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 (0, "%Jfunction %qD redeclared as inline", newdecl, newdecl);
1055 warning (0, "%Jprevious declaration of %qD with attribute noinline",
1058 else if (DECL_DECLARED_INLINE_P (olddecl)
1059 && DECL_UNINLINABLE (newdecl)
1060 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1062 warning (0, "%Jfunction %qD redeclared with attribute noinline",
1064 warning (0, "%Jprevious declaration of %qD was inline",
1069 /* Check for redeclaration and other discrepancies. */
1070 if (TREE_CODE (olddecl) == FUNCTION_DECL
1071 && DECL_ARTIFICIAL (olddecl))
1073 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1075 /* Avoid warnings redeclaring anticipated built-ins. */
1076 if (DECL_ANTICIPATED (olddecl))
1079 /* If you declare a built-in or predefined function name as static,
1080 the old definition is overridden, but optionally warn this was a
1081 bad choice of name. */
1082 if (! TREE_PUBLIC (newdecl))
1085 warning (0, "shadowing %s function %q#D",
1086 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1088 /* Discard the old built-in function. */
1091 /* If the built-in is not ansi, then programs can override
1092 it even globally without an error. */
1093 else if (! DECL_BUILT_IN (olddecl))
1094 warning (0, "library function %q#D redeclared as non-function %q#D",
1098 error ("declaration of %q#D", newdecl);
1099 error ("conflicts with built-in declaration %q#D",
1104 else if (!types_match)
1106 /* Avoid warnings redeclaring anticipated built-ins. */
1107 if (DECL_ANTICIPATED (olddecl))
1109 /* Deal with fileptr_type_node. FILE type is not known
1110 at the time we create the builtins. */
1113 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1114 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1116 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1119 else if (TREE_VALUE (t2) == fileptr_type_node)
1121 tree t = TREE_VALUE (t1);
1123 if (TREE_CODE (t) == POINTER_TYPE
1124 && TYPE_NAME (TREE_TYPE (t))
1125 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1126 == get_identifier ("FILE")
1127 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1129 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1131 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1132 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1133 types_match = decls_match (newdecl, olddecl);
1135 return duplicate_decls (newdecl, olddecl);
1136 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1139 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1142 else if ((DECL_EXTERN_C_P (newdecl)
1143 && DECL_EXTERN_C_P (olddecl))
1144 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1145 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1147 /* A near match; override the builtin. */
1149 if (TREE_PUBLIC (newdecl))
1151 warning (0, "new declaration %q#D", newdecl);
1152 warning (0, "ambiguates built-in declaration %q#D",
1155 else if (warn_shadow)
1156 warning (0, "shadowing %s function %q#D",
1157 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1161 /* Discard the old built-in function. */
1164 /* Replace the old RTL to avoid problems with inlining. */
1165 COPY_DECL_RTL (newdecl, olddecl);
1167 /* Even if the types match, prefer the new declarations type
1168 for anticipated built-ins, for exception lists, etc... */
1169 else if (DECL_ANTICIPATED (olddecl))
1171 tree type = TREE_TYPE (newdecl);
1172 tree attribs = (*targetm.merge_type_attributes)
1173 (TREE_TYPE (olddecl), type);
1175 type = cp_build_type_attribute_variant (type, attribs);
1176 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1179 /* Whether or not the builtin can throw exceptions has no
1180 bearing on this declarator. */
1181 TREE_NOTHROW (olddecl) = 0;
1183 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1185 /* If a builtin function is redeclared as `static', merge
1186 the declarations, but make the original one static. */
1187 DECL_THIS_STATIC (olddecl) = 1;
1188 TREE_PUBLIC (olddecl) = 0;
1190 /* Make the old declaration consistent with the new one so
1191 that all remnants of the builtin-ness of this function
1192 will be banished. */
1193 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1194 COPY_DECL_RTL (newdecl, olddecl);
1197 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1199 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1200 && TREE_CODE (newdecl) != TYPE_DECL
1201 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1202 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1203 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1204 && TREE_CODE (olddecl) != TYPE_DECL
1205 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1206 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1209 /* We do nothing special here, because C++ does such nasty
1210 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1211 get shadowed, and know that if we need to find a TYPE_DECL
1212 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1213 slot of the identifier. */
1217 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1218 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1219 || (TREE_CODE (olddecl) == FUNCTION_DECL
1220 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1223 error ("%q#D redeclared as different kind of symbol", newdecl);
1224 if (TREE_CODE (olddecl) == TREE_LIST)
1225 olddecl = TREE_VALUE (olddecl);
1226 cp_error_at ("previous declaration of %q#D", olddecl);
1228 return error_mark_node;
1230 else if (!types_match)
1232 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1233 /* These are certainly not duplicate declarations; they're
1234 from different scopes. */
1237 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1239 /* The name of a class template may not be declared to refer to
1240 any other template, class, function, object, namespace, value,
1241 or type in the same scope. */
1242 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1243 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1245 error ("declaration of template %q#D", newdecl);
1246 cp_error_at ("conflicts with previous declaration %q#D",
1249 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1250 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1251 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1252 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1253 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1254 DECL_TEMPLATE_PARMS (olddecl))
1255 /* Template functions can be disambiguated by
1257 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1258 TREE_TYPE (TREE_TYPE (olddecl))))
1260 error ("new declaration %q#D", newdecl);
1261 cp_error_at ("ambiguates old declaration %q#D", olddecl);
1265 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1267 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1269 error ("declaration of C function %q#D conflicts with",
1271 cp_error_at ("previous declaration %q#D here", olddecl);
1273 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1274 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1276 error ("new declaration %q#D", newdecl);
1277 cp_error_at ("ambiguates old declaration %q#D", olddecl);
1284 error ("conflicting declaration %q#D", newdecl);
1285 cp_error_at ("%qD has a previous declaration as %q#D",
1287 return error_mark_node;
1290 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1291 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1292 && (!DECL_TEMPLATE_INFO (newdecl)
1293 || (DECL_TI_TEMPLATE (newdecl)
1294 != DECL_TI_TEMPLATE (olddecl))))
1295 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1296 && (!DECL_TEMPLATE_INFO (olddecl)
1297 || (DECL_TI_TEMPLATE (olddecl)
1298 != DECL_TI_TEMPLATE (newdecl))))))
1299 /* It's OK to have a template specialization and a non-template
1300 with the same type, or to have specializations of two
1301 different templates with the same type. Note that if one is a
1302 specialization, and the other is an instantiation of the same
1303 template, that we do not exit at this point. That situation
1304 can occur if we instantiate a template class, and then
1305 specialize one of its methods. This situation is valid, but
1306 the declarations must be merged in the usual way. */
1308 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1309 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1310 && !DECL_USE_TEMPLATE (newdecl))
1311 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1312 && !DECL_USE_TEMPLATE (olddecl))))
1313 /* One of the declarations is a template instantiation, and the
1314 other is not a template at all. That's OK. */
1316 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1318 /* In [namespace.alias] we have:
1320 In a declarative region, a namespace-alias-definition can be
1321 used to redefine a namespace-alias declared in that declarative
1322 region to refer only to the namespace to which it already
1325 Therefore, if we encounter a second alias directive for the same
1326 alias, we can just ignore the second directive. */
1327 if (DECL_NAMESPACE_ALIAS (newdecl)
1328 && (DECL_NAMESPACE_ALIAS (newdecl)
1329 == DECL_NAMESPACE_ALIAS (olddecl)))
1331 /* [namespace.alias]
1333 A namespace-name or namespace-alias shall not be declared as
1334 the name of any other entity in the same declarative region.
1335 A namespace-name defined at global scope shall not be
1336 declared as the name of any other entity in any global scope
1338 error ("declaration of namespace %qD conflicts with", newdecl);
1339 cp_error_at ("previous declaration of namespace %qD here", olddecl);
1340 return error_mark_node;
1344 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1347 error (errmsg, newdecl);
1348 if (DECL_NAME (olddecl) != NULL_TREE)
1349 cp_error_at ((DECL_INITIAL (olddecl)
1350 && namespace_bindings_p ())
1351 ? "%q#D previously defined here"
1352 : "%q#D previously declared here", olddecl);
1353 return error_mark_node;
1355 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1356 && DECL_INITIAL (olddecl) != NULL_TREE
1357 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1358 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1360 /* Prototype decl follows defn w/o prototype. */
1361 cp_warning_at ("prototype for %q#D", newdecl);
1362 warning (0, "%Jfollows non-prototype definition here", olddecl);
1364 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1365 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1367 /* extern "C" int foo ();
1368 int foo () { bar (); }
1370 if (current_lang_depth () == 0)
1371 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1374 cp_error_at ("previous declaration of %q#D with %qL linkage",
1375 olddecl, DECL_LANGUAGE (olddecl));
1376 error ("conflicts with new declaration with %qL linkage",
1377 DECL_LANGUAGE (newdecl));
1381 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1383 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1385 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1386 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1389 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1390 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1392 for (; t1 && t1 != void_list_node;
1393 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1394 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1396 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1399 pedwarn ("default argument given for parameter %d of %q#D",
1401 cp_pedwarn_at ("after previous specification in %q#D",
1406 error ("default argument given for parameter %d of %q#D",
1408 cp_error_at ("after previous specification in %q#D",
1413 if (DECL_DECLARED_INLINE_P (newdecl)
1414 && ! DECL_DECLARED_INLINE_P (olddecl)
1415 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1417 warning (0, "%q#D was used before it was declared inline", newdecl);
1418 warning (0, "%Jprevious non-inline declaration here", olddecl);
1423 /* Do not merge an implicit typedef with an explicit one. In:
1427 typedef class A A __attribute__ ((foo));
1429 the attribute should apply only to the typedef. */
1430 if (TREE_CODE (olddecl) == TYPE_DECL
1431 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1432 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1435 /* If new decl is `static' and an `extern' was seen previously,
1437 warn_extern_redeclared_static (newdecl, olddecl);
1439 /* We have committed to returning 1 at this point. */
1440 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1442 /* Now that functions must hold information normally held
1443 by field decls, there is extra work to do so that
1444 declaration information does not get destroyed during
1446 if (DECL_VINDEX (olddecl))
1447 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1448 if (DECL_CONTEXT (olddecl))
1449 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1450 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1451 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1452 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1453 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1454 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1455 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1456 SET_OVERLOADED_OPERATOR_CODE
1457 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1458 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1460 /* Optionally warn about more than one declaration for the same
1461 name, but don't warn about a function declaration followed by a
1463 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1464 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1465 /* Don't warn about extern decl followed by definition. */
1466 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1467 /* Don't warn about friends, let add_friend take care of it. */
1468 && ! (DECL_FRIEND_P (newdecl) || DECL_FRIEND_P (olddecl)))
1470 warning (0, "redundant redeclaration of %qD in same scope", newdecl);
1471 cp_warning_at ("previous declaration of %qD", olddecl);
1475 /* Deal with C++: must preserve virtual function table size. */
1476 if (TREE_CODE (olddecl) == TYPE_DECL)
1478 tree newtype = TREE_TYPE (newdecl);
1479 tree oldtype = TREE_TYPE (olddecl);
1481 if (newtype != error_mark_node && oldtype != error_mark_node
1482 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1483 CLASSTYPE_FRIEND_CLASSES (newtype)
1484 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1486 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1489 /* Copy all the DECL_... slots specified in the new decl
1490 except for any that we copy here from the old type. */
1491 DECL_ATTRIBUTES (newdecl)
1492 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1494 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1496 TREE_TYPE (olddecl) = TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl));
1497 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1498 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1499 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1501 /* If the new declaration is a definition, update the file and
1502 line information on the declaration. */
1503 if (DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)) == NULL_TREE
1504 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl)) != NULL_TREE)
1506 DECL_SOURCE_LOCATION (olddecl)
1507 = DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (olddecl))
1508 = DECL_SOURCE_LOCATION (newdecl);
1509 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1510 DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (olddecl))
1511 = DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (newdecl));
1514 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1516 DECL_INLINE (DECL_TEMPLATE_RESULT (olddecl))
1517 |= DECL_INLINE (DECL_TEMPLATE_RESULT (newdecl));
1518 DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (olddecl))
1519 |= DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (newdecl));
1527 /* Automatically handles default parameters. */
1528 tree oldtype = TREE_TYPE (olddecl);
1531 /* Merge the data types specified in the two decls. */
1532 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1534 /* If merge_types produces a non-typedef type, just use the old type. */
1535 if (TREE_CODE (newdecl) == TYPE_DECL
1536 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1539 if (TREE_CODE (newdecl) == VAR_DECL)
1541 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1542 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1543 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1544 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1547 /* Do this after calling `merge_types' so that default
1548 parameters don't confuse us. */
1549 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1550 && (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl))
1551 != TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl))))
1553 TREE_TYPE (newdecl) = build_exception_variant (newtype,
1554 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)));
1555 TREE_TYPE (olddecl) = build_exception_variant (newtype,
1556 TYPE_RAISES_EXCEPTIONS (oldtype));
1558 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (olddecl))
1559 && ! DECL_IS_BUILTIN (olddecl)
1561 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)),
1562 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl)), 1))
1564 error ("declaration of %qF throws different exceptions",
1566 cp_error_at ("than previous declaration %qF", olddecl);
1569 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1571 /* Lay the type out, unless already done. */
1572 if (! same_type_p (newtype, oldtype)
1573 && TREE_TYPE (newdecl) != error_mark_node
1574 && !(processing_template_decl && uses_template_parms (newdecl)))
1575 layout_type (TREE_TYPE (newdecl));
1577 if ((TREE_CODE (newdecl) == VAR_DECL
1578 || TREE_CODE (newdecl) == PARM_DECL
1579 || TREE_CODE (newdecl) == RESULT_DECL
1580 || TREE_CODE (newdecl) == FIELD_DECL
1581 || TREE_CODE (newdecl) == TYPE_DECL)
1582 && !(processing_template_decl && uses_template_parms (newdecl)))
1583 layout_decl (newdecl, 0);
1585 /* Merge the type qualifiers. */
1586 if (TREE_READONLY (newdecl))
1587 TREE_READONLY (olddecl) = 1;
1588 if (TREE_THIS_VOLATILE (newdecl))
1589 TREE_THIS_VOLATILE (olddecl) = 1;
1590 if (TREE_NOTHROW (newdecl))
1591 TREE_NOTHROW (olddecl) = 1;
1593 /* Merge deprecatedness. */
1594 if (TREE_DEPRECATED (newdecl))
1595 TREE_DEPRECATED (olddecl) = 1;
1597 /* Merge the initialization information. */
1598 if (DECL_INITIAL (newdecl) == NULL_TREE
1599 && DECL_INITIAL (olddecl) != NULL_TREE)
1601 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1602 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1603 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1604 && DECL_LANG_SPECIFIC (newdecl)
1605 && DECL_LANG_SPECIFIC (olddecl))
1607 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1608 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1612 /* Merge the section attribute.
1613 We want to issue an error if the sections conflict but that must be
1614 done later in decl_attributes since we are called before attributes
1616 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1617 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1619 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1621 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1622 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1623 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1624 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1625 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1626 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1627 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1628 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1629 /* Keep the old RTL. */
1630 COPY_DECL_RTL (olddecl, newdecl);
1632 else if (TREE_CODE (newdecl) == VAR_DECL
1633 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1635 /* Keep the old RTL. We cannot keep the old RTL if the old
1636 declaration was for an incomplete object and the new
1637 declaration is not since many attributes of the RTL will
1639 COPY_DECL_RTL (olddecl, newdecl);
1642 /* If cannot merge, then use the new type and qualifiers,
1643 and don't preserve the old rtl. */
1646 /* Clean out any memory we had of the old declaration. */
1647 tree oldstatic = value_member (olddecl, static_aggregates);
1649 TREE_VALUE (oldstatic) = error_mark_node;
1651 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1652 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1653 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1654 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1657 /* Merge the storage class information. */
1658 merge_weak (newdecl, olddecl);
1660 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1661 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1662 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1663 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1664 if (! DECL_EXTERNAL (olddecl))
1665 DECL_EXTERNAL (newdecl) = 0;
1667 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1669 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1670 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1671 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1672 DECL_TEMPLATE_INSTANTIATED (newdecl)
1673 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1674 /* If the OLDDECL is an implicit instantiation, then the NEWDECL
1675 must be too. But, it may not yet be marked as such if the
1676 caller has created NEWDECL, but has not yet figured out that
1677 it is a redeclaration. */
1678 if (DECL_IMPLICIT_INSTANTIATION (olddecl)
1679 && !DECL_USE_TEMPLATE (newdecl))
1680 SET_DECL_IMPLICIT_INSTANTIATION (newdecl);
1681 /* Don't really know how much of the language-specific
1682 values we should copy from old to new. */
1683 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1684 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1685 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1686 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1687 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1688 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1689 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1690 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1691 olddecl_friend = DECL_FRIEND_P (olddecl);
1693 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1694 if (TREE_CODE (newdecl) == FUNCTION_DECL
1695 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1697 DECL_BEFRIENDING_CLASSES (newdecl)
1698 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1699 DECL_BEFRIENDING_CLASSES (olddecl));
1700 /* DECL_THUNKS is only valid for virtual functions,
1701 otherwise it is a DECL_FRIEND_CONTEXT. */
1702 if (DECL_VIRTUAL_P (newdecl))
1703 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1707 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1709 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1710 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1712 /* If newdecl is not a specialization, then it is not a
1713 template-related function at all. And that means that we
1714 should have exited above, returning 0. */
1715 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1717 if (TREE_USED (olddecl))
1718 /* From [temp.expl.spec]:
1720 If a template, a member template or the member of a class
1721 template is explicitly specialized then that
1722 specialization shall be declared before the first use of
1723 that specialization that would cause an implicit
1724 instantiation to take place, in every translation unit in
1725 which such a use occurs. */
1726 error ("explicit specialization of %qD after first use",
1729 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1731 /* [temp.expl.spec/14] We don't inline explicit specialization
1732 just because the primary template says so. */
1736 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1737 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1739 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1741 /* If either decl says `inline', this fn is inline, unless
1742 its definition was passed already. */
1743 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1744 DECL_INLINE (olddecl) = 1;
1745 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1747 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1748 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1751 /* Preserve abstractness on cloned [cd]tors. */
1752 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1756 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1757 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1758 COPY_DECL_RTL (newdecl, olddecl);
1760 if (! types_match || new_defines_function)
1762 /* These need to be copied so that the names are available.
1763 Note that if the types do match, we'll preserve inline
1764 info and other bits, but if not, we won't. */
1765 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1766 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1768 if (new_defines_function)
1769 /* If defining a function declared with other language
1770 linkage, use the previously declared language linkage. */
1771 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1772 else if (types_match)
1774 /* If redeclaring a builtin function, and not a definition,
1775 it stays built in. */
1776 if (DECL_BUILT_IN (olddecl))
1778 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1779 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1780 /* If we're keeping the built-in definition, keep the rtl,
1781 regardless of declaration matches. */
1782 COPY_DECL_RTL (olddecl, newdecl);
1785 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1786 /* Don't clear out the arguments if we're redefining a function. */
1787 if (DECL_ARGUMENTS (olddecl))
1788 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1791 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1792 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1794 /* Now preserve various other info from the definition. */
1795 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1796 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1797 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1798 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1800 /* Warn about conflicting visibility specifications. */
1801 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1802 && DECL_VISIBILITY_SPECIFIED (newdecl)
1803 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1805 warning (0, "%J%qD: visibility attribute ignored because it",
1807 warning (0, "%Jconflicts with previous declaration here", olddecl);
1809 /* Choose the declaration which specified visibility. */
1810 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1812 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1813 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1816 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1817 with that from NEWDECL below. */
1818 if (DECL_LANG_SPECIFIC (olddecl))
1820 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1821 != DECL_LANG_SPECIFIC (newdecl));
1822 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1825 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1829 function_size = sizeof (struct tree_decl);
1831 memcpy ((char *) olddecl + sizeof (struct tree_common),
1832 (char *) newdecl + sizeof (struct tree_common),
1833 function_size - sizeof (struct tree_common));
1835 if (DECL_TEMPLATE_INSTANTIATION (newdecl))
1836 /* If newdecl is a template instantiation, it is possible that
1837 the following sequence of events has occurred:
1839 o A friend function was declared in a class template. The
1840 class template was instantiated.
1842 o The instantiation of the friend declaration was
1843 recorded on the instantiation list, and is newdecl.
1845 o Later, however, instantiate_class_template called pushdecl
1846 on the newdecl to perform name injection. But, pushdecl in
1847 turn called duplicate_decls when it discovered that another
1848 declaration of a global function with the same name already
1851 o Here, in duplicate_decls, we decided to clobber newdecl.
1853 If we're going to do that, we'd better make sure that
1854 olddecl, and not newdecl, is on the list of
1855 instantiations so that if we try to do the instantiation
1856 again we won't get the clobbered declaration. */
1857 reregister_specialization (newdecl,
1858 DECL_TI_TEMPLATE (newdecl),
1863 memcpy ((char *) olddecl + sizeof (struct tree_common),
1864 (char *) newdecl + sizeof (struct tree_common),
1865 sizeof (struct tree_decl) - sizeof (struct tree_common)
1866 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1869 DECL_UID (olddecl) = olddecl_uid;
1871 DECL_FRIEND_P (olddecl) = 1;
1873 /* NEWDECL contains the merged attribute lists.
1874 Update OLDDECL to be the same. */
1875 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1877 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1878 so that encode_section_info has a chance to look at the new decl
1879 flags and attributes. */
1880 if (DECL_RTL_SET_P (olddecl)
1881 && (TREE_CODE (olddecl) == FUNCTION_DECL
1882 || (TREE_CODE (olddecl) == VAR_DECL
1883 && TREE_STATIC (olddecl))))
1884 make_decl_rtl (olddecl);
1886 /* The NEWDECL will no longer be needed. Because every out-of-class
1887 declaration of a member results in a call to duplicate_decls,
1888 freeing these nodes represents in a significant savings. */
1894 /* Return zero if the declaration NEWDECL is valid
1895 when the declaration OLDDECL (assumed to be for the same name)
1896 has already been seen.
1897 Otherwise return an error message format string with a %s
1898 where the identifier should go. */
1901 redeclaration_error_message (tree newdecl, tree olddecl)
1903 if (TREE_CODE (newdecl) == TYPE_DECL)
1905 /* Because C++ can put things into name space for free,
1906 constructs like "typedef struct foo { ... } foo"
1907 would look like an erroneous redeclaration. */
1908 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1911 return "redefinition of %q#D";
1913 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1915 /* If this is a pure function, its olddecl will actually be
1916 the original initialization to `0' (which we force to call
1917 abort()). Don't complain about redefinition in this case. */
1918 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1919 && DECL_INITIAL (olddecl) == NULL_TREE)
1922 /* If both functions come from different namespaces, this is not
1923 a redeclaration - this is a conflict with a used function. */
1924 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1925 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1926 && ! decls_match (olddecl, newdecl))
1927 return "%qD conflicts with used function";
1929 /* We'll complain about linkage mismatches in
1930 warn_extern_redeclared_static. */
1932 /* Defining the same name twice is no good. */
1933 if (DECL_INITIAL (olddecl) != NULL_TREE
1934 && DECL_INITIAL (newdecl) != NULL_TREE)
1936 if (DECL_NAME (olddecl) == NULL_TREE)
1937 return "%q#D not declared in class";
1939 return "redefinition of %q#D";
1943 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1947 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1949 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
1950 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
1951 return "redefinition of %q#D";
1955 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
1956 || (DECL_TEMPLATE_RESULT (newdecl)
1957 == DECL_TEMPLATE_RESULT (olddecl)))
1960 nt = DECL_TEMPLATE_RESULT (newdecl);
1961 if (DECL_TEMPLATE_INFO (nt))
1962 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
1963 ot = DECL_TEMPLATE_RESULT (olddecl);
1964 if (DECL_TEMPLATE_INFO (ot))
1965 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
1966 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
1967 return "redefinition of %q#D";
1971 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
1973 /* Objects declared at top level: */
1974 /* If at least one is a reference, it's ok. */
1975 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
1977 /* Reject two definitions. */
1978 return "redefinition of %q#D";
1982 /* Objects declared with block scope: */
1983 /* Reject two definitions, and reject a definition
1984 together with an external reference. */
1985 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
1986 return "redeclaration of %q#D";
1991 /* Create a new label, named ID. */
1994 make_label_decl (tree id, int local_p)
1998 decl = build_decl (LABEL_DECL, id, void_type_node);
2000 DECL_CONTEXT (decl) = current_function_decl;
2001 DECL_MODE (decl) = VOIDmode;
2002 C_DECLARED_LABEL_FLAG (decl) = local_p;
2004 /* Say where one reference is to the label, for the sake of the
2005 error if it is not defined. */
2006 DECL_SOURCE_LOCATION (decl) = input_location;
2008 /* Record the fact that this identifier is bound to this label. */
2009 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2014 /* Record this label on the list of used labels so that we can check
2015 at the end of the function to see whether or not the label was
2016 actually defined, and so we can check when the label is defined whether
2017 this use is valid. */
2020 use_label (tree decl)
2022 if (named_label_uses == NULL
2023 || named_label_uses->names_in_scope != current_binding_level->names
2024 || named_label_uses->label_decl != decl)
2026 struct named_label_use_list *new_ent;
2027 new_ent = GGC_NEW (struct named_label_use_list);
2028 new_ent->label_decl = decl;
2029 new_ent->names_in_scope = current_binding_level->names;
2030 new_ent->binding_level = current_binding_level;
2031 new_ent->o_goto_locus = input_location;
2032 new_ent->next = named_label_uses;
2033 named_label_uses = new_ent;
2037 /* Look for a label named ID in the current function. If one cannot
2038 be found, create one. (We keep track of used, but undefined,
2039 labels, and complain about them at the end of a function.) */
2042 lookup_label (tree id)
2045 struct named_label_list *ent;
2047 timevar_push (TV_NAME_LOOKUP);
2048 /* You can't use labels at global scope. */
2049 if (current_function_decl == NULL_TREE)
2051 error ("label %qE referenced outside of any function", id);
2052 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2055 /* See if we've already got this label. */
2056 decl = IDENTIFIER_LABEL_VALUE (id);
2057 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2058 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2060 /* Record this label on the list of labels used in this function.
2061 We do this before calling make_label_decl so that we get the
2062 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2063 ent = GGC_CNEW (struct named_label_list);
2064 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2065 ent->next = named_labels;
2068 /* We need a new label. */
2069 decl = make_label_decl (id, /*local_p=*/0);
2071 /* Now fill in the information we didn't have before. */
2072 ent->label_decl = decl;
2074 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2077 /* Declare a local label named ID. */
2080 declare_local_label (tree id)
2084 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2085 this scope we can restore the old value of
2086 IDENTIFIER_TYPE_VALUE. */
2087 current_binding_level->shadowed_labels
2088 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2089 current_binding_level->shadowed_labels);
2090 /* Look for the label. */
2091 decl = make_label_decl (id, /*local_p=*/1);
2092 /* Now fill in the information we didn't have before. */
2093 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2098 /* Returns nonzero if it is ill-formed to jump past the declaration of
2099 DECL. Returns 2 if it's also a real problem. */
2102 decl_jump_unsafe (tree decl)
2104 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
2107 if (DECL_INITIAL (decl) == NULL_TREE
2108 && pod_type_p (TREE_TYPE (decl)))
2111 /* This is really only important if we're crossing an initialization.
2112 The POD stuff is just pedantry; why should it matter if the class
2113 contains a field of pointer to member type? */
2114 if (DECL_INITIAL (decl)
2115 || (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))))
2120 /* Check that a single previously seen jump to a newly defined label
2121 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2122 the jump context; NAMES are the names in scope in LEVEL at the jump
2123 context; FILE and LINE are the source position of the jump or 0. */
2126 check_previous_goto_1 (tree decl,
2127 struct cp_binding_level* level,
2128 tree names, const location_t *locus)
2132 struct cp_binding_level *b = current_binding_level;
2133 for (; b; b = b->level_chain)
2135 tree new_decls = b->names;
2136 tree old_decls = (b == level ? names : NULL_TREE);
2137 for (; new_decls != old_decls;
2138 new_decls = TREE_CHAIN (new_decls))
2140 int problem = decl_jump_unsafe (new_decls);
2147 pedwarn ("jump to label %qD", decl);
2149 pedwarn ("jump to case label");
2152 pedwarn ("%H from here", locus);
2157 cp_error_at (" crosses initialization of %q#D",
2160 cp_pedwarn_at (" enters scope of non-POD %q#D",
2166 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2171 pedwarn ("jump to label %qD", decl);
2173 pedwarn ("jump to case label");
2176 pedwarn ("%H from here", locus);
2179 if (b->kind == sk_try)
2180 error (" enters try block");
2182 error (" enters catch block");
2189 check_previous_goto (struct named_label_use_list* use)
2191 check_previous_goto_1 (use->label_decl, use->binding_level,
2192 use->names_in_scope, &use->o_goto_locus);
2196 check_switch_goto (struct cp_binding_level* level)
2198 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2201 /* Check that any previously seen jumps to a newly defined label DECL
2202 are OK. Called by define_label. */
2205 check_previous_gotos (tree decl)
2207 struct named_label_use_list **usep;
2209 if (! TREE_USED (decl))
2212 for (usep = &named_label_uses; *usep; )
2214 struct named_label_use_list *use = *usep;
2215 if (use->label_decl == decl)
2217 check_previous_goto (use);
2221 usep = &(use->next);
2225 /* Check that a new jump to a label DECL is OK. Called by
2226 finish_goto_stmt. */
2229 check_goto (tree decl)
2233 struct named_label_list *lab;
2235 /* We can't know where a computed goto is jumping. So we assume
2237 if (! DECL_P (decl))
2240 /* If the label hasn't been defined yet, defer checking. */
2241 if (! DECL_INITIAL (decl))
2247 for (lab = named_labels; lab; lab = lab->next)
2248 if (decl == lab->label_decl)
2251 /* If the label is not on named_labels it's a gcc local label, so
2252 it must be in an outer scope, so jumping to it is always OK. */
2256 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2259 cp_pedwarn_at ("jump to label %qD", decl);
2260 pedwarn (" from here");
2264 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2266 tree b = TREE_VALUE (bad);
2267 int u = decl_jump_unsafe (b);
2269 if (u > 1 && DECL_ARTIFICIAL (b))
2270 /* Can't skip init of __exception_info. */
2271 error ("%J enters catch block", b);
2273 cp_error_at (" skips initialization of %q#D", b);
2275 cp_pedwarn_at (" enters scope of non-POD %q#D", b);
2278 if (lab->in_try_scope)
2279 error (" enters try block");
2280 else if (lab->in_catch_scope)
2281 error (" enters catch block");
2284 /* Define a label, specifying the location in the source file.
2285 Return the LABEL_DECL node for the label. */
2288 define_label (location_t location, tree name)
2290 tree decl = lookup_label (name);
2291 struct named_label_list *ent;
2292 struct cp_binding_level *p;
2294 timevar_push (TV_NAME_LOOKUP);
2295 for (ent = named_labels; ent; ent = ent->next)
2296 if (ent->label_decl == decl)
2299 /* After labels, make any new cleanups in the function go into their
2300 own new (temporary) binding contour. */
2301 for (p = current_binding_level;
2302 p->kind != sk_function_parms;
2304 p->more_cleanups_ok = 0;
2306 if (name == get_identifier ("wchar_t"))
2307 pedwarn ("label named wchar_t");
2309 if (DECL_INITIAL (decl) != NULL_TREE)
2310 error ("duplicate label %qD", decl);
2313 /* Mark label as having been defined. */
2314 DECL_INITIAL (decl) = error_mark_node;
2315 /* Say where in the source. */
2316 DECL_SOURCE_LOCATION (decl) = location;
2319 ent->names_in_scope = current_binding_level->names;
2320 ent->binding_level = current_binding_level;
2322 check_previous_gotos (decl);
2325 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2330 struct cp_binding_level *level;
2331 struct cp_switch *next;
2332 /* The SWITCH_STMT being built. */
2334 /* A splay-tree mapping the low element of a case range to the high
2335 element, or NULL_TREE if there is no high element. Used to
2336 determine whether or not a new case label duplicates an old case
2337 label. We need a tree, rather than simply a hash table, because
2338 of the GNU case range extension. */
2342 /* A stack of the currently active switch statements. The innermost
2343 switch statement is on the top of the stack. There is no need to
2344 mark the stack for garbage collection because it is only active
2345 during the processing of the body of a function, and we never
2346 collect at that point. */
2348 static struct cp_switch *switch_stack;
2350 /* Called right after a switch-statement condition is parsed.
