1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus;
100 /* The argument information structure for the function currently being
103 static struct c_arg_info *current_function_arg_info;
105 /* The obstack on which parser and related data structures, which are
106 not live beyond their top-level declaration or definition, are
108 struct obstack parser_obstack;
110 /* The current statement tree. */
112 static GTY(()) struct stmt_tree_s c_stmt_tree;
114 /* State saving variables. */
118 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
119 included in this invocation. Note that the current translation
120 unit is not included in this list. */
122 static GTY(()) tree all_translation_units;
124 /* A list of decls to be made automatically visible in each file scope. */
125 static GTY(()) tree visible_builtins;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* True means global_bindings_p should return false even if the scope stack
152 says we are in file scope. */
153 bool c_override_global_bindings_to_false;
156 /* Each c_binding structure describes one binding of an identifier to
157 a decl. All the decls in a scope - irrespective of namespace - are
158 chained together by the ->prev field, which (as the name implies)
159 runs in reverse order. All the decls in a given namespace bound to
160 a given identifier are chained by the ->shadowed field, which runs
161 from inner to outer scopes.
163 The ->decl field usually points to a DECL node, but there are two
164 exceptions. In the namespace of type tags, the bound entity is a
165 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
166 identifier is encountered, it is bound to error_mark_node to
167 suppress further errors about that identifier in the current
170 The ->type field stores the type of the declaration in this scope;
171 if NULL, the type is the type of the ->decl field. This is only of
172 relevance for objects with external or internal linkage which may
173 be redeclared in inner scopes, forming composite types that only
174 persist for the duration of those scopes. In the external scope,
175 this stores the composite of all the types declared for this
176 object, visible or not. The ->inner_comp field (used only at file
177 scope) stores whether an incomplete array type at file scope was
178 completed at an inner scope to an array size other than 1.
180 The depth field is copied from the scope structure that holds this
181 decl. It is used to preserve the proper ordering of the ->shadowed
182 field (see bind()) and also for a handful of special-case checks.
183 Finally, the invisible bit is true for a decl which should be
184 ignored for purposes of normal name lookup, and the nested bit is
185 true for a decl that's been bound a second time in an inner scope;
186 in all such cases, the binding in the outer scope will have its
187 invisible bit true. */
189 struct c_binding GTY((chain_next ("%h.prev")))
191 tree decl; /* the decl bound */
192 tree type; /* the type in this scope */
193 tree id; /* the identifier it's bound to */
194 struct c_binding *prev; /* the previous decl in this scope */
195 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
196 unsigned int depth : 28; /* depth of this scope */
197 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
198 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
199 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
202 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
203 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
204 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
205 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
207 #define I_SYMBOL_BINDING(node) \
208 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
209 #define I_SYMBOL_DECL(node) \
210 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
212 #define I_TAG_BINDING(node) \
213 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
214 #define I_TAG_DECL(node) \
215 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
217 #define I_LABEL_BINDING(node) \
218 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
219 #define I_LABEL_DECL(node) \
220 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
222 /* Each C symbol points to three linked lists of c_binding structures.
223 These describe the values of the identifier in the three different
224 namespaces defined by the language. */
226 struct lang_identifier GTY(())
228 struct c_common_identifier common_id;
229 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
230 struct c_binding *tag_binding; /* struct/union/enum tags */
231 struct c_binding *label_binding; /* labels */
234 /* Validate c-lang.c's assumptions. */
235 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
236 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
238 /* The resulting tree type. */
241 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)")))
244 union tree_node GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier GTY ((tag ("1"))) identifier;
250 /* Each c_scope structure describes the complete contents of one
251 scope. Four scopes are distinguished specially: the innermost or
252 current scope, the innermost function scope, the file scope (always
253 the second to outermost) and the outermost or external scope.
255 Most declarations are recorded in the current scope.
257 All normal label declarations are recorded in the innermost
258 function scope, as are bindings of undeclared identifiers to
259 error_mark_node. (GCC permits nested functions as an extension,
260 hence the 'innermost' qualifier.) Explicitly declared labels
261 (using the __label__ extension) appear in the current scope.
263 Being in the file scope (current_scope == file_scope) causes
264 special behavior in several places below. Also, under some
265 conditions the Objective-C front end records declarations in the
266 file scope even though that isn't the current scope.
268 All declarations with external linkage are recorded in the external
269 scope, even if they aren't visible there; this models the fact that
270 such declarations are visible to the entire program, and (with a
271 bit of cleverness, see pushdecl) allows diagnosis of some violations
272 of C99 6.2.2p7 and 6.2.7p2:
274 If, within the same translation unit, the same identifier appears
275 with both internal and external linkage, the behavior is
278 All declarations that refer to the same object or function shall
279 have compatible type; otherwise, the behavior is undefined.
281 Initially only the built-in declarations, which describe compiler
282 intrinsic functions plus a subset of the standard library, are in
285 The order of the blocks list matters, and it is frequently appended
286 to. To avoid having to walk all the way to the end of the list on
287 each insertion, or reverse the list later, we maintain a pointer to
288 the last list entry. (FIXME: It should be feasible to use a reversed
291 The bindings list is strictly in reverse order of declarations;
292 pop_scope relies on this. */
295 struct c_scope GTY((chain_next ("%h.outer")))
297 /* The scope containing this one. */
298 struct c_scope *outer;
300 /* The next outermost function scope. */
301 struct c_scope *outer_function;
303 /* All bindings in this scope. */
304 struct c_binding *bindings;
306 /* For each scope (except the global one), a chain of BLOCK nodes
307 for all the scopes that were entered and exited one level down. */
311 /* The depth of this scope. Used to keep the ->shadowed chain of
312 bindings sorted innermost to outermost. */
313 unsigned int depth : 28;
315 /* True if we are currently filling this scope with parameter
317 BOOL_BITFIELD parm_flag : 1;
319 /* True if we already complained about forward parameter decls
320 in this scope. This prevents double warnings on
321 foo (int a; int b; ...) */
322 BOOL_BITFIELD warned_forward_parm_decls : 1;
324 /* True if this is the outermost block scope of a function body.
325 This scope contains the parameters, the local variables declared
326 in the outermost block, and all the labels (except those in
327 nested functions, or declared at block scope with __label__). */
328 BOOL_BITFIELD function_body : 1;
330 /* True means make a BLOCK for this scope no matter what. */
331 BOOL_BITFIELD keep : 1;
334 /* The scope currently in effect. */
336 static GTY(()) struct c_scope *current_scope;
338 /* The innermost function scope. Ordinary (not explicitly declared)
339 labels, bindings to error_mark_node, and the lazily-created
340 bindings of __func__ and its friends get this scope. */
342 static GTY(()) struct c_scope *current_function_scope;
344 /* The C file scope. This is reset for each input translation unit. */
346 static GTY(()) struct c_scope *file_scope;
348 /* The outermost scope. This is used for all declarations with
349 external linkage, and only these, hence the name. */
351 static GTY(()) struct c_scope *external_scope;
353 /* A chain of c_scope structures awaiting reuse. */
355 static GTY((deletable)) struct c_scope *scope_freelist;
357 /* A chain of c_binding structures awaiting reuse. */
359 static GTY((deletable)) struct c_binding *binding_freelist;
361 /* Append VAR to LIST in scope SCOPE. */
362 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
363 struct c_scope *s_ = (scope); \
365 if (s_->list##_last) \
366 TREE_CHAIN (s_->list##_last) = d_; \
369 s_->list##_last = d_; \
372 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
373 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
374 struct c_scope *t_ = (tscope); \
375 struct c_scope *f_ = (fscope); \
377 TREE_CHAIN (t_->to##_last) = f_->from; \
380 t_->to##_last = f_->from##_last; \
383 /* True means unconditionally make a BLOCK for the next scope pushed. */
385 static bool keep_next_level_flag;
387 /* True means the next call to push_scope will be the outermost scope
388 of a function body, so do not push a new scope, merely cease
389 expecting parameter decls. */
391 static bool next_is_function_body;
393 /* Functions called automatically at the beginning and end of execution. */
395 static GTY(()) tree static_ctors;
396 static GTY(()) tree static_dtors;
398 /* Forward declarations. */
399 static tree lookup_name_in_scope (tree, struct c_scope *);
400 static tree c_make_fname_decl (tree, int);
401 static tree grokdeclarator (const struct c_declarator *,
402 struct c_declspecs *,
403 enum decl_context, bool, tree *);
404 static tree grokparms (struct c_arg_info *, bool);
405 static void layout_array_type (tree);
407 /* States indicating how grokdeclarator() should handle declspecs marked
408 with __attribute__((deprecated)). An object declared as
409 __attribute__((deprecated)) suppresses warnings of uses of other
412 enum deprecated_states {
417 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
420 c_print_identifier (FILE *file, tree node, int indent)
422 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
423 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
424 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
425 if (C_IS_RESERVED_WORD (node))
427 tree rid = ridpointers[C_RID_CODE (node)];
428 indent_to (file, indent + 4);
429 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
430 (void *) rid, IDENTIFIER_POINTER (rid));
434 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
435 which may be any of several kinds of DECL or TYPE or error_mark_node,
436 in the scope SCOPE. */
438 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
440 struct c_binding *b, **here;
442 if (binding_freelist)
444 b = binding_freelist;
445 binding_freelist = b->prev;
448 b = GGC_NEW (struct c_binding);
453 b->depth = scope->depth;
454 b->invisible = invisible;
460 b->prev = scope->bindings;
466 switch (TREE_CODE (decl))
468 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
471 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
477 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
483 /* Locate the appropriate place in the chain of shadowed decls
484 to insert this binding. Normally, scope == current_scope and
485 this does nothing. */
486 while (*here && (*here)->depth > scope->depth)
487 here = &(*here)->shadowed;
493 /* Clear the binding structure B, stick it on the binding_freelist,
494 and return the former value of b->prev. This is used by pop_scope
495 and get_parm_info to iterate destructively over all the bindings
496 from a given scope. */
497 static struct c_binding *
498 free_binding_and_advance (struct c_binding *b)
500 struct c_binding *prev = b->prev;
502 memset (b, 0, sizeof (struct c_binding));
503 b->prev = binding_freelist;
504 binding_freelist = b;
510 /* Hook called at end of compilation to assume 1 elt
511 for a file-scope tentative array defn that wasn't complete before. */
514 c_finish_incomplete_decl (tree decl)
516 if (TREE_CODE (decl) == VAR_DECL)
518 tree type = TREE_TYPE (decl);
519 if (type != error_mark_node
520 && TREE_CODE (type) == ARRAY_TYPE
521 && !DECL_EXTERNAL (decl)
522 && TYPE_DOMAIN (type) == 0)
524 warning ("%Jarray %qD assumed to have one element", decl, decl);
526 complete_array_type (type, NULL_TREE, 1);
528 layout_decl (decl, 0);
533 /* The Objective-C front-end often needs to determine the current scope. */
536 objc_get_current_scope (void)
538 return current_scope;
541 /* The following function is used only by Objective-C. It needs to live here
542 because it accesses the innards of c_scope. */
545 objc_mark_locals_volatile (void *enclosing_blk)
547 struct c_scope *scope;
550 for (scope = current_scope;
551 scope && scope != enclosing_blk;
552 scope = scope->outer)
554 for (b = scope->bindings; b; b = b->prev)
556 if (TREE_CODE (b->decl) == VAR_DECL
557 || TREE_CODE (b->decl) == PARM_DECL)
559 C_DECL_REGISTER (b->decl) = 0;
560 DECL_REGISTER (b->decl) = 0;
561 TREE_THIS_VOLATILE (b->decl) = 1;
565 /* Do not climb up past the current function. */
566 if (scope->function_body)
571 /* Nonzero if we are currently in file scope. */
574 global_bindings_p (void)
576 return current_scope == file_scope && !c_override_global_bindings_to_false;
580 keep_next_level (void)
582 keep_next_level_flag = true;
585 /* Identify this scope as currently being filled with parameters. */
588 declare_parm_level (void)
590 current_scope->parm_flag = true;
596 if (next_is_function_body)
598 /* This is the transition from the parameters to the top level
599 of the function body. These are the same scope
600 (C99 6.2.1p4,6) so we do not push another scope structure.
601 next_is_function_body is set only by store_parm_decls, which
602 in turn is called when and only when we are about to
603 encounter the opening curly brace for the function body.
605 The outermost block of a function always gets a BLOCK node,
606 because the debugging output routines expect that each
607 function has at least one BLOCK. */
608 current_scope->parm_flag = false;
609 current_scope->function_body = true;
610 current_scope->keep = true;
611 current_scope->outer_function = current_function_scope;
612 current_function_scope = current_scope;
614 keep_next_level_flag = false;
615 next_is_function_body = false;
619 struct c_scope *scope;
622 scope = scope_freelist;
623 scope_freelist = scope->outer;
626 scope = GGC_CNEW (struct c_scope);
628 scope->keep = keep_next_level_flag;
629 scope->outer = current_scope;
630 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
632 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
634 if (current_scope && scope->depth == 0)
637 sorry ("GCC supports only %u nested scopes", scope->depth);
640 current_scope = scope;
641 keep_next_level_flag = false;
645 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
648 set_type_context (tree type, tree context)
650 for (type = TYPE_MAIN_VARIANT (type); type;
651 type = TYPE_NEXT_VARIANT (type))
652 TYPE_CONTEXT (type) = context;
655 /* Exit a scope. Restore the state of the identifier-decl mappings
656 that were in effect when this scope was entered. Return a BLOCK
657 node containing all the DECLs in this scope that are of interest
658 to debug info generation. */
663 struct c_scope *scope = current_scope;
664 tree block, context, p;
667 bool functionbody = scope->function_body;
668 bool keep = functionbody || scope->keep || scope->bindings;
670 /* If appropriate, create a BLOCK to record the decls for the life
675 block = make_node (BLOCK);
676 BLOCK_SUBBLOCKS (block) = scope->blocks;
677 TREE_USED (block) = 1;
679 /* In each subblock, record that this is its superior. */
680 for (p = scope->blocks; p; p = TREE_CHAIN (p))
681 BLOCK_SUPERCONTEXT (p) = block;
683 BLOCK_VARS (block) = 0;
686 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
687 scope must be set so that they point to the appropriate
688 construct, i.e. either to the current FUNCTION_DECL node, or
689 else to the BLOCK node we just constructed.
691 Note that for tagged types whose scope is just the formal
692 parameter list for some function type specification, we can't
693 properly set their TYPE_CONTEXTs here, because we don't have a
694 pointer to the appropriate FUNCTION_TYPE node readily available
695 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
696 type nodes get set in `grokdeclarator' as soon as we have created
697 the FUNCTION_TYPE node which will represent the "scope" for these
698 "parameter list local" tagged types. */
699 if (scope->function_body)
700 context = current_function_decl;
701 else if (scope == file_scope)
703 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
704 TREE_CHAIN (file_decl) = all_translation_units;
705 all_translation_units = file_decl;
711 /* Clear all bindings in this scope. */
712 for (b = scope->bindings; b; b = free_binding_and_advance (b))
715 switch (TREE_CODE (p))
718 /* Warnings for unused labels, errors for undefined labels. */
719 if (TREE_USED (p) && !DECL_INITIAL (p))
721 error ("%Jlabel %qD used but not defined", p, p);
722 DECL_INITIAL (p) = error_mark_node;
724 else if (!TREE_USED (p) && warn_unused_label)
726 if (DECL_INITIAL (p))
727 warning ("%Jlabel %qD defined but not used", p, p);
729 warning ("%Jlabel %qD declared but not defined", p, p);
731 /* Labels go in BLOCK_VARS. */
732 TREE_CHAIN (p) = BLOCK_VARS (block);
733 BLOCK_VARS (block) = p;
734 gcc_assert (I_LABEL_BINDING (b->id) == b);
735 I_LABEL_BINDING (b->id) = b->shadowed;
741 set_type_context (p, context);
743 /* Types may not have tag-names, in which case the type
744 appears in the bindings list with b->id NULL. */
747 gcc_assert (I_TAG_BINDING (b->id) == b);
748 I_TAG_BINDING (b->id) = b->shadowed;
753 /* Propagate TREE_ADDRESSABLE from nested functions to their
754 containing functions. */
755 if (!TREE_ASM_WRITTEN (p)
756 && DECL_INITIAL (p) != 0
757 && TREE_ADDRESSABLE (p)
758 && DECL_ABSTRACT_ORIGIN (p) != 0
759 && DECL_ABSTRACT_ORIGIN (p) != p)
760 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
764 /* Warnings for unused variables. */
765 if (warn_unused_variable
767 && !DECL_IN_SYSTEM_HEADER (p)
769 && !DECL_ARTIFICIAL (p)
770 && scope != file_scope
771 && scope != external_scope)
772 warning ("%Junused variable %qD", p, p);
776 error ("%Jtype of array %qD completed incompatibly with"
777 " implicit initialization", p, p);
784 /* All of these go in BLOCK_VARS, but only if this is the
785 binding in the home scope. */
788 TREE_CHAIN (p) = BLOCK_VARS (block);
789 BLOCK_VARS (block) = p;
791 /* If this is the file scope, and we are processing more
792 than one translation unit in this compilation, set
793 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
794 This makes same_translation_unit_p work, and causes
795 static declarations to be given disambiguating suffixes. */
796 if (scope == file_scope && num_in_fnames > 1)
798 DECL_CONTEXT (p) = context;
799 if (TREE_CODE (p) == TYPE_DECL)
800 set_type_context (TREE_TYPE (p), context);
804 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
805 already been put there by store_parm_decls. Unused-
806 parameter warnings are handled by function.c.
807 error_mark_node obviously does not go in BLOCK_VARS and
808 does not get unused-variable warnings. */
811 /* It is possible for a decl not to have a name. We get
812 here with b->id NULL in this case. */
815 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
816 I_SYMBOL_BINDING (b->id) = b->shadowed;
817 if (b->shadowed && b->shadowed->type)
818 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
828 /* Dispose of the block that we just made inside some higher level. */
829 if ((scope->function_body || scope == file_scope) && context)
831 DECL_INITIAL (context) = block;
832 BLOCK_SUPERCONTEXT (block) = context;
834 else if (scope->outer)
837 SCOPE_LIST_APPEND (scope->outer, blocks, block);
838 /* If we did not make a block for the scope just exited, any
839 blocks made for inner scopes must be carried forward so they
840 will later become subblocks of something else. */
841 else if (scope->blocks)
842 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
845 /* Pop the current scope, and free the structure for reuse. */
846 current_scope = scope->outer;
847 if (scope->function_body)
848 current_function_scope = scope->outer_function;
850 memset (scope, 0, sizeof (struct c_scope));
851 scope->outer = scope_freelist;
852 scope_freelist = scope;
858 push_file_scope (void)
866 file_scope = current_scope;
868 start_fname_decls ();
870 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
871 bind (DECL_NAME (decl), decl, file_scope,
872 /*invisible=*/false, /*nested=*/true);
876 pop_file_scope (void)
878 /* In case there were missing closebraces, get us back to the global
880 while (current_scope != file_scope)
883 /* __FUNCTION__ is defined at file scope (""). This
884 call may not be necessary as my tests indicate it
885 still works without it. */
886 finish_fname_decls ();
888 /* This is the point to write out a PCH if we're doing that.
889 In that case we do not want to do anything else. */
892 c_common_write_pch ();
896 /* Pop off the file scope and close this translation unit. */
899 cgraph_finalize_compilation_unit ();
902 /* Insert BLOCK at the end of the list of subblocks of the current
903 scope. This is used when a BIND_EXPR is expanded, to handle the
904 BLOCK node inside the BIND_EXPR. */
907 insert_block (tree block)
909 TREE_USED (block) = 1;
910 SCOPE_LIST_APPEND (current_scope, blocks, block);
913 /* Push a definition or a declaration of struct, union or enum tag "name".
914 "type" should be the type node.
915 We assume that the tag "name" is not already defined.
917 Note that the definition may really be just a forward reference.
918 In that case, the TYPE_SIZE will be zero. */
921 pushtag (tree name, tree type)
923 /* Record the identifier as the type's name if it has none. */
924 if (name && !TYPE_NAME (type))
925 TYPE_NAME (type) = name;
926 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
928 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
929 tagged type we just added to the current scope. This fake
930 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
931 to output a representation of a tagged type, and it also gives
932 us a convenient place to record the "scope start" address for the
935 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
937 /* An approximation for now, so we can tell this is a function-scope tag.
938 This will be updated in pop_scope. */
939 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
942 /* Subroutine of compare_decls. Allow harmless mismatches in return
943 and argument types provided that the type modes match. This function
944 return a unified type given a suitable match, and 0 otherwise. */
947 match_builtin_function_types (tree newtype, tree oldtype)
949 tree newrettype, oldrettype;
950 tree newargs, oldargs;
951 tree trytype, tryargs;
953 /* Accept the return type of the new declaration if same modes. */
954 oldrettype = TREE_TYPE (oldtype);
955 newrettype = TREE_TYPE (newtype);
957 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
960 oldargs = TYPE_ARG_TYPES (oldtype);
961 newargs = TYPE_ARG_TYPES (newtype);
964 while (oldargs || newargs)
968 || !TREE_VALUE (oldargs)
969 || !TREE_VALUE (newargs)
970 || TYPE_MODE (TREE_VALUE (oldargs))
971 != TYPE_MODE (TREE_VALUE (newargs)))
974 oldargs = TREE_CHAIN (oldargs);
975 newargs = TREE_CHAIN (newargs);
978 trytype = build_function_type (newrettype, tryargs);
979 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
982 /* Subroutine of diagnose_mismatched_decls. Check for function type
983 mismatch involving an empty arglist vs a nonempty one and give clearer
986 diagnose_arglist_conflict (tree newdecl, tree olddecl,
987 tree newtype, tree oldtype)
991 if (TREE_CODE (olddecl) != FUNCTION_DECL
992 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
993 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
995 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
998 t = TYPE_ARG_TYPES (oldtype);
1000 t = TYPE_ARG_TYPES (newtype);
1001 for (; t; t = TREE_CHAIN (t))
1003 tree type = TREE_VALUE (t);
1005 if (TREE_CHAIN (t) == 0
1006 && TYPE_MAIN_VARIANT (type) != void_type_node)
1008 inform ("a parameter list with an ellipsis can%'t match "
1009 "an empty parameter name list declaration");
1013 if (c_type_promotes_to (type) != type)
1015 inform ("an argument type that has a default promotion can%'t match "
1016 "an empty parameter name list declaration");
1022 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1023 old-style function definition, NEWDECL is a prototype declaration.
