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 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"
51 #include "diagnostic.h"
55 static tree grokparms (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 grokfndecl (tree, tree, tree, tree, int,
65 enum overload_flags, tree,
66 tree, int, int, int, int, int, int, tree);
67 static tree grokvardecl (tree, tree, RID_BIT_TYPE *, int, int, tree);
68 static void record_unknown_type (tree, const char *);
69 static tree builtin_function_1 (const char *, tree, tree, int,
70 enum built_in_class, const char *,
72 static tree build_library_fn_1 (tree, enum tree_code, tree);
73 static int member_function_or_else (tree, tree, enum overload_flags);
74 static void bad_specifiers (tree, const char *, int, int, int, int,
76 static void check_for_uninitialized_const_var (tree);
77 static hashval_t typename_hash (const void *);
78 static int typename_compare (const void *, const void *);
79 static tree local_variable_p_walkfn (tree *, int *, void *);
80 static tree record_builtin_java_type (const char *, int);
81 static const char *tag_name (enum tag_types code);
82 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
83 static int walk_globals_r (tree, void*);
84 static int walk_vtables_r (tree, void*);
85 static tree make_label_decl (tree, int);
86 static void use_label (tree);
87 static void check_previous_goto_1 (tree, struct cp_binding_level *, tree,
89 static void check_previous_goto (struct named_label_use_list *);
90 static void check_switch_goto (struct cp_binding_level *);
91 static void check_previous_gotos (tree);
92 static void pop_label (tree, tree);
93 static void pop_labels (tree);
94 static void maybe_deduce_size_from_array_init (tree, tree);
95 static void layout_var_decl (tree);
96 static void maybe_commonize_var (tree);
97 static tree check_initializer (tree, tree, int, tree *);
98 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
99 static void save_function_data (tree);
100 static void check_function_type (tree, tree);
101 static void begin_constructor_body (void);
102 static void finish_constructor_body (void);
103 static void begin_destructor_body (void);
104 static void finish_destructor_body (void);
105 static tree create_array_type_for_decl (tree, tree, tree);
106 static tree get_atexit_node (void);
107 static tree get_dso_handle_node (void);
108 static tree start_cleanup_fn (void);
109 static void end_cleanup_fn (void);
110 static tree cp_make_fname_decl (tree, int);
111 static void initialize_predefined_identifiers (void);
112 static tree check_special_function_return_type
113 (special_function_kind, tree, tree);
114 static tree push_cp_library_fn (enum tree_code, tree);
115 static tree build_cp_library_fn (tree, enum tree_code, tree);
116 static void store_parm_decls (tree);
117 static int cp_missing_noreturn_ok_p (tree);
118 static void initialize_local_var (tree, tree);
119 static void expand_static_init (tree, tree);
120 static tree next_initializable_field (tree);
121 static tree reshape_init (tree, tree *);
122 static tree build_typename_type (tree, tree, tree);
124 /* Erroneous argument lists can use this *IFF* they do not modify it. */
125 tree error_mark_list;
127 /* The following symbols are subsumed in the cp_global_trees array, and
128 listed here individually for documentation purposes.
131 tree wchar_decl_node;
133 tree vtable_entry_type;
134 tree delta_type_node;
135 tree __t_desc_type_node;
136 tree ti_desc_type_node;
137 tree bltn_desc_type_node, ptr_desc_type_node;
138 tree ary_desc_type_node, func_desc_type_node, enum_desc_type_node;
139 tree class_desc_type_node, si_class_desc_type_node, vmi_class_desc_type_node;
140 tree ptm_desc_type_node;
141 tree base_desc_type_node;
143 tree class_type_node, record_type_node, union_type_node, enum_type_node;
144 tree unknown_type_node;
146 Array type `vtable_entry_type[]'
149 tree vtbl_ptr_type_node;
156 A FUNCTION_DECL which can call `abort'. Not necessarily the
157 one that the user will declare, but sufficient to be called
158 by routines that want to abort the program.
162 The FUNCTION_DECL for the default `::operator delete'.
164 tree global_delete_fndecl;
167 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
172 tree cp_global_trees[CPTI_MAX];
174 /* Indicates that there is a type value in some namespace, although
175 that is not necessarily in scope at the moment. */
177 tree global_type_node;
179 /* The node that holds the "name" of the global scope. */
180 tree global_scope_name;
182 /* Used only for jumps to as-yet undefined labels, since jumps to
183 defined labels can have their validity checked immediately. */
185 struct named_label_use_list GTY(())
187 struct cp_binding_level *binding_level;
190 location_t o_goto_locus;
191 struct named_label_use_list *next;
194 #define named_label_uses cp_function_chain->x_named_label_uses
196 #define local_names cp_function_chain->x_local_names
198 /* A list of objects which have constructors or destructors
199 which reside in the global scope. The decl is stored in
200 the TREE_VALUE slot and the initializer is stored
201 in the TREE_PURPOSE slot. */
202 tree static_aggregates;
206 /* A node for the integer constants 2, and 3. */
208 tree integer_two_node, integer_three_node;
210 /* Similar, for last_function_parm_tags. */
211 tree last_function_parms;
213 /* A list of all LABEL_DECLs in the function that have names. Here so
214 we can clear out their names' definitions at the end of the
215 function, and so we can check the validity of jumps to these labels. */
217 struct named_label_list GTY(())
219 struct cp_binding_level *binding_level;
224 struct named_label_list *next;
225 unsigned int in_try_scope : 1;
226 unsigned int in_catch_scope : 1;
229 #define named_labels cp_function_chain->x_named_labels
231 /* The number of function bodies which we are currently processing.
232 (Zero if we are at namespace scope, one inside the body of a
233 function, two inside the body of a function in a local class, etc.) */
236 /* States indicating how grokdeclarator() should handle declspecs marked
237 with __attribute__((deprecated)). An object declared as
238 __attribute__((deprecated)) suppresses warnings of uses of other
241 enum deprecated_states {
246 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
248 /* Set by add_implicitly_declared_members() to keep those members from
249 being flagged as deprecated or reported as using deprecated
251 int adding_implicit_members = 0;
253 /* True if a declaration with an `extern' linkage specifier is being
255 bool have_extern_spec;
258 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
259 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
260 time the VAR_DECL was declared, the type was incomplete. */
262 static GTY(()) tree incomplete_vars;
264 /* Returns the kind of template specialization we are currently
265 processing, given that it's declaration contained N_CLASS_SCOPES
266 explicit scope qualifications. */
269 current_tmpl_spec_kind (int n_class_scopes)
271 int n_template_parm_scopes = 0;
272 int seen_specialization_p = 0;
273 int innermost_specialization_p = 0;
274 struct cp_binding_level *b;
276 /* Scan through the template parameter scopes. */
277 for (b = current_binding_level;
278 b->kind == sk_template_parms;
281 /* If we see a specialization scope inside a parameter scope,
282 then something is wrong. That corresponds to a declaration
285 template <class T> template <> ...
287 which is always invalid since [temp.expl.spec] forbids the
288 specialization of a class member template if the enclosing
289 class templates are not explicitly specialized as well. */
290 if (b->explicit_spec_p)
292 if (n_template_parm_scopes == 0)
293 innermost_specialization_p = 1;
295 seen_specialization_p = 1;
297 else if (seen_specialization_p == 1)
298 return tsk_invalid_member_spec;
300 ++n_template_parm_scopes;
303 /* Handle explicit instantiations. */
304 if (processing_explicit_instantiation)
306 if (n_template_parm_scopes != 0)
307 /* We've seen a template parameter list during an explicit
308 instantiation. For example:
310 template <class T> template void f(int);
312 This is erroneous. */
313 return tsk_invalid_expl_inst;
315 return tsk_expl_inst;
318 if (n_template_parm_scopes < n_class_scopes)
319 /* We've not seen enough template headers to match all the
320 specialized classes present. For example:
322 template <class T> void R<T>::S<T>::f(int);
324 This is invalid; there needs to be one set of template
325 parameters for each class. */
326 return tsk_insufficient_parms;
327 else if (n_template_parm_scopes == n_class_scopes)
328 /* We're processing a non-template declaration (even though it may
329 be a member of a template class.) For example:
331 template <class T> void S<T>::f(int);
333 The `class T' maches the `S<T>', leaving no template headers
334 corresponding to the `f'. */
336 else if (n_template_parm_scopes > n_class_scopes + 1)
337 /* We've got too many template headers. For example:
339 template <> template <class T> void f (T);
341 There need to be more enclosing classes. */
342 return tsk_excessive_parms;
344 /* This must be a template. It's of the form:
346 template <class T> template <class U> void S<T>::f(U);
348 This is a specialization if the innermost level was a
349 specialization; otherwise it's just a definition of the
351 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
354 /* Exit the current scope. */
362 /* When a label goes out of scope, check to see if that label was used
363 in a valid manner, and issue any appropriate warnings or errors. */
366 pop_label (tree label, tree old_value)
368 if (!processing_template_decl)
370 if (DECL_INITIAL (label) == NULL_TREE)
374 cp_error_at ("label `%D' used but not defined", label);
375 location.file = input_filename;
377 /* Avoid crashing later. */
378 define_label (location, DECL_NAME (label));
380 else if (warn_unused_label && !TREE_USED (label))
381 cp_warning_at ("label `%D' defined but not used", label);
384 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
387 /* At the end of a function, all labels declared within the function
388 go out of scope. BLOCK is the top-level block for the
392 pop_labels (tree block)
394 struct named_label_list *link;
396 /* Clear out the definitions of all label names, since their scopes
398 for (link = named_labels; link; link = link->next)
400 pop_label (link->label_decl, link->old_value);
401 /* Put the labels into the "variables" of the top-level block,
402 so debugger can see them. */
403 TREE_CHAIN (link->label_decl) = BLOCK_VARS (block);
404 BLOCK_VARS (block) = link->label_decl;
410 /* Exit a binding level.
411 Pop the level off, and restore the state of the identifier-decl mappings
412 that were in effect when this level was entered.
414 If KEEP == 1, this level had explicit declarations, so
415 and create a "block" (a BLOCK node) for the level
416 to record its declarations and subblocks for symbol table output.
418 If FUNCTIONBODY is nonzero, this level is the body of a function,
419 so create a block as if KEEP were set and also clear out all
422 If REVERSE is nonzero, reverse the order of decls before putting
423 them into the BLOCK. */
426 poplevel (int keep, int reverse, int functionbody)
429 /* The chain of decls was accumulated in reverse order.
430 Put it into forward order, just for cleanliness. */
432 int tmp = functionbody;
433 int real_functionbody;
435 tree block = NULL_TREE;
437 int leaving_for_scope;
440 timevar_push (TV_NAME_LOOKUP);
442 my_friendly_assert (current_binding_level->kind != sk_class, 19990916);
444 real_functionbody = (current_binding_level->kind == sk_cleanup
445 ? ((functionbody = 0), tmp) : functionbody);
446 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
448 my_friendly_assert (!current_binding_level->class_shadowed,
451 /* We used to use KEEP == 2 to indicate that the new block should go
452 at the beginning of the list of blocks at this binding level,
453 rather than the end. This hack is no longer used. */
454 my_friendly_assert (keep == 0 || keep == 1, 0);
456 if (current_binding_level->keep)
459 /* Any uses of undefined labels, and any defined labels, now operate
460 under constraints of next binding contour. */
461 if (cfun && !functionbody)
463 struct cp_binding_level *level_chain;
464 level_chain = current_binding_level->level_chain;
467 struct named_label_use_list *uses;
468 struct named_label_list *labels;
469 for (labels = named_labels; labels; labels = labels->next)
470 if (labels->binding_level == current_binding_level)
473 if (current_binding_level->kind == sk_try)
474 labels->in_try_scope = 1;
475 if (current_binding_level->kind == sk_catch)
476 labels->in_catch_scope = 1;
477 for (decl = labels->names_in_scope; decl;
478 decl = TREE_CHAIN (decl))
479 if (decl_jump_unsafe (decl))
480 labels->bad_decls = tree_cons (NULL_TREE, decl,
482 labels->binding_level = level_chain;
483 labels->names_in_scope = level_chain->names;
486 for (uses = named_label_uses; uses; uses = uses->next)
487 if (uses->binding_level == current_binding_level)
489 uses->binding_level = level_chain;
490 uses->names_in_scope = level_chain->names;
495 /* Get the decls in the order they were written.
496 Usually current_binding_level->names is in reverse order.
497 But parameter decls were previously put in forward order. */
500 current_binding_level->names
501 = decls = nreverse (current_binding_level->names);
503 decls = current_binding_level->names;
505 /* Output any nested inline functions within this block
506 if they weren't already output. */
507 for (decl = decls; decl; decl = TREE_CHAIN (decl))
508 if (TREE_CODE (decl) == FUNCTION_DECL
509 && ! TREE_ASM_WRITTEN (decl)
510 && DECL_INITIAL (decl) != NULL_TREE
511 && TREE_ADDRESSABLE (decl)
512 && decl_function_context (decl) == current_function_decl)
514 /* If this decl was copied from a file-scope decl
515 on account of a block-scope extern decl,
516 propagate TREE_ADDRESSABLE to the file-scope decl. */
517 if (DECL_ABSTRACT_ORIGIN (decl) != NULL_TREE)
518 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
521 push_function_context ();
522 output_inline_function (decl);
523 pop_function_context ();
527 /* When not in function-at-a-time mode, expand_end_bindings will
528 warn about unused variables. But, in function-at-a-time mode
529 expand_end_bindings is not passed the list of variables in the
530 current scope, and therefore no warning is emitted. So, we
531 explicitly warn here. */
532 if (!processing_template_decl)
533 warn_about_unused_variables (getdecls ());
535 /* If there were any declarations or structure tags in that level,
536 or if this level is a function body,
537 create a BLOCK to record them for the life of this function. */
539 if (keep == 1 || functionbody)
540 block = make_node (BLOCK);
541 if (block != NULL_TREE)
543 BLOCK_VARS (block) = decls;
544 BLOCK_SUBBLOCKS (block) = subblocks;
547 /* In each subblock, record that this is its superior. */
549 for (link = subblocks; link; link = TREE_CHAIN (link))
550 BLOCK_SUPERCONTEXT (link) = block;
552 /* We still support the old for-scope rules, whereby the variables
553 in a for-init statement were in scope after the for-statement
554 ended. We only use the new rules if flag_new_for_scope is
557 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
559 /* Remove declarations for all the DECLs in this level. */
560 for (link = decls; link; link = TREE_CHAIN (link))
562 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
565 cxx_binding *outer_binding
566 = IDENTIFIER_BINDING (DECL_NAME (link))->previous;
570 ns_binding = IDENTIFIER_NAMESPACE_VALUE (DECL_NAME (link));
572 ns_binding = NULL_TREE;
575 && outer_binding->scope == current_binding_level->level_chain)
576 /* We have something like:
581 and we are leaving the `for' scope. There's no reason to
582 keep the binding of the inner `i' in this case. */
583 pop_binding (DECL_NAME (link), link);
584 else if ((outer_binding
585 && (TREE_CODE (outer_binding->value) == TYPE_DECL))
586 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
587 /* Here, we have something like:
595 We must pop the for-scope binding so we know what's a
596 type and what isn't. */
597 pop_binding (DECL_NAME (link), link);
600 /* Mark this VAR_DECL as dead so that we can tell we left it
601 there only for backward compatibility. */
602 DECL_DEAD_FOR_LOCAL (link) = 1;
604 /* Keep track of what should have happened when we
605 popped the binding. */
606 if (outer_binding && outer_binding->value)
607 DECL_SHADOWED_FOR_VAR (link) = outer_binding->value;
609 /* Add it to the list of dead variables in the next
610 outermost binding to that we can remove these when we
611 leave that binding. */
612 current_binding_level->level_chain->dead_vars_from_for
613 = tree_cons (NULL_TREE, link,
614 current_binding_level->level_chain->
617 /* Although we don't pop the cxx_binding, we do clear
618 its SCOPE since the scope is going away now. */
619 IDENTIFIER_BINDING (DECL_NAME (link))->scope = NULL;
624 /* Remove the binding. */
626 if (TREE_CODE (decl) == TREE_LIST)
627 decl = TREE_VALUE (decl);
629 pop_binding (DECL_NAME (decl), decl);
630 else if (TREE_CODE (decl) == OVERLOAD)
631 pop_binding (DECL_NAME (OVL_FUNCTION (decl)), decl);
637 /* Remove declarations for any `for' variables from inner scopes
638 that we kept around. */
639 for (link = current_binding_level->dead_vars_from_for;
640 link; link = TREE_CHAIN (link))
641 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
643 /* Restore the IDENTIFIER_TYPE_VALUEs. */
644 for (link = current_binding_level->type_shadowed;
645 link; link = TREE_CHAIN (link))
646 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
648 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
649 for (link = current_binding_level->shadowed_labels;
651 link = TREE_CHAIN (link))
652 pop_label (TREE_VALUE (link), TREE_PURPOSE (link));
654 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
655 list if a `using' declaration put them there. The debugging
656 back-ends won't understand OVERLOAD, so we remove them here.
657 Because the BLOCK_VARS are (temporarily) shared with
658 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
659 popped all the bindings. */
664 for (d = &BLOCK_VARS (block); *d; )
666 if (TREE_CODE (*d) == TREE_LIST)
667 *d = TREE_CHAIN (*d);
669 d = &TREE_CHAIN (*d);
673 /* If the level being exited is the top level of a function,
674 check over all the labels. */
677 /* Since this is the top level block of a function, the vars are
678 the function's parameters. Don't leave them in the BLOCK
679 because they are found in the FUNCTION_DECL instead. */
680 BLOCK_VARS (block) = 0;
684 kind = current_binding_level->kind;
688 DECL_INITIAL (current_function_decl) = block;
690 current_binding_level->blocks
691 = chainon (current_binding_level->blocks, block);
693 /* If we did not make a block for the level just exited,
694 any blocks made for inner levels
695 (since they cannot be recorded as subblocks in that level)
696 must be carried forward so they will later become subblocks
697 of something else. */
699 current_binding_level->blocks
700 = chainon (current_binding_level->blocks, subblocks);
702 /* Each and every BLOCK node created here in `poplevel' is important
703 (e.g. for proper debugging information) so if we created one
704 earlier, mark it as "used". */
706 TREE_USED (block) = 1;
708 /* Take care of compiler's internal binding structures. */
709 if (kind == sk_cleanup)
714 = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/1);
717 SCOPE_STMT_BLOCK (TREE_PURPOSE (scope_stmts)) = block;
718 SCOPE_STMT_BLOCK (TREE_VALUE (scope_stmts)) = block;
721 block = poplevel (keep, reverse, functionbody);
724 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
727 /* Delete the node BLOCK from the current binding level.
728 This is used for the block inside a stmt expr ({...})
729 so that the block can be reinserted where appropriate. */
732 delete_block (tree block)
735 if (current_binding_level->blocks == block)
736 current_binding_level->blocks = TREE_CHAIN (block);
737 for (t = current_binding_level->blocks; t;)
739 if (TREE_CHAIN (t) == block)
740 TREE_CHAIN (t) = TREE_CHAIN (block);
744 TREE_CHAIN (block) = NULL_TREE;
745 /* Clear TREE_USED which is always set by poplevel.
746 The flag is set again if insert_block is called. */
747 TREE_USED (block) = 0;
750 /* Insert BLOCK at the end of the list of subblocks of the
751 current binding level. This is used when a BIND_EXPR is expanded,
752 to handle the BLOCK node inside the BIND_EXPR. */
755 insert_block (tree block)
757 TREE_USED (block) = 1;
758 current_binding_level->blocks
759 = chainon (current_binding_level->blocks, block);
762 /* Set the BLOCK node for the innermost scope
763 (the one we are currently in). */
766 set_block (tree block ATTRIBUTE_UNUSED )
768 /* The RTL expansion machinery requires us to provide this callback,
769 but it is not applicable in function-at-a-time mode. */
772 /* Returns nonzero if T is a virtual function table. */
775 vtable_decl_p (tree t, void* data ATTRIBUTE_UNUSED )
777 return (TREE_CODE (t) == VAR_DECL && DECL_VIRTUAL_P (t));
780 /* Returns nonzero if T is a TYPE_DECL for a type with virtual
784 vtype_decl_p (tree t, void *data ATTRIBUTE_UNUSED )
786 return (TREE_CODE (t) == TYPE_DECL
787 && TREE_CODE (TREE_TYPE (t)) == RECORD_TYPE
788 && TYPE_POLYMORPHIC_P (TREE_TYPE (t)));
791 struct walk_globals_data {
797 /* Walk the vtable declarations in NAMESPACE. Whenever one is found
798 for which P returns nonzero, call F with its address. If any call
799 to F returns a nonzero value, return a nonzero value. */
802 walk_vtables_r (tree namespace, void* data)
804 struct walk_globals_data* wgd = (struct walk_globals_data *) data;
805 walk_globals_fn f = wgd->f;
807 tree decl = NAMESPACE_LEVEL (namespace)->vtables;
810 for (; decl ; decl = TREE_CHAIN (decl))
811 result |= (*f) (&decl, d);
816 /* Walk the vtable declarations. Whenever one is found for which P
817 returns nonzero, call F with its address. If any call to F
818 returns a nonzero value, return a nonzero value. */
820 walk_vtables (walk_globals_pred p, walk_globals_fn f, void *data)
822 struct walk_globals_data wgd;
827 return walk_namespaces (walk_vtables_r, &wgd);
830 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
831 itself, calling F for each. The DATA is passed to F as well. */
834 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
837 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
839 result |= (*f) (namespace, data);
841 for (; current; current = TREE_CHAIN (current))
842 result |= walk_namespaces_r (current, f, data);
847 /* Walk all the namespaces, calling F for each. The DATA is passed to
851 walk_namespaces (walk_namespaces_fn f, void* data)
853 return walk_namespaces_r (global_namespace, f, data);
856 /* Walk the global declarations in NAMESPACE. Whenever one is found
857 for which P returns nonzero, call F with its address. If any call
858 to F returns a nonzero value, return a nonzero value. */
861 walk_globals_r (tree namespace, void* data)
863 struct walk_globals_data* wgd = (struct walk_globals_data *) data;
864 walk_globals_pred p = wgd->p;
865 walk_globals_fn f = wgd->f;
870 t = &NAMESPACE_LEVEL (namespace)->names;
877 result |= (*f) (t, d);
879 /* If F changed *T, then *T still points at the next item to
882 t = &TREE_CHAIN (*t);
888 /* Walk the global declarations. Whenever one is found for which P
889 returns true, call F with its address. If any call to F
890 returns true, return true. */
893 walk_globals (walk_globals_pred p, walk_globals_fn f, void *data)
895 struct walk_globals_data wgd;
900 return walk_namespaces (walk_globals_r, &wgd);
903 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
904 DATA is non-NULL, this is the last time we will call
905 wrapup_global_declarations for this NAMESPACE. */
908 wrapup_globals_for_namespace (tree namespace, void* data)
910 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
911 varray_type statics = level->static_decls;
912 tree *vec = &VARRAY_TREE (statics, 0);
913 int len = VARRAY_ACTIVE_SIZE (statics);
914 int last_time = (data != 0);
918 check_global_declarations (vec, len);
922 /* Write out any globals that need to be output. */
923 return wrapup_global_declarations (vec, len);
927 /* In C++, you don't have to write `struct S' to refer to `S'; you
928 can just use `S'. We accomplish this by creating a TYPE_DECL as
929 if the user had written `typedef struct S S'. Create and return
930 the TYPE_DECL for TYPE. */
933 create_implicit_typedef (tree name, tree type)
937 decl = build_decl (TYPE_DECL, name, type);
938 DECL_ARTIFICIAL (decl) = 1;
939 /* There are other implicit type declarations, like the one *within*
940 a class that allows you to write `S::S'. We must distinguish
942 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
943 TYPE_NAME (type) = decl;
948 /* Remember a local name for name-mangling purposes. */
951 push_local_name (tree decl)
956 timevar_push (TV_NAME_LOOKUP);
958 VARRAY_TREE_INIT (local_names, 8, "local_names");
960 name = DECL_NAME (decl);
962 nelts = VARRAY_ACTIVE_SIZE (local_names);
963 for (i = 0; i < nelts; i++)
965 t = VARRAY_TREE (local_names, i);
966 if (DECL_NAME (t) == name)
968 if (!DECL_LANG_SPECIFIC (decl))
969 retrofit_lang_decl (decl);
970 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
971 if (DECL_LANG_SPECIFIC (t))
972 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
974 DECL_DISCRIMINATOR (decl) = 1;
976 VARRAY_TREE (local_names, i) = decl;
977 timevar_pop (TV_NAME_LOOKUP);
982 VARRAY_PUSH_TREE (local_names, decl);
983 timevar_pop (TV_NAME_LOOKUP);
986 /* Subroutine of duplicate_decls: return truthvalue of whether
987 or not types of these decls match.
989 For C++, we must compare the parameter list so that `int' can match
990 `int&' in a parameter position, but `int&' is not confused with
994 decls_match (tree newdecl, tree olddecl)
998 if (newdecl == olddecl)
1001 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
1002 /* If the two DECLs are not even the same kind of thing, we're not
1003 interested in their types. */
1006 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1008 tree f1 = TREE_TYPE (newdecl);
1009 tree f2 = TREE_TYPE (olddecl);
1010 tree p1 = TYPE_ARG_TYPES (f1);
1011 tree p2 = TYPE_ARG_TYPES (f2);
1013 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1014 && ! (DECL_EXTERN_C_P (newdecl)
1015 && DECL_EXTERN_C_P (olddecl)))
1018 if (TREE_CODE (f1) != TREE_CODE (f2))
1021 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
1023 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
1024 && (DECL_BUILT_IN (olddecl)
1025 #ifndef NO_IMPLICIT_EXTERN_C
1026 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
1027 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1031 types_match = self_promoting_args_p (p1);
1032 if (p1 == void_list_node)
1033 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1035 #ifndef NO_IMPLICIT_EXTERN_C
1036 else if (p1 == NULL_TREE
1037 && (DECL_EXTERN_C_P (olddecl)
1038 && DECL_IN_SYSTEM_HEADER (olddecl)
1039 && !DECL_CLASS_SCOPE_P (olddecl))
1040 && (DECL_EXTERN_C_P (newdecl)
1041 && DECL_IN_SYSTEM_HEADER (newdecl)
1042 && !DECL_CLASS_SCOPE_P (newdecl)))
1044 types_match = self_promoting_args_p (p2);
1045 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1049 types_match = compparms (p1, p2);
1054 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1056 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1057 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1060 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1061 DECL_TEMPLATE_PARMS (olddecl)))
1064 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1065 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1066 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1068 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1069 DECL_TEMPLATE_RESULT (newdecl));
1073 if (TREE_TYPE (newdecl) == error_mark_node)
1074 types_match = TREE_TYPE (olddecl) == error_mark_node;
1075 else if (TREE_TYPE (olddecl) == NULL_TREE)
1076 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1077 else if (TREE_TYPE (newdecl) == NULL_TREE)
1080 types_match = comptypes (TREE_TYPE (newdecl),
1081 TREE_TYPE (olddecl),
1082 COMPARE_REDECLARATION);
1088 /* If NEWDECL is `static' and an `extern' was seen previously,
1089 warn about it. OLDDECL is the previous declaration.
1091 Note that this does not apply to the C++ case of declaring
1092 a variable `extern const' and then later `const'.
1094 Don't complain about built-in functions, since they are beyond
1095 the user's control. */
1098 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1100 static const char *const explicit_extern_static_warning
1101 = "`%D' was declared `extern' and later `static'";
1102 static const char *const implicit_extern_static_warning
1103 = "`%D' was declared implicitly `extern' and later `static'";
1107 if (TREE_CODE (newdecl) == TYPE_DECL
1108 || TREE_CODE (newdecl) == TEMPLATE_DECL
1109 || TREE_CODE (newdecl) == CONST_DECL
1110 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1113 /* Don't get confused by static member functions; that's a different
1115 if (TREE_CODE (newdecl) == FUNCTION_DECL
1116 && DECL_STATIC_FUNCTION_P (newdecl))
1119 /* If the old declaration was `static', or the new one isn't, then
1120 then everything is OK. */
1121 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1124 /* It's OK to declare a builtin function as `static'. */
1125 if (TREE_CODE (olddecl) == FUNCTION_DECL
1126 && DECL_ARTIFICIAL (olddecl))
1129 name = DECL_ASSEMBLER_NAME (newdecl);
1130 pedwarn (IDENTIFIER_IMPLICIT_DECL (name)
1131 ? implicit_extern_static_warning
1132 : explicit_extern_static_warning, newdecl);
1133 cp_pedwarn_at ("previous declaration of `%D'", olddecl);
1136 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1137 If the redeclaration is invalid, a diagnostic is issued, and the
1138 error_mark_node is returned. Otherwise, OLDDECL is returned.
1140 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1144 duplicate_decls (tree newdecl, tree olddecl)
1146 unsigned olddecl_uid = DECL_UID (olddecl);
1147 int olddecl_friend = 0, types_match = 0;
1148 int new_defines_function = 0;
1150 if (newdecl == olddecl)
1153 types_match = decls_match (newdecl, olddecl);
1155 /* If either the type of the new decl or the type of the old decl is an
1156 error_mark_node, then that implies that we have already issued an
1157 error (earlier) for some bogus type specification, and in that case,
1158 it is rather pointless to harass the user with yet more error message
1159 about the same declaration, so just pretend the types match here. */
1160 if (TREE_TYPE (newdecl) == error_mark_node
1161 || TREE_TYPE (olddecl) == error_mark_node)
1164 if (DECL_P (olddecl)
1165 && TREE_CODE (newdecl) == FUNCTION_DECL
1166 && TREE_CODE (olddecl) == FUNCTION_DECL
1167 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1169 if (DECL_DECLARED_INLINE_P (newdecl)
1170 && DECL_UNINLINABLE (newdecl)
1171 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1172 /* Already warned elsewhere. */;
1173 else if (DECL_DECLARED_INLINE_P (olddecl)
1174 && DECL_UNINLINABLE (olddecl)
1175 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1176 /* Already warned. */;
1177 else if (DECL_DECLARED_INLINE_P (newdecl)
1178 && DECL_UNINLINABLE (olddecl)
1179 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1181 warning ("%Jfunction '%D' redeclared as inline", newdecl, newdecl);
1182 warning ("%Jprevious declaration of '%D' with attribute noinline",
1185 else if (DECL_DECLARED_INLINE_P (olddecl)
1186 && DECL_UNINLINABLE (newdecl)
1187 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1189 warning ("%Jfunction '%D' redeclared with attribute noinline",
1191 warning ("%Jprevious declaration of '%D' was inline",
1196 /* Check for redeclaration and other discrepancies. */
1197 if (TREE_CODE (olddecl) == FUNCTION_DECL
1198 && DECL_ARTIFICIAL (olddecl))
1200 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1202 /* Avoid warnings redeclaring anticipated built-ins. */
1203 if (DECL_ANTICIPATED (olddecl))
1206 /* If you declare a built-in or predefined function name as static,
1207 the old definition is overridden, but optionally warn this was a
1208 bad choice of name. */
1209 if (! TREE_PUBLIC (newdecl))
1212 warning ("shadowing %s function `%#D'",
1213 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1215 /* Discard the old built-in function. */
1218 /* If the built-in is not ansi, then programs can override
1219 it even globally without an error. */
1220 else if (! DECL_BUILT_IN (olddecl))
1221 warning ("library function `%#D' redeclared as non-function `%#D'",
1225 error ("declaration of `%#D'", newdecl);
1226 error ("conflicts with built-in declaration `%#D'",
1231 else if (!types_match)
1233 /* Avoid warnings redeclaring anticipated built-ins. */
1234 if (DECL_ANTICIPATED (olddecl))
1235 ; /* Do nothing yet. */
1236 else if ((DECL_EXTERN_C_P (newdecl)
1237 && DECL_EXTERN_C_P (olddecl))
1238 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1239 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1241 /* A near match; override the builtin. */
1243 if (TREE_PUBLIC (newdecl))
1245 warning ("new declaration `%#D'", newdecl);
1246 warning ("ambiguates built-in declaration `%#D'",
1249 else if (warn_shadow)
1250 warning ("shadowing %s function `%#D'",
1251 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1255 /* Discard the old built-in function. */
1258 /* Replace the old RTL to avoid problems with inlining. */
1259 SET_DECL_RTL (olddecl, DECL_RTL (newdecl));
1261 /* Even if the types match, prefer the new declarations type
1262 for anticipated built-ins, for exception lists, etc... */
1263 else if (DECL_ANTICIPATED (olddecl))
1264 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1266 /* Whether or not the builtin can throw exceptions has no
1267 bearing on this declarator. */
1268 TREE_NOTHROW (olddecl) = 0;
1270 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1272 /* If a builtin function is redeclared as `static', merge
1273 the declarations, but make the original one static. */
1274 DECL_THIS_STATIC (olddecl) = 1;
1275 TREE_PUBLIC (olddecl) = 0;
1277 /* Make the old declaration consistent with the new one so
1278 that all remnants of the builtin-ness of this function
1279 will be banished. */
1280 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1281 SET_DECL_RTL (olddecl, DECL_RTL (newdecl));
1284 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1286 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1287 && TREE_CODE (newdecl) != TYPE_DECL
1288 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1289 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1290 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1291 && TREE_CODE (olddecl) != TYPE_DECL
1292 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1293 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1296 /* We do nothing special here, because C++ does such nasty
1297 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1298 get shadowed, and know that if we need to find a TYPE_DECL
1299 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1300 slot of the identifier. */
1304 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1305 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1306 || (TREE_CODE (olddecl) == FUNCTION_DECL
1307 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1310 error ("`%#D' redeclared as different kind of symbol", newdecl);
1311 if (TREE_CODE (olddecl) == TREE_LIST)
1312 olddecl = TREE_VALUE (olddecl);
1313 cp_error_at ("previous declaration of `%#D'", olddecl);
1315 /* New decl is completely inconsistent with the old one =>
1316 tell caller to replace the old one. */
1320 else if (!types_match)
1322 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1323 /* These are certainly not duplicate declarations; they're
1324 from different scopes. */
1327 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1329 /* The name of a class template may not be declared to refer to
1330 any other template, class, function, object, namespace, value,
1331 or type in the same scope. */
1332 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1333 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1335 error ("declaration of template `%#D'", newdecl);
1336 cp_error_at ("conflicts with previous declaration `%#D'",
1339 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1340 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1341 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1342 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1343 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1344 DECL_TEMPLATE_PARMS (olddecl))
1345 /* Template functions can be disambiguated by
1347 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1348 TREE_TYPE (TREE_TYPE (olddecl))))
1350 error ("new declaration `%#D'", newdecl);
1351 cp_error_at ("ambiguates old declaration `%#D'", olddecl);
1355 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1357 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1359 error ("declaration of C function `%#D' conflicts with",
1361 cp_error_at ("previous declaration `%#D' here", olddecl);
1363 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1364 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1366 error ("new declaration `%#D'", newdecl);
1367 cp_error_at ("ambiguates old declaration `%#D'", olddecl);
1373 /* Already complained about this, so don't do so again. */
1374 else if (current_class_type == NULL_TREE
1375 || IDENTIFIER_ERROR_LOCUS (DECL_ASSEMBLER_NAME (newdecl)) != current_class_type)
1377 error ("conflicting declaration '%#D'", newdecl);
1378 cp_error_at ("'%D' has a previous declaration as `%#D'",
1383 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1384 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1385 && (!DECL_TEMPLATE_INFO (newdecl)
1386 || (DECL_TI_TEMPLATE (newdecl)
1387 != DECL_TI_TEMPLATE (olddecl))))
1388 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1389 && (!DECL_TEMPLATE_INFO (olddecl)
1390 || (DECL_TI_TEMPLATE (olddecl)
1391 != DECL_TI_TEMPLATE (newdecl))))))
1392 /* It's OK to have a template specialization and a non-template
1393 with the same type, or to have specializations of two
1394 different templates with the same type. Note that if one is a
1395 specialization, and the other is an instantiation of the same
1396 template, that we do not exit at this point. That situation
1397 can occur if we instantiate a template class, and then
1398 specialize one of its methods. This situation is valid, but
1399 the declarations must be merged in the usual way. */
1401 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1402 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1403 && !DECL_USE_TEMPLATE (newdecl))
1404 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1405 && !DECL_USE_TEMPLATE (olddecl))))
1406 /* One of the declarations is a template instantiation, and the
1407 other is not a template at all. That's OK. */
1409 else if (TREE_CODE (newdecl) == NAMESPACE_DECL
1410 && DECL_NAMESPACE_ALIAS (newdecl)
1411 && DECL_NAMESPACE_ALIAS (newdecl) == DECL_NAMESPACE_ALIAS (olddecl))
1412 /* In [namespace.alias] we have:
1414 In a declarative region, a namespace-alias-definition can be
1415 used to redefine a namespace-alias declared in that declarative
1416 region to refer only to the namespace to which it already
1419 Therefore, if we encounter a second alias directive for the same
1420 alias, we can just ignore the second directive. */
1424 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1427 error (errmsg, newdecl);
1428 if (DECL_NAME (olddecl) != NULL_TREE)
1429 cp_error_at ((DECL_INITIAL (olddecl)
1430 && namespace_bindings_p ())
1431 ? "`%#D' previously defined here"
1432 : "`%#D' previously declared here", olddecl);
1433 return error_mark_node;
1435 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1436 && DECL_INITIAL (olddecl) != NULL_TREE
1437 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1438 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1440 /* Prototype decl follows defn w/o prototype. */
1441 cp_warning_at ("prototype for `%#D'", newdecl);
1442 warning ("%Jfollows non-prototype definition here", olddecl);
1444 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1445 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1447 /* extern "C" int foo ();
1448 int foo () { bar (); }
1450 if (current_lang_depth () == 0)
1451 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1454 cp_error_at ("previous declaration of `%#D' with %L linkage",
1455 olddecl, DECL_LANGUAGE (olddecl));
1456 error ("conflicts with new declaration with %L linkage",
1457 DECL_LANGUAGE (newdecl));
1461 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1463 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1465 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1466 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1469 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1470 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1472 for (; t1 && t1 != void_list_node;
1473 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1474 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1476 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1479 pedwarn ("default argument given for parameter %d of `%#D'",
1481 cp_pedwarn_at ("after previous specification in `%#D'",
1486 error ("default argument given for parameter %d of `%#D'",
1488 cp_error_at ("after previous specification in `%#D'",
1493 if (DECL_DECLARED_INLINE_P (newdecl)
1494 && ! DECL_DECLARED_INLINE_P (olddecl)
1495 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1497 warning ("`%#D' was used before it was declared inline", newdecl);
1498 warning ("%Jprevious non-inline declaration here", olddecl);
1503 /* Do not merge an implicit typedef with an explicit one. In:
1507 typedef class A A __attribute__ ((foo));
1509 the attribute should apply only to the typedef. */
1510 if (TREE_CODE (olddecl) == TYPE_DECL
1511 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1512 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1515 /* If new decl is `static' and an `extern' was seen previously,
1517 warn_extern_redeclared_static (newdecl, olddecl);
1519 /* We have committed to returning 1 at this point. */
1520 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1522 /* Now that functions must hold information normally held
1523 by field decls, there is extra work to do so that
1524 declaration information does not get destroyed during
1526 if (DECL_VINDEX (olddecl))
1527 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1528 if (DECL_CONTEXT (olddecl))
1529 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1530 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1531 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1532 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1533 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1534 DECL_NEEDS_FINAL_OVERRIDER_P (newdecl) |= DECL_NEEDS_FINAL_OVERRIDER_P (olddecl);
1535 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1536 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1537 SET_OVERLOADED_OPERATOR_CODE
1538 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1539 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1541 /* Optionally warn about more than one declaration for the same
1542 name, but don't warn about a function declaration followed by a
1544 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1545 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1546 /* Don't warn about extern decl followed by definition. */
1547 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1548 /* Don't warn about friends, let add_friend take care of it. */
1549 && ! (DECL_FRIEND_P (newdecl) || DECL_FRIEND_P (olddecl)))
1551 warning ("redundant redeclaration of `%D' in same scope", newdecl);
1552 cp_warning_at ("previous declaration of `%D'", olddecl);
1556 /* Deal with C++: must preserve virtual function table size. */
1557 if (TREE_CODE (olddecl) == TYPE_DECL)
1559 tree newtype = TREE_TYPE (newdecl);
1560 tree oldtype = TREE_TYPE (olddecl);
1562 if (newtype != error_mark_node && oldtype != error_mark_node
1563 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1564 CLASSTYPE_FRIEND_CLASSES (newtype)
1565 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1567 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1570 /* Copy all the DECL_... slots specified in the new decl
1571 except for any that we copy here from the old type. */
1572 DECL_ATTRIBUTES (newdecl)
1573 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1575 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1577 TREE_TYPE (olddecl) = TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl));
1578 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1579 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1580 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1582 /* If the new declaration is a definition, update the file and
1583 line information on the declaration. */
1584 if (DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)) == NULL_TREE
1585 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl)) != NULL_TREE)
1587 DECL_SOURCE_LOCATION (olddecl)
1588 = DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (olddecl))
1589 = DECL_SOURCE_LOCATION (newdecl);
1597 /* Automatically handles default parameters. */
1598 tree oldtype = TREE_TYPE (olddecl);
1601 /* Merge the data types specified in the two decls. */
1602 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1604 /* If merge_types produces a non-typedef type, just use the old type. */
1605 if (TREE_CODE (newdecl) == TYPE_DECL
1606 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1609 if (TREE_CODE (newdecl) == VAR_DECL)
1611 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1612 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1613 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1614 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1617 /* Do this after calling `merge_types' so that default
1618 parameters don't confuse us. */
1619 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1620 && (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl))
1621 != TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl))))
1623 TREE_TYPE (newdecl) = build_exception_variant (newtype,
1624 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)));
1625 TREE_TYPE (olddecl) = build_exception_variant (newtype,
1626 TYPE_RAISES_EXCEPTIONS (oldtype));
1628 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (olddecl))
1629 && DECL_SOURCE_LINE (olddecl) != 0
1631 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)),
1632 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl)), 1))
1634 error ("declaration of `%F' throws different exceptions",
1636 cp_error_at ("than previous declaration `%F'", olddecl);
1639 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1641 /* Lay the type out, unless already done. */
1642 if (! same_type_p (newtype, oldtype)
1643 && TREE_TYPE (newdecl) != error_mark_node
1644 && !(processing_template_decl && uses_template_parms (newdecl)))
1645 layout_type (TREE_TYPE (newdecl));
1647 if ((TREE_CODE (newdecl) == VAR_DECL
1648 || TREE_CODE (newdecl) == PARM_DECL
1649 || TREE_CODE (newdecl) == RESULT_DECL
1650 || TREE_CODE (newdecl) == FIELD_DECL
1651 || TREE_CODE (newdecl) == TYPE_DECL)
1652 && !(processing_template_decl && uses_template_parms (newdecl)))
1653 layout_decl (newdecl, 0);
1655 /* Merge the type qualifiers. */
1656 if (TREE_READONLY (newdecl))
1657 TREE_READONLY (olddecl) = 1;
1658 if (TREE_THIS_VOLATILE (newdecl))
1659 TREE_THIS_VOLATILE (olddecl) = 1;
1661 /* Merge the initialization information. */
1662 if (DECL_INITIAL (newdecl) == NULL_TREE
1663 && DECL_INITIAL (olddecl) != NULL_TREE)
1665 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1666 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1667 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1668 && DECL_LANG_SPECIFIC (newdecl)
1669 && DECL_LANG_SPECIFIC (olddecl))
1671 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1672 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1676 /* Merge the section attribute.
