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 (TREE_CODE (decl) == VAR_DECL
4068 && TREE_STATIC (decl)
4069 && global_bindings_p ())
4070 /* So decl is a global variable. Record the types it uses
4071 so that we can decide later to emit debug info for them. */
4072 record_types_used_by_current_var_decl (decl);
4074 /* If `start_decl' didn't like having an initialization, ignore it now. */
4075 if (init != 0 && DECL_INITIAL (decl) == 0)
4078 /* Don't crash if parm is initialized. */
4079 if (TREE_CODE (decl) == PARM_DECL)
4083 store_init_value (init_loc, decl, init, origtype);
4085 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
4086 || TREE_CODE (decl) == FUNCTION_DECL
4087 || TREE_CODE (decl) == FIELD_DECL))
4088 objc_check_decl (decl);
4090 type = TREE_TYPE (decl);
4092 /* Deduce size of array from initialization, if not already known. */
4093 if (TREE_CODE (type) == ARRAY_TYPE
4094 && TYPE_DOMAIN (type) == 0
4095 && TREE_CODE (decl) != TYPE_DECL)
4098 = (TREE_STATIC (decl)
4099 /* Even if pedantic, an external linkage array
4100 may have incomplete type at first. */
4101 ? pedantic && !TREE_PUBLIC (decl)
4102 : !DECL_EXTERNAL (decl));
4104 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
4107 /* Get the completed type made by complete_array_type. */
4108 type = TREE_TYPE (decl);
4113 error ("initializer fails to determine size of %q+D", decl);
4118 error ("array size missing in %q+D", decl);
4119 /* If a `static' var's size isn't known,
4120 make it extern as well as static, so it does not get
4122 If it is not `static', then do not mark extern;
4123 finish_incomplete_decl will give it a default size
4124 and it will get allocated. */
4125 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4126 DECL_EXTERNAL (decl) = 1;
4130 error ("zero or negative size array %q+D", decl);
4134 /* For global variables, update the copy of the type that
4135 exists in the binding. */
4136 if (TREE_PUBLIC (decl))
4138 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
4139 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
4140 b_ext = b_ext->shadowed;
4144 b_ext->u.type = composite_type (b_ext->u.type, type);
4146 b_ext->u.type = type;
4155 if (DECL_INITIAL (decl))
4156 TREE_TYPE (DECL_INITIAL (decl)) = type;
4158 layout_decl (decl, 0);
4161 if (TREE_CODE (decl) == VAR_DECL)
4163 if (init && TREE_CODE (init) == CONSTRUCTOR)
4164 add_flexible_array_elts_to_size (decl, init);
4166 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
4167 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
4168 layout_decl (decl, 0);
4170 if (DECL_SIZE (decl) == 0
4171 /* Don't give an error if we already gave one earlier. */
4172 && TREE_TYPE (decl) != error_mark_node
4173 && (TREE_STATIC (decl)
4174 /* A static variable with an incomplete type
4175 is an error if it is initialized.
4176 Also if it is not file scope.
4177 Otherwise, let it through, but if it is not `extern'
4178 then it may cause an error message later. */
4179 ? (DECL_INITIAL (decl) != 0
4180 || !DECL_FILE_SCOPE_P (decl))
4181 /* An automatic variable with an incomplete type
4183 : !DECL_EXTERNAL (decl)))
4185 error ("storage size of %q+D isn%'t known", decl);
4186 TREE_TYPE (decl) = error_mark_node;
4189 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4190 && DECL_SIZE (decl) != 0)
4192 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4193 constant_expression_warning (DECL_SIZE (decl));
4196 error ("storage size of %q+D isn%'t constant", decl);
4197 TREE_TYPE (decl) = error_mark_node;
4201 if (TREE_USED (type))
4202 TREE_USED (decl) = 1;
4205 /* If this is a function and an assembler name is specified, reset DECL_RTL
4206 so we can give it its new name. Also, update built_in_decls if it
4207 was a normal built-in. */
4208 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4210 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4211 set_builtin_user_assembler_name (decl, asmspec);
4212 set_user_assembler_name (decl, asmspec);
4215 /* If #pragma weak was used, mark the decl weak now. */
4216 maybe_apply_pragma_weak (decl);
4218 /* Output the assembler code and/or RTL code for variables and functions,
4219 unless the type is an undefined structure or union.
4220 If not, it will get done when the type is completed. */
4222 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4224 /* Determine the ELF visibility. */
4225 if (TREE_PUBLIC (decl))
4226 c_determine_visibility (decl);
4228 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4229 if (c_dialect_objc ())
4230 objc_check_decl (decl);
4234 /* If this is not a static variable, issue a warning.
4235 It doesn't make any sense to give an ASMSPEC for an
4236 ordinary, non-register local variable. Historically,
4237 GCC has accepted -- but ignored -- the ASMSPEC in
4239 if (!DECL_FILE_SCOPE_P (decl)
4240 && TREE_CODE (decl) == VAR_DECL
4241 && !C_DECL_REGISTER (decl)
4242 && !TREE_STATIC (decl))
4243 warning (0, "ignoring asm-specifier for non-static local "
4244 "variable %q+D", decl);
4246 set_user_assembler_name (decl, asmspec);
4249 if (DECL_FILE_SCOPE_P (decl))
4251 if (DECL_INITIAL (decl) == NULL_TREE
4252 || DECL_INITIAL (decl) == error_mark_node)
4253 /* Don't output anything
4254 when a tentative file-scope definition is seen.
4255 But at end of compilation, do output code for them. */
4256 DECL_DEFER_OUTPUT (decl) = 1;
4257 rest_of_decl_compilation (decl, true, 0);
4261 /* In conjunction with an ASMSPEC, the `register'
4262 keyword indicates that we should place the variable
4263 in a particular register. */
4264 if (asmspec && C_DECL_REGISTER (decl))
4266 DECL_HARD_REGISTER (decl) = 1;
4267 /* This cannot be done for a structure with volatile
4268 fields, on which DECL_REGISTER will have been
4270 if (!DECL_REGISTER (decl))
4271 error ("cannot put object with volatile field into register");
4274 if (TREE_CODE (decl) != FUNCTION_DECL)
4276 /* If we're building a variable sized type, and we might be
4277 reachable other than via the top of the current binding
4278 level, then create a new BIND_EXPR so that we deallocate
4279 the object at the right time. */
4280 /* Note that DECL_SIZE can be null due to errors. */
4281 if (DECL_SIZE (decl)
4282 && !TREE_CONSTANT (DECL_SIZE (decl))
4283 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
4286 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
4287 TREE_SIDE_EFFECTS (bind) = 1;
4289 BIND_EXPR_BODY (bind) = push_stmt_list ();
4291 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl),
4297 if (!DECL_FILE_SCOPE_P (decl))
4299 /* Recompute the RTL of a local array now
4300 if it used to be an incomplete type. */
4302 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
4304 /* If we used it already as memory, it must stay in memory. */
4305 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4306 /* If it's still incomplete now, no init will save it. */
4307 if (DECL_SIZE (decl) == 0)
4308 DECL_INITIAL (decl) = 0;
4313 if (TREE_CODE (decl) == TYPE_DECL)
4315 if (!DECL_FILE_SCOPE_P (decl)
4316 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
4317 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl));
4319 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
4322 /* At the end of a declaration, throw away any variable type sizes
4323 of types defined inside that declaration. There is no use
4324 computing them in the following function definition. */
4325 if (current_scope == file_scope)
4326 get_pending_sizes ();
4328 /* Install a cleanup (aka destructor) if one was given. */
4329 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
4331 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
4334 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
4335 tree cleanup_decl = lookup_name (cleanup_id);
4339 /* Build "cleanup(&decl)" for the destructor. */
4340 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
4341 vec = VEC_alloc (tree, gc, 1);
4342 VEC_quick_push (tree, vec, cleanup);
4343 cleanup = build_function_call_vec (DECL_SOURCE_LOCATION (decl),
4344 cleanup_decl, vec, NULL);
4345 VEC_free (tree, gc, vec);
4347 /* Don't warn about decl unused; the cleanup uses it. */
4348 TREE_USED (decl) = 1;
4349 TREE_USED (cleanup_decl) = 1;
4351 push_cleanup (decl, cleanup, false);
4356 && TREE_CODE (decl) == VAR_DECL
4357 && TREE_READONLY (decl)
4358 && !DECL_EXTERNAL (decl)
4359 && DECL_INITIAL (decl) == NULL_TREE)
4360 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
4361 "uninitialized const %qD is invalid in C++", decl);
4364 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4367 grokparm (const struct c_parm *parm)
4369 tree attrs = parm->attrs;
4370 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
4371 NULL, &attrs, NULL, NULL, DEPRECATED_NORMAL);
4373 decl_attributes (&decl, attrs, 0);
4378 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4379 and push that on the current scope. */
4382 push_parm_decl (const struct c_parm *parm)
4384 tree attrs = parm->attrs;
4387 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
4388 &attrs, NULL, NULL, DEPRECATED_NORMAL);
4389 decl_attributes (&decl, attrs, 0);
4391 decl = pushdecl (decl);
4393 finish_decl (decl, input_location, NULL_TREE, NULL_TREE, NULL_TREE);
4396 /* Mark all the parameter declarations to date as forward decls.
4397 Also diagnose use of this extension. */
4400 mark_forward_parm_decls (void)
4402 struct c_binding *b;
4404 if (pedantic && !current_scope->warned_forward_parm_decls)
4406 pedwarn (input_location, OPT_pedantic,
4407 "ISO C forbids forward parameter declarations");
4408 current_scope->warned_forward_parm_decls = true;
4411 for (b = current_scope->bindings; b; b = b->prev)
4412 if (TREE_CODE (b->decl) == PARM_DECL)
4413 TREE_ASM_WRITTEN (b->decl) = 1;
4416 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4417 literal, which may be an incomplete array type completed by the
4418 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4419 literal. NON_CONST is true if the initializers contain something
4420 that cannot occur in a constant expression. */
4423 build_compound_literal (location_t loc, tree type, tree init, bool non_const)
4425 /* We do not use start_decl here because we have a type, not a declarator;
4426 and do not use finish_decl because the decl should be stored inside
4427 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4432 if (type == error_mark_node)
4433 return error_mark_node;
4435 decl = build_decl (loc, VAR_DECL, NULL_TREE, type);
4436 DECL_EXTERNAL (decl) = 0;
4437 TREE_PUBLIC (decl) = 0;
4438 TREE_STATIC (decl) = (current_scope == file_scope);
4439 DECL_CONTEXT (decl) = current_function_decl;
4440 TREE_USED (decl) = 1;
4441 TREE_TYPE (decl) = type;
4442 TREE_READONLY (decl) = TYPE_READONLY (type);
4443 store_init_value (loc, decl, init, NULL_TREE);
4445 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4447 int failure = complete_array_type (&TREE_TYPE (decl),
4448 DECL_INITIAL (decl), true);
4449 gcc_assert (!failure);
4451 type = TREE_TYPE (decl);
4452 TREE_TYPE (DECL_INITIAL (decl)) = type;
4455 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
4456 return error_mark_node;
4458 stmt = build_stmt (DECL_SOURCE_LOCATION (decl), DECL_EXPR, decl);
4459 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
4460 TREE_SIDE_EFFECTS (complit) = 1;
4462 layout_decl (decl, 0);
4464 if (TREE_STATIC (decl))
4466 /* This decl needs a name for the assembler output. */
4467 set_compound_literal_name (decl);
4468 DECL_DEFER_OUTPUT (decl) = 1;
4469 DECL_COMDAT (decl) = 1;
4470 DECL_ARTIFICIAL (decl) = 1;
4471 DECL_IGNORED_P (decl) = 1;
4473 rest_of_decl_compilation (decl, 1, 0);
4478 complit = build2 (C_MAYBE_CONST_EXPR, type, NULL, complit);
4479 C_MAYBE_CONST_EXPR_NON_CONST (complit) = 1;
4485 /* Check the type of a compound literal. Here we just check that it
4486 is valid for C++. */
4489 check_compound_literal_type (location_t loc, struct c_type_name *type_name)
4491 if (warn_cxx_compat && type_name->specs->tag_defined_p)
4492 warning_at (loc, OPT_Wc___compat,
4493 "defining a type in a compound literal is invalid in C++");
4496 /* Determine whether TYPE is a structure with a flexible array member,
4497 or a union containing such a structure (possibly recursively). */
4500 flexible_array_type_p (tree type)
4503 switch (TREE_CODE (type))
4506 x = TYPE_FIELDS (type);
4509 while (TREE_CHAIN (x) != NULL_TREE)
4511 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4512 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4513 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4514 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4518 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
4520 if (flexible_array_type_p (TREE_TYPE (x)))
4529 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4530 replacing with appropriate values if they are invalid. */
4532 check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
4535 unsigned int max_width;
4536 unsigned HOST_WIDE_INT w;
4537 const char *name = (orig_name
4538 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name))
4539 : _("<anonymous>"));
4541 /* Detect and ignore out of range field width and process valid
4543 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
4544 || TREE_CODE (*width) != INTEGER_CST)
4546 error ("bit-field %qs width not an integer constant", name);
4547 *width = integer_one_node;
4551 constant_expression_warning (*width);
4552 if (tree_int_cst_sgn (*width) < 0)
4554 error ("negative width in bit-field %qs", name);
4555 *width = integer_one_node;
4557 else if (integer_zerop (*width) && orig_name)
4559 error ("zero width for bit-field %qs", name);
4560 *width = integer_one_node;
4564 /* Detect invalid bit-field type. */
4565 if (TREE_CODE (*type) != INTEGER_TYPE
4566 && TREE_CODE (*type) != BOOLEAN_TYPE
4567 && TREE_CODE (*type) != ENUMERAL_TYPE)
4569 error ("bit-field %qs has invalid type", name);
4570 *type = unsigned_type_node;
4573 type_mv = TYPE_MAIN_VARIANT (*type);
4574 if (!in_system_header
4575 && type_mv != integer_type_node
4576 && type_mv != unsigned_type_node
4577 && type_mv != boolean_type_node)
4578 pedwarn (input_location, OPT_pedantic,
4579 "type of bit-field %qs is a GCC extension", name);
4581 max_width = TYPE_PRECISION (*type);
4583 if (0 < compare_tree_int (*width, max_width))
4585 error ("width of %qs exceeds its type", name);
4587 *width = build_int_cst (NULL_TREE, w);
4590 w = tree_low_cst (*width, 1);
4592 if (TREE_CODE (*type) == ENUMERAL_TYPE)
4594 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
4596 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
4597 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
4598 warning (0, "%qs is narrower than values of its type", name);
4604 /* Print warning about variable length array if necessary. */
4607 warn_variable_length_array (tree name, tree size)
4609 int const_size = TREE_CONSTANT (size);
4611 if (!flag_isoc99 && pedantic && warn_vla != 0)
4616 pedwarn (input_location, OPT_Wvla,
4617 "ISO C90 forbids array %qE whose size "
4618 "can%'t be evaluated",
4621 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
4622 "can%'t be evaluated");
4627 pedwarn (input_location, OPT_Wvla,
4628 "ISO C90 forbids variable length array %qE",
4631 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
4634 else if (warn_vla > 0)
4640 "the size of array %qE can"
4641 "%'t be evaluated", name);
4644 "the size of array can %'t be evaluated");
4650 "variable length array %qE is used",
4654 "variable length array is used");
4659 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4660 serve as the actual size-expression for a type or decl. This is
4661 like variable_size in stor-layout.c, but we make global_bindings_p
4662 return negative to avoid calls to that function from outside the
4663 front end resulting in errors at file scope, then call this version
4664 instead from front-end code. */
4667 c_variable_size (tree size)
4671 if (TREE_CONSTANT (size))
4674 size = save_expr (size);
4676 save = skip_simple_arithmetic (size);
4678 if (cfun && cfun->dont_save_pending_sizes_p)
4681 if (!global_bindings_p ())
4682 put_pending_size (save);
4687 /* Given declspecs and a declarator,
4688 determine the name and type of the object declared
4689 and construct a ..._DECL node for it.
4690 (In one case we can return a ..._TYPE node instead.
4691 For invalid input we sometimes return 0.)
4693 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4695 DECL_CONTEXT says which syntactic context this declaration is in:
4696 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4697 FUNCDEF for a function definition. Like NORMAL but a few different
4698 error messages in each case. Return value may be zero meaning
4699 this definition is too screwy to try to parse.
4700 PARM for a parameter declaration (either within a function prototype
4701 or before a function body). Make a PARM_DECL, or return void_type_node.
4702 TYPENAME if for a typename (in a cast or sizeof).
4703 Don't make a DECL node; just return the ..._TYPE node.
4704 FIELD for a struct or union field; make a FIELD_DECL.
4705 INITIALIZED is true if the decl has an initializer.
4706 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4707 representing the width of the bit-field.
4708 DECL_ATTRS points to the list of attributes that should be added to this
4709 decl. Any nested attributes that belong on the decl itself will be
4711 If EXPR is not NULL, any expressions that need to be evaluated as
4712 part of evaluating variably modified types will be stored in *EXPR.
4713 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4714 set to indicate whether operands in *EXPR can be used in constant
4716 DEPRECATED_STATE is a deprecated_states value indicating whether
4717 deprecation warnings should be suppressed.
4719 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4720 It may also be so in the PARM case, for a prototype where the
4721 argument type is specified but not the name.
