1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
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"
36 #include "tree-inline.h"
48 #include "c-family/c-common.h"
49 #include "c-family/c-objc.h"
50 #include "c-family/c-pragma.h"
52 #include "langhooks.h"
53 #include "tree-iterator.h"
54 #include "diagnostic-core.h"
55 #include "tree-dump.h"
58 #include "langhooks-def.h"
59 #include "pointer-set.h"
61 #include "c-family/c-ada-spec.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) */
71 /* States indicating how grokdeclarator() should handle declspecs marked
72 with __attribute__((deprecated)). An object declared as
73 __attribute__((deprecated)) suppresses warnings of uses of other
76 enum deprecated_states {
82 /* Nonzero if we have seen an invalid cross reference
83 to a struct, union, or enum, but not yet printed the message. */
84 tree pending_invalid_xref;
86 /* File and line to appear in the eventual error message. */
87 location_t pending_invalid_xref_location;
89 /* The file and line that the prototype came from if this is an
90 old-style definition; used for diagnostics in
91 store_parm_decls_oldstyle. */
93 static location_t current_function_prototype_locus;
95 /* Whether this prototype was built-in. */
97 static bool current_function_prototype_built_in;
99 /* The argument type information of this prototype. */
101 static tree current_function_prototype_arg_types;
103 /* The argument information structure for the function currently being
106 static struct c_arg_info *current_function_arg_info;
108 /* The obstack on which parser and related data structures, which are
109 not live beyond their top-level declaration or definition, are
111 struct obstack parser_obstack;
113 /* The current statement tree. */
115 static GTY(()) struct stmt_tree_s c_stmt_tree;
117 /* State saving variables. */
121 /* A list of decls to be made automatically visible in each file scope. */
122 static GTY(()) tree visible_builtins;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a call to a noreturn function is seen. */
137 int current_function_returns_abnormally;
139 /* Set to nonzero by `grokdeclarator' for a function
140 whose return type is defaulted, if warnings for this are desired. */
142 static int warn_about_return_type;
144 /* Nonzero when the current toplevel function contains a declaration
145 of a nested function which is never defined. */
147 static bool undef_nested_function;
150 /* Each c_binding structure describes one binding of an identifier to
151 a decl. All the decls in a scope - irrespective of namespace - are
152 chained together by the ->prev field, which (as the name implies)
153 runs in reverse order. All the decls in a given namespace bound to
154 a given identifier are chained by the ->shadowed field, which runs
155 from inner to outer scopes.
157 The ->decl field usually points to a DECL node, but there are two
158 exceptions. In the namespace of type tags, the bound entity is a
159 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
160 identifier is encountered, it is bound to error_mark_node to
161 suppress further errors about that identifier in the current
164 The ->u.type field stores the type of the declaration in this scope;
165 if NULL, the type is the type of the ->decl field. This is only of
166 relevance for objects with external or internal linkage which may
167 be redeclared in inner scopes, forming composite types that only
168 persist for the duration of those scopes. In the external scope,
169 this stores the composite of all the types declared for this
170 object, visible or not. The ->inner_comp field (used only at file
171 scope) stores whether an incomplete array type at file scope was
172 completed at an inner scope to an array size other than 1.
174 The ->u.label field is used for labels. It points to a structure
175 which stores additional information used for warnings.
177 The depth field is copied from the scope structure that holds this
178 decl. It is used to preserve the proper ordering of the ->shadowed
179 field (see bind()) and also for a handful of special-case checks.
180 Finally, the invisible bit is true for a decl which should be
181 ignored for purposes of normal name lookup, and the nested bit is
182 true for a decl that's been bound a second time in an inner scope;
183 in all such cases, the binding in the outer scope will have its
184 invisible bit true. */
186 struct GTY((chain_next ("%h.prev"))) c_binding {
187 union GTY(()) { /* first so GTY desc can use decl */
188 tree GTY((tag ("0"))) type; /* the type in this scope */
189 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
190 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
191 tree decl; /* the decl bound */
192 tree id; /* the identifier it's bound to */
193 struct c_binding *prev; /* the previous decl in this scope */
194 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
195 unsigned int depth : 28; /* depth of this scope */
196 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
197 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
198 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
199 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
200 location_t locus; /* location for nested bindings */
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 GTY(()) lang_identifier {
227 struct c_common_identifier common_id;
228 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
229 struct c_binding *tag_binding; /* struct/union/enum tags */
230 struct c_binding *label_binding; /* labels */
233 /* Validate c-lang.c's assumptions. */
234 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
235 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
237 /* The resulting tree type. */
239 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
240 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
242 union tree_node GTY ((tag ("0"),
243 desc ("tree_node_structure (&%h)")))
245 struct lang_identifier GTY ((tag ("1"))) identifier;
248 /* Track bindings and other things that matter for goto warnings. For
249 efficiency, we do not gather all the decls at the point of
250 definition. Instead, we point into the bindings structure. As
251 scopes are popped, we update these structures and gather the decls
252 that matter at that time. */
254 struct GTY(()) c_spot_bindings {
255 /* The currently open scope which holds bindings defined when the
256 label was defined or the goto statement was found. */
257 struct c_scope *scope;
258 /* The bindings in the scope field which were defined at the point
259 of the label or goto. This lets us look at older or newer
260 bindings in the scope, as appropriate. */
261 struct c_binding *bindings_in_scope;
262 /* The number of statement expressions that have started since this
263 label or goto statement was defined. This is zero if we are at
264 the same statement expression level. It is positive if we are in
265 a statement expression started since this spot. It is negative
266 if this spot was in a statement expression and we have left
269 /* Whether we started in a statement expression but are no longer in
270 it. This is set to true if stmt_exprs ever goes negative. */
274 /* This structure is used to keep track of bindings seen when a goto
275 statement is defined. This is only used if we see the goto
276 statement before we see the label. */
278 struct GTY(()) c_goto_bindings {
279 /* The location of the goto statement. */
281 /* The bindings of the goto statement. */
282 struct c_spot_bindings goto_bindings;
285 typedef struct c_goto_bindings *c_goto_bindings_p;
286 DEF_VEC_P(c_goto_bindings_p);
287 DEF_VEC_ALLOC_P(c_goto_bindings_p,gc);
289 /* The additional information we keep track of for a label binding.
290 These fields are updated as scopes are popped. */
292 struct GTY(()) c_label_vars {
293 /* The shadowed c_label_vars, when one label shadows another (which
294 can only happen using a __label__ declaration). */
295 struct c_label_vars *shadowed;
296 /* The bindings when the label was defined. */
297 struct c_spot_bindings label_bindings;
298 /* A list of decls that we care about: decls about which we should
299 warn if a goto branches to this label from later in the function.
300 Decls are added to this list as scopes are popped. We only add
301 the decls that matter. */
302 VEC(tree,gc) *decls_in_scope;
303 /* A list of goto statements to this label. This is only used for
304 goto statements seen before the label was defined, so that we can
305 issue appropriate warnings for them. */
306 VEC(c_goto_bindings_p,gc) *gotos;
309 /* Each c_scope structure describes the complete contents of one
310 scope. Four scopes are distinguished specially: the innermost or
311 current scope, the innermost function scope, the file scope (always
312 the second to outermost) and the outermost or external scope.
314 Most declarations are recorded in the current scope.
316 All normal label declarations are recorded in the innermost
317 function scope, as are bindings of undeclared identifiers to
318 error_mark_node. (GCC permits nested functions as an extension,
319 hence the 'innermost' qualifier.) Explicitly declared labels
320 (using the __label__ extension) appear in the current scope.
322 Being in the file scope (current_scope == file_scope) causes
323 special behavior in several places below. Also, under some
324 conditions the Objective-C front end records declarations in the
325 file scope even though that isn't the current scope.
327 All declarations with external linkage are recorded in the external
328 scope, even if they aren't visible there; this models the fact that
329 such declarations are visible to the entire program, and (with a
330 bit of cleverness, see pushdecl) allows diagnosis of some violations
331 of C99 6.2.2p7 and 6.2.7p2:
333 If, within the same translation unit, the same identifier appears
334 with both internal and external linkage, the behavior is
337 All declarations that refer to the same object or function shall
338 have compatible type; otherwise, the behavior is undefined.
340 Initially only the built-in declarations, which describe compiler
341 intrinsic functions plus a subset of the standard library, are in
344 The order of the blocks list matters, and it is frequently appended
345 to. To avoid having to walk all the way to the end of the list on
346 each insertion, or reverse the list later, we maintain a pointer to
347 the last list entry. (FIXME: It should be feasible to use a reversed
350 The bindings list is strictly in reverse order of declarations;
351 pop_scope relies on this. */
354 struct GTY((chain_next ("%h.outer"))) c_scope {
355 /* The scope containing this one. */
356 struct c_scope *outer;
358 /* The next outermost function scope. */
359 struct c_scope *outer_function;
361 /* All bindings in this scope. */
362 struct c_binding *bindings;
364 /* For each scope (except the global one), a chain of BLOCK nodes
365 for all the scopes that were entered and exited one level down. */
369 /* The depth of this scope. Used to keep the ->shadowed chain of
370 bindings sorted innermost to outermost. */
371 unsigned int depth : 28;
373 /* True if we are currently filling this scope with parameter
375 BOOL_BITFIELD parm_flag : 1;
377 /* True if we saw [*] in this scope. Used to give an error messages
378 if these appears in a function definition. */
379 BOOL_BITFIELD had_vla_unspec : 1;
381 /* True if we already complained about forward parameter decls
382 in this scope. This prevents double warnings on
383 foo (int a; int b; ...) */
384 BOOL_BITFIELD warned_forward_parm_decls : 1;
386 /* True if this is the outermost block scope of a function body.
387 This scope contains the parameters, the local variables declared
388 in the outermost block, and all the labels (except those in
389 nested functions, or declared at block scope with __label__). */
390 BOOL_BITFIELD function_body : 1;
392 /* True means make a BLOCK for this scope no matter what. */
393 BOOL_BITFIELD keep : 1;
395 /* True means that an unsuffixed float constant is _Decimal64. */
396 BOOL_BITFIELD float_const_decimal64 : 1;
398 /* True if this scope has any label bindings. This is used to speed
399 up searching for labels when popping scopes, particularly since
400 labels are normally only found at function scope. */
401 BOOL_BITFIELD has_label_bindings : 1;
403 /* True if we should issue a warning if a goto statement crosses any
404 of the bindings. We still need to check the list of bindings to
405 find the specific ones we need to warn about. This is true if
406 decl_jump_unsafe would return true for any of the bindings. This
407 is used to avoid looping over all the bindings unnecessarily. */
408 BOOL_BITFIELD has_jump_unsafe_decl : 1;
411 /* The scope currently in effect. */
413 static GTY(()) struct c_scope *current_scope;
415 /* The innermost function scope. Ordinary (not explicitly declared)
416 labels, bindings to error_mark_node, and the lazily-created
417 bindings of __func__ and its friends get this scope. */
419 static GTY(()) struct c_scope *current_function_scope;
421 /* The C file scope. This is reset for each input translation unit. */
423 static GTY(()) struct c_scope *file_scope;
425 /* The outermost scope. This is used for all declarations with
426 external linkage, and only these, hence the name. */
428 static GTY(()) struct c_scope *external_scope;
430 /* A chain of c_scope structures awaiting reuse. */
432 static GTY((deletable)) struct c_scope *scope_freelist;
434 /* A chain of c_binding structures awaiting reuse. */
436 static GTY((deletable)) struct c_binding *binding_freelist;
438 /* Append VAR to LIST in scope SCOPE. */
439 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
440 struct c_scope *s_ = (scope); \
442 if (s_->list##_last) \
443 BLOCK_CHAIN (s_->list##_last) = d_; \
446 s_->list##_last = d_; \
449 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
450 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
451 struct c_scope *t_ = (tscope); \
452 struct c_scope *f_ = (fscope); \
454 BLOCK_CHAIN (t_->to##_last) = f_->from; \
457 t_->to##_last = f_->from##_last; \
460 /* A c_inline_static structure stores details of a static identifier
461 referenced in a definition of a function that may be an inline
462 definition if no subsequent declaration of that function uses
463 "extern" or does not use "inline". */
465 struct GTY((chain_next ("%h.next"))) c_inline_static {
466 /* The location for a diagnostic. */
469 /* The function that may be an inline definition. */
472 /* The object or function referenced. */
475 /* What sort of reference this is. */
476 enum c_inline_static_type type;
478 /* The next such structure or NULL. */
479 struct c_inline_static *next;
482 /* List of static identifiers used or referenced in functions that may
483 be inline definitions. */
484 static GTY(()) struct c_inline_static *c_inline_statics;
486 /* True means unconditionally make a BLOCK for the next scope pushed. */
488 static bool keep_next_level_flag;
490 /* True means the next call to push_scope will be the outermost scope
491 of a function body, so do not push a new scope, merely cease
492 expecting parameter decls. */
494 static bool next_is_function_body;
496 /* A VEC of pointers to c_binding structures. */
498 typedef struct c_binding *c_binding_ptr;
499 DEF_VEC_P(c_binding_ptr);
500 DEF_VEC_ALLOC_P(c_binding_ptr,heap);
502 /* Information that we keep for a struct or union while it is being
505 struct c_struct_parse_info
507 /* If warn_cxx_compat, a list of types defined within this
509 VEC(tree,heap) *struct_types;
510 /* If warn_cxx_compat, a list of field names which have bindings,
511 and which are defined in this struct, but which are not defined
512 in any enclosing struct. This is used to clear the in_struct
513 field of the c_bindings structure. */
514 VEC(c_binding_ptr,heap) *fields;
515 /* If warn_cxx_compat, a list of typedef names used when defining
516 fields in this struct. */
517 VEC(tree,heap) *typedefs_seen;
520 /* Information for the struct or union currently being parsed, or
521 NULL if not parsing a struct or union. */
522 static struct c_struct_parse_info *struct_parse_info;
524 /* Forward declarations. */
525 static tree lookup_name_in_scope (tree, struct c_scope *);
526 static tree c_make_fname_decl (location_t, tree, int);
527 static tree grokdeclarator (const struct c_declarator *,
528 struct c_declspecs *,
529 enum decl_context, bool, tree *, tree *, tree *,
530 bool *, enum deprecated_states);
531 static tree grokparms (struct c_arg_info *, bool);
532 static void layout_array_type (tree);
534 /* T is a statement. Add it to the statement-tree. This is the
535 C/ObjC version--C++ has a slightly different version of this
541 enum tree_code code = TREE_CODE (t);
543 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
545 if (!EXPR_HAS_LOCATION (t))
546 SET_EXPR_LOCATION (t, input_location);
549 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
550 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
552 /* Add T to the statement-tree. Non-side-effect statements need to be
553 recorded during statement expressions. */
554 if (!building_stmt_list_p ())
556 append_to_statement_list_force (t, &cur_stmt_list);
561 /* Return true if we will want to say something if a goto statement
565 decl_jump_unsafe (tree decl)
567 if (error_operand_p (decl))
570 /* Always warn about crossing variably modified types. */
571 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
572 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
575 /* Otherwise, only warn if -Wgoto-misses-init and this is an
576 initialized automatic decl. */
577 if (warn_jump_misses_init
578 && TREE_CODE (decl) == VAR_DECL
579 && !TREE_STATIC (decl)
580 && DECL_INITIAL (decl) != NULL_TREE)
588 c_print_identifier (FILE *file, tree node, int indent)
590 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
591 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
592 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
593 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
595 tree rid = ridpointers[C_RID_CODE (node)];
596 indent_to (file, indent + 4);
597 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
598 (void *) rid, IDENTIFIER_POINTER (rid));
602 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
603 which may be any of several kinds of DECL or TYPE or error_mark_node,
604 in the scope SCOPE. */
606 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
607 bool nested, location_t locus)
609 struct c_binding *b, **here;
611 if (binding_freelist)
613 b = binding_freelist;
614 binding_freelist = b->prev;
617 b = ggc_alloc_c_binding ();
622 b->depth = scope->depth;
623 b->invisible = invisible;
631 b->prev = scope->bindings;
634 if (decl_jump_unsafe (decl))
635 scope->has_jump_unsafe_decl = 1;
640 switch (TREE_CODE (decl))
642 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
645 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
651 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
657 /* Locate the appropriate place in the chain of shadowed decls
658 to insert this binding. Normally, scope == current_scope and
659 this does nothing. */
660 while (*here && (*here)->depth > scope->depth)
661 here = &(*here)->shadowed;
667 /* Clear the binding structure B, stick it on the binding_freelist,
668 and return the former value of b->prev. This is used by pop_scope
669 and get_parm_info to iterate destructively over all the bindings
670 from a given scope. */
671 static struct c_binding *
672 free_binding_and_advance (struct c_binding *b)
674 struct c_binding *prev = b->prev;
676 memset (b, 0, sizeof (struct c_binding));
677 b->prev = binding_freelist;
678 binding_freelist = b;
683 /* Bind a label. Like bind, but skip fields which aren't used for
684 labels, and add the LABEL_VARS value. */
686 bind_label (tree name, tree label, struct c_scope *scope,
687 struct c_label_vars *label_vars)
691 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
694 scope->has_label_bindings = true;
697 gcc_assert (b->decl == label);
698 label_vars->shadowed = b->u.label;
699 b->u.label = label_vars;
702 /* Hook called at end of compilation to assume 1 elt
703 for a file-scope tentative array defn that wasn't complete before. */
706 c_finish_incomplete_decl (tree decl)
708 if (TREE_CODE (decl) == VAR_DECL)
710 tree type = TREE_TYPE (decl);
711 if (type != error_mark_node
712 && TREE_CODE (type) == ARRAY_TYPE
713 && !DECL_EXTERNAL (decl)
714 && TYPE_DOMAIN (type) == 0)
716 warning_at (DECL_SOURCE_LOCATION (decl),
717 0, "array %q+D assumed to have one element", decl);
719 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
721 relayout_decl (decl);
726 /* Record that inline function FUNC contains a reference (location
727 LOC) to static DECL (file-scope or function-local according to
731 record_inline_static (location_t loc, tree func, tree decl,
732 enum c_inline_static_type type)
734 struct c_inline_static *csi = ggc_alloc_c_inline_static ();
736 csi->function = func;
737 csi->static_decl = decl;
739 csi->next = c_inline_statics;
740 c_inline_statics = csi;
743 /* Check for references to static declarations in inline functions at
744 the end of the translation unit and diagnose them if the functions
745 are still inline definitions. */
748 check_inline_statics (void)
750 struct c_inline_static *csi;
751 for (csi = c_inline_statics; csi; csi = csi->next)
753 if (DECL_EXTERNAL (csi->function))
757 pedwarn (csi->location, 0,
758 "%qD is static but used in inline function %qD "
759 "which is not static", csi->static_decl, csi->function);
762 pedwarn (csi->location, 0,
763 "%q+D is static but declared in inline function %qD "
764 "which is not static", csi->static_decl, csi->function);
770 c_inline_statics = NULL;
773 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
774 for the current state, otherwise set it to uninitialized. */
777 set_spot_bindings (struct c_spot_bindings *p, bool defining)
781 p->scope = current_scope;
782 p->bindings_in_scope = current_scope->bindings;
787 p->bindings_in_scope = NULL;
790 p->left_stmt_expr = false;
793 /* Update spot bindings P as we pop out of SCOPE. Return true if we
794 should push decls for a label. */
797 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
799 if (p->scope != scope)
801 /* This label or goto is defined in some other scope, or it is a
802 label which is not yet defined. There is nothing to
807 /* Adjust the spot bindings to refer to the bindings already defined
808 in the enclosing scope. */
809 p->scope = scope->outer;
810 p->bindings_in_scope = p->scope->bindings;
815 /* The Objective-C front-end often needs to determine the current scope. */
818 objc_get_current_scope (void)
820 return current_scope;
823 /* The following function is used only by Objective-C. It needs to live here
824 because it accesses the innards of c_scope. */
827 objc_mark_locals_volatile (void *enclosing_blk)
829 struct c_scope *scope;
832 for (scope = current_scope;
833 scope && scope != enclosing_blk;
834 scope = scope->outer)
836 for (b = scope->bindings; b; b = b->prev)
837 objc_volatilize_decl (b->decl);
839 /* Do not climb up past the current function. */
840 if (scope->function_body)
845 /* Return true if we are in the global binding level. */
848 global_bindings_p (void)
850 return current_scope == file_scope;
854 keep_next_level (void)
856 keep_next_level_flag = true;
859 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
862 set_float_const_decimal64 (void)
864 current_scope->float_const_decimal64 = true;
867 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
870 clear_float_const_decimal64 (void)
872 current_scope->float_const_decimal64 = false;
875 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
878 float_const_decimal64_p (void)
880 return current_scope->float_const_decimal64;
883 /* Identify this scope as currently being filled with parameters. */
886 declare_parm_level (void)
888 current_scope->parm_flag = true;
894 if (next_is_function_body)
896 /* This is the transition from the parameters to the top level
897 of the function body. These are the same scope
898 (C99 6.2.1p4,6) so we do not push another scope structure.
899 next_is_function_body is set only by store_parm_decls, which
900 in turn is called when and only when we are about to
901 encounter the opening curly brace for the function body.
903 The outermost block of a function always gets a BLOCK node,
904 because the debugging output routines expect that each
905 function has at least one BLOCK. */
906 current_scope->parm_flag = false;
907 current_scope->function_body = true;
908 current_scope->keep = true;
909 current_scope->outer_function = current_function_scope;
910 current_function_scope = current_scope;
912 keep_next_level_flag = false;
913 next_is_function_body = false;
915 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
916 if (current_scope->outer)
917 current_scope->float_const_decimal64
918 = current_scope->outer->float_const_decimal64;
920 current_scope->float_const_decimal64 = false;
924 struct c_scope *scope;
927 scope = scope_freelist;
928 scope_freelist = scope->outer;
931 scope = ggc_alloc_cleared_c_scope ();
933 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
935 scope->float_const_decimal64 = current_scope->float_const_decimal64;
937 scope->float_const_decimal64 = false;
939 scope->keep = keep_next_level_flag;
940 scope->outer = current_scope;
941 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
943 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
945 if (current_scope && scope->depth == 0)
948 sorry ("GCC supports only %u nested scopes", scope->depth);
951 current_scope = scope;
952 keep_next_level_flag = false;
956 /* This is called when we are leaving SCOPE. For each label defined
957 in SCOPE, add any appropriate decls to its decls_in_scope fields.
958 These are the decls whose initialization will be skipped by a goto
959 later in the function. */
962 update_label_decls (struct c_scope *scope)
969 if (s->has_label_bindings)
973 for (b = s->bindings; b != NULL; b = b->prev)
975 struct c_label_vars *label_vars;
976 struct c_binding *b1;
979 struct c_goto_bindings *g;
981 if (TREE_CODE (b->decl) != LABEL_DECL)
983 label_vars = b->u.label;
985 b1 = label_vars->label_bindings.bindings_in_scope;
986 if (label_vars->label_bindings.scope == NULL)
989 hjud = label_vars->label_bindings.scope->has_jump_unsafe_decl;
990 if (update_spot_bindings (scope, &label_vars->label_bindings))
992 /* This label is defined in this scope. */
995 for (; b1 != NULL; b1 = b1->prev)
997 /* A goto from later in the function to this
998 label will never see the initialization
999 of B1, if any. Save it to issue a
1000 warning if needed. */
1001 if (decl_jump_unsafe (b1->decl))
1002 VEC_safe_push (tree, gc,
1003 label_vars->decls_in_scope,
1009 /* Update the bindings of any goto statements associated
1011 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
1012 update_spot_bindings (scope, &g->goto_bindings);
1016 /* Don't search beyond the current function. */
1017 if (s == current_function_scope)
1024 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1027 set_type_context (tree type, tree context)
1029 for (type = TYPE_MAIN_VARIANT (type); type;
1030 type = TYPE_NEXT_VARIANT (type))
1031 TYPE_CONTEXT (type) = context;
1034 /* Exit a scope. Restore the state of the identifier-decl mappings
1035 that were in effect when this scope was entered. Return a BLOCK
1036 node containing all the DECLs in this scope that are of interest
1037 to debug info generation. */
1042 struct c_scope *scope = current_scope;
1043 tree block, context, p;
1044 struct c_binding *b;
1046 bool functionbody = scope->function_body;
1047 bool keep = functionbody || scope->keep || scope->bindings;
1049 update_label_decls (scope);
1051 /* If appropriate, create a BLOCK to record the decls for the life
1052 of this function. */
1056 block = make_node (BLOCK);
1057 BLOCK_SUBBLOCKS (block) = scope->blocks;
1058 TREE_USED (block) = 1;
1060 /* In each subblock, record that this is its superior. */
1061 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1062 BLOCK_SUPERCONTEXT (p) = block;
1064 BLOCK_VARS (block) = 0;
1067 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1068 scope must be set so that they point to the appropriate
1069 construct, i.e. either to the current FUNCTION_DECL node, or
1070 else to the BLOCK node we just constructed.
1072 Note that for tagged types whose scope is just the formal
1073 parameter list for some function type specification, we can't
1074 properly set their TYPE_CONTEXTs here, because we don't have a
1075 pointer to the appropriate FUNCTION_TYPE node readily available
1076 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1077 type nodes get set in `grokdeclarator' as soon as we have created
1078 the FUNCTION_TYPE node which will represent the "scope" for these
1079 "parameter list local" tagged types. */
1080 if (scope->function_body)
1081 context = current_function_decl;
1082 else if (scope == file_scope)
1084 tree file_decl = build_translation_unit_decl (NULL_TREE);
1085 context = file_decl;
1090 /* Clear all bindings in this scope. */
1091 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1094 switch (TREE_CODE (p))
1097 /* Warnings for unused labels, errors for undefined labels. */
1098 if (TREE_USED (p) && !DECL_INITIAL (p))
1100 error ("label %q+D used but not defined", p);
1101 DECL_INITIAL (p) = error_mark_node;
1104 warn_for_unused_label (p);
1106 /* Labels go in BLOCK_VARS. */
1107 DECL_CHAIN (p) = BLOCK_VARS (block);
1108 BLOCK_VARS (block) = p;
1109 gcc_assert (I_LABEL_BINDING (b->id) == b);
1110 I_LABEL_BINDING (b->id) = b->shadowed;
1112 /* Also pop back to the shadowed label_vars. */
1113 release_tree_vector (b->u.label->decls_in_scope);
1114 b->u.label = b->u.label->shadowed;
1120 set_type_context (p, context);
1122 /* Types may not have tag-names, in which case the type
1123 appears in the bindings list with b->id NULL. */
1126 gcc_assert (I_TAG_BINDING (b->id) == b);
1127 I_TAG_BINDING (b->id) = b->shadowed;
1132 /* Propagate TREE_ADDRESSABLE from nested functions to their
1133 containing functions. */
1134 if (!TREE_ASM_WRITTEN (p)
1135 && DECL_INITIAL (p) != 0
1136 && TREE_ADDRESSABLE (p)
1137 && DECL_ABSTRACT_ORIGIN (p) != 0
1138 && DECL_ABSTRACT_ORIGIN (p) != p)
1139 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1140 if (!DECL_EXTERNAL (p)
1141 && !DECL_INITIAL (p)
1142 && scope != file_scope
1143 && scope != external_scope)
1145 error ("nested function %q+D declared but never defined", p);
1146 undef_nested_function = true;
1148 else if (DECL_DECLARED_INLINE_P (p)
1150 && !DECL_INITIAL (p))
1152 /* C99 6.7.4p6: "a function with external linkage... declared
1153 with an inline function specifier ... shall also be defined
1154 in the same translation unit." */
1155 if (!flag_gnu89_inline)
1156 pedwarn (input_location, 0,
1157 "inline function %q+D declared but never defined", p);
1158 DECL_EXTERNAL (p) = 1;
1164 /* Warnings for unused variables. */
1165 if ((!TREE_USED (p) || !DECL_READ_P (p))
1166 && !TREE_NO_WARNING (p)
1167 && !DECL_IN_SYSTEM_HEADER (p)
1169 && !DECL_ARTIFICIAL (p)
1170 && scope != file_scope
1171 && scope != external_scope)
1174 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1175 else if (DECL_CONTEXT (p) == current_function_decl)
1176 warning_at (DECL_SOURCE_LOCATION (p),
1177 OPT_Wunused_but_set_variable,
1178 "variable %qD set but not used", p);
1183 error ("type of array %q+D completed incompatibly with"
1184 " implicit initialization", p);
1191 /* All of these go in BLOCK_VARS, but only if this is the
1192 binding in the home scope. */
1195 DECL_CHAIN (p) = BLOCK_VARS (block);
1196 BLOCK_VARS (block) = p;
1198 else if (VAR_OR_FUNCTION_DECL_P (p) && scope != file_scope)
1200 /* For block local externs add a special
1201 DECL_EXTERNAL decl for debug info generation. */
1202 tree extp = copy_node (p);
1204 DECL_EXTERNAL (extp) = 1;
1205 TREE_STATIC (extp) = 0;
1206 TREE_PUBLIC (extp) = 1;
1207 DECL_INITIAL (extp) = NULL_TREE;
1208 DECL_LANG_SPECIFIC (extp) = NULL;
1209 DECL_CONTEXT (extp) = current_function_decl;
1210 if (TREE_CODE (p) == FUNCTION_DECL)
1212 DECL_RESULT (extp) = NULL_TREE;
1213 DECL_SAVED_TREE (extp) = NULL_TREE;
1214 DECL_STRUCT_FUNCTION (extp) = NULL;
1216 if (b->locus != UNKNOWN_LOCATION)
1217 DECL_SOURCE_LOCATION (extp) = b->locus;
1218 DECL_CHAIN (extp) = BLOCK_VARS (block);
1219 BLOCK_VARS (block) = extp;
1221 /* If this is the file scope set DECL_CONTEXT of each decl to
1222 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1224 if (scope == file_scope)
1226 DECL_CONTEXT (p) = context;
1227 if (TREE_CODE (p) == TYPE_DECL
1228 && TREE_TYPE (p) != error_mark_node)
1229 set_type_context (TREE_TYPE (p), context);
1233 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1234 already been put there by store_parm_decls. Unused-
1235 parameter warnings are handled by function.c.
1236 error_mark_node obviously does not go in BLOCK_VARS and
1237 does not get unused-variable warnings. */
1240 /* It is possible for a decl not to have a name. We get
1241 here with b->id NULL in this case. */
1244 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1245 I_SYMBOL_BINDING (b->id) = b->shadowed;
1246 if (b->shadowed && b->shadowed->u.type)
1247 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1257 /* Dispose of the block that we just made inside some higher level. */
1258 if ((scope->function_body || scope == file_scope) && context)
1260 DECL_INITIAL (context) = block;
1261 BLOCK_SUPERCONTEXT (block) = context;
1263 else if (scope->outer)
1266 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1267 /* If we did not make a block for the scope just exited, any
1268 blocks made for inner scopes must be carried forward so they
1269 will later become subblocks of something else. */
1270 else if (scope->blocks)
1271 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1274 /* Pop the current scope, and free the structure for reuse. */
1275 current_scope = scope->outer;
1276 if (scope->function_body)
1277 current_function_scope = scope->outer_function;
1279 memset (scope, 0, sizeof (struct c_scope));
1280 scope->outer = scope_freelist;
1281 scope_freelist = scope;
1287 push_file_scope (void)
1295 file_scope = current_scope;
1297 start_fname_decls ();
1299 for (decl = visible_builtins; decl; decl = DECL_CHAIN (decl))
1300 bind (DECL_NAME (decl), decl, file_scope,
1301 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1305 pop_file_scope (void)
1307 /* In case there were missing closebraces, get us back to the global
1309 while (current_scope != file_scope)
1312 /* __FUNCTION__ is defined at file scope (""). This
1313 call may not be necessary as my tests indicate it
1314 still works without it. */
1315 finish_fname_decls ();
1317 check_inline_statics ();
1319 /* This is the point to write out a PCH if we're doing that.
1320 In that case we do not want to do anything else. */
1323 c_common_write_pch ();
1327 /* Pop off the file scope and close this translation unit. */
1331 maybe_apply_pending_pragma_weaks ();
1334 /* Adjust the bindings for the start of a statement expression. */
1337 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1339 struct c_scope *scope;
1341 for (scope = current_scope; scope != NULL; scope = scope->outer)
1343 struct c_binding *b;
1345 if (!scope->has_label_bindings)
1348 for (b = scope->bindings; b != NULL; b = b->prev)
1350 struct c_label_vars *label_vars;
1352 struct c_goto_bindings *g;
1354 if (TREE_CODE (b->decl) != LABEL_DECL)
1356 label_vars = b->u.label;
1357 ++label_vars->label_bindings.stmt_exprs;
1358 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
1359 ++g->goto_bindings.stmt_exprs;
1363 if (switch_bindings != NULL)
1364 ++switch_bindings->stmt_exprs;
1367 /* Adjust the bindings for the end of a statement expression. */
1370 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1372 struct c_scope *scope;
1374 for (scope = current_scope; scope != NULL; scope = scope->outer)
1376 struct c_binding *b;
1378 if (!scope->has_label_bindings)
1381 for (b = scope->bindings; b != NULL; b = b->prev)
1383 struct c_label_vars *label_vars;
1385 struct c_goto_bindings *g;
1387 if (TREE_CODE (b->decl) != LABEL_DECL)
1389 label_vars = b->u.label;
1390 --label_vars->label_bindings.stmt_exprs;
1391 if (label_vars->label_bindings.stmt_exprs < 0)
1393 label_vars->label_bindings.left_stmt_expr = true;
1394 label_vars->label_bindings.stmt_exprs = 0;
1396 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
1398 --g->goto_bindings.stmt_exprs;
1399 if (g->goto_bindings.stmt_exprs < 0)
1401 g->goto_bindings.left_stmt_expr = true;
1402 g->goto_bindings.stmt_exprs = 0;
1408 if (switch_bindings != NULL)
1410 --switch_bindings->stmt_exprs;
1411 gcc_assert (switch_bindings->stmt_exprs >= 0);
1415 /* Push a definition or a declaration of struct, union or enum tag "name".