1677 We want to issue an error if the sections conflict but that must be
1678 done later in decl_attributes since we are called before attributes
1680 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1681 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1683 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1685 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1686 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1687 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1688 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1689 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1690 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1691 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1692 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1693 /* Keep the old RTL. */
1694 COPY_DECL_RTL (olddecl, newdecl);
1696 else if (TREE_CODE (newdecl) == VAR_DECL
1697 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1699 /* Keep the old RTL. We cannot keep the old RTL if the old
1700 declaration was for an incomplete object and the new
1701 declaration is not since many attributes of the RTL will
1703 COPY_DECL_RTL (olddecl, newdecl);
1706 /* If cannot merge, then use the new type and qualifiers,
1707 and don't preserve the old rtl. */
1710 /* Clean out any memory we had of the old declaration. */
1711 tree oldstatic = value_member (olddecl, static_aggregates);
1713 TREE_VALUE (oldstatic) = error_mark_node;
1715 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1716 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1717 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1718 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1721 /* Merge the storage class information. */
1722 merge_weak (newdecl, olddecl);
1724 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1725 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1726 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1727 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1728 if (! DECL_EXTERNAL (olddecl))
1729 DECL_EXTERNAL (newdecl) = 0;
1731 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1733 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1734 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1735 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1736 DECL_TEMPLATE_INSTANTIATED (newdecl)
1737 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1738 /* Don't really know how much of the language-specific
1739 values we should copy from old to new. */
1740 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1741 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1742 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1743 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1744 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1745 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1746 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1747 olddecl_friend = DECL_FRIEND_P (olddecl);
1749 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1750 if (TREE_CODE (newdecl) == FUNCTION_DECL
1751 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1753 DECL_BEFRIENDING_CLASSES (newdecl)
1754 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1755 DECL_BEFRIENDING_CLASSES (olddecl));
1756 /* DECL_THUNKS is only valid for virtual functions,
1757 otherwise it is a DECL_FRIEND_CONTEXT. */
1758 if (DECL_VIRTUAL_P (newdecl))
1759 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1763 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1765 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1766 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1768 /* If newdecl is not a specialization, then it is not a
1769 template-related function at all. And that means that we
1770 should have exited above, returning 0. */
1771 my_friendly_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl),
1774 if (TREE_USED (olddecl))
1775 /* From [temp.expl.spec]:
1777 If a template, a member template or the member of a class
1778 template is explicitly specialized then that
1779 specialization shall be declared before the first use of
1780 that specialization that would cause an implicit
1781 instantiation to take place, in every translation unit in
1782 which such a use occurs. */
1783 error ("explicit specialization of %D after first use",
1786 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1788 /* [temp.expl.spec/14] We don't inline explicit specialization
1789 just because the primary template says so. */
1793 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1794 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1796 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1798 /* If either decl says `inline', this fn is inline, unless
1799 its definition was passed already. */
1800 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1801 DECL_INLINE (olddecl) = 1;
1802 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1804 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1805 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1808 /* Preserve abstractness on cloned [cd]tors. */
1809 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1813 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1814 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1815 SET_DECL_RTL (olddecl, DECL_RTL (newdecl));
1817 if (! types_match || new_defines_function)
1819 /* These need to be copied so that the names are available.
1820 Note that if the types do match, we'll preserve inline
1821 info and other bits, but if not, we won't. */
1822 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1823 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1825 if (new_defines_function)
1826 /* If defining a function declared with other language
1827 linkage, use the previously declared language linkage. */
1828 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1829 else if (types_match)
1831 /* If redeclaring a builtin function, and not a definition,
1832 it stays built in. */
1833 if (DECL_BUILT_IN (olddecl))
1835 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1836 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1837 /* If we're keeping the built-in definition, keep the rtl,
1838 regardless of declaration matches. */
1839 SET_DECL_RTL (newdecl, DECL_RTL (olddecl));
1842 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1844 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1845 /* Don't clear out the arguments if we're redefining a function. */
1846 if (DECL_ARGUMENTS (olddecl))
1847 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1850 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1851 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1853 /* Now preserve various other info from the definition. */
1854 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1855 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1856 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1857 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1859 /* If either declaration has a nondefault visibility, use it. */
1860 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1862 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1863 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1865 warning ("%J'%D': visibility attribute ignored because it",
1867 warning ("%Jconflicts with previous declaration here", olddecl);
1869 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1872 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1876 function_size = sizeof (struct tree_decl);
1878 memcpy ((char *) olddecl + sizeof (struct tree_common),
1879 (char *) newdecl + sizeof (struct tree_common),
1880 function_size - sizeof (struct tree_common));
1882 if (DECL_TEMPLATE_INSTANTIATION (newdecl))
1883 /* If newdecl is a template instantiation, it is possible that
1884 the following sequence of events has occurred:
1886 o A friend function was declared in a class template. The
1887 class template was instantiated.
1889 o The instantiation of the friend declaration was
1890 recorded on the instantiation list, and is newdecl.
1892 o Later, however, instantiate_class_template called pushdecl
1893 on the newdecl to perform name injection. But, pushdecl in
1894 turn called duplicate_decls when it discovered that another
1895 declaration of a global function with the same name already
1898 o Here, in duplicate_decls, we decided to clobber newdecl.
1900 If we're going to do that, we'd better make sure that
1901 olddecl, and not newdecl, is on the list of
1902 instantiations so that if we try to do the instantiation
1903 again we won't get the clobbered declaration. */
1904 reregister_specialization (newdecl,
1905 DECL_TI_TEMPLATE (newdecl),
1910 memcpy ((char *) olddecl + sizeof (struct tree_common),
1911 (char *) newdecl + sizeof (struct tree_common),
1912 sizeof (struct tree_decl) - sizeof (struct tree_common)
1913 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1916 DECL_UID (olddecl) = olddecl_uid;
1918 DECL_FRIEND_P (olddecl) = 1;
1920 /* NEWDECL contains the merged attribute lists.
1921 Update OLDDECL to be the same. */
1922 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1924 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1925 so that encode_section_info has a chance to look at the new decl
1926 flags and attributes. */
1927 if (DECL_RTL_SET_P (olddecl)
1928 && (TREE_CODE (olddecl) == FUNCTION_DECL
1929 || (TREE_CODE (olddecl) == VAR_DECL
1930 && TREE_STATIC (olddecl))))
1931 make_decl_rtl (olddecl, NULL);
1936 /* Generate an implicit declaration for identifier FUNCTIONID
1937 as a function of type int (). Print a warning if appropriate. */
1940 implicitly_declare (tree functionid)
1944 /* We used to reuse an old implicit decl here,
1945 but this loses with inline functions because it can clobber
1946 the saved decl chains. */
1947 decl = build_lang_decl (FUNCTION_DECL, functionid, default_function_type);
1949 DECL_EXTERNAL (decl) = 1;
1950 TREE_PUBLIC (decl) = 1;
1952 /* ISO standard says implicit declarations are in the innermost block.
1953 So we record the decl in the standard fashion. */
1955 rest_of_decl_compilation (decl, NULL, 0, 0);
1958 /* Only one warning per identifier. */
1959 && IDENTIFIER_IMPLICIT_DECL (functionid) == NULL_TREE)
1961 pedwarn ("implicit declaration of function `%#D'", decl);
1964 SET_IDENTIFIER_IMPLICIT_DECL (functionid, decl);
1969 /* Return zero if the declaration NEWDECL is valid
1970 when the declaration OLDDECL (assumed to be for the same name)
1971 has already been seen.
1972 Otherwise return an error message format string with a %s
1973 where the identifier should go. */
1976 redeclaration_error_message (tree newdecl, tree olddecl)
1978 if (TREE_CODE (newdecl) == TYPE_DECL)
1980 /* Because C++ can put things into name space for free,
1981 constructs like "typedef struct foo { ... } foo"
1982 would look like an erroneous redeclaration. */
1983 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1986 return "redefinition of `%#D'";
1988 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1990 /* If this is a pure function, its olddecl will actually be
1991 the original initialization to `0' (which we force to call
1992 abort()). Don't complain about redefinition in this case. */
1993 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl))
1996 /* If both functions come from different namespaces, this is not
1997 a redeclaration - this is a conflict with a used function. */
1998 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1999 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl))
2000 return "`%D' conflicts with used function";
2002 /* We'll complain about linkage mismatches in
2003 warn_extern_redeclared_static. */
2005 /* Defining the same name twice is no good. */
2006 if (DECL_INITIAL (olddecl) != NULL_TREE
2007 && DECL_INITIAL (newdecl) != NULL_TREE)
2009 if (DECL_NAME (olddecl) == NULL_TREE)
2010 return "`%#D' not declared in class";
2012 return "redefinition of `%#D'";
2016 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2018 if ((TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
2019 && (DECL_TEMPLATE_RESULT (newdecl)
2020 != DECL_TEMPLATE_RESULT (olddecl))
2021 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl))
2022 && DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)))
2023 || (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL
2024 && COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2025 && COMPLETE_TYPE_P (TREE_TYPE (olddecl))))
2026 return "redefinition of `%#D'";
2029 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2031 /* Objects declared at top level: */
2032 /* If at least one is a reference, it's ok. */
2033 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2035 /* Reject two definitions. */
2036 return "redefinition of `%#D'";
2040 /* Objects declared with block scope: */
2041 /* Reject two definitions, and reject a definition
2042 together with an external reference. */
2043 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2044 return "redeclaration of `%#D'";
2049 /* Create a new label, named ID. */
2052 make_label_decl (tree id, int local_p)
2056 decl = build_decl (LABEL_DECL, id, void_type_node);
2058 DECL_CONTEXT (decl) = current_function_decl;
2059 DECL_MODE (decl) = VOIDmode;
2060 C_DECLARED_LABEL_FLAG (decl) = local_p;
2062 /* Say where one reference is to the label, for the sake of the
2063 error if it is not defined. */
2064 DECL_SOURCE_LOCATION (decl) = input_location;
2066 /* Record the fact that this identifier is bound to this label. */
2067 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2072 /* Record this label on the list of used labels so that we can check
2073 at the end of the function to see whether or not the label was
2074 actually defined, and so we can check when the label is defined whether
2075 this use is valid. */
2078 use_label (tree decl)
2080 if (named_label_uses == NULL
2081 || named_label_uses->names_in_scope != current_binding_level->names
2082 || named_label_uses->label_decl != decl)
2084 struct named_label_use_list *new_ent;
2085 new_ent = ggc_alloc (sizeof (struct named_label_use_list));
2086 new_ent->label_decl = decl;
2087 new_ent->names_in_scope = current_binding_level->names;
2088 new_ent->binding_level = current_binding_level;
2089 new_ent->o_goto_locus = input_location;
2090 new_ent->next = named_label_uses;
2091 named_label_uses = new_ent;
2095 /* Look for a label named ID in the current function. If one cannot
2096 be found, create one. (We keep track of used, but undefined,
2097 labels, and complain about them at the end of a function.) */
2100 lookup_label (tree id)
2103 struct named_label_list *ent;
2105 timevar_push (TV_NAME_LOOKUP);
2106 /* You can't use labels at global scope. */
2107 if (current_function_decl == NULL_TREE)
2109 error ("label `%s' referenced outside of any function",
2110 IDENTIFIER_POINTER (id));
2111 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2114 /* See if we've already got this label. */
2115 decl = IDENTIFIER_LABEL_VALUE (id);
2116 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2117 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2119 /* Record this label on the list of labels used in this function.
2120 We do this before calling make_label_decl so that we get the
2121 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2122 ent = ggc_alloc_cleared (sizeof (struct named_label_list));
2123 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2124 ent->next = named_labels;
2127 /* We need a new label. */
2128 decl = make_label_decl (id, /*local_p=*/0);
2130 /* Now fill in the information we didn't have before. */
2131 ent->label_decl = decl;
2133 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2136 /* Declare a local label named ID. */
2139 declare_local_label (tree id)
2143 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2144 this scope we can restore the old value of
2145 IDENTIFIER_TYPE_VALUE. */
2146 current_binding_level->shadowed_labels
2147 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2148 current_binding_level->shadowed_labels);
2149 /* Look for the label. */
2150 decl = make_label_decl (id, /*local_p=*/1);
2151 /* Now fill in the information we didn't have before. */
2152 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2157 /* Returns nonzero if it is ill-formed to jump past the declaration of
2158 DECL. Returns 2 if it's also a real problem. */
2161 decl_jump_unsafe (tree decl)
2163 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
2166 if (DECL_INITIAL (decl) == NULL_TREE
2167 && pod_type_p (TREE_TYPE (decl)))
2170 /* This is really only important if we're crossing an initialization.
2171 The POD stuff is just pedantry; why should it matter if the class
2172 contains a field of pointer to member type? */
2173 if (DECL_INITIAL (decl)
2174 || (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))))
2179 /* Check that a single previously seen jump to a newly defined label
2180 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2181 the jump context; NAMES are the names in scope in LEVEL at the jump
2182 context; FILE and LINE are the source position of the jump or 0. */
2185 check_previous_goto_1 (tree decl,
2186 struct cp_binding_level* level,
2187 tree names, const location_t *locus)
2191 struct cp_binding_level *b = current_binding_level;
2192 for (; b; b = b->level_chain)
2194 tree new_decls = b->names;
2195 tree old_decls = (b == level ? names : NULL_TREE);
2196 for (; new_decls != old_decls;
2197 new_decls = TREE_CHAIN (new_decls))
2199 int problem = decl_jump_unsafe (new_decls);
2206 pedwarn ("jump to label `%D'", decl);
2208 pedwarn ("jump to case label");
2211 pedwarn ("%H from here", locus);
2216 cp_error_at (" crosses initialization of `%#D'",
2219 cp_pedwarn_at (" enters scope of non-POD `%#D'",
2225 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2230 pedwarn ("jump to label `%D'", decl);
2232 pedwarn ("jump to case label");
2235 pedwarn ("%H from here", locus);
2238 if (b->kind == sk_try)
2239 error (" enters try block");
2241 error (" enters catch block");
2248 check_previous_goto (struct named_label_use_list* use)
2250 check_previous_goto_1 (use->label_decl, use->binding_level,
2251 use->names_in_scope, &use->o_goto_locus);
2255 check_switch_goto (struct cp_binding_level* level)
2257 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2260 /* Check that any previously seen jumps to a newly defined label DECL
2261 are OK. Called by define_label. */
2264 check_previous_gotos (tree decl)
2266 struct named_label_use_list **usep;
2268 if (! TREE_USED (decl))
2271 for (usep = &named_label_uses; *usep; )
2273 struct named_label_use_list *use = *usep;
2274 if (use->label_decl == decl)
2276 check_previous_goto (use);
2280 usep = &(use->next);
2284 /* Check that a new jump to a label DECL is OK. Called by
2285 finish_goto_stmt. */
2288 check_goto (tree decl)
2292 struct named_label_list *lab;
2294 /* We can't know where a computed goto is jumping. So we assume
2296 if (! DECL_P (decl))
2299 /* If the label hasn't been defined yet, defer checking. */
2300 if (! DECL_INITIAL (decl))
2306 for (lab = named_labels; lab; lab = lab->next)
2307 if (decl == lab->label_decl)
2310 /* If the label is not on named_labels it's a gcc local label, so
2311 it must be in an outer scope, so jumping to it is always OK. */
2315 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2318 cp_pedwarn_at ("jump to label `%D'", decl);
2319 pedwarn (" from here");
2323 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2325 tree b = TREE_VALUE (bad);
2326 int u = decl_jump_unsafe (b);
2328 if (u > 1 && DECL_ARTIFICIAL (b))
2329 /* Can't skip init of __exception_info. */
2330 error ("%J enters catch block", b);
2332 cp_error_at (" skips initialization of `%#D'", b);
2334 cp_pedwarn_at (" enters scope of non-POD `%#D'", b);
2337 if (lab->in_try_scope)
2338 error (" enters try block");
2339 else if (lab->in_catch_scope)
2340 error (" enters catch block");
2343 /* Define a label, specifying the location in the source file.
2344 Return the LABEL_DECL node for the label. */
2347 define_label (location_t location, tree name)
2349 tree decl = lookup_label (name);
2350 struct named_label_list *ent;
2351 struct cp_binding_level *p;
2353 timevar_push (TV_NAME_LOOKUP);
2354 for (ent = named_labels; ent; ent = ent->next)
2355 if (ent->label_decl == decl)
2358 /* After labels, make any new cleanups in the function go into their
2359 own new (temporary) binding contour. */
2360 for (p = current_binding_level;
2361 p->kind != sk_function_parms;
2363 p->more_cleanups_ok = 0;
2365 if (name == get_identifier ("wchar_t"))
2366 pedwarn ("label named wchar_t");
2368 if (DECL_INITIAL (decl) != NULL_TREE)
2369 error ("duplicate label `%D'", decl);
2372 /* Mark label as having been defined. */
2373 DECL_INITIAL (decl) = error_mark_node;
2374 /* Say where in the source. */
2375 DECL_SOURCE_LOCATION (decl) = location;
2378 ent->names_in_scope = current_binding_level->names;
2379 ent->binding_level = current_binding_level;
2381 check_previous_gotos (decl);
2384 timevar_pop (TV_NAME_LOOKUP);
2390 struct cp_binding_level *level;
2391 struct cp_switch *next;
2392 /* The SWITCH_STMT being built. */
2394 /* A splay-tree mapping the low element of a case range to the high
2395 element, or NULL_TREE if there is no high element. Used to
2396 determine whether or not a new case label duplicates an old case
2397 label. We need a tree, rather than simply a hash table, because
2398 of the GNU case range extension. */
2402 /* A stack of the currently active switch statements. The innermost
2403 switch statement is on the top of the stack. There is no need to
2404 mark the stack for garbage collection because it is only active
2405 during the processing of the body of a function, and we never
2406 collect at that point. */
2408 static struct cp_switch *switch_stack;
2410 /* Called right after a switch-statement condition is parsed.
2411 SWITCH_STMT is the switch statement being parsed. */
2414 push_switch (tree switch_stmt)
2416 struct cp_switch *p = xmalloc (sizeof (struct cp_switch));
2417 p->level = current_binding_level;
2418 p->next = switch_stack;
2419 p->switch_stmt = switch_stmt;
2420 p->cases = splay_tree_new (case_compare, NULL, NULL);
2427 struct cp_switch *cs;
2430 splay_tree_delete (cs->cases);
2431 switch_stack = switch_stack->next;
2435 /* Note that we've seen a definition of a case label, and complain if this
2436 is a bad place for one. */
2439 finish_case_label (tree low_value, tree high_value)
2442 struct cp_binding_level *p;
2444 if (processing_template_decl)
2448 /* For templates, just add the case label; we'll do semantic
2449 analysis at instantiation-time. */
2450 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2451 return add_stmt (build_case_label (low_value, high_value, label));
2454 /* Find the condition on which this switch statement depends. */
2455 cond = SWITCH_COND (switch_stack->switch_stmt);
2456 if (cond && TREE_CODE (cond) == TREE_LIST)
2457 cond = TREE_VALUE (cond);
2459 r = c_add_case_label (switch_stack->cases, cond, low_value, high_value);
2461 check_switch_goto (switch_stack->level);
2463 /* After labels, make any new cleanups in the function go into their
2464 own new (temporary) binding contour. */
2465 for (p = current_binding_level;
2466 p->kind != sk_function_parms;
2468 p->more_cleanups_ok = 0;
2473 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2476 typename_hash (const void* k)
2481 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2482 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2487 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2490 typename_compare (const void * k1, const void * k2)
2499 d1 = TYPE_NAME (t1);
2500 d2 = TYPE_NAME (t2);
2502 return (DECL_NAME (d1) == DECL_NAME (d2)
2503 && TYPE_CONTEXT (t1) == TYPE_CONTEXT (t2)
2504 && ((TREE_TYPE (t1) != NULL_TREE)
2505 == (TREE_TYPE (t2) != NULL_TREE))
2506 && same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))
2507 && TYPENAME_TYPE_FULLNAME (t1) == TYPENAME_TYPE_FULLNAME (t2));
2510 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2511 the type of `T', NAME is the IDENTIFIER_NODE for `t'. If BASE_TYPE
2512 is non-NULL, this type is being created by the implicit typename
2513 extension, and BASE_TYPE is a type named `t' in some base class of
2514 `T' which depends on template parameters.
2516 Returns the new TYPENAME_TYPE. */
2518 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2521 build_typename_type (tree context, tree name, tree fullname)
2527 if (typename_htab == NULL)
2529 typename_htab = htab_create_ggc (61, &typename_hash,
2530 &typename_compare, NULL);
2533 /* Build the TYPENAME_TYPE. */
2534 t = make_aggr_type (TYPENAME_TYPE);
2535 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2536 TYPENAME_TYPE_FULLNAME (t) = fullname;
2538 /* Build the corresponding TYPE_DECL. */
2539 d = build_decl (TYPE_DECL, name, t);
2540 TYPE_NAME (TREE_TYPE (d)) = d;
2541 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2542 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2543 DECL_ARTIFICIAL (d) = 1;
2545 /* See if we already have this type. */
2546 e = htab_find_slot (typename_htab, t, INSERT);
2555 /* Resolve `typename CONTEXT::NAME'. Returns an appropriate type,
2556 unless an error occurs, in which case error_mark_node is returned.
2557 If we locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is
2558 set, we return that, rather than the _TYPE it corresponds to, in
2559 other cases we look through the type decl. If TF_ERROR is set,
2560 complain about errors, otherwise be quiet. */
2563 make_typename_type (tree context, tree name, tsubst_flags_t complain)
2567 if (name == error_mark_node
2568 || context == NULL_TREE
2569 || context == error_mark_node)
2570 return error_mark_node;
2574 if (!(TYPE_LANG_SPECIFIC (name)
2575 && (CLASSTYPE_IS_TEMPLATE (name)
2576 || CLASSTYPE_USE_TEMPLATE (name))))
2577 name = TYPE_IDENTIFIER (name);
2579 /* Create a TEMPLATE_ID_EXPR for the type. */
2580 name = build_nt (TEMPLATE_ID_EXPR,
2581 CLASSTYPE_TI_TEMPLATE (name),
2582 CLASSTYPE_TI_ARGS (name));
2584 else if (TREE_CODE (name) == TYPE_DECL)
2585 name = DECL_NAME (name);
2589 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2591 name = TREE_OPERAND (name, 0);
2592 if (TREE_CODE (name) == TEMPLATE_DECL)
2593 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2595 if (TREE_CODE (name) == TEMPLATE_DECL)
2597 error ("`%D' used without template parameters", name);
2598 return error_mark_node;
2600 my_friendly_assert (TREE_CODE (name) == IDENTIFIER_NODE, 20030802);
2602 if (TREE_CODE (context) == NAMESPACE_DECL)
2604 /* We can get here from typename_sub0 in the explicit_template_type
2605 expansion. Just fail. */
2606 if (complain & tf_error)
2607 error ("no class template named `%#T' in `%#T'",
2609 return error_mark_node;
2612 if (!dependent_type_p (context)
2613 || currently_open_class (context))
2615 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2617 tree tmpl = NULL_TREE;
2618 if (IS_AGGR_TYPE (context))
2619 tmpl = lookup_field (context, name, 0, false);
2620 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2622 if (complain & tf_error)
2623 error ("no class template named `%#T' in `%#T'",
2625 return error_mark_node;
2628 if (complain & tf_error)
2629 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2631 return lookup_template_class (tmpl,
2632 TREE_OPERAND (fullname, 1),
2634 /*entering_scope=*/0,
2635 tf_error | tf_warning | tf_user);
2641 if (!IS_AGGR_TYPE (context))
2643 if (complain & tf_error)
2644 error ("no type named `%#T' in `%#T'", name, context);
2645 return error_mark_node;
2648 t = lookup_field (context, name, 0, true);
2651 if (TREE_CODE (t) != TYPE_DECL)
2653 if (complain & tf_error)
2654 error ("no type named `%#T' in `%#T'", name, context);
2655 return error_mark_node;
2658 if (complain & tf_error)
2659 perform_or_defer_access_check (TYPE_BINFO (context), t);
2661 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2669 /* If the CONTEXT is not a template type, then either the field is
2670 there now or its never going to be. */
2671 if (!dependent_type_p (context))
2673 if (complain & tf_error)
2674 error ("no type named `%#T' in `%#T'", name, context);
2675 return error_mark_node;
2678 return build_typename_type (context, name, fullname);
2681 /* Resolve `CONTEXT::template NAME'. Returns an appropriate type,
2682 unless an error occurs, in which case error_mark_node is returned.
2683 If we locate a TYPE_DECL, we return that, rather than the _TYPE it
2684 corresponds to. If COMPLAIN zero, don't complain about any errors
2688 make_unbound_class_template (tree context, tree name, tsubst_flags_t complain)
2694 name = TYPE_IDENTIFIER (name);
2695 else if (DECL_P (name))
2696 name = DECL_NAME (name);
2697 if (TREE_CODE (name) != IDENTIFIER_NODE)
2700 if (!dependent_type_p (context)
2701 || currently_open_class (context))
2703 tree tmpl = NULL_TREE;
2705 if (IS_AGGR_TYPE (context))
2706 tmpl = lookup_field (context, name, 0, false);
2708 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2710 if (complain & tf_error)
2711 error ("no class template named `%#T' in `%#T'", name, context);
2712 return error_mark_node;
2715 if (complain & tf_error)
2716 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2721 /* Build the UNBOUND_CLASS_TEMPLATE. */
2722 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2723 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2724 TREE_TYPE (t) = NULL_TREE;
2726 /* Build the corresponding TEMPLATE_DECL. */
2727 d = build_decl (TEMPLATE_DECL, name, t);
2728 TYPE_NAME (TREE_TYPE (d)) = d;
2729 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2730 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2731 DECL_ARTIFICIAL (d) = 1;
2738 /* A chain of TYPE_DECLs for the builtin types. */
2740 static GTY(()) tree builtin_type_decls;
2742 /* Return a chain of TYPE_DECLs for the builtin types. */
2745 cxx_builtin_type_decls (void)
2747 return builtin_type_decls;
2750 /* Push the declarations of builtin types into the namespace.
2751 RID_INDEX is the index of the builtin type in the array
2752 RID_POINTERS. NAME is the name used when looking up the builtin
2753 type. TYPE is the _TYPE node for the builtin type. */
2756 record_builtin_type (enum rid rid_index,
2760 tree rname = NULL_TREE, tname = NULL_TREE;
2761 tree tdecl = NULL_TREE;
2763 if ((int) rid_index < (int) RID_MAX)
2764 rname = ridpointers[(int) rid_index];
2766 tname = get_identifier (name);
2768 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2769 eliminated. Built-in types should not be looked up name; their
2770 names are keywords that the parser can recognize. However, there
2771 is code in c-common.c that uses identifier_global_value to look
2772 up built-in types by name. */
2775 tdecl = build_decl (TYPE_DECL, tname, type);
2776 DECL_ARTIFICIAL (tdecl) = 1;
2777 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2783 tdecl = build_decl (TYPE_DECL, rname, type);
2784 DECL_ARTIFICIAL (tdecl) = 1;
2786 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2789 if (!TYPE_NAME (type))
2790 TYPE_NAME (type) = tdecl;
2794 TREE_CHAIN (tdecl) = builtin_type_decls;
2795 builtin_type_decls = tdecl;
2799 /* Record one of the standard Java types.
2800 * Declare it as having the given NAME.
2801 * If SIZE > 0, it is the size of one of the integral types;
2802 * otherwise it is the negative of the size of one of the other types. */
2805 record_builtin_java_type (const char* name, int size)
2809 type = make_signed_type (size);
2810 else if (size > -32)
2811 { /* "__java_char" or ""__java_boolean". */
2812 type = make_unsigned_type (-size);
2813 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2816 { /* "__java_float" or ""__java_double". */
2817 type = make_node (REAL_TYPE);
2818 TYPE_PRECISION (type) = - size;
2821 record_builtin_type (RID_MAX, name, type);
2822 decl = TYPE_NAME (type);
2824 /* Suppress generate debug symbol entries for these types,
2825 since for normal C++ they are just clutter.
2826 However, push_lang_context undoes this if extern "Java" is seen. */
2827 DECL_IGNORED_P (decl) = 1;
2829 TYPE_FOR_JAVA (type) = 1;
2833 /* Push a type into the namespace so that the back-ends ignore it. */
2836 record_unknown_type (tree type, const char* name)
2838 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2839 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2840 DECL_IGNORED_P (decl) = 1;
2841 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2842 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2843 TYPE_ALIGN (type) = 1;
2844 TYPE_USER_ALIGN (type) = 0;
2845 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2848 /* An string for which we should create an IDENTIFIER_NODE at
2851 typedef struct predefined_identifier
2853 /* The name of the identifier. */
2854 const char *const name;
2855 /* The place where the IDENTIFIER_NODE should be stored. */
2857 /* Nonzero if this is the name of a constructor or destructor. */
2858 const int ctor_or_dtor_p;
2859 } predefined_identifier;
2861 /* Create all the predefined identifiers. */
2864 initialize_predefined_identifiers (void)
2866 const predefined_identifier *pid;
2868 /* A table of identifiers to create at startup. */
2869 static const predefined_identifier predefined_identifiers[] = {
2870 { "C++", &lang_name_cplusplus, 0 },
2871 { "C", &lang_name_c, 0 },
2872 { "Java", &lang_name_java, 0 },
2873 { CTOR_NAME, &ctor_identifier, 1 },
2874 { "__base_ctor", &base_ctor_identifier, 1 },
2875 { "__comp_ctor", &complete_ctor_identifier, 1 },
2876 { DTOR_NAME, &dtor_identifier, 1 },
2877 { "__comp_dtor", &complete_dtor_identifier, 1 },
2878 { "__base_dtor", &base_dtor_identifier, 1 },
2879 { "__deleting_dtor", &deleting_dtor_identifier, 1 },
2880 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2881 { "nelts", &nelts_identifier, 0 },
2882 { THIS_NAME, &this_identifier, 0 },
2883 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2884 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2885 { "_vptr", &vptr_identifier, 0 },
2886 { "__vtt_parm", &vtt_parm_identifier, 0 },
2887 { "::", &global_scope_name, 0 },
2888 { "std", &std_identifier, 0 },
2892 for (pid = predefined_identifiers; pid->name; ++pid)
2894 *pid->node = get_identifier (pid->name);
2895 if (pid->ctor_or_dtor_p)
2896 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2900 /* Create the predefined scalar types of C,
2901 and some nodes representing standard constants (0, 1, (void *)0).
