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
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"
54 #include "langhooks.h"
55 #include "tree-mudflap.h"
57 #include "tree-iterator.h"
58 #include "diagnostic.h"
59 #include "tree-dump.h"
64 #include "langhooks-def.h"
65 #include "pointer-set.h"
69 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
71 { NORMAL, /* Ordinary declaration */
72 FUNCDEF, /* Function definition */
73 PARM, /* Declaration of parm before function body */
74 FIELD, /* Declaration inside struct or union */
75 TYPENAME}; /* Typename (inside cast or sizeof) */
77 /* States indicating how grokdeclarator() should handle declspecs marked
78 with __attribute__((deprecated)). An object declared as
79 __attribute__((deprecated)) suppresses warnings of uses of other
82 enum deprecated_states {
88 /* Nonzero if we have seen an invalid cross reference
89 to a struct, union, or enum, but not yet printed the message. */
90 tree pending_invalid_xref;
92 /* File and line to appear in the eventual error message. */
93 location_t pending_invalid_xref_location;
95 /* The file and line that the prototype came from if this is an
96 old-style definition; used for diagnostics in
97 store_parm_decls_oldstyle. */
99 static location_t current_function_prototype_locus;
101 /* Whether this prototype was built-in. */
103 static bool current_function_prototype_built_in;
105 /* The argument type information of this prototype. */
107 static tree current_function_prototype_arg_types;
109 /* The argument information structure for the function currently being
112 static struct c_arg_info *current_function_arg_info;
114 /* The obstack on which parser and related data structures, which are
115 not live beyond their top-level declaration or definition, are
117 struct obstack parser_obstack;
119 /* The current statement tree. */
121 static GTY(()) struct stmt_tree_s c_stmt_tree;
123 /* State saving variables. */
127 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
128 included in this invocation. Note that the current translation
129 unit is not included in this list. */
131 static GTY(()) tree all_translation_units;
133 /* A list of decls to be made automatically visible in each file scope. */
134 static GTY(()) tree visible_builtins;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a return statement that specifies a return value is seen. */
139 int current_function_returns_value;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a return statement with no argument is seen. */
144 int current_function_returns_null;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a call to a noreturn function is seen. */
149 int current_function_returns_abnormally;
151 /* Set to nonzero by `grokdeclarator' for a function
152 whose return type is defaulted, if warnings for this are desired. */
154 static int warn_about_return_type;
156 /* Nonzero when the current toplevel function contains a declaration
157 of a nested function which is never defined. */
159 static bool undef_nested_function;
161 /* True means global_bindings_p should return false even if the scope stack
162 says we are in file scope. */
163 bool c_override_global_bindings_to_false;
166 /* Each c_binding structure describes one binding of an identifier to
167 a decl. All the decls in a scope - irrespective of namespace - are
168 chained together by the ->prev field, which (as the name implies)
169 runs in reverse order. All the decls in a given namespace bound to
170 a given identifier are chained by the ->shadowed field, which runs
171 from inner to outer scopes.
173 The ->decl field usually points to a DECL node, but there are two
174 exceptions. In the namespace of type tags, the bound entity is a
175 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
176 identifier is encountered, it is bound to error_mark_node to
177 suppress further errors about that identifier in the current
180 The ->u.type field stores the type of the declaration in this scope;
181 if NULL, the type is the type of the ->decl field. This is only of
182 relevance for objects with external or internal linkage which may
183 be redeclared in inner scopes, forming composite types that only
184 persist for the duration of those scopes. In the external scope,
185 this stores the composite of all the types declared for this
186 object, visible or not. The ->inner_comp field (used only at file
187 scope) stores whether an incomplete array type at file scope was
188 completed at an inner scope to an array size other than 1.
190 The ->u.label field is used for labels. It points to a structure
191 which stores additional information used for warnings.
193 The depth field is copied from the scope structure that holds this
194 decl. It is used to preserve the proper ordering of the ->shadowed
195 field (see bind()) and also for a handful of special-case checks.
196 Finally, the invisible bit is true for a decl which should be
197 ignored for purposes of normal name lookup, and the nested bit is
198 true for a decl that's been bound a second time in an inner scope;
199 in all such cases, the binding in the outer scope will have its
200 invisible bit true. */
202 struct GTY((chain_next ("%h.prev"))) c_binding {
203 union GTY(()) { /* first so GTY desc can use decl */
204 tree GTY((tag ("0"))) type; /* the type in this scope */
205 struct c_label_vars * GTY((tag ("1"))) label; /* for warnings */
206 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u;
207 tree decl; /* the decl bound */
208 tree id; /* the identifier it's bound to */
209 struct c_binding *prev; /* the previous decl in this scope */
210 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
211 unsigned int depth : 28; /* depth of this scope */
212 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
213 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
214 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
215 BOOL_BITFIELD in_struct : 1; /* currently defined as struct field */
216 location_t locus; /* location for nested bindings */
218 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
219 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
220 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
221 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
223 #define I_SYMBOL_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
225 #define I_SYMBOL_DECL(node) \
226 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
228 #define I_TAG_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
230 #define I_TAG_DECL(node) \
231 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
233 #define I_LABEL_BINDING(node) \
234 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
235 #define I_LABEL_DECL(node) \
236 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
238 /* Each C symbol points to three linked lists of c_binding structures.
239 These describe the values of the identifier in the three different
240 namespaces defined by the language. */
242 struct GTY(()) lang_identifier {
243 struct c_common_identifier common_id;
244 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
245 struct c_binding *tag_binding; /* struct/union/enum tags */
246 struct c_binding *label_binding; /* labels */
249 /* Validate c-lang.c's assumptions. */
250 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
251 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
253 /* The resulting tree type. */
255 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
256 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))"))) lang_tree_node
258 union tree_node GTY ((tag ("0"),
259 desc ("tree_node_structure (&%h)")))
261 struct lang_identifier GTY ((tag ("1"))) identifier;
264 /* Track bindings and other things that matter for goto warnings. For
265 efficiency, we do not gather all the decls at the point of
266 definition. Instead, we point into the bindings structure. As
267 scopes are popped, we update these structures and gather the decls
268 that matter at that time. */
270 struct GTY(()) c_spot_bindings {
271 /* The currently open scope which holds bindings defined when the
272 label was defined or the goto statement was found. */
273 struct c_scope *scope;
274 /* The bindings in the scope field which were defined at the point
275 of the label or goto. This lets us look at older or newer
276 bindings in the scope, as appropriate. */
277 struct c_binding *bindings_in_scope;
278 /* The number of statement expressions that have started since this
279 label or goto statement was defined. This is zero if we are at
280 the same statement expression level. It is positive if we are in
281 a statement expression started since this spot. It is negative
282 if this spot was in a statement expression and we have left
285 /* Whether we started in a statement expression but are no longer in
286 it. This is set to true if stmt_exprs ever goes negative. */
290 /* This structure is used to keep track of bindings seen when a goto
291 statement is defined. This is only used if we see the goto
292 statement before we see the label. */
294 struct GTY(()) c_goto_bindings {
295 /* The location of the goto statement. */
297 /* The bindings of the goto statement. */
298 struct c_spot_bindings goto_bindings;
301 typedef struct c_goto_bindings *c_goto_bindings_p;
302 DEF_VEC_P(c_goto_bindings_p);
303 DEF_VEC_ALLOC_P(c_goto_bindings_p,gc);
305 /* The additional information we keep track of for a label binding.
306 These fields are updated as scopes are popped. */
308 struct GTY(()) c_label_vars {
309 /* The shadowed c_label_vars, when one label shadows another (which
310 can only happen using a __label__ declaration). */
311 struct c_label_vars *shadowed;
312 /* The bindings when the label was defined. */
313 struct c_spot_bindings label_bindings;
314 /* A list of decls that we care about: decls about which we should
315 warn if a goto branches to this label from later in the function.
316 Decls are added to this list as scopes are popped. We only add
317 the decls that matter. */
318 VEC(tree,gc) *decls_in_scope;
319 /* A list of goto statements to this label. This is only used for
320 goto statements seen before the label was defined, so that we can
321 issue appropriate warnings for them. */
322 VEC(c_goto_bindings_p,gc) *gotos;
325 /* Each c_scope structure describes the complete contents of one
326 scope. Four scopes are distinguished specially: the innermost or
327 current scope, the innermost function scope, the file scope (always
328 the second to outermost) and the outermost or external scope.
330 Most declarations are recorded in the current scope.
332 All normal label declarations are recorded in the innermost
333 function scope, as are bindings of undeclared identifiers to
334 error_mark_node. (GCC permits nested functions as an extension,
335 hence the 'innermost' qualifier.) Explicitly declared labels
336 (using the __label__ extension) appear in the current scope.
338 Being in the file scope (current_scope == file_scope) causes
339 special behavior in several places below. Also, under some
340 conditions the Objective-C front end records declarations in the
341 file scope even though that isn't the current scope.
343 All declarations with external linkage are recorded in the external
344 scope, even if they aren't visible there; this models the fact that
345 such declarations are visible to the entire program, and (with a
346 bit of cleverness, see pushdecl) allows diagnosis of some violations
347 of C99 6.2.2p7 and 6.2.7p2:
349 If, within the same translation unit, the same identifier appears
350 with both internal and external linkage, the behavior is
353 All declarations that refer to the same object or function shall
354 have compatible type; otherwise, the behavior is undefined.
356 Initially only the built-in declarations, which describe compiler
357 intrinsic functions plus a subset of the standard library, are in
360 The order of the blocks list matters, and it is frequently appended
361 to. To avoid having to walk all the way to the end of the list on
362 each insertion, or reverse the list later, we maintain a pointer to
363 the last list entry. (FIXME: It should be feasible to use a reversed
366 The bindings list is strictly in reverse order of declarations;
367 pop_scope relies on this. */
370 struct GTY((chain_next ("%h.outer"))) c_scope {
371 /* The scope containing this one. */
372 struct c_scope *outer;
374 /* The next outermost function scope. */
375 struct c_scope *outer_function;
377 /* All bindings in this scope. */
378 struct c_binding *bindings;
380 /* For each scope (except the global one), a chain of BLOCK nodes
381 for all the scopes that were entered and exited one level down. */
385 /* The depth of this scope. Used to keep the ->shadowed chain of
386 bindings sorted innermost to outermost. */
387 unsigned int depth : 28;
389 /* True if we are currently filling this scope with parameter
391 BOOL_BITFIELD parm_flag : 1;
393 /* True if we saw [*] in this scope. Used to give an error messages
394 if these appears in a function definition. */
395 BOOL_BITFIELD had_vla_unspec : 1;
397 /* True if we already complained about forward parameter decls
398 in this scope. This prevents double warnings on
399 foo (int a; int b; ...) */
400 BOOL_BITFIELD warned_forward_parm_decls : 1;
402 /* True if this is the outermost block scope of a function body.
403 This scope contains the parameters, the local variables declared
404 in the outermost block, and all the labels (except those in
405 nested functions, or declared at block scope with __label__). */
406 BOOL_BITFIELD function_body : 1;
408 /* True means make a BLOCK for this scope no matter what. */
409 BOOL_BITFIELD keep : 1;
411 /* True means that an unsuffixed float constant is _Decimal64. */
412 BOOL_BITFIELD float_const_decimal64 : 1;
414 /* True if this scope has any label bindings. This is used to speed
415 up searching for labels when popping scopes, particularly since
416 labels are normally only found at function scope. */
417 BOOL_BITFIELD has_label_bindings : 1;
420 /* The scope currently in effect. */
422 static GTY(()) struct c_scope *current_scope;
424 /* The innermost function scope. Ordinary (not explicitly declared)
425 labels, bindings to error_mark_node, and the lazily-created
426 bindings of __func__ and its friends get this scope. */
428 static GTY(()) struct c_scope *current_function_scope;
430 /* The C file scope. This is reset for each input translation unit. */
432 static GTY(()) struct c_scope *file_scope;
434 /* The outermost scope. This is used for all declarations with
435 external linkage, and only these, hence the name. */
437 static GTY(()) struct c_scope *external_scope;
439 /* A chain of c_scope structures awaiting reuse. */
441 static GTY((deletable)) struct c_scope *scope_freelist;
443 /* A chain of c_binding structures awaiting reuse. */
445 static GTY((deletable)) struct c_binding *binding_freelist;
447 /* Append VAR to LIST in scope SCOPE. */
448 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
449 struct c_scope *s_ = (scope); \
451 if (s_->list##_last) \
452 BLOCK_CHAIN (s_->list##_last) = d_; \
455 s_->list##_last = d_; \
458 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
459 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
460 struct c_scope *t_ = (tscope); \
461 struct c_scope *f_ = (fscope); \
463 BLOCK_CHAIN (t_->to##_last) = f_->from; \
466 t_->to##_last = f_->from##_last; \
469 /* A c_inline_static structure stores details of a static identifier
470 referenced in a definition of a function that may be an inline
471 definition if no subsequent declaration of that function uses
472 "extern" or does not use "inline". */
474 struct GTY((chain_next ("%h.next"))) c_inline_static {
475 /* The location for a diagnostic. */
478 /* The function that may be an inline definition. */
481 /* The object or function referenced. */
484 /* What sort of reference this is. */
485 enum c_inline_static_type type;
487 /* The next such structure or NULL. */
488 struct c_inline_static *next;
491 /* List of static identifiers used or referenced in functions that may
492 be inline definitions. */
493 static GTY(()) struct c_inline_static *c_inline_statics;
495 /* True means unconditionally make a BLOCK for the next scope pushed. */
497 static bool keep_next_level_flag;
499 /* True means the next call to push_scope will be the outermost scope
500 of a function body, so do not push a new scope, merely cease
501 expecting parameter decls. */
503 static bool next_is_function_body;
505 /* A VEC of pointers to c_binding structures. */
507 typedef struct c_binding *c_binding_ptr;
508 DEF_VEC_P(c_binding_ptr);
509 DEF_VEC_ALLOC_P(c_binding_ptr,heap);
511 /* Information that we keep for a struct or union while it is being
514 struct c_struct_parse_info
516 /* If warn_cxx_compat, a list of types defined within this
518 VEC(tree,heap) *struct_types;
519 /* If warn_cxx_compat, a list of field names which have bindings,
520 and which are defined in this struct, but which are not defined
521 in any enclosing struct. This is used to clear the in_struct
522 field of the c_bindings structure. */
523 VEC(c_binding_ptr,heap) *fields;
524 /* If warn_cxx_compat, a list of typedef names used when defining
525 fields in this struct. */
526 VEC(tree,heap) *typedefs_seen;
529 /* Information for the struct or union currently being parsed, or
530 NULL if not parsing a struct or union. */
531 static struct c_struct_parse_info *struct_parse_info;
533 /* Forward declarations. */
534 static tree lookup_name_in_scope (tree, struct c_scope *);
535 static tree c_make_fname_decl (location_t, tree, int);
536 static tree grokdeclarator (const struct c_declarator *,
537 struct c_declspecs *,
538 enum decl_context, bool, tree *, tree *, tree *,
539 bool *, enum deprecated_states);
540 static tree grokparms (struct c_arg_info *, bool);
541 static void layout_array_type (tree);
543 /* T is a statement. Add it to the statement-tree. This is the
544 C/ObjC version--C++ has a slightly different version of this
550 enum tree_code code = TREE_CODE (t);
552 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
554 if (!EXPR_HAS_LOCATION (t))
555 SET_EXPR_LOCATION (t, input_location);
558 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
559 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
561 /* Add T to the statement-tree. Non-side-effect statements need to be
562 recorded during statement expressions. */
563 append_to_statement_list_force (t, &cur_stmt_list);
570 c_print_identifier (FILE *file, tree node, int indent)
572 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
573 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
574 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
575 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
577 tree rid = ridpointers[C_RID_CODE (node)];
578 indent_to (file, indent + 4);
579 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
580 (void *) rid, IDENTIFIER_POINTER (rid));
584 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
585 which may be any of several kinds of DECL or TYPE or error_mark_node,
586 in the scope SCOPE. */
588 bind (tree name, tree decl, struct c_scope *scope, bool invisible,
589 bool nested, location_t locus)
591 struct c_binding *b, **here;
593 if (binding_freelist)
595 b = binding_freelist;
596 binding_freelist = b->prev;
599 b = GGC_NEW (struct c_binding);
604 b->depth = scope->depth;
605 b->invisible = invisible;
613 b->prev = scope->bindings;
619 switch (TREE_CODE (decl))
621 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
624 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
630 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
636 /* Locate the appropriate place in the chain of shadowed decls
637 to insert this binding. Normally, scope == current_scope and
638 this does nothing. */
639 while (*here && (*here)->depth > scope->depth)
640 here = &(*here)->shadowed;
646 /* Clear the binding structure B, stick it on the binding_freelist,
647 and return the former value of b->prev. This is used by pop_scope
648 and get_parm_info to iterate destructively over all the bindings
649 from a given scope. */
650 static struct c_binding *
651 free_binding_and_advance (struct c_binding *b)
653 struct c_binding *prev = b->prev;
655 memset (b, 0, sizeof (struct c_binding));
656 b->prev = binding_freelist;
657 binding_freelist = b;
662 /* Bind a label. Like bind, but skip fields which aren't used for
663 labels, and add the LABEL_VARS value. */
665 bind_label (tree name, tree label, struct c_scope *scope,
666 struct c_label_vars *label_vars)
670 bind (name, label, scope, /*invisible=*/false, /*nested=*/false,
673 scope->has_label_bindings = true;
676 gcc_assert (b->decl == label);
677 label_vars->shadowed = b->u.label;
678 b->u.label = label_vars;
681 /* Hook called at end of compilation to assume 1 elt
682 for a file-scope tentative array defn that wasn't complete before. */
685 c_finish_incomplete_decl (tree decl)
687 if (TREE_CODE (decl) == VAR_DECL)
689 tree type = TREE_TYPE (decl);
690 if (type != error_mark_node
691 && TREE_CODE (type) == ARRAY_TYPE
692 && !DECL_EXTERNAL (decl)
693 && TYPE_DOMAIN (type) == 0)
695 warning_at (DECL_SOURCE_LOCATION (decl),
696 0, "array %q+D assumed to have one element", decl);
698 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
700 layout_decl (decl, 0);
705 /* Record that inline function FUNC contains a reference (location
706 LOC) to static DECL (file-scope or function-local according to
710 record_inline_static (location_t loc, tree func, tree decl,
711 enum c_inline_static_type type)
713 struct c_inline_static *csi = GGC_NEW (struct c_inline_static);
715 csi->function = func;
716 csi->static_decl = decl;
718 csi->next = c_inline_statics;
719 c_inline_statics = csi;
722 /* Check for references to static declarations in inline functions at
723 the end of the translation unit and diagnose them if the functions
724 are still inline definitions. */
727 check_inline_statics (void)
729 struct c_inline_static *csi;
730 for (csi = c_inline_statics; csi; csi = csi->next)
732 if (DECL_EXTERNAL (csi->function))
736 pedwarn (csi->location, 0,
737 "%qD is static but used in inline function %qD "
738 "which is not static", csi->static_decl, csi->function);
741 pedwarn (csi->location, 0,
742 "%q+D is static but declared in inline function %qD "
743 "which is not static", csi->static_decl, csi->function);
749 c_inline_statics = NULL;
752 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
753 for the current state, otherwise set it to uninitialized. */
756 set_spot_bindings (struct c_spot_bindings *p, bool defining)
760 p->scope = current_scope;
761 p->bindings_in_scope = current_scope->bindings;
766 p->bindings_in_scope = NULL;
769 p->left_stmt_expr = false;
772 /* Return true if we will want to say something if a goto statement
776 decl_jump_unsafe (tree decl)
778 if (decl == error_mark_node || TREE_TYPE (decl) == error_mark_node)
781 /* Always warn about crossing variably modified types. */
782 if ((TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == TYPE_DECL)
783 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
786 /* Otherwise, only warn if -Wgoto-misses-init and this is an
787 initialized automatic decl. */
788 if (warn_jump_misses_init
789 && TREE_CODE (decl) == VAR_DECL
790 && !TREE_STATIC (decl)
791 && DECL_INITIAL (decl) != NULL_TREE)
797 /* Update spot bindings P as we pop out of SCOPE. Return true if we
798 should push decls for a label. */
801 update_spot_bindings (struct c_scope *scope, struct c_spot_bindings *p)
803 if (p->scope != scope)
805 /* This label or goto is defined in some other scope, or it is a
806 label which is not yet defined. There is nothing to
811 /* Adjust the spot bindings to refer to the bindings already defined
812 in the enclosing scope. */
813 p->scope = scope->outer;
814 p->bindings_in_scope = p->scope->bindings;
819 /* The Objective-C front-end often needs to determine the current scope. */
822 objc_get_current_scope (void)
824 return current_scope;
827 /* The following function is used only by Objective-C. It needs to live here
828 because it accesses the innards of c_scope. */
831 objc_mark_locals_volatile (void *enclosing_blk)
833 struct c_scope *scope;
836 for (scope = current_scope;
837 scope && scope != enclosing_blk;
838 scope = scope->outer)
840 for (b = scope->bindings; b; b = b->prev)
841 objc_volatilize_decl (b->decl);
843 /* Do not climb up past the current function. */
844 if (scope->function_body)
849 /* Nonzero if we are currently in file scope. */
852 global_bindings_p (void)
854 return (current_scope == file_scope && !c_override_global_bindings_to_false
860 keep_next_level (void)
862 keep_next_level_flag = true;
865 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
868 set_float_const_decimal64 (void)
870 current_scope->float_const_decimal64 = true;
873 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
876 clear_float_const_decimal64 (void)
878 current_scope->float_const_decimal64 = false;
881 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
884 float_const_decimal64_p (void)
886 return current_scope->float_const_decimal64;
889 /* Identify this scope as currently being filled with parameters. */
892 declare_parm_level (void)
894 current_scope->parm_flag = true;
900 if (next_is_function_body)
902 /* This is the transition from the parameters to the top level
903 of the function body. These are the same scope
904 (C99 6.2.1p4,6) so we do not push another scope structure.
905 next_is_function_body is set only by store_parm_decls, which
906 in turn is called when and only when we are about to
907 encounter the opening curly brace for the function body.
909 The outermost block of a function always gets a BLOCK node,
910 because the debugging output routines expect that each
911 function has at least one BLOCK. */
912 current_scope->parm_flag = false;
913 current_scope->function_body = true;
914 current_scope->keep = true;
915 current_scope->outer_function = current_function_scope;
916 current_function_scope = current_scope;
918 keep_next_level_flag = false;
919 next_is_function_body = false;
921 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
922 if (current_scope->outer)
923 current_scope->float_const_decimal64
924 = current_scope->outer->float_const_decimal64;
926 current_scope->float_const_decimal64 = false;
930 struct c_scope *scope;
933 scope = scope_freelist;
934 scope_freelist = scope->outer;
937 scope = GGC_CNEW (struct c_scope);
939 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
941 scope->float_const_decimal64 = current_scope->float_const_decimal64;
943 scope->float_const_decimal64 = false;
945 scope->keep = keep_next_level_flag;
946 scope->outer = current_scope;
947 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
949 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
951 if (current_scope && scope->depth == 0)
954 sorry ("GCC supports only %u nested scopes", scope->depth);
957 current_scope = scope;
958 keep_next_level_flag = false;
962 /* This is called when we are leaving SCOPE. For each label defined
963 in SCOPE, add any appropriate decls to its decls_in_scope fields.
964 These are the decls whose initialization will be skipped by a goto
965 later in the function. */
968 update_label_decls (struct c_scope *scope)
975 if (s->has_label_bindings)
979 for (b = s->bindings; b != NULL; b = b->prev)
981 struct c_label_vars *label_vars;
982 struct c_binding *b1;
984 struct c_goto_bindings *g;
986 if (TREE_CODE (b->decl) != LABEL_DECL)
988 label_vars = b->u.label;
990 b1 = label_vars->label_bindings.bindings_in_scope;
991 if (update_spot_bindings (scope, &label_vars->label_bindings))
993 /* This label is defined in this scope. */
994 for (; b1 != NULL; b1 = b1->prev)
996 /* A goto from later in the function to this
997 label will never see the initialization of
998 B1, if any. Save it to issue a warning if
1000 if (decl_jump_unsafe (b1->decl))
1001 VEC_safe_push (tree, gc, label_vars->decls_in_scope,
1006 /* Update the bindings of any goto statements associated
1009 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1011 update_spot_bindings (scope, &g->goto_bindings);
1015 /* Don't search beyond the current function. */
1016 if (s == current_function_scope)
1023 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1026 set_type_context (tree type, tree context)
1028 for (type = TYPE_MAIN_VARIANT (type); type;
1029 type = TYPE_NEXT_VARIANT (type))
1030 TYPE_CONTEXT (type) = context;
1033 /* Exit a scope. Restore the state of the identifier-decl mappings
1034 that were in effect when this scope was entered. Return a BLOCK
1035 node containing all the DECLs in this scope that are of interest
1036 to debug info generation. */
1041 struct c_scope *scope = current_scope;
1042 tree block, context, p;
1043 struct c_binding *b;
1045 bool functionbody = scope->function_body;
1046 bool keep = functionbody || scope->keep || scope->bindings;
1048 update_label_decls (scope);
1050 /* If appropriate, create a BLOCK to record the decls for the life
1051 of this function. */
1055 block = make_node (BLOCK);
1056 BLOCK_SUBBLOCKS (block) = scope->blocks;
1057 TREE_USED (block) = 1;
1059 /* In each subblock, record that this is its superior. */
1060 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
1061 BLOCK_SUPERCONTEXT (p) = block;
1063 BLOCK_VARS (block) = 0;
1066 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1067 scope must be set so that they point to the appropriate
1068 construct, i.e. either to the current FUNCTION_DECL node, or
1069 else to the BLOCK node we just constructed.
1071 Note that for tagged types whose scope is just the formal
1072 parameter list for some function type specification, we can't
1073 properly set their TYPE_CONTEXTs here, because we don't have a
1074 pointer to the appropriate FUNCTION_TYPE node readily available
1075 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1076 type nodes get set in `grokdeclarator' as soon as we have created
1077 the FUNCTION_TYPE node which will represent the "scope" for these
1078 "parameter list local" tagged types. */
1079 if (scope->function_body)
1080 context = current_function_decl;
1081 else if (scope == file_scope)
1083 tree file_decl = build_decl (UNKNOWN_LOCATION,
1084 TRANSLATION_UNIT_DECL, 0, 0);
1085 TREE_CHAIN (file_decl) = all_translation_units;
1086 all_translation_units = file_decl;
1087 context = file_decl;
1092 /* Clear all bindings in this scope. */
1093 for (b = scope->bindings; b; b = free_binding_and_advance (b))
1096 switch (TREE_CODE (p))
1099 /* Warnings for unused labels, errors for undefined labels. */
1100 if (TREE_USED (p) && !DECL_INITIAL (p))
1102 error ("label %q+D used but not defined", p);
1103 DECL_INITIAL (p) = error_mark_node;
1106 warn_for_unused_label (p);
1108 /* Labels go in BLOCK_VARS. */
1109 TREE_CHAIN (p) = BLOCK_VARS (block);
1110 BLOCK_VARS (block) = p;
1111 gcc_assert (I_LABEL_BINDING (b->id) == b);
1112 I_LABEL_BINDING (b->id) = b->shadowed;
1114 /* Also pop back to the shadowed label_vars. */
1115 release_tree_vector (b->u.label->decls_in_scope);
1116 b->u.label = b->u.label->shadowed;
1122 set_type_context (p, context);
1124 /* Types may not have tag-names, in which case the type
1125 appears in the bindings list with b->id NULL. */
1128 gcc_assert (I_TAG_BINDING (b->id) == b);
1129 I_TAG_BINDING (b->id) = b->shadowed;
1134 /* Propagate TREE_ADDRESSABLE from nested functions to their
1135 containing functions. */
1136 if (!TREE_ASM_WRITTEN (p)
1137 && DECL_INITIAL (p) != 0
1138 && TREE_ADDRESSABLE (p)
1139 && DECL_ABSTRACT_ORIGIN (p) != 0
1140 && DECL_ABSTRACT_ORIGIN (p) != p)
1141 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
1142 if (!DECL_EXTERNAL (p)
1143 && !DECL_INITIAL (p)
1144 && scope != file_scope
1145 && scope != external_scope)
1147 error ("nested function %q+D declared but never defined", p);
1148 undef_nested_function = true;
1150 else if (DECL_DECLARED_INLINE_P (p)
1152 && !DECL_INITIAL (p))
1154 /* C99 6.7.4p6: "a function with external linkage... declared
1155 with an inline function specifier ... shall also be defined
1156 in the same translation unit." */
1157 if (!flag_gnu89_inline)
1158 pedwarn (input_location, 0,
1159 "inline function %q+D declared but never defined", p);
1160 DECL_EXTERNAL (p) = 1;
1166 /* Warnings for unused variables. */
1168 && !TREE_NO_WARNING (p)
1169 && !DECL_IN_SYSTEM_HEADER (p)
1171 && !DECL_ARTIFICIAL (p)
1172 && scope != file_scope
1173 && scope != external_scope)
1174 warning (OPT_Wunused_variable, "unused variable %q+D", p);
1178 error ("type of array %q+D completed incompatibly with"
1179 " implicit initialization", p);
1186 /* All of these go in BLOCK_VARS, but only if this is the
1187 binding in the home scope. */
1190 TREE_CHAIN (p) = BLOCK_VARS (block);
1191 BLOCK_VARS (block) = p;
1193 else if (VAR_OR_FUNCTION_DECL_P (p))
1195 /* For block local externs add a special
1196 DECL_EXTERNAL decl for debug info generation. */
1197 tree extp = copy_node (p);
1199 DECL_EXTERNAL (extp) = 1;
1200 TREE_STATIC (extp) = 0;
1201 TREE_PUBLIC (extp) = 1;
1202 DECL_INITIAL (extp) = NULL_TREE;
1203 DECL_LANG_SPECIFIC (extp) = NULL;
1204 DECL_CONTEXT (extp) = current_function_decl;
1205 if (TREE_CODE (p) == FUNCTION_DECL)
1207 DECL_RESULT (extp) = NULL_TREE;
1208 DECL_SAVED_TREE (extp) = NULL_TREE;
1209 DECL_STRUCT_FUNCTION (extp) = NULL;
1211 if (b->locus != UNKNOWN_LOCATION)
1212 DECL_SOURCE_LOCATION (extp) = b->locus;
1213 TREE_CHAIN (extp) = BLOCK_VARS (block);
1214 BLOCK_VARS (block) = extp;
1216 /* If this is the file scope, and we are processing more
1217 than one translation unit in this compilation, set
1218 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
1219 This makes same_translation_unit_p work, and causes
1220 static declarations to be given disambiguating suffixes. */
1221 if (scope == file_scope && num_in_fnames > 1)
1223 DECL_CONTEXT (p) = context;
1224 if (TREE_CODE (p) == TYPE_DECL)
1225 set_type_context (TREE_TYPE (p), context);
1229 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1230 already been put there by store_parm_decls. Unused-
1231 parameter warnings are handled by function.c.