1416 "type" should be the type node.
1417 We assume that the tag "name" is not already defined, and has a location
1420 Note that the definition may really be just a forward reference.
1421 In that case, the TYPE_SIZE will be zero. */
1424 pushtag (location_t loc, tree name, tree type)
1426 /* Record the identifier as the type's name if it has none. */
1427 if (name && !TYPE_NAME (type))
1428 TYPE_NAME (type) = name;
1429 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false, loc);
1431 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1432 tagged type we just added to the current scope. This fake
1433 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1434 to output a representation of a tagged type, and it also gives
1435 us a convenient place to record the "scope start" address for the
1438 TYPE_STUB_DECL (type) = pushdecl (build_decl (loc,
1439 TYPE_DECL, NULL_TREE, type));
1441 /* An approximation for now, so we can tell this is a function-scope tag.
1442 This will be updated in pop_scope. */
1443 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1445 if (warn_cxx_compat && name != NULL_TREE)
1447 struct c_binding *b = I_SYMBOL_BINDING (name);
1450 && b->decl != NULL_TREE
1451 && TREE_CODE (b->decl) == TYPE_DECL
1452 && (B_IN_CURRENT_SCOPE (b)
1453 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
1454 && (TYPE_MAIN_VARIANT (TREE_TYPE (b->decl))
1455 != TYPE_MAIN_VARIANT (type)))
1457 warning_at (loc, OPT_Wc___compat,
1458 ("using %qD as both a typedef and a tag is "
1461 if (b->locus != UNKNOWN_LOCATION)
1462 inform (b->locus, "originally defined here");
1467 /* Subroutine of compare_decls. Allow harmless mismatches in return
1468 and argument types provided that the type modes match. This function
1469 return a unified type given a suitable match, and 0 otherwise. */
1472 match_builtin_function_types (tree newtype, tree oldtype)
1474 tree newrettype, oldrettype;
1475 tree newargs, oldargs;
1476 tree trytype, tryargs;
1478 /* Accept the return type of the new declaration if same modes. */
1479 oldrettype = TREE_TYPE (oldtype);
1480 newrettype = TREE_TYPE (newtype);
1482 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1485 oldargs = TYPE_ARG_TYPES (oldtype);
1486 newargs = TYPE_ARG_TYPES (newtype);
1489 while (oldargs || newargs)
1493 || !TREE_VALUE (oldargs)
1494 || !TREE_VALUE (newargs)
1495 || TYPE_MODE (TREE_VALUE (oldargs))
1496 != TYPE_MODE (TREE_VALUE (newargs)))
1499 oldargs = TREE_CHAIN (oldargs);
1500 newargs = TREE_CHAIN (newargs);
1503 trytype = build_function_type (newrettype, tryargs);
1504 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1507 /* Subroutine of diagnose_mismatched_decls. Check for function type
1508 mismatch involving an empty arglist vs a nonempty one and give clearer
1511 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1512 tree newtype, tree oldtype)
1516 if (TREE_CODE (olddecl) != FUNCTION_DECL
1517 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1518 || !((!prototype_p (oldtype) && DECL_INITIAL (olddecl) == 0)
1519 || (!prototype_p (newtype) && DECL_INITIAL (newdecl) == 0)))
1522 t = TYPE_ARG_TYPES (oldtype);
1524 t = TYPE_ARG_TYPES (newtype);
1525 for (; t; t = TREE_CHAIN (t))
1527 tree type = TREE_VALUE (t);
1529 if (TREE_CHAIN (t) == 0
1530 && TYPE_MAIN_VARIANT (type) != void_type_node)
1532 inform (input_location, "a parameter list with an ellipsis can%'t match "
1533 "an empty parameter name list declaration");
1537 if (c_type_promotes_to (type) != type)
1539 inform (input_location, "an argument type that has a default promotion can%'t match "
1540 "an empty parameter name list declaration");
1546 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1547 old-style function definition, NEWDECL is a prototype declaration.
1548 Diagnose inconsistencies in the argument list. Returns TRUE if
1549 the prototype is compatible, FALSE if not. */
1551 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1553 tree newargs, oldargs;
1556 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1558 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1559 newargs = TYPE_ARG_TYPES (newtype);
1564 tree oldargtype = TREE_VALUE (oldargs);
1565 tree newargtype = TREE_VALUE (newargs);
1567 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1570 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1571 newargtype = TYPE_MAIN_VARIANT (newargtype);
1573 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1576 /* Reaching the end of just one list means the two decls don't
1577 agree on the number of arguments. */
1578 if (END_OF_ARGLIST (oldargtype))
1580 error ("prototype for %q+D declares more arguments "
1581 "than previous old-style definition", newdecl);
1584 else if (END_OF_ARGLIST (newargtype))
1586 error ("prototype for %q+D declares fewer arguments "
1587 "than previous old-style definition", newdecl);
1591 /* Type for passing arg must be consistent with that declared
1593 else if (!comptypes (oldargtype, newargtype))
1595 error ("prototype for %q+D declares argument %d"
1596 " with incompatible type",
1601 oldargs = TREE_CHAIN (oldargs);
1602 newargs = TREE_CHAIN (newargs);
1606 /* If we get here, no errors were found, but do issue a warning
1607 for this poor-style construct. */
1608 warning (0, "prototype for %q+D follows non-prototype definition",
1611 #undef END_OF_ARGLIST
1614 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1615 first in a pair of mismatched declarations, using the diagnostic
1618 locate_old_decl (tree decl)
1620 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1622 else if (DECL_INITIAL (decl))
1623 inform (input_location, "previous definition of %q+D was here", decl);
1624 else if (C_DECL_IMPLICIT (decl))
1625 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1627 inform (input_location, "previous declaration of %q+D was here", decl);
1630 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1631 Returns true if the caller should proceed to merge the two, false
1632 if OLDDECL should simply be discarded. As a side effect, issues
1633 all necessary diagnostics for invalid or poor-style combinations.
1634 If it returns true, writes the types of NEWDECL and OLDDECL to
1635 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1636 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1639 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1640 tree *newtypep, tree *oldtypep)
1642 tree newtype, oldtype;
1643 bool pedwarned = false;
1644 bool warned = false;
1647 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1648 && DECL_EXTERNAL (DECL))
1650 /* If we have error_mark_node for either decl or type, just discard
1651 the previous decl - we're in an error cascade already. */
1652 if (olddecl == error_mark_node || newdecl == error_mark_node)
1654 *oldtypep = oldtype = TREE_TYPE (olddecl);
1655 *newtypep = newtype = TREE_TYPE (newdecl);
1656 if (oldtype == error_mark_node || newtype == error_mark_node)
1659 /* Two different categories of symbol altogether. This is an error
1660 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1661 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1663 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1664 && DECL_BUILT_IN (olddecl)
1665 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1667 error ("%q+D redeclared as different kind of symbol", newdecl);
1668 locate_old_decl (olddecl);
1670 else if (TREE_PUBLIC (newdecl))
1671 warning (0, "built-in function %q+D declared as non-function",
1674 warning (OPT_Wshadow, "declaration of %q+D shadows "
1675 "a built-in function", newdecl);
1679 /* Enumerators have no linkage, so may only be declared once in a
1681 if (TREE_CODE (olddecl) == CONST_DECL)
1683 error ("redeclaration of enumerator %q+D", newdecl);
1684 locate_old_decl (olddecl);
1688 if (!comptypes (oldtype, newtype))
1690 if (TREE_CODE (olddecl) == FUNCTION_DECL
1691 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1693 /* Accept harmless mismatch in function types.
1694 This is for the ffs and fprintf builtins. */
1695 tree trytype = match_builtin_function_types (newtype, oldtype);
1697 if (trytype && comptypes (newtype, trytype))
1698 *oldtypep = oldtype = trytype;
1701 /* If types don't match for a built-in, throw away the
1702 built-in. No point in calling locate_old_decl here, it
1703 won't print anything. */
1704 warning (0, "conflicting types for built-in function %q+D",
1709 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1710 && DECL_IS_BUILTIN (olddecl))
1712 /* A conflicting function declaration for a predeclared
1713 function that isn't actually built in. Objective C uses
1714 these. The new declaration silently overrides everything
1715 but the volatility (i.e. noreturn) indication. See also
1716 below. FIXME: Make Objective C use normal builtins. */
1717 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1720 /* Permit void foo (...) to match int foo (...) if the latter is
1721 the definition and implicit int was used. See
1722 c-torture/compile/920625-2.c. */
1723 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1724 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1725 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1726 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1728 pedwarned = pedwarn (input_location, 0,
1729 "conflicting types for %q+D", newdecl);
1730 /* Make sure we keep void as the return type. */
1731 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1732 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1734 /* Permit void foo (...) to match an earlier call to foo (...) with
1735 no declared type (thus, implicitly int). */
1736 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1737 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1738 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1739 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1741 pedwarned = pedwarn (input_location, 0,
1742 "conflicting types for %q+D", newdecl);
1743 /* Make sure we keep void as the return type. */
1744 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1748 int new_quals = TYPE_QUALS (newtype);
1749 int old_quals = TYPE_QUALS (oldtype);
1751 if (new_quals != old_quals)
1753 addr_space_t new_addr = DECODE_QUAL_ADDR_SPACE (new_quals);
1754 addr_space_t old_addr = DECODE_QUAL_ADDR_SPACE (old_quals);
1755 if (new_addr != old_addr)
1757 if (ADDR_SPACE_GENERIC_P (new_addr))
1758 error ("conflicting named address spaces (generic vs %s) "
1760 c_addr_space_name (old_addr), newdecl);
1761 else if (ADDR_SPACE_GENERIC_P (old_addr))
1762 error ("conflicting named address spaces (%s vs generic) "
1764 c_addr_space_name (new_addr), newdecl);
1766 error ("conflicting named address spaces (%s vs %s) "
1768 c_addr_space_name (new_addr),
1769 c_addr_space_name (old_addr),
1773 if (CLEAR_QUAL_ADDR_SPACE (new_quals)
1774 != CLEAR_QUAL_ADDR_SPACE (old_quals))
1775 error ("conflicting type qualifiers for %q+D", newdecl);
1778 error ("conflicting types for %q+D", newdecl);
1779 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1780 locate_old_decl (olddecl);
1785 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1786 but silently ignore the redeclaration if either is in a system
1787 header. (Conflicting redeclarations were handled above.) This
1788 is allowed for C11 if the types are the same, not just
1790 if (TREE_CODE (newdecl) == TYPE_DECL)
1792 bool types_different = false;
1793 int comptypes_result;
1796 = comptypes_check_different_types (oldtype, newtype, &types_different);
1798 if (comptypes_result != 1 || types_different)
1800 error ("redefinition of typedef %q+D with different type", newdecl);
1801 locate_old_decl (olddecl);
1805 if (DECL_IN_SYSTEM_HEADER (newdecl)
1806 || DECL_IN_SYSTEM_HEADER (olddecl)
1807 || TREE_NO_WARNING (newdecl)
1808 || TREE_NO_WARNING (olddecl))
1809 return true; /* Allow OLDDECL to continue in use. */
1811 if (variably_modified_type_p (newtype, NULL))
1813 error ("redefinition of typedef %q+D with variably modified type",
1815 locate_old_decl (olddecl);
1817 else if (pedantic && !flag_isoc11)
1819 pedwarn (input_location, OPT_pedantic,
1820 "redefinition of typedef %q+D", newdecl);
1821 locate_old_decl (olddecl);
1827 /* Function declarations can either be 'static' or 'extern' (no
1828 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1829 can never conflict with each other on account of linkage
1830 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1831 gnu89 mode permits two definitions if one is 'extern inline' and
1832 one is not. The non- extern-inline definition supersedes the
1833 extern-inline definition. */
1835 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1837 /* If you declare a built-in function name as static, or
1838 define the built-in with an old-style definition (so we
1839 can't validate the argument list) the built-in definition is
1840 overridden, but optionally warn this was a bad choice of name. */
1841 if (DECL_BUILT_IN (olddecl)
1842 && !C_DECL_DECLARED_BUILTIN (olddecl)
1843 && (!TREE_PUBLIC (newdecl)
1844 || (DECL_INITIAL (newdecl)
1845 && !prototype_p (TREE_TYPE (newdecl)))))
1847 warning (OPT_Wshadow, "declaration of %q+D shadows "
1848 "a built-in function", newdecl);
1849 /* Discard the old built-in function. */
1853 if (DECL_INITIAL (newdecl))
1855 if (DECL_INITIAL (olddecl))
1857 /* If both decls are in the same TU and the new declaration
1858 isn't overriding an extern inline reject the new decl.
1859 In c99, no overriding is allowed in the same translation
1861 if ((!DECL_EXTERN_INLINE (olddecl)
1862 || DECL_EXTERN_INLINE (newdecl)
1863 || (!flag_gnu89_inline
1864 && (!DECL_DECLARED_INLINE_P (olddecl)
1865 || !lookup_attribute ("gnu_inline",
1866 DECL_ATTRIBUTES (olddecl)))
1867 && (!DECL_DECLARED_INLINE_P (newdecl)
1868 || !lookup_attribute ("gnu_inline",
1869 DECL_ATTRIBUTES (newdecl))))
1871 && same_translation_unit_p (newdecl, olddecl))
1873 error ("redefinition of %q+D", newdecl);
1874 locate_old_decl (olddecl);
1879 /* If we have a prototype after an old-style function definition,
1880 the argument types must be checked specially. */
1881 else if (DECL_INITIAL (olddecl)
1882 && !prototype_p (oldtype) && prototype_p (newtype)
1883 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1884 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1886 locate_old_decl (olddecl);
1889 /* A non-static declaration (even an "extern") followed by a
1890 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1891 The same is true for a static forward declaration at block
1892 scope followed by a non-static declaration/definition at file
1893 scope. Static followed by non-static at the same scope is
1894 not undefined behavior, and is the most convenient way to get
1895 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1896 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1897 we do diagnose it if -Wtraditional. */
1898 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1900 /* Two exceptions to the rule. If olddecl is an extern
1901 inline, or a predeclared function that isn't actually
1902 built in, newdecl silently overrides olddecl. The latter
1903 occur only in Objective C; see also above. (FIXME: Make
1904 Objective C use normal builtins.) */
1905 if (!DECL_IS_BUILTIN (olddecl)
1906 && !DECL_EXTERN_INLINE (olddecl))
1908 error ("static declaration of %q+D follows "
1909 "non-static declaration", newdecl);
1910 locate_old_decl (olddecl);
1914 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1916 if (DECL_CONTEXT (olddecl))
1918 error ("non-static declaration of %q+D follows "
1919 "static declaration", newdecl);
1920 locate_old_decl (olddecl);
1923 else if (warn_traditional)
1925 warned |= warning (OPT_Wtraditional,
1926 "non-static declaration of %q+D "
1927 "follows static declaration", newdecl);
1931 /* Make sure gnu_inline attribute is either not present, or
1932 present on all inline decls. */
1933 if (DECL_DECLARED_INLINE_P (olddecl)
1934 && DECL_DECLARED_INLINE_P (newdecl))
1936 bool newa = lookup_attribute ("gnu_inline",
1937 DECL_ATTRIBUTES (newdecl)) != NULL;
1938 bool olda = lookup_attribute ("gnu_inline",
1939 DECL_ATTRIBUTES (olddecl)) != NULL;
1942 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
1943 newa ? newdecl : olddecl);
1944 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
1949 else if (TREE_CODE (newdecl) == VAR_DECL)
1951 /* Only variables can be thread-local, and all declarations must
1952 agree on this property. */
1953 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1955 /* Nothing to check. Since OLDDECL is marked threadprivate
1956 and NEWDECL does not have a thread-local attribute, we
1957 will merge the threadprivate attribute into NEWDECL. */
1960 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1962 if (DECL_THREAD_LOCAL_P (newdecl))
1963 error ("thread-local declaration of %q+D follows "
1964 "non-thread-local declaration", newdecl);
1966 error ("non-thread-local declaration of %q+D follows "
1967 "thread-local declaration", newdecl);
1969 locate_old_decl (olddecl);
1973 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1974 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1976 error ("redefinition of %q+D", newdecl);
1977 locate_old_decl (olddecl);
1981 /* Objects declared at file scope: if the first declaration had
1982 external linkage (even if it was an external reference) the
1983 second must have external linkage as well, or the behavior is
1984 undefined. If the first declaration had internal linkage, then
1985 the second must too, or else be an external reference (in which
1986 case the composite declaration still has internal linkage).
1987 As for function declarations, we warn about the static-then-
1988 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1989 if (DECL_FILE_SCOPE_P (newdecl)
1990 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1992 if (DECL_EXTERNAL (newdecl))
1994 if (!DECL_FILE_SCOPE_P (olddecl))
1996 error ("extern declaration of %q+D follows "
1997 "declaration with no linkage", newdecl);
1998 locate_old_decl (olddecl);
2001 else if (warn_traditional)
2003 warned |= warning (OPT_Wtraditional,
2004 "non-static declaration of %q+D "
2005 "follows static declaration", newdecl);
2010 if (TREE_PUBLIC (newdecl))
2011 error ("non-static declaration of %q+D follows "
2012 "static declaration", newdecl);
2014 error ("static declaration of %q+D follows "
2015 "non-static declaration", newdecl);
2017 locate_old_decl (olddecl);
2021 /* Two objects with the same name declared at the same block
2022 scope must both be external references (6.7p3). */
2023 else if (!DECL_FILE_SCOPE_P (newdecl))
2025 if (DECL_EXTERNAL (newdecl))
2027 /* Extern with initializer at block scope, which will
2028 already have received an error. */
2030 else if (DECL_EXTERNAL (olddecl))
2032 error ("declaration of %q+D with no linkage follows "
2033 "extern declaration", newdecl);
2034 locate_old_decl (olddecl);
2038 error ("redeclaration of %q+D with no linkage", newdecl);
2039 locate_old_decl (olddecl);
2045 /* C++ does not permit a decl to appear multiple times at file
2048 && DECL_FILE_SCOPE_P (newdecl)
2049 && !DECL_EXTERNAL (newdecl)
2050 && !DECL_EXTERNAL (olddecl))
2051 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2053 ("duplicate declaration of %qD is "
2059 /* All decls must agree on a visibility. */
2060 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2061 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2062 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2064 warned |= warning (0, "redeclaration of %q+D with different visibility "
2065 "(old visibility preserved)", newdecl);
2068 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2070 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2071 if (DECL_DECLARED_INLINE_P (newdecl)
2072 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2074 warned |= warning (OPT_Wattributes,
2075 "inline declaration of %qD follows "
2076 "declaration with attribute noinline", newdecl);
2078 else if (DECL_DECLARED_INLINE_P (olddecl)
2079 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2081 warned |= warning (OPT_Wattributes,
2082 "declaration of %q+D with attribute "
2083 "noinline follows inline declaration ", newdecl);
2086 else /* PARM_DECL, VAR_DECL */
2088 /* Redeclaration of a parameter is a constraint violation (this is
2089 not explicitly stated, but follows from C99 6.7p3 [no more than
2090 one declaration of the same identifier with no linkage in the
2091 same scope, except type tags] and 6.2.2p6 [parameters have no
2092 linkage]). We must check for a forward parameter declaration,
2093 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2094 an extension, the mandatory diagnostic for which is handled by
2095 mark_forward_parm_decls. */
2097 if (TREE_CODE (newdecl) == PARM_DECL
2098 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2100 error ("redefinition of parameter %q+D", newdecl);
2101 locate_old_decl (olddecl);
2106 /* Optional warning for completely redundant decls. */
2107 if (!warned && !pedwarned
2108 && warn_redundant_decls
2109 /* Don't warn about a function declaration followed by a
2111 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2112 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2113 /* Don't warn about redundant redeclarations of builtins. */
2114 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2115 && !DECL_BUILT_IN (newdecl)
2116 && DECL_BUILT_IN (olddecl)
2117 && !C_DECL_DECLARED_BUILTIN (olddecl))
2118 /* Don't warn about an extern followed by a definition. */
2119 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2120 /* Don't warn about forward parameter decls. */
2121 && !(TREE_CODE (newdecl) == PARM_DECL
2122 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2123 /* Don't warn about a variable definition following a declaration. */
2124 && !(TREE_CODE (newdecl) == VAR_DECL
2125 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2127 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2131 /* Report location of previous decl/defn. */
2132 if (warned || pedwarned)
2133 locate_old_decl (olddecl);
2135 #undef DECL_EXTERN_INLINE
2140 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2141 consistent with OLDDECL, but carries new information. Merge the
2142 new information into OLDDECL. This function issues no
2146 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2148 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2149 && DECL_INITIAL (newdecl) != 0);
2150 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2151 && prototype_p (TREE_TYPE (newdecl)));
2152 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2153 && prototype_p (TREE_TYPE (olddecl)));
2154 bool extern_changed = false;
2156 /* For real parm decl following a forward decl, rechain the old decl
2157 in its new location and clear TREE_ASM_WRITTEN (it's not a
2158 forward decl anymore). */
2159 if (TREE_CODE (newdecl) == PARM_DECL
2160 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2162 struct c_binding *b, **here;
2164 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2165 if ((*here)->decl == olddecl)
2172 b->prev = current_scope->bindings;
2173 current_scope->bindings = b;
2175 TREE_ASM_WRITTEN (olddecl) = 0;
2178 DECL_ATTRIBUTES (newdecl)
2179 = targetm.merge_decl_attributes (olddecl, newdecl);
2181 /* Merge the data types specified in the two decls. */
2183 = TREE_TYPE (olddecl)
2184 = composite_type (newtype, oldtype);
2186 /* Lay the type out, unless already done. */
2187 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2189 if (TREE_TYPE (newdecl) != error_mark_node)
2190 layout_type (TREE_TYPE (newdecl));
2191 if (TREE_CODE (newdecl) != FUNCTION_DECL
2192 && TREE_CODE (newdecl) != TYPE_DECL
2193 && TREE_CODE (newdecl) != CONST_DECL)
2194 layout_decl (newdecl, 0);
2198 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2199 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2200 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2201 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2202 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2204 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2205 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2209 /* Keep the old rtl since we can safely use it. */
2210 if (HAS_RTL_P (olddecl))
2211 COPY_DECL_RTL (olddecl, newdecl);
2213 /* Merge the type qualifiers. */
2214 if (TREE_READONLY (newdecl))
2215 TREE_READONLY (olddecl) = 1;
2217 if (TREE_THIS_VOLATILE (newdecl))
2218 TREE_THIS_VOLATILE (olddecl) = 1;
2220 /* Merge deprecatedness. */
2221 if (TREE_DEPRECATED (newdecl))
2222 TREE_DEPRECATED (olddecl) = 1;
2224 /* If a decl is in a system header and the other isn't, keep the one on the
2225 system header. Otherwise, keep source location of definition rather than
2226 declaration and of prototype rather than non-prototype unless that
2227 prototype is built-in. */
2228 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2229 && DECL_IN_SYSTEM_HEADER (olddecl)
2230 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2231 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2232 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2233 && DECL_IN_SYSTEM_HEADER (newdecl)
2234 && !DECL_IN_SYSTEM_HEADER (olddecl))
2235 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2236 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2237 || (old_is_prototype && !new_is_prototype
2238 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2239 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2241 /* Merge the initialization information. */
2242 if (DECL_INITIAL (newdecl) == 0)
2243 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2245 /* Merge the threadprivate attribute. */
2246 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2248 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
2249 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2252 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2254 /* Merge the section attribute.
2255 We want to issue an error if the sections conflict but that
2256 must be done later in decl_attributes since we are called
2257 before attributes are assigned. */
2258 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2259 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2261 /* Copy the assembler name.
2262 Currently, it can only be defined in the prototype. */
2263 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2265 /* Use visibility of whichever declaration had it specified */
2266 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2268 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2269 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2272 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2274 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2275 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2276 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2277 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2278 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2279 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2280 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2281 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2282 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2283 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2284 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2287 /* Merge the storage class information. */
2288 merge_weak (newdecl, olddecl);
2290 /* For functions, static overrides non-static. */
2291 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2293 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2294 /* This is since we don't automatically
2295 copy the attributes of NEWDECL into OLDDECL. */
2296 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2297 /* If this clears `static', clear it in the identifier too. */
2298 if (!TREE_PUBLIC (olddecl))
2299 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2303 /* In c99, 'extern' declaration before (or after) 'inline' means this
2304 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2306 if (TREE_CODE (newdecl) == FUNCTION_DECL
2307 && !flag_gnu89_inline
2308 && (DECL_DECLARED_INLINE_P (newdecl)
2309 || DECL_DECLARED_INLINE_P (olddecl))
2310 && (!DECL_DECLARED_INLINE_P (newdecl)
2311 || !DECL_DECLARED_INLINE_P (olddecl)
2312 || !DECL_EXTERNAL (olddecl))
2313 && DECL_EXTERNAL (newdecl)
2314 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2315 && !current_function_decl)
2316 DECL_EXTERNAL (newdecl) = 0;
2318 if (DECL_EXTERNAL (newdecl))
2320 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2321 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2323 /* An extern decl does not override previous storage class. */
2324 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2325 if (!DECL_EXTERNAL (newdecl))
2327 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2328 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2333 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2334 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2337 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2339 /* If we're redefining a function previously defined as extern
2340 inline, make sure we emit debug info for the inline before we
2341 throw it away, in case it was inlined into a function that
2342 hasn't been written out yet. */
2343 if (new_is_definition && DECL_INITIAL (olddecl))
2344 /* The new defn must not be inline. */
2345 DECL_UNINLINABLE (newdecl) = 1;
2348 /* If either decl says `inline', this fn is inline, unless
2349 its definition was passed already. */
2350 if (DECL_DECLARED_INLINE_P (newdecl)
2351 || DECL_DECLARED_INLINE_P (olddecl))
2352 DECL_DECLARED_INLINE_P (newdecl) = 1;
2354 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2355 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2357 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2358 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2359 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2360 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2363 if (DECL_BUILT_IN (olddecl))
2365 /* If redeclaring a builtin function, it stays built in.
2366 But it gets tagged as having been declared. */
2367 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2368 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2369 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2370 if (new_is_prototype)
2372 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2373 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2375 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2378 /* If a compatible prototype of these builtin functions
2379 is seen, assume the runtime implements it with the
2380 expected semantics. */
2381 case BUILT_IN_STPCPY:
2382 if (builtin_decl_explicit_p (fncode))
2383 set_builtin_decl_implicit_p (fncode, true);
2391 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2392 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2395 /* Preserve function specific target and optimization options */
2396 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2397 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2398 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2399 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2401 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2402 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2403 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2404 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2406 /* Also preserve various other info from the definition. */
2407 if (!new_is_definition)
2410 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2411 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2412 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2413 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2414 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2415 for (t = DECL_ARGUMENTS (newdecl); t ; t = DECL_CHAIN (t))
2416 DECL_CONTEXT (t) = newdecl;
2418 /* See if we've got a function to instantiate from. */
2419 if (DECL_SAVED_TREE (olddecl))
2420 DECL_ABSTRACT_ORIGIN (newdecl)
2421 = DECL_ABSTRACT_ORIGIN (olddecl);
2425 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
2427 /* Merge the USED information. */
2428 if (TREE_USED (olddecl))
2429 TREE_USED (newdecl) = 1;
2430 else if (TREE_USED (newdecl))
2431 TREE_USED (olddecl) = 1;
2432 if (TREE_CODE (olddecl) == VAR_DECL || TREE_CODE (olddecl) == PARM_DECL)
2433 DECL_READ_P (newdecl) |= DECL_READ_P (olddecl);
2434 if (DECL_PRESERVE_P (olddecl))
2435 DECL_PRESERVE_P (newdecl) = 1;
2436 else if (DECL_PRESERVE_P (newdecl))
2437 DECL_PRESERVE_P (olddecl) = 1;
2439 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2440 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2441 DECL_ARGUMENTS (if appropriate). */
2443 unsigned olddecl_uid = DECL_UID (olddecl);
2444 tree olddecl_context = DECL_CONTEXT (olddecl);
2445 tree olddecl_arguments = NULL;
2446 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2447 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2449 memcpy ((char *) olddecl + sizeof (struct tree_common),
2450 (char *) newdecl + sizeof (struct tree_common),
2451 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2452 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2453 switch (TREE_CODE (olddecl))
2463 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2464 (char *) newdecl + sizeof (struct tree_decl_common),
2465 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2470 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2471 (char *) newdecl + sizeof (struct tree_decl_common),
2472 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2474 DECL_UID (olddecl) = olddecl_uid;
2475 DECL_CONTEXT (olddecl) = olddecl_context;
2476 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2477 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2480 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2481 so that encode_section_info has a chance to look at the new decl
2482 flags and attributes. */
2483 if (DECL_RTL_SET_P (olddecl)
2484 && (TREE_CODE (olddecl) == FUNCTION_DECL
2485 || (TREE_CODE (olddecl) == VAR_DECL
2486 && TREE_STATIC (olddecl))))
2487 make_decl_rtl (olddecl);
2489 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2490 and the definition is coming from the old version, cgraph needs
2491 to be called again. */
2492 if (extern_changed && !new_is_definition
2493 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
2494 cgraph_mark_if_needed (olddecl);
2497 /* Handle when a new declaration NEWDECL has the same name as an old
2498 one OLDDECL in the same binding contour. Prints an error message
2501 If safely possible, alter OLDDECL to look like NEWDECL, and return
2502 true. Otherwise, return false. */
2505 duplicate_decls (tree newdecl, tree olddecl)
2507 tree newtype = NULL, oldtype = NULL;
2509 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2511 /* Avoid `unused variable' and other warnings for OLDDECL. */
2512 TREE_NO_WARNING (olddecl) = 1;
2516 merge_decls (newdecl, olddecl, newtype, oldtype);
2521 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2523 warn_if_shadowing (tree new_decl)
2525 struct c_binding *b;
2527 /* Shadow warnings wanted? */
2529 /* No shadow warnings for internally generated vars. */
2530 || DECL_IS_BUILTIN (new_decl)
2531 /* No shadow warnings for vars made for inlining. */
2532 || DECL_FROM_INLINE (new_decl))
2535 /* Is anything being shadowed? Invisible decls do not count. */
2536 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2537 if (b->decl && b->decl != new_decl && !b->invisible
2538 && (b->decl == error_mark_node
2539 || diagnostic_report_warnings_p (global_dc,
2540 DECL_SOURCE_LOCATION (b->decl))))
2542 tree old_decl = b->decl;
2544 if (old_decl == error_mark_node)
2546 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2547 "non-variable", new_decl);
2550 else if (TREE_CODE (old_decl) == PARM_DECL)
2551 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
2553 else if (DECL_FILE_SCOPE_P (old_decl))
2554 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
2555 "declaration", new_decl);
2556 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2557 && DECL_BUILT_IN (old_decl))
2559 warning (OPT_Wshadow, "declaration of %q+D shadows "
2560 "a built-in function", new_decl);
2564 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2567 warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow,
2568 "shadowed declaration is here");
2574 /* Record a decl-node X as belonging to the current lexical scope.
2575 Check for errors (such as an incompatible declaration for the same
2576 name already seen in the same scope).
2578 Returns either X or an old decl for the same name.
2579 If an old decl is returned, it may have been smashed
2580 to agree with what X says. */
2585 tree name = DECL_NAME (x);
2586 struct c_scope *scope = current_scope;
2587 struct c_binding *b;
2588 bool nested = false;
2589 location_t locus = DECL_SOURCE_LOCATION (x);
2591 /* Must set DECL_CONTEXT for everything not at file scope or
2592 DECL_FILE_SCOPE_P won't work. Local externs don't count
2593 unless they have initializers (which generate code). */
2594 if (current_function_decl
2595 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2596 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2597 DECL_CONTEXT (x) = current_function_decl;
2599 /* Anonymous decls are just inserted in the scope. */
2602 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2607 /* First, see if there is another declaration with the same name in
2608 the current scope. If there is, duplicate_decls may do all the
2609 work for us. If duplicate_decls returns false, that indicates
2610 two incompatible decls in the same scope; we are to silently
2611 replace the old one (duplicate_decls has issued all appropriate
2612 diagnostics). In particular, we should not consider possible
2613 duplicates in the external scope, or shadowing. */
2614 b = I_SYMBOL_BINDING (name);
2615 if (b && B_IN_SCOPE (b, scope))
2617 struct c_binding *b_ext, *b_use;
2618 tree type = TREE_TYPE (x);
2619 tree visdecl = b->decl;
2620 tree vistype = TREE_TYPE (visdecl);
2621 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2622 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2623 b->inner_comp = false;
2626 /* If this is an external linkage declaration, we should check
2627 for compatibility with the type in the external scope before
2628 setting the type at this scope based on the visible
2629 information only. */
2630 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2632 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2633 b_ext = b_ext->shadowed;
2638 TREE_TYPE (b_use->decl) = b_use->u.type;
2641 if (duplicate_decls (x, b_use->decl))
2645 /* Save the updated type in the external scope and
2646 restore the proper type for this scope. */
2648 if (comptypes (vistype, type))
2649 thistype = composite_type (vistype, type);
2651 thistype = TREE_TYPE (b_use->decl);
2652 b_use->u.type = TREE_TYPE (b_use->decl);
2653 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2654 && DECL_BUILT_IN (b_use->decl))
2656 = build_type_attribute_variant (thistype,
2659 TREE_TYPE (b_use->decl) = thistype;
2664 goto skip_external_and_shadow_checks;
2667 /* All declarations with external linkage, and all external
2668 references, go in the external scope, no matter what scope is
2669 current. However, the binding in that scope is ignored for
2670 purposes of normal name lookup. A separate binding structure is
2671 created in the requested scope; this governs the normal
2672 visibility of the symbol.