2902 Initialize the global binding level.
2903 Make definitions for built-in primitive functions. */
2906 cxx_init_decl_processing (void)
2909 tree void_ftype_ptr;
2911 /* Create all the identifiers we need. */
2912 initialize_predefined_identifiers ();
2914 /* Fill in back-end hooks. */
2915 lang_missing_noreturn_ok_p = &cp_missing_noreturn_ok_p;
2917 /* Create the global variables. */
2918 push_to_top_level ();
2920 current_function_decl = NULL_TREE;
2921 current_binding_level = NULL;
2922 /* Enter the global namespace. */
2923 my_friendly_assert (global_namespace == NULL_TREE, 375);
2924 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2926 begin_scope (sk_namespace, global_namespace);
2928 current_lang_name = NULL_TREE;
2930 /* Adjust various flags based on command-line settings. */
2931 if (!flag_permissive)
2932 flag_pedantic_errors = 1;
2933 if (!flag_no_inline)
2935 flag_inline_trees = 1;
2938 if (flag_inline_functions)
2940 flag_inline_trees = 2;
2941 flag_inline_functions = 0;
2944 /* Force minimum function alignment if using the least significant
2945 bit of function pointers to store the virtual bit. */
2946 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2947 && force_align_functions_log < 1)
2948 force_align_functions_log = 1;
2951 current_lang_name = lang_name_c;
2953 build_common_tree_nodes (flag_signed_char);
2955 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2956 TREE_TYPE (error_mark_list) = error_mark_node;
2958 /* Create the `std' namespace. */
2959 push_namespace (std_identifier);
2960 std_node = current_namespace;
2963 c_common_nodes_and_builtins ();
2965 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
2966 java_short_type_node = record_builtin_java_type ("__java_short", 16);
2967 java_int_type_node = record_builtin_java_type ("__java_int", 32);
2968 java_long_type_node = record_builtin_java_type ("__java_long", 64);
2969 java_float_type_node = record_builtin_java_type ("__java_float", -32);
2970 java_double_type_node = record_builtin_java_type ("__java_double", -64);
2971 java_char_type_node = record_builtin_java_type ("__java_char", -16);
2972 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
2974 integer_two_node = build_int_2 (2, 0);
2975 TREE_TYPE (integer_two_node) = integer_type_node;
2976 integer_three_node = build_int_2 (3, 0);
2977 TREE_TYPE (integer_three_node) = integer_type_node;
2979 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
2980 truthvalue_type_node = boolean_type_node;
2981 truthvalue_false_node = boolean_false_node;
2982 truthvalue_true_node = boolean_true_node;
2984 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
2987 record_builtin_type (RID_MAX, NULL, string_type_node);
2990 delta_type_node = ptrdiff_type_node;
2991 vtable_index_type = ptrdiff_type_node;
2993 vtt_parm_type = build_pointer_type (const_ptr_type_node);
2994 void_ftype = build_function_type (void_type_node, void_list_node);
2995 void_ftype_ptr = build_function_type (void_type_node,
2996 tree_cons (NULL_TREE,
3000 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3002 /* C++ extensions */
3004 unknown_type_node = make_node (UNKNOWN_TYPE);
3005 record_unknown_type (unknown_type_node, "unknown type");
3007 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3008 TREE_TYPE (unknown_type_node) = unknown_type_node;
3010 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3012 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3013 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3016 /* Make sure we get a unique function type, so we can give
3017 its pointer type a name. (This wins for gdb.) */
3018 tree vfunc_type = make_node (FUNCTION_TYPE);
3019 TREE_TYPE (vfunc_type) = integer_type_node;
3020 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3021 layout_type (vfunc_type);
3023 vtable_entry_type = build_pointer_type (vfunc_type);
3025 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3028 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3029 layout_type (vtbl_type_node);
3030 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3031 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3032 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3033 layout_type (vtbl_ptr_type_node);
3034 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3036 push_namespace (get_identifier ("__cxxabiv1"));
3037 abi_node = current_namespace;
3040 global_type_node = make_node (LANG_TYPE);
3041 record_unknown_type (global_type_node, "global type");
3044 current_lang_name = lang_name_cplusplus;
3048 tree bad_alloc_type_node;
3049 tree bad_alloc_decl;
3050 tree newtype, deltype;
3051 tree ptr_ftype_sizetype;
3053 push_namespace (std_identifier);
3054 bad_alloc_id = get_identifier ("bad_alloc");
3055 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3056 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3058 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3059 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3060 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3064 = build_function_type (ptr_type_node,
3065 tree_cons (NULL_TREE,
3068 newtype = build_exception_variant
3069 (ptr_ftype_sizetype, add_exception_specifier
3070 (NULL_TREE, bad_alloc_type_node, -1));
3071 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3072 push_cp_library_fn (NEW_EXPR, newtype);
3073 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3074 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3075 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3079 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3081 /* Perform other language dependent initializations. */
3082 init_class_processing ();
3083 init_search_processing ();
3084 init_rtti_processing ();
3086 if (flag_exceptions)
3087 init_exception_processing ();
3089 if (! supports_one_only ())
3092 make_fname_decl = cp_make_fname_decl;
3093 start_fname_decls ();
3095 /* Show we use EH for cleanups. */
3096 using_eh_for_cleanups ();
3098 /* Maintain consistency. Perhaps we should just complain if they
3099 say -fwritable-strings? */
3100 if (flag_writable_strings)
3101 flag_const_strings = 0;
3104 /* Generate an initializer for a function naming variable from
3105 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3106 filled in with the type of the init. */
3109 cp_fname_init (const char* name, tree *type_p)
3111 tree domain = NULL_TREE;
3113 tree init = NULL_TREE;
3118 length = strlen (name);
3119 domain = build_index_type (size_int (length));
3120 init = build_string (length + 1, name);
3123 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3124 type = build_cplus_array_type (type, domain);
3129 TREE_TYPE (init) = type;
3131 init = error_mark_node;
3136 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3137 decl, NAME is the initialization string and TYPE_DEP indicates whether
3138 NAME depended on the type of the function. We make use of that to detect
3139 __PRETTY_FUNCTION__ inside a template fn. This is being done
3140 lazily at the point of first use, so we musn't push the decl now. */
3143 cp_make_fname_decl (tree id, int type_dep)
3145 const char *const name = (type_dep && processing_template_decl
3146 ? NULL : fname_as_string (type_dep));
3148 tree init = cp_fname_init (name, &type);
3149 tree decl = build_decl (VAR_DECL, id, type);
3151 /* As we're using pushdecl_with_scope, we must set the context. */
3152 DECL_CONTEXT (decl) = current_function_decl;
3153 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3155 TREE_STATIC (decl) = 1;
3156 TREE_READONLY (decl) = 1;
3157 DECL_ARTIFICIAL (decl) = 1;
3158 DECL_INITIAL (decl) = init;
3160 TREE_USED (decl) = 1;
3162 if (current_function_decl)
3164 struct cp_binding_level *b = current_binding_level;
3165 while (b->level_chain->kind != sk_function_parms)
3167 pushdecl_with_scope (decl, b);
3168 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3171 pushdecl_top_level_and_finish (decl, init);
3176 /* Make a definition for a builtin function named NAME in the current
3177 namespace, whose data type is TYPE and whose context is CONTEXT.
3178 TYPE should be a function type with argument types.
3180 CLASS and CODE tell later passes how to compile calls to this function.
3181 See tree.h for possible values.
3183 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3184 the name to be called if we can't opencode the function.
3185 If ATTRS is nonzero, use that for the function's attribute
3189 builtin_function_1 (const char* name,
3193 enum built_in_class class,
3194 const char* libname,
3197 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3198 DECL_BUILT_IN_CLASS (decl) = class;
3199 DECL_FUNCTION_CODE (decl) = code;
3200 DECL_CONTEXT (decl) = context;
3204 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3205 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3206 function in the namespace. */
3208 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3209 make_decl_rtl (decl, NULL);
3211 /* Warn if a function in the namespace for users
3212 is used without an occasion to consider it declared. */
3213 if (name[0] != '_' || name[1] != '_')
3214 DECL_ANTICIPATED (decl) = 1;
3216 /* Possibly apply some default attributes to this built-in function. */
3218 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3220 decl_attributes (&decl, NULL_TREE, 0);
3225 /* Entry point for the benefit of c_common_nodes_and_builtins.
3227 Make a definition for a builtin function named NAME and whose data type
3228 is TYPE. TYPE should be a function type with argument types. This
3229 function places the anticipated declaration in the global namespace
3230 and additionally in the std namespace if appropriate.
3232 CLASS and CODE tell later passes how to compile calls to this function.
3233 See tree.h for possible values.
3235 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3236 the name to be called if we can't opencode the function.
3238 If ATTRS is nonzero, use that for the function's attribute
3242 builtin_function (const char* name,
3245 enum built_in_class class,
3246 const char* libname,
3249 /* All builtins that don't begin with an '_' should additionally
3250 go in the 'std' namespace. */
3253 push_namespace (std_identifier);
3254 builtin_function_1 (name, type, std_node, code, class, libname, attrs);
3258 return builtin_function_1 (name, type, NULL_TREE, code,
3259 class, libname, attrs);
3262 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3263 function. Not called directly. */
3266 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3268 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3269 DECL_EXTERNAL (fn) = 1;
3270 TREE_PUBLIC (fn) = 1;
3271 DECL_ARTIFICIAL (fn) = 1;
3272 TREE_NOTHROW (fn) = 1;
3273 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3274 SET_DECL_LANGUAGE (fn, lang_c);
3278 /* Returns the _DECL for a library function with C linkage.
3279 We assume that such functions never throw; if this is incorrect,
3280 callers should unset TREE_NOTHROW. */
3283 build_library_fn (tree name, tree type)
3285 return build_library_fn_1 (name, ERROR_MARK, type);
3288 /* Returns the _DECL for a library function with C++ linkage. */
3291 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3293 tree fn = build_library_fn_1 (name, operator_code, type);
3294 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3295 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3296 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3297 set_mangled_name_for_decl (fn);
3301 /* Like build_library_fn, but takes a C string instead of an
3305 build_library_fn_ptr (const char* name, tree type)
3307 return build_library_fn (get_identifier (name), type);
3310 /* Like build_cp_library_fn, but takes a C string instead of an
3314 build_cp_library_fn_ptr (const char* name, tree type)
3316 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3319 /* Like build_library_fn, but also pushes the function so that we will
3320 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3323 push_library_fn (tree name, tree type)
3325 tree fn = build_library_fn (name, type);
3326 pushdecl_top_level (fn);
3330 /* Like build_cp_library_fn, but also pushes the function so that it
3331 will be found by normal lookup. */
3334 push_cp_library_fn (enum tree_code operator_code, tree type)
3336 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3343 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3347 push_void_library_fn (tree name, tree parmtypes)
3349 tree type = build_function_type (void_type_node, parmtypes);
3350 return push_library_fn (name, type);
3353 /* Like push_library_fn, but also note that this function throws
3354 and does not return. Used for __throw_foo and the like. */
3357 push_throw_library_fn (tree name, tree type)
3359 tree fn = push_library_fn (name, type);
3360 TREE_THIS_VOLATILE (fn) = 1;
3361 TREE_NOTHROW (fn) = 0;
3365 /* When we call finish_struct for an anonymous union, we create
3366 default copy constructors and such. But, an anonymous union
3367 shouldn't have such things; this function undoes the damage to the
3368 anonymous union type T.
3370 (The reason that we create the synthesized methods is that we don't
3371 distinguish `union { int i; }' from `typedef union { int i; } U'.
3372 The first is an anonymous union; the second is just an ordinary
3376 fixup_anonymous_aggr (tree t)
3380 /* Wipe out memory of synthesized methods. */
3381 TYPE_HAS_CONSTRUCTOR (t) = 0;
3382 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3383 TYPE_HAS_INIT_REF (t) = 0;
3384 TYPE_HAS_CONST_INIT_REF (t) = 0;
3385 TYPE_HAS_ASSIGN_REF (t) = 0;
3386 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3388 /* Splice the implicitly generated functions out of the TYPE_METHODS
3390 q = &TYPE_METHODS (t);
3393 if (DECL_ARTIFICIAL (*q))
3394 *q = TREE_CHAIN (*q);
3396 q = &TREE_CHAIN (*q);
3399 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3400 if (TYPE_METHODS (t))
3401 error ("%Jan anonymous union cannot have function members",
3402 TYPE_MAIN_DECL (t));
3404 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3405 assignment operators (because they cannot have these methods themselves).
3406 For anonymous unions this is already checked because they are not allowed
3407 in any union, otherwise we have to check it. */
3408 if (TREE_CODE (t) != UNION_TYPE)
3412 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3413 if (TREE_CODE (field) == FIELD_DECL)
3415 type = TREE_TYPE (field);
3416 if (CLASS_TYPE_P (type))
3418 if (TYPE_NEEDS_CONSTRUCTING (type))
3419 cp_error_at ("member %#D' with constructor not allowed in anonymous aggregate",
3421 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3422 cp_error_at ("member %#D' with destructor not allowed in anonymous aggregate",
3424 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3425 cp_error_at ("member %#D' with copy assignment operator not allowed in anonymous aggregate",
3432 /* Make sure that a declaration with no declarator is well-formed, i.e.
3433 just declares a tagged type or anonymous union.
3435 Returns the type declared; or NULL_TREE if none. */
3438 check_tag_decl (tree declspecs)
3442 int saw_typedef = 0;
3443 tree ob_modifier = NULL_TREE;
3445 /* If a class, struct, or enum type is declared by the DECLSPECS
3446 (i.e, if a class-specifier, enum-specifier, or non-typename
3447 elaborated-type-specifier appears in the DECLSPECS),
3448 DECLARED_TYPE is set to the corresponding type. */
3449 tree declared_type = NULL_TREE;
3450 bool error_p = false;
3452 for (link = declspecs; link; link = TREE_CHAIN (link))
3454 tree value = TREE_VALUE (link);
3456 if (TYPE_P (value) || TREE_CODE (value) == TYPE_DECL
3457 || (TREE_CODE (value) == IDENTIFIER_NODE
3458 && is_typename_at_global_scope (value)))
3462 if (found_type == 2 && TREE_CODE (value) == IDENTIFIER_NODE)
3464 if (! in_system_header)
3465 pedwarn ("redeclaration of C++ built-in type `%T'", value);
3470 && ((TREE_CODE (value) != TYPENAME_TYPE && IS_AGGR_TYPE (value))
3471 || TREE_CODE (value) == ENUMERAL_TYPE))
3473 my_friendly_assert (TYPE_MAIN_DECL (value) != NULL_TREE, 261);
3474 declared_type = value;
3477 else if (value == ridpointers[(int) RID_TYPEDEF])
3479 else if (value == ridpointers[(int) RID_FRIEND])
3481 if (current_class_type == NULL_TREE
3482 || current_scope () != current_class_type)
3483 ob_modifier = value;
3487 else if (value == ridpointers[(int) RID_STATIC]
3488 || value == ridpointers[(int) RID_EXTERN]
3489 || value == ridpointers[(int) RID_AUTO]
3490 || value == ridpointers[(int) RID_REGISTER]
3491 || value == ridpointers[(int) RID_INLINE]
3492 || value == ridpointers[(int) RID_VIRTUAL]
3493 || value == ridpointers[(int) RID_CONST]
3494 || value == ridpointers[(int) RID_VOLATILE]
3495 || value == ridpointers[(int) RID_EXPLICIT]
3496 || value == ridpointers[(int) RID_THREAD])
3497 ob_modifier = value;
3498 else if (value == error_mark_node)
3503 error ("multiple types in one declaration");
3505 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3506 pedwarn ("declaration does not declare anything");
3507 /* Check for an anonymous union. */
3508 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3509 && TYPE_ANONYMOUS_P (declared_type))
3511 /* 7/3 In a simple-declaration, the optional init-declarator-list
3512 can be omitted only when declaring a class (clause 9) or
3513 enumeration (7.2), that is, when the decl-specifier-seq contains
3514 either a class-specifier, an elaborated-type-specifier with
3515 a class-key (9.1), or an enum-specifier. In these cases and
3516 whenever a class-specifier or enum-specifier is present in the
3517 decl-specifier-seq, the identifiers in these specifiers are among
3518 the names being declared by the declaration (as class-name,
3519 enum-names, or enumerators, depending on the syntax). In such
3520 cases, and except for the declaration of an unnamed bit-field (9.6),
3521 the decl-specifier-seq shall introduce one or more names into the
3522 program, or shall redeclare a name introduced by a previous
3523 declaration. [Example:
3524 enum { }; // ill-formed
3525 typedef class { }; // ill-formed
3529 error ("missing type-name in typedef-declaration");
3532 /* Anonymous unions are objects, so they can have specifiers. */;
3533 SET_ANON_AGGR_TYPE_P (declared_type);
3535 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3536 && !in_system_header)
3537 pedwarn ("ISO C++ prohibits anonymous structs");
3540 else if (ob_modifier)
3542 if (ob_modifier == ridpointers[(int) RID_INLINE]
3543 || ob_modifier == ridpointers[(int) RID_VIRTUAL])
3544 error ("`%D' can only be specified for functions", ob_modifier);
3545 else if (ob_modifier == ridpointers[(int) RID_FRIEND])
3546 error ("`%D' can only be specified inside a class", ob_modifier);
3547 else if (ob_modifier == ridpointers[(int) RID_EXPLICIT])
3548 error ("`%D' can only be specified for constructors",
3551 error ("`%D' can only be specified for objects and functions",
3555 return declared_type;
3558 /* Called when a declaration is seen that contains no names to declare.
3559 If its type is a reference to a structure, union or enum inherited
3560 from a containing scope, shadow that tag name for the current scope
3561 with a forward reference.
3562 If its type defines a new named structure or union
3563 or defines an enum, it is valid but we need not do anything here.
3564 Otherwise, it is an error.
3566 C++: may have to grok the declspecs to learn about static,
3567 complain for anonymous unions.
3569 Returns the TYPE declared -- or NULL_TREE if none. */
3572 shadow_tag (tree declspecs)
3574 tree t = check_tag_decl (declspecs);
3579 maybe_process_partial_specialization (t);
3581 /* This is where the variables in an anonymous union are
3582 declared. An anonymous union declaration looks like:
3584 because there is no declarator after the union, the parser
3585 sends that declaration here. */
3586 if (ANON_AGGR_TYPE_P (t))
3588 fixup_anonymous_aggr (t);
3590 if (TYPE_FIELDS (t))
3592 tree decl = grokdeclarator (NULL_TREE, declspecs, NORMAL, 0,
3594 finish_anon_union (decl);
3601 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3604 groktypename (tree typename)
3608 if (TREE_CODE (typename) != TREE_LIST)
3610 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3611 type = grokdeclarator (TREE_VALUE (typename), specs,
3612 TYPENAME, 0, &attrs);
3614 cplus_decl_attributes (&type, attrs, 0);
3618 /* Decode a declarator in an ordinary declaration or data definition.
3619 This is called as soon as the type information and variable name
3620 have been parsed, before parsing the initializer if any.
3621 Here we create the ..._DECL node, fill in its type,
3622 and put it on the list of decls for the current context.
3623 The ..._DECL node is returned as the value.
3625 Exception: for arrays where the length is not specified,
3626 the type is left null, to be filled in by `cp_finish_decl'.
3628 Function definitions do not come here; they go to start_function
3629 instead. However, external and forward declarations of functions
3630 do go through here. Structure field declarations are done by
3631 grokfield and not through here. */
3634 start_decl (tree declarator,
3638 tree prefix_attributes)
3644 /* This should only be done once on the top most decl. */
3645 if (have_extern_spec)
3647 declspecs = tree_cons (NULL_TREE, get_identifier ("extern"),
3649 have_extern_spec = false;
3652 /* An object declared as __attribute__((deprecated)) suppresses
3653 warnings of uses of other deprecated items. */
3654 if (lookup_attribute ("deprecated", attributes))
3655 deprecated_state = DEPRECATED_SUPPRESS;
3657 attributes = chainon (attributes, prefix_attributes);
3659 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3662 deprecated_state = DEPRECATED_NORMAL;
3664 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE)
3667 type = TREE_TYPE (decl);
3669 if (type == error_mark_node)
3672 context = DECL_CONTEXT (decl);
3674 if (initialized && context && TREE_CODE (context) == NAMESPACE_DECL
3675 && context != current_namespace && TREE_CODE (decl) == VAR_DECL)
3677 /* When parsing the initializer, lookup should use the object's
3679 push_decl_namespace (context);
3682 /* We are only interested in class contexts, later. */
3683 if (context && TREE_CODE (context) == NAMESPACE_DECL)
3684 context = NULL_TREE;
3687 /* Is it valid for this decl to have an initializer at all?
3688 If not, set INITIALIZED to zero, which will indirectly
3689 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3690 switch (TREE_CODE (decl))
3693 error ("typedef `%D' is initialized (use __typeof__ instead)", decl);
3698 error ("function `%#D' is initialized like a variable", decl);
3708 if (! toplevel_bindings_p ()
3709 && DECL_EXTERNAL (decl))
3710 warning ("declaration of `%#D' has `extern' and is initialized",
3712 DECL_EXTERNAL (decl) = 0;
3713 if (toplevel_bindings_p ())
3714 TREE_STATIC (decl) = 1;
3716 /* Tell `pushdecl' this is an initialized decl
3717 even though we don't yet have the initializer expression.
3718 Also tell `cp_finish_decl' it may store the real initializer. */
3719 DECL_INITIAL (decl) = error_mark_node;
3722 /* Set attributes here so if duplicate decl, will have proper attributes. */
3723 cplus_decl_attributes (&decl, attributes, 0);
3725 /* If #pragma weak was used, mark the decl weak now. */
3726 if (global_scope_p (current_binding_level))
3727 maybe_apply_pragma_weak (decl);
3729 if (TREE_CODE (decl) == FUNCTION_DECL
3730 && DECL_DECLARED_INLINE_P (decl)
3731 && DECL_UNINLINABLE (decl)
3732 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3733 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
3735 if (context && COMPLETE_TYPE_P (complete_type (context)))
3737 push_nested_class (context);
3739 if (TREE_CODE (decl) == VAR_DECL)
3741 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3742 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3743 error ("`%#D' is not a static member of `%#T'", decl, context);
3746 if (DECL_CONTEXT (field) != context)
3748 if (!same_type_p (DECL_CONTEXT (field), context))
3749 pedwarn ("ISO C++ does not permit `%T::%D' to be defined as `%T::%D'",
3750 DECL_CONTEXT (field), DECL_NAME (decl),
3751 context, DECL_NAME (decl));
3752 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3754 /* Static data member are tricky; an in-class initialization
3755 still doesn't provide a definition, so the in-class
3756 declaration will have DECL_EXTERNAL set, but will have an
3757 initialization. Thus, duplicate_decls won't warn
3758 about this situation, and so we check here. */
3759 if (DECL_INITIAL (decl) && DECL_INITIAL (field))
3760 error ("duplicate initialization of %D", decl);
3761 if (duplicate_decls (decl, field))
3767 tree field = check_classfn (context, decl,
3768 processing_template_decl
3769 > template_class_depth (context));
3770 if (field && duplicate_decls (decl, field))
3774 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3775 DECL_IN_AGGR_P (decl) = 0;
3776 if ((DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3777 || CLASSTYPE_TEMPLATE_INSTANTIATION (context))
3779 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3780 /* [temp.expl.spec] An explicit specialization of a static data
3781 member of a template is a definition if the declaration
3782 includes an initializer; otherwise, it is a declaration.
3784 We check for processing_specialization so this only applies
3785 to the new specialization syntax. */
3786 if (DECL_INITIAL (decl) == NULL_TREE && processing_specialization)
3787 DECL_EXTERNAL (decl) = 1;
3790 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3791 pedwarn ("declaration of `%#D' outside of class is not definition",
3795 /* Enter this declaration into the symbol table. */
3796 tem = maybe_push_decl (decl);
3798 if (processing_template_decl)
3799 tem = push_template_decl (tem);
3800 if (tem == error_mark_node)
3801 return error_mark_node;
3803 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3804 /* Tell the back-end to use or not use .common as appropriate. If we say
3805 -fconserve-space, we want this to save .data space, at the expense of
3806 wrong semantics. If we say -fno-conserve-space, we want this to
3807 produce errors about redefs; to do this we force variables into the
3809 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3810 || !DECL_THREAD_LOCAL (tem))
3811 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3814 if (! processing_template_decl)
3821 start_decl_1 (tree decl)
3823 tree type = TREE_TYPE (decl);
3824 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3826 if (type == error_mark_node)
3829 maybe_push_cleanup_level (type);
3832 /* Is it valid for this decl to have an initializer at all?
3833 If not, set INITIALIZED to zero, which will indirectly
3834 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3836 /* Don't allow initializations for incomplete types except for
3837 arrays which might be completed by the initialization. */
3838 if (COMPLETE_TYPE_P (complete_type (type)))
3839 ; /* A complete type is ok. */
3840 else if (TREE_CODE (type) != ARRAY_TYPE)
3842 error ("variable `%#D' has initializer but incomplete type",
3845 type = TREE_TYPE (decl) = error_mark_node;
3847 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3849 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3850 error ("elements of array `%#D' have incomplete type", decl);
3851 /* else we already gave an error in start_decl. */
3857 && TREE_CODE (decl) != TYPE_DECL
3858 && TREE_CODE (decl) != TEMPLATE_DECL
3859 && type != error_mark_node
3860 && IS_AGGR_TYPE (type)
3861 && ! DECL_EXTERNAL (decl))
3863 if ((! processing_template_decl || ! uses_template_parms (type))
3864 && !COMPLETE_TYPE_P (complete_type (type)))
3866 error ("aggregate `%#D' has incomplete type and cannot be defined",
3868 /* Change the type so that assemble_variable will give
3869 DECL an rtl we can live with: (mem (const_int 0)). */
3870 type = TREE_TYPE (decl) = error_mark_node;
3874 /* If any base type in the hierarchy of TYPE needs a constructor,
3875 then we set initialized to 1. This way any nodes which are
3876 created for the purposes of initializing this aggregate
3877 will live as long as it does. This is necessary for global
3878 aggregates which do not have their initializers processed until
3879 the end of the file. */
3880 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3885 DECL_INITIAL (decl) = NULL_TREE;
3888 /* Handle initialization of references. DECL, TYPE, and INIT have the
3889 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3890 but will be set to a new CLEANUP_STMT if a temporary is created
3891 that must be destroyed subsequently.
3893 Returns an initializer expression to use to initialize DECL, or
3894 NULL if the initialization can be performed statically.
3896 Quotes on semantics can be found in ARM 8.4.3. */
3899 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3903 if (init == NULL_TREE)
3905 if ((DECL_LANG_SPECIFIC (decl) == 0
3906 || DECL_IN_AGGR_P (decl) == 0)
3907 && ! DECL_THIS_EXTERN (decl))
3908 error ("`%D' declared as reference but not initialized", decl);
3912 if (TREE_CODE (init) == CONSTRUCTOR)
3914 error ("ISO C++ forbids use of initializer list to initialize reference `%D'", decl);
3918 if (TREE_CODE (init) == TREE_LIST)
3919 init = build_x_compound_expr_from_list (init, "initializer");
3921 if (TREE_CODE (TREE_TYPE (init)) == REFERENCE_TYPE)
3922 init = convert_from_reference (init);
3924 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3925 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3926 /* Note: default conversion is only called in very special cases. */
3927 init = decay_conversion (init);
3929 /* Convert INIT to the reference type TYPE. This may involve the
3930 creation of a temporary, whose lifetime must be the same as that
3931 of the reference. If so, a DECL_STMT for the temporary will be
3932 added just after the DECL_STMT for DECL. That's why we don't set
3933 DECL_INITIAL for local references (instead assigning to them
3934 explicitly); we need to allow the temporary to be initialized
3936 tmp = initialize_reference (type, init, decl, cleanup);
3938 if (tmp == error_mark_node)
3940 else if (tmp == NULL_TREE)
3942 error ("cannot initialize `%T' from `%T'", type, TREE_TYPE (init));
3946 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3949 DECL_INITIAL (decl) = tmp;
3954 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3955 array until we finish parsing the initializer. If that's the
3956 situation we're in, update DECL accordingly. */
3959 maybe_deduce_size_from_array_init (tree decl, tree init)
3961 tree type = TREE_TYPE (decl);
3963 if (TREE_CODE (type) == ARRAY_TYPE
3964 && TYPE_DOMAIN (type) == NULL_TREE
3965 && TREE_CODE (decl) != TYPE_DECL)
3967 /* do_default is really a C-ism to deal with tentative definitions.
3968 But let's leave it here to ease the eventual merge. */
3969 int do_default = !DECL_EXTERNAL (decl);
3970 tree initializer = init ? init : DECL_INITIAL (decl);
3971 int failure = complete_array_type (type, initializer, do_default);
3974 error ("initializer fails to determine size of `%D'", decl);
3979 error ("array size missing in `%D'", decl);
3980 /* If a `static' var's size isn't known, make it extern as
3981 well as static, so it does not get allocated. If it's not
3982 `static', then don't mark it extern; finish_incomplete_decl
3983 will give it a default size and it will get allocated. */
3984 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3985 DECL_EXTERNAL (decl) = 1;
3988 if (pedantic && TYPE_DOMAIN (type) != NULL_TREE
3989 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3991 error ("zero-size array `%D'", decl);
3993 layout_decl (decl, 0);
3997 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
3998 any appropriate error messages regarding the layout. */
4001 layout_var_decl (tree decl)
4003 tree type = TREE_TYPE (decl);
4005 tree ttype = target_type (type);
4008 /* If we haven't already layed out this declaration, do so now.
4009 Note that we must not call complete type for an external object
4010 because it's type might involve templates that we are not
4011 supposed to instantiate yet. (And it's perfectly valid to say
4012 `extern X x' for some incomplete type `X'.) */
4013 if (!DECL_EXTERNAL (decl))
4014 complete_type (type);
4015 if (!DECL_SIZE (decl)
4016 && TREE_TYPE (decl) != error_mark_node
4017 && (COMPLETE_TYPE_P (type)
4018 || (TREE_CODE (type) == ARRAY_TYPE
4019 && !TYPE_DOMAIN (type)
4020 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4021 layout_decl (decl, 0);
4023 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4025 /* An automatic variable with an incomplete type: that is an error.
4026 Don't talk about array types here, since we took care of that
4027 message in grokdeclarator. */
4028 error ("storage size of `%D' isn't known", decl);
4029 TREE_TYPE (decl) = error_mark_node;
4032 /* Keep this code around in case we later want to control debug info
4033 based on whether a type is "used". (jason 1999-11-11) */
4035 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4036 /* Let debugger know it should output info for this type. */
4037 note_debug_info_needed (ttype);
4039 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4040 note_debug_info_needed (DECL_CONTEXT (decl));
4043 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4044 && DECL_SIZE (decl) != NULL_TREE
4045 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4047 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4048 constant_expression_warning (DECL_SIZE (decl));
4050 error ("storage size of `%D' isn't constant", decl);
4053 if (TREE_STATIC (decl)
4054 && !DECL_ARTIFICIAL (decl)
4055 && current_function_decl
4056 && DECL_CONTEXT (decl) == current_function_decl)
4057 push_local_name (decl);
4060 /* If a local static variable is declared in an inline function, or if
4061 we have a weak definition, we must endeavor to create only one
4062 instance of the variable at link-time. */
4065 maybe_commonize_var (tree decl)
4067 /* Static data in a function with comdat linkage also has comdat
4069 if (TREE_STATIC (decl)
4070 /* Don't mess with __FUNCTION__. */
4071 && ! DECL_ARTIFICIAL (decl)
4072 && DECL_FUNCTION_SCOPE_P (decl)
4073 /* Unfortunately, import_export_decl has not always been called
4074 before the function is processed, so we cannot simply check
4076 && (DECL_COMDAT (DECL_CONTEXT (decl))
4077 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4078 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4079 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4083 /* With weak symbols, we simply make the variable COMDAT;
4084 that will cause copies in multiple translations units to
4086 comdat_linkage (decl);
4090 if (DECL_INITIAL (decl) == NULL_TREE
4091 || DECL_INITIAL (decl) == error_mark_node)
4093 /* Without weak symbols, we can use COMMON to merge
4094 uninitialized variables. */
4095 TREE_PUBLIC (decl) = 1;
4096 DECL_COMMON (decl) = 1;
4100 /* While for initialized variables, we must use internal
4101 linkage -- which means that multiple copies will not
4103 TREE_PUBLIC (decl) = 0;
4104 DECL_COMMON (decl) = 0;
4105 cp_warning_at ("sorry: semantics of inline function static data `%#D' are wrong (you'll wind up with multiple copies)", decl);
4106 warning ("%J you can work around this by removing the initializer",
4111 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4112 /* Set it up again; we might have set DECL_INITIAL since the last
4114 comdat_linkage (decl);
4117 /* Issue an error message if DECL is an uninitialized const variable. */
4120 check_for_uninitialized_const_var (tree decl)
4122 tree type = TREE_TYPE (decl);
4124 /* ``Unless explicitly declared extern, a const object does not have
4125 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4127 if (TREE_CODE (decl) == VAR_DECL
4128 && TREE_CODE (type) != REFERENCE_TYPE
4129 && CP_TYPE_CONST_P (type)
4130 && !TYPE_NEEDS_CONSTRUCTING (type)
4131 && !DECL_INITIAL (decl))
4132 error ("uninitialized const `%D'", decl);
4135 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4136 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4137 initialized. If there are no more such fields, the return value
4141 next_initializable_field (tree field)
4144 && (TREE_CODE (field) != FIELD_DECL
4145 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4146 || DECL_ARTIFICIAL (field)))
4147 field = TREE_CHAIN (field);
4152 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4153 brace-enclosed aggregate initializer.
4155 *INITP is one of a list of initializers describing a brace-enclosed
4156 initializer for an entity of the indicated aggregate TYPE. It may
4157 not presently match the shape of the TYPE; for example:
4159 struct S { int a; int b; };
4160 struct S a[] = { 1, 2, 3, 4 };
4162 Here *INITP will point to TREE_LIST of four elements, rather than a
4163 list of two elements, each itself a list of two elements. This
4164 routine transforms INIT from the former form into the latter. The
4165 revised initializer is returned. */
4168 reshape_init (tree type, tree *initp)
4172 tree old_init_value;
4174 bool brace_enclosed_p;
4177 old_init_value = (TREE_CODE (*initp) == TREE_LIST
4178 ? TREE_VALUE (*initp) : old_init);
4180 my_friendly_assert (old_init_value, 20030723);
4182 /* If the initializer is brace-enclosed, pull initializers from the
4183 enclosed elements. Advance past the brace-enclosed initializer
4185 if (TREE_CODE (old_init_value) == CONSTRUCTOR
4186 && TREE_TYPE (old_init_value) == NULL_TREE
4187 && TREE_HAS_CONSTRUCTOR (old_init_value))
4189 *initp = TREE_CHAIN (old_init);
4190 TREE_CHAIN (old_init) = NULL_TREE;
4191 inits = CONSTRUCTOR_ELTS (old_init_value);
4193 brace_enclosed_p = true;
4198 brace_enclosed_p = false;
4201 /* A non-aggregate type is always initialized with a single
4203 if (!CP_AGGREGATE_TYPE_P (type))
4205 *initp = TREE_CHAIN (old_init);
4206 TREE_CHAIN (old_init) = NULL_TREE;
4207 /* It is invalid to initialize a non-aggregate type with a
4208 brace-enclosed initializer. */
4209 if (brace_enclosed_p)
4211 error ("brace-enclosed initializer used to initialize `%T'",
4213 if (TREE_CODE (old_init) == TREE_LIST)
4214 TREE_VALUE (old_init) = error_mark_node;
4216 old_init = error_mark_node;
4224 All implicit type conversions (clause _conv_) are considered when
4225 initializing the aggregate member with an initializer from an
4226 initializer-list. If the initializer can initialize a member,
4227 the member is initialized. Otherwise, if the member is itself a
4228 non-empty subaggregate, brace elision is assumed and the
4229 initializer is considered for the initialization of the first
4230 member of the subaggregate. */
4231 if (!brace_enclosed_p
4232 && can_convert_arg (type, TREE_TYPE (old_init_value), old_init_value))
4234 *initp = TREE_CHAIN (old_init);
4235 TREE_CHAIN (old_init) = NULL_TREE;
4239 if (TREE_CODE (old_init_value) == STRING_CST
4240 && TREE_CODE (type) == ARRAY_TYPE
4241 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4243 /* [dcl.init.string]
4245 A char array (whether plain char, signed char, or unsigned char)
4246 can be initialized by a string-literal (optionally enclosed in
4247 braces); a wchar_t array can be initialized by a wide
4248 string-literal (optionally enclosed in braces). */
4249 new_init = old_init;
4250 /* Move past the initializer. */
4251 *initp = TREE_CHAIN (old_init);
4252 TREE_CHAIN (old_init) = NULL_TREE;
4256 /* Build a CONSTRUCTOR to hold the contents of the aggregate. */
4257 new_init = build_constructor (type, NULL_TREE);
4258 TREE_HAS_CONSTRUCTOR (new_init) = 1;
4260 if (CLASS_TYPE_P (type))
4264 field = next_initializable_field (TYPE_FIELDS (type));
4270 An initializer for an aggregate member that is an
4271 empty class shall have the form of an empty
4272 initializer-list {}. */
4273 if (!brace_enclosed_p)
4275 error ("initializer for `%T' must be brace-enclosed",
4277 return error_mark_node;
4282 /* Loop through the initializable fields, gathering
4288 /* Handle designated initializers, as an extension. */
4289 if (TREE_PURPOSE (*initp))
4292 pedwarn ("ISO C++ does not allow designated initializers");
4293 field = lookup_field_1 (type, TREE_PURPOSE (*initp),
4294 /*want_type=*/false);
4295 if (!field || TREE_CODE (field) != FIELD_DECL)
4296 error ("`%T' has no non-static data member named `%D'",
4297 type, TREE_PURPOSE (*initp));
4302 field_init = reshape_init (TREE_TYPE (field), initp);
4303 if (field_init == error_mark_node)
4304 return error_mark_node;
4305 TREE_CHAIN (field_init) = CONSTRUCTOR_ELTS (new_init);
4306 CONSTRUCTOR_ELTS (new_init) = field_init;
4309 When a union is initialized with a brace-enclosed
4310 initializer, the braces shall only contain an
4311 initializer for the first member of the union. */
4312 if (TREE_CODE (type) == UNION_TYPE)
4314 field = next_initializable_field (TREE_CHAIN (field));
4318 else if (TREE_CODE (type) == ARRAY_TYPE)
4323 /* If the bound of the array is known, take no more initializers
4324 than are allowed. */
4325 max_index = (TYPE_DOMAIN (type)
4326 ? array_type_nelts (type) : NULL_TREE);
4327 /* Loop through the array elements, gathering initializers. */
4328 for (index = size_zero_node;
4329 *initp && (!max_index || !tree_int_cst_lt (max_index, index));
4330 index = size_binop (PLUS_EXPR, index, size_one_node))
4334 element_init = reshape_init (TREE_TYPE (type), initp);
4335 if (element_init == error_mark_node)
4336 return error_mark_node;
4337 TREE_CHAIN (element_init) = CONSTRUCTOR_ELTS (new_init);
4338 CONSTRUCTOR_ELTS (new_init) = element_init;
4339 if (TREE_PURPOSE (element_init))
4340 index = TREE_PURPOSE (element_init);
4346 /* The initializers were placed in reverse order in the
4348 CONSTRUCTOR_ELTS (new_init) = nreverse (CONSTRUCTOR_ELTS (new_init));
4350 if (TREE_CODE (old_init) == TREE_LIST)
4351 new_init = build_tree_list (TREE_PURPOSE (old_init), new_init);
4354 /* If this was a brace-enclosed initializer and all of the
4355 initializers were not used up, there is a problem. */
4356 if (brace_enclosed_p && *initp)
4357 error ("too many initializers for `%T'", type);
4362 /* Verify INIT (the initializer for DECL), and record the
4363 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4364 grok_reference_init.