1232 error_mark_node obviously does not go in BLOCK_VARS and
1233 does not get unused-variable warnings. */
1236 /* It is possible for a decl not to have a name. We get
1237 here with b->id NULL in this case. */
1240 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
1241 I_SYMBOL_BINDING (b->id) = b->shadowed;
1242 if (b->shadowed && b->shadowed->u.type)
1243 TREE_TYPE (b->shadowed->decl) = b->shadowed->u.type;
1253 /* Dispose of the block that we just made inside some higher level. */
1254 if ((scope->function_body || scope == file_scope) && context)
1256 DECL_INITIAL (context) = block;
1257 BLOCK_SUPERCONTEXT (block) = context;
1259 else if (scope->outer)
1262 SCOPE_LIST_APPEND (scope->outer, blocks, block);
1263 /* If we did not make a block for the scope just exited, any
1264 blocks made for inner scopes must be carried forward so they
1265 will later become subblocks of something else. */
1266 else if (scope->blocks)
1267 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
1270 /* Pop the current scope, and free the structure for reuse. */
1271 current_scope = scope->outer;
1272 if (scope->function_body)
1273 current_function_scope = scope->outer_function;
1275 memset (scope, 0, sizeof (struct c_scope));
1276 scope->outer = scope_freelist;
1277 scope_freelist = scope;
1283 push_file_scope (void)
1291 file_scope = current_scope;
1293 start_fname_decls ();
1295 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
1296 bind (DECL_NAME (decl), decl, file_scope,
1297 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl));
1301 pop_file_scope (void)
1303 /* In case there were missing closebraces, get us back to the global
1305 while (current_scope != file_scope)
1308 /* __FUNCTION__ is defined at file scope (""). This
1309 call may not be necessary as my tests indicate it
1310 still works without it. */
1311 finish_fname_decls ();
1313 check_inline_statics ();
1315 /* This is the point to write out a PCH if we're doing that.
1316 In that case we do not want to do anything else. */
1319 c_common_write_pch ();
1323 /* Pop off the file scope and close this translation unit. */
1327 maybe_apply_pending_pragma_weaks ();
1330 /* Adjust the bindings for the start of a statement expression. */
1333 c_bindings_start_stmt_expr (struct c_spot_bindings* switch_bindings)
1335 struct c_scope *scope;
1337 for (scope = current_scope; scope != NULL; scope = scope->outer)
1339 struct c_binding *b;
1341 if (!scope->has_label_bindings)
1344 for (b = scope->bindings; b != NULL; b = b->prev)
1346 struct c_label_vars *label_vars;
1348 struct c_goto_bindings *g;
1350 if (TREE_CODE (b->decl) != LABEL_DECL)
1352 label_vars = b->u.label;
1353 ++label_vars->label_bindings.stmt_exprs;
1355 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
1357 ++g->goto_bindings.stmt_exprs;
1361 if (switch_bindings != NULL)
1362 ++switch_bindings->stmt_exprs;
1365 /* Adjust the bindings for the end of a statement expression. */
1368 c_bindings_end_stmt_expr (struct c_spot_bindings *switch_bindings)
1370 struct c_scope *scope;
1372 for (scope = current_scope; scope != NULL; scope = scope->outer)
1374 struct c_binding *b;
1376 if (!scope->has_label_bindings)
1379 for (b = scope->bindings; b != NULL; b = b->prev)
1381 struct c_label_vars *label_vars;
1383 struct c_goto_bindings *g;
1385 if (TREE_CODE (b->decl) != LABEL_DECL)
1387 label_vars = b->u.label;
1388 --label_vars->label_bindings.stmt_exprs;
1389 if (label_vars->label_bindings.stmt_exprs < 0)
1391 label_vars->label_bindings.left_stmt_expr = true;
1392 label_vars->label_bindings.stmt_exprs = 0;
1395 VEC_iterate (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 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1520 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1523 t = TYPE_ARG_TYPES (oldtype);
1525 t = TYPE_ARG_TYPES (newtype);
1526 for (; t; t = TREE_CHAIN (t))
1528 tree type = TREE_VALUE (t);
1530 if (TREE_CHAIN (t) == 0
1531 && TYPE_MAIN_VARIANT (type) != void_type_node)
1533 inform (input_location, "a parameter list with an ellipsis can%'t match "
1534 "an empty parameter name list declaration");
1538 if (c_type_promotes_to (type) != type)
1540 inform (input_location, "an argument type that has a default promotion can%'t match "
1541 "an empty parameter name list declaration");
1547 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1548 old-style function definition, NEWDECL is a prototype declaration.
1549 Diagnose inconsistencies in the argument list. Returns TRUE if
1550 the prototype is compatible, FALSE if not. */
1552 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1554 tree newargs, oldargs;
1557 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1559 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1560 newargs = TYPE_ARG_TYPES (newtype);
1565 tree oldargtype = TREE_VALUE (oldargs);
1566 tree newargtype = TREE_VALUE (newargs);
1568 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1571 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1572 newargtype = TYPE_MAIN_VARIANT (newargtype);
1574 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1577 /* Reaching the end of just one list means the two decls don't
1578 agree on the number of arguments. */
1579 if (END_OF_ARGLIST (oldargtype))
1581 error ("prototype for %q+D declares more arguments "
1582 "than previous old-style definition", newdecl);
1585 else if (END_OF_ARGLIST (newargtype))
1587 error ("prototype for %q+D declares fewer arguments "
1588 "than previous old-style definition", newdecl);
1592 /* Type for passing arg must be consistent with that declared
1594 else if (!comptypes (oldargtype, newargtype))
1596 error ("prototype for %q+D declares argument %d"
1597 " with incompatible type",
1602 oldargs = TREE_CHAIN (oldargs);
1603 newargs = TREE_CHAIN (newargs);
1607 /* If we get here, no errors were found, but do issue a warning
1608 for this poor-style construct. */
1609 warning (0, "prototype for %q+D follows non-prototype definition",
1612 #undef END_OF_ARGLIST
1615 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1616 first in a pair of mismatched declarations, using the diagnostic
1619 locate_old_decl (tree decl)
1621 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1623 else if (DECL_INITIAL (decl))
1624 inform (input_location, "previous definition of %q+D was here", decl);
1625 else if (C_DECL_IMPLICIT (decl))
1626 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1628 inform (input_location, "previous declaration of %q+D was here", decl);
1631 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1632 Returns true if the caller should proceed to merge the two, false
1633 if OLDDECL should simply be discarded. As a side effect, issues
1634 all necessary diagnostics for invalid or poor-style combinations.
1635 If it returns true, writes the types of NEWDECL and OLDDECL to
1636 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1637 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1640 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1641 tree *newtypep, tree *oldtypep)
1643 tree newtype, oldtype;
1644 bool pedwarned = false;
1645 bool warned = false;
1648 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1649 && DECL_EXTERNAL (DECL))
1651 /* If we have error_mark_node for either decl or type, just discard
1652 the previous decl - we're in an error cascade already. */
1653 if (olddecl == error_mark_node || newdecl == error_mark_node)
1655 *oldtypep = oldtype = TREE_TYPE (olddecl);
1656 *newtypep = newtype = TREE_TYPE (newdecl);
1657 if (oldtype == error_mark_node || newtype == error_mark_node)
1660 /* Two different categories of symbol altogether. This is an error
1661 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1662 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1664 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1665 && DECL_BUILT_IN (olddecl)
1666 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1668 error ("%q+D redeclared as different kind of symbol", newdecl);
1669 locate_old_decl (olddecl);
1671 else if (TREE_PUBLIC (newdecl))
1672 warning (0, "built-in function %q+D declared as non-function",
1675 warning (OPT_Wshadow, "declaration of %q+D shadows "
1676 "a built-in function", newdecl);
1680 /* Enumerators have no linkage, so may only be declared once in a
1682 if (TREE_CODE (olddecl) == CONST_DECL)
1684 error ("redeclaration of enumerator %q+D", newdecl);
1685 locate_old_decl (olddecl);
1689 if (!comptypes (oldtype, newtype))
1691 if (TREE_CODE (olddecl) == FUNCTION_DECL
1692 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1694 /* Accept harmless mismatch in function types.
1695 This is for the ffs and fprintf builtins. */
1696 tree trytype = match_builtin_function_types (newtype, oldtype);
1698 if (trytype && comptypes (newtype, trytype))
1699 *oldtypep = oldtype = trytype;
1702 /* If types don't match for a built-in, throw away the
1703 built-in. No point in calling locate_old_decl here, it
1704 won't print anything. */
1705 warning (0, "conflicting types for built-in function %q+D",
1710 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1711 && DECL_IS_BUILTIN (olddecl))
1713 /* A conflicting function declaration for a predeclared
1714 function that isn't actually built in. Objective C uses
1715 these. The new declaration silently overrides everything
1716 but the volatility (i.e. noreturn) indication. See also
1717 below. FIXME: Make Objective C use normal builtins. */
1718 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1721 /* Permit void foo (...) to match int foo (...) if the latter is
1722 the definition and implicit int was used. See
1723 c-torture/compile/920625-2.c. */
1724 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1725 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1726 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1727 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1729 pedwarned = pedwarn (input_location, 0,
1730 "conflicting types for %q+D", newdecl);
1731 /* Make sure we keep void as the return type. */
1732 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1733 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1735 /* Permit void foo (...) to match an earlier call to foo (...) with
1736 no declared type (thus, implicitly int). */
1737 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1738 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1739 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1740 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1742 pedwarned = pedwarn (input_location, 0,
1743 "conflicting types for %q+D", newdecl);
1744 /* Make sure we keep void as the return type. */
1745 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1749 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1750 error ("conflicting type qualifiers for %q+D", newdecl);
1752 error ("conflicting types for %q+D", newdecl);
1753 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1754 locate_old_decl (olddecl);
1759 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1760 but silently ignore the redeclaration if either is in a system
1761 header. (Conflicting redeclarations were handled above.) */
1762 if (TREE_CODE (newdecl) == TYPE_DECL)
1764 if (DECL_IN_SYSTEM_HEADER (newdecl)
1765 || DECL_IN_SYSTEM_HEADER (olddecl)
1766 || TREE_NO_WARNING (newdecl)
1767 || TREE_NO_WARNING (olddecl))
1768 return true; /* Allow OLDDECL to continue in use. */
1770 error ("redefinition of typedef %q+D", newdecl);
1771 locate_old_decl (olddecl);
1775 /* Function declarations can either be 'static' or 'extern' (no
1776 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1777 can never conflict with each other on account of linkage
1778 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1779 gnu89 mode permits two definitions if one is 'extern inline' and
1780 one is not. The non- extern-inline definition supersedes the
1781 extern-inline definition. */
1783 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1785 /* If you declare a built-in function name as static, or
1786 define the built-in with an old-style definition (so we
1787 can't validate the argument list) the built-in definition is
1788 overridden, but optionally warn this was a bad choice of name. */
1789 if (DECL_BUILT_IN (olddecl)
1790 && !C_DECL_DECLARED_BUILTIN (olddecl)
1791 && (!TREE_PUBLIC (newdecl)
1792 || (DECL_INITIAL (newdecl)
1793 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1795 warning (OPT_Wshadow, "declaration of %q+D shadows "
1796 "a built-in function", newdecl);
1797 /* Discard the old built-in function. */
1801 if (DECL_INITIAL (newdecl))
1803 if (DECL_INITIAL (olddecl))
1805 /* If both decls are in the same TU and the new declaration
1806 isn't overriding an extern inline reject the new decl.
1807 In c99, no overriding is allowed in the same translation
1809 if ((!DECL_EXTERN_INLINE (olddecl)
1810 || DECL_EXTERN_INLINE (newdecl)
1811 || (!flag_gnu89_inline
1812 && (!DECL_DECLARED_INLINE_P (olddecl)
1813 || !lookup_attribute ("gnu_inline",
1814 DECL_ATTRIBUTES (olddecl)))
1815 && (!DECL_DECLARED_INLINE_P (newdecl)
1816 || !lookup_attribute ("gnu_inline",
1817 DECL_ATTRIBUTES (newdecl))))
1819 && same_translation_unit_p (newdecl, olddecl))
1821 error ("redefinition of %q+D", newdecl);
1822 locate_old_decl (olddecl);
1827 /* If we have a prototype after an old-style function definition,
1828 the argument types must be checked specially. */
1829 else if (DECL_INITIAL (olddecl)
1830 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1831 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1832 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1834 locate_old_decl (olddecl);
1837 /* A non-static declaration (even an "extern") followed by a
1838 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1839 The same is true for a static forward declaration at block
1840 scope followed by a non-static declaration/definition at file
1841 scope. Static followed by non-static at the same scope is
1842 not undefined behavior, and is the most convenient way to get
1843 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1844 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1845 we do diagnose it if -Wtraditional. */
1846 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1848 /* Two exceptions to the rule. If olddecl is an extern
1849 inline, or a predeclared function that isn't actually
1850 built in, newdecl silently overrides olddecl. The latter
1851 occur only in Objective C; see also above. (FIXME: Make
1852 Objective C use normal builtins.) */
1853 if (!DECL_IS_BUILTIN (olddecl)
1854 && !DECL_EXTERN_INLINE (olddecl))
1856 error ("static declaration of %q+D follows "
1857 "non-static declaration", newdecl);
1858 locate_old_decl (olddecl);
1862 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1864 if (DECL_CONTEXT (olddecl))
1866 error ("non-static declaration of %q+D follows "
1867 "static declaration", newdecl);
1868 locate_old_decl (olddecl);
1871 else if (warn_traditional)
1873 warned |= warning (OPT_Wtraditional,
1874 "non-static declaration of %q+D "
1875 "follows static declaration", newdecl);
1879 /* Make sure gnu_inline attribute is either not present, or
1880 present on all inline decls. */
1881 if (DECL_DECLARED_INLINE_P (olddecl)
1882 && DECL_DECLARED_INLINE_P (newdecl))
1884 bool newa = lookup_attribute ("gnu_inline",
1885 DECL_ATTRIBUTES (newdecl)) != NULL;
1886 bool olda = lookup_attribute ("gnu_inline",
1887 DECL_ATTRIBUTES (olddecl)) != NULL;
1890 error_at (input_location, "%<gnu_inline%> attribute present on %q+D",
1891 newa ? newdecl : olddecl);
1892 error_at (DECL_SOURCE_LOCATION (newa ? olddecl : newdecl),
1897 else if (TREE_CODE (newdecl) == VAR_DECL)
1899 /* Only variables can be thread-local, and all declarations must
1900 agree on this property. */
1901 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1903 /* Nothing to check. Since OLDDECL is marked threadprivate
1904 and NEWDECL does not have a thread-local attribute, we
1905 will merge the threadprivate attribute into NEWDECL. */
1908 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1910 if (DECL_THREAD_LOCAL_P (newdecl))
1911 error ("thread-local declaration of %q+D follows "
1912 "non-thread-local declaration", newdecl);
1914 error ("non-thread-local declaration of %q+D follows "
1915 "thread-local declaration", newdecl);
1917 locate_old_decl (olddecl);
1921 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1922 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1924 error ("redefinition of %q+D", newdecl);
1925 locate_old_decl (olddecl);
1929 /* Objects declared at file scope: if the first declaration had
1930 external linkage (even if it was an external reference) the
1931 second must have external linkage as well, or the behavior is
1932 undefined. If the first declaration had internal linkage, then
1933 the second must too, or else be an external reference (in which
1934 case the composite declaration still has internal linkage).
1935 As for function declarations, we warn about the static-then-
1936 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1937 if (DECL_FILE_SCOPE_P (newdecl)
1938 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1940 if (DECL_EXTERNAL (newdecl))
1942 if (!DECL_FILE_SCOPE_P (olddecl))
1944 error ("extern declaration of %q+D follows "
1945 "declaration with no linkage", newdecl);
1946 locate_old_decl (olddecl);
1949 else if (warn_traditional)
1951 warned |= warning (OPT_Wtraditional,
1952 "non-static declaration of %q+D "
1953 "follows static declaration", newdecl);
1958 if (TREE_PUBLIC (newdecl))
1959 error ("non-static declaration of %q+D follows "
1960 "static declaration", newdecl);
1962 error ("static declaration of %q+D follows "
1963 "non-static declaration", newdecl);
1965 locate_old_decl (olddecl);
1969 /* Two objects with the same name declared at the same block
1970 scope must both be external references (6.7p3). */
1971 else if (!DECL_FILE_SCOPE_P (newdecl))
1973 if (DECL_EXTERNAL (newdecl))
1975 /* Extern with initializer at block scope, which will
1976 already have received an error. */
1978 else if (DECL_EXTERNAL (olddecl))
1980 error ("declaration of %q+D with no linkage follows "
1981 "extern declaration", newdecl);
1982 locate_old_decl (olddecl);
1986 error ("redeclaration of %q+D with no linkage", newdecl);
1987 locate_old_decl (olddecl);
1993 /* C++ does not permit a decl to appear multiple times at file
1996 && DECL_FILE_SCOPE_P (newdecl)
1997 && !DECL_EXTERNAL (newdecl)
1998 && !DECL_EXTERNAL (olddecl))
1999 warned |= warning_at (DECL_SOURCE_LOCATION (newdecl),
2001 ("duplicate declaration of %qD is "
2007 /* All decls must agree on a visibility. */
2008 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
2009 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
2010 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2012 warned |= warning (0, "redeclaration of %q+D with different visibility "
2013 "(old visibility preserved)", newdecl);
2016 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2018 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2019 if (DECL_DECLARED_INLINE_P (newdecl)
2020 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
2022 warned |= warning (OPT_Wattributes,
2023 "inline declaration of %qD follows "
2024 "declaration with attribute noinline", newdecl);
2026 else if (DECL_DECLARED_INLINE_P (olddecl)
2027 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
2029 warned |= warning (OPT_Wattributes,
2030 "declaration of %q+D with attribute "
2031 "noinline follows inline declaration ", newdecl);
2034 else /* PARM_DECL, VAR_DECL */
2036 /* Redeclaration of a parameter is a constraint violation (this is
2037 not explicitly stated, but follows from C99 6.7p3 [no more than
2038 one declaration of the same identifier with no linkage in the
2039 same scope, except type tags] and 6.2.2p6 [parameters have no
2040 linkage]). We must check for a forward parameter declaration,
2041 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2042 an extension, the mandatory diagnostic for which is handled by
2043 mark_forward_parm_decls. */
2045 if (TREE_CODE (newdecl) == PARM_DECL
2046 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
2048 error ("redefinition of parameter %q+D", newdecl);
2049 locate_old_decl (olddecl);
2054 /* Optional warning for completely redundant decls. */
2055 if (!warned && !pedwarned
2056 && warn_redundant_decls
2057 /* Don't warn about a function declaration followed by a
2059 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2060 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
2061 /* Don't warn about redundant redeclarations of builtins. */
2062 && !(TREE_CODE (newdecl) == FUNCTION_DECL
2063 && !DECL_BUILT_IN (newdecl)
2064 && DECL_BUILT_IN (olddecl)
2065 && !C_DECL_DECLARED_BUILTIN (olddecl))
2066 /* Don't warn about an extern followed by a definition. */
2067 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
2068 /* Don't warn about forward parameter decls. */
2069 && !(TREE_CODE (newdecl) == PARM_DECL
2070 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2071 /* Don't warn about a variable definition following a declaration. */
2072 && !(TREE_CODE (newdecl) == VAR_DECL
2073 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
2075 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
2079 /* Report location of previous decl/defn. */
2080 if (warned || pedwarned)
2081 locate_old_decl (olddecl);
2083 #undef DECL_EXTERN_INLINE
2088 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2089 consistent with OLDDECL, but carries new information. Merge the
2090 new information into OLDDECL. This function issues no
2094 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
2096 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
2097 && DECL_INITIAL (newdecl) != 0);
2098 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
2099 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
2100 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
2101 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
2102 bool extern_changed = false;
2104 /* For real parm decl following a forward decl, rechain the old decl
2105 in its new location and clear TREE_ASM_WRITTEN (it's not a
2106 forward decl anymore). */
2107 if (TREE_CODE (newdecl) == PARM_DECL
2108 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2110 struct c_binding *b, **here;
2112 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
2113 if ((*here)->decl == olddecl)
2120 b->prev = current_scope->bindings;
2121 current_scope->bindings = b;
2123 TREE_ASM_WRITTEN (olddecl) = 0;
2126 DECL_ATTRIBUTES (newdecl)
2127 = targetm.merge_decl_attributes (olddecl, newdecl);
2129 /* Merge the data types specified in the two decls. */
2131 = TREE_TYPE (olddecl)
2132 = composite_type (newtype, oldtype);
2134 /* Lay the type out, unless already done. */
2135 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
2137 if (TREE_TYPE (newdecl) != error_mark_node)
2138 layout_type (TREE_TYPE (newdecl));
2139 if (TREE_CODE (newdecl) != FUNCTION_DECL
2140 && TREE_CODE (newdecl) != TYPE_DECL
2141 && TREE_CODE (newdecl) != CONST_DECL)
2142 layout_decl (newdecl, 0);
2146 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2147 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
2148 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
2149 DECL_MODE (newdecl) = DECL_MODE (olddecl);
2150 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2152 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2153 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2157 /* Keep the old rtl since we can safely use it. */
2158 if (HAS_RTL_P (olddecl))
2159 COPY_DECL_RTL (olddecl, newdecl);
2161 /* Merge the type qualifiers. */
2162 if (TREE_READONLY (newdecl))
2163 TREE_READONLY (olddecl) = 1;
2165 if (TREE_THIS_VOLATILE (newdecl))
2166 TREE_THIS_VOLATILE (olddecl) = 1;
2168 /* Merge deprecatedness. */
2169 if (TREE_DEPRECATED (newdecl))
2170 TREE_DEPRECATED (olddecl) = 1;
2172 /* If a decl is in a system header and the other isn't, keep the one on the
2173 system header. Otherwise, keep source location of definition rather than
2174 declaration and of prototype rather than non-prototype unless that
2175 prototype is built-in. */
2176 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2177 && DECL_IN_SYSTEM_HEADER (olddecl)
2178 && !DECL_IN_SYSTEM_HEADER (newdecl) )
2179 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2180 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
2181 && DECL_IN_SYSTEM_HEADER (newdecl)
2182 && !DECL_IN_SYSTEM_HEADER (olddecl))
2183 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
2184 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
2185 || (old_is_prototype && !new_is_prototype
2186 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
2187 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2189 /* Merge the initialization information. */
2190 if (DECL_INITIAL (newdecl) == 0)
2191 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2193 /* Merge the threadprivate attribute. */
2194 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
2196 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
2197 C_DECL_THREADPRIVATE_P (newdecl) = 1;
2200 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
2202 /* Merge the section attribute.
2203 We want to issue an error if the sections conflict but that
2204 must be done later in decl_attributes since we are called
2205 before attributes are assigned. */
2206 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2207 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2209 /* Copy the assembler name.
2210 Currently, it can only be defined in the prototype. */
2211 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2213 /* Use visibility of whichever declaration had it specified */
2214 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2216 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2217 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2220 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2222 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2223 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2224 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2225 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2226 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2227 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2228 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2229 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2230 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2231 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2232 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
2235 /* Merge the storage class information. */
2236 merge_weak (newdecl, olddecl);
2238 /* For functions, static overrides non-static. */
2239 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2241 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2242 /* This is since we don't automatically
2243 copy the attributes of NEWDECL into OLDDECL. */
2244 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2245 /* If this clears `static', clear it in the identifier too. */
2246 if (!TREE_PUBLIC (olddecl))
2247 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2251 /* In c99, 'extern' declaration before (or after) 'inline' means this
2252 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2254 if (TREE_CODE (newdecl) == FUNCTION_DECL
2255 && !flag_gnu89_inline
2256 && (DECL_DECLARED_INLINE_P (newdecl)
2257 || DECL_DECLARED_INLINE_P (olddecl))
2258 && (!DECL_DECLARED_INLINE_P (newdecl)
2259 || !DECL_DECLARED_INLINE_P (olddecl)
2260 || !DECL_EXTERNAL (olddecl))
2261 && DECL_EXTERNAL (newdecl)
2262 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
2263 && !current_function_decl)
2264 DECL_EXTERNAL (newdecl) = 0;
2266 if (DECL_EXTERNAL (newdecl))
2268 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2269 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2271 /* An extern decl does not override previous storage class. */
2272 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2273 if (!DECL_EXTERNAL (newdecl))
2275 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2276 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2281 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2282 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2285 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2287 /* If we're redefining a function previously defined as extern
2288 inline, make sure we emit debug info for the inline before we
2289 throw it away, in case it was inlined into a function that
2290 hasn't been written out yet. */
2291 if (new_is_definition && DECL_INITIAL (olddecl))
2292 /* The new defn must not be inline. */
2293 DECL_UNINLINABLE (newdecl) = 1;
2296 /* If either decl says `inline', this fn is inline, unless
2297 its definition was passed already. */
2298 if (DECL_DECLARED_INLINE_P (newdecl)
2299 || DECL_DECLARED_INLINE_P (olddecl))
2300 DECL_DECLARED_INLINE_P (newdecl) = 1;
2302 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2303 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2305 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2306 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2307 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2308 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2311 if (DECL_BUILT_IN (olddecl))
2313 /* If redeclaring a builtin function, it stays built in.
2314 But it gets tagged as having been declared. */
2315 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2316 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2317 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
2318 if (new_is_prototype)
2319 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
2321 C_DECL_BUILTIN_PROTOTYPE (newdecl)
2322 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
2325 /* Preserve function specific target and optimization options */
2326 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2327 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2328 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2329 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2331 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2332 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2333 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2334 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2336 /* Also preserve various other info from the definition. */
2337 if (!new_is_definition)
2340 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2341 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2342 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2343 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2344 gimple_set_body (newdecl, gimple_body (olddecl));
2345 DECL_ARGUMENTS (newdecl) = copy_list (DECL_ARGUMENTS (olddecl));
2346 for (t = DECL_ARGUMENTS (newdecl); t ; t = TREE_CHAIN (t))
2347 DECL_CONTEXT (t) = newdecl;
2349 /* See if we've got a function to instantiate from. */
2350 if (DECL_SAVED_TREE (olddecl))
2351 DECL_ABSTRACT_ORIGIN (newdecl)
2352 = DECL_ABSTRACT_ORIGIN (olddecl);
2356 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
2358 /* Merge the USED information. */
2359 if (TREE_USED (olddecl))
2360 TREE_USED (newdecl) = 1;
2361 else if (TREE_USED (newdecl))
2362 TREE_USED (olddecl) = 1;
2364 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2365 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2366 DECL_ARGUMENTS (if appropriate). */
2368 unsigned olddecl_uid = DECL_UID (olddecl);
2369 tree olddecl_context = DECL_CONTEXT (olddecl);
2370 tree olddecl_arguments = NULL;
2371 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2372 olddecl_arguments = DECL_ARGUMENTS (olddecl);
2374 memcpy ((char *) olddecl + sizeof (struct tree_common),
2375 (char *) newdecl + sizeof (struct tree_common),
2376 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2377 switch (TREE_CODE (olddecl))
2380 gimple_set_body (olddecl, gimple_body (newdecl));
2390 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2391 (char *) newdecl + sizeof (struct tree_decl_common),
2392 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
2397 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2398 (char *) newdecl + sizeof (struct tree_decl_common),
2399 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
2401 DECL_UID (olddecl) = olddecl_uid;
2402 DECL_CONTEXT (olddecl) = olddecl_context;
2403 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2404 DECL_ARGUMENTS (olddecl) = olddecl_arguments;
2407 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2408 so that encode_section_info has a chance to look at the new decl
2409 flags and attributes. */
2410 if (DECL_RTL_SET_P (olddecl)
2411 && (TREE_CODE (olddecl) == FUNCTION_DECL
2412 || (TREE_CODE (olddecl) == VAR_DECL
2413 && TREE_STATIC (olddecl))))
2414 make_decl_rtl (olddecl);
2416 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2417 and the definition is coming from the old version, cgraph needs
2418 to be called again. */
2419 if (extern_changed && !new_is_definition
2420 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
2421 cgraph_mark_if_needed (olddecl);
2424 /* Handle when a new declaration NEWDECL has the same name as an old
2425 one OLDDECL in the same binding contour. Prints an error message
2428 If safely possible, alter OLDDECL to look like NEWDECL, and return
2429 true. Otherwise, return false. */
2432 duplicate_decls (tree newdecl, tree olddecl)
2434 tree newtype = NULL, oldtype = NULL;
2436 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
2438 /* Avoid `unused variable' and other warnings for OLDDECL. */
2439 TREE_NO_WARNING (olddecl) = 1;
2443 merge_decls (newdecl, olddecl, newtype, oldtype);
2448 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2450 warn_if_shadowing (tree new_decl)
2452 struct c_binding *b;
2454 /* Shadow warnings wanted? */
2456 /* No shadow warnings for internally generated vars. */
2457 || DECL_IS_BUILTIN (new_decl)
2458 /* No shadow warnings for vars made for inlining. */
2459 || DECL_FROM_INLINE (new_decl))
2462 /* Is anything being shadowed? Invisible decls do not count. */
2463 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
2464 if (b->decl && b->decl != new_decl && !b->invisible)
2466 tree old_decl = b->decl;
2468 if (old_decl == error_mark_node)
2470 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
2471 "non-variable", new_decl);
2474 else if (TREE_CODE (old_decl) == PARM_DECL)
2475 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
2477 else if (DECL_FILE_SCOPE_P (old_decl))
2478 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
2479 "declaration", new_decl);
2480 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2481 && DECL_BUILT_IN (old_decl))
2483 warning (OPT_Wshadow, "declaration of %q+D shadows "
2484 "a built-in function", new_decl);
2488 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2491 warning_at (DECL_SOURCE_LOCATION (old_decl), OPT_Wshadow,
2492 "shadowed declaration is here");
2498 /* Record a decl-node X as belonging to the current lexical scope.