2674 The binding in the externals scope is used exclusively for
2675 detecting duplicate declarations of the same object, no matter
2676 what scope they are in; this is what we do here. (C99 6.2.7p2:
2677 All declarations that refer to the same object or function shall
2678 have compatible type; otherwise, the behavior is undefined.) */
2679 if (DECL_EXTERNAL (x) || scope == file_scope)
2681 tree type = TREE_TYPE (x);
2684 bool type_saved = false;
2685 if (b && !B_IN_EXTERNAL_SCOPE (b)
2686 && (TREE_CODE (b->decl) == FUNCTION_DECL
2687 || TREE_CODE (b->decl) == VAR_DECL)
2688 && DECL_FILE_SCOPE_P (b->decl))
2691 vistype = TREE_TYPE (visdecl);
2693 if (scope != file_scope
2694 && !DECL_IN_SYSTEM_HEADER (x))
2695 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2697 while (b && !B_IN_EXTERNAL_SCOPE (b))
2699 /* If this decl might be modified, save its type. This is
2700 done here rather than when the decl is first bound
2701 because the type may change after first binding, through
2702 being completed or through attributes being added. If we
2703 encounter multiple such decls, only the first should have
2704 its type saved; the others will already have had their
2705 proper types saved and the types will not have changed as
2706 their scopes will not have been re-entered. */
2707 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2709 b->u.type = TREE_TYPE (b->decl);
2712 if (B_IN_FILE_SCOPE (b)
2713 && TREE_CODE (b->decl) == VAR_DECL
2714 && TREE_STATIC (b->decl)
2715 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2716 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2717 && TREE_CODE (type) == ARRAY_TYPE
2718 && TYPE_DOMAIN (type)
2719 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2720 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2722 /* Array type completed in inner scope, which should be
2723 diagnosed if the completion does not have size 1 and
2724 it does not get completed in the file scope. */
2725 b->inner_comp = true;
2730 /* If a matching external declaration has been found, set its
2731 type to the composite of all the types of that declaration.
2732 After the consistency checks, it will be reset to the
2733 composite of the visible types only. */
2734 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2736 TREE_TYPE (b->decl) = b->u.type;
2738 /* The point of the same_translation_unit_p check here is,
2739 we want to detect a duplicate decl for a construct like
2740 foo() { extern bar(); } ... static bar(); but not if
2741 they are in different translation units. In any case,
2742 the static does not go in the externals scope. */
2744 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2745 && duplicate_decls (x, b->decl))
2750 if (comptypes (vistype, type))
2751 thistype = composite_type (vistype, type);
2753 thistype = TREE_TYPE (b->decl);
2757 b->u.type = TREE_TYPE (b->decl);
2758 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2760 = build_type_attribute_variant (thistype,
2761 TYPE_ATTRIBUTES (b->u.type));
2762 TREE_TYPE (b->decl) = thistype;
2763 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2767 else if (TREE_PUBLIC (x))
2769 if (visdecl && !b && duplicate_decls (x, visdecl))
2771 /* An external declaration at block scope referring to a
2772 visible entity with internal linkage. The composite
2773 type will already be correct for this scope, so we
2774 just need to fall through to make the declaration in
2781 bind (name, x, external_scope, /*invisible=*/true,
2782 /*nested=*/false, locus);
2788 if (TREE_CODE (x) != PARM_DECL)
2789 warn_if_shadowing (x);
2791 skip_external_and_shadow_checks:
2792 if (TREE_CODE (x) == TYPE_DECL)
2794 /* So this is a typedef, set its underlying type. */
2795 set_underlying_type (x);
2797 /* If X is a typedef defined in the current function, record it
2798 for the purpose of implementing the -Wunused-local-typedefs
2800 record_locally_defined_typedef (x);
2803 bind (name, x, scope, /*invisible=*/false, nested, locus);
2805 /* If x's type is incomplete because it's based on a
2806 structure or union which has not yet been fully declared,
2807 attach it to that structure or union type, so we can go
2808 back and complete the variable declaration later, if the
2809 structure or union gets fully declared.
2811 If the input is erroneous, we can have error_mark in the type
2812 slot (e.g. "f(void a, ...)") - that doesn't count as an
2814 if (TREE_TYPE (x) != error_mark_node
2815 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2817 tree element = TREE_TYPE (x);
2819 while (TREE_CODE (element) == ARRAY_TYPE)
2820 element = TREE_TYPE (element);
2821 element = TYPE_MAIN_VARIANT (element);
2823 if ((TREE_CODE (element) == RECORD_TYPE
2824 || TREE_CODE (element) == UNION_TYPE)
2825 && (TREE_CODE (x) != TYPE_DECL
2826 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2827 && !COMPLETE_TYPE_P (element))
2828 C_TYPE_INCOMPLETE_VARS (element)
2829 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2834 /* Record X as belonging to file scope.
2835 This is used only internally by the Objective-C front end,
2836 and is limited to its needs. duplicate_decls is not called;
2837 if there is any preexisting decl for this identifier, it is an ICE. */
2840 pushdecl_top_level (tree x)
2843 bool nested = false;
2844 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2846 name = DECL_NAME (x);
2848 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2850 if (TREE_PUBLIC (x))
2852 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2857 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2863 implicit_decl_warning (tree id, tree olddecl)
2865 if (warn_implicit_function_declaration)
2870 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2871 "implicit declaration of function %qE", id);
2873 warned = warning (OPT_Wimplicit_function_declaration,
2874 G_("implicit declaration of function %qE"), id);
2875 if (olddecl && warned)
2876 locate_old_decl (olddecl);
2880 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2881 function of type int (). */
2884 implicitly_declare (location_t loc, tree functionid)
2886 struct c_binding *b;
2890 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2892 if (B_IN_SCOPE (b, external_scope))
2901 if (decl == error_mark_node)
2904 /* FIXME: Objective-C has weird not-really-builtin functions
2905 which are supposed to be visible automatically. They wind up
2906 in the external scope because they're pushed before the file
2907 scope gets created. Catch this here and rebind them into the
2909 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2911 bind (functionid, decl, file_scope,
2912 /*invisible=*/false, /*nested=*/true,
2913 DECL_SOURCE_LOCATION (decl));
2918 tree newtype = default_function_type;
2920 TREE_TYPE (decl) = b->u.type;
2921 /* Implicit declaration of a function already declared
2922 (somehow) in a different scope, or as a built-in.
2923 If this is the first time this has happened, warn;
2924 then recycle the old declaration but with the new type. */
2925 if (!C_DECL_IMPLICIT (decl))
2927 implicit_decl_warning (functionid, decl);
2928 C_DECL_IMPLICIT (decl) = 1;
2930 if (DECL_BUILT_IN (decl))
2932 newtype = build_type_attribute_variant (newtype,
2934 (TREE_TYPE (decl)));
2935 if (!comptypes (newtype, TREE_TYPE (decl)))
2937 warning_at (loc, 0, "incompatible implicit declaration of "
2938 "built-in function %qD", decl);
2939 newtype = TREE_TYPE (decl);
2944 if (!comptypes (newtype, TREE_TYPE (decl)))
2946 error_at (loc, "incompatible implicit declaration of function %qD", decl);
2947 locate_old_decl (decl);
2950 b->u.type = TREE_TYPE (decl);
2951 TREE_TYPE (decl) = newtype;
2952 bind (functionid, decl, current_scope,
2953 /*invisible=*/false, /*nested=*/true,
2954 DECL_SOURCE_LOCATION (decl));
2959 /* Not seen before. */
2960 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
2961 DECL_EXTERNAL (decl) = 1;
2962 TREE_PUBLIC (decl) = 1;
2963 C_DECL_IMPLICIT (decl) = 1;
2964 implicit_decl_warning (functionid, 0);
2965 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2967 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2969 /* C89 says implicit declarations are in the innermost block.
2970 So we record the decl in the standard fashion. */
2971 decl = pushdecl (decl);
2973 /* No need to call objc_check_decl here - it's a function type. */
2974 rest_of_decl_compilation (decl, 0, 0);
2976 /* Write a record describing this implicit function declaration
2977 to the prototypes file (if requested). */
2978 gen_aux_info_record (decl, 0, 1, 0);
2980 /* Possibly apply some default attributes to this implicit declaration. */
2981 decl_attributes (&decl, NULL_TREE, 0);
2986 /* Issue an error message for a reference to an undeclared variable
2987 ID, including a reference to a builtin outside of function-call
2988 context. Establish a binding of the identifier to error_mark_node
2989 in an appropriate scope, which will suppress further errors for the
2990 same identifier. The error message should be given location LOC. */
2992 undeclared_variable (location_t loc, tree id)
2994 static bool already = false;
2995 struct c_scope *scope;
2997 if (current_function_decl == 0)
2999 error_at (loc, "%qE undeclared here (not in a function)", id);
3000 scope = current_scope;
3004 if (!objc_diagnose_private_ivar (id))
3005 error_at (loc, "%qE undeclared (first use in this function)", id);
3008 inform (loc, "each undeclared identifier is reported only"
3009 " once for each function it appears in");
3013 /* If we are parsing old-style parameter decls, current_function_decl
3014 will be nonnull but current_function_scope will be null. */
3015 scope = current_function_scope ? current_function_scope : current_scope;
3017 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
3021 /* Subroutine of lookup_label, declare_label, define_label: construct a
3022 LABEL_DECL with all the proper frills. Also create a struct
3023 c_label_vars initialized for the current scope. */
3026 make_label (location_t location, tree name, bool defining,
3027 struct c_label_vars **p_label_vars)
3029 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
3030 struct c_label_vars *label_vars;
3032 DECL_CONTEXT (label) = current_function_decl;
3033 DECL_MODE (label) = VOIDmode;
3035 label_vars = ggc_alloc_c_label_vars ();
3036 label_vars->shadowed = NULL;
3037 set_spot_bindings (&label_vars->label_bindings, defining);
3038 label_vars->decls_in_scope = make_tree_vector ();
3039 label_vars->gotos = VEC_alloc (c_goto_bindings_p, gc, 0);
3040 *p_label_vars = label_vars;
3045 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3046 Create one if none exists so far for the current function.
3047 This is called when a label is used in a goto expression or
3048 has its address taken. */
3051 lookup_label (tree name)
3054 struct c_label_vars *label_vars;
3056 if (current_function_scope == 0)
3058 error ("label %qE referenced outside of any function", name);
3062 /* Use a label already defined or ref'd with this name, but not if
3063 it is inherited from a containing function and wasn't declared
3065 label = I_LABEL_DECL (name);
3066 if (label && (DECL_CONTEXT (label) == current_function_decl
3067 || C_DECLARED_LABEL_FLAG (label)))
3069 /* If the label has only been declared, update its apparent
3070 location to point here, for better diagnostics if it
3071 turns out not to have been defined. */
3072 if (DECL_INITIAL (label) == NULL_TREE)
3073 DECL_SOURCE_LOCATION (label) = input_location;
3077 /* No label binding for that identifier; make one. */
3078 label = make_label (input_location, name, false, &label_vars);
3080 /* Ordinary labels go in the current function scope. */
3081 bind_label (name, label, current_function_scope, label_vars);
3086 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3090 warn_about_goto (location_t goto_loc, tree label, tree decl)
3092 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3094 "jump into scope of identifier with variably modified type");
3096 warning_at (goto_loc, OPT_Wjump_misses_init,
3097 "jump skips variable initialization");
3098 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3099 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3102 /* Look up a label because of a goto statement. This is like
3103 lookup_label, but also issues any appropriate warnings. */
3106 lookup_label_for_goto (location_t loc, tree name)
3109 struct c_label_vars *label_vars;
3113 label = lookup_label (name);
3114 if (label == NULL_TREE)
3117 /* If we are jumping to a different function, we can't issue any
3119 if (DECL_CONTEXT (label) != current_function_decl)
3121 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3125 label_vars = I_LABEL_BINDING (name)->u.label;
3127 /* If the label has not yet been defined, then push this goto on a
3128 list for possible later warnings. */
3129 if (label_vars->label_bindings.scope == NULL)
3131 struct c_goto_bindings *g;
3133 g = ggc_alloc_c_goto_bindings ();
3135 set_spot_bindings (&g->goto_bindings, true);
3136 VEC_safe_push (c_goto_bindings_p, gc, label_vars->gotos, g);
3140 /* If there are any decls in label_vars->decls_in_scope, then this
3141 goto has missed the declaration of the decl. This happens for a
3147 Issue a warning or error. */
3148 FOR_EACH_VEC_ELT (tree, label_vars->decls_in_scope, ix, decl)
3149 warn_about_goto (loc, label, decl);
3151 if (label_vars->label_bindings.left_stmt_expr)
3153 error_at (loc, "jump into statement expression");
3154 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3160 /* Make a label named NAME in the current function, shadowing silently
3161 any that may be inherited from containing functions or containing
3162 scopes. This is called for __label__ declarations. */
3165 declare_label (tree name)
3167 struct c_binding *b = I_LABEL_BINDING (name);
3169 struct c_label_vars *label_vars;
3171 /* Check to make sure that the label hasn't already been declared
3173 if (b && B_IN_CURRENT_SCOPE (b))
3175 error ("duplicate label declaration %qE", name);
3176 locate_old_decl (b->decl);
3178 /* Just use the previous declaration. */
3182 label = make_label (input_location, name, false, &label_vars);
3183 C_DECLARED_LABEL_FLAG (label) = 1;
3185 /* Declared labels go in the current scope. */
3186 bind_label (name, label, current_scope, label_vars);
3191 /* When we define a label, issue any appropriate warnings if there are
3192 any gotos earlier in the function which jump to this label. */
3195 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3198 struct c_goto_bindings *g;
3200 FOR_EACH_VEC_ELT (c_goto_bindings_p, label_vars->gotos, ix, g)
3202 struct c_binding *b;
3203 struct c_scope *scope;
3205 /* We have a goto to this label. The goto is going forward. In
3206 g->scope, the goto is going to skip any binding which was
3207 defined after g->bindings_in_scope. */
3208 if (g->goto_bindings.scope->has_jump_unsafe_decl)
3210 for (b = g->goto_bindings.scope->bindings;
3211 b != g->goto_bindings.bindings_in_scope;
3214 if (decl_jump_unsafe (b->decl))
3215 warn_about_goto (g->loc, label, b->decl);
3219 /* We also need to warn about decls defined in any scopes
3220 between the scope of the label and the scope of the goto. */
3221 for (scope = label_vars->label_bindings.scope;
3222 scope != g->goto_bindings.scope;
3223 scope = scope->outer)
3225 gcc_assert (scope != NULL);
3226 if (scope->has_jump_unsafe_decl)
3228 if (scope == label_vars->label_bindings.scope)
3229 b = label_vars->label_bindings.bindings_in_scope;
3231 b = scope->bindings;
3232 for (; b != NULL; b = b->prev)
3234 if (decl_jump_unsafe (b->decl))
3235 warn_about_goto (g->loc, label, b->decl);
3240 if (g->goto_bindings.stmt_exprs > 0)
3242 error_at (g->loc, "jump into statement expression");
3243 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3248 /* Now that the label is defined, we will issue warnings about
3249 subsequent gotos to this label when we see them. */
3250 VEC_truncate (c_goto_bindings_p, label_vars->gotos, 0);
3251 label_vars->gotos = NULL;
3254 /* Define a label, specifying the location in the source file.
3255 Return the LABEL_DECL node for the label, if the definition is valid.
3256 Otherwise return 0. */
3259 define_label (location_t location, tree name)
3261 /* Find any preexisting label with this name. It is an error
3262 if that label has already been defined in this function, or
3263 if there is a containing function with a declared label with
3265 tree label = I_LABEL_DECL (name);
3268 && ((DECL_CONTEXT (label) == current_function_decl
3269 && DECL_INITIAL (label) != 0)
3270 || (DECL_CONTEXT (label) != current_function_decl
3271 && C_DECLARED_LABEL_FLAG (label))))
3273 error_at (location, "duplicate label %qD", label);
3274 locate_old_decl (label);
3277 else if (label && DECL_CONTEXT (label) == current_function_decl)
3279 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3281 /* The label has been used or declared already in this function,
3282 but not defined. Update its location to point to this
3284 DECL_SOURCE_LOCATION (label) = location;
3285 set_spot_bindings (&label_vars->label_bindings, true);
3287 /* Issue warnings as required about any goto statements from
3288 earlier in the function. */
3289 check_earlier_gotos (label, label_vars);
3293 struct c_label_vars *label_vars;
3295 /* No label binding for that identifier; make one. */
3296 label = make_label (location, name, true, &label_vars);
3298 /* Ordinary labels go in the current function scope. */
3299 bind_label (name, label, current_function_scope, label_vars);
3302 if (!in_system_header && lookup_name (name))
3303 warning_at (location, OPT_Wtraditional,
3304 "traditional C lacks a separate namespace "
3305 "for labels, identifier %qE conflicts", name);
3307 /* Mark label as having been defined. */
3308 DECL_INITIAL (label) = error_mark_node;
3312 /* Get the bindings for a new switch statement. This is used to issue
3313 warnings as appropriate for jumps from the switch to case or
3316 struct c_spot_bindings *
3317 c_get_switch_bindings (void)
3319 struct c_spot_bindings *switch_bindings;
3321 switch_bindings = XNEW (struct c_spot_bindings);
3322 set_spot_bindings (switch_bindings, true);
3323 return switch_bindings;
3327 c_release_switch_bindings (struct c_spot_bindings *bindings)
3329 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3333 /* This is called at the point of a case or default label to issue
3334 warnings about decls as needed. It returns true if it found an
3335 error, not just a warning. */
3338 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3339 location_t switch_loc, location_t case_loc)
3342 struct c_scope *scope;
3345 for (scope = current_scope;
3346 scope != switch_bindings->scope;
3347 scope = scope->outer)
3349 struct c_binding *b;
3351 gcc_assert (scope != NULL);
3353 if (!scope->has_jump_unsafe_decl)
3356 for (b = scope->bindings; b != NULL; b = b->prev)
3358 if (decl_jump_unsafe (b->decl))
3360 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3364 ("switch jumps into scope of identifier with "
3365 "variably modified type"));
3368 warning_at (case_loc, OPT_Wjump_misses_init,
3369 "switch jumps over variable initialization");
3370 inform (switch_loc, "switch starts here");
3371 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3377 if (switch_bindings->stmt_exprs > 0)
3380 error_at (case_loc, "switch jumps into statement expression");
3381 inform (switch_loc, "switch starts here");
3387 /* Given NAME, an IDENTIFIER_NODE,
3388 return the structure (or union or enum) definition for that name.
3389 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3390 CODE says which kind of type the caller wants;
3391 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3392 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3393 location where the tag was defined.
3394 If the wrong kind of type is found, an error is reported. */
3397 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3400 struct c_binding *b = I_TAG_BINDING (name);
3406 /* We only care about whether it's in this level if
3407 thislevel_only was set or it might be a type clash. */
3408 if (thislevel_only || TREE_CODE (b->decl) != code)
3410 /* For our purposes, a tag in the external scope is the same as
3411 a tag in the file scope. (Primarily relevant to Objective-C
3412 and its builtin structure tags, which get pushed before the
3413 file scope is created.) */
3414 if (B_IN_CURRENT_SCOPE (b)
3415 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3419 if (thislevel_only && !thislevel)
3422 if (TREE_CODE (b->decl) != code)
3424 /* Definition isn't the kind we were looking for. */
3425 pending_invalid_xref = name;
3426 pending_invalid_xref_location = input_location;
3428 /* If in the same binding level as a declaration as a tag
3429 of a different type, this must not be allowed to
3430 shadow that tag, so give the error immediately.
3431 (For example, "struct foo; union foo;" is invalid.) */
3433 pending_xref_error ();
3442 /* Print an error message now
3443 for a recent invalid struct, union or enum cross reference.
3444 We don't print them immediately because they are not invalid
3445 when used in the `struct foo;' construct for shadowing. */
3448 pending_xref_error (void)
3450 if (pending_invalid_xref != 0)
3451 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3452 pending_invalid_xref);
3453 pending_invalid_xref = 0;
3457 /* Look up NAME in the current scope and its superiors
3458 in the namespace of variables, functions and typedefs.
3459 Return a ..._DECL node of some kind representing its definition,
3460 or return 0 if it is undefined. */
3463 lookup_name (tree name)
3465 struct c_binding *b = I_SYMBOL_BINDING (name);
3466 if (b && !b->invisible)
3468 maybe_record_typedef_use (b->decl);
3474 /* Similar to `lookup_name' but look only at the indicated scope. */
3477 lookup_name_in_scope (tree name, struct c_scope *scope)
3479 struct c_binding *b;
3481 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3482 if (B_IN_SCOPE (b, scope))
3487 /* Create the predefined scalar types of C,
3488 and some nodes representing standard constants (0, 1, (void *) 0).
3489 Initialize the global scope.
3490 Make definitions for built-in primitive functions. */
3493 c_init_decl_processing (void)
3495 location_t save_loc = input_location;
3497 /* Initialize reserved words for parser. */
3500 current_function_decl = 0;
3502 gcc_obstack_init (&parser_obstack);
3504 /* Make the externals scope. */
3506 external_scope = current_scope;
3508 /* Declarations from c_common_nodes_and_builtins must not be associated
3509 with this input file, lest we get differences between using and not
3510 using preprocessed headers. */
3511 input_location = BUILTINS_LOCATION;
3513 c_common_nodes_and_builtins ();
3515 /* In C, comparisons and TRUTH_* expressions have type int. */
3516 truthvalue_type_node = integer_type_node;
3517 truthvalue_true_node = integer_one_node;
3518 truthvalue_false_node = integer_zero_node;
3520 /* Even in C99, which has a real boolean type. */
3521 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3522 boolean_type_node));
3524 input_location = save_loc;
3526 pedantic_lvalues = true;
3528 make_fname_decl = c_make_fname_decl;
3529 start_fname_decls ();
3532 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3533 give the decl, NAME is the initialization string and TYPE_DEP
3534 indicates whether NAME depended on the type of the function. As we
3535 don't yet implement delayed emission of static data, we mark the
3536 decl as emitted so it is not placed in the output. Anything using
3537 it must therefore pull out the STRING_CST initializer directly.
3541 c_make_fname_decl (location_t loc, tree id, int type_dep)
3543 const char *name = fname_as_string (type_dep);
3544 tree decl, type, init;
3545 size_t length = strlen (name);
3547 type = build_array_type (char_type_node,
3548 build_index_type (size_int (length)));
3549 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3551 decl = build_decl (loc, VAR_DECL, id, type);
3553 TREE_STATIC (decl) = 1;
3554 TREE_READONLY (decl) = 1;
3555 DECL_ARTIFICIAL (decl) = 1;
3557 init = build_string (length + 1, name);
3558 free (CONST_CAST (char *, name));
3559 TREE_TYPE (init) = type;
3560 DECL_INITIAL (decl) = init;
3562 TREE_USED (decl) = 1;
3564 if (current_function_decl
3565 /* For invalid programs like this:
3568 const char* p = __FUNCTION__;
3570 the __FUNCTION__ is believed to appear in K&R style function
3571 parameter declarator. In that case we still don't have
3573 && (!seen_error () || current_function_scope))
3575 DECL_CONTEXT (decl) = current_function_decl;
3576 bind (id, decl, current_function_scope,
3577 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3580 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
3586 c_builtin_function (tree decl)
3588 tree type = TREE_TYPE (decl);
3589 tree id = DECL_NAME (decl);
3591 const char *name = IDENTIFIER_POINTER (id);
3592 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
3594 /* Should never be called on a symbol with a preexisting meaning. */
3595 gcc_assert (!I_SYMBOL_BINDING (id));
3597 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
3600 /* Builtins in the implementation namespace are made visible without
3601 needing to be explicitly declared. See push_file_scope. */
3602 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3604 DECL_CHAIN (decl) = visible_builtins;
3605 visible_builtins = decl;
3612 c_builtin_function_ext_scope (tree decl)
3614 tree type = TREE_TYPE (decl);
3615 tree id = DECL_NAME (decl);
3617 const char *name = IDENTIFIER_POINTER (id);
3618 C_DECL_BUILTIN_PROTOTYPE (decl) = prototype_p (type);
3620 /* Should never be called on a symbol with a preexisting meaning. */
3621 gcc_assert (!I_SYMBOL_BINDING (id));
3623 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
3626 /* Builtins in the implementation namespace are made visible without
3627 needing to be explicitly declared. See push_file_scope. */
3628 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3630 DECL_CHAIN (decl) = visible_builtins;
3631 visible_builtins = decl;
3637 /* Called when a declaration is seen that contains no names to declare.
3638 If its type is a reference to a structure, union or enum inherited
3639 from a containing scope, shadow that tag name for the current scope
3640 with a forward reference.
3641 If its type defines a new named structure or union
3642 or defines an enum, it is valid but we need not do anything here.
3643 Otherwise, it is an error. */
3646 shadow_tag (const struct c_declspecs *declspecs)
3648 shadow_tag_warned (declspecs, 0);
3651 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3654 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
3656 bool found_tag = false;
3658 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
3660 tree value = declspecs->type;
3661 enum tree_code code = TREE_CODE (value);
3663 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3664 /* Used to test also that TYPE_SIZE (value) != 0.
3665 That caused warning for `struct foo;' at top level in the file. */
3667 tree name = TYPE_NAME (value);
3672 if (declspecs->restrict_p)
3674 error ("invalid use of %<restrict%>");
3680 if (warned != 1 && code != ENUMERAL_TYPE)
3681 /* Empty unnamed enum OK */
3683 pedwarn (input_location, 0,
3684 "unnamed struct/union that defines no instances");
3688 else if (declspecs->typespec_kind != ctsk_tagdef
3689 && declspecs->typespec_kind != ctsk_tagfirstref
3690 && declspecs->storage_class != csc_none)
3693 pedwarn (input_location, 0,
3694 "empty declaration with storage class specifier "
3695 "does not redeclare tag");
3697 pending_xref_error ();
3699 else if (declspecs->typespec_kind != ctsk_tagdef
3700 && declspecs->typespec_kind != ctsk_tagfirstref
3701 && (declspecs->const_p
3702 || declspecs->volatile_p
3703 || declspecs->restrict_p
3704 || declspecs->address_space))
3707 pedwarn (input_location, 0,
3708 "empty declaration with type qualifier "
3709 "does not redeclare tag");
3711 pending_xref_error ();
3713 else if (declspecs->typespec_kind != ctsk_tagdef
3714 && declspecs->typespec_kind != ctsk_tagfirstref
3715 && declspecs->alignas_p)
3718 pedwarn (input_location, 0,
3719 "empty declaration with %<_Alignas%> "
3720 "does not redeclare tag");
3722 pending_xref_error ();
3726 pending_invalid_xref = 0;
3727 t = lookup_tag (code, name, 1, NULL);
3731 t = make_node (code);
3732 pushtag (input_location, name, t);
3738 if (warned != 1 && !in_system_header)
3740 pedwarn (input_location, 0,
3741 "useless type name in empty declaration");
3746 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
3748 pedwarn (input_location, 0, "useless type name in empty declaration");
3752 pending_invalid_xref = 0;
3754 if (declspecs->inline_p)
3756 error ("%<inline%> in empty declaration");
3760 if (declspecs->noreturn_p)
3762 error ("%<_Noreturn%> in empty declaration");
3766 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3768 error ("%<auto%> in file-scope empty declaration");
3772 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3774 error ("%<register%> in file-scope empty declaration");
3778 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
3780 warning (0, "useless storage class specifier in empty declaration");
3784 if (!warned && !in_system_header && declspecs->thread_p)
3786 warning (0, "useless %<__thread%> in empty declaration");
3790 if (!warned && !in_system_header && (declspecs->const_p
3791 || declspecs->volatile_p
3792 || declspecs->restrict_p
3793 || declspecs->address_space))
3795 warning (0, "useless type qualifier in empty declaration");
3799 if (!warned && !in_system_header && declspecs->alignas_p)
3801 warning (0, "useless %<_Alignas%> in empty declaration");
3808 pedwarn (input_location, 0, "empty declaration");
3813 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3814 bits. SPECS represents declaration specifiers that the grammar
3815 only permits to contain type qualifiers and attributes. */
3818 quals_from_declspecs (const struct c_declspecs *specs)
3820 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3821 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3822 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)
3823 | (ENCODE_QUAL_ADDR_SPACE (specs->address_space)));
3824 gcc_assert (!specs->type
3825 && !specs->decl_attr
3826 && specs->typespec_word == cts_none
3827 && specs->storage_class == csc_none
3828 && !specs->typedef_p
3829 && !specs->explicit_signed_p
3830 && !specs->deprecated_p
3832 && !specs->long_long_p
3835 && !specs->unsigned_p
3836 && !specs->complex_p
3838 && !specs->noreturn_p
3839 && !specs->thread_p);
3843 /* Construct an array declarator. LOC is the location of the
3844 beginning of the array (usually the opening brace). EXPR is the
3845 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3846 inside the [] (to be applied to the pointer to which a parameter
3847 array is converted). STATIC_P is true if "static" is inside the
3848 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3849 VLA of unspecified length which is nevertheless a complete type,
3850 false otherwise. The field for the contained declarator is left to
3851 be filled in by set_array_declarator_inner. */
3853 struct c_declarator *
3854 build_array_declarator (location_t loc,
3855 tree expr, struct c_declspecs *quals, bool static_p,
3858 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3859 struct c_declarator);
3860 declarator->id_loc = loc;
3861 declarator->kind = cdk_array;
3862 declarator->declarator = 0;
3863 declarator->u.array.dimen = expr;
3866 declarator->u.array.attrs = quals->attrs;
3867 declarator->u.array.quals = quals_from_declspecs (quals);
3871 declarator->u.array.attrs = NULL_TREE;
3872 declarator->u.array.quals = 0;
3874 declarator->u.array.static_p = static_p;
3875 declarator->u.array.vla_unspec_p = vla_unspec_p;
3878 if (static_p || quals != NULL)
3879 pedwarn (loc, OPT_pedantic,
3880 "ISO C90 does not support %<static%> or type "
3881 "qualifiers in parameter array declarators");
3883 pedwarn (loc, OPT_pedantic,
3884 "ISO C90 does not support %<[*]%> array declarators");
3888 if (!current_scope->parm_flag)
3891 error_at (loc, "%<[*]%> not allowed in other than "
3892 "function prototype scope");
3893 declarator->u.array.vla_unspec_p = false;
3896 current_scope->had_vla_unspec = true;
3901 /* Set the contained declarator of an array declarator. DECL is the
3902 declarator, as constructed by build_array_declarator; INNER is what
3903 appears on the left of the []. */
3905 struct c_declarator *
3906 set_array_declarator_inner (struct c_declarator *decl,
3907 struct c_declarator *inner)
3909 decl->declarator = inner;
3913 /* INIT is a constructor that forms DECL's initializer. If the final
3914 element initializes a flexible array field, add the size of that
3915 initializer to DECL's size. */
3918 add_flexible_array_elts_to_size (tree decl, tree init)
3922 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3925 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3926 type = TREE_TYPE (elt);
3927 if (TREE_CODE (type) == ARRAY_TYPE
3928 && TYPE_SIZE (type) == NULL_TREE
3929 && TYPE_DOMAIN (type) != NULL_TREE
3930 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3932 complete_array_type (&type, elt, false);
3934 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3935 DECL_SIZE_UNIT (decl)
3936 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3940 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3941 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3942 before the type name, and set *EXPR_CONST_OPERANDS, if
3943 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3944 appear in a constant expression. */
3947 groktypename (struct c_type_name *type_name, tree *expr,
3948 bool *expr_const_operands)
3951 tree attrs = type_name->specs->attrs;
3953 type_name->specs->attrs = NULL_TREE;
3955 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3956 false, NULL, &attrs, expr, expr_const_operands,
3959 /* Apply attributes. */
3960 decl_attributes (&type, attrs, 0);
3965 /* Decode a declarator in an ordinary declaration or data definition.
3966 This is called as soon as the type information and variable name
3967 have been parsed, before parsing the initializer if any.
