Even if there is an in-class initialization, DECL
8033 is considered undefined until an out-of-class
8034 definition is provided. */
8035 DECL_EXTERNAL (decl) = 1;
8039 decl = build_decl (FIELD_DECL, unqualified_id, type);
8040 DECL_NONADDRESSABLE_P (decl) = bitfield;
8041 if (storage_class == sc_mutable)
8043 DECL_MUTABLE_P (decl) = 1;
8044 storage_class = sc_none;
8048 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8049 inlinep, friendp, raises != NULL_TREE);
8052 else if (TREE_CODE (type) == FUNCTION_TYPE
8053 || TREE_CODE (type) == METHOD_TYPE)
8058 if (!unqualified_id)
8061 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8062 original_name = dname;
8064 original_name = unqualified_id;
8066 if (storage_class == sc_auto)
8067 error ("storage class %<auto%> invalid for function %qs", name);
8068 else if (storage_class == sc_register)
8069 error ("storage class %<register%> invalid for function %qs", name);
8071 error ("storage class %<__thread%> invalid for function %qs", name);
8073 /* Function declaration not at top level.
8074 Storage classes other than `extern' are not allowed
8075 and `extern' makes no difference. */
8076 if (! toplevel_bindings_p ()
8077 && (storage_class == sc_static
8078 || declspecs->specs[(int)ds_inline])
8081 if (storage_class == sc_static)
8082 pedwarn ("%<static%> specified invalid for function %qs "
8083 "declared out of global scope", name);
8085 pedwarn ("%<inline%> specifier invalid for function %qs "
8086 "declared out of global scope", name);
8089 if (ctype == NULL_TREE)
8093 error ("virtual non-class function %qs", name);
8097 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8098 && !NEW_DELETE_OPNAME_P (original_name))
8099 type = build_method_type_directly (ctype,
8101 TYPE_ARG_TYPES (type));
8103 /* Record presence of `static'. */
8104 publicp = (ctype != NULL_TREE
8105 || storage_class == sc_extern
8106 || storage_class != sc_static);
8108 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8109 virtualp, flags, quals, raises,
8111 publicp, inlinep, sfk, funcdef_flag,
8112 template_count, in_namespace, attrlist);
8113 if (decl == NULL_TREE)
8118 int invalid_static = 0;
8120 /* Don't allow a static member function in a class, and forbid
8121 declaring main to be static. */
8122 if (TREE_CODE (type) == METHOD_TYPE)
8124 pedwarn ("cannot declare member function %qD to have "
8125 "static linkage", decl);
8128 else if (current_function_decl)
8130 /* FIXME need arm citation */
8131 error ("cannot declare static function inside another function");
8138 storage_class = sc_none;
8144 /* It's a variable. */
8146 /* An uninitialized decl with `extern' is a reference. */
8147 decl = grokvardecl (type, unqualified_id,
8150 (type_quals & TYPE_QUAL_CONST) != 0,
8151 ctype ? ctype : in_namespace);
8152 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8153 inlinep, friendp, raises != NULL_TREE);
8157 DECL_CONTEXT (decl) = ctype;
8160 pedwarn ("%<static%> may not be used when defining "
8161 "(as opposed to declaring) a static data member");
8163 storage_class = sc_none;
8165 if (storage_class == sc_register && TREE_STATIC (decl))
8167 error ("static member %qD declared %<register%>", decl);
8168 storage_class = sc_none;
8170 if (storage_class == sc_extern && pedantic)
8172 pedwarn ("cannot explicitly declare member %q#D to have "
8175 storage_class = sc_none;
8180 /* Record `register' declaration for warnings on &
8181 and in case doing stupid register allocation. */
8183 if (storage_class == sc_register)
8184 DECL_REGISTER (decl) = 1;
8185 else if (storage_class == sc_extern)
8186 DECL_THIS_EXTERN (decl) = 1;
8187 else if (storage_class == sc_static)
8188 DECL_THIS_STATIC (decl) = 1;
8190 /* Record constancy and volatility. There's no need to do this
8191 when processing a template; we'll do this for the instantiated
8192 declaration based on the type of DECL. */
8193 if (!processing_template_decl)
8194 cp_apply_type_quals_to_decl (type_quals, decl);
8200 /* Subroutine of start_function. Ensure that each of the parameter
8201 types (as listed in PARMS) is complete, as is required for a
8202 function definition. */
8205 require_complete_types_for_parms (tree parms)
8207 for (; parms; parms = TREE_CHAIN (parms))
8209 if (dependent_type_p (TREE_TYPE (parms)))
8211 if (VOID_TYPE_P (TREE_TYPE (parms)))
8212 /* grokparms will have already issued an error. */
8213 TREE_TYPE (parms) = error_mark_node;
8214 else if (complete_type_or_else (TREE_TYPE (parms), parms))
8216 layout_decl (parms, 0);
8217 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8222 /* Returns nonzero if T is a local variable. */
8225 local_variable_p (tree t)
8227 if ((TREE_CODE (t) == VAR_DECL
8228 /* A VAR_DECL with a context that is a _TYPE is a static data
8230 && !TYPE_P (CP_DECL_CONTEXT (t))
8231 /* Any other non-local variable must be at namespace scope. */
8232 && !DECL_NAMESPACE_SCOPE_P (t))
8233 || (TREE_CODE (t) == PARM_DECL))
8239 /* Returns nonzero if T is an automatic local variable or a label.
8240 (These are the declarations that need to be remapped when the code
8241 containing them is duplicated.) */
8244 nonstatic_local_decl_p (tree t)
8246 return ((local_variable_p (t) && !TREE_STATIC (t))
8247 || TREE_CODE (t) == LABEL_DECL
8248 || TREE_CODE (t) == RESULT_DECL);
8251 /* Like local_variable_p, but suitable for use as a tree-walking
8255 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8256 void *data ATTRIBUTE_UNUSED)
8258 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8260 else if (TYPE_P (*tp))
8267 /* Check that ARG, which is a default-argument expression for a
8268 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8269 something goes wrong. DECL may also be a _TYPE node, rather than a
8270 DECL, if there is no DECL available. */
8273 check_default_argument (tree decl, tree arg)
8278 if (TREE_CODE (arg) == DEFAULT_ARG)
8279 /* We get a DEFAULT_ARG when looking at an in-class declaration
8280 with a default argument. Ignore the argument for now; we'll
8281 deal with it after the class is complete. */
8284 if (processing_template_decl || uses_template_parms (arg))
8285 /* We don't do anything checking until instantiation-time. Note
8286 that there may be uninstantiated arguments even for an
8287 instantiated function, since default arguments are not
8288 instantiated until they are needed. */
8297 decl_type = TREE_TYPE (decl);
8299 if (arg == error_mark_node
8300 || decl == error_mark_node
8301 || TREE_TYPE (arg) == error_mark_node
8302 || decl_type == error_mark_node)
8303 /* Something already went wrong. There's no need to check
8305 return error_mark_node;
8307 /* [dcl.fct.default]
8309 A default argument expression is implicitly converted to the
8311 if (!TREE_TYPE (arg)
8312 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg))
8315 error ("default argument for %q#D has type %qT",
8316 decl, TREE_TYPE (arg));
8318 error ("default argument for parameter of type %qT has type %qT",
8319 decl_type, TREE_TYPE (arg));
8321 return error_mark_node;
8324 /* [dcl.fct.default]
8326 Local variables shall not be used in default argument
8329 The keyword `this' shall not be used in a default argument of a
8331 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8335 error ("default argument %qE uses local variable %qD", arg, var);
8336 return error_mark_node;
8343 /* Decode the list of parameter types for a function type.
8344 Given the list of things declared inside the parens,
8345 return a list of types.
8347 If this parameter does not end with an ellipsis, we append
8350 *PARMS is set to the chain of PARM_DECLs created. */
8353 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8355 tree result = NULL_TREE;
8356 tree decls = NULL_TREE;
8357 int ellipsis = !first_parm || first_parm->ellipsis_p;
8358 cp_parameter_declarator *parm;
8361 for (parm = first_parm; parm != NULL; parm = parm->next)
8363 tree type = NULL_TREE;
8364 tree init = parm->default_argument;
8368 if (parm == no_parameters)
8371 attrs = parm->decl_specifiers.attributes;
8372 parm->decl_specifiers.attributes = NULL_TREE;
8373 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8374 PARM, init != NULL_TREE, &attrs);
8375 if (! decl || TREE_TYPE (decl) == error_mark_node)
8379 cplus_decl_attributes (&decl, attrs, 0);
8381 type = TREE_TYPE (decl);
8382 if (VOID_TYPE_P (type))
8384 if (same_type_p (type, void_type_node)
8385 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8386 /* this is a parmlist of `(void)', which is ok. */
8388 cxx_incomplete_type_error (decl, type);
8389 /* It's not a good idea to actually create parameters of
8390 type `void'; other parts of the compiler assume that a
8391 void type terminates the parameter list. */
8392 type = error_mark_node;
8393 TREE_TYPE (decl) = error_mark_node;
8396 if (type != error_mark_node)
8398 /* Top-level qualifiers on the parameters are
8399 ignored for function types. */
8400 type = cp_build_qualified_type (type, 0);
8401 if (TREE_CODE (type) == METHOD_TYPE)
8403 error ("parameter %qD invalidly declared method type", decl);
8404 type = build_pointer_type (type);
8405 TREE_TYPE (decl) = type;
8407 else if (abstract_virtuals_error (decl, type))
8408 any_error = 1; /* Seems like a good idea. */
8409 else if (POINTER_TYPE_P (type))
8411 /* [dcl.fct]/6, parameter types cannot contain pointers
8412 (references) to arrays of unknown bound. */
8413 tree t = TREE_TYPE (type);
8414 int ptr = TYPE_PTR_P (type);
8420 else if (TREE_CODE (t) != ARRAY_TYPE)
8422 else if (!TYPE_DOMAIN (t))
8426 if (TREE_CODE (t) == ARRAY_TYPE)
8427 error ("parameter %qD includes %s to array of unknown "
8429 decl, ptr ? "pointer" : "reference", t);
8432 if (!any_error && init)
8433 init = check_default_argument (decl, init);
8438 TREE_CHAIN (decl) = decls;
8440 result = tree_cons (init, type, result);
8442 decls = nreverse (decls);
8443 result = nreverse (result);
8445 result = chainon (result, void_list_node);
8452 /* D is a constructor or overloaded `operator='.