2351 SWITCH_STMT is the switch statement being parsed. */
2354 push_switch (tree switch_stmt)
2356 struct cp_switch *p = xmalloc (sizeof (struct cp_switch));
2357 p->level = current_binding_level;
2358 p->next = switch_stack;
2359 p->switch_stmt = switch_stmt;
2360 p->cases = splay_tree_new (case_compare, NULL, NULL);
2367 struct cp_switch *cs = switch_stack;
2368 location_t switch_location;
2370 /* Emit warnings as needed. */
2371 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2372 switch_location = EXPR_LOCATION (cs->switch_stmt);
2374 switch_location = input_location;
2375 c_do_switch_warnings (cs->cases, switch_location,
2376 SWITCH_STMT_TYPE (cs->switch_stmt),
2377 SWITCH_STMT_COND (cs->switch_stmt));
2379 splay_tree_delete (cs->cases);
2380 switch_stack = switch_stack->next;
2384 /* Note that we've seen a definition of a case label, and complain if this
2385 is a bad place for one. */
2388 finish_case_label (tree low_value, tree high_value)
2391 struct cp_binding_level *p;
2393 if (processing_template_decl)
2397 /* For templates, just add the case label; we'll do semantic
2398 analysis at instantiation-time. */
2399 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2400 return add_stmt (build_case_label (low_value, high_value, label));
2403 /* Find the condition on which this switch statement depends. */
2404 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2405 if (cond && TREE_CODE (cond) == TREE_LIST)
2406 cond = TREE_VALUE (cond);
2408 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2409 low_value, high_value);
2411 check_switch_goto (switch_stack->level);
2413 /* After labels, make any new cleanups in the function go into their
2414 own new (temporary) binding contour. */
2415 for (p = current_binding_level;
2416 p->kind != sk_function_parms;
2418 p->more_cleanups_ok = 0;
2423 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2426 typename_hash (const void* k)
2431 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2432 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2437 typedef struct typename_info {
2445 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2448 typename_compare (const void * k1, const void * k2)
2451 const typename_info *t2;
2454 t2 = (const typename_info *) k2;
2456 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2457 && TYPE_CONTEXT (t1) == t2->scope
2458 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2459 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2460 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2463 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2464 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2466 Returns the new TYPENAME_TYPE. */
2468 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2471 build_typename_type (tree context, tree name, tree fullname,
2472 enum tag_types tag_type)
2480 if (typename_htab == NULL)
2481 typename_htab = htab_create_ggc (61, &typename_hash,
2482 &typename_compare, NULL);
2484 ti.scope = FROB_CONTEXT (context);
2486 ti.template_id = fullname;
2487 ti.enum_p = tag_type == enum_type;
2488 ti.class_p = (tag_type == class_type
2489 || tag_type == record_type
2490 || tag_type == union_type);
2491 hash = (htab_hash_pointer (ti.scope)
2492 ^ htab_hash_pointer (ti.name));
2494 /* See if we already have this type. */
2495 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2500 /* Build the TYPENAME_TYPE. */
2501 t = make_aggr_type (TYPENAME_TYPE);
2502 TYPE_CONTEXT (t) = ti.scope;
2503 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2504 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2505 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2507 /* Build the corresponding TYPE_DECL. */
2508 d = build_decl (TYPE_DECL, name, t);
2509 TYPE_NAME (TREE_TYPE (d)) = d;
2510 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2511 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2512 DECL_ARTIFICIAL (d) = 1;
2514 /* Store it in the hash table. */
2521 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2522 provided to name the type. Returns an appropriate type, unless an
2523 error occurs, in which case error_mark_node is returned. If we
2524 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2525 return that, rather than the _TYPE it corresponds to, in other
2526 cases we look through the type decl. If TF_ERROR is set, complain
2527 about errors, otherwise be quiet. */
2530 make_typename_type (tree context, tree name, enum tag_types tag_type,
2531 tsubst_flags_t complain)
2535 if (name == error_mark_node
2536 || context == NULL_TREE
2537 || context == error_mark_node)
2538 return error_mark_node;
2542 if (!(TYPE_LANG_SPECIFIC (name)
2543 && (CLASSTYPE_IS_TEMPLATE (name)
2544 || CLASSTYPE_USE_TEMPLATE (name))))
2545 name = TYPE_IDENTIFIER (name);
2547 /* Create a TEMPLATE_ID_EXPR for the type. */
2548 name = build_nt (TEMPLATE_ID_EXPR,
2549 CLASSTYPE_TI_TEMPLATE (name),
2550 CLASSTYPE_TI_ARGS (name));
2552 else if (TREE_CODE (name) == TYPE_DECL)
2553 name = DECL_NAME (name);
2557 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2559 name = TREE_OPERAND (name, 0);
2560 if (TREE_CODE (name) == TEMPLATE_DECL)
2561 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2563 if (TREE_CODE (name) == TEMPLATE_DECL)
2565 error ("%qD used without template parameters", name);
2566 return error_mark_node;
2568 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2569 gcc_assert (TYPE_P (context));
2571 if (!dependent_type_p (context)
2572 || currently_open_class (context))
2574 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2576 tree tmpl = NULL_TREE;
2577 if (IS_AGGR_TYPE (context))
2578 tmpl = lookup_field (context, name, 0, false);
2579 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2581 if (complain & tf_error)
2582 error ("no class template named %q#T in %q#T",
2584 return error_mark_node;
2587 if (complain & tf_error)
2588 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2590 return lookup_template_class (tmpl,
2591 TREE_OPERAND (fullname, 1),
2593 /*entering_scope=*/0,
2594 tf_error | tf_warning | tf_user);
2600 if (!IS_AGGR_TYPE (context))
2602 if (complain & tf_error)
2603 error ("no type named %q#T in %q#T", name, context);
2604 return error_mark_node;
2607 t = lookup_field (context, name, 0, true);
2610 if (TREE_CODE (t) != TYPE_DECL)
2612 if (complain & tf_error)
2613 error ("no type named %q#T in %q#T", name, context);
2614 return error_mark_node;
2617 if (complain & tf_error)
2618 perform_or_defer_access_check (TYPE_BINFO (context), t);
2620 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2628 /* If the CONTEXT is not a template type, then either the field is
2629 there now or its never going to be. */
2630 if (!dependent_type_p (context))
2632 if (complain & tf_error)
2633 error ("no type named %q#T in %q#T", name, context);
2634 return error_mark_node;
2637 return build_typename_type (context, name, fullname, tag_type);
2640 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2641 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2642 in which case error_mark_node is returned.
2644 If PARM_LIST is non-NULL, also make sure that the template parameter
2645 list of TEMPLATE_DECL matches.
2647 If COMPLAIN zero, don't complain about any errors that occur. */
2650 make_unbound_class_template (tree context, tree name, tree parm_list,
2651 tsubst_flags_t complain)
2657 name = TYPE_IDENTIFIER (name);
2658 else if (DECL_P (name))
2659 name = DECL_NAME (name);
2660 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2662 if (!dependent_type_p (context)
2663 || currently_open_class (context))
2665 tree tmpl = NULL_TREE;
2667 if (IS_AGGR_TYPE (context))
2668 tmpl = lookup_field (context, name, 0, false);
2670 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2672 if (complain & tf_error)
2673 error ("no class template named %q#T in %q#T", name, context);
2674 return error_mark_node;
2678 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2680 if (complain & tf_error)
2682 error ("template parameters do not match template");
2683 cp_error_at ("%qD declared here", tmpl);
2685 return error_mark_node;
2688 if (complain & tf_error)
2689 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2694 /* Build the UNBOUND_CLASS_TEMPLATE. */
2695 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2696 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2697 TREE_TYPE (t) = NULL_TREE;
2699 /* Build the corresponding TEMPLATE_DECL. */
2700 d = build_decl (TEMPLATE_DECL, name, t);
2701 TYPE_NAME (TREE_TYPE (d)) = d;
2702 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2703 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2704 DECL_ARTIFICIAL (d) = 1;
2705 DECL_TEMPLATE_PARMS (d) = parm_list;
2712 /* Push the declarations of builtin types into the namespace.
2713 RID_INDEX is the index of the builtin type in the array
2714 RID_POINTERS. NAME is the name used when looking up the builtin
2715 type. TYPE is the _TYPE node for the builtin type. */
2718 record_builtin_type (enum rid rid_index,
2722 tree rname = NULL_TREE, tname = NULL_TREE;
2723 tree tdecl = NULL_TREE;
2725 if ((int) rid_index < (int) RID_MAX)
2726 rname = ridpointers[(int) rid_index];
2728 tname = get_identifier (name);
2730 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2731 eliminated. Built-in types should not be looked up name; their
2732 names are keywords that the parser can recognize. However, there
2733 is code in c-common.c that uses identifier_global_value to look
2734 up built-in types by name. */
2737 tdecl = build_decl (TYPE_DECL, tname, type);
2738 DECL_ARTIFICIAL (tdecl) = 1;
2739 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2745 tdecl = build_decl (TYPE_DECL, rname, type);
2746 DECL_ARTIFICIAL (tdecl) = 1;
2748 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2751 if (!TYPE_NAME (type))
2752 TYPE_NAME (type) = tdecl;
2755 debug_hooks->type_decl (tdecl, 0);
2758 /* Record one of the standard Java types.
2759 * Declare it as having the given NAME.
2760 * If SIZE > 0, it is the size of one of the integral types;
2761 * otherwise it is the negative of the size of one of the other types. */
2764 record_builtin_java_type (const char* name, int size)
2768 type = make_signed_type (size);
2769 else if (size > -32)
2770 { /* "__java_char" or ""__java_boolean". */
2771 type = make_unsigned_type (-size);
2772 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2775 { /* "__java_float" or ""__java_double". */
2776 type = make_node (REAL_TYPE);
2777 TYPE_PRECISION (type) = - size;
2780 record_builtin_type (RID_MAX, name, type);
2781 decl = TYPE_NAME (type);
2783 /* Suppress generate debug symbol entries for these types,
2784 since for normal C++ they are just clutter.
2785 However, push_lang_context undoes this if extern "Java" is seen. */
2786 DECL_IGNORED_P (decl) = 1;
2788 TYPE_FOR_JAVA (type) = 1;
2792 /* Push a type into the namespace so that the back-ends ignore it. */
2795 record_unknown_type (tree type, const char* name)
2797 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2798 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2799 DECL_IGNORED_P (decl) = 1;
2800 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2801 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2802 TYPE_ALIGN (type) = 1;
2803 TYPE_USER_ALIGN (type) = 0;
2804 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2807 /* An string for which we should create an IDENTIFIER_NODE at
2810 typedef struct predefined_identifier
2812 /* The name of the identifier. */
2813 const char *const name;
2814 /* The place where the IDENTIFIER_NODE should be stored. */
2816 /* Nonzero if this is the name of a constructor or destructor. */
2817 const int ctor_or_dtor_p;
2818 } predefined_identifier;
2820 /* Create all the predefined identifiers. */
2823 initialize_predefined_identifiers (void)
2825 const predefined_identifier *pid;
2827 /* A table of identifiers to create at startup. */
2828 static const predefined_identifier predefined_identifiers[] = {
2829 { "C++", &lang_name_cplusplus, 0 },
2830 { "C", &lang_name_c, 0 },
2831 { "Java", &lang_name_java, 0 },
2832 /* Some of these names have a trailing space so that it is
2833 impossible for them to conflict with names written by users. */
2834 { "__ct ", &ctor_identifier, 1 },
2835 { "__base_ctor ", &base_ctor_identifier, 1 },
2836 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2837 { "__dt ", &dtor_identifier, 1 },
2838 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2839 { "__base_dtor ", &base_dtor_identifier, 1 },
2840 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2841 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2842 { "nelts", &nelts_identifier, 0 },
2843 { THIS_NAME, &this_identifier, 0 },
2844 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2845 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2846 { "_vptr", &vptr_identifier, 0 },
2847 { "__vtt_parm", &vtt_parm_identifier, 0 },
2848 { "::", &global_scope_name, 0 },
2849 { "std", &std_identifier, 0 },
2853 for (pid = predefined_identifiers; pid->name; ++pid)
2855 *pid->node = get_identifier (pid->name);
2856 if (pid->ctor_or_dtor_p)
2857 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2861 /* Create the predefined scalar types of C,
2862 and some nodes representing standard constants (0, 1, (void *)0).
2863 Initialize the global binding level.
2864 Make definitions for built-in primitive functions. */
2867 cxx_init_decl_processing (void)
2870 tree void_ftype_ptr;
2872 build_common_tree_nodes (flag_signed_char, false);
2874 /* Create all the identifiers we need. */
2875 initialize_predefined_identifiers ();
2877 /* Create the global variables. */
2878 push_to_top_level ();
2880 current_function_decl = NULL_TREE;
2881 current_binding_level = NULL;
2882 /* Enter the global namespace. */
2883 gcc_assert (global_namespace == NULL_TREE);
2884 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2886 begin_scope (sk_namespace, global_namespace);
2888 current_lang_name = NULL_TREE;
2890 /* Adjust various flags based on command-line settings. */
2891 if (!flag_permissive)
2892 flag_pedantic_errors = 1;
2893 if (!flag_no_inline)
2895 flag_inline_trees = 1;
2898 if (flag_inline_functions)
2899 flag_inline_trees = 2;
2901 /* Force minimum function alignment if using the least significant
2902 bit of function pointers to store the virtual bit. */
2903 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2904 && force_align_functions_log < 1)
2905 force_align_functions_log = 1;
2908 current_lang_name = lang_name_c;
2910 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2911 TREE_TYPE (error_mark_list) = error_mark_node;
2913 /* Create the `std' namespace. */
2914 push_namespace (std_identifier);
2915 std_node = current_namespace;
2918 c_common_nodes_and_builtins ();
2920 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
2921 java_short_type_node = record_builtin_java_type ("__java_short", 16);
2922 java_int_type_node = record_builtin_java_type ("__java_int", 32);
2923 java_long_type_node = record_builtin_java_type ("__java_long", 64);
2924 java_float_type_node = record_builtin_java_type ("__java_float", -32);
2925 java_double_type_node = record_builtin_java_type ("__java_double", -64);
2926 java_char_type_node = record_builtin_java_type ("__java_char", -16);
2927 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
2929 integer_two_node = build_int_cst (NULL_TREE, 2);
2930 integer_three_node = build_int_cst (NULL_TREE, 3);
2932 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
2933 truthvalue_type_node = boolean_type_node;
2934 truthvalue_false_node = boolean_false_node;
2935 truthvalue_true_node = boolean_true_node;
2937 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
2940 record_builtin_type (RID_MAX, NULL, string_type_node);
2943 delta_type_node = ptrdiff_type_node;
2944 vtable_index_type = ptrdiff_type_node;
2946 vtt_parm_type = build_pointer_type (const_ptr_type_node);
2947 void_ftype = build_function_type (void_type_node, void_list_node);
2948 void_ftype_ptr = build_function_type (void_type_node,
2949 tree_cons (NULL_TREE,
2953 = build_exception_variant (void_ftype_ptr, empty_except_spec);
2955 /* C++ extensions */
2957 unknown_type_node = make_node (UNKNOWN_TYPE);
2958 record_unknown_type (unknown_type_node, "unknown type");
2960 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
2961 TREE_TYPE (unknown_type_node) = unknown_type_node;
2963 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
2965 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
2966 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
2969 /* Make sure we get a unique function type, so we can give
2970 its pointer type a name. (This wins for gdb.) */
2971 tree vfunc_type = make_node (FUNCTION_TYPE);
2972 TREE_TYPE (vfunc_type) = integer_type_node;
2973 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
2974 layout_type (vfunc_type);
2976 vtable_entry_type = build_pointer_type (vfunc_type);
2978 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
2981 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
2982 layout_type (vtbl_type_node);
2983 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
2984 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
2985 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
2986 layout_type (vtbl_ptr_type_node);
2987 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
2989 push_namespace (get_identifier ("__cxxabiv1"));
2990 abi_node = current_namespace;
2993 global_type_node = make_node (LANG_TYPE);
2994 record_unknown_type (global_type_node, "global type");
2997 current_lang_name = lang_name_cplusplus;
3001 tree bad_alloc_type_node;
3002 tree bad_alloc_decl;
3003 tree newtype, deltype;
3004 tree ptr_ftype_sizetype;
3006 push_namespace (std_identifier);
3007 bad_alloc_id = get_identifier ("bad_alloc");
3008 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3009 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3011 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3012 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3013 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3017 = build_function_type (ptr_type_node,
3018 tree_cons (NULL_TREE,
3021 newtype = build_exception_variant
3022 (ptr_ftype_sizetype, add_exception_specifier
3023 (NULL_TREE, bad_alloc_type_node, -1));
3024 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3025 push_cp_library_fn (NEW_EXPR, newtype);
3026 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3027 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3028 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3032 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3034 /* Perform other language dependent initializations. */
3035 init_class_processing ();
3036 init_rtti_processing ();
3038 if (flag_exceptions)
3039 init_exception_processing ();
3041 if (! supports_one_only ())
3044 make_fname_decl = cp_make_fname_decl;
3045 start_fname_decls ();
3047 /* Show we use EH for cleanups. */
3048 if (flag_exceptions)
3049 using_eh_for_cleanups ();
3052 /* Generate an initializer for a function naming variable from
3053 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3054 filled in with the type of the init. */
3057 cp_fname_init (const char* name, tree *type_p)
3059 tree domain = NULL_TREE;
3061 tree init = NULL_TREE;
3066 length = strlen (name);
3067 domain = build_index_type (size_int (length));
3068 init = build_string (length + 1, name);
3071 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3072 type = build_cplus_array_type (type, domain);
3077 TREE_TYPE (init) = type;
3079 init = error_mark_node;
3084 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3085 decl, NAME is the initialization string and TYPE_DEP indicates whether
3086 NAME depended on the type of the function. We make use of that to detect
3087 __PRETTY_FUNCTION__ inside a template fn. This is being done
3088 lazily at the point of first use, so we mustn't push the decl now. */
3091 cp_make_fname_decl (tree id, int type_dep)
3093 const char *const name = (type_dep && processing_template_decl
3094 ? NULL : fname_as_string (type_dep));
3096 tree init = cp_fname_init (name, &type);
3097 tree decl = build_decl (VAR_DECL, id, type);
3100 free ((char *) name);
3102 /* As we're using pushdecl_with_scope, we must set the context. */
3103 DECL_CONTEXT (decl) = current_function_decl;
3104 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3106 TREE_STATIC (decl) = 1;
3107 TREE_READONLY (decl) = 1;
3108 DECL_ARTIFICIAL (decl) = 1;
3109 DECL_INITIAL (decl) = init;
3111 TREE_USED (decl) = 1;
3113 if (current_function_decl)
3115 struct cp_binding_level *b = current_binding_level;
3116 while (b->level_chain->kind != sk_function_parms)
3118 pushdecl_with_scope (decl, b);
3119 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3122 pushdecl_top_level_and_finish (decl, init);
3127 /* Make a definition for a builtin function named NAME in the current
3128 namespace, whose data type is TYPE and whose context is CONTEXT.
3129 TYPE should be a function type with argument types.
3131 CLASS and CODE tell later passes how to compile calls to this function.
3132 See tree.h for possible values.
3134 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3135 the name to be called if we can't opencode the function.
3136 If ATTRS is nonzero, use that for the function's attribute
3140 builtin_function_1 (const char* name,
3143 enum built_in_function code,
3144 enum built_in_class class,
3145 const char* libname,
3148 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3149 DECL_BUILT_IN_CLASS (decl) = class;
3150 DECL_FUNCTION_CODE (decl) = code;
3151 DECL_CONTEXT (decl) = context;
3155 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3156 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3157 function in the namespace. */
3159 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3161 /* Warn if a function in the namespace for users
3162 is used without an occasion to consider it declared. */
3163 if (name[0] != '_' || name[1] != '_')
3164 DECL_ANTICIPATED (decl) = 1;
3166 /* Possibly apply some default attributes to this built-in function. */
3168 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3170 decl_attributes (&decl, NULL_TREE, 0);
3175 /* Entry point for the benefit of c_common_nodes_and_builtins.
3177 Make a definition for a builtin function named NAME and whose data type
3178 is TYPE. TYPE should be a function type with argument types. This
3179 function places the anticipated declaration in the global namespace
3180 and additionally in the std namespace if appropriate.
3182 CLASS and CODE tell later passes how to compile calls to this function.
3183 See tree.h for possible values.
3185 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3186 the name to be called if we can't opencode the function.
3188 If ATTRS is nonzero, use that for the function's attribute
3192 builtin_function (const char* name,
3195 enum built_in_class cl,
3196 const char* libname,
3199 /* All builtins that don't begin with an '_' should additionally
3200 go in the 'std' namespace. */
3203 push_namespace (std_identifier);
3204 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3208 return builtin_function_1 (name, type, NULL_TREE, code,
3209 cl, libname, attrs);
3212 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3213 function. Not called directly. */
3216 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3218 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3219 DECL_EXTERNAL (fn) = 1;
3220 TREE_PUBLIC (fn) = 1;
3221 DECL_ARTIFICIAL (fn) = 1;
3222 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3223 SET_DECL_LANGUAGE (fn, lang_c);
3224 /* Runtime library routines are, by definition, available in an
3225 external shared object. */
3226 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3227 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3231 /* Returns the _DECL for a library function with C linkage.
3232 We assume that such functions never throw; if this is incorrect,
3233 callers should unset TREE_NOTHROW. */
3236 build_library_fn (tree name, tree type)
3238 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3239 TREE_NOTHROW (fn) = 1;
3243 /* Returns the _DECL for a library function with C++ linkage. */
3246 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3248 tree fn = build_library_fn_1 (name, operator_code, type);
3249 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3250 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3251 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3255 /* Like build_library_fn, but takes a C string instead of an
3259 build_library_fn_ptr (const char* name, tree type)
3261 return build_library_fn (get_identifier (name), type);
3264 /* Like build_cp_library_fn, but takes a C string instead of an
3268 build_cp_library_fn_ptr (const char* name, tree type)
3270 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3273 /* Like build_library_fn, but also pushes the function so that we will
3274 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3277 push_library_fn (tree name, tree type)
3279 tree fn = build_library_fn (name, type);
3280 pushdecl_top_level (fn);
3284 /* Like build_cp_library_fn, but also pushes the function so that it
3285 will be found by normal lookup. */
3288 push_cp_library_fn (enum tree_code operator_code, tree type)
3290 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3297 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3301 push_void_library_fn (tree name, tree parmtypes)
3303 tree type = build_function_type (void_type_node, parmtypes);
3304 return push_library_fn (name, type);
3307 /* Like push_library_fn, but also note that this function throws
3308 and does not return. Used for __throw_foo and the like. */
3311 push_throw_library_fn (tree name, tree type)
3313 tree fn = push_library_fn (name, type);
3314 TREE_THIS_VOLATILE (fn) = 1;
3315 TREE_NOTHROW (fn) = 0;
3319 /* When we call finish_struct for an anonymous union, we create
3320 default copy constructors and such. But, an anonymous union
3321 shouldn't have such things; this function undoes the damage to the
3322 anonymous union type T.
3324 (The reason that we create the synthesized methods is that we don't
3325 distinguish `union { int i; }' from `typedef union { int i; } U'.
3326 The first is an anonymous union; the second is just an ordinary
3330 fixup_anonymous_aggr (tree t)
3334 /* Wipe out memory of synthesized methods. */
3335 TYPE_HAS_CONSTRUCTOR (t) = 0;
3336 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3337 TYPE_HAS_INIT_REF (t) = 0;
3338 TYPE_HAS_CONST_INIT_REF (t) = 0;
3339 TYPE_HAS_ASSIGN_REF (t) = 0;
3340 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3342 /* Splice the implicitly generated functions out of the TYPE_METHODS
3344 q = &TYPE_METHODS (t);
3347 if (DECL_ARTIFICIAL (*q))
3348 *q = TREE_CHAIN (*q);
3350 q = &TREE_CHAIN (*q);
3353 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3354 if (TYPE_METHODS (t))
3355 error ("%Jan anonymous union cannot have function members",
3356 TYPE_MAIN_DECL (t));
3358 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3359 assignment operators (because they cannot have these methods themselves).
3360 For anonymous unions this is already checked because they are not allowed
3361 in any union, otherwise we have to check it. */
3362 if (TREE_CODE (t) != UNION_TYPE)
3366 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3367 if (TREE_CODE (field) == FIELD_DECL)
3369 type = TREE_TYPE (field);
3370 if (CLASS_TYPE_P (type))
3372 if (TYPE_NEEDS_CONSTRUCTING (type))
3373 cp_error_at ("member %q#D with constructor not allowed "
3374 "in anonymous aggregate",
3376 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3377 cp_error_at ("member %q#D with destructor not allowed "
3378 "in anonymous aggregate",
3380 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3381 cp_error_at ("member %q#D with copy assignment operator "
3382 "not allowed in anonymous aggregate",
3389 /* Make sure that a declaration with no declarator is well-formed, i.e.
3390 just declares a tagged type or anonymous union.
3392 Returns the type declared; or NULL_TREE if none. */
3395 check_tag_decl (cp_decl_specifier_seq *declspecs)
3397 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3398 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3399 /* If a class, struct, or enum type is declared by the DECLSPECS
3400 (i.e, if a class-specifier, enum-specifier, or non-typename
3401 elaborated-type-specifier appears in the DECLSPECS),
3402 DECLARED_TYPE is set to the corresponding type. */
3403 tree declared_type = NULL_TREE;
3404 bool error_p = false;
3406 if (declspecs->multiple_types_p)
3407 error ("multiple types in one declaration");
3408 else if (declspecs->redefined_builtin_type)
3410 if (!in_system_header)
3411 pedwarn ("redeclaration of C++ built-in type %qT",
3412 declspecs->redefined_builtin_type);
3417 && TYPE_P (declspecs->type)
3418 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3419 && IS_AGGR_TYPE (declspecs->type))
3420 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3421 declared_type = declspecs->type;
3422 else if (declspecs->type == error_mark_node)
3424 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3425 pedwarn ("declaration does not declare anything");
3426 /* Check for an anonymous union. */
3427 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3428 && TYPE_ANONYMOUS_P (declared_type))
3430 /* 7/3 In a simple-declaration, the optional init-declarator-list
3431 can be omitted only when declaring a class (clause 9) or
3432 enumeration (7.2), that is, when the decl-specifier-seq contains
3433 either a class-specifier, an elaborated-type-specifier with
3434 a class-key (9.1), or an enum-specifier. In these cases and
3435 whenever a class-specifier or enum-specifier is present in the
3436 decl-specifier-seq, the identifiers in these specifiers are among
3437 the names being declared by the declaration (as class-name,
3438 enum-names, or enumerators, depending on the syntax). In such
3439 cases, and except for the declaration of an unnamed bit-field (9.6),
3440 the decl-specifier-seq shall introduce one or more names into the
3441 program, or shall redeclare a name introduced by a previous
3442 declaration. [Example:
3443 enum { }; // ill-formed
3444 typedef class { }; // ill-formed
3448 error ("missing type-name in typedef-declaration");
3451 /* Anonymous unions are objects, so they can have specifiers. */;
3452 SET_ANON_AGGR_TYPE_P (declared_type);
3454 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3455 && !in_system_header)
3456 pedwarn ("ISO C++ prohibits anonymous structs");
3461 if (declspecs->specs[(int)ds_inline]
3462 || declspecs->specs[(int)ds_virtual])
3463 error ("%qs can only be specified for functions",
3464 declspecs->specs[(int)ds_inline]
3465 ? "inline" : "virtual");
3467 && (!current_class_type
3468 || current_scope () != current_class_type))
3469 error ("%<friend%> can only be specified inside a class");
3470 else if (declspecs->specs[(int)ds_explicit])
3471 error ("%<explicit%> can only be specified for constructors");
3472 else if (declspecs->storage_class)
3473 error ("a storage class can only be specified for objects "
3475 else if (declspecs->specs[(int)ds_const]
3476 || declspecs->specs[(int)ds_volatile]
3477 || declspecs->specs[(int)ds_restrict]
3478 || declspecs->specs[(int)ds_thread])
3479 error ("qualifiers can only be specified for objects "
3483 return declared_type;
3486 /* Called when a declaration is seen that contains no names to declare.
3487 If its type is a reference to a structure, union or enum inherited
3488 from a containing scope, shadow that tag name for the current scope
3489 with a forward reference.
3490 If its type defines a new named structure or union
3491 or defines an enum, it is valid but we need not do anything here.
3492 Otherwise, it is an error.
3494 C++: may have to grok the declspecs to learn about static,
3495 complain for anonymous unions.
3497 Returns the TYPE declared -- or NULL_TREE if none. */
3500 shadow_tag (cp_decl_specifier_seq *declspecs)
3502 tree t = check_tag_decl (declspecs);
3507 if (declspecs->attributes)
3509 cp_warning_at ("attribute ignored in declaration of %q#T", t);
3510 cp_warning_at ("attribute for %q#T must follow the %qs keyword",
3512 class_key_or_enum_as_string (t));
3516 maybe_process_partial_specialization (t);
3518 /* This is where the variables in an anonymous union are
3519 declared. An anonymous union declaration looks like:
3521 because there is no declarator after the union, the parser
3522 sends that declaration here. */
3523 if (ANON_AGGR_TYPE_P (t))
3525 fixup_anonymous_aggr (t);
3527 if (TYPE_FIELDS (t))
3529 tree decl = grokdeclarator (/*declarator=*/NULL,
3530 declspecs, NORMAL, 0, NULL);
3531 finish_anon_union (decl);
3538 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3541 groktypename (cp_decl_specifier_seq *type_specifiers,
3542 const cp_declarator *declarator)
3546 attrs = type_specifiers->attributes;
3547 type_specifiers->attributes = NULL_TREE;
3548 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3550 cplus_decl_attributes (&type, attrs, 0);
3554 /* Decode a declarator in an ordinary declaration or data definition.
3555 This is called as soon as the type information and variable name
3556 have been parsed, before parsing the initializer if any.
3557 Here we create the ..._DECL node, fill in its type,
3558 and put it on the list of decls for the current context.
3559 The ..._DECL node is returned as the value.
3561 Exception: for arrays where the length is not specified,
3562 the type is left null, to be filled in by `cp_finish_decl'.
3564 Function definitions do not come here; they go to start_function
3565 instead. However, external and forward declarations of functions
3566 do go through here. Structure field declarations are done by
3567 grokfield and not through here. */
3570 start_decl (const cp_declarator *declarator,
3571 cp_decl_specifier_seq *declspecs,
3574 tree prefix_attributes,
3575 tree *pushed_scope_p)
3581 *pushed_scope_p = NULL_TREE;
3583 /* This should only be done once on the top most decl. */
3584 if (have_extern_spec)
3586 declspecs->storage_class = sc_extern;
3587 have_extern_spec = false;
3590 /* An object declared as __attribute__((deprecated)) suppresses
3591 warnings of uses of other deprecated items. */
3592 if (lookup_attribute ("deprecated", attributes))
3593 deprecated_state = DEPRECATED_SUPPRESS;
3595 attributes = chainon (attributes, prefix_attributes);
3597 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3600 deprecated_state = DEPRECATED_NORMAL;
3602 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE)
3603 return error_mark_node;
3605 type = TREE_TYPE (decl);
3607 if (type == error_mark_node)
3608 return error_mark_node;
3610 context = DECL_CONTEXT (decl);
3614 *pushed_scope_p = push_scope (context);
3616 /* We are only interested in class contexts, later. */
3617 if (TREE_CODE (context) == NAMESPACE_DECL)
3618 context = NULL_TREE;
3622 /* Is it valid for this decl to have an initializer at all?