1024 Diagnose inconsistencies in the argument list. Returns TRUE if
1025 the prototype is compatible, FALSE if not. */
1027 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1029 tree newargs, oldargs;
1032 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1033 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1035 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1036 newargs = TYPE_ARG_TYPES (newtype);
1041 tree oldargtype = TREE_VALUE (oldargs);
1042 tree newargtype = TREE_VALUE (newargs);
1044 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1047 /* Reaching the end of just one list means the two decls don't
1048 agree on the number of arguments. */
1049 if (END_OF_ARGLIST (oldargtype))
1051 error ("%Jprototype for %qD declares more arguments "
1052 "than previous old-style definition", newdecl, newdecl);
1055 else if (END_OF_ARGLIST (newargtype))
1057 error ("%Jprototype for %qD declares fewer arguments "
1058 "than previous old-style definition", newdecl, newdecl);
1062 /* Type for passing arg must be consistent with that declared
1064 else if (!comptypes (oldargtype, newargtype))
1066 error ("%Jprototype for %qD declares argument %d"
1067 " with incompatible type",
1068 newdecl, newdecl, i);
1072 oldargs = TREE_CHAIN (oldargs);
1073 newargs = TREE_CHAIN (newargs);
1077 /* If we get here, no errors were found, but do issue a warning
1078 for this poor-style construct. */
1079 warning ("%Jprototype for %qD follows non-prototype definition",
1082 #undef END_OF_ARGLIST
1085 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1086 first in a pair of mismatched declarations, using the diagnostic
1089 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1091 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1093 else if (DECL_INITIAL (decl))
1094 diag (N_("%Jprevious definition of %qD was here"), decl, decl);
1095 else if (C_DECL_IMPLICIT (decl))
1096 diag (N_("%Jprevious implicit declaration of %qD was here"), decl, decl);
1098 diag (N_("%Jprevious declaration of %qD was here"), decl, decl);
1101 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1102 Returns true if the caller should proceed to merge the two, false
1103 if OLDDECL should simply be discarded. As a side effect, issues
1104 all necessary diagnostics for invalid or poor-style combinations.
1105 If it returns true, writes the types of NEWDECL and OLDDECL to
1106 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1107 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1110 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1111 tree *newtypep, tree *oldtypep)
1113 tree newtype, oldtype;
1114 bool pedwarned = false;
1115 bool warned = false;
1117 /* If we have error_mark_node for either decl or type, just discard
1118 the previous decl - we're in an error cascade already. */
1119 if (olddecl == error_mark_node || newdecl == error_mark_node)
1121 *oldtypep = oldtype = TREE_TYPE (olddecl);
1122 *newtypep = newtype = TREE_TYPE (newdecl);
1123 if (oldtype == error_mark_node || newtype == error_mark_node)
1126 /* Two different categories of symbol altogether. This is an error
1127 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1128 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1130 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1131 && DECL_BUILT_IN (olddecl)
1132 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1134 error ("%J%qD redeclared as different kind of symbol",
1136 locate_old_decl (olddecl, error);
1138 else if (TREE_PUBLIC (newdecl))
1139 warning ("%Jbuilt-in function %qD declared as non-function",
1141 else if (warn_shadow)
1142 warning ("%Jdeclaration of %qD shadows a built-in function",
1147 /* Enumerators have no linkage, so may only be declared once in a
1149 if (TREE_CODE (olddecl) == CONST_DECL)
1151 error ("%Jredeclaration of enumerator %qD", newdecl, newdecl);
1152 locate_old_decl (olddecl, error);
1156 if (!comptypes (oldtype, newtype))
1158 if (TREE_CODE (olddecl) == FUNCTION_DECL
1159 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1161 /* Accept harmless mismatch in function types.
1162 This is for the ffs and fprintf builtins. */
1163 tree trytype = match_builtin_function_types (newtype, oldtype);
1165 if (trytype && comptypes (newtype, trytype))
1166 *oldtypep = oldtype = trytype;
1169 /* If types don't match for a built-in, throw away the
1170 built-in. No point in calling locate_old_decl here, it
1171 won't print anything. */
1172 warning ("%Jconflicting types for built-in function %qD",
1177 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1178 && DECL_IS_BUILTIN (olddecl))
1180 /* A conflicting function declaration for a predeclared
1181 function that isn't actually built in. Objective C uses
1182 these. The new declaration silently overrides everything
1183 but the volatility (i.e. noreturn) indication. See also
1184 below. FIXME: Make Objective C use normal builtins. */
1185 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1188 /* Permit void foo (...) to match int foo (...) if the latter is
1189 the definition and implicit int was used. See
1190 c-torture/compile/920625-2.c. */
1191 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1192 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1193 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1194 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1196 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1197 /* Make sure we keep void as the return type. */
1198 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1199 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1202 /* Permit void foo (...) to match an earlier call to foo (...) with
1203 no declared type (thus, implicitly int). */
1204 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1205 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1206 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1207 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1209 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1210 /* Make sure we keep void as the return type. */
1211 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1216 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1217 error ("%J conflicting type qualifiers for %qD", newdecl, newdecl);
1219 error ("%Jconflicting types for %qD", newdecl, newdecl);
1220 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1221 locate_old_decl (olddecl, error);
1226 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1227 but silently ignore the redeclaration if either is in a system
1228 header. (Conflicting redeclarations were handled above.) */
1229 if (TREE_CODE (newdecl) == TYPE_DECL)
1231 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1232 return true; /* Allow OLDDECL to continue in use. */
1234 error ("%Jredefinition of typedef %qD", newdecl, newdecl);
1235 locate_old_decl (olddecl, error);
1239 /* Function declarations can either be 'static' or 'extern' (no
1240 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1241 can never conflict with each other on account of linkage (6.2.2p4).
1242 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1243 two definitions if one is 'extern inline' and one is not. The non-
1244 extern-inline definition supersedes the extern-inline definition. */
1245 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1247 /* If you declare a built-in function name as static, or
1248 define the built-in with an old-style definition (so we
1249 can't validate the argument list) the built-in definition is
1250 overridden, but optionally warn this was a bad choice of name. */
1251 if (DECL_BUILT_IN (olddecl)
1252 && !C_DECL_DECLARED_BUILTIN (olddecl)
1253 && (!TREE_PUBLIC (newdecl)
1254 || (DECL_INITIAL (newdecl)
1255 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1258 warning ("%Jdeclaration of %qD shadows a built-in function",
1260 /* Discard the old built-in function. */
1264 if (DECL_INITIAL (newdecl))
1266 if (DECL_INITIAL (olddecl)
1267 && !(DECL_DECLARED_INLINE_P (olddecl)
1268 && DECL_EXTERNAL (olddecl)
1269 && !(DECL_DECLARED_INLINE_P (newdecl)
1270 && DECL_EXTERNAL (newdecl)
1271 && same_translation_unit_p (olddecl, newdecl))))
1273 error ("%Jredefinition of %qD", newdecl, newdecl);
1274 locate_old_decl (olddecl, error);
1278 /* If we have a prototype after an old-style function definition,
1279 the argument types must be checked specially. */
1280 else if (DECL_INITIAL (olddecl)
1281 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1282 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1283 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1285 locate_old_decl (olddecl, error);
1288 /* A non-static declaration (even an "extern") followed by a
1289 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1290 The same is true for a static forward declaration at block
1291 scope followed by a non-static declaration/definition at file
1292 scope. Static followed by non-static at the same scope is
1293 not undefined behavior, and is the most convenient way to get
1294 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1295 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1296 we do diagnose it if -Wtraditional. */
1297 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1299 /* Two exceptions to the rule. If olddecl is an extern
1300 inline, or a predeclared function that isn't actually
1301 built in, newdecl silently overrides olddecl. The latter
1302 occur only in Objective C; see also above. (FIXME: Make
1303 Objective C use normal builtins.) */
1304 if (!DECL_IS_BUILTIN (olddecl)
1305 && !(DECL_EXTERNAL (olddecl)
1306 && DECL_DECLARED_INLINE_P (olddecl)))
1308 error ("%Jstatic declaration of %qD follows "
1309 "non-static declaration", newdecl, newdecl);
1310 locate_old_decl (olddecl, error);
1314 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1316 if (DECL_CONTEXT (olddecl))
1318 error ("%Jnon-static declaration of %qD follows "
1319 "static declaration", newdecl, newdecl);
1320 locate_old_decl (olddecl, error);
1323 else if (warn_traditional)
1325 warning ("%Jnon-static declaration of %qD follows "
1326 "static declaration", newdecl, newdecl);
1331 else if (TREE_CODE (newdecl) == VAR_DECL)
1333 /* Only variables can be thread-local, and all declarations must
1334 agree on this property. */
1335 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1337 if (DECL_THREAD_LOCAL (newdecl))
1338 error ("%Jthread-local declaration of %qD follows "
1339 "non-thread-local declaration", newdecl, newdecl);
1341 error ("%Jnon-thread-local declaration of %qD follows "
1342 "thread-local declaration", newdecl, newdecl);
1344 locate_old_decl (olddecl, error);
1348 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1349 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1351 error ("%Jredefinition of %qD", newdecl, newdecl);
1352 locate_old_decl (olddecl, error);
1356 /* Objects declared at file scope: if the first declaration had
1357 external linkage (even if it was an external reference) the
1358 second must have external linkage as well, or the behavior is
1359 undefined. If the first declaration had internal linkage, then
1360 the second must too, or else be an external reference (in which
1361 case the composite declaration still has internal linkage).
1362 As for function declarations, we warn about the static-then-
1363 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1364 if (DECL_FILE_SCOPE_P (newdecl)
1365 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1367 if (DECL_EXTERNAL (newdecl))
1369 if (!DECL_FILE_SCOPE_P (olddecl))
1371 error ("%Jextern declaration of %qD follows "
1372 "declaration with no linkage", newdecl, newdecl);
1373 locate_old_decl (olddecl, error);
1376 else if (warn_traditional)
1378 warning ("%Jnon-static declaration of %qD follows "
1379 "static declaration", newdecl, newdecl);
1385 if (TREE_PUBLIC (newdecl))
1386 error ("%Jnon-static declaration of %qD follows "
1387 "static declaration", newdecl, newdecl);
1389 error ("%Jstatic declaration of %qD follows "
1390 "non-static declaration", newdecl, newdecl);
1392 locate_old_decl (olddecl, error);
1396 /* Two objects with the same name declared at the same block
1397 scope must both be external references (6.7p3). */
1398 else if (!DECL_FILE_SCOPE_P (newdecl))
1400 if (DECL_EXTERNAL (newdecl))
1402 /* Extern with initializer at block scope, which will
1403 already have received an error. */
1405 else if (DECL_EXTERNAL (olddecl))
1407 error ("%Jdeclaration of %qD with no linkage follows "
1408 "extern declaration", newdecl, newdecl);
1409 locate_old_decl (olddecl, error);
1413 error ("%Jredeclaration of %qD with no linkage",
1415 locate_old_decl (olddecl, error);
1423 /* All decls must agree on a visibility. */
1424 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1425 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1427 warning ("%Jredeclaration of %qD with different visibility "
1428 "(old visibility preserved)", newdecl, newdecl);
1432 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1434 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1435 if (DECL_DECLARED_INLINE_P (newdecl)
1436 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1438 warning ("%Jinline declaration of %qD follows "
1439 "declaration with attribute noinline", newdecl, newdecl);
1442 else if (DECL_DECLARED_INLINE_P (olddecl)
1443 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1445 warning ("%Jdeclaration of %qD with attribute noinline follows "
1446 "inline declaration ", newdecl, newdecl);
1450 /* Inline declaration after use or definition.
1451 ??? Should we still warn about this now we have unit-at-a-time
1452 mode and can get it right?
1453 Definitely don't complain if the decls are in different translation
1455 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1456 && same_translation_unit_p (olddecl, newdecl))
1458 if (TREE_USED (olddecl))
1460 warning ("%J%qD declared inline after being called",
1464 else if (DECL_INITIAL (olddecl))
1466 warning ("%J%qD declared inline after its definition",
1472 else /* PARM_DECL, VAR_DECL */
1474 /* Redeclaration of a parameter is a constraint violation (this is
1475 not explicitly stated, but follows from C99 6.7p3 [no more than
1476 one declaration of the same identifier with no linkage in the
1477 same scope, except type tags] and 6.2.2p6 [parameters have no
1478 linkage]). We must check for a forward parameter declaration,
1479 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1480 an extension, the mandatory diagnostic for which is handled by
1481 mark_forward_parm_decls. */
1483 if (TREE_CODE (newdecl) == PARM_DECL
1484 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1486 error ("%Jredefinition of parameter %qD", newdecl, newdecl);
1487 locate_old_decl (olddecl, error);
1492 /* Optional warning for completely redundant decls. */
1493 if (!warned && !pedwarned
1494 && warn_redundant_decls
1495 /* Don't warn about a function declaration followed by a
1497 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1498 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1499 /* Don't warn about redundant redeclarations of builtins. */
1500 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1501 && !DECL_BUILT_IN (newdecl)
1502 && DECL_BUILT_IN (olddecl)
1503 && !C_DECL_DECLARED_BUILTIN (olddecl))
1504 /* Don't warn about an extern followed by a definition. */
1505 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1506 /* Don't warn about forward parameter decls. */
1507 && !(TREE_CODE (newdecl) == PARM_DECL
1508 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1510 warning ("%Jredundant redeclaration of %qD", newdecl, newdecl);
1514 /* Report location of previous decl/defn in a consistent manner. */
1515 if (warned || pedwarned)
1516 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1521 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1522 consistent with OLDDECL, but carries new information. Merge the
1523 new information into OLDDECL. This function issues no
1527 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1529 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1530 && DECL_INITIAL (newdecl) != 0);
1532 /* For real parm decl following a forward decl, rechain the old decl
1533 in its new location and clear TREE_ASM_WRITTEN (it's not a
1534 forward decl anymore). */
1535 if (TREE_CODE (newdecl) == PARM_DECL
1536 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1538 struct c_binding *b, **here;
1540 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1541 if ((*here)->decl == olddecl)
1548 b->prev = current_scope->bindings;
1549 current_scope->bindings = b;
1551 TREE_ASM_WRITTEN (olddecl) = 0;
1554 DECL_ATTRIBUTES (newdecl)
1555 = targetm.merge_decl_attributes (olddecl, newdecl);
1557 /* Merge the data types specified in the two decls. */
1559 = TREE_TYPE (olddecl)
1560 = composite_type (newtype, oldtype);
1562 /* Lay the type out, unless already done. */
1563 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1565 if (TREE_TYPE (newdecl) != error_mark_node)
1566 layout_type (TREE_TYPE (newdecl));
1567 if (TREE_CODE (newdecl) != FUNCTION_DECL
1568 && TREE_CODE (newdecl) != TYPE_DECL
1569 && TREE_CODE (newdecl) != CONST_DECL)
1570 layout_decl (newdecl, 0);
1574 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1575 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1576 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1577 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1578 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1579 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1581 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1582 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1586 /* Keep the old rtl since we can safely use it. */
1587 COPY_DECL_RTL (olddecl, newdecl);
1589 /* Merge the type qualifiers. */
1590 if (TREE_READONLY (newdecl))
1591 TREE_READONLY (olddecl) = 1;
1593 if (TREE_THIS_VOLATILE (newdecl))
1595 TREE_THIS_VOLATILE (olddecl) = 1;
1596 if (TREE_CODE (newdecl) == VAR_DECL)
1597 make_var_volatile (newdecl);
1600 /* Merge deprecatedness. */
1601 if (TREE_DEPRECATED (newdecl))
1602 TREE_DEPRECATED (olddecl) = 1;
1604 /* Keep source location of definition rather than declaration. */
1605 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1606 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1608 /* Merge the unused-warning information. */
1609 if (DECL_IN_SYSTEM_HEADER (olddecl))
1610 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1611 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1612 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1614 /* Merge the initialization information. */
1615 if (DECL_INITIAL (newdecl) == 0)
1616 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1618 /* Merge the section attribute.
1619 We want to issue an error if the sections conflict but that must be
1620 done later in decl_attributes since we are called before attributes
1622 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1623 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1625 /* Copy the assembler name.
1626 Currently, it can only be defined in the prototype. */
1627 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1629 /* Use visibility of whichever declaration had it specified */
1630 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1632 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1633 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1636 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1638 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1639 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1640 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1641 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1642 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1643 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1644 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1645 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1646 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1649 /* Merge the storage class information. */
1650 merge_weak (newdecl, olddecl);
1652 /* For functions, static overrides non-static. */
1653 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1655 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1656 /* This is since we don't automatically
1657 copy the attributes of NEWDECL into OLDDECL. */
1658 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1659 /* If this clears `static', clear it in the identifier too. */
1660 if (!TREE_PUBLIC (olddecl))
1661 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1663 if (DECL_EXTERNAL (newdecl))
1665 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1666 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1668 /* An extern decl does not override previous storage class. */
1669 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1670 if (!DECL_EXTERNAL (newdecl))
1672 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1673 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1678 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1679 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1682 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1684 /* If we're redefining a function previously defined as extern
1685 inline, make sure we emit debug info for the inline before we
1686 throw it away, in case it was inlined into a function that hasn't
1687 been written out yet. */
1688 if (new_is_definition && DECL_INITIAL (olddecl))
1690 if (TREE_USED (olddecl)
1691 /* In unit-at-a-time mode we never inline re-defined extern
1692 inline functions. */
1693 && !flag_unit_at_a_time
1694 && cgraph_function_possibly_inlined_p (olddecl))
1695 (*debug_hooks->outlining_inline_function) (olddecl);
1697 /* The new defn must not be inline. */
1698 DECL_INLINE (newdecl) = 0;
1699 DECL_UNINLINABLE (newdecl) = 1;
1703 /* If either decl says `inline', this fn is inline,
1704 unless its definition was passed already. */
1705 if (DECL_DECLARED_INLINE_P (newdecl)
1706 || DECL_DECLARED_INLINE_P (olddecl))
1707 DECL_DECLARED_INLINE_P (newdecl) = 1;
1709 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1710 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1713 if (DECL_BUILT_IN (olddecl))
1715 /* If redeclaring a builtin function, it stays built in.
1716 But it gets tagged as having been declared. */
1717 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1718 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1719 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1722 /* Also preserve various other info from the definition. */
1723 if (!new_is_definition)
1725 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1726 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1727 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1728 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1729 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1731 /* Set DECL_INLINE on the declaration if we've got a body
1732 from which to instantiate. */
1733 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1735 DECL_INLINE (newdecl) = 1;
1736 DECL_ABSTRACT_ORIGIN (newdecl)
1737 = DECL_ABSTRACT_ORIGIN (olddecl);
1742 /* If a previous declaration said inline, mark the
1743 definition as inlinable. */
1744 if (DECL_DECLARED_INLINE_P (newdecl)
1745 && !DECL_UNINLINABLE (newdecl))
1746 DECL_INLINE (newdecl) = 1;
1750 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1751 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1753 unsigned olddecl_uid = DECL_UID (olddecl);
1754 tree olddecl_context = DECL_CONTEXT (olddecl);
1756 memcpy ((char *) olddecl + sizeof (struct tree_common),
1757 (char *) newdecl + sizeof (struct tree_common),
1758 sizeof (struct tree_decl) - sizeof (struct tree_common));
1759 DECL_UID (olddecl) = olddecl_uid;
1760 DECL_CONTEXT (olddecl) = olddecl_context;
1763 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1764 so that encode_section_info has a chance to look at the new decl
1765 flags and attributes. */
1766 if (DECL_RTL_SET_P (olddecl)
1767 && (TREE_CODE (olddecl) == FUNCTION_DECL
1768 || (TREE_CODE (olddecl) == VAR_DECL
1769 && TREE_STATIC (olddecl))))
1770 make_decl_rtl (olddecl);
1773 /* Handle when a new declaration NEWDECL has the same name as an old
1774 one OLDDECL in the same binding contour. Prints an error message
1777 If safely possible, alter OLDDECL to look like NEWDECL, and return
1778 true. Otherwise, return false. */
1781 duplicate_decls (tree newdecl, tree olddecl)
1783 tree newtype = NULL, oldtype = NULL;
1785 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1788 merge_decls (newdecl, olddecl, newtype, oldtype);
1793 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1795 warn_if_shadowing (tree new_decl)
1797 struct c_binding *b;
1799 /* Shadow warnings wanted? */
1801 /* No shadow warnings for internally generated vars. */
1802 || DECL_IS_BUILTIN (new_decl)
1803 /* No shadow warnings for vars made for inlining. */
1804 || DECL_FROM_INLINE (new_decl)
1805 /* Don't warn about the parm names in function declarator
1806 within a function declarator. It would be nice to avoid
1807 warning in any function declarator in a declaration, as
1808 opposed to a definition, but there is no way to tell
1809 it's not a definition at this point. */
1810 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1813 /* Is anything being shadowed? Invisible decls do not count. */
1814 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1815 if (b->decl && b->decl != new_decl && !b->invisible)
1817 tree old_decl = b->decl;
1819 if (TREE_CODE (old_decl) == PARM_DECL)
1820 warning ("%Jdeclaration of %qD shadows a parameter",
1821 new_decl, new_decl);
1822 else if (DECL_FILE_SCOPE_P (old_decl))
1823 warning ("%Jdeclaration of %qD shadows a global declaration",
1824 new_decl, new_decl);
1825 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1826 && DECL_BUILT_IN (old_decl))
1827 warning ("%Jdeclaration of %qD shadows a built-in function",
1828 new_decl, new_decl);
1830 warning ("%Jdeclaration of %qD shadows a previous local",
1831 new_decl, new_decl);
1833 if (TREE_CODE (old_decl) != FUNCTION_DECL
1834 || !DECL_BUILT_IN (old_decl))
1835 warning ("%Jshadowed declaration is here", old_decl);
1842 /* Subroutine of pushdecl.
1844 X is a TYPE_DECL for a typedef statement. Create a brand new
1845 ..._TYPE node (which will be just a variant of the existing
1846 ..._TYPE node with identical properties) and then install X
1847 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1849 The whole point here is to end up with a situation where each
1850 and every ..._TYPE node the compiler creates will be uniquely
1851 associated with AT MOST one node representing a typedef name.
1852 This way, even though the compiler substitutes corresponding
1853 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1854 early on, later parts of the compiler can always do the reverse
1855 translation and get back the corresponding typedef name. For
1858 typedef struct S MY_TYPE;
1861 Later parts of the compiler might only know that `object' was of
1862 type `struct S' if it were not for code just below. With this
1863 code however, later parts of the compiler see something like:
1865 struct S' == struct S
1866 typedef struct S' MY_TYPE;
1869 And they can then deduce (from the node for type struct S') that
1870 the original object declaration was:
1874 Being able to do this is important for proper support of protoize,
1875 and also for generating precise symbolic debugging information
1876 which takes full account of the programmer's (typedef) vocabulary.
1878 Obviously, we don't want to generate a duplicate ..._TYPE node if
1879 the TYPE_DECL node that we are now processing really represents a
1880 standard built-in type.
1882 Since all standard types are effectively declared at line zero
1883 in the source file, we can easily check to see if we are working
1884 on a standard type by checking the current value of lineno. */
1887 clone_underlying_type (tree x)
1889 if (DECL_IS_BUILTIN (x))
1891 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1892 TYPE_NAME (TREE_TYPE (x)) = x;
1894 else if (TREE_TYPE (x) != error_mark_node
1895 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1897 tree tt = TREE_TYPE (x);
1898 DECL_ORIGINAL_TYPE (x) = tt;
1899 tt = build_variant_type_copy (tt);
1901 TREE_USED (tt) = TREE_USED (x);
1906 /* Record a decl-node X as belonging to the current lexical scope.
1907 Check for errors (such as an incompatible declaration for the same
1908 name already seen in the same scope).