8454 Let T be the class in which D is declared. Then, this function
8457 -1 if D's is an ill-formed constructor or copy assignment operator
8458 whose first parameter is of type `T'.
8459 0 if D is not a copy constructor or copy assignment
8461 1 if D is a copy constructor or copy assignment operator whose
8462 first parameter is a reference to const qualified T.
8463 2 if D is a copy constructor or copy assignment operator whose
8464 first parameter is a reference to non-const qualified T.
8466 This function can be used as a predicate. Positive values indicate
8467 a copy constructor and nonzero values indicate a copy assignment
8477 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8479 if (DECL_TEMPLATE_INFO (d)
8480 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8481 /* Instantiations of template member functions are never copy
8482 functions. Note that member functions of templated classes are
8483 represented as template functions internally, and we must
8484 accept those as copy functions. */
8487 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8491 arg_type = TREE_VALUE (args);
8493 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8495 /* Pass by value copy assignment operator. */
8498 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8499 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8501 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8507 args = TREE_CHAIN (args);
8509 if (args && args != void_list_node && !TREE_PURPOSE (args))
8510 /* There are more non-optional args. */
8516 /* Remember any special properties of member function DECL. */
8518 void grok_special_member_properties (tree decl)
8520 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8521 ; /* Not special. */
8522 else if (DECL_CONSTRUCTOR_P (decl))
8524 int ctor = copy_fn_p (decl);
8530 A non-template constructor for class X is a copy
8531 constructor if its first parameter is of type X&, const
8532 X&, volatile X& or const volatile X&, and either there
8533 are no other parameters or else all other parameters have
8534 default arguments. */
8535 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8537 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8539 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8540 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8542 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8546 A non-template assignment operator for class X is a copy
8547 assignment operator if its parameter is of type X, X&, const
8548 X&, volatile X& or const volatile X&. */
8550 int assop = copy_fn_p (decl);
8554 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8556 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8561 /* Check a constructor DECL has the correct form. Complains
8562 if the class has a constructor of the form X(X). */
8565 grok_ctor_properties (tree ctype, tree decl)
8567 int ctor_parm = copy_fn_p (decl);
8573 A declaration of a constructor for a class X is ill-formed if
8574 its first parameter is of type (optionally cv-qualified) X
8575 and either there are no other parameters or else all other
8576 parameters have default arguments.
8578 We *don't* complain about member template instantiations that
8579 have this form, though; they can occur as we try to decide
8580 what constructor to use during overload resolution. Since
8581 overload resolution will never prefer such a constructor to
8582 the non-template copy constructor (which is either explicitly
8583 or implicitly defined), there's no need to worry about their
8584 existence. Theoretically, they should never even be
8585 instantiated, but that's hard to forestall. */
8586 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8594 /* An operator with this code is unary, but can also be binary. */
8597 ambi_op_p (enum tree_code code)
8599 return (code == INDIRECT_REF
8600 || code == ADDR_EXPR
8601 || code == UNARY_PLUS_EXPR
8602 || code == NEGATE_EXPR
8603 || code == PREINCREMENT_EXPR
8604 || code == PREDECREMENT_EXPR);
8607 /* An operator with this name can only be unary. */
8610 unary_op_p (enum tree_code code)
8612 return (code == TRUTH_NOT_EXPR
8613 || code == BIT_NOT_EXPR
8614 || code == COMPONENT_REF
8615 || code == TYPE_EXPR);
8618 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8619 errors are issued for invalid declarations. */
8622 grok_op_properties (tree decl, bool complain)
8624 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8626 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8627 tree name = DECL_NAME (decl);
8628 enum tree_code operator_code;
8632 /* Count the number of arguments. */
8633 for (argtype = argtypes, arity = 0;
8634 argtype && argtype != void_list_node;
8635 argtype = TREE_CHAIN (argtype))
8638 class_type = DECL_CONTEXT (decl);
8639 if (class_type && !CLASS_TYPE_P (class_type))
8640 class_type = NULL_TREE;
8642 if (DECL_CONV_FN_P (decl))
8643 operator_code = TYPE_EXPR;
8647 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8648 if (ansi_opname (CODE) == name) \
8650 operator_code = (CODE); \
8653 else if (ansi_assopname (CODE) == name) \
8655 operator_code = (CODE); \
8656 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8660 #include "operators.def"
8666 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8667 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8670 switch (operator_code)
8673 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
8677 TYPE_GETS_DELETE (class_type) |= 1;
8681 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
8684 case VEC_DELETE_EXPR:
8685 TYPE_GETS_DELETE (class_type) |= 2;
8692 /* [basic.std.dynamic.allocation]/1:
8694 A program is ill-formed if an allocation function is declared
8695 in a namespace scope other than global scope or declared static
8698 The same also holds true for deallocation functions. */
8699 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8700 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8702 if (DECL_NAMESPACE_SCOPE_P (decl))
8704 if (CP_DECL_CONTEXT (decl) != global_namespace)
8705 error ("%qD may not be declared within a namespace", decl);
8706 else if (!TREE_PUBLIC (decl))
8707 error ("%qD may not be declared as static", decl);
8711 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8712 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8713 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8714 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8717 /* An operator function must either be a non-static member function
8718 or have at least one parameter of a class, a reference to a class,
8719 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8720 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8722 if (operator_code == TYPE_EXPR
8723 || operator_code == CALL_EXPR
8724 || operator_code == COMPONENT_REF
8725 || operator_code == ARRAY_REF
8726 || operator_code == NOP_EXPR)
8728 error ("%qD must be a nonstatic member function", decl);
8735 if (DECL_STATIC_FUNCTION_P (decl))
8737 error ("%qD must be either a non-static member "
8738 "function or a non-member function", decl);
8742 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8744 tree arg = non_reference (TREE_VALUE (p));
8745 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8746 because these checks are performed even on
8747 template functions. */
8748 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8752 if (!p || p == void_list_node)
8757 error ("%qD must have an argument of class or "
8764 /* There are no restrictions on the arguments to an overloaded
8766 if (operator_code == CALL_EXPR)
8769 /* Warn about conversion operators that will never be used. */
8770 if (IDENTIFIER_TYPENAME_P (name)
8771 && ! DECL_TEMPLATE_INFO (decl)
8773 /* Warn only declaring the function; there is no need to
8774 warn again about out-of-class definitions. */
8775 && class_type == current_class_type)
8777 tree t = TREE_TYPE (name);
8778 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8779 const char *what = 0;
8782 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8784 if (TREE_CODE (t) == VOID_TYPE)
8786 else if (class_type)
8788 if (t == class_type)
8789 what = "the same type";
8790 /* Don't force t to be complete here. */
8791 else if (IS_AGGR_TYPE (t)
8792 && COMPLETE_TYPE_P (t)
8793 && DERIVED_FROM_P (t, class_type))
8794 what = "a base class";
8798 warning (0, "conversion to %s%s will never use a type "
8799 "conversion operator",
8800 ref ? "a reference to " : "", what);
8802 if (operator_code == COND_EXPR)
8805 error ("ISO C++ prohibits overloading operator ?:");
8807 else if (ambi_op_p (operator_code))
8810 /* We pick the one-argument operator codes by default, so
8811 we don't have to change anything. */
8813 else if (arity == 2)
8815 /* If we thought this was a unary operator, we now know
8816 it to be a binary operator. */
8817 switch (operator_code)
8820 operator_code = MULT_EXPR;
8824 operator_code = BIT_AND_EXPR;
8827 case UNARY_PLUS_EXPR:
8828 operator_code = PLUS_EXPR;
8832 operator_code = MINUS_EXPR;
8835 case PREINCREMENT_EXPR:
8836 operator_code = POSTINCREMENT_EXPR;
8839 case PREDECREMENT_EXPR:
8840 operator_code = POSTDECREMENT_EXPR;
8847 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8849 if ((operator_code == POSTINCREMENT_EXPR
8850 || operator_code == POSTDECREMENT_EXPR)
8851 && ! processing_template_decl
8852 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
8855 error ("postfix %qD must take %<int%> as its argument",
8859 ("postfix %qD must take %<int%> as its second argument",
8866 error ("%qD must take either zero or one argument", decl);
8868 error ("%qD must take either one or two arguments", decl);
8871 /* More Effective C++ rule 6. */
8873 && (operator_code == POSTINCREMENT_EXPR
8874 || operator_code == POSTDECREMENT_EXPR
8875 || operator_code == PREINCREMENT_EXPR
8876 || operator_code == PREDECREMENT_EXPR))
8878 tree arg = TREE_VALUE (argtypes);
8879 tree ret = TREE_TYPE (TREE_TYPE (decl));
8880 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
8881 arg = TREE_TYPE (arg);
8882 arg = TYPE_MAIN_VARIANT (arg);
8883 if (operator_code == PREINCREMENT_EXPR
8884 || operator_code == PREDECREMENT_EXPR)
8886 if (TREE_CODE (ret) != REFERENCE_TYPE
8887 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
8889 warning (0, "prefix %qD should return %qT", decl,
8890 build_reference_type (arg));
8894 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
8895 warning (0, "postfix %qD should return %qT", decl, arg);
8899 else if (unary_op_p (operator_code))
8904 error ("%qD must take %<void%>", decl);
8906 error ("%qD must take exactly one argument", decl);
8909 else /* if (binary_op_p (operator_code)) */
8914 error ("%qD must take exactly one argument", decl);
8916 error ("%qD must take exactly two arguments", decl);
8919 /* More Effective C++ rule 7. */
8921 && (operator_code == TRUTH_ANDIF_EXPR
8922 || operator_code == TRUTH_ORIF_EXPR
8923 || operator_code == COMPOUND_EXPR))
8924 warning (0, "user-defined %qD always evaluates both arguments",
8928 /* Effective C++ rule 23. */
8931 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
8932 && (operator_code == PLUS_EXPR
8933 || operator_code == MINUS_EXPR
8934 || operator_code == TRUNC_DIV_EXPR
8935 || operator_code == MULT_EXPR
8936 || operator_code == TRUNC_MOD_EXPR)
8937 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
8938 warning (0, "%qD should return by value", decl);
8941 for (; argtypes && argtypes != void_list_node;
8942 argtypes = TREE_CHAIN (argtypes))
8943 if (TREE_PURPOSE (argtypes))
8945 TREE_PURPOSE (argtypes) = NULL_TREE;
8946 if (operator_code == POSTINCREMENT_EXPR
8947 || operator_code == POSTDECREMENT_EXPR)
8950 pedwarn ("%qD cannot have default arguments", decl);
8953 error ("%qD cannot have default arguments", decl);
8960 /* Return a string giving the keyword associate with CODE. */
8963 tag_name (enum tag_types code)
8982 /* Name lookup in an elaborated-type-specifier (after the keyword
8983 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
8984 elaborated-type-specifier is invalid, issue a diagnostic and return
8985 error_mark_node; otherwise, return the *_TYPE to which it referred.