4366 If the return value is non-NULL, it is an expression that must be
4367 evaluated dynamically to initialize DECL. */
4370 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4372 tree type = TREE_TYPE (decl);
4374 /* If `start_decl' didn't like having an initialization, ignore it now. */
4375 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4378 /* If an initializer is present, DECL_INITIAL has been
4379 error_mark_node, to indicate that an as-of-yet unevaluated
4380 initialization will occur. From now on, DECL_INITIAL reflects
4381 the static initialization -- if any -- of DECL. */
4382 DECL_INITIAL (decl) = NULL_TREE;
4384 /* Things that are going to be initialized need to have complete
4386 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4388 if (type == error_mark_node)
4389 /* We will have already complained. */
4391 else if (init && COMPLETE_TYPE_P (type)
4392 && !TREE_CONSTANT (TYPE_SIZE (type)))
4394 error ("variable-sized object `%D' may not be initialized", decl);
4397 else if (TREE_CODE (type) == ARRAY_TYPE
4398 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4400 error ("elements of array `%#D' have incomplete type", decl);
4403 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4405 error ("`%D' has incomplete type", decl);
4406 TREE_TYPE (decl) = error_mark_node;
4410 if (TREE_CODE (decl) == CONST_DECL)
4412 my_friendly_assert (TREE_CODE (decl) != REFERENCE_TYPE, 148);
4414 DECL_INITIAL (decl) = init;
4416 my_friendly_assert (init != NULL_TREE, 149);
4419 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4420 init = grok_reference_init (decl, type, init, cleanup);
4423 if (TREE_CODE (init) == CONSTRUCTOR && TREE_HAS_CONSTRUCTOR (init))
4425 /* [dcl.init] paragraph 13,
4426 If T is a scalar type, then a declaration of the form
4431 reshape_init will complain about the extra braces,
4432 and doesn't do anything useful in the case where TYPE is
4433 scalar, so just don't call it. */
4434 if (CP_AGGREGATE_TYPE_P (type))
4435 init = reshape_init (type, &init);
4437 if ((*targetm.vector_opaque_p) (type))
4439 error ("opaque vector types cannot be initialized");
4440 init = error_mark_node;
4444 /* If DECL has an array type without a specific bound, deduce the
4445 array size from the initializer. */
4446 maybe_deduce_size_from_array_init (decl, init);
4447 type = TREE_TYPE (decl);
4448 if (TREE_CODE (init) == CONSTRUCTOR && TREE_HAS_CONSTRUCTOR (init))
4449 TREE_TYPE (init) = type;
4451 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4453 if (TREE_CODE (type) == ARRAY_TYPE)
4454 goto initialize_aggr;
4455 else if (TREE_CODE (init) == CONSTRUCTOR
4456 && TREE_HAS_CONSTRUCTOR (init))
4458 if (TYPE_NON_AGGREGATE_CLASS (type))
4460 error ("`%D' must be initialized by constructor, not by `{...}'",
4462 init = error_mark_node;
4465 goto dont_use_constructor;
4469 int saved_stmts_are_full_exprs_p;
4472 saved_stmts_are_full_exprs_p = 0;
4473 if (building_stmt_tree ())
4475 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4476 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4478 init = build_aggr_init (decl, init, flags);
4479 if (building_stmt_tree ())
4480 current_stmt_tree ()->stmts_are_full_exprs_p =
4481 saved_stmts_are_full_exprs_p;
4487 dont_use_constructor:
4488 if (TREE_CODE (init) != TREE_VEC)
4489 init = store_init_value (decl, init);
4492 else if (DECL_EXTERNAL (decl))
4494 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4495 goto initialize_aggr;
4496 else if (IS_AGGR_TYPE (type))
4498 tree core_type = strip_array_types (type);
4500 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4501 error ("structure `%D' with uninitialized const members", decl);
4502 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4503 error ("structure `%D' with uninitialized reference members",
4506 check_for_uninitialized_const_var (decl);
4509 check_for_uninitialized_const_var (decl);
4511 if (init && init != error_mark_node)
4512 init = build (INIT_EXPR, type, decl, init);
4517 /* If DECL is not a local variable, give it RTL. */
4520 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4522 int toplev = toplevel_bindings_p ();
4525 /* Handle non-variables up front. */
4526 if (TREE_CODE (decl) != VAR_DECL)
4528 rest_of_decl_compilation (decl, asmspec, toplev, at_eof);
4532 /* If we see a class member here, it should be a static data
4534 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4536 my_friendly_assert (TREE_STATIC (decl), 19990828);
4537 /* An in-class declaration of a static data member should be
4538 external; it is only a declaration, and not a definition. */
4539 if (init == NULL_TREE)
4540 my_friendly_assert (DECL_EXTERNAL (decl), 20000723);
4543 /* Set the DECL_ASSEMBLER_NAME for the variable. */
4546 change_decl_assembler_name (decl, get_identifier (asmspec));
4547 /* The `register' keyword, when used together with an
4548 asm-specification, indicates that the variable should be
4549 placed in a particular register. */
4550 if (DECL_REGISTER (decl))
4551 DECL_C_HARD_REGISTER (decl) = 1;
4554 /* We don't create any RTL for local variables. */
4555 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4558 /* We defer emission of local statics until the corresponding
4559 DECL_STMT is expanded. */
4560 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4562 /* We try to defer namespace-scope static constants so that they are
4563 not emitted into the object file unnecessarily. */
4564 if (!DECL_VIRTUAL_P (decl)
4565 && TREE_READONLY (decl)
4566 && DECL_INITIAL (decl) != NULL_TREE
4567 && DECL_INITIAL (decl) != error_mark_node
4568 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4570 && !TREE_PUBLIC (decl))
4572 /* Fool with the linkage of static consts according to #pragma
4574 if (!interface_unknown && !TREE_PUBLIC (decl))
4576 TREE_PUBLIC (decl) = 1;
4577 DECL_EXTERNAL (decl) = interface_only;
4582 /* Likewise for template instantiations. */
4583 else if (DECL_COMDAT (decl))
4586 /* If we're deferring the variable, we only need to make RTL if
4587 there's an ASMSPEC. Otherwise, we'll lazily create it later when
4588 we need it. (There's no way to lazily create RTL for things that
4589 have assembly specs because the information about the specifier
4590 isn't stored in the tree, yet) */
4591 if (defer_p && asmspec)
4592 make_decl_rtl (decl, asmspec);
4593 /* If we're not deferring, go ahead and assemble the variable. */
4595 rest_of_decl_compilation (decl, asmspec, toplev, at_eof);
4598 /* Generate code to initialize DECL (a local variable). */
4601 initialize_local_var (tree decl, tree init)
4603 tree type = TREE_TYPE (decl);
4606 my_friendly_assert (TREE_CODE (decl) == VAR_DECL
4607 || TREE_CODE (decl) == RESULT_DECL,
4609 my_friendly_assert (!TREE_STATIC (decl), 20021010);
4611 if (DECL_SIZE (decl) == NULL_TREE)
4613 /* If we used it already as memory, it must stay in memory. */
4614 DECL_INITIAL (decl) = NULL_TREE;
4615 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4618 if (DECL_SIZE (decl) && type != error_mark_node)
4622 /* Compute and store the initial value. */
4623 already_used = TREE_USED (decl) || TREE_USED (type);
4625 /* Perform the initialization. */
4628 int saved_stmts_are_full_exprs_p;
4630 my_friendly_assert (building_stmt_tree (), 20000906);
4631 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4632 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4633 finish_expr_stmt (init);
4634 current_stmt_tree ()->stmts_are_full_exprs_p =
4635 saved_stmts_are_full_exprs_p;
4638 /* Set this to 0 so we can tell whether an aggregate which was
4639 initialized was ever used. Don't do this if it has a
4640 destructor, so we don't complain about the 'resource
4641 allocation is initialization' idiom. Now set
4642 attribute((unused)) on types so decls of that type will be
4643 marked used. (see TREE_USED, above.) */
4644 if (TYPE_NEEDS_CONSTRUCTING (type)
4646 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4647 && DECL_NAME (decl))
4648 TREE_USED (decl) = 0;
4649 else if (already_used)
4650 TREE_USED (decl) = 1;
4653 /* Generate a cleanup, if necessary. */
4654 cleanup = cxx_maybe_build_cleanup (decl);
4655 if (DECL_SIZE (decl) && cleanup)
4656 finish_decl_cleanup (decl, cleanup);
4659 /* Finish processing of a declaration;
4660 install its line number and initial value.
4661 If the length of an array type is not known before,
4662 it must be determined now, from the initial value, or it is an error.
4664 INIT holds the value of an initializer that should be allowed to escape
4667 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4668 if the (init) syntax was used. */
4671 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4674 tree ttype = NULL_TREE;
4676 const char *asmspec = NULL;
4677 int was_readonly = 0;
4679 if (decl == error_mark_node)
4684 error ("assignment (not initialization) in declaration");
4688 my_friendly_assert (TREE_CODE (decl) != RESULT_DECL, 20030619);
4690 /* Assume no cleanup is required. */
4691 cleanup = NULL_TREE;
4693 /* If a name was specified, get the string. */
4694 if (global_scope_p (current_binding_level))
4695 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4697 asmspec = TREE_STRING_POINTER (asmspec_tree);
4699 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4701 error ("cannot initialize `%D' to namespace `%D'",
4706 if (current_class_type
4707 && CP_DECL_CONTEXT (decl) == current_class_type
4708 && TYPE_BEING_DEFINED (current_class_type)
4709 && (DECL_INITIAL (decl) || init))
4710 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4712 if (TREE_CODE (decl) == VAR_DECL
4713 && DECL_CONTEXT (decl)
4714 && TREE_CODE (DECL_CONTEXT (decl)) == NAMESPACE_DECL
4715 && DECL_CONTEXT (decl) != current_namespace
4718 /* Leave the namespace of the object. */
4719 pop_decl_namespace ();
4722 type = TREE_TYPE (decl);
4724 if (type == error_mark_node)
4727 if (TYPE_HAS_MUTABLE_P (type))
4728 TREE_READONLY (decl) = 0;
4730 if (processing_template_decl)
4732 /* Add this declaration to the statement-tree. */
4733 if (at_function_scope_p ())
4734 add_decl_stmt (decl);
4736 if (init && DECL_INITIAL (decl))
4737 DECL_INITIAL (decl) = init;
4741 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4742 my_friendly_assert (TREE_CODE (decl) != PARM_DECL, 19990828);
4744 /* Take care of TYPE_DECLs up front. */
4745 if (TREE_CODE (decl) == TYPE_DECL)
4747 if (type != error_mark_node
4748 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4750 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4751 warning ("shadowing previous type declaration of `%#D'", decl);
4752 set_identifier_type_value (DECL_NAME (decl), decl);
4755 /* If we have installed this as the canonical typedef for this
4756 type, and that type has not been defined yet, delay emitting
4757 the debug information for it, as we will emit it later. */
4758 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4759 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4760 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4762 rest_of_decl_compilation (decl, NULL,
4763 DECL_CONTEXT (decl) == NULL_TREE, at_eof);
4767 if (TREE_CODE (decl) != FUNCTION_DECL)
4768 ttype = target_type (type);
4770 if (! DECL_EXTERNAL (decl) && TREE_READONLY (decl)
4771 && (TYPE_NEEDS_CONSTRUCTING (type)
4772 || TREE_CODE (type) == REFERENCE_TYPE))
4774 /* Currently, GNU C++ puts constants in text space, making them
4775 impossible to initialize. In the future, one would hope for
4776 an operating system which understood the difference between
4777 initialization and the running of a program. */
4779 TREE_READONLY (decl) = 0;
4782 if (TREE_CODE (decl) == VAR_DECL)
4784 /* Only PODs can have thread-local storage. Other types may require
4785 various kinds of non-trivial initialization. */
4786 if (DECL_THREAD_LOCAL (decl) && !pod_type_p (TREE_TYPE (decl)))
4787 error ("`%D' cannot be thread-local because it has non-POD type `%T'",
4788 decl, TREE_TYPE (decl));
4789 /* Convert the initializer to the type of DECL, if we have not
4790 already initialized DECL. */
4791 if (!DECL_INITIALIZED_P (decl)
4792 /* If !DECL_EXTERNAL then DECL is being defined. In the
4793 case of a static data member initialized inside the
4794 class-specifier, there can be an initializer even if DECL
4795 is *not* defined. */
4796 && (!DECL_EXTERNAL (decl) || init))
4798 init = check_initializer (decl, init, flags, &cleanup);
4799 /* Thread-local storage cannot be dynamically initialized. */
4800 if (DECL_THREAD_LOCAL (decl) && init)
4802 error ("`%D' is thread-local and so cannot be dynamically "
4803 "initialized", decl);
4810 The memory occupied by any object of static storage
4811 duration is zero-initialized at program startup before
4812 any other initialization takes place.
4814 We cannot create an appropriate initializer until after
4815 the type of DECL is finalized. If DECL_INITIAL is set,
4816 then the DECL is statically initialized, and any
4817 necessary zero-initialization has already been performed. */
4818 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
4819 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
4820 /*nelts=*/NULL_TREE,
4821 /*static_storage_p=*/true);
4822 /* Remember that the initialization for this variable has
4824 DECL_INITIALIZED_P (decl) = 1;
4826 /* If the variable has an array type, lay out the type, even if
4827 there is no initializer. It is valid to index through the
4828 array, and we must get TYPE_ALIGN set correctly on the array
4830 else if (TREE_CODE (type) == ARRAY_TYPE)
4834 /* Add this declaration to the statement-tree. This needs to happen
4835 after the call to check_initializer so that the DECL_STMT for a
4836 reference temp is added before the DECL_STMT for the reference itself. */
4837 if (at_function_scope_p ())
4838 add_decl_stmt (decl);
4840 if (TREE_CODE (decl) == VAR_DECL)
4841 layout_var_decl (decl);
4843 /* Output the assembler code and/or RTL code for variables and functions,
4844 unless the type is an undefined structure or union.
4845 If not, it will get done when the type is completed. */
4846 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4848 if (TREE_CODE (decl) == VAR_DECL)
4849 maybe_commonize_var (decl);
4851 make_rtl_for_nonlocal_decl (decl, init, asmspec);
4853 if (TREE_CODE (type) == FUNCTION_TYPE
4854 || TREE_CODE (type) == METHOD_TYPE)
4855 abstract_virtuals_error (decl,
4856 strip_array_types (TREE_TYPE (type)));
4858 abstract_virtuals_error (decl, strip_array_types (type));
4860 if (TREE_CODE (decl) == FUNCTION_DECL
4861 || TREE_TYPE (decl) == error_mark_node)
4862 /* No initialization required. */
4864 else if (DECL_EXTERNAL (decl)
4865 && ! (DECL_LANG_SPECIFIC (decl)
4866 && DECL_NOT_REALLY_EXTERN (decl)))
4869 DECL_INITIAL (decl) = init;
4873 /* A variable definition. */
4874 if (DECL_FUNCTION_SCOPE_P (decl))
4876 /* This is a local declaration. */
4877 maybe_inject_for_scope_var (decl);
4878 /* Initialize the local variable. */
4879 if (processing_template_decl)
4881 if (init || DECL_INITIAL (decl) == error_mark_node)
4882 DECL_INITIAL (decl) = init;
4884 else if (!TREE_STATIC (decl))
4885 initialize_local_var (decl, init);
4888 if (TREE_STATIC (decl))
4889 expand_static_init (decl, init);
4893 /* Undo call to `pushclass' that was done in `start_decl'
4894 due to initialization of qualified member variable.
4895 I.e., Foo::x = 10; */
4897 tree context = CP_DECL_CONTEXT (decl);
4900 && (TREE_CODE (decl) == VAR_DECL
4901 /* We also have a pushclass done that we need to undo here
4902 if we're at top level and declare a method. */
4903 || TREE_CODE (decl) == FUNCTION_DECL)
4904 /* If size hasn't been set, we're still defining it,
4905 and therefore inside the class body; don't pop
4906 the binding level.. */
4907 && COMPLETE_TYPE_P (context)
4908 && context == current_class_type)
4909 pop_nested_class ();
4913 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
4914 reference, insert it in the statement-tree now. */
4921 TREE_READONLY (decl) = 1;
4923 /* If this was marked 'used', be sure it will be output. */
4924 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
4925 mark_referenced (DECL_ASSEMBLER_NAME (decl));
4928 /* This is here for a midend callback from c-common.c. */
4931 finish_decl (tree decl, tree init, tree asmspec_tree)
4933 cp_finish_decl (decl, init, asmspec_tree, 0);
4936 /* Returns a declaration for a VAR_DECL as if:
4938 extern "C" TYPE NAME;
4940 had been seen. Used to create compiler-generated global
4944 declare_global_var (tree name, tree type)
4948 push_to_top_level ();
4949 decl = build_decl (VAR_DECL, name, type);
4950 TREE_PUBLIC (decl) = 1;
4951 DECL_EXTERNAL (decl) = 1;
4952 DECL_ARTIFICIAL (decl) = 1;
4954 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
4955 pop_from_top_level ();
4960 /* Returns a pointer to the `atexit' function. Note that if
4961 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
4962 `__cxa_atexit' function specified in the IA64 C++ ABI. */
4965 get_atexit_node (void)
4976 if (flag_use_cxa_atexit)
4978 /* The declaration for `__cxa_atexit' is:
4980 int __cxa_atexit (void (*)(void *), void *, void *)
4982 We build up the argument types and then then function type
4985 /* First, build the pointer-to-function type for the first
4987 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
4988 fn_type = build_function_type (void_type_node, arg_types);
4989 fn_ptr_type = build_pointer_type (fn_type);
4990 /* Then, build the rest of the argument types. */
4991 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
4992 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
4993 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
4994 /* And the final __cxa_atexit type. */
4995 fn_type = build_function_type (integer_type_node, arg_types);
4996 fn_ptr_type = build_pointer_type (fn_type);
4997 name = "__cxa_atexit";
5001 /* The declaration for `atexit' is:
5003 int atexit (void (*)());
5005 We build up the argument types and then then function type
5007 fn_type = build_function_type (void_type_node, void_list_node);
5008 fn_ptr_type = build_pointer_type (fn_type);
5009 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5010 /* Build the final atexit type. */
5011 fn_type = build_function_type (integer_type_node, arg_types);
5015 /* Now, build the function declaration. */
5016 push_lang_context (lang_name_c);
5017 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5018 mark_used (atexit_fndecl);
5019 pop_lang_context ();
5020 atexit_node = decay_conversion (atexit_fndecl);
5025 /* Returns the __dso_handle VAR_DECL. */
5028 get_dso_handle_node (void)
5030 if (dso_handle_node)
5031 return dso_handle_node;
5033 /* Declare the variable. */
5034 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5037 return dso_handle_node;
5040 /* Begin a new function with internal linkage whose job will be simply
5041 to destroy some particular variable. */
5043 static GTY(()) int start_cleanup_cnt;
5046 start_cleanup_fn (void)
5048 int old_interface_only = interface_only;
5049 int old_interface_unknown = interface_unknown;
5055 push_to_top_level ();
5057 /* No need to mangle this. */
5058 push_lang_context (lang_name_c);
5061 interface_unknown = 1;
5063 /* Build the parameter-types. */
5064 parmtypes = void_list_node;
5065 /* Functions passed to __cxa_atexit take an additional parameter.
5066 We'll just ignore it. After we implement the new calling
5067 convention for destructors, we can eliminate the use of
5068 additional cleanup functions entirely in the -fnew-abi case. */
5069 if (flag_use_cxa_atexit)
5070 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5071 /* Build the function type itself. */
5072 fntype = build_function_type (void_type_node, parmtypes);
5073 /* Build the name of the function. */
5074 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5075 /* Build the function declaration. */
5076 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5077 /* It's a function with internal linkage, generated by the
5079 TREE_PUBLIC (fndecl) = 0;
5080 DECL_ARTIFICIAL (fndecl) = 1;
5081 /* Make the function `inline' so that it is only emitted if it is
5082 actually needed. It is unlikely that it will be inlined, since
5083 it is only called via a function pointer, but we avoid unnecessary
5084 emissions this way. */
5085 DECL_INLINE (fndecl) = 1;
5086 DECL_DECLARED_INLINE_P (fndecl) = 1;
5087 DECL_INTERFACE_KNOWN (fndecl) = 1;
5088 /* Build the parameter. */
5089 if (flag_use_cxa_atexit)
5093 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5094 DECL_CONTEXT (parmdecl) = fndecl;
5095 TREE_USED (parmdecl) = 1;
5096 DECL_ARGUMENTS (fndecl) = parmdecl;
5100 start_function (/*specs=*/NULL_TREE, fndecl, NULL_TREE, SF_PRE_PARSED);
5102 interface_unknown = old_interface_unknown;
5103 interface_only = old_interface_only;
5105 pop_lang_context ();
5107 return current_function_decl;
5110 /* Finish the cleanup function begun by start_cleanup_fn. */
5113 end_cleanup_fn (void)
5115 expand_or_defer_fn (finish_function (0));
5117 pop_from_top_level ();
5120 /* Generate code to handle the destruction of DECL, an object with
5121 static storage duration. */
5124 register_dtor_fn (tree decl)
5131 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5134 /* Call build_cleanup before we enter the anonymous function so that
5135 any access checks will be done relative to the current scope,
5136 rather than the scope of the anonymous function. */
5137 build_cleanup (decl);
5139 /* Now start the function. */
5140 cleanup = start_cleanup_fn ();
5142 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5143 to the original function, rather than the anonymous one. That
5144 will make the back-end think that nested functions are in use,
5145 which causes confusion. */
5147 push_deferring_access_checks (dk_no_check);
5148 fcall = build_cleanup (decl);
5149 pop_deferring_access_checks ();
5151 /* Create the body of the anonymous function. */
5152 compound_stmt = begin_compound_stmt (/*has_no_scope=*/false);
5153 finish_expr_stmt (fcall);
5154 finish_compound_stmt (compound_stmt);
5157 /* Call atexit with the cleanup function. */
5158 cxx_mark_addressable (cleanup);
5159 mark_used (cleanup);
5160 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5161 if (flag_use_cxa_atexit)
5163 args = tree_cons (NULL_TREE,
5164 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5166 args = tree_cons (NULL_TREE, null_pointer_node, args);
5167 args = tree_cons (NULL_TREE, cleanup, args);
5170 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5171 finish_expr_stmt (build_function_call (get_atexit_node (), args));
5174 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5175 is its initializer. Generate code to handle the construction
5176 and destruction of DECL. */
5179 expand_static_init (tree decl, tree init)
5181 my_friendly_assert (TREE_CODE (decl) == VAR_DECL, 20021010);
5182 my_friendly_assert (TREE_STATIC (decl), 20021010);
5184 /* Some variables require no initialization. */
5186 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5187 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5190 if (! toplevel_bindings_p ())
5192 /* Emit code to perform this initialization but once. */
5199 /* Emit code to perform this initialization but once. This code
5202 static int guard = 0;
5204 // Do initialization.
5206 // Register variable for destruction at end of program.
5209 Note that the `temp' variable is only set to 1 *after* the
5210 initialization is complete. This ensures that an exception,
5211 thrown during the construction, will cause the variable to
5212 reinitialized when we pass through this code again, as per:
5216 If the initialization exits by throwing an exception, the
5217 initialization is not complete, so it will be tried again
5218 the next time control enters the declaration.
5220 In theory, this process should be thread-safe, too; multiple
5221 threads should not be able to initialize the variable more
5222 than once. We don't yet attempt to ensure thread-safety. */
5224 /* Create the guard variable. */
5225 guard = get_guard (decl);
5227 /* Begin the conditional initialization. */
5228 if_stmt = begin_if_stmt ();
5229 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5230 then_clause = begin_compound_stmt (/*has_no_scope=*/false);
5232 /* Do the initialization itself. */
5233 assignment = init ? init : NULL_TREE;
5235 /* Once the assignment is complete, set TEMP to 1. Since the
5236 construction of the static object is complete at this point,
5237 we want to make sure TEMP is set to 1 even if a temporary
5238 constructed during the initialization throws an exception
5239 when it is destroyed. So, we combine the initialization and
5240 the assignment to TEMP into a single expression, ensuring
5241 that when we call finish_expr_stmt the cleanups will not be
5242 run until after TEMP is set to 1. */
5243 guard_init = set_guard (guard);
5245 assignment = build_compound_expr (assignment, guard_init);
5247 assignment = guard_init;
5248 finish_expr_stmt (assignment);
5250 /* Use atexit to register a function for destroying this static
5252 register_dtor_fn (decl);
5254 finish_compound_stmt (then_clause);
5255 finish_then_clause (if_stmt);
5259 static_aggregates = tree_cons (init, decl, static_aggregates);
5262 /* Finish the declaration of a catch-parameter. */
5265 start_handler_parms (tree declspecs, tree declarator)
5270 decl = grokdeclarator (declarator, declspecs, CATCHPARM,
5272 if (decl == NULL_TREE)
5273 error ("invalid catch parameter");
5282 /* Make TYPE a complete type based on INITIAL_VALUE.
5283 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5284 2 if there was no information (in which case assume 0 if DO_DEFAULT). */
5287 complete_array_type (tree type, tree initial_value, int do_default)
5289 tree maxindex = NULL_TREE;
5294 /* An array of character type can be initialized from a
5295 brace-enclosed string constant. */
5296 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type)))
5297 && TREE_CODE (initial_value) == CONSTRUCTOR
5298 && CONSTRUCTOR_ELTS (initial_value)
5299 && (TREE_CODE (TREE_VALUE (CONSTRUCTOR_ELTS (initial_value)))
5301 && TREE_CHAIN (CONSTRUCTOR_ELTS (initial_value)) == NULL_TREE)
5302 initial_value = TREE_VALUE (CONSTRUCTOR_ELTS (initial_value));
5304 /* Note MAXINDEX is really the maximum index, one less than the
5306 if (TREE_CODE (initial_value) == STRING_CST)
5309 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
5310 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
5313 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
5315 tree elts = CONSTRUCTOR_ELTS (initial_value);
5317 maxindex = ssize_int (-1);
5318 for (; elts; elts = TREE_CHAIN (elts))
5320 if (TREE_PURPOSE (elts))
5321 maxindex = TREE_PURPOSE (elts);
5323 maxindex = size_binop (PLUS_EXPR, maxindex, ssize_int (1));
5325 maxindex = copy_node (maxindex);
5329 /* Make an error message unless that happened already. */
5330 if (initial_value != error_mark_node)
5333 initial_value = NULL_TREE;
5335 /* Prevent further error messages. */
5336 maxindex = build_int_2 (0, 0);
5343 maxindex = build_int_2 (0, 0);
5352 domain = build_index_type (maxindex);
5353 TYPE_DOMAIN (type) = domain;
5355 if (! TREE_TYPE (maxindex))
5356 TREE_TYPE (maxindex) = domain;
5358 itype = TREE_TYPE (initial_value);
5361 if (itype && !TYPE_DOMAIN (itype))
5362 TYPE_DOMAIN (itype) = domain;
5363 /* The type of the main variant should never be used for arrays
5364 of different sizes. It should only ever be completed with the
5365 size of the array. */
5366 if (! TYPE_DOMAIN (TYPE_MAIN_VARIANT (type)))
5367 TYPE_DOMAIN (TYPE_MAIN_VARIANT (type)) = domain;
5370 /* Lay out the type now that we can get the real answer. */
5377 /* Return zero if something is declared to be a member of type
5378 CTYPE when in the context of CUR_TYPE. STRING is the error
5379 message to print in that case. Otherwise, quietly return 1. */
5382 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5384 if (ctype && ctype != cur_type)
5386 if (flags == DTOR_FLAG)
5387 error ("destructor for alien class `%T' cannot be a member",
5390 error ("constructor for alien class `%T' cannot be a member",
5397 /* Subroutine of `grokdeclarator'. */
5399 /* Generate errors possibly applicable for a given set of specifiers.
5400 This is for ARM $7.1.2. */
5403 bad_specifiers (tree object,
5412 error ("`%D' declared as a `virtual' %s", object, type);
5414 error ("`%D' declared as an `inline' %s", object, type);
5416 error ("`const' and `volatile' function specifiers on `%D' invalid in %s declaration",
5419 cp_error_at ("`%D' declared as a friend", object);
5421 && (TREE_CODE (object) == TYPE_DECL
5422 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5423 && !TYPE_REFFN_P (TREE_TYPE (object))
5424 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5425 cp_error_at ("`%D' declared with an exception specification", object);
5428 /* CTYPE is class type, or null if non-class.
5429 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5431 DECLARATOR is the function's name.
5432 VIRTUALP is truthvalue of whether the function is virtual or not.
5433 FLAGS are to be passed through to `grokclassfn'.
5434 QUALS are qualifiers indicating whether the function is `const'
5436 RAISES is a list of exceptions that this function can raise.
5437 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5438 not look, and -1 if we should not call `grokclassfn' at all.
5440 Returns `NULL_TREE' if something goes wrong, after issuing
5441 applicable error messages. */
5444 grokfndecl (tree ctype,
5447 tree orig_declarator,
5449 enum overload_flags flags,
5461 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5462 int has_default_arg = 0;
5466 type = build_exception_variant (type, raises);
5468 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5469 /* Propagate volatile out from type to decl. */
5470 if (TYPE_VOLATILE (type))
5471 TREE_THIS_VOLATILE (decl) = 1;
5473 /* If this decl has namespace scope, set that up. */
5475 set_decl_namespace (decl, in_namespace, friendp);
5477 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5479 /* `main' and builtins have implicit 'C' linkage. */
5480 if ((MAIN_NAME_P (declarator)
5481 || (IDENTIFIER_LENGTH (declarator) > 10
5482 && IDENTIFIER_POINTER (declarator)[0] == '_'
5483 && IDENTIFIER_POINTER (declarator)[1] == '_'
5484 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5485 && current_lang_name == lang_name_cplusplus
5486 && ctype == NULL_TREE
5487 /* NULL_TREE means global namespace. */
5488 && DECL_CONTEXT (decl) == NULL_TREE)
5489 SET_DECL_LANGUAGE (decl, lang_c);
5491 /* Should probably propagate const out from type to decl I bet (mrs). */
5494 DECL_STATIC_FUNCTION_P (decl) = 1;
5495 DECL_CONTEXT (decl) = ctype;
5499 DECL_CONTEXT (decl) = ctype;
5501 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5503 if (processing_template_decl)
5504 error ("cannot declare `::main' to be a template");
5506 error ("cannot declare `::main' to be inline");
5508 error ("cannot declare `::main' to be static");
5509 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5511 error ("`main' must return `int'");
5516 /* Members of anonymous types and local classes have no linkage; make
5518 /* FIXME what if it gets a name from typedef? */
5519 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5520 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5525 /* [basic.link]: A name with no linkage (notably, the name of a class
5526 or enumeration declared in a local scope) shall not be used to
5527 declare an entity with linkage.
5529 Only check this for public decls for now. See core 319, 389. */
5530 t = no_linkage_check (TREE_TYPE (decl));
5533 if (TYPE_ANONYMOUS_P (t))
5535 if (DECL_EXTERN_C_P (decl))
5536 /* Allow this; it's pretty common in C. */;
5539 pedwarn ("non-local function `%#D' uses anonymous type",
5541 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5543 `%#D' does not refer to the unqualified type, so it is not used for linkage",
5548 pedwarn ("non-local function `%#D' uses local type `%T'",
5553 TREE_PUBLIC (decl) = publicp;
5556 DECL_INTERFACE_KNOWN (decl) = 1;
5557 DECL_NOT_REALLY_EXTERN (decl) = 1;
5560 /* If the declaration was declared inline, mark it as such. */
5562 DECL_DECLARED_INLINE_P (decl) = 1;
5563 /* We inline functions that are explicitly declared inline, or, when
5564 the user explicitly asks us to, all functions. */
5565 if (DECL_DECLARED_INLINE_P (decl)
5566 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5567 DECL_INLINE (decl) = 1;
5569 DECL_EXTERNAL (decl) = 1;
5570 if (quals != NULL_TREE && TREE_CODE (type) == FUNCTION_TYPE)
5572 error ("%smember function `%D' cannot have `%T' method qualifier",
5573 (ctype ? "static " : "non-"), decl, TREE_VALUE (quals));
5577 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5578 grok_op_properties (decl, friendp, /*complain=*/true);
5580 if (ctype && decl_function_context (decl))
5581 DECL_NO_STATIC_CHAIN (decl) = 1;
5583 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5584 if (TREE_PURPOSE (t)
5585 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5587 has_default_arg = 1;
5592 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5596 ("defining explicit specialization `%D' in friend declaration",
5600 tree fns = TREE_OPERAND (orig_declarator, 0);
5601 tree args = TREE_OPERAND (orig_declarator, 1);
5603 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5605 /* Something like `template <class T> friend void f<T>()'. */
5606 error ("invalid use of template-id `%D' in declaration of primary template",
5612 /* A friend declaration of the form friend void f<>(). Record
5613 the information in the TEMPLATE_ID_EXPR. */
5614 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5616 if (TREE_CODE (fns) == COMPONENT_REF)
5618 /* Due to bison parser ickiness, we will have already looked
5619 up an operator_name or PFUNCNAME within the current class
5620 (see template_id in parse.y). If the current class contains
5621 such a name, we'll get a COMPONENT_REF here. Undo that. */
5623 my_friendly_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5624 == current_class_type, 20001120);
5625 fns = TREE_OPERAND (fns, 1);
5627 my_friendly_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5628 || TREE_CODE (fns) == OVERLOAD, 20001120);
5629 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5631 if (has_default_arg)
5633 error ("default arguments are not allowed in declaration of friend template specialization `%D'",
5640 error ("`inline' is not allowed in declaration of friend template specialization `%D'",
5648 /* Make the init_value nonzero so pushdecl knows this is not
5649 tentative. error_mark_node is replaced later with the BLOCK. */
5650 DECL_INITIAL (decl) = error_mark_node;
5652 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5653 TREE_NOTHROW (decl) = 1;
5655 /* Caller will do the rest of this. */
5659 if (flags == NO_SPECIAL && ctype && constructor_name_p (declarator, ctype))
5660 DECL_CONSTRUCTOR_P (decl) = 1;
5662 /* Function gets the ugly name, field gets the nice one. This call
5663 may change the type of the function (because of default
5665 if (ctype != NULL_TREE)
5666 grokclassfn (ctype, decl, flags, quals);
5668 decl = check_explicit_specialization (orig_declarator, decl,
5670 2 * (funcdef_flag != 0) +
5671 4 * (friendp != 0));
5672 if (decl == error_mark_node)
5675 if (ctype != NULL_TREE
5676 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5681 old_decl = check_classfn (ctype, decl,
5682 processing_template_decl
5683 > template_class_depth (ctype));
5685 if (old_decl && TREE_CODE (old_decl) == TEMPLATE_DECL)
5686 /* Because grokfndecl is always supposed to return a
5687 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5688 here. We depend on our callers to figure out that its
5689 really a template that's being returned. */
5690 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5692 if (old_decl && DECL_STATIC_FUNCTION_P (old_decl)
5693 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5695 /* Remove the `this' parm added by grokclassfn.
5696 XXX Isn't this done in start_function, too? */
5697 revert_static_member_fn (decl);
5698 last_function_parms = TREE_CHAIN (last_function_parms);
5700 if (old_decl && DECL_ARTIFICIAL (old_decl))
5701 error ("definition of implicitly-declared `%D'", old_decl);
5707 /* Since we've smashed OLD_DECL to its
5708 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5709 if (TREE_CODE (decl) == TEMPLATE_DECL)
5710 decl = DECL_TEMPLATE_RESULT (decl);
5712 /* Attempt to merge the declarations. This can fail, in
5713 the case of some invalid specialization declarations. */
5715 ok = duplicate_decls (decl, old_decl);
5719 error ("no `%#D' member function declared in class `%T'",
5727 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5730 if (ctype == NULL_TREE || check)
5734 DECL_VIRTUAL_P (decl) = 1;
5739 /* Create a VAR_DECL named NAME with the indicated TYPE.