4723 This function is where the complicated C meanings of `static'
4724 and `extern' are interpreted. */
4727 grokdeclarator (const struct c_declarator *declarator,
4728 struct c_declspecs *declspecs,
4729 enum decl_context decl_context, bool initialized, tree *width,
4730 tree *decl_attrs, tree *expr, bool *expr_const_operands,
4731 enum deprecated_states deprecated_state)
4733 tree type = declspecs->type;
4734 bool threadp = declspecs->thread_p;
4735 enum c_storage_class storage_class = declspecs->storage_class;
4739 int type_quals = TYPE_UNQUALIFIED;
4740 tree name = NULL_TREE;
4741 bool funcdef_flag = false;
4742 bool funcdef_syntax = false;
4743 bool size_varies = false;
4744 tree decl_attr = declspecs->decl_attr;
4745 int array_ptr_quals = TYPE_UNQUALIFIED;
4746 tree array_ptr_attrs = NULL_TREE;
4747 int array_parm_static = 0;
4748 bool array_parm_vla_unspec_p = false;
4749 tree returned_attrs = NULL_TREE;
4750 bool bitfield = width != NULL;
4752 struct c_arg_info *arg_info = 0;
4753 location_t loc = UNKNOWN_LOCATION;
4756 bool expr_const_operands_dummy;
4760 if (expr_const_operands == NULL)
4761 expr_const_operands = &expr_const_operands_dummy;
4763 *expr = declspecs->expr;
4764 *expr_const_operands = declspecs->expr_const_operands;
4766 if (decl_context == FUNCDEF)
4767 funcdef_flag = true, decl_context = NORMAL;
4769 /* Look inside a declarator for the name being declared
4770 and get it as an IDENTIFIER_NODE, for an error message. */
4772 const struct c_declarator *decl = declarator;
4783 funcdef_syntax = (decl->kind == cdk_function);
4784 decl = decl->declarator;
4788 decl = decl->declarator;
4803 gcc_assert (decl_context == PARM
4804 || decl_context == TYPENAME
4805 || (decl_context == FIELD
4806 && declarator->kind == cdk_id));
4807 gcc_assert (!initialized);
4811 /* A function definition's declarator must have the form of
4812 a function declarator. */
4814 if (funcdef_flag && !funcdef_syntax)
4817 /* If this looks like a function definition, make it one,
4818 even if it occurs where parms are expected.
4819 Then store_parm_decls will reject it and not use it as a parm. */
4820 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4821 decl_context = PARM;
4823 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4824 warn_deprecated_use (declspecs->type, declspecs->decl_attr);
4826 if ((decl_context == NORMAL || decl_context == FIELD)
4827 && current_scope == file_scope
4828 && variably_modified_type_p (type, NULL_TREE))
4831 error_at (loc, "variably modified %qE at file scope", name);
4833 error_at (loc, "variably modified field at file scope");
4834 type = integer_type_node;
4837 size_varies = C_TYPE_VARIABLE_SIZE (type) != 0;
4839 /* Diagnose defaulting to "int". */
4841 if (declspecs->default_int_p && !in_system_header)
4843 /* Issue a warning if this is an ISO C 99 program or if
4844 -Wreturn-type and this is a function, or if -Wimplicit;
4845 prefer the former warning since it is more explicit. */
4846 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4848 warn_about_return_type = 1;
4852 pedwarn_c99 (loc, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4853 "type defaults to %<int%> in declaration of %qE",
4856 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4857 "type defaults to %<int%> in type name");
4861 /* Adjust the type if a bit-field is being declared,
4862 -funsigned-bitfields applied and the type is not explicitly
4864 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4865 && TREE_CODE (type) == INTEGER_TYPE)
4866 type = unsigned_type_for (type);
4868 /* Figure out the type qualifiers for the declaration. There are
4869 two ways a declaration can become qualified. One is something
4870 like `const int i' where the `const' is explicit. Another is
4871 something like `typedef const int CI; CI i' where the type of the
4872 declaration contains the `const'. A third possibility is that
4873 there is a type qualifier on the element type of a typedefed
4874 array type, in which case we should extract that qualifier so
4875 that c_apply_type_quals_to_decl receives the full list of
4876 qualifiers to work with (C90 is not entirely clear about whether
4877 duplicate qualifiers should be diagnosed in this case, but it
4878 seems most appropriate to do so). */
4879 element_type = strip_array_types (type);
4880 constp = declspecs->const_p + TYPE_READONLY (element_type);
4881 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4882 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4883 if (pedantic && !flag_isoc99)
4886 pedwarn (loc, OPT_pedantic, "duplicate %<const%>");
4888 pedwarn (loc, OPT_pedantic, "duplicate %<restrict%>");
4890 pedwarn (loc, OPT_pedantic, "duplicate %<volatile%>");
4892 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4893 type = TYPE_MAIN_VARIANT (type);
4894 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4895 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4896 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4898 /* Warn about storage classes that are invalid for certain
4899 kinds of declarations (parameters, typenames, etc.). */
4903 || storage_class == csc_auto
4904 || storage_class == csc_register
4905 || storage_class == csc_typedef))
4907 if (storage_class == csc_auto)
4909 (current_scope == file_scope) ? 0 : OPT_pedantic,
4910 "function definition declared %<auto%>");
4911 if (storage_class == csc_register)
4912 error_at (loc, "function definition declared %<register%>");
4913 if (storage_class == csc_typedef)
4914 error_at (loc, "function definition declared %<typedef%>");
4916 error_at (loc, "function definition declared %<__thread%>");
4918 if (storage_class == csc_auto
4919 || storage_class == csc_register
4920 || storage_class == csc_typedef)
4921 storage_class = csc_none;
4923 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4925 if (decl_context == PARM && storage_class == csc_register)
4929 switch (decl_context)
4933 error_at (loc, "storage class specified for structure "
4936 error_at (loc, "storage class specified for structure field");
4940 error_at (loc, "storage class specified for parameter %qE",
4943 error_at (loc, "storage class specified for unnamed parameter");
4946 error_at (loc, "storage class specified for typename");
4949 storage_class = csc_none;
4953 else if (storage_class == csc_extern
4957 /* 'extern' with initialization is invalid if not at file scope. */
4958 if (current_scope == file_scope)
4960 /* It is fine to have 'extern const' when compiling at C
4961 and C++ intersection. */
4962 if (!(warn_cxx_compat && constp))
4963 warning_at (loc, 0, "%qE initialized and declared %<extern%>",
4967 error_at (loc, "%qE has both %<extern%> and initializer", name);
4969 else if (current_scope == file_scope)
4971 if (storage_class == csc_auto)
4972 error_at (loc, "file-scope declaration of %qE specifies %<auto%>",
4974 if (pedantic && storage_class == csc_register)
4975 pedwarn (input_location, OPT_pedantic,
4976 "file-scope declaration of %qE specifies %<register%>", name);
4980 if (storage_class == csc_extern && funcdef_flag)
4981 error_at (loc, "nested function %qE declared %<extern%>", name);
4982 else if (threadp && storage_class == csc_none)
4984 error_at (loc, "function-scope %qE implicitly auto and declared "
4991 /* Now figure out the structure of the declarator proper.
4992 Descend through it, creating more complex types, until we reach
4993 the declared identifier (or NULL_TREE, in an absolute declarator).
4994 At each stage we maintain an unqualified version of the type
4995 together with any qualifiers that should be applied to it with
4996 c_build_qualified_type; this way, array types including
4997 multidimensional array types are first built up in unqualified
4998 form and then the qualified form is created with
4999 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5001 while (declarator && declarator->kind != cdk_id)
5003 if (type == error_mark_node)
5005 declarator = declarator->declarator;
5009 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5010 a cdk_pointer (for *...),
5011 a cdk_function (for ...(...)),
5012 a cdk_attrs (for nested attributes),
5013 or a cdk_id (for the name being declared
5014 or the place in an absolute declarator
5015 where the name was omitted).
5016 For the last case, we have just exited the loop.
5018 At this point, TYPE is the type of elements of an array,
5019 or for a function to return, or for a pointer to point to.
5020 After this sequence of ifs, TYPE is the type of the
5021 array or function or pointer, and DECLARATOR has had its
5022 outermost layer removed. */
5024 if (array_ptr_quals != TYPE_UNQUALIFIED
5025 || array_ptr_attrs != NULL_TREE
5026 || array_parm_static)
5028 /* Only the innermost declarator (making a parameter be of
5029 array type which is converted to pointer type)
5030 may have static or type qualifiers. */
5031 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5032 array_ptr_quals = TYPE_UNQUALIFIED;
5033 array_ptr_attrs = NULL_TREE;
5034 array_parm_static = 0;
5037 switch (declarator->kind)
5041 /* A declarator with embedded attributes. */
5042 tree attrs = declarator->u.attrs;
5043 const struct c_declarator *inner_decl;
5045 declarator = declarator->declarator;
5046 inner_decl = declarator;
5047 while (inner_decl->kind == cdk_attrs)
5048 inner_decl = inner_decl->declarator;
5049 if (inner_decl->kind == cdk_id)
5050 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
5051 else if (inner_decl->kind == cdk_function)
5052 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
5053 else if (inner_decl->kind == cdk_array)
5054 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
5055 returned_attrs = decl_attributes (&type,
5056 chainon (returned_attrs, attrs),
5062 tree itype = NULL_TREE;
5063 tree size = declarator->u.array.dimen;
5064 /* The index is a signed object `sizetype' bits wide. */
5065 tree index_type = c_common_signed_type (sizetype);
5067 array_ptr_quals = declarator->u.array.quals;
5068 array_ptr_attrs = declarator->u.array.attrs;
5069 array_parm_static = declarator->u.array.static_p;
5070 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
5072 declarator = declarator->declarator;
5074 /* Check for some types that there cannot be arrays of. */
5076 if (VOID_TYPE_P (type))
5079 error_at (loc, "declaration of %qE as array of voids", name);
5081 error_at (loc, "declaration of type name as array of voids");
5082 type = error_mark_node;
5085 if (TREE_CODE (type) == FUNCTION_TYPE)
5088 error_at (loc, "declaration of %qE as array of functions",
5091 error_at (loc, "declaration of type name as array of "
5093 type = error_mark_node;
5096 if (pedantic && !in_system_header && flexible_array_type_p (type))
5097 pedwarn (loc, OPT_pedantic,
5098 "invalid use of structure with flexible array member");
5100 if (size == error_mark_node)
5101 type = error_mark_node;
5103 if (type == error_mark_node)
5106 /* If size was specified, set ITYPE to a range-type for
5107 that size. Otherwise, ITYPE remains null. finish_decl
5108 may figure it out from an initial value. */
5112 bool size_maybe_const = true;
5113 bool size_int_const = (TREE_CODE (size) == INTEGER_CST
5114 && !TREE_OVERFLOW (size));
5115 bool this_size_varies = false;
5117 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5119 STRIP_TYPE_NOPS (size);
5121 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
5124 error_at (loc, "size of array %qE has non-integer type",
5128 "size of unnamed array has non-integer type");
5129 size = integer_one_node;
5132 size = c_fully_fold (size, false, &size_maybe_const);
5134 if (pedantic && size_maybe_const && integer_zerop (size))
5137 pedwarn (loc, OPT_pedantic,
5138 "ISO C forbids zero-size array %qE", name);
5140 pedwarn (loc, OPT_pedantic,
5141 "ISO C forbids zero-size array");
5144 if (TREE_CODE (size) == INTEGER_CST && size_maybe_const)
5146 constant_expression_warning (size);
5147 if (tree_int_cst_sgn (size) < 0)
5150 error_at (loc, "size of array %qE is negative", name);
5152 error_at (loc, "size of unnamed array is negative");
5153 size = integer_one_node;
5155 /* Handle a size folded to an integer constant but
5156 not an integer constant expression. */
5157 if (!size_int_const)
5159 /* If this is a file scope declaration of an
5160 ordinary identifier, this is invalid code;
5161 diagnosing it here and not subsequently
5162 treating the type as variable-length avoids
5163 more confusing diagnostics later. */
5164 if ((decl_context == NORMAL || decl_context == FIELD)
5165 && current_scope == file_scope)
5166 pedwarn (input_location, 0,
5167 "variably modified %qE at file scope",
5170 this_size_varies = size_varies = true;
5171 warn_variable_length_array (name, size);
5174 else if ((decl_context == NORMAL || decl_context == FIELD)
5175 && current_scope == file_scope)
5177 error_at (loc, "variably modified %qE at file scope", name);
5178 size = integer_one_node;
5182 /* Make sure the array size remains visibly
5183 nonconstant even if it is (eg) a const variable
5184 with known value. */
5185 this_size_varies = size_varies = true;
5186 warn_variable_length_array (name, size);
5189 if (integer_zerop (size) && !this_size_varies)
5191 /* A zero-length array cannot be represented with
5192 an unsigned index type, which is what we'll
5193 get with build_index_type. Create an
5194 open-ended range instead. */
5195 itype = build_range_type (sizetype, size, NULL_TREE);
5199 /* Arrange for the SAVE_EXPR on the inside of the
5200 MINUS_EXPR, which allows the -1 to get folded
5201 with the +1 that happens when building TYPE_SIZE. */
5203 size = c_variable_size (size);
5204 if (this_size_varies && TREE_CODE (size) == INTEGER_CST)
5205 size = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5206 integer_zero_node, size);
5208 /* Compute the maximum valid index, that is, size
5209 - 1. Do the calculation in index_type, so that
5210 if it is a variable the computations will be
5211 done in the proper mode. */
5212 itype = fold_build2_loc (loc, MINUS_EXPR, index_type,
5213 convert (index_type, size),
5214 convert (index_type,
5217 /* If that overflowed, the array is too big. ???
5218 While a size of INT_MAX+1 technically shouldn't
5219 cause an overflow (because we subtract 1), the
5220 overflow is recorded during the conversion to
5221 index_type, before the subtraction. Handling
5222 this case seems like an unnecessary
5224 if (TREE_CODE (itype) == INTEGER_CST
5225 && TREE_OVERFLOW (itype))
5228 error_at (loc, "size of array %qE is too large",
5231 error_at (loc, "size of unnamed array is too large");
5232 type = error_mark_node;
5236 itype = build_index_type (itype);
5238 if (this_size_varies)
5241 *expr = build2 (COMPOUND_EXPR, TREE_TYPE (size),
5245 *expr_const_operands &= size_maybe_const;
5248 else if (decl_context == FIELD)
5250 bool flexible_array_member = false;
5251 if (array_parm_vla_unspec_p)
5252 /* Field names can in fact have function prototype
5253 scope so [*] is disallowed here through making
5254 the field variably modified, not through being
5255 something other than a declaration with function
5260 const struct c_declarator *t = declarator;
5261 while (t->kind == cdk_attrs)
5263 flexible_array_member = (t->kind == cdk_id);
5265 if (flexible_array_member
5266 && pedantic && !flag_isoc99 && !in_system_header)
5267 pedwarn (loc, OPT_pedantic,
5268 "ISO C90 does not support flexible array members");
5270 /* ISO C99 Flexible array members are effectively
5271 identical to GCC's zero-length array extension. */
5272 if (flexible_array_member || array_parm_vla_unspec_p)
5273 itype = build_range_type (sizetype, size_zero_node,
5276 else if (decl_context == PARM)
5278 if (array_parm_vla_unspec_p)
5280 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
5284 else if (decl_context == TYPENAME)
5286 if (array_parm_vla_unspec_p)
5289 warning (0, "%<[*]%> not in a declaration");
5290 /* We use this to avoid messing up with incomplete
5291 array types of the same type, that would
5292 otherwise be modified below. */
5293 itype = build_range_type (sizetype, size_zero_node,
5299 /* Complain about arrays of incomplete types. */
5300 if (!COMPLETE_TYPE_P (type))
5302 error_at (loc, "array type has incomplete element type");
5303 type = error_mark_node;
5306 /* When itype is NULL, a shared incomplete array type is
5307 returned for all array of a given type. Elsewhere we
5308 make sure we don't complete that type before copying
5309 it, but here we want to make sure we don't ever
5310 modify the shared type, so we gcc_assert (itype)
5312 type = build_array_type (type, itype);
5314 if (type != error_mark_node)
5318 /* It is ok to modify type here even if itype is
5319 NULL: if size_varies, we're in a
5320 multi-dimensional array and the inner type has
5321 variable size, so the enclosing shared array type
5323 if (size && TREE_CODE (size) == INTEGER_CST)
5325 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5326 C_TYPE_VARIABLE_SIZE (type) = 1;
5329 /* The GCC extension for zero-length arrays differs from
5330 ISO flexible array members in that sizeof yields
5332 if (size && integer_zerop (size))
5335 TYPE_SIZE (type) = bitsize_zero_node;
5336 TYPE_SIZE_UNIT (type) = size_zero_node;
5338 if (array_parm_vla_unspec_p)
5341 /* The type is complete. C99 6.7.5.2p4 */
5342 TYPE_SIZE (type) = bitsize_zero_node;
5343 TYPE_SIZE_UNIT (type) = size_zero_node;
5347 if (decl_context != PARM
5348 && (array_ptr_quals != TYPE_UNQUALIFIED
5349 || array_ptr_attrs != NULL_TREE
5350 || array_parm_static))
5352 error_at (loc, "static or type qualifiers in non-parameter array declarator");
5353 array_ptr_quals = TYPE_UNQUALIFIED;
5354 array_ptr_attrs = NULL_TREE;
5355 array_parm_static = 0;
5361 /* Say it's a definition only for the declarator closest
5362 to the identifier, apart possibly from some
5364 bool really_funcdef = false;
5368 const struct c_declarator *t = declarator->declarator;
5369 while (t->kind == cdk_attrs)
5371 really_funcdef = (t->kind == cdk_id);
5374 /* Declaring a function type. Make sure we have a valid
5375 type for the function to return. */
5376 if (type == error_mark_node)
5379 size_varies = false;
5381 /* Warn about some types functions can't return. */
5382 if (TREE_CODE (type) == FUNCTION_TYPE)
5385 error_at (loc, "%qE declared as function returning a "
5388 error_at (loc, "type name declared as function "
5389 "returning a function");
5390 type = integer_type_node;
5392 if (TREE_CODE (type) == ARRAY_TYPE)
5395 error_at (loc, "%qE declared as function returning an array",
5398 error_at (loc, "type name declared as function returning "
5400 type = integer_type_node;
5402 errmsg = targetm.invalid_return_type (type);
5406 type = integer_type_node;
5409 /* Construct the function type and go to the next
5410 inner layer of declarator. */
5411 arg_info = declarator->u.arg_info;
5412 arg_types = grokparms (arg_info, really_funcdef);
5414 put_pending_sizes (arg_info->pending_sizes);
5416 /* Type qualifiers before the return type of the function
5417 qualify the return type, not the function type. */
5420 /* Type qualifiers on a function return type are
5421 normally permitted by the standard but have no
5422 effect, so give a warning at -Wreturn-type.