8986 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
8989 check_elaborated_type_specifier (enum tag_types tag_code,
8991 bool allow_template_p)
8997 struct S { struct S *p; };
8999 name lookup will find the TYPE_DECL for the implicit "S::S"
9000 typedef. Adjust for that here. */
9001 if (DECL_SELF_REFERENCE_P (decl))
9002 decl = TYPE_NAME (TREE_TYPE (decl));
9004 type = TREE_TYPE (decl);
9006 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9007 is false for this case as well. */
9008 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9010 error ("using template type parameter %qT after %qs",
9011 type, tag_name (tag_code));
9012 return error_mark_node;
9016 If the identifier resolves to a typedef-name or a template
9017 type-parameter, the elaborated-type-specifier is ill-formed.
9019 In other words, the only legitimate declaration to use in the
9020 elaborated type specifier is the implicit typedef created when
9021 the type is declared. */
9022 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9023 && tag_code != typename_type)
9025 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9026 cp_error_at ("%qD has a previous declaration here", decl);
9027 return error_mark_node;
9029 else if (TREE_CODE (type) != RECORD_TYPE
9030 && TREE_CODE (type) != UNION_TYPE
9031 && tag_code != enum_type
9032 && tag_code != typename_type)
9034 error ("%qT referred to as %qs", type, tag_name (tag_code));
9035 cp_error_at ("%qT has a previous declaration here", type);
9036 return error_mark_node;
9038 else if (TREE_CODE (type) != ENUMERAL_TYPE
9039 && tag_code == enum_type
9040 && tag_code != typename_type)
9042 error ("%qT referred to as enum", type);
9043 cp_error_at ("%qT has a previous declaration here", type);
9044 return error_mark_node;
9046 else if (!allow_template_p
9047 && TREE_CODE (type) == RECORD_TYPE
9048 && CLASSTYPE_IS_TEMPLATE (type))
9050 /* If a class template appears as elaborated type specifier
9051 without a template header such as:
9053 template <class T> class C {};
9054 void f(class C); // No template header here
9056 then the required template argument is missing. */
9057 error ("template argument required for %<%s %T%>",
9058 tag_name (tag_code),
9059 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9060 return error_mark_node;
9066 /* Lookup NAME in elaborate type specifier in scope according to
9067 SCOPE and issue diagnostics if necessary.
9068 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9069 found, and ERROR_MARK_NODE for type error. */
9072 lookup_and_check_tag (enum tag_types tag_code, tree name,
9073 tag_scope scope, bool template_header_p)
9077 if (scope == ts_global)
9079 /* First try ordinary name lookup, ignoring hidden class name
9080 injected via friend declaration. */
9081 decl = lookup_name (name, 2);
9082 /* If that fails, the name will be placed in the smallest
9083 non-class, non-function-prototype scope according to 3.3.1/5.
9084 We may already have a hidden name declared as friend in this
9085 scope. So lookup again but not ignoring hidden name.
9086 If we find one, that name will be made visible rather than
9087 creating a new tag. */
9089 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9092 decl = lookup_type_scope (name, scope);
9094 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9095 decl = DECL_TEMPLATE_RESULT (decl);
9097 if (decl && TREE_CODE (decl) == TYPE_DECL)
9099 /* Look for invalid nested type:
9103 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9105 error ("%qD has the same name as the class in which it is "
9108 return error_mark_node;
9111 /* Two cases we need to consider when deciding if a class
9112 template is allowed as an elaborated type specifier:
9113 1. It is a self reference to its own class.
9114 2. It comes with a template header.
9118 template <class T> class C {
9119 class C *c1; // DECL_SELF_REFERENCE_P is true
9122 template <class U> class C; // template_header_p is true
9123 template <class T> class C<T>::D {
9124 class C *c2; // DECL_SELF_REFERENCE_P is true
9127 t = check_elaborated_type_specifier (tag_code,
9130 | DECL_SELF_REFERENCE_P (decl));
9137 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9138 Define the tag as a forward-reference if it is not defined.
9140 If a declaration is given, process it here, and report an error if
9141 multiple declarations are not identical.
9143 SCOPE is TS_CURRENT when this is also a definition. Only look in
9144 the current frame for the name (since C++ allows new names in any
9145 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9146 declaration. Only look beginning from the current scope outward up
9147 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9149 TEMPLATE_HEADER_P is true when this declaration is preceded by
9150 a set of template parameters. */
9153 xref_tag (enum tag_types tag_code, tree name,
9154 tag_scope scope, bool template_header_p)
9156 enum tree_code code;
9158 tree context = NULL_TREE;
9160 timevar_push (TV_NAME_LOOKUP);
9162 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9174 code = ENUMERAL_TYPE;
9180 /* In case of anonymous name, xref_tag is only called to
9181 make type node and push name. Name lookup is not required. */
9182 if (ANON_AGGRNAME_P (name))
9185 t = lookup_and_check_tag (tag_code, name,
9186 scope, template_header_p);
9188 if (t == error_mark_node)
9189 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9191 if (scope != ts_current && t && current_class_type
9192 && template_class_depth (current_class_type)
9193 && template_header_p)
9195 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9196 definition of this tag. Since, in addition, we are currently
9197 processing a (member) template declaration of a template
9198 class, we must be very careful; consider:
9205 { template <class V>
9206 friend struct S1; };
9208 Here, the S2::S1 declaration should not be confused with the
9209 outer declaration. In particular, the inner version should
9210 have a template parameter of level 2, not level 1. This
9211 would be particularly important if the member declaration
9214 template <class V = U> friend struct S1;
9216 say, when we should tsubst into `U' when instantiating
9217 S2. On the other hand, when presented with:
9227 we must find the inner binding eventually. We
9228 accomplish this by making sure that the new type we
9229 create to represent this declaration has the right
9231 context = TYPE_CONTEXT (t);
9237 /* If no such tag is yet defined, create a forward-reference node
9238 and record it as the "definition".
9239 When a real declaration of this type is found,
9240 the forward-reference will be altered into a real type. */
9241 if (code == ENUMERAL_TYPE)
9243 error ("use of enum %q#D without previous declaration", name);
9244 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9248 t = make_aggr_type (code);
9249 TYPE_CONTEXT (t) = context;
9250 t = pushtag (name, t, scope);
9255 if (template_header_p && IS_AGGR_TYPE (t))
9256 redeclare_class_template (t, current_template_parms);
9257 else if (!processing_template_decl
9259 && CLASSTYPE_IS_TEMPLATE (t))
9261 error ("redeclaration of %qT as a non-template", t);
9262 t = error_mark_node;
9265 /* Make injected friend class visible. */
9266 if (scope != ts_within_enclosing_non_class
9267 && hidden_name_p (TYPE_NAME (t)))
9269 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9270 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9272 if (TYPE_TEMPLATE_INFO (t))
9274 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9275 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9280 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9284 xref_tag_from_type (tree old, tree id, tag_scope scope)
9286 enum tag_types tag_kind;
9288 if (TREE_CODE (old) == RECORD_TYPE)
9289 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9291 tag_kind = union_type;
9293 if (id == NULL_TREE)
9294 id = TYPE_IDENTIFIER (old);
9296 return xref_tag (tag_kind, id, scope, false);
9299 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9300 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9301 access_* node, and the TREE_VALUE is the type of the base-class.