5741 If SCOPE is non-NULL, it is the class type or namespace containing
5742 the variable. If SCOPE is NULL, the variable should is created in
5743 the innermost enclosings scope. */
5746 grokvardecl (tree type,
5748 RID_BIT_TYPE * specbits_in,
5754 RID_BIT_TYPE specbits;
5756 my_friendly_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE,
5759 specbits = *specbits_in;
5761 /* Compute the scope in which to place the variable. */
5764 /* An explicit "extern" specifier indicates a namespace-scope
5766 if (RIDBIT_SETP (RID_EXTERN, specbits))
5767 scope = current_namespace;
5768 else if (!at_function_scope_p ())
5770 scope = current_scope ();
5772 scope = current_namespace;
5777 && (/* If the variable is a namespace-scope variable declared in a
5778 template, we need DECL_LANG_SPECIFIC. */
5779 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
5780 /* Similarly for namespace-scope variables with language linkage
5782 || (TREE_CODE (scope) == NAMESPACE_DECL
5783 && current_lang_name != lang_name_cplusplus)
5784 /* Similarly for static data members. */
5786 decl = build_lang_decl (VAR_DECL, name, type);
5788 decl = build_decl (VAR_DECL, name, type);
5790 if (scope && TREE_CODE (scope) == NAMESPACE_DECL)
5791 set_decl_namespace (decl, scope, 0);
5793 DECL_CONTEXT (decl) = scope;
5795 if (name && scope && current_lang_name != lang_name_c)
5796 /* We can't mangle lazily here because we don't have any
5797 way to recover whether or not a variable was `extern
5801 if (RIDBIT_SETP (RID_EXTERN, specbits))
5803 DECL_THIS_EXTERN (decl) = 1;
5804 DECL_EXTERNAL (decl) = !initialized;
5807 /* In class context, static means one per class,
5808 public access, and static storage. */
5809 if (DECL_CLASS_SCOPE_P (decl))
5811 TREE_PUBLIC (decl) = 1;
5812 TREE_STATIC (decl) = 1;
5813 DECL_EXTERNAL (decl) = 0;
5815 /* At top level, either `static' or no s.c. makes a definition
5816 (perhaps tentative), and absence of `static' makes it public. */
5817 else if (toplevel_bindings_p ())
5819 TREE_PUBLIC (decl) = (RIDBIT_NOTSETP (RID_STATIC, specbits)
5820 && (DECL_THIS_EXTERN (decl) || ! constp));
5821 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5823 /* Not at top level, only `static' makes a static definition. */
5826 TREE_STATIC (decl) = !! RIDBIT_SETP (RID_STATIC, specbits);
5827 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5830 if (RIDBIT_SETP (RID_THREAD, specbits))
5832 if (targetm.have_tls)
5833 DECL_THREAD_LOCAL (decl) = 1;
5835 /* A mere warning is sure to result in improper semantics
5836 at runtime. Don't bother to allow this to compile. */
5837 error ("thread-local storage not supported for this target");
5840 if (TREE_PUBLIC (decl))
5842 /* [basic.link]: A name with no linkage (notably, the name of a class
5843 or enumeration declared in a local scope) shall not be used to
5844 declare an entity with linkage.
5846 Only check this for public decls for now. */
5847 tree t = no_linkage_check (TREE_TYPE (decl));
5850 if (TYPE_ANONYMOUS_P (t))
5851 /* Ignore for now; `enum { foo } e' is pretty common. */;
5853 pedwarn ("non-local variable `%#D' uses local type `%T'",
5861 /* Create and return a canonical pointer to member function type, for
5862 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
5865 build_ptrmemfunc_type (tree type)
5869 tree unqualified_variant = NULL_TREE;
5871 if (type == error_mark_node)
5874 /* If a canonical type already exists for this type, use it. We use
5875 this method instead of type_hash_canon, because it only does a
5876 simple equality check on the list of field members. */
5878 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
5881 /* Make sure that we always have the unqualified pointer-to-member
5883 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
5885 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
5887 t = make_aggr_type (RECORD_TYPE);
5888 /* Let the front-end know this is a pointer to member function... */
5889 TYPE_PTRMEMFUNC_FLAG (t) = 1;
5890 /* ... and not really an aggregate. */
5891 SET_IS_AGGR_TYPE (t, 0);
5893 field = build_decl (FIELD_DECL, pfn_identifier, type);
5896 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
5897 TREE_CHAIN (field) = fields;
5900 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
5902 /* Zap out the name so that the back-end will give us the debugging
5903 information for this anonymous RECORD_TYPE. */
5904 TYPE_NAME (t) = NULL_TREE;
5906 /* If this is not the unqualified form of this pointer-to-member
5907 type, set the TYPE_MAIN_VARIANT for this type to be the
5908 unqualified type. Since they are actually RECORD_TYPEs that are
5909 not variants of each other, we must do this manually. */
5910 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
5912 t = build_qualified_type (t, cp_type_quals (type));
5913 TYPE_MAIN_VARIANT (t) = unqualified_variant;
5914 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
5915 TYPE_NEXT_VARIANT (unqualified_variant) = t;
5918 /* Cache this pointer-to-member type so that we can find it again
5920 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
5925 /* Create and return a pointer to data member type. */
5928 build_ptrmem_type (tree class_type, tree member_type)
5930 if (TREE_CODE (member_type) == METHOD_TYPE)
5934 arg_types = TYPE_ARG_TYPES (member_type);
5935 class_type = (cp_build_qualified_type
5937 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
5939 = build_method_type_directly (class_type,
5940 TREE_TYPE (member_type),
5941 TREE_CHAIN (arg_types));
5942 return build_ptrmemfunc_type (build_pointer_type (member_type));
5946 my_friendly_assert (TREE_CODE (member_type) != FUNCTION_TYPE,
5948 return build_offset_type (class_type, member_type);
5952 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
5953 Check to see that the definition is valid. Issue appropriate error
5954 messages. Return 1 if the definition is particularly bad, or 0
5958 check_static_variable_definition (tree decl, tree type)
5960 /* Motion 10 at San Diego: If a static const integral data member is
5961 initialized with an integral constant expression, the initializer
5962 may appear either in the declaration (within the class), or in
5963 the definition, but not both. If it appears in the class, the
5964 member is a member constant. The file-scope definition is always
5966 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
5968 error ("invalid in-class initialization of static data member of non-integral type `%T'",
5970 /* If we just return the declaration, crashes will sometimes
5971 occur. We therefore return void_type_node, as if this was a
5972 friend declaration, to cause callers to completely ignore
5973 this declaration. */
5976 else if (!CP_TYPE_CONST_P (type))
5977 error ("ISO C++ forbids in-class initialization of non-const static member `%D'",
5979 else if (pedantic && !INTEGRAL_TYPE_P (type))
5980 pedwarn ("ISO C++ forbids initialization of member constant `%D' of non-integral type `%T'", decl, type);
5985 /* Given the SIZE (i.e., number of elements) in an array, compute an
5986 appropriate index type for the array. If non-NULL, NAME is the
5987 name of the thing being declared. */
5990 compute_array_index_type (tree name, tree size)
5992 tree type = TREE_TYPE (size);
5995 /* The array bound must be an integer type. */
5996 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
5999 error ("size of array `%D' has non-integral type `%T'", name, type);
6001 error ("size of array has non-integral type `%T'", type);
6002 size = integer_one_node;
6003 type = TREE_TYPE (size);
6006 if (abi_version_at_least (2)
6007 /* We should only handle value dependent expressions specially. */
6008 ? value_dependent_expression_p (size)
6009 /* But for abi-1, we handled all instances in templates. This
6010 effects the manglings produced. */
6011 : processing_template_decl)
6012 return build_index_type (build_min (MINUS_EXPR, sizetype,
6013 size, integer_one_node));
6015 /* The size might be the result of a cast. */
6016 STRIP_TYPE_NOPS (size);
6018 /* It might be a const variable or enumeration constant. */
6019 size = decl_constant_value (size);
6021 /* Normally, the array-bound will be a constant. */
6022 if (TREE_CODE (size) == INTEGER_CST)
6024 /* Check to see if the array bound overflowed. Make that an
6025 error, no matter how generous we're being. */
6026 int old_flag_pedantic_errors = flag_pedantic_errors;
6027 int old_pedantic = pedantic;
6028 pedantic = flag_pedantic_errors = 1;
6029 constant_expression_warning (size);
6030 pedantic = old_pedantic;
6031 flag_pedantic_errors = old_flag_pedantic_errors;
6033 /* An array must have a positive number of elements. */
6034 if (INT_CST_LT (size, integer_zero_node))
6037 error ("size of array `%D' is negative", name);
6039 error ("size of array is negative");
6040 size = integer_one_node;
6042 /* Except that an extension we allow zero-sized arrays. We
6043 always allow them in system headers because glibc uses
6045 else if (integer_zerop (size) && pedantic && !in_system_header)
6048 pedwarn ("ISO C++ forbids zero-size array `%D'", name);
6050 pedwarn ("ISO C++ forbids zero-size array");
6053 else if (TREE_CONSTANT (size))
6055 /* `(int) &fn' is not a valid array bound. */
6057 error ("size of array `%D' is not an integral constant-expression",
6060 error ("size of array is not an integral constant-expression");
6065 pedwarn ("ISO C++ forbids variable-size array `%D'", name);
6067 pedwarn ("ISO C++ forbids variable-size array");
6070 if (processing_template_decl && !TREE_CONSTANT (size))
6071 /* A variable sized array. */
6072 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6075 /* Compute the index of the largest element in the array. It is
6076 one less than the number of elements in the array. */
6078 = fold (cp_build_binary_op (MINUS_EXPR,
6079 cp_convert (ssizetype, size),
6080 cp_convert (ssizetype, integer_one_node)));
6081 if (!TREE_CONSTANT (itype))
6082 /* A variable sized array. */
6083 itype = variable_size (itype);
6084 /* Make sure that there was no overflow when creating to a signed
6085 index type. (For example, on a 32-bit machine, an array with
6086 size 2^32 - 1 is too big.) */
6087 else if (TREE_OVERFLOW (itype))
6089 error ("overflow in array dimension");
6090 TREE_OVERFLOW (itype) = 0;
6094 /* Create and return the appropriate index type. */
6095 return build_index_type (itype);
6098 /* Returns the scope (if any) in which the entity declared by
6099 DECLARATOR will be located. If the entity was declared with an
6100 unqualified name, NULL_TREE is returned. */
6103 get_scope_of_declarator (tree declarator)
6108 switch (TREE_CODE (declarator))
6114 /* For any of these, the main declarator is the first operand. */
6115 return get_scope_of_declarator (TREE_OPERAND
6119 /* For a pointer-to-member, continue descending. */
6120 if (TREE_CODE (TREE_OPERAND (declarator, 1))
6122 return get_scope_of_declarator (TREE_OPERAND
6124 /* Otherwise, if the declarator-id is a SCOPE_REF, the scope in
6125 which the declaration occurs is the first operand. */
6126 return TREE_OPERAND (declarator, 0);
6129 /* Attributes to be applied. The declarator is TREE_VALUE. */
6130 return get_scope_of_declarator (TREE_VALUE (declarator));
6133 /* Otherwise, we have a declarator-id which is not a qualified
6134 name; the entity will be declared in the current scope. */
6139 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6140 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6144 create_array_type_for_decl (tree name, tree type, tree size)
6146 tree itype = NULL_TREE;
6147 const char* error_msg;
6149 /* If things have already gone awry, bail now. */
6150 if (type == error_mark_node || size == error_mark_node)
6151 return error_mark_node;
6153 /* Assume that everything will go OK. */
6156 /* There are some types which cannot be array elements. */
6157 switch (TREE_CODE (type))
6160 error_msg = "array of void";
6164 error_msg = "array of functions";
6167 case REFERENCE_TYPE:
6168 error_msg = "array of references";
6172 error_msg = "array of function members";
6179 /* If something went wrong, issue an error-message and return. */
6183 error ("declaration of `%D' as %s", name, error_msg);
6185 error ("creating %s", error_msg);
6187 return error_mark_node;
6192 The constant expressions that specify the bounds of the arrays
6193 can be omitted only for the first member of the sequence. */
6194 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6197 error ("declaration of `%D' as multidimensional array must have bounds for all dimensions except the first",
6200 error ("multidimensional array must have bounds for all dimensions except the first");
6202 return error_mark_node;
6205 /* Figure out the index type for the array. */
6207 itype = compute_array_index_type (name, size);
6209 return build_cplus_array_type (type, itype);
6212 /* Check that it's OK to declare a function with the indicated TYPE.
6213 SFK indicates the kind of special function (if any) that this
6214 function is. OPTYPE is the type given in a conversion operator
6215 declaration. Returns the actual return type of the function; that
6216 may be different than TYPE if an error occurs, or for certain
6217 special functions. */
6220 check_special_function_return_type (special_function_kind sfk,
6226 case sfk_constructor:
6228 error ("return type specification for constructor invalid");
6230 type = void_type_node;
6233 case sfk_destructor:
6235 error ("return type specification for destructor invalid");
6236 type = void_type_node;
6239 case sfk_conversion:
6240 if (type && !same_type_p (type, optype))
6241 error ("operator `%T' declared to return `%T'", optype, type);
6243 pedwarn ("return type specified for `operator %T'", optype);
6255 /* Given declspecs and a declarator (abstract or otherwise), determine
6256 the name and type of the object declared and construct a DECL node
6259 DECLSPECS is a chain of tree_list nodes whose value fields
6260 are the storage classes and type specifiers.
6262 DECL_CONTEXT says which syntactic context this declaration is in:
6263 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6264 FUNCDEF for a function definition. Like NORMAL but a few different
6265 error messages in each case. Return value may be zero meaning
6266 this definition is too screwy to try to parse.
6267 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6268 handle member functions (which have FIELD context).
6269 Return value may be zero meaning this definition is too screwy to
6271 PARM for a parameter declaration (either within a function prototype
6272 or before a function body). Make a PARM_DECL, or return void_type_node.
6273 CATCHPARM for a parameter declaration before a catch clause.
6274 TYPENAME if for a typename (in a cast or sizeof).
6275 Don't make a DECL node; just return the ..._TYPE node.
6276 FIELD for a struct or union field; make a FIELD_DECL.
6277 BITFIELD for a field with specified width.
6278 INITIALIZED is 1 if the decl has an initializer.
6280 ATTRLIST is a pointer to the list of attributes, which may be NULL
6281 if there are none; *ATTRLIST may be modified if attributes from inside
6282 the declarator should be applied to the declaration.
6284 When this function is called, scoping variables (such as
6285 CURRENT_CLASS_TYPE) should reflect the scope in which the
6286 declaration occurs, not the scope in which the new declaration will
6287 be placed. For example, on:
6291 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6292 should not be `S'. */
6295 grokdeclarator (tree declarator,
6297 enum decl_context decl_context,
6301 RID_BIT_TYPE specbits;
6304 tree type = NULL_TREE;
6307 int virtualp, explicitp, friendp, inlinep, staticp;
6308 int explicit_int = 0;
6309 int explicit_char = 0;
6310 int defaulted_int = 0;
6311 int extern_langp = 0;
6312 tree dependant_name = NULL_TREE;
6314 tree typedef_decl = NULL_TREE;
6316 tree typedef_type = NULL_TREE;
6317 int funcdef_flag = 0;
6318 enum tree_code innermost_code = ERROR_MARK;
6321 /* See the code below that used this. */
6322 tree decl_attr = NULL_TREE;
6325 /* Keep track of what sort of function is being processed
6326 so that we can warn about default return values, or explicit
6327 return values which do not match prescribed defaults. */
6328 special_function_kind sfk = sfk_none;
6330 tree dname = NULL_TREE;
6331 tree ctype = current_class_type;
6332 tree ctor_return_type = NULL_TREE;
6333 enum overload_flags flags = NO_SPECIAL;
6334 tree quals = NULL_TREE;
6335 tree raises = NULL_TREE;
6336 int template_count = 0;
6337 tree in_namespace = NULL_TREE;
6338 tree returned_attrs = NULL_TREE;
6339 tree scope = NULL_TREE;
6341 RIDBIT_RESET_ALL (specbits);
6342 if (decl_context == FUNCDEF)
6343 funcdef_flag = 1, decl_context = NORMAL;
6344 else if (decl_context == MEMFUNCDEF)
6345 funcdef_flag = -1, decl_context = FIELD;
6346 else if (decl_context == BITFIELD)
6347 bitfield = 1, decl_context = FIELD;
6349 /* Look inside a declarator for the name being declared
6350 and get it as a string, for an error message. */
6352 tree *next = &declarator;
6356 while (next && *next)
6359 switch (TREE_CODE (decl))
6362 /* For attributes. */
6363 next = &TREE_VALUE (decl);
6368 next = &TREE_OPERAND (decl, 0);
6371 case BIT_NOT_EXPR: /* For C++ destructors! */
6373 tree name = TREE_OPERAND (decl, 0);
6374 tree rename = NULL_TREE;
6376 my_friendly_assert (flags == NO_SPECIAL, 152);
6378 sfk = sfk_destructor;
6380 TREE_OPERAND (decl, 0) = name = constructor_name (name);
6381 my_friendly_assert (TREE_CODE (name) == IDENTIFIER_NODE, 153);
6382 if (ctype == NULL_TREE)
6384 if (current_class_type == NULL_TREE)
6386 error ("destructors must be member functions");
6391 tree t = constructor_name (current_class_type);
6398 tree t = constructor_name (ctype);
6405 error ("destructor `%T' must match class name `%T'",
6407 TREE_OPERAND (decl, 0) = rename;
6413 case ADDR_EXPR: /* C++ reference declaration */
6418 innermost_code = TREE_CODE (decl);
6419 next = &TREE_OPERAND (decl, 0);
6423 innermost_code = TREE_CODE (decl);
6424 if (decl_context == FIELD && ctype == NULL_TREE)
6425 ctype = current_class_type;
6427 && TREE_OPERAND (decl, 0)
6428 && (TREE_CODE (TREE_OPERAND (decl, 0)) == TYPE_DECL
6429 && constructor_name_p (DECL_NAME (TREE_OPERAND (decl, 0)),
6431 TREE_OPERAND (decl, 0) = constructor_name (ctype);
6432 next = &TREE_OPERAND (decl, 0);
6434 if (ctype != NULL_TREE
6435 && decl != NULL_TREE && flags != DTOR_FLAG
6436 && constructor_name_p (decl, ctype))
6438 sfk = sfk_constructor;
6439 ctor_return_type = ctype;
6444 case TEMPLATE_ID_EXPR:
6446 tree fns = TREE_OPERAND (decl, 0);
6449 if (TREE_CODE (dname) == COMPONENT_REF)
6450 dname = TREE_OPERAND (dname, 1);
6451 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6453 my_friendly_assert (is_overloaded_fn (dname),
6455 dname = DECL_NAME (get_first_fn (dname));
6460 case IDENTIFIER_NODE:
6461 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6466 if (C_IS_RESERVED_WORD (dname))
6468 error ("declarator-id missing; using reserved word `%D'",
6470 name = IDENTIFIER_POINTER (dname);
6472 else if (!IDENTIFIER_TYPENAME_P (dname))
6473 name = IDENTIFIER_POINTER (dname);
6476 my_friendly_assert (flags == NO_SPECIAL, 154);
6477 flags = TYPENAME_FLAG;
6478 ctor_return_type = TREE_TYPE (dname);
6479 sfk = sfk_conversion;
6480 if (is_typename_at_global_scope (dname))
6481 name = IDENTIFIER_POINTER (dname);
6483 name = "<invalid operator>";
6490 /* Perform error checking, and decide on a ctype. */
6491 tree cname = TREE_OPERAND (decl, 0);
6492 if (cname == NULL_TREE)
6494 else if (TREE_CODE (cname) == NAMESPACE_DECL)
6497 in_namespace = TREE_OPERAND (decl, 0);
6499 else if (! is_aggr_type (cname, 1))
6501 /* Must test TREE_OPERAND (decl, 1), in case user gives
6502 us `typedef (class::memfunc)(int); memfunc *memfuncptr;' */
6503 else if (TREE_OPERAND (decl, 1)
6504 && TREE_CODE (TREE_OPERAND (decl, 1)) == INDIRECT_REF)
6506 else if (TREE_CODE (cname) == TEMPLATE_TYPE_PARM
6507 || TREE_CODE (cname) == BOUND_TEMPLATE_TEMPLATE_PARM)
6509 /* This might be declaring a member of a template
6510 parm to be a friend. */
6512 dependant_name = TREE_OPERAND (decl, 1);
6514 else if (ctype == NULL_TREE)
6516 else if (TREE_COMPLEXITY (decl) == current_class_depth)
6520 if (! UNIQUELY_DERIVED_FROM_P (cname, ctype))
6522 error ("type `%T' is not derived from type `%T'",
6530 /* It is valid to write:
6532 class C { void f(); };
6536 The standard is not clear about whether `typedef const C D' is
6537 legal; as of 2002-09-15 the committee is considering
6538 that question. EDG 3.0 allows that syntax.
6539 Therefore, we do as well. */
6541 ctype = TYPE_MAIN_VARIANT (ctype);
6542 /* Update the declarator so that when we process it
6543 again the correct type is present. */
6544 TREE_OPERAND (decl, 0) = ctype;
6546 if (ctype && TREE_CODE (TREE_OPERAND (decl, 1)) == TYPE_DECL
6547 && constructor_name_p (DECL_NAME (TREE_OPERAND (decl, 1)),
6549 TREE_OPERAND (decl, 1) = constructor_name (ctype);
6550 next = &TREE_OPERAND (decl, 1);
6556 if (TREE_CODE (name) == BIT_NOT_EXPR)
6557 name = TREE_OPERAND (name, 0);
6559 if (!constructor_name_p (decl, ctype))
6561 else if (decl == name)
6563 sfk = sfk_constructor;
6564 ctor_return_type = ctype;
6568 sfk = sfk_destructor;
6569 ctor_return_type = ctype;
6571 TREE_OPERAND (decl, 0) = constructor_name (ctype);
6572 next = &TREE_OPERAND (decl, 0);
6583 /* Parse error puts this typespec where
6584 a declarator should go. */
6585 error ("`%T' specified as declarator-id", DECL_NAME (decl));
6586 if (TREE_TYPE (decl) == current_class_type)
6587 error (" perhaps you want `%T' for a constructor",
6588 current_class_name);
6589 dname = DECL_NAME (decl);
6590 name = IDENTIFIER_POINTER (dname);
6592 /* Avoid giving two errors for this. */
6593 IDENTIFIER_CLASS_VALUE (dname) = NULL_TREE;
6595 declspecs = tree_cons (NULL_TREE, integer_type_node, declspecs);
6601 next = &BASELINK_FUNCTIONS (decl);
6605 /* Sometimes, we see a template-name used as part of a
6606 decl-specifier like in
6607 std::allocator alloc;
6608 Handle that gracefully. */
6609 error ("invalid use of template-name '%E' in a declarator", decl);
6610 return error_mark_node;
6614 my_friendly_assert (0, 20020917);
6619 /* A function definition's declarator must have the form of
6620 a function declarator. */
6622 if (funcdef_flag && innermost_code != CALL_EXPR)
6625 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6626 && innermost_code != CALL_EXPR
6627 && ! (ctype && declspecs == NULL_TREE))
6629 error ("declaration of `%D' as non-function", dname);
6630 return void_type_node;
6633 /* Anything declared one level down from the top level
6634 must be one of the parameters of a function
6635 (because the body is at least two levels down). */
6637 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6638 by not allowing C++ class definitions to specify their parameters
6639 with xdecls (must be spec.d in the parmlist).
6641 Since we now wait to push a class scope until we are sure that
6642 we are in a legitimate method context, we must set oldcname
6643 explicitly (since current_class_name is not yet alive).
6645 We also want to avoid calling this a PARM if it is in a namespace. */
6647 if (decl_context == NORMAL && !toplevel_bindings_p ())
6649 struct cp_binding_level *b = current_binding_level;
6650 current_binding_level = b->level_chain;
6651 if (current_binding_level != 0 && toplevel_bindings_p ())
6652 decl_context = PARM;
6653 current_binding_level = b;
6657 name = decl_context == PARM ? "parameter" : "type name";
6659 /* Look through the decl specs and record which ones appear.
6660 Some typespecs are defined as built-in typenames.
6661 Others, the ones that are modifiers of other types,
6662 are represented by bits in SPECBITS: set the bits for
6663 the modifiers that appear. Storage class keywords are also in SPECBITS.
6665 If there is a typedef name or a type, store the type in TYPE.
6666 This includes builtin typedefs such as `int'.
6668 Set EXPLICIT_INT if the type is `int' or `char' and did not
6669 come from a user typedef.
6671 Set LONGLONG if `long' is mentioned twice.
6673 For C++, constructors and destructors have their own fast treatment. */
6675 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
6680 /* Certain parse errors slip through. For example,
6681 `int class;' is not caught by the parser. Try
6682 weakly to recover here. */
6683 if (TREE_CODE (spec) != TREE_LIST)
6686 id = TREE_VALUE (spec);
6688 /* If the entire declaration is itself tagged as deprecated then
6689 suppress reports of deprecated items. */
6690 if (!adding_implicit_members && id && TREE_DEPRECATED (id))
6692 if (deprecated_state != DEPRECATED_SUPPRESS)
6693 warn_deprecated_use (id);
6696 if (TREE_CODE (id) == IDENTIFIER_NODE)
6698 if (id == ridpointers[(int) RID_INT]
6699 || id == ridpointers[(int) RID_CHAR]
6700 || id == ridpointers[(int) RID_BOOL]
6701 || id == ridpointers[(int) RID_WCHAR])
6705 if (id == ridpointers[(int) RID_BOOL])
6706 error ("`bool' is now a keyword");
6708 error ("extraneous `%T' ignored", id);
6712 if (id == ridpointers[(int) RID_INT])
6714 else if (id == ridpointers[(int) RID_CHAR])
6716 type = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (id));
6720 /* C++ aggregate types. */
6721 if (IDENTIFIER_HAS_TYPE_VALUE (id))
6724 error ("multiple declarations `%T' and `%T'", type, id);
6726 type = IDENTIFIER_TYPE_VALUE (id);
6730 for (i = (int) RID_FIRST_MODIFIER; i <= (int) RID_LAST_MODIFIER; i++)
6732 if (ridpointers[i] == id)
6734 if (i == (int) RID_LONG && RIDBIT_SETP (i, specbits))
6736 if (pedantic && ! in_system_header && warn_long_long)
6737 pedwarn ("ISO C++ does not support `long long'");
6739 error ("`long long long' is too long for GCC");
6743 else if (RIDBIT_SETP (i, specbits))
6744 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
6746 /* Diagnose "__thread extern" or "__thread static". */
6747 if (RIDBIT_SETP (RID_THREAD, specbits))
6749 if (i == (int)RID_EXTERN)
6750 error ("`__thread' before `extern'");
6751 else if (i == (int)RID_STATIC)
6752 error ("`__thread' before `static'");
6755 if (i == (int)RID_EXTERN
6756 && TREE_PURPOSE (spec) == error_mark_node)
6757 /* This extern was part of a language linkage. */
6760 RIDBIT_SET (i, specbits);
6765 else if (TREE_CODE (id) == TYPE_DECL)
6768 error ("multiple declarations `%T' and `%T'", type,
6772 type = TREE_TYPE (id);
6773 TREE_VALUE (spec) = type;
6779 error ("two or more data types in declaration of `%s'", name);
6780 else if (TREE_CODE (id) == IDENTIFIER_NODE)
6782 tree t = lookup_name (id, 1);
6783 if (!t || TREE_CODE (t) != TYPE_DECL)
6784 error ("`%s' fails to be a typedef or built in type",
6785 IDENTIFIER_POINTER (id));
6788 type = TREE_TYPE (t);
6792 else if (id != error_mark_node)
6793 /* Can't change CLASS nodes into RECORD nodes here! */
6800 /* See the code below that used this. */
6802 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6804 typedef_type = type;
6806 /* No type at all: default to `int', and set DEFAULTED_INT
6807 because it was not a user-defined typedef. */
6809 if (type == NULL_TREE
6810 && (RIDBIT_SETP (RID_SIGNED, specbits)
6811 || RIDBIT_SETP (RID_UNSIGNED, specbits)
6812 || RIDBIT_SETP (RID_LONG, specbits)
6813 || RIDBIT_SETP (RID_SHORT, specbits)))
6815 /* These imply 'int'. */
6816 type = integer_type_node;
6820 if (sfk != sfk_none)
6821 type = check_special_function_return_type (sfk, type,
6823 else if (type == NULL_TREE)
6829 /* We handle `main' specially here, because 'main () { }' is so
6830 common. With no options, it is allowed. With -Wreturn-type,
6831 it is a warning. It is only an error with -pedantic-errors. */
6832 is_main = (funcdef_flag
6833 && dname && MAIN_NAME_P (dname)
6834 && ctype == NULL_TREE
6835 && in_namespace == NULL_TREE
6836 && current_namespace == global_namespace);
6838 if (in_system_header || flag_ms_extensions)
6839 /* Allow it, sigh. */;
6840 else if (pedantic || ! is_main)
6841 pedwarn ("ISO C++ forbids declaration of `%s' with no type",
6843 else if (warn_return_type)
6844 warning ("ISO C++ forbids declaration of `%s' with no type",
6847 type = integer_type_node;
6852 /* Now process the modifiers that were specified
6853 and check for invalid combinations. */
6855 /* Long double is a special combination. */
6857 if (RIDBIT_SETP (RID_LONG, specbits)
6858 && TYPE_MAIN_VARIANT (type) == double_type_node)
6860 RIDBIT_RESET (RID_LONG, specbits);
6861 type = build_qualified_type (long_double_type_node,
6862 cp_type_quals (type));
6865 /* Check all other uses of type modifiers. */
6867 if (RIDBIT_SETP (RID_UNSIGNED, specbits)
6868 || RIDBIT_SETP (RID_SIGNED, specbits)
6869 || RIDBIT_SETP (RID_LONG, specbits)
6870 || RIDBIT_SETP (RID_SHORT, specbits))
6874 if (TREE_CODE (type) == REAL_TYPE)
6875 error ("short, signed or unsigned invalid for `%s'", name);
6876 else if (TREE_CODE (type) != INTEGER_TYPE)
6877 error ("long, short, signed or unsigned invalid for `%s'", name);
6878 else if (RIDBIT_SETP (RID_LONG, specbits)
6879 && RIDBIT_SETP (RID_SHORT, specbits))
6880 error ("long and short specified together for `%s'", name);
6881 else if ((RIDBIT_SETP (RID_LONG, specbits)
6882 || RIDBIT_SETP (RID_SHORT, specbits))
6884 error ("long or short specified with char for `%s'", name);
6885 else if ((RIDBIT_SETP (RID_LONG, specbits)
6886 || RIDBIT_SETP (RID_SHORT, specbits))
6887 && TREE_CODE (type) == REAL_TYPE)
6888 error ("long or short specified with floating type for `%s'", name);
6889 else if (RIDBIT_SETP (RID_SIGNED, specbits)
6890 && RIDBIT_SETP (RID_UNSIGNED, specbits))
6891 error ("signed and unsigned given together for `%s'", name);
6895 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6897 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
6899 if (flag_pedantic_errors)
6904 /* Discard the type modifiers if they are invalid. */
6907 RIDBIT_RESET (RID_UNSIGNED, specbits);
6908 RIDBIT_RESET (RID_SIGNED, specbits);
6909 RIDBIT_RESET (RID_LONG, specbits);
6910 RIDBIT_RESET (RID_SHORT, specbits);
6915 if (RIDBIT_SETP (RID_COMPLEX, specbits)
6916 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
6918 error ("complex invalid for `%s'", name);
6919 RIDBIT_RESET (RID_COMPLEX, specbits);
6922 /* Decide whether an integer type is signed or not.
6923 Optionally treat bitfields as signed by default. */
6924 if (RIDBIT_SETP (RID_UNSIGNED, specbits)
6927 It is implementation-defined whether a plain (neither
6928 explicitly signed or unsigned) char, short, int, or long
6929 bit-field is signed or unsigned.
6931 Naturally, we extend this to long long as well. Note that
6932 this does not include wchar_t. */
6933 || (bitfield && !flag_signed_bitfields
6934 && RIDBIT_NOTSETP (RID_SIGNED, specbits)
6935 /* A typedef for plain `int' without `signed' can be
6936 controlled just like plain `int', but a typedef for
6937 `signed int' cannot be so controlled. */
6939 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
6940 && (TREE_CODE (type) == INTEGER_TYPE
6941 || TREE_CODE (type) == CHAR_TYPE)
6942 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
6945 type = long_long_unsigned_type_node;
6946 else if (RIDBIT_SETP (RID_LONG, specbits))
6947 type = long_unsigned_type_node;
6948 else if (RIDBIT_SETP (RID_SHORT, specbits))
6949 type = short_unsigned_type_node;
6950 else if (type == char_type_node)
6951 type = unsigned_char_type_node;
6952 else if (typedef_decl)
6953 type = c_common_unsigned_type (type);
6955 type = unsigned_type_node;
6957 else if (RIDBIT_SETP (RID_SIGNED, specbits)
6958 && type == char_type_node)
6959 type = signed_char_type_node;
6961 type = long_long_integer_type_node;
6962 else if (RIDBIT_SETP (RID_LONG, specbits))
6963 type = long_integer_type_node;
6964 else if (RIDBIT_SETP (RID_SHORT, specbits))
6965 type = short_integer_type_node;
6967 if (RIDBIT_SETP (RID_COMPLEX, specbits))
6969 /* If we just have "complex", it is equivalent to
6970 "complex double", but if any modifiers at all are specified it is
6971 the complex form of TYPE. E.g, "complex short" is
6972 "complex short int". */
6974 if (defaulted_int && ! longlong
6975 && ! (RIDBIT_SETP (RID_LONG, specbits)
6976 || RIDBIT_SETP (RID_SHORT, specbits)
6977 || RIDBIT_SETP (RID_SIGNED, specbits)
6978 || RIDBIT_SETP (RID_UNSIGNED, specbits)))
6979 type = complex_double_type_node;
6980 else if (type == integer_type_node)
6981 type = complex_integer_type_node;
6982 else if (type == float_type_node)
6983 type = complex_float_type_node;
6984 else if (type == double_type_node)
6985 type = complex_double_type_node;
6986 else if (type == long_double_type_node)
6987 type = complex_long_double_type_node;
6989 type = build_complex_type (type);
6992 type_quals = TYPE_UNQUALIFIED;
6993 if (RIDBIT_SETP (RID_CONST, specbits))
6994 type_quals |= TYPE_QUAL_CONST;
6995 if (RIDBIT_SETP (RID_VOLATILE, specbits))
6996 type_quals |= TYPE_QUAL_VOLATILE;
6997 if (RIDBIT_SETP (RID_RESTRICT, specbits))
6998 type_quals |= TYPE_QUAL_RESTRICT;
6999 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7000 error ("qualifiers are not allowed on declaration of `operator %T'",
7003 type_quals |= cp_type_quals (type);
7004 type = cp_build_qualified_type_real
7005 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7006 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
7007 /* We might have ignored or rejected some of the qualifiers. */
7008 type_quals = cp_type_quals (type);
7011 inlinep = !! RIDBIT_SETP (RID_INLINE, specbits);
7012 virtualp = RIDBIT_SETP (RID_VIRTUAL, specbits);
7013 RIDBIT_RESET (RID_VIRTUAL, specbits);
7014 explicitp = RIDBIT_SETP (RID_EXPLICIT, specbits) != 0;
7015 RIDBIT_RESET (RID_EXPLICIT, specbits);
7017 if (RIDBIT_SETP (RID_STATIC, specbits))
7018 staticp = 1 + (decl_context == FIELD);
7020 if (virtualp && staticp == 2)
7022 error ("member `%D' cannot be declared both virtual and static",
7026 friendp = RIDBIT_SETP (RID_FRIEND, specbits);
7027 RIDBIT_RESET (RID_FRIEND, specbits);
7029 if (dependant_name && !friendp)
7031 error ("`%T::%D' is not a valid declarator", ctype, dependant_name);
7032 return void_type_node;
7035 /* Warn if two storage classes are given. Default to `auto'. */
7037 if (RIDBIT_ANY_SET (specbits))
7039 if (RIDBIT_SETP (RID_STATIC, specbits)) nclasses++;
7040 if (RIDBIT_SETP (RID_EXTERN, specbits) && !extern_langp) nclasses++;
7041 if (RIDBIT_SETP (RID_THREAD, specbits)) nclasses++;
7042 if (decl_context == PARM && nclasses > 0)
7043 error ("storage class specifiers invalid in parameter declarations");
7044 if (RIDBIT_SETP (RID_TYPEDEF, specbits))
7046 if (decl_context == PARM)
7047 error ("typedef declaration invalid in parameter declaration");
7050 if (RIDBIT_SETP (RID_AUTO, specbits)) nclasses++;
7051 if (RIDBIT_SETP (RID_REGISTER, specbits)) nclasses++;
7052 if (!nclasses && !friendp && extern_langp)
7056 /* Give error if `virtual' is used outside of class declaration. */
7058 && (current_class_name == NULL_TREE || decl_context != FIELD))
7060 error ("virtual outside class declaration");
7064 /* Static anonymous unions are dealt with here. */
7065 if (staticp && decl_context == TYPENAME
7066 && TREE_CODE (declspecs) == TREE_LIST
7067 && ANON_AGGR_TYPE_P (TREE_VALUE (declspecs)))
7068 decl_context = FIELD;
7070 /* Warn about storage classes that are invalid for certain
7071 kinds of declarations (parameters, typenames, etc.). */
7073 /* "static __thread" and "extern __thread" are allowed. */
7075 && RIDBIT_SETP (RID_THREAD, specbits)
7076 && (RIDBIT_SETP (RID_EXTERN, specbits)
7077 || RIDBIT_SETP (RID_STATIC, specbits)))
7081 error ("multiple storage classes in declaration of `%s'", name);
7082 else if (decl_context != NORMAL && nclasses > 0)
7084 if ((decl_context == PARM || decl_context == CATCHPARM)
7085 && (RIDBIT_SETP (RID_REGISTER, specbits)
7086 || RIDBIT_SETP (RID_AUTO, specbits)))
7088 else if (RIDBIT_SETP (RID_TYPEDEF, specbits))
7090 else if (decl_context == FIELD
7091 /* C++ allows static class elements. */
7092 && RIDBIT_SETP (RID_STATIC, specbits))
7093 /* C++ also allows inlines and signed and unsigned elements,
7094 but in those cases we don't come in here. */
7098 if (decl_context == FIELD)
7100 tree tmp = NULL_TREE;
7105 /* Avoid trying to get an operand off an identifier node. */
7106 if (TREE_CODE (declarator) == IDENTIFIER_NODE)
7109 tmp = TREE_OPERAND (declarator, 0);
7110 op = IDENTIFIER_OPNAME_P (tmp);
7111 if (IDENTIFIER_TYPENAME_P (tmp))
7113 if (is_typename_at_global_scope (tmp))
7114 name = IDENTIFIER_POINTER (tmp);
7116 name = "<invalid operator>";
7119 error ("storage class specified for %s `%s'",
7120 op ? "member operator" : "field",
7125 if (decl_context == PARM || decl_context == CATCHPARM)
7126 error ("storage class specified for parameter `%s'", name);
7128 error ("storage class specified for typename");
7130 RIDBIT_RESET (RID_REGISTER, specbits);
7131 RIDBIT_RESET (RID_AUTO, specbits);
7132 RIDBIT_RESET (RID_EXTERN, specbits);
7133 RIDBIT_RESET (RID_THREAD, specbits);
7136 else if (RIDBIT_SETP (RID_EXTERN, specbits) && initialized && !funcdef_flag)
7138 if (toplevel_bindings_p ())
7140 /* It's common practice (and completely valid) to have a const
7141 be initialized and declared extern. */
7142 if (!(type_quals & TYPE_QUAL_CONST))
7143 warning ("`%s' initialized and declared `extern'", name);
7146 error ("`%s' has both `extern' and initializer", name);
7148 else if (RIDBIT_SETP (RID_EXTERN, specbits) && funcdef_flag
7149 && ! toplevel_bindings_p ())
7150 error ("nested function `%s' declared `extern'", name);
7151 else if (toplevel_bindings_p ())
7153 if (RIDBIT_SETP (RID_AUTO, specbits))
7154 error ("top-level declaration of `%s' specifies `auto'", name);
7156 else if (RIDBIT_SETP (RID_THREAD, specbits)
7157 && !RIDBIT_SETP (RID_EXTERN, specbits)
7158 && !RIDBIT_SETP (RID_STATIC, specbits))
7160 error ("function-scope `%s' implicitly auto and declared `__thread'",
7162 RIDBIT_RESET (RID_THREAD, specbits);
7165 if (nclasses > 0 && friendp)
7166 error ("storage class specifiers invalid in friend function declarations");
7168 scope = get_scope_of_declarator (declarator);
7170 /* Now figure out the structure of the declarator proper.