1910 Returns either X or an old decl for the same name.
1911 If an old decl is returned, it may have been smashed
1912 to agree with what X says. */
1917 tree name = DECL_NAME (x);
1918 struct c_scope *scope = current_scope;
1919 struct c_binding *b;
1920 bool nested = false;
1922 /* Functions need the lang_decl data. */
1923 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
1924 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1926 /* Must set DECL_CONTEXT for everything not at file scope or
1927 DECL_FILE_SCOPE_P won't work. Local externs don't count
1928 unless they have initializers (which generate code). */
1929 if (current_function_decl
1930 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1931 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1932 DECL_CONTEXT (x) = current_function_decl;
1934 /* Anonymous decls are just inserted in the scope. */
1937 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1941 /* First, see if there is another declaration with the same name in
1942 the current scope. If there is, duplicate_decls may do all the
1943 work for us. If duplicate_decls returns false, that indicates
1944 two incompatible decls in the same scope; we are to silently
1945 replace the old one (duplicate_decls has issued all appropriate
1946 diagnostics). In particular, we should not consider possible
1947 duplicates in the external scope, or shadowing. */
1948 b = I_SYMBOL_BINDING (name);
1949 if (b && B_IN_SCOPE (b, scope))
1951 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
1952 && COMPLETE_TYPE_P (TREE_TYPE (x)))
1953 b->inner_comp = false;
1954 if (duplicate_decls (x, b->decl))
1957 goto skip_external_and_shadow_checks;
1960 /* All declarations with external linkage, and all external
1961 references, go in the external scope, no matter what scope is
1962 current. However, the binding in that scope is ignored for
1963 purposes of normal name lookup. A separate binding structure is
1964 created in the requested scope; this governs the normal
1965 visibility of the symbol.
1967 The binding in the externals scope is used exclusively for
1968 detecting duplicate declarations of the same object, no matter
1969 what scope they are in; this is what we do here. (C99 6.2.7p2:
1970 All declarations that refer to the same object or function shall
1971 have compatible type; otherwise, the behavior is undefined.) */
1972 if (DECL_EXTERNAL (x) || scope == file_scope)
1974 tree type = TREE_TYPE (x);
1977 bool type_saved = false;
1978 if (b && !B_IN_EXTERNAL_SCOPE (b)
1979 && (TREE_CODE (b->decl) == FUNCTION_DECL
1980 || TREE_CODE (b->decl) == VAR_DECL)
1981 && DECL_FILE_SCOPE_P (b->decl))
1984 vistype = TREE_TYPE (visdecl);
1986 if (warn_nested_externs
1987 && scope != file_scope
1988 && !DECL_IN_SYSTEM_HEADER (x))
1989 warning ("nested extern declaration of %qD", x);
1991 while (b && !B_IN_EXTERNAL_SCOPE (b))
1993 /* If this decl might be modified, save its type. This is
1994 done here rather than when the decl is first bound
1995 because the type may change after first binding, through
1996 being completed or through attributes being added. If we
1997 encounter multiple such decls, only the first should have
1998 its type saved; the others will already have had their
1999 proper types saved and the types will not have changed as
2000 their scopes will not have been re-entered. */
2001 if (DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2003 b->type = TREE_TYPE (b->decl);
2006 if (B_IN_FILE_SCOPE (b)
2007 && TREE_CODE (b->decl) == VAR_DECL
2008 && TREE_STATIC (b->decl)
2009 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2010 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2011 && TREE_CODE (type) == ARRAY_TYPE
2012 && TYPE_DOMAIN (type)
2013 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2014 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2016 /* Array type completed in inner scope, which should be
2017 diagnosed if the completion does not have size 1 and
2018 it does not get completed in the file scope. */
2019 b->inner_comp = true;
2024 /* If a matching external declaration has been found, set its
2025 type to the composite of all the types of that declaration.
2026 After the consistency checks, it will be reset to the
2027 composite of the visible types only. */
2028 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2030 TREE_TYPE (b->decl) = b->type;
2032 /* The point of the same_translation_unit_p check here is,
2033 we want to detect a duplicate decl for a construct like
2034 foo() { extern bar(); } ... static bar(); but not if
2035 they are in different translation units. In any case,
2036 the static does not go in the externals scope. */
2038 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2039 && duplicate_decls (x, b->decl))
2042 thistype = (vistype ? composite_type (vistype, type) : type);
2043 b->type = TREE_TYPE (b->decl);
2044 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2046 = build_type_attribute_variant (thistype,
2047 TYPE_ATTRIBUTES (b->type));
2048 TREE_TYPE (b->decl) = thistype;
2049 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2052 else if (TREE_PUBLIC (x))
2054 if (visdecl && !b && duplicate_decls (x, visdecl))
2056 /* An external declaration at block scope referring to a
2057 visible entity with internal linkage. The composite
2058 type will already be correct for this scope, so we
2059 just need to fall through to make the declaration in
2066 bind (name, x, external_scope, /*invisible=*/true,
2072 /* Similarly, a declaration of a function with static linkage at
2073 block scope must be checked against any existing declaration
2074 of that function at file scope. */
2075 else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
2076 && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
2078 if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
2079 warning ("nested static declaration of %qD", x);
2081 while (b && !B_IN_FILE_SCOPE (b))
2084 if (b && same_translation_unit_p (x, b->decl)
2085 && duplicate_decls (x, b->decl))
2087 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2092 bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
2097 warn_if_shadowing (x);
2099 skip_external_and_shadow_checks:
2100 if (TREE_CODE (x) == TYPE_DECL)
2101 clone_underlying_type (x);
2103 bind (name, x, scope, /*invisible=*/false, nested);
2105 /* If x's type is incomplete because it's based on a
2106 structure or union which has not yet been fully declared,
2107 attach it to that structure or union type, so we can go
2108 back and complete the variable declaration later, if the
2109 structure or union gets fully declared.
2111 If the input is erroneous, we can have error_mark in the type
2112 slot (e.g. "f(void a, ...)") - that doesn't count as an
2114 if (TREE_TYPE (x) != error_mark_node
2115 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2117 tree element = TREE_TYPE (x);
2119 while (TREE_CODE (element) == ARRAY_TYPE)
2120 element = TREE_TYPE (element);
2121 element = TYPE_MAIN_VARIANT (element);
2123 if ((TREE_CODE (element) == RECORD_TYPE
2124 || TREE_CODE (element) == UNION_TYPE)
2125 && (TREE_CODE (x) != TYPE_DECL
2126 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2127 && !COMPLETE_TYPE_P (element))
2128 C_TYPE_INCOMPLETE_VARS (element)
2129 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2134 /* Record X as belonging to file scope.
2135 This is used only internally by the Objective-C front end,
2136 and is limited to its needs. duplicate_decls is not called;
2137 if there is any preexisting decl for this identifier, it is an ICE. */
2140 pushdecl_top_level (tree x)
2143 bool nested = false;
2144 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2146 name = DECL_NAME (x);
2148 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2150 if (TREE_PUBLIC (x))
2152 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2156 bind (name, x, file_scope, /*invisible=*/false, nested);
2162 implicit_decl_warning (tree id, tree olddecl)
2164 void (*diag) (const char *, ...);
2165 switch (mesg_implicit_function_declaration)
2168 case 1: diag = warning; break;
2169 case 2: diag = error; break;
2170 default: gcc_unreachable ();
2173 diag (N_("implicit declaration of function %qE"), id);
2175 locate_old_decl (olddecl, diag);
2178 /* Generate an implicit declaration for identifier FUNCTIONID as a
2179 function of type int (). */
2182 implicitly_declare (tree functionid)
2184 struct c_binding *b;
2188 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2190 if (B_IN_SCOPE (b, external_scope))
2199 /* FIXME: Objective-C has weird not-really-builtin functions
2200 which are supposed to be visible automatically. They wind up
2201 in the external scope because they're pushed before the file
2202 scope gets created. Catch this here and rebind them into the
2204 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2206 bind (functionid, decl, file_scope,
2207 /*invisible=*/false, /*nested=*/true);
2212 tree newtype = default_function_type;
2214 TREE_TYPE (decl) = b->type;
2215 /* Implicit declaration of a function already declared
2216 (somehow) in a different scope, or as a built-in.
2217 If this is the first time this has happened, warn;
2218 then recycle the old declaration but with the new type. */
2219 if (!C_DECL_IMPLICIT (decl))
2221 implicit_decl_warning (functionid, decl);
2222 C_DECL_IMPLICIT (decl) = 1;
2224 if (DECL_BUILT_IN (decl))
2226 newtype = build_type_attribute_variant (newtype,
2228 (TREE_TYPE (decl)));
2229 if (!comptypes (newtype, TREE_TYPE (decl)))
2231 warning ("incompatible implicit declaration of built-in"
2232 " function %qD", decl);
2233 newtype = TREE_TYPE (decl);
2238 if (!comptypes (newtype, TREE_TYPE (decl)))
2240 error ("incompatible implicit declaration of function %qD",
2242 locate_old_decl (decl, error);
2245 b->type = TREE_TYPE (decl);
2246 TREE_TYPE (decl) = newtype;
2247 bind (functionid, decl, current_scope,
2248 /*invisible=*/false, /*nested=*/true);
2253 /* Not seen before. */
2254 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2255 DECL_EXTERNAL (decl) = 1;
2256 TREE_PUBLIC (decl) = 1;
2257 C_DECL_IMPLICIT (decl) = 1;
2258 implicit_decl_warning (functionid, 0);
2259 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2261 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2263 /* C89 says implicit declarations are in the innermost block.
2264 So we record the decl in the standard fashion. */
2265 decl = pushdecl (decl);
2267 /* No need to call objc_check_decl here - it's a function type. */
2268 rest_of_decl_compilation (decl, 0, 0);
2270 /* Write a record describing this implicit function declaration
2271 to the prototypes file (if requested). */
2272 gen_aux_info_record (decl, 0, 1, 0);
2274 /* Possibly apply some default attributes to this implicit declaration. */
2275 decl_attributes (&decl, NULL_TREE, 0);
2280 /* Issue an error message for a reference to an undeclared variable
2281 ID, including a reference to a builtin outside of function-call
2282 context. Establish a binding of the identifier to error_mark_node
2283 in an appropriate scope, which will suppress further errors for the
2286 undeclared_variable (tree id)
2288 static bool already = false;
2289 struct c_scope *scope;
2291 if (current_function_decl == 0)
2293 error ("%qE undeclared here (not in a function)", id);
2294 scope = current_scope;
2298 error ("%qE undeclared (first use in this function)", id);
2302 error ("(Each undeclared identifier is reported only once");
2303 error ("for each function it appears in.)");
2307 /* If we are parsing old-style parameter decls, current_function_decl
2308 will be nonnull but current_function_scope will be null. */
2309 scope = current_function_scope ? current_function_scope : current_scope;
2311 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2314 /* Subroutine of lookup_label, declare_label, define_label: construct a
2315 LABEL_DECL with all the proper frills. */
2318 make_label (tree name, location_t location)
2320 tree label = build_decl (LABEL_DECL, name, void_type_node);
2322 DECL_CONTEXT (label) = current_function_decl;
2323 DECL_MODE (label) = VOIDmode;
2324 DECL_SOURCE_LOCATION (label) = location;
2329 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2330 Create one if none exists so far for the current function.
2331 This is called when a label is used in a goto expression or
2332 has its address taken. */
2335 lookup_label (tree name)
2339 if (current_function_decl == 0)
2341 error ("label %qs referenced outside of any function",
2342 IDENTIFIER_POINTER (name));
2346 /* Use a label already defined or ref'd with this name, but not if
2347 it is inherited from a containing function and wasn't declared
2349 label = I_LABEL_DECL (name);
2350 if (label && (DECL_CONTEXT (label) == current_function_decl
2351 || C_DECLARED_LABEL_FLAG (label)))
2353 /* If the label has only been declared, update its apparent
2354 location to point here, for better diagnostics if it
2355 turns out not to have been defined. */
2356 if (!TREE_USED (label))
2357 DECL_SOURCE_LOCATION (label) = input_location;
2361 /* No label binding for that identifier; make one. */
2362 label = make_label (name, input_location);
2364 /* Ordinary labels go in the current function scope. */
2365 bind (name, label, current_function_scope,
2366 /*invisible=*/false, /*nested=*/false);
2370 /* Make a label named NAME in the current function, shadowing silently
2371 any that may be inherited from containing functions or containing
2372 scopes. This is called for __label__ declarations. */
2375 declare_label (tree name)
2377 struct c_binding *b = I_LABEL_BINDING (name);
2380 /* Check to make sure that the label hasn't already been declared
2382 if (b && B_IN_CURRENT_SCOPE (b))
2384 error ("duplicate label declaration %qs", IDENTIFIER_POINTER (name));
2385 locate_old_decl (b->decl, error);
2387 /* Just use the previous declaration. */
2391 label = make_label (name, input_location);
2392 C_DECLARED_LABEL_FLAG (label) = 1;
2394 /* Declared labels go in the current scope. */
2395 bind (name, label, current_scope,
2396 /*invisible=*/false, /*nested=*/false);
2400 /* Define a label, specifying the location in the source file.
2401 Return the LABEL_DECL node for the label, if the definition is valid.
2402 Otherwise return 0. */
2405 define_label (location_t location, tree name)
2407 /* Find any preexisting label with this name. It is an error
2408 if that label has already been defined in this function, or
2409 if there is a containing function with a declared label with
2411 tree label = I_LABEL_DECL (name);
2414 && ((DECL_CONTEXT (label) == current_function_decl
2415 && DECL_INITIAL (label) != 0)
2416 || (DECL_CONTEXT (label) != current_function_decl
2417 && C_DECLARED_LABEL_FLAG (label))))
2419 error ("%Hduplicate label %qD", &location, label);
2420 locate_old_decl (label, error);
2423 else if (label && DECL_CONTEXT (label) == current_function_decl)
2425 /* The label has been used or declared already in this function,
2426 but not defined. Update its location to point to this
2428 DECL_SOURCE_LOCATION (label) = location;
2432 /* No label binding for that identifier; make one. */
2433 label = make_label (name, location);
2435 /* Ordinary labels go in the current function scope. */
2436 bind (name, label, current_function_scope,
2437 /*invisible=*/false, /*nested=*/false);
2440 if (warn_traditional && !in_system_header && lookup_name (name))
2441 warning ("%Htraditional C lacks a separate namespace for labels, "
2442 "identifier %qs conflicts", &location,
2443 IDENTIFIER_POINTER (name));
2445 /* Mark label as having been defined. */
2446 DECL_INITIAL (label) = error_mark_node;
2450 /* Given NAME, an IDENTIFIER_NODE,
2451 return the structure (or union or enum) definition for that name.
2452 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2453 CODE says which kind of type the caller wants;
2454 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2455 If the wrong kind of type is found, an error is reported. */
2458 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2460 struct c_binding *b = I_TAG_BINDING (name);
2466 /* We only care about whether it's in this level if
2467 thislevel_only was set or it might be a type clash. */
2468 if (thislevel_only || TREE_CODE (b->decl) != code)
2470 /* For our purposes, a tag in the external scope is the same as
2471 a tag in the file scope. (Primarily relevant to Objective-C
2472 and its builtin structure tags, which get pushed before the
2473 file scope is created.) */
2474 if (B_IN_CURRENT_SCOPE (b)
2475 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2479 if (thislevel_only && !thislevel)
2482 if (TREE_CODE (b->decl) != code)
2484 /* Definition isn't the kind we were looking for. */
2485 pending_invalid_xref = name;
2486 pending_invalid_xref_location = input_location;
2488 /* If in the same binding level as a declaration as a tag
2489 of a different type, this must not be allowed to
2490 shadow that tag, so give the error immediately.
2491 (For example, "struct foo; union foo;" is invalid.) */
2493 pending_xref_error ();
2498 /* Print an error message now
2499 for a recent invalid struct, union or enum cross reference.
2500 We don't print them immediately because they are not invalid
2501 when used in the `struct foo;' construct for shadowing. */
2504 pending_xref_error (void)
2506 if (pending_invalid_xref != 0)
2507 error ("%H%qs defined as wrong kind of tag",
2508 &pending_invalid_xref_location,
2509 IDENTIFIER_POINTER (pending_invalid_xref));
2510 pending_invalid_xref = 0;
2514 /* Look up NAME in the current scope and its superiors
2515 in the namespace of variables, functions and typedefs.
2516 Return a ..._DECL node of some kind representing its definition,
2517 or return 0 if it is undefined. */
2520 lookup_name (tree name)
2522 struct c_binding *b = I_SYMBOL_BINDING (name);
2523 if (b && !b->invisible)
2528 /* Similar to `lookup_name' but look only at the indicated scope. */
2531 lookup_name_in_scope (tree name, struct c_scope *scope)
2533 struct c_binding *b;
2535 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2536 if (B_IN_SCOPE (b, scope))
2541 /* Create the predefined scalar types of C,
2542 and some nodes representing standard constants (0, 1, (void *) 0).
2543 Initialize the global scope.
2544 Make definitions for built-in primitive functions. */
2547 c_init_decl_processing (void)
2550 tree ptr_ftype_void, ptr_ftype_ptr;
2551 location_t save_loc = input_location;
2553 /* Adds some ggc roots, and reserved words for c-parse.in. */
2556 current_function_decl = 0;
2558 gcc_obstack_init (&parser_obstack);
2560 /* Make the externals scope. */
2562 external_scope = current_scope;
2564 /* Declarations from c_common_nodes_and_builtins must not be associated
2565 with this input file, lest we get differences between using and not
2566 using preprocessed headers. */
2567 #ifdef USE_MAPPED_LOCATION
2568 input_location = BUILTINS_LOCATION;
2570 input_location.file = "<built-in>";
2571 input_location.line = 0;
2574 build_common_tree_nodes (flag_signed_char, false);
2576 c_common_nodes_and_builtins ();
2578 /* In C, comparisons and TRUTH_* expressions have type int. */
2579 truthvalue_type_node = integer_type_node;
2580 truthvalue_true_node = integer_one_node;
2581 truthvalue_false_node = integer_zero_node;
2583 /* Even in C99, which has a real boolean type. */
2584 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2585 boolean_type_node));
2587 endlink = void_list_node;
2588 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2590 = build_function_type (ptr_type_node,
2591 tree_cons (NULL_TREE, ptr_type_node, endlink));
2593 input_location = save_loc;
2595 pedantic_lvalues = true;
2597 make_fname_decl = c_make_fname_decl;
2598 start_fname_decls ();
2601 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2602 decl, NAME is the initialization string and TYPE_DEP indicates whether
2603 NAME depended on the type of the function. As we don't yet implement
2604 delayed emission of static data, we mark the decl as emitted
2605 so it is not placed in the output. Anything using it must therefore pull
2606 out the STRING_CST initializer directly. FIXME. */
2609 c_make_fname_decl (tree id, int type_dep)
2611 const char *name = fname_as_string (type_dep);
2612 tree decl, type, init;
2613 size_t length = strlen (name);
2615 type = build_array_type
2616 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2617 build_index_type (size_int (length)));
2619 decl = build_decl (VAR_DECL, id, type);
2621 TREE_STATIC (decl) = 1;
2622 TREE_READONLY (decl) = 1;
2623 DECL_ARTIFICIAL (decl) = 1;
2625 init = build_string (length + 1, name);
2626 free ((char *) name);
2627 TREE_TYPE (init) = type;
2628 DECL_INITIAL (decl) = init;
2630 TREE_USED (decl) = 1;
2632 if (current_function_decl)
2634 DECL_CONTEXT (decl) = current_function_decl;
2635 bind (id, decl, current_function_scope,
2636 /*invisible=*/false, /*nested=*/false);
2639 finish_decl (decl, init, NULL_TREE);
2644 /* Return a definition for a builtin function named NAME and whose data type
2645 is TYPE. TYPE should be a function type with argument types.
2646 FUNCTION_CODE tells later passes how to compile calls to this function.
2647 See tree.h for its possible values.
2649 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2650 the name to be called if we can't opencode the function. If
2651 ATTRS is nonzero, use that for the function's attribute list. */
2654 builtin_function (const char *name, tree type, int function_code,
2655 enum built_in_class cl, const char *library_name,
2658 tree id = get_identifier (name);
2659 tree decl = build_decl (FUNCTION_DECL, id, type);
2660 TREE_PUBLIC (decl) = 1;
2661 DECL_EXTERNAL (decl) = 1;
2662 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2663 DECL_BUILT_IN_CLASS (decl) = cl;
2664 DECL_FUNCTION_CODE (decl) = function_code;
2666 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2668 /* Should never be called on a symbol with a preexisting meaning. */
2669 gcc_assert (!I_SYMBOL_BINDING (id));
2671 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2673 /* Builtins in the implementation namespace are made visible without
2674 needing to be explicitly declared. See push_file_scope. */
2675 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2677 TREE_CHAIN (decl) = visible_builtins;
2678 visible_builtins = decl;
2681 /* Possibly apply some default attributes to this built-in function. */
2683 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2685 decl_attributes (&decl, NULL_TREE, 0);
2690 /* Called when a declaration is seen that contains no names to declare.
2691 If its type is a reference to a structure, union or enum inherited
2692 from a containing scope, shadow that tag name for the current scope
2693 with a forward reference.
2694 If its type defines a new named structure or union
2695 or defines an enum, it is valid but we need not do anything here.
2696 Otherwise, it is an error. */
2699 shadow_tag (const struct c_declspecs *declspecs)
2701 shadow_tag_warned (declspecs, 0);
2704 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2707 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2709 bool found_tag = false;
2711 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2713 tree value = declspecs->type;
2714 enum tree_code code = TREE_CODE (value);
2716 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2717 /* Used to test also that TYPE_SIZE (value) != 0.
2718 That caused warning for `struct foo;' at top level in the file. */
2720 tree name = TYPE_NAME (value);
2727 if (warned != 1 && code != ENUMERAL_TYPE)
2728 /* Empty unnamed enum OK */
2730 pedwarn ("unnamed struct/union that defines no instances");
2734 else if (!declspecs->tag_defined_p
2735 && declspecs->storage_class != csc_none)
2738 pedwarn ("empty declaration with storage class specifier "
2739 "does not redeclare tag");
2741 pending_xref_error ();
2743 else if (!declspecs->tag_defined_p
2744 && (declspecs->const_p
2745 || declspecs->volatile_p
2746 || declspecs->restrict_p))
2749 pedwarn ("empty declaration with type qualifier "
2750 "does not redeclare tag");
2752 pending_xref_error ();
2756 pending_invalid_xref = 0;
2757 t = lookup_tag (code, name, 1);
2761 t = make_node (code);
2768 if (warned != 1 && !in_system_header)
2770 pedwarn ("useless type name in empty declaration");
2775 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2777 pedwarn ("useless type name in empty declaration");
2781 pending_invalid_xref = 0;
2783 if (declspecs->inline_p)
2785 error ("%<inline%> in empty declaration");
2789 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2791 error ("%<auto%> in file-scope empty declaration");
2795 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2797 error ("%<register%> in file-scope empty declaration");
2801 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2803 warning ("useless storage class specifier in empty declaration");
2807 if (!warned && !in_system_header && declspecs->thread_p)
2809 warning ("useless %<__thread%> in empty declaration");
2813 if (!warned && !in_system_header && (declspecs->const_p
2814 || declspecs->volatile_p
2815 || declspecs->restrict_p))
2817 warning ("useless type qualifier in empty declaration");
2824 pedwarn ("empty declaration");
2829 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2830 bits. SPECS represents declaration specifiers that the grammar
2831 only permits to contain type qualifiers and attributes. */
2834 quals_from_declspecs (const struct c_declspecs *specs)
2836 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2837 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2838 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2839 gcc_assert (!specs->type
2840 && !specs->decl_attr
2841 && specs->typespec_word == cts_none
2842 && specs->storage_class == csc_none
2843 && !specs->typedef_p
2844 && !specs->explicit_signed_p
2845 && !specs->deprecated_p
2847 && !specs->long_long_p
2850 && !specs->unsigned_p
2851 && !specs->complex_p
2853 && !specs->thread_p);
2857 /* Construct an array declarator. EXPR is the expression inside [], or
2858 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2859 to the pointer to which a parameter array is converted). STATIC_P is
2860 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2861 is true if the array is [*], a VLA of unspecified length which is
2862 nevertheless a complete type (not currently implemented by GCC),
2863 false otherwise. The field for the contained declarator is left to be
2864 filled in by set_array_declarator_inner. */
2866 struct c_declarator *
2867 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2870 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2871 struct c_declarator);
2872 declarator->kind = cdk_array;
2873 declarator->declarator = 0;
2874 declarator->u.array.dimen = expr;
2877 declarator->u.array.attrs = quals->attrs;
2878 declarator->u.array.quals = quals_from_declspecs (quals);
2882 declarator->u.array.attrs = NULL_TREE;
2883 declarator->u.array.quals = 0;
2885 declarator->u.array.static_p = static_p;
2886 declarator->u.array.vla_unspec_p = vla_unspec_p;
2887 if (pedantic && !flag_isoc99)
2889 if (static_p || quals != NULL)
2890 pedwarn ("ISO C90 does not support %<static%> or type "
2891 "qualifiers in parameter array declarators");
2893 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2896 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2900 /* Set the contained declarator of an array declarator. DECL is the
2901 declarator, as constructed by build_array_declarator; INNER is what
2902 appears on the left of the []. ABSTRACT_P is true if it is an
2903 abstract declarator, false otherwise; this is used to reject static
2904 and type qualifiers in abstract declarators, where they are not in
2905 the C99 grammar (subject to possible change in DR#289). */
2907 struct c_declarator *
2908 set_array_declarator_inner (struct c_declarator *decl,
2909 struct c_declarator *inner, bool abstract_p)
2911 decl->declarator = inner;
2912 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
2913 || decl->u.array.attrs != NULL_TREE
2914 || decl->u.array.static_p))
2915 error ("static or type qualifiers in abstract declarator");
2919 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2922 groktypename (struct c_type_name *type_name)
2925 tree attrs = type_name->specs->attrs;
2927 type_name->specs->attrs = NULL_TREE;
2929 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2932 /* Apply attributes. */
2933 decl_attributes (&type, attrs, 0);
2938 /* Decode a declarator in an ordinary declaration or data definition.