9302 Non-NULL TREE_TYPE indicates virtual inheritance. */
9305 xref_basetypes (tree ref, tree base_list)
9308 tree binfo, base_binfo;
9309 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9310 unsigned max_bases = 0; /* Maximum direct bases. */
9312 tree default_access;
9313 tree igo_prev; /* Track Inheritance Graph Order. */
9315 if (ref == error_mark_node)
9318 /* The base of a derived class is private by default, all others are
9320 default_access = (TREE_CODE (ref) == RECORD_TYPE
9321 && CLASSTYPE_DECLARED_CLASS (ref)
9322 ? access_private_node : access_public_node);
9324 /* First, make sure that any templates in base-classes are
9325 instantiated. This ensures that if we call ourselves recursively
9326 we do not get confused about which classes are marked and which
9331 tree basetype = TREE_VALUE (*basep);
9333 if (!(processing_template_decl && uses_template_parms (basetype))
9334 && !complete_type_or_else (basetype, NULL))
9335 /* An incomplete type. Remove it from the list. */
9336 *basep = TREE_CHAIN (*basep);
9340 if (TREE_TYPE (*basep))
9342 if (CLASS_TYPE_P (basetype))
9343 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9344 basep = &TREE_CHAIN (*basep);
9348 TYPE_MARKED_P (ref) = 1;
9350 /* The binfo slot should be empty, unless this is an (ill-formed)
9352 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9353 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9355 binfo = make_tree_binfo (max_bases);
9357 TYPE_BINFO (ref) = binfo;
9358 BINFO_OFFSET (binfo) = size_zero_node;
9359 BINFO_TYPE (binfo) = ref;
9363 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9364 /* An aggregate cannot have baseclasses. */
9365 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9367 if (TREE_CODE (ref) == UNION_TYPE)
9368 error ("derived union %qT invalid", ref);
9373 if (TYPE_FOR_JAVA (ref))
9374 error ("Java class %qT cannot have multiple bases", ref);
9379 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9381 if (TYPE_FOR_JAVA (ref))
9382 error ("Java class %qT cannot have virtual bases", ref);
9385 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9387 tree access = TREE_PURPOSE (base_list);
9388 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9389 tree basetype = TREE_VALUE (base_list);
9391 if (access == access_default_node)
9392 access = default_access;
9394 if (TREE_CODE (basetype) == TYPE_DECL)
9395 basetype = TREE_TYPE (basetype);
9396 if (TREE_CODE (basetype) != RECORD_TYPE
9397 && TREE_CODE (basetype) != TYPENAME_TYPE
9398 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9399 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9401 error ("base type %qT fails to be a struct or class type",
9406 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9407 TYPE_FOR_JAVA (ref) = 1;
9409 base_binfo = NULL_TREE;
9410 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9412 base_binfo = TYPE_BINFO (basetype);
9413 /* The original basetype could have been a typedef'd type. */
9414 basetype = BINFO_TYPE (base_binfo);
9416 /* Inherit flags from the base. */
9417 TYPE_HAS_NEW_OPERATOR (ref)
9418 |= TYPE_HAS_NEW_OPERATOR (basetype);
9419 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9420 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9421 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9422 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9423 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9424 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9425 CLASSTYPE_REPEATED_BASE_P (ref)
9426 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9429 /* We must do this test after we've seen through a typedef
9431 if (TYPE_MARKED_P (basetype))
9433 if (basetype == ref)
9434 error ("recursive type %qT undefined", basetype);
9436 error ("duplicate base type %qT invalid", basetype);
9439 TYPE_MARKED_P (basetype) = 1;
9441 base_binfo = copy_binfo (base_binfo, basetype, ref,
9442 &igo_prev, via_virtual);
9443 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9444 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9446 BINFO_BASE_APPEND (binfo, base_binfo);
9447 BINFO_BASE_ACCESS_APPEND (binfo, access);
9450 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9451 /* If we have space in the vbase vector, we must have shared at
9452 least one of them, and are therefore diamond shaped. */
9453 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9455 /* Unmark all the types. */
9456 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9457 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9458 TYPE_MARKED_P (ref) = 0;
9460 /* Now see if we have a repeated base type. */
9461 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9463 for (base_binfo = binfo; base_binfo;
9464 base_binfo = TREE_CHAIN (base_binfo))
9466 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9468 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9471 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9473 for (base_binfo = binfo; base_binfo;
9474 base_binfo = TREE_CHAIN (base_binfo))
9475 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9476 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9483 /* Begin compiling the definition of an enumeration type.
9485 Returns the type object, as yet incomplete.
9486 Also records info about it so that build_enumerator
9487 may be used to declare the individual values as they are read. */
9490 start_enum (tree name)
9494 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9496 /* If this is the real definition for a previous forward reference,
9497 fill in the contents in the same object that used to be the
9498 forward reference. */
9500 enumtype = lookup_and_check_tag (enum_type, name,
9501 /*tag_scope=*/ts_current,
9502 /*template_header_p=*/false);
9504 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9506 error ("multiple definition of %q#T", enumtype);
9507 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9508 /* Clear out TYPE_VALUES, and start again. */
9509 TYPE_VALUES (enumtype) = NULL_TREE;
9513 /* In case of error, make a dummy enum to allow parsing to
9515 if (enumtype == error_mark_node)
9516 name = make_anon_name ();
9518 enumtype = make_node (ENUMERAL_TYPE);
9519 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9525 /* After processing and defining all the values of an enumeration type,
9526 install their decls in the enumeration type and finish it off.
9527 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9530 finish_enum (tree enumtype)
9539 bool use_short_enum;
9543 integer_type_kind itk;
9544 tree underlying_type = NULL_TREE;
9546 /* We built up the VALUES in reverse order. */
9547 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9549 /* For an enum defined in a template, just set the type of the values;
9550 all further processing is postponed until the template is
9551 instantiated. We need to set the type so that tsubst of a CONST_DECL
9553 if (processing_template_decl)
9555 for (values = TYPE_VALUES (enumtype);
9557 values = TREE_CHAIN (values))
9558 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9559 if (at_function_scope_p ())
9560 add_stmt (build_min (TAG_DEFN, enumtype));
9564 /* Determine the minimum and maximum values of the enumerators. */
9565 if (TYPE_VALUES (enumtype))
9567 minnode = maxnode = NULL_TREE;
9569 for (values = TYPE_VALUES (enumtype);
9571 values = TREE_CHAIN (values))
9573 decl = TREE_VALUE (values);
9575 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9576 each enumerator has the type of its enumeration. Prior to the
9577 closing brace, the type of each enumerator is the type of its
9578 initializing value. */
9579 TREE_TYPE (decl) = enumtype;
9581 /* Update the minimum and maximum values, if appropriate. */
9582 value = DECL_INITIAL (decl);
9583 /* Figure out what the minimum and maximum values of the
9586 minnode = maxnode = value;
9587 else if (tree_int_cst_lt (maxnode, value))
9589 else if (tree_int_cst_lt (value, minnode))
9596 If the enumerator-list is empty, the underlying type is as if
9597 the enumeration had a single enumerator with value 0. */
9598 minnode = maxnode = integer_zero_node;
9600 /* Compute the number of bits require to represent all values of the
9601 enumeration. We must do this before the type of MINNODE and
9602 MAXNODE are transformed, since min_precision relies on the
9603 TREE_TYPE of the value it is passed. */
9604 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9605 lowprec = min_precision (minnode, unsignedp);
9606 highprec = min_precision (maxnode, unsignedp);
9607 precision = MAX (lowprec, highprec);
9609 /* Determine the underlying type of the enumeration.
9613 The underlying type of an enumeration is an integral type that
9614 can represent all the enumerator values defined in the
9615 enumeration. It is implementation-defined which integral type is
9616 used as the underlying type for an enumeration except that the
9617 underlying type shall not be larger than int unless the value of
9618 an enumerator cannot fit in an int or unsigned int.
9620 We use "int" or an "unsigned int" as the underlying type, even if
9621 a smaller integral type would work, unless the user has
9622 explicitly requested that we use the smallest possible type. The
9623 user can request that for all enumerations with a command line
9624 flag, or for just one enumeration with an attribute. */
9626 use_short_enum = flag_short_enums
9627 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9629 for (itk = (use_short_enum ? itk_char : itk_int);
9633 underlying_type = integer_types[itk];
9634 if (TYPE_PRECISION (underlying_type) >= precision
9635 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9638 if (itk == itk_none)
9642 IF no integral type can represent all the enumerator values, the
9643 enumeration is ill-formed. */
9644 error ("no integral type can represent all of the enumerator values "
9645 "for %qT", enumtype);
9646 precision = TYPE_PRECISION (long_long_integer_type_node);
9647 underlying_type = integer_types[itk_unsigned_long_long];
9650 /* Compute the minium and maximum values for the type.
9654 For an enumeration where emin is the smallest enumerator and emax
9655 is the largest, the values of the enumeration are the values of the
9656 underlying type in the range bmin to bmax, where bmin and bmax are,
9657 respectively, the smallest and largest values of the smallest bit-
9658 field that can store emin and emax. */
9660 /* The middle-end currently assumes that types with TYPE_PRECISION
9661 narrower than their underlying type are suitably zero or sign
9662 extended to fill their mode. g++ doesn't make these guarantees.
9663 Until the middle-end can represent such paradoxical types, we
9664 set the TYPE_PRECISION to the width of the underlying type. */
9665 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9667 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9671 The value of sizeof() applied to an enumeration type, an object
9672 of an enumeration type, or an enumerator, is the value of sizeof()
9673 applied to the underlying type. */
9674 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9675 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9676 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9677 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9678 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9679 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9681 /* Convert each of the enumerators to the type of the underlying
9682 type of the enumeration. */
9683 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9685 decl = TREE_VALUE (values);
9686 value = perform_implicit_conversion (underlying_type,
9687 DECL_INITIAL (decl));
9689 /* Do not clobber shared ints. */
9690 value = copy_node (value);
9692 TREE_TYPE (value) = enumtype;
9693 DECL_INITIAL (decl) = value;
9694 TREE_VALUE (values) = value;
9697 /* Fix up all variant types of this enum type. */
9698 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9700 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9701 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9702 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9703 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9704 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9705 TYPE_MODE (t) = TYPE_MODE (enumtype);
9706 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9707 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9708 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9709 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9712 /* Finish debugging output for this type. */
9713 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9716 /* Build and install a CONST_DECL for an enumeration constant of the
9717 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9718 Assignment of sequential values by default is handled here. */
9721 build_enumerator (tree name, tree value, tree enumtype)
9727 /* If the VALUE was erroneous, pretend it wasn't there; that will
9728 result in the enum being assigned the next value in sequence. */
9729 if (value == error_mark_node)
9732 /* Remove no-op casts from the value. */
9734 STRIP_TYPE_NOPS (value);
9736 if (! processing_template_decl)
9738 /* Validate and default VALUE. */
9739 if (value != NULL_TREE)
9741 value = integral_constant_value (value);
9743 if (TREE_CODE (value) == INTEGER_CST)
9745 value = perform_integral_promotions (value);
9746 constant_expression_warning (value);
9750 error ("enumerator value for %qD not integer constant", name);
9755 /* Default based on previous value. */
9756 if (value == NULL_TREE)
9758 if (TYPE_VALUES (enumtype))
9761 unsigned HOST_WIDE_INT lo;
9765 /* The next value is the previous value plus one. We can
9766 safely assume that the previous value is an INTEGER_CST.