3623 If not, set INITIALIZED to zero, which will indirectly
3624 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3625 switch (TREE_CODE (decl))
3628 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3633 error ("function %q#D is initialized like a variable", decl);
3643 if (! toplevel_bindings_p ()
3644 && DECL_EXTERNAL (decl))
3645 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3647 DECL_EXTERNAL (decl) = 0;
3648 if (toplevel_bindings_p ())
3649 TREE_STATIC (decl) = 1;
3651 /* Tell `pushdecl' this is an initialized decl
3652 even though we don't yet have the initializer expression.
3653 Also tell `cp_finish_decl' it may store the real initializer. */
3654 DECL_INITIAL (decl) = error_mark_node;
3657 /* Set attributes here so if duplicate decl, will have proper attributes. */
3658 cplus_decl_attributes (&decl, attributes, 0);
3660 /* If #pragma weak was used, mark the decl weak now. */
3661 maybe_apply_pragma_weak (decl);
3663 if (TREE_CODE (decl) == FUNCTION_DECL
3664 && DECL_DECLARED_INLINE_P (decl)
3665 && DECL_UNINLINABLE (decl)
3666 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3667 warning (0, "%Jinline function %qD given attribute noinline", decl, decl);
3669 if (context && COMPLETE_TYPE_P (complete_type (context)))
3671 if (TREE_CODE (decl) == VAR_DECL)
3673 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3674 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3675 error ("%q#D is not a static member of %q#T", decl, context);
3678 if (DECL_CONTEXT (field) != context)
3680 if (!same_type_p (DECL_CONTEXT (field), context))
3681 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3682 "to be defined as %<%T::%D%>",
3683 DECL_CONTEXT (field), DECL_NAME (decl),
3684 context, DECL_NAME (decl));
3685 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3687 if (processing_specialization
3688 && template_class_depth (context) == 0
3689 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3690 error ("template header not allowed in member definition "
3691 "of explicitly specialized class");
3692 /* Static data member are tricky; an in-class initialization
3693 still doesn't provide a definition, so the in-class
3694 declaration will have DECL_EXTERNAL set, but will have an
3695 initialization. Thus, duplicate_decls won't warn
3696 about this situation, and so we check here. */
3697 if (DECL_INITIAL (decl) && DECL_INITIAL (field))
3698 error ("duplicate initialization of %qD", decl);
3699 if (duplicate_decls (decl, field))
3705 tree field = check_classfn (context, decl,
3706 (processing_template_decl
3707 > template_class_depth (context))
3708 ? current_template_parms
3710 if (field && duplicate_decls (decl, field))
3714 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3715 DECL_IN_AGGR_P (decl) = 0;
3716 if ((DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3717 || CLASSTYPE_TEMPLATE_INSTANTIATION (context))
3719 /* Do not mark DECL as an explicit specialization if it was
3720 not already marked as an instantiation; a declaration
3721 should never be marked as a specialization unless we know
3722 what template is being specialized. */
3723 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3724 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3725 /* [temp.expl.spec] An explicit specialization of a static data
3726 member of a template is a definition if the declaration
3727 includes an initializer; otherwise, it is a declaration.
3729 We check for processing_specialization so this only applies
3730 to the new specialization syntax. */
3731 if (DECL_INITIAL (decl) == NULL_TREE && processing_specialization)
3732 DECL_EXTERNAL (decl) = 1;
3735 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3736 pedwarn ("declaration of %q#D outside of class is not definition",
3740 /* Enter this declaration into the symbol table. */
3741 tem = maybe_push_decl (decl);
3743 if (processing_template_decl)
3744 tem = push_template_decl (tem);
3745 if (tem == error_mark_node)
3746 return error_mark_node;
3748 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3749 /* Tell the back-end to use or not use .common as appropriate. If we say
3750 -fconserve-space, we want this to save .data space, at the expense of
3751 wrong semantics. If we say -fno-conserve-space, we want this to
3752 produce errors about redefs; to do this we force variables into the
3754 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3755 || !DECL_THREAD_LOCAL (tem))
3756 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3759 if (! processing_template_decl)
3766 start_decl_1 (tree decl)
3768 tree type = TREE_TYPE (decl);
3769 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3771 if (type == error_mark_node)
3775 /* Is it valid for this decl to have an initializer at all?
3776 If not, set INITIALIZED to zero, which will indirectly
3777 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3779 /* Don't allow initializations for incomplete types except for
3780 arrays which might be completed by the initialization. */
3781 if (COMPLETE_TYPE_P (complete_type (type)))
3782 ; /* A complete type is ok. */
3783 else if (TREE_CODE (type) != ARRAY_TYPE)
3785 error ("variable %q#D has initializer but incomplete type", decl);
3787 type = TREE_TYPE (decl) = error_mark_node;
3789 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3791 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3792 error ("elements of array %q#D have incomplete type", decl);
3793 /* else we already gave an error in start_decl. */
3799 && TREE_CODE (decl) != TYPE_DECL
3800 && TREE_CODE (decl) != TEMPLATE_DECL
3801 && type != error_mark_node
3802 && IS_AGGR_TYPE (type)
3803 && ! DECL_EXTERNAL (decl))
3805 if ((! processing_template_decl || ! uses_template_parms (type))
3806 && !COMPLETE_TYPE_P (complete_type (type)))
3808 error ("aggregate %q#D has incomplete type and cannot be defined",
3810 /* Change the type so that assemble_variable will give
3811 DECL an rtl we can live with: (mem (const_int 0)). */
3812 type = TREE_TYPE (decl) = error_mark_node;
3816 /* If any base type in the hierarchy of TYPE needs a constructor,
3817 then we set initialized to 1. This way any nodes which are
3818 created for the purposes of initializing this aggregate
3819 will live as long as it does. This is necessary for global
3820 aggregates which do not have their initializers processed until
3821 the end of the file. */
3822 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3827 DECL_INITIAL (decl) = NULL_TREE;
3829 /* Create a new scope to hold this declaration if necessary.
3830 Whether or not a new scope is necessary cannot be determined
3831 until after the type has been completed; if the type is a
3832 specialization of a class template it is not until after
3833 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3834 will be set correctly. */
3835 maybe_push_cleanup_level (type);
3838 /* Handle initialization of references. DECL, TYPE, and INIT have the
3839 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3840 but will be set to a new CLEANUP_STMT if a temporary is created
3841 that must be destroyed subsequently.
3843 Returns an initializer expression to use to initialize DECL, or
3844 NULL if the initialization can be performed statically.
3846 Quotes on semantics can be found in ARM 8.4.3. */
3849 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3853 if (init == NULL_TREE)
3855 if ((DECL_LANG_SPECIFIC (decl) == 0
3856 || DECL_IN_AGGR_P (decl) == 0)
3857 && ! DECL_THIS_EXTERN (decl))
3858 error ("%qD declared as reference but not initialized", decl);
3862 if (TREE_CODE (init) == CONSTRUCTOR)
3864 error ("ISO C++ forbids use of initializer list to "
3865 "initialize reference %qD", decl);
3869 if (TREE_CODE (init) == TREE_LIST)
3870 init = build_x_compound_expr_from_list (init, "initializer");
3872 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3873 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3874 /* Note: default conversion is only called in very special cases. */
3875 init = decay_conversion (init);
3877 /* Convert INIT to the reference type TYPE. This may involve the
3878 creation of a temporary, whose lifetime must be the same as that
3879 of the reference. If so, a DECL_EXPR for the temporary will be
3880 added just after the DECL_EXPR for DECL. That's why we don't set
3881 DECL_INITIAL for local references (instead assigning to them
3882 explicitly); we need to allow the temporary to be initialized
3884 tmp = initialize_reference (type, init, decl, cleanup);
3886 if (tmp == error_mark_node)
3888 else if (tmp == NULL_TREE)
3890 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3894 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3897 DECL_INITIAL (decl) = tmp;
3902 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3903 array until we finish parsing the initializer. If that's the
3904 situation we're in, update DECL accordingly. */
3907 maybe_deduce_size_from_array_init (tree decl, tree init)
3909 tree type = TREE_TYPE (decl);
3911 if (TREE_CODE (type) == ARRAY_TYPE
3912 && TYPE_DOMAIN (type) == NULL_TREE
3913 && TREE_CODE (decl) != TYPE_DECL)
3915 /* do_default is really a C-ism to deal with tentative definitions.
3916 But let's leave it here to ease the eventual merge. */
3917 int do_default = !DECL_EXTERNAL (decl);
3918 tree initializer = init ? init : DECL_INITIAL (decl);
3919 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
3923 error ("initializer fails to determine size of %qD", decl);
3928 error ("array size missing in %qD", decl);
3929 /* If a `static' var's size isn't known, make it extern as
3930 well as static, so it does not get allocated. If it's not
3931 `static', then don't mark it extern; finish_incomplete_decl
3932 will give it a default size and it will get allocated. */
3933 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3934 DECL_EXTERNAL (decl) = 1;
3938 error ("zero-size array %qD", decl);
3940 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
3942 layout_decl (decl, 0);
3946 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
3947 any appropriate error messages regarding the layout. */
3950 layout_var_decl (tree decl)
3952 tree type = TREE_TYPE (decl);
3954 /* If we haven't already layed out this declaration, do so now.
3955 Note that we must not call complete type for an external object
3956 because it's type might involve templates that we are not
3957 supposed to instantiate yet. (And it's perfectly valid to say
3958 `extern X x' for some incomplete type `X'.) */
3959 if (!DECL_EXTERNAL (decl))
3960 complete_type (type);
3961 if (!DECL_SIZE (decl)
3962 && TREE_TYPE (decl) != error_mark_node
3963 && (COMPLETE_TYPE_P (type)
3964 || (TREE_CODE (type) == ARRAY_TYPE
3965 && !TYPE_DOMAIN (type)
3966 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
3967 layout_decl (decl, 0);
3969 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
3971 /* An automatic variable with an incomplete type: that is an error.
3972 Don't talk about array types here, since we took care of that
3973 message in grokdeclarator. */
3974 error ("storage size of %qD isn't known", decl);
3975 TREE_TYPE (decl) = error_mark_node;
3978 /* Keep this code around in case we later want to control debug info
3979 based on whether a type is "used". (jason 1999-11-11) */
3981 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
3982 /* Let debugger know it should output info for this type. */
3983 note_debug_info_needed (ttype);
3985 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
3986 note_debug_info_needed (DECL_CONTEXT (decl));
3989 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3990 && DECL_SIZE (decl) != NULL_TREE
3991 && ! TREE_CONSTANT (DECL_SIZE (decl)))
3993 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3994 constant_expression_warning (DECL_SIZE (decl));
3996 error ("storage size of %qD isn't constant", decl);
3999 if (TREE_STATIC (decl)
4000 && !DECL_ARTIFICIAL (decl)
4001 && current_function_decl
4002 && DECL_CONTEXT (decl) == current_function_decl)
4003 push_local_name (decl);
4006 /* If a local static variable is declared in an inline function, or if
4007 we have a weak definition, we must endeavor to create only one
4008 instance of the variable at link-time. */
4011 maybe_commonize_var (tree decl)
4013 /* Static data in a function with comdat linkage also has comdat
4015 if (TREE_STATIC (decl)
4016 /* Don't mess with __FUNCTION__. */
4017 && ! DECL_ARTIFICIAL (decl)
4018 && DECL_FUNCTION_SCOPE_P (decl)
4019 /* Unfortunately, import_export_decl has not always been called
4020 before the function is processed, so we cannot simply check
4022 && (DECL_COMDAT (DECL_CONTEXT (decl))
4023 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4024 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4025 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4029 /* With weak symbols, we simply make the variable COMDAT;
4030 that will cause copies in multiple translations units to
4032 comdat_linkage (decl);
4036 if (DECL_INITIAL (decl) == NULL_TREE
4037 || DECL_INITIAL (decl) == error_mark_node)
4039 /* Without weak symbols, we can use COMMON to merge
4040 uninitialized variables. */
4041 TREE_PUBLIC (decl) = 1;
4042 DECL_COMMON (decl) = 1;
4046 /* While for initialized variables, we must use internal
4047 linkage -- which means that multiple copies will not
4049 TREE_PUBLIC (decl) = 0;
4050 DECL_COMMON (decl) = 0;
4051 cp_warning_at ("sorry: semantics of inline function static "
4052 "data %q#D are wrong (you'll wind up "
4053 "with multiple copies)", decl);
4054 warning (0, "%J you can work around this by removing "
4060 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4061 /* Set it up again; we might have set DECL_INITIAL since the last
4063 comdat_linkage (decl);
4066 /* Issue an error message if DECL is an uninitialized const variable. */
4069 check_for_uninitialized_const_var (tree decl)
4071 tree type = TREE_TYPE (decl);
4073 /* ``Unless explicitly declared extern, a const object does not have
4074 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4076 if (TREE_CODE (decl) == VAR_DECL
4077 && TREE_CODE (type) != REFERENCE_TYPE
4078 && CP_TYPE_CONST_P (type)
4079 && !TYPE_NEEDS_CONSTRUCTING (type)
4080 && !DECL_INITIAL (decl))
4081 error ("uninitialized const %qD", decl);
4084 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4085 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4086 initialized. If there are no more such fields, the return value
4090 next_initializable_field (tree field)
4093 && (TREE_CODE (field) != FIELD_DECL
4094 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4095 || DECL_ARTIFICIAL (field)))
4096 field = TREE_CHAIN (field);
4101 /* Subroutine of reshape_init. Reshape the constructor for an array. INITP
4102 is the pointer to the old constructor list (to the CONSTRUCTOR_ELTS of
4103 the CONSTRUCTOR we are processing), while NEW_INIT is the CONSTRUCTOR we
4105 ELT_TYPE is the element type of the array. MAX_INDEX is an INTEGER_CST
4106 representing the size of the array minus one (the maximum index), or
4107 NULL_TREE if the array was declared without specifying the size. */
4110 reshape_init_array (tree elt_type, tree max_index,
4111 tree *initp, tree new_init)
4113 bool sized_array_p = (max_index != NULL_TREE);
4114 unsigned HOST_WIDE_INT max_index_cst = 0;
4115 unsigned HOST_WIDE_INT index;
4119 if (host_integerp (max_index, 1))
4120 max_index_cst = tree_low_cst (max_index, 1);
4121 /* sizetype is sign extended, not zero extended. */
4123 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4127 /* Loop until there are no more initializers. */
4129 *initp && (!sized_array_p || index <= max_index_cst);
4133 tree designated_index;
4135 element_init = reshape_init (elt_type, initp);
4136 if (element_init == error_mark_node)
4138 TREE_CHAIN (element_init) = CONSTRUCTOR_ELTS (new_init);
4139 CONSTRUCTOR_ELTS (new_init) = element_init;
4140 designated_index = TREE_PURPOSE (element_init);
4141 if (designated_index)
4143 /* Handle array designated initializers (GNU extension). */
4144 if (TREE_CODE (designated_index) == IDENTIFIER_NODE)
4146 error ("name %qD used in a GNU-style designated "
4147 "initializer for an array", designated_index);
4148 TREE_PURPOSE (element_init) = NULL_TREE;
4158 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4159 brace-enclosed aggregate initializer.
4161 *INITP is one of a list of initializers describing a brace-enclosed
4162 initializer for an entity of the indicated aggregate TYPE. It may
4163 not presently match the shape of the TYPE; for example:
4165 struct S { int a; int b; };
4166 struct S a[] = { 1, 2, 3, 4 };
4168 Here *INITP will point to TREE_LIST of four elements, rather than a
4169 list of two elements, each itself a list of two elements. This
4170 routine transforms INIT from the former form into the latter. The
4171 revised initializer is returned. */
4174 reshape_init (tree type, tree *initp)
4178 tree old_init_value;
4180 bool brace_enclosed_p;
4184 old_init_value = (TREE_CODE (*initp) == TREE_LIST
4185 ? TREE_VALUE (*initp) : old_init);
4187 gcc_assert (old_init_value);
4189 /* If the initializer is brace-enclosed, pull initializers from the
4190 enclosed elements. Advance past the brace-enclosed initializer
4192 if (TREE_CODE (old_init_value) == CONSTRUCTOR
4193 && BRACE_ENCLOSED_INITIALIZER_P (old_init_value))
4195 *initp = TREE_CHAIN (old_init);
4196 TREE_CHAIN (old_init) = NULL_TREE;
4197 inits = CONSTRUCTOR_ELTS (old_init_value);
4199 brace_enclosed_p = true;
4204 brace_enclosed_p = false;
4207 /* A non-aggregate type is always initialized with a single
4209 if (!CP_AGGREGATE_TYPE_P (type))
4211 *initp = TREE_CHAIN (old_init);
4212 TREE_CHAIN (old_init) = NULL_TREE;
4213 /* It is invalid to initialize a non-aggregate type with a
4214 brace-enclosed initializer. */
4215 if (brace_enclosed_p)
4217 error ("brace-enclosed initializer used to initialize %qT",
4219 if (TREE_CODE (old_init) == TREE_LIST)
4220 TREE_VALUE (old_init) = error_mark_node;
4222 old_init = error_mark_node;
4230 All implicit type conversions (clause _conv_) are considered when
4231 initializing the aggregate member with an initializer from an
4232 initializer-list. If the initializer can initialize a member,
4233 the member is initialized. Otherwise, if the member is itself a
4234 non-empty subaggregate, brace elision is assumed and the
4235 initializer is considered for the initialization of the first
4236 member of the subaggregate. */
4237 if (!brace_enclosed_p
4238 && can_convert_arg (type, TREE_TYPE (old_init_value), old_init_value))
4240 *initp = TREE_CHAIN (old_init);
4241 TREE_CHAIN (old_init) = NULL_TREE;
4245 string_init_p = false;
4246 if (TREE_CODE (old_init_value) == STRING_CST
4247 && TREE_CODE (type) == ARRAY_TYPE
4248 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4250 /* [dcl.init.string]
4252 A char array (whether plain char, signed char, or unsigned char)
4253 can be initialized by a string-literal (optionally enclosed in
4254 braces); a wchar_t array can be initialized by a wide
4255 string-literal (optionally enclosed in braces). */
4256 new_init = old_init;
4257 /* Move past the initializer. */
4258 *initp = TREE_CHAIN (old_init);
4259 TREE_CHAIN (old_init) = NULL_TREE;
4260 string_init_p = true;
4264 /* Build a CONSTRUCTOR to hold the contents of the aggregate. */
4265 new_init = build_constructor (NULL_TREE, NULL_TREE);
4267 if (CLASS_TYPE_P (type))
4271 field = next_initializable_field (TYPE_FIELDS (type));
4277 An initializer for an aggregate member that is an
4278 empty class shall have the form of an empty
4279 initializer-list {}. */
4280 if (!brace_enclosed_p)
4282 error ("initializer for %qT must be brace-enclosed", type);
4283 return error_mark_node;
4288 /* Loop through the initializable fields, gathering
4294 /* Handle designated initializers, as an extension. */
4295 if (TREE_PURPOSE (*initp))
4298 pedwarn ("ISO C++ does not allow designated initializers");
4299 field = lookup_field_1 (type, TREE_PURPOSE (*initp),
4300 /*want_type=*/false);
4301 if (!field || TREE_CODE (field) != FIELD_DECL)
4302 error ("%qT has no non-static data member named %qD",
4303 type, TREE_PURPOSE (*initp));
4308 field_init = reshape_init (TREE_TYPE (field), initp);
4309 if (field_init == error_mark_node)
4310 return error_mark_node;
4311 TREE_CHAIN (field_init) = CONSTRUCTOR_ELTS (new_init);
4312 CONSTRUCTOR_ELTS (new_init) = field_init;
4315 When a union is initialized with a brace-enclosed
4316 initializer, the braces shall only contain an
4317 initializer for the first member of the union. */
4318 if (TREE_CODE (type) == UNION_TYPE)
4320 field = next_initializable_field (TREE_CHAIN (field));
4324 else if (TREE_CODE (type) == ARRAY_TYPE
4325 || TREE_CODE (type) == VECTOR_TYPE)
4327 /* If the bound of the array is known, take no more initializers
4328 than are allowed. */
4329 tree max_index = NULL_TREE;
4330 if (TREE_CODE (type) == ARRAY_TYPE)
4332 if (TYPE_DOMAIN (type))
4333 max_index = array_type_nelts (type);
4337 /* For a vector, the representation type is a struct
4338 containing a single member which is an array of the
4339 appropriate size. */
4340 tree rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4341 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4342 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS
4346 if (!reshape_init_array (TREE_TYPE (type), max_index,
4348 return error_mark_node;
4353 /* The initializers were placed in reverse order in the
4355 CONSTRUCTOR_ELTS (new_init) = nreverse (CONSTRUCTOR_ELTS (new_init));
4357 if (TREE_CODE (old_init) == TREE_LIST)
4358 new_init = build_tree_list (TREE_PURPOSE (old_init), new_init);
4361 /* If there are more initializers than necessary, issue a
4365 if (brace_enclosed_p)
4366 error ("too many initializers for %qT", type);
4367 else if (warn_missing_braces && !string_init_p)
4368 warning (0, "missing braces around initializer");
4374 /* Verify INIT (the initializer for DECL), and record the
4375 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4376 grok_reference_init.
4378 If the return value is non-NULL, it is an expression that must be
4379 evaluated dynamically to initialize DECL. */
4382 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4384 tree type = TREE_TYPE (decl);
4385 tree init_code = NULL;
4387 /* If `start_decl' didn't like having an initialization, ignore it now. */
4388 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4391 /* If an initializer is present, DECL_INITIAL has been
4392 error_mark_node, to indicate that an as-of-yet unevaluated
4393 initialization will occur. From now on, DECL_INITIAL reflects
4394 the static initialization -- if any -- of DECL. */
4395 DECL_INITIAL (decl) = NULL_TREE;
4397 /* Things that are going to be initialized need to have complete
4399 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4401 if (type == error_mark_node)
4402 /* We will have already complained. */
4404 else if (init && COMPLETE_TYPE_P (type)
4405 && !TREE_CONSTANT (TYPE_SIZE (type)))
4407 error ("variable-sized object %qD may not be initialized", decl);
4410 else if (TREE_CODE (type) == ARRAY_TYPE
4411 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4413 error ("elements of array %q#D have incomplete type", decl);
4416 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4418 error ("%qD has incomplete type", decl);
4419 TREE_TYPE (decl) = error_mark_node;
4423 if (TREE_CODE (decl) == CONST_DECL)
4425 gcc_assert (TREE_CODE (decl) != REFERENCE_TYPE);
4427 DECL_INITIAL (decl) = init;
4429 gcc_assert (init != NULL_TREE);
4432 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4433 init = grok_reference_init (decl, type, init, cleanup);
4436 if (TREE_CODE (init) == CONSTRUCTOR
4437 && BRACE_ENCLOSED_INITIALIZER_P (init))
4439 /* [dcl.init] paragraph 13,
4440 If T is a scalar type, then a declaration of the form
4445 reshape_init will complain about the extra braces,
4446 and doesn't do anything useful in the case where TYPE is
4447 scalar, so just don't call it. */
4448 if (CP_AGGREGATE_TYPE_P (type))
4449 init = reshape_init (type, &init);
4451 if ((*targetm.vector_opaque_p) (type))
4453 error ("opaque vector types cannot be initialized");
4454 init = error_mark_node;
4458 /* If DECL has an array type without a specific bound, deduce the
4459 array size from the initializer. */
4460 maybe_deduce_size_from_array_init (decl, init);
4461 type = TREE_TYPE (decl);
4463 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4465 if (TREE_CODE (type) == ARRAY_TYPE)
4466 goto initialize_aggr;
4467 else if (TREE_CODE (init) == CONSTRUCTOR
4468 && BRACE_ENCLOSED_INITIALIZER_P (init))
4470 if (TYPE_NON_AGGREGATE_CLASS (type))
4472 error ("%qD must be initialized by constructor, "
4475 init = error_mark_node;
4478 goto dont_use_constructor;
4482 int saved_stmts_are_full_exprs_p;
4485 saved_stmts_are_full_exprs_p = 0;
4486 if (building_stmt_tree ())
4488 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4489 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4491 init = build_aggr_init (decl, init, flags);
4492 if (building_stmt_tree ())
4493 current_stmt_tree ()->stmts_are_full_exprs_p =
4494 saved_stmts_are_full_exprs_p;
4500 dont_use_constructor:
4501 if (TREE_CODE (init) != TREE_VEC)
4503 init_code = store_init_value (decl, init);
4504 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4505 && DECL_INITIAL (decl)
4506 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4507 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4508 warning (0, "array %qD initialized by parenthesized string literal %qE",
4509 decl, DECL_INITIAL (decl));
4514 else if (DECL_EXTERNAL (decl))
4516 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4517 goto initialize_aggr;
4518 else if (IS_AGGR_TYPE (type))
4520 tree core_type = strip_array_types (type);
4522 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4523 error ("structure %qD with uninitialized const members", decl);
4524 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4525 error ("structure %qD with uninitialized reference members", decl);
4527 check_for_uninitialized_const_var (decl);
4530 check_for_uninitialized_const_var (decl);
4532 if (init && init != error_mark_node)
4533 init_code = build2 (INIT_EXPR, type, decl, init);
4538 /* If DECL is not a local variable, give it RTL. */
4541 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4543 int toplev = toplevel_bindings_p ();
4545 const char *filename;
4547 /* Set the DECL_ASSEMBLER_NAME for the object. */
4550 /* The `register' keyword, when used together with an
4551 asm-specification, indicates that the variable should be
4552 placed in a particular register. */
4553 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4555 change_decl_assembler_name (decl, get_identifier (asmspec));
4556 DECL_HARD_REGISTER (decl) = 1;
4560 if (TREE_CODE (decl) == FUNCTION_DECL
4561 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4562 set_builtin_user_assembler_name (decl, asmspec);
4563 set_user_assembler_name (decl, asmspec);
4567 /* Handle non-variables up front. */
4568 if (TREE_CODE (decl) != VAR_DECL)
4570 rest_of_decl_compilation (decl, toplev, at_eof);
4574 /* If we see a class member here, it should be a static data
4576 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4578 gcc_assert (TREE_STATIC (decl));
4579 /* An in-class declaration of a static data member should be
4580 external; it is only a declaration, and not a definition. */
4581 if (init == NULL_TREE)
4582 gcc_assert (DECL_EXTERNAL (decl));
4585 /* We don't create any RTL for local variables. */
4586 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4589 /* We defer emission of local statics until the corresponding
4590 DECL_EXPR is expanded. */
4591 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4593 /* We try to defer namespace-scope static constants so that they are
4594 not emitted into the object file unnecessarily. */
4595 filename = input_filename;
4596 if (!DECL_VIRTUAL_P (decl)
4597 && TREE_READONLY (decl)
4598 && DECL_INITIAL (decl) != NULL_TREE
4599 && DECL_INITIAL (decl) != error_mark_node
4601 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4603 && !TREE_PUBLIC (decl))
4605 /* Fool with the linkage of static consts according to #pragma
4607 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4608 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4610 TREE_PUBLIC (decl) = 1;
4611 DECL_EXTERNAL (decl) = finfo->interface_only;
4616 /* Likewise for template instantiations. */
4617 else if (DECL_LANG_SPECIFIC (decl)
4618 && DECL_IMPLICIT_INSTANTIATION (decl))
4621 /* If we're not deferring, go ahead and assemble the variable. */
4623 rest_of_decl_compilation (decl, toplev, at_eof);
4626 /* Generate code to initialize DECL (a local variable). */
4629 initialize_local_var (tree decl, tree init)
4631 tree type = TREE_TYPE (decl);
4634 gcc_assert (TREE_CODE (decl) == VAR_DECL
4635 || TREE_CODE (decl) == RESULT_DECL);
4636 gcc_assert (!TREE_STATIC (decl));
4638 if (DECL_SIZE (decl) == NULL_TREE)
4640 /* If we used it already as memory, it must stay in memory. */
4641 DECL_INITIAL (decl) = NULL_TREE;
4642 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4645 if (DECL_SIZE (decl) && type != error_mark_node)
4649 /* Compute and store the initial value. */
4650 already_used = TREE_USED (decl) || TREE_USED (type);
4652 /* Perform the initialization. */
4655 int saved_stmts_are_full_exprs_p;
4657 gcc_assert (building_stmt_tree ());
4658 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4659 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4660 finish_expr_stmt (init);
4661 current_stmt_tree ()->stmts_are_full_exprs_p =
4662 saved_stmts_are_full_exprs_p;
4665 /* Set this to 0 so we can tell whether an aggregate which was
4666 initialized was ever used. Don't do this if it has a
4667 destructor, so we don't complain about the 'resource
4668 allocation is initialization' idiom. Now set
4669 attribute((unused)) on types so decls of that type will be
4670 marked used. (see TREE_USED, above.) */
4671 if (TYPE_NEEDS_CONSTRUCTING (type)
4673 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4674 && DECL_NAME (decl))
4675 TREE_USED (decl) = 0;
4676 else if (already_used)
4677 TREE_USED (decl) = 1;
4680 /* Generate a cleanup, if necessary. */
4681 cleanup = cxx_maybe_build_cleanup (decl);
4682 if (DECL_SIZE (decl) && cleanup)
4683 finish_decl_cleanup (decl, cleanup);
4686 /* DECL is a VAR_DECL for a compiler-generated variable with static
4687 storage duration (like a virtual table) whose initializer is a
4688 compile-time constant. Initialize the variable and provide it to
4692 initialize_artificial_var (tree decl, tree init)
4694 DECL_INITIAL (decl) = build_constructor (NULL_TREE, init);
4695 DECL_INITIALIZED_P (decl) = 1;
4696 determine_visibility (decl);
4697 layout_var_decl (decl);
4698 maybe_commonize_var (decl);
4699 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4702 /* Finish processing of a declaration;
4703 install its line number and initial value.
4704 If the length of an array type is not known before,
4705 it must be determined now, from the initial value, or it is an error.
4707 INIT holds the value of an initializer that should be allowed to escape
4710 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4711 if the (init) syntax was used. */
4714 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4718 const char *asmspec = NULL;
4719 int was_readonly = 0;
4720 bool var_definition_p = false;
4722 if (decl == error_mark_node)
4727 error ("assignment (not initialization) in declaration");
4731 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4733 /* Assume no cleanup is required. */
4734 cleanup = NULL_TREE;
4736 /* If a name was specified, get the string. */
4737 if (global_scope_p (current_binding_level))
4738 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4740 asmspec = TREE_STRING_POINTER (asmspec_tree);
4742 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4744 error ("cannot initialize %qD to namespace %qD", decl, init);
4748 if (current_class_type
4749 && CP_DECL_CONTEXT (decl) == current_class_type
4750 && TYPE_BEING_DEFINED (current_class_type)
4751 && (DECL_INITIAL (decl) || init))
4752 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4754 type = TREE_TYPE (decl);
4756 if (type == error_mark_node)
4759 if (processing_template_decl)
4761 /* Add this declaration to the statement-tree. */
4762 if (at_function_scope_p ())
4763 add_decl_expr (decl);
4765 if (init && DECL_INITIAL (decl))
4766 DECL_INITIAL (decl) = init;
4767 if (TREE_CODE (decl) == VAR_DECL
4768 && !DECL_PRETTY_FUNCTION_P (decl)
4769 && !dependent_type_p (TREE_TYPE (decl)))
4770 maybe_deduce_size_from_array_init (decl, init);
4775 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4776 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4778 /* Take care of TYPE_DECLs up front. */
4779 if (TREE_CODE (decl) == TYPE_DECL)
4781 if (type != error_mark_node
4782 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4784 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4785 warning (0, "shadowing previous type declaration of %q#D", decl);
4786 set_identifier_type_value (DECL_NAME (decl), decl);
4789 /* If we have installed this as the canonical typedef for this
4790 type, and that type has not been defined yet, delay emitting
4791 the debug information for it, as we will emit it later. */
4792 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4793 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4794 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4796 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4801 /* A reference will be modified here, as it is initialized. */
4802 if (! DECL_EXTERNAL (decl)
4803 && TREE_READONLY (decl)
4804 && TREE_CODE (type) == REFERENCE_TYPE)
4807 TREE_READONLY (decl) = 0;
4810 if (TREE_CODE (decl) == VAR_DECL)
4812 /* Only PODs can have thread-local storage. Other types may require
4813 various kinds of non-trivial initialization. */
4814 if (DECL_THREAD_LOCAL (decl) && !pod_type_p (TREE_TYPE (decl)))
4815 error ("%qD cannot be thread-local because it has non-POD type %qT",
4816 decl, TREE_TYPE (decl));
4817 /* Convert the initializer to the type of DECL, if we have not
4818 already initialized DECL. */
4819 if (!DECL_INITIALIZED_P (decl)
4820 /* If !DECL_EXTERNAL then DECL is being defined. In the
4821 case of a static data member initialized inside the
4822 class-specifier, there can be an initializer even if DECL
4823 is *not* defined. */
4824 && (!DECL_EXTERNAL (decl) || init))
4826 init = check_initializer (decl, init, flags, &cleanup);
4827 /* Thread-local storage cannot be dynamically initialized. */
4828 if (DECL_THREAD_LOCAL (decl) && init)
4830 error ("%qD is thread-local and so cannot be dynamically "
4831 "initialized", decl);
4838 The memory occupied by any object of static storage
4839 duration is zero-initialized at program startup before
4840 any other initialization takes place.