2499 Check for errors (such as an incompatible declaration for the same
2500 name already seen in the same scope).
2502 Returns either X or an old decl for the same name.
2503 If an old decl is returned, it may have been smashed
2504 to agree with what X says. */
2509 tree name = DECL_NAME (x);
2510 struct c_scope *scope = current_scope;
2511 struct c_binding *b;
2512 bool nested = false;
2513 location_t locus = DECL_SOURCE_LOCATION (x);
2515 /* Must set DECL_CONTEXT for everything not at file scope or
2516 DECL_FILE_SCOPE_P won't work. Local externs don't count
2517 unless they have initializers (which generate code). */
2518 if (current_function_decl
2519 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2520 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2521 DECL_CONTEXT (x) = current_function_decl;
2523 /* Anonymous decls are just inserted in the scope. */
2526 bind (name, x, scope, /*invisible=*/false, /*nested=*/false,
2531 /* First, see if there is another declaration with the same name in
2532 the current scope. If there is, duplicate_decls may do all the
2533 work for us. If duplicate_decls returns false, that indicates
2534 two incompatible decls in the same scope; we are to silently
2535 replace the old one (duplicate_decls has issued all appropriate
2536 diagnostics). In particular, we should not consider possible
2537 duplicates in the external scope, or shadowing. */
2538 b = I_SYMBOL_BINDING (name);
2539 if (b && B_IN_SCOPE (b, scope))
2541 struct c_binding *b_ext, *b_use;
2542 tree type = TREE_TYPE (x);
2543 tree visdecl = b->decl;
2544 tree vistype = TREE_TYPE (visdecl);
2545 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2546 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2547 b->inner_comp = false;
2550 /* If this is an external linkage declaration, we should check
2551 for compatibility with the type in the external scope before
2552 setting the type at this scope based on the visible
2553 information only. */
2554 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2556 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2557 b_ext = b_ext->shadowed;
2562 TREE_TYPE (b_use->decl) = b_use->u.type;
2565 if (duplicate_decls (x, b_use->decl))
2569 /* Save the updated type in the external scope and
2570 restore the proper type for this scope. */
2572 if (comptypes (vistype, type))
2573 thistype = composite_type (vistype, type);
2575 thistype = TREE_TYPE (b_use->decl);
2576 b_use->u.type = TREE_TYPE (b_use->decl);
2577 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2578 && DECL_BUILT_IN (b_use->decl))
2580 = build_type_attribute_variant (thistype,
2583 TREE_TYPE (b_use->decl) = thistype;
2588 goto skip_external_and_shadow_checks;
2591 /* All declarations with external linkage, and all external
2592 references, go in the external scope, no matter what scope is
2593 current. However, the binding in that scope is ignored for
2594 purposes of normal name lookup. A separate binding structure is
2595 created in the requested scope; this governs the normal
2596 visibility of the symbol.
2598 The binding in the externals scope is used exclusively for
2599 detecting duplicate declarations of the same object, no matter
2600 what scope they are in; this is what we do here. (C99 6.2.7p2:
2601 All declarations that refer to the same object or function shall
2602 have compatible type; otherwise, the behavior is undefined.) */
2603 if (DECL_EXTERNAL (x) || scope == file_scope)
2605 tree type = TREE_TYPE (x);
2608 bool type_saved = false;
2609 if (b && !B_IN_EXTERNAL_SCOPE (b)
2610 && (TREE_CODE (b->decl) == FUNCTION_DECL
2611 || TREE_CODE (b->decl) == VAR_DECL)
2612 && DECL_FILE_SCOPE_P (b->decl))
2615 vistype = TREE_TYPE (visdecl);
2617 if (scope != file_scope
2618 && !DECL_IN_SYSTEM_HEADER (x))
2619 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2621 while (b && !B_IN_EXTERNAL_SCOPE (b))
2623 /* If this decl might be modified, save its type. This is
2624 done here rather than when the decl is first bound
2625 because the type may change after first binding, through
2626 being completed or through attributes being added. If we
2627 encounter multiple such decls, only the first should have
2628 its type saved; the others will already have had their
2629 proper types saved and the types will not have changed as
2630 their scopes will not have been re-entered. */
2631 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2633 b->u.type = TREE_TYPE (b->decl);
2636 if (B_IN_FILE_SCOPE (b)
2637 && TREE_CODE (b->decl) == VAR_DECL
2638 && TREE_STATIC (b->decl)
2639 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2640 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2641 && TREE_CODE (type) == ARRAY_TYPE
2642 && TYPE_DOMAIN (type)
2643 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2644 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2646 /* Array type completed in inner scope, which should be
2647 diagnosed if the completion does not have size 1 and
2648 it does not get completed in the file scope. */
2649 b->inner_comp = true;
2654 /* If a matching external declaration has been found, set its
2655 type to the composite of all the types of that declaration.
2656 After the consistency checks, it will be reset to the
2657 composite of the visible types only. */
2658 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2660 TREE_TYPE (b->decl) = b->u.type;
2662 /* The point of the same_translation_unit_p check here is,
2663 we want to detect a duplicate decl for a construct like
2664 foo() { extern bar(); } ... static bar(); but not if
2665 they are in different translation units. In any case,
2666 the static does not go in the externals scope. */
2668 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2669 && duplicate_decls (x, b->decl))
2674 if (comptypes (vistype, type))
2675 thistype = composite_type (vistype, type);
2677 thistype = TREE_TYPE (b->decl);
2681 b->u.type = TREE_TYPE (b->decl);
2682 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2684 = build_type_attribute_variant (thistype,
2685 TYPE_ATTRIBUTES (b->u.type));
2686 TREE_TYPE (b->decl) = thistype;
2687 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true,
2691 else if (TREE_PUBLIC (x))
2693 if (visdecl && !b && duplicate_decls (x, visdecl))
2695 /* An external declaration at block scope referring to a
2696 visible entity with internal linkage. The composite
2697 type will already be correct for this scope, so we
2698 just need to fall through to make the declaration in
2705 bind (name, x, external_scope, /*invisible=*/true,
2706 /*nested=*/false, locus);
2712 if (TREE_CODE (x) != PARM_DECL)
2713 warn_if_shadowing (x);
2715 skip_external_and_shadow_checks:
2716 if (TREE_CODE (x) == TYPE_DECL)
2717 set_underlying_type (x);
2719 bind (name, x, scope, /*invisible=*/false, nested, locus);
2721 /* If x's type is incomplete because it's based on a
2722 structure or union which has not yet been fully declared,
2723 attach it to that structure or union type, so we can go
2724 back and complete the variable declaration later, if the
2725 structure or union gets fully declared.
2727 If the input is erroneous, we can have error_mark in the type
2728 slot (e.g. "f(void a, ...)") - that doesn't count as an
2730 if (TREE_TYPE (x) != error_mark_node
2731 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2733 tree element = TREE_TYPE (x);
2735 while (TREE_CODE (element) == ARRAY_TYPE)
2736 element = TREE_TYPE (element);
2737 element = TYPE_MAIN_VARIANT (element);
2739 if ((TREE_CODE (element) == RECORD_TYPE
2740 || TREE_CODE (element) == UNION_TYPE)
2741 && (TREE_CODE (x) != TYPE_DECL
2742 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2743 && !COMPLETE_TYPE_P (element))
2744 C_TYPE_INCOMPLETE_VARS (element)
2745 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2750 /* Record X as belonging to file scope.
2751 This is used only internally by the Objective-C front end,
2752 and is limited to its needs. duplicate_decls is not called;
2753 if there is any preexisting decl for this identifier, it is an ICE. */
2756 pushdecl_top_level (tree x)
2759 bool nested = false;
2760 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2762 name = DECL_NAME (x);
2764 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2766 if (TREE_PUBLIC (x))
2768 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false,
2773 bind (name, x, file_scope, /*invisible=*/false, nested, UNKNOWN_LOCATION);
2779 implicit_decl_warning (tree id, tree olddecl)
2781 if (warn_implicit_function_declaration)
2786 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2787 "implicit declaration of function %qE", id);
2789 warned = warning (OPT_Wimplicit_function_declaration,
2790 G_("implicit declaration of function %qE"), id);
2791 if (olddecl && warned)
2792 locate_old_decl (olddecl);
2796 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2797 function of type int (). */
2800 implicitly_declare (location_t loc, tree functionid)
2802 struct c_binding *b;
2806 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2808 if (B_IN_SCOPE (b, external_scope))
2817 if (decl == error_mark_node)
2820 /* FIXME: Objective-C has weird not-really-builtin functions
2821 which are supposed to be visible automatically. They wind up
2822 in the external scope because they're pushed before the file
2823 scope gets created. Catch this here and rebind them into the
2825 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2827 bind (functionid, decl, file_scope,
2828 /*invisible=*/false, /*nested=*/true,
2829 DECL_SOURCE_LOCATION (decl));
2834 tree newtype = default_function_type;
2836 TREE_TYPE (decl) = b->u.type;
2837 /* Implicit declaration of a function already declared
2838 (somehow) in a different scope, or as a built-in.
2839 If this is the first time this has happened, warn;
2840 then recycle the old declaration but with the new type. */
2841 if (!C_DECL_IMPLICIT (decl))
2843 implicit_decl_warning (functionid, decl);
2844 C_DECL_IMPLICIT (decl) = 1;
2846 if (DECL_BUILT_IN (decl))
2848 newtype = build_type_attribute_variant (newtype,
2850 (TREE_TYPE (decl)));
2851 if (!comptypes (newtype, TREE_TYPE (decl)))
2853 warning_at (loc, 0, "incompatible implicit declaration of "
2854 "built-in function %qD", decl);
2855 newtype = TREE_TYPE (decl);
2860 if (!comptypes (newtype, TREE_TYPE (decl)))
2862 error_at (loc, "incompatible implicit declaration of function %qD", decl);
2863 locate_old_decl (decl);
2866 b->u.type = TREE_TYPE (decl);
2867 TREE_TYPE (decl) = newtype;
2868 bind (functionid, decl, current_scope,
2869 /*invisible=*/false, /*nested=*/true,
2870 DECL_SOURCE_LOCATION (decl));
2875 /* Not seen before. */
2876 decl = build_decl (loc, FUNCTION_DECL, functionid, default_function_type);
2877 DECL_EXTERNAL (decl) = 1;
2878 TREE_PUBLIC (decl) = 1;
2879 C_DECL_IMPLICIT (decl) = 1;
2880 implicit_decl_warning (functionid, 0);
2881 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2883 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2885 /* C89 says implicit declarations are in the innermost block.
2886 So we record the decl in the standard fashion. */
2887 decl = pushdecl (decl);
2889 /* No need to call objc_check_decl here - it's a function type. */
2890 rest_of_decl_compilation (decl, 0, 0);
2892 /* Write a record describing this implicit function declaration
2893 to the prototypes file (if requested). */
2894 gen_aux_info_record (decl, 0, 1, 0);
2896 /* Possibly apply some default attributes to this implicit declaration. */
2897 decl_attributes (&decl, NULL_TREE, 0);
2902 /* Issue an error message for a reference to an undeclared variable
2903 ID, including a reference to a builtin outside of function-call
2904 context. Establish a binding of the identifier to error_mark_node
2905 in an appropriate scope, which will suppress further errors for the
2906 same identifier. The error message should be given location LOC. */
2908 undeclared_variable (location_t loc, tree id)
2910 static bool already = false;
2911 struct c_scope *scope;
2913 if (current_function_decl == 0)
2915 error_at (loc, "%qE undeclared here (not in a function)", id);
2916 scope = current_scope;
2920 error_at (loc, "%qE undeclared (first use in this function)", id);
2924 error_at (loc, "(Each undeclared identifier is reported only once");
2925 error_at (loc, "for each function it appears in.)");
2929 /* If we are parsing old-style parameter decls, current_function_decl
2930 will be nonnull but current_function_scope will be null. */
2931 scope = current_function_scope ? current_function_scope : current_scope;
2933 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false,
2937 /* Subroutine of lookup_label, declare_label, define_label: construct a
2938 LABEL_DECL with all the proper frills. Also create a struct
2939 c_label_vars initialized for the current scope. */
2942 make_label (location_t location, tree name, bool defining,
2943 struct c_label_vars **p_label_vars)
2945 tree label = build_decl (location, LABEL_DECL, name, void_type_node);
2946 struct c_label_vars *label_vars;
2948 DECL_CONTEXT (label) = current_function_decl;
2949 DECL_MODE (label) = VOIDmode;
2951 label_vars = GGC_NEW (struct c_label_vars);
2952 label_vars->shadowed = NULL;
2953 set_spot_bindings (&label_vars->label_bindings, defining);
2954 label_vars->decls_in_scope = make_tree_vector ();
2955 label_vars->gotos = VEC_alloc (c_goto_bindings_p, gc, 0);
2956 *p_label_vars = label_vars;
2961 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2962 Create one if none exists so far for the current function.
2963 This is called when a label is used in a goto expression or
2964 has its address taken. */
2967 lookup_label (tree name)
2970 struct c_label_vars *label_vars;
2972 if (current_function_decl == 0)
2974 error ("label %qE referenced outside of any function", name);
2978 /* Use a label already defined or ref'd with this name, but not if
2979 it is inherited from a containing function and wasn't declared
2981 label = I_LABEL_DECL (name);
2982 if (label && (DECL_CONTEXT (label) == current_function_decl
2983 || C_DECLARED_LABEL_FLAG (label)))
2985 /* If the label has only been declared, update its apparent
2986 location to point here, for better diagnostics if it
2987 turns out not to have been defined. */
2988 if (DECL_INITIAL (label) == NULL_TREE)
2989 DECL_SOURCE_LOCATION (label) = input_location;
2993 /* No label binding for that identifier; make one. */
2994 label = make_label (input_location, name, false, &label_vars);
2996 /* Ordinary labels go in the current function scope. */
2997 bind_label (name, label, current_function_scope, label_vars);
3002 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3006 warn_about_goto (location_t goto_loc, tree label, tree decl)
3008 if (variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3010 "jump into scope of identifier with variably modified type");
3012 warning_at (goto_loc, OPT_Wjump_misses_init,
3013 "jump skips variable initialization");
3014 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3015 inform (DECL_SOURCE_LOCATION (decl), "%qD declared here", decl);
3018 /* Look up a label because of a goto statement. This is like
3019 lookup_label, but also issues any appropriate warnings. */
3022 lookup_label_for_goto (location_t loc, tree name)
3025 struct c_label_vars *label_vars;
3029 label = lookup_label (name);
3030 if (label == NULL_TREE)
3033 /* If we are jumping to a different function, we can't issue any
3035 if (DECL_CONTEXT (label) != current_function_decl)
3037 gcc_assert (C_DECLARED_LABEL_FLAG (label));
3041 label_vars = I_LABEL_BINDING (name)->u.label;
3043 /* If the label has not yet been defined, then push this goto on a
3044 list for possible later warnings. */
3045 if (label_vars->label_bindings.scope == NULL)
3047 struct c_goto_bindings *g;
3049 g = GGC_NEW (struct c_goto_bindings);
3051 set_spot_bindings (&g->goto_bindings, true);
3052 VEC_safe_push (c_goto_bindings_p, gc, label_vars->gotos, g);
3056 /* If there are any decls in label_vars->decls_in_scope, then this
3057 goto has missed the declaration of the decl. This happens for a
3063 Issue a warning or error. */
3064 for (ix = 0; VEC_iterate (tree, label_vars->decls_in_scope, ix, decl); ++ix)
3065 warn_about_goto (loc, label, decl);
3067 if (label_vars->label_bindings.left_stmt_expr)
3069 error_at (loc, "jump into statement expression");
3070 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here", label);
3076 /* Make a label named NAME in the current function, shadowing silently
3077 any that may be inherited from containing functions or containing
3078 scopes. This is called for __label__ declarations. */
3081 declare_label (tree name)
3083 struct c_binding *b = I_LABEL_BINDING (name);
3085 struct c_label_vars *label_vars;
3087 /* Check to make sure that the label hasn't already been declared
3089 if (b && B_IN_CURRENT_SCOPE (b))
3091 error ("duplicate label declaration %qE", name);
3092 locate_old_decl (b->decl);
3094 /* Just use the previous declaration. */
3098 label = make_label (input_location, name, false, &label_vars);
3099 C_DECLARED_LABEL_FLAG (label) = 1;
3101 /* Declared labels go in the current scope. */
3102 bind_label (name, label, current_scope, label_vars);
3107 /* When we define a label, issue any appropriate warnings if there are
3108 any gotos earlier in the function which jump to this label. */
3111 check_earlier_gotos (tree label, struct c_label_vars* label_vars)
3114 struct c_goto_bindings *g;
3117 VEC_iterate (c_goto_bindings_p, label_vars->gotos, ix, g);
3120 struct c_binding *b;
3121 struct c_scope *scope;
3123 /* We have a goto to this label. The goto is going forward. In
3124 g->scope, the goto is going to skip any binding which was
3125 defined after g->bindings_in_scope. */
3126 for (b = g->goto_bindings.scope->bindings;
3127 b != g->goto_bindings.bindings_in_scope;
3130 if (decl_jump_unsafe (b->decl))
3131 warn_about_goto (g->loc, label, b->decl);
3134 /* We also need to warn about decls defined in any scopes
3135 between the scope of the label and the scope of the goto. */
3136 for (scope = label_vars->label_bindings.scope;
3137 scope != g->goto_bindings.scope;
3138 scope = scope->outer)
3140 gcc_assert (scope != NULL);
3141 if (scope == label_vars->label_bindings.scope)
3142 b = label_vars->label_bindings.bindings_in_scope;
3144 b = scope->bindings;
3145 for (; b != NULL; b = b->prev)
3147 if (decl_jump_unsafe (b->decl))
3148 warn_about_goto (g->loc, label, b->decl);
3152 if (g->goto_bindings.stmt_exprs > 0)
3154 error_at (g->loc, "jump into statement expression");
3155 inform (DECL_SOURCE_LOCATION (label), "label %qD defined here",
3160 /* Now that the label is defined, we will issue warnings about
3161 subsequent gotos to this label when we see them. */
3162 VEC_truncate (c_goto_bindings_p, label_vars->gotos, 0);
3163 label_vars->gotos = NULL;
3166 /* Define a label, specifying the location in the source file.
3167 Return the LABEL_DECL node for the label, if the definition is valid.
3168 Otherwise return 0. */
3171 define_label (location_t location, tree name)
3173 /* Find any preexisting label with this name. It is an error
3174 if that label has already been defined in this function, or
3175 if there is a containing function with a declared label with
3177 tree label = I_LABEL_DECL (name);
3180 && ((DECL_CONTEXT (label) == current_function_decl
3181 && DECL_INITIAL (label) != 0)
3182 || (DECL_CONTEXT (label) != current_function_decl
3183 && C_DECLARED_LABEL_FLAG (label))))
3185 error_at (location, "duplicate label %qD", label);
3186 locate_old_decl (label);
3189 else if (label && DECL_CONTEXT (label) == current_function_decl)
3191 struct c_label_vars *label_vars = I_LABEL_BINDING (name)->u.label;
3193 /* The label has been used or declared already in this function,
3194 but not defined. Update its location to point to this
3196 DECL_SOURCE_LOCATION (label) = location;
3197 set_spot_bindings (&label_vars->label_bindings, true);
3199 /* Issue warnings as required about any goto statements from
3200 earlier in the function. */
3201 check_earlier_gotos (label, label_vars);
3205 struct c_label_vars *label_vars;
3207 /* No label binding for that identifier; make one. */
3208 label = make_label (location, name, true, &label_vars);
3210 /* Ordinary labels go in the current function scope. */
3211 bind_label (name, label, current_function_scope, label_vars);
3214 if (!in_system_header && lookup_name (name))
3215 warning_at (location, OPT_Wtraditional,
3216 "traditional C lacks a separate namespace "
3217 "for labels, identifier %qE conflicts", name);
3219 /* Mark label as having been defined. */
3220 DECL_INITIAL (label) = error_mark_node;
3224 /* Get the bindings for a new switch statement. This is used to issue
3225 warnings as appropriate for jumps from the switch to case or
3228 struct c_spot_bindings *
3229 c_get_switch_bindings (void)
3231 struct c_spot_bindings *switch_bindings;
3233 switch_bindings = XNEW (struct c_spot_bindings);
3234 set_spot_bindings (switch_bindings, true);
3235 return switch_bindings;
3239 c_release_switch_bindings (struct c_spot_bindings *bindings)
3241 gcc_assert (bindings->stmt_exprs == 0 && !bindings->left_stmt_expr);
3245 /* This is called at the point of a case or default label to issue
3246 warnings about decls as needed. It returns true if it found an
3247 error, not just a warning. */
3250 c_check_switch_jump_warnings (struct c_spot_bindings *switch_bindings,
3251 location_t switch_loc, location_t case_loc)
3254 struct c_scope *scope;
3257 for (scope = current_scope;
3258 scope != switch_bindings->scope;
3259 scope = scope->outer)
3261 struct c_binding *b;
3263 gcc_assert (scope != NULL);
3264 for (b = scope->bindings; b != NULL; b = b->prev)
3266 if (decl_jump_unsafe (b->decl))
3268 if (variably_modified_type_p (TREE_TYPE (b->decl), NULL_TREE))
3272 ("switch jumps into scope of identifier with "
3273 "variably modified type"));
3276 warning_at (case_loc, OPT_Wjump_misses_init,
3277 "switch jumps over variable initialization");
3278 inform (switch_loc, "switch starts here");
3279 inform (DECL_SOURCE_LOCATION (b->decl), "%qD declared here",
3285 if (switch_bindings->stmt_exprs > 0)
3288 error_at (case_loc, "switch jumps into statement expression");
3289 inform (switch_loc, "switch starts here");
3295 /* Given NAME, an IDENTIFIER_NODE,
3296 return the structure (or union or enum) definition for that name.
3297 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3298 CODE says which kind of type the caller wants;
3299 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3300 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3301 location where the tag was defined.
3302 If the wrong kind of type is found, an error is reported. */
3305 lookup_tag (enum tree_code code, tree name, int thislevel_only,
3308 struct c_binding *b = I_TAG_BINDING (name);
3314 /* We only care about whether it's in this level if
3315 thislevel_only was set or it might be a type clash. */
3316 if (thislevel_only || TREE_CODE (b->decl) != code)
3318 /* For our purposes, a tag in the external scope is the same as
3319 a tag in the file scope. (Primarily relevant to Objective-C
3320 and its builtin structure tags, which get pushed before the
3321 file scope is created.) */
3322 if (B_IN_CURRENT_SCOPE (b)
3323 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
3327 if (thislevel_only && !thislevel)
3330 if (TREE_CODE (b->decl) != code)
3332 /* Definition isn't the kind we were looking for. */
3333 pending_invalid_xref = name;
3334 pending_invalid_xref_location = input_location;
3336 /* If in the same binding level as a declaration as a tag
3337 of a different type, this must not be allowed to
3338 shadow that tag, so give the error immediately.
3339 (For example, "struct foo; union foo;" is invalid.) */
3341 pending_xref_error ();
3350 /* Print an error message now
3351 for a recent invalid struct, union or enum cross reference.
3352 We don't print them immediately because they are not invalid
3353 when used in the `struct foo;' construct for shadowing. */
3356 pending_xref_error (void)
3358 if (pending_invalid_xref != 0)
3359 error_at (pending_invalid_xref_location, "%qE defined as wrong kind of tag",
3360 pending_invalid_xref);
3361 pending_invalid_xref = 0;
3365 /* Look up NAME in the current scope and its superiors
3366 in the namespace of variables, functions and typedefs.
3367 Return a ..._DECL node of some kind representing its definition,
3368 or return 0 if it is undefined. */
3371 lookup_name (tree name)
3373 struct c_binding *b = I_SYMBOL_BINDING (name);
3374 if (b && !b->invisible)
3379 /* Similar to `lookup_name' but look only at the indicated scope. */
3382 lookup_name_in_scope (tree name, struct c_scope *scope)
3384 struct c_binding *b;
3386 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
3387 if (B_IN_SCOPE (b, scope))
3392 /* Create the predefined scalar types of C,
3393 and some nodes representing standard constants (0, 1, (void *) 0).
3394 Initialize the global scope.
3395 Make definitions for built-in primitive functions. */
3398 c_init_decl_processing (void)
3400 location_t save_loc = input_location;
3402 /* Initialize reserved words for parser. */
3405 current_function_decl = 0;
3407 gcc_obstack_init (&parser_obstack);
3409 /* Make the externals scope. */
3411 external_scope = current_scope;
3413 /* Declarations from c_common_nodes_and_builtins must not be associated
3414 with this input file, lest we get differences between using and not
3415 using preprocessed headers. */
3416 input_location = BUILTINS_LOCATION;
3418 build_common_tree_nodes (flag_signed_char, false);
3420 c_common_nodes_and_builtins ();
3422 /* In C, comparisons and TRUTH_* expressions have type int. */
3423 truthvalue_type_node = integer_type_node;
3424 truthvalue_true_node = integer_one_node;
3425 truthvalue_false_node = integer_zero_node;
3427 /* Even in C99, which has a real boolean type. */
3428 pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),
3429 boolean_type_node));
3431 input_location = save_loc;
3433 pedantic_lvalues = true;
3435 make_fname_decl = c_make_fname_decl;
3436 start_fname_decls ();
3439 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3440 give the decl, NAME is the initialization string and TYPE_DEP
3441 indicates whether NAME depended on the type of the function. As we
3442 don't yet implement delayed emission of static data, we mark the
3443 decl as emitted so it is not placed in the output. Anything using
3444 it must therefore pull out the STRING_CST initializer directly.
3448 c_make_fname_decl (location_t loc, tree id, int type_dep)
3450 const char *name = fname_as_string (type_dep);
3451 tree decl, type, init;
3452 size_t length = strlen (name);
3454 type = build_array_type (char_type_node,
3455 build_index_type (size_int (length)));
3456 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
3458 decl = build_decl (loc, VAR_DECL, id, type);
3460 TREE_STATIC (decl) = 1;
3461 TREE_READONLY (decl) = 1;
3462 DECL_ARTIFICIAL (decl) = 1;
3464 init = build_string (length + 1, name);
3465 free (CONST_CAST (char *, name));
3466 TREE_TYPE (init) = type;
3467 DECL_INITIAL (decl) = init;
3469 TREE_USED (decl) = 1;
3471 if (current_function_decl
3472 /* For invalid programs like this:
3475 const char* p = __FUNCTION__;
3477 the __FUNCTION__ is believed to appear in K&R style function
3478 parameter declarator. In that case we still don't have
3480 && (!errorcount || current_function_scope))
3482 DECL_CONTEXT (decl) = current_function_decl;
3483 bind (id, decl, current_function_scope,
3484 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
3487 finish_decl (decl, loc, init, NULL_TREE, NULL_TREE);
3493 c_builtin_function (tree decl)
3495 tree type = TREE_TYPE (decl);
3496 tree id = DECL_NAME (decl);
3498 const char *name = IDENTIFIER_POINTER (id);
3499 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3501 /* Should never be called on a symbol with a preexisting meaning. */
3502 gcc_assert (!I_SYMBOL_BINDING (id));
3504 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false,
3507 /* Builtins in the implementation namespace are made visible without
3508 needing to be explicitly declared. See push_file_scope. */
3509 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3511 TREE_CHAIN (decl) = visible_builtins;
3512 visible_builtins = decl;
3519 c_builtin_function_ext_scope (tree decl)
3521 tree type = TREE_TYPE (decl);
3522 tree id = DECL_NAME (decl);
3524 const char *name = IDENTIFIER_POINTER (id);
3525 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
3527 /* Should never be called on a symbol with a preexisting meaning. */
3528 gcc_assert (!I_SYMBOL_BINDING (id));
3530 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false,
3533 /* Builtins in the implementation namespace are made visible without
3534 needing to be explicitly declared. See push_file_scope. */
3535 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
3537 TREE_CHAIN (decl) = visible_builtins;
3538 visible_builtins = decl;
3544 /* Called when a declaration is seen that contains no names to declare.
3545 If its type is a reference to a structure, union or enum inherited
3546 from a containing scope, shadow that tag name for the current scope
3547 with a forward reference.
3548 If its type defines a new named structure or union
3549 or defines an enum, it is valid but we need not do anything here.
3550 Otherwise, it is an error. */
3553 shadow_tag (const struct c_declspecs *declspecs)
3555 shadow_tag_warned (declspecs, 0);
3558 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3561 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
3563 bool found_tag = false;
3565 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
3567 tree value = declspecs->type;
3568 enum tree_code code = TREE_CODE (value);
3570 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3571 /* Used to test also that TYPE_SIZE (value) != 0.