9767 add_double doesn't know the type of the target expression,
9768 so we must check with int_fits_type_p as well. */
9769 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9770 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9771 TREE_INT_CST_HIGH (prev_value),
9773 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9774 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
9777 error ("overflow in enumeration values at %qD", name);
9780 value = integer_zero_node;
9783 /* Remove no-op casts from the value. */
9784 STRIP_TYPE_NOPS (value);
9787 /* C++ associates enums with global, function, or class declarations. */
9788 context = current_scope ();
9790 /* Build the actual enumeration constant. Note that the enumeration
9791 constants have the type of their initializers until the
9792 enumeration is complete:
9796 Following the closing brace of an enum-specifier, each enumer-
9797 ator has the type of its enumeration. Prior to the closing
9798 brace, the type of each enumerator is the type of its
9801 In finish_enum we will reset the type. Of course, if we're
9802 processing a template, there may be no value. */
9803 type = value ? TREE_TYPE (value) : NULL_TREE;
9805 if (context && context == current_class_type)
9806 /* This enum declaration is local to the class. We need the full
9807 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9808 decl = build_lang_decl (CONST_DECL, name, type);
9810 /* It's a global enum, or it's local to a function. (Note local to
9811 a function could mean local to a class method. */
9812 decl = build_decl (CONST_DECL, name, type);
9814 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
9815 TREE_CONSTANT (decl) = 1;
9816 TREE_INVARIANT (decl) = 1;
9817 TREE_READONLY (decl) = 1;
9818 DECL_INITIAL (decl) = value;
9820 if (context && context == current_class_type)
9821 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
9822 on the TYPE_FIELDS list for `S'. (That's so that you can say
9823 things like `S::i' later.) */
9824 finish_member_declaration (decl);
9828 /* Add this enumeration constant to the list for this type. */
9829 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
9833 /* We're defining DECL. Make sure that it's type is OK. */
9836 check_function_type (tree decl, tree current_function_parms)
9838 tree fntype = TREE_TYPE (decl);
9839 tree return_type = complete_type (TREE_TYPE (fntype));
9841 /* In a function definition, arg types must be complete. */
9842 require_complete_types_for_parms (current_function_parms);
9844 if (dependent_type_p (return_type))
9846 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
9848 error ("return type %q#T is incomplete", TREE_TYPE (fntype));
9850 /* Make it return void instead, but don't change the
9851 type of the DECL_RESULT, in case we have a named return value. */
9852 if (TREE_CODE (fntype) == METHOD_TYPE)
9854 tree ctype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype)));
9856 = build_method_type_directly (ctype,
9858 FUNCTION_ARG_CHAIN (decl));
9862 = build_function_type (void_type_node,
9863 TYPE_ARG_TYPES (TREE_TYPE (decl)));
9865 = build_exception_variant (fntype,
9866 TYPE_RAISES_EXCEPTIONS (fntype));
9869 abstract_virtuals_error (decl, TREE_TYPE (fntype));
9872 /* Create the FUNCTION_DECL for a function definition.
9873 DECLSPECS and DECLARATOR are the parts of the declaration;
9874 they describe the function's name and the type it returns,
9875 but twisted together in a fashion that parallels the syntax of C.
9877 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
9878 DECLARATOR is really the DECL for the function we are about to
9879 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
9880 indicating that the function is an inline defined in-class.
9882 This function creates a binding context for the function body
9883 as well as setting up the FUNCTION_DECL in current_function_decl.
9885 For C++, we must first check whether that datum makes any sense.
9886 For example, "class A local_a(1,2);" means that variable local_a
9887 is an aggregate of type A, which should have a constructor
9888 applied to it with the argument list [1, 2]. */
9891 start_preparsed_function (tree decl1, tree attrs, int flags)
9893 tree ctype = NULL_TREE;
9896 int doing_friend = 0;
9897 struct cp_binding_level *bl;
9898 tree current_function_parms;
9899 struct c_fileinfo *finfo
9900 = get_fileinfo (lbasename (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1))));
9903 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
9904 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
9906 fntype = TREE_TYPE (decl1);
9907 if (TREE_CODE (fntype) == METHOD_TYPE)
9908 ctype = TYPE_METHOD_BASETYPE (fntype);
9910 /* ISO C++ 11.4/5. A friend function defined in a class is in
9911 the (lexical) scope of the class in which it is defined. */
9912 if (!ctype && DECL_FRIEND_P (decl1))
9914 ctype = DECL_FRIEND_CONTEXT (decl1);
9916 /* CTYPE could be null here if we're dealing with a template;
9917 for example, `inline friend float foo()' inside a template
9918 will have no CTYPE set. */
9919 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
9925 if (DECL_DECLARED_INLINE_P (decl1)
9926 && lookup_attribute ("noinline", attrs))
9927 warning (0, "%Jinline function %qD given attribute noinline", decl1, decl1);
9929 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
9930 /* This is a constructor, we must ensure that any default args
9931 introduced by this definition are propagated to the clones
9932 now. The clones are used directly in overload resolution. */
9933 adjust_clone_args (decl1);
9935 /* Sometimes we don't notice that a function is a static member, and
9936 build a METHOD_TYPE for it. Fix that up now. */
9937 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
9938 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
9940 revert_static_member_fn (decl1);
9944 /* Set up current_class_type, and enter the scope of the class, if
9947 push_nested_class (ctype);
9948 else if (DECL_STATIC_FUNCTION_P (decl1))
9949 push_nested_class (DECL_CONTEXT (decl1));
9951 /* Now that we have entered the scope of the class, we must restore
9952 the bindings for any template parameters surrounding DECL1, if it
9953 is an inline member template. (Order is important; consider the
9954 case where a template parameter has the same name as a field of
9955 the class.) It is not until after this point that
9956 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
9957 if (flags & SF_INCLASS_INLINE)
9958 maybe_begin_member_template_processing (decl1);
9960 /* Effective C++ rule 15. */
9962 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
9963 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
9964 warning (0, "%<operator=%> should return a reference to %<*this%>");
9966 /* Make the init_value nonzero so pushdecl knows this is not tentative.
9967 error_mark_node is replaced below (in poplevel) with the BLOCK. */
9968 if (!DECL_INITIAL (decl1))
9969 DECL_INITIAL (decl1) = error_mark_node;
9971 /* This function exists in static storage.
9972 (This does not mean `static' in the C sense!) */
9973 TREE_STATIC (decl1) = 1;
9975 /* We must call push_template_decl after current_class_type is set
9976 up. (If we are processing inline definitions after exiting a
9977 class scope, current_class_type will be NULL_TREE until set above
9978 by push_nested_class.) */
9979 if (processing_template_decl)
9981 /* FIXME: Handle error_mark_node more gracefully. */
9982 tree newdecl1 = push_template_decl (decl1);
9983 if (newdecl1 != error_mark_node)
9987 /* We are now in the scope of the function being defined. */
9988 current_function_decl = decl1;
9990 /* Save the parm names or decls from this function's declarator
9991 where store_parm_decls will find them. */
9992 current_function_parms = DECL_ARGUMENTS (decl1);
9994 /* Make sure the parameter and return types are reasonable. When
9995 you declare a function, these types can be incomplete, but they
9996 must be complete when you define the function. */
9997 check_function_type (decl1, current_function_parms);
9999 /* Build the return declaration for the function. */
10000 restype = TREE_TYPE (fntype);
10001 /* Promote the value to int before returning it. */
10002 if (c_promoting_integer_type_p (restype))
10003 restype = type_promotes_to (restype);
10004 if (DECL_RESULT (decl1) == NULL_TREE)
10008 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10009 DECL_ARTIFICIAL (resdecl) = 1;
10010 DECL_IGNORED_P (resdecl) = 1;
10011 DECL_RESULT (decl1) = resdecl;
10013 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10016 /* Initialize RTL machinery. We cannot do this until
10017 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10018 even when processing a template; this is how we get
10019 CFUN set up, and our per-function variables initialized.
10020 FIXME factor out the non-RTL stuff. */
10021 bl = current_binding_level;
10022 allocate_struct_function (decl1);
10023 current_binding_level = bl;
10025 /* Even though we're inside a function body, we still don't want to
10026 call expand_expr to calculate the size of a variable-sized array.
10027 We haven't necessarily assigned RTL to all variables yet, so it's
10028 not safe to try to expand expressions involving them. */
10029 cfun->x_dont_save_pending_sizes_p = 1;
10031 /* Start the statement-tree, start the tree now. */
10032 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10034 /* Let the user know we're compiling this function. */
10035 announce_function (decl1);
10037 /* Record the decl so that the function name is defined.