4842 We cannot create an appropriate initializer until after
4843 the type of DECL is finalized. If DECL_INITIAL is set,
4844 then the DECL is statically initialized, and any
4845 necessary zero-initialization has already been performed. */
4846 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
4847 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
4848 /*nelts=*/NULL_TREE,
4849 /*static_storage_p=*/true);
4850 /* Remember that the initialization for this variable has
4852 DECL_INITIALIZED_P (decl) = 1;
4853 /* This declaration is the definition of this variable,
4854 unless we are initializing a static data member within
4855 the class specifier. */
4856 if (!DECL_EXTERNAL (decl))
4857 var_definition_p = true;
4858 /* The variable is being defined, so determine its
4860 determine_visibility (decl);
4862 /* If the variable has an array type, lay out the type, even if
4863 there is no initializer. It is valid to index through the
4864 array, and we must get TYPE_ALIGN set correctly on the array
4866 else if (TREE_CODE (type) == ARRAY_TYPE)
4870 /* Add this declaration to the statement-tree. This needs to happen
4871 after the call to check_initializer so that the DECL_EXPR for a
4872 reference temp is added before the DECL_EXPR for the reference itself. */
4873 if (at_function_scope_p ())
4874 add_decl_expr (decl);
4876 if (TREE_CODE (decl) == VAR_DECL)
4877 layout_var_decl (decl);
4879 /* Output the assembler code and/or RTL code for variables and functions,
4880 unless the type is an undefined structure or union.
4881 If not, it will get done when the type is completed. */
4882 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4884 if (TREE_CODE (decl) == VAR_DECL)
4885 maybe_commonize_var (decl);
4887 make_rtl_for_nonlocal_decl (decl, init, asmspec);
4889 /* Check for abstractness of the type. Notice that there is no
4890 need to strip array types here since the check for those types
4891 is already done within create_array_type_for_decl. */
4892 if (TREE_CODE (type) == FUNCTION_TYPE
4893 || TREE_CODE (type) == METHOD_TYPE)
4894 abstract_virtuals_error (decl, TREE_TYPE (type));
4896 abstract_virtuals_error (decl, type);
4898 if (TREE_CODE (decl) == FUNCTION_DECL
4899 || TREE_TYPE (decl) == error_mark_node)
4900 /* No initialization required. */
4902 else if (DECL_EXTERNAL (decl)
4903 && ! (DECL_LANG_SPECIFIC (decl)
4904 && DECL_NOT_REALLY_EXTERN (decl)))
4907 DECL_INITIAL (decl) = init;
4911 /* A variable definition. */
4912 if (DECL_FUNCTION_SCOPE_P (decl))
4914 /* Initialize the local variable. */
4915 if (processing_template_decl)
4917 if (init || DECL_INITIAL (decl) == error_mark_node)
4918 DECL_INITIAL (decl) = init;
4920 else if (!TREE_STATIC (decl))
4921 initialize_local_var (decl, init);
4924 /* If a variable is defined, and then a subsequent
4925 definition with external linkage is encountered, we will
4926 get here twice for the same variable. We want to avoid
4927 calling expand_static_init more than once. For variables
4928 that are not static data members, we can call
4929 expand_static_init only when we actually process the
4930 initializer. It is not legal to redeclare a static data
4931 member, so this issue does not arise in that case. */
4932 if (var_definition_p && TREE_STATIC (decl))
4933 expand_static_init (decl, init);
4937 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
4938 reference, insert it in the statement-tree now. */
4940 push_cleanup (decl, cleanup, false);
4945 TREE_READONLY (decl) = 1;
4947 /* If this was marked 'used', be sure it will be output. */
4948 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
4949 mark_decl_referenced (decl);
4952 /* This is here for a midend callback from c-common.c. */
4955 finish_decl (tree decl, tree init, tree asmspec_tree)
4957 cp_finish_decl (decl, init, asmspec_tree, 0);
4960 /* Returns a declaration for a VAR_DECL as if:
4962 extern "C" TYPE NAME;
4964 had been seen. Used to create compiler-generated global
4968 declare_global_var (tree name, tree type)
4972 push_to_top_level ();
4973 decl = build_decl (VAR_DECL, name, type);
4974 TREE_PUBLIC (decl) = 1;
4975 DECL_EXTERNAL (decl) = 1;
4976 DECL_ARTIFICIAL (decl) = 1;
4977 /* If the user has explicitly declared this variable (perhaps
4978 because the code we are compiling is part of a low-level runtime
4979 library), then it is possible that our declaration will be merged
4980 with theirs by pushdecl. */
4981 decl = pushdecl (decl);
4982 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
4983 pop_from_top_level ();
4988 /* Returns a pointer to the `atexit' function. Note that if
4989 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
4990 `__cxa_atexit' function specified in the IA64 C++ ABI. */
4993 get_atexit_node (void)
5000 bool use_aeabi_atexit;
5005 if (flag_use_cxa_atexit)
5007 /* The declaration for `__cxa_atexit' is:
5009 int __cxa_atexit (void (*)(void *), void *, void *)
5011 We build up the argument types and then then function type
5014 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5015 /* First, build the pointer-to-function type for the first
5017 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5018 fn_type = build_function_type (void_type_node, arg_types);
5019 fn_ptr_type = build_pointer_type (fn_type);
5020 /* Then, build the rest of the argument types. */
5021 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5022 if (use_aeabi_atexit)
5024 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5025 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5029 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5030 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5032 /* And the final __cxa_atexit type. */
5033 fn_type = build_function_type (integer_type_node, arg_types);
5034 fn_ptr_type = build_pointer_type (fn_type);
5035 if (use_aeabi_atexit)
5036 name = "__aeabi_atexit";
5038 name = "__cxa_atexit";
5042 /* The declaration for `atexit' is:
5044 int atexit (void (*)());
5046 We build up the argument types and then then function type
5048 fn_type = build_function_type (void_type_node, void_list_node);
5049 fn_ptr_type = build_pointer_type (fn_type);
5050 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5051 /* Build the final atexit type. */
5052 fn_type = build_function_type (integer_type_node, arg_types);
5056 /* Now, build the function declaration. */
5057 push_lang_context (lang_name_c);
5058 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5059 mark_used (atexit_fndecl);
5060 pop_lang_context ();
5061 atexit_node = decay_conversion (atexit_fndecl);
5066 /* Returns the __dso_handle VAR_DECL. */
5069 get_dso_handle_node (void)
5071 if (dso_handle_node)
5072 return dso_handle_node;
5074 /* Declare the variable. */
5075 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5078 return dso_handle_node;
5081 /* Begin a new function with internal linkage whose job will be simply
5082 to destroy some particular variable. */
5084 static GTY(()) int start_cleanup_cnt;
5087 start_cleanup_fn (void)
5094 push_to_top_level ();
5096 /* No need to mangle this. */
5097 push_lang_context (lang_name_c);
5099 /* Build the parameter-types. */
5100 parmtypes = void_list_node;
5101 /* Functions passed to __cxa_atexit take an additional parameter.
5102 We'll just ignore it. After we implement the new calling
5103 convention for destructors, we can eliminate the use of
5104 additional cleanup functions entirely in the -fnew-abi case. */
5105 if (flag_use_cxa_atexit)
5106 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5107 /* Build the function type itself. */
5108 fntype = build_function_type (void_type_node, parmtypes);
5109 /* Build the name of the function. */
5110 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5111 /* Build the function declaration. */
5112 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5113 /* It's a function with internal linkage, generated by the
5115 TREE_PUBLIC (fndecl) = 0;
5116 DECL_ARTIFICIAL (fndecl) = 1;
5117 /* Make the function `inline' so that it is only emitted if it is
5118 actually needed. It is unlikely that it will be inlined, since
5119 it is only called via a function pointer, but we avoid unnecessary
5120 emissions this way. */
5121 DECL_INLINE (fndecl) = 1;
5122 DECL_DECLARED_INLINE_P (fndecl) = 1;
5123 DECL_INTERFACE_KNOWN (fndecl) = 1;
5124 /* Build the parameter. */
5125 if (flag_use_cxa_atexit)
5129 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5130 DECL_CONTEXT (parmdecl) = fndecl;
5131 TREE_USED (parmdecl) = 1;
5132 DECL_ARGUMENTS (fndecl) = parmdecl;
5136 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5138 pop_lang_context ();
5140 return current_function_decl;
5143 /* Finish the cleanup function begun by start_cleanup_fn. */
5146 end_cleanup_fn (void)
5148 expand_or_defer_fn (finish_function (0));
5150 pop_from_top_level ();
5153 /* Generate code to handle the destruction of DECL, an object with
5154 static storage duration. */
5157 register_dtor_fn (tree decl)
5164 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5165 return void_zero_node;
5167 /* Call build_cleanup before we enter the anonymous function so that
5168 any access checks will be done relative to the current scope,
5169 rather than the scope of the anonymous function. */
5170 build_cleanup (decl);
5172 /* Now start the function. */
5173 cleanup = start_cleanup_fn ();
5175 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5176 to the original function, rather than the anonymous one. That
5177 will make the back-end think that nested functions are in use,
5178 which causes confusion. */
5180 push_deferring_access_checks (dk_no_check);
5181 fcall = build_cleanup (decl);
5182 pop_deferring_access_checks ();
5184 /* Create the body of the anonymous function. */
5185 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5186 finish_expr_stmt (fcall);
5187 finish_compound_stmt (compound_stmt);
5190 /* Call atexit with the cleanup function. */
5191 cxx_mark_addressable (cleanup);
5192 mark_used (cleanup);
5193 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5194 if (flag_use_cxa_atexit)
5196 args = tree_cons (NULL_TREE,
5197 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5199 if (targetm.cxx.use_aeabi_atexit ())
5201 args = tree_cons (NULL_TREE, cleanup, args);
5202 args = tree_cons (NULL_TREE, null_pointer_node, args);
5206 args = tree_cons (NULL_TREE, null_pointer_node, args);
5207 args = tree_cons (NULL_TREE, cleanup, args);
5211 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5212 return build_function_call (get_atexit_node (), args);
5215 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5216 is its initializer. Generate code to handle the construction
5217 and destruction of DECL. */
5220 expand_static_init (tree decl, tree init)
5222 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5223 gcc_assert (TREE_STATIC (decl));
5225 /* Some variables require no initialization. */
5227 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5228 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5231 if (DECL_FUNCTION_SCOPE_P (decl))
5233 /* Emit code to perform this initialization but once. */
5234 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5235 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5236 tree guard, guard_addr, guard_addr_list;
5237 tree acquire_fn, release_fn, abort_fn;
5240 /* Emit code to perform this initialization but once. This code
5243 static <type> guard;
5244 if (!guard.first_byte) {
5245 if (__cxa_guard_acquire (&guard)) {
5248 // Do initialization.
5249 flag = true; __cxa_guard_release (&guard);
5250 // Register variable for destruction at end of program.
5252 if (!flag) __cxa_guard_abort (&guard);
5256 Note that the `flag' variable is only set to 1 *after* the
5257 initialization is complete. This ensures that an exception,
5258 thrown during the construction, will cause the variable to
5259 reinitialized when we pass through this code again, as per:
5263 If the initialization exits by throwing an exception, the
5264 initialization is not complete, so it will be tried again
5265 the next time control enters the declaration.
5267 This process should be thread-safe, too; multiple threads
5268 should not be able to initialize the variable more than
5271 /* Create the guard variable. */
5272 guard = get_guard (decl);
5274 /* This optimization isn't safe on targets with relaxed memory
5275 consistency. On such targets we force synchronization in
5276 __cxa_guard_acquire. */
5277 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5279 /* Begin the conditional initialization. */
5280 if_stmt = begin_if_stmt ();
5281 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5282 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5285 if (flag_threadsafe_statics)
5287 guard_addr = build_address (guard);
5288 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5290 acquire_fn = get_identifier ("__cxa_guard_acquire");
5291 release_fn = get_identifier ("__cxa_guard_release");
5292 abort_fn = get_identifier ("__cxa_guard_abort");
5293 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5295 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5297 tree vfntype = build_function_type (void_type_node, argtypes);
5298 acquire_fn = push_library_fn
5299 (acquire_fn, build_function_type (integer_type_node, argtypes));
5300 release_fn = push_library_fn (release_fn, vfntype);
5301 abort_fn = push_library_fn (abort_fn, vfntype);
5305 release_fn = identifier_global_value (release_fn);
5306 abort_fn = identifier_global_value (abort_fn);
5309 inner_if_stmt = begin_if_stmt ();
5310 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5313 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5314 begin = get_target_expr (boolean_false_node);
5315 flag = TARGET_EXPR_SLOT (begin);
5317 TARGET_EXPR_CLEANUP (begin)
5318 = build3 (COND_EXPR, void_type_node, flag,
5320 build_call (abort_fn, guard_addr_list));
5321 CLEANUP_EH_ONLY (begin) = 1;
5323 /* Do the initialization itself. */
5324 init = add_stmt_to_compound (begin, init);
5325 init = add_stmt_to_compound
5326 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5327 init = add_stmt_to_compound
5328 (init, build_call (release_fn, guard_addr_list));
5331 init = add_stmt_to_compound (init, set_guard (guard));
5333 /* Use atexit to register a function for destroying this static
5335 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5337 finish_expr_stmt (init);
5339 if (flag_threadsafe_statics)
5341 finish_compound_stmt (inner_then_clause);
5342 finish_then_clause (inner_if_stmt);
5343 finish_if_stmt (inner_if_stmt);
5346 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5348 finish_compound_stmt (then_clause);
5349 finish_then_clause (if_stmt);
5350 finish_if_stmt (if_stmt);
5354 static_aggregates = tree_cons (init, decl, static_aggregates);
5358 /* Make TYPE a complete type based on INITIAL_VALUE.
5359 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5360 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5361 3 if the initializer list is empty (in pedantic mode). */
5364 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5367 tree type, elt_type;
5371 /* An array of character type can be initialized from a
5372 brace-enclosed string constant. */
5373 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5374 && TREE_CODE (initial_value) == CONSTRUCTOR
5375 && CONSTRUCTOR_ELTS (initial_value)
5376 && (TREE_CODE (TREE_VALUE (CONSTRUCTOR_ELTS (initial_value)))
5378 && TREE_CHAIN (CONSTRUCTOR_ELTS (initial_value)) == NULL_TREE)
5379 initial_value = TREE_VALUE (CONSTRUCTOR_ELTS (initial_value));
5382 failure = complete_array_type (ptype, initial_value, do_default);
5384 /* We can create the array before the element type is complete, which
5385 means that we didn't have these two bits set in the original type
5386 either. In completing the type, we are expected to propagate these
5387 bits. See also complete_type which does the same thing for arrays
5390 if (TYPE_DOMAIN (type))
5392 elt_type = TREE_TYPE (type);
5393 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5394 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5395 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5401 /* Return zero if something is declared to be a member of type
5402 CTYPE when in the context of CUR_TYPE. STRING is the error
5403 message to print in that case. Otherwise, quietly return 1. */
5406 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5408 if (ctype && ctype != cur_type)
5410 if (flags == DTOR_FLAG)
5411 error ("destructor for alien class %qT cannot be a member", ctype);
5413 error ("constructor for alien class %qT cannot be a member", ctype);
5419 /* Subroutine of `grokdeclarator'. */
5421 /* Generate errors possibly applicable for a given set of specifiers.
5422 This is for ARM $7.1.2. */
5425 bad_specifiers (tree object,
5434 error ("%qD declared as a %<virtual%> %s", object, type);
5436 error ("%qD declared as an %<inline%> %s", object, type);
5438 error ("%<const%> and %<volatile%> function specifiers on "
5439 "%qD invalid in %s declaration",
5442 cp_error_at ("%qD declared as a friend", object);
5444 && (TREE_CODE (object) == TYPE_DECL
5445 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5446 && !TYPE_REFFN_P (TREE_TYPE (object))
5447 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5448 cp_error_at ("%qD declared with an exception specification", object);
5451 /* CTYPE is class type, or null if non-class.
5452 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5454 DECLARATOR is the function's name.
5455 PARMS is a chain of PARM_DECLs for the function.
5456 VIRTUALP is truthvalue of whether the function is virtual or not.
5457 FLAGS are to be passed through to `grokclassfn'.
5458 QUALS are qualifiers indicating whether the function is `const'
5460 RAISES is a list of exceptions that this function can raise.
5461 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5462 not look, and -1 if we should not call `grokclassfn' at all.
5464 SFK is the kind of special function (if any) for the new function.
5466 Returns `NULL_TREE' if something goes wrong, after issuing
5467 applicable error messages. */
5470 grokfndecl (tree ctype,
5474 tree orig_declarator,
5476 enum overload_flags flags,
5483 special_function_kind sfk,
5490 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5491 int has_default_arg = 0;
5495 type = build_exception_variant (type, raises);
5497 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5498 DECL_ARGUMENTS (decl) = parms;
5499 /* Propagate volatile out from type to decl. */
5500 if (TYPE_VOLATILE (type))
5501 TREE_THIS_VOLATILE (decl) = 1;
5503 /* If this decl has namespace scope, set that up. */
5505 set_decl_namespace (decl, in_namespace, friendp);
5507 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5509 /* `main' and builtins have implicit 'C' linkage. */
5510 if ((MAIN_NAME_P (declarator)
5511 || (IDENTIFIER_LENGTH (declarator) > 10
5512 && IDENTIFIER_POINTER (declarator)[0] == '_'
5513 && IDENTIFIER_POINTER (declarator)[1] == '_'
5514 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5515 && current_lang_name == lang_name_cplusplus
5516 && ctype == NULL_TREE
5517 /* NULL_TREE means global namespace. */
5518 && DECL_CONTEXT (decl) == NULL_TREE)
5519 SET_DECL_LANGUAGE (decl, lang_c);
5521 /* Should probably propagate const out from type to decl I bet (mrs). */
5524 DECL_STATIC_FUNCTION_P (decl) = 1;
5525 DECL_CONTEXT (decl) = ctype;
5529 DECL_CONTEXT (decl) = ctype;
5531 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5533 if (processing_template_decl)
5534 error ("cannot declare %<::main%> to be a template");
5536 error ("cannot declare %<::main%> to be inline");
5538 error ("cannot declare %<::main%> to be static");
5539 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5542 error ("%<::main%> must return %<int%>");
5543 TREE_TYPE (TREE_TYPE (decl)) = integer_type_node;
5549 /* Members of anonymous types and local classes have no linkage; make
5550 them internal. If a typedef is made later, this will be changed. */
5551 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5552 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5557 /* [basic.link]: A name with no linkage (notably, the name of a class
5558 or enumeration declared in a local scope) shall not be used to
5559 declare an entity with linkage.
5561 Only check this for public decls for now. See core 319, 389. */
5562 t = no_linkage_check (TREE_TYPE (decl),
5563 /*relaxed_p=*/false);
5566 if (TYPE_ANONYMOUS_P (t))
5568 if (DECL_EXTERN_C_P (decl))
5569 /* Allow this; it's pretty common in C. */;
5572 pedwarn ("non-local function %q#D uses anonymous type",
5574 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5575 cp_pedwarn_at ("%q#D does not refer to the unqualified "
5576 "type, so it is not used for linkage",
5581 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5585 TREE_PUBLIC (decl) = publicp;
5588 DECL_INTERFACE_KNOWN (decl) = 1;
5589 DECL_NOT_REALLY_EXTERN (decl) = 1;
5592 /* If the declaration was declared inline, mark it as such. */
5594 DECL_DECLARED_INLINE_P (decl) = 1;
5595 /* We inline functions that are explicitly declared inline, or, when
5596 the user explicitly asks us to, all functions. */
5597 if (DECL_DECLARED_INLINE_P (decl)
5598 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5599 DECL_INLINE (decl) = 1;
5601 DECL_EXTERNAL (decl) = 1;
5602 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5604 error ("%smember function %qD cannot have cv-qualifier",
5605 (ctype ? "static " : "non-"), decl);
5606 quals = TYPE_UNQUALIFIED;
5609 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5610 grok_op_properties (decl, friendp, /*complain=*/true);
5612 if (ctype && decl_function_context (decl))
5613 DECL_NO_STATIC_CHAIN (decl) = 1;
5615 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5616 if (TREE_PURPOSE (t)
5617 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5619 has_default_arg = 1;
5624 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5628 ("defining explicit specialization %qD in friend declaration",
5632 tree fns = TREE_OPERAND (orig_declarator, 0);
5633 tree args = TREE_OPERAND (orig_declarator, 1);
5635 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5637 /* Something like `template <class T> friend void f<T>()'. */
5638 error ("invalid use of template-id %qD in declaration "
5639 "of primary template",
5645 /* A friend declaration of the form friend void f<>(). Record
5646 the information in the TEMPLATE_ID_EXPR. */
5647 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5649 if (TREE_CODE (fns) == COMPONENT_REF)
5651 /* Due to bison parser ickiness, we will have already looked
5652 up an operator_name or PFUNCNAME within the current class
5653 (see template_id in parse.y). If the current class contains
5654 such a name, we'll get a COMPONENT_REF here. Undo that. */
5656 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5657 == current_class_type);
5658 fns = TREE_OPERAND (fns, 1);
5660 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5661 || TREE_CODE (fns) == OVERLOAD);
5662 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5664 if (has_default_arg)
5666 error ("default arguments are not allowed in declaration "
5667 "of friend template specialization %qD",
5674 error ("%<inline%> is not allowed in declaration of friend "
5675 "template specialization %qD",
5683 /* Make the init_value nonzero so pushdecl knows this is not
5684 tentative. error_mark_node is replaced later with the BLOCK. */
5685 DECL_INITIAL (decl) = error_mark_node;
5687 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5688 TREE_NOTHROW (decl) = 1;
5690 /* Caller will do the rest of this. */
5694 if (ctype != NULL_TREE)
5696 if (sfk == sfk_constructor)
5697 DECL_CONSTRUCTOR_P (decl) = 1;
5699 grokclassfn (ctype, decl, flags, quals);
5702 decl = check_explicit_specialization (orig_declarator, decl,
5704 2 * (funcdef_flag != 0) +
5705 4 * (friendp != 0));
5706 if (decl == error_mark_node)
5711 cplus_decl_attributes (&decl, *attrlist, 0);
5712 *attrlist = NULL_TREE;
5715 if (ctype != NULL_TREE
5716 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5721 old_decl = check_classfn (ctype, decl,
5722 (processing_template_decl
5723 > template_class_depth (ctype))
5724 ? current_template_parms
5727 if (old_decl && TREE_CODE (old_decl) == TEMPLATE_DECL)
5728 /* Because grokfndecl is always supposed to return a
5729 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5730 here. We depend on our callers to figure out that its
5731 really a template that's being returned. */
5732 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5734 if (old_decl && DECL_STATIC_FUNCTION_P (old_decl)
5735 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5736 /* Remove the `this' parm added by grokclassfn.
5737 XXX Isn't this done in start_function, too? */
5738 revert_static_member_fn (decl);
5739 if (old_decl && DECL_ARTIFICIAL (old_decl))
5740 error ("definition of implicitly-declared %qD", old_decl);
5747 /* Since we've smashed OLD_DECL to its
5748 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5749 if (TREE_CODE (decl) == TEMPLATE_DECL)
5750 decl = DECL_TEMPLATE_RESULT (decl);
5752 /* Attempt to merge the declarations. This can fail, in
5753 the case of some invalid specialization declarations. */
5754 pushed_scope = push_scope (ctype);
5755 ok = duplicate_decls (decl, old_decl);
5757 pop_scope (pushed_scope);
5760 error ("no %q#D member function declared in class %qT",
5768 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5771 if (ctype == NULL_TREE || check)
5775 DECL_VIRTUAL_P (decl) = 1;
5780 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5781 the linkage that DECL will receive in the object file. */
5784 set_linkage_for_static_data_member (tree decl)
5786 /* A static data member always has static storage duration and
5787 external linkage. Note that static data members are forbidden in
5788 local classes -- the only situation in which a class has
5789 non-external linkage. */
5790 TREE_PUBLIC (decl) = 1;
5791 TREE_STATIC (decl) = 1;
5792 /* For non-template classes, static data members are always put
5793 out in exactly those files where they are defined, just as
5794 with ordinary namespace-scope variables. */
5795 if (!processing_template_decl)
5796 DECL_INTERFACE_KNOWN (decl) = 1;
5799 /* Create a VAR_DECL named NAME with the indicated TYPE.
5801 If SCOPE is non-NULL, it is the class type or namespace containing
5802 the variable. If SCOPE is NULL, the variable should is created in
5803 the innermost enclosings scope. */
5806 grokvardecl (tree type,
5808 const cp_decl_specifier_seq *declspecs,
5814 tree explicit_scope;
5816 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
5818 /* Compute the scope in which to place the variable, but remember
5819 whether or not that scope was explicitly specified by the user. */
5820 explicit_scope = scope;
5823 /* An explicit "extern" specifier indicates a namespace-scope
5825 if (declspecs->storage_class == sc_extern)
5826 scope = current_namespace;
5827 else if (!at_function_scope_p ())
5828 scope = current_scope ();
5832 && (/* If the variable is a namespace-scope variable declared in a
5833 template, we need DECL_LANG_SPECIFIC. */
5834 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
5835 /* Similarly for namespace-scope variables with language linkage
5837 || (TREE_CODE (scope) == NAMESPACE_DECL
5838 && current_lang_name != lang_name_cplusplus)
5839 /* Similarly for static data members. */
5841 decl = build_lang_decl (VAR_DECL, name, type);
5843 decl = build_decl (VAR_DECL, name, type);
5845 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
5846 set_decl_namespace (decl, explicit_scope, 0);
5848 DECL_CONTEXT (decl) = scope;
5850 if (declspecs->storage_class == sc_extern)
5852 DECL_THIS_EXTERN (decl) = 1;
5853 DECL_EXTERNAL (decl) = !initialized;
5856 if (DECL_CLASS_SCOPE_P (decl))
5858 set_linkage_for_static_data_member (decl);
5859 /* This function is only called with out-of-class definitions. */
5860 DECL_EXTERNAL (decl) = 0;
5862 /* At top level, either `static' or no s.c. makes a definition
5863 (perhaps tentative), and absence of `static' makes it public. */
5864 else if (toplevel_bindings_p ())
5866 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
5867 && (DECL_THIS_EXTERN (decl) || ! constp));
5868 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5870 /* Not at top level, only `static' makes a static definition. */
5873 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
5874 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5877 if (declspecs->specs[(int)ds_thread])
5879 if (targetm.have_tls)
5880 DECL_THREAD_LOCAL (decl) = 1;
5882 /* A mere warning is sure to result in improper semantics
5883 at runtime. Don't bother to allow this to compile. */
5884 error ("thread-local storage not supported for this target");
5887 if (TREE_PUBLIC (decl))
5889 /* [basic.link]: A name with no linkage (notably, the name of a class
5890 or enumeration declared in a local scope) shall not be used to
5891 declare an entity with linkage.