5423 Qualifiers on a void return type are banned on
5424 function definitions in ISO C; GCC used to used
5425 them for noreturn functions. */
5426 if (VOID_TYPE_P (type) && really_funcdef)
5428 "function definition has qualified void return type");
5430 warning_at (loc, OPT_Wignored_qualifiers,
5431 "type qualifiers ignored on function return type");
5433 type = c_build_qualified_type (type, type_quals);
5435 type_quals = TYPE_UNQUALIFIED;
5437 type = build_function_type (type, arg_types);
5438 declarator = declarator->declarator;
5440 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5441 the formal parameter list of this FUNCTION_TYPE to point to
5442 the FUNCTION_TYPE node itself. */
5446 for (link = arg_info->tags;
5448 link = TREE_CHAIN (link))
5449 TYPE_CONTEXT (TREE_VALUE (link)) = type;
5455 /* Merge any constancy or volatility into the target type
5458 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5460 pedwarn (loc, OPT_pedantic,
5461 "ISO C forbids qualified function types");
5463 type = c_build_qualified_type (type, type_quals);
5464 size_varies = false;
5466 /* When the pointed-to type involves components of variable size,
5467 care must be taken to ensure that the size evaluation code is
5468 emitted early enough to dominate all the possible later uses
5469 and late enough for the variables on which it depends to have
5472 This is expected to happen automatically when the pointed-to
5473 type has a name/declaration of it's own, but special attention
5474 is required if the type is anonymous.
5476 We handle the NORMAL and FIELD contexts here by attaching an
5477 artificial TYPE_DECL to such pointed-to type. This forces the
5478 sizes evaluation at a safe point and ensures it is not deferred
5479 until e.g. within a deeper conditional context.
5481 We expect nothing to be needed here for PARM or TYPENAME.
5482 Pushing a TYPE_DECL at this point for TYPENAME would actually
5483 be incorrect, as we might be in the middle of an expression
5484 with side effects on the pointed-to type size "arguments" prior
5485 to the pointer declaration point and the fake TYPE_DECL in the
5486 enclosing context would force the size evaluation prior to the
5489 if (!TYPE_NAME (type)
5490 && (decl_context == NORMAL || decl_context == FIELD)
5491 && variably_modified_type_p (type, NULL_TREE))
5493 tree decl = build_decl (loc, TYPE_DECL, NULL_TREE, type);
5494 DECL_ARTIFICIAL (decl) = 1;
5496 finish_decl (decl, loc, NULL_TREE, NULL_TREE, NULL_TREE);
5497 TYPE_NAME (type) = decl;
5500 type = build_pointer_type (type);
5502 /* Process type qualifiers (such as const or volatile)
5503 that were given inside the `*'. */
5504 type_quals = declarator->u.pointer_quals;
5506 declarator = declarator->declarator;
5513 *decl_attrs = chainon (returned_attrs, *decl_attrs);
5515 /* Now TYPE has the actual type, apart from any qualifiers in
5518 /* Check the type and width of a bit-field. */
5520 check_bitfield_type_and_width (&type, width, name);
5522 /* Did array size calculations overflow? */
5524 if (TREE_CODE (type) == ARRAY_TYPE
5525 && COMPLETE_TYPE_P (type)
5526 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
5527 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
5530 error_at (loc, "size of array %qE is too large", name);
5532 error_at (loc, "size of unnamed array is too large");
5533 /* If we proceed with the array type as it is, we'll eventually
5534 crash in tree_low_cst(). */
5535 type = error_mark_node;
5538 /* If this is declaring a typedef name, return a TYPE_DECL. */
5540 if (storage_class == csc_typedef)
5543 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5545 pedwarn (loc, OPT_pedantic,
5546 "ISO C forbids qualified function types");
5548 type = c_build_qualified_type (type, type_quals);
5549 decl = build_decl (declarator->id_loc,
5550 TYPE_DECL, declarator->u.id, type);
5551 if (declspecs->explicit_signed_p)
5552 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5553 if (declspecs->inline_p)
5554 pedwarn (loc, 0,"typedef %q+D declared %<inline%>", decl);
5556 if (warn_cxx_compat && declarator->u.id != NULL_TREE)
5558 struct c_binding *b = I_TAG_BINDING (declarator->u.id);
5561 && b->decl != NULL_TREE
5562 && (B_IN_CURRENT_SCOPE (b)
5563 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
5564 && TYPE_MAIN_VARIANT (b->decl) != TYPE_MAIN_VARIANT (type))
5566 warning_at (declarator->id_loc, OPT_Wc___compat,
5567 ("using %qD as both a typedef and a tag is "
5570 if (b->locus != UNKNOWN_LOCATION)
5571 inform (b->locus, "originally defined here");
5578 /* If this is a type name (such as, in a cast or sizeof),
5579 compute the type and return it now. */
5581 if (decl_context == TYPENAME)
5583 /* Note that the grammar rejects storage classes in typenames
5585 gcc_assert (storage_class == csc_none && !threadp
5586 && !declspecs->inline_p);
5587 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5589 pedwarn (loc, OPT_pedantic,
5590 "ISO C forbids const or volatile function types");
5592 type = c_build_qualified_type (type, type_quals);
5596 if (pedantic && decl_context == FIELD
5597 && variably_modified_type_p (type, NULL_TREE))
5600 pedwarn (loc, OPT_pedantic, "a member of a structure or union cannot "
5601 "have a variably modified type");
5604 /* Aside from typedefs and type names (handle above),
5605 `void' at top level (not within pointer)
5606 is allowed only in public variables.
5607 We don't complain about parms either, but that is because
5608 a better error message can be made later. */
5610 if (VOID_TYPE_P (type) && decl_context != PARM
5611 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5612 && (storage_class == csc_extern
5613 || (current_scope == file_scope
5614 && !(storage_class == csc_static
5615 || storage_class == csc_register)))))
5617 error_at (loc, "variable or field %qE declared void", name);
5618 type = integer_type_node;
5621 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5622 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5627 if (decl_context == PARM)
5631 /* A parameter declared as an array of T is really a pointer to T.
5632 One declared as a function is really a pointer to a function. */
5634 if (TREE_CODE (type) == ARRAY_TYPE)
5636 /* Transfer const-ness of array into that of type pointed to. */
5637 type = TREE_TYPE (type);
5639 type = c_build_qualified_type (type, type_quals);
5640 type = build_pointer_type (type);
5641 type_quals = array_ptr_quals;
5643 type = c_build_qualified_type (type, type_quals);
5645 /* We don't yet implement attributes in this context. */
5646 if (array_ptr_attrs != NULL_TREE)
5647 warning_at (loc, OPT_Wattributes,
5648 "attributes in parameter array declarator ignored");
5650 size_varies = false;
5652 else if (TREE_CODE (type) == FUNCTION_TYPE)
5655 pedwarn (loc, OPT_pedantic,
5656 "ISO C forbids qualified function types");
5658 type = c_build_qualified_type (type, type_quals);
5659 type = build_pointer_type (type);
5660 type_quals = TYPE_UNQUALIFIED;
5662 else if (type_quals)
5663 type = c_build_qualified_type (type, type_quals);
5665 decl = build_decl (declarator->id_loc,
5666 PARM_DECL, declarator->u.id, type);
5668 C_DECL_VARIABLE_SIZE (decl) = 1;
5670 /* Compute the type actually passed in the parmlist,
5671 for the case where there is no prototype.
5672 (For example, shorts and chars are passed as ints.)
5673 When there is a prototype, this is overridden later. */
5675 if (type == error_mark_node)
5676 promoted_type = type;
5678 promoted_type = c_type_promotes_to (type);
5680 DECL_ARG_TYPE (decl) = promoted_type;
5681 if (declspecs->inline_p)
5682 pedwarn (loc, 0, "parameter %q+D declared %<inline%>", decl);
5684 else if (decl_context == FIELD)
5686 /* Note that the grammar rejects storage classes in typenames
5688 gcc_assert (storage_class == csc_none && !threadp
5689 && !declspecs->inline_p);
5691 /* Structure field. It may not be a function. */
5693 if (TREE_CODE (type) == FUNCTION_TYPE)
5695 error_at (loc, "field %qE declared as a function", name);
5696 type = build_pointer_type (type);
5698 else if (TREE_CODE (type) != ERROR_MARK
5699 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
5702 error_at (loc, "field %qE has incomplete type", name);
5704 error_at (loc, "unnamed field has incomplete type");
5705 type = error_mark_node;
5707 type = c_build_qualified_type (type, type_quals);
5708 decl = build_decl (declarator->id_loc,
5709 FIELD_DECL, declarator->u.id, type);
5710 DECL_NONADDRESSABLE_P (decl) = bitfield;
5711 if (bitfield && !declarator->u.id)
5712 TREE_NO_WARNING (decl) = 1;
5715 C_DECL_VARIABLE_SIZE (decl) = 1;
5717 else if (TREE_CODE (type) == FUNCTION_TYPE)
5719 if (storage_class == csc_register || threadp)
5721 error_at (loc, "invalid storage class for function %qE", name);
5723 else if (current_scope != file_scope)
5725 /* Function declaration not at file scope. Storage
5726 classes other than `extern' are not allowed, C99
5727 6.7.1p5, and `extern' makes no difference. However,
5728 GCC allows 'auto', perhaps with 'inline', to support
5729 nested functions. */
5730 if (storage_class == csc_auto)
5731 pedwarn (loc, OPT_pedantic,
5732 "invalid storage class for function %qE", name);
5733 else if (storage_class == csc_static)
5735 error_at (loc, "invalid storage class for function %qE", name);
5737 storage_class = declspecs->storage_class = csc_none;
5743 decl = build_decl (declarator->id_loc,
5744 FUNCTION_DECL, declarator->u.id, type);
5745 decl = build_decl_attribute_variant (decl, decl_attr);
5747 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
5748 pedwarn (loc, OPT_pedantic,
5749 "ISO C forbids qualified function types");
5751 /* GNU C interprets a volatile-qualified function type to indicate
5752 that the function does not return. */
5753 if ((type_quals & TYPE_QUAL_VOLATILE)
5754 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
5755 warning_at (loc, 0, "%<noreturn%> function returns non-void value");
5757 /* Every function declaration is an external reference
5758 (DECL_EXTERNAL) except for those which are not at file
5759 scope and are explicitly declared "auto". This is
5760 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5761 GCC to signify a forward declaration of a nested function. */
5762 if (storage_class == csc_auto && current_scope != file_scope)
5763 DECL_EXTERNAL (decl) = 0;
5764 /* In C99, a function which is declared 'inline' with 'extern'
5765 is not an external reference (which is confusing). It
5766 means that the later definition of the function must be output
5767 in this file, C99 6.7.4p6. In GNU C89, a function declared
5768 'extern inline' is an external reference. */
5769 else if (declspecs->inline_p && storage_class != csc_static)
5770 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
5771 == flag_gnu89_inline);
5773 DECL_EXTERNAL (decl) = !initialized;
5775 /* Record absence of global scope for `static' or `auto'. */
5777 = !(storage_class == csc_static || storage_class == csc_auto);
5779 /* For a function definition, record the argument information
5780 block where store_parm_decls will look for it. */
5782 current_function_arg_info = arg_info;
5784 if (declspecs->default_int_p)
5785 C_FUNCTION_IMPLICIT_INT (decl) = 1;
5787 /* Record presence of `inline', if it is reasonable. */
5788 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
5790 if (declspecs->inline_p)
5791 pedwarn (loc, 0, "cannot inline function %<main%>");
5793 else if (declspecs->inline_p)
5794 /* Record that the function is declared `inline'. */
5795 DECL_DECLARED_INLINE_P (decl) = 1;
5799 /* It's a variable. */
5800 /* An uninitialized decl with `extern' is a reference. */
5801 int extern_ref = !initialized && storage_class == csc_extern;
5803 type = c_build_qualified_type (type, type_quals);
5805 /* C99 6.2.2p7: It is invalid (compile-time undefined
5806 behavior) to create an 'extern' declaration for a
5807 variable if there is a global declaration that is
5808 'static' and the global declaration is not visible.
5809 (If the static declaration _is_ currently visible,
5810 the 'extern' declaration is taken to refer to that decl.) */
5811 if (extern_ref && current_scope != file_scope)
5813 tree global_decl = identifier_global_value (declarator->u.id);
5814 tree visible_decl = lookup_name (declarator->u.id);
5817 && global_decl != visible_decl
5818 && TREE_CODE (global_decl) == VAR_DECL
5819 && !TREE_PUBLIC (global_decl))
5820 error_at (loc, "variable previously declared %<static%> "
5821 "redeclared %<extern%>");
5824 decl = build_decl (declarator->id_loc,
5825 VAR_DECL, declarator->u.id, type);
5827 C_DECL_VARIABLE_SIZE (decl) = 1;
5829 if (declspecs->inline_p)
5830 pedwarn (loc, 0, "variable %q+D declared %<inline%>", decl);
5832 /* At file scope, an initialized extern declaration may follow
5833 a static declaration. In that case, DECL_EXTERNAL will be
5834 reset later in start_decl. */
5835 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
5837 /* At file scope, the presence of a `static' or `register' storage
5838 class specifier, or the absence of all storage class specifiers
5839 makes this declaration a definition (perhaps tentative). Also,
5840 the absence of `static' makes it public. */
5841 if (current_scope == file_scope)
5843 TREE_PUBLIC (decl) = storage_class != csc_static;
5844 TREE_STATIC (decl) = !extern_ref;
5846 /* Not at file scope, only `static' makes a static definition. */
5849 TREE_STATIC (decl) = (storage_class == csc_static);
5850 TREE_PUBLIC (decl) = extern_ref;
5854 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
5857 if ((storage_class == csc_extern
5858 || (storage_class == csc_none
5859 && TREE_CODE (type) == FUNCTION_TYPE
5861 && variably_modified_type_p (type, NULL_TREE))
5864 if (TREE_CODE (type) == FUNCTION_TYPE)
5865 error_at (loc, "non-nested function with variably modified type");
5867 error_at (loc, "object with variably modified type must have "
5871 /* Record `register' declaration for warnings on &
5872 and in case doing stupid register allocation. */
5874 if (storage_class == csc_register)
5876 C_DECL_REGISTER (decl) = 1;
5877 DECL_REGISTER (decl) = 1;
5880 /* Record constancy and volatility. */
5881 c_apply_type_quals_to_decl (type_quals, decl);
5883 /* If a type has volatile components, it should be stored in memory.
5884 Otherwise, the fact that those components are volatile
5885 will be ignored, and would even crash the compiler.
5886 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
5887 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
5888 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
5889 || TREE_CODE (decl) == RESULT_DECL))
5891 /* It is not an error for a structure with volatile fields to
5892 be declared register, but reset DECL_REGISTER since it
5893 cannot actually go in a register. */
5894 int was_reg = C_DECL_REGISTER (decl);
5895 C_DECL_REGISTER (decl) = 0;
5896 DECL_REGISTER (decl) = 0;
5897 c_mark_addressable (decl);
5898 C_DECL_REGISTER (decl) = was_reg;
5901 /* This is the earliest point at which we might know the assembler
5902 name of a variable. Thus, if it's known before this, die horribly. */
5903 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
5906 && TREE_CODE (decl) == VAR_DECL
5907 && TREE_PUBLIC (decl)
5908 && TREE_STATIC (decl)
5909 && (TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
5910 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
5911 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
5912 && TYPE_NAME (TREE_TYPE (decl)) == NULL_TREE)
5913 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc___compat,
5914 ("non-local variable %qD with anonymous type is "
5915 "questionable in C++"),
5922 /* Decode the parameter-list info for a function type or function definition.
5923 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5924 if there is an identifier list instead of a parameter decl list).
5925 These two functions are separate because when a function returns
5926 or receives functions then each is called multiple times but the order
5927 of calls is different. The last call to `grokparms' is always the one
5928 that contains the formal parameter names of a function definition.
5930 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5932 FUNCDEF_FLAG is true for a function definition, false for
5933 a mere declaration. A nonempty identifier-list gets an error message
5934 when FUNCDEF_FLAG is false. */
5937 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5939 tree arg_types = arg_info->types;
5941 if (funcdef_flag && arg_info->had_vla_unspec)
5943 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5945 error ("%<[*]%> not allowed in other than function prototype scope");
5948 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5949 warning (OPT_Wstrict_prototypes,
5950 "function declaration isn%'t a prototype");
5952 if (arg_types == error_mark_node)
5953 return 0; /* don't set TYPE_ARG_TYPES in this case */
5955 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5958 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
5960 arg_info->parms = arg_info->types;
5961 arg_info->types = 0;
5966 tree parm, type, typelt;
5967 unsigned int parmno;
5970 /* If there is a parameter of incomplete type in a definition,
5971 this is an error. In a declaration this is valid, and a
5972 struct or union type may be completed later, before any calls
5973 or definition of the function. In the case where the tag was
5974 first declared within the parameter list, a warning has
5975 already been given. If a parameter has void type, then
5976 however the function cannot be defined or called, so
5979 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5981 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5983 type = TREE_VALUE (typelt);
5984 if (type == error_mark_node)
5987 if (!COMPLETE_TYPE_P (type))
5991 if (DECL_NAME (parm))
5992 error_at (input_location,
5993 "parameter %u (%q+D) has incomplete type",
5996 error_at (DECL_SOURCE_LOCATION (parm),
5997 "parameter %u has incomplete type",
6000 TREE_VALUE (typelt) = error_mark_node;
6001 TREE_TYPE (parm) = error_mark_node;
6003 else if (VOID_TYPE_P (type))
6005 if (DECL_NAME (parm))
6006 warning_at (input_location, 0,
6007 "parameter %u (%q+D) has void type",
6010 warning_at (DECL_SOURCE_LOCATION (parm), 0,
6011 "parameter %u has void type",
6016 errmsg = targetm.invalid_parameter_type (type);
6020 TREE_VALUE (typelt) = error_mark_node;
6021 TREE_TYPE (parm) = error_mark_node;
6024 if (DECL_NAME (parm) && TREE_USED (parm))
6025 warn_if_shadowing (parm);
6031 /* Take apart the current scope and return a c_arg_info structure with
6032 info on a parameter list just parsed.
6034 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6036 ELLIPSIS being true means the argument list ended in '...' so don't
6037 append a sentinel (void_list_node) to the end of the type-list. */
6040 get_parm_info (bool ellipsis)
6042 struct c_binding *b = current_scope->bindings;
6043 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
6050 static bool explained_incomplete_types = false;
6051 bool gave_void_only_once_err = false;
6053 arg_info->parms = 0;
6055 arg_info->types = 0;
6056 arg_info->others = 0;
6057 arg_info->pending_sizes = 0;
6058 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
6060 /* The bindings in this scope must not get put into a block.