2939 This is called as soon as the type information and variable name
2940 have been parsed, before parsing the initializer if any.
2941 Here we create the ..._DECL node, fill in its type,
2942 and put it on the list of decls for the current context.
2943 The ..._DECL node is returned as the value.
2945 Exception: for arrays where the length is not specified,
2946 the type is left null, to be filled in by `finish_decl'.
2948 Function definitions do not come here; they go to start_function
2949 instead. However, external and forward declarations of functions
2950 do go through here. Structure field declarations are done by
2951 grokfield and not through here. */
2954 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2955 bool initialized, tree attributes)
2960 /* An object declared as __attribute__((deprecated)) suppresses
2961 warnings of uses of other deprecated items. */
2962 if (lookup_attribute ("deprecated", attributes))
2963 deprecated_state = DEPRECATED_SUPPRESS;
2965 decl = grokdeclarator (declarator, declspecs,
2966 NORMAL, initialized, NULL);
2968 deprecated_state = DEPRECATED_NORMAL;
2970 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2971 && MAIN_NAME_P (DECL_NAME (decl)))
2972 warning ("%J%qD is usually a function", decl, decl);
2975 /* Is it valid for this decl to have an initializer at all?
2976 If not, set INITIALIZED to zero, which will indirectly
2977 tell 'finish_decl' to ignore the initializer once it is parsed. */
2978 switch (TREE_CODE (decl))
2981 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
2986 error ("function %qD is initialized like a variable", decl);
2991 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2992 error ("parameter %qD is initialized", decl);
2997 /* Don't allow initializations for incomplete types except for
2998 arrays which might be completed by the initialization. */
3000 /* This can happen if the array size is an undefined macro.
3001 We already gave a warning, so we don't need another one. */
3002 if (TREE_TYPE (decl) == error_mark_node)
3004 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3006 /* A complete type is ok if size is fixed. */
3008 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3009 || C_DECL_VARIABLE_SIZE (decl))
3011 error ("variable-sized object may not be initialized");
3015 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3017 error ("variable %qD has initializer but incomplete type", decl);
3020 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3022 error ("elements of array %qD have incomplete type", decl);
3025 else if (C_DECL_VARIABLE_SIZE (decl))
3027 /* Although C99 is unclear about whether incomplete arrays
3028 of VLAs themselves count as VLAs, it does not make
3029 sense to permit them to be initialized given that
3030 ordinary VLAs may not be initialized. */
3031 error ("variable-sized object may not be initialized");
3038 if (current_scope == file_scope)
3039 TREE_STATIC (decl) = 1;
3041 /* Tell 'pushdecl' this is an initialized decl
3042 even though we don't yet have the initializer expression.
3043 Also tell 'finish_decl' it may store the real initializer. */
3044 DECL_INITIAL (decl) = error_mark_node;
3047 /* If this is a function declaration, write a record describing it to the
3048 prototypes file (if requested). */
3050 if (TREE_CODE (decl) == FUNCTION_DECL)
3051 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3053 /* ANSI specifies that a tentative definition which is not merged with
3054 a non-tentative definition behaves exactly like a definition with an
3055 initializer equal to zero. (Section 3.7.2)
3057 -fno-common gives strict ANSI behavior, though this tends to break
3058 a large body of code that grew up without this rule.
3060 Thread-local variables are never common, since there's no entrenched
3061 body of code to break, and it allows more efficient variable references
3062 in the presence of dynamic linking. */
3064 if (TREE_CODE (decl) == VAR_DECL
3066 && TREE_PUBLIC (decl)
3067 && !DECL_THREAD_LOCAL (decl)
3069 DECL_COMMON (decl) = 1;
3071 /* Set attributes here so if duplicate decl, will have proper attributes. */
3072 decl_attributes (&decl, attributes, 0);
3074 if (TREE_CODE (decl) == FUNCTION_DECL
3075 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3077 struct c_declarator *ce = declarator;
3079 if (ce->kind == cdk_pointer)
3080 ce = declarator->declarator;
3081 if (ce->kind == cdk_function)
3083 tree args = ce->u.arg_info->parms;
3084 for (; args; args = TREE_CHAIN (args))
3086 tree type = TREE_TYPE (args);
3087 if (type && INTEGRAL_TYPE_P (type)
3088 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3089 DECL_ARG_TYPE (args) = integer_type_node;
3094 if (TREE_CODE (decl) == FUNCTION_DECL
3095 && DECL_DECLARED_INLINE_P (decl)
3096 && DECL_UNINLINABLE (decl)
3097 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3098 warning ("%Jinline function %qD given attribute noinline", decl, decl);
3100 /* Add this decl to the current scope.
3101 TEM may equal DECL or it may be a previous decl of the same name. */
3102 tem = pushdecl (decl);
3104 if (initialized && DECL_EXTERNAL (tem))
3106 DECL_EXTERNAL (tem) = 0;
3107 TREE_STATIC (tem) = 1;
3113 /* Finish processing of a declaration;
3114 install its initial value.
3115 If the length of an array type is not known before,
3116 it must be determined now, from the initial value, or it is an error. */
3119 finish_decl (tree decl, tree init, tree asmspec_tree)
3121 tree type = TREE_TYPE (decl);
3122 int was_incomplete = (DECL_SIZE (decl) == 0);
3123 const char *asmspec = 0;
3125 /* If a name was specified, get the string. */
3126 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3127 && DECL_FILE_SCOPE_P (decl))
3128 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3130 asmspec = TREE_STRING_POINTER (asmspec_tree);
3132 /* If `start_decl' didn't like having an initialization, ignore it now. */
3133 if (init != 0 && DECL_INITIAL (decl) == 0)
3136 /* Don't crash if parm is initialized. */
3137 if (TREE_CODE (decl) == PARM_DECL)
3141 store_init_value (decl, init);
3143 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3144 || TREE_CODE (decl) == FUNCTION_DECL
3145 || TREE_CODE (decl) == FIELD_DECL))
3146 objc_check_decl (decl);
3148 /* Deduce size of array from initialization, if not already known. */
3149 if (TREE_CODE (type) == ARRAY_TYPE
3150 && TYPE_DOMAIN (type) == 0
3151 && TREE_CODE (decl) != TYPE_DECL)
3154 = (TREE_STATIC (decl)
3155 /* Even if pedantic, an external linkage array
3156 may have incomplete type at first. */
3157 ? pedantic && !TREE_PUBLIC (decl)
3158 : !DECL_EXTERNAL (decl));
3160 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3162 /* Get the completed type made by complete_array_type. */
3163 type = TREE_TYPE (decl);
3166 error ("%Jinitializer fails to determine size of %qD", decl, decl);
3168 else if (failure == 2)
3171 error ("%Jarray size missing in %qD", decl, decl);
3172 /* If a `static' var's size isn't known,
3173 make it extern as well as static, so it does not get
3175 If it is not `static', then do not mark extern;
3176 finish_incomplete_decl will give it a default size
3177 and it will get allocated. */
3178 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3179 DECL_EXTERNAL (decl) = 1;
3182 /* TYPE_MAX_VALUE is always one less than the number of elements
3183 in the array, because we start counting at zero. Therefore,
3184 warn only if the value is less than zero. */
3185 else if (pedantic && TYPE_DOMAIN (type) != 0
3186 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3187 error ("%Jzero or negative size array %qD", decl, decl);
3189 layout_decl (decl, 0);
3192 if (TREE_CODE (decl) == VAR_DECL)
3194 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3195 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3196 layout_decl (decl, 0);
3198 if (DECL_SIZE (decl) == 0
3199 /* Don't give an error if we already gave one earlier. */
3200 && TREE_TYPE (decl) != error_mark_node
3201 && (TREE_STATIC (decl)
3202 /* A static variable with an incomplete type
3203 is an error if it is initialized.
3204 Also if it is not file scope.
3205 Otherwise, let it through, but if it is not `extern'
3206 then it may cause an error message later. */
3207 ? (DECL_INITIAL (decl) != 0
3208 || !DECL_FILE_SCOPE_P (decl))
3209 /* An automatic variable with an incomplete type
3211 : !DECL_EXTERNAL (decl)))
3213 error ("%Jstorage size of %qD isn%'t known", decl, decl);
3214 TREE_TYPE (decl) = error_mark_node;
3217 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3218 && DECL_SIZE (decl) != 0)
3220 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3221 constant_expression_warning (DECL_SIZE (decl));
3223 error ("%Jstorage size of %qD isn%'t constant", decl, decl);
3226 if (TREE_USED (type))
3227 TREE_USED (decl) = 1;
3230 /* If this is a function and an assembler name is specified, reset DECL_RTL
3231 so we can give it its new name. Also, update built_in_decls if it
3232 was a normal built-in. */
3233 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3235 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3237 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
3238 set_user_assembler_name (builtin, asmspec);
3239 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
3240 init_block_move_fn (asmspec);
3241 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
3242 init_block_clear_fn (asmspec);
3244 set_user_assembler_name (decl, asmspec);
3247 /* If #pragma weak was used, mark the decl weak now. */
3248 if (current_scope == file_scope)
3249 maybe_apply_pragma_weak (decl);
3251 /* If this is a variable definition, determine its ELF visibility. */
3252 if (TREE_CODE (decl) == VAR_DECL
3253 && TREE_STATIC (decl)
3254 && !DECL_EXTERNAL (decl))
3255 c_determine_visibility (decl);
3257 /* Output the assembler code and/or RTL code for variables and functions,
3258 unless the type is an undefined structure or union.
3259 If not, it will get done when the type is completed. */
3261 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3263 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3264 if (c_dialect_objc ())
3265 objc_check_decl (decl);
3269 /* If this is not a static variable, issue a warning.
3270 It doesn't make any sense to give an ASMSPEC for an
3271 ordinary, non-register local variable. Historically,
3272 GCC has accepted -- but ignored -- the ASMSPEC in
3274 if (!DECL_FILE_SCOPE_P (decl)
3275 && TREE_CODE (decl) == VAR_DECL
3276 && !C_DECL_REGISTER (decl)
3277 && !TREE_STATIC (decl))
3278 warning ("%Jignoring asm-specifier for non-static local "
3279 "variable %qD", decl, decl);
3280 else if (C_DECL_REGISTER (decl))
3281 change_decl_assembler_name (decl, get_identifier (asmspec));
3283 set_user_assembler_name (decl, asmspec);
3286 if (DECL_FILE_SCOPE_P (decl))
3288 if (DECL_INITIAL (decl) == NULL_TREE
3289 || DECL_INITIAL (decl) == error_mark_node)
3290 /* Don't output anything
3291 when a tentative file-scope definition is seen.
3292 But at end of compilation, do output code for them. */
3293 DECL_DEFER_OUTPUT (decl) = 1;
3294 rest_of_decl_compilation (decl, true, 0);
3298 /* In conjunction with an ASMSPEC, the `register'
3299 keyword indicates that we should place the variable
3300 in a particular register. */
3301 if (asmspec && C_DECL_REGISTER (decl))
3303 DECL_HARD_REGISTER (decl) = 1;
3304 /* This cannot be done for a structure with volatile
3305 fields, on which DECL_REGISTER will have been
3307 if (!DECL_REGISTER (decl))
3308 error ("cannot put object with volatile field into register");
3311 if (TREE_CODE (decl) != FUNCTION_DECL)
3313 /* If we're building a variable sized type, and we might be
3314 reachable other than via the top of the current binding
3315 level, then create a new BIND_EXPR so that we deallocate
3316 the object at the right time. */
3317 /* Note that DECL_SIZE can be null due to errors. */
3318 if (DECL_SIZE (decl)
3319 && !TREE_CONSTANT (DECL_SIZE (decl))
3320 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3323 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3324 TREE_SIDE_EFFECTS (bind) = 1;
3326 BIND_EXPR_BODY (bind) = push_stmt_list ();
3328 add_stmt (build_stmt (DECL_EXPR, decl));
3333 if (!DECL_FILE_SCOPE_P (decl))
3335 /* Recompute the RTL of a local array now
3336 if it used to be an incomplete type. */
3338 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3340 /* If we used it already as memory, it must stay in memory. */
3341 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3342 /* If it's still incomplete now, no init will save it. */
3343 if (DECL_SIZE (decl) == 0)
3344 DECL_INITIAL (decl) = 0;
3349 /* If this was marked 'used', be sure it will be output. */
3350 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3351 mark_decl_referenced (decl);
3353 if (TREE_CODE (decl) == TYPE_DECL)
3355 if (!DECL_FILE_SCOPE_P (decl)
3356 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3357 add_stmt (build_stmt (DECL_EXPR, decl));
3359 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3362 /* At the end of a declaration, throw away any variable type sizes
3363 of types defined inside that declaration. There is no use
3364 computing them in the following function definition. */
3365 if (current_scope == file_scope)
3366 get_pending_sizes ();
3368 /* Install a cleanup (aka destructor) if one was given. */
3369 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3371 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3374 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3375 tree cleanup_decl = lookup_name (cleanup_id);
3378 /* Build "cleanup(&decl)" for the destructor. */
3379 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3380 cleanup = build_tree_list (NULL_TREE, cleanup);
3381 cleanup = build_function_call (cleanup_decl, cleanup);
3383 /* Don't warn about decl unused; the cleanup uses it. */
3384 TREE_USED (decl) = 1;
3385 TREE_USED (cleanup_decl) = 1;
3387 /* Initialize EH, if we've been told to do so. */
3388 if (flag_exceptions && !c_eh_initialized_p)
3390 c_eh_initialized_p = true;
3391 eh_personality_libfunc
3392 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3393 ? "__gcc_personality_sj0"
3394 : "__gcc_personality_v0");
3395 using_eh_for_cleanups ();
3398 push_cleanup (decl, cleanup, false);
3403 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3406 grokparm (const struct c_parm *parm)
3408 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3411 decl_attributes (&decl, parm->attrs, 0);
3416 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3417 and push that on the current scope. */
3420 push_parm_decl (const struct c_parm *parm)
3424 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3425 decl_attributes (&decl, parm->attrs, 0);
3427 decl = pushdecl (decl);
3429 finish_decl (decl, NULL_TREE, NULL_TREE);
3432 /* Mark all the parameter declarations to date as forward decls.
3433 Also diagnose use of this extension. */
3436 mark_forward_parm_decls (void)
3438 struct c_binding *b;
3440 if (pedantic && !current_scope->warned_forward_parm_decls)
3442 pedwarn ("ISO C forbids forward parameter declarations");
3443 current_scope->warned_forward_parm_decls = true;
3446 for (b = current_scope->bindings; b; b = b->prev)
3447 if (TREE_CODE (b->decl) == PARM_DECL)
3448 TREE_ASM_WRITTEN (b->decl) = 1;
3451 static GTY(()) int compound_literal_number;
3453 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3454 literal, which may be an incomplete array type completed by the
3455 initializer; INIT is a CONSTRUCTOR that initializes the compound
3459 build_compound_literal (tree type, tree init)
3461 /* We do not use start_decl here because we have a type, not a declarator;
3462 and do not use finish_decl because the decl should be stored inside
3463 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3468 if (type == error_mark_node)
3469 return error_mark_node;
3471 decl = build_decl (VAR_DECL, NULL_TREE, type);
3472 DECL_EXTERNAL (decl) = 0;
3473 TREE_PUBLIC (decl) = 0;
3474 TREE_STATIC (decl) = (current_scope == file_scope);
3475 DECL_CONTEXT (decl) = current_function_decl;
3476 TREE_USED (decl) = 1;
3477 TREE_TYPE (decl) = type;
3478 TREE_READONLY (decl) = TYPE_READONLY (type);
3479 store_init_value (decl, init);
3481 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3483 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3485 gcc_assert (!failure);
3488 type = TREE_TYPE (decl);
3489 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3490 return error_mark_node;
3492 stmt = build_stmt (DECL_EXPR, decl);
3493 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3494 TREE_SIDE_EFFECTS (complit) = 1;
3496 layout_decl (decl, 0);
3498 if (TREE_STATIC (decl))
3500 /* This decl needs a name for the assembler output. We also need
3501 a unique suffix to be added to the name. */
3504 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3505 compound_literal_number);
3506 compound_literal_number++;
3507 DECL_NAME (decl) = get_identifier (name);
3508 DECL_DEFER_OUTPUT (decl) = 1;
3509 DECL_COMDAT (decl) = 1;
3510 DECL_ARTIFICIAL (decl) = 1;
3512 rest_of_decl_compilation (decl, 1, 0);
3518 /* Make TYPE a complete type based on INITIAL_VALUE.
3519 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3520 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3523 complete_array_type (tree type, tree initial_value, int do_default)
3525 tree maxindex = NULL_TREE;
3530 /* Note MAXINDEX is really the maximum index,
3531 one less than the size. */
3532 if (TREE_CODE (initial_value) == STRING_CST)
3535 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3536 maxindex = build_int_cst (NULL_TREE,
3537 (TREE_STRING_LENGTH (initial_value)
3540 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3542 tree elts = CONSTRUCTOR_ELTS (initial_value);
3543 maxindex = build_int_cst (NULL_TREE, -1);
3544 for (; elts; elts = TREE_CHAIN (elts))
3546 if (TREE_PURPOSE (elts))
3547 maxindex = TREE_PURPOSE (elts);
3549 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3550 maxindex, integer_one_node));
3555 /* Make an error message unless that happened already. */
3556 if (initial_value != error_mark_node)
3559 /* Prevent further error messages. */
3560 maxindex = build_int_cst (NULL_TREE, 0);
3567 maxindex = build_int_cst (NULL_TREE, 0);
3573 TYPE_DOMAIN (type) = build_index_type (maxindex);
3575 gcc_assert (TREE_TYPE (maxindex));
3578 /* Lay out the type now that we can get the real answer. */
3585 /* Determine whether TYPE is a structure with a flexible array member,
3586 or a union containing such a structure (possibly recursively). */
3589 flexible_array_type_p (tree type)
3592 switch (TREE_CODE (type))
3595 x = TYPE_FIELDS (type);
3598 while (TREE_CHAIN (x) != NULL_TREE)
3600 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3601 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3602 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3603 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3607 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3609 if (flexible_array_type_p (TREE_TYPE (x)))
3618 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3619 replacing with appropriate values if they are invalid. */
3621 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3624 unsigned int max_width;
3625 unsigned HOST_WIDE_INT w;
3626 const char *name = orig_name ? orig_name: _("<anonymous>");
3629 STRIP_NOPS (*width);
3631 /* Detect and ignore out of range field width and process valid
3633 if (TREE_CODE (*width) != INTEGER_CST)
3635 error ("bit-field %qs width not an integer constant", name);
3636 *width = integer_one_node;
3640 constant_expression_warning (*width);
3641 if (tree_int_cst_sgn (*width) < 0)
3643 error ("negative width in bit-field %qs", name);
3644 *width = integer_one_node;
3646 else if (integer_zerop (*width) && orig_name)
3648 error ("zero width for bit-field %qs", name);
3649 *width = integer_one_node;
3653 /* Detect invalid bit-field type. */
3654 if (TREE_CODE (*type) != INTEGER_TYPE
3655 && TREE_CODE (*type) != BOOLEAN_TYPE
3656 && TREE_CODE (*type) != ENUMERAL_TYPE)
3658 error ("bit-field %qs has invalid type", name);
3659 *type = unsigned_type_node;
3662 type_mv = TYPE_MAIN_VARIANT (*type);
3664 && type_mv != integer_type_node
3665 && type_mv != unsigned_type_node
3666 && type_mv != boolean_type_node)
3667 pedwarn ("type of bit-field %qs is a GCC extension", name);
3669 if (type_mv == boolean_type_node)
3670 max_width = CHAR_TYPE_SIZE;
3672 max_width = TYPE_PRECISION (*type);
3674 if (0 < compare_tree_int (*width, max_width))
3676 error ("width of %qs exceeds its type", name);
3678 *width = build_int_cst (NULL_TREE, w);
3681 w = tree_low_cst (*width, 1);
3683 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3685 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3687 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3688 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3689 warning ("%qs is narrower than values of its type", name);
3693 /* Given declspecs and a declarator,
3694 determine the name and type of the object declared
3695 and construct a ..._DECL node for it.
3696 (In one case we can return a ..._TYPE node instead.
3697 For invalid input we sometimes return 0.)
3699 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3701 DECL_CONTEXT says which syntactic context this declaration is in:
3702 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3703 FUNCDEF for a function definition. Like NORMAL but a few different
3704 error messages in each case. Return value may be zero meaning
3705 this definition is too screwy to try to parse.
3706 PARM for a parameter declaration (either within a function prototype
3707 or before a function body). Make a PARM_DECL, or return void_type_node.
3708 TYPENAME if for a typename (in a cast or sizeof).
3709 Don't make a DECL node; just return the ..._TYPE node.
3710 FIELD for a struct or union field; make a FIELD_DECL.
3711 INITIALIZED is true if the decl has an initializer.
3712 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3713 representing the width of the bit-field.
3715 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3716 It may also be so in the PARM case, for a prototype where the
3717 argument type is specified but not the name.