3572 That caused warning for `struct foo;' at top level in the file. */
3574 tree name = TYPE_NAME (value);
3579 if (declspecs->restrict_p)
3581 error ("invalid use of %<restrict%>");
3587 if (warned != 1 && code != ENUMERAL_TYPE)
3588 /* Empty unnamed enum OK */
3590 pedwarn (input_location, 0,
3591 "unnamed struct/union that defines no instances");
3595 else if (!declspecs->tag_defined_p
3596 && declspecs->storage_class != csc_none)
3599 pedwarn (input_location, 0,
3600 "empty declaration with storage class specifier "
3601 "does not redeclare tag");
3603 pending_xref_error ();
3605 else if (!declspecs->tag_defined_p
3606 && (declspecs->const_p
3607 || declspecs->volatile_p
3608 || declspecs->restrict_p))
3611 pedwarn (input_location, 0,
3612 "empty declaration with type qualifier "
3613 "does not redeclare tag");
3615 pending_xref_error ();
3619 pending_invalid_xref = 0;
3620 t = lookup_tag (code, name, 1, NULL);
3624 t = make_node (code);
3625 pushtag (input_location, name, t);
3631 if (warned != 1 && !in_system_header)
3633 pedwarn (input_location, 0,
3634 "useless type name in empty declaration");
3639 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
3641 pedwarn (input_location, 0, "useless type name in empty declaration");
3645 pending_invalid_xref = 0;
3647 if (declspecs->inline_p)
3649 error ("%<inline%> in empty declaration");
3653 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3655 error ("%<auto%> in file-scope empty declaration");
3659 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3661 error ("%<register%> in file-scope empty declaration");
3665 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
3667 warning (0, "useless storage class specifier in empty declaration");
3671 if (!warned && !in_system_header && declspecs->thread_p)
3673 warning (0, "useless %<__thread%> in empty declaration");
3677 if (!warned && !in_system_header && (declspecs->const_p
3678 || declspecs->volatile_p
3679 || declspecs->restrict_p))
3681 warning (0, "useless type qualifier in empty declaration");
3688 pedwarn (input_location, 0, "empty declaration");
3693 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3694 bits. SPECS represents declaration specifiers that the grammar
3695 only permits to contain type qualifiers and attributes. */
3698 quals_from_declspecs (const struct c_declspecs *specs)
3700 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3701 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3702 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3703 gcc_assert (!specs->type
3704 && !specs->decl_attr
3705 && specs->typespec_word == cts_none
3706 && specs->storage_class == csc_none
3707 && !specs->typedef_p
3708 && !specs->explicit_signed_p
3709 && !specs->deprecated_p
3711 && !specs->long_long_p
3714 && !specs->unsigned_p
3715 && !specs->complex_p
3717 && !specs->thread_p);
3721 /* Construct an array declarator. LOC is the location of the
3722 beginning of the array (usually the opening brace). EXPR is the
3723 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3724 inside the [] (to be applied to the pointer to which a parameter
3725 array is converted). STATIC_P is true if "static" is inside the
3726 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3727 VLA of unspecified length which is nevertheless a complete type,
3728 false otherwise. The field for the contained declarator is left to
3729 be filled in by set_array_declarator_inner. */
3731 struct c_declarator *
3732 build_array_declarator (location_t loc,
3733 tree expr, struct c_declspecs *quals, bool static_p,
3736 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3737 struct c_declarator);
3738 declarator->id_loc = loc;
3739 declarator->kind = cdk_array;
3740 declarator->declarator = 0;
3741 declarator->u.array.dimen = expr;
3744 declarator->u.array.attrs = quals->attrs;
3745 declarator->u.array.quals = quals_from_declspecs (quals);
3749 declarator->u.array.attrs = NULL_TREE;
3750 declarator->u.array.quals = 0;
3752 declarator->u.array.static_p = static_p;
3753 declarator->u.array.vla_unspec_p = vla_unspec_p;
3756 if (static_p || quals != NULL)
3757 pedwarn (loc, OPT_pedantic,
3758 "ISO C90 does not support %<static%> or type "
3759 "qualifiers in parameter array declarators");
3761 pedwarn (loc, OPT_pedantic,
3762 "ISO C90 does not support %<[*]%> array declarators");
3766 if (!current_scope->parm_flag)
3769 error_at (loc, "%<[*]%> not allowed in other than "
3770 "function prototype scope");
3771 declarator->u.array.vla_unspec_p = false;
3774 current_scope->had_vla_unspec = true;
3779 /* Set the contained declarator of an array declarator. DECL is the
3780 declarator, as constructed by build_array_declarator; INNER is what
3781 appears on the left of the []. */
3783 struct c_declarator *
3784 set_array_declarator_inner (struct c_declarator *decl,
3785 struct c_declarator *inner)
3787 decl->declarator = inner;
3791 /* INIT is a constructor that forms DECL's initializer. If the final
3792 element initializes a flexible array field, add the size of that
3793 initializer to DECL's size. */
3796 add_flexible_array_elts_to_size (tree decl, tree init)
3800 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3803 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3804 type = TREE_TYPE (elt);
3805 if (TREE_CODE (type) == ARRAY_TYPE
3806 && TYPE_SIZE (type) == NULL_TREE
3807 && TYPE_DOMAIN (type) != NULL_TREE
3808 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3810 complete_array_type (&type, elt, false);
3812 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3813 DECL_SIZE_UNIT (decl)
3814 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3818 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3819 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3820 before the type name, and set *EXPR_CONST_OPERANDS, if
3821 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3822 appear in a constant expression. */
3825 groktypename (struct c_type_name *type_name, tree *expr,
3826 bool *expr_const_operands)
3829 tree attrs = type_name->specs->attrs;
3831 type_name->specs->attrs = NULL_TREE;
3833 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3834 false, NULL, &attrs, expr, expr_const_operands,
3837 /* Apply attributes. */
3838 decl_attributes (&type, attrs, 0);
3843 /* Decode a declarator in an ordinary declaration or data definition.
3844 This is called as soon as the type information and variable name
3845 have been parsed, before parsing the initializer if any.
3846 Here we create the ..._DECL node, fill in its type,
3847 and put it on the list of decls for the current context.
3848 The ..._DECL node is returned as the value.
3850 Exception: for arrays where the length is not specified,
3851 the type is left null, to be filled in by `finish_decl'.
3853 Function definitions do not come here; they go to start_function
3854 instead. However, external and forward declarations of functions
3855 do go through here. Structure field declarations are done by
3856 grokfield and not through here. */
3859 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3860 bool initialized, tree attributes)
3864 tree expr = NULL_TREE;
3865 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3867 /* An object declared as __attribute__((deprecated)) suppresses
3868 warnings of uses of other deprecated items. */
3869 if (lookup_attribute ("deprecated", attributes))
3870 deprecated_state = DEPRECATED_SUPPRESS;
3872 decl = grokdeclarator (declarator, declspecs,
3873 NORMAL, initialized, NULL, &attributes, &expr, NULL,
3881 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
3882 warning (OPT_Wmain, "%q+D is usually a function", decl);
3885 /* Is it valid for this decl to have an initializer at all?
3886 If not, set INITIALIZED to zero, which will indirectly
3887 tell 'finish_decl' to ignore the initializer once it is parsed. */
3888 switch (TREE_CODE (decl))
3891 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3896 error ("function %qD is initialized like a variable", decl);
3901 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3902 error ("parameter %qD is initialized", decl);
3907 /* Don't allow initializations for incomplete types except for
3908 arrays which might be completed by the initialization. */
3910 /* This can happen if the array size is an undefined macro.
3911 We already gave a warning, so we don't need another one. */
3912 if (TREE_TYPE (decl) == error_mark_node)
3914 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3916 /* A complete type is ok if size is fixed. */
3918 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3919 || C_DECL_VARIABLE_SIZE (decl))
3921 error ("variable-sized object may not be initialized");
3925 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3927 error ("variable %qD has initializer but incomplete type", decl);
3930 else if (C_DECL_VARIABLE_SIZE (decl))
3932 /* Although C99 is unclear about whether incomplete arrays
3933 of VLAs themselves count as VLAs, it does not make
3934 sense to permit them to be initialized given that
3935 ordinary VLAs may not be initialized. */
3936 error ("variable-sized object may not be initialized");
3943 if (current_scope == file_scope)
3944 TREE_STATIC (decl) = 1;
3946 /* Tell 'pushdecl' this is an initialized decl
3947 even though we don't yet have the initializer expression.
3948 Also tell 'finish_decl' it may store the real initializer. */
3949 DECL_INITIAL (decl) = error_mark_node;
3952 /* If this is a function declaration, write a record describing it to the
3953 prototypes file (if requested). */
3955 if (TREE_CODE (decl) == FUNCTION_DECL)
3956 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3958 /* ANSI specifies that a tentative definition which is not merged with
3959 a non-tentative definition behaves exactly like a definition with an
3960 initializer equal to zero. (Section 3.7.2)
3962 -fno-common gives strict ANSI behavior, though this tends to break
3963 a large body of code that grew up without this rule.
3965 Thread-local variables are never common, since there's no entrenched
3966 body of code to break, and it allows more efficient variable references
3967 in the presence of dynamic linking. */
3969 if (TREE_CODE (decl) == VAR_DECL
3971 && TREE_PUBLIC (decl)
3972 && !DECL_THREAD_LOCAL_P (decl)
3974 DECL_COMMON (decl) = 1;
3976 /* Set attributes here so if duplicate decl, will have proper attributes. */
3977 decl_attributes (&decl, attributes, 0);
3979 /* Handle gnu_inline attribute. */
3980 if (declspecs->inline_p
3981 && !flag_gnu89_inline
3982 && TREE_CODE (decl) == FUNCTION_DECL
3983 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
3984 || current_function_decl))
3986 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3988 else if (declspecs->storage_class != csc_static)
3989 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3992 if (TREE_CODE (decl) == FUNCTION_DECL
3993 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3995 struct c_declarator *ce = declarator;
3997 if (ce->kind == cdk_pointer)
3998 ce = declarator->declarator;
3999 if (ce->kind == cdk_function)
4001 tree args = ce->u.arg_info->parms;
4002 for (; args; args = TREE_CHAIN (args))
4004 tree type = TREE_TYPE (args);
4005 if (type && INTEGRAL_TYPE_P (type)
4006 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4007 DECL_ARG_TYPE (args) = integer_type_node;
4012 if (TREE_CODE (decl) == FUNCTION_DECL
4013 && DECL_DECLARED_INLINE_P (decl)
4014 && DECL_UNINLINABLE (decl)
4015 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4016 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
4019 /* C99 6.7.4p3: An inline definition of a function with external
4020 linkage shall not contain a definition of a modifiable object
4021 with static storage duration... */
4022 if (TREE_CODE (decl) == VAR_DECL
4023 && current_scope != file_scope
4024 && TREE_STATIC (decl)
4025 && !TREE_READONLY (decl)
4026 && DECL_DECLARED_INLINE_P (current_function_decl)
4027 && DECL_EXTERNAL (current_function_decl))
4028 record_inline_static (input_location, current_function_decl,
4029 decl, csi_modifiable);
4031 /* Add this decl to the current scope.
4032 TEM may equal DECL or it may be a previous decl of the same name. */
4033 tem = pushdecl (decl);
4035 if (initialized && DECL_EXTERNAL (tem))
4037 DECL_EXTERNAL (tem) = 0;
4038 TREE_STATIC (tem) = 1;
4044 /* Finish processing of a declaration;
4045 install its initial value.
4046 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4047 If the length of an array type is not known before,
4048 it must be determined now, from the initial value, or it is an error.
4050 INIT_LOC is the location of the initial value. */
4053 finish_decl (tree decl, location_t init_loc, tree init,
4054 tree origtype, tree asmspec_tree)
4057 bool was_incomplete = (DECL_SIZE (decl) == 0);
4058 const char *asmspec = 0;
4060 /* If a name was specified, get the string. */
4061 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
4062 && DECL_FILE_SCOPE_P (decl))
4063 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4065 asmspec = TREE_STRING_POINTER (asmspec_tree);
4067 /* If `start_decl' didn't like having an initialization, ignore it now. */
4068 if (init != 0 && DECL_INITIAL (decl) == 0)
4071 /* Don't crash if parm is initialized. */
4072 if (TREE_CODE (decl) == PARM_DECL)
4076 store_init_value (init_loc, decl, init, origtype);
4078 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4079 || TREE_CODE (decl) == FUNCTION_DECL
4080 || TREE_CODE (decl) == FIELD_DECL))
4081 objc_check_decl (decl);
4083 type = TREE_TYPE (decl);
4085 /* Deduce size of array from initialization, if not already known. */
4086 if (TREE_CODE (type) == ARRAY_TYPE
4087 && TYPE_DOMAIN (type) == 0
4088 && TREE_CODE (decl) != TYPE_DECL)
4091 = (TREE_STATIC (decl)
4092 /* Even if pedantic, an external linkage array
4093 may have incomplete type at first. */
4094 ? pedantic && !TREE_PUBLIC (decl)
4095 : !DECL_EXTERNAL (decl));
4097 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4100 /* Get the completed type made by complete_array_type. */
4101 type = TREE_TYPE (decl);
4106 error ("initializer fails to determine size of %q+D", decl);
4111 error ("array size missing in %q+D", decl);
4112 /* If a `static' var's size isn't known,
4113 make it extern as well as static, so it does not get
4115 If it is not `static', then do not mark extern;
4116 finish_incomplete_decl will give it a default size
4117 and it will get allocated. */
4118 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4119 DECL_EXTERNAL (decl) = 1;
4123 error ("zero or negative size array %q+D", decl);
4127 /* For global variables, update the copy of the type that
4128 exists in the binding. */
4129 if (TREE_PUBLIC (decl))
4131 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4132 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4133 b_ext = b_ext->shadowed;
4137 b_ext->u.type = composite_type (b_ext->u.type, type);
4139 b_ext->u.type = type;
4148 if (DECL_INITIAL (decl))
4149 TREE_TYPE (DECL_INITIAL (decl)) = type;
4151 layout_decl (decl, 0);
4154 if (TREE_CODE (decl) == VAR_DECL)
4156 if (init && TREE_CODE (init) == CONSTRUCTOR)
4157 add_flexible_array_elts_to_size (decl, init);
4159 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4160 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4161 layout_decl (decl, 0);
4163 if (DECL_SIZE (decl) == 0
4164 /* Don't give an error if we already gave one earlier. */
4165 && TREE_TYPE (decl) != error_mark_node
4166 && (TREE_STATIC (decl)
4167 /* A static variable with an incomplete type
4168 is an error if it is initialized.
4169 Also if it is not file scope.
4170 Otherwise, let it through, but if it is not `extern'
4171 then it may cause an error message later. */
4172 ? (DECL_INITIAL (decl) != 0
4173 || !DECL_FILE_SCOPE_P (decl))
4174 /* An automatic variable with an incomplete type
4176 : !DECL_EXTERNAL (decl)))
4178 error ("storage size of %q+D isn%'t known", decl);
4179 TREE_TYPE (decl) = error_mark_node;
4182 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4183 && DECL_SIZE (decl) != 0)
4185 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4186 constant_expression_warning (DECL_SIZE (decl));
4189 error ("storage size of %q+D isn%'t constant", decl);
4190 TREE_TYPE (decl) = error_mark_node;
4194 if (TREE_USED (type))
4195 TREE_USED (decl) = 1;
4198 /* If this is a function and an assembler name is specified, reset DECL_RTL
4199 so we can give it its new name. Also, update built_in_decls if it
4200 was a normal built-in. */
4201 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4203 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4204 set_builtin_user_assembler_name (decl, asmspec);
4205 set_user_assembler_name (decl, asmspec);
4208 /* If #pragma weak was used, mark the decl weak now. */
4209 maybe_apply_pragma_weak (decl);
4211 /* Output the assembler code and/or RTL code for variables and functions,
4212 unless the type is an undefined structure or union.
4213 If not, it will get done when the type is completed. */
4215 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4217 /* Determine the ELF visibility. */
4218 if (TREE_PUBLIC (decl))
4219 c_determine_visibility (decl);
4221 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4222 if (c_dialect_objc ())
4223 objc_check_decl (decl);
4227 /* If this is not a static variable, issue a warning.
4228 It doesn't make any sense to give an ASMSPEC for an
4229 ordinary, non-register local variable. Historically,
4230 GCC has accepted -- but ignored -- the ASMSPEC in
4232 if (!DECL_FILE_SCOPE_P (decl)
4233 && TREE_CODE (decl) == VAR_DECL
4234 && !C_DECL_REGISTER (decl)
4235 && !TREE_STATIC (decl))
4236 warning (0, "ignoring asm-specifier for non-static local "
4237 "variable %q+D", decl);
4239 set_user_assembler_name (decl, asmspec);
4242 if (DECL_FILE_SCOPE_P (decl))
4244 if (DECL_INITIAL (decl) == NULL_TREE
4245 || DECL_INITIAL (decl) == error_mark_node)
4246 /* Don't output anything
4247 when a tentative file-scope definition is seen.
4248 But at end of compilation, do output code for them. */
4249 DECL_DEFER_OUTPUT (decl) = 1;
4250 rest_of_decl_compilation (decl, true, 0);
4254 /* In conjunction with an ASMSPEC, the `register'
4255 keyword indicates that we should place the variable
4256 in a particular register. */
4257 if (asmspec && C_DECL_REGISTER (decl))
4259 DECL_HARD_REGISTER (decl) = 1;
4260 /* This cannot be done for a structure with volatile
4261 fields, on which DECL_REGISTER will have been
4263 if (!DECL_REGISTER (decl))
4264 error ("cannot put object with volatile field into register");
4267 if (TREE_CODE (decl) != FUNCTION_DECL)
4269 /* If we're building a variable sized type, and we might be
4270 reachable other than via the top of the current binding
4271 level, then create a new BIND_EXPR so that we deallocate
4272 the object at the right time. */
4273 /* Note that DECL_SIZE can be null due to errors. */
4274 if (DECL_SIZE (decl)
4275 && !TREE_CONSTANT (DECL_SIZE (decl))
4276 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4279 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4280 TREE_SIDE_EFFECTS (bind) = 1;
4282 BIND_EXPR_BODY (bind) = push_stmt_list ();
4284 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4290 if (!DECL_FILE_SCOPE_P (decl))
4292 /* Recompute the RTL of a local array now
4293 if it used to be an incomplete type. */
4295 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4297 /* If we used it already as memory, it must stay in memory. */
4298 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4299 /* If it's still incomplete now, no init will save it. */
4300 if (DECL_SIZE (decl) == 0)
4301 DECL_INITIAL (decl) = 0;
4306 if (TREE_CODE (decl) == TYPE_DECL)
4308 if (!DECL_FILE_SCOPE_P (decl)
4309 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4310 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4312 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4315 /* At the end of a declaration, throw away any variable type sizes
4316 of types defined inside that declaration. There is no use
4317 computing them in the following function definition. */
4318 if (current_scope == file_scope)
4319 get_pending_sizes ();
4321 /* Install a cleanup (aka destructor) if one was given. */
4322 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4324 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4327 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4328 tree cleanup_decl = lookup_name (cleanup_id);
4332 /* Build "cleanup(&decl)" for the destructor. */
4333 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4334 vec = VEC_alloc (tree, gc, 1);
4335 VEC_quick_push (tree, vec, cleanup);
4336 cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4337 cleanup_decl, vec, NULL);
4338 VEC_free (tree, gc, vec);
4340 /* Don't warn about decl unused; the cleanup uses it. */
4341 TREE_USED (decl) = 1;
4342 TREE_USED (cleanup_decl) = 1;
4344 push_cleanup (decl, cleanup, false);
4349 && TREE_CODE (decl) == VAR_DECL
4350 && TREE_READONLY (decl)
4351 && !DECL_EXTERNAL (decl)
4352 && DECL_INITIAL (decl) == NULL_TREE)
4353 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4354 "uninitialized const %qD is invalid in C++", decl);
4357 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4360 grokparm (const struct c_parm *parm)
4362 tree attrs = parm->attrs;
4363 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4364 NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL);
4366 decl_attributes (&decl, attrs, 0);
4371 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4372 and push that on the current scope. */
4375 push_parm_decl (const struct c_parm *parm)
4377 tree attrs = parm->attrs;
4380 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4381 &attrs, NULL, NULL, DEPRECATED_NORMAL);
4382 decl_attributes (&decl, attrs, 0);
4384 decl = pushdecl (decl);
4386 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4389 /* Mark all the parameter declarations to date as forward decls.
4390 Also diagnose use of this extension. */
4393 mark_forward_parm_decls (void)
4395 struct c_binding *b;
4397 if (pedantic && !current_scope->warned_forward_parm_decls)
4399 pedwarn (input_location, OPT_pedantic,
4400 "ISO C forbids forward parameter declarations");
4401 current_scope->warned_forward_parm_decls = true;
4404 for (b = current_scope->bindings; b; b = b->prev)
4405 if (TREE_CODE (b->decl) == PARM_DECL)
4406 TREE_ASM_WRITTEN (b->decl) = 1;
4409 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4410 literal, which may be an incomplete array type completed by the
4411 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4412 literal. NON_CONST is true if the initializers contain something
4413 that cannot occur in a constant expression. */
4416 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4418 /* We do not use start_decl here because we have a type, not a declarator;
4419 and do not use finish_decl because the decl should be stored inside
4420 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4425 if (type == error_mark_node)
4426 return error_mark_node;
4428 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4429 DECL_EXTERNAL (decl) = 0;
4430 TREE_PUBLIC (decl) = 0;
4431 TREE_STATIC (decl) = (current_scope == file_scope);
4432 DECL_CONTEXT (decl) = current_function_decl;
4433 TREE_USED (decl) = 1;
4434 TREE_TYPE (decl) = type;
4435 TREE_READONLY (decl) = TYPE_READONLY (type);
4436 store_init_value (loc, decl, init, NULL_TREE);
4438 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4440 int failure = complete_array_type (&TREE_TYPE (decl),
4441 DECL_INITIAL (decl), true);
4442 gcc_assert (!failure);
4444 type = TREE_TYPE (decl);
4445 TREE_TYPE (DECL_INITIAL (decl)) = type;
4448 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4449 return error_mark_node;
4451 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4452 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4453 TREE_SIDE_EFFECTS (complit) = 1;
4455 layout_decl (decl, 0);
4457 if (TREE_STATIC (decl))
4459 /* This decl needs a name for the assembler output. */
4460 set_compound_literal_name (decl);
4461 DECL_DEFER_OUTPUT (decl) = 1;
4462 DECL_COMDAT (decl) = 1;
4463 DECL_ARTIFICIAL (decl) = 1;
4464 DECL_IGNORED_P (decl) = 1;
4466 rest_of_decl_compilation (decl, 1, 0);
4471 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4472 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4478 /* Check the type of a compound literal. Here we just check that it
4479 is valid for C++. */
4482 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4484 if (warn_cxx_compat && type_name->specs->tag_defined_p)
4485 warning_at (loc, OPT_Wc___compat,
4486 "defining a type in a compound literal is invalid in C++");
4489 /* Determine whether TYPE is a structure with a flexible array member,
4490 or a union containing such a structure (possibly recursively). */
4493 flexible_array_type_p (tree type)
4496 switch (TREE_CODE (type))
4499 x = TYPE_FIELDS (type);
4502 while (TREE_CHAIN (x) != NULL_TREE)
4504 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4505 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4506 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4507 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4511 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
4513 if (flexible_array_type_p (TREE_TYPE (x)))
4522 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4523 replacing with appropriate values if they are invalid. */
4525 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4528 unsigned int max_width;
4529 unsigned HOST_WIDE_INT w;
4530 const char *name = (orig_name
4531 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4532 : _("<anonymous>"));
4534 /* Detect and ignore out of range field width and process valid
4536 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
4537 || TREE_CODE (*width) != INTEGER_CST)
4539 error ("bit-field %qs width not an integer constant", name);
4540 *width = integer_one_node;
4544 constant_expression_warning (*width);
4545 if (tree_int_cst_sgn (*width) < 0)
4547 error ("negative width in bit-field %qs", name);
4548 *width = integer_one_node;
4550 else if (integer_zerop (*width) && orig_name)
4552 error ("zero width for bit-field %qs", name);
4553 *width = integer_one_node;
4557 /* Detect invalid bit-field type. */
4558 if (TREE_CODE (*type) != INTEGER_TYPE
4559 && TREE_CODE (*type) != BOOLEAN_TYPE
4560 && TREE_CODE (*type) != ENUMERAL_TYPE)
4562 error ("bit-field %qs has invalid type", name);
4563 *type = unsigned_type_node;
4566 type_mv = TYPE_MAIN_VARIANT (*type);
4567 if (!in_system_header
4568 && type_mv != integer_type_node
4569 && type_mv != unsigned_type_node
4570 && type_mv != boolean_type_node)
4571 pedwarn (input_location, OPT_pedantic,
4572 "type of bit-field %qs is a GCC extension", name);
4574 max_width = TYPE_PRECISION (*type);
4576 if (0 < compare_tree_int (*width, max_width))
4578 error ("width of %qs exceeds its type", name);
4580 *width = build_int_cst (NULL_TREE, w);
4583 w = tree_low_cst (*width, 1);
4585 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4587 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4589 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
4590 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
4591 warning (0, "%qs is narrower than values of its type", name);
4597 /* Print warning about variable length array if necessary. */
4600 warn_variable_length_array (tree name, tree size)
4602 int const_size = TREE_CONSTANT (size);
4604 if (!flag_isoc99 && pedantic && warn_vla != 0)
4609 pedwarn (input_location, OPT_Wvla,
4610 "ISO C90 forbids array %qE whose size "
4611 "can%'t be evaluated",
4614 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4615 "can%'t be evaluated");
4620 pedwarn (input_location, OPT_Wvla,
4621 "ISO C90 forbids variable length array %qE",
4624 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4627 else if (warn_vla > 0)
4633 "the size of array %qE can"
4634 "%'t be evaluated", name);
4637 "the size of array can %'t be evaluated");
4643 "variable length array %qE is used",
4647 "variable length array is used");
4652 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4653 serve as the actual size-expression for a type or decl. This is
4654 like variable_size in stor-layout.c, but we make global_bindings_p
4655 return negative to avoid calls to that function from outside the
4656 front end resulting in errors at file scope, then call this version
4657 instead from front-end code. */
4660 c_variable_size (tree size)
4664 if (TREE_CONSTANT (size))
4667 size = save_expr (size);
4669 save = skip_simple_arithmetic (size);
4671 if (cfun && cfun->dont_save_pending_sizes_p)
4674 if (!global_bindings_p ())
4675 put_pending_size (save);
4680 /* Given declspecs and a declarator,
4681 determine the name and type of the object declared
4682 and construct a ..._DECL node for it.
4683 (In one case we can return a ..._TYPE node instead.
4684 For invalid input we sometimes return 0.)
4686 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4688 DECL_CONTEXT says which syntactic context this declaration is in:
4689 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4690 FUNCDEF for a function definition. Like NORMAL but a few different
4691 error messages in each case. Return value may be zero meaning
4692 this definition is too screwy to try to parse.
4693 PARM for a parameter declaration (either within a function prototype
4694 or before a function body). Make a PARM_DECL, or return void_type_node.
4695 TYPENAME if for a typename (in a cast or sizeof).
4696 Don't make a DECL node; just return the ..._TYPE node.
4697 FIELD for a struct or union field; make a FIELD_DECL.
4698 INITIALIZED is true if the decl has an initializer.
4699 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4700 representing the width of the bit-field.
4701 DECL_ATTRS points to the list of attributes that should be added to this
4702 decl. Any nested attributes that belong on the decl itself will be
4704 If EXPR is not NULL, any expressions that need to be evaluated as
4705 part of evaluating variably modified types will be stored in *EXPR.
4706 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4707 set to indicate whether operands in *EXPR can be used in constant
4709 DEPRECATED_STATE is a deprecated_states value indicating whether
4710 deprecation warnings should be suppressed.
4712 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4713 It may also be so in the PARM case, for a prototype where the
4714 argument type is specified but not the name.
4716 This function is where the complicated C meanings of `static'
4717 and `extern' are interpreted. */
4720 grokdeclarator (const struct c_declarator *declarator,
4721 struct c_declspecs *declspecs,
4722 enum decl_context decl_context, bool initialized, tree *width,
4723 tree *decl_attrs, tree *expr, bool *expr_const_operands,
4724 enum deprecated_states deprecated_state)
4726 tree type = declspecs->type;
4727 bool threadp = declspecs->thread_p;
4728 enum c_storage_class storage_class = declspecs->storage_class;
4732 int type_quals = TYPE_UNQUALIFIED;
4733 tree name = NULL_TREE;
4734 bool funcdef_flag = false;
4735 bool funcdef_syntax = false;
4736 bool size_varies = false;
4737 tree decl_attr = declspecs->decl_attr;
4738 int array_ptr_quals = TYPE_UNQUALIFIED;
4739 tree array_ptr_attrs = NULL_TREE;
4740 int array_parm_static = 0;
4741 bool array_parm_vla_unspec_p = false;
4742 tree returned_attrs = NULL_TREE;
4743 bool bitfield = width != NULL;
4745 struct c_arg_info *arg_info = 0;
4746 location_t loc = UNKNOWN_LOCATION;
4749 bool expr_const_operands_dummy;
4753 if (expr_const_operands == NULL)
4754 expr_const_operands = &expr_const_operands_dummy;
4756 *expr = declspecs->expr;
4757 *expr_const_operands = declspecs->expr_const_operands;
4759 if (decl_context == FUNCDEF)
4760 funcdef_flag = true, decl_context = NORMAL;
4762 /* Look inside a declarator for the name being declared
4763 and get it as an IDENTIFIER_NODE, for an error message. */
4765 const struct c_declarator *decl = declarator;
4776 funcdef_syntax = (decl->kind == cdk_function);
4777 decl = decl->declarator;
4781 decl = decl->declarator;
4796 gcc_assert (decl_context == PARM
4797 || decl_context == TYPENAME
4798 || (decl_context == FIELD
4799 && declarator->kind == cdk_id));
4800 gcc_assert (!initialized);
4804 /* A function definition's declarator must have the form of
4805 a function declarator. */
4807 if (funcdef_flag && !funcdef_syntax)
4810 /* If this looks like a function definition, make it one,
4811 even if it occurs where parms are expected.