6061 We will take care of deleting the binding nodes. */
6062 current_scope->bindings = 0;
6064 /* This function is only called if there was *something* on the
6068 /* A parameter list consisting solely of 'void' indicates that the
6069 function takes no arguments. But if the 'void' is qualified
6070 (by 'const' or 'volatile'), or has a storage class specifier
6071 ('register'), then the behavior is undefined; issue an error.
6072 Typedefs for 'void' are OK (see DR#157). */
6073 if (b->prev == 0 /* one binding */
6074 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
6075 && !DECL_NAME (b->decl) /* anonymous */
6076 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
6078 if (TREE_THIS_VOLATILE (b->decl)
6079 || TREE_READONLY (b->decl)
6080 || C_DECL_REGISTER (b->decl))
6081 error ("%<void%> as only parameter may not be qualified");
6083 /* There cannot be an ellipsis. */
6085 error ("%<void%> must be the only parameter");
6087 arg_info->types = void_list_node;
6092 types = void_list_node;
6094 /* Break up the bindings list into parms, tags, types, and others;
6095 apply sanity checks; purge the name-to-decl bindings. */
6098 tree decl = b->decl;
6099 tree type = TREE_TYPE (decl);
6100 const char *keyword;
6102 switch (TREE_CODE (decl))
6107 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6108 I_SYMBOL_BINDING (b->id) = b->shadowed;
6111 /* Check for forward decls that never got their actual decl. */
6112 if (TREE_ASM_WRITTEN (decl))
6113 error ("parameter %q+D has just a forward declaration", decl);
6114 /* Check for (..., void, ...) and issue an error. */
6115 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
6117 if (!gave_void_only_once_err)
6119 error ("%<void%> must be the only parameter");
6120 gave_void_only_once_err = true;
6125 /* Valid parameter, add it to the list. */
6126 TREE_CHAIN (decl) = parms;
6129 /* Since there is a prototype, args are passed in their
6130 declared types. The back end may override this later. */
6131 DECL_ARG_TYPE (decl) = type;
6132 types = tree_cons (0, type, types);
6136 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
6137 case UNION_TYPE: keyword = "union"; goto tag;
6138 case RECORD_TYPE: keyword = "struct"; goto tag;
6140 /* Types may not have tag-names, in which case the type
6141 appears in the bindings list with b->id NULL. */
6144 gcc_assert (I_TAG_BINDING (b->id) == b);
6145 I_TAG_BINDING (b->id) = b->shadowed;
6148 /* Warn about any struct, union or enum tags defined in a
6149 parameter list. The scope of such types is limited to
6150 the parameter list, which is rarely if ever desirable
6151 (it's impossible to call such a function with type-
6152 correct arguments). An anonymous union parm type is
6153 meaningful as a GNU extension, so don't warn for that. */
6154 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
6157 /* The %s will be one of 'struct', 'union', or 'enum'. */
6158 warning (0, "%<%s %E%> declared inside parameter list",
6161 /* The %s will be one of 'struct', 'union', or 'enum'. */
6162 warning (0, "anonymous %s declared inside parameter list",
6165 if (!explained_incomplete_types)
6167 warning (0, "its scope is only this definition or declaration,"
6168 " which is probably not what you want");
6169 explained_incomplete_types = true;
6173 tags = tree_cons (b->id, decl, tags);
6179 /* CONST_DECLs appear here when we have an embedded enum,
6180 and TYPE_DECLs appear here when we have an embedded struct
6181 or union. No warnings for this - we already warned about the
6182 type itself. FUNCTION_DECLs appear when there is an implicit
6183 function declaration in the parameter list. */
6185 TREE_CHAIN (decl) = others;
6190 /* error_mark_node appears here when we have an undeclared
6191 variable. Just throw it away. */
6194 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
6195 I_SYMBOL_BINDING (b->id) = b->shadowed;
6199 /* Other things that might be encountered. */
6206 b = free_binding_and_advance (b);
6209 arg_info->parms = parms;
6210 arg_info->tags = tags;
6211 arg_info->types = types;
6212 arg_info->others = others;
6213 arg_info->pending_sizes = get_pending_sizes ();
6217 /* Get the struct, enum or union (CODE says which) with tag NAME.
6218 Define the tag as a forward-reference with location LOC if it is
6219 not defined. Return a c_typespec structure for the type
6223 parser_xref_tag (location_t loc, enum tree_code code, tree name)
6225 struct c_typespec ret;
6229 ret.expr = NULL_TREE;
6230 ret.expr_const_operands = true;
6232 /* If a cross reference is requested, look up the type
6233 already defined for this tag and return it. */
6235 ref = lookup_tag (code, name, 0, &refloc);
6236 /* If this is the right type of tag, return what we found.
6237 (This reference will be shadowed by shadow_tag later if appropriate.)
6238 If this is the wrong type of tag, do not return it. If it was the
6239 wrong type in the same scope, we will have had an error
6240 message already; if in a different scope and declaring
6241 a name, pending_xref_error will give an error message; but if in a
6242 different scope and not declaring a name, this tag should
6243 shadow the previous declaration of a different type of tag, and
6244 this would not work properly if we return the reference found.
6245 (For example, with "struct foo" in an outer scope, "union foo;"
6246 must shadow that tag with a new one of union type.) */
6247 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
6248 if (ref && TREE_CODE (ref) == code)
6250 if (C_TYPE_DEFINED_IN_STRUCT (ref)
6251 && loc != UNKNOWN_LOCATION
6257 warning_at (loc, OPT_Wc___compat,
6258 ("enum type defined in struct or union "
6259 "is not visible in C++"));
6260 inform (refloc, "enum type defined here");
6263 warning_at (loc, OPT_Wc___compat,
6264 ("struct defined in struct or union "
6265 "is not visible in C++"));
6266 inform (refloc, "struct defined here");
6269 warning_at (loc, OPT_Wc___compat,
6270 ("union defined in struct or union "
6271 "is not visible in C++"));
6272 inform (refloc, "union defined here");
6283 /* If no such tag is yet defined, create a forward-reference node
6284 and record it as the "definition".
6285 When a real declaration of this type is found,
6286 the forward-reference will be altered into a real type. */
6288 ref = make_node (code);
6289 if (code == ENUMERAL_TYPE)
6291 /* Give the type a default layout like unsigned int
6292 to avoid crashing if it does not get defined. */
6293 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
6294 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
6295 TYPE_USER_ALIGN (ref) = 0;
6296 TYPE_UNSIGNED (ref) = 1;
6297 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
6298 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
6299 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
6302 pushtag (loc, name, ref);
6308 /* Get the struct, enum or union (CODE says which) with tag NAME.
6309 Define the tag as a forward-reference if it is not defined.
6310 Return a tree for the type. */
6313 xref_tag (enum tree_code code, tree name)
6315 return parser_xref_tag (input_location, code, name).spec;
6318 /* Make sure that the tag NAME is defined *in the current scope*
6319 at least as a forward reference.
6320 LOC is the location of the struct's definition.
6321 CODE says which kind of tag NAME ought to be.
6323 This stores the current value of the file static STRUCT_PARSE_INFO
6324 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6325 new c_struct_parse_info structure. The old value of
6326 STRUCT_PARSE_INFO is restored in finish_struct. */
6329 start_struct (location_t loc, enum tree_code code, tree name,
6330 struct c_struct_parse_info **enclosing_struct_parse_info)
6332 /* If there is already a tag defined at this scope
6333 (as a forward reference), just return it. */
6335 tree ref = NULL_TREE;
6336 location_t refloc = UNKNOWN_LOCATION;
6338 if (name != NULL_TREE)
6339 ref = lookup_tag (code, name, 1, &refloc);
6340 if (ref && TREE_CODE (ref) == code)
6342 if (TYPE_SIZE (ref))
6344 if (code == UNION_TYPE)
6345 error_at (loc, "redefinition of %<union %E%>", name);
6347 error_at (loc, "redefinition of %<struct %E%>", name);
6348 if (refloc != UNKNOWN_LOCATION)
6349 inform (refloc, "originally defined here");
6350 /* Don't create structures using a name already in use. */
6353 else if (C_TYPE_BEING_DEFINED (ref))
6355 if (code == UNION_TYPE)
6356 error_at (loc, "nested redefinition of %<union %E%>", name);
6358 error_at (loc, "nested redefinition of %<struct %E%>", name);
6359 /* Don't bother to report "originally defined here" for a
6360 nested redefinition; the original definition should be
6362 /* Don't create structures that contain themselves. */
6367 /* Otherwise create a forward-reference just so the tag is in scope. */
6369 if (ref == NULL_TREE || TREE_CODE (ref) != code)
6371 ref = make_node (code);
6372 pushtag (loc, name, ref);
6375 C_TYPE_BEING_DEFINED (ref) = 1;
6376 TYPE_PACKED (ref) = flag_pack_struct;
6378 *enclosing_struct_parse_info = struct_parse_info;
6379 struct_parse_info = XNEW (struct c_struct_parse_info);
6380 struct_parse_info->struct_types = VEC_alloc (tree, heap, 0);
6381 struct_parse_info->fields = VEC_alloc (c_binding_ptr, heap, 0);
6382 struct_parse_info->typedefs_seen = VEC_alloc (tree, heap, 0);
6384 /* FIXME: This will issue a warning for a use of a type defined
6385 within a statement expr used within sizeof, et. al. This is not
6386 terribly serious as C++ doesn't permit statement exprs within
6388 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6389 warning_at (loc, OPT_Wc___compat,
6390 "defining type in %qs expression is invalid in C++",
6393 : (in_typeof ? "typeof" : "alignof")));
6398 /* Process the specs, declarator and width (NULL if omitted)
6399 of a structure component, returning a FIELD_DECL node.
6400 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6401 DECL_ATTRS is as for grokdeclarator.
6403 LOC is the location of the structure component.
6405 This is done during the parsing of the struct declaration.
6406 The FIELD_DECL nodes are chained together and the lot of them
6407 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6410 grokfield (location_t loc,
6411 struct c_declarator *declarator, struct c_declspecs *declspecs,
6412 tree width, tree *decl_attrs)
6416 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
6417 && width == NULL_TREE)
6419 /* This is an unnamed decl.
6421 If we have something of the form "union { list } ;" then this
6422 is the anonymous union extension. Similarly for struct.
6424 If this is something of the form "struct foo;", then
6425 If MS extensions are enabled, this is handled as an
6427 Otherwise this is a forward declaration of a structure tag.
6429 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6430 If MS extensions are enabled and foo names a structure, then
6431 again this is an anonymous struct.
6432 Otherwise this is an error.
6434 Oh what a horrid tangled web we weave. I wonder if MS consciously
6435 took this from Plan 9 or if it was an accident of implementation
6436 that took root before someone noticed the bug... */
6438 tree type = declspecs->type;
6439 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
6440 || TREE_CODE (type) == UNION_TYPE);
6444 && (flag_ms_extensions || !declspecs->typedef_p))
6446 if (flag_ms_extensions)
6450 else if (TYPE_NAME (type) == NULL)
6457 pedwarn (loc, 0, "declaration does not declare anything");
6460 pedwarn (loc, OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions");
6463 value = grokdeclarator (declarator, declspecs, FIELD, false,
6464 width ? &width : NULL, decl_attrs, NULL, NULL,
6467 finish_decl (value, loc, NULL_TREE, NULL_TREE, NULL_TREE);
6468 DECL_INITIAL (value) = width;
6470 if (warn_cxx_compat && DECL_NAME (value) != NULL_TREE)
6472 /* If we currently have a binding for this field, set the
6473 in_struct field in the binding, so that we warn about lookups
6475 struct c_binding *b = I_SYMBOL_BINDING (DECL_NAME (value));
6478 /* If the in_struct field is not yet set, push it on a list
6479 to be cleared when this struct is finished. */
6482 VEC_safe_push (c_binding_ptr, heap,
6483 struct_parse_info->fields, b);
6492 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6493 the list such that this does not present a problem later. */
6496 detect_field_duplicates (tree fieldlist)
6501 /* First, see if there are more than "a few" fields.
6502 This is trivially true if there are zero or one fields. */
6505 x = TREE_CHAIN (fieldlist);
6511 } while (timeout > 0 && x);
6513 /* If there were "few" fields, avoid the overhead of allocating
6514 a hash table. Instead just do the nested traversal thing. */
6517 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
6520 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
6521 if (DECL_NAME (y) == DECL_NAME (x))
6523 error ("duplicate member %q+D", x);
6524 DECL_NAME (x) = NULL_TREE;
6530 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
6533 for (x = fieldlist; x ; x = TREE_CHAIN (x))
6534 if ((y = DECL_NAME (x)) != 0)
6536 slot = htab_find_slot (htab, y, INSERT);
6539 error ("duplicate member %q+D", x);
6540 DECL_NAME (x) = NULL_TREE;
6549 /* Finish up struct info used by -Wc++-compat. */
6552 warn_cxx_compat_finish_struct (tree fieldlist)
6556 struct c_binding *b;
6558 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6559 the current struct. We do this now at the end of the struct
6560 because the flag is used to issue visibility warnings, and we
6561 only want to issue those warnings if the type is referenced
6562 outside of the struct declaration. */
6563 for (ix = 0; VEC_iterate (tree, struct_parse_info->struct_types, ix, x); ++ix)
6564 C_TYPE_DEFINED_IN_STRUCT (x) = 1;
6566 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6567 typedefs used when declaring fields in this struct. If the name
6568 of any of the fields is also a typedef name then the struct would
6569 not parse in C++, because the C++ lookup rules say that the
6570 typedef name would be looked up in the context of the struct, and
6571 would thus be the field rather than the typedef. */
6572 if (!VEC_empty (tree, struct_parse_info->typedefs_seen)
6573 && fieldlist != NULL_TREE)
6575 /* Use a pointer_set using the name of the typedef. We can use
6576 a pointer_set because identifiers are interned. */
6577 struct pointer_set_t *tset = pointer_set_create ();
6580 VEC_iterate (tree, struct_parse_info->typedefs_seen, ix, x);
6582 pointer_set_insert (tset, DECL_NAME (x));
6584 for (x = fieldlist; x != NULL_TREE; x = TREE_CHAIN (x))
6586 if (pointer_set_contains (tset, DECL_NAME (x)))
6588 warning_at (DECL_SOURCE_LOCATION (x), OPT_Wc___compat,
6589 ("using %qD as both field and typedef name is "
6592 /* FIXME: It would be nice to report the location where
6593 the typedef name is used. */
6597 pointer_set_destroy (tset);
6600 /* For each field which has a binding and which was not defined in
6601 an enclosing struct, clear the in_struct field. */
6603 VEC_iterate (c_binding_ptr, struct_parse_info->fields, ix, b);
6608 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6609 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6610 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6611 ATTRIBUTES are attributes to be applied to the structure.
6613 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6614 the struct was started. */
6617 finish_struct (location_t loc, tree t, tree fieldlist, tree attributes,
6618 struct c_struct_parse_info *enclosing_struct_parse_info)
6621 bool toplevel = file_scope == current_scope;
6622 int saw_named_field;
6624 /* If this type was previously laid out as a forward reference,
6625 make sure we lay it out again. */
6629 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6633 for (x = fieldlist; x; x = TREE_CHAIN (x))
6634 if (DECL_NAME (x) != 0)
6639 if (TREE_CODE (t) == UNION_TYPE)
6642 pedwarn (loc, OPT_pedantic, "union has no named members");
6644 pedwarn (loc, OPT_pedantic, "union has no members");
6649 pedwarn (loc, OPT_pedantic, "struct has no named members");
6651 pedwarn (loc, OPT_pedantic, "struct has no members");
6656 /* Install struct as DECL_CONTEXT of each field decl.
6657 Also process specified field sizes, found in the DECL_INITIAL,
6658 storing 0 there after the type has been changed to precision equal
6659 to its width, rather than the precision of the specified standard
6660 type. (Correct layout requires the original type to have been preserved
6663 saw_named_field = 0;
6664 for (x = fieldlist; x; x = TREE_CHAIN (x))
6666 if (TREE_TYPE (x) == error_mark_node)
6669 DECL_CONTEXT (x) = t;
6671 /* If any field is const, the structure type is pseudo-const. */
6672 if (TREE_READONLY (x))
6673 C_TYPE_FIELDS_READONLY (t) = 1;
6676 /* A field that is pseudo-const makes the structure likewise. */
6677 tree t1 = TREE_TYPE (x);
6678 while (TREE_CODE (t1) == ARRAY_TYPE)
6679 t1 = TREE_TYPE (t1);
6680 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
6681 && C_TYPE_FIELDS_READONLY (t1))
6682 C_TYPE_FIELDS_READONLY (t) = 1;
6685 /* Any field that is volatile means variables of this type must be
6686 treated in some ways as volatile. */
6687 if (TREE_THIS_VOLATILE (x))
6688 C_TYPE_FIELDS_VOLATILE (t) = 1;
6690 /* Any field of nominal variable size implies structure is too. */
6691 if (C_DECL_VARIABLE_SIZE (x))
6692 C_TYPE_VARIABLE_SIZE (t) = 1;
6694 if (DECL_INITIAL (x))
6696 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
6697 DECL_SIZE (x) = bitsize_int (width);
6698 DECL_BIT_FIELD (x) = 1;
6699 SET_DECL_C_BIT_FIELD (x);
6703 && (DECL_BIT_FIELD (x)
6704 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
6705 DECL_PACKED (x) = 1;
6707 /* Detect flexible array member in an invalid context. */
6708 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
6709 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
6710 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
6711 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
6713 if (TREE_CODE (t) == UNION_TYPE)
6715 error_at (DECL_SOURCE_LOCATION (x),
6716 "flexible array member in union");
6717 TREE_TYPE (x) = error_mark_node;
6719 else if (TREE_CHAIN (x) != NULL_TREE)
6721 error_at (DECL_SOURCE_LOCATION (x),
6722 "flexible array member not at end of struct");
6723 TREE_TYPE (x) = error_mark_node;
6725 else if (!saw_named_field)
6727 error_at (DECL_SOURCE_LOCATION (x),
6728 "flexible array member in otherwise empty struct");
6729 TREE_TYPE (x) = error_mark_node;
6733 if (pedantic && TREE_CODE (t) == RECORD_TYPE
6734 && flexible_array_type_p (TREE_TYPE (x)))
6735 pedwarn (DECL_SOURCE_LOCATION (x), OPT_pedantic,
6736 "invalid use of structure with flexible array member");
6739 saw_named_field = 1;
6742 detect_field_duplicates (fieldlist);
6744 /* Now we have the nearly final fieldlist. Record it,
6745 then lay out the structure or union (including the fields). */
6747 TYPE_FIELDS (t) = fieldlist;
6751 /* Give bit-fields their proper types. */
6753 tree *fieldlistp = &fieldlist;
6755 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
6756 && TREE_TYPE (*fieldlistp) != error_mark_node)
6758 unsigned HOST_WIDE_INT width
6759 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
6760 tree type = TREE_TYPE (*fieldlistp);
6761 if (width != TYPE_PRECISION (type))
6763 TREE_TYPE (*fieldlistp)
6764 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
6765 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
6767 DECL_INITIAL (*fieldlistp) = 0;
6770 fieldlistp = &TREE_CHAIN (*fieldlistp);
6773 /* Now we have the truly final field list.