7171 Descend through it, creating more complex types, until we reach
7172 the declared identifier (or NULL_TREE, in an abstract declarator). */
7174 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE
7175 && TREE_CODE (declarator) != TEMPLATE_ID_EXPR)
7177 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
7178 an INDIRECT_REF (for *...),
7179 a CALL_EXPR (for ...(...)),
7180 an identifier (for the name being declared)
7181 or a null pointer (for the place in an absolute declarator
7182 where the name was omitted).
7183 For the last two cases, we have just exited the loop.
7185 For C++ it could also be
7186 a SCOPE_REF (for class :: ...). In this case, we have converted
7187 sensible names to types, and those are the values we use to
7188 qualify the member name.
7189 an ADDR_EXPR (for &...),
7190 a BIT_NOT_EXPR (for destructors)
7192 At this point, TYPE is the type of elements of an array,
7193 or for a function to return, or for a pointer to point to.
7194 After this sequence of ifs, TYPE is the type of the
7195 array or function or pointer, and DECLARATOR has had its
7196 outermost layer removed. */
7198 if (type == error_mark_node)
7200 if (declarator == error_mark_node)
7201 return error_mark_node;
7202 else if (TREE_CODE (declarator) == SCOPE_REF)
7203 declarator = TREE_OPERAND (declarator, 1);
7205 declarator = TREE_OPERAND (declarator, 0);
7208 if (quals != NULL_TREE
7209 && (declarator == NULL_TREE
7210 || TREE_CODE (declarator) != SCOPE_REF))
7212 if (ctype == NULL_TREE && TREE_CODE (type) == METHOD_TYPE)
7213 ctype = TYPE_METHOD_BASETYPE (type);
7214 if (ctype != NULL_TREE)
7216 tree dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7217 grok_method_quals (ctype, dummy, quals);
7218 type = TREE_TYPE (dummy);
7223 switch (TREE_CODE (declarator))
7227 /* We encode a declarator with embedded attributes using
7229 tree attrs = TREE_PURPOSE (declarator);
7233 declarator = TREE_VALUE (declarator);
7234 inner_decl = declarator;
7235 while (inner_decl != NULL_TREE
7236 && TREE_CODE (inner_decl) == TREE_LIST)
7237 inner_decl = TREE_VALUE (inner_decl);
7239 if (inner_decl == NULL_TREE
7240 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
7241 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7242 if (TREE_CODE (inner_decl) == CALL_EXPR)
7243 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7244 if (TREE_CODE (inner_decl) == ARRAY_REF)
7245 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7246 returned_attrs = decl_attributes (&type,
7247 chainon (returned_attrs, attrs),
7254 tree size = TREE_OPERAND (declarator, 1);
7255 declarator = TREE_OPERAND (declarator, 0);
7257 type = create_array_type_for_decl (dname, type, size);
7267 tree inner_parms = CALL_DECLARATOR_PARMS (declarator);
7268 tree inner_decl = TREE_OPERAND (declarator, 0);
7270 /* Declaring a function type.
7271 Make sure we have a valid type for the function to return. */
7273 /* We now know that the TYPE_QUALS don't apply to the
7274 decl, but to its return type. */
7275 type_quals = TYPE_UNQUALIFIED;
7277 /* Warn about some types functions can't return. */
7279 if (TREE_CODE (type) == FUNCTION_TYPE)
7281 error ("`%s' declared as function returning a function", name);
7282 type = integer_type_node;
7284 if (TREE_CODE (type) == ARRAY_TYPE)
7286 error ("`%s' declared as function returning an array", name);
7287 type = integer_type_node;
7290 if (inner_decl && TREE_CODE (inner_decl) == SCOPE_REF)
7291 inner_decl = TREE_OPERAND (inner_decl, 1);
7293 if (inner_decl && TREE_CODE (inner_decl) == TEMPLATE_ID_EXPR)
7296 /* Pick up type qualifiers which should be applied to `this'. */
7297 quals = CALL_DECLARATOR_QUALS (declarator);
7299 /* Pick up the exception specifications. */
7300 raises = CALL_DECLARATOR_EXCEPTION_SPEC (declarator);
7302 /* Say it's a definition only for the CALL_EXPR
7303 closest to the identifier. */
7306 && (TREE_CODE (inner_decl) == IDENTIFIER_NODE
7307 || TREE_CODE (inner_decl) == TEMPLATE_ID_EXPR
7308 || TREE_CODE (inner_decl) == BIT_NOT_EXPR);
7310 if (ctype == NULL_TREE
7311 && decl_context == FIELD
7313 && (friendp == 0 || dname == current_class_name))
7314 ctype = current_class_type;
7316 if (ctype && sfk == sfk_conversion)
7317 TYPE_HAS_CONVERSION (ctype) = 1;
7318 if (ctype && constructor_name_p (dname, ctype))
7320 /* We are within a class's scope. If our declarator name
7321 is the same as the class name, and we are defining
7322 a function, then it is a constructor/destructor, and
7323 therefore returns a void type. */
7325 if (flags == DTOR_FLAG)
7327 /* ISO C++ 12.4/2. A destructor may not be
7328 declared const or volatile. A destructor may
7331 error ("destructor cannot be static member function");
7334 error ("destructors may not be `%s'",
7335 IDENTIFIER_POINTER (TREE_VALUE (quals)));
7338 if (decl_context == FIELD)
7340 if (! member_function_or_else (ctype,
7343 return void_type_node;
7346 else /* It's a constructor. */
7350 /* ISO C++ 12.1. A constructor may not be
7351 declared const or volatile. A constructor may
7352 not be virtual. A constructor may not be
7355 error ("constructor cannot be static member function");
7358 pedwarn ("constructors cannot be declared virtual");
7363 error ("constructors may not be `%s'",
7364 IDENTIFIER_POINTER (TREE_VALUE (quals)));
7368 RID_BIT_TYPE tmp_bits;
7369 memcpy (&tmp_bits, &specbits, sizeof (RID_BIT_TYPE));
7370 RIDBIT_RESET (RID_INLINE, tmp_bits);
7371 RIDBIT_RESET (RID_STATIC, tmp_bits);
7372 if (RIDBIT_ANY_SET (tmp_bits))
7373 error ("return value type specifier for constructor ignored");
7375 if (decl_context == FIELD)
7377 if (! member_function_or_else (ctype,
7380 return void_type_node;
7381 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7382 if (sfk != sfk_constructor)
7386 if (decl_context == FIELD)
7392 error ("can't initialize friend function `%s'", name);
7395 /* Cannot be both friend and virtual. */
7396 error ("virtual functions cannot be friends");
7397 RIDBIT_RESET (RID_FRIEND, specbits);
7400 if (decl_context == NORMAL)
7401 error ("friend declaration not in class definition");
7402 if (current_function_decl && funcdef_flag)
7403 error ("can't define friend function `%s' in a local class definition",
7407 /* Construct the function type and go to the next
7408 inner layer of declarator. */
7410 declarator = TREE_OPERAND (declarator, 0);
7412 arg_types = grokparms (inner_parms);
7414 if (declarator && flags == DTOR_FLAG)
7416 /* A destructor declared in the body of a class will
7417 be represented as a BIT_NOT_EXPR. But, we just
7418 want the underlying IDENTIFIER. */
7419 if (TREE_CODE (declarator) == BIT_NOT_EXPR)
7420 declarator = TREE_OPERAND (declarator, 0);
7422 if (arg_types != void_list_node)
7424 error ("destructors may not have parameters");
7425 arg_types = void_list_node;
7426 last_function_parms = NULL_TREE;
7430 /* ANSI says that `const int foo ();'
7431 does not make the function foo const. */
7432 type = build_function_type (type, arg_types);
7438 /* Filter out pointers-to-references and references-to-references.
7439 We can get these if a TYPE_DECL is used. */
7441 if (TREE_CODE (type) == REFERENCE_TYPE)
7443 error (TREE_CODE (declarator) == ADDR_EXPR
7444 ? "cannot declare reference to `%#T'"
7445 : "cannot declare pointer to `%#T'", type);
7446 type = TREE_TYPE (type);
7448 else if (VOID_TYPE_P (type)
7449 && (ctype || TREE_CODE (declarator) == ADDR_EXPR))
7450 error (ctype ? "cannot declare pointer to `%#T' member"
7451 : "cannot declare reference to `%#T'", type);
7453 /* Merge any constancy or volatility into the target type
7456 /* We now know that the TYPE_QUALS don't apply to the decl,
7457 but to the target of the pointer. */
7458 type_quals = TYPE_UNQUALIFIED;
7460 if (TREE_CODE (declarator) == ADDR_EXPR)
7462 if (!VOID_TYPE_P (type))
7463 type = build_reference_type (type);
7465 else if (TREE_CODE (type) == METHOD_TYPE)
7466 type = build_ptrmemfunc_type (build_pointer_type (type));
7468 type = build_ptrmem_type (ctype, type);
7470 type = build_pointer_type (type);
7472 /* Process a list of type modifier keywords (such as
7473 const or volatile) that were given inside the `*' or `&'. */
7475 if (TREE_TYPE (declarator))
7483 for (typemodlist = TREE_TYPE (declarator); typemodlist;
7484 typemodlist = TREE_CHAIN (typemodlist))
7486 tree qualifier = TREE_VALUE (typemodlist);
7488 if (qualifier == ridpointers[(int) RID_CONST])
7491 type_quals |= TYPE_QUAL_CONST;
7493 else if (qualifier == ridpointers[(int) RID_VOLATILE])
7496 type_quals |= TYPE_QUAL_VOLATILE;
7498 else if (qualifier == ridpointers[(int) RID_RESTRICT])
7501 type_quals |= TYPE_QUAL_RESTRICT;
7506 error ("invalid type modifier within pointer declarator");
7510 pedwarn ("duplicate `const'");
7512 pedwarn ("duplicate `volatile'");
7514 pedwarn ("duplicate `restrict'");
7515 type = cp_build_qualified_type (type, type_quals);
7516 type_quals = cp_type_quals (type);
7518 declarator = TREE_OPERAND (declarator, 0);
7524 /* We have converted type names to NULL_TREE if the
7525 name was bogus, or to a _TYPE node, if not.
7527 The variable CTYPE holds the type we will ultimately
7528 resolve to. The code here just needs to build
7529 up appropriate member types. */
7530 tree sname = TREE_OPERAND (declarator, 1);
7533 /* Destructors can have their visibilities changed as well. */
7534 if (TREE_CODE (sname) == BIT_NOT_EXPR)
7535 sname = TREE_OPERAND (sname, 0);
7537 if (TREE_OPERAND (declarator, 0) == NULL_TREE)
7539 /* We had a reference to a global decl, or
7540 perhaps we were given a non-aggregate typedef,
7541 in which case we cleared this out, and should just
7542 keep going as though it wasn't there. */
7546 ctype = TREE_OPERAND (declarator, 0);
7549 while (t != NULL_TREE && CLASS_TYPE_P (t))
7551 /* You're supposed to have one `template <...>'
7552 for every template class, but you don't need one
7553 for a full specialization. For example:
7555 template <class T> struct S{};
7556 template <> struct S<int> { void f(); };
7557 void S<int>::f () {}
7559 is correct; there shouldn't be a `template <>' for
7560 the definition of `S<int>::f'. */
7561 if (CLASSTYPE_TEMPLATE_INFO (t)
7562 && (CLASSTYPE_TEMPLATE_INSTANTIATION (t)
7563 || uses_template_parms (CLASSTYPE_TI_ARGS (t)))
7564 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7565 template_count += 1;
7567 t = TYPE_MAIN_DECL (t);
7568 t = DECL_CONTEXT (t);
7571 if (sname == NULL_TREE)
7574 if (TREE_CODE (sname) == IDENTIFIER_NODE)
7576 /* This is the `standard' use of the scoping operator:
7577 basetype :: member . */
7579 if (ctype == current_class_type)
7585 Is this ill-formed? */
7588 pedwarn ("extra qualification `%T::' on member `%s' ignored",
7591 else if (TREE_CODE (type) == FUNCTION_TYPE)
7593 if (current_class_type == NULL_TREE || friendp)
7595 = build_method_type_directly (ctype,
7597 TYPE_ARG_TYPES (type));
7600 error ("cannot declare member function `%T::%s' within `%T'",
7601 ctype, name, current_class_type);
7602 return error_mark_node;
7605 else if (RIDBIT_SETP (RID_TYPEDEF, specbits)
7606 || COMPLETE_TYPE_P (complete_type (ctype)))
7608 /* Have to move this code elsewhere in this function.
7609 this code is used for i.e., typedef int A::M; M *pm;
7611 It is? How? jason 10/2/94 */
7613 if (current_class_type)
7615 error ("cannot declare member `%T::%s' within `%T'",
7616 ctype, name, current_class_type);
7617 return void_type_node;
7622 cxx_incomplete_type_error (NULL_TREE, ctype);
7623 return error_mark_node;
7628 else if (TREE_CODE (sname) == SCOPE_REF)
7633 declarator = TREE_OPERAND (declarator, 1);
7634 if (declarator && TREE_CODE (declarator) == CALL_EXPR)
7635 /* In this case, we will deal with it later. */
7637 else if (TREE_CODE (type) == FUNCTION_TYPE)
7638 type = build_method_type_directly (ctype,
7640 TYPE_ARG_TYPES (type));
7646 declarator = TREE_OPERAND (declarator, 0);
7650 declarator = BASELINK_FUNCTIONS (declarator);
7656 declarator = NULL_TREE;
7660 declarator = NULL_TREE;
7671 *attrlist = chainon (returned_attrs, *attrlist);
7673 attrlist = &returned_attrs;
7676 /* Now TYPE has the actual type. */
7678 /* Did array size calculations overflow? */
7680 if (TREE_CODE (type) == ARRAY_TYPE
7681 && COMPLETE_TYPE_P (type)
7682 && TREE_OVERFLOW (TYPE_SIZE (type)))
7684 error ("size of array `%s' is too large", name);
7685 /* If we proceed with the array type as it is, we'll eventually
7686 crash in tree_low_cst(). */
7687 type = error_mark_node;
7690 if ((decl_context == FIELD || decl_context == PARM)
7691 && !processing_template_decl
7692 && variably_modified_type_p (type))
7694 if (decl_context == FIELD)
7695 error ("data member may not have variably modified type `%T'", type);
7697 error ("parameter may not have variably modified type `%T'", type);
7698 type = error_mark_node;
7701 if (explicitp == 1 || (explicitp && friendp))
7703 /* [dcl.fct.spec] The explicit specifier shall only be used in
7704 declarations of constructors within a class definition. */
7705 error ("only declarations of constructors can be `explicit'");
7709 if (RIDBIT_SETP (RID_MUTABLE, specbits))
7711 if (decl_context != FIELD || friendp)
7713 error ("non-member `%s' cannot be declared `mutable'", name);
7714 RIDBIT_RESET (RID_MUTABLE, specbits);
7716 else if (decl_context == TYPENAME || RIDBIT_SETP (RID_TYPEDEF, specbits))
7718 error ("non-object member `%s' cannot be declared `mutable'", name);
7719 RIDBIT_RESET (RID_MUTABLE, specbits);
7721 else if (TREE_CODE (type) == FUNCTION_TYPE
7722 || TREE_CODE (type) == METHOD_TYPE)
7724 error ("function `%s' cannot be declared `mutable'", name);
7725 RIDBIT_RESET (RID_MUTABLE, specbits);
7729 error ("static `%s' cannot be declared `mutable'", name);
7730 RIDBIT_RESET (RID_MUTABLE, specbits);
7732 else if (type_quals & TYPE_QUAL_CONST)
7734 error ("const `%s' cannot be declared `mutable'", name);
7735 RIDBIT_RESET (RID_MUTABLE, specbits);
7739 if (declarator == NULL_TREE
7740 || TREE_CODE (declarator) == IDENTIFIER_NODE
7741 || (TREE_CODE (declarator) == TEMPLATE_ID_EXPR
7742 && (TREE_CODE (type) == FUNCTION_TYPE
7743 || TREE_CODE (type) == METHOD_TYPE)))
7745 else if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
7747 error ("template-id `%D' used as a declarator", declarator);
7751 /* Unexpected declarator format. */
7754 /* If this is declaring a typedef name, return a TYPE_DECL. */
7756 if (RIDBIT_SETP (RID_TYPEDEF, specbits) && decl_context != TYPENAME)
7760 /* Note that the grammar rejects storage classes
7761 in typenames, fields or parameters. */
7762 if (current_lang_name == lang_name_java)
7763 TYPE_FOR_JAVA (type) = 1;
7765 if (decl_context == FIELD)
7767 if (constructor_name_p (declarator, current_class_type))
7768 pedwarn ("ISO C++ forbids nested type `%D' with same name as enclosing class",
7770 decl = build_lang_decl (TYPE_DECL, declarator, type);
7774 decl = build_decl (TYPE_DECL, declarator, type);
7775 if (in_namespace || ctype)
7776 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7777 if (!current_function_decl)
7778 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7781 /* If the user declares "typedef struct {...} foo" then the
7782 struct will have an anonymous name. Fill that name in now.
7783 Nothing can refer to it, so nothing needs know about the name
7785 if (type != error_mark_node
7788 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7789 && TYPE_ANONYMOUS_P (type)
7790 /* Don't do this if there are attributes. */
7791 && (!attrlist || !*attrlist)
7792 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7794 tree oldname = TYPE_NAME (type);
7797 /* Replace the anonymous name with the real name everywhere. */
7798 lookup_tag_reverse (type, declarator);
7799 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7800 if (TYPE_NAME (t) == oldname)
7801 TYPE_NAME (t) = decl;
7803 if (TYPE_LANG_SPECIFIC (type))
7804 TYPE_WAS_ANONYMOUS (type) = 1;
7806 /* If this is a typedef within a template class, the nested
7807 type is a (non-primary) template. The name for the
7808 template needs updating as well. */
7809 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7810 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7811 = TYPE_IDENTIFIER (type);
7813 /* FIXME remangle member functions; member functions of a
7814 type with external linkage have external linkage. */
7819 if (ctype == NULL_TREE)
7821 if (TREE_CODE (type) != METHOD_TYPE)
7822 error ("%Jinvalid type qualifier for non-member function type",
7825 ctype = TYPE_METHOD_BASETYPE (type);
7827 if (ctype != NULL_TREE)
7828 grok_method_quals (ctype, decl, quals);
7831 if (RIDBIT_SETP (RID_SIGNED, specbits)
7832 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7833 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7835 bad_specifiers (decl, "type", virtualp, quals != NULL_TREE,
7836 inlinep, friendp, raises != NULL_TREE);
7841 /* Detect the case of an array type of unspecified size
7842 which came, as such, direct from a typedef name.
7843 We must copy the type, so that the array's domain can be
7844 individually set by the object's initializer. */
7846 if (type && typedef_type
7847 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7848 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7849 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7851 /* Detect where we're using a typedef of function type to declare a
7852 function. last_function_parms will not be set, so we must create
7855 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7857 tree decls = NULL_TREE;
7860 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7862 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7864 TREE_CHAIN (decl) = decls;
7868 last_function_parms = nreverse (decls);
7871 /* If this is a type name (such as, in a cast or sizeof),
7872 compute the type and return it now. */
7874 if (decl_context == TYPENAME)
7876 /* Note that the grammar rejects storage classes
7877 in typenames, fields or parameters. */
7878 if (type_quals != TYPE_UNQUALIFIED)
7879 type_quals = TYPE_UNQUALIFIED;
7881 /* Special case: "friend class foo" looks like a TYPENAME context. */
7884 if (type_quals != TYPE_UNQUALIFIED)
7886 error ("type qualifiers specified for friend class declaration");
7887 type_quals = TYPE_UNQUALIFIED;
7891 error ("`inline' specified for friend class declaration");
7897 /* Don't allow friend declaration without a class-key. */
7898 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7899 pedwarn ("template parameters cannot be friends");
7900 else if (TREE_CODE (type) == TYPENAME_TYPE)
7901 pedwarn ("friend declaration requires class-key, "
7902 "i.e. `friend class %T::%D'",
7903 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7905 pedwarn ("friend declaration requires class-key, "
7906 "i.e. `friend %#T'",
7910 /* Only try to do this stuff if we didn't already give up. */
7911 if (type != integer_type_node)
7913 /* A friendly class? */
7914 if (current_class_type)
7915 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7918 error ("trying to make class `%T' a friend of global scope",
7921 type = void_type_node;
7926 if (ctype == NULL_TREE)
7928 if (TREE_CODE (type) != METHOD_TYPE)
7929 error ("invalid qualifiers on non-member function type");
7931 ctype = TYPE_METHOD_BASETYPE (type);
7935 tree dummy = build_decl (TYPE_DECL, declarator, type);
7936 grok_method_quals (ctype, dummy, quals);
7937 type = TREE_TYPE (dummy);
7943 else if (declarator == NULL_TREE && decl_context != PARM
7944 && decl_context != CATCHPARM
7945 && TREE_CODE (type) != UNION_TYPE
7948 error ("abstract declarator `%T' used as declaration", type);
7949 declarator = make_anon_name ();
7952 /* `void' at top level (not within pointer)
7953 is allowed only in typedefs or type names.
7954 We don't complain about parms either, but that is because
7955 a better error message can be made later. */
7957 if (TREE_CODE (type) == VOID_TYPE && decl_context != PARM)
7960 error ("unnamed variable or field declared void");
7961 else if (TREE_CODE (declarator) == IDENTIFIER_NODE)
7963 if (IDENTIFIER_OPNAME_P (declarator))
7966 error ("variable or field `%s' declared void", name);
7969 error ("variable or field declared void");
7970 type = integer_type_node;
7973 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7974 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7976 if (decl_context == PARM || decl_context == CATCHPARM)
7978 if (ctype || in_namespace)
7979 error ("cannot use `::' in parameter declaration");
7981 /* A parameter declared as an array of T is really a pointer to T.
7982 One declared as a function is really a pointer to a function.
7983 One declared as a member is really a pointer to member. */
7985 if (TREE_CODE (type) == ARRAY_TYPE)
7987 /* Transfer const-ness of array into that of type pointed to. */
7988 type = build_pointer_type (TREE_TYPE (type));
7989 type_quals = TYPE_UNQUALIFIED;
7991 else if (TREE_CODE (type) == FUNCTION_TYPE)
7992 type = build_pointer_type (type);
7998 if (decl_context == PARM)
8000 decl = cp_build_parm_decl (declarator, type);
8002 bad_specifiers (decl, "parameter", virtualp, quals != NULL_TREE,
8003 inlinep, friendp, raises != NULL_TREE);
8005 else if (decl_context == FIELD)
8007 /* The C99 flexible array extension. */
8008 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8009 && TYPE_DOMAIN (type) == NULL_TREE)
8011 tree itype = compute_array_index_type (dname, integer_zero_node);
8012 type = build_cplus_array_type (TREE_TYPE (type), itype);
8015 if (type == error_mark_node)
8017 /* Happens when declaring arrays of sizes which
8018 are error_mark_node, for example. */
8021 else if (in_namespace && !friendp)
8023 /* Something like struct S { int N::j; }; */
8024 error ("invalid use of `::'");
8027 else if (TREE_CODE (type) == FUNCTION_TYPE)
8030 tree function_context;
8032 /* We catch the others as conflicts with the builtin
8034 if (friendp && declarator == ridpointers[(int) RID_SIGNED])
8036 error ("function `%D' cannot be declared friend",
8043 if (ctype == NULL_TREE)
8044 ctype = current_class_type;
8046 if (ctype == NULL_TREE)
8048 error ("can't make `%D' into a method -- not in a class",
8050 return void_type_node;
8053 /* ``A union may [ ... ] not [ have ] virtual functions.''
8055 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8057 error ("function `%D' declared virtual inside a union",
8059 return void_type_node;
8062 if (declarator == ansi_opname (NEW_EXPR)
8063 || declarator == ansi_opname (VEC_NEW_EXPR)
8064 || declarator == ansi_opname (DELETE_EXPR)
8065 || declarator == ansi_opname (VEC_DELETE_EXPR))
8069 error ("`%D' cannot be declared virtual, since it is always static",
8074 else if (staticp < 2)
8075 type = build_method_type_directly (ctype,
8077 TYPE_ARG_TYPES (type));
8080 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8081 function_context = (ctype != NULL_TREE) ?
8082 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8083 publicp = (! friendp || ! staticp)
8084 && function_context == NULL_TREE;
8085 decl = grokfndecl (ctype, type,
8086 TREE_CODE (declarator) != TEMPLATE_ID_EXPR
8087 ? declarator : dname,
8089 virtualp, flags, quals, raises,
8090 friendp ? -1 : 0, friendp, publicp, inlinep,
8091 funcdef_flag, template_count, in_namespace);
8092 if (decl == NULL_TREE)
8095 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8096 /* The decl and setting of decl_attr is also turned off. */
8097 decl = build_decl_attribute_variant (decl, decl_attr);
8100 /* [class.conv.ctor]
8102 A constructor declared without the function-specifier
8103 explicit that can be called with a single parameter
8104 specifies a conversion from the type of its first
8105 parameter to the type of its class. Such a constructor
8106 is called a converting constructor. */
8108 DECL_NONCONVERTING_P (decl) = 1;
8109 else if (DECL_CONSTRUCTOR_P (decl))
8111 /* The constructor can be called with exactly one
8112 parameter if there is at least one parameter, and
8113 any subsequent parameters have default arguments.
8114 Ignore any compiler-added parms. */
8115 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8117 if (arg_types == void_list_node
8119 && TREE_CHAIN (arg_types)
8120 && TREE_CHAIN (arg_types) != void_list_node
8121 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8122 DECL_NONCONVERTING_P (decl) = 1;
8125 else if (TREE_CODE (type) == METHOD_TYPE)
8127 /* We only get here for friend declarations of
8128 members of other classes. */
8129 /* All method decls are public, so tell grokfndecl to set
8130 TREE_PUBLIC, also. */
8131 decl = grokfndecl (ctype, type,
8132 TREE_CODE (declarator) != TEMPLATE_ID_EXPR
8133 ? declarator : dname,
8135 virtualp, flags, quals, raises,
8136 friendp ? -1 : 0, friendp, 1, 0, funcdef_flag,
8137 template_count, in_namespace);
8138 if (decl == NULL_TREE)
8141 else if (!staticp && ! processing_template_decl
8142 && !COMPLETE_TYPE_P (complete_type (type))
8143 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8146 error ("field `%D' has incomplete type", declarator);
8148 error ("name `%T' has incomplete type", type);
8150 /* If we're instantiating a template, tell them which
8151 instantiation made the field's type be incomplete. */
8152 if (current_class_type
8153 && TYPE_NAME (current_class_type)
8154 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8155 && declspecs && TREE_VALUE (declspecs)
8156 && TREE_TYPE (TREE_VALUE (declspecs)) == type)
8157 error (" in instantiation of template `%T'",
8158 current_class_type);
8160 type = error_mark_node;
8167 error ("`%s' is neither function nor member function; cannot be declared friend",
8168 IDENTIFIER_POINTER (declarator));
8176 /* Friends are treated specially. */
8177 if (ctype == current_class_type)
8178 warning ("member functions are implicitly friends of their class");
8179 else if (decl && DECL_NAME (decl))
8181 if (template_class_depth (current_class_type) == 0)
8183 decl = check_explicit_specialization
8184 (declarator, decl, template_count,
8185 2 * (funcdef_flag != 0) + 4);
8186 if (decl == error_mark_node)
8187 return error_mark_node;
8190 decl = do_friend (ctype, declarator, decl,
8191 last_function_parms, *attrlist,
8192 flags, quals, funcdef_flag);
8196 return void_type_node;
8199 /* Structure field. It may not be a function, except for C++. */
8201 if (decl == NULL_TREE)
8207 /* An attempt is being made to initialize a non-static
8208 member. But, from [class.mem]:
8210 4 A member-declarator can contain a
8211 constant-initializer only if it declares a static
8212 member (_class.static_) of integral or enumeration
8213 type, see _class.static.data_.
8215 This used to be relatively common practice, but
8216 the rest of the compiler does not correctly
8217 handle the initialization unless the member is
8218 static so we make it static below. */
8219 pedwarn ("ISO C++ forbids initialization of member `%D'",
8221 pedwarn ("making `%D' static", declarator);
8225 if (uses_template_parms (type))
8226 /* We'll check at instantiation time. */
8228 else if (check_static_variable_definition (declarator,
8230 /* If we just return the declaration, crashes
8231 will sometimes occur. We therefore return
8232 void_type_node, as if this was a friend
8233 declaration, to cause callers to completely
8234 ignore this declaration. */
8235 return void_type_node;
8240 /* [class.mem] forbids static data members with the
8241 same name as the enclosing class. Non-static data
8242 members are checked in check_field_decls. */
8243 if (constructor_name_p (declarator, current_class_type))
8244 pedwarn ("ISO C++ forbids static data member `%D' with same name as enclosing class",
8247 /* C++ allows static class members. All other work
8248 for this is done by grokfield. */
8249 decl = build_lang_decl (VAR_DECL, declarator, type);
8250 TREE_STATIC (decl) = 1;
8251 /* In class context, 'static' means public access. */
8252 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl) = 1;
8256 decl = build_decl (FIELD_DECL, declarator, type);
8257 DECL_NONADDRESSABLE_P (decl) = bitfield;
8258 if (RIDBIT_SETP (RID_MUTABLE, specbits))
8260 DECL_MUTABLE_P (decl) = 1;
8261 RIDBIT_RESET (RID_MUTABLE, specbits);
8265 bad_specifiers (decl, "field", virtualp, quals != NULL_TREE,
8266 inlinep, friendp, raises != NULL_TREE);
8269 else if (TREE_CODE (type) == FUNCTION_TYPE
8270 || TREE_CODE (type) == METHOD_TYPE)
8278 if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
8279 original_name = dname;
8281 original_name = declarator;
8283 if (RIDBIT_SETP (RID_AUTO, specbits))
8284 error ("storage class `auto' invalid for function `%s'", name);
8285 else if (RIDBIT_SETP (RID_REGISTER, specbits))
8286 error ("storage class `register' invalid for function `%s'", name);
8287 else if (RIDBIT_SETP (RID_THREAD, specbits))
8288 error ("storage class `__thread' invalid for function `%s'", name);
8290 /* Function declaration not at top level.
8291 Storage classes other than `extern' are not allowed
8292 and `extern' makes no difference. */
8293 if (! toplevel_bindings_p ()
8294 && (RIDBIT_SETP (RID_STATIC, specbits)
8295 || RIDBIT_SETP (RID_INLINE, specbits))
8298 if (RIDBIT_SETP (RID_STATIC, specbits))
8299 pedwarn ("storage class `static' invalid for function `%s' declared out of global scope", name);
8301 pedwarn ("storage class `inline' invalid for function `%s' declared out of global scope", name);
8304 if (ctype == NULL_TREE)
8308 error ("virtual non-class function `%s'", name);
8312 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2)
8313 type = build_method_type_directly (ctype,
8315 TYPE_ARG_TYPES (type));
8317 /* Record presence of `static'. */
8318 publicp = (ctype != NULL_TREE
8319 || RIDBIT_SETP (RID_EXTERN, specbits)
8320 || !RIDBIT_SETP (RID_STATIC, specbits));
8322 decl = grokfndecl (ctype, type, original_name, declarator,
8323 virtualp, flags, quals, raises,
8325 publicp, inlinep, funcdef_flag,
8326 template_count, in_namespace);
8327 if (decl == NULL_TREE)
8332 int invalid_static = 0;
8334 /* Don't allow a static member function in a class, and forbid
8335 declaring main to be static. */
8336 if (TREE_CODE (type) == METHOD_TYPE)
8338 pedwarn ("cannot declare member function `%D' to have static linkage", decl);
8341 else if (current_function_decl)
8343 /* FIXME need arm citation */
8344 error ("cannot declare static function inside another function");
8351 RIDBIT_RESET (RID_STATIC, specbits);
8357 /* It's a variable. */
8359 /* An uninitialized decl with `extern' is a reference. */
8360 decl = grokvardecl (type, declarator, &specbits,
8362 (type_quals & TYPE_QUAL_CONST) != 0,
8363 ctype ? ctype : in_namespace);
8364 bad_specifiers (decl, "variable", virtualp, quals != NULL_TREE,
8365 inlinep, friendp, raises != NULL_TREE);
8369 DECL_CONTEXT (decl) = ctype;
8372 pedwarn ("`static' may not be used when defining (as opposed to declaring) a static data member");
8374 RIDBIT_RESET (RID_STATIC, specbits);
8376 if (RIDBIT_SETP (RID_REGISTER, specbits) && TREE_STATIC (decl))
8378 error ("static member `%D' declared `register'", decl);
8379 RIDBIT_RESET (RID_REGISTER, specbits);
8381 if (RIDBIT_SETP (RID_EXTERN, specbits) && pedantic)
8383 pedwarn ("cannot explicitly declare member `%#D' to have extern linkage",
8385 RIDBIT_RESET (RID_EXTERN, specbits);
8390 my_friendly_assert (!RIDBIT_SETP (RID_MUTABLE, specbits), 19990927);
8392 /* Record `register' declaration for warnings on &
8393 and in case doing stupid register allocation. */
8395 if (RIDBIT_SETP (RID_REGISTER, specbits))
8396 DECL_REGISTER (decl) = 1;
8398 if (RIDBIT_SETP (RID_EXTERN, specbits))
8399 DECL_THIS_EXTERN (decl) = 1;
8401 if (RIDBIT_SETP (RID_STATIC, specbits))
8402 DECL_THIS_STATIC (decl) = 1;
8404 /* Record constancy and volatility. There's no need to do this
8405 when processing a template; we'll do this for the instantiated
8406 declaration based on the type of DECL. */
8407 if (!processing_template_decl)
8408 c_apply_type_quals_to_decl (type_quals, decl);
8414 /* Subroutine of start_function. Ensure that each of the parameter
8415 types (as listed in PARMS) is complete, as is required for a
8416 function definition. */
8419 require_complete_types_for_parms (tree parms)
8421 for (; parms; parms = TREE_CHAIN (parms))
8423 if (VOID_TYPE_P (TREE_TYPE (parms)))
8424 /* grokparms will have already issued an error. */
8425 TREE_TYPE (parms) = error_mark_node;
8426 else if (complete_type_or_else (TREE_TYPE (parms), parms))
8428 layout_decl (parms, 0);
8429 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8432 TREE_TYPE (parms) = error_mark_node;
8436 /* Returns nonzero if T is a local variable. */
8439 local_variable_p (tree t)
8441 if ((TREE_CODE (t) == VAR_DECL
8442 /* A VAR_DECL with a context that is a _TYPE is a static data
8444 && !TYPE_P (CP_DECL_CONTEXT (t))
8445 /* Any other non-local variable must be at namespace scope. */
8446 && !DECL_NAMESPACE_SCOPE_P (t))
8447 || (TREE_CODE (t) == PARM_DECL))
8453 /* Returns nonzero if T is an automatic local variable or a label.