3968 Here we create the ..._DECL node, fill in its type,
3969 and put it on the list of decls for the current context.
3970 The ..._DECL node is returned as the value.
3972 Exception: for arrays where the length is not specified,
3973 the type is left null, to be filled in by `finish_decl'.
3975 Function definitions do not come here; they go to start_function
3976 instead. However, external and forward declarations of functions
3977 do go through here. Structure field declarations are done by
3978 grokfield and not through here. */
3981 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3982 bool initialized, tree attributes)
3986 tree expr = NULL_TREE;
3987 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3989 /* An object declared as __attribute__((deprecated)) suppresses
3990 warnings of uses of other deprecated items. */
3991 if (lookup_attribute ("deprecated", attributes))
3992 deprecated_state = DEPRECATED_SUPPRESS;
3994 decl = grokdeclarator (declarator, declspecs,
3995 NORMAL, initialized, NULL, &attributes, &expr, NULL,
4001 add_stmt (fold_convert (void_type_node, expr));
4003 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
4004 warning (OPT_Wmain, "%q+D is usually a function", decl);
4007 /* Is it valid for this decl to have an initializer at all?
4008 If not, set INITIALIZED to zero, which will indirectly
4009 tell 'finish_decl' to ignore the initializer once it is parsed. */
4010 switch (TREE_CODE (decl))
4013 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4018 error ("function %qD is initialized like a variable", decl);
4023 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4024 error ("parameter %qD is initialized", decl);
4029 /* Don't allow initializations for incomplete types except for
4030 arrays which might be completed by the initialization. */
4032 /* This can happen if the array size is an undefined macro.
4033 We already gave a warning, so we don't need another one. */
4034 if (TREE_TYPE (decl) == error_mark_node)
4036 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
4038 /* A complete type is ok if size is fixed. */
4040 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
4041 || C_DECL_VARIABLE_SIZE (decl))
4043 error ("variable-sized object may not be initialized");
4047 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
4049 error ("variable %qD has initializer but incomplete type", decl);
4052 else if (C_DECL_VARIABLE_SIZE (decl))
4054 /* Although C99 is unclear about whether incomplete arrays
4055 of VLAs themselves count as VLAs, it does not make
4056 sense to permit them to be initialized given that
4057 ordinary VLAs may not be initialized. */
4058 error ("variable-sized object may not be initialized");
4065 if (current_scope == file_scope)
4066 TREE_STATIC (decl) = 1;
4068 /* Tell 'pushdecl' this is an initialized decl
4069 even though we don't yet have the initializer expression.
4070 Also tell 'finish_decl' it may store the real initializer. */
4071 DECL_INITIAL (decl) = error_mark_node;
4074 /* If this is a function declaration, write a record describing it to the
4075 prototypes file (if requested). */
4077 if (TREE_CODE (decl) == FUNCTION_DECL)
4078 gen_aux_info_record (decl, 0, 0, prototype_p (TREE_TYPE (decl)));
4080 /* ANSI specifies that a tentative definition which is not merged with
4081 a non-tentative definition behaves exactly like a definition with an
4082 initializer equal to zero. (Section 3.7.2)
4084 -fno-common gives strict ANSI behavior, though this tends to break
4085 a large body of code that grew up without this rule.
4087 Thread-local variables are never common, since there's no entrenched
4088 body of code to break, and it allows more efficient variable references
4089 in the presence of dynamic linking. */
4091 if (TREE_CODE (decl) == VAR_DECL
4093 && TREE_PUBLIC (decl)
4094 && !DECL_THREAD_LOCAL_P (decl)
4096 DECL_COMMON (decl) = 1;
4098 /* Set attributes here so if duplicate decl, will have proper attributes. */
4099 decl_attributes (&decl, attributes, 0);
4101 /* Handle gnu_inline attribute. */
4102 if (declspecs->inline_p
4103 && !flag_gnu89_inline
4104 && TREE_CODE (decl) == FUNCTION_DECL
4105 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
4106 || current_function_decl))
4108 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
4110 else if (declspecs->storage_class != csc_static)
4111 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
4114 if (TREE_CODE (decl) == FUNCTION_DECL
4115 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
4117 struct c_declarator *ce = declarator;
4119 if (ce->kind == cdk_pointer)
4120 ce = declarator->declarator;
4121 if (ce->kind == cdk_function)
4123 tree args = ce->u.arg_info->parms;
4124 for (; args; args = DECL_CHAIN (args))
4126 tree type = TREE_TYPE (args);
4127 if (type && INTEGRAL_TYPE_P (type)
4128 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4129 DECL_ARG_TYPE (args) = integer_type_node;
4134 if (TREE_CODE (decl) == FUNCTION_DECL
4135 && DECL_DECLARED_INLINE_P (decl)
4136 && DECL_UNINLINABLE (decl)
4137 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4138 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4141 /* C99 6.7.4p3: An inline definition of a function with external
4142 linkage shall not contain a definition of a modifiable object
4143 with static storage duration... */
4144 if (TREE_CODE (decl) == VAR_DECL
4145 && current_scope != file_scope
4146 && TREE_STATIC (decl)
4147 && !TREE_READONLY (decl)
4148 && DECL_DECLARED_INLINE_P (current_function_decl)
4149 && DECL_EXTERNAL (current_function_decl))
4150 record_inline_static (input_location, current_function_decl,
4151 decl, csi_modifiable);
4153 if (c_dialect_objc ()
4154 && (TREE_CODE (decl) == VAR_DECL
4155 || TREE_CODE (decl) == FUNCTION_DECL))
4156 objc_check_global_decl (decl);
4158 /* Add this decl to the current scope.
4159 TEM may equal DECL or it may be a previous decl of the same name. */
4160 tem = pushdecl (decl);
4162 if (initialized && DECL_EXTERNAL (tem))
4164 DECL_EXTERNAL (tem) = 0;
4165 TREE_STATIC (tem) = 1;
4171 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4172 DECL or the non-array element type if DECL is an uninitialized array.
4173 If that type has a const member, diagnose this. */
4176 diagnose_uninitialized_cst_member (tree decl, tree type)
4179 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4182 if (TREE_CODE (field) != FIELD_DECL)
4184 field_type = strip_array_types (TREE_TYPE (field));
4186 if (TYPE_QUALS (field_type) & TYPE_QUAL_CONST)
4188 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4189 "uninitialized const member in %qT is invalid in C++",
4190 strip_array_types (TREE_TYPE (decl)));
4191 inform (DECL_SOURCE_LOCATION (field), "%qD should be initialized", field);
4194 if (TREE_CODE (field_type) == RECORD_TYPE
4195 || TREE_CODE (field_type) == UNION_TYPE)
4196 diagnose_uninitialized_cst_member (decl, field_type);
4200 /* Finish processing of a declaration;
4201 install its initial value.
4202 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4203 If the length of an array type is not known before,
4204 it must be determined now, from the initial value, or it is an error.
4206 INIT_LOC is the location of the initial value. */
4209 finish_decl (tree decl, location_t init_loc, tree init,
4210 tree origtype, tree asmspec_tree)
4213 bool was_incomplete = (DECL_SIZE (decl) == 0);
4214 const char *asmspec = 0;
4216 /* If a name was specified, get the string. */
4217 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4218 && DECL_FILE_SCOPE_P (decl))
4219 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4221 asmspec = TREE_STRING_POINTER (asmspec_tree);
4223 if (TREE_CODE (decl) == VAR_DECL
4224 && TREE_STATIC (decl)
4225 && global_bindings_p ())
4226 /* So decl is a global variable. Record the types it uses
4227 so that we can decide later to emit debug info for them. */
4228 record_types_used_by_current_var_decl (decl);
4230 /* If `start_decl' didn't like having an initialization, ignore it now. */
4231 if (init != 0 && DECL_INITIAL (decl) == 0)
4234 /* Don't crash if parm is initialized. */
4235 if (TREE_CODE (decl) == PARM_DECL)
4239 store_init_value (init_loc, decl, init, origtype);
4241 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4242 || TREE_CODE (decl) == FUNCTION_DECL
4243 || TREE_CODE (decl) == FIELD_DECL))
4244 objc_check_decl (decl);
4246 type = TREE_TYPE (decl);
4248 /* Deduce size of array from initialization, if not already known. */
4249 if (TREE_CODE (type) == ARRAY_TYPE
4250 && TYPE_DOMAIN (type) == 0
4251 && TREE_CODE (decl) != TYPE_DECL)
4254 = (TREE_STATIC (decl)
4255 /* Even if pedantic, an external linkage array
4256 may have incomplete type at first. */
4257 ? pedantic && !TREE_PUBLIC (decl)
4258 : !DECL_EXTERNAL (decl));
4260 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4263 /* Get the completed type made by complete_array_type. */
4264 type = TREE_TYPE (decl);
4269 error ("initializer fails to determine size of %q+D", decl);
4274 error ("array size missing in %q+D", decl);
4275 /* If a `static' var's size isn't known,
4276 make it extern as well as static, so it does not get
4278 If it is not `static', then do not mark extern;
4279 finish_incomplete_decl will give it a default size
4280 and it will get allocated. */
4281 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4282 DECL_EXTERNAL (decl) = 1;
4286 error ("zero or negative size array %q+D", decl);
4290 /* For global variables, update the copy of the type that
4291 exists in the binding. */
4292 if (TREE_PUBLIC (decl))
4294 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4295 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4296 b_ext = b_ext->shadowed;
4299 if (b_ext->u.type && comptypes (b_ext->u.type, type))
4300 b_ext->u.type = composite_type (b_ext->u.type, type);
4302 b_ext->u.type = type;
4311 if (DECL_INITIAL (decl))
4312 TREE_TYPE (DECL_INITIAL (decl)) = type;
4314 relayout_decl (decl);
4317 if (TREE_CODE (decl) == VAR_DECL)
4319 if (init && TREE_CODE (init) == CONSTRUCTOR)
4320 add_flexible_array_elts_to_size (decl, init);
4322 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4323 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4324 layout_decl (decl, 0);
4326 if (DECL_SIZE (decl) == 0
4327 /* Don't give an error if we already gave one earlier. */
4328 && TREE_TYPE (decl) != error_mark_node
4329 && (TREE_STATIC (decl)
4330 /* A static variable with an incomplete type
4331 is an error if it is initialized.
4332 Also if it is not file scope.
4333 Otherwise, let it through, but if it is not `extern'
4334 then it may cause an error message later. */
4335 ? (DECL_INITIAL (decl) != 0
4336 || !DECL_FILE_SCOPE_P (decl))
4337 /* An automatic variable with an incomplete type
4339 : !DECL_EXTERNAL (decl)))
4341 error ("storage size of %q+D isn%'t known", decl);
4342 TREE_TYPE (decl) = error_mark_node;
4345 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4346 && DECL_SIZE (decl) != 0)
4348 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4349 constant_expression_warning (DECL_SIZE (decl));
4352 error ("storage size of %q+D isn%'t constant", decl);
4353 TREE_TYPE (decl) = error_mark_node;
4357 if (TREE_USED (type))
4359 TREE_USED (decl) = 1;
4360 DECL_READ_P (decl) = 1;
4364 /* If this is a function and an assembler name is specified, reset DECL_RTL
4365 so we can give it its new name. Also, update builtin_decl if it
4366 was a normal built-in. */
4367 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4369 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4370 set_builtin_user_assembler_name (decl, asmspec);
4371 set_user_assembler_name (decl, asmspec);
4374 /* If #pragma weak was used, mark the decl weak now. */
4375 maybe_apply_pragma_weak (decl);
4377 /* Output the assembler code and/or RTL code for variables and functions,
4378 unless the type is an undefined structure or union.
4379 If not, it will get done when the type is completed. */
4381 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4383 /* Determine the ELF visibility. */
4384 if (TREE_PUBLIC (decl))
4385 c_determine_visibility (decl);
4387 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4388 if (c_dialect_objc ())
4389 objc_check_decl (decl);
4393 /* If this is not a static variable, issue a warning.
4394 It doesn't make any sense to give an ASMSPEC for an
4395 ordinary, non-register local variable. Historically,
4396 GCC has accepted -- but ignored -- the ASMSPEC in
4398 if (!DECL_FILE_SCOPE_P (decl)
4399 && TREE_CODE (decl) == VAR_DECL
4400 && !C_DECL_REGISTER (decl)
4401 && !TREE_STATIC (decl))
4402 warning (0, "ignoring asm-specifier for non-static local "
4403 "variable %q+D", decl);
4405 set_user_assembler_name (decl, asmspec);
4408 if (DECL_FILE_SCOPE_P (decl))
4410 if (DECL_INITIAL (decl) == NULL_TREE
4411 || DECL_INITIAL (decl) == error_mark_node)
4412 /* Don't output anything
4413 when a tentative file-scope definition is seen.
4414 But at end of compilation, do output code for them. */
4415 DECL_DEFER_OUTPUT (decl) = 1;
4416 if (asmspec && C_DECL_REGISTER (decl))
4417 DECL_HARD_REGISTER (decl) = 1;
4418 rest_of_decl_compilation (decl, true, 0);
4422 /* In conjunction with an ASMSPEC, the `register'
4423 keyword indicates that we should place the variable
4424 in a particular register. */
4425 if (asmspec && C_DECL_REGISTER (decl))
4427 DECL_HARD_REGISTER (decl) = 1;
4428 /* This cannot be done for a structure with volatile
4429 fields, on which DECL_REGISTER will have been
4431 if (!DECL_REGISTER (decl))
4432 error ("cannot put object with volatile field into register");
4435 if (TREE_CODE (decl) != FUNCTION_DECL)
4437 /* If we're building a variable sized type, and we might be
4438 reachable other than via the top of the current binding
4439 level, then create a new BIND_EXPR so that we deallocate
4440 the object at the right time. */
4441 /* Note that DECL_SIZE can be null due to errors. */
4442 if (DECL_SIZE (decl)
4443 && !TREE_CONSTANT (DECL_SIZE (decl))
4444 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4447 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4448 TREE_SIDE_EFFECTS (bind) = 1;
4450 BIND_EXPR_BODY (bind) = push_stmt_list ();
4452 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4458 if (!DECL_FILE_SCOPE_P (decl))
4460 /* Recompute the RTL of a local array now
4461 if it used to be an incomplete type. */
4463 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4465 /* If we used it already as memory, it must stay in memory. */
4466 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4467 /* If it's still incomplete now, no init will save it. */
4468 if (DECL_SIZE (decl) == 0)
4469 DECL_INITIAL (decl) = 0;
4474 if (TREE_CODE (decl) == TYPE_DECL)
4476 if (!DECL_FILE_SCOPE_P (decl)
4477 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4478 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4480 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4483 /* Install a cleanup (aka destructor) if one was given. */
4484 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4486 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4489 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4490 tree cleanup_decl = lookup_name (cleanup_id);
4494 /* Build "cleanup(&decl)" for the destructor. */
4495 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4496 vec = VEC_alloc (tree, gc, 1);
4497 VEC_quick_push (tree, vec, cleanup);
4498 cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4499 cleanup_decl, vec, NULL);
4500 VEC_free (tree, gc, vec);
4502 /* Don't warn about decl unused; the cleanup uses it. */
4503 TREE_USED (decl) = 1;
4504 TREE_USED (cleanup_decl) = 1;
4505 DECL_READ_P (decl) = 1;
4507 push_cleanup (decl, cleanup, false);
4512 && TREE_CODE (decl) == VAR_DECL
4513 && !DECL_EXTERNAL (decl)
4514 && DECL_INITIAL (decl) == NULL_TREE)
4516 type = strip_array_types (type);
4517 if (TREE_READONLY (decl))
4518 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4519 "uninitialized const %qD is invalid in C++", decl);
4520 else if ((TREE_CODE (type) == RECORD_TYPE
4521 || TREE_CODE (type) == UNION_TYPE)
4522 && C_TYPE_FIELDS_READONLY (type))
4523 diagnose_uninitialized_cst_member (decl, type);
4526 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
4529 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4530 EXPR is NULL or a pointer to an expression that needs to be
4531 evaluated for the side effects of array size expressions in the
4535 grokparm (const struct c_parm *parm, tree *expr)
4537 tree attrs = parm->attrs;
4538 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4539 NULL, &attrs, expr, NULL, DEPRECATED_NORMAL);
4541 decl_attributes (&decl, attrs, 0);
4546 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4547 and push that on the current scope. EXPR is a pointer to an
4548 expression that needs to be evaluated for the side effects of array
4549 size expressions in the parameters. */
4552 push_parm_decl (const struct c_parm *parm, tree *expr)
4554 tree attrs = parm->attrs;
4557 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4558 &attrs, expr, NULL, DEPRECATED_NORMAL);
4559 decl_attributes (&decl, attrs, 0);
4561 decl = pushdecl (decl);
4563 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4566 /* Mark all the parameter declarations to date as forward decls.
4567 Also diagnose use of this extension. */
4570 mark_forward_parm_decls (void)
4572 struct c_binding *b;
4574 if (pedantic && !current_scope->warned_forward_parm_decls)
4576 pedwarn (input_location, OPT_pedantic,
4577 "ISO C forbids forward parameter declarations");
4578 current_scope->warned_forward_parm_decls = true;
4581 for (b = current_scope->bindings; b; b = b->prev)
4582 if (TREE_CODE (b->decl) == PARM_DECL)
4583 TREE_ASM_WRITTEN (b->decl) = 1;
4586 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4587 literal, which may be an incomplete array type completed by the
4588 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4589 literal. NON_CONST is true if the initializers contain something
4590 that cannot occur in a constant expression. */
4593 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4595 /* We do not use start_decl here because we have a type, not a declarator;
4596 and do not use finish_decl because the decl should be stored inside
4597 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4602 if (type == error_mark_node
4603 || init == error_mark_node)
4604 return error_mark_node;
4606 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4607 DECL_EXTERNAL (decl) = 0;
4608 TREE_PUBLIC (decl) = 0;
4609 TREE_STATIC (decl) = (current_scope == file_scope);
4610 DECL_CONTEXT (decl) = current_function_decl;
4611 TREE_USED (decl) = 1;
4612 DECL_READ_P (decl) = 1;
4613 TREE_TYPE (decl) = type;
4614 TREE_READONLY (decl) = TYPE_READONLY (type);
4615 store_init_value (loc, decl, init, NULL_TREE);
4617 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4619 int failure = complete_array_type (&TREE_TYPE (decl),
4620 DECL_INITIAL (decl), true);
4621 gcc_assert (!failure);
4623 type = TREE_TYPE (decl);
4624 TREE_TYPE (DECL_INITIAL (decl)) = type;
4627 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4628 return error_mark_node;
4630 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4631 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4632 TREE_SIDE_EFFECTS (complit) = 1;
4634 layout_decl (decl, 0);
4636 if (TREE_STATIC (decl))
4638 /* This decl needs a name for the assembler output. */
4639 set_compound_literal_name (decl);
4640 DECL_DEFER_OUTPUT (decl) = 1;
4641 DECL_COMDAT (decl) = 1;
4642 DECL_ARTIFICIAL (decl) = 1;
4643 DECL_IGNORED_P (decl) = 1;
4645 rest_of_decl_compilation (decl, 1, 0);
4650 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4651 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4657 /* Check the type of a compound literal. Here we just check that it
4658 is valid for C++. */
4661 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4664 && (type_name->specs->typespec_kind == ctsk_tagdef
4665 || type_name->specs->typespec_kind == ctsk_tagfirstref))
4666 warning_at (loc, OPT_Wc___compat,
4667 "defining a type in a compound literal is invalid in C++");
4670 /* Determine whether TYPE is a structure with a flexible array member,
4671 or a union containing such a structure (possibly recursively). */
4674 flexible_array_type_p (tree type)
4677 switch (TREE_CODE (type))
4680 x = TYPE_FIELDS (type);
4683 while (DECL_CHAIN (x) != NULL_TREE)
4685 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4686 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4687 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4688 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4692 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = DECL_CHAIN (x))
4694 if (flexible_array_type_p (TREE_TYPE (x)))
4703 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4704 replacing with appropriate values if they are invalid. */
4706 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4709 unsigned int max_width;
4710 unsigned HOST_WIDE_INT w;
4711 const char *name = (orig_name
4712 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4713 : _("<anonymous>"));
4715 /* Detect and ignore out of range field width and process valid
4717 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)))
4719 error ("bit-field %qs width not an integer constant", name);
4720 *width = integer_one_node;
4724 if (TREE_CODE (*width) != INTEGER_CST)
4726 *width = c_fully_fold (*width, false, NULL);
4727 if (TREE_CODE (*width) == INTEGER_CST)
4728 pedwarn (input_location, OPT_pedantic,
4729 "bit-field %qs width not an integer constant expression",
4732 if (TREE_CODE (*width) != INTEGER_CST)
4734 error ("bit-field %qs width not an integer constant", name);
4735 *width = integer_one_node;
4737 constant_expression_warning (*width);
4738 if (tree_int_cst_sgn (*width) < 0)
4740 error ("negative width in bit-field %qs", name);
4741 *width = integer_one_node;
4743 else if (integer_zerop (*width) && orig_name)
4745 error ("zero width for bit-field %qs", name);
4746 *width = integer_one_node;
4750 /* Detect invalid bit-field type. */
4751 if (TREE_CODE (*type) != INTEGER_TYPE
4752 && TREE_CODE (*type) != BOOLEAN_TYPE
4753 && TREE_CODE (*type) != ENUMERAL_TYPE)
4755 error ("bit-field %qs has invalid type", name);
4756 *type = unsigned_type_node;
4759 type_mv = TYPE_MAIN_VARIANT (*type);
4760 if (!in_system_header
4761 && type_mv != integer_type_node
4762 && type_mv != unsigned_type_node
4763 && type_mv != boolean_type_node)
4764 pedwarn (input_location, OPT_pedantic,
4765 "type of bit-field %qs is a GCC extension", name);
4767 max_width = TYPE_PRECISION (*type);
4769 if (0 < compare_tree_int (*width, max_width))
4771 error ("width of %qs exceeds its type", name);
4773 *width = build_int_cst (integer_type_node, w);
4776 w = tree_low_cst (*width, 1);
4778 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4780 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4782 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
4783 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
4784 warning (0, "%qs is narrower than values of its type", name);
4790 /* Print warning about variable length array if necessary. */
4793 warn_variable_length_array (tree name, tree size)
4795 int const_size = TREE_CONSTANT (size);
4797 if (!flag_isoc99 && pedantic && warn_vla != 0)
4802 pedwarn (input_location, OPT_Wvla,
4803 "ISO C90 forbids array %qE whose size "
4804 "can%'t be evaluated",
4807 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4808 "can%'t be evaluated");
4813 pedwarn (input_location, OPT_Wvla,
4814 "ISO C90 forbids variable length array %qE",
4817 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4820 else if (warn_vla > 0)
4826 "the size of array %qE can"
4827 "%'t be evaluated", name);
4830 "the size of array can %'t be evaluated");
4836 "variable length array %qE is used",
4840 "variable length array is used");
4845 /* Given declspecs and a declarator,
4846 determine the name and type of the object declared
4847 and construct a ..._DECL node for it.
4848 (In one case we can return a ..._TYPE node instead.
4849 For invalid input we sometimes return 0.)
4851 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4853 DECL_CONTEXT says which syntactic context this declaration is in:
4854 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4855 FUNCDEF for a function definition. Like NORMAL but a few different
4856 error messages in each case. Return value may be zero meaning
4857 this definition is too screwy to try to parse.
4858 PARM for a parameter declaration (either within a function prototype
4859 or before a function body). Make a PARM_DECL, or return void_type_node.
4860 TYPENAME if for a typename (in a cast or sizeof).
4861 Don't make a DECL node; just return the ..._TYPE node.
4862 FIELD for a struct or union field; make a FIELD_DECL.
4863 INITIALIZED is true if the decl has an initializer.
4864 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4865 representing the width of the bit-field.
4866 DECL_ATTRS points to the list of attributes that should be added to this
4867 decl. Any nested attributes that belong on the decl itself will be
4869 If EXPR is not NULL, any expressions that need to be evaluated as
4870 part of evaluating variably modified types will be stored in *EXPR.
4871 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4872 set to indicate whether operands in *EXPR can be used in constant
4874 DEPRECATED_STATE is a deprecated_states value indicating whether
4875 deprecation warnings should be suppressed.
4877 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4878 It may also be so in the PARM case, for a prototype where the
4879 argument type is specified but not the name.
4881 This function is where the complicated C meanings of `static'
4882 and `extern' are interpreted. */
4885 grokdeclarator (const struct c_declarator *declarator,
4886 struct c_declspecs *declspecs,
4887 enum decl_context decl_context, bool initialized, tree *width,
4888 tree *decl_attrs, tree *expr, bool *expr_const_operands,
4889 enum deprecated_states deprecated_state)
4891 tree type = declspecs->type;
4892 bool threadp = declspecs->thread_p;
4893 enum c_storage_class storage_class = declspecs->storage_class;
4897 int type_quals = TYPE_UNQUALIFIED;
4898 tree name = NULL_TREE;
4899 bool funcdef_flag = false;
4900 bool funcdef_syntax = false;
4901 bool size_varies = false;
4902 tree decl_attr = declspecs->decl_attr;
4903 int array_ptr_quals = TYPE_UNQUALIFIED;
4904 tree array_ptr_attrs = NULL_TREE;
4905 int array_parm_static = 0;
4906 bool array_parm_vla_unspec_p = false;
4907 tree returned_attrs = NULL_TREE;
4908 bool bitfield = width != NULL;
4910 struct c_arg_info *arg_info = 0;
4911 addr_space_t as1, as2, address_space;
4912 location_t loc = UNKNOWN_LOCATION;
4915 bool expr_const_operands_dummy;
4916 enum c_declarator_kind first_non_attr_kind;
4917 unsigned int alignas_align = 0;
4919 if (TREE_CODE (type) == ERROR_MARK)
4920 return error_mark_node;
4923 if (expr_const_operands == NULL)
4924 expr_const_operands = &expr_const_operands_dummy;
4926 *expr = declspecs->expr;
4927 *expr_const_operands = declspecs->expr_const_operands;
4929 if (decl_context == FUNCDEF)
4930 funcdef_flag = true, decl_context = NORMAL;
4932 /* Look inside a declarator for the name being declared
4933 and get it as an IDENTIFIER_NODE, for an error message. */
4935 const struct c_declarator *decl = declarator;
4937 first_non_attr_kind = cdk_attrs;
4947 funcdef_syntax = (decl->kind == cdk_function);
4948 decl = decl->declarator;
4949 if (first_non_attr_kind == cdk_attrs)
4950 first_non_attr_kind = decl->kind;
4954 decl = decl->declarator;
4961 if (first_non_attr_kind == cdk_attrs)
4962 first_non_attr_kind = decl->kind;
4971 gcc_assert (decl_context == PARM
4972 || decl_context == TYPENAME
4973 || (decl_context == FIELD
4974 && declarator->kind == cdk_id));
4975 gcc_assert (!initialized);
4979 /* A function definition's declarator must have the form of
4980 a function declarator. */
4982 if (funcdef_flag && !funcdef_syntax)
4985 /* If this looks like a function definition, make it one,
4986 even if it occurs where parms are expected.
4987 Then store_parm_decls will reject it and not use it as a parm. */
4988 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4989 decl_context = PARM;
4991 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4992 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
4994 if ((decl_context == NORMAL || decl_context == FIELD)
4995 && current_scope == file_scope
4996 && variably_modified_type_p (type, NULL_TREE))
4999 error_at (loc, "variably modified %qE at file scope", name);
5001 error_at (loc, "variably modified field at file scope");
5002 type = integer_type_node;
5005 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
5007 /* Diagnose defaulting to "int". */
5009 if (declspecs->default_int_p && !in_system_header)
5011 /* Issue a warning if this is an ISO C 99 program or if
5012 -Wreturn-type and this is a function, or if -Wimplicit;
5013 prefer the former warning since it is more explicit. */
5014 if ((warn_implicit_int || warn_return_type || flag_isoc99)
5016 warn_about_return_type = 1;
5020 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
5021 "type defaults to %<int%> in declaration of %qE",
5024 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
5025 "type defaults to %<int%> in type name");
5029 /* Adjust the type if a bit-field is being declared,
5030 -funsigned-bitfields applied and the type is not explicitly
5032 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
5033 && TREE_CODE (type) == INTEGER_TYPE)
5034 type = unsigned_type_for (type);
5036 /* Figure out the type qualifiers for the declaration. There are
5037 two ways a declaration can become qualified. One is something
5038 like `const int i' where the `const' is explicit. Another is
5039 something like `typedef const int CI; CI i' where the type of the
5040 declaration contains the `const'. A third possibility is that
5041 there is a type qualifier on the element type of a typedefed
5042 array type, in which case we should extract that qualifier so
5043 that c_apply_type_quals_to_decl receives the full list of
5044 qualifiers to work with (C90 is not entirely clear about whether
5045 duplicate qualifiers should be diagnosed in this case, but it
5046 seems most appropriate to do so). */
5047 element_type = strip_array_types (type);
5048 constp = declspecs->const_p + TYPE_READONLY (element_type);
5049 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
5050 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
5051 as1 = declspecs->address_space;
5052 as2 = TYPE_ADDR_SPACE (element_type);
5053 address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
5055 if (pedantic && !flag_isoc99)
5058 pedwarn (loc, OPT_pedantic, "duplicate %<const%>");
5060 pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>");
5062 pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>");
5065 if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
5066 error_at (loc, "conflicting named address spaces (%s vs %s)",
5067 c_addr_space_name (as1), c_addr_space_name (as2));
5069 if ((TREE_CODE (type) == ARRAY_TYPE
5070 || first_non_attr_kind == cdk_array)
5071 && TYPE_QUALS (element_type))
5072 type = TYPE_MAIN_VARIANT (type);
5073 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5074 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5075 | (volatilep ? TYPE_QUAL_VOLATILE : 0)
5076 | ENCODE_QUAL_ADDR_SPACE (address_space));
5078 /* Warn about storage classes that are invalid for certain
5079 kinds of declarations (parameters, typenames, etc.). */
5083 || storage_class == csc_auto
5084 || storage_class == csc_register
5085 || storage_class == csc_typedef))
5087 if (storage_class == csc_auto)
5089 (current_scope == file_scope) ? 0 : OPT_pedantic,
5090 "function definition declared %<auto%>");
5091 if (storage_class == csc_register)
5092 error_at (loc, "function definition declared %<register%>");
5093 if (storage_class == csc_typedef)
5094 error_at (loc, "function definition declared %<typedef%>");
5096 error_at (loc, "function definition declared %<__thread%>");
5098 if (storage_class == csc_auto
5099 || storage_class == csc_register
5100 || storage_class == csc_typedef)
5101 storage_class = csc_none;
5103 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
5105 if (decl_context == PARM && storage_class == csc_register)
5109 switch (decl_context)
5113 error_at (loc, "storage class specified for structure "
5116 error_at (loc, "storage class specified for structure field");
5120 error_at (loc, "storage class specified for parameter %qE",
5123 error_at (loc, "storage class specified for unnamed parameter");
5126 error_at (loc, "storage class specified for typename");
5129 storage_class = csc_none;
5133 else if (storage_class == csc_extern
5137 /* 'extern' with initialization is invalid if not at file scope. */
5138 if (current_scope == file_scope)
5140 /* It is fine to have 'extern const' when compiling at C
5141 and C++ intersection. */
5142 if (!(warn_cxx_compat && constp))
5143 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
5147 error_at (loc, "%qE has both %<extern%> and initializer", name);
5149 else if (current_scope == file_scope)
5151 if (storage_class == csc_auto)
5152 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
5154 if (pedantic && storage_class == csc_register)
5155 pedwarn (input_location, OPT_pedantic,
5156 "file-scope declaration of %qE specifies %<register%>", name);
5160 if (storage_class == csc_extern && funcdef_flag)
5161 error_at (loc, "nested function %qE declared %<extern%>", name);
5162 else if (threadp && storage_class == csc_none)
5164 error_at (loc, "function-scope %qE implicitly auto and declared "
5171 /* Now figure out the structure of the declarator proper.
5172 Descend through it, creating more complex types, until we reach
5173 the declared identifier (or NULL_TREE, in an absolute declarator).
5174 At each stage we maintain an unqualified version of the type
5175 together with any qualifiers that should be applied to it with
5176 c_build_qualified_type; this way, array types including
5177 multidimensional array types are first built up in unqualified
5178 form and then the qualified form is created with
5179 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5181 while (declarator && declarator->kind != cdk_id)
5183 if (type == error_mark_node)
5185 declarator = declarator->declarator;
5189 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5190 a cdk_pointer (for *...),
5191 a cdk_function (for ...(...)),
5192 a cdk_attrs (for nested attributes),
5193 or a cdk_id (for the name being declared
5194 or the place in an absolute declarator
5195 where the name was omitted).
5196 For the last case, we have just exited the loop.
5198 At this point, TYPE is the type of elements of an array,
5199 or for a function to return, or for a pointer to point to.