4812 Then store_parm_decls will reject it and not use it as a parm. */
4813 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4814 decl_context = PARM;
4816 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4817 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
4819 if ((decl_context == NORMAL || decl_context == FIELD)
4820 && current_scope == file_scope
4821 && variably_modified_type_p (type, NULL_TREE))
4824 error_at (loc, "variably modified %qE at file scope", name);
4826 error_at (loc, "variably modified field at file scope");
4827 type = integer_type_node;
4830 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
4832 /* Diagnose defaulting to "int". */
4834 if (declspecs->default_int_p && !in_system_header)
4836 /* Issue a warning if this is an ISO C 99 program or if
4837 -Wreturn-type and this is a function, or if -Wimplicit;
4838 prefer the former warning since it is more explicit. */
4839 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4841 warn_about_return_type = 1;
4845 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4846 "type defaults to %<int%> in declaration of %qE",
4849 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4850 "type defaults to %<int%> in type name");
4854 /* Adjust the type if a bit-field is being declared,
4855 -funsigned-bitfields applied and the type is not explicitly
4857 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4858 && TREE_CODE (type) == INTEGER_TYPE)
4859 type = unsigned_type_for (type);
4861 /* Figure out the type qualifiers for the declaration. There are
4862 two ways a declaration can become qualified. One is something
4863 like `const int i' where the `const' is explicit. Another is
4864 something like `typedef const int CI; CI i' where the type of the
4865 declaration contains the `const'. A third possibility is that
4866 there is a type qualifier on the element type of a typedefed
4867 array type, in which case we should extract that qualifier so
4868 that c_apply_type_quals_to_decl receives the full list of
4869 qualifiers to work with (C90 is not entirely clear about whether
4870 duplicate qualifiers should be diagnosed in this case, but it
4871 seems most appropriate to do so). */
4872 element_type = strip_array_types (type);
4873 constp = declspecs->const_p + TYPE_READONLY (element_type);
4874 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4875 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4876 if (pedantic && !flag_isoc99)
4879 pedwarn (loc, OPT_pedantic, "duplicate %<const%>");
4881 pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>");
4883 pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>");
4885 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4886 type = TYPE_MAIN_VARIANT (type);
4887 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4888 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4889 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4891 /* Warn about storage classes that are invalid for certain
4892 kinds of declarations (parameters, typenames, etc.). */
4896 || storage_class == csc_auto
4897 || storage_class == csc_register
4898 || storage_class == csc_typedef))
4900 if (storage_class == csc_auto)
4902 (current_scope == file_scope) ? 0 : OPT_pedantic,
4903 "function definition declared %<auto%>");
4904 if (storage_class == csc_register)
4905 error_at (loc, "function definition declared %<register%>");
4906 if (storage_class == csc_typedef)
4907 error_at (loc, "function definition declared %<typedef%>");
4909 error_at (loc, "function definition declared %<__thread%>");
4911 if (storage_class == csc_auto
4912 || storage_class == csc_register
4913 || storage_class == csc_typedef)
4914 storage_class = csc_none;
4916 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4918 if (decl_context == PARM && storage_class == csc_register)
4922 switch (decl_context)
4926 error_at (loc, "storage class specified for structure "
4929 error_at (loc, "storage class specified for structure field");
4933 error_at (loc, "storage class specified for parameter %qE",
4936 error_at (loc, "storage class specified for unnamed parameter");
4939 error_at (loc, "storage class specified for typename");
4942 storage_class = csc_none;
4946 else if (storage_class == csc_extern
4950 /* 'extern' with initialization is invalid if not at file scope. */
4951 if (current_scope == file_scope)
4953 /* It is fine to have 'extern const' when compiling at C
4954 and C++ intersection. */
4955 if (!(warn_cxx_compat && constp))
4956 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
4960 error_at (loc, "%qE has both %<extern%> and initializer", name);
4962 else if (current_scope == file_scope)
4964 if (storage_class == csc_auto)
4965 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
4967 if (pedantic && storage_class == csc_register)
4968 pedwarn (input_location, OPT_pedantic,
4969 "file-scope declaration of %qE specifies %<register%>", name);
4973 if (storage_class == csc_extern && funcdef_flag)
4974 error_at (loc, "nested function %qE declared %<extern%>", name);
4975 else if (threadp && storage_class == csc_none)
4977 error_at (loc, "function-scope %qE implicitly auto and declared "
4984 /* Now figure out the structure of the declarator proper.
4985 Descend through it, creating more complex types, until we reach
4986 the declared identifier (or NULL_TREE, in an absolute declarator).
4987 At each stage we maintain an unqualified version of the type
4988 together with any qualifiers that should be applied to it with
4989 c_build_qualified_type; this way, array types including
4990 multidimensional array types are first built up in unqualified
4991 form and then the qualified form is created with
4992 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4994 while (declarator && declarator->kind != cdk_id)
4996 if (type == error_mark_node)
4998 declarator = declarator->declarator;
5002 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5003 a cdk_pointer (for *...),
5004 a cdk_function (for ...(...)),
5005 a cdk_attrs (for nested attributes),
5006 or a cdk_id (for the name being declared
5007 or the place in an absolute declarator
5008 where the name was omitted).
5009 For the last case, we have just exited the loop.
5011 At this point, TYPE is the type of elements of an array,
5012 or for a function to return, or for a pointer to point to.
5013 After this sequence of ifs, TYPE is the type of the
5014 array or function or pointer, and DECLARATOR has had its
5015 outermost layer removed. */
5017 if (array_ptr_quals != TYPE_UNQUALIFIED
5018 || array_ptr_attrs != NULL_TREE
5019 || array_parm_static)
5021 /* Only the innermost declarator (making a parameter be of
5022 array type which is converted to pointer type)
5023 may have static or type qualifiers. */
5024 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5025 array_ptr_quals = TYPE_UNQUALIFIED;
5026 array_ptr_attrs = NULL_TREE;
5027 array_parm_static = 0;
5030 switch (declarator->kind)
5034 /* A declarator with embedded attributes. */
5035 tree attrs = declarator->u.attrs;
5036 const struct c_declarator *inner_decl;
5038 declarator = declarator->declarator;
5039 inner_decl = declarator;
5040 while (inner_decl->kind == cdk_attrs)
5041 inner_decl = inner_decl->declarator;
5042 if (inner_decl->kind == cdk_id)
5043 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5044 else if (inner_decl->kind == cdk_function)
5045 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5046 else if (inner_decl->kind == cdk_array)
5047 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5048 returned_attrs = decl_attributes (&type,
5049 chainon (returned_attrs, attrs),
5055 tree itype = NULL_TREE;
5056 tree size = declarator->u.array.dimen;
5057 /* The index is a signed object `sizetype' bits wide. */
5058 tree index_type = c_common_signed_type (sizetype);
5060 array_ptr_quals = declarator->u.array.quals;
5061 array_ptr_attrs = declarator->u.array.attrs;
5062 array_parm_static = declarator->u.array.static_p;
5063 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5065 declarator = declarator->declarator;
5067 /* Check for some types that there cannot be arrays of. */
5069 if (VOID_TYPE_P (type))
5072 error_at (loc, "declaration of %qE as array of voids", name);
5074 error_at (loc, "declaration of type name as array of voids");
5075 type = error_mark_node;
5078 if (TREE_CODE (type) == FUNCTION_TYPE)
5081 error_at (loc, "declaration of %qE as array of functions",
5084 error_at (loc, "declaration of type name as array of "
5086 type = error_mark_node;
5089 if (pedantic && !in_system_header && flexible_array_type_p (type))
5090 pedwarn (loc, OPT_pedantic,
5091 "invalid use of structure with flexible array member");
5093 if (size == error_mark_node)
5094 type = error_mark_node;
5096 if (type == error_mark_node)
5099 /* If size was specified, set ITYPE to a range-type for
5100 that size. Otherwise, ITYPE remains null. finish_decl
5101 may figure it out from an initial value. */
5105 bool size_maybe_const = true;
5106 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5107 && !TREE_OVERFLOW (size));
5108 bool this_size_varies = false;
5110 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5112 STRIP_TYPE_NOPS (size);
5114 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5117 error_at (loc, "size of array %qE has non-integer type",
5121 "size of unnamed array has non-integer type");
5122 size = integer_one_node;
5125 size = c_fully_fold (size, false, &size_maybe_const);
5127 if (pedantic && size_maybe_const && integer_zerop (size))
5130 pedwarn (loc, OPT_pedantic,
5131 "ISO C forbids zero-size array %qE", name);
5133 pedwarn (loc, OPT_pedantic,
5134 "ISO C forbids zero-size array");
5137 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5139 constant_expression_warning (size);
5140 if (tree_int_cst_sgn (size) < 0)
5143 error_at (loc, "size of array %qE is negative", name);
5145 error_at (loc, "size of unnamed array is negative");
5146 size = integer_one_node;
5148 /* Handle a size folded to an integer constant but
5149 not an integer constant expression. */
5150 if (!size_int_const)
5152 /* If this is a file scope declaration of an
5153 ordinary identifier, this is invalid code;
5154 diagnosing it here and not subsequently
5155 treating the type as variable-length avoids
5156 more confusing diagnostics later. */
5157 if ((decl_context == NORMAL || decl_context == FIELD)
5158 && current_scope == file_scope)
5159 pedwarn (input_location, 0,
5160 "variably modified %qE at file scope",
5163 this_size_varies = size_varies = true;
5164 warn_variable_length_array (name, size);
5167 else if ((decl_context == NORMAL || decl_context == FIELD)
5168 && current_scope == file_scope)
5170 error_at (loc, "variably modified %qE at file scope", name);
5171 size = integer_one_node;
5175 /* Make sure the array size remains visibly
5176 nonconstant even if it is (eg) a const variable
5177 with known value. */
5178 this_size_varies = size_varies = true;
5179 warn_variable_length_array (name, size);
5182 if (integer_zerop (size) && !this_size_varies)
5184 /* A zero-length array cannot be represented with
5185 an unsigned index type, which is what we'll
5186 get with build_index_type. Create an
5187 open-ended range instead. */
5188 itype = build_range_type (sizetype, size, NULL_TREE);
5192 /* Arrange for the SAVE_EXPR on the inside of the
5193 MINUS_EXPR, which allows the -1 to get folded
5194 with the +1 that happens when building TYPE_SIZE. */
5196 size = c_variable_size (size);
5197 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5198 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5199 integer_zero_node, size);
5201 /* Compute the maximum valid index, that is, size
5202 - 1. Do the calculation in index_type, so that
5203 if it is a variable the computations will be
5204 done in the proper mode. */
5205 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5206 convert (index_type, size),
5207 convert (index_type,
5210 /* If that overflowed, the array is too big. ???
5211 While a size of INT_MAX+1 technically shouldn't
5212 cause an overflow (because we subtract 1), the
5213 overflow is recorded during the conversion to
5214 index_type, before the subtraction. Handling
5215 this case seems like an unnecessary
5217 if (TREE_CODE (itype) == INTEGER_CST
5218 && TREE_OVERFLOW (itype))
5221 error_at (loc, "size of array %qE is too large",
5224 error_at (loc, "size of unnamed array is too large");
5225 type = error_mark_node;
5229 itype = build_index_type (itype);
5231 if (this_size_varies)
5234 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5238 *expr_const_operands &= size_maybe_const;
5241 else if (decl_context == FIELD)
5243 bool flexible_array_member = false;
5244 if (array_parm_vla_unspec_p)
5245 /* Field names can in fact have function prototype
5246 scope so [*] is disallowed here through making
5247 the field variably modified, not through being
5248 something other than a declaration with function
5253 const struct c_declarator *t = declarator;
5254 while (t->kind == cdk_attrs)
5256 flexible_array_member = (t->kind == cdk_id);
5258 if (flexible_array_member
5259 && pedantic && !flag_isoc99 && !in_system_header)
5260 pedwarn (loc, OPT_pedantic,
5261 "ISO C90 does not support flexible array members");
5263 /* ISO C99 Flexible array members are effectively
5264 identical to GCC's zero-length array extension. */
5265 if (flexible_array_member || array_parm_vla_unspec_p)
5266 itype = build_range_type (sizetype, size_zero_node,
5269 else if (decl_context == PARM)
5271 if (array_parm_vla_unspec_p)
5273 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5277 else if (decl_context == TYPENAME)
5279 if (array_parm_vla_unspec_p)
5282 warning (0, "%<[*]%> not in a declaration");
5283 /* We use this to avoid messing up with incomplete
5284 array types of the same type, that would
5285 otherwise be modified below. */
5286 itype = build_range_type (sizetype, size_zero_node,
5292 /* Complain about arrays of incomplete types. */
5293 if (!COMPLETE_TYPE_P (type))
5295 error_at (loc, "array type has incomplete element type");
5296 type = error_mark_node;
5299 /* When itype is NULL, a shared incomplete array type is
5300 returned for all array of a given type. Elsewhere we
5301 make sure we don't complete that type before copying
5302 it, but here we want to make sure we don't ever
5303 modify the shared type, so we gcc_assert (itype)
5305 type = build_array_type (type, itype);
5307 if (type != error_mark_node)
5311 /* It is ok to modify type here even if itype is
5312 NULL: if size_varies, we're in a
5313 multi-dimensional array and the inner type has
5314 variable size, so the enclosing shared array type
5316 if (size && TREE_CODE (size) == INTEGER_CST)
5318 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5319 C_TYPE_VARIABLE_SIZE (type) = 1;
5322 /* The GCC extension for zero-length arrays differs from
5323 ISO flexible array members in that sizeof yields
5325 if (size && integer_zerop (size))
5328 TYPE_SIZE (type) = bitsize_zero_node;
5329 TYPE_SIZE_UNIT (type) = size_zero_node;
5331 if (array_parm_vla_unspec_p)
5334 /* The type is complete. C99 6.7.5.2p4 */
5335 TYPE_SIZE (type) = bitsize_zero_node;
5336 TYPE_SIZE_UNIT (type) = size_zero_node;
5340 if (decl_context != PARM
5341 && (array_ptr_quals != TYPE_UNQUALIFIED
5342 || array_ptr_attrs != NULL_TREE
5343 || array_parm_static))
5345 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5346 array_ptr_quals = TYPE_UNQUALIFIED;
5347 array_ptr_attrs = NULL_TREE;
5348 array_parm_static = 0;
5354 /* Say it's a definition only for the declarator closest
5355 to the identifier, apart possibly from some
5357 bool really_funcdef = false;
5361 const struct c_declarator *t = declarator->declarator;
5362 while (t->kind == cdk_attrs)
5364 really_funcdef = (t->kind == cdk_id);
5367 /* Declaring a function type. Make sure we have a valid
5368 type for the function to return. */
5369 if (type == error_mark_node)
5372 size_varies = false;
5374 /* Warn about some types functions can't return. */
5375 if (TREE_CODE (type) == FUNCTION_TYPE)
5378 error_at (loc, "%qE declared as function returning a "
5381 error_at (loc, "type name declared as function "
5382 "returning a function");
5383 type = integer_type_node;
5385 if (TREE_CODE (type) == ARRAY_TYPE)
5388 error_at (loc, "%qE declared as function returning an array",
5391 error_at (loc, "type name declared as function returning "
5393 type = integer_type_node;
5395 errmsg = targetm.invalid_return_type (type);
5399 type = integer_type_node;
5402 /* Construct the function type and go to the next
5403 inner layer of declarator. */
5404 arg_info = declarator->u.arg_info;
5405 arg_types = grokparms (arg_info, really_funcdef);
5407 put_pending_sizes (arg_info->pending_sizes);
5409 /* Type qualifiers before the return type of the function
5410 qualify the return type, not the function type. */
5413 /* Type qualifiers on a function return type are
5414 normally permitted by the standard but have no
5415 effect, so give a warning at -Wreturn-type.
5416 Qualifiers on a void return type are banned on
5417 function definitions in ISO C; GCC used to used
5418 them for noreturn functions. */
5419 if (VOID_TYPE_P (type) && really_funcdef)
5421 "function definition has qualified void return type");
5423 warning_at (loc, OPT_Wignored_qualifiers,
5424 "type qualifiers ignored on function return type");
5426 type = c_build_qualified_type (type, type_quals);
5428 type_quals = TYPE_UNQUALIFIED;
5430 type = build_function_type (type, arg_types);
5431 declarator = declarator->declarator;
5433 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5434 the formal parameter list of this FUNCTION_TYPE to point to
5435 the FUNCTION_TYPE node itself. */
5439 for (link = arg_info->tags;
5441 link = TREE_CHAIN (link))
5442 TYPE_CONTEXT (TREE_VALUE (link)) = type;
5448 /* Merge any constancy or volatility into the target type
5451 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5453 pedwarn (loc, OPT_pedantic,
5454 "ISO C forbids qualified function types");
5456 type = c_build_qualified_type (type, type_quals);
5457 size_varies = false;
5459 /* When the pointed-to type involves components of variable size,
5460 care must be taken to ensure that the size evaluation code is
5461 emitted early enough to dominate all the possible later uses
5462 and late enough for the variables on which it depends to have
5465 This is expected to happen automatically when the pointed-to
5466 type has a name/declaration of it's own, but special attention
5467 is required if the type is anonymous.
5469 We handle the NORMAL and FIELD contexts here by attaching an
5470 artificial TYPE_DECL to such pointed-to type. This forces the
5471 sizes evaluation at a safe point and ensures it is not deferred
5472 until e.g. within a deeper conditional context.
5474 We expect nothing to be needed here for PARM or TYPENAME.
5475 Pushing a TYPE_DECL at this point for TYPENAME would actually
5476 be incorrect, as we might be in the middle of an expression
5477 with side effects on the pointed-to type size "arguments" prior
5478 to the pointer declaration point and the fake TYPE_DECL in the
5479 enclosing context would force the size evaluation prior to the
5482 if (!TYPE_NAME (type)
5483 && (decl_context == NORMAL || decl_context == FIELD)
5484 && variably_modified_type_p (type, NULL_TREE))
5486 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5487 DECL_ARTIFICIAL (decl) = 1;
5489 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5490 TYPE_NAME (type) = decl;
5493 type = build_pointer_type (type);
5495 /* Process type qualifiers (such as const or volatile)
5496 that were given inside the `*'. */
5497 type_quals = declarator->u.pointer_quals;
5499 declarator = declarator->declarator;
5506 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5508 /* Now TYPE has the actual type, apart from any qualifiers in
5511 /* Check the type and width of a bit-field. */
5513 check_bitfield_type_and_width (&type, width, name);
5515 /* Did array size calculations overflow? */
5517 if (TREE_CODE (type) == ARRAY_TYPE
5518 && COMPLETE_TYPE_P (type)
5519 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5520 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
5523 error_at (loc, "size of array %qE is too large", name);
5525 error_at (loc, "size of unnamed array is too large");
5526 /* If we proceed with the array type as it is, we'll eventually
5527 crash in tree_low_cst(). */
5528 type = error_mark_node;
5531 /* If this is declaring a typedef name, return a TYPE_DECL. */
5533 if (storage_class == csc_typedef)
5536 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5538 pedwarn (loc, OPT_pedantic,
5539 "ISO C forbids qualified function types");
5541 type = c_build_qualified_type (type, type_quals);
5542 decl = build_decl (declarator->id_loc,
5543 TYPE_DECL, declarator->u.id, type);
5544 if (declspecs->explicit_signed_p)
5545 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5546 if (declspecs->inline_p)
5547 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
5549 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
5551 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
5554 && b->decl != NULL_TREE
5555 && (B_IN_CURRENT_SCOPE (b)
5556 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
5557 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
5559 warning_at (declarator->id_loc, OPT_Wc___compat,
5560 ("using %qD as both a typedef and a tag is "
5563 if (b->locus != UNKNOWN_LOCATION)
5564 inform (b->locus, "originally defined here");
5571 /* If this is a type name (such as, in a cast or sizeof),
5572 compute the type and return it now. */
5574 if (decl_context == TYPENAME)
5576 /* Note that the grammar rejects storage classes in typenames
5578 gcc_assert (storage_class == csc_none && !threadp
5579 && !declspecs->inline_p);
5580 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5582 pedwarn (loc, OPT_pedantic,
5583 "ISO C forbids const or volatile function types");
5585 type = c_build_qualified_type (type, type_quals);
5589 if (pedantic && decl_context == FIELD
5590 && variably_modified_type_p (type, NULL_TREE))
5593 pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot "
5594 "have a variably modified type");
5597 /* Aside from typedefs and type names (handle above),
5598 `void' at top level (not within pointer)
5599 is allowed only in public variables.
5600 We don't complain about parms either, but that is because
5601 a better error message can be made later. */
5603 if (VOID_TYPE_P (type) && decl_context != PARM
5604 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5605 && (storage_class == csc_extern
5606 || (current_scope == file_scope
5607 && !(storage_class == csc_static
5608 || storage_class == csc_register)))))
5610 error_at (loc, "variable or field %qE declared void", name);
5611 type = integer_type_node;
5614 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5615 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5620 if (decl_context == PARM)
5624 /* A parameter declared as an array of T is really a pointer to T.
5625 One declared as a function is really a pointer to a function. */
5627 if (TREE_CODE (type) == ARRAY_TYPE)
5629 /* Transfer const-ness of array into that of type pointed to. */
5630 type = TREE_TYPE (type);
5632 type = c_build_qualified_type (type, type_quals);
5633 type = build_pointer_type (type);
5634 type_quals = array_ptr_quals;
5636 type = c_build_qualified_type (type, type_quals);
5638 /* We don't yet implement attributes in this context. */
5639 if (array_ptr_attrs != NULL_TREE)
5640 warning_at (loc, OPT_Wattributes,
5641 "attributes in parameter array declarator ignored");
5643 size_varies = false;
5645 else if (TREE_CODE (type) == FUNCTION_TYPE)
5648 pedwarn (loc, OPT_pedantic,
5649 "ISO C forbids qualified function types");
5651 type = c_build_qualified_type (type, type_quals);
5652 type = build_pointer_type (type);
5653 type_quals = TYPE_UNQUALIFIED;
5655 else if (type_quals)
5656 type = c_build_qualified_type (type, type_quals);
5658 decl = build_decl (declarator->id_loc,
5659 PARM_DECL, declarator->u.id, type);
5661 C_DECL_VARIABLE_SIZE (decl) = 1;
5663 /* Compute the type actually passed in the parmlist,
5664 for the case where there is no prototype.
5665 (For example, shorts and chars are passed as ints.)
5666 When there is a prototype, this is overridden later. */
5668 if (type == error_mark_node)
5669 promoted_type = type;
5671 promoted_type = c_type_promotes_to (type);
5673 DECL_ARG_TYPE (decl) = promoted_type;
5674 if (declspecs->inline_p)
5675 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
5677 else if (decl_context == FIELD)
5679 /* Note that the grammar rejects storage classes in typenames
5681 gcc_assert (storage_class == csc_none && !threadp
5682 && !declspecs->inline_p);
5684 /* Structure field. It may not be a function. */
5686 if (TREE_CODE (type) == FUNCTION_TYPE)
5688 error_at (loc, "field %qE declared as a function", name);
5689 type = build_pointer_type (type);
5691 else if (TREE_CODE (type) != ERROR_MARK
5692 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
5695 error_at (loc, "field %qE has incomplete type", name);
5697 error_at (loc, "unnamed field has incomplete type");
5698 type = error_mark_node;
5700 type = c_build_qualified_type (type, type_quals);
5701 decl = build_decl (declarator->id_loc,
5702 FIELD_DECL, declarator->u.id, type);
5703 DECL_NONADDRESSABLE_P (decl) = bitfield;
5704 if (bitfield && !declarator->u.id)
5705 TREE_NO_WARNING (decl) = 1;
5708 C_DECL_VARIABLE_SIZE (decl) = 1;
5710 else if (TREE_CODE (type) == FUNCTION_TYPE)
5712 if (storage_class == csc_register || threadp)
5714 error_at (loc, "invalid storage class for function %qE", name);
5716 else if (current_scope != file_scope)
5718 /* Function declaration not at file scope. Storage
5719 classes other than `extern' are not allowed, C99
5720 6.7.1p5, and `extern' makes no difference. However,
5721 GCC allows 'auto', perhaps with 'inline', to support
5722 nested functions. */
5723 if (storage_class == csc_auto)
5724 pedwarn (loc, OPT_pedantic,
5725 "invalid storage class for function %qE", name);
5726 else if (storage_class == csc_static)
5728 error_at (loc, "invalid storage class for function %qE", name);
5730 storage_class = declspecs->storage_class = csc_none;
5736 decl = build_decl (declarator->id_loc,
5737 FUNCTION_DECL, declarator->u.id, type);
5738 decl = build_decl_attribute_variant (decl, decl_attr);
5740 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
5741 pedwarn (loc, OPT_pedantic,
5742 "ISO C forbids qualified function types");
5744 /* GNU C interprets a volatile-qualified function type to indicate
5745 that the function does not return. */
5746 if ((type_quals & TYPE_QUAL_VOLATILE)
5747 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
5748 warning_at (loc, 0, "%<noreturn%> function returns non-void value");
5750 /* Every function declaration is an external reference
5751 (DECL_EXTERNAL) except for those which are not at file
5752 scope and are explicitly declared "auto". This is
5753 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5754 GCC to signify a forward declaration of a nested function. */
5755 if (storage_class == csc_auto && current_scope != file_scope)
5756 DECL_EXTERNAL (decl) = 0;
5757 /* In C99, a function which is declared 'inline' with 'extern'
5758 is not an external reference (which is confusing). It
5759 means that the later definition of the function must be output
5760 in this file, C99 6.7.4p6. In GNU C89, a function declared
5761 'extern inline' is an external reference. */
5762 else if (declspecs->inline_p && storage_class != csc_static)
5763 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
5764 == flag_gnu89_inline);
5766 DECL_EXTERNAL (decl) = !initialized;
5768 /* Record absence of global scope for `static' or `auto'. */
5770 = !(storage_class == csc_static || storage_class == csc_auto);
5772 /* For a function definition, record the argument information
5773 block where store_parm_decls will look for it. */
5775 current_function_arg_info = arg_info;
5777 if (declspecs->default_int_p)
5778 C_FUNCTION_IMPLICIT_INT (decl) = 1;
5780 /* Record presence of `inline', if it is reasonable. */
5781 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
5783 if (declspecs->inline_p)
5784 pedwarn (loc, 0, "cannot inline function %<main%>");
5786 else if (declspecs->inline_p)
5787 /* Record that the function is declared `inline'. */
5788 DECL_DECLARED_INLINE_P (decl) = 1;
5792 /* It's a variable. */
5793 /* An uninitialized decl with `extern' is a reference. */
5794 int extern_ref = !initialized && storage_class == csc_extern;
5796 type = c_build_qualified_type (type, type_quals);
5798 /* C99 6.2.2p7: It is invalid (compile-time undefined
5799 behavior) to create an 'extern' declaration for a
5800 variable if there is a global declaration that is
5801 'static' and the global declaration is not visible.
5802 (If the static declaration _is_ currently visible,
5803 the 'extern' declaration is taken to refer to that decl.) */
5804 if (extern_ref && current_scope != file_scope)
5806 tree global_decl = identifier_global_value (declarator->u.id);
5807 tree visible_decl = lookup_name (declarator->u.id);
5810 && global_decl != visible_decl
5811 && TREE_CODE (global_decl) == VAR_DECL
5812 && !TREE_PUBLIC (global_decl))
5813 error_at (loc, "variable previously declared %<static%> "
5814 "redeclared %<extern%>");
5817 decl = build_decl (declarator->id_loc,
5818 VAR_DECL, declarator->u.id, type);
5820 C_DECL_VARIABLE_SIZE (decl) = 1;
5822 if (declspecs->inline_p)
5823 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
5825 /* At file scope, an initialized extern declaration may follow
5826 a static declaration. In that case, DECL_EXTERNAL will be
5827 reset later in start_decl. */
5828 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
5830 /* At file scope, the presence of a `static' or `register' storage
5831 class specifier, or the absence of all storage class specifiers
5832 makes this declaration a definition (perhaps tentative). Also,
5833 the absence of `static' makes it public. */
5834 if (current_scope == file_scope)
5836 TREE_PUBLIC (decl) = storage_class != csc_static;
5837 TREE_STATIC (decl) = !extern_ref;
5839 /* Not at file scope, only `static' makes a static definition. */
5842 TREE_STATIC (decl) = (storage_class == csc_static);
5843 TREE_PUBLIC (decl) = extern_ref;
5847 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
5850 if ((storage_class == csc_extern
5851 || (storage_class == csc_none
5852 && TREE_CODE (type) == FUNCTION_TYPE
5854 && variably_modified_type_p (type, NULL_TREE))
5857 if (TREE_CODE (type) == FUNCTION_TYPE)
5858 error_at (loc, "non-nested function with variably modified type");
5860 error_at (loc, "object with variably modified type must have "
5864 /* Record `register' declaration for warnings on &
5865 and in case doing stupid register allocation. */
5867 if (storage_class == csc_register)
5869 C_DECL_REGISTER (decl) = 1;
5870 DECL_REGISTER (decl) = 1;
5873 /* Record constancy and volatility. */
5874 c_apply_type_quals_to_decl (type_quals, decl);
5876 /* If a type has volatile components, it should be stored in memory.
5877 Otherwise, the fact that those components are volatile
5878 will be ignored, and would even crash the compiler.
5879 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
5880 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
5881 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
5882 || TREE_CODE (decl) == RESULT_DECL))
5884 /* It is not an error for a structure with volatile fields to
5885 be declared register, but reset DECL_REGISTER since it
5886 cannot actually go in a register. */
5887 int was_reg = C_DECL_REGISTER (decl);
5888 C_DECL_REGISTER (decl) = 0;
5889 DECL_REGISTER (decl) = 0;
5890 c_mark_addressable (decl);
5891 C_DECL_REGISTER (decl) = was_reg;
5894 /* This is the earliest point at which we might know the assembler
5895 name of a variable. Thus, if it's known before this, die horribly. */
5896 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
5899 && TREE_CODE (decl) == VAR_DECL
5900 && TREE_PUBLIC (decl)
5901 && TREE_STATIC (decl)
5902 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
5903 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
5904 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
5905 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
5906 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
5907 ("non-local variable %qD with anonymous type is "
5908 "questionable in C++"),
5915 /* Decode the parameter-list info for a function type or function definition.
5916 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5917 if there is an identifier list instead of a parameter decl list).
5918 These two functions are separate because when a function returns
5919 or receives functions then each is called multiple times but the order
5920 of calls is different. The last call to `grokparms' is always the one
5921 that contains the formal parameter names of a function definition.