5893 Only check this for public decls for now. */
5894 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
5897 if (TYPE_ANONYMOUS_P (t))
5899 if (DECL_EXTERN_C_P (decl))
5900 /* Allow this; it's pretty common in C. */
5904 /* DRs 132, 319 and 389 seem to indicate types with
5905 no linkage can only be used to declare extern "C"
5906 entities. Since it's not always an error in the
5907 ISO C++ 90 Standard, we only issue a warning. */
5908 warning (0, "non-local variable %q#D uses anonymous type",
5910 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5911 cp_warning_at ("%q#D does not refer to the unqualified "
5912 "type, so it is not used for linkage",
5917 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
5921 DECL_INTERFACE_KNOWN (decl) = 1;
5926 /* Create and return a canonical pointer to member function type, for
5927 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
5930 build_ptrmemfunc_type (tree type)
5934 tree unqualified_variant = NULL_TREE;
5936 if (type == error_mark_node)
5939 /* If a canonical type already exists for this type, use it. We use
5940 this method instead of type_hash_canon, because it only does a
5941 simple equality check on the list of field members. */
5943 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
5946 /* Make sure that we always have the unqualified pointer-to-member
5948 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
5950 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
5952 t = make_aggr_type (RECORD_TYPE);
5953 xref_basetypes (t, NULL_TREE);
5955 /* Let the front-end know this is a pointer to member function... */
5956 TYPE_PTRMEMFUNC_FLAG (t) = 1;
5957 /* ... and not really an aggregate. */
5958 SET_IS_AGGR_TYPE (t, 0);
5960 field = build_decl (FIELD_DECL, pfn_identifier, type);
5963 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
5964 TREE_CHAIN (field) = fields;
5967 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
5969 /* Zap out the name so that the back-end will give us the debugging
5970 information for this anonymous RECORD_TYPE. */
5971 TYPE_NAME (t) = NULL_TREE;
5973 /* If this is not the unqualified form of this pointer-to-member
5974 type, set the TYPE_MAIN_VARIANT for this type to be the
5975 unqualified type. Since they are actually RECORD_TYPEs that are
5976 not variants of each other, we must do this manually. */
5977 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
5979 t = build_qualified_type (t, cp_type_quals (type));
5980 TYPE_MAIN_VARIANT (t) = unqualified_variant;
5981 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
5982 TYPE_NEXT_VARIANT (unqualified_variant) = t;
5985 /* Cache this pointer-to-member type so that we can find it again
5987 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
5992 /* Create and return a pointer to data member type. */
5995 build_ptrmem_type (tree class_type, tree member_type)
5997 if (TREE_CODE (member_type) == METHOD_TYPE)
6001 arg_types = TYPE_ARG_TYPES (member_type);
6002 class_type = (cp_build_qualified_type
6004 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6006 = build_method_type_directly (class_type,
6007 TREE_TYPE (member_type),
6008 TREE_CHAIN (arg_types));
6009 return build_ptrmemfunc_type (build_pointer_type (member_type));
6013 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6014 return build_offset_type (class_type, member_type);
6018 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6019 Check to see that the definition is valid. Issue appropriate error
6020 messages. Return 1 if the definition is particularly bad, or 0
6024 check_static_variable_definition (tree decl, tree type)
6026 /* Motion 10 at San Diego: If a static const integral data member is
6027 initialized with an integral constant expression, the initializer
6028 may appear either in the declaration (within the class), or in
6029 the definition, but not both. If it appears in the class, the
6030 member is a member constant. The file-scope definition is always
6032 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6034 error ("invalid in-class initialization of static data member "
6035 "of non-integral type %qT",
6037 /* If we just return the declaration, crashes will sometimes
6038 occur. We therefore return void_type_node, as if this were a
6039 friend declaration, to cause callers to completely ignore
6040 this declaration. */
6043 else if (!CP_TYPE_CONST_P (type))
6044 error ("ISO C++ forbids in-class initialization of non-const "
6045 "static member %qD",
6047 else if (pedantic && !INTEGRAL_TYPE_P (type))
6048 pedwarn ("ISO C++ forbids initialization of member constant "
6049 "%qD of non-integral type %qT", decl, type);
6054 /* Given the SIZE (i.e., number of elements) in an array, compute an
6055 appropriate index type for the array. If non-NULL, NAME is the
6056 name of the thing being declared. */
6059 compute_array_index_type (tree name, tree size)
6061 tree type = TREE_TYPE (size);
6064 /* The array bound must be an integer type. */
6065 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6068 error ("size of array %qD has non-integral type %qT", name, type);
6070 error ("size of array has non-integral type %qT", type);
6071 size = integer_one_node;
6072 type = TREE_TYPE (size);
6075 if (abi_version_at_least (2)
6076 /* We should only handle value dependent expressions specially. */
6077 ? value_dependent_expression_p (size)
6078 /* But for abi-1, we handled all instances in templates. This
6079 effects the manglings produced. */
6080 : processing_template_decl)
6081 return build_index_type (build_min (MINUS_EXPR, sizetype,
6082 size, integer_one_node));
6084 /* The size might be the result of a cast. */
6085 STRIP_TYPE_NOPS (size);
6087 /* It might be a const variable or enumeration constant. */
6088 size = integral_constant_value (size);
6090 /* Normally, the array-bound will be a constant. */
6091 if (TREE_CODE (size) == INTEGER_CST)
6093 /* Check to see if the array bound overflowed. Make that an
6094 error, no matter how generous we're being. */
6095 int old_flag_pedantic_errors = flag_pedantic_errors;
6096 int old_pedantic = pedantic;
6097 pedantic = flag_pedantic_errors = 1;
6098 constant_expression_warning (size);
6099 pedantic = old_pedantic;
6100 flag_pedantic_errors = old_flag_pedantic_errors;
6102 /* An array must have a positive number of elements. */
6103 if (INT_CST_LT (size, integer_zero_node))
6106 error ("size of array %qD is negative", name);
6108 error ("size of array is negative");
6109 size = integer_one_node;
6111 /* As an extension we allow zero-sized arrays. We always allow
6112 them in system headers because glibc uses them. */
6113 else if (integer_zerop (size) && pedantic && !in_system_header)
6116 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6118 pedwarn ("ISO C++ forbids zero-size array");
6121 else if (TREE_CONSTANT (size))
6123 /* `(int) &fn' is not a valid array bound. */
6125 error ("size of array %qD is not an integral constant-expression",
6128 error ("size of array is not an integral constant-expression");
6133 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6135 pedwarn ("ISO C++ forbids variable-size array");
6138 if (processing_template_decl && !TREE_CONSTANT (size))
6139 /* A variable sized array. */
6140 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6143 HOST_WIDE_INT saved_processing_template_decl;
6145 /* Compute the index of the largest element in the array. It is
6146 one less than the number of elements in the array. We save
6147 and restore PROCESSING_TEMPLATE_DECL so that computations in
6148 cp_build_binary_op will be appropriately folded. */
6149 saved_processing_template_decl = processing_template_decl;
6150 processing_template_decl = 0;
6151 itype = cp_build_binary_op (MINUS_EXPR,
6152 cp_convert (ssizetype, size),
6153 cp_convert (ssizetype, integer_one_node));
6154 itype = fold (itype);
6155 processing_template_decl = saved_processing_template_decl;
6157 if (!TREE_CONSTANT (itype))
6158 /* A variable sized array. */
6159 itype = variable_size (itype);
6160 /* Make sure that there was no overflow when creating to a signed
6161 index type. (For example, on a 32-bit machine, an array with
6162 size 2^32 - 1 is too big.) */
6163 else if (TREE_OVERFLOW (itype))
6165 error ("overflow in array dimension");
6166 TREE_OVERFLOW (itype) = 0;
6170 /* Create and return the appropriate index type. */
6171 return build_index_type (itype);
6174 /* Returns the scope (if any) in which the entity declared by
6175 DECLARATOR will be located. If the entity was declared with an
6176 unqualified name, NULL_TREE is returned. */
6179 get_scope_of_declarator (const cp_declarator *declarator)
6181 while (declarator && declarator->kind != cdk_id)
6182 declarator = declarator->declarator;
6184 /* If the declarator-id is a SCOPE_REF, the scope in which the
6185 declaration occurs is the first operand. */
6187 && declarator->u.id.qualifying_scope)
6188 return declarator->u.id.qualifying_scope;
6190 /* Otherwise, the declarator is not a qualified name; the entity will
6191 be declared in the current scope. */
6195 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6196 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6200 create_array_type_for_decl (tree name, tree type, tree size)
6202 tree itype = NULL_TREE;
6203 const char* error_msg;
6205 /* If things have already gone awry, bail now. */
6206 if (type == error_mark_node || size == error_mark_node)
6207 return error_mark_node;
6209 /* Assume that everything will go OK. */
6212 /* There are some types which cannot be array elements. */
6213 switch (TREE_CODE (type))
6216 error_msg = "array of void";
6220 error_msg = "array of functions";
6223 case REFERENCE_TYPE:
6224 error_msg = "array of references";
6228 error_msg = "array of function members";
6235 /* If something went wrong, issue an error-message and return. */
6239 error ("declaration of %qD as %s", name, error_msg);
6241 error ("creating %s", error_msg);
6243 return error_mark_node;
6248 The constant expressions that specify the bounds of the arrays
6249 can be omitted only for the first member of the sequence. */
6250 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6253 error ("declaration of %qD as multidimensional array must "
6254 "have bounds for all dimensions except the first",
6257 error ("multidimensional array must have bounds for all "
6258 "dimensions except the first");
6260 return error_mark_node;
6263 /* Figure out the index type for the array. */
6265 itype = compute_array_index_type (name, size);
6268 T is called the array element type; this type shall not be [...] an
6269 abstract class type. */
6270 abstract_virtuals_error (name, type);
6272 return build_cplus_array_type (type, itype);
6275 /* Check that it's OK to declare a function with the indicated TYPE.
6276 SFK indicates the kind of special function (if any) that this
6277 function is. OPTYPE is the type given in a conversion operator
6278 declaration, or the class type for a constructor/destructor.
6279 Returns the actual return type of the function; that
6280 may be different than TYPE if an error occurs, or for certain
6281 special functions. */
6284 check_special_function_return_type (special_function_kind sfk,
6290 case sfk_constructor:
6292 error ("return type specification for constructor invalid");
6294 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6295 type = build_pointer_type (optype);
6297 type = void_type_node;
6300 case sfk_destructor:
6302 error ("return type specification for destructor invalid");
6303 /* We can't use the proper return type here because we run into
6304 problems with ambiguous bases and covariant returns.
6305 Java classes are left unchanged because (void *) isn't a valid
6306 Java type, and we don't want to change the Java ABI. */
6307 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6308 type = build_pointer_type (void_type_node);
6310 type = void_type_node;
6313 case sfk_conversion:
6314 if (type && !same_type_p (type, optype))
6315 error ("operator %qT declared to return %qT", optype, type);
6317 pedwarn ("return type specified for %<operator %T%>", optype);
6328 /* A variable or data member (whose unqualified name is IDENTIFIER)
6329 has been declared with the indicated TYPE. If the TYPE is not
6330 acceptable, issue an error message and return a type to use for
6331 error-recovery purposes. */
6334 check_var_type (tree identifier, tree type)
6336 if (VOID_TYPE_P (type))
6339 error ("unnamed variable or field declared void");
6340 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6342 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6343 error ("variable or field %qE declared void", identifier);
6346 error ("variable or field declared void");
6347 type = integer_type_node;
6353 /* Given declspecs and a declarator (abstract or otherwise), determine
6354 the name and type of the object declared and construct a DECL node
6357 DECLSPECS is a chain of tree_list nodes whose value fields
6358 are the storage classes and type specifiers.
6360 DECL_CONTEXT says which syntactic context this declaration is in:
6361 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6362 FUNCDEF for a function definition. Like NORMAL but a few different
6363 error messages in each case. Return value may be zero meaning
6364 this definition is too screwy to try to parse.
6365 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6366 handle member functions (which have FIELD context).
6367 Return value may be zero meaning this definition is too screwy to
6369 PARM for a parameter declaration (either within a function prototype
6370 or before a function body). Make a PARM_DECL, or return void_type_node.
6371 CATCHPARM for a parameter declaration before a catch clause.
6372 TYPENAME if for a typename (in a cast or sizeof).
6373 Don't make a DECL node; just return the ..._TYPE node.
6374 FIELD for a struct or union field; make a FIELD_DECL.
6375 BITFIELD for a field with specified width.
6376 INITIALIZED is 1 if the decl has an initializer.
6378 ATTRLIST is a pointer to the list of attributes, which may be NULL
6379 if there are none; *ATTRLIST may be modified if attributes from inside
6380 the declarator should be applied to the declaration.
6382 When this function is called, scoping variables (such as
6383 CURRENT_CLASS_TYPE) should reflect the scope in which the
6384 declaration occurs, not the scope in which the new declaration will
6385 be placed. For example, on:
6389 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6390 should not be `S'. */
6393 grokdeclarator (const cp_declarator *declarator,
6394 const cp_decl_specifier_seq *declspecs,
6395 enum decl_context decl_context,
6399 tree type = NULL_TREE;
6402 int virtualp, explicitp, friendp, inlinep, staticp;
6403 int explicit_int = 0;
6404 int explicit_char = 0;
6405 int defaulted_int = 0;
6406 tree dependant_name = NULL_TREE;
6408 tree typedef_decl = NULL_TREE;
6409 const char *name = NULL;
6410 tree typedef_type = NULL_TREE;
6411 int funcdef_flag = 0;
6412 cp_declarator_kind innermost_code = cdk_error;
6415 /* See the code below that used this. */
6416 tree decl_attr = NULL_TREE;
6419 /* Keep track of what sort of function is being processed
6420 so that we can warn about default return values, or explicit
6421 return values which do not match prescribed defaults. */
6422 special_function_kind sfk = sfk_none;
6424 tree dname = NULL_TREE;
6425 tree ctor_return_type = NULL_TREE;
6426 enum overload_flags flags = NO_SPECIAL;
6427 cp_cv_quals quals = TYPE_UNQUALIFIED;
6428 tree raises = NULL_TREE;
6429 int template_count = 0;
6430 tree returned_attrs = NULL_TREE;
6431 tree parms = NULL_TREE;
6432 const cp_declarator *id_declarator;
6433 /* The unqualified name of the declarator; either an
6434 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6435 tree unqualified_id;
6436 /* The class type, if any, in which this entity is located,
6437 or NULL_TREE if none. Note that this value may be different from
6438 the current class type; for example if an attempt is made to declare
6439 "A::f" inside "B", this value will be "A". */
6440 tree ctype = current_class_type;
6441 /* The NAMESPACE_DECL for the namespace in which this entity is
6442 located. If an unqualified name is used to declare the entity,
6443 this value will be NULL_TREE, even if the entity is located at
6445 tree in_namespace = NULL_TREE;
6447 cp_storage_class storage_class;
6448 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6449 bool type_was_error_mark_node = false;
6451 signed_p = declspecs->specs[(int)ds_signed];
6452 unsigned_p = declspecs->specs[(int)ds_unsigned];
6453 short_p = declspecs->specs[(int)ds_short];
6454 long_p = declspecs->specs[(int)ds_long];
6455 thread_p = declspecs->specs[(int)ds_thread];
6457 if (decl_context == FUNCDEF)
6458 funcdef_flag = 1, decl_context = NORMAL;
6459 else if (decl_context == MEMFUNCDEF)
6460 funcdef_flag = -1, decl_context = FIELD;
6461 else if (decl_context == BITFIELD)
6462 bitfield = 1, decl_context = FIELD;
6464 /* Look inside a declarator for the name being declared
6465 and get it as a string, for an error message. */
6466 for (id_declarator = declarator;
6468 id_declarator = id_declarator->declarator)
6470 if (id_declarator->kind != cdk_id)
6471 innermost_code = id_declarator->kind;
6473 switch (id_declarator->kind)
6476 if (id_declarator->declarator
6477 && id_declarator->declarator->kind == cdk_id)
6479 sfk = id_declarator->declarator->u.id.sfk;
6480 if (sfk == sfk_destructor)
6487 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6488 tree decl = id_declarator->u.id.unqualified_name;
6491 if (qualifying_scope)
6493 if (TYPE_P (qualifying_scope))
6495 ctype = qualifying_scope;
6496 if (innermost_code != cdk_function
6497 && current_class_type
6498 && !UNIQUELY_DERIVED_FROM_P (ctype,
6499 current_class_type))
6501 error ("type %qT is not derived from type %qT",
6502 ctype, current_class_type);
6503 return error_mark_node;
6506 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6507 in_namespace = qualifying_scope;
6509 if (TREE_CODE (decl) == BASELINK)
6510 decl = BASELINK_FUNCTIONS (decl);
6511 if (decl == error_mark_node)
6512 return error_mark_node;
6513 switch (TREE_CODE (decl))
6519 if (innermost_code != cdk_function)
6521 error ("declaration of %qD as non-function", decl);
6522 return error_mark_node;
6524 else if (!qualifying_scope
6525 && !(current_class_type && at_class_scope_p ()))
6527 error ("declaration of %qD as non-member", decl);
6528 return error_mark_node;
6531 type = TREE_OPERAND (decl, 0);
6532 name = IDENTIFIER_POINTER (constructor_name (type));
6536 case TEMPLATE_ID_EXPR:
6538 tree fns = TREE_OPERAND (decl, 0);
6541 if (TREE_CODE (dname) == COMPONENT_REF)
6542 dname = TREE_OPERAND (dname, 1);
6543 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6545 gcc_assert (is_overloaded_fn (dname));
6546 dname = DECL_NAME (get_first_fn (dname));
6551 case IDENTIFIER_NODE:
6552 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6555 if (C_IS_RESERVED_WORD (dname))
6557 error ("declarator-id missing; using reserved word %qD",
6559 name = IDENTIFIER_POINTER (dname);
6561 else if (!IDENTIFIER_TYPENAME_P (dname))
6562 name = IDENTIFIER_POINTER (dname);
6565 gcc_assert (flags == NO_SPECIAL);
6566 flags = TYPENAME_FLAG;
6567 ctor_return_type = TREE_TYPE (dname);
6568 sfk = sfk_conversion;
6569 if (is_typename_at_global_scope (dname))
6570 name = IDENTIFIER_POINTER (dname);
6572 name = "<invalid operator>";
6577 dname = constructor_name (TREE_TYPE (decl));
6578 name = IDENTIFIER_POINTER (dname);
6599 if (id_declarator->kind == cdk_id)
6603 /* A function definition's declarator must have the form of
6604 a function declarator. */
6606 if (funcdef_flag && innermost_code != cdk_function)
6609 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6610 && innermost_code != cdk_function
6611 && ! (ctype && !declspecs->any_specifiers_p))
6613 error ("declaration of %qD as non-function", dname);
6614 return error_mark_node;
6617 /* Anything declared one level down from the top level
6618 must be one of the parameters of a function
6619 (because the body is at least two levels down). */
6621 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6622 by not allowing C++ class definitions to specify their parameters
6623 with xdecls (must be spec.d in the parmlist).
6625 Since we now wait to push a class scope until we are sure that
6626 we are in a legitimate method context, we must set oldcname
6627 explicitly (since current_class_name is not yet alive).
6629 We also want to avoid calling this a PARM if it is in a namespace. */
6631 if (decl_context == NORMAL && !toplevel_bindings_p ())
6633 struct cp_binding_level *b = current_binding_level;
6634 current_binding_level = b->level_chain;
6635 if (current_binding_level != 0 && toplevel_bindings_p ())
6636 decl_context = PARM;
6637 current_binding_level = b;
6641 name = decl_context == PARM ? "parameter" : "type name";
6643 /* If there were multiple types specified in the decl-specifier-seq,
6644 issue an error message. */
6645 if (declspecs->multiple_types_p)
6646 error ("two or more data types in declaration of %qs", name);
6647 /* Extract the basic type from the decl-specifier-seq. */
6648 type = declspecs->type;
6649 if (type == error_mark_node)
6652 type_was_error_mark_node = true;
6654 /* If the entire declaration is itself tagged as deprecated then
6655 suppress reports of deprecated items. */
6656 if (type && TREE_DEPRECATED (type)
6657 && deprecated_state != DEPRECATED_SUPPRESS)
6658 warn_deprecated_use (type);
6659 if (type && TREE_CODE (type) == TYPE_DECL)
6661 typedef_decl = type;
6662 type = TREE_TYPE (typedef_decl);
6664 /* No type at all: default to `int', and set DEFAULTED_INT
6665 because it was not a user-defined typedef. */
6666 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
6668 /* These imply 'int'. */
6669 type = integer_type_node;
6673 explicit_int = declspecs->explicit_int_p;
6674 explicit_char = declspecs->explicit_char_p;
6676 /* Check for repeated decl-specifiers. */
6677 for (ds = ds_first; ds != ds_last; ++ds)
6679 unsigned count = declspecs->specs[(int)ds];
6682 /* The "long" specifier is a special case because of
6687 error ("%<long long long%> is too long for GCC");
6688 else if (pedantic && !in_system_header && warn_long_long)
6689 pedwarn ("ISO C++ does not support %<long long%>");
6693 else if (declspecs->specs[(int)ds] > 1)
6695 static const char *const decl_spec_names[] = {
6711 error ("duplicate %qs", decl_spec_names[(int)ds]);
6716 /* See the code below that used this. */
6718 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6720 typedef_type = type;
6723 if (sfk != sfk_conversion)
6724 ctor_return_type = ctype;
6726 if (sfk != sfk_none)
6727 type = check_special_function_return_type (sfk, type,
6729 else if (type == NULL_TREE)
6735 /* We handle `main' specially here, because 'main () { }' is so
6736 common. With no options, it is allowed. With -Wreturn-type,
6737 it is a warning. It is only an error with -pedantic-errors. */
6738 is_main = (funcdef_flag
6739 && dname && MAIN_NAME_P (dname)
6740 && ctype == NULL_TREE
6741 && in_namespace == NULL_TREE
6742 && current_namespace == global_namespace);
6744 if (type_was_error_mark_node)
6745 /* We've already issued an error, don't complain more. */;
6746 else if (in_system_header || flag_ms_extensions)
6747 /* Allow it, sigh. */;
6748 else if (pedantic || ! is_main)
6749 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6750 else if (warn_return_type)
6751 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6753 type = integer_type_node;
6758 /* Now process the modifiers that were specified
6759 and check for invalid combinations. */
6761 /* Long double is a special combination. */
6762 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6765 type = build_qualified_type (long_double_type_node,
6766 cp_type_quals (type));
6769 /* Check all other uses of type modifiers. */
6771 if (unsigned_p || signed_p || long_p || short_p)
6775 if (TREE_CODE (type) == REAL_TYPE)
6776 error ("short, signed or unsigned invalid for %qs", name);
6777 else if (TREE_CODE (type) != INTEGER_TYPE)
6778 error ("long, short, signed or unsigned invalid for %qs", name);
6779 else if (long_p && short_p)
6780 error ("long and short specified together for %qs", name);
6781 else if ((long_p || short_p) && explicit_char)
6782 error ("long or short specified with char for %qs", name);
6783 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6784 error ("long or short specified with floating type for %qs", name);
6785 else if (signed_p && unsigned_p)
6786 error ("signed and unsigned given together for %qs", name);
6790 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6792 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
6794 if (flag_pedantic_errors)
6799 /* Discard the type modifiers if they are invalid. */
6810 /* Decide whether an integer type is signed or not.
6811 Optionally treat bitfields as signed by default. */
6815 It is implementation-defined whether a plain (neither
6816 explicitly signed or unsigned) char, short, int, or long
6817 bit-field is signed or unsigned.
6819 Naturally, we extend this to long long as well. Note that
6820 this does not include wchar_t. */
6821 || (bitfield && !flag_signed_bitfields
6823 /* A typedef for plain `int' without `signed' can be
6824 controlled just like plain `int', but a typedef for
6825 `signed int' cannot be so controlled. */
6827 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
6828 && (TREE_CODE (type) == INTEGER_TYPE
6829 || TREE_CODE (type) == CHAR_TYPE)
6830 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
6833 type = long_long_unsigned_type_node;
6835 type = long_unsigned_type_node;
6837 type = short_unsigned_type_node;
6838 else if (type == char_type_node)
6839 type = unsigned_char_type_node;
6840 else if (typedef_decl)
6841 type = c_common_unsigned_type (type);
6843 type = unsigned_type_node;
6845 else if (signed_p && type == char_type_node)
6846 type = signed_char_type_node;
6848 type = long_long_integer_type_node;
6850 type = long_integer_type_node;
6852 type = short_integer_type_node;
6854 if (declspecs->specs[(int)ds_complex])
6856 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
6857 error ("complex invalid for %qs", name);
6858 /* If we just have "complex", it is equivalent to
6859 "complex double", but if any modifiers at all are specified it is
6860 the complex form of TYPE. E.g, "complex short" is
6861 "complex short int". */
6863 else if (defaulted_int && ! longlong
6864 && ! (long_p || short_p || signed_p || unsigned_p))
6865 type = complex_double_type_node;
6866 else if (type == integer_type_node)
6867 type = complex_integer_type_node;
6868 else if (type == float_type_node)
6869 type = complex_float_type_node;
6870 else if (type == double_type_node)
6871 type = complex_double_type_node;
6872 else if (type == long_double_type_node)
6873 type = complex_long_double_type_node;
6875 type = build_complex_type (type);
6878 type_quals = TYPE_UNQUALIFIED;
6879 if (declspecs->specs[(int)ds_const])
6880 type_quals |= TYPE_QUAL_CONST;
6881 if (declspecs->specs[(int)ds_volatile])
6882 type_quals |= TYPE_QUAL_VOLATILE;
6883 if (declspecs->specs[(int)ds_restrict])
6884 type_quals |= TYPE_QUAL_RESTRICT;
6885 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
6886 error ("qualifiers are not allowed on declaration of %<operator %T%>",
6889 if (TREE_CODE (type) == FUNCTION_TYPE
6890 && type_quals != TYPE_UNQUALIFIED)
6892 /* This was an error in C++98 (cv-qualifiers cannot be added to
6893 a function type), but DR 295 makes the code well-formed by
6894 dropping the extra qualifiers. */
6897 tree bad_type = build_qualified_type (type, type_quals);
6898 pedwarn ("ignoring %qV qualifiers added to function type %qT",
6901 type_quals = TYPE_UNQUALIFIED;
6903 type_quals |= cp_type_quals (type);
6904 type = cp_build_qualified_type_real
6905 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
6906 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
6907 /* We might have ignored or rejected some of the qualifiers. */
6908 type_quals = cp_type_quals (type);
6911 inlinep = !! declspecs->specs[(int)ds_inline];
6912 virtualp = !! declspecs->specs[(int)ds_virtual];
6913 explicitp = !! declspecs->specs[(int)ds_explicit];
6915 storage_class = declspecs->storage_class;
6916 if (storage_class == sc_static)
6917 staticp = 1 + (decl_context == FIELD);
6919 if (virtualp && staticp == 2)
6921 error ("member %qD cannot be declared both virtual and static", dname);
6924 friendp = !! declspecs->specs[(int)ds_friend];
6926 if (dependant_name && !friendp)
6928 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
6929 return void_type_node;
6932 /* Issue errors about use of storage classes for parameters. */
6933 if (decl_context == PARM)
6935 if (declspecs->specs[(int)ds_typedef])
6936 error ("typedef declaration invalid in parameter declaration");
6937 else if (storage_class == sc_static
6938 || storage_class == sc_extern
6940 error ("storage class specifiers invalid in parameter declarations");
6943 /* Give error if `virtual' is used outside of class declaration. */
6945 && (current_class_name == NULL_TREE || decl_context != FIELD))
6947 error ("virtual outside class declaration");
6951 /* Static anonymous unions are dealt with here. */
6952 if (staticp && decl_context == TYPENAME
6954 && ANON_AGGR_TYPE_P (declspecs->type))
6955 decl_context = FIELD;
6957 /* Warn about storage classes that are invalid for certain
6958 kinds of declarations (parameters, typenames, etc.). */
6959 if (declspecs->multiple_storage_classes_p)
6960 error ("multiple storage classes in declaration of %qs", name);
6963 && storage_class != sc_extern
6964 && storage_class != sc_static)
6965 || declspecs->specs[(int)ds_typedef]))
6967 error ("multiple storage classes in declaration of %qs", name);
6970 else if (decl_context != NORMAL
6971 && ((storage_class != sc_none
6972 && storage_class != sc_mutable)
6975 if ((decl_context == PARM || decl_context == CATCHPARM)
6976 && (storage_class == sc_register
6977 || storage_class == sc_auto))
6979 else if (declspecs->specs[(int)ds_typedef])
6981 else if (decl_context == FIELD
6982 /* C++ allows static class elements. */
6983 && storage_class == sc_static)
6984 /* C++ also allows inlines and signed and unsigned elements,
6985 but in those cases we don't come in here. */
6989 if (decl_context == FIELD)
6990 error ("storage class specified for %qs", name);
6993 if (decl_context == PARM || decl_context == CATCHPARM)
6994 error ("storage class specified for parameter %qs", name);
6996 error ("storage class specified for typename");
6998 if (storage_class == sc_register
6999 || storage_class == sc_auto
7000 || storage_class == sc_extern
7002 storage_class = sc_none;
7005 else if (storage_class == sc_extern && initialized
7008 if (toplevel_bindings_p ())
7010 /* It's common practice (and completely valid) to have a const
7011 be initialized and declared extern. */
7012 if (!(type_quals & TYPE_QUAL_CONST))
7013 warning (0, "%qs initialized and declared %<extern%>", name);
7016 error ("%qs has both %<extern%> and initializer", name);
7018 else if (storage_class == sc_extern && funcdef_flag
7019 && ! toplevel_bindings_p ())
7020 error ("nested function %qs declared %<extern%>", name);
7021 else if (toplevel_bindings_p ())
7023 if (storage_class == sc_auto)
7024 error ("top-level declaration of %qs specifies %<auto%>", name);
7027 && storage_class != sc_extern
7028 && storage_class != sc_static)
7030 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7035 if (storage_class && friendp)
7036 error ("storage class specifiers invalid in friend function declarations");
7039 unqualified_id = NULL_TREE;
7042 unqualified_id = id_declarator->u.id.unqualified_name;
7043 if (TREE_CODE (unqualified_id) == BASELINK)
7044 unqualified_id = BASELINK_FUNCTIONS (unqualified_id);
7045 switch (TREE_CODE (unqualified_id))
7049 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7054 = constructor_name (TREE_TYPE (unqualified_id));
7057 case IDENTIFIER_NODE:
7058 case TEMPLATE_ID_EXPR:
7066 /* Determine the type of the entity declared by recurring on the
7068 for (; declarator; declarator = declarator->declarator)
7070 const cp_declarator *inner_declarator;
7073 if (type == error_mark_node)
7074 return error_mark_node;
7076 attrs = declarator->attributes;
7082 if (declarator == NULL || declarator->kind == cdk_id)
7083 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7084 if (declarator->kind == cdk_function)
7085 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7086 if (declarator->kind == cdk_array)
7087 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7088 returned_attrs = decl_attributes (&type,
7089 chainon (returned_attrs, attrs),
7093 if (declarator->kind == cdk_id)
7096 inner_declarator = declarator->declarator;
7098 switch (declarator->kind)
7101 type = create_array_type_for_decl (dname, type,
7102 declarator->u.array.bounds);
7110 /* Declaring a function type.
7111 Make sure we have a valid type for the function to return. */
7113 /* We now know that the TYPE_QUALS don't apply to the
7114 decl, but to its return type. */
7115 type_quals = TYPE_UNQUALIFIED;
7117 /* Warn about some types functions can't return. */
7119 if (TREE_CODE (type) == FUNCTION_TYPE)
7121 error ("%qs declared as function returning a function", name);
7122 type = integer_type_node;
7124 if (TREE_CODE (type) == ARRAY_TYPE)
7126 error ("%qs declared as function returning an array", name);
7127 type = integer_type_node;
7130 /* Pick up type qualifiers which should be applied to `this'. */
7131 quals = declarator->u.function.qualifiers;
7133 /* Pick up the exception specifications. */
7134 raises = declarator->u.function.exception_specification;
7136 /* Say it's a definition only for the CALL_EXPR
7137 closest to the identifier. */
7138 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7140 if (ctype == NULL_TREE
7141 && decl_context == FIELD
7143 && (friendp == 0 || dname == current_class_name))
7144 ctype = current_class_type;
7146 if (ctype && sfk == sfk_conversion)
7147 TYPE_HAS_CONVERSION (ctype) = 1;
7148 if (ctype && (sfk == sfk_constructor
7149 || sfk == sfk_destructor))
7151 /* We are within a class's scope. If our declarator name
7152 is the same as the class name, and we are defining
7153 a function, then it is a constructor/destructor, and
7154 therefore returns a void type. */
7156 if (flags == DTOR_FLAG)
7158 /* ISO C++ 12.4/2. A destructor may not be
7159 declared const or volatile. A destructor may
7162 error ("destructor cannot be static member function");
7165 error ("destructors may not be cv-qualified");
7166 quals = TYPE_UNQUALIFIED;
7168 if (decl_context == FIELD)
7170 if (! member_function_or_else (ctype,
7173 return void_type_node;
7176 else /* It's a constructor. */
7180 /* ISO C++ 12.1. A constructor may not be
7181 declared const or volatile. A constructor may
7182 not be virtual. A constructor may not be
7185 error ("constructor cannot be static member function");
7188 pedwarn ("constructors cannot be declared virtual");
7193 error ("constructors may not be cv-qualified");
7194 quals = TYPE_UNQUALIFIED;
7196 if (decl_context == FIELD)
7198 if (! member_function_or_else (ctype,
7201 return void_type_node;
7202 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7203 if (sfk != sfk_constructor)
7207 if (decl_context == FIELD)
7213 error ("can't initialize friend function %qs", name);
7216 /* Cannot be both friend and virtual. */
7217 error ("virtual functions cannot be friends");
7220 if (decl_context == NORMAL)
7221 error ("friend declaration not in class definition");
7222 if (current_function_decl && funcdef_flag)
7223 error ("can't define friend function %qs in a local "
7228 arg_types = grokparms (declarator->u.function.parameters,
7231 if (inner_declarator
7232 && inner_declarator->kind == cdk_id
7233 && inner_declarator->u.id.sfk == sfk_destructor
7234 && arg_types != void_list_node)
7236 error ("destructors may not have parameters");
7237 arg_types = void_list_node;
7241 type = build_function_type (type, arg_types);
7242 type = cp_build_qualified_type (type, quals);
7249 /* Filter out pointers-to-references and references-to-references.