6774 Store it in this type and in the variants. */
6776 TYPE_FIELDS (t) = fieldlist;
6778 /* If there are lots of fields, sort so we can look through them fast.
6779 We arbitrarily consider 16 or more elts to be "a lot". */
6784 for (x = fieldlist; x; x = TREE_CHAIN (x))
6786 if (len > 15 || DECL_NAME (x) == NULL)
6794 struct lang_type *space;
6795 struct sorted_fields_type *space2;
6797 len += list_length (x);
6799 /* Use the same allocation policy here that make_node uses, to
6800 ensure that this lives as long as the rest of the struct decl.
6801 All decls in an inline function need to be saved. */
6803 space = GGC_CNEW (struct lang_type);
6804 space2 = GGC_NEWVAR (struct sorted_fields_type,
6805 sizeof (struct sorted_fields_type) + len * sizeof (tree));
6809 field_array = &space2->elts[0];
6810 for (x = fieldlist; x; x = TREE_CHAIN (x))
6812 field_array[len++] = x;
6814 /* If there is anonymous struct or union, break out of the loop. */
6815 if (DECL_NAME (x) == NULL)
6818 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
6821 TYPE_LANG_SPECIFIC (t) = space;
6822 TYPE_LANG_SPECIFIC (t)->s->len = len;
6823 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
6824 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6829 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6831 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6832 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6833 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
6834 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
6835 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
6838 /* If this was supposed to be a transparent union, but we can't
6839 make it one, warn and turn off the flag. */
6840 if (TREE_CODE (t) == UNION_TYPE
6841 && TYPE_TRANSPARENT_UNION (t)
6842 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
6844 TYPE_TRANSPARENT_UNION (t) = 0;
6845 warning_at (loc, 0, "union cannot be made transparent");
6848 /* If this structure or union completes the type of any previous
6849 variable declaration, lay it out and output its rtl. */
6850 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
6854 tree decl = TREE_VALUE (x);
6855 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6856 layout_array_type (TREE_TYPE (decl));
6857 if (TREE_CODE (decl) != TYPE_DECL)
6859 layout_decl (decl, 0);
6860 if (c_dialect_objc ())
6861 objc_check_decl (decl);
6862 rest_of_decl_compilation (decl, toplevel, 0);
6867 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
6869 /* Update type location to the one of the definition, instead of e.g.
6870 a forward declaration. */
6871 if (TYPE_STUB_DECL (t))
6872 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t)) = loc;
6874 /* Finish debugging output for this type. */
6875 rest_of_type_compilation (t, toplevel);
6877 /* If we're inside a function proper, i.e. not file-scope and not still
6878 parsing parameters, then arrange for the size of a variable sized type
6880 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
6881 add_stmt (build_stmt (loc,
6882 DECL_EXPR, build_decl (loc, TYPE_DECL, NULL, t)));
6884 if (warn_cxx_compat)
6885 warn_cxx_compat_finish_struct (fieldlist);
6887 VEC_free (tree, heap, struct_parse_info->struct_types);
6888 VEC_free (c_binding_ptr, heap, struct_parse_info->fields);
6889 VEC_free (tree, heap, struct_parse_info->typedefs_seen);
6890 XDELETE (struct_parse_info);
6892 struct_parse_info = enclosing_struct_parse_info;
6894 /* If this struct is defined inside a struct, add it to
6897 && struct_parse_info != NULL
6898 && !in_sizeof && !in_typeof && !in_alignof)
6899 VEC_safe_push (tree, heap, struct_parse_info->struct_types, t);
6904 /* Lay out the type T, and its element type, and so on. */
6907 layout_array_type (tree t)
6909 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6910 layout_array_type (TREE_TYPE (t));
6914 /* Begin compiling the definition of an enumeration type.
6915 NAME is its name (or null if anonymous).
6916 LOC is the enum's location.
6917 Returns the type object, as yet incomplete.
6918 Also records info about it so that build_enumerator
6919 may be used to declare the individual values as they are read. */
6922 start_enum (location_t loc, struct c_enum_contents *the_enum, tree name)
6924 tree enumtype = NULL_TREE;
6925 location_t enumloc = UNKNOWN_LOCATION;
6927 /* If this is the real definition for a previous forward reference,
6928 fill in the contents in the same object that used to be the
6929 forward reference. */
6931 if (name != NULL_TREE)
6932 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1, &enumloc);
6934 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6936 enumtype = make_node (ENUMERAL_TYPE);
6937 pushtag (loc, name, enumtype);
6940 if (C_TYPE_BEING_DEFINED (enumtype))
6941 error_at (loc, "nested redefinition of %<enum %E%>", name);
6943 C_TYPE_BEING_DEFINED (enumtype) = 1;
6945 if (TYPE_VALUES (enumtype) != 0)
6947 /* This enum is a named one that has been declared already. */
6948 error_at (loc, "redeclaration of %<enum %E%>", name);
6949 if (enumloc != UNKNOWN_LOCATION)
6950 inform (enumloc, "originally defined here");
6952 /* Completely replace its old definition.
6953 The old enumerators remain defined, however. */
6954 TYPE_VALUES (enumtype) = 0;
6957 the_enum->enum_next_value = integer_zero_node;
6958 the_enum->enum_overflow = 0;
6960 if (flag_short_enums)
6961 TYPE_PACKED (enumtype) = 1;
6963 /* FIXME: This will issue a warning for a use of a type defined
6964 within sizeof in a statement expr. This is not terribly serious
6965 as C++ doesn't permit statement exprs within sizeof anyhow. */
6966 if (warn_cxx_compat && (in_sizeof || in_typeof || in_alignof))
6967 warning_at (loc, OPT_Wc___compat,
6968 "defining type in %qs expression is invalid in C++",
6971 : (in_typeof ? "typeof" : "alignof")));
6976 /* After processing and defining all the values of an enumeration type,
6977 install their decls in the enumeration type and finish it off.
6978 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6979 and ATTRIBUTES are the specified attributes.
6980 Returns ENUMTYPE. */
6983 finish_enum (tree enumtype, tree values, tree attributes)
6986 tree minnode = 0, maxnode = 0;
6987 int precision, unsign;
6988 bool toplevel = (file_scope == current_scope);
6989 struct lang_type *lt;
6991 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6993 /* Calculate the maximum value of any enumerator in this type. */
6995 if (values == error_mark_node)
6996 minnode = maxnode = integer_zero_node;
6999 minnode = maxnode = TREE_VALUE (values);
7000 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
7002 tree value = TREE_VALUE (pair);
7003 if (tree_int_cst_lt (maxnode, value))
7005 if (tree_int_cst_lt (value, minnode))
7010 /* Construct the final type of this enumeration. It is the same
7011 as one of the integral types - the narrowest one that fits, except
7012 that normally we only go as narrow as int - and signed iff any of
7013 the values are negative. */
7014 unsign = (tree_int_cst_sgn (minnode) >= 0);
7015 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
7016 tree_int_cst_min_precision (maxnode, unsign));
7018 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
7020 tem = c_common_type_for_size (precision, unsign);
7023 warning (0, "enumeration values exceed range of largest integer");
7024 tem = long_long_integer_type_node;
7028 tem = unsign ? unsigned_type_node : integer_type_node;
7030 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
7031 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
7032 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
7033 TYPE_SIZE (enumtype) = 0;
7035 /* If the precision of the type was specific with an attribute and it
7036 was too small, give an error. Otherwise, use it. */
7037 if (TYPE_PRECISION (enumtype))
7039 if (precision > TYPE_PRECISION (enumtype))
7040 error ("specified mode too small for enumeral values");
7043 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
7045 layout_type (enumtype);
7047 if (values != error_mark_node)
7049 /* Change the type of the enumerators to be the enum type. We
7050 need to do this irrespective of the size of the enum, for
7051 proper type checking. Replace the DECL_INITIALs of the
7052 enumerators, and the value slots of the list, with copies
7053 that have the enum type; they cannot be modified in place
7054 because they may be shared (e.g. integer_zero_node) Finally,
7055 change the purpose slots to point to the names of the decls. */
7056 for (pair = values; pair; pair = TREE_CHAIN (pair))
7058 tree enu = TREE_PURPOSE (pair);
7059 tree ini = DECL_INITIAL (enu);
7061 TREE_TYPE (enu) = enumtype;
7063 /* The ISO C Standard mandates enumerators to have type int,
7064 even though the underlying type of an enum type is
7065 unspecified. However, GCC allows enumerators of any
7066 integer type as an extensions. build_enumerator()
7067 converts any enumerators that fit in an int to type int,
7068 to avoid promotions to unsigned types when comparing
7069 integers with enumerators that fit in the int range.
7070 When -pedantic is given, build_enumerator() would have
7071 already warned about those that don't fit. Here we
7072 convert the rest to the enumerator type. */
7073 if (TREE_TYPE (ini) != integer_type_node)
7074 ini = convert (enumtype, ini);
7076 DECL_INITIAL (enu) = ini;
7077 TREE_PURPOSE (pair) = DECL_NAME (enu);
7078 TREE_VALUE (pair) = ini;
7081 TYPE_VALUES (enumtype) = values;
7084 /* Record the min/max values so that we can warn about bit-field
7085 enumerations that are too small for the values. */
7086 lt = GGC_CNEW (struct lang_type);
7087 lt->enum_min = minnode;
7088 lt->enum_max = maxnode;
7089 TYPE_LANG_SPECIFIC (enumtype) = lt;
7091 /* Fix up all variant types of this enum type. */
7092 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
7094 if (tem == enumtype)
7096 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
7097 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
7098 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
7099 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
7100 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
7101 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
7102 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
7103 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
7104 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
7105 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
7106 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
7109 /* Finish debugging output for this type. */
7110 rest_of_type_compilation (enumtype, toplevel);
7112 /* If this enum is defined inside a struct, add it to
7115 && struct_parse_info != NULL
7116 && !in_sizeof && !in_typeof && !in_alignof)
7117 VEC_safe_push (tree, heap, struct_parse_info->struct_types, enumtype);
7122 /* Build and install a CONST_DECL for one value of the
7123 current enumeration type (one that was begun with start_enum).
7124 LOC is the location of the enumerator.
7125 Return a tree-list containing the CONST_DECL and its value.
7126 Assignment of sequential values by default is handled here. */
7129 build_enumerator (location_t loc,
7130 struct c_enum_contents *the_enum, tree name, tree value)
7134 /* Validate and default VALUE. */
7138 /* Don't issue more errors for error_mark_node (i.e. an
7139 undeclared identifier) - just ignore the value expression. */
7140 if (value == error_mark_node)
7142 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)))
7144 error_at (loc, "enumerator value for %qE is not an integer constant",
7150 if (TREE_CODE (value) != INTEGER_CST)
7152 value = c_fully_fold (value, false, NULL);
7153 if (TREE_CODE (value) == INTEGER_CST)
7154 pedwarn (loc, OPT_pedantic,
7155 "enumerator value for %qE is not an integer "
7156 "constant expression", name);
7158 if (TREE_CODE (value) != INTEGER_CST)
7160 error ("enumerator value for %qE is not an integer constant",
7166 value = default_conversion (value);
7167 constant_expression_warning (value);
7172 /* Default based on previous value. */
7173 /* It should no longer be possible to have NON_LVALUE_EXPR
7177 value = the_enum->enum_next_value;
7178 if (the_enum->enum_overflow)
7179 error_at (loc, "overflow in enumeration values");
7181 /* Even though the underlying type of an enum is unspecified, the
7182 type of enumeration constants is explicitly defined as int
7183 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7185 else if (!int_fits_type_p (value, integer_type_node))
7186 pedwarn (loc, OPT_pedantic,
7187 "ISO C restricts enumerator values to range of %<int%>");
7189 /* The ISO C Standard mandates enumerators to have type int, even
7190 though the underlying type of an enum type is unspecified.
7191 However, GCC allows enumerators of any integer type as an
7192 extensions. Here we convert any enumerators that fit in an int
7193 to type int, to avoid promotions to unsigned types when comparing
7194 integers with enumerators that fit in the int range. When
7195 -pedantic is given, we would have already warned about those that
7196 don't fit. We have to do this here rather than in finish_enum
7197 because this value may be used to define more enumerators. */
7198 if (int_fits_type_p (value, integer_type_node))
7199 value = convert (integer_type_node, value);
7201 /* Set basis for default for next value. */
7202 the_enum->enum_next_value
7204 (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location,
7205 PLUS_EXPR, value, integer_one_node, 0);
7206 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
7208 /* Now create a declaration for the enum value name. */
7210 type = TREE_TYPE (value);
7211 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
7212 TYPE_PRECISION (integer_type_node)),
7213 (TYPE_PRECISION (type)
7214 >= TYPE_PRECISION (integer_type_node)
7215 && TYPE_UNSIGNED (type)));
7217 decl = build_decl (loc, CONST_DECL, name, type);
7218 DECL_INITIAL (decl) = convert (type, value);
7221 return tree_cons (decl, value, NULL_TREE);
7225 /* Create the FUNCTION_DECL for a function definition.
7226 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7227 the declaration; they describe the function's name and the type it returns,
7228 but twisted together in a fashion that parallels the syntax of C.
7230 This function creates a binding context for the function body
7231 as well as setting up the FUNCTION_DECL in current_function_decl.
7233 Returns 1 on success. If the DECLARATOR is not suitable for a function
7234 (it defines a datum instead), we return 0, which tells
7235 yyparse to report a parse error. */
7238 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
7241 tree decl1, old_decl;
7242 tree restype, resdecl;
7245 current_function_returns_value = 0; /* Assume, until we see it does. */
7246 current_function_returns_null = 0;
7247 current_function_returns_abnormally = 0;
7248 warn_about_return_type = 0;
7249 c_switch_stack = NULL;
7251 /* Indicate no valid break/continue context by setting these variables
7252 to some non-null, non-label value. We'll notice and emit the proper
7253 error message in c_finish_bc_stmt. */
7254 c_break_label = c_cont_label = size_zero_node;
7256 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
7257 &attributes, NULL, NULL, DEPRECATED_NORMAL);
7259 /* If the declarator is not suitable for a function definition,
7260 cause a syntax error. */
7264 loc = DECL_SOURCE_LOCATION (decl1);
7266 decl_attributes (&decl1, attributes, 0);
7268 if (DECL_DECLARED_INLINE_P (decl1)
7269 && DECL_UNINLINABLE (decl1)
7270 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
7271 warning_at (loc, OPT_Wattributes,
7272 "inline function %qD given attribute noinline",
7275 /* Handle gnu_inline attribute. */
7276 if (declspecs->inline_p
7277 && !flag_gnu89_inline
7278 && TREE_CODE (decl1) == FUNCTION_DECL
7279 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
7280 || current_function_decl))
7282 if (declspecs->storage_class != csc_static)
7283 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
7286 announce_function (decl1);
7288 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
7290 error_at (loc, "return type is an incomplete type");
7291 /* Make it return void instead. */
7293 = build_function_type (void_type_node,
7294 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
7297 if (warn_about_return_type)
7298 pedwarn_c99 (loc, flag_isoc99 ? 0
7299 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
7300 "return type defaults to %<int%>");
7302 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7303 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7304 DECL_INITIAL (decl1) = error_mark_node;
7306 /* If this definition isn't a prototype and we had a prototype declaration
7307 before, copy the arg type info from that prototype. */
7308 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
7309 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
7311 current_function_prototype_locus = UNKNOWN_LOCATION;
7312 current_function_prototype_built_in = false;
7313 current_function_prototype_arg_types = NULL_TREE;
7314 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
7316 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
7317 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7318 TREE_TYPE (TREE_TYPE (old_decl))))
7320 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
7322 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
7323 current_function_prototype_built_in
7324 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
7325 current_function_prototype_arg_types
7326 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
7328 if (TREE_PUBLIC (decl1))
7330 /* If there is an external prototype declaration of this
7331 function, record its location but do not copy information
7332 to this decl. This may be an invisible declaration
7333 (built-in or in a scope which has finished) or simply
7334 have more refined argument types than any declaration
7336 struct c_binding *b;
7337 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
7338 if (B_IN_SCOPE (b, external_scope))
7342 tree ext_decl, ext_type;
7344 ext_type = b->u.type ? b->u.type : TREE_TYPE (ext_decl);
7345 if (TREE_CODE (ext_type) == FUNCTION_TYPE
7346 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
7347 TREE_TYPE (ext_type)))
7349 current_function_prototype_locus
7350 = DECL_SOURCE_LOCATION (ext_decl);
7351 current_function_prototype_built_in
7352 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
7353 current_function_prototype_arg_types
7354 = TYPE_ARG_TYPES (ext_type);
7360 /* Optionally warn of old-fashioned def with no previous prototype. */
7361 if (warn_strict_prototypes
7362 && old_decl != error_mark_node
7363 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
7364 && C_DECL_ISNT_PROTOTYPE (old_decl))
7365 warning_at (loc, OPT_Wstrict_prototypes,
7366 "function declaration isn%'t a prototype");
7367 /* Optionally warn of any global def with no previous prototype. */
7368 else if (warn_missing_prototypes
7369 && old_decl != error_mark_node
7370 && TREE_PUBLIC (decl1)
7371 && !MAIN_NAME_P (DECL_NAME (decl1))
7372 && C_DECL_ISNT_PROTOTYPE (old_decl))
7373 warning_at (loc, OPT_Wmissing_prototypes,
7374 "no previous prototype for %qD", decl1);
7375 /* Optionally warn of any def with no previous prototype
7376 if the function has already been used. */
7377 else if (warn_missing_prototypes
7379 && old_decl != error_mark_node
7380 && TREE_USED (old_decl)
7381 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
7382 warning_at (loc, OPT_Wmissing_prototypes,
7383 "%qD was used with no prototype before its definition", decl1);
7384 /* Optionally warn of any global def with no previous declaration. */
7385 else if (warn_missing_declarations
7386 && TREE_PUBLIC (decl1)
7388 && !MAIN_NAME_P (DECL_NAME (decl1)))
7389 warning_at (loc, OPT_Wmissing_declarations,
7390 "no previous declaration for %qD",
7392 /* Optionally warn of any def with no previous declaration
7393 if the function has already been used. */
7394 else if (warn_missing_declarations
7396 && old_decl != error_mark_node
7397 && TREE_USED (old_decl)
7398 && C_DECL_IMPLICIT (old_decl))
7399 warning_at (loc, OPT_Wmissing_declarations,
7400 "%qD was used with no declaration before its definition", decl1);
7402 /* This function exists in static storage.