5200 After this sequence of ifs, TYPE is the type of the
5201 array or function or pointer, and DECLARATOR has had its
5202 outermost layer removed. */
5204 if (array_ptr_quals != TYPE_UNQUALIFIED
5205 || array_ptr_attrs != NULL_TREE
5206 || array_parm_static)
5208 /* Only the innermost declarator (making a parameter be of
5209 array type which is converted to pointer type)
5210 may have static or type qualifiers. */
5211 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5212 array_ptr_quals = TYPE_UNQUALIFIED;
5213 array_ptr_attrs = NULL_TREE;
5214 array_parm_static = 0;
5217 switch (declarator->kind)
5221 /* A declarator with embedded attributes. */
5222 tree attrs = declarator->u.attrs;
5223 const struct c_declarator *inner_decl;
5225 declarator = declarator->declarator;
5226 inner_decl = declarator;
5227 while (inner_decl->kind == cdk_attrs)
5228 inner_decl = inner_decl->declarator;
5229 if (inner_decl->kind == cdk_id)
5230 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5231 else if (inner_decl->kind == cdk_function)
5232 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5233 else if (inner_decl->kind == cdk_array)
5234 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5235 returned_attrs = decl_attributes (&type,
5236 chainon (returned_attrs, attrs),
5242 tree itype = NULL_TREE;
5243 tree size = declarator->u.array.dimen;
5244 /* The index is a signed object `sizetype' bits wide. */
5245 tree index_type = c_common_signed_type (sizetype);
5247 array_ptr_quals = declarator->u.array.quals;
5248 array_ptr_attrs = declarator->u.array.attrs;
5249 array_parm_static = declarator->u.array.static_p;
5250 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5252 declarator = declarator->declarator;
5254 /* Check for some types that there cannot be arrays of. */
5256 if (VOID_TYPE_P (type))
5259 error_at (loc, "declaration of %qE as array of voids", name);
5261 error_at (loc, "declaration of type name as array of voids");
5262 type = error_mark_node;
5265 if (TREE_CODE (type) == FUNCTION_TYPE)
5268 error_at (loc, "declaration of %qE as array of functions",
5271 error_at (loc, "declaration of type name as array of "
5273 type = error_mark_node;
5276 if (pedantic && !in_system_header && flexible_array_type_p (type))
5277 pedwarn (loc, OPT_pedantic,
5278 "invalid use of structure with flexible array member");
5280 if (size == error_mark_node)
5281 type = error_mark_node;
5283 if (type == error_mark_node)
5286 /* If size was specified, set ITYPE to a range-type for
5287 that size. Otherwise, ITYPE remains null. finish_decl
5288 may figure it out from an initial value. */
5292 bool size_maybe_const = true;
5293 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5294 && !TREE_OVERFLOW (size));
5295 bool this_size_varies = false;
5297 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5299 STRIP_TYPE_NOPS (size);
5301 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5304 error_at (loc, "size of array %qE has non-integer type",
5308 "size of unnamed array has non-integer type");
5309 size = integer_one_node;
5312 size = c_fully_fold (size, false, &size_maybe_const);
5314 if (pedantic && size_maybe_const && integer_zerop (size))
5317 pedwarn (loc, OPT_pedantic,
5318 "ISO C forbids zero-size array %qE", name);
5320 pedwarn (loc, OPT_pedantic,
5321 "ISO C forbids zero-size array");
5324 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5326 constant_expression_warning (size);
5327 if (tree_int_cst_sgn (size) < 0)
5330 error_at (loc, "size of array %qE is negative", name);
5332 error_at (loc, "size of unnamed array is negative");
5333 size = integer_one_node;
5335 /* Handle a size folded to an integer constant but
5336 not an integer constant expression. */
5337 if (!size_int_const)
5339 /* If this is a file scope declaration of an
5340 ordinary identifier, this is invalid code;
5341 diagnosing it here and not subsequently
5342 treating the type as variable-length avoids
5343 more confusing diagnostics later. */
5344 if ((decl_context == NORMAL || decl_context == FIELD)
5345 && current_scope == file_scope)
5346 pedwarn (input_location, 0,
5347 "variably modified %qE at file scope",
5350 this_size_varies = size_varies = true;
5351 warn_variable_length_array (name, size);
5354 else if ((decl_context == NORMAL || decl_context == FIELD)
5355 && current_scope == file_scope)
5357 error_at (loc, "variably modified %qE at file scope", name);
5358 size = integer_one_node;
5362 /* Make sure the array size remains visibly
5363 nonconstant even if it is (eg) a const variable
5364 with known value. */
5365 this_size_varies = size_varies = true;
5366 warn_variable_length_array (name, size);
5369 if (integer_zerop (size) && !this_size_varies)
5371 /* A zero-length array cannot be represented with
5372 an unsigned index type, which is what we'll
5373 get with build_index_type. Create an
5374 open-ended range instead. */
5375 itype = build_range_type (sizetype, size, NULL_TREE);
5379 /* Arrange for the SAVE_EXPR on the inside of the
5380 MINUS_EXPR, which allows the -1 to get folded
5381 with the +1 that happens when building TYPE_SIZE. */
5383 size = save_expr (size);
5384 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5385 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5386 integer_zero_node, size);
5388 /* Compute the maximum valid index, that is, size
5389 - 1. Do the calculation in index_type, so that
5390 if it is a variable the computations will be
5391 done in the proper mode. */
5392 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5393 convert (index_type, size),
5394 convert (index_type,
5397 /* The above overflows when size does not fit
5399 ??? While a size of INT_MAX+1 technically shouldn't
5400 cause an overflow (because we subtract 1), handling
5401 this case seems like an unnecessary complication. */
5402 if (TREE_CODE (size) == INTEGER_CST
5403 && !int_fits_type_p (size, index_type))
5406 error_at (loc, "size of array %qE is too large",
5409 error_at (loc, "size of unnamed array is too large");
5410 type = error_mark_node;
5414 itype = build_index_type (itype);
5416 if (this_size_varies)
5419 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5423 *expr_const_operands &= size_maybe_const;
5426 else if (decl_context == FIELD)
5428 bool flexible_array_member = false;
5429 if (array_parm_vla_unspec_p)
5430 /* Field names can in fact have function prototype
5431 scope so [*] is disallowed here through making
5432 the field variably modified, not through being
5433 something other than a declaration with function
5438 const struct c_declarator *t = declarator;
5439 while (t->kind == cdk_attrs)
5441 flexible_array_member = (t->kind == cdk_id);
5443 if (flexible_array_member
5444 && pedantic && !flag_isoc99 && !in_system_header)
5445 pedwarn (loc, OPT_pedantic,
5446 "ISO C90 does not support flexible array members");
5448 /* ISO C99 Flexible array members are effectively
5449 identical to GCC's zero-length array extension. */
5450 if (flexible_array_member || array_parm_vla_unspec_p)
5451 itype = build_range_type (sizetype, size_zero_node,
5454 else if (decl_context == PARM)
5456 if (array_parm_vla_unspec_p)
5458 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5462 else if (decl_context == TYPENAME)
5464 if (array_parm_vla_unspec_p)
5467 warning (0, "%<[*]%> not in a declaration");
5468 /* We use this to avoid messing up with incomplete
5469 array types of the same type, that would
5470 otherwise be modified below. */
5471 itype = build_range_type (sizetype, size_zero_node,
5477 /* Complain about arrays of incomplete types. */
5478 if (!COMPLETE_TYPE_P (type))
5480 error_at (loc, "array type has incomplete element type");
5481 type = error_mark_node;
5484 /* When itype is NULL, a shared incomplete array type is
5485 returned for all array of a given type. Elsewhere we
5486 make sure we don't complete that type before copying
5487 it, but here we want to make sure we don't ever
5488 modify the shared type, so we gcc_assert (itype)
5491 addr_space_t as = DECODE_QUAL_ADDR_SPACE (type_quals);
5492 if (!ADDR_SPACE_GENERIC_P (as) && as != TYPE_ADDR_SPACE (type))
5493 type = build_qualified_type (type,
5494 ENCODE_QUAL_ADDR_SPACE (as));
5496 type = build_array_type (type, itype);
5499 if (type != error_mark_node)
5503 /* It is ok to modify type here even if itype is
5504 NULL: if size_varies, we're in a
5505 multi-dimensional array and the inner type has
5506 variable size, so the enclosing shared array type
5508 if (size && TREE_CODE (size) == INTEGER_CST)
5510 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5511 C_TYPE_VARIABLE_SIZE (type) = 1;
5514 /* The GCC extension for zero-length arrays differs from
5515 ISO flexible array members in that sizeof yields
5517 if (size && integer_zerop (size))
5520 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5521 TYPE_SIZE (type) = bitsize_zero_node;
5522 TYPE_SIZE_UNIT (type) = size_zero_node;
5523 SET_TYPE_STRUCTURAL_EQUALITY (type);
5525 if (array_parm_vla_unspec_p)
5528 /* The type is complete. C99 6.7.5.2p4 */
5529 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5530 TYPE_SIZE (type) = bitsize_zero_node;
5531 TYPE_SIZE_UNIT (type) = size_zero_node;
5532 SET_TYPE_STRUCTURAL_EQUALITY (type);
5536 if (decl_context != PARM
5537 && (array_ptr_quals != TYPE_UNQUALIFIED
5538 || array_ptr_attrs != NULL_TREE
5539 || array_parm_static))
5541 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5542 array_ptr_quals = TYPE_UNQUALIFIED;
5543 array_ptr_attrs = NULL_TREE;
5544 array_parm_static = 0;
5550 /* Say it's a definition only for the declarator closest
5551 to the identifier, apart possibly from some
5553 bool really_funcdef = false;
5557 const struct c_declarator *t = declarator->declarator;
5558 while (t->kind == cdk_attrs)
5560 really_funcdef = (t->kind == cdk_id);
5563 /* Declaring a function type. Make sure we have a valid
5564 type for the function to return. */
5565 if (type == error_mark_node)
5568 size_varies = false;
5570 /* Warn about some types functions can't return. */
5571 if (TREE_CODE (type) == FUNCTION_TYPE)
5574 error_at (loc, "%qE declared as function returning a "
5577 error_at (loc, "type name declared as function "
5578 "returning a function");
5579 type = integer_type_node;
5581 if (TREE_CODE (type) == ARRAY_TYPE)
5584 error_at (loc, "%qE declared as function returning an array",
5587 error_at (loc, "type name declared as function returning "
5589 type = integer_type_node;
5591 errmsg = targetm.invalid_return_type (type);
5595 type = integer_type_node;
5598 /* Construct the function type and go to the next
5599 inner layer of declarator. */
5600 arg_info = declarator->u.arg_info;
5601 arg_types = grokparms (arg_info, really_funcdef);
5603 /* Type qualifiers before the return type of the function
5604 qualify the return type, not the function type. */
5607 /* Type qualifiers on a function return type are
5608 normally permitted by the standard but have no
5609 effect, so give a warning at -Wreturn-type.
5610 Qualifiers on a void return type are banned on
5611 function definitions in ISO C; GCC used to used
5612 them for noreturn functions. */
5613 if (VOID_TYPE_P (type) && really_funcdef)
5615 "function definition has qualified void return type");
5617 warning_at (loc, OPT_Wignored_qualifiers,
5618 "type qualifiers ignored on function return type");
5620 type = c_build_qualified_type (type, type_quals);
5622 type_quals = TYPE_UNQUALIFIED;
5624 type = build_function_type (type, arg_types);
5625 declarator = declarator->declarator;
5627 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5628 the formal parameter list of this FUNCTION_TYPE to point to
5629 the FUNCTION_TYPE node itself. */
5634 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag, arg_info->tags, ix, tag)
5635 TYPE_CONTEXT (tag->type) = type;
5641 /* Merge any constancy or volatility into the target type
5644 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5646 pedwarn (loc, OPT_pedantic,
5647 "ISO C forbids qualified function types");
5649 type = c_build_qualified_type (type, type_quals);
5650 size_varies = false;
5652 /* When the pointed-to type involves components of variable size,
5653 care must be taken to ensure that the size evaluation code is
5654 emitted early enough to dominate all the possible later uses
5655 and late enough for the variables on which it depends to have
5658 This is expected to happen automatically when the pointed-to
5659 type has a name/declaration of it's own, but special attention
5660 is required if the type is anonymous.
5662 We handle the NORMAL and FIELD contexts here by attaching an
5663 artificial TYPE_DECL to such pointed-to type. This forces the
5664 sizes evaluation at a safe point and ensures it is not deferred
5665 until e.g. within a deeper conditional context.
5667 We expect nothing to be needed here for PARM or TYPENAME.
5668 Pushing a TYPE_DECL at this point for TYPENAME would actually
5669 be incorrect, as we might be in the middle of an expression
5670 with side effects on the pointed-to type size "arguments" prior
5671 to the pointer declaration point and the fake TYPE_DECL in the
5672 enclosing context would force the size evaluation prior to the
5675 if (!TYPE_NAME (type)
5676 && (decl_context == NORMAL || decl_context == FIELD)
5677 && variably_modified_type_p (type, NULL_TREE))
5679 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5680 DECL_ARTIFICIAL (decl) = 1;
5682 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5683 TYPE_NAME (type) = decl;
5686 type = build_pointer_type (type);
5688 /* Process type qualifiers (such as const or volatile)
5689 that were given inside the `*'. */
5690 type_quals = declarator->u.pointer_quals;
5692 declarator = declarator->declarator;
5699 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5701 /* Now TYPE has the actual type, apart from any qualifiers in
5704 /* Warn about address space used for things other than static memory or
5706 address_space = DECODE_QUAL_ADDR_SPACE (type_quals);
5707 if (!ADDR_SPACE_GENERIC_P (address_space))
5709 if (decl_context == NORMAL)
5711 switch (storage_class)
5714 error ("%qs combined with %<auto%> qualifier for %qE",
5715 c_addr_space_name (address_space), name);
5718 error ("%qs combined with %<register%> qualifier for %qE",
5719 c_addr_space_name (address_space), name);
5722 if (current_function_scope)
5724 error ("%qs specified for auto variable %qE",
5725 c_addr_space_name (address_space), name);
5737 else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE)
5740 error ("%qs specified for parameter %qE",
5741 c_addr_space_name (address_space), name);
5743 error ("%qs specified for unnamed parameter",
5744 c_addr_space_name (address_space));
5746 else if (decl_context == FIELD)
5749 error ("%qs specified for structure field %qE",
5750 c_addr_space_name (address_space), name);
5752 error ("%qs specified for structure field",
5753 c_addr_space_name (address_space));
5757 /* Check the type and width of a bit-field. */
5759 check_bitfield_type_and_width (&type, width, name);
5761 /* Reject invalid uses of _Alignas. */
5762 if (declspecs->alignas_p)
5764 if (storage_class == csc_typedef)
5765 error_at (loc, "alignment specified for typedef %qE", name);
5766 else if (storage_class == csc_register)
5767 error_at (loc, "alignment specified for %<register%> object %qE",
5769 else if (decl_context == PARM)
5772 error_at (loc, "alignment specified for parameter %qE", name);
5774 error_at (loc, "alignment specified for unnamed parameter");
5779 error_at (loc, "alignment specified for bit-field %qE", name);
5781 error_at (loc, "alignment specified for unnamed bit-field");
5783 else if (TREE_CODE (type) == FUNCTION_TYPE)
5784 error_at (loc, "alignment specified for function %qE", name);
5785 else if (declspecs->align_log != -1)
5787 alignas_align = 1U << declspecs->align_log;
5788 if (alignas_align < TYPE_ALIGN_UNIT (type))
5791 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
5792 "alignment of %qE", name);
5794 error_at (loc, "%<_Alignas%> specifiers cannot reduce "
5795 "alignment of unnamed field");
5801 /* Did array size calculations overflow? */
5803 if (TREE_CODE (type) == ARRAY_TYPE
5804 && COMPLETE_TYPE_P (type)
5805 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5806 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
5809 error_at (loc, "size of array %qE is too large", name);
5811 error_at (loc, "size of unnamed array is too large");
5812 /* If we proceed with the array type as it is, we'll eventually
5813 crash in tree_low_cst(). */
5814 type = error_mark_node;
5817 /* If this is declaring a typedef name, return a TYPE_DECL. */
5819 if (storage_class == csc_typedef)
5822 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5824 pedwarn (loc, OPT_pedantic,
5825 "ISO C forbids qualified function types");
5827 type = c_build_qualified_type (type, type_quals);
5828 decl = build_decl (declarator->id_loc,
5829 TYPE_DECL, declarator->u.id, type);
5830 if (declspecs->explicit_signed_p)
5831 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5832 if (declspecs->inline_p)
5833 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
5834 if (declspecs->noreturn_p)
5835 pedwarn (loc, 0,"typedef %q+D declared %<_Noreturn%>", decl);
5837 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
5839 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
5842 && b->decl != NULL_TREE
5843 && (B_IN_CURRENT_SCOPE (b)
5844 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
5845 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
5847 warning_at (declarator->id_loc, OPT_Wc___compat,
5848 ("using %qD as both a typedef and a tag is "
5851 if (b->locus != UNKNOWN_LOCATION)
5852 inform (b->locus, "originally defined here");
5859 /* If this is a type name (such as, in a cast or sizeof),
5860 compute the type and return it now. */
5862 if (decl_context == TYPENAME)
5864 /* Note that the grammar rejects storage classes in typenames
5866 gcc_assert (storage_class == csc_none && !threadp
5867 && !declspecs->inline_p && !declspecs->noreturn_p);
5868 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5870 pedwarn (loc, OPT_pedantic,
5871 "ISO C forbids const or volatile function types");
5873 type = c_build_qualified_type (type, type_quals);
5877 if (pedantic && decl_context == FIELD
5878 && variably_modified_type_p (type, NULL_TREE))
5881 pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot "
5882 "have a variably modified type");
5885 /* Aside from typedefs and type names (handle above),
5886 `void' at top level (not within pointer)
5887 is allowed only in public variables.
5888 We don't complain about parms either, but that is because
5889 a better error message can be made later. */
5891 if (VOID_TYPE_P (type) && decl_context != PARM
5892 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5893 && (storage_class == csc_extern
5894 || (current_scope == file_scope
5895 && !(storage_class == csc_static
5896 || storage_class == csc_register)))))
5898 error_at (loc, "variable or field %qE declared void", name);
5899 type = integer_type_node;
5902 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5903 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5908 if (decl_context == PARM)
5912 /* A parameter declared as an array of T is really a pointer to T.
5913 One declared as a function is really a pointer to a function. */
5915 if (TREE_CODE (type) == ARRAY_TYPE)
5917 /* Transfer const-ness of array into that of type pointed to. */
5918 type = TREE_TYPE (type);
5920 type = c_build_qualified_type (type, type_quals);
5921 type = build_pointer_type (type);
5922 type_quals = array_ptr_quals;
5924 type = c_build_qualified_type (type, type_quals);
5926 /* We don't yet implement attributes in this context. */
5927 if (array_ptr_attrs != NULL_TREE)
5928 warning_at (loc, OPT_Wattributes,
5929 "attributes in parameter array declarator ignored");
5931 size_varies = false;
5933 else if (TREE_CODE (type) == FUNCTION_TYPE)
5936 pedwarn (loc, OPT_pedantic,
5937 "ISO C forbids qualified function types");
5939 type = c_build_qualified_type (type, type_quals);
5940 type = build_pointer_type (type);
5941 type_quals = TYPE_UNQUALIFIED;
5943 else if (type_quals)
5944 type = c_build_qualified_type (type, type_quals);
5946 decl = build_decl (declarator->id_loc,
5947 PARM_DECL, declarator->u.id, type);
5949 C_DECL_VARIABLE_SIZE (decl) = 1;
5951 /* Compute the type actually passed in the parmlist,
5952 for the case where there is no prototype.
5953 (For example, shorts and chars are passed as ints.)
5954 When there is a prototype, this is overridden later. */
5956 if (type == error_mark_node)
5957 promoted_type = type;
5959 promoted_type = c_type_promotes_to (type);
5961 DECL_ARG_TYPE (decl) = promoted_type;
5962 if (declspecs->inline_p)
5963 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
5964 if (declspecs->noreturn_p)
5965 pedwarn (loc, 0, "parameter %q+D declared %<_Noreturn%>", decl);
5967 else if (decl_context == FIELD)
5969 /* Note that the grammar rejects storage classes in typenames
5971 gcc_assert (storage_class == csc_none && !threadp
5972 && !declspecs->inline_p && !declspecs->noreturn_p);
5974 /* Structure field. It may not be a function. */
5976 if (TREE_CODE (type) == FUNCTION_TYPE)
5978 error_at (loc, "field %qE declared as a function", name);
5979 type = build_pointer_type (type);
5981 else if (TREE_CODE (type) != ERROR_MARK
5982 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
5985 error_at (loc, "field %qE has incomplete type", name);
5987 error_at (loc, "unnamed field has incomplete type");
5988 type = error_mark_node;
5990 type = c_build_qualified_type (type, type_quals);
5991 decl = build_decl (declarator->id_loc,
5992 FIELD_DECL, declarator->u.id, type);
5993 DECL_NONADDRESSABLE_P (decl) = bitfield;
5994 if (bitfield && !declarator->u.id)
5995 TREE_NO_WARNING (decl) = 1;
5998 C_DECL_VARIABLE_SIZE (decl) = 1;
6000 else if (TREE_CODE (type) == FUNCTION_TYPE)
6002 if (storage_class == csc_register || threadp)
6004 error_at (loc, "invalid storage class for function %qE", name);
6006 else if (current_scope != file_scope)
6008 /* Function declaration not at file scope. Storage
6009 classes other than `extern' are not allowed, C99
6010 6.7.1p5, and `extern' makes no difference. However,
6011 GCC allows 'auto', perhaps with 'inline', to support
6012 nested functions. */
6013 if (storage_class == csc_auto)
6014 pedwarn (loc, OPT_pedantic,
6015 "invalid storage class for function %qE", name);
6016 else if (storage_class == csc_static)
6018 error_at (loc, "invalid storage class for function %qE", name);
6020 storage_class = declspecs->storage_class = csc_none;
6026 decl = build_decl (declarator->id_loc,
6027 FUNCTION_DECL, declarator->u.id, type);
6028 decl = build_decl_attribute_variant (decl, decl_attr);
6030 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
6031 pedwarn (loc, OPT_pedantic,
6032 "ISO C forbids qualified function types");
6034 /* Every function declaration is an external reference
6035 (DECL_EXTERNAL) except for those which are not at file
6036 scope and are explicitly declared "auto". This is
6037 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6038 GCC to signify a forward declaration of a nested function. */
6039 if (storage_class == csc_auto && current_scope != file_scope)
6040 DECL_EXTERNAL (decl) = 0;
6041 /* In C99, a function which is declared 'inline' with 'extern'
6042 is not an external reference (which is confusing). It
6043 means that the later definition of the function must be output
6044 in this file, C99 6.7.4p6. In GNU C89, a function declared
6045 'extern inline' is an external reference. */
6046 else if (declspecs->inline_p && storage_class != csc_static)
6047 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
6048 == flag_gnu89_inline);
6050 DECL_EXTERNAL (decl) = !initialized;
6052 /* Record absence of global scope for `static' or `auto'. */
6054 = !(storage_class == csc_static || storage_class == csc_auto);
6056 /* For a function definition, record the argument information
6057 block where store_parm_decls will look for it. */
6059 current_function_arg_info = arg_info;
6061 if (declspecs->default_int_p)
6062 C_FUNCTION_IMPLICIT_INT (decl) = 1;
6064 /* Record presence of `inline' and `_Noreturn', if it is
6066 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
6068 if (declspecs->inline_p)
6069 pedwarn (loc, 0, "cannot inline function %<main%>");
6070 if (declspecs->noreturn_p)
6071 pedwarn (loc, 0, "%<main%> declared %<_Noreturn%>");
6075 if (declspecs->inline_p)
6076 /* Record that the function is declared `inline'. */
6077 DECL_DECLARED_INLINE_P (decl) = 1;
6078 if (declspecs->noreturn_p)
6083 pedwarn (loc, OPT_pedantic,
6084 "ISO C99 does not support %<_Noreturn%>");
6086 pedwarn (loc, OPT_pedantic,
6087 "ISO C90 does not support %<_Noreturn%>");
6089 TREE_THIS_VOLATILE (decl) = 1;
6095 /* It's a variable. */
6096 /* An uninitialized decl with `extern' is a reference. */
6097 int extern_ref = !initialized && storage_class == csc_extern;
6099 type = c_build_qualified_type (type, type_quals);
6101 /* C99 6.2.2p7: It is invalid (compile-time undefined
6102 behavior) to create an 'extern' declaration for a
6103 variable if there is a global declaration that is
6104 'static' and the global declaration is not visible.
6105 (If the static declaration _is_ currently visible,
6106 the 'extern' declaration is taken to refer to that decl.) */
6107 if (extern_ref && current_scope != file_scope)
6109 tree global_decl = identifier_global_value (declarator->u.id);
6110 tree visible_decl = lookup_name (declarator->u.id);
6113 && global_decl != visible_decl
6114 && TREE_CODE (global_decl) == VAR_DECL
6115 && !TREE_PUBLIC (global_decl))
6116 error_at (loc, "variable previously declared %<static%> "
6117 "redeclared %<extern%>");
6120 decl = build_decl (declarator->id_loc,
6121 VAR_DECL, declarator->u.id, type);
6123 C_DECL_VARIABLE_SIZE (decl) = 1;
6125 if (declspecs->inline_p)
6126 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
6127 if (declspecs->noreturn_p)
6128 pedwarn (loc, 0, "variable %q+D declared %<_Noreturn%>", decl);
6130 /* At file scope, an initialized extern declaration may follow
6131 a static declaration. In that case, DECL_EXTERNAL will be
6132 reset later in start_decl. */
6133 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
6135 /* At file scope, the presence of a `static' or `register' storage
6136 class specifier, or the absence of all storage class specifiers
6137 makes this declaration a definition (perhaps tentative). Also,
6138 the absence of `static' makes it public. */
6139 if (current_scope == file_scope)
6141 TREE_PUBLIC (decl) = storage_class != csc_static;
6142 TREE_STATIC (decl) = !extern_ref;
6144 /* Not at file scope, only `static' makes a static definition. */
6147 TREE_STATIC (decl) = (storage_class == csc_static);
6148 TREE_PUBLIC (decl) = extern_ref;
6152 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6155 if ((storage_class == csc_extern
6156 || (storage_class == csc_none
6157 && TREE_CODE (type) == FUNCTION_TYPE
6159 && variably_modified_type_p (type, NULL_TREE))
6162 if (TREE_CODE (type) == FUNCTION_TYPE)
6163 error_at (loc, "non-nested function with variably modified type");
6165 error_at (loc, "object with variably modified type must have "
6169 /* Record `register' declaration for warnings on &
6170 and in case doing stupid register allocation. */
6172 if (storage_class == csc_register)
6174 C_DECL_REGISTER (decl) = 1;
6175 DECL_REGISTER (decl) = 1;
6178 /* Record constancy and volatility. */
6179 c_apply_type_quals_to_decl (type_quals, decl);
6181 /* Apply _Alignas specifiers. */
6184 DECL_ALIGN (decl) = alignas_align * BITS_PER_UNIT;
6185 DECL_USER_ALIGN (decl) = 1;
6188 /* If a type has volatile components, it should be stored in memory.
6189 Otherwise, the fact that those components are volatile
6190 will be ignored, and would even crash the compiler.
6191 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6192 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
6193 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
6194 || TREE_CODE (decl) == RESULT_DECL))
6196 /* It is not an error for a structure with volatile fields to
6197 be declared register, but reset DECL_REGISTER since it
6198 cannot actually go in a register. */
6199 int was_reg = C_DECL_REGISTER (decl);
6200 C_DECL_REGISTER (decl) = 0;
6201 DECL_REGISTER (decl) = 0;
6202 c_mark_addressable (decl);
6203 C_DECL_REGISTER (decl) = was_reg;
6206 /* This is the earliest point at which we might know the assembler
6207 name of a variable. Thus, if it's known before this, die horribly. */
6208 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
6211 && TREE_CODE (decl) == VAR_DECL
6212 && TREE_PUBLIC (decl)
6213 && TREE_STATIC (decl)
6214 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
6215 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
6216 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
6217 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
6218 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
6219 ("non-local variable %qD with anonymous type is "
6220 "questionable in C++"),
6227 /* Decode the parameter-list info for a function type or function definition.
6228 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6229 if there is an identifier list instead of a parameter decl list).
6230 These two functions are separate because when a function returns
6231 or receives functions then each is called multiple times but the order
6232 of calls is different. The last call to `grokparms' is always the one
6233 that contains the formal parameter names of a function definition.
6235 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6237 FUNCDEF_FLAG is true for a function definition, false for
6238 a mere declaration. A nonempty identifier-list gets an error message
6239 when FUNCDEF_FLAG is false. */
6242 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
6244 tree arg_types = arg_info->types;
6246 if (funcdef_flag && arg_info->had_vla_unspec)
6248 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6250 error ("%<[*]%> not allowed in other than function prototype scope");
6253 if (arg_types == 0 && !funcdef_flag && !in_system_header)
6254 warning (OPT_Wstrict_prototypes,
6255 "function declaration isn%'t a prototype");
6257 if (arg_types == error_mark_node)
6258 return 0; /* don't set TYPE_ARG_TYPES in this case */
6260 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
6264 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
6265 arg_info->parms = NULL_TREE;
6268 arg_info->parms = arg_info->types;
6270 arg_info->types = 0;
6275 tree parm, type, typelt;
6276 unsigned int parmno;
6279 /* If there is a parameter of incomplete type in a definition,
6280 this is an error. In a declaration this is valid, and a
6281 struct or union type may be completed later, before any calls
6282 or definition of the function. In the case where the tag was
6283 first declared within the parameter list, a warning has
6284 already been given. If a parameter has void type, then
6285 however the function cannot be defined or called, so
6288 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
6290 parm = DECL_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
6292 type = TREE_VALUE (typelt);
6293 if (type == error_mark_node)
6296 if (!COMPLETE_TYPE_P (type))
6300 if (DECL_NAME (parm))
6301 error_at (input_location,
6302 "parameter %u (%q+D) has incomplete type",
6305 error_at (DECL_SOURCE_LOCATION (parm),
6306 "parameter %u has incomplete type",
6309 TREE_VALUE (typelt) = error_mark_node;
6310 TREE_TYPE (parm) = error_mark_node;
6311 arg_types = NULL_TREE;
6313 else if (VOID_TYPE_P (type))
6315 if (DECL_NAME (parm))
6316 warning_at (input_location, 0,
6317 "parameter %u (%q+D) has void type",
6320 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6321 "parameter %u has void type",
6326 errmsg = targetm.invalid_parameter_type (type);
6330 TREE_VALUE (typelt) = error_mark_node;
6331 TREE_TYPE (parm) = error_mark_node;
6332 arg_types = NULL_TREE;
6335 if (DECL_NAME (parm) && TREE_USED (parm))
6336 warn_if_shadowing (parm);
6342 /* Allocate and initialize a c_arg_info structure from the parser's
6346 build_arg_info (void)
6348 struct c_arg_info *ret = XOBNEW (&parser_obstack, struct c_arg_info);
6349 ret->parms = NULL_TREE;
6351 ret->types = NULL_TREE;
6352 ret->others = NULL_TREE;
6353 ret->pending_sizes = NULL;
6354 ret->had_vla_unspec = 0;
6358 /* Take apart the current scope and return a c_arg_info structure with
6359 info on a parameter list just parsed.
6361 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6363 ELLIPSIS being true means the argument list ended in '...' so don't
6364 append a sentinel (void_list_node) to the end of the type-list.
6366 EXPR is NULL or an expression that needs to be evaluated for the
6367 side effects of array size expressions in the parameters. */
6370 get_parm_info (bool ellipsis, tree expr)
6372 struct c_binding *b = current_scope->bindings;
6373 struct c_arg_info *arg_info = build_arg_info ();
6376 VEC(c_arg_tag,gc) *tags = NULL;
6380 static bool explained_incomplete_types = false;
6381 bool gave_void_only_once_err = false;
6383 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6385 /* The bindings in this scope must not get put into a block.
6386 We will take care of deleting the binding nodes. */
6387 current_scope->bindings = 0;
6389 /* This function is only called if there was *something* on the
6393 /* A parameter list consisting solely of 'void' indicates that the
6394 function takes no arguments. But if the 'void' is qualified
6395 (by 'const' or 'volatile'), or has a storage class specifier
6396 ('register'), then the behavior is undefined; issue an error.