7250 We can get these if a TYPE_DECL is used. */
7252 if (TREE_CODE (type) == REFERENCE_TYPE)
7254 error (declarator->kind == cdk_reference
7255 ? "cannot declare reference to %q#T"
7256 : "cannot declare pointer to %q#T", type);
7257 type = TREE_TYPE (type);
7259 else if (VOID_TYPE_P (type))
7261 if (declarator->kind == cdk_reference)
7262 error ("cannot declare reference to %q#T", type);
7263 else if (declarator->kind == cdk_ptrmem)
7264 error ("cannot declare pointer to %q#T member", type);
7267 /* We now know that the TYPE_QUALS don't apply to the decl,
7268 but to the target of the pointer. */
7269 type_quals = TYPE_UNQUALIFIED;
7271 if (declarator->kind == cdk_ptrmem
7272 && (TREE_CODE (type) == FUNCTION_TYPE
7273 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7277 /* If the type is a FUNCTION_TYPE, pick up the
7278 qualifiers from that function type. No other
7279 qualifiers may be supplied. */
7280 if (TREE_CODE (type) == FUNCTION_TYPE)
7281 quals = cp_type_quals (type);
7283 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7284 grok_method_quals (declarator->u.pointer.class_type,
7286 type = TREE_TYPE (dummy);
7287 quals = TYPE_UNQUALIFIED;
7290 if (declarator->kind == cdk_reference)
7292 if (!VOID_TYPE_P (type))
7293 type = build_reference_type (type);
7295 else if (TREE_CODE (type) == METHOD_TYPE)
7296 type = build_ptrmemfunc_type (build_pointer_type (type));
7297 else if (declarator->kind == cdk_ptrmem)
7299 /* We might have parsed a namespace as the class type. */
7300 if (TREE_CODE (declarator->u.pointer.class_type)
7303 error ("%qD is a namespace",
7304 declarator->u.pointer.class_type);
7305 type = build_pointer_type (type);
7307 else if (declarator->u.pointer.class_type == error_mark_node)
7308 /* We will already have complained. */
7309 type = error_mark_node;
7311 type = build_ptrmem_type (declarator->u.pointer.class_type,
7315 type = build_pointer_type (type);
7317 /* Process a list of type modifier keywords (such as
7318 const or volatile) that were given inside the `*' or `&'. */
7320 if (declarator->u.pointer.qualifiers)
7323 = cp_build_qualified_type (type,
7324 declarator->u.pointer.qualifiers);
7325 type_quals = cp_type_quals (type);
7338 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7339 && TREE_CODE (type) != FUNCTION_TYPE
7340 && TREE_CODE (type) != METHOD_TYPE)
7342 error ("template-id %qD used as a declarator",
7344 unqualified_id = dname;
7347 /* If DECLARATOR is non-NULL, we know it is a cdk_id declarator;
7348 otherwise, we would not have exited the loop above. */
7350 && declarator->u.id.qualifying_scope
7351 && TYPE_P (declarator->u.id.qualifying_scope))
7355 ctype = declarator->u.id.qualifying_scope;
7356 ctype = TYPE_MAIN_VARIANT (ctype);
7358 while (t != NULL_TREE && CLASS_TYPE_P (t))
7360 /* You're supposed to have one `template <...>' for every
7361 template class, but you don't need one for a full
7362 specialization. For example:
7364 template <class T> struct S{};
7365 template <> struct S<int> { void f(); };
7366 void S<int>::f () {}
7368 is correct; there shouldn't be a `template <>' for the
7369 definition of `S<int>::f'. */
7370 if (CLASSTYPE_TEMPLATE_INFO (t)
7371 && (CLASSTYPE_TEMPLATE_INSTANTIATION (t)
7372 || uses_template_parms (CLASSTYPE_TI_ARGS (t)))
7373 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7374 template_count += 1;
7376 t = TYPE_MAIN_DECL (t);
7377 t = DECL_CONTEXT (t);
7380 if (ctype == current_class_type)
7386 Is this ill-formed? */
7389 pedwarn ("extra qualification %<%T::%> on member %qs ignored",
7392 else if (TREE_CODE (type) == FUNCTION_TYPE)
7394 tree sname = declarator->u.id.unqualified_name;
7396 if (TREE_CODE (sname) == IDENTIFIER_NODE
7397 && NEW_DELETE_OPNAME_P (sname))
7398 /* Overloaded operator new and operator delete
7399 are always static functions. */
7401 else if (current_class_type == NULL_TREE || friendp)
7403 = build_method_type_directly (ctype,
7405 TYPE_ARG_TYPES (type));
7408 error ("cannot declare member function %<%T::%s%> within %<%T%>",
7409 ctype, name, current_class_type);
7410 return error_mark_node;
7413 else if (declspecs->specs[(int)ds_typedef]
7414 || COMPLETE_TYPE_P (complete_type (ctype)))
7416 /* Have to move this code elsewhere in this function.
7417 this code is used for i.e., typedef int A::M; M *pm;
7419 It is? How? jason 10/2/94 */
7421 if (current_class_type)
7423 error ("cannot declare member %<%T::%s%> within %qT",
7424 ctype, name, current_class_type);
7425 return void_type_node;
7430 cxx_incomplete_type_error (NULL_TREE, ctype);
7431 return error_mark_node;
7438 *attrlist = chainon (returned_attrs, *attrlist);
7440 attrlist = &returned_attrs;
7443 /* Now TYPE has the actual type. */
7445 /* Did array size calculations overflow? */
7447 if (TREE_CODE (type) == ARRAY_TYPE
7448 && COMPLETE_TYPE_P (type)
7449 && TREE_OVERFLOW (TYPE_SIZE (type)))
7451 error ("size of array %qs is too large", name);
7452 /* If we proceed with the array type as it is, we'll eventually
7453 crash in tree_low_cst(). */
7454 type = error_mark_node;
7457 if ((decl_context == FIELD || decl_context == PARM)
7458 && !processing_template_decl
7459 && variably_modified_type_p (type, NULL_TREE))
7461 if (decl_context == FIELD)
7462 error ("data member may not have variably modified type %qT", type);
7464 error ("parameter may not have variably modified type %qT", type);
7465 type = error_mark_node;
7468 if (explicitp == 1 || (explicitp && friendp))
7470 /* [dcl.fct.spec] The explicit specifier shall only be used in
7471 declarations of constructors within a class definition. */
7472 error ("only declarations of constructors can be %<explicit%>");
7476 if (storage_class == sc_mutable)
7478 if (decl_context != FIELD || friendp)
7480 error ("non-member %qs cannot be declared %<mutable%>", name);
7481 storage_class = sc_none;
7483 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7485 error ("non-object member %qs cannot be declared %<mutable%>", name);
7486 storage_class = sc_none;
7488 else if (TREE_CODE (type) == FUNCTION_TYPE
7489 || TREE_CODE (type) == METHOD_TYPE)
7491 error ("function %qs cannot be declared %<mutable%>", name);
7492 storage_class = sc_none;
7496 error ("static %qs cannot be declared %<mutable%>", name);
7497 storage_class = sc_none;
7499 else if (type_quals & TYPE_QUAL_CONST)
7501 error ("const %qs cannot be declared %<mutable%>", name);
7502 storage_class = sc_none;
7506 /* If this is declaring a typedef name, return a TYPE_DECL. */
7507 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7511 /* Note that the grammar rejects storage classes
7512 in typenames, fields or parameters. */
7513 if (current_lang_name == lang_name_java)
7514 TYPE_FOR_JAVA (type) = 1;
7516 if (decl_context == FIELD)
7517 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7519 decl = build_decl (TYPE_DECL, unqualified_id, type);
7520 if (id_declarator && declarator->u.id.qualifying_scope)
7521 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7523 if (decl_context != FIELD)
7525 if (!current_function_decl)
7526 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7527 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7528 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7529 (current_function_decl)))
7530 /* The TYPE_DECL is "abstract" because there will be
7531 clones of this constructor/destructor, and there will
7532 be copies of this TYPE_DECL generated in those
7534 DECL_ABSTRACT (decl) = 1;
7536 else if (constructor_name_p (unqualified_id, current_class_type))
7537 pedwarn ("ISO C++ forbids nested type %qD with same name "
7538 "as enclosing class",
7541 /* If the user declares "typedef struct {...} foo" then the
7542 struct will have an anonymous name. Fill that name in now.
7543 Nothing can refer to it, so nothing needs know about the name
7545 if (type != error_mark_node
7548 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7549 && TYPE_ANONYMOUS_P (type)
7550 /* Don't do this if there are attributes. */
7551 && (!attrlist || !*attrlist)
7552 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7554 tree oldname = TYPE_NAME (type);
7557 /* Replace the anonymous name with the real name everywhere. */
7558 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7559 if (TYPE_NAME (t) == oldname)
7560 TYPE_NAME (t) = decl;
7562 if (TYPE_LANG_SPECIFIC (type))
7563 TYPE_WAS_ANONYMOUS (type) = 1;
7565 /* If this is a typedef within a template class, the nested
7566 type is a (non-primary) template. The name for the
7567 template needs updating as well. */
7568 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7569 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7570 = TYPE_IDENTIFIER (type);
7572 /* FIXME remangle member functions; member functions of a
7573 type with external linkage have external linkage. */
7578 if (ctype == NULL_TREE)
7580 if (TREE_CODE (type) == METHOD_TYPE)
7581 ctype = TYPE_METHOD_BASETYPE (type);
7582 /* Any qualifiers on a function type typedef have
7583 already been dealt with. */
7584 else if (TREE_CODE (type) == FUNCTION_TYPE)
7585 quals = TYPE_UNQUALIFIED;
7587 if (ctype != NULL_TREE)
7588 grok_method_quals (ctype, decl, quals);
7592 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7593 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7595 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7596 inlinep, friendp, raises != NULL_TREE);
7601 /* Detect the case of an array type of unspecified size
7602 which came, as such, direct from a typedef name.
7603 We must copy the type, so that the array's domain can be
7604 individually set by the object's initializer. */
7606 if (type && typedef_type
7607 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7608 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7609 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7611 /* Detect where we're using a typedef of function type to declare a
7612 function. PARMS will not be set, so we must create it now. */
7614 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7616 tree decls = NULL_TREE;
7619 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7621 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7623 TREE_CHAIN (decl) = decls;
7627 parms = nreverse (decls);
7629 if (decl_context != TYPENAME)
7631 /* A cv-qualifier-seq shall only be part of the function type
7632 for a non-static member function. [8.3.5/4 dcl.fct] */
7633 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7634 && (current_class_type == NULL_TREE || staticp) )
7636 error ("qualified function types cannot be used to declare %s functions",
7637 (staticp? "static member" : "free"));
7638 type = TYPE_MAIN_VARIANT (type);
7641 /* The qualifiers on the function type become the qualifiers on
7642 the non-static member function. */
7643 quals |= cp_type_quals (type);
7647 /* If this is a type name (such as, in a cast or sizeof),
7648 compute the type and return it now. */
7650 if (decl_context == TYPENAME)
7652 /* Note that the grammar rejects storage classes
7653 in typenames, fields or parameters. */
7654 if (type_quals != TYPE_UNQUALIFIED)
7655 type_quals = TYPE_UNQUALIFIED;
7657 /* Special case: "friend class foo" looks like a TYPENAME context. */
7660 if (type_quals != TYPE_UNQUALIFIED)
7662 error ("type qualifiers specified for friend class declaration");
7663 type_quals = TYPE_UNQUALIFIED;
7667 error ("%<inline%> specified for friend class declaration");
7673 /* Don't allow friend declaration without a class-key. */
7674 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7675 pedwarn ("template parameters cannot be friends");
7676 else if (TREE_CODE (type) == TYPENAME_TYPE)
7677 pedwarn ("friend declaration requires class-key, "
7678 "i.e. %<friend class %T::%D%>",
7679 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7681 pedwarn ("friend declaration requires class-key, "
7682 "i.e. %<friend %#T%>",
7686 /* Only try to do this stuff if we didn't already give up. */
7687 if (type != integer_type_node)
7689 /* A friendly class? */
7690 if (current_class_type)
7691 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7694 error ("trying to make class %qT a friend of global scope",
7697 type = void_type_node;
7702 if (ctype == NULL_TREE)
7704 if (TREE_CODE (type) != METHOD_TYPE)
7705 error ("invalid qualifiers on non-member function type");
7707 ctype = TYPE_METHOD_BASETYPE (type);
7711 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7712 grok_method_quals (ctype, dummy, quals);
7713 type = TREE_TYPE (dummy);
7719 else if (unqualified_id == NULL_TREE && decl_context != PARM
7720 && decl_context != CATCHPARM
7721 && TREE_CODE (type) != UNION_TYPE
7724 error ("abstract declarator %qT used as declaration", type);
7725 return error_mark_node;
7728 /* Only functions may be declared using an operator-function-id. */
7730 && IDENTIFIER_OPNAME_P (unqualified_id)
7731 && TREE_CODE (type) != FUNCTION_TYPE
7732 && TREE_CODE (type) != METHOD_TYPE)
7734 error ("declaration of %qD as non-function", unqualified_id);
7735 return error_mark_node;
7738 /* We don't check parameter types here because we can emit a better
7739 error message later. */
7740 if (decl_context != PARM)
7741 type = check_var_type (unqualified_id, type);
7743 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7744 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7746 if (decl_context == PARM || decl_context == CATCHPARM)
7748 if (ctype || in_namespace)
7749 error ("cannot use %<::%> in parameter declaration");
7751 /* A parameter declared as an array of T is really a pointer to T.
7752 One declared as a function is really a pointer to a function.
7753 One declared as a member is really a pointer to member. */
7755 if (TREE_CODE (type) == ARRAY_TYPE)
7757 /* Transfer const-ness of array into that of type pointed to. */
7758 type = build_pointer_type (TREE_TYPE (type));
7759 type_quals = TYPE_UNQUALIFIED;
7761 else if (TREE_CODE (type) == FUNCTION_TYPE)
7762 type = build_pointer_type (type);
7768 if (decl_context == PARM)
7770 decl = cp_build_parm_decl (unqualified_id, type);
7772 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7773 inlinep, friendp, raises != NULL_TREE);
7775 else if (decl_context == FIELD)
7777 /* The C99 flexible array extension. */
7778 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7779 && TYPE_DOMAIN (type) == NULL_TREE)
7781 tree itype = compute_array_index_type (dname, integer_zero_node);
7782 type = build_cplus_array_type (TREE_TYPE (type), itype);
7785 if (type == error_mark_node)
7787 /* Happens when declaring arrays of sizes which
7788 are error_mark_node, for example. */
7791 else if (in_namespace && !friendp)
7793 /* Something like struct S { int N::j; }; */
7794 error ("invalid use of %<::%>");
7797 else if (TREE_CODE (type) == FUNCTION_TYPE)
7800 tree function_context;
7804 if (ctype == NULL_TREE)
7805 ctype = current_class_type;
7807 if (ctype == NULL_TREE)
7809 error ("can't make %qD into a method -- not in a class",
7811 return void_type_node;
7814 /* ``A union may [ ... ] not [ have ] virtual functions.''
7816 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
7818 error ("function %qD declared virtual inside a union",
7820 return void_type_node;
7823 if (NEW_DELETE_OPNAME_P (unqualified_id))
7827 error ("%qD cannot be declared virtual, since it "
7833 else if (staticp < 2)
7834 type = build_method_type_directly (ctype,
7836 TYPE_ARG_TYPES (type));
7839 /* Check that the name used for a destructor makes sense. */
7840 if (sfk == sfk_destructor
7841 && !same_type_p (TREE_OPERAND
7842 (id_declarator->u.id.unqualified_name, 0),
7845 error ("declaration of %qD as member of %qT",
7846 id_declarator->u.id.unqualified_name,
7848 return error_mark_node;
7851 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
7852 function_context = (ctype != NULL_TREE) ?
7853 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
7854 publicp = (! friendp || ! staticp)
7855 && function_context == NULL_TREE;
7856 decl = grokfndecl (ctype, type,
7857 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
7858 ? unqualified_id : dname,
7861 virtualp, flags, quals, raises,
7862 friendp ? -1 : 0, friendp, publicp, inlinep,
7864 funcdef_flag, template_count, in_namespace, attrlist);
7865 if (decl == NULL_TREE)
7868 /* This clobbers the attrs stored in `decl' from `attrlist'. */
7869 /* The decl and setting of decl_attr is also turned off. */
7870 decl = build_decl_attribute_variant (decl, decl_attr);
7873 /* [class.conv.ctor]
7875 A constructor declared without the function-specifier
7876 explicit that can be called with a single parameter
7877 specifies a conversion from the type of its first
7878 parameter to the type of its class. Such a constructor
7879 is called a converting constructor. */
7881 DECL_NONCONVERTING_P (decl) = 1;
7882 else if (DECL_CONSTRUCTOR_P (decl))
7884 /* The constructor can be called with exactly one
7885 parameter if there is at least one parameter, and
7886 any subsequent parameters have default arguments.
7887 Ignore any compiler-added parms. */
7888 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
7890 if (arg_types == void_list_node
7892 && TREE_CHAIN (arg_types)
7893 && TREE_CHAIN (arg_types) != void_list_node
7894 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
7895 DECL_NONCONVERTING_P (decl) = 1;
7898 else if (TREE_CODE (type) == METHOD_TYPE)
7900 /* We only get here for friend declarations of
7901 members of other classes. */
7902 /* All method decls are public, so tell grokfndecl to set
7903 TREE_PUBLIC, also. */
7904 decl = grokfndecl (ctype, type,
7905 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
7906 ? unqualified_id : dname,
7909 virtualp, flags, quals, raises,
7910 friendp ? -1 : 0, friendp, 1, 0, sfk,
7911 funcdef_flag, template_count, in_namespace,
7913 if (decl == NULL_TREE)
7916 else if (!staticp && !dependent_type_p (type)
7917 && !COMPLETE_TYPE_P (complete_type (type))
7918 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
7921 error ("field %qD has incomplete type", unqualified_id);
7923 error ("name %qT has incomplete type", type);
7925 /* If we're instantiating a template, tell them which
7926 instantiation made the field's type be incomplete. */
7927 if (current_class_type
7928 && TYPE_NAME (current_class_type)
7929 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
7931 && declspecs->type == type)
7932 error (" in instantiation of template %qT",
7933 current_class_type);
7935 type = error_mark_node;
7942 error ("%qE is neither function nor member function; "
7943 "cannot be declared friend", unqualified_id);
7951 /* Friends are treated specially. */
7952 if (ctype == current_class_type)
7953 warning (0, "member functions are implicitly friends of their class");
7954 else if (decl && DECL_NAME (decl))
7956 if (template_class_depth (current_class_type) == 0)
7958 decl = check_explicit_specialization
7959 (unqualified_id, decl, template_count,
7960 2 * (funcdef_flag != 0) + 4);
7961 if (decl == error_mark_node)
7962 return error_mark_node;
7965 decl = do_friend (ctype, unqualified_id, decl,
7966 *attrlist, flags, quals, funcdef_flag);
7970 return void_type_node;
7973 /* Structure field. It may not be a function, except for C++. */
7975 if (decl == NULL_TREE)
7981 /* An attempt is being made to initialize a non-static
7982 member. But, from [class.mem]:
7984 4 A member-declarator can contain a
7985 constant-initializer only if it declares a static
7986 member (_class.static_) of integral or enumeration
7987 type, see _class.static.data_.
7989 This used to be relatively common practice, but
7990 the rest of the compiler does not correctly
7991 handle the initialization unless the member is
7992 static so we make it static below. */
7993 pedwarn ("ISO C++ forbids initialization of member %qD",
7995 pedwarn ("making %qD static", unqualified_id);
7999 if (uses_template_parms (type))
8000 /* We'll check at instantiation time. */
8002 else if (check_static_variable_definition (unqualified_id,
8004 /* If we just return the declaration, crashes
8005 will sometimes occur. We therefore return
8006 void_type_node, as if this was a friend
8007 declaration, to cause callers to completely
8008 ignore this declaration. */
8009 return void_type_node;
8014 /* C++ allows static class members. All other work
8015 for this is done by grokfield. */
8016 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8017 set_linkage_for_static_data_member (decl);
8018 /* Even if there is an in-class initialization, DECL
8019 is considered undefined until an out-of-class
8020 definition is provided. */
8021 DECL_EXTERNAL (decl) = 1;
8025 decl = build_decl (FIELD_DECL, unqualified_id, type);
8026 DECL_NONADDRESSABLE_P (decl) = bitfield;
8027 if (storage_class == sc_mutable)
8029 DECL_MUTABLE_P (decl) = 1;
8030 storage_class = sc_none;
8034 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8035 inlinep, friendp, raises != NULL_TREE);
8038 else if (TREE_CODE (type) == FUNCTION_TYPE
8039 || TREE_CODE (type) == METHOD_TYPE)
8044 if (!unqualified_id)
8047 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8048 original_name = dname;
8050 original_name = unqualified_id;
8052 if (storage_class == sc_auto)
8053 error ("storage class %<auto%> invalid for function %qs", name);
8054 else if (storage_class == sc_register)
8055 error ("storage class %<register%> invalid for function %qs", name);
8057 error ("storage class %<__thread%> invalid for function %qs", name);
8059 /* Function declaration not at top level.
8060 Storage classes other than `extern' are not allowed
8061 and `extern' makes no difference. */
8062 if (! toplevel_bindings_p ()
8063 && (storage_class == sc_static
8064 || declspecs->specs[(int)ds_inline])
8067 if (storage_class == sc_static)
8068 pedwarn ("%<static%> specified invalid for function %qs "
8069 "declared out of global scope", name);
8071 pedwarn ("%<inline%> specifier invalid for function %qs "
8072 "declared out of global scope", name);
8075 if (ctype == NULL_TREE)
8079 error ("virtual non-class function %qs", name);
8083 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8084 && !NEW_DELETE_OPNAME_P (original_name))
8085 type = build_method_type_directly (ctype,
8087 TYPE_ARG_TYPES (type));
8089 /* Record presence of `static'. */
8090 publicp = (ctype != NULL_TREE
8091 || storage_class == sc_extern
8092 || storage_class != sc_static);
8094 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8095 virtualp, flags, quals, raises,
8097 publicp, inlinep, sfk, funcdef_flag,
8098 template_count, in_namespace, attrlist);
8099 if (decl == NULL_TREE)
8104 int invalid_static = 0;
8106 /* Don't allow a static member function in a class, and forbid
8107 declaring main to be static. */
8108 if (TREE_CODE (type) == METHOD_TYPE)
8110 pedwarn ("cannot declare member function %qD to have "
8111 "static linkage", decl);
8114 else if (current_function_decl)
8116 /* FIXME need arm citation */
8117 error ("cannot declare static function inside another function");
8124 storage_class = sc_none;
8130 /* It's a variable. */
8132 /* An uninitialized decl with `extern' is a reference. */
8133 decl = grokvardecl (type, unqualified_id,
8136 (type_quals & TYPE_QUAL_CONST) != 0,
8137 ctype ? ctype : in_namespace);
8138 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8139 inlinep, friendp, raises != NULL_TREE);
8143 DECL_CONTEXT (decl) = ctype;
8146 pedwarn ("%<static%> may not be used when defining "
8147 "(as opposed to declaring) a static data member");
8149 storage_class = sc_none;
8151 if (storage_class == sc_register && TREE_STATIC (decl))
8153 error ("static member %qD declared %<register%>", decl);
8154 storage_class = sc_none;
8156 if (storage_class == sc_extern && pedantic)
8158 pedwarn ("cannot explicitly declare member %q#D to have "
8161 storage_class = sc_none;
8166 /* Record `register' declaration for warnings on &
8167 and in case doing stupid register allocation. */
8169 if (storage_class == sc_register)
8170 DECL_REGISTER (decl) = 1;
8171 else if (storage_class == sc_extern)
8172 DECL_THIS_EXTERN (decl) = 1;
8173 else if (storage_class == sc_static)
8174 DECL_THIS_STATIC (decl) = 1;
8176 /* Record constancy and volatility. There's no need to do this
8177 when processing a template; we'll do this for the instantiated
8178 declaration based on the type of DECL. */
8179 if (!processing_template_decl)
8180 cp_apply_type_quals_to_decl (type_quals, decl);
8186 /* Subroutine of start_function. Ensure that each of the parameter
8187 types (as listed in PARMS) is complete, as is required for a
8188 function definition. */
8191 require_complete_types_for_parms (tree parms)
8193 for (; parms; parms = TREE_CHAIN (parms))
8195 if (dependent_type_p (TREE_TYPE (parms)))
8197 if (VOID_TYPE_P (TREE_TYPE (parms)))
8198 /* grokparms will have already issued an error. */
8199 TREE_TYPE (parms) = error_mark_node;
8200 else if (complete_type_or_else (TREE_TYPE (parms), parms))
8202 layout_decl (parms, 0);
8203 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8208 /* Returns nonzero if T is a local variable. */
8211 local_variable_p (tree t)
8213 if ((TREE_CODE (t) == VAR_DECL
8214 /* A VAR_DECL with a context that is a _TYPE is a static data
8216 && !TYPE_P (CP_DECL_CONTEXT (t))
8217 /* Any other non-local variable must be at namespace scope. */
8218 && !DECL_NAMESPACE_SCOPE_P (t))
8219 || (TREE_CODE (t) == PARM_DECL))
8225 /* Returns nonzero if T is an automatic local variable or a label.
8226 (These are the declarations that need to be remapped when the code
8227 containing them is duplicated.) */
8230 nonstatic_local_decl_p (tree t)
8232 return ((local_variable_p (t) && !TREE_STATIC (t))
8233 || TREE_CODE (t) == LABEL_DECL
8234 || TREE_CODE (t) == RESULT_DECL);
8237 /* Like local_variable_p, but suitable for use as a tree-walking
8241 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8242 void *data ATTRIBUTE_UNUSED)
8244 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8246 else if (TYPE_P (*tp))
8253 /* Check that ARG, which is a default-argument expression for a
8254 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8255 something goes wrong. DECL may also be a _TYPE node, rather than a
8256 DECL, if there is no DECL available. */
8259 check_default_argument (tree decl, tree arg)
8264 if (TREE_CODE (arg) == DEFAULT_ARG)
8265 /* We get a DEFAULT_ARG when looking at an in-class declaration
8266 with a default argument. Ignore the argument for now; we'll
8267 deal with it after the class is complete. */
8270 if (processing_template_decl || uses_template_parms (arg))
8271 /* We don't do anything checking until instantiation-time. Note
8272 that there may be uninstantiated arguments even for an
8273 instantiated function, since default arguments are not
8274 instantiated until they are needed. */
8283 decl_type = TREE_TYPE (decl);
8285 if (arg == error_mark_node
8286 || decl == error_mark_node
8287 || TREE_TYPE (arg) == error_mark_node
8288 || decl_type == error_mark_node)
8289 /* Something already went wrong. There's no need to check
8291 return error_mark_node;
8293 /* [dcl.fct.default]
8295 A default argument expression is implicitly converted to the
8297 if (!TREE_TYPE (arg)
8298 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg))
8301 error ("default argument for %q#D has type %qT",
8302 decl, TREE_TYPE (arg));
8304 error ("default argument for parameter of type %qT has type %qT",
8305 decl_type, TREE_TYPE (arg));
8307 return error_mark_node;
8310 /* [dcl.fct.default]
8312 Local variables shall not be used in default argument
8315 The keyword `this' shall not be used in a default argument of a
8317 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8321 error ("default argument %qE uses local variable %qD", arg, var);
8322 return error_mark_node;
8329 /* Decode the list of parameter types for a function type.
8330 Given the list of things declared inside the parens,
8331 return a list of types.
8333 If this parameter does not end with an ellipsis, we append
8336 *PARMS is set to the chain of PARM_DECLs created. */
8339 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8341 tree result = NULL_TREE;
8342 tree decls = NULL_TREE;
8343 int ellipsis = !first_parm || first_parm->ellipsis_p;
8344 cp_parameter_declarator *parm;
8347 for (parm = first_parm; parm != NULL; parm = parm->next)
8349 tree type = NULL_TREE;
8350 tree init = parm->default_argument;
8354 if (parm == no_parameters)
8357 attrs = parm->decl_specifiers.attributes;
8358 parm->decl_specifiers.attributes = NULL_TREE;
8359 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8360 PARM, init != NULL_TREE, &attrs);
8361 if (! decl || TREE_TYPE (decl) == error_mark_node)
8365 cplus_decl_attributes (&decl, attrs, 0);
8367 type = TREE_TYPE (decl);
8368 if (VOID_TYPE_P (type))
8370 if (same_type_p (type, void_type_node)
8371 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8372 /* this is a parmlist of `(void)', which is ok. */
8374 cxx_incomplete_type_error (decl, type);
8375 /* It's not a good idea to actually create parameters of
8376 type `void'; other parts of the compiler assume that a
8377 void type terminates the parameter list. */
8378 type = error_mark_node;
8379 TREE_TYPE (decl) = error_mark_node;
8382 if (type != error_mark_node)
8384 /* Top-level qualifiers on the parameters are
8385 ignored for function types. */
8386 type = cp_build_qualified_type (type, 0);
8387 if (TREE_CODE (type) == METHOD_TYPE)
8389 error ("parameter %qD invalidly declared method type", decl);
8390 type = build_pointer_type (type);
8391 TREE_TYPE (decl) = type;
8393 else if (abstract_virtuals_error (decl, type))
8394 any_error = 1; /* Seems like a good idea. */
8395 else if (POINTER_TYPE_P (type))
8397 /* [dcl.fct]/6, parameter types cannot contain pointers
8398 (references) to arrays of unknown bound. */
8399 tree t = TREE_TYPE (type);
8400 int ptr = TYPE_PTR_P (type);
8406 else if (TREE_CODE (t) != ARRAY_TYPE)
8408 else if (!TYPE_DOMAIN (t))
8412 if (TREE_CODE (t) == ARRAY_TYPE)
8413 error ("parameter %qD includes %s to array of unknown "
8415 decl, ptr ? "pointer" : "reference", t);
8418 if (!any_error && init)
8419 init = check_default_argument (decl, init);
8424 TREE_CHAIN (decl) = decls;
8426 result = tree_cons (init, type, result);
8428 decls = nreverse (decls);
8429 result = nreverse (result);
8431 result = chainon (result, void_list_node);
8438 /* D is a constructor or overloaded `operator='.
8440 Let T be the class in which D is declared. Then, this function
8443 -1 if D's is an ill-formed constructor or copy assignment operator
8444 whose first parameter is of type `T'.
8445 0 if D is not a copy constructor or copy assignment
8447 1 if D is a copy constructor or copy assignment operator whose
8448 first parameter is a reference to const qualified T.
8449 2 if D is a copy constructor or copy assignment operator whose
8450 first parameter is a reference to non-const qualified T.
8452 This function can be used as a predicate. Positive values indicate
8453 a copy constructor and nonzero values indicate a copy assignment
8463 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8465 if (DECL_TEMPLATE_INFO (d)
8466 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8467 /* Instantiations of template member functions are never copy
8468 functions. Note that member functions of templated classes are
8469 represented as template functions internally, and we must
8470 accept those as copy functions. */
8473 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8477 arg_type = TREE_VALUE (args);
8479 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8481 /* Pass by value copy assignment operator. */
8484 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8485 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8487 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8493 args = TREE_CHAIN (args);
8495 if (args && args != void_list_node && !TREE_PURPOSE (args))
8496 /* There are more non-optional args. */
8502 /* Remember any special properties of member function DECL. */
8504 void grok_special_member_properties (tree decl)
8506 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8507 ; /* Not special. */
8508 else if (DECL_CONSTRUCTOR_P (decl))
8510 int ctor = copy_fn_p (decl);
8516 A non-template constructor for class X is a copy
8517 constructor if its first parameter is of type X&, const
8518 X&, volatile X& or const volatile X&, and either there
8519 are no other parameters or else all other parameters have
8520 default arguments. */
8521 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8523 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8525 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8526 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8528 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8532 A non-template assignment operator for class X is a copy
8533 assignment operator if its parameter is of type X, X&, const
8534 X&, volatile X& or const volatile X&. */
8536 int assop = copy_fn_p (decl);
8540 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8542 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8547 /* Check a constructor DECL has the correct form. Complains
8548 if the class has a constructor of the form X(X). */
8551 grok_ctor_properties (tree ctype, tree decl)
8553 int ctor_parm = copy_fn_p (decl);
8559 A declaration of a constructor for a class X is ill-formed if
8560 its first parameter is of type (optionally cv-qualified) X
8561 and either there are no other parameters or else all other
8562 parameters have default arguments.