8454 (These are the declarations that need to be remapped when the code
8455 containing them is duplicated.) */
8458 nonstatic_local_decl_p (tree t)
8460 return ((local_variable_p (t) && !TREE_STATIC (t))
8461 || TREE_CODE (t) == LABEL_DECL
8462 || TREE_CODE (t) == RESULT_DECL);
8465 /* Like local_variable_p, but suitable for use as a tree-walking
8469 local_variable_p_walkfn (tree* tp,
8470 int* walk_subtrees ATTRIBUTE_UNUSED ,
8471 void* data ATTRIBUTE_UNUSED )
8473 return ((local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8477 /* Check that ARG, which is a default-argument expression for a
8478 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8479 something goes wrong. DECL may also be a _TYPE node, rather than a
8480 DECL, if there is no DECL available. */
8483 check_default_argument (tree decl, tree arg)
8488 if (TREE_CODE (arg) == DEFAULT_ARG)
8489 /* We get a DEFAULT_ARG when looking at an in-class declaration
8490 with a default argument. Ignore the argument for now; we'll
8491 deal with it after the class is complete. */
8494 if (processing_template_decl || uses_template_parms (arg))
8495 /* We don't do anything checking until instantiation-time. Note
8496 that there may be uninstantiated arguments even for an
8497 instantiated function, since default arguments are not
8498 instantiated until they are needed. */
8507 decl_type = TREE_TYPE (decl);
8509 if (arg == error_mark_node
8510 || decl == error_mark_node
8511 || TREE_TYPE (arg) == error_mark_node
8512 || decl_type == error_mark_node)
8513 /* Something already went wrong. There's no need to check
8515 return error_mark_node;
8517 /* [dcl.fct.default]
8519 A default argument expression is implicitly converted to the
8521 if (!TREE_TYPE (arg)
8522 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg))
8525 error ("default argument for `%#D' has type `%T'",
8526 decl, TREE_TYPE (arg));
8528 error ("default argument for parameter of type `%T' has type `%T'",
8529 decl_type, TREE_TYPE (arg));
8531 return error_mark_node;
8534 /* [dcl.fct.default]
8536 Local variables shall not be used in default argument
8539 The keyword `this' shall not be used in a default argument of a
8541 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8545 error ("default argument `%E' uses local variable `%D'",
8547 return error_mark_node;
8554 /* Decode the list of parameter types for a function type.
8555 Given the list of things declared inside the parens,
8556 return a list of types.
8558 We determine whether ellipsis parms are used by PARMLIST_ELLIPSIS_P
8559 flag. If unset, we append void_list_node. A parmlist declared
8560 as `(void)' is accepted as the empty parmlist.
8562 Also set last_function_parms to the chain of PARM_DECLs. */
8565 grokparms (tree first_parm)
8567 tree result = NULL_TREE;
8568 tree decls = NULL_TREE;
8569 int ellipsis = !first_parm || PARMLIST_ELLIPSIS_P (first_parm);
8573 my_friendly_assert (!first_parm || TREE_PARMLIST (first_parm), 20001115);
8575 for (parm = first_parm; parm != NULL_TREE; parm = chain)
8577 tree type = NULL_TREE;
8578 tree decl = TREE_VALUE (parm);
8579 tree init = TREE_PURPOSE (parm);
8582 chain = TREE_CHAIN (parm);
8583 /* @@ weak defense against parse errors. */
8584 if (TREE_CODE (decl) != VOID_TYPE
8585 && TREE_CODE (decl) != TREE_LIST)
8587 /* Give various messages as the need arises. */
8588 if (TREE_CODE (decl) == STRING_CST)
8589 error ("invalid string constant `%E'", decl);
8590 else if (TREE_CODE (decl) == INTEGER_CST)
8591 error ("invalid integer constant in parameter list, did you forget to give parameter name?");
8595 if (parm == void_list_node)
8598 split_specs_attrs (TREE_PURPOSE (decl), &specs, &attrs);
8599 decl = grokdeclarator (TREE_VALUE (decl), specs,
8600 PARM, init != NULL_TREE, &attrs);
8601 if (! decl || TREE_TYPE (decl) == error_mark_node)
8605 cplus_decl_attributes (&decl, attrs, 0);
8607 type = TREE_TYPE (decl);
8608 if (VOID_TYPE_P (type))
8610 if (same_type_p (type, void_type_node)
8611 && !DECL_NAME (decl) && !result && !chain && !ellipsis)
8612 /* this is a parmlist of `(void)', which is ok. */
8614 cxx_incomplete_type_error (decl, type);
8615 /* It's not a good idea to actually create parameters of
8616 type `void'; other parts of the compiler assume that a
8617 void type terminates the parameter list. */
8618 type = error_mark_node;
8619 TREE_TYPE (decl) = error_mark_node;
8622 if (type != error_mark_node)
8624 /* Top-level qualifiers on the parameters are
8625 ignored for function types. */
8626 type = cp_build_qualified_type (type, 0);
8627 if (TREE_CODE (type) == METHOD_TYPE)
8629 error ("parameter `%D' invalidly declared method type", decl);
8630 type = build_pointer_type (type);
8631 TREE_TYPE (decl) = type;
8633 else if (abstract_virtuals_error (decl, type))
8634 any_error = 1; /* Seems like a good idea. */
8635 else if (POINTER_TYPE_P (type))
8637 /* [dcl.fct]/6, parameter types cannot contain pointers
8638 (references) to arrays of unknown bound. */
8639 tree t = TREE_TYPE (type);
8640 int ptr = TYPE_PTR_P (type);
8646 else if (TREE_CODE (t) != ARRAY_TYPE)
8648 else if (!TYPE_DOMAIN (t))
8652 if (TREE_CODE (t) == ARRAY_TYPE)
8653 error ("parameter `%D' includes %s to array of unknown bound `%T'",
8654 decl, ptr ? "pointer" : "reference", t);
8657 if (!any_error && init)
8658 init = check_default_argument (decl, init);
8663 TREE_CHAIN (decl) = decls;
8665 result = tree_cons (init, type, result);
8667 decls = nreverse (decls);
8668 result = nreverse (result);
8670 result = chainon (result, void_list_node);
8671 last_function_parms = decls;
8677 /* D is a constructor or overloaded `operator='.
8679 Let T be the class in which D is declared. Then, this function
8682 -1 if D's is an ill-formed constructor or copy assignment operator
8683 whose first parameter is of type `T'.
8684 0 if D is not a copy constructor or copy assignment
8686 1 if D is a copy constructor or copy assignment operator whose
8687 first parameter is a reference to const qualified T.
8688 2 if D is a copy constructor or copy assignment operator whose
8689 first parameter is a reference to non-const qualified T.
8691 This function can be used as a predicate. Positive values indicate
8692 a copy constructor and nonzero values indicate a copy assignment
8702 my_friendly_assert (DECL_FUNCTION_MEMBER_P (d), 20011208);
8704 if (DECL_TEMPLATE_INFO (d) && is_member_template (DECL_TI_TEMPLATE (d)))
8705 /* Instantiations of template member functions are never copy
8706 functions. Note that member functions of templated classes are
8707 represented as template functions internally, and we must
8708 accept those as copy functions. */
8711 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8715 arg_type = TREE_VALUE (args);
8717 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8719 /* Pass by value copy assignment operator. */
8722 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8723 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8725 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8731 args = TREE_CHAIN (args);
8733 if (args && args != void_list_node && !TREE_PURPOSE (args))
8734 /* There are more non-optional args. */
8740 /* Remember any special properties of member function DECL. */
8742 void grok_special_member_properties (tree decl)
8744 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8745 ; /* Not special. */
8746 else if (DECL_CONSTRUCTOR_P (decl))
8748 int ctor = copy_fn_p (decl);
8754 A non-template constructor for class X is a copy
8755 constructor if its first parameter is of type X&, const
8756 X&, volatile X& or const volatile X&, and either there
8757 are no other parameters or else all other parameters have
8758 default arguments. */
8759 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8761 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8763 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8764 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8766 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8770 A non-template assignment operator for class X is a copy
8771 assignment operator if its parameter is of type X, X&, const
8772 X&, volatile X& or const volatile X&. */
8774 int assop = copy_fn_p (decl);
8778 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8780 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8781 if (DECL_PURE_VIRTUAL_P (decl))
8782 TYPE_HAS_ABSTRACT_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8787 /* Check a constructor DECL has the correct form. Complains
8788 if the class has a constructor of the form X(X). */
8791 grok_ctor_properties (tree ctype, tree decl)
8793 int ctor_parm = copy_fn_p (decl);
8799 A declaration of a constructor for a class X is ill-formed if
8800 its first parameter is of type (optionally cv-qualified) X
8801 and either there are no other parameters or else all other
8802 parameters have default arguments.
8804 We *don't* complain about member template instantiations that
8805 have this form, though; they can occur as we try to decide
8806 what constructor to use during overload resolution. Since
8807 overload resolution will never prefer such a constructor to
8808 the non-template copy constructor (which is either explicitly
8809 or implicitly defined), there's no need to worry about their
8810 existence. Theoretically, they should never even be
8811 instantiated, but that's hard to forestall. */
8812 error ("invalid constructor; you probably meant `%T (const %T&)'",
8814 SET_IDENTIFIER_ERROR_LOCUS (DECL_NAME (decl), ctype);
8821 /* An operator with this code is unary, but can also be binary. */
8824 ambi_op_p (enum tree_code code)
8826 return (code == INDIRECT_REF
8827 || code == ADDR_EXPR
8828 || code == CONVERT_EXPR
8829 || code == NEGATE_EXPR
8830 || code == PREINCREMENT_EXPR
8831 || code == PREDECREMENT_EXPR);
8834 /* An operator with this name can only be unary. */
8837 unary_op_p (enum tree_code code)
8839 return (code == TRUTH_NOT_EXPR
8840 || code == BIT_NOT_EXPR
8841 || code == COMPONENT_REF
8842 || code == TYPE_EXPR);
8845 /* DECL is a declaration for an overloaded operator. Returns true if
8846 the declaration is valid; false otherwise. If COMPLAIN is true,
8847 errors are issued for invalid declarations. */
8850 grok_op_properties (tree decl, int friendp, bool complain)
8852 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8854 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8855 tree name = DECL_NAME (decl);
8856 enum tree_code operator_code;
8860 /* Assume that the declaration is valid. */
8863 /* Count the number of arguments. */
8864 for (argtype = argtypes, arity = 0;
8865 argtype && argtype != void_list_node;
8866 argtype = TREE_CHAIN (argtype))
8869 if (current_class_type == NULL_TREE)
8872 if (DECL_CONV_FN_P (decl))
8873 operator_code = TYPE_EXPR;
8877 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8878 if (ansi_opname (CODE) == name) \
8880 operator_code = (CODE); \
8883 else if (ansi_assopname (CODE) == name) \
8885 operator_code = (CODE); \
8886 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8890 #include "operators.def"
8896 my_friendly_assert (operator_code != LAST_CPLUS_TREE_CODE, 20000526);
8897 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8901 switch (operator_code)
8904 TYPE_HAS_NEW_OPERATOR (current_class_type) = 1;
8908 TYPE_GETS_DELETE (current_class_type) |= 1;
8912 TYPE_HAS_ARRAY_NEW_OPERATOR (current_class_type) = 1;
8915 case VEC_DELETE_EXPR:
8916 TYPE_GETS_DELETE (current_class_type) |= 2;
8924 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8926 /* When the compiler encounters the definition of A::operator new, it
8927 doesn't look at the class declaration to find out if it's static. */
8929 revert_static_member_fn (decl);
8931 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8933 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8936 revert_static_member_fn (decl);
8938 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8942 /* An operator function must either be a non-static member function
8943 or have at least one parameter of a class, a reference to a class,
8944 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8945 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8947 if (operator_code == TYPE_EXPR
8948 || operator_code == CALL_EXPR
8949 || operator_code == COMPONENT_REF
8950 || operator_code == ARRAY_REF
8951 || operator_code == NOP_EXPR)
8952 error ("`%D' must be a nonstatic member function", decl);
8957 if (DECL_STATIC_FUNCTION_P (decl))
8958 error ("`%D' must be either a non-static member function or a non-member function", decl);
8960 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8962 tree arg = non_reference (TREE_VALUE (p));
8963 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8964 because these checks are performed even on
8965 template functions. */
8966 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8970 if (!p || p == void_list_node)
8975 error ("`%D' must have an argument of class or "
8983 /* There are no restrictions on the arguments to an overloaded
8985 if (operator_code == CALL_EXPR)
8988 if (IDENTIFIER_TYPENAME_P (name) && ! DECL_TEMPLATE_INFO (decl))
8990 tree t = TREE_TYPE (name);
8993 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8994 const char *what = 0;
8997 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8999 if (TREE_CODE (t) == VOID_TYPE)
9001 else if (t == current_class_type)
9002 what = "the same type";
9003 /* Don't force t to be complete here. */
9004 else if (IS_AGGR_TYPE (t)
9005 && COMPLETE_TYPE_P (t)
9006 && DERIVED_FROM_P (t, current_class_type))
9007 what = "a base class";
9009 if (what && warn_conversion)
9010 warning ("conversion to %s%s will never use a type conversion operator",
9011 ref ? "a reference to " : "", what);
9014 if (operator_code == COND_EXPR)
9017 error ("ISO C++ prohibits overloading operator ?:");
9019 else if (ambi_op_p (operator_code))
9022 /* We pick the one-argument operator codes by default, so
9023 we don't have to change anything. */
9025 else if (arity == 2)
9027 /* If we thought this was a unary operator, we now know
9028 it to be a binary operator. */
9029 switch (operator_code)
9032 operator_code = MULT_EXPR;
9036 operator_code = BIT_AND_EXPR;
9040 operator_code = PLUS_EXPR;
9044 operator_code = MINUS_EXPR;
9047 case PREINCREMENT_EXPR:
9048 operator_code = POSTINCREMENT_EXPR;
9051 case PREDECREMENT_EXPR:
9052 operator_code = POSTDECREMENT_EXPR;
9059 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9061 if ((operator_code == POSTINCREMENT_EXPR
9062 || operator_code == POSTDECREMENT_EXPR)
9063 && ! processing_template_decl
9064 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9067 error ("postfix `%D' must take `int' as its argument",
9071 ("postfix `%D' must take `int' as its second argument",
9078 error ("`%D' must take either zero or one argument", decl);
9080 error ("`%D' must take either one or two arguments", decl);
9083 /* More Effective C++ rule 6. */
9085 && (operator_code == POSTINCREMENT_EXPR
9086 || operator_code == POSTDECREMENT_EXPR
9087 || operator_code == PREINCREMENT_EXPR
9088 || operator_code == PREDECREMENT_EXPR))
9090 tree arg = TREE_VALUE (argtypes);
9091 tree ret = TREE_TYPE (TREE_TYPE (decl));
9092 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9093 arg = TREE_TYPE (arg);
9094 arg = TYPE_MAIN_VARIANT (arg);
9095 if (operator_code == PREINCREMENT_EXPR
9096 || operator_code == PREDECREMENT_EXPR)
9098 if (TREE_CODE (ret) != REFERENCE_TYPE
9099 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9101 warning ("prefix `%D' should return `%T'", decl,
9102 build_reference_type (arg));
9106 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9107 warning ("postfix `%D' should return `%T'", decl, arg);
9111 else if (unary_op_p (operator_code))
9116 error ("`%D' must take `void'", decl);
9118 error ("`%D' must take exactly one argument", decl);
9121 else /* if (binary_op_p (operator_code)) */
9126 error ("`%D' must take exactly one argument", decl);
9128 error ("`%D' must take exactly two arguments", decl);
9131 /* More Effective C++ rule 7. */
9133 && (operator_code == TRUTH_ANDIF_EXPR
9134 || operator_code == TRUTH_ORIF_EXPR
9135 || operator_code == COMPOUND_EXPR))
9136 warning ("user-defined `%D' always evaluates both arguments",
9140 /* Effective C++ rule 23. */
9143 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9144 && (operator_code == PLUS_EXPR
9145 || operator_code == MINUS_EXPR
9146 || operator_code == TRUNC_DIV_EXPR
9147 || operator_code == MULT_EXPR
9148 || operator_code == TRUNC_MOD_EXPR)
9149 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9150 warning ("`%D' should return by value", decl);
9153 for (; argtypes && argtypes != void_list_node;
9154 argtypes = TREE_CHAIN (argtypes))
9155 if (TREE_PURPOSE (argtypes))
9157 TREE_PURPOSE (argtypes) = NULL_TREE;
9158 if (operator_code == POSTINCREMENT_EXPR
9159 || operator_code == POSTDECREMENT_EXPR)
9162 pedwarn ("`%D' cannot have default arguments", decl);
9165 error ("`%D' cannot have default arguments", decl);
9174 tag_name (enum tag_types code)
9191 /* Name lookup in an elaborated-type-specifier (after the keyword
9192 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9193 elaborated-type-specifier is invalid, issue a diagnostic and return
9194 error_mark_node; otherwise, return the *_TYPE to which it referred.
9195 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9198 check_elaborated_type_specifier (enum tag_types tag_code,
9200 bool allow_template_p)
9206 struct S { struct S *p; };
9208 name lookup will find the TYPE_DECL for the implicit "S::S"
9209 typedef. Adjust for that here. */
9210 if (DECL_SELF_REFERENCE_P (decl))
9211 decl = TYPE_NAME (TREE_TYPE (decl));
9213 type = TREE_TYPE (decl);
9217 If the identifier resolves to a typedef-name or a template
9218 type-parameter, the elaborated-type-specifier is ill-formed.
9220 In other words, the only legitimate declaration to use in the
9221 elaborated type specifier is the implicit typedef created when
9222 the type is declared. */
9223 if (!DECL_IMPLICIT_TYPEDEF_P (decl))
9225 error ("using typedef-name `%D' after `%s'", decl, tag_name (tag_code));
9226 return IS_AGGR_TYPE (type) ? type : error_mark_node;
9229 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9231 error ("using template type parameter `%T' after `%s'",
9232 type, tag_name (tag_code));
9233 return error_mark_node;
9235 else if (TREE_CODE (type) != RECORD_TYPE
9236 && TREE_CODE (type) != UNION_TYPE
9237 && tag_code != enum_type)
9239 error ("`%T' referred to as `%s'", type, tag_name (tag_code));
9240 return error_mark_node;
9242 else if (TREE_CODE (type) != ENUMERAL_TYPE
9243 && tag_code == enum_type)
9245 error ("`%T' referred to as enum", type);
9246 return error_mark_node;
9248 else if (!allow_template_p
9249 && TREE_CODE (type) == RECORD_TYPE
9250 && CLASSTYPE_IS_TEMPLATE (type))
9252 /* If a class template appears as elaborated type specifier
9253 without a template header such as:
9255 template <class T> class C {};
9256 void f(class C); // No template header here
9258 then the required template argument is missing. */
9260 error ("template argument required for `%s %T'",
9261 tag_name (tag_code),
9262 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9263 return error_mark_node;
9269 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9270 Define the tag as a forward-reference if it is not defined.
9272 If a declaration is given, process it here, and report an error if
9273 multiple declarations are not identical. ATTRIBUTE is the attribute
9274 appeared in this declaration.
9276 GLOBALIZE is false when this is also a definition. Only look in
9277 the current frame for the name (since C++ allows new names in any
9280 TEMPLATE_HEADER_P is true when this declaration is preceded by
9281 a set of template parameters. */
9284 xref_tag (enum tag_types tag_code, tree name, tree attributes,
9285 bool globalize, bool template_header_p)
9287 enum tree_code code;
9289 struct cp_binding_level *b = current_binding_level;
9290 tree context = NULL_TREE;
9292 timevar_push (TV_NAME_LOOKUP);
9294 my_friendly_assert (TREE_CODE (name) == IDENTIFIER_NODE, 0);
9306 code = ENUMERAL_TYPE;
9314 /* If we know we are defining this tag, only look it up in
9315 this scope and don't try to find it as a type. */
9316 t = lookup_tag (code, name, b, 1);
9320 tree decl = lookup_name (name, 1);
9322 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9323 decl = DECL_TEMPLATE_RESULT (decl);
9325 if (decl && TREE_CODE (decl) == TYPE_DECL)
9327 /* Two cases we need to consider when deciding if a class
9328 template is allowed as an elaborated type specifier:
9329 1. It is a self reference to its own class.
9330 2. It comes with a template header.
9334 template <class T> class C {
9335 class C *c1; // DECL_SELF_REFERENCE_P is true
9338 template <class U> class C; // template_header_p is true
9339 template <class T> class C<T>::D {
9340 class C *c2; // DECL_SELF_REFERENCE_P is true
9343 t = check_elaborated_type_specifier (tag_code,
9346 | DECL_SELF_REFERENCE_P (decl));
9347 if (t == error_mark_node)
9348 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9353 if (t && current_class_type
9354 && template_class_depth (current_class_type)
9355 && template_header_p)
9357 /* Since GLOBALIZE is nonzero, we are not looking at a
9358 definition of this tag. Since, in addition, we are currently
9359 processing a (member) template declaration of a template
9360 class, we must be very careful; consider:
9367 { template <class V>
9368 friend struct S1; };
9370 Here, the S2::S1 declaration should not be confused with the
9371 outer declaration. In particular, the inner version should
9372 have a template parameter of level 2, not level 1. This
9373 would be particularly important if the member declaration
9376 template <class V = U> friend struct S1;
9378 say, when we should tsubst into `U' when instantiating
9379 S2. On the other hand, when presented with:
9389 we must find the inner binding eventually. We
9390 accomplish this by making sure that the new type we
9391 create to represent this declaration has the right
9393 context = TYPE_CONTEXT (t);
9400 /* If no such tag is yet defined, create a forward-reference node
9401 and record it as the "definition".
9402 When a real declaration of this type is found,
9403 the forward-reference will be altered into a real type. */
9404 if (code == ENUMERAL_TYPE)
9406 error ("use of enum `%#D' without previous declaration", name);
9408 t = make_node (ENUMERAL_TYPE);
9410 /* Give the type a default layout like unsigned int
9411 to avoid crashing if it does not get defined. */
9412 TYPE_MODE (t) = TYPE_MODE (unsigned_type_node);
9413 TYPE_ALIGN (t) = TYPE_ALIGN (unsigned_type_node);
9414 TYPE_USER_ALIGN (t) = 0;
9415 TREE_UNSIGNED (t) = 1;
9416 TYPE_PRECISION (t) = TYPE_PRECISION (unsigned_type_node);
9417 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (unsigned_type_node);
9418 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (unsigned_type_node);
9420 /* Enable us to recognize when a type is created in class context.
9421 To do nested classes correctly, this should probably be cleared
9422 out when we leave this classes scope. Currently this in only
9423 done in `start_enum'. */
9425 pushtag (name, t, globalize);
9429 t = make_aggr_type (code);
9430 TYPE_CONTEXT (t) = context;
9431 pushtag (name, t, globalize);
9436 if (!globalize && processing_template_decl && IS_AGGR_TYPE (t))
9437 redeclare_class_template (t, current_template_parms);
9440 TYPE_ATTRIBUTES (t) = attributes;
9442 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9446 xref_tag_from_type (tree old, tree id, int globalize)
9448 enum tag_types tag_kind;
9450 if (TREE_CODE (old) == RECORD_TYPE)
9451 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9453 tag_kind = union_type;
9455 if (id == NULL_TREE)
9456 id = TYPE_IDENTIFIER (old);
9458 return xref_tag (tag_kind, id, /*attributes=*/NULL_TREE, globalize, false);
9461 /* REF is a type (named NAME), for which we have just seen some
9462 baseclasses. BASE_LIST is a list of those baseclasses; the
9463 TREE_PURPOSE is an access_* node, and the TREE_VALUE is the type of
9464 the base-class. TREE_VIA_VIRTUAL indicates virtual
9465 inheritance. CODE_TYPE_NODE indicates whether REF is a class,
9466 struct, or union. */
9469 xref_basetypes (tree ref, tree base_list)
9471 /* In the declaration `A : X, Y, ... Z' we mark all the types
9472 (A, X, Y, ..., Z) so we can check for duplicates. */
9476 enum tag_types tag_code;
9478 if (ref == error_mark_node)
9481 if (TREE_CODE (ref) == UNION_TYPE)
9483 error ("derived union `%T' invalid", ref);
9487 tag_code = (CLASSTYPE_DECLARED_CLASS (ref) ? class_type : record_type);
9489 /* First, make sure that any templates in base-classes are
9490 instantiated. This ensures that if we call ourselves recursively
9491 we do not get confused about which classes are marked and which
9496 tree basetype = TREE_VALUE (*basep);
9497 if (!(processing_template_decl && uses_template_parms (basetype))
9498 && !complete_type_or_else (basetype, NULL))
9499 /* An incomplete type. Remove it from the list. */
9500 *basep = TREE_CHAIN (*basep);
9502 basep = &TREE_CHAIN (*basep);
9505 SET_CLASSTYPE_MARKED (ref);
9506 i = list_length (base_list);
9509 tree binfo = TYPE_BINFO (ref);
9510 tree binfos = make_tree_vec (i);
9511 tree accesses = make_tree_vec (i);
9513 BINFO_BASETYPES (binfo) = binfos;
9514 BINFO_BASEACCESSES (binfo) = accesses;
9516 for (i = 0; base_list; base_list = TREE_CHAIN (base_list))
9518 tree access = TREE_PURPOSE (base_list);
9519 int via_virtual = TREE_VIA_VIRTUAL (base_list);
9520 tree basetype = TREE_VALUE (base_list);
9523 if (access == access_default_node)
9524 /* The base of a derived struct is public by default. */
9525 access = (tag_code == class_type
9526 ? access_private_node : access_public_node);
9528 if (basetype && TREE_CODE (basetype) == TYPE_DECL)
9529 basetype = TREE_TYPE (basetype);
9531 || (TREE_CODE (basetype) != RECORD_TYPE
9532 && TREE_CODE (basetype) != TYPENAME_TYPE
9533 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9534 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM))
9536 error ("base type `%T' fails to be a struct or class type",
9541 if (CLASSTYPE_MARKED (basetype))
9543 if (basetype == ref)
9544 error ("recursive type `%T' undefined", basetype);
9546 error ("duplicate base type `%T' invalid", basetype);
9550 if (TYPE_FOR_JAVA (basetype)
9551 && (current_lang_depth () == 0))
9552 TYPE_FOR_JAVA (ref) = 1;
9554 if (CLASS_TYPE_P (basetype))
9556 base_binfo = TYPE_BINFO (basetype);
9557 /* This flag will be in the binfo of the base type, we must
9558 clear it after copying the base binfos. */
9559 BINFO_DEPENDENT_BASE_P (base_binfo)
9560 = dependent_type_p (basetype);
9563 base_binfo = make_binfo (size_zero_node, basetype,
9564 NULL_TREE, NULL_TREE);
9566 TREE_VEC_ELT (binfos, i) = base_binfo;
9567 TREE_VEC_ELT (accesses, i) = access;
9568 /* This flag will be in the binfo of the base type, we must
9569 clear it after copying the base binfos. */
9570 TREE_VIA_VIRTUAL (base_binfo) = via_virtual;
9572 SET_CLASSTYPE_MARKED (basetype);
9574 /* We are free to modify these bits because they are meaningless
9575 at top level, and BASETYPE is a top-level type. */
9576 if (via_virtual || TYPE_USES_VIRTUAL_BASECLASSES (basetype))
9578 TYPE_USES_VIRTUAL_BASECLASSES (ref) = 1;
9579 /* Converting to a virtual base class requires looking
9580 up the offset of the virtual base. */
9581 TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (ref) = 1;
9584 if (CLASS_TYPE_P (basetype))
9586 TYPE_HAS_NEW_OPERATOR (ref)
9587 |= TYPE_HAS_NEW_OPERATOR (basetype);
9588 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9589 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9590 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9591 /* If the base-class uses multiple inheritance, so do we. */
9592 TYPE_USES_MULTIPLE_INHERITANCE (ref)
9593 |= TYPE_USES_MULTIPLE_INHERITANCE (basetype);
9594 /* Likewise, if converting to a base of the base may require
9595 code, then we may need to generate code to convert to a
9597 TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (ref)
9598 |= TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (basetype);
9603 TREE_VEC_LENGTH (accesses) = TREE_VEC_LENGTH (binfos) = i;
9605 BINFO_BASEACCESSES (binfo) = BINFO_BASETYPES (binfo) = NULL_TREE;
9609 TYPE_USES_MULTIPLE_INHERITANCE (ref) = 1;
9610 /* If there is more than one non-empty they cannot be at the same
9612 TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (ref) = 1;
9616 /* Copy the base binfos, collect the virtual bases and set the
9617 inheritance order chain. */
9618 copy_base_binfos (TYPE_BINFO (ref), ref, NULL_TREE);
9619 CLASSTYPE_VBASECLASSES (ref) = nreverse (CLASSTYPE_VBASECLASSES (ref));
9621 if (TYPE_FOR_JAVA (ref))
9623 if (TYPE_USES_MULTIPLE_INHERITANCE (ref))
9624 error ("Java class '%T' cannot have multiple bases", ref);
9625 if (CLASSTYPE_VBASECLASSES (ref))
9626 error ("Java class '%T' cannot have virtual bases", ref);
9629 /* Unmark all the types. */
9632 tree basetype = BINFO_TYPE (BINFO_BASETYPE (TYPE_BINFO (ref), i));
9634 CLEAR_CLASSTYPE_MARKED (basetype);
9635 if (CLASS_TYPE_P (basetype))
9637 TREE_VIA_VIRTUAL (TYPE_BINFO (basetype)) = 0;
9638 BINFO_DEPENDENT_BASE_P (TYPE_BINFO (basetype)) = 0;
9641 CLEAR_CLASSTYPE_MARKED (ref);
9645 /* Begin compiling the definition of an enumeration type.
9646 NAME is its name (or null if anonymous).
9647 Returns the type object, as yet incomplete.
9648 Also records info about it so that build_enumerator
9649 may be used to declare the individual values as they are read. */
9652 start_enum (tree name)
9654 tree enumtype = NULL_TREE;
9655 struct cp_binding_level *b = current_binding_level;
9657 /* If this is the real definition for a previous forward reference,
9658 fill in the contents in the same object that used to be the
9659 forward reference. */
9661 if (name != NULL_TREE)
9662 enumtype = lookup_tag (ENUMERAL_TYPE, name, b, 1);
9664 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9666 error ("multiple definition of `%#T'", enumtype);
9667 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9668 /* Clear out TYPE_VALUES, and start again. */
9669 TYPE_VALUES (enumtype) = NULL_TREE;
9673 enumtype = make_node (ENUMERAL_TYPE);
9674 pushtag (name, enumtype, 0);
9680 /* After processing and defining all the values of an enumeration type,
9681 install their decls in the enumeration type and finish it off.
9682 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9685 finish_enum (tree enumtype)
9697 integer_type_kind itk;
9698 tree underlying_type = NULL_TREE;
9700 /* We built up the VALUES in reverse order. */
9701 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9703 /* For an enum defined in a template, just set the type of the values;
9704 all further processing is postponed until the template is
9705 instantiated. We need to set the type so that tsubst of a CONST_DECL
9707 if (processing_template_decl)
9709 for (values = TYPE_VALUES (enumtype);
9711 values = TREE_CHAIN (values))
9712 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9713 if (at_function_scope_p ())
9714 add_stmt (build_min (TAG_DEFN, enumtype));
9718 /* Determine the minimum and maximum values of the enumerators. */
9719 if (TYPE_VALUES (enumtype))
9721 minnode = maxnode = NULL_TREE;
9723 for (values = TYPE_VALUES (enumtype);
9725 values = TREE_CHAIN (values))
9727 decl = TREE_VALUE (values);
9729 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9730 each enumerator has the type of its enumeration. Prior to the
9731 closing brace, the type of each enumerator is the type of its
9732 initializing value. */
9733 TREE_TYPE (decl) = enumtype;
9735 /* Update the minimum and maximum values, if appropriate. */
9736 value = DECL_INITIAL (decl);
9737 /* Figure out what the minimum and maximum values of the
9740 minnode = maxnode = value;
9741 else if (tree_int_cst_lt (maxnode, value))
9743 else if (tree_int_cst_lt (value, minnode))
9746 /* Set the TREE_TYPE for the values as well. That's so that when
9747 we call decl_constant_value we get an entity of the right type
9748 (but with the constant value). But first make a copy so we
9749 don't clobber shared INTEGER_CSTs. */
9750 if (TREE_TYPE (value) != enumtype)
9752 value = DECL_INITIAL (decl) = copy_node (value);
9753 TREE_TYPE (value) = enumtype;
9760 If the enumerator-list is empty, the underlying type is as if
9761 the enumeration had a single enumerator with value 0. */
9762 minnode = maxnode = integer_zero_node;
9764 /* Compute the number of bits require to represent all values of the
9765 enumeration. We must do this before the type of MINNODE and
9766 MAXNODE are transformed, since min_precision relies on the
9767 TREE_TYPE of the value it is passed. */
9768 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9769 lowprec = min_precision (minnode, unsignedp);
9770 highprec = min_precision (maxnode, unsignedp);
9771 precision = MAX (lowprec, highprec);
9773 /* Determine the underlying type of the enumeration.
9777 The underlying type of an enumeration is an integral type that
9778 can represent all the enumerator values defined in the
9779 enumeration. It is implementation-defined which integral type is
9780 used as the underlying type for an enumeration except that the
9781 underlying type shall not be larger than int unless the value of
9782 an enumerator cannot fit in an int or unsigned int.
9784 We use "int" or an "unsigned int" as the underlying type, even if
9785 a smaller integral type would work, unless the user has
9786 explicitly requested that we use the smallest possible type. */
9787 for (itk = (flag_short_enums ? itk_char : itk_int);
9791 underlying_type = integer_types[itk];
9792 if (TYPE_PRECISION (underlying_type) >= precision
9793 && TREE_UNSIGNED (underlying_type) == unsignedp)
9796 if (itk == itk_none)
9800 IF no integral type can represent all the enumerator values, the
9801 enumeration is ill-formed. */
9802 error ("no integral type can represent all of the enumerator values "
9803 "for `%T'", enumtype);
9804 precision = TYPE_PRECISION (long_long_integer_type_node);
9805 underlying_type = integer_types[itk_unsigned_long_long];
9808 /* Compute the minium and maximum values for the type.
9812 For an enumeration where emin is the smallest enumerator and emax
9813 is the largest, the values of the enumeration are the values of the
9814 underlying type in the range bmin to bmax, where bmin and bmax are,
9815 respectively, the smallest and largest values of the smallest bit-
9816 field that can store emin and emax. */
9817 TYPE_PRECISION (enumtype) = precision;
9818 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9822 The value of sizeof() applied to an enumeration type, an object
9823 of an enumeration type, or an enumerator, is the value of sizeof()
9824 applied to the underlying type. */
9825 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9826 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9827 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9828 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9829 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9830 TREE_UNSIGNED (enumtype) = TREE_UNSIGNED (underlying_type);
9832 /* Convert each of the enumerators to the type of the underlying
9833 type of the enumeration. */
9834 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9836 decl = TREE_VALUE (values);
9837 value = perform_implicit_conversion (underlying_type,
9838 DECL_INITIAL (decl));
9839 TREE_TYPE (value) = enumtype;
9840 DECL_INITIAL (decl) = value;
9841 TREE_VALUE (values) = value;
9844 /* Fix up all variant types of this enum type. */
9845 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9847 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9848 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9849 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9850 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9851 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9852 TYPE_MODE (t) = TYPE_MODE (enumtype);
9853 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9854 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9855 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9856 TREE_UNSIGNED (t) = TREE_UNSIGNED (enumtype);
9859 /* Finish debugging output for this type. */
9860 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9863 /* Build and install a CONST_DECL for an enumeration constant of the
9864 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9865 Assignment of sequential values by default is handled here. */
9868 build_enumerator (tree name, tree value, tree enumtype)
9874 /* Remove no-op casts from the value. */
9876 STRIP_TYPE_NOPS (value);
9878 if (! processing_template_decl)
9880 /* Validate and default VALUE. */
9881 if (value != NULL_TREE)
9883 value = decl_constant_value (value);
9885 if (TREE_CODE (value) == INTEGER_CST)
9887 value = perform_integral_promotions (value);
9888 constant_expression_warning (value);
9892 error ("enumerator value for `%D' not integer constant", name);
9897 /* Default based on previous value. */
9898 if (value == NULL_TREE)
9902 if (TYPE_VALUES (enumtype))
9904 /* The next value is the previous value ... */
9905 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9907 value = cp_build_binary_op (PLUS_EXPR,
9911 if (tree_int_cst_lt (value, prev_value))
9912 error ("overflow in enumeration values at `%D'", name);
9915 value = integer_zero_node;
9918 /* Remove no-op casts from the value. */
9919 STRIP_TYPE_NOPS (value);
9922 /* C++ associates enums with global, function, or class declarations. */
9923 context = current_scope ();
9925 context = current_namespace;
9927 /* Build the actual enumeration constant. Note that the enumeration
9928 constants have the type of their initializers until the
9929 enumeration is complete:
9933 Following the closing brace of an enum-specifier, each enumer-
9934 ator has the type of its enumeration. Prior to the closing
9935 brace, the type of each enumerator is the type of its
9938 In finish_enum we will reset the type. Of course, if we're
9939 processing a template, there may be no value. */
9940 type = value ? TREE_TYPE (value) : NULL_TREE;
9942 if (context && context == current_class_type)
9943 /* This enum declaration is local to the class. We need the full
9944 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9945 decl = build_lang_decl (CONST_DECL, name, type);
9947 /* It's a global enum, or it's local to a function. (Note local to
9948 a function could mean local to a class method. */
9949 decl = build_decl (CONST_DECL, name, type);
9951 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
9952 TREE_CONSTANT (decl) = TREE_READONLY (decl) = 1;
9953 DECL_INITIAL (decl) = value;
9955 if (context && context == current_class_type)
9956 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
9957 on the TYPE_FIELDS list for `S'. (That's so that you can say
9958 things like `S::i' later.) */
9959 finish_member_declaration (decl);
9963 /* Add this enumeration constant to the list for this type. */
9964 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
9968 /* We're defining DECL. Make sure that it's type is OK. */
9971 check_function_type (tree decl, tree current_function_parms)
9973 tree fntype = TREE_TYPE (decl);
9974 tree return_type = complete_type (TREE_TYPE (fntype));
9976 /* In a function definition, arg types must be complete. */
9977 require_complete_types_for_parms (current_function_parms);
9979 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
9981 error ("return type `%#T' is incomplete", TREE_TYPE (fntype));
9983 /* Make it return void instead, but don't change the
9984 type of the DECL_RESULT, in case we have a named return value. */
9985 if (TREE_CODE (fntype) == METHOD_TYPE)
9987 tree ctype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype)));
9989 = build_method_type_directly (ctype,
9991 FUNCTION_ARG_CHAIN (decl));
9995 = build_function_type (void_type_node,
9996 TYPE_ARG_TYPES (TREE_TYPE (decl)));
9998 = build_exception_variant (fntype,
9999 TYPE_RAISES_EXCEPTIONS (fntype));
10002 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10005 /* Create the FUNCTION_DECL for a function definition.