10038 If we already have a decl for this name, and it is a FUNCTION_DECL,
10039 use the old decl. */
10040 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10042 /* A specialization is not used to guide overload resolution. */
10043 if (!DECL_FUNCTION_MEMBER_P (decl1)
10044 && !(DECL_USE_TEMPLATE (decl1) &&
10045 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10047 tree olddecl = pushdecl (decl1);
10049 if (olddecl == error_mark_node)
10050 /* If something went wrong when registering the declaration,
10051 use DECL1; we have to have a FUNCTION_DECL to use when
10052 parsing the body of the function. */
10055 /* Otherwise, OLDDECL is either a previous declaration of
10056 the same function or DECL1 itself. */
10061 /* We need to set the DECL_CONTEXT. */
10062 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10063 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10064 /* And make sure we have enough default args. */
10065 check_default_args (decl1);
10067 fntype = TREE_TYPE (decl1);
10070 /* Determine the ELF visibility attribute for the function. We must
10071 not do this before calling "pushdecl", as we must allow
10072 "duplicate_decls" to merge any attributes appropriately. */
10073 if (!DECL_CLONED_FUNCTION_P (decl1))
10074 determine_visibility (decl1);
10076 /* Reset these in case the call to pushdecl changed them. */
10077 current_function_decl = decl1;
10078 cfun->decl = decl1;
10080 /* If we are (erroneously) defining a function that we have already
10081 defined before, wipe out what we knew before. */
10082 if (!DECL_PENDING_INLINE_P (decl1))
10083 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10085 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10087 /* We know that this was set up by `grokclassfn'. We do not
10088 wait until `store_parm_decls', since evil parse errors may
10089 never get us to that point. Here we keep the consistency
10090 between `current_class_type' and `current_class_ptr'. */
10091 tree t = DECL_ARGUMENTS (decl1);
10093 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10094 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10096 cp_function_chain->x_current_class_ref
10097 = build_indirect_ref (t, NULL);
10098 cp_function_chain->x_current_class_ptr = t;
10100 /* Constructors and destructors need to know whether they're "in
10101 charge" of initializing virtual base classes. */
10102 t = TREE_CHAIN (t);
10103 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10105 current_in_charge_parm = t;
10106 t = TREE_CHAIN (t);
10108 if (DECL_HAS_VTT_PARM_P (decl1))
10110 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10111 current_vtt_parm = t;
10115 if (DECL_INTERFACE_KNOWN (decl1))
10117 tree ctx = decl_function_context (decl1);
10119 if (DECL_NOT_REALLY_EXTERN (decl1))
10120 DECL_EXTERNAL (decl1) = 0;
10122 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10123 && TREE_PUBLIC (ctx))
10124 /* This is a function in a local class in an extern inline
10126 comdat_linkage (decl1);
10128 /* If this function belongs to an interface, it is public.
10129 If it belongs to someone else's interface, it is also external.
10130 This only affects inlines and template instantiations. */
10131 else if (finfo->interface_unknown == 0
10132 && ! DECL_TEMPLATE_INSTANTIATION (decl1))
10134 if (DECL_DECLARED_INLINE_P (decl1)
10135 || DECL_TEMPLATE_INSTANTIATION (decl1)
10136 || processing_template_decl)
10138 DECL_EXTERNAL (decl1)
10139 = (finfo->interface_only
10140 || (DECL_DECLARED_INLINE_P (decl1)
10141 && ! flag_implement_inlines
10142 && !DECL_VINDEX (decl1)));
10144 /* For WIN32 we also want to put these in linkonce sections. */
10145 maybe_make_one_only (decl1);
10148 DECL_EXTERNAL (decl1) = 0;
10149 DECL_NOT_REALLY_EXTERN (decl1) = 0;
10150 DECL_INTERFACE_KNOWN (decl1) = 1;
10151 /* If this function is in an interface implemented in this file,
10152 make sure that the backend knows to emit this function
10154 if (!DECL_EXTERNAL (decl1))
10155 mark_needed (decl1);
10157 else if (finfo->interface_unknown && finfo->interface_only
10158 && ! DECL_TEMPLATE_INSTANTIATION (decl1))
10160 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10161 interface, we will have both finfo->interface_unknown and
10162 finfo->interface_only set. In that case, we don't want to
10163 use the normal heuristics because someone will supply a
10164 #pragma implementation elsewhere, and deducing it here would
10165 produce a conflict. */
10166 comdat_linkage (decl1);
10167 DECL_EXTERNAL (decl1) = 0;
10168 DECL_INTERFACE_KNOWN (decl1) = 1;
10169 DECL_DEFER_OUTPUT (decl1) = 1;
10173 /* This is a definition, not a reference.
10174 So clear DECL_EXTERNAL. */
10175 DECL_EXTERNAL (decl1) = 0;
10177 if ((DECL_DECLARED_INLINE_P (decl1)
10178 || DECL_TEMPLATE_INSTANTIATION (decl1))
10179 && ! DECL_INTERFACE_KNOWN (decl1)
10180 /* Don't try to defer nested functions for now. */
10181 && ! decl_function_context (decl1))
10182 DECL_DEFER_OUTPUT (decl1) = 1;
10184 DECL_INTERFACE_KNOWN (decl1) = 1;
10187 begin_scope (sk_function_parms, decl1);
10191 if (DECL_DESTRUCTOR_P (decl1)
10192 || (DECL_CONSTRUCTOR_P (decl1)
10193 && targetm.cxx.cdtor_returns_this ()))
10195 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10196 DECL_CONTEXT (cdtor_label) = current_function_decl;
10199 start_fname_decls ();
10201 store_parm_decls (current_function_parms);
10205 /* Like start_preparsed_function, except that instead of a
10206 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10208 Returns 1 on success. If the DECLARATOR is not suitable for a function
10209 (it defines a datum instead), we return 0, which tells
10210 yyparse to report a parse error. */
10213 start_function (cp_decl_specifier_seq *declspecs,
10214 const cp_declarator *declarator,
10219 if (have_extern_spec)
10221 declspecs->storage_class = sc_extern;
10222 /* This should only be done once on the outermost decl. */
10223 have_extern_spec = false;
10226 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10227 /* If the declarator is not suitable for a function definition,
10228 cause a syntax error. */
10229 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10232 /* If #pragma weak was used, mark the decl weak now. */
10233 if (global_scope_p (current_binding_level))
10234 maybe_apply_pragma_weak (decl1);
10236 if (DECL_MAIN_P (decl1))
10237 /* main must return int. grokfndecl should have corrected it
10238 (and issued a diagnostic) if the user got it wrong. */
10239 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10240 integer_type_node));
10242 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10247 /* Store the parameter declarations into the current function declaration.
10248 This is called after parsing the parameter declarations, before
10249 digesting the body of the function.
10251 Also install to binding contour return value identifier, if any. */
10254 store_parm_decls (tree current_function_parms)
10256 tree fndecl = current_function_decl;
10259 /* This is a chain of any other decls that came in among the parm
10260 declarations. If a parm is declared with enum {foo, bar} x;
10261 then CONST_DECLs for foo and bar are put here. */
10262 tree nonparms = NULL_TREE;
10264 if (current_function_parms)
10266 /* This case is when the function was defined with an ANSI prototype.
10267 The parms already have decls, so we need not do anything here
10268 except record them as in effect
10269 and complain if any redundant old-style parm decls were written. */
10271 tree specparms = current_function_parms;
10274 /* Must clear this because it might contain TYPE_DECLs declared
10276 current_binding_level->names = NULL;
10278 /* If we're doing semantic analysis, then we'll call pushdecl
10279 for each of these. We must do them in reverse order so that
10280 they end in the correct forward order. */
10281 specparms = nreverse (specparms);
10283 for (parm = specparms; parm; parm = next)
10285 next = TREE_CHAIN (parm);
10286 if (TREE_CODE (parm) == PARM_DECL)
10288 if (DECL_NAME (parm) == NULL_TREE
10289 || TREE_CODE (parm) != VOID_TYPE)
10292 error ("parameter %qD declared void", parm);
10296 /* If we find an enum constant or a type tag,
10297 put it aside for the moment. */
10298 TREE_CHAIN (parm) = NULL_TREE;
10299 nonparms = chainon (nonparms, parm);
10303 /* Get the decls in their original chain order and record in the
10304 function. This is all and only the PARM_DECLs that were
10305 pushed into scope by the loop above. */
10306 DECL_ARGUMENTS (fndecl) = getdecls ();
10309 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10311 /* Now store the final chain of decls for the arguments
10312 as the decl-chain of the current lexical scope.
10313 Put the enumerators in as well, at the front so that
10314 DECL_ARGUMENTS is not modified. */
10315 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10317 /* For a cloned function, we've already got all the code we need;
10318 there's no need to add any extra bits. */
10319 if (!DECL_CLONED_FUNCTION_P (fndecl))
10321 /* Do the starting of the exception specifications, if we have any. */
10322 if (flag_exceptions && !processing_template_decl
10323 && flag_enforce_eh_specs
10324 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10325 current_eh_spec_block = begin_eh_spec_block ();
10330 /* We have finished doing semantic analysis on DECL, but have not yet
10331 generated RTL for its body. Save away our current state, so that
10332 when we want to generate RTL later we know what to do. */
10335 save_function_data (tree decl)
10337 struct language_function *f;
10339 /* Save the language-specific per-function data so that we can
10340 get it back when we really expand this function. */
10341 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10344 f = GGC_NEW (struct language_function);
10345 memcpy (f, cp_function_chain, sizeof (struct language_function));
10346 DECL_SAVED_FUNCTION_DATA (decl) = f;
10348 /* Clear out the bits we don't need. */
10349 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10350 f->x_named_label_uses = NULL;
10351 f->bindings = NULL;
10352 f->x_local_names = NULL;
10356 /* Set the return value of the constructor (if present). */
10359 finish_constructor_body (void)
10364 if (targetm.cxx.cdtor_returns_this ())
10366 /* Any return from a constructor will end up here. */
10367 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10369 val = DECL_ARGUMENTS (current_function_decl);
10370 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10371 DECL_RESULT (current_function_decl), val);
10372 /* Return the address of the object. */
10373 exprstmt = build_stmt (RETURN_EXPR, val);
10374 add_stmt (exprstmt);
10378 /* Do all the processing for the beginning of a destructor; set up the
10379 vtable pointers and cleanups for bases and members. */
10382 begin_destructor_body (void)
10385 tree compound_stmt;
10387 /* If the dtor is empty, and we know there is not any possible
10388 way we could use any vtable entries, before they are possibly
10389 set by a base class dtor, we don't have to setup the vtables,
10390 as we know that any base class dtor will set up any vtables
10391 it needs. We avoid MI, because one base class dtor can do a
10392 virtual dispatch to an overridden function that would need to
10393 have a non-related vtable set up, we cannot avoid setting up
10394 vtables in that case. We could change this to see if there
10395 is just one vtable.
10397 ??? In the destructor for a class, the vtables are set
10398 appropriately for that class. There will be no non-related
10399 vtables. jason 2001-12-11. */
10400 if_stmt = begin_if_stmt ();
10402 /* If it is not safe to avoid setting up the vtables, then
10403 someone will change the condition to be boolean_true_node.