8564 We *don't* complain about member template instantiations that
8565 have this form, though; they can occur as we try to decide
8566 what constructor to use during overload resolution. Since
8567 overload resolution will never prefer such a constructor to
8568 the non-template copy constructor (which is either explicitly
8569 or implicitly defined), there's no need to worry about their
8570 existence. Theoretically, they should never even be
8571 instantiated, but that's hard to forestall. */
8572 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8580 /* An operator with this code is unary, but can also be binary. */
8583 ambi_op_p (enum tree_code code)
8585 return (code == INDIRECT_REF
8586 || code == ADDR_EXPR
8587 || code == CONVERT_EXPR
8588 || code == NEGATE_EXPR
8589 || code == PREINCREMENT_EXPR
8590 || code == PREDECREMENT_EXPR);
8593 /* An operator with this name can only be unary. */
8596 unary_op_p (enum tree_code code)
8598 return (code == TRUTH_NOT_EXPR
8599 || code == BIT_NOT_EXPR
8600 || code == COMPONENT_REF
8601 || code == TYPE_EXPR);
8604 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8605 errors are issued for invalid declarations. */
8608 grok_op_properties (tree decl, int friendp, bool complain)
8610 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8612 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8613 tree name = DECL_NAME (decl);
8614 enum tree_code operator_code;
8617 /* Count the number of arguments. */
8618 for (argtype = argtypes, arity = 0;
8619 argtype && argtype != void_list_node;
8620 argtype = TREE_CHAIN (argtype))
8623 if (current_class_type == NULL_TREE)
8626 if (DECL_CONV_FN_P (decl))
8627 operator_code = TYPE_EXPR;
8631 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8632 if (ansi_opname (CODE) == name) \
8634 operator_code = (CODE); \
8637 else if (ansi_assopname (CODE) == name) \
8639 operator_code = (CODE); \
8640 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8644 #include "operators.def"
8650 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8651 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8655 switch (operator_code)
8658 TYPE_HAS_NEW_OPERATOR (current_class_type) = 1;
8662 TYPE_GETS_DELETE (current_class_type) |= 1;
8666 TYPE_HAS_ARRAY_NEW_OPERATOR (current_class_type) = 1;
8669 case VEC_DELETE_EXPR:
8670 TYPE_GETS_DELETE (current_class_type) |= 2;
8678 /* [basic.std.dynamic.allocation]/1:
8680 A program is ill-formed if an allocation function is declared
8681 in a namespace scope other than global scope or declared static
8684 The same also holds true for deallocation functions. */
8685 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8686 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8688 if (DECL_NAMESPACE_SCOPE_P (decl))
8690 if (CP_DECL_CONTEXT (decl) != global_namespace)
8691 error ("%qD may not be declared within a namespace", decl);
8692 else if (!TREE_PUBLIC (decl))
8693 error ("%qD may not be declared as static", decl);
8697 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8698 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8699 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8700 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8703 /* An operator function must either be a non-static member function
8704 or have at least one parameter of a class, a reference to a class,
8705 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8706 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8708 if (operator_code == TYPE_EXPR
8709 || operator_code == CALL_EXPR
8710 || operator_code == COMPONENT_REF
8711 || operator_code == ARRAY_REF
8712 || operator_code == NOP_EXPR)
8714 error ("%qD must be a nonstatic member function", decl);
8721 if (DECL_STATIC_FUNCTION_P (decl))
8723 error ("%qD must be either a non-static member "
8724 "function or a non-member function", decl);
8728 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8730 tree arg = non_reference (TREE_VALUE (p));
8731 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8732 because these checks are performed even on
8733 template functions. */
8734 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8738 if (!p || p == void_list_node)
8743 error ("%qD must have an argument of class or "
8750 /* There are no restrictions on the arguments to an overloaded
8752 if (operator_code == CALL_EXPR)
8755 if (IDENTIFIER_TYPENAME_P (name) && ! DECL_TEMPLATE_INFO (decl))
8757 tree t = TREE_TYPE (name);
8760 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8761 const char *what = 0;
8764 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8766 if (TREE_CODE (t) == VOID_TYPE)
8768 else if (t == current_class_type)
8769 what = "the same type";
8770 /* Don't force t to be complete here. */
8771 else if (IS_AGGR_TYPE (t)
8772 && COMPLETE_TYPE_P (t)
8773 && DERIVED_FROM_P (t, current_class_type))
8774 what = "a base class";
8776 if (what && warn_conversion)
8777 warning (0, "conversion to %s%s will never use a type "
8778 "conversion operator",
8779 ref ? "a reference to " : "", what);
8782 if (operator_code == COND_EXPR)
8785 error ("ISO C++ prohibits overloading operator ?:");
8787 else if (ambi_op_p (operator_code))
8790 /* We pick the one-argument operator codes by default, so
8791 we don't have to change anything. */
8793 else if (arity == 2)
8795 /* If we thought this was a unary operator, we now know
8796 it to be a binary operator. */
8797 switch (operator_code)
8800 operator_code = MULT_EXPR;
8804 operator_code = BIT_AND_EXPR;
8808 operator_code = PLUS_EXPR;
8812 operator_code = MINUS_EXPR;
8815 case PREINCREMENT_EXPR:
8816 operator_code = POSTINCREMENT_EXPR;
8819 case PREDECREMENT_EXPR:
8820 operator_code = POSTDECREMENT_EXPR;
8827 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8829 if ((operator_code == POSTINCREMENT_EXPR
8830 || operator_code == POSTDECREMENT_EXPR)
8831 && ! processing_template_decl
8832 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
8835 error ("postfix %qD must take %<int%> as its argument",
8839 ("postfix %qD must take %<int%> as its second argument",
8846 error ("%qD must take either zero or one argument", decl);
8848 error ("%qD must take either one or two arguments", decl);
8851 /* More Effective C++ rule 6. */
8853 && (operator_code == POSTINCREMENT_EXPR
8854 || operator_code == POSTDECREMENT_EXPR
8855 || operator_code == PREINCREMENT_EXPR
8856 || operator_code == PREDECREMENT_EXPR))
8858 tree arg = TREE_VALUE (argtypes);
8859 tree ret = TREE_TYPE (TREE_TYPE (decl));
8860 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
8861 arg = TREE_TYPE (arg);
8862 arg = TYPE_MAIN_VARIANT (arg);
8863 if (operator_code == PREINCREMENT_EXPR
8864 || operator_code == PREDECREMENT_EXPR)
8866 if (TREE_CODE (ret) != REFERENCE_TYPE
8867 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
8869 warning (0, "prefix %qD should return %qT", decl,
8870 build_reference_type (arg));
8874 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
8875 warning (0, "postfix %qD should return %qT", decl, arg);
8879 else if (unary_op_p (operator_code))
8884 error ("%qD must take %<void%>", decl);
8886 error ("%qD must take exactly one argument", decl);
8889 else /* if (binary_op_p (operator_code)) */
8894 error ("%qD must take exactly one argument", decl);
8896 error ("%qD must take exactly two arguments", decl);
8899 /* More Effective C++ rule 7. */
8901 && (operator_code == TRUTH_ANDIF_EXPR
8902 || operator_code == TRUTH_ORIF_EXPR
8903 || operator_code == COMPOUND_EXPR))
8904 warning (0, "user-defined %qD always evaluates both arguments",
8908 /* Effective C++ rule 23. */
8911 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
8912 && (operator_code == PLUS_EXPR
8913 || operator_code == MINUS_EXPR
8914 || operator_code == TRUNC_DIV_EXPR
8915 || operator_code == MULT_EXPR
8916 || operator_code == TRUNC_MOD_EXPR)
8917 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
8918 warning (0, "%qD should return by value", decl);
8921 for (; argtypes && argtypes != void_list_node;
8922 argtypes = TREE_CHAIN (argtypes))
8923 if (TREE_PURPOSE (argtypes))
8925 TREE_PURPOSE (argtypes) = NULL_TREE;
8926 if (operator_code == POSTINCREMENT_EXPR
8927 || operator_code == POSTDECREMENT_EXPR)
8930 pedwarn ("%qD cannot have default arguments", decl);
8933 error ("%qD cannot have default arguments", decl);
8940 /* Return a string giving the keyword associate with CODE. */
8943 tag_name (enum tag_types code)
8962 /* Name lookup in an elaborated-type-specifier (after the keyword
8963 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
8964 elaborated-type-specifier is invalid, issue a diagnostic and return
8965 error_mark_node; otherwise, return the *_TYPE to which it referred.
8966 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
8969 check_elaborated_type_specifier (enum tag_types tag_code,
8971 bool allow_template_p)
8977 struct S { struct S *p; };
8979 name lookup will find the TYPE_DECL for the implicit "S::S"
8980 typedef. Adjust for that here. */
8981 if (DECL_SELF_REFERENCE_P (decl))
8982 decl = TYPE_NAME (TREE_TYPE (decl));
8984 type = TREE_TYPE (decl);
8986 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
8987 is false for this case as well. */
8988 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8990 error ("using template type parameter %qT after %qs",
8991 type, tag_name (tag_code));
8992 return error_mark_node;
8996 If the identifier resolves to a typedef-name or a template
8997 type-parameter, the elaborated-type-specifier is ill-formed.
8999 In other words, the only legitimate declaration to use in the
9000 elaborated type specifier is the implicit typedef created when
9001 the type is declared. */
9002 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9003 && tag_code != typename_type)
9005 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9006 cp_error_at ("%qD has a previous declaration here", decl);
9007 return error_mark_node;
9009 else if (TREE_CODE (type) != RECORD_TYPE
9010 && TREE_CODE (type) != UNION_TYPE
9011 && tag_code != enum_type
9012 && tag_code != typename_type)
9014 error ("%qT referred to as %qs", type, tag_name (tag_code));
9015 cp_error_at ("%qT has a previous declaration here", type);
9016 return error_mark_node;
9018 else if (TREE_CODE (type) != ENUMERAL_TYPE
9019 && tag_code == enum_type
9020 && tag_code != typename_type)
9022 error ("%qT referred to as enum", type);
9023 cp_error_at ("%qT has a previous declaration here", type);
9024 return error_mark_node;
9026 else if (!allow_template_p
9027 && TREE_CODE (type) == RECORD_TYPE
9028 && CLASSTYPE_IS_TEMPLATE (type))
9030 /* If a class template appears as elaborated type specifier
9031 without a template header such as:
9033 template <class T> class C {};
9034 void f(class C); // No template header here
9036 then the required template argument is missing. */
9037 error ("template argument required for %<%s %T%>",
9038 tag_name (tag_code),
9039 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9040 return error_mark_node;
9046 /* Lookup NAME in elaborate type specifier in scope according to
9047 SCOPE and issue diagnostics if necessary.
9048 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9049 found, and ERROR_MARK_NODE for type error. */
9052 lookup_and_check_tag (enum tag_types tag_code, tree name,
9053 tag_scope scope, bool template_header_p)
9057 if (scope == ts_global)
9059 /* First try ordinary name lookup, ignoring hidden class name
9060 injected via friend declaration. */
9061 decl = lookup_name (name, 2);
9062 /* If that fails, the name will be placed in the smallest
9063 non-class, non-function-prototype scope according to 3.3.1/5.
9064 We may already have a hidden name declared as friend in this
9065 scope. So lookup again but not ignoring hidden name.
9066 If we find one, that name will be made visible rather than
9067 creating a new tag. */
9069 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9072 decl = lookup_type_scope (name, scope);
9074 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9075 decl = DECL_TEMPLATE_RESULT (decl);
9077 if (decl && TREE_CODE (decl) == TYPE_DECL)
9079 /* Look for invalid nested type:
9083 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9085 error ("%qD has the same name as the class in which it is "
9088 return error_mark_node;
9091 /* Two cases we need to consider when deciding if a class
9092 template is allowed as an elaborated type specifier:
9093 1. It is a self reference to its own class.
9094 2. It comes with a template header.
9098 template <class T> class C {
9099 class C *c1; // DECL_SELF_REFERENCE_P is true
9102 template <class U> class C; // template_header_p is true
9103 template <class T> class C<T>::D {
9104 class C *c2; // DECL_SELF_REFERENCE_P is true
9107 t = check_elaborated_type_specifier (tag_code,
9110 | DECL_SELF_REFERENCE_P (decl));
9117 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9118 Define the tag as a forward-reference if it is not defined.
9120 If a declaration is given, process it here, and report an error if
9121 multiple declarations are not identical.
9123 SCOPE is TS_CURRENT when this is also a definition. Only look in
9124 the current frame for the name (since C++ allows new names in any
9125 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9126 declaration. Only look beginning from the current scope outward up
9127 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9129 TEMPLATE_HEADER_P is true when this declaration is preceded by
9130 a set of template parameters. */
9133 xref_tag (enum tag_types tag_code, tree name,
9134 tag_scope scope, bool template_header_p)
9136 enum tree_code code;
9138 tree context = NULL_TREE;
9140 timevar_push (TV_NAME_LOOKUP);
9142 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9154 code = ENUMERAL_TYPE;
9160 /* In case of anonymous name, xref_tag is only called to
9161 make type node and push name. Name lookup is not required. */
9162 if (ANON_AGGRNAME_P (name))
9165 t = lookup_and_check_tag (tag_code, name,
9166 scope, template_header_p);
9168 if (t == error_mark_node)
9169 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9171 if (scope != ts_current && t && current_class_type
9172 && template_class_depth (current_class_type)
9173 && template_header_p)
9175 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9176 definition of this tag. Since, in addition, we are currently
9177 processing a (member) template declaration of a template
9178 class, we must be very careful; consider:
9185 { template <class V>
9186 friend struct S1; };
9188 Here, the S2::S1 declaration should not be confused with the
9189 outer declaration. In particular, the inner version should
9190 have a template parameter of level 2, not level 1. This
9191 would be particularly important if the member declaration
9194 template <class V = U> friend struct S1;
9196 say, when we should tsubst into `U' when instantiating
9197 S2. On the other hand, when presented with:
9207 we must find the inner binding eventually. We
9208 accomplish this by making sure that the new type we
9209 create to represent this declaration has the right
9211 context = TYPE_CONTEXT (t);
9217 /* If no such tag is yet defined, create a forward-reference node
9218 and record it as the "definition".
9219 When a real declaration of this type is found,
9220 the forward-reference will be altered into a real type. */
9221 if (code == ENUMERAL_TYPE)
9223 error ("use of enum %q#D without previous declaration", name);
9224 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9228 t = make_aggr_type (code);
9229 TYPE_CONTEXT (t) = context;
9230 t = pushtag (name, t, scope);
9235 if (template_header_p && IS_AGGR_TYPE (t))
9236 redeclare_class_template (t, current_template_parms);
9237 else if (!processing_template_decl
9239 && CLASSTYPE_IS_TEMPLATE (t))
9241 error ("redeclaration of %qT as a non-template", t);
9242 t = error_mark_node;
9245 /* Make injected friend class visible. */
9246 if (scope != ts_within_enclosing_non_class
9247 && hidden_name_p (TYPE_NAME (t)))
9249 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9250 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9252 if (TYPE_TEMPLATE_INFO (t))
9254 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9255 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9260 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9264 xref_tag_from_type (tree old, tree id, tag_scope scope)
9266 enum tag_types tag_kind;
9268 if (TREE_CODE (old) == RECORD_TYPE)
9269 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9271 tag_kind = union_type;
9273 if (id == NULL_TREE)
9274 id = TYPE_IDENTIFIER (old);
9276 return xref_tag (tag_kind, id, scope, false);
9279 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9280 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9281 access_* node, and the TREE_VALUE is the type of the base-class.
9282 Non-NULL TREE_TYPE indicates virtual inheritance. */
9285 xref_basetypes (tree ref, tree base_list)
9288 tree binfo, base_binfo;
9289 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9290 unsigned max_bases = 0; /* Maximum direct bases. */
9292 tree default_access;
9293 tree igo_prev; /* Track Inheritance Graph Order. */
9295 if (ref == error_mark_node)
9298 /* The base of a derived class is private by default, all others are
9300 default_access = (TREE_CODE (ref) == RECORD_TYPE
9301 && CLASSTYPE_DECLARED_CLASS (ref)
9302 ? access_private_node : access_public_node);
9304 /* First, make sure that any templates in base-classes are
9305 instantiated. This ensures that if we call ourselves recursively
9306 we do not get confused about which classes are marked and which
9311 tree basetype = TREE_VALUE (*basep);
9313 if (!(processing_template_decl && uses_template_parms (basetype))
9314 && !complete_type_or_else (basetype, NULL))
9315 /* An incomplete type. Remove it from the list. */
9316 *basep = TREE_CHAIN (*basep);
9320 if (TREE_TYPE (*basep))
9322 if (CLASS_TYPE_P (basetype))
9323 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9324 basep = &TREE_CHAIN (*basep);
9328 TYPE_MARKED_P (ref) = 1;
9330 /* The binfo slot should be empty, unless this is an (ill-formed)
9332 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9333 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9335 binfo = make_tree_binfo (max_bases);
9337 TYPE_BINFO (ref) = binfo;
9338 BINFO_OFFSET (binfo) = size_zero_node;
9339 BINFO_TYPE (binfo) = ref;
9343 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9344 /* An aggregate cannot have baseclasses. */
9345 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9347 if (TREE_CODE (ref) == UNION_TYPE)
9348 error ("derived union %qT invalid", ref);
9353 if (TYPE_FOR_JAVA (ref))
9354 error ("Java class %qT cannot have multiple bases", ref);
9359 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9361 if (TYPE_FOR_JAVA (ref))
9362 error ("Java class %qT cannot have virtual bases", ref);
9365 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9367 tree access = TREE_PURPOSE (base_list);
9368 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9369 tree basetype = TREE_VALUE (base_list);
9371 if (access == access_default_node)
9372 access = default_access;
9374 if (TREE_CODE (basetype) == TYPE_DECL)
9375 basetype = TREE_TYPE (basetype);
9376 if (TREE_CODE (basetype) != RECORD_TYPE
9377 && TREE_CODE (basetype) != TYPENAME_TYPE
9378 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9379 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9381 error ("base type %qT fails to be a struct or class type",
9386 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9387 TYPE_FOR_JAVA (ref) = 1;
9389 base_binfo = NULL_TREE;
9390 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9392 base_binfo = TYPE_BINFO (basetype);
9393 /* The original basetype could have been a typedef'd type. */
9394 basetype = BINFO_TYPE (base_binfo);
9396 /* Inherit flags from the base. */
9397 TYPE_HAS_NEW_OPERATOR (ref)
9398 |= TYPE_HAS_NEW_OPERATOR (basetype);
9399 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9400 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9401 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9402 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9403 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9404 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9405 CLASSTYPE_REPEATED_BASE_P (ref)
9406 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9409 /* We must do this test after we've seen through a typedef
9411 if (TYPE_MARKED_P (basetype))
9413 if (basetype == ref)
9414 error ("recursive type %qT undefined", basetype);
9416 error ("duplicate base type %qT invalid", basetype);
9419 TYPE_MARKED_P (basetype) = 1;
9421 base_binfo = copy_binfo (base_binfo, basetype, ref,
9422 &igo_prev, via_virtual);
9423 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9424 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9426 BINFO_BASE_APPEND (binfo, base_binfo);
9427 BINFO_BASE_ACCESS_APPEND (binfo, access);
9430 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9431 /* If we have space in the vbase vector, we must have shared at
9432 least one of them, and are therefore diamond shaped. */
9433 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9435 /* Unmark all the types. */
9436 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9437 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9438 TYPE_MARKED_P (ref) = 0;
9440 /* Now see if we have a repeated base type. */
9441 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9443 for (base_binfo = binfo; base_binfo;
9444 base_binfo = TREE_CHAIN (base_binfo))
9446 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9448 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9451 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9453 for (base_binfo = binfo; base_binfo;
9454 base_binfo = TREE_CHAIN (base_binfo))
9455 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9456 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9463 /* Begin compiling the definition of an enumeration type.
9465 Returns the type object, as yet incomplete.
9466 Also records info about it so that build_enumerator
9467 may be used to declare the individual values as they are read. */
9470 start_enum (tree name)
9474 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9476 /* If this is the real definition for a previous forward reference,
9477 fill in the contents in the same object that used to be the
9478 forward reference. */
9480 enumtype = lookup_and_check_tag (enum_type, name,
9481 /*tag_scope=*/ts_current,
9482 /*template_header_p=*/false);
9484 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9486 error ("multiple definition of %q#T", enumtype);
9487 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9488 /* Clear out TYPE_VALUES, and start again. */
9489 TYPE_VALUES (enumtype) = NULL_TREE;
9493 /* In case of error, make a dummy enum to allow parsing to
9495 if (enumtype == error_mark_node)
9496 name = make_anon_name ();
9498 enumtype = make_node (ENUMERAL_TYPE);
9499 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9505 /* After processing and defining all the values of an enumeration type,
9506 install their decls in the enumeration type and finish it off.
9507 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9510 finish_enum (tree enumtype)
9519 bool use_short_enum;
9523 integer_type_kind itk;
9524 tree underlying_type = NULL_TREE;
9526 /* We built up the VALUES in reverse order. */
9527 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9529 /* For an enum defined in a template, just set the type of the values;
9530 all further processing is postponed until the template is
9531 instantiated. We need to set the type so that tsubst of a CONST_DECL
9533 if (processing_template_decl)
9535 for (values = TYPE_VALUES (enumtype);
9537 values = TREE_CHAIN (values))
9538 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9539 if (at_function_scope_p ())
9540 add_stmt (build_min (TAG_DEFN, enumtype));
9544 /* Determine the minimum and maximum values of the enumerators. */
9545 if (TYPE_VALUES (enumtype))
9547 minnode = maxnode = NULL_TREE;
9549 for (values = TYPE_VALUES (enumtype);
9551 values = TREE_CHAIN (values))
9553 decl = TREE_VALUE (values);
9555 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9556 each enumerator has the type of its enumeration. Prior to the
9557 closing brace, the type of each enumerator is the type of its
9558 initializing value. */
9559 TREE_TYPE (decl) = enumtype;
9561 /* Update the minimum and maximum values, if appropriate. */
9562 value = DECL_INITIAL (decl);
9563 /* Figure out what the minimum and maximum values of the
9566 minnode = maxnode = value;
9567 else if (tree_int_cst_lt (maxnode, value))
9569 else if (tree_int_cst_lt (value, minnode))
9576 If the enumerator-list is empty, the underlying type is as if
9577 the enumeration had a single enumerator with value 0. */
9578 minnode = maxnode = integer_zero_node;
9580 /* Compute the number of bits require to represent all values of the
9581 enumeration. We must do this before the type of MINNODE and
9582 MAXNODE are transformed, since min_precision relies on the
9583 TREE_TYPE of the value it is passed. */
9584 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9585 lowprec = min_precision (minnode, unsignedp);
9586 highprec = min_precision (maxnode, unsignedp);
9587 precision = MAX (lowprec, highprec);
9589 /* Determine the underlying type of the enumeration.
9593 The underlying type of an enumeration is an integral type that
9594 can represent all the enumerator values defined in the
9595 enumeration. It is implementation-defined which integral type is
9596 used as the underlying type for an enumeration except that the
9597 underlying type shall not be larger than int unless the value of
9598 an enumerator cannot fit in an int or unsigned int.
9600 We use "int" or an "unsigned int" as the underlying type, even if
9601 a smaller integral type would work, unless the user has
9602 explicitly requested that we use the smallest possible type. The
9603 user can request that for all enumerations with a command line
9604 flag, or for just one enumeration with an attribute. */
9606 use_short_enum = flag_short_enums
9607 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9609 for (itk = (use_short_enum ? itk_char : itk_int);
9613 underlying_type = integer_types[itk];
9614 if (TYPE_PRECISION (underlying_type) >= precision
9615 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9618 if (itk == itk_none)
9622 IF no integral type can represent all the enumerator values, the
9623 enumeration is ill-formed. */
9624 error ("no integral type can represent all of the enumerator values "
9625 "for %qT", enumtype);
9626 precision = TYPE_PRECISION (long_long_integer_type_node);
9627 underlying_type = integer_types[itk_unsigned_long_long];
9630 /* Compute the minium and maximum values for the type.
9634 For an enumeration where emin is the smallest enumerator and emax
9635 is the largest, the values of the enumeration are the values of the
9636 underlying type in the range bmin to bmax, where bmin and bmax are,
9637 respectively, the smallest and largest values of the smallest bit-
9638 field that can store emin and emax. */
9640 /* The middle-end currently assumes that types with TYPE_PRECISION
9641 narrower than their underlying type are suitably zero or sign
9642 extended to fill their mode. g++ doesn't make these guarantees.
9643 Until the middle-end can represent such paradoxical types, we
9644 set the TYPE_PRECISION to the width of the underlying type. */
9645 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9647 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9651 The value of sizeof() applied to an enumeration type, an object
9652 of an enumeration type, or an enumerator, is the value of sizeof()
9653 applied to the underlying type. */
9654 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9655 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9656 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9657 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9658 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9659 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9661 /* Convert each of the enumerators to the type of the underlying
9662 type of the enumeration. */
9663 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9665 decl = TREE_VALUE (values);
9666 value = perform_implicit_conversion (underlying_type,
9667 DECL_INITIAL (decl));
9669 /* Do not clobber shared ints. */
9670 value = copy_node (value);
9672 TREE_TYPE (value) = enumtype;
9673 DECL_INITIAL (decl) = value;
9674 TREE_VALUE (values) = value;
9677 /* Fix up all variant types of this enum type. */
9678 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9680 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9681 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9682 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9683 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9684 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9685 TYPE_MODE (t) = TYPE_MODE (enumtype);
9686 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9687 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9688 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9689 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9692 /* Finish debugging output for this type. */
9693 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9696 /* Build and install a CONST_DECL for an enumeration constant of the
9697 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9698 Assignment of sequential values by default is handled here. */
9701 build_enumerator (tree name, tree value, tree enumtype)
9707 /* If the VALUE was erroneous, pretend it wasn't there; that will
9708 result in the enum being assigned the next value in sequence. */
9709 if (value == error_mark_node)
9712 /* Remove no-op casts from the value. */
9714 STRIP_TYPE_NOPS (value);
9716 if (! processing_template_decl)
9718 /* Validate and default VALUE. */
9719 if (value != NULL_TREE)
9721 value = integral_constant_value (value);
9723 if (TREE_CODE (value) == INTEGER_CST)
9725 value = perform_integral_promotions (value);
9726 constant_expression_warning (value);
9730 error ("enumerator value for %qD not integer constant", name);
9735 /* Default based on previous value. */
9736 if (value == NULL_TREE)
9738 if (TYPE_VALUES (enumtype))
9741 unsigned HOST_WIDE_INT lo;
9745 /* The next value is the previous value plus one. We can
9746 safely assume that the previous value is an INTEGER_CST.
9747 add_double doesn't know the type of the target expression,
9748 so we must check with int_fits_type_p as well. */
9749 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9750 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9751 TREE_INT_CST_HIGH (prev_value),
9753 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9754 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
9757 error ("overflow in enumeration values at %qD", name);
9760 value = integer_zero_node;
9763 /* Remove no-op casts from the value. */
9764 STRIP_TYPE_NOPS (value);
9767 /* C++ associates enums with global, function, or class declarations. */
9768 context = current_scope ();
9770 /* Build the actual enumeration constant. Note that the enumeration
9771 constants have the type of their initializers until the
9772 enumeration is complete:
9776 Following the closing brace of an enum-specifier, each enumer-
9777 ator has the type of its enumeration. Prior to the closing
9778 brace, the type of each enumerator is the type of its
9781 In finish_enum we will reset the type. Of course, if we're
9782 processing a template, there may be no value. */
9783 type = value ? TREE_TYPE (value) : NULL_TREE;
9785 if (context && context == current_class_type)
9786 /* This enum declaration is local to the class. We need the full
9787 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9788 decl = build_lang_decl (CONST_DECL, name, type);
9790 /* It's a global enum, or it's local to a function. (Note local to
9791 a function could mean local to a class method. */
9792 decl = build_decl (CONST_DECL, name, type);
9794 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
9795 TREE_CONSTANT (decl) = 1;
9796 TREE_INVARIANT (decl) = 1;
9797 TREE_READONLY (decl) = 1;
9798 DECL_INITIAL (decl) = value;
9800 if (context && context == current_class_type)
9801 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
9802 on the TYPE_FIELDS list for `S'. (That's so that you can say
9803 things like `S::i' later.) */
9804 finish_member_declaration (decl);
9808 /* Add this enumeration constant to the list for this type. */
9809 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
9813 /* We're defining DECL. Make sure that it's type is OK. */
9816 check_function_type (tree decl, tree current_function_parms)
9818 tree fntype = TREE_TYPE (decl);
9819 tree return_type = complete_type (TREE_TYPE (fntype));
9821 /* In a function definition, arg types must be complete. */
9822 require_complete_types_for_parms (current_function_parms);
9824 if (dependent_type_p (return_type))
9826 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
9828 error ("return type %q#T is incomplete", TREE_TYPE (fntype));
9830 /* Make it return void instead, but don't change the
9831 type of the DECL_RESULT, in case we have a named return value. */
9832 if (TREE_CODE (fntype) == METHOD_TYPE)
9834 tree ctype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype)));
9836 = build_method_type_directly (ctype,
9838 FUNCTION_ARG_CHAIN (decl));
9842 = build_function_type (void_type_node,
9843 TYPE_ARG_TYPES (TREE_TYPE (decl)));
9845 = build_exception_variant (fntype,
9846 TYPE_RAISES_EXCEPTIONS (fntype));
9849 abstract_virtuals_error (decl, TREE_TYPE (fntype));
9852 /* Create the FUNCTION_DECL for a function definition.
9853 DECLSPECS and DECLARATOR are the parts of the declaration;
9854 they describe the function's name and the type it returns,
9855 but twisted together in a fashion that parallels the syntax of C.
9857 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
9858 DECLARATOR is really the DECL for the function we are about to
9859 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
9860 indicating that the function is an inline defined in-class.
9862 This function creates a binding context for the function body
9863 as well as setting up the FUNCTION_DECL in current_function_decl.
9865 For C++, we must first check whether that datum makes any sense.
9866 For example, "class A local_a(1,2);" means that variable local_a
9867 is an aggregate of type A, which should have a constructor
9868 applied to it with the argument list [1, 2]. */
9871 start_preparsed_function (tree decl1, tree attrs, int flags)
9873 tree ctype = NULL_TREE;
9876 int doing_friend = 0;
9877 struct cp_binding_level *bl;
9878 tree current_function_parms;
9879 struct c_fileinfo *finfo = get_fileinfo (lbasename (input_filename));
9882 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
9883 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
9885 fntype = TREE_TYPE (decl1);
9886 if (TREE_CODE (fntype) == METHOD_TYPE)
9887 ctype = TYPE_METHOD_BASETYPE (fntype);
9889 /* ISO C++ 11.4/5. A friend function defined in a class is in
9890 the (lexical) scope of the class in which it is defined. */
9891 if (!ctype && DECL_FRIEND_P (decl1))
9893 ctype = DECL_FRIEND_CONTEXT (decl1);
9895 /* CTYPE could be null here if we're dealing with a template;
9896 for example, `inline friend float foo()' inside a template
9897 will have no CTYPE set. */
9898 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
9904 if (DECL_DECLARED_INLINE_P (decl1)
9905 && lookup_attribute ("noinline", attrs))
9906 warning (0, "%Jinline function %qD given attribute noinline", decl1, decl1);
9908 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
9909 /* This is a constructor, we must ensure that any default args
9910 introduced by this definition are propagated to the clones
9911 now. The clones are used directly in overload resolution. */
9912 adjust_clone_args (decl1);
9914 /* Sometimes we don't notice that a function is a static member, and
9915 build a METHOD_TYPE for it. Fix that up now. */
9916 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
9917 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
9919 revert_static_member_fn (decl1);
9923 /* Set up current_class_type, and enter the scope of the class, if
9926 push_nested_class (ctype);
9927 else if (DECL_STATIC_FUNCTION_P (decl1))
9928 push_nested_class (DECL_CONTEXT (decl1));
9930 /* Now that we have entered the scope of the class, we must restore
9931 the bindings for any template parameters surrounding DECL1, if it
9932 is an inline member template. (Order is important; consider the
9933 case where a template parameter has the same name as a field of
9934 the class.) It is not until after this point that
9935 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
9936 if (flags & SF_INCLASS_INLINE)
9937 maybe_begin_member_template_processing (decl1);
9939 /* Effective C++ rule 15. */
9941 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
9942 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
9943 warning (0, "%<operator=%> should return a reference to %<*this%>");
9945 /* Make the init_value nonzero so pushdecl knows this is not tentative.
9946 error_mark_node is replaced below (in poplevel) with the BLOCK. */
9947 if (!DECL_INITIAL (decl1))
9948 DECL_INITIAL (decl1) = error_mark_node;
9950 /* This function exists in static storage.