3719 This function is where the complicated C meanings of `static'
3720 and `extern' are interpreted. */
3723 grokdeclarator (const struct c_declarator *declarator,
3724 struct c_declspecs *declspecs,
3725 enum decl_context decl_context, bool initialized, tree *width)
3727 tree type = declspecs->type;
3728 bool threadp = declspecs->thread_p;
3729 enum c_storage_class storage_class = declspecs->storage_class;
3733 int type_quals = TYPE_UNQUALIFIED;
3734 const char *name, *orig_name;
3735 tree typedef_type = 0;
3736 int funcdef_flag = 0;
3737 bool funcdef_syntax = false;
3738 int size_varies = 0;
3739 tree decl_attr = declspecs->decl_attr;
3740 int array_ptr_quals = TYPE_UNQUALIFIED;
3741 tree array_ptr_attrs = NULL_TREE;
3742 int array_parm_static = 0;
3743 tree returned_attrs = NULL_TREE;
3744 bool bitfield = width != NULL;
3746 struct c_arg_info *arg_info = 0;
3748 if (decl_context == FUNCDEF)
3749 funcdef_flag = 1, decl_context = NORMAL;
3751 /* Look inside a declarator for the name being declared
3752 and get it as a string, for an error message. */
3754 const struct c_declarator *decl = declarator;
3763 funcdef_syntax = (decl->kind == cdk_function);
3764 decl = decl->declarator;
3768 decl = decl->declarator;
3773 name = IDENTIFIER_POINTER (decl->u.id);
3785 /* A function definition's declarator must have the form of
3786 a function declarator. */
3788 if (funcdef_flag && !funcdef_syntax)
3791 /* If this looks like a function definition, make it one,
3792 even if it occurs where parms are expected.
3793 Then store_parm_decls will reject it and not use it as a parm. */
3794 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3795 decl_context = PARM;
3797 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3798 warn_deprecated_use (declspecs->type);
3800 typedef_type = type;
3801 size_varies = C_TYPE_VARIABLE_SIZE (type);
3803 /* Diagnose defaulting to "int". */
3805 if (declspecs->default_int_p && !in_system_header)
3807 /* Issue a warning if this is an ISO C 99 program or if
3808 -Wreturn-type and this is a function, or if -Wimplicit;
3809 prefer the former warning since it is more explicit. */
3810 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3812 warn_about_return_type = 1;
3813 else if (warn_implicit_int || flag_isoc99)
3814 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3817 /* Adjust the type if a bit-field is being declared,
3818 -funsigned-bitfields applied and the type is not explicitly
3820 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3821 && TREE_CODE (type) == INTEGER_TYPE)
3822 type = c_common_unsigned_type (type);
3824 /* Figure out the type qualifiers for the declaration. There are
3825 two ways a declaration can become qualified. One is something
3826 like `const int i' where the `const' is explicit. Another is
3827 something like `typedef const int CI; CI i' where the type of the
3828 declaration contains the `const'. A third possibility is that
3829 there is a type qualifier on the element type of a typedefed
3830 array type, in which case we should extract that qualifier so
3831 that c_apply_type_quals_to_decls receives the full list of
3832 qualifiers to work with (C90 is not entirely clear about whether
3833 duplicate qualifiers should be diagnosed in this case, but it
3834 seems most appropriate to do so). */
3835 element_type = strip_array_types (type);
3836 constp = declspecs->const_p + TYPE_READONLY (element_type);
3837 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3838 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3839 if (pedantic && !flag_isoc99)
3842 pedwarn ("duplicate %<const%>");
3844 pedwarn ("duplicate %<restrict%>");
3846 pedwarn ("duplicate %<volatile%>");
3848 if (!flag_gen_aux_info && (TYPE_QUALS (type)))
3849 type = TYPE_MAIN_VARIANT (type);
3850 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3851 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3852 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3854 /* Warn about storage classes that are invalid for certain
3855 kinds of declarations (parameters, typenames, etc.). */
3859 || storage_class == csc_auto
3860 || storage_class == csc_register
3861 || storage_class == csc_typedef))
3863 if (storage_class == csc_auto
3864 && (pedantic || current_scope == file_scope))
3865 pedwarn ("function definition declared %<auto%>");
3866 if (storage_class == csc_register)
3867 error ("function definition declared %<register%>");
3868 if (storage_class == csc_typedef)
3869 error ("function definition declared %<typedef%>");
3871 error ("function definition declared %<__thread%>");
3873 if (storage_class == csc_auto
3874 || storage_class == csc_register
3875 || storage_class == csc_typedef)
3876 storage_class = csc_none;
3878 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3880 if (decl_context == PARM && storage_class == csc_register)
3884 switch (decl_context)
3887 error ("storage class specified for structure field %qs",
3891 error ("storage class specified for parameter %qs", name);
3894 error ("storage class specified for typename");
3897 storage_class = csc_none;
3901 else if (storage_class == csc_extern
3905 /* 'extern' with initialization is invalid if not at file scope. */
3906 if (current_scope == file_scope)
3907 warning ("%qs initialized and declared %<extern%>", name);
3909 error ("%qs has both %<extern%> and initializer", name);
3911 else if (current_scope == file_scope)
3913 if (storage_class == csc_auto)
3914 error ("file-scope declaration of %qs specifies %<auto%>", name);
3915 if (pedantic && storage_class == csc_register)
3916 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3920 if (storage_class == csc_extern && funcdef_flag)
3921 error ("nested function %qs declared %<extern%>", name);
3922 else if (threadp && storage_class == csc_none)
3924 error ("function-scope %qs implicitly auto and declared "
3931 /* Now figure out the structure of the declarator proper.
3932 Descend through it, creating more complex types, until we reach
3933 the declared identifier (or NULL_TREE, in an absolute declarator). */
3935 while (declarator && declarator->kind != cdk_id)
3937 if (type == error_mark_node)
3939 declarator = declarator->declarator;
3943 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3944 a cdk_pointer (for *...),
3945 a cdk_function (for ...(...)),
3946 a cdk_attrs (for nested attributes),
3947 or a cdk_id (for the name being declared
3948 or the place in an absolute declarator
3949 where the name was omitted).
3950 For the last case, we have just exited the loop.
3952 At this point, TYPE is the type of elements of an array,
3953 or for a function to return, or for a pointer to point to.
3954 After this sequence of ifs, TYPE is the type of the
3955 array or function or pointer, and DECLARATOR has had its
3956 outermost layer removed. */
3958 if (array_ptr_quals != TYPE_UNQUALIFIED
3959 || array_ptr_attrs != NULL_TREE
3960 || array_parm_static)
3962 /* Only the innermost declarator (making a parameter be of
3963 array type which is converted to pointer type)
3964 may have static or type qualifiers. */
3965 error ("static or type qualifiers in non-parameter array declarator");
3966 array_ptr_quals = TYPE_UNQUALIFIED;
3967 array_ptr_attrs = NULL_TREE;
3968 array_parm_static = 0;
3971 switch (declarator->kind)
3975 /* A declarator with embedded attributes. */
3976 tree attrs = declarator->u.attrs;
3977 const struct c_declarator *inner_decl;
3979 declarator = declarator->declarator;
3980 inner_decl = declarator;
3981 while (inner_decl->kind == cdk_attrs)
3982 inner_decl = inner_decl->declarator;
3983 if (inner_decl->kind == cdk_id)
3984 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3985 else if (inner_decl->kind == cdk_function)
3986 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3987 else if (inner_decl->kind == cdk_array)
3988 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3989 returned_attrs = decl_attributes (&type,
3990 chainon (returned_attrs, attrs),
3996 tree itype = NULL_TREE;
3997 tree size = declarator->u.array.dimen;
3998 /* The index is a signed object `sizetype' bits wide. */
3999 tree index_type = c_common_signed_type (sizetype);
4001 array_ptr_quals = declarator->u.array.quals;
4002 array_ptr_attrs = declarator->u.array.attrs;
4003 array_parm_static = declarator->u.array.static_p;
4005 declarator = declarator->declarator;
4007 /* Check for some types that there cannot be arrays of. */
4009 if (VOID_TYPE_P (type))
4011 error ("declaration of %qs as array of voids", name);
4012 type = error_mark_node;
4015 if (TREE_CODE (type) == FUNCTION_TYPE)
4017 error ("declaration of %qs as array of functions", name);
4018 type = error_mark_node;
4021 if (pedantic && !in_system_header && flexible_array_type_p (type))
4022 pedwarn ("invalid use of structure with flexible array member");
4024 if (size == error_mark_node)
4025 type = error_mark_node;
4027 if (type == error_mark_node)
4030 /* If size was specified, set ITYPE to a range-type for
4031 that size. Otherwise, ITYPE remains null. finish_decl
4032 may figure it out from an initial value. */
4036 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4038 STRIP_TYPE_NOPS (size);
4040 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4042 error ("size of array %qs has non-integer type", name);
4043 size = integer_one_node;
4046 if (pedantic && integer_zerop (size))
4047 pedwarn ("ISO C forbids zero-size array %qs", name);
4049 if (TREE_CODE (size) == INTEGER_CST)
4051 constant_expression_warning (size);
4052 if (tree_int_cst_sgn (size) < 0)
4054 error ("size of array %qs is negative", name);
4055 size = integer_one_node;
4060 /* Make sure the array size remains visibly
4061 nonconstant even if it is (eg) a const variable
4062 with known value. */
4065 if (!flag_isoc99 && pedantic)
4067 if (TREE_CONSTANT (size))
4068 pedwarn ("ISO C90 forbids array %qs whose size "
4069 "can%'t be evaluated",
4072 pedwarn ("ISO C90 forbids variable-size array %qs",
4077 if (integer_zerop (size))
4079 /* A zero-length array cannot be represented with
4080 an unsigned index type, which is what we'll
4081 get with build_index_type. Create an
4082 open-ended range instead. */
4083 itype = build_range_type (sizetype, size, NULL_TREE);
4087 /* Arrange for the SAVE_EXPR on the inside of the
4088 MINUS_EXPR, which allows the -1 to get folded
4089 with the +1 that happens when building TYPE_SIZE. */
4091 size = variable_size (size);
4093 /* Compute the maximum valid index, that is, size
4094 - 1. Do the calculation in index_type, so that
4095 if it is a variable the computations will be
4096 done in the proper mode. */
4097 itype = fold (build2 (MINUS_EXPR, index_type,
4098 convert (index_type, size),
4099 convert (index_type,
4102 /* If that overflowed, the array is too big. ???
4103 While a size of INT_MAX+1 technically shouldn't
4104 cause an overflow (because we subtract 1), the
4105 overflow is recorded during the conversion to
4106 index_type, before the subtraction. Handling
4107 this case seems like an unnecessary
4109 if (TREE_OVERFLOW (itype))
4111 error ("size of array %qs is too large", name);
4112 type = error_mark_node;
4116 itype = build_index_type (itype);
4119 else if (decl_context == FIELD)
4121 if (pedantic && !flag_isoc99 && !in_system_header)
4122 pedwarn ("ISO C90 does not support flexible array members");
4124 /* ISO C99 Flexible array members are effectively
4125 identical to GCC's zero-length array extension. */
4126 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4129 /* If pedantic, complain about arrays of incomplete types. */
4130 if (pedantic && !COMPLETE_TYPE_P (type))
4131 pedwarn ("array type has incomplete element type");
4133 /* Build the array type itself, then merge any constancy
4134 or volatility into the target type. We must do it in
4135 this order to ensure that the TYPE_MAIN_VARIANT field
4136 of the array type is set correctly. */
4137 type = build_array_type (type, itype);
4139 type = c_build_qualified_type (type, type_quals);
4142 C_TYPE_VARIABLE_SIZE (type) = 1;
4144 /* The GCC extension for zero-length arrays differs from
4145 ISO flexible array members in that sizeof yields
4147 if (size && integer_zerop (size))
4149 TYPE_SIZE (type) = bitsize_zero_node;
4150 TYPE_SIZE_UNIT (type) = size_zero_node;
4153 if (decl_context != PARM
4154 && (array_ptr_quals != TYPE_UNQUALIFIED
4155 || array_ptr_attrs != NULL_TREE
4156 || array_parm_static))
4158 error ("static or type qualifiers in non-parameter array declarator");
4159 array_ptr_quals = TYPE_UNQUALIFIED;
4160 array_ptr_attrs = NULL_TREE;
4161 array_parm_static = 0;
4167 /* Say it's a definition only for the declarator closest
4168 to the identifier, apart possibly from some
4170 bool really_funcdef = false;
4174 const struct c_declarator *t = declarator->declarator;
4175 while (t->kind == cdk_attrs)
4177 really_funcdef = (t->kind == cdk_id);
4180 /* Declaring a function type. Make sure we have a valid
4181 type for the function to return. */
4182 if (type == error_mark_node)
4187 /* Warn about some types functions can't return. */
4188 if (TREE_CODE (type) == FUNCTION_TYPE)
4190 error ("%qs declared as function returning a function", name);
4191 type = integer_type_node;
4193 if (TREE_CODE (type) == ARRAY_TYPE)
4195 error ("%qs declared as function returning an array", name);
4196 type = integer_type_node;
4199 /* Construct the function type and go to the next
4200 inner layer of declarator. */
4201 arg_info = declarator->u.arg_info;
4202 arg_types = grokparms (arg_info, really_funcdef);
4204 /* Type qualifiers before the return type of the function
4205 qualify the return type, not the function type. */
4208 /* Type qualifiers on a function return type are
4209 normally permitted by the standard but have no
4210 effect, so give a warning at -Wreturn-type.
4211 Qualifiers on a void return type are banned on
4212 function definitions in ISO C; GCC used to used
4213 them for noreturn functions. */
4214 if (VOID_TYPE_P (type) && really_funcdef)
4215 pedwarn ("function definition has qualified void return type");
4216 else if (warn_return_type)
4217 warning ("type qualifiers ignored on function return type");
4219 type = c_build_qualified_type (type, type_quals);
4221 type_quals = TYPE_UNQUALIFIED;
4223 type = build_function_type (type, arg_types);
4224 declarator = declarator->declarator;
4226 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4227 the formal parameter list of this FUNCTION_TYPE to point to
4228 the FUNCTION_TYPE node itself. */
4232 for (link = arg_info->tags;
4234 link = TREE_CHAIN (link))
4235 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4241 /* Merge any constancy or volatility into the target type
4244 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4246 pedwarn ("ISO C forbids qualified function types");
4248 type = c_build_qualified_type (type, type_quals);
4251 type = build_pointer_type (type);
4253 /* Process type qualifiers (such as const or volatile)
4254 that were given inside the `*'. */
4255 type_quals = declarator->u.pointer_quals;
4257 declarator = declarator->declarator;
4265 /* Now TYPE has the actual type. */
4267 /* Check the type and width of a bit-field. */
4269 check_bitfield_type_and_width (&type, width, orig_name);
4271 /* Did array size calculations overflow? */
4273 if (TREE_CODE (type) == ARRAY_TYPE
4274 && COMPLETE_TYPE_P (type)
4275 && TREE_OVERFLOW (TYPE_SIZE (type)))
4277 error ("size of array %qs is too large", name);
4278 /* If we proceed with the array type as it is, we'll eventually
4279 crash in tree_low_cst(). */
4280 type = error_mark_node;
4283 /* If this is declaring a typedef name, return a TYPE_DECL. */
4285 if (storage_class == csc_typedef)
4288 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4290 pedwarn ("ISO C forbids qualified function types");
4292 type = c_build_qualified_type (type, type_quals);
4293 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4294 if (declspecs->explicit_signed_p)
4295 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4296 decl_attributes (&decl, returned_attrs, 0);
4297 if (declspecs->inline_p)
4298 pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
4302 /* Detect the case of an array type of unspecified size
4303 which came, as such, direct from a typedef name.
4304 We must copy the type, so that each identifier gets
4305 a distinct type, so that each identifier's size can be
4306 controlled separately by its own initializer. */
4308 if (type != 0 && typedef_type != 0
4309 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4310 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4312 type = build_array_type (TREE_TYPE (type), 0);
4314 C_TYPE_VARIABLE_SIZE (type) = 1;
4317 /* If this is a type name (such as, in a cast or sizeof),
4318 compute the type and return it now. */
4320 if (decl_context == TYPENAME)
4322 /* Note that the grammar rejects storage classes in typenames
4324 gcc_assert (storage_class == csc_none && !threadp
4325 && !declspecs->inline_p);
4326 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4328 pedwarn ("ISO C forbids const or volatile function types");
4330 type = c_build_qualified_type (type, type_quals);
4331 decl_attributes (&type, returned_attrs, 0);
4335 /* Aside from typedefs and type names (handle above),
4336 `void' at top level (not within pointer)
4337 is allowed only in public variables.
4338 We don't complain about parms either, but that is because
4339 a better error message can be made later. */
4341 if (VOID_TYPE_P (type) && decl_context != PARM
4342 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4343 && (storage_class == csc_extern
4344 || (current_scope == file_scope
4345 && !(storage_class == csc_static
4346 || storage_class == csc_register)))))
4348 error ("variable or field %qs declared void", name);
4349 type = integer_type_node;
4352 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4353 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4358 if (decl_context == PARM)
4360 tree type_as_written;
4363 /* A parameter declared as an array of T is really a pointer to T.
4364 One declared as a function is really a pointer to a function. */
4366 if (TREE_CODE (type) == ARRAY_TYPE)
4368 /* Transfer const-ness of array into that of type pointed to. */
4369 type = TREE_TYPE (type);
4371 type = c_build_qualified_type (type, type_quals);
4372 type = build_pointer_type (type);
4373 type_quals = array_ptr_quals;
4375 /* We don't yet implement attributes in this context. */
4376 if (array_ptr_attrs != NULL_TREE)
4377 warning ("attributes in parameter array declarator ignored");
4381 else if (TREE_CODE (type) == FUNCTION_TYPE)
4383 if (pedantic && type_quals)
4384 pedwarn ("ISO C forbids qualified function types");
4386 type = c_build_qualified_type (type, type_quals);
4387 type = build_pointer_type (type);
4388 type_quals = TYPE_UNQUALIFIED;
4390 else if (type_quals)
4391 type = c_build_qualified_type (type, type_quals);
4393 type_as_written = type;
4395 decl = build_decl (PARM_DECL, declarator->u.id, type);
4397 C_DECL_VARIABLE_SIZE (decl) = 1;
4399 /* Compute the type actually passed in the parmlist,
4400 for the case where there is no prototype.
4401 (For example, shorts and chars are passed as ints.)
4402 When there is a prototype, this is overridden later. */
4404 if (type == error_mark_node)
4405 promoted_type = type;
4407 promoted_type = c_type_promotes_to (type);
4409 DECL_ARG_TYPE (decl) = promoted_type;
4410 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4411 if (declspecs->inline_p)
4412 pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
4414 else if (decl_context == FIELD)
4416 /* Note that the grammar rejects storage classes in typenames
4418 gcc_assert (storage_class == csc_none && !threadp
4419 && !declspecs->inline_p);
4421 /* Structure field. It may not be a function. */
4423 if (TREE_CODE (type) == FUNCTION_TYPE)
4425 error ("field %qs declared as a function", name);
4426 type = build_pointer_type (type);
4428 else if (TREE_CODE (type) != ERROR_MARK
4429 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4431 error ("field %qs has incomplete type", name);
4432 type = error_mark_node;
4434 /* Move type qualifiers down to element of an array. */
4435 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4436 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4438 TYPE_DOMAIN (type));
4439 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4440 DECL_NONADDRESSABLE_P (decl) = bitfield;
4443 C_DECL_VARIABLE_SIZE (decl) = 1;
4445 else if (TREE_CODE (type) == FUNCTION_TYPE)
4447 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4448 decl = build_decl_attribute_variant (decl, decl_attr);
4450 if (storage_class == csc_register || threadp)
4452 error ("invalid storage class for function %qs", name);
4453 if (DECL_INITIAL (decl) != NULL_TREE)
4454 DECL_INITIAL (decl) = error_mark_node;
4456 else if (current_scope != file_scope)
4458 /* Function declaration not at file scope. Storage
4459 classes other than `extern' are not allowed, C99
4460 6.7.1p5, and `extern' makes no difference. However,
4461 GCC allows 'auto', perhaps with 'inline', to support
4462 nested functions. */
4463 if (storage_class == csc_auto)
4466 pedwarn ("invalid storage class for function %qs", name);
4468 if (storage_class == csc_static)
4470 error ("invalid storage class for function %qs", name);
4471 if (DECL_INITIAL (decl) != NULL_TREE)
4472 DECL_INITIAL (decl) = error_mark_node;
4476 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4478 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4479 pedwarn ("ISO C forbids qualified function types");
4481 /* GNU C interprets a volatile-qualified function type to indicate
4482 that the function does not return. */
4483 if ((type_quals & TYPE_QUAL_VOLATILE)
4484 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4485 warning ("%<noreturn%> function returns non-void value");
4487 /* Every function declaration is an external reference
4488 (DECL_EXTERNAL) except for those which are not at file
4489 scope and are explicitly declared "auto". This is
4490 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4491 GCC to signify a forward declaration of a nested function. */
4492 if (storage_class == csc_auto && current_scope != file_scope)
4493 DECL_EXTERNAL (decl) = 0;
4495 DECL_EXTERNAL (decl) = 1;
4497 /* Record absence of global scope for `static' or `auto'. */
4499 = !(storage_class == csc_static || storage_class == csc_auto);
4501 /* For a function definition, record the argument information
4502 block where store_parm_decls will look for it. */
4504 current_function_arg_info = arg_info;
4506 if (declspecs->default_int_p)
4507 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4509 /* Record presence of `inline', if it is reasonable. */
4510 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4512 if (declspecs->inline_p)
4513 pedwarn ("cannot inline function %<main%>");
4515 else if (declspecs->inline_p)
4517 /* Record that the function is declared `inline'. */
4518 DECL_DECLARED_INLINE_P (decl) = 1;
4520 /* Do not mark bare declarations as DECL_INLINE. Doing so
4521 in the presence of multiple declarations can result in
4522 the abstract origin pointing between the declarations,
4523 which will confuse dwarf2out. */
4526 DECL_INLINE (decl) = 1;
4527 if (storage_class == csc_extern)
4528 current_extern_inline = 1;
4531 /* If -finline-functions, assume it can be inlined. This does
4532 two things: let the function be deferred until it is actually
4533 needed, and let dwarf2 know that the function is inlinable. */
4534 else if (flag_inline_trees == 2 && initialized)
4535 DECL_INLINE (decl) = 1;
4539 /* It's a variable. */
4540 /* An uninitialized decl with `extern' is a reference. */
4541 int extern_ref = !initialized && storage_class == csc_extern;
4543 /* Move type qualifiers down to element of an array. */
4544 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4546 int saved_align = TYPE_ALIGN(type);
4547 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4549 TYPE_DOMAIN (type));
4550 TYPE_ALIGN (type) = saved_align;
4552 else if (type_quals)
4553 type = c_build_qualified_type (type, type_quals);
4555 /* C99 6.2.2p7: It is invalid (compile-time undefined
4556 behavior) to create an 'extern' declaration for a
4557 variable if there is a global declaration that is
4558 'static' and the global declaration is not visible.