10404 (Actually, for now, we do not have code to set the condition
10405 appropriately, so we just assume that we always need to
10406 initialize the vtables.) */
10407 finish_if_stmt_cond (boolean_true_node, if_stmt);
10409 compound_stmt = begin_compound_stmt (0);
10411 /* Make all virtual function table pointers in non-virtual base
10412 classes point to CURRENT_CLASS_TYPE's virtual function
10414 initialize_vtbl_ptrs (current_class_ptr);
10416 finish_compound_stmt (compound_stmt);
10417 finish_then_clause (if_stmt);
10418 finish_if_stmt (if_stmt);
10420 /* And insert cleanups for our bases and members so that they
10421 will be properly destroyed if we throw. */
10422 push_base_cleanups ();
10425 /* At the end of every destructor we generate code to delete the object if
10426 necessary. Do that now. */
10429 finish_destructor_body (void)
10433 /* Any return from a destructor will end up here; that way all base
10434 and member cleanups will be run when the function returns. */
10435 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10437 /* In a virtual destructor, we must call delete. */
10438 if (DECL_VIRTUAL_P (current_function_decl))
10441 tree virtual_size = cxx_sizeof (current_class_type);
10445 At the point of definition of a virtual destructor (including
10446 an implicit definition), non-placement operator delete shall
10447 be looked up in the scope of the destructor's class and if
10448 found shall be accessible and unambiguous. */
10449 exprstmt = build_op_delete_call
10450 (DELETE_EXPR, current_class_ptr, virtual_size,
10451 /*global_p=*/false, NULL_TREE);
10453 if_stmt = begin_if_stmt ();
10454 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10455 current_in_charge_parm,
10458 finish_expr_stmt (exprstmt);
10459 finish_then_clause (if_stmt);
10460 finish_if_stmt (if_stmt);
10463 if (targetm.cxx.cdtor_returns_this ())
10467 val = DECL_ARGUMENTS (current_function_decl);
10468 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10469 DECL_RESULT (current_function_decl), val);
10470 /* Return the address of the object. */
10471 exprstmt = build_stmt (RETURN_EXPR, val);
10472 add_stmt (exprstmt);
10476 /* Do the necessary processing for the beginning of a function body, which
10477 in this case includes member-initializers, but not the catch clauses of
10478 a function-try-block. Currently, this means opening a binding level
10479 for the member-initializers (in a ctor) and member cleanups (in a dtor).
10480 In other functions, this isn't necessary, but it doesn't hurt. */
10483 begin_function_body (void)
10487 if (processing_template_decl)
10488 /* Do nothing now. */;
10490 /* Always keep the BLOCK node associated with the outermost pair of
10491 curly braces of a function. These are needed for correct
10492 operation of dwarfout.c. */
10493 keep_next_level (true);
10495 stmt = begin_compound_stmt (BCS_FN_BODY);
10497 if (processing_template_decl)
10498 /* Do nothing now. */;
10499 else if (DECL_DESTRUCTOR_P (current_function_decl))
10500 begin_destructor_body ();
10505 /* Do the processing for the end of a function body. Currently, this means
10506 closing out the cleanups for fully-constructed bases and members, and in
10507 the case of the destructor, deleting the object if desired. Again, this
10508 is only meaningful for [cd]tors, since they are the only functions where
10509 there is a significant distinction between the main body and any
10510 function catch clauses. Handling, say, main() return semantics here
10511 would be wrong, as flowing off the end of a function catch clause for
10512 main() would also need to return 0. */
10515 finish_function_body (tree compstmt)
10517 /* Close the block. */
10518 finish_compound_stmt (compstmt);
10520 if (processing_template_decl)
10521 /* Do nothing now. */;
10522 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10523 finish_constructor_body ();
10524 else if (DECL_DESTRUCTOR_P (current_function_decl))
10525 finish_destructor_body ();
10528 /* Finish up a function declaration and compile that function
10529 all the way to assembler language output. The free the storage
10530 for the function definition.
10532 FLAGS is a bitwise or of the following values:
10534 We just finished processing the body of an in-class inline
10535 function definition. (This processing will have taken place
10536 after the class definition is complete.) */
10539 finish_function (int flags)
10541 tree fndecl = current_function_decl;
10542 tree fntype, ctype = NULL_TREE;
10543 int inclass_inline = (flags & 2) != 0;
10546 /* When we get some parse errors, we can end up without a
10547 current_function_decl, so cope. */
10548 if (fndecl == NULL_TREE)
10549 return error_mark_node;
10551 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10552 && DECL_VIRTUAL_P (fndecl)
10553 && !processing_template_decl)
10555 tree fnclass = DECL_CONTEXT (fndecl);
10556 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10557 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10560 nested = function_depth > 1;
10561 fntype = TREE_TYPE (fndecl);
10563 /* TREE_READONLY (fndecl) = 1;
10564 This caused &foo to be of type ptr-to-const-function
10565 which then got a warning when stored in a ptr-to-function variable. */
10567 gcc_assert (building_stmt_tree ());
10569 /* For a cloned function, we've already got all the code we need;
10570 there's no need to add any extra bits. */
10571 if (!DECL_CLONED_FUNCTION_P (fndecl))
10573 if (DECL_MAIN_P (current_function_decl))
10577 /* Make it so that `main' always returns 0 by default (or
10580 stmt = finish_return_stmt (integer_one_node);
10582 stmt = finish_return_stmt (integer_zero_node);
10584 /* Hack. We don't want the middle-end to warn that this
10585 return is unreachable, so put the statement on the
10587 #ifdef USE_MAPPED_LOCATION
10588 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10590 annotate_with_file_line (stmt, input_filename, 0);
10594 /* Finish dealing with exception specifiers. */
10595 if (flag_exceptions && !processing_template_decl
10596 && flag_enforce_eh_specs
10597 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10598 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10599 (TREE_TYPE (current_function_decl)),
10600 current_eh_spec_block);
10603 /* If we're saving up tree structure, tie off the function now. */
10604 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10606 finish_fname_decls ();
10608 /* If this function can't throw any exceptions, remember that. */
10609 if (!processing_template_decl
10610 && !cp_function_chain->can_throw
10611 && !flag_non_call_exceptions)
10612 TREE_NOTHROW (fndecl) = 1;
10614 /* This must come after expand_function_end because cleanups might
10615 have declarations (from inline functions) that need to go into
10616 this function's blocks. */
10618 /* If the current binding level isn't the outermost binding level
10619 for this function, either there is a bug, or we have experienced
10620 syntax errors and the statement tree is malformed. */
10621 if (current_binding_level->kind != sk_function_parms)
10623 /* Make sure we have already experienced errors. */
10624 gcc_assert (errorcount);
10626 /* Throw away the broken statement tree and extra binding
10628 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10630 while (current_binding_level->kind != sk_function_parms)
10632 if (current_binding_level->kind == sk_class)
10633 pop_nested_class ();
10635 poplevel (0, 0, 0);
10638 poplevel (1, 0, 1);
10640 /* Statements should always be full-expressions at the outermost set
10641 of curly braces for a function. */
10642 gcc_assert (stmts_are_full_exprs_p ());
10644 /* Set up the named return value optimization, if we can. Candidate
10645 variables are selected in check_return_value. */
10646 if (current_function_return_value)
10648 tree r = current_function_return_value;
10651 if (r != error_mark_node
10652 /* This is only worth doing for fns that return in memory--and
10653 simpler, since we don't have to worry about promoted modes. */
10654 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10655 /* Only allow this for variables declared in the outer scope of
10656 the function so we know that their lifetime always ends with a
10657 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10658 we were to do this optimization in tree-ssa. */
10659 && (outer = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl)))
10660 /* Skip the artificial function body block. */
10661 && (outer = BLOCK_SUBBLOCKS (outer))
10662 && chain_member (r, BLOCK_VARS (outer)))
10663 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10665 current_function_return_value = NULL_TREE;
10668 /* Remember that we were in class scope. */
10669 if (current_class_name)
10670 ctype = current_class_type;
10672 /* Must mark the RESULT_DECL as being in this function. */
10673 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10675 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10676 to the FUNCTION_DECL node itself. */
10677 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10679 /* Save away current state, if appropriate. */
10680 if (!processing_template_decl)
10681 save_function_data (fndecl);
10683 /* Complain if there's just no return statement. */
10684 if (warn_return_type
10685 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10686 && !dependent_type_p (TREE_TYPE (fntype))
10687 && !current_function_returns_value && !current_function_returns_null
10688 /* Don't complain if we abort or throw. */
10689 && !current_function_returns_abnormally
10690 && !DECL_NAME (DECL_RESULT (fndecl))
10691 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10692 inline function, as we might never be compiled separately. */
10693 && (DECL_INLINE (fndecl) || processing_template_decl)
10694 /* Structor return values (if any) are set by the compiler. */
10695 && !DECL_CONSTRUCTOR_P (fndecl)
10696 && !DECL_DESTRUCTOR_P (fndecl))
10697 warning (0, "no return statement in function returning non-void");
10699 /* Store the end of the function, so that we get good line number
10700 info for the epilogue. */
10701 cfun->function_end_locus = input_location;
10703 /* Genericize before inlining. */
10704 if (!processing_template_decl)
10706 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10707 cp_genericize (fndecl);
10708 /* Clear out the bits we don't need. */
10709 f->x_current_class_ptr = NULL;
10710 f->x_current_class_ref = NULL;
10711 f->x_eh_spec_block = NULL;
10712 f->x_in_charge_parm = NULL;
10713 f->x_vtt_parm = NULL;
10714 f->x_return_value = NULL;
10715 f->bindings = NULL;
10717 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10718 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10720 /* Clear out the bits we don't need. */
10721 local_names = NULL;
10722 named_label_uses = NULL;
10724 /* We're leaving the context of this function, so zap cfun. It's still in
10725 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10727 current_function_decl = NULL;
10729 /* If this is an in-class inline definition, we may have to pop the
10730 bindings for the template parameters that we added in
10731 maybe_begin_member_template_processing when start_function was
10733 if (inclass_inline)
10734 maybe_end_member_template_processing ();
10736 /* Leave the scope of the class. */
10738 pop_nested_class ();
10744 /* Let the error reporting routines know that we're outside a
10745 function. For a nested function, this value is used in
10746 cxx_pop_function_context and then reset via pop_function_context. */
10747 current_function_decl = NULL_TREE;
10752 /* Create the FUNCTION_DECL for a function definition.