10006 DECLSPECS and DECLARATOR are the parts of the declaration;
10007 they describe the function's name and the type it returns,
10008 but twisted together in a fashion that parallels the syntax of C.
10010 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10011 DECLARATOR is really the DECL for the function we are about to
10012 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10013 indicating that the function is an inline defined in-class.
10015 This function creates a binding context for the function body
10016 as well as setting up the FUNCTION_DECL in current_function_decl.
10018 Returns 1 on success. If the DECLARATOR is not suitable for a function
10019 (it defines a datum instead), we return 0, which tells
10020 yyparse to report a parse error.
10022 For C++, we must first check whether that datum makes any sense.
10023 For example, "class A local_a(1,2);" means that variable local_a
10024 is an aggregate of type A, which should have a constructor
10025 applied to it with the argument list [1, 2]. */
10028 start_function (tree declspecs, tree declarator, tree attrs, int flags)
10031 tree ctype = NULL_TREE;
10034 int doing_friend = 0;
10035 struct cp_binding_level *bl;
10036 tree current_function_parms;
10038 /* Sanity check. */
10039 my_friendly_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE, 160);
10040 my_friendly_assert (TREE_CHAIN (void_list_node) == NULL_TREE, 161);
10042 /* This should only be done once on the top most decl. */
10043 if (have_extern_spec)
10045 declspecs = tree_cons (NULL_TREE, get_identifier ("extern"), declspecs);
10046 have_extern_spec = false;
10049 if (flags & SF_PRE_PARSED)
10051 decl1 = declarator;
10053 fntype = TREE_TYPE (decl1);
10054 if (TREE_CODE (fntype) == METHOD_TYPE)
10055 ctype = TYPE_METHOD_BASETYPE (fntype);
10057 /* ISO C++ 11.4/5. A friend function defined in a class is in
10058 the (lexical) scope of the class in which it is defined. */
10059 if (!ctype && DECL_FRIEND_P (decl1))
10061 ctype = DECL_FRIEND_CONTEXT (decl1);
10063 /* CTYPE could be null here if we're dealing with a template;
10064 for example, `inline friend float foo()' inside a template
10065 will have no CTYPE set. */
10066 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10072 last_function_parms = DECL_ARGUMENTS (decl1);
10076 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10077 /* If the declarator is not suitable for a function definition,
10078 cause a syntax error. */
10079 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10082 cplus_decl_attributes (&decl1, attrs, 0);
10084 /* If #pragma weak was used, mark the decl weak now. */
10085 if (global_scope_p (current_binding_level))
10086 maybe_apply_pragma_weak (decl1);
10088 fntype = TREE_TYPE (decl1);
10090 restype = TREE_TYPE (fntype);
10092 if (TREE_CODE (fntype) == METHOD_TYPE)
10093 ctype = TYPE_METHOD_BASETYPE (fntype);
10094 else if (DECL_MAIN_P (decl1))
10096 /* If this doesn't return integer_type, or a typedef to
10097 integer_type, complain. */
10098 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl1)), integer_type_node))
10100 if (pedantic || warn_return_type)
10101 pedwarn ("return type for `main' changed to `int'");
10102 TREE_TYPE (decl1) = fntype = default_function_type;
10107 if (DECL_DECLARED_INLINE_P (decl1)
10108 && lookup_attribute ("noinline", attrs))
10109 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
10111 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10112 /* This is a constructor, we must ensure that any default args
10113 introduced by this definition are propagated to the clones
10114 now. The clones are used directly in overload resolution. */
10115 adjust_clone_args (decl1);
10117 /* Sometimes we don't notice that a function is a static member, and
10118 build a METHOD_TYPE for it. Fix that up now. */
10119 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10120 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10122 revert_static_member_fn (decl1);
10123 last_function_parms = TREE_CHAIN (last_function_parms);
10127 /* Warn if function was previously implicitly declared
10128 (but not if we warned then). */
10129 if (! warn_implicit
10130 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)) != NULL_TREE)
10131 cp_warning_at ("`%D' implicitly declared before its definition", IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)));
10133 /* Set up current_class_type, and enter the scope of the class, if
10136 push_nested_class (ctype);
10137 else if (DECL_STATIC_FUNCTION_P (decl1))
10138 push_nested_class (DECL_CONTEXT (decl1));
10140 /* Now that we have entered the scope of the class, we must restore
10141 the bindings for any template parameters surrounding DECL1, if it
10142 is an inline member template. (Order is important; consider the
10143 case where a template parameter has the same name as a field of
10144 the class.) It is not until after this point that
10145 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10146 if (flags & SF_INCLASS_INLINE)
10147 maybe_begin_member_template_processing (decl1);
10149 /* Effective C++ rule 15. */
10151 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10152 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10153 warning ("`operator=' should return a reference to `*this'");
10155 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10156 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10157 if (!DECL_INITIAL (decl1))
10158 DECL_INITIAL (decl1) = error_mark_node;
10160 /* This function exists in static storage.
10161 (This does not mean `static' in the C sense!) */
10162 TREE_STATIC (decl1) = 1;
10164 /* We must call push_template_decl after current_class_type is set
10165 up. (If we are processing inline definitions after exiting a
10166 class scope, current_class_type will be NULL_TREE until set above
10167 by push_nested_class.) */
10168 if (processing_template_decl)
10169 decl1 = push_template_decl (decl1);
10171 /* We are now in the scope of the function being defined. */
10172 current_function_decl = decl1;
10174 /* Save the parm names or decls from this function's declarator
10175 where store_parm_decls will find them. */
10176 current_function_parms = last_function_parms;
10178 /* Make sure the parameter and return types are reasonable. When
10179 you declare a function, these types can be incomplete, but they
10180 must be complete when you define the function. */
10181 if (! processing_template_decl)
10182 check_function_type (decl1, current_function_parms);
10184 /* Build the return declaration for the function. */
10185 restype = TREE_TYPE (fntype);
10186 /* Promote the value to int before returning it. */
10187 if (c_promoting_integer_type_p (restype))
10188 restype = type_promotes_to (restype);
10189 if (DECL_RESULT (decl1) == NULL_TREE)
10191 DECL_RESULT (decl1)
10192 = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10193 c_apply_type_quals_to_decl (cp_type_quals (restype),
10194 DECL_RESULT (decl1));
10197 /* Initialize RTL machinery. We cannot do this until
10198 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10199 even when processing a template; this is how we get
10200 CFUN set up, and our per-function variables initialized.
10201 FIXME factor out the non-RTL stuff. */
10202 bl = current_binding_level;
10203 allocate_struct_function (decl1);
10204 current_binding_level = bl;
10206 /* Even though we're inside a function body, we still don't want to
10207 call expand_expr to calculate the size of a variable-sized array.
10208 We haven't necessarily assigned RTL to all variables yet, so it's
10209 not safe to try to expand expressions involving them. */
10210 immediate_size_expand = 0;
10211 cfun->x_dont_save_pending_sizes_p = 1;
10213 /* Start the statement-tree, start the tree now. */
10214 begin_stmt_tree (&DECL_SAVED_TREE (decl1));
10216 /* Don't double-count statements in templates. */
10217 DECL_ESTIMATED_INSNS (decl1) = 0;
10219 /* Let the user know we're compiling this function. */
10220 announce_function (decl1);
10222 /* Record the decl so that the function name is defined.
10223 If we already have a decl for this name, and it is a FUNCTION_DECL,
10224 use the old decl. */
10225 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10227 /* A specialization is not used to guide overload resolution. */
10228 if (!DECL_TEMPLATE_SPECIALIZATION (decl1)
10229 && ! DECL_FUNCTION_MEMBER_P (decl1))
10231 tree olddecl = pushdecl (decl1);
10233 if (olddecl == error_mark_node)
10234 /* If something went wrong when registering the declaration,
10235 use DECL1; we have to have a FUNCTION_DECL to use when
10236 parsing the body of the function. */
10239 /* Otherwise, OLDDECL is either a previous declaration of
10240 the same function or DECL1 itself. */
10245 /* We need to set the DECL_CONTEXT. */
10246 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10247 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10248 /* And make sure we have enough default args. */
10249 check_default_args (decl1);
10251 fntype = TREE_TYPE (decl1);
10254 /* Reset these in case the call to pushdecl changed them. */
10255 current_function_decl = decl1;
10256 cfun->decl = decl1;
10258 /* If we are (erroneously) defining a function that we have already
10259 defined before, wipe out what we knew before. */
10260 if (!DECL_PENDING_INLINE_P (decl1))
10261 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10263 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10265 /* We know that this was set up by `grokclassfn'. We do not
10266 wait until `store_parm_decls', since evil parse errors may
10267 never get us to that point. Here we keep the consistency
10268 between `current_class_type' and `current_class_ptr'. */
10269 tree t = DECL_ARGUMENTS (decl1);
10271 my_friendly_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL,
10273 my_friendly_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE,
10276 cp_function_chain->x_current_class_ref
10277 = build_indirect_ref (t, NULL);
10278 cp_function_chain->x_current_class_ptr = t;
10280 /* Constructors and destructors need to know whether they're "in
10281 charge" of initializing virtual base classes. */
10282 t = TREE_CHAIN (t);
10283 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10285 current_in_charge_parm = t;
10286 t = TREE_CHAIN (t);
10288 if (DECL_HAS_VTT_PARM_P (decl1))
10290 if (DECL_NAME (t) != vtt_parm_identifier)
10292 current_vtt_parm = t;
10296 if (DECL_INTERFACE_KNOWN (decl1))
10298 tree ctx = decl_function_context (decl1);
10300 if (DECL_NOT_REALLY_EXTERN (decl1))
10301 DECL_EXTERNAL (decl1) = 0;
10303 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10304 && TREE_PUBLIC (ctx))
10305 /* This is a function in a local class in an extern inline
10307 comdat_linkage (decl1);
10309 /* If this function belongs to an interface, it is public.
10310 If it belongs to someone else's interface, it is also external.
10311 This only affects inlines and template instantiations. */
10312 else if (interface_unknown == 0
10313 && (! DECL_TEMPLATE_INSTANTIATION (decl1)
10314 || flag_alt_external_templates))
10316 if (DECL_DECLARED_INLINE_P (decl1)
10317 || DECL_TEMPLATE_INSTANTIATION (decl1)
10318 || processing_template_decl)
10320 DECL_EXTERNAL (decl1)
10322 || (DECL_DECLARED_INLINE_P (decl1)
10323 && ! flag_implement_inlines
10324 && !DECL_VINDEX (decl1)));
10326 /* For WIN32 we also want to put these in linkonce sections. */
10327 maybe_make_one_only (decl1);
10330 DECL_EXTERNAL (decl1) = 0;
10331 DECL_NOT_REALLY_EXTERN (decl1) = 0;
10332 DECL_INTERFACE_KNOWN (decl1) = 1;
10334 else if (interface_unknown && interface_only
10335 && (! DECL_TEMPLATE_INSTANTIATION (decl1)
10336 || flag_alt_external_templates))
10338 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10339 interface, we will have interface_only set but not
10340 interface_known. In that case, we don't want to use the normal
10341 heuristics because someone will supply a #pragma implementation
10342 elsewhere, and deducing it here would produce a conflict. */
10343 comdat_linkage (decl1);
10344 DECL_EXTERNAL (decl1) = 0;
10345 DECL_INTERFACE_KNOWN (decl1) = 1;
10346 DECL_DEFER_OUTPUT (decl1) = 1;
10350 /* This is a definition, not a reference.
10351 So clear DECL_EXTERNAL. */
10352 DECL_EXTERNAL (decl1) = 0;
10354 if ((DECL_DECLARED_INLINE_P (decl1)
10355 || DECL_TEMPLATE_INSTANTIATION (decl1))
10356 && ! DECL_INTERFACE_KNOWN (decl1)
10357 /* Don't try to defer nested functions for now. */
10358 && ! decl_function_context (decl1))
10359 DECL_DEFER_OUTPUT (decl1) = 1;
10361 DECL_INTERFACE_KNOWN (decl1) = 1;
10364 begin_scope (sk_function_parms, decl1);
10368 if (DECL_DESTRUCTOR_P (decl1))
10370 dtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10371 DECL_CONTEXT (dtor_label) = current_function_decl;
10374 start_fname_decls ();
10376 store_parm_decls (current_function_parms);
10381 /* Store the parameter declarations into the current function declaration.
10382 This is called after parsing the parameter declarations, before
10383 digesting the body of the function.
10385 Also install to binding contour return value identifier, if any. */
10388 store_parm_decls (tree current_function_parms)
10390 tree fndecl = current_function_decl;
10393 /* This is a chain of any other decls that came in among the parm
10394 declarations. If a parm is declared with enum {foo, bar} x;
10395 then CONST_DECLs for foo and bar are put here. */
10396 tree nonparms = NULL_TREE;
10398 if (current_function_parms)
10400 /* This case is when the function was defined with an ANSI prototype.
10401 The parms already have decls, so we need not do anything here
10402 except record them as in effect
10403 and complain if any redundant old-style parm decls were written. */
10405 tree specparms = current_function_parms;
10408 /* Must clear this because it might contain TYPE_DECLs declared
10410 current_binding_level->names = NULL;
10412 /* If we're doing semantic analysis, then we'll call pushdecl
10413 for each of these. We must do them in reverse order so that
10414 they end in the correct forward order. */
10415 specparms = nreverse (specparms);
10417 for (parm = specparms; parm; parm = next)
10419 next = TREE_CHAIN (parm);
10420 if (TREE_CODE (parm) == PARM_DECL)
10422 if (DECL_NAME (parm) == NULL_TREE
10423 || TREE_CODE (parm) != VOID_TYPE)
10426 error ("parameter `%D' declared void", parm);
10430 /* If we find an enum constant or a type tag,
10431 put it aside for the moment. */
10432 TREE_CHAIN (parm) = NULL_TREE;
10433 nonparms = chainon (nonparms, parm);
10437 /* Get the decls in their original chain order and record in the
10438 function. This is all and only the PARM_DECLs that were
10439 pushed into scope by the loop above. */
10440 DECL_ARGUMENTS (fndecl) = getdecls ();
10443 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10445 /* Now store the final chain of decls for the arguments
10446 as the decl-chain of the current lexical scope.
10447 Put the enumerators in as well, at the front so that
10448 DECL_ARGUMENTS is not modified. */
10449 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10451 /* Do the starting of the exception specifications, if we have any. */
10452 if (flag_exceptions && !processing_template_decl
10453 && flag_enforce_eh_specs
10454 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10455 current_eh_spec_block = begin_eh_spec_block ();
10459 /* We have finished doing semantic analysis on DECL, but have not yet
10460 generated RTL for its body. Save away our current state, so that
10461 when we want to generate RTL later we know what to do. */
10464 save_function_data (tree decl)
10466 struct language_function *f;
10468 /* Save the language-specific per-function data so that we can
10469 get it back when we really expand this function. */
10470 my_friendly_assert (!DECL_PENDING_INLINE_P (decl),
10474 f = ggc_alloc (sizeof (struct language_function));
10475 memcpy (f, cp_function_chain, sizeof (struct language_function));
10476 DECL_SAVED_FUNCTION_DATA (decl) = f;
10478 /* Clear out the bits we don't need. */
10479 f->base.x_stmt_tree.x_last_stmt = NULL_TREE;
10480 f->base.x_stmt_tree.x_last_expr_type = NULL_TREE;
10481 f->x_named_label_uses = NULL;
10482 f->bindings = NULL;
10483 f->x_local_names = NULL;
10485 /* If we've already decided that we cannot inline this function, we
10486 must remember that fact when we actually go to expand the
10488 if (current_function_cannot_inline)
10490 f->cannot_inline = current_function_cannot_inline;
10491 DECL_INLINE (decl) = 0;
10495 /* Add a note to mark the beginning of the main body of the constructor.
10496 This is used to set up the data structures for the cleanup regions for
10497 fully-constructed bases and members. */
10500 begin_constructor_body (void)
10504 /* Add a note to mark the end of the main body of the constructor. This is
10505 used to end the cleanup regions for fully-constructed bases and
10509 finish_constructor_body (void)
10513 /* Do all the processing for the beginning of a destructor; set up the
10514 vtable pointers and cleanups for bases and members. */
10517 begin_destructor_body (void)
10520 tree compound_stmt;
10522 /* If the dtor is empty, and we know there is not any possible
10523 way we could use any vtable entries, before they are possibly
10524 set by a base class dtor, we don't have to setup the vtables,
10525 as we know that any base class dtor will set up any vtables
10526 it needs. We avoid MI, because one base class dtor can do a
10527 virtual dispatch to an overridden function that would need to
10528 have a non-related vtable set up, we cannot avoid setting up
10529 vtables in that case. We could change this to see if there
10530 is just one vtable.
10532 ??? In the destructor for a class, the vtables are set
10533 appropriately for that class. There will be no non-related
10534 vtables. jason 2001-12-11. */
10535 if_stmt = begin_if_stmt ();
10537 /* If it is not safe to avoid setting up the vtables, then
10538 someone will change the condition to be boolean_true_node.
10539 (Actually, for now, we do not have code to set the condition
10540 appropriately, so we just assume that we always need to
10541 initialize the vtables.) */
10542 finish_if_stmt_cond (boolean_true_node, if_stmt);
10544 compound_stmt = begin_compound_stmt (/*has_no_scope=*/false);
10546 /* Make all virtual function table pointers in non-virtual base
10547 classes point to CURRENT_CLASS_TYPE's virtual function
10549 initialize_vtbl_ptrs (current_class_ptr);
10551 finish_compound_stmt (compound_stmt);
10552 finish_then_clause (if_stmt);
10555 /* And insert cleanups for our bases and members so that they
10556 will be properly destroyed if we throw. */
10557 push_base_cleanups ();
10560 /* At the end of every destructor we generate code to delete the object if
10561 necessary. Do that now. */
10564 finish_destructor_body (void)
10568 /* Any return from a destructor will end up here; that way all base
10569 and member cleanups will be run when the function returns. */
10570 add_stmt (build_stmt (LABEL_STMT, dtor_label));
10572 /* In a virtual destructor, we must call delete. */
10573 if (DECL_VIRTUAL_P (current_function_decl))
10576 tree virtual_size = cxx_sizeof (current_class_type);
10580 At the point of definition of a virtual destructor (including
10581 an implicit definition), non-placement operator delete shall
10582 be looked up in the scope of the destructor's class and if
10583 found shall be accessible and unambiguous. */
10584 exprstmt = build_op_delete_call
10585 (DELETE_EXPR, current_class_ptr, virtual_size,
10586 LOOKUP_NORMAL | LOOKUP_SPECULATIVELY, NULL_TREE);
10588 if_stmt = begin_if_stmt ();
10589 finish_if_stmt_cond (build (BIT_AND_EXPR, integer_type_node,
10590 current_in_charge_parm,
10593 finish_expr_stmt (exprstmt);
10594 finish_then_clause (if_stmt);
10599 /* Do the necessary processing for the beginning of a function body, which
10600 in this case includes member-initializers, but not the catch clauses of
10601 a function-try-block. Currently, this means opening a binding level
10602 for the member-initializers (in a ctor) and member cleanups (in a dtor).
10603 In other functions, this isn't necessary, but it doesn't hurt. */
10606 begin_function_body (void)
10610 if (processing_template_decl)
10611 /* Do nothing now. */;
10613 /* Always keep the BLOCK node associated with the outermost pair of
10614 curly braces of a function. These are needed for correct
10615 operation of dwarfout.c. */
10616 keep_next_level (true);
10618 stmt = begin_compound_stmt (/*has_no_scope=*/false);
10619 COMPOUND_STMT_BODY_BLOCK (stmt) = 1;
10621 if (processing_template_decl)
10622 /* Do nothing now. */;
10623 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10624 begin_constructor_body ();
10625 else if (DECL_DESTRUCTOR_P (current_function_decl))
10626 begin_destructor_body ();
10631 /* Do the processing for the end of a function body. Currently, this means
10632 closing out the cleanups for fully-constructed bases and members, and in
10633 the case of the destructor, deleting the object if desired. Again, this
10634 is only meaningful for [cd]tors, since they are the only functions where
10635 there is a significant distinction between the main body and any
10636 function catch clauses. Handling, say, main() return semantics here
10637 would be wrong, as flowing off the end of a function catch clause for
10638 main() would also need to return 0. */
10641 finish_function_body (tree compstmt)
10643 /* Close the block. */
10644 finish_compound_stmt (compstmt);
10646 if (processing_template_decl)
10647 /* Do nothing now. */;
10648 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10649 finish_constructor_body ();
10650 else if (DECL_DESTRUCTOR_P (current_function_decl))
10651 finish_destructor_body ();
10654 /* Finish up a function declaration and compile that function
10655 all the way to assembler language output. The free the storage
10656 for the function definition.
10658 FLAGS is a bitwise or of the following values:
10660 We just finished processing the body of an in-class inline
10661 function definition. (This processing will have taken place
10662 after the class definition is complete.) */
10665 finish_function (int flags)
10667 tree fndecl = current_function_decl;
10668 tree fntype, ctype = NULL_TREE;
10669 int inclass_inline = (flags & 2) != 0;
10672 /* When we get some parse errors, we can end up without a
10673 current_function_decl, so cope. */
10674 if (fndecl == NULL_TREE)
10675 return error_mark_node;
10677 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10678 && DECL_VIRTUAL_P (fndecl)
10679 && !processing_template_decl)
10681 tree fnclass = DECL_CONTEXT (fndecl);
10682 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10683 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10686 nested = function_depth > 1;
10687 fntype = TREE_TYPE (fndecl);
10689 /* TREE_READONLY (fndecl) = 1;
10690 This caused &foo to be of type ptr-to-const-function
10691 which then got a warning when stored in a ptr-to-function variable. */
10693 my_friendly_assert (building_stmt_tree (), 20000911);
10695 finish_fname_decls ();
10697 /* For a cloned function, we've already got all the code we need;
10698 there's no need to add any extra bits. */
10699 if (!DECL_CLONED_FUNCTION_P (fndecl))
10701 if (DECL_MAIN_P (current_function_decl))
10703 /* Make it so that `main' always returns 0 by default. */
10705 finish_return_stmt (integer_one_node);
10707 finish_return_stmt (integer_zero_node);
10711 /* Finish dealing with exception specifiers. */
10712 if (flag_exceptions && !processing_template_decl
10713 && flag_enforce_eh_specs
10714 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10715 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10716 (TREE_TYPE (current_function_decl)),
10717 current_eh_spec_block);
10720 /* If we're saving up tree structure, tie off the function now. */
10721 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
10723 /* If this function can't throw any exceptions, remember that. */
10724 if (!processing_template_decl
10725 && !cp_function_chain->can_throw
10726 && !flag_non_call_exceptions)
10727 TREE_NOTHROW (fndecl) = 1;
10729 /* This must come after expand_function_end because cleanups might
10730 have declarations (from inline functions) that need to go into
10731 this function's blocks. */
10733 /* If the current binding level isn't the outermost binding level
10734 for this function, either there is a bug, or we have experienced
10735 syntax errors and the statement tree is malformed. */
10736 if (current_binding_level->kind != sk_function_parms)
10738 /* Make sure we have already experienced errors. */
10739 if (errorcount == 0)
10742 /* Throw away the broken statement tree and extra binding
10744 DECL_SAVED_TREE (fndecl) = build_stmt (COMPOUND_STMT, NULL_TREE);
10746 while (current_binding_level->kind != sk_function_parms)
10748 if (current_binding_level->kind == sk_class)
10749 pop_nested_class ();
10751 poplevel (0, 0, 0);
10754 poplevel (1, 0, 1);
10756 /* Statements should always be full-expressions at the outermost set
10757 of curly braces for a function. */
10758 my_friendly_assert (stmts_are_full_exprs_p (), 19990831);
10760 /* Set up the named return value optimization, if we can. Here, we
10761 eliminate the copy from the nrv into the RESULT_DECL and any cleanup
10762 for the nrv. genrtl_start_function and declare_return_variable
10763 handle making the nrv and RESULT_DECL share space. */
10764 if (current_function_return_value)
10766 tree r = current_function_return_value;
10769 if (r != error_mark_node
10770 /* This is only worth doing for fns that return in memory--and
10771 simpler, since we don't have to worry about promoted modes. */
10772 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10773 /* Only allow this for variables declared in the outer scope of
10774 the function so we know that their lifetime always ends with a
10775 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10776 we were to do this optimization in tree-ssa. */
10777 /* Skip the artificial function body block. */
10778 && (outer = BLOCK_SUBBLOCKS (BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl))),
10779 chain_member (r, BLOCK_VARS (outer))))
10782 DECL_ALIGN (r) = DECL_ALIGN (DECL_RESULT (fndecl));
10783 walk_tree_without_duplicates (&DECL_SAVED_TREE (fndecl),
10784 nullify_returns_r, r);
10787 /* Clear it so genrtl_start_function and declare_return_variable
10788 know we're not optimizing. */
10789 current_function_return_value = NULL_TREE;
10792 /* Remember that we were in class scope. */
10793 if (current_class_name)
10794 ctype = current_class_type;
10796 /* Must mark the RESULT_DECL as being in this function. */
10797 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10799 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10800 to the FUNCTION_DECL node itself. */
10801 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10803 /* Save away current state, if appropriate. */
10804 if (!processing_template_decl)
10805 save_function_data (fndecl);
10807 /* If this function calls `setjmp' it cannot be inlined. When
10808 `longjmp' is called it is not guaranteed to restore the value of
10809 local variables that have been modified since the call to
10810 `setjmp'. So, if were to inline this function into some caller
10811 `c', then when we `longjmp', we might not restore all variables
10812 in `c'. (It might seem, at first blush, that there's no way for
10813 this function to modify local variables in `c', but their
10814 addresses may have been stored somewhere accessible to this
10816 if (!processing_template_decl && calls_setjmp_p (fndecl))
10817 DECL_UNINLINABLE (fndecl) = 1;
10819 /* Complain if there's just no return statement. */
10820 if (warn_return_type
10821 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10822 && !dependent_type_p (TREE_TYPE (fntype))
10823 && !current_function_returns_value && !current_function_returns_null
10824 /* Don't complain if we abort or throw. */
10825 && !current_function_returns_abnormally
10826 && !DECL_NAME (DECL_RESULT (fndecl))
10827 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10828 inline function, as we might never be compiled separately. */
10829 && (DECL_INLINE (fndecl) || processing_template_decl))
10830 warning ("no return statement in function returning non-void");
10832 /* We're leaving the context of this function, so zap cfun. It's still in
10833 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
10835 current_function_decl = NULL;
10837 /* If this is an in-class inline definition, we may have to pop the
10838 bindings for the template parameters that we added in
10839 maybe_begin_member_template_processing when start_function was
10841 if (inclass_inline)
10842 maybe_end_member_template_processing ();
10844 /* Leave the scope of the class. */
10846 pop_nested_class ();
10852 /* Let the error reporting routines know that we're outside a
10853 function. For a nested function, this value is used in
10854 cxx_pop_function_context and then reset via pop_function_context. */
10855 current_function_decl = NULL_TREE;
10860 /* Create the FUNCTION_DECL for a function definition.
10861 DECLSPECS and DECLARATOR are the parts of the declaration;
10862 they describe the return type and the name of the function,
10863 but twisted together in a fashion that parallels the syntax of C.
10865 This function creates a binding context for the function body
10866 as well as setting up the FUNCTION_DECL in current_function_decl.
10868 Returns a FUNCTION_DECL on success.
10870 If the DECLARATOR is not suitable for a function (it defines a datum
10871 instead), we return 0, which tells yyparse to report a parse error.
10873 May return void_type_node indicating that this method is actually
10874 a friend. See grokfield for more details.
10876 Came here with a `.pushlevel' .
10878 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10879 CHANGES TO CODE IN `grokfield'. */
10882 start_method (tree declspecs, tree declarator, tree attrlist)
10884 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10887 if (fndecl == error_mark_node)
10888 return error_mark_node;
10890 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10892 error ("invalid member function declaration");
10893 return error_mark_node;
10897 cplus_decl_attributes (&fndecl, attrlist, 0);
10899 /* Pass friends other than inline friend functions back. */
10900 if (fndecl == void_type_node)
10903 if (DECL_IN_AGGR_P (fndecl))
10905 if (IDENTIFIER_ERROR_LOCUS (DECL_ASSEMBLER_NAME (fndecl)) != current_class_type)
10907 if (DECL_CONTEXT (fndecl)
10908 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
10909 error ("`%D' is already defined in class `%T'", fndecl,
10910 DECL_CONTEXT (fndecl));
10912 return void_type_node;
10915 check_template_shadow (fndecl);
10917 DECL_DECLARED_INLINE_P (fndecl) = 1;
10918 if (flag_default_inline)
10919 DECL_INLINE (fndecl) = 1;
10921 /* We process method specializations in finish_struct_1. */
10922 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
10924 fndecl = push_template_decl (fndecl);
10925 if (fndecl == error_mark_node)
10929 if (! DECL_FRIEND_P (fndecl))
10931 if (TREE_CHAIN (fndecl))
10933 fndecl = copy_node (fndecl);
10934 TREE_CHAIN (fndecl) = NULL_TREE;
10936 grok_special_member_properties (fndecl);
10939 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
10941 /* Make a place for the parms. */
10942 begin_scope (sk_function_parms, fndecl);
10944 DECL_IN_AGGR_P (fndecl) = 1;
10948 /* Go through the motions of finishing a function definition.
10949 We don't compile this method until after the whole class has
10952 FINISH_METHOD must return something that looks as though it
10953 came from GROKFIELD (since we are defining a method, after all).
10955 This is called after parsing the body of the function definition.
10956 STMTS is the chain of statements that makes up the function body.
10958 DECL is the ..._DECL that `start_method' provided. */
10961 finish_method (tree decl)
10963 tree fndecl = decl;
10968 if (decl == void_type_node)
10971 old_initial = DECL_INITIAL (fndecl);
10973 /* Undo the level for the parms (from start_method).
10974 This is like poplevel, but it causes nothing to be
10975 saved. Saving information here confuses symbol-table
10976 output routines. Besides, this information will
10977 be correctly output when this method is actually
10980 /* Clear out the meanings of the local variables of this level;
10981 also record in each decl which block it belongs to. */
10983 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
10985 if (DECL_NAME (link) != NULL_TREE)
10986 pop_binding (DECL_NAME (link), link);
10987 my_friendly_assert (TREE_CODE (link) != FUNCTION_DECL, 163);
10988 DECL_CONTEXT (link) = NULL_TREE;
10991 poplevel (0, 0, 0);
10993 DECL_INITIAL (fndecl) = old_initial;
10995 /* We used to check if the context of FNDECL was different from
10996 current_class_type as another way to get inside here. This didn't work
10997 for String.cc in libg++. */
10998 if (DECL_FRIEND_P (fndecl))
11000 CLASSTYPE_INLINE_FRIENDS (current_class_type)
11001 = tree_cons (NULL_TREE, fndecl, CLASSTYPE_INLINE_FRIENDS (current_class_type));
11002 decl = void_type_node;
11009 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11010 we can lay it out later, when and if its type becomes complete. */
11013 maybe_register_incomplete_var (tree var)
11015 my_friendly_assert (TREE_CODE (var) == VAR_DECL, 20020406);
11017 /* Keep track of variables with incomplete types. */
11018 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11019 && DECL_EXTERNAL (var))
11021 tree inner_type = TREE_TYPE (var);
11023 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11024 inner_type = TREE_TYPE (inner_type);
11025 inner_type = TYPE_MAIN_VARIANT (inner_type);
11027 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11028 /* RTTI TD entries are created while defining the type_info. */
11029 || (TYPE_LANG_SPECIFIC (inner_type)
11030 && TYPE_BEING_DEFINED (inner_type)))
11031 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11035 /* Called when a class type (given by TYPE) is defined. If there are
11036 any existing VAR_DECLs whose type hsa been completed by this
11037 declaration, update them now. */
11040 complete_vars (tree type)
11042 tree *list = &incomplete_vars;
11044 my_friendly_assert (CLASS_TYPE_P (type), 20020406);
11047 if (same_type_p (type, TREE_PURPOSE (*list)))
11049 tree var = TREE_VALUE (*list);
11050 /* Complete the type of the variable. The VAR_DECL itself
11051 will be laid out in expand_expr. */
11052 complete_type (TREE_TYPE (var));
11053 /* Remove this entry from the list. */
11054 *list = TREE_CHAIN (*list);
11057 list = &TREE_CHAIN (*list);
11061 /* If DECL is of a type which needs a cleanup, build that cleanup
11065 cxx_maybe_build_cleanup (tree decl)
11067 tree type = TREE_TYPE (decl);
11069 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11071 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11074 if (TREE_CODE (type) == ARRAY_TYPE)
11078 cxx_mark_addressable (decl);
11079 rval = build_unary_op (ADDR_EXPR, decl, 0);
11082 /* Optimize for space over speed here. */
11083 if (! TYPE_USES_VIRTUAL_BASECLASSES (type)
11084 || flag_expensive_optimizations)
11085 flags |= LOOKUP_NONVIRTUAL;
11087 rval = build_delete (TREE_TYPE (rval), rval,
11088 sfk_complete_destructor, flags, 0);
11090 if (TYPE_USES_VIRTUAL_BASECLASSES (type)
11091 && ! TYPE_HAS_DESTRUCTOR (type))
11092 rval = build_compound_expr (rval, build_vbase_delete (type, decl));
11099 /* When a stmt has been parsed, this function is called. */
11104 /* Always assume this statement was not an expression statement. If
11105 it actually was an expression statement, its our callers
11106 responsibility to fix this up. */
11107 last_expr_type = NULL_TREE;
11110 /* DECL was originally constructed as a non-static member function,
11111 but turned out to be static. Update it accordingly. */
11114 revert_static_member_fn (tree decl)
11117 tree function = TREE_TYPE (decl);
11118 tree args = TYPE_ARG_TYPES (function);
11120 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11121 != TYPE_UNQUALIFIED)
11122 error ("static member function `%#D' declared with type qualifiers",
11125 args = TREE_CHAIN (args);
11126 tmp = build_function_type (TREE_TYPE (function), args);
11127 tmp = build_qualified_type (tmp, cp_type_quals (function));
11128 tmp = build_exception_variant (tmp,
11129 TYPE_RAISES_EXCEPTIONS (function));
11130 TREE_TYPE (decl) = tmp;
11131 if (DECL_ARGUMENTS (decl))
11132 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11133 DECL_STATIC_FUNCTION_P (decl) = 1;
11136 /* Initialize the variables used during compilation of a C++
11140 cxx_push_function_context (struct function * f)
11142 struct language_function *p
11143 = ggc_alloc_cleared (sizeof (struct language_function));
11146 /* Whenever we start a new function, we destroy temporaries in the
11148 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11154 current_function_is_thunk = DECL_THUNK_P (fn);
11156 if (DECL_SAVED_FUNCTION_DATA (fn))
11158 /* If we already parsed this function, and we're just expanding it
11159 now, restore saved state. */
11160 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11162 /* If we decided that we didn't want to inline this function,
11163 make sure the back-end knows that. */
11164 if (!current_function_cannot_inline)
11165 current_function_cannot_inline = cp_function_chain->cannot_inline;
11167 /* We don't need the saved data anymore. Unless this is an inline
11168 function; we need the named return value info for
11169 cp_copy_res_decl_for_inlining. */
11170 if (! DECL_INLINE (fn))
11171 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11176 /* Free the language-specific parts of F, now that we've finished
11177 compiling the function. */
11180 cxx_pop_function_context (struct function * f)
11185 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11186 one of the language-independent trees. */
11188 enum cp_tree_node_structure_enum
11189 cp_tree_node_structure (union lang_tree_node * t)
11191 switch (TREE_CODE (&t->generic))
11193 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11194 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11195 case OVERLOAD: return TS_CP_OVERLOAD;
11196 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11197 case PTRMEM_CST: return TS_CP_PTRMEM;
11198 case BASELINK: return TS_CP_BASELINK;
11199 case WRAPPER: return TS_CP_WRAPPER;
11200 default: return TS_CP_GENERIC;
11204 /* Build the void_list_node (void_type_node having been created). */
11206 build_void_list_node (void)
11208 tree t = build_tree_list (NULL_TREE, void_type_node);
11209 TREE_PARMLIST (t) = 1;
11214 cp_missing_noreturn_ok_p (tree decl)
11216 /* A missing noreturn is ok for the `main' function. */
11217 return DECL_MAIN_P (decl);
11220 #include "gt-cp-decl.h"
11221 #include "gtype-cp.h"