4559 (If the static declaration _is_ currently visible,
4560 the 'extern' declaration is taken to refer to that decl.) */
4561 if (extern_ref && current_scope != file_scope)
4563 tree global_decl = identifier_global_value (declarator->u.id);
4564 tree visible_decl = lookup_name (declarator->u.id);
4567 && global_decl != visible_decl
4568 && TREE_CODE (global_decl) == VAR_DECL
4569 && !TREE_PUBLIC (global_decl))
4570 error ("variable previously declared %<static%> redeclared "
4574 decl = build_decl (VAR_DECL, declarator->u.id, type);
4576 C_DECL_VARIABLE_SIZE (decl) = 1;
4578 if (declspecs->inline_p)
4579 pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
4581 /* At file scope, an initialized extern declaration may follow
4582 a static declaration. In that case, DECL_EXTERNAL will be
4583 reset later in start_decl. */
4584 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4586 /* At file scope, the presence of a `static' or `register' storage
4587 class specifier, or the absence of all storage class specifiers
4588 makes this declaration a definition (perhaps tentative). Also,
4589 the absence of both `static' and `register' makes it public. */
4590 if (current_scope == file_scope)
4592 TREE_PUBLIC (decl) = !(storage_class == csc_static
4593 || storage_class == csc_register);
4594 TREE_STATIC (decl) = !extern_ref;
4596 /* Not at file scope, only `static' makes a static definition. */
4599 TREE_STATIC (decl) = (storage_class == csc_static);
4600 TREE_PUBLIC (decl) = extern_ref;
4605 if (targetm.have_tls)
4606 DECL_THREAD_LOCAL (decl) = 1;
4608 /* A mere warning is sure to result in improper semantics
4609 at runtime. Don't bother to allow this to compile. */
4610 error ("thread-local storage not supported for this target");
4614 /* Record `register' declaration for warnings on &
4615 and in case doing stupid register allocation. */
4617 if (storage_class == csc_register)
4619 C_DECL_REGISTER (decl) = 1;
4620 DECL_REGISTER (decl) = 1;
4623 /* Record constancy and volatility. */
4624 c_apply_type_quals_to_decl (type_quals, decl);
4626 /* If a type has volatile components, it should be stored in memory.
4627 Otherwise, the fact that those components are volatile
4628 will be ignored, and would even crash the compiler. */
4629 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4631 /* It is not an error for a structure with volatile fields to
4632 be declared register, but reset DECL_REGISTER since it
4633 cannot actually go in a register. */
4634 int was_reg = C_DECL_REGISTER (decl);
4635 C_DECL_REGISTER (decl) = 0;
4636 DECL_REGISTER (decl) = 0;
4637 c_mark_addressable (decl);
4638 C_DECL_REGISTER (decl) = was_reg;
4641 /* This is the earliest point at which we might know the assembler
4642 name of a variable. Thus, if it's known before this, die horribly. */
4643 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4645 decl_attributes (&decl, returned_attrs, 0);
4651 /* Decode the parameter-list info for a function type or function definition.
4652 The argument is the value returned by `get_parm_info' (or made in parse.y
4653 if there is an identifier list instead of a parameter decl list).
4654 These two functions are separate because when a function returns
4655 or receives functions then each is called multiple times but the order
4656 of calls is different. The last call to `grokparms' is always the one
4657 that contains the formal parameter names of a function definition.
4659 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4661 FUNCDEF_FLAG is true for a function definition, false for
4662 a mere declaration. A nonempty identifier-list gets an error message
4663 when FUNCDEF_FLAG is false. */
4666 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4668 tree arg_types = arg_info->types;
4670 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4671 && !in_system_header)
4672 warning ("function declaration isn%'t a prototype");
4674 if (arg_types == error_mark_node)
4675 return 0; /* don't set TYPE_ARG_TYPES in this case */
4677 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4680 pedwarn ("parameter names (without types) in function declaration");
4682 arg_info->parms = arg_info->types;
4683 arg_info->types = 0;
4688 tree parm, type, typelt;
4689 unsigned int parmno;
4691 /* If there is a parameter of incomplete type in a definition,
4692 this is an error. In a declaration this is valid, and a
4693 struct or union type may be completed later, before any calls
4694 or definition of the function. In the case where the tag was
4695 first declared within the parameter list, a warning has
4696 already been given. If a parameter has void type, then
4697 however the function cannot be defined or called, so
4700 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4702 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4704 type = TREE_VALUE (typelt);
4705 if (type == error_mark_node)
4708 if (!COMPLETE_TYPE_P (type))
4712 if (DECL_NAME (parm))
4713 error ("%Jparameter %u (%qD) has incomplete type",
4714 parm, parmno, parm);
4716 error ("%Jparameter %u has incomplete type",
4719 TREE_VALUE (typelt) = error_mark_node;
4720 TREE_TYPE (parm) = error_mark_node;
4722 else if (VOID_TYPE_P (type))
4724 if (DECL_NAME (parm))
4725 warning ("%Jparameter %u (%qD) has void type",
4726 parm, parmno, parm);
4728 warning ("%Jparameter %u has void type",
4737 /* Take apart the current scope and return a c_arg_info structure with
4738 info on a parameter list just parsed.
4740 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4742 ELLIPSIS being true means the argument list ended in '...' so don't
4743 append a sentinel (void_list_node) to the end of the type-list. */
4746 get_parm_info (bool ellipsis)
4748 struct c_binding *b = current_scope->bindings;
4749 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4756 static bool explained_incomplete_types = false;
4757 bool gave_void_only_once_err = false;
4759 arg_info->parms = 0;
4761 arg_info->types = 0;
4762 arg_info->others = 0;
4764 /* The bindings in this scope must not get put into a block.
4765 We will take care of deleting the binding nodes. */
4766 current_scope->bindings = 0;
4768 /* This function is only called if there was *something* on the
4772 /* A parameter list consisting solely of 'void' indicates that the
4773 function takes no arguments. But if the 'void' is qualified
4774 (by 'const' or 'volatile'), or has a storage class specifier
4775 ('register'), then the behavior is undefined; issue an error.
4776 Typedefs for 'void' are OK (see DR#157). */
4777 if (b->prev == 0 /* one binding */
4778 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4779 && !DECL_NAME (b->decl) /* anonymous */
4780 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4782 if (TREE_THIS_VOLATILE (b->decl)
4783 || TREE_READONLY (b->decl)
4784 || C_DECL_REGISTER (b->decl))
4785 error ("%<void%> as only parameter may not be qualified");
4787 /* There cannot be an ellipsis. */
4789 error ("%<void%> must be the only parameter");
4791 arg_info->types = void_list_node;
4796 types = void_list_node;
4798 /* Break up the bindings list into parms, tags, types, and others;
4799 apply sanity checks; purge the name-to-decl bindings. */
4802 tree decl = b->decl;
4803 tree type = TREE_TYPE (decl);
4804 const char *keyword;
4806 switch (TREE_CODE (decl))
4811 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4812 I_SYMBOL_BINDING (b->id) = b->shadowed;
4815 /* Check for forward decls that never got their actual decl. */
4816 if (TREE_ASM_WRITTEN (decl))
4817 error ("%Jparameter %qD has just a forward declaration",
4819 /* Check for (..., void, ...) and issue an error. */
4820 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4822 if (!gave_void_only_once_err)
4824 error ("%<void%> must be the only parameter");
4825 gave_void_only_once_err = true;
4830 /* Valid parameter, add it to the list. */
4831 TREE_CHAIN (decl) = parms;
4834 /* Since there is a prototype, args are passed in their
4835 declared types. The back end may override this later. */
4836 DECL_ARG_TYPE (decl) = type;
4837 types = tree_cons (0, type, types);
4841 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4842 case UNION_TYPE: keyword = "union"; goto tag;
4843 case RECORD_TYPE: keyword = "struct"; goto tag;
4845 /* Types may not have tag-names, in which case the type
4846 appears in the bindings list with b->id NULL. */
4849 gcc_assert (I_TAG_BINDING (b->id) == b);
4850 I_TAG_BINDING (b->id) = b->shadowed;
4853 /* Warn about any struct, union or enum tags defined in a
4854 parameter list. The scope of such types is limited to
4855 the parameter list, which is rarely if ever desirable
4856 (it's impossible to call such a function with type-
4857 correct arguments). An anonymous union parm type is
4858 meaningful as a GNU extension, so don't warn for that. */
4859 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4862 /* The %s will be one of 'struct', 'union', or 'enum'. */
4863 warning ("%<%s %E%> declared inside parameter list",
4866 /* The %s will be one of 'struct', 'union', or 'enum'. */
4867 warning ("anonymous %s declared inside parameter list",
4870 if (!explained_incomplete_types)
4872 warning ("its scope is only this definition or declaration,"
4873 " which is probably not what you want");
4874 explained_incomplete_types = true;
4878 tags = tree_cons (b->id, decl, tags);
4884 /* CONST_DECLs appear here when we have an embedded enum,
4885 and TYPE_DECLs appear here when we have an embedded struct
4886 or union. No warnings for this - we already warned about the
4887 type itself. FUNCTION_DECLs appear when there is an implicit
4888 function declaration in the parameter list. */
4890 TREE_CHAIN (decl) = others;
4895 /* error_mark_node appears here when we have an undeclared
4896 variable. Just throw it away. */
4899 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4900 I_SYMBOL_BINDING (b->id) = b->shadowed;
4904 /* Other things that might be encountered. */
4911 b = free_binding_and_advance (b);
4914 arg_info->parms = parms;
4915 arg_info->tags = tags;
4916 arg_info->types = types;
4917 arg_info->others = others;
4921 /* Get the struct, enum or union (CODE says which) with tag NAME.
4922 Define the tag as a forward-reference if it is not defined.
4923 Return a c_typespec structure for the type specifier. */
4926 parser_xref_tag (enum tree_code code, tree name)
4928 struct c_typespec ret;
4929 /* If a cross reference is requested, look up the type
4930 already defined for this tag and return it. */
4932 tree ref = lookup_tag (code, name, 0);
4933 /* If this is the right type of tag, return what we found.
4934 (This reference will be shadowed by shadow_tag later if appropriate.)
4935 If this is the wrong type of tag, do not return it. If it was the
4936 wrong type in the same scope, we will have had an error
4937 message already; if in a different scope and declaring
4938 a name, pending_xref_error will give an error message; but if in a
4939 different scope and not declaring a name, this tag should
4940 shadow the previous declaration of a different type of tag, and
4941 this would not work properly if we return the reference found.
4942 (For example, with "struct foo" in an outer scope, "union foo;"
4943 must shadow that tag with a new one of union type.) */
4944 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
4945 if (ref && TREE_CODE (ref) == code)
4951 /* If no such tag is yet defined, create a forward-reference node
4952 and record it as the "definition".
4953 When a real declaration of this type is found,
4954 the forward-reference will be altered into a real type. */
4956 ref = make_node (code);
4957 if (code == ENUMERAL_TYPE)
4959 /* Give the type a default layout like unsigned int
4960 to avoid crashing if it does not get defined. */
4961 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4962 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4963 TYPE_USER_ALIGN (ref) = 0;
4964 TYPE_UNSIGNED (ref) = 1;
4965 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4966 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4967 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4970 pushtag (name, ref);
4976 /* Get the struct, enum or union (CODE says which) with tag NAME.
4977 Define the tag as a forward-reference if it is not defined.
4978 Return a tree for the type. */
4981 xref_tag (enum tree_code code, tree name)
4983 return parser_xref_tag (code, name).spec;
4986 /* Make sure that the tag NAME is defined *in the current scope*
4987 at least as a forward reference.
4988 CODE says which kind of tag NAME ought to be. */
4991 start_struct (enum tree_code code, tree name)
4993 /* If there is already a tag defined at this scope
4994 (as a forward reference), just return it. */
4999 ref = lookup_tag (code, name, 1);
5000 if (ref && TREE_CODE (ref) == code)
5002 if (TYPE_SIZE (ref))
5004 if (code == UNION_TYPE)
5005 error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name));
5007 error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name));
5009 else if (C_TYPE_BEING_DEFINED (ref))
5011 if (code == UNION_TYPE)
5012 error ("nested redefinition of %<union %s%>",
5013 IDENTIFIER_POINTER (name));
5015 error ("nested redefinition of %<struct %s%>",
5016 IDENTIFIER_POINTER (name));
5021 /* Otherwise create a forward-reference just so the tag is in scope. */
5023 ref = make_node (code);
5024 pushtag (name, ref);
5027 C_TYPE_BEING_DEFINED (ref) = 1;
5028 TYPE_PACKED (ref) = flag_pack_struct;
5032 /* Process the specs, declarator and width (NULL if omitted)
5033 of a structure component, returning a FIELD_DECL node.
5034 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5036 This is done during the parsing of the struct declaration.
5037 The FIELD_DECL nodes are chained together and the lot of them
5038 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5041 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5046 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5047 && width == NULL_TREE)
5049 /* This is an unnamed decl.
5051 If we have something of the form "union { list } ;" then this
5052 is the anonymous union extension. Similarly for struct.
5054 If this is something of the form "struct foo;", then
5055 If MS extensions are enabled, this is handled as an
5057 Otherwise this is a forward declaration of a structure tag.
5059 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5060 If MS extensions are enabled and foo names a structure, then
5061 again this is an anonymous struct.
5062 Otherwise this is an error.
5064 Oh what a horrid tangled web we weave. I wonder if MS consciously
5065 took this from Plan 9 or if it was an accident of implementation
5066 that took root before someone noticed the bug... */
5068 tree type = declspecs->type;
5069 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5070 || TREE_CODE (type) == UNION_TYPE);
5074 && (flag_ms_extensions || !declspecs->typedef_p))
5076 if (flag_ms_extensions)
5080 else if (TYPE_NAME (type) == NULL)
5087 pedwarn ("declaration does not declare anything");
5091 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5094 value = grokdeclarator (declarator, declspecs, FIELD, false,
5095 width ? &width : NULL);
5097 finish_decl (value, NULL_TREE, NULL_TREE);
5098 DECL_INITIAL (value) = width;
5103 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5104 the list such that this does not present a problem later. */
5107 detect_field_duplicates (tree fieldlist)
5112 /* First, see if there are more than "a few" fields.
5113 This is trivially true if there are zero or one fields. */
5116 x = TREE_CHAIN (fieldlist);
5122 } while (timeout > 0 && x);
5124 /* If there were "few" fields, avoid the overhead of allocating
5125 a hash table. Instead just do the nested traversal thing. */
5128 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5131 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5132 if (DECL_NAME (y) == DECL_NAME (x))
5134 error ("%Jduplicate member %qD", x, x);
5135 DECL_NAME (x) = NULL_TREE;
5141 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5144 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5145 if ((y = DECL_NAME (x)) != 0)
5147 slot = htab_find_slot (htab, y, INSERT);
5150 error ("%Jduplicate member %qD", x, x);
5151 DECL_NAME (x) = NULL_TREE;
5160 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5161 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5162 ATTRIBUTES are attributes to be applied to the structure. */
5165 finish_struct (tree t, tree fieldlist, tree attributes)
5168 bool toplevel = file_scope == current_scope;
5169 int saw_named_field;
5171 /* If this type was previously laid out as a forward reference,
5172 make sure we lay it out again. */
5176 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5180 for (x = fieldlist; x; x = TREE_CHAIN (x))
5181 if (DECL_NAME (x) != 0)
5186 if (TREE_CODE (t) == UNION_TYPE)
5189 pedwarn ("union has no named members");
5191 pedwarn ("union has no members");
5196 pedwarn ("struct has no named members");
5198 pedwarn ("struct has no members");
5203 /* Install struct as DECL_CONTEXT of each field decl.
5204 Also process specified field sizes, found in the DECL_INITIAL,
5205 storing 0 there after the type has been changed to precision equal
5206 to its width, rather than the precision of the specified standard
5207 type. (Correct layout requires the original type to have been preserved
5210 saw_named_field = 0;
5211 for (x = fieldlist; x; x = TREE_CHAIN (x))
5213 DECL_CONTEXT (x) = t;
5214 DECL_PACKED (x) |= TYPE_PACKED (t);
5216 /* If any field is const, the structure type is pseudo-const. */
5217 if (TREE_READONLY (x))
5218 C_TYPE_FIELDS_READONLY (t) = 1;
5221 /* A field that is pseudo-const makes the structure likewise. */
5222 tree t1 = TREE_TYPE (x);
5223 while (TREE_CODE (t1) == ARRAY_TYPE)
5224 t1 = TREE_TYPE (t1);
5225 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5226 && C_TYPE_FIELDS_READONLY (t1))
5227 C_TYPE_FIELDS_READONLY (t) = 1;
5230 /* Any field that is volatile means variables of this type must be
5231 treated in some ways as volatile. */
5232 if (TREE_THIS_VOLATILE (x))
5233 C_TYPE_FIELDS_VOLATILE (t) = 1;
5235 /* Any field of nominal variable size implies structure is too. */
5236 if (C_DECL_VARIABLE_SIZE (x))
5237 C_TYPE_VARIABLE_SIZE (t) = 1;
5239 if (DECL_INITIAL (x))
5241 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5242 DECL_SIZE (x) = bitsize_int (width);
5243 DECL_BIT_FIELD (x) = 1;
5244 SET_DECL_C_BIT_FIELD (x);
5247 /* Detect flexible array member in an invalid context. */
5248 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5249 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5250 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5251 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5253 if (TREE_CODE (t) == UNION_TYPE)
5255 error ("%Jflexible array member in union", x);
5256 TREE_TYPE (x) = error_mark_node;
5258 else if (TREE_CHAIN (x) != NULL_TREE)
5260 error ("%Jflexible array member not at end of struct", x);
5261 TREE_TYPE (x) = error_mark_node;
5263 else if (!saw_named_field)
5265 error ("%Jflexible array member in otherwise empty struct", x);
5266 TREE_TYPE (x) = error_mark_node;
5270 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5271 && flexible_array_type_p (TREE_TYPE (x)))
5272 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5275 saw_named_field = 1;
5278 detect_field_duplicates (fieldlist);
5280 /* Now we have the nearly final fieldlist. Record it,
5281 then lay out the structure or union (including the fields). */
5283 TYPE_FIELDS (t) = fieldlist;
5287 /* Give bit-fields their proper types. */
5289 tree *fieldlistp = &fieldlist;
5291 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5292 && TREE_TYPE (*fieldlistp) != error_mark_node)
5294 unsigned HOST_WIDE_INT width
5295 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5296 tree type = TREE_TYPE (*fieldlistp);
5297 if (width != TYPE_PRECISION (type))
5298 TREE_TYPE (*fieldlistp)
5299 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5300 DECL_INITIAL (*fieldlistp) = 0;
5303 fieldlistp = &TREE_CHAIN (*fieldlistp);
5306 /* Now we have the truly final field list.
5307 Store it in this type and in the variants. */
5309 TYPE_FIELDS (t) = fieldlist;
5311 /* If there are lots of fields, sort so we can look through them fast.
5312 We arbitrarily consider 16 or more elts to be "a lot". */
5317 for (x = fieldlist; x; x = TREE_CHAIN (x))
5319 if (len > 15 || DECL_NAME (x) == NULL)
5327 struct lang_type *space;
5328 struct sorted_fields_type *space2;
5330 len += list_length (x);
5332 /* Use the same allocation policy here that make_node uses, to
5333 ensure that this lives as long as the rest of the struct decl.
5334 All decls in an inline function need to be saved. */
5336 space = GGC_CNEW (struct lang_type);
5337 space2 = GGC_NEWVAR (struct sorted_fields_type,
5338 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5342 field_array = &space2->elts[0];
5343 for (x = fieldlist; x; x = TREE_CHAIN (x))
5345 field_array[len++] = x;
5347 /* If there is anonymous struct or union, break out of the loop. */
5348 if (DECL_NAME (x) == NULL)
5351 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5354 TYPE_LANG_SPECIFIC (t) = space;
5355 TYPE_LANG_SPECIFIC (t)->s->len = len;
5356 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5357 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5362 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5364 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5365 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5366 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5367 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5370 /* If this was supposed to be a transparent union, but we can't
5371 make it one, warn and turn off the flag. */
5372 if (TREE_CODE (t) == UNION_TYPE
5373 && TYPE_TRANSPARENT_UNION (t)
5374 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5376 TYPE_TRANSPARENT_UNION (t) = 0;
5377 warning ("union cannot be made transparent");
5380 /* If this structure or union completes the type of any previous
5381 variable declaration, lay it out and output its rtl. */
5382 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5386 tree decl = TREE_VALUE (x);
5387 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5388 layout_array_type (TREE_TYPE (decl));
5389 if (TREE_CODE (decl) != TYPE_DECL)
5391 layout_decl (decl, 0);
5392 if (c_dialect_objc ())
5393 objc_check_decl (decl);
5394 rest_of_decl_compilation (decl, toplevel, 0);
5399 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5401 /* Finish debugging output for this type. */
5402 rest_of_type_compilation (t, toplevel);
5404 /* If we're inside a function proper, i.e. not file-scope and not still
5405 parsing parameters, then arrange for the size of a variable sized type
5407 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5408 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5413 /* Lay out the type T, and its element type, and so on. */
5416 layout_array_type (tree t)
5418 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5419 layout_array_type (TREE_TYPE (t));
5423 /* Begin compiling the definition of an enumeration type.
5424 NAME is its name (or null if anonymous).
5425 Returns the type object, as yet incomplete.
5426 Also records info about it so that build_enumerator
5427 may be used to declare the individual values as they are read. */
5430 start_enum (tree name)
5434 /* If this is the real definition for a previous forward reference,
5435 fill in the contents in the same object that used to be the
5436 forward reference. */
5439 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5441 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5443 enumtype = make_node (ENUMERAL_TYPE);
5444 pushtag (name, enumtype);
5447 if (C_TYPE_BEING_DEFINED (enumtype))
5448 error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name));
5450 C_TYPE_BEING_DEFINED (enumtype) = 1;
5452 if (TYPE_VALUES (enumtype) != 0)
5454 /* This enum is a named one that has been declared already. */
5455 error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name));
5457 /* Completely replace its old definition.
5458 The old enumerators remain defined, however. */
5459 TYPE_VALUES (enumtype) = 0;
5462 enum_next_value = integer_zero_node;
5465 if (flag_short_enums)
5466 TYPE_PACKED (enumtype) = 1;
5471 /* After processing and defining all the values of an enumeration type,
5472 install their decls in the enumeration type and finish it off.
5473 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5474 and ATTRIBUTES are the specified attributes.