5923 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5925 FUNCDEF_FLAG is true for a function definition, false for
5926 a mere declaration. A nonempty identifier-list gets an error message
5927 when FUNCDEF_FLAG is false. */
5930 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5932 tree arg_types = arg_info->types;
5934 if (funcdef_flag && arg_info->had_vla_unspec)
5936 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5938 error ("%<[*]%> not allowed in other than function prototype scope");
5941 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5942 warning (OPT_Wstrict_prototypes,
5943 "function declaration isn%'t a prototype");
5945 if (arg_types == error_mark_node)
5946 return 0; /* don't set TYPE_ARG_TYPES in this case */
5948 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5951 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
5953 arg_info->parms = arg_info->types;
5954 arg_info->types = 0;
5959 tree parm, type, typelt;
5960 unsigned int parmno;
5963 /* If there is a parameter of incomplete type in a definition,
5964 this is an error. In a declaration this is valid, and a
5965 struct or union type may be completed later, before any calls
5966 or definition of the function. In the case where the tag was
5967 first declared within the parameter list, a warning has
5968 already been given. If a parameter has void type, then
5969 however the function cannot be defined or called, so
5972 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5974 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5976 type = TREE_VALUE (typelt);
5977 if (type == error_mark_node)
5980 if (!COMPLETE_TYPE_P (type))
5984 if (DECL_NAME (parm))
5985 error_at (input_location,
5986 "parameter %u (%q+D) has incomplete type",
5989 error_at (DECL_SOURCE_LOCATION (parm),
5990 "parameter %u has incomplete type",
5993 TREE_VALUE (typelt) = error_mark_node;
5994 TREE_TYPE (parm) = error_mark_node;
5996 else if (VOID_TYPE_P (type))
5998 if (DECL_NAME (parm))
5999 warning_at (input_location, 0,
6000 "parameter %u (%q+D) has void type",
6003 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6004 "parameter %u has void type",
6009 errmsg = targetm.invalid_parameter_type (type);
6013 TREE_VALUE (typelt) = error_mark_node;
6014 TREE_TYPE (parm) = error_mark_node;
6017 if (DECL_NAME (parm) && TREE_USED (parm))
6018 warn_if_shadowing (parm);
6024 /* Take apart the current scope and return a c_arg_info structure with
6025 info on a parameter list just parsed.
6027 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6029 ELLIPSIS being true means the argument list ended in '...' so don't
6030 append a sentinel (void_list_node) to the end of the type-list. */
6033 get_parm_info (bool ellipsis)
6035 struct c_binding *b = current_scope->bindings;
6036 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
6043 static bool explained_incomplete_types = false;
6044 bool gave_void_only_once_err = false;
6046 arg_info->parms = 0;
6048 arg_info->types = 0;
6049 arg_info->others = 0;
6050 arg_info->pending_sizes = 0;
6051 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6053 /* The bindings in this scope must not get put into a block.
6054 We will take care of deleting the binding nodes. */
6055 current_scope->bindings = 0;
6057 /* This function is only called if there was *something* on the
6061 /* A parameter list consisting solely of 'void' indicates that the
6062 function takes no arguments. But if the 'void' is qualified
6063 (by 'const' or 'volatile'), or has a storage class specifier
6064 ('register'), then the behavior is undefined; issue an error.
6065 Typedefs for 'void' are OK (see DR#157). */
6066 if (b->prev == 0 /* one binding */
6067 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6068 && !DECL_NAME (b->decl) /* anonymous */
6069 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6071 if (TREE_THIS_VOLATILE (b->decl)
6072 || TREE_READONLY (b->decl)
6073 || C_DECL_REGISTER (b->decl))
6074 error ("%<void%> as only parameter may not be qualified");
6076 /* There cannot be an ellipsis. */
6078 error ("%<void%> must be the only parameter");
6080 arg_info->types = void_list_node;
6085 types = void_list_node;
6087 /* Break up the bindings list into parms, tags, types, and others;
6088 apply sanity checks; purge the name-to-decl bindings. */
6091 tree decl = b->decl;
6092 tree type = TREE_TYPE (decl);
6093 const char *keyword;
6095 switch (TREE_CODE (decl))
6100 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6101 I_SYMBOL_BINDING (b->id) = b->shadowed;
6104 /* Check for forward decls that never got their actual decl. */
6105 if (TREE_ASM_WRITTEN (decl))
6106 error ("parameter %q+D has just a forward declaration", decl);
6107 /* Check for (..., void, ...) and issue an error. */
6108 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6110 if (!gave_void_only_once_err)
6112 error ("%<void%> must be the only parameter");
6113 gave_void_only_once_err = true;
6118 /* Valid parameter, add it to the list. */
6119 TREE_CHAIN (decl) = parms;
6122 /* Since there is a prototype, args are passed in their
6123 declared types. The back end may override this later. */
6124 DECL_ARG_TYPE (decl) = type;
6125 types = tree_cons (0, type, types);
6129 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6130 case UNION_TYPE: keyword = "union"; goto tag;
6131 case RECORD_TYPE: keyword = "struct"; goto tag;
6133 /* Types may not have tag-names, in which case the type
6134 appears in the bindings list with b->id NULL. */
6137 gcc_assert (I_TAG_BINDING (b->id) == b);
6138 I_TAG_BINDING (b->id) = b->shadowed;
6141 /* Warn about any struct, union or enum tags defined in a
6142 parameter list. The scope of such types is limited to
6143 the parameter list, which is rarely if ever desirable
6144 (it's impossible to call such a function with type-
6145 correct arguments). An anonymous union parm type is
6146 meaningful as a GNU extension, so don't warn for that. */
6147 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6150 /* The %s will be one of 'struct', 'union', or 'enum'. */
6151 warning (0, "%<%s %E%> declared inside parameter list",
6154 /* The %s will be one of 'struct', 'union', or 'enum'. */
6155 warning (0, "anonymous %s declared inside parameter list",
6158 if (!explained_incomplete_types)
6160 warning (0, "its scope is only this definition or declaration,"
6161 " which is probably not what you want");
6162 explained_incomplete_types = true;
6166 tags = tree_cons (b->id, decl, tags);
6172 /* CONST_DECLs appear here when we have an embedded enum,
6173 and TYPE_DECLs appear here when we have an embedded struct
6174 or union. No warnings for this - we already warned about the
6175 type itself. FUNCTION_DECLs appear when there is an implicit
6176 function declaration in the parameter list. */
6178 TREE_CHAIN (decl) = others;
6183 /* error_mark_node appears here when we have an undeclared
6184 variable. Just throw it away. */
6187 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6188 I_SYMBOL_BINDING (b->id) = b->shadowed;
6192 /* Other things that might be encountered. */
6199 b = free_binding_and_advance (b);
6202 arg_info->parms = parms;
6203 arg_info->tags = tags;
6204 arg_info->types = types;
6205 arg_info->others = others;
6206 arg_info->pending_sizes = get_pending_sizes ();
6210 /* Get the struct, enum or union (CODE says which) with tag NAME.
6211 Define the tag as a forward-reference with location LOC if it is
6212 not defined. Return a c_typespec structure for the type
6216 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6218 struct c_typespec ret;
6222 ret.expr = NULL_TREE;
6223 ret.expr_const_operands = true;
6225 /* If a cross reference is requested, look up the type
6226 already defined for this tag and return it. */
6228 ref = lookup_tag (code, name, 0, &refloc);
6229 /* If this is the right type of tag, return what we found.
6230 (This reference will be shadowed by shadow_tag later if appropriate.)
6231 If this is the wrong type of tag, do not return it. If it was the
6232 wrong type in the same scope, we will have had an error
6233 message already; if in a different scope and declaring
6234 a name, pending_xref_error will give an error message; but if in a
6235 different scope and not declaring a name, this tag should
6236 shadow the previous declaration of a different type of tag, and
6237 this would not work properly if we return the reference found.
6238 (For example, with "struct foo" in an outer scope, "union foo;"
6239 must shadow that tag with a new one of union type.) */
6240 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6241 if (ref && TREE_CODE (ref) == code)
6243 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6244 && loc != UNKNOWN_LOCATION
6250 warning_at (loc, OPT_Wc___compat,
6251 ("enum type defined in struct or union "
6252 "is not visible in C++"));
6253 inform (refloc, "enum type defined here");
6256 warning_at (loc, OPT_Wc___compat,
6257 ("struct defined in struct or union "
6258 "is not visible in C++"));
6259 inform (refloc, "struct defined here");
6262 warning_at (loc, OPT_Wc___compat,
6263 ("union defined in struct or union "
6264 "is not visible in C++"));
6265 inform (refloc, "union defined here");
6276 /* If no such tag is yet defined, create a forward-reference node
6277 and record it as the "definition".
6278 When a real declaration of this type is found,
6279 the forward-reference will be altered into a real type. */
6281 ref = make_node (code);
6282 if (code == ENUMERAL_TYPE)
6284 /* Give the type a default layout like unsigned int
6285 to avoid crashing if it does not get defined. */
6286 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6287 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6288 TYPE_USER_ALIGN (ref) = 0;
6289 TYPE_UNSIGNED (ref) = 1;
6290 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6291 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6292 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6295 pushtag (loc, name, ref);
6301 /* Get the struct, enum or union (CODE says which) with tag NAME.
6302 Define the tag as a forward-reference if it is not defined.
6303 Return a tree for the type. */
6306 xref_tag (enum tree_code code, tree name)
6308 return parser_xref_tag (input_location, code, name).spec;
6311 /* Make sure that the tag NAME is defined *in the current scope*
6312 at least as a forward reference.
6313 LOC is the location of the struct's definition.
6314 CODE says which kind of tag NAME ought to be.
6316 This stores the current value of the file static STRUCT_PARSE_INFO
6317 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6318 new c_struct_parse_info structure. The old value of
6319 STRUCT_PARSE_INFO is restored in finish_struct. */
6322 start_struct (location_t loc, enum tree_code code, tree name,
6323 struct c_struct_parse_info **enclosing_struct_parse_info)
6325 /* If there is already a tag defined at this scope
6326 (as a forward reference), just return it. */
6328 tree ref = NULL_TREE;
6329 location_t refloc = UNKNOWN_LOCATION;
6331 if (name != NULL_TREE)
6332 ref = lookup_tag (code, name, 1, &refloc);
6333 if (ref && TREE_CODE (ref) == code)
6335 if (TYPE_SIZE (ref))
6337 if (code == UNION_TYPE)
6338 error_at (loc, "redefinition of %<union %E%>", name);
6340 error_at (loc, "redefinition of %<struct %E%>", name);
6341 if (refloc != UNKNOWN_LOCATION)
6342 inform (refloc, "originally defined here");
6343 /* Don't create structures using a name already in use. */
6346 else if (C_TYPE_BEING_DEFINED (ref))
6348 if (code == UNION_TYPE)
6349 error_at (loc, "nested redefinition of %<union %E%>", name);
6351 error_at (loc, "nested redefinition of %<struct %E%>", name);
6352 /* Don't bother to report "originally defined here" for a
6353 nested redefinition; the original definition should be
6355 /* Don't create structures that contain themselves. */
6360 /* Otherwise create a forward-reference just so the tag is in scope. */
6362 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6364 ref = make_node (code);
6365 pushtag (loc, name, ref);
6368 C_TYPE_BEING_DEFINED (ref) = 1;
6369 TYPE_PACKED (ref) = flag_pack_struct;
6371 *enclosing_struct_parse_info = struct_parse_info;
6372 struct_parse_info = XNEW (struct c_struct_parse_info);
6373 struct_parse_info->struct_types = VEC_alloc (tree, heap, 0);
6374 struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0);
6375 struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0);
6377 /* FIXME: This will issue a warning for a use of a type defined
6378 within a statement expr used within sizeof, et. al. This is not
6379 terribly serious as C++ doesn't permit statement exprs within
6381 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6382 warning_at (loc, OPT_Wc___compat,
6383 "defining type in %qs expression is invalid in C++",
6386 : (in_typeof ? "typeof" : "alignof")));
6391 /* Process the specs, declarator and width (NULL if omitted)
6392 of a structure component, returning a FIELD_DECL node.
6393 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6394 DECL_ATTRS is as for grokdeclarator.
6396 LOC is the location of the structure component.
6398 This is done during the parsing of the struct declaration.
6399 The FIELD_DECL nodes are chained together and the lot of them
6400 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6403 grokfield (location_t loc,
6404 struct c_declarator *declarator, struct c_declspecs *declspecs,
6405 tree width, tree *decl_attrs)
6409 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6410 && width == NULL_TREE)
6412 /* This is an unnamed decl.
6414 If we have something of the form "union { list } ;" then this
6415 is the anonymous union extension. Similarly for struct.
6417 If this is something of the form "struct foo;", then
6418 If MS extensions are enabled, this is handled as an
6420 Otherwise this is a forward declaration of a structure tag.
6422 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6423 If MS extensions are enabled and foo names a structure, then
6424 again this is an anonymous struct.
6425 Otherwise this is an error.
6427 Oh what a horrid tangled web we weave. I wonder if MS consciously
6428 took this from Plan 9 or if it was an accident of implementation
6429 that took root before someone noticed the bug... */
6431 tree type = declspecs->type;
6432 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6433 || TREE_CODE (type) == UNION_TYPE);
6437 && (flag_ms_extensions || !declspecs->typedef_p))
6439 if (flag_ms_extensions)
6443 else if (TYPE_NAME (type) == NULL)
6450 pedwarn (loc, 0, "declaration does not declare anything");
6453 pedwarn (loc, OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions");
6456 value = grokdeclarator (declarator, declspecs, FIELD, false,
6457 width ? &width : NULL, decl_attrs, NULL, NULL,
6460 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6461 DECL_INITIAL (value) = width;
6463 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
6465 /* If we currently have a binding for this field, set the
6466 in_struct field in the binding, so that we warn about lookups
6468 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
6471 /* If the in_struct field is not yet set, push it on a list
6472 to be cleared when this struct is finished. */
6475 VEC_safe_push (c_binding_ptr, heap,
6476 struct_parse_info->fields, b);
6485 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6486 the list such that this does not present a problem later. */
6489 detect_field_duplicates (tree fieldlist)
6494 /* First, see if there are more than "a few" fields.
6495 This is trivially true if there are zero or one fields. */
6498 x = TREE_CHAIN (fieldlist);
6504 } while (timeout > 0 && x);
6506 /* If there were "few" fields, avoid the overhead of allocating
6507 a hash table. Instead just do the nested traversal thing. */
6510 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
6513 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
6514 if (DECL_NAME (y) == DECL_NAME (x))
6516 error ("duplicate member %q+D", x);
6517 DECL_NAME (x) = NULL_TREE;
6523 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
6526 for (x = fieldlist; x ; x = TREE_CHAIN (x))
6527 if ((y = DECL_NAME (x)) != 0)
6529 slot = htab_find_slot (htab, y, INSERT);
6532 error ("duplicate member %q+D", x);
6533 DECL_NAME (x) = NULL_TREE;
6542 /* Finish up struct info used by -Wc++-compat. */
6545 warn_cxx_compat_finish_struct (tree fieldlist)
6549 struct c_binding *b;
6551 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6552 the current struct. We do this now at the end of the struct
6553 because the flag is used to issue visibility warnings, and we
6554 only want to issue those warnings if the type is referenced
6555 outside of the struct declaration. */
6556 for (ix = 0; VEC_iterate (tree, struct_parse_info->struct_types, ix, x); ++ix)
6557 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
6559 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6560 typedefs used when declaring fields in this struct. If the name
6561 of any of the fields is also a typedef name then the struct would
6562 not parse in C++, because the C++ lookup rules say that the
6563 typedef name would be looked up in the context of the struct, and
6564 would thus be the field rather than the typedef. */
6565 if (!VEC_empty (tree, struct_parse_info->typedefs_seen)
6566 && fieldlist != NULL_TREE)
6568 /* Use a pointer_set using the name of the typedef. We can use
6569 a pointer_set because identifiers are interned. */
6570 struct pointer_set_t *tset = pointer_set_create ();
6573 VEC_iterate (tree, struct_parse_info->typedefs_seen, ix, x);
6575 pointer_set_insert (tset, DECL_NAME (x));
6577 for (x = fieldlist; x != NULL_TREE; x = TREE_CHAIN (x))
6579 if (pointer_set_contains (tset, DECL_NAME (x)))
6581 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
6582 ("using %qD as both field and typedef name is "
6585 /* FIXME: It would be nice to report the location where
6586 the typedef name is used. */
6590 pointer_set_destroy (tset);
6593 /* For each field which has a binding and which was not defined in
6594 an enclosing struct, clear the in_struct field. */
6596 VEC_iterate (c_binding_ptr, struct_parse_info->fields, ix, b);
6601 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6602 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6603 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6604 ATTRIBUTES are attributes to be applied to the structure.
6606 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6607 the struct was started. */
6610 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
6611 struct c_struct_parse_info *enclosing_struct_parse_info)
6614 bool toplevel = file_scope == current_scope;
6615 int saw_named_field;
6617 /* If this type was previously laid out as a forward reference,
6618 make sure we lay it out again. */
6622 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6626 for (x = fieldlist; x; x = TREE_CHAIN (x))
6627 if (DECL_NAME (x) != 0)
6632 if (TREE_CODE (t) == UNION_TYPE)
6635 pedwarn (loc, OPT_pedantic, "union has no named members");
6637 pedwarn (loc, OPT_pedantic, "union has no members");
6642 pedwarn (loc, OPT_pedantic, "struct has no named members");
6644 pedwarn (loc, OPT_pedantic, "struct has no members");
6649 /* Install struct as DECL_CONTEXT of each field decl.
6650 Also process specified field sizes, found in the DECL_INITIAL,
6651 storing 0 there after the type has been changed to precision equal
6652 to its width, rather than the precision of the specified standard
6653 type. (Correct layout requires the original type to have been preserved
6656 saw_named_field = 0;
6657 for (x = fieldlist; x; x = TREE_CHAIN (x))
6659 if (TREE_TYPE (x) == error_mark_node)
6662 DECL_CONTEXT (x) = t;
6664 /* If any field is const, the structure type is pseudo-const. */
6665 if (TREE_READONLY (x))
6666 C_TYPE_FIELDS_READONLY (t) = 1;
6669 /* A field that is pseudo-const makes the structure likewise. */
6670 tree t1 = TREE_TYPE (x);
6671 while (TREE_CODE (t1) == ARRAY_TYPE)
6672 t1 = TREE_TYPE (t1);
6673 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
6674 && C_TYPE_FIELDS_READONLY (t1))
6675 C_TYPE_FIELDS_READONLY (t) = 1;
6678 /* Any field that is volatile means variables of this type must be
6679 treated in some ways as volatile. */
6680 if (TREE_THIS_VOLATILE (x))
6681 C_TYPE_FIELDS_VOLATILE (t) = 1;
6683 /* Any field of nominal variable size implies structure is too. */
6684 if (C_DECL_VARIABLE_SIZE (x))
6685 C_TYPE_VARIABLE_SIZE (t) = 1;
6687 if (DECL_INITIAL (x))
6689 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
6690 DECL_SIZE (x) = bitsize_int (width);
6691 DECL_BIT_FIELD (x) = 1;
6692 SET_DECL_C_BIT_FIELD (x);
6696 && (DECL_BIT_FIELD (x)
6697 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
6698 DECL_PACKED (x) = 1;
6700 /* Detect flexible array member in an invalid context. */
6701 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
6702 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
6703 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
6704 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
6706 if (TREE_CODE (t) == UNION_TYPE)
6708 error_at (DECL_SOURCE_LOCATION (x),
6709 "flexible array member in union");
6710 TREE_TYPE (x) = error_mark_node;
6712 else if (TREE_CHAIN (x) != NULL_TREE)
6714 error_at (DECL_SOURCE_LOCATION (x),
6715 "flexible array member not at end of struct");
6716 TREE_TYPE (x) = error_mark_node;
6718 else if (!saw_named_field)
6720 error_at (DECL_SOURCE_LOCATION (x),
6721 "flexible array member in otherwise empty struct");
6722 TREE_TYPE (x) = error_mark_node;
6726 if (pedantic && TREE_CODE (t) == RECORD_TYPE
6727 && flexible_array_type_p (TREE_TYPE (x)))
6728 pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic,
6729 "invalid use of structure with flexible array member");
6732 saw_named_field = 1;
6735 detect_field_duplicates (fieldlist);
6737 /* Now we have the nearly final fieldlist. Record it,
6738 then lay out the structure or union (including the fields). */
6740 TYPE_FIELDS (t) = fieldlist;
6744 /* Give bit-fields their proper types. */
6746 tree *fieldlistp = &fieldlist;
6748 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
6749 && TREE_TYPE (*fieldlistp) != error_mark_node)
6751 unsigned HOST_WIDE_INT width
6752 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
6753 tree type = TREE_TYPE (*fieldlistp);
6754 if (width != TYPE_PRECISION (type))
6756 TREE_TYPE (*fieldlistp)
6757 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
6758 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
6760 DECL_INITIAL (*fieldlistp) = 0;
6763 fieldlistp = &TREE_CHAIN (*fieldlistp);
6766 /* Now we have the truly final field list.
6767 Store it in this type and in the variants. */
6769 TYPE_FIELDS (t) = fieldlist;
6771 /* If there are lots of fields, sort so we can look through them fast.
6772 We arbitrarily consider 16 or more elts to be "a lot". */
6777 for (x = fieldlist; x; x = TREE_CHAIN (x))
6779 if (len > 15 || DECL_NAME (x) == NULL)
6787 struct lang_type *space;
6788 struct sorted_fields_type *space2;
6790 len += list_length (x);
6792 /* Use the same allocation policy here that make_node uses, to
6793 ensure that this lives as long as the rest of the struct decl.
6794 All decls in an inline function need to be saved. */
6796 space = GGC_CNEW (struct lang_type);
6797 space2 = GGC_NEWVAR (struct sorted_fields_type,
6798 sizeof (struct sorted_fields_type) + len * sizeof (tree));
6802 field_array = &space2->elts[0];
6803 for (x = fieldlist; x; x = TREE_CHAIN (x))
6805 field_array[len++] = x;
6807 /* If there is anonymous struct or union, break out of the loop. */
6808 if (DECL_NAME (x) == NULL)
6811 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
6814 TYPE_LANG_SPECIFIC (t) = space;
6815 TYPE_LANG_SPECIFIC (t)->s->len = len;
6816 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
6817 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6822 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6824 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6825 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6826 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
6827 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
6828 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
6831 /* If this was supposed to be a transparent union, but we can't
6832 make it one, warn and turn off the flag. */
6833 if (TREE_CODE (t) == UNION_TYPE
6834 && TYPE_TRANSPARENT_UNION (t)
6835 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
6837 TYPE_TRANSPARENT_UNION (t) = 0;
6838 warning_at (loc, 0, "union cannot be made transparent");
6841 /* If this structure or union completes the type of any previous
6842 variable declaration, lay it out and output its rtl. */
6843 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
6847 tree decl = TREE_VALUE (x);
6848 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6849 layout_array_type (TREE_TYPE (decl));
6850 if (TREE_CODE (decl) != TYPE_DECL)
6852 layout_decl (decl, 0);
6853 if (c_dialect_objc ())
6854 objc_check_decl (decl);
6855 rest_of_decl_compilation (decl, toplevel, 0);
6860 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
6862 /* Update type location to the one of the definition, instead of e.g.
6863 a forward declaration. */
6864 if (TYPE_STUB_DECL (t))
6865 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
6867 /* Finish debugging output for this type. */
6868 rest_of_type_compilation (t, toplevel);
6870 /* If we're inside a function proper, i.e. not file-scope and not still
6871 parsing parameters, then arrange for the size of a variable sized type
6873 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
6874 add_stmt (build_stmt (loc,
6875 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
6877 if (warn_cxx_compat)
6878 warn_cxx_compat_finish_struct (fieldlist);
6880 VEC_free (tree, heap, struct_parse_info->struct_types);
6881 VEC_free (c_binding_ptr, heap, struct_parse_info->fields);
6882 VEC_free (tree, heap, struct_parse_info->typedefs_seen);
6883 XDELETE (struct_parse_info);
6885 struct_parse_info = enclosing_struct_parse_info;
6887 /* If this struct is defined inside a struct, add it to
6890 && struct_parse_info != NULL
6891 && !in_sizeof && !in_typeof && !in_alignof)
6892 VEC_safe_push (tree, heap, struct_parse_info->struct_types, t);
6897 /* Lay out the type T, and its element type, and so on. */
6900 layout_array_type (tree t)
6902 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6903 layout_array_type (TREE_TYPE (t));
6907 /* Begin compiling the definition of an enumeration type.
6908 NAME is its name (or null if anonymous).
6909 LOC is the enum's location.
6910 Returns the type object, as yet incomplete.
6911 Also records info about it so that build_enumerator
6912 may be used to declare the individual values as they are read. */
6915 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
6917 tree enumtype = NULL_TREE;
6918 location_t enumloc = UNKNOWN_LOCATION;
6920 /* If this is the real definition for a previous forward reference,
6921 fill in the contents in the same object that used to be the
6922 forward reference. */
6924 if (name != NULL_TREE)
6925 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
6927 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6929 enumtype = make_node (ENUMERAL_TYPE);
6930 pushtag (loc, name, enumtype);
6933 if (C_TYPE_BEING_DEFINED (enumtype))
6934 error_at (loc, "nested redefinition of %<enum %E%>", name);
6936 C_TYPE_BEING_DEFINED (enumtype) = 1;
6938 if (TYPE_VALUES (enumtype) != 0)
6940 /* This enum is a named one that has been declared already. */
6941 error_at (loc, "redeclaration of %<enum %E%>", name);
6942 if (enumloc != UNKNOWN_LOCATION)
6943 inform (enumloc, "originally defined here");
6945 /* Completely replace its old definition.
6946 The old enumerators remain defined, however. */
6947 TYPE_VALUES (enumtype) = 0;
6950 the_enum->enum_next_value = integer_zero_node;
6951 the_enum->enum_overflow = 0;
6953 if (flag_short_enums)
6954 TYPE_PACKED (enumtype) = 1;
6956 /* FIXME: This will issue a warning for a use of a type defined
6957 within sizeof in a statement expr. This is not terribly serious
6958 as C++ doesn't permit statement exprs within sizeof anyhow. */
6959 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6960 warning_at (loc, OPT_Wc___compat,
6961 "defining type in %qs expression is invalid in C++",
6964 : (in_typeof ? "typeof" : "alignof")));
6969 /* After processing and defining all the values of an enumeration type,
6970 install their decls in the enumeration type and finish it off.
6971 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6972 and ATTRIBUTES are the specified attributes.
6973 Returns ENUMTYPE. */
6976 finish_enum (tree enumtype, tree values, tree attributes)
6979 tree minnode = 0, maxnode = 0;
6980 int precision, unsign;
6981 bool toplevel = (file_scope == current_scope);
6982 struct lang_type *lt;
6984 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6986 /* Calculate the maximum value of any enumerator in this type. */
6988 if (values == error_mark_node)
6989 minnode = maxnode = integer_zero_node;
6992 minnode = maxnode = TREE_VALUE (values);
6993 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
6995 tree value = TREE_VALUE (pair);
6996 if (tree_int_cst_lt (maxnode, value))
6998 if (tree_int_cst_lt (value, minnode))
7003 /* Construct the final type of this enumeration. It is the same
7004 as one of the integral types - the narrowest one that fits, except
7005 that normally we only go as narrow as int - and signed iff any of
7006 the values are negative. */
7007 unsign = (tree_int_cst_sgn (minnode) >= 0);
7008 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
7009 tree_int_cst_min_precision (maxnode, unsign));
7011 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7013 tem = c_common_type_for_size (precision, unsign);
7016 warning (0, "enumeration values exceed range of largest integer");
7017 tem = long_long_integer_type_node;
7021 tem = unsign ? unsigned_type_node : integer_type_node;
7023 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7024 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7025 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7026 TYPE_SIZE (enumtype) = 0;
7028 /* If the precision of the type was specific with an attribute and it
7029 was too small, give an error. Otherwise, use it. */
7030 if (TYPE_PRECISION (enumtype))
7032 if (precision > TYPE_PRECISION (enumtype))
7033 error ("specified mode too small for enumeral values");
7036 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7038 layout_type (enumtype);
7040 if (values != error_mark_node)
7042 /* Change the type of the enumerators to be the enum type. We
7043 need to do this irrespective of the size of the enum, for
7044 proper type checking. Replace the DECL_INITIALs of the
7045 enumerators, and the value slots of the list, with copies
7046 that have the enum type; they cannot be modified in place
7047 because they may be shared (e.g. integer_zero_node) Finally,
7048 change the purpose slots to point to the names of the decls. */
7049 for (pair = values; pair; pair = TREE_CHAIN (pair))
7051 tree enu = TREE_PURPOSE (pair);
7052 tree ini = DECL_INITIAL (enu);
7054 TREE_TYPE (enu) = enumtype;
7056 /* The ISO C Standard mandates enumerators to have type int,
7057 even though the underlying type of an enum type is
7058 unspecified. However, GCC allows enumerators of any
7059 integer type as an extensions. build_enumerator()
7060 converts any enumerators that fit in an int to type int,
7061 to avoid promotions to unsigned types when comparing
7062 integers with enumerators that fit in the int range.
7063 When -pedantic is given, build_enumerator() would have
7064 already warned about those that don't fit. Here we
7065 convert the rest to the enumerator type. */
7066 if (TREE_TYPE (ini) != integer_type_node)
7067 ini = convert (enumtype, ini);
7069 DECL_INITIAL (enu) = ini;
7070 TREE_PURPOSE (pair) = DECL_NAME (enu);
7071 TREE_VALUE (pair) = ini;
7074 TYPE_VALUES (enumtype) = values;
7077 /* Record the min/max values so that we can warn about bit-field
7078 enumerations that are too small for the values. */
7079 lt = GGC_CNEW (struct lang_type);
7080 lt->enum_min = minnode;
7081 lt->enum_max = maxnode;
7082 TYPE_LANG_SPECIFIC (enumtype) = lt;
7084 /* Fix up all variant types of this enum type. */
7085 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7087 if (tem == enumtype)
7089 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7090 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7091 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7092 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7093 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7094 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7095 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7096 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7097 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7098 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7099 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7102 /* Finish debugging output for this type. */
7103 rest_of_type_compilation (enumtype, toplevel);
7105 /* If this enum is defined inside a struct, add it to
7108 && struct_parse_info != NULL
7109 && !in_sizeof && !in_typeof && !in_alignof)
7110 VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype);
7115 /* Build and install a CONST_DECL for one value of the
7116 current enumeration type (one that was begun with start_enum).