7403 (This does not mean `static' in the C sense!) */
7404 TREE_STATIC (decl1) = 1;
7406 /* A nested function is not global. */
7407 if (current_function_decl != 0)
7408 TREE_PUBLIC (decl1) = 0;
7410 /* This is the earliest point at which we might know the assembler
7411 name of the function. Thus, if it's set before this, die horribly. */
7412 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
7414 /* If #pragma weak was used, mark the decl weak now. */
7415 if (current_scope == file_scope)
7416 maybe_apply_pragma_weak (decl1);
7418 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7419 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
7421 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
7422 != integer_type_node)
7423 pedwarn (loc, OPT_Wmain, "return type of %qD is not %<int%>", decl1);
7425 check_main_parameter_types (decl1);
7427 if (!TREE_PUBLIC (decl1))
7428 pedwarn (loc, OPT_Wmain,
7429 "%qD is normally a non-static function", decl1);
7432 /* Record the decl so that the function name is defined.
7433 If we already have a decl for this name, and it is a FUNCTION_DECL,
7434 use the old decl. */
7436 current_function_decl = pushdecl (decl1);
7439 declare_parm_level ();
7441 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
7442 resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
7443 DECL_ARTIFICIAL (resdecl) = 1;
7444 DECL_IGNORED_P (resdecl) = 1;
7445 DECL_RESULT (current_function_decl) = resdecl;
7447 start_fname_decls ();
7452 /* Subroutine of store_parm_decls which handles new-style function
7453 definitions (prototype format). The parms already have decls, so we
7454 need only record them as in effect and complain if any redundant
7455 old-style parm decls were written. */
7457 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
7461 if (current_scope->bindings)
7463 error_at (DECL_SOURCE_LOCATION (fndecl),
7464 "old-style parameter declarations in prototyped "
7465 "function definition");
7467 /* Get rid of the old-style declarations. */
7471 /* Don't issue this warning for nested functions, and don't issue this
7472 warning if we got here because ARG_INFO_TYPES was error_mark_node
7473 (this happens when a function definition has just an ellipsis in
7474 its parameter list). */
7475 else if (!in_system_header && !current_function_scope
7476 && arg_info->types != error_mark_node)
7477 warning_at (DECL_SOURCE_LOCATION (fndecl), OPT_Wtraditional,
7478 "traditional C rejects ISO C style function definitions");
7480 /* Now make all the parameter declarations visible in the function body.
7481 We can bypass most of the grunt work of pushdecl. */
7482 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
7484 DECL_CONTEXT (decl) = current_function_decl;
7485 if (DECL_NAME (decl))
7487 bind (DECL_NAME (decl), decl, current_scope,
7488 /*invisible=*/false, /*nested=*/false,
7490 if (!TREE_USED (decl))
7491 warn_if_shadowing (decl);
7494 error_at (DECL_SOURCE_LOCATION (decl), "parameter name omitted");
7497 /* Record the parameter list in the function declaration. */
7498 DECL_ARGUMENTS (fndecl) = arg_info->parms;
7500 /* Now make all the ancillary declarations visible, likewise. */
7501 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
7503 DECL_CONTEXT (decl) = current_function_decl;
7504 if (DECL_NAME (decl))
7505 bind (DECL_NAME (decl), decl, current_scope,
7506 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7509 /* And all the tag declarations. */
7510 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
7511 if (TREE_PURPOSE (decl))
7512 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
7513 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION);
7516 /* Subroutine of store_parm_decls which handles old-style function
7517 definitions (separate parameter list and declarations). */
7520 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
7522 struct c_binding *b;
7523 tree parm, decl, last;
7524 tree parmids = arg_info->parms;
7525 struct pointer_set_t *seen_args = pointer_set_create ();
7527 if (!in_system_header)
7528 warning_at (DECL_SOURCE_LOCATION (fndecl),
7529 OPT_Wold_style_definition, "old-style function definition");
7531 /* Match each formal parameter name with its declaration. Save each
7532 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7533 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7535 if (TREE_VALUE (parm) == 0)
7537 error_at (DECL_SOURCE_LOCATION (fndecl),
7538 "parameter name missing from parameter list");
7539 TREE_PURPOSE (parm) = 0;
7543 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
7544 if (b && B_IN_CURRENT_SCOPE (b))
7547 /* If we got something other than a PARM_DECL it is an error. */
7548 if (TREE_CODE (decl) != PARM_DECL)
7549 error_at (DECL_SOURCE_LOCATION (decl),
7550 "%qD declared as a non-parameter", decl);
7551 /* If the declaration is already marked, we have a duplicate
7552 name. Complain and ignore the duplicate. */
7553 else if (pointer_set_contains (seen_args, decl))
7555 error_at (DECL_SOURCE_LOCATION (decl),
7556 "multiple parameters named %qD", decl);
7557 TREE_PURPOSE (parm) = 0;
7560 /* If the declaration says "void", complain and turn it into
7562 else if (VOID_TYPE_P (TREE_TYPE (decl)))
7564 error_at (DECL_SOURCE_LOCATION (decl),
7565 "parameter %qD declared with void type", decl);
7566 TREE_TYPE (decl) = integer_type_node;
7567 DECL_ARG_TYPE (decl) = integer_type_node;
7568 layout_decl (decl, 0);
7570 warn_if_shadowing (decl);
7572 /* If no declaration found, default to int. */
7575 /* FIXME diagnostics: This should be the location of the argument,
7576 not the FNDECL. E.g., for an old-style declaration
7578 int f10(v) { blah; }
7580 We should use the location of the V, not the F10.
7581 Unfortunately, the V is an IDENTIFIER_NODE which has no
7582 location. In the future we need locations for c_arg_info
7585 See gcc.dg/Wshadow-3.c for an example of this problem. */
7586 decl = build_decl (DECL_SOURCE_LOCATION (fndecl),
7587 PARM_DECL, TREE_VALUE (parm), integer_type_node);
7588 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
7590 warn_if_shadowing (decl);
7593 pedwarn (DECL_SOURCE_LOCATION (decl),
7594 0, "type of %qD defaults to %<int%>", decl);
7596 warning_at (DECL_SOURCE_LOCATION (decl),
7597 OPT_Wmissing_parameter_type,
7598 "type of %qD defaults to %<int%>", decl);
7601 TREE_PURPOSE (parm) = decl;
7602 pointer_set_insert (seen_args, decl);
7605 /* Now examine the parms chain for incomplete declarations
7606 and declarations with no corresponding names. */
7608 for (b = current_scope->bindings; b; b = b->prev)
7611 if (TREE_CODE (parm) != PARM_DECL)
7614 if (TREE_TYPE (parm) != error_mark_node
7615 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
7617 error_at (DECL_SOURCE_LOCATION (parm),
7618 "parameter %qD has incomplete type", parm);
7619 TREE_TYPE (parm) = error_mark_node;
7622 if (!pointer_set_contains (seen_args, parm))
7624 error_at (DECL_SOURCE_LOCATION (parm),
7625 "declaration for parameter %qD but no such parameter",
7628 /* Pretend the parameter was not missing.
7629 This gets us to a standard state and minimizes
7630 further error messages. */
7631 parmids = chainon (parmids, tree_cons (parm, 0, 0));
7635 /* Chain the declarations together in the order of the list of
7636 names. Store that chain in the function decl, replacing the
7637 list of names. Update the current scope to match. */
7638 DECL_ARGUMENTS (fndecl) = 0;
7640 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
7641 if (TREE_PURPOSE (parm))
7643 if (parm && TREE_PURPOSE (parm))
7645 last = TREE_PURPOSE (parm);
7646 DECL_ARGUMENTS (fndecl) = last;
7648 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
7649 if (TREE_PURPOSE (parm))
7651 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7652 last = TREE_PURPOSE (parm);
7654 TREE_CHAIN (last) = 0;
7657 pointer_set_destroy (seen_args);
7659 /* If there was a previous prototype,
7660 set the DECL_ARG_TYPE of each argument according to
7661 the type previously specified, and report any mismatches. */
7663 if (current_function_prototype_arg_types)
7666 for (parm = DECL_ARGUMENTS (fndecl),
7667 type = current_function_prototype_arg_types;
7668 parm || (type && TREE_VALUE (type) != error_mark_node
7669 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
7670 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
7672 if (parm == 0 || type == 0
7673 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
7675 if (current_function_prototype_built_in)
7676 warning_at (DECL_SOURCE_LOCATION (fndecl),
7677 0, "number of arguments doesn%'t match "
7678 "built-in prototype");
7681 /* FIXME diagnostics: This should be the location of
7682 FNDECL, but there is bug when a prototype is
7683 declared inside function context, but defined
7684 outside of it (e.g., gcc.dg/pr15698-2.c). In
7685 which case FNDECL gets the location of the
7686 prototype, not the definition. */
7687 error_at (input_location,
7688 "number of arguments doesn%'t match prototype");
7690 error_at (current_function_prototype_locus,
7691 "prototype declaration");
7695 /* Type for passing arg must be consistent with that
7696 declared for the arg. ISO C says we take the unqualified
7697 type for parameters declared with qualified type. */
7698 if (TREE_TYPE (parm) != error_mark_node
7699 && TREE_TYPE (type) != error_mark_node
7700 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
7701 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
7703 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
7704 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
7706 /* Adjust argument to match prototype. E.g. a previous
7707 `int foo(float);' prototype causes
7708 `int foo(x) float x; {...}' to be treated like
7709 `int foo(float x) {...}'. This is particularly
7710 useful for argument types like uid_t. */
7711 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
7713 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
7714 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
7715 && TYPE_PRECISION (TREE_TYPE (parm))
7716 < TYPE_PRECISION (integer_type_node))
7717 DECL_ARG_TYPE (parm) = integer_type_node;
7719 /* ??? Is it possible to get here with a
7720 built-in prototype or will it always have
7721 been diagnosed as conflicting with an
7722 old-style definition and discarded? */
7723 if (current_function_prototype_built_in)
7724 warning_at (DECL_SOURCE_LOCATION (parm),
7725 OPT_pedantic, "promoted argument %qD "
7726 "doesn%'t match built-in prototype", parm);
7729 pedwarn (DECL_SOURCE_LOCATION (parm),
7730 OPT_pedantic, "promoted argument %qD "
7731 "doesn%'t match prototype", parm);
7732 pedwarn (current_function_prototype_locus, OPT_pedantic,
7733 "prototype declaration");
7738 if (current_function_prototype_built_in)
7739 warning_at (DECL_SOURCE_LOCATION (parm),
7740 0, "argument %qD doesn%'t match "
7741 "built-in prototype", parm);
7744 error_at (DECL_SOURCE_LOCATION (parm),
7745 "argument %qD doesn%'t match prototype", parm);
7746 error_at (current_function_prototype_locus,
7747 "prototype declaration");
7752 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
7755 /* Otherwise, create a prototype that would match. */
7759 tree actual = 0, last = 0, type;
7761 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
7763 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
7765 TREE_CHAIN (last) = type;
7770 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
7772 TREE_CHAIN (last) = type;
7776 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7777 of the type of this function, but we need to avoid having this
7778 affect the types of other similarly-typed functions, so we must
7779 first force the generation of an identical (but separate) type
7780 node for the relevant function type. The new node we create
7781 will be a variant of the main variant of the original function
7784 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
7786 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
7790 /* Store parameter declarations passed in ARG_INFO into the current
7791 function declaration. */
7794 store_parm_decls_from (struct c_arg_info *arg_info)
7796 current_function_arg_info = arg_info;
7797 store_parm_decls ();
7800 /* Store the parameter declarations into the current function declaration.
7801 This is called after parsing the parameter declarations, before
7802 digesting the body of the function.
7804 For an old-style definition, construct a prototype out of the old-style
7805 parameter declarations and inject it into the function's type. */
7808 store_parm_decls (void)
7810 tree fndecl = current_function_decl;
7813 /* The argument information block for FNDECL. */
7814 struct c_arg_info *arg_info = current_function_arg_info;
7815 current_function_arg_info = 0;
7817 /* True if this definition is written with a prototype. Note:
7818 despite C99 6.7.5.3p14, we can *not* treat an empty argument
7819 list in a function definition as equivalent to (void) -- an
7820 empty argument list specifies the function has no parameters,
7821 but only (void) sets up a prototype for future calls. */
7822 proto = arg_info->types != 0;
7825 store_parm_decls_newstyle (fndecl, arg_info);
7827 store_parm_decls_oldstyle (fndecl, arg_info);
7829 /* The next call to push_scope will be a function body. */
7831 next_is_function_body = true;
7833 /* Write a record describing this function definition to the prototypes
7834 file (if requested). */
7836 gen_aux_info_record (fndecl, 1, 0, proto);
7838 /* Initialize the RTL code for the function. */
7839 allocate_struct_function (fndecl, false);
7841 /* Begin the statement tree for this function. */
7842 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
7844 /* ??? Insert the contents of the pending sizes list into the function
7845 to be evaluated. The only reason left to have this is
7846 void foo(int n, int array[n++])
7847 because we throw away the array type in favor of a pointer type, and
7848 thus won't naturally see the SAVE_EXPR containing the increment. All
7849 other pending sizes would be handled by gimplify_parameters. */
7852 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
7853 add_stmt (TREE_VALUE (t));
7856 /* Even though we're inside a function body, we still don't want to
7857 call expand_expr to calculate the size of a variable-sized array.
7858 We haven't necessarily assigned RTL to all variables yet, so it's
7859 not safe to try to expand expressions involving them. */
7860 cfun->dont_save_pending_sizes_p = 1;
7864 /* Finish up a function declaration and compile that function
7865 all the way to assembler language output. The free the storage
7866 for the function definition.
7868 This is called after parsing the body of the function definition. */
7871 finish_function (void)
7873 tree fndecl = current_function_decl;
7875 if (TREE_CODE (fndecl) == FUNCTION_DECL
7876 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
7878 tree args = DECL_ARGUMENTS (fndecl);
7879 for (; args; args = TREE_CHAIN (args))
7881 tree type = TREE_TYPE (args);
7882 if (INTEGRAL_TYPE_P (type)
7883 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
7884 DECL_ARG_TYPE (args) = integer_type_node;
7888 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
7889 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7891 /* Must mark the RESULT_DECL as being in this function. */
7893 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
7894 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7896 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
7897 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7898 == integer_type_node && flag_isoc99)
7900 /* Hack. We don't want the middle-end to warn that this return
7901 is unreachable, so we mark its location as special. Using
7902 UNKNOWN_LOCATION has the problem that it gets clobbered in
7903 annotate_one_with_locus. A cleaner solution might be to
7904 ensure ! should_carry_locus_p (stmt), but that needs a flag.
7906 c_finish_return (BUILTINS_LOCATION, integer_zero_node, NULL_TREE);
7909 /* Tie off the statement tree for this function. */
7910 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
7912 finish_fname_decls ();
7914 /* Complain if there's just no return statement. */
7915 if (warn_return_type
7916 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
7917 && !current_function_returns_value && !current_function_returns_null
7918 /* Don't complain if we are no-return. */
7919 && !current_function_returns_abnormally
7920 /* Don't warn for main(). */
7921 && !MAIN_NAME_P (DECL_NAME (fndecl))
7922 /* Or if they didn't actually specify a return type. */
7923 && !C_FUNCTION_IMPLICIT_INT (fndecl)
7924 /* Normally, with -Wreturn-type, flow will complain, but we might
7925 optimize out static functions. */
7926 && !TREE_PUBLIC (fndecl))
7928 warning (OPT_Wreturn_type,
7929 "no return statement in function returning non-void");
7930 TREE_NO_WARNING (fndecl) = 1;
7933 /* Store the end of the function, so that we get good line number
7934 info for the epilogue. */
7935 cfun->function_end_locus = input_location;
7937 /* Finalize the ELF visibility for the function. */
7938 c_determine_visibility (fndecl);
7940 /* For GNU C extern inline functions disregard inline limits. */
7941 if (DECL_EXTERNAL (fndecl)
7942 && DECL_DECLARED_INLINE_P (fndecl))
7943 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
7945 /* Genericize before inlining. Delay genericizing nested functions
7946 until their parent function is genericized. Since finalizing
7947 requires GENERIC, delay that as well. */
7949 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
7950 && !undef_nested_function)
7952 if (!decl_function_context (fndecl))
7954 c_genericize (fndecl);
7956 /* ??? Objc emits functions after finalizing the compilation unit.
7957 This should be cleaned up later and this conditional removed. */
7958 if (cgraph_global_info_ready)
7960 cgraph_add_new_function (fndecl, false);
7963 cgraph_finalize_function (fndecl, false);
7967 /* Register this function with cgraph just far enough to get it
7968 added to our parent's nested function list. Handy, since the
7969 C front end doesn't have such a list. */
7970 (void) cgraph_node (fndecl);
7974 if (!decl_function_context (fndecl))
7975 undef_nested_function = false;
7977 /* We're leaving the context of this function, so zap cfun.