5475 Returns ENUMTYPE. */
5478 finish_enum (tree enumtype, tree values, tree attributes)
5481 tree minnode = 0, maxnode = 0;
5482 int precision, unsign;
5483 bool toplevel = (file_scope == current_scope);
5484 struct lang_type *lt;
5486 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5488 /* Calculate the maximum value of any enumerator in this type. */
5490 if (values == error_mark_node)
5491 minnode = maxnode = integer_zero_node;
5494 minnode = maxnode = TREE_VALUE (values);
5495 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5497 tree value = TREE_VALUE (pair);
5498 if (tree_int_cst_lt (maxnode, value))
5500 if (tree_int_cst_lt (value, minnode))
5505 /* Construct the final type of this enumeration. It is the same
5506 as one of the integral types - the narrowest one that fits, except
5507 that normally we only go as narrow as int - and signed iff any of
5508 the values are negative. */
5509 unsign = (tree_int_cst_sgn (minnode) >= 0);
5510 precision = MAX (min_precision (minnode, unsign),
5511 min_precision (maxnode, unsign));
5513 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5515 tem = c_common_type_for_size (precision, unsign);
5518 warning ("enumeration values exceed range of largest integer");
5519 tem = long_long_integer_type_node;
5523 tem = unsign ? unsigned_type_node : integer_type_node;
5525 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5526 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5527 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5528 TYPE_SIZE (enumtype) = 0;
5530 /* If the precision of the type was specific with an attribute and it
5531 was too small, give an error. Otherwise, use it. */
5532 if (TYPE_PRECISION (enumtype))
5534 if (precision > TYPE_PRECISION (enumtype))
5535 error ("specified mode too small for enumeral values");
5538 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5540 layout_type (enumtype);
5542 if (values != error_mark_node)
5544 /* Change the type of the enumerators to be the enum type. We
5545 need to do this irrespective of the size of the enum, for
5546 proper type checking. Replace the DECL_INITIALs of the
5547 enumerators, and the value slots of the list, with copies
5548 that have the enum type; they cannot be modified in place
5549 because they may be shared (e.g. integer_zero_node) Finally,
5550 change the purpose slots to point to the names of the decls. */
5551 for (pair = values; pair; pair = TREE_CHAIN (pair))
5553 tree enu = TREE_PURPOSE (pair);
5554 tree ini = DECL_INITIAL (enu);
5556 TREE_TYPE (enu) = enumtype;
5558 /* The ISO C Standard mandates enumerators to have type int,
5559 even though the underlying type of an enum type is
5560 unspecified. Here we convert any enumerators that fit in
5561 an int to type int, to avoid promotions to unsigned types
5562 when comparing integers with enumerators that fit in the
5563 int range. When -pedantic is given, build_enumerator()
5564 would have already taken care of those that don't fit. */
5565 if (int_fits_type_p (ini, integer_type_node))
5566 tem = integer_type_node;
5569 ini = convert (tem, ini);
5571 DECL_INITIAL (enu) = ini;
5572 TREE_PURPOSE (pair) = DECL_NAME (enu);
5573 TREE_VALUE (pair) = ini;
5576 TYPE_VALUES (enumtype) = values;
5579 /* Record the min/max values so that we can warn about bit-field
5580 enumerations that are too small for the values. */
5581 lt = GGC_CNEW (struct lang_type);
5582 lt->enum_min = minnode;
5583 lt->enum_max = maxnode;
5584 TYPE_LANG_SPECIFIC (enumtype) = lt;
5586 /* Fix up all variant types of this enum type. */
5587 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5589 if (tem == enumtype)
5591 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5592 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5593 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5594 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5595 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5596 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5597 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5598 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5599 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5600 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5601 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5604 /* Finish debugging output for this type. */
5605 rest_of_type_compilation (enumtype, toplevel);
5610 /* Build and install a CONST_DECL for one value of the
5611 current enumeration type (one that was begun with start_enum).
5612 Return a tree-list containing the CONST_DECL and its value.
5613 Assignment of sequential values by default is handled here. */
5616 build_enumerator (tree name, tree value)
5620 /* Validate and default VALUE. */
5622 /* Remove no-op casts from the value. */
5624 STRIP_TYPE_NOPS (value);
5628 /* Don't issue more errors for error_mark_node (i.e. an
5629 undeclared identifier) - just ignore the value expression. */
5630 if (value == error_mark_node)
5632 else if (TREE_CODE (value) != INTEGER_CST)
5634 error ("enumerator value for %qE is not an integer constant", name);
5639 value = default_conversion (value);
5640 constant_expression_warning (value);
5644 /* Default based on previous value. */
5645 /* It should no longer be possible to have NON_LVALUE_EXPR
5649 value = enum_next_value;
5651 error ("overflow in enumeration values");
5654 if (pedantic && !int_fits_type_p (value, integer_type_node))
5656 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5657 /* XXX This causes -pedantic to change the meaning of the program.
5658 Remove? -zw 2004-03-15 */
5659 value = convert (integer_type_node, value);
5662 /* Set basis for default for next value. */
5663 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5664 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5666 /* Now create a declaration for the enum value name. */
5668 type = TREE_TYPE (value);
5669 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5670 TYPE_PRECISION (integer_type_node)),
5671 (TYPE_PRECISION (type)
5672 >= TYPE_PRECISION (integer_type_node)
5673 && TYPE_UNSIGNED (type)));
5675 decl = build_decl (CONST_DECL, name, type);
5676 DECL_INITIAL (decl) = convert (type, value);
5679 return tree_cons (decl, value, NULL_TREE);
5683 /* Create the FUNCTION_DECL for a function definition.
5684 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5685 the declaration; they describe the function's name and the type it returns,
5686 but twisted together in a fashion that parallels the syntax of C.
5688 This function creates a binding context for the function body
5689 as well as setting up the FUNCTION_DECL in current_function_decl.
5691 Returns 1 on success. If the DECLARATOR is not suitable for a function
5692 (it defines a datum instead), we return 0, which tells
5693 yyparse to report a parse error. */
5696 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5699 tree decl1, old_decl;
5700 tree restype, resdecl;
5702 current_function_returns_value = 0; /* Assume, until we see it does. */
5703 current_function_returns_null = 0;
5704 current_function_returns_abnormally = 0;
5705 warn_about_return_type = 0;
5706 current_extern_inline = 0;
5707 c_switch_stack = NULL;
5709 /* Indicate no valid break/continue context by setting these variables
5710 to some non-null, non-label value. We'll notice and emit the proper
5711 error message in c_finish_bc_stmt. */
5712 c_break_label = c_cont_label = size_zero_node;
5714 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5716 /* If the declarator is not suitable for a function definition,
5717 cause a syntax error. */
5721 decl_attributes (&decl1, attributes, 0);
5723 if (DECL_DECLARED_INLINE_P (decl1)
5724 && DECL_UNINLINABLE (decl1)
5725 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5726 warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
5728 announce_function (decl1);
5730 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5732 error ("return type is an incomplete type");
5733 /* Make it return void instead. */
5735 = build_function_type (void_type_node,
5736 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5739 if (warn_about_return_type)
5740 pedwarn_c99 ("return type defaults to %<int%>");
5742 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5743 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5744 DECL_INITIAL (decl1) = error_mark_node;
5746 /* If this definition isn't a prototype and we had a prototype declaration
5747 before, copy the arg type info from that prototype. */
5748 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5749 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5750 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5751 TREE_TYPE (TREE_TYPE (old_decl)))
5752 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5754 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5756 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5759 /* Optionally warn of old-fashioned def with no previous prototype. */
5760 if (warn_strict_prototypes
5761 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5762 && C_DECL_ISNT_PROTOTYPE (old_decl))
5763 warning ("function declaration isn%'t a prototype");
5764 /* Optionally warn of any global def with no previous prototype. */
5765 else if (warn_missing_prototypes
5766 && TREE_PUBLIC (decl1)
5767 && !MAIN_NAME_P (DECL_NAME (decl1))
5768 && C_DECL_ISNT_PROTOTYPE (old_decl))
5769 warning ("%Jno previous prototype for %qD", decl1, decl1);
5770 /* Optionally warn of any def with no previous prototype
5771 if the function has already been used. */
5772 else if (warn_missing_prototypes
5773 && old_decl != 0 && TREE_USED (old_decl)
5774 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5775 warning ("%J%qD was used with no prototype before its definition",
5777 /* Optionally warn of any global def with no previous declaration. */
5778 else if (warn_missing_declarations
5779 && TREE_PUBLIC (decl1)
5781 && !MAIN_NAME_P (DECL_NAME (decl1)))
5782 warning ("%Jno previous declaration for %qD", decl1, decl1);
5783 /* Optionally warn of any def with no previous declaration
5784 if the function has already been used. */
5785 else if (warn_missing_declarations
5786 && old_decl != 0 && TREE_USED (old_decl)
5787 && C_DECL_IMPLICIT (old_decl))
5788 warning ("%J%qD was used with no declaration before its definition",
5791 /* This is a definition, not a reference.
5792 So normally clear DECL_EXTERNAL.
5793 However, `extern inline' acts like a declaration
5794 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5795 DECL_EXTERNAL (decl1) = current_extern_inline;
5797 /* This function exists in static storage.
5798 (This does not mean `static' in the C sense!) */
5799 TREE_STATIC (decl1) = 1;
5801 /* A nested function is not global. */
5802 if (current_function_decl != 0)
5803 TREE_PUBLIC (decl1) = 0;
5805 /* This is the earliest point at which we might know the assembler
5806 name of the function. Thus, if it's set before this, die horribly. */
5807 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5809 /* If #pragma weak was used, mark the decl weak now. */
5810 if (current_scope == file_scope)
5811 maybe_apply_pragma_weak (decl1);
5813 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5814 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5819 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5820 != integer_type_node)
5821 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
5823 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5824 args = TREE_CHAIN (args))
5826 tree type = args ? TREE_VALUE (args) : 0;
5828 if (type == void_type_node)
5835 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5836 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5841 if (TREE_CODE (type) != POINTER_TYPE
5842 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5843 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5845 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5850 if (TREE_CODE (type) != POINTER_TYPE
5851 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5852 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5854 pedwarn ("%Jthird argument of %qD should probably be "
5855 "%<char **%>", decl1, decl1);
5860 /* It is intentional that this message does not mention the third
5861 argument because it's only mentioned in an appendix of the
5863 if (argct > 0 && (argct < 2 || argct > 3))
5864 pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
5866 if (!TREE_PUBLIC (decl1))
5867 pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
5870 /* Record the decl so that the function name is defined.
5871 If we already have a decl for this name, and it is a FUNCTION_DECL,
5872 use the old decl. */
5874 current_function_decl = pushdecl (decl1);
5877 declare_parm_level ();
5879 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5880 /* Promote the value to int before returning it. */
5881 if (c_promoting_integer_type_p (restype))
5883 /* It retains unsignedness if not really getting wider. */
5884 if (TYPE_UNSIGNED (restype)
5885 && (TYPE_PRECISION (restype)
5886 == TYPE_PRECISION (integer_type_node)))
5887 restype = unsigned_type_node;
5889 restype = integer_type_node;
5892 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5893 DECL_ARTIFICIAL (resdecl) = 1;
5894 DECL_IGNORED_P (resdecl) = 1;
5895 DECL_RESULT (current_function_decl) = resdecl;
5897 start_fname_decls ();
5902 /* Subroutine of store_parm_decls which handles new-style function
5903 definitions (prototype format). The parms already have decls, so we
5904 need only record them as in effect and complain if any redundant
5905 old-style parm decls were written. */
5907 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5911 if (current_scope->bindings)
5913 error ("%Jold-style parameter declarations in prototyped "
5914 "function definition", fndecl);
5916 /* Get rid of the old-style declarations. */
5920 /* Don't issue this warning for nested functions, and don't issue this
5921 warning if we got here because ARG_INFO_TYPES was error_mark_node
5922 (this happens when a function definition has just an ellipsis in
5923 its parameter list). */
5924 else if (warn_traditional && !in_system_header && !current_function_scope
5925 && arg_info->types != error_mark_node)
5926 warning ("%Jtraditional C rejects ISO C style function definitions",
5929 /* Now make all the parameter declarations visible in the function body.
5930 We can bypass most of the grunt work of pushdecl. */
5931 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5933 DECL_CONTEXT (decl) = current_function_decl;
5934 if (DECL_NAME (decl))
5935 bind (DECL_NAME (decl), decl, current_scope,
5936 /*invisible=*/false, /*nested=*/false);
5938 error ("%Jparameter name omitted", decl);
5941 /* Record the parameter list in the function declaration. */
5942 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5944 /* Now make all the ancillary declarations visible, likewise. */
5945 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5947 DECL_CONTEXT (decl) = current_function_decl;
5948 if (DECL_NAME (decl))
5949 bind (DECL_NAME (decl), decl, current_scope,
5950 /*invisible=*/false, /*nested=*/false);
5953 /* And all the tag declarations. */
5954 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5955 if (TREE_PURPOSE (decl))
5956 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5957 /*invisible=*/false, /*nested=*/false);
5960 /* Subroutine of store_parm_decls which handles old-style function
5961 definitions (separate parameter list and declarations). */
5964 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5966 struct c_binding *b;
5967 tree parm, decl, last;
5968 tree parmids = arg_info->parms;
5970 /* We use DECL_WEAK as a flag to show which parameters have been
5971 seen already, since it is not used on PARM_DECL. */
5972 #ifdef ENABLE_CHECKING
5973 for (b = current_scope->bindings; b; b = b->prev)
5974 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5977 if (warn_old_style_definition && !in_system_header)
5978 warning ("%Jold-style function definition", fndecl);
5980 /* Match each formal parameter name with its declaration. Save each
5981 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5982 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5984 if (TREE_VALUE (parm) == 0)
5986 error ("%Jparameter name missing from parameter list", fndecl);
5987 TREE_PURPOSE (parm) = 0;
5991 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5992 if (b && B_IN_CURRENT_SCOPE (b))
5995 /* If we got something other than a PARM_DECL it is an error. */
5996 if (TREE_CODE (decl) != PARM_DECL)
5997 error ("%J%qD declared as a non-parameter", decl, decl);
5998 /* If the declaration is already marked, we have a duplicate
5999 name. Complain and ignore the duplicate. */
6000 else if (DECL_WEAK (decl))
6002 error ("%Jmultiple parameters named %qD", decl, decl);
6003 TREE_PURPOSE (parm) = 0;
6006 /* If the declaration says "void", complain and turn it into
6008 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6010 error ("%Jparameter %qD declared with void type", decl, decl);
6011 TREE_TYPE (decl) = integer_type_node;
6012 DECL_ARG_TYPE (decl) = integer_type_node;
6013 layout_decl (decl, 0);
6016 /* If no declaration found, default to int. */
6019 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6020 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6021 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6025 pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
6026 else if (extra_warnings)
6027 warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
6030 TREE_PURPOSE (parm) = decl;
6031 DECL_WEAK (decl) = 1;
6034 /* Now examine the parms chain for incomplete declarations
6035 and declarations with no corresponding names. */
6037 for (b = current_scope->bindings; b; b = b->prev)
6040 if (TREE_CODE (parm) != PARM_DECL)
6043 if (TREE_TYPE (parm) != error_mark_node
6044 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6046 error ("%Jparameter %qD has incomplete type", parm, parm);
6047 TREE_TYPE (parm) = error_mark_node;
6050 if (!DECL_WEAK (parm))
6052 error ("%Jdeclaration for parameter %qD but no such parameter",
6055 /* Pretend the parameter was not missing.
6056 This gets us to a standard state and minimizes
6057 further error messages. */
6058 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6062 /* Chain the declarations together in the order of the list of
6063 names. Store that chain in the function decl, replacing the
6064 list of names. Update the current scope to match. */
6065 DECL_ARGUMENTS (fndecl) = 0;
6067 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6068 if (TREE_PURPOSE (parm))
6070 if (parm && TREE_PURPOSE (parm))
6072 last = TREE_PURPOSE (parm);
6073 DECL_ARGUMENTS (fndecl) = last;
6074 DECL_WEAK (last) = 0;
6076 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6077 if (TREE_PURPOSE (parm))
6079 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6080 last = TREE_PURPOSE (parm);
6081 DECL_WEAK (last) = 0;
6083 TREE_CHAIN (last) = 0;
6086 /* If there was a previous prototype,
6087 set the DECL_ARG_TYPE of each argument according to
6088 the type previously specified, and report any mismatches. */
6090 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6093 for (parm = DECL_ARGUMENTS (fndecl),
6094 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6095 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6096 != void_type_node));
6097 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6099 if (parm == 0 || type == 0
6100 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6102 error ("number of arguments doesn%'t match prototype");
6103 error ("%Hprototype declaration",
6104 ¤t_function_prototype_locus);
6107 /* Type for passing arg must be consistent with that
6108 declared for the arg. ISO C says we take the unqualified
6109 type for parameters declared with qualified type. */
6110 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6111 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6113 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6114 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6116 /* Adjust argument to match prototype. E.g. a previous
6117 `int foo(float);' prototype causes
6118 `int foo(x) float x; {...}' to be treated like
6119 `int foo(float x) {...}'. This is particularly
6120 useful for argument types like uid_t. */
6121 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6123 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6124 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6125 && TYPE_PRECISION (TREE_TYPE (parm))
6126 < TYPE_PRECISION (integer_type_node))
6127 DECL_ARG_TYPE (parm) = integer_type_node;
6131 pedwarn ("promoted argument %qD "
6132 "doesn%'t match prototype", parm);
6133 pedwarn ("%Hprototype declaration",
6134 ¤t_function_prototype_locus);
6139 error ("argument %qD doesn%'t match prototype", parm);
6140 error ("%Hprototype declaration",
6141 ¤t_function_prototype_locus);
6145 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6148 /* Otherwise, create a prototype that would match. */
6152 tree actual = 0, last = 0, type;
6154 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6156 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6158 TREE_CHAIN (last) = type;
6163 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6165 TREE_CHAIN (last) = type;
6169 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6170 of the type of this function, but we need to avoid having this
6171 affect the types of other similarly-typed functions, so we must
6172 first force the generation of an identical (but separate) type
6173 node for the relevant function type. The new node we create
6174 will be a variant of the main variant of the original function
6177 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6179 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6183 /* Store parameter declarations passed in ARG_INFO into the current
6184 function declaration. */
6187 store_parm_decls_from (struct c_arg_info *arg_info)
6189 current_function_arg_info = arg_info;
6190 store_parm_decls ();
6193 /* Store the parameter declarations into the current function declaration.
6194 This is called after parsing the parameter declarations, before
6195 digesting the body of the function.
6197 For an old-style definition, construct a prototype out of the old-style
6198 parameter declarations and inject it into the function's type. */
6201 store_parm_decls (void)
6203 tree fndecl = current_function_decl;
6206 /* The argument information block for FNDECL. */
6207 struct c_arg_info *arg_info = current_function_arg_info;
6208 current_function_arg_info = 0;
6210 /* True if this definition is written with a prototype. Note:
6211 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6212 list in a function definition as equivalent to (void) -- an
6213 empty argument list specifies the function has no parameters,
6214 but only (void) sets up a prototype for future calls. */
6215 proto = arg_info->types != 0;
6218 store_parm_decls_newstyle (fndecl, arg_info);
6220 store_parm_decls_oldstyle (fndecl, arg_info);
6222 /* The next call to push_scope will be a function body. */
6224 next_is_function_body = true;
6226 /* Write a record describing this function definition to the prototypes
6227 file (if requested). */
6229 gen_aux_info_record (fndecl, 1, 0, proto);
6231 /* Initialize the RTL code for the function. */
6232 allocate_struct_function (fndecl);
6234 /* Begin the statement tree for this function. */
6235 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6237 /* ??? Insert the contents of the pending sizes list into the function
6238 to be evaluated. The only reason left to have this is
6239 void foo(int n, int array[n++])
6240 because we throw away the array type in favor of a pointer type, and
6241 thus won't naturally see the SAVE_EXPR containing the increment. All
6242 other pending sizes would be handled by gimplify_parameters. */
6245 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6246 add_stmt (TREE_VALUE (t));
6249 /* Even though we're inside a function body, we still don't want to
6250 call expand_expr to calculate the size of a variable-sized array.
6251 We haven't necessarily assigned RTL to all variables yet, so it's
6252 not safe to try to expand expressions involving them. */
6253 cfun->x_dont_save_pending_sizes_p = 1;
6256 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6260 c_warn_unused_result_recursively (tree fndecl)
6262 struct cgraph_node *cgn;
6264 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6265 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6267 /* Finalize all nested functions now. */
6268 cgn = cgraph_node (fndecl);
6269 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6270 c_warn_unused_result_recursively (cgn->decl);
6273 /* Finish up a function declaration and compile that function
6274 all the way to assembler language output. The free the storage
6275 for the function definition.
6277 This is called after parsing the body of the function definition. */
6280 finish_function (void)
6282 tree fndecl = current_function_decl;
6284 if (TREE_CODE (fndecl) == FUNCTION_DECL
6285 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6287 tree args = DECL_ARGUMENTS (fndecl);
6288 for (; args; args = TREE_CHAIN (args))
6290 tree type = TREE_TYPE (args);
6291 if (INTEGRAL_TYPE_P (type)
6292 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6293 DECL_ARG_TYPE (args) = integer_type_node;
6297 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6298 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6300 /* Must mark the RESULT_DECL as being in this function. */
6302 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6303 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6305 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6307 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6308 != integer_type_node)
6310 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6311 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6313 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
6318 c_finish_return (integer_zero_node);
6322 /* Tie off the statement tree for this function. */
6323 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6325 finish_fname_decls ();
6327 /* Complain if there's just no return statement. */
6328 if (warn_return_type
6329 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6330 && !current_function_returns_value && !current_function_returns_null
6331 /* Don't complain if we abort. */
6332 && !current_function_returns_abnormally
6333 /* Don't warn for main(). */
6334 && !MAIN_NAME_P (DECL_NAME (fndecl))
6335 /* Or if they didn't actually specify a return type. */
6336 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6337 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6338 inline function, as we might never be compiled separately. */
6339 && DECL_INLINE (fndecl))
6340 warning ("no return statement in function returning non-void");
6342 /* With just -Wextra, complain only if function returns both with
6343 and without a value. */
6345 && current_function_returns_value
6346 && current_function_returns_null)
6347 warning ("this function may return with or without a value");
6349 /* Store the end of the function, so that we get good line number
6350 info for the epilogue. */
6351 cfun->function_end_locus = input_location;
6353 /* If we don't have ctors/dtors sections, and this is a static
6354 constructor or destructor, it must be recorded now. */
6355 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6356 && !targetm.have_ctors_dtors)
6357 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6358 if (DECL_STATIC_DESTRUCTOR (fndecl)
6359 && !targetm.have_ctors_dtors)
6360 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6362 /* Finalize the ELF visibility for the function. */
6363 c_determine_visibility (fndecl);
6365 /* Genericize before inlining. Delay genericizing nested functions
6366 until their parent function is genericized. Since finalizing
6367 requires GENERIC, delay that as well. */
6369 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6371 if (!decl_function_context (fndecl))
6373 c_genericize (fndecl);
6374 c_warn_unused_result_recursively (fndecl);
6376 /* ??? Objc emits functions after finalizing the compilation unit.
6377 This should be cleaned up later and this conditional removed. */
6378 if (cgraph_global_info_ready)
6380 c_expand_body (fndecl);
6384 cgraph_finalize_function (fndecl, false);
6388 /* Register this function with cgraph just far enough to get it
6389 added to our parent's nested function list. Handy, since the
6390 C front end doesn't have such a list. */
6391 (void) cgraph_node (fndecl);
6395 /* We're leaving the context of this function, so zap cfun.