7117 LOC is the location of the enumerator.
7118 Return a tree-list containing the CONST_DECL and its value.
7119 Assignment of sequential values by default is handled here. */
7122 build_enumerator (location_t loc,
7123 struct c_enum_contents *the_enum, tree name, tree value)
7127 /* Validate and default VALUE. */
7131 /* Don't issue more errors for error_mark_node (i.e. an
7132 undeclared identifier) - just ignore the value expression. */
7133 if (value == error_mark_node)
7135 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7137 error_at (loc, "enumerator value for %qE is not an integer constant",
7143 if (TREE_CODE (value) != INTEGER_CST)
7145 value = c_fully_fold (value, false, NULL);
7146 if (TREE_CODE (value) == INTEGER_CST)
7147 pedwarn (loc, OPT_pedantic,
7148 "enumerator value for %qE is not an integer "
7149 "constant expression", name);
7151 if (TREE_CODE (value) != INTEGER_CST)
7153 error ("enumerator value for %qE is not an integer constant",
7159 value = default_conversion (value);
7160 constant_expression_warning (value);
7165 /* Default based on previous value. */
7166 /* It should no longer be possible to have NON_LVALUE_EXPR
7170 value = the_enum->enum_next_value;
7171 if (the_enum->enum_overflow)
7172 error_at (loc, "overflow in enumeration values");
7174 /* Even though the underlying type of an enum is unspecified, the
7175 type of enumeration constants is explicitly defined as int
7176 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7178 else if (!int_fits_type_p (value, integer_type_node))
7179 pedwarn (loc, OPT_pedantic,
7180 "ISO C restricts enumerator values to range of %<int%>");
7182 /* The ISO C Standard mandates enumerators to have type int, even
7183 though the underlying type of an enum type is unspecified.
7184 However, GCC allows enumerators of any integer type as an
7185 extensions. Here we convert any enumerators that fit in an int
7186 to type int, to avoid promotions to unsigned types when comparing
7187 integers with enumerators that fit in the int range. When
7188 -pedantic is given, we would have already warned about those that
7189 don't fit. We have to do this here rather than in finish_enum
7190 because this value may be used to define more enumerators. */
7191 if (int_fits_type_p (value, integer_type_node))
7192 value = convert (integer_type_node, value);
7194 /* Set basis for default for next value. */
7195 the_enum->enum_next_value
7197 (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location,
7198 PLUS_EXPR, value, integer_one_node, 0);
7199 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7201 /* Now create a declaration for the enum value name. */
7203 type = TREE_TYPE (value);
7204 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7205 TYPE_PRECISION (integer_type_node)),
7206 (TYPE_PRECISION (type)
7207 >= TYPE_PRECISION (integer_type_node)
7208 && TYPE_UNSIGNED (type)));
7210 decl = build_decl (loc, CONST_DECL, name, type);
7211 DECL_INITIAL (decl) = convert (type, value);
7214 return tree_cons (decl, value, NULL_TREE);
7218 /* Create the FUNCTION_DECL for a function definition.
7219 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7220 the declaration; they describe the function's name and the type it returns,
7221 but twisted together in a fashion that parallels the syntax of C.
7223 This function creates a binding context for the function body
7224 as well as setting up the FUNCTION_DECL in current_function_decl.
7226 Returns 1 on success. If the DECLARATOR is not suitable for a function
7227 (it defines a datum instead), we return 0, which tells
7228 yyparse to report a parse error. */
7231 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7234 tree decl1, old_decl;
7235 tree restype, resdecl;
7238 current_function_returns_value = 0; /* Assume, until we see it does. */
7239 current_function_returns_null = 0;
7240 current_function_returns_abnormally = 0;
7241 warn_about_return_type = 0;
7242 c_switch_stack = NULL;
7244 /* Indicate no valid break/continue context by setting these variables
7245 to some non-null, non-label value. We'll notice and emit the proper
7246 error message in c_finish_bc_stmt. */
7247 c_break_label = c_cont_label = size_zero_node;
7249 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7250 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7252 /* If the declarator is not suitable for a function definition,
7253 cause a syntax error. */
7257 loc = DECL_SOURCE_LOCATION (decl1);
7259 decl_attributes (&decl1, attributes, 0);
7261 if (DECL_DECLARED_INLINE_P (decl1)
7262 && DECL_UNINLINABLE (decl1)
7263 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7264 warning_at (loc, OPT_Wattributes,
7265 "inline function %qD given attribute noinline",
7268 /* Handle gnu_inline attribute. */
7269 if (declspecs->inline_p
7270 && !flag_gnu89_inline
7271 && TREE_CODE (decl1) == FUNCTION_DECL
7272 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7273 || current_function_decl))
7275 if (declspecs->storage_class != csc_static)
7276 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7279 announce_function (decl1);
7281 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7283 error_at (loc, "return type is an incomplete type");
7284 /* Make it return void instead. */
7286 = build_function_type (void_type_node,
7287 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7290 if (warn_about_return_type)
7291 pedwarn_c99 (loc, flag_isoc99 ? 0
7292 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7293 "return type defaults to %<int%>");
7295 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7296 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7297 DECL_INITIAL (decl1) = error_mark_node;
7299 /* If this definition isn't a prototype and we had a prototype declaration
7300 before, copy the arg type info from that prototype. */
7301 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7302 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7304 current_function_prototype_locus = UNKNOWN_LOCATION;
7305 current_function_prototype_built_in = false;
7306 current_function_prototype_arg_types = NULL_TREE;
7307 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
7309 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7310 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7311 TREE_TYPE (TREE_TYPE (old_decl))))
7313 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7315 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7316 current_function_prototype_built_in
7317 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7318 current_function_prototype_arg_types
7319 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7321 if (TREE_PUBLIC (decl1))
7323 /* If there is an external prototype declaration of this
7324 function, record its location but do not copy information
7325 to this decl. This may be an invisible declaration
7326 (built-in or in a scope which has finished) or simply
7327 have more refined argument types than any declaration
7329 struct c_binding *b;
7330 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7331 if (B_IN_SCOPE (b, external_scope))
7335 tree ext_decl, ext_type;
7337 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7338 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7339 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7340 TREE_TYPE (ext_type)))
7342 current_function_prototype_locus
7343 = DECL_SOURCE_LOCATION (ext_decl);
7344 current_function_prototype_built_in
7345 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7346 current_function_prototype_arg_types
7347 = TYPE_ARG_TYPES (ext_type);
7353 /* Optionally warn of old-fashioned def with no previous prototype. */
7354 if (warn_strict_prototypes
7355 && old_decl != error_mark_node
7356 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
7357 && C_DECL_ISNT_PROTOTYPE (old_decl))
7358 warning_at (loc, OPT_Wstrict_prototypes,
7359 "function declaration isn%'t a prototype");
7360 /* Optionally warn of any global def with no previous prototype. */
7361 else if (warn_missing_prototypes
7362 && old_decl != error_mark_node
7363 && TREE_PUBLIC (decl1)
7364 && !MAIN_NAME_P (DECL_NAME (decl1))
7365 && C_DECL_ISNT_PROTOTYPE (old_decl))
7366 warning_at (loc, OPT_Wmissing_prototypes,
7367 "no previous prototype for %qD", decl1);
7368 /* Optionally warn of any def with no previous prototype
7369 if the function has already been used. */
7370 else if (warn_missing_prototypes
7372 && old_decl != error_mark_node
7373 && TREE_USED (old_decl)
7374 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
7375 warning_at (loc, OPT_Wmissing_prototypes,
7376 "%qD was used with no prototype before its definition", decl1);
7377 /* Optionally warn of any global def with no previous declaration. */
7378 else if (warn_missing_declarations
7379 && TREE_PUBLIC (decl1)
7381 && !MAIN_NAME_P (DECL_NAME (decl1)))
7382 warning_at (loc, OPT_Wmissing_declarations,
7383 "no previous declaration for %qD",
7385 /* Optionally warn of any def with no previous declaration
7386 if the function has already been used. */
7387 else if (warn_missing_declarations
7389 && old_decl != error_mark_node
7390 && TREE_USED (old_decl)
7391 && C_DECL_IMPLICIT (old_decl))
7392 warning_at (loc, OPT_Wmissing_declarations,
7393 "%qD was used with no declaration before its definition", decl1);
7395 /* This function exists in static storage.
7396 (This does not mean `static' in the C sense!) */
7397 TREE_STATIC (decl1) = 1;
7399 /* A nested function is not global. */
7400 if (current_function_decl != 0)
7401 TREE_PUBLIC (decl1) = 0;
7403 /* This is the earliest point at which we might know the assembler
7404 name of the function. Thus, if it's set before this, die horribly. */
7405 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
7407 /* If #pragma weak was used, mark the decl weak now. */
7408 if (current_scope == file_scope)
7409 maybe_apply_pragma_weak (decl1);
7411 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7412 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
7414 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
7415 != integer_type_node)
7416 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
7418 check_main_parameter_types (decl1);
7420 if (!TREE_PUBLIC (decl1))
7421 pedwarn (loc, OPT_Wmain,
7422 "%qD is normally a non-static function", decl1);
7425 /* Record the decl so that the function name is defined.
7426 If we already have a decl for this name, and it is a FUNCTION_DECL,
7427 use the old decl. */
7429 current_function_decl = pushdecl (decl1);
7432 declare_parm_level ();
7434 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
7435 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
7436 DECL_ARTIFICIAL (resdecl) = 1;
7437 DECL_IGNORED_P (resdecl) = 1;
7438 DECL_RESULT (current_function_decl) = resdecl;
7440 start_fname_decls ();
7445 /* Subroutine of store_parm_decls which handles new-style function
7446 definitions (prototype format). The parms already have decls, so we
7447 need only record them as in effect and complain if any redundant
7448 old-style parm decls were written. */
7450 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
7454 if (current_scope->bindings)
7456 error_at (DECL_SOURCE_LOCATION (fndecl),
7457 "old-style parameter declarations in prototyped "
7458 "function definition");
7460 /* Get rid of the old-style declarations. */
7464 /* Don't issue this warning for nested functions, and don't issue this
7465 warning if we got here because ARG_INFO_TYPES was error_mark_node
7466 (this happens when a function definition has just an ellipsis in
7467 its parameter list). */
7468 else if (!in_system_header && !current_function_scope
7469 && arg_info->types != error_mark_node)
7470 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
7471 "traditional C rejects ISO C style function definitions");
7473 /* Now make all the parameter declarations visible in the function body.
7474 We can bypass most of the grunt work of pushdecl. */
7475 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
7477 DECL_CONTEXT (decl) = current_function_decl;
7478 if (DECL_NAME (decl))
7480 bind (DECL_NAME (decl), decl, current_scope,
7481 /*invisible=*/false, /*nested=*/false,
7483 if (!TREE_USED (decl))
7484 warn_if_shadowing (decl);
7487 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
7490 /* Record the parameter list in the function declaration. */
7491 DECL_ARGUMENTS (fndecl) = arg_info->parms;
7493 /* Now make all the ancillary declarations visible, likewise. */
7494 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
7496 DECL_CONTEXT (decl) = current_function_decl;
7497 if (DECL_NAME (decl))
7498 bind (DECL_NAME (decl), decl, current_scope,
7499 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7502 /* And all the tag declarations. */
7503 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
7504 if (TREE_PURPOSE (decl))
7505 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
7506 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7509 /* Subroutine of store_parm_decls which handles old-style function
7510 definitions (separate parameter list and declarations). */
7513 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
7515 struct c_binding *b;
7516 tree parm, decl, last;
7517 tree parmids = arg_info->parms;
7518 struct pointer_set_t *seen_args = pointer_set_create ();
7520 if (!in_system_header)
7521 warning_at (DECL_SOURCE_LOCATION (fndecl),
7522 OPT_Wold_style_definition, "old-style function definition");
7524 /* Match each formal parameter name with its declaration. Save each
7525 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7526 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7528 if (TREE_VALUE (parm) == 0)
7530 error_at (DECL_SOURCE_LOCATION (fndecl),
7531 "parameter name missing from parameter list");
7532 TREE_PURPOSE (parm) = 0;
7536 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
7537 if (b && B_IN_CURRENT_SCOPE (b))
7540 /* If we got something other than a PARM_DECL it is an error. */
7541 if (TREE_CODE (decl) != PARM_DECL)
7542 error_at (DECL_SOURCE_LOCATION (decl),
7543 "%qD declared as a non-parameter", decl);
7544 /* If the declaration is already marked, we have a duplicate
7545 name. Complain and ignore the duplicate. */
7546 else if (pointer_set_contains (seen_args, decl))
7548 error_at (DECL_SOURCE_LOCATION (decl),
7549 "multiple parameters named %qD", decl);
7550 TREE_PURPOSE (parm) = 0;
7553 /* If the declaration says "void", complain and turn it into
7555 else if (VOID_TYPE_P (TREE_TYPE (decl)))
7557 error_at (DECL_SOURCE_LOCATION (decl),
7558 "parameter %qD declared with void type", decl);
7559 TREE_TYPE (decl) = integer_type_node;
7560 DECL_ARG_TYPE (decl) = integer_type_node;
7561 layout_decl (decl, 0);
7563 warn_if_shadowing (decl);
7565 /* If no declaration found, default to int. */
7568 /* FIXME diagnostics: This should be the location of the argument,
7569 not the FNDECL. E.g., for an old-style declaration
7571 int f10(v) { blah; }
7573 We should use the location of the V, not the F10.
7574 Unfortunately, the V is an IDENTIFIER_NODE which has no
7575 location. In the future we need locations for c_arg_info
7578 See gcc.dg/Wshadow-3.c for an example of this problem. */
7579 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
7580 PARM_DECL, TREE_VALUE (parm), integer_type_node);
7581 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
7583 warn_if_shadowing (decl);
7586 pedwarn (DECL_SOURCE_LOCATION (decl),
7587 0, "type of %qD defaults to %<int%>", decl);
7589 warning_at (DECL_SOURCE_LOCATION (decl),
7590 OPT_Wmissing_parameter_type,
7591 "type of %qD defaults to %<int%>", decl);
7594 TREE_PURPOSE (parm) = decl;
7595 pointer_set_insert (seen_args, decl);
7598 /* Now examine the parms chain for incomplete declarations
7599 and declarations with no corresponding names. */
7601 for (b = current_scope->bindings; b; b = b->prev)
7604 if (TREE_CODE (parm) != PARM_DECL)
7607 if (TREE_TYPE (parm) != error_mark_node
7608 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
7610 error_at (DECL_SOURCE_LOCATION (parm),
7611 "parameter %qD has incomplete type", parm);
7612 TREE_TYPE (parm) = error_mark_node;
7615 if (!pointer_set_contains (seen_args, parm))
7617 error_at (DECL_SOURCE_LOCATION (parm),
7618 "declaration for parameter %qD but no such parameter",
7621 /* Pretend the parameter was not missing.
7622 This gets us to a standard state and minimizes
7623 further error messages. */
7624 parmids = chainon (parmids, tree_cons (parm, 0, 0));
7628 /* Chain the declarations together in the order of the list of
7629 names. Store that chain in the function decl, replacing the
7630 list of names. Update the current scope to match. */
7631 DECL_ARGUMENTS (fndecl) = 0;
7633 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7634 if (TREE_PURPOSE (parm))
7636 if (parm && TREE_PURPOSE (parm))
7638 last = TREE_PURPOSE (parm);
7639 DECL_ARGUMENTS (fndecl) = last;
7641 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
7642 if (TREE_PURPOSE (parm))
7644 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7645 last = TREE_PURPOSE (parm);
7647 TREE_CHAIN (last) = 0;
7650 pointer_set_destroy (seen_args);
7652 /* If there was a previous prototype,
7653 set the DECL_ARG_TYPE of each argument according to
7654 the type previously specified, and report any mismatches. */
7656 if (current_function_prototype_arg_types)
7659 for (parm = DECL_ARGUMENTS (fndecl),
7660 type = current_function_prototype_arg_types;
7661 parm || (type && TREE_VALUE (type) != error_mark_node
7662 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
7663 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
7665 if (parm == 0 || type == 0
7666 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
7668 if (current_function_prototype_built_in)
7669 warning_at (DECL_SOURCE_LOCATION (fndecl),
7670 0, "number of arguments doesn%'t match "
7671 "built-in prototype");
7674 /* FIXME diagnostics: This should be the location of
7675 FNDECL, but there is bug when a prototype is
7676 declared inside function context, but defined
7677 outside of it (e.g., gcc.dg/pr15698-2.c). In
7678 which case FNDECL gets the location of the
7679 prototype, not the definition. */
7680 error_at (input_location,
7681 "number of arguments doesn%'t match prototype");
7683 error_at (current_function_prototype_locus,
7684 "prototype declaration");
7688 /* Type for passing arg must be consistent with that
7689 declared for the arg. ISO C says we take the unqualified
7690 type for parameters declared with qualified type. */
7691 if (TREE_TYPE (parm) != error_mark_node
7692 && TREE_TYPE (type) != error_mark_node
7693 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
7694 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
7696 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
7697 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
7699 /* Adjust argument to match prototype. E.g. a previous
7700 `int foo(float);' prototype causes
7701 `int foo(x) float x; {...}' to be treated like
7702 `int foo(float x) {...}'. This is particularly
7703 useful for argument types like uid_t. */
7704 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
7706 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
7707 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
7708 && TYPE_PRECISION (TREE_TYPE (parm))
7709 < TYPE_PRECISION (integer_type_node))
7710 DECL_ARG_TYPE (parm) = integer_type_node;
7712 /* ??? Is it possible to get here with a
7713 built-in prototype or will it always have
7714 been diagnosed as conflicting with an
7715 old-style definition and discarded? */
7716 if (current_function_prototype_built_in)
7717 warning_at (DECL_SOURCE_LOCATION (parm),
7718 OPT_pedantic, "promoted argument %qD "
7719 "doesn%'t match built-in prototype", parm);
7722 pedwarn (DECL_SOURCE_LOCATION (parm),
7723 OPT_pedantic, "promoted argument %qD "
7724 "doesn%'t match prototype", parm);
7725 pedwarn (current_function_prototype_locus, OPT_pedantic,
7726 "prototype declaration");
7731 if (current_function_prototype_built_in)
7732 warning_at (DECL_SOURCE_LOCATION (parm),
7733 0, "argument %qD doesn%'t match "
7734 "built-in prototype", parm);
7737 error_at (DECL_SOURCE_LOCATION (parm),
7738 "argument %qD doesn%'t match prototype", parm);
7739 error_at (current_function_prototype_locus,
7740 "prototype declaration");
7745 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
7748 /* Otherwise, create a prototype that would match. */
7752 tree actual = 0, last = 0, type;
7754 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
7756 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
7758 TREE_CHAIN (last) = type;
7763 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
7765 TREE_CHAIN (last) = type;
7769 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7770 of the type of this function, but we need to avoid having this
7771 affect the types of other similarly-typed functions, so we must
7772 first force the generation of an identical (but separate) type
7773 node for the relevant function type. The new node we create
7774 will be a variant of the main variant of the original function
7777 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
7779 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
7783 /* Store parameter declarations passed in ARG_INFO into the current
7784 function declaration. */
7787 store_parm_decls_from (struct c_arg_info *arg_info)
7789 current_function_arg_info = arg_info;
7790 store_parm_decls ();
7793 /* Store the parameter declarations into the current function declaration.
7794 This is called after parsing the parameter declarations, before
7795 digesting the body of the function.
7797 For an old-style definition, construct a prototype out of the old-style
7798 parameter declarations and inject it into the function's type. */
7801 store_parm_decls (void)
7803 tree fndecl = current_function_decl;
7806 /* The argument information block for FNDECL. */
7807 struct c_arg_info *arg_info = current_function_arg_info;
7808 current_function_arg_info = 0;
7810 /* True if this definition is written with a prototype. Note:
7811 despite C99 6.7.5.3p14, we can *not* treat an empty argument
7812 list in a function definition as equivalent to (void) -- an
7813 empty argument list specifies the function has no parameters,
7814 but only (void) sets up a prototype for future calls. */
7815 proto = arg_info->types != 0;
7818 store_parm_decls_newstyle (fndecl, arg_info);
7820 store_parm_decls_oldstyle (fndecl, arg_info);
7822 /* The next call to push_scope will be a function body. */
7824 next_is_function_body = true;
7826 /* Write a record describing this function definition to the prototypes
7827 file (if requested). */
7829 gen_aux_info_record (fndecl, 1, 0, proto);
7831 /* Initialize the RTL code for the function. */
7832 allocate_struct_function (fndecl, false);
7834 /* Begin the statement tree for this function. */
7835 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
7837 /* ??? Insert the contents of the pending sizes list into the function
7838 to be evaluated. The only reason left to have this is
7839 void foo(int n, int array[n++])
7840 because we throw away the array type in favor of a pointer type, and
7841 thus won't naturally see the SAVE_EXPR containing the increment. All
7842 other pending sizes would be handled by gimplify_parameters. */
7845 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
7846 add_stmt (TREE_VALUE (t));
7849 /* Even though we're inside a function body, we still don't want to
7850 call expand_expr to calculate the size of a variable-sized array.
7851 We haven't necessarily assigned RTL to all variables yet, so it's
7852 not safe to try to expand expressions involving them. */
7853 cfun->dont_save_pending_sizes_p = 1;
7857 /* Finish up a function declaration and compile that function
7858 all the way to assembler language output. The free the storage
7859 for the function definition.
7861 This is called after parsing the body of the function definition. */
7864 finish_function (void)
7866 tree fndecl = current_function_decl;
7868 if (TREE_CODE (fndecl) == FUNCTION_DECL
7869 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
7871 tree args = DECL_ARGUMENTS (fndecl);
7872 for (; args; args = TREE_CHAIN (args))
7874 tree type = TREE_TYPE (args);
7875 if (INTEGRAL_TYPE_P (type)
7876 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
7877 DECL_ARG_TYPE (args) = integer_type_node;
7881 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
7882 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7884 /* Must mark the RESULT_DECL as being in this function. */
7886 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
7887 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7889 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
7890 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7891 == integer_type_node && flag_isoc99)
7893 /* Hack. We don't want the middle-end to warn that this return
7894 is unreachable, so we mark its location as special. Using
7895 UNKNOWN_LOCATION has the problem that it gets clobbered in
7896 annotate_one_with_locus. A cleaner solution might be to
7897 ensure ! should_carry_locus_p (stmt), but that needs a flag.
7899 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
7902 /* Tie off the statement tree for this function. */
7903 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
7905 finish_fname_decls ();
7907 /* Complain if there's just no return statement. */
7908 if (warn_return_type
7909 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
7910 && !current_function_returns_value && !current_function_returns_null
7911 /* Don't complain if we are no-return. */
7912 && !current_function_returns_abnormally
7913 /* Don't warn for main(). */
7914 && !MAIN_NAME_P (DECL_NAME (fndecl))
7915 /* Or if they didn't actually specify a return type. */
7916 && !C_FUNCTION_IMPLICIT_INT (fndecl)
7917 /* Normally, with -Wreturn-type, flow will complain, but we might
7918 optimize out static functions. */
7919 && !TREE_PUBLIC (fndecl))
7921 warning (OPT_Wreturn_type,
7922 "no return statement in function returning non-void");
7923 TREE_NO_WARNING (fndecl) = 1;
7926 /* Store the end of the function, so that we get good line number
7927 info for the epilogue. */
7928 cfun->function_end_locus = input_location;
7930 /* Finalize the ELF visibility for the function. */
7931 c_determine_visibility (fndecl);
7933 /* For GNU C extern inline functions disregard inline limits. */
7934 if (DECL_EXTERNAL (fndecl)
7935 && DECL_DECLARED_INLINE_P (fndecl))
7936 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
7938 /* Genericize before inlining. Delay genericizing nested functions
7939 until their parent function is genericized. Since finalizing
7940 requires GENERIC, delay that as well. */
7942 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
7943 && !undef_nested_function)
7945 if (!decl_function_context (fndecl))
7947 c_genericize (fndecl);
7949 /* ??? Objc emits functions after finalizing the compilation unit.
7950 This should be cleaned up later and this conditional removed. */
7951 if (cgraph_global_info_ready)
7953 cgraph_add_new_function (fndecl, false);
7956 cgraph_finalize_function (fndecl, false);
7960 /* Register this function with cgraph just far enough to get it
7961 added to our parent's nested function list. Handy, since the
7962 C front end doesn't have such a list. */
7963 (void) cgraph_node (fndecl);
7967 if (!decl_function_context (fndecl))
7968 undef_nested_function = false;
7970 /* We're leaving the context of this function, so zap cfun.
7971 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
7972 tree_rest_of_compilation. */
7974 current_function_decl = NULL;
7977 /* Check the declarations given in a for-loop for satisfying the C99
7978 constraints. If exactly one such decl is found, return it. LOC is
7979 the location of the opening parenthesis of the for loop. */
7982 check_for_loop_decls (location_t loc)
7984 struct c_binding *b;
7985 tree one_decl = NULL_TREE;
7990 static bool hint = true;
7991 /* If we get here, declarations have been used in a for loop without
7992 the C99 for loop scope. This doesn't make much sense, so don't
7994 error_at (loc, "%<for%> loop initial declarations "
7995 "are only allowed in C99 mode");
7999 "use option -std=c99 or -std=gnu99 to compile your code");
8004 /* C99 subclause 6.8.5 paragraph 3:
8006 [#3] The declaration part of a for statement shall only
8007 declare identifiers for objects having storage class auto or
8010 It isn't clear whether, in this sentence, "identifiers" binds to
8011 "shall only declare" or to "objects" - that is, whether all identifiers
8012 declared must be identifiers for objects, or whether the restriction
8013 only applies to those that are. (A question on this in comp.std.c
8014 in November 2000 received no answer.) We implement the strictest
8015 interpretation, to avoid creating an extension which later causes
8018 for (b = current_scope->bindings; b; b = b->prev)
8021 tree decl = b->decl;
8026 switch (TREE_CODE (decl))
8030 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8031 if (TREE_STATIC (decl))
8033 "declaration of static variable %qD in %<for%> loop "
8034 "initial declaration", decl);
8035 else if (DECL_EXTERNAL (decl))
8037 "declaration of %<extern%> variable %qD in %<for%> loop "
8038 "initial declaration", decl);
8044 "%<struct %E%> declared in %<for%> loop initial "
8049 "%<union %E%> declared in %<for%> loop initial declaration",
8053 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8054 "initial declaration", id);
8057 error_at (loc, "declaration of non-variable "
8058 "%qD in %<for%> loop initial declaration", decl);
8065 return n_decls == 1 ? one_decl : NULL_TREE;
8068 /* Save and reinitialize the variables
8069 used during compilation of a C function. */
8072 c_push_function_context (void)
8074 struct language_function *p;
8075 p = GGC_NEW (struct language_function);
8078 p->base.x_stmt_tree = c_stmt_tree;
8079 p->x_break_label = c_break_label;
8080 p->x_cont_label = c_cont_label;
8081 p->x_switch_stack = c_switch_stack;
8082 p->arg_info = current_function_arg_info;
8083 p->returns_value = current_function_returns_value;
8084 p->returns_null = current_function_returns_null;
8085 p->returns_abnormally = current_function_returns_abnormally;
8086 p->warn_about_return_type = warn_about_return_type;
8088 push_function_context ();
8091 /* Restore the variables used during compilation of a C function. */
8094 c_pop_function_context (void)
8096 struct language_function *p;
8098 pop_function_context ();
8100 cfun->language = NULL;
8102 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8103 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8105 /* Stop pointing to the local nodes about to be freed. */
8106 /* But DECL_INITIAL must remain nonzero so we know this
8107 was an actual function definition. */
8108 DECL_INITIAL (current_function_decl) = error_mark_node;
8109 DECL_ARGUMENTS (current_function_decl) = 0;
8112 c_stmt_tree = p->base.x_stmt_tree;
8113 c_break_label = p->x_break_label;
8114 c_cont_label = p->x_cont_label;
8115 c_switch_stack = p->x_switch_stack;
8116 current_function_arg_info = p->arg_info;
8117 current_function_returns_value = p->returns_value;
8118 current_function_returns_null = p->returns_null;
8119 current_function_returns_abnormally = p->returns_abnormally;
8120 warn_about_return_type = p->warn_about_return_type;
8123 /* The functions below are required for functionality of doing
8124 function at once processing in the C front end. Currently these
8125 functions are not called from anywhere in the C front end, but as
8126 these changes continue, that will change. */
8128 /* Returns the stmt_tree (if any) to which statements are currently
8129 being added. If there is no active statement-tree, NULL is
8133 current_stmt_tree (void)
8135 return &c_stmt_tree;
8138 /* Return the global value of T as a symbol. */
8141 identifier_global_value (tree t)
8143 struct c_binding *b;
8145 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8146 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8152 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8153 otherwise the name is found in ridpointers from RID_INDEX. */
8156 record_builtin_type (enum rid rid_index, const char *name, tree type)
8160 id = ridpointers[(int) rid_index];
8162 id = get_identifier (name);
8163 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8165 if (debug_hooks->type_decl)
8166 debug_hooks->type_decl (decl, false);
8169 /* Build the void_list_node (void_type_node having been created). */
8171 build_void_list_node (void)
8173 tree t = build_tree_list (NULL_TREE, void_type_node);
8177 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8180 build_c_parm (struct c_declspecs *specs, tree attrs,
8181 struct c_declarator *declarator)
8183 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8186 ret->declarator = declarator;
8190 /* Return a declarator with nested attributes. TARGET is the inner
8191 declarator to which these attributes apply. ATTRS are the
8194 struct c_declarator *
8195 build_attrs_declarator (tree attrs, struct c_declarator *target)
8197 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8198 ret->kind = cdk_attrs;
8199 ret->declarator = target;
8200 ret->u.attrs = attrs;
8204 /* Return a declarator for a function with arguments specified by ARGS
8205 and return type specified by TARGET. */
8207 struct c_declarator *
8208 build_function_declarator (struct c_arg_info *args,
8209 struct c_declarator *target)
8211 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8212 ret->kind = cdk_function;
8213 ret->declarator = target;
8214 ret->u.arg_info = args;
8218 /* Return a declarator for the identifier IDENT (which may be
8219 NULL_TREE for an abstract declarator). */
8221 struct c_declarator *
8222 build_id_declarator (tree ident)
8224 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8226 ret->declarator = 0;
8228 /* Default value - may get reset to a more precise location. */
8229 ret->id_loc = input_location;
8233 /* Return something to represent absolute declarators containing a *.