10753 DECLSPECS and DECLARATOR are the parts of the declaration;
10754 they describe the return type and the name of the function,
10755 but twisted together in a fashion that parallels the syntax of C.
10757 This function creates a binding context for the function body
10758 as well as setting up the FUNCTION_DECL in current_function_decl.
10760 Returns a FUNCTION_DECL on success.
10762 If the DECLARATOR is not suitable for a function (it defines a datum
10763 instead), we return 0, which tells yyparse to report a parse error.
10765 May return void_type_node indicating that this method is actually
10766 a friend. See grokfield for more details.
10768 Came here with a `.pushlevel' .
10770 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10771 CHANGES TO CODE IN `grokfield'. */
10774 start_method (cp_decl_specifier_seq *declspecs,
10775 const cp_declarator *declarator, tree attrlist)
10777 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10780 if (fndecl == error_mark_node)
10781 return error_mark_node;
10783 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10785 error ("invalid member function declaration");
10786 return error_mark_node;
10790 cplus_decl_attributes (&fndecl, attrlist, 0);
10792 /* Pass friends other than inline friend functions back. */
10793 if (fndecl == void_type_node)
10796 if (DECL_IN_AGGR_P (fndecl))
10798 if (DECL_CONTEXT (fndecl)
10799 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
10800 error ("%qD is already defined in class %qT", fndecl,
10801 DECL_CONTEXT (fndecl));
10802 return void_type_node;
10805 check_template_shadow (fndecl);
10807 DECL_DECLARED_INLINE_P (fndecl) = 1;
10808 if (flag_default_inline)
10809 DECL_INLINE (fndecl) = 1;
10811 /* We process method specializations in finish_struct_1. */
10812 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
10814 fndecl = push_template_decl (fndecl);
10815 if (fndecl == error_mark_node)
10819 if (! DECL_FRIEND_P (fndecl))
10821 if (TREE_CHAIN (fndecl))
10823 fndecl = copy_node (fndecl);
10824 TREE_CHAIN (fndecl) = NULL_TREE;
10826 grok_special_member_properties (fndecl);
10829 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
10831 /* Make a place for the parms. */
10832 begin_scope (sk_function_parms, fndecl);
10834 DECL_IN_AGGR_P (fndecl) = 1;
10838 /* Go through the motions of finishing a function definition.
10839 We don't compile this method until after the whole class has
10842 FINISH_METHOD must return something that looks as though it
10843 came from GROKFIELD (since we are defining a method, after all).
10845 This is called after parsing the body of the function definition.
10846 STMTS is the chain of statements that makes up the function body.
10848 DECL is the ..._DECL that `start_method' provided. */
10851 finish_method (tree decl)
10853 tree fndecl = decl;
10858 if (decl == void_type_node)
10861 old_initial = DECL_INITIAL (fndecl);
10863 /* Undo the level for the parms (from start_method).
10864 This is like poplevel, but it causes nothing to be
10865 saved. Saving information here confuses symbol-table
10866 output routines. Besides, this information will
10867 be correctly output when this method is actually
10870 /* Clear out the meanings of the local variables of this level;
10871 also record in each decl which block it belongs to. */
10873 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
10875 if (DECL_NAME (link) != NULL_TREE)
10876 pop_binding (DECL_NAME (link), link);
10877 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
10878 DECL_CONTEXT (link) = NULL_TREE;
10881 poplevel (0, 0, 0);
10883 DECL_INITIAL (fndecl) = old_initial;
10885 /* We used to check if the context of FNDECL was different from
10886 current_class_type as another way to get inside here. This didn't work
10887 for String.cc in libg++. */
10888 if (DECL_FRIEND_P (fndecl))
10890 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
10892 decl = void_type_node;
10899 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
10900 we can lay it out later, when and if its type becomes complete. */
10903 maybe_register_incomplete_var (tree var)
10905 gcc_assert (TREE_CODE (var) == VAR_DECL);
10907 /* Keep track of variables with incomplete types. */
10908 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
10909 && DECL_EXTERNAL (var))
10911 tree inner_type = TREE_TYPE (var);
10913 while (TREE_CODE (inner_type) == ARRAY_TYPE)
10914 inner_type = TREE_TYPE (inner_type);
10915 inner_type = TYPE_MAIN_VARIANT (inner_type);
10917 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
10918 /* RTTI TD entries are created while defining the type_info. */
10919 || (TYPE_LANG_SPECIFIC (inner_type)
10920 && TYPE_BEING_DEFINED (inner_type)))
10921 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
10925 /* Called when a class type (given by TYPE) is defined. If there are
10926 any existing VAR_DECLs whose type hsa been completed by this
10927 declaration, update them now. */
10930 complete_vars (tree type)
10932 tree *list = &incomplete_vars;
10934 gcc_assert (CLASS_TYPE_P (type));
10937 if (same_type_p (type, TREE_PURPOSE (*list)))
10939 tree var = TREE_VALUE (*list);
10940 tree type = TREE_TYPE (var);
10941 /* Complete the type of the variable. The VAR_DECL itself
10942 will be laid out in expand_expr. */
10943 complete_type (type);
10944 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
10945 /* Remove this entry from the list. */
10946 *list = TREE_CHAIN (*list);
10949 list = &TREE_CHAIN (*list);
10952 /* Check for pending declarations which may have abstract type. */
10953 complete_type_check_abstract (type);
10956 /* If DECL is of a type which needs a cleanup, build that cleanup
10960 cxx_maybe_build_cleanup (tree decl)
10962 tree type = TREE_TYPE (decl);
10964 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
10966 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
10968 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
10969 && CLASSTYPE_VBASECLASSES (type));
10971 if (TREE_CODE (type) == ARRAY_TYPE)
10975 cxx_mark_addressable (decl);
10976 rval = build_unary_op (ADDR_EXPR, decl, 0);
10979 /* Optimize for space over speed here. */
10980 if (!has_vbases || flag_expensive_optimizations)
10981 flags |= LOOKUP_NONVIRTUAL;
10983 rval = build_delete (TREE_TYPE (rval), rval,
10984 sfk_complete_destructor, flags, 0);
10991 /* When a stmt has been parsed, this function is called. */
10998 /* DECL was originally constructed as a non-static member function,
10999 but turned out to be static. Update it accordingly. */
11002 revert_static_member_fn (tree decl)
11005 tree function = TREE_TYPE (decl);
11006 tree args = TYPE_ARG_TYPES (function);
11008 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11009 != TYPE_UNQUALIFIED)
11010 error ("static member function %q#D declared with type qualifiers", decl);
11012 args = TREE_CHAIN (args);
11013 tmp = build_function_type (TREE_TYPE (function), args);
11014 tmp = build_qualified_type (tmp, cp_type_quals (function));
11015 tmp = build_exception_variant (tmp,
11016 TYPE_RAISES_EXCEPTIONS (function));
11017 TREE_TYPE (decl) = tmp;
11018 if (DECL_ARGUMENTS (decl))
11019 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11020 DECL_STATIC_FUNCTION_P (decl) = 1;
11023 /* Initialize the variables used during compilation of a C++
11027 cxx_push_function_context (struct function * f)
11029 struct language_function *p = GGC_CNEW (struct language_function);
11032 /* Whenever we start a new function, we destroy temporaries in the
11034 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11040 if (DECL_SAVED_FUNCTION_DATA (fn))
11042 /* If we already parsed this function, and we're just expanding it
11043 now, restore saved state. */
11044 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11046 /* We don't need the saved data anymore. Unless this is an inline
11047 function; we need the named return value info for
11048 declare_return_variable. */
11049 if (! DECL_INLINE (fn))
11050 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11055 /* Free the language-specific parts of F, now that we've finished
11056 compiling the function. */
11059 cxx_pop_function_context (struct function * f)
11064 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11065 one of the language-independent trees. */
11067 enum cp_tree_node_structure_enum
11068 cp_tree_node_structure (union lang_tree_node * t)
11070 switch (TREE_CODE (&t->generic))
11072 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11073 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11074 case OVERLOAD: return TS_CP_OVERLOAD;
11075 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11076 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11077 case PTRMEM_CST: return TS_CP_PTRMEM;
11078 case BASELINK: return TS_CP_BASELINK;
11079 default: return TS_CP_GENERIC;
11083 /* Build the void_list_node (void_type_node having been created). */
11085 build_void_list_node (void)
11087 tree t = build_tree_list (NULL_TREE, void_type_node);
11092 cp_missing_noreturn_ok_p (tree decl)
11094 /* A missing noreturn is ok for the `main' function. */
11095 return DECL_MAIN_P (decl);
11098 /* Return the COMDAT group into which DECL should be placed. */
11101 cxx_comdat_group (tree decl)
11105 /* Virtual tables, construction virtual tables, and virtual table
11106 tables all go in a single COMDAT group, named after the primary
11108 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11109 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11110 /* For all other DECLs, the COMDAT group is the mangled name of the
11111 declaration itself. */
11114 while (DECL_THUNK_P (decl))
11116 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11117 into the same section as the target function. In that case
11118 we must return target's name. */
11119 tree target = THUNK_TARGET (decl);
11120 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11121 && DECL_SECTION_NAME (target) != NULL
11122 && DECL_ONE_ONLY (target))
11127 name = DECL_ASSEMBLER_NAME (decl);
11130 return IDENTIFIER_POINTER (name);
11133 #include "gt-cp-decl.h"