6396 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6397 tree_rest_of_compilation. */
6399 current_function_decl = NULL;
6402 /* Generate the RTL for the body of FNDECL. */
6405 c_expand_body (tree fndecl)
6408 if (!DECL_INITIAL (fndecl)
6409 || DECL_INITIAL (fndecl) == error_mark_node)
6412 tree_rest_of_compilation (fndecl);
6414 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6415 && targetm.have_ctors_dtors)
6416 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6417 DEFAULT_INIT_PRIORITY);
6418 if (DECL_STATIC_DESTRUCTOR (fndecl)
6419 && targetm.have_ctors_dtors)
6420 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6421 DEFAULT_INIT_PRIORITY);
6424 /* Check the declarations given in a for-loop for satisfying the C99
6427 check_for_loop_decls (void)
6429 struct c_binding *b;
6433 /* If we get here, declarations have been used in a for loop without
6434 the C99 for loop scope. This doesn't make much sense, so don't
6436 error ("%<for%> loop initial declaration used outside C99 mode");
6439 /* C99 subclause 6.8.5 paragraph 3:
6441 [#3] The declaration part of a for statement shall only
6442 declare identifiers for objects having storage class auto or
6445 It isn't clear whether, in this sentence, "identifiers" binds to
6446 "shall only declare" or to "objects" - that is, whether all identifiers
6447 declared must be identifiers for objects, or whether the restriction
6448 only applies to those that are. (A question on this in comp.std.c
6449 in November 2000 received no answer.) We implement the strictest
6450 interpretation, to avoid creating an extension which later causes
6453 for (b = current_scope->bindings; b; b = b->prev)
6456 tree decl = b->decl;
6461 switch (TREE_CODE (decl))
6464 if (TREE_STATIC (decl))
6465 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6466 "initial declaration", decl, decl);
6467 else if (DECL_EXTERNAL (decl))
6468 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6469 "initial declaration", decl, decl);
6473 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6477 error ("%<union %E%> declared in %<for%> loop initial declaration",
6481 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6485 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6486 "initial declaration", decl, decl);
6491 /* Save and reinitialize the variables
6492 used during compilation of a C function. */
6495 c_push_function_context (struct function *f)
6497 struct language_function *p;
6498 p = GGC_NEW (struct language_function);
6501 p->base.x_stmt_tree = c_stmt_tree;
6502 p->x_break_label = c_break_label;
6503 p->x_cont_label = c_cont_label;
6504 p->x_switch_stack = c_switch_stack;
6505 p->arg_info = current_function_arg_info;
6506 p->returns_value = current_function_returns_value;
6507 p->returns_null = current_function_returns_null;
6508 p->returns_abnormally = current_function_returns_abnormally;
6509 p->warn_about_return_type = warn_about_return_type;
6510 p->extern_inline = current_extern_inline;
6513 /* Restore the variables used during compilation of a C function. */
6516 c_pop_function_context (struct function *f)
6518 struct language_function *p = f->language;
6520 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6521 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6523 /* Stop pointing to the local nodes about to be freed. */
6524 /* But DECL_INITIAL must remain nonzero so we know this
6525 was an actual function definition. */
6526 DECL_INITIAL (current_function_decl) = error_mark_node;
6527 DECL_ARGUMENTS (current_function_decl) = 0;
6530 c_stmt_tree = p->base.x_stmt_tree;
6531 c_break_label = p->x_break_label;
6532 c_cont_label = p->x_cont_label;
6533 c_switch_stack = p->x_switch_stack;
6534 current_function_arg_info = p->arg_info;
6535 current_function_returns_value = p->returns_value;
6536 current_function_returns_null = p->returns_null;
6537 current_function_returns_abnormally = p->returns_abnormally;
6538 warn_about_return_type = p->warn_about_return_type;
6539 current_extern_inline = p->extern_inline;
6544 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6547 c_dup_lang_specific_decl (tree decl)
6549 struct lang_decl *ld;
6551 if (!DECL_LANG_SPECIFIC (decl))
6554 ld = GGC_NEW (struct lang_decl);
6555 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6556 DECL_LANG_SPECIFIC (decl) = ld;
6559 /* The functions below are required for functionality of doing
6560 function at once processing in the C front end. Currently these
6561 functions are not called from anywhere in the C front end, but as
6562 these changes continue, that will change. */
6564 /* Returns nonzero if the current statement is a full expression,
6565 i.e. temporaries created during that statement should be destroyed
6566 at the end of the statement. */
6569 stmts_are_full_exprs_p (void)
6574 /* Returns the stmt_tree (if any) to which statements are currently
6575 being added. If there is no active statement-tree, NULL is
6579 current_stmt_tree (void)
6581 return &c_stmt_tree;
6584 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6588 anon_aggr_type_p (tree ARG_UNUSED (node))
6593 /* Return the global value of T as a symbol. */
6596 identifier_global_value (tree t)
6598 struct c_binding *b;
6600 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6601 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6607 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6608 otherwise the name is found in ridpointers from RID_INDEX. */
6611 record_builtin_type (enum rid rid_index, const char *name, tree type)
6615 id = ridpointers[(int) rid_index];
6617 id = get_identifier (name);
6618 decl = build_decl (TYPE_DECL, id, type);
6620 if (debug_hooks->type_decl)
6621 debug_hooks->type_decl (decl, false);
6624 /* Build the void_list_node (void_type_node having been created). */
6626 build_void_list_node (void)
6628 tree t = build_tree_list (NULL_TREE, void_type_node);
6632 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6635 build_c_parm (struct c_declspecs *specs, tree attrs,
6636 struct c_declarator *declarator)
6638 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6641 ret->declarator = declarator;
6645 /* Return a declarator with nested attributes. TARGET is the inner
6646 declarator to which these attributes apply. ATTRS are the
6649 struct c_declarator *
6650 build_attrs_declarator (tree attrs, struct c_declarator *target)
6652 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6653 ret->kind = cdk_attrs;
6654 ret->declarator = target;
6655 ret->u.attrs = attrs;
6659 /* Return a declarator for a function with arguments specified by ARGS
6660 and return type specified by TARGET. */
6662 struct c_declarator *
6663 build_function_declarator (struct c_arg_info *args,
6664 struct c_declarator *target)
6666 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6667 ret->kind = cdk_function;
6668 ret->declarator = target;
6669 ret->u.arg_info = args;
6673 /* Return a declarator for the identifier IDENT (which may be
6674 NULL_TREE for an abstract declarator). */
6676 struct c_declarator *
6677 build_id_declarator (tree ident)
6679 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6681 ret->declarator = 0;
6686 /* Return something to represent absolute declarators containing a *.
6687 TARGET is the absolute declarator that the * contains.
6688 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6689 to apply to the pointer type. */
6691 struct c_declarator *
6692 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6693 struct c_declarator *target)
6697 struct c_declarator *itarget = target;
6698 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6699 if (type_quals_attrs)
6701 attrs = type_quals_attrs->attrs;
6702 quals = quals_from_declspecs (type_quals_attrs);
6703 if (attrs != NULL_TREE)
6704 itarget = build_attrs_declarator (attrs, target);
6706 ret->kind = cdk_pointer;
6707 ret->declarator = itarget;
6708 ret->u.pointer_quals = quals;
6712 /* Return a pointer to a structure for an empty list of declaration
6715 struct c_declspecs *
6716 build_null_declspecs (void)
6718 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6722 ret->typespec_word = cts_none;
6723 ret->storage_class = csc_none;
6724 ret->non_sc_seen_p = false;
6725 ret->typedef_p = false;
6726 ret->tag_defined_p = false;
6727 ret->explicit_signed_p = false;
6728 ret->deprecated_p = false;
6729 ret->default_int_p = false;
6730 ret->long_p = false;
6731 ret->long_long_p = false;
6732 ret->short_p = false;
6733 ret->signed_p = false;
6734 ret->unsigned_p = false;
6735 ret->complex_p = false;
6736 ret->inline_p = false;
6737 ret->thread_p = false;
6738 ret->const_p = false;
6739 ret->volatile_p = false;
6740 ret->restrict_p = false;
6744 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6747 struct c_declspecs *
6748 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6752 specs->non_sc_seen_p = true;
6753 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6754 && C_IS_RESERVED_WORD (qual));
6755 i = C_RID_CODE (qual);
6759 dupe = specs->const_p;
6760 specs->const_p = true;
6763 dupe = specs->volatile_p;
6764 specs->volatile_p = true;
6767 dupe = specs->restrict_p;
6768 specs->restrict_p = true;
6773 if (dupe && pedantic && !flag_isoc99)
6774 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
6778 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6781 struct c_declspecs *
6782 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6784 tree type = spec.spec;
6785 specs->non_sc_seen_p = true;
6786 if (TREE_DEPRECATED (type))
6787 specs->deprecated_p = true;
6789 /* Handle type specifier keywords. */
6790 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6792 enum rid i = C_RID_CODE (type);
6795 error ("two or more data types in declaration specifiers");
6798 if ((int) i <= (int) RID_LAST_MODIFIER)
6800 /* "long", "short", "signed", "unsigned" or "_Complex". */
6805 if (specs->long_long_p)
6807 error ("%<long long long%> is too long for GCC");
6812 if (specs->typespec_word == cts_double)
6814 error ("both %<long long%> and %<double%> in "
6815 "declaration specifiers");
6818 if (pedantic && !flag_isoc99 && !in_system_header
6820 pedwarn ("ISO C90 does not support %<long long%>");
6821 specs->long_long_p = 1;
6825 error ("both %<long%> and %<short%> in "
6826 "declaration specifiers");
6827 else if (specs->typespec_word == cts_void)
6828 error ("both %<long%> and %<void%> in "
6829 "declaration specifiers");
6830 else if (specs->typespec_word == cts_bool)
6831 error ("both %<long%> and %<_Bool%> in "
6832 "declaration specifiers");
6833 else if (specs->typespec_word == cts_char)
6834 error ("both %<long%> and %<char%> in "
6835 "declaration specifiers");
6836 else if (specs->typespec_word == cts_float)
6837 error ("both %<long%> and %<float%> in "
6838 "declaration specifiers");
6840 specs->long_p = true;
6843 dupe = specs->short_p;
6845 error ("both %<long%> and %<short%> in "
6846 "declaration specifiers");
6847 else if (specs->typespec_word == cts_void)
6848 error ("both %<short%> and %<void%> in "
6849 "declaration specifiers");
6850 else if (specs->typespec_word == cts_bool)
6851 error ("both %<short%> and %<_Bool%> in "
6852 "declaration specifiers");
6853 else if (specs->typespec_word == cts_char)
6854 error ("both %<short%> and %<char%> in "
6855 "declaration specifiers");
6856 else if (specs->typespec_word == cts_float)
6857 error ("both %<short%> and %<float%> in "
6858 "declaration specifiers");
6859 else if (specs->typespec_word == cts_double)
6860 error ("both %<short%> and %<double%> in "
6861 "declaration specifiers");
6863 specs->short_p = true;
6866 dupe = specs->signed_p;
6867 if (specs->unsigned_p)
6868 error ("both %<signed%> and %<unsigned%> in "
6869 "declaration specifiers");
6870 else if (specs->typespec_word == cts_void)
6871 error ("both %<signed%> and %<void%> in "
6872 "declaration specifiers");
6873 else if (specs->typespec_word == cts_bool)
6874 error ("both %<signed%> and %<_Bool%> in "
6875 "declaration specifiers");
6876 else if (specs->typespec_word == cts_float)
6877 error ("both %<signed%> and %<float%> in "
6878 "declaration specifiers");
6879 else if (specs->typespec_word == cts_double)
6880 error ("both %<signed%> and %<double%> in "
6881 "declaration specifiers");
6883 specs->signed_p = true;
6886 dupe = specs->unsigned_p;
6887 if (specs->signed_p)
6888 error ("both %<signed%> and %<unsigned%> in "
6889 "declaration specifiers");
6890 else if (specs->typespec_word == cts_void)
6891 error ("both %<unsigned%> and %<void%> in "
6892 "declaration specifiers");
6893 else if (specs->typespec_word == cts_bool)
6894 error ("both %<unsigned%> and %<_Bool%> in "
6895 "declaration specifiers");
6896 else if (specs->typespec_word == cts_float)
6897 error ("both %<unsigned%> and %<float%> in "
6898 "declaration specifiers");
6899 else if (specs->typespec_word == cts_double)
6900 error ("both %<unsigned%> and %<double%> in "
6901 "declaration specifiers");
6903 specs->unsigned_p = true;
6906 dupe = specs->complex_p;
6907 if (pedantic && !flag_isoc99 && !in_system_header)
6908 pedwarn ("ISO C90 does not support complex types");
6909 if (specs->typespec_word == cts_void)
6910 error ("both %<complex%> and %<void%> in "
6911 "declaration specifiers");
6912 else if (specs->typespec_word == cts_bool)
6913 error ("both %<complex%> and %<_Bool%> in "
6914 "declaration specifiers");
6916 specs->complex_p = true;
6923 error ("duplicate %qs", IDENTIFIER_POINTER (type));
6929 /* "void", "_Bool", "char", "int", "float" or "double". */
6930 if (specs->typespec_word != cts_none)
6932 error ("two or more data types in declaration specifiers");
6939 error ("both %<long%> and %<void%> in "
6940 "declaration specifiers");
6941 else if (specs->short_p)
6942 error ("both %<short%> and %<void%> in "
6943 "declaration specifiers");
6944 else if (specs->signed_p)
6945 error ("both %<signed%> and %<void%> in "
6946 "declaration specifiers");
6947 else if (specs->unsigned_p)
6948 error ("both %<unsigned%> and %<void%> in "
6949 "declaration specifiers");
6950 else if (specs->complex_p)
6951 error ("both %<complex%> and %<void%> in "
6952 "declaration specifiers");
6954 specs->typespec_word = cts_void;
6958 error ("both %<long%> and %<_Bool%> in "
6959 "declaration specifiers");
6960 else if (specs->short_p)
6961 error ("both %<short%> and %<_Bool%> in "
6962 "declaration specifiers");
6963 else if (specs->signed_p)
6964 error ("both %<signed%> and %<_Bool%> in "
6965 "declaration specifiers");
6966 else if (specs->unsigned_p)
6967 error ("both %<unsigned%> and %<_Bool%> in "
6968 "declaration specifiers");
6969 else if (specs->complex_p)
6970 error ("both %<complex%> and %<_Bool%> in "
6971 "declaration specifiers");
6973 specs->typespec_word = cts_bool;
6977 error ("both %<long%> and %<char%> in "
6978 "declaration specifiers");
6979 else if (specs->short_p)
6980 error ("both %<short%> and %<char%> in "
6981 "declaration specifiers");
6983 specs->typespec_word = cts_char;
6986 specs->typespec_word = cts_int;
6990 error ("both %<long%> and %<float%> in "
6991 "declaration specifiers");
6992 else if (specs->short_p)
6993 error ("both %<short%> and %<float%> in "
6994 "declaration specifiers");
6995 else if (specs->signed_p)
6996 error ("both %<signed%> and %<float%> in "
6997 "declaration specifiers");
6998 else if (specs->unsigned_p)
6999 error ("both %<unsigned%> and %<float%> in "
7000 "declaration specifiers");
7002 specs->typespec_word = cts_float;
7005 if (specs->long_long_p)
7006 error ("both %<long long%> and %<double%> in "
7007 "declaration specifiers");
7008 else if (specs->short_p)
7009 error ("both %<short%> and %<double%> in "
7010 "declaration specifiers");
7011 else if (specs->signed_p)
7012 error ("both %<signed%> and %<double%> in "
7013 "declaration specifiers");
7014 else if (specs->unsigned_p)
7015 error ("both %<unsigned%> and %<double%> in "
7016 "declaration specifiers");
7018 specs->typespec_word = cts_double;
7021 /* ObjC reserved word "id", handled below. */
7027 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7028 form of ObjC type, cases such as "int" and "long" being handled
7029 above), a TYPE (struct, union, enum and typeof specifiers) or an
7030 ERROR_MARK. In none of these cases may there have previously
7031 been any type specifiers. */
7032 if (specs->type || specs->typespec_word != cts_none
7033 || specs->long_p || specs->short_p || specs->signed_p
7034 || specs->unsigned_p || specs->complex_p)
7035 error ("two or more data types in declaration specifiers");
7036 else if (TREE_CODE (type) == TYPE_DECL)
7038 if (TREE_TYPE (type) == error_mark_node)
7039 ; /* Allow the type to default to int to avoid cascading errors. */
7042 specs->type = TREE_TYPE (type);
7043 specs->decl_attr = DECL_ATTRIBUTES (type);
7044 specs->typedef_p = true;
7045 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7048 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7050 tree t = lookup_name (type);
7051 if (!t || TREE_CODE (t) != TYPE_DECL)
7052 error ("%qs fails to be a typedef or built in type",
7053 IDENTIFIER_POINTER (type));
7054 else if (TREE_TYPE (t) == error_mark_node)
7057 specs->type = TREE_TYPE (t);
7059 else if (TREE_CODE (type) != ERROR_MARK)
7061 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7062 specs->tag_defined_p = true;
7063 if (spec.kind == ctsk_typeof)
7064 specs->typedef_p = true;
7071 /* Add the storage class specifier or function specifier SCSPEC to the
7072 declaration specifiers SPECS, returning SPECS. */
7074 struct c_declspecs *
7075 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7078 enum c_storage_class n = csc_none;
7080 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7081 && C_IS_RESERVED_WORD (scspec));
7082 i = C_RID_CODE (scspec);
7083 if (extra_warnings && specs->non_sc_seen_p)
7084 warning ("%qs is not at beginning of declaration",
7085 IDENTIFIER_POINTER (scspec));
7089 /* C99 permits duplicate inline. Although of doubtful utility,
7090 it seems simplest to permit it in gnu89 mode as well, as
7091 there is also little utility in maintaining this as a
7092 difference between gnu89 and C99 inline. */
7094 specs->inline_p = true;
7097 dupe = specs->thread_p;
7098 if (specs->storage_class == csc_auto)
7099 error ("%<__thread%> used with %<auto%>");
7100 else if (specs->storage_class == csc_register)
7101 error ("%<__thread%> used with %<register%>");
7102 else if (specs->storage_class == csc_typedef)
7103 error ("%<__thread%> used with %<typedef%>");
7105 specs->thread_p = true;
7112 /* Diagnose "__thread extern". */
7113 if (specs->thread_p)
7114 error ("%<__thread%> before %<extern%>");
7121 /* Diagnose "__thread static". */
7122 if (specs->thread_p)
7123 error ("%<__thread%> before %<static%>");
7131 if (n != csc_none && n == specs->storage_class)
7134 error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
7137 if (specs->storage_class != csc_none && n != specs->storage_class)
7139 error ("multiple storage classes in declaration specifiers");
7143 specs->storage_class = n;
7144 if (n != csc_extern && n != csc_static && specs->thread_p)
7146 error ("%<__thread%> used with %qs",
7147 IDENTIFIER_POINTER (scspec));
7148 specs->thread_p = false;
7155 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7158 struct c_declspecs *
7159 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7161 specs->attrs = chainon (attrs, specs->attrs);
7165 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7166 specifiers with any other type specifier to determine the resulting
7167 type. This is where ISO C checks on complex types are made, since
7168 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7171 struct c_declspecs *
7172 finish_declspecs (struct c_declspecs *specs)
7174 /* If a type was specified as a whole, we have no modifiers and are
7176 if (specs->type != NULL_TREE)
7178 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7179 && !specs->signed_p && !specs->unsigned_p
7180 && !specs->complex_p);
7184 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7185 has been specified, treat it as "int" unless "_Complex" is
7186 present and there are no other specifiers. If we just have
7187 "_Complex", it is equivalent to "_Complex double", but e.g.
7188 "_Complex short" is equivalent to "_Complex short int". */
7189 if (specs->typespec_word == cts_none)
7191 if (specs->long_p || specs->short_p
7192 || specs->signed_p || specs->unsigned_p)
7194 specs->typespec_word = cts_int;
7196 else if (specs->complex_p)
7198 specs->typespec_word = cts_double;
7200 pedwarn ("ISO C does not support plain %<complex%> meaning "
7201 "%<double complex%>");
7205 specs->typespec_word = cts_int;
7206 specs->default_int_p = true;
7207 /* We don't diagnose this here because grokdeclarator will
7208 give more specific diagnostics according to whether it is
7209 a function definition. */
7213 /* If "signed" was specified, record this to distinguish "int" and
7214 "signed int" in the case of a bit-field with
7215 -funsigned-bitfields. */
7216 specs->explicit_signed_p = specs->signed_p;
7218 /* Now compute the actual type. */
7219 switch (specs->typespec_word)
7222 gcc_assert (!specs->long_p && !specs->short_p
7223 && !specs->signed_p && !specs->unsigned_p
7224 && !specs->complex_p);
7225 specs->type = void_type_node;
7228 gcc_assert (!specs->long_p && !specs->short_p
7229 && !specs->signed_p && !specs->unsigned_p
7230 && !specs->complex_p);
7231 specs->type = boolean_type_node;
7234 gcc_assert (!specs->long_p && !specs->short_p);
7235 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7236 if (specs->signed_p)
7237 specs->type = signed_char_type_node;
7238 else if (specs->unsigned_p)
7239 specs->type = unsigned_char_type_node;
7241 specs->type = char_type_node;
7242 if (specs->complex_p)
7245 pedwarn ("ISO C does not support complex integer types");
7246 specs->type = build_complex_type (specs->type);
7250 gcc_assert (!(specs->long_p && specs->short_p));
7251 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7252 if (specs->long_long_p)
7253 specs->type = (specs->unsigned_p
7254 ? long_long_unsigned_type_node
7255 : long_long_integer_type_node);
7256 else if (specs->long_p)
7257 specs->type = (specs->unsigned_p
7258 ? long_unsigned_type_node
7259 : long_integer_type_node);
7260 else if (specs->short_p)
7261 specs->type = (specs->unsigned_p
7262 ? short_unsigned_type_node
7263 : short_integer_type_node);
7265 specs->type = (specs->unsigned_p
7266 ? unsigned_type_node
7267 : integer_type_node);
7268 if (specs->complex_p)
7271 pedwarn ("ISO C does not support complex integer types");
7272 specs->type = build_complex_type (specs->type);
7276 gcc_assert (!specs->long_p && !specs->short_p
7277 && !specs->signed_p && !specs->unsigned_p);
7278 specs->type = (specs->complex_p
7279 ? complex_float_type_node
7283 gcc_assert (!specs->long_long_p && !specs->short_p
7284 && !specs->signed_p && !specs->unsigned_p);
7287 specs->type = (specs->complex_p
7288 ? complex_long_double_type_node
7289 : long_double_type_node);
7293 specs->type = (specs->complex_p
7294 ? complex_double_type_node
7295 : double_type_node);
7305 /* Synthesize a function which calls all the global ctors or global
7306 dtors in this file. This is only used for targets which do not
7307 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7309 build_cdtor (int method_type, tree cdtors)
7316 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7317 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7320 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7323 /* Perform final processing on one file scope's declarations (or the
7324 external scope's declarations), GLOBALS. */
7326 c_write_global_declarations_1 (tree globals)
7328 size_t len = list_length (globals);
7329 tree *vec = XNEWVEC (tree, len);
7333 /* Process the decls in the order they were written. */
7334 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7337 /* Check for used but undefined static functions using the C
7338 standard's definition of "used", and set TREE_NO_WARNING so
7339 that check_global_declarations doesn't repeat the check. */
7340 if (TREE_CODE (decl) == FUNCTION_DECL
7341 && DECL_INITIAL (decl) == 0
7342 && DECL_EXTERNAL (decl)
7343 && !TREE_PUBLIC (decl)
7344 && C_DECL_USED (decl))
7346 pedwarn ("%J%qF used but never defined", decl, decl);
7347 TREE_NO_WARNING (decl) = 1;
7351 wrapup_global_declarations (vec, len);
7352 check_global_declarations (vec, len);
7358 c_write_global_declarations (void)
7362 /* We don't want to do this if generating a PCH. */
7366 /* Don't waste time on further processing if -fsyntax-only or we've
7367 encountered errors. */
7368 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7371 /* Close the external scope. */
7372 ext_block = pop_scope ();
7374 gcc_assert (!current_scope);
7376 /* Process all file scopes in this compilation, and the external_scope,
7377 through wrapup_global_declarations and check_global_declarations. */
7378 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7379 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7380 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7382 /* Generate functions to call static constructors and destructors
7383 for targets that do not support .ctors/.dtors sections. These
7384 functions have magic names which are detected by collect2. */
7385 build_cdtor ('I', static_ctors); static_ctors = 0;
7386 build_cdtor ('D', static_dtors); static_dtors = 0;
7388 /* We're done parsing; proceed to optimize and emit assembly.
7389 FIXME: shouldn't be the front end's responsibility to call this. */
7393 #include "gt-c-decl.h"