6397 Typedefs for 'void' are OK (see DR#157). */
6398 if (b->prev == 0 /* one binding */
6399 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6400 && !DECL_NAME (b->decl) /* anonymous */
6401 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6403 if (TREE_THIS_VOLATILE (b->decl)
6404 || TREE_READONLY (b->decl)
6405 || C_DECL_REGISTER (b->decl))
6406 error ("%<void%> as only parameter may not be qualified");
6408 /* There cannot be an ellipsis. */
6410 error ("%<void%> must be the only parameter");
6412 arg_info->types = void_list_node;
6417 types = void_list_node;
6419 /* Break up the bindings list into parms, tags, types, and others;
6420 apply sanity checks; purge the name-to-decl bindings. */
6423 tree decl = b->decl;
6424 tree type = TREE_TYPE (decl);
6426 const char *keyword;
6428 switch (TREE_CODE (decl))
6433 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6434 I_SYMBOL_BINDING (b->id) = b->shadowed;
6437 /* Check for forward decls that never got their actual decl. */
6438 if (TREE_ASM_WRITTEN (decl))
6439 error ("parameter %q+D has just a forward declaration", decl);
6440 /* Check for (..., void, ...) and issue an error. */
6441 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6443 if (!gave_void_only_once_err)
6445 error ("%<void%> must be the only parameter");
6446 gave_void_only_once_err = true;
6451 /* Valid parameter, add it to the list. */
6452 DECL_CHAIN (decl) = parms;
6455 /* Since there is a prototype, args are passed in their
6456 declared types. The back end may override this later. */
6457 DECL_ARG_TYPE (decl) = type;
6458 types = tree_cons (0, type, types);
6462 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6463 case UNION_TYPE: keyword = "union"; goto tag;
6464 case RECORD_TYPE: keyword = "struct"; goto tag;
6466 /* Types may not have tag-names, in which case the type
6467 appears in the bindings list with b->id NULL. */
6470 gcc_assert (I_TAG_BINDING (b->id) == b);
6471 I_TAG_BINDING (b->id) = b->shadowed;
6474 /* Warn about any struct, union or enum tags defined in a
6475 parameter list. The scope of such types is limited to
6476 the parameter list, which is rarely if ever desirable
6477 (it's impossible to call such a function with type-
6478 correct arguments). An anonymous union parm type is
6479 meaningful as a GNU extension, so don't warn for that. */
6480 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6483 /* The %s will be one of 'struct', 'union', or 'enum'. */
6484 warning (0, "%<%s %E%> declared inside parameter list",
6487 /* The %s will be one of 'struct', 'union', or 'enum'. */
6488 warning (0, "anonymous %s declared inside parameter list",
6491 if (!explained_incomplete_types)
6493 warning (0, "its scope is only this definition or declaration,"
6494 " which is probably not what you want");
6495 explained_incomplete_types = true;
6499 tag = VEC_safe_push (c_arg_tag, gc, tags, NULL);
6507 /* CONST_DECLs appear here when we have an embedded enum,
6508 and TYPE_DECLs appear here when we have an embedded struct
6509 or union. No warnings for this - we already warned about the
6510 type itself. FUNCTION_DECLs appear when there is an implicit
6511 function declaration in the parameter list. */
6513 /* When we reinsert this decl in the function body, we need
6514 to reconstruct whether it was marked as nested. */
6515 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6518 DECL_CHAIN (decl) = others;
6523 /* error_mark_node appears here when we have an undeclared
6524 variable. Just throw it away. */
6527 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6528 I_SYMBOL_BINDING (b->id) = b->shadowed;
6532 /* Other things that might be encountered. */
6539 b = free_binding_and_advance (b);
6542 arg_info->parms = parms;
6543 arg_info->tags = tags;
6544 arg_info->types = types;
6545 arg_info->others = others;
6546 arg_info->pending_sizes = expr;
6550 /* Get the struct, enum or union (CODE says which) with tag NAME.
6551 Define the tag as a forward-reference with location LOC if it is
6552 not defined. Return a c_typespec structure for the type
6556 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6558 struct c_typespec ret;
6562 ret.expr = NULL_TREE;
6563 ret.expr_const_operands = true;
6565 /* If a cross reference is requested, look up the type
6566 already defined for this tag and return it. */
6568 ref = lookup_tag (code, name, 0, &refloc);
6569 /* If this is the right type of tag, return what we found.
6570 (This reference will be shadowed by shadow_tag later if appropriate.)
6571 If this is the wrong type of tag, do not return it. If it was the
6572 wrong type in the same scope, we will have had an error
6573 message already; if in a different scope and declaring
6574 a name, pending_xref_error will give an error message; but if in a
6575 different scope and not declaring a name, this tag should
6576 shadow the previous declaration of a different type of tag, and
6577 this would not work properly if we return the reference found.
6578 (For example, with "struct foo" in an outer scope, "union foo;"
6579 must shadow that tag with a new one of union type.) */
6580 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6581 if (ref && TREE_CODE (ref) == code)
6583 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6584 && loc != UNKNOWN_LOCATION
6590 warning_at (loc, OPT_Wc___compat,
6591 ("enum type defined in struct or union "
6592 "is not visible in C++"));
6593 inform (refloc, "enum type defined here");
6596 warning_at (loc, OPT_Wc___compat,
6597 ("struct defined in struct or union "
6598 "is not visible in C++"));
6599 inform (refloc, "struct defined here");
6602 warning_at (loc, OPT_Wc___compat,
6603 ("union defined in struct or union "
6604 "is not visible in C++"));
6605 inform (refloc, "union defined here");
6616 /* If no such tag is yet defined, create a forward-reference node
6617 and record it as the "definition".
6618 When a real declaration of this type is found,
6619 the forward-reference will be altered into a real type. */
6621 ref = make_node (code);
6622 if (code == ENUMERAL_TYPE)
6624 /* Give the type a default layout like unsigned int
6625 to avoid crashing if it does not get defined. */
6626 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6627 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6628 TYPE_USER_ALIGN (ref) = 0;
6629 TYPE_UNSIGNED (ref) = 1;
6630 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6631 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6632 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6635 pushtag (loc, name, ref);
6641 /* Get the struct, enum or union (CODE says which) with tag NAME.
6642 Define the tag as a forward-reference if it is not defined.
6643 Return a tree for the type. */
6646 xref_tag (enum tree_code code, tree name)
6648 return parser_xref_tag (input_location, code, name).spec;
6651 /* Make sure that the tag NAME is defined *in the current scope*
6652 at least as a forward reference.
6653 LOC is the location of the struct's definition.
6654 CODE says which kind of tag NAME ought to be.
6656 This stores the current value of the file static STRUCT_PARSE_INFO
6657 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6658 new c_struct_parse_info structure. The old value of
6659 STRUCT_PARSE_INFO is restored in finish_struct. */
6662 start_struct (location_t loc, enum tree_code code, tree name,
6663 struct c_struct_parse_info **enclosing_struct_parse_info)
6665 /* If there is already a tag defined at this scope
6666 (as a forward reference), just return it. */
6668 tree ref = NULL_TREE;
6669 location_t refloc = UNKNOWN_LOCATION;
6671 if (name != NULL_TREE)
6672 ref = lookup_tag (code, name, 1, &refloc);
6673 if (ref && TREE_CODE (ref) == code)
6675 if (TYPE_SIZE (ref))
6677 if (code == UNION_TYPE)
6678 error_at (loc, "redefinition of %<union %E%>", name);
6680 error_at (loc, "redefinition of %<struct %E%>", name);
6681 if (refloc != UNKNOWN_LOCATION)
6682 inform (refloc, "originally defined here");
6683 /* Don't create structures using a name already in use. */
6686 else if (C_TYPE_BEING_DEFINED (ref))
6688 if (code == UNION_TYPE)
6689 error_at (loc, "nested redefinition of %<union %E%>", name);
6691 error_at (loc, "nested redefinition of %<struct %E%>", name);
6692 /* Don't bother to report "originally defined here" for a
6693 nested redefinition; the original definition should be
6695 /* Don't create structures that contain themselves. */
6700 /* Otherwise create a forward-reference just so the tag is in scope. */
6702 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6704 ref = make_node (code);
6705 pushtag (loc, name, ref);
6708 C_TYPE_BEING_DEFINED (ref) = 1;
6709 TYPE_PACKED (ref) = flag_pack_struct;
6711 *enclosing_struct_parse_info = struct_parse_info;
6712 struct_parse_info = XNEW (struct c_struct_parse_info);
6713 struct_parse_info->struct_types = VEC_alloc (tree, heap, 0);
6714 struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0);
6715 struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0);
6717 /* FIXME: This will issue a warning for a use of a type defined
6718 within a statement expr used within sizeof, et. al. This is not
6719 terribly serious as C++ doesn't permit statement exprs within
6721 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6722 warning_at (loc, OPT_Wc___compat,
6723 "defining type in %qs expression is invalid in C++",
6726 : (in_typeof ? "typeof" : "alignof")));
6731 /* Process the specs, declarator and width (NULL if omitted)
6732 of a structure component, returning a FIELD_DECL node.
6733 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6734 DECL_ATTRS is as for grokdeclarator.
6736 LOC is the location of the structure component.
6738 This is done during the parsing of the struct declaration.
6739 The FIELD_DECL nodes are chained together and the lot of them
6740 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6743 grokfield (location_t loc,
6744 struct c_declarator *declarator, struct c_declspecs *declspecs,
6745 tree width, tree *decl_attrs)
6749 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6750 && width == NULL_TREE)
6752 /* This is an unnamed decl.
6754 If we have something of the form "union { list } ;" then this
6755 is the anonymous union extension. Similarly for struct.
6757 If this is something of the form "struct foo;", then
6758 If MS or Plan 9 extensions are enabled, this is handled as
6759 an anonymous struct.
6760 Otherwise this is a forward declaration of a structure tag.
6762 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6763 If foo names a structure or union without a tag, then this
6764 is an anonymous struct (this is permitted by C11).
6765 If MS or Plan 9 extensions are enabled and foo names a
6766 structure, then again this is an anonymous struct.
6767 Otherwise this is an error.
6769 Oh what a horrid tangled web we weave. I wonder if MS consciously
6770 took this from Plan 9 or if it was an accident of implementation
6771 that took root before someone noticed the bug... */
6773 tree type = declspecs->type;
6774 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6775 || TREE_CODE (type) == UNION_TYPE);
6779 && (flag_ms_extensions
6780 || flag_plan9_extensions
6781 || !declspecs->typedef_p))
6783 if (flag_ms_extensions || flag_plan9_extensions)
6785 else if (TYPE_NAME (type) == NULL)
6792 pedwarn (loc, 0, "declaration does not declare anything");
6798 pedwarn (loc, OPT_pedantic,
6799 "ISO C99 doesn%'t support unnamed structs/unions");
6801 pedwarn (loc, OPT_pedantic,
6802 "ISO C90 doesn%'t support unnamed structs/unions");
6806 value = grokdeclarator (declarator, declspecs, FIELD, false,
6807 width ? &width : NULL, decl_attrs, NULL, NULL,
6810 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6811 DECL_INITIAL (value) = width;
6813 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
6815 /* If we currently have a binding for this field, set the
6816 in_struct field in the binding, so that we warn about lookups
6818 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
6821 /* If the in_struct field is not yet set, push it on a list
6822 to be cleared when this struct is finished. */
6825 VEC_safe_push (c_binding_ptr, heap,
6826 struct_parse_info->fields, b);
6835 /* Subroutine of detect_field_duplicates: return whether X and Y,
6836 which are both fields in the same struct, have duplicate field
6840 is_duplicate_field (tree x, tree y)
6842 if (DECL_NAME (x) != NULL_TREE && DECL_NAME (x) == DECL_NAME (y))
6845 /* When using -fplan9-extensions, an anonymous field whose name is a
6846 typedef can duplicate a field name. */
6847 if (flag_plan9_extensions
6848 && (DECL_NAME (x) == NULL_TREE || DECL_NAME (y) == NULL_TREE))
6850 tree xt, xn, yt, yn;
6853 if (DECL_NAME (x) != NULL_TREE)
6855 else if ((TREE_CODE (xt) == RECORD_TYPE || TREE_CODE (xt) == UNION_TYPE)
6856 && TYPE_NAME (xt) != NULL_TREE
6857 && TREE_CODE (TYPE_NAME (xt)) == TYPE_DECL)
6858 xn = DECL_NAME (TYPE_NAME (xt));
6863 if (DECL_NAME (y) != NULL_TREE)
6865 else if ((TREE_CODE (yt) == RECORD_TYPE || TREE_CODE (yt) == UNION_TYPE)
6866 && TYPE_NAME (yt) != NULL_TREE
6867 && TREE_CODE (TYPE_NAME (yt)) == TYPE_DECL)
6868 yn = DECL_NAME (TYPE_NAME (yt));
6872 if (xn != NULL_TREE && xn == yn)
6879 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6880 to HTAB, giving errors for any duplicates. */
6883 detect_field_duplicates_hash (tree fieldlist, htab_t htab)
6888 for (x = fieldlist; x ; x = DECL_CHAIN (x))
6889 if ((y = DECL_NAME (x)) != 0)
6891 slot = htab_find_slot (htab, y, INSERT);
6894 error ("duplicate member %q+D", x);
6895 DECL_NAME (x) = NULL_TREE;
6899 else if (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6900 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
6902 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x)), htab);
6904 /* When using -fplan9-extensions, an anonymous field whose
6905 name is a typedef can duplicate a field name. */
6906 if (flag_plan9_extensions
6907 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
6908 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL)
6910 tree xn = DECL_NAME (TYPE_NAME (TREE_TYPE (x)));
6911 slot = htab_find_slot (htab, xn, INSERT);
6913 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x)));
6919 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6920 the list such that this does not present a problem later. */
6923 detect_field_duplicates (tree fieldlist)
6928 /* If the struct is the list of instance variables of an Objective-C
6929 class, then we need to check all the instance variables of
6930 superclasses when checking for duplicates (since you can't have
6931 an instance variable in a subclass with the same name as an
6932 instance variable in a superclass). We pass on this job to the
6933 Objective-C compiler. objc_detect_field_duplicates() will return
6934 false if we are not checking the list of instance variables and
6935 the C frontend should proceed with the standard field duplicate
6936 checks. If we are checking the list of instance variables, the
6937 ObjC frontend will do the check, emit the errors if needed, and
6938 then return true. */
6939 if (c_dialect_objc ())
6940 if (objc_detect_field_duplicates (false))
6943 /* First, see if there are more than "a few" fields.
6944 This is trivially true if there are zero or one fields. */
6945 if (!fieldlist || !DECL_CHAIN (fieldlist))
6950 if (DECL_NAME (x) == NULL_TREE
6951 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6952 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
6955 } while (timeout > 0 && x);
6957 /* If there were "few" fields and no anonymous structures or unions,
6958 avoid the overhead of allocating a hash table. Instead just do
6959 the nested traversal thing. */
6962 for (x = DECL_CHAIN (fieldlist); x; x = DECL_CHAIN (x))
6963 /* When using -fplan9-extensions, we can have duplicates
6964 between typedef names and fields. */
6966 || (flag_plan9_extensions
6967 && DECL_NAME (x) == NULL_TREE
6968 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
6969 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
6970 && TYPE_NAME (TREE_TYPE (x)) != NULL_TREE
6971 && TREE_CODE (TYPE_NAME (TREE_TYPE (x))) == TYPE_DECL))
6973 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
6974 if (is_duplicate_field (y, x))
6976 error ("duplicate member %q+D", x);
6977 DECL_NAME (x) = NULL_TREE;
6983 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
6985 detect_field_duplicates_hash (fieldlist, htab);
6990 /* Finish up struct info used by -Wc++-compat. */
6993 warn_cxx_compat_finish_struct (tree fieldlist)
6997 struct c_binding *b;
6999 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7000 the current struct. We do this now at the end of the struct
7001 because the flag is used to issue visibility warnings, and we
7002 only want to issue those warnings if the type is referenced
7003 outside of the struct declaration. */
7004 FOR_EACH_VEC_ELT (tree, struct_parse_info->struct_types, ix, x)
7005 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
7007 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7008 typedefs used when declaring fields in this struct. If the name
7009 of any of the fields is also a typedef name then the struct would
7010 not parse in C++, because the C++ lookup rules say that the
7011 typedef name would be looked up in the context of the struct, and
7012 would thus be the field rather than the typedef. */
7013 if (!VEC_empty (tree, struct_parse_info->typedefs_seen)
7014 && fieldlist != NULL_TREE)
7016 /* Use a pointer_set using the name of the typedef. We can use
7017 a pointer_set because identifiers are interned. */
7018 struct pointer_set_t *tset = pointer_set_create ();
7020 FOR_EACH_VEC_ELT (tree, struct_parse_info->typedefs_seen, ix, x)
7021 pointer_set_insert (tset, DECL_NAME (x));
7023 for (x = fieldlist; x != NULL_TREE; x = DECL_CHAIN (x))
7025 if (DECL_NAME (x) != NULL_TREE
7026 && pointer_set_contains (tset, DECL_NAME (x)))
7028 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
7029 ("using %qD as both field and typedef name is "
7032 /* FIXME: It would be nice to report the location where
7033 the typedef name is used. */
7037 pointer_set_destroy (tset);
7040 /* For each field which has a binding and which was not defined in
7041 an enclosing struct, clear the in_struct field. */
7042 FOR_EACH_VEC_ELT (c_binding_ptr, struct_parse_info->fields, ix, b)
7046 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7047 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7048 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7049 ATTRIBUTES are attributes to be applied to the structure.
7051 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7052 the struct was started. */
7055 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
7056 struct c_struct_parse_info *enclosing_struct_parse_info)
7059 bool toplevel = file_scope == current_scope;
7060 int saw_named_field;
7062 /* If this type was previously laid out as a forward reference,
7063 make sure we lay it out again. */
7067 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7071 for (x = fieldlist; x; x = DECL_CHAIN (x))
7073 if (DECL_NAME (x) != 0)
7076 && (TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7077 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE))
7083 if (TREE_CODE (t) == UNION_TYPE)
7086 pedwarn (loc, OPT_pedantic, "union has no named members");
7088 pedwarn (loc, OPT_pedantic, "union has no members");
7093 pedwarn (loc, OPT_pedantic, "struct has no named members");
7095 pedwarn (loc, OPT_pedantic, "struct has no members");
7100 /* Install struct as DECL_CONTEXT of each field decl.
7101 Also process specified field sizes, found in the DECL_INITIAL,
7102 storing 0 there after the type has been changed to precision equal
7103 to its width, rather than the precision of the specified standard
7104 type. (Correct layout requires the original type to have been preserved
7107 saw_named_field = 0;
7108 for (x = fieldlist; x; x = DECL_CHAIN (x))
7110 if (TREE_TYPE (x) == error_mark_node)
7113 DECL_CONTEXT (x) = t;
7115 /* If any field is const, the structure type is pseudo-const. */
7116 if (TREE_READONLY (x))
7117 C_TYPE_FIELDS_READONLY (t) = 1;
7120 /* A field that is pseudo-const makes the structure likewise. */
7121 tree t1 = strip_array_types (TREE_TYPE (x));
7122 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
7123 && C_TYPE_FIELDS_READONLY (t1))
7124 C_TYPE_FIELDS_READONLY (t) = 1;
7127 /* Any field that is volatile means variables of this type must be
7128 treated in some ways as volatile. */
7129 if (TREE_THIS_VOLATILE (x))
7130 C_TYPE_FIELDS_VOLATILE (t) = 1;
7132 /* Any field of nominal variable size implies structure is too. */
7133 if (C_DECL_VARIABLE_SIZE (x))
7134 C_TYPE_VARIABLE_SIZE (t) = 1;
7136 if (DECL_INITIAL (x))
7138 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
7139 DECL_SIZE (x) = bitsize_int (width);
7140 DECL_BIT_FIELD (x) = 1;
7141 SET_DECL_C_BIT_FIELD (x);
7145 && (DECL_BIT_FIELD (x)
7146 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
7147 DECL_PACKED (x) = 1;
7149 /* Detect flexible array member in an invalid context. */
7150 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
7151 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
7152 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
7153 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
7155 if (TREE_CODE (t) == UNION_TYPE)
7157 error_at (DECL_SOURCE_LOCATION (x),
7158 "flexible array member in union");
7159 TREE_TYPE (x) = error_mark_node;
7161 else if (DECL_CHAIN (x) != NULL_TREE)
7163 error_at (DECL_SOURCE_LOCATION (x),
7164 "flexible array member not at end of struct");
7165 TREE_TYPE (x) = error_mark_node;
7167 else if (!saw_named_field)
7169 error_at (DECL_SOURCE_LOCATION (x),
7170 "flexible array member in otherwise empty struct");
7171 TREE_TYPE (x) = error_mark_node;
7175 if (pedantic && TREE_CODE (t) == RECORD_TYPE
7176 && flexible_array_type_p (TREE_TYPE (x)))
7177 pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic,
7178 "invalid use of structure with flexible array member");
7181 || TREE_CODE (TREE_TYPE (x)) == RECORD_TYPE
7182 || TREE_CODE (TREE_TYPE (x)) == UNION_TYPE)
7183 saw_named_field = 1;
7186 detect_field_duplicates (fieldlist);
7188 /* Now we have the nearly final fieldlist. Record it,
7189 then lay out the structure or union (including the fields). */
7191 TYPE_FIELDS (t) = fieldlist;
7195 /* Give bit-fields their proper types. */
7197 tree *fieldlistp = &fieldlist;
7199 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
7200 && TREE_TYPE (*fieldlistp) != error_mark_node)
7202 unsigned HOST_WIDE_INT width
7203 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
7204 tree type = TREE_TYPE (*fieldlistp);
7205 if (width != TYPE_PRECISION (type))
7207 TREE_TYPE (*fieldlistp)
7208 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
7209 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
7211 DECL_INITIAL (*fieldlistp) = 0;
7214 fieldlistp = &DECL_CHAIN (*fieldlistp);
7217 /* Now we have the truly final field list.
7218 Store it in this type and in the variants. */
7220 TYPE_FIELDS (t) = fieldlist;
7222 /* If there are lots of fields, sort so we can look through them fast.
7223 We arbitrarily consider 16 or more elts to be "a lot". */
7228 for (x = fieldlist; x; x = DECL_CHAIN (x))
7230 if (len > 15 || DECL_NAME (x) == NULL)
7238 struct lang_type *space;
7239 struct sorted_fields_type *space2;
7241 len += list_length (x);
7243 /* Use the same allocation policy here that make_node uses, to
7244 ensure that this lives as long as the rest of the struct decl.
7245 All decls in an inline function need to be saved. */
7247 space = ggc_alloc_cleared_lang_type (sizeof (struct lang_type));
7248 space2 = ggc_alloc_sorted_fields_type
7249 (sizeof (struct sorted_fields_type) + len * sizeof (tree));
7253 field_array = &space2->elts[0];
7254 for (x = fieldlist; x; x = DECL_CHAIN (x))
7256 field_array[len++] = x;
7258 /* If there is anonymous struct or union, break out of the loop. */
7259 if (DECL_NAME (x) == NULL)
7262 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7265 TYPE_LANG_SPECIFIC (t) = space;
7266 TYPE_LANG_SPECIFIC (t)->s->len = len;
7267 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
7268 qsort (field_array, len, sizeof (tree), field_decl_cmp);
7273 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
7275 TYPE_FIELDS (x) = TYPE_FIELDS (t);
7276 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
7277 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
7278 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
7279 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
7282 /* If this was supposed to be a transparent union, but we can't
7283 make it one, warn and turn off the flag. */
7284 if (TREE_CODE (t) == UNION_TYPE
7285 && TYPE_TRANSPARENT_AGGR (t)
7286 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
7288 TYPE_TRANSPARENT_AGGR (t) = 0;
7289 warning_at (loc, 0, "union cannot be made transparent");
7292 /* If this structure or union completes the type of any previous
7293 variable declaration, lay it out and output its rtl. */
7294 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
7298 tree decl = TREE_VALUE (x);
7299 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
7300 layout_array_type (TREE_TYPE (decl));
7301 if (TREE_CODE (decl) != TYPE_DECL)
7303 layout_decl (decl, 0);
7304 if (c_dialect_objc ())
7305 objc_check_decl (decl);
7306 rest_of_decl_compilation (decl, toplevel, 0);
7311 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
7313 /* Update type location to the one of the definition, instead of e.g.
7314 a forward declaration. */
7315 if (TYPE_STUB_DECL (t))
7316 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
7318 /* Finish debugging output for this type. */
7319 rest_of_type_compilation (t, toplevel);
7321 /* If we're inside a function proper, i.e. not file-scope and not still
7322 parsing parameters, then arrange for the size of a variable sized type
7324 if (building_stmt_list_p () && variably_modified_type_p (t, NULL_TREE))
7325 add_stmt (build_stmt (loc,
7326 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
7328 if (warn_cxx_compat)
7329 warn_cxx_compat_finish_struct (fieldlist);
7331 VEC_free (tree, heap, struct_parse_info->struct_types);
7332 VEC_free (c_binding_ptr, heap, struct_parse_info->fields);
7333 VEC_free (tree, heap, struct_parse_info->typedefs_seen);
7334 XDELETE (struct_parse_info);
7336 struct_parse_info = enclosing_struct_parse_info;
7338 /* If this struct is defined inside a struct, add it to
7341 && struct_parse_info != NULL
7342 && !in_sizeof && !in_typeof && !in_alignof)
7343 VEC_safe_push (tree, heap, struct_parse_info->struct_types, t);
7348 /* Lay out the type T, and its element type, and so on. */
7351 layout_array_type (tree t)
7353 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
7354 layout_array_type (TREE_TYPE (t));
7358 /* Begin compiling the definition of an enumeration type.
7359 NAME is its name (or null if anonymous).
7360 LOC is the enum's location.
7361 Returns the type object, as yet incomplete.
7362 Also records info about it so that build_enumerator
7363 may be used to declare the individual values as they are read. */
7366 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
7368 tree enumtype = NULL_TREE;
7369 location_t enumloc = UNKNOWN_LOCATION;
7371 /* If this is the real definition for a previous forward reference,
7372 fill in the contents in the same object that used to be the
7373 forward reference. */
7375 if (name != NULL_TREE)
7376 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
7378 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
7380 enumtype = make_node (ENUMERAL_TYPE);
7381 pushtag (loc, name, enumtype);
7384 if (C_TYPE_BEING_DEFINED (enumtype))
7385 error_at (loc, "nested redefinition of %<enum %E%>", name);
7387 C_TYPE_BEING_DEFINED (enumtype) = 1;
7389 if (TYPE_VALUES (enumtype) != 0)
7391 /* This enum is a named one that has been declared already. */
7392 error_at (loc, "redeclaration of %<enum %E%>", name);
7393 if (enumloc != UNKNOWN_LOCATION)
7394 inform (enumloc, "originally defined here");
7396 /* Completely replace its old definition.
7397 The old enumerators remain defined, however. */
7398 TYPE_VALUES (enumtype) = 0;
7401 the_enum->enum_next_value = integer_zero_node;
7402 the_enum->enum_overflow = 0;
7404 if (flag_short_enums)
7405 TYPE_PACKED (enumtype) = 1;
7407 /* FIXME: This will issue a warning for a use of a type defined
7408 within sizeof in a statement expr. This is not terribly serious
7409 as C++ doesn't permit statement exprs within sizeof anyhow. */
7410 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
7411 warning_at (loc, OPT_Wc___compat,
7412 "defining type in %qs expression is invalid in C++",
7415 : (in_typeof ? "typeof" : "alignof")));
7420 /* After processing and defining all the values of an enumeration type,
7421 install their decls in the enumeration type and finish it off.
7422 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7423 and ATTRIBUTES are the specified attributes.
7424 Returns ENUMTYPE. */
7427 finish_enum (tree enumtype, tree values, tree attributes)
7430 tree minnode = 0, maxnode = 0;
7431 int precision, unsign;
7432 bool toplevel = (file_scope == current_scope);
7433 struct lang_type *lt;
7435 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
7437 /* Calculate the maximum value of any enumerator in this type. */
7439 if (values == error_mark_node)
7440 minnode = maxnode = integer_zero_node;
7443 minnode = maxnode = TREE_VALUE (values);
7444 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7446 tree value = TREE_VALUE (pair);
7447 if (tree_int_cst_lt (maxnode, value))
7449 if (tree_int_cst_lt (value, minnode))
7454 /* Construct the final type of this enumeration. It is the same
7455 as one of the integral types - the narrowest one that fits, except
7456 that normally we only go as narrow as int - and signed iff any of
7457 the values are negative. */
7458 unsign = (tree_int_cst_sgn (minnode) >= 0);
7459 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
7460 tree_int_cst_min_precision (maxnode, unsign));
7462 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7464 tem = c_common_type_for_size (precision, unsign);
7467 warning (0, "enumeration values exceed range of largest integer");
7468 tem = long_long_integer_type_node;
7472 tem = unsign ? unsigned_type_node : integer_type_node;
7474 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7475 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7476 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7477 TYPE_SIZE (enumtype) = 0;
7479 /* If the precision of the type was specific with an attribute and it
7480 was too small, give an error. Otherwise, use it. */
7481 if (TYPE_PRECISION (enumtype))
7483 if (precision > TYPE_PRECISION (enumtype))
7484 error ("specified mode too small for enumeral values");
7487 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7489 layout_type (enumtype);
7491 if (values != error_mark_node)
7493 /* Change the type of the enumerators to be the enum type. We
7494 need to do this irrespective of the size of the enum, for
7495 proper type checking. Replace the DECL_INITIALs of the
7496 enumerators, and the value slots of the list, with copies
7497 that have the enum type; they cannot be modified in place
7498 because they may be shared (e.g. integer_zero_node) Finally,
7499 change the purpose slots to point to the names of the decls. */
7500 for (pair = values; pair; pair = TREE_CHAIN (pair))
7502 tree enu = TREE_PURPOSE (pair);
7503 tree ini = DECL_INITIAL (enu);
7505 TREE_TYPE (enu) = enumtype;
7507 /* The ISO C Standard mandates enumerators to have type int,
7508 even though the underlying type of an enum type is
7509 unspecified. However, GCC allows enumerators of any
7510 integer type as an extensions. build_enumerator()
7511 converts any enumerators that fit in an int to type int,
7512 to avoid promotions to unsigned types when comparing
7513 integers with enumerators that fit in the int range.
7514 When -pedantic is given, build_enumerator() would have
7515 already warned about those that don't fit. Here we
7516 convert the rest to the enumerator type. */
7517 if (TREE_TYPE (ini) != integer_type_node)
7518 ini = convert (enumtype, ini);
7520 DECL_INITIAL (enu) = ini;
7521 TREE_PURPOSE (pair) = DECL_NAME (enu);
7522 TREE_VALUE (pair) = ini;
7525 TYPE_VALUES (enumtype) = values;
7528 /* Record the min/max values so that we can warn about bit-field
7529 enumerations that are too small for the values. */
7530 lt = ggc_alloc_cleared_lang_type (sizeof (struct lang_type));
7531 lt->enum_min = minnode;
7532 lt->enum_max = maxnode;
7533 TYPE_LANG_SPECIFIC (enumtype) = lt;
7535 /* Fix up all variant types of this enum type. */
7536 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7538 if (tem == enumtype)
7540 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7541 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7542 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7543 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7544 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7545 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7546 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7547 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7548 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7549 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7550 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7553 /* Finish debugging output for this type. */
7554 rest_of_type_compilation (enumtype, toplevel);
7556 /* If this enum is defined inside a struct, add it to
7559 && struct_parse_info != NULL
7560 && !in_sizeof && !in_typeof && !in_alignof)
7561 VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype);
7566 /* Build and install a CONST_DECL for one value of the
7567 current enumeration type (one that was begun with start_enum).
7568 DECL_LOC is the location of the enumerator.
7569 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7570 Return a tree-list containing the CONST_DECL and its value.
7571 Assignment of sequential values by default is handled here. */
7574 build_enumerator (location_t decl_loc, location_t loc,
7575 struct c_enum_contents *the_enum, tree name, tree value)
7579 /* Validate and default VALUE. */
7583 /* Don't issue more errors for error_mark_node (i.e. an
7584 undeclared identifier) - just ignore the value expression. */
7585 if (value == error_mark_node)
7587 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7589 error_at (loc, "enumerator value for %qE is not an integer constant",
7595 if (TREE_CODE (value) != INTEGER_CST)
7597 value = c_fully_fold (value, false, NULL);
7598 if (TREE_CODE (value) == INTEGER_CST)
7599 pedwarn (loc, OPT_pedantic,
7600 "enumerator value for %qE is not an integer "
7601 "constant expression", name);
7603 if (TREE_CODE (value) != INTEGER_CST)
7605 error ("enumerator value for %qE is not an integer constant",
7611 value = default_conversion (value);
7612 constant_expression_warning (value);
7617 /* Default based on previous value. */
7618 /* It should no longer be possible to have NON_LVALUE_EXPR
7622 value = the_enum->enum_next_value;
7623 if (the_enum->enum_overflow)
7624 error_at (loc, "overflow in enumeration values");
7626 /* Even though the underlying type of an enum is unspecified, the
7627 type of enumeration constants is explicitly defined as int
7628 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7630 else if (!int_fits_type_p (value, integer_type_node))
7631 pedwarn (loc, OPT_pedantic,
7632 "ISO C restricts enumerator values to range of %<int%>");
7634 /* The ISO C Standard mandates enumerators to have type int, even
7635 though the underlying type of an enum type is unspecified.
7636 However, GCC allows enumerators of any integer type as an
7637 extensions. Here we convert any enumerators that fit in an int
7638 to type int, to avoid promotions to unsigned types when comparing
7639 integers with enumerators that fit in the int range. When
7640 -pedantic is given, we would have already warned about those that
7641 don't fit. We have to do this here rather than in finish_enum
7642 because this value may be used to define more enumerators. */
7643 if (int_fits_type_p (value, integer_type_node))
7644 value = convert (integer_type_node, value);
7646 /* Set basis for default for next value. */
7647 the_enum->enum_next_value
7648 = build_binary_op (EXPR_LOC_OR_HERE (value),
7649 PLUS_EXPR, value, integer_one_node, 0);
7650 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7652 /* Now create a declaration for the enum value name. */
7654 type = TREE_TYPE (value);
7655 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7656 TYPE_PRECISION (integer_type_node)),
7657 (TYPE_PRECISION (type)
7658 >= TYPE_PRECISION (integer_type_node)
7659 && TYPE_UNSIGNED (type)));
7661 decl = build_decl (decl_loc, CONST_DECL, name, type);
7662 DECL_INITIAL (decl) = convert (type, value);
7665 return tree_cons (decl, value, NULL_TREE);
7669 /* Create the FUNCTION_DECL for a function definition.