9951 (This does not mean `static' in the C sense!) */
9952 TREE_STATIC (decl1) = 1;
9954 /* We must call push_template_decl after current_class_type is set
9955 up. (If we are processing inline definitions after exiting a
9956 class scope, current_class_type will be NULL_TREE until set above
9957 by push_nested_class.) */
9958 if (processing_template_decl)
9960 /* FIXME: Handle error_mark_node more gracefully. */
9961 tree newdecl1 = push_template_decl (decl1);
9962 if (newdecl1 != error_mark_node)
9966 /* We are now in the scope of the function being defined. */
9967 current_function_decl = decl1;
9969 /* Save the parm names or decls from this function's declarator
9970 where store_parm_decls will find them. */
9971 current_function_parms = DECL_ARGUMENTS (decl1);
9973 /* Make sure the parameter and return types are reasonable. When
9974 you declare a function, these types can be incomplete, but they
9975 must be complete when you define the function. */
9976 check_function_type (decl1, current_function_parms);
9978 /* Build the return declaration for the function. */
9979 restype = TREE_TYPE (fntype);
9980 /* Promote the value to int before returning it. */
9981 if (c_promoting_integer_type_p (restype))
9982 restype = type_promotes_to (restype);
9983 if (DECL_RESULT (decl1) == NULL_TREE)
9987 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
9988 DECL_ARTIFICIAL (resdecl) = 1;
9989 DECL_IGNORED_P (resdecl) = 1;
9990 DECL_RESULT (decl1) = resdecl;
9992 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
9995 /* Initialize RTL machinery. We cannot do this until
9996 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
9997 even when processing a template; this is how we get
9998 CFUN set up, and our per-function variables initialized.
9999 FIXME factor out the non-RTL stuff. */
10000 bl = current_binding_level;
10001 allocate_struct_function (decl1);
10002 current_binding_level = bl;
10004 /* Even though we're inside a function body, we still don't want to
10005 call expand_expr to calculate the size of a variable-sized array.
10006 We haven't necessarily assigned RTL to all variables yet, so it's
10007 not safe to try to expand expressions involving them. */
10008 cfun->x_dont_save_pending_sizes_p = 1;
10010 /* Start the statement-tree, start the tree now. */
10011 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10013 /* Let the user know we're compiling this function. */
10014 announce_function (decl1);
10016 /* Record the decl so that the function name is defined.
10017 If we already have a decl for this name, and it is a FUNCTION_DECL,
10018 use the old decl. */
10019 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10021 /* A specialization is not used to guide overload resolution. */
10022 if (!DECL_FUNCTION_MEMBER_P (decl1)
10023 && !(DECL_USE_TEMPLATE (decl1) &&
10024 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10026 tree olddecl = pushdecl (decl1);
10028 if (olddecl == error_mark_node)
10029 /* If something went wrong when registering the declaration,
10030 use DECL1; we have to have a FUNCTION_DECL to use when
10031 parsing the body of the function. */
10034 /* Otherwise, OLDDECL is either a previous declaration of
10035 the same function or DECL1 itself. */
10040 /* We need to set the DECL_CONTEXT. */
10041 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10042 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10043 /* And make sure we have enough default args. */
10044 check_default_args (decl1);
10046 fntype = TREE_TYPE (decl1);
10049 /* Determine the ELF visibility attribute for the function. We must
10050 not do this before calling "pushdecl", as we must allow
10051 "duplicate_decls" to merge any attributes appropriately. */
10052 if (!DECL_CLONED_FUNCTION_P (decl1))
10053 determine_visibility (decl1);
10055 /* Reset these in case the call to pushdecl changed them. */
10056 current_function_decl = decl1;
10057 cfun->decl = decl1;
10059 /* If we are (erroneously) defining a function that we have already
10060 defined before, wipe out what we knew before. */
10061 if (!DECL_PENDING_INLINE_P (decl1))
10062 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10064 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10066 /* We know that this was set up by `grokclassfn'. We do not
10067 wait until `store_parm_decls', since evil parse errors may
10068 never get us to that point. Here we keep the consistency
10069 between `current_class_type' and `current_class_ptr'. */
10070 tree t = DECL_ARGUMENTS (decl1);
10072 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10073 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10075 cp_function_chain->x_current_class_ref
10076 = build_indirect_ref (t, NULL);
10077 cp_function_chain->x_current_class_ptr = t;
10079 /* Constructors and destructors need to know whether they're "in
10080 charge" of initializing virtual base classes. */
10081 t = TREE_CHAIN (t);
10082 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10084 current_in_charge_parm = t;
10085 t = TREE_CHAIN (t);
10087 if (DECL_HAS_VTT_PARM_P (decl1))
10089 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10090 current_vtt_parm = t;
10094 if (DECL_INTERFACE_KNOWN (decl1))
10096 tree ctx = decl_function_context (decl1);
10098 if (DECL_NOT_REALLY_EXTERN (decl1))
10099 DECL_EXTERNAL (decl1) = 0;
10101 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10102 && TREE_PUBLIC (ctx))
10103 /* This is a function in a local class in an extern inline
10105 comdat_linkage (decl1);
10107 /* If this function belongs to an interface, it is public.
10108 If it belongs to someone else's interface, it is also external.
10109 This only affects inlines and template instantiations. */
10110 else if (finfo->interface_unknown == 0
10111 && ! DECL_TEMPLATE_INSTANTIATION (decl1))
10113 if (DECL_DECLARED_INLINE_P (decl1)
10114 || DECL_TEMPLATE_INSTANTIATION (decl1)
10115 || processing_template_decl)
10117 DECL_EXTERNAL (decl1)
10118 = (finfo->interface_only
10119 || (DECL_DECLARED_INLINE_P (decl1)
10120 && ! flag_implement_inlines
10121 && !DECL_VINDEX (decl1)));
10123 /* For WIN32 we also want to put these in linkonce sections. */
10124 maybe_make_one_only (decl1);
10127 DECL_EXTERNAL (decl1) = 0;
10128 DECL_NOT_REALLY_EXTERN (decl1) = 0;
10129 DECL_INTERFACE_KNOWN (decl1) = 1;
10130 /* If this function is in an interface implemented in this file,
10131 make sure that the backend knows to emit this function
10133 if (!DECL_EXTERNAL (decl1))
10134 mark_needed (decl1);
10136 else if (finfo->interface_unknown && finfo->interface_only
10137 && ! DECL_TEMPLATE_INSTANTIATION (decl1))
10139 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10140 interface, we will have both finfo->interface_unknown and
10141 finfo->interface_only set. In that case, we don't want to
10142 use the normal heuristics because someone will supply a
10143 #pragma implementation elsewhere, and deducing it here would
10144 produce a conflict. */
10145 comdat_linkage (decl1);
10146 DECL_EXTERNAL (decl1) = 0;
10147 DECL_INTERFACE_KNOWN (decl1) = 1;
10148 DECL_DEFER_OUTPUT (decl1) = 1;
10152 /* This is a definition, not a reference.
10153 So clear DECL_EXTERNAL. */
10154 DECL_EXTERNAL (decl1) = 0;
10156 if ((DECL_DECLARED_INLINE_P (decl1)
10157 || DECL_TEMPLATE_INSTANTIATION (decl1))
10158 && ! DECL_INTERFACE_KNOWN (decl1)
10159 /* Don't try to defer nested functions for now. */
10160 && ! decl_function_context (decl1))
10161 DECL_DEFER_OUTPUT (decl1) = 1;
10163 DECL_INTERFACE_KNOWN (decl1) = 1;
10166 begin_scope (sk_function_parms, decl1);
10170 if (DECL_DESTRUCTOR_P (decl1)
10171 || (DECL_CONSTRUCTOR_P (decl1)
10172 && targetm.cxx.cdtor_returns_this ()))
10174 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10175 DECL_CONTEXT (cdtor_label) = current_function_decl;
10178 start_fname_decls ();
10180 store_parm_decls (current_function_parms);
10184 /* Like start_preparsed_function, except that instead of a
10185 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10187 Returns 1 on success. If the DECLARATOR is not suitable for a function
10188 (it defines a datum instead), we return 0, which tells
10189 yyparse to report a parse error. */
10192 start_function (cp_decl_specifier_seq *declspecs,
10193 const cp_declarator *declarator,
10198 if (have_extern_spec)
10200 declspecs->storage_class = sc_extern;
10201 /* This should only be done once on the outermost decl. */
10202 have_extern_spec = false;
10205 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10206 /* If the declarator is not suitable for a function definition,
10207 cause a syntax error. */
10208 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10211 /* If #pragma weak was used, mark the decl weak now. */
10212 if (global_scope_p (current_binding_level))
10213 maybe_apply_pragma_weak (decl1);
10215 if (DECL_MAIN_P (decl1))
10216 /* main must return int. grokfndecl should have corrected it
10217 (and issued a diagnostic) if the user got it wrong. */
10218 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10219 integer_type_node));
10221 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10226 /* Store the parameter declarations into the current function declaration.
10227 This is called after parsing the parameter declarations, before
10228 digesting the body of the function.
10230 Also install to binding contour return value identifier, if any. */
10233 store_parm_decls (tree current_function_parms)
10235 tree fndecl = current_function_decl;
10238 /* This is a chain of any other decls that came in among the parm
10239 declarations. If a parm is declared with enum {foo, bar} x;
10240 then CONST_DECLs for foo and bar are put here. */
10241 tree nonparms = NULL_TREE;
10243 if (current_function_parms)
10245 /* This case is when the function was defined with an ANSI prototype.
10246 The parms already have decls, so we need not do anything here
10247 except record them as in effect
10248 and complain if any redundant old-style parm decls were written. */
10250 tree specparms = current_function_parms;
10253 /* Must clear this because it might contain TYPE_DECLs declared
10255 current_binding_level->names = NULL;
10257 /* If we're doing semantic analysis, then we'll call pushdecl
10258 for each of these. We must do them in reverse order so that
10259 they end in the correct forward order. */
10260 specparms = nreverse (specparms);
10262 for (parm = specparms; parm; parm = next)
10264 next = TREE_CHAIN (parm);
10265 if (TREE_CODE (parm) == PARM_DECL)
10267 if (DECL_NAME (parm) == NULL_TREE
10268 || TREE_CODE (parm) != VOID_TYPE)
10271 error ("parameter %qD declared void", parm);
10275 /* If we find an enum constant or a type tag,
10276 put it aside for the moment. */
10277 TREE_CHAIN (parm) = NULL_TREE;
10278 nonparms = chainon (nonparms, parm);
10282 /* Get the decls in their original chain order and record in the
10283 function. This is all and only the PARM_DECLs that were
10284 pushed into scope by the loop above. */
10285 DECL_ARGUMENTS (fndecl) = getdecls ();
10288 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10290 /* Now store the final chain of decls for the arguments
10291 as the decl-chain of the current lexical scope.
10292 Put the enumerators in as well, at the front so that
10293 DECL_ARGUMENTS is not modified. */
10294 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10296 /* For a cloned function, we've already got all the code we need;
10297 there's no need to add any extra bits. */
10298 if (!DECL_CLONED_FUNCTION_P (fndecl))
10300 /* Do the starting of the exception specifications, if we have any. */
10301 if (flag_exceptions && !processing_template_decl
10302 && flag_enforce_eh_specs
10303 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10304 current_eh_spec_block = begin_eh_spec_block ();
10309 /* We have finished doing semantic analysis on DECL, but have not yet
10310 generated RTL for its body. Save away our current state, so that
10311 when we want to generate RTL later we know what to do. */
10314 save_function_data (tree decl)
10316 struct language_function *f;
10318 /* Save the language-specific per-function data so that we can
10319 get it back when we really expand this function. */
10320 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10323 f = GGC_NEW (struct language_function);
10324 memcpy (f, cp_function_chain, sizeof (struct language_function));
10325 DECL_SAVED_FUNCTION_DATA (decl) = f;
10327 /* Clear out the bits we don't need. */
10328 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10329 f->x_named_label_uses = NULL;
10330 f->bindings = NULL;
10331 f->x_local_names = NULL;
10335 /* Set the return value of the constructor (if present). */
10338 finish_constructor_body (void)
10343 if (targetm.cxx.cdtor_returns_this ())
10345 /* Any return from a constructor will end up here. */
10346 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10348 val = DECL_ARGUMENTS (current_function_decl);
10349 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10350 DECL_RESULT (current_function_decl), val);
10351 /* Return the address of the object. */
10352 exprstmt = build_stmt (RETURN_EXPR, val);
10353 add_stmt (exprstmt);
10357 /* Do all the processing for the beginning of a destructor; set up the
10358 vtable pointers and cleanups for bases and members. */
10361 begin_destructor_body (void)
10364 tree compound_stmt;
10366 /* If the dtor is empty, and we know there is not any possible
10367 way we could use any vtable entries, before they are possibly
10368 set by a base class dtor, we don't have to setup the vtables,
10369 as we know that any base class dtor will set up any vtables
10370 it needs. We avoid MI, because one base class dtor can do a
10371 virtual dispatch to an overridden function that would need to
10372 have a non-related vtable set up, we cannot avoid setting up
10373 vtables in that case. We could change this to see if there
10374 is just one vtable.
10376 ??? In the destructor for a class, the vtables are set
10377 appropriately for that class. There will be no non-related
10378 vtables. jason 2001-12-11. */
10379 if_stmt = begin_if_stmt ();
10381 /* If it is not safe to avoid setting up the vtables, then
10382 someone will change the condition to be boolean_true_node.
10383 (Actually, for now, we do not have code to set the condition
10384 appropriately, so we just assume that we always need to
10385 initialize the vtables.) */
10386 finish_if_stmt_cond (boolean_true_node, if_stmt);
10388 compound_stmt = begin_compound_stmt (0);
10390 /* Make all virtual function table pointers in non-virtual base
10391 classes point to CURRENT_CLASS_TYPE's virtual function
10393 initialize_vtbl_ptrs (current_class_ptr);
10395 finish_compound_stmt (compound_stmt);
10396 finish_then_clause (if_stmt);
10397 finish_if_stmt (if_stmt);
10399 /* And insert cleanups for our bases and members so that they
10400 will be properly destroyed if we throw. */
10401 push_base_cleanups ();
10404 /* At the end of every destructor we generate code to delete the object if
10405 necessary. Do that now. */
10408 finish_destructor_body (void)
10412 /* Any return from a destructor will end up here; that way all base
10413 and member cleanups will be run when the function returns. */
10414 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10416 /* In a virtual destructor, we must call delete. */
10417 if (DECL_VIRTUAL_P (current_function_decl))
10420 tree virtual_size = cxx_sizeof (current_class_type);
10424 At the point of definition of a virtual destructor (including
10425 an implicit definition), non-placement operator delete shall
10426 be looked up in the scope of the destructor's class and if
10427 found shall be accessible and unambiguous. */
10428 exprstmt = build_op_delete_call
10429 (DELETE_EXPR, current_class_ptr, virtual_size,
10430 /*global_p=*/false, NULL_TREE);
10432 if_stmt = begin_if_stmt ();
10433 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10434 current_in_charge_parm,
10437 finish_expr_stmt (exprstmt);
10438 finish_then_clause (if_stmt);
10439 finish_if_stmt (if_stmt);
10442 if (targetm.cxx.cdtor_returns_this ())
10446 val = DECL_ARGUMENTS (current_function_decl);
10447 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10448 DECL_RESULT (current_function_decl), val);
10449 /* Return the address of the object. */
10450 exprstmt = build_stmt (RETURN_EXPR, val);
10451 add_stmt (exprstmt);
10455 /* Do the necessary processing for the beginning of a function body, which
10456 in this case includes member-initializers, but not the catch clauses of
10457 a function-try-block. Currently, this means opening a binding level
10458 for the member-initializers (in a ctor) and member cleanups (in a dtor).
10459 In other functions, this isn't necessary, but it doesn't hurt. */
10462 begin_function_body (void)
10466 if (processing_template_decl)
10467 /* Do nothing now. */;
10469 /* Always keep the BLOCK node associated with the outermost pair of
10470 curly braces of a function. These are needed for correct
10471 operation of dwarfout.c. */
10472 keep_next_level (true);
10474 stmt = begin_compound_stmt (BCS_FN_BODY);
10476 if (processing_template_decl)
10477 /* Do nothing now. */;
10478 else if (DECL_DESTRUCTOR_P (current_function_decl))
10479 begin_destructor_body ();
10484 /* Do the processing for the end of a function body. Currently, this means
10485 closing out the cleanups for fully-constructed bases and members, and in
10486 the case of the destructor, deleting the object if desired. Again, this
10487 is only meaningful for [cd]tors, since they are the only functions where
10488 there is a significant distinction between the main body and any
10489 function catch clauses. Handling, say, main() return semantics here
10490 would be wrong, as flowing off the end of a function catch clause for
10491 main() would also need to return 0. */
10494 finish_function_body (tree compstmt)
10496 /* Close the block. */
10497 finish_compound_stmt (compstmt);
10499 if (processing_template_decl)
10500 /* Do nothing now. */;
10501 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10502 finish_constructor_body ();
10503 else if (DECL_DESTRUCTOR_P (current_function_decl))
10504 finish_destructor_body ();
10507 /* Finish up a function declaration and compile that function
10508 all the way to assembler language output. The free the storage
10509 for the function definition.
10511 FLAGS is a bitwise or of the following values:
10513 We just finished processing the body of an in-class inline
10514 function definition. (This processing will have taken place
10515 after the class definition is complete.) */
10518 finish_function (int flags)
10520 tree fndecl = current_function_decl;
10521 tree fntype, ctype = NULL_TREE;
10522 int inclass_inline = (flags & 2) != 0;
10525 /* When we get some parse errors, we can end up without a
10526 current_function_decl, so cope. */
10527 if (fndecl == NULL_TREE)
10528 return error_mark_node;
10530 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10531 && DECL_VIRTUAL_P (fndecl)
10532 && !processing_template_decl)
10534 tree fnclass = DECL_CONTEXT (fndecl);
10535 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10536 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10539 nested = function_depth > 1;
10540 fntype = TREE_TYPE (fndecl);
10542 /* TREE_READONLY (fndecl) = 1;
10543 This caused &foo to be of type ptr-to-const-function
10544 which then got a warning when stored in a ptr-to-function variable. */
10546 gcc_assert (building_stmt_tree ());
10548 /* For a cloned function, we've already got all the code we need;
10549 there's no need to add any extra bits. */
10550 if (!DECL_CLONED_FUNCTION_P (fndecl))
10552 if (DECL_MAIN_P (current_function_decl))
10556 /* Make it so that `main' always returns 0 by default (or
10559 stmt = finish_return_stmt (integer_one_node);
10561 stmt = finish_return_stmt (integer_zero_node);
10563 /* Hack. We don't want the middle-end to warn that this
10564 return is unreachable, so put the statement on the
10566 #ifdef USE_MAPPED_LOCATION
10567 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10569 annotate_with_file_line (stmt, input_filename, 0);
10573 /* Finish dealing with exception specifiers. */
10574 if (flag_exceptions && !processing_template_decl
10575 && flag_enforce_eh_specs
10576 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10577 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10578 (TREE_TYPE (current_function_decl)),
10579 current_eh_spec_block);
10582 /* If we're saving up tree structure, tie off the function now. */
10583 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10585 finish_fname_decls ();
10587 /* If this function can't throw any exceptions, remember that. */
10588 if (!processing_template_decl
10589 && !cp_function_chain->can_throw
10590 && !flag_non_call_exceptions)
10591 TREE_NOTHROW (fndecl) = 1;
10593 /* This must come after expand_function_end because cleanups might
10594 have declarations (from inline functions) that need to go into
10595 this function's blocks. */
10597 /* If the current binding level isn't the outermost binding level
10598 for this function, either there is a bug, or we have experienced
10599 syntax errors and the statement tree is malformed. */
10600 if (current_binding_level->kind != sk_function_parms)
10602 /* Make sure we have already experienced errors. */
10603 gcc_assert (errorcount);
10605 /* Throw away the broken statement tree and extra binding
10607 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10609 while (current_binding_level->kind != sk_function_parms)
10611 if (current_binding_level->kind == sk_class)
10612 pop_nested_class ();
10614 poplevel (0, 0, 0);
10617 poplevel (1, 0, 1);
10619 /* Statements should always be full-expressions at the outermost set
10620 of curly braces for a function. */
10621 gcc_assert (stmts_are_full_exprs_p ());
10623 /* Set up the named return value optimization, if we can. Candidate
10624 variables are selected in check_return_value. */
10625 if (current_function_return_value)
10627 tree r = current_function_return_value;
10630 if (r != error_mark_node
10631 /* This is only worth doing for fns that return in memory--and
10632 simpler, since we don't have to worry about promoted modes. */
10633 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10634 /* Only allow this for variables declared in the outer scope of
10635 the function so we know that their lifetime always ends with a
10636 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10637 we were to do this optimization in tree-ssa. */
10638 && (outer = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl)))
10639 /* Skip the artificial function body block. */
10640 && (outer = BLOCK_SUBBLOCKS (outer))
10641 && chain_member (r, BLOCK_VARS (outer)))
10642 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10644 current_function_return_value = NULL_TREE;
10647 /* Remember that we were in class scope. */
10648 if (current_class_name)
10649 ctype = current_class_type;
10651 /* Must mark the RESULT_DECL as being in this function. */
10652 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10654 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10655 to the FUNCTION_DECL node itself. */
10656 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10658 /* Save away current state, if appropriate. */
10659 if (!processing_template_decl)
10660 save_function_data (fndecl);
10662 /* Complain if there's just no return statement. */
10663 if (warn_return_type
10664 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10665 && !dependent_type_p (TREE_TYPE (fntype))
10666 && !current_function_returns_value && !current_function_returns_null
10667 /* Don't complain if we abort or throw. */
10668 && !current_function_returns_abnormally
10669 && !DECL_NAME (DECL_RESULT (fndecl))
10670 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10671 inline function, as we might never be compiled separately. */
10672 && (DECL_INLINE (fndecl) || processing_template_decl)
10673 /* Structor return values (if any) are set by the compiler. */
10674 && !DECL_CONSTRUCTOR_P (fndecl)
10675 && !DECL_DESTRUCTOR_P (fndecl))
10676 warning (0, "no return statement in function returning non-void");
10678 /* Store the end of the function, so that we get good line number
10679 info for the epilogue. */
10680 cfun->function_end_locus = input_location;
10682 /* Genericize before inlining. */
10683 if (!processing_template_decl)
10685 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10686 cp_genericize (fndecl);
10687 /* Clear out the bits we don't need. */
10688 f->x_current_class_ptr = NULL;
10689 f->x_current_class_ref = NULL;
10690 f->x_eh_spec_block = NULL;
10691 f->x_in_charge_parm = NULL;
10692 f->x_vtt_parm = NULL;
10693 f->x_return_value = NULL;
10694 f->bindings = NULL;
10696 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10697 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10699 /* Clear out the bits we don't need. */
10700 local_names = NULL;
10701 named_label_uses = NULL;
10703 /* We're leaving the context of this function, so zap cfun. It's still in
10704 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10706 current_function_decl = NULL;
10708 /* If this is an in-class inline definition, we may have to pop the
10709 bindings for the template parameters that we added in
10710 maybe_begin_member_template_processing when start_function was
10712 if (inclass_inline)
10713 maybe_end_member_template_processing ();
10715 /* Leave the scope of the class. */
10717 pop_nested_class ();
10723 /* Let the error reporting routines know that we're outside a
10724 function. For a nested function, this value is used in
10725 cxx_pop_function_context and then reset via pop_function_context. */
10726 current_function_decl = NULL_TREE;
10731 /* Create the FUNCTION_DECL for a function definition.
10732 DECLSPECS and DECLARATOR are the parts of the declaration;
10733 they describe the return type and the name of the function,
10734 but twisted together in a fashion that parallels the syntax of C.
10736 This function creates a binding context for the function body
10737 as well as setting up the FUNCTION_DECL in current_function_decl.
10739 Returns a FUNCTION_DECL on success.
10741 If the DECLARATOR is not suitable for a function (it defines a datum
10742 instead), we return 0, which tells yyparse to report a parse error.
10744 May return void_type_node indicating that this method is actually
10745 a friend. See grokfield for more details.
10747 Came here with a `.pushlevel' .
10749 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10750 CHANGES TO CODE IN `grokfield'. */
10753 start_method (cp_decl_specifier_seq *declspecs,
10754 const cp_declarator *declarator, tree attrlist)
10756 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10759 if (fndecl == error_mark_node)
10760 return error_mark_node;
10762 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10764 error ("invalid member function declaration");
10765 return error_mark_node;
10769 cplus_decl_attributes (&fndecl, attrlist, 0);
10771 /* Pass friends other than inline friend functions back. */
10772 if (fndecl == void_type_node)
10775 if (DECL_IN_AGGR_P (fndecl))
10777 if (DECL_CONTEXT (fndecl)
10778 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
10779 error ("%qD is already defined in class %qT", fndecl,
10780 DECL_CONTEXT (fndecl));
10781 return void_type_node;
10784 check_template_shadow (fndecl);
10786 DECL_DECLARED_INLINE_P (fndecl) = 1;
10787 if (flag_default_inline)
10788 DECL_INLINE (fndecl) = 1;
10790 /* We process method specializations in finish_struct_1. */
10791 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
10793 fndecl = push_template_decl (fndecl);
10794 if (fndecl == error_mark_node)
10798 if (! DECL_FRIEND_P (fndecl))
10800 if (TREE_CHAIN (fndecl))
10802 fndecl = copy_node (fndecl);
10803 TREE_CHAIN (fndecl) = NULL_TREE;
10805 grok_special_member_properties (fndecl);
10808 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
10810 /* Make a place for the parms. */
10811 begin_scope (sk_function_parms, fndecl);
10813 DECL_IN_AGGR_P (fndecl) = 1;
10817 /* Go through the motions of finishing a function definition.
10818 We don't compile this method until after the whole class has
10821 FINISH_METHOD must return something that looks as though it
10822 came from GROKFIELD (since we are defining a method, after all).
10824 This is called after parsing the body of the function definition.
10825 STMTS is the chain of statements that makes up the function body.
10827 DECL is the ..._DECL that `start_method' provided. */
10830 finish_method (tree decl)
10832 tree fndecl = decl;
10837 if (decl == void_type_node)
10840 old_initial = DECL_INITIAL (fndecl);
10842 /* Undo the level for the parms (from start_method).
10843 This is like poplevel, but it causes nothing to be
10844 saved. Saving information here confuses symbol-table
10845 output routines. Besides, this information will
10846 be correctly output when this method is actually
10849 /* Clear out the meanings of the local variables of this level;
10850 also record in each decl which block it belongs to. */
10852 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
10854 if (DECL_NAME (link) != NULL_TREE)
10855 pop_binding (DECL_NAME (link), link);
10856 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
10857 DECL_CONTEXT (link) = NULL_TREE;
10860 poplevel (0, 0, 0);
10862 DECL_INITIAL (fndecl) = old_initial;
10864 /* We used to check if the context of FNDECL was different from
10865 current_class_type as another way to get inside here. This didn't work
10866 for String.cc in libg++. */
10867 if (DECL_FRIEND_P (fndecl))
10869 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
10871 decl = void_type_node;
10878 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
10879 we can lay it out later, when and if its type becomes complete. */
10882 maybe_register_incomplete_var (tree var)
10884 gcc_assert (TREE_CODE (var) == VAR_DECL);
10886 /* Keep track of variables with incomplete types. */
10887 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
10888 && DECL_EXTERNAL (var))
10890 tree inner_type = TREE_TYPE (var);
10892 while (TREE_CODE (inner_type) == ARRAY_TYPE)
10893 inner_type = TREE_TYPE (inner_type);
10894 inner_type = TYPE_MAIN_VARIANT (inner_type);
10896 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
10897 /* RTTI TD entries are created while defining the type_info. */
10898 || (TYPE_LANG_SPECIFIC (inner_type)
10899 && TYPE_BEING_DEFINED (inner_type)))
10900 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
10904 /* Called when a class type (given by TYPE) is defined. If there are
10905 any existing VAR_DECLs whose type hsa been completed by this
10906 declaration, update them now. */
10909 complete_vars (tree type)
10911 tree *list = &incomplete_vars;
10913 gcc_assert (CLASS_TYPE_P (type));
10916 if (same_type_p (type, TREE_PURPOSE (*list)))
10918 tree var = TREE_VALUE (*list);
10919 tree type = TREE_TYPE (var);
10920 /* Complete the type of the variable. The VAR_DECL itself
10921 will be laid out in expand_expr. */
10922 complete_type (type);
10923 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
10924 /* Remove this entry from the list. */
10925 *list = TREE_CHAIN (*list);
10928 list = &TREE_CHAIN (*list);
10931 /* Check for pending declarations which may have abstract type. */
10932 complete_type_check_abstract (type);
10935 /* If DECL is of a type which needs a cleanup, build that cleanup
10939 cxx_maybe_build_cleanup (tree decl)
10941 tree type = TREE_TYPE (decl);
10943 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
10945 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
10947 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
10948 && CLASSTYPE_VBASECLASSES (type));
10950 if (TREE_CODE (type) == ARRAY_TYPE)
10954 cxx_mark_addressable (decl);
10955 rval = build_unary_op (ADDR_EXPR, decl, 0);
10958 /* Optimize for space over speed here. */
10959 if (!has_vbases || flag_expensive_optimizations)
10960 flags |= LOOKUP_NONVIRTUAL;
10962 rval = build_delete (TREE_TYPE (rval), rval,
10963 sfk_complete_destructor, flags, 0);
10970 /* When a stmt has been parsed, this function is called. */
10977 /* DECL was originally constructed as a non-static member function,
10978 but turned out to be static. Update it accordingly. */
10981 revert_static_member_fn (tree decl)
10984 tree function = TREE_TYPE (decl);
10985 tree args = TYPE_ARG_TYPES (function);
10987 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
10988 != TYPE_UNQUALIFIED)
10989 error ("static member function %q#D declared with type qualifiers", decl);
10991 args = TREE_CHAIN (args);
10992 tmp = build_function_type (TREE_TYPE (function), args);
10993 tmp = build_qualified_type (tmp, cp_type_quals (function));
10994 tmp = build_exception_variant (tmp,
10995 TYPE_RAISES_EXCEPTIONS (function));
10996 TREE_TYPE (decl) = tmp;
10997 if (DECL_ARGUMENTS (decl))
10998 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
10999 DECL_STATIC_FUNCTION_P (decl) = 1;
11002 /* Initialize the variables used during compilation of a C++
11006 cxx_push_function_context (struct function * f)
11008 struct language_function *p = GGC_CNEW (struct language_function);
11011 /* Whenever we start a new function, we destroy temporaries in the
11013 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11019 if (DECL_SAVED_FUNCTION_DATA (fn))
11021 /* If we already parsed this function, and we're just expanding it
11022 now, restore saved state. */
11023 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11025 /* We don't need the saved data anymore. Unless this is an inline
11026 function; we need the named return value info for
11027 declare_return_variable. */
11028 if (! DECL_INLINE (fn))
11029 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11034 /* Free the language-specific parts of F, now that we've finished
11035 compiling the function. */
11038 cxx_pop_function_context (struct function * f)
11043 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11044 one of the language-independent trees. */
11046 enum cp_tree_node_structure_enum
11047 cp_tree_node_structure (union lang_tree_node * t)
11049 switch (TREE_CODE (&t->generic))
11051 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11052 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11053 case OVERLOAD: return TS_CP_OVERLOAD;
11054 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11055 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11056 case PTRMEM_CST: return TS_CP_PTRMEM;
11057 case BASELINK: return TS_CP_BASELINK;
11058 default: return TS_CP_GENERIC;
11062 /* Build the void_list_node (void_type_node having been created). */
11064 build_void_list_node (void)
11066 tree t = build_tree_list (NULL_TREE, void_type_node);
11071 cp_missing_noreturn_ok_p (tree decl)
11073 /* A missing noreturn is ok for the `main' function. */
11074 return DECL_MAIN_P (decl);
11077 /* Return the COMDAT group into which DECL should be placed. */
11080 cxx_comdat_group (tree decl)
11084 /* Virtual tables, construction virtual tables, and virtual table
11085 tables all go in a single COMDAT group, named after the primary
11087 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11088 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11089 /* For all other DECLs, the COMDAT group is the mangled name of the
11090 declaration itself. */
11093 while (DECL_THUNK_P (decl))
11095 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11096 into the same section as the target function. In that case
11097 we must return target's name. */
11098 tree target = THUNK_TARGET (decl);
11099 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11100 && DECL_SECTION_NAME (target) != NULL
11101 && DECL_ONE_ONLY (target))
11106 name = DECL_ASSEMBLER_NAME (decl);
11109 return IDENTIFIER_POINTER (name);
11112 #include "gt-cp-decl.h"