8234 TARGET is the absolute declarator that the * contains.
8235 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8236 to apply to the pointer type. */
8238 struct c_declarator *
8239 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
8240 struct c_declarator *target)
8244 struct c_declarator *itarget = target;
8245 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8246 if (type_quals_attrs)
8248 attrs = type_quals_attrs->attrs;
8249 quals = quals_from_declspecs (type_quals_attrs);
8250 if (attrs != NULL_TREE)
8251 itarget = build_attrs_declarator (attrs, target);
8253 ret->kind = cdk_pointer;
8254 ret->declarator = itarget;
8255 ret->u.pointer_quals = quals;
8259 /* Return a pointer to a structure for an empty list of declaration
8262 struct c_declspecs *
8263 build_null_declspecs (void)
8265 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
8270 ret->typespec_word = cts_none;
8271 ret->storage_class = csc_none;
8272 ret->expr_const_operands = true;
8273 ret->declspecs_seen_p = false;
8274 ret->type_seen_p = false;
8275 ret->non_sc_seen_p = false;
8276 ret->typedef_p = false;
8277 ret->tag_defined_p = false;
8278 ret->explicit_signed_p = false;
8279 ret->deprecated_p = false;
8280 ret->default_int_p = false;
8281 ret->long_p = false;
8282 ret->long_long_p = false;
8283 ret->short_p = false;
8284 ret->signed_p = false;
8285 ret->unsigned_p = false;
8286 ret->complex_p = false;
8287 ret->inline_p = false;
8288 ret->thread_p = false;
8289 ret->const_p = false;
8290 ret->volatile_p = false;
8291 ret->restrict_p = false;
8292 ret->saturating_p = false;
8296 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8299 struct c_declspecs *
8300 declspecs_add_qual (struct c_declspecs *specs, tree qual)
8304 specs->non_sc_seen_p = true;
8305 specs->declspecs_seen_p = true;
8306 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
8307 && C_IS_RESERVED_WORD (qual));
8308 i = C_RID_CODE (qual);
8312 dupe = specs->const_p;
8313 specs->const_p = true;
8316 dupe = specs->volatile_p;
8317 specs->volatile_p = true;
8320 dupe = specs->restrict_p;
8321 specs->restrict_p = true;
8326 if (dupe && !flag_isoc99)
8327 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
8331 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8334 struct c_declspecs *
8335 declspecs_add_type (location_t loc, struct c_declspecs *specs,
8336 struct c_typespec spec)
8338 tree type = spec.spec;
8339 specs->non_sc_seen_p = true;
8340 specs->declspecs_seen_p = true;
8341 specs->type_seen_p = true;
8342 if (TREE_DEPRECATED (type))
8343 specs->deprecated_p = true;
8345 /* Handle type specifier keywords. */
8346 if (TREE_CODE (type) == IDENTIFIER_NODE
8347 && C_IS_RESERVED_WORD (type)
8348 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
8350 enum rid i = C_RID_CODE (type);
8353 error_at (loc, "two or more data types in declaration specifiers");
8356 if ((int) i <= (int) RID_LAST_MODIFIER)
8358 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8363 if (specs->long_long_p)
8365 error_at (loc, "%<long long long%> is too long for GCC");
8370 if (specs->typespec_word == cts_double)
8373 ("both %<long long%> and %<double%> in "
8374 "declaration specifiers"));
8377 pedwarn_c90 (loc, OPT_Wlong_long,
8378 "ISO C90 does not support %<long long%>");
8379 specs->long_long_p = 1;
8384 ("both %<long%> and %<short%> in "
8385 "declaration specifiers"));
8386 else if (specs->typespec_word == cts_void)
8388 ("both %<long%> and %<void%> in "
8389 "declaration specifiers"));
8390 else if (specs->typespec_word == cts_bool)
8392 ("both %<long%> and %<_Bool%> in "
8393 "declaration specifiers"));
8394 else if (specs->typespec_word == cts_char)
8396 ("both %<long%> and %<char%> in "
8397 "declaration specifiers"));
8398 else if (specs->typespec_word == cts_float)
8400 ("both %<long%> and %<float%> in "
8401 "declaration specifiers"));
8402 else if (specs->typespec_word == cts_dfloat32)
8404 ("both %<long%> and %<_Decimal32%> in "
8405 "declaration specifiers"));
8406 else if (specs->typespec_word == cts_dfloat64)
8408 ("both %<long%> and %<_Decimal64%> in "
8409 "declaration specifiers"));
8410 else if (specs->typespec_word == cts_dfloat128)
8412 ("both %<long%> and %<_Decimal128%> in "
8413 "declaration specifiers"));
8415 specs->long_p = true;
8418 dupe = specs->short_p;
8421 ("both %<long%> and %<short%> in "
8422 "declaration specifiers"));
8423 else if (specs->typespec_word == cts_void)
8425 ("both %<short%> and %<void%> in "
8426 "declaration specifiers"));
8427 else if (specs->typespec_word == cts_bool)
8429 ("both %<short%> and %<_Bool%> in "
8430 "declaration specifiers"));
8431 else if (specs->typespec_word == cts_char)
8433 ("both %<short%> and %<char%> in "
8434 "declaration specifiers"));
8435 else if (specs->typespec_word == cts_float)
8437 ("both %<short%> and %<float%> in "
8438 "declaration specifiers"));
8439 else if (specs->typespec_word == cts_double)
8441 ("both %<short%> and %<double%> in "
8442 "declaration specifiers"));
8443 else if (specs->typespec_word == cts_dfloat32)
8445 ("both %<short%> and %<_Decimal32%> in "
8446 "declaration specifiers"));
8447 else if (specs->typespec_word == cts_dfloat64)
8449 ("both %<short%> and %<_Decimal64%> in "
8450 "declaration specifiers"));
8451 else if (specs->typespec_word == cts_dfloat128)
8453 ("both %<short%> and %<_Decimal128%> in "
8454 "declaration specifiers"));
8456 specs->short_p = true;
8459 dupe = specs->signed_p;
8460 if (specs->unsigned_p)
8462 ("both %<signed%> and %<unsigned%> in "
8463 "declaration specifiers"));
8464 else if (specs->typespec_word == cts_void)
8466 ("both %<signed%> and %<void%> in "
8467 "declaration specifiers"));
8468 else if (specs->typespec_word == cts_bool)
8470 ("both %<signed%> and %<_Bool%> in "
8471 "declaration specifiers"));
8472 else if (specs->typespec_word == cts_float)
8474 ("both %<signed%> and %<float%> in "
8475 "declaration specifiers"));
8476 else if (specs->typespec_word == cts_double)
8478 ("both %<signed%> and %<double%> in "
8479 "declaration specifiers"));
8480 else if (specs->typespec_word == cts_dfloat32)
8482 ("both %<signed%> and %<_Decimal32%> in "
8483 "declaration specifiers"));
8484 else if (specs->typespec_word == cts_dfloat64)
8486 ("both %<signed%> and %<_Decimal64%> in "
8487 "declaration specifiers"));
8488 else if (specs->typespec_word == cts_dfloat128)
8490 ("both %<signed%> and %<_Decimal128%> in "
8491 "declaration specifiers"));
8493 specs->signed_p = true;
8496 dupe = specs->unsigned_p;
8497 if (specs->signed_p)
8499 ("both %<signed%> and %<unsigned%> in "
8500 "declaration specifiers"));
8501 else if (specs->typespec_word == cts_void)
8503 ("both %<unsigned%> and %<void%> in "
8504 "declaration specifiers"));
8505 else if (specs->typespec_word == cts_bool)
8507 ("both %<unsigned%> and %<_Bool%> in "
8508 "declaration specifiers"));
8509 else if (specs->typespec_word == cts_float)
8511 ("both %<unsigned%> and %<float%> in "
8512 "declaration specifiers"));
8513 else if (specs->typespec_word == cts_double)
8515 ("both %<unsigned%> and %<double%> in "
8516 "declaration specifiers"));
8517 else if (specs->typespec_word == cts_dfloat32)
8519 ("both %<unsigned%> and %<_Decimal32%> in "
8520 "declaration specifiers"));
8521 else if (specs->typespec_word == cts_dfloat64)
8523 ("both %<unsigned%> and %<_Decimal64%> in "
8524 "declaration specifiers"));
8525 else if (specs->typespec_word == cts_dfloat128)
8527 ("both %<unsigned%> and %<_Decimal128%> in "
8528 "declaration specifiers"));
8530 specs->unsigned_p = true;
8533 dupe = specs->complex_p;
8534 if (!flag_isoc99 && !in_system_header)
8535 pedwarn (loc, OPT_pedantic,
8536 "ISO C90 does not support complex types");
8537 if (specs->typespec_word == cts_void)
8539 ("both %<complex%> and %<void%> in "
8540 "declaration specifiers"));
8541 else if (specs->typespec_word == cts_bool)
8543 ("both %<complex%> and %<_Bool%> in "
8544 "declaration specifiers"));
8545 else if (specs->typespec_word == cts_dfloat32)
8547 ("both %<complex%> and %<_Decimal32%> in "
8548 "declaration specifiers"));
8549 else if (specs->typespec_word == cts_dfloat64)
8551 ("both %<complex%> and %<_Decimal64%> in "
8552 "declaration specifiers"));
8553 else if (specs->typespec_word == cts_dfloat128)
8555 ("both %<complex%> and %<_Decimal128%> in "
8556 "declaration specifiers"));
8557 else if (specs->typespec_word == cts_fract)
8559 ("both %<complex%> and %<_Fract%> in "
8560 "declaration specifiers"));
8561 else if (specs->typespec_word == cts_accum)
8563 ("both %<complex%> and %<_Accum%> in "
8564 "declaration specifiers"));
8565 else if (specs->saturating_p)
8567 ("both %<complex%> and %<_Sat%> in "
8568 "declaration specifiers"));
8570 specs->complex_p = true;
8573 dupe = specs->saturating_p;
8574 pedwarn (loc, OPT_pedantic,
8575 "ISO C does not support saturating types");
8576 if (specs->typespec_word == cts_void)
8578 ("both %<_Sat%> and %<void%> in "
8579 "declaration specifiers"));
8580 else if (specs->typespec_word == cts_bool)
8582 ("both %<_Sat%> and %<_Bool%> in "
8583 "declaration specifiers"));
8584 else if (specs->typespec_word == cts_char)
8586 ("both %<_Sat%> and %<char%> in "
8587 "declaration specifiers"));
8588 else if (specs->typespec_word == cts_int)
8590 ("both %<_Sat%> and %<int%> in "
8591 "declaration specifiers"));
8592 else if (specs->typespec_word == cts_float)
8594 ("both %<_Sat%> and %<float%> in "
8595 "declaration specifiers"));
8596 else if (specs->typespec_word == cts_double)
8598 ("both %<_Sat%> and %<double%> in "
8599 "declaration specifiers"));
8600 else if (specs->typespec_word == cts_dfloat32)
8602 ("both %<_Sat%> and %<_Decimal32%> in "
8603 "declaration specifiers"));
8604 else if (specs->typespec_word == cts_dfloat64)
8606 ("both %<_Sat%> and %<_Decimal64%> in "
8607 "declaration specifiers"));
8608 else if (specs->typespec_word == cts_dfloat128)
8610 ("both %<_Sat%> and %<_Decimal128%> in "
8611 "declaration specifiers"));
8612 else if (specs->complex_p)
8614 ("both %<_Sat%> and %<complex%> in "
8615 "declaration specifiers"));
8617 specs->saturating_p = true;
8624 error_at (loc, "duplicate %qE", type);
8630 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8631 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8632 if (specs->typespec_word != cts_none)
8635 "two or more data types in declaration specifiers");
8643 ("both %<long%> and %<void%> in "
8644 "declaration specifiers"));
8645 else if (specs->short_p)
8647 ("both %<short%> and %<void%> in "
8648 "declaration specifiers"));
8649 else if (specs->signed_p)
8651 ("both %<signed%> and %<void%> in "
8652 "declaration specifiers"));
8653 else if (specs->unsigned_p)
8655 ("both %<unsigned%> and %<void%> in "
8656 "declaration specifiers"));
8657 else if (specs->complex_p)
8659 ("both %<complex%> and %<void%> in "
8660 "declaration specifiers"));
8661 else if (specs->saturating_p)
8663 ("both %<_Sat%> and %<void%> in "
8664 "declaration specifiers"));
8666 specs->typespec_word = cts_void;
8671 ("both %<long%> and %<_Bool%> in "
8672 "declaration specifiers"));
8673 else if (specs->short_p)
8675 ("both %<short%> and %<_Bool%> in "
8676 "declaration specifiers"));
8677 else if (specs->signed_p)
8679 ("both %<signed%> and %<_Bool%> in "
8680 "declaration specifiers"));
8681 else if (specs->unsigned_p)
8683 ("both %<unsigned%> and %<_Bool%> in "
8684 "declaration specifiers"));
8685 else if (specs->complex_p)
8687 ("both %<complex%> and %<_Bool%> in "
8688 "declaration specifiers"));
8689 else if (specs->saturating_p)
8691 ("both %<_Sat%> and %<_Bool%> in "
8692 "declaration specifiers"));
8694 specs->typespec_word = cts_bool;
8699 ("both %<long%> and %<char%> in "
8700 "declaration specifiers"));
8701 else if (specs->short_p)
8703 ("both %<short%> and %<char%> in "
8704 "declaration specifiers"));
8705 else if (specs->saturating_p)
8707 ("both %<_Sat%> and %<char%> in "
8708 "declaration specifiers"));
8710 specs->typespec_word = cts_char;
8713 if (specs->saturating_p)
8715 ("both %<_Sat%> and %<int%> in "
8716 "declaration specifiers"));
8718 specs->typespec_word = cts_int;
8723 ("both %<long%> and %<float%> in "
8724 "declaration specifiers"));
8725 else if (specs->short_p)
8727 ("both %<short%> and %<float%> in "
8728 "declaration specifiers"));
8729 else if (specs->signed_p)
8731 ("both %<signed%> and %<float%> in "
8732 "declaration specifiers"));
8733 else if (specs->unsigned_p)
8735 ("both %<unsigned%> and %<float%> in "
8736 "declaration specifiers"));
8737 else if (specs->saturating_p)
8739 ("both %<_Sat%> and %<float%> in "
8740 "declaration specifiers"));
8742 specs->typespec_word = cts_float;
8745 if (specs->long_long_p)
8747 ("both %<long long%> and %<double%> in "
8748 "declaration specifiers"));
8749 else if (specs->short_p)
8751 ("both %<short%> and %<double%> in "
8752 "declaration specifiers"));
8753 else if (specs->signed_p)
8755 ("both %<signed%> and %<double%> in "
8756 "declaration specifiers"));
8757 else if (specs->unsigned_p)
8759 ("both %<unsigned%> and %<double%> in "
8760 "declaration specifiers"));
8761 else if (specs->saturating_p)
8763 ("both %<_Sat%> and %<double%> in "
8764 "declaration specifiers"));
8766 specs->typespec_word = cts_double;
8773 if (i == RID_DFLOAT32)
8775 else if (i == RID_DFLOAT64)
8778 str = "_Decimal128";
8779 if (specs->long_long_p)
8781 ("both %<long long%> and %<%s%> in "
8782 "declaration specifiers"),
8786 ("both %<long%> and %<%s%> in "
8787 "declaration specifiers"),
8789 else if (specs->short_p)
8791 ("both %<short%> and %<%s%> in "
8792 "declaration specifiers"),
8794 else if (specs->signed_p)
8796 ("both %<signed%> and %<%s%> in "
8797 "declaration specifiers"),
8799 else if (specs->unsigned_p)
8801 ("both %<unsigned%> and %<%s%> in "
8802 "declaration specifiers"),
8804 else if (specs->complex_p)
8806 ("both %<complex%> and %<%s%> in "
8807 "declaration specifiers"),
8809 else if (specs->saturating_p)
8811 ("both %<_Sat%> and %<%s%> in "
8812 "declaration specifiers"),
8814 else if (i == RID_DFLOAT32)
8815 specs->typespec_word = cts_dfloat32;
8816 else if (i == RID_DFLOAT64)
8817 specs->typespec_word = cts_dfloat64;
8819 specs->typespec_word = cts_dfloat128;
8821 if (!targetm.decimal_float_supported_p ())
8823 ("decimal floating point not supported "
8824 "for this target"));
8825 pedwarn (loc, OPT_pedantic,
8826 "ISO C does not support decimal floating point");
8836 if (specs->complex_p)
8838 ("both %<complex%> and %<%s%> in "
8839 "declaration specifiers"),
8841 else if (i == RID_FRACT)
8842 specs->typespec_word = cts_fract;
8844 specs->typespec_word = cts_accum;
8846 if (!targetm.fixed_point_supported_p ())
8848 "fixed-point types not supported for this target");
8849 pedwarn (loc, OPT_pedantic,
8850 "ISO C does not support fixed-point types");
8853 /* ObjC reserved word "id", handled below. */
8859 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
8860 form of ObjC type, cases such as "int" and "long" being handled
8861 above), a TYPE (struct, union, enum and typeof specifiers) or an
8862 ERROR_MARK. In none of these cases may there have previously
8863 been any type specifiers. */
8864 if (specs->type || specs->typespec_word != cts_none
8865 || specs->long_p || specs->short_p || specs->signed_p
8866 || specs->unsigned_p || specs->complex_p)
8867 error_at (loc, "two or more data types in declaration specifiers");
8868 else if (TREE_CODE (type) == TYPE_DECL)
8870 if (TREE_TYPE (type) == error_mark_node)
8871 ; /* Allow the type to default to int to avoid cascading errors. */
8874 specs->type = TREE_TYPE (type);
8875 specs->decl_attr = DECL_ATTRIBUTES (type);
8876 specs->typedef_p = true;
8877 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
8879 /* If this typedef name is defined in a struct, then a C++
8880 lookup would return a different value. */
8882 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
8883 warning_at (loc, OPT_Wc___compat,
8884 "C++ lookup of %qD would return a field, not a type",
8887 /* If we are parsing a struct, record that a struct field
8889 if (warn_cxx_compat && struct_parse_info != NULL)
8890 VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type);
8893 else if (TREE_CODE (type) == IDENTIFIER_NODE)
8895 tree t = lookup_name (type);
8896 if (!t || TREE_CODE (t) != TYPE_DECL)
8897 error_at (loc, "%qE fails to be a typedef or built in type", type);
8898 else if (TREE_TYPE (t) == error_mark_node)
8901 specs->type = TREE_TYPE (t);
8903 else if (TREE_CODE (type) != ERROR_MARK)
8905 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
8906 specs->tag_defined_p = true;
8907 if (spec.kind == ctsk_typeof)
8909 specs->typedef_p = true;
8913 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
8914 specs->expr, spec.expr);
8916 specs->expr = spec.expr;
8917 specs->expr_const_operands &= spec.expr_const_operands;
8926 /* Add the storage class specifier or function specifier SCSPEC to the
8927 declaration specifiers SPECS, returning SPECS. */
8929 struct c_declspecs *
8930 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
8933 enum c_storage_class n = csc_none;
8935 specs->declspecs_seen_p = true;
8936 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
8937 && C_IS_RESERVED_WORD (scspec));
8938 i = C_RID_CODE (scspec);
8939 if (specs->non_sc_seen_p)
8940 warning (OPT_Wold_style_declaration,
8941 "%qE is not at beginning of declaration", scspec);
8945 /* C99 permits duplicate inline. Although of doubtful utility,
8946 it seems simplest to permit it in gnu89 mode as well, as
8947 there is also little utility in maintaining this as a
8948 difference between gnu89 and C99 inline. */
8950 specs->inline_p = true;
8953 dupe = specs->thread_p;
8954 if (specs->storage_class == csc_auto)
8955 error ("%<__thread%> used with %<auto%>");
8956 else if (specs->storage_class == csc_register)
8957 error ("%<__thread%> used with %<register%>");
8958 else if (specs->storage_class == csc_typedef)
8959 error ("%<__thread%> used with %<typedef%>");
8961 specs->thread_p = true;
8968 /* Diagnose "__thread extern". */
8969 if (specs->thread_p)
8970 error ("%<__thread%> before %<extern%>");
8977 /* Diagnose "__thread static". */
8978 if (specs->thread_p)
8979 error ("%<__thread%> before %<static%>");
8987 if (n != csc_none && n == specs->storage_class)
8990 error ("duplicate %qE", scspec);
8993 if (specs->storage_class != csc_none && n != specs->storage_class)
8995 error ("multiple storage classes in declaration specifiers");
8999 specs->storage_class = n;
9000 if (n != csc_extern && n != csc_static && specs->thread_p)
9002 error ("%<__thread%> used with %qE", scspec);
9003 specs->thread_p = false;
9010 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9013 struct c_declspecs *
9014 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
9016 specs->attrs = chainon (attrs, specs->attrs);
9017 specs->declspecs_seen_p = true;
9021 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9022 specifiers with any other type specifier to determine the resulting
9023 type. This is where ISO C checks on complex types are made, since
9024 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9027 struct c_declspecs *
9028 finish_declspecs (struct c_declspecs *specs)
9030 /* If a type was specified as a whole, we have no modifiers and are
9032 if (specs->type != NULL_TREE)
9034 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9035 && !specs->signed_p && !specs->unsigned_p
9036 && !specs->complex_p);
9040 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9041 has been specified, treat it as "int" unless "_Complex" is
9042 present and there are no other specifiers. If we just have
9043 "_Complex", it is equivalent to "_Complex double", but e.g.
9044 "_Complex short" is equivalent to "_Complex short int". */
9045 if (specs->typespec_word == cts_none)
9047 if (specs->saturating_p)
9049 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9050 if (!targetm.fixed_point_supported_p ())
9051 error ("fixed-point types not supported for this target");
9052 specs->typespec_word = cts_fract;
9054 else if (specs->long_p || specs->short_p
9055 || specs->signed_p || specs->unsigned_p)
9057 specs->typespec_word = cts_int;
9059 else if (specs->complex_p)
9061 specs->typespec_word = cts_double;
9062 pedwarn (input_location, OPT_pedantic,
9063 "ISO C does not support plain %<complex%> meaning "
9064 "%<double complex%>");
9068 specs->typespec_word = cts_int;
9069 specs->default_int_p = true;
9070 /* We don't diagnose this here because grokdeclarator will
9071 give more specific diagnostics according to whether it is
9072 a function definition. */
9076 /* If "signed" was specified, record this to distinguish "int" and
9077 "signed int" in the case of a bit-field with
9078 -funsigned-bitfields. */
9079 specs->explicit_signed_p = specs->signed_p;
9081 /* Now compute the actual type. */
9082 switch (specs->typespec_word)
9085 gcc_assert (!specs->long_p && !specs->short_p
9086 && !specs->signed_p && !specs->unsigned_p
9087 && !specs->complex_p);
9088 specs->type = void_type_node;
9091 gcc_assert (!specs->long_p && !specs->short_p
9092 && !specs->signed_p && !specs->unsigned_p
9093 && !specs->complex_p);
9094 specs->type = boolean_type_node;
9097 gcc_assert (!specs->long_p && !specs->short_p);
9098 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9099 if (specs->signed_p)
9100 specs->type = signed_char_type_node;
9101 else if (specs->unsigned_p)
9102 specs->type = unsigned_char_type_node;
9104 specs->type = char_type_node;
9105 if (specs->complex_p)
9107 pedwarn (input_location, OPT_pedantic,
9108 "ISO C does not support complex integer types");
9109 specs->type = build_complex_type (specs->type);
9113 gcc_assert (!(specs->long_p && specs->short_p));
9114 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9115 if (specs->long_long_p)
9116 specs->type = (specs->unsigned_p
9117 ? long_long_unsigned_type_node
9118 : long_long_integer_type_node);
9119 else if (specs->long_p)
9120 specs->type = (specs->unsigned_p
9121 ? long_unsigned_type_node
9122 : long_integer_type_node);
9123 else if (specs->short_p)
9124 specs->type = (specs->unsigned_p
9125 ? short_unsigned_type_node
9126 : short_integer_type_node);
9128 specs->type = (specs->unsigned_p
9129 ? unsigned_type_node
9130 : integer_type_node);
9131 if (specs->complex_p)
9133 pedwarn (input_location, OPT_pedantic,
9134 "ISO C does not support complex integer types");
9135 specs->type = build_complex_type (specs->type);
9139 gcc_assert (!specs->long_p && !specs->short_p
9140 && !specs->signed_p && !specs->unsigned_p);
9141 specs->type = (specs->complex_p
9142 ? complex_float_type_node
9146 gcc_assert (!specs->long_long_p && !specs->short_p
9147 && !specs->signed_p && !specs->unsigned_p);
9150 specs->type = (specs->complex_p
9151 ? complex_long_double_type_node
9152 : long_double_type_node);
9156 specs->type = (specs->complex_p
9157 ? complex_double_type_node
9158 : double_type_node);
9164 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9165 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
9166 if (specs->typespec_word == cts_dfloat32)
9167 specs->type = dfloat32_type_node;
9168 else if (specs->typespec_word == cts_dfloat64)
9169 specs->type = dfloat64_type_node;
9171 specs->type = dfloat128_type_node;
9174 gcc_assert (!specs->complex_p);
9175 if (!targetm.fixed_point_supported_p ())
9176 specs->type = integer_type_node;
9177 else if (specs->saturating_p)
9179 if (specs->long_long_p)
9180 specs->type = specs->unsigned_p
9181 ? sat_unsigned_long_long_fract_type_node
9182 : sat_long_long_fract_type_node;
9183 else if (specs->long_p)
9184 specs->type = specs->unsigned_p
9185 ? sat_unsigned_long_fract_type_node
9186 : sat_long_fract_type_node;
9187 else if (specs->short_p)
9188 specs->type = specs->unsigned_p
9189 ? sat_unsigned_short_fract_type_node
9190 : sat_short_fract_type_node;
9192 specs->type = specs->unsigned_p
9193 ? sat_unsigned_fract_type_node
9194 : sat_fract_type_node;
9198 if (specs->long_long_p)
9199 specs->type = specs->unsigned_p
9200 ? unsigned_long_long_fract_type_node
9201 : long_long_fract_type_node;
9202 else if (specs->long_p)
9203 specs->type = specs->unsigned_p
9204 ? unsigned_long_fract_type_node
9205 : long_fract_type_node;
9206 else if (specs->short_p)
9207 specs->type = specs->unsigned_p
9208 ? unsigned_short_fract_type_node
9209 : short_fract_type_node;
9211 specs->type = specs->unsigned_p
9212 ? unsigned_fract_type_node
9217 gcc_assert (!specs->complex_p);
9218 if (!targetm.fixed_point_supported_p ())
9219 specs->type = integer_type_node;
9220 else if (specs->saturating_p)
9222 if (specs->long_long_p)
9223 specs->type = specs->unsigned_p
9224 ? sat_unsigned_long_long_accum_type_node
9225 : sat_long_long_accum_type_node;
9226 else if (specs->long_p)
9227 specs->type = specs->unsigned_p
9228 ? sat_unsigned_long_accum_type_node
9229 : sat_long_accum_type_node;
9230 else if (specs->short_p)
9231 specs->type = specs->unsigned_p
9232 ? sat_unsigned_short_accum_type_node
9233 : sat_short_accum_type_node;
9235 specs->type = specs->unsigned_p
9236 ? sat_unsigned_accum_type_node
9237 : sat_accum_type_node;
9241 if (specs->long_long_p)
9242 specs->type = specs->unsigned_p
9243 ? unsigned_long_long_accum_type_node
9244 : long_long_accum_type_node;
9245 else if (specs->long_p)
9246 specs->type = specs->unsigned_p
9247 ? unsigned_long_accum_type_node
9248 : long_accum_type_node;
9249 else if (specs->short_p)
9250 specs->type = specs->unsigned_p
9251 ? unsigned_short_accum_type_node
9252 : short_accum_type_node;
9254 specs->type = specs->unsigned_p
9255 ? unsigned_accum_type_node
9266 /* A subroutine of c_write_global_declarations. Perform final processing
9267 on one file scope's declarations (or the external scope's declarations),
9271 c_write_global_declarations_1 (tree globals)
9276 /* Process the decls in the order they were written. */
9277 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9279 /* Check for used but undefined static functions using the C
9280 standard's definition of "used", and set TREE_NO_WARNING so
9281 that check_global_declarations doesn't repeat the check. */
9282 if (TREE_CODE (decl) == FUNCTION_DECL
9283 && DECL_INITIAL (decl) == 0
9284 && DECL_EXTERNAL (decl)
9285 && !TREE_PUBLIC (decl)
9286 && C_DECL_USED (decl))
9288 pedwarn (input_location, 0, "%q+F used but never defined", decl);
9289 TREE_NO_WARNING (decl) = 1;
9292 wrapup_global_declaration_1 (decl);
9298 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9299 reconsider |= wrapup_global_declaration_2 (decl);
9303 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9304 check_global_declaration_1 (decl);
9307 /* A subroutine of c_write_global_declarations Emit debug information for each
9308 of the declarations in GLOBALS. */
9311 c_write_global_declarations_2 (tree globals)
9315 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
9316 debug_hooks->global_decl (decl);
9319 /* Preserve the external declarations scope across a garbage collect. */
9320 static GTY(()) tree ext_block;
9323 c_write_global_declarations (void)
9327 /* We don't want to do this if generating a PCH. */
9331 /* Don't waste time on further processing if -fsyntax-only.
9332 Continue for warning and errors issued during lowering though. */
9333 if (flag_syntax_only)
9336 /* Close the external scope. */
9337 ext_block = pop_scope ();
9339 gcc_assert (!current_scope);
9343 tree tmp = BLOCK_VARS (ext_block);
9345 FILE * stream = dump_begin (TDI_tu, &flags);
9348 dump_node (tmp, flags & ~TDF_SLIM, stream);
9349 dump_end (TDI_tu, stream);
9353 /* Process all file scopes in this compilation, and the external_scope,
9354 through wrapup_global_declarations and check_global_declarations. */
9355 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9356 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
9357 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
9359 /* We're done parsing; proceed to optimize and emit assembly.
9360 FIXME: shouldn't be the front end's responsibility to call this. */
9361 cgraph_finalize_compilation_unit ();
9363 /* After cgraph has had a chance to emit everything that's going to
9364 be emitted, output debug information for globals. */
9365 if (errorcount == 0 && sorrycount == 0)
9367 timevar_push (TV_SYMOUT);
9368 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9369 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
9370 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
9371 timevar_pop (TV_SYMOUT);
9377 #include "gt-c-decl.h"