7670 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7671 the declaration; they describe the function's name and the type it returns,
7672 but twisted together in a fashion that parallels the syntax of C.
7674 This function creates a binding context for the function body
7675 as well as setting up the FUNCTION_DECL in current_function_decl.
7677 Returns 1 on success. If the DECLARATOR is not suitable for a function
7678 (it defines a datum instead), we return 0, which tells
7679 yyparse to report a parse error. */
7682 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7685 tree decl1, old_decl;
7686 tree restype, resdecl;
7689 current_function_returns_value = 0; /* Assume, until we see it does. */
7690 current_function_returns_null = 0;
7691 current_function_returns_abnormally = 0;
7692 warn_about_return_type = 0;
7693 c_switch_stack = NULL;
7695 /* Indicate no valid break/continue context by setting these variables
7696 to some non-null, non-label value. We'll notice and emit the proper
7697 error message in c_finish_bc_stmt. */
7698 c_break_label = c_cont_label = size_zero_node;
7700 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7701 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7703 /* If the declarator is not suitable for a function definition,
7704 cause a syntax error. */
7706 || TREE_CODE (decl1) != FUNCTION_DECL)
7709 loc = DECL_SOURCE_LOCATION (decl1);
7711 decl_attributes (&decl1, attributes, 0);
7713 if (DECL_DECLARED_INLINE_P (decl1)
7714 && DECL_UNINLINABLE (decl1)
7715 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7716 warning_at (loc, OPT_Wattributes,
7717 "inline function %qD given attribute noinline",
7720 /* Handle gnu_inline attribute. */
7721 if (declspecs->inline_p
7722 && !flag_gnu89_inline
7723 && TREE_CODE (decl1) == FUNCTION_DECL
7724 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7725 || current_function_decl))
7727 if (declspecs->storage_class != csc_static)
7728 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7731 announce_function (decl1);
7733 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7735 error_at (loc, "return type is an incomplete type");
7736 /* Make it return void instead. */
7738 = build_function_type (void_type_node,
7739 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7742 if (warn_about_return_type)
7743 pedwarn_c99 (loc, flag_isoc99 ? 0
7744 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7745 "return type defaults to %<int%>");
7747 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7748 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7749 DECL_INITIAL (decl1) = error_mark_node;
7751 /* A nested function is not global. */
7752 if (current_function_decl != 0)
7753 TREE_PUBLIC (decl1) = 0;
7755 /* If this definition isn't a prototype and we had a prototype declaration
7756 before, copy the arg type info from that prototype. */
7757 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7758 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7760 current_function_prototype_locus = UNKNOWN_LOCATION;
7761 current_function_prototype_built_in = false;
7762 current_function_prototype_arg_types = NULL_TREE;
7763 if (!prototype_p (TREE_TYPE (decl1)))
7765 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7766 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7767 TREE_TYPE (TREE_TYPE (old_decl))))
7769 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7771 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7772 current_function_prototype_built_in
7773 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7774 current_function_prototype_arg_types
7775 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7777 if (TREE_PUBLIC (decl1))
7779 /* If there is an external prototype declaration of this
7780 function, record its location but do not copy information
7781 to this decl. This may be an invisible declaration
7782 (built-in or in a scope which has finished) or simply
7783 have more refined argument types than any declaration
7785 struct c_binding *b;
7786 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7787 if (B_IN_SCOPE (b, external_scope))
7791 tree ext_decl, ext_type;
7793 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7794 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7795 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7796 TREE_TYPE (ext_type)))
7798 current_function_prototype_locus
7799 = DECL_SOURCE_LOCATION (ext_decl);
7800 current_function_prototype_built_in
7801 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7802 current_function_prototype_arg_types
7803 = TYPE_ARG_TYPES (ext_type);
7809 /* Optionally warn of old-fashioned def with no previous prototype. */
7810 if (warn_strict_prototypes
7811 && old_decl != error_mark_node
7812 && !prototype_p (TREE_TYPE (decl1))
7813 && C_DECL_ISNT_PROTOTYPE (old_decl))
7814 warning_at (loc, OPT_Wstrict_prototypes,
7815 "function declaration isn%'t a prototype");
7816 /* Optionally warn of any global def with no previous prototype. */
7817 else if (warn_missing_prototypes
7818 && old_decl != error_mark_node
7819 && TREE_PUBLIC (decl1)
7820 && !MAIN_NAME_P (DECL_NAME (decl1))
7821 && C_DECL_ISNT_PROTOTYPE (old_decl))
7822 warning_at (loc, OPT_Wmissing_prototypes,
7823 "no previous prototype for %qD", decl1);
7824 /* Optionally warn of any def with no previous prototype
7825 if the function has already been used. */
7826 else if (warn_missing_prototypes
7828 && old_decl != error_mark_node
7829 && TREE_USED (old_decl)
7830 && !prototype_p (TREE_TYPE (old_decl)))
7831 warning_at (loc, OPT_Wmissing_prototypes,
7832 "%qD was used with no prototype before its definition", decl1);
7833 /* Optionally warn of any global def with no previous declaration. */
7834 else if (warn_missing_declarations
7835 && TREE_PUBLIC (decl1)
7837 && !MAIN_NAME_P (DECL_NAME (decl1)))
7838 warning_at (loc, OPT_Wmissing_declarations,
7839 "no previous declaration for %qD",
7841 /* Optionally warn of any def with no previous declaration
7842 if the function has already been used. */
7843 else if (warn_missing_declarations
7845 && old_decl != error_mark_node
7846 && TREE_USED (old_decl)
7847 && C_DECL_IMPLICIT (old_decl))
7848 warning_at (loc, OPT_Wmissing_declarations,
7849 "%qD was used with no declaration before its definition", decl1);
7851 /* This function exists in static storage.
7852 (This does not mean `static' in the C sense!) */
7853 TREE_STATIC (decl1) = 1;
7855 /* This is the earliest point at which we might know the assembler
7856 name of the function. Thus, if it's set before this, die horribly. */
7857 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
7859 /* If #pragma weak was used, mark the decl weak now. */
7860 if (current_scope == file_scope)
7861 maybe_apply_pragma_weak (decl1);
7863 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7864 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
7866 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
7867 != integer_type_node)
7868 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
7870 check_main_parameter_types (decl1);
7872 if (!TREE_PUBLIC (decl1))
7873 pedwarn (loc, OPT_Wmain,
7874 "%qD is normally a non-static function", decl1);
7877 /* Record the decl so that the function name is defined.
7878 If we already have a decl for this name, and it is a FUNCTION_DECL,
7879 use the old decl. */
7881 current_function_decl = pushdecl (decl1);
7884 declare_parm_level ();
7886 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
7887 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
7888 DECL_ARTIFICIAL (resdecl) = 1;
7889 DECL_IGNORED_P (resdecl) = 1;
7890 DECL_RESULT (current_function_decl) = resdecl;
7892 start_fname_decls ();
7897 /* Subroutine of store_parm_decls which handles new-style function
7898 definitions (prototype format). The parms already have decls, so we
7899 need only record them as in effect and complain if any redundant
7900 old-style parm decls were written. */
7902 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
7908 if (current_scope->bindings)
7910 error_at (DECL_SOURCE_LOCATION (fndecl),
7911 "old-style parameter declarations in prototyped "
7912 "function definition");
7914 /* Get rid of the old-style declarations. */
7918 /* Don't issue this warning for nested functions, and don't issue this
7919 warning if we got here because ARG_INFO_TYPES was error_mark_node
7920 (this happens when a function definition has just an ellipsis in
7921 its parameter list). */
7922 else if (!in_system_header && !current_function_scope
7923 && arg_info->types != error_mark_node)
7924 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
7925 "traditional C rejects ISO C style function definitions");
7927 /* Now make all the parameter declarations visible in the function body.
7928 We can bypass most of the grunt work of pushdecl. */
7929 for (decl = arg_info->parms; decl; decl = DECL_CHAIN (decl))
7931 DECL_CONTEXT (decl) = current_function_decl;
7932 if (DECL_NAME (decl))
7934 bind (DECL_NAME (decl), decl, current_scope,
7935 /*invisible=*/false, /*nested=*/false,
7937 if (!TREE_USED (decl))
7938 warn_if_shadowing (decl);
7941 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
7944 /* Record the parameter list in the function declaration. */
7945 DECL_ARGUMENTS (fndecl) = arg_info->parms;
7947 /* Now make all the ancillary declarations visible, likewise. */
7948 for (decl = arg_info->others; decl; decl = DECL_CHAIN (decl))
7950 DECL_CONTEXT (decl) = current_function_decl;
7951 if (DECL_NAME (decl))
7952 bind (DECL_NAME (decl), decl, current_scope,
7953 /*invisible=*/false,
7954 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL),
7958 /* And all the tag declarations. */
7959 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag, arg_info->tags, ix, tag)
7961 bind (tag->id, tag->type, current_scope,
7962 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7965 /* Subroutine of store_parm_decls which handles old-style function
7966 definitions (separate parameter list and declarations). */
7969 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
7971 struct c_binding *b;
7972 tree parm, decl, last;
7973 tree parmids = arg_info->parms;
7974 struct pointer_set_t *seen_args = pointer_set_create ();
7976 if (!in_system_header)
7977 warning_at (DECL_SOURCE_LOCATION (fndecl),
7978 OPT_Wold_style_definition, "old-style function definition");
7980 /* Match each formal parameter name with its declaration. Save each
7981 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7982 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7984 if (TREE_VALUE (parm) == 0)
7986 error_at (DECL_SOURCE_LOCATION (fndecl),
7987 "parameter name missing from parameter list");
7988 TREE_PURPOSE (parm) = 0;
7992 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
7993 if (b && B_IN_CURRENT_SCOPE (b))
7996 /* Skip erroneous parameters. */
7997 if (decl == error_mark_node)
7999 /* If we got something other than a PARM_DECL it is an error. */
8000 if (TREE_CODE (decl) != PARM_DECL)
8001 error_at (DECL_SOURCE_LOCATION (decl),
8002 "%qD declared as a non-parameter", decl);
8003 /* If the declaration is already marked, we have a duplicate
8004 name. Complain and ignore the duplicate. */
8005 else if (pointer_set_contains (seen_args, decl))
8007 error_at (DECL_SOURCE_LOCATION (decl),
8008 "multiple parameters named %qD", decl);
8009 TREE_PURPOSE (parm) = 0;
8012 /* If the declaration says "void", complain and turn it into
8014 else if (VOID_TYPE_P (TREE_TYPE (decl)))
8016 error_at (DECL_SOURCE_LOCATION (decl),
8017 "parameter %qD declared with void type", decl);
8018 TREE_TYPE (decl) = integer_type_node;
8019 DECL_ARG_TYPE (decl) = integer_type_node;
8020 layout_decl (decl, 0);
8022 warn_if_shadowing (decl);
8024 /* If no declaration found, default to int. */
8027 /* FIXME diagnostics: This should be the location of the argument,
8028 not the FNDECL. E.g., for an old-style declaration
8030 int f10(v) { blah; }
8032 We should use the location of the V, not the F10.
8033 Unfortunately, the V is an IDENTIFIER_NODE which has no
8034 location. In the future we need locations for c_arg_info
8037 See gcc.dg/Wshadow-3.c for an example of this problem. */
8038 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
8039 PARM_DECL, TREE_VALUE (parm), integer_type_node);
8040 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
8042 warn_if_shadowing (decl);
8045 pedwarn (DECL_SOURCE_LOCATION (decl),
8046 0, "type of %qD defaults to %<int%>", decl);
8048 warning_at (DECL_SOURCE_LOCATION (decl),
8049 OPT_Wmissing_parameter_type,
8050 "type of %qD defaults to %<int%>", decl);
8053 TREE_PURPOSE (parm) = decl;
8054 pointer_set_insert (seen_args, decl);
8057 /* Now examine the parms chain for incomplete declarations
8058 and declarations with no corresponding names. */
8060 for (b = current_scope->bindings; b; b = b->prev)
8063 if (TREE_CODE (parm) != PARM_DECL)
8066 if (TREE_TYPE (parm) != error_mark_node
8067 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
8069 error_at (DECL_SOURCE_LOCATION (parm),
8070 "parameter %qD has incomplete type", parm);
8071 TREE_TYPE (parm) = error_mark_node;
8074 if (!pointer_set_contains (seen_args, parm))
8076 error_at (DECL_SOURCE_LOCATION (parm),
8077 "declaration for parameter %qD but no such parameter",
8080 /* Pretend the parameter was not missing.
8081 This gets us to a standard state and minimizes
8082 further error messages. */
8083 parmids = chainon (parmids, tree_cons (parm, 0, 0));
8087 /* Chain the declarations together in the order of the list of
8088 names. Store that chain in the function decl, replacing the
8089 list of names. Update the current scope to match. */
8090 DECL_ARGUMENTS (fndecl) = 0;
8092 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
8093 if (TREE_PURPOSE (parm))
8095 if (parm && TREE_PURPOSE (parm))
8097 last = TREE_PURPOSE (parm);
8098 DECL_ARGUMENTS (fndecl) = last;
8100 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
8101 if (TREE_PURPOSE (parm))
8103 DECL_CHAIN (last) = TREE_PURPOSE (parm);
8104 last = TREE_PURPOSE (parm);
8106 DECL_CHAIN (last) = 0;
8109 pointer_set_destroy (seen_args);
8111 /* If there was a previous prototype,
8112 set the DECL_ARG_TYPE of each argument according to
8113 the type previously specified, and report any mismatches. */
8115 if (current_function_prototype_arg_types)
8118 for (parm = DECL_ARGUMENTS (fndecl),
8119 type = current_function_prototype_arg_types;
8120 parm || (type && TREE_VALUE (type) != error_mark_node
8121 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
8122 parm = DECL_CHAIN (parm), type = TREE_CHAIN (type))
8124 if (parm == 0 || type == 0
8125 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
8127 if (current_function_prototype_built_in)
8128 warning_at (DECL_SOURCE_LOCATION (fndecl),
8129 0, "number of arguments doesn%'t match "
8130 "built-in prototype");
8133 /* FIXME diagnostics: This should be the location of
8134 FNDECL, but there is bug when a prototype is
8135 declared inside function context, but defined
8136 outside of it (e.g., gcc.dg/pr15698-2.c). In
8137 which case FNDECL gets the location of the
8138 prototype, not the definition. */
8139 error_at (input_location,
8140 "number of arguments doesn%'t match prototype");
8142 error_at (current_function_prototype_locus,
8143 "prototype declaration");
8147 /* Type for passing arg must be consistent with that
8148 declared for the arg. ISO C says we take the unqualified
8149 type for parameters declared with qualified type. */
8150 if (TREE_TYPE (parm) != error_mark_node
8151 && TREE_TYPE (type) != error_mark_node
8152 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
8153 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
8155 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
8156 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
8158 /* Adjust argument to match prototype. E.g. a previous
8159 `int foo(float);' prototype causes
8160 `int foo(x) float x; {...}' to be treated like
8161 `int foo(float x) {...}'. This is particularly
8162 useful for argument types like uid_t. */
8163 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
8165 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
8166 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
8167 && TYPE_PRECISION (TREE_TYPE (parm))
8168 < TYPE_PRECISION (integer_type_node))
8169 DECL_ARG_TYPE (parm) = integer_type_node;
8171 /* ??? Is it possible to get here with a
8172 built-in prototype or will it always have
8173 been diagnosed as conflicting with an
8174 old-style definition and discarded? */
8175 if (current_function_prototype_built_in)
8176 warning_at (DECL_SOURCE_LOCATION (parm),
8177 OPT_pedantic, "promoted argument %qD "
8178 "doesn%'t match built-in prototype", parm);
8181 pedwarn (DECL_SOURCE_LOCATION (parm),
8182 OPT_pedantic, "promoted argument %qD "
8183 "doesn%'t match prototype", parm);
8184 pedwarn (current_function_prototype_locus, OPT_pedantic,
8185 "prototype declaration");
8190 if (current_function_prototype_built_in)
8191 warning_at (DECL_SOURCE_LOCATION (parm),
8192 0, "argument %qD doesn%'t match "
8193 "built-in prototype", parm);
8196 error_at (DECL_SOURCE_LOCATION (parm),
8197 "argument %qD doesn%'t match prototype", parm);
8198 error_at (current_function_prototype_locus,
8199 "prototype declaration");
8204 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
8207 /* Otherwise, create a prototype that would match. */
8211 tree actual = 0, last = 0, type;
8213 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = DECL_CHAIN (parm))
8215 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
8217 TREE_CHAIN (last) = type;
8222 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
8224 TREE_CHAIN (last) = type;
8228 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8229 of the type of this function, but we need to avoid having this
8230 affect the types of other similarly-typed functions, so we must
8231 first force the generation of an identical (but separate) type
8232 node for the relevant function type. The new node we create
8233 will be a variant of the main variant of the original function
8236 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
8238 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
8242 /* Store parameter declarations passed in ARG_INFO into the current
8243 function declaration. */
8246 store_parm_decls_from (struct c_arg_info *arg_info)
8248 current_function_arg_info = arg_info;
8249 store_parm_decls ();
8252 /* Store the parameter declarations into the current function declaration.
8253 This is called after parsing the parameter declarations, before
8254 digesting the body of the function.
8256 For an old-style definition, construct a prototype out of the old-style
8257 parameter declarations and inject it into the function's type. */
8260 store_parm_decls (void)
8262 tree fndecl = current_function_decl;
8265 /* The argument information block for FNDECL. */
8266 struct c_arg_info *arg_info = current_function_arg_info;
8267 current_function_arg_info = 0;
8269 /* True if this definition is written with a prototype. Note:
8270 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8271 list in a function definition as equivalent to (void) -- an
8272 empty argument list specifies the function has no parameters,
8273 but only (void) sets up a prototype for future calls. */
8274 proto = arg_info->types != 0;
8277 store_parm_decls_newstyle (fndecl, arg_info);
8279 store_parm_decls_oldstyle (fndecl, arg_info);
8281 /* The next call to push_scope will be a function body. */
8283 next_is_function_body = true;
8285 /* Write a record describing this function definition to the prototypes
8286 file (if requested). */
8288 gen_aux_info_record (fndecl, 1, 0, proto);
8290 /* Initialize the RTL code for the function. */
8291 allocate_struct_function (fndecl, false);
8293 if (warn_unused_local_typedefs)
8294 cfun->language = ggc_alloc_cleared_language_function ();
8296 /* Begin the statement tree for this function. */
8297 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
8299 /* ??? Insert the contents of the pending sizes list into the function
8300 to be evaluated. The only reason left to have this is
8301 void foo(int n, int array[n++])
8302 because we throw away the array type in favor of a pointer type, and
8303 thus won't naturally see the SAVE_EXPR containing the increment. All
8304 other pending sizes would be handled by gimplify_parameters. */
8305 if (arg_info->pending_sizes)
8306 add_stmt (arg_info->pending_sizes);
8310 /* Finish up a function declaration and compile that function
8311 all the way to assembler language output. Then free the storage
8312 for the function definition.
8314 This is called after parsing the body of the function definition. */
8317 finish_function (void)
8319 tree fndecl = current_function_decl;
8321 if (c_dialect_objc ())
8322 objc_finish_function ();
8324 if (TREE_CODE (fndecl) == FUNCTION_DECL
8325 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
8327 tree args = DECL_ARGUMENTS (fndecl);
8328 for (; args; args = DECL_CHAIN (args))
8330 tree type = TREE_TYPE (args);
8331 if (INTEGRAL_TYPE_P (type)
8332 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
8333 DECL_ARG_TYPE (args) = integer_type_node;
8337 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
8338 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
8340 /* Must mark the RESULT_DECL as being in this function. */
8342 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
8343 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
8345 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
8346 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
8347 == integer_type_node && flag_isoc99)
8349 /* Hack. We don't want the middle-end to warn that this return
8350 is unreachable, so we mark its location as special. Using
8351 UNKNOWN_LOCATION has the problem that it gets clobbered in
8352 annotate_one_with_locus. A cleaner solution might be to
8353 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8355 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
8358 /* Tie off the statement tree for this function. */
8359 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
8361 finish_fname_decls ();
8363 /* Complain if there's just no return statement. */
8364 if (warn_return_type
8365 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
8366 && !current_function_returns_value && !current_function_returns_null
8367 /* Don't complain if we are no-return. */
8368 && !current_function_returns_abnormally
8369 /* Don't complain if we are declared noreturn. */
8370 && !TREE_THIS_VOLATILE (fndecl)
8371 /* Don't warn for main(). */
8372 && !MAIN_NAME_P (DECL_NAME (fndecl))
8373 /* Or if they didn't actually specify a return type. */
8374 && !C_FUNCTION_IMPLICIT_INT (fndecl)
8375 /* Normally, with -Wreturn-type, flow will complain, but we might
8376 optimize out static functions. */
8377 && !TREE_PUBLIC (fndecl))
8379 warning (OPT_Wreturn_type,
8380 "no return statement in function returning non-void");
8381 TREE_NO_WARNING (fndecl) = 1;
8384 /* Complain about parameters that are only set, but never otherwise used. */
8385 if (warn_unused_but_set_parameter)
8389 for (decl = DECL_ARGUMENTS (fndecl);
8391 decl = DECL_CHAIN (decl))
8392 if (TREE_USED (decl)
8393 && TREE_CODE (decl) == PARM_DECL
8394 && !DECL_READ_P (decl)
8396 && !DECL_ARTIFICIAL (decl)
8397 && !TREE_NO_WARNING (decl))
8398 warning_at (DECL_SOURCE_LOCATION (decl),
8399 OPT_Wunused_but_set_parameter,
8400 "parameter %qD set but not used", decl);
8403 /* Complain about locally defined typedefs that are not used in this
8405 maybe_warn_unused_local_typedefs ();
8407 /* Store the end of the function, so that we get good line number
8408 info for the epilogue. */
8409 cfun->function_end_locus = input_location;
8411 /* Finalize the ELF visibility for the function. */
8412 c_determine_visibility (fndecl);
8414 /* For GNU C extern inline functions disregard inline limits. */
8415 if (DECL_EXTERNAL (fndecl)
8416 && DECL_DECLARED_INLINE_P (fndecl))
8417 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
8419 /* Genericize before inlining. Delay genericizing nested functions
8420 until their parent function is genericized. Since finalizing
8421 requires GENERIC, delay that as well. */
8423 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
8424 && !undef_nested_function)
8426 if (!decl_function_context (fndecl))
8428 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
8429 c_genericize (fndecl);
8431 /* ??? Objc emits functions after finalizing the compilation unit.
8432 This should be cleaned up later and this conditional removed. */
8433 if (cgraph_global_info_ready)
8435 cgraph_add_new_function (fndecl, false);
8438 cgraph_finalize_function (fndecl, false);
8442 /* Register this function with cgraph just far enough to get it
8443 added to our parent's nested function list. Handy, since the
8444 C front end doesn't have such a list. */
8445 (void) cgraph_get_create_node (fndecl);
8449 if (!decl_function_context (fndecl))
8450 undef_nested_function = false;
8452 if (cfun->language != NULL)
8454 ggc_free (cfun->language);
8455 cfun->language = NULL;
8458 /* We're leaving the context of this function, so zap cfun.
8459 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8460 tree_rest_of_compilation. */
8462 current_function_decl = NULL;
8465 /* Check the declarations given in a for-loop for satisfying the C99
8466 constraints. If exactly one such decl is found, return it. LOC is
8467 the location of the opening parenthesis of the for loop. The last
8468 parameter allows you to control the "for loop initial declarations
8469 are only allowed in C99 mode". Normally, you should pass
8470 flag_isoc99 as that parameter. But in some cases (Objective-C
8471 foreach loop, for example) we want to run the checks in this
8472 function even if not in C99 mode, so we allow the caller to turn
8473 off the error about not being in C99 mode.
8477 check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
8479 struct c_binding *b;
8480 tree one_decl = NULL_TREE;
8483 if (!turn_off_iso_c99_error)
8485 static bool hint = true;
8486 /* If we get here, declarations have been used in a for loop without
8487 the C99 for loop scope. This doesn't make much sense, so don't
8489 error_at (loc, "%<for%> loop initial declarations "
8490 "are only allowed in C99 mode");
8494 "use option -std=c99 or -std=gnu99 to compile your code");
8499 /* C99 subclause 6.8.5 paragraph 3:
8501 [#3] The declaration part of a for statement shall only
8502 declare identifiers for objects having storage class auto or
8505 It isn't clear whether, in this sentence, "identifiers" binds to
8506 "shall only declare" or to "objects" - that is, whether all identifiers
8507 declared must be identifiers for objects, or whether the restriction
8508 only applies to those that are. (A question on this in comp.std.c
8509 in November 2000 received no answer.) We implement the strictest
8510 interpretation, to avoid creating an extension which later causes
8513 for (b = current_scope->bindings; b; b = b->prev)
8516 tree decl = b->decl;
8521 switch (TREE_CODE (decl))
8525 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8526 if (TREE_STATIC (decl))
8528 "declaration of static variable %qD in %<for%> loop "
8529 "initial declaration", decl);
8530 else if (DECL_EXTERNAL (decl))
8532 "declaration of %<extern%> variable %qD in %<for%> loop "
8533 "initial declaration", decl);
8539 "%<struct %E%> declared in %<for%> loop initial "
8544 "%<union %E%> declared in %<for%> loop initial declaration",
8548 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8549 "initial declaration", id);
8552 error_at (loc, "declaration of non-variable "
8553 "%qD in %<for%> loop initial declaration", decl);
8560 return n_decls == 1 ? one_decl : NULL_TREE;
8563 /* Save and reinitialize the variables
8564 used during compilation of a C function. */
8567 c_push_function_context (void)
8569 struct language_function *p = cfun->language;
8570 /* cfun->language might have been already allocated by the use of
8571 -Wunused-local-typedefs. In that case, just re-use it. */
8573 cfun->language = p = ggc_alloc_cleared_language_function ();
8575 p->base.x_stmt_tree = c_stmt_tree;
8576 c_stmt_tree.x_cur_stmt_list
8577 = VEC_copy (tree, gc, c_stmt_tree.x_cur_stmt_list);
8578 p->x_break_label = c_break_label;
8579 p->x_cont_label = c_cont_label;
8580 p->x_switch_stack = c_switch_stack;
8581 p->arg_info = current_function_arg_info;
8582 p->returns_value = current_function_returns_value;
8583 p->returns_null = current_function_returns_null;
8584 p->returns_abnormally = current_function_returns_abnormally;
8585 p->warn_about_return_type = warn_about_return_type;
8587 push_function_context ();
8590 /* Restore the variables used during compilation of a C function. */
8593 c_pop_function_context (void)
8595 struct language_function *p;
8597 pop_function_context ();
8599 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8600 used to store data throughout the life time of the current cfun,
8601 So don't deallocate it. */
8602 if (!warn_unused_local_typedefs)
8603 cfun->language = NULL;
8605 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8606 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8608 /* Stop pointing to the local nodes about to be freed. */
8609 /* But DECL_INITIAL must remain nonzero so we know this
8610 was an actual function definition. */
8611 DECL_INITIAL (current_function_decl) = error_mark_node;
8612 DECL_ARGUMENTS (current_function_decl) = 0;
8615 c_stmt_tree = p->base.x_stmt_tree;
8616 c_break_label = p->x_break_label;
8617 c_cont_label = p->x_cont_label;
8618 c_switch_stack = p->x_switch_stack;
8619 current_function_arg_info = p->arg_info;
8620 current_function_returns_value = p->returns_value;
8621 current_function_returns_null = p->returns_null;
8622 current_function_returns_abnormally = p->returns_abnormally;
8623 warn_about_return_type = p->warn_about_return_type;
8626 /* The functions below are required for functionality of doing
8627 function at once processing in the C front end. Currently these
8628 functions are not called from anywhere in the C front end, but as
8629 these changes continue, that will change. */
8631 /* Returns the stmt_tree (if any) to which statements are currently
8632 being added. If there is no active statement-tree, NULL is
8636 current_stmt_tree (void)
8638 return &c_stmt_tree;
8641 /* Return the global value of T as a symbol. */
8644 identifier_global_value (tree t)
8646 struct c_binding *b;
8648 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8649 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8655 /* In C, the only C-linkage public declaration is at file scope. */
8658 c_linkage_bindings (tree name)
8660 return identifier_global_value (name);
8663 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8664 otherwise the name is found in ridpointers from RID_INDEX. */
8667 record_builtin_type (enum rid rid_index, const char *name, tree type)
8671 id = ridpointers[(int) rid_index];
8673 id = get_identifier (name);
8674 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8676 if (debug_hooks->type_decl)
8677 debug_hooks->type_decl (decl, false);
8680 /* Build the void_list_node (void_type_node having been created). */
8682 build_void_list_node (void)
8684 tree t = build_tree_list (NULL_TREE, void_type_node);
8688 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8691 build_c_parm (struct c_declspecs *specs, tree attrs,
8692 struct c_declarator *declarator)
8694 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8697 ret->declarator = declarator;
8701 /* Return a declarator with nested attributes. TARGET is the inner
8702 declarator to which these attributes apply. ATTRS are the
8705 struct c_declarator *
8706 build_attrs_declarator (tree attrs, struct c_declarator *target)
8708 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8709 ret->kind = cdk_attrs;
8710 ret->declarator = target;
8711 ret->u.attrs = attrs;
8715 /* Return a declarator for a function with arguments specified by ARGS
8716 and return type specified by TARGET. */
8718 struct c_declarator *
8719 build_function_declarator (struct c_arg_info *args,
8720 struct c_declarator *target)
8722 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8723 ret->kind = cdk_function;
8724 ret->declarator = target;
8725 ret->u.arg_info = args;
8729 /* Return a declarator for the identifier IDENT (which may be
8730 NULL_TREE for an abstract declarator). */
8732 struct c_declarator *
8733 build_id_declarator (tree ident)
8735 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8737 ret->declarator = 0;
8739 /* Default value - may get reset to a more precise location. */
8740 ret->id_loc = input_location;
8744 /* Return something to represent absolute declarators containing a *.