7978 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
7979 tree_rest_of_compilation. */
7981 current_function_decl = NULL;
7984 /* Check the declarations given in a for-loop for satisfying the C99
7985 constraints. If exactly one such decl is found, return it. LOC is
7986 the location of the opening parenthesis of the for loop. */
7989 check_for_loop_decls (location_t loc)
7991 struct c_binding *b;
7992 tree one_decl = NULL_TREE;
7997 static bool hint = true;
7998 /* If we get here, declarations have been used in a for loop without
7999 the C99 for loop scope. This doesn't make much sense, so don't
8001 error_at (loc, "%<for%> loop initial declarations "
8002 "are only allowed in C99 mode");
8006 "use option -std=c99 or -std=gnu99 to compile your code");
8011 /* C99 subclause 6.8.5 paragraph 3:
8013 [#3] The declaration part of a for statement shall only
8014 declare identifiers for objects having storage class auto or
8017 It isn't clear whether, in this sentence, "identifiers" binds to
8018 "shall only declare" or to "objects" - that is, whether all identifiers
8019 declared must be identifiers for objects, or whether the restriction
8020 only applies to those that are. (A question on this in comp.std.c
8021 in November 2000 received no answer.) We implement the strictest
8022 interpretation, to avoid creating an extension which later causes
8025 for (b = current_scope->bindings; b; b = b->prev)
8028 tree decl = b->decl;
8033 switch (TREE_CODE (decl))
8037 location_t decl_loc = DECL_SOURCE_LOCATION (decl);
8038 if (TREE_STATIC (decl))
8040 "declaration of static variable %qD in %<for%> loop "
8041 "initial declaration", decl);
8042 else if (DECL_EXTERNAL (decl))
8044 "declaration of %<extern%> variable %qD in %<for%> loop "
8045 "initial declaration", decl);
8051 "%<struct %E%> declared in %<for%> loop initial "
8056 "%<union %E%> declared in %<for%> loop initial declaration",
8060 error_at (loc, "%<enum %E%> declared in %<for%> loop "
8061 "initial declaration", id);
8064 error_at (loc, "declaration of non-variable "
8065 "%qD in %<for%> loop initial declaration", decl);
8072 return n_decls == 1 ? one_decl : NULL_TREE;
8075 /* Save and reinitialize the variables
8076 used during compilation of a C function. */
8079 c_push_function_context (void)
8081 struct language_function *p;
8082 p = GGC_NEW (struct language_function);
8085 p->base.x_stmt_tree = c_stmt_tree;
8086 p->x_break_label = c_break_label;
8087 p->x_cont_label = c_cont_label;
8088 p->x_switch_stack = c_switch_stack;
8089 p->arg_info = current_function_arg_info;
8090 p->returns_value = current_function_returns_value;
8091 p->returns_null = current_function_returns_null;
8092 p->returns_abnormally = current_function_returns_abnormally;
8093 p->warn_about_return_type = warn_about_return_type;
8095 push_function_context ();
8098 /* Restore the variables used during compilation of a C function. */
8101 c_pop_function_context (void)
8103 struct language_function *p;
8105 pop_function_context ();
8107 cfun->language = NULL;
8109 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
8110 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
8112 /* Stop pointing to the local nodes about to be freed. */
8113 /* But DECL_INITIAL must remain nonzero so we know this
8114 was an actual function definition. */
8115 DECL_INITIAL (current_function_decl) = error_mark_node;
8116 DECL_ARGUMENTS (current_function_decl) = 0;
8119 c_stmt_tree = p->base.x_stmt_tree;
8120 c_break_label = p->x_break_label;
8121 c_cont_label = p->x_cont_label;
8122 c_switch_stack = p->x_switch_stack;
8123 current_function_arg_info = p->arg_info;
8124 current_function_returns_value = p->returns_value;
8125 current_function_returns_null = p->returns_null;
8126 current_function_returns_abnormally = p->returns_abnormally;
8127 warn_about_return_type = p->warn_about_return_type;
8130 /* The functions below are required for functionality of doing
8131 function at once processing in the C front end. Currently these
8132 functions are not called from anywhere in the C front end, but as
8133 these changes continue, that will change. */
8135 /* Returns the stmt_tree (if any) to which statements are currently
8136 being added. If there is no active statement-tree, NULL is
8140 current_stmt_tree (void)
8142 return &c_stmt_tree;
8145 /* Return the global value of T as a symbol. */
8148 identifier_global_value (tree t)
8150 struct c_binding *b;
8152 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
8153 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
8159 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8160 otherwise the name is found in ridpointers from RID_INDEX. */
8163 record_builtin_type (enum rid rid_index, const char *name, tree type)
8167 id = ridpointers[(int) rid_index];
8169 id = get_identifier (name);
8170 decl = build_decl (UNKNOWN_LOCATION, TYPE_DECL, id, type);
8172 if (debug_hooks->type_decl)
8173 debug_hooks->type_decl (decl, false);
8176 /* Build the void_list_node (void_type_node having been created). */
8178 build_void_list_node (void)
8180 tree t = build_tree_list (NULL_TREE, void_type_node);
8184 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8187 build_c_parm (struct c_declspecs *specs, tree attrs,
8188 struct c_declarator *declarator)
8190 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
8193 ret->declarator = declarator;
8197 /* Return a declarator with nested attributes. TARGET is the inner
8198 declarator to which these attributes apply. ATTRS are the
8201 struct c_declarator *
8202 build_attrs_declarator (tree attrs, struct c_declarator *target)
8204 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8205 ret->kind = cdk_attrs;
8206 ret->declarator = target;
8207 ret->u.attrs = attrs;
8211 /* Return a declarator for a function with arguments specified by ARGS
8212 and return type specified by TARGET. */
8214 struct c_declarator *
8215 build_function_declarator (struct c_arg_info *args,
8216 struct c_declarator *target)
8218 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8219 ret->kind = cdk_function;
8220 ret->declarator = target;
8221 ret->u.arg_info = args;
8225 /* Return a declarator for the identifier IDENT (which may be
8226 NULL_TREE for an abstract declarator). */
8228 struct c_declarator *
8229 build_id_declarator (tree ident)
8231 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8233 ret->declarator = 0;
8235 /* Default value - may get reset to a more precise location. */
8236 ret->id_loc = input_location;
8240 /* Return something to represent absolute declarators containing a *.
8241 TARGET is the absolute declarator that the * contains.
8242 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8243 to apply to the pointer type. */
8245 struct c_declarator *
8246 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
8247 struct c_declarator *target)
8251 struct c_declarator *itarget = target;
8252 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
8253 if (type_quals_attrs)
8255 attrs = type_quals_attrs->attrs;
8256 quals = quals_from_declspecs (type_quals_attrs);
8257 if (attrs != NULL_TREE)
8258 itarget = build_attrs_declarator (attrs, target);
8260 ret->kind = cdk_pointer;
8261 ret->declarator = itarget;
8262 ret->u.pointer_quals = quals;
8266 /* Return a pointer to a structure for an empty list of declaration
8269 struct c_declspecs *
8270 build_null_declspecs (void)
8272 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
8277 ret->typespec_word = cts_none;
8278 ret->storage_class = csc_none;
8279 ret->expr_const_operands = true;
8280 ret->declspecs_seen_p = false;
8281 ret->type_seen_p = false;
8282 ret->non_sc_seen_p = false;
8283 ret->typedef_p = false;
8284 ret->tag_defined_p = false;
8285 ret->explicit_signed_p = false;
8286 ret->deprecated_p = false;
8287 ret->default_int_p = false;
8288 ret->long_p = false;
8289 ret->long_long_p = false;
8290 ret->short_p = false;
8291 ret->signed_p = false;
8292 ret->unsigned_p = false;
8293 ret->complex_p = false;
8294 ret->inline_p = false;
8295 ret->thread_p = false;
8296 ret->const_p = false;
8297 ret->volatile_p = false;
8298 ret->restrict_p = false;
8299 ret->saturating_p = false;
8303 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8306 struct c_declspecs *
8307 declspecs_add_qual (struct c_declspecs *specs, tree qual)
8311 specs->non_sc_seen_p = true;
8312 specs->declspecs_seen_p = true;
8313 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
8314 && C_IS_RESERVED_WORD (qual));
8315 i = C_RID_CODE (qual);
8319 dupe = specs->const_p;
8320 specs->const_p = true;
8323 dupe = specs->volatile_p;
8324 specs->volatile_p = true;
8327 dupe = specs->restrict_p;
8328 specs->restrict_p = true;
8333 if (dupe && !flag_isoc99)
8334 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
8338 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8341 struct c_declspecs *
8342 declspecs_add_type (location_t loc, struct c_declspecs *specs,
8343 struct c_typespec spec)
8345 tree type = spec.spec;
8346 specs->non_sc_seen_p = true;
8347 specs->declspecs_seen_p = true;
8348 specs->type_seen_p = true;
8349 if (TREE_DEPRECATED (type))
8350 specs->deprecated_p = true;
8352 /* Handle type specifier keywords. */
8353 if (TREE_CODE (type) == IDENTIFIER_NODE
8354 && C_IS_RESERVED_WORD (type)
8355 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
8357 enum rid i = C_RID_CODE (type);
8360 error_at (loc, "two or more data types in declaration specifiers");
8363 if ((int) i <= (int) RID_LAST_MODIFIER)
8365 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8370 if (specs->long_long_p)
8372 error_at (loc, "%<long long long%> is too long for GCC");
8377 if (specs->typespec_word == cts_double)
8380 ("both %<long long%> and %<double%> in "
8381 "declaration specifiers"));
8384 pedwarn_c90 (loc, OPT_Wlong_long,
8385 "ISO C90 does not support %<long long%>");
8386 specs->long_long_p = 1;
8391 ("both %<long%> and %<short%> in "
8392 "declaration specifiers"));
8393 else if (specs->typespec_word == cts_void)
8395 ("both %<long%> and %<void%> in "
8396 "declaration specifiers"));
8397 else if (specs->typespec_word == cts_bool)
8399 ("both %<long%> and %<_Bool%> in "
8400 "declaration specifiers"));
8401 else if (specs->typespec_word == cts_char)
8403 ("both %<long%> and %<char%> in "
8404 "declaration specifiers"));
8405 else if (specs->typespec_word == cts_float)
8407 ("both %<long%> and %<float%> in "
8408 "declaration specifiers"));
8409 else if (specs->typespec_word == cts_dfloat32)
8411 ("both %<long%> and %<_Decimal32%> in "
8412 "declaration specifiers"));
8413 else if (specs->typespec_word == cts_dfloat64)
8415 ("both %<long%> and %<_Decimal64%> in "
8416 "declaration specifiers"));
8417 else if (specs->typespec_word == cts_dfloat128)
8419 ("both %<long%> and %<_Decimal128%> in "
8420 "declaration specifiers"));
8422 specs->long_p = true;
8425 dupe = specs->short_p;
8428 ("both %<long%> and %<short%> in "
8429 "declaration specifiers"));
8430 else if (specs->typespec_word == cts_void)
8432 ("both %<short%> and %<void%> in "
8433 "declaration specifiers"));
8434 else if (specs->typespec_word == cts_bool)
8436 ("both %<short%> and %<_Bool%> in "
8437 "declaration specifiers"));
8438 else if (specs->typespec_word == cts_char)
8440 ("both %<short%> and %<char%> in "
8441 "declaration specifiers"));
8442 else if (specs->typespec_word == cts_float)
8444 ("both %<short%> and %<float%> in "
8445 "declaration specifiers"));
8446 else if (specs->typespec_word == cts_double)
8448 ("both %<short%> and %<double%> in "
8449 "declaration specifiers"));
8450 else if (specs->typespec_word == cts_dfloat32)
8452 ("both %<short%> and %<_Decimal32%> in "
8453 "declaration specifiers"));
8454 else if (specs->typespec_word == cts_dfloat64)
8456 ("both %<short%> and %<_Decimal64%> in "
8457 "declaration specifiers"));
8458 else if (specs->typespec_word == cts_dfloat128)
8460 ("both %<short%> and %<_Decimal128%> in "
8461 "declaration specifiers"));
8463 specs->short_p = true;
8466 dupe = specs->signed_p;
8467 if (specs->unsigned_p)
8469 ("both %<signed%> and %<unsigned%> in "
8470 "declaration specifiers"));
8471 else if (specs->typespec_word == cts_void)
8473 ("both %<signed%> and %<void%> in "
8474 "declaration specifiers"));
8475 else if (specs->typespec_word == cts_bool)
8477 ("both %<signed%> and %<_Bool%> in "
8478 "declaration specifiers"));
8479 else if (specs->typespec_word == cts_float)
8481 ("both %<signed%> and %<float%> in "
8482 "declaration specifiers"));
8483 else if (specs->typespec_word == cts_double)
8485 ("both %<signed%> and %<double%> in "
8486 "declaration specifiers"));
8487 else if (specs->typespec_word == cts_dfloat32)
8489 ("both %<signed%> and %<_Decimal32%> in "
8490 "declaration specifiers"));
8491 else if (specs->typespec_word == cts_dfloat64)
8493 ("both %<signed%> and %<_Decimal64%> in "
8494 "declaration specifiers"));
8495 else if (specs->typespec_word == cts_dfloat128)
8497 ("both %<signed%> and %<_Decimal128%> in "
8498 "declaration specifiers"));
8500 specs->signed_p = true;
8503 dupe = specs->unsigned_p;
8504 if (specs->signed_p)
8506 ("both %<signed%> and %<unsigned%> in "
8507 "declaration specifiers"));
8508 else if (specs->typespec_word == cts_void)
8510 ("both %<unsigned%> and %<void%> in "
8511 "declaration specifiers"));
8512 else if (specs->typespec_word == cts_bool)
8514 ("both %<unsigned%> and %<_Bool%> in "
8515 "declaration specifiers"));
8516 else if (specs->typespec_word == cts_float)
8518 ("both %<unsigned%> and %<float%> in "
8519 "declaration specifiers"));
8520 else if (specs->typespec_word == cts_double)
8522 ("both %<unsigned%> and %<double%> in "
8523 "declaration specifiers"));
8524 else if (specs->typespec_word == cts_dfloat32)
8526 ("both %<unsigned%> and %<_Decimal32%> in "
8527 "declaration specifiers"));
8528 else if (specs->typespec_word == cts_dfloat64)
8530 ("both %<unsigned%> and %<_Decimal64%> in "
8531 "declaration specifiers"));
8532 else if (specs->typespec_word == cts_dfloat128)
8534 ("both %<unsigned%> and %<_Decimal128%> in "
8535 "declaration specifiers"));
8537 specs->unsigned_p = true;
8540 dupe = specs->complex_p;
8541 if (!flag_isoc99 && !in_system_header)
8542 pedwarn (loc, OPT_pedantic,
8543 "ISO C90 does not support complex types");
8544 if (specs->typespec_word == cts_void)
8546 ("both %<complex%> and %<void%> in "
8547 "declaration specifiers"));
8548 else if (specs->typespec_word == cts_bool)
8550 ("both %<complex%> and %<_Bool%> in "
8551 "declaration specifiers"));
8552 else if (specs->typespec_word == cts_dfloat32)
8554 ("both %<complex%> and %<_Decimal32%> in "
8555 "declaration specifiers"));
8556 else if (specs->typespec_word == cts_dfloat64)
8558 ("both %<complex%> and %<_Decimal64%> in "
8559 "declaration specifiers"));
8560 else if (specs->typespec_word == cts_dfloat128)
8562 ("both %<complex%> and %<_Decimal128%> in "
8563 "declaration specifiers"));
8564 else if (specs->typespec_word == cts_fract)
8566 ("both %<complex%> and %<_Fract%> in "
8567 "declaration specifiers"));
8568 else if (specs->typespec_word == cts_accum)
8570 ("both %<complex%> and %<_Accum%> in "
8571 "declaration specifiers"));
8572 else if (specs->saturating_p)
8574 ("both %<complex%> and %<_Sat%> in "
8575 "declaration specifiers"));
8577 specs->complex_p = true;
8580 dupe = specs->saturating_p;
8581 pedwarn (loc, OPT_pedantic,
8582 "ISO C does not support saturating types");
8583 if (specs->typespec_word == cts_void)
8585 ("both %<_Sat%> and %<void%> in "
8586 "declaration specifiers"));
8587 else if (specs->typespec_word == cts_bool)
8589 ("both %<_Sat%> and %<_Bool%> in "
8590 "declaration specifiers"));
8591 else if (specs->typespec_word == cts_char)
8593 ("both %<_Sat%> and %<char%> in "
8594 "declaration specifiers"));
8595 else if (specs->typespec_word == cts_int)
8597 ("both %<_Sat%> and %<int%> in "
8598 "declaration specifiers"));
8599 else if (specs->typespec_word == cts_float)
8601 ("both %<_Sat%> and %<float%> in "
8602 "declaration specifiers"));
8603 else if (specs->typespec_word == cts_double)
8605 ("both %<_Sat%> and %<double%> in "
8606 "declaration specifiers"));
8607 else if (specs->typespec_word == cts_dfloat32)
8609 ("both %<_Sat%> and %<_Decimal32%> in "
8610 "declaration specifiers"));
8611 else if (specs->typespec_word == cts_dfloat64)
8613 ("both %<_Sat%> and %<_Decimal64%> in "
8614 "declaration specifiers"));
8615 else if (specs->typespec_word == cts_dfloat128)
8617 ("both %<_Sat%> and %<_Decimal128%> in "
8618 "declaration specifiers"));
8619 else if (specs->complex_p)
8621 ("both %<_Sat%> and %<complex%> in "
8622 "declaration specifiers"));
8624 specs->saturating_p = true;
8631 error_at (loc, "duplicate %qE", type);
8637 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8638 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8639 if (specs->typespec_word != cts_none)
8642 "two or more data types in declaration specifiers");
8650 ("both %<long%> and %<void%> in "
8651 "declaration specifiers"));
8652 else if (specs->short_p)
8654 ("both %<short%> and %<void%> in "
8655 "declaration specifiers"));
8656 else if (specs->signed_p)
8658 ("both %<signed%> and %<void%> in "
8659 "declaration specifiers"));
8660 else if (specs->unsigned_p)
8662 ("both %<unsigned%> and %<void%> in "
8663 "declaration specifiers"));
8664 else if (specs->complex_p)
8666 ("both %<complex%> and %<void%> in "
8667 "declaration specifiers"));
8668 else if (specs->saturating_p)
8670 ("both %<_Sat%> and %<void%> in "
8671 "declaration specifiers"));
8673 specs->typespec_word = cts_void;
8678 ("both %<long%> and %<_Bool%> in "
8679 "declaration specifiers"));
8680 else if (specs->short_p)
8682 ("both %<short%> and %<_Bool%> in "
8683 "declaration specifiers"));
8684 else if (specs->signed_p)
8686 ("both %<signed%> and %<_Bool%> in "
8687 "declaration specifiers"));
8688 else if (specs->unsigned_p)
8690 ("both %<unsigned%> and %<_Bool%> in "
8691 "declaration specifiers"));
8692 else if (specs->complex_p)
8694 ("both %<complex%> and %<_Bool%> in "
8695 "declaration specifiers"));
8696 else if (specs->saturating_p)
8698 ("both %<_Sat%> and %<_Bool%> in "
8699 "declaration specifiers"));
8701 specs->typespec_word = cts_bool;
8706 ("both %<long%> and %<char%> in "
8707 "declaration specifiers"));
8708 else if (specs->short_p)
8710 ("both %<short%> and %<char%> in "
8711 "declaration specifiers"));
8712 else if (specs->saturating_p)
8714 ("both %<_Sat%> and %<char%> in "
8715 "declaration specifiers"));
8717 specs->typespec_word = cts_char;
8720 if (specs->saturating_p)
8722 ("both %<_Sat%> and %<int%> in "
8723 "declaration specifiers"));
8725 specs->typespec_word = cts_int;
8730 ("both %<long%> and %<float%> in "
8731 "declaration specifiers"));
8732 else if (specs->short_p)
8734 ("both %<short%> and %<float%> in "
8735 "declaration specifiers"));
8736 else if (specs->signed_p)
8738 ("both %<signed%> and %<float%> in "
8739 "declaration specifiers"));
8740 else if (specs->unsigned_p)
8742 ("both %<unsigned%> and %<float%> in "
8743 "declaration specifiers"));
8744 else if (specs->saturating_p)
8746 ("both %<_Sat%> and %<float%> in "
8747 "declaration specifiers"));
8749 specs->typespec_word = cts_float;
8752 if (specs->long_long_p)
8754 ("both %<long long%> and %<double%> in "
8755 "declaration specifiers"));
8756 else if (specs->short_p)
8758 ("both %<short%> and %<double%> in "
8759 "declaration specifiers"));
8760 else if (specs->signed_p)
8762 ("both %<signed%> and %<double%> in "
8763 "declaration specifiers"));
8764 else if (specs->unsigned_p)
8766 ("both %<unsigned%> and %<double%> in "
8767 "declaration specifiers"));
8768 else if (specs->saturating_p)
8770 ("both %<_Sat%> and %<double%> in "
8771 "declaration specifiers"));
8773 specs->typespec_word = cts_double;
8780 if (i == RID_DFLOAT32)
8782 else if (i == RID_DFLOAT64)
8785 str = "_Decimal128";
8786 if (specs->long_long_p)
8788 ("both %<long long%> and %<%s%> in "
8789 "declaration specifiers"),
8793 ("both %<long%> and %<%s%> in "
8794 "declaration specifiers"),
8796 else if (specs->short_p)
8798 ("both %<short%> and %<%s%> in "
8799 "declaration specifiers"),
8801 else if (specs->signed_p)
8803 ("both %<signed%> and %<%s%> in "
8804 "declaration specifiers"),
8806 else if (specs->unsigned_p)
8808 ("both %<unsigned%> and %<%s%> in "
8809 "declaration specifiers"),
8811 else if (specs->complex_p)
8813 ("both %<complex%> and %<%s%> in "
8814 "declaration specifiers"),
8816 else if (specs->saturating_p)
8818 ("both %<_Sat%> and %<%s%> in "
8819 "declaration specifiers"),
8821 else if (i == RID_DFLOAT32)
8822 specs->typespec_word = cts_dfloat32;
8823 else if (i == RID_DFLOAT64)
8824 specs->typespec_word = cts_dfloat64;
8826 specs->typespec_word = cts_dfloat128;
8828 if (!targetm.decimal_float_supported_p ())
8830 ("decimal floating point not supported "
8831 "for this target"));
8832 pedwarn (loc, OPT_pedantic,
8833 "ISO C does not support decimal floating point");
8843 if (specs->complex_p)
8845 ("both %<complex%> and %<%s%> in "
8846 "declaration specifiers"),
8848 else if (i == RID_FRACT)
8849 specs->typespec_word = cts_fract;
8851 specs->typespec_word = cts_accum;
8853 if (!targetm.fixed_point_supported_p ())
8855 "fixed-point types not supported for this target");
8856 pedwarn (loc, OPT_pedantic,
8857 "ISO C does not support fixed-point types");
8860 /* ObjC reserved word "id", handled below. */
8866 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
8867 form of ObjC type, cases such as "int" and "long" being handled
8868 above), a TYPE (struct, union, enum and typeof specifiers) or an
8869 ERROR_MARK. In none of these cases may there have previously
8870 been any type specifiers. */
8871 if (specs->type || specs->typespec_word != cts_none
8872 || specs->long_p || specs->short_p || specs->signed_p
8873 || specs->unsigned_p || specs->complex_p)
8874 error_at (loc, "two or more data types in declaration specifiers");
8875 else if (TREE_CODE (type) == TYPE_DECL)
8877 if (TREE_TYPE (type) == error_mark_node)
8878 ; /* Allow the type to default to int to avoid cascading errors. */
8881 specs->type = TREE_TYPE (type);
8882 specs->decl_attr = DECL_ATTRIBUTES (type);
8883 specs->typedef_p = true;
8884 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
8886 /* If this typedef name is defined in a struct, then a C++
8887 lookup would return a different value. */
8889 && I_SYMBOL_BINDING (DECL_NAME (type))->in_struct)
8890 warning_at (loc, OPT_Wc___compat,
8891 "C++ lookup of %qD would return a field, not a type",
8894 /* If we are parsing a struct, record that a struct field
8896 if (warn_cxx_compat && struct_parse_info != NULL)
8897 VEC_safe_push (tree, heap, struct_parse_info->typedefs_seen, type);
8900 else if (TREE_CODE (type) == IDENTIFIER_NODE)
8902 tree t = lookup_name (type);
8903 if (!t || TREE_CODE (t) != TYPE_DECL)
8904 error_at (loc, "%qE fails to be a typedef or built in type", type);
8905 else if (TREE_TYPE (t) == error_mark_node)
8908 specs->type = TREE_TYPE (t);
8910 else if (TREE_CODE (type) != ERROR_MARK)
8912 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
8913 specs->tag_defined_p = true;
8914 if (spec.kind == ctsk_typeof)
8916 specs->typedef_p = true;
8920 specs->expr = build2 (COMPOUND_EXPR, TREE_TYPE (spec.expr),
8921 specs->expr, spec.expr);
8923 specs->expr = spec.expr;
8924 specs->expr_const_operands &= spec.expr_const_operands;
8933 /* Add the storage class specifier or function specifier SCSPEC to the
8934 declaration specifiers SPECS, returning SPECS. */
8936 struct c_declspecs *
8937 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
8940 enum c_storage_class n = csc_none;
8942 specs->declspecs_seen_p = true;
8943 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
8944 && C_IS_RESERVED_WORD (scspec));
8945 i = C_RID_CODE (scspec);
8946 if (specs->non_sc_seen_p)
8947 warning (OPT_Wold_style_declaration,
8948 "%qE is not at beginning of declaration", scspec);
8952 /* C99 permits duplicate inline. Although of doubtful utility,
8953 it seems simplest to permit it in gnu89 mode as well, as
8954 there is also little utility in maintaining this as a
8955 difference between gnu89 and C99 inline. */
8957 specs->inline_p = true;
8960 dupe = specs->thread_p;
8961 if (specs->storage_class == csc_auto)
8962 error ("%<__thread%> used with %<auto%>");
8963 else if (specs->storage_class == csc_register)
8964 error ("%<__thread%> used with %<register%>");
8965 else if (specs->storage_class == csc_typedef)
8966 error ("%<__thread%> used with %<typedef%>");
8968 specs->thread_p = true;
8975 /* Diagnose "__thread extern". */
8976 if (specs->thread_p)
8977 error ("%<__thread%> before %<extern%>");
8984 /* Diagnose "__thread static". */
8985 if (specs->thread_p)
8986 error ("%<__thread%> before %<static%>");
8994 if (n != csc_none && n == specs->storage_class)
8997 error ("duplicate %qE", scspec);
9000 if (specs->storage_class != csc_none && n != specs->storage_class)
9002 error ("multiple storage classes in declaration specifiers");
9006 specs->storage_class = n;
9007 if (n != csc_extern && n != csc_static && specs->thread_p)
9009 error ("%<__thread%> used with %qE", scspec);
9010 specs->thread_p = false;
9017 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9020 struct c_declspecs *
9021 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
9023 specs->attrs = chainon (attrs, specs->attrs);
9024 specs->declspecs_seen_p = true;
9028 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9029 specifiers with any other type specifier to determine the resulting
9030 type. This is where ISO C checks on complex types are made, since
9031 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9034 struct c_declspecs *
9035 finish_declspecs (struct c_declspecs *specs)
9037 /* If a type was specified as a whole, we have no modifiers and are
9039 if (specs->type != NULL_TREE)
9041 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9042 && !specs->signed_p && !specs->unsigned_p
9043 && !specs->complex_p);
9047 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9048 has been specified, treat it as "int" unless "_Complex" is
9049 present and there are no other specifiers. If we just have
9050 "_Complex", it is equivalent to "_Complex double", but e.g.
9051 "_Complex short" is equivalent to "_Complex short int". */
9052 if (specs->typespec_word == cts_none)
9054 if (specs->saturating_p)
9056 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9057 if (!targetm.fixed_point_supported_p ())
9058 error ("fixed-point types not supported for this target");
9059 specs->typespec_word = cts_fract;
9061 else if (specs->long_p || specs->short_p
9062 || specs->signed_p || specs->unsigned_p)
9064 specs->typespec_word = cts_int;
9066 else if (specs->complex_p)
9068 specs->typespec_word = cts_double;
9069 pedwarn (input_location, OPT_pedantic,
9070 "ISO C does not support plain %<complex%> meaning "
9071 "%<double complex%>");
9075 specs->typespec_word = cts_int;
9076 specs->default_int_p = true;
9077 /* We don't diagnose this here because grokdeclarator will
9078 give more specific diagnostics according to whether it is
9079 a function definition. */
9083 /* If "signed" was specified, record this to distinguish "int" and
9084 "signed int" in the case of a bit-field with
9085 -funsigned-bitfields. */
9086 specs->explicit_signed_p = specs->signed_p;
9088 /* Now compute the actual type. */
9089 switch (specs->typespec_word)
9092 gcc_assert (!specs->long_p && !specs->short_p
9093 && !specs->signed_p && !specs->unsigned_p
9094 && !specs->complex_p);
9095 specs->type = void_type_node;
9098 gcc_assert (!specs->long_p && !specs->short_p
9099 && !specs->signed_p && !specs->unsigned_p
9100 && !specs->complex_p);
9101 specs->type = boolean_type_node;
9104 gcc_assert (!specs->long_p && !specs->short_p);
9105 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9106 if (specs->signed_p)
9107 specs->type = signed_char_type_node;
9108 else if (specs->unsigned_p)
9109 specs->type = unsigned_char_type_node;
9111 specs->type = char_type_node;
9112 if (specs->complex_p)
9114 pedwarn (input_location, OPT_pedantic,
9115 "ISO C does not support complex integer types");
9116 specs->type = build_complex_type (specs->type);
9120 gcc_assert (!(specs->long_p && specs->short_p));
9121 gcc_assert (!(specs->signed_p && specs->unsigned_p));
9122 if (specs->long_long_p)
9123 specs->type = (specs->unsigned_p
9124 ? long_long_unsigned_type_node
9125 : long_long_integer_type_node);
9126 else if (specs->long_p)
9127 specs->type = (specs->unsigned_p
9128 ? long_unsigned_type_node
9129 : long_integer_type_node);
9130 else if (specs->short_p)
9131 specs->type = (specs->unsigned_p
9132 ? short_unsigned_type_node
9133 : short_integer_type_node);
9135 specs->type = (specs->unsigned_p
9136 ? unsigned_type_node
9137 : integer_type_node);
9138 if (specs->complex_p)
9140 pedwarn (input_location, OPT_pedantic,
9141 "ISO C does not support complex integer types");
9142 specs->type = build_complex_type (specs->type);
9146 gcc_assert (!specs->long_p && !specs->short_p
9147 && !specs->signed_p && !specs->unsigned_p);
9148 specs->type = (specs->complex_p
9149 ? complex_float_type_node
9153 gcc_assert (!specs->long_long_p && !specs->short_p
9154 && !specs->signed_p && !specs->unsigned_p);
9157 specs->type = (specs->complex_p
9158 ? complex_long_double_type_node
9159 : long_double_type_node);
9163 specs->type = (specs->complex_p
9164 ? complex_double_type_node
9165 : double_type_node);
9171 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
9172 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
9173 if (specs->typespec_word == cts_dfloat32)
9174 specs->type = dfloat32_type_node;
9175 else if (specs->typespec_word == cts_dfloat64)
9176 specs->type = dfloat64_type_node;
9178 specs->type = dfloat128_type_node;
9181 gcc_assert (!specs->complex_p);
9182 if (!targetm.fixed_point_supported_p ())
9183 specs->type = integer_type_node;
9184 else if (specs->saturating_p)
9186 if (specs->long_long_p)
9187 specs->type = specs->unsigned_p
9188 ? sat_unsigned_long_long_fract_type_node
9189 : sat_long_long_fract_type_node;
9190 else if (specs->long_p)
9191 specs->type = specs->unsigned_p
9192 ? sat_unsigned_long_fract_type_node
9193 : sat_long_fract_type_node;
9194 else if (specs->short_p)
9195 specs->type = specs->unsigned_p
9196 ? sat_unsigned_short_fract_type_node
9197 : sat_short_fract_type_node;
9199 specs->type = specs->unsigned_p
9200 ? sat_unsigned_fract_type_node
9201 : sat_fract_type_node;
9205 if (specs->long_long_p)
9206 specs->type = specs->unsigned_p
9207 ? unsigned_long_long_fract_type_node
9208 : long_long_fract_type_node;
9209 else if (specs->long_p)
9210 specs->type = specs->unsigned_p
9211 ? unsigned_long_fract_type_node
9212 : long_fract_type_node;
9213 else if (specs->short_p)
9214 specs->type = specs->unsigned_p
9215 ? unsigned_short_fract_type_node
9216 : short_fract_type_node;
9218 specs->type = specs->unsigned_p
9219 ? unsigned_fract_type_node
9224 gcc_assert (!specs->complex_p);
9225 if (!targetm.fixed_point_supported_p ())
9226 specs->type = integer_type_node;
9227 else if (specs->saturating_p)
9229 if (specs->long_long_p)
9230 specs->type = specs->unsigned_p
9231 ? sat_unsigned_long_long_accum_type_node
9232 : sat_long_long_accum_type_node;
9233 else if (specs->long_p)
9234 specs->type = specs->unsigned_p
9235 ? sat_unsigned_long_accum_type_node
9236 : sat_long_accum_type_node;
9237 else if (specs->short_p)
9238 specs->type = specs->unsigned_p
9239 ? sat_unsigned_short_accum_type_node
9240 : sat_short_accum_type_node;
9242 specs->type = specs->unsigned_p
9243 ? sat_unsigned_accum_type_node
9244 : sat_accum_type_node;
9248 if (specs->long_long_p)
9249 specs->type = specs->unsigned_p
9250 ? unsigned_long_long_accum_type_node
9251 : long_long_accum_type_node;
9252 else if (specs->long_p)
9253 specs->type = specs->unsigned_p
9254 ? unsigned_long_accum_type_node
9255 : long_accum_type_node;
9256 else if (specs->short_p)
9257 specs->type = specs->unsigned_p
9258 ? unsigned_short_accum_type_node
9259 : short_accum_type_node;
9261 specs->type = specs->unsigned_p
9262 ? unsigned_accum_type_node
9273 /* A subroutine of c_write_global_declarations. Perform final processing
9274 on one file scope's declarations (or the external scope's declarations),
9278 c_write_global_declarations_1 (tree globals)
9283 /* Process the decls in the order they were written. */
9284 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9286 /* Check for used but undefined static functions using the C
9287 standard's definition of "used", and set TREE_NO_WARNING so
9288 that check_global_declarations doesn't repeat the check. */
9289 if (TREE_CODE (decl) == FUNCTION_DECL
9290 && DECL_INITIAL (decl) == 0
9291 && DECL_EXTERNAL (decl)
9292 && !TREE_PUBLIC (decl)
9293 && C_DECL_USED (decl))
9295 pedwarn (input_location, 0, "%q+F used but never defined", decl);
9296 TREE_NO_WARNING (decl) = 1;
9299 wrapup_global_declaration_1 (decl);
9305 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9306 reconsider |= wrapup_global_declaration_2 (decl);
9310 for (decl = globals; decl; decl = TREE_CHAIN (decl))
9311 check_global_declaration_1 (decl);
9314 /* A subroutine of c_write_global_declarations Emit debug information for each
9315 of the declarations in GLOBALS. */
9318 c_write_global_declarations_2 (tree globals)
9322 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
9323 debug_hooks->global_decl (decl);
9326 /* Preserve the external declarations scope across a garbage collect. */
9327 static GTY(()) tree ext_block;
9330 c_write_global_declarations (void)
9334 /* We don't want to do this if generating a PCH. */
9338 /* Don't waste time on further processing if -fsyntax-only.
9339 Continue for warning and errors issued during lowering though. */
9340 if (flag_syntax_only)
9343 /* Close the external scope. */
9344 ext_block = pop_scope ();
9346 gcc_assert (!current_scope);
9350 tree tmp = BLOCK_VARS (ext_block);
9352 FILE * stream = dump_begin (TDI_tu, &flags);
9355 dump_node (tmp, flags & ~TDF_SLIM, stream);
9356 dump_end (TDI_tu, stream);
9360 /* Process all file scopes in this compilation, and the external_scope,
9361 through wrapup_global_declarations and check_global_declarations. */
9362 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9363 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
9364 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
9366 /* We're done parsing; proceed to optimize and emit assembly.
9367 FIXME: shouldn't be the front end's responsibility to call this. */
9368 cgraph_finalize_compilation_unit ();
9370 /* After cgraph has had a chance to emit everything that's going to
9371 be emitted, output debug information for globals. */
9372 if (errorcount == 0 && sorrycount == 0)
9374 timevar_push (TV_SYMOUT);
9375 for (t = all_translation_units; t; t = TREE_CHAIN (t))
9376 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
9377 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
9378 timevar_pop (TV_SYMOUT);
9384 #include "gt-c-decl.h"