8745 TARGET is the absolute declarator that the * contains.
8746 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8747 to apply to the pointer type. */
8749 struct c_declarator *
8750 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
8751 struct c_declarator *target)
8755 struct c_declarator *itarget = target;
8756 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8757 if (type_quals_attrs)
8759 attrs = type_quals_attrs->attrs;
8760 quals = quals_from_declspecs (type_quals_attrs);
8761 if (attrs != NULL_TREE)
8762 itarget = build_attrs_declarator (attrs, target);
8764 ret->kind = cdk_pointer;
8765 ret->declarator = itarget;
8766 ret->u.pointer_quals = quals;
8770 /* Return a pointer to a structure for an empty list of declaration
8773 struct c_declspecs *
8774 build_null_declspecs (void)
8776 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
8781 ret->align_log = -1;
8782 ret->typespec_word = cts_none;
8783 ret->storage_class = csc_none;
8784 ret->expr_const_operands = true;
8785 ret->declspecs_seen_p = false;
8786 ret->typespec_kind = ctsk_none;
8787 ret->non_sc_seen_p = false;
8788 ret->typedef_p = false;
8789 ret->explicit_signed_p = false;
8790 ret->deprecated_p = false;
8791 ret->default_int_p = false;
8792 ret->long_p = false;
8793 ret->long_long_p = false;
8794 ret->short_p = false;
8795 ret->signed_p = false;
8796 ret->unsigned_p = false;
8797 ret->complex_p = false;
8798 ret->inline_p = false;
8799 ret->noreturn_p = false;
8800 ret->thread_p = false;
8801 ret->const_p = false;
8802 ret->volatile_p = false;
8803 ret->restrict_p = false;
8804 ret->saturating_p = false;
8805 ret->alignas_p = false;
8806 ret->address_space = ADDR_SPACE_GENERIC;
8810 /* Add the address space ADDRSPACE to the declaration specifiers
8811 SPECS, returning SPECS. */
8813 struct c_declspecs *
8814 declspecs_add_addrspace (struct c_declspecs *specs, addr_space_t as)
8816 specs->non_sc_seen_p = true;
8817 specs->declspecs_seen_p = true;
8819 if (!ADDR_SPACE_GENERIC_P (specs->address_space)
8820 && specs->address_space != as)
8821 error ("incompatible address space qualifiers %qs and %qs",
8822 c_addr_space_name (as),
8823 c_addr_space_name (specs->address_space));
8825 specs->address_space = as;
8829 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8832 struct c_declspecs *
8833 declspecs_add_qual (struct c_declspecs *specs, tree qual)
8837 specs->non_sc_seen_p = true;
8838 specs->declspecs_seen_p = true;
8839 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
8840 && C_IS_RESERVED_WORD (qual));
8841 i = C_RID_CODE (qual);
8845 dupe = specs->const_p;
8846 specs->const_p = true;
8849 dupe = specs->volatile_p;
8850 specs->volatile_p = true;
8853 dupe = specs->restrict_p;
8854 specs->restrict_p = true;
8859 if (dupe && !flag_isoc99)
8860 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
8864 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8867 struct c_declspecs *
8868 declspecs_add_type (location_t loc, struct c_declspecs *specs,
8869 struct c_typespec spec)
8871 tree type = spec.spec;
8872 specs->non_sc_seen_p = true;
8873 specs->declspecs_seen_p = true;
8874 specs->typespec_kind = spec.kind;
8875 if (TREE_DEPRECATED (type))
8876 specs->deprecated_p = true;
8878 /* Handle type specifier keywords. */
8879 if (TREE_CODE (type) == IDENTIFIER_NODE
8880 && C_IS_RESERVED_WORD (type)
8881 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
8883 enum rid i = C_RID_CODE (type);
8886 error_at (loc, "two or more data types in declaration specifiers");
8889 if ((int) i <= (int) RID_LAST_MODIFIER)
8891 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8896 if (specs->long_long_p)
8898 error_at (loc, "%<long long long%> is too long for GCC");
8903 if (specs->typespec_word == cts_double)
8906 ("both %<long long%> and %<double%> in "
8907 "declaration specifiers"));
8910 pedwarn_c90 (loc, OPT_Wlong_long,
8911 "ISO C90 does not support %<long long%>");
8912 specs->long_long_p = 1;
8917 ("both %<long%> and %<short%> in "
8918 "declaration specifiers"));
8919 else if (specs->typespec_word == cts_void)
8921 ("both %<long%> and %<void%> in "
8922 "declaration specifiers"));
8923 else if (specs->typespec_word == cts_int128)
8925 ("both %<long%> and %<__int128%> in "
8926 "declaration specifiers"));
8927 else if (specs->typespec_word == cts_bool)
8929 ("both %<long%> and %<_Bool%> in "
8930 "declaration specifiers"));
8931 else if (specs->typespec_word == cts_char)
8933 ("both %<long%> and %<char%> in "
8934 "declaration specifiers"));
8935 else if (specs->typespec_word == cts_float)
8937 ("both %<long%> and %<float%> in "
8938 "declaration specifiers"));
8939 else if (specs->typespec_word == cts_dfloat32)
8941 ("both %<long%> and %<_Decimal32%> in "
8942 "declaration specifiers"));
8943 else if (specs->typespec_word == cts_dfloat64)
8945 ("both %<long%> and %<_Decimal64%> in "
8946 "declaration specifiers"));
8947 else if (specs->typespec_word == cts_dfloat128)
8949 ("both %<long%> and %<_Decimal128%> in "
8950 "declaration specifiers"));
8952 specs->long_p = true;
8955 dupe = specs->short_p;
8958 ("both %<long%> and %<short%> in "
8959 "declaration specifiers"));
8960 else if (specs->typespec_word == cts_void)
8962 ("both %<short%> and %<void%> in "
8963 "declaration specifiers"));
8964 else if (specs->typespec_word == cts_int128)
8966 ("both %<short%> and %<__int128%> in "
8967 "declaration specifiers"));
8968 else if (specs->typespec_word == cts_bool)
8970 ("both %<short%> and %<_Bool%> in "
8971 "declaration specifiers"));
8972 else if (specs->typespec_word == cts_char)
8974 ("both %<short%> and %<char%> in "
8975 "declaration specifiers"));
8976 else if (specs->typespec_word == cts_float)
8978 ("both %<short%> and %<float%> in "
8979 "declaration specifiers"));
8980 else if (specs->typespec_word == cts_double)
8982 ("both %<short%> and %<double%> in "
8983 "declaration specifiers"));
8984 else if (specs->typespec_word == cts_dfloat32)
8986 ("both %<short%> and %<_Decimal32%> in "
8987 "declaration specifiers"));
8988 else if (specs->typespec_word == cts_dfloat64)
8990 ("both %<short%> and %<_Decimal64%> in "
8991 "declaration specifiers"));
8992 else if (specs->typespec_word == cts_dfloat128)
8994 ("both %<short%> and %<_Decimal128%> in "
8995 "declaration specifiers"));
8997 specs->short_p = true;
9000 dupe = specs->signed_p;
9001 if (specs->unsigned_p)
9003 ("both %<signed%> and %<unsigned%> in "
9004 "declaration specifiers"));
9005 else if (specs->typespec_word == cts_void)
9007 ("both %<signed%> and %<void%> in "
9008 "declaration specifiers"));
9009 else if (specs->typespec_word == cts_bool)
9011 ("both %<signed%> and %<_Bool%> in "
9012 "declaration specifiers"));
9013 else if (specs->typespec_word == cts_float)
9015 ("both %<signed%> and %<float%> in "
9016 "declaration specifiers"));
9017 else if (specs->typespec_word == cts_double)
9019 ("both %<signed%> and %<double%> in "
9020 "declaration specifiers"));
9021 else if (specs->typespec_word == cts_dfloat32)
9023 ("both %<signed%> and %<_Decimal32%> in "
9024 "declaration specifiers"));
9025 else if (specs->typespec_word == cts_dfloat64)
9027 ("both %<signed%> and %<_Decimal64%> in "
9028 "declaration specifiers"));
9029 else if (specs->typespec_word == cts_dfloat128)
9031 ("both %<signed%> and %<_Decimal128%> in "
9032 "declaration specifiers"));
9034 specs->signed_p = true;
9037 dupe = specs->unsigned_p;
9038 if (specs->signed_p)
9040 ("both %<signed%> and %<unsigned%> in "
9041 "declaration specifiers"));
9042 else if (specs->typespec_word == cts_void)
9044 ("both %<unsigned%> and %<void%> in "
9045 "declaration specifiers"));
9046 else if (specs->typespec_word == cts_bool)
9048 ("both %<unsigned%> and %<_Bool%> in "
9049 "declaration specifiers"));
9050 else if (specs->typespec_word == cts_float)
9052 ("both %<unsigned%> and %<float%> in "
9053 "declaration specifiers"));
9054 else if (specs->typespec_word == cts_double)
9056 ("both %<unsigned%> and %<double%> in "
9057 "declaration specifiers"));
9058 else if (specs->typespec_word == cts_dfloat32)
9060 ("both %<unsigned%> and %<_Decimal32%> in "
9061 "declaration specifiers"));
9062 else if (specs->typespec_word == cts_dfloat64)
9064 ("both %<unsigned%> and %<_Decimal64%> in "
9065 "declaration specifiers"));
9066 else if (specs->typespec_word == cts_dfloat128)
9068 ("both %<unsigned%> and %<_Decimal128%> in "
9069 "declaration specifiers"));
9071 specs->unsigned_p = true;
9074 dupe = specs->complex_p;
9075 if (!flag_isoc99 && !in_system_header)
9076 pedwarn (loc, OPT_pedantic,
9077 "ISO C90 does not support complex types");
9078 if (specs->typespec_word == cts_void)
9080 ("both %<complex%> and %<void%> in "
9081 "declaration specifiers"));
9082 else if (specs->typespec_word == cts_bool)
9084 ("both %<complex%> and %<_Bool%> in "
9085 "declaration specifiers"));
9086 else if (specs->typespec_word == cts_dfloat32)
9088 ("both %<complex%> and %<_Decimal32%> in "
9089 "declaration specifiers"));
9090 else if (specs->typespec_word == cts_dfloat64)
9092 ("both %<complex%> and %<_Decimal64%> in "
9093 "declaration specifiers"));
9094 else if (specs->typespec_word == cts_dfloat128)
9096 ("both %<complex%> and %<_Decimal128%> in "
9097 "declaration specifiers"));
9098 else if (specs->typespec_word == cts_fract)
9100 ("both %<complex%> and %<_Fract%> in "
9101 "declaration specifiers"));
9102 else if (specs->typespec_word == cts_accum)
9104 ("both %<complex%> and %<_Accum%> in "
9105 "declaration specifiers"));
9106 else if (specs->saturating_p)
9108 ("both %<complex%> and %<_Sat%> in "
9109 "declaration specifiers"));
9111 specs->complex_p = true;
9114 dupe = specs->saturating_p;
9115 pedwarn (loc, OPT_pedantic,
9116 "ISO C does not support saturating types");
9117 if (specs->typespec_word == cts_int128)
9120 ("both %<_Sat%> and %<__int128%> in "
9121 "declaration specifiers"));
9123 else if (specs->typespec_word == cts_void)
9125 ("both %<_Sat%> and %<void%> in "
9126 "declaration specifiers"));
9127 else if (specs->typespec_word == cts_bool)
9129 ("both %<_Sat%> and %<_Bool%> in "
9130 "declaration specifiers"));
9131 else if (specs->typespec_word == cts_char)
9133 ("both %<_Sat%> and %<char%> in "
9134 "declaration specifiers"));
9135 else if (specs->typespec_word == cts_int)
9137 ("both %<_Sat%> and %<int%> in "
9138 "declaration specifiers"));
9139 else if (specs->typespec_word == cts_float)
9141 ("both %<_Sat%> and %<float%> in "
9142 "declaration specifiers"));
9143 else if (specs->typespec_word == cts_double)
9145 ("both %<_Sat%> and %<double%> in "
9146 "declaration specifiers"));
9147 else if (specs->typespec_word == cts_dfloat32)
9149 ("both %<_Sat%> and %<_Decimal32%> in "
9150 "declaration specifiers"));
9151 else if (specs->typespec_word == cts_dfloat64)
9153 ("both %<_Sat%> and %<_Decimal64%> in "
9154 "declaration specifiers"));
9155 else if (specs->typespec_word == cts_dfloat128)
9157 ("both %<_Sat%> and %<_Decimal128%> in "
9158 "declaration specifiers"));
9159 else if (specs->complex_p)
9161 ("both %<_Sat%> and %<complex%> in "
9162 "declaration specifiers"));
9164 specs->saturating_p = true;
9171 error_at (loc, "duplicate %qE", type);
9177 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9178 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
9179 if (specs->typespec_word != cts_none)
9182 "two or more data types in declaration specifiers");
9188 if (int128_integer_type_node == NULL_TREE)
9190 error_at (loc, "%<__int128%> is not supported for this target");
9193 if (!in_system_header)
9194 pedwarn (loc, OPT_pedantic,
9195 "ISO C does not support %<__int128%> type");
9199 ("both %<__int128%> and %<long%> in "
9200 "declaration specifiers"));
9201 else if (specs->saturating_p)
9203 ("both %<_Sat%> and %<__int128%> in "
9204 "declaration specifiers"));
9205 else if (specs->short_p)
9207 ("both %<__int128%> and %<short%> in "
9208 "declaration specifiers"));
9210 specs->typespec_word = cts_int128;
9215 ("both %<long%> and %<void%> in "
9216 "declaration specifiers"));
9217 else if (specs->short_p)
9219 ("both %<short%> and %<void%> in "
9220 "declaration specifiers"));
9221 else if (specs->signed_p)
9223 ("both %<signed%> and %<void%> in "
9224 "declaration specifiers"));
9225 else if (specs->unsigned_p)
9227 ("both %<unsigned%> and %<void%> in "
9228 "declaration specifiers"));
9229 else if (specs->complex_p)
9231 ("both %<complex%> and %<void%> in "
9232 "declaration specifiers"));
9233 else if (specs->saturating_p)
9235 ("both %<_Sat%> and %<void%> in "
9236 "declaration specifiers"));
9238 specs->typespec_word = cts_void;
9243 ("both %<long%> and %<_Bool%> in "
9244 "declaration specifiers"));
9245 else if (specs->short_p)
9247 ("both %<short%> and %<_Bool%> in "
9248 "declaration specifiers"));
9249 else if (specs->signed_p)
9251 ("both %<signed%> and %<_Bool%> in "
9252 "declaration specifiers"));
9253 else if (specs->unsigned_p)
9255 ("both %<unsigned%> and %<_Bool%> in "
9256 "declaration specifiers"));
9257 else if (specs->complex_p)
9259 ("both %<complex%> and %<_Bool%> in "
9260 "declaration specifiers"));
9261 else if (specs->saturating_p)
9263 ("both %<_Sat%> and %<_Bool%> in "
9264 "declaration specifiers"));
9266 specs->typespec_word = cts_bool;
9271 ("both %<long%> and %<char%> in "
9272 "declaration specifiers"));
9273 else if (specs->short_p)
9275 ("both %<short%> and %<char%> in "
9276 "declaration specifiers"));
9277 else if (specs->saturating_p)
9279 ("both %<_Sat%> and %<char%> in "
9280 "declaration specifiers"));
9282 specs->typespec_word = cts_char;
9285 if (specs->saturating_p)
9287 ("both %<_Sat%> and %<int%> in "
9288 "declaration specifiers"));
9290 specs->typespec_word = cts_int;
9295 ("both %<long%> and %<float%> in "
9296 "declaration specifiers"));
9297 else if (specs->short_p)
9299 ("both %<short%> and %<float%> in "
9300 "declaration specifiers"));
9301 else if (specs->signed_p)
9303 ("both %<signed%> and %<float%> in "
9304 "declaration specifiers"));
9305 else if (specs->unsigned_p)
9307 ("both %<unsigned%> and %<float%> in "
9308 "declaration specifiers"));
9309 else if (specs->saturating_p)
9311 ("both %<_Sat%> and %<float%> in "
9312 "declaration specifiers"));
9314 specs->typespec_word = cts_float;
9317 if (specs->long_long_p)
9319 ("both %<long long%> and %<double%> in "
9320 "declaration specifiers"));
9321 else if (specs->short_p)
9323 ("both %<short%> and %<double%> in "
9324 "declaration specifiers"));
9325 else if (specs->signed_p)
9327 ("both %<signed%> and %<double%> in "
9328 "declaration specifiers"));
9329 else if (specs->unsigned_p)
9331 ("both %<unsigned%> and %<double%> in "
9332 "declaration specifiers"));
9333 else if (specs->saturating_p)
9335 ("both %<_Sat%> and %<double%> in "
9336 "declaration specifiers"));
9338 specs->typespec_word = cts_double;
9345 if (i == RID_DFLOAT32)
9347 else if (i == RID_DFLOAT64)
9350 str = "_Decimal128";
9351 if (specs->long_long_p)
9353 ("both %<long long%> and %<%s%> in "
9354 "declaration specifiers"),
9358 ("both %<long%> and %<%s%> in "
9359 "declaration specifiers"),
9361 else if (specs->short_p)
9363 ("both %<short%> and %<%s%> in "
9364 "declaration specifiers"),
9366 else if (specs->signed_p)
9368 ("both %<signed%> and %<%s%> in "
9369 "declaration specifiers"),
9371 else if (specs->unsigned_p)
9373 ("both %<unsigned%> and %<%s%> in "
9374 "declaration specifiers"),
9376 else if (specs->complex_p)
9378 ("both %<complex%> and %<%s%> in "
9379 "declaration specifiers"),
9381 else if (specs->saturating_p)
9383 ("both %<_Sat%> and %<%s%> in "
9384 "declaration specifiers"),
9386 else if (i == RID_DFLOAT32)
9387 specs->typespec_word = cts_dfloat32;
9388 else if (i == RID_DFLOAT64)
9389 specs->typespec_word = cts_dfloat64;
9391 specs->typespec_word = cts_dfloat128;
9393 if (!targetm.decimal_float_supported_p ())
9395 ("decimal floating point not supported "
9396 "for this target"));
9397 pedwarn (loc, OPT_pedantic,
9398 "ISO C does not support decimal floating point");
9408 if (specs->complex_p)
9410 ("both %<complex%> and %<%s%> in "
9411 "declaration specifiers"),
9413 else if (i == RID_FRACT)
9414 specs->typespec_word = cts_fract;
9416 specs->typespec_word = cts_accum;
9418 if (!targetm.fixed_point_supported_p ())
9420 "fixed-point types not supported for this target");
9421 pedwarn (loc, OPT_pedantic,
9422 "ISO C does not support fixed-point types");
9425 /* ObjC reserved word "id", handled below. */
9431 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9432 form of ObjC type, cases such as "int" and "long" being handled
9433 above), a TYPE (struct, union, enum and typeof specifiers) or an
9434 ERROR_MARK. In none of these cases may there have previously
9435 been any type specifiers. */
9436 if (specs->type || specs->typespec_word != cts_none
9437 || specs->long_p || specs->short_p || specs->signed_p
9438 || specs->unsigned_p || specs->complex_p)
9439 error_at (loc, "two or more data types in declaration specifiers");
9440 else if (TREE_CODE (type) == TYPE_DECL)
9442 if (TREE_TYPE (type) == error_mark_node)
9443 ; /* Allow the type to default to int to avoid cascading errors. */
9446 specs->type = TREE_TYPE (type);
9447 specs->decl_attr = DECL_ATTRIBUTES (type);
9448 specs->typedef_p = true;
9449 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
9451 /* If this typedef name is defined in a struct, then a C++
9452 lookup would return a different value. */
9454 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
9455 warning_at (loc, OPT_Wc___compat,
9456 "C++ lookup of %qD would return a field, not a type",
9459 /* If we are parsing a struct, record that a struct field
9461 if (warn_cxx_compat && struct_parse_info != NULL)
9462 VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type);
9465 else if (TREE_CODE (type) == IDENTIFIER_NODE)
9467 tree t = lookup_name (type);
9468 if (!t || TREE_CODE (t) != TYPE_DECL)
9469 error_at (loc, "%qE fails to be a typedef or built in type", type);
9470 else if (TREE_TYPE (t) == error_mark_node)
9473 specs->type = TREE_TYPE (t);
9477 if (TREE_CODE (type) != ERROR_MARK && spec.kind == ctsk_typeof)
9479 specs->typedef_p = true;
9483 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
9484 specs->expr, spec.expr);
9486 specs->expr = spec.expr;
9487 specs->expr_const_operands &= spec.expr_const_operands;
9496 /* Add the storage class specifier or function specifier SCSPEC to the
9497 declaration specifiers SPECS, returning SPECS. */
9499 struct c_declspecs *
9500 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
9503 enum c_storage_class n = csc_none;
9505 specs->declspecs_seen_p = true;
9506 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
9507 && C_IS_RESERVED_WORD (scspec));
9508 i = C_RID_CODE (scspec);
9509 if (specs->non_sc_seen_p)
9510 warning (OPT_Wold_style_declaration,
9511 "%qE is not at beginning of declaration", scspec);
9515 /* C99 permits duplicate inline. Although of doubtful utility,
9516 it seems simplest to permit it in gnu89 mode as well, as
9517 there is also little utility in maintaining this as a
9518 difference between gnu89 and C99 inline. */
9520 specs->inline_p = true;
9523 /* Duplicate _Noreturn is permitted. */
9525 specs->noreturn_p = true;
9528 dupe = specs->thread_p;
9529 if (specs->storage_class == csc_auto)
9530 error ("%<__thread%> used with %<auto%>");
9531 else if (specs->storage_class == csc_register)
9532 error ("%<__thread%> used with %<register%>");
9533 else if (specs->storage_class == csc_typedef)
9534 error ("%<__thread%> used with %<typedef%>");
9536 specs->thread_p = true;
9543 /* Diagnose "__thread extern". */
9544 if (specs->thread_p)
9545 error ("%<__thread%> before %<extern%>");
9552 /* Diagnose "__thread static". */
9553 if (specs->thread_p)
9554 error ("%<__thread%> before %<static%>");
9562 if (n != csc_none && n == specs->storage_class)
9565 error ("duplicate %qE", scspec);
9568 if (specs->storage_class != csc_none && n != specs->storage_class)
9570 error ("multiple storage classes in declaration specifiers");
9574 specs->storage_class = n;
9575 if (n != csc_extern && n != csc_static && specs->thread_p)
9577 error ("%<__thread%> used with %qE", scspec);
9578 specs->thread_p = false;
9585 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9588 struct c_declspecs *
9589 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
9591 specs->attrs = chainon (attrs, specs->attrs);
9592 specs->declspecs_seen_p = true;
9596 /* Add an _Alignas specifier (expression ALIGN, or type whose
9597 alignment is ALIGN) to the declaration specifiers SPECS, returning
9599 struct c_declspecs *
9600 declspecs_add_alignas (struct c_declspecs *specs, tree align)
9603 specs->alignas_p = true;
9604 if (align == error_mark_node)
9606 align_log = check_user_alignment (align, true);
9607 if (align_log > specs->align_log)
9608 specs->align_log = align_log;
9612 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9613 specifiers with any other type specifier to determine the resulting
9614 type. This is where ISO C checks on complex types are made, since
9615 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9618 struct c_declspecs *
9619 finish_declspecs (struct c_declspecs *specs)
9621 /* If a type was specified as a whole, we have no modifiers and are
9623 if (specs->type != NULL_TREE)
9625 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9626 && !specs->signed_p && !specs->unsigned_p
9627 && !specs->complex_p);
9629 /* Set a dummy type. */
9630 if (TREE_CODE (specs->type) == ERROR_MARK)
9631 specs->type = integer_type_node;
9635 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9636 has been specified, treat it as "int" unless "_Complex" is
9637 present and there are no other specifiers. If we just have
9638 "_Complex", it is equivalent to "_Complex double", but e.g.
9639 "_Complex short" is equivalent to "_Complex short int". */
9640 if (specs->typespec_word == cts_none)
9642 if (specs->saturating_p)
9644 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9645 if (!targetm.fixed_point_supported_p ())
9646 error ("fixed-point types not supported for this target");
9647 specs->typespec_word = cts_fract;
9649 else if (specs->long_p || specs->short_p
9650 || specs->signed_p || specs->unsigned_p)
9652 specs->typespec_word = cts_int;
9654 else if (specs->complex_p)
9656 specs->typespec_word = cts_double;
9657 pedwarn (input_location, OPT_pedantic,
9658 "ISO C does not support plain %<complex%> meaning "
9659 "%<double complex%>");
9663 specs->typespec_word = cts_int;
9664 specs->default_int_p = true;
9665 /* We don't diagnose this here because grokdeclarator will
9666 give more specific diagnostics according to whether it is
9667 a function definition. */
9671 /* If "signed" was specified, record this to distinguish "int" and
9672 "signed int" in the case of a bit-field with
9673 -funsigned-bitfields. */
9674 specs->explicit_signed_p = specs->signed_p;
9676 /* Now compute the actual type. */
9677 switch (specs->typespec_word)
9680 gcc_assert (!specs->long_p && !specs->short_p
9681 && !specs->signed_p && !specs->unsigned_p
9682 && !specs->complex_p);
9683 specs->type = void_type_node;
9686 gcc_assert (!specs->long_p && !specs->short_p
9687 && !specs->signed_p && !specs->unsigned_p
9688 && !specs->complex_p);
9689 specs->type = boolean_type_node;
9692 gcc_assert (!specs->long_p && !specs->short_p);
9693 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9694 if (specs->signed_p)
9695 specs->type = signed_char_type_node;
9696 else if (specs->unsigned_p)
9697 specs->type = unsigned_char_type_node;
9699 specs->type = char_type_node;
9700 if (specs->complex_p)
9702 pedwarn (input_location, OPT_pedantic,
9703 "ISO C does not support complex integer types");
9704 specs->type = build_complex_type (specs->type);
9708 gcc_assert (!specs->long_p && !specs->short_p && !specs->long_long_p);
9709 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9710 specs->type = (specs->unsigned_p
9711 ? int128_unsigned_type_node
9712 : int128_integer_type_node);
9713 if (specs->complex_p)
9715 pedwarn (input_location, OPT_pedantic,
9716 "ISO C does not support complex integer types");
9717 specs->type = build_complex_type (specs->type);
9721 gcc_assert (!(specs->long_p && specs->short_p));
9722 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9723 if (specs->long_long_p)
9724 specs->type = (specs->unsigned_p
9725 ? long_long_unsigned_type_node
9726 : long_long_integer_type_node);
9727 else if (specs->long_p)
9728 specs->type = (specs->unsigned_p
9729 ? long_unsigned_type_node
9730 : long_integer_type_node);
9731 else if (specs->short_p)
9732 specs->type = (specs->unsigned_p
9733 ? short_unsigned_type_node
9734 : short_integer_type_node);
9736 specs->type = (specs->unsigned_p
9737 ? unsigned_type_node
9738 : integer_type_node);
9739 if (specs->complex_p)
9741 pedwarn (input_location, OPT_pedantic,
9742 "ISO C does not support complex integer types");
9743 specs->type = build_complex_type (specs->type);
9747 gcc_assert (!specs->long_p && !specs->short_p
9748 && !specs->signed_p && !specs->unsigned_p);
9749 specs->type = (specs->complex_p
9750 ? complex_float_type_node
9754 gcc_assert (!specs->long_long_p && !specs->short_p
9755 && !specs->signed_p && !specs->unsigned_p);
9758 specs->type = (specs->complex_p
9759 ? complex_long_double_type_node
9760 : long_double_type_node);
9764 specs->type = (specs->complex_p
9765 ? complex_double_type_node
9766 : double_type_node);
9772 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9773 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
9774 if (specs->typespec_word == cts_dfloat32)
9775 specs->type = dfloat32_type_node;
9776 else if (specs->typespec_word == cts_dfloat64)
9777 specs->type = dfloat64_type_node;
9779 specs->type = dfloat128_type_node;
9782 gcc_assert (!specs->complex_p);
9783 if (!targetm.fixed_point_supported_p ())
9784 specs->type = integer_type_node;
9785 else if (specs->saturating_p)
9787 if (specs->long_long_p)
9788 specs->type = specs->unsigned_p
9789 ? sat_unsigned_long_long_fract_type_node
9790 : sat_long_long_fract_type_node;
9791 else if (specs->long_p)
9792 specs->type = specs->unsigned_p
9793 ? sat_unsigned_long_fract_type_node
9794 : sat_long_fract_type_node;
9795 else if (specs->short_p)
9796 specs->type = specs->unsigned_p
9797 ? sat_unsigned_short_fract_type_node
9798 : sat_short_fract_type_node;
9800 specs->type = specs->unsigned_p
9801 ? sat_unsigned_fract_type_node
9802 : sat_fract_type_node;
9806 if (specs->long_long_p)
9807 specs->type = specs->unsigned_p
9808 ? unsigned_long_long_fract_type_node
9809 : long_long_fract_type_node;
9810 else if (specs->long_p)
9811 specs->type = specs->unsigned_p
9812 ? unsigned_long_fract_type_node
9813 : long_fract_type_node;
9814 else if (specs->short_p)
9815 specs->type = specs->unsigned_p
9816 ? unsigned_short_fract_type_node
9817 : short_fract_type_node;
9819 specs->type = specs->unsigned_p
9820 ? unsigned_fract_type_node
9825 gcc_assert (!specs->complex_p);
9826 if (!targetm.fixed_point_supported_p ())
9827 specs->type = integer_type_node;
9828 else if (specs->saturating_p)
9830 if (specs->long_long_p)
9831 specs->type = specs->unsigned_p
9832 ? sat_unsigned_long_long_accum_type_node
9833 : sat_long_long_accum_type_node;
9834 else if (specs->long_p)
9835 specs->type = specs->unsigned_p
9836 ? sat_unsigned_long_accum_type_node
9837 : sat_long_accum_type_node;
9838 else if (specs->short_p)
9839 specs->type = specs->unsigned_p
9840 ? sat_unsigned_short_accum_type_node
9841 : sat_short_accum_type_node;
9843 specs->type = specs->unsigned_p
9844 ? sat_unsigned_accum_type_node
9845 : sat_accum_type_node;
9849 if (specs->long_long_p)
9850 specs->type = specs->unsigned_p
9851 ? unsigned_long_long_accum_type_node
9852 : long_long_accum_type_node;
9853 else if (specs->long_p)
9854 specs->type = specs->unsigned_p
9855 ? unsigned_long_accum_type_node
9856 : long_accum_type_node;
9857 else if (specs->short_p)
9858 specs->type = specs->unsigned_p
9859 ? unsigned_short_accum_type_node
9860 : short_accum_type_node;
9862 specs->type = specs->unsigned_p
9863 ? unsigned_accum_type_node
9874 /* A subroutine of c_write_global_declarations. Perform final processing
9875 on one file scope's declarations (or the external scope's declarations),
9879 c_write_global_declarations_1 (tree globals)
9884 /* Process the decls in the order they were written. */
9885 for (decl = globals; decl; decl = DECL_CHAIN (decl))
9887 /* Check for used but undefined static functions using the C
9888 standard's definition of "used", and set TREE_NO_WARNING so
9889 that check_global_declarations doesn't repeat the check. */
9890 if (TREE_CODE (decl) == FUNCTION_DECL
9891 && DECL_INITIAL (decl) == 0
9892 && DECL_EXTERNAL (decl)
9893 && !TREE_PUBLIC (decl)
9894 && C_DECL_USED (decl))
9896 pedwarn (input_location, 0, "%q+F used but never defined", decl);
9897 TREE_NO_WARNING (decl) = 1;
9900 wrapup_global_declaration_1 (decl);
9906 for (decl = globals; decl; decl = DECL_CHAIN (decl))
9907 reconsider |= wrapup_global_declaration_2 (decl);
9911 for (decl = globals; decl; decl = DECL_CHAIN (decl))
9912 check_global_declaration_1 (decl);
9915 /* A subroutine of c_write_global_declarations Emit debug information for each
9916 of the declarations in GLOBALS. */
9919 c_write_global_declarations_2 (tree globals)
9923 for (decl = globals; decl ; decl = DECL_CHAIN (decl))
9924 debug_hooks->global_decl (decl);
9927 /* Callback to collect a source_ref from a DECL. */
9930 collect_source_ref_cb (tree decl)
9932 if (!DECL_IS_BUILTIN (decl))
9933 collect_source_ref (LOCATION_FILE (decl_sloc (decl, false)));
9936 /* Preserve the external declarations scope across a garbage collect. */
9937 static GTY(()) tree ext_block;
9939 /* Collect all references relevant to SOURCE_FILE. */
9942 collect_all_refs (const char *source_file)
9947 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
9948 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t)), source_file);
9950 collect_ada_nodes (BLOCK_VARS (ext_block), source_file);
9953 /* Iterate over all global declarations and call CALLBACK. */
9956 for_each_global_decl (void (*callback) (tree decl))
9963 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
9965 decls = DECL_INITIAL (t);
9966 for (decl = BLOCK_VARS (decls); decl; decl = TREE_CHAIN (decl))
9970 for (decl = BLOCK_VARS (ext_block); decl; decl = TREE_CHAIN (decl))
9975 c_write_global_declarations (void)
9980 /* We don't want to do this if generating a PCH. */
9984 timevar_start (TV_PHASE_DEFERRED);
9986 /* Do the Objective-C stuff. This is where all the Objective-C
9987 module stuff gets generated (symtab, class/protocol/selector
9989 if (c_dialect_objc ())
9990 objc_write_global_declarations ();
9992 /* Close the external scope. */
9993 ext_block = pop_scope ();
9995 gcc_assert (!current_scope);
9997 /* Handle -fdump-ada-spec[-slim]. */
9998 if (dump_enabled_p (TDI_ada))
10000 /* Build a table of files to generate specs for */
10001 if (get_dump_file_info (TDI_ada)->flags & TDF_SLIM)
10002 collect_source_ref (main_input_filename);
10004 for_each_global_decl (collect_source_ref_cb);
10006 dump_ada_specs (collect_all_refs, NULL);
10011 tree tmp = BLOCK_VARS (ext_block);
10013 FILE * stream = dump_begin (TDI_tu, &flags);
10016 dump_node (tmp, flags & ~TDF_SLIM, stream);
10017 dump_end (TDI_tu, stream);
10021 /* Process all file scopes in this compilation, and the external_scope,
10022 through wrapup_global_declarations and check_global_declarations. */
10023 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
10024 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
10025 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
10027 timevar_stop (TV_PHASE_DEFERRED);
10028 timevar_start (TV_PHASE_CGRAPH);
10030 /* We're done parsing; proceed to optimize and emit assembly.
10031 FIXME: shouldn't be the front end's responsibility to call this. */
10032 cgraph_finalize_compilation_unit ();
10034 timevar_stop (TV_PHASE_CGRAPH);
10035 timevar_start (TV_PHASE_DBGINFO);
10037 /* After cgraph has had a chance to emit everything that's going to
10038 be emitted, output debug information for globals. */
10039 if (!seen_error ())
10041 timevar_push (TV_SYMOUT);
10042 FOR_EACH_VEC_ELT (tree, all_translation_units, i, t)
10043 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
10044 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
10045 timevar_pop (TV_SYMOUT);
10049 timevar_stop (TV_PHASE_DBGINFO);
10052 /* Register reserved keyword WORD as qualifier for address space AS. */
10055 c_register_addr_space (const char *word, addr_space_t as)
10057 int rid = RID_FIRST_ADDR_SPACE + as;
10060 /* Address space qualifiers are only supported
10061 in C with GNU extensions enabled. */
10062 if (c_dialect_objc () || flag_no_asm)
10065 id = get_identifier (word);
10066 C_SET_RID_CODE (id, rid);
10067 C_IS_RESERVED_WORD (id) = 1;
10068 ridpointers [rid] = id;
10071 #include "gt-c-decl.h"